Magnetic stirrer and stirring system including the same

Abstract

The present invention relates to a magnetic stirrer and a stirring system including the magnetic stirrer. When configuring a large-scale stirring system having an impeller shaft, the magnetic stirrer can minimize the mixing of foreign substances generated by the components of the magnetic stirrer in the liquid to be stirred, has a simple structure for cleaning the structure supporting the impeller shaft, and can ensure sufficient output.

Description

Technical Field

[0001] The present invention relates to a magnetic stirrer and a liquid stirring system. More specifically, the present invention relates to a magnetic stirrer and a stirring system including the magnetic stirrer, which, when configuring a large-scale stirring system having an impeller shaft, can minimize the mixing of foreign substances generated by the components of the magnetic stirrer in the liquid to be stirred, has a simple structure for cleaning the structure supporting the impeller shaft, and can ensure sufficient output. Background Art

[0002] A stirring system is a system for stirring liquids with liquids, liquids with solids, particulate materials, etc. Such stirring systems are widely used in various industrial fields. In the pharmaceutical, biological, food, cosmetic, and fine chemical industries, there is a great demand for stirrers that can prevent the generation and infiltration of foreign substances and can be hygienically managed.

[0003] Stirring systems can be classified according to whether the actuator installed on the stirring tank includes an impeller shaft for driving the impeller. In the case of a small-scale stirring system, a permanent magnet can be embedded in the impeller, and a magnetic rotor connected to the drive motor is provided inside the impeller. Therefore, in a stirring system equipped with a magnetic stirrer without an impeller shaft, the driving force loss is small and sufficient RPM can be ensured, but it is not easy to mix uniformly in the stirring tank. Therefore, a large-scale stirring system cannot be built.

[0004] Therefore, a structure in which the drive motor is mainly installed outside the stirring tank and the impeller shaft equipped with multiple impellers is installed inside the stirring tank is usually mainly used to configure a large-scale stirring system.

[0005] In particular, in a stirring system for stirring pharmaceuticals, biologicals, or fine chemicals among large-scale stirring systems, foreign substances outside the stirring tank should not be mixed into the liquid to be stirred. Therefore, a stirrer that uses a sealing technique that separates the inside and outside of the stirring tank through a mechanical seal is used.

[0006] Mechanical seals have various hygiene or maintenance problems, such as the generation of foreign substances due to the deterioration of materials adsorbed or fixed near the mechanical seal during stirring, or due to the damage of the mechanical seal, the low durability of the mechanical seal, etc.

[0007] To prevent this problem, magnetic stirring technology has been introduced, whereby even in a large-scale stirring system applying an impeller shaft, the driving force is transmitted through magnetic coupling between magnetic units.

[0008] A magnetic stirrer for configuring an impeller shaft of a large-scale stirring system includes a structure for supporting the impeller shaft within a stirring tank. Therefore, structures for minimizing the generation of foreign matter in the structure for supporting the impeller shaft, a simple cleaning structure for cleaning the generated foreign matter, and ensuring sufficient output of the magnetic stirrer are important issues. Summary of the Invention

[0009] The present invention aims to provide a magnetic stirrer and a stirring system including the magnetic stirrer. When configuring a large-scale stirring system having an impeller shaft, the magnetic stirrer can minimize the mixing of foreign matter generated by components of the magnetic stirrer in the liquid to be stirred, has a simple structure for cleaning the structure supporting the impeller shaft, and can ensure sufficient output.

[0010] According to an aspect of the present invention, the above and other objects can be achieved by providing a magnetic stirrer mounted on a stirring tank containing a liquid to be stirred. The magnetic stirrer includes: a drive motor mounted outside the stirring tank; a drive shaft driven by the drive motor; a first magnetic unit provided at one end of the drive shaft and including a plurality of magnetic bodies; a top plate including a tank mounting portion mounted in the stirring tank through a mounting hole in the stirring tank, a first magnetic unit receiving portion for rotatably receiving the first magnetic unit therein, and a support shaft extending below the first magnetic unit receiving portion; a drive member mounted inside the stirring tank so as to be rotatable around the outside of the top plate, the drive member including a second magnetic unit provided at the same height as the first magnetic unit; and an impeller shaft connected to the bottom of the drive member and including at least one impeller.

[0011] Moreover, the drive member may include: a second magnetic unit embedding portion into which the second magnetic unit is embedded; a shaft through portion connected to the bottom of the second magnetic unit embedding portion and through which the support shaft of the top plate passes; and an impeller shaft connection portion provided below the shaft through portion and connected to the impeller shaft.

[0012] Moreover, bearing mounting holes each having an enlarged inner diameter may be provided at the top and bottom of the shaft through portion of the drive member to mount bearings, and the shaft through portion of the drive member and the support shaft of the top plate may be supported by the bearings mounted in the bearing mounting holes so as to be rotatable relative to each other.

[0013] Moreover, in a state where the bearing is installed in the bearing mounting hole at the bottom of the shaft through portion, a bearing bolt for supporting the drive member below may be fastened to the support shaft of the top plate to prevent the bearing from separating.

[0014] Further, the bearing bolt may include a flange for supporting the bearing and preventing foreign matter from falling between the shaft through portion of the main body of the impeller and the support shaft of the top plate.

[0015] Further, a foreign matter collection groove may be formed on the upper surface of the flange of the bearing bolt.

[0016] Further, the shaft connection portion of the driving member and the upper end of the impeller shaft may be provided in the form of a flange and fastened together by a fastening member.

[0017] Further, the driving member may include a washing water inlet for introducing washing water.

[0018] Further, the first magnetic force unit or the second magnetic force unit may include: a tubular main body having a shaft hole for installing the driving shaft or an opening of the first magnetic force unit accommodation portion for setting the top plate at its center; and a plurality of permanent magnets having different polarities, which are alternately arranged at a certain interval on the outer peripheral surface or the inner peripheral surface of the tubular main body.

[0019] Further, the tubular main body may be formed of a super-permeable magnetic alloy or a high-permeability magnetic alloy material.

[0020] Further, the tubular main body may be formed of an alloy material containing 70% by weight or more of nickel.

[0021] Further, the plurality of permanent magnets of the first magnetic force unit or the second magnetic force unit may be separated from each other, and at least some of the plurality of permanent magnets may be embedded in the tubular main body.

[0022] Further, the tubular main body may be configured by stacking annular plates each including a plurality of grooves.

[0023] Further, a plurality of impellers may be provided on the impeller shaft at intervals.

[0024] Further, the magnetic stirrer may further include a speed reducer connecting the driving motor and the driving shaft, and the motor shaft of the driving motor may be connected to the speed reducer in the horizontal direction.

[0025] According to an aspect of the present invention, the above and other objects may be achieved by providing a stirring system including the magnetic stirrer of the present invention; and a stirring tank containing a liquid or particulate material to be stirred, wherein the stirring tank includes: a mounting hole in which the tank mounting portion of the top plate of the magnetic stirrer is mounted; a pipe connection hole to be connected to a washing water pipe for supplying washing water; and a spray ball having a plurality of spray holes for spraying washing water into the stirring tank.

[0026] Further, the spraying ball can be arranged at a height corresponding to the driving member of the magnetic stirrer. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a perspective view of a liquid stirring system according to the present invention;

[0028] Figure 2 is Figure 1 a front perspective view of the liquid stirring system;

[0029] Figure 3 is a magnetic stirrer installed on the liquid stirring system according to the present invention and Figure 1 and Figure 2 a perspective view and a side view of the magnetic stirrer on the liquid stirring system;

[0030] Figure 4 is an exploded perspective view of the liquid stirring system according to the present invention;

[0031] Figure 5 is Figure 3 a cross-sectional view of the magnetic stirrer;

[0032] Figure 6 shows the coupling relationship between the first magnetic unit and the second magnetic unit of the magnetic stirrer according to the present invention;

[0033] Figure 7 shows the magnetic cores of the first magnetic unit and the second magnetic unit of the magnetic stirrer according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0034] Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited thereto and can be implemented in different forms. On the contrary, the embodiments provided herein are only for making the present disclosure complete and comprehensive, and for fully conveying the scope of the present invention to those skilled in the art. Throughout the specification, the same reference numerals denote the same elements.

[0035] Figure 1 is a perspective view of a liquid stirring system 1000 according to the present invention. Figure 2 is Figure 1 a front perspective view of the liquid stirring system 1000.

[0036] The present invention relates to a liquid stirring system 1000 for stirring liquids in the fields of pharmaceuticals, biology, food, cosmetics, and fine chemicals. More specifically, the present invention relates to a magnetic stirrer and a liquid stirring system 1000 including the magnetic stirrer, which minimize the generation of foreign substances in the stirring tank 900 and maximize the output of the magnetic stirrer.

[0037] As Figure 1As shown, the present invention may include a stirring tank 900, a magnetic stirrer 1 installed on the stirring tank 900 and to be described below, and a washing water pipe lp installed inside the magnetic stirrer 1 and configured to supply washing water to at least one spray ball 950. The spray ball 950 includes a plurality of spray holes for spraying washing water.

[0038] The stirring tank 900 may include a plurality of support frames 970 and be configured in a cylindrical chamber shape.

[0039] An installation hole 910 for installing the magnetic stirrer 1 and a pipe connection portion 930 to be connected to the washing water pipe lp may be provided on the upper surface of the stirring tank 900, and the pipe connection portion 930 may be connected to the spray ball 950.

[0040] The spray ball 950 may be provided in a spherical shape or in the form of a ball, have a plurality of spray holes for spraying washing water in all directions, and be configured to clean the inner peripheral surfaces of the magnetic stirrer 1 and the stirring tank 900 with the washing water supplied through the washing water pipe lp after the stirring process is completed, thereby simplifying the cleaning structure.

[0041] As Figure 2 shown, the spray ball 950 may be provided at a height corresponding to the driving member 600 of the magnetic stirrer 1. As described below, the driving member 600 is a structure including a support shaft 450 provided with a top plate 400 and a bearing b, and thus foreign matters may be generated or accumulated due to continuous friction. Therefore, it may be provided at a height where the washing water sprayed by the spray ball 950 can be easily supplied to the driving member 600. The method of cleaning the inside of the driving member 600 with washing water will be described again below.

[0042] Figure 3 is a three-dimensional view and a side view of the magnetic stirrer 1 installed on the Figure 1 and Figure 2 liquid stirring system 1000 according to the present invention. Figure 4 is an exploded three-dimensional view of the liquid stirring system 1000 according to the present invention. Figure 5 is Figure 3 a cross-sectional view of the magnetic stirrer 1.

[0043] As described above, the magnetic stirrer 1 according to the present invention may have a structure in which an impeller shaft 700 provided with impellers 800a and 800b is placed inside the stirring tank 900 through an installation hole 910 in the upper surface of the stirring tank 900, and a speed reducer 110 and a driving motor 100 are provided on the stirring tank 900.

[0044] The magnetic stirrer 1 according to the present invention may include: a drive motor 100 installed outside the stirring tank 900; a drive shaft 130 driven by the drive motor 100; a first magnetic unit 300 provided at one end of the drive shaft 130 and including a plurality of magnetic bodies; a top plate 400 including a tank mounting portion installed inside the stirring tank 900 through a mounting hole 910 of the stirring tank 900, a first magnetic unit accommodating portion 430 in which the first magnetic unit 300 is rotatably accommodated, and a support shaft 450 extending below the first magnetic unit accommodating portion 430; a drive member 600 installed inside the stirring tank 900 so as to be rotatable around the outside of the top plate 400, and the drive member includes a second magnetic unit 500 provided at the same height as the first magnetic unit 300; and an impeller shaft 700 connected to the bottom of the drive member 600 and including at least one impeller, such as impellers 800a and 800b.

[0045] The motor shaft of the drive motor 100 may be provided in the horizontal direction, and the drive motor 100 may be connected to a speed reducer 110 for torque amplification and speed reduction.

[0046] The drive shaft 130 may be vertically installed downward from the speed reducer 110, and the first magnetic unit 300 may be installed below the drive shaft 130.

[0047] The speed reducer 110 may be installed on the stirring tank 900, and a housing 200 may be installed on the stirring tank 900 to protect the drive shaft 130.

[0048] The housing 200 may be configured as a cylindrical tube, and fastening flanges may be provided to install the speed reducer 110 and the top plate 400 at the top and bottom of the housing 200, respectively.

[0049] The top plate 400 may be installed below the housing 200. The top plate 400 may allow the first magnetic unit 300 installed as a rotor on the drive shaft 130 to be rotatably provided inside the stirring tank 900, and support the rotation of the drive member 600 in which the second magnetic unit 500 is embedded at a height corresponding to the first magnetic unit 300.

[0050] The top plate 400 may include a tank mounting portion installed on the stirring tank 900 through the mounting hole 910 of the stirring tank 900, a first magnetic unit accommodating portion 430 in which the first magnetic unit 300 is rotatably accommodated, and a support shaft 450 extending below the first magnetic unit accommodating portion 430. The tank mounting portion, the first magnetic unit accommodating portion, and the support shaft 450 may have a circular cross-section, and their outer diameters decrease in order to form a multi-stage shape.

[0051] In the top plate 400 below the outer shell 200, a tank mounting portion including an upper flange can be inserted between the outer shell 200 and the mounting hole 910 of the stirring tank 900 to fasten the outer shell 200, the top plate 400, and the stirring tank 900 together.

[0052] The first magnetic force unit accommodating portion 430 is used to accommodate the first magnetic force unit 300 mounted at the bottom of the drive shaft 130 connected to the speed reducer 110, so that the first magnetic force unit 300 can rotate when the drive motor 100 rotates, and keeps a non-contact state with the inner peripheral surface of the first magnetic force unit accommodating portion 430 of the top plate 400 and the outer peripheral surface of the first magnetic force unit 300.

[0053] The support shaft 450 is arranged below the first magnetic force unit accommodating portion 430 to support the drive member 600 so that it can rotate, which will be described below.

[0054] The drive member 600 can be installed to be able to rotate around the outside of the first magnetic force unit accommodating portion 430 of the top plate 400 and the support shaft 450 inside the stirring tank 900. The drive member 600 is used to rotate the impeller shaft 700 provided with impellers 800a and 800b and included in the stirring tank 900 when the drive motor 100 is driven.

[0055] Therefore, the second magnetic force unit 500 magnetically coupled with the first magnetic force unit 300 accommodated in the first magnetic force unit accommodating portion 430 of the top plate 400 can be arranged on the drive member 600.

[0056] Specifically, in the drive member 600, it can include, along the downward direction: a second magnetic force unit embedding portion 610, in which the second magnetic force unit 500 is embedded; a shaft passing portion 630, which is connected to the bottom of the second magnetic force unit embedding portion 610 and is passed through by the support shaft 450 of the top plate 400; and a shaft connection portion 650, which is arranged below the shaft passing portion 630 and is connected to the impeller shaft 700.

[0057] The top plate 400 can be fixed to the stirring tank 900, and the support shaft 450 below the first magnetic force unit accommodating portion 430 can be used as the shaft for supporting the rotation of the drive member 600.

[0058] The drive member 600 can include: a second magnetic force unit embedding portion 610, in which the second magnetic force unit 500 is embedded; a shaft passing portion 630, which is connected to the bottom of the second magnetic force unit embedding portion 610 and is passed through by the support shaft 450 of the top plate 400; and a shaft connection portion 650, which is arranged below the shaft passing portion 630 and is connected to the impeller shaft 700.

[0059] The drive member 600 can be integrally tubular, with the second magnetic force unit 500 embedded in its upper part and a shaft connection portion 650 for fixing the impeller shaft 700 arranged in its lower part.

[0060] The top plate 400 is fixed to the stirring tank 900, and the driving member 600 can rotate while being connected to the impeller shaft 700. Therefore, at least one bearing b can be installed between the top plate 400 and the driving member 600.

[0061] For this purpose, as Figure 5 shown, bearing mounting holes with an enlarged inner diameter can be provided at the top and bottom of the shaft through portion 630 of the driving member 600 to install the bearing b, and the shaft through portion 630 of the driving member 600 and the support shaft 450 of the top plate 400 can be supported by the bearing b so as to be rotatable relative to each other.

[0062] Specifically, the inner ring of each bearing b can be installed on the support shaft 450 of the top plate 400, and thus the outer ring can be installed on the inner peripheral surface of the shaft through portion 630 of the driving member 600, that is, the inner peripheral surface of the shaft mounting hole, thereby providing a structure that allows the driving member 600 to rotate.

[0063] Figure 5 Bearing mounting holes for installing two bearings b are shown at the top and bottom of the shaft through portion 630 of the driving member 600, but the number of bearings b can be increased or decreased.

[0064] In a state where the bearing b is installed in the bearing mounting hole below the shaft through portion 630, the bearing bolt 170 can be fastened to the support shaft 450 of the top plate 400 to prevent the bearing b from separating.

[0065] The driving member 600 is rotatably mounted on the support shaft 450 of the top plate 400 through the bearing b, but since there is no separate lower support structure, the bearing bolt 170 supports the driving member 600 below.

[0066] That is to say, the bearing bolt 170 can include a flange 171 for supporting the bearing b.

[0067] As Figure 5 shown in the enlarged view, the flange 171 is an area that expands and widens from the head of the bearing bolt 170, and can provide a structure for supporting the driving member 600 below by supporting the bottom surface of the bearing b installed in the bearing mounting hole below the shaft mounting portion 630 of the driving member 600.

[0068] The flange 171 of the bearing bolt 170 can provide a function of preventing foreign matters from falling into the stirring tank 900 due to friction or wear of the bearing b or the like, and provide a structure for supporting the bearing b or the driving member 600 below.

[0069] That is to say, the inner peripheral surface of the flange 171 can provide the function of collecting foreign matters while horizontally supporting the bottom surface of the bearing b. A collecting groove 173 or the like for collecting foreign matters can be formed on the inner peripheral surface of the flange 171 to enhance the function of collecting foreign matters.

[0070] The shaft connecting portion 650 can be provided in the form of a flange below the shaft passing portion 630 of the driving member 600. The shaft connecting portion 650 of the driving member 600 and the upper end 750 of the impeller shaft 700 can be configured in the form of flanges and fastened together by fastening members so that the impeller shaft 700 can rotate during the rotation of the driving member 600.

[0071] When the stirring process is completed, it is necessary to clean the inside of the stirring tank 900. Therefore, washing water can be sprayed from the spray ball 950 to clean the inner peripheral surface of the stirring tank 900 and the inside of the driving member 600.

[0072] For this purpose, at least one of the second magnetic unit embedding portion 610, the shaft passing portion 630, and the shaft connecting portion 650 of the driving member 600 can include a washing water inlet into which the washing water sprayed by the spray ball 950 can flow.

[0073] As Figure 2 As shown, since the spray ball 950 sprays washing water in all directions, the sprayed washing water can flow through the gap between the second magnetic unit embedding portion 610 of the driving member 600 and the first magnetic unit accommodating portion 430 of the top plate 400, or through the washing water inlet of the shaft passing portion 630 of the driving member 600, so as to clean the foreign matters on the bearing or similar elements between the shaft passing portion 630 of the driving member 600 and the shaft support of the top plate 400.

[0074] A washing water outlet can be provided in the flange at the upper part of the impeller shaft 700 to easily discharge the washing water after cleaning the bearing b or similar elements between the shaft passing portion 630 of the driving member 600 and the shaft support of the top plate 400.

[0075] At least one impeller can be provided on the impeller shaft 700 at intervals. Moreover, a plurality of impellers can be provided on the impeller shaft 700 at intervals according to the capacity of the stirring tank 900 or the like. The shapes and types of the plurality of impellers can vary according to the type of the target liquid or particulate material contained in the stirring tank 900 or the height of the impeller shaft.

[0076] When the plurality of impellers are spaced apart from each other, all the target liquid contained in the stirring tank 900 can be stirred.

[0077] As Figure 4As shown, the magnetic stirrer 1 with the above structure can be installed in the stirring tank 900 divided into a lid and a main body. The outer shell 200 and the top plate 400 can be installed on the lid of the stirring tank 900, and the drive shaft 130 equipped with the first magnetic unit 300 can be installed downward from the top of the top plate 400. The drive shaft 130 can be installed on the speed reducer 110, and the drive motor 100 can be installed in the lateral direction of the speed reducer 110.

[0078] When the support shaft 450 of the top plate 400 exposed below the lid of the stirring tank 900 is set downward, the drive member 600, the bearing b, etc. can be installed, and the bearing bolt 170 can be fastened to the support shaft 450 of the top plate 400 so that the bearing b between the shaft through portion 630 of the drive member 600 and the support shaft 450 of the top plate 400 can be supported by the bearing bolt 170 to support the drive member 600 below.

[0079] In addition, the impeller shaft 700 can be fixed to the shaft connection portion at the lower end of the drive member 600, thus completing the assembly of the magnetic stirrer 1.

[0080] In the magnetic stirrer 1, when the drive motor 100 rotates, the driving force can be transmitted to the drive shaft 130 and the first magnetic unit 300 via the speed reducer 110, and the second magnetic unit 500 embedded in the second magnetic unit embedding portion 610 of the drive member 600 can be driven to be magnetically coupled to the first magnetic unit 300, thereby rotating the drive member 600 and the impeller shaft 700 fixed to the drive member 600.

[0081] In the stirring system 1000 which is a large system including the impeller shaft 700, the impeller shaft 700 is set very long in the stirring tank 900, and a plurality of impellers are arranged at intervals to uniformly stir the liquid to be stirred. However, the driving force is transmitted via magnetic coupling, and thus the output of the stirrer is limited.

[0082] Figure 6 The coupling relationship between the first magnetic unit 300 and the second magnetic unit 500 of the magnetic stirrer 1 according to the present invention is shown. Figure 7 The magnetic cores of the first magnetic unit 300 and the second magnetic unit 500 of the magnetic stirrer 1 according to the present invention are shown.

[0083] Figure 6 The shown first magnetic unit 300 can be installed at the bottom of the drive shaft 130, and the second magnetic unit 500 can be embedded in the second magnetic unit embedding portion 610 on the drive member 600.

[0084] The first magnetic force unit 300 may include: a tubular body 330 having a shaft hole 350 at its center in which the drive shaft 130 is installed; a plurality of permanent magnets 310 embedded in the outer peripheral surface of the tubular body 330 such that the permanent magnets 310 having different polarities are alternately arranged at regular intervals; and a metal protective layer 370 (see Figure 6 ), which surrounds the outside of the tubular body 330 and the plurality of permanent magnets 310.

[0085] Although Figure 6 not shown, the first magnetic force unit 300 can rotate together with the rotation of the drive shaft 130 while being accommodated in the first magnetic force unit accommodation part 430 of the top plate 400.

[0086] The metal protective layer 370 can form the outer peripheral surface of the first magnetic force unit 300 and can integrally end at the boundary of the drive shaft 130 with the first magnetic force unit 300 so that the permanent magnets 310 are not exposed to the outside. The metal protective layer can be formed of, for example, a thin metal tube or by metal coating.

[0087] The metal protective layer 370 can be formed to a thickness thin enough to prevent the magnetic force attenuation of the permanent magnets 310 of the first magnetic force unit 300.

[0088] Similarly, the second magnetic force unit 500 includes: a tubular body 530 having an opening 550 in which the first magnetic force unit accommodation part 430 of the top plate 400 is rotatably provided; and a plurality of permanent magnets 510 embedded in the inner peripheral surface of the tubular body 530 such that the permanent magnets 510 having different polarities are alternately arranged at intervals. The second magnetic force unit 500 is embedded in the second magnetic force unit embedding part 610 of the drive member 600, and thus the second magnetic force unit embedding part 610 of the drive member 600 can serve as a metal protective layer.

[0089] When the permanent magnets 310 of the first magnetic force unit 300 rotate, the permanent magnets 510 of the second magnetic force unit 500 are magnetically coupled to the permanent magnets 310 according to the polarities of the permanent magnets 310 and rotate together with the permanent magnets 310, thereby stirring the target liquid contained in the stirring tank 900.

[0090] According to the present invention, a structure is applied that allows the magnetic forces of the permanent magnets 310 and 510 of the first magnetic force unit 300 and the second magnetic force unit 500 to be used as much as possible for magnetic coupling between the first magnetic force unit 300 and the second magnetic force unit 500 to solve the output problem of the magnetic stirrer 1.

[0091] As Figure 7 shown, the magnetic coupling directions of the first magnetic force unit 300 and the second magnetic force unit 500 are different, that is, the outer peripheral direction and the inner peripheral direction, respectively.

[0092] That is to say, the magnetic force of the permanent magnet 310 of the first magnetic force unit 300 should be transmitted along the outer peripheral direction, and the magnetic force of the permanent magnet 510 of the second magnetic force unit 500 should be transmitted along the inner peripheral direction. Therefore, the permanent magnets 310 and 510 of the first magnetic force unit 300 and the second magnetic force unit 500 can be coupled to each other through their magnetic forces to transmit the driving torque.

[0093] Therefore, the first magnetic force unit 300 can be installed such that a plurality of permanent magnets 310 with different polarities are alternately arranged on the outer peripheral surface of the tubular body 330, and the second magnetic force unit 500 can be installed such that a plurality of permanent magnets 510 with different polarities are alternately arranged on the inner peripheral surface of the tubular body 530.

[0094] As Figure 7 shown, an integrated body with long grooves for installing permanent magnets can be considered, such that the permanent magnets 310 and 510 of the first magnetic force unit 300 and the second magnetic force unit 500 can be installed or exposed at intervals on the outer peripheral surface or the inner peripheral surface of the body. However, methods such as precision machining or casting need to be applied, so the manufacturing process is difficult and expensive.

[0095] Therefore, in the present invention, the tubular bodies 330 and 530 of the first magnetic force unit 300 and the second magnetic force unit 500 can be configured by stacking annular plates 331 and 531 each including a plurality of grooves in the outer peripheral surface or the inner peripheral surface in the circumferential direction, such that the permanent magnets 310 and 510 can be installed at intervals from each other. The annular plates 331 and 531 each including a plurality of grooves can be easily configured by a method such as stamping, thereby reducing the manufacturing cost of the bodies 330 and 530.

[0096] After stacking the annular plates 331 and 531 each including a plurality of grooves, permanent magnets can be installed thereon to fix the annular plates 331 and 531 by using magnetic forces, without performing welding and without causing gaps or slots.

[0097] It can be assumed that the magnitude of the magnetic force or magnetic field emitted from the permanent magnet 310 or 510 of the first magnetic force unit 300 or the second magnetic force unit 500 of the magnetic stirrer 1 is constant. Therefore, considering the magnetic coupling directions of the first magnetic force unit 300 and the second magnetic force unit 500 respectively, the magnetic force or magnetic field of the first magnetic force unit 300 can be blocked in the inner peripheral direction, and the magnetic force or magnetic field of the second magnetic force unit 500 can be blocked in the outer peripheral direction, thereby maximizing the strength of the magnetic coupling.

[0098] Although when the thickness of the body except for the grooves or the annular plates constituting the body increases in the radial direction, the magnetic force or magnetic field can be naturally blocked, the increase in the weight of the magnetic force unit increases the load on the driving motor 100. Therefore, it is not advisable to increase the thickness of the body or the annular plates.

[0099] Therefore, as shown in Figure 7 FIGs. 7A and 7B, the first magnetic force unit 300 can be installed in a semi-embedded state such that the permanent magnet 310 is exposed in the outer peripheral direction of the main body 330. Therefore, the magnetic force or magnetic field can be completely transmitted in the magnetic coupling direction, and the magnetic force or magnetic field can be blocked due to the thickness of the main body 330 in the opposite direction (inner peripheral direction).

[0100] For the same reason, as shown in Figure 7 FIGs. 7C and 7D, the second magnetic force unit 300 can be installed in a semi-embedded state such that the permanent magnet 510 is exposed in the inner peripheral direction of the main body 530. Therefore, the magnetic force or magnetic field can be completely transmitted in the inner peripheral direction, and the magnetic force or magnetic field can be blocked due to the thickness of the main body 530 in the opposite direction (outer peripheral direction).

[0101] In addition, it has been found that it is meaningful for magnetic field shielding and magnetic field concentration when each of the main bodies 330 of the first magnetic force unit 300 and the main bodies 530 of the second magnetic force unit 500 is formed of a highly permeable metal having a magnetic shielding function, such as an alloy material containing 70% by weight or more of nickel.

[0102] For example, materials such as supermally (superpermeable magnetic alloy) having ultra-high permeability or mu-metal (alloy containing 75% nickel, 20% iron, and 5% copper), which is a highly permeable alloy, can be applied as examples of the highly permeable metal for forming the main bodies 310 and 510 of the first magnetic force unit 300 and the second magnetic force unit 500 or the annular plates 331 and 551 constituting the main bodies 310 and 510, but the embodiments are not limited thereto.

[0103] Supermally is a type of Mo-Ni-Fe alloy, which refers to a metal obtained through the following process: a non-metallic material obtained when 5% molybdenum permalloy (5% molybdenum, 79% nickel, and the rest iron) is dissolved in a vacuum without forced deoxidation and cast in helium or nitrogen without oxidation is heated to a high temperature, the non-metallic material is purified in a hydrogen atmosphere, and the resulting material is heat-treated under optimal heat treatment conditions.

[0104] As shown in Figure 7 , at least three surfaces of each permanent magnet are shielded by the main body of the magnetic force unit formed of this material. Therefore, the magnetic force or magnetic field of each permanent magnet is concentrated in the magnetic coupling direction, thereby minimizing the load on the drive motor 100 and increasing the stirring output of the drive motor 100 by at least 20% or more.

[0105] In addition, it has been found that when the main body grooves for installing the permanent magnets are used to shield the upper and lower surfaces of the permanent magnets, the stirring output of the drive motor 100 is increased by at least 30%.

[0106] In the magnetic stirrer 1 having the above-described configuration and the stirring system 1000 including the magnetic stirrer, although the drive shaft 130 extends into the stirring tank 900, the driving force can be transmitted between the shafts through magnetic coupling. Therefore, the magnetic seal for sealing the drive shaft 130 can be omitted, thereby minimizing the contamination in the fluid to be stirred due to the magnetic seal or the like. The spray ball 950 is provided near the drive member 600, and a cleaning path is provided inside the drive member 600 to clean the support shaft 450. Therefore, the inside of the stirring tank 900 and the inside of the drive member 600 can be cleaned with the washing water sprayed from the spray ball 950, and the pipe structure for cleaning can be minimized, thereby simplifying the system.

[0107] In addition, the main body of each magnetic unit can be formed of a metal having high permeability to maximize the output transmission efficiency of the drive motor 100, and the annular plates can be stacked to form the magnetic unit, thereby minimizing the manufacturing cost.

[0108] According to the magnetic stirrer of the present invention, although the drive motor is provided outside the stirring tank and the drive shaft extends into the stirring tank, the driving force can be transmitted between the shafts through magnetic coupling. Therefore, mechanical seals for sealing the drive shaft can be omitted, thereby minimizing the contamination in the fluid to be stirred due to mechanical seals or the like.

[0109] In addition, according to the magnetic stirrer of the present invention, a cleaning path is provided between the drive member that is rotationally driven by the drive torque transmitted through magnetic coupling and the support shaft. Therefore, the washing water sprayed from the spray ball inside the stirring tank can be used for cleaning, thereby simplifying the pipe structure for cleaning.

[0110] Although the present invention has been described with respect to exemplary embodiments, those skilled in the art should understand that various changes and modifications can be made without departing from the technical concept and scope of the present invention defined by the appended claims. Therefore, it is clear that all modifications are included within the technical scope of the present invention as long as they include the respective parts defined in the claims of the present invention.

Claims

1. A magnetic stirrer is installed on a stirring tank containing a liquid to be stirred and spraying washing water inside. The magnetic stirrer includes: A drive motor, which is installed outside the stirring tank; A drive shaft, which is driven by the drive motor; A first magnetic unit, which is arranged at one end of the drive shaft and includes a plurality of magnetic bodies; A top plate, which includes a tank mounting portion installed in the stirring tank through a mounting hole of the stirring tank, a first magnetic unit accommodating portion for rotatably accommodating the first magnetic unit therein, and a support shaft extending below the first magnetic unit accommodating portion; A drive member, which is installed inside the stirring tank so as to be able to rotate around the outside of the top plate. The drive member includes a second magnetic unit arranged at the same height as the first magnetic unit; And An impeller shaft, which is connected to the bottom of the drive member and includes at least one impeller, Wherein the drive member includes a washing water inlet for introducing washing water, and the washing water flowing in from the washing water inlet forms a cleaning path for washing the support shaft of the top plate inside the drive member, Below the drive member, there is a bearing bolt with a bearing installed thereon. The bearing bolt has a flange for supporting the bearing, and a foreign matter collection groove is formed on the upper surface of the flange to prevent foreign matter from falling between the drive member and the support shaft of the top plate.

2. The magnetic stirrer according to claim 1, wherein the drive member includes: A second magnetic unit embedding portion, into which the second magnetic unit is embedded; A shaft passing portion, which is connected to the bottom of the second magnetic unit embedding portion and through which the support shaft of the top plate passes; and An impeller shaft connection portion, which is arranged below the shaft passing portion and is connected to the impeller shaft.

3. The magnetic stirrer according to claim 2, wherein bearing mounting holes with enlarged inner diameters are provided at the top and bottom of the shaft passing portion of the drive member to install bearings, and the shaft passing portion of the drive member and the support shaft of the top plate are supported by the bearings installed in the bearing mounting holes so as to be able to rotate relative to each other.

4. The magnetic stirrer according to claim 3, wherein, In a state where the bearing is installed in the bearing mounting hole at the bottom of the shaft passing portion, the bearing bolt prevents the bearing from separating, and the bearing bolt is fastened to the support shaft of the top plate.

5. The magnetic stirrer according to claim 2, wherein the shaft connection portion of the drive member and the upper end of the impeller shaft are provided in the form of flanges and are fastened together by fastening members.

6. The magnetic stirrer according to claim 1, wherein the first magnetic unit or the second magnetic unit includes: A tubular body, which has a shaft hole for installing the drive shaft in the center or an opening for setting the first magnetic unit accommodating portion of the top plate therein; And A plurality of permanent magnets with different polarities, which are alternately arranged at a certain interval on the outer peripheral surface or the inner peripheral surface of the tubular body.

7. The magnetic stirrer according to claim 6, wherein the tubular body is formed of a super-permeable magnetic alloy or a high-permeability magnetic alloy material.

8. The magnetic stirrer according to claim 6, wherein the tubular body is formed of an alloy material containing 70% by weight or more of nickel.

9. The magnetic stirrer according to claim 6, wherein the plurality of permanent magnets of the first magnetic unit or the second magnetic unit are spaced apart from each other, and at least some of the plurality of permanent magnets are embedded in the tubular body.

10. The magnetic stirrer according to claim 9, wherein the tubular body is configured by stacking annular plates each including a plurality of grooves.

11. The magnetic stirrer according to claim 1, wherein a plurality of impellers are provided at intervals on the impeller shaft.

12. The magnetic stirrer according to claim 1, further comprising a speed reducer connecting the drive motor and the drive shaft, wherein the motor shaft of the drive motor is connected to the speed reducer in a horizontal direction.

13. A stirring system, comprising: The magnetic stirrer according to any one of claims 1 to 4, 7, 9 to 12; and A stirring tank containing a liquid or particulate material to be stirred, wherein the stirring tank includes: a mounting hole in which the tank mounting portion of the top plate of the magnetic stirrer is mounted; a pipe connection hole to which a washing water pipe for supplying washing water is to be connected; and a spray ball having a plurality of spray holes for spraying washing water into the stirring tank.

14. The stirring system according to claim 13, wherein the spray ball is provided at a height corresponding to the drive member of the magnetic stirrer.

Images