KR102769505B1 - Magnetic mixing device with improved coaxiality - Google Patents

Abstract

The present invention relates to a magnetic mixing device with improved coaxiality, and its purpose is to provide a magnetic mixing device with improved coaxiality, which prevents the rotational shaft from shaking or flowing and from bending deformation that occurs during rotation at a low cost by welding the rotational shaft to the impeller and then processing the rotational shaft so as to be coaxial. The magnetic mixing device comprises: a driving motor; a housing that accommodates an output shaft of the driving motor; a rotating rotor that protrudes from the upper portion of the housing and is coupled to the upper end of the output shaft, and is provided with a first permanent magnet; a welding portion that is coupled to a stirring vessel while rotatably accommodating the rotating rotor; an impeller portion that is coupled to the welding portion and is arranged inside the stirring vessel, and is provided with a second permanent magnet that is magnetically coupled to the first permanent magnet; a bearing portion that is provided on the impeller portion and the welding portion to guide the rotation of the impeller portion; And a rotary shaft coupled to the upper part of the impeller part while accommodating the bearing part protruding from the upper part of the impeller part; a cylindrical protrusion is formed on the upper part of the impeller part, and a mounting groove in which the protrusion is mounted is forcibly fitted on the lower part of the rotary shaft, and the impeller part and the rotary shaft are formed as one body by welding, and then the outer surface of the rotary shaft is processed to improve coaxiality.

Description

Magnetic mixing device with improved coaxiality

The present invention relates to a magnetic mixing device with improved coaxiality, and more specifically, to a magnetic mixing device with improved coaxiality, which prevents, with a simple and low cost, shaking or flowing deformation that occurs when the rotational shaft is rotated by coaxially processing the rotational shaft after welding it to an impeller.

In general, a magnetic mixing device has a rotor equipped with a magnet mounted on one end of the output shaft of a motor, and an impeller equipped with a magnet is mounted on the top of the rotor to fix and rotate the impeller using magnetic force.

An example of such a magnetic mixing device can be found in Korean Patent No. 10-1099029 entitled “Reaction and fermentation stirring device using a magnetic coupler.”

Figure 1 is a drawing showing a reaction fermentation stirring device using a conventional magnetic coupler, and Figure 2 is an exploded cross-sectional view of the main parts of a reaction fermentation stirring device using a conventional magnetic coupler. (The symbols in the drawing are directly quoted from the symbols in the conventional specification.)

Referring to FIGS. 1 and 2, a conventional reaction and fermentation stirring device using a magnetic coupler comprises: a reaction vessel; a welding plate comprising a basic welding structure (210) welded and fixed to the lower portion of the reaction vessel, and a fastening bolt (220) fastening the basic welding structure (210) to a motor housing (130); an impeller (300) comprising a lower impeller (310) provided on the inside of the reaction vessel and coupled to the basic welding structure (210) and containing a magnetic substance inside; And it includes a motor drive unit (100) which is provided on the outside of the reaction vessel and is coupled to the basic welding structure (210), and is composed of a motor (110) that generates driving force, a reducer (120) mounted on the motor (110), a rotor (140) installed on the rotational axis of the reducer (120), an external magnetic body (150) installed at the end of the rotor (140) and interlocked with a magnetic body in the lower impeller (310), and a motor housing (130) installed on the reducer (120) and protecting the rotor (140) connected to the external magnetic body (150).

In addition, the impeller (300) is further provided with a bearing and an extension shaft (350) on the upper portion of the lower impeller (310), and a multi-stage turbine impeller (360) is installed on the extension shaft (350).

However, since the connection between the lower impeller (310) and the extension shaft (350) is formed by a screw connection and the lower impeller (310) is rotated by the power of the driving motor (110), there is a problem in that the coaxiality of the extension shaft (350) is not precise due to the tolerance caused by the screw connection, and thus the extension shaft (350) shakes or tilts to one side or is biased, preventing smooth power transmission.

In order to solve these problems, the "magnetic mixing device" of Utility Model No. 20-0488254, previously filed and registered by the applicant of the present application, discloses a technology in which a hollow rotational shaft is installed on the upper part of an impeller and a deformation-prevention shaft is combined inside the rotational shaft.

Figure 3 is a drawing showing a conventional magnetic mixing device.

Referring to FIG. 3, a conventional magnetic mixing device comprises: a driving motor (110); a housing (120) that accommodates an output shaft of the stirring vessel; a rotary rotor (130) that is coupled with an upper end of the output shaft protruding from the upper portion of the housing (120) and has a first permanent magnet (M1) provided therein; a welding portion (140) that is coupled to the stirring vessel while rotatably accommodating the rotary rotor (130); an impeller portion (150) that is coupled to the welding portion (140) and arranged inside the stirring vessel and has a second permanent magnet (M2) that is magnetically coupled to the first permanent magnet (M1); And a bearing part (150) provided between the impeller part (150) and the welding part (140) to guide the rotation of the impeller part (150), in a magnetic mixing device including: a hollow rotation shaft (170) that is seated on the upper part of the impeller part (150) while accommodating the bearing part (150) protruding from the upper part of the impeller part (150); a deformation-preventing shaft (180) that is connected to the welding part (140) while being inserted into the rotation shaft (170); a movement-preventing cap (190) that is inserted into the open upper part of the rotation shaft (170) to prevent shaking of the rotation shaft (170); and a plurality of stirring blades (153) provided on the rotation shaft (170) at a constant interval along the longitudinal direction of the rotation shaft (170); and the lower end of the deformation-preventing shaft (180) is connected to a connecting groove formed in the welding portion (140) via a hole formed in the bearing portion (150).

In addition, the rotation shaft (170) can be connected to the male bearing (163) of the bearing part (160) by a welding method, and a welding hole (172) can be formed at the lower end of the rotation shaft (170) so that a worker can easily perform welding work between the rotation shaft (170) and the bearing part (160).

The above welding holes (172) are formed in multiple numbers along the lower circumferential direction of the rotation shaft (170), and can be formed in a size that allows a worker to easily visually check the circumferential surface of the male bearing (163) and insert a welding rod at the same time.

Accordingly, the worker can fixally secure the lower end of the rotation shaft (170) to the main body (151) of the impeller part (150) by joining the lower inner surface of the rotation shaft (170) and the upper peripheral surface of the male bearing (163) through the welding machine (172).

However, the conventional mixing device has been improved to minimize the rotational axis from shaking or flowing due to external force and bending deformation by improving the coaxiality compared to the conventional reaction fermentation stirring device using a magnetic coupler, but has a problem in that its structure is complex and the number of parts increases, which increases the cost.

Registration Patent No. 10-1099029 (Announcement Date: December 26, 2011) Utility Model Registration No. 20-0488254 (Publication Date: January 3, 2019)

The present invention is to solve the problems of the above-mentioned prior art, and the purpose of the present invention is to provide a magnetic mixing device with improved coaxiality, which prevents the shaking or flowing and bending deformation that occurs when the rotation shaft is rotated by simply and at low cost by welding the rotation shaft to the impeller and then coaxially processing the rotation shaft.

In order to achieve the present invention, a magnetic mixing device with improved coaxiality comprises: a driving motor; a housing that accommodates an output shaft of the driving motor; a rotary rotor that protrudes from an upper portion of the housing and is coupled with an upper end of the output shaft, and is provided with a first permanent magnet; a welding portion that is coupled to a stirring vessel while rotatably accommodating the rotary rotor; an impeller portion that is coupled to the welding portion and is arranged inside the stirring vessel, and is provided with a second permanent magnet that is magnetically coupled with the first permanent magnet; a bearing portion that is provided above the impeller portion and the welding portion and guides rotation of the impeller portion; And a rotary shaft coupled to the upper part of the impeller part while accommodating the bearing part protruding from the upper part of the impeller part; a cylindrical protrusion is formed on the upper part of the impeller part, and a mounting groove in which the protrusion is mounted is forcibly fitted on the lower part of the rotary shaft, and the impeller part and the rotary shaft are formed as one body by welding, and then the outer surface of the rotary shaft is processed to improve coaxiality.

In addition, the lower part of the rotation shaft has a larger diameter than the upper part, and a bushing is installed on the inside of the lower part to surround the bearing part.

In addition, a bolt head is formed at the upper end of the bearing portion, and a tool insertion groove is formed on the rotation axis corresponding to the bolt head so that a tool is combined with the bolt head to fix the bearing portion to the lower portion, and lubrication of fluid is possible through the tool insertion groove, so that lubrication is achieved between the bearing and the bushing.

In addition, the bushings are respectively coupled to both ends of the upper and lower portions of the bearing portion, and a lubrication groove is formed on the rotation axis between the bushings to enable lubrication of fluid between the bushing and the bearing.

In order to achieve the present invention, a magnetic mixing device with improved coaxiality according to the present invention can prevent, at a simple and low cost, deformation caused by shaking or flowing during rotation of the rotation shaft by welding the rotation shaft to the impeller and then coaxially processing the rotation shaft.

Figure 1 is a drawing showing a reaction fermentation stirring device using a conventional magnetic coupler.
Figure 2 is an exploded cross-sectional view of the main parts of a reaction fermentation stirring device using a conventional magnetic coupler.
Figure 3 is a drawing showing a conventional magnetic mixing device.
FIG. 4 is a cross-sectional view showing a stirrer having a magnetic mixing device with improved coaxiality according to the present invention.
Figure 5 is a cross-sectional view showing an example of a magnetic mixing device with improved coaxiality according to the present invention.
Figure 6 is an exploded cross-sectional view showing an example of a magnetic mixing device with improved coaxiality according to the present invention.
Figure 7 is an exploded perspective view of the impeller and rotating shaft of a magnetic mixing device with improved coaxiality according to the present invention.
Figure 8 is a cross-sectional view showing another embodiment of a magnetic mixing device with improved coaxiality according to the present invention.
Figure 9 is an exploded cross-sectional view showing another embodiment of a magnetic mixing device with improved coaxiality according to the present invention.

The advantages and features of the present invention, and the method for achieving them, will become clear with reference to the embodiments described in detail below together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and these embodiments are provided only to make the disclosure of the present invention complete and to fully inform a person having ordinary skill in the art to which the present invention belongs of the scope of the invention, and the present invention is defined by the description of the claims.

Meanwhile, the terminology used in this specification is for the purpose of describing embodiments and is not intended to limit the present invention. In this specification, the singular also includes the plural unless specifically stated in the phrase. The terms "comprises" and/or "comprising" as used in the specification do not exclude the presence or addition of one or more other components, steps, operations, and/or elements to the mentioned components, steps, operations, and/or elements. Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings.

FIG. 4 is a cross-sectional view showing a stirrer having a magnetic mixing device with improved coaxiality according to the present invention installed, FIG. 5 is a combined cross-sectional view showing an example of a magnetic mixing device with improved coaxiality according to the present invention, FIG. 6 is an exploded cross-sectional view showing an example of a magnetic mixing device with improved coaxiality according to the present invention, and FIG. 7 is an exploded perspective view of an impeller and a rotating shaft of a magnetic mixing device with improved coaxiality according to the present invention.

Referring to FIGS. 4 to 7, a magnetic mixing device (100) with improved coaxiality according to the present invention mixes fluids by rotating an impeller part (150) and a rotation shaft (170) inside the stirring vessel (200) using the power of a driving motor (110) installed outside the stirring vessel (200), and includes a driving motor (110), a housing (120), a rotating rotor (130), a welding part (140), an impeller part (150), a bearing part (160), and a rotation shaft (170). (For reference, this embodiment is applied to a device requiring high-speed rotation since the motor and the impeller part are directly connected.)

The above driving motor (110) is a power source that transmits rotational power to the impeller part (150) and can be placed on the outer lower part of the stirring vessel (200).

The above housing (120) accommodates the output shaft of the driving motor (110) and serves to protect the output shaft (111) from the outside. One end may be connected to the driving motor (110) and the other end may be connected to the bottom of the welding part (140).

The above-mentioned rotary rotor (130) protrudes from the upper portion of the housing (120) and is coupled with the upper portion of the output shaft (111), and a first permanent magnet (131) is provided. The first permanent magnets (131) can be built into the rotary rotor (130) in multiple pieces at a set interval from each other, and can be arranged along the upper circumferential direction of the rotary rotor (130) and rotated together with the rotary rotor (130) by the driving of the driving motor (110).

The welding portion (140) is coupled to the stirring vessel (200) while rotatably receiving the rotary rotor (130), and can be coupled to the stirring vessel (200) while being inserted into an insertion hole (210) formed at the bottom of the stirring vessel (200), and may include a protruding cap (142) that is inserted into the insertion hole (210) formed at the bottom of the stirring vessel (200) and protrudes into the interior of the stirring vessel (200) to form a first receiving space (141) into which the rotary rotor (130) can be inserted, and a flange (143) that is provided at the bottom of the protruding cap (142) and makes contact with the stirring vessel (200).

The above protruding cap (142) is a part placed inside the stirring vessel (200), and as described above, a first receiving space (141) is formed inside the cap into which the rotating rotor (130) can be inserted and rotated.

The above flange (143) can be joined to the inner surface of the stirring vessel (200) that defines the insertion hole (210) or the bottom surface or lower surface of the stirring vessel (200) while inserted into the insertion hole (210).

The method by which the flange (143) is joined to the stirring vessel (200) may use various known joining methods. However, in terms of maintaining the airtightness of the stirring vessel (200), it is preferable to join the circumference of the flange (143) and the inner surface of the insertion hole (210) of the stirring vessel (200) to each other using a welding method. Alternatively, it is also preferable to use a method in which the flange (143) and the stirring vessel (200) are joined to each other using known fastening means such as bolts or nuts, and then a sealing member is used to maintain the airtightness of the stirring vessel (200).

The above impeller part (150) is arranged inside the stirring vessel (200) by being combined with the welding part (140), and is provided with a second permanent magnet (153) that is magnetically coupled with the first permanent magnet (131), and forms a second receiving space (154) into which the protruding cap (142) of the welding part (140) can be inserted. However, the impeller part (150) may include a main body (151) in which the second permanent magnet (153) is built, and a plurality of first stirring blades provided at a certain interval from each other on the outer surface of the main body (151).

That is, since the second permanent magnet (153) built into the main body (151) can be magnetically coupled with the first permanent magnet (131) of the rotary rotor (130) inserted into the first receiving space (141) of the protruding cap (142), the main body (151) can rotate in conjunction with the rotary rotor (130) rotated by the driving motor (110).

The above bearing part (160) is provided above the impeller part (150) and the welding part (140) to guide the rotation of the impeller part (150).

In addition, a bolt head (161) is formed on the upper part of the bearing part (160), and a tool insertion groove (171) is formed on the rotation axis (170) corresponding to the bolt head (161) so that a tool is combined with the bolt head (161) to fix the bearing part (160) to the lower part, and lubrication of fluid is possible through the tool insertion groove (171), so that lubrication is achieved between the bearing part (160) and the bushing (180).

The above rotation shaft (170) is coupled to the upper portion of the impeller portion (150) while accommodating the bearing portion (160) protruding from the upper portion of the impeller portion (150).

Looking at this in more detail, a cylindrical protrusion (155) is formed on the upper part of the impeller part (150), and the protrusion (155) is fitted into a mounting groove (174) on the lower part of the rotary shaft (170) by force, and the impeller part (150) and the rotary shaft (170) are formed as one body by welding, and then the outer surface of the rotary shaft (170) is processed to improve coaxiality.

That is, it is possible to prevent the rotation shaft from shaking or flowing and being bent or deformed due to the coaxiality not matching due to the tolerance caused by screw connection as in the past.

In addition, the lower part of the rotation shaft (170) has a larger diameter than the upper part, and a bushing (180) is installed on the inside of the lower part to surround the bearing part (160).

In addition, the bushing (180) is coupled to each of the upper and lower ends of the bearing part (160), and a lubrication groove (172) is formed on the rotation shaft (170) between which the bushing (180) is coupled, so that fluid lubrication is possible between the bushing (180) and the bearing part (160).

In addition, at least one second stirring blade (173) is connected to the outer surface of the rotating shaft (170) by a bolt connection or the like and installed in a stirring vessel (200) to be used for stirring the fluid.

FIG. 8 is a cross-sectional view showing another embodiment of a magnetic mixing device with improved coaxiality according to the present invention, and FIG. 9 is an exploded cross-sectional view showing another embodiment of a magnetic mixing device with improved coaxiality according to the present invention. (A reducer is installed between the motor and the impeller and is applied to a device requiring low-speed rotation.)

In this embodiment, a known reducer (190) that reduces the rotation speed of the output shaft (111) or changes the rotation direction of the output shaft (111) may be mounted on the drive motor (110), and other components are the same, so a detailed description is omitted.

The magnetic mixing device (100) of the present invention, which is configured in this manner and has improved coaxiality, is fixed by welding or the like to an insertion hole (210) formed at the bottom of a stirring vessel (200).

The upper part of the above welding part (140) is positioned with a protruding cap (142) installed on the inside, and an impeller part (150) with a second permanent magnet (153) formed on the upper part of the protruding cap (142) is rotatably coupled.

And, a rotation shaft (170) is formed integrally on the upper part of the impeller part (150), and the fluid inside the stirring vessel (200) is stirred by a second stirring blade (173) coupled to the impeller and the rotation shaft (170).

In other words, a cylindrical protrusion (155) is formed at the upper end of the impeller part (150), and the protrusion (155) is forcibly fitted into a mounting groove (174) at the lower end of the rotation shaft (170) and welded into place.

The welded impeller part (150) and the rotary shaft (170) are combined with a processing machine and then the outer surface of the rotary shaft (170) is precisely machined to improve coaxiality.

In addition, a bearing part (160) is fixed to the upper part of the protruding cap (142), and the bearing part (160) is installed inside the impeller part (150) so that the impeller part (150) can easily rotate.

In addition, at least one bushing (180) is coupled between the bearing part (160) and the impeller part (150) to facilitate rotation of the bearing part (160).

A rotary rotor (130) is coupled to the lower portion of the welding portion (140), and the rotary rotor (130) is made rotatable by magnetic force between the second permanent magnet (153) of the impeller portion (150) and the first permanent magnet (131) installed on the rotary rotor (130), and the rotary rotor (130) is coupled to the output shaft (111) of the drive motor (110) or the output shaft of the reducer (190) to connect the power of the drive motor (110).

Although the present invention has been described with reference to one embodiment illustrated in the accompanying drawings, it will be understood by those skilled in the art that various modifications and other embodiments are possible.

100: Magnetic mixing device 110: Driving motor
111: Output shaft 120: Housing
130: Rotor 131: First permanent magnet
140: Welding section 141: First receiving space
142: Protruding cap 143: Flange
150: Impeller part 151: Body
153: Second permanent magnet 154: Second receiving space
155: Protrusion 160: Bearing
161: Bolt head 170: Rotating shaft
171: Tool insertion groove 172: Lubrication groove
173: Second stirring blade 174: Settling home
180: Bushing 190: Reducer
200: Stirring vessel 210: Insert hole

Claims (4)

drive motor;
A housing accommodating the output shaft of the above driving motor;
A rotating rotor protruding from the upper portion of the housing and coupled with the upper portion of the output shaft, wherein a first permanent magnet is provided;
A welding part that is connected to a stirring vessel while rotatably accommodating the above-mentioned rotary rotor;
An impeller part which is arranged inside the stirring vessel and is connected to the welding part, and which is provided with a second permanent magnet which is magnetically connected to the first permanent magnet;
A bearing part provided on the upper part of the impeller part and the welding part to guide the rotation of the impeller part; and
It includes a rotating shaft coupled to the upper part of the impeller part while accommodating the bearing part protruding from the upper part of the impeller part;
A cylindrical protrusion is formed on the upper part of the impeller part, and the protrusion is forcibly fitted into a mounting groove on the lower part of the rotation shaft, and the impeller part and the rotation shaft are formed as one piece by welding, and then the outer surface of the rotation shaft is processed to improve coaxiality.
The lower part of the above-mentioned rotary shaft has a larger diameter than the upper part, and a bushing is installed on the inside of the lower part to surround the bearing part.
A magnetic mixing device with improved coaxiality characterized in that a bolt head is formed on the upper part of the bearing part, a tool insertion groove is formed on the rotation axis corresponding to the bolt head so as to attach a tool to the bolt head and fix the bearing part to the lower part, and lubrication of fluid is possible through the tool insertion groove so as to occur between the bearing and the bushing.
delete delete In the first paragraph,
A magnetic mixing device with improved coaxiality, characterized in that the bushings are respectively coupled to both ends of the upper and lower portions of the bearing portion, and a lubrication groove is formed on the rotational axis between the bushings to enable lubrication of fluid between the bushing and the bearing.

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