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An apparatus for mixing viscous material includes a chamber having a cylindrical sidewall and a bottom and receiving viscous material to be mixed; a cylindrical draft tube fixed at an inside center of the chamber to be spaced from the bottom and the sidewall and forming a space between the draft tub

An apparatus for mixing viscous material includes a chamber having a cylindrical sidewall and a bottom and receiving viscous material to be mixed; a cylindrical draft tube fixed at an inside center of the chamber to be spaced from the bottom and the sidewall and forming a space between the draft tube and the sidewall to allow passage of the viscous material, and including a heat medium passage therein; a carrying impeller installed in the draft tube and driven by a motor to transfer the viscous material above or below the draft tube and suck the viscous material in the space into the draft tube; and a sweeping impeller installed in the space and rotated in a circumferential direction by a motor to apply a pressure to the viscous material so that the viscous material in the space is not adhered to the draft tube and the sidewall.

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1. An apparatus for mixing viscous material, comprising: a chamber having a cylindrical sidewall and a bottom, the chamber receiving viscous material to be mixed;a cylindrical draft tube fixed at an inside center of the chamber to be spaced apart from the bottom, the draft tube being spaced apart fr

1. An apparatus for mixing viscous material, comprising: a chamber having a cylindrical sidewall and a bottom, the chamber receiving viscous material to be mixed;a cylindrical draft tube fixed at an inside center of the chamber to be spaced apart from the bottom, the draft tube being spaced apart from the sidewall of the chamber and forming a space between the draft tube and the sidewall of the chamber so that the viscous material passes through the space, the draft tube including a heat medium passage therein through which a heat medium supplied from outside passes;a carrying impeller installed in the draft tube and driven by a power supplied from an external driving means to transfer the viscous material above or below the draft tube and suck the viscous material located in the space into the draft tube; anda sweeping impeller installed in the space and rotated in a circumferential direction of the draft tube with the power supplied from an external driving means to apply a pressure to the viscous material so that the viscous material in the space is not adhered to an outer circumference of the draft tube and an inner circumference of the sidewall of the chamber,wherein the draft tube is fixed to the chamber and does not rotate;wherein the sweeping impeller has a plate shape with a width (w) corresponding to 85% to 95% of a width of the space, and the plate shape is formed vertically downward toward the bottom of the chamber along the space;wherein the sweeping impeller is installed not to contact the inner circumference and the outer circumference; andwherein, when the sweeping impeller rotates, space parts (E) are formed between the sweeping impeller and the inner circumference and between the sweeping impeller and the outer circumference,wherein the carrying impeller includes: a driving shaft positioned on a central axis of the draft tube and axially rotated with a torque transmitted from outside; anda spiral blade fixed to an outer circumference of the driving shaft and extended in a screw shape, the spiral blade having a front end spaced apart from an inner circumference of the draft tube by a predetermined distance,wherein the sweeping impeller has a plate shape parallel with the driving shaft,wherein the apparatus further comprises a rotating rod acting as a driving means for transferring a rotating force to the sweeping impeller, the rotating rod being fixed to the driving shaft and extended to an upper portion of the space, the sweeping impeller being coupled to an end of the rotating rod,wherein there is provided a plurality of rotating rods arranged at regular angles, an upper end of the sweeping impeller is fixed to each rotating rod, and the sweeping impeller is reinforced with frames so as to prevent deformation due to a flow resistance caused by the viscous material while the sweeping impeller is rotating, andwherein one or more of the frames are arranged in the circumferential direction of the draft tube, and another one or more of the frames have one end fixed to the upper end of one sweeping impeller and the other end fixed to the lower end of another sweeping impeller. 2. The apparatus for mixing viscous material according to claim 1, wherein a heat medium passage for allowing a heat medium supplied from outside to pass therethrough is provided in the sidewall of the chamber. 3. The apparatus for mixing viscous material according to claim 1, wherein the sweeping impeller has constant thickness and width, and while being rotated, the sweeping impeller allows an edge thereof in a width direction to separate the viscous material adhered to the inner circumference of the sidewall of the chamber and the outer circumference of the draft tube from an adhesion surface, thereby promoting heat exchange between the corresponding adhesion surface and the beat medium. 4. The apparatus for mixing viscous material according to claim 1, wherein an upper end of the sweeping impeller is fixed to the rotating rod, and the sweeping impeller has a plurality of through holes for the viscous material to pass therethrough so as to reduce a flow resistance caused by the viscous material while the sweeping impeller is rotating. 5. An apparatus for mixing viscous material, comprising: a chamber having a cylindrical sidewall and a bottom, the chamber receiving viscous material to be mixed;a plurality of cylindrical draft tubes fixed at an inside center of the chamber to be spaced apart from the bottom, the draft tubes being spaced apart from the sidewall of the chamber with the same center and different diameters, the draft tubes passing the viscous materials through a space between the draft tubes and a space between the greatest draft tube and the sidewall, the draft tubes including heat medium passages therein through which a heat medium supplied from outside passes;a carrying impeller installed to a smallest one of the draft tubes and driven by the power supplied from an external driving means to carry the viscous material above or below the draft tubes and suck in the viscous material located in the spaces; anda plurality of sweeping impellers installed in the spaces and rotated in a circumferential direction of the draft tubes with the power supplied from an external driving means to apply a pressure to the viscous material so that the viscous material in the spaces is not adhered to facing surfaces of the draft tubes and facing surfaces of the draft tube and the chamber,wherein the draft tube is fixed to the chamber and does not rotate;wherein the sweeping impeller has a plate shape with a width (w) corresponding to 85% to 95% of a width of the space, and the plate shape is formed vertically downward toward the bottom of the chamber along the space;wherein the sweeping impeller is installed not to contact the inner circumference and the outer circumference; andwherein, when the sweeping impeller rotates, space parts (E) are formed between the sweeping impeller and the inner circumference and between the sweeping impeller and the outer circumference,wherein the carrying impeller includes: a driving shaft positioned on a central axis of the draft tube and axially rotated with a torque transmitted from outside; anda spiral blade fixed to an outer circumference of the driving shaft and extended in a screw shape, the spiral blade having a front end spaced apart from an inner circumference of the draft tube by a predetermined distance,wherein the sweeping impeller has a plate shape parallel with the driving shaft,wherein the apparatus further comprises a rotating rod acting as a driving means for transferring a rotating force to the sweeping impeller, the rotating rod being fixed to the driving shaft and extended to an upper portion of the space, the sweeping impeller being coupled to an end of the rotating rod,wherein there is provided a plurality of rotating rods arranged at regular angles, an upper end of the sweeping impeller is fixed to each rotating rod, and the sweeping impeller is reinforced with frames so as to prevent deformation due to a flow resistance caused by the viscous material while the sweeping impeller is rotating, andwherein one or more of the frames are arranged in the circumferential direction of the draft tube, and another one or more of the frames have one end fixed to the upper end of one sweeping impeller and the other end fixed to the lower end of another sweeping impeller. 6. The apparatus for mixing viscous material according to claim 5, wherein a heat medium passage for allowing a heat medium supplied from outside to pass therethrough is provided in the sidewall of the chamber. 7. The apparatus for mixing viscous material according to claim 5, wherein the sweeping impeller has constant thickness and width, and while being rotated, the sweeping impeller allows an edge thereof in a width direction to separate the viscous material adhered to the inner circumference of the sidewall of the chamber and the outer circumference of the draft tube from an adhesion surface, thereby promoting heat exchange between the corresponding adhesion surface and the heat medium. 8. The apparatus for mixing viscous material according to claim 5, wherein an upper end of the sweeping impeller is fixed to the rotating rod, and the sweeping impeller has a plurality of through holes for the viscous material to pass therethrough so as to reduce a flow resistance caused by the viscous material while the sweeping impeller is rotating.