JP2012106201A - Stirring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stirring device which can improve the lubrication performance and wear resistance of a bearing arranged in a stirring tank, and can be elongated in life.SOLUTION: The stirring device 1 having a stirring blade 4 rotatably arranged in the stirring tank 2 which can house a liquid L to be stirred via the bearing 7 incluldes: a magnetic coupling mechanism 9 which has a drive-side rotor 91 arranged outside the stirring tank 2 and rotating on the basis of a drive force from a drive source, and a driven-side rotor 92 connected to the stirring blade 4 in the stirring tank 2, and connects the drive-side rotor 91 and the driven-side rotor 92 via a partitioning wall; and a rotating blade 8 which rotates together with the stirring blade 4. The stirring device generates negative pressure by using the rotating blade 8 and sucks the liquid L to be stirred to a region in which the bearing 7 slides by the negative pressure.

Description

  The present invention relates to a stirring device used in various industries such as pharmaceuticals, foods, cosmetics, fine chemicals, and petrochemicals.

  In recent years, in various industries such as pharmaceuticals, foods, cosmetics, fine chemicals, and petrochemicals, agitation processing using an agitation apparatus is performed in a wide variety.

  The stirrer normally has a stirring blade rotatably disposed in a stirring tank that contains liquid, and by rotating the stirring blade, the concentration change due to the stagnation of the liquid in the tank is suppressed, and Sedimentation of solids at the bottom is suppressed. Power is transmitted to the rotating shaft that holds the blades from a driving source outside the tank. To prevent liquid leakage from the sliding portion of the shaft, a ground packing seal or mechanical seal is used as the shaft seal. in use. However, it is difficult to completely prevent liquid leakage as long as the sliding portion is structurally present, and although the amount of leakage depends on the scale of the stirring tank, economic loss is large. In addition, when storing a liquid that is not desirable to leak, such as a highly flammable liquid, two mechanical seals are disposed in opposite directions, and an external injection liquid is to be sealed between the two mechanical seals. A double mechanical seal that is injected at a pressure higher than the pressure of the liquid is used, but it is very expensive.

  In addition, the shaft sliding portion for suppressing liquid leakage requires periodic inspection and maintenance, and is frequently replaced, resulting in a large maintenance cost.

  For this reason, a stirring blade is rotatably disposed in the stirring tank via a bearing, and the rotational driving force is applied to the stirring blade via a magnetic coupling drive transmission mechanism that transmits the driving force in a non-contact manner using magnetic force. An apparatus for transmitting is provided (see, for example, Patent Document 1). In the apparatus described in Patent Document 1, since the driving force is transmitted in a non-contact manner, the stirring blade in the stirring tank can be driven by a driving source outside the stirring tank with the partition wall of the stirring tank interposed therebetween, Since there is no shaft sliding portion, maintenance of the shaft sliding portion is unnecessary.

JP 2001-353432 A

  In the apparatus described in Patent Document 1 described above, a bearing that is likely to wear out is provided in the stirring tank. Therefore, in order to extend the life of the stirring apparatus, the lubricity and wear resistance of the bearing must be improved. Is preferred.

  The present invention has been made to solve the above-described problems, and provides a stirring device capable of extending the life by improving the lubricity and wear resistance of a bearing disposed in a stirring tank. Objective.

  The stirrer according to the present invention that achieves the above object is a stirrer having a stirring blade that is rotatably disposed via a bearing in a stirrer that can contain a stirring liquid. The stirring device includes a driving-side rotor that rotates based on a driving force from a driving source provided outside the stirring tank, and a driven-side rotor that is connected to the stirring blade in the stirring tank. A magnetic coupling drive transmission mechanism for non-contact coupling with a driven rotor by a magnetic coupling via a partition continuous with the stirring tank, and a rotating blade that rotates together with the stirring blade, and the rotation A negative pressure is generated by the blade, and the stirring liquid is sucked into the sliding portion of the bearing by the negative pressure.

  According to the stirrer configured as described above, since the rotor blade is provided, it becomes possible to suck the agitating liquid into a portion where the bearing slides due to the negative pressure generated by rotating the rotor blade, The agitation liquid can be effectively used as a lubricating liquid, and the lubricity and wear resistance of the bearing can be improved and the life of the bearing can be extended.

  In addition, if the tubular cover portion that covers the space communicating with the suction side of the rotary blade is provided between the rotary blade and the stirring blade, the flow of the stirring liquid can be regulated by the cover portion. The negative pressure can be efficiently generated inside the interior.

  Further, if the cover part has an inclined part formed to be inclined toward the rotor blade as it goes outward in the radial direction, the flow of the stirring liquid can be efficiently guided on both the inside and outside of the cover part. The occurrence of turbulence can be suppressed.

  Further, if the bearing has a groove extending in the axial direction at the sliding portion, the stirring liquid can easily flow through the bearing, and the lubricity and wear resistance of the bearing can be further improved. .

  Further, if the stirring blade unit including the stirring blade, the magnetic coupling mechanism, and the rotary blade is a side surface type disposed on the side wall of the stirring tank, complete leakage-free and maintenance-free stirring can be performed on the side surface. This can be easily realized with a stirring device of the type.

It is a side view which shows the stirring apparatus which concerns on embodiment of this invention. It is sectional drawing which shows the stirring unit in this embodiment. It is a front view which shows the stirring unit in this embodiment. FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. FIG. 5 is a cross-sectional view taken along line 5-5 in FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted. In addition, the dimensional ratio in the drawing may be different from the actual ratio for convenience of explanation.

  As shown in FIG. 1, the stirring device 1 according to this embodiment includes, for example, a stirring tank 2 that can store a stirring liquid L to be heated, and a side-type stirring blade unit that is installed on a wall surface 22 of the stirring tank 2. 3 is provided. The side-type agitating blade unit 3 is used when it is difficult to attach the agitating blade unit to the bottom surface, such as when an outlet is provided on the bottom surface, or when the stirring tank 2 is large and directly placed on the floor surface. It is particularly effective. The stirring blade unit 3 causes the stirring liquid L in the stirring tank 2 to generate a flow that rotates along the inner wall surface of the stirring tank 2 in a horizontal section, and also along the inner wall surface of the stirring tank 2 in a vertical section. It is preferable to attach to the stirring tank 2 so as to generate a flow rotating in the vertical direction. Therefore, the stirring blade unit 3 is configured so that the stirring blades are directed in the direction along the inner wall surface from the central direction of the stirring vessel 2 so that the stirring liquid L rotates along the inner wall surface of the stirring vessel 2 in a horizontal section. Can be tilted. Further, the stirring blade unit 3 is disposed so that the stirring blade L faces downward (or upward) from the horizontal direction so that the stirring liquid L rotates along the inner wall surface of the stirring tank 2 in a vertical section. obtain. In the present embodiment, only one stirring blade unit 3 is provided. However, for example, a plurality of stirring blade units 3 may be provided on the side surface of the stirring tank 2 at intervals.

  As shown in FIGS. 2 to 5, the stirring blade unit 3 is fixed to the stirring tank 2 by being inserted into an opening 21 provided on the side of the stirring tank 2. In the stirring blade unit 3, an axial flow type stirring blade 4 is rotatably provided in the stirring tank, and a drive source for driving the axial flow type stirring blade 4 is provided outside the stirring tank. Although the axial flow type agitating blade 4 includes three blades 41 (see FIG. 3), the number of the blades 41 is not limited to three and may be different. The axial flow type agitating blade 4 generates a fluid flow mainly in the axial direction by rotating.

  The agitating blade unit 3 is liquid-tightly attached to the agitating tank 2 with a gasket or the like sandwiched by an attachment flange 51 fixed to the outer periphery of the cylindrical main body 5 by welding or the like. A cylindrical partition wall portion 6 communicating with the internal space of the main body portion 5 is connected to the inner side of the main body portion 5 by a bolt 53 with a gasket 52 interposed therebetween. The end partition wall 61 is formed so as to be isolated from the inside of the agitation tank 2. The tip partition wall 61 is further formed with a convex portion 62 projecting toward the distal end direction, and a fixed shaft 63 extending in the distal end direction is screwed to the convex portion 62.

  A bush-shaped blade fixing bearing 7 that is rotatably fitted is provided on the outer periphery of the fixed shaft 63, and the axial flow type stirring blade 4 is attached to the outer periphery of the blade fixing bearing 7. Four lubrication grooves 71 (groove portions) arranged at equal intervals in the circumferential direction are formed on the inner peripheral surface of the blade fixing bearing 7 so as to extend in the axial direction. In addition, the number of the lubrication grooves 71 is not limited to four, but may be a number different from one or more four, or one may not be formed. Further, the shape of the groove is not necessarily linear along the axial direction. For example, the groove may be formed to be inclined with respect to the axial direction, or may be spiral. Further, a lubricating groove may be formed on the outer peripheral surface of the fixed shaft 63 that constitutes the bearing together with the blade fixing bearing 7.

  In the agitating tank outer side direction of the axial flow type impeller 4 (hereinafter, sometimes referred to as a base end direction or a base end side), an inclined portion 45 whose outer diameter is inclined and expands toward the base end direction. The cover part 42 provided with is fixed by welding or the like. On the inner side of the cover portion 42, an inner space portion S of about tens of millimeters is formed between the convex portion 62 and the fixed shaft 63.

  A circumferential flow type rotary blade 8 (rotary blade) is connected to the base end side of the cover portion 42. The circumferential flow type rotary blade 8 is obtained by attaching a predetermined number (four in this embodiment) of blade members 82 to a ring-shaped rotary plate 81 at predetermined angular intervals (see FIG. 4). Thus, as indicated by the arrow in FIG. 4, the stirring liquid L is discharged in the circumferential direction from the inner space S inside the cover 42.

A cylindrical driven rotor 92 arranged with a clearance from the outer peripheral surface of the cylindrical partition wall 6 is connected to the proximal end side of the circumferential flow type rotary blade 8. The driven-side rotor 92 is coupled to the cover portion 42 with the circumferential flow type rotary blade 8 sandwiched between the bolt 43 and the nut 44.
The driven-side rotor 92 constitutes the magnetic coupling 9 together with the drive-side rotor 91 that rotates inside the partition wall portion 6, and can receive a rotational force from the drive-side rotor 91 through the partition wall portion 6 without contact. That is, the driven rotor 92 that receives the rotational force from the driving rotor 91 integrally rotates the axial flow type stirring blade 4 and the circumferential flow type rotating blade 8 that are rotatably installed on the blade fixing bearing 7. . Therefore, since the driving force can be transmitted without providing a seal portion, the completely leak-free sealless stirring device 1 can be realized with a simple structure, and a maintenance-free operation is possible. And by making it maintenance-free, inspection and maintenance costs can be reduced.

  Inside the main body 5, a drive shaft 55 is installed coaxially with the main body 5 via a shaft fixing bearing 54, and the base end side of the drive shaft 55 is connected via the speed reducer 10. It is connected to a motor 11 that is a drive source. The inner side of the agitation tank of the drive shaft 55 is connected to the inner peripheral surface of the cylindrical partition wall 6 and a columnar drive-side rotor 91 arranged with a clearance.

  The drive side rotor 91 and the driven side rotor 92 constitute the magnetic coupling mechanism 9 as described above. As shown in FIG. 5, the drive-side rotor 91 has a drive-side shaft portion 911 made of a non-magnetic metal (for example, made of stainless steel / aluminum) that is rotationally driven based on the drive force from the motor 11. An inner coupling magnet of the magnetic coupling mechanism 9 (for example, a curved magnet having NS poles in the vertical direction to transmit rotational force and axial restraining force) 912 is circled on the outer peripheral surface of the shaft portion 911. They are arranged at predetermined intervals along the circumferential direction. Further, a curved yoke 913 made of magnetic metal (for example, SS-400) is disposed on the back side of the inner side coupling magnet 912 to increase the magnetic adhesion force of the magnetic coupling mechanism 9.

  The driven-side rotor 92 has a driven-side shaft portion 921 made of non-magnetic metal (for example, SUS-316L), and the outer-side coupling magnet 922 of the magnetic coupling mechanism 9 is formed on the inner peripheral surface of the driven-side shaft portion 921. (For example, a curved magnet having an SN pole in the vertical direction is used to transmit the rotational force and the axial restraining force) are arranged opposite to each other so as to be magnetically attracted to the inner side coupling magnet 912. is there. Further, a curved yoke 923 made of magnetic metal (for example, SS-400) is disposed on the back side of the outer coupling magnet 922 to increase the magnetic adhesion force of the magnetic coupling mechanism 9.

  Each of the coupling magnets 912 and 922 is preferably a ferromagnetic neodymium, but is not limited thereto, and other magnetic materials can be selected as appropriate.

  Next, the operation of the stirring device 1 according to the present embodiment will be described.

  First, the agitation liquid L is accommodated in the agitation tank 2, and thereafter, the agitation tank 2 is agitated under the air blocking condition.

  When the motor 11 is driven, the drive shaft 55 rotates, and the driving force is transmitted to the stirring tank 2 in a non-contact manner by the magnetic coupling mechanism 9, and the axial flow type stirring blade 4 and the circumferential flow type that are rotatably installed. The rotary blade 8 rotates integrally. The axial flow type stirring blade 4 generates a flow toward the shaft tip, and stirs the stirring liquid L in the stirring tank 2.

  The circumferential flow type rotary blade 8 that rotates together with the axial flow type stirring blade 4 causes the stirring liquid L to be discharged from the space portion in the circumferential direction, thereby generating a negative pressure in the inner space portion S. Since the inner space portion S is adjacent to the proximal end side of the blade fixing bearing 7, the stirring liquid L is forcibly sucked into the sliding portion between the blade fixing bearing 7 and the fixed shaft 63 from the distal end side. As a result, a flow of the agitation liquid L from the distal end side toward the proximal end side occurs in the sliding portion. The agitating liquid L of the sliding portion functions as a lubricating liquid. When the agitating liquid L flows from the distal end side to the proximal end side, the lubricity of the bearing is improved and the blade fixing bearing 7 and the fixed shaft 63 are improved. It is possible to reduce the occurrence of wear in the sliding portion. Thereby, the lifetime of the blade fixing bearing 7 is remarkably improved, and maintenance-free can be realized. Further, the circumferential flow type rotary blade 8 not only improves the lubricity of the bearing, but also contributes to the stirring in the stirring tank 2.

  In addition, a tubular cover portion 42 is provided between the circumferential flow type rotary blade 8 and the axial flow type rotary blade 4 so as to cover the inner space S that communicates with the suction side of the circumferential flow type rotary blade 8. The flow of the agitation liquid L can be regulated by the part 42, and the negative pressure can be efficiently generated inside the cover part 42.

  Further, since the tapered inclined portion 45 is formed in the cover portion 42, the flow of the stirring liquid L can be efficiently guided on both the inside and outside of the cover portion 42, and the occurrence of turbulence and the like can be suppressed.

  Further, since the lubricating groove 71 is formed in the blade fixing bearing 7, the stirring liquid L easily flows between the blade fixing bearing 7 and the fixed shaft 63, and the lubricity and wear resistance of the bearing are further improved. Can be improved.

  Further, when the axial flow type stirring blade 4 rotates in a medium speed rotation region (for example, 100 to 300 rpm), an unbalanced heavy load due to the turbulent flow of the stirring liquid L may be applied to the axial flow type stirring blade 4. In such a case, the blade fixing bearing 7 receives a load. Even in such a case, in the present embodiment, the driven rotor 92 is lightened by using a small and strong magnet, so that the attitude of the driven rotor 92 is easily stabilized. Therefore, the radial load acting on the blade fixing bearing 7 can be reduced, and contact with the partition wall portion 6 of the driven rotor 92 can be suppressed, and the life can be further improved.

  The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the claims. For example, the stirring blade unit 3 can be attached to the bottom instead of the side of the stirring tank 2. Further, the rotor blade for sucking the stirring liquid L between the blade fixing bearing 7 and the fixed shaft 63 is limited to a circumferential flow type rotor blade that generates a flow in the circumferential direction as long as suction is possible. For example, a mixed flow type or an axial flow type may be used.

1 stirrer,
2 stirring tank,
4 axial flow type impeller,
6 Bulkhead part (partition wall),
7 Wing fixing bearing (bearing),
8 circumferential flow type rotor (rotor),
9 Magnetic coupling mechanism,
11 Motor (drive source),
42 cover part,
45 Inclined part,
63 Fixed shaft (bearing),
71 Lubrication groove (groove),
91 drive side rotor,
92 driven rotor,
L stirring liquid,
S inner space.

Claims (5)

A stirring device having a stirring blade rotatably disposed through a bearing in a stirring tank capable of storing a stirring liquid,
A drive-side rotor provided outside the agitation tank and rotating based on a driving force from a drive source; and a driven-side rotor connected to the agitation blade in the agitation tank; the drive-side rotor and the driven-side rotor; A magnetic coupling mechanism for non-contact coupling with a magnetic coupling through a partition wall continuous with the stirring tank,
A rotating blade rotating together with the stirring blade;
And a negative pressure is generated by the rotary blade, and the negative pressure causes the stirring liquid to be sucked into a sliding portion of the bearing.   2. The stirring device according to claim 1, further comprising a tubular cover portion that covers a space communicating with a suction side of the rotary blade between the radial flow type rotary blade and the stirring blade.   The stirring device according to claim 2, wherein the cover portion has an inclined portion that is formed to be inclined toward the rotor blade toward a radially outward direction.   The stirring device according to any one of claims 1 to 3, wherein the bearing has a groove portion extending in an axial direction at the sliding portion.   The stirring blade unit including the stirring blade, the magnetic coupling mechanism, and the rotating blade is a side surface type disposed on a side wall of the stirring tank, according to any one of claims 1 to 4. Stirring device.

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