JPH0790157B2 - Stirrer - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stirrer, and more particularly to a stirrer having inner blades and outer blades arranged concentrically.

[0002]

2. Description of the Related Art Generally, in various manufacturing processes, stirring is performed in order to uniformly mix a plurality of substances in a tank, and a stirring device is used to efficiently perform this stirring. For example, in order to perform liquefaction saccharification of a grain in a brewing process, water and an enzyme are added to a grain, and temperature is controlled, stirring, and it is made to react. In this case, as a suitable stirring device, a first stirring blade (for example, an inner blade) and a second stirring blade (for example, an outer blade) are concentrically provided, and the first stirring blade and the second stirring blade are provided. A driving method is known. The driving of the first stirring blade and the second stirring blade may be performed by one power unit or may be individually driven by two power units.

[0003]

However, when both the first stirring blade and the second stirring blade are driven by a single power unit, a large output power is required to handle the maximum load in the initial stage of stirring. There was a problem that a device was required. On the other hand, the first stirring blade and the second stirring blade are each driven by different small power units so that only the first stirring blade is driven in the initial stage of stirring and the second stirring is performed after the contents start to flow. When driving the stirring blade, there is a problem that two power units are required. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a single power unit having a small output in a stirring device in which a first stirring blade and a second stirring blade are concentrically provided. The object of the present invention is to provide a stirring device capable of handling the maximum load in the initial stage of stirring.

[0004]

In order to achieve the above-mentioned object, the stirring device of the present invention is a stirring device in which a first stirring blade and a second stirring blade are concentrically arranged. A drive shaft that holds the stirring blade and is connected to the power unit, a first gear that is provided on the drive shaft, a second gear that is connected to the second stirring blade, the first gear and the second gear. A third gear arranged in the middle of the gear, wherein the driving force of the first gear is transmitted to the second gear via the third gear and the third gear can revolve around its axis. It is a thing.

[0005]

According to the present invention having the above-mentioned structure, the power device is provided on the drive shaft having the first stirring blade (for example, the inner blade) to drive the first stirring blade and the second stirring blade. In this case, at the maximum load in the initial stage of stirring, the first stirring blade rotates with the rotation of the drive shaft, but the third gear rotates and revolves around, so that the driving force of the first gear is transmitted to the second gear. However, the second stirring blade remains stopped. Where the third gear is
Idling means that the 3rd gear rotates only on its own axis
Is a state in which the driving force is not transmitted to the second gear. When the contents in the tank start to flow due to the rotation of the first stirring blade,
Since the stirring load is reduced, the degree of idling of the third gear is reduced, and the driving force of the first gear is transmitted to the second gear via the third gear.
It is transmitted to the gear, and the second stirring blade also starts to rotate. When the flow of the contents in the tank becomes more active, the stirring load is further reduced, the degree of idling of the third gear is further reduced, the second stirring blade is gradually accelerated, and the contents in the tank are gradually increased. Is finally homogenized, finally the third gear completely stops rotating and revolving, and the third gear integrally connects the first gear and the second gear,
The first stirring blade and the second stirring blade rotate integrally.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the stirrer according to the present invention will be described below with reference to FIGS. FIG. 1 is a sectional view showing a stirring device according to the present invention. In the figure, reference numeral 1 is
For example, it is a mixing tank for mixing contents such as grains, water, enzymes, etc., and a jacket 2 for temperature control is installed on the lower outer periphery of the mixing tank 1. A drive shaft 3 is arranged in the mixing tank 1, and the drive shaft 3 is connected to a power unit 4 via a pulley 25 and a belt 26 and is rotatably supported by a bearing unit 5.

On the drive shaft 3, an inner blade 6 constituting a first stirring blade is fixed and a first gear 7 which is an external gear is fixed. As shown in FIGS. 2 and 3, a second gear 8 composed of an internal gear is arranged outside the first gear 7 concentrically with the first gear 7. The second gear 8 is held by a pair of upper and lower casings 9 and 10 as shown in FIG. 2, and bearings 11 and 11 are interposed between the casings 9 and 10 and the drive shaft 3. There is. An outer blade 12 forming a second stirring blade is fixed to the second gear 8 (see FIG. 1).

Further, as shown in FIGS. 2 and 3, the first gear 7 and the second gear 8 are provided between the first gear 7 and the second gear 8.
A plurality of third external gears that mesh with the gear 8 respectively.
The gear 13 is arranged. Sliding plates 14 and 15 made of a material having a low friction coefficient are interposed between the third gear 13 and the casings 9 and 10. In addition,
Reference numeral 16 is a shaft sealing device that seals a gap between the casings 9 and 10 and the drive shaft 3.

Next, the operation of the stirrer constructed as described above will be described with reference to FIGS. 1 and 4. An example will be described in which after the contents such as grains, water, and enzymes are filled in the mixing tank 1, the contents are stirred and mixed by a stirrer. When the power unit 4 is driven, the drive shaft 3 is rotationally driven. Along with this, the inner blade 6 integrally provided on the drive shaft 3 is rotationally driven. At the maximum load in the initial stage of stirring, the inner blade 6 rotates with the rotation of the drive shaft 3, and the first gear 7 rotates integrally with the drive shaft 3 as shown by an arrow A in FIG. Since the third gear 13 rotates about its own central axis, that is, rotates (see arrow B) and revolves around the first gear 7 (see arrow C) and idles, the driving force of the first gear 7 is The outer wing 12 remains stopped without being transmitted to the second gear 8. At this time, the third gear 13 moves the sliding plates 14, 15
Slide on. When the contents in the mixing tank 1 start to flow due to the rotation of the inner blades 6, the stirring load decreases, so that the degree of idling of the third gear 13 becomes small, and the driving force of the first gear 7 becomes the third. It is transmitted to the second gear 8 via the gear 13, and the outer blade 12 also starts to rotate. At this time, the casings 9 and 10
Also rotates with the second gear 8.

When the flow of the contents in the mixing tank 1 becomes more active, the stirring load further decreases, the degree of idling of the third gear 13 further decreases, and the outer blades 12 are gradually accelerated. Finally, the third gear 13 completely stops rotating and revolving, and the third gear 13
Connects the first gear 7 and the second gear 8 together as shown in FIG.
As shown by arrows A and D in (b), the first gear 7 and the second gear 8 rotate integrally, and the inner blade 6 and the outer blade 12 rotate integrally. That is, in this embodiment, at the maximum load in the initial stage of stirring, only the inner blade 6 rotates, the outer blade 12 remains stopped, and the rotation of the inner blade 6 causes the contents in the mixing tank 1 to start flowing. When the stirring load decreases, the outer blades 12 also start to rotate, so a large power unit is not required.

FIG. 5 is a sectional view showing a second embodiment of the stirring device of the present invention. In this embodiment, the drive shaft 3 has a first
The outer blade 12 constituting the agitating blade is fixed, and the inner blade 6 constituting the second agitating blade is fixed to the second gear 8. That is, the arrangement of the inner blades 6 and the outer blades 12 is the same as that of the embodiment shown in FIG. 1, but the other configurations are the same as those of the embodiment shown in FIG. In the present embodiment, the outer wing 12
Since the drive shaft 3 is connected to the above, the maximum load in the initial stage of stirring may be larger than that in the embodiment of FIG. 1, but when liquefying and saccharifying grains, the maximum load on the inner peripheral surface of the mixing tank 1 Since it is possible to always stir in a nearby place from the initial stage of stirring to the end of stirring, there is no fear that the contents will be scorched or the like, which is suitable.

Next, a third embodiment of the stirring device of the present invention will be described with reference to FIG. The drive shaft 3 connected to a power unit (not shown) is fixed with an outer blade 12 constituting a first stirring blade and a first gear 17 as a bevel gear. A second gear 18, which is a bevel gear, is arranged at a position facing the first gear 17. Second gear 1
A driven shaft 22 is fixed to the driven shaft 22 and a second shaft is attached to the driven shaft 22.
The inner blade 6 that constitutes the stirring blade of is fixed. Further, a pair of third gears 23, which are bevel gears respectively meshing with the first gear 17 and the second gear 18, are arranged between the first gear 17 and the second gear 18.

The third gear 23 is held by a pair of left and right casings 19, 20.
Bearings 21 and 21 are interposed between 9, 20 and the drive shaft 3 and the driven shaft 22. Reference numeral 16 is a shaft sealing device that seals a gap between the casings 19 and 20 and the drive shaft 3 and the driven shaft 22.

Next, the operation of the stirrer constructed as described above will be described. When a power unit (not shown) is driven, the drive shaft 3 is rotationally driven. Along with this, the outer wing 12 provided integrally with the drive shaft 3 is rotationally driven. At the maximum load in the initial stage of stirring, the outer blades 12 rotate as the drive shaft 3 rotates, and the first gear 17 rotates integrally with the drive shaft 3, but the third gear 2
3 rotates around its own central axis, that is, rotates around the first gear 17 and revolves around the first gear 17 to idle, so that the first gear 1
The driving force of 7 is not transmitted to the second gear 18, and the inner blade 6 remains stopped. When the content in the mixing tank 1 starts to flow due to the rotation of the outer blades 12, the stirring load decreases, so that the degree of idling of the third gear 13 decreases, and the driving force of the first gear 17 decreases to the third. It is transmitted to the second gear 18 via the gear 23, and the inner blade 6 also starts to rotate. At this time, the casings 19 and 20 also rotate together with the third gear 23.

When the flow of the contents in the mixing tank 1 becomes more active, the stirring load is further reduced, the degree of idling of the third gear 23 is further reduced, and the inner blades 12 are gradually accelerated. Finally, the third gear 23 completely stops rotating and revolving, and the third gear 23
Connects the first gear 17 and the second gear 18 integrally, and the inner blade 6 and the outer blade 12 rotate integrally.

Next, the results of experiments conducted to test the effects of the present invention will be described. The specifications of the experimental machine are as follows. Mixing tank: inner diameter 300 mm, capacity 35 (l) First stirring blade (inner blade): inner diameter 160 mm, outer diameter 200 mm,
Thickness 3mm 2nd stirring blade (outer blade): inner diameter 280mm, outer diameter 240mm,
Thickness 3 mm Number of teeth of first gear: 30 Number of teeth of second gear: 60 Number of teeth of third gear: 15 Experimental results In this experimental example, 30 (l) of water at 25 ° C was filled in a mixing tank,
When the first stirring blade (inner blade) and the second stirring blade (outer blade) are combined (corresponding to a conventional stirring device having only one power unit), and the second stirring blade (outer blade) It is a comparative example of the power consumption of the case where the first stirring blade (inner blade) is made free (stirring device of the present invention). FIG. 7 shows the result, in which the horizontal axis represents time (t) and the vertical axis represents motor current consumption. Figure 7
7 (a) and 7 (c) show the results of the stirring blade combination (conventional stirring device), and FIGS. 7 (b) and 7 (d) show the results of the stirring blade free (stirring device of the present invention). It can be seen that the power at the initial stage of stirring is about 1/2 that of the conventional example of the present invention. Further, the time from the maximum load to the steady load is longer in the present invention,
It can be seen that the speed of the second stirring blade (outer blade) is smoothly increased.

[0017]

As described above, according to the present invention,
At the maximum load in the initial stage of stirring, only the first stirring blade is rotated,
Since the second stirring blade can be rotated when the stirring progresses and the stirring load decreases, it is possible to deal with the maximum load at the initial stage of stirring with one power unit having a small output.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a stirring device according to the present invention.

FIG. 2 is an enlarged cross-sectional view of a main part of a stirring device according to the present invention.

3 is a sectional view taken along line III-III in FIG.

FIG. 4 is an operation explanatory view in one embodiment of the stirring device according to the present invention.

FIG. 5 is a sectional view showing a second embodiment of the stirring device according to the present invention.

FIG. 6 is an enlarged sectional view of an essential part showing a third embodiment of the stirring device according to the present invention.

FIG. 7 is a diagram showing a comparative experiment example of the stirring device of the present invention and the conventional stirring device.

[Simple explanation of symbols]

 1 Mixing Tank 2 Jacket 3 Drive Shaft 4 Power Unit 5 Bearing Device 6 Inner Wing 7,17 First Gear 8,18 Second Gear 9,10; 19,20 Casing 11,21 Bearing 12 Outer Blade 13,23 Third Gear 14,15 Sliding plate

Claims (3)

[Claims] 1. A stirrer in which a first stirrer and a second stirrer are concentrically arranged, a drive shaft that holds the first stirrer and is connected to a power unit, and the drive shaft. Of the first gear, a second gear connected to the second stirring blade, and a third gear arranged between the first gear and the second gear. A stirrer characterized in that the driving force is transmitted to the second gear through the third gear and the third gear can revolve around its axis. 2. The stirrer according to claim 1, wherein the first gear and the third gear are external gears, and the second gear is an internal gear. 3. The stirrer according to claim 1, wherein the first gear, the second gear and the third gear are bevel gears.