JPS63171627A - Motor driven agitator - Google Patents

Abstract

PURPOSE:To raise reliability for the airtightness of a vessel by providing a liquid passage flowing through along the axial direction of a rotor, blades forcedly circulating the reaction liquid in a vessel through said liquid passage, and a casing forming a cooling wind passage surrounding a stator. CONSTITUTION:Electric current is supplied to the stator 20 and cooling wind is flowed from and inlet opening 24 to the casing 16, and is discharged from an outlet opening 26. By the excitation of the stator 20, the rotor 28 is revolved with a result that the blades 36, 28 send the reaction solution in the vessel 10 upward. Consequently, the reaction solution is flowed downward through a liquid passage 32 of the revolving shaft 30, and is forcedly circulated upward through through-holes 52, blades 36, liquid passages 34, blades 38 and through- holes 54. The reaction solution is also agitated by agitating blades 58. The stator 20 and a partition 18 is forcedly cooled by the wind flowing in a cooling wind passage 22, and the rotor 28 is forcedly cooled by the reaction solution.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to an electric stirrer.

(Background of the Invention) For example, there are conventional bioreactors in which a reaction solution is reacted while being stirred in a container to promote an enzyme reaction or the like. In this type of bioreactor, it is necessary to prevent bacteria from entering the reaction solution, and in particular, in the case of an anaerobic reaction, it is required to ensure isolation from the atmosphere. In addition, in the case of a pressurized reaction, leakage of the reaction solution must be reliably prevented. For this reason, if the stirring blade inside the container is driven from outside the container via a rotating shaft that penetrates the bottom of the solution or the lid, the seal of this rotating shaft will come into contact with the reaction solution, which poses a risk of bacteria invading. Not only does this increase, but also the airtight reliability decreases due to wear of the seal, which is undesirable.

Conventionally, a stator is placed on the outside of the container, and a rotor is placed on the inside of the container.The stator and rotor form a rotating electric motor, and stirring blades are attached to the rotor. It has been proposed (for example, Utility Model Act 53-17)
No. 019, JP-A-51-150158, JP-A-51-
150159, Japanese Utility Model Application Publication No. 58-124230, Japanese Utility Model Application Publication No. 59-52519, and Japanese Utility Model Application Publication No. 60-100027).

On the other hand, when the stator and rotor are arranged with the container in between, the reaction temperature inside the container tends to rise due to the heat generated by the stator and rotor, making it difficult to control the reaction temperature. A problem arises.

(Purpose of the Invention) The present invention was made in view of the above circumstances, and when used in a bioreactor, etc., there is no fear of bacteria intrusion, the container has high airtight reliability, and the reaction temperature can be easily controlled. The purpose of the present invention is to provide an electric stirrer that can perform the following operations.

(Structure of the Invention) According to the present invention, this object is achieved by forming at least a part of the container from a non-magnetic material, and disposing a stator and a rotor on the outside and inside of the container, respectively, with the non-magnetic material part in between. In an electric stirrer in which a stirring blade is attached to the rotor, and a rotary motor is formed by the stator and the rotor, a liquid passage passing through the rotor in the axial direction and a liquid passage fixed to the rotor are provided. This is achieved by an electric stirrer characterized by comprising an impeller that forcibly circulates the reaction solution in the container through a liquid passage, and a casing that surrounds the stator and forms a cooling air flow path.

(Example) Figure i1 is a side sectional view of one embodiment of the present invention.

In this figure, reference numeral 10 denotes a reaction vessel, and an opening 12 and a flange 14 are integrally formed at the bottom of the reaction vessel.

A casing 16 is fixed to the lower surface of this flange 14. That is, this casing 16 includes an upper plate 16A, a casing body 16B, a lower plate 16A, and a bottom! It is made of 16D. The upper plate 16A and the lower plate 16C are formed in an annular shape, and a partition wall 18 is liquid-tightly fixed between their inner peripheral edges. This partition wall 18 is made of a non-magnetic material such as non-magnetic stainless steel, ceramics, synthetic resin, etc., which can be penetrated by a magnetic field.

A stator 20 is attached to the outer peripheral surface of the partition wall 18.

Furthermore, a cooling air passage 22 surrounding the stator 20 is formed within the casing 16 . Note that an inlet 24 and an outlet 26 for cooling air are formed in the casing body 16B.

28 is a rotor, and this rotor 28 has a liquid passage 32 passing through the stainless steel rotating shaft 30 in the axial direction, and a plurality of liquid passages 3 passing through the rotor 28 in the axial direction at positions eccentric from the center.
4 is formed. In addition, the rotating shaft 30 has a liquid passage 34.
Two impellers 36, 38 are fixed close to both openings. This impeller 36, 38 is made of stainless steel.

A lower bracket 4 is connected to the lower end of the rotating shaft 30 via a bearing 40.
2 is attached, and an upper bracket 46 is attached to the upper end of the rotating shaft 30 via a bearing 44. These bearings 4
0.44 and bracket 42.46 are made of stainless steel or ceramics. The lower bracket 42 is attached to the partition wall 1
The upper bracket 46 is made to have a smaller diameter than the inner diameter of the partition wall 18, and the upper bracket 46 has a larger diameter than the inner diameter of the partition wall 18. Furthermore, fixed vanes 48.50 facing the impeller 36.38 and through holes 52.54 are formed in both brackets 42.46. Note that the entire outer surface of the rotor 28 and the three-layer passage 3
4 The inner surface is sealed with a thin stainless steel plate, and the structure is similar to the rotor of a so-called ice motor.

In this way, the lower bracket 42 and the upper bracket 46 are preassembled on the rotor 28, and this preassembly is inserted into the casing 16 from inside the container 10 through the opening 12, and the lower bracket 42 is locked to the bottom if 6D. On the other hand,
The upper bracket 46 is locked to the upper plate 16A. The rotor 28 is assembled into the casing 16 by fixing the upper bracket 46 to the upper plate 16A with screws 56.

As a result, stator 20 and rotor 28 form an AC induction motor with partition wall 18 in between. That is, current is supplied from an external power supply circuit to the coils of the stator 20 to form a rotating magnetic field and cause the first rotor 20 to generate rotational force. Note that a stirring blade 58 is fixed to the upper end of the rotating shaft 30 of the rotor 20.

In this embodiment, current is supplied to the coils of the stator 20, while cooling air is supplied to the casing 16 from the inlet 24 and flows out from the outlet 26. Excitation of the stator 20 causes the rotor 28 to rotate. For this reason, the impeller 36.
38 sends the reaction solution in the container 10 upwards. Therefore, the reaction solution descends from the liquid passage 32 of the rotating shaft 30 and enters the through hole 52.
1 impeller 36, liquid passage 34, impeller 38 and through hole 5
4 and is forced to circulate upward. Further, this reaction solution is further stirred by a stirring blade 58.

While the rotor 28 is rotating, the rotor 28 and stator 20 generate heat, but the stator 20 and the partition wall 18 are connected to the cooling air passage 22.
The rotor 28 is forcedly cooled by the cooling air passing through it.
is cooled by the reaction solution. In addition, the reaction solution is
It is also cooled by cooling air through the . As a result, the reaction temperature can be controlled by the temperature and flow rate of the cooling air.

In this example, it has been explained that the reaction temperature is prevented from increasing by supplying cooling air, but on the contrary, the reaction temperature can be controlled at a high temperature by setting the cooling air temperature high. It also includes things.

Furthermore, the electric motor formed by the stator and rotor is not limited to an induction motor, and of course may be other electric motors such as a permanent magnet motor.

(Effects of the Invention) As described above, the present invention forms a rotating electric motor with the rotor and stator disposed through the partition wall, so the inside of the container can be made airtight, and there is no risk of germs entering. The airtightness of the container is highly reliable. Furthermore, since cooling air passages were formed in the casing surrounding the stator, the temperature of the reaction solution could be controlled. Furthermore, since an axial liquid passage and an impeller are provided in the rotor to eliminate stagnation of the reaction solution, there is less annihilation of viable bacteria and the reaction can proceed smoothly.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of one embodiment of the present invention. DESCRIPTION OF SYMBOLS 10... Container, 16... Casing, 18... Partition wall, 20... Stator, 22... Cooling air passage 28... Rotor 32.34... Liquid passage, 36.38 ... Impeller, 58... Stirring blade. Patent Applicant Food Industry Bioreactor System Technology Research Association Representative Patent Attorney Yama 1) Yu Moon Figure 1

Claims (1)

[Scope of Claims] At least a portion of the container is formed of a non-magnetic material, a stator and a rotor are respectively disposed on the outside and inside of the container with the non-magnetic material portion sandwiched therebetween, and the rotor is provided with a stirrer. In an electric stirrer in which a rotary motor is formed by a stator and a rotor, the blades are attached, and a liquid passageway that passes through the rotor in the axial direction, and a liquid passageway that is fixed to the rotor and flows into the container through the liquid passageway. An electric stirrer comprising: an impeller for forcibly circulating the reaction solution; and a casing surrounding the stator and forming a cooling air flow path.