JPH04129799U - Aeration stirring device - Google Patents

Abstract

(57) [Summary] [Purpose] To provide an aeration stirring device capable of promoting the miniaturization of air bubbles even in a highly viscous fermented liquid to obtain high oxygen supply and stirring and mixing, thereby improving fermentation productivity. [Structure] Air discharge holes 6 are opened at the lower side of a flat stirring blade 4 having a bottom surface shaped along the inner surface of the bottom wall of the fermenter 1, at a position close to its rotational circumference. A single nozzle 5 is provided. Air discharge hole 6 of single nozzle 5
A plurality of protrusions 7 are provided radially from the rotating shaft 2 so that the air discharged from the stirring blades 4 is flapped from above when the stirring blades 4 rotate.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This idea is designed to aerate highly viscous fermented liquids that require aeration in the chemical, pharmaceutical, and food industries. This relates to a stirring device.

0002

[Conventional technology]

Conventionally, there is a device shown in FIG. 4 as a device for aerating and stirring a fermentation liquid. 21 is A fermentation tank containing fermentation liquid F, 22 is a rotating shaft, and 23 is a device provided on the rotating shaft 22 in two stages, upper and lower. disk turbine blade, 25 is a motor for driving the rotating shaft 22, 26 is a flat baffle plate, 27 is a link 28 indicates a tube for air supply. In this device, the mode During the stirring of the fermentation liquid F by the disk turbine blades 23 rotated by the Air sent through tube 28 from a source that does not discharge air from sparger 27 When air bubbles are generated in the fermentation liquid F due to this air discharge, these air bubbles rotate at high speed. The disk turbine blades 23 crush and finely divide the fermentation liquid, and oxygen is dissolved and provided in the fermentation liquid F. be provided.

0003

[Problem that the idea aims to solve]

By the way, in the conventional apparatus as described above, the viscosity of the fermentation liquid F in the fermenter 21 If the amount increases over the course of fermentation, stirring and mixing may become insufficient. This way If stirring and mixing of the highly viscous fermented liquid is insufficient, stir to increase the stirring effect. Instead of the disk turbine blade 23 as a blade, a blade shaped along the inner surface of the bottom wall of the fermenter 21 is used. A plate-shaped anchor blade or gate blade with a bottom surface may be used, but the oxygen supply Viewed from the side, these anchor blades and gate blades are used at low speeds, or Because the blades are relatively large, the air bubbles are physically made finer to provide oxygen. The problem was that it did not have a function to enhance the supply effect. Therefore, this invention eliminates the conventional problems mentioned above and allows even highly viscous fermented liquid to be air-filled. Promotes the miniaturization of bubbles to achieve high oxygen supply and agitation, improving fermentation productivity. The purpose of the present invention is to provide an aeration stirring device that can provide ventilation.

0004

[Means to solve the problem]

In order to achieve the above object, this invention provides the above-mentioned aeration stirring device, The air discharge hole is located on the lower side of the stirring blade, close to its rotating circumference. A ventilation pipe is provided, and the air discharged from the air discharge hole of this ventilation pipe is pumped when the stirring blade rotates. A plurality of protrusions are provided radially from the rotating shaft so as to flap from above.

[0005]

[Effect]

With the above configuration, the air discharged into the fermenter from the air discharge hole of the ventilation pipe is stirred. When the blade rotates, a plurality of protrusions rotate together with the blade, and the protrusion opens the discharge hole. Each time it passes, it flutters above the discharge hole, thereby making the bubbles finer.

[0006]

【Example】

Fig. 1 is a schematic diagram of an aeration stirring device showing an embodiment of this invention, and Fig. 2 is an A-A diagram of Fig. 1. A partially omitted cross-sectional plan view along the line, Figure 3 shows the attachment of protrusions to the stirring blade and rotating shaft. FIG. 3 is a perspective view showing the relationship. In Figures 1, 2, and 3, 1 is a cylindrical container containing fermentation liquid F. In the fermenter, a rotary shaft 2 with a lower end extending to near the bottom wall is mounted in the center of the fermenter 1. It is rotatably supported. A rotating shaft 2 protruding from the top wall of the fermenter 1 A driving motor 3 is connected to. The rotary shaft 2 has an inner surface of the bottom wall of the fermenter 1 A flat plate type stirrer with a contoured bottom surface and suitable for stirring and mixing highly viscous fermentation liquid F. A stirring blade 4 is attached.

[0007] Reference numeral 5 denotes a single nozzle (vent pipe), which is located on the lower side of the stirring blade 4 and whose rotational circumference is An air discharge hole 6 at the tip is provided to open at a position close to. Thing Air is supplied to the nozzle 5 from an air source such as a compressor (not shown) installed outside the tank. They are now being paid. 7 is a part of the rotating shaft 2 near the bottom of the stirring blade 4. These are protrusions provided radially along the bottom surface of the stirring blades 4, and are used for the single nozzle 5. The air discharged from the air discharge hole 6 is blown out from above when the stirring blade 4 rotates. It has become. The protrusion 7 has a curved shape along the inner surface of the bottom wall of the fermenter 1, It does not necessarily have to have such a shape. Also, the attachment of the protrusion 7 to the rotating shaft 2 The location and number of attachments are not limited to what is shown in the diagram, and these can be set arbitrarily during implementation. You can change and modify the meter.

[0008] Such equipment is usually operated continuously at a constant agitation rate and a constant aeration rate. be transferred. During this operation, the air discharged from the discharge hole 6 of the single nozzle 5 is , a plurality of protrusions 7 that rotate together with the stirring blade 4 when the stirring blade 4 rotates, the protrusion Every time the gas passes through the discharge hole 6, it is fluttered above the discharge hole 6, and as a result, fine air bubbles are be converted into

[0009] In order to confirm the effectiveness of this example device, we compared the oxygen dissolution rate under the following conditions. It was. Aeration stirring conditions Tank volume: 2 liters (inner diameter 130mm) Airflow rate: 2 liters/min Liquid: tap water and carboxymethyl cellulose (CMC) aqueous solution Liquid temperature: 30℃ Aeration stirring method Control device: The stirring blade shown in Fig. 3 without the protrusion 7 (blade width = 70mm, blade height = 145mm, 1 blade), 4 baffle plates, single nozzle ventilation. This embodiment device: stirring blade 4 with protrusion 7 shown in FIG. 3 (blade width = 70 mm, Wing height = 145 mm, 1 blade, 6 protrusions 7, diameter of protrusions 7 110 mm), 4 Ventilation with two baffle plates and a single nozzle. The measurement results of the oxygen dissolution rate are expressed as the liquid side oxygen transfer capacity coefficient KLa (h▲superscript-1▼). Shown in 1. In addition, KLa was measured by the sodium sulfite method.

[Table 1] From the above results, it is clear that adding the protrusions 7 improves the oxygen supply (dissolution) performance.

0010 In addition, although the single nozzle 5 was shown as the ventilation pipe in the above embodiment, other For example, it may be a ring-shaped sparger. However, in the case of sparger It is necessary to make the protrusion 7 blow the air discharged from the air discharge hole. .

[0011]

[Effect of the idea]

This device has the above-mentioned configuration, so it is an anchor with a low ability to subdivide bubbles. Even stirring blades suitable for stirring highly viscous fermented liquid, such as blades and gate blades, can reduce air bubbles into fine particles. The effect of this can be obtained. Therefore, high oxygen supply and stirring mixing can be achieved even with highly viscous fermentation liquid. This makes it possible to improve fermentation productivity, which has tended to decline in the past. It has an excellent effect.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of an aeration stirring device showing an embodiment of this invention.

FIG. 2 is a partially omitted cross-sectional plan view taken along line A-A in FIG. 1;

FIG. 3 is a perspective view showing the attachment relationship of the protrusion to the stirring blade and the rotating shaft.

FIG. 4 is a schematic diagram of a conventional aeration stirring device.

[Explanation of symbols]

1 Fermenter 2 Rotating axis 3 motor 4 Stirring blade 5 Single nozzle 6 Air discharge hole 7 Protrusions

Claims (1)

[Scope of utility model registration request] Claim 1: A fermenter, a rotating shaft provided in the center of the fermenter, and a bottom surface shaped along the inner surface of the bottom wall of the fermenter, the rotary shaft being attached to the rotating shaft, In an aeration stirring device equipped with a flat stirring blade that stirs the fermented liquid inside, a ventilation pipe with an air discharge hole is provided at a position near the rotational circumference of the stirring blade on the lower side of the stirring blade. An aeration stirring device characterized in that a plurality of protrusions are provided radially from a rotating shaft so that the air discharged from the air discharge hole of the ventilation pipe is flapped from above when the stirring blade rotates.