CN106367312A - Coaxial double-blade submersible mixer for large fermentation tank - Google Patents

Abstract

The invention relates to a gas-liquid-solid multi-phase mixing device for a fermentation tank, in particular to a coaxial double paddle submersible mixer for a large fermentation tank, which includes a submersible motor, an inner shaft, an outer shaft, a first bevel gear, The second bevel gear and two sets of blades with opposite installation directions, the first bevel gear and the second bevel gear are arranged in the submersible motor and driven by the rotor inside the submersible motor to rotate synchronously, the outer shaft is installed on the submersible motor, and the One end of the outer shaft located inside the submersible motor is fixedly connected to the second bevel gear, one end of the outer shaft located outside the submerged motor is fixedly connected to the first group of blades, the inner shaft is arranged in the outer shaft, and One end of the inner shaft protrudes from the outer shaft and passes through the second bevel gear and is fixedly connected with the first bevel gear, and the other end of the inner shaft extends out of the outer shaft and is fixedly connected with the second set of blades. The invention can realize coaxial reverse paddle stirring, and greatly improves the mixing and stirring effect in the large fermentation tank.

Description

A Coaxial Double Paddle Submersible Agitator for Large Fermentation Tank

technical field

The invention relates to a gas-liquid-solid multiphase mixing device for a fermenter, in particular to a coaxial double paddle submersible agitator for a large fermenter.

Background technique

In bioreactors, biochemical reactions rely on mass transfer to achieve the actual contact between the substrate and microorganisms, and the generation of mass transfer depends on good stirring equipment. At present, in large-scale fermentation tanks, the role of mixing and agitation in promoting the fermentation process is obvious: to fully suspend and disperse solid materials in the feed liquid, to promote uniform mixing of new and old materials, to increase the contact surface with microorganisms, and to avoid solid material deposition or formation. Shell and eliminate the difference in temperature and concentration in the tank, etc. In the fermentation system, mechanical agitation is widely used, mainly including: paddle type, turbine type, propulsion type, anchor type and frame type. In large fermentation tanks, especially in high solid content systems, solid particles suspended in the liquid for a long time require a large circulation flow rate and a good fluid flow pattern, while avoiding excessive shearing of the bacteria, so the structure is simple, The push-type agitator with easy installation and low power has become the first choice for the agitation device of large fermentation tanks.

The submersible mixer is a typical propulsion mixer, in which the paddle is the core component of the agitator. Therefore, the design of the paddle is the basis for the effective mixing of materials in large fermentation tanks. At present, the submersible agitator commonly used at home and abroad is a single-set paddle agitator, that is, a set of paddle blades is installed on a submersible transmission device, and the number of blades is generally two or three. The submersible mixer is fixed on the top or bottom of the liquid surface of the fermentation tank or on the side tank wall through a support frame or a guide rod. In fact, there are some defects in this, mainly in that the form of the paddle does not fully meet the tank structure requirements of the large-scale fermentation tank. On the wall and internal components of the fermentation tank, the solid matter in the fermentation tank will settle or the solids suspended on the liquid surface will be crusted, which will seriously affect the fermentation effect. The paddle form has higher requirements.

Contents of the invention

The object of the present invention is to provide a coaxial double paddle submersible mixer for a large fermentation tank, which has an exquisite structural design, can realize coaxial reverse paddle stirring, and greatly improves the mixing and stirring effect in the large fermentation tank.

The purpose of the present invention is achieved through the following technical solutions:

A coaxial double paddle submersible mixer for a large fermenter, comprising a submersible motor, an inner shaft, an outer shaft, a first bevel gear, a second bevel gear and two sets of paddles installed in opposite directions, the first cone The gear and the second bevel gear are set in the submersible motor and are driven to rotate synchronously by the rotor inside the submersible motor. The outer shaft is installed on the submersible motor, and one end of the outer shaft located in the submersible motor is connected to the The second bevel gear is fixedly connected, the outer shaft is fixedly connected to the first group of blades at one end outside the submersible motor, the inner shaft is arranged in the outer shaft, and one end of the inner shaft extends out of the The outer shaft passes through the second bevel gear and is fixedly connected with the first bevel gear, and the other end of the inner shaft extends out of the outer shaft and is fixedly connected with the second set of blades.

Viewed along the axial direction of the inner rotating shaft, the two groups of paddles are evenly distributed along the circumferential direction and different groups of paddles are arranged alternately.

The first group of blades includes two symmetrically installed blades A, and the second group of blades includes two symmetrically installed blades B.

The front end of the submersible motor is provided with a tapered end cover, a bearing gland is provided outside the end of the tapered end cover, and a supporting part is provided inside the tapered end cover, and the outer rotating shaft is supported by the The part passes through and extends out of the submersible motor, and a double-end mechanical seal is provided at the free end of the support part.

The inner rotating shaft is supported in the outer rotating shaft through the first bearing, and the outer rotating shaft is installed on the submersible motor through the second bearing supporting.

The first bearing is a deep groove ball bearing, and the second bearing is a tapered roller bearing.

The rotor edge inside the submersible motor is provided with two sets of bevel teeth respectively meshing with the first bevel gear and the second bevel gear.

Advantage of the present invention and positive effect are:

1. The present invention realizes the coaxial anti-propeller effect, which greatly improves the push flow effect of the blades, not only balances the rotation and deflection moment of the single blade, but also provides fluid for the second group of blades by the first group of blades, so The second set of paddles has a larger "inlet/discharge flow", which significantly improves the push flow effect on the fluid, and greatly improves the gas-liquid-solid three-phase mixing effect in the large fermentation tank.

2. The sleeve-type rotating shaft formed by the inner rotating shaft and the outer rotating shaft in the present invention can provide a uniform rotation speed for the two groups of blades, which not only ensures the reverse rotation of the two groups of blades, but also realizes the combination of the blades to the greatest extent. potency.

3. The surfaces of the two groups of paddles in the present invention are designed in an arc shape, which conforms to the principle of fluid mechanics, can minimize the resistance generated during the rotation of the paddles, and reduce the power consumption of the motor.

Description of drawings

Fig. 1 is a perspective view of the present invention,

Fig. 2 is the front view of the present invention in Fig. 1,

Fig. 3 is a side view of the present invention in Fig. 1,

Figure 4 is a schematic diagram of the installation of the bearing gland in Figure 1,

Fig. 5 is a schematic diagram inside the end cover of the submersible motor in Fig. 1,

Fig. 6 is a schematic diagram of transmission inside the submersible motor in Fig. 1 .

Among them, 1 is the blade A, 2 is the blade B, 3 is the submersible motor, 4 is the bearing gland, 5 is the inner shaft, 6 is the outer shaft, 7 is the first bearing, 8 is the second bearing, and 9 is the support 10 is the double-end mechanical seal, 11 is the first bevel gear, 12 is the second bevel gear, and 13 is the rotor.

detailed description

The present invention will be described in further detail below in conjunction with the accompanying drawings.

As shown in Figures 1 to 6, the present invention includes a submersible motor 3, an inner shaft 5, an outer shaft 6, a first bevel gear 11, a second bevel gear 12 and two sets of blades with opposite installation directions, as shown in Figure 6, The first bevel gear 11 and the second bevel gear 12 are arranged inside the submersible motor 3, and the rotor 13 edge inside the submersible motor 3 is provided with two sets of bevel teeth respectively connected with the first bevel gear 11 and the second bevel gear. The gears 12 mesh, the first bevel gear 11 and the second bevel gear 12 are driven to rotate synchronously by the inner rotor 13 of the submersible motor 3, the outer shaft 6 is installed on the submersible motor 3, and the outer shaft 6. One end located inside the submersible motor 3 is fixedly connected to the second bevel gear 12, and one end of the outer rotating shaft 6 located outside the submersible motor 3 is fixedly connected to the first group of blades. The inner rotating shaft 5 is arranged on the In the outer rotating shaft 6, and one end of the inner rotating shaft 5 protrudes from the outer rotating shaft 6 and passes through the second bevel gear 12 to be fixedly connected with the first bevel gear 11, and the other end of the inner rotating shaft 5 extends out The outer rotating shaft 6 is fixedly connected with the second group of blades afterwards.

As shown in Figures 1-3 and Figure 6, viewed along the axial direction of the inner shaft 5, the two groups of paddles are evenly distributed along the circumferential direction and different groups of paddles are alternately arranged, the two groups of paddles The structure is the same. In this embodiment, the first group of blades includes two symmetrically installed blades A1, and the second group of blades includes two symmetrically installed blades B2. When installing, it is necessary to ensure that each group of blades The direction of fluid motion during operation is the direction of the paddles. Since the two sets of paddles are installed in opposite directions, the direction of the vortex formed by the two sets of paddles is also opposite when the device is running.

As shown in Figure 4, the front end of the submersible motor 3 is provided with a tapered end cover, and a bearing gland 4 is provided outside the end of the tapered end cover, as shown in Figure 5, on the tapered end cover A support portion 9 with a through hole is provided inside, and the outer rotating shaft 6 passes through the through hole on the support portion 9 and extends to the outside of the submersible motor 3, and a double end surface is provided at the free end of the support portion 9 The mechanical seal 10 effectively ensures the internal sealing of the submersible motor 3 .

As shown in Figure 4, the inner shaft 5 is supported and installed in the outer shaft 6 through the first bearing 7, and as shown in Figure 5, the outer shaft 6 is supported and installed in the outer shaft 6 through the second bearing 8. On the submersible motor 3, in this embodiment, the first bearing 7 is a deep groove ball bearing, and the second bearing 8 is a tapered roller bearing.

Working principle of the present invention is:

Due to the installation of two sets of paddles with opposite directions, the present invention realizes the coaxial anti-paddle effect, greatly improves the pushing effect of the paddles, not only balances the rotational deflection moment of a single blade, but also the first set of paddles is the second The second set of blades provides fluid, so the second set of blades has a larger "inlet/discharge flow". Under the same output power, it can achieve a larger circulation flow and significantly improve the effect of pushing the fluid. , to homogenize the medium in the large fermenter, generate suspension flow or maintain the horizontal flow of the medium, which greatly improves the gas-liquid-solid three-phase mixing and stirring effect in the large fermenter. In the present invention, the sleeve-type rotating shaft formed by the inner rotating shaft 5 and the outer rotating shaft 6 can provide a uniform rotation speed for the two groups of blades, which not only ensures the reverse rotation of the two groups of blades, but also maximizes the combination of the blades potency. The surface of the two sets of blades is designed in an arc shape, which conforms to the principles of fluid mechanics, can minimize the resistance generated during the rotation of the blades, and reduce the power consumption of the motor. The distance between the two sets of paddles not only ensures the smooth rotation of the paddles, but also provides space for the fluid to enter/discharge, ensuring the maximum efficiency between the paddle combinations.

Claims (7)

1. a kind of coaxial double-oar submersible agitator for large fermentation tank it is characterised in that: include submersible motor (3), interior turn Axle (5), outer shaft (6), first bevel gear (11), second bevel gear (12) and the contrary blade of two groups of installation directions, described One bevel gear (11) and second bevel gear (12) are arranged in submersible motor (3) and by internal the turning of described submersible motor (3) Sub (13) drive synchronous rotary, and described outer shaft (6) is arranged on described submersible motor (3), and described outer shaft (6) is located at and dives One end in hydroelectric machine (3) is connected with described second bevel gear (12), and described outer shaft (6) is located at described submersible motor (3) outward One end be connected with first group of blade, described interior rotating shaft (5) is arranged in described outer shaft (6), and described interior rotating shaft (5) one end Stretch out described outer shaft (6) and pass through described second bevel gear (12) to be connected with described first bevel gear (11) afterwards, described interior turn Axle (5) other end is stretched out described outer shaft (6) and is connected with second group of blade afterwards.

2. the coaxial double-oar submersible agitator for large fermentation tank according to claim 1 it is characterised in that: along institute The axial direction stating interior rotating shaft (5) is looked, and described two groups of blades are circumferentially uniform and blade of different group is arranged alternately.

3. the coaxial double-oar submersible agitator for large fermentation tank according to claim 1 and 2 it is characterised in that: institute State first group of blade and include the blade a (1) that two panels is symmetrically installed, described second group of blade includes the blade b that two panels is symmetrically installed (2).

4. the coaxial double-oar submersible agitator for large fermentation tank according to claim 1 it is characterised in that: described latent Hydroelectric machine (3) front end is provided with conical head, is provided with bearing gland (4), in described taper outside the end of described conical head Cover internal is provided with a support (9), and described outer shaft (6) is by described support (9) through and out to submersible motor (3) Outward, the free end in described support (9) is provided with double mechanical seal (10).

5. the coaxial double-oar submersible agitator for large fermentation tank according to claim 1 it is characterised in that: described interior Rotating shaft (5) is passed through described clutch shaft bearing (7) supporting and is arranged in described outer shaft (6), and described outer shaft (6) passes through described second Bearing (8) supporting is arranged on described submersible motor (3).

6. the coaxial double-oar submersible agitator for large fermentation tank according to claim 5 it is characterised in that: described One bearing (7) is deep groove ball bearing, and described second bearing (8) is taper roll bearing.

7. the coaxial double-oar submersible agitator for large fermentation tank according to claim 1 it is characterised in that: described latent Internal rotor (13) edge of hydroelectric machine (3) be provided with two groups of conical tooths respectively with described first bevel gear (11) and second bevel gear (12) engage.