CN107812479B

CN107812479B - Stirring device

Info

Publication number: CN107812479B
Application number: CN201711309446.2A
Authority: CN
Inventors: 宋伟; 朱超云; 胡虹; 李冰峰
Original assignee: Nanjing Polytechnic Institute
Current assignee: DONGGUAN ZHIHE COLOR MASTERBATCH TECHNOLOGY CO.,LTD.
Priority date: 2017-12-11
Filing date: 2017-12-11
Publication date: 2023-09-26
Anticipated expiration: 2037-12-11
Also published as: CN107812479A

Abstract

The invention discloses a stirring device which comprises a driving device, a transmission shaft and a lantern-shaped impeller, wherein one end of the transmission shaft is connected with the driving device, and the other end of the transmission shaft is connected with the impeller. The stirring device can be used for fully mixing and stirring, and has no stirring dead angle, so that the stirring effect is improved.

Description

Stirring device

Technical Field

The invention belongs to the technical field of chemical machinery, and particularly relates to a stirring device.

Background

The stirrer is widely applied to stirring and mixing of various physical and chemical processes in liquid-solid, liquid-liquid, liquid-vapor two-phase and solid-liquid-vapor three-phase media in chemical technology, and the stirring effect has great influence on the physical and chemical processes of the media. The mixer is vertically arranged in the tank body and generally comprises a driving device, a frame, a transmission shaft and an impeller, wherein the impeller rotates along with the transmission shaft to do work on the mixed liquid, and the mixed liquid is mixed and stirred. However, the stirrer of the existing structure has the following problems: because the impeller is at a certain distance from the bottom of the tank body, the stirring effect of the tank bottom is poor, and the physical or chemical process of the medium is influenced; when the tank body is very high, the transmission shaft of the tank body is also lengthened, and when the stirrer works in a rotating way, the winding degree of the transmission shaft is large; when the chemical medium contains fiber substances, the fiber substances are easy to wind on the blades, and the balance of the impeller is affected; the movement mode of the mixed solution is single. These problems all adversely affect the stirring effect.

Disclosure of Invention

The invention provides a stirring device which can be fully mixed and stirred without stirring dead angles, thereby improving the stirring effect.

In order to achieve the above purpose, the technical scheme adopted by the embodiment of the invention is as follows:

the stirring device comprises a driving device, a transmission shaft and a lantern-shaped impeller, wherein one end of the transmission shaft is connected with the driving device, and the other end of the transmission shaft is connected with the impeller.

As a preferred example, the impeller comprises a hub and blades, the hub comprises an upper hub and a lower hub, and the upper hub and the lower hub are connected to form a closed lantern-shaped hollow body; the blade includes upper blade and lower blade, upper blade fixed connection is at the surface of upper wheel hub, and lower blade fixed connection is at the surface of lower wheel hub.

As a preferable example, the stirring device further comprises an upper connecting sleeve, wherein the upper connecting sleeve is positioned at the upper part of the inner cavity of the upper hub, and is fixedly connected with the upper hub, and the upper connecting sleeve is connected with the transmission shaft.

As a preferred example, the stirring device further comprises a lower connecting sleeve, wherein the lower connecting sleeve is positioned at the lower part of the inner cavity of the lower hub, and the lower connecting sleeve is fixedly connected with the lower hub; the lower connecting sleeve is connected with the transmission shaft; the upper connecting sleeve and the lower connecting sleeve are coaxially arranged.

As a preferable example, the upper blades are uniformly arranged on the outer surface of the upper hub, and the number of the upper blades is 4-12; the lower blades are uniformly arranged on the outer surface of the lower hub, and the number of the lower blades is 4-12.

As a preferable example, the upper blades and the lower blades are arranged in a one-to-one correspondence, and the upper blades and the lower blades which are opposite are positioned on the same bus of the impeller.

As a preferable example, the stirring device further comprises a flushing groove, wherein the flushing groove is positioned on the hub, and the flushing groove penetrates through the hub.

As a preferable example, the flushing grooves are uniformly formed on the hub, and the flushing grooves are close to the back surfaces of the blades.

As a preferred example, the stirring device further comprises a frame and a tank body, wherein the frame is connected with the tank body, the driving device is connected with the frame, the impeller is positioned in the tank body, and the transmission shaft penetrates through the frame and is respectively connected with the driving device and the impeller.

As a preferable example, the bottom surface of the inner cavity of the tank body is a concave surface.

Compared with the prior art, the stirring device provided by the embodiment of the invention can be used for fully mixing and stirring, and has no stirring dead angle, so that the stirring effect is improved. The stirring device provided by the embodiment of the invention comprises a lantern-shaped impeller. The middle part of the hub is a parting surface. The rotating impellers drive the water body to spirally roll in different directions above and below the hub parting surface, and convection is generated by the up-and-down movement fluid near the hub parting surface. The stirring device ensures that the medium is fully mixed and stirred, thoroughly eliminates the stirring dead zone, and improves the stirring effect.

Drawings

FIG. 1 is a schematic diagram of an embodiment of the present invention;

fig. 2 is a schematic structural view of a vane in an embodiment of the present invention.

The drawings are as follows: the device comprises a driving device 1, a frame 2, a transmission shaft 3, an impeller 4, an upper connecting sleeve 41, an upper hub 42, upper blades 43, a lower hub 44, a flushing groove 45, lower blades 46, a lower connecting sleeve 47 and a tank body 5.

Detailed Description

The following description is merely exemplary in nature and is not intended to limit the present disclosure, application, or uses. It should be understood that throughout the drawings, corresponding reference numerals indicate like or corresponding parts and features.

As shown in fig. 1 and 2, a stirring device according to an embodiment of the present invention includes a driving device 1, a transmission shaft 3, and a lantern-shaped impeller 4, wherein one end of the transmission shaft 3 is connected to the driving device 1, and the other end of the transmission shaft 3 is connected to the impeller 4.

In the stirring device of this embodiment, the impeller 4 is provided in a lantern shape so that, when the impeller 4 rotates, flows are formed in the upper and lower portions, respectively, and convection is formed at the junction of the upper and lower portions (i.e., the parting surface of the impeller 4). Therefore, the stirring can be fully mixed and stirred, no stirring dead angle exists, and the stirring effect is improved.

The impeller 4 preferably comprises a hub and blades, the hub comprising an upper hub 42 and a lower hub 44, the upper hub 42 and the lower hub 44 integrally forming a closed lantern-shaped hollow body. Preferably, the upper hub 42 and the lower hub 44 are a unitary piece. Preferably, the upper hub 42 and the lower hub 44 cooperate with the drive shaft 3 simultaneously when the hub and the drive shaft 3 are mounted. The diameter of the whole middle of the hub is the largest, and the diameters of the two ends of the hub are gradually reduced respectively. For the upper hub 42, the bottom diameter is the largest and the upward diameter is gradually decreasing. For the lower hub 44, its top surface diameter is greatest and its downward diameter is gradually decreasing. Preferably, the upper hub 42 and the lower hub 44 are symmetrical in shape. The bottom surface of the upper hub 42 and the top surface of the lower hub 44 are joined to form a lantern-shaped hollow body. The hub is of a thin shell structure, and the thickness of the hub is preferably 5-30 mm. The whole hub is a closed body except the flushing groove and the upper end face and the lower end face. The blades include an upper blade 43 and a lower blade 46. The upper blades 43 are fixedly coupled to an outer surface of the upper hub 42. The lower blades 46 are fixedly attached to the outer surface of the lower hub 44. When the stirring device works, the blades rotate along with the hub, so that the stirring effect on the mixture is achieved.

To facilitate the mounting of the impeller 4, the stirring device further comprises an upper connecting sleeve 41. The upper connecting sleeve 41 is positioned at the upper part of the inner cavity of the upper hub 42, the upper connecting sleeve 41 is fixedly connected with the upper hub 42, and the upper connecting sleeve 41 is connected with the transmission shaft 3. The impeller 4 is connected with the transmission shaft 3 in a matched manner by arranging the upper connecting sleeve 41. For example, the upper connecting sleeve 41 is connected with the transmission shaft 3 by a key.

Preferably, the stirring device further comprises a lower connecting sleeve 47, wherein the lower connecting sleeve 47 is positioned at the lower part of the inner cavity of the lower hub 44, and the lower connecting sleeve 47 is fixedly connected with the lower hub 44; the lower connecting sleeve 47 is connected with the transmission shaft 3; the upper 41 and lower 47 connection sleeves are coaxially arranged. The bottom end of the transmission shaft 3 is connected with the lower connecting sleeve 47 in a matching way. For example, the lower connecting sleeve 47 is connected with the transmission shaft 3 through a key, and an external thread is arranged at the tail part of the transmission shaft 3, and a nut is assembled at the tail part of the transmission shaft 3 to fix the hub. The upper hub 42 and the lower hub 44 are respectively connected with the transmission shaft 3 by keys, and the lower end of the lower hub 44 is fixed by nuts. In this way, the transmission shaft 3 is connected with the upper connecting sleeve 41 and the lower connecting sleeve 47 at the same time, which is beneficial to enhancing the reliability of the connection of the impeller 4 and the transmission shaft 3.

As a preferable example, the upper blades 43 are uniformly arranged on the outer surface of the upper hub 42, and the number of the upper blades 43 is 4-12; the lower blades 46 are uniformly arranged on the outer surface of the lower hub 44, and the number of the lower blades 46 is 4-12. More preferably, the upper blades 43 and the lower blades 46 are offset by 0 to 360/2n degrees, n representing the number of upper blades 43. It is further preferred that the upper blades 43 and the lower blades 46 are arranged in a one-to-one correspondence, and that the opposite upper blades 43 and lower blades 46 are located on the same bus of the impeller 4. This ensures continuity of the blade, which is advantageous for improving the stirring effect. When the mixture containing the fiber-like substance is stirred, the fiber-like substance is entangled on the surface of the impeller during the flow. To reduce or avoid entanglement of the fibre-like material, the stirring device further comprises a flushing tank 45. The flushing groove 45 is located on the hub, the flushing groove 45 penetrates the hub, i.e. the flushing groove 45 is a through hole. During the stirring process, the medium in the hub (i.e. the mixed liquid in the hub) is thrown out through the flushing groove 45 on the hub under the action of centrifugal force, and the windings outside the hub are flushed, so that the fibers cannot be wound on the hub. Thus, the surface of the hub is not easily entangled with the fiber-like material by providing the flushing groove 45.

Preferably, the flushing grooves 45 are uniformly arranged on the hub, and the flushing grooves 45 are close to the back of the blade. The blade has a working face and a back face. As the impeller rotates, the mixed liquid in the flushing tank 45 flushes out the windings on the blades.

The stirring device of the above embodiment or preferred example further comprises a frame 2 and a tank 5. The frame 2 is connected with the tank body 5. The driving device 1 is connected with the frame 2. The impeller 4 is located in the tank 5. The transmission shaft 3 passes through the frame 2 and is respectively connected with the driving device 1 and the impeller 4. In this way, the material or mixture to be stirred is introduced into the tank 5, the driving device 1 is started, and the impeller 4 is rotated to stir. Specifically, the working process is as follows: the driving device 1 is started, power is transmitted to the transmission shaft 3 through the frame 2, and the transmission shaft 3 drives the impeller 4 to rotate. Blades arranged on the hub do work on the water body. The diameter of the hub gradually decreases from the hub parting plane (i.e., the interface of the upper hub 42 and the lower hub 44) up or down. When the rotating speed is fixed, the tangential force of the hub is gradually reduced from the parting surface to the top above the parting surface, the resultant force of the tangential force is also gradually reduced, and under the reflection effect of the pool wall, the mixed liquid forms a flowing state of the outer ring from the bottom to the top and the inner ring from the top to the bottom as shown in fig. 1. Under the parting surface, the tangential force of the hub is gradually reduced downwards from the parting surface, the resultant force of the tangential force is also gradually reduced, and under the reflection action of the pool wall, the mixed liquid forms a flowing state of an outer ring from top to bottom and an inner ring from bottom to top as shown in fig. 1. Fluid moving up and down generates strong convection near the parting surface, so that the medium in the whole tank is fully stirred and mixed up, down and middle, dead zones are thoroughly eliminated, and the mixing and stirring effect is effectively improved.

In order to facilitate the flow of the liquid below the parting surface, the bottom surface of the inner cavity of the tank body 5 is preferably concave. This facilitates the flow of the solution in the lower part. Of course, the bottom surface of the inner cavity of the tank body 5 can also be a plane.

The stirring device of the embodiment improves the bearing stress condition in the frame and prolongs the service life of the bearing. In the stirring device of the embodiment, the upper blade and the lower blade in the impeller simultaneously apply work to the mixed liquid, the axial forces generated by the mixed liquid on the stirring device are opposite to each other, the resultant force is the difference between the two axial forces, and the born axial force is very small. Referring to fig. 1, the axial force applied to the upper hub is downward, the axial force applied to the lower hub is upward, the two axial forces are opposite, and the resultant axial force is the difference between the two axial forces.

The stirring effect at the bottom of the impeller of the conventional stirrer is not as good as that at the upper part. The impeller in this embodiment is capable of stirring the liquid below the impeller. In this way, on the one hand, the length of the drive shaft 3 is shortened, and at the same time, the stirring effect of the lower part of the impeller is improved. The length of the transmission shaft 3 is shorter, so that the winding degree of the transmission shaft 3 can be reduced, and the working stability of the stirring device can be improved. According to the length of the transmission shaft and the stirring effect of different parts in the tank, the heights of the upper hub and the lower hub, namely the stirring in an up-down asymmetric manner, can be flexibly set. The parting surface of the hub is used as a reference, the height of the upper hub is different from that of the lower hub, and at the moment, the curved surface shape of the upper hub is different from that of the lower hub. Thus, when the hub rotates, the stirring effect is different between the upper part of the parting surface and the lower part of the parting surface. To enhance the stirring effect of the lower part, the height of the lower hub may be appropriately increased.

The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the specific embodiments described above, and that the above specific embodiments and descriptions are provided for further illustration of the principles of the present invention, and that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined in the appended claims. The scope of the invention is defined by the claims and their equivalents.

Claims

1. The stirring device is characterized by comprising a driving device (1), a transmission shaft (3) and a lantern-shaped impeller (4), wherein one end of the transmission shaft (3) is connected with the driving device (1), and the other end of the transmission shaft (3) is connected with the impeller (4);

the impeller (4) comprises blades and a hub, the hub comprises an upper hub (42) and a lower hub (44), and the upper hub (42) and the lower hub (44) are connected to form a closed lantern-shaped hollow body; the blades comprise an upper blade (43) and a lower blade (46), the upper blade (43) is fixedly connected with the outer surface of the upper hub (42), and the lower blade (46) is fixedly connected with the outer surface of the lower hub (44); the height of the upper hub is different from that of the lower hub, so that the curved surface shape of the upper hub is different from that of the lower hub, and the stirring effect of the upper part of the parting surface is different from that of the lower part of the parting surface when the hubs rotate;

the impeller (4) is arranged in a lantern shape, so that when the impeller (4) rotates, the upper part and the lower part respectively form flow, and convection is formed at the junction of the upper part and the lower part; the mixed liquid forms a flowing state that the outer ring is from bottom to top and the inner ring is from top to bottom above the parting surface; the mixed liquid forms a flowing state that the outer ring is from top to bottom and the inner ring is from bottom to top under the parting surface; the upper blade and the lower blade in the impeller simultaneously apply work to the mixed liquid, the axial force direction received by the upper hub is downward, and the axial force direction received by the lower hub is upward;

the wheel hub also comprises a flushing groove (45), wherein the flushing groove (45) is positioned on the wheel hub, and the flushing groove (45) penetrates through the wheel hub; in the stirring process, under the action of centrifugal force, the medium in the hub is thrown out through a flushing groove (45) on the hub, and the windings on the outer side of the hub are flushed, so that the fiber cannot be wound on the hub.

2. A stirring device as claimed in claim 1, characterized in that it further comprises an upper connecting sleeve (41), said upper connecting sleeve (41) being located in the upper part of the inner cavity of the upper hub (42), and the upper connecting sleeve (41) being fixedly connected to the upper hub (42), the upper connecting sleeve (41) being connected to the drive shaft (3).

3. A stirring device according to claim 2, characterized by further comprising a lower connecting sleeve (47), said lower connecting sleeve (47) being located in the lower part of the inner cavity of the lower hub (44), and the lower connecting sleeve (47) being fixedly connected to the lower hub (44); the lower connecting sleeve (47) is connected with the transmission shaft (3); the upper connecting sleeve (41) and the lower connecting sleeve (47) are coaxially arranged.

4. Stirring device according to claim 1, characterized in that said upper blades (43) are uniformly arranged on the outer surface of the upper hub (42), said upper blades (43) being in a number of 4-12 pieces; the lower blades (46) are uniformly arranged on the outer surface of the lower hub (44), and the number of the lower blades (46) is 4-12.

5. Stirring device according to claim 1, characterized in that the upper blades (43) and the lower blades (46) are arranged in a one-to-one correspondence, and that the opposite upper blades (43) and lower blades (46) are located on the same bus of the impeller (4).

6. Stirring device according to claim 1, characterized in that the flushing grooves (45) are uniformly arranged on the hub, the flushing grooves (45) being close to the back of the blade.

7. A stirring device as claimed in any one of claims 1 to 6, characterized in that it further comprises a frame (2) and a tank (5), said frame (2) being connected to the tank (5), the drive means (1) being connected to the frame (2), the impeller (4) being located in the tank (5), the drive shaft (3) passing through the frame (2) being connected to the drive means (1) and the impeller (4), respectively.

8. A stirring device as set forth in claim 7, characterized in that the bottom surface of the inner cavity of the tank (5) is concave.