Magnetic drive stirring apparatus

Abstract

The application provides a magnetic driving stirring device, which comprises a rotor assembly, a locking nut, a shaft sleeve, an isolation sleeve, an outer magnetic rotor assembly, a bearing body, a driving shaft, a coupling frame and a power mechanism, one end of the isolation sleeve is provided with the rotor assembly and is axially fixed through the locking nut, the other end is connected with the coupling frame, two shaft sleeves are arranged on the mounting body of the isolation sleeve, the rotor assembly comprises an inner magnetic rotor assembly and a stirring rotor, the stirring rotor is installed on the two shaft sleeves through a third bearing and is connected with the inner magnetic rotor assembly, the inner magnetic rotor assembly is arranged outside the isolation sleeve, the driving shaft is installed in the bearing body of the coupling frame through a first bearing and a second bearing, one end of the driving shaft is connected with the power mechanism through a shaft coupling, and the other end is connected with the outer magnetic rotor assembly. The device can meet the leakage-free requirement of high-risk working conditions, improve the wear resistance and axial load of the bearing and meet the high-standard working environment requirement.

Description

[0001] The present application relates to the technical field of stirring devices, and in particular to a magnetic drive stirring device.

[0002] At present, in the medical, biopharmaceutical, chemical, and food processing industries at home and abroad, most container devices have strict sealing requirements to avoid pollution (environmental pollution of the container interior, and pollution of the container interior to the environment). It is difficult to ensure good and long-term sealing of a container equipped with a stirrer during operation.

[0003] At present, the stirrers on the market mainly have mechanical sealing and magnetic sealing. The mechanical sealing stirrer (commonly known as mechanical stirring) adopts a coaxial double mechanical sealing transmission structure, but is still a dynamic seal. The pressure in the tank cannot exceed 2.0 MPa, and it is difficult to be suitable for general chemical purposes. In the magnetic sealing stirrer (commonly known as magnetic stirring), the paddle, stirring shaft, and inner magnetic rotor are connected as a whole, supported by bearings to form a workpiece. The outer magnetic rotor and the speed reducer are connected as a whole to form a power piece, and the workpiece and the power piece are completely isolated by a spacer. During operation, the outer magnetic rotor is driven to rotate by the motor through the speed reducer. Due to the magnetic field between the inner and outer magnetic rotors, the outer magnetic rotor will act on the inner magnetic rotor through magnetic coupling, thereby driving the workpiece (i.e., the stirring shaft) connected to the inner magnetic rotor to rotate synchronously, achieving the purpose of non-contact transmission of torque, and having the superior performance of static sealing. Therefore, it is widely used in conventional working conditions with easy leakage. However, for flammable, explosive, easily leaking, valuable, high-pressure, and high-vacuum working conditions, the working temperature is as high as 300 degrees or more, the working pressure exceeds 2.0 MPa, the material to be stirred needs to be fully and uniformly mixed, and continuous operation cannot have any leakage. The conventional magnetic stirring equipment cannot meet the needs.

[0004] The purpose of the present application is to solve the problems in the prior art and provide a magnetic drive stirring device that can meet the no-leakage requirements of high-risk working conditions, improve the wear resistance and axial load of the bearing, and meet the requirements of high-standard working environments.

[0005] ​​​In order to achieve the above object, the application provides a magnetic driving stirring device, which comprises a rotor assembly, a locking nut, a shaft sleeve, an isolation sleeve, an outer magnetic rotor assembly, a bearing body, a driving shaft, a shaft coupling, a coupling frame and a power mechanism, one end of the isolation sleeve is provided with the rotor assembly and is axially fixed through the locking nut, the other end is connected with the coupling frame, the front end of the isolation sleeve is provided with a mounting body, two shaft sleeves are sleeved on the mounting body, the rotor assembly comprises an inner magnetic rotor assembly and a stirring rotor, the stirring rotor is installed on the two shaft sleeves through the third bearing and is connected with the inner magnetic rotor assembly, the inner magnetic rotor assembly is sleeved outside the isolation sleeve, the bearing body is arranged in the coupling frame, the driving shaft is installed in the bearing body through the first bearing and the second bearing, one end of the driving shaft is connected with the power mechanism through the shaft coupling, the other end is connected with the outer magnetic rotor assembly, and the outer magnetic rotor assembly is arranged inside the isolation sleeve.

[0006] Preferably, the stirring rotor comprises a mounting cylinder, a first flange arranged at one end of the mounting cylinder, and a plurality of stirring blades mounted on the outer periphery of the mounting cylinder, the mounting cylinder is sleeved on the two shaft sleeves through the two third bearings, and the first flange is connected with the inner magnetic rotor assembly through a plurality of connecting bolts.

[0007] Preferably, a plurality of bearing cavity circulation holes are arranged on the mounting cylinder in the circumferential direction, and the bearing cavity circulation holes communicate the cavities between the mounting cylinder and the mounting body.

[0008] Preferably, a plurality of inner magnetic rotor chamber circulation holes are arranged on the first flange, and the inner magnetic rotor chamber circulation holes communicate the cavities between the isolation sleeve and the inner magnetic rotor assembly.

[0009] Preferably, a limiting baffle sleeve is further sleeved on the mounting body, the limiting baffle sleeve is arranged between the two shaft sleeves, one of the shaft sleeves is clamped between the limiting baffle sleeve and the locking nut, and the other shaft sleeve is clamped between the limiting baffle sleeve and the limiting stepped surface of the mounting body.

[0010] Preferably, the two shaft sleeves are arranged in symmetry, a plurality of limiting protrusions are symmetrically arranged on the two end faces of the limiting baffle sleeve, and a limiting groove matched with the limiting protrusions is arranged on the shaft sleeve.

[0011] Preferably, an O-ring is arranged between the locking nut and the shaft sleeve, and an O-ring is arranged between the limiting stepped surface of the mounting body and the shaft sleeve.

[0012] Preferably, a plurality of pins for preventing the third bearing from rotating and axially moving are further arranged on the stirring rotor.

[0013] As preferred, the isolation sleeve comprises an inner isolation sleeve and an outer isolation sleeve, one end of the inner isolation sleeve is provided with a mounting body, the other end is connected with the outer isolation sleeve, the outer isolation sleeve is connected with the connecting frame, and the outer isolation sleeve is provided with an external monitoring interface.

[0014] The present application has the following advantages:

[0015] 1. The present application is a new type of magnetic drive stirring equipment with high torque and double static seal. On the basis of conventional magnetic stirring equipment, the bearing system is optimized and improved. The original ceramic single bearing and single shaft sleeve structure is changed to a high-strength double bearing and double shaft sleeve structure with thrust function. Double isolation sleeves can be used to achieve double static seal. The gap between the inner and outer isolation sleeves can be connected with an external leakage monitoring sensor on the external monitoring interface to realize leakage monitoring function. This not only ensures the no-leakage requirement of high-risk working conditions, but also improves the wear resistance and axial load of the bearing, meeting the high standard requirements such as working temperature up to 300 degrees and working pressure exceeding 2.0 MPa.

[0016] 2. The stirring assembly is optimized and improved. The ordinary stirring shaft is replaced by a thrust bearing with axial thrust function, and a locking nut is used to lock it to reduce the possibility of disengagement during reverse operation, thereby improving the safety of the stirring equipment.

[0017] The features and advantages of the present application will be described in detail with reference to the embodiments and the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a cross-sectional structure diagram of a magnetic drive stirring equipment of the present application using a double isolation sleeve structure;

[0019] Figure 2 is a structure diagram of a rotor assembly of a magnetic drive stirring equipment of the present application;

[0020] Figure 3 is a cross-sectional structure diagram of a magnetic drive stirring equipment of the present application using a single isolation sleeve structure. DETAILED DESCRIPTION

[0021] Referring to Figure 1 and Figure 2The application discloses a magnetic driving stirring equipment, which comprises a rotor assembly 1, a locking nut 2, a shaft sleeve 3, an isolation sleeve 5, an outer magnetic rotor assembly 7, a bearing body 8, a driving shaft 9, a shaft coupling 12, a connecting frame 13 and a power mechanism, one end of the isolation sleeve 5 is provided with the rotor assembly 1 and is axially fixed through the locking nut 2, the other end is connected with the connecting frame 13, a mounting body for mounting the rotor assembly 1 is arranged at the front end of the isolation sleeve 5, a second flange for connecting the connecting frame 13 is arranged at the rear end of the isolation sleeve 5, two shaft sleeves 3 are arranged on the mounting body, the rotor assembly 1 comprises an inner magnetic rotor assembly 101 and a stirring rotor 102, the stirring rotor 102 is mounted on the two shaft sleeves 3 through a third bearing 4 and is connected with the inner magnetic rotor assembly 101, the inner magnetic rotor assembly 101 is arranged outside the isolation sleeve 5, the connecting frame 13 is internally provided with the bearing body 8, the driving shaft 9 is mounted in the bearing body 8 through a first bearing 10 and a second bearing 11, one end of the driving shaft 9 is connected with the power mechanism (a speed reducer and a motor) through the shaft coupling 12, the other end is connected with the outer magnetic rotor assembly 7, and the outer magnetic rotor assembly 7 is arranged inside the isolation sleeve 5. In the embodiment, the first bearing 10 is a rolling bearing 10, the second bearing 11 is a double-row angular contact bearing, and the third bearing 4 is a sliding bearing.

[0022] Further, the stirring rotor 102 comprises a mounting cylinder, a first flange arranged at one end of the mounting cylinder and facing the inner magnetic rotor assembly 101 and a plurality of stirring blades 102a mounted on the outer periphery of the mounting cylinder, the mounting cylinder is arranged on the two shaft sleeves 3 through the two third bearings 4, and the first flange is connected with the inner magnetic rotor assembly 101 through a plurality of connecting bolts.

[0023] Further, a plurality of bearing cavity circulation holes 102b are arranged on the mounting cylinder in a circumferential direction, the bearing cavity circulation holes 102b are connected with the cavities between the mounting cylinder and the mounting body, and the bearing cavity circulation holes 102b are arranged in a slanting manner. Through the bearing cavity circulation holes 102b, it can be ensured that the sliding bearing pair cavities have sufficient medium for cooling and lubrication.

[0024] Further, a plurality of inner magnetic rotor chamber circulation holes 102c are formed in the first flange, and the inner magnetic rotor chamber circulation holes 102c are connected with the cavities between the isolation sleeve 5 and the inner magnetic rotor assembly 101. Due to the pressure difference of the fluid at both ends caused by the stirring paddle, the circulating medium between the isolation sleeve and the inner magnetic rotor accelerates the flow, and the magnetic eddy current heat generated by the alternating magnetic field of the inner and outer magnetic rotor assemblies on the isolation sleeve is taken away, thereby playing a cooling role.

[0025] Further, the mounting body is further sleeved with a limiting sleeve 50, the limiting sleeve 50 is arranged between the two shaft sleeves 3, one of the shaft sleeves 3 is clamped between the limiting sleeve 50 and the locking nut 2, the other shaft sleeve 3 is clamped between the limiting sleeve 50 and the limiting stepped surface of the mounting body, the end of the shaft sleeve 3 away from the limiting sleeve 50 is provided with a limiting protrusion. See Figure 2 In the embodiment, the two shaft sleeves 3 are arranged symmetrically, the limiting sleeve 50 is provided with a flat key, the shaft sleeve 3 is provided with a limiting groove matched with the flat key, for limiting the shaft sleeve 3 in axial and radial directions.

[0026] Further, see Figure 1 The O-ring 6 is arranged between the locking nut 2 and the shaft sleeve 3, and the O-ring 6 is arranged between the limiting stepped surface of the mounting body and the shaft sleeve 3, which has the effect of reducing impact and protecting the shaft sleeve from damage.

[0027] Further, see Figure 1 and Figure 2 The stirring rotor 102 is further provided with a plurality of pins 15 for preventing the third bearing 4 from rotating radially and moving axially.

[0028] Further, see Figure 1 The device is further provided with a disassembly assisting rod 14, which facilitates the decoupling of the inner magnetic rotor assembly 101 and the outer magnetic rotor assembly 7 along the axis during maintenance, avoiding collision caused by strong magnetic interaction. The disassembly assisting rod 14 is installed on the second flange of the isolation sleeve 5, the coupling frame 13 is provided with a guide hole through which the disassembly assisting rod 14 can pass, and the disassembly assisting rod 14 and the guide hole of the coupling frame 13 have a small gap fit, so that the inner and outer magnetic rotor assemblies can be separated along the axial direction during maintenance, avoiding accidental collision caused by radial deviation under the action of magnetic force.

[0029] Further, see Figure 1 In the embodiment, the tail of the locking nut 2 is provided with a connecting screw, the end of the mounting body is provided with an internal thread, and the locking nut 2 is fixedly connected with the mounting body of the isolation sleeve 5 through the connecting screw, for axial fixation, which can prevent the decoupling of the stirring rotor 102 when the axial force is large.

[0030] Further, the isolation sleeve 5 adopts a double isolation sleeve structure, specifically, see Figure 2In the embodiment, the isolation sleeve 5 comprises an inner isolation sleeve 501 and an outer isolation sleeve 502. One end of the inner isolation sleeve 501 is provided with a mounting body, and the other end is connected with the outer isolation sleeve 502. The outer isolation sleeve 502 is connected with the coupling frame 13. The outer isolation sleeve 502 is provided with an external monitoring interface 16, which can be used to install a leakage monitoring sensor. The outer isolation sleeve 502 is provided with a strip-shaped groove, which can be connected with the leakage monitoring sensor installed on the external monitoring interface 16 and the gap between the inner and outer isolation sleeves. When the inner isolation sleeve 501 is worn and broken, there will be a change in pressure, so that the sensor changes the corresponding signal, and the leakage measurement function is realized. Of course, the isolation sleeve 5 can also adopt a single isolation sleeve structure, as shown in Figure 3 The second flange of the isolation sleeve 5 is directly connected with the coupling frame 13.

[0031] The working process of the application is as follows:

[0032] The magnetic drive stirring device of the application works as follows: the motor drives the driving shaft 9 through the speed reducer, so that the outer magnetic rotor assembly 7 rotates. The outer magnetic rotor assembly 7 acts on the inner magnetic rotor assembly 101 through magnetic coupling, and drives the stirring rotor 102 connected therewith to rotate synchronously. The stirring rotor 102 adopts a bearing mounting structure with axial thrust function, and is locked by a locking nut to reduce the possibility of reverse rotation and improve the safety of the stirring device.

[0033] The above embodiments are illustrative of the application, but not limiting. Any simple transformation of the application falls within the protection scope of the application.

Claims

1. A magnetically driven stirring apparatus, characterized by: The utility model relates to a kind of magnetic stirring mechanism, including rotor assembly (1), locking nut (2), shaft sleeve (3), isolating sleeve (5), outer magnetic rotor assembly (7), bearing body (8), drive shaft (9), shaft coupling (12), coupling frame (13) and power mechanism, one end of the isolating sleeve (5) is installed with rotor assembly (1), and is fixed axially by locking nut (2), the other end is connected with coupling frame (13), the front end of the isolating sleeve (5) is equipped with mounting body, the mounting body is equipped with two shaft sleeves (3), the rotor assembly (1) includes inner magnetic rotor assembly (101) and stirring rotor (102), the stirring rotor (102) is installed on two shaft sleeves (3) by third bearing (4), and is connected with inner magnetic rotor assembly (101), the inner magnetic rotor assembly (101) is equipped in the outside of isolating sleeve (5), the coupling frame (13) is equipped with bearing body (8), the drive shaft (9) is installed in bearing body (8) by first bearing (10), second bearing (11), one end of the drive shaft (9) is connected with power mechanism transmission by shaft coupling (12), the other end is connected with the outer magnetic rotor assembly (7), the outer magnetic rotor assembly (7) is arranged in the inside of isolating sleeve (5), the stirring rotor (102) includes installation cylinder, the first flange being arranged in the installation cylinder one end, and a plurality of stirring blades (102a) being installed on the outer periphery of the installation cylinder, the installation cylinder is equipped on two shaft sleeves (3) by two third bearings (4), the first flange is connected with inner magnetic rotor assembly (101) by a plurality of connecting bolts, a plurality of bearing cavity circulation holes (102b) are arranged on the installation cylinder circumferentially, the bearing cavity circulation hole (102b) is connected with the cavity between the installation cylinder and the mounting body, a plurality of inner magnetic rotor chamber circulation holes (102c) are formed in the first flange, and the inner magnetic rotor chamber circulation hole (102c) is connected with the cavity between the isolating sleeve (5) and the inner magnetic rotor assembly (101).

2. A magnetically driven stirring apparatus as claimed in claim 1, characterized in that: The mounting body is also equipped with limit stop sleeve (50), the limit stop sleeve (50) is arranged between two shaft sleeves (3), one of the shaft sleeve (3) is clamped between limit stop sleeve (50) and locking nut (2), and the other shaft sleeve (3) is clamped between limit stop sleeve (50) and the limit step surface of mounting body.

3. A magnetically driven stirring apparatus as claimed in claim 2, characterized in that: Two shaft sleeves (3) are arranged symmetrically, the limit stop sleeve (50) is equipped with a flat key, and the shaft sleeve (3) is provided with a limit groove matched with the flat key.

4. A magnetically driven stirring apparatus as claimed in claim 2, characterized in that: O ring (6) is arranged between the locking nut (2) and the shaft sleeve (3), and O ring (6) is arranged between the limit step surface of the mounting body and the shaft sleeve (3).

5. A magnetically driven stirring apparatus as claimed in claim 1, characterized in that: A plurality of pins (15) are arranged on the stirring rotor (102) to prevent the third bearing (4) from rotating radially and moving axially.

6. A magnetically driven stirring apparatus as claimed in claim 1, characterized in that: The isolating sleeve (5) comprises an inner isolating sleeve (501) and an outer isolating sleeve (502), one end of the inner isolating sleeve (501) is provided with a mounting body, the other end is connected with the outer isolating sleeve (502), the outer isolating sleeve (502) is connected with the connecting frame (13), and the outer isolating sleeve (502) is provided with an external monitoring interface (16).

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