Variable-frequency drive biochemical special permanent magnet synchronous direct-drive motor and stator encapsulation processing method

Abstract

The application discloses a variable-frequency driving biochemical special permanent magnet synchronous direct-drive motor and a stator sealing and gluing processing method. The motor body is arranged on the top of a reaction kettle. The motor body comprises a motor shell, a rotor and a bearing assembly. The two ends of the rotor are coaxially arranged on the motor shell through the bearing assembly. The bearing assembly comprises a thrust cylindrical roller bearing and a cylindrical roller bearing arranged in sequence along the axial direction. The motor shell is a double-layer closed shell structure. A water cooling cavity is formed between the inner wall and the outer wall of the motor shell. The motor shell is provided with a water inlet and a water outlet which are connected with the water cooling cavity. The motor body is water-cooled and radiated, the working heat can be quickly discharged, and the working stability and safety of the motor body are improved.

Description

Technical Field

[0001] This invention belongs to the field of motors, and specifically relates to a variable frequency drive permanent magnet synchronous direct drive motor for biochemical applications. Background Technology

[0002] With the continuous development of the national biochemical industry, the demand for special motors for biochemical applications is increasing, as shown in the attached... Figure 1 The diagram shows a three-phase asynchronous motor in biochemical reactor and its installation in the reactor. Because the drive motor has a high rotation speed, it cannot generate enough torque to drive the stirring shaft. The drive motor and the reactor shaft need to be decelerated by a belt pulley. The large number of transmission devices leads to a lot of energy loss. Moreover, the high-speed three-phase asynchronous motor has high noise, low power factor, and large reactive power loss. In addition, the motor body generates a lot of heat during operation. If it cannot be dissipated in time, it is very easy to be damaged. Summary of the Invention

[0003] Purpose of the invention: In order to overcome the shortcomings of the existing technology, the present invention provides a variable frequency drive permanent magnet synchronous direct drive motor for biochemical applications, which can reduce energy consumption, significantly improve the power factor, reduce noise, and provide efficient heat dissipation for the motor body.

[0004] Technical solution: To achieve the above objectives, the technical solution of the present invention is as follows:

[0005] A variable frequency drive permanent magnet synchronous direct drive motor for biochemical applications includes a motor body mounted on top of a reactor. The motor body comprises a motor housing, a rotor, and a bearing assembly. The two ends of the rotor are coaxially rotatably mounted on the motor housing via the bearing assembly. The bearing assembly includes thrust cylindrical roller bearings and cylindrical roller bearings arranged sequentially along the axial direction. The motor housing is a double-layered closed structure, with a water-cooling cavity formed between the inner and outer walls of the motor housing. An inlet and an outlet are provided on the motor housing, connecting to the water-cooling cavity.

[0006] Furthermore, the motor body also includes a stator, which is covered with epoxy resin.

[0007] Furthermore, a vibration detection element or a temperature detection element is provided on the bearing assembly facing the reactor side.

[0008] Furthermore, the motor housing includes an inner housing, an outer housing, and a partition. The inner housing and the outer housing form a closed water-cooling cavity. The partition is arranged parallel to the axial direction between the water-cooling cavities. The water inlet and the water outlet are respectively opened on both sides of the partition. Several guide plates are arranged in a circular array parallel to the axial direction inside the water-cooling cavity, and the several guide plates are arranged in an S-shape to form a cooling flow channel.

[0009] Furthermore, it also includes a rotor water-cooling assembly, wherein the rotor includes a shaft, and the top end of the shaft is recessed along the axial direction with a blind hole-shaped mounting cavity, and a water-cooled inner core assembly is disposed in the mounting cavity.

[0010] Furthermore, the water-cooled inner core assembly includes a water-cooling pipe and a supporting inner core that passes through the water-cooling pipe. The supporting inner core is a rod structure with a star-shaped cross-section. The supporting inner core and the water-cooling pipe form a water outlet channel. The supporting inner core is spaced apart from the bottom wall of the mounting cavity. The supporting inner core has an axially extending water inlet channel.

[0011] Furthermore, a sealing seat is fitted around the outer edge of the water-cooling pipe near the water inlet end. The sealing seat is a ring structure with a U-shaped cross section. The opening side of the sealing seat is rotatably sealed to the water-cooling pipe. Several water-cooling outlets are opened on the wall of the water-cooling pipe, which is connected to the inner cavity of the sealing seat, and the water-cooling outlets are connected to the water outlet channel.

[0012] Furthermore, the stator as a whole is sealed with epoxy resin. The sealing process is as follows: the water inlet and outlet of the stator base are plugged with plugs, water pressure is applied to the base and maintained at 1MPa for 5 minutes to ensure that there is no water leakage in the base water channel; the cable outlet of the base is plugged, and a cylindrical fixture is made for the inner hole of the stator. The outer diameter of the fixture is 0.3 to 0.4 mm smaller than the inner hole of the stator on one side, and in the axial direction, it is 15 to 20 mm higher than the end of the coil. A plastic film is inserted between the fixture and the inner hole of the stator. The prepared epoxy resin is poured into the two ends of the stator and waited for the epoxy resin to cure. After demolding, the inner diameter and ends of the stator are machined to remove excess cured epoxy resin.

[0013] Beneficial effects: The motor body of the present invention directly drives the stirring shaft of the reactor to rotate, reducing energy loss, and the motor body is cooled by water cooling chamber, which can quickly dissipate working heat and improve the working stability and safety of the motor body. Attached Figure Description

[0014] Appendix Figure 1 This is a schematic diagram of a biochemical motor in the prior art;

[0015] Appendix Figure 2 This is a schematic diagram of the overall structure of the present invention;

[0016] Appendix Figure 3 This is a half-sectional schematic diagram of the motor body of the present invention;

[0017] Appendix Figure 4 This is a schematic diagram of a half-section of the motor body along direction AA of the present invention;

[0018] Appendix Figure 5 This is an enlarged schematic diagram of part B of the present invention. Detailed Implementation

[0019] The invention will now be further described with reference to the accompanying drawings.

[0020] As attached Figure 2 and attached Figure 3 As shown, a variable frequency drive permanent magnet synchronous direct drive motor for biochemical applications and a stator sealing treatment method are disclosed. The motor body is mounted on the top of a reactor via a motor mounting bracket 1. The motor body is mounted on the motor mounting bracket 1 via a flange 3. The motor body includes a motor housing 15, a rotor 8, and a bearing assembly 5. The two ends of the rotor 8 are coaxially rotatably mounted on end caps 10 of the motor housing 15 via the bearing assembly 5. The end of the rotor 8 corresponding to the reactor is connected to a stirring shaft 11 via a coupling 2. The bearing assembly 5 includes a thrust cylindrical roller bearing and a cylindrical roller bearing arranged sequentially along the axial direction. The shaft extension bearing adopts a double bearing structure using a thrust cylindrical roller bearing and a cylindrical roller bearing. The thrust cylindrical roller bearing bears the axial thrust of the stirring rod, while the cylindrical roller bearing bears the radial unbalanced force of the stirring rod during stirring, allowing the motor shaft extension to withstand thrust in all directions. The motor housing 15 is a double-layered, closed structure. A water-cooling cavity 12 is formed between the inner and outer walls of the motor housing 15, and this water-cooling cavity 12 corresponds to the stator 7. An inlet 13 and an outlet 14 are provided on the motor housing 15, connecting to the water-cooling cavity 12. The flowing water-cooling medium in the water-cooling cavity 12 rapidly conducts and dissipates heat from the motor body, quickly removing operating heat and improving the motor's operational stability and safety.

[0021] The motor body also includes a stator 7, which is covered with epoxy resin. The coil uses anti-corona round copper wire, and the entire stator is sealed with epoxy resin, integrating the coil and stator core into a single unit, significantly enhancing insulation and enabling it to withstand the high humidity environment of biochemical fermentation. The sealing process is as follows: the water inlet and outlet of the stator base are plugged with plugs, water pressure is applied to the base, maintaining a pressure of 1MPa for 5 minutes to ensure no leakage in the base water channels; the wire outlet of the base is plugged, and a cylindrical fixture is made for the stator inner hole, with the outer diameter of the fixture 0.3-0.4mm smaller than the inner hole on one side, and axially 15-20mm higher than the coil end. A plastic film is inserted between the fixture and the stator inner hole, and the prepared epoxy resin is poured into both ends of the stator, waiting for the epoxy resin to cure. After demolding, the inner diameter and ends of the stator are machined to remove excess cured epoxy resin.

[0022] The bearing assembly 5 facing the reactor side is equipped with a vibration detection element or a temperature detection element 4. The temperature detection element 4 is an HN510 wireless vibration and temperature measurement integrated sensor, which is installed on the outer ring of the cylindrical roller bearing. It can detect whether the stirring impeller has fallen off and has a bearing temperature alarm function.

[0023] As attached Figure 3 and attached Figure 4 As shown, the motor housing 15 includes an inner housing 17, an outer housing 18, and a partition 19. The inner housing and the outer housing form a closed water-cooling cavity 12. The partition 19 is arranged parallel to the axial direction between the water-cooling cavities 12. The water-cooling cavities 12 are divided on one side by the partition 19 to form a single-sided flow channel. The water inlet 13 and the water outlet 14 are respectively opened on both sides of the partition 19. Several guide plates 20 are arranged in a circular array parallel to the axial direction in the water-cooling cavity 12, and the several guide plates 20 are arranged in an S-shape to form an S-shaped cooling flow channel.

[0024] As attached Figure 3 To be continued Figure 5 As shown, it also includes a rotor water-cooling assembly. The rotor 8 includes a rotating shaft 16, and the top end of the rotating shaft 16 has a blind hole-shaped mounting cavity 21 recessed along the axial direction. A water-cooled inner core assembly is disposed inside the mounting cavity 21. The water-cooled inner core assembly dissipates heat from the rotating shaft 16 and the inner cavity of the motor body to increase heat dissipation efficiency. The water-cooled inner core assembly includes a water-cooling pipe 22 and a supporting inner core 23 that fits and passes through the water-cooling pipe 22. The supporting inner core 23 is a star-shaped cross-section rod structure. The star-shaped supporting inner core 23 provides internal support for the water-cooling pipe 22, increasing the strength of the water-cooling pipe 22. A water outlet channel 27 is formed between the supporting inner core 23 and the water-cooling pipe 22. The supporting inner core 23 is spaced apart from the bottom wall of the mounting cavity 21. A water inlet channel 24 is opened through the supporting inner core 23 along the axial direction. The water outlet channel 27 and the water inlet channel 24 are connected.

[0025] A sealing seat 25 is fitted around the outer edge of the water-cooled pipe 22 near the water inlet. The sealing seat 25 is a U-shaped annular structure. The opening side of the sealing seat is rotatably sealed to the water-cooled pipe 22 through a sealing ring. The sealing seat 25 is fixed relative to the rotating shaft 16. The water-cooled inner core assembly is fixed relative to the motor body. Several water-cooled outlets 26 are opened on the wall of the water-cooled pipe 22, which is connected to the inner cavity of the sealing seat 25. The water-cooled outlets 26 are connected to the water outlet channel 27, and the cooled liquid after heat conduction is discharged from the water-cooled outlets 26.

[0026] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A variable frequency drive permanent magnet synchronous direct drive motor for biochemical applications, characterized in that: The device includes a motor body mounted on top of the reactor. The motor body comprises a motor housing (15), a rotor (8), and a bearing assembly (5). The two ends of the rotor (8) are coaxially rotatably mounted on the motor housing (15) via the bearing assembly (5). The bearing assembly (5) includes a thrust cylindrical roller bearing and a cylindrical roller bearing arranged sequentially along the axial direction. The motor housing (15) is a double-layered closed shell structure. The inner and outer walls of the motor housing (15) form a water-cooling cavity (12). The motor housing (15) has an inlet (13) and an outlet (14) connected to the water-cooling cavity (12). The motor body also includes a stator (7), which is covered with epoxy resin and the stator (7) is encapsulated with epoxy resin. The epoxy resin can enhance the insulation ability of the stator (7). It also includes a rotor water-cooling assembly. The rotor (8) includes a shaft (16). The top end of the shaft (16) is recessed along the axial direction with a blind hole-shaped mounting cavity (21). A water-cooled inner core assembly is provided in the mounting cavity (21). The water-cooled inner core assembly can dissipate heat from the shaft (16) and the inner cavity of the motor body. The water-cooled inner core assembly includes a water-cooled tube (22) and a supporting inner core (23) that fits and passes through the water-cooled tube (22). The supporting inner core (23) is a rod structure with a star-shaped cross section. The star-shaped supporting inner core (23) can provide internal support for the water-cooled tube (22), thereby increasing the strength of the water-cooled tube (22). The supporting inner core (23) and the water-cooled tube (22) form a water outlet channel (27). The supporting inner core (23) is spaced at the bottom wall of the mounting cavity (21). The supporting inner core (23) has an axially extending water inlet channel (24). The water outlet channel (27) and the water inlet channel (24) are connected.

2. The variable frequency drive permanent magnet synchronous direct drive motor for biochemical applications according to claim 1, characterized in that: Vibration detection element or temperature detection element (4) is provided on the bearing assembly (5) facing the reactor side.

3. The variable frequency drive permanent magnet synchronous direct drive motor for biochemical applications according to claim 1, characterized in that: The motor housing (15) includes an inner housing (17), an outer housing (18), and a partition (19). The inner housing and the outer housing form a closed water-cooling cavity (12). The partition (19) is arranged parallel to the axial direction between the water-cooling cavities (12). The water inlet (13) and the water outlet (14) are respectively opened on both sides of the partition (19). Several guide plates (20) are arranged in a circular array parallel to the axial direction in the water-cooling cavity (12), and the several guide plates (20) are arranged in an S-shape to form a cooling channel.

4. The variable frequency drive permanent magnet synchronous direct drive motor for biochemical applications according to claim 1, characterized in that: The water-cooled pipe (22) has a sealing seat (25) on the outer ring near the water inlet end. The sealing seat (25) is a ring structure with a U-shaped cross section. The opening side of the sealing seat is rotatably sealed to the water-cooled pipe (22). The wall of the water-cooled pipe (22) is provided with several water-cooled outlets (26) that are connected to the inner cavity of the sealing seat (25). The water-cooled outlets (26) are connected to the water outlet channel (27).

5. A variable frequency drive permanent magnet synchronous direct drive motor for biochemical applications according to claim 1, characterized in that: The stator is entirely sealed with epoxy resin. The sealing process is as follows: plug the water inlet and outlet of the stator base with plugs, pressurize the base with water at 1MPa for 5 minutes to ensure no water leakage in the base water channels; plug the cable outlet of the base; make a cylindrical fixture for the inner hole of the stator, the outer diameter of the fixture is 0.3~0.4mm smaller than the inner hole of the stator on one side, and in the axial direction, it is 15~20mm higher than the end of the coil; insert a plastic film between the fixture and the inner hole of the stator; pour the prepared epoxy resin into the two ends of the stator; wait for the epoxy resin to cure; after demolding, machine the inner diameter and ends of the stator to remove excess cured epoxy resin.

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