A permanent magnet direct drive motor and flotation equipment

Abstract

This utility model discloses a permanent magnet direct drive motor and flotation equipment, relating to the technical field of flotation equipment. It includes a hollow shaft and a vent pipe. The vent pipe is fixed at the air inlet end of the hollow shaft. The central through hole of the hollow shaft is coaxially connected to the air inlet hole of the vent pipe, which guides high-temperature air into the central through hole. Several cooling pipes are fixedly installed on the vent pipe. The cooling holes of the cooling pipes intersect with the air inlet hole. The cooling medium in the cooling holes exchanges heat with the high-temperature compressed air in the air inlet hole, cooling the high-temperature compressed air in the air inlet hole. This effectively blocks the direct conduction path of the high-temperature compressed air to the motor rotor and permanent magnet, reducing the thermal expansion and deformation of the hollow shaft and its surrounding components. This avoids performance degradation of the permanent magnet or failure of insulating components due to heat accumulation, thereby improving the reliability of the permanent magnet direct drive motor under continuous high-load operation.

Description

Technical Field

[0001] This utility model relates to the field of flotation equipment technology, and in particular to a permanent magnet direct drive motor and flotation equipment. Background Technology

[0002] Flotation equipment is a key piece of equipment that separates minerals based on differences in the physicochemical properties of their surfaces. It can effectively separate useful minerals such as iron, manganese, gold, silver, copper, lead, and zinc, and is widely used in environmental protection, metallurgy, papermaking, chemical industry, and pharmaceuticals.

[0003] During the flotation process, the slurry is often highly corrosive and poses a risk of leakage, which can severely damage mechanical transmission components. To address this issue, flotation equipment commonly employs a permanent magnet direct-drive motor, in which high-temperature compressed air (approximately 70–80°C) is introduced through an empty shaft to assist the flotation process. By eliminating traditional transmission components, the equipment's compactness is improved.

[0004] However, when high-temperature compressed air passes through the hollow shaft of the permanent magnet direct drive motor, it directly heats the rotor, causing the operating temperature of the permanent magnet to rise. The high temperature not only causes the performance of the permanent magnet to drop sharply, but in severe cases, it may also cause irreversible demagnetization of the permanent magnet, or even cause accidents such as motor burnout, thus seriously affecting the reliability of the permanent magnet direct drive motor. Utility Model Content

[0005] The purpose of this invention is to provide a permanent magnet direct drive motor and flotation equipment. A vent pipe is added to the air inlet end of the hollow shaft, and a cooling pipe is installed inside the vent pipe. This allows the cooling medium inside the cooling pipe to exchange heat with the high-temperature compressed air inside the vent pipe, reducing the temperature of the high-temperature compressed air flowing into the hollow shaft. This improves the reliability of the permanent magnet direct drive motor under continuous high-load operation and solves the technical problem of decreased reliability of existing permanent magnet direct drive motors due to excessive hollow shaft temperature.

[0006] To achieve the above objectives, this utility model provides a permanent magnet direct drive motor, including a hollow shaft and a vent pipe. The vent pipe is fixed at the air inlet end of the hollow shaft, and the central through hole of the hollow shaft is coaxially connected with the air inlet through hole of the vent pipe. The air inlet through hole is used to guide high-temperature air into the central through hole.

[0007] The vent pipe is fixed with several cooling pipes. The cooling through holes of the cooling pipes intersect with the air inlet through holes. The cooling medium in the cooling through holes exchanges heat with the high-temperature compressed air in the air inlet through holes.

[0008] In some embodiments, the centerlines of the cooling pipe and the vent pipe are perpendicular to each other.

[0009] In some embodiments, the cooling pipe has a circular or square cross-section.

[0010] In some embodiments, a plurality of heat dissipation fins are fixedly provided on the outer wall of the cooling pipe.

[0011] In some embodiments, the vent pipe is provided with mounting holes, both ends of the cooling pipe are fitted with the mounting holes, and a sealing ring is provided between the cooling pipe and the mounting holes.

[0012] In some embodiments, a connecting flange is fixedly provided at one end of the vent pipe facing the hollow shaft, and the connecting flange is fixedly connected to the air inlet end by fastening bolts.

[0013] In some embodiments, a sealing gasket is provided between the connecting flange and the air intake end face of the hollow shaft.

[0014] In some embodiments, the device further includes a housing and a cooling shroud fixed to the end of the housing. The cooling shroud has a cooling cavity, and a vent pipe is located inside the cooling cavity. An air supply pipe is fixed outside the cooling shroud, and a cooling fan is fixed to the air supply pipe. The cooling fan is used to drive the cooling medium to circulate within the cooling cavity.

[0015] In some embodiments, a temperature sensor is also provided in the central through hole of the hollow shaft. The temperature sensor is used to detect the current temperature of the central through hole. Both the temperature sensor and the cooling fan are connected to the controller. The controller is used to adjust the speed of the cooling fan when the current temperature of the central through hole exceeds a set temperature, based on the signal sent by the temperature sensor.

[0016] This utility model also provides a flotation device, including the aforementioned permanent magnet direct drive motor.

[0017] Compared to the prior art, this utility model optimizes the permanent magnet direct drive motor, including a hollow shaft and a vent pipe. The vent pipe is fixed at the air inlet end of the hollow shaft, and the central through hole of the hollow shaft is coaxially connected with the air inlet through hole of the vent pipe. The air inlet through hole is used to guide high-temperature air into the central through hole. Several cooling pipes are fixedly mounted on the vent pipe, and the cooling through holes of the cooling pipes intersect with the air inlet through hole.

[0018] When high-temperature compressed air enters the central through-hole of the hollow shaft through the intake through-hole, it exchanges heat with the cooling medium in the cooling through-hole, cooling the high-temperature compressed air in the intake through-hole. This effectively blocks the direct conduction path of the high-temperature compressed air to the motor rotor and permanent magnet, reduces the thermal expansion and deformation of the hollow shaft and its surrounding components, and avoids the performance degradation of the permanent magnet or the failure of insulation components due to heat accumulation, thereby improving the reliability of the permanent magnet direct drive motor under continuous high load operation conditions. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0020] Figure 1 This is a front view of a permanent magnet direct drive motor provided in an embodiment of the present invention;

[0021] Figure 2 for Figure 1 A cross-sectional view of the assembly of the central vent pipe and the cooling pipe;

[0022] Figure 3 for Figure 1 A schematic diagram of the assembly of the central air duct and the cooling pipe.

[0023] The attached figures are labeled as follows:

[0024] Hollow shaft 1, vent pipe 2, cooling pipe 3, outer shell 4, cooling cover 5, and cooling fan 6;

[0025] Air intake port 21 and connecting flange 22;

[0026] Cooling through hole 31;

[0027] Cooling chamber 51 and air supply pipe 52. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] This utility model discloses a permanent magnet direct drive motor, as shown in the attached figure. Figure 1As shown, the device includes a hollow shaft 1 and a vent pipe 2. The hollow shaft 1 has a hollow structure, which reduces its rotational inertia and decreases inertial resistance during startup, acceleration, or speed change, thus improving the dynamic response performance of the motor. One end of the hollow shaft 1 is the output end, which has a keyway and is connected to the load via a key, enabling reliable torque transmission from the motor rotor to the load. The other end of the hollow shaft 1 is the air delivery end, allowing high-temperature compressed air to enter the central through hole from the inlet end.

[0031] As attached Figure 1 As shown, the vent pipe 2 is fixed to the air inlet end of the hollow shaft 1, establishing a stable air path connection between the external air source and the central through hole. This ensures that the connection between the vent pipe 2 and the hollow shaft 1 does not become relatively loose or leak during motor rotation or vibration, thereby improving the sealing reliability of the high-temperature compressed air. The vent pipe 2 is coaxially arranged with the hollow shaft 1, allowing the high-temperature compressed air to flow in a straight axial direction when entering the central through hole from the external air source. This avoids local turbulence, pressure fluctuations, or energy loss caused by eccentricity or bending, thereby reducing intake resistance and pressure loss, and minimizing additional vibration or unbalanced torque caused by eccentric airflow impact, thus improving the smoothness of motor operation. Correspondingly, the central through hole of the hollow shaft 1 is coaxially connected with the air inlet through hole 21 of the vent pipe 2. The air inlet through hole 21 is used to guide high-temperature air into the central through hole, ensuring that the transition surface between the two sections of the channel is smooth and continuous. This helps to reduce the turbulence of high-temperature compressed air at the interface, maintain the laminar flow stability of the airflow, and avoid energy dissipation or abnormal temperature rise caused by local turbulence.

[0032] As attached Figure 2 and 3 As shown, the vent pipe 2 is fixed with several cooling pipes 3, and the cooling through holes 31 of the cooling pipes 3 intersect with the air inlet through hole 21. When high-temperature compressed air enters the central through hole of the hollow shaft 1 through the air inlet through hole 21, it exchanges heat with the cooling medium in the cooling through hole 31, cooling the high-temperature compressed air in the air inlet through hole 21. This effectively blocks the direct conduction path of high-temperature compressed air to the motor rotor and permanent magnet, reduces the thermal expansion and deformation of the hollow shaft 1 and its surrounding components, and avoids the performance degradation of the permanent magnet or the failure of insulation components due to heat accumulation, thereby improving the reliability of the permanent magnet direct drive motor under continuous high load operation conditions.

[0033] As a preferred embodiment, as shown in the appendix Figure 3As shown, all cooling pipes 3 are arrayed on the vent pipe 2, increasing the contact area between the cooling medium and the air inlet vent 21, allowing the cooling medium to more fully absorb the heat from the vent pipe 2 and the high-temperature compressed air inside, thereby effectively improving heat dissipation efficiency. In addition, the arrangement avoids local overheating concentration, making the temperature gradient inside the vent pipe 2 more gradual, improving heat exchange uniformity, reducing the risk of deformation or cracking caused by thermal stress concentration, and helping to maintain the structural strength and sealing performance of the vent pipe 2, ensuring the integrity and reliability of the air circuit connection under high-temperature conditions.

[0034] As a preferred embodiment, as shown in the appendix Figure 2 As shown, the cooling pipe 3 penetrates the ventilation pipe 2 radially. The centerlines of the cooling pipe 3 and the ventilation pipe 2 are perpendicular to each other, allowing the cooling medium to pass directly through the interior of the ventilation pipe 2 in a transversely intersecting manner. This forms a forced heat exchange with the flowing high-temperature compressed air. By guiding the radial flow of the cooling medium, the thermal boundary layer that develops along the axial direction of the ventilation pipe 2 is effectively broken, causing the boundary layer to thin. This reduces the thermal resistance of the heat exchange surface and increases the local convective heat transfer coefficient, thereby improving the heat dissipation effect of the high-temperature compressed air inside the ventilation pipe 2.

[0035] As a preferred embodiment, as shown in the appendix Figure 2 As shown, the cross-section of cooling pipe 3 is either circular or square. The circular cross-section has a smooth inner wall without dead flow corners, which helps reduce the flow resistance of the cooling medium and uniformly bears the internal and external pressure differences in all directions, making it suitable for high-speed cooling conditions. The square cross-section provides a larger heat exchange area within the same external dimensions, which helps enhance the heat exchange between the cooling medium and cooling pipe 3. Both cross-sectional forms address the cooling requirements of low flow resistance and high throughput, respectively, and can be flexibly selected according to specific thermal management requirements.

[0036] As a preferred embodiment, the outer wall of the cooling pipe 3 is provided with a number of heat dissipation fins, which can increase the effective heat exchange area between the cooling pipe 3 and the cooling medium, so that heat can be transferred from the pipe wall of the cooling pipe 3 to the cooling medium more quickly, thereby improving the heat dissipation efficiency of the cooling pipe 3. In addition, the arrangement of heat dissipation fins can disrupt the laminar boundary layer on the outside of the cooling pipe 3, enhance the fluid disturbance and turbulence, and further improve the surface convective heat transfer coefficient.

[0037] In a preferred embodiment, the vent pipe 2 is provided with mounting holes, and both ends of the cooling pipe 3 are fitted with the mounting holes. A sealing ring is provided between the cooling pipe 3 and the mounting holes. The elastic deformation of the sealing ring can compensate for the slight gap changes caused by thermal expansion and contraction or assembly tolerances, effectively sealing the gap at the interface between the cooling pipe 3 and the mounting holes, preventing the high-temperature compressed air inside the vent pipe 2 from leaking out through the mounting holes, and also preventing the cooling medium from seeping back into the vent pipe 2, thereby ensuring the airtightness of the air circuit.

[0038] As a preferred embodiment, as shown in the appendix Figures 1 to 3 As shown, a connecting flange 22 is fixedly provided at the end of the vent pipe 2 facing the hollow shaft 1. The connecting flange 22 is fixed to the air inlet end by fastening bolts, making the vent pipe 2 and the hollow shaft 1 detachably rigidly connected, which facilitates on-site installation, maintenance or replacement of parts. In addition, the connecting flange 22 can provide a large contact surface, which helps to disperse the preload of the fastening bolts, reduce the contact stress at the connection, and improve the sealing performance and vibration resistance of the connection between the vent pipe 2 and the hollow shaft 1.

[0039] In a preferred embodiment, a sealing gasket is provided between the connecting flange 22 and the air inlet end face of the hollow shaft 1. This gasket effectively fills the microscopic uneven gap at the contact interface between the vent pipe 2 and the hollow shaft 1. Under the pre-tightening pressure provided by the fastening bolts, it undergoes elastic deformation, thereby forming a reliable airtight seal to prevent high-temperature compressed air from leaking outward from between the connecting flange 22 and the air inlet end face. At the same time, the sealing gasket can absorb the thermal expansion difference caused by temperature changes and the relative displacement caused by mechanical vibration, reducing wear or scratches on the connecting surface and playing a certain buffering role, which is conducive to maintaining the stability of the sealing performance during long-term operation.

[0040] As a preferred embodiment, as shown in the appendix Figure 1 As shown, the permanent magnet direct drive motor also includes a housing 4 and a cooling cover 5 fixed to the end of the housing 4. The cooling cover 5 has a cooling chamber 51, and the vent pipe 2 is located inside the cooling chamber 51, providing a closed heat exchange space for the cooling medium. An air supply pipe 52 is fixed outside the cooling cover 5, and a cooling fan is fixed to the air supply pipe 52. The cooling fan drives the cooling medium to circulate in the cooling chamber 51, thereby continuously removing the heat dissipated by the vent pipe 2. Integrating the cooling chamber 51 with the housing 4 shortens the heat transport path between the cooling medium and the vent pipe 2. At the same time, using the forced convection of the cooling fan to replace natural heat dissipation helps to stabilize the flow rate and temperature distribution of the cooling medium around the vent pipe 2, ensuring the uniformity of the cooling effect during long-term operation.

[0041] In a preferred embodiment, the permanent magnet direct drive motor also includes a temperature sensor located in the central through-hole of the hollow shaft 1. The temperature sensor is used to detect the current temperature of the central through-hole. Both the temperature sensor and the cooling fan are connected to the controller, forming a closed-loop temperature control system. The controller adjusts the speed of the cooling fan based on the signal sent by the temperature sensor when the current temperature of the central through-hole exceeds the set temperature. This increases or decreases the circulation flow rate of the cooling medium as needed, dynamically matching the heat dissipation capacity according to the actual heat load. This avoids energy consumption caused by long-term high-speed operation of the cooling fan and prevents overheating of the central through-hole due to insufficient cooling, thus helping to improve the energy efficiency of the motor under varying operating conditions.

[0042] It should be noted that the controller should include a signal receiving unit, a signal judging unit, and a signal transmitting unit. The signal receiving unit receives electrical signals sent by detection components such as temperature sensors. The signal judging unit is electrically connected to the signal receiving unit so that it can determine whether the signal received by the signal receiving unit is a trigger signal. The signal transmitting unit is electrically connected to the signal judging unit so that it can send the judgment signal generated by the signal judging unit to the actuators such as cooling fans. The specific configuration of the signal receiving unit, signal judging unit, and signal transmitting unit can refer to existing technologies; in this utility model, only the application scenario of the above three components has been changed, and no substantial improvement has been made. Obviously, controllers with this structure are widely used in existing automatic control equipment, such as MCUs, DSPs, or microcontrollers. The key point of this utility model is that the controller combines the temperature sensor and the cooling fan.

[0043] This utility model also provides a flotation device, including the aforementioned permanent magnet direct drive motor, which has the same beneficial effects.

[0044] It should be noted that relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0045] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of this utility model.

Claims

1. A permanent magnet direct drive motor, characterized in that, It includes a hollow shaft (1) and a vent pipe (2). The vent pipe (2) is fixed to the air inlet end of the hollow shaft (1). The central through hole of the hollow shaft (1) is coaxially connected with the air inlet through hole (21) of the vent pipe (2). The air inlet through hole (21) is used to guide high-temperature air into the central through hole. The ventilation pipe (2) is fixed with several cooling pipes (3). The cooling through holes (31) of the cooling pipes (3) intersect with the air inlet through hole (21). The cooling medium in the cooling through hole (31) exchanges heat with the high temperature compressed air in the air inlet through hole (21).

2. The permanent magnet direct drive motor of claim 1, wherein, The centerlines of the cooling pipe (3) and the vent pipe (2) are perpendicular to each other.

3. The permanent magnet direct drive motor of claim 1, wherein, The cross-section of the cooling pipe (3) is circular or square.

4. The permanent magnet direct drive motor of claim 1, wherein, The outer wall of the cooling pipe (3) is fixed with several heat dissipation fins.

5. The permanent magnet direct drive motor of claim 1, wherein, The vent pipe (2) is provided with mounting holes, and the two ends of the cooling pipe (3) are matched with the mounting holes. A sealing ring is provided between the cooling pipe (3) and the mounting holes.

6. The permanent magnet direct drive motor of claim 1, wherein, The vent pipe (2) has a connecting flange (22) fixed at one end facing the hollow shaft (1), and the connecting flange (22) is fixed to the air inlet end by fastening bolts.

7. The permanent magnet direct drive motor of claim 6, wherein, A sealing gasket is provided between the connecting flange (22) and the air intake end face of the hollow shaft (1).

8. The permanent magnet direct drive motor of claim 1, wherein, It also includes an outer shell (4) and a cooling cover (5) fixed to the end of the outer shell (4). The cooling cover (5) has a cooling cavity (51), and the vent pipe (2) is located inside the cooling cavity (51). An air supply pipe (52) is fixed outside the cooling cover (5), and a cooling fan (6) is fixed on the air supply pipe (52). The cooling fan (6) is used to drive the cooling medium to circulate in the cooling cavity (51).

9. The permanent magnet direct drive motor of claim 8, wherein, It also includes a temperature sensor located in the central through hole of the hollow shaft (1), the temperature sensor being used to detect the current temperature of the central through hole; the temperature sensor and the cooling fan (6) are both connected to a controller, the controller being used to adjust the speed of the cooling fan (6) when the current temperature of the central through hole exceeds a set temperature according to the signal sent by the temperature sensor.

10. A flotation device, characterized in that Includes the permanent magnet direct drive motor as described in any one of claims 1 to 9.

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