Waterproof device and waterproof method of horizontal liquid internal circulation motor

Abstract

The invention discloses a waterproof device and waterproof method for a horizontal liquid internal circulation motor, and belongs to the technical field of motor waterproofness, the waterproof device comprises a motor, the motor comprises a shell, a front cover and a rear cover, the front cover and the rear cover are mounted at the front end and the rear end of the shell respectively, a stator wound with a stator winding is mounted in the shell, and a rotating shaft is mounted between the front cover and the rear cover through a bearing; a rotor is fixedly arranged on the outer wall, located in the shell, of the rotating shaft, a permanent magnet is arranged on the rotor, a layer of plastic shielding sleeve covers an inner hole of the stator and the outer circle surface of the rotor in an injection molding mode, isolation rings used for sealing are arranged in the front cover and the rear cover, and the shell, the front cover and the rear cover jointly form a water injection cavity. The working efficiency of the motor of the shield pump can be improved, the energy consumption can be reduced, the influence of eddy current in the motor can be reduced, the temperature rise of the motor can be effectively controlled, the structure of the motor can be simplified to a certain extent, and the manufacturing and maintenance cost can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of motor waterproofing, and particularly to a waterproof device and method for a horizontal liquid internal circulation motor. Background Art

[0002] Existing canned motor pumps are widely used in fields such as chemical industry and pharmaceuticals. Due to their compact structure and good sealing performance, they can operate stably in harsh environments. However, traditional canned motor pumps have some obvious deficiencies, which limit their application and development in certain specific situations. For example, a canned motor pump operating in a high-temperature environment is prone to performance degradation or even damage due to overheating, which not only increases the maintenance cost but also affects the production efficiency. Therefore, how to improve the working efficiency of canned motor pumps and reduce heat generation has become one of the key research points currently.

[0003] Currently, common canned motor pumps mainly include a rotor core and a rotor winding, as well as a shield casing made of stainless steel material. Although this design can achieve a good sealing effect, it also brings some problems. First, the use of a rotor winding will significantly reduce the efficiency of the canned motor pump and increase energy consumption; second, the stainless steel shield casing will generate a large amount of eddy currents during the operation of the motor, further exacerbating the heat generation phenomenon of the motor. To address these problems, some improvement measures have been proposed in the industry, such as optimizing the design parameters of the motor and adopting a new cooling system, but these solutions are often complex and costly, making it difficult to promote on a large scale.

[0004] Although the existing design schemes of canned motor pumps can meet the basic usage requirements, there are still obvious deficiencies in energy efficiency improvement and heat dissipation control. On the one hand, the presence of the rotor winding makes the overall efficiency of the motor relatively low and the energy waste serious; on the other hand, the eddy current effect caused by the stainless steel shield casing leads to an increase in the motor temperature, and long-term operation may accelerate the aging of the motor and shorten its service life. In addition, traditional designs also require additional cooling devices to assist in heat dissipation, increasing the complexity of the system and the difficulty of operation and maintenance. In view of this, we propose a waterproof device and method for a horizontal liquid internal circulation motor that can effectively improve the above problems. Summary of the Invention

[0005] Therefore, the present invention provides a waterproof device and method for a horizontal liquid internal circulation motor to solve the above problems.

[0006] The present invention provides the following technical solution: A waterproof device for a horizontal liquid internal circulation motor, including a motor. The motor includes a housing, a front cover and a rear cover respectively installed at the front and rear ends of the housing. The front cover, the rear cover and the housing are assembled into a complete sealed space for installing components such as a rotor and a stator. A stator wound with a stator winding is installed in the housing. After the stator winding is energized, a magnetic flux is generated in the stator core. The rotor is cut by the magnetic lines of force in the rotating magnetic field, thereby generating an induced electromotive force and an electromagnetic torque to achieve rotation. A rotating shaft is installed between the front cover and the rear cover through a bearing. One end of the rotating shaft extends to the outside of the front cover as a driving end. A rotor is fixedly arranged on the outer wall of the rotating shaft inside the housing. Permanent magnets are arranged on the rotor. The use of permanent magnets does not require external excitation. After using permanent magnets, the rotor winding does not need to be installed anymore, making the structure of the shielded motor simple and efficient. The above structure is the basic structure of the motor. During use, alternating current is connected. The stator is the stationary part of the motor and can generate a rotating magnetic field. When the stator winding is energized, a magnetic flux will be generated in the stator core. These magnetic fluxes form a rotating magnetic field in space. The rotor can be cut by the magnetic lines of force in the rotating magnetic field, thereby generating an induced electromotive force and an electromagnetic torque. The rotating magnetic field generated by the stator interacts with the rotor winding or the permanent magnet in the rotor to generate an electromagnetic torque to drive the rotor to rotate. A plastic shielding sleeve is covered on the inner hole of the stator and the outer circular surface of the rotor by injection molding. The plastic shielding sleeve is made of an engineering plastic material with high temperature resistance and good insulation performance. Specifically, polyamide (PA6) material can be used, which has excellent high temperature resistance and insulation performance. The plastic shielding layer is tightly wrapped on the inner hole of the motor stator and the outer circular surface of the rotor by injection molding to ensure gapless contact and uniform thickness, so as to ensure good protection effect. During use, the electrical part inside the motor is effectively isolated to prevent moisture from invading, and at the same time, the generation of eddy currents is reduced, and the temperature rise of the motor is lowered. Isolation rings for sealing are arranged in both the front cover and the rear cover. A water injection cavity is jointly formed inside the housing, the front cover and the rear cover. The isolation ring is used to block the through grooves where the rotating shaft passes through the front cover and the rear cover, which can effectively prevent water leakage. The water injection cavity is provided with a water inlet and a water outlet. When the motor starts, the rotor rotates under the action of the external magnetic field, driving the liquid to circulate inside and outside the motor. The liquid enters the motor through the water inlet, passes through the gap between the plastic shielding layer and the rotor, absorbs the heat generated by the motor, and then discharges from the water outlet.

[0007] As a preferred solution of the present invention, the connection part between the front cover, the rear cover and the housing has an O-ring, so that the connection part between the front cover, the rear cover and the housing has a high sealing effect, ensuring the sealing of the internal cavity, preventing the introduced cooling water from leaking, and enabling the cooling water to flow fully in the cavity for heat dissipation.

[0008] As a preferred embodiment of the present invention, a heat insulation protective cover is provided on the outer shell. The heat insulation protective cover is made of a glass fiber reinforced composite material, which has a low thermal conductivity and good mechanical properties, further reducing the influence of the external environment on the motor temperature rise. Adding the heat insulation protective cover can more effectively isolate the external heat conduction, enabling the motor to still operate normally in a higher temperature environment and extending the service life of the motor.

[0009] As a preferred embodiment of the present invention, the bearing is a graphite bearing. The graphite bearing is a self-lubricating bearing. Graphite is a non-metallic mineral with a layered structure. Its molecular structure consists of multiple parallel layers, each layer composed of carbon atoms, and the layers are attracted together by weak van der Waals forces. This structure makes it easy for the layers to slide relative to each other when graphite is subjected to external forces, thus showing good lubrication performance. When the shaft and the bearing undergo sliding friction, a part of the graphite particles will transfer to the friction surface of the shaft and the bearing, forming a relatively stable solid lubrication diaphragm. This lubrication diaphragm can prevent the direct adhesive wear between the shaft and the bearing, thereby achieving the effect of self-lubrication, preventing the direct adhesive wear between the shaft and the bearing, having excellent wear resistance and compressive properties. Adding the self-lubricating bearing can significantly reduce the friction resistance of the motor, reduce energy loss, improve the overall operating efficiency, and at the same time extend the maintenance cycle of the motor.

[0010] As a preferred embodiment of the present invention, the rotor consists of a rotor core and a rotor winding. The material of the rotor core is any one of aluminum alloy, magnesium alloy, and titanium alloy. The rotor winding is made of copper wire. Aluminum alloy has a low density and good mechanical properties, and also has a certain electrical conductivity. Magnesium alloy has excellent specific strength and specific stiffness. Titanium alloy has high strength, low density, and good corrosion resistance, but its cost is high and the processing difficulty is large. In actual application, the material of the rotor core can be selected and replaced according to actual needs to reduce the overall weight and improve the strength.

[0011] As a preferred embodiment of the present invention, the plastic shielding sleeve is made of polyamide. The plastic shielding sleeve can be selected with different thicknesses according to specific requirements to adapt to different working environments and load conditions. The plastic shielding layer is tightly wrapped around the inner hole of the motor stator and the outer surface of the rotor by injection molding to ensure gapless contact and uniform thickness, so as to ensure good protection effect.

[0012] As a preferred embodiment of the present invention, both the water inlet hole and the water outlet hole are made of stainless steel pipes. The stainless steel pipes have good corrosion resistance and durability, effectively improving the service life of the motor. In actual use, the liquid enters the motor through the water inlet, passes through the gap between the plastic shielding layer and the rotor, absorbs the heat generated by the motor, and then discharges from the water outlet.

[0013] A waterproofing method for a horizontal liquid internal circulation motor, comprising the following steps: S1: Assemble and connect the stator winding to the stator, then install the stator assembly in the housing, and externally connect alternating current at the top as the driving source; S2: Assemble the rotor core and the rotor winding together to form a complete rotor, insert the rotor into the inner hole of the motor stator, ensure that the two are coaxial, so that after the stator winding is energized, magnetic flux will be generated in the stator core, and these magnetic fluxes will form a rotating magnetic field in space. The rotor can then be cut by the magnetic lines of force in the rotating magnetic field to generate electromagnetic torque and drive the rotor to rotate; S3: Injection mold the plastic shielding layer so that it tightly wraps the inner hole of the motor stator and the outer surface of the rotor. Check whether there are bubbles or cracks in the plastic shielding layer. If so, re-inject to effectively isolate the electrical part inside the motor, prevent moisture from invading, and at the same time reduce the generation of eddy currents; S4: Install the rotating shaft into the rotor, and then assemble the front cover and the rear cover onto the housing; S5: Install the water inlet and the water outlet, ensure that the interfaces are well sealed. When in use, the liquid enters the motor through the water inlet, passes through the gap between the plastic shielding layer and the rotor, absorbs the heat generated by the motor, and then discharges from the water outlet to play a cooling role; S6: Connect the power supply, start the motor, and observe the running condition of the motor to ensure there is no abnormal noise or vibration; S7: Regularly check whether the water inlet and the water outlet are unblocked to keep the water flow smooth.

[0014] The beneficial effects of the present invention are as follows: Through the liquid internal circulation cooling system, the present invention can effectively enhance the heat dissipation performance of the motor, ensure the stable operation of the motor in a high-temperature environment, significantly improve the working efficiency of the canned motor, reduce energy consumption, save operating costs, greatly reduce the influence of eddy currents inside the motor, effectively control the temperature rise of the motor, extend the service life of the motor, simplify the motor structure, reduce the manufacturing and maintenance costs, and enhance the market competitiveness of the product. Description of the Drawings

[0015] The present invention will be further described below with reference to the drawings.

[0016] Figure 1 is a structural cross-sectional view of the present invention; Figure 2 is Figure 1 a partial enlarged view of part A in

[0017] Legend Explanation: 1. Outer shell; 2. Front cover; 3. Rear cover; 4. Stator; 5. Rotor; 6. Permanent magnet; 7. Rotating shaft; 8. Plastic shielding sleeve; 9. O-ring; 10. Heat insulation protection cover; 11. Graphite bearing; 12. Isolation ring; 13. Water inlet; 14. Water outlet. Detailed implementation manners

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without any creative efforts shall fall within the protection scope of the present invention.

[0019] The following gives specific embodiments.

[0020] As Figures 1-2 shown, a waterproof device for a horizontal liquid internal circulation motor includes a motor, the motor includes an outer shell 1 and a front cover 2 and a rear cover 3 respectively installed at the front and rear ends of the outer shell 1. The front cover 2, the rear cover 3 and the outer shell 1 are assembled into a complete sealed space for installing components such as a rotor 5 and a stator 4 inside. A stator 4 with a stator winding wound thereon is installed in the outer shell 1. After the stator winding is energized, a magnetic flux is generated in the stator iron core. The rotor 5 is cut by the magnetic lines of force in the rotating magnetic field, thereby generating an induced electromotive force and an electromagnetic torque to achieve rotation. A rotating shaft 7 is installed between the front cover 2 and the rear cover 3 through a bearing. One end of the rotating shaft 7 extends to the outside of the front cover 2 as a driving end, and can be connected to the component to be driven during actual use. The other end of a conventional motor is mostly used to connect a fan blade, while the present application dissipates heat in a water-cooling manner, not only does not need to install a fan blade, but also can greatly improve the heat dissipation effect. A rotor 5 is fixedly arranged on the outer wall of the rotating shaft 7 inside the outer shell 1. A permanent magnet is arranged on the rotor 5. The use of a permanent magnet does not require external excitation. After using the permanent magnet 6, the rotor winding does not need to be installed anymore, making the structure of the shielding motor simple and efficient. The above structure is the basic structure of the motor. During use, alternating current is connected. The stator 4 is the stationary part in the motor and can generate a rotating magnetic field. When the stator winding is energized, a magnetic flux will be generated in the stator iron core. These magnetic fluxes form a rotating magnetic field in space. The rotor 5 can be cut by the magnetic lines of force in the rotating magnetic field, thereby generating an induced electromotive force and an electromagnetic torque. The rotating magnetic field generated by the stator 4 interacts with the rotor winding or the permanent magnet 6 in the rotor 5 to generate an electromagnetic torque to drive the rotor 5 to rotate.

[0021] A plastic shielding sleeve 8 is covered on the inner hole of the stator 4 and the outer circumferential surface of the rotor 5 by means of injection molding. The plastic shielding sleeve 8 is made of an engineering plastic material with high temperature resistance and good insulation properties. Specifically, polyamide PA6 material can be used, which has excellent high temperature resistance and insulation performance. The plastic shielding layer is tightly wrapped around the inner hole of the motor stator 4 and the outer circumferential surface of the rotor 5 by injection molding to ensure gapless contact and uniform thickness, so as to ensure good protection effect. During use, the electrical part inside the motor is effectively isolated, preventing moisture from invading, while reducing the generation of eddy currents and lowering the temperature rise of the motor. Isolation rings 12 for sealing are provided inside both the front cover 2 and the rear cover 3. A water injection cavity is jointly formed inside the housing 1, the front cover 2 and the rear cover 3. The isolation ring 12 is used to block the through slots where the rotating shaft 7 passes through the front cover 2 and the rear cover 3, which can effectively prevent water leakage. An inlet 13 and an outlet 14 are provided on the water injection cavity. During actual use, when the motor starts, the rotor 5 rotates under the action of an external magnetic field, driving the liquid to circulate inside and outside the motor. The liquid enters the motor through the inlet 13, passes through the gap between the plastic shielding layer and the rotor 5, absorbs the heat generated by the motor, and then discharges from the outlet 14. The plastic shielding layer effectively isolates the electrical part inside the motor, prevents moisture from invading, while reducing the generation of eddy currents and lowering the temperature rise of the motor. During the whole process, each component of the motor works together to achieve efficient energy conversion and stable operation state.

[0022] The connection part of the front cover 2, the rear cover 3 and the housing 1 is provided with an O-ring 9, so that the connection part of the front cover 2, the rear cover 3 and the housing 1 has a high sealing effect, ensuring the sealing of the internal cavity, preventing the injected cooling water from leaking, and enabling the cooling water to flow fully inside the cavity for heat dissipation.

[0023] A heat insulation protection cover 10 is provided on the housing 1. The heat insulation protection cover 10 is made of a glass fiber reinforced composite material, which has a low thermal conductivity and good mechanical properties, further reducing the influence of the external environment on the temperature rise of the motor. Adding the heat insulation protection cover 10 can more effectively isolate the external heat conduction, enabling the motor to still operate normally in a higher temperature environment and extending the service life of the motor.

[0024] The bearing is a graphite bearing 11. The graphite bearing 11 is a self-lubricating bearing. Graphite is a non-metallic mineral with a layered structure. Its molecular structure consists of multiple layers arranged in parallel. Each layer is composed of carbon atoms, and the layers are attracted together by weak van der Waals forces. This structure enables graphite to easily undergo relative sliding between layers when subjected to external forces, thus exhibiting good lubrication performance. When the shaft and the bearing undergo sliding friction, a part of the graphite particles will transfer to the friction surfaces of the shaft and the bearing, forming a relatively stable solid lubrication diaphragm. This lubrication diaphragm can prevent the direct adhesive wear between the shaft and the bearing, thereby achieving the effect of self-lubrication, preventing the direct adhesive wear between the shaft and the bearing, having excellent wear resistance and compressive properties. Adding a self-lubricating bearing can significantly reduce the friction resistance of the motor, reduce energy loss, improve the overall operating efficiency, and at the same time extend the maintenance cycle of the motor.

[0025] The rotor 5 is composed of a rotor core and a rotor winding. The material of the rotor core is any one of aluminum alloy, magnesium alloy, and titanium alloy. The rotor winding is a copper wire. Aluminum alloy has a low density and good mechanical properties, and at the same time has a certain electrical conductivity. Magnesium alloy has excellent specific strength and specific stiffness. Titanium alloy has high strength, low density, and good corrosion resistance, but its cost is high and the processing difficulty is large. In actual application, the material of the rotor core can be selected and replaced according to actual needs to reduce the overall weight and improve the strength.

[0026] The plastic shielding sleeve 8 is made of polyamide. The plastic shielding sleeve 8 can be selected with different thicknesses according to specific requirements to adapt to different working environments and load conditions. The plastic shielding layer tightly wraps around the inner hole of the motor stator 4 and the outer surface of the rotor 5 by injection molding to ensure gapless contact and uniform thickness, so as to ensure good protection effect. During use, the plastic shielding layer effectively isolates the electrical part inside the motor, prevents moisture intrusion, and at the same time reduces the generation of eddy currents and lowers the temperature rise of the motor.

[0027] The water inlet hole and the water outlet 14 are both stainless steel pipes. The stainless steel pipes have good corrosion resistance and durability, effectively improving the service life of the motor. In actual use, the liquid enters the motor through the water inlet 13, passes through the gap between the plastic shielding layer and the rotor 5, absorbs the heat generated by the motor, and then discharges from the water outlet 14.

[0028] A waterproof method for a horizontal liquid internal circulation motor includes the following steps: S1: Assemble and connect the stator winding with the stator 4, and then install the stator assembly in the housing 1, and externally connect alternating current at the top as the driving source; S2: Assemble the rotor core and the rotor winding together to form a complete rotor 5, and insert the rotor 5 into the inner hole of the motor stator 4, ensuring that the two are coaxial. After the stator winding is energized, magnetic flux will be generated in the stator core. These magnetic fluxes form a rotating magnetic field in space. The rotor 5 can then be cut by the magnetic lines of force in the rotating magnetic field, generating an electromagnetic torque to drive the rotation of the rotor 5; S3: Injection mold the plastic shielding layer so that it tightly wraps the inner hole of the motor stator 4 and the outer circumferential surface of the rotor 5. Check whether there are bubbles or cracks in the plastic shielding layer. If so, re-injection molding is required to effectively isolate the electrical part inside the motor by the plastic shielding layer, prevent moisture from invading, and at the same time reduce the generation of eddy currents; S4: Install the rotating shaft 7 into the rotor 5, and then assemble the front cover 2 and the rear cover 3 onto the housing 1; S5: Install the water inlet 13 and the water outlet 14, ensuring that the interfaces are well sealed. When in use, the liquid enters the motor through the water inlet 13, passes through the gap between the plastic shielding layer and the rotor 5, absorbs the heat generated by the motor, and then discharges from the water outlet 14 to play a cooling role; S6: Connect the power supply, start the motor, and observe the operation of the motor to ensure that there are no abnormal noises and vibrations; S7: Regularly check whether the water inlet 13 and the water outlet 14 are unobstructed to keep the water flow smooth.

[0029] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A waterproof device for a horizontal liquid internal circulation motor, comprising a motor, the motor includes a housing (1) and a front cover (2) and a rear cover (3) respectively installed at the front and rear ends of the housing (1), a stator (4) wound with a stator winding is installed in the housing (1), a rotating shaft (7) is installed between the front cover (2) and the rear cover (3) through bearings, a rotor (5) is fixedly arranged on the outer wall of the rotating shaft (7) inside the housing (1), and a permanent magnet is arranged on the rotor (5), characterized in that: A plastic shielding sleeve (8) is covered on the inner hole of the stator (4) and the outer circumferential surface of the rotor (5) by injection molding. An isolation ring (12) for sealing is arranged in each of the front cover (2) and the rear cover (3), so that a water injection cavity is jointly formed inside the housing (1), the front cover (2) and the rear cover (3). An inlet (13) and an outlet (14) are arranged on the water injection cavity.

2. The waterproof device of the horizontal liquid internal circulation motor according to claim 1, wherein: An O-ring (9) is provided at the connection part of the front cover (2), the rear cover (3) and the housing (1).

3. The waterproof device of the horizontal liquid internal circulation motor according to claim 1, characterized in that: A heat insulation protection cover (10) is arranged on the housing (1), and the heat insulation protection cover (10) is made of a glass fiber reinforced composite material.

4. The waterproof device of the horizontal liquid internal circulation motor according to claim 1, wherein: The bearing is a graphite bearing (11).

5. The waterproof device of the horizontal liquid internal circulation motor according to claim 1, characterized in that: The rotor (5) is composed of a rotor (5) iron core and a rotor winding. The material of the rotor iron core is any one of aluminum alloy, magnesium alloy and titanium alloy, and the rotor winding is a copper wire.

6. The waterproof device of the horizontal liquid internal circulation motor according to claim 1, characterized in that: The plastic shielding sleeve (8) is made of polyamide.

7. The waterproof device of the horizontal liquid internal circulation motor according to claim 1, characterized in that: Both the water inlet hole and the outlet (14) are stainless steel pipes.

8. A waterproofing method for a horizontal liquid internal circulation motor, which is realized based on the waterproofing device of the horizontal liquid internal circulation motor according to any one of claims 1-7, characterized in that, It includes the following steps: S1: Assemble and connect the stator winding with the stator (4), and then install the stator assembly into the housing (1); S2: Assemble the rotor (5) iron core and the rotor winding together, and at the same time install the permanent magnet (6) to form a complete rotor (5). Insert the rotor (5) into the inner hole of the motor stator (4) to ensure that the two are coaxial; S3: Injection mold the plastic shielding layer so that it tightly wraps the inner hole of the motor stator (4) and the outer circumferential surface of the rotor (5). Check whether there are bubbles or cracks in the plastic shielding layer. If so, re-injection molding is required; S4: Install the rotating shaft (7) into the rotor (5), and then assemble the front cover (2) and the rear cover (3) onto the housing (1); S5: Install the inlet (13) and the outlet (14) to ensure that the interfaces are well sealed; S6: Connect the power supply, start the motor, observe the operation of the motor, and ensure that there is no abnormal sound or vibration; S7: Regularly check whether the inlet (13) and the outlet (14) are unblocked to keep the water flow smooth.

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