Rotor assembly and dry-grinding-resistant magnetic drive pump

Abstract

The invention relates to the technical field of magnetic drive pumps, in particular to a rotor assembly and a dry-grinding-resistant magnetic drive pump, the rotor assembly comprises a pump shaft, a bearing inner ring and a bearing outer ring, one end of the pump shaft is connected with an inner magnetic rotor, the bearing inner ring sleeves the middle of the pump shaft, the bearing outer ring sleeves the bearing inner ring, and the bearing outer ring is integrally assembled on the inner side of a pump cover. An independent supporting mode is adopted, the bearing is integrally assembled on the bearing seat, and the position of the shaft sleeve is adjusted to the center of the pump shaft, so that the stability of the magnetic drive pump under the working conditions of cutoff, idling and the like can be improved, the temperature rise of the bearing is reduced, the loss of excitation of inner magnetic steel is avoided, the overall stability of the pump body can be enhanced, and the service life of the pump body can be prolonged. The lubricating and cooling effects are optimized, the reliability and the safety of the pump are effectively improved, meanwhile, the flow guide groove formed in the bearing outer ring in advance can guide entering air into the position between the bearing outer ring and the bearing inner ring, and a relative distance is kept between the bearing inner ring and the bearing outer ring.

Description

Technical Field

[0001] The invention relates to the technical field of magnetic pumps, in particular to a rotor assembly and a dry wear-resistant magnetic pump. Background Art

[0002] A magnetic pump is a device that uses magnetic force to drive the rotor inside the pump body to transport fluids. It transmits power through magnetic force, avoiding the problem of using mechanical seals in traditional pumps, so that it can operate in some special working environments and has high reliability and sealing performance. The core components of the magnetic pump are composed of an external driving magnet, an inner rotor in the pump body, and a spacer sleeve. The external magnet attracts the inner rotor through magnetic force, thereby driving the inner rotor to rotate and transporting the fluid. Magnetic pumps are widely used in transporting toxic, volatile, and highly corrosive liquids, or in situations where leakage-free operation is required.

[0003] The Chinese invention patent with the publication number of "CN105298863B" discloses a dry wear resistant magnetic pump, wherein the outer magnetic rotor is mounted on the end of the motor shaft, and an isolation sleeve is arranged between the impeller with the inner magnetic rotor and the outer magnetic rotor, wherein the isolation sleeve is sealed and fixedly connected with the pump body to form a pump chamber, and the motor is fixed to the pump body through a coupling frame, and the pump shaft assembly includes a sleeve, a first pump shaft and a second pump shaft, wherein the impeller is fixedly mounted on the sleeve, and one end of the first pump shaft is placed in one port of the sleeve, and the other end of the first pump shaft is placed on the first support portion of the pump body, and one end of the second pump shaft is placed in another port of the sleeve, and the other end of the second pump shaft is placed on the second support portion of the isolation sleeve. In the design of these existing magnetic pumps, the support structure of the inner rotor is usually supported by a sliding bearing. Specifically, the inner rotor forms a first support point through the bearing (outer ring) in the pump body mouth ring and the sleeve (inner ring) at the front end of the impeller, while the sleeve (inner ring) at the rear end of the pump shaft and the bearing (outer ring) in the isolation sleeve form a second support point. The design of this structure effectively distributes the gravity of the inner rotor to a certain extent and improves the service life of the bearing. However, this structure also has certain shortcomings, especially when there may be abnormal situations such as sudden material interruption, flow interruption, idling, etc. during operation. The traditional support structure supports the inner rotor through the cooperation of multiple bearings and sleeves. If the pump idles, the lubricating fluid supply between the bearing and the sleeve may be interrupted, resulting in friction and temperature increase, which will cause bearing damage. The temperature of the bearing part will rise sharply, which will affect the magnetism of the inner magnetic steel of the pump, and even make the inner magnetic steel lose its magnetism in a short time, causing the magnetic pump to fail to work normally. Summary of the invention

[0004] The purpose of the present invention is to solve the problem in the prior art that the supply of lubricating fluid between the bearing and the sleeve may be interrupted, resulting in friction and temperature increase. A rotor assembly is provided, which can improve the stability of the magnetic pump under working conditions such as flow interruption and idling, reduce the temperature rise of the bearing, avoid demagnetization of the internal magnetic steel, and enhance the overall stability and service life of the pump body.

[0005] In order to solve the above problems, the present invention provides a rotor assembly including a pump shaft, a bearing inner ring and a bearing outer ring, one end of the pump shaft is connected to the inner magnetic rotor, the bearing inner ring is sleeved in the middle of the pump shaft, the bearing outer ring is sleeved on the bearing inner ring, and the bearing outer ring is assembled as a whole on the inner side of the pump cover.

[0006] As a further description of the above technical solution: a plurality of guide grooves are provided inside the outer ring of the bearing, and a mounting groove is provided outside the outer ring of the bearing.

[0007] As a further description of the above technical solution: a flow hole is opened on the pump cover, and a limit pin matched with the installation groove is arranged on the inner side of the pump cover.

[0008] As a further description of the above technical solution: a plurality of guide grooves are arranged at equal intervals, and the guide grooves are arc-shaped grooves.

[0009] As a further description of the above technical solution: the diameter of the guide groove opening gradually decreases toward the end of the pump shaft.

[0010] As a further description of the above technical solution: four guide grooves are provided.

[0011] As a further description of the above technical solution: the flow hole is located at the end of the guide groove with a larger opening diameter.

[0012] As a further description of the above technical solution: the bearing outer ring includes a first outer ring and a second outer ring, and the flow hole is located between the first outer ring and the second outer ring.

[0013] A dry wear resistant magnetic pump has a rotor assembly and also includes an external magnetic rotor. The external magnetic rotor is connected to an electric motor, and the electric motor is connected to a pump body. The interior of the pump body is connected to a pump cover via a sealing gasket, and an impeller connected to a pump shaft is arranged inside the pump body.

[0014] As a further description of the above technical solution: a cooling groove is arranged outside the pump body, and a water inlet is arranged on the cooling groove.

[0015] The above technical solution has the following advantages or beneficial effects:

[0016] 1. The present invention adopts an independent support method, assembles the bearing as a whole to the bearing seat, and adjusts the position of the sleeve to the center of the pump shaft. It can not only improve the stability of the magnetic pump under working conditions such as flow interruption and idling, reduce the temperature rise of the bearing, and avoid demagnetization of the internal magnetic steel, but also enhance the overall stability and service life of the pump body, optimize the lubrication and cooling effects, and effectively improve the reliability and safety of the pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the structure of a rotor assembly in one embodiment of the present invention;

[0018] Figure 2 It is a schematic structural diagram of a rotor assembly and a dry wear-resistant magnetic pump in one embodiment of the present invention;

[0019] Figure 3 for Figure 1 Schematic diagram of the structure of the middle diversion trough;

[0020] Figure 4 for Figure 1 Cross-section of the outer ring of the middle bearing Figure 1 ;

[0021] Figure 5 for Figure 1 Cross-section of the outer ring of the middle bearing Figure 2 ;

[0022] Figure 6 for Figure 1 Schematic diagram of the structure of the outer ring of the middle bearing.

[0023] Legend:

[0024] 1. Pump shaft; 2. Inner magnetic rotor; 3. Bearing inner ring; 4. Bearing outer ring; 5. Pump cover; 6. Guide groove; 7. Mounting groove; 8. Flow hole; 9. Limit pin; 10. Outer magnetic rotor; 11. Motor; 12. Pump body; 13. Sealing gasket; 14. Impeller; 15. Cooling groove; 16. Water inlet; 41. First outer ring; 42. Second outer ring. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] In the description of the present invention, it should be noted that the terms "vertical", "up", "down", "horizontal", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0027] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "disposed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] See also Figure 1-6 The present invention provides a technical solution: a rotor assembly includes a pump shaft 1, a bearing inner ring 3 and a bearing outer ring 4, one end of the pump shaft 1 is connected to the inner magnetic rotor 2, the bearing inner ring 3 is sleeved in the middle of the pump shaft 1, the bearing outer ring 4 is sleeved on the bearing inner ring 3, and the bearing outer ring 4 is assembled as a whole on the inner side of the pump cover 5.

[0029] In the technical solution provided by the present invention, the pump cover 5 is equivalent to the bearing seat, and the inner ring 3 of the bearing is equivalent to the sleeve. By adding a pump cover 5, the pump cover 5 is equivalent to the bearing seat. By independently designing the bearing seat and assembling the bearing as a whole, it can better contact with the lubricating fluid. Due to the independence of the bearing seat, it can effectively increase the flow area and flow speed of the lubricating fluid, thereby enhancing the lubrication and cooling effects, and reducing the temperature rise caused by insufficient lubrication. This helps to keep the temperature of the bearing part stable when the pump is interrupted or idling, and avoid failures caused by overheating. By adjusting the position of the bearing support, the temperature and working environment of the bearing are more stable, especially the improvement of the lubrication and cooling effects, which can avoid the temperature increase caused by overheating of the bearing, thereby reducing the risk of the internal magnetic steel losing its magnetism due to excessive temperature. By assembling the bearing as a whole on the bearing seat and moving the sleeve to the center of the pump shaft 1, the load distribution of the bearing can be optimized and the stability of the bearing support can be enhanced. The bearing seat can effectively support the bearing, reduce vibration and load fluctuations during operation, improve the overall stability of the pump, and reduce wear and damage caused by mechanical instability. The sleeve is moved to the center of the pump shaft, so that the mechanical properties of the pump shaft are further optimized, and the cooperation between the bearing and the pump body is more coordinated. By adopting an independent support method, assembling the bearing as a whole to the bearing seat, and adjusting the position of the sleeve to the center of the pump shaft, it can not only improve the stability of the magnetic pump under conditions such as flow interruption and idling, reduce the temperature rise of the bearing, and avoid demagnetization of the internal magnetic steel, but also enhance the overall stability and service life of the pump body, optimize the lubrication and cooling effects, and effectively improve the reliability and safety of the pump.

[0030] In the original design, the bearings rely on working media such as lubricating fluid for lubrication and cooling. When there is a break in the material, flow interruption or idling, the lubricating fluid supply is insufficient, causing the bearing to overheat, which in turn affects the magnetism of the inner magnet. This solution assembles the outer ring 4 of the bearing as a whole on the inside of the pump cover 2. In this way, the structural design of the pump 2 cover itself can be used to optimize the flow and cooling effect of the lubricating fluid. Even in abnormal situations, the cooling and lubrication of the bearing are still guaranteed, avoiding the impact of excessive temperature on the performance of the magnetic pump. Excessive temperature in the original structure may cause the inner magnet to lose its magnetism and affect the normal operation of the pump. The new design reduces the risk of the magnet losing its magnetism due to overheating by improving the heat dissipation and lubrication of the bearing, thereby ensuring the stability and long-term working performance of the magnetic pump. By adopting an independent support method, the pump cover 5 is equivalent to a bearing seat, making the support point of the bearing outer ring 4 more stable. The original support through the contact between the bearing inner and outer rings 4 and the pump body and the sleeve may cause unstable operation due to bearing wear and offset. The new support design directly assembles the bearing outer ring 4 on the pump cover 5, effectively enhancing the stability of the bearing and reducing the risk of vibration and offset.

[0031] Specifically, the independent support method avoids excessive wear of the bearings due to insufficient lubrication during operation, especially in the case of idling or flow interruption, the bearings can still maintain good lubrication and cooling, thereby extending the service life of the bearings. The pump cover 5 is equivalent to the bearing seat. Since the bearing seat is designed as an independent component, it becomes easier to maintain and replace the bearings. When the magnetic pump needs to be inspected and replaced, the bearing seat can be more easily disassembled, reducing maintenance time and improving the reliability and continuous operation of the pump. The new support method reduces the vibration, noise or performance degradation of the pump body caused by bearing problems that may occur in traditional designs. Since the bearings are better supported and lubricated, the magnetic pump can operate stably for a longer period of time, reducing the frequency of maintenance and maintenance costs. This new independent support method improves the overall performance, life and reliability of the magnetic pump by improving the stability of the bearing, optimizing lubrication and temperature control, and ensuring that the magnetism of the internal magnetic steel is not affected, especially the adaptability performance under abnormal working conditions.

[0032] like Figure 1 and Figure 2 As shown, a plurality of guide grooves 6 are provided inside the bearing outer ring 4, and a mounting groove 7 is provided outside the bearing outer ring 4; lubricating liquid and air can be introduced between the bearing outer ring 4 and the bearing inner ring 3 through the guide grooves 6. When the lubricating liquid flows in normally, the lubricating liquid can flow into the bearing outer ring 4 and the bearing inner ring 3 through the guide grooves 6, and lubricate and cool the bearing outer ring 4 and the bearing inner ring 3. When the pump is disconnected and idling, the incoming air can be introduced into the bearing outer ring 4 and the bearing inner ring 3 through the guide grooves 6 pre-opened inside the bearing outer ring 4, and the air entering the pump cavity can be introduced into the working area of ​​the inner and outer rings of the sliding bearing. The incoming air forms an air layer between the bearing outer ring 4 and the bearing inner ring 3, thereby forming a good protective surface for the bearing inner ring 3, and can effectively control the direct contact between the bearing inner ring 3 and the bearing outer ring 4, so that the bearing inner ring 3 maintains a relative distance with respect to the bearing outer ring 4, so that the rotating component will not form a high temperature due to material interruption, and the high-temperature failure of the internal magnetic steel is avoided.

[0033] like Figure 1 and Figure 2 As shown, a flow hole 8 is opened on the pump cover 5, and a limit pin 9 matched with the mounting groove 7 is arranged on the inner side of the pump cover 5; there are multiple flow holes 8, and the lubricating liquid and air are passed between the pump cover 5 and the pump body 12 through the flow holes 8, and then the lubricating liquid and air enter between the bearing outer ring 4 and the bearing inner ring 3 through the flow holes 8, and the bearing outer ring 4 is conveniently assembled through the mounting groove 7 and the limit pin 9.

[0034] like Figure 3 and Figure 5As shown, a plurality of guide grooves 6 are arranged at equal intervals. The guide grooves 6 are arc-shaped grooves, and the diameter of the opening of the guide groove 6 gradually decreases toward the end of the pump shaft 1.

[0035] In the present invention, the arc-shaped design of the guide groove 6 and the structure in which the opening gradually decreases toward the end of the pump shaft contribute to the stability of the air flow. The arc-shaped groove 6 can guide the air flow under different flow rates and pressure conditions to ensure that the air can be evenly distributed to the bearing area when the flow is cut off or idling. In addition, the gradual reduction of the opening helps to enhance the compression effect of the air flow, ensure that the air flow inside the guide groove 6 is more concentrated, thereby increasing the protective effect of the air on the bearing. The uniform distribution of the spacing of the guide groove 6 makes the air flow more uniform, avoiding uneven wear caused by excessive local temperature. Not only does it improve the stability of the system, but it also increases the service life of the bearing.

[0036] Among them, there are four guide grooves 6, and the flow hole 8 is located at the end of the guide groove 6 with a larger opening diameter; through the flow hole 8 located at the end of the guide groove 6 with a larger opening diameter, the speed at which the lubricating liquid and air enter between the bearing inner ring 3 and the bearing outer ring 4 can be accelerated.

[0037] like Figure 1 and Figure 6 As shown, the bearing outer ring 4 includes a first outer ring 41 and a second outer ring 42 , and the flow hole 8 is located between the first outer ring 41 and the second outer ring 42 .

[0038] In the present invention, the flow hole 8 is arranged between the first outer ring 41 and the second outer ring 42 to help optimize the flow path of the fluid. The flow hole 8 is located between the two outer rings, which can achieve more uniform and efficient fluid distribution, reduce fluid resistance and turbulence, and enable the fluid in the pump body 12 to flow more smoothly. The flow hole 8 arranged between the two outer rings of the bearing outer ring 4 makes the flow of the fluid smoother and more orderly, and can more effectively take away the heat generated at the bearing, which helps to reduce the operating temperature of the bearing and avoid bearing damage caused by overheating, thereby increasing the service life of the pump. Especially under high-load conditions such as dry grinding or idling, the rate of air flow between the bearing outer ring 4 and the bearing inner ring 3 can be accelerated. The structural design between the first outer ring 41 and the second outer ring 42 can further enhance the support and stability of the bearing. Through this stacked design, not only can the inner and outer rotors be better fixed and supported, but also a stronger sealing effect can be provided to prevent fluid leakage and ensure the normal operation of the pump.

[0039] The second aspect of the present invention provides a dry-wear resistant magnetic pump, which has a rotor assembly and also includes an external magnetic rotor 10, the external magnetic rotor 10 is connected to the motor 11, the motor 11 is connected to the pump body 12, the internal channel 13 of the pump body 12 is connected to the pump cover 5, the pump body 12 is provided with an impeller 14 connected to the pump shaft 1, the pump body 12 is provided with a cooling groove 15 on the outside, and the cooling groove 15 is provided with a water inlet 16; the external magnetic rotor 10 is driven to rotate by the motor 11, which can drive the internal magnetic rotor 2 to rotate, and then drive the pump shaft 1 and the impeller 14 connected thereto to work, and coolant can be introduced into the cooling groove 15 through the water inlet 16 to cool the pump body 12.

[0040] Working principle: By adding a pump cover 5, the pump cover 5 is equivalent to the bearing seat. By designing the bearing seat independently and assembling the bearing as a whole, it can better contact with the lubricating fluid. Due to the independence of the bearing seat, it can effectively increase the flow area and flow speed of the lubricating fluid, thereby enhancing the lubrication and cooling effect, and reducing the temperature rise caused by insufficient lubrication. This helps to keep the temperature of the bearing part stable when the pump is cut off, idling, etc., and avoid failures caused by overheating. By adjusting the position of the bearing support, the temperature and working environment of the bearing are more stable, especially the improvement of the lubrication and cooling effect, which can avoid the temperature rise caused by overheating of the bearing, thereby reducing the risk of the internal magnetic steel losing its magnetism due to excessive temperature. By assembling the bearing as a whole on the bearing seat and moving the sleeve to the center of the pump shaft 1, the load distribution of the bearing can be optimized and the stability of the bearing support can be enhanced. The bearing seat can effectively support the bearing, reduce vibration and load fluctuations during operation, improve the overall stability of the pump, and reduce wear and damage caused by mechanical instability. Move the sleeve to the center of the pump shaft.

[0041] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0042] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A rotor assembly, characterized in that: include: A pump shaft (1), one end of which is connected to an inner magnetic rotor (2); A bearing inner ring (3), wherein the bearing inner ring (3) is sleeved on the middle part of the pump shaft (1); A bearing outer ring (4), wherein the bearing outer ring (4) is sleeved on the bearing inner ring (3), and the bearing outer ring (4) is integrally assembled on the inner side of the pump cover (5).

2. The rotor assembly according to claim 1, characterized in that: A plurality of guide grooves (6) are provided inside the bearing outer ring (4), and a mounting groove (7) is provided outside the bearing outer ring (4).

3. The rotor assembly according to claim 1, characterized in that: The pump cover (5) is provided with a flow hole (8), and the inner side of the pump cover (5) is provided with a limit pin (9) matched with the installation groove (7).

4. The rotor assembly according to claim 2, characterized in that: A plurality of guide grooves (6) are arranged at equal intervals, and the guide grooves (6) are arc-shaped grooves.

5. The rotor assembly according to claim 4, characterized in that: The diameter of the opening of the guide groove (6) gradually decreases towards the end of the pump shaft (1).

6. The rotor assembly according to claim 4, characterized in that: Four guide grooves (6) are provided.

7. The rotor assembly according to claim 3, characterized in that: The flow hole (8) is located at the end of the guide groove (6) with a larger opening diameter.

8. The rotor assembly according to claim 3, characterized in that: The bearing outer ring (4) comprises a first outer ring (41) and a second outer ring (42), and the flow hole (8) is located between the first outer ring (41) and the second outer ring (42).

9. A dry wear resistant magnetic pump, characterized in that: The dry wear resistant magnetic pump has a rotor assembly as described in any one of claims 1 to 8, and also includes an external magnetic rotor (10), the external magnetic rotor (10) is connected to the motor (11), the motor (11) is connected to the pump body (12), the inside of the pump body (12) is connected to the pump cover (5) through a sealing gasket (13), and the inside of the pump body (12) is provided with an impeller (14) connected to the pump shaft (1).

10. The dry wear resistant magnetic pump according to claim 9, characterized in that: A cooling groove (15) is arranged outside the pump body (12), and a water inlet (16) is arranged on the cooling groove (15).

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