Magnetic drive pump under condition of containing granular medium

Abstract

The utility model discloses a magnetic drive pump under the condition of containing granular media, which is characterized in that an impeller is arranged at the front end of a pump shaft, an inner magneton is arranged at the rear end of the pump shaft, a first thrust plate, a first radial bearing, a second radial bearing and a second thrust plate are sequentially sleeved on the pump shaft between the impeller and the inner magneton from front to back, a bearing bush is fixedly sleeved on the pump shaft, and the first radial bearing, the second radial bearing and the second thrust plate are fixedly sleeved on the bearing bush. The first radial bearing and the second radial bearing are sleeved outside the bearing bush, a front boss is arranged at a front opening of the impeller, a rear boss is arranged at a rear opening of the impeller, a front outer opening ring and a front inner opening ring are fixedly sleeved on the front boss, the front outer opening ring is sleeved outside the front inner opening ring in a clearance mode, and the front outer opening ring and the rear outer opening ring are fixed on the pump body. The front inner opening ring is fixedly sleeved on the front boss of the impeller, the rear outer opening ring and the rear inner opening ring are fixedly sleeved on the rear boss, the rear outer opening ring is sleeved outside the rear inner opening ring in a clearance mode, and the rear inner opening ring is fixedly sleeved on the rear boss of the impeller.

Description

Technical Field

[0001] The utility model belongs to a pump without mechanical seal, in particular to a magnetic pump structure, which adopts magnetic force transmission technology, and an external magnetic force transmission device drives a rotating component to suck liquid into a pump body and discharge it. Background Art

[0002] As a sealless centrifugal pump, the magnetic pump includes a pump body for accommodating other components and forming a fluid channel, a bearing that provides support and balance for rotational motion, a magnetic drive that transmits the rotational force of the motor to the rotor, an inner magnet and an outer magnet that provide magnetic coupling, a rotor that pushes the fluid through the pump, a blade that sucks the fluid from the low-pressure area, a pump shaft that transmits the rotational force of the magnetic coupler, and a sealing device. The magnetic pump has high sealing and reliability and can achieve liquid leakage-free transmission. However, since the magnetic pump uses the medium it transports as a lubricant, once there are hard particles in the medium, it is easy to cause wear of the pump shaft and bearings, and it is also easy to cause direct wear of the inner and outer magnets, increasing the frequency of shutdowns and maintenance. For example, in the production process of coal-to-methanol chemical products, the magnetic pump needs to transport the medium in a toxic and harmful environment, which will increase the probability of environmental safety accidents during the maintenance process. Therefore, how to ensure the stable operation of the magnetic pump under the condition of containing granular media has become an urgent problem to be solved.

[0003] A document with patent publication number CN116677613A discloses a magnetic pump, in which an isolation cover and a sealing ring are installed on the pump chamber, the front end limit of the pump shaft is installed in a circular groove, and the rear end limit is installed in a circular hole to form a simply supported beam structure, the external magnetic rotor and the composite impeller are respectively located on the front and rear sides of the isolation cover, the rear end of the external magnetic rotor is provided with an outer magnetic ring, and the front end of the composite impeller is provided with an inner magnetic ring corresponding to the outer magnetic ring, the composite impeller is installed on the positioning pump shaft through a bearing, and by changing the overall structure of the inner and outer magnetic couplers and the isolation cover, the driving magnet is prevented from falling off due to factors such as unclean conveyed medium and obstruction by inclusions during operation, thereby reducing the breakage rate of the isolation cover. However, the magnetic pump changes the overall structure of the inner and outer magnetic couplers and the isolation cover to avoid the problem of the driving magnet falling off of the inner magnetic coupler due to unclean conveyed media, obstruction by inclusions, etc. Its structure is complex and does not solve the problem of wear between the pump shaft, impeller and other components of the magnetic pump and small particles in the inclusions. The small particles still directly contact and wear with the pump shaft and impeller.

[0004] The document with patent publication number CN116498593A discloses a three-phase flow magnetic pump that can transport particles and a small amount of gas without load. A back blade is set on the rear cover plate of the impeller. At the same time, a dynamic sealing device consisting of a liner and an auxiliary impeller is set on the rear side of the impeller to form three dynamic and static rotating pairs to block solid particles from entering the rear chamber of the pump. A mechanical seal is added after the dynamic sealing device to further prevent some solid impurities that pass through the dynamic sealing device from entering the bearing cavity formed by the support body, thereby performing a secondary barrier on the solid particles. The magnetic pump has an additional rotating pair, which has a complex structure, many parts and heavy weight, and still does not solve the problem that the pump shaft in contact with the isolation liquid will wear against the particles. Summary of the invention

[0005] The utility model aims to solve the problem of wear between main components and particles when the existing magnetic pump is operated in an environment containing granular media, and proposes a magnetic pump structure suitable for use in an environment containing granular media, which can avoid wear between particles in the liquid and main components and increase the service life of the magnetic pump.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the magnetic pump under the condition of granular medium described in the utility model is: it has a pump shaft, the front end of the pump shaft is equipped with an impeller, the rear end of the pump shaft is equipped with an inner magnet, and the first thrust plate, the first radial bearing, the second radial bearing and the second thrust plate are sequentially sleeved on the pump shaft between the impeller and the inner magnet from front to back, the front and rear end surfaces of the first thrust plate, the first radial bearing, the second radial bearing and the second thrust plate are in close contact, the first radial bearing and the second radial bearing have the same structure, the bearing sleeve is fixedly sleeved on the pump shaft, the first radial bearing and the second radial bearing are sleeved outside the bearing sleeve, and the impeller A front boss is provided at the front mouth of the impeller, and a front outer ring and a front inner ring are fixedly sleeved on the front boss, the axial thickness of the front outer ring and the front inner ring are the same, the front outer ring is sleeved on the outside of the front inner ring with a gap, a gap is left between the two rings, the front outer ring is fixed on the pump body, and the front inner ring is fixedly sleeved on the front boss of the impeller; a rear boss is provided at the rear mouth of the impeller, and a rear outer ring and a rear inner ring are fixedly sleeved on the rear boss, the axial thickness of the rear outer ring and the rear inner ring are the same, the rear outer ring is sleeved on the outside of the rear inner ring with a gap, a gap is left between the two rings, the rear outer ring is fixed on the pump body, and the rear inner ring is fixedly sleeved on the rear boss of the impeller.

[0007] Preferably, a gap of 0.01-0.03 mm is left between the front outer ring and the front inner ring, and between the rear outer ring and the rear inner ring.

[0008] Preferably, the front end of the impeller is fixedly connected to the front end of the pump shaft through a locking nut and an adjusting gasket.

[0009] Preferably, the outer ring surfaces of the front inner ring and the rear inner ring are coated with a 2-5 mm magnesium-aluminum alloy coating, the end surface of the first thrust plate in contact with the first radial bearing is coated with a 3-5 mm thick babbitt alloy coating, and the end surface of the second thrust plate in contact with the second radial bearing is coated with a 3-5 mm thick babbitt alloy coating.

[0010] Preferably, a spiral guide groove is provided on the outer surface of the bearing bushing.

[0011] The advantages of the utility model after adopting the above technical solution are:

[0012] 1. Once the impeller and the pump casing rub against each other, the impeller body will be worn, and in the presence of granular media, the impeller is more likely to be worn or stuck, and the impeller needs to be replaced as a whole. The utility model installs mouth rings on both the front and rear sides of the impeller to effectively prevent damage to the impeller.

[0013] 2. The utility model designs a bearing bushing between the radial bearing and the pump shaft to avoid direct contact between the radial bearing and the pump shaft, thereby avoiding wear and tear of the corresponding position of the pump shaft and avoiding replacement of the entire pump shaft.

[0014] 3. Thrust plate components are designed on both sides of the radial bearing to protect the pump shaft.

[0015] 4. The bearing bushing is provided with a guide groove on the contact surface with the radial bearing, so that the heat generated by friction is not easily accumulated on the contact surface, which is beneficial to improve the lubrication of the radial bearing and the service life of the pump shaft and reduce the frequency of maintenance.

[0016] 5. The utility model solves the problem of using the magnetic pump in the presence of particles, especially hard particles, reduces the wear of the pump shaft, bearings, thrust plates, and between the impeller and the pump body, and can also shorten the maintenance time, reduce the accessories used in the maintenance process, and reduce the maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the utility model;

[0018] Figure 2 yes Figure 1 A schematic structural diagram of the middle bearing bushing 4;

[0019] In the figure: 1. impeller; 2. first thrust plate; 3. first radial bearing; 4. bearing bushing; 5. inner magnet; 6. locking nut; 7. front outer ring; 8. rear outer ring; 9. front inner ring; 10. rear inner ring; 11. pump shaft; 12. adjusting gasket; 13. second key; 14. first key; 15. second thrust plate; 16. second radial bearing; 17. guide groove. DETAILED DESCRIPTION

[0020] See also Figure 1 The utility model is a magnetic pump for use with a particle medium. The utility model has a pump shaft 11. An impeller 1 is installed at the front end of the pump shaft 11. The impeller 1 is fixedly sleeved on the pump shaft 11 through a first key 14. The front end of the impeller 1 is fixedly connected to the front end of the pump shaft 11 through a locking nut 6 and an adjusting gasket 12. The overall axial size is fine-tuned by adjusting the thickness of the gasket 12.

[0021] The inner magnet 5 is installed at the rear end of the pump shaft 11, and the inner magnet 5 is fixedly sleeved on the pump shaft 11 through the second key 13. On the pump shaft 11 between the impeller 1 and the inner magnet 5, the first thrust plate 2, the first radial bearing 3, the second radial bearing 16 and the second thrust plate 15 are sleeved from front to back, and the front and rear end surfaces of the first thrust plate 2, the first radial bearing 3, the second radial bearing 16 and the second thrust plate 15 are in close contact, the first radial bearing 3 and the second radial bearing 16 have the same structure, and the two bearings are installed in parallel. The inner magnet 5, the impeller 1, the first thrust plate 2, the second thrust plate 15, the first radial bearing 3, and the second radial bearing 16 are all installed inside a pump body (the fixed pump body is omitted in the figure).

[0022] The first key 14 extends backward along the length direction to the first thrust plate 2, and the first thrust plate 2 is fixedly sleeved on the pump shaft 11 through the first key 14. The first radial bearing 3 and the second radial bearing 16 are connected to the pump shaft 11 through a bearing bushing 4. The bearing bushing 4 is fixedly sleeved on the pump shaft 11, and the first radial bearing 3 and the second radial bearing 16 are sleeved outside the bearing bushing 4. The inner rings of the first radial bearing 3 and the second radial bearing 16 are rotatably connected to the bearing bushing 4. The second key 13 extends forward along the length direction to the second thrust plate 15, and the second thrust plate 15 is fixedly sleeved on the pump shaft 11 through the second key 13.

[0023] The first radial bearing 3 and the second radial bearing 16 have the same structure, and their outer diameters are both larger than the outer diameter of the first thrust plate 2 . The outer diameter of the first thrust plate 2 is larger than the outer diameter of the second thrust plate 15 .

[0024] The front mouth of the impeller 1 is provided with a front boss, on which two layers of rings are fixedly sleeved, namely, the front outer ring 7 and the front inner ring 9. The front outer ring 7 and the front inner ring 9 have the same axial thickness, and the front outer ring 7 is sleeved on the outside of the front inner ring 9 with a gap. The two rings do not contact each other in the inner and outer directions, and there is a 0.01-0.03mm installation gap between them. Among them, the front outer ring 7 is fixed on the pump body (the fixed pump body is omitted in the figure), and the front inner ring 9 is fixedly sleeved on the front boss of the impeller 1.

[0025] The rear end of the impeller 1 is provided with a rear boss, on which two layers of rings are fixedly sleeved, namely, the rear outer ring 8 and the rear inner ring 10. The axial thickness of the rear outer ring 8 and the rear inner ring 10 is the same, and the rear outer ring 8 is sleeved on the outside of the rear inner ring 10 with a gap. The two rings do not contact each other in the inner and outer directions, and there is a 0.01-0.03mm installation gap between them. Among them, the rear outer ring 8 is fixed on the pump body, and the rear inner ring 10 is fixedly sleeved on the rear boss of the impeller 1.

[0026] The outer diameters of the front inner ring 9 and the rear inner ring 10 are larger than the outer diameter of the first thrust plate 2 , and the rear end face of the rear inner ring 10 is in close contact with the front end face of the first thrust plate 2 .

[0027] The outer ring surfaces of the front inner ring 9 and the rear inner ring 10 are coated with a 2-5mm magnesium-aluminum alloy coating, and the front outer ring 7 and the rear outer ring 8 are made of stainless steel. This design can reduce the wear of the rings, and it is convenient to replace the front inner ring 9 and the rear inner ring 10 during each maintenance, without having to replace the front outer ring 7 and the rear outer ring 8.

[0028] An installation clearance of 0.015-0.025 mm is left between the first radial bearing 3, the second radial bearing 16 and the bearing bushing 4. Adding the bearing bushing 4 between the two bearings and the pump shaft 11 can avoid wear of the two bearings and the pump shaft 11. The bearing bushing 4 can be directly replaced if worn, without replacing the pump shaft 11, thereby reducing inspection time and maintenance costs.

[0029] See also Figure 2 A spiral guide groove 17 is opened on the outer surface of the bearing bushing 4. When the pump shaft 11 and the bearing bushing 4 rotate coaxially, the guide groove can increase the flow rate of the medium, increase the passing amount of the granular medium, and take away more heat generated by friction.

[0030] The first thrust plate 2 is coated with a babbitt alloy coating with a thickness of 3-5 mm on the end face in contact with the first radial bearing 3, and the second thrust plate 15 is coated with a babbitt alloy coating with a thickness of 3-5 mm on the end face in contact with the second radial bearing 16. The hardness of the babbitt alloy is appropriately matched with that of graphite, and the wear can be reduced in the presence of a granular medium during rotation, thereby meeting the strength requirements for mutual support and increasing the service life of the thrust plate and the radial bearing.

Claims

1. A magnetic pump for use in a medium containing particles, comprising a pump shaft (11), the front end of which is provided with an impeller (1), wherein: The rear end of the pump shaft (11) is provided with an inner magnet (5). A first thrust plate (2), a first radial bearing (3), a second radial bearing (16) and a second thrust plate (15) are sequentially sleeved on the pump shaft (11) between the impeller (1) and the inner magnet (5) from front to back. The front and rear end surfaces of the first thrust plate (2), the first radial bearing (3), the second radial bearing (16) and the second thrust plate (15) are in close contact. The first radial bearing (3) and the second radial bearing (16) have the same structure. The bearing bushing (4) is fixedly sleeved on the pump shaft (11). The first radial bearing (3) and the second radial bearing (16) are sleeved outside the bearing bushing (4). A front boss is provided at the front opening of the impeller (1). A front outer opening ring is fixedly sleeved on the front boss. (7) and the front inner ring (9), the front outer ring (7) and the front inner ring (9) have the same axial thickness, the front outer ring (7) is sleeved on the outside of the front inner ring (9) with a gap, a gap is left between the two rings, the front outer ring (7) is fixed on the pump body, and the front inner ring (9) is fixedly sleeved on the front boss of the impeller (1); a rear boss is provided at the rear mouth of the impeller (1), and a rear outer ring (8) and a rear inner ring (10) are fixedly sleeved on the rear boss, the rear outer ring (8) and the rear inner ring (10) have the same axial thickness, the rear outer ring (8) is sleeved on the outside of the rear inner ring (10) with a gap, a gap is left between the two rings, the rear outer ring (8) is fixed on the pump body, and the rear inner ring (10) is fixedly sleeved on the rear boss of the impeller (1).

2. A magnetic pump for use in a medium containing particles according to claim 1, characterized in that: A gap of 0.01-0.03 mm is left between the front outer ring (7) and the front inner ring (9), and between the rear outer ring (8) and the rear inner ring (10).

3. A magnetic pump for use in a medium containing particles according to claim 1, characterized in that: The front end of the impeller (1) is fixedly connected to the front end of the pump shaft (11) via a locking nut (6) and an adjusting gasket (12).

4. A magnetic pump for use in a medium containing particles according to claim 1, characterized in that: The impeller (1) is fixedly sleeved on the pump shaft (11) via a first key (14); the inner magnet (5) is fixedly sleeved on the pump shaft (11) via a second key (13); the first key (14) extends backwards along the length direction to the first thrust plate (2); the first thrust plate (2) is fixedly sleeved on the pump shaft (11) via the first key (14); the second key (13) extends forwards along the length direction to the second thrust plate (15); the second thrust plate (15) is fixedly sleeved on the pump shaft (11) via the second key (13).

5. A magnetic pump for use in a medium containing particles according to claim 1, characterized in that: The outer diameters of the first radial bearing (3) and the second radial bearing (16) are both greater than the outer diameter of the first thrust plate (2), and the outer diameter of the first thrust plate (2) is greater than the outer diameter of the second thrust plate (15).

6. A magnetic pump for use in a medium containing particles according to claim 1, characterized in that: The outer diameters of the front inner ring (9) and the rear inner ring (10) are greater than the outer diameter of the first thrust plate (2), and the rear end surface of the rear inner ring (10) is in close contact with the front end surface of the first thrust plate (2).

7. A magnetic pump for use in a granular medium according to claim 1, characterized in that: The outer ring surfaces of the front inner ring (9) and the rear inner ring (10) are coated with a 2-5 mm magnesium-aluminum alloy coating, the first thrust plate (2) is coated with a 3-5 mm thick babbitt alloy coating on the end surface in contact with the first radial bearing (3), and the second thrust plate (15) is coated with a 3-5 mm thick babbitt alloy coating on the end surface in contact with the second radial bearing (16).

8. A magnetic pump for use in a medium containing particles according to claim 1, characterized in that: The front outer ring (7) and the rear outer ring (8) are both made of stainless steel.

9. A magnetic pump for use in a medium containing particles according to claim 1, characterized in that: A gap of 0.015-0.025 mm is left between the first radial bearing (3), the second radial bearing (16) and the bearing bushing (4).

10. A magnetic pump for use in a medium containing particles according to claim 1, characterized in that: A spiral guide groove (17) is provided on the outer surface of the bearing bushing (4).

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