Vortex magnetic drive pump capable of reducing axial movement of pump shaft

Abstract

The utility model belongs to the technical field of non-variable-capacity pumps, and relates to a vortex magnetic drive pump capable of reducing axial movement of a pump shaft, which comprises a pump body, a front end cover, an impeller, the pump shaft, a motor, an inner magnetic rotor, an outer magnetic rotor, an isolation sleeve, a sliding bearing assembly, a first check ring and a second check ring, a containing cavity is arranged at the front end of the pump body, and the impeller is arranged in the containing cavity; the pump shaft is installed in the pump body through a sliding bearing assembly, one end of the pump shaft is connected with the impeller, the impeller has the moving allowance in the axial direction, and the other end of the pump shaft is connected with the inner magnetic rotor. The outer magnetic rotor is installed on a motor shaft of the motor, and the isolation sleeve is located between the inner magnetic rotor and the outer magnetic rotor. A limiting table is arranged at the end, close to the impeller, of the pump shaft, the first check ring is installed between the sliding bearing assembly and the limiting table, and the second check ring is arranged between the inner magnetic rotor and the sliding bearing assembly. According to the sliding bearing, a thrust bearing does not need to be installed, the radial friction problem between the sliding bearing and the thrust bearing can be avoided, and the production and maintenance cost is reduced.

Description

Technical Field

[0001] The utility model relates to a vortex magnetic pump capable of reducing the axial movement of a pump shaft, and belongs to the technical field of non-variable displacement pumps. Background Art

[0002] As a key fluid conveying equipment, vortex magnetic pumps are widely used in situations that require leak-free, corrosion-resistant and high-efficiency transmission. When the vortex magnetic pump is in operation, the flow of liquid inside the impeller is complex, especially the change in the direction of liquid flow, which will inevitably generate axial thrust. If this axial thrust is not effectively absorbed or balanced, it will directly affect the operating stability of the centrifugal pump and even cause vibration, noise and damage to mechanical components, seriously affecting the service life and efficiency of the pump. In order to deal with the axial thrust problem, the existing solution is to install the driven shaft through a sliding bearing and a thrust bearing. The sliding bearing is used to bear radial loads, and the thrust bearing is mainly used to bear axial loads. When axial thrust is generated, the thrust bearing can balance the axial thrust.

[0003] However, during use, radial friction between the thrust bearing assembly and the sliding bearing assembly causes wear of parts of the thrust bearing assembly and the sliding bearing assembly, requiring regular maintenance, which increases production and maintenance costs. Utility Model Content

[0004] The purpose of the utility model is to provide a new technical solution to improve or solve the technical problems existing in the prior art as described above.

[0005] The technical solution provided by the utility model is as follows: a vortex magnetic pump for reducing axial movement of a pump shaft, comprising a pump body and a front end cover, the front end cover being detachably mounted on the front end of the pump body, and further comprising an impeller, a pump shaft, a motor, an inner magnetic rotor, an outer magnetic rotor, an isolating sleeve, at least one sliding bearing assembly, a first retaining ring and a second retaining ring, a cavity being provided at the front end of the pump body, the impeller being arranged in the cavity; the pump shaft being mounted in the pump body through the sliding bearing assembly, the sliding bearing assembly being used to support the rotation of the pump shaft, one end of the pump shaft being connected to the impeller, and the impeller having an axial movable margin , the other end of the pump shaft is connected to the inner magnetic rotor; the outer magnetic rotor is mounted on the motor shaft of the motor, the isolation sleeve is located between the inner magnetic rotor and the outer magnetic rotor, the open end of the isolation sleeve is fixed to the pump body, and the outer magnetic rotor and the inner magnetic rotor are transmitted contactlessly by magnetic force; a limit platform is provided on the end of the pump shaft close to the impeller, the first retaining ring is installed between the sliding bearing assembly and the limit platform, and the second retaining ring is arranged between the inner magnetic rotor and the sliding bearing assembly, and the first retaining ring and the second retaining ring can rotate with the pump shaft but cannot move along the pump shaft.

[0006] The technical solution provided by the present utility model has the following beneficial effects compared with the prior art: By cooperating the first retaining ring, the second retaining ring with the sliding bearing assembly, while supporting the rotation of the pump shaft, the axial movement of the pump shaft is restricted, and only the axial movement allowance of the impeller is used to balance and absorb the axial thrust generated by the liquid flow. In this way, there is no need to install a thrust bearing, which can effectively avoid the radial friction problem between the sliding bearing and the thrust bearing, not only reducing the production cost and improving the cost performance of the pump, but also reducing the maintenance cost.

[0007] Based on the above technical solution, the present utility model can be further improved as follows.

[0008] Further, the impeller is installed at the front end of the pump shaft through a key.

[0009] The beneficial effect of adopting the above further solution is that by installing the impeller in the way of key connection, when the circumferential thrust is generated by the liquid flow, the impeller can move along the pump shaft to balance the thrust, and at the same time, the key connection method can also ensure the stability and reliability of the impeller during high-speed rotation.

[0010] Further, the sliding bearing assembly includes a sliding bearing seat, a sliding bearing and a bushing. The sliding bearing seat is fixed on the pump body, the bushing is sleeved on the pump shaft, and the sliding bearing is arranged between the sliding bearing seat and the bushing.

[0011] The beneficial effect of adopting the above further solution is that during operation, a certain thickness of "oil film" will be generated between the sliding bearing and the bushing, and this "oil film" can play a role in supporting the shaft, reducing friction and wear.

[0012] Further, it also includes a sheath, the sheath is sleeved on the pump shaft, and the sheath is located between the pump shaft and the sliding bearing assembly.

[0013] The beneficial effect of adopting the above further solution is that the setting of the sheath not only enhances the support and protection of the pump shaft, but also plays a role in dust prevention and pollution prevention, preventing external impurities from entering the inside of the sliding bearing assembly, thereby ensuring the cleanliness and operation accuracy of the bearing, and reducing the failures and maintenance times caused by the intrusion of impurities.

[0014] Further, it also includes a bracket, one end of the bracket is connected to the pump body, and the other end of the bracket is connected to the flange of the motor.

[0015] The beneficial effect of adopting the above further solution is that the design of the bracket enhances the connection strength between the pump body and the motor, ensuring the stability and safety of the entire vortex magnetic pump during operation. At the same time, it also facilitates the installation and disassembly of the pump, improving the maintenance efficiency.

[0016] Further, a cooling channel is also provided on the pump body. The cooling channel is communicated with the inner cavity of the isolation sleeve. The inside of the pump shaft is of a hollow structure. The cavity of the pump body is communicated with the inner cavity of the isolation sleeve through the cooling channel and the hollow structure inside the pump shaft.

[0017] The beneficial effect of adopting the above further scheme is that the low-temperature liquid in the cavity can be guided to the inner cavity of the isolation sleeve through the cooling channel, realizing effective cooling of the isolation sleeve and the working areas of the inner and outer magnetic rotors, reducing the demagnetization risk of the magnetic rotors caused by high temperature. At the same time, the cooled liquid flows back to the cavity through the hollow structure inside the pump shaft, forming a closed-loop cooling circulation system.

[0018] Further, both ends of the inner magnetic rotor are limited and installed on the pump shaft through nuts and the second retaining ring.

[0019] The beneficial effect of adopting the above further scheme is that this limited installation method ensures the precise positioning and stable connection of the inner magnetic rotor on the pump shaft, avoiding the shaking and offset of the inner magnetic rotor during high-speed rotation, thus ensuring the accuracy and reliability of magnetic drive.

[0020] Further, a check washer is also provided between the nut and the inner magnetic rotor.

[0021] The beneficial effect of adopting the above further scheme is that the check washer prevents the nut from loosening and falling off during the vibration of the pump shaft or long-term operation, enhancing the stability of the connection between the inner magnetic rotor and the pump shaft and ensuring the long-term stable operation of the pump.

[0022] Further, it includes a plurality of sliding bearing assemblies, and a spacer sleeve is provided between adjacent two sliding bearing assemblies. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0024] Figure 1 It is a three-dimensional view of the vortex magnetic pump for reducing the axial end play of the pump shaft of the present invention;

[0025] Figure 2 It is a sectional view of the vortex magnetic pump for reducing the axial end play of the pump shaft of the present invention;

[0026] In the figure, 1 is the pump body; 2 is the front end cover; 3 is the impeller; 41 is the first retaining ring; 42 is the second retaining ring; 5 is the sliding bearing assembly; 51 is the sliding bearing seat; 52 is the sliding bearing; 53 is the shaft sleeve; 6 is the limiting platform; 7 is the motor; 8 is the inner magnetic rotor; 9 is the outer magnetic rotor; 10 is the isolation sleeve; 11 is the bracket; 12 is the nut; 13 is the lock washer; 14 is the pump shaft; 15 is the sheath. Detailed implementation manners

[0027] The serial numbers assigned to the components in this text, such as "first", "second", etc., are only used to distinguish the described objects and do not imply any priority in order or specific technical meaning. In addition, the concepts of "connection" and "coupling" mentioned in this application, unless otherwise specifically stated, are both considered to include two cases: direct connection (coupling) and indirect connection (coupling).

[0028] When interpreting the description of this application, it is necessary to clarify that the orientation or positional relationship indicated by terms such as "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the perspective and layout shown in the drawings, aiming to facilitate the description and simplify the description process, rather than an absolute limitation on the actual orientation, construction method, and operation mode of the described device or component. Therefore, these terms should not be construed as restrictive interpretations of the content of this application.

[0029] The principles and features of the present utility model are described below in conjunction with examples. The examples given are only used to explain the present utility model and are not used to limit the scope of the present utility model.

[0030] Such as Figure 1 and Figure 2As shown in the figure, a vortex magnetic pump for reducing the axial displacement of the pump shaft includes a pump body 1 and a front end cover 2. The front end cover 2 is detachably installed at the front end of the pump body 1. It also includes an impeller 3, a pump shaft 14, a motor 7, an inner magnetic rotor 8, an outer magnetic rotor 9, a separation sleeve 10, at least one sliding bearing assembly 5, a first retaining ring 41 and a second retaining ring 42. A cavity is formed at the front end of the pump body 1, and the impeller 3 is arranged in the cavity. The pump shaft 14 is installed in the pump body 1 through the sliding bearing assembly 5. The sliding bearing assembly 5 is used to support the rotation of the pump shaft 14. One end of the pump shaft 14 is connected to the impeller 3, and the impeller 3 has an axial movement allowance. The other end of the pump shaft 14 is connected to the inner magnetic rotor 8. The outer magnetic rotor 9 is installed on the motor shaft of the motor 7. The separation sleeve 10 is located between the inner magnetic rotor 8 and the outer magnetic rotor 9. The open end of the separation sleeve 10 is fixed on the pump body 1. The outer magnetic rotor 9 and the inner magnetic rotor 8 are driven without contact by magnetic force. A limiting platform 6 is arranged at one end of the pump shaft 14 close to the impeller 3. The first retaining ring 41 is installed between the sliding bearing assembly 5 and the limiting platform 6. The second retaining ring 42 is arranged between the inner magnetic rotor 8 and the sliding bearing assembly 5. The first retaining ring 41 and the second retaining ring 42 can rotate with the pump shaft 14 but cannot move along the pump shaft 14.

[0031] More specifically, the impeller 3 is installed at the front end of the pump shaft 14 through a key. By using the key connection method to install the impeller 3, when the circumferential thrust is generated by the liquid flow, the impeller 3 can move along the pump shaft 14 to balance the thrust. At the same time, the key connection method can also ensure the stability and reliability of the impeller 3 during high-speed rotation.

[0032] The sliding bearing assembly 5 includes a sliding bearing seat 51, a sliding bearing 52 and a shaft sleeve 53. The sliding bearing seat 51 is fixed on the pump body 1. The shaft sleeve 53 is sleeved on the pump shaft 14. The sliding bearing 52 is arranged between the sliding bearing seat 51 and the shaft sleeve 53. During operation, a certain thickness of "oil film" will be generated between the sliding bearing and the shaft sleeve. This layer of "oil film" can play a role in supporting the shaft, reducing friction and wear.

[0033] The vortex magnetic pump for reducing the axial displacement of the pump shaft further includes a sheath 15. The sheath 15 is sleeved on the pump shaft 14, and the sheath 15 is located between the pump shaft 14 and the sliding bearing assembly 5. The setting of the sheath 15 not only enhances the support and protection of the pump shaft 14, but also plays a role in dust prevention and pollution prevention, preventing external impurities from entering the inside of the sliding bearing assembly 5, thereby ensuring the cleanliness and operation accuracy of the bearing, and reducing the failures and maintenance times caused by the intrusion of impurities.

[0034] The vortex magnetic pump for reducing the axial end play of the pump shaft further includes a bracket 11. One end of the bracket 11 is connected to the pump body 1, and the other end of the bracket 11 is connected to the flange of the motor 7. The design of the bracket 11 enhances the connection strength between the pump body 1 and the motor 7, ensuring the stability and safety of the entire vortex magnetic pump during operation. At the same time, it also facilitates the installation and disassembly of the pump, improving the maintenance efficiency.

[0035] The pump body 1 is also provided with a cooling channel, which is communicated with the inner cavity of the isolation sleeve 10. The inside of the pump shaft 14 is a hollow structure, and the cavity of the pump body 1 is communicated with the inner cavity of the isolation sleeve 10 through the cooling channel and the hollow structure inside the pump shaft 14. Through the cooling channel, the low-temperature liquid in the cavity can be guided to the inner cavity of the isolation sleeve 10, realizing the effective cooling of the isolation sleeve 10 and the working areas of the inner and outer magnetic rotors 9, reducing the demagnetization risk of the magnetic rotors caused by high temperature. At the same time, the cooled liquid flows back to the cavity through the hollow structure inside the pump shaft 14, forming a closed-loop cooling circulation system.

[0036] Both ends of the inner magnetic rotor 8 are limited and installed on the pump shaft 14 through nuts 12 and the second retaining ring 42. This limited installation method ensures the precise positioning and stable connection of the inner magnetic rotor 8 on the pump shaft 14, avoiding the shaking and offset of the inner magnetic rotor 8 during high-speed rotation, thus ensuring the accuracy and reliability of magnetic drive.

[0037] There is also a lock washer 13 between the nut 12 and the inner magnetic rotor 8. The lock washer 13 prevents the nut 12 from loosening and falling off during the vibration of the pump shaft 14 or long-term operation, enhancing the stability of the connection between the inner magnetic rotor 8 and the pump shaft 14, and ensuring the long-term stable operation of the pump.

[0038] The embodiment of the present utility model does not set a specific limit on the number of the sliding bearing assemblies 5, that is, one or more sliding bearing assemblies 5 can be configured according to actual needs. In the case where the pump shaft is relatively short, in order to ensure the coaxiality of the pump shaft, improve the rotation accuracy, and reduce the cumulative coaxiality tolerance generated by the fixation of the two bearings, only one sliding bearing assembly 5 can be installed. However, when the pump shaft is long, in order to enhance the support effect and ensure the stable operation of the pump shaft, multiple sliding bearing assemblies 5 can be installed. In these cases, a spacer sleeve (not shown in the drawings) should be provided between two adjacent sliding bearing assemblies 5 to separate them and maintain an appropriate distance. This can not only effectively disperse the load but also avoid potential problems caused by direct contact between the bearings, such as increased friction and temperature rise, thus further ensuring the long-term stable operation of the pump.

[0039] The utility model is cooperated with a sliding bearing assembly 5 through a first retaining ring 41 and a second retaining ring 42, while supporting the rotation of the pump shaft 14, restricting the axial movement of the pump shaft 14. Only the axial movement allowance of the impeller 3 is used to balance and absorb the axial thrust generated by the liquid flow. In this way, there is no need to install a thrust bearing, which can effectively avoid the radial friction problem between the sliding bearing and the thrust bearing, not only reducing the production cost, improving the cost performance of the pump, but also reducing the maintenance cost.

[0040] The above are only the preferred embodiments of the utility model and are not intended to limit the utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A vortex magnetic pump for reducing axial movement of a pump shaft, comprising a pump body (1) and a front end cover (2), the front end cover (2) being detachably mounted at the front end of the pump body (1), characterized in that, It further includes an impeller (3), a pump shaft (14), a motor (7), an inner magnetic rotor (8), an outer magnetic rotor (9), a spacer sleeve (10), at least one sliding bearing assembly (5), a first retaining ring (41) and a second retaining ring (42). A cavity is formed at the front end of the pump body (1), and the impeller (3) is arranged in the cavity; the pump shaft (14) is installed in the pump body (1) through the sliding bearing assembly (5), and the sliding bearing assembly (5) is used to support the rotation of the pump shaft (14). One end of the pump shaft (14) is connected to the impeller (3), and the impeller (3) has an axial movement allowance. The other end of the pump shaft (14) is connected to the inner magnetic rotor (8); the outer magnetic rotor (9) is installed on the motor shaft of the motor (7), the spacer sleeve (10) is located between the inner magnetic rotor (8) and the outer magnetic rotor (9), and the open end of the spacer sleeve (10) is fixed on the pump body (1). The outer magnetic rotor (9) and the inner magnetic rotor (8) are driven without contact by magnetic force; a limiting platform (6) is provided at one end of the pump shaft (14) close to the impeller (3), the first retaining ring (41) is installed between the sliding bearing assembly (5) and the limiting platform (6), and the second retaining ring (42) is arranged between the inner magnetic rotor (8) and the sliding bearing assembly (5). The first retaining ring (41) and the second retaining ring (42) can rotate with the pump shaft (14) but cannot move along the pump shaft (14).

2. The vortex magnetic pump for reducing axial displacement of the pump shaft according to claim 1, characterized in that, The impeller (3) is installed at the front end of the pump shaft (14) through a key.

3. The vortex magnetic pump for reducing the axial displacement of the pump shaft according to claim 2, characterized in that, The sliding bearing assembly (5) includes a sliding bearing seat (51), a sliding bearing (52) and a bushing (53). The sliding bearing seat (51) is fixed on the pump body (1), the bushing (53) is sleeved on the pump shaft (14), and the sliding bearing (52) is arranged between the sliding bearing seat (51) and the bushing (53).

4. The vortex magnetic pump for reducing the axial movement of the pump shaft according to claim 3, characterized in that, It further includes a sheath (15), the sheath (15) is sleeved on the pump shaft (14), and the sheath (15) is located between the pump shaft (14) and the sliding bearing assembly (5).

5. The vortex magnetic pump for reducing axial movement of the pump shaft according to claim 1, characterized in that, It further includes a bracket (11), one end of the bracket (11) is connected to the pump body (1), and the other end of the bracket (11) is flange-connected to the motor (7).

6. The vortex magnetic pump for reducing axial displacement of the pump shaft according to claim 1, wherein, A cooling channel is also formed on the pump body (1), the cooling channel is communicated with the inner cavity of the spacer sleeve (10), the inside of the pump shaft (14) is a hollow structure, and the cavity of the pump body (1) is communicated with the inner cavity of the spacer sleeve (10) through the cooling channel and the hollow structure inside the pump shaft (14).

7. The vortex magnetic pump for reducing axial end play of a pump shaft according to claim 1, wherein Both ends of the inner magnetic rotor (8) are limited and installed on the pump shaft (14) through nuts (12) and the second retaining ring (42).

8. The vortex magnetic pump for reducing axial movement of the pump shaft according to claim 7, wherein, There is also a lock washer (13) between the nut (12) and the inner magnetic rotor (8).

9. The vortex magnetic pump for reducing the axial displacement of the pump shaft according to claim 1, wherein It includes a plurality of sliding bearing assemblies (5), and a spacer sleeve is provided between two adjacent sliding bearing assemblies (5).

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