A front ring supporting integrated shield pump

Abstract

The application discloses a front ring support integrated shielding pump, which comprises a driving motor rotor component, a driving motor stator component, an impeller, a front bearing assembly and a rear bearing assembly. The front bearing assembly is located at the front ring part of the impeller, and the rear bearing assembly is located at the non-driving end of the motor. The front ring support integrated shielding pump structure of the application moves the traditional shielding pump front bearing assembly from the motor driving end to the impeller inlet end, completely integrates the rotor in design and processing, realizes the integrity of the rotor, realizes the assembling and disassembling requirements without disassembling the impeller, and controls the overall dynamic balance of the rotor component. The application avoids the cantilever structure of the impeller, effectively improves the rigidity of the rotor, lengthens the impeller inlet section, and makes the inlet flow uniform.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of fluid machinery and engineering equipment, and particularly relates to a front port ring supporting integrated shield pump. BACKGROUND

[0002] The front bearing assembly and the rear bearing assembly of the existing conventional shield centrifugal pump are respectively located on both sides of the rotor iron core, and the impeller is a cantilever structure.

[0003] When the conventional shield pump is designed, the stator, the rotor and the front and rear bearing seats are first installed, and then the impeller pump body is assembled. The front bearing is located in the middle section of the shaft and the front bearing seat, and the impeller is in a cantilever state. When the bearing needs to be replaced due to wear or damage, the impeller and the front bearing seat of the motor must be disassembled first. The rotor cannot be disassembled as a whole, and it is difficult to realize the integrity of the rotor component after dynamic balancing processing. Therefore, the accuracy of dynamic balancing is uncertain. SUMMARY

[0004] The purpose of the present application is to overcome the shortcomings of the existing shield pump. The front bearing is moved from the traditional motor driving end front bearing seat part to the impeller front port ring part. When the motor and the front and rear bearing assemblies need to be replaced and repaired, the pump rotor can be extracted as a whole. After the whole dynamic balancing, the components do not need to be disassembled. The rotor is integrally processed and assembled, which effectively ensures the concentricity of the front and rear bearings, thereby improving the rotor stiffness of the pump. The front bearing seat of the traditional shield motor is removed in the overall design, which brings convenience to processing and assembly, and reduces the weight of the product.

[0005] The purpose of the present application is achieved by the following technical solutions:

[0006] A front port ring supporting integrated shield pump, characterized in that the shield pump comprises a driving motor rotor component, a driving motor stator component, an impeller, a front bearing assembly and a rear bearing assembly.

[0007] The driving motor stator component comprises a casing, a stator core, a motor front flange, a motor rear flange and a stator shield sleeve.

[0008] The driving motor rotor component comprises a rotating shaft, a rotor iron core, a thrust disc, a shaft sleeve and a rear end locking nut. The thrust disc and the shaft sleeve are matched with the non-driving end of the rotating shaft and are locked by the rear end locking nut.

[0009] The impeller is installed at the driving end of the driving motor rotor component.

[0010] The rear bearing assembly is installed at the non-driving end of the driving motor rotor component.

[0011] In order to realize the rotor integration, the driving motor rotor part can be integrally assembled and disassembled from the driving end, the front ring of the impeller extends to the pump body inlet, the front bearing assembly is installed in the space formed by the front cover plate, the front ring of the impeller and the pump body, the impeller is installed in cooperation with the front flange of the motor through the rear ring, the outer diameter of the rear ring of the impeller is not less than the inner diameter of the front flange of the motor, the inner diameter of the front flange of the motor is not less than the inner diameter of the stator shield sleeve, and the outer diameter of the rear end locking nut is not greater than the outer diameter of the shaft sleeve of the non-driving end.

[0012] Further, the front bearing assembly comprises a front thrust bearing, a front guide bearing and a front bearing sleeve, the front bearing sleeve is supported on the pump body, the front guide bearing is located in the sliding bearing pair formed by the front ring of the impeller and the front bearing sleeve, and the front thrust bearing is located in the friction pair formed by the front bearing sleeve and the front cover plate of the impeller.

[0013] Further, the rear bearing assembly comprises a rear bearing seat, a rear bearing sleeve, a rear guide bearing and a rear thrust bearing, the rear bearing seat is installed on the rear flange of the motor, the rear bearing sleeve is supported in the inner hole of the rear bearing seat, the rear guide bearing is located in the sliding bearing pair formed by the rear bearing sleeve and the shaft sleeve, and the rear thrust bearing is located between the thrust disc and the rear bearing sleeve.

[0014] Further, the front bearing sleeve and the pump body are integrated, so that the front guide bearing and the thrust bearing are directly installed on the inlet section of the pump body.

[0015] Further, the rear bearing seat and the rear bearing sleeve are integrated.

[0016] Further, the pump body is divided into a pump inlet section and a pump shell, so that the rotor part can be integrally extracted by only dismounting the pump body inlet section without using the pump shell.

[0017] Further, the impeller and the driving end of the rotating shaft are connected through a taper, so as to ensure the accurate axial positioning of the impeller and prevent loosening, and the front locking nut is used for locking.

[0018] The beneficial effects of the present application are as follows:

[0019] (1) The traditional shield motor structure comprises a front bearing seat, the motor stator and rotor are machined and assembled, and then the whole machine is assembled with the pump body and the impeller. Such a mode not only increases the machining cumulative error, but also is not conducive to the accuracy requirement of the rotor integral dynamic balance, and brings inconvenience to the places with weight limitation requirement. The present application changes the position of the front bearing assembly, so as to realize the integration of the rotor part, the machining and assembly do not need to be disassembled, the convenience of the integrated pump rotor machining and maintenance is improved, the rotor rigidity is effectively improved, and great convenience is brought to the actual production and application.

[0020] (2) The shielding pump impeller of the present application avoids the rigidity problem of the rotor caused by cantilever structure at the middle part of the two side bearings;

[0021] (3) The inlet long port ring structure proposed by the present application lengthens the length of the inlet section of the impeller, which can improve the uniformity of the flow at the inlet of the impeller;

[0022] (4) The present application starts from the idea of rotor integration, and achieves the integrity of the rotor by changing the position of the front bearing assembly, which not only improves the overall rigidity of the pump, but also brings great convenience to actual production and application. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the front port ring support integrated shielding pump of Example 1.

[0024] Figure 2 It is a schematic diagram of the rotor structure of the front port ring support integrated shielding pump of Example 1.

[0025] Figure 3 It is a schematic diagram of the front port ring support integrated shielding pump inlet flange split structure.

[0026] In the figure, 1 is the rear bearing seat, 2 is the motor rear flange, 3 is the rotor, 4 is the stator shield, 5 is the circulating pipeline, 6 is the front locking nut, 7 is the pump outlet, 8 is the pump inlet, 9 is the rear guide bearing, 10 is the rear bearing sleeve, 11 is the rear thrust bearing, 12 is the stator core, 13 is the machine shell, 14 is the motor front flange, 15 is the pump body, 16 is the impeller, 17 is the front thrust bearing, 18 is the front guide bearing, 19 is the front bearing sleeve, 20 is the rear end locking nut, 21 is the shaft sleeve, 22 is the thrust disc, 23 is the rotor core, 24 is the impeller rear port ring, 25 is the front cover plate thrust bearing, 26 is the impeller front port ring, and 27 is the pump inlet section. DETAILED DESCRIPTION

[0027] The present application will become more apparent and the purposes and effects thereof will be more clearly understood from the following detailed description of the preferred embodiments with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely intended to explain the present application and are not intended to limit the present application.

[0028] As one of the embodiments, as Figure 1As shown, the front mouth ring supports the integrated shielding pump, which is a single-stage integrated centrifugal pump. The pump comprises a rear bearing seat 1, a motor rear flange 2, a rotating shaft 3, a stator shielding sleeve 4, a circulating pipeline 5, a front locking nut 6, a pump outlet 7, a pump inlet 8, a rear guide bearing 9, a rear bearing sleeve 10, a rear thrust bearing 11, a stator core 12, a motor housing 13, a motor front flange 14, a pump body 15, an impeller 16, a front thrust bearing 17, a front guide bearing 18, a front bearing sleeve 19, a rear end locking nut 20, a shaft sleeve 21, a thrust disc 22, a rotor core 23, an impeller rear mouth ring 24, a front cover plate thrust bearing 25, and an impeller front mouth ring 26.

[0029] The motor housing 13, the stator core 12, the motor front flange 14, the motor rear flange 2, and the stator shielding sleeve 4 constitute a driving motor stator component. Figure 2 The rotating shaft 3, the rotor core 23, the thrust disc 22, the shaft sleeve 21, and the rear end locking nut 20 constitute a driving motor rotor component. The thrust disc 22 and the shaft sleeve 21 are positioned by keys at the non-driving end of the rotating shaft 3, the thrust disc 22 is limited by a shaft shoulder, and the shaft sleeve 21 and the thrust disc 22 are locked by the rear end locking nut 20. The impeller 16 is arranged at the driving end of the rotating shaft 3 and is connected with the shaft taper to ensure accurate axial positioning of the impeller and prevent loosening, and is locked by the front locking nut 6. The rear bearing assembly is installed at the non-driving end of the motor.

[0030] In order to achieve the integration of the rotor, the driving motor rotor component can be integrally assembled and disassembled from the driving end. The impeller front mouth ring 26 extends towards the pump inlet 8, and the front bearing assembly is installed in the space formed by the front cover plate of the impeller, the impeller front mouth ring 26, and the pump body 15. The impeller 14 is installed by cooperating with the motor front flange 12 through the impeller rear mouth ring 24, the outer diameter of the impeller rear mouth ring 24 is not less than the inner diameter of the motor front flange 12, the inner diameter of the motor front flange 12 is not less than the inner diameter of the stator shielding sleeve 4, and the outer diameter of the rear end locking nut 20 at the non-driving end is not greater than the outer diameter of the shaft sleeve 21 at the non-driving end.

[0031] In addition, the front bearing sleeve 19 and the pump body 15 can be an integrated structure, so that the front guide bearing 18 and the thrust bearing 17 are directly installed in the inner hole and end face of the inlet section flange of the pump body 14. Further, in order to prevent the wear of the front cover plate under different material conditions of the impeller, the front cover plate thrust bearing 25 can be further provided to form an axial friction pair with the thrust bearing 17. The rear bearing sleeve 10 and the rear bearing seat 1 can also be an integrated structure, so that the rear guide bearing 9 and the rear thrust bearing 11 are directly installed in the inner hole and end face of the rear bearing seat 1.

[0032] Fluid is sucked from the pump inlet 8, and after work by the impeller 16, it is transmitted into the pump body 15 for pressure expansion and flows out from the pump outlet 7. The circulating pipeline 5 is connected to the rear bearing seat 1 and the pump outlet 7 at both ends.

[0033] Thus, the shield pump impeller is changed from a cantilever structure to a two-end bearing structure, and the inlet section is lengthened to homogenize the flow state, and the entire rotor component is an integral whole, and machining and assembly do not need to be split; such a design is strong in integrity, reasonable and compact in structure.

[0034] As shown in Figure 3 The front ring supporting integrated shield pump of the present application can also split the pump inlet section 27 of the pump body 15 independently, so that the rotor component can be extracted as a whole without moving the pump body 15, and installation, disassembly and maintenance are more convenient.

[0035] As shown in Figure 1 and 3 The outlet of the shield pump of the embodiment of the present application is located on the side of the pump body. Here, only as an example, the front ring supporting integrated shield pump of the present application can be a vertical pump or a horizontal pump.

[0036] Those skilled in the art can understand that the above description is only a preferred example of the present application and is not intended to limit the present application, although the present application has been described in detail with reference to the foregoing examples, and those skilled in the art can still modify the technical solutions recorded in the foregoing examples or make equivalent replacements for some of the technical features. Any modification, equivalent replacement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A front-end ring-supported integrated shielded pump, characterized in that, The canned motor pump includes a drive motor rotor assembly, a drive motor stator assembly, an impeller, a front bearing assembly, and a rear bearing assembly. The drive motor stator component includes a housing, a stator core, a front flange of the motor, a rear flange of the motor, and a stator shielding sleeve; The drive motor rotor component includes a rotating shaft, a rotor core, a thrust disc, a bushing, and a rear locking nut; the thrust disc and bushing cooperate with the non-driving end of the rotating shaft and are locked by the rear locking nut. The impeller is mounted on the drive end of the rotor component of the drive motor; The rear bearing assembly is installed at the non-driving end of the rotor component of the drive motor; To achieve rotor integration, allowing the drive motor rotor assembly to be assembled and disassembled as a whole from the drive end, the front end ring of the impeller extends to the pump inlet; the front bearing assembly is installed in the space formed by the front cover plate of the impeller, the front end ring, and the pump body; the impeller is installed in conjunction with the front flange of the motor via a rear end ring, the outer diameter of the rear end ring of the impeller being no less than the inner diameter of the front flange of the motor; the inner diameter of the front flange of the motor being no less than the inner diameter of the stator shield sleeve; and the outer diameter of the rear locking nut being no greater than the outer diameter of the bushing at the non-drive end.

2. The integrated shielded pump with front ring support according to claim 1, characterized in that, The front bearing assembly includes a front thrust bearing, a front guide bearing, and a front bearing sleeve; the front bearing sleeve is supported on the pump body, the front guide bearing is located in a sliding bearing pair formed by the front end ring of the impeller and the front bearing sleeve, and the front thrust bearing is located in a friction pair formed by the front bearing sleeve and the front cover plate of the impeller.

3. The integrated shielded pump with front-end ring support according to claim 1, characterized in that, The rear bearing assembly includes a rear bearing housing, a rear bearing sleeve, a rear guide bearing, and a rear thrust bearing. The rear bearing housing is mounted on the rear flange of the motor. The rear bearing sleeve is supported in the inner hole of the rear bearing housing. The rear guide bearing is located inside the rear bearing sleeve and cooperates with the bushing to form a sliding bearing pair. The rear thrust bearing is located in the sliding bearing pair formed by the thrust disc and the rear bearing sleeve.

4. The integrated shielded pump with front-end ring support according to claim 2, characterized in that, The front bearing sleeve and the pump body are an integral structure, so that the front guide bearing and the thrust bearing are directly installed in the inlet section of the pump body.

5. The integrated shielded pump with front-end ring support according to claim 3, characterized in that, The rear bearing housing and the rear bearing sleeve are an integral structure.

6. The integrated shielded pump with front-end ring support according to claim 3, characterized in that, The pump body is divided into a pump inlet section and a pump casing, so that the rotor assembly can be extracted as a whole without moving the pump casing, only the pump inlet section needs to be removed.

7. The integrated shielded pump with front ring support according to claim 1, characterized in that, The impeller is connected to the drive end of the rotating shaft by a tapered connection to ensure accurate axial positioning of the impeller and prevent it from loosening, and is locked with a front lock nut.

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