Shaftless silent pump with integrated rotor

Abstract

The application discloses a shaftless silent pump with an integrated rotor, which comprises a primary volute assembly, a front bearing assembly, a stator component, a double-stage rotor component, a secondary volute assembly and a rear bearing assembly. The stator component is composed of a stator shell, a stator core and front and rear flanges; the rotor component is composed of a rotor core, primary and secondary impellers and a rotor core pressing plate into an integrated structure, the primary and secondary impellers are arranged back to back on both sides of the motor, and the front and rear bearing assemblies are respectively located on the inlet sides of the primary and secondary impellers and are installed in the primary and secondary volutes. The integrated structure of the two-stage impellers back to back and the rotor core effectively improves the overall rigidity and dynamic balance of the rotor, the front and rear bearings are respectively designed on the inlet sides of the two-stage impellers, which facilitates the overall assembly and disassembly of the pump, the lengthened impeller inlet section and the increased bearing design play different roles in the pump inlet flow state, the balance of axial force and vibration noise, and the silent effect of the product is realized.

Description

Technical Field

[0001] This invention belongs to the field of fluid machinery and engineering equipment technology, specifically relating to a shaftless silent pump with an integrated rotor. Background Technology

[0002] In conventional canned motor pumps, the iron core, impeller, front and rear shaft sleeves, and thrust disc of the canned motor rotor assembly are respectively mounted on the rotor shaft. Assembly and disassembly require each part to be assembled and disassembled separately (and the impeller is a cantilever structure).

[0003] When using a conventional canned motor pump design, the rotor shaft, front and rear thrust discs, and bushings must first be assembled and inserted into the stator assembly, then assembled and installed with the front and rear bearing housings respectively. Next, the impeller is installed onto the rotor shaft extension, and finally the pump body is installed. When bearings are worn or damaged and require replacement or repair, the impeller and front bearing housing must be removed separately before the rotor can be extracted. Because the impeller and thrust bearing assemblies need to be installed individually, it is difficult to guarantee the overall integrity of the rotor components after dynamic balancing. Furthermore, with multi-stage impellers, this not only introduces uncertainty in ensuring dynamic balancing accuracy but also results in poor overall rigidity. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of traditional canned motor pumps by proposing a shaftless silent pump with an integrated rotor. The pump body is designed as a two-stage or single-stage structure. Not only are the front and rear bearings moved from the traditional motor end to the front ring of the two-stage impeller, but the impeller and rotor are also welded together to form an integrated structure. When the pump needs maintenance, the pump rotor can be extracted as a whole, and after overall dynamic balancing, there is no need to disassemble the components. The integrated machining and assembly of the rotor effectively ensures the concentricity of the front and rear bearings, thereby improving the pump rotor rigidity, reducing vibration and noise, and bringing convenience to machining and assembly. It also reduces the axial dimension of the pump to a certain extent, thus reducing the product weight.

[0005] The objective of this invention is achieved through the following technical solution:

[0006] A shaftless silent pump with an integrated rotor includes a first-stage volute assembly, a front bearing assembly, a stator assembly, a two-stage rotor assembly, a second-stage volute assembly, and a rear bearing assembly.

[0007] The primary volute assembly includes a pump inlet flange and a primary volute.

[0008] The stator assembly comprises a stator housing, a stator core, a front stator flange, and a rear stator flange; the outer cavity of the stator housing is designed with flow channels.

[0009] The two-stage rotor assembly includes a rotor core, rotor core plates, a first-stage impeller with a front end ring, and a second-stage impeller with front and rear end rings. There are two rotor core plates, located at opposite ends of the rotor core. One rotor core plate extends hollowly along its outer diameter and is fixedly connected to the first-stage impeller with the front end ring. The other rotor core plate extends hollowly along its outer diameter and is fixedly connected to the second-stage impeller with front and rear end rings, forming an integrated rotor. The outer diameters of the first-stage impeller with the front end ring, the rotor core, and the extended core plates are identical. The rear end ring of the second-stage impeller with front and rear end rings is fitted and installed with the stator rear flange.

[0010] The secondary volute assembly includes a secondary impeller suction chamber, a secondary volute, and a pump outlet flange; the primary volute outlet, the flow channel of the stator casing, and the flow channel of the secondary impeller suction chamber correspond to each other.

[0011] The rear bearing assembly is installed in the secondary volute and is located at the inlet of the secondary impeller with front and rear end rings; the front bearing assembly is installed in the primary volute and is located at the inlet of the primary impeller with front end rings.

[0012] Furthermore, the front bearing assembly includes a front thrust bearing, a front radial guide bearing, and a front bearing sleeve; the front thrust bearing and the front radial guide bearing respectively form a friction pair with the front end face and outer circle of the first-stage impeller with the front end ring.

[0013] Furthermore, the rear bearing assembly includes a rear thrust bearing, a rear radial guide bearing, and a rear bearing sleeve; the rear thrust bearing and the rear radial guide bearing respectively form a friction pair with the front end face and outer circle of the secondary impeller with front and rear end rings.

[0014] Furthermore, the front bearing sleeve and the first-stage volute are made into an integral structure, so that the front radial guide bearing and the front thrust bearing are directly installed in the inlet section of the first-stage volute.

[0015] Furthermore, the rear bearing sleeve and the secondary volute are made into an integral structure, so that the rear radial guide bearing and the rear thrust bearing are directly installed on the secondary volute.

[0016] A shaftless silent pump with an integrated rotor includes a single-stage volute assembly, a single-stage rotor component, a front bearing assembly, a stator component, a rear bearing assembly, and a rear bearing housing.

[0017] The single-stage volute assembly includes an inlet flange, a single-stage volute, and an outlet flange;

[0018] The front bearing assembly is installed at the inlet section of the single-stage volute.

[0019] The single-stage rotor component includes a single-stage impeller with front and rear end rings, a core plate, a core, and a single-stage rotor rear bearing section. There are two core plates, which are respectively arranged at both ends of the core and extend to both ends. One core plate extends and is fixedly connected to the single-stage impeller with front and rear end rings, and the other core plate extends and is fixedly connected to the single-stage rotor rear bearing section to form an integrated rotor. The outer diameters of the core plates and the core are the same.

[0020] The stator assembly consists of a stator housing, a stator core, a front stator flange, and a rear stator flange; the rear bearing housing is mounted on the non-drive end of the motor and is connected to the rear stator flange; the rear bearing assembly is installed in the inner hole of the rear bearing housing; the rear impeller with front and rear end rings is installed in conjunction with the front stator flange.

[0021] Furthermore, the rear bearing assembly includes a rear thrust bearing, a rear radial guide bearing, and a rear bearing sleeve; the rear radial guide bearing and the rear thrust bearing respectively cooperate with the outer circle and end face of the rear bearing section of the rotor component to form a friction pair.

[0022] The beneficial effects of this invention are as follows:

[0023] (1) The traditional shielded motor structure includes front and rear bearing housings. After the motor stator and rotor are processed and assembled, they are then assembled with the pump body and impeller. This method not only increases the cumulative processing error, but also does not meet the accuracy requirements of the overall dynamic balance of the rotor. In addition, it brings inconvenience to places with weight restrictions. The present invention integrates the impeller and rotor core and changes the position of the front and rear bearing assemblies, making the rotor components integrated. The number of parts that need to be assembled is reduced. The overall rigidity is strong, and the processing and assembly do not require disassembly. This enhances the convenience of processing and maintenance of the integrated pump rotor and brings great convenience to actual production and application.

[0024] (2) The impeller of the shielded pump of the present invention is located in the middle part of the bearings on both sides, which avoids the rotor rigidity problem caused by the cantilever structure;

[0025] (3) The front ring bearing structure of the present invention increases the length of the impeller inlet section, which can improve the uniformity of the impeller inlet flow.

[0026] (4) The front ring bearing structure of the present invention has increased the bearing design and made the overall operation more stable and reliable.

[0027] (5) Based on the concept of rotor integration, this invention strengthens the overall integrity of the rotor by changing the overall structural design of the rotor and the position of the front and rear bearing assemblies. This not only improves the overall rigidity of the pump, but also simplifies installation and disassembly, bringing great convenience to actual production and application. Attached Figure Description

[0028] Figure 1This is a schematic diagram of the overall structure of the shaftless silent pump with an integrated rotor in Example 1.

[0029] Figure 2 This is a schematic diagram of the integrated rotor structure of Example 1.

[0030] Figure 3 This is a schematic diagram of the overall structure of the shaftless silent pump with an integrated rotor in Example 2.

[0031] Figure 4 This is a schematic diagram of the integrated rotor structure of Example 2.

[0032] In the diagram, 1-first-stage volute assembly, 2-front bearing assembly, 3-stator component, 4-two-stage rotor component, 5-secondary volute assembly, 6-rear bearing assembly; 7-single-stage volute assembly, 8-single-stage rotor component, 9-rear bearing housing, 101-pump inlet flange, 102-first-stage volute; 201-front thrust bearing, 202-front radial guide bearing, 203-front bearing sleeve; 301-stator housing, 302-stator core, 303-stator front flange, 304-stator rear flange; 401-with front end ring The components are: first-stage impeller, 402-rotor core pressure plate, 403-rotor core, 404-secondary impeller with front and rear end rings, 501-secondary impeller suction chamber, 502-secondary volute, 503-pump outlet flange; 601-rear thrust bearing, 602-rear radial guide bearing, 603-rear bearing sleeve; 701-inlet flange, 702-single-stage volute, 703-outlet flange; 801-single-stage impeller with front and rear end rings, 802-core pressure plate, 803-core, 804-single-stage rotor rear bearing section. Detailed Implementation

[0033] The present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments. The purpose and effects of the present invention will become clearer. It should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0034] As one implementation method, such as Figure 1 As shown, the shaftless silent pump with an integrated rotor is a two-stage centrifugal pump. The pump includes a first-stage volute assembly 1, a front bearing assembly 2, a stator assembly 3, a two-stage rotor assembly 4, a second-stage volute assembly 5, and a rear bearing assembly 6.

[0035] The first-stage volute assembly 1 includes a pump inlet flange 101 and a first-stage volute 102;

[0036] The front bearing assembly 2 includes a front thrust bearing 201, a front radial guide bearing 202, and a front bearing sleeve 203;

[0037] Stator assembly 3 is welded together from stator housing 301, stator core 302, stator front flange 303, and stator rear flange 304; double-stage rotor assembly 4, such as Figure 2 As shown, the two-stage rotor assembly consists of a rotor core 403 and rotor core plates 402 located at both ends of the rotor core 403, which extend hollowly along their outer diameter and are welded to a first-stage impeller 401 with a front end ring and a second-stage impeller 404 with front and rear end rings, respectively, forming an integrated rotor. The outer diameter of the first-stage impeller 401 with the front end ring is the same as the outer diameter of the rotor core 403 and the outer diameter of the extended core plates 402. The outer diameter of the second-stage impeller 404 with front and rear end rings is enlarged, and the rear end ring is fitted to the stator rear flange 304. The second-stage impeller is designed with a rear end ring to reduce leakage loss and balance the axial forces at both ends.

[0038] The secondary volute assembly 5 consists of a secondary impeller suction chamber 501, a secondary volute 502, and a pump outlet flange 503;

[0039] The rear bearing assembly 6 consists of a rear thrust bearing 601, a rear radial guide bearing 602, and a rear bearing sleeve 603.

[0040] The stator housing has flow channels in its outer cavity, which correspond to the flow channels of the first-stage volute outlet and the second-stage volute suction chamber, respectively; the first-stage impeller 401 and the second-stage impeller 404 are located at both ends of the stator assembly, respectively.

[0041] The front bearing assembly 2 is located at the inlet of the first-stage impeller 401 with a front inlet ring, and forms a friction pair with the outer circle and end face of the front inlet ring of the first-stage impeller;

[0042] The rear bearing assembly 6 is located at the inlet of the secondary impeller 404 with front and rear inlet rings, and forms a friction pair with the outer circle and end face of the front inlet ring of the secondary impeller;

[0043] The front bearing assembly 2 is installed at the inlet section of the first-stage volute 102;

[0044] The rear bearing assembly 6 is installed in the intake chamber section of the secondary volute 502.

[0045] Furthermore, the front bearing sleeve 203 and the first-stage volute 102 can be made into an integral structure, so that the front radial guide bearing 202 and the front thrust bearing 201 can be directly installed in the inlet section of the first-stage volute 102.

[0046] Similarly, the rear bearing sleeve 603 and the secondary volute 502 can be made into an integral structure, so that the rear radial guide bearing 602 and the rear thrust bearing 601 can be directly installed on the secondary volute 502.

[0047] The installation sequence of the shaftless silent pump in this embodiment is as follows: connect the stator component 3 with the first-stage volute assembly 1, align the outlet flow channel of the first-stage volute 102 with the flow channel of the stator housing outer cavity, then insert the integrated rotor component 4 from the other end of the stator component 3, install the front end ring of the first-stage impeller 401 with the front bearing assembly 2, then install the secondary volute assembly 5, align the secondary volute suction chamber flow channel 501 with the flow channel of the stator housing outer cavity, and simultaneously install the rear bearing assembly 6 with the front end ring of the secondary impeller 404. The rotor component 4 is axially positioned by the front and rear thrust bearings 201 and 601, and radially positioned by the front and rear radial guide bearings 202 and 602. The installation and disassembly are simple and reliable.

[0048] The working sequence of the shaftless silent pump in this embodiment is as follows: the fluid is drawn in from the pump inlet 101, and after the first-stage impeller 401 performs work, it is diffused into the first-stage volute 102 and flows along the outer cavity of the stator housing 301 into the suction chamber 501 of the secondary impeller opposite to the first-stage impeller 401. After the secondary impeller 404 performs work, it is diffused again by the secondary volute 502 and flows out to the pump outlet 503.

[0049] Therefore, the impeller and rotor of the canned pump form an integral component, which improves the machining and assembly accuracy, increases the overall rigidity of the rotor, has a reasonable and compact structure, and is stable and reliable in operation. In addition, the bearing structure at both ends improves the impeller cantilever and extends the inlet section, thus making the flow uniform.

[0050] As another implementation method, the shaftless silent pump with an integrated rotor can also separate the secondary impeller suction chamber 501, so that the rotor component 4 can be extracted as a whole without using the secondary volute 502, making installation, disassembly and maintenance more convenient.

[0051] As another implementation method, such as Figure 3 and Figure 4 As shown, the pump features an integrated rotor, which is a single-stage integrated rotor structure. This shaft-mounted silent pump includes a single-stage volute assembly 7, a single-stage rotor component 8, a front bearing assembly 2, a stator component 3, a rear bearing assembly 6, and a rear bearing housing 9. The single-stage volute assembly 7 includes an inlet flange 701, a single-stage volute 702, and an outlet flange 703. The front bearing assembly 2 is installed at the inlet section of the single-stage volute 702 and includes a front thrust bearing 201, a front radial guide bearing 202, and a front bearing sleeve 203. Figure 4As shown, the single-stage rotor component 8 includes a single-stage impeller 801 with front and rear end rings, a core pressure plate 802, an iron core 803, and a single-stage rotor rear bearing section 804. Similar to Embodiment 1, there are two core pressure plates 802, respectively arranged at both ends of the iron core 803, extending towards both ends. One core pressure plate 802 extends and is welded to the single-stage impeller 801 with front and rear end rings, while the other core pressure plate 802 extends and is welded to the single-stage rotor rear bearing section 804. The outer diameters of the core pressure plates 802 and the iron core 803 are the same, while the outer diameter of the single-stage impeller 801 with front and rear end rings is increased. The front thrust bearing 201 and the front radial guide bearing 202 respectively mate with the front end ring end face and outer circle of the single-stage impeller 801 with front and rear end rings in the single-stage rotor component 8 to form friction pairs.

[0052] The stator assembly 3 is welded together from the stator housing 301, stator core 302, stator front flange 303, and stator rear flange 304. The rear bearing housing 9 is mounted on the non-drive end of the motor and connects with the stator rear flange 304. The rear bearing assembly 6 is installed in the inner hole of the rear bearing housing 9. The rear bearing assembly 6 includes a rear thrust bearing 601, a rear radial guide bearing 602, and a rear bearing sleeve 603. The rear radial guide bearing 602 and the rear thrust bearing 601 respectively mate with the outer circle and end face of the rear bearing section 804 of the rotor assembly 8 to form a friction pair. The rear ring of the single-stage impeller 801 with front and rear end rings is fitted with the stator front flange 303. Fluid is drawn in from the pump inlet, performs work on the single-stage impeller 801 with front and rear end rings, and then diffuses through the single-stage volute 702 before flowing out of the pump outlet.

[0053] like Figure 1 and 3 As shown, the outlet of the shaftless silent pump in this embodiment of the invention is located on the side of the pump body. This is only an example; the shaftless silent pump of the present invention can be either a vertical pump or a horizontal pump.

[0054] It will be understood by those skilled in the art that the above descriptions are merely preferred examples of the invention and are not intended to limit the invention. Although the invention has been described in detail with reference to the foregoing examples, those skilled in the art can still modify the technical solutions described in the foregoing examples or make equivalent substitutions for some of the technical features. All modifications and equivalent substitutions made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A shaftless silent pump with an integrated rotor, characterized in that, It includes the first-stage volute assembly (1), the front bearing assembly (2), the stator assembly (3), the two-stage rotor assembly (4), the second-stage volute assembly (5), and the rear bearing assembly (6). The first-stage volute assembly (1) includes a pump inlet flange (101) and a first-stage volute (102). The stator component (3) comprises a stator housing (301), a stator core (302), a stator front flange (303), and a stator rear flange (304); the outer cavity of the stator housing (301) is designed with flow channels; The dual-stage rotor component (4) includes a rotor core (403), a rotor core plate (402), a first-stage impeller (401) with a front end ring, and a second-stage impeller (404) with front and rear end rings. There are two rotor core plates (402), located at both ends of the rotor core (403). One rotor core plate (402) extends hollowly along its outer diameter and is fixedly connected to the first-stage impeller (401) with a front end ring. The other rotor core plate (402) extends hollowly along its outer diameter and is fixedly connected to the second-stage impeller (404) with front and rear end rings, forming an integrated rotor. The outer diameters of the first-stage impeller (401) with a front end ring, the rotor core (403), and the extended core plate (402) are the same. The rear end ring of the second-stage impeller (404) with front and rear end rings is fitted and installed with the stator rear flange (304). The secondary volute assembly (5) includes a secondary impeller suction chamber (501), a secondary volute (502), and a pump outlet flange (503); the outlet of the primary volute (102), the flow channel of the stator housing (301), and the flow channel of the secondary impeller suction chamber (501) correspond to each other. The rear bearing assembly (6) is installed in the secondary volute (502) and located at the inlet of the secondary impeller (404) with front and rear mouth rings; the front bearing assembly (2) is installed in the primary volute (102) and located at the inlet of the primary impeller (401) with front mouth rings.

2. The shaftless silent pump with an integrated rotor according to claim 1, characterized in that, The front bearing assembly (2) includes a front thrust bearing (201), a front radial guide bearing (202), and a front bearing sleeve (203); the front thrust bearing (201) and the front radial guide bearing (202) form a friction pair with the front ring end face and outer circle of the first-stage impeller (401) with the front ring.

3. The shaftless silent pump with an integrated rotor according to claim 1, characterized in that, The rear bearing assembly (6) includes a rear thrust bearing (601), a rear radial guide bearing (602), and a rear bearing sleeve (603); the rear thrust bearing (601) and the rear radial guide bearing (602) form a friction pair with the front ring end face and outer circle of the secondary impeller (404) with front and rear rings, respectively.

4. The shaftless silent pump with an integrated rotor according to claim 2, characterized in that, The front bearing sleeve (203) and the first-stage volute (102) are integrated into one structure, so that the front radial guide bearing (202) and the front thrust bearing (201) are directly installed in the inlet section of the first-stage volute (102).

5. The shaftless silent pump with an integrated rotor according to claim 3, characterized in that, The rear bearing assembly (6) includes a rear thrust bearing (601), a rear radial guide bearing (602), and a rear bearing sleeve (603); the rear bearing sleeve (603) and the secondary volute (502) are integrated into one structure, so that the rear radial guide bearing (602) and the rear thrust bearing (601) are directly installed on the secondary volute (502).

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