A permanent magnet shielded pump that is easy to assemble

Abstract

This utility model discloses a permanent magnet shielded pump that is easy to assemble. The key technical points of the solution are: a pump body, a housing, an isolation component positioned inside the housing, a rotor located inside the isolation component, a stator located outside the isolation component, a central shaft coaxially connected to the rotor, and a bearing sleeved outside the central shaft. The isolation component includes a cylindrical isolation sleeve for accommodating the rotor, a housing flange sleeved outside the isolation sleeve and fixedly connected to one end of the housing, a pump body flange coaxial with the housing flange and connecting the pump body to the housing flange, a positioning component coaxially connected to the opening end of the isolation sleeve and partially limited between the pump body and the pump body flange, and a bearing seat sleeved outside the bearing and partially limited between the positioning component and the pump body. The isolation sleeve is coaxial with the stator and penetrates the inner cavity of the stator. This solves the problems of the prior art where the rotor shifts under magnetic force during assembly, affecting installation, and the stator is easily contaminated during maintenance.

Description

Technical Field

[0001] This utility model relates to the field of shielded pump technology, and more specifically to a permanent magnet shielded pump that is easy to assemble. Background Technology

[0002] Currently, Chinese patent application number 2020105475676 discloses a permanent magnet variable frequency shielded pump, which includes an isolation assembly separating the stator and rotor. The isolation assembly includes a detachable isolation sleeve, a front partition plate located at both ends of the isolation sleeve, and a sealing rear plate. This isolation assembly ensures that the coolant inside the isolation sleeve does not contaminate the stator. The detachable design of the isolation assembly facilitates subsequent rotor maintenance. However, it has a drawback: firstly, according to its specification appendix... Figure 1 It is known that before the front partition is installed with the isolation sleeve and the stator is already fitted outside the isolation sleeve, when the rotor with magnets is subsequently inserted into the inner cavity of the isolation sleeve, the rotor and stator are magnetically attracted, causing misalignment with the center line of the isolation sleeve. Partially, the rotor adheres to the inner wall of the isolation sleeve, preventing one end of the rotor from smoothly engaging with the sealing rear plate coaxially, and the front partition cannot be coaxially connected to the other end of the rotor. This results in obstructed rotor installation and low assembly efficiency. Secondly, according to its instruction manual appendix... Figure 1 As can be seen, the stator is installed outside the isolation sleeve and is limited to the space between the sealing rear plate and the front partition plate. Therefore, during the disassembly and assembly process, the front partition plate or the sealing rear plate must be removed from one end of the isolation sleeve before the rotor can be moved out. This may result in the possibility that residual coolant in the inner cavity of the isolation sleeve may accidentally drip or splash into the space where the stator is located, causing the stator to be contaminated by coolant and other substances. The stator is prone to damage and its service life is shortened. Subsequent cleaning operations are required, resulting in cumbersome and inefficient maintenance operations. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a permanent magnet shielded pump with smooth assembly and stable stator structure.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a permanent magnet shielded pump that is easy to assemble, comprising a pump body, a housing, an isolation component positioned within the housing, a rotor located inside the isolation component, a stator located outside the isolation component, a central shaft coaxially connected to the rotor, and a bearing sleeved outside the central shaft. The isolation component includes a cylindrical isolation sleeve for accommodating the rotor, a housing flange sleeved outside the isolation sleeve and fixedly connected to one end of the housing, a pump body flange coaxial with the housing flange and connecting the pump body to the housing flange, a positioning element coaxially connected to the opening end of the isolation sleeve and partially limited between the pump body and the pump body flange, and a bearing seat sleeved outside the bearing and partially limited between the positioning element and the pump body. The isolation sleeve is coaxial with the stator and penetrates the inner cavity of the stator. By disassembling the housing flange and the pump body flange, the isolation sleeve and the rotor as a whole can move synchronously with the pump body and be removed from the housing.

[0005] As a further improvement of this utility model, the central shaft is provided with a circulation channel coaxial with itself for the coolant to flow through, and the bearing seat is provided with a circulation hole for the coolant to pass through. The coolant in the pump body flows through the circulation hole into the isolation sleeve and then flows through the circulation channel back into the pump body.

[0006] As a further improvement of this utility model, sealing gaskets are provided between the pump body and the bearing seat, and between the positioning component and the bearing seat.

[0007] As a further improvement of this utility model, the bearing seat and the positioning member facing each other are respectively provided with slots and plugs that can be inserted into each other.

[0008] As a further improvement of this utility model, it also includes a driver located at the end of the housing away from the pump body.

[0009] The beneficial effects of this utility model are as follows: By separating the housing flange and the pump body flange, the isolation sleeve and the rotor as a whole can be moved synchronously with the pump body and removed from the housing. Compared with the prior art, this design ensures that the rotor remains coaxial with the positioning point and does not deviate when passing the stator, ensuring the smoothness of the rotor assembly operation with the pump body and housing and improving assembly efficiency. Compared with the prior art, the design of the isolation sleeve moving synchronously with the pump body allows the pump body to be separated from the housing before the pump body and the isolation sleeve are separated, and can be maintained separately. This effectively avoids the phenomenon of liquid in the isolation sleeve entering the housing and soaking the stator, indirectly improving the structural stability of the stator. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of this utility model;

[0011] Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0012] Reference numerals: 1. Pump body; 2. Housing; 3. Isolation assembly; 31. Isolation sleeve; 32. Housing flange; 33. Pump body flange; 34. Positioning element; 35. Bearing housing; 36. Circulation hole; 37. Sealing gasket; 38. Slot; 39. Insert; 4. Rotor; 5. Stator; 6. Central shaft; 61. Circulation channel; 7. Bearing; 8. Driver. Detailed Implementation

[0013] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Identical components are indicated by the same reference numerals.

[0014] Reference Figure 1 and Figure 2 As shown, a permanent magnet shielded pump that is easy to assemble according to this embodiment includes a pump body 1, a housing 2, an isolation component 3 positioned inside the housing 2, a rotor 4 located inside the isolation component 3, a stator 5 located outside the isolation component 3, a central shaft 6 coaxially connected to the rotor 4, and a bearing 7 sleeved outside the central shaft 6.

[0015] Based on the aforementioned prior art, the isolation assembly 3 includes an isolation sleeve 31, a housing flange 32, a pump body flange 33, a positioning element 34, and a bearing seat 35. The isolation sleeve 31 is cylindrical and has only one opening. The positioning element 34 is coaxial with the isolation sleeve 31 and is positioned outside the isolation sleeve 31 by welding. The positioning element 34 is annular and its outer diameter matches the inner diameter of the pump body 1 port. The inner diameter of the housing flange 32 matches the outer diameter of the isolation sleeve 31. Both the housing flange 32 and the pump body flange 33 are machined with through holes and threads located on different circumferences for bolts to pass through. The central shaft 6 is a stepped shaft with diameters at both ends smaller than those in the middle. A pair of bearings 7 are fixedly fitted in the middle of the central shaft 6. The bearing housing 35 is fixedly fitted over the bearings 7. Then, the impeller and rotor 4 are fixedly fitted at both ends of the central shaft 6. The outer wall of the bearing housing 35 is integrally formed with a convex ring whose outer diameter matches the port of the pump body 1. The end of the central shaft 6 with the impeller is inserted into the pump body 1 so that the convex ring on the outer wall of the bearing housing 35 is inserted into the port of the pump body 1. The positioning member 34 is installed at the port of the pump body 1 and fits against the convex ring. The rotor 4 is located outside the pump body 1, and the isolation sleeve 31 covers the rotor 4. Then, the pump body flange 33 is fitted over the isolation sleeve 31 and contacts the positioning element 34. The pump body flange 33 is fixedly connected to the pump body 1 with bolts, so that the pump body flange 33 and the pump body 1 together clamp the bearing seat 35 and the positioning element 34. The two ends of the convex ring on the outer wall of the bearing seat 35 form a hard seal with the pump body 1 and the positioning element 34 respectively. The stator 5 is installed in the housing 2. The housing flange 32 is installed at the port of the housing 2 and fixedly connected with bolts. Finally, the pump body 1 is moved towards the housing. 2. The isolation sleeve 31 passes through the housing flange 32 and the stator 5 one after the other until the pump body flange 33 touches the housing flange 32. The threaded hole on the pump body flange 33 is connected to the through hole on the housing flange 32. The housing flange 32 and the pump body flange 33 are fixedly connected by bolts passing through the housing flange 32 and screwed into the pump body flange 33. The pump body 1 is fixed relative to the housing 2. The rotor 4 and the stator 5 are coaxial. If disassembly and maintenance are required, the housing flange 32 and the pump body flange 33 can be separated first. Then the pump body 1 or the housing 2 can be disassembled and maintained separately.

[0016] Compared with existing technologies, this design ensures that the rotor 4 remains coaxial with the positioning 5 without shifting when passing the stator 5, ensuring the smoothness of the rotor 4 during the assembly operation of the pump body 1 and the housing 2, and improving assembly efficiency. The design of the isolation sleeve 31 moving synchronously with the pump body 1, compared with existing technologies, can separate the pump body 1 from the housing 2 before the pump body 1 and the isolation sleeve 31 are separated, and can be maintained separately. This effectively prevents the liquid in the isolation sleeve 31 from entering the housing 2 and contaminating the stator 5, and indirectly improves the structural stability of the stator 5.

[0017] As one specific implementation method of the improvement, refer to Figure 1As shown, the central shaft 6 is machined with a circulation channel 61 coaxial with itself, and the bearing housing 35 is machined with multiple circulation holes 36 for coolant to pass through. During use, the coolant flows through the impeller, pump body 1, circulation holes 36, isolation sleeve 31, circulation channel 61 and finally returns to the impeller. Compared with the existing technology that uses external pipelines to complete the coolant circulation, this design can eliminate the need for external pipelines, simplify the overall structure of the permanent magnet shielded pump, and the cooling and heat dissipation action only circulates in the cavity formed by the pump body 1 and the isolation sleeve 31, effectively preventing the coolant from entering the casing 2 and soaking the stator 5, which facilitates the long-term use of the casing 2 and the stator 5 and simplifies maintenance operations.

[0018] As one specific implementation method of the improvement, refer to Figure 2 As shown, sealing gaskets 37 are provided between the pump body 1 and the bearing housing 35, as well as between the positioning component 34 and the bearing housing 35. This design can prevent coolant from leaking to the outside and effectively improve the sealing performance of the pump body 1.

[0019] As one specific implementation method of the improvement, refer to Figure 2 As shown, slots 38 and plugs 39 that can be inserted into each other are respectively provided on the facing surfaces of the bearing housing 35 and the positioning member 34. Compared with the design that only uses the planes of the bearing housing 35 and the positioning member 34 to fit together, this design can improve the coaxiality of the positioning member 34 and the bearing housing 35, and ensure that the distance between the outer wall of the rotor 4 and the inner wall of the isolation sleeve 31 remains consistent.

[0020] As one specific implementation method of the improvement, refer to Figure 1 As shown, the end cover at port 2 of the existing housing is omitted and an external driver 8 is connected. Compared with the existing technology, this design simplifies the wiring and avoids the wiring being tripped up, which would affect the use. At the same time, the structure of this utility model is more compact and the driving efficiency is higher.

[0021] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A permanent magnet shielded pump that is easy to assemble, comprising a pump body (1), a housing (2), an isolation assembly (3) positioned within the housing (2), a rotor (4) located inside the isolation assembly (3), a stator (5) located outside the isolation assembly (3), a central shaft (6) coaxially connected to the rotor (4), and a bearing (7) sleeved outside the central shaft (6), characterized in that: The isolation assembly (3) includes a cylindrical isolation sleeve (31) for accommodating the rotor, a housing flange (32) fitted outside the isolation sleeve (31) and fixedly connected to one end of the housing (2), a pump body flange (33) coaxial with the housing flange (32) and connecting the pump body (1) to the housing flange (32), a positioning element (34) coaxially connected to the opening end of the isolation sleeve (31) and partially limited between the pump body (1) and the pump body flange (33), and a bearing seat (35) fitted outside the bearing (7) and partially limited between the positioning element (34) and the pump body (1). The isolation sleeve (31) is coaxial with the stator (5) and penetrates the inner cavity of the stator (5). By separating the housing flange (32) and the pump body flange (33) from each other, the isolation sleeve (31) and the rotor (4) as a whole can move synchronously with the pump body (1) and can be removed from the housing (2).

2. The permanent magnet shielded pump that is easy to assemble according to claim 1, characterized in that: The central shaft (6) is provided with a circulation channel (61) coaxial with itself and through which coolant flows. The bearing seat (35) is provided with a circulation hole (36) through which coolant passes. The coolant in the pump body (1) flows through the circulation hole (36) into the isolation sleeve (31) and then flows through the circulation channel (61) back into the pump body (1).

3. A permanent magnet shielded pump that is easy to assemble according to claim 1 or 2, characterized in that: A sealing gasket (37) is provided between the pump body (1) and the bearing seat (35) and between the positioning component (34) and the bearing seat (35).

4. A permanent magnet shielded pump that is easy to assemble according to claim 1 or 2, characterized in that: The bearing housing (35) and the positioning member (34) facing each other are respectively provided with slots (38) and plugs (39) that can be inserted into each other.

5. A permanent magnet shielded pump that is easy to assemble according to claim 1 or 2, characterized in that: It also includes a driver (8) located at the end of the housing (2) away from the pump body (1).

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