A shielded electric pump

Abstract

A shielded electric pump comprises a pump body, a stator assembly, a pump cover, a rotor assembly accommodated in a containing cavity formed by the pump body and the pump cover, and a shaft penetratingly installed on the pump body and fixed to the rotor assembly on an axial side. The pump cover is provided with a shaft cap on an axial side facing the rotor assembly for inserting and installing the shaft. The outer circumferential surface of the shaft located in the central through hole of the rotor assembly is at least partially concave to form a first groove. The outer circumferential surface of the shaft located in the central through hole of the rotor assembly and distributed on the axial two sides of the first groove is further concave to form a plurality of annular sealing grooves. The shielded electric pump with the above design can improve the working stability and the service life of the shielded electric pump.

Description

Technical Field

[0001] This utility model relates to a shielded electric pump. Background Technology

[0002] Existing canned motor pumps typically employ two types of shaft designs: a movable shaft structure (where the shaft is fixed to the impeller and rotatably mounted on the pump body) and a fixed shaft structure (where the shaft is fixed to the pump body, and the rotor passes through and rotates around the shaft). The fixed shaft structure of the canned motor pump rotor assembly is prone to coaxiality issues and dry friction with the shaft during rotation, leading to increased vibration and noise during operation and affecting the stability and lifespan of the pump. Therefore, improvements are needed. Utility Model Content

[0003] To address the problems described in the background section, this utility model provides the following technical solution:

[0004] A shielded electric pump includes a pump body, a stator assembly fixed to the pump body, a pump cover covering the pump body, a rotor assembly housed in a cavity formed by the pump body and the pump cover, and a rotating shaft fixed to the pump body on one side axially and through which the rotor assembly passes for installation. The pump cover has a shaft cap on the side axially facing the rotor assembly for the rotating shaft to be inserted and installed. The rotating shaft is characterized in that: at least part of the outer peripheral surface of the rotating shaft located in the central through hole of the rotor assembly is recessed to form a first groove, and the outer peripheral surface of the rotating shaft located in the central through hole of the rotor assembly and distributed on both sides of the first groove on the axial sides is also recessed to form several annular sealing grooves.

[0005] The shielded electric pump of this utility model has a first inner groove and a sealing groove on the rotating shaft, which are fixed to the pump body for the rotor assembly to pass through. This design allows lubricating oil or liquid to be stored in the first inner groove for lubrication and cooling of the rotating shaft. The pump cover is provided with a shaft cap for the rotating shaft to be inserted and installed, which can reduce the impact between the rotating shaft and the rotor assembly due to shaking when the shielded electric pump is working. The shielded electric pump with the above design can improve the working stability while also ensuring the service life of the shielded electric pump.

[0006] Furthermore, the radial clearance between the shaft and the cap is provided with an elastic bushing.

[0007] Furthermore, the shielded electric pump also includes a first gasket. The rotating shaft has a first flat section L1 on the side away from the pump cover. The first gasket has a first through hole that matches the first flat section L1 and is installed on the first flat section L1 through the through hole. The pump body is injection molded with the rotating shaft and the gasket as inserts. One axial end face of the gasket is exposed outside the pump body.

[0008] Furthermore, a portion of the surface of the first flat section L1 of the rotating shaft is radially concave to form a second groove, which is then enclosed by the pump body.

[0009] Furthermore, the shielded electric pump also includes a second gasket. The rotating shaft has a second flat section L2 near the pump cover. The second gasket has a second through hole that matches the second flat section L2 and is installed on the second flat section L2 through the second through hole.

[0010] Furthermore, the second flat section L2 of the rotating shaft has a columnar mounting part with an outer diameter smaller than that of the second flat section L2 at the end facing the pump cover, and the mounting part extends into the inner cavity of the shaft cap.

[0011] Furthermore, the rotor assembly includes an annular magnetic core, a tubular bearing located within the annular magnetic core, and a mounting frame injection molded with the magnetic core and bearing as inserts. The mounting frame includes a connecting portion radially located between the magnetic core and the bearing and connecting the two, and an impeller portion located on one axial side of the connecting portion.

[0012] Furthermore, the rotor assembly also includes an impeller cover welded to the impeller section.

[0013] The more specific design and technical effects of this utility model are further explained in conjunction with the accompanying drawings in the specific embodiments. Attached Figure Description

[0014] Figure 1 This is an axial cross-sectional view of the shielded electric pump of this utility model;

[0015] Figure 2 yes Figure 1 A magnified schematic diagram of the structure of part A in the diagram;

[0016] Figure 3 yes Figure 1 A magnified schematic diagram of the partial structure of B in the diagram;

[0017] Figure 4 yes Figure 1 A partially enlarged structural diagram of C.

[0018] Figure 5 This is a three-dimensional structural diagram of the rotating shaft of this utility model;

[0019] Figure 6 This is a three-dimensional structural diagram of the first gasket of this utility model;

[0020] Figure 7 This is a three-dimensional structural diagram of the elastic bushing of this utility model;

[0021] in:

[0022] 10-Receiving cavity, 100-Pump body, 200-Stator assembly, 300-Pump cover, 310-Inlet, 320-Shaft cap, 400-Rotor assembly, 410-Magnetic core, 420-Bearing, 430-Fixing bracket, 431-Connecting part, 432-Impeller part, 500-Shaft, 510-First groove, 520-Sealing groove, 530-First flat part, 540-Second groove, 550-Second flat part, 560-Mounting part, 600-First gasket, 610-First through hole, 650-Second gasket, 700-Elastic bushing, 800-Impeller cover Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] See Figures 1 to 5 This utility model discloses a shielded electric pump, which includes a pump body 100, a stator assembly 200 fixed to the pump body 100, a pump cover 300, a rotor assembly 400, and a rotating shaft 500. The pump cover 300 has an inlet 310, an outlet (not shown), and a shaft cap 320, and is installed on one axial side of the pump body 100, forming a receiving cavity 10 with the pump body 100. The rotating shaft 400 has at least a partial recess in its radially opposite surface to the rotor assembly 400, forming a first groove 510, and its axial side is fixed to the pump body 100. The rotor assembly 400 is rotatably installed in the receiving cavity 10 through a central hole passing through the rotating shaft 500. After the pump cover 300 is installed on the pump body 100, the other axial side of the rotating shaft 500 is inserted and extends into the shaft cap 320.

[0025] The shielded electric pump of this utility model has a first inner groove 510 on the rotating shaft 500 and fixed on the pump body 100 for the rotor assembly 400 to pass through. This design allows lubricating oil or liquid to be stored in the first inner groove 510 for lubrication and cooling of the rotating shaft 500. The pump cover 300 is provided with a shaft cap 320 for the rotating shaft 500 to be inserted and installed, which can reduce the impact between the rotating shaft 500 and the rotor assembly 400 due to shaking when the shielded electric pump is working. The shielded electric pump with the above design can improve the working stability while also ensuring the service life of the shielded electric pump.

[0026] Furthermore, see Figure 1 and Figure 5The rotating shaft 500 also has a recessed surface on the radial side opposite to the rotor assembly 400, forming sealing grooves 520 distributed on both axial sides of the first groove 510. This design reduces the leakage of lubricating oil or liquid from the first inner groove 510, further improving the stability of the canned motor pump operation.

[0027] See Figure 3 and Figure 7 The canned motor pump of this invention also includes an elastic bushing 700 radially disposed between the rotating shaft 500 and the shaft cap 320. This design allows the rotating shaft 500 to self-adjust when it is inserted into the pump cover 300, reducing the likelihood of the rotating shaft 500 tilting after insertion into the pump cover 300 and causing motion interference with the rotor assembly 400, thus improving the operational stability of the canned motor pump.

[0028] See Figure 1 The rotor assembly 400 of the shielded electric pump of this invention includes an annular magnetic core 410, a tubular bearing 420 located within the annulus of the magnetic core 410, and a fixing frame 430 injection molded with the magnetic core 410 and bearing 420 as inserts. Further, the fixing frame 430 includes a connecting portion 431 radially located between the magnetic core 410 and bearing 420 and connecting the two, and an impeller portion 432 located axially on the connecting portion 431 and connected to it. This design avoids direct contact between the fixing frame 430 and the rotating shaft 500, preventing wear and damage and extending the service life of the shielded electric pump. Furthermore, the rotor assembly 400 of this invention also includes an impeller cover 800 welded to the impeller portion 432. This design further increases the flow rate of the shielded electric pump and improves its operating efficiency.

[0029] Preferably, see Figure 2 , Figure 5 and Figure 6The shielded electric pump of this invention also includes a first gasket 600. The pump body 100 is injection molded using a rotating shaft 500 and the first gasket 600 as inserts. Specifically, the rotating shaft 500 has a first flat section 530 on the side away from the pump cover 300. After the rotating shaft 500 is cut through the first flat section 530, a first flat section L1 is formed. The first gasket 600 has a first through hole 610 that matches the first flat section L1. During injection molding of the pump body 100, the first gasket 600 is first installed into the first flat section L1 through the first through hole 610, and then the assembled component is injection molded into the pump body 100 as an insert. After injection molding, the axial end face of the gasket 600 is exposed outside the pump body 100. This design avoids the first gasket 600 from rotating with the rotor assembly 400, which would cause wear and damage to the rotating shaft 500, thus improving the service life of the shielded electric pump. Furthermore, in this embodiment, the radial surface of the first flat segment L1 of the rotating shaft 500 is also recessed to form a second groove 540, which is enclosed within the pump body 100 after injection molding. This design increases the connection strength between the rotating shaft 500 and the pump body 100, reducing the risk of the rotating shaft 100 axially dislodging.

[0030] Preferably, see Figure 1 , Figure 4 and Figure 5 The canned motor pump of this invention also includes a second gasket 650. Specifically, the rotating shaft 500 is provided with a second flat section 550 near the pump cover 300. The rotating shaft 500 is cut through the second flat section 550 to form a second flat section L2. The second gasket 650 is provided with a second through hole (not shown) that matches the second flat section L2. During assembly, the second gasket 650 is installed on the second flat section L2 through the second through hole. After assembly, the second gasket 650 is located between the axial end face of the second flat section L2 and the axial end face of the shaft cap 320. This design prevents the second gasket 650 from rotating with the rotor assembly 400, thus avoiding damage to the rotating shaft 500 and improving the service life of the canned motor pump. Furthermore, the second flat section L2 of the rotating shaft 500 extends outward toward the axial end face of the pump cover 300 with a columnar mounting portion 560 whose outer diameter is smaller than that of the second flat section L2. This mounting portion 560 is inserted into the shaft cap 320. This design reduces the size of the shaft cap 320, lowers the resistance of the shaft cap 320 to the liquid entering from the inlet, and improves the working efficiency of the canned motor pump.

Claims

1. A shielded electric pump, comprising a pump body (100), a stator assembly (200) fixed on the pump body (100), a pump cover (300) covering the pump body (100), a rotor assembly (400) housed in a receiving cavity (10) formed by the pump body (100) and the pump cover (300), and a rotating shaft (500) axially fixed on one side of the pump body (100) and through which the rotor assembly (400) passes, wherein the pump cover (300) has a shaft cap (320) on the side axially facing the rotor assembly (400) for the rotating shaft (500) to be inserted and installed, characterized in that: The outer peripheral surface of the rotating shaft (500) located in the central through hole of the rotor assembly (400) is at least partially recessed to form a first groove (510). The outer peripheral surface of the rotating shaft (500) located in the central through hole of the rotor assembly (400) and distributed on both axial sides of the first groove (510) is also recessed to form several annular sealing grooves (520).

2. The screened electric pump according to claim 1, characterized in that: The radial gap between the rotating shaft (500) and the shaft cap (320) is provided with an elastic bushing (700).

3. The canned electric pump according to claim 1 or 2, characterized in that: It also includes a first gasket (600), the rotating shaft (500) is provided with a first flat part (530) on the side away from the pump cover (300) to form a first flat part segment L1, the first gasket (600) is provided with a first through hole (610) adapted to the first flat part segment L1, and it is installed on the first flat part segment L1 through the through hole (610), the pump body (100) is formed by injection molding with the rotating shaft (500) and the gasket (600) as inserts, and one axial end face of the gasket (600) is exposed outside the pump body (100).

4. The canned electric pump of claim 3, wherein: A portion of the surface of the first flat section L1 of the rotating shaft (500) is radially recessed to form a second groove (540), and the pump body (100) encloses the second groove (540).

5. The canned electric pump according to claim 1 or 2, characterized in that: It also includes a second gasket (650), wherein the rotating shaft (500) has a second flat section (550) forming a second flat section L2 on the side near the pump cover (300), and the second gasket (650) has a second through hole adapted to the second flat section L2, and is installed on the second flat section L2 through the second through hole.

6. The canned electric pump of claim 5, wherein: The second flat section L2 of the rotating shaft (500) has a columnar mounting part (560) with an outer diameter smaller than that of the second flat section L2 at one end facing the pump cover (300), and the mounting part (560) extends into the inner cavity of the shaft cap (320).

7. The canned electric pump according to claim 1 or 2, characterized in that: The rotor assembly (400) includes an annular magnetic core (410), a tubular bearing (420) located within the annulus of the magnetic core (410), and a mounting frame (430) injection molded with the magnetic core (410) and the bearing (420) as inserts. The mounting frame (430) includes a connecting portion (431) located radially between the magnetic core (410) and the bearing (420) and connecting the two, and an impeller portion (432) located on one axial side of the connecting portion (431).

8. The canned electric pump of claim 7, wherein: The rotor assembly (400) also includes an impeller cover (800) welded to the impeller portion (432).

Images