Energy storage shield pump motor structure

Abstract

This invention relates to a structure for an energy storage canned motor that not only ensures motor coaxiality but also provides good coaxiality for the shielding sleeve installation, while simultaneously offering low production costs, low manufacturing difficulty, and excellent heat dissipation. The permanent magnet motor has a front end cover with a front external stop and a rear end cover with a rear external stop. An annular gap exists between the motor stator and rotor. The rear end cover has an annular groove located between the rear bearing chamber and the rear external stop. The shielding sleeve comprises an annular clamping portion, a shielding sleeve portion, and a plug-in sleeve portion, all of which are integrally formed. One end of the shielding sleeve portion has the annular clamping portion, and the other end has the plug-in sleeve portion. Advantages: This energy storage canned pump motor structure not only ensures motor coaxiality but also provides good coaxiality for the shielding sleeve installation, while simultaneously offering low production costs, low manufacturing difficulty, and excellent heat dissipation.

Description

Technical Field

[0001] This invention belongs to the field of permanent magnet motor manufacturing technology, specifically relating to a structure for an energy storage shielded pump motor. Background Technology

[0002] Currently, the energy storage industry is a key development area for the country. With the rapid development of energy storage technology, higher requirements are being placed on the technical level of supporting products. For example, cooling pumps used in this industry require high power density, high efficiency, and leak-free characteristics. Permanent magnet shielded pumps are an excellent solution for this application. The most important aspect of high-level shielded pump technology is ensuring the coaxiality of the stator and rotor; only by ensuring coaxiality can the pump's performance level be guaranteed.

[0003] Design features and advantages: Currently, in existing permanent magnet motors, the stator shielding sleeve serves both as a shield and as a support for the bearings (i.e., providing support). For example, CN 223758131 U, entitled "A Shielding Sleeve for a Motor and a Motor Using the Same," includes a shielding sleeve made of plastic. The shielding sleeve comprises a central support section (1), a first support section (2) and a second support section (3) located at opposite ends of the central support section (1), and reinforcing members (4) on the first support section (2) and / or the second support section (3). The central support section (1) is used to pass through the inner cavity of the stator (5) of the motor, and the inner cavity of the central support section (1) is used to accommodate the rotor (6) of the motor. The reinforcing members (4) are used to enhance the support performance of the shielding sleeve. The reinforcing members (4) are made of stainless steel or carbon fiber. The reinforcing members (4) are several reinforcing rings. The reinforcing members (4) are either several independently spaced reinforcing rings or continuously spirally wound reinforcing rings. The reinforcing member (4) is a mesh reinforcing ring. The projection of the reinforcing member (4) on its cross-section is a circular ring or a radially concave-convex wavy ring. The reinforcing member (4) provided in the first support section (2) is completely embedded in the wall of the first support section (2), and the wall thickness of the reinforcing member (4) is less than the wall thickness of the first support section (2); or, the reinforcing member (4) provided in the first support section (2) is partially embedded in the wall of the first support section (2) and partially exposed on the periphery of the wall of the first support section (2). The reinforcing member (4) provided in the second support section (3) is completely embedded in the wall of the second support section (3), and the wall thickness of the reinforcing member (4) is less than the wall thickness of the second support section (3); or, the reinforcing member (4) provided in the second support section (3) is sleeved on the second support section (3). An electric motor includes a stator (5), a rotor (6), and a shielding sleeve disposed between the stator (5) and the rotor (6), wherein the shielding sleeve is a shielding sleeve for electric motors. A flange (7) is provided at the open end of the shielding sleeve, and a bearing seat (8) is provided at the bottom end of the shielding sleeve. Both the flange (7) and the bearing seat (8) are integrally formed with the shielding sleeve. An axially penetrating circulation through-hole (9) is provided on the bearing seat (8). Because the shielding sleeves in existing permanent magnet motors are made of thin steel plates, ensuring coaxiality is very difficult. Furthermore, the installation of bearings will cause stress, which may deform the shielding sleeve, making it even more difficult to guarantee coaxiality. Therefore, their shielding pumps have high production costs and large performance fluctuations. Summary of the Invention

[0004] Design objective: To avoid the shortcomings of the prior art, this paper designs a motor structure for an energy storage canned pump that not only ensures the coaxiality of the motor and the coaxiality of the shielding sleeve installation, but also has low motor production cost, low production difficulty, and good heat dissipation.

[0005] Design scheme: To achieve the above design objectives.

[0006] 1. The permanent magnet motor has a front inner stop at the front end of the base and a rear inner stop at the rear end. The center line of symmetry of the front inner stop coincides with the center line of symmetry of the rear inner stop. The front cover of the permanent magnet motor has a front outer stop and a front bearing chamber. The center line of symmetry of the front bearing chamber coincides with the center line of symmetry of the front outer stop. The rear cover of the permanent magnet motor has a rear outer stop and a rear bearing chamber. The center line of symmetry of the rear bearing chamber coincides with the center line of symmetry of the rear outer stop. An annular gap is provided between the motor stator and the motor rotor. The front inner stop is composed of a first inner stop segment and a second inner stop segment, with the first inner stop segment located outside the second inner stop segment. The rear cover has an annular recess. The annular groove is located between the rear bearing chamber and the rear outer stop. The shielding sleeve is composed of an annular clamping portion, a shielding sleeve portion, and a plug-in sleeve portion, and the annular clamping portion, the shielding sleeve portion, and the plug-in sleeve portion are integral structures. One end of the shielding sleeve portion is provided with an annular clamping portion, and the other end of the shielding sleeve portion is provided with a plug-in sleeve portion. The diameter of the annular clamping portion matches the diameter of the front outer stop, and the thickness of the annular clamping portion matches the depth of the second inner stop section. The thickness of the front outer stop matches the depth of the first inner stop section. The wall thickness of the plug-in sleeve portion matches the groove width of the annular groove. The design that the shielding sleeve portion is in the annular gap when the annular clamping portion of the shielding sleeve is clamped in the second inner stop section through the front end cover and the plug-in sleeve portion of the shielding sleeve and the annular groove form a plug-in fit is one of the technical features of this invention. The purpose of this design is as follows: the permanent magnet motor has a front inner stop at the front end of the base and a rear inner stop at the rear end. The center lines of symmetry of the front inner stop and the rear inner stop coincide. The front cover of the permanent magnet motor has a front outer stop and a front bearing chamber. The center line of symmetry of the front bearing chamber coincides with the center line of symmetry of the front outer stop. The rear cover of the permanent magnet motor has a rear outer stop and a rear bearing chamber. The center line of symmetry of the rear bearing chamber coincides with the center line of symmetry of the rear outer stop. An annular gap is provided between the stator and rotor of the permanent magnet motor. The front inner stop consists of a first inner stop segment and a second inner stop segment, with the first inner stop segment located outside the second inner stop segment. The rear cover has an annular groove located between the rear bearing chamber and the rear outer stop. The shielding sleeve consists of an annular clamping portion, a shielding sleeve portion, and a plug-in sleeve portion, and the annular clamping portion, shielding sleeve portion, and plug-in sleeve portion are integral structures. One end of the shielding sleeve is provided with an annular clamping portion, and the other end is provided with a plug-in sleeve portion. The diameter of the annular clamping portion matches the diameter of the front outer stop, and the thickness of the annular clamping portion matches the depth of the second inner stop section. The thickness of the front outer stop section matches the depth of the first inner stop section.The wall thickness of the plug-in sleeve matches the groove width of the annular groove. When the annular clamping portion of the shielding sleeve is clamped within the second inner stop section by the front end cover, and the plug-in sleeve portion and the annular groove form a plug-in fit, the shielding sleeve portion is located within the annular gap. In this structure, the independent shielding sleeve, after its annular clamping portion is positioned and installed with the second inner stop section, is precisely clamped by the front end cover; its plug-in sleeve portion plugs into the annular groove and is precisely supported by the rear end cover. In this way, not only is the shielding effect of the shielding sleeve ensured, but the assembly efficiency of the motor is also improved. At the same time, since the assembly of the shielding sleeve does not affect the stop fit between the front end cover and the frame, or the stop fit between the rear end cover and the frame, the coaxiality of the stator and rotor after motor assembly can be guaranteed. In addition, the matching design of the annular clamping portion and the second inner stop section in the front outer stop, as well as the plug-in fit design of the plug-in sleeve portion and the annular groove, ensure the coaxiality between the shielding sleeve and the stator and rotor, effectively avoiding the degradation of electromagnetic performance and operating vibration caused by assembly errors.

[0007] 2. The outer surface of the annular clamping portion is provided with a first annular groove and a first sealing ring is provided within the first annular groove. When the annular clamping portion of the shielding sleeve is clamped within the second inner stop section through the front end cover, the first sealing ring and the front end cover achieve sealed contact. The inner wall surface of the annular groove is provided with a second annular groove and a second sealing ring is provided within the second annular groove. When the insertion sleeve portion of the shielding sleeve and the annular groove form an insertion fit, the second sealing ring and the insertion sleeve portion achieve sealed contact. This design is the second technical feature of the present invention. The purpose of this design is that: the outer surface of the annular clamping portion is provided with a first annular groove and a first sealing ring is provided within the first annular groove. When the annular clamping portion of the shielding sleeve is clamped within the second inner stop section through the front end cover, the first sealing ring and the front end cover achieve sealed contact; the inner wall surface of the annular groove is provided with a second annular groove and a second sealing ring is provided within the second annular groove. When the insertion sleeve portion of the shielding sleeve and the annular groove form an insertion fit, the second sealing ring and the insertion sleeve portion achieve sealed contact. This design can effectively improve the sealing performance. The sealing contact between the first sealing ring and the front cover, and the sealing contact between the second sealing ring and the insertion sleeve, form a double sealing guarantee. This radial and axial double sealing structure not only prevents the intrusion of external media but also avoids the leakage of internal media, thereby ensuring the reliable operation of the motor under various operating conditions. At the same time, the sealing rings can also absorb minor deviations that occur during assembly to a certain extent, further improving the stability and precision of the assembly.

[0008] 3. The depth of the second inner stop section is greater than 1.2mm, the annular clamping plate is made of 1.2mm steel plate, the first annular groove is formed by stamping the body of the annular clamping plate and the groove depth plus the wall thickness of the first annular groove matches the depth of the second inner stop section; the shielding sleeve is made of 0.3mm steel plate; the groove width of the annular groove is greater than 1.2mm, the insertion sleeve is made of 1.2mm steel plate, and an annular plate is provided at the outer port of the insertion sleeve and the width of the annular plate matches the groove width of the annular groove. The design that the annular plate is made of 1.2mm steel plate is the third technical feature of this invention. The purpose of this design is as follows: the depth of the second inner stop section is greater than 1.2mm; the annular clamping plate is made of 1.2mm thick steel plate; the first annular groove is formed by stamping the body of the annular clamping plate, and the groove depth plus the wall thickness of the first annular groove matches the depth of the second inner stop section; the shielding sleeve is made of 0.3mm thick steel plate; the groove width of the annular groove is greater than 1.2mm; the insertion sleeve is made of 1.2mm thick steel plate; an annular plate is provided at the outer port of the insertion sleeve, and the width of the annular plate matches the groove width of the annular groove; the annular plate is made of 1.2mm thick steel plate. This design ensures a tight fit between the components during assembly, thereby improving the stability of the overall structure. By precisely controlling the dimensions and materials of each component, not only can the processing difficulty be reduced, but material waste during production can also be effectively reduced, thus lowering costs. Furthermore, using 1.2mm thick steel plates for the annular clamping plate and the insertion sleeve, and 0.3mm thick steel plates for the shielding sleeve, reduces overall weight while ensuring strength, resulting in a more compact and easier-to-install motor structure. The thin-walled design of the shielding sleeve significantly reduces energy loss due to eddy currents, further improving the overall motor performance. Simultaneously, it allows for significant optimization of the annular gap design (e.g., reducing air gap electromagnetic design). Moreover, the matching design between the annular plate and the annular groove enhances the positioning accuracy of the insertion sleeve during assembly and provides additional support during operation, reducing the risk of structural loosening due to vibration or external impact. This design ensures that the shielding sleeve achieves efficient shielding while also possessing good mechanical strength and stability, guaranteeing long-term reliable motor operation.

[0009] 4. The front end cover has multiple through holes on its front side, and these through holes penetrate both sides of the front end cover; a gap is left between the shielding sleeve and the motor rotor; the inner diameter ring of the rear bearing in the permanent magnet motor has multiple inner grooves; and the front end face of the rotor shaft in the permanent magnet motor has a rotor shaft through hole that penetrates both the front and rear ends of the rotor shaft. This design is the fourth technical feature of the present invention. The purpose of this design is that: the front end cover has multiple through holes on its front side, and these through holes penetrate both sides of the front end cover; a gap is left between the shielding sleeve and the motor rotor; the inner diameter ring of the rear bearing in the permanent magnet motor has multiple inner grooves; and the front end face of the rotor shaft in the permanent magnet motor has a rotor shaft through hole that penetrates both the front and rear ends of the rotor shaft. External coolant enters the inner cavity of the shielding sleeve through the multiple through holes on the front end cover. The delivery fluid flows through the gap between the shielding sleeve and the motor rotor (the outer surface of the motor rotor is provided with a sealing cover, which is made of 304 stainless steel) and enters the cavity formed by the rear end cover and the shielding sleeve. Subsequently, the coolant flows through multiple internal grooves on the inner diameter ring of the rear bearing into the rear port of the rotor shaft through hole, and finally flows out from the front port of the rotor shaft through hole. This process can remove the heat generated by motor losses, thereby effectively reducing the temperature rise of the motor and improving the stability and reliability of motor operation.

[0010] 5. The design of encapsulating the motor winding cavity in the permanent magnet motor with epoxy resin is the fifth technical feature of this invention. The purpose of this design is that encapsulating the motor winding cavity with epoxy resin effectively prevents condensation inside the winding, thereby avoiding electrical faults caused by condensation and further improving the motor's adaptability to harsh environments. The epoxy resin encapsulation also enhances the overall integrity of the winding structure, reduces the risk of loosening due to vibration or impact, and extends the motor's service life. Furthermore, epoxy resin has excellent thermal conductivity, which can quickly conduct the heat generated during winding operation to the housing surface for effective heat dissipation through the external cooling system, thereby reducing motor temperature rise and improving operating efficiency. Simultaneously, the application of the encapsulation process simplifies the winding manufacturing process, reduces the uncertainty caused by manual intervention, and provides technical support for achieving large-scale production. This design not only meets the stringent requirements of high-performance motors for insulation and heat dissipation, but also takes into account production efficiency and cost control, reflecting the unity of technical practicality and economy; in addition, the epoxy resin adhesive also provides support and protection for the shielding sleeve, enabling the shielding sleeve to withstand 0.5 MPa pressure.

[0011] 6. The design of having a third annular groove on the rear end face of the base, with a third sealing ring inside the groove, so that the third sealing ring and the rear end cover achieve a sealing contact when assembled, is the sixth technical feature of this invention. The purpose of this design is that the third annular groove on the rear end face of the base, with a third sealing ring inside, allows for a sealing contact between the third sealing ring and the rear end cover when assembled, thus further improving the sealing effect of the energy storage shielded pump motor structure.

[0012] Technical Solution: A structure for a shielded pump motor for energy storage includes a permanent magnet motor and a shielding sleeve. The permanent magnet motor has a front inner stop at its front end and a rear inner stop at its rear end, with the center line of symmetry of the front inner stop coinciding with the center line of symmetry of the rear inner stop. The permanent magnet motor also has a front outer stop on its front end cover and a front bearing chamber on the front end cover, with the center line of symmetry of the front bearing chamber coinciding with the center line of symmetry of the front outer stop. Similarly, the permanent magnet motor has a rear outer stop on its rear end cover and a rear bearing chamber on the rear end cover, with the center line of symmetry of the rear bearing chamber coinciding with the center line of symmetry of the rear outer stop. An annular gap is provided between the motor stator and the motor rotor in the permanent magnet motor. The front inner stop is composed of a first inner stop segment and a second inner stop segment, with the first inner stop segment located at... On the outer side of the second inner stop section, the rear end cover is provided with an annular groove, which is located between the rear end bearing chamber and the rear end outer stop. The shielding sleeve is composed of an annular clamping portion, a shielding sleeve portion, and a plug-in sleeve portion, and the annular clamping portion, the shielding sleeve portion, and the plug-in sleeve portion are integral structures. One end of the shielding sleeve portion is provided with an annular clamping portion, and the other end of the shielding sleeve portion is provided with a plug-in sleeve portion. The diameter of the annular clamping portion matches the diameter of the front end outer stop, and the thickness of the annular clamping portion matches the depth of the second inner stop section. The thickness of the front end outer stop matches the depth of the first inner stop section. The wall thickness of the plug-in sleeve portion matches the groove width of the annular groove. When the annular clamping portion of the shielding sleeve is clamped in the second inner stop section through the front end cover and the plug-in sleeve portion of the shielding sleeve and the annular groove form a plug-in fit, the shielding sleeve portion is in the annular gap.

[0013] Compared with the prior art, the present invention provides an energy storage shielded pump motor structure that not only ensures motor coaxiality but also has good coaxiality of shielding sleeve installation. At the same time, the motor has low production cost and low production difficulty, and also has good heat dissipation effect. Attached Figure Description

[0014] Figure 1 This is a cross-sectional structural diagram of an energy storage shielded pump motor.

[0015] Figure 2 This is a schematic diagram of the three-dimensional structure of the shielding sleeve. Figure One .

[0016] Figure 3 This is a schematic diagram of the three-dimensional structure of the shielding sleeve. Figure Two .

[0017] Figure 4 This is a picture of the actual shielding sleeve.

[0018] Figure 5 This is a flowchart of the physical assembly of a canned motor structure for an energy storage pump. Detailed Implementation

[0019] Example 1: Refer to Appendix Figures 1-5 A structure for an energy storage shielded pump motor includes a permanent magnet motor 1 and a shielding sleeve 2. The permanent magnet motor 1 has a front inner stop 111 at its front end and a rear inner stop 112 at its rear end. The center line of symmetry of the front inner stop 111 coincides with the center line of symmetry of the rear inner stop 112. The front cover 12 of the permanent magnet motor 1 has a front outer stop 121 and a front bearing chamber 122. The center line of symmetry of the front bearing chamber 122 coincides with the center line of symmetry of the front outer stop 121. The symmetrical center lines of the two components coincide. The rear end cover 13 of the permanent magnet motor 1 is provided with a rear end outer stop 131 and a rear end bearing chamber 132. The symmetrical center line of the rear end bearing chamber 132 coincides with the symmetrical center line of the rear end outer stop 131. An annular gap is provided between the motor stator 14 and the motor rotor 15 in the permanent magnet motor 1. The front end inner stop 111 is composed of a first inner stop segment 1111 and a second inner stop segment 1112, and the first inner stop segment 1111 is located at the second inner stop segment. On the outer side of 1112, the rear end cover 13 is provided with an annular groove 133, which is located between the rear end bearing chamber 132 and the rear end outer stop 131. The shielding sleeve 2 is composed of an annular clamping portion 21, a shielding sleeve portion 22, and a plug-in sleeve portion 23, and the annular clamping portion 21, the shielding sleeve portion 22, and the plug-in sleeve portion 23 are integral structures. One end of the shielding sleeve portion 22 is provided with the annular clamping portion 21, and the other end of the shielding sleeve portion 22 is provided with the plug-in sleeve portion 23. The diameter of the annular clamping portion 21 is the same as that of the front end outer stop. The diameter of 121 matches and the thickness of the annular clamp portion 21 matches the depth of the second inner stop section 1112. The thickness of the front outer stop 121 matches the depth of the first inner stop section 1111. The wall thickness of the plug sleeve portion 23 matches the groove width of the annular groove 133. When the annular clamp portion 21 of the shielding sleeve 2 is clamped in the second inner stop section 1112 through the front end cover 12 and the plug sleeve portion 23 of the shielding sleeve 2 and the annular groove 133 form a plug-in fit, the shielding sleeve portion 22 is in the annular gap.

[0020] Preferably, the outer surface of the annular clamping portion 21 is provided with a first annular groove 24 and a first sealing ring 3 is provided in the first annular groove 24. When the annular clamping portion 21 of the shielding sleeve 2 is clamped in the second inner stop section 1112 through the front end cover 12, the first sealing ring 3 and the front end cover 12 achieve sealed contact. The inner wall surface of the annular groove 133 is provided with a second annular groove 1331 and a second sealing ring 8 is provided in the second annular groove 1331. When the insertion sleeve portion 23 of the shielding sleeve 2 and the annular groove 133 form an insertion fit, the second sealing ring 8 and the insertion sleeve portion 23 achieve sealed contact.

[0021] Preferably, the depth of the second inner stop section 1112 is greater than 1.2 mm, the annular clamping plate 21 is made of 1.2 mm thick steel plate, the first annular groove 24 is formed by stamping the body of the annular clamping plate 21, and the groove depth plus the wall thickness of the first annular groove 24 matches the depth of the second inner stop section 1112; the shielding sleeve 22 is made of 0.3 mm thick steel plate; the groove width of the annular groove 133 is greater than 1.2 mm, the insertion sleeve 23 is made of 1.2 mm thick steel plate, and an annular plate 25 is provided at the outer port of the insertion sleeve 23, the width of the annular plate 25 matching the groove width of the annular groove 133, and the annular plate 25 is made of 1.2 mm thick steel plate. Preferably, the steel plate is made of 304 stainless steel.

[0022] Preferably, the front end cover 12 has multiple through holes 123 on its front side, and these through holes 123 penetrate both sides of the front end cover 12. A gap is left between the shielding sleeve 2 and the motor rotor 15. The inner diameter ring of the rear bearing 5 in the permanent magnet motor 1 has multiple inner grooves. The front end face of the rotor shaft 151 in the permanent magnet motor 1 has a rotor shaft through hole 1511, which penetrates both the front and rear end faces of the rotor shaft 151. External coolant enters the inner cavity of the shielding sleeve through the multiple through holes on the front end cover. The coolant flows through the gap between the shielding sleeve and the motor rotor (the outer surface of the motor rotor is provided with a sealing cover made of 304 stainless steel) and enters the cavity formed by the rear end cover and the shielding sleeve. Subsequently, the coolant flows through the multiple inner grooves on the inner diameter ring of the rear bearing into the rear port of the rotor shaft through hole, and finally flows out from the front port of the rotor shaft through hole.

[0023] Preferably, the motor winding cavity of the permanent magnet motor 1 is filled with epoxy resin adhesive 6. Preferably, a front bearing 4 is provided in the front bearing chamber 122, a rear bearing 5 is provided in the rear bearing chamber 132, and a rotor shaft 151 is provided between the front bearing 4 and the rear bearing 5. Preferably, a third annular groove 113 is provided on the rear end face of the base 11, and a third sealing ring 7 is provided in the third annular groove 113. When the rear end cover 13 is assembled with the base 11, the third sealing ring 7 and the rear end cover 13 achieve sealed contact.

[0024] An assembly process for a canned motor structure for an energy storage pump: First, the motor stator is installed on the base. Then, the canned sleeve is inserted into the inner hole of the motor stator, with the outer circular surface of the canned sleeve in the canned sleeve making surface-to-surface contact with the inner hole surface of the motor stator. At this time, the annular clamping plate is assembled in the second inner stop section. Then, the first sealing ring is placed in the first annular groove. Then, the front end cover is positioned and installed (stop installation) at the front end of the base, and the front end cover presses down on the annular clamping plate of the canned sleeve. Then, the motor rotor is inserted. Then, the rear end cover with the second sealing ring is positioned and installed (stop installation) at the rear end of the base. At the same time, the insertion sleeve of the canned sleeve and the annular groove form an insertion fit. At this time, the rear end cover supports the rear end of the canned sleeve.

[0025] The shielding effect was evaluated based on the test report from the China National Accreditation Service for Conformity Assessment (CNAS). The shielding structure was assessed using the test items in the report and was found to meet the requirements for long-term safe operation under a pressure of 0.5 MPa. Combined with the structural characteristics of this water pump, this shielding structure eliminates the risk of dynamic seal leakage, achieving a truly leak-free operating scenario.

[0026] It should be understood that although the above embodiments provide a relatively detailed textual description of the design concept of the present invention, these textual descriptions are merely simple textual descriptions of the design concept of the present invention, and not limitations on the design concept of the present invention. Any combination, addition, or modification that does not exceed the design concept of the present invention falls within the protection scope of the present invention.

Claims

1. A structure for a canned motor of an energy storage pump, comprising a permanent magnet motor (1) and a shielding sleeve (2), wherein the front end of the base (11) of the permanent magnet motor (1) is provided with a front end inner stop (111) and the rear end of the base (11) is provided with a rear end inner stop (112), the symmetrical center line of the front end inner stop (111) coincides with the symmetrical center line of the rear end inner stop (112), the front end cover (12) of the permanent magnet motor (1) is provided with a front end outer stop (121) and the front end cover (12) is provided with a front end bearing chamber (12). 2) The symmetrical center line of the front bearing chamber (122) coincides with the symmetrical center line of the front outer stop (121). The rear end cover (13) of the permanent magnet motor (1) is provided with a rear outer stop (131) and a rear end bearing chamber (132). The symmetrical center line of the rear end bearing chamber (132) coincides with the symmetrical center line of the rear outer stop (131). An annular gap is provided between the motor stator (14) and the motor rotor (15) of the permanent magnet motor (1). Its characteristics are: The front inner stop (111) is composed of a first inner stop section (1111) and a second inner stop section (1112), with the first inner stop section (1111) located outside the second inner stop section (1112). The rear end cover (13) is provided with an annular groove (133), which is located between the rear end bearing chamber (132) and the rear end outer stop (131). The shielding sleeve (2) is composed of an annular clamping portion (21), a shielding sleeve portion (22), and a plug-in sleeve portion (23), which are integrally formed. One end of the shielding sleeve portion (22) is provided with an annular clamping portion (21), and the shielding sleeve portion (22) is... The other end is provided with a plug-in sleeve (23). The diameter of the annular clamp (21) matches the diameter of the front outer stop (121), and the thickness of the annular clamp (21) matches the depth of the second inner stop section (1112). The thickness of the front outer stop (121) matches the depth of the first inner stop section (1111). The wall thickness of the plug-in sleeve (23) matches the groove width of the annular groove (133). When the annular clamp (21) of the shielding sleeve (2) is clamped in the second inner stop section (1112) through the front end cover (12) and the plug-in sleeve (23) of the shielding sleeve (2) and the annular groove (133) form a plug-in fit, the shielding sleeve (22) is in the annular gap.

2. The energy storage shielded pump motor structure according to claim 1, characterized in that: The outer side of the annular clamping plate (21) is provided with a first annular groove (24) and a first sealing ring (3) is provided in the first annular groove (24). When the annular clamping plate (21) of the shielding sleeve (2) is clamped in the second inner stop section (1112) through the front end cover (12), the first sealing ring (3) and the front end cover (12) achieve sealed contact. The inner wall of the annular groove (133) is provided with a second annular groove (1331) and a second sealing ring (8) is provided in the second annular groove (1331). When the plug-in sleeve (23) of the shielding sleeve (2) and the annular groove (133) form a plug-in fit, the second sealing ring (8) and the plug-in sleeve (23) achieve sealed contact.

3. The energy storage shielded pump motor structure according to claim 2, characterized in that: The second inner stop section (1112) has a depth greater than 1.2 mm. The annular clamping plate (21) is made of 1.2 mm steel plate. The first annular groove (24) is formed by stamping the body of the annular clamping plate (21), and the groove depth of the first annular groove (24) plus the wall thickness of the first annular groove (24) matches the depth of the second inner stop section (1112). The shielding sleeve (22) is made of 0.3 mm steel plate. The groove width of the annular groove (133) is greater than 1.2 mm. The plug-in sleeve (23) is made of 1.2 mm steel plate. The outer port of the plug-in sleeve (23) is provided with an annular plate (25), and the width of the annular plate (25) matches the groove width of the annular groove (133). The annular plate (25) is made of 1.2 mm steel plate.

4. The energy storage shielded pump motor structure according to claim 3, characterized in that: The steel plate is made of 304 stainless steel.

5. The energy storage shielded pump motor structure according to claim 2, characterized in that: The front end cover (12) has multiple through holes (123) on its front side, and the multiple through holes (123) penetrate both sides of the front end cover (12); there is a gap between the shielding sleeve (2) and the motor rotor (15); the inner diameter ring of the rear bearing (5) in the permanent magnet motor (1) has multiple inner hole grooves; the front end face of the rotor shaft (151) in the permanent magnet motor (1) has a rotor shaft through hole (1511), and the rotor shaft through hole (1511) penetrates both the front and rear end faces of the rotor shaft (151).

6. The energy storage shielded pump motor structure according to claim 1, characterized in that: The motor winding cavity of the permanent magnet motor (1) is filled with epoxy resin glue (6).

7. The energy storage shielded pump motor structure according to claim 1, characterized in that: The front bearing chamber (122) is provided with a front bearing (4), the rear bearing chamber (132) is provided with a rear bearing (5), and a rotor shaft (151) is provided between the front bearing (4) and the rear bearing (5).

8. The energy storage shielded pump motor structure according to claim 1, characterized in that: The rear end face of the base (11) is provided with a third annular groove (113) and a third sealing ring (7) is provided in the third annular groove (113). When the rear end cover (13) is assembled with the base (11), the third sealing ring (7) and the rear end cover (13) achieve sealed contact.

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