Cantilever type magnetic drive pump

Abstract

The utility model provides a cantilever type magnetic drive pump, and belongs to the technical field of pumps. The technical problem that an existing cantilever type magnetic drive pump is not good enough in sealing effect is solved. A cantilever type magnetic drive pump comprises a pump shell and a motor shell, a stator assembly is fixedly installed between the pump shell and the motor shell, a rotor assembly rotating relatively is embedded in the stator assembly, an impeller is fixedly connected to the rotor assembly, the stator assembly comprises a stator shielding sleeve and a stator assembly wrapped by the stator shielding sleeve, and a concave cavity is formed in the middle of the stator shielding sleeve. The bottom of the concave cavity protrudes towards the impeller to form an installation column, a reinforcing piece is arranged in the installation column, the rotor assembly is embedded into the concave cavity and fixedly and rotatably arranged outside the installation column in a sleeving mode, the installation column penetrates through the middle of the rotor assembly, and the impeller is fixedly connected to the rotor assembly. The sealing device is good in sealing effect and stable in rotation.

Description

Technical Field

[0001] The utility model belongs to the technical field of pumps, in particular to a cantilever magnetic pump. Background Art

[0002] The sealless magnetic drive pump is acid and alkali resistant, corrosion resistant, easy to assemble, and has high durability. It is used in many production processes that are corrosion-resistant or do not allow leakage. The sealless magnetic drive pump made of engineering plastic material is further combined with a permanent magnet motor to replace the traditional induction motor, which increases the application range of the pump, makes it easier to adjust the flow rate and head, and has a smaller size. It can better meet the wider needs of users in the production process.

[0003] The sealless magnetic drive pump adopts two types of structural design: a fixed shaft and a rotating shaft. The support methods of the fixed shaft include two-end support and cantilever support. In the prior art, such as a magnetic drive pump in Chinese Patent 2011103448035, the fixed shaft support method of the invention is two-end support. The fixed shaft generally adopts a ceramic shaft with good corrosion resistance. Since the strength of the ceramic shaft itself is not enough, the axial inner extension member located at the inner diameter of the pump inlet and the bottom of the rear cover are generally used to provide auxiliary support at both ends of the fixed shaft, providing the main support strength for the fixed shaft. Due to the small size of the pump, the flow loss at the inlet will increase after the extension member is set at the inlet. How to cancel the extension member at the pump inlet? If a cantilever fixed shaft is used, the strength of the ceramic shaft is not enough, so a high-rigidity composite fixed shaft is used.

[0004] For example, the permanent magnet canned pump of Chinese patent 2009101361538 has been improved for the support structure of the rotor system, and various requirements for supporting the rotor system are met by providing a high-rigidity cantilever fixed shaft structure, wherein the characteristics of the high-rigidity cantilever fixed shaft structure include: a high-rigidity metal shaft, which is fixed to the motor rear frame and forms a fixed shaft with a ceramic sleeve, a ceramic sleeve, which is used to form a fixed shaft in combination with the metal shaft to support the rotation and axial thrust of the motor rotor, a motor rear frame, which is used to fix the metal shaft to strengthen the support strength of the fixed shaft, and cooperate with the sealing rear cover to provide the motor coil sealing function, and a sealing rear cover, which has a middle opening to allow the metal shaft to pass through, and its internal space is used to accommodate the motor rotor and provide the motor stator coil sealing function. The circular head at one end of the metal shaft is pressed tightly against the front end face of the ceramic sleeve, and the other end of the metal shaft with a screw thread passes through the motor rear frame hole and is locked in the motor rear frame, and the circular head of the metal shaft is plastic coated, and an O-ring is provided on it to achieve the sealing and corrosion-resistant function. The plastic package sealed by the O-ring may cause leakage after a long period of use, the metal shaft is easily corroded, and because the metal shaft is relatively slender, it may shake or even break during rotation. Summary of the invention

[0005] In view of the shortcomings of the prior art, the purpose of the utility model is to provide a cantilever magnetic pump. The technical problem to be solved by the utility model is: how to make the cantilever magnetic pump more sealed and how to better fix the rotor assembly and the impeller in the cantilever magnetic pump for stable rotation.

[0006] The purpose of the utility model can be achieved through the following technical solutions: a cantilever magnetic pump, comprising a pump casing and a motor casing that are detachably fixedly connected, a stator assembly is fixedly installed between the pump casing and the motor casing, a relatively rotating rotor assembly is embedded in the stator assembly, an impeller is fixedly connected to the rotor assembly, the stator assembly comprises a stator shielding sleeve and a stator assembly wrapped by the stator shielding sleeve, the stator shielding sleeve has a concave cavity in the middle, a mounting column protrudes from the bottom of the concave cavity toward the impeller, a reinforcement is arranged in the mounting column, the rotor assembly is embedded in the concave cavity and a fixed rotating sleeve is arranged outside the mounting column, the mounting column passes through the middle of the rotor assembly, and the impeller is fixedly connected to the rotor assembly.

[0007] The stator assembly and the pump housing together form a pump cavity, and the stator assembly and the motor housing together form a motor cavity. The pump cavity and the motor cavity are independent of each other and not connected. The concave cavity opens to the pump cavity, and the rotor assembly, impeller and mounting column are completely immersed in the medium of the pump cavity. The mounting column and the stator shielding sleeve are integrally formed, and the material is a plastic material with good corrosion resistance. The mounting column is wrapped with a reinforcement, and the reinforcement is sealed inside by the integrally formed mounting column to prevent contact with external corrosive substances, and can make the mounting column have better strength to support the rotation of the rotor assembly. The rotor assembly is embedded in the groove and sleeved on the outside of the mounting column. The lower end of the mounting column is fixed and the upper end is suspended to form a cantilever structure. The mounting column runs through the middle of the rotor assembly to better support the fixed rotor assembly and the rotation of the impeller.

[0008] Furthermore, the stator shielding sleeve comprises a shielding upper sleeve and a shielding lower sleeve which are detachably fixedly connected, the mounting post is located in the middle of the shielding upper sleeve, the bottom of the mounting post is provided with a fixing hole 1 whose opening faces the shielding lower sleeve, the shielding lower sleeve has a fixing hole 2 which is opposite to the fixing hole 1 and passes through from top to bottom, and the reinforcement is fixed in the fixing hole 1 and the fixing hole 2.

[0009] The reinforcement is wrapped by the first fixing hole and the second fixing hole to be isolated from the pump cavity. The reinforcement can also fix the shielding upper sleeve and the shielding lower sleeve and strengthen the support for the rotation of the rotor assembly.

[0010] Furthermore, the shielding upper sleeve is provided with a stepped hole near the mounting column, the fixing hole one is connected to the stepped hole, the shielding lower sleeve is protruding with a stepped boss which cooperates with the stepped hole and is fixed, the upper part of the stepped boss is embedded in the fixing hole one, the fixing hole two is arranged in the stepped boss, a fixing cylinder is protruding from the middle of the bottom of the fixing hole one toward the shielding lower sleeve, the fixing cylinder is embedded in the upper part of the fixing hole two, a fixing ring is protruding inward on the inner circumference of the fixing hole two, the reinforcement is stepped, and the reinforcement passes through the fixing hole two and is threadedly fixed to the fixing cylinder.

[0011] The setting of the stepped hole reduces the stress concentration to a certain extent, and a stepped boss is provided on the shielding lower sleeve in conjunction with the stepped fixing hole 1 to strengthen the bottom strength of the entire stator shielding sleeve. The upper part of the stepped boss is embedded in the fixing hole 1 to strengthen the strength of the mounting column. The reinforcement passes through the fixing hole 2 and is fixed to the fixing cylindrical thread, so that the mounting column is stable and has sufficient strength to support the rotation of the rotor assembly.

[0012] Furthermore, a metal plate is embedded in the shielding lower sleeve, the metal plate has a central through hole, and the reinforcement passes through the second fixing hole and the central through hole of the metal plate and is embedded in the first fixing hole.

[0013] The metal plate enhances the strength of the shielding lower sleeve, and the reinforcement member passes through the metal plate and the mounting column to be embedded and fixed to each other. The metal plate provides a lateral support for the reinforcement member so that the reinforcement member and the mounting column have better lateral support, making the rotor assembly and the impeller rotate more stably.

[0014] Furthermore, the metal plate has a plurality of fixing through holes and threaded holes evenly distributed around the central through hole, the metal plate and the shielding lower sleeve are integrally formed, the shielding lower sleeve after forming has a fixing block filled with the fixing through holes, the shielding lower sleeve after forming also has a shoulder block for limiting the axial movement of the metal plate, and a fixing part is also provided at the lower part of the shielding lower sleeve, the fixing part covers the bottom of the reinforcement and is fixed to the threaded hole through a threaded part.

[0015] By fixing the fixed through hole and the fixed block to each other and axially limiting the shoulder block, the metal plate is firmly fixed to the shielding lower sleeve to form an integrated part. After the shielding lower sleeve and the shielding upper sleeve are fixedly connected, the metal plate is wrapped inside and does not contact the medium in the pump chamber. The metal plate and the reinforcement are both in a sealed environment. The strength of the metal plate cooperates with the reinforcement and the mounting column to form a more stable cantilever rotor assembly mounting structure, so that the mounting column can better support the stable rotation of the rotor assembly.

[0016] Furthermore, a silicon carbide sleeve is fixed to the inner circumference of the rotor assembly, a ceramic sleeve is fixed to the outer circumference of the mounting column, the outer circumferential surface of the ceramic sleeve is slidably matched with the inner circumferential surface of the silicon carbide sleeve, a thrust plate is fixed to the bottom of the concave cavity, the upper end surface of the thrust plate abuts against the silicon carbide sleeve and does not contact the rotor assembly, the lower end surface of the silicon carbide sleeve is slidably matched with the upper end surface of the thrust plate, a flow channel groove 1 is provided on the inner circumferential surface of the silicon carbide sleeve, and a flow channel groove 2 is provided on the upper end surface of the thrust plate.

[0017] A ceramic sleeve and a silicon carbide sleeve with a small gap are used as sliding and rotating parts between the rotor assembly and the mounting column, which reduces the radial shaking of the cantilever rotor assembly mounting structure and better supports the rotation of the rotor assembly and the impeller.

[0018] Furthermore, a plurality of positioning blocks protrude from the bottom of the cavity toward the cavity, and the positioning blocks are evenly distributed around the mounting column. A fixing groove cooperating with the positioning blocks is provided at the lower part of the ceramic sleeve, and a fixing portion that can limit the axial movement of the ceramic sleeve protrudes radially from the upper end of the mounting column.

[0019] The fixation of the positioning block and the positioning groove limits the circumferential rotation of the ceramic sleeve and the fixing portion limits its axial movement, so that the ceramic sleeve better supports the silicon carbide sleeve and the sliding rotation and thus better supports the rotation of the rotor assembly.

[0020] Furthermore, the upper end of the rotor assembly has a neck portion that is retracted inward, and a block is protruding outward from the side wall of the neck portion, and a spring plate is protruding downward from the lower end of the impeller, and a hole that cooperates with the block is provided on the spring plate, and a plurality of protrusions are also formed on the side wall of the neck portion, and the protrusions and the block are arranged at intervals from each other. A plurality of fixing plates are protruding from the lower part of the impeller toward the rotor assembly, and the fixing plates are independently suspended relative to the spring plate, and a groove that cooperates with the protrusions is provided on the fixing plate, and a supporting ring plate opposite to the neck portion protrudes upward from the outer circumference of the rotor assembly, and the spring plate and the fixing plate are both located between the supporting ring plate and the neck portion.

[0021] This solution better fixes the impeller and rotor assembly, and cooperates with the sliding rotation of the above-mentioned ceramic sleeve and silicon carbide sleeve, and the support ring plate further supports the impeller, together forming a stable impeller and rotor assembly fixed rotation structure, so that the rotor assembly and impeller are better fixed and stably rotated in the cantilever magnetic pump.

[0022] Furthermore, a coaxial ring plate 1 and a ring plate 2 protrude upward from the upper end of the rotor assembly, the ring plate 1 is located on the outer side of the ring plate 2, a plurality of clamping holes 2 are arranged on the ring plate 1, and a clamping block 2 protruding toward the ring plate 2 is also arranged on the ring plate 1, and the clamping hole 2 and the clamping block 2 are arranged at intervals from each other, a ring plate 3 protrudes from the lower end of the impeller, the ring plate 3 is located between the ring plate 1 and the ring plate 2, a plurality of long strips protrude from the outer circumference of the ring plate 3 toward the ring plate 1, and the long strips are tightly matched with the ring plate 1, and a plurality of spring plates 2 are also protruded from the lower end of the impeller, the spring plates 2 are not in contact with the ring plate 3, and the lower end of the spring plate 2 has a barb portion, and the barb portion is fixedly matched with the clamping hole 2.

[0023] This solution enables the impeller and the rotor assembly to be better supported and fixed, so that the rotor assembly and the impeller are better fixed and can rotate stably in the cantilever magnetic pump.

[0024] Furthermore, a heat dissipation shell is provided at the lower part of the motor shell, the heat dissipation shell is fixed to the stator shielding sleeve, and a frequency conversion assembly is fixedly provided on the heat dissipation shell.

[0025] Compared with the prior art, the technical effects of the utility model are as follows: 1. By integrally molding the mounting column and the stator shielding sleeve, a closed space is formed for installing the reinforcement, and the sealing effect of the reinforcement is better. The reinforcement can better help the mounting column to support the rotation of the rotor assembly. The setting of the stepped hole reduces the stress concentration to a certain extent, and a stepped boss is provided on the shielding lower sleeve in conjunction with the stepped fixing hole 1 to enhance the bottom strength of the entire stator shielding sleeve. The upper part of the stepped boss is embedded in the fixing hole 1 to enhance the strength of the mounting column. The reinforcement passes through the fixing hole 2 and is fixed to the fixing cylinder thread, so that the mounting column is stable and has sufficient strength to support the rotation of the rotor assembly.

[0026] Second, by integrally molding the mounting column and the stator shielding sleeve, a closed space is formed for installing the reinforcement, the reinforcement has a better sealing effect, and the reinforcement can better help the mounting column to support the rotation of the rotor assembly. The metal plate is arranged to enhance the strength of the lower shielding sleeve, and the reinforcement passes through the metal plate and the mounting column to be embedded and fixed to each other. The metal plate provides a lateral support for the reinforcement, so that the reinforcement and the mounting column have better lateral support, making the rotation of the rotor assembly and the impeller more stable.

[0027] 3. Enhance the stability of impeller rotation by different fixing methods of impeller and rotor assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a cross-sectional view of the utility model.

[0029] Figure 2 It is an exploded view of the silicon carbide sleeve, ceramic sleeve and thrust plate of the utility model.

[0030] Figure 3 It is a half-section stereoscopic view of the stator assembly of the utility model.

[0031] Figure 4 It is a cross-sectional view of the stator assembly of the utility model.

[0032] Figure 5 The utility model is a three-dimensional impeller Figure 1 .

[0033] Figure 6 The utility model is a three-dimensional rotor assembly Figure 1 .

[0034] Figure 7 The utility model is a three-dimensional impeller Figure 2 .

[0035] Figure 8 The utility model is a three-dimensional rotor assembly Figure 2 .

[0036] Figure number marking: 1, pump housing; 2, motor housing; 3, impeller; 301, spring plate 1; 302, clamping hole 1; 303, fixing plate; 304, clamping groove; 305, ring plate 3; 306, long strip; 307, spring plate 2; 308, barb; 4, stator shielding sleeve; 41, shielding upper sleeve; 42, shielding lower sleeve; 401, concave cavity; 402, mounting column; 403, fixing hole 1; 404, fixing hole 2; 405, stepped hole; 406, stepped boss; 407, fixed cylinder; 408, fixed ring; 409, fixed block; 410, shoulder block; 4 11. Positioning block; 412. Fixing part; 5. Stator assembly; 6. Reinforcement member; 7. Rotor assembly; 701. Neck contraction; 702. Block 1; 703. Bump; 704. Support ring plate; 705. Ring plate 1; 706. Ring plate 2; 707. Clamping hole 2; 708. Block 2; 8. Metal plate; 801. Middle through hole; 802. Fixed through hole; 803. Threaded hole; 9. Fixing member; 10. Silicon carbide sleeve; 1001. Flow channel groove 1; 11. Ceramic sleeve; 1101. Fixed groove; 12. Thrust plate; 1201. Flow channel groove 2; 13. Heat sink. DETAILED DESCRIPTION

[0037] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0038] It should be noted that the descriptions of the present invention regarding directions such as "up", "down", "left", "right", "top" and "bottom" are all defined based on the relationships between the orientations or positions shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device must be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0039] according to Figures 1 to 8 As shown, a cantilever magnetic pump comprises a pump housing 1 and a motor housing 2 which are detachably fixedly connected, the pump housing 1 having an inlet and an outlet, a stator assembly fixedly installed between the pump housing 1 and the motor housing 2, and the pump housing 1, the motor housing 2 and the stator assembly can be fixed by bolts or the like. The stator assembly and the pump housing 1 together form a pump chamber, the stator assembly and the motor housing 2 together form a motor chamber, and the pump chamber and the motor chamber are independent of each other and not connected. The pump chamber has an impeller 3, and the motor chamber has a frequency conversion assembly. A heat dissipation shell 13 is provided at the lower part of the motor housing 2, and a frequency conversion assembly is fixedly provided on the heat dissipation shell 13. The frequency conversion assembly plays a frequency conversion role. The rotor assembly 7 comprises a rotor shielding sleeve and a rotor assembly wrapped by the rotor shielding sleeve, the rotor assembly generally comprises a rotor yoke and a rotor magnetic steel, and the rotor assembly 7 is integrally injection molded. The stator assembly comprises a stator shielding sleeve 4 and a stator assembly 5 wrapped by the stator shielding sleeve 4. The rotor assembly 7 is embedded in the stator assembly and rotates relative to the stator assembly.

[0040] The main structure of the cantilever magnetic pump is that it does not support the rotor assembly 7 and the impeller 3 by a fixed shaft when supporting the rotation, and does not need to support at both ends; a concave cavity 401 is set in the middle of the stator shielding sleeve 4, and a mounting column 402 is protruded at the bottom of the concave cavity 401 toward the impeller 3. A reinforcement member 6 is set in the mounting column 402, and the rotor assembly 7 is embedded in the concave cavity 401 and fixedly rotated outside the mounting column 402. The mounting column 402 passes through the middle of the rotor assembly 7, and the impeller 3 is fixedly connected to the rotor assembly 7. The lower end of the mounting column 402 is fixed and the upper end is suspended to form a cantilever structure, and the mounting column 402 passes through the middle of the rotor assembly 7 to better support the fixed rotor assembly 7 and the impeller 3 to rotate.

[0041] A silicon carbide sleeve 10 is fixed to the inner periphery of the rotor assembly 7, and a ceramic sleeve 11 is fixed to the outer periphery of the mounting column 402. The outer periphery of the ceramic sleeve 11 is slidably matched with the inner periphery of the silicon carbide sleeve 10. A thrust plate 12 is fixed to the bottom of the concave cavity 401. The upper end surface of the thrust plate 12 is against the silicon carbide sleeve 10 and does not contact the rotor assembly 7. The lower end surface of the silicon carbide sleeve 10 is slidably matched with the upper end surface of the thrust plate 12. A flow channel groove 1001 is provided on the inner periphery of the silicon carbide sleeve 10, and a flow channel groove 2 1201 is provided on the upper end surface of the thrust plate 12. The ceramic sleeve 11 and the silicon carbide sleeve 10 with a small gap are used as sliding and rotating parts between the rotor assembly 7 and the mounting column 402, which reduces the radial shaking of the mounting structure of the cantilever rotor assembly 7 and better supports the rotation of the rotor assembly 7 and the impeller 3. A plurality of positioning blocks 411 protrude from the bottom of the cavity 401 toward the cavity 401 , and the positioning blocks 411 are evenly distributed around the mounting column 402 . A fixing groove 1101 cooperating with the positioning blocks 411 is provided at the lower part of the ceramic sleeve 11 , and a fixing portion 412 that can limit the axial movement of the ceramic sleeve 11 protrudes radially from the upper end of the mounting column 402 .

[0042] Embodiment 1: Figure 4 As shown, further, how to make the mounting column 402 in the stator shielding sleeve 4 better support the rotor assembly 7, preferably, the stator shielding sleeve 4 is set as a detachable and fixedly connected shielding upper sleeve 41 and a shielding lower sleeve 42, the mounting column 402 is integrally formed in the middle of the shielding upper sleeve 41, and the bottom of the mounting column 402 is provided with a fixing hole 1 403 opening toward the shielding lower sleeve 42, the shielding lower sleeve 42 has a fixing hole 2 404 that passes through from top to bottom and is opposite to the fixing hole 1 403, and the reinforcement 6 is fixed in the fixing hole 1 403 and the fixing hole 2 404. The shielding upper sleeve 41 is provided with a stepped hole 405 near the mounting column 402, the fixing hole 1 403 is connected to the stepped hole 405, the shielding lower sleeve 42 is protruded with a stepped boss 406 which cooperates with the stepped hole 405 for fixing, the upper part of the stepped boss 406 is embedded in the fixing hole 1 403, the fixing hole 2 404 is arranged in the stepped boss 406, a fixing cylinder 407 is protruded from the middle of the bottom of the fixing hole 1 403 toward the shielding lower sleeve 42, the fixing cylinder 407 is embedded in the upper part of the fixing hole 2 404, a fixing ring 408 protrudes inwardly on the inner circumference of the fixing hole 2 404, the reinforcement member 6 is stepped, and the reinforcement member 6 passes through the fixing hole 2 404 and is threadedly fixed to the fixing cylinder 407.

[0043] Embodiment 2: Figure 3As shown, how to make the mounting post 402 in the stator shielding sleeve 4 better support the rotor assembly 7, preferably, the stator shielding sleeve 4 is set as a shielding upper sleeve 41 and a shielding lower sleeve 42 that are detachably fixedly connected, the mounting post 402 is integrally formed in the middle of the shielding upper sleeve 41, and the bottom of the mounting post 402 is provided with a fixing hole 1 403 opening toward the shielding lower sleeve 42, the shielding lower sleeve 42 has a fixing hole 2 404 that passes through from top to bottom and is opposite to the fixing hole 1 403, and the reinforcement 6 is fixed in the fixing hole 1 403 and the fixing hole 2 404. The metal plate 8 is embedded in the shielding lower sleeve 42, and the metal plate 8 has a middle through hole 801, and the reinforcement 6 passes through the fixing hole 2 404 and the middle through hole 801 of the metal plate 8 and is embedded in the fixing hole 1 403. The metal plate 8 enhances the strength of the shielding lower sleeve 42. The reinforcement 6 passes through the metal plate 8 and the mounting column 402 and is embedded and fixed to each other. The metal plate 8 provides a lateral support for the reinforcement 6 so that the reinforcement 6 and the mounting column 402 have better lateral support, making the rotor assembly 7 and the impeller 3 rotate more stably.

[0044] A plurality of fixed through holes 802 and threaded holes 803 evenly distributed around the central through hole 801 are arranged on the metal plate 8, the metal plate 8 and the shielding lower sleeve 42 are integrally formed, the shielding lower sleeve 42 after forming has a fixing block 409 which fills the fixed through hole 802, the shielding lower sleeve 42 after forming also has a shoulder block 410 which limits the axial movement of the metal plate 8, a fixing part 9 is also arranged at the lower part of the shielding lower sleeve 42, the fixing part 9 covers the bottom of the reinforcement 6 and is fixed to the threaded hole 803 through a threaded part. By fixing the through hole 802 and the fixing block 409 to each other and axially limiting the shoulder block 410, the metal plate 8 is firmly fixed to the shielding lower sleeve 42 to form an integrated piece. After the shielding lower sleeve 42 and the shielding upper sleeve 41 are fixedly connected, the metal plate 8 is wrapped inside and does not contact the medium in the pump chamber. The metal plate 8 and the reinforcement 6 are both in a sealed environment. The strength of the metal plate 8 cooperates with the reinforcement 6 and the mounting column 402 to form a more stable cantilever rotor assembly 7 mounting structure, so that the mounting column 402 can better support the stable rotation of the rotor assembly 7.

[0045] Embodiment 3: Figure 7 , Figure 8As shown, how to further better fix the impeller 3 and the rotor assembly 7 for rotation is preferably provided at the upper end of the rotor assembly 7 with an inwardly retracted neck portion 701, a block 702 protrudes outwardly from the side wall of the neck portion 701, a spring plate 301 protrudes downward from the lower end of the impeller 3, a clamping hole 302 cooperating with the clamping block 702 is provided on the spring plate 301, a plurality of protrusions 703 are also formed on the side wall of the neck portion 701, the protrusions 703 and the clamping block 702 are arranged at intervals from each other, a plurality of fixing plates 303 protrude from the lower part of the impeller 3 toward the rotor assembly 7, the fixing plates 303 are independently suspended relative to the spring plate 301, a clamping groove 304 cooperating with the protrusion 703 is provided on the fixing plates 303, a supporting ring plate 704 opposite to the neck portion 701 protrudes upward from the outer circumference of the rotor assembly 7, the spring plate 301 and the fixing plate 303 are both located between the supporting ring plate 704 and the neck portion 701.

[0046] Embodiment 4: Figure 5 , Figure 6 As shown, how to better fix the impeller 3 and the rotor assembly 7 for rotation is preferably provided with a coaxial ring plate 1 705 and a second ring plate 706 protruding upward from the upper end of the rotor assembly 7, the ring plate 1 705 is located on the outer side of the second ring plate 706, a plurality of second clamping holes 707 are provided on the ring plate 1 705, and a second clamping block 708 protruding toward the second ring plate 706 is also provided on the ring plate 1 705, the second clamping holes 707 and the second clamping block 708 are arranged at intervals from each other, and the impeller 3 A ring plate three 305 protrudes from the lower end, and the ring plate three 305 is located between the ring plate one 705 and the ring plate two 706. A plurality of long strips 306 protrude from the outer circumference of the ring plate three 305 toward the ring plate one 705, and the long strips 306 are tightly matched with the ring plate one 705. A plurality of spring plates two 307 are also protruded from the lower end of the impeller 3, and the spring plates two 307 do not contact the ring plate three 305. The lower end of the spring plate two 307 has a barb portion 308, and the barb portion 308 is fixedly matched with the clamping hole two 707.

[0047] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope defined by the claims of the present invention.

Claims

1. A cantilever magnetic pump, comprising a pump housing (1) and a motor housing (2) which are detachably fixedly connected, a stator assembly being fixedly installed between the pump housing (1) and the motor housing (2), a rotor assembly (7) being embedded in the stator assembly and being relatively rotatable, an impeller (3) being fixedly connected to the rotor assembly (7), the stator assembly comprising a stator shielding sleeve (4) and a stator assembly (5) wrapped by the stator shielding sleeve (4), characterized in that: The stator shielding sleeve (4) has a concave cavity (401) in the middle, a mounting column (402) protrudes from the bottom of the concave cavity (401) toward the impeller (3), a reinforcing member (6) is arranged in the mounting column (402), the rotor assembly (7) is embedded in the concave cavity (401) and is fixedly rotatably sleeved outside the mounting column (402), the mounting column (402) passes through the middle of the rotor assembly (7), and the impeller (3) is fixedly connected to the rotor assembly (7).

2. A cantilever magnetic pump according to claim 1, characterized in that: The stator shielding sleeve (4) comprises a shielding upper sleeve (41) and a shielding lower sleeve (42) which are detachably fixedly connected, the mounting post (402) is located in the middle of the shielding upper sleeve (41), the bottom of the mounting post (402) is provided with a fixing hole 1 (403) opening toward the shielding lower sleeve (42), the shielding lower sleeve (42) has a fixing hole 2 (404) which is opposite to the fixing hole 1 (403) and passes through from top to bottom, and the reinforcement member (6) is fixed in the fixing hole 1 (403) and the fixing hole 2 (404).

3. A cantilever magnetic pump according to claim 2, characterized in that: The shielding upper sleeve (41) is provided with a stepped hole (405) near the mounting column (402), the fixing hole 1 (403) is connected to the stepped hole (405), the shielding lower sleeve (42) is protruded with a stepped boss (406) which is matched and fixed with the stepped hole (405), the upper part of the stepped boss (406) is embedded in the fixing hole 1 (403), the fixing hole 2 (404) is arranged in the stepped boss (406), a fixing cylinder (407) is protruded in the middle of the bottom of the fixing hole 1 (403) toward the shielding lower sleeve (42), the fixing cylinder (407) is embedded in the upper part of the fixing hole 2 (404), a fixing ring (408) is protruded inwardly on the inner circumference of the fixing hole 2 (404), the reinforcing member (6) is stepped, and the reinforcing member (6) passes through the fixing hole 2 (404) and is threadedly fixed to the fixing cylinder (407).

4. A cantilever magnetic pump according to claim 2, characterized in that: The shielding lower sleeve (42) is embedded with a metal plate (8), the metal plate (8) has a central through hole (801), and the reinforcement (6) passes through the second fixing hole (404) and the central through hole (801) of the metal plate (8) and is embedded in the first fixing hole (403).

5. A cantilever magnetic pump according to claim 4, characterized in that: The metal plate (8) has a plurality of fixing through holes (802) and threaded holes (803) evenly distributed around the central through hole (801); the metal plate (8) and the shielding lower sleeve (42) are integrally formed; the shielding lower sleeve (42) after forming has a fixing block (409) filling the fixing through hole (802); the shielding lower sleeve (42) after forming also has a shoulder block (410) for limiting the axial movement of the metal plate (8); a fixing member (9) is also provided at the bottom of the shielding lower sleeve (42); the fixing member (9) covers the bottom of the reinforcement (6) and is fixed to the threaded hole (803) through a threaded member.

6. A cantilever magnetic pump according to any one of claims 1 to 5, characterized in that: A silicon carbide sleeve (10) is fixed on the inner circumference of the rotor assembly (7), a ceramic sleeve (11) is fixed on the outer circumference of the mounting column (402), the outer circumference of the ceramic sleeve (11) is slidably matched with the inner circumference of the silicon carbide sleeve (10), a thrust plate (12) is fixed on the bottom of the cavity (401), the upper end surface of the thrust plate (12) is in contact with the silicon carbide sleeve (10) and does not contact the rotor assembly (7), the lower end surface of the silicon carbide sleeve (10) is slidably matched with the upper end surface of the thrust plate (12), a flow channel groove 1 (1001) is provided on the inner circumference of the silicon carbide sleeve (10), and a flow channel groove 2 (1201) is provided on the upper end surface of the thrust plate (12).

7. A cantilever magnetic pump according to claim 6, characterized in that: A plurality of positioning blocks (411) protrude from the bottom of the cavity (401) toward the cavity (401), and the positioning blocks (411) are evenly distributed around the mounting column (402). A fixing groove (1101) cooperating with the positioning blocks (411) is provided at the lower part of the ceramic sleeve (11), and a fixing portion (412) capable of limiting the axial movement of the ceramic sleeve (11) protrudes radially from the upper end of the mounting column (402).

8. A cantilever magnetic pump according to claim 6, characterized in that: The upper end of the rotor assembly (7) has a neck portion (701) that is retracted inwards, and a clamping block (702) protrudes outwards from the side wall of the neck portion (701). The lower end of the impeller (3) has a spring plate (301) that protrudes downwards, and a clamping hole (302) that cooperates with the clamping block (702) is provided on the spring plate (301). A plurality of protrusions (703) are also formed on the side wall of the neck portion (701), and the protrusions (703) and the clamping block (702) are arranged at intervals from each other. The impeller ( 3) A plurality of fixing plates (303) protrude from the lower part toward the direction of the rotor assembly (7); the fixing plates (303) are independently suspended relative to the spring plate 1 (301); a slot (304) cooperating with the protrusion (703) is provided on the fixing plates (303); a supporting ring plate (704) opposite to the neck portion (701) protrudes upward from the outer circumference of the rotor assembly (7); the spring plate 1 (301) and the fixing plates (303) are both located between the supporting ring plate (704) and the neck portion (701).

9. A cantilever magnetic pump according to claim 6, characterized in that: The upper end of the rotor assembly (7) protrudes upward with a coaxial ring plate 1 (705) and a ring plate 2 (706), the ring plate 1 (705) is located outside the ring plate 2 (706), the ring plate 1 (705) is provided with a plurality of second clamping holes (707), the ring plate 1 (705) is provided with a second clamping block (708) protruding toward the ring plate 2 (706), the second clamping holes (707) and the second clamping block (708) are arranged at intervals, and the lower end of the impeller (3) protrudes with a ring plate 3 (305), the ring plate 3 (306) is provided with a plurality of second clamping holes (707), the ring plate 1 (705) is provided with a second clamping block (708) protruding toward the ring plate 2 (706), the second clamping holes (707) and the second clamping block (708) are arranged at intervals. 5) is located between the ring plate 1 (705) and the ring plate 2 (706), the outer circumference of the ring plate 3 (305) protrudes with a plurality of long strips (306) toward the ring plate 1 (705), the long strips (306) are tightly matched with the ring plate 1 (705), the lower end of the impeller (3) also protrudes with a plurality of spring plates 2 (307), the spring plates 2 (307) are not in contact with the ring plate 3 (305), the lower end of the spring plates 2 (307) has a barb (308), the barb (308) is fixedly matched with the clamping hole 2 (707).

10. A cantilever magnetic pump according to claim 1, characterized in that: A heat dissipation shell (13) is arranged at the lower part of the motor shell (2); the heat dissipation shell (13) is fixed to the stator shielding sleeve (4); and a frequency conversion assembly is fixedly arranged on the heat dissipation shell (13).

Images