Magnetic drive pump with corrosion-resistant interior

Abstract

The utility model relates to the technical field of magnetic drive pumps, in particular to a magnetic drive pump with an anti-corrosion interior. Comprising a hollow connector, two ends of the hollow connector are connected with a pump shell and a bearing box respectively, an annular containing cavity and a pump cover are arranged on the inner wall of the end, close to the hollow connector, of the pump shell, a first rotating shaft and an outer magnetic rotor are arranged in the containing cavity of the hollow connector, the first rotating shaft extends into the pump shell, and two ends of the first rotating shaft are provided with impellers and an inner magnetic rotor respectively; the inner wall of the outer magnetic rotor is covered with a protective sleeve, a second rotating shaft in the bearing box is connected with the outer magnetic rotor and a driving device, an isolation sleeve with an axial opening in one side is arranged between the protective sleeve and the inner magnetic rotor, and the opening end is installed on the pump cover in a sealed mode. The problems of leakage, component displacement and pressure instability caused by insufficient sealing of a traditional magnetic drive pump are solved, the sealing performance, the operation stability and the corrosion resistance of equipment are improved, the service life is prolonged, and the maintenance cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to magnetic force pump technical field, especially internal corrosion -resistant magnetic force pump. BACKGROUND

[0002] Magnetic force pump is a kind of sealed pump that realizes contactless transmission by magnetic coupling, is widely used in the transportation of corrosive, toxic medium in chemical industry, medicine and other fields, and its core advantage lies in eliminating the leakage risk of traditional mechanical seal, however, when conveying strong corrosive medium for a long time, the rotating parts inside pump body are easily eroded by medium penetration, which makes magnetic coupling efficiency decline or even fail, resulting in low reliability of magnetic force pump and short service life, therefore, an internal corrosion -resistant magnetic force pump is urgently needed to solve the above problems. SUMMARY

[0003] In order to overcome the above-mentioned deficiencies of the prior art, the utility model provides an internal corrosion -resistant magnetic force pump, which solves the technical problem that the rotating parts inside the pump body are easily eroded by medium penetration when the magnetic force pump transports corrosive medium.

[0004] In order to achieve the above-mentioned purpose, the utility model is realized through the following technical scheme:

[0005] An internal corrosion -resistant magnetic force pump, comprising: a hollow coupling body, the two ends of the hollow coupling body are respectively provided with a pump shell and a bearing box, the inner wall of the pump shell near one end of the hollow coupling body is provided with an annular receiving cavity, a pump cover is arranged in the annular receiving cavity, a cavity is arranged in the hollow coupling body, a first rotating shaft and an outer magnetic rotor are arranged in the cavity, the first rotating shaft extends axially into the pump shell, an impeller and an inner magnetic rotor are mounted at the two ends of the first rotating shaft respectively, the inner magnetic rotor and the outer magnetic rotor are arranged in magnetic coupling, a protective sleeve is arranged on the inner wall of the outer magnetic rotor, the protective sleeve is used for protecting the inner wall of the outer magnetic rotor, a second rotating shaft is arranged in the bearing box, the two ends of the second rotating shaft are connected with the outer magnetic rotor and a driving device respectively, a one-way axial opening isolation sleeve is arranged between the protective sleeve and the inner magnetic rotor, and the opening end of the isolation sleeve is sealingly mounted on the pump cover.

[0006] Based on the above structure, the principle of the internal corrosion-resistant magnetic drive pump is that after the driving device is started, the output power drives the second rotating shaft to rotate, the second rotating shaft transmits power to the outer magnetic rotor connected thereto, so that the outer magnetic rotor rotates synchronously, and since the outer magnetic rotor and the inner magnetic rotor are coupled by magnetic force, contactless power transmission is achieved. The inner magnetic rotor rotates under the action of magnetic force, and then drives the impeller mounted on the first rotating shaft to rotate, so as to achieve the function of conveying liquid. The protective sleeve arranged on the inner wall of the outer magnetic rotor can effectively isolate the corrosive medium in the complex working environment of the magnetic drive pump, avoid direct contact between the corrosive medium and the inner wall of the outer magnetic rotor, prevent the outer magnetic rotor from being corroded by the corrosive medium, reduce the problems of component wear and magnetic force weakening caused by corrosion, improve the corrosion resistance of the outer magnetic rotor, ensure the stable magnetism of the outer magnetic rotor, ensure the efficient and stable magnetic coupling operation between the inner magnetic rotor and the outer magnetic rotor, prolong the service life of the magnetic drive pump, and reduce the maintenance cost and replacement frequency of the equipment. The isolation sleeve plays a further isolation and protection role, prevents the leakage of the conveying medium in the pump housing into the hollow connecting body, and avoids the damage of the conveying medium to the components in the hollow connecting body.

[0007] Further, the internal corrosion-resistant magnetic drive pump in the present application is provided with a sealing assembly on the two sides of the hollow connecting body along the axial direction of the pump cover, and the sealing assembly comprises a first annular sealing element arranged between the axial abutting surface of the pump cover and the pump housing. As a preferred scheme of the present application, the first annular sealing element can fill the small gap between the pump cover and the pump housing, prevent the leakage of the medium conveyed in the pump housing from the abutting surface to the external environment, and ensure the stability of the pressure in the pump during the operation of the magnetic drive pump, so that the magnetic drive pump can work under the designed working condition.

[0008] Further, the internal corrosion-resistant magnetic drive pump in the present application further comprises a second annular sealing element, the second annular sealing element is embedded on the outer side surface of the pump cover near the hollow connecting body, and the second annular sealing element is located between the axial abutting surface of the pump cover and the isolation sleeve. Corresponding to the second annular sealing element, an annular recess is arranged on the outer side surface of the pump cover, and the annular recess is used for accommodating the second annular sealing element. As a preferred scheme of the present application, the second annular sealing element can prevent the leakage of the medium from the gap between the pump cover and the isolation sleeve to the inside of the hollow connecting body, and avoid the erosion of the components in the hollow connecting body by the medium.

[0009] Further, the internal anti-corrosion magnetic drive pump of the present application, the convex part is arranged along the circumferential direction of the pump cover, when the isolating sleeve is installed on the pump cover, the isolating sleeve is arranged on the convex part, and the convex part is in abutment with the inner wall of the isolating sleeve in the radial direction of the hollow coupling body. As a preferred scheme of the present application, the internal anti-corrosion magnetic drive pump of the present application, the convex part is used to limit the radial movement of the isolating sleeve after installation, so as to avoid displacement of the isolating sleeve due to factors such as vibration and medium pressure during operation of the magnetic drive pump, thereby affecting the sealing effect and normal operation of the equipment; when the isolating sleeve is installed, the convex part provides installation guidance for the isolating sleeve, so that the installation personnel can accurately cover the isolating sleeve on the convex part, to ensure that the installation position of the isolating sleeve is accurate, thereby improving the convenience and efficiency of installation.

[0010] Further, the internal anti-corrosion magnetic drive pump of the present application, the convex part is arranged along the circumferential direction of the pump cover, when the isolating sleeve is installed on the pump cover, the isolating sleeve is arranged on the convex part, and the convex part is in abutment with the inner wall of the isolating sleeve in the radial direction of the hollow coupling body. As a preferred scheme of the present application, the internal anti-corrosion magnetic drive pump of the present application, the convex part is used to limit the radial movement of the isolating sleeve after installation, so as to avoid displacement of the isolating sleeve due to factors such as vibration and medium pressure during operation of the magnetic drive pump, thereby affecting the sealing effect and normal operation of the equipment; when the isolating sleeve is installed, the convex part provides installation guidance for the isolating sleeve, so that the installation personnel can accurately cover the isolating sleeve on the convex part, to ensure that the installation position of the isolating sleeve is accurate, thereby improving the convenience and efficiency of installation.

[0011] Further, the internal anti-corrosion magnetic drive pump of the present application, the convex part is arranged along the circumferential direction of the pump cover, when the isolating sleeve is installed on the pump cover, the isolating sleeve is arranged on the convex part, and the convex part is in abutment with the inner wall of the isolating sleeve in the radial direction of the hollow coupling body. As a preferred scheme of the present application, the internal anti-corrosion magnetic drive pump of the present application, the convex part is used to limit the radial movement of the isolating sleeve after installation, so as to avoid displacement of the isolating sleeve due to factors such as vibration and medium pressure during operation of the magnetic drive pump, thereby affecting the sealing effect and normal operation of the equipment; when the isolating sleeve is installed, the convex part provides installation guidance for the isolating sleeve, so that the installation personnel can accurately cover the isolating sleeve on the convex part, to ensure that the installation position of the isolating sleeve is accurate, thereby improving the convenience and efficiency of installation.

[0012] Further, the internal anti-corrosion magnetic drive pump of the present application, the second rotating shaft and the bearing box are provided with a bearing, the bearing is sleeved on the second rotating shaft, and the bearing is installed on the bearing box. As a preferred embodiment of the present application, during the operation of the magnetic drive pump, the second rotating shaft needs to rotate at high speed to transmit power, the bearing can bear the radial and axial loads of the second rotating shaft, so that the second rotating shaft can maintain the correct rotation axis, avoid the problems of bending, deformation or excessive vibration of the rotating shaft due to uneven force, and ensure the stability and reliability of the rotation of the second rotating shaft; and the bearing enables the second rotating shaft to rotate more smoothly, reduces energy loss, and improves the transmission efficiency of the magnetic drive pump.

[0013] Further, the internal anti-corrosion magnetic drive pump of the present application further comprises: a pair of sliding bearings and a pair of thrust bearings, the pair of sliding bearings and the pair of thrust bearings are sleeved on the first rotating shaft, the pair of sliding bearings are located between the pair of thrust bearings, the sliding bearings are installed on the pump cover, and the pair of thrust bearings are respectively in abutment with the corresponding sliding bearings in the axial direction of the first rotating shaft. As a preferred embodiment of the present application, during the operation of the magnetic drive pump, the first rotating shaft drives the impeller to rotate at high speed, the sliding bearing can bear the radial load generated by the rotation of the first rotating shaft, so that the first rotating shaft can maintain the correct radial position during rotation, prevent the rotating shaft from radial deviation or shaking, and thus maintain the normal operation of the impeller and ensure the stability of the flow and lift of the pump; at the same time, the thrust bearing is used to bear the axial load of the first rotating shaft, and a certain axial force is generated when the impeller rotates to transport liquid, and the thrust bearing can effectively offset the axial force, so that the first rotating shaft can maintain stability in the axial direction.

[0014] Further, the internal anti-corrosion magnetic drive pump of the present application, the sliding bearing and the first rotating shaft are provided with a shaft sleeve, and the inner and outer surfaces of the shaft sleeve are matched with the first rotating shaft and the sliding bearing respectively. As a preferred embodiment of the present application, during the operation of the magnetic drive pump, relative rotation and friction exist between the sliding bearing and the first rotating shaft, the shaft sleeve can bear the friction and wear, avoid the direct contact between the first rotating shaft and the sliding bearing, and the first rotating shaft is worn out, when the shaft sleeve is worn or damaged, only the new shaft sleeve needs to be disassembled and installed, and the first rotating shaft does not need to be complicatedly maintained or replaced, so that the maintenance efficiency of the equipment is improved, the downtime is reduced, and the downtime loss is reduced.

[0015] The above technical scheme can be seen that the present application has the following beneficial effects:

[0016] The purpose of this invention is to provide an internally corrosion-resistant magnetic pump. By setting an anti-corrosion protective sleeve on the inner wall of the outer magnetic rotor, setting a double sealing component between the pump cover and the isolation sleeve, and a radial positioning structure between the pump cover and the isolation sleeve, it effectively prevents corrosive media from intruding into the outer magnetic rotor and the hollow connecting body. At the same time, it solves the problems of media leakage, component displacement and pressure instability caused by insufficient sealing in traditional magnetic pumps, thereby improving the equipment's sealing performance, operational stability and corrosion resistance, extending service life and reducing maintenance costs. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of an internally corrosion-resistant magnetic pump according to an embodiment of this application;

[0018] Figure 2 for Figure 1 A magnified view of a portion of area A in the middle circle.

[0019] In the figure: 1-Hollow connecting body; 10-Cavity; 11-First rotating shaft; 12-Outer magnetic rotor; 13-Impeller; 14-Inner magnetic rotor; 15-Protective sleeve; 151-Extension; 16-Second rotating shaft; 17-Isolation sleeve; 2-Pump casing; 3-Bearing housing; 4-Pump cover; 40-Annular notch; 41-Protrusion; 5-Sealing assembly; 51-First annular seal; 52-Second annular seal; 6-Bearing; 7-Sliding bearing; 71-Shaft sleeve; 8-Thrust bearing. Detailed Implementation

[0020] like Figure 1 , 2 As shown, an internally corrosion-resistant magnetic pump includes: a hollow connector 1, with a pump casing 2 and a bearing housing 3 respectively at both ends of the hollow connector 1; an annular receiving cavity 20 is provided on the inner wall of the pump casing 2 near one end of the hollow connector 1; a pump cover 4 is provided inside the annular receiving cavity 20; a cavity 10 is provided inside the hollow connector 1; a first rotating shaft 11 and an external magnetic rotor 12 are provided inside the cavity 10; the first rotating shaft 11 extends axially into the pump casing 2; and impellers 13 are respectively installed at both ends of the first rotating shaft 11. An inner magnetic rotor 14 is magnetically coupled to an outer magnetic rotor 12. A protective sleeve 15 is provided on the inner wall of the outer magnetic rotor 12 to protect the inner wall of the outer magnetic rotor 12. A second rotating shaft 16 is provided in the bearing housing 3. The two ends of the second rotating shaft 16 are respectively connected to the outer magnetic rotor 12 and the drive device. An isolation sleeve 17 with a single-sided axial opening is provided between the protective sleeve 15 and the inner magnetic rotor 14. The opening end of the isolation sleeve 17 is sealed and installed on the pump cover 4.

[0021] Based on the above structure, the principle of the internal corrosion-resistant magnetic pump is that: after the driving device is started, the output power drives the second shaft 16 to rotate, the second shaft 16 transmits power to the outer magnetic rotor 12 connected thereto, so that the outer magnetic rotor 12 rotates synchronously, and since the outer magnetic rotor 12 and the inner magnetic rotor 14 are coupled by magnetic force, contactless power transmission is achieved. The inner magnetic rotor 14 rotates under the action of magnetic force, and then drives the impeller 13 mounted on the first shaft 11 to rotate, so as to achieve the function of conveying liquid. The protective sleeve 15 arranged on the inner wall of the outer magnetic rotor 12 can effectively isolate the corrosive medium in the complex working environment of the outer magnetic rotor 12, avoid direct contact between the corrosive medium and the inner wall of the outer magnetic rotor 12, prevent the outer magnetic rotor 12 from being corroded by the corrosive medium, reduce the problems of component wear and magnetic force weakening caused by corrosion, improve the corrosion resistance of the outer magnetic rotor 12, ensure the stable magnetism of the outer magnetic rotor 12, ensure the efficient and stable magnetic coupling operation between the inner magnetic rotor 14 and the outer magnetic rotor 12, prolong the service life of the magnetic pump, and reduce the maintenance cost and replacement frequency of the equipment. The isolation sleeve 17 plays a further isolation and protection role, prevents the leakage of the conveying medium in the pump shell 2 into the hollow connecting body 1, and avoids the damage of the conveying medium to the components in the hollow connecting body 1. The driving device adopts a motor.

[0022] In the embodiment, the pump cover 4 is provided with a sealing assembly 5 on both sides of the hollow connecting body 1 in the axial direction. The sealing assembly 5 comprises a first annular sealing element 51 arranged between the axial abutting surface of the pump cover 4 and the pump shell 2. The first annular sealing element 51 can fill the small gap between the pump cover 4 and the pump shell 2, avoid the leakage of the medium conveyed in the pump shell 2 from the abutting surface to the external environment, and ensure the stability of the pressure in the pump during the operation of the magnetic pump, so that the magnetic pump can work under the designed working condition. The first annular sealing element 51 adopts an O-shaped rubber sealing ring.

[0023] In the embodiment, the sealing assembly 5 further comprises a second annular sealing element 52 embedded on the outer side surface of the pump cover 4 close to the hollow connecting body 1. The second annular sealing element 52 is located between the axial abutting surface of the pump cover 4 and the isolation sleeve 17. Corresponding to the second annular sealing element 52, the outer side surface of the pump cover 4 is provided with an annular recess 40 for accommodating the second annular sealing element 52. The second annular sealing element 52 can prevent the medium from leaking from the gap between the pump cover 4 and the isolation sleeve 17 to the inside of the hollow connecting body 1, and avoid the erosion of the medium to the components in the hollow connecting body 1. The second annular sealing element 52 adopts an O-shaped rubber sealing ring.

[0024] In the embodiment, the pump cover 4 is provided with a protrusion 41 on the outer side of the hollow coupling body 1, the protrusion 41 extends along the circumference of the pump cover 4, when the isolation sleeve 17 is installed on the pump cover 4, the isolation sleeve 17 covers the protrusion 41, and the protrusion 41 abuts on the inner wall of the isolation sleeve 17 in the radial direction of the hollow coupling body 1. The protrusion 41 is used to limit the radial movement of the isolation sleeve 17 after installation, so as to avoid displacement of the isolation sleeve 17 due to vibration, medium pressure and other factors during operation of the magnetic drive pump, thereby affecting the sealing effect and normal operation of the equipment; when the isolation sleeve 17 is installed, the protrusion 41 provides installation guidance for the isolation sleeve 17, so that the installation personnel can accurately cover the isolation sleeve 17 on the protrusion 41, to ensure that the installation position of the isolation sleeve 17 is accurate, thereby improving the convenience and efficiency of installation.

[0025] In the embodiment, the protection sleeve 15 is provided with an extension 151 at one end of the pump cover 4, the extension 151 extends radially outward along the hollow coupling body 1, and the extension 151 abuts on the inner magnetic rotor 14 in the axial direction of the hollow coupling body 1. The protection sleeve 15 is used to isolate the corrosive medium from the outside, so as to avoid direct contact between the corrosive medium and the inner wall of the outer magnetic rotor 12. The extension 151 extends radially outward and abuts on the inner magnetic rotor 14 in the axial direction, which can prevent the corrosive medium from entering through the gap between the protection sleeve 15 and the inner magnetic rotor 14, prevent corrosion of the inner wall of the outer magnetic rotor 12, and ensure the normal operation of the magnetic coupling. At the same time, the extension 151 can provide additional support for the protection sleeve 15. When the magnetic drive pump is running, the outer magnetic rotor 12 rotates at high speed and generates vibration and force. The abutment of the extension 151 and the outer magnetic rotor 12 can prevent the protection sleeve 15 from being displaced or loosened, so as to ensure that the protection sleeve 15 is always stably covered on the inner wall of the outer magnetic rotor 12. The protection sleeve 15 is installed on the outer magnetic rotor 12 by bolts (not shown), a group of installation holes are arranged on the extension 151 along the circumference of the hollow coupling body 1, and the installation holes are used to accommodate the bolts.

[0026] In the embodiment, the material of the protection sleeve 15 is a magnetically conductive corrosion-resistant alloy. During operation of the magnetic drive pump, the outer magnetic rotor 12 is in a complex working environment and may be in contact with corrosive medium. The magnetically conductive corrosion-resistant alloy can effectively isolate the corrosive medium from the outside, prevent corrosion of the outer magnetic rotor 12, reduce component wear and weakening of magnetic force caused by corrosion, prolong the service life of the outer magnetic rotor 12, and ensure stable operation of the magnetic drive pump. The protection sleeve 15 is made of stainless steel.

[0027] In the embodiment, the second rotating shaft 16 is provided with a bearing 6 between the bearing box 3, the bearing 6 is sleeved on the second rotating shaft 16, and the bearing 6 is installed on the bearing box 3. During the operation of the magnetic pump, the second rotating shaft 16 needs to rotate at a high speed to transmit power, the bearing 6 can bear the radial and axial loads of the second rotating shaft 16, so that the second rotating shaft 16 can keep the correct rotation axis, the problems such as bending, deformation or excessive vibration of the rotating shaft due to uneven force are avoided, and the stability and reliability of the rotation of the second rotating shaft 16 are ensured; and the bearing 6 enables the second rotating shaft 16 to rotate more smoothly, reduces energy loss, and improves the transmission efficiency of the magnetic pump. The bearing 6 is a ball bearing.

[0028] In the embodiment, a pair of sliding bearings 7 and a pair of thrust bearings 8 are further included, the pair of sliding bearings 7 and the pair of thrust bearings 8 are both sleeved on the first rotating shaft 11, the pair of sliding bearings 7 are located between the pair of thrust bearings 8, the sliding bearing 7 is installed on the pump cover 4, and the pair of thrust bearings 8 are respectively in abutment with the corresponding sliding bearings 7 in the axial direction of the first rotating shaft 11. During the operation of the magnetic pump, the first rotating shaft 11 drives the impeller 13 to rotate at a high speed, the sliding bearing 7 can bear the radial load generated by the rotation of the first rotating shaft 11, so that the first rotating shaft 11 can keep the correct radial position during the rotation process, the radial deviation or shaking of the rotating shaft is prevented, the normal operation of the impeller 13 is maintained, and the stability of the flow and the lift of the pump is ensured; meanwhile, the thrust bearing 8 is used for bearing the axial load of the first rotating shaft 11, when the impeller 13 rotates to transport liquid, certain axial force is generated, the thrust bearing 8 can effectively offset the axial force, so that the first rotating shaft 11 keeps stable in the axial direction.

[0029] In the embodiment, a shaft sleeve 71 is arranged between the sliding bearing 7 and the first rotating shaft 11, and the inner and outer surfaces of the shaft sleeve 71 are matched with the first rotating shaft 11 and the sliding bearing 7 respectively. During the operation of the magnetic pump, relative rotation and friction exist between the sliding bearing 7 and the first rotating shaft 11, the shaft sleeve 71 can bear the friction and wear, so that the first rotating shaft 11 is prevented from being worn by directly contacting with the sliding bearing 7, when the shaft sleeve 71 is worn or damaged, only the new shaft sleeve 71 needs to be disassembled and installed, and the first rotating shaft 11 does not need to be complicatedly maintained or replaced, so that the maintenance efficiency of the equipment is improved, the downtime is reduced, and the downtime loss is reduced.

[0030] The technical principle of the utility model is described in combination with specific embodiments, and these descriptions are only for explaining the principle of the utility model, and cannot be explained as the limitation of the protection scope of the utility model in any way. Based on the explanation herein, the person skilled in the art can think of other specific embodiments of the utility model without creative labor, and these embodiments will fall within the protection scope of the utility model.

Claims

1. A magnetically coupled pump with internal corrosion resistance, characterized by: Include: Hollow coupling body (1), both ends of the hollow coupling body (1) are respectively provided with pump shell (2), bearing box (3), the inner wall of the pump shell (2) near the end of the hollow coupling body (1) is provided with annular receiving cavity (20), the annular receiving cavity (20) is provided with pump cover (4), the hollow coupling body (1) is provided with cavity (10), the cavity (10) is provided with first rotating shaft (11), outer magnetic rotor (12), the first rotating shaft (11) extends to the pump shell (2) in the axial direction, the both ends of the first rotating shaft (11) are respectively provided with impeller (13), inner magnetic rotor (14), the inner magnetic rotor (14) and outer magnetic rotor (12) are arranged in magnetic coupling, the inner wall of the outer magnetic rotor (12) is covered with protective sleeve (15), the protective sleeve (15) is used for protecting the inner wall of the outer magnetic rotor (12), the bearing box (3) is provided with second rotating shaft (16), the both ends of the second rotating shaft (16) are respectively connected with outer magnetic rotor (12), driving device, the protective sleeve (15) and inner magnetic rotor (14) are provided with one-way axial opening isolation sleeve (17), the opening end of the isolation sleeve (17) is sealingly mounted on the pump cover (4).

2. The magnetic drive pump of claim 1, wherein: The pump cover (4) is provided with a sealing assembly (5) on both sides of the hollow coupling body (1) in the axial direction, and the sealing assembly (5) comprises a first annular sealing element (51) arranged between the axial abutting surface of the pump cover (4) and the pump shell (2).

3. A magnetically coupled pump with internal corrosion protection according to claim 2, characterized in that: The sealing assembly (5) further comprises a second annular sealing element (52) embedded on the outer side of the pump cover (4) near the hollow coupling body (1), and the second annular sealing element (52) is located between the axial abutting surface of the pump cover (4) and the isolation sleeve (17). Corresponding to the second annular sealing element (52), the outer side of the pump cover (4) is provided with an annular recess (40) for accommodating the second annular sealing element (52).

4. The internally corrosion resistant magnetic drive pump of claim 1 wherein: The pump cover (4) is provided with a convex portion (41) on the outer side near the hollow coupling body (1), and the convex portion (41) extends along the circumference of the pump cover (4). When the isolation sleeve (17) is mounted on the pump cover (4), the isolation sleeve (17) is covered on the convex portion (41), and the convex portion (41) abuts on the inner wall of the isolation sleeve (17) in the radial direction of the hollow coupling body (1).

5. The internally corrosion resistant magnetic drive pump of claim 1 wherein: The protective sleeve (15) is provided with an extension (151) at one end near the pump cover (4), and the extension (151) extends outward in the radial direction of the hollow coupling body (1). The extension (151) abuts on the outer magnetic rotor (12) in the axial direction of the hollow coupling body (1).

6. The internally corrosion resistant magnetic drive pump of claim 1 wherein: The material of the protective sleeve (15) is magnetically conductive corrosion-resistant alloy.

7. The internally corrosion resistant magnetic drive pump of claim 1 wherein: The second rotating shaft (16) and the bearing box (3) are provided with a bearing (6), the bearing (6) is sleeved on the second rotating shaft (16), and the bearing (6) is mounted on the bearing box (3).

8. The internally corrosion resistant magnetic drive pump of claim 1 wherein: Also include: A pair of sliding bearings (7) and a pair of thrust bearings (8), the pair of sliding bearings (7) and the pair of thrust bearings (8) are sleeved on the first rotating shaft (11), the pair of sliding bearings (7) are located between the pair of thrust bearings (8), the sliding bearing (7) is installed on the pump cover (4), and the pair of thrust bearings (8) are respectively in axial abutment on the corresponding sliding bearing (7) on the first rotating shaft (11).

9. A magnetically coupled pump with internal corrosion protection according to claim 8, characterized in that: The sliding bearing (7) is provided with a shaft sleeve (71) between the first rotating shaft (11), and the inner and outer surfaces of the shaft sleeve (71) are matched with the first rotating shaft (11) and the sliding bearing (7) respectively.

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