Corrosion-resistant magnetic transmission centrifugal pump adopting special ceramic rolling bearing

Abstract

The corrosion-resistant magnetic transmission centrifugal pump adopting the special ceramic rolling bearing comprises a motor, the bottom of the motor is fixedly arranged on the surface of a bottom plate through a machine base, an output shaft of the motor is fixedly connected with a rotor fixing base fixed to the outer side of an outer magnetic rotor, and an isolation sleeve is arranged on the inner side of the outer magnetic rotor. The end part of the isolation sleeve is provided with an isolation sleeve sealing gasket, and the inner side of the isolation sleeve is provided with an inner magnetic rotor. According to the corrosion-resistant magnetic transmission centrifugal pump adopting the special ceramic rolling bearings, the two sets of rolling bearings are both made of special ceramics, and the two sets of rolling bearings are arranged in parallel; a double-support special ceramic rolling bearing is adopted, and the linear contact of a sliding bearing and the surface contact of a plane bearing are changed into the point contact of the special ceramic rolling bearing, so that the heat generated by a friction pair is greatly reduced; the stability of the magnetic transmission centrifugal pump in use is improved, and the service life of the magnetic transmission centrifugal pump is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to centrifugal pump field, concretely is a kind of corrosion-resistant magnetic drive centrifugal pump of special ceramic rolling bearing. BACKGROUND

[0002] Magnetic drive centrifugal pump is a new type of centrifugal pump, it utilizes magnetic drive principle to drive impeller rotation, to realize the delivery of liquid. Compared with traditional centrifugal pump, its biggest feature is the difference of power transmission mode.

[0003] The conventional leakage-free corrosion-resistant magnetic drive centrifugal pump is prone to failure under small and micro flow (0.05~0.5m3 / h) operating conditions, because the internal bearings of the conventional pump are composed of sliding bearings, thrust bearings and shaft sleeves. The sliding bearing structure can withstand large axial and radial forces, but a certain amount of friction heat is generated during high-speed operation. This heat needs to be removed by a fluid pressure difference circuit. Since the rated flow of the magnetic pump is small, the flow of the cooling circulation circuit is insufficient to remove the heat generated by bearing friction, disc friction loss, etc. Therefore, failure is prone to occur during operation. SUMMARY

[0004] The utility model aims at providing a kind of corrosion-resistant magnetic drive centrifugal pump of special ceramic rolling bearing, to solve the defects mentioned in the above background.

[0005] To achieve the above object, a kind of corrosion-resistant magnetic drive centrifugal pump of special ceramic rolling bearing is provided, comprising motor, the motor bottom is fixedly arranged on the surface of bottom plate by the base, and the output shaft of motor is fixedly connected with the rotor fixed seat fixed on the outer side of outer magnetic rotor, the inner side of outer magnetic rotor is provided with isolating sleeve, and the end of isolating sleeve is provided with isolating sleeve sealing pad, while the inner side of isolating sleeve is provided with inner magnetic rotor, and inner magnetic rotor is fixedly installed on pump shaft, and the outer side of both ends of pump shaft is installed with rolling bearing, the end of isolating sleeve is screw-fixed with middle body, and the end of middle body away from isolating sleeve is screw-fixed with pump body, while the inside of pump body is movably installed with impeller, and the inside of pump body is movably installed with pump shaft, and the left end of pump shaft is fixed with impeller by impeller nut.

[0006] Preferably, the pump body and the pump shaft are fixedly connected by a plurality of bolts, and a pump body sealing pad is installed between the pump body and the pump shaft.

[0007] Preferably, the right end of the pump shaft is fixedly connected with the inner magnetic rotor by a rear nut, and the diameter of the pump shaft is greater than 50mm.

[0008] Preferably, the pump shaft is movably installed in the interior of the middle body through two groups of rolling bearings, and the two groups of rolling bearings are both made of special ceramic, and are arranged in parallel.

[0009] Preferably, the axial section of the outer magnetic rotor, the rotor fixing seat, the inner magnetic rotor and the pump shaft is a concentric circle structure, and the outer magnetic rotor and the inner magnetic rotor are isolated through an isolation sleeve, and the section of the isolation sleeve is arranged in a "U" shape.

[0010] Preferably, the interior of the rotor fixing seat is provided with a rotor positioning area, and five groups of positioning grooves are uniformly arranged on the circumferential inner wall of the rotor positioning area, and the circumferential outer wall of the outer magnetic rotor is uniformly provided with five groups of positioning seats.

[0011] Preferably, the positioning seat and the positioning groove are matched in size, the positioning seat is inserted into the interior of the positioning groove, the section of the positioning seat and the positioning groove are both arranged in a dovetail shape, and the outer magnetic rotor is positioned and installed in the interior of the rotor positioning area through the five groups of positioning seats and the positioning grooves.

[0012] Compared with the prior art, the utility model has the advantages that:

[0013] 1. The two groups of rolling bearings are both made of special ceramic, and are arranged in parallel; the double-support special ceramic rolling bearings change the linear contact of the sliding bearing, the surface contact of the plane bearing and the point contact of the special ceramic rolling bearing, so that the heat generated by the friction pair is greatly reduced; the stability of the magnetic transmission centrifugal pump during use is improved, and the service life of the magnetic transmission centrifugal pump is prolonged.

[0014] 2. The diameter of the pump shaft is greater than 50 mm, which is larger than the diameter of the pump shaft of the common type of magnetic transmission centrifugal pump; the diameter of the pump shaft is increased, the inner circulation shaft hole of the pump shaft is increased, the distance between the pump shaft and the bottom of the isolation sleeve is increased, the volume of the bottom of the isolation sleeve is increased, the backflow liquid heated by friction is sent out of the pump cavity, the temperature in the pump cavity is lowered, and the service life of the pump is prolonged.

[0015] 3. The section of the positioning seat and the positioning groove is arranged in a dovetail shape, and the outer magnetic rotor is positioned and installed in the interior of the rotor positioning area through the five groups of positioning seats and the positioning grooves; the positioning seat and the positioning groove have good guiding property and positioning precision, the outer magnetic rotor can be accurately installed in place in the interior of the pump shell, the relative position precision between the outer magnetic rotor and the inner magnetic rotor is ensured, efficient magnetic transmission is realized, the impeller can stably rotate synchronously with the outer magnetic rotor, and the operation reliability and the hydraulic performance of the pump are improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a structure front view schematic diagram of the utility model;

[0017] Figure 2 It is a schematic diagram of outer magnetic rotor and its connecting structure;

[0018] Figure 3 It is Figure 2 The bottom view;

[0019] Figure 4 It is Figure 2 The sectional view.

[0020] The figure mark: 1, pump body; 2, impeller nut; 3, impeller; 4, pump body sealing gasket; 5, middle body; 6, rolling bearing; 7, pump shaft; 8, isolating sleeve sealing gasket; 9, isolating sleeve; 10, inner magnetic rotor; 11, outer magnetic rotor; 111, positioning seat; 112, rotor fixing seat; 113, positioning groove; 114, rotor positioning area; 12, rear nut; 13, support; 14, motor; 15, bottom plate. DETAILED DESCRIPTION

[0021] The technical scheme in the embodiments of the utility model will be described clearly and completely below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0022] Please refer to Figures 1-4 The utility model provides a kind of corrosion-resistant magnetic drive centrifugal pump of special ceramic rolling bearing, including motor 14, motor 14 bottom is fixedly arranged on the surface of bottom plate 15 by motor base, and the output shaft of motor 14 is fixedly connected with the rotor fixing seat 112 fixed on the outer side of outer magnetic rotor 11, the inner side of outer magnetic rotor 11 is provided with isolating sleeve 9, and the end of isolating sleeve 9 is provided with isolating sleeve sealing gasket 8, while the inner side of isolating sleeve 9 is provided with inner magnetic rotor 10, and inner magnetic rotor 10 is fixedly installed on pump shaft 7, and rolling bearing 6 is installed on the circumferential outer side of both ends of pump shaft 7, the end of isolating sleeve 9 is fixedly connected with middle body 5, and the end of middle body 5 away from isolating sleeve 9 is fixedly connected with pump body 1, while pump body 1 is movably installed with impeller 3 in its interior, and pump shaft 7 is movably installed in the interior of pump body 1, and the left end of pump shaft 7 is fixedly connected with impeller 3 by impeller nut 2.

[0023] Working principle: when the motor 14 starts, the pump shaft 7 drives the outer magnetic rotor 11 to rotate; the rotating magnetic field generated by the outer magnetic rotor 11 acts on the inner magnetic rotor 10 through the isolation sleeve 9; due to the interaction of the magnetic field, the inner magnetic rotor 10 rotates synchronously; the inner magnetic rotor 10 drives the pump shaft 7 and impeller 3 connected thereto to rotate; when the impeller 3 rotates, the liquid between the blades is thrown out of the impeller 3 under the action of centrifugal force, forming a low pressure area at the center of the impeller 3; under the action of external pressure, liquid is continuously sucked into the center of the impeller 3, and then thrown out of the impeller 3, through the flow passage of the pump body 1, and discharged from the outlet of the pump, thereby realizing the delivery of liquid;

[0024] The pump shaft 7 is movably installed in the inner part of the middle body 5 through two groups of rolling bearings 6, and the two groups of rolling bearings 6 are both made of special ceramic, and are arranged in parallel; the double support special ceramic rolling bearing 6 changes the linear contact of the sliding bearing and the surface contact of the plane bearing to the point contact of the special ceramic rolling bearing 6, greatly reducing the heat generated by the friction pair; improve the stability of the magnetic drive centrifugal pump during use, and improve the service life of the magnetic drive centrifugal pump;

[0025] The diameter of the pump shaft 7 is greater than 50mm, which is larger than the diameter of the pump shaft of the usual type of magnetic drive centrifugal pump; increasing the diameter of the pump shaft 7, at the same time, increasing the inner circulation shaft hole of the pump shaft 7, increasing the distance between the pump shaft 7 and the bottom of the isolation sleeve 9, increasing the volume of the bottom of the isolation sleeve 9, sending the backflow liquid heated by friction heat out of the pump cavity, so that the temperature in the pump cavity reaches a lower temperature rise, thereby prolonging the service life of the pump;

[0026] The cross section of the positioning seat 111 and the positioning groove 113 is dovetail-shaped, and the outer magnetic rotor 11 is positioned and installed inside the rotor positioning area 114 through five groups of positioning seats 111 and positioning grooves 113; the positioning seat 111 and the positioning groove 113 have good guiding property and positioning accuracy, which can ensure that the outer magnetic rotor 11 is accurately installed in place inside the pump shell, ensure the relative position accuracy between the outer magnetic rotor 11 and the inner magnetic rotor 10, thereby realizing efficient magnetic force transmission, making the impeller can stably follow the outer magnetic rotor 11 to rotate synchronously, improving the operation reliability and hydraulic performance of the pump; the dovetail-shaped matching mode can form a close connection between the positioning seat and the outer magnetic rotor 11, effectively preventing the outer magnetic rotor 11 from shifting or shaking during high-speed rotation; when the magnetic drive pump is running, the outer magnetic rotor 11 is subjected to the driving torque of the motor and the magnetic force between the inner magnetic rotor 10, the dovetail-shaped positioning seat 111 and the positioning groove 113 can withstand these forces and keep the outer magnetic rotor 11 stable, reduce the vibration and noise caused by the rotor shaking, and prolong the service life of the pump.

[0027] The pump body 1 and the pump shaft 7 are fixedly connected by a plurality of groups of bolts, and the pump body 1 and the pump shaft 7 are provided with a pump body sealing gasket 4, and the pump body 1 and the pump shaft 7 are sealingly connected through the pump body sealing gasket 4.

[0028] As a preferred embodiment, the right end of the pump shaft 7 is fixedly connected with the inner magnetic rotor 10 through the rear nut 12, and the diameter of the pump shaft 7 is greater than 50 mm.

[0029] The pump shaft 7 is movably installed in the inner part of the middle body 5 through two groups of rolling bearings 6, and the two groups of rolling bearings 6 are both made of special ceramics, and the two groups of rolling bearings 6 are arranged in parallel; the end of the middle body 5 away from the pump body 1 is screw-connected with a support 13, and the right end of the support 13 is screw-fixed on the left side end surface of the motor 14.

[0030] As a preferred embodiment, the axial section of the outer magnetic rotor 11, the rotor fixing seat 112, the inner magnetic rotor 10 and the pump shaft 7 is a concentric circle structure, and the outer magnetic rotor 11 and the inner magnetic rotor 10 are isolated through the isolation sleeve 9, and the section of the isolation sleeve 9 is arranged in a "U" shape.

[0031] As a preferred embodiment, the inner part of the rotor fixing seat 112 is provided with a rotor positioning area 114, and the circumferential inner wall of the rotor positioning area 114 is uniformly provided with five groups of positioning grooves 113, and the circumferential outer wall of the outer magnetic rotor 11 is uniformly provided with five groups of positioning seats 111.

[0032] The positioning seat 111 and the positioning groove 113 are matched in size, the positioning seat 111 is inserted into the inner part of the positioning groove 113, the section of the positioning seat 111 and the positioning groove 113 are both arranged in a dovetail shape, and the outer magnetic rotor 11 is positioned and installed in the inner part of the rotor positioning area 114 through the five groups of positioning seats 111 and the positioning grooves 113.

[0033] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A corrosion-resistant magnetic drive centrifugal pump employing special ceramic rolling bearings, comprising a motor (14), characterized in that: The bottom of the motor (14) is fixedly mounted on the surface of the base plate (15) by the base, and the output shaft of the motor (14) is fixedly connected to the rotor fixing seat (112) fixed on the outside of the outer magnetic rotor (11). An isolation sleeve (9) is provided on the inner side of the outer magnetic rotor (11), and an isolation sleeve sealing gasket (8) is provided at the end of the isolation sleeve (9). An inner magnetic rotor (10) is provided on the inner side of the isolation sleeve (9), and the inner magnetic rotor (10) is fixedly mounted on the pump shaft (7). Rolling bearings (6) are installed on the outer circumference of both ends of the pump shaft (7). The end of the isolation sleeve (9) is screwed to the middle body (5), and the pump body (1) is screwed to the end of the middle body (5) away from the isolation sleeve (9). An impeller (3) is movably mounted inside the pump body (1), and the pump shaft (7) is movably mounted inside the pump body (1). The left end of the pump shaft (7) is fixed to the impeller (3) by the impeller nut (2).

2. The corrosion-resistant magnetic drive centrifugal pump using a special ceramic rolling bearing according to claim 1, characterized in that: The pump body (1) and the pump shaft (7) are evenly fixedly connected by multiple sets of bolts, and a pump body sealing gasket (4) is installed between the pump body (1) and the pump shaft (7). At the same time, the pump body (1) and the pump shaft (7) are sealed together by the pump body sealing gasket (4).

3. A corrosion-resistant magnetic drive centrifugal pump using a special ceramic rolling bearing according to claim 1, characterized in that: The right end of the pump shaft (7) is fixedly connected to the inner magnetic rotor (10) by a rear nut (12), and the diameter of the pump shaft (7) is greater than 50mm.

4. A corrosion-resistant magnetic drive centrifugal pump using a special ceramic rolling bearing according to claim 3, characterized in that: The pump shaft (7) is movably installed inside the middle body (5) through two sets of rolling bearings (6), and both sets of rolling bearings (6) are made of special ceramics. The two sets of rolling bearings (6) are arranged in parallel. A bracket (13) is screwed onto the end of the middle body (5) away from the pump body (1), and the right end of the bracket (13) is screwed onto the left end face of the motor (14).

5. A corrosion-resistant magnetic drive centrifugal pump using a special ceramic rolling bearing according to claim 1, characterized in that: The axial cross-section of the outer magnetic rotor (11), rotor fixing seat (112), inner magnetic rotor (10) and pump shaft (7) is a concentric circle structure, and the outer magnetic rotor (11) and inner magnetic rotor (10) are isolated by an isolation sleeve (9), and the cross-section of the isolation sleeve (9) is U-shaped.

6. A corrosion-resistant magnetic drive centrifugal pump using a special ceramic rolling bearing according to claim 5, characterized in that: The rotor fixing seat (112) has a rotor positioning area (114) inside, and five sets of positioning grooves (113) are evenly provided on the inner circumference of the rotor positioning area (114), while five sets of positioning seats (111) are evenly fixed on the outer circumference of the outer magnetic rotor (11).

7. A corrosion-resistant magnetically driven centrifugal pump using a special ceramic rolling bearing according to claim 6, characterized in that: The positioning seat (111) is adapted to the size of the positioning groove (113), and the positioning seat (111) is inserted into the inside of the positioning groove (113). At the same time, the cross-section of the positioning seat (111) and the positioning groove (113) are both dovetail-shaped. Meanwhile, the external magnetic rotor (11) is positioned and installed inside the rotor positioning area (114) through five sets of positioning seats (111) and positioning grooves (113).

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