Long-life magnetic drive pump for conveying liquid chlorine

Abstract

The utility model belongs to the field of magnetic pumps, and particularly relates to a long-life magnetic pump for conveying liquid chlorine, which comprises a pump body, an outer magnetic cylinder, an isolation sleeve, an inner magnet, a pump shaft and an impeller, the outer magnetic cylinder is connected with an output shaft of a motor, the isolation sleeve is arranged between the outer magnetic cylinder and the inner magnet, the inner magnet is fixedly connected with the impeller, and the pump shaft is fixedly connected with the pump body. The pump shaft is installed on the isolation sleeve, the impeller is arranged in the pump body and arranged at the front end of the pump shaft, a pump body wear ring is embedded in the liquid inlet end of the pump body, an impeller wear ring is arranged at the position of an inlet of the impeller, an arc-shaped protrusion is arranged on the pump body wear ring, a flexible elastic piece is arranged on the impeller wear ring, and the flexible elastic piece is arranged on the pump body wear ring. According to the magnetic drive pump, the abrasion of the magnetic drive pump can be reduced, and the service life of the magnetic drive pump is effectively prolonged.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of magnetic force pump, concretely relates to a long life magnetic force pump of conveying liquid chlorine. BACKGROUND

[0002] Liquid chlorine is highly toxic, vaporizes into gas under normal pressure, can cause serious poisoning when inhaled, has intense stimulating effect and corrosiveness, and can burn and explode when mixed with other flammable gases under sunlight, is active in nature, and almost has corrosive effect on metals and non-metals. Ordinary pumps are easily corroded during the conveying of liquid chlorine, leading to damage of the pump and risk of leakage, therefore, the pump for conveying liquid chlorine must have high corrosion resistance and sealing property to ensure safe and efficient operation. The sealing property of the magnetic force pump is good, but the rear end of the pump shaft of the traditional magnetic force pump is connected with the isolation sleeve, the front end of the pump shaft is connected with the impeller and drives the impeller to rotate, the support property of the front end of the pump shaft is poor, the pump shaft is easily damaged to affect the normal rotation of the impeller, on the other hand, the impeller can have axial displacement due to different liquid pressures on both sides of the impeller during rotation, and even cause friction between the impeller and the pump body, affecting the normal operation of the pump. SUMMARY

[0003] In order to solve the problems existing in the prior art, the utility model provides a long life magnetic force pump of conveying liquid chlorine, which can meet the conveying of liquid chlorine, reduce the corrosion of liquid chlorine, and prolong the service life of the magnetic force pump.

[0004] The utility model adopts the specific technical scheme of:

[0005] A long life magnetic force pump of conveying liquid chlorine, comprising a pump body, an outer magnetic cylinder, an isolation sleeve, an inner magnet, a pump shaft and an impeller, the outer magnetic cylinder is connected with the output shaft of a motor, the isolation sleeve is arranged between the outer magnetic cylinder and the inner magnet, the inner magnet is fixedly connected with the impeller, the pump shaft is installed on the isolation sleeve, the impeller is arranged in the pump body and at the front end of the pump shaft, and the key point is that a pump body port ring is nested on the liquid inlet end of the pump body, a flexible spring sheet is arranged on the inlet of the impeller, an arc-shaped protrusion is arranged on the pump body port ring, and the flexible spring sheet is arranged adjacent to the arc-shaped protrusion.

[0006] A pump shaft mounting hole is fixedly connected to the center of the pump body port ring, and the front end of the pump shaft is suspended forward from the impeller and installed in the pump shaft mounting hole.

[0007] A bearing seat is fixedly connected to the rear end of the impeller, a bearing is arranged between the pump shaft and the bearing seat, the inner magnet is inlaid in the bearing seat, and the impeller, the bearing seat and the pump shaft are rotatably connected through the bearing.

[0008] The bottom of the isolation sleeve is inlaid with a wear-resistant layer, and a reinforcing sleeve is provided on the outside of the isolation sleeve. The pump shaft is installed in the wear-resistant layer.

[0009] The magnetic pump also includes a connecting frame connected to the pump body. The external magnetic cylinder is disposed in the cavity of the connecting frame. The connecting frame is provided with a cold air inlet and a hot air outlet. The cold air inlet is located near the motor and the hot air outlet is located near the impeller. The gap between the external magnetic cylinder and the isolation sleeve forms a cooling channel. The cold air inlet and the hot air outlet are respectively disposed on the connecting frame and communicate with the cooling channel.

[0010] The connecting frame is also provided with a cooling cavity in a ring shape along the connecting frame. The connecting frame is provided with a coolant inlet and a coolant outlet, which are respectively connected to the cooling cavity.

[0011] The outer magnetic cylinder has a hub inside its cavity. The outer magnetic cylinder is connected to the hub by a set of axial flow fan blades. The hub is connected to the output shaft of the motor. The airflow direction of the axial flow fan blades is set towards the impeller.

[0012] The movable end of the flexible spring is provided with a counterweight ring.

[0013] The beneficial effects of this utility model are:

[0014] 1. This utility model employs an impeller inlet ring on the impeller and a pump body inlet ring on the pump body. Replaceable impeller inlet rings and pump body inlet rings replace direct contact between the impeller and pump body, preventing wear between them. A flexible spring is added to the impeller inlet ring, and an arc-shaped protrusion is added to the pump body inlet ring. Under centrifugal force, the flexible spring can open and approach the arc-shaped protrusion, preventing rigid collisions between the pump body inlet ring and the impeller inlet ring and reducing the frequency of replacement. The flexible spring also maintains relatively stable sealing performance between the pump body inlet ring and the impeller inlet ring, reducing internal leakage.

[0015] 2. The pump body inlet ring 8 has a pump shaft mounting hole fixed in the center. One end of the pump shaft is installed in the pump shaft mounting hole. The pump shaft is supported and fixed by the pump body inlet ring, which improves the connection stability of the pump shaft.

[0016] 3. The impeller and bearing housing are integrated as a single unit, serving as the bearing support. The structure is compact and easy to disassemble and assemble.

[0017] 4. The addition of a reinforcing sleeve and a wear-resistant layer helps extend the service life of the isolation sleeve;

[0018] 5. The connecting frame is equipped with a cold air inlet and a hot air outlet. Cold air is blown into the connecting frame, and the cold air will blow the eddy heat out of the connecting frame, reducing the adverse effects of eddy heat on the magnetic pump.

[0019] 6. The connecting frame is also equipped with a cooling chamber for external cooling water. The flow of cooling water in the cooling chamber further reduces the impact of eddy current heat on the magnetic pump.

[0020] 7. An axial flow fan is installed on the outer magnetic cylinder. When the outer magnetic cylinder rotates, the axial flow fan pushes the air, so that the cold air passes through the outer magnetic cylinder and the isolation sleeve quickly and effectively.

[0021] 8. A counterweight ring is provided on the flexible spring sheet to increase the centrifugal force on the flexible spring sheet. The centrifugal force on the flexible spring sheet can be changed by changing the weight of the counterweight ring, thereby preventing liquid chlorine backflow while reducing wear between the flexible spring sheet and the arc-shaped protrusion. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model;

[0023] Figure 2 for Figure 1 A magnified schematic diagram of part A in the middle;

[0024] Figure 3 This is a schematic diagram of the assembly of the present invention with the motor;

[0025] In the attached diagram, 1. Pump body, 2. Outer magnetic cylinder, 3. Isolation sleeve, 4. Inner magnet, 5. Pump shaft, 6. Impeller, 7. Motor, 8. Pump body inlet ring, 9. Impeller inlet ring, 10. Arc-shaped protrusion, 11. Flexible spring, 12. Counterweight ring, 13. Pump shaft mounting hole, 14. Bearing housing, 15. Bearing, 16. Hub, 17. Axial flow fan blade, 18. Connecting frame, 19. Cold air inlet, 20. Hot air outlet, 21. Air-cooled passage, 22. Cooling chamber, 23. Coolant inlet, 24. Coolant outlet. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0027] Specific implementation examples Figure 1 , Figure 3 As shown, a long-life magnetic pump for conveying liquid chlorine includes a pump body 1, an outer magnetic cylinder 2, an isolation sleeve 3, an inner magnet 4, a pump shaft 5, and an impeller 6. The outer magnetic cylinder 2 is connected to the output shaft of a motor 7. The isolation sleeve 3 is disposed between the outer magnetic cylinder 2 and the inner magnet 4. The inner magnet 4 is fixedly connected to the impeller 6. The pump shaft 5 is mounted on the isolation sleeve 3. The impeller 6 is disposed inside the pump body 1 and at the front end of the pump shaft 5. Crucially, a pump body inlet ring 8 is nested at the liquid inlet end of the pump body 1, and an impeller inlet ring 9 is disposed at the inlet of the impeller 6. Figure 2As shown, the pump body mouth ring 8 is provided with an arc-shaped protrusion 10, and the impeller mouth ring 9 is provided with a flexible spring 11, which is arranged adjacent to the arc-shaped protrusion 10. In the shutdown state, the flexible spring 11 is arranged in a gap with the arc-shaped protrusion 10.

[0028] In the pump body 1, the inner liner is made of fluorine plastic, the pump body mouth ring 8 is made of SiC material, the material of the impeller mouth ring 9 is polytetrafluoroethylene, the material of the impeller 6 is fluorine plastic, the material of the pump shaft 5 is ceramic, and the contact surface layer of the isolation sleeve 3 with liquid chlorine is made of fluorine plastic material, which can effectively reduce the corrosion of liquid chlorine on the magnetic pump and is suitable for the transportation of liquid chlorine.

[0029] The pump body mouth ring 8 is additionally arranged on the pump body 1, and the impeller mouth ring 9 matched with the pump body mouth ring 8 is additionally arranged on the impeller 6. The pump body mouth ring 8 and the impeller mouth ring 9 are used as vulnerable parts to protect the pump body 1 and the impeller 6. When the impeller 6 moves axially, the pump body mouth ring 8 and the impeller mouth ring 9 contact and bear friction and wear, which avoids the wear between the impeller 6 and the pump body 1, effectively prolongs the service life of the magnetic pump, prevents the backflow of liquid chlorine transported by the magnetic pump, and improves the transportation efficiency.

[0030] The pump body mouth ring 8 is provided with an arc-shaped protrusion 10, and the impeller mouth ring 9 is provided with a flexible spring 11, which is arranged adjacent to the arc-shaped protrusion 10. In the shutdown state, the flexible spring 11 is arranged in a gap with the arc-shaped protrusion 10. When the impeller 6 rotates, the flexible spring 11 is opened close to the arc-shaped protrusion 10 under the action of centrifugal force. The flexible spring 11 absorbs the vibration generated by the sudden rotation of the impeller, avoids the rigid collision between the pump body mouth ring 8 and the impeller mouth ring 9, reduces the replacement frequency of the pump body mouth ring 8 and the impeller mouth ring 9, and prolongs the service life. On the other hand, due to the influence of thermal expansion and cold contraction during work, the gap between the pump body mouth ring 8 and the impeller mouth ring 9 changes. The arrangement of the flexible spring 11 can compensate for the change of the gap, keep the sealing performance between the pump body mouth ring 8 and the impeller mouth ring 9 relatively stable, and reduce internal leakage.

[0031] The pump shaft mounting hole 13 is fixedly connected to the center of the pump body mouth ring 8. The front end of the pump shaft 5 is suspended forward from the impeller 6 and is mounted in the pump shaft mounting hole 13. The end of the pump shaft 5 is supported and fixed by the pump body mouth ring 8, which can significantly improve the connection stability of the pump shaft 5 and help the smooth rotation of the impeller 6.

[0032] The rear end of the impeller 6 is fixedly connected with the bearing seat 14. The bearing 15 is arranged between the pump shaft 5 and the bearing seat 14. The inner magnet 4 is embedded in the bearing seat 14. The impeller 6 and the bearing seat 14 are rotatably connected with the pump shaft 5 through the bearing 15. The impeller 6 and the bearing seat 14 are made of fluorine plastic material and are integrally formed between them. The impeller 6 not only serves as a flow-through rotor component for transporting medium, but also serves as a support seat for the bearing 15 together with the bearing seat 14. The structure is more compact and convenient to disassemble and assemble.

[0033] The body of the isolation sleeve 3 is made of fluoroplastic material, and the outer side of the isolation sleeve 3 is provided with a reinforcing sleeve made of non-metallic mixed material by injection molding. The reinforcing sleeve is made of carbon fiber reinforced plastic, which enhances the strength and wear resistance of the isolation sleeve 3, eliminates magnetic eddy current loss, and prolongs the service life of the isolation sleeve 3. The bottom of the isolation sleeve 3 is embedded with a wear-resistant layer made of SiC, and one end of the pump shaft 5 is installed in matching with the wear-resistant layer. The wear-resistant layer not only enhances the wear resistance of the isolation sleeve 3, but also improves the strength and rigidity of the isolation sleeve 3, further prolonging the service life of the isolation sleeve 3.

[0034] Further, the magnetic drive pump further comprises a connecting frame 18 connected with the pump body 1, the outer magnetic cylinder 2 is arranged in the cavity of the connecting frame 18, and the connecting frame 18 is provided with a cold air inlet 19 and a hot air outlet 20. The cold air inlet 19 is arranged close to the motor 7, and the hot air outlet 20 is arranged close to the impeller 6. The gap between the outer magnetic cylinder 2 and the isolation sleeve 3 forms an air cooling channel 21. The cold air inlet 19 and the hot air outlet 20 are arranged on the connecting frame 18 and communicate with the air cooling channel 21, respectively. During operation, cold air is blown into the cavity of the connecting frame 18 through the cold air inlet 19. The cold air carries away the eddy current heat generated by the rotation of the outer magnetic cylinder after passing through the outer magnetic cylinder and the isolation sleeve, and the eddy current heat is discharged out of the magnetic drive pump through the hot air outlet 20, thereby eliminating the influence of the eddy current heat on the working performance of the magnetic drive pump.

[0035] Further, the connecting frame 18 is further provided with a cooling cavity 22 in a ring-like structure along the connecting frame 18. The connecting frame 18 is provided with a cooling liquid inlet 23 and a cooling liquid outlet 24, respectively. The cooling liquid inlet 23 and the cooling liquid outlet 24 communicate with the cooling cavity 22, respectively. Cooling water is added into the cooling cavity 22 through the cooling liquid inlet 23, and the cooling water is discharged through the cooling liquid outlet 24. Through the circulation of the cooling water in the cooling cavity 22, the heat dissipation effect in the cavity of the connecting frame 18 is improved, the influence of heat on the transmission efficiency of the magnetic drive pump is further reduced, the demagnetization phenomenon of the inner magnet 4 is avoided, and the service life of the inner magnet 4 is improved.

[0036] Further, the cavity of the outer magnetic cylinder 2 is provided with a hub 16, and the outer magnetic cylinder 2 is connected with the hub 16 by means of a group of axial flow blades 17. The hub 16 is connected with the output shaft of the motor 7, and the direction of the axial flow blades 17 is arranged towards the impeller 6. When the outer magnetic cylinder 2 rotates, the axial flow blades 17 push the cold air to move in the direction of the impeller 6, so that the flow rate of the cold air in the air cooling channel 21 is accelerated. The cold air can effectively carry away the eddy current heat out of the connecting frame 18, thereby improving the heat exchange efficiency.

[0037] Preferably, the flexible spring 11 is provided with a counterweight ring 12 at the movable end. In operation, the pressure at the outlet of the impeller is higher than that at the inlet, and the liquid chlorine flows back from the outlet to the inlet along the gap between the impeller ring and the pump body ring, and the backflow of the liquid chlorine generates a counterforce on the flexible spring 11 which is opened under the centrifugal force, and the centrifugal force and the backflow of the liquid chlorine jointly act on the flexible spring 11, and the counterweight ring 12 adjusts the centrifugal force on the flexible spring 11, so that the gap between the flexible spring 11 and the arc-shaped protrusion 10 is balanced, and the backflow of the liquid chlorine is prevented while the wear between the flexible spring 11 and the arc-shaped protrusion 10 is reduced.

Claims

1. A long-life magnetic pump for conveying liquid chlorine, comprising a pump body (1), an outer magnetic cylinder (2), an isolation sleeve (3), an inner magnet (4), a pump shaft (5), and an impeller (6), wherein the outer magnetic cylinder (2) is connected to the output shaft of a motor (7), the isolation sleeve (3) is disposed between the outer magnetic cylinder (2) and the inner magnet (4), the inner magnet (4) is fixedly connected to the impeller (6), the pump shaft (5) is mounted on the isolation sleeve (3), and the impeller (6) is disposed inside the pump body (1) and at the front end of the pump shaft (5), characterized in that: The pump body (1) is nested with a pump body port ring (8), the impeller (6) is provided with an impeller port ring (9) at the inlet, the pump body port ring (8) is provided with an arc-shaped protrusion (10), the impeller port ring (9) is provided with a flexible spring piece (11), and the flexible spring piece (11) is arranged adjacent to the arc-shaped protrusion (10).

2. A long-life magnetic pump for delivering liquid chlorine according to claim 1, characterized in that: The center of the pump body port ring (8) is fixedly connected with a pump shaft mounting hole (13), and the front end of the pump shaft (5) is suspended forwardly by the impeller (6) and is mounted in the pump shaft mounting hole (13).

3. A long-life magnetic pump for delivering liquid chlorine according to claim 1, characterized in that: The rear end of the impeller (6) is fixedly connected with a bearing seat (14), the pump shaft (5) and the bearing seat (14) are provided with a bearing (15) therebetween, the inner magnet (4) is inlaid in the bearing seat (14), and the impeller (6), the bearing seat (14) and the pump shaft (5) are rotatably connected through the bearing (15).

4. A long-life magnetic pump for pumping liquid chlorine according to claim 1, characterized in that: The bottom of the isolation sleeve (3) is inlaid with a wear-resistant layer, the outer side of the isolation sleeve (3) is provided with a reinforcing sleeve, and the pump shaft (5) is mounted in the wear-resistant layer.

5. A long-life magnetic pump for pumping liquid chlorine according to claim 1, characterized in that: The magnetic drive pump further comprises a connecting frame (18) connected with the pump body (1), the outer magnetic cylinder (2) is arranged in the cavity of the connecting frame (18), the connecting frame (18) is provided with a cold air inlet (19) and a hot air outlet (20), the cold air inlet (19) is arranged close to the motor (7), the hot air outlet (20) is arranged close to the impeller (6), the gap between the outer magnetic cylinder (2) and the isolation sleeve (3) forms an air cooling channel (21), and the cold air inlet (19) and the hot air outlet (20) are arranged on the connecting frame (18) and are in communication with the air cooling channel (21).

6. A long-life magnetic pump for pumping liquid chlorine according to claim 5, characterized in that: The connecting frame (18) is further provided with a cooling cavity (22) in a ring structure along the connecting frame (18), and the connecting frame (18) is respectively provided with a cooling liquid inlet (23) and a cooling liquid outlet (24), and the cooling liquid inlet (23) and the cooling liquid outlet (24) are respectively in communication with the cooling cavity (22).

7. A long-life magnetic pump for pumping liquid chlorine according to claim 5, characterized in that: The cavity of the outer magnetic cylinder (2) is provided with a hub (16), the outer magnetic cylinder (2) is connected with the hub (16) through a group of axial flow blades (17), the hub (16) is connected with the output shaft of the motor (7), and the axial flow blades (17) are arranged in a direction towards the impeller (6).

8. A long-life magnetic pump for pumping liquid chlorine according to claim 1, characterized in that: The movable end of the flexible spring piece (11) is provided with a counterweight ring (12).

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