Magnetic drive pump for conveying media easy to polymerize

Abstract

The utility model relates to a magnetic drive pump for conveying media easy to polymerize. The magnetic drive pump comprises a pump body, a magnetic cylinder assembly and a motor. The pump body and the motor are arranged at the two ends of the magnetic cylinder assembly respectively. A pump inlet is formed in the end, away from the magnetic cylinder assembly, of the pump body. An impeller is arranged in the pump body; the impeller is arranged on the pump shaft; an opening is formed in one side, close to the pump inlet, of the impeller; a balance disc is arranged on the side, away from the pump inlet, of the impeller. The utility model has the advantages of reasonable design and simple structure, is not easy to block, and eliminates the backward axial force of the rotating part.

Description

Technical Field

[0001] The utility model relates to the technical field of magnetic pumps, in particular to a magnetic pump for conveying easily polymerizable media. Background Art

[0002] The magnetic pump is a centrifugal pump driven by a motor through a coupling. The magnetic force of the drive assembly drives the internal magnetic rotor assembly and the pump shaft to rotate, and drives the impeller at the end of the pump shaft to rotate. The internal and external magnetic non-contact torque transmission method replaces the dynamic seal with a static seal to achieve the purpose of leak-free pump transportation. At present, most of the leak-free pumps in the petroleum and chemical fields are shielded pumps or magnetic pumps. When the magnetic pump transports easily polymerizable substances, conventional magnetic pumps are prone to clogging and cannot meet the requirements. The use of semi-open impellers is particularly suitable for working conditions containing flocs. When using semi-open impellers, it is difficult to balance the axial force to zero using conventional wear-resistant rings or back blades. Utility Model Content

[0003] The utility model mainly solves the technical problems of the prior art such as the difficulty in balancing the axial force, and proposes a magnetic pump for conveying easily polymerized media. The utility model has a reasonable design and a simple structure, and overcomes the difficulty that the conventional wear-resistant ring or back blade type cannot completely balance the axial force. The utility model can ensure no leakage, adapt to conveying special media that are easily polymerized, and has reliable operation.

[0004] The utility model provides a magnetic pump for conveying easily polymerizable media, comprising: a pump body, a magnetic cylinder assembly and a motor; the pump body and the motor are respectively arranged at two ends of the magnetic cylinder assembly;

[0005] A pump inlet is arranged at one end of the pump body away from the magnetic cylinder assembly; an impeller is arranged in the pump body; and the impeller is arranged on the pump shaft;

[0006] An opening is arranged on the side of the impeller close to the pump inlet; and a balancing disk is arranged on the side of the impeller away from the pump inlet.

[0007] Furthermore, a wear-resistant plate is arranged inside the pump body on one side close to the magnetic cylinder assembly; and the wear-resistant plate is connected to the magnetic cylinder assembly on the side facing away from the pump body.

[0008] Furthermore, a wear-resistant plate ring is arranged between the balancing disc and the wear-resistant plate.

[0009] Furthermore, there is a first gap between the impeller cover plate and the wear-resistant plate ring; and there is a second gap between the wear-resistant plate ring and the balance disk.

[0010] Furthermore, the inner diameter of the first gap is 0.2-0.3 mm.

[0011] Furthermore, the motor is arranged at the end of the magnetic cylinder assembly through a coupling; the output end of the motor is transmission-connected to the rotating shaft of the magnetic pump through the coupling.

[0012] Further, a circulation hole is provided on the side surface of the pump shaft; one end of the circulation hole communicates with the inner hole of the pump shaft; the other end of the circulation hole communicates with the first gap.

[0013] Further, the magnetic cylinder assembly includes: an inner magnetic rotor assembly and an outer magnetic drive assembly; an isolation sleeve is provided between the inner magnetic rotor assembly and the outer magnetic drive assembly.

[0014] Further, the balance disk is made of steel.

[0015] Compared with the prior art, the magnetic pump for transporting easily polymerizable media provided by the present utility model has the following advantages:

[0016] 1. The impeller without a front cover plate is adopted in the present utility model, so that impurities such as polymers and flocs in the medium can be smoothly discharged from the pump outlet and are not easily blocked.

[0017] 2. The balance disk is adopted in the present utility model. The balance disk makes the axial force borne by the rotating components (i.e., all parts installed on the shaft) tend to zero through the cooperation with the inner hole of the pump shaft. During operation, when the pressure in the pump cavity is large, the rotating components of the pump will bear a large axial force to the right. When the circulating liquid flow pushes the balance disk 3 to move slightly to the right, the second gap between the balance disk ring 3 and the wear-resistant plate ring 2 increases, and the liquid flow passing through the balance disk ring 3 and the wear-resistant plate ring 4 increases, increasing the pressure on the right side of the balance disk ring 3 and the impeller 5, and then eliminating the axial force of the rotating components backward. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of a magnetic pump for transporting easily polymerizable media according to the present utility model;

[0019] Reference numerals: 1. First fixing screw, 2. Wear-resistant plate ring, 3. Balance disk ring, 4. Second fixing screw, 5. Semi-open impeller, 6. Wear-resistant plate, 7. Impeller nut, 8. Pump inlet, 9. Circulation hole, 10. Motor, 11. Coupling, 12. Rotor assembly, 13. Drive assembly, 14. Pump shaft, 15. Pump outlet. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] To make the technical problems solved, the technical solutions adopted, and the technical effects achieved by the present utility model clearer, the present utility model will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the convenience of description, only some parts related to the present utility model are shown in the drawings instead of all the content.

[0021] As Figure 1As shown, the magnetic pump for conveying easily polymerizable media provided by the embodiment of the utility model comprises: a pump body, a magnetic cylinder assembly and a motor 10; the pump body and the motor 10 are respectively arranged at both ends of the magnetic cylinder assembly;

[0022] A pump inlet 8 is provided at one end of the pump body away from the magnetic cylinder assembly; an impeller 5 is provided in the pump body; and the impeller 5 is provided on a pump shaft 14;

[0023] The impeller 5 is provided with an opening on the side close to the pump inlet 8; the impeller 5 is provided with a cover plate on the side away from the pump inlet 8, and the front side is open without a front cover plate; the semi-open impeller enables impurities such as polymers and floccules in the medium to be smoothly transported from the pump inlet 8 to the pump outlet 15;

[0024] A cover plate is provided on the side of the impeller 5 away from the pump inlet 8; a balancing plate 3 is provided on the side of the cover plate away from the impeller 5. The balancing plate 3 is directly mounted on the impeller through the second fixing screw 4, and has a simple structure. A wear-resistant plate ring 2 is provided between the balancing plate 3 and the wear-resistant plate 6. The wear-resistant plate ring 2 is mounted on the wear-resistant plate 6 through the first fixing screw 1.

[0025] The magnetic pump of the utility model is driven by a motor 10 through a coupling 11 to drive a driving assembly 13, and the driving assembly 13 magnetically drives an inner magnetic rotor assembly 12 and a pump shaft 14 to rotate, thereby driving an impeller 5 at the end of the pump shaft to rotate.

[0026] A wear-resistant plate 6 is arranged inside the pump body near the magnetic cylinder assembly; the wear-resistant plate 6 is connected to the magnetic cylinder assembly on the side facing away from the pump body. A first gap is provided between the impeller 5 cover plate and the wear-resistant plate ring 2; a second gap is provided between the wear-resistant plate ring 2 and the balance disk 3. The magnetic cylinder assembly includes: an inner magnetic rotor assembly 12 and an outer magnetic drive assembly 13; an isolation sleeve is provided between the inner magnetic rotor assembly 12 and the outer magnetic drive assembly 13.

[0027] The inner diameter of the first gap is 0.25 mm. The second gap changes with the axial force; when the rotating part of the pump is subjected to a larger rightward axial force, the second gap becomes larger, and when the rotating part of the pump is subjected to a larger leftward axial force, the second gap becomes smaller.

[0028] The motor 10 is arranged at the end of the magnetic cylinder assembly through a coupling 11; the output end of the motor 10 is connected to the rotating shaft of the magnetic pump through the coupling 11. A circulation hole 9 is arranged on the side of the pump shaft; one end of the circulation hole 9 is connected to the inner hole of the pump shaft; the other end of the circulation hole 9 is connected to the first gap.

[0029] When the transmitted medium is corrosive, the balancing disc can be made of stainless steel of standard 1.4462. When the transmitted medium is not corrosive, the balancing disc can be made of HT250 (grey cast iron).

[0030] The circulation route of the circulating liquid of the present utility model is as follows: The high-pressure circulating liquid flow at the outlet of the impeller passes through the first gap between the impeller 5 and the wear-resistant plate ring 2, then through the second gap between the wear-resistant plate ring 2 and the balance disc ring 3, reaches the low-pressure area between the impeller 5 and the wear-resistant plate 6, and then returns to the low-pressure area of the impeller nut 7 through the circulation hole 9 and the inner hole of the pump shaft 14. The liquid of the balance disc flows back to the impeller nut 7 through the circulation hole 9 and the inner hole of the pump shaft 14, and the ability to balance the axial force is stronger.

[0031] The working principle of the present utility model: During operation, when the pressure in the pump cavity is relatively large, the rotating components of the pump will bear a relatively large axial force to the right. When the circulating liquid flow pushes the balance disc 3 to move slightly to the right, the second gap between the balance disc 3 and the wear-resistant plate ring 2 increases, and the liquid flow through the balance disc ring 3 and the wear-resistant plate ring 4 increases, increasing the pressure on the right side of the balance disc ring 3 and the impeller 5, and then eliminating the axial force of the rotating components backward.

[0032] During operation, when the pressure on the right side of the balance disc ring 3 and the impeller 5 is large, it pushes the pump balance disc ring 3 to move slightly to the left, reducing the second gap between the balance disc ring 3 and the wear-resistant plate ring 2, and the liquid flow through the balance disc ring 3 and the wear-resistant plate ring 2 decreases, reducing the pressure on the right side of the balance disc ring 3 and the impeller 5, and eliminating the axial force of the rotating components forward.

[0033] The liquid flow through the balance disc returns to the impeller nut 7 through the circulation hole 9 and the inner hole of the pump shaft 14. The pressure in front of the impeller nut 7 is lower than that at the position of the conventional balance hole, making the pressure difference between the two sides of the balance disc larger, and the ability to balance the axial force stronger. It can automatically balance the axial force of the rotating components of the pump, with a simple structure, flexible and reliable operation, ensuring the normal operation of the pump and extending its service life.

[0034] Finally, it should be noted that: The above embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit it; Although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: Modifying the technical solutions recorded in the foregoing embodiments, or equivalently replacing some or all of the technical features therein, does not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present utility model.

Claims

1. A magnetic pump for transporting easily polymerizable media, characterized in that, Comprising: A pump body, a magnetic cylinder assembly, and a motor (10); the pump body and the motor (10) are respectively arranged at both ends of the magnetic cylinder assembly; One end of the pump body away from the magnetic cylinder assembly is provided with a pump inlet (8); an impeller (5) is arranged inside the pump body; the impeller (5) is arranged on a pump shaft (14); An opening is arranged on one side of the impeller (5) close to the pump inlet (8); a balance disk (3) is arranged on the side of the impeller (5) facing away from the pump inlet (8).

2. The magnetic pump for transporting easily polymerizable media according to claim 1, wherein A wear-resistant plate (6) is arranged inside the pump body close to the magnetic cylinder assembly; the side of the wear-resistant plate (6) facing away from the pump body is connected to the magnetic cylinder assembly.

3. The magnetic pump for transporting easily polymerizable medium according to claim 1, characterized in that, A wear-resistant plate ring (2) is arranged between the balance disk (3) and the wear-resistant plate (6).

4. The magnetic pump for transporting easily polymerizable medium according to claim 3, characterized in that, There is a first gap between the cover plate of the impeller (5) and the wear-resistant plate ring (2); there is a second gap between the wear-resistant plate ring (2) and the balance disk (3).

5. The magnetic pump for transporting easily polymerizable media according to claim 4, characterized in that, The inner diameter of the first gap is: 0.2 - 0.3 mm.

6. The magnetic force pump for transporting easily polymerizable media according to claim 1, characterized in that The motor (10) is arranged at the end of the magnetic cylinder assembly through a coupling (11); the output end of the motor (10) is in transmission connection with the rotating shaft of the magnetic force pump through the coupling (11).

7. The magnetic pump for transporting easily polymerizable media according to claim 6, characterized in that, A circulation hole (9) is arranged on the side of the pump shaft; one end of the circulation hole (9) is communicated with the inner hole of the pump shaft; the other end of the circulation hole (9) is communicated with the first gap.

8. The magnetic pump for transporting easily polymerizable media according to claim 1, characterized in that, The magnetic cylinder assembly includes: an inner magnetic rotor assembly (12) and an outer magnetic drive assembly (13); an isolation sleeve is arranged between the inner magnetic rotor assembly (12) and the outer magnetic drive assembly (13).

9. The magnetic pump for conveying easily polymerizable medium according to claim 1, characterized in that, The balance disk is made of steel.

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