Vertical shield pump with double inlets and double outlets

Abstract

The utility model relates to the technical field of shield pumps, and provides a vertical shield pump with double inlets and double outlets, which comprises a lower pump head unit, a shield motor unit and an upper pump head unit which are sequentially arranged from bottom to top, the lower surface pump head unit comprises a suction end cover, a lower surface pump body, a plurality of first impellers, a plurality of guide vanes and a plurality of pump middle section shells; the suction end cover is provided with a first inlet, and the suction end cover is fixedly connected with the first pump middle section shell; the last pump middle section shell is fixedly connected with the lower pump body; the lower surface pump body is provided with a first outlet; a first impeller and a guide vane are arranged in each pump middle section shell; the first impeller is fixed on the pump shaft; an arc groove is formed between the first impeller and the pump shaft. The shield pump is provided with the two inlets and the two outlets, the same shield pump can convey two different media at the same time, the conveying efficiency is high, use is convenient, and the equipment cost is low; and a medium with a larger range of viscosity can be conveyed.

Description

Technical Field

[0001] The utility model relates to the technical field of shielded pumps, in particular to a vertical shielded pump with double inlets and double outlets. Background Art

[0002] The canned pump connects the pump and the motor together. The motor rotor and the pump impeller are fixed on the same shaft. The motor rotor and the stator are separated by a shielding sleeve. The rotor rotates in the medium being transported, and its power is transmitted to the rotor through the stator magnetic field. The canned pump is lubricated by the medium it transports and has only static seals but no dynamic seals. It successfully solves the problems of running, bubbling, dripping, and leaking, and is safe and leak-free. It is widely used in chemical, petrochemical, nuclear power, medicine, refrigeration and other fields.

[0003] Many industries require two media to be mixed in proportion during product manufacturing. The two media may have different characteristics such as flow rate, head, viscosity, etc. The existing canned pump has one inlet and one outlet. When the two media are mixed in proportion, two canned pumps are required for transportation, which is inconvenient to use, has high equipment cost and low efficiency.

[0004] In addition, the shielded pumps in the prior art mostly adopt horizontal shielded pumps, and the rotating parts of the horizontal shielded pumps are supported by a pair of sliding bearings. If the viscosity of the conveying medium is large, the rotating parts are suspended in the medium when the shielded pump is running. Therefore, the weight of the entire rotating parts is supported by the liquid film at the sliding bearings. The supporting force of the liquid film is greatly affected by the viscosity of the medium. The smaller the viscosity, the smaller the supporting force. If the supporting force is less than the weight of the rotating parts, the bearings will wear and the pump will be damaged. Utility Model Content

[0005] The utility model mainly solves the current technical problem that when two media with different flow rates, heads, viscosities and other characteristics need to be mixed in proportion during the product manufacturing process, two different shielded pumps are needed for transportation. A vertical shielded pump with double inlets and double outlets is proposed. The utility model has double inlets and double outlets, so that the same shielded pump can transport two different media at the same time, with high transportation efficiency, easy use and low equipment cost; and can transport media with a wider range of viscosities.

[0006] The utility model provides a vertical canned pump with double inlets and double outlets, comprising: a lower pump head unit, a canned motor unit and an upper pump head unit which are arranged in sequence from bottom to top;

[0007] The lower pump head unit, the shielded motor unit and the upper pump head unit share a pump shaft;

[0008] The lower pump head unit comprises: a suction end cover, a lower pump body, a plurality of first impellers, a plurality of guide vanes and a plurality of pump middle section casings;

[0009] The suction end cover has a first inlet, and the suction end cover is fixedly connected to the first pump middle section housing; the last pump middle section housing is fixedly connected to the lower pump body; the lower pump body has a first outlet;

[0010] A first impeller and a guide vane are arranged inside the middle section housing of each pump; the first impeller is fixed on the pump shaft; and an arc groove is provided between the first impeller and the pump shaft;

[0011] The upper pump head unit comprises: an upper pump body and a second impeller;

[0012] The upper pump body has a second inlet and a second outlet, and a second impeller is arranged in the upper pump body.

[0013] Preferably, the lower pump head unit further comprises: a balance ring, a wear-resistant ring and a front bearing body;

[0014] A front bearing body is installed inside the lower pump body;

[0015] A balance ring is installed on the front bearing body;

[0016] The last axial force balancing impeller is equipped with a wear ring;

[0017] A circulation groove is provided on the front bearing body.

[0018] Preferably, an axial force balancing impeller is arranged inside the lower pump body;

[0019] An arc groove is provided between the axial force balancing impeller and the pump shaft.

[0020] Preferably, the lower pump head unit further comprises: a pump head threading rod;

[0021] The pump head through-bar is installed between the suction end cover and the shielded motor unit.

[0022] Preferably, the shielded motor unit comprises: a stator assembly and a rotor;

[0023] The stator assembly comprises: a motor housing front cover, a motor housing, a stator and a motor housing rear cover;

[0024] The motor housing front cover and the motor housing rear cover are installed at two ends of the motor housing, and the stator is arranged inside the motor housing;

[0025] A rotor is arranged inside the stator, and the rotor is mounted on the pump shaft.

[0026] Preferably, a stator shielding sleeve is embedded inside the stator;

[0027] The stator shielding sleeve is welded to the front cover of the motor housing and the rear cover of the motor housing respectively.

[0028] Preferably, the outer circumference of the rotor is inlaid with a rotor shielding sleeve, and both ends of the rotor are inlaid with rotor shielding plates respectively;

[0029] The rotor shielding sleeve is welded to the rotor shielding plate, and the rotor shielding plate is welded to the pump shaft;

[0030] There is a gap between the rotor shielding sleeve and the stator shielding sleeve.

[0031] Preferably, the upper pump head unit further comprises: a rear bearing body, a throttle sleeve and a stud;

[0032] The rear bearing body is located in the upper pump body and is installed on the pump shaft, and a circulation hole is opened on the rear bearing body;

[0033] A throttling sleeve is arranged between the rear bearing body and the pump shaft;

[0034] The upper pump body is connected to the shielded motor unit via studs.

[0035] Preferably, the upper pump body is a single-stage pump body, and the second impeller is a single-stage impeller.

[0036] Preferably, a circulation hole is opened on the pump shaft.

[0037] The utility model provides a vertical shielded pump with double inlets and double outlets, which is provided with a lower pump head unit, a shielded motor unit and an upper pump head unit. The lower pump head unit and the upper pump head unit have independent inlets and outlets respectively, and have double inlets and double outlets, so that the same shielded pump can simultaneously transport two different media, with high transport efficiency, convenient and reliable use, and low equipment cost. The lower pump head unit is provided with a balance ring to balance the axial force, and the lower pump head unit provides power for cooling the shielded motor to separate liquid. The utility model adopts a vertical structure, which can avoid the horizontal structure sliding bearing being affected by liquid films of different viscosities, can transport media with a wider range of viscosities, and is applicable to a wide range of viscosities. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a structural schematic diagram of a vertical canned motor pump with double inlets and double outlets provided by the utility model;

[0039] Figure 2 It is a structural schematic diagram of the following pump head unit provided by the utility model.

[0040] Figure numerals: 1. suction end cover; 2. first impeller; 3. pump middle section casing; 4. pump head through bar; 5. lower pump body; 6. motor housing front cover; 7. rotor shielding plate; 8. motor housing; 9. stator; 10. motor through bar; 11. guide vane; 12. axial force balancing impeller; 13. balance ring; 14. wear-resistant ring; 15. front bearing body; 16. first sliding bearing; 17. pump shaft; 18. rotor; 19. rotor shielding sleeve; 20. stator shielding sleeve; 21. second sliding bearing; 22. motor housing rear cover; 23. upper pump body; 24. second impeller; 25. rear bearing body; 26. throttle sleeve; 27. stud. DETAILED DESCRIPTION

[0041] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for the sake of ease of description, only the parts related to the present invention are shown in the accompanying drawings, rather than all of the contents.

[0042] like Figure 1 As shown, the vertical canned pump with double inlets and double outlets provided by the embodiment of the utility model includes: a lower pump head unit, a canned motor unit and an upper pump head unit arranged in sequence from bottom to top.

[0043] The lower pump head unit, the shielded motor unit and the upper pump head unit share a pump shaft 17; one end of the shielded motor unit is connected to the lower pump head unit, and the other end is connected to the upper pump head unit. The pump shaft 17 is provided with a circulation hole.

[0044] like Figure 2 As shown, the lower pump head unit includes: a suction end cover 1, a lower pump body 5, a plurality of first impellers 2, a plurality of guide vanes 11 and a plurality of pump middle section casings 3.

[0045] The suction end cover 1 has a first inlet, and the suction end cover 1 is fixedly connected to the first pump middle section housing 3; the last pump middle section housing 3 is fixedly connected to the lower pump body 5; the lower pump body 5 has a first outlet.

[0046] A first impeller 2 and a guide vane 11 are arranged inside each pump middle section housing 3; the first impeller 2 is fixed on the pump shaft 17; an arc groove is provided between the first impeller 2 and the pump shaft 17; an axial force balancing impeller 12 is arranged inside the lower pump body 5; an arc groove is provided between the axial force balancing impeller 12 and the pump shaft 17. In the utility model, a guide vane 11 is installed inside each pump middle section housing 3 and is correspondingly arranged outside each first impeller 2; the first impeller 2 is installed on the pump shaft 17.

[0047] The lower pump head unit also includes: a balance ring 13, a wear ring 14 and a front bearing body 15; the front bearing body 15 is installed inside the lower pump body 5; the balance ring 13 is installed on the front bearing body 15; the last axial force balancing impeller 12 is installed with a wear ring 14; the front bearing body 15 is provided with a circulation groove, and the number and size of the circulation holes are determined according to the circulation amount of the shielded motor. The front bearing body 15 is fixedly connected to the front cover 6 of the motor housing of the shielded motor unit.

[0048] The lower pump head unit further comprises: a pump head through bar 4; the pump head through bar 4 is installed between the suction end cover 1 and the shielded motor unit. Specifically, the suction end cover 1 is connected to the motor housing front cover 6 of the shielded motor unit through the pump head through bar 4.

[0049] The shielded motor unit includes: a stator assembly and a rotor 18; the stator assembly includes: a motor housing front cover 6, a motor housing 8, a stator 9 and a motor housing rear cover 22; the motor housing front cover 6 and the motor housing rear cover 22 are installed at both ends of the motor housing 8, and the stator 9 is arranged inside the motor housing 8; the rotor 18 is arranged inside the stator 9, and the rotor 18 is installed on the pump shaft 17.

[0050] The stator 9 is internally mounted with a stator shielding sleeve 20; the stator shielding sleeve 20 is respectively welded to the motor housing front cover 6 and the motor housing rear cover 22, specifically by argon arc welding, to ensure that the stator assembly of the shielded motor unit is isolated from the conveying medium. The various components of the stator assembly are tightly connected by the motor through rod 10.

[0051] The outer circumference of the rotor 18 is inlaid with a rotor shielding sleeve 19, and both ends of the rotor 18 are inlaid with rotor shielding plates 7 respectively; the rotor shielding sleeve 19 is welded to the rotor shielding plate 7, and the rotor shielding plate 7 is welded to the pump shaft 17, specifically by argon arc welding, to ensure that the rotor 18 is completely isolated from the conveying medium. There is a gap between the rotor shielding sleeve 19 and the stator shielding sleeve 20.

[0052] The shielded motor unit is internally installed with a first sliding bearing 16 and a second sliding bearing 21 ; the first sliding bearing 16 and the second sliding bearing 21 are arranged on the pump shaft 17 and are fixedly connected to the front bearing body 15 and the rear bearing body 25 , respectively.

[0053] In addition, a junction box is provided on the shielded motor unit, and the junction box is connected to the lead wires of the coil wound on the stator 9.

[0054] The upper pump head unit comprises: an upper pump body 23 and a second impeller 24; the upper pump body 23 has a second inlet and a second outlet, and the second impeller 24 is arranged in the upper pump body 23. The upper pump body 23 is a single-stage pump body, and the second impeller 24 is a single-stage impeller.

[0055] The upper pump head unit also includes: a rear bearing body 25, a throttling sleeve 26 and a stud 27; the rear bearing body 25 is located in the upper pump body 23 and is installed on the pump shaft 17, and the rear bearing body 25 is provided with circulation holes, and the number and size of the circulation holes are determined according to the circulation volume of the shielded motor. A throttling sleeve 26 is arranged between the rear bearing body 25 and the pump shaft 17; the upper pump body 23 is connected to the shielded motor unit through the stud 27 to fix the upper pump head unit.

[0056] The specific working process of the utility model is as follows: In order to transport a wide range of medium viscosity, the shielded pump of the utility model is a vertical structure. The weight of the rotor of the vertical structure is not supported by the liquid film of the sliding bearing. The shielded pump only needs to balance the axial force, so it is not affected by the viscosity of the medium and can be applied to a wide range of medium viscosity. The axial force balance is achieved as follows: most of the transported medium is pressurized step by step through the multi-stage impeller mechanism of the pump head unit below and discharged from the outlet, and a part of the transported medium passes through the circulation groove of the front bearing body 15 and enters the gap between the stator shielding sleeve 20 and the rotor shielding sleeve 19 of the shielded motor unit to cool the shielded motor, and then passes through the circulation hole on the rear bearing body 25, passes through the circulation hole on the pump shaft 17, and merges with most of the transported medium through the circulation hole behind the second-to-last first impeller 2 that is connected to the shaft hole and enters the inlet of the last-stage axial force balancing impeller 12. This part of the medium has an upward thrust on the lower end face of the rotor 18 to balance a part of the downward axial force. The main method of balancing the axial force is as follows: a wear ring 14 is installed on the last stage axial force balancing impeller 12, a balance ring 13 is installed on the front bearing body 15, there is a gap between the balance ring 13 and the last stage axial force balancing impeller 12, the front of the balance ring 13 is a high-pressure chamber, the rear pressure chamber of the wear ring 14 is connected to the first impeller 2, the groove on the inner hole of the axial force balancing impeller 12 and the circulation channel formed by the pump shaft 17 are connected to the entrance of the second stage first impeller 2, and the axial force is dynamically adjusted by the pressure difference between the pressure chamber in front of the balance ring 13 and the pressure chamber in the rear of the wear ring 14. In addition, the pressure difference caused by the different pressures on the front and rear cover plates of the single-stage second impeller 24 in the above pump head unit also helps to adjust the axial force at the same time, so that the axial force of the entire pump is completely balanced. The double inlet and double outlet are realized as follows: a separate inlet is arranged on the suction end cover 1 of the lower pump head unit, a separate outlet is arranged on the multi-stage pump body 5, and a separate inlet and outlet are also arranged on the upper pump body 23 of the single-stage upper pump head unit. The inlet and outlet of the lower pump head unit and the upper pump head unit are connected to pipelines respectively, and different media can be conveyed by passing different media at the same time.

[0057] The utility model has a vertical canned pump with double inlets and double outlets, and the lower pump head unit and the upper pump head unit are respectively located at the two ends of the canned motor unit; the lower pump head unit and the upper pump head unit have independent inlets and outlets respectively. A multi-stage first impeller 2 and an axial force balancing impeller 12 are installed below the pump shaft 17, and a single-stage second impeller 24 is installed above. The rotor cavity of the canned motor unit is filled with conveying medium, and the stator assembly of the canned motor is isolated from the conveying medium by the stator shielding sleeve 20, and the inside of the stator shielding sleeve 20 is filled with conveying medium. The utility model has a vertical canned pump with double inlets and double outlets, and has two inlets and two outlets, and the two inlets and two outlets are respectively located at the upper and lower sides of the canned pump, and the conveying viscosity range is large.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that modifying the technical solutions recorded in the aforementioned embodiments, or replacing part or all of the technical features therein by equivalents, does not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A vertical canned motor pump with double inlet and double outlet, It is characterized in that include: A lower pump head unit, a shielded motor unit and an upper pump head unit are arranged in sequence from bottom to top; The lower pump head unit, the shielded motor unit and the upper pump head unit share a pump shaft (17); The lower pump head unit comprises: a suction end cover (1), a lower pump body (5), a plurality of first impellers (2), a plurality of guide vanes (11) and a plurality of pump middle section casings (3); The suction end cover (1) has a first inlet, and the suction end cover (1) is fixedly connected to the first pump middle section housing (3); the last pump middle section housing (3) is fixedly connected to the lower pump body (5); the lower pump body (5) has a first outlet; A first impeller (2) and a guide vane (11) are arranged inside each pump middle section casing (3); the first impeller (2) is fixed on a pump shaft (17); and an arc groove is provided between the first impeller (2) and the pump shaft (17); The upper pump head unit comprises: an upper pump body (23) and a second impeller (24); The upper pump body (23) has a second inlet and a second outlet, and a second impeller (24) is arranged inside the upper pump body (23).

2. The vertical canned motor pump with double inlets and double outlets according to claim 1, It is characterized in that The lower pump head unit further comprises: a balance ring (13), a wear-resistant ring (14) and a front bearing body (15); A front bearing body (15) is installed inside the lower pump body (5); A balancing ring (13) is installed on the front bearing body (15); A wear-resistant ring (14) is mounted on the last axial force balancing impeller (12); The front bearing body (15) is provided with a circulation groove.

3. The vertical canned motor pump with double inlets and double outlets according to claim 2, It is characterized in that An axial force balancing impeller (12) is arranged inside the lower pump body (5); An arc groove is provided between the axial force balancing impeller (12) and the pump shaft (17).

4. A vertical canned motor pump with double inlets and double outlets according to claim 2 or 3, It is characterized in that The lower pump head unit further comprises: a pump head threading rod (4); The pump head through rod (4) is installed between the suction end cover (1) and the shielded motor unit.

5. The vertical canned motor pump with double inlets and double outlets according to claim 1, It is characterized in that The shielded motor unit comprises: a stator assembly and a rotor (18); The stator assembly comprises: a motor housing front cover (6), a motor housing (8), a stator (9) and a motor housing rear cover (22); The motor housing front cover (6) and the motor housing rear cover (22) are installed at two ends of the motor housing (8), and the stator (9) is arranged inside the motor housing (8); A rotor (18) is arranged inside the stator (9), and the rotor (18) is mounted on a pump shaft (17).

6. The vertical canned motor pump with double inlets and double outlets according to claim 5, It is characterized in that A stator shielding sleeve (20) is embedded inside the stator (9); The stator shielding sleeve (20) is welded to the motor housing front cover (6) and the motor housing rear cover (22) respectively.

7. The vertical canned motor pump with double inlets and double outlets according to claim 6, It is characterized in that The outer circumference of the rotor (18) is inlaid with a rotor shielding sleeve (19), and both ends of the rotor (18) are respectively inlaid with rotor shielding plates (7); The rotor shielding sleeve (19) is welded to the rotor shielding plate (7), and the rotor shielding plate (7) is welded to the pump shaft (17); There is a gap between the rotor shielding sleeve (19) and the stator shielding sleeve (20).

8. The vertical canned motor pump with double inlets and double outlets according to claim 1, It is characterized in that The upper pump head unit further comprises: a rear bearing body (25), a throttle sleeve (26) and a stud bolt (27); The rear bearing body (25) is located in the upper pump body (23) and is mounted on the pump shaft (17). A circulation hole is opened on the rear bearing body (25); A throttling sleeve (26) is arranged between the rear bearing body (25) and the pump shaft (17); The upper pump body (23) is connected to the shielded motor unit via a stud bolt (27).

9. The vertical canned motor pump with double inlets and double outlets according to claim 8, It is characterized in that The upper pump body (23) is a single-stage pump body, and the second impeller (24) is a single-stage impeller.

10. The vertical canned motor pump with double inlets and double outlets according to claim 1, It is characterized in that The pump shaft (17) is provided with a circulation hole.

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