CN217327690U

CN217327690U - Small-flow multistage centrifugal pump

Info

Publication number: CN217327690U
Application number: CN202220093126.8U
Authority: CN
Inventors: 赵立盛; 杜立安; 李长林; 苏清宵; 孙强; 单保钰
Original assignee: Dalian Shuanglong Pump Group Co ltd
Current assignee: Dalian Shuanglong Pump Group Co ltd
Priority date: 2022-01-14
Filing date: 2022-01-14
Publication date: 2022-08-30
Anticipated expiration: 2032-01-14

Abstract

The utility model relates to a small flow multistage centrifugal pump, including export section, suction segment and middle section, export section passes through isometric stud subassembly with middle section, suction segment in proper order and is connected, and the impeller shaft overflows the side and is equipped with first-stage open impeller, secondary open impeller in proper order, first-stage open impeller sets up between suction segment and stator, secondary open impeller sets up between middle section and last stator or stator, is located the single-row angular contact ball bearing that is equipped with seal assembly, deep groove ball bearing and two back to back installations in proper order on the shaft section of the impeller shaft in the bearing box body, is located the suction segment the tip of impeller shaft passes through the impeller fixed knot and constructs fixedly, and the one end of the impeller shaft that is located the bearing box body is provided with bearing clearance adjustment structure. The utility model adopts a back-opening structure, and the back-opening ring and the front-opening ring reduce the backflow, and the design is unique; the small-flow impeller is of a semi-open structure, so that the casting is easy, the flow channel is convenient to clean, and the efficiency is high; and the cost is saved.

Description

Small-flow multistage centrifugal pump

Technical Field

The utility model belongs to the technical field of multistage horizontal centrifugal pump, in particular to little discharge multistage centrifugal pump with cantilever, horizontal, open impeller characteristics.

Background

The existing multistage horizontal centrifugal pump is widely applied to industries such as power plants, coal chemical industry, petrochemical industry, papermaking, food and the like, and has a quite reliable operation performance. If the liquid with small flow rate (such as the flow rate of 0.5m3/h, the head of 200m and higher) is conveyed, and the viscosity is higher, the conventional multistage pump can not meet the requirement. The double-end support for small power of the traditional multi-stage pump in a BB structure has high cost; the traditional multi-stage pump is usually processed by backflow at a small flow rate point, so that the power is increased, and the cost is increased.

Disclosure of Invention

The utility model provides a technical problem provide a small discharge multistage centrifugal pump, with major axis cover location replacement for through minor axis and lock nut location, solved extravagant material, manufacturing cost is high, awkward problem.

The utility model adopts the technical proposal that: the utility model provides a small flow multistage centrifugal pump, includes export section, suction segment and middle section, and the export section is connected through isometric stud subassembly with middle section, suction segment in proper order, and the impeller shaft overflows the side and is equipped with first open impeller, secondary open impeller in proper order, first open impeller sets up between suction segment and stator, secondary open impeller sets up between middle section and last stator or stator, is located the single-row angular contact ball bearing that is equipped with seal assembly, deep groove ball bearing and two back to back installations in proper order on the shaft section of the impeller shaft in the bearing box body, is located the suction segment the tip of impeller shaft is fixed through impeller fixed knot structure, and the one end that is located the impeller shaft in the bearing box body is provided with bearing clearance adjustment structure.

The technical effects are as follows: the open impeller is light in weight, backflow is reduced by combining the open impeller with the opening ring, casting and machining are easy, the runner is convenient to clean, and efficiency is high.

Further optimize, impeller fixed knot constructs and contains impeller fastening nut and female O shape sealing washer of wheel.

The technical effects are as follows: the impeller shaft is fixed and positioned to prevent axial movement.

Further optimizing, the bearing clearance adjusting structure adopts two circular nuts at the rear side of the angular contact bearing, and the circular nuts are matched with the impeller shaft through fine threads.

The technical effects are as follows: the adjustment of bearing clearance is convenient, and the adjustment clearance is accurate.

Further optimizing, the first-stage open impeller and the second-stage open impeller adopt a back-opening structure, the front and back of the impellers are provided with opening rings, the processing surface of the blade at the back cover plate of the impeller is a straight surface, the range of axial clearance formed by the blade and the blade is 0.4-0.75 mm, the blade is thickened, the circumferential direction of the blade at the overflowing side of the impeller is designed into a spiral blade protruding structure with central symmetry, and the non-protruding part is hollowed to reduce weight.

The technical effects are as follows: the open impeller adopts a back open structure, the processing surface of the open blade at the back cover plate of the half open impeller is a straight surface and forms a small axial gap with the guide vane, and in addition, a small radial gap is formed at the positions of the suction section opening ring, the guide vane opening ring, the middle section opening ring and the impeller, so that the backflow loss is small, the blade flow surface processing is high in precision and hydraulic efficiency.

Further optimizing, the number of the secondary open impellers is 1-4.

The technical effects are as follows: and 3-4-level cantilever type multistage pump limit is broken, the device is suitable for a small-flow working condition, and the use cost is low.

The utility model has the advantages that:

1. the open impeller adopts a back-open structure, and the back-open ring and the front-back ring reduce backflow, and the design is unique.

2. The small-flow impeller is of a semi-open structure, so that the casting is easy, the flow channel is convenient to clean, and the efficiency is high;

3. the impeller is in a cantilever structure OH type, and only one set of seal is used. The multistage pump of BB structure must use two sets to seal, if systematic, must just use two sets of systems, consequently the utility model discloses a cost is practiced thrift greatly to the centrifugal pump structure.

Drawings

FIG. 1 is a sectional view of a small flow multistage centrifugal pump;

FIG. 2 is a cross-sectional view of the impeller;

fig. 3 is a front view of the impeller.

Reference numerals: 1-suction section, 2-first-stage open impeller, 3-guide vane, 4-middle section, 5-last-stage guide vane, 6-second-stage open impeller, 7-outlet section, 8-sealing assembly, 9-deep groove ball bearing, 10-impeller shaft, 11-bearing box, 12-angular contact ball bearing, 13-round nut, 14-rear bearing gland, 15-middle-stage mouth ring, 16-guide vane mouth ring, 17-suction section mouth ring, 18-impeller fastening nut, 19-nut O-shaped sealing ring, 20-isometric stud assembly, 201-first-stage impeller blade rear cover plate, 202-first-stage impeller rear mouth ring, 203-first-stage blade weight reduction part and 204-blade bulge.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

As shown in figure 1, a small flow multistage centrifugal pump, the pump body mainly includes export section 7, inhale section 1 and middle section 4, export section 7 is in proper order with middle section 4, inhale section 1 and pass through isometric stud subassembly 20 and be connected, impeller shaft 10 overflows the side and is equipped with first open impeller 2 in proper order, second open impeller 6, through impeller key-type connection, first open impeller 2 sets up between inhaling section 1 and stator 3, the quantity of second open impeller 6 is 1 ~ 4, if only install a second open impeller 6, then second open impeller 6 sets up between middle section 4 and last stator 5, if install 2 ~ 4 second open impeller 6, then lean on last second open impeller 6 to set up between middle section 4 and last stator 5, other second open impeller 6 set up between stator 3. The impeller shaft 10 is characterized in that a sealing assembly 8, a deep groove ball bearing 9 and two single-row angular contact ball bearings 12 which are arranged back to back are sequentially arranged on a shaft section of the impeller shaft 10 in a bearing box body 11, the end part of the impeller shaft 10 in the suction section 1 is fixed through an impeller fastening nut 18, a nut O-shaped sealing ring is arranged between the impeller fastening nut 18 and the front end face of the first-stage open impeller 2 for sealing, a bearing clearance adjusting structure is arranged at one end of the impeller shaft 10 in the bearing box body 11, a round nut 13 on the rear side of the two angular contact bearings 12 is adopted as the bearing clearance adjusting structure, and a fine-tooth thread fit is adopted between the round nut 13 and the impeller shaft 10. The impeller shaft 10 at the rear side of the round nut 13 is sleeved with a rear bearing gland 14, and the rear bearing gland 14 is connected with the bearing box body 11 through bolts.

The structure of the first-stage open impeller 2 is the same as that of the second-stage open impeller 6, the difference lies in the difference of the installation position, as shown in fig. 2 and fig. 3, the first-stage open impeller 2 is a cantilever structure, the first-stage open impeller 2 adopts a rear-opening structure, the front end of the first-stage open impeller 2 is provided with a suction section mouth ring 17, the rear end of the suction section mouth ring is provided with a guide vane mouth ring 16, the guide vane mouth ring 16 is arranged at the rear mouth ring position 202 of the first-stage impeller, the blade processing surface of the rear cover plate position 201 of the first-stage impeller blade is a straight surface, the axial clearance range formed by the guide vane 3 is 0.4-0.75 mm, the integral blade is thickened, the circumferential direction of the blade at the overflowing side of the first-stage open impeller 2 is designed into a spiral blade bulge 204 structure with central symmetry, and the non-bulge part is hollowed to reduce the weight to form a first-stage blade weight position 203.

Similarly, the secondary open impeller 6 is of a cantilever structure, the secondary open impeller 6 adopts a rear opening structure, the front end of the secondary open impeller 6 is provided with a middle section opening ring 15, the rear end of the middle section opening ring is provided with a guide opening ring 16, the guide opening ring 16 is arranged at the rear opening ring of the secondary impeller, the blade processing surface at the rear cover plate of the secondary impeller blade is a straight surface, the axial clearance range formed by the guide blade 3 is 0.4-0.75 mm, the whole blade is thickened, the circumferential direction of the blade at the overflowing side of the secondary open impeller 6 is designed to be a spiral blade protruding structure with central symmetry, and the non-protruding part is hollowed to reduce the weight to form a secondary blade weight reduction part.

The foregoing shows and describes the general principles and features of the present invention, together with the advantages thereof. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only illustrative of the principles of the present invention, and that various changes and modifications can be made without departing from the spirit and scope of the present invention, and these changes and modifications are all within the scope of the present invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A small flow multistage centrifugal pump characterized in that: including export section, suction segment and middle section, export section is connected through isometric stud subassembly with middle section, suction segment in proper order, and the impeller shaft overflows the side and is equipped with first-stage open impeller, secondary open impeller in proper order, first-stage open impeller sets up between suction segment and stator, secondary open impeller sets up between middle section and last stage stator or stator, is located the single-row angular contact ball bearing that is equipped with seal assembly, deep groove ball bearing and two back to back installations in proper order on the shaft section of the impeller shaft in the bearing housing, is located the suction segment the tip of impeller shaft is fixed through impeller fixed knot structure, and the one end that is located the impeller shaft in the bearing housing is provided with bearing clearance adjustment structure.

2. A small-flow multistage centrifugal pump according to claim 1, characterized in that: the impeller fixing structure comprises an impeller fastening nut and a female O-shaped sealing ring.

3. A small-flow multistage centrifugal pump according to claim 1, characterized in that: the bearing clearance adjusting structure adopts two circular nuts at the rear side of the angular contact bearing, and the circular nuts are matched with the impeller shaft through fine threads.

4. A small-flow multistage centrifugal pump according to claim 1, characterized in that: the impeller is characterized in that the first-stage open impeller and the second-stage open impeller are of a back-open structure, the front and back of the impeller are provided with opening rings, the machining surface of the blade at the back cover plate of the impeller is a straight surface, the range of an axial gap formed by the straight surface and a guide vane is 0.4-0.75 mm, the blade is thickened, the circumferential direction of the blade at the overflowing side of the impeller is designed to be a spiral blade protruding structure with central symmetry, and the non-protruding part is hollowed to reduce the weight.

5. A small-flow multistage centrifugal pump according to claim 1, characterized in that: the number of the secondary open impellers is 1-4.