CN217327689U

CN217327689U - Horizontal multistage barrel type centrifugal pump with welding type middle section

Info

Publication number: CN217327689U
Application number: CN202220092525.2U
Authority: CN
Inventors: 赵立盛; 李志博; 陈万博; 祖贺远; 张馨予; 李长林
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 discloses a horizontal multistage cylinder centrifugal pump with welding formula middle section, including bivalve structure and rotor part structure and bearing body structure, bivalve structure includes shell structure and interior shell structure, and shell structure is connected fixedly by outer barrel part and end cap part, and interior shell structure is connected gradually by inhaling section, middle section and last stage stator and constitutes, and the rotor part structure includes the axle, and epaxial first impeller, stator, secondary impeller, balance drum, the dividing snap ring that is provided with, first impeller, the series connection of secondary impeller set up, and the bearing body structure includes drive end bearing body structure and non-drive end bearing body structure, and non-drive end bearing body structure is provided with a set of angular contact ball bearing, drive end bearing body structure be provided with a set of tapered roller bearing, the middle section adopt the welding to form. The cost of the middle section in the casting process is reduced, the appearance is attractive after casting, the pump is convenient to disassemble and replace, the weight reduction effect is achieved, and the stability and the reliability are better.

Description

Horizontal multistage barrel centrifugal pump with welded middle section

Technical Field

The utility model relates to a high temperature, high-pressure conveying equipment technical field, concretely relates to horizontal multistage cylinder centrifugal pump with welding formula middle section is applicable to inflammable, explosive, easy vaporization, poisonous, harmful, the transport that has corrosivity and valuable liquid medium under the high temperature high pressure state.

Background

At present, high-temperature and high-pressure multistage centrifugal pumps used in the fields of petroleum, chemical engineering, refining, metallurgy, mines, pharmacy, acid making, printing and dyeing, food and the like are all single-shell, sectional and radial subdivision types, the pressure bearing capacity of the multistage centrifugal pumps is low, the safety coefficient is low, the axial force of the operation of the general pumps is very large, the service life of the operation cycle is short, the failure rate is high, the pump equipment can easily cause that the production of enterprises can not operate normally, stably and reliably in the production process, and the production and maintenance cost of the equipment can also be increased. Although the structure of the common double-shell multistage centrifugal pump is a double-shell type, the common double-shell multistage centrifugal pump is still a sectional type and radial subdivision type multistage centrifugal pump, the arrangement forms of impellers are all in a series installation form, the axial force of the pump during operation is very large, the diameter of a balancing disc for balancing the axial force can be determined only through accurate calculation, however, the actual working conditions of the pump during operation are varied, so that the axial force generated by the balancing disc is difficult to balance during the actual operation of the pump, the size of the balancing disc is difficult to accurately design, the balancing disc is easy to wear and fail due to the fact that the axial force is difficult to effectively balance, the service life of the pump is seriously shortened, the pump equipment is easy to cause abnormal stable and reliable operation of enterprise production during the production process, the production and maintenance costs of the equipment are also increased, and particularly, the pump equipment is easy to burn and operate under the high-temperature and high-pressure state, The conveying medium leakage caused by the failure of the conveying of the explosive, easily vaporized, toxic and harmful medium can cause serious environmental pollution, serious personal safety accidents in serious conditions and even other serious results which cannot be imagined. In addition, the inner shell part of the double-shell multistage centrifugal pump comprises a suction section, a middle section and a discharge section, the middle section generally adopts a casting integrated forming process, in the machining and casting processes, the cost of the middle section is high in the casting process, the appearance is not attractive after the middle section is cast, and the disassembly and the replacement are complicated.

Disclosure of Invention

The utility model provides a be not enough to prior art exists, the utility model provides a horizontal multistage cylinder centrifugal pump with welding formula middle section, axial force hardly obtains balanced effectively when can overcoming the single casing of above conventionality and the transport high lift liquid that double-shell multistage centrifugal pump exists well, fault rate takes place defects such as height, maintenance cost height, and the middle section adopts weld forming simultaneously, and is with low costs, convenient dismantlement and change.

The technical proposal adopted by the utility model is a horizontal multistage cylinder type centrifugal pump with a welding type middle section, which comprises a double-shell structure, a rotor part structure and a bearing body structure, the double-shell structure comprises an outer shell structure and an inner shell structure, the outer shell structure is fixedly connected by an outer cylinder part and a large end cover part, the inner shell structure is formed by connecting a suction section, a middle section and a final stage guide vane in sequence, the rotor part structure comprises a shaft, the shaft is provided with a primary impeller, a guide vane, a secondary impeller, a balance drum and a halving snap ring, the primary impeller and the secondary impeller are connected in series, a balance drum sleeve is arranged in the big end cover, the balance drum sleeve is contacted with the balance drum, the halving snap ring is fixedly locked with the balance drum through a snap ring sleeve, the suction section is arranged at the driving end of the shaft, and the outer side of the suction section is connected with a sealed box body; big end cover part opposite side is connected fixedly with the sealed box, sealed box and bearing frame A and bearing frame B fixed connection, the bearing body structure includes drive end bearing body structure and non-drive end bearing body structure, non-drive end bearing body structure be provided with a set of angular contact ball bearing body, drive end bearing body structure be provided with a set of tapered roller bearing body, the middle section adopt the welding to form.

More preferably, the inner shell structure connects the last stage guide vane and the suction section together through a through bolt, and a rotor structure, a guide vane and a middle section are arranged between the last stage guide vane and the suction section; the suction section is tensioned through a pressure plate and is positioned with the outer cylinder body; an adjusting reed is arranged between the final stage guide vane and the large end cover part; sealing gaskets are arranged among the steps matched with the large end cover part, the outer cylinder body and the suction section.

More preferably, the angular contact ball bearing body comprises a bearing frame B, the bearing frame B is connected with the sealed box body through a stud, the angular contact ball bearing body is locked on the shaft through a first locking nut, and a dustproof disc B is arranged on the shaft on one side of the angular contact ball bearing body; the end part of the angular contact ball bearing body is provided with a bearing gland B; the tapered roller bearing body comprises a bearing frame A, the bearing frame A is connected with the sealing box body through a stud, the tapered roller bearing body is locked on the shaft through a second locking nut, a dustproof disc A is arranged on the shaft on one side of the tapered roller bearing body, and a bearing adjusting ring is arranged at the position of a bearing gear of the shaft; and a bearing gland A is arranged at the end part of the tapered roller bearing body.

The utility model has the advantages that: 1. the structural form of the pump adopts the structural design form of horizontal multistage radial subdivision, cylinder type and back pull-out type full core pulling, so that the structural design of the pump is optimized reasonably, the installation is simple and convenient, the design pressure can reach 16MPa, the design temperature can reach 450 ℃, the application range of the pump is wider, the performance is more reliable, and the operation is safer. 2. The axial force generated by the pump during operation is balanced by the balance drum and the balance sleeve which are arranged at the non-driving end, so that the service life of a rolling bearing is shortened due to the fact that the axial force is not effectively balanced, the operation stability and reliability of the pump are improved, and the service life of the pump is prolonged. 3. The pump adopts a center line supporting structure type, a group of angular contact ball bearings are further arranged at the non-driving end (namely the tail end) of the pump to bear the axial force which is not established at the moment of hydraulic automatic balance of the pump at the starting moment, and a group of cylindrical roller bearings are arranged at the driving end (namely the coupling end) to bear the thermal deformation quantity generated by the thermal expansion of all structural components of the pump under the high-temperature and high-pressure state, so that the starting and the running of the pump under the working condition of high temperature and high pressure can be more stable, safe and reliable. 4. Two ends of the horizontal double-shell radial subdivision symmetrically-arranged barrel type multi-stage centrifugal pump are respectively provided with a group of angular contact ball bearings and a group of cylindrical roller bearings to support the whole rotor component, so that the stability and the reliability of the horizontal double-shell radial subdivision symmetrically-arranged barrel type multi-stage centrifugal pump during operation are ensured. 5. The pump has a weight reduction effect. The pump reduces the manufacturing cost and shortens the processing time. The pump has the advantages of reliable operation and good performance in the whole operation process, and does not have the problems of leakage and the strength of the pressure-bearing part. 6. The middle section is formed by welding, the cost of the middle section in the casting process is reduced, the appearance is attractive after the middle section is cast, and the middle section is convenient to disassemble and replace.

Drawings

Fig. 1 is the sectional view of the high-temperature high-pressure horizontal multistage barrel type centrifugal pump of the utility model.

Fig. 2 is a schematic diagram of a middle section of a prior art casting mold.

Fig. 3 is the utility model discloses a welding forming's middle section schematic diagram.

In the figure: 1 bearing gland B, 2 bearing bracket B, 3 dustproof disc B, 4 big end covers, 5 outer cylinders, 6 through-lever bolts, 7 secondary impellers, 8 primary impellers, 9 suction sections, 10 sealing box bodies, 11 bearing bracket A, 12 tapered roller bearing bodies, 13 bearing gland A, 14 dustproof disc A, 15 pressing plates, 16 guide vanes, 17 middle sections, 18 final guide vanes, 19 balance drums, 20 balance drum sleeves, 21 split half snap rings, 22 snap ring sleeves, 23 shafts, 24 angular contact ball bearing bodies, 25 locking nuts, 26 bearing adjusting rings and 27-second locking nuts.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of the embodiments of the present invention, as generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

The utility model discloses a horizontal multistage cylinder centrifugal pump with welding formula middle section, including double-casing structure and rotor part structure and bearing body structure, double-casing structure includes shell structure and interior shell structure, shell structure is connected fixedly by outer barrel 5 part and end cover 4 part, interior shell structure is connected gradually by inhaling section 9, middle section 17 and last stage stator 18 and constitutes, rotor part structure include axle 23, be provided with first impeller 8, stator 16, secondary impeller 7, balance drum 19, divide half snap ring 21 on the axle 23, first impeller 8, secondary impeller 7 are established ties and are set up, be provided with balance drum cover 20 in the end cover 4, balance drum cover 20 and balance drum 19 contact, divide half snap ring 21 to lock fixedly with balance drum 19 through setting up snap ring cover 22, inhale the drive end that section 9 set up at axle 23, the outer side of the suction section 9 is connected with a sealed box body 10; big end cover 4 part opposite side and sealed box 10 are connected fixedly, sealed box 10 and bearing frame A11 and bearing frame B2 fixed connection, the bearing body structure includes drive end bearing body structure and non-drive end bearing body structure, non-drive end bearing body structure be provided with a set of angular contact ball bearing 24, drive end bearing body structure be provided with a set of tapered roller bearing 12, middle section 17 adopt the welding to form. The inner shell structure connects a last stage guide vane 18 and a suction section 9 together through a through bolt 6, and a rotor structure, a guide vane 16 and a middle section 17 are arranged between the last stage guide vane 18 and the suction section 9; the suction section 9 is tensioned through a pressure plate 15 and is positioned with the outer cylinder 5; an adjusting reed is arranged between the final stage guide vane 18 and the large end cover 4 part; sealing gaskets are arranged among the steps matched with the large end cover 4 part, the outer cylinder 5 and the suction section 9. The angular contact ball bearing body 24 comprises a bearing frame B2, the bearing frame B2 is connected with the seal box body 10 through a stud, the angular contact ball bearing body 24 is locked on the shaft 23 through a first locking nut 25, and a dustproof disc B3 is arranged on the shaft 23 on one side of the angular contact ball bearing body 24; a bearing gland B1 is arranged at the end part of the angular contact ball bearing body 24; the tapered roller bearing body 12 comprises a bearing frame A11, the bearing frame A11 is connected with the sealed box body 10 through a stud, the tapered roller bearing body 12 is locked on the shaft 23 through a second locking nut 27, a dustproof disc A14 is arranged on the shaft 23 on one side of the tapered roller bearing body 12, and a bearing gear position of the shaft 23 is provided with a bearing adjusting ring 26; the end of the tapered roller bearing body 12 is provided with a bearing gland A13.

In a horizontal multistage centrifugal barrel pump with a welded mid-section, the impeller and vanes 16 together may comprise a stage of the pump. When the pump is filled with water, the impeller is driven by the prime motor to rotate at a high speed, so that a low-pressure area is generated at the inlet of the pump when the impeller presses out liquid, a pressure difference is formed between the low-pressure area and the outer side to generate an attraction force effect, and the liquid with the same volume enters the water suction chamber of the pump through the suction pipe, so that continuous medium flow can be kept when the impeller rotates. The impeller rotates to drive the liquid to rotate, so that the energy of the liquid is increased, and the lift is generated; liquid enters the guide vane 16, the guide vane 16 sends the liquid to the inlet of the next-stage impeller, and so on, the lift of the multi-stage pump is the superposition of each stage of lift.

The foregoing shows and describes the basic principles and principal features of the invention, together with the advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. Horizontal multistage barrel centrifugal pump with welding formula middle section, its characterized in that: including bivalve structure and rotor part structure and bearing body structure, bivalve structure include outer shell structure and interior shell structure, outer shell structure connect fixedly by outer barrel (5) part and end cover (4) part, interior shell structure connect gradually by inhaling section (9), middle section (17) and last stage stator (18) and constitute, rotor part structure include axle (23), axle (23) on be provided with first impeller (8), stator (16), secondary impeller (7), balance drum (19), divide half snap ring (21), first impeller (8), secondary impeller (7) establish ties and set up, end cover (4) in be provided with balance drum cover (20), balance drum cover (20) and balance drum (19) contact, divide half snap ring (21) to lock fixedly through setting up snap ring cover (22) and balance drum (19), the suction section (9) is arranged at the driving end of the shaft (23), and the outer side of the suction section (9) is connected with a sealed box body (10); big end cover (4) part opposite side and sealed box (10) are connected fixedly, sealed box (10) and bearing frame A (11) and bearing frame B (2) fixed connection, the bearing body structure include drive end bearing body structure and non-drive end bearing body structure, non-drive end bearing body structure be provided with a set of angular contact ball bearing body (24), drive end bearing body structure be provided with a set of tapered roller bearing body (12), middle section (17) adopt the welding to form.

2. The horizontal multi-stage barrel centrifugal pump with a welded mid-section of claim 1, wherein: the inner shell structure connects a last stage guide vane (18) and a suction section (9) together through a through bolt (6), and a rotor structure, a guide vane (16) and a middle section (17) are arranged between the last stage guide vane (18) and the suction section (9); the suction section (9) is tensioned through a pressure plate (15) and is positioned with the outer cylinder body (5); an adjusting reed is arranged between the last stage guide vane (18) and the large end cover (4); sealing gaskets are arranged among the large end cover (4) part, the outer cylinder (5) and the step matched with the suction section (9).

3. The horizontal multistage barrel centrifugal pump with a welded midsection of claim 1, wherein: the angular contact ball bearing body (24) comprises a bearing frame B (2), the bearing frame B (2) is connected with the sealing box body (10) through a stud, the angular contact ball bearing body (24) is locked on the shaft (23) through a first locking nut (25), and a dustproof disc B (3) is arranged on the shaft (23) on one side of the angular contact ball bearing body (24); a bearing gland B (1) is arranged at the end part of the angular contact ball bearing body (24); the tapered roller bearing body (12) comprises a bearing frame A (11), the bearing frame A (11) is connected with the sealing box body (10) through a stud, the tapered roller bearing body (12) is locked on the shaft (23) through a second locking nut (27), a dustproof disc A (14) is arranged on the shaft (23) on one side of the tapered roller bearing body (12), and a bearing gear position of the shaft (23) is provided with a bearing adjusting ring (26); the end part of the tapered roller bearing body (12) is provided with a bearing gland A (13).