CN215830788U - High cavitation condensate pump - Google Patents

Abstract

The utility model relates to a high cavitation condensate pump, which consists of a primary spiral shell, a secondary spiral shell, an inducer, a primary impeller, a secondary impeller, a guide bearing assembly, a middle bearing seat, a connecting pipe, a suction shell, a discharge seat, a mechanical seal, a bearing assembly, a supporting seat, a degassing pipe, a balance pipe, a transmission shaft, a working shaft and other parts.

Description

High cavitation condensate pump

Technical Field

The utility model relates to the technical field of water pumps, in particular to a high cavitation condensate pump.

Background

At present, nuclear power stations are vigorously developed in China, pumps used in the nuclear power stations are more and more, but the pumps which belong to intellectual property rights and are designed independently are few, most of the pumps are foreign technologies at present, the requirements of national localization proportion are not met, manufacturers capable of designing the pumps used in the nuclear power stations are few at present, most of the manufacturers have manufacturing qualification, even the manufacturers with the design qualification have limited design capability, most of the manufacturers are in localization design, many of the pumps cannot be designed independently, only a few of the manufacturers with the nuclear grade design qualification in China have the advantages that several nuclear grade pumps and non-nuclear grade pumps on second-generation and second-generation nuclear power stations are all in localization design, models and structures used are all available abroad, and basically are mapped on spare parts of the existing nuclear power stations.

The requirements of the current third-generation nuclear power station are more strict, the design life of important equipment is required to be more than 60 years, therefore, the third-generation pump product is not provided with an independent design structure in the technology, has no intellectual property right and is limited abroad, and the design and manufacturing cost of the power station is greatly increased, especially large-scale condensate pumps are unprecedented, the cylinder of the condensate pump in the previous thermal power station is about 7 meters at the longest, and the condensate pump in the current nuclear power station is about more than ten meters only because the cylinder of the water pump is long, so that the processing and the installation are both very difficult, and the strength of the cylinder is required to be enhanced.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects of the prior art, the utility model provides a high-cavitation condensate pump, which solves the problem of high difficulty in processing and mounting in the prior art.

In order to achieve the purpose, the utility model is realized by the following technical scheme: a high cavitation condensate pump comprises a cylinder, a transmission shaft, a working shaft, a locking nut, a guide bearing, a gland bush, a suction pipe, a double-circle nut, an inducer, a first suction impeller, a first-stage spiral shell, a second-stage impeller and a second-stage spiral shell;

the transmission shaft and the working shaft are connected together through a cylindrical coupler and a clamping sleeve, a guide bearing and a gland are fixed on the suction pipe through a locking nut, two inducers and a first-suction impeller are installed in the first-stage spiral shell through a double-circle nut, the front and rear opening rings of the first-stage impeller are connected with the first-stage spiral shell through a wear-resisting ring, a guide bearing assembly is connected between the first-stage spiral shell and the working shaft, the secondary impeller is installed at the position between the tail end of the first-stage spiral shell and the front end of the secondary spiral shell and is fixed through an end cover, and an opening ring is installed between the secondary impeller and the first-stage spiral shell.

Preferably, the secondary spiral shell and the spitting seat are provided with a first connecting pipe, a second connecting pipe and a pair of same middle bearing parts, the first connecting pipe and the second connecting pipe are connected with each other, the tail end of the first connecting pipe is connected with the middle bearing parts, the tail end of the middle bearing part is connected with the head end of the second connecting pipe, the tail end of the second connecting pipe is connected with the other middle bearing part, and the tail end of the other middle bearing part is connected with the spitting seat.

Preferably, install between transmission shaft and the spitting seat and press cover, balanced drum, snap ring and axle sleeve, the excircle department of axle sleeve is equipped with sealed chamber, the sealed intracavity is equipped with collection dress formula mechanical seal.

Preferably, the inner wall of the cylinder body is provided with a guard plate.

Preferably, the device also comprises a supporting seat, the spitting seat is connected with the supporting seat, and a bearing part is connected in the middle of the supporting seat.

Preferably, the spitting seat is provided with a degassing pipe.

Advantageous effects

The utility model provides a high cavitation condensate pump, which has the following beneficial effects:

1. the pump has simple structure, convenient installation and no complex part structure;

2. the first stage of the utility model adopts a double-suction impeller form, and the inducers are respectively added in front of the two suction ports of the double-suction impeller, so as to reduce the cavitation of the pump device and greatly improve the cavitation resistance of the pump;

3. the driving shaft and the guide bearing assembly on the transmission shaft are universal, so that the processing technology is reduced, and the universality of spare parts is improved;

4. the high-performance material is adopted, so that the 60-year operation life of the power station is ensured;

5. the design is advanced and reasonable, and in order to ensure stable and efficient operation in a 95% -105% flow area, a hydraulic model of the pump is optimized, so that hydraulic loss is reduced, and the efficiency of the whole machine is improved;

6. a support ring is arranged on the cylinder arm of the suction connecting pipe to increase the strength;

7. the integrated mechanical sealing structure is adopted, so that the installation is convenient, the sealing performance is good, and the integrated mechanical sealing structure is suitable for the long-term service life of a nuclear power station;

8. a first connecting pipe and a second connecting pipe of a two-section connecting pipe are arranged between the last-stage spiral shell and the spitting seat, and two middle bearing parts are arranged at the same time, so that the processing difficulty of a long pipe is solved, and the strength of a pump of a connecting part is improved.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

In the figure: 1. a barrel; 2. locking the nut; 3. a gland; 4. a guide bearing; 5. a suction tube; 6. a double round nut; 7. an inducer; 8. a wear ring; 9. a first suction impeller; 10. a working shaft; 11. a first-stage spiral shell; 12. a secondary impeller; 13. an oral ring; 14. a secondary spiral shell; 15. a guard plate; 16. an end cap; 17. a guide bearing assembly; 18. taking over a first pipe; 19. a barrel connector; 20. a card sleeve; 21. an intermediate bearing member; 22. a second connecting pipe; 23. a discharge seat; 24. a degassing tube; 25. pressing the sleeve; 26. a balancing drum; 27. a snap ring; 28. a shaft sleeve; 29. sealing the cavity; 30. a cartridge type mechanical seal; 31. a bearing member; 32. a supporting seat; 33. a drive shaft.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example (b): a high cavitation condensate pump has two protective plates 15 on the inner wall of the suction pipe 1. Firstly, a wear-resistant ring 8 is installed on a first-stage spiral shell 11, a group of guide bearing assemblies 17 are sleeved on a working shaft 10, the first-stage spiral shell 11 is sleeved on the working shaft 10, then the guide bearing assemblies 17 are fixed on the first-stage spiral shell 11, then an inducer 7, a first-stage impeller 9, the inducer 7 and two round nuts 6 are sequentially installed at the lower end of the working shaft 10, then a wear-resistant ring 8 is installed on a suction pipe 5, then the suction pipe 5 is installed on the first-stage spiral shell 11, and a guide bearing assembly 4 and a gland 3 are sequentially installed at the shaft end of the suction port 5 and then locked by a locking nut 2.

Then the sealing ring 13 is installed on the primary spiral shell 11, the secondary impeller 12 is sleeved on the working shaft 10 and fixed by the end cover 16, then a guide bearing assembly 17 is installed on the secondary spiral shell 14, then the secondary spiral shell 14 is fixed on the primary spiral shell 6, then the first connecting pipe 18 is connected to the tail end of the secondary spiral shell 14, then the middle bearing assembly 21 is sleeved on the transmission shaft 33 and connected with the tail end of the first connecting pipe 18 and then connected with the head end of the second connecting pipe 22, and the tail end of the second connecting pipe 22 is connected with the other middle bearing assembly 21 and then connected with the spitting seat 23.

A degassing tube 24 is connected to the ejection seat 23.

A pressing sleeve 25, a balance drum 26, a snap ring 27 and a shaft sleeve 28 are arranged between a transmission shaft 33 and a spitting seat 23, a sealing cavity 29 is arranged at the outer circle of the shaft sleeve 28, and a cartridge type mechanical seal 30 is arranged in the sealing cavity 29.

The discharge seat 23 and the support seat 32 are connected, and the bearing member 31 is connected to the support seat 32.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation. The use of the phrase "comprising one of the elements does not exclude the presence of other like elements in the process, method, article, or apparatus that comprises the element.

The working process is as follows: the transmission shaft 33 rotates to drive the working shaft 10, the primary impeller 9, the secondary impeller 12 and the inducer 7 to rotate, water is sucked from the suction pipe 5, is discharged into the secondary impeller 12 through the primary spiral shell 11 after the rotational energy of the inducer 7 and the primary impeller 9 is increased, is discharged into the secondary spiral shell 14 after the rotational energy of the secondary impeller 10 is increased, is rectified by the secondary spiral shell 14, is discharged into the first connecting pipe 18 and the second connecting pipe 22, and is discharged out of the pump through the discharge seat 23.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims (6)

1. A high cavitation condensate pump is characterized by comprising a cylinder body (1), a transmission shaft (33), a working shaft (10), a locking nut (2), a guide bearing (4), a gland (3), a suction pipe (5), a double-round nut (6), an inducer (7), a primary impeller (9), a primary spiral shell (11), a secondary impeller (12) and a secondary spiral shell (14);

the transmission shaft (33) is connected with the working shaft (10) through a cylindrical coupler (19) and a clamping sleeve (20), a guide bearing (4) and a gland (3) are fixed on a suction pipe (5) by a locking nut (2), two inducer wheels (7) and a first-stage impeller (9) are installed in the first-stage spiral shell (11) by a double-round nut (6), the front and rear opening ring of the first-stage impeller (9) is connected with the first-stage spiral shell (11) through a wear-resisting ring (8), a guide bearing assembly (17) is connected between the first-stage spiral shell (11) and the working shaft (10), a secondary impeller (12) is installed at a position between the tail end of the first-stage spiral shell (11) and the front end of a secondary spiral shell (14) and is fixed through an end cover (16), and an opening ring (13) is installed between the secondary impeller (12) and the first-stage spiral shell (11).

2. A high cavitation condensate pump according to claim 1, further comprising a spitting seat (23), a first connection pipe (18) and a second connection pipe (22) and a pair of identical intermediate bearing members (21) being respectively provided between the secondary spiral shell (14) and the spitting seat (23), the secondary spiral shell (14) being connected to a head end of the first connection pipe (18), a tail end of the first connection pipe (18) being connected to the intermediate bearing members (21), a tail end of the intermediate bearing member (21) being connected to a head end of the second connection pipe (22), a tail end of the second connection pipe (22) being connected to another intermediate bearing member (21), and a tail end of another intermediate bearing member (21) being connected to the spitting seat (23).

3. The high cavitation condensate pump as claimed in claim 2, characterized in that a pressing sleeve (25), a balance drum (26), a snap ring (27) and a shaft sleeve (28) are installed between the transmission shaft (33) and the discharge seat (23), a seal cavity (29) is installed at the outer circle of the shaft sleeve (28), and a cartridge type mechanical seal (30) is installed in the seal cavity (29).

4. A condensate pump with high cavitation in accordance with claim 3, characterized in that the inner wall of the cylinder (1) is provided with a shield (15).

5. A condensate pump with high cavitation according to claim 4, characterized in that it further comprises a support base (32), said spit-out base (23) and said support base (32) being connected, said support base (32) being connected in the middle with a bearing member (31).

6. A condensate pump with high cavitation according to claim 4, characterized in that the spit-out seat (23) is provided with a degassing tube (24).

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