CN215633790U

CN215633790U - Multi-stage liquid hydrogen centrifugal pump

Info

Publication number: CN215633790U
Application number: CN202121724793.3U
Authority: CN
Inventors: 康明霞; 张�诚; 杨偲睿
Original assignee: Individual
Current assignee: Suzhou Qingquan Energy Technology Co ltd
Priority date: 2021-07-27
Filing date: 2021-07-27
Publication date: 2022-01-25
Anticipated expiration: 2031-07-27

Abstract

The utility model discloses a multi-stage liquid hydrogen centrifugal pump. The centrifugal pump comprises a centrifugal pump body, wherein the centrifugal pump body is formed by assembling an upper shell and a lower shell, a permanent magnet motor is installed inside the upper shell, a motor shaft of the permanent magnet motor extends into the lower shell, an axial thrust balancing device, a plurality of impellers and an inducer are installed inside the lower shell, the impellers are more than five, and the thrust balancing device, the impellers and the inducer are sequentially installed on the motor shaft from top to bottom. The multistage liquid hydrogen centrifugal pump provided by the utility model not only solves the centering problem caused by coupling connection in the traditional pump, reduces the abrasion of equipment, improves the stability and service life of the equipment, but also can improve the flow of an impeller inlet, improves the cavitation resistance of the impeller, and is reasonable in structural design, high in working efficiency, small in size and suitable for popularization and use.

Description

Multi-stage liquid hydrogen centrifugal pump

Technical Field

The utility model relates to the field of power equipment, in particular to a multistage liquid hydrogen centrifugal pump.

Background

Hydrogen energy is used as a clean renewable energy source. Has the advantages of rich sources, large combustion value, good safety and the like, and is called as green energy in the future. The non-renewable nature of fossil energy such as coal, oil, and natural gas will inevitably be exhausted at some future time. Therefore, from the viewpoint of sustainable development of energy, it is necessary to develop energy systems by replacing non-renewable energy sources such as fossil energy with hydrogen energy and other renewable energy sources.

The liquid hydrogen centrifugal pump is with pump and motor integral erection in sealed metal container, can accomplish zero and leak, avoids producing explosive environment, eliminates the core power take off equipment of the transport liquefied natural gas of ignition condition and relevant cryogenic liquids, and the key problem that independently development need be solved at present includes: the research on the electrical equipment of the liquid hydrogen centrifugal pump mainly comprises the research on low-temperature electrical insulating materials and low-temperature cables, the research on the sealing technology of electrical connection parts, the research on the lubricating and cooling technology of a submerged motor and the low-temperature working characteristics of the motor; the research on the pump body of the multistage liquid hydrogen centrifugal pump mainly comprises the research on the cavitation law of liquid hydrogen in the pump, and the research on the optimization and self-balancing mechanism of the liquid hydrogen centrifugal pump by the structural design of an impeller and an inducer of the low-temperature centrifugal pump.

For all liquid systems, liquid delivery distribution is the basic operation of management, liquid hydrogen transport in liquid hydrogen fuel systems is the most basic operation, and the most critical component is the liquid hydrogen pump. In the prior art, liquid hydrogen pumps which are developed and used are divided into two types, one type adopts a gas-driven power turbine, and then is connected to a pump through a power transmission shaft so as to drive a cryogenic pump to work; another type is a pump driven by an electric motor. The current pump driven by the motor is mature, not only has stable performance, but also is convenient to control. However, the iron-cored motor generates a large amount of heat, and when the motor is operated by directly placing the motor in low-temperature liquid hydrogen, the low-temperature liquid hydrogen is vaporized in a large amount. In addition, the stator winding of the coreless motor needs to be formed by pouring, the difference between the shrinkage rate of the material and the shrinkage rate of the copper wire in the prior art is large, and the winding is deformed greatly when the coreless motor works in liquid hydrogen, so that the motor cannot work normally. Therefore, the conventional motor cannot be directly immersed in liquid hydrogen for operation.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems, the utility model provides a multi-stage liquid hydrogen centrifugal pump.

According to one aspect of the utility model, a multistage liquid hydrogen centrifugal pump is provided, which comprises a centrifugal pump body assembled by an upper casing and a lower casing, wherein a permanent magnet motor is installed inside the upper casing, a motor shaft of the permanent magnet motor extends into the lower casing, an axial thrust balancing device, a plurality of impellers and an inducer are installed inside the lower casing, the impellers are provided with more than five impellers, and the thrust balancing device, the impellers and the inducer are sequentially installed on the motor shaft from top to bottom.

The multistage liquid hydrogen centrifugal pump provided by the utility model not only solves the centering problem caused by coupling connection in the traditional pump, reduces the abrasion of equipment, improves the stability and service life of the equipment, but also can improve the flow of an impeller inlet, improves the cavitation resistance of the impeller, and is reasonable in structural design, high in working efficiency, small in size and suitable for popularization and use.

In some embodiments, the bottom of the lower housing is provided with a liquid inlet, and the top of the upper housing is provided with a liquid outlet. Therefore, liquid hydrogen and the like can be introduced from the liquid inlet and output from the liquid outlet.

In some embodiments, the permanent magnet motor has a motor rotor and a motor stator thereon. From this, permanent magnet motor's concrete structure has been set up, and wherein, motor rotor and motor stator all are located the outside at the motor shaft, and motor stator is located motor rotor's inboard.

In some embodiments, the upper housing has an upper bearing and a lower bearing mounted therein, wherein the permanent magnet motor is mounted between the upper bearing and the lower bearing, and the thrust balancing device, the impeller, and the inducer are all located below the lower bearing. Thereby, the specific structure inside the upper housing and the mounting position and relationship between the structures inside the upper housing are further provided.

In some embodiments, the upper bearing and the lower bearing are both low temperature rolling bearings. Therefore, the upper bearing and the lower bearing are set to be low-temperature rolling bearings, and the centrifugal pump can be conveniently used in a low-temperature environment.

In some embodiments, the inducer consists of four helical blades and a hub. Therefore, the structure of the impeller is arranged, the flow of the inlet of the impeller can be effectively improved, and the cavitation resistance of the impeller is improved.

Drawings

FIG. 1 is a schematic structural diagram of a multi-stage liquid hydrogen centrifugal pump according to an embodiment of the present invention;

FIG. 2 is a schematic sectional view taken along the direction A-A of a multistage liquid hydrogen centrifugal pump according to an embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view of the upper housing shown in FIG. 2;

fig. 4 is a schematic cross-sectional view of the lower housing shown in fig. 2.

In the figure: the centrifugal pump comprises a centrifugal pump body 1, a permanent magnet motor 2, a thrust balancing device 3, an impeller 4, an inducer 5, a liquid inlet 11, a liquid outlet 12, an upper bearing 13, a lower bearing 14, an upper shell 15, a lower shell 16, a motor shaft 21, a motor rotor 22 and a motor stator 23.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Fig. 1 schematically shows the structure of a multistage liquid hydrogen centrifugal pump according to an embodiment of the present invention, fig. 2 shows the sectional structure of the multistage liquid hydrogen centrifugal pump in fig. 1 in the a-a direction, fig. 3 shows the sectional structure of the upper casing in fig. 2, and fig. 4 shows the sectional structure of the lower casing in fig. 2. As shown in fig. 1 to 4, the centrifugal pump is mainly a liquid hydrogen centrifugal pump, and includes a centrifugal pump body 1, the centrifugal pump body 1 is assembled by an upper casing 15 and a lower casing 16, and other main structures, including a permanent magnet motor 2, a thrust balancing device 3, an impeller 4, an inducer 5, and the like, are all installed inside the upper casing 15 and the lower casing 16.

A liquid inlet 11 is arranged at the bottom of the lower shell 16, and a liquid outlet 12 is arranged at the top of the upper shell 15, so that liquid hydrogen and the like can be introduced from the liquid inlet 11 and output from the liquid outlet 12 when in use.

An upper bearing 13 and a lower bearing 14 are installed inside the upper housing 15, the upper bearing 13 being located at an upper portion, and the lower bearing 14 being located at a middle portion. The permanent magnet motor 2 is installed between the upper bearing 13 and the lower bearing 14, and the upper end and the lower end of the permanent magnet motor are respectively installed on the upper bearing 13 and the lower bearing 14.

In the center of the permanent magnet motor 2 is a vertical motor shaft 21, the bottom of the motor shaft 21 extending into the lower housing 16. The permanent magnet motor 2 further has a motor rotor 22 and a motor stator 23, wherein the motor rotor 22 and the motor stator 23 are both located outside the motor shaft 21, and the motor stator 23 is located inside the motor rotor 22.

Preferably, the upper bearing 13 and the lower bearing 14 are both low-temperature rolling bearings.

In the embodiment, the permanent magnet motor 2 is adopted, so that the working efficiency can be improved, the product volume is reduced, compared with an asynchronous motor, the permanent magnet motor 2 can establish a strong permanent magnetic field without additional energy, the heat productivity of the motor is smaller, and the vaporization of liquid hydrogen can be reduced.

One thrust balancing device 3, five or more impellers 4 and one inducer 5 are also mounted inside the lower housing 16, and the thrust balancing device 3, each impeller 4 and the inducer 5 are located below the lower bearing 14 and are mounted on the motor shaft 21 of the permanent magnet motor 2 in order from top to bottom.

In the present embodiment, since each impeller 4 and inducer 5 are connected to motor shaft 21, a coupling is not required, and the problem of centering does not have to be considered, thereby improving the stability of the pump. And the axial thrust balancing device 3 is adopted, so that the abrasion of the equipment can be reduced, and the service life of the equipment can be prolonged.

Preferably, the inducer 5 is composed of four helical blades and a hub, and the structure can improve the flow rate at the inlet of the impeller 4 and improve the cavitation resistance of the impeller 4.

To sum up, this multistage liquid hydrogen centrifugal pump structural design is reasonable, and work efficiency is high, and is small, is fit for using widely.

What has been described above are merely some embodiments of the present invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the inventive concept thereof, and these changes and modifications can be made without departing from the spirit and scope of the utility model.

Claims

1. Multistage liquid hydrogen centrifugal pump, its characterized in that: including centrifugal pump body (1), centrifugal pump body (1) comprises last casing (15) and lower casing (16), the internally mounted of going up casing (15) has permanent-magnet machine (2), and motor shaft (21) of permanent-magnet machine (2) extend to in lower casing (16), the internally mounted of casing (16) has an axial thrust balancing unit (3), a plurality of impeller (4) and an inducer (5) down, impeller (4) have more than five, and thrust balancing unit (3), each impeller (4) and inducer (5) from the top down install in proper order on motor shaft (21).

2. The multi-stage liquid hydrogen centrifugal pump of claim 1, wherein: the bottom of lower casing (16) is provided with inlet (11), the top of going up casing (15) is provided with liquid outlet (12).

3. The multi-stage liquid hydrogen centrifugal pump of claim 1, wherein: the permanent magnet motor (2) is provided with a motor rotor (22) and a motor stator (23).

4. The multi-stage liquid hydrogen centrifugal pump of claim 1, wherein: the upper shell (15) is internally provided with an upper bearing (13) and a lower bearing (14), wherein the permanent magnet motor (2) is arranged between the upper bearing (13) and the lower bearing (14), and the thrust balance device (3), the impeller (4) and the inducer (5) are all positioned below the lower bearing (14).

5. The multi-stage liquid hydrogen centrifugal pump of claim 4, wherein: the upper bearing (13) and the lower bearing (14) are both low-temperature rolling bearings.

6. The multi-stage liquid hydrogen centrifugal pump of claim 1, wherein: the inducer (5) consists of four helical blades and a hub.