CN114665686A

CN114665686A - Spiral electromagnetic pump

Info

Publication number: CN114665686A
Application number: CN202210375904.7A
Authority: CN
Inventors: 王冲; 徐帅; 杨红义; 余华金; 陈树明; 周立军; 吕明宇; 邰永; 杨晓茜; 梁胜莹
Original assignee: China Institute of Atomic of Energy
Current assignee: China Institute of Atomic of Energy
Priority date: 2022-04-11
Filing date: 2022-04-11
Publication date: 2022-06-24
Anticipated expiration: 2042-04-11
Also published as: CN114665686B

Abstract

The spiral electromagnetic pump comprises a pump ditch outer shell, a pump ditch inner shell, a pump ditch pipeline, a first spiral blade, a second spiral blade and an electromagnetic driving device. The pump channel housing defines a receiving cavity, and a radial peripheral wall of the pump channel housing is provided with a fluid inlet communicating with the receiving cavity. The pump ditch inner shell sets up in holding the intracavity. One part of the pump channel pipeline is positioned in the accommodating cavity, and the other part of the pump channel pipeline extends out of the accommodating cavity from one side axial end wall of the pump channel shell. An outer-layer annular flow passage is formed between the pump ditch pipeline and the pump ditch outer shell, and an inner-layer annular flow passage communicated with the outer-layer annular flow passage is formed between the pump ditch pipeline and the pump ditch inner shell. The first helical blade is arranged between the pump channel pipeline and the pump channel shell so as to form an outer-layer helical flow channel in the outer-layer annular flow channel; the second helical blade is arranged between the pump ditch pipeline and the pump ditch inner shell so as to form an inner layer helical flow passage in the inner layer annular flow passage. The electromagnetic driving device is used for providing electromagnetic force for driving the liquid metal to flow from the liquid flow inlet to the inner spiral flow passage along the outer spiral flow passage.

Description

Spiral electromagnetic pump

Technical Field

The invention relates to the technical field of electromagnetic pumps, in particular to a spiral electromagnetic pump.

Background

As an important liquid metal conveying device, the electromagnetic pump has the advantages of no medium contact, no moving part, complete sealing, simple and convenient maintenance and the like, and is widely applied to the field of nuclear power.

In a common application scenario of the electromagnetic pump, the size factor of the electromagnetic pump is not generally considered, and therefore, the electromagnetic pump generally has a larger size. However, in some special application scenarios, such as some vehicle-mounted devices or underwater devices, the total system space is limited, and the electromagnetic pump is required to be small in size and have a high head.

Disclosure of Invention

The application aims to provide a spiral electromagnetic pump with small volume and high lift.

In order to achieve the above object, an embodiment of the present application provides a solenoid pump, including:

a pump channel housing defining a containment chamber, a radial peripheral wall of the pump channel housing being provided with a liquid flow inlet communicating with the containment chamber for receiving liquid metal;

the pump ditch inner shell is arranged in the accommodating cavity;

the axial two ends of the pump ditch pipeline are both open ends, one part of the pump ditch pipeline is positioned in the accommodating cavity, the other part of the pump ditch pipeline extends out of the accommodating cavity from the axial end wall on one side of the pump ditch outer shell, an outer annular flow channel is formed between the pump ditch pipeline and the pump ditch outer shell, and an inner annular flow channel communicated with the outer annular flow channel is formed between the pump ditch pipeline and the pump ditch inner shell, so that liquid metal entering the accommodating cavity through the liquid flow inlet sequentially flows through the outer annular flow channel and the inner annular flow channel and flows out of the open end, positioned outside the accommodating cavity, of the pump ditch pipeline;

the first helical blade is arranged between the pump ditch pipeline and the pump ditch shell so as to form an outer-layer helical flow passage in the outer-layer annular flow passage;

the second spiral blade is arranged between the pump ditch pipeline and the pump ditch inner shell so as to form an inner layer spiral flow passage in the inner layer annular flow passage; and

and the electromagnetic driving device is used for providing electromagnetic force for driving the liquid metal to flow from the liquid flow inlet to the inner-layer spiral flow channel along the outer-layer spiral flow channel.

Drawings

Other objects and advantages of the present invention will become apparent from the following description of the invention which refers to the accompanying drawings, and may assist in a comprehensive understanding of the invention.

FIG. 1 is a cross-sectional schematic view of a solenoid pump according to one embodiment of the present invention;

FIG. 2 is an enlarged view of a portion of the solenoid pump of FIG. 1;

FIG. 3 is a schematic diagram of the configuration of the pump channel tubing of FIG. 1; and

FIG. 4 is a schematic diagram of the construction of the inner casing of the pump channel of FIG. 1.

It is noted that the drawings are not necessarily to scale and are merely illustrative in nature and not intended to obscure the reader.

Description of reference numerals:

100. a helical electromagnetic pump;

10. a pump channel inner shell; 102. an inner layer annular flow passage; 11. a straight pipe section; 111. a second helical blade; 112. a second flow guide part; 12. a flow guide section;

20. a pump channel housing; 201. a liquid stream inlet; 202. an outer layer annular flow passage; 21. an accommodating chamber; 22. a radial peripheral wall; 23. an axial end wall;

30. a pump trench pipeline; 301. an open end; 31. a first helical blade; 32. a first flow guide part; 321. a first side wall; 322. a second side wall; 323. connecting the side walls; 33. an axial end face;

40. an inner core; 50. an outer core; 60. a coil; 70. an insulating layer.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention. It should be apparent that the described embodiment is one embodiment of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.

It is to be noted that technical terms or scientific terms used herein should have the ordinary meaning as understood by those having ordinary skill in the art to which the present invention belongs, unless otherwise defined.

The meaning of "a plurality" in the description of embodiments of the invention is at least two, e.g., two, three, etc., unless explicitly specified otherwise.

Referring to fig. 1 and 2, a solenoid electromagnetic pump 100 according to an embodiment of the present invention includes: pump ditch outer shell 20, pump ditch inner shell 10, pump ditch pipeline 30, first helical blade 31, second helical blade 111 and electromagnetic drive.

The pump channel housing 20 defines a receiving chamber 21, and a radial peripheral wall 22 of the pump channel housing 20 is provided with a liquid flow inlet 201 communicating with the receiving chamber 21 for receiving liquid metal. The pump channel inner housing 10 is disposed in the accommodation chamber 21.

Both axial ends of the pump channel pipe 30 are open ends. A portion of the pump channel conduit 30 is located within the receiving cavity 21 and another portion extends from one side axial end wall 23 of the pump channel housing 20 to outside the receiving cavity 21. An outer annular flow passage 202 is formed between the pump ditch pipeline 30 and the pump ditch outer shell 20, and an inner annular flow passage 102 communicated with the outer annular flow passage 202 is formed between the pump ditch pipeline 30 and the pump ditch inner shell 10, so that liquid metal entering the accommodating cavity 21 through the liquid flow inlet 201 flows through the outer annular flow passage 202 and the inner annular flow passage 102 in sequence and flows out from an opening end 301 of the pump ditch pipeline 30, which is positioned outside the accommodating cavity 21.

The open end 301 of the pump channel pipe 30, which is located outside the accommodating cavity 21, is a liquid flow outlet of the solenoid pump 100.

The first helical blade 31 is disposed between the pump channel conduit 30 and the pump channel housing 20 to form an outer helical flow channel within the outer annular flow channel 202. The second helical blade 111 is disposed between the pump channel pipe 30 and the pump channel inner casing 10 to form an inner-layer helical flow channel in the inner-layer annular flow channel 102.

The electromagnetic driving device is used for providing electromagnetic force for driving the liquid metal to flow from the liquid flow inlet 201 to the inner spiral flow channel along the outer spiral flow channel.

In the embodiment of the present application, since the inner and outer double-layer spiral channels are formed inside the pump channel housing 20, when the electromagnetic driving device provides the electromagnetic force for driving the liquid metal to flow, the liquid metal is driven by the two spiral channels, so that the lift of the electromagnetic pump is significantly increased compared to the lift of one spiral channel.

In addition, compared with the spiral flow passage only arranged on one layer, the spiral electromagnetic pump 100 of the embodiment of the present application can effectively reduce the volume and weight of the electromagnetic pump, for example, the volume can be reduced by about 50%, because the inner and outer double-layer spiral flow passages are formed inside the pump channel casing 20. Meanwhile, the inner and outer double-layer spiral flow channels are formed inside the pump ditch shell 20, so that the efficiency of the spiral electromagnetic pump 100 can be improved, and compared with other types of electromagnetic pumps, the efficiency is improved by about 28%.

Referring to fig. 3, in some embodiments, a first helical blade 31 is formed on a radially outer surface of the pump channel tube 30. In such an embodiment, the first helical blade 31 may be an external helical groove or an external helical rib formed at the pump channel 30. The first helical blade 31 extends helically on the pump channel pipe 30. It will be readily appreciated that the pitch of the first helical blade 31 is much smaller than the length of the first helical blade 31 in the axial direction. For example, the length of the first helical blade 31 in the axial direction may be 5 times or more the pitch.

In some embodiments, the first helical blade 31 may be a clearance fit with the inner surface of the radial perimeter wall 22 of the pump channel housing 20. Thus, it is possible to effectively prevent the liquid metal from flowing directly through the gap between the radial end of the spiral vane and the radial peripheral wall 22 of the pump groove housing 20 without entering the spiral flow passage. The first helical blade 31 may be welded to the radially outer surface of the pump channel tube 30.

In other embodiments, the first helical blade 31 may also be formed on the inner surface of the radial peripheral wall 22 of the pump channel housing 20. The first helical blade 31 may be welded to the inner surface of the radial peripheral wall 22 of the pump trench housing 20.

Referring to fig. 4, in some embodiments, a second spiral vane 111 may be formed on the outer surface of the radial peripheral wall of the pump channel inner casing 10. In such an embodiment, the second helical blade 111 may be an external helical groove or an external helical rib formed on the radial peripheral wall of the pump groove inner casing 10. The second helical blade 111 extends helically on the radial peripheral wall of the pump channel inner casing 10. It will be readily appreciated that the pitch of the second helical blade 111 is much smaller than the length of the second helical blade 111 in the axial direction. For example, the length of the second helical blade 111 in the axial direction may be 5 times or more the pitch.

The second helical blade 111 is in clearance fit with the radially inner side surface of the pump channel conduit 30. Therefore, the liquid metal can be effectively prevented from flowing directly through the gap between the radial end of the helical blade and the pipe wall of the pump channel pipe 30 without entering the helical flow channel. The second helical blade 111 may be welded to the outer surface of the radial peripheral wall of the pump channel inner casing 10.

In other embodiments, the second helical blade 111 may also be formed on the radially inner surface of the pump channel tube 30. The second helical blade 111 may also be welded to the radially inner surface of the pump channel tube 30.

In some embodiments, the pitch of the first helical blade 31 and the second helical blade 111 are the same, so as to maintain the stability of the liquid metal flow as much as possible.

In some embodiments, the first helical blade 31 and the second helical blade 111 have the same length in the axial direction.

In some embodiments, the first helical blade 31 and the second helical blade 111 rotate in opposite directions to facilitate increasing the flow velocity of the liquid metal. In other embodiments, as shown in fig. 3 and 4, the rotation directions of the first helical blade 31 and the second helical blade 111 may be the same.

In some embodiments, the inner annular runner 102 has the same annular width as the outer annular runner 202, thereby facilitating maintaining stability of the liquid metal flow.

In some embodiments, the outer annular flow passage 202 has an annular width that is less than the diameter of the liquid flow inlet 201. Further, the annular width of the outer annular flow passage 202 is one third to one eighth of the diameter of the liquid flow inlet 201. Thus, when liquid metal flows in the spiral flow channel from the liquid inlet 201 into the outer annular flow channel 202, current can be conducted axially through the turns of liquid metal and the inter-turn helical blades in sequence, so that there is reliable electrical contact between the turns of the liquid metal channel and between the liquid metal and the channel walls, so that secondary current can flow axially through the turns of the channel in sequence.

In some embodiments, there is a spacing between an axial end face 33 of the pump channel conduit 30 located within the receiving cavity 21 and the other axial end wall of the pump channel housing 20. The inner annular flow passage 102 communicates with the outer annular flow passage 202 through this spacing.

The distance between the axial end face 33 of the pump channel duct 30 located in the accommodation chamber 21 and the axial end wall of the pump channel outer casing 20 on the side adjacent to the axial end face 33 is greater than the distance between the inner surface of the radial circumferential wall 22 of the pump channel outer casing 20 and the outer surface of the radial circumferential wall of the pump channel inner casing 10, so as to improve the continuity and stability of the liquid metal flow.

In other embodiments, at least one through hole may be provided near the axial end face 33 of the pump channel conduit 30 in the receiving cavity 21, so that the inner annular flow passage 102 and the outer annular flow passage 202 communicate through the at least one through hole.

In some embodiments, the axial end wall of the pump groove outer casing 20 on the side adjacent to the axial end face 33 is fixedly connected to the axial end wall of the pump groove inner casing 10 on the corresponding side. For example, the axial end wall of the pump groove outer casing 20 on the side adjacent to the axial end face 33 is welded to the axial end wall of the pump groove inner casing 10 on the corresponding side.

In some embodiments, the axial end wall portion of one side of the pump channel outer housing 20 adjacent the axial end face 33 serves as the axial end wall of the corresponding side of the pump channel inner housing 10. That is, the pump groove outer casing 20 shares one axial end wall with the pump groove inner casing 10. The end face of the radial pipe wall of the pump channel inner shell 10 is welded directly to one axial end wall of the pump channel outer shell 20.

The fluid inlet 201 may be located away from the axial end face 33 of the pump channel conduit 30 within the receiving cavity 21. So set up, be favorable to increasing the length of spiral runner.

The first helical blade 31 may extend from an axial end face 33 of the pump channel conduit 30 in the receiving chamber 21 in the direction of the liquid flow inlet 201.

The plurality of first flow guiding portions 32 are circumferentially arranged on the radial outer side surface of the pump ditch pipeline 30 close to the liquid flow inlet 201 at intervals, and the liquid metal entering the accommodating cavity 21 through the liquid flow inlet 201 enters the outer layer spiral flow channel after being guided by the plurality of first flow guiding portions 32, so that the liquid metal can flow according to the designed spiral flow channel.

The number of first flow guides 32 may be, for example, 3, 4, 5, or more. The length direction of the first flow guide part 32 forms an included angle with the axial direction of the pump channel pipeline 30.

The first flow guide part 32 includes a first sidewall 321, a second sidewall 322 connected to the first sidewall 321, and a connection sidewall 323 connecting the first sidewall 321 and the second sidewall 322. The first sidewall 321 and the second sidewall 322 are arc-shaped, and the first sidewall 321 and the second sidewall 322 are smoothly transited by an arc-shaped connecting sidewall 323. The arc shape of the first side wall 321 and the arc shape of the second side wall 322 are substantially the same as the spiral direction of the first spiral blade 31, so that the liquid metal can flow in a designed spiral flow channel more conveniently.

In some embodiments, the pump channel inner casing 10 includes a straight pipe section 11 having a uniform inner diameter and a flow guide section 12 adjoining the straight pipe section 11 and having a tapered inner diameter, the flow guide section 12 being closer to the liquid flow inlet 201 of the pump channel outer casing 20 than the straight pipe section 11. The flow guiding section 12 can reduce flow resistance loss.

The second helical blade 111 is formed on the radially outer side surface of the straight tube section 11.

The radial outer surface of the straight pipe section 11 between the second helical blade 111 and the flow guide section 12 is provided with a plurality of second flow guide portions 112 at intervals along the circumferential direction, and the liquid metal flowing out of the outer layer helical flow passage enters the pump ditch pipeline 30 after being guided by the plurality of second flow guide portions 112. The second flow guide 112 may have substantially the same shape as the first flow guide 32, and also has a first sidewall, a second sidewall connected to the first sidewall, and a connecting sidewall connecting the first sidewall and the second sidewall. The first and second sidewalls of the second guide part 112 have substantially the same arc shape as the spiral direction of the second spiral blade 111.

In some embodiments, the first helical blade 31, the second helical blade 111 and the pump channel tube 30 are the same material. For example, when the operating temperature is below 600 ℃, the first helical blade 31, the second helical blade 111 and the pump channel 30 are generally made of austenitic stainless steel.

In some embodiments, the electromagnetic drive includes: an inner core 40, an outer core 50, and a plurality of coils 60.

The inner core 40 is disposed within the pump channel inner housing 10. In some embodiments, the inner core 40 may be formed by stacking a plurality of silicon steel sheets in a circumferential direction on the radially inner side of the pump channel inner casing 10. In some embodiments, the inner core 40 may be comprised of a plurality of segmental cores. Each fan-shaped iron core is formed by tightly laminating a plurality of silicon steel sheets along the circumferential direction. A support shaft may be provided inside the pump groove inner casing 10 to support the inner core 40.

Note that the specific form of the inner core 40 is not limited to this. In other embodiments, the inner core 40 may have other configurations as are commonly used in the art.

The outer core 50 is disposed radially outward of the pump groove casing 20. Outer core 50 may extend axially along pump channel housing 20 radially outward thereof. The plurality of coils 60 are provided to the outer core 50.

In some embodiments, the outer core 50 is provided with a plurality of circumferentially extending winding slots along its length. The winding slots are equally spaced along the length of the outer core 50. Each coil 60 is correspondingly disposed in one winding slot of the outer core 50.

In other embodiments, outer core 50 is provided with a plurality of axially extending slots along its circumferential direction. Each slot may be formed by recessing downward from the upper surface of outer core 50, and both axial sides of the slot are open ends. A plurality of coils 60 are inserted into each slot, and the coils 60 are distributed along the depth direction of the groove. In such an embodiment, the coil 60 can be directly removed and installed from the slot without cutting the pipe, reducing the risk of liquid metal leakage and the introduction of air impurities into the liquid metal system that contaminate the quality of the liquid metal. Furthermore, this arrangement also facilitates natural ventilation heat dissipation of the coil 60, i.e., without the need for an additional cooling system.

The pump channel housing 20 also typically has a higher temperature due to the fact that the liquid metal flowing into the pump channel housing 20 is at a too high temperature. A thermal insulation layer 70 may be provided between outer core 50 and pump groove housing 20 to block radial heat transfer from pump groove housing 20 toward outer core 50 to prevent excessive temperatures of outer core 50 and coil 60. In some embodiments, the material of the thermal insulation layer 70 may be a short fiber thermal insulation felt.

Compared with a cylindrical induction type electromagnetic pump, the spiral electromagnetic pump 100 in the embodiment of the application has the advantages that under the condition of the same flow-lift performance index, the spiral electromagnetic pump 100 in the embodiment of the application has higher efficiency and smaller volume, and is suitable for occasions with strict limits on installation space and efficiency indexes, including nuclear submarines, space piles, small piles and the like.

It should also be noted that, in the case of the embodiments of the present invention, features of the embodiments and examples may be combined with each other to obtain a new embodiment without conflict.

The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and the scope of the present invention is subject to the scope of the claims.

Claims

1. A solenoid pump, comprising:

the pump ditch inner shell is arranged in the accommodating cavity;

the first spiral blade is arranged between the pump ditch pipeline and the pump ditch shell so as to form an outer layer spiral flow passage in the outer layer annular flow passage;

2. The helical electromagnetic pump of claim 1, wherein said first helical blade is formed on a radially outer surface of said pump channel tube.

3. The helical electromagnetic pump of claim 2, wherein said first helical blade is in clearance fit with an inner surface of a radially peripheral wall of said pump channel housing.

4. The helical electromagnetic pump of claim 1, wherein said second helical blade is formed on an outer surface of a radially peripheral wall of said pump channel inner casing.

5. The helical electromagnetic pump of claim 4, wherein said second helical blade is clearance fit with a radially inner surface of said pump channel tube.

6. The solenoid pump of claim 1 wherein said first and second helical blades have the same pitch and are rotated in opposite directions.

7. The helical electromagnetic pump of claim 1, wherein said inner annular flow passage has the same annular width as said outer annular flow passage.

8. The helical electromagnetic pump of claim 7, wherein the annular width of said outer annular flow passage is one third to one eighth of the diameter of the fluid inlet.

9. The helical electromagnetic pump according to claim 1, wherein a space exists between an axial end face of the pump channel pipeline located in the accommodating cavity and the other axial end wall of the pump channel outer shell, so that an outer annular flow passage is formed between the pump channel pipeline and the pump channel outer shell, and an inner annular flow passage communicated with the outer annular flow passage is formed between the pump channel pipeline and the pump channel inner shell.

10. The helical electromagnetic pump of claim 9, wherein a spacing between an axial end face of the pump channel conduit within the receiving cavity and a side axial end wall of the pump channel outer housing adjacent the axial end face is greater than a spacing between an inner surface of a radial perimeter wall of the pump channel outer housing and an outer surface of a radial perimeter wall of the pump channel inner housing.

11. The spiral electromagnetic pump of claim 9, wherein one axial end wall of the outer pump casing adjacent to the axial end face is fixedly connected to a corresponding axial end wall of the inner pump casing; or

And one side axial end wall part of the pump groove outer shell adjacent to the axial end face is used as an axial end wall of the corresponding side of the pump groove inner shell.

12. The helical electromagnetic pump of claim 1, wherein said fluid flow inlet is disposed distal to an axial end face of said pump channel conduit within said containment chamber;

the first helical blade extends from an axial end face of the pump channel pipe located in the accommodating cavity in the direction of the liquid flow inlet.

13. The helical electromagnetic pump according to claim 1, wherein a plurality of first flow guiding portions are circumferentially arranged on a radially outer surface of the pump channel pipe close to the liquid flow inlet at intervals, and the liquid metal entering the accommodating cavity through the liquid flow inlet is guided by the plurality of first flow guiding portions to enter the outer layer helical flow channel.

14. The helical electromagnetic pump of claim 1, wherein said pump trench inner shell comprises a straight tube section of uniform internal diameter and a flow guide section adjoining said straight tube section and having a tapered internal diameter, said flow guide section being closer to the fluid inlet of said pump trench outer shell than said straight tube section;

wherein the second helical blade is formed on a radially outer side surface of the straight tube section.

15. The helical electromagnetic pump according to claim 14, wherein a plurality of second flow guiding portions are circumferentially provided at intervals on a radially outer surface of the straight pipe section between the second helical blade and the flow guiding section, and the liquid metal flowing out of the outer layer helical flow passage is guided by the plurality of second flow guiding portions and then enters the pump ditch pipeline.

16. The solenoid pump of claim 1, wherein said electromagnetic drive comprises:

the internal iron core is arranged in the pump channel inner shell;

an outer core disposed radially outward of the pump gallery housing; and

and a plurality of coils disposed on the outer core.

17. The helical electromagnetic pump of claim 16, wherein a thermal barrier is disposed between said outer core and said pump channel housing.