A compact toroidal linear induction electromagnetic pump

Abstract

The present invention discloses a compact annular linear induction electromagnetic pump, which includes an inductor assembly and a pump groove assembly. The inductor assembly includes an outer housing body. A magnetic field equalizing tube is arranged inside the outer housing body. A plurality of coils and a plurality of silicon steel rings are sleeved on the magnetic field equalizing tube. The coils and the silicon steel rings are arranged alternately at intervals. A radially arranged notch groove is provided on the silicon steel ring. A silicon steel strip arranged axially is fixedly connected inside the outer housing body. The outer ring edges of each silicon steel ring are all connected to the silicon steel strip. The pump groove assembly includes a pump groove outer wall tube located inside the magnetic field equalizing tube. A pump groove inner wall tube is arranged inside the pump groove outer wall tube. An annular flow channel is formed between the pump groove outer wall tube and the pump groove inner wall tube. An inner iron core is arranged inside the pump groove inner wall tube. The present invention adopts a split stator structure and innovatively introduces a magnetic field equalizing tube, significantly improving the length ratio of the effective electromagnetic induction area. Moreover, the pump body components are simply assembled, have good heat dissipation performance, reduce the volume of the electromagnetic pump, and are applicable to scenarios with limited space conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid metal electromagnetic pumps, and particularly to a compact ring linear induction electromagnetic pump. Background Art

[0002] As an important liquid metal conveying device, the liquid metal electromagnetic pump has been widely used in the nuclear power field due to its advantages of non-contact with the medium, complete sealing, and simple maintenance. Moreover, such devices have broad application prospects in fields such as non-ferrous metal casting and heat dissipation of electronic components. At present, in the technical field of liquid metal electromagnetic pumps in China, the most widely used type of electromagnetic pump is the ring linear induction pump.

[0003] Common ring linear induction pumps generally adopt an open E-shaped stator structure. The open E-shaped stator structure is very conducive to the embedding of formed coils. However, due to its characteristics, it is very difficult to apply to scenarios with limited space conditions. Its main defects are as follows:

[0004] Low power density: For the E-shaped stator structure with a fully open slot, the stator tooth part is relatively narrow, the magnetic field influence area starting from the stator tooth part is small, and the length ratio of the effective electromagnetic induction area is low. This results in a relatively large length dimension of the electromagnetic pump and a low power density. Therefore, a compact design cannot be achieved in the length direction.

[0005] Difficult assembly: Limited by the working principle of the ring linear induction pump, the coils of the ring linear induction pump need to be placed in advance, and then each integral formed E-shaped stator is installed in sequence. Since there are many slots on each E-shaped stator, it is difficult to achieve the lossless embedding of multiple formed coils at the same time. Moreover, the constraint of the installed E-shaped stator on the coil will further exacerbate the difficulty of subsequent installation, and it is very easy to cause insulation damage to the coil. In engineering applications, to maintain its installation processability, a large gap needs to be reserved between the formed coil and the stator. This gap results in insufficient compactness in the length direction of the traditional ring linear induction pump electromagnetic pump.

[0006] Poor heat dissipation: The heat dissipation of the coil is the most important link for all excited electromagnetic pumps. There is a large assembly gap reserved between the stator and the coil of the traditional ring linear induction pump, and the adopted E-stator structure lacks a dedicated heat dissipation air duct, resulting in low cooling efficiency. Therefore, only the number of winding turns can be increased and the current density can be reduced, but this obviously increases the radial dimension of the electromagnetic pump. To solve this problem, it can be considered to add ventilation holes in the tooth part. Although the method is feasible, it will obviously increase the length dimension of the electromagnetic pump and is also not conducive to the miniaturization of the pump body structure. Summary of the Invention

[0007] To overcome the deficiencies and existing problems of the prior art, the present invention provides a compact ring linear induction electromagnetic pump, which adopts a split stator structure and innovatively introduces a magnetic equalizing tube, significantly improving the length ratio of the effective electromagnetic induction area. Moreover, the pump body components are simply assembled, have good heat dissipation, reduce the volume of the electromagnetic pump, and are applicable to scenarios with limited space conditions.

[0008] The present invention is realized through the following technical solutions:

[0009] A compact ring linear induction electromagnetic pump includes an inductor assembly and a pump groove assembly. The inductor assembly includes an outer shell body. Inside the outer shell body, there is a magnetic equalizing tube. A number of coils and a number of silicon steel rings are sleeved on the magnetic equalizing tube. The coils and the silicon steel rings are arranged alternately at intervals. The silicon steel rings are provided with radially arranged notch grooves. Axially arranged silicon steel bars are fixedly connected inside the outer shell body. The outer peripheral edges of each silicon steel ring are all connected to the silicon steel bars. The pump groove assembly includes a pump groove outer wall tube located inside the magnetic equalizing tube. Inside the pump groove outer wall tube, there is a pump groove inner wall tube. An annular flow channel is formed between the pump groove outer wall tube and the pump groove inner wall tube. An inner iron core is provided inside the pump groove inner wall tube.

[0010] A support ring is provided inside the coil and sleeved on the magnetic equalizing tube.

[0011] There are four silicon steel bars, which are evenly distributed at the four corners inside the outer shell body. Each silicon steel bar is connected to the outer peripheral edges of all the silicon steel rings.

[0012] The outer shell body includes a bottom plate. End face plates are provided at both ends of the bottom plate. A middle shell is provided between the two end face plates.

[0013] An insulating layer is provided between the pump groove outer wall tube and the magnetic equalizing tube.

[0014] The two ends of the pump groove outer wall tube are respectively fixed to the two ends of the outer shell body. And a connection flange is provided at one end of the pump groove outer wall tube, and the connection flange is fixed to the outer shell body.

[0015] An inlet support member is provided at the liquid inlet end of the pump groove inner wall tube. An outlet support member is provided at the liquid outlet end of the pump groove inner wall tube. The inner iron core is sealed inside the pump groove inner wall tube.

[0016] An inlet side adapter is provided at the liquid inlet end of the pump groove outer wall tube. An outlet side adapter is provided at the liquid outlet end of the pump groove outer wall tube. The end of the inlet support member is a hemispherical structure, and a number of support protrusions are provided on the outer wall. The outlet support member is fixed to the outlet side adapter, and a diversion hole for conducting the inner cavity of the outlet side adapter and the annular flow channel is provided on the outlet support member.

[0017] The inlet side adapter is connected with an inlet pipe joint, and the outlet side adapter is connected with an outlet pipe joint.

[0018] The silicon steel ring and the silicon steel bars are both formed by stacking silicon steel sheets. The coil is wound with high-temperature resistant electromagnetic wire, and the inner iron core is processed from a whole silicon steel rod.

[0019] The present invention adopts a split-type silicon steel ring and silicon steel bars spliced together to form a stator structure similar to a pump. This structure is convenient for assembly. There is no gap assembly between the silicon steel ring and the coil, reducing the radial size of the electromagnetic pump. Moreover, the gap between the outer housing and the silicon steel ring and silicon steel bars forms a natural cooling air duct, greatly improving the heat dissipation performance of the electromagnetic pump. Additionally, by setting the magnetic flux equalizing tube, the effective magnetic flux distribution in the liquid metal is greatly improved. At the same time, it is equivalent to adding pole shoes to the silicon steel ring. Without reducing the slot fill factor, the effect of a semi-open slot motor stator is achieved, increasing the length ratio of the effective electromagnetic induction area, thus facilitating the realization of a compact structure design. Brief Description of the Drawings

[0020] Figure 1 is a three-dimensional structure schematic diagram of the present invention;

[0021] Figure 2 is a cross-sectional structure schematic diagram of the present invention;

[0022] Figure 3 is an internal structure schematic diagram of the present invention;

[0023] Figure 4 is a structure schematic diagram of the inductor assembly in the present invention;

[0024] Figure 5 is a structure schematic diagram of the magnetic flux equalizing tube in the present invention;

[0025] Figure 6 is a connection structure schematic diagram of the coil, silicon steel ring and magnetic flux equalizing tube in the present invention;

[0026] Figure 7 is a connection structure schematic diagram of the silicon steel ring and the silicon steel bars in the present invention;

[0027] Figure 8 is a structure schematic diagram of the pump groove assembly in the present invention;

[0028] Figure 9 is a cross-sectional structure schematic diagram of the pump groove assembly in the present invention;

[0029] Figure 10 is a structure schematic diagram at the pump groove inner wall tube in the present invention;

[0030] Figure 11 is a structure schematic diagram of the inner iron core in the present invention.

[0031] In the figure: 1 - Inductor assembly, 11 - Outer housing, 111 - Bottom plate, 112 - End panel, 113 - Middle shell, 114 - Heat dissipation holes, 12 - Magnetic field equalizing tube, 13 - Coil, 131 - Support ring, 14 - Silicon steel ring, 141 - Notch groove, 142 - Connection groove, 15 - Silicon steel strip, 2 - Pump groove assembly, 21 - Outer wall tube of pump groove, 22 - Inner wall tube of pump groove, 23 - Annular flow channel, 24 - Inner iron core, 241 - Iron core groove, 25 - Inlet support, 251 - Support protrusion, 26 - Outlet support, 27 - Diversion hole, 28 - Outlet side adapter, 29 - Inlet side adapter, 210 - Heat insulation layer, 3 - Connecting flange, 4 - Inlet liquid pipe joint, 5 - Outlet liquid pipe joint. Detailed implementation mode

[0032] For the convenience of understanding by those skilled in the art, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] As Figure 1 、 Figure 2 and Figure 3 shown, a compact ring linear induction electromagnetic pump includes an inductor assembly 1 and a pump groove assembly 2, which generates a magnetic field. The pump groove assembly 2 provides a physical path for the flow of liquid metal and interacts with the magnetic field generated by the inductor assembly 1 to generate flow.

[0034] As Figure 4 、 Figure 5 、 Figure 6 and Figure 7 (Combined with Figure 1 and Figure 2 ) shown, the inductor assembly 1 includes an outer housing 11. The outer housing 11 includes a bottom plate 111. End panels 112 are provided at both ends of the bottom plate 111, and a middle shell 113 is provided between the two end panels 112. Heat dissipation holes 114 are provided on the outer housing 11 to facilitate internal heat dissipation.

[0035] Inside the outer casing 11, there is a magnetic flux equalizing tube 12. A number of coils 13 and a number of silicon steel rings 14 are sleeved on the magnetic flux equalizing tube 12. The coils 13 and the silicon steel rings 14 are arranged alternately at intervals. The magnetic flux equalizing tube 12 and the silicon steel rings 14 are in close fit. Its function is to extend the length ratio of the effective electromagnetic induction area and improve the electromagnetic thrust per unit length. Inside the outer casing 11, there is a silicon steel strip 15 arranged axially and fixedly connected. The outer peripheral edges of each silicon steel ring 14 are all connected to the silicon steel strip 15, that is, the silicon steel strip 15 is perpendicular to the plane where the silicon steel sheet 14 is located. The silicon steel strip 15 and the outer casing 11 act as a magnetic yoke to form a magnetic circuit. The silicon steel ring 14, the silicon steel strip 15 and the outer casing 11 form a stator structure similar to a pump. The magnetic flux equalizing tube 12 can greatly improve the effective magnetic flux distribution in the liquid metal. At the same time, it is equivalent to adding pole shoes on the silicon steel ring 14. Without reducing the slot fill factor, the effect of the stator of a semi-open slot motor is achieved, the length ratio of the effective electromagnetic induction area is improved, so as to facilitate the realization of a compact structure design, and on the basis of realizing compactness, the efficiency can also be significantly improved. The magnetic flux equalizing tube 12 reduces the energy loss of the magnetic field, increases the operation stability of the electromagnetic pump and improves the efficiency at the same time. The gap between the outer casing 11 and the silicon steel ring 14 and the silicon steel strip 15 forms a natural cooling air duct, which greatly improves the heat dissipation performance of the electromagnetic pump. Combined with the heat dissipation holes 114, the heat dissipation effect is further improved.

[0036] On the tube wall of the magnetic flux equalizing tube 12, there are a number of longitudinally arranged longitudinal grooves 121. On the tube wall of the magnetic flux equalizing tube 12, there are axially arranged transverse grooves 122. The setting of the longitudinal grooves 121 and the transverse grooves 122 can improve the heat dissipation performance at the magnetic flux equalizing tube 12. On the silicon steel ring 14, there are radially arranged notch grooves 141. The notch grooves 141 can prevent the silicon steel ring 14 from forming a circular current loop. On the outer peripheral edge of the silicon steel ring 14, there is a connection groove 142. The silicon steel ring 14 and the silicon steel strip 15 are connected and installed and fixed through the connection groove 142, which is convenient for the splicing and installation of the silicon steel ring 14 and the silicon steel strip 15. There are four silicon steel strips 15, which are evenly distributed at the four corners inside the outer casing 11. Each silicon steel strip 15 is connected to the outer peripheral edges of all the silicon steel rings 14. The silicon steel ring 14 and the silicon steel strip 15 are both stacked by silicon steel sheets. The silicon steel ring 14 and the silicon steel strip 15 are spliced to form a stator structure similar to a pump. This structure is convenient for assembly. There is no gap assembly between the silicon steel ring 14 and the coil 15, reducing the radial size of the electromagnetic pump.

[0037] Inside the coil 14, there is a support ring 141. The support ring 141 is sleeved on the magnetic flux equalizing tube 12. The support ring 141 is wound around the center by the coil 14 and serves as the winding support of the coil 14. The coil 14 is wound by high-temperature electromagnetic wire.

[0038] Such as Figure 8 、 Figure 9 、 Figure 10 And Figure 11 (Combined with Figure 1 And Figure 2) As shown in the figure, the pump groove assembly 2 includes a pump groove outer wall pipe 21 located inside the magnetic field equalizing tube 12. A pump groove inner wall pipe 22 is arranged inside the pump groove outer wall pipe 21. An annular flow channel 23 is formed between the pump groove outer wall pipe 21 and the pump groove inner wall pipe 22, and the annular flow channel 23 is used for liquid metal to pass through. A heat insulation layer 210 is arranged between the pump groove outer wall pipe 21 and the magnetic field equalizing tube 12, effectively forming heat insulation to prevent the heat of the pump groove outer wall pipe 21 from affecting the performance of the magnetic field equalizing tube 12.

[0039] An inner iron core 24 is arranged inside the pump groove inner wall pipe 22. The inner iron core 24 is tightly wrapped by the pump groove inner wall pipe 22. Its function is to construct a magnetic flux return channel. The heat of the inner iron core 24 is led out through the pump groove inner pipe 22, thereby preventing the inner iron core 24 from losing magnetism due to high temperature. The inner iron core 24 is processed from a whole silicon steel rod. A plurality of iron core grooves 241 arranged axially are formed on the inner iron core 24, which can avoid the generation of circular current in the inner iron core 24.

[0040] An inlet support 25 is arranged at the liquid inlet end of the pump groove inner wall pipe 22. The end of the inlet support 25 is of a hemispherical structure, and several support protrusions 251 are arranged on the outer wall. The hemispherical structure is convenient for guiding the flow of liquid metal and reducing the flow resistance. The support protrusions 251 abut against the pump groove outer wall pipe 21 to play a supporting role. An outlet support 26 is arranged at the liquid outlet end of the pump groove inner wall pipe 22. The inner iron core 24 is sealed inside the pump groove inner wall pipe 22.

[0041] An inlet side adapter 29 is arranged at the liquid inlet end of the pump groove outer wall pipe 21. An outlet side adapter 28 is arranged at the liquid outlet end of the pump groove outer wall pipe 21. The outlet support 26 is fixed to the outlet side adapter 28, and a diversion hole 27 for conducting the inner cavity of the outlet side adapter 28 and the annular flow channel 23 is arranged on the outlet support 26. For the convenience of production and subsequent installation, the outlet support 26 and the outlet side adapter 28 are processed into an integral structure.

[0042] Both ends of the pump groove outer wall pipe 21 are respectively fixed to both ends of the outer housing 11, and a connecting flange 3 is arranged at one end of the pump groove outer wall pipe. The connecting flange 3 is fixed to the outer housing 11, which is convenient for the fixed installation between the pump groove assembly 2 and the inductor assembly 1. The inlet side adapter 29 is connected with an inlet pipe joint 4, and the outlet side adapter 28 is connected with an outlet pipe joint 5. Liquid metal flows in from the inlet pipe joint 4, and after passing through the annular flow channel 23, it flows out from the outlet pipe joint 5. The inlet pipe joint 4 and the outlet pipe joint 5 are convenient for connecting external pipelines.

[0043] The above embodiments are the preferred implementation manners of the present invention, and are not intended to limit the present invention. Without departing from the inventive concept of the present invention, any obvious replacement is within the protection scope of the present invention.

Claims

1. A compact annular linear induction electromagnetic pump, comprising an inductor assembly (1) and a pump channel assembly (2), characterized in that: The inductor assembly comprises an outer shell (11), a uniform magnetic tube (12) is arranged in the outer shell, a plurality of coils (13) and a plurality of silicon steel rings (14) are sleeved on the uniform magnetic tube, the coils and the silicon steel rings are arranged alternately, the silicon steel rings are provided with radially arranged notched grooves (141), an axially arranged silicon steel bar (15) is connected and fixed in the outer shell, the outer ring edge of each silicon steel ring is connected to the silicon steel bar, the pump groove assembly comprises a pump groove outer wall tube (21) located in the uniform magnetic tube, a pump groove inner wall tube (22) is arranged in the pump groove outer wall tube, an annular flow channel (23) is formed between the pump groove outer wall tube and the pump groove inner wall tube, and an inner iron core (24) is arranged in the pump groove inner wall tube; The magnetic balancing tube and the silicon steel ring are tightly matched, a plurality of longitudinal grooves arranged longitudinally are provided on the tube wall of the magnetic balancing tube, and a transverse groove arranged axially is provided on the tube wall of the magnetic balancing tube; A support ring (131) is provided inside the coil (13), and the support ring is sleeved on the magnetic tube; There are four silicon steel bars (15) evenly distributed at the four corners of the outer shell (11), and each silicon steel bar is connected to the outer ring edge of all the silicon steel rings (14).

2. The compact annular linear induction electromagnetic pump according to claim 1, characterized in that: The outer shell (11) comprises a bottom plate (111), both ends of the bottom plate are provided with end panels (112), and a middle shell (113) is provided between the two end panels.

3. The compact annular linear induction electromagnetic pump according to claim 1 or 2, characterized in that: A heat insulation layer (210) is provided between the pump trench outer wall tube (21) and the magnetic balancing tube (12).

4. The compact annular linear induction electromagnetic pump according to claim 3, characterized in that: The two ends of the pump trench outer wall pipe (21) are respectively fixed to the two ends of the outer shell (11), and one end of the pump trench outer wall pipe is provided with a connecting flange (3), which is fixed to the outer shell.

5. The compact annular linear induction electromagnetic pump according to claim 4, characterized in that: An inlet support member (25) is provided at the liquid inlet end of the pump groove inner wall tube (22), an outlet support member (26) is provided at the liquid outlet end of the pump groove inner wall tube, and the inner iron core (24) is sealed in the pump groove inner wall tube (22).

6. The compact annular linear induction electromagnetic pump according to claim 5, characterized in that: The liquid inlet end of the pump groove outer wall tube (21) is provided with an inlet side adapter (29), and the liquid outlet end of the pump groove outer wall tube is provided with an outlet side adapter (28). The end of the inlet support member (25) is a hemispherical structure, and the outer wall is provided with a plurality of support protrusions (251). The outlet support member (26) is fixed to the outlet side adapter (28), and the outlet support member is provided with a guide hole (27) for connecting the inner cavity of the outlet side adapter and the annular flow channel.

7. The compact annular linear induction electromagnetic pump according to claim 6, characterized in that: The inlet-side adapter (29) is connected to a liquid inlet pipe connector (4), and the outlet-side adapter (28) is connected to a liquid outlet pipe connector (5).

8. The compact annular linear induction electromagnetic pump according to claim 7, characterized in that: The silicon steel ring (14) and the silicon steel bar (15) are both formed by stacking silicon steel sheets, the coil (13) is wound by high-temperature resistant electromagnetic wire, and the inner iron core (24) is processed from a whole silicon steel bar.

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