Centrifugal pump

Abstract

The utility model belongs to the technical field of centrifugal pumps, and discloses a centrifugal pump which comprises a pump body shell provided with a liquid inlet and a liquid outlet, and a pump cavity is formed in the pump body shell and comprises a drainage cavity and a driving cavity which are communicated with each other; the liquid inlet is communicated with the drainage cavity, and the liquid outlet is communicated with the driving cavity; and the power part is arranged in the driving cavity. According to the centrifugal pump, the drainage cavities are formed in the pump cavities, and fluid flows into the middle position of the impeller on the premise that the thickness of the pump body can be reduced by constructing the internal flow channels between the pump cavities, so that the centrifugal driving principle of the centrifugal pump is better utilized; the flow guide structure is arranged on the isolation wall, the flow resistance generated when fluid enters the inner circumference of the impeller is reduced, and therefore the efficiency of the centrifugal pump is improved.

Description

Technical Field

[0001] This utility model belongs to the field of centrifugal pump technology, and specifically relates to a centrifugal pump. Background Technology

[0002] A centrifugal pump is a device that converts the mechanical energy of a prime mover into fluid energy to achieve the purpose of pumping fluid. It is widely used in cooling systems, medical equipment, laboratory equipment, and fluid drive applications in the pharmaceutical industry.

[0003] Reducing the thickness of the pump body is crucial for improving the performance of centrifugal pumps. For example, with the development of the AI ​​industry and the improvement of computing power, the performance of hardware devices such as chips has become more powerful, resulting in increased heat generation in devices such as computers and mobile phones. As laptops and mobile phones become thinner and lighter, space constraints become more pronounced, and thinner liquid cooling systems can reduce physical space requirements. As the fluid-driven component in a liquid cooling system, the thickness of the centrifugal pump is a significant factor limiting the overall thickness reduction of the cooling system. Therefore, designing thinner centrifugal pumps is one of the keys to solving this problem.

[0004] Centrifugal pumps use the principle of centrifugal force to draw fluid in from the center, and after the impellers continuously perform work on the fluid, it flows out from the outer outlet. In existing technologies, centrifugal pumps mainly achieve thinner thicknesses by changing the direction of the fluid inlet; for example, the fluid inlet direction can be set perpendicular to the direction of the impeller rotation axis.

[0005] An example of current technology is as follows: Figure 1 As shown, the existing centrifugal pump includes an inlet body 100, and a flow channel body 500 is provided on the inlet end face 300 of the inlet body 100. The flow channel body 500 is connected to the inlet end face 300 in an elbow-shaped structure. The flow channel body 500 has a radial inlet flow channel 200 inside, and the radial inlet flow channel 200 has an inlet interface 400 to realize radial liquid inlet and reduce the thickness of the pump.

[0006] The aforementioned centrifugal pump reduces its thickness to some extent by altering the direction of the inlet pipe through an elbow-shaped bend. However, this method has significant shortcomings: First, based on the working principle of centrifugal pumps, this method fails to guide fluid from the center through a specific and reasonable structure, thus having limited effect on further reducing pump thickness. Second, the elbow-shaped connection alters the fluid flow direction, increasing fluid resistance and consequently affecting pump performance. Therefore, simply adjusting the fluid inlet direction to reduce thickness without corresponding optimization of the flow channel design results in increased resistance within the pump chamber, causing significant energy loss and reducing pump efficiency. Optimizing the fluid flow path and incorporating structures such as a drainage cavity can more effectively reduce pump thickness while ensuring smooth fluid flow within the pump, reducing energy loss, and improving pump delivery performance.

[0007] In summary, based on the principle of centrifugal pumps, it is necessary to develop a centrifugal pump with a specific inlet cavity and flow guiding structure to allow fluid to flow in closer to the center and to better achieve the purpose of thinning the pump body and reducing flow resistance. Utility Model Content

[0008] To address the above problems, this utility model provides a centrifugal pump, employing the following technical solution:

[0009] A centrifugal pump includes: a pump body housing with an inlet and an outlet, the pump body housing having a pump chamber with an isolation wall inside; a drainage chamber, the isolation wall dividing the pump chamber into a drainage chamber and a drive chamber; the inlet being sequentially connected to the drainage chamber and the drive chamber, and the outlet being connected to the drive chamber; and a power unit disposed within the drive chamber.

[0010] Furthermore, the drainage cavity is provided with a flow guiding structure, which can be configured as a cavity, groove, hole, protrusion, micro-nano structure or a combination thereof.

[0011] Furthermore, the flow guiding structure includes a flow guiding ring cavity and a flow guiding groove. The isolation wall is provided with a boss on one side of the flow guiding cavity, and multiple flow guiding grooves are provided around the boss. The flow guiding ring cavity is formed between the pump body shell and the boss. The starting point of each flow guiding groove is the flow guiding ring cavity, and the boss is provided with a flow passage hole at the end point of each flow guiding groove.

[0012] Furthermore, the power component includes an impeller and a power source. The power source is used to drive the impeller to rotate. The power source can be any one of electromagnetic drive, magnetic drive, ultrasonic drive, shape memory alloy drive, piezoelectric drive, electrostatic drive, or thermal drive.

[0013] Furthermore, electromagnetic drive includes radial electromagnetic drive and axial electromagnetic drive. The power source of electromagnetic drive includes a rotor unit and a stator unit. The stator unit is used to generate a magnetic field to drive the rotor unit to rotate. The rotor unit is fixedly connected to the impeller.

[0014] In the radial electromagnetic drive method and the axial electromagnetic drive method, the coil winding is a printed circuit board coil, a wire coil, or a combination of both.

[0015] Furthermore, when the power source adopts a radial electromagnetic drive method, the drive cavity is provided with an isolation sleeve, the isolation sleeve is fixedly connected to the isolation wall, a rotor cavity is formed inside the isolation sleeve, and a stator cavity is formed between the outer side of the isolation sleeve and the pump body shell.

[0016] Furthermore, the rotor unit includes a permanent magnet, and the impeller is made of the permanent magnet.

[0017] Furthermore, the stator unit also includes a winding base. In the radial electromagnetic drive mode, the winding base is fixedly disposed in the stator cavity, and the conductor coil winding is wound on the winding base in a distributed winding manner.

[0018] Furthermore, the impeller is made of magnet, ceramic, plastic, metal, glass, carbon fiber, oxide, polymer material, composite material, or a combination of the above materials.

[0019] Furthermore, the flow guiding structure adopts a unidirectional flow guiding structure, including one or more combinations of Tesla valve type, biomimetic structure type, arrow-shaped protrusion type, linear protrusion type, and conical protrusion type.

[0020] Furthermore, each blade of the impeller is provided with a cavity, groove, hole, protrusion, micro / nano structure or a combination thereof.

[0021] Furthermore, the flow guiding structure and the isolation wall are integrally formed, or the flow guiding structure and the isolation wall are separate structures, with the flow guiding structure fixedly connected to the isolation wall.

[0022] Furthermore, a drainage plate is fixedly provided on the top of the boss, and the drainage plate is provided with a plurality of drainage grooves along the circumferential direction.

[0023] Furthermore, the pump housing includes a drainage chamber cover, a first housing, and a drive chamber cover. The isolation wall is disposed inside the first housing. The inlet and outlet are disposed on the first housing. The drainage chamber cover is sealed to the top of the first housing. A drainage chamber is formed between the drainage chamber cover, the isolation wall, and the first housing. The drive chamber cover is fixedly connected to the bottom of the first housing. A drive chamber is formed between the drive chamber cover, the isolation wall, and the first housing.

[0024] Furthermore, the flow guiding structure includes a flow guiding ring cavity, and a boss is provided on one side of the isolation wall for the flow guiding cavity. The flow guiding ring cavity is formed between the pump body shell and the boss. A flow passage is provided in the middle of the boss, and the two ends of the flow passage are respectively connected to the flow guiding ring cavity and the drive cavity.

[0025] Furthermore, the pump body housing includes a second housing, a third housing, and a drive chamber cover;

[0026] The isolation wall is disposed inside the second housing, the liquid inlet and the liquid outlet are disposed on the second housing, and the second housing and the third housing are detachably connected; the top of the isolation wall and the second housing form the drainage cavity, the bottom of the isolation wall has a second recessed cavity at the middle position, the top of the third housing has a third recessed cavity at the middle position, and the bottom of the third housing has a fourth recessed cavity outside the third recessed cavity. The second recessed cavity and the third recessed cavity cooperate to form the driving cavity, the driving cavity cover is fixedly connected to the bottom of the third housing, and the driving cavity cover and the fourth recessed cavity form the stator cavity.

[0027] Furthermore, the flow guiding structure includes a flow guiding ring cavity and flow guiding grooves. The isolation wall has a boss on one side of the flow guiding cavity, and multiple flow guiding grooves are arranged around the boss. A flow guiding ring cavity is formed between the pump body shell and the boss. The starting point of each flow guiding groove is the flow guiding ring cavity. An arc-shaped liquid inlet groove is provided in the middle of the boss. The liquid inlet groove is connected to the drive cavity, and the outer side of the liquid inlet groove is connected to the end point of each flow guiding groove.

[0028] Furthermore, each drainage channel is curved, and multiple curved drainage channels are arranged circumferentially along the boss. One end of each curved drainage channel is connected to the drainage ring cavity, and the other end of each curved drainage channel gradually contracts inward along the circumference until it is connected to the flow hole.

[0029] Furthermore, the flow passage is inclined in the direction of fluid movement and forms an acute angle with the end face of the boss, and the contraction direction of each curved flow channel is consistent with the direction of impeller rotation.

[0030] Furthermore, a circular first concave cavity is provided in the middle of one side of the isolation wall, and multiple flow holes are located in the first concave cavity. A second fluid channel is also provided radially inside the isolation wall. One end of the second fluid channel is connected to the liquid outlet, and the other end of the second fluid channel is connected to the first concave cavity.

[0031] Furthermore, a second limiting ring is provided below the first concave cavity of the isolation wall, and a cup-shaped isolation sleeve is provided below the second limiting ring. The isolation wall is divided into upper and lower parts. The upper part includes a boss and a drainage ring cavity, and the lower part includes an isolation sleeve and a second limiting ring.

[0032] The inner side of the second limiting ring forms a rotor cavity with the isolation wall and the isolation sleeve, and the outer side of the second limiting ring forms a stator cavity with the first housing, the isolation wall and the drive cavity cover. The isolation sleeve forms a seal between the rotor cavity and the stator cavity.

[0033] The beneficial effects of this utility model are:

[0034] The centrifugal pump of this invention has a flow-guiding chamber inside the pump chamber. By constructing an internal flow channel between the pump chambers, the fluid flows into the middle position of the impeller while reducing the thickness of the pump body, thus making better use of the centrifugal drive principle of the centrifugal pump. By setting a flow-guiding structure on the isolation wall, the flow resistance when the fluid enters the inner circumference of the impeller is reduced, thereby improving the efficiency of the centrifugal pump.

[0035] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention can be realized and obtained through the structures pointed out in the description and the accompanying drawings. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 A schematic diagram of a centrifugal pump structure with a specific radial inlet flow channel according to the prior art is shown;

[0038] Figure 2 A schematic diagram of a centrifugal pump according to an embodiment of the present invention is shown;

[0039] Figure 3 An exploded view of a centrifugal pump according to an embodiment of the present invention is shown;

[0040] Figure 4 A schematic diagram of the structure of the drainage cavity cover according to an embodiment of the present invention is shown;

[0041] Figure 5 A schematic diagram of a first structure of the housing drainage cavity side according to an embodiment of the present invention is shown;

[0042] Figure 6 A schematic diagram of a first structure of the housing drive cavity side according to an embodiment of the present invention is shown;

[0043] Figure 7A schematic diagram of the structure of the isolation sleeve according to an embodiment of the present invention is shown;

[0044] Figure 8 A schematic diagram of the impeller according to an embodiment of the present invention is shown;

[0045] Figure 9 A schematic diagram of a second structure of the shell drainage cavity side according to an embodiment of the present invention is shown;

[0046] Figure 10 A schematic diagram of a third structure of the shell drainage cavity side according to an embodiment of the present invention is shown;

[0047] Figure 11 A schematic diagram of a fourth structure of the shell drainage cavity side according to an embodiment of the present invention is shown;

[0048] Figure 12 A schematic diagram of the first type of internal flow channel of the diversion groove according to an embodiment of the present utility model is shown;

[0049] Figure 13 A schematic diagram of a second type of internal flow channel of the diversion groove according to an embodiment of the present invention is shown;

[0050] Figure 14 A schematic diagram of a third type of internal flow channel of the diversion groove according to an embodiment of the present utility model is shown;

[0051] Figure 15 A schematic diagram of a first structure of a stator unit according to an embodiment of the present invention is shown;

[0052] Figure 16 A schematic diagram of a second structure of a stator unit according to an embodiment of the present invention is shown;

[0053] Figure 17 A schematic diagram of the housing structure according to an embodiment of the present invention is shown;

[0054] Figure 18 A schematic diagram of the structure of the upper housing drive cavity side according to an embodiment of the present invention is shown;

[0055] Figure 19 A schematic diagram of the structure of the upper shell drainage cavity side according to an embodiment of the present invention is shown;

[0056] Figure 20 A schematic diagram of the pump housing drainage cavity side according to an embodiment of the present invention is shown.

[0057] In the diagram: 100, Inlet body; 200, Radial inlet channel; 300, Inlet body end face; 400, Inlet interface; 500, Channel body; 1, Pump housing; 2, Isolation wall; 3, Impeller; 4, Power source; 5, Liquid inlet; 6, Liquid outlet; 8, Drive chamber; 9, Drainage chamber; 12, Drainage chamber cover; 13, First housing; 14, Drive chamber cover; 16, Snap ring; 18, Boss; 19, First limiting ring; 20, Snap groove; 21, Drainage ring cavity; 22, First fluid channel; 23, Drainage groove; 24, Flow hole; 25, First concave cavity; 26, Second fluid channel; 27, Second limiting ring; 28, Positioning step; 29, Isolation sleeve; 30, Rotor unit; 31, Stator unit; 32 33. Rotor cavity; 34. Stator cavity; 35. First positioning hole; 36. Second positioning hole; 37. Shaft; 38. Bearing; 39. Permanent magnet; 40. Wheel; 41. Blade; 42. Base plate; 43. First through hole; 44. Second through hole; 45. Wire hole; 46. Liquid inlet pipe; 47. Liquid outlet pipe; 48. Liquid inlet groove; 49. Arrow-shaped protrusion; 50. Linear protrusion; 51. Groove; 52. Arc-shaped protrusion; 53. Symmetrical Tesla valve structure; 54. Main flow channel; 55. Branch flow channel; 56. Fan-shaped structure; 57. Conductor coil winding; 58. Second housing; 59. Protrusion; 60. Recess; 61. Second concave cavity; 62. Third concave cavity; 63. Third housing. Detailed Implementation

[0058] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0059] It should be noted that the terms "first," "second," etc., used in this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," "longitudinal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings.

[0060] This invention provides a centrifugal pump with a flow-guiding cavity structure, which reduces the pump's thickness or axial dimension, lowers fluid flow resistance, and has multiple flow-guiding structures to improve the efficiency of the centrifugal pump.

[0061] like Figure 2 and Figure 3 As shown, a centrifugal pump includes a pump housing 1 and a power unit. The pump housing 1 is provided with an inlet 5 and an outlet 6. The pump housing 1 has a pump chamber inside, which includes a drive chamber 8 and a drainage chamber 9 that are interconnected.

[0062] For example, an isolation wall 2 is provided inside the pump chamber, which divides the pump chamber into a drive chamber 8 and a drainage chamber 9.

[0063] For example, the isolation wall 2 is arranged laterally along the pump body housing 1. For example, the isolation wall 2 is perpendicular to the center line in the height direction of the pump body housing 1. The isolation wall 2 divides the pump cavity into a driving cavity 8 and a drainage cavity 9 distributed vertically.

[0064] The centrifugal pump of this invention has a drainage chamber 9 inside the pump chamber, which forms an internal flow channel between the drive chamber 8 and the drainage chamber 9, thereby realizing radial liquid inlet and compression of thickness or axial dimension of the centrifugal pump.

[0065] The inlet 5 is connected to the drainage chamber 9, the drainage chamber 9 is connected to the drive chamber 8, and the outlet 6 is connected to the drive chamber 8; the power unit is located in the drive chamber 8.

[0066] Centrifugal pumps draw fluid in from the center based on the principle of centrifugal force. After the fluid is continuously worked on by the blades 40, it flows out from the outlet on the outer periphery. Therefore, if you want to reduce the thickness of the centrifugal pump, the inlet and outlet directions need to be set in a direction parallel to the radial direction of the pump impeller 3.

[0067] For example, the drainage cavity 9 has a flow guiding structure on the isolation wall 2. One end of the flow guiding structure is connected to the liquid inlet 5, and the other end is connected to the drive cavity 8. The flow guiding structure can be configured as a cavity, groove, hole, protrusion, micro-nano structure, or a combination thereof.

[0068] For example, the flow guiding structure can be manufactured together with the isolation wall 2, or it can be a separate structure. The flow guiding structure is fixedly connected to the isolation wall 2 by welding, bonding or other methods.

[0069] This invention improves the efficiency of a centrifugal pump by designing a flow guiding structure in the flow inlet cavity 9 to reduce the flow resistance when the fluid enters the drive cavity 8.

[0070] like Figure 2 As shown, for example, the power component includes an impeller 3 and a power source 4, wherein the impeller 3 and the power source 4 are both disposed in the drive chamber 8, the impeller 3 is located below the isolation wall 2, and the power source 4 is located below the impeller 3. The power source 4 is used to drive the impeller 3 to rotate so as to drive the fluid medium to flow in from the inlet 5 and flow out from the outlet 6.

[0071] For example, the power source 4 and the impeller 3 can be separate units, or the impeller 3 and the power source 4 can be manufactured together.

[0072] For example, the impeller 3 can be made of magnet, ceramic, plastic, metal, glass, carbon fiber, oxide, polymer material, composite material or a combination of the above materials, and the metal material can be stainless steel, alloy, etc.

[0073] like Figure 5 As shown, for example, the flow guiding structure includes a flow guiding ring cavity 21 and a flow guiding groove 23. The isolation wall 2 is provided with a boss 18 on one side of the flow guiding cavity 9, wherein the boss 18 can be circular or other shapes.

[0074] The flow channel 23 is provided on the boss 18, and a flow annular cavity 21 is formed between the pump body shell 1 and the boss 18. The starting point of the flow channel 23 is the flow annular cavity 21, and the boss 18 is provided with a flow hole 24 at the end point of the flow channel 23.

[0075] For example, one or more drainage channels 23 can be provided. When multiple drainage channels 23 are provided, the multiple drainage channels 23 are arranged around the boss 18. The starting point of each drainage channel 23 is the drainage ring cavity 21, and the boss 18 is provided with a flow hole 24 at the end point of each drainage channel 23.

[0076] By setting the flow channel 23, the fluid in the flow annular cavity 21 can be diverted to the flow hole 24, thereby reducing the flow resistance.

[0077] For example, the isolation wall 2 is also provided with a first limiting ring 19 on one side of the drainage cavity 9. The first limiting ring 19 is located between the boss 18 and the pump body shell 1.

[0078] like Figure 5 As shown, for example, the flow guiding structure also includes a first fluid channel 22 arranged radially along the isolation wall 2. One end of the first fluid channel 22 is connected to the liquid inlet 5, and the other end of the first fluid channel 22 is connected to the flow guiding ring cavity 21.

[0079] For example, the boss 18 and the drainage groove 23 are in the form of separate patches. The top of the boss 18 is fixedly provided with a drainage plate, and the drainage plate is provided with multiple drainage grooves 23 along the circumference.

[0080] like Figure 3 As shown, for example, the pump housing 1 includes a drainage chamber cover 12, a first housing 13, and a drive chamber cover 14. An isolation wall 2 is disposed inside the first housing 13. An inlet 5 and an outlet 6 are disposed on the first housing 13. The drainage chamber cover 12 is sealed to the top of the first housing 13. A drainage chamber 9 is formed between the drainage chamber cover 12, the isolation wall 2, and the first housing 13. The drive chamber cover 14 is fixedly connected to the bottom of the first housing 13. A drive chamber 8 is formed between the drive chamber cover 14, the isolation wall 2, and the first housing 13.

[0081] It should be noted that the drainage cavity cover 12, the first housing 13 and the drive cavity cover 14 can be integrally formed or can be separate parts. For example, the drainage cavity cover 12 can be snapped into the first housing 13 and the first housing 13 can be snapped into the drive cavity cover 14.

[0082] like Figure 4 As shown, for example, the bottom of the drainage cavity cover 12 is provided with an annular retaining ring 16, and there is a retaining groove 20 between the first limiting ring 19 and the first housing 13 that matches the annular retaining ring 16. The retaining ring 16 is engaged with the retaining groove 20, and a sealing gasket is also provided in the retaining groove 20 to achieve the sealing between the drainage cavity cover 12 and the first housing 13.

[0083] For example, the isolation wall 2 does not have a boss 18 on one side of the drainage cavity 9. The isolation wall 2 has a flow hole 24 at the center. One end of the first fluid channel is connected to the liquid inlet 5, and the other end of the first fluid channel 22 is connected to the flow hole 24. The liquid enters the first fluid channel 22 from the liquid inlet 5 and converges at the flow hole 24, thereby changing the liquid inlet direction to the horizontal direction.

[0084] like Figure 20 As shown, for example, no flow channel 23 is provided on the boss 18. The flow guiding structure includes a flow guiding ring cavity 21. A flow guiding ring cavity 21 is formed between the pump body shell 1 and the boss 18. A plurality of flow holes 24 are provided in the middle position of the boss 18. For example, the plurality of flow holes 24 are distributed in a circle. The two ends of the flow holes 24 are respectively connected to the flow guiding ring cavity 21 and the drive cavity 8.

[0085] like Figure 17 , Figure 18 and Figure 19 As shown, for example, the pump housing 1 includes a second housing 58, a third housing 63, and a drive chamber cover 14. The isolation wall 2 is disposed inside the second housing 58, and the liquid inlet 5 and the liquid outlet 6 are disposed on the second housing 58. The second housing 58 and the third housing 63 are detachably connected, for example, the second housing 58 and the third housing 63 are snapped together. For example, the upper end surface of the third housing 63 is provided with a plurality of arc-shaped protrusions 59 along the circumferential direction, and the corresponding lower end surface of the second housing 58 is provided with a plurality of arc-shaped recesses 60 along the circumferential direction. The protrusions 59 and the recesses 60 are the same size.

[0086] The top of the isolation wall 2 forms a drainage cavity 9 with the second housing 58. A second recess 61 is provided at the middle of the bottom of the isolation wall 2, which is the upper half of the drive cavity 8. For example, the direction of the liquid outlet 6 is tangent to the circumference of the second recess 61. A third recess 62 is provided at the middle of the top of the third housing 63, which is the lower half of the drive cavity 8. A fourth recess (not shown in the figure) is provided at the bottom of the third housing 63 outside the third recess 62. The second recess 61 and the third recess 62 cooperate to form the drive cavity 8. The drive cavity cover 14 is fixedly connected to the bottom of the third housing 63. The drive cavity cover 14 and the fourth recess of the third housing 63 form the stator cavity 33.

[0087] For example, multiple baffles are provided on both sides of each flow channel 23 along the direction of fluid movement. One end of the baffle is connected to the wall of the flow channel 23, and the other end is located in the flow channel of the flow channel 23. The baffle has an angle with the wall of the flow channel 23, which hinders the backflow of fluid.

[0088] For example, multiple drainage channels 23 are evenly distributed around the circumference of the boss 18, multiple flow holes 24 are located in the middle of the boss 18, the arc formed by the connecting lines of the centers of the multiple flow holes 24 is concentric with the boss 18, each drainage channel 23 is arranged radially along the boss 18, the starting point of each drainage channel 23 is the outer side of the boss 18, and the ending point is the flow hole 24.

[0089] For example, the cross-sectional shapes of the multiple drainage channels 23 include, but are not limited to, "semi-circular", "U"-shaped, and "V"-shaped.

[0090] like Figure 9 As shown, for example, multiple drainage channels 23 are evenly distributed around the circumference of the boss 18. The drainage channels 23 are trapezoidal in shape, and the starting point of the drainage channel 23 is the drainage annular cavity 21. Multiple flow holes 24 are connected to the narrow side of the trapezoidal drainage channel 23. As the flow channel in the drainage channel 23 contracts, the fluid velocity gradually increases, which can reduce the backflow of fluid in the drainage channel 23, reduce the friction loss of fluid in the drainage channel 23, and improve the overall efficiency of the centrifugal pump.

[0091] like Figure 10 As shown, for example, the flow guiding structure includes a flow guiding ring cavity 21 and a flow guiding groove 23. The isolation wall 2 is provided with a boss 18 on one side of the flow guiding cavity 9. Multiple flow guiding grooves 23 are arranged around the boss 18. A flow guiding ring cavity 21 is formed between the pump body shell 1 and the boss 18. The starting point of each flow guiding groove 23 is the flow guiding ring cavity 21, but no flow passage hole 24 is provided on the boss 18. An arc-shaped liquid inlet groove 48 is provided in the middle position of the boss 18. The liquid inlet groove 48 is connected to the drive cavity 8. The outer side of the liquid inlet groove 48 is connected to the end point of each flow guiding groove 23.

[0092] like Figure 11As shown, for example, each drainage groove 23 is curved, and multiple curved drainage grooves 23 are evenly distributed around the boss 18. One end of each curved drainage groove 23 is connected to the drainage ring cavity 21, and the other end of each curved drainage groove 23 gradually shrinks inward along the circumference until it is connected to the flow hole 24.

[0093] For example, the flow passage 24 can be configured to be inclined in the direction of fluid movement and form an acute angle with the end face of the boss 18. The contraction direction of each curved flow channel 23 is consistent with the rotation direction of the impeller 3, which can provide the fluid with an axial rotation component and reduce the work done by the impeller 3.

[0094] For example, the flow guiding structure can adopt a unidirectional flow guiding structure, including one or more combinations of Tesla valve type, arrow-shaped protrusion 49, linear protrusion 50, and conical protrusion.

[0095] For example, the flow channel 23 may be equipped with a unidirectional flow guidance structure, including but not limited to a Tesla valve. Preferably, each flow channel 23 is provided with a biomimetic structure to reduce the resistance of the fluid in the inflow direction and increase the resistance of the reverse flow.

[0096] like Figure 12 As shown, for example, the biomimetic structure includes multiple rows of arrow-shaped protrusions 49 connected front to back in the flow channel 23. The arrowheads of the arrow-shaped protrusions 49 point in the same direction as the fluid movement, and the tails of the arrow-shaped protrusions 49 are recessed in the direction of fluid movement, forming a single microstructure. The single microstructures in the same row are connected by linear protrusions 50, the thickness of which is the same as the thickness of the arrow-shaped protrusions 49.

[0097] like Figure 13 As shown, for example, the biomimetic structure includes an array of grooves disposed in the drainage channel 23. In the groove array, there is a gap between two adjacent grooves 51 in each row, and a gap between two adjacent grooves 51 in each column. Each groove 51 has an arc-shaped protrusion 52 at both ends along the fluid movement direction, the direction of which is consistent with the fluid movement direction. The arc-shaped protrusion 52 of the groove 51 is inspired by the microstructure of the surface of the pitcher plant's lip in nature. When liquid is transported in the flow channel of the drainage channel 23, the lateral flow of the liquid is restricted by the boundary, while the arc-shaped protrusion 52 prevents reverse flow, thereby ensuring that the liquid is transported only in the desired direction.

[0098] For example, such as Figure 14As shown, a symmetrical Tesla valve structure 53 is provided in the diversion channel 23. The symmetrical Tesla valve structure 53 includes a straight main channel 54 and arc-shaped diversion channels 55 symmetrically distributed on both sides of the main channel 54. Both ends of the diversion channels 55 are connected to the main channel 54. Each diversion channel 55 has a fan-shaped structure 56 between it and the main channel 54. The diversion channel 55 includes a straight section and an arc section that flow in sequence. When the fluid enters the arc-shaped diversion channel 55 from the straight main channel 54, the outward diffusion force of the fluid causes it to first enter the arc-shaped diversion channel 55 and then flow into the straight main channel 54. By adjusting the distance between the arc-shaped diversion channels 55 on both sides of the main channel 54, it can be changed to an asymmetrical Tesla valve structure 53. The Tesla valve structure can make the resistance of forward flow less than that of reverse flow, forming a "fluid diode" effect.

[0099] For example, a diameter perpendicular to the centerline of the inlet 5 divides the top surface of the boss 18 into two semicircular surfaces. Multiple drainage channels 23 are arranged on the semicircular surface of the boss 18 away from the inlet 5. The inlet 5 is connected to the inlet pipe 46, and the outlet 6 is located on the first housing 13 near the multiple drainage channels 23. The outlet 6 is connected to the outlet pipe 47. For example, the outlet 6 and the inlet 5 are on the same plane.

[0100] For example, the center lines of multiple drainage channels 23 all pass through the center of the top surface of the boss 18. The included angle between the center lines of two adjacent drainage channels 23 is the same. Two adjacent drainage channels 23 form a V-shaped structure. For example, there are 7 drainage channels 23 and 7 flow holes 24. The included angle between the center lines of two adjacent drainage channels 23 is 30°. The 7 drainage channels 23 are evenly distributed on the semicircular surface of the boss 18 away from the liquid inlet 5.

[0101] like Figure 6 As shown, for example, the isolation wall 2 has a circular first concave cavity 25 in the middle of one side of the drive cavity 8, and multiple flow holes 24 are located in the first concave cavity 25. The impeller 3 is located in the first concave cavity 25. The isolation wall 2 also has a second fluid channel 26 arranged radially inside. One end of the second fluid channel 26 is connected to the liquid outlet 6, and the other end of the second fluid channel 26 is connected to the first concave cavity 25.

[0102] like Figure 6 As shown, the isolation wall 2 is provided with a second limiting ring 27 below the first cavity 25. For example, the second limiting ring 27 is concentric with the first cavity 25, and the inner diameter of the second limiting ring 27 is equal to the inner diameter of the first cavity 25.

[0103] The bottom of the first housing 13 is provided with a positioning step 28. The drive cavity cover 14 is interference-fitted with the positioning step 28. The bottom surface of the second limiting ring 27 is flush with the bottom surface of the positioning step 28. The bottom of the drive cavity cover 14 is flush with the bottom of the first housing 13. The top of the drive cavity cover 14 is in contact with the bottom surface of the second limiting ring 27 and the bottom surface of the positioning step 28.

[0104] For example, a cup-shaped isolation sleeve 29 is provided below the second limiting ring 27. The isolation wall 2 is divided into upper and lower parts. The upper part includes a boss 18 and a drainage ring cavity 21, and the lower part includes the isolation sleeve 29 and the second limiting ring 27.

[0105] For example, the electromagnetic drive power source 4 includes a rotor unit 30 and a stator unit 31. The inner side of the second limiting ring 27 forms a rotor cavity 32 with the isolation wall 2 and the isolation sleeve 29. The outer side of the second limiting ring 27 forms a stator cavity 33 with the first housing 13, the isolation wall 2, and the drive cavity cover 14. The rotor unit 30 is disposed inside the rotor cavity 32, and the annular stator unit 31 is disposed inside the stator cavity 33. The isolation sleeve 29 forms a seal between the rotor cavity 32 and the stator cavity 33. The impeller 3 is fixedly connected to the rotor unit 30. When the rotor unit 30 rotates, it drives the impeller 3 to rotate, thereby driving the fluid medium to flow in from the inlet 5 and out from the outlet 6.

[0106] The rotor unit 30 includes a rotating shaft 36, a bearing 37, and a permanent magnet 38. The rotating shaft 36 is supported in the bearing 37, the permanent magnet 38 is fixedly connected to the outer ring of the bearing 37, and the impeller 3 is fixedly connected to the rotating shaft 36.

[0107] For example, the rotor unit 30 adopts a shaft connection method, and a cylindrical first positioning hole 34 is also provided in the first cavity 25. Multiple flow holes 24 are located outside the first positioning hole 34, such as... Figure 7 As shown, the bottom of the isolation sleeve 29 is provided with a second positioning hole 35.

[0108] like Figure 3 As shown, the rotor unit 30 includes a rotating shaft 36, a bearing 37, and a permanent magnet 38. The two ends of the rotating shaft 36 are rotatably connected to the first positioning hole 34 and the second positioning hole 35, respectively. The bearing 37 is sleeved on the outside of the rotating shaft 36, the impeller 3 is sleeved on the outer ring of the bearing 37, and the permanent magnet 38 is disposed at the bottom of the impeller 3.

[0109] The magnetic field of the permanent magnet 38 interacts with the magnetic field generated by the stator unit 31 based on the principle of electromagnetic induction, driving the bearing 37 to rotate, thereby driving the impeller 3 to rotate.

[0110] For example, the rotor unit 30 adopts a shaftless connection method, that is, the rotor unit 30 eliminates the rotating shaft 36. The rotor unit 30 includes a bearing 37 and a permanent magnet 38. The impeller 3 is sleeved on the outside of the bearing 37, and the permanent magnet 38 is set at the bottom of the impeller 3. The impeller 3 is radially fixed to the isolation sleeve 29, which acts as the bearing 37.

[0111] like Figure 8 As shown, for example, the impeller 3 includes a disk 39, blades 40, a circular base plate 41 and a cylindrical base 42. The disk 39 is disposed on the top of the base plate 41, the base 42 is disposed on the bottom of the base plate 41, and multiple blades 40 are provided. The multiple blades 40 are evenly distributed around the disk 39 and are located in the first cavity 25. For example, the blades 40 are cuboid, curved or other shapes.

[0112] For example, the impeller 3 can be made of permanent magnet 38, with the same material as permanent magnet 38, so as to make full use of the magnetic field generated by the stator unit 31.

[0113] Preferably, multiple blades 40 are evenly arranged on the cylindrical disk 39, and each blade 40 is provided with a cavity, groove, hole, protrusion, micro-nano structure or a combination thereof to improve the pump performance. For example, the trailing edge of each blade 40 is serrated. The serrated shape plays a role in breaking down and decomposing the detached vortex, thereby effectively reducing the number of detached vortices and reducing the flow resistance of the fluid in the drive chamber 8.

[0114] For example, each blade 40 has multiple circular or square recesses (not shown in the figure) at the middle position, which serve to reduce flow resistance and alleviate noise.

[0115] A first through hole 43 is provided between the wheel 39, the base plate 41 and the base 42. The bearing 37 is interference-fitted with the first through hole 43, and the annular permanent magnet 38 is sleeved on the base 42.

[0116] For example, the outer diameter of the permanent magnet 38 is equal to the outer diameter of the substrate 41, and the outer diameter of the outer circle formed by the tips of the multiple blades 40 is equal to the outer diameter of the substrate 41.

[0117] The power source 4 is located inside the drive cavity 8. The power source 4 can be configured as any one of electromagnetic drive, magnetic drive, ultrasonic drive, shape memory alloy drive, piezoelectric drive, electrostatic drive, and thermal drive.

[0118] Electromagnetic drive includes radial electromagnetic drive and axial electromagnetic drive. The power source 4 of electromagnetic drive includes rotor unit 30 and stator unit 31. Stator unit 31 is used to generate magnetic field to drive rotor unit 30 to rotate. Rotor unit 30 is fixedly connected to impeller 3.

[0119] For example, in the electromagnetic drive mode, the stator unit 31 includes a conductor coil winding 57 and a winding base. In the radial electromagnetic drive mode, the winding base can be a printed circuit board, a stator core, a silicon steel sheet, or a combination thereof. The winding base is fixedly installed in the stator cavity 33. The conductor coil winding 57 is wound on the winding base in a distributed winding manner. For example, the winding base can be a stator core or other forms.

[0120] In the axial electromagnetic drive method, the stator unit 31 can be in the form of a printed circuit board, a wire coil, or a combination of both. The wire coil winding 57 is fixed on the printed circuit board in a spiral or star shape.

[0121] For example, such as Figure 15 As shown, when the power source 4 adopts a radial electromagnetic drive method, the stator unit 31 includes radially distributed conductor coil windings 57. The conductor coil windings 57 generate an alternating magnetic field to drive the permanent magnet 38. The radial conductor coil windings 57 include printed circuit board coil groups, coil windings, and coil windings uniformly distributed on a circular or other shaped printed circuit board. When the control circuit applies alternating current to the conductor coil windings 57, it generates a radial magnetic field, which drives the permanent magnet 38 to rotate.

[0122] When the power source 4 adopts the radial electromagnetic drive method, the drive cavity 8 is provided with an isolation sleeve 29, the isolation sleeve 29 is fixedly connected to the isolation wall 2, a rotor cavity 32 is formed inside the isolation sleeve 29, and a stator cavity 33 is formed between the outer side of the isolation sleeve 29 and the pump body shell 1.

[0123] For example, such as Figure 16 As shown, in the electromagnetic drive mode, the stator unit 31 can adopt an axially distributed wire coil winding 57, which can generate an axial magnetic field to drive the permanent magnet 38 to rotate. The axial wire coil winding 57 can be a printed circuit board coil group, a copper wire coil group, or a copper wire coil group evenly distributed on a circular or other shaped printed circuit board.

[0124] For example, such as Figure 16 As shown, the axially distributed printed circuit board coil group adopts a spiral or star-shaped distribution. When the control circuit applies alternating current to the wire coil winding 57, it generates a radial magnetic field, which drives the permanent magnet 38 to rotate.

[0125] For example, the permanent magnet 38 is a flat disc or a flat ring, and is placed coaxially and parallel to the stator unit 31. When the control circuit applies alternating current to the conductor coil winding 57, it generates an axial magnetic field, which drives the permanent magnet 38 to rotate.

[0126] like Figure 3As shown, for example, the drive chamber cover 14 has a second through hole 44 in the middle that matches the isolation sleeve 29. The isolation sleeve 29 is located in the second through hole 44, and the bottom surface of the isolation sleeve 29 is flush with the bottom surface of the drive chamber cover 14.

[0127] For example, the drive chamber cover 14 has a fifth recess in the middle that matches the isolation sleeve 29, and the bottom of the isolation sleeve 29 is located in the fifth recess.

[0128] like Figure 6 As shown, for example, the first housing 13 has a through hole 45 at the position of the stator cavity 33. The cables of each winding of the stator unit 31 converge along the bottom of the stator core to form a total winding cable and then connect to the internal circuit of the centrifugal pump. The connecting wires of the internal circuit pass through the through hole 45.

[0129] The internal circuitry of a centrifugal pump includes a detection module and a control circuit. The detection module includes, but is not limited to, temperature and pressure sensors. The temperature measured by the temperature sensor is transmitted to the control circuit, resulting in different heat dissipation effects.

[0130] The fluid medium enters the drainage chamber 9 through the inlet pipe 46, and then enters the drive chamber 8 through the guide structure on the isolation wall 2. Under the high-speed rotation of the impeller 3, it undergoes centrifugal motion. When the medium reaches the outlet 6, it flows out through the outlet pipe 47. After the fluid medium flows out, the pressure in the drive chamber 8 decreases, and the fluid medium in the drainage chamber 9 flows into the drive chamber 8 from the guide structure on the isolation wall 2 under the action of the pressure difference. This motion is repeated to achieve the transportation of the fluid medium.

[0131] The centrifugal pump of this invention can be combined with other components for various application scenarios, including but not limited to mobile phone active cooling devices, laptop cooling systems, drainage devices, drug delivery devices, micro-liquid delivery devices, balloon dilation devices, and battery cooling or heat dissipation systems.

[0132] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A centrifugal pump, characterized in that The application relates to a pump body shell, which is provided with a liquid inlet and a liquid outlet, and has a pump cavity inside the pump body shell, wherein the pump cavity comprises a drainage cavity and a driving cavity which are communicated with each other. The liquid inlet is communicated with the drainage cavity, and the liquid outlet is communicated with the driving cavity. A power component is arranged in the driving cavity. A separation wall is arranged in the pump cavity, and the separation wall separates the pump cavity into the drainage cavity and the driving cavity.

2. The centrifugal pump of claim 1, wherein A flow guide structure is arranged in the drainage cavity, and the flow guide structure is configured as a cavity, a groove, a hole, a protrusion, a micro-nano structure or a combination of the above structures.

3. The centrifugal pump of claim 2, wherein, The flow guide structure comprises a drainage ring cavity and a drainage groove, a boss is arranged on one side of the drainage ring cavity, the drainage groove is arranged on the boss, the drainage ring cavity is formed between the pump body shell and the boss, the starting point of the drainage groove is the drainage ring cavity, and the boss is provided with an overflow hole at the end of the drainage groove.

4. The centrifugal pump of claim 3, wherein, The flow guide structure adopts a one-way flow guide structure, and the one-way flow guide structure comprises one or more combinations of a Tesla valve type, a bionic structure type, an arrow-shaped protrusion type, a linear protrusion type and a conical protrusion type.

5. A centrifugal pump according to claim 3 or 4, characterized in that The power component comprises an impeller and a power source, the power source is used for driving the impeller to rotate, and the power source adopts any one of electromagnetic driving, magnetic driving, ultrasonic driving, memory alloy driving, piezoelectric driving, electrostatic driving and thermal driving.

6. The centrifugal pump of claim 1, wherein, The power source adopting electromagnetic driving comprises a rotor unit and a stator unit, and the stator unit or the rotor unit comprises a coil.

7. The centrifugal pump of claim 6, wherein, The coil is a printed circuit board coil, a wire coil or a combination of the two. When the power source adopts radial electromagnetic driving, the driving cavity is provided with a separation sleeve, the separation sleeve is fixedly connected with the separation wall, the separation sleeve is a rotor cavity, and the stator cavity is formed between the outer side of the separation sleeve and the pump body shell.

8. The centrifugal pump of claim 6, wherein, The rotor unit comprises a permanent magnet, and the impeller is made of the permanent magnet.

9. The centrifugal pump of claim 7, wherein, Cavities, grooves, holes, protrusions, micro-nano structures or combinations of the above structures are arranged on the blades of the impeller.

10. A centrifugal pump according to any of claims 6-9, characterized in that The flow guide structure and the separation wall are integrally formed, or the flow guide structure and the separation wall are split structure and are fixedly connected.

11. The centrifugal pump of claim 4, wherein, A drainage sheet is fixedly arranged on the top of the boss, and a plurality of drainage grooves are arranged on the drainage sheet in the circumferential direction.

12. The centrifugal pump of claim 4, wherein, The pump body shell comprises a drainage cavity cover, a first shell and a driving cavity cover, the separation wall is arranged in the first shell, the liquid inlet and the liquid outlet are arranged on the first shell, the drainage cavity cover is sealingly connected with the top of the first shell, the drainage cavity is formed between the drainage cavity cover, the separation wall and the first shell, the driving cavity cover is fixedly connected with the bottom of the first shell, and the driving cavity is formed between the driving cavity cover, the separation wall and the first shell.

13. The centrifugal pump of claim 2, wherein, The flow guide structure comprises a drainage ring cavity, a boss is arranged on one side of the drainage ring cavity, the drainage ring cavity is formed between the pump body shell and the boss, an overflow hole is arranged at the middle position of the boss, and the two ends of the overflow hole are communicated with the drainage ring cavity and the driving cavity respectively.

14. The centrifugal pump of claim 3, wherein, The pump body shell comprises a second shell, a third shell and a driving cavity cover.

15. The centrifugal pump of claim 2, wherein, ​ The isolation wall is arranged inside the second shell, the liquid inlet and the liquid outlet are arranged on the second shell, and the second shell is detachably connected with the third shell; a top of the isolation wall forms the flow guide cavity with the second shell, a middle position of a bottom of the isolation wall is provided with a second recessed cavity, a middle position of a top of the third shell is provided with a third recessed cavity, and a fourth recessed cavity is arranged outside the third recessed cavity at a bottom of the third shell; the second recessed cavity and the third recessed cavity cooperatively form the driving cavity, a driving cavity cover is fixedly connected with the bottom of the third shell, and the driving cavity cover and the fourth recessed cavity form the stator cavity.

16. The centrifugal pump of claim 2, wherein, The flow guide structure comprises a flow guide ring cavity and flow guide grooves, the isolation wall is provided with a boss on one side of the flow guide ring cavity, and a plurality of flow guide grooves are arranged along the circumference of the boss; the flow guide ring cavity is formed between the pump body shell and the boss, the starting point of each flow guide groove is the flow guide ring cavity, an arc-shaped liquid inlet groove is arranged at the middle position of the boss, the liquid inlet groove is in communication with the driving cavity, and the outer side of the liquid inlet groove is in communication with the ending point of each flow guide groove.

17. The centrifugal pump of claim 4, wherein, Each flow guide groove is in a curve shape, a plurality of curve-shaped flow guide grooves are arranged along the circumference of the boss, one end of each curve-shaped flow guide groove is in communication with the flow guide ring cavity, and the other end of each curve-shaped flow guide groove gradually shrinks inward along the circumference until being in communication with the overflow hole.

18. The centrifugal pump of claim 17, wherein, The overflow hole is arranged to be inclined to the direction of fluid movement and forms an acute angle with the end face of the boss, and the direction of shrinkage of each curve-shaped flow guide groove is consistent with the direction of rotation of the impeller.

19. The centrifugal pump of claim 4, wherein, The isolation wall is provided with a circular first recessed cavity at the middle of one side of the driving cavity, the plurality of overflow holes are located in the first recessed cavity, and a second fluid channel is further arranged in the isolation wall in the radial direction; one end of the second fluid channel is in communication with the liquid outlet, and the other end of the second fluid channel is in communication with the first recessed cavity.

20. The centrifugal pump of claim 19, wherein, The isolation wall is arranged below the first recessed cavity and is provided with a second limiting ring, the lower side of the second limiting ring is provided with a cup-shaped isolation sleeve, and the isolation wall is divided into an upper half and a lower half; the upper half comprises the boss and the flow guide ring cavity, and the lower half comprises the isolation sleeve and the second limiting ring. The inner side of the second limiting ring, the isolation wall and the isolation sleeve form a rotor cavity, the outer side of the second limiting ring, the first shell, the isolation wall and the driving cavity cover form a stator cavity, and the isolation sleeve forms a seal between the rotor cavity and the stator cavity.

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