Micropump and electronic device

Abstract

The invention discloses a micro pump and electronic equipment. The micro pump comprises an impeller assembly, a magnetic part and a coil winding. The magnetic part is connected to the impeller assembly. The coil winding is matched with the magnetic part to generate electromagnetic induction so as to drive the magnetic part and the impeller assembly to rotate, and the impeller assembly rotationally drives the working medium to move. The magnetic part comprises a first magnet, a second magnet and a third magnet, the first magnet and the second magnet are distributed in the first direction, magnetic poles of the first magnet and the second magnet are distributed in the second direction, and the magnetic field directions of the first magnet and the second magnet are opposite. The third magnet is arranged on the same side of the first magnet and the second magnet in the second direction, and magnetic poles of the third magnet are distributed in the first direction and used for concentrating a magnetic field between the first magnet and the second magnet towards the direction close to the third magnet. According to the impeller assembly, the third magnet can concentrate the magnetic field between the first magnet and the second magnet adjacent to each other in the direction close to the third magnet, and the magnetic field in the annular middle area is reduced, so that the magnetic field near the coil winding can be stronger, generation of larger output torque is facilitated, and the efficiency of driving the impeller assembly to rotate is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronic products, in particular to a micro pump and an electronic device. BACKGROUND

[0002] In order to provide good heat dissipation performance for electronic devices, the electronic devices can achieve cooling through built-in liquid cooling heat dissipation systems. The liquid cooling heat dissipation system includes a micro pump, which can provide power for circulating cooling liquid. The micro pump includes a coil, a magnet and a impeller that does work on fluid, the magnet can be connected with the impeller, and the coil generates a torque for driving the magnet to rotate after being electrified, thereby driving the impeller to rotate.

[0003] However, the traditional magnet is usually a single-layer annular structure composed of multiple magnetic units, the magnetic poles of each magnetic unit are distributed in the radial direction of the annular structure, and the magnetic field directions of adjacent two magnetic units are opposite. This design will cause the magnetic field to concentrate in the middle area of the annular structure, which is far away from the coil and difficult to interact with the coil to generate a torque for driving the magnet to rotate, which is not conducive to improving the driving torque of the micro pump. SUMMARY

[0004] Therefore, the present application provides a micro pump and an electronic device to solve the problem that part of the magnetic field generated by the magnet in the existing micro pump is difficult to interact with the coil to generate a torque for driving the magnet to rotate.

[0005] In a first aspect, the present application provides a micro pump, comprising: an impeller assembly, a magnetic member and a coil winding. The impeller assembly is used to drive the working medium to rotate. The magnetic member is connected to the impeller assembly. The magnetic member includes a first magnet, a second magnet and a third magnet, the first magnet and the second magnet are distributed along a first direction, the magnetic poles of the first magnet and the second magnet are distributed along a second direction, and the magnetic field directions of the first magnet and the second magnet are opposite; the third magnet is arranged on the same side of the first magnet and the second magnet along the second direction, the magnetic poles of the third magnet are distributed along the first direction, and the third magnet is used to concentrate the magnetic field between the first magnet and the second magnet towards the direction close to the third magnet. The coil winding is used to generate electromagnetic induction with the magnetic member to drive the magnetic member and the impeller assembly to rotate.

[0006] In the present application, the third magnet can concentrate the magnetic field between the adjacent two first magnets and second magnets towards the direction close to the third magnet, reduce the magnetic field in the middle area of the annular structure, so that the magnetic field near the coil winding is stronger, which is conducive to generating greater output torque and improving the efficiency of driving the impeller assembly to rotate.

[0007] In a possible design, the first end of the third magnet is connected with the first face of the first magnet, and the first end of the third magnet is opposite in polarity to the first face of the first magnet. The second end of the third magnet is connected with the first face of the second magnet, and the second end of the third magnet is opposite in polarity to the first face of the second magnet.

[0008] When the magnetic member and the coil winding cooperate to generate electromagnetic induction, the magnetic field direction is from the N pole of the second magnet to the S pole of the adjacent first magnet, and meanwhile, the S pole of the third magnet cooperating with the first magnet and the second magnet is close to the N pole of the second magnet. According to the principle of "opposites attract", the third magnet can concentrate the magnetic field at the N pole of the second magnet to the third magnet. Similarly, the N pole of the third magnet is close to the S pole of the first magnet, and the third magnet can concentrate the magnetic field at the S pole of the first magnet to the third magnet. Therefore, the third magnet can concentrate the magnetic field between the two adjacent first magnets and the second magnet to the direction close to the third magnet, reduce the magnetic field in the annular middle area, so that the magnetic field near the coil winding can be stronger, which is beneficial to generate greater output torque and improve the efficiency of driving the impeller assembly to rotate.

[0009] In a possible design, the first magnet and the second magnet are each provided with two or more than two, the first magnet and the second magnet are distributed alternately, and the first magnet and the second magnet enclose to form an annulus. The first direction is the circumferential direction of the annulus, and the second direction is the radial direction of the annulus. The third magnet is arranged on the inner side of the first magnet and the second magnet. Wherein, the annulus refers to that the first magnet and the second magnet are distributed along a circumference, and the end of the first magnet and the end of the second magnet can be in contact or can maintain a certain gap. The distributed first magnet and second magnet can make the magnetic member as a whole in a closed annulus or an annulus that is not closed. The annular magnetic member can be uniformly driven in the rotation process, which is beneficial to the stable rotation of the magnetic member.

[0010] In a possible design, the third magnet is provided with a plurality of third magnets, and each third magnet is arranged at the cooperation interface of an adjacent first magnet and a second magnet, so as to adjust the magnetic field between any two adjacent first magnets and second magnets.

[0011] In one possible design, the magnetic component further includes a fourth magnet and a fifth magnet. The fourth magnet is connected to one side of the first magnet along the second direction, and the magnetic field direction of the fourth magnet is the same as that of the first magnet. The fifth magnet is connected to one side of the second magnet along the second direction, and the magnetic field direction of the fifth magnet is the same as that of the second magnet. By stacking the first and fourth magnets, and the second and fifth magnets, the magnetic fields at the first and second magnets can be effectively strengthened, which is beneficial for increasing the output torque.

[0012] In one possible design, the micropump further includes a shaft assembly, an upper cover plate, and a lower cover plate, the lower cover plate being fastened to the upper cover plate. An impeller assembly is disposed between the upper and lower cover plates. The shaft assembly includes a shaft, a bearing, and a limiting member. The limiting member is connected to the lower cover plate and is axially positioned against the shaft. The bearing is disposed between the lower cover plate and the limiting member, one end of the bearing being connected to the lower cover plate and the other end abutting against the limiting member. The shaft is rotatably connected to the bearing and is connected to the impeller assembly.

[0013] During the operation of the micro pump, electromagnetic induction is generated between the magnetic component and the coil winding, causing the magnetic component, impeller assembly, and shaft to rotate synchronously. That is, the bearing remains stationary while the shaft can rotate within it. In this embodiment, by allowing the shaft to rotate within the bearing and fixing the shaft to the impeller assembly, sufficient space is provided between the bearing and the lower cover plate for arranging a limiting component. This limiting component axially limits the bearing, and also, through its cooperation with the shaft, axially limits the shaft, preventing axial wobbling of the impeller assembly caused by the shaft. This effectively avoids friction and noise between the impeller assembly and the upper or lower cover plate.

[0014] In one possible design, an annular groove is provided on the side wall of the rotating shaft. At least a portion of the limiting member extends into the annular groove and engages with the inner wall of the annular groove along the axial direction of the rotating shaft. The limiting member is fixed to the lower cover plate, and the rotating shaft can rotate relative to the limiting member. The limiting member, while limiting the bearing, also provides axial limiting of the rotating shaft through its engagement with the annular groove. This method of engagement between the limiting member and the annular groove is simple, simultaneously limiting both the bearing and the rotating shaft, and is convenient for manufacturing and assembly.

[0015] In one possible design, the lower cover plate is provided with a mounting groove, in which both the bearing and the limiting member are disposed. The limiting member includes a first limiting portion and a second limiting portion, the second limiting portion being connected to the edge of the first limiting portion. The first limiting portion abuts against the end face of the bearing, the second limiting portion abuts against the side of the bearing, and the side of the second limiting portion facing away from the bearing abuts against the inner wall of the mounting groove. At least a portion of the rotating shaft extends out of the mounting groove for connection with the impeller assembly.

[0016] During assembly, the bearing can be installed in the mounting groove first. Then, the second limiting part of the limiting member can be pressed into the space between the side of the bearing and the inner wall of the mounting groove by appropriate external force, so that the second limiting part is reliably clamped between the side of the bearing and the inner wall of the mounting groove. For example, the second limiting part can be clamped between the side of the bearing and the inner wall of the mounting groove by interference fit, thereby ensuring the stability of the bearing in the mounting groove. At the same time, the first limiting part can abut against the end face of the bearing, thereby limiting the bearing in the axial direction, so that the bearing will not move in any direction during the operation of the micro pump.

[0017] In one possible design, the inner wall of the mounting groove is provided with a first protrusion and a second protrusion, the second protrusion protruding beyond the first protrusion. The end face of the bearing facing away from the limiting member abuts against the second protrusion, and the side face of the bearing abuts against the first protrusion. The side face of the bearing abuts against the second surface of the first protrusion, thereby achieving circumferential limiting of the bearing through the first protrusion. The end face of the bearing facing away from the limiting member abuts against the third surface of the second protrusion, thereby achieving reliable support of the bearing through the second protrusion.

[0018] In one possible design, the micro pump further includes a wear-resistant plate disposed axially between the rotating shaft and the lower cover plate, allowing the rotating shaft to contact the wear-resistant plate, thereby reducing wear on the rotating shaft and extending its service life.

[0019] In one possible design, the rotating shaft is welded to the impeller assembly, and the welding connection method can ensure the reliability of the fixed connection between the rotating shaft and the impeller assembly.

[0020] In one possible design, the micropump includes an upper cover and a lower cover, the lower cover being snapped onto the upper cover. An impeller assembly is disposed between the upper and lower cover. The upper cover has a first guide groove, and the lower cover has a second guide groove. The first and second guide grooves align to form a liquid channel, and at least a portion of the impeller assembly is disposed within the liquid channel to drive the flow of the working fluid within the liquid channel.

[0021] In one possible design, the upper cover plate is further provided with a first inlet groove, a first outlet groove, and a first stop; the first inlet groove and the first outlet groove are both connected to the first guide groove, and the first inlet groove and the first outlet groove are separated by the first stop. The lower cover plate is further provided with a second inlet groove, a second outlet groove, and a second stop; the second inlet groove and the second outlet groove are both connected to the second guide groove, and the second inlet groove and the second outlet groove are separated by the second stop. The first inlet groove and the second inlet groove are joined to form an inlet channel, the first outlet groove and the second outlet groove are joined to form an outlet channel, and the first stop and the second stop are sealed together. The impeller assembly has a first gap with the first stop and the second stop, and the parts of the impeller assembly opposite to the first stop and the second stop have second gaps with the upper cover plate and the lower cover plate, respectively.

[0022] The first and second guide channels align to form a liquid channel, with both the inlet and outlet channels communicating with it. The first and second baffles are sealed together to prevent the working fluid from flowing between the inlet and outlet channels. A first gap exists between the impeller blades and the first and second baffles, and second gaps exist between the corresponding portions of the impeller blades and the upper and lower cover plates, respectively. Maintaining these first and second gaps ensures the impeller assembly can rotate normally.

[0023] In one possible design, the widths of both the first gap and the second gap are between 0.05 mm and 0.2 mm. Within this width range, friction between the impeller assembly and the upper or lower cover plate can be avoided, while also preventing the working fluid from flowing between the inlet and outlet channels.

[0024] In one possible design, the upper cover plate is provided with a sealing groove, and a sealing element is provided in the sealing groove. The sealing element includes, but is not limited to, rubber strips, sealant, etc. The upper cover plate is sealed to the lower cover plate through the sealing element, thereby achieving the sealing of the liquid channel and preventing the working fluid in the liquid channel from leaking from the mating interface between the upper cover plate and the lower cover plate.

[0025] Secondly, embodiments of this application also provide an electronic device, comprising a body and a micropump provided in the first aspect of this application, wherein the micropump is disposed within the body. The electronic device including the micropump provided in the first aspect of this application has similar technical effects to the aforementioned micropump, and will not be described in detail here.

[0026] Thirdly, embodiments of this application also provide an electronic device, comprising a first body, a second body, a rotating shaft mechanism, and a micropump provided in the first aspect of this application. The first body is provided with a first heat sink, and the second body is provided with a second heat sink. Both the first and second heat sinks have spaces for storing a working fluid, and the first and second heat sinks are connected via a transaxial conduit. The inlet of the micropump is connected to one of the first and second heat sinks, and the outlet of the micropump is connected to the other of the first and second heat sinks, for circulating the working fluid among the first heat sink, the transaxial conduit, the second heat sink, and the micropump. The electronic device including the micropump provided in the first aspect of this application has similar technical effects to the aforementioned micropump, and will not be described in detail here.

[0027] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit this application. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the structure of an electronic device provided in one embodiment of this application;

[0030] Figure 2 A schematic diagram of the structure of an electronic device provided in another embodiment of this application;

[0031] Figure 3 This is a schematic diagram of the structure of a micropump provided in one embodiment of this application;

[0032] Figure 4 A cross-sectional view of a micropump provided in one embodiment of this application;

[0033] Figure 5 This is a schematic diagram of the impeller assembly in the micropump provided in an embodiment of this application;

[0034] Figure 6 An exploded view of a micropump provided in one embodiment of this application;

[0035] Figure 7 This is a schematic diagram of the structure of the magnetic component in a micropump in related technologies;

[0036] Figure 8This is a top view of the interaction between a magnetic component and a coil in a related technology.

[0037] Figure 9 This is a torque curve diagram of the coil in the related technology;

[0038] Figure 10 A top view of a magnetic component in a micropump provided in one embodiment of this application;

[0039] Figure 11 A magnetic field distribution diagram of a magnetic component in a micropump provided in one embodiment of this application;

[0040] Figure 12 A top view of a magnetic component in a micropump provided in another embodiment of this application;

[0041] Figure 13 A magnetic field distribution diagram of a magnetic component in a micropump provided in another embodiment of this application;

[0042] Figure 14 A torque curve diagram of the coil winding provided in the embodiments of this application;

[0043] Figure 15 This is a schematic diagram of the structure of the upper cover plate in the micro pump provided in the embodiments of this application;

[0044] Figure 16 This is a schematic diagram of the structure of the lower cover plate in the micropump provided in an embodiment of this application;

[0045] Figure 17 A schematic diagram illustrating the fit between the upper and lower cover plates in a micropump provided in an embodiment of this application;

[0046] Figure 18 for Figure 17 Sectional view at point AA;

[0047] Figure 19 for Figure 4 A magnified view at point B;

[0048] Figure 20 A schematic diagram showing the interaction between the rotating shaft assembly and the lower cover plate in the micropump provided in this embodiment of the application;

[0049] Figure 21 This is a schematic diagram showing the fit between the shaft assembly and the impeller assembly in a micropump in related technologies;

[0050] Figure 22 A cross-sectional view of a micropump provided in an embodiment of this application;

[0051] Figure 23 A cross-sectional view of the rotating shaft assembly in the micropump provided in an embodiment of this application;

[0052] Figure 24for Figure 22 Enlarged view at point C;

[0053] Figure 25 This is a partial cross-sectional view of the lower cover plate of the micropump provided in an embodiment of this application.

[0054] Figure label:

[0055] 100 - Electronic devices;

[0056] 100a-Ontology;

[0057] 100b - First Body;

[0058] 100c - Second Body;

[0059] 101 - Miniature pump;

[0060] 101a - Liquid Inlet;

[0061] 101b - Liquid outlet;

[0062] 102 - Heating element;

[0063] 103 - Liquid cooling plate;

[0064] 104 - Rotating shaft mechanism;

[0065] 105 - First heat sink;

[0066] 106 - First heating element;

[0067] 107 - Second heat sink;

[0068] 108 - Second heating element;

[0069] 109 - Cross-axis piping;

[0070] 110-Heat spreader;

[0071] 200 - Magnetic components;

[0072] 201 - First magnetic unit;

[0073] 202 - Second magnetic unit;

[0074] 203 - Central Area;

[0075] 300-coil;

[0076] 1-Top cover plate;

[0077] 11-First guide channel;

[0078] 12-First liquid inlet tank;

[0079] 13-First liquid outlet tank;

[0080] 14-First stop;

[0081] 15-Sealing groove;

[0082] 2-Lower cover plate;

[0083] 21-Second guide channel;

[0084] 22-Second inlet tank;

[0085] 23-Second outlet tank;

[0086] 24 - Second stop;

[0087] 25 - Mounting slot;

[0088] 251 - First protrusion;

[0089] 252 - Second protrusion;

[0090] 2a - Centerline;

[0091] 2b - First surface;

[0092] 2c - Second surface;

[0093] 2d - Third surface;

[0094] 2e- Spacing;

[0095] 3-Impeller assembly;

[0096] 31-Impeller body;

[0097] 32-fan blades;

[0098] 4-Liquid channel;

[0099] 41 - Liquid inlet channel;

[0100] 42 - Liquid outlet channel;

[0101] 5-Magnetic components;

[0102] 51-First Magnet;

[0103] 51a - First page;

[0104] 51b - Second page;

[0105] 52 - Second magnet;

[0106] 52a - First page;

[0107] 52b - Second page;

[0108] 53 - Third Magnet;

[0109] 54 - Fourth Magnet;

[0110] 55 - The Fifth Magnet;

[0111] 6-Coil winding;

[0112] 7-Circuit board;

[0113] 8-Spindle assembly;

[0114] 81-Shaft;

[0115] 811 - Annular groove;

[0116] 812 - Rounded corners;

[0117] 82-Bearing;

[0118] 821 - Shaft hole;

[0119] 83-Limiting component;

[0120] 831 - First limiting part;

[0121] 832 - Second limiting part;

[0122] 85-Spindle;

[0123] 86-Bearing;

[0124] 9-Abrasion-resistant sheet;

[0125] G1 - First gap;

[0126] G2 - Second gap;

[0127] Z-axis. Detailed Implementation

[0128] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0129] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0130] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0131] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0132] In the description of this application, unless otherwise expressly specified and limited, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; unless otherwise specified or explained, the term "multiple" refers to two or more; the terms "connected," "fixed," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, an integral connection, or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0133] Figure 1 This is a schematic diagram of the structure of an electronic device 100 provided in one embodiment of this application. Figure 1 The electronic device 100 shown can be a mobile phone, computer, mobile internet device (MID), wearable device, virtual reality (VR) device, augmented reality (AR) device, robotic arm, camera, robot, or smart home device (such as TV, air conditioner, robot vacuum cleaner, speaker, set-top box), relay, customer premise equipment (CPE), vehicle terminal equipment, etc. The embodiments of this application do not limit the type of electronic device 100.

[0134] Electronic device 100 can be a non-foldable electronic device or a foldable electronic device. For example, Figure 1 The electronic device 100 shown is a non-foldable electronic device. The electronic device 100 may include a body 100a and a micro pump 101. A heating device 102 is disposed in the body 100a, and the micro pump 101 may be disposed in the body 100a.

[0135] The heat-generating device 102 refers to a single device or a module composed of several single devices that has a certain function and can generate heat when working. The heat-generating device 102 includes, but is not limited to, camera modules, sensors, system-on-chip (SOC), charging modules (Charge IC), batteries, system-in-package (SIP) modules, speaker modules, circuit board assemblies, etc.

[0136] The electronic device 100 may also include a liquid cooling plate 103, which can contact the heat-generating device 102. The liquid cooling plate 103 has a space for storing the working fluid, and the micro pump 101 can be connected to the liquid cooling plate 103, enabling the working fluid to circulate between the liquid cooling plate 103 and the micro pump 101, thereby achieving liquid cooling of the heat-generating device 102.

[0137] The working fluid can be a coolant, such as water, ethylene glycol solution, propylene glycol solution, or fluorinated liquid, and may also include a gas. The working fluid can be a single component or a mixture of at least two working fluids (e.g., a mixture of at least two coolants). During flow, the working fluid can remain in a single phase (i.e., without phase change) or be two phases (i.e., changing between liquid and gas phases).

[0138] Figure 2 This is a schematic diagram of the structure of an electronic device 100 provided in another embodiment of this application. Figure 2 The illustrated electronic device 100 is a foldable device, such as a foldable mobile phone or a foldable laptop. The electronic device 100 may include a first body 100b, a second body 100c, a hinge mechanism 104, and a micro pump 101. The first body 100b and the second body 100c are located on opposite sides of the hinge mechanism 104 and are rotatably connected to it, enabling unfolding or folding. The first body 100b may include a first heat sink 105 and a first heating element 106, with the first heat sink 105 dissipating heat from the first heating element 106. The second body 100c may include a second heat sink 107 and a second heating element 108, with the second heat sink 107 dissipating heat from the second heating element 108.

[0139] Both the first heat sink 105 and the second heat sink 107 are provided with spaces for storing working fluid. For example, both the first heat sink 105 and the second heat sink 107 can be the aforementioned liquid cooling plates. The first heat sink 105 and the second heat sink 107 can be connected via a transaxial conduit 109. This transaxial conduit 109 has a certain degree of flexibility and can cross the rotating shaft mechanism 104 to connect with the first heat sink 105 and the second heat sink 107 on both sides of the rotating shaft mechanism 104, allowing the working fluid in the first heat sink 105 and the second heat sink 107 to circulate through the transaxial conduit 109.

[0140] The micro pump 101 can be disposed in the first body 100b or the second body 100c. Figure 2 The illustration exemplarily shows a micro pump 101 disposed in a first body 100b. The inlet 101a of the micro pump 101 is connected to one of the first heat sink 105 and the second heat sink 107, and the outlet 101b of the micro pump 101 is connected to the other of the first heat sink 105 and the second heat sink 107. Figure 2 The illustration exemplarily shows a micropump 101 whose inlet 101a is connected to a first heat sink 105, and its outlet 101b is connected to a second heat sink 107. Alternatively, the micropump 101 can be connected to both the first and second heat sinks 105 via piping. The micropump 101 provides power for the flow of the working fluid, enabling it to circulate among the first heat sink 105, the cross-axis piping 109, the second heat sink 107, and the micropump 101. This allows the first heat sink 105 and the second heat sink 107 to dissipate heat from the first heating element 106 in the first body 100b and the second heating element 108 in the second body 100c, respectively.

[0141] In one embodiment, if the first heat sink 105 or the second heat sink 107 cannot contact the corresponding heat-generating device, heat can also be conducted through the heat spreader 110. For example, as... Figure 2 As shown, when the second heating element 108 in the second body 100c cannot contact the second heat sink 107, in order to improve the heat dissipation efficiency, a heat spreader 110 can be provided in the second body 100c so that the heat spreader 110 can have a large area and can contact the second heat sink 107 and the second heating element 108 at the same time. Thus, heat can be conducted through the heat spreader 110 to improve the heat dissipation efficiency.

[0142] Figure 3 This is a schematic diagram of the structure of a micropump provided in one embodiment of this application, as shown below. Figure 3 As shown, the micro pump may include an upper cover plate 1 and a lower cover plate 2. The upper cover plate 1 may also be referred to as a volute, upper housing, etc., and the lower cover plate 2 may also be referred to as a base. The upper cover plate 1 and the lower cover plate 2 can be interlocked and fixedly connected by bolts.

[0143] Figure 4 A cross-sectional view of a micropump provided in one embodiment of this application, as shown below. Figure 4 As shown, after the upper cover plate 1 and the lower cover plate 2 are fastened together, a liquid channel 4 can be formed between the upper cover plate 1 and the lower cover plate 2.

[0144] like Figure 4 As shown, the upper cover plate 1 can be provided with a sealing groove 15, and a sealing element can be provided in the sealing groove 15. The sealing element includes, but is not limited to, rubber strips, sealant, etc. The upper cover plate 1 is sealed to the lower cover plate 2 through the sealing element, thereby achieving the sealing of the liquid channel 4 and preventing the working fluid in the liquid channel 4 from leaking from the mating interface between the upper cover plate 1 and the lower cover plate 2.

[0145] The micro pump also includes an impeller assembly 3, which may include an impeller body 31 and a fan blade 32. During rotation, the impeller assembly 3 can push the working medium in a set direction through the fan blade 32 to provide the power for the flow of the working medium and realize the circulation of the working medium.

[0146] Figure 5 This is a schematic diagram of the structure of the impeller assembly 3 in the micropump provided in the embodiments of this application, as shown below. Figure 5 As shown, fan blades 32 are arranged around the outer wall of the impeller body 31. Among them, combined with... Figure 4 The impeller assembly 3 can be set between the upper cover plate 1 and the lower cover plate 2. The fan blade 32 can be located in the liquid channel 4. The working fluid can flow in the liquid channel 4. The fan blade 32 pushes the working fluid in a set direction to provide the power for the flow of the working fluid and realize the circulation of the working fluid.

[0147] Figure 6 An exploded view of a micropump provided in one embodiment of this application, as shown below. Figure 6 As shown, the micro pump also includes a magnetic component 5 and a coil winding 6. The magnetic component 5 can be connected to the impeller assembly 3. For example, the magnetic component 5 can be fixed to the impeller assembly 3 by welding or gluing, so that the magnetic component 5 and the impeller assembly 3 can move synchronously.

[0148] The coil winding 6 can be connected to the side of the lower cover plate 2 away from the magnetic component 5, and is used to cooperate with the magnetic component 5 to generate electromagnetic induction, thereby generating torque to drive the magnetic component 5 to rotate, so that the impeller assembly 3 can be driven to rotate synchronously through the magnetic component 5.

[0149] In one embodiment, such as Figure 6As shown, the micro pump may include a circuit board 7, which can be a printed circuit board (PCB) or a flexible printed circuit board (FPC). The circuit board 7 can be connected to the lower cover plate 2, and the coil winding 6 can be electrically connected to the circuit board 7. Drive signals from the electronic equipment can be applied to the coil winding 6 through the circuit board 7 to induce electromagnetic induction between the coil winding 6 and the magnetic component 5. Depending on the drive signal, the impeller assembly 3 can rotate forward or backward.

[0150] Figure 7 This is a schematic diagram of the structure of the magnetic component 200 in a micropump in the related art. In the related art, the magnetic component 200 may include multiple magnetic units. For example, as shown... Figure 7 As shown, the magnetic component 200 may include two first magnetic units 201 and two second magnetic units 202, which are distributed alternately and form a ring.

[0151] Figure 8 This is a top view of the magnetic component 200 mating with the coil 300 in the related art, such as... Figure 8 As shown, the magnetic poles of the two first magnetic units 201 and the two second magnetic units 202 are distributed radially in the ring, and the magnetic poles of an adjacent first magnetic unit 201 and a second magnetic unit 202 are arranged in opposite directions. A significant portion of the magnetic field from each magnetic unit concentrates towards the central region 203 of the ring. To generate a strong electromagnetic induction between the coil 300 and the magnetic component 200, the coil 300 is generally positioned close to each magnetic unit. However, since the central region 203 of the ring is far from the coil 300, if the magnetic field of the magnetic units concentrates towards the central region 203, the magnetic field near the coil 300 will be thinner, resulting in a weaker magnetic field strength and a smaller torque required to drive the magnetic component 200 to rotate.

[0152] Figure 9 This is a torque curve diagram of coil 300 in the related technology, which can correspond to... Figure 8 The magnetic component 200 shown has a structure. (As shown...) Figure 9 As shown, at a rotation speed of 6000 rpm, the maximum torque of coil 300 is 2.09 mN.m and the average torque is 1.56 mN.m, both of which are relatively small.

[0153] In view of this, embodiments of this application provide a micro pump to solve the above-mentioned technical problems.

[0154] The micropump provided in this embodiment includes a magnetic component 5. Figure 10This is a top view of the magnetic component 5 in a micropump provided in one embodiment of this application, as shown below. Figure 10 As shown, the magnetic component 5 includes a first magnet 51, a second magnet 52, and a third magnet 53. The first magnet 51 and the second magnet 52 are distributed along a first direction, and the magnetic poles of the first magnet 51 and the second magnet 52 are distributed along a second direction. The magnetic field directions of the first magnet 51 and the second magnet 52 are opposite. The first magnet 51, the second magnet 52, and the third magnet 53 can be, but are not limited to, ferrite magnets, neodymium iron boron magnets, AlNiCo magnets, etc.

[0155] Multiple first magnets 51 and multiple second magnets 52 can be provided. Figure 10 The illustration exemplarily shows two first magnets 51 and two second magnets 52, which are arranged alternately and form a ring. This ring shape means that the first magnets 51 and the second magnets 52 are distributed along a circumference. The ends of the first magnets 51 and the ends of the second magnets 52 can contact each other or maintain a certain gap. This arrangement of the first magnets 51 and the second magnets 52 can make the magnetic component 5 as a whole either a closed ring or an open ring.

[0156] The first direction mentioned above is the circumferential direction of the ring, and the second direction is the radial direction of the ring. The ring-shaped magnetic component 5 can be subjected to a uniform driving force during rotation, which is beneficial to the stable rotation of the magnetic component 5.

[0157] like Figure 10 As shown, taking the first magnet 51 and the second magnet 52 as an example of being distributed along the circumference, the third magnet 53 is disposed on the same side of the first magnet 51 and the second magnet 52 along the second direction (circumferential direction of the ring). The magnetic poles of the third magnet 53 are distributed along the first direction (circumferential direction of the ring) to concentrate the magnetic field between the first magnet 51 and the second magnet 52 toward the direction closer to the third magnet 53.

[0158] In this configuration, the magnetic poles of adjacent first magnets 51 and second magnets 52 are opposite, thus forming a closed magnetic field between them. For example, taking a ring-shaped magnetic component 5 as an example... Figure 10 As shown, the S pole of the first magnet 51 faces the inner side of the ring, and the N pole faces the outer side of the ring. The N pole of the second magnet 52 faces the inner side of the ring, and the S pole faces the outer side of the ring.

[0159] For ease of explanation, such as Figure 10As shown, a first magnet 51 can be defined as having a first surface 51a and a second surface 51b. The first surface 51a of the first magnet 51 is the side facing the inner side of the ring, and the magnetic pole of the first surface 51a can be the S pole. The second surface 51b of the first magnet 51 is the side facing the outer side of the ring, and the magnetic pole of the second surface 51b can be the N pole. A second magnet 52 also has a first surface 52a and a second surface 52b. The first surface 52a of the second magnet 52 is the side facing the inner side of the ring, and the magnetic pole of the first surface 52a can be the N pole; the second surface 52b of the second magnet 52 is the side facing the outer side of the ring, and the magnetic pole of the second surface 52b can be the S pole.

[0160] A third magnet 53 is disposed inside the first magnet 51 and the second magnet 52. The first end of the third magnet 53 is connected to the first surface 51a of the first magnet 51, and the polarity of the first end of the third magnet 53 is opposite to that of the first surface 51a of the first magnet 51. The second end of the third magnet 53 is connected to the first surface 52a of the second magnet 52, and the polarity of the second end of the third magnet 53 is opposite to that of the first surface 52a of the second magnet 52. For example, as... Figure 10 As shown, the end of the third magnet 53 with the N pole is attached to the side of the first magnet 51 with the S pole, and the end of the third magnet 53 with the S pole is attached to the side of the second magnet 52 with the N pole.

[0161] Among them, such as Figure 10 As shown, when multiple first magnets 51 and second magnets 52 are provided, multiple third magnets 53 can also be provided. Each third magnet 53 is provided at the interface between an adjacent first magnet 51 and a second magnet 52, thereby allowing adjustment of the magnetic field between any two adjacent first magnets 51 and second magnets 52.

[0162] Figure 11 This is a magnetic field distribution diagram of the magnetic component 5 in a micropump provided in one embodiment of this application. Figure 11 The electric field distribution shown can correspond to Figure 10 Magnetic component 5 is shown. (e.g.) Figure 11As shown, when the magnetic component 5 and the coil winding 6 cooperate to generate electromagnetic induction, the magnetic field direction is from the N pole of the second magnet 52 to the S pole of the adjacent first magnet 51. Simultaneously, the S pole of the third magnet 53, which cooperates with the first magnet 51 and the second magnet 52, is close to the N pole of the second magnet 52. According to the principle of "opposites attract," the third magnet 53 can concentrate the magnetic field at the N pole of the second magnet 52 towards itself. Similarly, the N pole of the third magnet 53 is close to the S pole of the first magnet 51, and the third magnet 53 can concentrate the magnetic field at the S pole of the first magnet 51 towards itself. Therefore, the third magnet 53 can concentrate the magnetic field between the two adjacent first magnets 51 and second magnets 52 towards itself, reducing the magnetic field in the middle region of the ring. This results in a stronger magnetic field near the coil winding 6, which is beneficial for generating greater output torque and improving the efficiency of driving the impeller assembly 3.

[0163] Figure 12 A top view of the magnetic component 5 in a micropump provided in another embodiment of this application, as shown below. Figure 12 As shown, the magnetic component 5 also includes a fourth magnet 54 and a fifth magnet 55. Taking the magnetic component 5 as a ring shape as an example, the fourth magnet 54 is connected to one side of the first magnet 51 along the second direction (the radial direction of the ring), and the magnetic field direction of the fourth magnet 54 is the same as that of the first magnet 51. The fifth magnet 55 is connected to one side of the second magnet 52 along the second direction (the radial direction of the ring), and the magnetic field direction of the fifth magnet 55 is the same as that of the second magnet 52.

[0164] For example, such as Figure 12 As shown, the S poles of the fourth magnet 54 and the first magnet 51 both face one side of the inner ring, and the N pole of the fourth magnet 54 is in contact with the S pole of the first magnet 51. The N poles of the fifth magnet 55 and the second magnet 52 both face one side of the inner ring, and the S pole of the fifth magnet 55 is in contact with the N pole of the second magnet 52.

[0165] Therefore, by stacking the first magnet 51 and the fourth magnet 54, and stacking the second magnet 52 and the fifth magnet 55, the magnetic field at the first magnet 51 and the second magnet 52 can be effectively strengthened, which is beneficial to improving the output torque.

[0166] Figure 13 A magnetic field distribution diagram of the magnetic component 5 in a micropump provided in another embodiment of this application. Figure 13 The electric field distribution shown can correspond to Figure 12 Magnetic component 5 is shown. (e.g.) Figure 13As shown, by superimposing a fourth magnet 54 at the first magnet 51 and a fifth magnet 55 at the second magnet 52, the magnetic field strength at the first magnet 51 and the second magnet 52 can be enhanced. At the same time, through the action of the third magnet 53, the magnetic field between two adjacent first magnets 51 and second magnets 52 can be concentrated towards the third magnet 53, reducing the magnetic field in the middle region of the annular magnetic component 5. This makes the magnetic field near the coil winding 6 stronger, which is conducive to generating greater output torque and improving the efficiency of driving the impeller assembly 3 to rotate.

[0167] Figure 14 The torque curve of the coil winding provided in the embodiments of this application can correspond to... Figure 12 The magnetic component 5 shown is structurally similar. Figure 14 As shown, at a rotational speed of 6000 rpm, the maximum torque of the coil is 3.12 mN·m, and the average torque is 2.37 mN·m, relative to... Figure 9 The torque in the related technologies shown in this application embodiment is significantly improved in both maximum torque and average torque, with the maximum torque increased by more than 49% and the average torque increased by more than 51%.

[0168] Figure 15 This is a schematic diagram of the structure of the upper cover plate 1 in the micropump provided in the embodiments of this application, as shown below. Figure 15 As shown, the upper cover plate 1 is provided with a first guide channel 11, a first liquid inlet channel 12, a first liquid outlet channel 13, and a first baffle 14. The first liquid inlet channel 12 and the first liquid outlet channel 13 are both connected to the first guide channel 11, and the first liquid inlet channel 12 and the first liquid outlet channel 13 are separated by the first baffle 14. The first baffle 14 can be a structure integrally formed on the upper cover plate 1.

[0169] Figure 16 This is a schematic diagram of the structure of the lower cover plate 2 in the micropump provided in the embodiments of this application, as shown below. Figure 16 As shown, the lower cover plate 2 is provided with a second guide channel 21, a second inlet channel 22, a second outlet channel 23, and a second stop 24. Both the second inlet channel 22 and the second outlet channel 23 are connected to the second guide channel 21, and are separated by the second stop 24. The second stop 24 can be a structure integrally formed on the lower cover plate 2.

[0170] Figure 17 This is a schematic diagram showing the fit between the upper cover plate 1 and the lower cover plate 2 in the micropump provided in an embodiment of this application. Figure 17 As shown, after the upper cover plate 1 and the lower cover plate 2 are connected, they are combined Figure 15 and Figure 16 The first liquid inlet tank 12 and the second liquid inlet tank 22 are paired to form a liquid inlet channel 41, and the first liquid outlet tank 13 and the second liquid outlet tank 23 are paired to form a liquid outlet channel 42.

[0171] Figure 18 for Figure 17 The sectional view at point AA, as shown Figure 18 As shown, the first guide channel 11 and the second guide channel 21 are joined together to form a liquid channel 4. Figure 17 Both the inlet channel 41 and the outlet channel 42 are connected to the liquid channel 4. The first stop 14 and the second stop 24 are sealed together to block the flow of the working medium between the inlet channel 41 and the outlet channel 42.

[0172] During the operation of the micro pump, the working fluid can enter the liquid channel 4 from the first inlet channel 41. The fan blade 32 in the impeller assembly 3 can be located in the liquid channel 4 to drive the working fluid in the liquid channel 4 to flow faster. The working fluid can flow out from the outlet channel 42 to realize the circulation of the working fluid.

[0173] Figure 19 for Figure 4 The enlarged view at point B, as shown Figure 19 As shown, the impeller assembly 3 has a first gap G1 between the blade 32 and the first stop 14 and the second stop 24, and the parts of the blade 32 of the impeller assembly 3 opposite to the first stop 14 and the second stop 24 have a second gap G2 between them and the upper cover plate 1 and the lower cover plate 2, respectively. By maintaining the first gap G1 and the second gap G2, the impeller assembly 3 can be ensured to rotate normally.

[0174] The first gap G1 and the second gap G2 need to meet certain size ranges. If the width of the first gap G1 and the second gap G2 is too large, the working fluid will flow between the inlet channel 41 and the outlet channel 42 instead of entering the liquid channel 4, and thus will not be pressurized by the impeller assembly 3. If the width of the first gap G1 and the second gap G2 is too small, the impeller assembly 3 will easily rub against the upper cover plate 1 or the lower cover plate 2 during rotation, affecting the normal rotation of the impeller assembly 3 and generating friction noise.

[0175] Therefore, in this embodiment, the widths of both the first gap G1 and the second gap G2 can be between 0.05mm and 0.2mm, for example, 0.05mm, 0.08mm, 0.1mm, 0.13mm, 0.15mm, 0.18mm, or 0.2mm. Within this width range, friction between the impeller assembly 3 and the upper cover plate 1 or the lower cover plate 2 can be avoided, and the working fluid can be prevented from flowing between the inlet channel 41 and the outlet channel 42.

[0176] Figure 20 This is a schematic diagram showing the cooperation between the rotating shaft assembly 8 and the lower cover plate 2 in the micropump provided in the embodiments of this application. Figure 20As shown, the micro pump also includes a shaft assembly 8, which is mounted on the lower cover plate 2, and the impeller assembly 3 can be rotated through the shaft assembly 8.

[0177] Figure 21 This is a schematic diagram illustrating the fit between the shaft assembly and impeller assembly in a micropump in related technologies, such as... Figure 21 As shown, in related technologies, the rotating shaft assembly may include a rotating shaft 85 and a bearing 86. The rotating shaft 85 can be fixedly mounted on the lower cover plate 2, and the bearing 86 is rotatably sleeved on the rotating shaft 85. The bearing 86 is connected to the impeller assembly 3, enabling the bearing 86 and the impeller assembly 3 to rotate synchronously. However, this design makes it difficult to achieve axial positioning of the bearing 86. When the impeller assembly 3 rotates, the centrifugal force generated by the impeller assembly 3 and the buoyancy of the working fluid will cause the bearing 86 to float axially on the rotating shaft 85, which will lead to friction between the impeller assembly 3 and the upper cover plate 1 or the lower cover plate 2, especially in the aforementioned second gap G2 (refer to...). Figure 19 Friction is easily generated at the point where the impeller assembly 3 rotates, which in turn affects the rotation of the impeller assembly 3 and also generates noise.

[0178] Figure 22 A cross-sectional view of the micropump provided in the embodiments of this application, as shown below. Figure 22 As shown, the rotating shaft assembly 8 includes a rotating shaft 81, a bearing 82, and a limiting member 83. One end of the bearing 82 is connected to the lower cover plate 2. For example, the bearing 82 can be placed on the lower cover plate 2 or fixed to it via a connector. The limiting member 83 can be fixed to the lower cover plate 2 and abuts against the end of the bearing 82 away from the lower cover plate 2, thereby clamping the bearing 82 between the limiting member 83 and the lower cover plate 2 to prevent the bearing 82 from wobbling in the axial direction Z. Furthermore, the limiting member 83 can engage with the rotating shaft 81 along the axial direction Z, thereby restricting the axial movement of the rotating shaft 81 in the Z direction. In this embodiment, the bearing 82 can be made of ceramic material. No welding is required between the bearing 82 and the lower cover plate 2, and no welding grooves need to be machined on the ceramic surface of the bearing 82. The bearing 82 is simply fixed by pressing it against the lower cover plate 2 using the limiting member 83, simplifying the process.

[0179] Both the rotating shaft 81 and the bearing 82 can be made of ceramic materials, thereby improving their wear resistance. The rotating shaft 81 is rotatably connected to the bearing 82 and is connected to the impeller assembly 3. The rotating shaft 81 and the impeller assembly 3 can also be fixedly connected, for example, by welding. This welding connection ensures the reliability of the fixed connection between the rotating shaft 81 and the impeller assembly 3. During the operation of the micro pump, electromagnetic induction occurs between the magnetic component 5 and the coil winding 6, causing the magnetic component 5, the impeller assembly 3, and the rotating shaft 81 to rotate synchronously. That is, the bearing 82 remains stationary, while the rotating shaft 81 can rotate within the bearing 82.

[0180] Figure 23 A cross-sectional view of the rotating shaft assembly 8 in the micropump provided in this application embodiment, as shown below. Figure 23 As shown, the bearing 82 is provided with a shaft hole 821, and the rotating shaft 81 is rotatably disposed in the shaft hole 821. There is a tiny gap between the rotating shaft 81 and the inner wall of the shaft hole 821, which can reach the micrometer level, so as to ensure that the rotating shaft 81 can rotate normally and that the deflection of the rotating shaft 81 is within a controllable range.

[0181] Furthermore, defects are prone to occur during the machining process of the rotating shaft 81, resulting in missing parts on the bottom edge of the rotating shaft 81, which in turn causes the rotating shaft 81 to be unstable and prone to wobble. Therefore, in this embodiment, such as Figure 23 As shown, the bottom of the rotating shaft 81 can be provided with a rounded corner 812 to avoid defects during the processing, ensure the uniformity of the rotating shaft 81, and thus ensure the stable rotation of the rotating shaft 81.

[0182] In this embodiment, by enabling the rotating shaft 81 to rotate within the bearing 82 and fixing the rotating shaft 81 to the impeller assembly 3, sufficient space is provided between the bearing 82 and the lower cover plate 2 for arranging the limiting member 83. The limiting member 83 can achieve axial Z-limiting of the bearing 82. At the same time, the limiting member 83 can also achieve axial Z-limiting of the rotating shaft 81 by cooperating with the rotating shaft 81, preventing the rotating shaft 81 from causing axial Z-shaking of the impeller assembly 3, and effectively avoiding friction and noise between the impeller assembly 3 and the upper cover plate 1 or the lower cover plate 2.

[0183] like Figure 23 As shown, an annular groove 811 can be provided on the side wall of the rotating shaft 81. At least a portion of the limiting member 83 extends into the annular groove 811 and is limited and engaged with the inner wall of the annular groove 811 along the axial direction Z of the rotating shaft 81. The limiting member 83 is fixed to the lower cover plate 2, and the rotating shaft 81 can rotate relative to the limiting member 83. While limiting the bearing 82, the limiting member 83 can also limit the axial direction Z of the rotating shaft 81 through its engagement with the annular groove 811. This engagement method between the limiting member 83 and the annular groove 811 is simple, and can simultaneously limit the bearing 82 and the rotating shaft 81, facilitating manufacturing and assembly.

[0184] Figure 24 for Figure 22 The enlarged view at point C, as shown Figure 24 As shown, the lower cover plate 2 is provided with a mounting groove 25, and the bearing 82 and the limiting member 83 are both provided in the mounting groove 25, thereby avoiding the bearing 82 and the limiting member 83 occupying space outside the lower cover plate 2 and improving the integration of the micro pump.

[0185] like Figure 24As shown, at least a portion of the rotating shaft 81 extends out of the mounting groove 25 for connection with the impeller assembly 3. The micro pump also includes a wear-resistant plate 9. Both the wear-resistant plate 9 and the rotating shaft 81 can be made of ceramic. The wear-resistant plate 9 is positioned between the rotating shaft 81 and the lower cover plate 2 along the axial direction Z of the rotating shaft 81. The rotating shaft 81 can contact the wear-resistant plate 9, thereby reducing wear on the rotating shaft 81 and extending its service life.

[0186] like Figure 24 As shown, the limiting member 83 includes a first limiting portion 831 and a second limiting portion 832, with the second limiting portion 832 connected to the edge of the first limiting portion 831. The limiting member 83 can be a one-piece molded structure, meaning that the first limiting portion 831 and the second limiting portion 832 can be formed simultaneously during the manufacturing process of the limiting member 83, thereby simplifying the manufacturing process and improving the structural reliability of the limiting member 83. The first limiting portion 831 abuts against the end face of the bearing 82, the second limiting portion 832 abuts against the side of the bearing 82, and the side of the second limiting portion 832 facing away from the bearing 82 abuts against the inner wall of the mounting groove 25. During assembly, the bearing 82 can be installed in the mounting groove 25 first. Then, the second limiting part 832 of the limiting member 83 can be pressed into the space between the side of the bearing 82 and the inner wall of the mounting groove 25 by appropriate external force, so that the second limiting part 832 is reliably clamped between the side of the bearing 82 and the inner wall of the mounting groove 25. For example, the second limiting part 832 can be clamped between the side of the bearing 82 and the inner wall of the mounting groove 25 by interference fit, thereby ensuring the stability of the bearing 82 in the mounting groove 25. At the same time, the first limiting part 831 can abut against the end face of the bearing 82, thereby limiting the bearing 82 in the axial Z direction, so that the bearing 82 will not move in any direction during the operation of the micro pump.

[0187] Figure 25 This is a partial cross-sectional view of the lower cover plate 2 in the micropump provided in an embodiment of this application, as shown below. Figure 25 As shown, the inner wall of the mounting groove 25 is provided with a first protrusion 251 and a second protrusion 252. Both the first protrusion 251 and the second protrusion 252 protrude from the inner wall of the mounting groove 25, and the second protrusion 252 protrudes from the first protrusion 251. The mounting groove 25 is a circular groove, concentrically arranged with the bearing 82, and has a center line 2a. For ease of explanation, the surface of the mounting groove 25 facing the center line 2a can be defined as the first surface 2b, the surface of the first protrusion 251 facing the center line 2a as the second surface 2c, and the surface of the second protrusion 252 facing the side of the limiting member 83 as the third surface 2d. Figure 24The first surface 2b and the second surface 2c have a certain distance 2e in a direction perpendicular to the center line 2a. This distance 2e can be used to install the second limiting part 832 of the limiting member 83. The second surface 2c and the third surface 2d form an "L" shape. The side of the bearing 82 abuts against the second surface 2c of the first protrusion 251, thereby achieving circumferential limiting of the bearing 82 through the first protrusion 251. The end face of the bearing 82 facing away from the limiting member 83 abuts against the third surface 2d of the second protrusion 252, thereby achieving reliable support of the bearing 82 through the second protrusion 252.

[0188] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A micropump, characterized by The micro pump comprises: a rotor assembly for driving the working medium to rotate; a magnetic element connected to the rotor assembly; the magnetic element comprises a first magnet, a second magnet and a third magnet, the first magnet and the second magnet are distributed along a first direction, the magnetic poles of the first magnet and the second magnet are both distributed along a second direction, and the magnetic field directions of the first magnet and the second magnet are opposite; the third magnet is arranged on the same side of the first magnet and the second magnet along the second direction, the magnetic pole of the third magnet is distributed along the first direction, and the third magnet is used for concentrating the magnetic field between the first magnet and the second magnet towards the direction close to the third magnet; a coil winding for cooperating with the magnetic element to generate electromagnetic induction to drive the magnetic element and the rotor assembly to rotate.

2. The micropump of claim 1, wherein The first end of the third magnet is connected to the first face of the first magnet, and the polarity of the first end of the third magnet is opposite to that of the first face of the first magnet. The second end of the third magnet is connected to the first face of the second magnet, and the polarity of the second end of the third magnet is opposite to that of the first face of the second magnet.

3. The micropump of claim 1, wherein The first magnet and the second magnet are both provided with two or more than two, the first magnet and the second magnet are distributed alternately, and the first magnet and the second magnet enclose to form a ring shape; the first direction is the circumferential direction of the ring shape, and the second direction is the radial direction of the ring shape. The third magnet is arranged on the inner side of the first magnet and the second magnet.

4. The micropump of claim 1, wherein The third magnet is provided with a plurality of third magnets, and each third magnet is arranged at the cooperation interface of an adjacent first magnet and a second magnet.

5. The micropump of claim 1, wherein The magnetic element further comprises a fourth magnet and a fifth magnet, the fourth magnet is connected to one face of the first magnet along the second direction, and the magnetic field direction of the fourth magnet is the same as that of the first magnet; The fifth magnet is connected to one face of the second magnet along the second direction, and the magnetic field direction of the fifth magnet is the same as that of the second magnet.

6. The micropump according to any one of claims 1 to 5, characterized in that The micro pump further comprises an upper cover plate and a lower cover plate, the lower cover plate is buckled to the upper cover plate; the rotor assembly is arranged between the upper cover plate and the lower cover plate; The micro pump further comprises a rotating shaft assembly, the rotating shaft assembly comprises a rotating shaft, a bearing and a limiting element; The limiting element is connected to the lower cover plate, and the limiting element is limited to cooperate with the rotating shaft along the axial direction of the rotating shaft; The bearing is arranged between the lower cover plate and the limiting element, one end of the bearing is connected to the lower cover plate, and the other end of the bearing abuts against the limiting element; The rotating shaft is rotationally connected to the bearing, and the rotating shaft is connected to the rotor assembly.

7. The micropump of claim 6, wherein An annular groove is arranged on the side wall of the rotating shaft, at least part of the limiting element extends into the annular groove, and the limiting element is limited to cooperate with the inner wall of the annular groove along the axial direction of the rotating shaft.

8. The micropump according to claim 6 or 7, characterized in that The lower cover plate is provided with a mounting groove, and the bearing and the limiting element are arranged in the mounting groove; The limiting member comprises a first limiting part and a second limiting part, the second limiting part is connected to the edge of the first limiting part; the first limiting part is in abutment with the end face of the bearing, the second limiting part is in abutment with the side face of the bearing, and the side of the second limiting part away from the bearing is in abutment with the inner wall of the mounting groove; At least part of the rotating shaft extends out of the mounting groove and is used for being connected with the impeller assembly.

9. The micropump of claim 8, wherein, The inner wall of the mounting groove is provided with a first protruding part and a second protruding part, the second protruding part protrudes from the first protruding part, the end face of the bearing away from the limiting member is in abutment with the second protruding part, and the side face of the bearing is in abutment with the first protruding part.

10. The micropump according to any one of claims 6 to 9, characterized in that A wear-resistant sheet is further arranged between the rotating shaft and the lower cover plate along the axial direction of the rotating shaft.

11. The micropump according to any one of claims 6 to 10, characterized in that The rotating shaft is welded with the impeller assembly.

12. The micropump according to any one of claims 1-5, wherein, The micro pump comprises an upper cover plate and a lower cover plate, the lower cover plate is buckled to the upper cover plate; the impeller assembly is arranged between the upper cover plate and the lower cover plate; The upper cover plate is provided with a first flow guide groove, the lower cover plate is provided with a second flow guide groove, the first flow guide groove and the second flow guide groove are matched to form a liquid channel, and at least part of the impeller assembly is arranged in the liquid channel and used for driving the working medium in the liquid channel to flow.

13. The micropump of claim 12, wherein, The upper cover plate is further provided with a first liquid inlet groove, a first liquid outlet groove and a first stopper; the first liquid inlet groove and the first liquid outlet groove are both in communication with the first flow guide groove, and the first liquid inlet groove and the first liquid outlet groove are separated by the first stopper; The lower cover plate is further provided with a second liquid inlet groove, a second liquid outlet groove and a second stopper; the second liquid inlet groove and the second liquid outlet groove are both in communication with the second flow guide groove, and the second liquid inlet groove and the second liquid outlet groove are separated by the second stopper; The first liquid inlet groove and the second liquid inlet groove are matched to form a liquid inlet channel, the first liquid outlet groove and the second liquid outlet groove are matched to form a liquid outlet channel, and the first stopper and the second stopper are in sealed cooperation; The first gap is between the impeller assembly and the first stopper and the second stopper, and the second gap is between the parts of the impeller assembly opposite to the first stopper and the second stopper and the upper cover plate and the lower cover plate.

14. The micropump of claim 13, wherein, The width of the first gap and the second gap is between 0.05mm and 0.2mm.

15. The micropump of claim 12, wherein, The upper cover plate is provided with a sealing groove, a sealing member is arranged in the sealing groove, and the upper cover plate is in sealed connection with the lower cover plate through the sealing member.

16. An electronic device, comprising: The micro pump comprises a body and the micro pump of any one of claims 1-15, and the micro pump is arranged in the body.

17. An electronic device, comprising: The micro pump comprises a first body, a second body, a rotating shaft mechanism and the micro pump of any one of claims 1-15. The first body is provided with a first heat dissipation member, the second body is provided with a second heat dissipation member, spaces for storing working medium are arranged in the first heat dissipation member and the second heat dissipation member, and the first heat dissipation member and the second heat dissipation member are in communication through a cross-shaft pipeline. The liquid inlet of the micro-pump is communicated with one of the first heat radiating member and the second heat radiating member, and the liquid outlet of the micro-pump is communicated with the other of the first heat radiating member and the second heat radiating member, so as to make the working medium circulate between the first heat radiating member, the cross-shaft pipeline, the second heat radiating member and the micro-pump.

Images