Ultrathin micro pump driven by axial flux motor and electronic equipment

Abstract

The invention belongs to the related technical field of micro pumps, and discloses an ultrathin micro pump driven by an axial magnetic flux motor and electronic equipment, the micro pump comprises a shell, an impeller, a shaft system and the axial magnetic flux motor, the impeller, the shaft system and the axial magnetic flux motor are arranged in the shell, and the impeller is connected to the shaft system; the axial magnetic flux motor comprises a rotor and a PCB winding which are vertically arranged at an interval, the rotor is embedded in the impeller, the PCB winding comprises a PCB substrate with more than one layer and a controller, the controller is connected to the PCB substrate, and the PCB substrate is of a laminated structure. The axial magnetic flux motor is adopted, the horizontal size of the micro pump is reduced, axial constraint is provided for the impeller through the magnetic pulling force of the axial magnetic flux motor, the PCB winding with the higher integration degree is used, the thickness of the whole micro pump is reduced, and the precision and the integration degree of the whole micro pump are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field related to micro pumps, and more specifically, relates to an ultra-thin micro pump driven by an axial flux motor and an electronic device. Background Art

[0002] With the rapid development of technologies such as 5G communications and artificial intelligence, the power density of electronic devices is growing exponentially. Liquid cooling technology, due to its high thermal capacity and low thermal resistance, has become a core solution to breaking through the chip cooling bottleneck. As the power heart of the liquid cooling system, the performance of the micropump directly determines the cooling efficiency, energy consumption level, and system integration, which in turn affects the adaptability of diverse application scenarios such as data centers and mobile terminals. In areas such as wearable devices and portable mobile terminals, the thickness of the cooling system needs to be compressed to the millimeter level. How to alleviate the performance drop caused by the miniaturization of the micropump has become the key to its application.

[0003] Non-mechanical micropumps are primarily used in microfluidic systems for precise flow control and are not suitable for liquid cooling systems. Piezoelectric micropumps, the most promising non-rotating mechanical micropump, still face challenges with lifespan and reliability. Therefore, existing technologies primarily utilize rotary mechanical micropumps. The thickness of a rotary mechanical micropump (hereinafter referred to as "micropump") is primarily determined by the thickness of both the hydraulic and motor components.

[0004] The micro pumps in the prior art use a vortex pump type and an outer rotor brushless motor (a radial flux motor). The former uses the side-input and side-output characteristics of the vortex pump to compress the thickness of the hydraulic components, while the latter uses the advantage of the outer rotor having a smaller thickness than the inner rotor while providing the same torque to compress the thickness of the motor components. In addition, this technology sets the magnetic center line of the stator core and the rotor magnetic ring as an offset structure, and combines the buoyancy of the liquid and the liquid pressure of the liquid film to axially constrain the rotor. However, the micro pump driven by the radial flux motor has the following defects: 1. The stator and rotor of the radial flux motor are arranged radially and horizontally, occupying a larger radial space, which is not applicable in some scenarios with strict requirements on length and width; 2. The core of the radial flux motor occupies axial and radial space, and the external drive plate increases the thickness of the entire machine and the complexity of assembly. Summary of the Invention

[0005] In response to the above defects or improvement needs of the prior art, the present invention provides an ultra-thin micro pump and electronic equipment driven by an axial flux motor, which aims to solve the problem of the large overall thickness of the existing micro pump.

[0006] To achieve the above objectives, according to one aspect of the present invention, an ultrathin micropump driven by an axial flux motor is provided. The micropump includes a housing, an impeller disposed within the housing, a shaft system, and an axial flux motor, wherein the impeller is connected to the shaft system. The axial flux motor includes a rotor and a PCB winding arranged at intervals above and below, the rotor being embedded in the impeller, the PCB winding including a PCB substrate having a number of layers greater than one and a controller, the controller being connected to the PCB substrate, and the PCB substrate having a stacked structure.

[0007] Furthermore, the PCB substrate includes a multi-layer stacked PCB substrate and copper wires arranged on the PCB substrate, and the copper wires are distributed spiral coils.

[0008] Furthermore, the shell includes a volute and a base, and the volute and the base are connected together by fasteners; a volute cavity is opened at one end of the volute, and a base upper cavity, a first groove and a base lower cavity are respectively opened at both ends of the base, and the base upper cavity and the first groove are located at the same end of the base; an axial hole is opened on the bottom surface of the first groove; the volute cavity, the base upper cavity, the first groove and the axial hole constitute a sealed rotor cavity; the impeller, the rotor and the shaft system are arranged in the rotor cavity.

[0009] Furthermore, the shaft system includes a bearing and a shaft, one end of the shaft is fixed in the shaft hole by interference fit, and the other end is embedded in the inner hole of the bearing; the PCB winding is arranged in the lower cavity of the base.

[0010] Furthermore, a receiving groove is formed at one end of the impeller, and a through bearing hole is opened on the bottom surface of the receiving groove; the bearing is stepped, and its end away from the base is arranged in the bearing hole to provide radial support for the impeller.

[0011] Furthermore, a non-contact gap of 0.05 mm to 3 mm is provided between the impeller and the wall surface of the rotor chamber.

[0012] Furthermore, the rotor is arranged in the receiving groove, and includes a magnetic ring and a motor shell. The magnetic ring is arranged in the motor shell, and the motor shell is arranged adjacent to the groove wall of the receiving groove.

[0013] Furthermore, the rotor of the axial flux motor adopts a neodymium iron boron permanent magnet ring, which is embedded in the interior of the impeller in an alternating NS pole arrangement; two pipe joints are respectively provided on the side of the base, and the two pipe joints are respectively the inlet flow channel and the outlet flow channel. The positions of the inlet flow channel and the outlet flow channel can adjust the inlet and outlet functions according to the rotation direction of the impeller.

[0014] Furthermore, the magnetic field center line corresponding to the PCB winding is aligned with the magnetic pole center line corresponding to the magnetic ring.

[0015] The present invention further provides an electronic device, comprising the ultra-thin micro pump driven by the axial flux motor as described above and a housing, wherein the ultra-thin micro pump is disposed in the housing.

[0016] In general, compared with the prior art, the above technical solutions conceived by the present invention provide an ultra-thin micro pump and electronic device driven by an axial flux motor, which have the following beneficial effects:

[0017] 1. The axial flux motor includes a rotor and a PCB winding spaced apart from each other. The rotor is embedded in the impeller. The PCB winding includes a PCB substrate with more than one layer and a controller. The controller is connected to the PCB substrate. The PCB substrate has a stacked structure. The PCB winding has a high degree of integration, which reduces the thickness of the micro pump and improves the accuracy and integration of the entire machine.

[0018] 2. The planar design of the axial flux motor and PCB winding reduces the overall thickness of the device. The multi-layer PCB winding achieves high torque density within a limited space by superimposing current paths, meeting the high-voltage head requirements of the liquid cooling system.

[0019] 3. A non-contact gap of 0.05mm-3mm is set between the impeller and the wall of the rotor chamber to reduce fluid leakage and eddy current loss.

[0020] 4. The magnetic field centerline of the PCB winding is strictly aligned with the magnetic pole centerline of the magnetic ring. The magnetic pull generated by the axial magnetic flux exerts axial constraint on the impeller. This magnetic pull, combined with the fluid dynamic pressure and the supporting force of the shaft system, ensures that the impeller maintains a non-contact state with the bottom surface of the rotor cavity during operation, preventing mechanical wear. In addition, the low friction coefficient and corrosion resistance of the bearing further enhance the lifespan and reliability of the micropump.

[0021] 5. The ultra-thin micro pump provided by the present invention achieves a highly integrated design of the axial flux motor and the PCB winding, which reduces the thickness of the entire machine to the millimeter level, while improving the assembly accuracy and power density. It is suitable for electronic equipment heat dissipation scenarios with stringent requirements on volume and reliability.

[0022] 6. The magnetic field center line corresponding to the PCB winding is aligned with the magnetic pole center line corresponding to the magnetic ring. The design without magnetic center line offset eliminates the stator and rotor alignment tolerance requirements, reduces processing costs and failure rates, and improves the reliability and assembly accuracy of the entire machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1Schematic diagram of the structure of an ultra-thin micro pump driven by an axial flux motor provided by the present invention;

[0024] Figure 2 yes Figure 1 Cross-sectional view of the ultrathin micropump driven by the axial flux motor in FIG;

[0025] Figure 3 yes Figure 1 Schematic diagram of the axial flux motor of the ultrathin micropump driven by the axial flux motor;

[0026] Figure 4 yes Figure 3 Schematic diagram of the PCB substrate of the axial flux motor.

[0027] In all the drawings, the same reference numerals are used to represent the same elements or structures, wherein: 1-volute, 11-volute cavity, 12-sealing groove, 2-base, 21-base upper cavity, 22-base lower cavity, 3-impeller, 4-shaft system, 41-bearing, 42-shaft, 51-rotor, 511-motor housing, 512-magnetic ring, 52-PCB winding, 521-PCB substrate, 5211-PCB base material, 5212-copper wire, 522-controller, 6-sealing ring, 7-fastener, 8-pipe joint. DETAILED DESCRIPTION

[0028] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0029] See also Figure 1 and Figure 2 The present invention provides an ultra-thin micro pump driven by an axial flux motor. The present invention reduces the horizontal size of the micro pump by adopting an axial flux motor, and uses the magnetic pull of the axial flux motor itself to provide axial constraint on the impeller, and uses a more integrated PCB winding to reduce the thickness of the entire micro pump, thereby improving the accuracy and integration of the entire machine.

[0030] The micro pump includes a housing, an impeller 3 arranged in the housing, a shaft system 4 and an axial flux motor, the impeller 3 is connected to the shaft system 4, and the axial flux motor part is arranged in the impeller 3. The housing includes a volute 1 and a base 2, and the volute 1 and the base 2 are connected together by fasteners 7. Among them, one end of the volute 1 is provided with a volute cavity 11 and a sealing groove 12, and the volute cavity 11 is located in the sealing groove 12. The sealing ring 6 is arranged in the sealing ring 6. The two ends of the base 2 are respectively provided with a base upper cavity 21, a first groove and a base lower cavity 22, and the base upper cavity 21 and the first groove are located at the same end of the base 2. The bottom surface of the first groove is provided with an axial hole. The volute cavity 11, the base upper cavity 21, the first groove and the axial hole constitute a sealed rotor cavity. The sealing ring 6 is used to achieve the sealing of the rotor cavity.

[0031] The shaft system 4 includes a bearing 41 and a shaft 42. One end of the shaft 42 is fixed in the shaft hole by an interference fit, and the other end is embedded in the inner hole of the bearing 41, and axial constraint is achieved by point contact. A receiving groove is formed at one end of the impeller 3, and a through-hole for the bearing 41 is provided on the bottom surface of the receiving groove. The bearing 41 is stepped, and its end away from the base 2 is arranged in the hole of the bearing 41 to provide radial support for the impeller 3. A non-contact gap of 0.05mm-3mm is provided between the impeller 3 and the wall of the rotor cavity to reduce fluid leakage and eddy current loss.

[0032] See also Figure 3 and Figure 4 The axial flux motor includes a rotor 51 and a PCB winding 52. The PCB winding 52 is disposed within the lower cavity 22 of the base 2, and the rotor 51 is disposed within the receiving slot. The rotor 51 includes a magnetic ring 512 and a motor housing 511. The magnetic ring 512 is disposed within the motor housing 511, and the motor housing 511 is disposed adjacent to the wall of the receiving slot.

[0033] In this embodiment, the rotor 51 of the axial flux motor utilizes a neodymium iron boron permanent magnet ring, embedded within the impeller 3 in an alternating N-S pole arrangement, and secured by gluing or overmolding. The axial magnetic flux of the ring 512 interacts with the magnetic field of the PCB winding 52, directly driving the impeller 3 to rotate. The rotor 51 and the PCB winding 52 do not overlap radially.

[0034] The PCB winding 52 includes a PCB substrate 521 with more than one layer and a controller 522, which is connected to the PCB substrate 521. The PCB substrate 521 has a stacked structure, including multiple layers of PCB substrates 5211 and copper wires 5212 disposed on the PCB substrate 5211. The copper wires 5212 are distributed spiral coils that receive drive signals and generate an alternating magnetic field in the PCB winding 52 to interact with the magnetic ring 512.

[0035] Two pipe joints 8 are provided on the sides of the base 2, serving as an inlet and outlet channel, respectively. The positions of the inlet and outlet channels can be adjusted to adjust their inlet and outlet functions according to the rotational direction of the impeller 3. When the controller 522 is energized, the PCB winding 52 generates an alternating magnetic field, driving the magnetic ring 512 to rotate the impeller 3 at high speed. Fluid enters the rotor cavity through the inlet channel, is pressurized by the impeller 3's spiral blades, and is discharged through the outlet channel, forming a continuous liquid cooling cycle.

[0036] The magnetic field centerline of the PCB winding 52 is strictly aligned with the magnetic pole centerline of the magnetic ring 512. The magnetic pull generated by the axial magnetic flux exerts axial constraints on the impeller 3. This magnetic pull, combined with the fluid dynamic pressure and the supporting force of the shafting 4, ensures that the impeller 3 remains in a non-contact state with the bottom surface of the rotor cavity during operation, preventing mechanical wear. Furthermore, the low friction coefficient and corrosion resistance of the bearing 41 further enhance the lifespan and reliability of the micropump.

[0037] The micropump can be embedded in the cooling system of laptops, 5G communication modules or wearable devices, and efficiently dissipates heat through a liquid cooling cycle. Its ultra-thin characteristics are particularly suitable for mobile terminals with limited space, and the anti-vibration design of the PCB winding adapts to high-dynamic working conditions.

[0038] The present invention further provides an electronic device, comprising the ultra-thin micro pump driven by the axial flux motor as described above and a housing, wherein the ultra-thin micro pump is disposed in the housing.

[0039] The ultra-thin micro pump provided by the present invention achieves a highly integrated design of the axial flux motor and the PCB winding, which reduces the thickness of the entire machine to the millimeter level, while improving the assembly accuracy and power density. It is suitable for heat dissipation scenarios of electronic equipment with stringent requirements on volume and reliability.

[0040] It will be easily understood by those skilled in the art that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An ultra-thin micro pump driven by an axial flux motor, characterized in that: The micro pump includes a housing, an impeller arranged in the housing, a shaft system and an axial flux motor, wherein the impeller is connected to the shaft system; the axial flux motor includes a rotor and a PCB winding arranged at intervals above and below, wherein the rotor is embedded in the impeller, and the PCB winding includes a PCB substrate with more than one layer and a controller, wherein the controller is connected to the PCB substrate, and the PCB substrate has a stacked structure.

2. The ultra-thin micro pump driven by an axial flux motor according to claim 1, characterized in that: The PCB substrate includes a multi-layer stacked PCB substrate and copper wires arranged on the PCB substrate, wherein the copper wires are distributed spiral coils.

3. The ultra-thin micro pump driven by an axial flux motor as claimed in claim 2, characterized in that: The shell includes a connected volute and a base, a volute cavity is opened at one end of the volute, and an upper base cavity, a first groove and a lower base cavity are opened at both ends of the base respectively, and the upper base cavity and the first groove are located at the same end of the base; an axial hole is opened on the bottom surface of the first groove; the volute cavity, the upper base cavity, the first groove and the axial hole constitute a sealed rotor cavity; the impeller, the rotor and the shaft system are arranged in the rotor cavity.

4. The ultra-thin micro pump driven by an axial flux motor as claimed in claim 3, characterized in that: The shaft system includes a bearing and a shaft, one end of the shaft is fixed in the shaft hole by interference fit, and the other end is embedded in the inner hole of the bearing; the PCB winding is arranged in the lower cavity of the base.

5. The ultra-thin micro pump driven by an axial flux motor as claimed in claim 3, characterized in that: A receiving groove is formed at one end of the impeller, and a through bearing hole is opened on the bottom surface of the receiving groove; the bearing is stepped, and the end away from the base is arranged in the bearing hole to provide radial support for the impeller.

6. The ultra-thin micro pump driven by an axial flux motor as claimed in claim 5, characterized in that: A non-contact gap of 0.05 mm to 3 mm is provided between the impeller and the wall surface of the rotor chamber.

7. The ultra-thin micro pump driven by an axial flux motor as claimed in claim 5, characterized in that: The rotor is arranged in the receiving groove and includes a magnetic ring and a motor shell. The magnetic ring is arranged in the motor shell, and the motor shell is arranged adjacent to the groove wall of the receiving groove.

8. The ultra-thin micro pump driven by an axial flux motor according to any one of claims 1 to 7, characterized in that: The rotor of the axial flux motor adopts a neodymium iron boron permanent magnet ring, which is embedded in the interior of the impeller in an alternating NS pole arrangement; two pipe joints are respectively provided on the side of the base, and the two pipe joints are respectively an inlet flow channel and an outlet flow channel. The positions of the inlet flow channel and the outlet flow channel can adjust the inlet and outlet functions according to the rotation direction of the impeller.

9. The ultra-thin micro pump driven by an axial flux motor according to claim 7, characterized in that: The magnetic field center line corresponding to the PCB winding is aligned with the magnetic pole center line corresponding to the magnetic ring.

10. An electronic device, characterized in that: The electronic device comprises an ultra-thin micro pump driven by an axial flux motor according to any one of claims 1 to 9 and a housing, wherein the ultra-thin micro pump is arranged in the housing.

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