Miniature liquid-cooled spherical motor pump

Abstract

The patent discloses a micro liquid cooling spherical motor pump, a cylinder cover (1) and an upper part of a cylinder body surround to form a spherical inner cavity, a spherical rotor is arranged in the spherical inner cavity, a rotating disc shaft of the spherical rotor extends into a motor cavity of a lower part of the cylinder body through a through hole of a lower part of the spherical inner cavity, and the rotating disc shaft is used as a motor shaft; an outer iron core is fixed on an outer periphery of the rotating disc shaft to form a motor rotor (8), a motor stator (7) is arranged in the motor cavity; a first bearing sleeve (9) is arranged below the rotating disc shaft, and an overflow groove (901) is arranged on the first bearing sleeve (9); a backflow channel is formed on the pump shell, a dynamic sealing ring of the rotor is cancelled, cooling liquid leaked from a gap between the spherical rotor and the spherical inner cavity flows into the motor cavity, and then flows back to a liquid inlet pipe (101) through a gap between the motor stator (7) and the motor rotor (8), the overflow groove (901) and the backflow channel, so that an internal closed loop circulation loop is formed; the motor pump has the advantages of small size, high efficiency and high reliability.

Description

Technical Field

[0001] This patent relates to a liquid-cooled micro pump, and more particularly to a micro liquid-cooled spherical motor pump. Background Technology

[0002] Currently, liquid cooling active heat dissipation technology is gradually becoming an important development direction in the fields of 3C consumer electronics, edge AI hardware, and robot heat dissipation. Liquid cooling systems rely on micro-pumps to drive the circulation of coolant, achieving heat transfer and dissipation. The micro-pump is the core component of the liquid cooling system. For consumer electronic devices such as mobile phones, laptops, and AR / VR glasses, as well as space-constrained robotic scenarios such as robots and airborne AI computing modules, stringent comprehensive requirements are placed on micro-pumps: they need to be small in size and lightweight, adaptable to the compact installation space inside the device, while possessing a certain output pressure and flow rate, leak-proof liquid, low power consumption, and a long service life.

[0003] As a novel type of positive displacement pump, the spherical pump boasts significant advantages such as small size, light weight, and ease of miniaturization and ultra-miniaturization, as described in Chinese patent number ZL202220285836.0, entitled "A Miniature Spherical Pump." However, conventional spherical pumps require a dynamic seal ring between the turntable shaft and the shaft through-hole to seal the medium in the rotating parts. The dynamic seal ring, due to long-term frictional movement, will experience wear and aging, shortening the overall service life of the pump and increasing the risk of media leakage. In the event of coolant leakage, it directly threatens the safety of precision electronic components and drive elements within consumer electronics and robots. Furthermore, most existing spherical pumps have an independent pump body structure, requiring an additional drive motor for assembly. This separate pump body and motor structure occupies a large space and results in a relatively high overall weight, making it unsuitable for integration into space-constrained devices such as mobile phones, laptops, AR / VR glasses, and robots. Summary of the Invention

[0004] To address the aforementioned problems of existing spherical pumps, this invention provides a miniature liquid-cooled spherical motor pump that integrates the spherical pump and motor design, reducing the volume of the pump and motor units, preventing liquid leakage, reducing power consumption, and improving the reliability and service life of the liquid-cooled spherical pump.

[0005] The technical solution of this patent is as follows: a miniature liquid-cooled spherical motor pump, comprising a shell formed by assembling a cylinder head, a cylinder body, and an end cap. The cylinder head and the upper part of the cylinder body enclose a spherical inner cavity. An inlet pipe and an outlet pipe communicating with the spherical inner cavity are provided on the cylinder head. The lower part of the piston and the upper part of the turntable are hinged by a cylindrical hinge to form a spherical rotor, which is located in the spherical inner cavity. The turntable shaft at the lower part of the turntable passes through a through hole at the lower part of the spherical inner cavity and extends into the motor cavity at the lower part of the cylinder body. The turntable shaft also serves as the motor shaft. The end cap seals the lower end of the motor cavity. An outer iron core is fixed on the outer circumference of the turntable shaft to form the motor rotor. A motor stator is provided in the motor cavity. A first bearing sleeve is arranged below the turntable shaft, and a flow groove is provided on the first bearing sleeve. A return channel is opened on the shell. Coolant leaking from the gap between the spherical rotor and the spherical inner cavity flows into the motor cavity, and flows back to the inlet pipe in sequence through the gap between the motor stator and the motor rotor, the flow groove, and the return channel, forming an internal closed-loop circulation circuit.

[0006] Furthermore, the first bearing sleeve is a ceramic bearing or an engineering plastic bearing, and the flow groove is an axially penetrating groove provided on the inner cylindrical surface of the first bearing sleeve that mates with the turntable shaft. The coolant leaking from the gap between the spherical rotor and the spherical inner cavity flows through the flow groove through the first bearing mating pair, lubricating and cooling the first bearing sleeve at the same time.

[0007] Furthermore, the coolant leaking from the gap between the spherical rotor and the spherical inner cavity flows through the first bearing sleeve and forms a liquid pool on the upper part of the end cover. The lower end of the return channel is connected to the liquid pool, and the upper end is connected to the inlet pipe. A return cooling groove is provided on the inner circumferential surface of the motor cavity and the motor stator in the lower part of the cylinder. The return cooling groove serves as a section of the return channel, and the coolant cools the motor stator when it returns.

[0008] Furthermore, a cylinder head return hole is provided on the cylinder head body, and a cylinder body return hole is provided on the upper part of the cylinder block where it connects with the cylinder head. Multiple return cooling grooves are arranged axially along the inner circumference of the motor cavity. A confluence ring is opened at the upper end of the return cooling groove, which connects the upper ends of the multiple return cooling grooves. The upper end of the motor stator is sealed and fitted to the upper top surface of the motor cavity. The lower end of the cylinder body return hole is connected to the confluence ring. An end cover return groove is provided on the inner side wall of the end cover, which connects to the lower end of the return cooling groove. The cylinder head return hole, cylinder body return hole, confluence ring, return cooling groove, and end cover return groove are sequentially connected to form the return channel.

[0009] Furthermore, reflux holes are respectively provided on the cylinder head, cylinder body, and end cover body. The reflux holes of the cylinder head, cylinder body, and end cover are connected sequentially from top to bottom to form the reflux channel. The lower end of the reflux channel is connected to the liquid accumulation pool on the upper part of the end cover, and the upper end of the reflux channel is connected to the liquid inlet pipe on the cylinder head.

[0010] Furthermore, the dynamic seal ring at the rotation position between the upper part of the turntable shaft and the lower end of the spherical inner cavity was eliminated, allowing the coolant leaking from the gap between the spherical rotor and the spherical inner cavity to enter the motor cavity for cooling and lubrication of the motor interior.

[0011] Furthermore, the motor stator is made of coil windings or a flexible PCB printed circuit board, and its surface is insulated from the coolant.

[0012] Furthermore, a second bearing sleeve is disposed on the upper part of the turntable shaft. An axially penetrating flow groove is provided on the inner cylindrical surface of the second bearing sleeve that mates with the turntable shaft. Coolant leaking from the gap between the spherical rotor and the spherical inner cavity flows into the motor cavity through the flow groove of the second bearing sleeve, lubricating and cooling the second bearing sleeve at the same time as it flows through.

[0013] Furthermore, the turntable is a split-type turntable, which is composed of a turntable body and a turntable shaft. The turntable body and the turntable shaft are two independent parts. A snap-fit ​​groove is provided in the center of the spherical surface below the turntable body, and a snap-fit ​​connector is provided at the upper end of the turntable shaft. The turntable shaft is connected to the turntable body by snap-fit.

[0014] Furthermore, the motor pump is composed of an upper half and a lower half joined together. The upper half is the pump body, and the lower half is the motor. The mating surface of the upper half and the lower half is through a hole in the lower part of the spherical inner cavity of the turntable shaft. The cylinder body is composed of an upper half and a lower half joined together. The return channel is sealed at the mating surface of the upper half and the lower half of the cylinder body. The turntable shaft of the split turntable is installed inside the motor. The upper part of the turntable shaft protrudes from the mating surface between the motor and the pump body. The snap-fit ​​connector of the turntable shaft is inserted upward from the turntable shaft through hole on the pump body into the snap-fit ​​groove in the lower part of the turntable body to connect with the turntable body and drive the turntable to rotate.

[0015] Compared with the prior art, this patent has the following beneficial effects.

[0016] 1) The spherical pump and motor are integrated into one unit. The pump body and motor share the same shaft, which realizes a clever combination of pump and motor structures. This eliminates the need for separate assembly and connection structures between the pump body and motor, greatly reducing the size and weight of the whole machine. It can be adapted to extremely limited installation scenarios such as mobile phones, tablets, AR / VR glasses, and robot joints.

[0017] 2) Eliminating the dynamic seal ring on the rotating part of the ball pump eliminates the potential for media leakage caused by frictional aging of the dynamic seal ring. This fundamentally solves the problem of leakage caused by dynamic seal failure in traditional pumps, preventing coolant leakage from damaging internal precision components and significantly improving the overall reliability of the machine. At the same time, it reduces the large amount of frictional work when the ball pump is running at high speed. Experimental tests show that for ball pumps with a spherical inner cavity diameter of 5 to 8 mm, at a speed of 15,000 to 20,000 revolutions per minute and a flow rate of 200 to 500 ml per minute, frictional work is the main source of power consumption for micro-sized ball pumps. In this case, eliminating the seal ring can reduce the power consumption of the ball pump by more than 50%.

[0018] 3) The coolant, which leaks naturally from the rotor gap of the spherical pump, flows through the gap between the motor stator and rotor, directly cooling both components. The leaked liquid collects in a pool at the bottom of the motor and then returns to the spherical pump inlet via the casing's return channel, forming an internal closed-loop circulation circuit. This circulation fully utilizes the pump's leaking medium to cool the motor without adversely affecting pump efficiency. Simultaneously, the coolant removes heat generated during motor operation, improving heat dissipation.

[0019] 4) The motor uses engineering plastic self-lubricating bearings made of materials such as PEEK. The bearings are immersed in circulating coolant, which achieves self-lubrication by relying on the coolant. This effectively reduces bearing friction and wear, suppresses operating noise, and significantly extends the service life of the bearings and the whole machine, meeting the long-cycle operation requirements of 3C consumer electronics, robots, and end-side equipment. Attached Figure Description

[0020] Figure 1 : Structural diagram of the miniature liquid-cooled spherical motor pump of the first embodiment.

[0021] Figure 2 : Figure 1 Sectional view of AA.

[0022] Figure 3 : Three-dimensional structural diagram of the cylinder head of the first embodiment.

[0023] Figure 4 : Front view of the cylinder block in the first embodiment.

[0024] Figure 5 : Bottom view of the cylinder block in the first embodiment.

[0025] Figure 6 : Three-dimensional structural diagram of the end cap of the first embodiment.

[0026] Figure 7 : Three-dimensional structural diagram of the first embodiment of the sliding groove rotating sleeve.

[0027] Figure 8: Three-dimensional structure diagram of the piston in the first embodiment.

[0028] Figure 9 : Three-dimensional structure diagram of the turntable in the first embodiment.

[0029] Figure 10 : Three-dimensional structural diagram of the first bearing sleeve in the first embodiment.

[0030] Figure 11 : Second embodiment of the micro liquid-cooled spherical motor pump structure diagram.

[0031] Figure 12 : Three-dimensional structural diagram of the cylinder block in the second embodiment.

[0032] Figure 13 : Three-dimensional structural diagram of the end cap of the second embodiment.

[0033] Figure 14 : Third embodiment: Structure diagram of miniature liquid-cooled spherical motor pump.

[0034] Figure 15 : Fourth embodiment: Structure diagram of miniature liquid-cooled spherical motor pump.

[0035] Figure 16 Fifth embodiment: Schematic diagram of the structure of the miniature liquid-cooled spherical motor pump.

[0036] In the diagram: 1. Cylinder head; 101. Inlet pipe; 102. Outlet pipe; 103. Rotary sleeve hole; 104. Cylinder head return hole; 2. Cylinder block; 201. Cylinder block return hole; 202. Combining ring; 203. Return cooling groove; 2a. Cylinder block; 201a. Cylinder block return hole; 2b. Cylinder block; 201b. Cylinder block return hole; 202b. Combining ring; 203b. Return cooling groove; 3. Piston; 301. Slipper; 4. Turntable; 401. Turntable shaft; 4a. Turntable; 401a. Turntable shaft; 4b. Turntable; 401b. Turntable shaft; 5. Slide sleeve; 501. Slide; 6. End cap; 601. Liquid accumulator; 602. End cap return groove; 6a. End cap; 601a. ​​Liquid accumulator; 602a. End cap return hole; 7. Motor stator; 8. Motor rotor; 9. First bearing sleeve; 901. Flow groove; 9a. Second bearing sleeve; 10. Support sleeve; 100. Pump body; 200. Motor body. Detailed Implementation

[0037] For ease of description, the directional terms used in the following embodiments, such as "upper", "upper part", "lower", "lower part", "inner", "outer", "axial", and "radial", are all described with reference to the structure shown in the accompanying drawings. They are only used to facilitate the explanation of the relative positional relationship of each component and do not limit the spatial posture of the micro liquid-cooled spherical motor pump during actual use and installation. Example 1

[0038] like Figure 1 , Figure 2 The diagram shows the structure of the miniature liquid-cooled spherical motor pump in the first embodiment. The pump includes a housing formed by assembling a cylinder head 1, a cylinder body 2, and an end cap 3. The lower part of the cylinder head 1 has a downward-opening hemispherical inner cavity, and the upper part of the cylinder body 2 has an upward-opening hemispherical inner cavity. The cylinder head 1 and the upper part of the cylinder body 2 together form a spherical inner cavity. A motor cavity is formed in the lower part of the cylinder body 2, and the end cap 6 seals the lower end of the cylinder body 2 to close the motor cavity. A through hole is provided in the lower part of the spherical inner cavity, through which the spherical inner cavity communicates with the motor cavity. The cylinder head 1, cylinder body 2, and end cap 6 are injection molded from engineering plastics. Positioning structures are provided at the joints between them. After connection, the butt joints on the outer periphery of the housing are sealed using ultrasonic welding or other methods.

[0039] like Figures 3 to 6 The figures shown are structural diagrams of cylinder head 1, cylinder body 2, and end cap 6 in the first embodiment. A cylinder head return hole 104 is also provided on the body of cylinder head 1, and a rotating hole 103 is also provided on the inner spherical surface of cylinder head 1. An inlet pipe 101 and an outlet pipe 102 communicating with the inner cavity of the spherical cylinder head 1 are provided on cylinder head 1.

[0040] The lower part of piston 3 and the upper part of turntable 4 are hinged together by a cylindrical hinge to form a spherical rotor, which is assembled inside the spherical inner cavity. A turntable shaft 401 extends downward from the lower center of the turntable 4. The turntable shaft 401 passes through a through hole in the lower part of the spherical inner cavity and extends into the motor cavity in the lower part of the cylinder 2. The turntable shaft 401 also serves as the motor shaft. An outer iron core is fixed on the outer circumference of the turntable shaft 401 to form the motor rotor 8. A motor stator 7 is fixed on the inner circumference of the inner cavity. The motor stator 7 is made of coil windings or a flexible PCB printed circuit board, and its surface is insulated from the coolant. In order to reduce the motor diameter, a flexible PCB circuit board is rolled into a cylindrical shape as the motor stator 7. The motor stator 7 is required to have good insulation when immersed in cooling media such as ethylene glycol, water, fluorinated liquid, or other two-phase circulating refrigerants. In addition to the above cooling media, the spherical motor pump of this patent can also use a gas-liquid two-phase medium circulation.

[0041] like Figure 7 The diagram shows a three-dimensional structure of the sliding sleeve 5. The sliding sleeve 5 is cylindrical, with a radially penetrating sliding groove 501 at its lower end. The sliding sleeve 5 is fitted into the sleeve hole 103 and can rotate freely around the axis of the sleeve hole 103. The axis of the sleeve hole 103 and the axis of the turntable shaft 401 both pass through the center of the spherical inner cavity and form an included angle α, where α is between 5 and 35 degrees.

[0042] like Figure 8The diagram shows a three-dimensional structure of piston 3. Piston 3 has a spherical top surface, with a sliding shoe 301 protruding from the center of the spherical top surface. A piston pin seat protrudes from the lower part of piston 3. The piston pin seat has a semi-cylindrical convex structure, with the central axis of the semi-cylindrical convex surface passing through the center of the spherical inner cavity. The two end faces of the piston pin seat are spherical surfaces that fit with the spherical inner cavity and form a sealing dynamic fit. The spherical top surface of piston 3 fits with the spherical inner cavity and forms a sealing dynamic fit. The two parallel sides of sliding shoe 301 are symmetrically arranged on both sides of the central axis of the spherical top surface, passing through the central axis of the spherical surface and parallel to the central axis of the cylindrical hinge. Sliding shoe 301 is assembled in sliding groove 501, with the two parallel sides of sliding shoe fitting with the two parallel sides of sliding groove 501, and can slide back and forth in sliding groove 501.

[0043] like Figure 9 The diagram shows a three-dimensional structure of the turntable 4 in the first embodiment. The turntable 4 has a spherical bottom surface that fits into the spherical inner cavity to form a sealed dynamic fit. A turntable pin seat is recessed in the center of the top surface of the turntable 4. The turntable pin seat has a semi-cylindrical concave structure, and the central axis of the semi-cylindrical concave surface passes through the center of the spherical inner cavity. A turntable shaft 401 protrudes from the center of the spherical bottom surface of the turntable 4. The axis of the turntable shaft 401 is perpendicular to the axis of the semi-cylindrical convex surface of the turntable pin seat and both pass through the center of the spherical inner cavity. A piston pin seat and a turntable pin seat are fitted together. The semi-cylindrical convex surface of the piston pin seat is inserted into the semi-cylindrical concave surface of the turntable pin seat to form the cylindrical hinge, which is a snap-fit ​​structure.

[0044] like Figure 10 The diagram shows a three-dimensional view of the first bearing sleeve structure. A flow groove 901 is axially oriented through the inner cylindrical surface of the first bearing sleeve 9, made of PEEK material. The flow groove 901 consists of four symmetrically arranged semi-circular grooves. The first bearing sleeve 9 is installed at the lower end of the turntable shaft 401. Its function is to provide rotational support for the turntable shaft 401 through the mating of the first bearing sleeve 9 and the spherical surface of the turntable with the spherical inner cavity. The first bearing sleeve 9 can be a conventional ball bearing or a sliding bearing; it can be a ceramic bearing or an engineering plastic bearing. The flow groove 901 can be located on the inner cylindrical surface of the inner ring of the first bearing sleeve 9 that mates with the turntable shaft 401, or on the outer cylindrical surface of the outer ring of the first bearing sleeve 9 that matches the bearing mounting hole, or simultaneously on both the outer and inner cylindrical surfaces of the first bearing sleeve 9. According to the structure of the lower part of the motor cavity and the assembly process requirements, the first bearing sleeve 9 is assembled at the bottom of the motor cavity in the cylinder body through the annular support sleeve 10. The first bearing sleeve 9 is fixedly held in the stepped hole of the support sleeve 10, and the support sleeve 10 is fixedly pressed in the lower part of the motor cavity of the cylinder body 2 through the end cover 6.

[0045] Coolant leaking from the gap between the spherical rotor and the spherical inner cavity enters the motor cavity through the gap between the lower through-hole of the spherical inner cavity and the turntable shaft 401. It then flows downwards through the gap between the motor rotor and stator, and through the flow channel 901 of the first bearing sleeve 9, collecting in the collection pool 601 on the upper part of the end cover 6. The function of the flow channel 901 is to lubricate and cool the first bearing sleeve 7 while allowing coolant to pass through. Experiments have verified that using a PEEK material bushing as a sliding bearing is beneficial for increasing bearing life, reducing friction, and lowering noise during high-speed bearing operation; however, the bearing requires sufficient lubrication and cooling.

[0046] A cylinder head reflux hole 104 is provided on the body of the cylinder head 1, and the cylinder head reflux hole 104 is connected to the liquid inlet pipe 101. A cylinder body reflux hole 201 is provided on the upper part of the cylinder body 2 where it connects with the cylinder head 1. Multiple axially penetrating grooves are provided along the lower cavity of the cylinder body 2 on the inner circumferential surface that fits against the outer wall of the motor stator 7. These axially penetrating grooves are reflux cooling grooves 203. The multiple reflux cooling grooves are arranged along the inner circumference of the motor cavity. In this embodiment, there are 4 evenly distributed reflux cooling grooves 203. A manifold ring 202 is provided at the upper end of cylinder 3, which connects the upper ends of multiple return cooling tanks 203. The outer circumference of the motor stator 7 is arranged opposite to the return cooling tanks 203, forming a coolant channel between the motor stator 7 and the return cooling tanks 203. The function of the return cooling tanks 203 is to cool the motor stator 7 while the coolant flows through. The lower end of the cylinder block return hole 201 is connected to the manifold ring 202. An end cover return groove 602 is provided on the inner side wall of the end cover 6, which is connected to the lower end of the return cooling tanks 203 of the cylinder block 2. The cylinder cover return hole 104, the cylinder block return hole 201, the manifold ring 202, the return cooling tanks 203, and the end cover return groove 602 are connected in sequence to form a return channel. The lower end of the return channel is connected to the liquid collection pool 601 formed on the upper part of the end cover 6, and the upper end of the return channel is connected to the liquid inlet pipe 101 on the cylinder cover 1.

[0047] When assembling the motor stator 7 inside the motor cavity, the following requirements apply: The motor stator 7 can be a motor stator assembly module with mounting components. During installation, its upper end is sealed and fitted to the top surface of the motor cavity, so that the coolant in the annular gap between the motor stator 7 and the electronic rotor 8 cannot directly flow through the annular body of the motor stator 7 and the gap between the upper end of the annular body and the top end face of the motor cavity into the return cooling tank 203. At the same time, the coolant in the return cooling tank 203 cannot flow back through the annular body of the motor stator 7 and the gap between the upper end of the annular body and the top end face of the motor cavity into the annular gap between the motor stator 7 and the motor rotor 8. This ensures that the coolant leaking from the spherical inner cavity enters the motor cavity and flows sequentially through the annular gap between the motor stator 7 and the motor rotor 8, the first bearing sleeve 9, the liquid collection pool 601, and then flows back from the liquid collection pool 601 to the return cooling tank 203, the confluence ring 202, the cylinder block return hole 201, and the cylinder head return hole 104 in a unidirectional flow.

[0048] The working process of the miniature spherical motor pump is as follows: The stator inside the motor cavity drives the motor rotor to rotate. The turntable shaft 401 drives the turntable 4, piston 3 and sliding sleeve 5 to rotate synchronously. The sliding shoe 301 slides back and forth in the sliding groove 501, while driving the sliding sleeve 5 to rotate in the sleeve hole 101. The piston 3 swings relative to the turntable 4, thereby forming two chambers with alternating volumes between the upper end face of the turntable 4, the lower end face of the piston 3 and the spherical surface inside the spherical cavity. The coolant in the liquid cooling circulation pipeline alternately enters the spherical pump through the inlet pipe 101 and connects with the two chambers. It is discharged from the outlet pipe 102 and pressurized back to the liquid cooling system pipeline to provide circulating power for the liquid cooling system.

[0049] Because a return channel is provided on the side wall of the motor pump casing, the coolant leaking from the gap between the spherical rotor and the spherical inner cavity during pump operation flows into the motor cavity, and then flows back to the spherical pump inlet pipe 101 through the gap between the motor stator 7 and the motor rotor 8, the flow groove 901a of the first bearing sleeve 9, the liquid accumulation pool 602, and the return channel, forming an internal closed-loop circulation circuit. This process recovers the leaked coolant, and at the same time cools the motor stator 7 and the motor rotor 8, and cools and lubricates the first bearing sleeve 9.

[0050] This patent differs from traditional spherical pumps in that it eliminates the dynamic seal ring at the rotational position between the upper part of the turntable shaft 401 and the through hole at the lower end of the spherical inner cavity. Cooling and circulation within the motor are achieved through leakage media generated by the gap between the spherical rotors. For micro and ultra-micro spherical pumps, the power consumption is inherently low, ranging from a few milliwatts to a few watts. The power consumption of the seal ring typically accounts for half of the total power consumption of the spherical pump. By eliminating the seal ring, the power consumption generated by friction and wear between the seal ring and the turntable shaft 401 is reduced, thus significantly lowering the power consumption of the spherical pump and extending its service life. To prevent the lack of coolant for lubrication and cooling during pump startup, a portion of coolant is pre-stored in the motor cavity before the new pump is used.

[0051] In this embodiment, the dimensions of the motor pump are: diameter from 4 mm to 12 mm, length from 8 mm to 30 mm; displacement range from 0.0018 to 0.014 ml / rpm; motor speed can reach tens of thousands of rpm; power consumption is in the milliwatt to several watt range; and lifespan can reach over 20,000 hours. It can be used in the cooling fields of mobile phones, tablets, laptops, VR / MR glasses, and robots. The miniature liquid-cooled spherical motor pump mentioned in this patent mainly refers to spherical pumps with a spherical inner cavity diameter of 2 mm to 12 mm, but other sizes are also applicable. Of course, as the diameter of the spherical inner cavity increases, the displacement and power consumption of the motor pump change accordingly. Example 2

[0052] Example 2 is based on Example 1. The only difference between Example 2 and Example 1 is that the structure of the cylinder body and end cap in Example 2 is different from the specific structure of the corresponding cylinder body and end cap in Example 1. All other components are the same as the structure in Example 1. For ease of description, the cylinder body in this example is designated as 2a, and the corresponding cylinder body return hole is designated as 201a; the end cap is designated as 6a, and the corresponding liquid pool and end cap return hole are designated as 601a and 602a, respectively.

[0053] like Figures 11 to 13 As shown, in this embodiment, the return channel is provided on the outer shell body. Flow holes are provided on the cylinder head 1, cylinder body 2a, and end cover 6a. An axially penetrating cylinder body return hole 201a is provided on the side wall of the cylinder body 2a. The upper end of the cylinder body return hole 201a connects to the lower end of the cylinder head return hole 104 of the cylinder head 1. The upper end of the cylinder head return hole 104 is connected to the inlet pipe 101. An annular liquid accumulation pool 601a is provided on the upper end face of the end cover 6a facing the motor cavity. The side wall of the body is provided with an end cap reflux hole 602a. One end of the end cap reflux hole 602a is connected to the liquid accumulation pool 601a, and the other end is connected to the lower end of the cylinder body reflux hole 201a. The outer shell formed by the cylinder cover 1, cylinder body 2a and end cap 6a are fixedly connected in sequence is a fully sealed structure. The cylinder cover reflux hole 104, cylinder body reflux hole 201a and end cap reflux hole 602a are sealed and connected in sequence to form a reflux channel. The lower end of the reflux channel is connected to the liquid accumulation pool 601a, and the upper end of the reflux channel is connected to the liquid inlet pipe 101.

[0054] The reflux channel in Embodiment 2 is set up differently from that in Embodiment 1. In Embodiment 1, the reflux channel consists of an end cover reflux groove 602 set on the side wall of the end cover 6, a reflux cooling groove 203 set on the cylinder body 2, a confluence ring 202, a cylinder head reflux hole 201, and a cylinder head reflux hole 104 set on the cylinder head 1. In Embodiment 1, the reflux channel can cool the outer circumference of the motor stator 7 again during the reflux process, and the overall volume is relatively small. Example 3

[0055] Example 3 is based on Example 1. The only difference between Example 3 and Example 1 is that a second bearing sleeve 9a is added at the through hole at the lower end of the turntable shaft and the spherical inner cavity. The structure of the cylinder and the turntable is different from that in Example 1. All other structures are the same as in Example 1.

[0056] like Figure 14 The diagram shown is a structural diagram of a miniature liquid-cooled spherical motor pump according to the third embodiment. For ease of description, the cylinder body is designated as 2b in this embodiment, and the corresponding cylinder body return hole, manifold ring, and return cooling tank are designated as 201b, 202b, and 203b, respectively; the turntable is designated as 4a, and the corresponding turntable shaft is designated as 401a.

[0057] In this embodiment, a second bearing sleeve 9a is provided between the upper part of the turntable shaft 401a of the turntable 4a and the turntable shaft through hole in the lower part of the spherical inner cavity. The structure of the second bearing sleeve 9a is the same as that of the first bearing sleeve 9, only the size may be different. Its structure can be referred to Figure 10 The second bearing sleeve 9a can be a conventional ball bearing or a sliding bearing, and can be a ceramic bearing or an engineering plastic bearing. Experimental verification has shown that using a PEEK material sleeve as a sliding bearing is beneficial to increasing the bearing's life, reducing friction, and reducing noise during high-speed operation.

[0058] In this embodiment, an axial flow groove is also provided on the second bearing sleeve 9a made of PEEK material. The four semi-circular grooves arranged symmetrically are axially connected and used for the passage of coolant and for cooling and lubricating the second bearing sleeve 9a. The coolant leaking from the gap between the spherical rotor and the spherical inner cavity flows into the motor cavity, passes through the flow groove of the second bearing sleeve 9a, the gap between the motor stator 7 and the motor rotor 8, the flow groove 901 of the first bearing sleeve 9, and the liquid accumulation pool 601, and then flows back to the spherical pump inlet pipe 101 through the return channel, forming an internal closed-loop circulation circuit. In addition, the addition of the second bearing sleeve 9a increases the rotational support of the turntable shaft 401a, increases the rigidity of the turntable shaft 401a, improves the motion accuracy of the turntable 4a, and reduces the wear of the turntable spherical surface and the bearing shaft diameter.

[0059] Although Embodiment 3 is based on Embodiment 1, the addition of a second bearing sleeve 9a at the through hole at the lower end of the spherical inner cavity of the turntable shaft is also suitable for Embodiment 2. The only difference between Embodiment 3 and Embodiment 2 is that the structure of the return channel is different from that in Embodiment 2, and the corresponding structures of the cylinder and end cover are different. Example 4

[0060] Example 4 is based on Example 3. The only difference between Example 4 and Example 3 is the specific structure of the turntable. All other structures are the same as in Example 3.

[0061] like Figure 15 The diagram shows the structure of the miniature liquid-cooled spherical motor pump according to the fourth embodiment. For ease of description, the rotating disk in this embodiment is labeled 4b, and the corresponding rotating disk shaft is labeled 401b. In this embodiment, the rotating disk 4b adopts a split structure, and the rotating disk shaft 401b is an independent shaft. A snap-fit ​​groove is provided in the center of the spherical surface below the rotating disk body, and a snap-fit ​​connector is provided at the upper end of the rotating disk shaft 401b. The rotating disk shaft 401b is connected to the rotating disk body by snap-fit, and the rotating disk is driven to rotate by the rotating disk shaft 401b.

[0062] The advantage of Example 4 over Example 3 is that the turntable and the turntable shaft are connected by a snap-fit, which reduces the machining precision of the turntable and reduces the manufacturing cost.

[0063] Although Example 4 is based on Example 3, its split structure of the turntable, namely the structure of the turntable and the turntable shaft being connected by a snap-fit, is also suitable for Example 2. The only difference is that the structure of the return channel is different in Example 4 and Example 2, and the corresponding structures of the cylinder and end cover are different. Example 5

[0064] Example 5 is based on Example 4. The only difference between Example 5 and Example 4 is the specific structure of the cylinder block; all other structures are the same as in Example 4. For ease of description, the same components in this example still use the reference numerals from Example 4.

[0065] like Figure 16 The diagram shows a schematic of the micro liquid-cooled spherical motor pump structure according to the fifth embodiment. The motor pump is composed of an upper half and a lower half connected together. The upper half is the pump body 100, and the lower half is the motor part 200. The cylinder body is composed of an upper half and a lower half connected together. The motor pump is divided into an upper half and a lower half by the MM plane shown in the figure. The mating surface MM of the upper half and the lower half passes through the through hole of the turntable shaft in the lower part of the spherical inner cavity. The return channel is sealed and connected at the mating surface of the upper half and the lower half of the cylinder body. During assembly, the turntable shaft 401b of the split turntable 4b is located on the motor part 200. The upper end of the turntable shaft 401b protrudes from the motor part 200. The snap connector at the upper end of the turntable shaft 401b is inserted upward from the through hole of the turntable shaft into the snap groove in the lower part of the turntable body and connected to the turntable body, driving the turntable 4b to rotate. A positioning structure is provided at the mating point of the upper half and the lower half of the cylinder body. The outer circumferential seam of the mating point is sealed by welding or other methods.

[0066] The advantage of Embodiment 5 is that the pump body 100 and the motor 200 are two independent parts. The pump body 100 is more inclined towards mechanical manufacturing, which requires a certain level of precision in the machining of parts, while the motor 200 is more inclined towards electrical manufacturing, which requires higher electrical characteristics. In order to arrange production more rationally, the mechanical and electrical parts are allocated to different manufacturing departments or enterprises, thereby improving production efficiency and product quality, achieving specialized production, and reducing manufacturing costs. The assembly of the pump body 100 and the motor 200 does not affect the overall size of the motor pump.

Claims

1. A miniature liquid-cooled spherical motor pump, comprising a cylinder head (1), a cylinder body, and an end cap assembled into a housing, characterized in that: The cylinder head (1) and the upper part of the cylinder body enclose a spherical inner cavity. An inlet pipe (101) and an outlet pipe (102) communicating with the spherical inner cavity are provided on the cylinder head (1). The lower part of the piston (3) and the upper part of the turntable are hinged by a cylindrical hinge to form a spherical rotor, which is located in the spherical inner cavity. The turntable shaft passes through a through hole in the lower part of the spherical inner cavity and extends into the motor cavity in the lower part of the cylinder body. The turntable shaft also serves as the motor shaft. The end cap seals the lower end of the motor cavity. An outer iron is fixed on the outer periphery of the turntable shaft. The motor rotor (8) is formed by the core, and the motor stator (7) is set inside the motor cavity; a first bearing sleeve (9) is arranged below the turntable shaft, and a flow groove (901) is provided on the first bearing sleeve (9); a return channel is opened on the outer shell, and the coolant leaking from the gap between the spherical rotor and the spherical inner cavity flows into the motor cavity, and flows back to the inlet pipe (101) through the gap between the motor stator (7) and the motor rotor (8), the flow groove (901), and the return channel in sequence, forming an internal closed loop circulation circuit.

2. The miniature liquid-cooled spherical motor pump as described in claim 1, characterized in that: The first bearing sleeve (9) is a ceramic bearing or an engineering plastic bearing. The flow groove (901) is an axially penetrating groove provided on the inner cylindrical surface of the first bearing sleeve (9) that mates with the turntable shaft. The coolant leaking from the gap between the spherical rotor and the spherical inner cavity flows through the flow groove (901) through the first bearing mating pair, and lubricates and cools the first bearing sleeve (9) at the same time.

3. A miniature liquid-cooled spherical motor pump as described in claim 1, characterized in that: The coolant leaking from the gap between the spherical rotor and the spherical inner cavity flows through the first bearing sleeve (9) and forms a liquid pool (601) on the upper part of the end cover. The lower end of the return channel is connected to the liquid pool (601), and the upper end is connected to the liquid inlet pipe (101). A return cooling groove (203) is provided on the inner circumferential surface of the motor cavity and the motor stator (7) in the lower part of the cylinder. The return cooling groove (203) serves as a section of the return channel, and the coolant cools the motor stator (7) when it returns.

4. A miniature liquid-cooled spherical motor pump as described in claim 3, characterized in that: A cylinder head reflux hole (104) is provided on the cylinder head (1) body, and a cylinder body reflux hole (201) is provided on the upper part of the cylinder body that is connected to the cylinder head (1). Multiple reflux cooling grooves (203) are arranged axially along the inner circumference of the motor cavity. A confluence ring (202) is opened at the upper end of the reflux cooling groove (203), and the confluence ring (202) connects the upper ends of multiple reflux cooling grooves (203). The upper end of the motor stator (7) is sealed and fitted to the upper top surface of the motor cavity. The lower end of the cylinder body reflux hole (201) is connected to the confluence ring (202). An end cover reflux groove (602) is provided on the inner side wall of the end cover that is connected to the lower end of the reflux cooling groove (203). The cylinder head reflux hole (104), cylinder body reflux hole (201), confluence ring (202), reflux cooling groove (203), and end cover reflux groove (602) are connected in sequence to form the reflux channel.

5. A miniature liquid-cooled spherical motor pump as described in claim 1, characterized in that: A reflux hole is provided on the cylinder head (1), cylinder body and end cover respectively. The cylinder head reflux hole (104), cylinder body reflux hole (201a) and end cover reflux hole (601a) are connected from top to bottom to form the reflux channel. The lower end of the reflux channel is connected to the liquid pool (601a) formed on the upper part of the end cover, and the upper end of the reflux channel is connected to the liquid inlet pipe (101) on the cylinder head (1).

6. A miniature liquid-cooled spherical motor pump as described in any one of claims 1 to 5, characterized in that: The dynamic seal ring at the rotational position of the upper part of the turntable shaft and the through hole at the lower end of the spherical inner cavity has been eliminated. The coolant leaking from the gap between the spherical rotor and the spherical inner cavity enters the motor cavity to cool and lubricate the inside of the motor.

7. A miniature liquid-cooled spherical motor pump as described in any one of claims 1 to 5, characterized in that: The motor stator (7) is made of coil windings or flexible PCB printed circuit boards, and its surface is insulated from the coolant.

8. A miniature liquid-cooled spherical motor pump as described in any one of claims 1 to 5, characterized in that: A second bearing sleeve (9a) is arranged on the upper part of the turntable shaft. An axially penetrating flow groove is provided on the inner cylindrical surface of the second bearing sleeve (9a) that mates with the turntable shaft. The coolant leaking from the gap between the spherical rotor and the spherical inner cavity flows into the motor cavity through the flow groove of the second bearing sleeve (9a). At the same time as the flow, the second bearing sleeve (9a) is lubricated and cooled.

9. A miniature liquid-cooled spherical motor pump according to claim 8, characterized in that: The turntable is a split-type turntable, which is composed of a turntable body and a turntable shaft. The turntable body and the turntable shaft are two independent parts. A snap-fit ​​groove is provided in the center of the spherical surface below the turntable body, and a snap-fit ​​connector is provided at the upper end of the turntable shaft. The turntable shaft is connected to the turntable body by snap-fit.

10. A miniature liquid-cooled spherical motor pump as described in claim 9, characterized in that: The motor pump is composed of an upper part and a lower part connected together. The upper part is the pump body (100), and the lower part is the motor part (200). The mating surface of the upper part and the lower part is connected through the through hole of the turntable shaft in the lower part of the spherical inner cavity. The cylinder is composed of two parts, the upper part and the lower part, connected together. The return channel is sealed and connected at the mating surface of the upper part and the lower part of the cylinder. The turntable shaft of the split turntable is installed in the motor part (200). The upper part of the turntable shaft protrudes from the mating surface of the motor part (200) and the pump body (100). The snap joint of the turntable shaft is inserted upward from the turntable shaft through hole on the pump body (100) into the snap groove at the lower part of the turntable body and connected to the turntable body to drive the turntable to rotate.

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