Anti-clogging micro pump

Abstract

The present invention provides an anti-clogging micro pump. The micro pump comprises a pump casing, an impeller axially arranged in the pump casing, a guide vane connected to the rear of the pump casing, a driving member arranged at the rear of the guide vane and suitable for driving the impeller to rotate, and a cover casing arranged at the rear of the guide vane; the impeller is suitable for rotating under the drive of the driving member to pump the medium entering the pump casing; the guide vane is suitable for leading the medium pumped by the impeller out of the pump casing; the front end surface of the cover casing is provided with a plurality of centrifugal blades; the rear peripheral side of the guide vane is provided with a guide vane outlet corresponding to at least a plurality of centrifugal blades; the plurality of centrifugal blades are suitable for rotating to lead the medium remaining in the guide vane from the guide vane outlet. By adopting the present invention, the medium remaining in the guide vane can be completely discharged, thereby avoiding the problem of the drive shaft, bearing and other components being stuck, failing, stopping operation and the like due to the accumulation of the medium in the guide vane.

Description

Technical Field

[0001] The invention belongs to the technical field of medical devices, and in particular relates to an anti-clogging micro pump. Background Art

[0002] At present, with the development of the aging population, the number of patients with heart failure has increased significantly compared with the past. Heart failure refers to the disorder of the heart's contractile or diastolic function, which causes the inability to fully discharge venous blood back to the heart, thereby causing blood congestion in the venous system and insufficient blood supply to the arterial system, and ultimately causing a disorder of the heart's circulatory system. In particular, the onset of acute heart failure will not only lead to a decrease in myocardial contractility, a sudden drop in cardiac output, and congestion in the pulmonary circulation, leading to problems such as acute pulmonary congestion and pulmonary edema, but will also cause irreversible damage to various tissues and organs due to insufficient perfusion.

[0003] In recent years, due to the development of minimally invasive interventional technology, minimally invasive left ventricular assist devices have gradually become an important means of treating acute heart failure. Moreover, due to its small trauma and simple surgical procedures, it has quickly become a research hotspot in the cardiovascular field.

[0004] In specific implementation, the minimally invasive left ventricular assist device usually includes a micro pump. However, during use, blood will inevitably accumulate in the micro pump, causing problems such as jamming and stopping of operation. Summary of the invention

[0005] The present invention provides an anti-clogging micro pump. The micro pump can completely discharge the medium such as blood remaining in the guide vane by arranging a cover with centrifugal blades at the rear of the guide vane, thereby avoiding the problem of the drive shaft, bearing and other components being stuck, failed, stopped running, etc. due to the accumulation of medium such as blood in the guide vane.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A clogging-proof micro pump comprises a pump casing, an impeller axially arranged in the pump casing, a guide vane connected to the rear of the pump casing, and a driving member arranged at the rear of the guide vane and suitable for driving the impeller to rotate; the impeller is suitable for rotating under the drive of the driving member to pump a medium entering the pump casing; the guide vane is suitable for guiding the medium pumped by the impeller out of the pump casing; the micro pump also comprises a cover casing arranged at the rear of the guide vane; a plurality of centrifugal blades are arranged on the front end surface of the cover casing; a guide vane outlet corresponding to at least the plurality of centrifugal blades is arranged on the rear peripheral side of the guide vane; the plurality of centrifugal blades are suitable for rotating to guide the medium remaining in the guide vane out of the guide vane outlet.

[0008] Optionally, the plurality of centrifugal blades are arranged in a radial shape on the front end surface of the cover shell.

[0009] Optionally, each of the plurality of centrifugal blades is bent and extended along a radial direction, and a width thereof gradually decreases along the corresponding radial direction.

[0010] Optionally, each of the plurality of centrifugal blades adopts a backward curved blade shape.

[0011] Optionally, a first channel is provided in the guide vane; the medium remaining in the guide vane is suitable for reaching the plurality of centrifugal blades through the first channel and being discharged by the plurality of centrifugal blades.

[0012] Optionally, the guide vane is provided with a guide vane channel extending axially therethrough; and the first channel includes the guide vane channel.

[0013] Optionally, the micro pump also includes a drive shaft that is at least partially inserted into the pump casing and the guide vane and is suitable for connecting the impeller and the drive member, as well as a spherical sliding bearing seat installed in the guide vane and a spherical sliding bearing installed in the spherical sliding bearing seat; the spherical sliding bearing is sleeved on the outer periphery of the drive shaft and is suitable for supporting the drive shaft to rotate; the spherical sliding bearing seat is provided with a bearing seat channel that passes through the axial direction; the first channel includes the bearing seat channel.

[0014] Optionally, the guide vane channel and the bearing seat channel are connected front to back to form the first channel.

[0015] Optionally, a second channel is provided between the front end face of the cover shell and the middle rear end face of the guide vane; the second channel is suitable for accommodating the plurality of centrifugal blades and is respectively connected to the first channel and the guide vane outlet; the medium remaining in the guide vane is suitable for entering the second channel through the first channel and then being discharged by the plurality of centrifugal blades.

[0016] Optionally, a pump casing outlet is provided on the rear peripheral side of the pump casing; a guide vane blade is provided at the front of the guide vane; and the guide vane blade is arranged corresponding to the pump casing outlet to guide the medium pumped by the impeller out of the pump casing outlet.

[0017] Compared with the prior art, the technical solution of the embodiment of the present invention has beneficial effects.

[0018] For example, by providing a cover with centrifugal blades at the rear of the guide vane, the micro pump can completely discharge the medium such as blood remaining in the guide vane, thereby avoiding the problem of the drive shaft, bearings and other components getting stuck, failing, stopping operation, etc. due to the accumulation of medium such as blood in the guide vane.

[0019] For another example, the micro pump timely discharges the medium such as blood accumulated inside and forms a hydraulic circulation by setting a guide vane outlet corresponding to the centrifugal blade, thereby avoiding the backflow of the medium such as blood at the outlet.

[0020] For another example, the micro pump is provided with corresponding spherical bearing seat grooves corresponding to the guide vane blades, which can not only smoothly drain the medium such as blood remaining at the guide vane blades to the centrifugal blades so that the centrifugal blades can drain the remaining medium such as blood, but also help to promote the flow of the medium such as blood and discharge it in time, thereby avoiding the formation of blood clots.

[0021] For another example, the micro pump uses a magnetic coupling assembly as the driving assembly of the impeller, and the driven magnetic wheel and the active magnetic wheel in the magnetic coupling assembly, as well as the motor assembly that drives the magnetic coupling assembly are all set to axially spaced seals, so that these components are independently and fully enclosed and completely isolated from the medium, thereby effectively preventing these components from being contaminated by the medium and causing problems such as jamming, failure, and stopping operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is an exploded schematic diagram of a micro pump in an embodiment of the present invention;

[0023] Figure 2 is an axial cross-sectional view of a micro pump according to an embodiment of the present invention;

[0024] Figure 3 1 is an exploded schematic diagram of a guide vane, a spherical sliding bearing, a spherical sliding bearing seat, a drive member bushing and a cover shell in an embodiment of the present invention;

[0025] Figure 4 is a schematic structural diagram of a guide vane in an embodiment of the present invention;

[0026] Figure 5 is a radial cross-sectional view of a guide vane in an embodiment of the present invention, wherein the shaded portion in the figure is a guide vane flushing channel, namely, a first channel;

[0027] Figure 6 In the embodiment of the present invention Figure 5 The cross-sectional view along line AA, the shaded part in the figure is the guide vane flushing channel, i.e., the first channel;

[0028] Figure 7 is a schematic structural diagram of a cover shell in an embodiment of the present invention;

[0029] Figure 8 is a top view of a cover shell in an embodiment of the present invention;

[0030] Fig. 9 1 is a schematic diagram of the assembly of the guide vane and the cover shell in an embodiment of the present invention;

[0031] Fig.10In the embodiment of the present invention Fig. 9 The cross-sectional view along line AA, the shaded part in the figure is the guide vane flushing channel, i.e., the first channel;

[0032] Fig.11 In the embodiment of the present invention Fig. 9 The cross-sectional view along line BB, the shaded part in the figure is the guide vane flushing channel, i.e., the first channel;

[0033] Fig.12 is a partial axial cross-sectional view of a micro pump according to an embodiment of the present invention;

[0034] Fig.13 In the embodiment of the present invention Fig.12 A partial enlarged schematic diagram of

[0035] Fig.14 1 is a front view of a spherical sliding bearing seat in an embodiment of the present invention.

[0036] Description of reference numerals:

[0037] 1 pump casing, 101 pump casing inlet, 102 pump casing outlet, 2 sliding bearing, 3 first drive shaft, 4 drive bushing, 5 cover casing, 501 centrifugal blade, F rotation direction of cover casing, 601 driven magnetic wheel, 602 active magnetic wheel, 7 motor assembly, 8 impeller, 9 guide vane, 901 guide vane blade, 902 guide vane outlet, 903 first channel, 904 second channel, 905 guide vane channel, 10 spherical sliding bearing, 11 spherical sliding bearing seat, 111 bearing seat channel, 12 adapter cover, 13 active magnetic wheel bushing, 14 locating pin, 701 ball bearing, 702 front cover, 703 casing, 704 iron core, 705 coil, 706 rear cover, 707 power supply line, 708 magnetic steel, 709 second drive shaft, 710 drive plate. DETAILED DESCRIPTION

[0038] In order to make the purpose, features and beneficial effects of the present invention more obvious and understandable, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. It is understood that the specific embodiments described below are only used to explain the present invention, rather than to limit the present invention. In addition, the same or similar reference numerals may be used in the figures to refer to the same or similar elements in different embodiments, and the description of the same or similar elements in different embodiments and the description of the prior art elements, features, effects, etc. may be omitted.

[0039] Reference Figures 1 to 14 , an embodiment of the present invention provides an anti-clogging micro pump.

[0040] Specifically, the micro pump comprises a pump housing 1, an impeller 8 axially arranged in the pump housing 1, a guide vane 9 connected to the rear of the pump housing 1, and a driving member arranged at the rear of the guide vane 9 and suitable for driving the impeller 8 to rotate. The impeller 8 is suitable for rotating under the drive of the driving member to pump the medium entering the pump housing 1; the guide vane 9 is suitable for guiding the medium pumped by the impeller 8 out of the pump housing 1.

[0041] In a specific implementation, the pump housing 1 is suitable for providing a reliable passage for the impeller 8 to pump the medium.

[0042] In some embodiments, the pump housing 1 has a hollow cylindrical shape. The impeller 8 is disposed in the pump housing 1 along the axial direction.

[0043] In a specific implementation, the pump housing 1 includes a pump housing inlet 101 at its front end and a pump housing outlet 102 arranged at its rear circumference. The pump housing inlet 101 is suitable for allowing external media to enter the pump housing 1; the pump housing outlet 102 is suitable for allowing the media in the pump housing 1 to leave the pump housing 1.

[0044] In some embodiments, the micropump can be used as a blood pump. In this case, the medium can include blood. The micropump can be used to pump blood in the heart to the artery.

[0045] In a specific implementation, the guide vane 9 is connected to the rear of the pump housing 1 and includes a guide vane blade 901 at the front thereof for rectifying the pumped medium. The guide vane blade 901 is arranged corresponding to the pump housing outlet 102 to guide the medium pumped by the impeller 8 out of the pump housing outlet 102.

[0046] In some embodiments, a plurality of guide vane blades 901 are provided along the circumference of the guide vane 9 .

[0047] In the embodiment of the present invention, the axial direction of the micro pump and its components is the same as the direction of the rotation axis of the impeller 8. Accordingly, the circumferential direction and the radial direction are both determined based on the axial direction.

[0048] For ease of description, in some embodiments, the axial direction can be made parallel to the front-rear direction. In this case, the impeller 8 is suitable for rotating around the front-rear direction and pumping the medium from the pump casing inlet 101 backward. The guide vane 9 is located behind the impeller 8 and is suitable for guiding the medium pumped by the impeller 8 to the pump casing outlet 102 at the rear peripheral side of the pump casing 1, so as to guide the medium out of the pump casing 1 through the pump casing outlet 102.

[0049] In the embodiment of the present invention, a plurality includes two or more.

[0050] In some embodiments, a plurality of pump casing outlets 102 are arranged around the rear circumference of the pump casing 1, and the plurality of pump casing outlets 102 correspond one-to-one to the plurality of guide vane blades 901, so that the medium pumped by the impeller 8 can be guided to the plurality of pump casing outlets 102 respectively through the plurality of guide vane blades 901.

[0051] In a further embodiment, the guide vane 9 may include three guide vane blades 901. Accordingly, three pump casing outlets 102 are also provided. The three pump casing outlets 102 correspond to the three guide vane blades 901 one by one, so that the medium pumped by the impeller 8 is guided to the three pump casing outlets 102 respectively through the three guide vane blades 901.

[0052] In a specific implementation, the micro pump further includes a cover 5 disposed at the rear of the guide vane 9 .

[0053] In some embodiments, the rear portion of the housing 5 is adapted to define a driver chamber to accommodate the driver and isolate the driver from the medium, thereby preventing the driver from being contaminated by the medium.

[0054] In some embodiments, the driving member is tightly embedded in the driving member chamber, and the rear portion of the cover 5 is tightly sleeved outside the driving member so that the cover 5 is suitable for rotating with the driving member.

[0055] In a further embodiment, the driving member may be fixed to the housing 5 by bonding.

[0056] In some embodiments, a plurality of centrifugal blades 501 are disposed on the front end surface of the housing 5. Accordingly, a guide vane outlet 902 corresponding to the arrangement of the plurality of centrifugal blades is provided on the rear peripheral side of the guide vane 9.

[0057] In a specific implementation, the plurality of centrifugal blades 501 are adapted to rotate along with the casing 5 to guide the medium remaining in the guide vane 9 out of the guide vane outlet 902 .

[0058] In a specific implementation, the micro pump further includes a first drive shaft 3 at least partially inserted into the pump housing 1 and the guide vane 9 and adapted to connect the impeller 8 and the drive member. Specifically, the first drive shaft 3 passes through the guide vane 9, and its two ends are respectively connected to the impeller 8 and the drive member.

[0059] In some embodiments, the impeller 8 is connected to the first drive shaft 3 by interference fitting.

[0060] In some embodiments, the driving member can be connected to the first driving shaft 3 by bonding.

[0061] In some embodiments, the micro pump further comprises a sliding bearing 2 disposed in the guide vane 9. The sliding bearing 2 is sleeved outside the first drive shaft 3 and is suitable for reducing the friction of the first drive shaft 3 during the rotation process.

[0062] In some embodiments, the micro pump further comprises a spherical sliding bearing seat 11 installed in the middle of the guide vane 9 and a spherical sliding bearing 10 installed in the spherical sliding bearing seat 11. The spherical sliding bearing 10 is sleeved on the outer periphery of the first drive shaft 3 and is suitable for supporting the first drive shaft 3 to rotate.

[0063] In some embodiments, an interference fit is adopted between the spherical sliding bearing 10 and the first driving shaft 3 .

[0064] In some embodiments, the micro pump further comprises a positioning pin 14. The positioning pin 14 is adapted to be axially penetrated in the guide vane 9 and the spherical sliding bearing seat 11 so as to position and connect the guide vane 9 and the spherical sliding bearing seat 11 in the axial direction.

[0065] In some embodiments, the micro pump further includes a drive bushing 4 at least partially disposed in the spherical sliding bearing seat 11 and located at the rear end of the spherical sliding bearing 10. The drive bushing 4 is sleeved on the outer periphery of the first drive shaft 3 and is fixed by the spherical sliding bearing 10 and the cover 5.

[0066] In some embodiments, the front end of the first driving shaft 3 is connected to the rear end of the impeller 8, and the rear end thereof passes through the housing 5 and is connected to the driving member. When the driving member rotates, the impeller 8 is driven to rotate through the first driving shaft 3.

[0067] In a further embodiment, when the driving member rotates, the housing 5 rotates with the driving member and drives the plurality of centrifugal blades 501 to rotate synchronously. In this case, the rotation direction and rotation speed of the plurality of centrifugal blades 501 are the same as those of the impeller 8.

[0068] In some embodiments, a plurality of centrifugal blades 501 are arranged in a radial shape on the front end surface of the housing 5 .

[0069] In a further embodiment, a plurality of centrifugal blades are evenly spaced and arranged in a radial shape on the front end surface of the housing 5 .

[0070] In some embodiments, each of the plurality of centrifugal blades 501 is bent and extended along a radial direction at the front end surface of the housing 5 .

[0071] In a specific implementation, the rotation direction of the casing 5 is consistent with the rotation direction of the impeller 8, and the rotation direction depends on the bending direction of the impeller blades, and the bending direction of the centrifugal blades 501 is determined based on the rotation direction.

[0072] In a further embodiment, the width of each centrifugal blade 501 in the plurality of centrifugal blades 501 gradually decreases along the corresponding radial direction.

[0073] In some embodiments, each centrifugal blade 501 in the plurality of centrifugal blades 501 has a backward curved blade shape.

[0074] The above technical solution can not only reduce the power consumption of the centrifugal blades 501, but also reduce the speed increment of the driving medium such as blood, which can avoid the rupture of the medium such as blood due to excessive acceleration, and is conducive to controlling a good hemolysis value. In addition, the required transmission torque is small and the transmission efficiency is high, which will not affect the size of the driving part.

[0075] In some embodiments, a first channel 903 is provided in the guide vane 9 ; the medium remaining in the guide vane 9 is suitable for reaching the plurality of centrifugal blades 501 through the first channel 903 and being discharged by the plurality of centrifugal blades 501 .

[0076] In some embodiments, the guide vane 9 is provided with a guide vane channel 905 penetrating in the axial direction. In this case, the first channel 903 includes the guide vane channel 905.

[0077] As mentioned above, the micro pump further comprises a spherical sliding bearing seat 11 installed in the guide vane 9 and a spherical sliding bearing 10 installed in the spherical sliding bearing seat 11 .

[0078] In some embodiments, the spherical sliding bearing seat 11 is provided with a bearing seat passage 111 penetrating in the axial direction. In this case, the first passage 903 also includes the bearing seat passage 111.

[0079] In a further embodiment, the guide vane channel 905 and the bearing seat channel 111 are connected front to back to form a first channel 903. The medium remaining in the guide vane 9 is suitable for reaching the plurality of centrifugal blades 501 through the first channel 903 and being discharged by the plurality of centrifugal blades 501.

[0080] In some embodiments, a plurality of guide vane channels 905 and a plurality of bearing seat channels 111 are respectively provided, and the plurality of guide vane channels 905 and the plurality of bearing seat channels 111 correspond one to one to form a plurality of first channels 903, so that the medium such as blood remaining in the guide vane 9 is respectively drained to the plurality of centrifugal blades 501 through the plurality of first channels 903, and the remaining medium such as blood is further drained out through the plurality of centrifugal blades 501.

[0081] In a further embodiment, three guide vane channels 905 and three bearing seat channels 111 may be respectively provided, and the three guide vane channels 905 and the three bearing seat channels 111 correspond one to one to form three first channels 903, so that the medium such as blood remaining in the guide vane 9 is respectively drained to the multiple centrifugal blades 501 through the three first channels 903, and then the residual medium such as blood is discharged through the multiple centrifugal blades 501.

[0082] As mentioned above, in some embodiments, the micro pump further includes a positioning pin 14 .

[0083] In a further embodiment, a plurality of positioning pins 14 may be provided, and each positioning pin 14 of the plurality of positioning pins 14 is axially penetrated in a group of corresponding guide vane channels 905 and bearing seat channels 111, so that the corresponding guide vane channels 905 and bearing seat channels 111 are connected front to back and form a corresponding first channel 903, thereby ensuring the patency of the first channel 903, and further facilitating the residual medium in the guide vane 9, such as blood, to pass through the first channel 903.

[0084] In a specific implementation, the number of the positioning pins 14 is the same as the number of the first channels 903 , so that one first channel 903 is connected by one positioning pin 14 .

[0085] In some embodiments, a second channel 904 is further provided between the front end surface of the cover shell 5 and the rear end surface of the middle portion of the guide vane 9 .

[0086] As mentioned above, the micro pump further comprises a spherical sliding bearing seat 11 installed in the middle of the guide vane 9 .

[0087] In some embodiments, the rear end face of the spherical sliding bearing seat 11 is flush with the middle rear end face of the guide vane 9. In this case, the second channel 904 includes a gap between the front end face of the cover 5 and the middle rear end face of the guide vane 9 and the rear end face of the spherical sliding bearing seat 11.

[0088] In a specific implementation, a non-zero angle is formed between the second channel 904 and the first channel 903 .

[0089] In a specific implementation, the second channel 904 is suitable for accommodating a plurality of centrifugal blades 501, and is respectively connected to the first channel 903 and the guide vane outlet 902. The medium remaining in the guide vane 9 is suitable for entering the second channel 904 through the first channel 903, and then being guided to the guide vane outlet 902 by the plurality of centrifugal blades 501, and leaving the micro pump from the guide vane outlet 902.

[0090] By adopting the above technical solution, the medium such as blood remaining in the micropump, especially in the guide vane 9, can be completely discharged from the micropump, thereby avoiding the problem of the first drive shaft 3, the spherical sliding bearing 10 and other components being stuck, failed, stopped, etc. due to the accumulation of medium such as blood in the micropump.

[0091] In some embodiments, the micro pump further comprises a magnetic coupling assembly connected to the impeller 8, and a motor assembly 7 connected to the magnetic coupling assembly. The motor assembly 7 is suitable for driving the magnetic coupling assembly to rotate, and the magnetic coupling assembly is suitable for driving the impeller 8 to rotate.

[0092] In some embodiments, the magnetic coupling assembly may include a driven magnetic wheel 601 and a driving magnetic wheel 602 that are spaced and arranged opposite to each other along the axial direction. The driven magnetic wheel 601 is suitable for being a driving member of the impeller 8 and is connected to the impeller 8 through the first driving shaft 3; the driving magnetic wheel 602 is connected to the motor assembly 7 and is suitable for rotating under the drive of the motor assembly 7, thereby driving the driven magnetic wheel 601 to rotate through the magnetic coupling effect, thereby driving the impeller 8 to rotate.

[0093] In some embodiments, both the active magnetic wheel 602 and the driven magnetic wheel 601 are permanent magnetic wheels, and both have a Halbach array magnet structure, and strong magnetic surfaces and weak magnetic surfaces that are relatively arranged. In a specific implementation, the strong magnetic surfaces of the active magnetic wheel 602 and the driven magnetic wheel 601 are relatively arranged, and the magnetic poles of the relative parts of the two are opposite. In this way, the magnetic coupling effect between the active magnetic wheel 602 and the driven magnetic wheel 601 can be improved, thereby improving the transmission torque and transmission efficiency.

[0094] In some embodiments, the micro pump further includes a transfer cover 12 installed behind the guide vane 9 .

[0095] In a specific implementation, the adapter cover 12 is located at the rear of the housing 5 and is suitable for defining an active magnetic wheel chamber to accommodate the active magnetic wheel 602 and isolate the active magnetic wheel 602 from the medium.

[0096] In some embodiments, the micro pump further includes a housing 703 disposed behind the adapter cover 12 to install and house the motor assembly 7 .

[0097] In a further embodiment, the micro pump further comprises a front cover 702 and a rear cover 706 mounted on the front and rear ends of the housing 703. The front cover 702 is connected to the rear of the adapter cover 12, and is suitable for defining an active magnetic wheel chamber together with the adapter cover 12 to accommodate the active magnetic wheel 602 and seal it to isolate it from the medium. The rear cover 706 is connected to the rear of the housing 703, and is suitable for defining a motor assembly chamber suitable for installing and accommodating the motor assembly 7 together with the housing 703.

[0098] In some embodiments, the micro pump further comprises a second drive shaft 709 adapted to be driven and rotated by the motor assembly 7. The second drive shaft 709 is supported by the housing 703 and passes through the front cover 702 to be coaxially connected to the active magnetic wheel 602, thereby transmitting torque from the motor assembly 7 to the active magnetic wheel 602.

[0099] In some embodiments, the active magnetic wheel 602 can be fixed on the second driving shaft 709 by bonding.

[0100] In some embodiments, the front cover 702 and the rear cover 706 are each equipped with a ball bearing 701 for supporting the second drive shaft 709 to rotate.

[0101] In some embodiments, the micro pump further includes an active magnetic wheel bushing 13 disposed in the active magnetic wheel chamber. The active magnetic wheel bushing 13 is sleeved outside the second drive shaft 709, one end of which abuts against the step where the second drive shaft 709 passes through the bearing or against the inner ring of the bearing, and the other end abuts against the active magnetic wheel 602, thereby forming a limit.

[0102] In some embodiments, the motor assembly 7 may include a magnetic steel 708 disposed around the second drive shaft 709, a coil 705 wound around the magnetic steel 708, and an iron core 704 disposed around the coil 705. The coil 705 is adapted to generate a magnetic field to magnetize the iron core 704 when powered, and then drive the magnetic steel 708 through the magnetized iron core 704 to drive the second drive shaft 709 to rotate.

[0103] In some embodiments, the micro pump further includes a driving board 710 disposed in the housing 703 , and a power supply line 707 passing through the rear cover 706 and connected to the driving board 710 .

[0104] In a specific implementation, the driving board 710 is powered by the power supply line 707. The driving board 710 has a built-in program for powering the coil 705, so that the coil 705 generates a magnetic field when powered, thereby magnetizing the iron core 704, and driving the magnet 708 through the magnetized iron core 704 to drive the second driving shaft 709 to rotate.

[0105] In a specific implementation, the rotation of the second driving shaft 709 can drive the active magnetic wheel 602 to rotate, and then drive the driven magnetic wheel 601 to rotate through magnetic coupling, so that the impeller 2 is driven to rotate through the rotating driven magnetic wheel 601 to pump the medium.

[0106] In a specific implementation, the impeller 8 is an axial flow impeller. Accordingly, the micro pump is an axial flow pump, and its overall pumping medium, such as blood pumping function, is provided by the axial flow impeller. The centrifugal blades 501 are mainly used to increase the flow speed of the medium, such as blood, in the guide vane flushing channel, i.e., the first channel 903 and the second channel 904, so as to improve the flushing effect.

[0107] In a specific implementation, the flow direction of the medium such as blood pumped out by the centrifugal blades 501 is consistent with the flow direction of the medium such as blood pumped out by the axial flow impeller, which will not cause a decrease in the pumping efficiency such as blood pumping.

[0108] Furthermore, when the medium pumped by the micropump is blood, the blood pumped by the centrifugal blades 50 will immediately participate in the cardiovascular circulation, and no blood will repeatedly participate in the centrifugal circulation, that is, no repeated cutting will be formed, and no adverse effects will be caused on blood cells.

[0109] Although specific embodiments have been described above, these embodiments are not intended to limit the scope of the present disclosure, even when only a single embodiment is described with respect to specific features. The feature examples provided in the present disclosure are intended to be illustrative rather than limiting, unless otherwise stated. In specific implementations, the technical features of one or more dependent claims may be combined with the technical features of the independent claims, based on actual needs and where technically feasible, and the technical features from the corresponding independent claims may be combined in any appropriate manner rather than just by the specific combinations listed in the claims.

[0110] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims

1. An anti-clogging micro pump, comprising a pump housing, an impeller axially arranged in the pump housing, a guide vane connected to the rear of the pump housing, and a driving member arranged at the rear of the guide vane and suitable for driving the impeller to rotate; the impeller is suitable for rotating under the drive of the driving member to pump a medium entering the pump housing; the guide vane is suitable for guiding the medium pumped by the impeller out of the pump housing; characterized in that: The invention also comprises a cover shell arranged at the rear of the guide vane, wherein the rear of the cover shell is suitable for defining a driving member chamber to accommodate the driving member, and the rear of the cover shell is tightly sleeved outside the driving member so that the cover shell is suitable for rotating with the driving member; a plurality of centrifugal blades are arranged on the front end surface of the cover shell; a guide vane outlet corresponding to at least the plurality of centrifugal blades is arranged on the rear peripheral side of the guide vane; the plurality of centrifugal blades are suitable for rotating with the cover shell to guide the medium remaining in the guide vane out of the guide vane outlet; a first channel is arranged in the guide vane; The medium remaining in the guide vane is suitable for reaching the plurality of centrifugal blades through the first channel and being discharged by the plurality of centrifugal blades; A second channel is provided between the front end surface of the cover shell and the middle rear end surface of the guide vane; The second channel is suitable for accommodating the plurality of centrifugal blades, and is respectively connected with the first channel and the guide vane outlet; the medium remaining in the guide vane is suitable for entering the second channel through the first channel and then being discharged by the plurality of centrifugal blades; a pump casing outlet is arranged on the rear peripheral side of the pump casing; a guide vane blade is arranged at the front of the guide vane; the guide vane blade is arranged corresponding to the pump casing outlet to discharge the medium pumped by the impeller from the pump casing outlet.

2. The micro pump according to claim 1, characterized in that: The plurality of centrifugal blades are arranged in a radial shape on the front end surface of the housing.

3. The micro pump according to claim 1, characterized in that: Each of the plurality of centrifugal blades is bent and extended along a radial direction, and a width thereof is gradually reduced along the corresponding radial direction.

4. The micro pump according to claim 1, characterized in that: Each of the plurality of centrifugal blades adopts a backward curved blade shape.

5. The micro pump according to claim 1, characterized in that: The guide vane is provided with a guide vane channel penetrating along the axial direction; the first channel includes the guide vane channel.

6. The micro pump according to claim 5, characterized in that: It also includes a drive shaft that is at least partially inserted into the pump casing and the guide vane and is suitable for connecting the impeller and the drive member, as well as a spherical sliding bearing seat installed in the guide vane and a spherical sliding bearing installed in the spherical sliding bearing seat; the spherical sliding bearing is sleeved on the outer periphery of the drive shaft and is suitable for supporting the drive shaft to rotate; the spherical sliding bearing seat is provided with a bearing seat channel that penetrates along the axial direction; the first channel includes the bearing seat channel.

7. The micro pump according to claim 6, characterized in that: The guide vane channel and the bearing seat channel are connected front to back to form the first channel.

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