Drive mechanism and blood pump

Abstract

The drive mechanism (10) and blood pump (1) comprise a housing assembly (11) and a rotating assembly (12), the housing assembly (11) having a mounting groove (511) and a through-hole (522), the mounting groove (511) having a bottom wall (512) and a side wall (513). The rotating assembly (12) has a distal end rotatably mounted in the through-hole (522) and a proximal end having a rotating head (800), the rotating head (800) being rotatably mounted in the mounting groove (511) and slidably abutting the bottom wall (512) and the side wall (513), the rotating head (800) having a first spherical wall (810) in contact with the side wall (513). The configurations of the drive mechanism (10) and blood pump (1) described above have a long life.

Description

[Technical Field]

[0001] This application claims priority from a Chinese patent application bearing application number CN202211580662.1, filed with the State Intellectual Property Office of the People's Republic of China on December 9, 2022, the entire contents of which are incorporated herein by reference. This application relates to the technical field of medical devices, and in particular to drive mechanisms and blood pumps. [Background technology]

[0002] Blood pumps are designed to be inserted percutaneously into a patient's arteries or veins, for example in the thigh or armpit, and can be advanced to the patient's heart to function as a left ventricular assist device or a right ventricular assist device. Thus, blood pumps are also called intracardiac or intravascular blood pumps.

[0003] A blood pump generally has a drive mechanism and an impeller, and the impeller is connected to a rotating assembly of the drive mechanism. To ensure stable rotation of the rotating assembly, it is usually necessary to provide a mechanism for positioning or limiting the position of the rotating assembly. The position limiting end of the rotating assembly usually rotates relative to the housing, causing wear, making it difficult to maintain the wear resistance of the rotating assembly for long-term operation. Summary of the Invention [Problem to be solved by the invention]

[0004] An object of the present application is to provide a drive mechanism and a blood pump with a long life. [Means for solving the problem]

[0005] An embodiment of the present invention provides a drive mechanism, a housing assembly including a mounting groove having a bottom wall and a side wall, and a through hole; a rotating assembly having a distal end rotatably inserted into the through hole and a proximal end having a rotating head, the rotating head being rotatably mounted in the mounting groove and slidably abutting the bottom wall and the side wall, the rotating head having a first spherical wall in contact with the side wall.

[0006] In one embodiment, the cross section of the mounting groove along a direction perpendicular to the rotation axis of the rotating assembly is circular or rectangular.

[0007] In one aspect, a cross section of the side wall along the rotation axis direction of the rotating assembly is parallel to the rotation axis of the rotating assembly.

[0008] In one aspect, the first spherical wall is tangent to the bottom wall and / or the bottom wall is perpendicular to the side wall.

[0009] In one aspect, the mounting groove further has a mouth portion and an arcuate wall, the rotary head is drilled into the mouth portion, the side wall connects the arcuate wall and the bottom wall, and the arcuate wall is adjacent to the mouth portion.

[0010] In one embodiment, the distance from the tangent point where the first spherical wall meets the side wall to the connection line between the side wall and the bottom wall is 60%-75% of the distance from the mouth to the connection line between the side wall and the bottom wall. And / or, the distance from the contact point where the first spherical wall contacts the side wall to the connection line where the side wall connects to the arc surface is 0.01 mm to 0.015 mm.

[0011] In one embodiment, the rotating head includes a ball head portion and a rod portion connected to the ball head portion, the rod portion being inserted into an opening of the mounting groove, the ball head portion being rotatably received within the mounting groove, a recess formed at one end of the rod portion adjacent to the ball head portion, the recess being inserted into the opening of the mounting groove, and the cross-sectional width of the recess in a direction perpendicular to the rotation axis of the rotating assembly being smaller than the diameter of the ball head portion.

[0012] In one embodiment, the width of the cross section of the recess in a direction perpendicular to the rotation axis of the rotation assembly is 75%-85% of the diameter of the sphere on which the ball head portion is located.

[0013] In one embodiment, the rotary head includes a ball head portion drilled into the mouth of the mounting groove, and the diameter of the mouth of the mounting groove is equal to or smaller than the diameter of the sphere in which the ball head portion is located, but is equal to or larger than half the diameter of the sphere in which the ball head portion is located.

[0014] In one embodiment, the rotary head further includes a second spherical wall connected to the first spherical wall, the second spherical wall slidably abutting the bottom wall of the mounting groove and contacting the bottom wall.

[0015] In one embodiment, the rotary head further includes a convex ring having a rotation axis coinciding with that of the rotary assembly, and the second spherical wall is mounted on the convex ring.

[0016] In one embodiment, the inner diameter of the convex ring is equal to or greater than half the diameter of the sphere on which the first spherical wall is located.

[0017] In one embodiment, the housing assembly includes a pump case and a support member attached to the pump case, the mounting groove being opened in the support member, the drive mechanism further including a mounting seat fixed to the pump case, the mounting seat having a mounting cavity and a fluid supply hole communicating with the mounting cavity, the support member being attached to the mounting cavity, and at least one of the mounting seat and the support member having a flow path communicating with the fluid supply hole.

[0018] In one embodiment, the flow path is opened in the support member, and the flow path on the support member has a first opening communicating with the mounting groove and a second opening communicating with the liquid delivery hole, and the rotating head is positioned to avoid the position of the first opening.

[0019] In one aspect, the support member includes a collar and a bottom plate connected to one end of the collar, the mounting groove is formed by an enclosure formed by the bottom plate and the collar, at least a portion of the inner wall of the collar forms the side wall, and the bottom wall is provided on the bottom plate.

[0020] In one embodiment, the flow path communicating with the mounting groove is provided on the bottom plate, the flow path on the bottom plate is formed to extend from the side surface of the bottom plate to the center of the bottom plate, and the rotating head is positioned to avoid the position of the flow path on the bottom plate.

[0021] In one aspect, the rotating assembly includes a rotating shaft and a rotor, the rotating shaft having a proximal end and a distal end rotatably bored through the through hole, the rotor including a first rotor unit fixed to the rotating shaft, and at least one of the first rotor unit and the rotating shaft being connected to the rotating head.

[0022] In one embodiment, a stop surface is provided on the rotary head, the stop surface is located on the side of the rotary head away from the bottom wall of the mounting groove, and the stop surface and the mouth of the mounting groove are spaced a fixed distance apart, and the first rotor unit abuts against the stop surface, thereby spaced a fixed distance apart from the mouth of the mounting groove.

[0023] In one aspect, the housing assembly includes a pump case and a sleeve attached to the pump case, the through hole being provided in the sleeve, and the drive mechanism further includes a stopper fixed to the rotating assembly, the stopper being positioned between the sleeve and the rotating head and abutting the sleeve, thereby limiting movement of the rotating assembly in a direction away from the mounting groove.

[0024] The present embodiment further provides a blood pump including an impeller and any of the drive mechanisms described above, wherein the impeller is connected to the rotating assembly and can rotate following the rotating assembly. [Effects of the Invention]

[0025] The rotating head of the drive mechanism of this embodiment abuts against the side and bottom walls of the mounting groove, thereby limiting the position of the proximal end of the rotating assembly. The first spherical wall of the rotating head abuts against the side walls, and when the rotating head rotates, the contact between the rotating head and the side walls of the mounting groove can be considered line contact. Compared to a mating method in which the entire first spherical wall of the rotating head contacts the groove wall of the ball head groove, the contact area between the rotating head and the groove wall is smaller, i.e., the wear area between the rotating head and the side walls is smaller, improving the wear resistance of the rotating head and extending its lifespan. Furthermore, because the contact area is smaller, frictional resistance is also smaller immediately after the rotating head is started, reducing the starting torque and enabling faster startup. [Brief explanation of the drawings]

[0026] In order to more clearly explain the technical aspects of the embodiments of the present application, the accompanying drawings necessary for explaining the embodiments or prior art will be briefly introduced below. The accompanying drawings introduced below are merely some embodiments of the present application, and it is obvious to those skilled in the art that other accompanying drawings can be obtained based on these accompanying drawings without any creative efforts. [Figure 1] 1 is a schematic diagram illustrating the configuration of a blood pump provided in an embodiment of the present invention. [Figure 2] 2 is a cross-sectional view of the blood pump shown in FIG. 1 with some of the conduits omitted. [Figure 3] FIG. 3 is a partial enlarged view of part I shown in FIG. 2. [Figure 4] This is the second enlarged view of part I shown in Figure 2. [Figure 5] This is the third enlarged view of part I shown in Figure 2. [Figure 6] FIG. 3 is a partially enlarged view of the configuration of the distal end of the blood pump shown in FIG. 2. [Figure 7] FIG. 3 is a structural schematic diagram of a support member of the blood pump shown in FIG. 2. [Figure 8] FIG. 3 is a schematic diagram illustrating the configuration of a mounting seat portion of the blood pump shown in FIG. 2. [Figure 9] FIG. 3 is a partially enlarged view of the configuration of the proximal end of the blood pump shown in FIG. 2. [Figure 10] FIG. 3 is a schematic diagram illustrating the configuration of the sleeve in FIG. 2. [Figure 11] FIG. 10 is a partially enlarged view of the configuration of the distal end of a second embodiment of the blood pump according to the present application. [Figure 12] FIG. 12 is a locally enlarged view of part II in FIG. [Figure 13] FIG. 10 is a partially enlarged view of the configuration of the distal end of the third embodiment of the blood pump according to the present application. [Figure 14] FIG. 14 is a schematic diagram of the rotary head shown in FIG. 13. [Figure 15] FIG. 14 is a schematic diagram illustrating the configuration of a support member in FIG. [Figure 16] 14 is a schematic diagram of the support member of FIG. 13, which is composed of a collar and a bottom plate. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0027] Hereinafter, the embodiments of the present application will be described in detail, and examples of the embodiments are shown in the accompanying drawings, and the same or similar reference numerals indicate the same or similar components or components having the same or similar functions. The embodiments described below with reference to the accompanying drawings are illustrative and are used merely to explain the present application, and should not be understood as limiting the present application.

[0028] Throughout the specification, references to "one embodiment" or "an embodiment" mean a particular feature described in connection with an embodiment, and mean that a structure or characteristic is included in at least one embodiment of the present application. Thus, the appearances of the phrase "in one embodiment" or "in some embodiments" in various places throughout the specification do not all refer to the same embodiment. Furthermore, particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0029] In the description of this application, directions or positional relationships indicated by terms such as "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," and "outside" are based on the directions or positional relationships shown in the accompanying drawings, and are intended merely for the convenience and simplification of the description of this application, and do not explicitly or imply that a specified device or component must have a specific orientation and be constructed and operated in a specific direction, and therefore should not be understood as limiting this application.

[0030] Furthermore, the terms "first" and "second" are merely for descriptive purposes and should not be understood as expressing or suggesting relative importance or implicitly indicating the number of technical features shown, so that a feature qualified by "first" or "second" may expressly or imply that one or more of the feature is included.

[0031] In this application, unless otherwise clearly specified or limited, the terms "attach," "connect," "couple," "fixed," etc. should be understood in a broad sense, and may refer to, for example, a fixed connection, a detachable connection, or integration, a mechanical connection, an electrical connection, a direct connection, an indirect connection via an intermediate medium, internal communication between two components, or an interactive relationship between two components. Those skilled in the art can understand the specific meaning of the above terms in this application on a case-by-case basis.

[0032] In the field of interventional medicine, the side of the instrument closest to the operator is defined as the proximal end, and the side away from the operator is defined as the distal end.

[0033] The drive mechanism 10 and the blood pump 1 according to the embodiment of the present invention will be described below.

[0034] 1, the blood pump 1 includes a drive mechanism 10 and an impeller 20. The drive mechanism 10 is operatively connected to the impeller 20 and can drive the impeller 20 to rotate.

[0035] Specifically, the blood pump 1 further includes a cannula 30 connected to the drive mechanism 10. The impeller 20 is rotatably housed within the cannula 30. The cannula 30 has a blood inlet 31 and a blood outlet 32. When the impeller 20 rotates, blood flows into the cannula 30 through the blood inlet 31 and flows out through the blood outlet 32. When the blood pump 1 is used in the left ventricle, the cannula 30 extends to penetrate a heart valve such as the aortic valve, with the blood inlet 31 located within the ventricle of the heart and the blood outlet 32 ​​and the drive mechanism 10 located within a blood vessel outside the heart, such as the aorta.

[0036] Specifically, the blood pump 1 further includes a conduit 40 connected to the drive mechanism 10. Here, the conduit 40 is used to house various supply lines. More specifically, the supply lines include wires electrically connected to the drive mechanism 10, signal lines electrically connected to sensors on the blood pump 1, and a flushing line for supplying a flushing fluid to the blood pump 1. For example, the flushing fluid may be saline, heparin-containing saline, glucose, or the like.

[0037] 2 to 6, the drive mechanism 10 includes a housing assembly 11 and a rotating assembly 12. The housing assembly 11 includes a mounting groove 511 having a bottom wall 512 and a side wall 513, and a through-hole 522. The rotating assembly 12 includes a distal end rotatably mounted in the through-hole 522, and a proximal end having a rotating head 800. The rotating head 800 is rotatably mounted in the mounting groove 511 and slidably abuts the bottom wall 512 and the side wall 513, and the rotating head 800 has a first spherical wall 810 that abuts the side wall 513. The cannula 30 and the conduit 40 are each fixed to the housing assembly 11. The rotating assembly 12 is located partially within the cannula 30 and partially within the housing assembly 11. The impeller 20 is fixed to the distal end of the rotating assembly 12.

[0038] The rotating head 800 of the drive mechanism described above abuts against the side wall 513 and bottom wall 512 of the mounting groove 511, thereby limiting the position of the proximal end of the rotating assembly 12. The first spherical wall 810 of the rotating head 800 abuts against the side wall 513. When the rotating head 800 rotates, the contact between the rotating head 800 and the side wall 513 of the mounting groove 511 can be considered line contact. Compared to a mating method in which the entire first spherical wall 810 of the rotating head 800 contacts the groove wall of the ball head groove, the contact area between the rotating head 800 and the groove wall of the mounting groove 511 is smaller, which reduces the wear area between the rotating head 800 and the side wall 513, improving the wear resistance of the rotating head 800 and extending its lifespan. Furthermore, because the contact area is smaller, frictional resistance is also smaller immediately after the rotating head 800 starts, reducing the torque required during startup and enabling faster startup.

[0039] In the illustrated embodiment, when the rotating assembly 12 rotates stably, the side wall 513 is parallel to the rotation axis of the rotating assembly 12. During rotation, the rotating assembly 12 may experience slight axial movement or slight radial yaw. By installing the rotating head 800 as described above, when the rotating assembly 12 moves axially within the mounting groove 511, the rotating head 800 remains in contact with the side wall 513 regardless of where the rotating assembly 12 moves, providing stable radial positioning. When the rotating assembly 12 yaws radially, the rotating head 800 can roll within the mounting groove 511, while the first spherical wall 810 remains in constant contact with the side wall 513.

[0040] Here, the stable rotation of the rotating assembly 12 means that the rotation axis of the rotating assembly 12 and the central axis of the housing assembly 11 are basically aligned when the rotating assembly 12 rotates.

[0041] Of course, in other embodiments, the side wall 513 and the rotation axis of the rotating assembly 12 may be inclined at a certain angle to each other. Specifically, the angle between the side wall 513 and the rotation axis of the rotating assembly 12 is an acute angle, i.e., the distance between the side wall 513 and the rotation axis of the rotating assembly 12 gradually increases as it moves away from the bottom wall 512. This arrangement allows the rotating head 800 to more smoothly enter the mounting groove 511 during assembly.

[0042] The mounting groove 511 has a certain depth and a circular cross section perpendicular to the rotation axis of the rotating assembly 12. In the illustrated embodiment, the side wall 513 is a cylindrical surface, and when the rotating head 800 abuts against the side wall 513, the first spherical wall 810 contacts the side wall 513. That is, when the rotating head 800 rotates, the first spherical wall 810 and the side wall 513 can be considered to be in line contact, and the contact area can be reduced. Furthermore, when the rotating assembly 12 yaws radially, the cylindrical side wall 513 can contact the rotating head 800 in line contact no matter to what position the rotating head 800 rolls, maintaining the effect of limiting the position of the rotating head 800 in the radial direction.

[0043] In some embodiments, the cross section of the mounting groove 511 may be rectangular, i.e., the side wall 513 is surrounded by four flat surfaces. When the rotating head 800 abuts against the side wall 513, the first spherical wall 810 abuts against each of the four flat surfaces. When the rotating head 800 rotates, the first spherical wall 810 and the side wall 513 can be considered to be in point contact. This arrangement can reduce the contact area and wear on the rotating head 800. In other embodiments, the cross section of the mounting groove 511 can be triangular, pentagonal, hexagonal, etc., and the point contact can reduce the contact area and wear.

[0044] 2, 3, 9 and 10, the housing assembly 11 includes a pump case 100, a support member 510 and a sleeve 520.

[0045] Specifically, the pump case 100 has a generally cylindrical configuration with both ends open. The distal end of the pump case 100 is fixed to the cannula 30, and the proximal end is fixed to the conduit 40.

[0046] The support member 510 and the sleeve 520 are each mounted within the pump case 100. The support member 510 is installed at the proximal end of the pump case 100, and the sleeve 520 is installed at the distal end of the pump case 100. Both the support member 510 and the sleeve 520 are fixed to the pump case 100. Specifically, the mounting groove 511 is formed in the support member 510, and the through-hole 522 is formed in the sleeve 520.

[0047] The central axis of the through-hole 522 coincides with the central axis of the mounting groove 511. The distal end of the rotating assembly 12 is rotatably mounted in the through-hole 522, and a gap for fluid communication is provided between the wall of the through-hole 522 of the sleeve 520 and the rotating assembly 12. Here, the cleaning liquid that has entered the pump case 100 can flow out of the pump case 100 through the gap between the rotating assembly 12 and the wall of the through-hole 522.

[0048] The rotating assembly 12 includes a rotating shaft 300 and a rotor 400. The rotation axis of the rotating shaft 300 and the rotation axis of the rotating assembly 12 are aligned. That is, when the rotating assembly 12 rotates stably, the rotation axis of the rotating shaft 300 and the central axis of the housing assembly 11 are essentially aligned. The rotating shaft 300 is rotatably attached to the pump case 100 and has a connecting end 310 for connecting to the impeller 20, allowing the impeller 20 to rotate following the rotating shaft 300. In the illustrated embodiment, the rotating shaft 300 is drilled in a through-hole 522 of a sleeve 520. The rotating shaft 300 extends generally along the axial direction of the pump case 100. The connecting end 310 of the rotating shaft 300 extends outside the pump case 100 or into the cannula 30 and is connected to the impeller 20. The rotation axis of the rotating assembly 12 is the rotation axis of the rotating shaft 300. The rotor 400 is installed in the pump case 100 and fixed to the rotating shaft 300.

[0049] The drive mechanism further includes a stator 200 disposed within the pump case 100. The stator 200 is capable of rotationally driving the rotating assembly 12. In the illustrated embodiment, the stator 200 is located between a support member 510 and a sleeve 520.

[0050] Here, the stator 200 can rotate the rotor 400, and the rotor 400 can be linked to rotate the rotating shaft 300. Specifically, the rotor 400 is magnetic, and the stator 200 can generate a rotating magnetic field that rotates the rotor 400. Here, the rotating shaft 300 is rotatably mounted in the stator 200. The rotor 400 is positioned between a support member 510 and a sleeve 520.

[0051] Referring again to FIG. 2 , in the illustrated embodiment, the rotor 400 includes a first rotor unit 410 and a second rotor unit 420, both of which are fixed to the rotating shaft 300. The first rotor unit 410 and the second rotor unit 420 are installed along the axis of the rotating shaft 300. Here, the stator 200 is located between the first rotor unit 410 and the second rotor unit 420. Both the first rotor unit 410 and the second rotor unit 420 are magnetic, and the stator 200 can generate a rotating magnetic field that rotates the first rotor unit 410 and the second rotor unit 420. Here, at least one of the rotating shaft 300 and the first rotor unit 410 is connected to a rotating head 800. In the illustrated embodiment, the rotating head 800 is fixed to the side of the rotating shaft 300 that is away from the connecting end 310.

[0052] Here, the rotary head 800 and the rotary shaft 300 may be separate bodies, or the rotary head 800 may be fixed to the rotary shaft 300 and the first rotor unit 410 by welding, adhesive, or other methods. In some embodiments, the rotary head 800 may be molded integrally with the rotary shaft 300, which facilitates machining and molding. Alternatively, in other embodiments, the rotary head 800 does not need to be directly connected to the rotary shaft 300; for example, the rotary head 800 may be connected to the first rotor unit 410.

[0053] The drive mechanism further includes a stopper 600 fixed to the rotating assembly 12, which is located between the sleeve 520 and the rotating head 800 and can abut against the sleeve 520 to limit movement of the rotating assembly 12 in a direction away from the mounting groove 511.

[0054] 9 and 10 , specifically, the stopper 600 is fixed to at least one of the rotating shaft 300 and the rotor 400 (specifically, the second rotor unit 420). In other words, the stopper 600 may be directly fixed only to the rotor 400, only to the rotating shaft 300, or to both the rotor 400 and the rotating shaft 300. Because the rotor 400 is fixed to the rotating shaft 300, the stopper 600, the rotating shaft 300, and the rotor 400 rotate and move synchronously. The stopper 600 is located between the rotor 400 and the sleeve 520, and abuts against the sleeve 520, thereby restricting movement of the rotating shaft 300 in a direction away from the mounting groove 511 along the axis of the rotating shaft 300.

[0055] In the illustrated embodiment, the stopper 600 is molded integrally with the rotating shaft 300. Since the overall volume of the blood pump 1 is small, the volume of the stopper 600 is even smaller, which requires high processing precision and makes assembly more difficult. By molding the stopper 600 and the rotating shaft 300 integrally, installation is easier and the fixing operation can be omitted.

[0056] Specifically, stopper 600 is substantially annular, and the central axis of stopper 600 coincides with the axis of rotating shaft 300. Stopper 600 has a stop surface 610 that is an arc-shaped surface, which reduces the contact area with sleeve 520 and reduces wear on both. When stop surface 610 abuts against sleeve 520, movement of rotating shaft 300 along the axis of rotating shaft 300 in a direction approaching impeller 20 is restricted.

[0057] The surface of sleeve 520 facing stopper 600 is locally recessed, and a flow guide groove 524 communicating with through hole 522 of sleeve 520 is formed therein. When stopper 600 abuts against sleeve 520, a portion of flow guide groove 524 is not covered by stopper 600. Therefore, even though there is a problem that stopper 600 blocks the gap between through hole 522 of sleeve 520 and rotating shaft 300 when stopper 600 abuts against sleeve 520 and obstructs the flow of cleaning liquid, the portion of flow guide groove 524 that is not covered by stopper 600 achieves fluid communication when stopper 600 abuts against sleeve 520, and it is possible to ensure smooth flow of cleaning liquid. In addition, by forming a flow guide groove 524 locally on the surface of the sleeve 520 facing the stopper 600, the cleaning liquid can flow more smoothly between the stopper 600 and the sleeve 520, which serves to lubricate the contact surfaces between the stopper 600 and the sleeve 520, reduces friction between the stopper 600 and the sleeve 520, and reduces the problem of wear caused by friction between the stopper 600 and the sleeve 520.

[0058] In the illustrated embodiment, three guide grooves 524 are provided, and the three guide grooves 524 are connected to the through holes 522 and are uniformly arranged relative to the through holes 522. The presence of the three guide grooves 524 allows more cleaning liquid to be introduced, which improves the effect of lubricating the contact surface between the stop surface 610 and the sleeve 520, reducing friction and also reducing the contact area between the sleeve 520 and the stop surface 610, thereby reducing wear.

[0059] Of course, in other embodiments, the number of the flow guide grooves 524 may be one, two, or more than three, and is not limited here.

[0060] The configuration of the rotary head 800 will be specifically described with reference to the following embodiment.

[0061] Example 1 3, the rotating head 800 includes a ball head portion 800a, which is rotatably mounted in the mounting groove 511 and slidably abuts against the bottom wall 512 and the side wall 513, respectively. In the illustrated embodiment, specifically, the first spherical wall 810 of the ball head portion 800a abuts against both the side wall 513 and the bottom wall 512. The cylindrical side wall 513 and the flat bottom wall 512 of the mounting groove 511 are perpendicular to each other. The first spherical wall 810 is a hemispherical surface of a sphere on which at least the first spherical wall 810 is located, and the volume of the ball head portion 800a is at least half the volume of the sphere on which the first spherical wall 810 is located. The contact point between the first spherical wall 810 and the side wall 513 is located at the maximum diameter cross section of the ball head portion 800a, and the diameter of the maximum diameter cross section is equal to the diameter of the sphere on which the ball head portion 800a is located. When the rotating head 800 rotates, the first spherical wall 810 and the side wall 513 make line contact, which reduces contact and wear. The contact point between the first spherical wall 810 and the bottom wall 512 can be considered to be point contact, which reduces friction and wear with the bottom wall 512. The contact of the ball head portion 800a with the bottom wall 512 achieves axial positional restriction with respect to the proximal end of the rotating assembly 12. Furthermore, because the ball head portion 800a is housed within the mounting groove 511, the radial positional restriction is stable and the ball head portion 800a rolls more smoothly within the mounting groove 511.

[0062] In this embodiment, the volume of the ball head portion 800a is larger than half of the sphere in which the first spherical wall 810 is located, thereby minimizing the possibility that the corner formed at the connection point between the surface of the ball head portion 800a away from the bottom wall 512 of the mounting groove 511 and the first spherical wall 810 will come into contact with the side wall 513 of the mounting groove 511, causing scratches and wear to the side wall 513 of the mounting groove 511.

[0063] More specifically, the mounting groove 511 further has an opening 514 and an arcuate wall 513a, the rotating head 800 is drilled in the opening 514, the arcuate wall 513a is disposed adjacent to the opening 514 and extends away from the central axis of the opening 514, and the side wall 513 is connected to the arcuate wall 513a and the bottom wall 512. In this embodiment, the arcuate wall 513a is a rounded configuration provided on the edge of the opening 514. During rotation of the rotating assembly 12, the distal end of the rotating assembly 12 vibrates, causing the rotating head 800 at the proximal end of the rotating assembly 12 to yaw in the radial direction. This causes the rotating head 800 to swing away from the rotation axis of the rotating assembly 12, which is rotating stably, and there is a risk that the rotating head 800 will be locked in the mounting groove 511. By providing the arc-shaped wall 513a (rounded structure) on the mouth 514, the diameter of the mouth 514 can be relatively enlarged and the wall surface can be made smooth, providing space for the rotating head 800 to yaw radially, reducing the risk of the rotating head 800 being locked, while also reducing the risk of the rotating head 800 being scratched and worn by the opening edge of the mounting groove if it is not rounded when it yaws radially.

[0064] 3, when the rotating assembly 12 rotates stably, the distance in the rotational axis direction of the rotating assembly 12 from contact point A where the first spherical wall 810 contacts the side wall 513 to the connection line between the side wall 513 and the bottom wall 512 is 60% to 75% of the distance from the opening 514 to the connection line between the side wall 513 and the bottom wall 512. Specifically, contact point A where the first spherical wall 810 contacts the side wall 513 is the contact point where the ball head portion 800a contacts the side wall 513. By positioning the contact point in this manner, it is possible to reduce the risk of the rotating head 800 moving axially and becoming misaligned from the mounting groove 511 when it rotates.

[0065] In this embodiment, the bottom wall 512 is a plane perpendicular to the side wall 513, the first spherical wall 810 contacts the bottom wall 512 and the side wall 513, respectively, the distance from the contact point A where the first spherical wall 810 contacts the side wall 513 to the connection line between the side wall 513 and the bottom wall 512 is the radius of the sphere on which the ball head portion 800a is located and is defined as L, and the distance from the mouth portion 514 to the connection line between the side wall 513 and the bottom wall 512 is the depth of the mounting groove 511 and is defined as L1, and is 60%≦L / L1≦75%.

[0066] Specifically, the distance from contact point A where first spherical wall 810 contacts side wall 513 to the connection line between side wall 513 and arcuate wall 513a is 0.01 mm to 0.015 mm. The distance from the connection line between side wall 513 and arcuate wall 513a to the connection line between side wall 513 and bottom wall 512 is defined as L2, that is, the difference between L2 and L is 0.01 mm to 0.015 mm. By installing in this manner, it is possible to provide mounting groove 511 with an appropriate depth and reduce the risk of rotating head 800 moving and deviating from mounting groove 511. Furthermore, movement of rotating head 800 can also reduce the risk of rotating head 800 deviating from the abutment between mounting groove 511 and side wall 513.

[0067] Referring to FIG. 4, the ball head portion 800a is rotatably housed in the mounting groove 511, and the radius of the sphere in which the ball head portion 800a is located is equal to or less than the depth of the mounting groove 511, so that the ball head portion 800a is completely housed in the mounting groove 511 and the rotational stability of the ball head portion 800a can be increased.

[0068] The rotary head 800 further includes a rod portion 850 connected to the ball head portion 800a, and the rod portion 850 is drilled into the opening 514 of the mounting groove 511. Specifically, one end of the rod portion 850 remote from the ball head portion 800a is connected to the rotary shaft 300 or the first rotor unit 410. In the illustrated embodiment, specifically, the one end of the rod portion 850 remote from the ball head portion 800a is fixed to the rotary shaft 300 (specifically, the end remote from the connecting end 310 of the rotary shaft 300). In this embodiment, the rod portion 850 is a columnar portion similar to the rotary shaft 300, and the rotary shaft 300, the rod portion 850, and the ball head portion 800a are integrally molded.

[0069] To further reduce the risk of the rotating head 800 locking when yawing radially and the risk of the rotating head 800 colliding with the edge of the mouth 514 of the mounting groove 511, a recess 820 is formed at one end of the rod portion 850 adjacent to the ball head portion 800a, the recess 820 being drilled into the mouth 514 of the mounting groove 511, and the width of the cross section of the recess 820 in a direction perpendicular to the rotation axis of the rotating shaft 300 is smaller than the diameter of the sphere on which the ball head portion 800a is located. The rotation axis of the rotating shaft 300 is also the rotation axis of the rotating assembly 12.

[0070] When the rotating assembly 12 is in a non-operating state, the cross section of the side wall 513 in the axial direction of the rotating shaft 300 is parallel to the rotation axis of the rotating shaft 300, and the diameter of the sphere on which the ball head portion 800a is located is also the width of the mounting groove 511. In this embodiment, the diameter of the sphere on which the ball head portion 800a is located is defined as R1, which is also the width of the mounting groove 511, and the diameter of the recess portion 820 is defined as R2, and R1 <R2となる。

[0071] When the rotating assembly 12 yaws in a rotational state, the ball head portion 800a can roll within the mounting groove 511, and because the diameter of the recess 820 is smaller than the width of the mounting groove 511, the presence of the recess 820 increases the distance between the rod portion 850 and the mouth portion 514 during yaw, allowing a larger yaw angle of the rod portion 850, raising the upper limit of the yaw angle and accommodating a larger radial yaw distance.

[0072] Furthermore, under the premise that the condition for adapting to yaw is satisfied, the diameter of the recess 820 must not be too small, as if the recess 820 is too thin, it will not have enough strength and will be easily broken. By setting the diameter of the recess 820 within the range of 75% to 85% of the diameter of the sphere where the ball head portion 800a is located, i.e., 75%≦R1 / R2≦85%, not only can the recess 820 adapt to yaw and reduce the risk of collision with the edge of the mouth portion 514, but the recess 820 can also have sufficient strength.

[0073] 5, in the direction of the rotation axis of the rotating shaft 300, the recess 820 has a certain axial length, and the distance from one end of the recess 820 remote from the ball head portion 800a to the other end of the ball head portion 800a remote from the recess 820 is equal to or greater than the depth of the mounting groove 511. In this embodiment, the depth of the mounting groove 511 is defined as L4, and the rotating shaft 300 is connected to the first rotor unit 410, and thus the rod portion 850 is also connected to the first rotor unit 410. The recess 820 is provided between the first rotor unit 410 and the support member 510, extends from within the mounting groove 511 to the first rotor unit 410, and has a certain length. The distance from one end of the recess 820 away from the ball head portion 800a to the other end of the ball head portion 800a away from the recess 820 is defined as L3, and by making L3 > L4, when the ball head portion 800a abuts against the bottom wall 512 of the mounting groove 511, the distal end of the recess 820 away from the bottom wall 512 is higher than the position of the mouth portion 514.As a result, even if the rotating shaft 300 yaws to the maximum angle, it will not collide with the edge of the mouth portion 514, and the risk of the rotating head 800 being locked is reduced.

[0074] Specifically, since L3>L4, a portion of the recess 820 protrudes from the mounting groove 511, i.e., the rod portion 850 protrudes from the mounting groove 511, and the length of the entire rotating head 800 in the axial direction of the rotating shaft 300 is greater than the depth of the mounting groove 511. In the illustrated embodiment, specifically, a stop surface 860 is formed on the side of the rod portion 850 away from the rotating head 800, a first shaft hole 411 is formed in the first rotor unit 410, a portion of the rod portion 850 is fitted into the first shaft hole 411, and the stop surface 860 abuts against the side of the first rotor unit 410 closer to the support member 510. In addition, since the rod portion 850 protrudes from the mounting groove 511 and is positioned between the first rotor unit 410 and the support member 510, and the first rotor unit 410 and the mouth portion 514 of the mounting groove 511 are spaced a certain distance apart, interference and friction with the support member 510 are avoided when the first rotor unit 410 rotates.

[0075] In the above-described first embodiment, it is possible to simply install the arc-shaped wall 513a on the mouth portion 514, or to simply install the recess 820 on the rotary head 800, or to install both, but this is not limited here.

[0076] In addition, in other embodiments, the bottom wall 512 may be a curved wall. Specifically, the bottom wall 512 may be a convex or concave arc surface. If the bottom wall 512 is a convex arc surface, the rotary head 800 abuts against the convex arc surface, and the first spherical wall 810 abuts against the convex arc surface. Alternatively, if the bottom wall 512 is a concave arc surface, the rotary head 800 abuts against the concave arc surface, and the first spherical wall 810 abuts against the concave arc surface. Alternatively, if the bottom wall 512 is a convex arc surface and the side of the rotary head 800 facing the bottom wall is a flat wall, the flat wall can also abut against the convex arc surface of the bottom wall 512.

[0077] 6, 7, and 8, the drive mechanism 10 further includes a mounting seat 700 fixed to the pump case 100. The mounting seat 700 has a mounting cavity 710 and a fluid supply hole 720 communicating with the mounting cavity 710. The support member 510 is mounted in the mounting cavity 710, and a flow path is formed in the mounting seat 700. In this embodiment, the flow path is a first flow path 730 communicating with the fluid supply hole 720. The cleaning liquid that passes through the fluid supply hole 720 can flow into the internal cavity of the pump case 100 via the first flow path 730. Here, one end of the fluid supply hole 720 remote from the mounting cavity 710 communicates with the cleaning conduit of the conduit 40, allowing the cleaning liquid to pass through the fluid supply hole 720 and the first flow path 730 and enter the internal cavity of the pump case 100.

[0078] Specifically, one end of the first flow passage 730 communicates with the gap between the support member 510 and the cavity bottom 712 of the mounting cavity 710, and the other end communicates with the internal cavity of the pump case 100. In the illustrated embodiment, the first flow passage 730 is formed by a local recess in the cavity wall of the mounting cavity 710. In the illustrated embodiment, the number of first flow passages 730 is two, and the two first flow passages 730 are installed opposite each other. It should be understood that the number of first flow passages 730 can be adjusted according to design needs; for example, in some embodiments, the number of first flow passages 730 may be one or more than two.

[0079] Specifically, the mounting cavity 710 has a cavity bottom 712, one of the openings of the liquid supply hole 720 is located at the cavity bottom 712 of the mounting cavity 710, and a support step 713 is provided within the mounting cavity 710, which abuts against the support member 510, thereby separating the support member 510 from the cavity bottom 712 by a certain distance and more reliably ensuring the smooth flow of cleaning liquid. The support member 700 is provided within the mounting cavity 710, and the support step 713 abuts against the surface of the support member 510 that is far from the sleeve 520.

[0080] Example 2 The second embodiment is generally similar to the first embodiment except for the configuration of the rotary head 800 and the configuration of the mounting groove 511.

[0081] 11 and 12 , the rotating head 800 includes a ball head portion 800a, which is inserted into the opening 514 and slidably abuts against the bottom wall 512 and the side wall 513, respectively. In the illustrated embodiment, specifically, the first spherical wall 810 of the ball head portion 800a abuts against both the side wall 513 and the bottom wall 512. The side wall 513 of the mounting groove 511 is a cylindrical surface, and the bottom wall 512 is a plane perpendicular to the side wall 513. The diameter of the opening 514 of the mounting groove 511 is equal to or smaller than the diameter of the sphere in which the ball head portion 800a is located. This allows a portion of the ball head portion 800a to be outside the opening 514, and at least a portion of the first spherical wall 810 to be outside the opening 514 as well. Therefore, the ball head portion 800a is not completely restricted by the side wall 513 in the radial direction. By installing it in this manner, when the rotating assembly 12 yaws, the first spherical wall 810 can slide within the mounting groove 511 and along the mouth portion 514, and the ball head portion 800a is not restricted by the mouth portion 514 of the mounting groove 511, thereby avoiding locking.

[0082] In this embodiment, the volume of the ball head portion 800a is greater than half the volume of the sphere on which the first spherical wall 810 is located. The contact point B where the first spherical wall 810 meets the side wall 513 is lower than the maximum diameter of the cross section of the ball head portion 800a, i.e., the contact point B is lower in the axial direction than the radius of the sphere on which the ball head portion 800a is located. The diameter of the opening 514 of the mounting groove 511 is smaller than the diameter of the sphere on which the ball head portion 800a is located. This arrangement minimizes the possibility of the corner formed at the connection point between the surface of the ball head portion 800a away from the bottom wall 512 of the mounting groove 511 and the first spherical wall 810 coming into contact with the side wall 513 of the mounting groove 511, causing scratches and wear to the side wall 513 of the mounting groove 511. In addition, the volume of the ball head portion 800a drilled into the mounting groove 511 can be made smaller than half the volume of the sphere in which the first spherical wall 810 is located, so that when the rotating assembly 12 yaws, the first spherical wall 810 can slide more smoothly within the mounting groove 511, further reducing the risk of it being restricted and locked by the opening portion 514.

[0083] Specifically, the diameter of the sphere on which ball head portion 800a is located is defined as R3, the diameter of opening 514, i.e., the width of mounting groove 511, is defined as R4, the radius of the sphere on which ball head portion 800a is located is defined as r3, and the depth of mounting groove 511 is defined as L5, with R3 > R4 and r3 > L5. Furthermore, in the illustrated embodiment, the volume of ball head portion 800a is larger than that of mounting groove 511, and the pressure points received when it wears against bottom wall 512 and side wall 513 can be dispersed over ball head portion 800a, resulting in good wear resistance and a long lifespan.

[0084] Furthermore, the diameter of the opening 514 of the mounting groove 511 is at least half the diameter of the sphere in which the ball head portion 800a is located. There is a minimum range for the diameter of the opening 514. If the diameter of the opening 514 is too small, the depth and width of the rotary head 800 in the mounting groove 511 will be too small, and the ability to restrict the axial or radial position of the rotary head 800 rotating at high speed will be too weak, making it easy for the rotary head 800 to deviate from the mounting groove 511.

[0085] 12, a stop surface 860 is provided on the rotary head 800, and the stop surface 860 is located on the side away from the bottom wall 512 of the mounting groove 511 of the rotary head 800, and the stop surface 860 and the opening 514 of the mounting groove 511 are spaced apart by a certain distance. When the first rotor unit 410 abuts against the stop surface 860, the first rotor unit 410 and the opening 514 of the mounting groove 511 are spaced apart by a certain distance.

[0086] In this embodiment, the rotary head 800 includes a rod portion 850 connected to the ball head portion 800a. Specifically, the rod portion 850 and the rotary shaft 300 are separate bodies, and one end of the rod portion 850 remote from the ball head portion 800a is fixed to the first rotor unit 410, and one end of the rotary shaft 300 remote from the connecting end 310 is also fixed to the first rotor unit 410. In the illustrated embodiment, the first rotor unit 410 has a first shaft hole 411, and the rod portion 850 and the rotary shaft 300 are respectively inserted into the first shaft hole 411. In this case, the stopper 600 may be integrally molded with the rotary shaft 300, but for better processing accuracy, the rotary shaft 300 may be assembled from the distal end side of the first shaft hole 411.

[0087] Specifically, the cross-sectional width of rod portion 850 in a direction perpendicular to the rotation axis of rotating shaft 300 is smaller than the diameter of the sphere on which ball head portion 800a is located, and a stop surface 860 that abuts against the side of first rotor unit 410 facing support member 510 is formed between rod portion 850 and ball head portion 800a, thereby providing a positional restriction effect for rotary head 800 during assembly. First rotor unit 410 and opening 514 of mounting groove 511 are spaced apart by a certain distance, separating support member 510 from first rotor unit 410 and effectively preventing interference and friction with support member 510 when first rotor unit 410 rotates.

[0088] Example 3 The third embodiment is generally similar to the second embodiment except for the configuration of the rotary head 800 and the configuration of the support member 510.

[0089] 13 to 15, the rotary head 800 further has a second spherical wall 840 connected to the first spherical wall 810, and slidably abuts against the side wall 513 and the bottom wall 512. Specifically, the first spherical wall 810 abuts against the side wall 513, and the second spherical wall 840 abuts against the bottom wall 512, and is installed so that the second spherical wall 840 faces toward the bottom wall 512.

[0090] Specifically, a convex ring 830 is installed on the side of the rotary head 800 facing the bottom wall 512, and the central axis of the convex ring 830 coincides with the central axis of rotation of the rotary assembly 12. A second spherical wall 840 is installed on the convex ring 830. In this embodiment, the second spherical wall 840 is a convex arc surface that is installed so as to surround the convex ring 830. When the convex ring 830 abuts against the bottom wall 512, the second spherical wall 840 is in contact with the bottom wall 512. With this installation, the contact between the bottom wall 512 and the rotary head 800 can be considered as line contact, reducing friction and wear. Furthermore, because the convex ring 830 is installed around the circumference, the contact area with the bottom wall 512 is evenly distributed, preventing excessive pressure concentration at the frictional parts, further reducing wear and improving the life of the rotary head 800.

[0091] More specifically, the inner diameter of the convex ring 830 is equal to or greater than half the diameter of the sphere on which the first spherical wall 810 is located. By installing it in this manner, when the second spherical wall 840 on the convex ring 830 contacts the bottom wall 512, the circumference of the circle enclosed by the convex ring 830 is large, and the pressure exerted by the convex ring 830 on the bottom wall 512 is dispersed and not concentrated too much, resulting in better wear resistance.

[0092] In addition, in other embodiments, the convex ring 830 may be replaced by a plurality of convex spheres uniformly arranged in the circumferential direction around the central axis of rotation of the rotating assembly 12. The same effect can also be achieved by installing the second spherical wall 840 on the convex sphere, and the number of convex spheres may be three, four, or more.

[0093] The configuration of the convex ring 830 in the third embodiment may be applied to the first embodiment, and is not limited thereto.

[0094] 13 and 15, in this embodiment, a flow path that is a second flow path 516 is opened in the support member 510, and the second flow path 516 on the support member 510 has a first opening 515 that communicates with the mounting groove 511 and a second opening 517 that communicates with the liquid supply hole 720, and the rotary head 800 is disposed so as to avoid the position of the first opening 515. Specifically, one end of the second flow path 516 communicates with the gap between the support member 510 and the cavity bottom 712 of the mounting cavity 710, and the other end communicates with the mounting groove 511. Here, the cleaning liquid can pass through the liquid supply hole 720, the second opening 517, the second flow path 516, and the second opening 515 and enter the mounting groove 511. The cleaning liquid entering between the mounting groove 511 and the rotary head 800 serves as a lubricant and heat dissipation agent, reducing friction between the rotary head 800 and the mounting groove 511, dissipating generated heat, and reducing wear between the rotary head 800 and the mounting groove 511. Furthermore, the rotary head 800 does not cover the first opening 515, ensuring smooth entry of the cleaning liquid and preventing wear due to contact with the edge of the first opening 515. In the illustrated embodiment, there are two second flow paths 516, and the two second flow paths 516 are arranged opposite each other. It should be understood that the number of second flow paths 516 can be adjusted according to design needs. For example, in some embodiments, the number of second flow paths 516 may be one or more than two.

[0095] It is possible to provide both the first flow path 730 on the mounting seat 700 and the second flow path 516 on the support member 510, or only one of them. When both are provided, the cleaning liquid enters the mounting cavity 710 from the liquid supply hole 720 and then splits into two streams, one of which flows into the mounting groove 511 of the support member 510 via the second flow path 516, and the other of which flows out via the first flow path 730.

[0096] 15 and 16, when the support member 510 is formed of two structures, the support member 510 includes a collar 518 and a bottom plate 519, the bottom plate 519 is connected to one end of the collar 518 and surrounds the mounting groove 511 together with the collar 518, at least a part of the inner wall of the collar 518 forms a side wall 513, and the bottom wall 512 is provided on the bottom plate 519.

[0097] Specifically, the collar 518 and the bottom plate 519 may be adhered or may abut against each other. First, this facilitates processing and allows for more flexible material selection during molding. The two may be made of the same material, such as ceramic, or different materials. For example, the collar 518 may be made of ceramic and the bottom plate 519 may be made of metal, with a diamond coating applied to the surface of the bottom plate 519 to enhance surface roughness. Second, during assembly, the rotary head 800 can be inserted from either of two axial directions of the collar 518, which is more convenient.

[0098] When the support member 510 is configured from two structures, the second flow channel 516 provided on the bottom plate 519 is a notch formed extending from the side wall of the bottom plate 519 to the center of the bottom plate 519, the second flow channel 516 communicates with the liquid supply hole 720, and the rotating head 800 is positioned to avoid the position of the second flow channel 516. Alternatively, in another embodiment, the second flow channel 516 provided on the collar 518 is a notch formed extending from the side wall of the collar 518 to the center of the collar 518, the second flow channel 516 communicates with the liquid supply hole 720, and the rotating head 800 is positioned to avoid the position of the second flow channel 516.

[0099] The configuration of the support member 510 of the third embodiment may be applied to the first and second embodiments, and is not limited here.

[0100] The above is merely a preferred embodiment of the present application, and does not limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application should be included within the protection scope of the present application.

Claims

1. A drive mechanism comprising: a housing assembly including a mounting groove having a bottom wall and a side wall, and a through hole; a rotating assembly including a distal end rotatably inserted into the through hole, and a proximal end having a rotating head, the rotating head being rotatably mounted in the mounting groove and slidably abutting the bottom wall and the side wall, the rotating head having a first spherical wall in contact with the side wall.

2. 2. The drive mechanism according to claim 1, wherein a cross section of the mounting groove along a direction perpendicular to the rotation axis of the rotary assembly is circular or rectangular.

3. 2. The drive mechanism of claim 1, wherein the side walls are parallel to the axis of rotation of the rotating assembly.

4. 2. The drive mechanism according to claim 1, wherein the first spherical wall is tangent to the bottom wall and / or the bottom wall is perpendicular to the side wall.

5. 2. The drive mechanism according to claim 1, wherein the mounting groove further has a mouth portion and an arcuate wall, the rotary head is drilled into the mouth portion, the side wall connects the arcuate wall and the bottom wall, and the arcuate wall is adjacent to the mouth portion.

6. 6. The drive mechanism according to claim 5, wherein a distance from a contact point where the first spherical wall meets the side wall to a connection line between the side wall and the bottom wall is 60% to 75% of a distance from the mouth to a connection line between the side wall and the bottom wall, and a distance from a contact point where the first spherical wall meets the side wall to a connection line connecting the side wall and the arc-shaped wall is 0.01 mm to 0.015 mm.

7. 2. The drive mechanism according to claim 1, wherein the rotating head includes a ball head portion and a rod portion connected to the ball head portion, the rod portion being inserted into an opening of the mounting groove, the ball head portion being rotatably received in the mounting groove, the rod portion having a recess formed at one end thereof adjacent to the ball head portion, the recess being inserted into the opening of the mounting groove, and a cross-sectional width of the recess in a direction perpendicular to the rotation axis of the rotating assembly being smaller than a diameter of a sphere on which the ball head portion is located.

8. 8. The drive mechanism according to claim 7, wherein a cross-sectional width of the recess in a direction perpendicular to the rotation axis of the rotating assembly is 75% to 85% of a diameter of a sphere on which the ball head portion is located.

9. 2. The drive mechanism according to claim 1, wherein the rotary head includes a ball head portion drilled into an opening of the mounting groove, and the opening of the mounting groove has a diameter equal to or smaller than a diameter of the sphere in which the ball head portion is located and equal to or larger than half the diameter of the sphere in which the ball head portion is located.

10. 2. The drive mechanism according to claim 1, wherein the rotary head further comprises a second spherical wall connected to the first spherical wall, the second spherical wall slidably abutting against the bottom wall of the mounting groove, and the second spherical wall contacting the bottom wall.

11. 11. The drive mechanism according to claim 10, wherein the rotary head further comprises a convex ring having a rotation axis coinciding with that of the rotary assembly, and the second spherical wall is mounted on the convex ring.

12. 12. The drive mechanism according to claim 11, wherein the inner diameter of the convex ring is equal to or greater than half the diameter of the sphere on which the first spherical wall is located.

13. 2. The drive mechanism of claim 1, wherein the housing assembly includes a pump case and a support member attached to the pump case, the mounting groove being formed in the support member, the drive mechanism further includes a mounting seat fixed to the pump case, the mounting seat having a mounting cavity and a fluid supply hole communicating with the mounting cavity, the support member being attached within the mounting cavity, and at least one of the mounting seat and the support member having a flow path communicating with the fluid supply hole.

14. 14. The drive mechanism according to claim 13, wherein the flow path is opened in the support member, the flow path on the support member has a first opening communicating with the mounting groove and a second opening communicating with the liquid delivery hole, and the rotary head is positioned to avoid the position of the first opening.

15. 14. The drive mechanism according to claim 13, wherein the support member includes a collar and a bottom plate connected to one end of the collar, the mounting groove is formed by an enclosure formed by the bottom plate and the collar, at least a portion of an inner wall of the collar forms the side wall, and the bottom wall is provided on the bottom plate.

16. 16. The drive mechanism according to claim 15, wherein the flow path communicating with the mounting groove is provided in the bottom plate, the flow path on the bottom plate is formed so as to extend from a side surface of the bottom plate to a center of the bottom plate, and the rotary head is positioned to avoid the position of the flow path on the bottom plate.

17. 2. The drive mechanism of claim 1, wherein the rotating assembly further includes a rotating shaft and a rotor, the rotating shaft having a proximal end and a distal end rotatably inserted into the through hole, the rotor including a first rotor unit fixed to the rotating shaft, and at least one of the first rotor unit and the rotating shaft being coupled to the rotating head.

18. 18. The drive mechanism according to claim 17, wherein the rotary head is provided with a stop surface, the stop surface being located on a side of the rotary head away from the bottom wall of the mounting groove, and the stop surface and an opening of the mounting groove being spaced apart by a fixed distance, and the first rotor unit abuts against the stop surface, thereby spaced apart by a fixed distance from the opening of the mounting groove.

19. 2. The drive mechanism of claim 1, wherein the housing assembly includes a pump case and a sleeve attached to the pump case, the through hole being provided in the sleeve, and the drive mechanism further includes a stopper fixed to the rotating assembly, the stopper being located between the sleeve and the rotating head and abutting the sleeve, thereby limiting movement of the rotating assembly in a direction away from the mounting groove.

20. 1. A blood pump comprising: an impeller and a drive mechanism; The drive mechanism includes: a housing assembly including a mounting groove having a bottom wall and a side wall, and a through hole; a rotating assembly having a distal end rotatably inserted into the through hole and a proximal end having a rotating head, the rotating head being rotatably mounted in the mounting groove and slidably abutting the bottom wall and the side wall, the rotating head having a first spherical wall in contact with the side wall; The blood pump is characterized in that the impeller is connected to the rotating assembly and is configured to be able to rotate following the rotating assembly.

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