Testing device

文档序号：541510 发布日期：2021-06-04 浏览：44次中文

阅读说明：本技术 测试装置 (Testing device ) 是由谢端卿余顺周于 2021-01-22 设计创作，主要内容包括：本发明提供一种测试装置,包括底座,及分别连接至所述底座的驱动机构与磁力机构；所述磁力机构包括固定架,及可转动的连接至所述固定架的叶轮,所述叶轮上设有磁体；所述驱动机构包括安装架,及分别连接至所述安装架的控制件、电机、隔离件及限位件；所述电机包括定子,所述定子包括多个环绕所述限位件布置的柱,及围绕在每一所述柱外周的线圈绕组,所述限位件的外周设置有多个限位卡槽,每一所述柱收容在对应的所述限位卡槽中,所述安装架包括容纳部,所述容纳部具有容纳腔,所述定子装配在所述容纳腔内,所述隔离件位于所述定子与所述容纳腔之间。本发明的测试装置,可准确获得叶轮磁体和电机定子的轴向间距与叶轮转速的对应关系。(The invention provides a testing device, which comprises a base, a driving mechanism and a magnetic mechanism, wherein the driving mechanism and the magnetic mechanism are respectively connected to the base; the magnetic mechanism comprises a fixed frame and an impeller which is rotatably connected to the fixed frame, and a magnet is arranged on the impeller; the driving mechanism comprises a mounting rack, and a control piece, a motor, an isolating piece and a limiting piece which are respectively connected to the mounting rack; the motor includes the stator, the stator includes a plurality of encircles the post that the locating part arranged, and around each the coil winding of post periphery, the periphery of locating part is provided with a plurality of spacing draw-in grooves, each the post is acceptd and is corresponded in the spacing draw-in groove, the mounting bracket is including the portion of holding, the portion of holding has and holds the chamber, the stator assembly is in hold the intracavity, the separator is located the stator with hold between the chamber. The testing device can accurately obtain the corresponding relation between the axial distance between the impeller magnet and the motor stator and the rotating speed of the impeller.)

1. A testing device is characterized by comprising a base, a driving mechanism and a magnetic mechanism, wherein the driving mechanism and the magnetic mechanism are respectively connected to the base;

the magnetic mechanism comprises a fixed frame and an impeller which is rotatably connected to the fixed frame, and a magnet is arranged on the impeller;

the driving mechanism comprises a mounting rack, and a control piece, a motor, an isolating piece and a limiting piece which are respectively connected to the mounting rack; the motor comprises a stator, the stator comprises a plurality of columns arranged around the limiting piece, and a coil winding surrounding the periphery of each column, the coil winding is electrically connected with the control piece, and the coil winding generates a rotating magnetic field interacting with the magnet to enable the impeller to rotate;

the periphery of locating part is provided with a plurality of spacing draw-in grooves, each the post is acceptd and is corresponded in the spacing draw-in groove, the mounting bracket is including the portion of holding, the portion of holding has and holds the chamber, the stator assembly is in hold the intracavity, the separator is located the stator with hold between the chamber.

2. The testing device of claim 1, wherein the mounting frame further comprises a mounting portion and a connecting portion connected with each other, the connecting portion is used for being connected with the base, the control member and the accommodating portion are respectively connected to the mounting portion, and a through hole communicated with the accommodating cavity is formed in the mounting portion;

the driving mechanism further comprises a positioning frame, the positioning frame comprises a positioning column, one end of the positioning column is connected to the bottom wall, opposite to the through hole, of the accommodating cavity, the other end of the positioning column faces towards one side of the through hole and extends, and the positioning column is sleeved with the limiting part.

3. The testing device as claimed in claim 2, wherein the positioning frame further includes a cover plate, the positioning posts are fixed on the cover plate and extend in a direction away from the cover plate, the cover plate is located outside the accommodating portion, a through hole penetrating through the bottom wall is formed in the accommodating portion, and the positioning posts penetrate through the through hole and extend into the accommodating cavity.

4. The testing device of claim 2, wherein the spacer is a cylindrical structure, the spacer is sleeved outside the stator, and a limiting protrusion is arranged on the outer wall of the spacer;

the side wall of the accommodating part is provided with a guide groove extending to the mounting part, the guide groove is communicated with the through hole, and the limiting protrusion is clamped in the guide groove.

5. The testing device of claim 4, wherein a window communicating with the accommodating cavity is formed in a side wall of the accommodating portion, the window extends to the bottom wall, and an avoiding groove is formed in the partition at a position opposite to the window.

6. The testing device of claim 2, further comprising a movement mechanism coupled to the base for adjusting the relative position of the drive mechanism and the magnetic mechanism;

the mounting bracket further comprises a first positioning portion connected to the mounting portion, the fixing frame comprises a second positioning portion, the second positioning portion and the first positioning portion are arranged oppositely, the first positioning portion and the second positioning portion move relatively under the driving of the moving mechanism, and when the first positioning portion and the second positioning portion are mutually nested, the motor and the impeller are basically coaxial.

7. The testing device of claim 6, wherein the base comprises a base plate and a support plate coupled to each other, the moving mechanism is coupled to the base plate, the mounting bracket is coupled to the moving mechanism, and the mounting bracket is coupled to the support plate.

8. The testing device of claim 6, wherein the fixture further comprises:

the first fixed part is used for being connected with the moving mechanism;

a second fixing portion connected to the first fixing portion, the second positioning portion being disposed on the second fixing portion;

a support portion disposed on the second fixing portion and extending toward one side of the motor, the impeller being rotatably connected to the support portion.

9. The testing device of claim 8, wherein the magnetic mechanism further comprises an adjustment bracket, the impeller is rotatably connected to the adjustment bracket, and the adjustment bracket is movably connected to the support portion so that a distance between the impeller and the motor is adjustable;

and a positioning structure is arranged between the adjusting frame and the supporting part, and the positioning structure enables the adjusting frame to be fixedly connected with the supporting part.

10. The testing device of claim 1, wherein the spacer and the stop are both paraffin components.

Technical Field

The invention relates to the field of medical instruments, in particular to a testing device for detecting the corresponding relation between the rotating speed of an impeller of an intravascular blood pump and the axial distance between an impeller magnet and a motor stator.

Background

Intravascular blood pumps, designed for percutaneous insertion into a patient's blood vessel, such as the blood vessels of the arteries or veins of the thigh or armpit, may be advanced into the patient's heart to function as either a left ventricular assist device or a right ventricular assist device. Accordingly, intravascular blood pumps may also be referred to as intracardiac blood pumps.

An intravascular blood pump includes an impeller and a motor that drives the impeller to rotate. The motor includes a housing and a stator within the housing that generates a rotating magnetic field that interacts with magnets on the impeller to rotate the impeller about its axis. When the impeller rotates, blood is conveyed from the blood inflow port of the blood pump to the blood outflow port. When the axial distance between the magnet and the stator becomes smaller, the magnetic density between the magnet and the stator is increased, so that the output power and the torque of the motor are increased, and the rotating speed of the impeller is increased. Because the motor is a static part and does not rotate along with the impeller, when the specific structure of the blood pump is designed, a certain gap needs to be reserved between the impeller and the motor so as to avoid the impeller from touching the motor when rotating; also, if the reserved gap is too small, blood flow may be stagnant in the gap, causing blood clotting and thrombus formation. Therefore, it is desirable to properly design the axial spacing between the impeller magnet and the motor stator so that the impeller has the proper rotational speed without affecting the blood flow in the gap between the motor and the impeller.

Therefore, when the specific structure of the blood pump is designed, the corresponding relation between the axial distance between the impeller magnet and the motor stator and the impeller rotating speed is detected in advance, if the corresponding relation between the impeller magnet and the motor stator is known in advance, the size of the axial distance between the impeller magnet and the motor stator directly reflects the impeller rotating speed, and the specific structure of the blood pump can be designed conveniently. Therefore, how to accurately obtain the corresponding relation between the axial distance between the impeller magnet and the motor stator and the rotating speed of the impeller is a problem to be overcome.

Disclosure of Invention

In view of at least one of the above-mentioned drawbacks, the present application needs to provide a testing apparatus capable of accurately obtaining a corresponding relationship between an axial distance between an impeller magnet and a motor stator and an impeller rotation speed.

The invention provides a testing device, which comprises a base, a driving mechanism and a magnetic mechanism, wherein the driving mechanism and the magnetic mechanism are respectively connected to the base;

the magnetic mechanism comprises a fixed frame and an impeller which is rotatably connected to the fixed frame, and a magnet is arranged on the impeller;

In one embodiment, the mounting frame further comprises a mounting portion and a connecting portion, the mounting portion and the connecting portion are connected, the connecting portion is used for being connected with the base, the control member and the accommodating portion are respectively connected to the mounting portion, and the mounting portion is provided with a through hole communicated with the accommodating cavity;

In an embodiment, the positioning frame further includes a cover plate, the positioning column is fixed on the cover plate and extends in a direction away from the cover plate, the cover plate is located outside the accommodating portion, a through hole penetrating through the bottom wall is formed in the accommodating portion, and the positioning column penetrates through the through hole and extends into the accommodating cavity.

In one embodiment, the spacer is a cylindrical structure, the spacer is sleeved outside the stator, and the outer wall of the spacer is provided with a limiting bulge;

In an embodiment, a window communicated to the accommodating cavity is arranged on a side wall of the accommodating portion, the window extends to the bottom wall, and an avoiding groove is arranged at a position, opposite to the window, on the partition.

In one embodiment, the testing device further comprises a moving mechanism connected to the base and used for adjusting the relative position of the driving mechanism and the magnetic mechanism;

In one embodiment, the base comprises a bottom plate and a supporting plate which are connected, the moving mechanism is connected to the bottom plate, the fixing frame is connected to the moving mechanism, and the mounting frame is connected to the supporting plate.

In one embodiment, the fixture further comprises:

the first fixed part is used for being connected with the moving mechanism;

a second fixing portion connected to the first fixing portion, the second positioning portion being disposed on the second fixing portion;

a support portion disposed on the second fixing portion and extending toward one side of the motor, the impeller being rotatably connected to the support portion.

In one embodiment, the magnetic force mechanism further comprises an adjusting frame, the impeller is rotatably connected to the adjusting frame, and the adjusting frame is movably connected to the supporting part so that the distance between the impeller and the motor can be adjusted;

In an embodiment, the spacer and the position-limiting member are made of paraffin.

The testing device provided by the invention has the following beneficial effects: the testing device is used for simulating the working states of an impeller and a motor stator of a blood pump, and can avoid the inclination of the columns by arranging the plurality of columns around the limiting part and limiting each column in the limiting clamping groove of the limiting part, ensure that the columns are always parallel to the central axis of the stator, and enable the stator to generate a stable rotating magnetic field, thereby ensuring that the impeller can stably run during testing and improving the accuracy of detection data; and, this application sets up the separator between stator and holding the chamber, and the protection coil is not damaged in the assembling process, and impeller steady operation when can further ensureing to test improves the accuracy of testing data to the accurate corresponding relation who obtains impeller magnet and motor stator's axial interval and impeller rotational speed.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive exercise.

Fig. 1 is a schematic structural diagram of a testing apparatus according to a preferred embodiment of the present invention.

FIG. 2 is a cross-sectional view of the test device of FIG. 1;

FIG. 3 is an exploded view of the test apparatus shown in FIG. 1;

FIG. 4 is an exploded view of the motor stator of the drive mechanism of the test apparatus shown in FIG. 3;

FIG. 5 is a schematic structural diagram of a limiting member of a driving mechanism of the testing apparatus shown in FIG. 3;

FIG. 6 is a schematic structural diagram of a base of the testing device shown in FIG. 3;

FIG. 7 is an exploded view of the drive mechanism of the test device shown in FIG. 3;

FIG. 8 is a cross-sectional view of a mounting bracket of the drive mechanism of FIG. 7;

FIG. 9 is a schematic structural view of a mounting bracket of the drive mechanism of FIG. 7;

FIG. 10 is an enlarged view of section A of the test apparatus of FIG. 2;

FIG. 11 is a schematic view of the spacer of the drive mechanism of FIG. 7;

FIG. 12 is an exploded view of the magnetic mechanism of the test device of FIG. 3;

fig. 13 is a cross-sectional view of an adjustment bracket of the magnetic mechanism shown in fig. 12.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 and 2, the present invention provides a testing apparatus 100 for simulating the operating states of an impeller and a motor stator of a blood pump, so as to accurately obtain the corresponding relationship between the axial distance between the impeller magnet and the motor stator and the rotating speed of the impeller.

Referring to fig. 3, the testing apparatus 100 at least includes a base 20, a driving mechanism 30, a magnetic mechanism 40 and a moving mechanism 50.

Wherein, the moving mechanism 50 and the driving mechanism 30 are respectively installed on the base 20, the magnetic mechanism 40 is installed on the moving mechanism 50, and the relative position of the driving mechanism 30 and the magnetic mechanism 40 can be adjusted through the moving mechanism 50.

The magnetic mechanism 40 at least includes a fixing frame 41 and an impeller 42 rotatably connected to the fixing frame 41, and the impeller 42 is provided with a magnet.

The driving mechanism 30 at least includes a mounting bracket 31, and a control member 32, a motor 33, a limiting member 34 and a spacer 35 respectively connected to the mounting bracket 31.

Referring to fig. 4, the motor 33 includes a stator 330, the stator 330 includes a plurality of posts 331 disposed around the position-limiting member 34, and a coil winding 332 disposed around the outer periphery of each post 331. The coil windings 332 are electrically connected to the control member 32, and the coil windings 332 generate a rotating magnetic field that interacts with the magnets to rotate the impeller. Specifically, the coil winding 332 includes a plurality of coils, each of which is wound outside the corresponding post 331, and the plurality of coils are sequentially controlled by the control member 32 to create a rotating magnetic field for driving the impeller 42.

Referring to fig. 5, the limiting member 34 is provided with a plurality of limiting slots 341 on the periphery thereof, and each column 331 is received in the corresponding limiting slot 341. Referring to fig. 3 again, the mounting bracket 31 includes a receiving portion 312, a receiving cavity is formed in the receiving portion 312, the stator 330 is assembled in the receiving cavity, and the spacer 35 is located between the stator 330 and the receiving cavity.

In the test process, if the column 331 of the stator 330 is inclined with respect to the central axis of the stator 330, the rotating magnetic field may be unstable, which may cause problems of slow rotation, uneven rotation, and loud noise of the impeller 42. This application makes a plurality of posts 331 encircle locating part 34 and arranges to with each post 331 spacing in the spacing draw-in groove 341 that corresponds, can avoid post 331 to incline, make post 331 be on a parallel with stator 330's the central axis all the time, thereby improve the accuracy of detected data, the corresponding relation of the axial spacing of accurate acquisition impeller magnet and motor stator and impeller rotational speed.

In the assembling process, when the stator 330 is placed in the accommodating cavity of the accommodating part 312, the inner wall of the accommodating cavity easily scratches the coil, which causes instability of the rotating magnetic field and affects the operation of the impeller 42. According to the motor stator, the isolating piece 35 is arranged between the stator 330 and the accommodating cavity, so that the coil can be protected from being damaged in the assembling process, and the accuracy of detection data is improved.

Referring to fig. 3, the magnetic structure 40 further includes an adjusting bracket 45, the adjusting bracket 45 is disposed opposite to the mounting bracket 31, and the impeller 42 is rotatably mounted on the adjusting bracket 45. The adjusting frame 45 is movably connected to the fixing frame 41, so that the distance between the impeller 42 and the motor 33 can be adjusted.

The mounting frame 31 is provided with a first positioning portion 314, the fixing frame 41 is provided with a second positioning portion 414, and the first positioning portion 314 and the second positioning portion 414 are arranged oppositely. The first positioning portion 314 and the second positioning portion 414 move relatively under the driving of the moving mechanism 50. When the first positioning portion 314 and the second positioning portion 414 are nested with each other, the motor 33 is substantially coaxial with the impeller 42.

The phrase "the motor 33 and the impeller 42 are substantially coaxial" means that the central axis of the motor 33 is parallel to the central axis of the impeller 42, and the distance between the central axis of the motor 33 and the central axis of the impeller 42 is 0 to 1 mm; or the central axis of the motor 33 intersects with the central axis of the impeller 42, and the included angle between the central axis of the motor 33 and the central axis of the impeller 42 is 0-5 degrees.

When the testing device 100 is used for testing, the first positioning portion 314 and the second positioning portion 414 are nested with each other to make the motor 33 and the impeller 42 substantially coaxial; then, the distance between the impeller 42 and the motor 33 is adjusted through the adjusting bracket 45, so that the initial distance between the magnet of the impeller 42 and the stator of the motor 33 is 0; finally, the motor 33 may be gradually separated from the impeller 42 by the moving mechanism 50 or the adjusting bracket 45. During the separation process, the axial distance values of the stators of the motors 33 and the magnets of the impellers 42 and the rotating speed of the impellers 42 at the axial distance are recorded, and a relational graph is drawn according to the axial distance values, so that the axial distance values of the magnets of the impellers 42 and the stators of the motors 33 directly reflect the rotating speed of the impellers 42. Since the initial distance between the magnet of the impeller 42 and the stator of the motor 33 is 0, the integrity of the inspection data can be ensured. Moreover, since the motor 33 and the impeller 42 are substantially coaxial when the first positioning portion 314 and the second positioning portion 414 are nested with each other, the motor 33 and the impeller 42 can be ensured to be substantially coaxial at any time and the test accuracy can be ensured as long as the first positioning portion 314 and the second positioning portion 414 are not separated during the moving process, so that the corresponding relationship between the axial distance between the impeller magnet and the motor stator and the impeller rotation speed can be accurately obtained.

The structures of the base 20, the driving mechanism 30, the magnetic mechanism 40, and the moving mechanism 50 will be specifically described below.

Referring to fig. 6, the base 20 includes a bottom plate 21 and a supporting plate 22 connected to the bottom plate 21.

The bottom plate 21 has a substantially plate-like structure, and the bottom plate 21 has a first mounting surface 210, and the first mounting surface 210 is preferably an upper surface of the bottom plate 21. The first mounting surface 210 is a flat surface for mounting other components such as the moving mechanism 50, thereby fixing, supporting and supporting the components. The bottom surface of the bottom plate 21 is also a flat surface, so that the testing device 100 can be placed stably, and the testing device 100 is prevented from shaking during testing to influence the testing result.

The base plate 21 is provided with at least one coupling groove 211, and a fastener such as a bolt, a screw, or the like is inserted through the coupling groove 211 to fix the moving mechanism 50 to the first mounting surface 210 of the base plate 21. Specifically, the connecting groove 211 is a stepped hole structure penetrating through the bottom plate 21, and along the direction from the bottom surface of the bottom plate 21 to the upper surface thereof, the connecting groove 211 comprises a first stepped hole and a second stepped hole which are communicated, the aperture of the first stepped hole is larger than that of the second stepped hole, the head of a bolt or a screw is accommodated in the first stepped hole, the head of the bolt or the screw is prevented from protruding from the bottom surface of the bottom plate 21, and the stable placement of the testing device 100 is ensured.

The support plate 22 has a substantially plate-like configuration, and one end thereof is fixed to the first mounting surface 210 and the other end thereof extends toward a side away from the first mounting surface 210. The end surface of the support plate 22 opposite to the magnetic mechanism 40 is a second mounting surface 220, and the second mounting surface 220 is a flat surface which is substantially perpendicular to the first mounting surface 210. The second mounting surface 220 is provided with a mounting hole 221, the central axis of the mounting hole 221 is substantially perpendicular to the second mounting surface 220, and the drive mechanism 30 is detachably mounted in the mounting hole 221.

In a cross section parallel to the first mounting surface 210, the cross-sectional shape of the coupling groove 211 is a long bar, which extends substantially in a direction perpendicular to the second mounting surface 220. Therefore, when the moving mechanism 50 is fixed on the bottom plate 21, the axial distance between the moving mechanism 50 and the supporting plate 22 can be adjusted as required to perform coarse positioning on the first positioning portion 314 and the second positioning portion 414, and then the moving mechanism 50 performs precise positioning on the first positioning portion 314 and the second positioning portion 414, so that the precision of the test is improved through secondary positioning.

In the embodiment shown in fig. 6, the bottom plate 21 and the support plate 22 are both rectangular plate-shaped structures, and the bottom plate 21 and the support plate 22 are integrally formed. It will be appreciated that the present application is not limited to the specific shapes of the bottom plate 21 and the support plate 22. In other embodiments, the bottom plate 21 and the supporting plate 22 may have other shapes, such as a circular plate-shaped structure, as long as the first mounting surface 210 and the second mounting surface 220 are flat surfaces. It is also understood that in other embodiments, the bottom plate 21 and the supporting plate 22 may be fixedly connected by welding, bonding, or screwing, the moving mechanism 50 may be fixed on the first mounting surface 210 by welding, bonding, or other methods, and the driving mechanism 30 may be fixed on the second mounting surface 220 by welding, bonding, or other methods.

Referring to fig. 7, the driving mechanism 30 at least includes a mounting bracket 31, and a control member 32, a motor 33, a limiting member 34, a spacer 35 and a positioning bracket 36 respectively connected to the mounting bracket 31.

Referring to fig. 8 and 9, the mounting frame 31 at least includes a mounting portion 311, an accommodating portion 312, a connecting portion 313 and a first positioning portion 314.

The mounting portion 311 is generally plate-shaped, preferably circular plate-shaped, and the outer diameter of the mounting portion 311 is matched with the hole diameter of the mounting hole 221 of the supporting plate 22, so that the mounting portion 311 is just inserted into the mounting hole 221. An end surface of the mounting portion 311 facing the magnetic mechanism 40 is provided with a stopper groove 3111, and the control member 32 is fitted in the stopper groove 3111.

Specifically, the bottom surface of the limiting groove 3111 is a flat surface, and the control member 32 is attached to the bottom surface of the limiting groove 3111. As shown in fig. 7, the control member 32 is provided with a second connection hole 321 matching with the first connection hole 3112, and a fastener such as a bolt or a screw passes through the first connection hole 3112 and the second connection hole 321 to fix the control member 32 in the limiting groove 3111.

The tank bottom of spacing groove 3111 still is provided with holding tank 3113 for hold from spare parts such as the protruding electric capacity of the terminal surface (the terminal surface with spacing groove 3111 laminating) of control 32, resistance to make the better laminating of control 32 to the tank bottom surface of spacing groove 3111. The tank bottom of holding tank 3113 is provided with perforation 3114 to spare parts such as the pin of confession control piece 32, socket wear out, make better laminating of control piece 32 to spacing groove 3111's tank bottom surface.

The accommodating portion 312 has a substantially cylindrical structure with one end open and the other end closed, and an accommodating chamber is provided in the accommodating portion 312, and the stator 330 is accommodated in the accommodating chamber. The mounting portion 311 is provided with a through hole 3115, and the open end of the accommodating portion 312 is disposed around the hole edge of the through hole 3115.

As shown in fig. 7 and 8, the positioning frame 36 includes a cover 361 and positioning pillars 362, one end of each positioning pillar 362 is connected to the cover 361, and the other end extends away from the cover 361. The cover 361 is located outside the accommodating portion 312, a through hole 3121 is formed in a bottom wall of the accommodating portion 312, and the positioning column 362 penetrates through the through hole 3121 and extends into the accommodating cavity.

The bottom wall of the accommodating portion 312 is further provided with a mounting groove 3122, the cover plate 361 is provided with a mounting hole 363, and when the cover plate is assembled, a fastener such as a pin, a bolt and the like penetrates through the mounting hole 363 and the mounting groove 3122, so that the cover plate 361 and the accommodating portion 312 are fixedly connected.

Referring to fig. 10, the position-limiting member 34 is sleeved outside the positioning column 362, and the positioning column 362 can position the position-limiting member 34 and the stator 330 assembled on the position-limiting member 34, so as to prevent the stator 330 from moving freely in the accommodating portion 312. Preferably, the through hole 3121 is located at the center of the bottom wall of the accommodating portion 312, and the central axis of the positioning column 362 extends substantially in the direction perpendicular to the second mounting surface 220, so that the central axis of the stator 330 also extends substantially in the direction perpendicular to the second mounting surface 220. It should be understood that the present application is not limited to the specific structure of the positioning frame 36, as long as it can radially limit the position of the stator 330, for example, in other embodiments, the positioning frame 36 may only include a positioning column, one end of the positioning column is fixed on the bottom wall of the accommodating portion 312, the other end of the positioning column extends toward one side of the through hole 3115, and the limiting member 34 is sleeved outside the positioning column.

Referring to fig. 5 again, the limiting member 34 is provided with a plurality of limiting engaging grooves 341 on the periphery thereof, the plurality of limiting engaging grooves 341 are arranged around the central axis of the limiting member 34, and the number of the limiting engaging grooves 341 is the same as that of the posts 331. Each of the stopper catching grooves 341 extends substantially in a direction parallel to the central axis of the stator 330, and each of the posts 331 is received in the corresponding stopper catching groove 341. Because the limiting clamping groove 341 is a structure preset on the limiting member 34, the assembly precision of the limiting clamping groove 341 is high. This application makes a plurality of posts 331 encircle locating part 34 and arranges to with each post 331 spacing in the spacing draw-in groove 341 that corresponds, can avoid post 331 to incline, make post 331 be on a parallel with stator 330's the central axis all the time, improve the accuracy of detected data.

The end of the limiting member 34 away from the impeller 42 is provided with a mounting groove 342, and the positioning column 362 is inserted into the mounting groove 342. In the present embodiment, the mounting groove 342 is a through hole structure, and it axially penetrates through two ends of the limiting member 34.

Referring to fig. 11, the spacer 35 is substantially cylindrical, and the spacer 35 is disposed outside the stator 330. The outer wall of the partition 35 is provided with a stopper protrusion 351. As shown in fig. 7 and 9, a guide groove 3123 extending to the mounting portion 311 is formed on a side wall of the receiving portion 312, and the guide groove 3123 communicates with the through hole 3115. The limiting protrusion 351 is clamped in the guiding groove 3123, and the limiting protrusion 351 is matched with the guiding groove 3123, so that the isolating piece 35 is prevented from moving freely in the accommodating portion 312.

As shown in fig. 7 and 11, a first window 3124 connected to the accommodating chamber is formed on a side wall of the accommodating portion 312, and the first window 3124 extends to a bottom wall of the accommodating chamber. The partition 35 is provided with an escape groove 352 at a position opposite to the first window 3124. Through the first window 3124 and the bypass groove 352, glue can be poured between the stator 330 and the accommodating portion 312, so that the stator 330 is fixed in the accommodating cavity, and an operator can conveniently monitor the state of the stator 330 at any time. One end of the partition 35 facing the impeller 42 is provided with a U-shaped notch 353, and glue can be poured between the stator 330 and the accommodating portion 312 through the notch 353, so that the stator 330 is fixed in the accommodating cavity, and an operator can conveniently monitor the state of the stator 330 at any time.

In this embodiment, the limiting member 34 and the spacer 35 are made of paraffin, and since the melting point of paraffin is low, after the test is completed, the limiting member 34 and the spacer 35 are dissolved or melted, so as to realize demolding, and the subsequent assembly process of the stator 330 is not affected, for example, a housing is installed outside the stator 330. That is, the limiting member 34 and the spacer 35 do not occupy the internal space of the motor 33 in the subsequent assembly process, and the size of the motor 33 is not increased.

Referring to fig. 4 again, the stator 330 at least includes a plurality of posts 331, a coil winding 332 surrounding the outer periphery of each post 331, and a back plate 333. Wherein a plurality of posts 331 are arranged around their centerlines, enclosing a quasi-annular structure. The column 331 serves as a magnetic core, which is made of a soft magnetic material, such as cobalt steel or the like. Each post 331 includes a rod portion 3311 and a pole piece 3312 secured to one end of the rod portion 3311. The back plate 333 is connected to the end of the rod 3311 remote from the pole pieces 3312 to close the magnetic return path. The back plate 333 is also made of soft magnetic material, such as cobalt steel, etc., the back plate 333 is provided with a positioning hole 3331, and the back plate 333 is sleeved outside the positioning post 362 through the positioning hole 3331. The coil winding 332 includes a plurality of coils, each of which is wound outside the corresponding post 331, and the plurality of coils are sequentially controlled by the control member 32 to create a rotating magnetic field for driving the impeller.

Referring to fig. 7, 8 and 9 again, the connection portion 313 is substantially a plate-shaped structure, and is disposed around the side edge of the mounting portion 311, and the connection portion 313 is preferably a circular ring structure. The connection portion 313 is connected to the support plate 22 so that the mounting bracket 31 is fixed to the support plate 22.

Specifically, the end surface of the connection portion 313 facing the support plate 22 is a third mounting surface 3130, and the third mounting surface 3130 is a flat surface, which is substantially parallel to the second mounting surface 220 of the support plate 22. The connection portion 313 is provided with a third connection hole 3131, and the third connection hole 3131 is engaged with a fastening member such as a bolt to fix the connection portion 313 to the support plate 22.

Since the second mounting surface 220 and the third mounting surface 3130 are flat surfaces and the third mounting surface 3130 is substantially parallel to the second mounting surface 220, when the third mounting surface 3130 is attached to the second mounting surface 220, the motor 33 mounted in the accommodating portion 312 can be better positioned, and the accuracy in testing can be ensured.

The first positioning portion 314 has a substantially cylindrical structure, preferably a cylindrical structure. One end of the first positioning portion 314 is fixed to the connection portion 313, and the other end extends toward the magnetic mechanism 40. Preferably, the first positioning portion 314 extends substantially in a direction perpendicular to the third mounting surface 3130.

Specifically, the first positioning portion 314 is disposed around the accommodating portion 312, and a center line of the first positioning portion 314 substantially coincides with a center line of the accommodating portion 312, so that the first positioning portion 314 is substantially coaxial with the stator 330 fitted in the accommodating portion 312.

Referring to fig. 12, the magnetic structure 40 at least includes a fixing frame 41, an impeller 42, a bearing 43, a rotating shaft 44 and an adjusting frame 45. The impeller 42 is rotatably assembled on an adjusting bracket 45 through a bearing 43 and a rotating shaft 44, and the adjusting bracket 45 is movably connected to the fixed bracket 41, so that the distance between the impeller 42 and the motor 33 is adjustable.

The fixing frame 41 at least includes a first fixing portion 411, a second fixing portion 412, a supporting portion 413 and a second positioning portion 414.

The first fixing portion 411 is substantially a plate-like structure, and is fitted to the moving mechanism 50. The first fixing portion 411 may be fixedly connected to the moving mechanism 50 by a screw connection or the like.

The second fixing portion 412 is substantially a plate-shaped structure, and one end of the second fixing portion is fixed to the first fixing portion 411, and the other end extends to a side away from the first fixing portion 411. The end surface of the second fixing portion 412 opposite to the driving mechanism 30 is a fourth mounting surface 4120, the fourth mounting surface 4120 is a flat surface, and the fourth mounting surface 4120 is substantially perpendicular to the first mounting surface 210 of the base 20.

The support portion 413 has a substantially columnar structure, one end of which is fixed to the fourth mounting surface 4120 and the other end of which extends toward the drive mechanism 30. The adjusting frame 45 is movably connected to the supporting portion 413, and a positioning structure is arranged between the adjusting frame 45 and the supporting portion 413, and the positioning structure enables the adjusting frame 45 to be fixedly connected with the supporting portion 413.

In the embodiment shown in fig. 12 and 13, the end of the adjusting bracket 45 facing away from the driving mechanism 30 is provided with a positioning slot 451, and the supporting portion 413 is nested in the positioning slot 451. The side wall of the adjusting bracket 45 is provided with a limiting hole 452, and the limiting hole 452 is communicated with the positioning groove 451. The positioning structure includes the limiting hole 452, and a connecting member (not shown) detachably connected in the limiting hole 452, wherein the connecting member may be a fastening member such as a pin, a bolt, etc. During assembly, the connecting member passes through the limiting hole 452 until abutting against the side wall of the supporting portion 413, so that the adjusting frame 45 is fixedly connected with the supporting portion 413.

The end of the adjusting bracket 45 facing the driving mechanism 30 is provided with a fixing groove 453, the fixing groove 453 has a stepped structure including a first fixing groove 453a and a second fixing groove 453b which are communicated with each other, the inner diameter of the first fixing groove 453a is larger than that of the second fixing groove 453b, the bearing 43 is fixed in the first fixing groove 453a, and the rotation shaft 44 passes through the bearing 43 and extends into the second fixing groove 453 b. A fixing hole 454 is provided at a sidewall of the first fixing groove 453a, and the fixing hole 454 communicates with the first fixing groove 453 a. During assembly, a fastener such as a pin or a bolt is inserted through the fixing hole 454 until the fastener abuts against the bearing 43, so that the bearing 43 is fixed in the fixing groove 453; then, the rotating shaft 44 is fixed to the bearing 43, and the impeller 42 is fixed to the rotating shaft 44, so that the impeller 42 is rotatably fitted to the adjustment bracket 45. The impeller 42 includes a housing 421, and a magnet 422 mounted on the housing 421. The magnet 422 interacts with the rotating magnetic field generated by the stator 330 to cause the impeller 42 to rotate.

It will be appreciated that the present embodiment is not limited to the specific connection manner of the adjusting bracket 45 and the supporting portion 413 and the specific structure of the positioning structure, for example, in other embodiments, the end of the supporting portion 413 facing the driving mechanism 30 is provided with a positioning slot, and the adjusting bracket 45 is nested in the positioning slot. The lateral wall of supporting part 413 is provided with spacing hole, and spacing hole is linked together with the constant head tank. The positioning structure comprises the limiting hole and a connecting piece detachably connected in the limiting hole, and the connecting piece can also be a fastening piece such as a pin, a bolt and the like. During assembly, the connecting piece penetrates through the limiting hole until the connecting piece is abutted to the side wall of the adjusting frame 45, so that the adjusting frame 45 is fixedly connected with the supporting part 413.

The second positioning portion 414 has a substantially cylindrical structure, preferably a cylindrical structure. One end of the second positioning portion 414 is fixed to the fourth mounting surface 4120, and the other end extends toward the side of the drive mechanism 30. Preferably, the second positioning portion 414 extends substantially in a direction perpendicular to the fourth mounting surface 4120.

Specifically, the second positioning portion 414 is disposed around the support portion 413, and a center line of the second positioning portion 414 substantially coincides with a center line of the support portion 413, so that the second positioning portion 414 is substantially coaxial with the impeller 42 fitted on the support portion 413.

The second positioning portion 414 is configured to cooperate with the first positioning portion 314, an end of the second positioning portion 414 facing the driving mechanism 30 is provided with an insertion portion 4141, and a shape and a size of the insertion portion 4141 are adapted to a shape and a size of an inner cavity of the first positioning portion 314, so that when the insertion portion 4141 is inserted into the first positioning portion 314, the first positioning portion 314 and the second positioning portion 414 are substantially coaxial. Since the first positioning portion 314 is substantially coaxial with the motor 33 and the second positioning portion 414 is substantially coaxial with the impeller 42, when the second positioning portion 414 and the first positioning portion 314 are nested with each other, it is ensured that the motor 33 is substantially coaxial with the impeller 42.

The second positioning portion 414 is further provided with a second window 4142, so that the operator can move the adjusting bracket 45 through the second window 4142 and fix the adjusting bracket 45 on the supporting portion 413, and the operator can conveniently observe the state of the impeller 424 at any time through the second window 4142.

It is understood that the present embodiment does not limit the specific connection manner between the first positioning portion 314 and the second positioning portion 414, and in other embodiments, the first positioning portion 314 may be inserted into the second positioning portion 414.

It is also understood that the present embodiment does not limit the specific structure and position of the second positioning portion 414 and the first positioning portion 314, as long as the second positioning portion 414 is matched with the shape and size of the first positioning portion 314 to ensure that the motor 33 and the impeller 42 are substantially coaxial when the second positioning portion 414 and the first positioning portion 314 are nested with each other. For example, in other embodiments, the central axis of the second positioning portion 414 is disposed in parallel with and spaced from the central axis of the impeller 42, and the central axis of the first positioning portion 314 is disposed in parallel with and spaced from the central axis of the motor 33, but when the second positioning portion 414 and the first positioning portion 314 are nested with each other, the motor 33 is substantially coaxial with the impeller 42.

The testing device 100 further includes a distance measuring member (not shown) that can be mounted on the base 20. The distance measuring device is used for measuring the axial distance between the column 331 of the stator 330 and the magnet 422 of the impeller 42, and the distance measuring device can be a graduated scale, preferably a grating scale. The grating ruler, also called as grating ruler displacement sensor, uses the optical principle of grating, can be used for detecting linear displacement or angular displacement, the signal output by the grating ruler is digital pulse, and has the characteristics of large detection range, high detection precision and fast response speed.

In this embodiment, the driving mechanism 30 is fixed on the supporting plate 22 of the base 20, and the magnetic structure 40 is fixed on the moving mechanism 50. It is understood that in other embodiments, the magnetic mechanism 40 can be fixed on the supporting plate 22 of the base 20 and the driving mechanism 30 can be fixed on the moving mechanism 50, as long as the relative positions of the magnetic mechanism 40 and the driving mechanism 30 can be adjusted.

It is understood that the present invention is not limited to the above embodiments, and various modifications and changes can be made without departing from the spirit and scope of the present invention.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

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