CN112891731B

CN112891731B - Test device

Info

Publication number: CN112891731B
Application number: CN202110093600.7A
Authority: CN
Inventors: 谢端卿; 余顺周
Original assignee: Shenzhen Core Medical Technology Co Ltd
Current assignee: Shenzhen Core Medical Technology Co Ltd
Priority date: 2021-01-22
Filing date: 2021-01-22
Publication date: 2023-07-14
Anticipated expiration: 2041-01-22
Also published as: CN112891731A

Abstract

The invention provides a testing device, which comprises a base, a driving mechanism and a magnetic force mechanism, wherein the driving mechanism and the magnetic force mechanism are respectively connected to the base; the magnetic force mechanism comprises a fixed frame and an impeller rotatably connected to the fixed frame, and a magnet is arranged on the impeller; the driving mechanism comprises a mounting frame, and a control piece, a motor, a spacer and a limiting piece which are respectively connected to the mounting frame; the motor comprises a stator, the stator comprises a plurality of columns which encircle the limiting piece and coil windings which surround the periphery of each column, a plurality of limiting clamping grooves are formed in the periphery of the limiting piece, each column is contained in the corresponding limiting clamping groove, the mounting frame comprises a containing portion, the containing portion is provided with a containing cavity, the stator is assembled in the containing cavity, and the isolating piece is located between the stator and the containing cavity. The testing device provided by the invention can accurately obtain the corresponding relation between the axial distance between the impeller magnet and the motor stator and the impeller rotating speed.

Description

Test device

Technical Field

The invention relates to the field of medical equipment, 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

An intravascular blood pump, designed for percutaneous insertion into a patient's blood vessel, such as an artery or vein of the thigh or armpit, may be advanced into the patient's heart to function as a left ventricular assist device or a right ventricular assist device. Thus, an intravascular blood pump may also be referred to as an intracardiac blood pump.

The 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 transported from the blood inlet to the blood outlet of the blood pump. The rotation speed of the impeller is related to the axial distance between the magnet and the stator, and when the axial distance between the magnet and the stator is 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 rotation speed of the impeller is also increased. Because the motor is a static part and does not rotate along with the impeller, a certain gap is reserved between the impeller and the motor when a specific structure of the blood pump is designed, so that the motor is prevented from being touched when the impeller rotates; and, if the gap reserved is too small, blood flow stagnates in the gap, causing blood coagulation and thrombosis. Therefore, it is desirable to rationally design the axial spacing between the impeller magnets and the motor stator to provide proper rotational speed for the impeller without affecting the blood flow in the gap between the motor and the impeller.

Therefore, when designing the specific structure of the blood pump, it is important to detect the corresponding relation between the axial distance between the impeller magnet and the motor stator and the impeller rotating speed in advance, if the corresponding relation between the impeller magnet and the motor stator is known in advance, the magnitude of the axial distance between the impeller magnet and the motor stator directly reflects the impeller rotating speed, so that the specific structure of the blood pump can be conveniently designed. Therefore, how to accurately obtain the correspondence between the axial distance between the impeller magnet and the motor stator and the impeller rotation speed is a problem that must be overcome.

Disclosure of Invention

In view of at least one of the above-mentioned drawbacks, it is necessary to provide a testing device that can accurately obtain the correspondence between the axial distance between the impeller magnet and the motor stator and the impeller rotational speed.

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

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

the driving mechanism comprises a mounting frame, and a control piece, a motor, a spacer and a limiting piece which are respectively connected to the mounting frame; the motor comprises a stator, wherein the stator comprises a plurality of posts arranged around the limiting piece and coil windings around the periphery of each post, the coil windings are electrically connected with the control piece, and generate a rotating magnetic field interacted with the magnet to enable the impeller to rotate;

the periphery of locating part is provided with a plurality of spacing draw-in grooves, every the post is acceptd in corresponding spacing draw-in groove, the mounting bracket includes accommodation portion, accommodation portion has the chamber of holding, the stator assembly is in hold the intracavity, the separator is located the stator with hold between the chamber.

In an embodiment, the mounting frame further comprises a mounting part and a connecting part which are connected, the connecting part is used for being connected with the base, the control piece and the accommodating part are respectively connected to the mounting part, and a through hole communicated with the accommodating cavity is formed in the mounting part;

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 of the accommodating cavity opposite to the through hole, the other end of the positioning column extends towards one side of the through hole, and the limiting piece is sleeved outside the positioning column.

In an embodiment, the positioning frame further comprises a cover plate, the positioning column is fixed on the cover plate and extends towards a direction away from the cover plate, the cover plate is located on the outer side of 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 an embodiment, the spacer is in 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.

In an embodiment, a window communicated to the accommodating cavity is arranged on the side wall of the accommodating part, the window extends to the bottom wall, and an avoidance groove is arranged on the isolating piece at a position opposite to the window.

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

the mounting frame further comprises a first positioning part connected to the mounting part, the mounting frame comprises a second positioning part, the second positioning part is arranged opposite to the first positioning part, the first positioning part and the second positioning part move relatively under the drive of the moving mechanism, and when the first positioning part and the second positioning part are mutually nested, the motor and the impeller are basically coaxial.

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 an embodiment, the fixing frame further comprises:

a first fixing part for connecting with the moving mechanism;

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

and the supporting part is arranged on the second fixing part and extends towards one side of the motor, and the impeller is rotatably connected to the supporting part.

In an 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;

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.

In an embodiment, the spacer and the limiting member are paraffin components.

The testing device provided by the invention has the following beneficial effects: the testing device is used for simulating the working states of the impeller of the blood pump and the motor stator, and the plurality of columns are arranged around the limiting piece and are limited in the limiting clamping groove of the limiting piece, so that the inclination of the columns can be avoided, the columns are always parallel to the central axis of the stator, the stator can generate a stable rotating magnetic field, the impeller can be ensured to stably operate during testing, and the accuracy of detection data is improved; and, this application sets up the spacer between stator and holding the chamber, and protection coil is not damaged in the assembly process, can further ensure the impeller steady operation when testing, improves the accuracy of detection data to the axial distance of impeller magnet and motor stator and impeller rotational speed's correspondence is accurately obtained.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort to a person of ordinary skill in the art.

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

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

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

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

FIG. 5 is a schematic view of a limiting member of a driving mechanism of the testing device shown in FIG. 3;

FIG. 6 is a schematic view of the structure of the base of the test device shown in FIG. 3;

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

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

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

FIG. 10 is an enlarged view of portion A of the test apparatus shown in 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 testing device of FIG. 3;

FIG. 13 is a cross-sectional view of the adjustment bracket of the magnetic force mechanism of FIG. 12.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When a component is considered to be "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 herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein 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 device 100 for simulating the working 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 rotation speed of the impeller.

Referring to fig. 3, the testing device 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 force mechanism 40 is installed on the moving mechanism 50, and the relative position of the driving mechanism 30 and the magnetic force mechanism 40 can be adjusted by the moving mechanism 50.

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

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

Referring to fig. 4, the motor 33 includes a stator 330, and the stator 330 includes at least a plurality of posts 331 disposed around the stopper 34, and a coil winding 332 surrounding an outer circumference of each of the posts 331. The coil winding 332 is electrically connected to the control member 32, and the coil winding 332 generates a rotating magnetic field that interacts with the magnet to rotate the impeller. Specifically, the coil winding 332 includes a plurality of coils, each wound outside a corresponding post 331, which are sequentially controlled by the control member 32 to create a rotating magnetic field for driving the impeller 42.

Referring to fig. 5, a plurality of limiting slots 341 are disposed on the outer periphery of the limiting member 34, and each of the columns 331 is received in a corresponding limiting slot 341. Referring again to fig. 3, the mounting frame 31 includes a receiving portion 312, and the receiving portion 312 has a receiving cavity therein, in which the stator 330 is fitted, and the spacer 35 is located between the stator 330 and the receiving cavity.

During the test, if the column 331 of the stator 330 is inclined relative to the central axis of the stator 330, the rotating magnetic field is unstable, resulting in problems of slow rotation speed, uneven rotation speed, high noise, etc. of the impeller 42. This application makes a plurality of posts 331 encircle locating part 34 and arranges to with every post 331 spacing in the spacing draw-in groove 341 that corresponds, can avoid post 331 slope, make post 331 be on a parallel with the central axis of stator 330 all the time, thereby improves the accuracy of detection data, accurately obtains the axial distance of impeller magnet and motor stator and impeller rotational speed's corresponding relation.

During assembly, when the stator 330 is placed in the accommodating cavity of the accommodating portion 312, the inner wall of the accommodating cavity is easily scratched by the coil, resulting in unstable rotating magnetic field, which affects the operation of the impeller 42. The spacer 35 is arranged between the stator 330 and the accommodating cavity, so that the coil can be protected from being damaged in the assembly process, and the accuracy of detection data is improved.

Referring to fig. 3, the magnetic structure 40 further includes an adjusting frame 45, the adjusting frame 45 is disposed opposite to the mounting frame 31, and the impeller 42 is rotatably mounted on the adjusting frame 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 mounting frame 41 is provided with a second positioning portion 414, and the first positioning portion 314 and the second positioning portion 414 are arranged opposite to each other. The first positioning portion 314 and the second positioning portion 414 are driven by the moving mechanism 50 to move relatively. 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.

Here, "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 1mm; alternatively, the central axis of the motor 33 intersects with the central axis of the impeller 42, and the angle between the central axis of the motor 33 and the central axis of the impeller 42 is 0 to 5 °.

In the test using the test apparatus 100, first, the first positioning portion 314 and the second positioning portion 414 are nested with each other so that the motor 33 and the impeller 42 are substantially coaxial; then, the distance between the impeller 42 and the motor 33 is adjusted by the adjusting frame 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 frame 45. In the separation process, the axial distance value between the stator of the motor 33 and the magnet of the impeller 42 and the rotation speed of the impeller 42 at the axial distance are recorded, and a relation graph is drawn according to the axial distance value, so that the magnitude of the axial distance between the magnet of the impeller 42 and the stator of the motor 33 directly reflects the rotation speed of the impeller 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 detection data can be ensured. In addition, when the first positioning portion 314 and the second positioning portion 414 are nested with each other, the motor 33 and the impeller 42 are basically coaxial, so that in the moving process, as long as the first positioning portion 314 and the second positioning portion 414 are not separated, the motor 33 and the impeller 42 can be basically coaxial at all times, the testing accuracy is ensured, and the corresponding relation between the axial distance between the impeller magnet and the motor stator and the impeller rotating speed is 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 support plate 22 coupled 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 movement mechanism 50 to thereby secure, cradle and support 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 influence of the shaking of the testing device 100 on the detection result during the testing is avoided.

At least one connecting groove 211 is provided in the base plate 21, and a fastener such as a bolt, a screw, or the like passes through the connecting 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, along the direction from the bottom surface of the bottom plate 21 to the upper surface of the bottom plate, 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 bolt head of the bolt or the bolt is accommodated in the first stepped hole, the bolt head of the bolt or the bolt is prevented from protruding from the bottom surface of the bottom plate 21, and the test device 100 is ensured to be stably placed.

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

In a cross section parallel to the first mounting surface 210, the connecting groove 211 has a long bar shape in cross section, 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 roughly position the first positioning portion 314 and the second positioning portion 414, and then the moving mechanism 50 is used to precisely position the first positioning portion 314 and the second positioning portion 414, so that the accuracy of the test is improved through the secondary positioning.

In the embodiment shown in fig. 6, the bottom plate 21 and the support plate 22 are rectangular plate structures, and the bottom plate 21 and the support plate 22 are integrally formed. It is understood that the specific shapes of the bottom plate 21 and the support plate 22 are not limited in this application. In other embodiments, the bottom plate 21 and the supporting plate 22 may have other shapes, such as a circular plate structure, so long as the first mounting surface 210 and the second mounting surface 220 are ensured to be flat surfaces. It will also be appreciated that in other embodiments, the base plate 21 and the support plate 22 may be fixedly coupled by welding, bonding, or threading, and the movement mechanism 50 may be fixed to the first mounting surface 210 by welding, bonding, or other means, and the drive mechanism 30 may be fixed to the second mounting surface 220 by welding, bonding, or other means.

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

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

The mounting portion 311 has a substantially plate-like structure, preferably a circular plate structure, and the outer diameter of the mounting portion 311 is sized to fit the aperture of the mounting hole 221 of the support plate 22 so that the mounting portion 311 fits into the mounting hole 221. The end surface of the mounting portion 311 facing the magnetic mechanism 40 is provided with a limiting groove 3111, and the control member 32 is fitted into the limiting 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. The groove bottom of the limiting groove 3111 is provided with a first connecting hole 3112, and as shown in fig. 7, the control member 32 is provided with a second connecting hole 321 matching with the first connecting hole 3112, and a fastener such as a bolt or a screw passes through the first connecting hole 3112 and the second connecting hole 321 to fix the control member 32 in the limiting groove 3111.

The groove bottom of the limit groove 3111 is further provided with a receiving groove 3113 for receiving parts such as a capacitor and a resistor protruding from an end face of the control piece 32 (an end face attached to the limit groove 3111), thereby enabling the control piece 32 to be attached to the groove bottom surface of the limit groove 3111 better. The bottom of the accommodating groove 3113 is provided with a through hole 3114 for allowing the pins, sockets, and other parts of the control member 32 to pass out, so that the control member 32 is better attached to the bottom surface of the limiting groove 3111.

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 an opening end of the receiving portion 312 is provided around a hole edge of the through hole 3115.

As shown in fig. 7 and 8, the positioning frame 36 includes a cover plate 361 and a positioning column 362, one end of the positioning column 362 is connected to the cover plate 361, and the other end extends in a direction away from the cover plate 361. The cover plate 361 is located outside the accommodating portion 312, a through hole 3121 is provided in a bottom wall of the accommodating portion 312, and the positioning post 362 is inserted through the through hole 3121 and extends into the accommodating chamber.

The bottom wall of the accommodating portion 312 is further provided with an assembling groove 3122, and the cover plate 361 is provided with an assembling hole 363, and when assembling, a fastener such as a pin or a bolt is inserted into the assembling hole 363 and the assembling groove 3122 to fixedly connect the cover plate 361 and the accommodating portion 312.

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

Referring to fig. 5 again, a plurality of limiting slots 341 are disposed on the outer periphery of the limiting member 34, the plurality of limiting slots 341 are disposed around the central axis of the limiting member 34, and the number of limiting slots 341 is the same as the number of columns 331. Each of the limiting 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 limiting groove 341. Since the limit clamping groove 341 is a structure preset on the limit piece 34, the assembly accuracy of the limit clamping groove 341 is high. This application makes a plurality of posts 331 encircle locating part 34 and arranges to with every post 331 spacing in the spacing draw-in groove 341 that corresponds, can avoid post 331 slope, make post 331 be on a parallel with the central axis of stator 330 all the time, improve the accuracy of detecting data.

The end of the limiting member 34 away from the impeller 42 is provided with a mounting groove 342, and the positioning post 362 is embedded into the mounting groove 342. In this embodiment, the mounting groove 342 is a through hole structure, which penetrates through two ends of the limiting member 34 along the axial direction.

Referring to fig. 11, the spacer 35 has a substantially cylindrical structure, and the spacer 35 is sleeved outside the stator 330. The outer wall of the spacer 35 is provided with a limit projection 351. As shown in fig. 7 and 9, a guide groove 3123 extending to the mounting portion 311 is provided 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 to prevent the spacer 35 from moving randomly in the accommodating portion 312.

As shown in fig. 7 and 11, the side wall of the accommodating portion 312 is provided with a first window 3124 communicating to the accommodating chamber, and the first window 3124 extends to the bottom wall of the accommodating chamber. The spacer 35 is provided with a relief groove 352 at a position opposite to the first window 3124. Through the first window 3124 and the avoiding 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 monitor the state of the stator 330 at any time conveniently. The end of the spacer 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 monitor the state of the stator 330 at any time conveniently.

In this embodiment, the limiting member 34 and the isolating member 35 are paraffin components, and the melting point of paraffin is low, so that after the test is completed, the limiting member 34 and the isolating member 35 are dissolved or melted, thereby realizing demolding, and the subsequent assembly process of the stator 330, such as mounting a housing outside the stator 330, is not affected. That is, the stopper 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 again to fig. 4, 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 the plurality of posts 331 are arranged around their central line, enclosing a ring-like structure. The post 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. Backing plate 333 is connected to an end of rod 3311 remote from pole piece 3312 to close the magnetic return path. The back plate 333 is also made of soft magnetic material, such as cobalt steel, and the back plate 333 is provided with a positioning hole 3331, and the back plate 333 is sleeved outside the positioning column 362 through the positioning hole 3331. The coil winding 332 includes a plurality of coils, each wound outside a corresponding post 331, which are sequentially controlled by the control member 32 to create a rotating magnetic field for driving the impeller.

Referring again to fig. 7, 8 and 9, the connection portion 313 has a substantially plate-like structure, which is disposed around a 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, and fixes the mount 31 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 that 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 fastener 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 both 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 assembled in the accommodating portion 312 can be better positioned, and 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 connecting portion 313, and the other end extends toward one side of 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 is substantially coincident with a center line of the accommodating portion 312 such 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 mounted on an adjusting frame 45 through a bearing 43 and a rotating shaft 44, and 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 fixing frame 41 includes at least 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 has a substantially 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 threaded connection or the like.

The second fixing portion 412 has a substantially plate-like structure, one end of which is fixed to the first fixing portion 411, and the other end of which extends toward 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 one side of the driving mechanism 30. The adjusting frame 45 is movably connected to the supporting portion 413, and a positioning structure is disposed between the adjusting frame 45 and the supporting portion 413, and the adjusting frame 45 is fixedly connected to the supporting portion 413 by the positioning structure.

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 groove 451, and the supporting portion 413 is nested in the positioning groove 451. The lateral wall of the adjusting frame 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, where the connecting member may be a fastener such as a pin, a bolt, or the like. During assembly, the connecting piece 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 is of a stepped structure and comprises a first fixing groove 453a and a second fixing groove 453b which are communicated, 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 rotating shaft 44 passes through the bearing 43 and extends into the second fixing groove 453 b. The side wall of the first fixing groove 453a is provided with a fixing hole 454, and the fixing hole 454 communicates with the first fixing groove 453 a. During assembly, a fastener such as a pin or a bolt passes through the fixing hole 454 until abutting against the bearing 43 to fix the bearing 43 in the fixing groove 453; then, the rotation shaft 44 is fixed to the bearing 43, and the impeller 42 is fixed to the rotation shaft 44 so that the impeller 42 is rotatably fitted to the adjustment frame 45. Wherein the impeller 42 comprises 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 rotate the impeller 42.

It should be understood that the specific connection manner of the adjusting bracket 45 and the supporting portion 413 and the specific structure of the positioning structure are not limited in this embodiment, for example, in other embodiments, one 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 side wall of the supporting part 413 is provided with a limiting hole which is communicated with the positioning groove. 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 fastener such as a pin, a bolt and the like. During assembly, the connecting piece passes through the limiting hole until abutting against 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 one side of the driving 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 mounted 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 a plugging portion 4141, and a shape and a size of the plugging portion 4141 are adapted to those of the inner cavity of the first positioning portion 314, so that when the plugging 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, the motor 33 can be ensured to be substantially coaxial with the impeller 42 when the second positioning portion 414 is nested with the first positioning portion 314.

The second positioning portion 414 is further provided with a second window 4142, so that an operator can move the adjusting frame 45 through the second window 4142 and fix the adjusting frame 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 should be understood that the specific connection manner of the first positioning portion 314 and the second positioning portion 414 is not limited in this embodiment, and in other embodiments, the first positioning portion 314 may be inserted into the second positioning portion 414.

It should be further understood that the specific structure and positions of the second positioning portion 414 and the first positioning portion 314 are not limited in this embodiment, as long as the shape and size of the second positioning portion 414 and the first positioning portion 314 are adapted, so as 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 spaced parallel to the central axis of the impeller 42 and the central axis of the first positioning portion 314 is spaced parallel to the central axis of the motor 33, but when the second positioning portion 414 is nested with the first positioning portion 314, the motor 33 is substantially coaxial with the impeller 42.

The test device 100 also includes a ranging member (not shown) that may be mounted on the base 20. The distance measuring member 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 member may be a scale, preferably a grating scale. The grating ruler, also called as grating ruler displacement sensor, can be used for detecting linear displacement or angular displacement by utilizing the optical principle of the grating, and the signal output by the grating ruler in measurement is digital pulse, and has the characteristics of large detection range, high detection precision and high response speed.

In this embodiment, the driving mechanism 30 is fixed on the support plate 22 of the base 20, and the magnetic structure 40 is fixed on the moving mechanism 50. It will be appreciated that in other embodiments, the magnetic mechanism 40 may be fixed to the support plate 22 of the base 20, and the driving mechanism 30 may be fixed to the moving mechanism 50, so long as the relative positions of the magnetic mechanism 40 and the driving mechanism 30 are adjustable.

In the test using the test apparatus 100, first, the first positioning portion 314 and the second positioning portion 414 are nested with each other so that the motor 33 and the impeller 42 are substantially coaxial; then, the initial distance between the magnet of the impeller 42 and the stator of the motor 33 is set to 0 by the adjusting bracket 45; finally, the motor 33 may be gradually separated from the impeller 42 by the moving mechanism 50 or the adjusting frame 45. In the separation process, the distance measuring pieces are used for recording the axial distance value between the columns 331 of the plurality of groups of stators 330 and the magnets 422 of the impeller 42 and the impeller rotating speed at the axial distance, and the relationship graph is drawn according to the distance value, so that the axial distance value between the magnets 422 of the impeller 42 and the stators 330 of the motor 33 directly reflects the rotating speed of the impeller 42.

It is understood that the new technical solutions formed by freely combining the technical solutions in the embodiments without departing from the purpose of the present invention are also the scope of the present invention.

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

The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.

Claims

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

the driving mechanism comprises a mounting frame, and a control piece, a motor, a spacer and a limiting piece which are respectively connected to the mounting frame; the motor comprises a stator, wherein the stator comprises a plurality of posts arranged around the limiting piece and coil windings around the periphery of each post, the coil windings are electrically connected with the control piece, and generate a rotating magnetic field interacted with the magnet to enable the impeller to rotate; the periphery of locating part is provided with a plurality of spacing draw-in grooves, every spacing draw-in groove is roughly along being parallel to the central axis direction of stator extends, every the post is acceptd in corresponding spacing draw-in groove, the mounting bracket includes accommodation portion, accommodation portion has the accommodation chamber, the stator assembly is in accommodation intracavity, the separator is located the stator with hold between the chamber.

2. The test device of claim 1, wherein the mounting rack 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 of the accommodating cavity opposite to the through hole, the other end of the positioning column extends towards one side of the through hole, and the limiting piece is sleeved outside the positioning column.

3. The testing device according to claim 2, wherein the positioning frame further comprises 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 on the outer side of 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.

4. The testing device according to claim 2, wherein the spacer is of 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 test device according to claim 4, wherein a window communicating with the accommodation chamber is provided on a side wall of the accommodation portion, the window extends to the bottom wall, and a relief groove is provided on the spacer at a position opposite to the window.

6. The test 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 frame further comprises a first positioning part connected to the mounting part, the mounting frame comprises a second positioning part, the second positioning part is arranged opposite to the first positioning part, the first positioning part and the second positioning part move relatively under the drive of the moving mechanism, and when the first positioning part and the second positioning part are mutually nested, the motor and the impeller are basically coaxial.

7. The test device of claim 6, wherein the base comprises a base plate and a support plate connected to each other, the movement mechanism is connected to the base plate, the mount is connected to the movement mechanism, and the mount is connected to the support plate.

8. The test device of claim 6, wherein the mount further comprises: a first fixing part for connecting with the moving mechanism; a second fixing portion connected to the first fixing portion, the second positioning portion being provided on the second fixing portion; and the supporting part is arranged on the second fixing part and extends towards one side of the motor, and the impeller is rotatably connected to the supporting part.

9. The test device of claim 8, wherein the magnetic mechanism further comprises an adjustment frame, the impeller rotatably coupled to the adjustment frame, the adjustment frame movably coupled to the support portion such 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 test device of claim 1, wherein the spacer and the stop are paraffin components.