CN112923858B - Testing device - Google Patents
Testing device Download PDFInfo
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- CN112923858B CN112923858B CN202110088814.5A CN202110088814A CN112923858B CN 112923858 B CN112923858 B CN 112923858B CN 202110088814 A CN202110088814 A CN 202110088814A CN 112923858 B CN112923858 B CN 112923858B
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- impeller
- motor
- positioning
- positioning part
- testing device
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
- G01B11/04—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness specially adapted for measuring length or width of objects while moving
- G01B11/043—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness specially adapted for measuring length or width of objects while moving for measuring length
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P1/00—Details of instruments
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/36—Devices characterised by the use of optical means, e.g. using infrared, visible, or ultraviolet light
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- Engineering & Computer Science (AREA)
- Electromagnetism (AREA)
- Power Engineering (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Abstract
The invention provides a testing device, which comprises a base, a driving mechanism, a magnetic mechanism and a moving mechanism, wherein the driving mechanism, the magnetic mechanism and the moving mechanism are connected to the base; the driving mechanism comprises a mounting frame, a control piece and a motor, wherein the control piece and the motor are respectively assembled on the mounting frame; the magnetic mechanism comprises a fixed frame and an impeller which is rotatably assembled on the fixed frame, wherein a magnet is arranged on the impeller, and the magnet interacts with a rotating magnetic field generated by the motor to enable the impeller to rotate; the fixed frame is provided with a second positioning part, the first positioning part and the second positioning part move relatively under the driving 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. 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.
Description
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, it is necessary 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 and is characterized by also comprising a driving mechanism, a magnetic mechanism and a moving mechanism, wherein the driving mechanism is connected to the base;
the driving mechanism comprises a mounting frame, a control piece and a motor, wherein the control piece and the motor are respectively assembled on the mounting frame;
the magnetic mechanism comprises a fixed frame and an impeller which is rotatably assembled on the fixed frame, wherein a magnet is arranged on the impeller, and the magnet interacts with a rotating magnetic field generated by the motor to enable the impeller to rotate;
the fixed frame is provided with a second positioning part, the second positioning part and the first positioning part are oppositely arranged, the first positioning part and the second positioning part are driven by the moving mechanism to relatively move, 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, the moving mechanism is assembled on the bottom plate, and the magnetic force mechanism is assembled on the moving mechanism;
the supporting plate is connected to the bottom plate and extends towards one side far away from the bottom plate, and the driving mechanism is assembled on the supporting plate and arranged opposite to the magnetic mechanism.
In one embodiment, the mounting frame comprises:
a mounting part on which the control member is fitted, the mounting part having a through hole;
an accommodating portion connected to the mounting portion and arranged around the through hole, the accommodating portion having an accommodating cavity communicating with the through hole, the motor being fitted in the accommodating cavity;
a connecting part connected to the mounting part and used for connecting with the support plate;
and the first positioning part is used for being connected with the second positioning part in a nested manner, and the first positioning part is connected to the mounting part and extends towards one side of the magnetic mechanism.
In one embodiment, a positioning column is arranged in the accommodating part, one end of the positioning column is fixed on 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 a stator of the motor is sleeved outside the positioning column.
In an embodiment, a window communicated with the accommodating cavity is arranged on a side wall of the accommodating part, and the window extends to the bottom wall.
In one embodiment, a limiting groove is formed in the mounting portion, the control piece is assembled in the limiting groove, and the limiting groove is communicated with the through hole.
In one embodiment, the control member is attached to the bottom of the limiting groove, a receiving groove and a through hole are formed in the bottom of the limiting groove, and a part protruding from the end face of the control member is received in the receiving groove or extends out of the mounting frame from the through hole.
In one embodiment, the fixture includes:
the first fixing part is used for being connected with the moving mechanism;
the second fixing part is connected to the first fixing part and extends towards one side far away from the first fixing part;
the supporting part is connected to the second fixing part and extends towards one side of the driving mechanism, and the impeller is rotatably connected to the supporting part;
and the second positioning part is connected to the second fixing part and extends towards one side of the driving mechanism.
In an embodiment, the magnetic mechanism further includes a rotating shaft and a bearing, a fixing groove is disposed at an end of the supporting portion facing the driving mechanism, the bearing is fixed in the fixing groove, the rotating shaft is rotatably connected to the bearing, and the impeller is fixed on the rotating shaft.
In one embodiment, the bottom plate is provided with a strip-shaped connecting groove, the moving mechanism is detachably connected in the connecting groove, and the distance between the moving mechanism and the supporting plate is adjustable.
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 and the motor stator of the blood pump, so that the motor and the impeller are basically coaxial, the accuracy in testing is ensured, and the corresponding relation between the axial distance between the impeller magnet and the motor stator and the rotating speed of the impeller is accurately obtained.
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 a schematic diagram of a base of the testing device shown in FIG. 1;
FIG. 5 is an exploded view of the drive mechanism of the test device of FIG. 1;
FIG. 6 is a cross-sectional view of a mounting bracket of the drive mechanism of FIG. 5;
FIG. 7 is a schematic structural view of a mounting bracket of the drive mechanism of FIG. 5;
FIG. 8 is an enlarged view of section A of the test apparatus of FIG. 2;
FIG. 9 is an exploded view of the motor stator of the drive mechanism of FIG. 5;
fig. 10 is an exploded view of the magnetic mechanism of the test apparatus shown in fig. 1.
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 driving mechanism 30 at least comprises a mounting frame 31, and a control member 32 and a motor 33 respectively mounted on the mounting frame 31. The stator of the motor 33 is electrically connected to the control member 32 and generates a rotating magnetic field.
The magnetic mechanism 40 at least comprises a fixed frame 41 and an impeller 42 which is rotatably assembled on the fixed frame 41, wherein the impeller 42 is provided with a magnet, and the magnet interacts with a rotating magnetic field generated by the motor 33 to rotate the impeller 42.
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 and the impeller 42 are substantially coaxial.
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; 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.
In the test using the test apparatus 100, the first positioning portion 314 and the second positioning portion 414 are first nested with each other, and then the first positioning portion 314 and the second positioning portion 414 are gradually separated from each other. During the separation process, the axial distance values between 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 relation graph is drawn according to the axial distance values, so that the axial distance values between the magnets of the impellers 42 and the stators of the motors 33 directly reflect the rotating speed of the impellers 42. 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 accuracy in testing 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 drive mechanism 30, the magnetic force mechanism 40, and the movement mechanism 50 will be specifically described below.
Referring to fig. 4, 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. 4, 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 is to be understood 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. 5, the driving mechanism 30 at least includes a mounting frame 31, and a control member 32 and a motor 33 respectively connected to the mounting frame 31, wherein a stator of the motor 33 is electrically connected to the control member 32 and generates a rotating magnetic field.
Referring to fig. 6 and 7, 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. 5, 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 bottom of the accommodating groove 3113 is provided with a through hole 3114 to parts such as the pin of the control part 32, the socket wear out, make the better laminating of control part 32 to the bottom surface of spacing 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 motor 33 is accommodated in the accommodating chamber.
Specifically, the mounting portion 311 is provided with a through hole 3115, and the opening end of the accommodating portion 312 is disposed around the hole edge of the through hole 3115. The bottom wall of the accommodating portion 312 is provided with a positioning column 3121 to position the stator of the motor 33, so as to prevent the motor 33 from moving freely in the accommodating portion 312. As shown in fig. 8 and 9, the stator 330 has a passage 335 extending through the center thereof in the axial direction, and the positioning column 3121 is inserted into the passage 335 of the stator 330 to limit the stator 330 in the accommodating portion 312. Preferably, the central axis of the positioning column 3121 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. When the stator 330 is sleeved outside the positioning column 3121, glue can be filled between the end of the stator 330 and the bottom wall of the accommodating portion 312, so that the stator 330 is adhered to the bottom wall of the accommodating portion 312.
As shown in fig. 9, the stator 330 includes at least a plurality of posts 331, a coil winding 332 around the outer circumference 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 column 3121 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.
As shown in fig. 8, the positioning column 3121 includes a positioning main body 3121a and a guide portion 3121b connected. The positioning main body 3121a is substantially a column structure, and the size and shape of the positioning main body 3121a are matched with the size and shape of the positioning hole 3331 of the back plate 333, so that the back plate 333 is fixed on the positioning column 3121. The guiding portion 3121b is connected to an end of the positioning main body 3121a far from the bottom wall of the accommodating portion 312, the guiding portion 3121b is generally of a conical structure, and the outer diameter of the guiding portion 3121b is gradually reduced along the direction from the bottom wall of the accommodating portion 312 to the open end thereof, so as to conveniently sleeve the back plate 333 outside the positioning column 3121.
As shown in fig. 7, the side wall of the receiving portion 312 is provided with a first window 3122, and the first window 3122 communicates with the inner cavity of the receiving portion 312. Preferably, the first window 3122 extends to the bottom wall of the receiving portion 312. When assembled, glue may be poured between the end of the stator 330 and the bottom wall of the receiving portion 312 through the first window 3122 to fixedly connect the two. Moreover, the first window 3122 can facilitate an operator to observe the state of the stator 330 at any time.
Referring to fig. 6 and 7 again, the connection portion 313 is generally a plate-shaped structure 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, and preferably has a cylindrical structure. One end of the first positioning portion 314 is fixed to the connection 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 the first positioning portion 314 is substantially coaxial with the positioning column 3121 of the accommodating portion 312, so that the first positioning portion 314 is substantially coaxial with the motor 33 mounted on the positioning column 3121.
Referring to fig. 10, the magnetic structure 40 at least includes a fixing frame 41, an impeller 42, a bearing 43 and a rotating shaft 44, wherein the impeller 42 is rotatably mounted on the fixing frame 41 through the bearing 43 and the rotating shaft 44.
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.
One end of the support portion 413 is fixed to the fourth mounting surface 4120, and the other end extends toward the driving mechanism 30. The impeller 42 is rotatably coupled within the support 413.
Specifically, one end of the support portion 413 facing the driving mechanism 30 is provided with a fixing groove 4131, and the bearing 43 is fixed in the fixing groove 4131. The side wall of the support part 413 is provided with a fixing hole 4132, and the fixing hole 4132 communicates with the fixing groove 4131. When assembling, a fastener such as a pin or a bolt is inserted through the fixing hole 4132 until abutting against the bearing 43, so that the bearing 43 is fixed in the fixing groove 4231. Then, the rotating shaft 44 is fixed in the inner cavity of the bearing 43, and the impeller 42 is fixed on the rotating shaft 44, so that the impeller 42 is rotatably fitted on the support 413. 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.
The second positioning portion 414 has a substantially cylindrical structure, and preferably has 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 the second positioning portion 414 is substantially coaxial with 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, and the operator can easily observe the state of the impeller 424 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 is also called as a grating ruler displacement sensor, can be used for detecting linear displacement or angular displacement by utilizing the optical principle of the grating, and has the characteristics of large detection range, high detection precision and high response speed, and signals output by the measurement of the grating ruler are digital pulses.
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.
When the testing device 100 is used for testing, the first positioning portion 314 and the second positioning portion 414 are first nested until the first positioning portion 314 and the second positioning portion 414 cannot be nested, and then the first positioning portion 314 and the second positioning portion 414 are gradually separated. During the separation process, the axial distance values of the columns 331 of the stators 330 and the magnets 422 of the impeller 42 and the impeller rotating speed at the axial distance are recorded by using the distance measuring piece, and a relation graph is drawn according to the axial distance values, so that the axial distance values of the magnets 422 of the impeller 42 and the stators 330 of the motor 33 directly reflect the rotating speed of the impeller 42. 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 ensured to be substantially coaxial at any time, and the accuracy in the test is ensured, so that the corresponding relation between the rotating speed of the impeller and the axial distance between the impeller magnet and the motor stator is accurately obtained.
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 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.
Claims (10)
1. The testing device comprises a base and is characterized by further comprising a driving mechanism connected to the base, a magnetic mechanism and a moving mechanism used for adjusting the relative position of the driving mechanism and the magnetic mechanism;
the driving mechanism comprises a mounting frame, a control piece and a motor, wherein the control piece and the motor are respectively assembled on the mounting frame, a stator of the motor is electrically connected with the control piece, and the mounting frame is provided with a first positioning part;
the magnetic mechanism comprises a fixed frame and an impeller which is rotatably assembled on the fixed frame, wherein a magnet is arranged on the impeller, and the magnet interacts with a rotating magnetic field generated by the motor to enable the impeller to rotate;
the fixed frame is provided with a second positioning part, the second positioning part and the first positioning part are oppositely arranged, the first positioning part and the second positioning part are driven by the moving mechanism to relatively move, and when the first positioning part and the second positioning part are mutually nested, the motor and the impeller are basically coaxial;
and adjusting the first positioning part and the second positioning part to be gradually separated, and recording the axial distance between the stators of the multiple groups of motors and the magnet of the impeller and the impeller rotating speed under the axial distance in the separation process so as to obtain the corresponding relation between the axial distance between the magnet of the impeller and the stator of the motor and the impeller rotating speed.
2. The testing device of claim 1, wherein the base comprises a base plate and a support plate, the moving mechanism is mounted on the base plate, and the magnetic force mechanism is mounted on the moving mechanism;
the supporting plate is connected to the bottom plate and extends towards one side far away from the bottom plate, and the driving mechanism is assembled on the supporting plate and arranged opposite to the magnetic mechanism.
3. The testing device of claim 2, wherein the mounting bracket comprises:
a mounting part on which the control member is fitted, the mounting part having a through hole;
an accommodating portion connected to the mounting portion and arranged around the through hole, the accommodating portion having an accommodating cavity communicating with the through hole, the motor being fitted in the accommodating cavity;
a connecting part connected to the mounting part and used for connecting with the support plate;
and the first positioning part is used for being connected with the second positioning part in a nested manner, and the first positioning part is connected to the mounting part and extends towards one side of the magnetic mechanism.
4. The testing device as claimed in claim 3, wherein a positioning column is disposed in the accommodating portion, one end of the positioning column is fixed to a bottom wall of the accommodating cavity opposite to the through hole, the other end of the positioning column extends toward one side of the through hole, and a stator of the motor is sleeved outside the positioning column.
5. The testing device of claim 4, wherein the side wall of the accommodating portion is provided with a window communicated with the accommodating cavity, and the window extends to the bottom wall.
6. The testing device of claim 3, wherein the mounting portion is provided with a limiting groove, the control member is assembled in the limiting groove, and the limiting groove is communicated with the through hole.
7. The testing device of claim 6, wherein the control member is attached to a bottom of the retaining groove, the bottom of the retaining groove being provided with a receiving groove and a through hole, the member protruding from the end surface of the control member being received in the receiving groove or extending from the through hole to outside the mounting bracket.
8. The testing device of claim 2, wherein the fixture comprises:
the first fixing part is used for being connected with the moving mechanism;
the second fixing part is connected to the first fixing part and extends towards one side far away from the first fixing part;
the supporting part is connected to the second fixing part and extends towards one side of the driving mechanism, and the impeller is rotatably connected to the supporting part;
and the second positioning part is connected to the second fixing part and extends towards one side of the driving mechanism.
9. The testing device of claim 8, wherein the magnetic mechanism further comprises a rotating shaft and a bearing, a fixing groove is formed in one end of the supporting portion facing the driving mechanism, the bearing is fixed in the fixing groove, the rotating shaft is rotatably connected with the bearing, and the impeller is fixed on the rotating shaft.
10. The testing device as claimed in claim 2, wherein the bottom plate is provided with a strip-shaped connecting groove, the moving mechanism is detachably connected in the connecting groove, and the distance between the moving mechanism and the supporting plate is adjustable.
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| CN202110088814.5A CN112923858B (en) | 2021-01-22 | 2021-01-22 | Testing device |
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| CN202110088814.5A CN112923858B (en) | 2021-01-22 | 2021-01-22 | Testing device |
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| CN114344703B (en) * | 2021-12-13 | 2024-07-02 | 深圳核心医疗科技股份有限公司 | Magnetic force test fixture |
| CN114487466B (en) * | 2021-12-22 | 2023-11-24 | 浙江英洛华磁业有限公司 | A rotor assembly speed testing device |
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| EP3400035B1 (en) * | 2016-01-06 | 2024-05-22 | Bivacor Inc. | Heart pump with impeller rotational speed control |
| CN106823028A (en) * | 2017-01-16 | 2017-06-13 | 哈尔滨理工大学 | A kind of blood pump suspended impeller axial shift measuring instrument and its dynamic testing method |
| CN110227193B (en) * | 2019-04-25 | 2021-10-15 | 深圳核心医疗科技有限公司 | Hall signal calibration platform |
| CN211856864U (en) * | 2019-12-30 | 2020-11-03 | 深圳核心医疗科技有限公司 | Magnetic field detection device |
| CN212300237U (en) * | 2020-06-22 | 2021-01-05 | 深圳核心医疗科技有限公司 | Hall signal calibration device |
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Address after: 518000 1601, building D3, Nanshan Zhiyuan, No. 1001, Xueyuan Avenue, Changyuan community, Taoyuan Street, Nanshan District, Shenzhen, Guangdong Patentee after: Shenzhen Core Medical Technology Co.,Ltd. Address before: 518000 qiugu 202, workshop a, fengyeyuan industrial plant, Liuxian 2nd Road, Xingdong community, Xin'an street, Bao'an District, Shenzhen City, Guangdong Province Patentee before: SHENZHEN CORE MEDICAL TECHNOLOGY Co.,Ltd. |
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