CN216669085U - Magnetic force test fixture - Google Patents

Abstract

The utility model belongs to the technical field of magnetic force testing tools, and particularly relates to a magnetic force testing tool which comprises a force measuring component, a first mounting component and a second mounting component, wherein the first mounting component is used for mounting an impeller, the first mounting component can drive the impeller to move along the force measuring direction, the central axis of the impeller can be consistent with the force measuring direction when the first mounting component is positioned at a first force measuring position, and the central axis of the impeller can be perpendicular to the force measuring direction when the first mounting component is positioned at a second force measuring position. The second mounting assembly is used for mounting the stator and the central permanent magnet, can move in the force measuring direction, can also apply force to the force measuring assembly under the action of magnetic force, can also drive the second mounting assembly to move in the force measuring direction, and can measure the value in the force measuring direction received by the second mounting assembly. The magnetic force testing tool can test various magnetic forces received by the impeller.

Description

Magnetic force test tool

Technical Field

The utility model belongs to the technical field of magnetic force testing tools, and particularly relates to a magnetic force testing tool.

Background

The full magnetic suspension blood pump has the advantages of better blood compatibility, small blood destruction, better durability and the like compared with a mechanical contact type blood pump due to the fact that the impeller is suspended and rotated in the blood pump body through the magnetic suspension technology, and a large number of researchers and commercial companies are attracted to be put into development.

When the impeller of the full-magnetic suspension blood pump is in a suspension rotating state during working, the impeller needs to be precisely designed for reliably suspending the impeller under the action of magnetic force in the working process, and the conventional magnetic force testing equipment cannot realize comprehensive testing of various magnetic forces applied to the impeller.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects of the prior art and provide a magnetic force testing tool which can comprehensively test various magnetic forces on an impeller.

The utility model provides a magnetic force test fixture, can test the magnetic force between the stator of the pump body and the rotor magnet of impeller and the central permanent magnet of the pump body with the magnetic force between the rigidity magnetic ring of impeller, magnetic force test fixture includes:

the force measuring assembly is provided with a force measuring direction;

the first mounting assembly is used for mounting the impeller, can drive the impeller to move along the force measuring direction, and has a first force measuring position and a second force measuring position relative to the force measuring assembly; when the first mounting assembly is located at the first force measuring position, the central axis of the impeller can be consistent with the force measuring direction, and when the first mounting assembly is located at the second force measuring position, the central axis of the impeller can be perpendicular to the force measuring direction;

the second mounting assembly is used for mounting the stator and the central permanent magnet, the second mounting assembly can move in the force measuring direction, the second mounting assembly can apply force to the force measuring assembly under the action of magnetic force, the force measuring assembly can also drive the second mounting assembly to move in the force measuring direction, and the force measuring assembly can measure the force value received by the second mounting assembly in the force measuring direction.

Optionally, the device further comprises an abutting piece and a sliding table assembly, the abutting piece can abut against the force measuring assembly, the abutting piece and the second mounting assembly are both mounted on the sliding table assembly, and the second mounting assembly drives the abutting piece to abut against and push the force measuring assembly along the force measuring direction through the sliding table assembly under the action of the magnetic force; the force measuring assembly can pull the abutting connection piece to enable the sliding table assembly to drive the second mounting assembly to move.

Optionally, the sliding table assembly includes a fixing member, a guide rail, an air bearing and a moving seat, the guide rail is fixedly connected to the fixing member, an extending direction of the guide rail is consistent with the force measuring direction, the air bearing is slidably sleeved on the guide rail, and the moving seat is fixedly connected to the air bearing; the abutting piece and the second mounting assembly are mounted on the movable seat, the second mounting assembly can drive the movable seat to move in the force measuring direction, and the abutting piece can move along with the movable seat to abut against and push the force measuring assembly.

Optionally, the magnetic force test tool further comprises a base, the sliding table assembly and the force measuring assembly are mounted on the base, and the first force measuring position and the second force measuring position are arranged on the base and are close to the sliding table assembly.

Optionally, the force measuring device further comprises an abutting piece connected with the second mounting assembly, the second mounting assembly abuts against the force measuring assembly through the abutting piece, and the force measuring assembly pulls the second mounting assembly through the abutting piece; the butt joint piece has first butt joint portion and second butt joint portion, first butt joint portion with second butt joint portion follow dynamometry direction interval sets up, the dynamometry subassembly has the dynamometry head, the dynamometry head can measure the value that the second installation component received the power in the dynamometry direction, the dynamometry head set up in between first butt joint portion with the second butt joint portion, first butt joint portion with second butt joint portion all can with the dynamometry head butt, the dynamometry subassembly passes through butt joint piece pulling when the second installation component, first butt joint portion with the dynamometry head butt, when the second installation component passes through butt joint piece butt pushes away the dynamometry subassembly, second butt joint portion with the dynamometry head butt.

Optionally, the dynamometry subassembly includes the dynamometer, the dynamometer include digital display device and with the digital display device is connected, and contains pressure sensor's dynamometry head, the dynamometry head can measure the second installation subassembly receives the value of dynamometry ascending power, and can with the value is transmitted for the digital display device.

Optionally, the magnetic force test tool further comprises a clamping component, and the clamping component can clamp the first mounting component and the second mounting component together to maintain the first mounting component and the second mounting component at a preset distance.

Optionally, the first mounting assembly includes a first mounting seat, a position adjusting mechanism and a rotary table, the first mounting seat is fixedly connected to the position adjusting mechanism, the position adjusting mechanism can adjust the position of the first mounting seat in a three-dimensional space, the position adjusting mechanism can drive the first mounting seat to move along the force measuring direction, the rotary table is mounted on the first mounting seat, the rotary table can mount the impeller, and the rotary table can drive the impeller to rotate around the central axis of the impeller;

and/or the second mounting assembly comprises a second mounting seat, a stator seat and a mounting piece, the second mounting seat can move along the force measuring direction relative to the first mounting assembly under the action of the magnetic force, the stator seat is used for mounting the stator, the stator seat is fixedly connected with the second mounting seat, the mounting piece is mounted on the stator seat, and the mounting piece is used for mounting the central permanent magnet.

Optionally, the first mounting assembly has a first annulus with a central axis coincident with a central axis of the impeller mounted on the first mounting assembly; magnetic force test fixture still includes the calibration piece, the calibration piece can detachably install in on the second installation component, the calibration piece has the second anchor ring, the calibration piece install in when the second installation component is last, the central axis of second anchor ring with on the second installation component the central axis coincidence of stator, the second anchor ring can with the parallel butt of first anchor ring, just the second anchor ring with during the parallel butt of first anchor ring, the central axis of second anchor ring with the central axis coincidence of first anchor ring.

Based on the magnetic force testing tool, because the first mounting component for mounting the impeller of the magnetic force testing tool can drive the impeller to move along the force measuring direction, the first mounting component has a first force measuring position and a second force measuring position relative to the force measuring component, the central axis of the impeller can be coincided with the force measuring direction when the first mounting component is positioned at the first force measuring position, the central axis of the impeller can be perpendicular to the force measuring direction when the first mounting component is positioned at the second force measuring position, the second mounting component for mounting the stator and the central permanent magnet can move along the force measuring direction, the second mounting component can apply force to the force measuring component under the action of magnetic force, the force measuring component can drive the second mounting component to move along the force measuring direction relative to the first mounting component, so that the magnetic force applied to the impeller in the axial direction can be tested when the first mounting component is positioned at the first force measuring position, for example, the axial attractive force between the stator and the rotor magnet of the impeller and the axial repulsive force between the central permanent magnet and the stiffness magnetic ring of the impeller are used, and the impeller is driven to move along the force measuring direction through the first mounting assembly at the second force measuring position, so that the second mounting assembly can test the magnetic force applied to the impeller in the radial direction at the second force measuring position, for example, the radial repulsive force between the central permanent magnet and the stiffness magnetic ring of the impeller, and the magnetic force testing tool can test various magnetic forces.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments 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 it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a simplified structural schematic of a pump body according to one embodiment;

fig. 2 is a schematic structural diagram of the magnetic force testing tool provided in the embodiment of the present invention at a viewing angle, wherein the first mounting assembly at the first force measuring position is clamped with the second mounting assembly by the clamping assembly;

FIG. 3 is a schematic structural view of the magnetic testing tool shown in FIG. 2 at another angle;

FIG. 4 is a schematic view of a force measuring assembly of the magnetic force testing tool shown in FIG. 2;

FIG. 5 is a schematic structural view of the first mounting assembly of the magnetic testing tool shown in FIG. 2 with an impeller mounted thereon;

FIG. 6 is an exploded view of the first mounting assembly of FIG. 5 with the impeller mounted;

fig. 7 is a schematic structural view of the sliding table assembly provided with the abutting piece of the magnetic force testing tool shown in fig. 2;

FIG. 8 is a schematic structural view of the abutting member of FIG. 7;

FIG. 9 is a schematic structural diagram of the second mounting assembly of the magnetic testing tool shown in FIG. 2 with the stator and the central permanent magnet mounted thereon;

FIG. 10 is an exploded view of the second mounting assembly of FIG. 9 with the stator and central permanent magnet mounted thereto;

FIG. 11 is a schematic structural view of a first mounting assembly, an alignment member and a second mounting assembly provided by the present invention;

fig. 12 is a schematic structural view of the calibration piece shown in fig. 11.

The reference numbers illustrate:

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.

The magnetic force test fixture provided by the embodiment can be used for testing magnetic force action between magnetic bodies, is particularly suitable for testing various magnetic force actions between magnetic components in a pump body, and the pump body can be an artificial blood pump. Taking the pump body 10 shown in fig. 1 as an example, the pump body 10 includes a housing 12, an impeller 14 and a stator 16, the housing 12 has a blood cavity 12a, the blood cavity 12a has a blood flow inlet (not shown) and a blood flow outlet (not shown), and a central column 18 is disposed in the blood cavity 12 a; the impeller 14 is accommodated in the blood cavity 12a, the impeller 14 has a central hole (not shown), the central column 18 is inserted into the central hole of the impeller 14, the impeller 14 can rotate in a suspended manner around the central axis of the impeller 14 without contacting the central column 18, and blood flows into the blood cavity 12a from the blood flow inlet and then flows out from the blood flow outlet by the rotation of the impeller 14; a stator 16 is located below the housing 12, the stator 16 providing a rotating magnetic field to the impeller 14 to enable the impeller 14 to rotate about a central axis of the impeller 14. In the pump body 10, in order to realize the suspended rotation of the stator 16 in the blood cavity 12a, a rotor magnet 14a and a rigidity magnetic ring 14b are arranged in the impeller 14, a central permanent magnet 18a is arranged in the central column 18, and during the rotation of the impeller 14, the impeller 14 is subjected to the axial attraction force between the rotor magnet 14a and the stator 16, the axial repulsion force between the rigidity magnetic ring 14b and the central permanent magnet 18a, and the radial repulsion force between the rigidity magnetic ring 14b and the central permanent magnet 18 a. Specifically, the rotor magnet 14a, the central permanent magnet 18a, and the stiffness magnetic ring 14b are all ring-shaped, and the central axis of the rotor magnet 14a and the central axis of the stiffness magnetic ring 14b coincide with the central axis of the impeller 14.

Referring to fig. 2 and fig. 3, the magnetic force testing tool 1000 according to the present embodiment can be used to test the magnetic force between the stator 16 of the pump body 10 and the rotor magnet 14a of the impeller 14, and the magnetic force between the central permanent magnet 18a of the pump body 10 and the stiffness magnetic ring 14b of the impeller 14. Specifically, the magnetic force between the stator 16 and the rotor magnet 14a of the impeller 14 is specifically an axial attractive force between the rotor magnet 14a and the stator 16; the magnetic force between central permanent magnet 18a and stiffness magnet ring 14b of impeller 14 is specifically the axial repulsive force between stiffness magnet ring 14b and central permanent magnet 18a, and the radial repulsive force between stiffness magnet ring 14b and central permanent magnet 18 a.

The axial direction described here is a direction that coincides with the direction in which the center axis of the impeller 14 extends, i.e., is parallel to or coincides with the direction in which the center axis extends, and the radial direction is perpendicular to the axial direction. The axial attractive force and the axial repulsive force are axial magnetic forces, and the radial repulsive force is a radial magnetic force.

The magnetic force testing tool 1000 of the present embodiment includes a force measuring assembly 100, a first mounting assembly 200, and a second mounting assembly 300.

The force measuring assembly 100 has a force measuring direction. The force measuring assembly 100 is used to measure the magnitude of force. Referring to fig. 4, in particular, the force measuring assembly 100 includes a force measuring cell 110, wherein the force measuring cell 110 is capable of measuring a force acting on the force measuring cell 110 in a force measuring direction.

The first mounting assembly 200 is used to mount the impeller 14. Specifically, the connection between the first mounting assembly 200 and the impeller 14 may be a snap fit, a clamp, a threaded fastener, and the like. The first mounting assembly 200 is capable of moving the impeller 14 in a force measuring direction. The first mounting assembly 200 has a first force measuring position and a second force measuring position relative to the force measuring assembly 100. The first mounting assembly 200 is capable of aligning the central axis of the impeller 14 on the first mounting assembly 200 with the force-measuring direction when in the first force-measuring position, i.e., the first mounting assembly 200 is capable of measuring an axial magnetic force, e.g., an axial attractive force between the rotor magnet 14a and the stator 16, or an axial repulsive force between the stiffness magnet ring 14b and the central permanent magnet 18a when in the first force-measuring position. The central axis of the impeller 14 is coincident with the force measuring direction, which means that the central axis of the impeller 14 is parallel to or coincident with the force measuring direction. The first mounting assembly 200 is capable of having the central axis of the impeller 14 on the first mounting assembly 200 perpendicular to the force-measuring direction when in the second force-measuring position, i.e., the first mounting assembly 200 is capable of being used to measure a radial magnetic force, e.g., a radial repulsive force between the stiffness magnet ring 14b and the central permanent magnet 18a, when in the second force-measuring position.

In the illustrated embodiment, there are two first mounting assemblies 200, and the two first mounting assemblies 200 can be mounted at a first force measuring position and a second force measuring position, respectively. For example, in the embodiment shown in fig. 2 and 3, the first mounting assembly 200 located opposite the force-measuring assembly 100 is located in a first force-measuring position, and the other first mounting assembly 200 is located in a second force-measuring position. The first mounting assembly 200 is configured to test axial magnetic force when in the first force measuring position and to test radial magnetic force when the first mounting assembly 200 is in the second force measuring position.

In other embodiments, only one first mounting assembly 200 may be provided, in which case the first mounting assembly 200 may be replaced between a first force measuring position and a second force measuring position. That is, when the axial magnetic force is to be tested, the first mounting assembly 200 is disposed at the first force measuring position, and when the radial magnetic force is to be tested, the first mounting assembly 200 is replaced from the first force measuring position to the second force measuring position, so that one first mounting assembly 200 can be reduced compared with the case of disposing two first mounting assemblies 200, and the manufacturing cost can be reduced. In other embodiments, the number of the first mounting assemblies 200 may be three or more, and the number of the first mounting assemblies 200 may be configured as required.

Referring to fig. 5 and 6, in one embodiment, the first mounting assembly 200 includes a first mounting base 210, a position adjustment mechanism 220, a rotating base 230, and a fixing base 240. The first mounting base 210 is fixedly connected to the position adjusting mechanism 220, the rotating platform 230 is mounted on the first mounting base 210, the fixing base 240 is fixedly connected to the rotating platform 230, and the fixing base 240 is used for mounting the impeller 14. The position adjusting mechanism 220 can adjust the position of the first mounting seat 210 in the three-dimensional space, and the position adjusting mechanism 220 can also drive the first mounting seat 210 to move along the force measuring direction, so that the position of the impeller 14 can be adjusted and the impeller 14 can be driven to move along the force measuring direction through the position adjusting mechanism 220.

In one embodiment, the position adjusting mechanism 220 is a three-dimensional sliding table having three differential heads, that is, the movement of the first mounting base 210 in a three-dimensional space is divided into three movements in directions perpendicular to each other, the three differential heads are respectively adjusted to move in one direction, and the first mounting base 210 can be moved to any position in the three-dimensional space by adjusting the differential heads in the corresponding directions. One of the three differential heads can drive the first mounting base 210 to move in the force measuring direction.

The rotating platform 230 can rotate the fixing base 240 and the impeller 14 around the central axis of the impeller 14. The rotating platform 230 is arranged to drive the impeller 14 to rotate on a plane perpendicular to the central axis, so as to find the maximum value of the axial attraction force between the rotor magnet 14a and the stator 16, and thus the maximum axial attraction force between the rotor magnet 14a and the stator 16 can be measured, so as to provide more accurate reference data for the system design of the subsequent pump body. Specifically, the impeller 14 is rotated by a certain angle by clockwise and counterclockwise rotations, a periodic variation of the axial attraction force is found, and then the impeller 14 is positioned at the maximum of the axial attraction force and the test is performed.

The entire rotating platform 230 may be configured to be rotatable relative to the first mounting base 210, and at this time, the rotating platform 230 is rotatably connected to the first mounting base 210; the rotation platform 230 may be partially rotatable, in which case, the rotation platform 230 should have a fixed portion fixedly connected to the first mounting base 210 and a rotating portion rotatably connected to the fixed portion, and the fixing base 240 is fixedly connected to the rotating portion. Further, the rotary table 230 has a reading thereon so that the operator can know the angle of rotation of the impeller 14 by the reading. In one embodiment, the rotation stage 230 is a relatively precise manual rotation stage.

The fixing base 240 can be fixed to the rotation base 230 by means of screws, clamping, or the like. The rotating stage 230 can drive the fixing base 240 to rotate. In one embodiment, the fixing base 240 is provided with a first positioning pillar 242 for positioning the impeller 14, and when the impeller 14 is mounted on the fixing base 240, the first positioning pillar 242 is partially received in the central hole of the impeller 14, so that the central axis of the impeller 14 coincides with the central axis of the first positioning pillar 242. Specifically, the impeller 14 can be fixed to the fixing base 240 by a screw fastener, a snap fit, or the like.

It should be noted that the fixing seat 240 may be omitted, and the impeller 14 may be directly fixed to the rotating platform 230, or both the rotating platform 230 and the fixing seat 240 are omitted, and at this time, the impeller 14 may be directly fixed to the first mounting seat 210; alternatively, only the rotating platform 230 is omitted, and then the fixing base 240 is fixed to the first mounting base 210.

Referring again to fig. 2 and 3, a second mounting assembly 300 is used to mount the stator 16 and the central permanent magnet 18 a. The second mounting assembly 300 is used to mount the stator 16 and the central permanent magnet 18 a. The second mounting assembly 300 can be disposed proximate to the first force measurement location; the second mounting assembly 300 can also be disposed proximate to a second force measurement location. Specifically, if the axial magnetic force is tested, the second mounting assembly 300 is disposed near the first force measuring position and opposite to the first mounting assembly 200 at the first force measuring position; if a radial magnetic force is being tested, then the second mounting assembly 300 is positioned proximate to the second force measurement location and opposite the first mounting assembly 200 at the second force measurement location. In one embodiment, the number of the second mounting assemblies 300 is one, and the axial magnetic force and the radial magnetic force are respectively tested by replacing the positions of the second mounting assemblies 300, so that the number of parts of the magnetic force testing tool 1000 is reduced, and the tool cost is reduced. It should be noted that, in other embodiments, there may be a plurality of second mounting assemblies 300, and the number of the second mounting assemblies 300 may be configured as needed.

The second mounting assembly 300 can move in the force measuring direction, the second mounting assembly 300 can also apply force to the force measuring assembly 100 under the action of magnetic force, and the force measuring assembly 100 can also drive the second mounting assembly 300 to move in the force measuring direction, wherein the force measuring assembly 100 can measure the force value in the force measuring direction received by the second mounting assembly 300. Specifically, the second mounting assembly 300 can directly or indirectly apply an acting force to the force-measuring assembly 100 under the action of the magnetic force, the force-measuring assembly 100 can measure the value of the acting force, and the value of the acting force is the value of the force applied to the second mounting assembly 300, i.e. the value of the measured magnetic force; the force measuring assembly 100 can also directly or indirectly drive the second mounting assembly 300 to move, and the value of the acting force applied to the second mounting assembly 300 by the force measuring assembly 100 through the measurement of the force measuring assembly 100 driving the second mounting assembly 300 to move in the force measuring direction is the value of the force received by the second mounting assembly 300, namely the value of the magnetic force. The magnetic force is, for example, an axial attractive force between the rotor magnet 14a and the stator 16, an axial repulsive force between the rigid magnet ring 14b and the central permanent magnet 18a, or a radial repulsive force between the rigid magnet ring 14b and the central magnet. Specifically, the force measurement assembly 100 measures the value of the force in the force measurement direction received by the second mount assembly 300 through the force gauge 110.

In one embodiment, force in the force measuring direction is applied directly or indirectly to force measuring assembly 100 by moving second mounting assembly 300 under magnetic force when either the axial repulsion force between stiffness magnet ring 14b and center permanent magnet 18a or the radial repulsion force between stiffness magnet ring 14b and center magnet 18a is tested. When the axial attraction force between the rotor magnet 14a and the stator 16 is tested, the force is applied directly or indirectly to the second mounting assembly 300 through the force measuring assembly 100 to move the second mounting assembly 300 away from the first mounting assembly 200.

In another embodiment, the axial repulsive force between the stiffness magnetic ring 14b and the central permanent magnet 18a, or the radial repulsive force between the stiffness magnetic ring 14b and the central magnet 18a, and the attractive force between the rotor magnet 14a and the stator 16 of the second mounting assembly 300 drive the second mounting assembly 300 to move through magnetic force, so that the measurement of the magnetic force is realized in a manner of directly or indirectly applying the acting force in the force measuring direction to the force measuring assembly 100.

In one embodiment, the magnetic force testing tool 1000 further comprises an abutting member 400, the abutting member 400 can abut against the force measuring assembly 100, the abutting member 400 is connected with the second mounting assembly 300, the second mounting assembly 300 abuts against and pushes the force measuring assembly 100 through the abutting member 400, and the force measuring assembly 100 pulls the second mounting assembly 300 through the abutting member 400. That is, the second mounting assembly 300 moves under the action of the magnetic force to drive the abutting member 400 to abut against and push the force measuring assembly 100, so that the magnetic force is transmitted to the force measuring assembly 100, and the force value is measured by the force measuring assembly 100; the force measuring assembly 100 pulls the abutment member 400 to apply a force to the second mounting assembly 300. Specifically, the abutment 400 can abut against the load cell 110, the second mounting assembly 300 pushes against the load cell 110 through the abutment 400, and the load cell assembly 100 pulls the abutment 400 through the load cell 110 to pull the second mounting assembly 300.

Further, magnetic test frock 1000 still includes slip table subassembly 500, and butt 400 and second installation component 300 are all installed on slip table subassembly 500 to make butt 400 and second installation component 300 pass through slip table subassembly 500 and connect. The second mounting assembly 300 drives the abutting member 400 to push the force measuring assembly 100, specifically, the force measuring cell 110, along the force measuring direction through the sliding table assembly 500 under the action of the magnetic force. The force measuring assembly 100 can pull the abutting member 400 to make the sliding table assembly 500 drive the second mounting assembly 300 to move.

Specifically, in the illustrated embodiment, the second mounting assembly 300 is detachably connected to the sliding table assembly 500, so that the axial magnetic force and the radial magnetic force can be respectively tested by replacing the second mounting assembly 300, which is not only beneficial to reducing the number of components of the magnetic force testing tool 100, but also convenient for the disassembling, packaging and transporting of the force measuring testing tool 1000.

Referring to fig. 7, in one embodiment, the sliding table assembly 500 includes a fixed member 510, a guide rail 520, an air bearing 530, and a movable base 540. The guide rail 520 is fixed to the fixing member 510, the extending direction of the guide rail 520 is the same as the force measuring direction, and the air bearing 530 is slidably sleeved on the guide rail 520. The movable base 540 is fixed to the air bearing 530. Wherein, the abutting piece 400 and the second mounting component 300 are both mounted on the moving seat 540. The second mounting assembly 300 can drive the movable base 540 to move in the force measuring direction, and the abutting member 400 can move along with the movable base 540 to push against the force measuring assembly 100, specifically, against the force gauge 110.

The air bearing 530 has the advantages of low friction and high precision, and is beneficial to reducing friction loss and improving the test precision. Specifically, the second mounting assembly 300 is detachably connected to the movable base 540.

Specifically, in the illustrated embodiment, there are two guide rails 520, four fixing members 510, each guide rail 520 corresponds to two fixing members 510, and two ends of each guide rail 520 are respectively fixedly connected to the two fixing members 510.

It should be noted that the force measuring assembly 100 is not limited to be moved and pushed by the second mounting assembly 300, for example, in other embodiments, a guide rail extending along the force measuring direction is provided between the first mounting assembly 200 and the force measuring assembly 100, and the second mounting assembly 300 can directly slide along the guide rail, at this time, the abutting members 400 are not connected by the sliding table assembly 500, and the abutting members 400 are directly fixed to the second mounting assembly 300. Alternatively, the second mounting member 300 directly pushes against the force assembly 100 without the abutment member 400.

Referring to fig. 4 again, in one embodiment, the force gauge 110 includes a digital display device 112 and a force measuring head 114, the force measuring head 114 is connected to the digital display device 112, and the force measuring head 114 can measure the force value in the force measuring direction received by the second mounting assembly 300 and can transmit the force value to the digital display device 112, so that the force value measured by the force gauge 110 can be visually displayed through the digital display device 112, and a worker can conveniently obtain the test data. Specifically, the digital display device 112 is fixedly connected with the force measuring head 114, and the digital display device 112 is electrically connected with the force measuring head 114. In particular, the load cell 114 comprises a pressure sensor. The abutment member 400 can abut against the load cell 114 of the load cell 110, the second mounting assembly 300 pushes the load cell 110 through the abutment member 400, the abutment member 400 abuts against the load cell 114, and when the load cell 110 pulls the abutment member 400, the load cell 114 abuts against the abutment member 400.

Further, the force measuring assembly 100 further comprises an adjustment member 120, the force measuring cell 110 being mounted on the adjustment member 120, the adjustment member 120 being capable of adjusting the position of the force measuring cell 110. Specifically, the digital display device 112 is mounted on the adjusting member 120. In one embodiment, the adjusting member 120 is a one-dimensional sliding table. The adjustment member 120 is capable of adjusting the position of the load cell 110 in the force measuring direction.

Specifically, in the illustrated embodiment, the force measuring assembly 100 further includes a mounting member 130 and a positioning plate 140, the mounting member 130 is fixedly connected to the adjusting member 120, the positioning plate 140 is fixedly connected to the force gauge 110, and the positioning plate 140 is fixedly connected to the mounting member 130. Specifically, the digital display device 112 is fixedly connected to the positioning plate 140.

Referring to fig. 7 and 8, in one embodiment, the abutting member 400 has a first abutting portion 410 and a second abutting portion 420, the first abutting portion 410 and the second abutting portion 420 are disposed at an interval along the force measuring direction, the force measuring head 114 is disposed between the first abutting portion 410 and the second abutting portion 420, both the first abutting portion 410 and the second abutting portion 420 can abut against the force measuring head 114, when the force measuring assembly 100 pulls the second mounting assembly 300 through the abutting member 400, the first abutting portion 410 abuts against the force measuring head 114, and when the second mounting assembly 300 abuts against and pushes the force measuring assembly 100 through the abutting member 400, the second abutting portion 420 abuts against the force measuring head 114. In the illustrated embodiment in particular, the first abutment 410 is closer to the force measuring assembly 100 than the second abutment 420 in the force measuring direction.

More specifically, the load cell 114 has a first sensing surface (not shown) that can abut against the first abutting portion 410 and a second sensing surface (not shown) that can abut against the second abutting portion 420, the first sensing surface facing the first abutting portion 410 and the second sensing surface facing the second abutting portion 420.

Referring to fig. 9 and 10, in one embodiment, the second mounting assembly 300 includes a second mounting base 310, a stator base 320 and a mounting member 330, the second mounting base 310 can move in a force measuring direction relative to the first mounting assembly 200 under the action of magnetic force, the stator base 320 is used for mounting the stator 16, the stator base 320 is fixedly connected to the second mounting base 310, the mounting member 330 is mounted on the stator base 320, and the mounting member 330 is used for mounting the central permanent magnet 18 a. Specifically, the mounting member 330 is provided with a receiving groove 332 capable of receiving the central permanent magnet 18 a.

Specifically, the second mounting base 310 is mounted on the moving base 540 of the slide table assembly 500. The second mounting base 310 is detachably connected to the moving base 540. The stator holder 320 has a mounting groove 322 for mounting the stator 16. The mounting groove 322 and the accommodating groove 332 are respectively provided with a second positioning column 324 for positioning the stator 16 and a third positioning column 334 for positioning the central permanent magnet 18a, and the central axis of the third positioning column 334 coincides with the central axis of the second positioning column 324, so that the central axis of the stator 16 mounted in the mounting groove 322 coincides with the central axis of the central permanent magnet 18a mounted in the accommodating groove 332. In the illustrated embodiment, the second mounting seat 310 has a mounting hole 312, the mounting groove 322 has an opening and a bottom opposite to the opening, an opening edge of the mounting groove 322 is fixedly connected to an opening edge of the mounting hole 312, the mounting member 330 is located outside the bottom of the mounting groove 322, and the bottom of the mounting groove 322 covers the opening of the receiving groove 332.

Specifically, the stator 16 is secured in the stator holder 320 using threaded fasteners 340. Specifically, threaded fastener 340 threadably mates with second locating post 322.

Referring to fig. 2 and 3, in order to facilitate the use of the magnetic force testing tool 1000, the magnetic force testing tool 1000 further includes a base 600, and the base 600 is provided with the first force measuring position and the second force measuring position. The force measuring unit 100 and the sliding table assembly 500 are both fixedly connected to the base 600. Wherein, slip table assembly 500 is close to first dynamometry position and second dynamometry position and sets up. The base 600 facilitates the handling and movement of the assembled magnetic test tool 1000.

In one embodiment, the operation of testing the magnetic force by using the magnetic force testing tool 1000 is as follows:

(1) the axial attraction force between the rotor magnet 14a and the stator 16 is tested:

before testing, the impeller 14 (with the rotor magnet 14a and no stiffness magnetic ring 14b inside) is mounted on the first mounting assembly 200 at the first force measuring position, the second mounting assembly 300 with the stator 16 mounted thereon is mounted on the moving seat 540 of the sliding table assembly 500, the central axis of the stator 16 on the second mounting assembly 300 is overlapped with the central axis of the impeller 14 on the first mounting assembly 200, under the condition of no external force, the first mounting assembly 200 and the second mounting assembly 300 are kept at the minimum distance position due to the axial attraction between the stator 16 and the rotor magnet 14a in the impeller 14, the relative position of the force measuring head 114 and the abutting piece 400 is adjusted, and the force measuring head 114 is in zero-pressure abutting contact with the first abutting portion 410 of the abutting piece 400.

During testing, the adjusting member 120 of the force measuring assembly 100 drives the force gauge 110 to pull the abutting member 400 in a direction away from the second mounting member 300 in the force measuring direction, so that the moving base 540 drives the second mounting member 300 to move in the force measuring direction away from the first mounting member 200. The force measuring head 114 measures the value of the tensile force, which is the value of the axial attraction force between the rotor magnet 14a and the stator 16, and transmits the value of the tensile force to the digital display device 112 for display.

Wherein, through the position of the second mounting assembly 300 on the first mounting assembly 200 or the sliding table assembly 500 in the force measuring direction can be adjusted, the distance between the rotor magnet 14a and the stator 16 can be adjusted, thereby the axial attraction force values of the rotor magnet 14a and the stator 16 at different distances can be measured.

It should be noted that the impeller 14 with the rotor magnet 14a and no stiffness magnetic ring 14b is used for testing in order to avoid interference of the magnetic force between the stiffness magnetic ring 14b and the central permanent magnet 18a on the second mounting assembly 300. In other embodiments, when testing the axial attraction force, the impeller 14 with the built-in rotor magnet 14a and the stiffness magnetic ring 14b may be used for testing, and in this case, the stiffness magnetic ring 14b is not mounted on the second mounting assembly 300.

(2) Axial repulsion force between stiffness magnetic ring 14b and central permanent magnet 18a is tested:

before testing, the impeller 14 (with the built-in rigid magnetic ring 14b and no rotor magnet 14a) is installed on the first installation component 100 at a first force measurement position, the second installation component 300 provided with the stator 16 is installed on the moving seat 540 of the sliding table component 500, the central axis of the stator 16 on the second installation component 300 is overlapped with the central axis of the impeller 14 on the first installation component 200, the impeller 14 is driven to move along the force measurement direction by the first installation component 200, so that the first installation component 200 and the second installation component 300 are spaced at a preset distance on the central axis of the stator 16 or the impeller 14, and the distance between the first installation component 200 and the second installation component 300 is kept; the position of the load cell 114 is adjusted so that the load cell 114 is brought into zero-pressure abutment with the second abutment portion 420 of the abutment member 400.

During testing, the force for keeping the distance between the first mounting assembly 200 and the second mounting assembly 300 is removed, and due to the axial repulsive force of the rigid magnetic ring 14b and the central permanent magnet 18a, the second mounting assembly 300 drives the movable base 540 and the abutting piece 400 which is arranged on the movable base 540 and abutted against the force measuring head 114 at zero pressure before testing to abut against the force measuring head 114 in the direction away from the first mounting assembly 200, so that the force measuring head 114 is subjected to the acting force in the force measuring direction. The force head 114 measures the value of the applied force and displays the measured value of the applied force via the digital display 112 of the force-measuring cell 110. And the value of this force is the value of the axial repulsive force between the rigid magnetic ring 14b and the central permanent magnet 18 a.

By adjusting the position of the first mounting assembly 200 in the force measuring direction, the distance between the stiffness magnetic ring 14b and the central permanent magnet 18a can be adjusted, so that the axial repulsive forces of the stiffness magnetic ring 14b and the central permanent magnet 18a at different distances can be tested.

(3) Radial repulsion force between stiffness magnetic ring 14b and central permanent magnet 18a is tested:

before testing, the impeller 14 (with the built-in stiffness magnetic ring 14b and the rotor magnet 14a) is installed on the first installation component 200 at the second force measuring position, the second installation component 300 provided with the stator 16 is installed on the moving seat 540 of the sliding table component 500, and the central axis of the stator 16 on the second installation component 300 is overlapped with the central axis of the impeller 14 on the first installation component 200; the position of the load cell 114 is adjusted such that the load cell 114 is brought into zero-pressure abutment with the first abutment 410 of the abutment 400.

During testing, the impeller 14 is moved in the force measuring direction away from the force measuring assembly 110 by the position adjusting mechanism 220, because central permanent magnet 18a is positioned within the inner ring of stiffness magnet ring 14b, and there is a radial repulsive force between stiffness magnet ring 14b and central permanent magnet 18a, so that, in the absence of other external forces, central permanent magnet 18a will remain in the middle of stiffness magnet ring 14b and, therefore, moving impeller 14 in a direction away from force measuring assembly 100 in the direction of force measurement, due to the radial repulsion between stiffner magnetic ring 14b and central permanent magnet 18a, so that the second mounting assembly 300 drives the movable base 540 to move away from the force measuring assembly 110, so that the abutting member 400 mounted on the movable base 540 and abutting against the load cell 114 before testing is also moved along with the movable base 540 to push against the load cell 114, so that the load cell 114 is subjected to a force in the force measuring direction. The force measuring head 114 measures the value of the applied force and displays the measured value of the applied force via the digital display 112 of the force measuring cell 110. And the value of this force is the value of the radial repulsive force between the rigid magnetic ring 14b and the central permanent magnet 18 a.

By adjusting the position of the first mounting assembly 200 in the direction perpendicular to the force measuring direction, the position of the stiffness magnetic ring 14b relative to the central permanent magnet 18a in the axial direction of the impeller 14 can be adjusted, so that the radial repulsive force of the stiffness magnetic ring 14b and the central permanent magnet 18a at different positions can be tested.

In order to improve the referential ability of the test data to the subsequent pump body design, before testing the magnetic force, the impeller 14 is driven to rotate on a plane perpendicular to the central axis by the rotating platform 230 so as to find the maximum value of the axial attraction force between the rotor magnet 14a and the stator 16, the maximum axial attraction force between the rotor magnet 14a and the stator 16 is measured, and then the impeller 14 is positioned at the maximum axial attraction force for the subsequent test.

In order to improve the accuracy of the test result, during the test, the impeller 14 on the first mounting assembly 200, the stator 16 on the second mounting assembly 300, the central permanent magnet 18a, etc. should be coaxial as much as possible, i.e. the central axes should coincide as much as possible, for this reason, referring to fig. 11 and 12 together, the magnetic test tool 1000 further includes a calibration member 700, and the calibration member 700 can assist in adjusting the relative positions of the impeller 14 on the first mounting assembly 200 and the stator 16 on the second mounting assembly 300, and the central permanent magnet 18 a. The first mounting assembly 200 has a first annulus 250, the central axis of the first annulus 250 being coincident with the central axis of the impeller 14 mounted on the first mounting assembly 200; the calibration member 700 can be detachably mounted on the second mounting assembly 300, the calibration member 700 has a second annular surface 710, when the calibration member 700 is mounted on the second mounting assembly 300, the second annular surface 710 coincides with a central axis of the stator 16 mounted on the second mounting assembly 300, the second annular surface 710 can be abutted in parallel with the first annular surface 250, when the second annular surface 710 is abutted in parallel with the first annular surface 250, the central axis of the second annular surface 710 coincides with the central axis of the first annular surface 250, so that the central axis of the impeller 14 on the first mounting assembly 200 coincides with the central axis of the stator 16 on the second mounting assembly 300.

In one embodiment, the first ring surface 250 is disposed on the fixing base 240, and a central axis of the first ring surface 250 coincides with a central axis of the first positioning column 242. Specifically, the first annulus 250 is an inner surface of the anchor 240. The aligning member 700 may be detachably mounted to a side of the mounting member 330 remote from the stator holder 320, and the aligning member 700 is detachably coupled to the mounting member 330 by a screw 750. Positioning of the mounting member 330 is accomplished by screws 750 engaging threaded holes in the mounting member 330.

The specific use of the calibration piece 700 is as follows: before testing, the calibration member 700 is mounted on the side of the mounting member 330 of the second mounting assembly 300 away from the stator seat 320, the position of the impeller 14 is adjusted by the position adjusting mechanism 220, so that the calibration member 700 is partially accommodated in the fixing seat 240 of the first mounting assembly 200, the second ring surface 710 of the calibration member 700 is completely attached to the first ring surface 250 of the fixing seat 240, at this time, the second ring surface 710 is in parallel contact with the first ring surface 250 for concentricity calibration, and then the calibration member 700 is removed for magnetic force testing.

To facilitate testing of the magnetic forces of the first and second mounting assemblies 200, 300 for certain distances during the axial repulsive force test, the magnetic force test tool 1000 further includes a snap assembly 800, the snap assembly 800 being capable of snapping the first and second mounting assemblies 200, 300 together to maintain the first and second mounting assemblies 200, 300 at a preset distance to facilitate testing of the axial repulsive forces of the rigid magnetic ring 14b and the central permanent magnet 18a at certain distances. The snap assembly 800 is primarily used to test axial repulsion forces, and because of the mutual repulsion between the rigid magnetic ring 14b and the central permanent magnet 18a, the snap assembly 800 can facilitate the positioning of the relative positions of the first mounting assembly 200 and the second mounting assembly 300 prior to testing the axial repulsion forces.

While the axial repulsion force is tested, the snap assembly 800 is unlocked from the first mounting assembly 200 and the second mounting assembly 300, and the second mounting assembly 300 is moved away from the first mounting assembly 200 by the axial repulsion force between the stiffness magnet ring 14b and the central permanent magnet 18 a.

In one embodiment, the fastening assembly 800 includes a hook 810 and a buckle 820 cooperating with the hook 810. One of the first and second mounting assemblies 200 and 300 is provided with a hook 810, and the other is provided with a hook 420. Specifically, in order to ensure stable positioning, at least two snap assemblies 800 are provided. Specifically, one of the hook 810 and the hook 820 is disposed on the stator seat 320, and the other is disposed on the fixing seat 240 of the first mounting assembly 200.

In one embodiment, to facilitate maintaining the distance between the first and second mounting assemblies 200 and 300 prior to testing the axial attractive force between the rotor magnet 14a and the stator 16, or the distance between the first and second mounting assemblies 200 and 300 prior to testing the axial repulsive force between the stiffness magnet ring 14b and the central permanent magnet 18a, the magnetic test tool 1000 further includes a stop member (not shown) that prevents the second mounting assembly 300 from moving in the force measuring direction. Therefore, before the test, the second mounting assembly 300 is prevented from moving in the force measuring direction by the limiting piece, and the reliability of test data is favorably ensured.

Further, in order to facilitate the test, the magnetic test tool 1000 further comprises a test impeller, and the structure of the test impeller is the same as that of the impeller 14 of the pump body, so that the test impeller can be fixed on the first mounting assembly 200 through the screw holes formed in the test impeller and the screws 750 without damaging the structure of the impeller 14 of the pump body. The test impeller is internally provided with containing grooves for respectively containing the rotor magnet 14a and the rigidity magnetic ring 14 b. At this time, the test is performed by mounting the rotor magnet 14a and/or the rigidity magnet ring 14b of the pump body impeller 14 into the test impeller.

The magnetic force testing tool 1000 at least has the following advantages:

(1) because the first mounting assembly 200 for mounting the impeller 14 of the magnetic force testing tool 1000 can drive the impeller 14 to move along the force measuring direction, the first mounting assembly 200 has a first force measuring position and a second force measuring position relative to the force measuring assembly, the central axis of the impeller 14 can be overlapped with the force measuring direction when the first mounting assembly 200 is located at the first force measuring position, the central axis of the impeller 14 can be perpendicular to the force measuring direction when the first mounting assembly 200 is located at the second force measuring position, the second mounting assembly 300 for mounting the stator 16 and the central permanent magnet 18a can move along the force measuring direction, the second mounting assembly can apply force to the force measuring assembly 100 under the action of magnetic force, the force measuring assembly 100 can drive the second mounting assembly 300 to move along the force measuring direction relative to the first mounting assembly 200, so that the magnetic force applied to the impeller in the axial direction when the first mounting assembly 200 is located at the first force measuring position can be tested, for example, the axial attractive force between the stator 16 and the rotor magnet 14a of the impeller 14 and the axial repulsive force between the central permanent magnet 18a and the magnetic stiffness ring 14b of the impeller 14, and in the second force measurement position, the impeller 14 is driven by the first mounting assembly 200 to move in the force measurement direction, so that the second mounting assembly 300 can test the magnetic force applied to the impeller in the radial direction, for example, the radial repulsive force between the central permanent magnet 18a and the magnetic stiffness ring 14b of the impeller 14, in the second force measurement position, thereby enabling the magnetic force test tool 1000 to test various magnetic forces.

(2) The sliding table assembly 500 with the air bearing 530 is used for transferring magnetic force, so that friction loss is reduced, and the testing accuracy is improved.

(3) The concentricity of the stator 16, the impeller 14 and the central permanent magnet 18a can be improved by the calibration member 700, and the test accuracy can be improved.

The present invention is not limited to the above preferred embodiments, and any modification, equivalent replacement or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The utility model provides a magnetic force test fixture, can test the magnetic force between the stator of the pump body and the rotor magnet of impeller and the central permanent magnet of the pump body with the magnetic force between the rigidity magnetic ring of impeller, its characterized in that, magnetic force test fixture includes:

the force measuring assembly is provided with a force measuring direction;

the first mounting assembly is used for mounting the impeller, can drive the impeller to move along the force measuring direction, and has a first force measuring position and a second force measuring position relative to the force measuring assembly; when the first mounting assembly is located at the first force measuring position, the central axis of the impeller can be consistent with the force measuring direction, and when the first mounting assembly is located at the second force measuring position, the central axis of the impeller can be perpendicular to the force measuring direction;

the second mounting assembly is used for mounting the stator and the central permanent magnet, the second mounting assembly can move in the force measuring direction, the second mounting assembly can apply force to the force measuring assembly under the action of magnetic force, the force measuring assembly can also drive the second mounting assembly to move in the force measuring direction, and the force measuring assembly can measure the force value received by the second mounting assembly in the force measuring direction.

2. The magnetic force test tool of claim 1, further comprising an abutting member and a sliding table assembly, wherein the abutting member can abut against the force measuring assembly, the abutting member and the second mounting assembly are both mounted on the sliding table assembly, and the second mounting assembly drives the abutting member to abut against and push the force measuring assembly along the force measuring direction through the sliding table assembly under the action of the magnetic force; the force measuring assembly can pull the abutting connection piece to enable the sliding table assembly to drive the second mounting assembly to move.

3. A magnetic force test fixture according to claim 2, wherein the sliding table assembly includes a fixing member, a guide rail, an air bearing and a moving seat, the guide rail is fixedly connected to the fixing member, an extending direction of the guide rail is consistent with the force measuring direction, the air bearing is slidably sleeved on the guide rail, and the moving seat is fixedly connected to the air bearing; the abutting part and the second mounting assembly are mounted on the moving seat.

4. The magnetic force test tool of claim 2, further comprising a base, wherein the slide assembly and the force measuring assembly are mounted on the base, and the first force measuring position and the second force measuring position are disposed on the base and are close to the slide assembly.

5. The magnetic force testing tool of claim 1, further comprising an abutting member connected with the second mounting assembly, wherein the second mounting assembly pushes against the force measuring assembly through the abutting member, and the force measuring assembly pulls the second mounting assembly through the abutting member;

the butt joint piece has first butt joint portion and second butt joint portion, first butt joint portion with second butt joint portion follow dynamometry direction interval sets up, the dynamometry subassembly has the dynamometry head, the dynamometry head can measure the value that the second installation component received the power in the dynamometry direction, the dynamometry head set up in between first butt joint portion with the second butt joint portion, first butt joint portion with second butt joint portion all can with the dynamometry head butt, the dynamometry subassembly passes through butt joint piece pulling when the second installation component, first butt joint portion with the dynamometry head butt, when the second installation component passes through butt joint piece butt pushes away the dynamometry subassembly, second butt joint portion with the dynamometry head butt.

6. The magnetic force test tool of claim 1, wherein the force measuring assembly comprises a force meter, the force meter comprises a digital display device and a force measuring head connected with the digital display device and including a pressure sensor, and the force measuring head can measure a force value of the second mounting assembly in the force measuring direction and can transmit the value to the digital display device.

7. The magnetic testing tool of claim 1, further comprising a snap assembly capable of snapping the first mounting assembly and the second mounting assembly together to maintain the first mounting assembly and the second mounting assembly at a predetermined distance.

8. The magnetic test tool according to claim 1, wherein the first mounting assembly includes a first mounting seat, a position adjustment mechanism and a rotary table, the first mounting seat is fixedly connected to the position adjustment mechanism, the position adjustment mechanism can adjust the position of the first mounting seat in a three-dimensional space, the position adjustment mechanism can drive the first mounting seat to move along the force measuring direction, the rotary table is mounted on the first mounting seat, the rotary table can mount the impeller, and the rotary table can drive the impeller to rotate around the central axis of the impeller.

9. The magnetic force test tool of claim 1, wherein the second mounting assembly comprises a second mounting seat, a stator seat and a mounting piece, the second mounting seat can move relative to the first mounting assembly in the force measuring direction under the action of the magnetic force, the stator seat is used for mounting the stator, the stator seat is fixedly connected with the second mounting seat, the mounting piece is mounted on the stator seat, and the mounting piece is used for mounting the central permanent magnet.

10. The magnetic test tool of claim 1, wherein the first mounting assembly has a first torus, and a central axis of the first torus coincides with a central axis of the impeller mounted on the first mounting assembly; magnetic force test fixture still includes the calibration piece, the calibration piece can detachably install in on the second installation component, the calibration piece has the second anchor ring, the calibration piece install in when the second installation component is last, the central axis of second anchor ring with on the second installation component the central axis coincidence of stator, the second anchor ring can with the parallel butt of first anchor ring, just the second anchor ring with during the parallel butt of first anchor ring, the central axis of second anchor ring with the central axis coincidence of first anchor ring.

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