CN112494804B - Driving turntable and device suitable for magnetic driving centrifugal blood pump - Google Patents
Driving turntable and device suitable for magnetic driving centrifugal blood pump Download PDFInfo
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- CN112494804B CN112494804B CN202011321376.4A CN202011321376A CN112494804B CN 112494804 B CN112494804 B CN 112494804B CN 202011321376 A CN202011321376 A CN 202011321376A CN 112494804 B CN112494804 B CN 112494804B
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Abstract
The invention discloses a driving turntable suitable for a magnetic driving centrifugal blood pump, which comprises a pump head fixing device and a magnet driving device, wherein the pump head fixing device is used for fixing a shell of the centrifugal blood pump, so that the running stability of the centrifugal blood pump is ensured; the magnet driving device comprises a turntable structure, a magnet fixing ring and a magnet sealing cover, wherein the magnet fixing ring is used for limiting the radial displacement of the first magnet, the magnet sealing cover is used for limiting the axial displacement of the first magnet, and the magnet position is fixed through the design of the magnet fixing ring and the magnet sealing cover, so that the stability of the magnet in the high-speed rotation process is ensured, and the high stability of the operation of the magnetic driving centrifugal blood pump is further ensured; simultaneously, be provided with spacing subassembly on carousel structure, magnet solid fixed ring and the magnet closing cap, be convenient for assemble, improve assembly efficiency, still can guarantee carousel structure, magnet solid fixed ring and the stability of magnet closing cap in the rotatory in-process of high speed, and then guarantee the stability of first magnet.
Description
Technical Field
The invention belongs to the field of centrifugal blood pump design, and particularly relates to a driving turntable and a driving device suitable for a magnetic driving centrifugal blood pump.
Background
In extracorporeal circulation, centrifugal blood pumps replace the heart function, are responsible for draining blood from the body and providing centrifugal force to perfuse the blood back into the body, so the stability of the centrifugal blood pumps is particularly critical.
The centrifugal blood pump in the current market mainly comprises a magnetic drive centrifugal blood pump, and the magnetic drive centrifugal blood pump is very important in the design of a driving turntable, so that the design of the driving turntable can influence the power transmission efficiency and the running stability. In adverse events of the U.S. Food and Drug Administration (FDA), the unstable operation of blood pumps due to centrifugal rotor design occurs too many times. In addition, the NdFeB permanent magnet with the strongest magnetic force is needed to be used in the centrifugal turntable design, the permanent magnet is not firmly fixed in the installation process, and the posture of the permanent magnet can change in the rotation process, so that the centrifugal blood pump is unstable in operation.
In view of the foregoing, it is desirable to design a magnetically driven centrifugal blood pump drive turntable that operates stably.
Disclosure of Invention
The invention aims to provide a driving turntable suitable for a magnetic driving centrifugal blood pump, a processing technology and a processing device, and solves the problems that the magnetic driving centrifugal blood pump is unstable in operation and easy to make mistakes in the operation process.
In order to solve the problems, the technical scheme of the invention is as follows:
a driving turntable suitable for a magnetic driving centrifugal blood pump comprises a pump head fixing device and a magnet driving device;
the pump head fixing device is used for fixing the centrifugal blood pump;
the magnet driving device comprises a turntable structure, a magnet fixing ring and a magnet sealing cover, wherein a space for accommodating a first magnet is arranged on the turntable structure, the magnet fixing ring is used for limiting radial displacement of the first magnet, and the magnet sealing cover is used for limiting axial displacement of the first magnet;
the rotary table structure, the magnet fixing ring and the magnet sealing cover are provided with limiting components;
the turntable structure, the magnet securing ring, and the magnet cover cooperate with the first magnet such that an axis of an N-pole of the first magnet toward an S-pole is 90 degrees and/or non-90 degrees from an axis of rotation.
Preferably, a first boss matched with the first magnet is arranged at the position where the magnet fixing ring is contacted with the first magnet, and a second boss matched with the first magnet is arranged at the position where the magnet cover is contacted with the first magnet.
Preferably, the turntable structure is provided with a first clamping groove, the magnet fixing ring is provided with a second clamping groove, the magnet sealing cover is provided with clamping protrusions, the first clamping groove, the second clamping groove and the clamping protrusions jointly form the limiting assembly, and when the magnet driving device is assembled, the first clamping groove, the second clamping groove and the clamping protrusions are aligned and installed.
Preferably, the edge of the turntable structure is provided with a plurality of magnet mounting grooves with the number not less than that of the first magnets along the circumferential direction, and a plurality of the first magnets are correspondingly accommodated in the magnet mounting grooves respectively.
Preferably, the pump head fixing device further comprises a housing member, the pump head fixing device is mounted on the housing member, and the magnet driving device is accommodated in the housing member.
Preferably, the pump head fixing device comprises a pump head limiting part and an elastic constraint part, a plurality of grooves are formed in the periphery of the shell of the centrifugal blood pump, and an assembly body matched with the grooves is arranged on the pump head limiting part.
Preferably, the bearing assembly further comprises a hole clamp spring, wherein the hole clamp spring is mounted on the shell member and used for limiting axial movement between the bearing and the shell member.
Preferably, the axial clamping device further comprises a clamping spring for the shaft, wherein the clamping spring for the shaft is sleeved at the lower end of the main shaft and used for limiting axial movement between the main shaft and the bearing.
Based on the same inventive concept, the invention also provides a processing technology of the magnetic drive centrifugal blood pump, which comprises the following steps:
providing a rotary table structure, wherein a first clamping groove and a space for accommodating a first magnet are formed in the rotary table structure;
mounting the first magnet on the turntable structure;
a magnet fixing ring is coaxially sleeved on the turntable structure, a second clamping groove is formed in the turntable structure, the first clamping groove is aligned with the second clamping groove during assembly, and the magnet fixing ring is used for limiting radial displacement of the first magnet;
a magnet sealing cover is arranged on the magnet fixing ring and the turntable structure in a covering manner, clamping protrusions matched with the first clamping grooves and the second clamping grooves are machined on the magnet sealing cover, when the magnet sealing cover is assembled, the clamping protrusions are inserted into the first clamping grooves and the second clamping grooves in an aligned manner, the magnet sealing cover is used for limiting the axial displacement of the first magnet, and the turntable structure, the magnet fixing ring and the magnet sealing cover jointly form a magnet driving device;
adjusting the position of the first magnet so that the first magnet is stably fitted within the magnet driving device;
providing a housing member and coaxially mounting said magnet drive means within said housing member;
providing a pump head fixing device, wherein the pump head fixing device comprises a pump head limiting piece and an elastic constraint piece, the pump head limiting piece is arranged on the upper end face of the shell piece, an assembly body is arranged on the pump head limiting piece, and the magnet driving device, the shell piece and the pump head fixing device jointly form a driving turntable;
the centrifugal blood pump is installed, a plurality of grooves matched with the assembly body are formed in the outer shell of the centrifugal blood pump along the circumferential direction, during assembly, the assembly body is aligned with the grooves, the centrifugal blood pump is buckled into the driving turntable, the centrifugal blood pump is rotated to the limit position, and the elastic constraint piece is started to limit the outer shell of the centrifugal blood pump.
Based on the same inventive concept, the invention also provides a device which comprises the centrifugal blood pump and a power assembly, wherein the power assembly is the driving turntable.
By adopting the technical scheme, the invention has the following advantages and positive effects compared with the prior art:
1) The invention provides a driving turntable suitable for a magnetic driving centrifugal blood pump, which comprises a pump head fixing device and a magnet driving device, wherein the pump head fixing device is used for fixing a shell of the centrifugal blood pump, so that the running stability of the centrifugal blood pump is ensured; the magnet driving device comprises a turntable structure, a magnet fixing ring and a magnet sealing cover, wherein the magnet fixing ring and the magnet sealing cover are arranged on the turntable structure, the magnet fixing ring is used for limiting the radial displacement of the first magnet, the magnet sealing cover is used for limiting the axial displacement of the first magnet, and the magnet position is fixed through the design of the magnet fixing ring and the magnet sealing cover, so that the stability of the magnet in the high-speed rotation process is ensured, and the high stability of the operation of the magnetic driving centrifugal blood pump is further ensured; simultaneously, be provided with spacing subassembly on carousel structure, magnet solid fixed ring and the magnet closing cap, be convenient for assemble, improve assembly efficiency, still can guarantee carousel structure, magnet solid fixed ring and the stability of magnet closing cap in the rotatory in-process of high speed, and then guarantee the stability of first magnet.
Drawings
Fig. 1 is a first perspective three-dimensional view of a drive turntable suitable for a magnetically driven centrifugal blood pump according to an embodiment of the present invention;
FIG. 2 is a second perspective three-dimensional view of a drive rotor suitable for magnetically driving a centrifugal blood pump according to an embodiment of the present invention;
FIG. 3 is a cross-sectional view of a drive rotor suitable for use in a magnetically driven centrifugal blood pump according to an embodiment of the present invention;
fig. 4 is a schematic diagram of an internal structure of a driving turntable suitable for a magnetic driving centrifugal blood pump according to an embodiment of the present invention;
fig. 5a to 5c are flowcharts illustrating the installation of a centrifugal blood pump and a pump head fixing device suitable for a driving turntable of a magnetically driven centrifugal blood pump according to an embodiment of the present invention;
FIG. 6 is an exploded view of a drive rotor suitable for use in a magnetically driven centrifugal blood pump according to an embodiment of the present invention;
FIG. 7 is an exploded view of the magnet drive assembly of FIG. 6;
FIG. 8 is a schematic view of the magnet cover of FIG. 7;
FIG. 9 is a cross-sectional view of a magnetic drive apparatus for a drive rotor of a magnetically driven centrifugal blood pump according to an embodiment of the present invention;
FIG. 10 is a top view of a drive rotor suitable for magnetically driving a centrifugal blood pump according to an embodiment of the present invention;
FIG. 11 is a schematic diagram of a magnet suitable for use in a drive rotor of a magnetically driven centrifugal blood pump according to an embodiment of the present invention;
fig. 12 is a schematic structural diagram of a magnet suitable for a driving turntable of a magnetically driven centrifugal blood pump according to an embodiment of the present invention;
FIG. 13 is a schematic diagram illustrating an assembly of a driving turntable and a centrifugal blood pump suitable for a magnetically driven centrifugal blood pump according to an embodiment of the present invention;
FIG. 14 is a three-dimensional view of a drive rotor suitable for magnetically driving a centrifugal blood pump and a centrifugal blood pump assembly according to an embodiment of the present invention;
FIG. 15 is an exploded view of another alternative magnetic drive assembly for a drive rotor of a magnetically driven centrifugal blood pump according to an embodiment of the present invention;
FIG. 16 is a schematic view of the magnet cover of FIG. 15;
fig. 17 is a cross-sectional view of another drive rotor suitable for use in a magnetically driven centrifugal blood pump according to an embodiment of the present invention.
Reference numerals illustrate:
1: driving a turntable; 11: a housing member; 12: a pump head fixing device; 121: a pump head limiting member; 1211: an assembly body; 122: an elastic constraining member; 13: a magnet driving device; 131: a turntable structure; 1311: a turntable; 13111: a pump body mounting groove; 13112: a magnet mounting groove; 13113: a first clamping groove; 1312: a main shaft; 132: a magnet fixing ring; 1321: a second clamping groove; 1322: a first boss; 133: a magnet cover; 1331: a clamping protrusion; 1332: a second boss; 14: a first magnet; 15: a bearing; 16: clamp springs for holes; 17: clamping springs for shafts; 18: an isolation cover; 2: a centrifugal blood pump; 21: a second magnet; 22: a groove; 23: and a bump.
Detailed Description
The invention provides a driving turntable suitable for a magnetic driving centrifugal blood pump, a processing technology and a processing device, and the driving turntable and the processing technology and the processing device are further described in detail below with reference to the accompanying drawings and the specific embodiments. Advantages and features of the invention will become more apparent from the following description and from the claims.
Referring to fig. 1 to 14, the present embodiment provides a driving turntable 1 suitable for a magnetically driven centrifugal blood pump, comprising a housing member 11, a pump head fixing device 12 and a magnet driving device 13;
the housing part 11 serves as a support for the drive turntable 1;
the pump head fixing device 12 is fixedly arranged on the upper end surface of the shell member 11 and is used for fixing the shell of the centrifugal blood pump 2;
in this embodiment, referring to fig. 4, the pump head fixing device 12 includes a pump head limiting member 121 and an elastic constraint member 122, referring to fig. 6, in this embodiment, the pump head limiting member 121 is an annular member with a notch, the pump head limiting member 121 is coaxially and fixedly mounted on the upper end surface of the housing member 11, and in this embodiment, the pump head limiting member 121 is fixedly mounted on the upper end surface of the housing member 11 by five equally spaced screws, referring to fig. 6;
the magnet driving device 13 is accommodated in the housing member 11, and referring to fig. 7 to 10, the magnet driving device 13 includes a turntable structure 131, a magnet fixing ring 132, and a magnet cover 133;
the turntable structure 131 is coaxially and rotatably installed in the shell member 11, the turntable structure 131 comprises a turntable 1311 and a main shaft 1312 which are coaxially and fixedly connected up and down, the main shaft 1312 is positioned at one side far away from the pump head fixing device 12, the main shaft 1312 is connected with an external driving motor, and in the embodiment, a hole matched with an output shaft of the motor is formed in the lower end face of the main shaft 1312;
one end of the turntable 1311, which is close to the pump head fixing device 12, is provided with a pump body mounting groove coaxial with the turntable 1311 and used for accommodating the centrifugal blood pump 2, the outer edge of the pump body mounting groove is provided with a plurality of radially penetrating magnet mounting grooves 13112 along the circumferential direction, a plurality of pairs of first magnets 14 are respectively correspondingly accommodated in the magnet mounting grooves 13112, the layout diagram of the first magnets 14 is shown by referring to fig. 11, in the embodiment, the outer edge of the pump body mounting groove is provided with six pairs of magnet mounting grooves 13112 along the circumferential direction, six pairs of permanent magnets are respectively accommodated in the six pairs of magnet mounting grooves 13112, the polarities of the permanent magnets in adjacent pairs of magnet mounting grooves 13112 are opposite, the polarities of the permanent magnets in the same pair of magnet mounting grooves 13112 are the same, and only one permanent magnet can be placed in each pair of magnet mounting grooves 13112; as a preferred example, referring to fig. 12, in order to prevent the polarity of the permanent magnet from being placed incorrectly during installation, appropriate features may be added to identify the N-S magnetic pole of the magnet during the permanent magnet molding process, in this embodiment, N-S writing is made on the end face of the magnet during the magnet powder sintering process, and other structural features, such as single-dot and double-dot features, may be used to identify the N-S magnetic pole, in this embodiment, without limitation;
the magnet fixing ring 132 is coaxially sleeved at the upper end of the turntable 1311, the magnet fixing ring 132 is used as the outer wall of the magnet mounting groove 13112 to surround the magnet mounting groove 13112, the magnet fixing ring 132 is used for limiting the radial displacement of the first magnet 14, in this embodiment, the magnet fixing ring 132 is made of ferromagnetic materials, such as pure iron or carbon steel, and meanwhile, the magnet fixing ring 132 also plays a role in isolating the magnetic force of the first magnet 14 to avoid adsorbing peripheral ferromagnetic objects;
the magnet cover 133 is coaxially arranged on the turntable 1311 and wraps the magnet fixing ring 132, and the magnet cover 133 is used for limiting the axial displacement of the first magnet 14;
the turntable structure 131, the magnet fixing ring 132 and the magnet cover 133 are provided with limit components, as a preferred example, as shown in fig. 7, the outer side wall of the turntable 1311 is provided with a first clamping groove 13113, the outer side wall of the magnet fixing ring 132 is provided with a second clamping groove 1321, as shown in fig. 8, the inner side wall of the magnet cover 133 is provided with a clamping protrusion 1331, the arrangement of the first clamping groove 13113, the second clamping groove 1321 and the clamping protrusion 1331 is matched with the assembly of the turntable 1311, the magnet fixing ring 132 and the magnet cover 133, when the magnet fixing ring 132 is installed on the turntable 1311, the first clamping groove 13113 is aligned with the second clamping groove 13113 and the second clamping groove 1321 when the magnet cover 133 is arranged on the turntable 1311, and the clamping protrusion 1331 is inserted into the first clamping groove 13113 and the second clamping groove 1321, the assembly of the turntable 1311, the magnet fixing ring 132 and the magnet cover 133 is completed, and the magnet cover 133 is inserted into the magnet body 13112 from the center of the installation position of the magnet cover; for the installation sequence of the first magnet 14, the first magnet 14 may be placed in the magnet installation groove 13112, then the turntable structure 131, the magnet fixing ring 132 and the magnet cover 133 are assembled according to the above-mentioned assembly method, and finally the position of the first magnet 14 is adjusted so that the first magnet 14 is stably assembled in the magnet installation space formed by the turntable structure 131, the magnet fixing ring 132 and the magnet cover 133;
the first clamping groove 13113, the second clamping groove 1321 and the clamping protrusion 1331 form a limiting assembly together, so that the assembly is convenient, the assembly efficiency is improved, the stability of the turntable structure 131, the magnet fixing ring 132 and the magnet cover 133 in the high-speed rotation process can be ensured, the stability of the first magnet is further ensured, and the effect diagram of the magnet driving device 13 after assembly is shown in fig. 9 to 10;
as a preferred example, referring to fig. 6, the driving turntable 1 suitable for a magnetically driven centrifugal blood pump according to this embodiment further includes a bearing 15, the bearing 15 is sleeved on the main shaft 1312, and the turntable structure 131 is rotatably installed in the housing member 11 through the bearing 15; in this embodiment, the bearing 15 is a four-point angular contact bearing; in this embodiment, the driving turntable 1 further comprises a hole clamp spring 16, wherein the hole clamp spring 16 is mounted on the inner side wall of the housing member 11 and is used for limiting the axial displacement between the bearing 15 and the housing member 11; in this embodiment, the driving turntable 1 further includes a shaft clamp spring 17, where the shaft clamp spring 17 is sleeved on the lower end of the main shaft 1312, and is used to limit the axial displacement between the main shaft 1312 and the bearing 1312.
The specific implementation of the connection and fixation of the driving turntable 1 and the centrifugal blood pump 2 through the pump head fixing device 12 can be seen in fig. 5a, wherein four grooves 22 are formed in the outer shell of the centrifugal blood pump 2 along the circumferential direction, the grooves 22 are arc-shaped, four assemblies 1211 matched with the row grooves 22 are arranged on the inner wall of the pump head limiting piece 121, and the grooves 22 are mutually matched with the assemblies 1211 to play roles of installation, positioning and limiting; the elastic constraint piece 122 is telescopically installed on the side wall of the pump head limiting piece 121 along the radial direction, in this embodiment, the elastic constraint piece 122 is installed on the side wall of the pump head limiting piece 121 through threaded fit, in order to prevent the elastic constraint piece 122 from loosening, a thread compound can be smeared in the threaded hole, and the elastic constraint piece 122 is used for being matched with corresponding features on the shell structure of the centrifugal blood pump 2 to limit the rotation action of the blood pump shell;
as shown in fig. 5a to 5c, first, referring to fig. 5a, the elastic constraint member 122 is pulled away from the center of the circle, so that the groove 22 on the centrifugal blood pump 2 is aligned with the assembly 1211 on the pump head limiter 121; then, referring to fig. 5b, the centrifugal blood pump 2 is locked into the driving turntable 1; finally, referring to fig. 5c, the centrifugal blood pump 2 is rotated clockwise to the limit position, at this time, the groove 22 and the assembly 1211 are staggered, the centrifugal blood pump 2 is installed in place, the elastic constraint piece 122 is loosened, the elastic constraint piece 122 is matched with the corresponding feature on the blood pump shell, the position of the blood pump shell is fixed, the rotation of the blood pump shell is further limited in the operation process of the centrifugal blood pump, and referring to fig. 5c, the bump 23 is arranged on the blood pump shell, when the centrifugal blood pump 2 is rotated clockwise to the limit position, the elastic constraint piece 122 is loosened, the elastic constraint piece 122 is abutted against the bump 23, and the rotation of the centrifugal blood pump 2 is limited.
As a preferred example of this embodiment, referring to fig. 6, the driving turntable 1 suitable for a magnetic driving centrifugal blood pump provided in this embodiment further includes an isolation cover 18, where the isolation cover 18 is coaxially installed on a side of the magnet driving device 13 near the pump head fixing device 12, for shielding the magnet driving device 13, specifically, isolating the turntable 1311 in the magnet driving device 13 from the centrifugal blood pump 2, so as to prevent the static blood pump housing from making abnormal collision contact with the rotating magnet driving device 13 during normal operation, improve production efficiency, and ensure stability of operation of the centrifugal blood pump 2, and in this embodiment, the isolation cover 18 is made of a non-magnetic material, such as an aluminum alloy or a copper alloy or a plastic.
The assembly process of the driving turntable 1 suitable for a magnetic driving centrifugal blood pump provided in this embodiment can be described with reference to fig. 6, firstly, the four-point angular contact bearing 15 is placed in the housing member 11, the hole clamp spring 16 is clamped into the clamp spring groove in the housing member 11 by a tool and the clamp spring 1314 is clamped at the outer side of the bearing 15, then, the spindle 1312 of the assembled magnetic driving device 13 passes through the inner hole of the bearing 15, the shaft clamp spring 17 is clamped into the clamp spring groove on the spindle 1312 by a tool, the isolation cover 18 is installed into the matching groove of the housing member 11, the pump head limiting member 121 is fastened and connected with the housing member 11 by a screw, and finally, the elastic constraint member 122 is connected with the pump head limiting member 121 by a threaded fit.
The working principle of the driving turntable 1 suitable for magnetically driving a centrifugal blood pump provided in this embodiment is described below, and referring to fig. 13 to 14, the centrifugal blood pump and the driving turntable 1 are assembled first, the bottom of the centrifugal blood pump 2 is submerged in a pump body mounting groove, a blood pump housing is fixed by a pump head fixing device 12 to prevent rotation, a second magnet 21 matched with the first magnet 14 is circumferentially arranged at the bottom of the centrifugal blood pump 2, the spindle 1312 drives the turntable 1311 to rotate, the turntable 1311 drives the first magnet 14 to rotate, the second magnet 21 rotates under the magnetic force of the first magnet 14, and then an impeller in the centrifugal blood pump 2 is driven to rotate.
As a preferred example of the present embodiment, referring to fig. 15 to 17, the present embodiment further provides a driving turntable in which the axis of the N pole of the first magnet facing the S pole is not 90 degrees to the rotation axis, referring to fig. 17, the bottom surface of the magnet mounting groove 13111 is designed as a slope, the N-S pole of the first magnet 14 is not 90 degrees to the axis of the turntable structure 131, the first magnet 14 is obliquely placed in the magnet mounting groove 13111, in order to ensure that the magnet fixing device 132 is in surface contact with the first magnet 14 and the magnet cover 133 is in surface contact with the first magnet 14, so that the limit of the first magnet 14 is more firm, referring to fig. 15 to 16, the magnet fixing ring 132 is provided with a first boss 1322 matching with the first magnet 14 at the position where the magnet fixing ring 132 is in contact with the first magnet 14, and the first boss 1322 matching with the first magnet 14 is provided with a second boss 1332 matching with the first magnet 14 at the position where the magnet cover 133 is in contact with the first magnet 14 is shown in fig. 16, and the second boss 1332 is designed as a slope;
when the axis of the N pole of the first magnet facing the S pole is not 90 degrees with the rotation axis, the attractive force between the first magnet 14 on the turntable 1311 and the second magnet 21 inside the centrifugal blood pump 2 has a downward component force, so that the impeller in the centrifugal blood pump 2 can be ensured not to excessively move upwards due to the upward force generated by the rapid flow of the liquid when rotating, and the upper surface shell is prevented from being touched to generate friction.
The invention provides a driving turntable suitable for a magnetic driving centrifugal blood pump, which comprises a pump head fixing device 12 and a magnet driving device 13, wherein the pump head fixing device 12 is used for fixing a shell of the centrifugal blood pump 2, so that the running stability of the centrifugal blood pump 2 is ensured; the magnet driving device 13 comprises a turntable structure 131, a magnet fixing ring 132 and a magnet sealing cover 133, wherein the magnet fixing ring 132 and the magnet sealing cover 133 are arranged on the turntable structure 131, the magnet fixing ring 132 is used for limiting the radial displacement of the first magnet 14, the magnet sealing cover 133 is used for limiting the axial displacement of the first magnet 14, and the magnet position is fixed through the design of the magnet fixing ring 132 and the magnet sealing cover 133, so that the stability of the magnet in the high-speed rotation process is ensured, and the high stability of the operation of the magnetic driving centrifugal blood pump is further ensured; meanwhile, the limiting assemblies are arranged on the turntable structure 131, the magnet fixing ring 132 and the magnet sealing cover 133, so that the assembly is convenient, the assembly efficiency is improved, the stability of the turntable structure, the magnet fixing ring and the magnet sealing cover in the high-speed rotation process can be ensured, and the stability of the first magnet is further ensured.
As a preferable scheme of the invention, the invention also provides a processing technology of the magnetic drive centrifugal blood pump, which comprises the following steps:
providing a turntable structure 131, wherein a first clamping groove 13113 and a space for accommodating a first magnet 14 are processed on the turntable structure 131, in this embodiment, the turntable structure 131 comprises a turntable 1311 and a main shaft 1312, and a magnet mounting groove 13112 for accommodating the first magnet 14 is formed on the upper end surface of the turntable 1311;
mounting a first magnet 14 on a magnet mounting slot 13112 on the turntable structure 131;
a magnet fixing ring 132 is coaxially sleeved on the turntable structure 131, a second clamping groove 1321 is machined on the turntable structure 131, and when the turntable structure 131 is assembled, the first clamping groove 13113 is aligned with the second clamping groove 1321, and the magnet fixing ring 132 is used for limiting radial displacement of the first magnet 14;
a magnet cover 133 is covered on the magnet fixing ring 132 and the turntable structure 131, a clamping protrusion 1331 matched with the first clamping groove 13113 and the second clamping groove 1321 is processed on the magnet cover 133, and when the magnet driving device 13 is assembled, the clamping protrusions 1331 are arranged in the first clamping groove 13113 and the second clamping groove 1321 of the Ji Charu pair, the magnet cover 133 is used for limiting the axial displacement of the first magnet 14, and the turntable structure 131, the magnet fixing ring 132 and the magnet cover 133 jointly form the magnet driving device 13;
adjusting the position of the first magnet 14 so that the first magnet 14 is stably fitted in the magnet driving device 13, specifically so that the first magnet 14 is stably fitted in a magnet installation space constituted by the turntable structure 131, the magnet fixing ring 132, and the magnet cover 133 together;
providing a housing member 11 and coaxially mounting the magnet drive means 13 within the housing member 11;
providing a pump head fixing device 12, wherein the pump head fixing device 12 comprises a pump head limiting piece 121 and an elastic constraint piece 122, specifically, the elastic constraint piece 122 is a spring pin which is arranged on the side wall of the pump head limiting piece 121 in a telescopic way along the radial direction, the pump head limiting piece 121 is arranged on the upper end surface of the shell piece 11, an assembly 1211 is arranged on the pump head limiting piece 121, and the magnet driving device 13, the shell piece 11 and the pump head fixing device 12 jointly form a driving turntable 1;
the centrifugal blood pump 2 is installed, the shell of the centrifugal blood pump 2 is provided with a plurality of grooves 22 matched with the assembly 1211 along the circumferential direction, during assembly, the spring pin is pulled towards the direction away from the circle center, the assembly 1211 is aligned with the grooves 22, the centrifugal blood pump 2 is buckled into the driving turntable 1, then the centrifugal blood pump 2 is rotated to the limit position, at the moment, the assembly 1211 and the grooves 22 are staggered with each other, the spring pin is loosened, the spring pin is propped against the convex blocks 23 on the shell of the centrifugal blood pump 2, the shell of the centrifugal blood pump 2 is limited, and the shell of the centrifugal blood pump 2 is prevented from rotating.
As a preferred scheme of the invention, the invention also provides a device which comprises the centrifugal blood pump and a power assembly, wherein the power assembly is the driving turntable.
The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, it is within the scope of the appended claims and their equivalents to fall within the scope of the invention.
Claims (7)
1. The driving turntable suitable for the magnetic driving centrifugal blood pump is characterized by comprising a pump head fixing device, a magnet driving device and an isolation cover;
the pump head fixing device is used for fixing the centrifugal blood pump; the isolation cover is coaxially arranged on one side of the magnet driving device, which is close to the pump head fixing device, and is used for isolating the magnet driving device from the centrifugal blood pump;
the magnet driving device comprises a turntable structure, a magnet fixing ring and a magnet sealing cover, wherein a space for accommodating a first magnet is arranged on the turntable structure, the magnet fixing ring is used for limiting radial displacement of the first magnet, and the magnet sealing cover is used for limiting axial displacement of the first magnet;
the rotary table structure comprises a rotary table and a main shaft which are coaxially and fixedly connected up and down, one end of the rotary table, which is close to the pump head fixing device, is provided with a pump body mounting groove which is coaxial with the rotary table, the pump body mounting groove is used for accommodating the centrifugal blood pump, the outer edge of the pump body mounting groove is provided with a plurality of radial through magnet mounting grooves along the circumferential direction, a plurality of pairs of first magnets are correspondingly accommodated in the magnet mounting grooves respectively, and a pair of first magnets are arranged in each magnet mounting groove; the bottom surface of the magnet mounting groove is an inclined surface, a first boss matched with the first magnet is arranged at the position where the magnet fixing ring contacts with the first magnet, the first boss is of a slope design, a second boss matched with the first magnet is arranged at the position where the magnet sealing cover contacts with the first magnet, and the second boss is of a slope design, so that the magnet fixing ring is in surface contact with the first magnet and the magnet sealing cover is in surface contact with the first magnet; the axis of the N pole of the first magnet facing the S pole is not 90 degrees with the rotation axis, so that attractive force between the first magnet and the second magnet of the centrifugal blood pump has downward component force, and the upward excessive movement caused by the upward lifting force generated by the rapid flow of liquid can not be generated when the impeller in the centrifugal blood pump rotates;
the magnetic body driving device comprises a rotary disc, and is characterized in that a first clamping groove is formed in the outer side wall of the rotary disc, a second clamping groove is formed in the outer side wall of the magnetic body fixing ring, clamping protrusions are arranged on the inner side wall of the magnetic body sealing cover, the first clamping groove, the second clamping groove and the clamping protrusions jointly form a limiting assembly, and when the magnetic body driving device is assembled, the first clamping groove, the second clamping groove and the clamping protrusions are aligned and installed.
2. The drive rotor for a magnetically driven centrifugal blood pump according to claim 1, further comprising a housing member, said pump head fixture being mounted to said housing member, said magnet drive means being housed within said housing member.
3. The drive turntable suitable for a magnetically driven centrifugal blood pump according to claim 1 or 2, wherein the pump head fixing device comprises a pump head limiting part and an elastic constraint part, a plurality of grooves are formed in the periphery of a shell of the centrifugal blood pump, and an assembly body matched with the grooves is arranged on the pump head limiting part.
4. The drive rotor for a magnetically driven centrifugal blood pump according to claim 2, further comprising a hole clamp spring and a bearing, said hole clamp spring being mounted to said housing member for limiting axial play between said bearing and said housing member.
5. The drive turntable suitable for a magnetically driven centrifugal blood pump according to claim 1, further comprising a shaft snap spring and a bearing, wherein the shaft snap spring is sleeved at the lower end of the main shaft, and is used for limiting axial movement between the main shaft and the bearing.
6. The processing technology of the magnetic drive centrifugal blood pump is characterized by comprising the following steps of:
providing a rotary table structure, wherein a first clamping groove and a space for accommodating a first magnet are formed in the rotary table structure; the rotary table structure comprises a rotary table and a main shaft which are coaxially and fixedly connected up and down;
a magnet fixing ring is coaxially sleeved on the turntable structure, a first clamping groove is formed in the outer side wall of the turntable, a second clamping groove is formed in the outer side wall of the magnet fixing ring, the first clamping groove is aligned with the second clamping groove during assembly, and the magnet fixing ring is used for limiting radial displacement of the first magnet; a first boss matched with the first magnet is arranged at the contact position of the magnet fixing ring and the first magnet, and the first boss is of a slope design so as to ensure that the magnet fixing ring and the first magnet are in surface contact;
a magnet sealing cover is arranged on the magnet fixing ring and the turntable structure in a covering way, clamping protrusions matched with the first clamping grooves and the second clamping grooves are machined on the inner side wall of the magnet sealing cover, when the magnet sealing cover is assembled, the clamping protrusions are inserted into the first clamping grooves and the second clamping grooves in an aligned way, the magnet sealing cover is used for limiting the axial displacement of the first magnet, a second boss matched with the first magnet is arranged at the position where the magnet sealing cover contacts the first magnet, and the second boss is of a slope design so as to ensure that the magnet sealing cover contacts the first magnet in a surface manner;
the turntable structure, the magnet fixing ring and the magnet sealing cover jointly form a magnet driving device;
adjusting the position of the first magnet so that the first magnet is stably fitted within the magnet driving device;
providing a housing member and coaxially mounting said magnet drive means within said housing member;
providing a pump head fixing device, wherein one end of the rotary disc, which is close to the pump head fixing device, is provided with a pump body mounting groove coaxial with the rotary disc, the pump body mounting groove is used for accommodating the centrifugal blood pump, the outer edge of the pump body mounting groove is provided with a plurality of radially through magnet mounting grooves along the circumferential direction, a plurality of pairs of first magnets are correspondingly accommodated in the magnet mounting grooves respectively, and a pair of first magnets are arranged in each magnet mounting groove; the bottom surface of the magnet mounting groove is an inclined surface, the axis of the N pole of the first magnet facing the S pole is not 90 degrees with the rotation axis, and further attractive force between the first magnet and the second magnet of the centrifugal blood pump has downward component force, so that the impeller in the centrifugal blood pump cannot excessively move upwards due to the upward lifting force generated by the rapid flow of liquid when rotating; the pump head fixing device comprises a pump head limiting piece and an elastic constraint piece, wherein the pump head limiting piece is arranged on the upper end face of the shell piece, and an assembly body is arranged on the pump head limiting piece;
providing an isolation cover coaxially arranged on one side of the magnet driving device, which is close to the pump head fixing device, and used for isolating the magnet driving device from the centrifugal blood pump;
the magnet driving device, the shell piece, the isolation cover and the pump head fixing device jointly form a driving turntable;
the centrifugal blood pump is installed, a plurality of grooves matched with the assembly body are formed in the outer shell of the centrifugal blood pump along the circumferential direction, during assembly, the assembly body is aligned with the grooves, the centrifugal blood pump is buckled into the driving turntable, the centrifugal blood pump is rotated to the limit position, and the elastic constraint piece is started to limit the outer shell of the centrifugal blood pump.
7. A magnetically driven centrifugal blood pump device comprising a centrifugal blood pump and a power assembly, wherein the power assembly is a drive turntable according to any one of claims 1 to 5.
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| CN202011321376.4A CN112494804B (en) | 2020-11-23 | 2020-11-23 | Driving turntable and device suitable for magnetic driving centrifugal blood pump |
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| CN202011321376.4A CN112494804B (en) | 2020-11-23 | 2020-11-23 | Driving turntable and device suitable for magnetic driving centrifugal blood pump |
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| CN112494804B true CN112494804B (en) | 2023-09-19 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2023070566A1 (en) * | 2021-10-29 | 2023-05-04 | 广东德昌电机有限公司 | Distribution pump and cleaning device comprising distribution pump |
| CN115845244B (en) * | 2022-12-29 | 2023-12-01 | 心擎医疗（苏州）股份有限公司 | Magnetic suspension blood pump with impeller limit structure |
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| JP3582467B2 (en) * | 2000-09-14 | 2004-10-27 | 株式会社ジェイ・エム・エス | Turbo blood pump |
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| JP5932375B2 (en) * | 2012-02-06 | 2016-06-08 | メドテックハート株式会社 | Blood pump |
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