JP6357717B2 - Fluid pressure bearing pump system, fluid pressure bearing pump unit drive control device, and fluid pressure bearing pump unit drive control method - Google Patents

Description

  The present invention relates to a hydrodynamic bearing pump system including a hydrodynamic bearing pump in which a rotating impeller is supported in a non-contact manner by a hydrodynamic bearing, a drive controller for the hydrodynamic bearing pump unit, and a drive of the hydrodynamic bearing pump unit. It relates to a control method.

  The hydrodynamic bearing pump includes an impeller and a fixed body on which a hydrodynamic bearing portion that supports the impeller in a non-contact manner so as to be rotatable around a rotation axis is formed. The impeller is provided with a driven magnet formed of a permanent magnet. The pump driving device for rotating the impeller of the dynamic pressure bearing pump has a rotating magnetic field generating means for generating a rotating magnetic field rotating around the rotation axis while being magnetically coupled to the driven magnet of the dynamic pressure bearing pump. .

  When the impeller of the hydrodynamic bearing pump is rotated at a desired rotational speed, a rotating magnetic field is generated by the rotating magnetic field generating means, so that a drive control device for controlling the electric power supplied to the pump driving device is required. For example, the drive control device controls the electric power supplied to the pump drive device so that the rotation speed of the impeller corresponds to the operation amount of the operation end for designating the rotation speed of the impeller.

  When starting up a hydrodynamic bearing pump, etc., when changing the impeller to a desired rotational speed from a rotational speed of 0, the operator or the like operates the operating end to cope with the desired rotational speed from the operating amount of 0. Change to the manipulated amount.

By the way, the dynamic pressure bearing portion uses the dynamic pressure of the working fluid to float the impeller in the axial direction in which the rotation axis extends or in the radial direction perpendicular to the rotation axis.
In such a dynamic pressure bearing portion, since the impeller is in a stopped state of the rotational speed 0, the dynamic pressure of the working fluid does not act between the dynamic pressure bearing portion and the impeller, In contact. When the rotational speed of the impeller increases and the dynamic pressure of the working fluid between the impeller and the dynamic pressure bearing portion increases, the impeller floats from the dynamic pressure bearing portion and is supported by the dynamic pressure bearing portion in a non-contact manner. For this reason, depending on the operation of the operation end by the operator, the contact time between the impeller and the hydrodynamic bearing portion may be long. When the contact time between the impeller and the dynamic pressure bearing portion becomes long, the wear of the impeller and the dynamic pressure bearing portion proceeds, and the durability of the dynamic pressure bearing pump decreases. Further, when the hydrodynamic bearing pump is a pump that transports blood, for example, in the case of an artificial heart pump, if the contact time between the impeller and the hydrodynamic bearing portion becomes longer, The possibility of hemolysis and thrombus generation increases.

  Therefore, Patent Document 1 discloses that the impeller is a hydrodynamic bearing on the condition that the operation amount at the rotation speed operation end becomes the specific operation amount regardless of the change in the operation amount at the rotation speed operation end when the pump is started. A configuration is disclosed in which the rotational speed of the impeller increases at a predetermined rotational speed change rate up to the minimum floating rotational speed that is lifted from the section and supported in a non-contact state. For this reason, in the drive control device, it is possible to shorten the time during which the rotating impeller and the hydrodynamic bearing portion are in contact at the time of starting the pump.

Japanese Patent No. 5200237

However, even if the configuration described in Patent Document 1 is applied, there is a possibility that the rotational speed of the impeller of the hydrodynamic bearing pump does not increase to the minimum floating speed for some reason, such as a malfunction of the pump drive device, when the pump is started There is. In such a case, if the pump is started as it is, the time during which the rotating impeller and the hydrodynamic bearing are in contact with each other becomes longer, and the durability of the hydrodynamic bearing pump is lowered. .
The present invention has been made in view of the above circumstances, and is a fluid dynamic bearing pump system capable of improving the durability of the fluid dynamic bearing pump, a fluid pressure bearing pump unit drive control device, and a fluid dynamic bearing pump unit. An object is to provide a drive control method.

The hydrodynamic bearing pump system as one aspect according to the invention for achieving the above object is as follows:
A hydrodynamic bearing pump having an impeller and a fixed body formed with a hydrodynamic bearing portion that rotatably supports the impeller around a rotation axis , a suction port for sucking blood, and a discharge port for discharging blood ; A pump driving device that rotates an impeller of the dynamic pressure bearing pump according to supplied electric power, and a drive control device that operates the dynamic pressure bearing pump by controlling the pump driving device, The drive control device includes a rotation speed operation end for changing the rotation speed of the impeller and a specific operation predetermined from the operation amount 0 in a process in which the operation amount of the rotation speed operation end increases from the operation amount 0. In the initial operation section up to the amount, regardless of the operation amount change in the initial operation section, on the condition that the operation amount at the rotation speed operation end becomes the specific operation amount, the impeller is moved to the hydrodynamic bearing portion. Emerged from The power supplied to the pump drive device is controlled so that the rotational speed of the impeller is increased at a predetermined rotational speed change rate up to the minimum flying speed supported in a contact state, and the rotational speed operation end is operated. When the amount is equal to or greater than the specific operation amount, a power control unit that controls power supplied to the pump drive device so that the rotation speed of the impeller corresponds to the operation amount at the rotation speed operation end, and driving of the pump drive device A detection unit that detects a parameter indicating a state and the power control unit supply the pump driving device so that the rotational speed of the impeller increases at the predetermined rotational speed change rate to the minimum flying speed. In the process of controlling the power to be determined, it is determined whether or not the parameter indicating the driving state of the pump drive device detected by the detection unit is within a predetermined normal range, and is not within the normal range Judging, Bei Eteiru and a determination unit for instructing the stop of the power supply to the pump drive to the power control unit.

  In this dynamic pressure bearing pump system, when the rotational speed of the impeller is increased to the minimum flying speed at the time of starting the pump, the pump drive device parameter is not within a predetermined normal range when the parameter is not within a predetermined normal range. The power supply to the drive device is stopped. Therefore, in this dynamic pressure bearing pump system, it is prevented that the time during which the rotating impeller and the dynamic pressure bearing portion are in contact with each other is lengthened.

  Here, in the dynamic pressure bearing pump system, the drive control device restarts the pump drive device when it is recognized that the operation amount at the rotation speed operation end has returned to 0 after the pump drive device is stopped. You may make it startable. Thereby, the operator can confirm the pump restart.

In the hydrodynamic bearing pump system, the drive control device may limit the restart of the pump drive device when the pump drive device has been restarted a predetermined number of times.
Thereby, when a certain disadvantage arises when restart is excessively repeated, this can be prevented.

In the hydrodynamic bearing pump system, the drive control device may cause an abnormality that has occurred in the pump drive device when it is determined that the parameter indicating the drive state of the pump drive device is not within the normal range. When an input indicating that the pump has been canceled is made, the pump drive device may be restartable.
In this way, after the pump drive device is stopped, the pump cannot be restarted unless the abnormality that has occurred in the drive state of the pump drive device is resolved. Thereby, when the pump is restarted, it is possible to prevent the drive state from becoming abnormal again.

In the hydrodynamic bearing pump, after the determination unit determines that the parameter indicating the driving state of the pump driving device is within the normal range, and the rotational speed of the impeller reaches the minimum flying speed The power control unit, once the operation amount at the rotation speed operation end becomes equal to or greater than the specific operation amount, even if the operation amount becomes less than the specific operation amount, as long as the operation amount does not become the operation amount 0, You may control the electric power supplied to the said pump drive device so that the rotation speed of the said impeller may maintain the said floating minimum rotation speed.
In the hydrodynamic bearing pump system, the power control unit may rotate the impeller when the operation amount becomes zero after the operation amount at the rotation speed operation end once exceeds the specific operation amount. The electric power supplied to the pump drive device may be controlled so that the rotational speed decreases at a predetermined rotational speed change rate until the number becomes 0 from the floating minimum rotational speed.

  In this hydrodynamic bearing pump system, when the operation amount at the rotation speed operation end becomes 0 when the pump is stopped, a predetermined rotation speed change rate is reached until the rotation speed of the impeller becomes 0 from the minimum floating rotation speed. The rotation speed decreases. For this reason, in the hydrodynamic bearing pump system, the time during which the rotating impeller and the hydrodynamic bearing portion are in contact can be shortened when the pump is stopped.

  Further, in the hydrodynamic bearing pump system, the rotation speed operation end has a switch function for operating supply and disconnection of power to the pump drive device, and the position of the rotation speed operation end of the operation amount 0 is It is an off position, and the position of the rotation speed operation end of the specific operation amount may be an on position.

  In this hydrodynamic bearing pump system, the rotation speed operation end also serves as a switch function of the pump drive device. Therefore, once the dynamic pressure bearing pump is driven, the operation amount at the rotation speed operation end is halfway. The hydrodynamic bearing pump cannot be stopped, and the operation amount at the rotation speed operation end is not halfway at the time of activation.

  Further, in the above case, when the rotation speed operation end is moved from the on position to the off position side, the power control unit performs the rotation at a predetermined rotation speed change rate until the rotation speed of the impeller becomes zero. You may control the electric power supplied to the said pump drive device so that rotation speed may reduce.

  In this hydrodynamic bearing pump system, when the rotational speed operation end changes from the on position to the off position side when the pump is stopped, a predetermined rotational speed change rate is maintained until the rotational speed of the impeller becomes zero from the minimum floating rotational speed. The rotation speed decreases. For this reason, in this dynamic pressure bearing pump system, when the pump is stopped, the time during which the rotating impeller and the dynamic pressure bearing portion are in contact can be shortened.

  The dynamic pressure bearing pump system further includes a display unit that indicates a state of the dynamic pressure bearing pump, and the display unit includes the minimum floating speed or the minimum floating speed of the dynamic pressure bearing pump. The discharge amount may be displayed.

  In this dynamic pressure bearing pump system, the operator can recognize the minimum floating speed of the dynamic pressure bearing pump or the discharge amount of the dynamic pressure bearing pump corresponding to the minimum floating speed.

  The hydrodynamic bearing pump system further includes a housing in which the power control unit is housed and the rotation speed operation end is attached to the outside, and the housing includes the rotation speed operation end. The mark which shows the position of the said specific operation amount may be attached | subjected.

  In this hydrodynamic bearing pump system, the operator can recognize the position of the specific operation amount at the rotation speed operation end, that is, the position of the operation amount for setting the pump rotation speed to the minimum flying speed.

  The hydrodynamic bearing pump system further includes a cycle changing operation end for increasing or decreasing the rotation speed of the impeller at a predetermined cycle, and the power control unit has an operation amount of the rotation speed operation end. If the period change operation end is operated when the operation amount is equal to or greater than the specific operation amount, the power supplied to the pump drive device may be controlled so that the rotation speed of the impeller increases or decreases at a predetermined period. Good.

  In this hydrodynamic bearing pump system, the rotational speed of the impeller can be increased or decreased at a predetermined cycle. For this reason, for example, when bubbles or the like are accumulated in the pump casing, the bubbles can be efficiently discharged out of the pump casing by changing the rotation speed of the impeller.

  The hydrodynamic bearing pump system further includes a cycle changing operation end for increasing or decreasing the rotation speed of the impeller at a predetermined cycle, and the power control unit has an operation amount of the rotation speed operation end. When the period change operation end is operated when the operation amount is equal to or greater than the specific operation amount, the power supplied to the pump drive device is controlled so that the rotational speed of the impeller increases or decreases at a predetermined period. May be.

  Further, in the dynamic pressure bearing pump system, the impeller of the dynamic pressure bearing pump is provided with a driven magnet formed of a permanent magnet, and the pump drive device rotates the rotation while being magnetically coupled to the driven magnet. There may be provided a rotating magnetic field generating means for generating a rotating magnetic field rotating around an axis, and the drive control device may control the rotational speed of the impeller by controlling the rotational speed of the rotating magnetic field.

  In this case, the rotating magnetic field generating means includes a driving magnet formed of a permanent magnet, and a motor that rotates the driving magnet around the rotation axis while being magnetically coupled to the driven magnet. Also good.

  In this hydrodynamic bearing pump system, in order to rotate the impeller within the pump casing, a rotating shaft penetrating the casing becomes unnecessary. For this reason, in the dynamic pressure bearing pump system, when the dynamic pressure bearing pump is an artificial heart pump that conveys blood, it is possible to eliminate leakage of blood from the inside of the casing, and a portion where the rotating shaft penetrates the casing It is possible to eliminate blood hemolysis and thrombus formation.

  Further, in the hydrodynamic bearing pump system, the power control unit is configured such that when the operation amount at the rotation speed operation end is equal to or greater than the specific operation amount, the operation amount per unit time of the operation amount at the rotation speed operation end. When a certain operation amount change rate exceeds a predetermined value, the pump drive is performed so that the rotation speed change rate, which is the rotation speed change amount per unit time of the rotation speed of the rotating magnetic field, becomes a predetermined value. You may make it control the electric power supplied to an apparatus.

  In this hydrodynamic bearing pump system, it is possible to prevent the driven magnet from stepping out with respect to the rotation of the rotating magnetic field.

A drive control device for a hydrodynamic bearing pump unit as one aspect according to the invention for achieving the above-described object,
A hydrodynamic bearing pump having an impeller and a fixed body formed with a hydrodynamic bearing portion that rotatably supports the impeller around a rotation axis , a suction port for sucking blood, and a discharge port for discharging blood ; And a pump driving device for rotating the impeller of the hydrodynamic bearing pump in accordance with the supplied electric power. A drive control device for the hydrodynamic bearing pump unit comprising: a rotational speed for changing the rotational speed of the impeller In the process in which the operation amount at the operation end and the rotation speed operation end increases from the operation amount 0, in the initial operation interval from the operation amount 0 to a predetermined specific operation amount, the operation amount of the initial operation interval changes. Regardless, on the condition that the operation amount at the rotation speed operation end becomes the specific operation amount, the impeller is lifted from the hydrodynamic bearing portion and supported in advance in a non-contact state. Defined rotation speed variation The electric power supplied to the pump drive device is controlled so that the rotation speed of the impeller increases at a rate, and when the operation amount at the rotation speed operation end is equal to or greater than the specific operation amount, the operation amount at the rotation speed operation end is reduced. A power control unit that controls power supplied to the pump drive device so that the rotation speed of the impeller corresponds, a detection unit that detects a parameter indicating a drive state of the pump drive device, and the power control unit, The pump detected by the detector in the process of controlling the power supplied to the pump drive device so that the rotational speed of the impeller increases at the predetermined rotational speed change rate up to the minimum flying speed It is determined whether or not a parameter indicating a driving state of the driving device is within a predetermined normal range, and when it is determined that the parameter is not within the normal range, the power to the pump driving device is determined with respect to the power control unit. Bei Eteiru a determining unit for instructing the supply stop, the.

Moreover, the drive control method of the hydrodynamic bearing pump unit as one aspect according to the invention for achieving the above-described object,
A hydrodynamic bearing pump having an impeller and a dynamic pressure bearing portion that covers the impeller and supports the impeller around a rotation axis, a suction port for sucking blood, and a discharge port for discharging blood ; A pump driving device that rotates the impeller of the hydrodynamic bearing pump according to the supplied electric power, and drives the hydrodynamic bearing pump unit that rotates the impeller according to the operation amount of the rotational speed operation end. In the control method, in the process in which the operation amount at the rotation speed operation end increases from the operation amount 0, in the initial operation interval from the operation amount 0 to a predetermined specific operation amount, the operation amount change of the initial operation interval changes. Regardless, on the condition that the operation amount at the rotation speed operation end becomes the specific operation amount, the impeller is lifted from the hydrodynamic bearing portion and supported in advance in a non-contact state. Constant The power supplied to the pump drive device is controlled so that the rotation speed of the impeller increases at the determined rotation speed change rate, and when the operation amount of the rotation speed operation end is equal to or greater than the specific operation amount, the rotation speed operation end The electric power supplied to the pump drive device is controlled so that the rotational speed of the impeller corresponds to the operation amount of the impeller, and the rotational speed of the impeller is set at the predetermined rotational speed change rate up to the minimum flying speed. Whether the parameter indicating the driving state of the pump driving device detected by the detection unit is within a predetermined normal range in the process of controlling the power supplied to the pump driving device so as to increase. If it is determined that it is not within the normal range, the power control unit is instructed to stop power supply to the pump drive device .

  In this invention, when the parameter indicating the drive state of the pump drive device is not within a predetermined normal range in the process of increasing the rotational speed of the impeller to the minimum flying speed at the start of the pump, Stop power supply. For this reason, according to this invention, it can prevent that the time which the rotating impeller and the hydrodynamic bearing part contact is prolonged, and can improve the durability of a hydrodynamic bearing pump.

It is a block diagram of the dynamic pressure bearing pump system in 1st embodiment which concerns on this invention. It is a top view of the fluid dynamic bearing pump unit in the first embodiment according to the present invention. FIG. 3 is a view taken along arrow III in FIG. 2. It is the IV-IV sectional view taken on the line in FIG. It is sectional drawing of the dynamic pressure bearing pump in 1st embodiment which concerns on this invention. It is the schematic diagram which drew typically the cross section of the hydrodynamic bearing pump unit in 1st embodiment which concerns on this invention. It is a front view of the drive control device in a first embodiment concerning the present invention. It is a graph which shows the relationship between the operation amount of the rotation speed operation volume in 1st embodiment which concerns on this invention, and the rotation speed of the impeller of a dynamic pressure bearing pump, or a motor. It is a graph which shows the change of the rotation speed with respect to the time passage between the rotation speed 0 and the lowest levitation rotation speed in the first embodiment according to the present invention. It is a graph which shows the relationship between the operation amount change rate and rotation speed change rate in 1st embodiment which concerns on this invention. It is a graph which shows the rotation speed change accompanying time progress when the period change switch in 1st embodiment which concerns on this invention is operated. It is a figure which shows the flow of control by the drive control apparatus in 1st embodiment which concerns on this invention. It is a figure which shows the flow of control by the drive control apparatus in 2nd embodiment which concerns on this invention. It is a figure which shows the flow of control by the drive control apparatus in 3rd embodiment which concerns on this invention. It is a block diagram of the hydrodynamic bearing pump system in the modification of each embodiment which concerns on this invention. It is a block diagram which shows the structure of the rotation speed operation volume in the modification of each embodiment which concerns on this invention. It is a graph which shows the relationship between the operation amount of the rotation speed operation volume in the modification of each embodiment which concerns on this invention, and the rotation speed of the impeller of a dynamic pressure bearing pump, or a motor. It is sectional drawing which shows the structure of the hydrodynamic bearing pump in the modification of each embodiment which concerns on this invention. It is a figure which shows the other example of a rotation speed operation end.

  Hereinafter, embodiments of a hydrodynamic bearing pump system according to the present invention will be described in detail with reference to the drawings.

"First embodiment"
First, a first embodiment of a hydrodynamic bearing pump system will be described with reference to FIGS.

  As shown in FIG. 1, the hydrodynamic bearing pump system of the present embodiment includes a hydrodynamic bearing pump 100, a pump driving device 200 that drives the hydrodynamic bearing pump 100, and a hydrodynamic bearing pump 100 using the pump driving device 200. And a drive control device 300 that controls the driving of the motor. In the present embodiment, the hydrodynamic bearing pump 100 and the pump driving device 200 constitute the hydrodynamic bearing pump unit 1.

  The hydrodynamic bearing pump 100 is an artificial heart pump that transports blood. As shown in FIG. 5, the hydrodynamic bearing pump 100 includes a sealed impeller 10 and a pump casing 60 that covers the impeller 10 so as to be rotatable about the rotation axis A.

  In the pump casing 60, a discharge port (see FIGS. 2 and 3) 7 for discharging blood is formed, and a suction port 6 for sucking blood is formed on an extension line of the rotation axis A. . In the following, in the axial direction Da in which the rotation axis A extends, the suction port 6 side of the pump casing 60 is the front side, and the opposite side is the rear side. In the radial direction Dr perpendicular to the rotation axis A, the direction side approaching the rotation axis A is the inside, and the direction side moving away from the rotation axis A is the outside.

  The impeller 10 includes a plurality of blades 11 provided around the rotation axis A, a front shroud 20 that covers the front side of the plurality of blades 11, and a rear shroud 40 that covers the rear side of the plurality of blades 11. ing. As described above, the impeller 10 forms a sealed impeller by covering the front and rear of the plurality of blades 11 with the front shroud 20 and the rear shroud 40. The plurality of blades 11, the front shroud 20, and the rear shroud 40 of the impeller 10 are respectively integrally molded products made of resin, and these are joined to each other by an adhesive.

  The front shroud 20 has a cylindrical shape with the rotation axis A as the center, and an inlet cylinder portion 21 that forms an impeller inlet 12 whose front opening in the axial direction Da faces the suction port 6 of the pump casing 60, and an inlet cylinder portion 21 and a front side plate portion 31 that covers the front side of the plurality of blades 11. The rear shroud 40 includes a rear plate portion 41 that covers the rear sides of the plurality of blades 11, and a columnar shaft portion 51 that is provided at the rear end of the rear plate portion 41 and that has a rotation axis A as a center. ing.

  As for the front side plate part 31 of the front shroud 20 and the rear side plate part 41 of the rear shroud 40, the shapes seen from the axial direction Da are both circular around the rotation axis A. The front side plate portion 31 and the rear side plate portion 41 are separated in the axial direction Da. A plurality of blades 11 are fixed between the front side plate portion 31 and the rear side plate portion 41. The outer edge in the radial direction Dr between the front side plate portion 31 and the rear side plate portion 41 forms the impeller outlet 13. An impeller inner flow passage Pr is formed in the inlet cylinder portion 21 and between the front plate portion 31 and the rear plate portion 41 and between the plurality of blades 11.

  The shaft portion 51 of the rear shroud 40 has a through-hole 56 that passes through the rotation axis A in the axial direction Da and communicates between the rear end surface 53 of the shaft portion 51 and the pump casing 60 and the flow path Pr in the impeller. Is formed. A plurality of driven magnets 19 formed of permanent magnets are embedded in the shaft portion 51 at a position between the outer peripheral surface 52 and the inner peripheral surface of the through hole 56.

  The pump casing 60 includes a pre-pump casing 61 that covers the front shroud 20 of the impeller 10 and a post-pump casing 81 that covers the rear shroud 40 of the impeller 10.

  The pump front casing 61 includes a substantially cylindrical suction hose connection pipe portion 62 to which a suction hose is connected, and a diameter expansion pipe having an inner diameter gradually increased from the rear end toward the rear side of the suction hose connection pipe portion 62. An inner peripheral surface (front dynamic pressure bearing surface, dynamic pressure bearing portion) 68 provided at the rear end of the portion 65 and the enlarged diameter pipe portion 65 and facing the outer peripheral surface 22 of the inlet cylinder portion 21 of the front shroud 20 with a space therebetween. And a front casing main body 71 provided at the rear end of the front bearing forming portion 67 and covering the front plate portion 31 of the front shroud 20.

  The front end of the suction hose connection pipe portion 62 is open, and this opening forms the suction port 6 of the pump casing 60.

  The front casing main body portion 71 extends outward from the rear end of the front bearing forming portion 67 and faces the front surface 32 of the front side plate portion 31 of the front shroud 20 with a spacing in the axial direction Da with a space therebetween. And a front main body cylinder portion 75 that has a substantially cylindrical shape around the rotation axis A and extends rearward from the outer peripheral edge of the front facing portion 72. The shape of the inner peripheral surface 76 of the front main body cylinder portion 75 in a cross section perpendicular to the rotation axis A is a volute shape. The inner peripheral surface 76 of the front main body cylinder portion 75 faces the outer peripheral edge of the front side plate portion 31 of the front shroud 20 with a space therebetween.

  The pump rear casing 81 is provided at the rear end of the front casing main body 71 and covers the rear plate part 41 of the rear shroud 40, and the shaft 51 of the rear shroud 40 provided on the rear casing main body 91. A rear bearing forming portion 82 formed with an inner peripheral surface 83 facing the outer peripheral surface 52 with a space therebetween, and a distance between the shaft portion 51 of the rear shroud 40 and the axial direction Da provided at the rear end of the rear bearing forming portion 82. And a flat plate-shaped rear wall plate portion 85 facing each other.

  The rear casing main body 91 has a substantially cylindrical shape centering on the rotation axis A, and extends from the rear end of the front casing main body 71 to the rear side, and from the rear end of the rear main body cylindrical portion 92 to the inner side. A flat plate ring-shaped rear surface facing portion 95 facing the rear surface 42 of the rear shroud 40 and spaced apart in the axial direction Da. The inner peripheral surface 93 of the rear main body cylinder portion 92 is formed so as to be continuous with the inner peripheral surface 76 of the front main body cylinder portion 75. A rear bearing forming portion 82 is provided on the inner edge of the rear surface facing portion 95 so as to extend rearward therefrom.

  As shown in FIGS. 2 and 3, the pump casing 60 has a substantially cylindrical discharge hose connection pipe portion 9 to which the discharge hose is connected. The axis Ad of the substantially cylindrical discharge hose connecting pipe portion 9 is parallel to a plane perpendicular to the rotation axis A. Further, the discharge hose connecting pipe portion 9 is divided into two in the front-rear direction on a plane passing through the axis Ad. One of the two divided discharge hose connection pipe portions 9 is provided as a connection pipe front split portion 78 in the front main body cylinder portion 75 of the pump front casing 61. The other of the two divided discharge hose connection pipe portions 9 is provided in the rear main body cylinder portion 92 of the post-pump casing 81 as a connection pipe rear split portion 98. The outer end of the discharge hose connection pipe portion 9 is open, and this opening forms the discharge port 7 of the pump casing 60.

  Each of the pre-pump casing 61 and the post-pump casing 81 is an integrally molded product made of resin. The pre-pump casing 61 and the post-pump casing 81 are joined by an adhesive.

  As shown in FIGS. 4 and 6, the pump driving device 200 includes a motor 210 having a rotating output shaft 211, a cup 220 having a bottomed cylindrical shape, and a plurality of pins fixed to the inner peripheral side of the cup 220. A drive magnet 219, a drive device casing 230 that covers the motor 210 and the cup 220, and a lock member 250 for maintaining the mounting of the hydrodynamic bearing pump 100 mounted on the drive device casing 230 are provided.

  The cup 220 is made of, for example, carbon steel such as SS400, which is a ferromagnetic material, and serves as a yoke for the plurality of drive magnets 219. The cup 220 includes a cylindrical cup cylinder portion 221 and a flat plate motor connection portion 225 that closes one opening of the cup cylinder portion 221. An output shaft 211 of the motor 210 is fixed on the motor connecting portion 225 and on the extension line of the shaft of the cup cylindrical portion 221. A plurality of drive magnets 219 are fixed to the inner peripheral side of the cup cylindrical portion 221 as described above. The drive magnet 219 is a permanent magnet, for example, an Nd (neodymium) magnet.

  The inner diameter of the cup cylindrical portion 221 is larger than the outer diameter of the rear bearing forming portion 82 of the post-pump casing 81. Further, the length twice the distance in the radial direction from the axis of the cup cylindrical portion 221 to the inner surface of each drive magnet 219 (hereinafter referred to as a magnet arrangement diameter) is outside the rear bearing forming portion 82 of the post-pump casing 81. It is larger than the diameter.

  The drive device casing 230 includes a bottomed cylindrical casing body 231 and a cap 241 that closes the opening of the casing body 231.

  The casing body 231 is made of, for example, an Al (aluminum) alloy that is a paramagnetic material. The casing main body 231 has a cylindrical casing cylindrical portion 232 having an inner diameter larger than the outer diameter of the cup 220 and the outer diameter of the motor 210, and a flat plate-shaped casing bottom portion 235 that closes one opening of the casing cylindrical portion 232. doing.

  The motor 210 is placed in the casing main body 231 and is fixed to the casing bottom 235 with screws 236. A part of the outer periphery of the casing cylindrical portion 232 has a concavo-convex shape in the radial direction Dr, and the convex portion forms the radiation fin 233. Further, a power cable plate 234 for passing a power cable of the motor 210 is formed in another part of the casing cylindrical portion 232.

  The cap 241 is formed of, for example, a resin such as PEEK (Poly Ether Ether Ketone) resin. The cap 241 has a bottomed cylindrical shape, a pump fitting portion 242 into which the rear bearing forming portion 82 and the rear wall plate portion 85 are fitted inside, and a bottomed cylindrical pump fitting portion. A pump receiving portion 244 that extends outward from the opening edge of 242 and forms a flat ring shape, and an engaging portion 246 that is formed on the outer peripheral edge of the pump receiving portion 244 and engages with the opening edge of the casing body 231. Yes.

  The inner diameter of the bottomed cylindrical pump fitting portion 242 is substantially the same as the outer diameter of the rear bearing forming portion 82 of the pump casing 60. Therefore, the rear bearing forming portion 82 of the pump casing 60 can be fitted into the pump fitting portion 242 of the cap 241. Further, the pump fitting portion 242 has an outer diameter smaller than the inner diameter of the cup cylindrical portion 221 and the above-described magnet arrangement diameter, and the driving magnet fixed to the cup 220 in the bottomed cylindrical cup 220. 219 enters without contact.

  The rear bearing forming portion 82 of the pump casing 60 is fitted into the pump fitting portion 242 of the cap 241 of the driving device casing 230, and the dynamic pressure bearing pump 100 is attached to the pump driving device 200. Then, the driven magnet 19 embedded in the shaft portion 51 of the hydrodynamic bearing pump 100 and the driving magnet 219 fixed to the cup 220 of the pump driving device 200 face each other in a non-contact manner in the radial direction Dr. Both magnets are magnetically coupled. When the motor 210 is driven in this state and the drive magnet 219 rotates together with the output shaft 211, the driven magnet 19 of the hydrodynamic bearing pump 100 that is magnetically coupled to the drive magnet 219 also moves with the rotation of the drive magnet 219. And rotate around the rotation axis A. Therefore, when the drive magnet 219 of the pump drive device 200 rotates, the impeller 10 in which the driven magnet 19 is embedded together with the driven magnet 19 also rotates around the rotation axis A in synchronization with the rotation of the drive magnet 219. To do.

  As shown in FIG. 1, the drive control device 300 includes a computer (power control unit, determination unit) 310 that executes various arithmetic processes, a display 320 that displays various types of information, and a power supply circuit 330 that supplies power to each unit. A power conversion circuit (power control unit) 335 that converts the power from the power supply circuit 330 into power according to an instruction from the computer 310 and supplies the power to the motor 210 of the pump driving device 200, and a housing 340 that houses them. A power switch 355 for activating the drive control device 300, a rotation speed volume (rotation speed operation end) 350 for changing the rotation speed of the impeller 10, and a predetermined cycle for the rotation speed of the impeller 10. And a period change switch (period change operation end) 356 for increasing and decreasing at the same time.

  The rotational speed volume 350 is a variable resistor, and includes a volume knob 351, a conductor 352 attached to the volume knob 351, and a resistor 353 in contact with the conductor 352. The voltage between the conductor 352 and the resistor 353 changes according to the operation of the volume knob 351. The voltage between the conductor 352 that moves in response to the operation of the volume knob 351 and the resistor 353 is input to the computer 310. In the present embodiment, the operation of the volume knob 351 is to rotate the volume knob 351 as shown in FIG. Therefore, the operation amount of the rotation speed volume 350 is the rotation amount of the volume knob 351. In the housing 340 provided with the volume knob 351, a zero operation amount mark 341 in which the operation amount of the rotation number volume 350 indicates an operation amount of 0, and a specific operation amount S in which the operation amount of the rotation number volume 350 is predetermined. An S manipulated variable mark 342 is attached.

  Both the power switch 355 and the period change switch 356 are electrically connected to the computer 310. For this reason, when these switches 355 and 356 are operated, the fact is input to the computer 310.

  Further, as described in detail later, the drive control device 300 controls the driving of the hydrodynamic bearing pump 100 by the pump drive device 200, so that the computer 310 supplies the motor 210 with the power supplied from the power conversion circuit 335 to the motor 210. Monitor the driving status of For this reason, the power conversion circuit 335 is provided with a detection circuit (not shown) that detects the current and voltage supplied to the motor 210. The motor 210 is provided with a sensor (detection unit) 339 that detects a magnetic pulse generated with the rotation of the motor 210 in order to detect the rotation speed of the motor 210.

  As described above, the rotation of the impeller 10 of the hydrodynamic bearing pump 100 is synchronized with the rotation of the drive magnet 219, that is, the rotation of the output shaft 211 of the motor 210. For this reason, when controlling the rotation speed of the impeller 10, the rotation speed of the output shaft 211 of the motor 210 may be controlled. For this reason, the drive control device 300 controls the motor rotation speed by controlling the power supplied from the power conversion circuit 335 to the motor 210.

  As a motor rotation speed control method, for a DC motor, for example, a method for controlling the voltage of DC power, for an AC motor, for example, a method for controlling the voltage of AC power, a method for controlling the frequency of AC power, etc. There are various methods depending on the type.

  For example, when the motor 210 is an AC motor and the motor rotation speed is controlled by controlling the frequency of the AC voltage supplied to the motor 210, the computer 310 basically has a frequency corresponding to the operation amount of the rotation volume 350. A control signal indicating the value of is sent to the power conversion circuit 335. The power conversion circuit 335 converts AC power from the power supply circuit 330 into AC power having a frequency indicated by the control signal, and supplies the AC power to the motor 210. As a result, the output shaft 211 of the motor 210 basically rotates at a rotational speed corresponding to the operation amount of the rotational speed volume 350.

  In the present embodiment, the computer 310 and the power conversion circuit 335 constitute a power control unit. Further, the processing by the computer 310 described below is executed by the CPU of the computer 310 in accordance with a program installed in advance in the memory of the computer 310.

  Next, the operation of the hydrodynamic bearing pump system described above will be described.

  First, the general operation of the hydrodynamic bearing pump system and the general operation of the system based on this operation will be described.

  When driving the dynamic pressure bearing pump 100, the operator first connects the suction hose to the suction hose connection pipe portion 62 of the dynamic pressure bearing pump 100 and connects the discharge hose to the discharge hose connection pipe portion 9.

  Next, the rear bearing forming portion 82 of the pump casing 60 is fitted into the pump fitting portion 242 of the cap 241 of the driving device casing 230, and the dynamic pressure bearing pump 100 is attached to the pump driving device 200. At this time, the rear surface facing portion 95 of the pump casing 60 and the pump receiving portion 244 of the cap 241 are in contact with each other. Next, the pump casing 60 is fixed to the drive device casing 230 by the lock member 250.

  In this state, the hydrodynamic bearing pump unit 1 includes a driven magnet 19 embedded in the shaft portion 51 of the hydrodynamic bearing pump 100 and a drive magnet 219 fixed to the cup 220 of the pump drive device 200. In the radial direction Dr, they face each other in a non-contact state and are magnetically coupled. Further, the output shaft 211 of the motor 210 is located on an extension line of the rotational axis A of the hydrodynamic bearing pump 100.

  In the above description, the dynamic pressure bearing pump 100 is attached to the pump driving device 200 after the suction hose and the discharge hose are connected. However, even after the dynamic pressure bearing pump 100 is attached, the suction hose and the discharge hose are connected. Good.

  Next, the power switch 355 of the drive control device 300 is operated to activate the drive control device 300. At this time, power from the power supply circuit 330 is supplied to the computer 310 and the display 320 of the drive control device 300, and these are activated. Then, the computer 310 sends an image signal to the display 320 and causes the display 320 to display contents corresponding to the image signal. For example, as shown in FIG. 7, the display 320 has a current pump discharge flow rate 321, a current pump rotational speed (the rotational speed of the impeller 10) 322, a pump operation state 323, a pump maximum rotational speed 324, and a pump maximum rotational speed. A pump maximum flow rate 325 that is a discharge flow rate at several hours, a pump minimum rotation number 326, a pump minimum flow rate 327 that is a discharge flow rate at the minimum pump rotation rate, and the like are displayed. At this time, since the hydrodynamic bearing pump 100 is not driven, the display 320 displays 0 (L / min) as the current pump discharge flow rate, 0 (RPM) as the pump rotation speed, For example, “stop” is displayed.

  Next, the operator operates the rotation speed volume 350 of the drive control device 300. The rotational speed volume 350 also serves as a switch function related to the supply of electric power to the pump drive device 200, that is, a drive switch function of the dynamic pressure bearing pump 100. By operating the rotational speed volume 350, the pump drive device 200 is operated. Electric power is supplied to the motor 210 and the motor 210 is driven.

  When the motor 210 of the pump driving device 200 is driven and the output shaft 211 of the motor 210 rotates, the cup 220 fixed to the output shaft 211 and the plurality of drive magnets 219 fixed to the cup 220 are hydrodynamic bearings. It rotates around the rotation axis A of the pump 100. When the drive magnet 219 of the pump drive device 200 rotates, the driven magnet 19 of the hydrodynamic bearing pump 100 that is magnetically coupled to the drive magnet 219 also rotates with the rotation axis A as the drive magnet 219 rotates. Rotate around. The driven magnet 19 of the hydrodynamic bearing pump 100 is embedded in the shaft portion 51 of the impeller 10. For this reason, when the drive magnet 219 of the pump drive device 200 rotates, the impeller 10 and the driven magnet 19 rotate around the rotation axis A in the pump casing 60.

  When the impeller 10 starts to rotate in the pump casing 60, blood is sucked into the pump casing 60 from the suction port 6 of the pump casing 60 as shown in FIG. The blood sucked into the pump casing 60 enters the impeller flow path Pr in the impeller 10 from the impeller inlet 12.

  The blood that has entered the impeller channel Pr is subjected to centrifugal force from the rotating blades 11 and flows out from the impeller outlet 13, and then is discharged from the discharge port 7 of the pump casing 60.

  A part of the blood flowing out from the impeller outlet 13 is formed between the inner surface 73 of the front facing portion 72 of the front casing 61 of the pump and the front surface 32 of the front plate portion 31 of the front shroud 20 to form the front bearing of the front casing 61 of the pump. It returns between the inner peripheral surface 68 of the portion 67 and the outer peripheral surface 22 of the inlet cylinder portion 21 of the front shroud 20 and returns to the inside of the expanded pipe portion 65 of the pump front casing 61. Then, it enters the impeller inner flow path Pr again from the impeller inlet 12.

  Further, another part of the blood that has flowed out of the impeller outlet 13 flows from between the inner surface 96 of the rear surface facing portion 95 of the rear casing 81 and the rear surface 42 of the rear plate portion 41 of the rear shroud 40. Between the inner peripheral surface (rear dynamic pressure bearing surface, dynamic pressure bearing portion) 83 of the rear bearing forming portion 82 and the outer peripheral surface 52 of the shaft portion 51 of the rear shroud 40, the rear wall plate portion 85 of the pump rear casing 81 is provided. Between the inner surface 86 and the rear end surface 53 of the shaft portion 51 of the rear shroud 40, and further through the through hole 56 of the rear shroud 40, the flow returns to the impeller inner flow path Pr.

  The bus on the inner peripheral surface 68 of the front bearing forming portion 67 of the front casing 61 of the pump and the bus on the outer peripheral surface 22 of the inlet cylinder portion 21 of the front shroud 20 are parallel to each other. In other words, the distance between the inner peripheral surface 68 of the front bearing forming portion 67 and the outer peripheral surface 22 of the inlet tube portion 21 is constant in the axial direction Da. Moreover, the cross-sectional shape perpendicular | vertical with respect to the rotating shaft A of the inner peripheral surface 68 of the front bearing formation part 67 of the pump front casing 61 and the outer peripheral surface 22 of the inlet cylinder part 21 of the front shroud 20 is a circle. For this reason, the inner peripheral surface 68 of the front bearing forming portion 67 and the outer peripheral surface 22 of the inlet tube portion 21 form a dynamic pressure radial bearing surface, respectively, and blood flowing between both surfaces 68 and 22 functions as a lubricating fluid. . Therefore, the impeller 10 is supported by the pump casing 60 so that the portion of the inlet cylinder portion 21 of the impeller 10 can rotate in a non-contact manner in the radial direction Dr. When the rotational speed of the impeller 10 is low, such as when the impeller 10 starts rotating, the inner peripheral surface 68 of the front bearing forming portion 67 (hereinafter, this inner peripheral surface 68 is referred to as the front dynamic pressure bearing surface 68). A part and a part of the outer peripheral surface 22 of the inlet cylinder part 21 are in contact with each other, and when the rotational speed of the impeller 10 exceeds a predetermined rotational speed, the dynamic pressure of the fluid acting between the both surfaces 68 and 22 As described above, the inlet cylinder portion 21 of the impeller 10 is supported by the front dynamic pressure bearing surface 68 so as to be rotatable in a non-contact manner.

  Further, the bus bar of the inner peripheral surface 83 of the rear bearing forming portion 82 of the rear casing 81 of the pump and the bus bar of the outer peripheral surface 52 of the shaft portion 51 of the rear shroud 40 are parallel to each other. In other words, the distance between the inner peripheral surface 83 of the rear bearing forming portion 82 and the outer peripheral surface 52 of the shaft portion 51 is constant in the axial direction Da. Further, the cross-sectional shapes perpendicular to the rotational axis A of the inner peripheral surface 83 of the rear bearing forming portion 82 of the rear casing 81 and the outer peripheral surface 52 of the shaft portion 51 of the rear shroud 40 are all circles. For this reason, the inner peripheral surface 83 of the rear bearing forming portion 82 and the outer peripheral surface 52 of the shaft portion 51 form a dynamic pressure radial bearing surface, respectively, and blood flowing between both surfaces 83 and 52 functions as a lubricating fluid. Therefore, the impeller 10 is supported by the pump casing 60 so that the shaft portion 51 of the impeller 10 can rotate in a non-contact manner in the radial direction Dr. The shaft portion 51 of the impeller 10 also has an inner peripheral surface 83 of the rear bearing forming portion 82 (hereinafter, this inner peripheral surface 83 is referred to as a rear dynamic pressure) when the rotational speed of the impeller 10 is low, like the inlet cylinder portion 21. A part of the bearing surface 83 and a part of the outer peripheral surface 52 of the shaft portion 51 are in contact with each other, and when the rotational speed of the impeller 10 exceeds a predetermined rotational speed, it works between both surfaces 83 and 52. Due to the dynamic pressure of the fluid, the shaft portion 51 rises with respect to the rear dynamic pressure bearing surface 83, and the shaft portion 51 of the impeller 10 is rotatably supported by the rear dynamic pressure bearing surface 83 without contact.

  Thus, the two locations of the inlet cylinder portion 21 and the shaft portion 51 of the impeller 10 are supported by the hydrodynamic bearing surfaces 68 and 83 so as to be rotatable in a non-contact manner in the radial direction Dr, in other words, the impeller 10. Are supported at both ends so as to be rotatable in a non-contact manner in the radial direction Dr. Moreover, the impeller 10 is supported at two locations on the front side and the rear side with reference to the position of the center of gravity. Therefore, even if a moment around an axis perpendicular to the rotation axis A is generated, the impeller 10 can be stably supported.

  Further, as described above, since the outer diameter of the shaft portion 51 of the impeller 10 can be reduced, the peripheral speed of the shaft portion 51 can be suppressed. Therefore, shear strain acting on blood flowing between the outer peripheral surface 52 of the shaft portion 51 and the inner peripheral surface 83 of the rear bearing forming portion 82 of the post-pump casing 81 can be reduced, and hemolysis can be suppressed.

  In addition, the position of the impeller 10 in the axial direction Da with respect to the pump casing 60 is held by the magnetic coupling force between the driven magnet 19 in the impeller 10 and the drive magnet 219 of the pump drive device 200. The position of the impeller 10 held by the magnetic coupling force in the axial direction Da is a position where the surface of the impeller 10 and the surface of the pump casing 60 facing each other in the axial direction Da do not contact each other. That is, the impeller 10 is supported so as to be rotatable without contact with respect to the axial direction Da.

  Next, detailed operation of the hydrodynamic bearing pump system and operation of the system based on this operation will be described.

  As described above, even if the impeller 10 rotates, the impeller 10 does not float from the hydrodynamic bearing surfaces 68 and 83 unless the rotation speed is equal to or higher than the predetermined rotation speed. Thus, even if the impeller 10 is rotating, it is not lifted from the hydrodynamic bearing surfaces 68 and 83, and the contact state between the impeller 10 and the hydrodynamic bearing surfaces 68 and 83 is maintained. Wear of the pressure bearing surfaces 68 and 83 and the portion of the impeller 10 that is in contact with the dynamic pressure bearing surfaces 68 and 83 progresses, and the function of the dynamic pressure bearing surfaces 68 and 83 is impaired. Further, when the hydrodynamic bearing pump 100 is an artificial heart pump that transports blood as in the present embodiment, hemolysis and thrombus are generated due to contact between the impeller 10 and the hydrodynamic bearing surfaces 68 and 83. The possibility increases.

  Here, it is assumed that the pump rotational speed is directly proportional to the operation amount of the rotational speed volume 350. In such a system, when the operation amount of the rotation speed volume 350 is stagnant with an operation amount close to the operation amount 0, or when the dynamic pressure bearing pump 100 is started, the operation amount of the rotation speed volume 350 is reduced to the operation amount 0. When the speed is increased slowly, the contact time between the rotating impeller 10 and the hydrodynamic bearing surfaces 68 and 83 becomes long, and wear of the impeller 10 and the hydrodynamic bearing surfaces 68 and 83 proceeds.

  Therefore, when the rotation speed of the impeller 10 is between the rotation speed 0 and the minimum floating speed, the rotation speed of the impeller 10, that is, the rotation speed of the motor 210 is controlled regardless of the operation amount of the rotation speed volume 350. The minimum floating speed is the rotational speed at which the impeller 10 floats from any of the dynamic pressure bearing surfaces 68 and 83 and is supported by these dynamic pressure bearing surfaces 68 and 83 in a non-contact manner. Moreover, the minimum rotation speed displayed on the display 320 in FIG. 7 is the minimum flying speed.

Below, the specific control content in the drive control apparatus 300 is shown.
FIG. 12 shows the flow of control executed by the drive control device 300 based on a computer program in order to realize the operation of the hydrodynamic bearing pump system.
As shown in FIG. 12, when the hydrodynamic bearing pump system is activated, the drive control device 300 monitors whether or not the operation amount of the rotation speed volume 350 is 0 (step S101).

Next, it is monitored whether or not the operation amount of the rotation speed volume 350 is greater than or equal to the specific operation amount S (step S102). When the operation amount of the rotation speed volume 350 becomes equal to or greater than the specific operation amount S, the pump rotation speed is set to a predetermined value as shown in FIG. 9 until the pump rotation speed reaches 0 from the minimum rotation speed. Rotational speed increase control is executed to increase at the increased rotational speed rate (step S103).
In this way, as shown in FIG. 8, in the initial operation section until the operation amount of the rotation volume 350 reaches the specific operation amount S, the operation amount is the specific operation amount S regardless of this operation amount. Immediately after that, the pump speed is increased from 0 to the minimum flying speed (for example, 3000 RPM).

  This predetermined rotational speed change rate does not need to be constant from 0 to the minimum flying speed, and is determined according to the time from when the pump rotational speed is 0. is there. In the example shown in FIG. 9, the rotational speed change rate is low for a very short time from the time point when the pump rotational speed is 0, and the rotational speed change rate gradually increases with time. Thereafter, the pump rotational speed change rate is constant over time until the pump rotational speed reaches the minimum flying speed, and the pump rotational speed increases linearly over time.

From the viewpoint of shortening the contact time between the impeller 10 and the hydrodynamic bearing surfaces 68 and 83, the time for the pump rotation speed to rise to the minimum flying speed is preferably as short as possible. That is, it is preferable that the rotational speed change rate from the pump rotational speed of 0 to the minimum flying speed is high.
However, if the rotation rate change rate of the motor 210 is extremely high, the driven magnet 19 cannot follow the rotation of the driving magnet 219, and the driven magnet 19 steps out of the driving magnet 219.
Therefore, the change rate with the highest rotation rate change rate of the motor 210 within a range where the driven magnet 19 does not step out is set as the limit change rate, and the pump rotation rate is set to a value except for a very short time from when the pump rotation rate is 0. The speed change rate is used as the limit change rate until the minimum flying speed is reached.

  An operation signal indicated by a voltage proportional to the operation amount of the rotation speed volume 350 is input to the computer 310 of the drive control device 300. The computer 310 operates the rotation volume 350 from the time when the power is not supplied to the motor 210 from the drive control device 300, that is, the time when the pump rotation speed is 0, and the operation amount corresponds to the specific operation amount S. Until a signal is input, a control signal indicating power supplied to the motor 210 is not sent to the power conversion circuit 335, or a control signal indicating that power is not supplied to the motor 210 is sent.

  When the rotation speed volume 350 is operated from the time when the drive control device 300 does not supply power to the motor 210 and an operation signal corresponding to the specific operation amount S is input, the computer 310 changes a predetermined rotation speed. A control signal indicating the supplied power at which the pump speed increases to the minimum flying speed at a rate is sent to the power conversion circuit 335. When the power conversion circuit 335 receives this control signal, the power conversion circuit 335 converts the power from the power supply circuit 330 into the power indicated by the control signal and then supplies the power to the motor 210. As a result, when an operation signal corresponding to the specific operation amount S is input to the computer 310, the pump rotation speed immediately increases from 0 to the minimum levitation rotation speed at a predetermined rotation speed change rate.

  For example, as described above, when the motor 210 is an AC motor and the motor rotation speed is controlled by controlling the frequency of the AC voltage supplied to the motor 210, the computer 310 may control the operation signal corresponding to the specific operation amount S. Is sent to the power conversion circuit 335, indicating a frequency corresponding to the rotational speed for each time change shown in FIG. Upon receiving this control signal, the power conversion circuit 335 converts the power from the power supply circuit 330 into AC power having the frequency indicated by the control signal and supplies the AC power to the motor 210.

  In this way, the drive control device 300 increases the pump rotation speed to the minimum flying speed in a very short time while avoiding the step-out of the driven magnet 19 with respect to the drive magnet 219 when the pump is started. Therefore, the contact time between the impeller 10 and the dynamic pressure bearing surfaces 68 and 83 can be shortened.

  As described above, the computer 310 monitors the rotational state of the motor 210 during the execution of the rotational speed increase control until the pump rotational speed reaches 0 from the zero rotational speed. Specifically, the computer 310 determines whether the detection circuit (not shown) of the power conversion circuit 335, the drive current / voltage of the motor 210 output from the sensor 339, and the rotation speed of the motor 210 are within a predetermined specified range. Whether or not is monitored (steps S104 and S105).

  When the driving current / voltage of the motor 210 and the rotation speed of the motor 210 are outside the predetermined specified range, the computer 310 displays “motor current / voltage abnormality” or “motor rotation speed abnormality” on the display 320. A message or the like indicating that it has occurred is displayed (steps S121 and S122).

Further, the computer 310 stops the power supply from the power conversion circuit 335 and stops the rotation of the motor 210 (step S123).
Then, the computer 310 monitors whether or not the rotational speed of the motor 210 has become zero, and when the rotational speed of the motor 210 has become zero, a message or the like indicating that an abnormality has occurred in the display 320. Is terminated (steps S124 and S125).

  In this way, the computer 310 monitors the drive state of the motor 210 until the pump rotational speed reaches the minimum flying speed from 0, and if an abnormality is detected, it indicates that an abnormality has occurred. The information shown is displayed and the motor 210 is stopped.

  On the other hand, if no abnormality is detected in the driving state of the motor 210 until the pump speed reaches 0 from the pump speed of 0 to the minimum flying speed, the time when the rotational speed of the motor 210 reaches the minimum flying speed Thus, the pump rotational speed is controlled to the rotational speed corresponding to the operation amount of the rotational speed volume 350 (steps S106 and S107).

  Specifically, when an operation signal for operating the rotation speed volume 350 is input, the computer 310 generates a control signal indicating supply power corresponding to the operation amount of the rotation speed volume 350 indicated by the operation signal. Send to 335. When receiving the control signal, the power conversion circuit 335 converts the power from the power supply circuit 330 into the power indicated by the control signal and supplies the power to the motor 210. As a result, the pump rotation speed becomes a rotation speed corresponding to the operation amount of the rotation speed volume 350.

However, even when the motor rotational speed is equal to or higher than the rotational speed corresponding to the minimum floating rotational speed of the hydrodynamic bearing pump 100, if the rotational speed change rate of the motor 210 becomes higher than the above limit change rate, As a result, the driven magnet 19 is stepped out.
For this reason, as shown in FIG. 10, when the operation amount change rate is higher than the operation amount change rate corresponding to the limit change rate LIM, the drive control apparatus 300 does not depend on the operation amount change rate. Is set to the limit change rate LIM.
Specifically, after the number of rotations of the motor 210 reaches the minimum floating number of rotations, the computer 310 obtains the operation amount change rate sequentially from the operation signals sequentially input, and this operation amount change rate corresponds to the limit change rate LIM. When the operation amount change rate is higher than the operation amount change rate, the control signal indicating the supplied power at which the rotation speed change rate of the motor 210 becomes the limit change rate LIM is sent to the power conversion circuit 335.

In the above, the rotation rate change rate of the motor 210 is suppressed to the limit change rate LIM or less by software processing, but the rotation rate change rate of the motor 210 is suppressed to the limit change rate LIM or less by hardware. It may be.
Specifically, for example, in the power conversion circuit 335, the rotation rate change rate of the motor 210 corresponding to the change rate of the power supplied to the motor (for example, the frequency change rate of AC power) is equal to or less than the limit change rate LIM. A circuit is provided for slowing the rate of change in the power supplied to the motor 210. In this case, a circuit that slows the rate of change in power of the value indicated by the control signal may be provided on the side where the control signal of the power conversion circuit 335 is input, or the rate of change in power on the side that outputs power to the motor 210. A circuit for blunting may be provided. Further, in this case, when the operation signal corresponding to the specific operation amount S is input when the hydrodynamic bearing pump 100 is started, the computer 310 immediately increases the pump rotation speed to the power conversion circuit 335 and causes the minimum rotation to rise. Send a control signal indicating the supply power to be a number. In addition, even after the operation amount of the rotation speed volume 350 reaches the specific operation amount S, the computer 310 changes the operation amount of the operation amount indicated by the operation signal received this time with respect to the operation amount indicated by the operation signal received earlier. Even when the rate is higher than the operation amount change rate corresponding to the limit change rate LIM, a control signal indicating a supply power that provides a pump speed proportional to the operation amount received this time is sent. Even when the power conversion circuit 335 receives these control signals, the power conversion circuit 335 supplies the electric power supplied to the motor so that the rotational speed change rate of the motor 210 corresponding to the change rate of the electric power supplied to the motor is equal to or less than the limit change rate LIM. Reduce the rate of change and supply power to the motor.

Thereafter, as shown in FIG. 8, the drive control apparatus 300 monitors whether or not the operation amount of the rotation speed volume 350 has become less than the specific operation amount S (step S108).
Then, when the operation amount of the rotation speed volume 350 becomes less than the specific operation amount S, the pump rotation number is maintained at the minimum floating rotation number unless the operation amount becomes zero (steps S109 and S110).

  For this reason, when an operation signal corresponding to an operation amount less than the specific operation amount S is input, the computer 310 supplies the pump rotation speed at which the pump rotation speed becomes the minimum floating rotation speed unless an operation signal corresponding to the operation amount 0 is input. A control signal indicating power is sent to the power conversion circuit 335. When the power conversion circuit 335 receives this control signal, the power conversion circuit 335 converts the power from the power supply circuit 330 into the power indicated by the control signal and then supplies the power to the motor 210. As a result, even if an operation signal corresponding to an operation amount less than the specific operation amount S is input to the computer 310, the pump rotation speed is maintained at the minimum flying speed unless an operation signal corresponding to the operation amount 0 is input. .

  When the operation amount of the rotation speed volume 350 becomes 0, the drive control device 300 immediately decreases the rotation speed of the motor 210 so that the pump rotation speed becomes 0 (steps S111 and S112). At this time, as shown in FIG. 9, the pump rotational speed is decreased at a predetermined rotational speed change rate until the pump rotational speed becomes 0 from the flying minimum rotational speed.

  For this reason, when an operation signal corresponding to an operation amount of 0 is input, the computer 310 changes the pump rotation speed from the minimum floating rotation speed to 0 at the predetermined rotation speed change rate described above with reference to FIG. A control signal indicating the decreasing supply power is sent to the power conversion circuit 335. When the power conversion circuit 335 receives this control signal, the power conversion circuit 335 converts the power from the power supply circuit 330 into the power indicated by the control signal and then supplies the power to the motor 210. As a result, when an operation signal corresponding to the operation amount 0 is input to the computer 310, the pump rotation speed immediately decreases from the minimum flying speed to the rotation speed 0 at a predetermined rotation speed change rate.

  Then, when it is confirmed that the rotation number of the motor 210 has become 0, the drive control device 300 ends the control (step S112).

As described above, the drive control device 300 rotates in the initial operation interval from the operation amount 0 to the predetermined specific operation amount S regardless of the operation amount change in the initial operation interval. On the condition that the operation amount of the several volume 350 becomes the specific operation amount S, the rotational speed of the impeller 10 at a predetermined rotational speed change rate up to the minimum levitation rotational speed at which the impeller 10 is supported in a non-contact state. Increase. Then, in the process of controlling the power supplied to the pump drive device 200 so that the rotation speed of the impeller 10 increases at a predetermined rotation speed change rate up to the minimum flying speed, the drive state of the pump drive device 200 is controlled. When it is determined that the parameter indicating is not within a predetermined normal range, the power supply to the pump drive device 200 is stopped.
Therefore, when the pump is started, there is a possibility that the rotational speed of the impeller 10 of the dynamic pressure bearing pump does not increase to the minimum flying speed for some reason, such as a malfunction of the pump driving device 200. In such a case, by stopping the power supply to the pump drive device 200, the time during which the rotating impeller 10 and the hydrodynamic bearing surfaces 68 and 83 are in contact with each other can be prevented from increasing. The durability of the pressure bearing pump can be improved more reliably.

  Further, once the dynamic pressure bearing pump 100 is driven, the pump rotational speed is maintained at the floating minimum rotational speed or more unless the operation amount of the rotational speed volume 350 becomes zero. For this reason, once the dynamic pressure bearing pump 100 is driven, contact between the impeller 10 and the dynamic pressure bearing surfaces 68 and 83 is avoided unless the operation amount becomes zero, regardless of the operation amount of the rotation volume 350. can do. Further, after the dynamic pressure bearing pump 100 is driven, when the operation amount of the rotational speed volume 350 becomes 0, the pump rotational speed is lowered to 0 within an extremely short time, and therefore the rotating impeller when the pump is stopped. 10 and the hydrodynamic bearing surfaces 68 and 83 can be shortened.

  When the cycle change switch 356 of the drive control device 300 is operated after the dynamic pressure bearing pump 100 is driven, the pump rotation speed increases or decreases at a predetermined cycle as shown in FIG. The reason for periodically increasing or decreasing the pump rotational speed in this way is to efficiently discharge bubbles contained in the pump casing 60 to the outside of the pump casing 60. For this reason, the change cycle of the pump rotation speed and the fluctuation range of the pump rotation speed when the pump rotation speed is periodically increased or decreased efficiently discharges bubbles according to the shape of the pump casing 60 and the impeller 10 and the like. It is set to a value suitable for.

  When the operation signal of the period change switch 356 is input while the dynamic pressure bearing pump 100 is being driven, the computer 310 supplies the supply power that increases or decreases the pump rotation speed with a predetermined period and a predetermined fluctuation range. The control signal shown is sent to the power conversion circuit 335. When the power conversion circuit 335 receives this control signal, the power conversion circuit 335 converts the power from the power supply circuit 330 into the power indicated by the control signal and then supplies the power to the motor 210. As a result, the pump rotational speed increases or decreases with a predetermined cycle and with a predetermined fluctuation range.

By the way, in order to efficiently discharge the bubbles, it is conceivable that the minimum rotational speed when the pump rotational speed is periodically increased or decreased is less than the minimum flying speed. Thus, even when the minimum rotational speed is set to be less than the floating rotational speed, it is preferable to shorten the contact time between the impeller 10 and the hydrodynamic bearing surfaces 68 and 83. Therefore, in such a case, as shown in FIG. 11, in one cycle T, the total time T _LIM in which the pump rotation speed changes at the limit change rate is the total time T _{LIM <} in which the pump rotation speed changes below the limit change rate. It is preferable to determine the period of one cycle and the change tendency of the pump rotation speed during one cycle so as to increase the number.

  In such a hydrodynamic bearing pump system, the contact time between the rotating impeller 10 and the hydrodynamic bearing surfaces 68 and 83 can be shortened. For this reason, wear of the impeller 10 and the dynamic pressure bearing surfaces 68 and 83 can be suppressed, and the durability of the dynamic pressure bearing pump 100 can be improved. Further, hemolysis and thrombus generation at the contact portion between the rotating impeller 10 and the hydrodynamic bearing surfaces 68 and 83 can be suppressed.

"Second embodiment"
Next, a second embodiment of the hydrodynamic bearing pump system will be described with reference to FIG.
The hydrodynamic bearing pump system of the present embodiment differs from the first embodiment in the case where an abnormality is detected in the state of the motor 210 during pump activation, and the other configuration and control contents are the same. is there. Therefore, in the following, the description will be focused on the configuration different from that of the first embodiment, and the configuration common to the first embodiment will be denoted by the same reference numerals in the drawing and description thereof will be omitted.

  As shown in FIG. 13, in this embodiment, the operation amount of the rotation speed volume 350 is equal to or greater than the specific operation amount S, and the motor 310 is operated by the computer 310 until the pump rotation speed reaches 0 from the minimum rotation speed. The rotation state of 210 is monitored. When the driving current / voltage of the motor 210 and the rotation speed of the motor 210 are outside the predetermined specified range, the computer 310 displays “motor current / voltage abnormality” or “motor rotation speed abnormality” on the display 320. Is displayed (step S121, S122).

  Next, the computer 310 stops the power supply from the power conversion circuit 335 and stops the rotation of the motor 210 (step S123).

Then, the computer 310 monitors whether or not the rotation number of the motor 210 has become zero (step S124).
After the rotation number of the motor 210 becomes zero, it is further monitored whether or not the operation amount of the rotation number volume 350 has returned to zero (step S131).
When the operation amount of the rotation speed volume 350 returns to 0, the display of a message or the like indicating that an abnormality has occurred on the display 320 is terminated (step S132).

Next, the number of times that the stop control process in step S123 is continuously executed is counted, and it is confirmed whether or not the number of executions is equal to or less than a predetermined number of times: N (step S133). If the number of executions is less than N, the process returns to step S101 and the activation process is executed again.
On the other hand, when the number of executions is N or more, the operation of the hydrodynamic bearing pump system is stopped as it is.

In this way, the computer 310 monitors the drive state of the motor 210 until the pump rotational speed reaches the minimum flying speed from 0, and if an abnormality is detected, it indicates that an abnormality has occurred. The information shown is displayed and the motor 210 is stopped.
Then, after the motor 210 is stopped, the computer 310 does not restart the pump unless the operation amount of the rotation speed volume 350 returns to zero. The computer 310 does not restart the pump regardless of how the rotation speed volume 350 is operated after the pump has reached the predetermined number of times N.

  As described above, in this embodiment, after the motor 210 is stopped, the pump is not restarted unless the operation amount of the rotation speed volume 350 returns to zero.

  Further, in this embodiment, the pump restart cannot be repeated after the pump restart reaches N times that is the specified number. Thereby, when restarting is repeated, for example, when disadvantages such as damage to the hydrodynamic bearing and hemolysis occur, this can be prevented.

In the second embodiment, the pump is not restarted unless the operation amount of the rotation speed volume 350 returns to 0 after the motor 210 is stopped. However, the present invention is not limited to this. Step S131 may be abolished, and after the motor 210 is stopped, the pump may be automatically restarted until the number of restarts of the pump reaches the specified number N times.
Furthermore, step S133 may be abolished, and the number of restarts of the pump may not be limited, and the motor 210 may be automatically restarted after being stopped. Such a configuration is suitable when it is better to operate the pump than to stop it.

"Third embodiment"
Next, a third embodiment of the hydrodynamic bearing pump system will be described with reference to FIG.
The dynamic pressure bearing pump system of the present embodiment differs from the first and second embodiments in the case where an abnormality is detected in the state of the motor 210 during pump activation, and other configurations and control contents Is the same. Therefore, in the following, the description will be focused on the configurations different from those of the first and second embodiments, and the same reference numerals are given to the configurations common to the first embodiment, and the description thereof will be omitted.

  As shown in FIG. 14, in this embodiment, the operation amount of the rotation speed volume 350 is equal to or greater than the specific operation amount S, and the motor 310 is operated by the computer 310 until the pump rotation speed reaches 0 from the minimum rotation speed. The rotation state of 210 is monitored. When the driving current / voltage of the motor 210 and the rotation speed of the motor 210 are outside the predetermined specified range, the computer 310 displays “motor current / voltage abnormality” or “motor rotation speed abnormality” on the display 320. Is displayed (step S121, S122).

  Next, the computer 310 stops the power supply from the power conversion circuit 335 and stops the rotation of the motor 210 (step S123).

Then, the computer 310 monitors whether or not the rotation number of the motor 210 has become zero (step S124).
After the rotation number of the motor 210 becomes zero, the computer 310 further monitors whether or not the operation amount of the rotation number volume 350 has returned to zero (step S141).

  When the operation amount of the rotational speed volume 350 returns to 0, it is confirmed by an operator or the like whether or not the cause of the abnormality that has occurred in the rotational state of the motor 210 has been eliminated. For this, when it is confirmed that the cause of the abnormality that has occurred in the rotation state of the motor 210 has been eliminated, the operator performs a predetermined operation on the drive control device 300 indicating that the malfunction has been reset. . When the predetermined operation is input (step S142), the computer 310 accepts the reset operation, and ends the display of a message indicating that an abnormality has occurred on the display 320 (step S143).

In this way, the computer 310 monitors the drive state of the motor 210 until the pump rotational speed reaches the minimum flying speed from 0, and if an abnormality is detected, it indicates that an abnormality has occurred. The information shown is displayed and the motor 210 is stopped.
After the motor 210 is stopped, the pump cannot be restarted unless the abnormality that has occurred in the driving state of the motor 210 is resolved.
Thereby, when the pump is restarted, it is possible to prevent the drive state from becoming abnormal again.

(Other variations)
The present invention is not limited to the above-described embodiment, and includes various modifications made to the above-described embodiment without departing from the spirit of the present invention. That is, the specific shapes, configurations, and the like given in the embodiment are merely examples, and can be changed as appropriate.

"First variation"
For example, the drive controller 300 for the hydrodynamic bearing pump is not limited to the configuration shown in FIG. For example, as shown in FIG. 15, the drive control device 300a may make the configuration of the rotation speed volume 350a different from that of the first embodiment.
As shown in FIG. 16, the rotational speed volume 350a is a variable resistor, like the rotational speed volume 350 of the first embodiment, and includes a volume knob 351, a conductor 352 attached to the volume knob 351, And a resistor 353 in contact with the conductor 352.

  Furthermore, the rotation speed volume 350a avoids contact between the conductor 352 attached to the volume knob 351 and the resistor 353 until the operation amount of the volume knob 351 changes from the operation amount 0 to the specific operation amount Sa. A member 354 is provided. At least one of the contact avoidance member 354 and the conductor 352 has a click feeling from the volume knob 351 to the operator in the process in which the operator operates the volume knob 351 from the operation amount 0 to the specific operation amount Sa. A click feeling generation unit 354a is provided. The click feeling is a feeling that the force received from the volume knob 351 changes suddenly during the operation of the volume knob 351. The click sensation generating portion 354a can be formed of, for example, a convex portion that is formed on one of the contact avoidance member 354 and the conductor 352 and protrudes to the other side. The click feeling generating portion 354a includes a convex portion that is formed on one of the contact avoiding member 354 and the conductor 352 and protrudes on the other side, and a concave portion that is formed on the other side and into which the convex portion temporarily enters. can do. Moreover, the click feeling generation | occurrence | production part 354a can also be comprised with elastic bodies, such as a leaf | plate spring provided in one side and protruded in the other side.

  The casing 340 provided with the volume knob 351 has an off mark 346 indicating that the operation amount of the rotation speed volume 350a is 0 and the pump drive is turned off, and the operation amount of the rotation speed volume 350a is the specific operation amount Sa. An on mark 347 indicating that the pump is turned on is shown.

  In the operation of the hydrodynamic bearing pump system provided with such a drive control device 300a, when the pump is started, the operator operates the rotation volume 350a, and the operation amount of the rotation volume 350a is the operation amount 0 (pump drive off). Then, as shown in FIG. 17, the dynamic pressure bearing pump 100 is started, and the pump rotation speed immediately reaches 0 to the minimum flying speed (for example, 3000 RPM). At this time, as described above with reference to FIG. 9, the pump rotational speed increases at a predetermined rotational speed change rate from the pump rotational speed of 0 to the minimum flying height. At this time, the operator can clearly recognize that the pump drive ON operation has been performed with a click feeling received in the operation process of the rotation speed volume 350a.

  Further, once the operation amount of the rotation speed volume 350a becomes the specific operation amount Sa (pump drive ON), the pump rotation speed is proportional to the operation amount of the rotation speed volume 350a unless the operation amount is less than the specific operation amount Sa.

  After the operation amount of the rotation speed volume 350a reaches the specific operation amount Sa (pump drive on), when the operation amount falls below the specific operation amount Sa, the hydrodynamic bearing pump 100 stops and immediately, the pump rotation speed becomes 0. become. At this time, as described above with reference to FIG. 9, the pump rotational speed decreases at a predetermined rotational speed change rate until the pump rotational speed becomes zero.

  Note that the rotation speed volume 350a has the click feeling generation unit 354a, and thus the rotation speed volume 350a is basically maintained at a position halfway between the operation amount 0 and the specific operation amount Sa. I can't. Therefore, when the operation amount of the rotation speed volume 350a is increased from the operation amount 0, this operation amount basically becomes equal to or greater than the specific operation amount Sa, and when the operation amount of the rotation speed volume 350a is decreased from the specific operation amount Sa, The operation amount is basically 0.

  Specifically, when the pump is activated, the conductor 352 provided in the volume knob 351 and the resistor 353 are not in contact with each other until the operation amount of the rotational speed volume 350a reaches the specific operation amount Sa. Therefore, no operation signal is input to the computer 310 of the drive control device 300a unless the operation amount of the rotation speed volume 350a becomes the specific operation amount Sa. When the operation amount of the rotational speed volume 350a reaches the specific operation amount Sa, the conductor 352 provided on the volume knob 351 and the resistor 353 come into contact with each other, and the computer 310 receives an operation signal corresponding to the specific operation amount Sa. Entered. When this operation signal is input, the computer 310 sends a control signal indicating power supplied to the pump converter 335 to increase the pump speed to the minimum flying speed at a predetermined speed change rate. When the power conversion circuit 335 receives this control signal, the power conversion circuit 335 converts the power from the power supply circuit 330 into the power indicated by the control signal and then supplies the power to the motor 210. As a result, the pump speed immediately increases from 0 to the minimum flying speed at a predetermined speed change rate.

  Once the operation signal corresponding to the specific operation amount Sa is input, the computer 310 supplies power that has a pump speed proportional to the operation amount indicated by the input operation signal until the operation signal is not input. Is sent to the power conversion circuit 335. When the power conversion circuit 335 receives this control signal, the power conversion circuit 335 converts the power from the power supply circuit 330 into the power indicated by the control signal and then supplies the power to the motor 210. As a result, the pump rotational speed becomes a rotational speed proportional to the operation amount of the rotational speed volume 350a.

  However, as described above with reference to FIG. 10, when the operation amount change rate is higher than the operation amount change rate corresponding to the limit change rate LIM, the rotation rate change rate of the motor 210 is equal regardless of the operation amount change rate. It becomes the limit change rate LIM.

  When the operation signal is not input, that is, when the operation amount of the rotation speed volume 350a falls below the specific operation amount Sa, the computer 310 has the rotation speed 0 at a predetermined rotation speed change rate as described above with reference to FIG. Descend immediately.

  As described above, according to the hydrodynamic bearing pump system of this modification, the contact time between the rotating impeller 10 and the hydrodynamic bearing surfaces 68 and 83 can be shortened as in the above embodiments. The durability of the pressure bearing pump 100 can be improved, and hemolysis and thrombus generation at the contact portion between the rotating impeller 10 and the dynamic pressure bearing surfaces 68 and 83 can be suppressed.

  In the above modification, the rotation speed volume 350a also functions as a pump drive switch, and no separate pump drive switch is provided. Once the dynamic pressure bearing pump 100 is driven, the rotation speed volume 350a As long as the operation amount does not become zero, the hydrodynamic bearing pump 100 does not stop. In other words, in each of the above embodiments, for example, when the operation amount of the rotation speed volume 350a is a halfway operation amount, the dynamic pressure bearing pump 100 cannot be stopped, and at the time of activation, the rotation speed volume 350a The operation amount is not a halfway operation amount.

  The hydrodynamic bearing pump 100 of each of the above embodiments is a radial hydrodynamic bearing in which the hydrodynamic bearing surfaces 68 and 83 support the impeller 10 in a non-contact manner in the radial direction. As described above, the present invention can be provided even if the dynamic pressure bearing is a thrust dynamic pressure bearing that supports the impeller in a non-contact manner in the axial direction. Moreover, even if the dynamic pressure bearing pump has both a radial dynamic pressure bearing and a thrust dynamic pressure bearing, the present invention can be applied. In this case, the minimum flying speed is the minimum rotating speed at which the impeller floats with respect to both the radial dynamic pressure bearing and the thrust dynamic pressure bearing.

"Second modification"
The present invention can also be applied to a built-in type pump incorporating a motor.
As shown in FIG. 18, such a built-in type axial flow pump includes a fixed body 502 having a cylindrical impeller mounting portion 501 and an impeller that is rotatably mounted on the outer periphery of the impeller mounting portion 501. 503 and a cylindrical casing 504 covering the outer peripheral side of the fixed body 502 and the impeller 503.

  Here, the central axis of the cylindrical impeller mounting portion 501 is defined as a fixed body axis Af, and the direction in which the fixed body axis Af extends is defined as a fixed body axis direction Df. The central axis of the cylindrical casing 504 is defined as a casing axis Ac, and the direction in which the casing axis Ac extends is defined as a casing axis direction Dc. In a state in which the axial flow pump is completed, the fixed body axis Af and the casing axis Ac coincide with each other. Moreover, let one side of the fixed body axial direction Df and the casing axial direction Dc be a suction side, and let the other side be a discharge side.

  The fixed body 502 includes a fixed shaft portion 505, a plurality of guide blades 506 fixed to the outer periphery of the fixed shaft portion 505, and a suction side cone 507 that is screwed to the suction side of the fixed shaft portion 505. . The fixed shaft portion 505 includes the above-described impeller mounting portion 501 and a discharge-side cone 508 fixed to the discharge side of the impeller mounting portion 501. On the suction side of the cylindrical impeller mounting portion 501, a female screw hole 509 that is recessed toward the discharge side and that is centered on the fixed body axis Af is formed.

  The discharge-side cone 508 of the fixed shaft portion 505 is formed on the discharge-side tip portion 510, the discharge-side cone barrel portion 511 formed on the suction side of the discharge-side tip portion 510, and the suction side of the discharge-side cone barrel portion 511. A discharge side straight body portion 512. The surface of the discharge-side tip portion 510 is formed with a surface having a predetermined radius of curvature on a point on the suction side of the discharge-side tip portion 510 on the fixed body axis Af. The discharge-side cone body 511 is formed continuously from the suction-side edge of the discharge-side tip portion 510 and gradually increases in diameter toward the suction side around the fixed body axis Af. The discharge-side straight barrel portion 512 is continuously formed from the suction side edge of the discharge-side cone barrel portion 511 and has a cylindrical shape with the fixed body axis Af as the center.

  The suction side cone 507 includes a suction side tip 520, a suction side cone body 521 formed on the discharge side of the suction side tip 520, and a suction side formed on the discharge side of the suction side cone body 521. It has a straight body part 522 and a cone shaft part 524 in which a male screw 523 that can be screwed into the female screw hole 509 of the fixed shaft part 505 is formed. The surface of the suction-side tip 520 is formed as a curved surface having a predetermined radius of curvature on a point on the discharge side of the suction-side tip 520 on the central axis of the cone shaft 524. The suction-side cone body 521 is formed continuously from the discharge-side edge of the suction-side tip 520 and gradually increases in diameter toward the discharge side with the central axis of the cone shaft 524 as the center. The suction side straight body portion 522 is continuously formed from the discharge side edge of the suction side cone body portion 521, and has a cylindrical shape with the center axis of the cone shaft portion 524 as the center.

  A first permanent magnet (not shown) having a magnetization direction facing the axial direction of the cone shaft portion 524 is provided in the suction side straight body portion 522.

  The suction side cone 507 is screwed to the fixed shaft portion 505 by the male screw 523 of the cone shaft portion 524 being screwed into the female screw hole 509 of the fixed shaft portion 505. At this time, the center axis line of the cone shaft part 524 and the fixed body axis line Af of the fixed shaft part 505 coincide with each other.

  The impeller 503 includes a cylindrical sleeve 531 that is rotatably mounted on the outer peripheral side of the impeller mounting portion 501 of the fixed body 502, a plurality of blades 535 that are fixed to the outer periphery of the sleeve 531, and the sleeve 531. And a drive permanent magnet 532 and a second permanent magnet 533 that are provided.

  The permanent magnet for driving 532 is arranged so that the magnetization direction faces the radial direction with respect to the fixed body axis Af. Further, the second permanent magnet 533 is arranged on the suction side with respect to the driving permanent magnet 532. Further, the second permanent magnet 533 has a magnetization direction in the fixed body axial direction Df and has the same polarity as the one magnetic pole with respect to one of the magnetic poles of the first permanent magnet (not shown). It arrange | positions so that a magnetic pole may oppose.

A plurality of blades 535 are fixed to the outer periphery of the sleeve 531 at equal intervals in the circumferential direction. The blade 535 extends on the outer periphery of the sleeve 531 in a spiral shape around the fixed body axis Af. Specifically, when viewed from the suction side, the blade 535 extends to the discharge side while extending counterclockwise from the front end on the most suction side. Similarly, the guide vane 506 extends in a spiral manner around the fixed body axis Af. However, the guide vane 506 extends to the discharge side while extending clockwise from the front end on the most suction side.
The casing 504 has a cylindrical shape as a whole, and has a suction port 541 formed at one end and a discharge port 542 formed at the other end. A coil 550 that generates a rotating magnetic field is provided in the casing 504.

  In such a configuration, when a rotating magnetic field is generated inside the casing 504 by the coil 550 provided in the casing 504, the driving permanent magnet 532 in the impeller 503 follows this rotating magnetic field. As a result, the impeller 503 rotates with the casing axis Ac (= fixed body axis Af) as the center axis. By the rotation of the impeller 503, a force for turning the fluid in the casing 504 from the blade 535 toward the discharge side is applied, and the flow velocity in the turning direction about the casing axis Ac is increased. The guide vane 506 increases the static pressure by reducing the flow velocity in the swirling direction with respect to the fluid whose flow velocity in the swirling direction is increased. The fluid whose static pressure has been increased is discharged through the discharge port 542 on the discharge side of the casing 504.

  As described above, even when the pump drive device including the coil 550 that rotates the impeller 503 is incorporated in the casing 504, the drive control device that controls the pump drive device has the same configuration as that of the previous embodiment. Can be adopted.

"Still other variations"

  Furthermore, in each said embodiment, although the rotation speed volume 350,350a was illustrated as a rotation speed operation end, it is not restricted to this. For example, as shown in FIG. 19, a button-type or touch-panel type controller 400 provided with operation buttons 410 may be separately provided. In that case, the signal output from the controller 400 to the computer 310 may be either an analog signal or a digital signal.

  The hydrodynamic bearing pump 100 of each of the above embodiments is a radial hydrodynamic bearing in which the hydrodynamic bearing surfaces 68 and 83 support the impeller 10 in a non-contact manner in the radial direction. The present invention can be applied even if the dynamic pressure bearing is a thrust dynamic pressure bearing that supports the impeller in a non-contact manner in the axial direction as in the dynamic pressure bearing pump described in Patent Document 1 described. Moreover, even if the dynamic pressure bearing pump has both a radial dynamic pressure bearing and a thrust dynamic pressure bearing, the present invention can be applied. In this case, the minimum flying speed is the minimum rotating speed at which the impeller floats with respect to both the radial dynamic pressure bearing and the thrust dynamic pressure bearing.

  Moreover, although each above embodiment illustrated the artificial heart pump as an example of a hydrodynamic bearing pump, this invention is not limited to an artificial heart pump, An impeller is rotated by a hydrodynamic bearing without contact. The present invention may be applied to any pump that can support the pump.

1: dynamic pressure bearing pump unit, 6: suction port, 7: discharge port, 9: discharge hose connection pipe, 10: impeller, 11: blade, 12: impeller inlet, 13: impeller outlet, 19: driven Magnet: 20: Front shroud, 21: Entrance cylinder, 22: Outer peripheral surface, 31: Front side plate, 32: Front side, 40: Rear shroud, 41: Rear side plate, 42: Rear side, 51: Shaft, 52: Outer peripheral surface, 53: Rear end surface, 56: Through hole, 60: Pump casing, 61: Pump front casing, 62: Suction hose connecting pipe portion, 65: Diameter expansion pipe portion, 67: Front bearing forming portion, 68: Inner circumference Surface (front dynamic pressure bearing surface, dynamic pressure bearing portion), 71: front casing main body, 72: front facing portion, 73: inner surface, 75: front main body cylindrical portion, 76: inner peripheral surface, 78: connecting pipe front split 81: casing after pump, 82: rear bearing forming portion, 83: inner peripheral surface (rear dynamic pressure bearing , Dynamic pressure bearing portion), 85: rear wall plate portion, 86: inner surface, 91: rear casing main body portion, 92: rear main body cylinder portion, 93: inner peripheral surface, 95: rear surface facing portion, 96: inner surface, 98: Connecting pipe rear split part, 100: dynamic pressure bearing pump, 200: pump driving device, 210: motor, 211: output shaft, 219: driving magnet, 220: cup, 221: cup cylindrical part, 225: motor connecting part, 230 : Driving device casing, 231: casing main body, 232: casing cylindrical part, 233: heat radiation fin, 234: power cable plate, 235: casing bottom part, 236: screw, 241: cap, 242: pump fitting part, 244: pump Receiving portion, 246: engaging portion, 250: lock member, 300, 300a: drive control device, 310: computer (power control portion, determination portion), 320: display , 321: Pump discharge flow rate, 323: Pump operation state, 324: Pump maximum rotation speed, 325: Pump maximum flow rate, 326: Pump minimum rotation speed, 327: Pump minimum flow rate, 330: Power supply circuit, 335: Power conversion circuit ( Power control unit), 339: sensor (detection unit), 340: casing, 341: operation amount mark, 342: operation amount mark, 346: off mark, 347: on mark, 350, 350a: rotation speed volume (rotation speed) Operation end), 352: conductor, 353: resistor, 354: contact avoidance member, 354a: click feeling generating portion, 355: power switch, 356: period change switch (frequency operation end), 501: impeller mounting portion, 502 : Fixed body, 503: Impeller, 504: Casing, 505: Fixed shaft part, 506: Guide vane, 507: Suction side cone, 508: Discharge Outlet cone, 509: female screw hole, 510: discharge-side tip, 511: discharge-side cone barrel, 512: discharge-side barrel, 520: suction-side tip, 521: suction-side cone, 522: Suction side straight body portion, 523: male screw, 524: cone shaft portion, 531: sleeve, 532: driving permanent magnet, 533: second permanent magnet, 535: blade, 541: suction port, 542: discharge port, 550 : Coil, LIM: Limit change rate, Pr: Impeller flow path

Claims (16)

A hydrodynamic bearing pump having an impeller and a fixed body formed with a hydrodynamic bearing portion that rotatably supports the impeller around a rotation axis , a suction port for sucking blood, and a discharge port for discharging blood ;
A pump driving device that rotates the impeller of the hydrodynamic bearing pump in accordance with the supplied power;
A drive control device for operating the hydrodynamic bearing pump by controlling the pump drive device,
The drive control device includes:
A rotational speed operation end for changing the rotational speed of the impeller;
In the process in which the operation amount at the rotation speed operation end increases from the operation amount 0, in the initial operation section from the operation amount 0 to the predetermined specific operation amount, regardless of the operation amount change in the initial operation section, the Predetermined rotation up to the minimum levitation speed at which the impeller floats up from the hydrodynamic bearing and is supported in a non-contact state on condition that the operation amount at the rotation speed operation end becomes the specific operation amount The electric power supplied to the pump drive device is controlled so that the rotation speed of the impeller increases at a rate of change in the number of revolutions. When the operation amount of the rotation speed operation end is equal to or greater than the specific operation amount, the operation of the rotation speed operation end A power control unit for controlling the power supplied to the pump driving device so that the rotation speed of the impeller corresponds to the amount;
A detection unit for detecting a parameter indicating a driving state of the pump driving device;
In the process in which the power control unit controls the power supplied to the pump driving device so that the rotational speed of the impeller increases at the predetermined rotational speed change rate up to the floating minimum rotational speed, It is determined whether or not the parameter indicating the driving state of the pump driving device detected by the detection unit is within a predetermined normal range, and when it is determined that the parameter is not within the normal range, the power control unit A determination unit for instructing to stop power supply to the pump drive device;
The Bei Eteiru dynamic bearing pump system. The hydrodynamic bearing pump system according to claim 1,
The dynamic pressure bearing pump system that enables the drive control device to restart the pump drive device when it is recognized that the operation amount at the rotation speed operation end has returned to 0 after the pump drive device is stopped. In the hydrodynamic bearing pump system according to claim 1 or 2,
The drive control device is a hydrodynamic bearing pump system that restricts restart of the pump drive device when the restart of the pump drive device reaches a predetermined number of times. In the hydrodynamic bearing pump system according to any one of claims 1 to 3,
When it is determined that the parameter indicating the drive state of the pump drive device is not within the normal range, the drive control device receives an input indicating that the cause of the abnormality that has occurred in the pump drive device has been resolved. A hydrodynamic bearing pump system that enables the pump drive device to be restarted. In the hydrodynamic bearing pump system according to any one of claims 1 to 4,
Before SL power control unit, wherein when the operation amount of the rotational speed operating end Once in the specific operation amount or more, even if the operation amount becomes less than the specific operation amount, as long as the operation amount does not become the operation amount 0, A hydrodynamic bearing pump system that controls electric power supplied to the pump drive device so that the rotation speed of the impeller maintains the minimum flying height. In the hydrodynamic bearing pump system according to any one of claims 1 to 5,
The power control unit is configured to reduce the rotation speed of the impeller from the minimum flying speed to 0 when the operation amount becomes the operation amount 0 after the operation amount at the rotation speed operation end once exceeds the specific operation amount. A hydrodynamic bearing pump system that controls electric power supplied to the pump driving device so that the rotational speed is decreased at a predetermined rotational speed change rate until it becomes. In the hydrodynamic bearing pump system according to any one of claims 1 to 6,
The rotation speed operation end has a switch function for operating power supply to and disconnection from the pump drive device, the rotation speed operation end of the operation amount 0 is an off position, and the specific operation amount A hydrodynamic bearing pump system in which the position of the rotation speed operation end is the on position. The hydrodynamic bearing pump system according to claim 7,
The power control unit is configured to decrease the rotation speed at a predetermined rotation speed change rate until the rotation speed of the impeller becomes 0 when the rotation speed operation end changes from the ON position to the OFF position side. A hydrodynamic bearing pump system for controlling electric power supplied to the pump driving device. In the hydrodynamic bearing pump system according to any one of claims 1 to 8,
Having a display part indicating a state of the hydrodynamic bearing pump;
The said display part is a dynamic pressure bearing pump system which displays the discharge amount of the said dynamic pressure bearing pump corresponding to the said minimum floating speed or the said minimum floating speed. In the hydrodynamic bearing pump system according to any one of claims 1 to 9,
A housing in which the power control unit is housed and the rotation speed operation end is attached to the outside;
The hydrodynamic bearing pump system, wherein a mark indicating the position of the specific operation amount at the rotation speed operation end is attached to the housing. In the hydrodynamic bearing pump system according to any one of claims 1 to 10,
Having a cycle changing operation end for increasing or decreasing the rotational speed of the impeller at a predetermined cycle;
The power control unit increases or decreases the rotation speed of the impeller at a predetermined cycle when the cycle change operation end is operated when the operation amount at the rotation speed operation end is equal to or greater than the specific operation amount. A hydrodynamic bearing pump system for controlling the power supplied to the pump drive device. In the hydrodynamic bearing pump system according to any one of claims 1 to 11,
The impeller of the dynamic pressure bearing pump is provided with a driven magnet formed of a permanent magnet,
The pump driving device has a rotating magnetic field generating means for generating a rotating magnetic field rotating around the rotation axis while being magnetically coupled to the driven magnet,
The drive control device is a hydrodynamic bearing pump system that controls the rotational speed of the impeller by controlling the rotational speed of the rotating magnetic field. The hydrodynamic bearing pump system according to claim 12,
The rotating magnetic field generating means includes a driving magnet formed of a permanent magnet, and a motor that rotates the driving magnet around the rotation axis while being magnetically coupled to the driven magnet. The hydrodynamic bearing pump system according to claim 12 or 13,
The power control unit has a predetermined operation amount change rate that is an operation amount per unit time of the operation amount at the rotation speed operation end when the operation amount at the rotation speed operation end is equal to or greater than the specific operation amount. When the value exceeds the value, the dynamic pressure for controlling the electric power supplied to the pump drive device so that the rotational speed change rate, which is the rotational speed change amount per unit time of the rotational speed of the rotating magnetic field, becomes a predetermined value. Bearing pump system. A hydrodynamic bearing pump having an impeller and a fixed body formed with a hydrodynamic bearing portion that rotatably supports the impeller around a rotation axis , a suction port for sucking blood, and a discharge port for discharging blood ; A drive controller for a hydrodynamic bearing pump unit, comprising: a pump drive device that rotates an impeller of the hydrodynamic bearing pump according to supplied electric power;
A rotational speed operation end for changing the rotational speed of the impeller;
In the process in which the operation amount at the rotation speed operation end increases from the operation amount 0, in the initial operation section from the operation amount 0 to the predetermined specific operation amount, regardless of the operation amount change in the initial operation section, the Predetermined rotation up to the minimum levitation speed at which the impeller floats up from the hydrodynamic bearing and is supported in a non-contact state on condition that the operation amount at the rotation speed operation end becomes the specific operation amount The electric power supplied to the pump drive device is controlled so that the rotation speed of the impeller increases at a rate of change in the number of revolutions. When the operation amount of the rotation speed operation end is equal to or greater than the specific operation amount, the operation of the rotation speed operation end A power control unit for controlling the power supplied to the pump driving device so that the rotation speed of the impeller corresponds to the amount;
A detection unit for detecting a parameter indicating a driving state of the pump driving device;
In the process in which the power control unit controls the power supplied to the pump driving device so that the rotational speed of the impeller increases at the predetermined rotational speed change rate up to the floating minimum rotational speed, It is determined whether or not the parameter indicating the driving state of the pump driving device detected by the detection unit is within a predetermined normal range, and when it is determined that the parameter is not within the normal range, the power control unit A determination unit for instructing to stop power supply to the pump drive device;
Drive control apparatus Bei Eteiru dynamic bearing pump units. A hydrodynamic bearing pump having an impeller and a dynamic pressure bearing portion that covers the impeller and supports the impeller around a rotation axis, a suction port for sucking blood, and a discharge port for discharging blood ; A pump driving device that rotates the impeller of the hydrodynamic bearing pump according to the supplied electric power, and drives the hydrodynamic bearing pump unit that rotates the impeller according to the operation amount of the rotational speed operation end. In the control method,
In the process in which the operation amount at the rotation speed operation end increases from the operation amount 0, in the initial operation section from the operation amount 0 to the predetermined specific operation amount, regardless of the operation amount change in the initial operation section, the Predetermined rotation up to the minimum levitation speed at which the impeller floats up from the hydrodynamic bearing and is supported in a non-contact state on condition that the operation amount at the rotation speed operation end becomes the specific operation amount The electric power supplied to the pump drive device is controlled so that the rotation speed of the impeller increases at a rate of change in number. When the operation amount at the rotation speed operation end is equal to or greater than the specific operation amount, the operation amount at the rotation speed operation end And controlling the power supplied to the pump drive device so that the rotational speed of the impeller corresponds to
In the process of controlling the power supplied to the pump drive device so that the rotation speed of the impeller increases at the predetermined rotation speed change rate up to the minimum flying speed, the detection unit detects the It is determined whether or not the parameter indicating the driving state of the pump drive device is within a predetermined normal range, and when it is determined that the parameter is not within the normal range, the power to the pump drive device is determined with respect to the power control unit. A drive control method for a hydrodynamic bearing pump unit instructing to stop supply.

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