JP4557532B2 - Swing plate pump - Google Patents

Description

The present invention relates to a wobble plate pump that uses a rotating shaft joint hands to use when the input shaft and the output shaft is bent at an angle at one point.

  Hook joints are known as shaft joints that transmit rotational force when the input shaft and output shaft are bent at an angle at one point, so-called universal joints, but there are problems such as a large number of components There is. A bevel gear can also be used for the same purpose, but since it is a gear, it requires complicated machining, is expensive and requires lubrication, and has problems of generating vibration and noise.

  Patent Document 1 describes a blood pump in which rotation is transmitted to a rotating shaft inclined at a predetermined angle using a bevel gear, and a swing plate is precessed. This will be briefly described with reference to the drawings.

  FIG. 7 is a sectional view showing the blood pump 5a. FIG. 8 is a plan view of the blood pump 5a with the lid removed. 51 is a motor, 52 is a casing, 521 is a casing lid, 53 is a pump chamber, and 54 and 55 are inlets. And an outlet, 522 is a partition wall provided from the side surface of the casing 52 toward the drive shaft to separate the inlet 54 and the outlet 55, 56a is a drive shaft, 56b is an inclined shaft formed in the middle of the drive shaft 56a , 57 is a meshing mechanism to be described later, 58 is a rocking plate attached to the inclined shaft portion 56b via a bearing, 59 is a sealing film covering the rocking plate 58 and covering the inner peripheral surface of the pump chamber 53 It is.

  In this blood pump 5a, an inclined shaft portion 56b is formed in the middle of the drive shaft 56a, and a swing plate 58 is attached thereto via a bearing. The swing plate 58 is disc-shaped, but as shown in FIG. 8, there is a notch 581 at one place, and this is fitted to the partition wall 522 of the casing 52. Further, a bevel gear 575 is attached to the lower surface of the boss portion of the swing plate 58, and a crown gear (bevel gear having a pitch cone angle of 90 degrees) 574 is attached to the bottom surface of the casing 52 for receiving this, thereby constituting an engagement mechanism 57. As shown in the perspective view of FIG. 9, the bevel gear 575 and the crown gear 574 are always meshed at one place. Therefore, even if the drive shaft 56a rotates, the swing plate 58 does not rotate, and the inclined shaft portion. Only precession is performed according to the inclination angle α of 56b.

  The pump chamber 53 formed by the casing 52 and the inner surface of the lid 521 has a shape surrounding the precession motion range of the swing plate 58. Depending on the direction of the inclined shaft portion 56b, the swing plate 58 and the upper and lower surfaces of the pump chamber 53 approach each other leaving a linear minute gap (hereinafter referred to as a linear proximity portion CP) in the diametrical direction. Is spreading. As the drive shaft 56a rotates, the inclined shaft portion 56b also rotates and the CP also rotates, so that a pump action occurs.

  Hereinafter, an example of using this pump as a blood pump will be described with reference to schematic drawings. In FIG. 10, the swing plate 58 is assumed to be in the state shown in FIG. That is, the end portion of the swing plate 58 is below the inflow port 54, and the linear proximity portion CP is at the position of the partition wall 522. The blood B flows into the upper surface of the swing plate 58 in the pump chamber. When the drive shaft rotates 90 degrees counterclockwise, the linear proximity portion CP also moves 90 degrees as shown in FIG. 11, and the blood B enters the pump chamber accordingly. Similarly, when the drive shaft makes one revolution, the state shown in FIGS. When the drive shaft further rotates, blood B is sent out from the outlet 55 as shown in FIG. 15, and all blood B for one rotation is discharged as shown in FIGS. Actually, FIG. 10 and FIG. 14 are in the same state as the pump, so that the subsequent blood B (not shown here) is fed into the back surface of the linear proximity portion CP, and is continuously discharged. The above is the case of blood B on the upper surface of the swing plate 58. For example, in the state of FIG. 12, the linear proximity portion CP on the lower surface of the swing plate 58 is at the position of the partition wall 522, Exactly the same pumping action is performed.

FIG. 18 is a configuration diagram when this blood pump 5a is used as a blood pump of an artificial heart-lung system. The drive shaft of the blood pump 5a is driven to rotate by a motor 51 in accordance with the control of the controller, and the artificial lung is moved from the living aorta Via, the blood flows into the pump chamber from the inlet 54 and is sent back to the aorta of the living body from the outlet 55.
Japanese Patent No. 3305397

The present invention is configured without the occurrence of simple vibration and noise, and to realize a good wobble plate pump a compact efficient by using fewer novel rotary shaft coupling of the maintenance effort.

The rotary shaft joint for the present invention is a rotary shaft joint in which the input shaft and the output shaft are bent at an angle α at one point, and each of the input shaft and the output shaft is replaced with a bevel gear. The angle of elevation of the base of the same pitch cone as that of the bevel gear is α / 2, and a profile in which the outer peripheral portion is developed in the circumferential direction is formed by a periodic waveform curve, and the inner surface thereof is a point on this curve. the formed by the locus of a straight line connecting the vertex of the pitch cones, the vertex portion of said pitch cone yoke obtained by forming a spherical recess centered on the vertices are attached, each of the yoke, bent and The inner surfaces are in contact with each other at the position corresponding to the meshing portion of the bevel gear, and are connected in the axial direction via one sphere that fits into the recess, Preferably, the sphere is integrally formed so as to fit into one of the yokes and the recess, and the periodic waveform curve is composed of 2 to 6 cycles on the entire circumference. It is a rotary shaft coupling.

Wobble plate pump of the present invention, the pivot shaft to perform fitted with a constant inclination angle with respect to the rotation axis when the no precession of the rotary body, a precession around the axis of rotation, A disk-shaped rocking plate attached to the rocking shaft in a radial direction, and the rocking plate and the rocking shaft are supported through a meshing mechanism so as to be rockable and non-rotating. A casing that forms a pump chamber surrounding the precession motion range around the swing axis of the plate and opens the inlet and the outlet, and the inlet and outlet from the inner surface of the casing toward the swing axis The partition mechanism is provided, and the meshing mechanism uses the rotary shaft joint.

  According to the present invention, a new rotary shaft coupling that has a simple configuration, does not generate vibration and noise, and requires less maintenance is realized. There is an excellent effect that the device can be manufactured.

1 is a perspective view showing a rotary shaft joint for the present invention, FIG. 2 is a perspective view showing a yoke on one side, FIG. 3 is a sectional view taken along arrow XX in FIG. 2, 1 is an input shaft, 2 is an output shaft, 3a and 3b are attached to the input shaft 1 and the output shaft 2 as members instead of bevel gears, respectively, and yokes virtually having the same pitch cone as the bevel gears, and 4 is a pair of yokes 3a and 3b. A sphere inserted in between. Yoke 3, the outer peripheral portion 31 a profile which is expanded in the circumferential direction to form a periodic waveform curve, the inner surface 32 formed by the locus of a straight line point between connecting the vertices of the pitch cones on the waveform curve , the apex portion of the pitch cone is constructed by forming a spherical recess 33 centered on the apex.

Figure 4 is a diagram showing a representative at the same pitch cone yoke of the bevel gear in the rotation axis joint for the present invention, the bending angle of the input shaft 1 and output shaft 2 alpha, skirt of the pitch cone Is composed of yokes 3a and 3b in which a spherical recess centered at the apex is formed at the apex portion and a sphere 4 centered at the bending point between the input shaft 1 and the output shaft 2 is, the pitch cone are in contact with each other at the inner surface at the position corresponding to the inner position or engagement portion of the bevel gear bending of the input shaft 1 and output shaft 2.

If the yoke is an ideal friction body, torque can be transmitted by frictional contact with the configuration shown in FIG. 4, but slipping and wear cannot be avoided with actual materials, and large torque can be transmitted at high speed. Can not. The can be reliably transmitted torque if the bevel gears irregularities provided on a pitch cone, generated noise and vibration, also some lubrication, also maintenance problems such wear.

  In the present invention, instead of the bevel gear, the developed profile is a yoke having a waveform curve, and the waveform curve is configured with a small wave number of 2 to 4 cycles on the entire circumference. Furthermore, the peak portion and the valley portion of the waveform curve were each composed of a cycloid curve so that no slip occurred during rolling.

  FIG. 5 shows an example of a development profile of the yoke outer peripheral portion 31. The entire circumference is composed of two cycles with two peaks. The peak portion and the valley portion are each connected by a cycloid curve, and the joint portion is connected by a smooth curve.

The cycloid curve is a locus drawn by a fixed point on the circumference when the circle rolls without sliding along the straight line. A general involute curve as a gear profile is discontinuous on the front and back of the tooth surface, but in the case of a cycloid, both sides including the top have a continuous waveform, and the rotation for the present invention where continuous contact is desired with a small number of peaks. Suitable for shaft couplings. In addition to this, what is generally called a cam curve, such as a modified trapezoidal curve, a modified sine curve, or a trochoid curve, can be used as the waveform curve.

  Increasing the number of cycles, that is, the number of ridges in the entire circumference of the waveform curve, makes the yoke substantially similar to a bevel gear, but in the present invention, the number of ridges is intentionally reduced, facilitating manufacturing and improving strength. I am letting. In the example shown in FIGS. 1 to 3, the number of peaks is 2, and FIG. 5 corresponds to this. If the number of mountains is 1, it will not be in mesh with each other, so it is not realistic. As the number of mountains increases, the width of the mountains decreases and the strength decreases, so the maximum is about 6 mountains, and the two mountains illustrated are the most desirable.

In the rotary shaft joint for the present invention , the spherical body 4 is interposed between the pair of yokes to ensure the transmission of the axial force and the alignment of the cone. Torque is transmitted by rolling contact on the inner surface of the yoke. By adopting a waveform curve such as a cycloid curve, there is almost no problem of wear because it becomes almost perfect rolling contact, but since it operates safely for a long time without lubrication, the yoke itself has low friction with self-lubricating action It is desirable to use a material. On the other hand, hard balls such as steel balls for bearings and ceramic balls are suitable.

  Further, when the yoke 3 is manufactured by injection molding, one yoke 3 can be integrally formed by fitting the spherical body 4 into the concave portion 33, and the number of parts can be reduced.

FIG. 6 is a cross-sectional view of an oscillating plate pump 5 showing an embodiment of the present invention in which the rotary shaft joint for the present invention described above is used for the meshing mechanism 57. The common reference numerals are those described above. 7 is exactly the same as the blood pump 5a of the conventional example, but there is a difference in the portion around the rotation axis and the meshing mechanism. 51 is a motor, 511 is a stator with a coil, and an inner 512 is a rotor having a permanent magnet. Since the swing shaft 56 is attached to the inner side of the rotor 512 with a bearing through an inclination angle, the motor 51 rotates. Then, the swing shaft 56 performs precession. An upper yoke 571 constituting a meshing mechanism 57 and a disc-shaped swing plate 58 are integrally attached to the lower end of the swing shaft 56, while the lower yoke 572 is attached to the bottom of the casing 52. Are integrally formed, and a spherical body 573 is inserted between the upper and lower yokes 571 and 572. The motor 51 and the casing 52 are fixed by a clamp 523, and the swing shaft 56 is pressed downward by a spring 561. Since the oscillating plate 58 cannot rotate because of the meshing mechanism 57, when the rotor 512 rotates, only the precession is performed according to the oscillation of the oscillating shaft 56, and the pump action is performed in the pump chamber 53. This is exactly the same as the conventional blood pump, but in the present invention, the use of a resin yoke instead of a bevel gear for the meshing mechanism eliminates vibration and noise, and almost no maintenance such as replacement due to lubrication or wear is required. It became.

This oscillating plate pump can be used for many purposes, but it can handle both steady flow and pulsating flow, is small and energy efficient, has no retention zone, and has high antithrombogenicity, vibration, noise, etc. Therefore, it is extremely effective when used for a blood pump for medical use such as an artificial heart-lung system or an artificial heart as described in FIG.

It is a perspective view which shows the rotating shaft coupling for this invention. It is a perspective view which shows the yoke of the one side of the rotating shaft coupling for this invention. It is sectional drawing by XX arrow of FIG. It is explanatory drawing which represented the yoke in the rotating shaft coupling for this invention typically with the same pitch cone as a bevel gear . It is an expanded view which shows the profile of the yoke outer periphery part in the rotating shaft coupling for this invention. It is sectional drawing of the rocking | fluctuation plate pump of this invention which uses the rotating shaft coupling for this invention. It is sectional drawing which shows the blood pump in a prior art. FIG. 8 is a plan view of the blood pump in FIG. 7 with a lid removed. It is a perspective view which shows the meshing mechanism of the blood pump in a prior art. It is a schematic diagram explaining the pump action of the blood pump in a prior art. It is a schematic diagram explaining the pump action of the blood pump in a related art similarly. It is a schematic diagram explaining the pump action of the blood pump in a related art similarly. It is a schematic diagram explaining the pump action of the blood pump in a related art similarly. It is a schematic diagram explaining the pump action of the blood pump in a related art similarly. It is a schematic diagram explaining the pump action of the blood pump in a related art similarly. It is a schematic diagram explaining the pump action of the blood pump in a related art similarly. It is a schematic diagram explaining the pump action of the blood pump in a related art similarly. It is a block diagram of the heart-lung machine system using the blood pump in a prior art.

Explanation of symbols

1 Input shaft 2 Output shaft 3, 3a, 3b, 571, 572 Yoke 4, 573 Ball 5 Oscillating plate pump
5a blood pump
31 Outer part
32 inner surface
33 recess
51 motor
52 Casing
53 Pump room
54 Inlet
55 Outlet
56 Oscillating shaft
56a Drive shaft
56b Inclined shaft
57 Intermeshing mechanism
58 Swing plate
59 Sealing membrane
511 stator
512 rotor
521 lid
522 Bulkhead
523 Clamp
561 Spring
574 Crown gear
575 Bevel gear
581 cutout

Claims (3)

Mounted with a certain inclination angle with respect to the rotation axis when the no precession of the rotary body, wherein a swing axis precess about an axis of rotation (56), the pivot shaft (56 ) And a rocking plate (58) mounted in the radial direction to the rocking plate (58) and the rocking shaft (56) via a meshing mechanism (57). The pump chamber (53) that surrounds the range of precession around the rocking shaft (56) of the rocking plate (58) is formed and the inlet (54) and the outlet (55) are opened. And a partition wall (522) that partitions the inlet (54) and the outlet (55) from the inner surface of the casing (52) toward the swing shaft (56), An oscillating plate pump characterized in that the meshing mechanism (57) uses the rotary shaft coupling of [1] below .
Record
[1] A rotary shaft joint in which an input shaft (1) and an output shaft (2) are bent at an angle α at one point, and an umbrella is provided on each of the input shaft (1) and the output shaft (2). As a member that replaces the gear, the angle of elevation of the base of the same pitch cone as that of the bevel gear is α / 2, and a profile in which the outer peripheral portion (31) is developed in the circumferential direction is formed with a periodic waveform curve, The inner surface is formed by a linear locus connecting a point on the curve and the apex of the pitch cone, and a spherical concave portion (33) centering on the apex is formed at the apex portion of the pitch cone. The yokes (3a, 3b) are attached, and the inner surfaces (32) are in contact with each other at the inner position of the bend, that is, at the position corresponding to the meshing portion of the bevel gear, and the recesses One sphere that fits into (33) Rotary shaft coupling, characterized in that connected to the axial direction) through the.   The rocking plate pump according to claim 1, wherein the spherical body (4) is integrally formed so as to be fitted to one of the yokes (3a, 3b) and the recess (33).   The oscillating plate pump according to claim 1 or 2, wherein the periodic waveform curve is constituted by 2 to 6 cycles on the entire circumference.

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