JP2010007615A - Tube unit, control unit, and micropump provided with them - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a micropump from which a tube unit and a control unit can be removed. <P>SOLUTION: The micropump 1 is provided with a tube unit 2 which includes an elastic tube 50, fingers 40-46, a tube guide frame 17 retaining the tube 50 and the fingers 40-46, and a third machine frame 16; and a control unit 3 which includes a cam 20, a rotor 70 transmitting torque to the cam 20, and piezoelectric elements 82, 83, and includes a vibrator 80 including a projection 81a at a longitudinal direction end, a control circuit 60, a battery 61, a first machine frame 14 retaining the cam 20, the rotor 70, the vibrator 80, the control circuit 60, and the battery 61, and a second machine frame 15. The tube unit 2 and the control unit 3 can be removed. The vibrator 80 vibrates when alternating voltages are applied to the piezoelectric elements 82, 83. Torque is applied to the rotor 70 from the projection 81a. The cam 20 sequentially presses the fingers 40-46 to transport liquid. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a tube unit, a control unit, and a micro pump configured by detachably coupling them.

  There is a peristaltic pump as a device for transporting liquid at low speed. As a peristaltic drive pump, a step motor is used as a drive source, a rotor having a plurality of rollers is rotated, and the rotor rotates along a flexible tube while rolling the plurality of rollers to suck and discharge liquid. The structure which performs is known (for example, patent document 1).

  In addition, such a pump is assembled by stacking a pump module including a tube and a rotor for closing the tube, and a motor module having a step motor and an output gear mechanism. A gear is provided, and the output gear mechanism is provided with a pinion as a power take-out mechanism. When the pump module and the motor module are stacked and connected, the pinion and the gear are connected (meshed), and the rotational driving force of the step motor Is transmitted to the rotor.

Japanese Patent No. 3177742

  According to the configuration of Patent Document 1, since the tube is closed with a roller for a long time from the manufacture (assembly) of the pump module to the start of use, the restoring force of the tube is reduced, and the discharge accuracy is reduced. Has the problem of lowering.

  In general, the diameter of the tube has a large variation, and this variation becomes a variation in the amount of closed tube pressure, and the discharge accuracy cannot be obtained. Moreover, it may lead to an overload of a small motor as a drive source, so that a desired drive performance cannot be obtained, and in the worst case, it cannot be driven.

  Also, a step motor is adopted as a drive source, and a motor module including a step motor, an output gear mechanism and a control circuit, a rotor including a tube and a roller, and a pump module including a coupling element are mounted in an overlapping manner. Thinning is difficult.

  Further, when the step motor is reduced in size, the driving torque is reduced. Therefore, it is necessary to increase the rotational torque of the rotor using a reduction mechanism (reduction gear mechanism) having a large reduction ratio. Therefore, a multi-stage reduction gear mechanism is used, resulting in an increase in size and a problem of increased loss due to deceleration.

  Further, it is known that the step motor generates electromagnetic noise, and it is considered that the step motor itself is affected by the electromagnetic noise of the surrounding equipment, in addition to the adverse influence on the surrounding equipment.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

  [Application Example 1] A micropump according to this application example includes a tube having a part thereof arranged in an arc shape and having elasticity, a plurality of fingers arranged radially from the center direction of the arc shape of the tube, A tube unit having a tube and a guide frame that holds the plurality of fingers, a cam whose arcuate center and a rotation axis substantially coincide with each other, a rotor that transmits a rotational force to the cam, and a piezoelectric element A vibration body having a protrusion that contacts the rotor at a longitudinal end, a control circuit section that is supplied with electric power from a power supply section and applies an AC voltage to the piezoelectric element, the cam, the rotor, and the rotor A control unit having a vibrating body and a machine frame that holds the control circuit unit, and the tube unit and the control unit are mounted in a stacked manner and are detachable. Then, when the AC voltage is applied to the piezoelectric element, the vibrating body vibrates, the rotational force is repeatedly applied from the protrusion to the rotor, and the cam moves the plurality of fingers from the fluid inflow side to the outflow side. The fluid is transported by sequentially pressing and repeatedly pressing and releasing the tube.

  If the tube is kept in the pressure-closed state for a long time, it is considered that the restoring force of the tube deteriorates and the discharge accuracy decreases. However, according to this application example, since the tube and a plurality of fingers are unitized and separated from the cam, the tube is kept open in the tube unit state, so that the tube is closed. It is possible to prevent a decrease in discharge accuracy due to the accompanying deterioration in restoring force.

  Moreover, it is conceivable that repeating the capping and opening of the tube for a long time may deteriorate the restoring force of the tube, but the tube can be easily replaced as a tube unit.

  In addition, since the tube pressure closing amount can be adjusted by adjusting the length of the finger for each tube unit with respect to the variation in the tube diameter, there is an effect that it is easy to guarantee the discharge accuracy.

  Moreover, since the tube unit is comprised with the several finger and tube with respect to the control unit containing a cam, a rotor, a vibrating body, a control circuit part, and a power supply part, cost is also cheap. Therefore, if the control unit is used repeatedly and is used disposable for each liquid (medical solution) using the tube unit and for each use target (for example, for each individual), the running cost can be reduced.

  Further, in this application example, the rotor (cam) is rotated using the vibration of the vibrating body as a rotational drive source of the cam. Although described in detail in the embodiments, the rotor driven by the vibrating body has a large rotational torque, and therefore does not require a reduction gear mechanism as in the prior art. In addition, a connection mechanism between the motor module and the pump module is not required, the structure is simplified, and a small and thin micro pump can be realized because the drive source is a vibrating body.

  In addition, the vibrating body vibrates by applying an AC voltage to the piezoelectric element and rotates the rotor, so that no electromagnetic noise is generated and no adverse effects are exerted on surrounding equipment. It is not affected by. Therefore, it is possible to avoid the risk of electromagnetic noise, particularly in the medical field.

  Application Example 2 In the micropump according to the application example, the cam, the rotor, and the vibrating body are disposed in a space formed by the guide frame and the machine frame, and the control circuit unit and the power source It is preferable that at least one of the portions is disposed on the opposite side of the machine frame with respect to the space.

  According to such a configuration, since the members that are mechanically driven are disposed in the space, it is not necessary to use a connecting member for mutual connection, and the structure can be simplified.

  Application Example 3 In the micropump according to the application example, the cam, the rotor, the vibrating body, the control circuit unit, and the power supply unit are arranged in a space constituted by the guide frame and the machine frame. It is preferable that

  According to such a configuration, since the members related to the driving of the micropump are disposed in the space, there is an effect that it is possible to realize a reduction in thickness.

  Application Example 4 In the micropump according to the application example described above, it is preferable that the rotor has a disk shape and the protrusion is disposed so as to abut on the outer peripheral side surface of the rotor.

  Although described in detail in the embodiment, the micropump of this application example has a structure in which the rotor is rotated by using the vibrating body and the cam is rotated, and the friction force (pressing force) between the protrusion and the rotor is used. Since the rotor is driven, the driving force is high unlike the case of driving with a magnetic force as in the step motor of the prior art. In addition, by contacting the protrusion of the vibrating body with the outer peripheral surface of the rotor having a large diameter, the rotational torque of the rotor can be increased when the same vibrating body is vibrated under the same conditions, so that stable driving can be continued.

  Application Example 5 In the micropump according to the application example described above, it is preferable that the rotor has a ring shape, and the protrusion is disposed so as to abut on a ring-shaped inner peripheral side surface of the rotor.

  With this configuration, the vibrating body is disposed on the inner side of the outer diameter of the rotor, so that further downsizing can be realized.

  Application Example 6 In the micropump according to the application example described above, the rotor is formed in a recess formed in one plane of the cam, and the protrusion comes into contact with an inner peripheral side surface of the recess. It is desirable that they are arranged as described above.

  In such a configuration, the rotor can be formed integrally with the cam inside the cam. Therefore, the structure can be simplified and the size can be reduced.

  Application Example 7 In the micropump according to the application example described above, it is preferable that the rotation axis of the rotor coincides with the rotation axis of the cam.

  In such a configuration, since the rotor and the cam are provided on the same axis, the connection mechanism as in the prior art described above is unnecessary, and the micropump can be further downsized.

  Application Example 8 In the micropump according to the application example described above, a groove along the rotation direction is provided on the contact surface of the rotor with the protrusion, and the protrusion is in contact with the inner side surface of the groove. It is desirable that they are arranged.

  By providing the grooves in the rotor in this manner, it is possible to prevent the thin plate-like vibrating body from being detached from the contact surface due to external vibration, impact, or the like. In addition, since the contact position in the cross-sectional direction between the protrusion and the contact surface is substantially constant, there is an effect that the driving force from the vibrating body to the rotor is stabilized.

  [Application Example 9] In the micropump according to the application example described above, the vibrating body, the control circuit unit, and the power supply unit are distributed at positions where the tube, the cam, and the fingers do not overlap with each other in a plane. It is desirable that it is installed.

  In this way, the micropump can be made thinner because the control circuit unit, the power supply unit, and the vibrating body are disposed so as not to overlap the tube, the cam, and the fingers in plan view. Also. Since the small-sized vibrating body is dispersedly arranged with the plurality of fingers and tubes, the assemblability can be improved.

  Application Example 10 In the micropump according to the application example, it is preferable that the power supply unit is detachable independently in a state where the tube unit and the control unit are mounted.

  When a vibrating body including a piezoelectric element is used as a driving source, there is almost no deterioration due to driving, and it has excellent durability and can be used for a long time. However, at that time, when a small battery is used as the power source, it is expected that the battery capacity will be insufficient during the period of use. Thus, if the power supply unit can be easily replaced independently, the micropump can be used continuously for a long time.

  Further, in the configuration in which the cam, the rotor, and the vibrator described above are arranged in a space constituted by the guide frame and the machine frame, and the power supply unit is arranged on the opposite side of the machine frame with respect to the space, Since the power supply unit can be replaced in a completed state as a micropump, the trouble of disassembling and taking out the power supply unit can be eliminated, and the problem that the mechanical drive member is damaged at the time of replacement can be eliminated.

  Application Example 11 In the micropump according to the application example described above, it is preferable that the power supply unit is detachable independently in the state of the control unit.

  In the configuration in which the cam, the rotor, the vibrator, the control circuit unit, and the power supply unit are disposed in the space formed by the guide frame and the machine frame, the power supply unit is in the state of the control unit according to the replacement timing of the tube unit. Can be replaced independently, and the trouble of taking out the power supply unit can be eliminated, and the problem that the mechanical drive member is damaged at the time of replacement can be eliminated.

  Application Example 12 In the micropump according to the application example described above, it is preferable that a speed reduction mechanism or a speed increase mechanism is provided between the rotor and the cam.

  Thus, the rotational speed of the cam can be changed by providing the speed reduction mechanism or speed increasing mechanism. That is, the amount of fluid flow can be adjusted as appropriate. In the above configuration, the speed reduction mechanism or speed increase mechanism is disposed in the control unit.

  Application Example 13 In the tube unit according to this application example, a cam that is partially arranged in an arc shape and has an elastic tube whose center is substantially coincident with the center of the arc shape and a rotational force is transmitted to the cam. A rotor, a vibration element having a piezoelectric element and having a protrusion that contacts the rotor at a longitudinal end; a control circuit unit that applies an AC voltage to the piezoelectric element; a power supply; the cam; and the rotor And a control unit consisting of a machine frame that holds the vibrating body, the control circuit unit, and the power supply unit, and is detachable from the center of the tube and the arc shape of the tube. A plurality of fingers, and a guide frame that holds the tubes and the fingers.

  According to this application example, since the tube and a plurality of fingers are unitized and separated from the cam, the tube is kept open in the state of the tube unit, so that it is restored along with the tube crushing. It is possible to prevent the discharge accuracy from being lowered due to the force deterioration.

  In addition, the tube unit and the control unit can be attached and detached. When flowing chemicals, etc., it is reliable if the tube unit that directly contacts the chemicals or includes a tube with low durability is used for updating. Can be increased. In addition, since the tube unit has few components and can be reduced in cost, the running cost can be reduced.

  [Application Example 14] A control unit according to this application example includes a tube having a part thereof arranged in an arc shape and having elasticity, a plurality of fingers arranged radially from the center direction of the arc shape of the tube, A tube unit having a tube and a guide frame that holds the plurality of fingers, is detachable from the tube, and a cam whose arcuate center and a rotation axis substantially coincide with each other, and a rotational force is transmitted to the cam. A rotor, a vibration element having a piezoelectric element and having a protrusion that contacts the rotor at a longitudinal end; a control circuit unit that applies an AC voltage to the piezoelectric element; a power supply; the cam; and the rotor And a machine frame that holds the vibrating body, the control circuit unit, and the power supply unit.

  According to this application example, the tube unit and the control unit are detachable, the tube unit is used for renewal each time, and the control unit having many components with respect to the tube unit can be used repeatedly. .

  In addition, since the control unit includes a vibrating body, a rotor, and a cam as a driving source, the driving system from the vibrating body to the cam has a stable engagement state without separating the vibrating body from the cam. It can be configured.

  Application Example 15 In the control unit according to the application example, the cam, the rotor, the vibrating body, the control circuit unit, and the power supply unit are disposed on the tube unit side of the machine frame. Is preferred.

  According to such a configuration, the cam, the rotor, the vibrator, the control circuit unit, and the power supply unit are disposed on the one surface side of the machine frame, so that the assemblability can be improved and the thickness can be reduced.

  Application Example 16 In the control unit according to the application example, the cam, the rotor, and the vibrating body are disposed on the tube unit side of the machine frame, and at least one of the control circuit unit and the power supply unit. However, it is preferable that the tube unit is disposed on the opposite side of the machine frame.

  According to such a configuration, the planar layout design is facilitated by disposing the cam, the rotor, the vibrating body, and the control circuit unit or the power source unit on both the front and back surfaces of the machine frame. In addition, it is possible to realize a structure that is easy to miniaturize in a plane.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 6 show the micropump according to the first embodiment, FIGS. 7 and 8 show the second embodiment, FIG. 9 shows the third embodiment, FIG. 10 shows the fourth embodiment, and FIG. 11 shows the fifth embodiment.
Note that the drawings referred to in the following description are schematic views in which the vertical and horizontal scales of members or portions are different from actual ones for convenience of illustration.
(Embodiment 1)

First, the overall configuration of the micropump of the present invention will be described.
1A and 1B show a micropump according to a first embodiment, where FIG. 1A is a plan view and FIG. 1B is a front view. In FIG. 1, the micropump 1 includes a drive unit 10 and a reservoir 11 that stores liquid.

  The drive unit 10 is mounted with the tube unit 2 and the control unit 3 overlapped. The tube unit 2 includes a tube guide frame 17 and a third machine frame 16 as a guide frame for holding a tube 50 and a plurality of fingers (not shown). Further, the control unit 3 includes a first machine casing 14 and a second machine casing 15 as machine frames for holding a cam, a rotor, a vibrating body, a control circuit unit, and a power supply unit (both not shown). .

  The tube unit 2 and the control unit 3 are mounted in an overlapping manner in the thickness direction to constitute the drive unit 10, but are detachable. In addition, as shown to Fig.1 (a), attachment with the tube unit 2 and the control unit 3 has illustrated the structure fixed with the three fixing screws 91 in this embodiment. A sealed space is formed inside the tube unit 2 and the control unit 3 in a state in which the peripheral edge portion is tightly fixed by the fixing screw 91, and the space is waterproof.

  The reservoir 11 is placed in a recess provided on the upper surface side of the first machine casing 14, and is connected to the drive unit 10 by a tube 50. The reservoir 11 is made of a flexible material, and is deformed by the external atmospheric pressure when the internal liquid flows out, so that the internal pressure of the reservoir 11 is kept constant.

  The liquid stored in the reservoir 11 is discharged from the outlet part 53 by repeatedly closing and releasing the tube 50 by the peristaltic motion of the driving part 10.

Next, the configuration of the drive unit 10 will be described with reference to the drawings.
FIG. 2 is a plan view showing the configuration of the drive unit, and FIG. 3 is a cross-sectional view showing the A-P-B section of FIG. In FIG. 2, the third machine casing 16 is not shown.

  First, the planar configuration will be described with reference to FIG. The drive unit 10 includes a tube 50 that is partly arranged in a circular arc shape in plan view and has elasticity, a cam 20 in which the center of the circular arc shape of the tube 50 and the rotation axis P substantially coincide with each other, and an arc-shaped portion of the tube 50 A plurality of fingers 40 to 46 that are interposed between the rotary shaft P and radially spaced from the rotation axis P, a disk-shaped rotor 70 that transmits rotational force to the cam 20, and a rotor The vibrating body 80 is disposed so that the protrusion 81 a contacts the outer peripheral portion of the 70, the control circuit portion 60, and a battery 61 as a power supply portion. In the present embodiment, the battery 61 is preferably a small button type battery for miniaturization.

  The cam 20 and the rotor 70 are fixed to the cam shaft 75. Therefore, the cam 20 and the rotor 70 are configured to rotate integrally with the same rotation axis P.

  Each of the control circuit unit 60, the battery 61, and the vibrating body 80 is distributed and disposed at positions that do not overlap the tube 50, the cam 20, and the fingers 40 to 46 in a planar manner.

  The cam 20 has irregularities in the outer peripheral direction, and finger pressing surfaces 21a to 21d are formed on the outermost peripheral portion. The finger pressing surfaces 21 a to 21 d are formed on concentric circles equidistant from the rotation axis P.

  Moreover, the circumferential pitch and outer shape of the finger pressing surface 21a and the finger pressing surface 21b, the finger pressing surface 21b and the finger pressing surface 21c, the finger pressing surface 21c and the finger pressing surface 21d, and the finger pressing surface 21d and the finger pressing surface 21a Are equally formed.

Each of the finger pressing surfaces 21a to 21d is formed with a finger pressing inclined surface 22 and a concentric circular arc portion 23 centering on the rotation axis P. The arc portion 23 is provided at a position where the fingers 40 to 46 are not pressed.
Further, one end of each of the finger pressing surfaces 21a, 21b, 21c, and 21d and the arc portion 23 are connected by a linear portion 24 that extends from the rotation axis P.

  The tube 50 is inserted into a tube guide groove 17 b formed in the tube guide frame 17, and one end portion is an outlet portion 53 that discharges the liquid to the outside, and protrudes toward the outside of the micropump 1. Yes. The other end is an inflow port portion 52 into which liquid flows in, and is connected to the reservoir 11 that stores the liquid, and the liquid flow portion 51 is communicated with the reservoir 11.

  The tube 50 is mounted in a tube guide groove 17b formed so that the range pressed by the fingers 40 to 46 is concentric with the rotation axis P. Since the fingers 40 to 46 are formed in the same shape, the finger 44 will be described as an example. The finger 44 includes a columnar shaft portion 44a, a bowl-shaped tube pressing portion 44c provided at one end portion of the shaft portion 44a, a cam contact portion 44b whose other end portion is rounded into a hemisphere, It is composed of

  The fingers 40 to 46 can move forward and backward along the finger guide groove 17 a and are pressed outward by the cam 20 to close the tube 50 and close the liquid flow portion 51. The center positions of the fingers 40 to 46 in the cross-sectional direction substantially coincide with the center of the tube 50.

Next, a cross-sectional configuration of the drive unit 10 will be described with reference to FIG.
The tube unit 2 has fingers 40 to 46 (finger 44 illustrated) inserted into seven finger guide grooves 17a having a U-shaped cross-section formed on the peripheral edge of the tube guide frame 17, and has a cross-sectional shape. The tube 50 is inserted into the U-shaped tube guide groove 17b, and the third machine casing 16 that holds the fingers 40 to 46 and the tube 50 from above in the figure.

  After inserting the fingers 40 to 46 and the tube 50 into the finger guide groove 17a and the tube guide groove 17b, respectively, the upper surface thereof (the open side of each groove) is covered with the third machine frame 16, and the tube guide frame 17 and the tube guide groove 17b. The tube unit 2 is configured by tightly fixing the contact surfaces of the three machine frames 16 with each other. In addition, the tube guide wall 17c is provided in the outer side direction of the tube guide groove 17b, and the movement of the tube 50 is regulated when the tubes 40 to 46 are closed.

  In the tube unit state, the fingers 40 to 46 can move forward and backward along the finger guide groove 17 a and are present at positions where the tube 50 is not closed by the elastic force of the tube 50.

  In the control unit 3, the cam 20, the rotor 70, and the vibrating body 80 are disposed on the upper surface side of the second machine casing 15, and the control circuit unit 60 and the battery 61 are disposed on the lower surface side of the second machine casing 15. It is installed and configured.

  The cam 20 and the rotor 70 are axially fixed to the cam shaft 75. Therefore, the cam 20 and the rotor 70 can rotate integrally with the cam shaft 75 as a rotation axis. The cam shaft 75 has shaft portions 75a and 75b at both ends.

  The shaft portion 75 a is inserted into a bearing 92 provided in the fourth machine casing 18, and the shaft portion 75 b is inserted into a bearing 93 provided in the second machine casing 15 and is pivotally supported by the bearings 92 and 93.

  The position of the fourth machine casing 18 is restricted by the fourth machine casing guide shaft 106 planted on the second machine casing 15 at the peripheral edge other than the position where the cam 20 (the rotor 70) and the vibrating body 80 are disposed. At the same time, it is fixed to the second machine casing 15 by the fixing screw 107 (see also FIG. 2).

  When the tube unit 2 is mounted on the control unit 3 from above, the cam 20 has an outer peripheral surface (finger pressing surface 21d) in which the cam contact portions of the fingers 40 to 46 (the cam contact portion 44b are exemplified) are uneven. And a finger guide surface 28 for guiding the circular arc portion 23 to a position in contact with the arc portion 23).

  A groove 71 is formed in the outer peripheral portion of the rotor 70 along the rotation direction, and an inner side surface of the groove 71 is a contact surface 72 with the vibrating body 80.

  The vibrating body 80 is disposed substantially at the center in the cross-sectional direction of the groove 71 of the rotor 70, and the arm portion 81 c is fixed to the vibrating body fixing shaft 90 planted in the second machine casing 15 by a fixing screw 98. ing. The vibrating body 80 will be described with reference to FIGS.

  A circuit board 63 is provided on the back surface (the lower surface in the drawing) opposite to the space 30 of the second machine casing 15, and extends from the lower surface of the battery 61 to below the vibrating body 80. Is formed. A control circuit unit 60 and a battery 61 are placed or connected to the upper surface of the circuit board 63.

  The control circuit unit 60 includes a power supply circuit, an oscillation circuit, and the like (both not shown). The power supply circuit is connected to the electrode of the battery 61, and the oscillation circuit is connected to the plurality of electrodes of the vibrating body 80.

  The surface of the battery 61 in contact with the circuit board 63 is a negative electrode, the side surface is a positive electrode, and the negative electrode is directly connected to the connection pattern. Further, the plus electrode is connected to the corresponding connection pattern via the battery terminal 62 (see FIG. 2).

  On the back side of the second machine casing 15, the first machine casing 14 is disposed so as to cover the control circuit unit 60 and the battery 61. The first machine casing 14 and the second machine casing 15 are firmly fixed at their contact surfaces.

  The battery 61 is held in a recess formed in the first machine casing 14 with its position in the plane direction regulated. On the other hand, a battery lid 19 is provided in the direction of one end face of the battery 61. A screw part 19 b is formed on the outer peripheral protrusion of the battery lid 19, and is screwed to a female screw formed on the first machine casing 14.

  An opening / closing groove 19 a is formed in the battery lid 19, and the battery lid 19 can be opened and closed by inserting and rotating a driver, a coin or the like in the opening / closing groove 19 a. That is, the battery 61 is removed, the battery 61 is taken out, the battery 61 is attached, and the battery cover 19 is tightened to press the battery 61 on the circuit board 63. At this time, the battery lid 19 and the second machine casing 15 are in close contact with each other.

  The battery lid 19 can be selected from an open / close structure such as a bayonet structure, a press-fit structure, and a fixed screw structure in addition to the screwing and fixing.

  As described above, the cam 20, the rotor 70, the vibrating body 80, and the fourth machine casing 18 are configured by the guide frame (the tube guide frame 17 and the third machine casing 16) and the machine casing (the second machine casing 15). The space 30 is disposed inside and sealed.

  The drive unit 10 is mounted with the tube unit 2 overlapped on the control unit 3, but when the tube unit 2 is a single unit, the fingers 40 to 46 move in a direction approaching the cam 20 by the elastic force of the tube 50 (virtual). A finger 44 'indicated by a line is illustrated). At this time, the cam contact portion 44 b is in a positional relationship to ride on the finger guide surface 28 of the cam 20.

  Here, when the tube unit 2 is pushed down to the control unit 3 side, the cam contact portion 44b slides along the finger guide surface 28, and the finger 44 moves to the tube 50 side due to the slope effect of the finger guide surface 28. . When the finger 44 reaches the finger pressing surface 21d (or 21c) that is the outer peripheral surface of the cam 20, the tube unit 2 is attached to the control unit 3 at a predetermined position.

Next, the vibrating body 80 will be described with reference to the drawings.
FIG. 4 is a perspective view showing the configuration of the vibrating body. As shown in FIG. 4, the vibrating body 80 has a substantially rectangular thin plate shape. In the vibrating body 80, a plate-like piezoelectric element 82 is formed on the surface of the reinforcing plate 81, an electrode 84 is laminated on the surface of the piezoelectric element 82, a plate-like piezoelectric element 83 is laminated on the back surface, and an electrode 85 is laminated on the surface of the piezoelectric element 83. Is formed.

  The piezoelectric elements 82 and 83 each have a rectangular shape, and expand and contract in the longitudinal direction by applying an alternating voltage. The materials of the piezoelectric elements 82 and 83 are not particularly limited, and lead zirconate titanate (PZT), crystal, lithium niobate, barium titanate, lead titanate, lead metaniobate, polyvinylidene fluoride, lead zinc niobate , Lead scandium niobate and the like can be used.

  The reinforcing plate 81 has a function of reinforcing the entirety of the vibrating body 80, and prevents the vibrating body 80 from being damaged by over-amplitude or external force. Although it does not specifically limit as a material of the reinforcement board 81, For example, it is desirable that they are metal materials, such as stainless steel, aluminum or an aluminum alloy, titanium or a titanium alloy, copper or a copper-type alloy.

  The piezoelectric elements 82 and 83 are preferably thinner than the reinforcing plate 81. Thereby, the vibrating body 80 can be vibrated with higher efficiency.

  The reinforcing plate 81 also has a function as a common electrode for the piezoelectric elements 82 and 83. That is, an AC voltage is applied to the piezoelectric element 82 by the electrode 84 and the reinforcing plate 81, and an AC voltage is applied to the piezoelectric element 83 by the electrode 85 and the reinforcing plate 81.

  The piezoelectric elements 82 and 83 repeatedly expand and contract in the longitudinal direction when an AC voltage is applied, and accordingly, the reinforcing plate 81 repeatedly expands and contracts in the longitudinal direction. That is, when an AC voltage is applied to the piezoelectric elements 82 and 83, the vibrating body 80 vibrates with a minute amplitude in the longitudinal direction as indicated by an arrow in FIG.

  Protrusions 81a and 81b are integrally formed at both ends of the reinforcing plate 81, respectively. As shown in FIGS. 2 and 3, the vibrating body 80 is disposed so that the protrusion 81 a contacts the outer peripheral side surface (contact surface 72) of the rotor 70.

Next, the operation of the vibrating body 80 will be described with reference to the drawings.
FIG. 5 is a partial plan view schematically showing the action of the vibrating body, and FIG. 6 is an explanatory view schematically showing the movement of the protrusion. In FIG. 5, the protrusion 81 a is provided at a position (corner in the illustrated configuration) that is shifted from the center (center line G) of the reinforcing plate 81.

  Further, in the configuration shown in the figure, a protrusion 81b similar to the protrusion 81a is provided at the opposite corner, but this is not used in the present embodiment.

  Further, an arm portion 81 c is projected from substantially the center in the longitudinal direction of the reinforcing plate 81. A fixing hole 81d is formed at the tip of the arm portion 81c, and a fixing screw 98 (see FIG. 3) is inserted into the fixing hole 81d.

  As shown in FIG. 3, the vibrating body 80 is fixed by a fixing screw 98 to a vibrating body fixing shaft 90 planted in the second machine casing 15 in the arm portion 81 c. That is, the vibrating body 80 is supported by the arm portion 81c. Thereby, the vibrating body 80 can vibrate freely and vibrates with a relatively large amplitude.

  The vibrating body 80 is disposed in a state where the protrusion 81 a is pressed against the contact surface 72 on the outer peripheral side surface of the rotor 70 by the elasticity of the arm portion 81 c.

  In addition, the vibrating body 80 is disposed in a posture substantially parallel to the rotor 70 in the cross-sectional direction and is thinner than the thickness of the rotor 70. Further, the thickness of the vibrating body 80 is more preferably made thinner than the width of the groove 71 formed in the outer peripheral surface of the rotor 70 in the cross-sectional direction.

  As described above, when an AC voltage is applied to the piezoelectric elements 82 and 83, the vibrating body 80 expands and contracts, and the protrusion 81a repeats elliptical motion as indicated by the arrow r in FIG.

  Therefore, when the vibrating body 80 is vibrated by applying an alternating voltage to the piezoelectric elements 82 and 83 in a state where the protrusion 81a is in contact with the contact surface 72 of the rotor 70, the vibrating body 80 is expanded. The rotor 70 receives frictional force (pressing force) from the protrusion 81a, and the rotor 70 rotates in the clockwise direction (arrow R) by repeating this pressing force.

  The frequency applied to the piezoelectric elements 82 and 83 is not particularly limited, but is preferably approximately the same as the resonance frequency of vibration (longitudinal vibration) of the vibrating body 80. Thereby, the amplitude of the vibrating body 80 becomes large, and the rotor 70 can be rotationally driven with high efficiency.

  The vibrating body 80 mainly longitudinally vibrates in the longitudinal direction, but it is more preferable to resonate the longitudinal vibration and the bending vibration and cause the protrusion 81a to elliptically vibrate. Thereby, the rotor 70 can be rotationally driven with higher efficiency. Hereinafter, this point will be described.

  As shown in FIG. 5, when the vibrating body 80 rotationally drives the rotor 70, the protrusion 81 a receives a reaction force f represented by an arrow in FIG. 5 from the rotor 70. In the present embodiment, the protrusion 81 a is provided at a position shifted from the center line G of the vibrating body 80. Accordingly, the vibrating body 80 is deformed and vibrated by the reaction force f so as to bend in the in-plane direction as shown in FIG. In FIG. 5, the deformation of the vibrating body 80 is exaggerated.

  By appropriately selecting the frequency of the applied voltage, the shape / size of the vibrating body 80, the position of the protrusion 81a, etc., the frequency of the bending vibration and the frequency of the longitudinal vibration resonate, the amplitude increases, and the protrusion 81a is displaced (ellipse vibration) substantially along an ellipse as shown by an arrow r in FIG.

  Accordingly, when the protrusion 81a sends the rotor 70 in the rotation direction with one amplitude of the vibrating body 80, the protrusion 81a is pressed against the rotor 70 with a strong force, and when the protrusion 81a returns, Since the frictional force can be reduced or eliminated, the vibration of the vibrating body 80 can be converted with higher efficiency than the rotation of the rotor 70.

  Next, the operation relating to the transport of the liquid according to the present embodiment will be described with reference to FIG. The cam 20 is rotated via the rotor 70 by the driving force from the vibrating body 80 (shown in the direction of arrow R) and presses the finger 44 with the finger pressing surface 21 d of the cam 20.

  The finger 45 is in contact with a joint portion between the finger pressing surface 21d and the finger pressing slope 22 and closes the tube 50. In addition, the finger 46 presses the tube 50 on the finger pressing slope 22, but the finger 46 is smaller than the pressing amount of the finger 44 and does not completely close the tube 50.

  The fingers 41 to 43 are in the range of the arc portion 23 of the cam 20 and are in an initial position where they are not pressed. In addition, the finger 40 is in contact with the finger pressing slope 22 of the cam 20, but the tube 50 is not yet closed at this position.

  When the cam 20 is further rotated in the direction of arrow R from this position, the fingers 50 and 46 are pressed in this order by the finger pressing surface 21d of the cam 20, and the tube 50 is closed. The finger 44 is released from the finger pressing surface 21d, and the tube 50 is opened. The liquid flows into the liquid flow part 51 of the tube 50 at a position where the pressure-closure is released from the finger or a position where the pressure-close is not yet closed.

When the cam 20 is further rotated by the vibrating body 80, the finger pressing slope 22 is sequentially pressed from the liquid inflow side to the outflow side in the order of the fingers 40, 41, 42, 43, and reaches the finger pressing surface 21c. The tube 50 is closed.
By repeating such an operation, the liquid flows from the inlet portion 52 side toward the outlet portion 53 side and is discharged from the outlet portion 53.

  At this time, two of the plurality of fingers come into contact with the finger pressing surface of the cam 20, and when moving to a position where the next finger is pressed, one of the fingers is pressed. Thus, by repeating the state of pressing two fingers and the state of pressing one finger, a state in which at least one finger always press-closes the tube 50 is formed. Such a structure of the micropump by the movement of a plurality of fingers is called a peristaltic drive system.

  According to the above-described embodiment, since the tube 50 and the fingers 40 to 46 are unitized and separated from the cam 20, the tube 50 is kept open in the state of the tube unit 2, It is possible to prevent the discharge accuracy from being lowered due to the deterioration of the restoring force caused by keeping the tube 50 closed for a long time.

  In addition, repeated restoring and closing of the tube 50 for a long time also deteriorates the restoring force of the tube 50. The tube 50 can be easily replaced as the tube unit 2.

  Moreover, by adjusting the length of the fingers 40 to 46 for each tube unit with respect to the variation in the diameter of the tube 50, the tube closing amount can be adjusted, and there is an effect that it is easy to guarantee the discharge accuracy. .

  Moreover, since the tube unit 2 is comprised by the fingers 40-46 and the tube 50 with respect to the control unit 3 containing the cam 20, the rotor 70, the vibrating body 80, the control circuit part 60, and the battery 61, cost is also cheap. Therefore, if the control unit 3 is repeatedly used and is used disposable for each liquid (medical solution) using the tube unit 2 and for each use target (for example, for each individual), the running cost can be reduced.

  The micro pump 1 of the present embodiment has a structure in which the rotor 70 is rotated by using a flat plate-like vibrating body 80 and the cam 20 rotates, and the rotor 70 is driven by frictional force (pressing force). Unlike the case of driving with a magnetic force as in the step motor, the driving force is high. Accordingly, a reduction gear mechanism is not required as in the prior art, and a connection mechanism between the motor module and the pump module is not required, the structure is simplified, and a small and thin micro pump can be realized.

  Further, the structure can be greatly simplified as compared with the above-described prior art, and the manufacturing cost can be reduced.

  Further, by directly converting the in-plane vibration of the vibrating body 80 into rotation of the rotor 70 and applying a rotational force in a direction perpendicular to the rotation axis of the rotor 70, energy loss is small, and the rotor 70 is made highly efficient. It can be rotated.

  Further, since the rotation axes of the rotor 70 and the cam 20 are coincident with each other, the connection mechanism as in the prior art described above becomes unnecessary, and a further miniaturized micro pump can be realized.

  Further, the rotor 70 is provided with a groove 71 along the rotation direction, and the protrusion 81 a of the vibrating body 80 is disposed so as to contact the inner side surface (contact surface 72) of the groove 71, thereby forming a thin plate shape. It is possible to prevent the vibrating body 80 from being detached from the contact surface 72 due to external vibration, impact, or the like.

  Further, the control circuit unit 60, the battery 61, and the vibrating body 80 are dispersedly arranged at positions that do not overlap the tube 50, the cam 20, and the fingers 40 to 46, thereby making the micropump thinner. As a result, the assembly is further improved.

  The control unit 3 is formed by arranging the cam 20, the rotor 70 (including the cam 20), the vibrating body 80, the control circuit unit 60, and the battery 61 on the front and back surfaces of the second machine casing 15. Layout design becomes easy. Further, it is possible to realize a structure that can be easily miniaturized in a plan view.

  Further, in the present embodiment, a vibrating body 80 including piezoelectric elements 82 and 83 is used as a drive source. Since the piezoelectric elements 82 and 83 are hardly deteriorated by driving, they have excellent durability and can be used for a long time. However, at that time, when a small button type battery is used, it is expected that the battery capacity is insufficient during the period of use. Therefore, if the battery 61 can be easily replaced by itself, the micropump 1 can be continuously used for a long time.

Further, it is possible to eliminate the troublesomeness of disassembling the micropump 1 and replacing the battery 61, and to eliminate the problem of damaging other members around the battery at the time of replacement.
(Embodiment 2)

  Next, the micro pump according to the second embodiment will be described with reference to the drawings. The second embodiment is characterized in that the rotor 70 has a ring shape, and the protruding portion 81a of the vibrating body 80 is disposed so as to contact the ring-shaped inner peripheral side surface of the rotor 70. Therefore, the description will focus on the differences from the first embodiment.

  FIG. 7 is a partial cross-sectional view showing the drive unit according to the second embodiment, and FIG. 8 is a plan view showing the rotor. 7 and 8, the rotor 170 has a ring shape by forming a recess from the lower surface in the drawing. And the vibrating body 80 is arrange | positioned in this recessed part.

  A groove 171 is formed in the ring-shaped inner peripheral side surface of the rotor 170 along the rotation direction of the rotor 170. An inner peripheral side surface of the groove 171 is an abutting surface 172 with which a protrusion 81 a provided on the vibrating body 80 abuts.

  Similarly to the first embodiment, the rotor 170 is configured to rotate together with the cam 20 so as to overlap the cam shaft 75 and rotate integrally therewith.

  In addition, the vibrating body 80 is fixed to the vibrating body fixing shaft 90 planted in the second machine casing 15 by a fixing screw 98 at the tip of the arm portion 81c (see FIG. 4).

  The configuration and driving action of the vibrating body 80 are the same as those in the first embodiment (see FIGS. 4 to 6), but the protrusion 81a contacts the contact surface 172 on the ring-shaped inner peripheral surface of the rotor 170, The rotor 170 is rotated clockwise (in the direction of arrow R in the figure).

According to such a configuration, the rotor 170 has a ring shape, and the protrusion 81 a of the vibrating body 80 is disposed so as to contact the contact surface 172 on the inner peripheral side surface of the rotor 170. Therefore, since the vibrating body 80 is disposed on the inner side of the outer diameter of the rotor 170, the size can be further reduced, and the layout design of the control circuit unit 60 and the battery 61 (see FIG. 3) can be facilitated. There is.
(Embodiment 3)

  Next, a micro pump according to Embodiment 3 will be described with reference to the drawings. The third embodiment further simplifies the structure of the second embodiment described above. The rotor is formed inside a recess formed in one plane of the cam 20, and a protrusion 81 a provided on the vibrating body 80. Is characterized in that it is disposed so as to contact the inner peripheral side surface of the recess. Therefore, the description will focus on the differences from the second embodiment.

  FIG. 9 is a partial cross-sectional view illustrating a drive unit according to the third embodiment. In FIG. 9, a recess is formed in the lower surface of the cam 20 (the surface in the direction of the second machine casing 15), and a vibrating body 80 is disposed in the recess.

  A groove 171 is formed on the inner peripheral side surface, and an abutting surface 172 is formed on the inner side surface of the groove 171 so that the protrusion 81 a provided on the vibrating body 80 contacts. That is, the rotor function is formed integrally with the cam 20.

  Further, the vibrating body 80 is fixed to the vibrating body fixing shaft 90 planted in the second machine casing 15 by a fixing screw 98 at the distal end portion (see FIG. 4) of the arm portion 81c (see also FIG. 8). ).

  The configuration and driving action of the vibrating body 80 are the same as those in the first embodiment (see FIGS. 4 to 6), but the protrusion 81a is a ring of the rotor 170 as in the second embodiment (see FIG. 8). Abutting on the abutting surface 172 on the inner peripheral side surface of the shape, the rotor 170 is rotated in the clockwise direction.

Therefore, according to the above-described configuration, since the rotor is integrally formed with the cam 20 in the cam 20, the structure can be further simplified and the size can be reduced.
(Embodiment 4)

  Next, a micro pump according to Embodiment 4 will be described with reference to the drawings. In the fourth embodiment, the cam 20, the rotor 70, the vibrating body 80, the control circuit unit 60, and the battery 61 are disposed in the space 30 configured by the guide frame and the machine frame, compared to the configuration of the first embodiment. It is characterized by being configured.

The individual components are the same as those in the first embodiment, and the configuration of the tube unit 2 is also the same, and the description thereof is omitted. Therefore, the same reference numerals are used for the description, focusing on the differences from the first embodiment.
FIG. 10 is a cross-sectional view illustrating a drive unit according to the fourth embodiment. 10 corresponds to the A-P-B cut plane shown in FIG.

  The cam 20 and the rotor 70 are pivotally supported between a bearing 93 provided on the second machine casing 15 and a bearing 92 provided on the fourth machine casing 18 in a state of being fixed to the camshaft 75. ing. Here, since the shaft hole of the bearing 93 is not penetrated, the airtightness of the space 30 is ensured.

  In the vibrating body 80, an arm portion 81 c is fixed to a vibrating body fixing shaft 90 planted in the second machine casing 15 by a fixing screw 98, and a protruding portion 81 a is formed in a groove 71 formed on the outer peripheral side surface of the rotor 70. It is in contact with the contact surface 72.

  A circuit board 63 is provided on the surface of the second machine casing 15, and a control circuit unit 60 is connected and fixed to the upper surface thereof. A battery 61 is disposed on the upper surface of the circuit board 63. The battery 61 is held by the battery lid 19.

  The negative electrode of the battery 61 is pressed toward the circuit board 63 by the battery lid 19 and connected to a connection pattern (not shown). On the other hand, the side surface of the battery 61 is a positive electrode and is connected to a connection pattern (not shown) by the battery terminal 62.

  The battery lid 19 is formed with a screw portion 19b, and the battery lid 19 and the fourth machine casing 18 are screwed and fixed. Therefore, in the state of the control unit 3, the battery lid 19 can be rotated and removed by a coin or a driver using the opening / closing groove 19 a formed in the battery lid 19, and the battery can be taken out or attached.

  Next, the planar configuration of each component in the configuration of the present embodiment will be described with reference to FIG. The vibrating body 80, the control circuit unit 60, and the battery 61 are distributed and disposed so as not to overlap each other at positions avoiding the tube 50 and the fingers 40 to 46.

  Here, the fourth machine frame 18 extends so as to cover the control circuit unit 60 and the battery 61 (not shown), and is fixed to the second machine by the fixing screw 107 at a position avoiding the control circuit unit 60 and the battery 61. It is fixed to the frame 15.

  In this way, the control unit 3 is configured, the tube unit 2 is mounted on the control unit 3 from above, and is fixed by the fixing screw 91 as shown in FIG.

  According to such a configuration, the cam 20, the vibrating body 80, the control circuit unit 60, and the battery 61 are divided into a guide frame (configured by the tube guide frame 17 and the third machine frame 16) and a machine frame (second machine frame). 15). Therefore, the first machine casing 14 used in the first embodiment (see FIG. 3) is not necessary.

Further, the vibrating body 80, the control circuit unit 60, and the battery 61 are respectively distributed and arranged at positions where the tube 50 and the fingers 40 to 46 do not overlap with each other in plan view.
For these reasons, the thickness can be further reduced.

  Further, by disposing the cam 20, the vibrating body 80, the control circuit unit 60, and the battery 61 on the one surface side of the second machine casing 15, assembly from one direction is possible, and assemblability is improved.

  Furthermore, in such a configuration, the battery 61 can be replaced in the state of the control unit 3 alone. That is, the battery 61 can be replaced independently in the state of the control unit 3 in accordance with the replacement time of the tube unit 2, eliminating the troublesomeness of taking out the battery 61 and damaging other peripheral members at the time of replacement. Can be eliminated.

In the present embodiment, the structure in which the protrusion 81a of the vibrating body 80 is in contact with the contact surface 72 on the outer peripheral side surface of the rotor 70 has been described as an example. However, in the second embodiment described above (see FIGS. 7 and 8). It is also possible to adapt to a configuration in which the protrusion 81a is in contact with the contact surface 172 on the inner peripheral side surface of the rotor 170 shown in the third embodiment (see FIG. 9).
(Embodiment 5)

  Next, Embodiment 5 will be described with reference to the drawings. The fifth embodiment is characterized in that in the tube unit, a speed reduction mechanism or a speed increasing mechanism is provided between the rotor and the cam. Here, an example of the speed reduction mechanism will be described.

  FIG. 11 is a cross-sectional view illustrating a drive unit according to the fifth embodiment. In FIG. 11, the speed reduction mechanism of the present embodiment includes a cam gear 101 provided on the cam 20, a rotor gear 105 provided on the rotor 70, and an intermediate wheel 102 that meshes with the cam gear 101 and the rotor gear 105. Has been.

  The cam gear 101 is fixed to the cam shaft 75 together with the cam 20, and is supported by bearings 92 and 93. The intermediate wheel 102 has an intermediate gear 103 and is supported by a bearing 95 provided in the second machine casing 15 and a bearing 94 provided in the intermediate wheel receiver 110. The intermediate wheel receiver 110 is fixed to the second machine casing 15 with a fixing screw or the like.

  On the other hand, the rotor gear 105 is formed on a rotor shaft 104 that fixes the rotor 70, and is supported by a bearing 97 provided on the second machine casing 15 and a bearing 96 provided on the fourth machine casing 18.

  Further, the vibrating body 80 is fixed to the vibrating body fixing shaft 90 planted in the second machine casing 15 by a fixing screw 98 at the distal end portion (see FIG. 4) of the arm portion 81c.

  A groove 71 is formed in the outer peripheral portion of the rotor 70 along the rotation direction, and an inner side surface of the groove 71 is a contact surface 72 with the vibrating body 80.

  The vibrating body 80 is disposed substantially at the center in the cross-sectional direction of the groove 71 of the rotor 70, and is fixed to the vibrating body fixing shaft 90 by a fixing screw 98.

  The configuration and operation of the vibrating body 80 are the same as those in the first embodiment (see FIGS. 4 to 6), and the relationship between the vibrating body 80 and the rotor 70 is the same as that in the first embodiment, and thus the description thereof is omitted.

  The rotor 70 is rotated by the vibration of the vibrating body 80, and the rotation of the rotor 70 is transmitted to the cam 20 via the rotor gear 105, the intermediate gear 103, and the cam gear 101. By providing the intermediate wheel 102, the cam 20 rotates in the same direction as in the first embodiment (see FIG. 2).

  Here, the gear ratio between the rotor gear 105 and the cam gear 101 is a reduction ratio, and the reduction ratio can be appropriately changed according to the gear ratio between the rotor gear 105 and the cam gear 101. Further, if the intermediate wheel 102 is configured with a large gear and a small gear, the reduction ratio can be further adjusted. In addition, what is necessary is just to use the gear ratio of each gear as a speed-up gear mechanism when speeding up.

  As described above, by providing the speed reduction mechanism or the speed increasing mechanism between the cam 20 and the rotor 70, the rotational speed of the cam 20 can be changed. That is, the amount of liquid flow can be adjusted as appropriate.

  In the present embodiment, the structure in which the protrusion 81a of the vibrating body 80 is in contact with the contact surface 72 on the outer peripheral side surface of the rotor 70 has been described as an example. However, in the second embodiment described above (see FIGS. 7 and 8). It is also possible to adapt to a configuration in which the protrusion 81a is in contact with the contact surface 172 on the inner peripheral side surface of the rotor 170 shown in FIG.

  Since the micropump 1 according to Embodiments 1 to 5 described above can be reduced in size and thickness, and can stably flow continuously at a minute flow rate, the micropump 1 is attached to a living body or a living body surface, It is suitable for medical use such as development of new drugs and drug delivery. Moreover, in various mechanical devices, it can be mounted in the device or outside the device and used for transporting fluids such as water, saline, chemicals, oils, fragrances, inks and gases. Furthermore, the micropump alone can be used for fluid flow and supply.

The micropump which concerns on Embodiment 1 is shown, (a) is a top view, (b) is a front view. FIG. 3 is a plan view illustrating a configuration of a drive unit according to the first embodiment. Sectional drawing which shows the AP cross section of FIG. FIG. 3 is a perspective view illustrating a configuration of a vibrating body according to the first embodiment. FIG. 3 is a partial plan view schematically showing the action of the vibrating body according to the first embodiment. Explanatory drawing which shows the motion of a projection part typically. FIG. 6 is a partial cross-sectional view illustrating a drive unit according to a second embodiment. FIG. 6 is a plan view showing a rotor according to a second embodiment. FIG. 9 is a partial cross-sectional view illustrating a drive unit according to a third embodiment. Sectional drawing which shows the drive part which concerns on Embodiment 4. FIG. FIG. 6 is a cross-sectional view illustrating a drive unit according to a fifth embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Micro pump, 2 ... Tube unit, 3 ... Control unit, 14 ... 1st machine frame, 15 ... 2nd machine frame, 16 ... 3rd machine frame, 17 ... Tube guide frame, 20 ... Cam, 40-46 ... Fingers, 50... Tube, 60... Control circuit section, 61. Battery, 70... Rotor, 80 .. Vibrating body, 81 a.

Claims (16)

A tube partially disposed in an arc shape and having elasticity, a plurality of fingers radially disposed from the central direction of the arc shape of the tube, a guide frame that holds the tube and the plurality of fingers, A tube unit having
A vibrating body having a cam whose rotational axis substantially coincides with the center of the arc shape of the tube, a rotor for transmitting a rotational force to the cam, a piezoelectric element, and a protrusion that contacts the rotor at a longitudinal end. A control circuit unit that is supplied with electric power from a power supply unit and applies an AC voltage to the piezoelectric element, and a machine frame that holds the cam, the rotor, the vibrator, and the control circuit unit. ,
Is provided,
The tube unit and the control unit are mounted in an overlapping manner and are detachable,
When the alternating current voltage is applied to the piezoelectric element, the vibrating body vibrates, a rotational force is repeatedly applied from the protrusion to the rotor, and the cam sequentially presses the plurality of fingers from the fluid inflow side to the outflow side. A micropump that transports fluid by repeatedly closing and releasing the tube. The micropump according to claim 1,
The cam, the rotor, and the vibrating body are disposed in a space constituted by the guide frame and the machine frame,
At least one of the control circuit section and the power supply section is disposed on the opposite side of the machine frame with respect to the space. The micropump according to claim 1,
The micropump characterized in that the cam, the rotor, the vibrating body, the control circuit unit, and the power supply unit are arranged in a space constituted by the guide frame and the machine frame. The micropump according to claim 1,
The rotor has a disk shape,
The micropump characterized in that the protrusion is disposed so as to contact the outer peripheral side surface of the rotor. The micropump according to claim 1,
The rotor has a ring shape;
The micropump characterized in that the protrusion is disposed so as to contact the ring-shaped inner peripheral side surface of the rotor. The micropump according to claim 1,
The rotor is formed in a recess formed in one plane of the cam;
The micropump characterized in that the protrusion is disposed so as to contact an inner peripheral side surface of the recess. In the micropump according to any one of claims 1 to 6,
The micropump characterized in that the rotation axis of the rotor coincides with the rotation axis of the cam. In the micropump according to any one of claims 1 to 7,
A groove along the rotation direction is provided on the contact surface of the rotor with the protrusion,
The micropump characterized in that the protrusion is disposed so as to contact the inner side surface of the groove. In the micropump according to any one of claims 1 to 8,
Each of the vibrating body, the control circuit unit, and the power supply unit is dispersedly arranged at a position that does not overlap the tube, the cam, and the plurality of fingers in a planar manner. The micropump according to claim 2, wherein
The micropump characterized by the above-mentioned. The said power supply part is detachable independently in the state with which the said tube unit and the said control unit were mounted | worn. The micropump according to claim 3, wherein
The micropump characterized by the above-mentioned power supply part being detachable independently in the state of the control unit. The micropump according to claim 1,
A micropump, wherein a speed reduction mechanism or a speed increase mechanism is provided between the rotor and the cam. A part of the tube is arranged in an arc shape and has an elastic tube whose cam axis substantially coincides with the center of the arc shape, a rotor that transmits rotational force to the cam, a piezoelectric element, and a longitudinal end. A vibrating body having a protrusion abutting against the rotor; a control circuit section for applying an alternating voltage to the piezoelectric element; a power supply section; the cam; the rotor; the vibrating body; the control circuit section; A control unit comprising a machine frame that holds
A tube unit comprising: the tube; a plurality of fingers arranged radially from a central direction of the arc shape of the tube; and a guide frame that holds the tube and the plurality of fingers. A tube having a part thereof arranged in an arc shape and having elasticity, a plurality of fingers arranged radially from the central direction of the arc shape of the tube, a guide frame holding the tube and the plurality of fingers, It is detachable from the tube unit having
A vibrating body having a cam whose rotational axis substantially coincides with the center of the arc shape of the tube, a rotor for transmitting a rotational force to the cam, a piezoelectric element, and a protrusion that abuts the rotor at the longitudinal end. And a control circuit unit for applying an AC voltage to the piezoelectric element, a power source unit, a machine frame for holding the cam, the rotor, the vibrating body, the control circuit unit, and the power source unit. Feature control unit. The control unit according to claim 14,
The control unit, wherein the cam, the rotor, the vibrating body, the control circuit unit, and the power supply unit are arranged on the tube unit side of the machine casing. The control unit according to claim 14,
The cam, the rotor, and the vibrating body are disposed on the tube unit side of the machine frame,
At least one of the control circuit section and the power supply section is disposed on the opposite side of the machine frame with respect to the tube unit.

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