JP2001115972A - Roller-type pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem such that a roller-type pump is hardly downsized because a motor must have large power resulting in that a large motor is required to decrease decelerating ring trains of the roller-type pump. SOLUTION: This roller-type pump comprises an oscillation body for generating cyclic oscillation due to expansion motion of a piezoelectric element, a rotatable moving body, and oscillating driving circuit that is connected to at least the piezoelectric element and cyclically applies the expansion motion to the piezoelectric element. An ultrasonic motor with a structure in which the moving body and the oscillation body are piled is used, a roller for wringing a liquid feed tube is provided for the moving body, and at least a part of the roller are disposed between the oscillation body and the moving body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a pump for supplying a liquid by squeezing a tube with a roller.

[0002]

2. Description of the Related Art Regarding a conventional roller type pump 900,
This will be described with reference to FIGS. FIG. 14 is a front view showing the internal structure of a conventional roller pump 900, FIG. 15 is a rear view thereof, and FIG. 6 is a sectional view thereof. Roller pump 90
A step motor 902 is provided on the front side of the
And the respective components of the liquid supply means are incorporated on the back side. As shown in FIG. 14, the step motor 902 is an integral type stator, and a coil 904 is magnetically coupled to the stator 903 via a set screw 904a. A notch 906 is provided in the inner hole 903a of the stator 903 to determine the circuit direction of the rotor 905 that is magnetized to two poles in the radial direction.

The rotor 905 is connected at a predetermined gear ratio to a rotating shaft 908 that penetrates the center of the roller pump 900 via a reduction gear train 907 composed of a plurality of gears.
Both ends of the coil 904 are connected to a control circuit via conductive leads 914, and required electric power is supplied from a battery. As shown in FIG. 15, a guide surface 901 a and tube guide grooves 901 b and 901 c are formed in a substantially horseshoe shape around the rotation shaft 908 on the back surface side of the support 901. A part of the liquid feed tube 909 is arranged in an arc shape along the guide surface 901a.

A central portion of an operating lever 910 is fixed to the rotating shaft 908 with a set screw 911.
Rotors 913a and 913b having rotatable bearings 912 are provided at both ends of 0, respectively. These rotors 913a and 913b are arranged so as to come into contact with the inner peripheral surface of the arc-shaped liquid sending tube 909 at a predetermined pressure. Therefore, when the rotor 905 rotates by the driving of the step motor 902, the rotation shaft 908 and the operation lever 910 rotate via the reduction gear train 907, and the rotor 91 rotates.
3a and 913b have a structure in which the liquid inside the liquid sending tube 909 is gradually extruded in the rotation direction to supply the liquid.

[0005] For example, such a roller type pump is disclosed in Japanese Patent Application Laid-Open No. H11-042286.

[0006]

However, since the output torque of the step motor 902 is small, a speed reduction gear train 907 is required between the step motor 902 and the operating lever 910. Since a large output is required, a large motor is required.
Therefore, there is a problem that it is difficult to reduce the size of the roller pump. In particular, in an implantable or portable chemical liquid supply pump used as a medical device, miniaturization is an important issue, and can be solved by the present invention.

Therefore, an object of the present invention is to use an ultrasonic motor capable of obtaining a high torque in place of the motor, the reduction gear train and the operating lever, and to install rollers on the moving body of the ultrasonic motor with good space efficiency. Another object of the present invention is to provide a compact, high-performance roller pump.

[0008]

That is, the present invention has a guide surface facing a roller portion, and a liquid feed tube arranged along the guide surface, wherein the liquid feed tube filled with liquid is provided. A roller pump having a structure in which the liquid filled in the liquid feeding tube is pushed out by moving the roller along the guide surface by squeezing the liquid between the roller and the guide surface. For expanding the displacement of the periodic vibration generated in the vibrating body due to the expansion and contraction movement of the piezoelectric element. The power transmitting projection provided on the vibrating body is pressed against the power transmitting projection. An ultrasonic motor having a structure comprising a moving body moved via frictional force and a support shaft for fixedly supporting the vibrating body, wherein the moving body and the vibrating body are stacked in the direction of the rotation axis of the moving body. The used for driving of the roller pump, characterized in that it has an installation structure so as to be sandwiched at least a portion of the installed the roller to the moving body between the moving body and the vibrating body.

According to the present invention, in the ultrasonic motor, a roller is provided on the moving body, and the liquid-feeding tube filled with liquid is squeezed by the roller and the guide surface facing the roller. Because of the structure in which the liquid filled in the liquid tube is squeezed and pushed out, a moving body provided with rollers plays a role similar to that of the operation lever 910. That is, the actuation lever 910 is pressed against a power transmission projection mounted on the vibrating body to increase the vibration displacement of the vibrating body and is directly driven to rotate via frictional force. The effect that the type pump is miniaturized is obtained.

In addition, the size of the roller pump can be reduced by disposing at least a part of the roller in the space between the vibrating body and the moving body which is provided for the power transmission projection. Is obtained.
Next, the present invention is characterized in that, in the roller pump, the moving body has a reduced thickness of the roller mounting portion.

According to the present invention, the roller requiring a predetermined thickness can be arranged between the vibrating body and the moving body while securing the rigidity of a portion of the moving body that comes into contact with the power transmission projection. Therefore, the effect that the size of the roller pump can be further reduced in the rotation axis direction of the moving body can be obtained. Further, the present invention is characterized in that, in the roller pump, at least one of the vibrator and the support shaft plays a role of the guide surface.

According to the present invention, since a part of the member constituting the ultrasonic motor plays the role of the guide surface,
There is no need to provide a guide member on the outer peripheral side of the vibrating body, and the roller pump can be further downsized in the radial direction. Further, in the roller pump according to the present invention, in the roller pump, the roller portion is a roller pressed against the liquid feed tube, a roller bearing for enabling the roller to rotate, and And a roller shaft for guiding the rotation of the roller.

According to the present invention, when the roller moves along the guide surface, the load torque of the moving body is reduced, so that the power consumption of the ultrasonic motor can be reduced. The effect that the power consumption of the type pump can be reduced is obtained. Further, according to the present invention, in the roller pump described above, the piezoelectric element is a disc-shaped, and at least one surface is formed with multiple electrodes of 4 at substantially equal intervals, and two adjacent electrodes are formed. A pair of electrodes is subjected to a polarization process such that the direction is alternately reversed for each set, and the electrodes are electrically short-circuited every other one to form two sets of electrode patterns. The power transmission projections are provided at every other position on one surface of the vibrating body near a boundary of the electrodes formed on the plane of at least one of the piezoelectric elements by a multiple of 4 at substantially equal intervals. In addition, it is arranged for transmitting power to the moving body.

According to the present invention, the position of the standing wave vibration generated in the vibrating body changes depending on which of the two sets of electrode patterns is used for driving, that is, the position of the power transmission protrusion and the position of the standing wave vibration. By changing the relationship, the rotation method of the moving body can be switched. Thus, the moving body of the roller pump can be rotated forward / reversely / stopped, so that a roller pump having high controllability of the liquid feed amount can be obtained.

Further, the present invention provides the roller pump, further comprising an oscillation driving circuit for driving the ultrasonic motor by self-oscillating the vibrating body having the piezoelectric element, wherein the oscillation driving circuit is An output terminal is connected to each of the two sets of electrode patterns formed on the piezoelectric element, and two power amplifiers for independently exciting and driving each of the electrode patterns; and the two sets of electrode patterns of the piezoelectric element are provided. A pre-power amplifier having an input terminal connected to an electrode formed on a surface opposite to the formed surface, and an output terminal connected to input terminals of two sets of the power amplifiers. The ultrasonic motor is driven by setting one of the two power amplifiers and the pre-power amplifier to the active state, and the ultrasonic sound is determined by selecting one of the two power amplifiers to the active state. Switching the rotation direction of the motor, according to the invention, characterized in that, can drive the ultrasonic motor does not require an external oscillator, the drive circuit can be downsized. Therefore, the effect that the roller pump can be further reduced in size can be obtained.

Further, the oscillation driving circuit based on the self-excited oscillation may change the optimum driving frequency of the ultrasonic motor depending on the temperature characteristic or the optimum driving frequency depending on the pressing force between the moving body and the vibrating body. Therefore, an effect is obtained in that the optimum driving frequency is always followed, so that stable rotation of the moving body can be always realized. Furthermore, the present invention is characterized in that the present invention is an electronic device provided with the above-mentioned roller pump.

According to the present invention, the size of the roller pump can be reduced, so that the electronic equipment having the roller pump can be downsized.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (1) First Embodiment A roller pump 1 according to a first embodiment of the present invention is roughly divided into an ultrasonic motor 100 and a throttle mechanism 700.
And The detailed configuration and operation will be described below.

First, the ultrasonic motor 100 will be described in detail. FIG. 1 is a diagram illustrating a structure of an ultrasonic motor used for the roller pump 1 according to the first embodiment. In FIG. 1, the ultrasonic motor 100 includes a piezoelectric element 102, a vibrating body 101 joined to the piezoelectric element 102, a moving body 108 abutting on a power transmission projection 107 provided on the vibrating body 101,
Pressurizing means 109 for pressurizing moving body 108 and vibrating body 101
A holding portion 105 which is a portion around a hole provided in the center of the vibrating body 101, a support shaft 202 fixed to the holding portion 105, and a fixed base 201 to which a base end of the support shaft 202 is fixed.
It has. The first connection means 104a and the second connection means 104b are arranged on the fixed base 201.

FIG. 2 is a diagram showing a planar structure and a sectional structure of the vibrating body 101 applied to the ultrasonic motor.
FIG. 3 is a diagram showing a planar structure of the piezoelectric element 102. FIG.
As shown in (a), in order to generate a standing wave of three wavelengths in the circumferential direction on the disk-shaped vibrating body 101, one plane of the piezoelectric element 102 is substantially equally divided into 12 quarters. Fan-shaped electrodes corresponding to the wavelengths (a1, b1,..., A
6, b6) are formed.

The polarization process is performed in the thickness direction such that the direction is alternately reversed for each pair of two adjacent electrodes. Here, (+) or (−) in the figure indicates the direction of the polarization treatment, and (+) indicates that a positive electric field is applied to the joint surface with the vibrating body 101, and (−)
Applies a negative electric field to the joint surface with the vibrating body 101. Then, as shown in FIG. 2, the fan-shaped electrodes (a1, b
1,..., A6, b6) are connection means 1 every other one
04a and 104b are short-circuited to form two sets of electrode patterns. The power transmission projections 107 are provided on the vibrating body 101 so as to be located on every other boundary of the sector-shaped electrodes (a1, b1,..., A6, b6). Specifically, the electrode structure of the piezoelectric element 102 is shown in FIG.
As shown in (a), after performing the polarization process, two sets of short-circuited electrode patterns 103a and 103b are formed using a short-circuit electrode. These electrodes are formed by thin film forming means such as vapor deposition, sputtering, and printing. Then, as shown in FIG. 2 (b), the two electrode patterns 103a and 103b are connected to connection means 104a and 104a, respectively.
04b.

As shown in FIG. 2, the vibrating body 101 has a disk shape made of metal, and vibrates every other boundary of the divided portion of the piezoelectric element 102 (an intermediate position between the node and the antinode of the standing wave). A rectangular power transmission projection 107 for converting vibration energy of the body 101 into driving force of the moving body 108 is provided. FIG. 4 is a diagram illustrating the operation principle of the ultrasonic motor 100.

In FIG. 4A, when an excitation signal is input to one of the electrode patterns (103a or 103b) of the piezoelectric element 102, the divided portion is excited at a predetermined frequency, and the bending constant for three wavelengths is applied to the vibrating body 101. A standing wave occurs. At this time, as shown in FIG. 4B, since the power transmission projection 107 provided on the vibrating body 101 is located at an intermediate position between the antinode and the node of the bending standing wave, the power transmission projection 107 moves up and down while drawing an arc. Since the power transmission projection 107 contacts the moving body 108 only when moving from left to right in the drawing, the moving body 108 is moved in the direction of the arrow in the drawing.

On the other hand, in FIG. 4A, when an excitation signal is input to the other electrode pattern, a bending standing wave having a phase different from that of the above-described bending standing wave by a quarter wavelength to the vibrating body 101. Occurs. At this time, as shown in FIG. 4C, the power transmission projection 107 comes into contact with the moving body 108 only when moving from the right to the left in the figure, and thus is moved in a direction opposite to the above.

FIG. 5 shows a roller pump 1 according to the first embodiment.
1 shows a specific configuration of an oscillation drive circuit for driving the ultrasonic motor 100 used in FIG. Vibrating body 101
A piezoelectric element 10 in which two sets of electrode patterns 103a and 103b each including a plurality of electrodes are formed on one plane.
2 are joined by means such as adhesion. Oscillation drive circuit 40
Reference numeral 5 denotes a vibrating body 101 to which a piezoelectric element 102 is joined. The inverter 502 includes the piezoelectric element 1
02 on one surface on which two sets of electrode patterns 103a and 103b are formed, and the electrode 103 formed on the other surface.
It plays the role of an inverting power amplifier for inverting and amplifying an electrical signal as excitation information from c or the vibrator 101.

The resistor 503 is connected in parallel to the inverter 502 and stabilizes the operating point of the inverter 502. An output terminal of the inverter 502 is connected to input terminals of two sets of buffers 501a and 501b via a resistor 504.
Output terminals of the two buffers 501a and 501b are respectively connected to two sets of electrode patterns 103a and 103b formed on one plane of the piezoelectric element 102.

Also, two capacitors 505 and 50
The reference numeral 6 designates one end connected to the input terminal of the inverter 502 and the output terminal via the resistor 504, and the other end grounded to adjust the phase in the oscillation drive circuit 405.
Two electrode patterns 103 formed on the piezoelectric element 102
a and 103b immediately before the two buffers 501a and
The arrangement of the capacitors 01b is not only because the capacitors 505 and 506 are connected to the input terminal and the output terminal of the inverter 502 for the purpose of phase adjustment and DC cutoff, but also the piezoelectric element 102 is basically a capacitive load. This is very effective for obtaining high output from the ultrasonic motor.

Here, each of the inverter 502 and the two buffers 501a and 501b has a control terminal in addition to an input terminal and an output terminal, and the output terminal can be in a high impedance state depending on a signal input to the control terminal. An inverter and a buffer having a state configuration. The forward / reverse rotation signal generator 110 outputs a forward / reverse rotation signal to the switching circuit 106 for setting the rotation direction of the ultrasonic motor. The output terminal of the switching circuit 106 is connected to the oscillation driving circuit 405
Two tri-state buffers 501a and 501
b and the control terminal of the tri-state inverter 502, respectively.
Based on the output signal of 0, one of the two tri-state buffers 501a and 501b is made to function as a normal buffer, and the output terminal of the other buffer is set to a high impedance state and disabled.

The vibrating body 101 is driven by a tri-state buffer which functions as a normal buffer selected by an output signal of the switching circuit 106. Vibrating body 101
Is driven only by the tri-state buffer permitted to function as a normal buffer by the switching circuit, and when the tri-state buffer permitted to function as a normal buffer is replaced by the switching circuit 106, The direction of rotation of the ultrasonic motor is reversed.

As shown in FIG. 6, in an ultrasonic motor of a type in which the direction of rotation is switched by selectively using two sets of electrode patterns 103a and 103b formed on the piezoelectric element 102, as shown in FIG. It is conceivable to use a switch 224 such as an analog switch to switch which of 103a and 103b is incorporated and used. However, since the switch has a resistance component, the switch 224 has a small resistance. In this case, the oscillation drive frequency and the voltage level change due to the phase shift, thereby increasing the motor output loss.

As described above, two tri-state buffers 501a and 501b are connected to two sets of electrode patterns 103.
The configuration in which the electrodes a and 103b are independently arranged has an effect of eliminating various problems caused by the resistance component of the switch, as compared with the system in which the electrode pattern is switched by an analog switch as shown in FIG. It contributes to the improvement of motor output.

The output signal from switching circuit 106, which is output based on the output from forward / reverse signal generating means 110, allows tri-state inverter 502 to have its output terminal in a high impedance state. When the 502 is disabled, both of the two tri-state buffers 501a and 501b are disabled, so that the ultrasonic motor can be stopped.

As described above, the ultrasonic motor 100 used in the first embodiment can easily and reliably switch between normal rotation and reverse rotation. Next, FIG. 7, FIG. 8, and FIG.
The roller pump 1 will be described in detail with reference to FIG. FIG. 7 shows a sectional view of the roller pump 1. The roller pump 1 is
A roller shaft 712a installed on the moving body 108a and serving as a rotation axis of the roller 711, a roller bearing 712b for enabling the roller 711 to rotate, and a roller 711 rotatable by the roller bearing 712b around the roller shaft 712a as a rotation center. And a liquid supply tube 713 in contact with the roller 711 and filled with liquid, a guide surface 714a opposed to the roller 711 via the liquid supply tube 713 and guiding the liquid supply tube 713, and a vibration including the guide surface 714a. A guide member 714 provided on a fixed base 201a for fixing the vibrating body 101 fastened to the holding portion 105 of the body 101
And is composed of

FIG. 8 is a plan view of the roller pump 1.
As shown in FIG. 8, rotatable rollers 711a, 711b, and 711c are provided on the moving body 108a, and are arranged so as to be in pressure contact with the liquid feeding tube 713. Then, the guide surface 714a and the rollers 711a, 711b, 7
The liquid supply tube 713 is squeezed at 11c to push out the filled liquid.

Here, the rollers 711a, 711b, 71
The three roller pumps 1c are sandwiched between the vibrating body 101 and the moving body 108a and are arranged at intervals of 120 °. The space 1 is used efficiently, so that the roller pump 1 is downsized.
Also, by disposing the rollers 711a, 711b, 711c so that at least one of the rollers 711a, 711b, 711c always squeezes the liquid supply tube 713, the ultrasonic motor has a high holding torque even when stopped. Therefore, the backflow of the liquid can be prevented.
Here, rollers 711a, 711 arranged at equal intervals
b, 711c may be one, two, or three or more.

Next, Embodiment 1 will be described with reference to FIGS.
The operation of the roller pump 1 will be described.
FIG. 9 shows a roller pump 1 according to the first embodiment.
FIG. 4 is a cross-sectional view showing a deformation of the roller 711. By inputting an electric signal from the oscillation driving circuit 405 to the ultrasonic motor 100 to rotate the moving body 108a, the rollers 711a, 711b, 7 provided on the moving body 108a are rotated.
11c moves along the liquid sending tube 713 while drawing a rotation locus about the rotation center of the moving body 108a.
At this time, the guide surface 714a and the roller 711
The liquid supply tube 713 is installed so as to pressurize and restrict the liquid supply tube 713. Therefore, the restriction of the liquid supply tube 713 moves on the liquid supply tube 713 from the liquid supply tube supply side 713a to the liquid supply tube discharge 713b side. The liquid filled in the tube 713 is extruded in one direction.

Here, the rollers 711a, 711b, 71
1c is provided with a roller bearing 712b, and a roller shaft 712a
By reducing the friction coefficient of the roller bearing 712b and the load torque applied to the ultrasonic motor 100, the power consumption of the ultrasonic motor 100 is suppressed, and the power saving of the roller pump 1 is realized. The roller 711 is installed on the moving body 108a as shown in FIG. 7, and the roller 711 is rotatably supported by a roller shaft 712a and a roller bearing 712b. As shown in FIG.
b, a roller bearing 712c is mounted so that the shaft of the shaft-attached roller 711d having a shape protruding at the center of the column is rotated by the roller bearing 712d.
The structure may be such that it is supported by c. Here, as shown in FIG. 9B, the roller with shaft 711e may be simply cylindrical, and is disposed on the moving body 108c by disposing the guide surface 714d on the bank 714c provided on the guide member 714b. A roller 711e with a shaft guided by a roller bearing 712c and a guide surface 714d.
Alternatively, a structure in which the liquid sending tube 713 is narrowed may be used.

The roller shaft 712a is connected to the moving body 108a.
Need not be perpendicular to the guide surface 714
What is necessary is just to be parallel to a. Also, the ultrasonic motor 10
By rotating 0 in the reverse direction, the throttle of the liquid sending tube 713 moves on the liquid sending tube 713 in a direction opposite to the moving direction, and the feeding and discharging can be reversed.

Further, by stopping the ultrasonic motor 100, it is possible to stop the restricting of the liquid sending tube 713 and stop the discharge of the liquid and prevent the backflow. Further, when the ultrasonic motor 100 is stopped, the ultrasonic motor maintains a high holding torque without consuming electric power. Therefore, there is no power consumption when the liquid supply is stopped, so that power saving of the roller pump 1 can be realized.

Although a standing wave type ultrasonic motor is used here, a similar effect can be obtained by using a traveling wave type ultrasonic motor. As described above, according to the first embodiment, the roller 711
a, 711b, and 711c are the vibration body 101 and the moving body 108.
By arranging the liquid feeding tube 713 arranged in a substantially horseshoe shape by arranging it in the space sandwiched by a, the roller pump can be downsized in the radial direction.

Further, rollers 711a, 711b, 71
By disposing 1c on the vibrating body 101 and the moving body 108a so as to overlap in the axial direction of the moving body, the roller pump can be downsized in the axial direction of the moving body. Further, by using an ultrasonic motor, the moving body 108a as the tube throttle mechanism 700 and the rollers 711a, 711b, and 711c installed on the moving body 108a can be directly driven without a reduction gear train, so that the roller pump can be downsized. it can.

The ultrasonic motor 100 is operated in a forward rotation, a reverse rotation,
By stopping, reverse rotation and reverse flow of the liquid can be prevented. Further, since the ultrasonic motor has a feature of maintaining a high holding torque without consuming power, there is no power consumption when the liquid supply is stopped, and power saving of the roller pump can be realized.

(2) Second Embodiment A roller pump 2 according to a second embodiment of the present invention is roughly divided into an ultrasonic motor 140 and a throttle mechanism 720.
a. The detailed configuration and operation will be described below. FIG. 10 is a diagram showing a cross-sectional structure of a roller pump according to a second embodiment of the present invention. The oscillation drive circuit constituting the roller pump 2a uses the one shown in FIG.
The ultrasonic motor 140 constituting the roller pump 2a is the same as the ultrasonic motor 1 shown in the first embodiment except for the moving body 721a.
Same as 00.

As shown in FIG. 10, a squeezing mechanism 720a constituting the roller pump 2a is mounted on a moving body 721a and has a roller shaft 712a serving as a rotation shaft of the roller 711.
And a roller bearing 7 for enabling the roller 711 to rotate.
12b, a roller 711 rotatable around a roller shaft 712a by a roller bearing 712b, and a liquid feeding tube 7 in contact with the roller 711 and filled with liquid.
13, a guide surface 714a which is opposed to the roller 711 via the liquid feeding tube 713 and guides the liquid feeding tube 713.
And the holding portion 10 of the vibrating body 101 including the guide surface 714a
5 and a fixing table 20 for fixing the vibrating body 101
1a.

In the second embodiment, in the structure of the disk-shaped movable body 721a on which the roller 711 is installed, a step is provided concentrically with the movable body 721a at a position contacting the power transmission protrusion 107, It includes a portion that comes into contact with the power transmission projection 107, and the rotation center side of the moving body 721a is thicker than that. Further, a roller 711 is provided on a portion where the thickness of the moving body 721a is thinner outside the portion where the moving body 721a is in contact with the power transmission projection 107 so that the roller shaft 712a is parallel to the thickness direction of the moving body 721a.

With the above structure, it is possible to prevent the rigidity of the moving body from being reduced by reducing the thickness of the moving body, thereby preventing the output efficiency of the ultrasonic motor from being reduced. When the roller 711 requiring a predetermined thickness is installed as described above, the roller 711 of the moving body 721a is used.
By arranging a thinner part, the rigidity of the moving body 721a is ensured, and the moving body 721a, the vibrating body 101, and the roller 711 sandwiched therebetween are secured while preventing the output efficiency of the ultrasonic motor 140 from being lowered. Since the superposed thickness can be reduced, the size of the roller pump 2a in the thickness direction can be reduced. Further, since the output efficiency of the ultrasonic motor is prevented from lowering, the power consumption of the roller pump 2a can be suppressed, and power saving can be realized.

As shown in FIG. 11, in order to reduce the thickness of the movable body at which the roller 711 is installed, the movable body 721a is deformed to move the throttle mechanism 720b constituting the roller pump 2b. The body 721b may have the following structure. The structure of the moving body 721b includes a disk-shaped roller supporting member 732 on which a roller 711 requiring a predetermined thickness is installed, and a member having a smaller diameter than the roller supporting member 732 and ensuring rigidity of the moving body 721b. And a spacer member 733 in contact with the power transmission projection 107.
And a structure formed by bonding the roller support member 732 and the spacer member 733 so as not to slip.

Also, as shown in FIG.
In order to reduce the thickness of the portion where the roller 711 of c is installed, a counterbore may be provided at the portion of the moving body 721c where the roller 711 is arranged, and the roller 711 may enter the counterbore portion. Here, the spot facing is the power transmission projection 1 of the moving body.
07 is located outside of the contact area, and the moving body 72
The contact state between 1c and the power transmission projection 107 is set so as not to be unstable.

(3) Third Embodiment A roller pump 3 according to a third embodiment of the present invention is roughly divided into an ultrasonic motor 150 and a throttle mechanism 750.
And The detailed configuration and operation will be described below. FIG. 13 shows a third embodiment of the roller pump according to the present invention.
FIG. 3 is a view showing a cross-sectional structure of the ultrasonic pump 100. The oscillation drive circuit forming the roller pump 3 uses the one described in the first embodiment. The moving body 108, the holding section 105, the vibrating body 101, and the power transmission projection 107 are deformed, and the moving body 10
8, holding portion 105, vibrating body 101, and power transmission protrusion 107
Other than the above, those described in Embodiment 1 are used.

First, the ultrasonic motor 150 constituting the roller pump 3 will be described. As shown in FIG. 13, an ultrasonic motor 150 is a modification of the ultrasonic motor 100 shown in the first embodiment as follows. Roller pump 3
In the ultrasonic motor 150 constituting the
As described in the first embodiment, the power transmission projection 107a is provided inside the outermost periphery of the vibration body 101, but in the vibration body 151, the power transmission projection 107a is
It is installed at the outermost circumference of.

The holding part 155 shown in FIG.
2a, and the support shaft 202a has a shape including a guide surface 714b. Moving object 75
1 has a small thickness of the moving body where the roller 711 is arranged as in the second embodiment, but the roller 711 is arranged inside the power transmission projection 107a of the vibrating body 151. The part where the thickness of the moving body is thinner is arranged inside the part that comes into contact with the power transmission protrusion 107a of the moving body 751.

Next, as shown in FIG.
Reference numeral 0 denotes a roller shaft 712a that is installed on the moving body 751 and serves as a rotation axis of the roller 711, a roller bearing 712b for enabling the roller 711 to rotate, and a roller bearing 712b that is rotatable around the roller shaft 712a. A certain roller 711, a liquid feeding tube 713c in contact with the roller 711 and filled with liquid, a guide surface 714b opposed to the roller 711 via the liquid feeding tube 713c and guiding the liquid feeding tube 713c, and a guide surface 714b. , And a support shaft 202a.

As described above, the roller 711 and the roller shaft 7
The embodiment is achieved by arranging the roller bearing 12a, the roller bearing 712b, the liquid feeding tube 713c, and the guide surface 714b inside the power transmission projection 107a of the vibrating body and between the moving body 751 and the vibrating body 151. Unlike the first and second embodiments, the guide member 714 is not required, and the radial size of the roller pump can be reduced. Further, since the power transmission projection 107a is arranged on the outermost periphery of the vibrating body 151, the arm length is longer in the output torque of the ultrasonic motor 150, so that the output torque can be improved, and the output torque is stable even at low power. To drive the roller pump.

[0054]

As described above, according to the present invention, an ultrasonic motor is used as a drive unit of a roller pump, and a roller, a liquid feeding tube, and a guide surface are spatially and efficiently arranged, so that a roller pump is realized. By using the oscillation driving circuit 405 of the first embodiment as an oscillation driving circuit,
The effect that the oscillation drive circuit can be downsized and the roller pump can be downsized, and by using an ultrasonic motor for the drive unit of the roller pump, forward rotation, reverse rotation and stop can be easily performed. The power consumption of the roller pump is reduced because the ultrasonic motor has a high holding torque without consuming power when stopped. When the roller type pump of the present invention is applied to a portable or implantable medical pump, the ultrasonic motor is not affected by an electromagnetic wave or a magnetic field. In addition, it is possible to obtain a medical pump having high reliability with respect to changes in the environment because of stable driving.

[0055]

[Brief description of the drawings]

[0056]

FIG. 1 is a cross-sectional view illustrating a structure of an ultrasonic motor used for a roller pump according to a first embodiment.

[0057]

FIG. 2 is a diagram showing a planar structure and a cross-sectional structure of a vibrating body applied to the ultrasonic motor.

[0058]

FIG. 3 is a diagram showing a planar structure of a piezoelectric element.

[0059]

FIG. 4 is a diagram showing the operation principle of the ultrasonic motor.

[0060]

FIG. 5 shows a specific configuration of an oscillation drive circuit for driving an ultrasonic motor used in the roller pump according to the first embodiment.

[0061]

FIG. 6 is a configuration diagram of an oscillation drive circuit using an analog switch.

[0062]

FIG. 7 is a sectional view showing the structure of the roller pump according to the first embodiment of the present invention.

[0063]

FIG. 8 is a plan view showing the structure of the roller pump according to the first embodiment of the present invention.

[0064]

FIG. 9 is a cross-sectional view showing a deformation of the roller of the roller pump according to the first embodiment of the present invention.

[0065]

FIG. 10 is a sectional view 1 showing a structure of a roller pump according to Embodiment 2 of the present invention.

[0066]

FIG. 11 is a cross-sectional view illustrating a structure of a roller pump according to a second embodiment of the present invention.

[0067]

FIG. 12 is a sectional view showing a structure of a roller pump according to Embodiment 2 of the present invention.

[0068]

FIG. 13 is a sectional view showing a structure of a roller pump according to Embodiment 3 of the present invention.

[0069]

FIG. 14 is a front view showing the internal structure of a conventional roller pump.

[0070]

FIG. 15 is a rear view showing the internal structure of a conventional roller pump.

[0071]

FIG. 16 is a sectional view showing an internal structure of a conventional roller pump.

[0072]

[Explanation of symbols]

 1,2,3 Roller pump 700,720,750 Throttle mechanism 100,140,150 Ultrasonic motor 405 Oscillation drive circuit 101,151 Vibrator 102 Piezoelectric element 107,107a Power transmission protrusion 108,108a, 108b, 108c, 721a, 721b, 721c, 751 Moving body 711 (711a, 711b, 711c, 711d, 711e) Roller 713, 713c Liquid feed tube 714a, 714b Guide surface

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3H077 AA01 CC04 CC10 DD06 DD12 EE36 FF36 FF42 5H680 AA06 AA08 AA12 AA19 BB01 BB16 BC00 CC02 CC06 CC10 DD01 DD15 DD23 DD27 DD53 DD66 DD73 DD84 DD85 DD92 DD97 EE07 FF10 FF27

Claims (7)

[Claims] 1. A roller unit, a guide surface facing the roller unit, and a liquid feed tube arranged along the guide surface, wherein the liquid feed tube filled with liquid is connected to the roller unit. A roller pump having a structure in which the liquid filled in the liquid feed tube is pushed out by moving the roller portion along the guide surface by squeezing with the guide surface, a vibrating body having a piezoelectric element, and the piezoelectric element A power transmission projection provided on the vibrating body for enlarging a displacement of a periodic vibration generated in the vibrating body due to the expansion and contraction of the vibration, and a movement that is brought into pressure contact with the power transmission projection and moved via a frictional force. An ultrasonic motor having a structure in which the moving body and the vibrating body are stacked in the rotation axis direction of the moving body, the ultrasonic motor having: Roller pump that said roller unit is installed, with the installation structure so as to be sandwiched at least a portion of said roller portions between the moving body and the vibrating body, characterized in that the. 2. The roller pump according to claim 1, wherein the moving body has a reduced thickness at the roller mounting portion. 3. The method according to claim 1, wherein
The roller pump according to any one of claims 1 to 3, wherein at least one of the vibrator and the support shaft plays a role of the guide surface. 4. The roller pump according to claim 1, wherein the roller unit includes: a roller pressed against the liquid supply tube; and a roller for rotating the roller. A roller pump comprising: a roller bearing; and a roller shaft for guiding rotation of the roller. 5. The roller pump according to claim 1, wherein the piezoelectric element constituting the ultrasonic motor has a disk shape and is substantially equal to at least one surface. A multiple of 4 electrodes are formed at intervals, and a polarization process is performed so that the direction is alternately reversed for each pair, with two adjacent electrodes as one set, and the electrodes are placed every other electrode. The two sets of electrode patterns are electrically short-circuited, and the power transmission projections provided on the vibrating body are substantially equidistant on at least one plane of the piezoelectric element on one surface of the vibrating body. A roller type pump, which is arranged at every other position near the boundary of the electrodes formed by multiples of 4. 6. The oscillation drive for driving the ultrasonic motor by self-excited oscillation of the vibrating body having the piezoelectric element according to claim 1, wherein: A driving circuit, wherein the oscillation driving circuit is provided on the piezoelectric element.
Two power amplifiers each having an output terminal connected to each of the sets of electrode patterns and independently exciting and driving each of the electrode patterns; and a power amplifier formed on a surface of the piezoelectric element opposite to the surface on which the two sets of electrode patterns are formed. And a pre-power amplifier having an output terminal connected to the input terminals of the two sets of the power amplifiers, the input terminals being connected to the set electrodes, and one of the two power amplifiers being connected to the front end. A roller pump, wherein the ultrasonic motor is driven by setting the power amplifier to an active state, and the rotation direction of the ultrasonic motor is switched depending on which of the two power amplifiers is set to the active state. 7. An electronic apparatus comprising the roller pump according to claim 1. Description: