JPH024382A - Liquid sending pump - Google Patents

Abstract

PURPOSE:To present the compact liquid sending pump of small energy consumption by generating an advance wave in the wall part of a tube in a side pressed by an oscillating body, with the oscillating body and a supporting means, forming one or more rooms in the tube with this advance wave and moving the room in a direction from one edge of the tube to the other edge. CONSTITUTION:When an alternative current voltage is applied from a phase shifter 8 for respective piezo-electric ceramic member 6, the piezo-electric ceramic member 6 is vibrated and on a surface to contact with a tube 4 of an elastic member 5, the advance wave is generated in a direction to be shown in B. At such a time, plural room R are formed in the internal part of the tube 4 and these rooms R are moved in the B-direction. Accordingly, liquid to be received in the room R is also moved in the B-direction and the liquid in the tube 4 is moved in the B-direction. Thus, the compact liquid sending pump of the small energy consuming quantity can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a liquid pump used for transferring extremely small amounts of liquid.

(Prior Art) This type of pump includes a so-called ultra-trace liquid pump used for medical purposes. This ultra-trace liquid pump is suitable for ICU
, When administering anti-arrhythmia agents, vasodilators, etc. to critically ill patients in the CCU, when providing continuous nutritional support to premature infants and newborns, and when administering various hormones, anesthetics, anti-cancer drugs, anti-blood medications to other patients. Necessary when injecting coagulants, antibiotics, cardiotonic drugs, etc. continuously.

Conventional ultra-micro-liquid pumps are mainly of the vestal tick finger type and the syringe type. The former presses an elastic tube to generate a reciprocating motion, and the latter uses a piston to reciprocate within a cylindrical container.

(Problems to be Solved by the Invention) In recent years, it has become desirable for this type of liquid pump to be able to be carried by the bereaved person and to be able to continuously inject the necessary liquid while performing daily activities. . To this end, it is desirable that the device be small in size and consume less power to prolong the life of the battery.

However, conventional ultra-trace liquid pumps could not withstand such applications.

The present invention was made in view of these conventional drawbacks.
The purpose is to provide a liquid pump that is small in size and consumes less power.

[Structure of the Invention] (Means for Solving the Problems) In the first invention, an elastic tube having one end connected to a liquid supply source side and the other end connected to a side requiring the liquid; a vibrating body that is provided along the tube and vibrates to press each part of the tube when driven; and a vibrating body that is provided on the opposite side of the tube from the vibrating body so that the tube is pressed by the vibrating body. a supporting means for supporting the tube so as not to bend in the suppressing direction when the tube is pressed; and a driving means for driving the vibrating body so that the vibration occurs.

The second invention includes an elastic tube whose one end is connected to a liquid supply source and the other end is connected to a side that requires the liquid, and which is provided along this tube and vibrates when driven. a first vibrating body that presses each part of the tube; and a second vibrating body that is provided along the tube on the opposite side of the first vibrating body and that vibrates and presses each part of the tube when driven. A vibrating body and a wall portion of the tube on the side pressed by the first and second vibrating bodies, the waveforms of which are mutually symmetrical and propagating from the one end to the other end of the tube. The vibrator is configured to include driving means for driving the first and second vibrating bodies so as to generate a traveling wave.

(Function) In the first invention, when the driving means drives the vibrating body, a traveling wave is generated on the wall of the tube on the side that is pressed by the vibrating body by the vibrating body and the supporting means. This traveling wave creates at least one chamber in the tube that moves from one end of the tube to the other. Therefore, the liquid contained in that chamber is continuously transferred.

In the second aspect of the invention, when the driving means drives the first and second vibrating bodies, traveling waves whose waveforms are symmetrical to each other are generated on the respective walls of the tube on the side that are pressed by them. These traveling waves create at least one chamber in the tube that moves from one end of the tube to the other. Therefore, the liquid contained in that chamber is continuously transferred.

(Example) A first example is shown in FIGS. 1 to 4. FIG. 2 is a perspective view of the liquid feeding pump main body of the first embodiment, FIG. 1 is an overall configuration diagram of the liquid feeding pump of the first embodiment, and the liquid feeding pump main body is It is shown in a sectional view taken along the line -I. FIG. 3 is a sectional view taken along the line ■--■ in FIG. 2, and FIG. 4 is an explanatory diagram of the operation of the main body of the liquid feeding pump of the first embodiment.

As shown in FIG. 1, the liquid pump of this first embodiment consists of a main body part 1 and a drive part 2. As shown in FIG. The main body 1 includes a box-shaped housing 3 as shown in FIG. 2, an elastic tube 4 provided in the longitudinal direction of the housing 3 along the inner center of the bottom wall 3a of the housing 3, a plate-shaped elastic member 5 provided on the opposite side of the tube 4 from the bottom wall 3a;
An even number of piezoelectric ceramic members 6 are bonded at one end to the upper wall 3b of the housing 3 and arranged at equal intervals, and a plate member 9 is provided at the other end of each voltage ceramic member 6 and presses the elastic member 5. Become. When driven, the piezoelectric ceramic member 6 expands and contracts in the direction A in which the tube 4 is pressed through the plate member 9 and the elastic member 5, and in the opposite direction, as shown in FIG.

As shown in FIG. 1, the drive unit 2 includes an AC power source 7 and a phase shifter 8.
It consists of The phase shifter 8 converts the voltage of the AC power source 7 into a plurality of types of AC voltages having mutually different phase differences, and applies each voltage to one electrode of each piezoelectric ceramic member 6.

Here, the other electrodes of all piezoelectric ceramic members 6 are grounded.

When the phase shifter 8 drives each piezoelectric ceramic member 6, each plate member 9 presses the elastic member 5 so that a traveling wave is generated in the elastic member 5.

Although the connection between the piezoelectric ceramic member 6 and the phase shifter 8 is shown schematically in FIG. 1, they are actually connected via a connector 11 and a cord 10 as shown in FIG. . In this embodiment, the elastic member 5 is a vibrating body, the driving section 2, the piezoelectric ceramic member 6, and the plate member 9 are driving means, and the housing 3 is a supporting means.

Next, the operation of the liquid feeding pump of this embodiment configured as described above will be explained. When each piezoelectric ceramic member 6 is given an alternating current voltage from the phase shifter 8, the piezoelectric ceramic member 6 vibrates,
On the surface of the elastic member 5 that contacts the tube 4, a traveling wave is generated in the direction shown by arrow B in FIG. At this time, the inside of tube 4 is
As shown in the figure, a plurality of rooms R are formed, and these rooms R move in the B direction. Therefore, the liquid contained in the room R also moves in the B direction. In this way, the liquid in the tube 4 becomes B
transported in the direction.

According to this embodiment, since a plurality of piezoelectric ceramic members are provided which are each driven independently, it is possible to reliably generate a traveling wave.

A second embodiment is shown in FIGS. 5 to 10. Figure 5 is the second
FIG. As shown in this figure, in this embodiment, a housing 13 that holds a tube 12 for transferring liquid is formed integrally with a clip 14. A coil spring 16 is provided between the handle portions isa and isb of the clip 14, and this coil spring 16 has tip portions 17a and 17b.
are pressed against each other.

6 is a cross-sectional view taken along the line Vl--VI shown in FIG. 5, and FIG. 8 is a cross-sectional view taken along the line ■--■ shown in FIG. As shown in these figures, the tube 12 is in contact with one wall surface 18 in the housing 13 and a plate-shaped elastic member 19 whose longitudinal ends are attached to the inner wall of the housing 13. held within. The elastic member 19 has a tube 1
A plate-shaped bimorph member 20 is attached to the surface opposite to the surface that contacts 2. The bimorph member 20 is the ninth
As shown in the figure, electrodes 21a are placed at four predetermined locations on one side.
, 21b, 21c, 21cj are provided,
The other side is grounded.

The driving means 22 have a phase difference of 90'' from each other.
The different AC voltages are applied to the electrodes 21a, 21G, and the electrode 21, respectively.
b, 21d. FIG. 5 shows the driving means 2.
Although 2 is not shown, a voltage is applied to the electrodes 21a to 21d of the bimorph member 20 via a cord 23. In this example, bimorph member 2
0 is a vibrating body, and the housing 13 is a supporting means.

Next, the operation of this embodiment will be explained. First, the operator operates the handles 15a and 15b of the clip 14 to
The patient's clothing is held between a and 17b, and the clip 14 is attached to the patient. The operator then starts the operation of the drive means 22. At this time, the bimorph member 20 waves in a direction perpendicular to the surface in contact with the elastic member 19, as shown in FIG. 10, and becomes a traveling wave traveling in the direction of arrow C. Therefore, the tube 12 is pressed in a wavy manner by the bimorph member 20 via the elastic member 19, and as shown in FIG.
is formed. FIG. 7 shows the state in which the tube 12 is pressed at the location shown in FIG. Since such a state moves in the C direction (FIG. 10), for example, the liquid contained in the chamber R in the tube 12 shown in FIG. 10 is transferred in the C direction. Thereafter, the liquid is accommodated and transferred to the portions @R that are successively formed within the tube 12.

According to this embodiment, the liquid pump can be securely attached to the patient's clothing, making it convenient to carry. In this embodiment, electrodes were provided at four locations on the bimorph member 20 and a voltage was applied to the electrodes to drive the bimorph member 20, but generally an even number of electrodes were provided and a voltage was applied to drive the bimorph member 20. A traveling wave may be generated.

A third embodiment is shown in FIGS. 11 and 12. The main body of the liquid pump in this embodiment includes a clip 31 and a clip 31.
It consists of an elastic tube 32 held in a stacked state by the tip portions 31a and 31b of the clip 31, an elastic member 33, a bimorph member 34, and a coil spring 36 provided between the handle portions 31G and 31d of the clip 31. The handle portion 31d is formed in the shape of a flat plate folded back to have a U-shaped cross section.

Reference numeral 35 indicates a groove portion formed by the folded portion of the handle portion 31d. Elastic member 33 and bimorph member 3
4 are plate-shaped and are provided along the tube 32. The bimorph member 34 of this embodiment is similar to that of the second embodiment, and is driven by a vibrating body driving means (not shown). Here, the electrode provided on the bimorph member 34 and the vibrating body driving means are connected via a cord 37.

In this embodiment, the pipe 32 is connected to the elastic member 33.
The operation of the bimorph member 34 that presses through the tube 12 and the bimorph member 20 in the second embodiment is the same as that of the tube 12 and the bimorph member 20 in the second embodiment, so a description thereof will be omitted. The feature of this embodiment is that the clip 31 is attached by press-fitting one end of the patient's clothing into the groove 35 provided in the handle part 31d, and the operator can attach and detach the tube 32 to the clip 31 using the handle parts 31C and 31D.
This is done by operating 1d. Therefore, according to this embodiment, it is extremely easy to attach and detach the liquid pump to and from the patient.

FIG. 13 shows a fourth embodiment. In this embodiment, elastic members 42 and 43 are provided facing each other so as to sandwich the elastic tube 41. The elastic member 42 is attached to the housing 45 through an even number of plate members 54 and piezoelectric ceramic members 44, and the elastic member 43 is attached to the housing 45 via a plurality of plate members 56 and piezoelectric ceramic members 46. There is. When these piezoelectric ceramic members 44 and 46 are driven by a driving means (not shown),
Mutually symmetrical traveling waves are generated on the surfaces of the elastic members 42 and 43 that are in contact with the tube 41. Therefore, as shown in FIG. 14, there are several parts inside the tube 41! The room is divided into R, and the room moves in one direction. Therefore, the liquid contained in the room R is transferred, and the liquid is transferred from one side of the pipe 41 to the other.

According to this embodiment, even if the amplitude of the wave generated on the surface of the elastic member 42, 43 in contact with the tube 41 is small, the tube 41
Since the chamber formed inside can be enlarged, a highly efficient liquid feeding pump becomes possible.

Note that in the above description, a traveling wave refers to a wave that propagates in a fixed direction.

[Effects of the Invention] According to the present invention, it is possible to realize a liquid transfer pump that is small and consumes little energy.

[Brief explanation of the drawing]

Figures 1 to 4 are explanatory diagrams of the first embodiment, Figures 5 to 1
FIG. 0 is an explanatory diagram of the second embodiment, FIGS. 11 and 12 are explanatory diagrams of the third embodiment, and FIGS. 13 and 14 are explanatory diagrams of the fourth embodiment. 4, 12.32.41... tube 5, 19.33.42.43... elastic member 6, , i
4.4B...Piezoelectric ceramic member 20, 34...Bimorph member 3, i3; 45...Housing Fig. 1 Fig. 2 Fig. 1 Agent Patent attorney Book 1) Takashi Fig. 3 Fig. 6 Fig. 7 Figure 8 Figure 9 Figure 10 Figure 12 Figure 13

Claims (2)

[Claims] (1) An elastic tube whose one end is connected to the liquid supply source side and the other end is connected to the side that requires the liquid, and when the tube is installed along the tube and is driven, the tube vibrates. A vibrating body that presses each part; and a support that is provided on the opposite side of the tube from the vibrating body and supports the tube so that it does not bend in the pressing direction when the tube is pressed by the vibrating body. and a driving means for driving the vibrating body so that a traveling wave is generated in a direction from the one end of the tube to the other end of the tube on the side of the wall of the tube that is pressed by the vibrating body. pump. (2) An elastic tube whose one end is connected to a liquid supply source and the other end is connected to a side that requires the liquid, and when the tube is installed along the tube and is driven, the tube vibrates. a first vibrating body that presses each part; a second vibrating body that is provided along the tube on the opposite side of the first vibrating body and vibrates when driven to press each part of the tube; , a traveling wave whose waveform is mutually symmetrical and which travels from the one end to the other end of the tube is formed on the wall portion of the tube on the side pressed by the first and second vibrating bodies, respectively. said first to occur
and a driving means for driving a second vibrating body.