JP2007061389A - Finger-type tube pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a finger-type tube pump which can decrease the pulsation. <P>SOLUTION: The finger-type tube pump 100 sends the liquid in an elastic tube 1 by linearly arranging and fixing the elastic tube 1 on a rectangular and tabular base 10 along its longitudinal direction and by arranging the elastic tube 1 to cross slantly to an axis and successively squeezed by ten fingers 30A-30J driven by a motor 20. The fingers 30A-30J are rotatably supported by a rod 15. An output shaft of a deceleration gear box 21 connected to the motor 20 is connected to an end of a driving shaft 22 disposed in parallel to the rod 15. The other end of the driving shaft 22 is rotatably supported by a shaft bearing (23) fixed to a second frame plate 12. Also, ten cams (24A-24J) are fixed to the driving shaft 22 to independently oscillate the individual fingers 30A-30J. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a finger-type tube pump that sends liquid in an elastic tube by sequentially crushing elastic tubes arranged linearly by a plurality of fingers driven by a motor along the axial direction.

  This kind of finger-type tube pump is disclosed in, for example, Patent Document 1. The finger-type tube pump disclosed in Patent Document 1 includes eight fingers that are driven by a motor to reciprocate. The elastic tube is arranged in a straight line, and each finger is formed in a straight bar shape. By reciprocating perpendicularly to the axial direction of the elastic tube, the elastic tube can be crushed at its tip. Then, the rotation of the motor is transmitted to the fingers via the cam mechanism, so that the peristaltic motion (peristaltic motion) is performed, and the elastic tube is sequentially crushed to send out the liquid in the elastic tube.

Japanese Patent Laid-Open No. 9-262283

  By the way, in the case of a finger type tube pump that transports the liquid in the elastic tube by crushing the elastic tube using a plurality of fingers in this way, the flow rate becomes large when one finger crushes the elastic tube. The liquid is then pumped out, the finger starts crushing the elastic tube, the flow begins to return, and the flow decreases until the next finger starts crushing the elastic tube. Pulsation occurs in the liquid (liquid feeding).

FIG. 5 is an explanatory view schematically showing the correspondence between the finger crushing location 1a with respect to the elastic tube 1 of the conventional finger-type tube pump described in Patent Document 1 and the change of the flow rate with respect to time.
In this case, each finger crushes the elastic tube 1 perpendicularly to the axial direction. For this reason, as shown in the characteristic diagram at the bottom of FIG. 5, there is always a time when the flow rate of the fluid becomes zero. A state in which the difference is large occurs alternately and continuously in the elastic tube, and the liquid feeding is supplied.
In this way, in the method of supplying the liquid with a large difference between the peaks and troughs of the flow rate, the liquid supply force itself in the elastic tube is accompanied by a large pulsation, so that the liquid is also fed with a relatively large pulsation. There was a problem of being.
By the way, in this kind tube pump, liquid foods, such as blood, a chemical | medical solution, and soy sauce, are objected as the fluid supplied. Therefore, because of the nature of these supply fluids, they should be supplied smoothly with as little pulsation as possible, and there has been a demand for providing a finger-type tube pump that can supply this fluid with less pulsation.

  The present invention has been made in view of the above-described problems of the prior art, and an object (problem) thereof is to provide a finger type tube pump capable of reducing pulsation.

  In order to achieve the above object, the finger type tube pump according to claim 1 of the present invention is elastic by sequentially crushing elastic tubes arranged linearly by a plurality of fingers driven by a motor along the axial direction. In the configuration for feeding the liquid in the tube, each finger is set so as to obliquely intersect the axis of the elastic tube so as to crush the elastic tube.

  In this case, in the finger type tube pump, as described in claim 2, the plurality of fingers are rotatably supported by a common rotation shaft with the rotation shaft as a fulcrum. A drive shaft parallel to the shaft is connected, and a plurality of cams for independently swinging each finger are fixed to the drive shaft, and the angles of each cam are sequentially shifted by a predetermined angle, One of the fingers always presses the elastic tube, and each finger extends obliquely from the fulcrum part, the fulcrum part through which the rotating shaft passes, the sliding part in contact with the cam. It is conceivable to provide a finger-type tube pump comprising a pressing portion that crushes the elastic tube.

According to the finger type tube pump of claim 1 of the present application, the elastic tube is crushed so that each finger obliquely intersects the axial direction of the elastic tube. Is greatly relaxed, and the pulsation of the fluid during liquid feeding can be kept small.
This state is schematically shown in the explanatory diagram of FIG. 6, as shown in FIG. 6, since the pressing force by a plurality of fingers is applied to the elastic tube 1 from an oblique direction as indicated by 1 a. As for the fluctuation of the flow rate of the liquid in the elastic tube 1 as shown in the lower diagram of FIG. Therefore, it is possible to smoothly and appropriately supply a target fluid such as blood, chemicals, and liquid food.

  Moreover, according to the structure of Claim 2, since each finger can be supported by the common rotation axis | shaft, a structure can be simplified rather than the case where each finger is supported independently.

  In addition, since the fingers are always pressed against the elastic tube by arranging the cam angles sequentially shifted by a predetermined angle, all fingers sequentially press the elastic tube appropriately by one rotation of the drive shaft. Since it can be peristally moved so as to be crushed by pressure, the fluid to be supplied can be smoothly and properly supplied with a pulsation that does not interfere with practical use.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a finger type tube pump according to the present invention will be described with reference to the drawings. 1 to 3 show a finger type tube pump 100 according to an embodiment, FIG. 1 is a perspective view seen from the front side where an elastic tube is arranged, FIG. 2 is a perspective view seen from the back side, FIG. Is a front view.

  As shown in FIGS. 1 to 3, the finger type tube pump 100 is arranged by fixing and fixing the elastic tube 1 linearly along the longitudinal direction on a rectangular plate-like base 10, and is driven by a motor 20. In this example, ten fingers 30A to 30J are used to send the liquid in the elastic tube 1 by sequentially crushing the elastic tube 1 along the axial direction.

Two parallel frame plates 11 and 12 that stand vertically from the base surface with a predetermined interval in the longitudinal direction are fixed to the base 10. The first and second frame plates 11 and 12 are fixed to each other by three rods 13, 14 and 15, and a motor 20 is fixed to the first frame plate 11 via a reduction gear box 21. Yes.
The first and second rods 13 and 14 are fixed to the side opposite to the elastic tube 1, and the third rod 15 is fixed to the elastic tube 1 side. And this 3rd rod 15 becomes a common rotation axis which supports fingers 30A-30J so that rotation is possible.

  Further, fixing means for fixing and holding the elastic tube 1 are provided at both ends of the base 10 in the longitudinal direction. One fixing means includes a holding plate 16a formed perpendicular to the base 10 along the longitudinal direction of the base 10, and a tube clamp 17a for holding the elastic tube 1 between the holding plate 16a. It is composed of Similarly, the other fixing means includes a presser plate 16b and a tube clamp 17b. The elastic tube 1 is fixed to the base 10 by being pushed in between the holding plate and the tube clamp from above. When removing the elastic tube, the elastic tube 1 is pulled out while pulling the tube clamps 17a, 17b away from the elastic tube 1.

  The output shaft of the reduction gear box 21 connected to the motor 20 is connected to one end of a drive shaft 22 that is provided in parallel to the rotation shaft (third rod) 15. The other end of the drive shaft 22 is rotatably supported by a bearing 23 (see FIG. 2) fixed to the second frame plate 12. And 10 cams 24A-24J (refer FIG. 2) which rock | fluctuate each finger | toe 30A-30J independently are being fixed to the drive shaft 22 so that it may rotate integrally.

  Each of the fingers 30A to 30J can swing like a seesaw with the rotation shaft 15 as a fulcrum, and is set so as to obliquely intersect the axis of the elastic tube 1 and crush the elastic tube 1. Specifically, the finger 30A includes a cylindrical fulcrum portion 31A through which the rotation shaft passes, a sliding portion 32A that extends from the fulcrum portion to one side and contacts the cam 24A, and is slanted from the fulcrum portion to the other side. And a pressing portion 33 </ b> A that crushes the elastic tube 1. On the other hand, the cam 24A has a protrusion only in one direction on the circumference, and when the drive shaft 22 rotates and the protrusion of the cam 24A pushes up the sliding part 32A of the finger 30A, the finger 30A moves the fulcrum part 31A. It rotates about an axis, and the pressing portion 33A crushes the elastic tube 1. The other fingers 30B to 30J and the cams 24B to 24J have the same configuration.

  Each of the cams 24 </ b> A to 24 </ b> J may be fixed to the drive shaft 22 so that the direction of the protruding portion is sequentially shifted by, for example, 36 ° when the number of fingers is 10 as illustrated. In addition, what is necessary is just to set the number of fingers and an angle to an optimal value with an applicable model.

  With the above configuration, when the motor 20 is rotated, the drive shaft 22 is rotated via the reduction gear box 21, and the cams 24A to 24J fixed to the drive shaft 22 are also rotated. When the protruding portions of the cams 24A to 24J push up the sliding portions of the fingers 30A to 30J in order, the fingers 30A to 30J rotate in turn with the fulcrum portion as a fulcrum, and the pressing portion sequentially crushes the elastic tube 1. For example, when the pressing portion 32A of the finger 30A crushes the elastic tube 1 and starts to separate, the pressing portion of the adjacent finger 30B crushes the elastic tube 1, and the fingers 30C to 30J subsequently crush the elastic tube 1 in order. And when the press part of the last finger 30J begins to leave | separate from the elastic tube 1, the first finger 30A crushes the elastic tube 1 again. By such a peristaltic motion of the fingers 30A to 30J, the elastic tube 1 is squeezed, and the liquid in the tube is sent in the direction of arrow F in the figure.

  According to the embodiment, since each finger crushes the elastic tube so as to obliquely intersect the axial direction of the elastic tube, the pressing force of each finger against the elastic tube is relaxed to an appropriate value. The pulsation of the fluid at the time can be suppressed to an appropriate value, and the fluid can be supplied smoothly.

In paragraph numbers 0004 and 0009, the conventional example and the present invention were compared using FIGS. 5 and 6 shown in a simulated manner, respectively, and FIG. 4 shows an actual comparison characteristic diagram of both.
That is, FIG. 4 shows a finger type tube pump 100 according to an embodiment of the present invention that crushes an elastic tube so that each finger obliquely intersects the axial direction of the elastic tube, and each finger extends in the axial direction of the elastic tube. It is a graph which compares and shows the flow rate change characteristic with the finger type tube pump of the prior art example which crushes an elastic tube so that it may cross | intersect perpendicular | vertical with respect to it. The vertical axis represents the flow rate, and the horizontal axis represents time. As shown in this graph, in the embodiment of the present invention, the width of the change in the flow rate is smaller than that of the conventional example, and the pulsation at the time of liquid feeding can be suppressed small.

  The finger-type tube pump of the present invention can be used as a liquid or liquid feed pump for medical devices such as artificial dialysis machines, or as a liquid feed pump for liquid foods such as soy sauce or edible oil.

It is the perspective view which looked at the finger type tube pump concerning an embodiment of the invention from the front. It is the perspective view which looked at the finger type tube pump shown in FIG. 1 from the back surface. It is a front view of the finger type tube pump shown in FIG. It is a graph which compares and shows the change of the flow volume of the finger type tube pump of embodiment of this invention, and the finger type tube pump of a prior art example. It is explanatory drawing which shows the response | compatibility of the change with respect to the location which the finger crushes with respect to the elastic tube of the finger type tube pump of a prior art example, and the flow volume with respect to time. It is explanatory drawing which shows the response | compatibility of the change with respect to the location where the finger crushes with respect to the elastic tube of the finger type tube pump of this invention, and the flow volume with respect to time.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Finger type tube pump 1 Elastic tube 1a Finger crushing location 10 Base 11, 12 Frame board 13, 14 Rod 15 Rod (rotating shaft)
20 motor 21 reduction gear box 22 drive shaft 23 bearing 24A-24J cam 30A-30J finger 31A-31J fulcrum part 32A-32J sliding part 33A-33J pressing part 31, 32, 33 rotor

Claims (2)

In the finger type tube pump that sends the liquid in the elastic tube by sequentially crushing the elastic tube arranged linearly by a plurality of fingers driven by a motor along the axial direction,
Each said finger is set so that it may cross | intersect diagonally with respect to the axis line of the said elastic tube, and may crush the said elastic tube, The finger type tube pump characterized by the above-mentioned.   The plurality of fingers are supported on a common rotation shaft so as to be rotatable about the rotation shaft, and a drive shaft parallel to the rotation shaft is connected to the motor. A plurality of cams for independently swinging each finger are fixed, and the angles of each cam are sequentially shifted by a predetermined angle so that any finger always presses the elastic tube. And each said finger is provided with the fulcrum part which the said rotating shaft penetrates, the sliding part which contacts the said cam, and the press part which extends diagonally from the said fulcrum part and crushes the said elastic tube. The finger type tube pump according to claim 1 characterized by things.

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