JP2019090337A - Peristaltic pump device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a peristaltic pump device capable of easily attaching and detaching a tube serving as a flow path and reducing the size of the device. SOLUTION: A peristaltic pump device includes a tube 9 for passing a fluid, a tube holder 2 for holding the tube 9, a base 1 on which two tube holders are mounted, and a rotor 3 rotatably mounted on the base 1. A roller 31 that is pivotally supported on the rotor 3 and rotates by crushing the tube 9 is provided. A substantially U-shaped tube holding groove 21 is formed on the joint surface of the tube holder 2 on the base 1 side, and the depth of the tube holding groove 21 is formed shorter than the outer diameter of the tube 9. When the tube 9 is inserted into the tube holding groove 21, the tube 9 is held in the tube holding groove 21 due to the frictional resistance due to the restoring elastic force of the tube 9. [Selection diagram] Fig. 4

Description

  The present invention relates to a peristaltic pump device that supplies minute fluids such as various reagents through a tube, and more particularly to a peristaltic pump device that can be easily attached and detached and that can be miniaturized.

  Conventionally, a peristaltic pump (peristor, in which a plurality of rollers are rotatably supported by a circular rotor, the outer peripheral surface of each roller of the rotor is pressed against the tube, and fluid in the tube is fed while rotating the rotor) A lysis pump) is known, for example, from the following patent document 1.

Japanese Patent Application Publication No. 2007-523284

  However, in the conventional peristaltic pump of this type, a circular rotor rotationally driven by a motor rotatably supports a plurality of rollers on its outer peripheral portion, and a supporting shaft of each roller is in a direction perpendicular to the rotational axis of the rotor It is arranged so that, when the rotor rotates, the outer peripheral surface of each roller is pressed against the tube (flexible conduit), and the fluid is fed while rotating the roller of the rotor while pressing it against the tube. .

  For this reason, since the reaction force of the load that each roller presses the tube is applied perpendicular to the rotation shaft of the motor, the rotational load of the motor increases, and in particular, the microfluidic fluid such as culture fluid, various reagents, etc. In a small-sized peristaltic pump device used for cell culture, reagent screening, chemical analysis and the like by flowing in a flow path, there has been a problem that the motor becomes large and it is difficult to miniaturize the entire pump.

  Also, peristaltic pumps of this type usually do not allow easy removal of the tube section from the pump casing, which includes the rotor. For this reason, when supplying a chemical | medical solution etc., a tube can not be easily attached to the roller part of a rotor, and it can not attach removably, but a subject that a used tube can not be simply disposable or wash | cleaned was there.

  The present invention is to solve the above-mentioned problems, and it is an object of the present invention to provide a peristaltic pump device which can easily attach and detach a tube serving as a flow path and can miniaturize the device.

In order to achieve the above object, the peristaltic pump device of the present invention is
A tube for passing fluid, a tube holder for holding the tube, a base on which the tube holder is mounted, a rotor rotatably mounted on the base, and a tube supported on the rotor and crushed In a peristaltic pump device comprising:
A tube holding groove is formed in the joint surface on the base side of the tube holder, the depth of the tube holding groove is formed shorter than the outer diameter of the tube, and when the tube is inserted into the tube holding groove The depth of the tube holding groove is formed so that the tube is held in the tube holding groove by the frictional resistance due to the elastic resiliency of the tube.

  According to the peristaltic pump device of the present invention, the tube holding groove is formed in the joint surface on the base side of the tube holder, and the depth of the tube holding groove is formed shorter than the outer diameter of the tube. Since the tube is held in the tube holding groove by the frictional resistance due to the elastic elasticity of the tube when inserted into the tube, the tube can be easily removed from the tube holding groove of the tube holder by removing the tube holder from the base. It can be removed. Also, the tube holder can be made very thin, and the peristaltic pump device can be sufficiently miniaturized.

  Here, in the joint surface on the base side of the tube holder, a concave portion is formed to allow a part of the rotor to enter, and a positioning convex portion is provided substantially at the center of the joint surface to abut on the rotor for positioning. can do. According to this, it is possible to prevent excessive crushing of the tube due to the variation of dimensions of each member, the variation of elastic force of the spring member, the variation of inner and outer diameters of the tube, or the variation of elasticity of the tube. And the amount of crushing can be made constant. Preferably, the rotor is provided with a spring member which is axially movably held on the base and biases the rotor toward the tube holder. Moreover, it is preferable to comprise so that a tube may be removably exposed when the said tube holder is removed from a base.

  Here, preferably, the amount of protrusion of the tube from the tube holding groove is larger than the inner diameter of the tube. According to this, when the roller squeezes the tube, the squeezing amount of the tube can be properly secured.

  According to the peristaltic pump device of the present invention, the tube serving as the flow passage can be easily attached and detached, and the device can be miniaturized.

1 is a perspective view of a peristaltic pump device of the present invention. It is the perspective view from the direction which changed the angle of the peristaltic pump apparatus. It is a perspective view of the state which removed the tube holder. It is the perspective view seen from the downward state of the state which removed the tube holder. It is a disassembled perspective view of a peristaltic pump apparatus. It is an exploded perspective view of a rotor. It is a bottom view of a tube holder. It is a VIII-VIII sectional view of FIG. FIG. 8 is a cross-sectional view taken along the line IX-IX in FIG. It is sectional drawing along the longitudinal direction of a peristaltic pump apparatus. It is sectional drawing along the longitudinal direction of the peristaltic pump apparatus of use condition. It is sectional drawing of the peristaltic pump apparatus of the state which removed the tube holder. It is a fragmentary sectional view which shows the internal diameter of a tube, and the amount of protrusion of a tube.

  Hereinafter, an embodiment of the present invention will be described based on the drawings. This peristaltic pump device comprises a tube 9 for passing fluid, a tube holder 2 for holding the tube 9, a base 1 to which the tube holder 2 is mounted, a rotor 3 rotatably mounted on the base 1, and a rotor 3 And a roller 31 pivotally supported on the upper side and crushing and rotating the tube 9.

  As shown in FIG. 4, the tube holder 2 has a plate-like main body 20, and a recess 22 is formed so that the roller 31 of the rotor 3 can enter on one side of the plate-like main body 20, that is, the inner side of the rotor 3 side. On the other side, an abutment 25 is formed which abuts on the cover 11 of the base 1. The plate-like main body 20 of the tube holder 2 is thickly formed by the contact portion 25 which abuts on the cover 11 of the base 1 and thinly formed at the concave portion 22 where the roller 31 of the rotor 3 enters.

  As shown in FIGS. 4 and 7, a substantially U-shaped tube holding groove 21 is formed continuously to the recess 22 and the contact portion 25. The substantially U-shaped tube holding groove 21 is formed to open outward at the side surface of the contact portion 25 and to bend the tube 9 into a U shape to be introduced into and drawn out from the pump.

  Further, the depth f1 of the tube holding groove 21 in the recess 22 is formed shorter than the outer diameter r1 of the tube 9 as shown in FIG. 9, and the width w1 of the tube holding groove 21 is the tube 9 as shown in FIG. It is formed longer than the outer diameter r1 of. Further, as shown in FIG. 9, the depth f2 of the tube holding groove 21 at the contact portion 25 is formed to be substantially the same as the outer diameter r1 of the tube 9.

  Thereby, when the tube 9 is inserted into the tube holding groove 21 in a U-shape by bending, the frictional resistance due to the elastic resiliency of the tube 9 ensures that the tube 9 is in the tube holding groove 21 in the contact portion 25. It is held. The tube 9 in the tube holding groove 21 in the recess 22 can be crushed well by the roller 31.

  Further, as shown in FIG. 13, the protrusion amount r3 of the tube 9, that is, the amount by which the tube 9 protrudes from the tube holding groove 21 (outer diameter r1−depth f1) is formed larger than the inner diameter r2 of the tube 9. As a result, when the roller 31 squeezes the tube 9, the squeezing amount of the tube 9 is properly secured.

  The tube 9 is a very thin tube having, for example, an outer diameter of about 2 mm and an inner diameter of about 0.5 mm, which is formed of a flexible material having elasticity such as thermoplastic elastomer and silicone rubber and bent in a U shape. When a circular arc-shaped channel is formed and when it is crushed by the roller 31, a good restoring elastic force is generated. Although the tube holding groove 21 is formed in a U shape as shown in FIG. 7, it may be in the shape of an arc, and it is possible to use a tube which is inserted along the rotation locus of the roller 31 by bending into the groove. If it is the shape which produces, it does not matter as arc shape.

  The tube holder 2 is detachably disposed on the base 1, and a mounting holder 4 for holding the tube holder 2 is provided between the base 1 and the tube holder 2. The attachment holder 4 includes a magnet holding shaft 4 a attached to one of the tube holder 2 or the base 1 and a holding hole 4 b provided in the other of the tube holder 2 or the base 1. In the embodiment, the holding shaft 4a is provided on the base 1 so as to protrude, the holding hole 4b is formed on the lower surface of the tube holder 2 so that the holding shaft 4a can be tightly inserted, and the magnet piece 4c is attached in the holding hole 4b. .

  As shown in FIG. 4, holding holes 4 b of the mounting holder 4 are formed at four corners of the inner side surface of the tube holder 2, and magnet pieces 4 c are attached to the back of these holding holes 4 b. At four positions corresponding to the fixed position on the base 1, that is, the holding holes 4b, magnet holding shafts 4a are provided so as to project upward. When the four holding shafts 4a are inserted into the holding holes 4b, the holding shafts 4a are closely fitted into the holding holes 4b, and the magnet piece 4c and the holding shaft 4a of the magnet are attracted to each other. As a result, the tube holder 2 is detachably mounted to the base 1 in a state where the tube holder 2 is accurately positioned without rattling. One of the magnet holding shaft 4a and the magnet piece 4 may be made of a magnetic material such as stainless steel.

  Furthermore, as shown in FIG. 4, a recess 22 is formed in the surface of the tube holder 2 on the base 1 side to allow a part of the rotor 3 to enter and is positioned in contact with the rotor 3 substantially at the center of the concave surface. Positioning projections 23 are provided. That is, the pin-shaped positioning convex portion 23 is provided so as to protrude downward substantially at the center of the concave portion 22 of the tube holder 2.

  When the tube holder 2 is mounted at a position covering the rotor 3 on the base 1, the positioning protrusion 23 abuts on the rotor 3, and the tube holder 2 is attached to the base 1 (the mounting position (with respect to the rotor 3). Position is set correctly.

  The rotor 3 is rotatably mounted together with the rotation shaft 6 on the rotation shaft 6 vertically provided in the base 1 so as to be movable in the axial direction (vertical direction in FIG. 10). As shown in FIG. 10, a spring member (coil spring) 8 is externally fitted to the rotating shaft 6, and the spring member 8 biases the rotor 3 to the tube holder 2 side. The amount of crushing of the tube 9 is determined by the position of the tube 9 with respect to the roller 31 and the spring force of the spring member 8, and the spring force of the spring member 8 is set so as to produce an appropriate amount of crushing.

  The base 1 has a case 10 formed in a substantially rectangular parallelepiped shape, and is formed by covering the case 10 with a plate-like cover 11. As shown in FIG. 5, the circular opening 12 is formed at the end of the cover 11, and the upper portion of the rotor 3 pivotally supported in the case 10 is exposed and slightly protrudes from the circular opening 12. Is attached. The rotor 3 is axially supported inside the circular opening 12 on the vertically supported rotational shaft 6 and urged upward by the spring member 8, thereby being urged upward by elastic force. , Disposed in the circular opening 12.

  As shown in FIG. 5, the motor 7 is attached to the end in the case 10 in a lateral direction parallel to the longitudinal direction of the case 10. Further, in the vicinity of the tip end portion in the case 10, the rotary shaft 6 is rotatably supported in the vertical direction of FIG. 10 (longitudinal direction) via a bearing. A spur gear 14 is shaft-mounted on the rotation shaft 6, and the rotation shaft 6 is linked to a gear mechanism 5 composed of a plurality of spur gears and pinions via the spur gear 14. The output shaft of the motor 7 is linked via the worm 13 to the input side of the gear mechanism 5. Thus, when the motor 7 is started, the rotary shaft 6 and the rotor 3 are rotationally driven at low speed via the gear mechanism 5.

  As shown in FIG. 10, the gear mechanism 5 meshes the spur gear 14 attached to the rotation shaft 6 with the pinion 52 of the rotation shaft 51 adjacent thereto, and the rotation gear 53 coaxial with the pinion 52 is adjacent to the rotation shaft It is meshed with the pinion 55 of 54. Further, a spur gear 56 coaxial with the pinion 55 is meshed with the pinion 58 of the rotating shaft 57 adjacent thereto, and a spur gear 59 coaxial with the pinion 58 is meshed with the worm 13 provided on the output shaft of the motor 7 The gear mechanism 5 is configured. The rotation speed of the output shaft of the motor 7 is decelerated by the gear mechanism 5 to rotationally drive the rotation shaft 6 of the rotor 3 at a low speed. Further, the gear mechanism 5 is configured to be thin so as to shorten the thickness dimension of the base 1, and the thickness of the base 1 is minimized by horizontally housing the small-sized motor 7 in the case 10. .

  As shown in FIG. 6, the rotor 3 has a disk-like substrate 32 in which openings 32 a for three rollers 31 are formed, a roller 31 disposed in each opening 32 a, and a substrate 32 from above the rollers 31. And a disk-like cover 33 which is fixed by being put on top. In the disk-like substrate 32, three openings 32a are circumferentially formed at equal intervals, that is, at intervals of about 120 degrees, and a flange 32b is formed on the periphery of the substrate 32.

  As shown in FIG. 6, the flange 32 b is formed so that the flange 32 b can contact the inside of the cover 11 when the rotor 3 is inserted into the circular opening 12 from the inside of the circular opening 12 of the cover 11 of the base 1. The upper limit of the rotor 3 biased upward by the spring member 8 is set by the flange 32b. As shown in FIG. 10, an axial hole 32c is bored in the center of the bottom of the base plate 32 of the rotor 3, and the tip of the rotary shaft 6 is rotatably fitted in the axial hole 32c.

  As shown in FIGS. 6 and 10, also in the cover 33, three openings 33a are formed at equal intervals and at positions corresponding to the respective openings 32a of the substrate 32. The rollers 31 each having the support shaft 31a provided on the shaft center are accommodated in the openings 32a provided in the substrate 32, the support shaft 31a is positioned on the substrate 32, and the cover 33 is placed thereon.

  Thereby, the support shaft 31 a of the roller 31 is rotatably held between the cover 33 and the substrate 32 by the cover 33. In this state, the fixing screw 34 is inserted into the hole 33 b to clamp and fix the cover 33 and the substrate 32. As a result, the three rollers 31 are rotatably held on the substrate 32 at intervals of about 120 degrees via the support shaft 31a. As shown in FIG. 10, the rotor 3 provided with such rollers 31 holds the rollers 31 rotatably while supporting the rollers 31 in a state where the upper portions of the rollers 31 are exposed from the opening 33a of the cover 33 and protrude. Be done.

  When the rotor 3 is attached to the base 1, as shown in FIG. 5, the shaft hole 32 c at the center of the bottom of the substrate of the rotor 3 is fitted on the rotation shaft 6 of the base 1, and the cover 11 is then covered on the case 10 Attach. As shown in FIG. 5, the spring member 8 is externally fitted to the rotation shaft 6 in advance. Thus, the rotor 3 is mounted on the base 1 in such a manner as to project the upper part of each roller 31 and to be biased upward by the spring member 8.

  Next, the usage form and operation of the peristaltic pump device of the above configuration will be described. This peristaltic pump device is used, for example, when a minute fluid such as various reagents is caused to flow through the flow path of the tube 9 to supply the reagents and the like.

  The tube 9 used removes the tube holder 2, and inserts the tube 9 in the tube holding groove 21 of the inner surface of the tube holder 2 like FIG. At this time, the substantially straight tube 9 is bent in a U-shape in a free state and inserted into the tube holding groove 21. At this time, a restoring elastic force is generated in the tube 9 itself, and the tube in a bent state The outer side surface 9 abuts the inner surface of the tube holding groove 21.

  Thereby, a frictional resistance is generated between the tube 9 and the tube holding groove 21, the tube 9 is held in the tube holding groove 21, and is well held even in a state where the tube holder 2 is inverted. In particular, the tube holding groove 21 of the concave portion 22 of the tube holder 2 holds the tube 9 in a good squeezed form, and good holding performance is ensured in the deep tube holding groove 21 of the contact portion 25.

  As described above, the tube 9 can be easily set in the proper position and reliably held in the fixed position only by removing the tube holder 2 and inserting the tube 9 into the tube holding groove 21. Moreover, when replacing | exchanging the tube 9 for every use, it can replace | exchange a tube very easily and can perform disposable use of a tube easily.

  Next, the tube holder 2 in which the tube 9 is set is attached at a position covering the rotor 3 of the base 1. At this time, as shown in FIG. 12, the tube holder 2 can be easily attached simply by fitting the holding hole 4b of the tube holder 2 into the holding shaft 4a provided on the base 1 so as to protrude. That is, when the holding hole 4b of the tube holder 2 is fitted into the holding shaft 4a, the holding shaft 4a closely enters the holding hole 4b, is attracted to the magnet piece 4c, and the tube holder 2 is fixed on the base 1 It can be easily attached in position and without rattling.

  When the tube holder 2 is attached to a fixed position on the base 1, as shown in FIG. 11, the roller 31 is in a state where the tube 9 is crushed by the biasing force of the spring member 8. In this state, as shown in FIG. 11, the positioning projection 23 of the tube holder 2 abuts on the center of the rotor 3. For this reason, even if there is a variation in dimensions of each member, a variation in inner / outer diameter or elastic force of the tube 9, or a variation in spring force of the spring member 8, the tube 9 is crushed by a certain amount of crushing be able to.

  In this state, when the motor 7 is started, the rotor 3 rotates and the roller 31 freely rotates while crushing the tube 9. At this time, the load with which the roller 31 presses the tube 9 is applied in parallel to the rotation shaft 6. Therefore, the rate at which the rotational load of the rotor 3 is increased by the pressure load of the roller 31 is very small. Therefore, even if the motor 7 is very small and has a low output, the rotor 3 can be rotationally driven to feed the liquid in the tube 9 and used to supply a chemical solution or the like.

  Then, when the use is finished, the tube holder 2 is removed from above the base 1 and the tube 9 is removed from the tube holding groove 21 of the tube holder 2. At this time, attachment and removal of the tube holder 2 can be performed by simply grasping the tube holder 2 by the operation of the finger, since fixing screws and hooks and the like do not use fixing devices.

  As described above, in the peristaltic pump device configured as described above, the tube holding groove 21 is formed in the joint surface of the tube holder 2 on the base 1 side, and the depth f1 (FIG. 9) of the tube holding groove 21 is the outer diameter of the tube 9 The tube 9 is shorter than r1 (FIG. 7), and when the tube 9 is inserted into the tube holding groove 21, the tube 9 is held in the tube holding groove 21 by the frictional resistance due to the elastic resiliency of the tube 9. Can be easily removed from the tube holding groove 21 of the tube holder 2. Moreover, the tube holder 2 can be formed very thin, and the peristaltic pump device can be sufficiently miniaturized.

Reference Signs List 1 base 2 tube holder 3 rotor 4 mounting holder 4a holding shaft 4b holding hole 4c magnet piece 5 gear mechanism 6 rotation shaft 7 motor 8 spring member 9 tube 10 case 11 cover 12 circular opening 13 worm 14 spur gear 20 flat body 21 Tube holding groove 22 concave portion 23 positioning convex portion 25 abutting portion 31 roller 31a support shaft 32 base plate 32a opening 32b flange 32c shaft hole 33 cover 33a opening 33b hole 51 rotation shaft 52 pinion 53 spur gear 54 rotation shaft 55 pinion 56 spur gear 57 Rotating shaft 58 Pinion 59 Spur gear

Claims (5)

A tube for passing fluid, a tube holder for holding the tube, a base on which the tube holder is mounted, a rotor rotatably mounted on the base, and a tube supported on the rotor and crushed In a peristaltic pump device comprising:
A tube holding groove is formed in the joint surface on the base side of the tube holder, and the depth of the tube holding groove is formed shorter than the outer diameter of the tube, and when the tube is inserted into the tube holding groove A peristaltic pump device, wherein a depth of the tube holding groove is formed such that the tube is held in the tube holding groove by a frictional resistance due to a restoring elastic force of the tube.   A recess is formed in the joint surface on the base side of the tube holder so as to allow a part of the rotor to enter, and a positioning convex portion is provided substantially at the center of the joint surface to abut on and position the rotor. A peristaltic pump device according to claim 1, characterized in that.   The peristaltic pump device according to claim 1, wherein the tube is removably exposed when the tube holder is removed from the base.   2. The peristaltic pump device according to claim 1, further comprising a spring member which is axially movably held on the base and which biases the rotor toward the tube holder. The peristaltic pump device according to claim 1, wherein an amount of protrusion of the tube from the tube holding groove is formed larger than an inner diameter of the tube.

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