WO2005088132A1

WO2005088132A1 - Roller pump

Info

Publication number: WO2005088132A1
Application number: PCT/JP2005/004116
Authority: WO
Inventors: Shingo Takesawa; Masahiro Ueda
Original assignee: Medicalseed Co., Ltd.; Japan Science And Technology Agency
Priority date: 2004-03-12
Filing date: 2005-03-09
Publication date: 2005-09-22
Also published as: JPWO2005088132A1; TW200533394A

Abstract

In a roller pump, an oscillating roller section is oscillatably attached to a rotor section rotating about a shaft. The oscillating roller section has elastic means for supporting a roller supporting arm so that the arm can oscillate about an arm supporting shaft and pressing the roller supporting arm to the shaft side. The roller supporting arm has on its head side a revolving roller supported so as to be rotatable about the supporting shaft. A stator section surrounds the radially outside of a rotor section. The oscillating roller section can oscillate from an evacuation attitude where the revolving roller revolves about the shaft while in contact with the shaft to an operation attitude where the revolving roller revolves about the shaft with a larger revolution radius.

Description

Specification

Roller type pump Technical field

[0001] The present invention relates to a roller pump capable of delivering a liquid in an elastic tube by providing an elastic tube and giving an ironing action to the elastic tube. The present invention particularly relates to a roller-type pump for sending various liquids in a blood purification device such as an artificial dialysis device, a peritoneal dialysis device, a plasma exchange device, an immunoadsorption device, an artificial heart-lung machine, and a rehydration device.

Background art

[0002] A pump used for sending a liquid such as blood, dialysate, replacement fluid, or physiological saline to a blood purification apparatus needs to be sent without contaminating the liquid. In some cases, roller pumps are mainly used because it is necessary to send the liquid while maintaining the set flow rate accurately or adjusting the flow rate precisely.

[0003] A typical roller-type pump has two or more support means, for example, arms around a pump shaft, as disclosed in, for example, Patent Documents 1 and 2 exemplified below. A rotor is formed by rotatably attaching a roller to the outer peripheral end of each arm, and an appropriate space is provided at an appropriate interval for disposing an elastic tube on the outer peripheral side on which the rotor rotates. It has a basic structure consisting of a stator part.

[0004] In such a conventional roller-type pump, generally, since the elastic tubes are provided, the interval between the pumps is such that rollers revolving around the pump shaft press the elastic tubes against the inner wall of the stator portion. Then, the elastic tube is arranged in such a size that the elastic tube is arranged in a state of being crushed between the inner wall portion of the stator portion and the roller (hereinafter, also referred to as “the size of the crushed state” in the present specification). It was set.

[0005] For example, in the case of a pump having two rollers, when an elastic tube is installed in the pump, the stator portion is formed at an outer peripheral portion of the rotor portion at an angle of 180 degrees or more with respect to the center angle of the rotor portion. The space for arranging the elastic tube, which surrounds the area and is left between one roller and the stator part, is determined by the "crushed state" of the elastic tube. In order to attach an elastic tube between the roller and the stator, which are approximately equal to the dimensions of the state, squeeze the elastic tube with a finger or a jig. It was necessary to push it into the narrow gap between the motor and the stator. Therefore, when the flexible tube is installed in a twisted state, or when the elastic tube is formed with a non-uniformly stretched portion, it is possible to apply an unreasonable load to the elastic tube without any force. Had occurred. Elastic tubing under an excessive load increases the possibility of cracking or breaking during operation of the pump, so the viewpoint of safety is not desirable.

[0006] Therefore, for example, Japanese Patent Application Laid-Open No. 6-218042 (Patent Document 1) discloses that the stator is divided into two parts, a movable casing and a fixed casing, with the pump stopped, and the movable casing is fixed. A pump is disclosed in which an elastic tube is inserted between a roller and an inner wall portion of a stator portion with a casing also separated. In the present invention, the rotor portion having a substantially circular shape in a plan view has a roller having outer peripheral portions at both ends of one diameter.

In other words, the movable casing portion is provided in a region surrounding the rotor portion along the outer circumference thereof, and the movable casing portion is provided in a region having two rollers. Only one roller facing the movable casing leaves a squeezed dimensional gap between the inner wall of the part and the roller. Therefore, when the movable casing is separated from the fixed casing, the distance between one roller facing the movable casing and the inner wall of the stator (movable casing) becomes relatively large, and the elastic tube Can be relatively easily performed.

[0007] Also, Japanese Patent Application Laid-Open No. 6-154310 (Patent Document 2) discloses that if an operator presses several switches in order, an elastic tube can be almost automatically attached between the rotor section and the stator section. Disclose the cut pump! /

Patent document 1: JP-A-6-218042

Patent Document 2: JP-A-6-154310

Disclosure of the invention

Problems to be solved by the invention

[0008] In the roller pump disclosed in Patent Document 1, the number of rollers is limited to two. Therefore, there is a problem that the operation of attaching the elastic tube to the pump for a pump having three or more rollers cannot be performed smoothly and easily. In addition, it is necessary to secure a space around the stator to separate the movable casing from the fixed casing.Therefore, the size of the pump must be larger than the space required for operation. Therefore, it did not always respond to the demands of consumers in terms of reducing the size and space of the device.

[0009] In the roller type pump disclosed in Patent Document 2 described above, the substantially circular rotor portion in plan view is provided at the outer peripheral portions at both ends of one diameter, similarly to the invention of Patent Document 1 described above. Each is provided in a form having rollers, that is, in a form having two rollers, and in addition thereto, at least two sensor means for detecting a relative position between the rotor part and the stator part, and a sensor for the sensor means. And a controller for controlling the rotation of the rotor section based on information from the means. That is, the invention of Patent Document 2 can simplify the operation of the operator only by providing a complicated control mechanism. Therefore, this pump did not always meet the demands of customers in terms of equipment simplification.

[0010] Therefore, there is a demand for a roller-type pump in which the structure of the pump itself is simple while saving space and the operation of attaching the elastic tube to the pump is easy. The request from the public was not yet fully fulfilled.

Accordingly, the present invention provides a roller type pump in which the structure of the pump itself is simple and the operation of attaching the elastic tube to the pump can be easily performed while saving space. Aim.

Means for solving the problem

[0011] The roller pump according to the present invention includes a rotor portion that rotates around a pump shaft that is connected to a motor and rotates; and a stator portion that surrounds the rotor portion. A roller pump in which an elastic tube for feeding liquid is arranged between the pump shaft and the stator portion, wherein the rotor portion is disposed radially outside the pump shaft in a plane perpendicular to the axis of the pump shaft. A rotating frame extending in a rotationally symmetrical shape around the pump shaft; and 2 or a rotationally symmetrical rotation around the pump shaft on the rotating frame. Each of the above-described positions has a swinging roller portion that revolves around a pump shaft as the rotor portion rotates, and the swinging roller portion includes an arm support shaft; A roller support arm that is swingably supported around the support shaft; a roller support shaft that is inserted into the distal end of each of the roller support arms; a revolving roller that is supported to rotate about each of the roller support shafts; and Elastic means for pressing the roller support arm against the pump shaft, wherein the stator portion is disposed radially outside the rotor portion so as to surround at least a part of the rotor portion. The revolving roller portion has a retracted attitude in which the revolving roller contacts the pump shaft by being pressed by the elastic means; and a circumference drawn by an outer edge of the revolving roller when the revolving roller revolves. The trajectory is characterized in that the trajectory swings between an operating posture in which the revolution radius of the axial force of the pump shaft in the locus is larger than the revolution radius in the retracted posture. The oscillating roller unit is configured such that the pump shaft is inserted into the center hole of the rotor unit or a sleeve is inserted between the pump shaft and the revolving roller, so that the oscillating roller unit is brought into the retracted posture force operating posture. Can be changed. That is, the rotor section may have a form in which a pump shaft is inserted in the center in advance, and the pump shaft is separated from the rotor section force. When the pump is operated, the pump shaft is inserted into the center hole of the rotor section. It is also possible to take a form of being used by inserting it into the device.

[0012] In the roller pump of the present invention, the revolving roller assumes a fan shape around the axis of the pump shaft with a central angle being an angle obtained by equally dividing 360 degrees by the number of the revolving rollers. The pump shaft has the same axial force on the radius as the boundary between the sectors, and the stator section is continuous between at least two revolution rollers arranged on the rotor section. It is characterized in that it is provided in the area to be surrounded. It should be noted that even if the orbital radius of the orbiting roller changes, the angle between the two orbiting rollers around the axis of the pump shaft is substantially maintained, and therefore, the range surrounded by the stator portion is the orbital range. It is only necessary to be within a range that continuously surrounds at least two revolving rollers when the revolving radius of the roller is maximized.

[0013] In the roller type pump of the present invention, the axial force of the pump shaft and the distance D1 from the wall surface of the stator portion facing the revolving roller are equal to the outer edge of the revolving roller when the revolving roller revolves in the retracted position. Radius of the orbit drawn by the pump shaft from the axis of the pump shaft rl And between the rotor portion and the stator portion, and is set to be larger than the sum of the outer diameter tl of the elastic tube in an uncrushed state.

[0014] Further, the roller type pump of the present invention is characterized in that, when the revolving roller revolves in the operating posture, the orbital radius r2 of the circumferential locus drawn by the outer edge of the revolving roller from the axis of the pump shaft; The sum of the thickness t2 of the elastic tube, which is arranged between the rotor and the stator and is crushed between the revolving roller and the stator, is set to be equal to the distance D1! / Characters that are characterized by

[0015] Further, the roller type pump of the present invention can adjust the revolution radius r2 in the operating posture in accordance with the thickness of the elastic tube.

The invention's effect

[0016] In the roller pump according to the present invention, the orbital radius rl of the axial force of the pump shaft on the circumferential locus drawn by the outer edge of the orbital roller is such that the orbital roller is in contact with the pump shaft by the elastic means. By inserting the sleeve between the pump shaft and the revolving roller with the retreating posture of a small size, the orbital radius r2 from the axis of the pump shaft of the circumferential locus drawn by the outer edge of the revolving roller is calculated from the revolving radius rl. The axial radius of the pump shaft of the circumferential locus drawn by the outer edge of the revolving roller can also be changed between the operating posture having a relatively large size and the operating posture.

[0017] In the retracted position, the distance D1 from the axis of the pump shaft to the wall surface of the stator portion facing the revolving roller is the circumference drawn by the outer edge of the revolving roller when the revolving roller revolves in the retracted position. The dimension larger by the gap G1 than the sum of the orbital radius rl of the axial force of the pump shaft of the trajectory and the outer diameter tl of the uncrushed elastic tube disposed between the rotor and the stator. Is set to That is, when an elastic tube in an uncrushed state is to be disposed between the rotor and the stator, the outer diameter tl of the elastic tube and the gap G1 are provided between the rotor and the stator. An interval of the size of the sum is provided. As a result, it is not necessary to perform the operation of attaching or detaching the elastic tube while crushing the elastic tube with a hand or a jig.In addition, since there is enough space in the space of the gap G1, it is very easy. It can be carried out. Therefore, bullet The work of arranging and replacing the conductive tube can be performed quickly and accurately.

[0018] In the operating posture, when the revolving roller revolves, the orbital radius r2 of the circumferential locus drawn by the outer edge of the revolving roller from the axis of the pump shaft is located between the rotor portion and the stator portion. The sum of the thickness t2 of the elastic tube disposed and crushed between the revolving roller and the stator portion is set to be equal to the distance D1. Therefore, the orbiting roller moves along the wall of the stator while crushing the elastic tube between the wall of the stator and the wall facing the orbiting roller. Can be applied. As a result, the pump of the present invention can send out the liquid in the elastic tube, similarly to a general roller type pump.

[0019] The roller pump of the present invention takes a retracting posture when the external force does not reduce any force, while inserting the pump shaft into the center hole of the rotor portion or the pump shaft and the revolution roller. The operation posture can be changed by a relatively simple operation of inserting the sleeve between them. Therefore, the change from the retracted posture to the operating posture and the change from the operating posture to the retracted posture can be easily performed.

Further, after the tube is attached to the roller pump, the revolving roller can be kept in the retracted posture until the pump is actually driven. In a typical roller type pump, when the tube is attached to the pump, the roller almost certainly crushes the tube, and the tube keeps crushed continuously while attached to the pump Will be. If the tube is crushed for a long time, the rubber material forming the tube may be damaged. Therefore, by keeping the roller type pump with the tube attached in the evacuation position and in the operating position only during actual operation, it is possible to prevent the tube from being crushed for an unnecessarily long time. can do.

[0021] The sleeve is formed in a cylindrical shape having a substantially constant radius as a whole, but is provided with a tapered portion on the tip side facing the revolving roller of the sleeve. The flow rate can be adjusted by adjusting the degree to which the sleeve is inserted into the revolution roller, or by adjusting the rotation speed of the pump shaft. Therefore, when the rotation speed of the pump shaft is set to a constant value, The degree to which the elastic tube is squashed between the section and the stator section (also referred to herein as the "closing degree") can be adjusted, and this operation can also finely adjust the liquid delivery amount of the roller pump. be able to.

[0022] The adjustment of the closing degree means that the elastic tube is crushed between the revolving roller and the stator portion, but is not completely closed, and therefore, the back pressure (pump Pressure applied to the liquid in a direction opposite to the direction in which the liquid is to be sent), the elastic tube must be open to the extent that the liquid to be sent flows back in the pump. However, even if the elastic tube is completely crushed between the revolving roller and the stator, and the back pressure is applied to the downstream side of the pump, the liquid to be sent cannot flow backward in the pump. The degree to which the revolving roller crushes the elastic tube between itself and the stator portion is adjusted between the state in which the inside of the elastic tube is open to the extent.

Specifically, when the pump of the present invention is connected to the circuit of the heart-lung machine, when the back pressure of lmHO is applied to the downstream side (high-pressure side) of the pump, the revolving roller of the elastic tube and Stator section

2

It is preferable to adjust the closing degree so that the liquid is leaked. For example, if the liquid to be sent is blood, the degree of closure is significantly involved in hemolysis, and if the degree of closure is too high, the degree of hemolysis is likely to increase. Therefore, in order to reduce the possibility of hemolysis, it is necessary to prevent the closing degree from becoming excessive.

[0024] Therefore, in the present invention, the sleeve having a cylindrical shape as a whole and having a tapered tapered portion at the tip is inserted between the revolution roller and the pump shaft, so that the tapered tapered portion serves as the pump. The above-described closing degree can be adjusted depending on how far away from the shaft and how far away the shaft is.

[0025] Further, when the rotation of the pump shaft is stopped in a state where the pump is in the operating posture, it is possible to form a state in which the elastic tube is crushed against at least one revolving roller catheter. For example, even if no solenoid valve is installed in the tube of the liquid feed system, if you want to temporarily stop the liquid feed, the pump shaft should be kept in this operating position. By stopping the rotation of, the flow path can be closed.

[0026] Further, the distance between the rotor section (roller) and the stator section is adjusted according to the degree of insertion of the sleeve. Since the thickness can be reduced, the liquid can be sent at an accurate flow rate corresponding to the thickness of the used tube even when the thickness of the used tube varies in various ways. As a result, even if the range of the number of rotations of the rollers in the pump is limited to a predetermined range due to physical reasons, an elastic tube having an inner diameter and Z or wall thickness that matches the intended flow rate By using, the flow rate can be adjusted in a relatively wide range without depending on only the number of rotations of the roller.

[0027] Further, even when elastic tubes having different thicknesses and inner diameters are used between the operation operation of one pump and the operation operation of the pump performed before that operation, the pump is disassembled. It is not necessary to change the distance between the rotor part (roller) and the stator part, and it is not necessary to change the size of the elastic tube attached to the pump. Even so, the pump can be operated with a controlled flow by substantially adjusting the degree of sleeve insertion. Therefore, the pump of the present invention can exhibit extremely high flexibility (or versatility) for use in a clinical field where time is at stake.

[0028] In the roller type pump of the present invention, since the revolution radius r2 in the operating posture can be adjusted in accordance with the thickness of the elastic tube, various types of elastic tubes having a relatively wide range of wall thickness can be used. Can be used. Further, even when the range of the number of rotations of the pump that can be controlled is not so large, the range of the flow value can be varied within a relatively large range by adjusting the revolution radius r2. The same can be used for tubes in the range of 30 to 350 mlZ, and it is difficult to precisely control the flow rate of 30 mlZ or less. The problem can be further eliminated.

Brief Description of Drawings

FIG. 1 is an exploded perspective view showing a preferred embodiment of a rotor section in a roller pump according to the present invention.

FIG. 2A is a cross-sectional view schematically showing the entire structure of a roller pump according to the present invention.

2B is a cross-sectional view of the cross section taken along the line ΠΒ—ΠΒ in FIG. 2A in the direction of the arrow.

FIG. 3A is an enlarged view of the rotor unit 10 shown in FIG. 2A in a retracted posture, and FIG. FIG. 3B is a cross-sectional view of the cross section taken along line IIIB-IIIB ′ in FIG.

[FIG. 4] FIG. 4Α is a view showing a state corresponding to FIG. 3Α of the rotor unit 10 displaced to the operating posture, and FIG. 4Β is a sectional view of the section taken along line IVB-IVB ′ in FIG. It is.

Explanation of symbols

[0030] 10 ··· Rotor part, 20 ··· Pump shaft, 22 ·· Frame stopper, 23 ··· Lock nut, 24 ··· Set screw, 30 ··· Rotating frame, 32 ···· Central hole , 33, 34, 35 ··· shaft hole, 36, 87 ··· set hole, 40, 41, 42 · · · arm support shaft, 43, 44 · · · Nut Κ 50, 5 3 ... roller support arm , 51 ··· Base hole, 52 ·· Spacer, 53 ··· Roller support arm, 54 ··· Base hole, 56, 57 ··· Tip side hole, 60 ·· Support shaft, 70 · · · revolving roller, 71 · · · elastic means, 72 · · · base, 73, 74 · · · hole, 75, 76 · · · screw, 77, 78 · · · tongue, 80 · · · · Rotating frame, ········································································································································· · Slide mechanism frame, 92 ··· Groove, 93 ··· Rack, 94 ··· Pion, 95 ··· Motor, 100 ··· Motor 101 ... motor shaft, 1 02 ... force pulling means, 110 ... stator, 111 ... wall, 120 ... elastic tube.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the invention of this application will be described with reference to the drawings showing preferred embodiments thereof.

FIG. 1 is an exploded perspective view schematically showing one preferred embodiment of the rotor unit 10 in the invention of the roller pump of the present application.

FIG. 1 shows a pump shaft 20 that protrudes from the sleeve 90 so as to move from the upper left side toward the center of the drawing. A frame stopper 22 is attached to a center part of the pump shaft 20 in the longitudinal direction.

In the embodiment shown in FIG. 1, a rotation frame 30 extending radially outward of the pump shaft in a plane perpendicular to the long axis of the pump shaft 20 and having a disk shape as a whole is shown. A center hole 32 is provided in the center of the rotation frame 30, and the pump shaft 20 is inserted into the center hole 32, and the rotation frame 30 is brought into contact with the frame stopper 22. Regulating the position on the pump shaft 20 it can.

The rotating frame 30 is not limited to a disk shape but may be an elliptical shape or a regular polygonal shape as long as it is rotationally symmetrical around the pump shaft, for example, a triangle, a square, a pentagon, a hexagon, a heptagon. Or various polygonal shapes such as octagons or more polygons, or a shape having a smooth outline as a whole by rounding the vertices of these polygonal shapes, or pumping A ring force having a size and shape that fits on the outside of the shaft 20 also protrudes outward in the radial direction of the pump shaft 20 in a rotationally symmetric direction and form such as two, three, four, five, six, seven, or eight. The shape may be a plurality of arms.

[0036] The rotation frame 30 is provided with a shaft hole for an arm support shaft at a position at an equal radius from the pump shaft 20 and at a position that is rotationally symmetric about the pump shaft 20! In the embodiment shown in FIG. 1, three axial holes 33, 34, and 35 forces are formed by dividing the disk of the rotating frame 30 into three equal parts at a central angle of 120 degrees. The central force is also provided at a position of the same distance. In this way, the revolving roller is defined by a radius that is a boundary between the fan shapes when a fan shape having a central angle of an angle obtained by equally dividing 360 degrees by the number of the revolving rollers is assumed around the axis of the pump shaft. Therefore, it is important that the rotor portion has a rotationally symmetric shape.

One end of each of the arm support shafts 40, 41, 42 is inserted into and fixed to each of the shaft holes 33, 34, 35. As means for fixing the arm support shafts 40, 41, 42 to the rotation frame 30, various means known in related technical fields can be used. In FIG. 1, only the arm support shaft 40 is shown, and the arm support shafts 41 and 42 are omitted for the sake of simplicity. Therefore, in the following description of the rotor section 10, the arm support shaft 40 fixed to the shaft hole 33 and each member attached to the arm support shaft 40 will be mainly described. Even in this case, it is assumed that each of the shaft holes 34 and 35 has the same member force as the arm support shaft 40 fixed to the shaft hole 33 and the members attached to the arm support shaft 40, respectively. I want to be understood. Further, in the present invention, the arm support shaft and each member attached to the arm support shaft can swing about the arm support shaft as a pivot, so that the “swing roller portion” t, May be used generically.

[0038] Examples of means for fixing the above-described arm support shaft 40 to the rotation frame 30 include: The force at one end of the rotation frame 30 can also be engaged with the screw provided at the end of the arm support shaft 40 protruding through the shaft hole 33 to the other end of the rotation frame 30 and the screw. It may be a combination of nuts, or a locking means that can be locked to both the end of the arm support shaft 40 and the shaft hole 33, for example, a screw groove, a key or a knock shaft may be provided. Alternatively, a means such as fixing one end of the arm support shaft 40 to the rotation frame 30 by welding or the like can be employed. Alternatively, the arm support shaft 40 may be formed integrally with the rotation frame 30.

[0039] The arm support shaft 40 fixes the inside of the base end hole 51 of one roller support arm 50, the spacer 52, and the base end hole 54 of the other roller support arm 53 to each member. The two roller support arms 50 and 53 can rotate or swing around the arm support shaft 40 because they are not communicated with each other. The spacer 52 is a cylindrical member for defining the relative distance between the two roller support arms 50 and 53. The length of the spacer 52 in the axial direction is determined by a roller described later. The length is set substantially equal to the axial length of the revolving roller 70 supported on the tip side of the support arm 50. Alternatively, a projecting portion having the same size and shape as the spacer 52 may be integrally formed at the central portion of the arm support shaft 40.

Since both ends of the arm support shaft 40 are fixed to the two rotation frames 30 and 80, both ends of the arm support shaft 40 have means for preventing the two rotation frames 30 and 80 from coming off. Is provided. As such a retaining means, various means known in this technical field can be employed. In the embodiment shown in FIG. 1, threads are formed at both ends of the arm support shaft 40, and nuts 43 and 44 corresponding to the threads at both ends are engaged to serve as retaining means.

In the embodiment shown in FIG. 1, the roller support arm 50 has a broad bean-shaped plane shape, but supports the revolving roller at the distal end side and swings around the arm support shaft at the base end side. The shape is not particularly limited as long as it can fulfill the function of obtaining. A distal end side hole 56 is provided at the distal end side of the roller support arm 50. In FIG. 1, the other roller support arm 53 located relatively on the right side cooperates with the roller support arm 50 located relatively on the left side to move the rotating shaft of the revolving roller 70 from both sides, as described later. Since it is a member for supporting evenly, it is formed in substantially the same size and shape as the roller support arm 50. Therefore, also on the tip side of the other roller support arm 53, a tip side hole 57 is provided at a position corresponding to the tip side hole 56 of the one roller support arm 50.

As shown in FIG. 1, a revolving roller 70 is arranged between the two roller support arms 50 and 53. The orbiting roller 70 has a cylindrical shape as a whole, and is provided with a central through-hole (not shown) which penetrates through the central portions of two bottom surfaces of the cylinder so as to communicate with each other around the central axis.

[0043] With the distal end side hole 56 of one roller support arm 50, the central through hole of the revolving roller 70, and the distal end side hole 57 of the other roller support arm 53 aligned, the rollers are inserted into these. The support shaft 60 is inserted.

The revolving roller 70 is fixed to the roller support shaft 60, so that it can rotate around the roller support shaft 60. At both ends of the roller support shaft 60, stopper means for the two roller support arms 50 and 53 are provided. As such a retaining means, various means known in this technical field can be employed. In the embodiment shown in FIG. 1, female screws are formed at both ends of the roller support shaft 60, and screws 61 and 63 corresponding to the female screws at both ends are engaged to serve as retaining means.

In FIG. 1, the right end portion of the arm support shaft 40 passes through a shaft hole 82 provided in the other rotation frame 80 located on the right side with a directional force, and is locked by retaining means. Is preferred. Since the rotation frame 80 is a member for supporting the arm support shaft 40 equally from both sides in cooperation with the rotation frame 30, the rotation frame 80 is formed in a disk shape having substantially the same size and shape as the rotation frame 30. Have been. Therefore, the shafts 82, 83, 84 in the rotation frame 80 have substantially the same size, shape, and arrangement as the shafts 33, 34, 35 in the rotation frame 30.

The tip of the pump shaft 20 is inserted into a central hole 81 provided at the center of the rotation frame 80, and the tip of the pump shaft 20 protruding from the rotation frame 80 is locked by a retaining means. can do. As such a retaining means, various means known in this technical field can be employed. In the embodiment shown in FIG. A thread is formed at the tip of the shaft 20, and a lock nut 23 corresponding to the thread is engaged as a retaining means.

Further, in the embodiment shown in FIG. 1, in the vicinity of the central portion of the rotation frame 80, the cylindrical protrusion frame 85 is provided so as to protrude rightward from the disk-shaped rotation frame 80 with a directional force. A hole 86 having a female screw is provided on the inner surface on a part of the side surface so as to penetrate to the central hole 81.The rotation frame 80 is formed by screwing a set screw 24 having a male screw corresponding to the hole 86. It can be attached to the pump shaft 20 in a non-rotating state. As a means for attaching the rotation frame 80 to the pump shaft 20 in a non-rotating state, various other non-rotating means known in the art can be employed.

As described above, in the embodiment shown in FIG. 1, the two rotation frames 30 and 80 have a disk-like shape having substantially the same radius, and the pump shaft 20 rotates around its axis. By rotating, the two rotation frames 30 and 80 can also rotate in synchronization with the pump shaft 20.

[0049] Set holes 36 and 87 are provided at the corresponding positions on the outer peripheral surfaces of the two rotation frames 30 and 80, and female screws are provided inside the set holes 36 and 87, respectively. The two mounting holes 73 and 74 provided on the left and right ends of the base 72 of the elastic means 71 corresponding to the set holes 36 and 87 are aligned. 73 and the set hole 36 are locked by the screw 75, and the right mounting hole 74 and the set hole 87 are locked by the screw 76 with the opposing force of the elastic means 71. It is fixed to the rotation frames 30 and 80.

[0050] In this embodiment, the elastic means 71 is formed of a plate-like member having panel elasticity. Two tongues 77 and 78 project downward from the base 72 of the elastic means 71 in the figure. In a state where the elastic means 71 is fixed to the two rotation frames 30 and 80, one tongue 77 abuts against the roller support arm 53 and pushes the roller support arm 53 toward the pump shaft 20 side. The tongue 78 abuts the roller support arm 50 and pushes the roller support arm 50 toward the pump shaft 20. Accordingly, in the rotor section 10 in this state, the revolving roller 70 is pushed by the elastic means 71, so that the pump shaft 2 The evacuation posture that comes into contact with 0 is taken. The elastic means 71 may be a member having elasticity such as rubber instead of the plate-like member having panel elasticity shown here.

Next, the overall configuration of the roller pump in which the rotor unit 10 having the above-described configuration is incorporated will be described with reference to FIG. 2A showing a cross section thereof.

In FIG. 2A, a motor 100 is disposed on the left side, and a motor shaft 101 extends from the motor 100 to the right side of the figure. A right end of the motor shaft 101 is provided with a suitable force pulling means. It is connected by 102 to the left end of the pump shaft 20. A rotor section 10 of a roller type pump is attached to a right end portion of the pump shaft 20, and a stator section 110 is arranged so as to surround the upper and lower sides of the rotor section 10.

[0053] Between the force pulling means 102 and the rotor section 10, a sleeve 90 having a cylindrical shape as a whole and surrounding the pump shaft 20 with a predetermined thickness is arranged. However, the sleeve 90 has a tapered surface 89 which is formed in a tapered shape tapering over a predetermined length near the outer right end. In the embodiment shown in FIG. 2A, the sleeve 90 is located between the rotor section 10 and the motor 100, and the sleeve 90 has a slide for sliding in the longitudinal direction of the pump shaft 20 (left and right in the figure). A mechanism is provided.

In FIG. 2A, FIG. 2B is a cross-sectional view of the cross section taken along line II-B ′ in the direction of the arrow. In the embodiment shown in FIG. 2B, the slide mechanism includes a slide mechanism frame 91 that surrounds the outside of the sleeve 90 as a whole and extends over substantially the entire length of the sleeve 90, and a slide mechanism frame 91 extending in the longitudinal direction of the slide mechanism frame 91. A groove 92 provided on the outer surface of the sleeve 90, a rack 93 provided on a part of the outer surface of the sleeve 90, and protruding the outer surface force of the slide mechanism frame 91 through the groove 92; On the outer surface of the frame 91, at least a pinion 94 provided to be engaged with the rack 93 and a motor 95 for rotating the pinion 94 in a forward or reverse direction are provided. It is formed by a rack and pione mechanism. For such a rack-and-pion mechanism, means known in this technical field can be employed. Not only the rack and pinion mechanism, but also a state in which one tubular member (slide mechanism frame 91) accommodates one long member (sleeve 90), ) From the one long part Various mechanisms capable of changing the relative positional relationship between the one tubular member and the one elongate member between the state where the material (sleeve 90) is protruded and the state where the material (the sleeve 90) is protruded can be adopted.

As another embodiment, the pump shaft 20 can be provided so as to be freely inserted into and removed from the combination of the rotor section 10 and the stator section 110 shown in FIG. 2A. In this case, in FIG. 2A, the rotor 10 is fixed to the pump shaft 20 by using a lock nut 23 at the right end of the pump shaft 20. When the pump is operated, the pump shaft 20 is moved to the left side and right side in the figure, for example, as shown in FIG. 2A, and inserted into the center hole of the rotor section 10 when the pump is operated. be able to. In this case, the rotor unit 10 is in the retracted position in a state where the pump shaft 20 is not inserted, and the rotor unit 10 can be changed to the operating position by inserting the pump shaft 20. Further, in this case, after the pump shaft 20 is inserted, the sleeve 90 can be further inserted into the central hole of the rotor section 10 to change the rotor section 10 to the operating posture. By providing the pump shaft 20 so that it can be freely inserted and removed with respect to the thread of the rotor section 10 and the stator section 110, the configuration of the operation section of the roller pump of the present invention can be simplified, and maintenance such as cleaning can be performed. Performance can be further improved.

[0056] As a mechanism for moving the pump shaft forward and backward, various mechanisms for converting a rotary motion represented by a rack and pinion mechanism into a linear motion can be used. For example, a mechanism for moving the motor 100 and the pump shaft 20 connected to the motor 100 forward and backward in the longitudinal direction of the pump shaft by means of an actuator, the motor 100 being fixed, and a flexible coupling between the motor 100 and the pump shaft 20 And a mechanism that communicates by a crank mechanism or the like.

FIG. 3A is an enlarged view of the rotor unit 10 shown in FIG. 2A in a retracted posture, and FIG. 3B is a cross-sectional view of the cross section taken along line ΠΙΒ—IIIB ′ in FIG. You.

In the roller type pump according to the present invention having the above-described configuration, when the orbital roller 70 revolves in the retracted posture shown in FIGS. 3A and 3B, the outer edge of the orbital roller 70 draws a circle. The trajectory is C1, the revolution radius of the circumferential trajectory C1 of the axial force of the pump shaft 20 (the radius when the revolution roller 70 revolves) is rl, and the axial force of the pump shaft 20 is also Assuming that the distance from the wall 111 facing the revolving roller 70 is Dl, and the distance between the rotor section 10 and the stator section 110 is tl, and the outer diameter of the uncrushed elastic tube is tl, D1 is rl And tl are set to dimensions larger than the sum of tl and tl. That is, G1 (G1 = D1-(rl + tl)), which is the dimension obtained by subtracting the sum of rl and tl from D1, is a positive value, and the distance between the revolving roller 70 and the stator unit 110 in the retracted posture is obtained. Has a space larger than the outer diameter tl of the elastic tube by a gap G1.

[0059] For the roller pump having such a configuration, an operation of disposing an elastic tube between the revolving roller 70 and the stator portion 110, or an operation of disposing the resilient tube already disposed! When removing the space between the revolving roller 70 and the stator portion 110, the space between the revolving roller 70 and the stator portion 110 is larger than the outer diameter tl of the elastic tube in a state in which the resilient tube is not collapsed by the size of the gap G1. It can be done very easily. In particular, when an elastic tube is provided between the revolving roller 70 and the stator unit 110, it is not necessary to push the elastic tube into the gap between the roller and the stator unit while crushing the elastic tube with a finger or a jig. Can be prevented from being twisted or provided with a non-uniformly stretched part to the pump.

[0060] In the roller pump of the present invention, the space of the sum of the outer diameter tl of the elastic tube in the collapsed state and the gap G1 can be used for mounting the elastic tube. It is easy to attach the elastic tube housed in another case member etc., instead of attaching only the elastic tube between 70 and the stator part 110, and without applying an excessive load to the elastic tube. be able to. For example, a case member having a flow path or a circuit formed by arranging an elastic tube so as to meet a specific purpose is attached to the roller type pump of the present invention together with the case member, whereby the elastic tube can be revolved around the revolution roller 70. It is also possible to install between the and the stator part 110.

FIG. 4A is a diagram showing a state corresponding to FIG. 3A of the rotor unit 10 displaced to the operating posture, and FIG. 4B is a cross-sectional view of the cross section taken along line IVB-IVB ′ in FIG. Is shown.

[0062] This operating posture is such that the left-hand force in the figure is also the thickness SL between the revolving roller 70 of the rotor part 10 and the pump shaft 20 after the elastic tube is attached in the retracted posture as described above. Corresponding to the state in which the sleeve 90 having In accordance with this operating posture, when the orbiting roller 70 revolves, the circumferential locus drawn by the outer edge of the revolving roller 70 is C2, and the orbital radius of the circumferential locus C2 of the axial force of the pump shaft 20 (revolution If the radius of the roller 70 revolves), the revolving radius r2 in the operating position is larger than the revolving radius r1 in the retracted position by the thickness SL of the sleeve 90. That is, there is a relationship of r2 = rl + SL.

Further, assuming that the thickness of the elastic tube squashed between the roller 70 and the stator portion 110 is t2, as in the case of FIG. Assuming that the distance from the wall 111 to the wall 70 is D1, the relation D1 = (r2 + t2) t is established between D1, r2, and t2.

The change in dimensions between the retracted position and the operating position has the following meaning. That is, the distance D1 from the axis of the pump shaft 20 to the wall surface 111 of the stator portion 110 is the same between the retracted position and the operating position. When the orbiting roller 70 revolves, the orbital radius of the circumferential locus drawn by the outer edge of the orbiting roller 70 is rl in the retracted position, and is the dimension obtained by adding the sleeve thickness SL to the rl in the retracted position. Become r2! /

[0065] Therefore, in the retracted position in which the elastic tube is attached to the pump, a space having the sum of tl and G1 can be secured as a space for the elastic tube to pass through. In the operating position for operation, the space for the elastic tube to pass through when the sleeve 90 is inserted is limited to t2, which is the sum of tl and G1 minus the sleeve thickness SL. Become. Since the dimension t2 substantially corresponds to the thickness of the elastic tube in the crushed state, the pump of the present invention in the operating posture is similar to the elastic roller pump in a general roller type pump. It can send the liquid with the ironing effect.

FIG. 4A shows a state in which a sleeve 90 is inserted between the revolution roller 70 and the pump shaft 20 to a portion having a substantially uniform radius beyond the tapered surface 89. In the roller type pump of the invention, the degree to which the sleeve 90 is inserted between the revolving roller 70 and the pump shaft 20 is determined by the degree to which the tapered surface 89 of the sleeve 90 is kept between the revolving roller 70 and the pump shaft 20. , Part of the tapered surface 89 of the sleeve 90 and the left end of the revolving roller 70 Operating in a state in which is in contact with is also included in the operating conditions. Like this sleeve

When the pump is operated in a state where a part of the tapered surface 89 of the 90 and the left end of the revolving roller 70 are in contact with each other, the closing degree of the tube can be adjusted.

[0067] In this case, the degree to which the sleeve 90 is inserted into the revolving roller 70 is determined by a flow meter provided in the elastic tube for liquid feeding at a location outside the mouthpiece pump of the present invention. Adjustments can be made based on the information received. For example, when the rotation speed of the pump shaft 20 is fixed due to a problem on the motor side, when the speed adjustment range is narrow, or when the speed cannot be finely adjusted, the closing pressure of the tube is reduced. By adjusting, the flow rate of the liquid can be adjusted. Alternatively, if the rotation speed of the motor can be adjusted, it is possible to adjust the flow rate by adjusting the rotation speed of the motor or by combining the adjustment of the closing degree of the tube with the adjustment of the rotation speed of the motor. it can.

[0068] Therefore, the roller pump in the operating position, along with the wall facing the revolving roller of the stator, crushes the elastic tube between the roller pump and the stator, similar to a general roller pump. Therefore, the ironing action can be performed on the elastic tube. As a result, the roller type pump of the present invention can deliver the liquid in the elastic tube while maintaining an accurate flow rate or precisely adjusting the flow rate. The elastic tube 120 is connected to a tube of the same or different type as the elastic tube 120 by joint means 121, 122, etc., outside the rotor unit 10, and is provided with an artificial dialysis device, a peritoneal dialysis device, a plasma exchange device, When various liquids are sent to a blood purification device such as an immunoadsorption device, an artificial heart-lung machine, or a rehydration device, they are further contacted with a supply source and a Z or a destination for fulfilling a predetermined purpose. be able to.

[0069] For the revolving roller 70, various plastic rubber materials used as rollers of a roller pump in this technical field can be used. On the other hand, as a material of the sleeve 90, when inserted between the pump shaft 20 and the revolving roller 70, the elastic means piles on the force of pressing the roller support arm against the pump shaft by pushing the roller support arm toward the pump shaft, thereby reducing its thickness. A material that has an appropriate hardness and Z or rigidity that can be maintained and has a relatively small surface friction coefficient compared to rubber materials, such as polyethylene, polypropylene, polyacetal, and fluorine-based materials.榭 Resin or other metal materials, such as stainless steel It is preferable to use stainless steel, aluminum, aluminum alloys, and various ceramic materials. This means that, with respect to the function of the pump, the orbiting roller 70 preferably rotates without slipping between the elastic tube, while the orbiting roller 70 slips between the sleeve 90 and the pump shaft 20. This is because it is not really a problem. Therefore, the sleeve 90 is not necessarily required to be formed as one member as long as the sleeve 90 can cause a moderate slip between the revolving roller 70 and the pump shaft 20, or the inner layer and the outer layer, or the like. A multi-layer structure including the above-described layers, or a structure including a main body that does not contact a tip portion that contacts the revolving roller 70 may be used.

Claims

The scope of the claims

[1] a rotor portion that rotates around a pump shaft that is connected to a motor and rotates; and a stator portion surrounding the rotor portion, for feeding liquid between the rotor portion and the stator portion. A roller type pump provided with an elastic tube of

A rotation frame extending radially outward of the pump shaft in a plane perpendicular to the axis of the pump shaft in a rotationally symmetrical shape around the pump shaft; and Oscillating rollers provided at two or more positions rotationally symmetric around the pump, and revolving around a pump shaft as the rotor rotates.

The swing roller portion includes an arm support shaft; a roller support arm that is swingably supported around each of the arm support shafts; a roller support shaft that is inserted into the distal end side of each of the roller support arms; A revolving roller rotatably supported around a support shaft; andelastic means for pressing the roller support arm against the pump shaft by force, wherein the stator portion is radially outside the rotor portion. , Disposed to surround at least a part of the rotor portion,

The oscillating roller portion is in a retracted position in which the revolving roller contacts the pump shaft by being pushed by the elastic means; and when the revolving roller revolves, the circumferential locus drawn by the outer edge of the revolving roller moves from the axis of the pump shaft. A roller type pump that swings between an operating position in which the orbital radius is larger than the orbital radius in the retracted position.

[2] By inserting the pump shaft into the center hole of the rotor section and inserting a sleeve between Z or the pump shaft and the revolving roller, the swing roller section is changed from the retracted position to the operating position. The roller type pump according to claim 1, wherein:

[3] The orbiting roller is defined by a radius which is a boundary between the sectors when assuming a sector around the axis of the pump shaft having a center angle of an angle obtained by equally dividing 360 degrees by the number of the orbiting rollers. In the above, the axial force of the pump shaft is also provided at a position at an equal distance, and the stator portion is provided in a range continuously surrounding at least two revolving rollers provided on the rotor portion. 3. The roller type pump according to claim 1, wherein:

[4] The axial force of the pump shaft is also the distance D from the wall of the stator section facing the revolving roller. 1 is a distance between the revolution radius rl of the circumferential locus drawn by the outer edge portion of the revolving roller from the axis of the pump shaft when the revolving roller revolves in the retreat position, and the rotor portion and the stator portion. The roller pump according to any one of claims 13 to 13, wherein the pump is arranged to be larger than the sum of the outer diameter tl of the elastic tube in an uncrushed state.

[5] When the revolving roller revolves in the operating position, the revolving radius r2 of the circumferential locus drawn by the outer edge of the revolving roller from the axis of the pump shaft is disposed between the rotor portion and the stator portion. The roller according to claim 4, wherein the sum of the thickness t2 of the flexible tube in a state of being crushed between the revolving roller and the stator portion is set to be equal to the interval D1. Type pump.

6. The roller type pump according to claim 15, wherein the revolution radius r2 in the operating posture is adjusted according to a thickness of the elastic tube.

[7] Based on the information from the flow meter provided on the elastic tube for liquid feeding, the revolving radius r2 of the axial force of the pump shaft of the circumferential locus drawn by the outer edge of the revolving roller in the operating posture is adjusted. A roller pump according to any one of claims 1 to 6.

8. The roller-type pump according to claim 7, wherein the rotation speed of the pump shaft is adjusted based on information from a flow meter provided on the elastic tube for feeding liquid.