JPWO2005088132A1 - Roller type pump - Google Patents

Abstract

In a roller type pump, a swing roller unit is swingably attached to a rotor unit that rotates about a shaft. The swing roller portion swingably supports a roller support arm having a revolving roller rotatably supported around a support shaft on the tip side around the arm support shaft, and further presses the roller support arm toward the shaft side. Having elastic means. The stator portion surrounds the outer side of the rotor portion in the radial direction. The swing roller portion can swing from the retracted posture in which the revolution roller revolves around the shaft in a state of being in contact with the shaft, to the working posture in which the revolution roller revolves around the shaft with a larger revolution radius.

Description

  TECHNICAL FIELD The present invention relates to a roller pump in which an elastic tube is arranged and a liquid in the elastic tube can be delivered by applying an ironing action to the elastic tube. The present invention particularly relates to a roller-type pump for delivering 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 device, and a replacement fluid device.

  In a blood purification device, as a pump used to deliver liquid such as blood, dialysate, replacement fluid or physiological saline, it is necessary to deliver the liquid without being contaminated, and the set flow rate must be accurate. Roller-type pumps are mainly used because it is necessary to deliver liquid while maintaining or precisely adjusting the flow rate.

  A typical roller type pump has two or more supporting means, for example, arms, arranged around a pump shaft, as disclosed in, for example, Patent Documents 1 and 2 illustrated below, and the outer circumference of each arm. It comprises a rotor portion which is rotatably attached to the tip end side thereof, respectively, and a stator portion which is arranged at an appropriate interval for arranging elastic tubes on the outer peripheral side on which the rotor portion rotates. It has a basic structure.

  In such a conventional type roller pump, generally, since the elastic tube is arranged, the interval is such that the roller revolving around the pump shaft presses the elastic tube against the inner wall of the stator section. Was set in advance to such a size that the elastic tube is arranged in a crushed state between the inner wall portion of the portion and the roller (hereinafter, also referred to as "crushed state dimension" in the present specification). ..

  For example, when installing an elastic tube in a pump having two rollers, the stator portion encloses a range of an angle of 180 degrees or more with respect to the central angle of the rotor portion in the outer peripheral portion of the rotor portion. The space for disposing the elastic tube left between one roller and the stator part is substantially equal to the “crushed state size” of the elastic tube, and the space between the roller and the stator part is When the elastic tube is to be attached, it is necessary to crush the elastic tube with a finger or a jig and push the crushed elastic tube into a narrow gap between the roller and the stator portion. Therefore, the elastic tube was attached in a twisted state, or the elastic tube was attached in a state in which a non-uniformly extending portion was formed, and an unreasonable load was often applied to the elastic tube. .. An elastic tube to which an excessive load is applied has a high possibility of cracking or breaking during the operation of the pump, and is not desirable from the viewpoint of safety.

  Therefore, for example, in Japanese Patent Laid-Open No. 6-218042 (Patent Document 1), the stator portion is divided into two parts, a movable casing and a fixed casing, in a state where the pump is stopped, and the movable casing is separated from the fixed casing. Disclosed is a pump that inserts the elastic tube between the inner wall portion of the stator portion and the roller in the state. In the present invention, the rotor portion, which is substantially circular in plan view, is provided in such a manner that the outer peripheral portions of both ends having one diameter have rollers, that is, two rollers, and the movable casing portion is the stator. Since the portion is provided in the area surrounding the rotor portion along its outer circumference, there is a crushed state of the space between the inner wall portion of the stator portion and the roller. Is only one roller that faces the movable casing. Therefore, when the movable casing is separated from the fixed casing, the distance between the one roller facing the movable casing and the inner wall portion of the stator portion (movable casing) becomes relatively large, and the elastic tube exists there. It is possible to relatively easily perform the work of attaching.

Further, Japanese Patent Laid-Open No. 6-154310 (Patent Document 2) discloses a pump in which an elastic tube can be installed between a rotor part and a stator part substantially automatically if an operator sequentially presses several switches. ing.
JP-A-6-218042 JP-A-6-154310

  In the roller type pump disclosed in the above-mentioned Patent Document 1, the number of rollers is limited to two. Therefore, for a pump having three or more rollers, the work of attaching the elastic tube to the pump is smooth and easy. There was a problem that it could not be done. Further, since it is necessary to secure a space around the stator portion for separating the movable casing from the fixed casing, it is necessary to provide the pump with a size larger than the size of the space required for operation. However, it has not always been possible to meet the demands of consumers in terms of downsizing the device and saving space.

  In the roller type pump disclosed in the above-mentioned Patent Document 2, as in the invention of the above-mentioned Patent Document 1, the substantially circular rotor portion in plan view has rollers at both ends of one diameter. In addition to this, it has at least two sensor means for detecting the relative position of the rotor portion and the stator portion, and information from the sensor means. And a controller for controlling the rotation of the rotor unit based on the above. 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 does not always meet the demand of the user in terms of simplification of the device.

Therefore, there is still a demand from a customer for a roller type pump that is space-saving, has a simple structure of the pump itself, and can easily perform an attaching operation of the elastic tube to the pump. It wasn't filled enough.
Therefore, it is an object of the present invention to provide a roller-type pump that is space-saving, has a simple structure of the pump itself, and can easily perform an attaching operation of an elastic tube to the pump. And

  The roller type pump of the present invention comprises a rotor portion which rotates about a pump shaft which is connected to a motor and which rotates; and a stator portion which surrounds the rotor portion, and the rotor portion and the stator portion. A roller type pump in which an elastic tube for liquid feeding is arranged, wherein the rotor portion is in a plane perpendicular to the axis of the pump shaft, radially outward of the pump shaft, and around the pump shaft. A rotation frame extending in a rotationally symmetric shape; and; provided on the rotation frame at two or more positions rotationally symmetrical about the pump shaft, and revolving around the pump shaft as the rotor section rotates. An oscillating roller portion is provided, and the oscillating roller portion includes an arm supporting shaft; a roller supporting arm that is oscillatably supported around each of the arm supporting shafts; and a tip end side of each of the roller supporting arms. Roller supporting shafts; revolving rollers rotatably supported around the respective roller supporting shafts; and elastic means for pressing the roller supporting arms toward the pump shaft, and the stator portion includes the rotor. Is arranged so as to surround at least a part of the rotor portion on the outer side in the radial direction of the portion, and the swing roller portion has a retracted posture in which the revolving roller is brought into contact with the pump shaft by being pushed by the elastic means; When the revolving roller revolves, the revolving roller oscillates between an operating position in which a revolving radius from the axis of the pump shaft of a circumferential locus drawn by the revolving roller is larger than the revolving radius in the retracted position. And The rocking roller part changes the rocking roller part from the retracted position to the working position by inserting the pump shaft into the center hole of the rotor part or by inserting the sleeve between the pump shaft and the revolution roller. You can That is, the rotor part may have a form in which the pump shaft is inserted through the central part in advance, or the pump shaft is separated from the rotor part, and when the pump is operated, the pump shaft is inserted into the central hole of the rotor part. It is also possible to take the form of inserting into and using.

  In the roller type pump of the present invention, the revolving rollers have a fan shape having a center angle of an angle obtained by equally dividing 360 degrees by the number of the revolving rollers, and when the fan shape is assumed to be around the pump shaft. They are provided at positions that are equidistant from the axis of the pump shaft on the boundary radius, and the stator portion is provided in a range that continuously surrounds between at least two revolution rollers arranged on the rotor portion. It can be characterized by being. Even when the revolution radius of the revolution roller changes, the angle between the two revolution rollers around the axis of the pump shaft is substantially maintained, and therefore the range surrounded by the stator part means the revolution roller. It is sufficient if the range is such that at least two orbiting rollers are continuously surrounded when the orbiting radius becomes maximum.

  In the roller type pump of the present invention, the distance D1 from the axis of the pump shaft to the wall surface of the stator portion facing the revolution roller is a circle drawn by the outer edge of the revolution roller when the revolution roller revolves in the retracted posture. It is set to be larger than the sum of the revolution radius r1 of the circumferential locus from the axis of the pump shaft and the outer diameter t1 of the elastic tube which is arranged between the rotor portion and the stator portion and is not crushed. It can also be characterized by being.

  Further, in the roller type pump of the present invention, when the revolution roller revolves in the operating posture, the revolution radius r2 from the axis of the pump shaft of the circumferential locus drawn by the outer edge portion of the revolution roller, the rotor portion and the rotor portion The sum of the elastic tube disposed between the stator section and the revolution roller and the stator section and the thickness t2 of the elastic tube is set equal to the distance D1. You can also

  Further, in the roller type pump of the present invention, the revolution radius r2 in the operating posture can be adjusted according to the wall thickness of the elastic tube.

  In the roller type pump of the present invention, the revolution radius r1 from the axis of the pump shaft in the circumferential locus drawn by the outer edge of the revolution roller is relatively small in a state where the revolution roller is in contact with the pump shaft by the elastic means. By inserting the sleeve between the retracted posture and the pump shaft and the revolution roller, the revolution radius r2 from the axis of the pump shaft of the circumferential locus drawn by the outer edge of the revolution roller is relatively greater than the revolution radius r1. It is possible to change the revolution radius from the axis of the pump shaft of the circumferential locus drawn by the outer edge of the revolution roller between the operating posture having a large dimension.

  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 such that when the revolving roller revolves in the retracted position, the outer peripheral portion of the revolving roller draws a circumferential locus of the pump shaft. The dimension is set to be larger by the gap G1 than the sum of the revolution radius r1 from the axis and the outer diameter t1 of the elastic tube that is arranged between the rotor portion and the stator portion and is not crushed. .. That is, when the elastic tube in the uncrushed state is to be arranged between the rotor portion and the stator portion, the sum of the outer diameter t1 of the elastic tube and the gap G1 is provided between the rotor portion and the stator portion. Are provided at intervals of the size. 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, and since there is a spatial margin corresponding to the size of the gap G1, it is very easy. Can be done. Therefore, the work of disposing or replacing the elastic tube can be performed quickly and accurately.

  Further, in the operating posture, when the revolution roller revolves, it is arranged between the rotor portion and the stator portion, and the revolution radius r2 from the axis of the pump shaft of the circumferential locus drawn by the outer edge portion of the revolution roller. The sum of the thickness t2 of the elastic tube crushed between the revolution roller and the stator portion is set to be equal to the distance D1. Therefore, the revolving roller moves along the wall surface of the stator part while crushing the elastic tube between the revolving roller and the wall surface of the stator part facing the revolving roller, and the ironing action is applied to the elastic tube during the movement. You can As a result, the pump of the present invention can deliver the liquid in the elastic tube similarly to a general roller type pump.

  The roller type pump of the present invention takes the retracted posture when no force is applied from the outside, while inserting the pump shaft into the central hole of the rotor portion or inserting the sleeve between the pump shaft and the revolution roller. The operating posture can be changed by a relatively simple operation of doing. Therefore, it is possible to easily change from the retracted posture to the working posture and from the working posture to the retracted posture.

  Further, after the tube is attached to the roller type pump, the revolution roller can be maintained in the retracted posture until the pump is actually operated. In a typical roller type pump, when a tube is attached to the pump, the roller almost certainly crushes the tube, and while the tube is attached to the pump, the tube is continuously crushed. Become. If the crushed state of the tube continues 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 retracted posture and putting it in the operating posture only during actual operation, it is possible to prevent the tube from being crushed for an unnecessarily long time. it can.

  Further, the sleeve is formed into a cylindrical shape having a substantially constant radius as a whole, but a tapered portion is provided on the tip side of the sleeve facing the revolution roller. The flow rate can be adjusted by adjusting the degree of insertion of the sleeve with respect to the revolution roller or by adjusting the rotational speed of the pump shaft. Therefore, when the rotation speed of the pump shaft is set to a constant value, the elastic tube is crushed between the rotor portion and the stator portion depending on the degree to which the sleeve is inserted (also referred to as “compression degree” in this specification). ) Can be adjusted, and the liquid delivery amount of the roller type pump can also be finely adjusted by this operation.

  The adjustment of the degree of compression is that the elastic tube is crushed between the revolving roller and the stator part but is not completely closed, and therefore the back pressure (the pump does not collect liquid When pressure is applied to the liquid in the opposite direction to the direction in which the liquid is to be sent), the inside of the elastic tube is open to the extent that the liquid to be sent flows backward in the pump, and the elastic tube is revolved around the revolution roller. Is completely crushed between the stator and the stator, and even if back pressure is applied to the downstream side of the pump, the inside of the elastic tube is opened to the extent that the liquid to be sent cannot flow back through the pump. The state in which the revolving roller crushes the elastic tube between itself and the stator portion is adjusted.

Specifically, when the pump of the present invention is connected to the circuit of the heart-lung machine, when a back pressure of 1 mH ₂ O is applied to the downstream side (high pressure side) of the pump, the revolution roller of the elastic tube and the stator section It is preferable to adjust the degree of compression so that the liquid leaks from the portion crushed in between. For example, when the liquid to be sent is blood, the degree of closure is largely involved in hemolysis, and when the degree of closure is too high, the degree of hemolysis is likely to increase. Therefore, in order to suppress the possibility of hemolysis to a low level, it is necessary to prevent the degree of pressure closure from becoming excessive.

  Therefore, in the present invention, since the sleeve having a cylindrical shape as a whole and having a tapered taper portion at the tip is inserted between the revolution roller and the pump shaft, the tapered taper portion causes the revolution roller to be separated from the pump shaft. The degree of compression can be adjusted depending on the degree of separation.

  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 at least one revolution roller crushes the elastic tube against the stator portion. For example, even if no solenoid valve is installed in the tube of the liquid delivery system, if you want to temporarily stop the liquid delivery, the pump shaft should be in the operating position in this way. The flow passage can be closed by stopping the rotation of.

  In addition, since the distance between the rotor (roller) and the stator can be adjusted depending on the degree of insertion of the sleeve, even if the wall thickness of the tube to be used varies variously, the wall thickness of the tube to be used can be changed. Liquid can be sent at an accurate flow rate according to the thickness. As a result, even if the range of the number of rotations of the rollers in the pump is limited to a predetermined range for physical reasons, an elastic tube having an inner diameter and/or a wall thickness adapted to the target flow rate can be provided. By using it, the flow rate can be adjusted in a relatively wide range without depending only on the rotation speed of the roller.

  Furthermore, even when using elastic tubes having different wall thicknesses and inner diameters between the operation of one pump and the operation of the pump performed before that, the pump must be disassembled and the rotor part Even if the work such as changing the set dimension of the gap between the (roller) and the stator is not required, and the wall thickness and inner diameter of the elastic tube attached to the pump are changed, The flow rate can be adjusted to operate the pump by substantially adjusting the degree of sleeve insertion. Therefore, the pump of the present invention can exhibit extremely high flexibility (or flexibility) for use in the clinical field, which is a matter of time.

  In the roller type pump of the present invention, since the revolution radius r2 in the operating posture can be adjusted according to the wall thickness of the elastic tube, it is possible to use various elastic tubes having a relatively wide range of wall thickness values. it can. Further, even when the controllable pump rotational speed range is not so large, the flow rate range can be varied within a relatively large range by adjusting the revolution radius r2, so that 1 to 30 ml/ It is possible to use a tube for the range of minutes or a tube for the range of 30 to 350 ml/minute in the same manner, and it is difficult to precisely control the flow rate of 30 ml/minute or less. The problems of the pump can be solved further.

FIG. 1 is an exploded perspective view showing a preferred embodiment of a rotor portion in a roller pump of the present invention. 2A is a sectional view schematically showing the structure of the entire roller pump of the present invention, and FIG. 2B is a sectional view of the section taken along the line IIB-IIB′ in FIG. 2A as observed in the arrow direction. FIG. 3A is an enlarged view of the rotor unit 10 shown in FIG. 2A in the retracted posture, and FIG. 3B is a cross-sectional view of the cross section along the line IIIB-IIIB′ in FIG. 3A observed in the arrow direction. FIG. 4A is a view 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 the line IVB-IVB′ in FIG. 4A as observed in the arrow direction.

Explanation of symbols

  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 Holes, 40, 41, 42... Arm support shafts, 43, 44... Nuts, 50, 53... Roller support arms, 51... Proximal end holes, 52... Spacers, 53... Roller support arms, 54... Proximal end holes, 56, 57... Tip side hole, 60... Roller support shaft, 70... Revolution roller, 71... Elastic means, 72... Base part, 73, 74... Hole, 75, 76... Screw, 77, 78... Tongue piece, 80... Rotating frame, 81... Central hole, 82, 83, 84... Shaft hole, 85... Overhanging part, 86... Hole, 87... Set hole, 90... Sleeve, 91... Sliding mechanism frame, 92... Groove part, 93... Rack, 94... Pinion, 95... Motor, 100... Motor, 101... Motor shaft, 102... Coupling means, 110... Stator part, 111... Wall surface, 120... Elastic tube.

  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 preferable embodiment of a rotor portion 10 in the roller type pump invention of this application.

  In FIG. 1, the pump shaft 20 is shown extending from the upper left side toward the center of the drawing so as to project from the sleeve 90. A frame stopper 22 is attached to an intermediate portion of the pump shaft 20 in the longitudinal direction.

  The embodiment shown in FIG. 1 shows a rotation frame 30 that extends radially outward of the pump shaft in a plane perpendicular to the long axis of the pump shaft 20 and has a disc shape as a whole. 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 to pump the rotation frame 30. The position on the shaft 20 can be regulated.

  The rotation frame 30 is not limited to a disc shape as long as it has a rotationally symmetric shape around the pump shaft, and may have an oval shape or a regular polygonal shape such as a triangle, a quadrangle, a pentagon, a hexagon, a heptagon, an octagon, or Various polygonal shapes such as more polygons, or the shape having a smooth outline as a whole by rounding the vertices of these polygonal shapes, or fitting on the outside of the pump shaft 20 may be used. The shape of a plurality of arms projecting from a ring having a size and shape to the outer side in the radial direction of the pump shaft 20 in a rotationally symmetric direction and shape such as two-way, three-way, four-way, five-way, six-way, seven-way, eight-way. May be.

  A shaft hole for the arm support shaft is provided in the rotation frame 30 at a position having an equal radius from the pump shaft 20 and at a position rotationally symmetrical about the pump shaft 20. In the embodiment shown in FIG. 1, the three axial holes 33, 34, and 35 are arranged on the radii that are the boundaries of each sector formed by dividing the disc of the rotation frame 30 into three equal parts at a central angle of 120 degrees. Are located at equal distances from the center of. In this way, the revolving roller has a radius above the boundary between the respective fan shapes when a fan shape is assumed around the axis of the pump shaft, with the center angle being the angle obtained by dividing 360 degrees by the number of the revolving rollers. It is important to make the rotor part rotationally symmetrical by providing the rotor part.

  One end of each arm support shaft 40, 41, 42 is inserted and fixed in each shaft hole 33, 34, 35. As means for fixing the arm support shafts 40, 41, 42 to the rotation frame 30, various means known in the related technical field can be used. It should be noted that 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 simple explanation of the drawing. Therefore, in the following description of the rotor unit 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 that case, it is understood that the same members as the arm support shaft 40 fixed to the shaft hole 33 and the members attached to the arm support shaft 40 are provided for the shaft holes 34 and 35, respectively. I want to. In addition, 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, and therefore, the generic term “swing roller portion” may be used for these.

  An example of the means for fixing the arm support shaft 40 to the rotation frame 30 is an arm that protrudes from one end side of the rotation frame 30 to the other end side of the rotation frame 30 through the shaft hole 33. A combination of a screw thread provided at the end of the support shaft 40 and a nut capable of engaging with the screw thread may be used, or the end of the arm support shaft 40 and the shaft hole 33 may be locked to each other. A locking means that can be used, for example, a thread groove, a key or a knock shaft or the like may be provided, or a means such as fixing one end of the arm support shaft 40 to the rotation frame 30 by welding or the like is adopted. can do. Alternatively, the arm support shaft 40 may be integrally formed with the rotation frame 30.

  The arm support shaft 40 is inserted through the base end side hole 51 of one roller support arm 50, the spacer 52, and the base end side hole 54 of the other roller support arm 53 without being fixed to each member. Therefore, the two roller support arms 50 and 53 can rotate or swing around the arm support shaft 40. The spacer 52 is a cylindrical member for defining the relative distance between the two roller support arms 50 and 53. The axial length of the spacer 52 is the tip of the roller support arm 50 described later. The length is set to be substantially the same as the axial length of the revolution roller 70 supported on the side. Alternatively, a protruding portion having the same size and shape as the spacer 52 may be integrally formed in 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, a retaining means for the two rotation frames 30 and 80 is provided at both ends of the arm support shaft 40. .. As such a retaining means, various means known in this technical field can be adopted. In the embodiment shown in FIG. 1, threads are formed on both ends of the arm support shaft 40, and nuts 43 and 44 corresponding to the threads on both ends are engaged with each other to serve as retaining means.

  In the embodiment shown in FIG. 1, the roller support arm 50 has a broad bean type planar shape, but has a function of supporting the revolution roller on the tip side and swinging with the arm support shaft as a pivot on the base side. The shape is not particularly limited as long as the shape can be achieved. Further, a tip side hole 56 is provided on the tip side of the roller support arm 50. The other roller support arm 53 located on the relatively right side in FIG. 1 cooperates with the roller support arm 50 located on the relatively left side so that the rotation shaft of the revolution roller 70 is evenly distributed from both sides, as described later. Since it is a member for supporting, it has substantially the same size and shape as the roller supporting arm 50. Therefore, also on the tip end side of the other roller support arm 53, a tip end side hole 57 is provided at a position corresponding to the tip end 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 supporting arms 50 and 53. The revolving roller 70 has a cylindrical shape as a whole, and a central through hole (not shown) is provided around the central axis of the revolving roller 70 so as to connect the central portions of the two bottom surfaces of the cylinder to each other.

  With the tip end side hole 56 of one roller support arm 50, the central through hole of the revolution roller 70, and the tip end side hole 57 of the other roller support arm 53 aligned, the roller support shaft 60 is placed therein. It has been inserted.

  Since the revolution roller 70 is not fixed to the roller support shaft 60, it can rotate around the roller support shaft 60. It should be noted that the both ends of the roller support shaft 60 are provided with retaining means for the two roller support arms 50 and 53. As such a retaining means, various means known in this technical field can be adopted. 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 the both ends are engaged with each other to serve as retaining means.

  In FIG. 1, the right end portion of the arm support shaft 40 is preferably inserted through a shaft hole 82 provided in the other rotation frame 80 located on the right side, and locked by a retaining means. Since the rotation frame 80 is a member for supporting the arm support shaft 40 evenly from both sides in cooperation with the rotation frame 30, it is formed in a disc shape having substantially the same size and shape as the rotation frame 30. ing. Therefore, the shaft holes 82, 83, 84 in the rotation frame 80 have substantially the same size, shape and arrangement as the shaft holes 33, 34, 35 in the rotation frame 30.

  The distal end portion of the pump shaft 20 may be inserted into a central hole 81 provided in the central portion of the rotation frame 80, and the distal end portion of the pump shaft 20 protruding from the rotation frame 80 may be locked by a retaining means. it can. As such a retaining means, various means known in this technical field can be adopted. In the embodiment shown in FIG. 1, a thread is formed at the tip of the pump shaft 20, and a lock nut 23 corresponding to the thread is engaged to form a retaining means.

  Further, in the mode shown in FIG. 1, in the vicinity of the central portion of the rotation frame 80, a part of the protruding portion 85 provided on the right side of the disk-shaped rotation frame 80 on the cylindrical side surface, A hole 86 having a female screw is provided on the inner surface thereof so as to pass through to the central hole 81. By rotating the set screw 24 having a male screw corresponding to the hole 86, the rotation frame 80 is rotated with respect to the pump shaft 20. It can be attached in a stopped state. As the means for attaching the rotation frame 80 to the pump shaft 20 in a detent state, various detent means known in the art can be adopted.

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

  Set holes 36 and 87 are provided at 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. Corresponding to the set holes 36 and 87, the two mounting holes 73 and 74 provided at the left and right ends of the base portion 72 of the elastic means 71 are aligned, and the mounting hole 73 on the left side of the elastic means 71 in the figure is aligned. And the setting hole 36 are locked by the screw 75, and the mounting hole 74 and the setting hole 87 on the right side of the elastic means 71 are locked by the screw 76, so that the elastic means 71 can rotate the two rotating frames 30 and 80. It has been fixed against.

  In this aspect, the elastic means 71 is formed by a plate-shaped member having spring elasticity. Two tongues 77 and 78 project downward from the base 72 of the elastic means 71 in the drawing. In a state where the elastic means 71 is fixed to the two rotation frames 30 and 80, one tongue piece 77 abuts the roller support arm 53 and pushes the roller support arm 53 toward the pump shaft 20 side, and the other one. The tongue-shaped piece 78 contacts the roller support arm 50 and pushes the roller support arm 50 toward the pump shaft 20. Therefore, in the rotor portion 10 in this state, the revolving roller 70 is pushed by the elastic means 71 to take the retracted posture in which it contacts the pump shaft 20. The elastic means 71 may be a member having elasticity such as rubber instead of the plate-like member having spring elasticity shown here.

  Next, a schematic configuration of the entire 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 arranged on the left side of the drawing, and a motor shaft 101 extends from the motor 100 toward the right side of the drawing, and the right end of the motor shaft 101 is connected to the pump shaft by a suitable coupling means 102. It is connected to the left end of 20. The rotor portion 10 of the roller type pump is attached to the right end portion of the pump shaft 20, and the stator portion 110 is arranged so as to surround the upper and lower sides of the rotor portion 10.

  Between the coupling means 102 and the rotor part 10, a sleeve 90 having a predetermined thickness and surrounding the pump shaft 20 and having a generally cylindrical shape is arranged. However, the sleeve 90 has a taper surface 89 formed in a taper shape that is tapered over a predetermined length near the outer right end. In the mode shown in FIG. 2A, the sleeve 90 is located between the rotor unit 10 and the motor 100, and a sliding mechanism for sliding the sleeve 90 in the longitudinal direction of the pump shaft 20 (left-right direction in the drawing). Is provided.

  FIG. 2B shows a cross-sectional view of the cross section taken along line IIB-IIB′ in FIG. 2A, which is observed in the direction of the arrow. In the mode shown in FIG. 2B, the slide mechanism includes a slide mechanism frame 91 that surrounds the outside of the sleeve 90 in a tubular shape as a whole and extends over substantially the entire length of the sleeve 90, and a part of the slide mechanism frame 91 is cut away in the longitudinal direction thereof. And a rack 93 provided on a part of the outer surface of the sleeve 90 and projecting from the outer surface of the slide mechanism frame 91 through the groove 92. It is formed by a rack and pinion mechanism including at least a pinion 94 provided so as to be engaged with the rack 93 and a motor 95 for controlling the pinion 94 to rotate in the forward direction or the reverse direction. For such a rack-and-pinion mechanism, means known in this technical field can be adopted. In addition to the rack-and-pinion mechanism, one tubular member (slide mechanism frame 91) accommodates one long member (sleeve 90), and one tubular member (slide mechanism frame 91) Various mechanisms that can change the relative positional relationship between the one tubular member and the one long member between the state where the one long member (sleeve 90) is projected are adopted. can do.

  Alternatively, the pump shaft 20 may be detachably provided in the combination of the rotor unit 10 and the stator unit 110 shown in FIG. 2A. In that case, in FIG. 2A, the rotor portion 10 is not fixed to the pump shaft 20 by using the lock nut 23 at the right end portion of the pump shaft 20, but the rotor is provided in the stator portion 110. The portion 10 is arranged, and when the pump is operated, the pump shaft 20 is moved from the left side to the right side of the drawing to be inserted into the central hole of the rotor portion 10 as shown in FIG. 2A, for example. be able to. In this case, the rotor portion 10 is in the retracted posture when the pump shaft 20 is not inserted, and the rotor portion 10 can be changed to the operating posture by inserting the pump shaft 20. Further, in this case, after inserting the pump shaft 20, by further inserting the sleeve 90 into the central hole of the rotor portion 10, the rotor portion 10 can be changed to the operating posture. By thus providing the pump shaft 20 so that it can be inserted into and removed from the combination of the rotor portion 10 and the stator portion 110, the structure of the operating portion of the roller type pump of the present invention is simplified and the maintainability such as cleaning is further improved. be able to.

  As a mechanism for advancing and retracting such a pump shaft, it is possible to use various mechanisms represented by a rack-and-pinion mechanism for converting rotational movement into linear movement. For example, a mechanism for moving the motor 100 and the pump shaft 20 communicating with the motor 100 forward and backward in the longitudinal direction of the pump shaft by an actuator, the motor 100 is stationary, and a flexible joint is provided between the motor 100 and the pump shaft 20. A mechanism that communicates with each other by a crank mechanism or the like can be exemplified.

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

  In the roller type pump according to the present invention having the above configuration, when the revolving roller 70 revolves in the retracted posture shown in FIGS. 3A and 3B, the circumferential locus drawn by the outer edge of the revolving roller 70 is C1. Let r1 be the revolution radius of the circumferential locus C1 from the axis of the pump shaft 20 (radius when the revolution roller 70 revolves), and from the axis of the pump shaft 20 to the wall surface 111 facing the revolution roller 70 of the stator part 110. If the outer diameter of the elastic tube that is arranged between the rotor portion 10 and the stator portion 110 and is not crushed is t1, and the distance is D1, then D1 is set to a dimension larger than the sum of r1 and t1. Has been done. That is, G1 (G1=D1-(r1+t1)), which is a dimension obtained by subtracting the sum of r1 and t1 from D1, is a positive value, and between the revolution roller 70 and the stator part 110 in the retracted posture, A space larger than the outer diameter t1 of the elastic tube by the gap G1 is formed.

  With respect to the roller type pump having such a configuration, the work of disposing the elastic tube between the revolution roller 70 and the stator portion 110, or the elastic tube that has already been disposed between the revolution roller 70 and the stator portion 110. The work of removing from the space is very easy because the space between the revolving roller 70 and the stator portion 110 is a space larger than the outer diameter t1 of the elastic tube in the uncrushed state by the size of the gap G1. Can be done. In particular, when disposing the elastic tube between the revolving roller 70 and the stator section 110, it is not necessary to push the elastic tube into the gap between the roller and the stator section while crushing the elastic tube with a finger or a jig. It can be prevented from being attached to the pump by twisting it or providing an unevenly extending portion.

  In the roller type pump of the present invention, since the space having the sum of the outer diameter t1 of the elastic tube in the uncrushed state and the gap G1 can be used for mounting the elastic tube, the revolution roller 70 and the stator portion 110 are not connected to each other. It is also possible to easily attach not only the elastic tube but also the elastic tube accommodated in another case member or the like between the elastic tube and the elastic tube. For example, by mounting a case member in which elastic tubes are arranged so as to meet a specific purpose to form a flow path or a circuit, to the roller pump of the present invention together with the case members, the elastic tube is rotated by the revolution roller 70 and the stator. It is also possible to install it between the unit 110 and the like.

  FIG. 4A is a view showing a state corresponding to FIG. 3A of the rotor portion 10 displaced to the operating posture, and FIG. 4B is a cross-sectional view of the cross section taken along the line IVB-IVB′ in FIG. 4A as observed in the arrow direction. ..

  In this operating posture, a sleeve 90 having a thickness SL is inserted from the left side of the drawing between the revolution roller 70 of the rotor portion 10 and the pump shaft 20 after the elastic tube is attached in the retracted posture as described above. Corresponds to the state. When the revolving roller 70 revolves in this operating posture, the circumferential locus drawn by the outer edge of the revolving roller 70 is C2, and the revolving radius of the circumferential locus C2 from the axis of the pump shaft 20 (the revolving roller 70 revolves). When the radius) is r2, the revolution radius r2 in the operating posture is larger than the revolution radius r1 in the retracted posture by the thickness SL of the sleeve 90. That is, there is a relationship of r2=r1+SL.

  Further, assuming that the thickness of the elastic tube crushed between the roller 70 and the stator portion 110 is t2, the shaft of the pump shaft 20 faces the revolution roller 70 of the stator portion 110 as in the case of FIG. If the distance to the wall surface 111 is D1, the relationship of D1=(r2+t2) is established between D1, r2, and t2.

  Such a change in dimension between the retracted posture and the operating posture 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 110 is the same between the retracted posture and the operating posture. When the revolving roller 70 revolves, the revolving radius of the circumferential locus drawn by the outer edge of the revolving roller 70 is r1 in the retracted posture, and is the dimension in which the sleeve thickness SL is added to the r1 in the working posture. Has become.

  Therefore, in the retracted posture in which the elastic tube is attached to the pump, as the space for inserting the elastic tube, the space of the sum of t1 and G1 can be secured, while the operation for operating the pump. In the posture, the space through which the elastic tube is inserted by inserting the sleeve 90 is only t2 which remains after subtracting the thickness SL of the sleeve from the size of the sum of t1 and G1. Since the size of t2 substantially corresponds to the thickness of the elastic tube in the crushed state, the pump of the present invention squeezes the elastic tube into a squeezed state like a general roller type pump in the operating posture. It can act and send liquid.

  FIG. 4A shows a state in which the sleeve 90 is inserted between the revolving roller 70 and the pump shaft 20 beyond the tapered surface 89 thereof to a portion having a substantially uniform radius. In the mold pump, the extent to which the sleeve 90 is inserted between the revolution roller 70 and the pump shaft 20 is such that the taper surface 89 of the sleeve 90 remains between the revolution roller 70 and the pump shaft 20, and thus the taper of the sleeve 90. The operation condition also includes operating in a state where a part of the surface 89 and the left end of the revolving roller 70 are in contact with each other. When the pump is operated in such a state that a part of the tapered surface 89 of the sleeve 90 and the left end of the revolving roller 70 are in contact with each other, the degree of compression of the tube can be adjusted.

  The extent to which the sleeve 90 is inserted into the revolving roller 70 in that case is based on the information sent from the flow meter provided in the elastic tube for liquid delivery at a location outside the roller pump of the present invention. Can be adjusted. For example, when the rotation speed of the pump shaft 20 is fixed due to a problem on the motor side, the range of speed adjustment is narrow, or the speed cannot be finely adjusted, by adjusting the degree of compression of the tube. , The flow rate of liquid can be adjusted. Alternatively, when the rotation speed on the motor side can be adjusted, the flow rate can be adjusted by adjusting the rotation speed of the motor or by combining the adjustment of the degree of compression of the tube and the adjustment of the rotation speed of the motor. ..

  Therefore, in the roller type pump in the operating position, the roller moves along the wall surface facing the revolution roller of the stator part while crushing the elastic tube between itself and the stator part, like a general roller type pump. Therefore, it is possible to perform an ironing action on the elastic tube. As a result, the roller 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 communicates with a tube of the same type or a different type as the elastic tube 120 by means of joint means 121, 122 or the like outside the rotor unit 10, and is used as an artificial dialysis device, a peritoneal dialysis device, a plasma exchange device, an immunoadsorption device. In a blood purification device such as a device, a heart-lung machine, or a fluid replacement device, it is possible to further communicate with a supply source and/or a delivery destination for fulfilling a predetermined purpose of delivering various corresponding liquids.

The revolution roller 70 may be made of various plastic rubber materials used in this technical field as a roller of a roller pump. On the other hand, as the material of the sleeve 90, when the sleeve 90 is inserted between the pump shaft 20 and the revolution roller 70, its thickness is maintained against the force of pressing the roller support arm toward the pump shaft. A material having an appropriate hardness and/or rigidity that has a relatively small surface friction coefficient as compared with a rubber material, such as polyethylene, polypropylene, polyacetal, a fluororesin, or the like, or It is preferable to use various metallic materials such as stainless steel, aluminum, aluminum alloys and various ceramic materials. This is because with respect to the function of the pump, it is preferable that the revolution roller 70 rotates without slipping between the revolution tube 70 and the elastic tube, while the revolution roller 70 substantially slips between the sleeve 90 or the pump shaft 20. This is because it is not a serious problem. Therefore, the sleeve 90 does not necessarily need to be formed as a single member as long as it can cause a proper slip between the revolution roller 70 and the pump shaft 20, and the inner layer and the outer layer, or more. It may be a multi-layered structure including the above layers, or a main body portion that does not contact the tip end portion that contacts the revolving roller 70.

[0004]
The swing roller portion is provided at each of the above positions and revolves around the pump shaft in accordance with the rotation of the rotor portion. The swing roller portion includes an arm support shaft; each arm support shaft. Roller support arms that are swingably supported around them; Roller support shafts that are inserted into the tip ends of the roller support arms; Revolution rollers that are rotatably supported around the roller support shafts; Elastic means for pressing the rotor part toward the pump shaft, and the stator part is arranged so as to surround at least a part of the rotor part on the outer side in the radial direction of the rotor part. The moving roller portion has a retracted posture in which the revolving roller is brought into contact with the pump shaft by being pushed by the elastic means; It is characterized by swinging between an operating posture in which the radius is larger than the revolution radius in the retracted posture. The rocking roller part changes the rocking roller part from the retracted position to the working position by inserting the pump shaft into the center hole of the rotor part or by inserting the sleeve between the pump shaft and the revolution roller. You can That is, the rotor part may have a form in which the pump shaft is inserted in the central part in advance, and the pump shaft is separated from the rotor part, and when the pump is operated, the pump shaft is inserted into the central hole of the rotor part. It can also be used by inserting it into the.
[0012] In the roller type pump of the present invention, each of the revolution rollers has a fan shape with a center angle of an angle obtained by equally dividing 360 degrees by the number of the revolution rollers around the axis of the pump shaft. The stator portions are provided at positions equidistant from the axis of the pump shaft on the radius serving as the boundary between the sectors, and the stator portion continuously surrounds at least two revolution rollers arranged on the rotor portion. It can be characterized in that it is provided in the range. Even when the revolution radius of the revolution roller changes, the angle between the two revolution rollers around the axis of the pump shaft is substantially maintained, and therefore the range surrounded by the stator part means the revolution roller. It is sufficient if the range is such that at least two revolution rollers are continuously surrounded when the revolution radius is maximum.
[0013]In the roller type pump of the present invention, the distance D1 from the shaft of the pump shaft to the wall surface of the stator portion facing the revolution roller is such that, in the retracted posture, when the revolution roller revolves, the outer edge portion of the revolution roller rotates. Revolution radius r1 from the pump shaft axis of the circular trajectory drawn by


Four

[0013]
A screw thread is formed at the tip of the push shaft 20, and a lock nut 23 corresponding to the screw thread is engaged to serve as retaining means.
In addition, in the embodiment shown in FIG. 1, in the vicinity of the central portion of the rotation frame 80, one is formed on the side surface of the cylindrical shape of the protruding portion 85 that is provided so as to project to the right side from the disk-shaped rotation frame 80. In the portion, a hole 86 that penetrates to the central hole 81 and has a female screw on the inner surface is provided, and by rotating the set screw 24 having a male screw corresponding to this hole 86, the rotation frame 80 is attached to the pump shaft 20. On the other hand, it can be installed in a non-rotating state. As the means for attaching the rotation frame 80 to the pump shaft 20 in a detent state, various detent means known in the art can be used.
[0048] As described above, in the embodiment shown in Figure 1, the two rotating frames 30 and 80 have a disk-like configuration having substantially the same radius, and the pump shaft 20 rotates about its axis. By doing so, 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 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. Corresponding to the set holes 36 and 87, the two mounting holes 73 and 74 provided at the left and right ends of the base portion 72 of the elastic means 71 are aligned, and the mounting hole 73 on the left side of the elastic means 71 in the drawing is aligned. And the set hole 36 are locked by the screw 75, and the mounting hole 74 and the cent hole 87 on the right side of the elastic means 71 are locked by the screw 76, so that the elastic means 71 can rotate the two rotating frames 30 and 80. It has been fixed against.
[0050] In this aspect, the elastic means 71 is formed by a plate-shaped member having spring elasticity. Two tongues 77 and 78 project downward from the base 72 of the elastic means 71 in the drawing. In a state where the elastic means 71 is fixed to the two rotation frames 30 and 80, one tongue piece 77 abuts the roller support arm 50 to push the roller support arm 50 toward the pump shaft 20 side, and the other one. The tongue-shaped piece 78 contacts the roller support arm 58 and pushes the roller support arm 53 toward the pump shaft 20. Therefore, in the rotor portion 10 in this state, the revolution roller 70 is pushed by the elastic means 71, so that the pump shaft 2


Thirteen

Claims (8)

A rotor portion that is connected to a motor and rotates about a rotating pump shaft; and a stator portion that surrounds the rotor portion, and an elastic tube for feeding liquid between the rotor portion and the stator portion A roller type pump in which
The rotor portion extends in a plane perpendicular to the axis of the pump shaft and extends radially outward of the pump shaft in a rotationally symmetrical shape around the pump shaft; and; on the rotation frame, around the pump shaft. Each of which is provided at two or more rotationally symmetric positions, and has a swing roller portion that revolves around the pump shaft as the rotor portion 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 at a tip end side of each of the roller support arms; A revolving roller rotatably supported around the elastic member; and elastic means for pressing the roller supporting arm toward the pump shaft,
The stator section is arranged so as to surround at least a part of the rotor section on the outer side in the radial direction of the rotor section,
The rocking roller portion has a retracted posture in which the revolving roller is brought into contact with the pump shaft by being pushed by the elastic means; The roller-type pump is characterized by swinging between an operating posture in which the orbiting radius is larger than the orbiting radius in the retracted posture.   The swing shaft part is changed from the retracted position to the working position by inserting the pump shaft into the central hole of the rotor part and/or inserting the sleeve between the pump shaft and the revolution roller. The roller type pump according to claim 1.   The revolution rollers are pumps on the radius which is the boundary between the respective fan shapes when a fan shape whose center angle is an angle obtained by equally dividing 360 degrees by the number of the revolution rollers is assumed around the axis of the pump shaft. The stator portion is provided at a position equidistant from the axis of the shaft, and the stator portion is provided in a range that continuously surrounds between at least two revolution rollers arranged on the rotor portion. The roller type pump according to claim 1.   The distance D1 from the axis of the pump shaft to the wall surface facing the revolution roller of the stator part is defined by the circumference of the pump shaft axis drawn by the outer edge of the revolution roller when the revolution roller revolves in the retracted posture. 6. The radius of revolution r1 of 1 and the outer diameter t1 of the elastic tube which is arranged between the rotor portion and the stator portion and is not crushed is set to be larger than the sum thereof. The roller type pump according to any one of 1 to 3.   When the revolution roller revolves in the operating posture, it is arranged between the revolution radius r2 from the axis of the pump shaft in the circumferential locus drawn by the outer edge of the revolution roller and the rotor portion and the stator portion. The roller type pump according to claim 4, wherein a sum of a thickness t2 of the elastic tube crushed between the revolution roller and the stator portion is set to be equal to the distance D1.   The roller type pump according to any one of claims 1 to 5, wherein the revolution radius r2 in the operating posture is adjusted according to the wall thickness of the elastic tube.   The revolution radius r2 from the axis of the pump shaft of the circumferential locus drawn by the outer edge of the revolution roller in the operating posture is adjusted based on information from a flow meter provided on the liquid feeding elastic tube. The roller type pump according to any one of 6 above. The roller type pump according to claim 7, wherein the rotational speed of the pump shaft is adjusted based on information from a flow meter provided on the liquid feeding elastic tube.

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