JP6425201B2 - Tube pump and fluid delivery method - Google Patents

Description

  The present invention relates to a tube pump for delivering fluid and a fluid delivery method.

Conventionally, a pressing unit such as a pressure roller for pressing a tube is provided on a rotating body (rotor) rotated by a driving unit such as a motor, and the rotating body is rotated to move the pressing unit to deliver fluid (transfer Tube pumps are known.
For example, in Patent Document 1, an adhesion state blocking member such as a linear member or a belt-like member for separating the inner surfaces of the closed portion of the tube generated by the pressing by the pressing member after removing the pressing force A tube pump in an inserted configuration is disclosed.
Further, Patent Document 2 below discloses a tube pump provided with a guide plate that rotates integrally with a pump drive shaft with a function of releasing the pressing state of the tube by the pressure roller when not in use. In this tube pump, a guide plate is provided with a long hole shaped guide hole for freely supporting the pressure roller in the tube pressing state and the pressure releasing state, and the pump drive shaft is reversely rotated when not in use. The pressure roller is moved along the guide hole to be in a pressure released state.

Japanese Patent Application Laid-Open No. 11-82324 Patent No. 3217518

  By the way, in the tube pump as described above, in order to make the discharge amount of fluid per delivery approximately constant, it is possible to obtain an angle obtained by dividing an angle of 360 degrees by the number of pressing parts by an integer multiple It is conceivable to rotate the rotating body for each delivery. In this case, it is conceivable that the pressing portion squeezes the same position of the tube at the stop position for each delivery and the tube is likely to be deteriorated. Also in the tube pump described in Patent Document 1 described above, although the recoverability of the tube is improved, it is considered that the same problem is likely to occur. Moreover, in the tube pump described in the said patent document 2, there existed a problem that the structure of the guide plate which moves a pressure roller becomes complexity. Moreover, in the tube pump described in these patent documents, the further improvement is desired also from a viewpoint of the sealing property (occlusion property) of the tube by a pressure member or a pressure roller.

  The present invention has been made in view of the above-mentioned circumstances, and although the structure can be simplified and the tube can be sealed, and a substantially constant amount of fluid can be delivered per delivery, the tube is degraded. It is an object of the present invention to provide a tube pump capable of suppressing the above and a fluid delivery method using such a tube pump.

In order to achieve the above object, the tube pump according to the present invention is a tube pump provided with a pressing portion on a rotating body rotated by a driving portion, and a tube for delivering a fluid on the outer peripheral side of the rotating body The angle obtained by dividing 360 degrees by the number of the pressing portions is set to a different position by a portion obtained by crushing the pressing portions in the tube before and after the delivery, with respect to an angle obtained by integer multiple of the angle obtained. The control unit is characterized in that the control unit is configured to rotate the rotating body at each delivery until a predetermined delivery angle obtained by adding or subtracting the predetermined angle.

Further, in order to achieve the above object, the fluid delivery method according to the present invention comprises a tube pump provided with a pressing portion on a rotating body rotated by a driving portion and provided with a tube for delivering fluid on the outer peripheral side of the rotating body. The fluid delivery method using A, wherein an area obtained by dividing 360.degree. By the number of the pressing portions is an integer multiple of an angle obtained by dividing the portion crushed by the pressing portions in the tube before and after delivery. so that position, and wherein the rotating the rotating member at a predetermined angle which is set in advance or to one for each delivery to a predetermined delivery angle minus the addition.

  The tube pump according to the present invention and the fluid delivery method using such a tube pump can simplify the structure and seal the tube by the above-mentioned configuration, and can be substantially constant for each delivery. While it is possible to deliver a volume of fluid, it is possible to suppress tube deterioration.

It is a partially omitted schematic plan view which shows typically an example of the tube pump concerning one embodiment of the present invention. (A) is a partially broken schematic plan view of the same tube pump, (b) is a schematic system configuration diagram schematically showing an example of a fluid delivery system incorporating the same tube pump. (A) is a partially omitted schematic plan view of the tube pump, (b) is a partially broken schematic exploded perspective view in which a portion of the tube pump is omitted. (A)-(d) are the partially broken schematic plan views which show typically an example of the procedure of the fluid delivery method which concerns on one Embodiment of this invention performed using the same tube pump. (A)-(d) are the partially broken schematic plan views which show typically an example of the procedure of the fluid delivery method which concerns on other embodiment of this invention performed using the same tube pump.

Hereinafter, embodiments of the present invention will be described based on the drawings.
In some of the drawings, some of the detailed reference numerals attached to the other drawings are omitted.
1 to 4 are diagrams schematically showing an example of a tube pump according to the present embodiment and an example of a fluid delivery method according to the present embodiment performed using the same.

The tube pump 1 which concerns on this embodiment is provided with the rotary body 20 in which the press part 23 was provided, and the tube 30 provided in the outer peripheral side of this rotary body 20 and sending out a fluid, as shown in FIG. ing. The rotating body 20 is rotated by the drive unit 26 (see FIG. 2B). Moreover, the tube pump 1 is provided with the pump main body 10 which accommodates these rotary body 20 and the tube 30. As shown in FIG.
The tube pump 1 is configured to send (transfer) the fluid in the tube 30 by rotating the rotating body 20 to the delivery side (positive rotation) and moving the pressing portion 23. In FIG. 1, FIG. 4 and FIG. 5, the clockwise rotation is the reverse rotation of the rotary body 20 (rotation to the opposite side), and the counterclockwise rotation is the positive rotation of the rotary body 20.

  In the present embodiment, as shown in FIG. 1 and FIG. 2A, the pump body 10 has the original side holding portion 15 for suppressing movement of the tube 30 along the delivery direction of the delivery source side portion 34, It is set as the structure which permits the movement to the delivery direction tip side of the delivery destination side part 35 of 30. FIG. With such a configuration, it is possible to suppress the deterioration of the tube 30 while suppressing the drop of the tube 30 from the pump main body 10. That is, even when the tube 30 moves along with the movement of the pressing unit 23 to the delivery side and the non-delivery side, the movement along the delivery direction of the delivery source side portion 34 of the tube 30 is suppressed by the source side holding unit 15 can do. Therefore, detachment of the tube 30 from the pump body 10 can be suppressed. Also, even when the tube 30 moves with the movement of the pressing portion 23 to the delivery side, as shown in FIG. 2A, the delivery destination side portion 35 of the tube 30 is moved to the delivery direction tip side It can be done. Thereby, it can prevent that the tube 30 is compressed and bent in the moving direction front side of the press part 23 which moves to a sending side, and degradation of the tube 30 can be suppressed.

  Further, in the present embodiment, a contact portion 35 a provided on the delivery destination side portion 35 of the tube 30 abuts on a drawing site of the delivery destination side portion 35 of the tube 30 in the pump main body 10 to the outside of the pump body 10, A stopper portion 17 is provided for suppressing the movement of the contact portion 35a to the delivery direction source side. With such a configuration, the delivery destination side portion 35 of the tube 30 is drawn into the pump main body 10 even when the rotating body 20 is reversely rotated and the pressing portion 23 moves to the non-delivery side. Can be deterred.

  Moreover, in this embodiment, the 1st flange part 35a and the 2nd flange part 35b which comprise a contact part are provided in the delivery direction at the delivery destination side site | part 35 of the tube 30 at intervals. Further, the stopper portions of the pump main body 10 are a pair of projections (stopper projections) 17 and 17 which project in directions opposite to each other from both inner side walls formed so as to sandwich the delivery destination side portion 35 of the tube 30. . Further, the dimension (protrusion width dimension) W2 along the delivery direction of these stopper projections 17 and 17 is the dimension (inter-flange dimension) W1 along the delivery direction between the first flange portion 35a and the second flange portion 35b. It is considered larger than. With such a configuration, the first flange portion 35a of the tube 30 can be received by the pair of stopper projections 17 and 17 of the pump body 10. Therefore, the inside of the pump body 10 of the delivery destination side portion 35 of the tube 30 can be It is possible to stably suppress pulling in. Further, since the projection width dimension W2 of the stopper projections 17 and 17 is larger than the inter-flange dimension W1, when assembling the tube 30, the pair of stopper projections 17 is erroneously inserted between the flange portions 35a and 35b. , 17 can be prevented from being inserted. That is, it is possible to prevent the movement of the delivery destination side portion 35 of the tube 30 to the delivery direction tip side from being obstructed.

  Further, in the present embodiment, the delivery source side portion 34 of the tube 30 is provided with the first flange portion 34 a and the second flange portion 34 b in the same manner as the delivery destination side portion 35. And the delivery destination side portion 35 is made of the same joint part. With such a configuration, the structure can be simplified. Further, in the present embodiment, the original holding portion of the pump main body 10 is a pair of holding protrusions 15 which project in directions opposite to each other from both inner side walls formed to sandwich the delivery source side portion 34 of the tube 30 It is assumed that it is 15. Further, the pair of holding projections 15, 15 are inserted between the flange portions 34a, 34b of the delivery source side portion 34 to suppress movement of the delivery source side portion 34 in the delivery direction. With such a configuration, the movement of the delivery source side portion 34 of the tube 30 in the delivery direction can be stably suppressed.

  Further, in the present embodiment, the rotating body 20 is provided with the plurality of pressing portions 23 at intervals in the rotational direction. Further, the pump body 10 is provided with an inner peripheral wall surface 13 along which the tube 30 can be placed in an arc shape whose center of rotation is the rotation center 21 or 21A of the rotating body 20 (see also FIG. 3). In the pump main body 10, a state in which all of the plurality of pressing portions 23, 23 press the tube 30 with the rotation of the rotary body 20, and one of the plurality of pressing portions 23, 23 is positioned at the break portion of the tube 30 The inner peripheral wall surface 13 is provided so as to be displaced. Further, if the radius R1, R2, R3 of the inner circumferential wall surface 13 is different in the circumferential direction so that the compression ratio of the tube 30 by the pressing portions 23, 23 becomes substantially constant over the entire circumferential direction of the inner circumferential wall surface 13. I'm sorry. With such a configuration, the compression ratio of the tube 30 by the pressing portions 23, 23 can be made uniform in the tube longitudinal direction. That is, in either the state where all of the plurality of pressing portions 23, 23 press the tube 30 or the state where one of the plurality of pressing portions 23, 23 is positioned at the break portion of the tube 30, the pressing portion 23, The compression ratio of the tube 30 by 23 can be made approximately constant. In other words, between the parts such as the shaft 21 (21A) serving as the rotation center of the rotating body 20 and the bearing 19 (12) of the pump main body 10, a gap or tolerance (dimension tolerance) for fitting A clearance (gap) in a direction along the radial direction of the rotating body is generated. A difference in diameter of the inner peripheral wall surface 13 may be used to absorb the deviation toward the break portion side in a state where one of the plurality of pressing portions 23, 23 resulting from such a clearance is positioned at the break portion of the tube 30. it can. As a result, it is possible to suppress the occurrence of a delivery failure or the like due to an overload or insufficient compression on the tube 30.

  Further, in the present embodiment, the rotating body 20 is configured such that the two pressing portions 23 and 23 are provided at equal intervals in the rotational direction. The inner peripheral wall surface 13 of the pump main body 10 has a configuration in which the tube 30 is arranged along a series of arcs larger than a semicircle, and the radius R1 of the opposing side portion 13a of the discontinuous portion of the tube 30 in the inner peripheral wall surface 13 Is smaller than the other portions 13b and 13c. That is, when one of the two pressing portions 23 and 23 is positioned at the break portion, the other pressing portion 23 is positioned at the opposing side portion 13 a of the break portion, and the other pressing portion 23 is The restoring force of the tube 30 acts on the rotating body 20, which causes the rotating body 20 to be offset to the break portion side. Even in such a case, the radius R1 of the opposing side portion 13a of the discontinuous portion is reduced, so that the compression ratio of the tube 30 at the portion 13a is suppressed to be smaller than those of the other portions 13b and 13c. can do. Thereby, equalization | homogenization in the tube longitudinal direction of the compression rate of the tube 30 by the press parts 23 and 23 can be achieved by simple structure.

  Further, in the present embodiment, the radius R2 is gradually made different along the circumferential direction so that the inner peripheral wall surface 13 has a series of concave curved surface shapes. With such a configuration, movement of the pressing portions 23 and 23 accompanying rotation of the rotating body 20 is smoother than in the case where a step or a bent corner portion is provided on the inner peripheral wall surface to make the radius different in the circumferential direction. Thus, it is possible to suppress deterioration, damage and the like of the tube 30.

Hereinafter, an example of a concrete composition of tube pump 1 concerning this embodiment is explained.
In the present embodiment, the tube pump 1 is configured such that the pump body 10 accommodates a single rotating body 20 and a single tube 30.
As shown in FIG. 3B, the pump main body 10 has a main body case 11 provided with a housing recess opened in one direction toward the axis (shaft portion 21) of the rotary body 20, and an opening of the main body case 11. And a lid 18 provided to cover the side.
The lid 18 is provided with a bearing 19 which is provided so as to protrude in one axial direction of the rotating body 20 and which receives the shaft 21 serving as the rotation center of the rotating body 20. The main body case 11 is provided with a shaft portion 12 which is provided so as to be recessed in the other axial direction of the rotating body 20 and is inserted into a bearing portion 21A which is a rotation center of the rotating body 20.

An inner peripheral wall surface 13 along which the tube 30 is bent in a curved state is provided to the main body case 11. The inner circumferential wall surface 13 may also be provided on the lid 18. That is, the inner peripheral wall surface 13 may be formed by the main body case 11 and the lid 18 joined in the axial direction of the rotating body 20.
In the illustrated example, the inner peripheral wall surface 13 has an arc shape with a central angle of about 220 degrees when viewed in the axial direction. The portion on the side facing the circumferential center portion of the inner peripheral wall surface 13 is the withdrawal side of the tube 30 to the outside of the pump main body 10 as shown in FIG. 1, and the break of the tube 30 not along the tube 30 It becomes a part.
In the present embodiment, as shown in FIG. 3A, the depth from the center (axial portion 21) of the back side wall surface 13a which is the opposite side portion of the inner peripheral wall surface 13 opposite to the broken portion of the tube 30 The side radius R1 is smaller than the radii R2 and R3 of the other portions 13b and 13c. The back side wall surface 13a has an arc shape whose center in the circumferential direction matches the center in the circumferential direction of the inner peripheral wall surface 13, and in the example shown in the drawing, the central angle is about 90 degrees. The rear side radius R1 of the rear side wall surface 13a has the same diameter throughout the circumferential direction of the rear side wall surface 13a.

Further, gradually increasing wall surfaces 13b and 13b are provided on both sides in the circumferential direction of the back side wall surface 13a such that the radii R2 and R2 gradually increase from the back side wall surface 13a toward the discontinuous portion of the tube 30. ing. That is, the gradually increasing wall surfaces 13b and 13b on both sides are formed such that the radiuses R2 and R2 from the center of the circle (shaft portion 21) gradually increase with distance from the circumferential center of the inner peripheral wall surface 13.
In the illustrated example, the gradually increasing wall surfaces 13b and 13b are provided from the both sides of the back side wall surface 13a to a portion where the central angle of the inner peripheral wall surface 13 is about 180 degrees. That is, in the illustrated example, the gradually increasing wall surfaces 13b and 13b each having an arc shape with a central angle of about 45 degrees are provided on both sides of the back side wall surface 13a. One of the plurality of pressing portions 23, 23 is a break of the tube 30 in a state in which any one of the pressing portions 23 is positioned to face the back side wall surface side portion of the gradually increasing wall surfaces 13 b, 13 b and the back side wall surface 13 a. It will be in the state located in the department. In this state, the rotating body 20 is likely to be biased toward the discontinuous portion due to the clearance or the like.

Further, on the opposite side wall surface side of the gradually increasing wall surfaces 13b and 13b on the both sides, lead-out side wall surfaces 13c and 13c which are portions on the drawing side of the tube 30 are provided so as to be continuous with each other.
Each of the lead side wall surfaces 13c, 13c has an arc shape with a central angle of about 20 degrees in the illustrated example. Also. The lead-out side radii R3, R3 as the radius from the circle center (shaft portion 21) of the lead-out side wall surfaces 13c, 13c are made the same in the entire circumferential direction of the lead-out side wall surfaces 13c, 13c. The state in which the pressing portions 23 and 23 are positioned so as to face the drawing side portions of the drawing side wall surfaces 13c and 13c and the gradually increasing wall surfaces 13b and 13b is a state in which all the plurality of pressing portions 23 and 23 press the tube 30; Become. In this state, since the restoring force of the tube 30 acts similarly on each of the pressing portions 23, 23, the radial offset of the rotating body 20 or the like hardly occurs.
Further, the lead-out side wall surfaces 13c and 13c on both sides, the gradually increasing wall surfaces 13b and 13b on the both sides, and the back side wall surface 13a have a series of concave curved surface shapes so that steps and bending portions are not formed on the wall surfaces adjacent to each other. There is.

The dimensional difference (difference in diameter) between the above-described pull-out side radii R3, R3 and the back side radius R1 is such that the compression ratio of the tube 30 by the pressing portions 23, 23 is substantially constant over the entire circumferential direction of the inner peripheral wall surface 13. It may be set as appropriate. In addition, the above-mentioned difference in diameter may be appropriately set according to the above-mentioned clearance along the radial direction between the bearing 19 (shaft 12) of the pump body 10 and the shaft 21 (bearing 21A) of the rotating body 20. You may That is, taking into account the offset of the rotating body 20 caused by the clearance and the like, the diameter difference in the radial direction between the inner peripheral wall surface 13 and the pressing portions 23 and 23 of the rotating body 20 is circumferential It may be set as appropriate so as to be substantially constant over the whole.
Further, the dimension along the circumferential direction of the back side wall surface 13 a described above may be a dimension generally corresponding to the dimension along the circumferential direction of the discontinuous portion of the tube 30. In other words, with the dimension along the circumferential direction of the back side wall surface 13 a, the pressing portion 23 of the plurality of pressing portions 23, 23 is positioned at the break portion of the tube 30 as the rotating body 20 rotates. It is good also as a size according to the size to which it moves in the range where the restorative force from it becomes difficult to act. Further, the degree of gradually changing the dimension and diameter along the circumferential direction of the gradually increasing wall surfaces 13b and 13b on both sides also takes into consideration the magnitude of the restoring force received from the tube 30 by the pressing portion 23 moving with the rotation of the rotating body 20. It may be set appropriately. Further, the dimensions along the circumferential direction of the lead-out side wall surfaces 13c, 13c on both sides are the positions where all of the plurality of pressing portions 23, 23 press the tube 30 with the rotation of the rotary body 20. In the same manner, the range from which the restoring force from the tube 30 acts may be dimensioned according to the dimension to be moved.

Further, the pump body 10 (body case 11) has the delivery source side portion 34 and the delivery destination side portion 35 of the tube 30 so as to penetrate the side portion opposite to the circumferential center portion of the inner peripheral wall surface 13. The insertion parts 14 and 16 by which each is inserted are provided. The insertion portions 14 and 16 are provided so as to be continuous with the back wall surface side of the lead-out side wall surfaces 13 c and 13 c of the inner peripheral wall surface 13 described above. The insertion portions 14 and 16 are divided by the inner side wall, the bottom wall, and the lid 18 formed in the main body case 11 so as to sandwich the delivery source side portion 34 and the delivery destination side portion 35 of the tube 30 respectively. There is.
The pair of holding projections 15 and 15 and the pair of stopper projections 17 and 17 described above are formed to narrow the dimension between the inner side walls of the insertion portions 14 and 16. The holding projection 15 and the stopper projection 17 may be provided on the bottom wall of the body case 11 or the lid 18 in addition to or in place of the inner side walls of the insertion portions 14 and 16 of the body case 11. Good. That is, the bottom wall of the main body case 11 and the lid 18 may be grasped as both inner side walls of the drawing portion of the tube 30 in the pump main body 10.

The pair of holding projections 15 and 15 provided on the delivery source side insertion portion 14 are provided on the outer opening edge of the delivery source side insertion portion 14. The dimension (protrusion width dimension) along the delivery direction (tube longitudinal direction) of these holding projections 15, 15 is the first flange portion 34a and the second flange of the delivery source side joint 34 as the delivery source side portion of the tube 30. It is smaller than the dimension (inter-flange dimension) along the delivery direction with the portion 34 b. The protrusion width dimensions of the holding protrusions 15 may be set as appropriate so that the holding protrusions 15 can be inserted between the flange portions 34 a and 34 b of the transmission source side joint 34. Further, the projecting dimensions of the holding projections 15, 15, that is, the dimension between the tip surfaces of the holding projections 15, 15 in the projecting direction, are between the flange portions 34a, 34b of the transmission source side joint 34 between them. The dimensions may be set appropriately to allow insertion of the site. Further, the dimension between the tip end surfaces of the holding projections 15, 15 in the protruding direction may be smaller than the outer diameter of each flange portion 34a, 34b of the transmission source side joint 34.
These holding projections 15, 15 are inserted between the flange portions 34a, 34b of the delivery source side joint 34 of the tube 30, and the movement of the delivery source side joint 34 in the delivery direction is suppressed (see FIG. 1).

  The pair of stopper projections 17 and 17 provided in the insertion portion 16 on the delivery destination side are provided so as to be located inside the outer opening edge of the insertion portion 16 on the delivery destination side. These stopper projections 17, 17 are closer to the outer opening edge side of the insertion portion 16 than the stopper projections 17, 17, and at least the first flange portion 35 a of the transmission destination side joint 35 as the transmission destination side portion of the tube 30. It may be provided to be able to receive In the illustrated example, the delivery held by the delivery-side joint 35 and the pair of holding projections 15, 15 in a state where the first flange portion 35 a of the delivery-side joint 35 is in contact with these stopper projections 17, 17. It is set as the structure used as the position which the source | sauce side joint 34 and the substantially corresponded in the sending direction (refer FIG. 1).

Further, the projection width dimension W2 of the stopper projections 17 and 17 is appropriately set so that the stopper projections 17 and 17 can not be inserted between the flange portions 35a and 35b of the transmission destination side joint 35. Just do it. Further, the projecting dimensions of the stopper projections 17 and 17, that is, the dimensions between the tip surfaces of the stopper projections 17 and 17 in the projecting direction are the insertion of the tube 30 to which the delivery-side joint 35 is connected between them. The dimensions should be appropriate so that Further, the dimension between the tip end surfaces of the stopper projections 17 in the projection direction may be smaller than the outer diameter of the first flange portion 35 a of the delivery destination side joint 35.
When the delivery source side portion of the tube 30 is inserted between the stopper projections 17 and 17 with respect to the delivery destination side joint 35 of the tube 30, the delivery destination side joint 35 of the tube 30 can be moved to the delivery direction tip side It will be in a state (refer FIG. 2 (a)). On the other hand, the movement of the tube 30 to the delivery destination side of the delivery destination side joint 35 is restrained by the first flange portion 35a of the delivery destination side joint 35 contacting the stopper projections 17 and 17 (see FIG. 1) .

The rotating body 20 is configured such that a plurality of pressing portions 23 and 23 are provided on the outer peripheral side of the shaft portion 21 which is the rotation center thereof so as to be equidistant from the shaft portion 21. That is, these pressing portions 23 and 23 are provided on the rotating body 20 so as to be located on the same circumference with the shaft portion 21 as a circle when viewed in the axial direction. Further, the pressing portions 23 are provided at equal intervals in the rotational direction around the shaft portion 21 of the rotating body 20.
In the present embodiment, as described above, the two pressing portions 23 and 23 are provided around the shaft portion 21 of the rotating body 20. In other words, the two pressing portions 23 and 23 are provided on the rotating body 20 so that the distance between them in the rotational direction is 180 degrees. In the illustrated example, the pressing portions 23 are provided at the tip of a portion provided in an arm shape (spoke shape) so as to project from the shaft portion 21 in the radial direction.

Further, in the present embodiment, the pressing portions 23 are pressure rollers that are rotatable around the roller shafts 22 parallel to the shaft portion 21 of the rotating body 20. In Drawing 3 (b), illustration of a pressure roller inserted in roller axis 22 and 22 is omitted.
As shown in FIG. 1, the pressing portions 23 and 23 are disposed to face the inner peripheral wall surface 13 of the pump main body 10, and the tube 30 is crushed by the inner peripheral wall surface 13. At the stop position (initial position) of the rotating body 20 shown in FIG. 1, the pressed portion 31 of the tube 30 is formed by the pressing portion 23 of one of the two pressing portions 23 and 23 and the circumferential center portion of the inner peripheral wall surface 13. The squeezed state is illustrated. As described above, when the rotating body 20 is stopped and the tube 30 is squeezed, the pressed portion 31 of the tube 30 is closed, and the fluid can not be delivered (delivery stop). The stop position (initial position) of the rotating body 20 is an example, and may be another position.
Further, in the present embodiment, in the rotating body 20, the state in which the pressing portion 23 of one of the two pressing portions 23, 23 squeezes the tube 30 in this manner and the both pressing portions 23 and 23 A state in which the tube 30 is crushed is displaced.

Further, in the present embodiment, the tube guides 24, 24 for suppressing the positional deviation of the tube 30 are provided between the pressing portions 23, 23 of the rotating body 20 respectively. With such a configuration, it is possible to prevent the tube 30 from moving away from the inner circumferential wall surface 13 or being bent as the pressing portions 23 move.
In the illustrated example, the tube guides 24 are provided so as to radially project from the shaft portion 21 of the rotating body 20 and to be equidistant from the adjacent pressing portions 23. The tube guides 24, 24 are shaped so as to sandwich the tube 30 from both sides in the axial direction of the rotary body so as to suppress the movement of the tube 30 in the rotary body axial direction, and a recess for receiving the tube 30 is formed. It has a shape that is open in the radial direction so as to be The bottom 25 of the tube guides 24 in the opening direction is disposed to face the inner peripheral wall surface 13 so as to suppress the movement of the tube 30 toward the rotary shaft. The tube guides 24 may not be provided.

The tube 30 has a circular cross section, and as shown in FIG. 1, the pump main body 10 (along the above-mentioned inner circumferential wall surface 13 so as to be substantially U-shaped as viewed in the rotor axial direction). It is accommodated in the main body case 11).
The tube 30 is made of an elastic material having elasticity such that the portions crushed by the pressing portions 23, 23 can be restored, for example, EPDM, silicone, synthetic resin elastomer such as neoprene, natural rubber, etc. It is good also as things. As a material of such a tube 30, an appropriate one may be adopted according to the type of fluid to be delivered and the like. Further, the inner diameter of the tube 30, the length along the inner circumferential wall surface 13 and the like may be appropriately set according to the desired flow rate and the like of the fluid to be delivered. The fluid delivered by the tube pump 1 may be various liquids, may be in the form of emulsion (latex), in the form of slurry, or may be in the form of gas.

Further, the delivery source side joint 34 connected to the delivery source side end 32 of the tube main body of the tube 30 and the delivery destination side joint 35 connected to the delivery destination side end 33 of the tube main body have the same configuration. It is done.
The delivery source side joint 34 and the delivery destination side joint 35 are respectively provided with first connection portions that are press-fit into the delivery source side end 32 and the delivery side end 33 of the tube main body. Further, the first flange portions 34 a and 35 a described above are provided adjacent to the first connection portions of the delivery source side joint 34 and the delivery side joint 35.
Moreover, 2nd connection part 34c, 35c is provided in these sending origin side coupling 34 and the sending destination side coupling 35, respectively.

As shown in FIG. 1 and FIG. 2 (b), the second connection portion 34 c of the delivery source side joint 34 of the tube 30 is a delivery source side pipeline 3 connected to the reservoir 2 which is a delivery source of fluid. May be connected. Further, the delivery destination side pipeline 4 for delivering fluid to the delivery destination 5 of the fluid may be connected to the second connection portion 35 c of the delivery destination side joint 35 of the tube 30. In addition, a check valve, an on-off valve, etc. for preventing a backflow to the side of the source 2 of the fluid may be appropriately provided on the source side (upstream side) of the source side joint 34 of the tube 30 as needed. You may
The delivery source side portion and the delivery destination side portion of the tube 30 are not limited to the delivery source side joint 34 and the delivery destination side joint 35. For example, in the case where the tube 30 is elongated in series so that the tube 30 also extends out of the pump main body 10, the portion may be inserted into the insertion portions 14 and 16 of the pump main body 10. In this case, a holding portion held by the original holding portion 15 or an abutting portion abutted against the stopper portion 17 may be appropriately provided at the portion inserted through the insertion portions 14 and 16. .

The driving unit 26 that rotates the rotating body 20 is configured to be able to rotate the rotating body 20 forward and backward around the shaft 21. As such a drive unit 26, a so-called gear motor or the like provided with gear mechanisms such as various reduction gears connected to the shaft unit 21 may be adopted. In the present embodiment, as described later, since it is necessary to stop the rotating body 20 at an appropriate rotational position (rotational angle), the drive unit 26 can be controlled by a motor with a brake capable of controlling the rotational position, or servo It may be a motor or the like. Also, as appropriate, a detector such as a rotation angle sensor that detects the rotation position of the rotating body 20 may be provided. Further, in the present embodiment, a motor with an encoder and a stepping motor capable of detecting the rotation angle and the number of rotations of the rotating body 20 are used.
The drive unit 26 is connected to a control panel 40 provided with a control unit 41, as shown in FIG. 2 (b). The drive of the drive unit 26 is controlled by the control unit 41 to rotate the rotating body 20, and the fluid is discharged (discharged) or the like as described later.

The control unit 41 is configured of, for example, a control circuit such as a CPU. Under the control of the control unit 41, the fluid delivery method according to each embodiment described later is performed.
The control panel 40 includes, in addition to the control unit 41, a storage unit 42 configured by a memory and the like to store various operation programs and the like, a power supply unit 43 for supplying drive power to the drive unit 26, reception and display of operation input The display operation part 44 etc. which perform are suitably provided. Further, the control panel 40 may be provided in the tube pump 1 itself, or may be provided in various devices or systems (fluid delivery systems) in which the tube pump 1 is incorporated.

In the tube pump 1 configured as described above, when the rotating body 20 is rotated forward from the stop position, the fluid is self-primed and delivered with the movement of the pressing portions 23, 23. That is, when the pressing portion 23 moves to the delivery side, the pressed portion 31 of the tube 30 which has been crushed is restored. By the negative pressure action accompanying the restoration of the pressed portion 31, the fluid from the source 2 (source side conduit 3) side flows into the upstream portion of the tube 30. Also, the pressing unit 23 moves toward the delivery side while squeezing the tube 30 sequentially, and while sucking the fluid on the upstream side (the moving direction to the delivery side of the pressing unit 23), the downstream side (delivery of the pressing unit 23) The fluid in the tube 30 in the moving direction to the side (forward side) is delivered toward the delivery destination 5 (delivery destination side conduit 4) side.
Also, when the rotating body 20 is stopped at an appropriate rotational position, the delivery of fluid is stopped as described above.

Next, an example of a fluid delivery method according to the present embodiment performed using the tube pump according to the present embodiment will be described with reference to the drawings.
FIG. 4 is a view schematically showing a fluid delivery method according to the first embodiment.
In this fluid delivery method, the position 31 of the tube 30 which is crushed by the pressing part 23 before and after delivery is different from an angle obtained by dividing an angle obtained by dividing 360 degrees by the number of the pressing parts 23 and an integer. The rotating body 20 is rotated at each delivery until a predetermined delivery angle is obtained by adding or subtracting a predetermined angle. With such a configuration, the structure can be simplified and the tube 30 can be sealed, and the deterioration of the tube 30 can be suppressed while a substantially constant amount of fluid can be delivered per delivery. it can. That is, since rotation of the rotary body 20 is performed until the predetermined delivery angle is achieved for each delivery, a substantially constant amount of fluid can be delivered for each delivery. Moreover, since the site | part 31 crushed by the press part 23 in the tube 30 before and after sending becomes a different position, deterioration of the tube 30 can be suppressed compared with what squeezes the same position repeatedly before and after sending. . Further, for example, the structure can be simplified as compared with a guide plate provided with a guide hole for guiding the pressure roller. In addition, since the tube 30 can be crushed by the pressing portion 23 when the rotating body 20 is stopped, sealing performance can be improved, dripping of fluid at the time of stopping can also be suppressed, and delivery of fluid can be performed. It can be stopped stably.

  Further, in the present embodiment, the above-mentioned predetermined angle is an angle obtained by multiplying the predetermined angle by an integral multiple of 360 degrees. For example, when the angle obtained by multiplying the predetermined angle by an integer multiple is 360 degrees, it is conceivable that the rate at which the pressing unit 23 stops at the same position again increases as the number of times of delivery elapses. If it is set as the said structure, compared with such an aspect, the ratio in which the press part 23 stops in the same position can be decreased.

  In this embodiment, since the two pressing parts 23 and 23 are provided on the rotating body 20, an angle obtained by dividing 360 degrees by the number of the pressing parts 23 and 23 is an integer multiple of the angle obtained is n at 180 degrees. The angle is a multiple (n is an integer of 1 or more), and in this embodiment, this angle is 180 degrees. Moreover, in this embodiment, as shown to FIG. 4 (a)-(d), the said predetermined | prescribed delivery angle is made into the angle which added the predetermined angle to 180 degree.

  That is, as shown in FIG. 4A, a predetermined state is obtained from a state where the pressed portion 31 of the tube 30 is crushed by one pressing portion 23 and the circumferential center portion of the inner peripheral wall surface 13 (see also FIG. 1). The rotating body 20 is rotated to the delivery side until the delivery angle is reached. As a result, as shown in FIG. 4B, the rotating body 20 moves forward in the direction of movement toward the delivery side before the rotation of the rotating body 20 in the tube 30, that is, at the stop position before delivery. The stop position is such that the different portion 31B on the side is crushed. Likewise, as shown in FIGS. 4 (c) and 4 (d), if the rotor 20 is rotated to the delivery side until it reaches a predetermined delivery angle for each delivery, the rotor 20 is pushed at the stop position before delivery. The stop position is such as to squeeze different portions 31C, 31C (31D, 31D) on the forward side in the moving direction toward the delivery side from the portion 31B (31C, 31C) that has been crushed.

The determination as to whether or not the rotating body 20 has been rotated to the delivery side until it reaches a predetermined delivery angle may be determined by the control unit 41. For example, a rotation angle for detecting the rotational position of the rotating body 20 It may be determined by the control unit 41 receiving a signal from a detector such as a sensor or the drive unit 26.
In addition, each time delivery is turned on, one delivery operation, that is, the rotation body 20 may be rotated to a predetermined delivery angle. The determination of the transmission ON may be made, for example, by the control unit 41 receiving the transmission ON signal. In addition, the transmission ON signal may be output based on the operation input in the display operation unit 44 or the like, based on the transmission start signal (request signal) from the transmission destination 5 side, or the tube pump 1 is incorporated. It may be based on other operation signals executed in various devices or systems.

  In addition, the predetermined angle may be appropriately set so that the portion 31 of the tube 30 which is crushed by the pressing portion 23 before and after the delivery is at a different position. Such a predetermined angle may be appropriately set in accordance with the thickness (thickness) of the tube 30, the diameter of the pressure roller forming the pressure portion 23, and the like. In the present embodiment, the predetermined angle is an angle such that the pressing portion 23 moves in a dimension substantially corresponding to the dimension along the moving direction of the pressing portion 23. That is, an angle obtained by adding the above-mentioned predetermined delivery angle to the delivery side by 180 degrees and moving the dimension substantially corresponding to the dimension along the moving direction of at least the pressing part 23 to the delivery side And With such a configuration, the portions 31, 31B squeezed by the pressing portion 23 before and after the delivery approach each other, and the stop position of the rotating body 20 before and after the delivery can be realized by the minimum stop position deviation. it can. The illustrated example shows an example in which the predetermined angle is about 35 degrees, that is, the predetermined delivery angle is about 215 degrees. Further, the predetermined angle may be an angle such that at least the pressing portion 23 moves a dimension substantially corresponding to the dimension along the moving direction of the pressing portion 23, and 360 degrees may be the number of the pressing portions 23, 23. It may be less than the angle obtained by dividing. For example, the predetermined angle may be equal to or less than a half of the angle obtained by dividing 360 degrees by the number of the pressing portions 23, 23. Preferably, the predetermined angle may be equal to or less than 1/3.

Next, an example of a fluid delivery method according to another embodiment of the present invention performed using the above-described tube pump will be described with reference to the drawings.
FIG. 5 is a view schematically showing a fluid delivery method according to the second embodiment.
The description of the same configuration as that of the fluid delivery method according to the first embodiment will be omitted or simplified.

In the present embodiment, as shown in FIGS. 5A to 5D, the predetermined delivery angle is an angle obtained by subtracting the predetermined angle from 180 degrees. In the illustrated example, the predetermined angle is approximately 35 degrees as described above, that is, the predetermined delivery angle is approximately 145 degrees. However, various angles may be used as described above.
Also in the present embodiment, as shown in FIG. 5A, the pressed portion 31 of the tube 30 is crushed by one pressing portion 23 and the circumferentially central portion of the inner peripheral wall surface 13 (see also FIG. 1). ) Until the predetermined delivery angle is reached. Thereby, as shown in FIG. 5 (b), the rotating body 20 moves backward in the moving direction toward the delivery side from the portion 31 which is crushed at the stop position before the rotation of the rotating body 20 in the tube 30. The stop position is such that the different portion 31E on the side is crushed. Likewise, as shown in FIGS. 5 (c) and 5 (d), if the rotor 20 is rotated to the delivery side until it reaches a predetermined delivery angle for each delivery, the rotor 20 is pushed at the stop position before delivery. The stop position is such that the different portions 31F and 31F (31G and 31G) on the rear side in the moving direction toward the delivery side than the portion 31E (31F and 31F) that has been crushed are crushed.

The tube pump 1 is not limited to the above-described example. For example, the rotating body 20 may be provided with three or more pressing portions 23. Further, the pump main body 10 is not limited to one having a structure that allows movement of the delivery destination side portion 35 of the tube 30 to the delivery side destination side, and along the delivery direction of the delivery destination side portion 35 as in the delivery source side. It is good also as composition provided with the tip side holding part which deters movement. Further, the inner peripheral wall surface 13 of the pump main body 10 is not limited to the one having the different diameter in the circumferential direction as described above, but may have the same diameter over the entire circumference. In addition, a plurality of tubes are provided so as to equally divide the outer peripheral side of the rotating body 20 in the rotational direction, or a plurality of rotating bodies are provided in parallel in the axial direction, It may be configured to be provided with one or more tubes. Besides, the tube pump 1 may have various configurations.
Further, the fluid delivery method according to each of the above-described embodiments can also be performed using another tube pump other than the above-described tube pump 1.

Reference Signs List 1 tube pump 20 rotating body 23 pressing unit 26 driving unit 30 tube 41 control unit

Claims (4)

A tube pump provided with a pressing portion on a rotating body rotated by a driving portion, and a tube for delivering fluid to the outer peripheral side of the rotating body, the tube pump comprising:
An angle obtained by dividing an angle obtained by dividing 360 degrees by the number of the pressing parts by an integer multiple is set in advance so that the portion of the tube crushed by the pressing parts before and after the delivery becomes different positions . A tube pump comprising: a control unit which rotates the rotating body for each delivery until a predetermined delivery angle obtained by adding or subtracting a predetermined angle. In claim 1,
The tube pump according to claim 1, wherein the predetermined angle is an angle obtained by multiplying the predetermined angle by an integral multiple of 360 degrees. A fluid delivery method using a tube pump provided with a pressing part on a rotating body rotated by a driving part and provided with a tube for delivering fluid on the outer peripheral side of the rotating body,
An angle obtained by dividing an angle obtained by dividing 360 degrees by the number of the pressing parts by an integer multiple is set in advance so that the portion of the tube crushed by the pressing parts before and after the delivery becomes different positions . A fluid delivery method comprising: rotating the rotating body for each delivery until a predetermined delivery angle obtained by adding or subtracting a predetermined angle. In claim 3,
The fluid delivery method according to claim 1, wherein the predetermined angle is an angle that is an integral multiple of the predetermined angle and does not become 360 degrees.

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