JP7091788B2 - Tube pump - Google Patents

Description

The present invention relates to a pump assembly, particularly to a tube pump that conveys fluid through a tube.

As a fluid pump, there is a pump called a positive displacement pump that transports a fluid by pressing a surface forming a fluid flow path and deforming the flow path to cause a volume change of the flow path. As the pressing mechanism, a finger type, a roller type and the like are known. Patent Documents 1 and 2 disclose a roller-type pressing mechanism. In these pressing mechanisms, a plurality of rollers having the same shape are arranged around the central axis, and these rollers are driven by a motor to rotate around the central axis to pump the fluid.

Special Table 2016-520756 US Pat. No. 6,296,460

The rollers disclosed in Patent Documents 1 and 2 have a conical trapezoidal shape, and are installed so that the upper surface having a small diameter faces inward in the radial direction and the bottom surface having a large diameter faces outward in the radial direction with respect to the central axis. To. In such a configuration, since the center of gravity of the roller is moved away from the central axis, the moment of inertia (inertia) of the roller becomes large, and the driving energy for rotating the roller increases.

An object of the present invention is to provide a tube pump having a small driving energy.

The tube pump according to the first aspect of the present invention includes a flexible tube for transporting a fluid, a holder portion for holding the tube so that the tube is at least partially curved, a drive portion, and the like. The drive unit is rotationally driven around the first central axis, and while rotating around the first central axis, the tube is pressed along a curved portion of the tube held by the holder portion. It is provided with at least one pressing portion that conveys the fluid in the tube. The pressing portion has an inclined surface that is inclined from the tube side to the pressing portion side as it goes outward in the radial direction with respect to the first central axis on the surface of the pressing portion facing the tube.

The tube pump according to the second aspect of the present invention is the tube pump according to the first aspect, and the pressing portion is in the form of a roller rotatable around a second central axis intersecting the first central axis. ..

The tube pump according to the third aspect of the present invention is the tube pump according to the second aspect, and the pressing portion rotates around the second central axis in accordance with the rotation around the first central axis. ..

The tube pump according to the fourth aspect of the present invention is the tube pump according to the second aspect or the third aspect, the pressing portion is substantially in the shape of a conical base, and the conical base is the second central axis. A bottom surface that is substantially orthogonal to the second central axis, a top surface that is substantially orthogonal to the second central axis, has a smaller area than the bottom surface, and is radially outside the bottom surface with respect to the first central axis, and the bottom surface and the bottom surface. It has a peripheral surface extending between the upper surfaces, and the inclined surface is included in a portion corresponding to the peripheral surface in the pressing portion.

The tube pump according to the fifth aspect of the present invention is the tube pump according to any one of the first aspect to the fourth aspect, and the holder portion has a tube space in which the tube is housed. The tube space includes a first wall surface facing the pressing portion and a second wall surface that stands up from the first wall surface and abuts on the curved portion of the tube from the outside in the radial direction with respect to the first central axis. Specified in.

The tube pump according to the sixth aspect of the present invention is the tube pump according to the fifth aspect, and the height of the second wall surface from the deepest part of the tube space in the direction of the first central axis is h. When the radius of the cross section of the tube is r, h ≧ r.

The tube pump according to the seventh aspect of the present invention is the tube pump according to the fifth or sixth aspect, and the first wall surface is such that the tube toward the outside in the radial direction with respect to the first central axis. It has an inclined portion that is inclined from the side to the pressing portion side.

The tube pump according to the eighth aspect of the present invention is the tube pump according to the seventh aspect, and the first wall surface is continuous with the inclined portion and is substantially orthogonal to the first central axis, and the inclined portion is provided. It further has a horizontal portion arranged radially outside with respect to the first central axis, and the second wall surface stands up from the horizontal portion.

The tube pump according to the ninth aspect of the present invention is a tube pump according to any one of the fifth to eighth aspects, and the tube space stands up from the first wall surface and faces the second wall surface. Further defined by a third wall surface arranged radially inside with respect to the first central axis with respect to the second wall surface, one of the third wall surface and the second wall surface is predetermined from the first wall surface. Includes a claw portion that projects from a spaced height position toward the other of the third wall surface and the second wall surface to prevent the tube from falling out of the tube space.

The tube pump according to the tenth aspect of the present invention is a tube pump according to any one of the first to ninth aspects, further including a main body case for accommodating the driving portion and the pressing portion, and the holder portion. It is configured to be separable from the main body case.

The tube pump according to the eleventh aspect of the present invention is the tube pump according to the tenth aspect, and one of the holder portion and the main body case has an engaging portion, and the holder portion and the main body case have an engaging portion. The other has an engaged portion that is engaged with the engaging portion, and when the engaged portion and the engaged portion are engaged, the holder portion is positioned with respect to the main body case. It is configured to be.

The tube pump according to the twelfth aspect of the present invention is the tube pump according to the tenth aspect or the eleventh aspect, and one of the holder portion and the main body case has a magnet on a surface facing the other. The other of the holder portion and the main body case has a magnetic material or a magnet that faces the magnet and is magnetically attracted to the magnet.

The tube pump according to the thirteenth aspect of the present invention is the tube pump according to any one of the first aspect to the twelfth aspect, and further includes an urging member for urging the pressing portion toward the holder portion.

The pump assembly according to the fourteenth aspect of the present invention is rotationally driven around a first central axis by a flow path member having flexibility that defines a fluid flow path, a drive portion, and the drive portion, and the first. It is provided with at least one pressing portion that conveys the fluid in the flow path by pressing the flow path member while rotating around the central axis. The pressing portion has an inclined surface that is inclined from the flow path member side toward the pressing portion side in the first central axis direction toward the outer side in the radial direction with respect to the first central axis.

According to a first aspect to a thirteenth aspect of the present invention, a flexible tube for carrying a fluid is held in a holder portion so as to be at least partially curved. The curved portion of this tube is pressed by a pressing portion that is rotationally driven around the first central axis by the driving portion. This pressing portion has an inclined surface that is inclined from the tube side to the pressing portion side as it goes outward in the radial direction with respect to the first central axis on the surface of the pressing portion facing the tube. Therefore, the presence of this inclined surface reduces the weight of the pressing portion on the outer side in the radial direction with respect to the first central axis, and prevents the center of gravity of the pressing portion from moving away from the first central axis. Therefore, a tube pump having a small driving energy is provided.

Further, according to the 14th aspect of the present invention, the flexible flow path member that defines the flow path of the fluid is pressed by the pressing portion that is rotationally driven around the first central axis by the driving portion. This pressing portion has an inclined surface that is inclined from the flow path member side to the pressing portion side so as to go outward in the radial direction with respect to the first central axis on the surface of the pressing portion facing the flow path member. Therefore, the presence of this inclined surface reduces the weight of the pressing portion on the outer side in the radial direction with respect to the first central axis, and prevents the center of gravity of the pressing portion from moving away from the first central axis. Therefore, a pump assembly with low drive energy is provided.

The schematic perspective view of the tube pump which concerns on one Embodiment of this invention. The schematic perspective view of the holder part of the tube pump which concerns on one Embodiment of this invention. The bottom view which shows the pressing part (roller) and the holder part of the tube pump which concerns on one Embodiment of this invention. A side sectional view showing a structure around a pressing portion and a holder portion of a tube pump according to an embodiment of the present invention. The schematic perspective view of the holder part of the tube pump which concerns on one Embodiment of this invention as seen from the end face direction. The schematic perspective view which shows the detail around the claw part of the holder part of the tube pump which concerns on one Embodiment of this invention. The perspective view which shows the structure of the tube pump which concerns on the modification. Schematic perspective view of the holder portion of the tube pump according to the modified example. A side sectional view showing a structure around a pressing portion and a holder portion of a tube pump according to a modified example. A side sectional view of a holder portion of a tube pump according to a modified example. A side sectional view of a holder portion of a tube pump according to another modification.

Hereinafter, the tube pump according to the embodiment of the present invention will be described with reference to the drawings.

<1. Tube pump configuration>
FIG. 1 shows a schematic perspective view of a tube pump 1 (hereinafter, may be simply referred to as a pump 1) according to the present embodiment. The pump 1 is an assembly for transporting a fluid, typically a liquid, and includes a flexible tube 2 that forms a flow path of the fluid, a holder portion 20 that holds the tube 2, and a main body case 30. Is equipped with. The holder portion 20 and the main body case 30 are attached so as to face each other with the tube 2 interposed therebetween. In the present embodiment, the holder portion 20 can be detachably separated from the main body case 30. The upstream and downstream ends of the tube 2 are connected to upstream and downstream components (not shown), respectively. The upstream component and the downstream component can be appropriately selected according to the application of the pump 1. Further, in the example of FIG. 1, both ends of the tube 2 hardly protrude from the holder portion 20, but the length of the tube 2 is also appropriately selected according to the application of the pump 1.

The main body case 30 accommodates a drive unit 31 and a pressing unit 32 that presses the tube 2. In the present embodiment, the drive unit 31 is a motor (hereinafter, the motor is also designated by the reference numeral 31), and the pressing unit 32 is a roller (hereinafter, the roller is also designated by the reference numeral 32). The roller 32 is supported from below by a rotating body 33 also housed in the main body case 30. Unless otherwise specified, the upper and lower parts in the present embodiment are defined with reference to the state of FIG. 3B, the holder portion 20 side is the upper side, and the main body case 30 side is the lower side. The rotating body 33 is a substantially disk-shaped member having a central axis A1 (see FIG. 3B) extending in the vertical direction, and supports the roller 32 in such a manner that the roller 32 partially protrudes from the upper surface thereof. Further, the rotating body 33 and the roller 32 are housed in a state where a part thereof is exposed on the upper surface of the main body case 30.

The motor 31 rotationally drives the rotating body 33 around the central axis A1. More specifically, the output shaft of the motor 31 is connected to a rotation transmission mechanism including gears 36a, 36b, etc., and the rotation shaft 34 of the most downstream gear 36a is fixed to the rotating body 33 (see FIG. 3B). ). The rotation shaft 34 is arranged so as to extend in the vertical direction concentrically with the central shaft A1. The cross section of the rotating shaft 34 has a non-circular shape, and is inserted into an opening having substantially the same shape as the cross section of the rotating shaft 34 formed on the rotating shaft 34 and the gear 36a. Therefore, the rotating body 33 is connected to the gear 36a so as not to rotate relative to the gear 36a.

FIG. 3A is a bottom view of the roller 32 and the holder portion 20 as seen from the roller 32 side, and FIG. 3B is a side sectional view of a peripheral portion of the roller 32 and the holder portion 20. A plurality of rollers 32 are supported on the rotating body 33, and these rollers 32 are arranged around the central axis A1. The number of rollers 32 is three in this embodiment, but the number is not particularly limited and may be one. In the present embodiment, these rollers 32 are arranged at equal intervals in the circumferential direction at positions separated from the central axis A1 by substantially the same distance in the radial direction. In the description of the present embodiment, the central axis A1 is used as a reference when referring simply to the radial direction and the circumferential direction. From the above, the roller 32 is rotationally driven around the central axis A1 by the motor 31 together with the rotating body 33, and at this time, revolves around the central axis A1. That is, the motor 31 rotates the roller 32 around the central axis A1 via a rotation transmission mechanism including gears 36a, 36b, etc., a rotation shaft 34, and a rotating body 33.

FIG. 2 shows a detailed configuration of the holder portion 20. The holder portion 20 is a plate-shaped member having a substantially rectangular upper surface and a lower surface, and a tube space S on which the tube 2 is mounted is formed on the lower surface. Note that FIG. 2 shows a state in which the holder portion 20 is viewed from the lower surface side. The tube 2 is housed in the tube space S so that the tube 2 is partially curved. More specifically, the tube space S of the present embodiment is U-shaped, is continuous with the arc portion C centered on the central axis A1 and both ends of the arc portion C, and continues to the end face of the holder portion 20. It has linear portions L1 and L2. That is, the tube 2 is bent so as to draw an arc around the central axis A1 in a state of being mounted on the tube space S, and both ends thereof are configured to go out to the outside of the holder portion 20. The tube space S has a groove shape and is defined by a first wall surface 21 corresponding to the bottom surface of the groove and a second wall surface 22 and a third wall surface 23 corresponding to the side walls on both sides of the groove and standing up from the first wall surface 21. Will be done. The first wall surface 21 extends in a plane substantially orthogonal to the central axis A1, and the above-mentioned roller 32 is aligned so as to face the first wall surface 21. The third wall surface 23 faces the second wall surface 22 and is arranged radially inside the second wall surface 22 with respect to the central axis A1.

The rollers 32 all have the same shape in this embodiment, and each has a substantially conical base shape. More specifically, each roller 32 has a shape having a bottom surface 321 and an upper surface 322, and a peripheral surface 323 extending between the bottom surface 321 and the upper surface 322. Of the two surfaces 321 and 322 orthogonal to the central axis A2 of the roller 32, the one having a larger area is the bottom surface 321 and the one having a smaller area is the upper surface 322. Further, in the present embodiment, the central axis A2 substantially orthogonal to the bottom surface 321 and the top surface 322 of each roller 32 passes through the substantially center of both sides 321 and 322. That is, each roller 32 has a substantially straight cone shape.

Each roller 32 is arranged so that the bottom surface 321 faces inward in the radial direction and the top surface 322 faces inward in the radial direction with respect to the central axis A1. That is, each roller 32 is arranged so that the upper surface 322 is radially outside the bottom surface 321. Further, each roller 32 is arranged so that its central axis A2 is orthogonal to or substantially orthogonal to the central axis A1. All of the central axes A2 of the rollers 32 are generally arranged in the same plane orthogonal to the central axis A1.

With the above configuration, the peripheral surface 323 of each roller 32 forms an inclined surface 323a on the surface of the roller 32 facing the tube 2. The inclined surface 323a is a surface that inclines toward the outer side in the radial direction with respect to the central axis A1 from the tube 2 side to the roller 32 side, that is, away from the first wall surface 21. The presence of the inclined surface 323a reduces the weight of the roller 32 on the outer side in the radial direction with respect to the central axis A1 and prevents the center of gravity of the roller 32 from being separated from the central axis A1. Therefore, the moment of inertia (inertia) when the roller 32 is rotationally driven around the central axis A1 becomes small, and the driving energy is reduced.

The roller 32 has a roller shaft 324 extending along the central shaft A2, and can rotate around the roller shaft 324 while revolving around the central shaft A1 as described above. The roller shaft 324 protrudes from the bottom surface 321 and the top surface 322, and the protruding portion is supported by the rotating body 33. However, the method of supporting the roller shaft 324 is not particularly limited. The rotating body 33 of the present embodiment is composed of a first part 33a and a second part 33b, and a space is formed in a portion where the first part 33a and the second part 33b face each other, and the space accommodates the roller shaft 324. Functions as a bearing. Since the roller shaft 324 is substantially orthogonal to the central axis A1, the roller 32 can rotate around the central axis A2. In the present embodiment, the roller shaft 324 is not rotationally driven by a drive unit such as a motor, and the roller 32 receives a frictional force with its peripheral surface 323 in contact with the tube 2 when revolving around the central shaft A1. Is rotated by. That is, the roller 32 is driven by the revolution around the central axis A1 and rotates around the central axis A2.

As shown in FIG. 3B, the holder portion 20 is aligned with the main body case 30 so that the tube space S formed on the lower surface thereof accommodates a part of the roller 32. More specifically, the upper surface 322 of the roller 32 does not enter the tube space S, while a part of the bottom surface 321 and a part of the peripheral surface 323 are housed in the tube space S. At this time, the bottom surface 321 is arranged radially outside the third wall surface 23, and the top surface 322 is arranged radially outside the second wall surface 22 with respect to the central axis A1. With the above configuration, the above-mentioned inclined surface 323a included in the peripheral surface 323 of the roller 32 presses the tube 2 upward and radially outward in the tube space S. That is, the tube 2 is pressed against the first wall surface 21 and the second wall surface 22. As a result, the tube 2 is firmly housed in the tube space S, and it becomes difficult for the tube 2 to fall out of the tube space S.

Further, in the present embodiment, a spring 35 that urges the rotating body 33 toward the upper holder portion 20 is arranged below the second part 33b of the rotating body 33. The urging force of the spring 35 is a force that pushes up the roller 32 supported by the rotating body 33 upward, and thus a force that the roller 32 pushes the tube 2 against the first wall surface 21. In the present embodiment, the spring 35 makes it more difficult for the tube 2 to fall out of the tube space S.

Further, in the present embodiment, the radius of the arc portion C of the tube space S is smaller than the natural minimum bending radius of the tube 2. The natural minimum bending radius is that both ends of the tube 2 are held without any restraint being applied to the tube 2, one end is bent 180 ° with respect to the other end so that both ends are parallel to each other, and the entire tube 2 is U-shaped. It is the radius (outermost diameter) of the arc drawn by the tube 2 formed when an external force is applied so as to become. Therefore, when the tube 2 is mounted in the tube space S, the second wall surface 22 abuts on the curved portion of the tube 2 from the outside in the radial direction, and the tube 2 is strongly pressed against the second wall surface 22. That is, when the tube 2 is bent along the arc portion C so as to be mounted on the tube space S, a large restoring force that causes the tube 2 to spread toward the second wall surface 22 acts. This restoring force creates a large frictional force with respect to the second wall surface 22 of the tube 2, the tube 2 becomes less slippery with respect to the second wall surface 22, and the tube 2 can be firmly fixed in the tube space S.

Even if the radius of the arc portion C of the tube space S is equal to or larger than the natural minimum bending radius of the tube 2, the bent tube 2 exerts a restoring force that tries to return to a straight line, so that the tube 2 has a bending radius. It can be firmly fixed in the tube space S. However, setting the radius of the arc portion C of the tube space S smaller than the natural minimum bending radius has a further advantage that various parts such as the holder portion 20 and the roller 32 can be miniaturized. ..

Further, in the present embodiment, the claw portion 24 protruding toward the second wall surface 22 is formed on the third wall surface 23 in the straight portions L1 and L2 of the tube space S. The claw portion 24 is arranged at a predetermined distance in the vertical direction from the first wall surface 21, and the distance between the claw portion 24 and the first wall surface 21 is such that the tube 2 is between the claw portion 24 and the first wall surface. It is formed to the extent that it is pinched. As shown in FIG. 4A, the most protruding portion of the claw portion 24 does not reach the second wall surface 22, and a constant distance D is provided between the most protruding portion of the claw portion 24 and the second wall surface 22. Is kept. The interval D is such that the tube 2 compressed by elastic deformation can pass between the claw portion 24 and the second wall surface 22. That is, while the tube 2 can be attached to the tube space S through between the claw portion 24 and the second wall surface 22, once the tube 2 is attached to the tube space S, it is restored to its original shape due to its elasticity. The tube 2 is restrained by the claw portion 24 and does not fall out of the tube space S. With this configuration, the tube 2 can be constrained in the tube space S without the need for a separate fixing device or the like. That is, it is possible to more reliably prevent the tube 2 from falling off from the holder portion 20 while ensuring the workability of assembling the holder portion 20 to the main body case 30. As shown in FIG. 4B, in the present embodiment, the claw portion 24 is formed with a notch portion 25 along the outer peripheral surface of the tube 2, and the second wall surface 22 and the third wall surface 22 are widened by the notch portion 25. The tube 2 is housed in the space between the wall surface 23 and the wall surface 23. Further, the number of the claw portions 24 is not limited to one, and a plurality of claw portions 24 may be formed. In this embodiment, four claw portions 24 are arranged in the vicinity of the end face of the holder portion 20. Further, the claw portion 24 can be formed on the second wall surface 22 instead of the third wall surface 23, or can be formed on both surfaces 22 and 23.

Here, the height of the second wall surface 22 from the deepest part of the tube space S along the central axis A1 direction (in the present embodiment, it corresponds to the height of the second wall surface 22 with respect to the first wall surface 21). Let be h. At this time, in the present embodiment, the relationship between the height h and the radius of gyration r of the tube 2 is configured to satisfy h ≧ r. The radius of gyration of the tube 2 referred to here is a radius with respect to the outer diameter of the tube 2 when cut in a plane orthogonal to the longitudinal direction of the tube 2 in a state where no external force is applied to the tube 2. By configuring the height h in this way, it is possible to more reliably prevent the tube 2 from falling off from the holder portion 20.

As described above, in the present embodiment, various measures are taken to prevent the tube 2 from falling off from the holder portion 20. As a result, the tube 2 is stably held in an appropriate position when the tube 2 is pressed by the roller 32. That is, it is possible to prevent the position of the tube 2 from being displaced in the tube space S and the flow rate accuracy from being lowered.

<2. Operation of tube pump>
Hereinafter, the operation of the pump 1 will be described with reference to the drawings. The pump 1 is used with the holder portion 20 holding the tube 2 mounted on the main body case 30 as shown in FIG. 3B. Although not shown in FIG. 1, both ends of the tube 2 are connected to the upstream component and the downstream component, respectively. As shown in FIG. 3B, the tube 2 in the tube space S when the holder portion 20 is attached to the main body case 30 is surrounded by the first wall surface 21, the second wall surface 22, and the roller 32.

The motor 31 is connected to a power source or battery (not shown) via lead wires. When the switch of the pump 1 is turned on and power is supplied to the motor 31 from the power supply or the battery, the motor 31 rotates and the rotating shaft 34 is rotated. At this time, the rotation speed of the motor 31 is decelerated by the rotation transmission mechanism including the gears 36a, 36b and the like, and is transmitted to the rotation shaft 34. The drive of the motor 31 may be intermittent or continuous.

The rotating body 33 rotates around the central axis A1 together with the rotating shaft 34. Then, with the rotation of the rotating body 33, the roller 32 also rotates (revolves) around the central axis A1 and presses the tube 2 so as to block the flow path in the tube 2 by the peripheral surface 323. At this time, the fluid is stored in the tube 2 on the upstream side of the point P where the roller 32 closes the tube 2. When the roller 32 further rotates and moves from the point P to the downstream side, the fluid stored from the upstream side moves to the point P. When the roller 32 rotates again and turns around the point P, the fluid at the point P is moved to the downstream side by the roller 32, and the flow path in the tube 2 is blocked again. By repeating the above operation, the pump 1 can send the fluid from the upstream component to the downstream component at a predetermined flow rate. That is, the roller 32 revolves around the central axis A1 and presses the tube 2 in a certain direction along the curved portion of the tube 2, and the fluid is conveyed in the tube 2 by the operation of the roller 32. Will be done. Since the roller 32 is rotatably supported around the roller shaft 324, it also rotates (rotates) around the central shaft A2 due to the frictional force generated between the tube 2 and the peripheral surface 323. In this way, the roller 32 revolves around the central axis A1 and follows it to rotate around the central axis A2, thereby smoothly performing a pressing operation and reducing the load on the motor 31 due to frictional resistance. be able to. Therefore, the driving energy required to revolve the roller 32 is reduced.

The spring 35 urges the rotating body 33 including the roller 32 from the side of the second part 33b toward the holder portion 20. By doing so, the tube 2 can be firmly accommodated in the tube space S, and the proper position of the roller 32 with respect to the tube 2 can be maintained.

As described above, the tube 2 is held in the tube space S in a state of being firmly in contact with the first wall surface 21 and the second wall surface 22 of the arc portion C of the tube space S due to the restoring force acting by bending. ing. In addition, since the tube 2 is pushed from the inside in the radial direction toward the second wall surface 22 by the inclined surface 323a of the roller 32, the tube 2 is prevented from moving toward the third wall surface 23 and escaping from the pressing of the roller 32. be able to. Further, due to the presence of the inclined surface 323a, it is possible to press the tube 2 until the roller 32 closes the tube 2 while avoiding interference between the second wall surface 22 and the third wall surface 23 and the peripheral surface 323 of the roller 32.

<3. Features>
The tube 2 used in this embodiment has a radius of gyration r of about 1 (mm). As described above, when the tube having a relatively small diameter is attached to a predetermined position of the device, the skill level of the operator is usually required. However, by configuring the tube space S as in the present embodiment, for example, even a general user who is not skilled in the tube mounting work can appropriately mount the tube 2 in the tube space S. Become. Further, once the tube 2 is attached to the tube space S, it is unlikely to fall off. Further, since a tube having a special shape is not required, it is possible to improve the convenience and reduce the cost. The radius of gyration r of the tube 2 is only an example, and the radius of gyration r of the tube 2 can be appropriately changed according to the application of the pump 1.

<4. Modification example>
Although some embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the present invention. For example, the following changes are possible. In addition, the gist of the following modifications can be combined as appropriate.

<4-1>
The form of the pressing portion 32 is not limited to the roller, and the pressing portion 32 may be configured to be non-rotating. When the pressing portion 32 cannot rotate, the pressing portion 32 always faces the same surface with respect to the tube 2. In that case, it is only necessary to form the surface of the pressing portion 32 facing the tube 2 as an inclined surface that inclines from the tube 2 side to the roller 32 side as the distance from the central axis A1 increases. The shape can be set arbitrarily.

<4-2>
The shape of the pressing portion 32 is not limited to a substantially conical base, and may be, for example, a substantially conical shape. It is also possible to use a substantially cylindrical cylinder or a substantially oblique cylinder having the same diameter on the upper surface and the bottom surface. In this case, by appropriately inclining the central axis A2 with respect to the direction orthogonal to the central axis A1, the distance from the central axis A1 to the surface facing the tube 2 in the pressing portion 32 is from the tube 2 side to the roller 32 side. It is possible to form an inclined surface that inclines to.

<4-3>
In the above embodiment, the central axis A2, which is the rotation axis of the roller 32, intersects the central axis A1 which is the revolution axis so as to be orthogonal to the central axis A1, but the rotation axis A2 is relative to the straight line orthogonal to the revolution axis A1. It may intersect the central axis A1 so as to form an angle.

<4-4>
One of the holder portion 20 and the main body case 30 has an engaging portion, and the other has an engaged portion that is engaged with the engaging portion, and engages the engaged portion with the engaged portion. Then, the holder portion 20 may be configured to be positioned with respect to the main body case 30. FIG. 5 is a perspective view of the holder portion 20 and the main body case 30 configured in this way. In the example of FIG. 5, as an engaging portion, three convex portions 201 projecting toward the upper surface of the main body case 30 are formed on the surface of the holder portion 20 facing the roller 32. On the other hand, as an engaged portion, a recess 301 recessed toward the inside of the main body case 30 is formed on the surface of the main body case 30 facing the holder portion 20. The three convex portions 201 and the three concave portions 301 are formed at positions corresponding to one-to-one when the holder portion 20 and the main body case 30 face each other. When the three sets of the convex portions 201 and the concave portions 301 are engaged with each other, the holder portion 20 is aligned with the main body case 30 at the correct position. As a result, the flow rate accuracy of the pump 1 is improved.

The convex portion 201 as the engaging portion may be provided on either the holder portion 20 or the main body case 30. However, when the holder portion 20 is a disposable part and the main body case 30 and the unit including various parts such as the drive portion 31 and the roller 32 housed therein are used as reusable parts, the convex portion 201 is used. It is desirable that the holder portion 20 is provided. This is because the convex portion 201 is more easily damaged by breaking or the like than the concave portion 301. Further, the holder portion 20 may have a convex portion and a concave portion, and the main body case 30 may have a concave portion and a convex portion corresponding to these. Further, the shapes of the engaged portion and the engaged portion and the number of pairs of both are not limited to this example, and can be appropriately changed, but the accuracy of positioning between the holder portion 20 and the main body case 30 is improved. From the viewpoint, the number of pairs of the engaged portion and the engaged portion is preferably a plurality.

<4-5>
One of the holder portion 20 and the main body case 30 has a magnet on the surface facing the other, and the other of the holder portion 20 and the main body case 30 faces the magnet and is magnetically attracted to the magnet. It may have a magnetic material or a magnet. With this configuration, positioning of the holder portion 20 becomes easier, and operability of attachment / detachment work to / from the main body case 30 is improved. In the example shown in FIG. 5, the main body case 30 has two magnets 302 and 302 on the surface facing the holder portion 20. In this example, only the upper surface of the magnet 302 is exposed from the upper surface of the main body case 30, and the upper surface of the magnet 302 is embedded in the main body case 30 so as to be substantially flush with the upper surface of the main body case 30. On the other hand, the holder portion 20 has two magnetic bodies 202 and 202 facing the magnets 302 and 302, respectively, when combined with the main body case 30. In this example, the magnetic body 202 is fixed to the holder portion 20 so that the surface facing the magnet 302 is substantially flush with the surface of the holder portion 20 facing the main body case 30. At least one of the magnetic materials 202 and 202 can be changed to a magnet. The magnet 302 magnetically attracts the magnetic material 202 facing each other to fix the position of the holder portion 20 with respect to the main body case 30. The strength of the force with which the magnet 302 attracts the magnetic material 202 can be such that the user can hold the main body case 30 in one hand and separate the holder portion 20 with the other hand. The number of sets of magnets and magnetic materials is not limited to the example of FIG. 5, and can be appropriately set. Further, it is also possible to form the engaged portion and the engaged portion of the modified example 4-4 with a magnet, or with a magnet and a magnetic material.

<4-6>
The first wall surface 21 that defines the tube space S of the holder portion 20 has an inclined portion 210 that inclines from the tube 2 side to the roller 32 side, which is a pressing portion, toward the outer side in the radial direction with respect to the central axis A1. You may. FIG. 6A is a perspective view of the holder portion 20 configured in this way, and FIG. 6B is a side sectional view showing the peripheral structure of the holder portion 20 having the inclined portion 210 and the roller 32. The inclination angle at which the inclined portion 210 is inclined with respect to the plane orthogonal to the central axis A1 is not particularly limited, but as shown in FIG. 6B, the inclined surface formed by the peripheral surface 323 of the roller 32 when the tube pump 1 operates. It is desirable that the inclination angle is parallel to or substantially parallel to 323a. Further, at this time, it is desirable that the upper surface 322 of the roller 32 is configured to be positioned inward in the radial direction with respect to the central axis A1 with respect to the second wall surface 22. By doing so, since the tube 2 is surrounded by the inclined portion 210, the second wall surface 22, and the peripheral surface 323 (inclined surface 323a), the pressing force of the roller 32 is easily transmitted to the tube 2, and the tube 2 is laid. It can be closed more reliably. Further, the dimensions when the tube 2 is closed can be easily specified, and the dimensions of the roller 32, the first wall surface 21, and the like can be determined based on the same dimensions, which facilitates the design of the pump 1. ..

<4-7>
The first wall surface 21 further has a horizontal portion 211 that is continuous with the radial outer peripheral edge of the inclined portion 210 and is substantially orthogonal to the central axis A1, and the second wall surface 22 is from the radial outer peripheral edge of the horizontal portion 211. It may be configured to stand up. FIG. 7A is a side sectional view of the holder portion 20 having the inclined portion 210 but not the horizontal portion 211, and FIG. 7B is a side sectional view of the holder portion 20 having the inclined portion 210 and the horizontal portion 211. be. When the horizontal portion 211 is formed as shown in FIG. 7B, the pocket portion P is formed by the horizontal portion 211 and the second wall surface 22. The pocket portion P functions as an adhesive reservoir when the tube 2 is fixed to the tube space S by using an adhesive. For example, when an adhesive is applied to the radial outer surface of a bent portion (a portion along the arc portion C) of the tube 2 and fixed to the first wall surface 21 and the second wall surface 22, the adhesive applied to the tube 2 is applied. Accumulates in the pocket portion P and does not easily flow out from the inclined portion 210 in the direction of the central axis A1 and downward. In this way, the tube 2 can be firmly adhered to the tube space S. As a result, the tube 2 is less likely to fall out of the tube space S.

1 Pump 2 Tube 20 Holder part 21 1st wall surface 22 2nd wall surface 23 3rd wall surface 24 Claw part 25 Notch part 30 Main body case 31 Drive part (motor)
32 Pressing part (roller)
33 Rotating body 34 Rotating shaft 35 Biasing member (spring)
201 Recess (engagement part)
202 Magnetic material (magnet)
210 Inclined part 211 Horizontal part 301 Convex part (engaged part)
302 Magnet 321 Bottom surface 322 Top surface 323 Peripheral surface 323 Inclined surface 324 Roller shaft A1, A2 Central axis C Arc part L1, L2 Straight line part S Tube space r Tube cross-sectional radius h Second wall height D Second wall surface 22 and claws Distance from part 24 P Pocket part

Claims (11)

Flexible tubes for transporting fluids,
A holder that holds the tube so that it is at least partially curved,
The drive unit and
The drive unit is rotationally driven around the first central axis, and while rotating around the first central axis, the tube is pressed along a curved portion of the tube held by the holder portion. At least one pressing part that conveys the fluid in the tube, and
Equipped with
The holder portion has a tube space in which the tube is housed.
The tube space is
The first wall surface facing the pressing portion and
It is defined by a second wall surface that stands up from the first wall surface and abuts on the curved portion of the tube from the outside in the radial direction with respect to the first central axis.
The pressing portion has an inclined surface that is inclined from the tube side to the pressing portion side so as to go outward in the radial direction with respect to the first central axis on the surface of the pressing portion facing the tube. In the tube space, the tube is pressed outward in the radial direction with respect to the first central axis, and is in the form of a roller that can rotate around the second central axis intersecting the first central axis. It is roughly in the shape of a cone,
The conical base has a bottom surface substantially orthogonal to the second central axis, a bottom surface substantially orthogonal to the second central axis, a smaller area than the bottom surface, and a radial outer side of the bottom surface with respect to the first central axis. It has an upper surface arranged in, and a peripheral surface extending between the lower surface and the upper surface.
The inclined surface is included in a portion of the pressing portion corresponding to the peripheral surface .
Tube pump. The pressing portion follows the rotation around the first central axis and rotates around the second central axis.
The tube pump according to claim 1 . When the height of the second wall surface from the deepest part of the tube space in the direction of the first central axis is h and the radius of the cross section of the tube is r, h ≧ r.
The tube pump according to claim 1 or 2 . The first wall surface has an inclined portion that is inclined from the tube side to the pressing portion side toward the outer side in the radial direction with respect to the first central axis.
The tube pump according to any one of claims 1 to 3 . The first wall surface further has a horizontal portion that is continuous with the inclined portion, is substantially orthogonal to the first central axis, and is arranged radially outside the inclined portion with respect to the first central axis. ,
The second wall surface stands up from the horizontal portion.
The tube pump according to claim 4 . Flexible tubes for transporting fluids,
A holder that holds the tube so that it is at least partially curved,
The drive unit and
The drive unit is rotationally driven around the first central axis, and while rotating around the first central axis, the tube is pressed along a curved portion of the tube held by the holder portion. At least one pressing part that conveys the fluid in the tube, and
Equipped with
The holder portion has a tube space in which the tube is housed.
The tube space is
The first wall surface facing the pressing portion and
It is defined by a second wall surface that stands up from the first wall surface and abuts on the curved portion of the tube from the outside in the radial direction with respect to the first central axis.
The pressing portion has an inclined surface that is inclined from the tube side to the pressing portion side so as to go outward in the radial direction with respect to the first central axis on the surface of the pressing portion facing the tube. In the tube space, the tube is pressed outward in the radial direction with respect to the first central axis.
The first wall surface is continuous with an inclined portion that is inclined from the tube side to the pressing portion side and is continuous with the inclined portion and is on the first central axis so as to move outward in the radial direction with respect to the first central axis. It has a horizontal portion that is substantially orthogonal and is arranged radially outside the inclined portion with respect to the first central axis.
The second wall surface stands up from the horizontal portion.
Tube pump. The tube space is
It is further defined by a third wall surface that stands up from the first wall surface, faces the second wall surface, and is arranged radially inward with respect to the first central axis with respect to the second wall surface.
One of the third wall surface and the second wall surface projects from a height position at a predetermined distance from the first wall surface toward the other of the third wall surface and the second wall surface, and the said from the tube space. Includes claws to prevent the tube from falling off,
The tube pump according to any one of claims 1 to 6 . A main body case for accommodating the driving unit and the pressing unit is further provided.
The holder portion and the main body case are configured to be separable.
The tube pump according to any one of claims 1 to 7 . One of the holder portion and the main body case has an engaging portion and has an engaging portion.
The other of the holder portion and the main body case has an engaged portion that is engaged with the engaging portion.
When the engaging portion and the engaged portion are engaged, the holder portion is configured to be positioned with respect to the main body case.
The tube pump according to claim 8 . One of the holder portion and the main body case has a magnet on a surface facing the other, and the other of the holder portion and the main body case faces the magnet and is magnetically attracted to the magnet. Has a magnetic material or magnet,
The tube pump according to claim 8 or 9 . Further provided with an urging member for urging the pressing portion toward the holder portion.
The tube pump according to any one of claims 1 to 10 .

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