JP5108080B2 - Tube pump - Google Patents

Description

  The present invention relates to a tube pump mounted on an artificial dialysis machine or the like.

  2. Description of the Related Art Conventionally, there has been provided a tube pump that sends out liquid in a tube by rotating a rotor portion having a pressure roller with a drive motor and squeezing the tube through which the liquid flows with the pressure roller (see, for example, Patent Document 1). ).

  Such a rotor part includes a rotor body part that engages with a drive shaft of a drive motor, a pair of swing arms that are pivotally supported at symmetrical positions of the rotor body part, and a pair of swing parts. A pressing roller rotatably supported at each tip of the moving arm, and a compression spring that urges the swinging arm in a direction to open outward are configured. The rotor body and the swing arm are mainly made of a metal material such as aluminum die casting.

JP-A-6-218042

  By the way, depending on the specification of the blood return and the dialyzer, the rotor portion may be used by rotating it in the reverse direction. Even in such a case, it is desired to prevent a large torque fluctuation from occurring in the drive motor.

  However, the swing arm of the tube pump described in Patent Document 1 can apply a predetermined pressing force to the tube by the pressing roller contacting the tube at a certain angle during the forward rotation of the rotor portion. It is configured. Therefore, when the rotor portion rotates in the reverse direction, the pressing roller cannot contact the tube at a constant angle, and the pressing force applied to the tube by the pressing roller increases. As a result, the reaction force (load) of the pressing force that the pressing roller (rotor) receives from the tube also increases, and a large torque fluctuation occurs in the drive motor (drive shaft). Therefore, it has been desired to provide a tube pump that can suppress the torque fluctuation of the drive motor regardless of the rotation direction of the rotor portion.

  An object of this invention is to provide the tube pump which can suppress the torque fluctuation of a drive motor irrespective of the rotation direction of a rotor part.

  The present invention includes an arc-shaped inner peripheral wall surface, a casing in which a tube through which a liquid flows is arranged along the inner peripheral wall surface, a drive motor having a drive shaft that can rotate forward and reverse, A rotor body that rotates with the drive shaft at a central position, and a rotor body that is engaged with the rotor body so as to be movable in a direction away from or close to the drive shaft on a plane orthogonal to the drive shaft and is rotatable. A roller support that is engaged with the rotor body, a pressure roller that is rotatably supported by the roller support and presses the tube against the inner wall surface, the rotor body, and the roller support. The roller support portion is disposed between the urging member and urges the roller support portion in a direction away from the drive shaft, and the roller support portion rotated in a circumferential direction around the drive shaft is moved to a position before the rotation. To return And the rotor main body portion is provided on both sides of the direction in which the drive shaft extends and the direction in which the drive shaft extends and the direction intersecting with the bias direction by the biasing means. A pair of engagement projections extending in the direction in which the drive shaft extends and engaging with the engagement projections to form a pivot fulcrum of the roller support portion. The present invention relates to a tube pump having a joint recess.

  In the present invention, the pressing roller pressing the tube receives a reaction force (load) from the tube. The load acts on a roller support portion that supports the pressing roller. When the rotor main body rotates as the drive shaft rotates, the rotation of the rotor main body is transmitted to the roller support that engages with the rotor main body, and the engagement convex portion on the rotation direction side of the roller support is the roller support. The rotor main body part is pulled in the rotational direction by engaging with the engaging concave part on the rotational direction side. Therefore, due to the reaction force from the tube acting on the pressing roller, the roller support portion is acted on by a rotational force with the engaging concave portion and the engaging convex portion on the rotation direction side being engaged, The roller support portion rotates so as to release the load against the urging force. Therefore, it is possible to suppress a large load from being applied to the rotor main body via the roller support portion, and it is possible to suppress a large torque fluctuation from occurring on the drive shaft.

  Further, when the rotor main body further rotates, and the pressing roller that has pressed the tube is separated from the tube and no longer receives a load from the tube, the rotated roller support portion is caused by the biasing force of the biasing means. Return to the position before rotation. The other pressing roller that has not pressed the tube operates in the same manner as the pressing roller that pressed the tube by the rotation of the rotor body. Thus, when the rotor body rotates, the tube is continuously squeezed by the pressing roller, and the liquid in the tube is delivered.

  Further, since the rotor main body and the roller support are engaged by the engagement convex part and the engagement concave part to form a rotation fulcrum, the roller support part rotates with respect to the rotor main body with a simple configuration. can do.

  On the other hand, when the rotor body part is rotated in the reverse direction, the rotor body part has an engaging convex part on the rotational direction side (opposite to the above) and an engaging concave part on the rotational direction side (opposite to the above) of the roller support part. In order to engage, the roller support portion rotates with this engagement position as a rotation fulcrum, and rotates against the urging force so as to release the load acting on the pressing roller. Therefore, according to the rotation direction of a drive shaft, it becomes a structure where the rotation fulcrum in the rotor main-body part of a roller support part changes to the position which is easy to release the load from a tube. Therefore, even when the rotor main body is rotated in the reverse direction, the drive motor can be driven without imposing a large torque burden on the drive motor as compared with the case of normal rotation.

  Moreover, it is preferable that the said rotor main-body part and the said roller support part, or this rotor main-body part consist of predetermined resin.

  According to the present invention, it is not necessary to perform drilling or finishing after molding as compared with a conventional one formed by aluminum die casting. Further, post-processing such as shot blasting and plating is not required.

  Moreover, it is preferable that the said engagement convex part consists of a metal shaft part fixed to the said rotor main-body part, and the resin-made color part which covers this shaft part.

  According to the present invention, the strength of the engaging projection can be ensured by the metal shaft. In addition, smooth sliding performance with the engaging recess can be ensured by the resin collar portion.

  Moreover, it is preferable that the engaging convex part is provided integrally with the rotor main body part.

  According to the present invention, the engaging convex portion can be easily formed integrally with the rotor main body portion, and the number of parts can be reduced.

  Further, it is preferable that the urging means is a compression coil spring, and the rotor main body has a spring accommodating recess that is recessed toward the drive shaft and accommodates the compression coil spring.

  According to the present invention, the biasing means can be configured easily and inexpensively by using the compression coil spring which is a general-purpose component. In addition, by providing the spring accommodating recess, it is possible to easily secure a space for arranging the compression coil spring, and to shorten the length of the rotor main body in the urging direction.

  According to the present invention, since the roller support portion engaged with the rotor main body portion changes its rotation center according to the rotation direction of the rotor main body portion, it is suppressed that a large load is applied to the rotor main body portion, It is possible to provide a tube pump that can suppress torque fluctuation of the drive motor regardless of the rotation direction of the rotor portion.

It is a perspective view showing the whole tube pump 1 composition of a 1st embodiment of the present invention. It is a perspective view which shows the rotor part 5 of the tube pump 1. FIG. It is sectional drawing cut | disconnected by the AA line shown in FIG. It is sectional drawing cut | disconnected by the BB line shown in FIG. It is a fragmentary sectional view which shows the operation state of the rotor part 5 at the time of counterclockwise rotation. It is a fragmentary sectional view which shows the operation state of the rotor part 5 at the time of clockwise rotation. It is a perspective view showing rotor part 5A of tube pump 1A of a 2nd embodiment of the present invention. It is sectional drawing cut | disconnected by the CC line | wire shown in FIG. It is sectional drawing cut | disconnected by the DD line | wire shown in FIG.

[First Embodiment]
Below, the structure of the tube pump 1 of 1st Embodiment of this invention is demonstrated, referring FIGS. 1-4. FIG. 1 is a perspective view showing an overall configuration of a tube pump 1 according to a first embodiment of the present invention. FIG. 2 is a perspective view showing the rotor portion 5 of the tube pump 1. 3 is a cross-sectional view taken along line AA shown in FIG. 4 is a cross-sectional view taken along line BB shown in FIG.

  First, the whole structure of the tube pump 1 of 1st Embodiment of this invention is demonstrated, referring FIG. As shown in FIG. 1, a tube pump 1 according to a first embodiment of the present invention includes a casing 2 in which a tube 3 (see FIG. 5) through which a liquid (not shown) flows is disposed, and a drive motor 4 having a drive shaft 4a. The rotor portion 5 and the cover portion 6 are provided as main components, which are arranged inside the casing 2 and rotate by the rotation of the drive shaft 4a to squeeze the tube 3.

  The casing 2 is made of, for example, a synthetic resin, and includes an inner peripheral wall surface 2 a, an accommodation recess 7, a cover 8, a guide recess 9, and a tube clamp 10. The inner peripheral wall surface 2a has an arc shape when the casing 2 is viewed from the direction in which the drive shaft 4a extends (see FIG. 5). The accommodating recess 7 is open upward and accommodates the tube 3 and the rotor portion 5. The inner peripheral wall surface 2 a forms a part of the housing recess 7. The cover 8 is made of a transparent resin and opens and closes the housing recess 7. The guide recess 9 is open in the horizontal direction and guides the tube 3 to the outside of the housing recess 7. The tube clamp 10 presses the tube 3 disposed in the guide recess 9 and detachably locks it. Note that the casing 2 is not limited to resin, and can be made of metal.

  The tube 3 is made of a transparent resin having a predetermined elasticity. The tube 3 is disposed along the inner peripheral wall surface 2 a in the housing recess 7. The drive shaft 4a of the drive motor 4 is configured to be able to rotate forward and reverse. The drive shaft 4a is disposed at the center position of an arc that forms the inner peripheral wall surface 2a.

  The cover portion 6 includes a rotor cover portion 6a that is connected to the rotor portion 5 and covers the outer surface of the rotor portion 5, and a handle portion 6b that is provided in the rotor cover portion 6a so as to be housed and can be gripped. . The handle portion 6b is for manually rotating the rotor portion 5 when the drive motor 4 is not driven due to failure or the like. In the following description, the cover portion 6 is removed from the rotor portion 5 for convenience of explanation.

  Next, details of the rotor unit 5 will be described with reference to FIGS. As shown in FIG. 2, the rotor unit 5 includes a rotor main body unit 20, a pair of roller support units 40 that engage with the rotor main unit unit 20, and a pair of pressure rollers that are rotatably supported by the roller support unit 40. 50 and a compression coil spring (biasing means) 60 having a predetermined elastic force.

  The rotor body 20 is a member that rotates together with the drive shaft 4a at the center position of the arc that forms the inner peripheral wall surface 2a of the casing 2 (see FIG. 1). As shown in FIG. 2, the rotor main body 20 includes four top plates 21, a bottom plate 22, a connecting portion 23, a shaft hole 24, and four engagements provided at symmetrical positions around the drive shaft 4 a. The convex part 25 and the spring accommodating recessed part 28 are provided.

  As shown in FIG. 2, the top plate portion 21 has a substantially rectangular shape in plan view and constitutes the upper portion of the rotor main body portion 20. As shown in FIGS. 2 and 3, the bottom plate portion 22 has a substantially rectangular shape in plan view and constitutes a lower portion of the rotor main body portion 20. The top plate portion 21 and the bottom plate portion 22 are arranged in parallel. The top plate portion 21 and the bottom plate portion 22 are orthogonal to the drive shaft 4a.

  The connecting portion 23 is disposed between the top plate portion 21 and the bottom plate portion 22 and connects the top plate portion 21 and the bottom plate portion 22. As shown in FIGS. 3 and 4, the connecting portion 23 includes a prismatic portion 23 a located at the center and two partition wall portions 23 b. The prism portion 23a extends along the direction P1 in which the drive shaft 4a extends, and is configured in a substantially quadrangular prism shape. As shown in FIG. 3, the partition wall portion 23 b has a direction (hereinafter referred to as “biasing direction”) P <b> 2 (or P <b> 3) in which a later-described compression coil spring 60 is biased from the center on both sides of the prismatic portion 23 a. Each extends in the intersecting direction P4 (or P5).

  As shown in FIGS. 2 to 4, the shaft hole portion 24 is provided so as to penetrate the top plate portion 21, the coupling portion 23, and the bottom plate portion 22. The drive shaft 4 a is inserted through the shaft hole portion 24. The top plate portion 21, the connecting portion 23, and the bottom plate portion 22 are integrally formed of, for example, a GF reinforced grade engineering plastic filled with a glass filler. The rotor body 20 configured as described above is connected to the drive shaft 4a.

  As shown in FIGS. 2 and 3, in the rotor main body 20, the engagement protrusions 25 are provided at positions of four corners of a substantially square centered on the drive shaft 4 a. The engaging protrusion 25 extends in the direction P1 in which the drive shaft 4a extends. Further, the engaging convex portion 25 is positioned in a state of protruding in the direction P4 (or P5) intersecting the direction P1 in which the drive shaft 4a extends and the biasing direction P2 (or P3). Specifically, as shown in FIG. 3, the engaging convex portion 25 includes a shaft portion 26 that is fixed to the rotor main body portion 20 (the top plate portion 21 and the bottom plate portion 22), and a collar portion that covers the shaft portion 26. 27.

  The axial part 26 is comprised by the column shape with the metal. The collar portion 27 is formed in a cylindrical shape from resin. The collar portion 27 is preferably made of, for example, polyacetal having good slidability. The engaging convex portion 25 configured as described above engages with the roller support portion 40. As shown in FIGS. 3 and 4, the spring accommodating recess 28 is provided so as to be recessed toward the drive shaft 4 a in the connecting portion 23, and accommodates a compression coil spring 60 (described later).

  Each of the pair of roller support portions 40 is a member that rotatably supports the pressing roller 50. As shown in FIG. 3, the roller support portion 40 is configured such that the cross-sectional shape is substantially C-shaped and opens toward the rotor main body portion 20 side. Both end portions on the open side of the roller support portion 40 extend so as to wrap around to a position facing the biasing direction P3 (or P2) side surface of the engaging convex portion 25, thereby forming an engaging concave portion 42. Yes. The roller support portion 40 has a roller recess 43 and a tube guide roller 47 on the opposite side of the rotor body 20.

  As shown in FIG. 3, the engaging recess 42 extends in the direction P1 in which the drive shaft 4a extends. The engaging recess 42 engages with the collar portion 27 of the rotor body 20 (engaging projection 25). Specifically, the size of the engaging recess 42 in the biasing direction P <b> 2 (or P <b> 3) is larger than the size (diameter) of the collar portion 27. Further, in the engaging recess 42, a portion that engages (contacts) with the collar portion 27 is formed in an arc shape.

  As shown in FIG. 3, the roller recess 43 is formed in the central portion of the roller support portion 40 opposite to the rotor main body portion 20 so that a predetermined gap is formed between the roller recess portion 43 and the outer peripheral surface of the pressure roller 50. Concave in an arc shape. The tube guide roller 47 is provided at a position adjacent to the pressing roller 50. The tube guide roller 47 regulates the position of the tube 3 in the direction P1 in which the drive shaft 4a extends.

  As shown in FIGS. 2 and 3, the roller support portion 40 configured in this way is movable to the rotor body 20 so as to be movable in a direction away from or close to the drive shaft 4 a on a plane orthogonal to the drive shaft 4 a. Engaged. Further, the engagement concave portion 42 of the roller support portion 40 is rotatably engaged with the engagement convex portion 25 of the rotor main body portion 20. As described above, the distal end portion on the open side of the roller support portion 40 extends so as to wrap around the surface on the biasing direction P3 (or P2) side of the engaging convex portion 25 to be engaged. Therefore, even if the roller support part 40 rotates as described above, the roller support part 40 does not fall off from the engagement convex part 25 of the rotor main body part 20.

  Here, since the roller support portion 40 engages with one of the two engagement convex portions 25 and rotates around the engagement convex portion 25, the roller support portion 40 swings with respect to the rotor body portion 20. Will be supported.

  The pressing roller 50 is rotatably supported by the pair of roller support portions 40 and presses the tube 3 against the inner peripheral wall surface 2a of the casing 2 (see FIG. 5). As shown in FIG. 4, the pressing roller 50 includes a support shaft 51, a bearing 52, and a roller portion 53. The support shaft 51 extends in parallel with the direction P1 in which the drive shaft 4a extends, and is fixed to the roller support portion 40. The bearing 52 is fixed to the roller portion 53 and supports the roller portion 53 in a freely rotatable manner by bringing the bearing 52 into sliding contact with the support shaft 51. The roller portion 53 is a portion that contacts the tube 3 (see FIG. 5) and presses the tube 3.

  As shown in FIGS. 3 and 4, the compression coil spring 60 is housed in the spring housing recess 28 of the rotor body 20 and is disposed between the rotor body 20 and the roller support 40. One end of the compression coil spring 60 is led out from the spring accommodating recess 28 and presses the roller support 40. Thereby, the compression coil spring 60 urges the roller support portion 40 (pressing roller 50) in a direction away from the drive shaft 4a. Further, the compression coil spring 60 urges the roller support portion 40 rotated about the engaging convex portion 25 to return to the position before the rotation.

  Next, operation | movement of the tube pump 1 of 1st Embodiment is demonstrated, referring FIG.5 and FIG.6. FIG. 5 is a partial cross-sectional view showing the operating state of the rotor unit 5 during counterclockwise rotation. FIG. 6 is a partial cross-sectional view showing the operating state of the rotor unit 5 during clockwise rotation.

  Of the pressure rollers 50 urged by the compression coil spring 60, the pressure roller 50 in contact with the tube 3 (the pressure roller 50 positioned upward in FIG. 5) is in the center direction from the tube 3 toward the drive shaft 4a. Receiving reaction force (load). As shown in FIG. 5, when the rotor body 20 rotates counterclockwise in plan view by driving the drive shaft 4 a, the pressing roller 50 in contact with the tube 3 reacts with the reaction force (load) from the tube 3. ) And a reaction force (load) opposite to the rotation direction of the rotor body 20. For this reason, a load that combines these two forces acts on the pressing roller 50.

  The roller support part 40 is rotated (inclined) around the engaging convex part on the rotation direction side among the engaging convex parts 25 engaged with the roller support part 40 so as to release the load. Therefore, the load that the roller support part 40 receives is reduced. Therefore, it is possible to suppress the load on the rotor main body 20 via the roller support portion 40. As a result, the load on the drive shaft 4a is suppressed.

  Further, when the rotor body 20 further rotates and the pressing roller 50 that has pressed the tube 3 is separated from the tube 3 and no longer receives a load from the tube 3, the rotor main body 20 rotates around the engaging convex portion 25. The roller support portion 40 thus restored returns to the position before the rotation by the urging force (restoring force) of the compression coil spring 60.

  Further, the other pressing roller 50 (the pressing roller 50 positioned below in FIG. 5) that has not been in contact with the tube 3 comes into contact with the tube 3 due to the rotation of the rotor body 20, and the pressing roller 50 ( The operation is the same as that of the pressing roller 50) located at the upper side in FIG. Thus, when the rotor main body 20 rotates, the tube 3 is continuously squeezed by the pressing roller 50, and the liquid in the tube 3 is transferred.

  Further, as shown in FIG. 6, when the rotor body 20 is rotated clockwise, the rotation direction of the roller support portion 40 is merely opposite to the above case, and the same effect as the above case is obtained. It becomes. Therefore, even when the rotor body 20 is rotated clockwise, the drive motor 4 can be driven without imposing a large torque load on the drive motor 4 compared to when rotating counterclockwise. .

  According to the tube pump 1 of 1st Embodiment demonstrated above, each effect shown below is show | played. The tube pump 1 according to the first embodiment is engaged with the rotor body 20 so as to be movable in a direction away from or close to the drive shaft 4a in a plane orthogonal to the drive shaft 4a, and is rotatable in the rotor body portion. The pair of roller support portions 40 engaged with 20, the pressing roller 50, and the roller support portion 40 are urged away from the drive shaft 4 a, and the rotated roller support portion 40 is moved to the position before the rotation. The rotor body 20 extends in the direction in which the drive shaft 4a extends, and the direction in which the drive shaft 4a extends and the direction in which the compression shaft spring 60 biases. The roller support part 40 extends in the direction in which the drive shaft 4a extends and engages with the engagement convex part 25 to rotate the roller support part 40. fulcrum A pair of engaging recesses 42 to be formed.

  Therefore, when the pressing roller 50 (roller support portion 40) receives an excessive reaction force (load) from the tube 3 due to the rotation of the rotor body portion 20, the rotation direction in which the roller support portion 40 is engaged. Rotation force with the engaging concave portion 42 on the side and the engaging convex portion 25 as the rotation fulcrum acts, and the roller support portion 40 rotates so as to release the load against the urging force. Accordingly, it is possible to suppress an excessive load from being applied to the rotor body 20 via the roller support portion 40, and as a result, it is possible to suppress the torque fluctuation of the drive shaft 4a.

  Further, when the rotor main body 20 is rotated in the reverse direction, the rotor main body 20 has an engagement convex portion 25 on the rotation direction side (opposite to the above) on the rotation direction side (opposite to the above) of the roller support portion 40. Engage with the engaging recess 42. For this reason, the roller support portion 40 rotates with this engagement position as a rotation fulcrum, and rotates against the urging force so as to release the load acting on the pressing roller 50. Therefore, the rotation fulcrum in the rotor main body 20 of the roller support portion 40 has a structure in which the load from the tube 3 is easily changed according to the rotation direction of the drive shaft 4a. Therefore, even when the rotor main body 20 is rotated in the reverse direction, the drive motor 4 can be driven without imposing a large torque load on the drive motor 4 as compared with the case of normal rotation.

  Further, in the tube pump 1 of the first embodiment, the rotor body 20 and the roller support 40 are integrally formed of a predetermined engineering plastic. Therefore, compared with what was shape | molded by the conventional aluminum die casting, the drilling process after finishing and finishing can be made unnecessary. Further, post-processing such as shot blasting and plating can be eliminated. In addition, engineering plastics have a lower specific gravity than metals and have a higher specific strength than ordinary plastics, so that the weight of the apparatus can be reduced.

  Further, in the tube pump of the first embodiment, the rotor body 20 has the engaging projection 25 that protrudes in the predetermined direction and engages with the roller support 40, and the roller support 40 has the drive shaft 4a. The engaging recess 42 extends in the extending direction and engages with the collar portion 27. Therefore, the rotor main body 20 and the roller support portion 40 can be engaged with each other with a simple configuration.

  In the tube pump 1 of the first embodiment, the engagement convex portion 25 includes a metal shaft portion 26 that is fixed to the rotor main body portion 20, a resin collar portion 27 that covers the shaft portion 26, and Consists of. Therefore, the strength of the engaging convex portion 25 can be ensured by the shaft portion 26. Further, the engagement protrusion 25 can be smoothly engaged with the engagement recess 42 by the collar portion 27. Therefore, the roller support portion 40 can smoothly rotate with respect to the rotor body portion 20 with a simple configuration. Therefore, wear of the engaging convex portion 25 and the engaging concave portion 42 can be suppressed. In the above-described embodiment, the case where the collar portion 27 of the engagement convex portion 25 is configured by a cylindrical body that is slidably supported with respect to the shaft portion 26 has been described. The collar portion may be configured by an outer ring (made of metal) of a rolling bearing.

  Further, in the tube pump 1 of the first embodiment, the urging means is the compression coil spring 60, and the rotor body 20 has a spring accommodating recess 28 that accommodates the compression coil spring 60. Therefore, by using the compression coil spring 60 that is a general-purpose component, the urging means can be configured easily and inexpensively. Further, by providing the spring accommodating recess 28, the space for arranging the compression coil spring 60 can be easily secured, and the length of the rotor body 20 in the urging direction P2 (or P3) can be shortened. it can.

  Next, another embodiment of the present invention will be described. The other embodiments will be described mainly with respect to differences from the first embodiment, and the same configurations as those of the first embodiment will be denoted by the same reference numerals and detailed description thereof will be omitted. For the points not specifically described in other embodiments, the description of the first embodiment is appropriately applied or incorporated.

[Second Embodiment]
Next, a tube pump 1A according to a second embodiment of the present invention will be described with reference to FIGS. FIG. 7 is a perspective view showing the rotor portion 5A of the tube pump 1A according to the second embodiment of the present invention. 8 is a cross-sectional view taken along line CC shown in FIG. 9 is a cross-sectional view taken along line DD shown in FIG.

  As shown in FIGS. 7 to 9, the tube pump 1A according to the second embodiment is configured as a rotor main body 20A in the rotor portion 5A as compared with the tube pump 1 according to the first embodiment (see FIGS. 2 to 4). Is different. Specifically, the main difference is that the rotor body portion 20A does not have the top plate portion 21 (see FIG. 2) and the engagement convex portion 25A is provided integrally with the connecting portion 23.

  As shown in FIGS. 7 and 8, the engaging convex portion 25 </ b> A has the same extending direction and protruding direction as the engaging convex portion 25 of the tube pump 1 of the first embodiment. The engaging convex portion 25A is provided integrally with the rotor main body portion 20A (connecting portion 23). That is, the engaging convex portion 25 </ b> A is integrally formed with the connecting portion 23 and the bottom plate portion 22. Accordingly, the engagement recess 42 is slidably engaged with the engagement protrusion 25A. Since the other configuration and basic operation of the tube pump 1A of the second embodiment are the same as those of the tube pump 1 of the first embodiment, a duplicate description is omitted.

  According to the tube pump 1A of the second embodiment described above, the same effects as the tube pump 1 of the first embodiment are exhibited, and the following effects are also achieved. In the tube pump 1A of the second embodiment, the rotor main body 20A has an engaging convex portion 25A provided integrally with the rotor main body 20A. Therefore, the number of parts and the number of assembling steps can be reduced by integrally forming the engaging convex portion 25A in the rotor main body portion 20.

  As mentioned above, although one Embodiment of this invention was described, this invention is not restrict | limited to embodiment mentioned above, It can change suitably. In the said 1st Embodiment and the said 2nd Embodiment, although the rotor main-body part 20 and the roller support part 40 were demonstrated as what is integrally molded with an engineering plastic, it is not restrict | limited to this. For example, only the rotor body 20 may be integrally formed of engineering plastic. Further, if the conditions such as predetermined heat resistance, strength, and flexural modulus are satisfied, the rotor body 20 and the roller support 40 or the rotor body 20 are integrally molded with a resin other than engineering plastic. Also good.

  Moreover, in the said 1st Embodiment and the said 2nd Embodiment, although the press roller 50 demonstrated as what was provided along the urging | biasing direction P2 in the rotor parts 5 and 5A, it is not restrict | limited to this. For example, three or more pressing rollers 50 may be provided in the rotor portions 5 and 5A. Moreover, you may increase the number of the tube guide rollers 47 as needed.

DESCRIPTION OF SYMBOLS 1,1A Tube pump 2 Casing 2a Inner peripheral wall surface 3 Tube 4 Drive motor 4a Drive shaft 20, 20A Rotor main body part 25, 25A Engagement convex part 26 Shaft part 27 Collar part 28 Spring accommodating concave part 40 Roller support part 42 Engagement concave part 50 Pressing roller 60 Compression coil spring (biasing means)

Claims (5)

A casing having an inner circumferential wall surface in the shape of an arc, and a tube in which a liquid flows is disposed along the inner circumferential wall surface;
A drive motor having a drive shaft capable of rotating forward and reverse;
A rotor body that rotates together with the drive shaft at a center position of the arc;
A roller support that is engaged with the rotor main body so as to be movable in a direction away from or close to the drive shaft in a plane perpendicular to the drive shaft, and is rotatably engaged with the rotor main body; ,
A pressure roller that is rotatably supported by the roller support portion and presses the tube against the inner peripheral wall surface;
It is disposed between the rotor main body and the roller support, and urges the roller support in a direction away from the drive shaft, and returns the rotated roller support to the position before the rotation. Energizing means for energizing
With
The rotor main body has a pair of engaging projections that extend in a direction in which the drive shaft extends and are provided on both sides in a direction in which the drive shaft extends and a direction that intersects the urging direction by the urging means. ,
The tube support has a pair of engaging recesses that extend in a direction in which the drive shaft extends and engage with the engaging projections to form a rotation fulcrum of the roller support.   The tube pump according to claim 1, wherein the rotor main body and the roller support, or the rotor main body is made of a predetermined resin.   3. The tube pump according to claim 1, wherein the engagement convex portion includes a metal shaft portion fixed to the rotor main body portion and a resin collar portion that covers the shaft portion.   The tube pump according to claim 1, wherein the engagement convex portion is provided integrally with the rotor main body portion. The biasing means is a compression coil spring;
The tube pump according to any one of claims 1 to 4, wherein the rotor main body has a spring accommodating recess that is recessed toward the drive shaft and that accommodates the compression coil spring.

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