JP2011102574A - Tube pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a long-life tube pump which hardly damages a tube or the like. <P>SOLUTION: The tube pump includes a rotor which has rollers and holds the rollers so as to be revolved along the inner peripheral surface of a cap. The rotor comprises a disk for holding the rollers at the base side. A tube holder which is engaged with the disk so as not to be moved further to the base side than the disk, covers a gap between the inner peripheral surface of the cap and itself, and can be rotated along the outer peripheral part of the disk is attached to the outer peripheral part of the disk. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a tube pump that moves a roller that compresses a tube along the tube and transports liquid inside the tube by a peristaltic motion of the tube.

  As a device that transports a relatively small amount of liquid, a tube that moves a roller that presses the tube along the tube and transports the liquid inside the tube by a peristaltic motion of the tube, such as that described in Patent Document 1. Pumps are widely used.

US Patent No. 5,356,267

  FIG. 10 shows a side sectional view of a tube pump having a conventional configuration. As shown in FIG. 10, the tube pump 201 includes a drive motor 210, a gear box 220, and a pump body 300. A rotation shaft 211 of the drive motor 210 is connected to the gear box 220. The gear box 220 transmits the rotational movement of the rotary shaft 211 to the output shaft 221 of the gear box 220 while decelerating.

  The pump main body 300 includes a cap 310, a rotor 320, and a base 340. The cap 310 has a substantially cylindrical inner peripheral surface 311. The tube 360 of the tube pump 201 is disposed along the inner peripheral surface 311 of the cap 310.

  The rotor 320 includes a rotor main body 321, a roller 322, and a roller presser 323. The rotor main body 321 has a disk portion 321g and a main support shaft 321f extending from the approximate center of the disk portion 321g toward the cap 310. The roller presser 323 is a substantially disk-shaped member disposed on the cap 310 side with respect to the rotor body 321, and the roller 322 is sandwiched and held between the rotor body 321 and the roller presser 323. The rotor 320 is rotatably supported with respect to the cap 310, and the roller 322 revolves along the inner peripheral surface 311 of the cap 310 by rotating the rotor 320. When the rotor 320 rotates, the tube 360 is crushed between the roller 322 and the inner peripheral surface 311 of the cap 310 to perform a peristaltic motion, and the liquid in the tube 360 is transported.

  The base 340 is fixed to the gear box 220 by bolts (not shown). The cap 310 is detachably attached to the base 340. When the cap 310 containing the tube 360 and the rotor 320 is attached to the base 340, the output shaft of the gear box 220 is engaged with the rotor body 321, and the drive motor 210 can be driven to rotate the rotor 320. .

  In the tube pump 201 having the conventional configuration shown in FIG. 10, a protrusion 341 that protrudes toward the cap 310 is formed on the base 340. The protruding portion 341 is provided so as to block between the roller 322 and the inner peripheral surface 311 of the cap 310, so that the tube 360 does not come off the roller 322 even if the tube 360 moves to the base 340 side. .

  In the tube pump having the conventional configuration, the base 340 is provided with the protruding portion 341 which is a mechanism for preventing the tube 360 from popping out as described above. Since the protruding portion 341 is inserted between the roller 322 and the inner peripheral surface 311 of the cap 310, the roller 322 and the inner peripheral surface 311 of the cap 310 can be secured to secure the rigidity of the protruding portion 341. It was necessary to increase the interval. That is, the tube pump of the conventional configuration inevitably increases the size of the tube pump when it is attempted to suppress the pop-out of the tube, and it is difficult to reduce the size of the tube pump.

  Further, in the tube pump 201 of the conventional configuration, when the tube 360 hits the protruding portion 341, a force in the direction of separating the cap 310 from the base 340 is generated, and this force causes the cap 310, particularly the cap 310 to engage the base 340. The nail | claw 314 for making it may be damaged.

  The present invention has been made to solve the above problems. That is, a first object of the present invention is to provide a small tube pump that is less likely to break the cap.

  Further, the tube pump 201 having the conventional configuration shown in FIG. 10 is configured such that a high torque is applied to the main support shaft 321f. Therefore, the diameter of the main support shaft 321f is set large. For this reason, if it is going to make the dimension of the tube pump 201 small, the diameter of the roller 322 must be made small. When the diameter of the roller 322 is small, the contact area between the roller 322 and the tube 360 is small. As a result, a concentrated load is applied to the tube 360, and fatigue of the tube occurs in a relatively short period of time.

  The present invention has been made to solve the above problems. That is, a second object of the present invention is to provide a small tube pump that can increase the diameter of a roller that presses the tube.

  Furthermore, the tube pump 201 having the conventional configuration shown in FIG. 10 is configured to fix the output shaft 221 of the gear box 220 in the engagement hole 321e formed in the disk portion 321g of the rotor body 321. In order to allow high torque to be transmitted from the output shaft 221 to the rotor body 321, the cross-sectional shapes of the output shaft 221 and the engagement hole 321 e are non-circular. For this reason, when the output shaft of the gearbox is attached to the rotor, it is necessary to align the positions so that the output shaft 221 can be accommodated in the engagement hole 321e. In order to perform such position alignment efficiently, it is preferable that the gear box 220 can be aligned with the rotor body 321 separated to some extent. That is, it is preferable that the length direction dimension of the output shaft 221 and the engagement hole 321e is sufficiently large. When the size of the tube pump can be increased, the lengthwise dimension of the output shaft 221 and the engagement hole can be increased. However, in the small tube pump, the lengthwise dimension of the output shaft 221 and the engagement hole 321e cannot be increased. Therefore, in the small tube pump 201 shown in FIG. 10, in order to fit the output shaft 221 into the engagement hole 321e, the output shaft 221 and the rotor body 321 are aligned with the cap 310 close to the base 340. There was a need. Since such a rubbing operation is not easy, the conventional tube pump takes time for the assembly process.

  The present invention has been made to solve the above problems. That is, a third object of the present invention is to provide a small tube pump capable of connecting a drive unit composed of a drive motor, a gear box, and the like and a rotor by a simple operation.

  In addition, in the tube pump of the conventional configuration, a radially outward load is applied to the cap due to the tube compression by the rotor, and the cap, which is a resin member, is deformed by this load, and in some cases due to fatigue, a relatively short period of time There was also a possibility of damage.

  The present invention has been made to solve the above problems. That is, a fourth object of the present invention is to provide a tube pump capable of preventing the cap from being damaged due to the use of the tube pump.

  In order to achieve the first object, the tube pump of the present invention has a roller having a roller and holding the roller so as to revolve along the inner peripheral surface of the cap, and the rotor is based on the roller. A disc portion that is held on the side, and the outer peripheral portion of the disc portion is engaged with the disc portion so as not to move to the base side than the disc portion, covers a gap with the inner peripheral surface of the cap, and A tube retainer that is rotatable along the outer periphery of the disk portion is provided.

  According to the above configuration, since the tube is prevented from popping out by the tube presser attached to the rotor, there is no need to provide a mechanism for preventing the tube from popping out on the base. For this reason, a small tube pump is realized. Further, when the tube comes into contact with the tube retainer, the tube retainer becomes stationary due to the frictional force acting between the tube and the tube retainer. For this reason, even if the rotor rotates, the tube is not dragged by the tube presser, and the load applied to the tube and the tube presser is small. In a configuration in which the tube itself is prevented from popping out by the rotor itself, there is a possibility that the tube will be dragged against the rotor when the tube abuts on the rotor, and the tube may be damaged, but according to the present invention, the tube is not dragged. Therefore, the lifetime of the tube is long.

  In order to achieve the second object described above, the tube pump of the present invention has a roller and a rotor that holds the roller so that it can revolve along the inner peripheral surface of the cap. There is a disk part that holds the roller on the base side, and a roller presser that holds the roller between the disk part. In the center of the disk part, it extends toward the roller presser, and the tip part is the roller presser A main support shaft that abuts on the main support shaft is formed, and a rib is formed between the disk portion and the main support shaft.

  According to the tube pump having the above-described configuration, the main support shaft is reinforced by the rib. Therefore, even with a small tube pump, the diameter of the main support shaft can be reduced and the diameter of the roller can be increased.

  In order to achieve the third object, the tube pump of the present invention has a roller and a rotor that holds the roller so that it can revolve along the inner peripheral surface of the cap. A base to which the cap is attached, a drive unit that is fixed to the base and rotates the rotor so as to revolve the roller, and a connecting shaft that transmits the rotational motion of the output shaft of the drive unit to the rotor. Has a disk part for holding the roller on the base side, and a roller presser for holding the roller between the disk part. A main support shaft that contacts the roller presser is formed, and a positioning shaft portion having a non-circular cross section is formed at the end of the connecting shaft on the rotor side. The unit side portion is formed with an engagement shaft portion having a non-circular cross section that is larger in diameter than the positioning shaft portion, and the main support shaft is formed with a positioning hole portion that can be engaged with the positioning shaft portion. The disk portion is formed with an engagement hole that can be engaged with the engagement shaft portion.

  According to the tube pump configured as described above, the drive unit can be moved only by moving the cap toward the base from the state where the positioning shaft portion of the connecting shaft and the positioning hole portion provided in the main support shaft are engaged. It can be connected to the rotor. Further, the engagement between the positioning shaft portion and the positioning hole portion can be performed in a state where the cap is separated from the base. For this reason, according to this invention, even if it is a small tube pump, it becomes possible to connect a drive unit and a rotor by an easy operation | work.

  In order to achieve the fourth object, in the tube pump of the present invention, a claw protruding outward in the radial direction is formed on a part of the outer peripheral surface of the cap, and the cap accommodates the base. The base is formed with a claw that engages with the claw of the cap and holds the cap so that the cap does not come off from the base. The cap is reinforced from the outside in the radial direction by the claw of the base.

  With such a configuration, since the cap is reinforced by the claw of the base, deformation of the cap that may occur due to the compression of the tube by the rotor is prevented.

  As described above, according to the present invention, a long-life tube pump in which a tube or the like is not easily damaged, a tube pump capable of increasing the diameter of a roller, and a drive unit and a rotor are connected by a simple operation. A tube pump capable of achieving this is realized.

FIG. 1 is a front view of the tube pump of the present embodiment. FIG. 2 is a side sectional view of the tube pump of the present embodiment. FIG. 3 is an exploded view of the tube pump of the present embodiment. FIG. 4 is a perspective view of the connecting shaft of the tube pump of the present embodiment. FIG. 5 is a front view of the connecting shaft of the tube pump of the present embodiment. FIG. 6 is a rear view of the rotor main body of the tube pump of the present embodiment. FIG. 7 is a perspective view of the rotor main body of the tube pump of the present embodiment. FIG. 8 is a side sectional view of a tube pump of another example of the present embodiment. FIG. 9 is a side sectional view of another example of the tube pump according to the present embodiment. FIG. 10 is a side sectional view of a tube pump having a conventional configuration.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG.1 and FIG.2 is the front view and side sectional drawing of the tube pump of this embodiment, respectively. FIG. 3 is an exploded view of the tube pump of the present embodiment. As shown in FIGS. 2 and 3, the tube pump 1 of this embodiment includes a drive motor 10, a gear box 20, and a pump body 100.

  In the following description, the side where the pump body 100 is present (the front side of the drawing in FIG. 1, the left side in FIG. 2, the lower left side in FIG. 3) is the “front side”, and the side where the drive motor 10 is present (FIG. 1). In FIG. 2, the rear side of the drawing, the right side in FIG. 2, and the upper right side in FIG. Further, the direction from the near side to the far side and the direction from the far side to the near side are defined as the depth direction.

  The pump body 100 includes a cap 110, a rotor 120, a tube pressing ring 130 (FIGS. 2 and 3), a base 140, a fixing plate 150, and a plate holding cylinder 170.

  As shown in FIGS. 2 and 3, the fixing plate 150 is sandwiched and held between the base 140 and the plate holding cylinder 170. That is, by fixing the plate holding cylinder 170 to the base 140, the fixing plate 150 is fixed to the base 140. As shown in FIGS. 1 and 3, the fixing plate 150 is provided with a pair of through holes 151. When the tube pump 1 is fixed to a frame or the like of an apparatus using the tube pump 1, the fixing plate 150 is fastened to the frame or the like through a bolt through the through hole 151.

  As described above, in the present embodiment, the fixing plate 150 for fixing the tube pump 1 is removable. For this reason, the tube pump 1 can be attached to various devices by using the fixing plate 150 having an appropriate shape according to the shape of the frame or the like to which the tube pump 1 is attached.

  As shown in FIGS. 1 and 2, the inner peripheral surface 111 of the cap 110 is formed in a substantially cylindrical surface, and the tube 160 is disposed along the inner peripheral surface 111 of the cap 110 (that is, The major axis direction of the tube 160 is a direction substantially along the circumferential direction of the inner peripheral surface 111). As shown in FIG. 1, the cap 110 is provided with a first opening 112 a and a second opening 112 b on the lower side thereof, and the first end 161 and the second end 162 of the tube 160 are respectively connected to the cap 110. It protrudes from the outside of the cap 110 through the first opening 112a and the second opening 112b.

  As shown in FIG. 3, the rotor 120 includes a rotor main body 121, three sets of rollers 122 and a rotor presser 123. Further, as shown in FIG. 2, in the cap 110, a rotor support shaft 114 extending from the near side to the far side is formed at the center of the ceiling portion 113 located on the near side. Engagement holes 121 a and 123 a into which the rotor support shaft 114 is inserted are formed in the rotor body 121 and the rotor retainer 123, and the rotor body 121 and the rotor retainer 123 are rotatably supported by the rotor support shaft 114.

  The rotor main body 121 includes a disk part 121g and three roller support shafts 121b extending from the front surface of the disk part 121g to the front side. The roller support shaft 121b is formed on a circumference centered on the engagement hole 121a. Note that the engagement hole 121a of the rotor body 121 is formed in the main support shaft 121f extending from the approximate center of the front surface of the disk portion 121g toward the front side. The roller 122 has a cylindrical shape, and a hole 122c extending toward the other end surface 122b (front side) is formed in the center of one end surface (back side) 122a. The diameter of the hole 122c is large enough to slidably accommodate the roller support shaft 121b of the rotor body 121. Furthermore, a cylindrical protrusion 122 d is formed on the end surface 122 b of the roller 122. Further, on the end surface 123b on the back side of the rotor presser 123, three concave portions 123c that can slidably accommodate the protruding portions 122d of the respective rollers 122 are formed on a circumference centering on the engagement hole 123a. Yes.

  The roller support shaft 121b of the rotor main body 121 is inserted into the hole 122c of the roller 122, the protrusion 122d of the roller 122 is accommodated in the concave portion 123c of the rotor press 123, and the engagement holes 123a and 121a of the rotor press 123 and the rotor main body are further formed. By inserting the cap 110 into the rotor support shaft 114, the entire rotor 120 can rotate around the rotor support shaft 112, and each of the rollers 122 can rotate around the roller support shaft 121 b of the rotor body 121. At this time, the main support shaft 121 f of the rotor body 121 abuts on the rotor presser 123.

  As shown in FIGS. 1 and 2, the tube 160 is squeezed between the roller 122 and the inner peripheral surface of the cap 110, and when the rotor 120 rotates around the rotor support shaft 114 of the cap 110. The roller 122 revolves along the inner peripheral surface 111 of the cap 110 while crushing the tube 160. As a result, the tube 160 causes a peristaltic motion, and the contents of the tube 160 move. For example, when the rotor 120 is rotated clockwise in FIG. 1, the contents of the tube 160 are at the lower right in FIG. 1 from the first end 161 protruding from the first opening 112 a at the lower left in FIG. 1. It is sent out toward the second end 162 protruding from the second opening 112b. Thus, by driving the rotor 120, the contents of the tube 160 can be sent out.

  The cap 110 is fixed to the base 140. When the cap 110 is fixed to the base 140, the rotor 120 is sandwiched and held between the cap 110 and the base 140.

  As shown in FIG. 2, a tube pressing ring 130 having a slightly larger diameter than the rotor main body 121 is disposed outside the rotor main body 121 in the radial direction. A step 132 is formed on the inner peripheral surface 131 which is a cylindrical surface of the tube pressing ring 130 so that the front side is a small diameter portion 132a and the back side is a large diameter portion 132b. A step 121d is formed on the outer peripheral surface 121c, which is a cylindrical surface of the rotor body 121, such that the front side is the small diameter portion 121d1 and the back side is the large diameter portion 121d2. The diameter of the small diameter portion 132a of the tube retaining ring 130 is slightly larger than the diameter of the small diameter portion 121d1 of the rotor main body 121 and smaller than the diameter of the large diameter portion 121d2. Further, the diameter of the large diameter portion 132b of the tube pressing ring 130 is slightly larger than the diameter of the large diameter portion 121d2 of the rotor main body 121. For this reason, in a state in which the tube pressing ring 130 is attached to the rotor main body 121, the step 121 d of the rotor main body 121 and the step 132 b of the tube pressing ring 130 are engaged, and the tube pressing ring 130 is located deeper than the rotor main body 121. The tube holding ring 130 is configured to be movable while sliding with respect to the rotor body 121. The center of the outer peripheral surface 121 c of the rotor main body 121 and the inner peripheral surface 131 of the tube pressing ring 130 with the cap 110 and the tube pressing ring 130 attached to the rotor main body 121 is the center of the rotor support shaft 114 of the cap 110. It almost coincides with the axis.

  As shown in FIG. 2, the tube pressing ring 130 is disposed so as to close a gap between the roller 122 of the rotor 120 and the inner peripheral surface 111 of the case 110. Thereby, during the operation of the tube pump 1, the tube 160 does not jump out of the gap between the roller 122 and the inner peripheral surface 111 of the case 110 even if the tube 160 moves to the back side.

  In addition, the tube pump 1 does not have the tube pressing ring 130, and instead the disk portion 121 g of the rotor body 121 is sized so as to block the gap between the roller 122 and the inner peripheral surface 111 of the case 110. In the configuration, when the tube 160 moves to the back side and comes into contact with the disk portion 121g of the rotor body 121, the tube 160 is dragged in the revolution direction of the roller 122 by the friction force acting on the tube 160 and the disk portion 121g, and the tube is damaged. there's a possibility that.

  On the other hand, in the tube pump 1 according to the present embodiment, the tube pressing ring 130 that is rotatable with respect to the disk portion 121g of the rotor main body 121 has a gap between the roller 122 of the tube 160 and the inner peripheral surface 111 of the case 110. Prevents jumping out from. In such a configuration, when the tube 160 moves to the back side and comes into contact with the tube pressing ring 130, the tube pressing ring 130 is moved by the frictional force acting between the tube 160 and the tube pressing ring 130. The rotation of the rotor 120 prevents the tube 160 from being dragged in the revolving direction of the roller 122 and being damaged.

  Further, the tube pump 1 according to the present embodiment is configured such that the gap between the roller 122 of the rotor 120 and the inner peripheral surface 111 of the case 110 is closed by the tube pressing ring 130 attached to the rotor body 121 as described above. Therefore, the rotor main body 121, the roller 122, and the rotor retainer 123 to which the tube retainer ring 130 is attached are combined to form the rotor 120, the tube 160 is disposed around the roller 122 of the rotor 120, and then the rotor 120 and the tube retainer are disposed. The tube 160 can be incorporated into the tube pump 1 by a simple operation of pushing the tube 160 together with the ring 130 into the cap 110.

  Next, a mechanism for attaching the cap 110 to the base 140 will be described. As shown in FIGS. 1 to 3, four sets of claws 115 projecting radially outward in the form of flanges are formed at equal intervals (that is, every 90 °) at the back end of the outer peripheral cylindrical surface 116 of the cap 110. ) Is formed. In addition, the base 140 is formed with a concave portion 141 that accommodates the back portion of the cap 110 and the claw 115, and protrudes inward in the radial direction at the front end portion of the inner peripheral cylindrical surface 142 of the concave portion 141. Four sets of claws 143 are formed at equal intervals (that is, every 90 °). The distal ends in the radial direction of the four claws 115 of the cap 110 are arranged on a circumference concentric with the outer peripheral cylindrical surface 116 of the cap 110, and the diameter of the circumference is the diameter of the inner peripheral cylindrical surface 142 of the base 140. The size is slightly smaller than that. Further, the distal ends in the radial direction of the four pairs of claws 143 of the base 140 are arranged on a circumference concentric with the inner circumferential cylindrical surface 142 of the base 140, and the diameter of the circumference is the outer circumferential cylindrical surface of the cap 110. The diameter of the cap 110 is smaller than the diameter of the circumference where the four sets of claws 115 are located. Further, the circumferential dimension of the claw 115 of the cap 110 is the circumferential distance of the claw 143 of the base 140 (that is, the circumferential length of each of the four sets of the inner circumferential cylindrical surface 142 where the claw 143 is not provided. Is sufficiently smaller than

  The cap 110 is inserted into the recess 141 of the base 140 so that the claw 115 does not interfere with the claw 143 of the base 140, and then the cap 110 is rotated about the rotor support shaft 114 clockwise in FIG. Is moved to a position aligned with the claw 143 of the base 140 in the depth direction. 1 and 2, when the claw 115 of the cap 110 is aligned with the claw 143 of the base 140 in the depth direction, the claw 115 of the cap 110 and the claw 143 of the base 140 are engaged with each other. Even if the cap 110 is pulled toward the front side, the cap 110 does not come off the base 140.

  Further, the tube pump 1 is in a state where the tube 160 is pressed against the inner peripheral surface 111 of the cap 110 by the rotor 120, and a load radially outward is always applied to the cap 110. In the present embodiment, as described above, when the cap 110 is attached to the base 140, the claw 143 of the base 140 is in contact with the outer peripheral cylindrical surface 116 of the cap 110. For this reason, the nail | claw 143 becomes a form which reinforces the cap 110 from the radial direction outer side, and the deformation | transformation of the cap 110 by the said radial direction outward load is relieved.

  In addition, a pin-shaped locking projection 117 that protrudes outward in the radial direction and extends in the depth direction is provided on a portion of the outer peripheral cylindrical surface 116 of the cap 110 located on the near side of the claw 115 (FIGS. 1 and 2). 3). Further, the claw 143 of the base 140 is formed with a locking recess 144 that is recessed outward in the radial direction. Further, one end in the circumferential direction of the claw 143 of the base 140 (counterclockwise side in FIG. 1) is formed with an inclined surface 145 that approaches the inner peripheral cylindrical surface 142 of the base 140 toward the counterclockwise direction. Yes. Accordingly, when the cap 110 is inserted into the concave portion 141 of the base 140 and then the cap 110 is rotated in the clockwise direction in FIG. 1, the locking protrusion 117 of the cap 110 moves along the inclined surface 145 of the claw 143 of the base 140. Finally, it is accommodated in the locking recess 144. In a state in which the locking projection 117 is accommodated in the locking recess 144, the engagement between the locking projection 117 and the locking recess 144 cannot be removed unless the cap 110 is rotated counterclockwise with a strong force. That is, the cap 110 is locked with respect to the base 140 by meshing the locking protrusion 117 and the locking recess 144.

  Thus, in the present embodiment, the cap 110 is locked to the base 140 by the locking protrusion 117 provided on the outer peripheral cylindrical surface 116 of the cap 110. In a conventional configuration in which a locking projection or locking recess is formed on the claw, which is a part of the cap with low rigidity, a large load is applied to the claw when the cap is locked, and the claw may be damaged. However, in the configuration of the present embodiment, since the locking projection 117 is provided on the outer cylindrical surface 116 having relatively high rigidity, the cap 110 is not easily damaged when the cap 110 is locked.

  A stopper portion 146 having a small diameter is formed on a portion of the inner peripheral cylindrical surface 142 of the base 140 located on the other end in the circumferential direction of the claw 143 (counterclockwise in FIG. 1) (FIG. 1, FIG. 1). FIG. 3). When the cap 110 is further rotated in the clockwise direction in FIG. 1 from the state in which the locking projection 117 is accommodated in the locking recess 144 shown in FIG. 1, for example, the locking projection 117 and the locking recess 144. Even if the meshing is released, the claw 115 of the cap 110 does not interfere with the stopper portion 146, and the cap 110 does not move further in the clockwise direction. In other words, the stopper portion 146 functions as a stopper for preventing the cap 110 from moving in the clockwise direction in FIG. 1 from the state in which the locking projection 117 is accommodated in the locking recess 144.

  In the present embodiment, the cap 110 is provided with the locking projection 117 and the base 140 is provided with the locking recess, but the locking recess recessed inward in the radial direction of the cap 110 is the cap 110. The base 140 may be provided with a locking protrusion provided on the base 140 and protruding inward in the radial direction of the base 140.

  Next, a mechanism for rotating the rotor 120 of the pump body 100 will be described. As shown in FIG. 2, the rotating shaft 11 of the drive motor 10 is connected to the gear box 20. The gear box 20 transmits the rotational movement of the rotary shaft of the drive motor 10 to the output shaft 21 of the gear box 20 while decelerating. The output shaft 21 of the gear box 20 is connected to a connecting shaft 30 for transmitting the rotational motion of the output shaft 20 to the rotor body 121 of the rotor 120.

  A connection mechanism between the connection shaft 30 and the rotor body 121 will be described below. FIG. 4 is a perspective view of the connecting shaft 30. FIG. 5 is a front view of the connecting shaft 30 as viewed from the front side (lower left side in FIG. 4). As shown in FIG. 4, the front end portion of the connecting shaft 30 (that is, the rotor main body 121 side) has a Y-shaped cross section (that is, the arm portion 31a from the central axis 30A of the connecting shaft). , 31b and 31c are formed in a radially extending manner).

  Further, in the connecting shaft 30, an engaging shaft portion 32 is formed at a portion adjacent to the back side of the positioning shaft portion 31. The engagement shaft portion 32 is obtained by cutting a columnar shaft at a position perpendicular to the extending direction of each arm portion at the position of the distal end portion of each arm portion 31a, 31b, 31c of the positioning shaft portion 3 The two flat portions 32a1, 32a2 and 32a3, and the flat portions 32a1 and 32a2, 32a2 and 32a3, and 32a3 and 32a1 have cylindrical surfaces 32b1, 32b2 and 32b3, respectively. ing.

  In this embodiment, the connecting shaft 30 is positioned around the rotor body 121 by the positioning shaft portion 31 disposed on the front side, and the connecting shaft 30 and the rotor body 121 are integrated by the engaging shaft portion 32. To be able to rotate. FIG. 6 shows a rear view of the rotor body 121. As shown in the cross-sectional view of FIG. 2 and the rear view of FIG. 6, the rotor main body 121 has an engagement hole 121 e that engages with the connecting shaft.

  As shown in the sectional view of FIG. 2, the engagement hole 121e is a stepped hole having a positioning hole 121e1 located on the near side and an engagement hole 121e2 located on the far side. The engagement hole portion 121e2 has substantially the same triangular cross-sectional shape as the engagement shaft portion 32 of the connecting shaft 30, and the flat portions 32a1, 32a2, and 32a3 (FIGS. 4 and 5) of the engagement shaft portion 32. The rotor main body 121 and the connecting shaft 30 can be rotated together by the engagement of the engagement hole portion 121e2. On the other hand, the positioning hole 121e1 has substantially the same Y-shaped cross section as the positioning shaft 31 (FIGS. 4 and 5) of the connecting shaft 30, and after the positioning shaft 31 is inserted into the positioning hole 121e1, The engaging shaft portion 32 can be engaged with the engaging hole portion 121e2 only by moving the connecting shaft 30 to the rotor body 121 along the positioning hole portion 121e1.

  After the tube 160 is attached between the cap 110 and the roller 122 (FIGS. 1 and 2), the cap 110, the rotor 120, the tube 160, and the tube are caused by the friction force acting between the cap 110 and the roller 122 and the tube 160. The retaining ring 130 forms an integral pump side unit. When attaching the connecting shaft 30 to this unit, the connecting shaft 30 is first fixed to the output shaft 21 of the gear box 20, and then the base 140 is fixed to the gear box 20 with a bolt (not shown) to form a gear box side unit. . Then, the engaging shaft portion 32 of the connecting shaft 30 is engaged with the engaging hole portion 121 e 2 of the rotor body 121, and finally the cap 110 is fixed to the base 140.

  The positioning of the engagement shaft portion 32 of the connecting shaft 30 and the engagement hole portion 121e2 of the rotor body 121 is such that the cap 110 or the rotor body 121 and the base 140 do not interfere with each other, that is, the cap 110 is separated from the base 140 to some extent. It is preferable to carry out with. If the tube 110 is a large-sized tube pump capable of increasing the depth dimension of the cap 110 and the rotor 120, even if the positioning shaft portion is not provided in the connecting portion, the engagement shaft portion 32 is made long. The cap 110 can be positioned with a certain distance from the base 140 (the engaging shaft portion 32 has a function as a positioning shaft portion). However, in the small tube pump in which the depth direction dimension of the cap 110 and the rotor 120 cannot be increased, in the configuration in which the positioning shaft portion 31 is not provided in the connecting portion 30, the depth direction dimension of the engagement shaft portion 32 is increased. In this case, it is necessary to perform positioning while bringing the engaging shaft portion 32 into contact with the base 121, so that the cap 110 is inevitably close to the base 140. For this reason, interference with the cap 110 or the rotor main body 121 and the base 140 is likely to occur, and the positioning operation of the engagement shaft portion 32 of the connecting shaft 30 and the engagement hole portion 121e2 of the rotor main body 121 is not easy. In contrast, in the present embodiment, since the positioning shaft portion 31 is formed on the connecting shaft 30, the positioning operation of the engaging shaft portion 32 of the connecting shaft 30 and the engaging hole portion 121 e 2 of the rotor main body 121 is performed. Can be easily performed. Further, since the positioning shaft portion 31 does not need to transmit torque from the gear box 20 to the rotor 120, it is not necessary to increase its diameter. Therefore, the main support shaft 121f in which the positioning shaft portion 31 is accommodated can be thinned.

  Next, the shape of the rotor body 121 will be described. FIG. 7 is a perspective view of the rotor body 121 of the present embodiment. In the present embodiment, as shown in FIGS. 1, 2 and 7, three sets of ribs 121h are formed between the main support shaft 121f of the rotor body 121 and the disk portion 121g. Each of the three sets of ribs is disposed between the rollers 122 as shown in FIG.

  Further, an engagement protrusion 121i that protrudes toward the near side is provided on the end surface on the near side of the rib 121h. As shown in FIG. 2, the rotor presser 123 is formed with a through hole 123 d in which the engagement protrusion 121 i is accommodated.

  In a configuration in which the rib 121h is not provided on the rotor body 121, a large torque is applied to the main support shaft 121f. Therefore, it is necessary to make the main support shaft 121f thick so that the main support shaft 121f is not damaged. In the present embodiment, the main support shaft 121f is reinforced by the rib 121h, and further, the rotor presser 123 and the rib 121h are connected via the engagement protrusion 121i. Therefore, even if the main support shaft 121f is thin, The main spindle 121f is not damaged. Since the main support shaft 121f can be made thin, the diameter of the roller support shaft 121b can be increased. In the present embodiment, it is possible to increase the diameter of the roller support shaft 121b as described above. Therefore, in this embodiment, as shown in the sectional view of FIG. 8, the roller 122 can be cantilevered only by the roller support shaft 121b without providing the protrusion 122d on the roller 122. Alternatively, as shown in the cross-sectional view of FIG. 9, the hole 122 c of the roller 122 passes through the roller 122, and the roller support shaft 121 b protrudes from the front end surface 122 b of the roller 122 to the recess 123 c of the rotor presser 123. It is good also as a structure accommodated (that is, the roller support shaft 121b serves as the function of the protrusion part 122d).

  In the present embodiment, since the diameter of the roller 122 can be increased, the contact area between the roller 122 and the tube 160 can be increased, and the load applied to the tube 160 is dispersed. As a result, the elongation of the tube 160 is relatively small, and the tube 160 is not easily broken (that is, the life of the tube 160 can be extended).

  Further, in the configuration of the present embodiment, since the range of the diameter of the usable roller 122 is wide, the roller 122 having an appropriate diameter can be selected according to the thickness, material, thickness, etc. of the tube 160.

DESCRIPTION OF SYMBOLS 1 Tube pump 10 Drive motor 20 Gear box 30 Connection shaft 31 Positioning shaft part 32 Engagement shaft part 100 Pump main body 110 Cap 120 Rotor 121 Rotor main body 121f Main support shaft 121h Rib 122 Roller 123 Rotor press 130 Tube press ring

Claims (16)

A cap having a substantially cylindrical inner peripheral surface;
A tube disposed along the inner peripheral surface of the cap;
A rotor having a roller and holding the roller so as to be revolved along the inner peripheral surface of the cap, and compressing the tube with the roller to transport the contents of the tube by a peristaltic motion of the tube When,
A base to which the cap is attached;
Have
The rotor has a disk portion for holding the roller on the base side;
The outer peripheral portion of the disc portion is engaged with the disc portion so that the tube does not move to the base side than the disc portion, covers the gap with the inner peripheral surface of the cap, and the outer peripheral portion of the disc portion A tube pump characterized in that a tube presser rotatable along the tube is provided. On the outer peripheral surface of the disk part, a step part is formed so that the base side has a large diameter,
2. The tube pump according to claim 1, wherein the tube presser is an annular member in which a stepped portion that engages with a stepped portion of the disk portion is formed on an inner peripheral surface. The rotor has a roller presser that holds the roller between the disk portion and holds the roller,
The cap is formed with a rotor support shaft extending toward the base,
A main support shaft extending toward the roller presser is formed in the approximate center of the disk portion,
The main support shaft of the roller retainer and the disk portion is formed with a bearing hole into which the rotor support shaft is inserted so as to be rotatable around the rotor support shaft. The tube pump according to claim 1 or claim 2. The rotor has a roller presser that holds the roller between the disk portion,
A main support shaft is formed in the approximate center of the disk part, extending toward the roller presser, and a tip part abutting the roller presser,
The tube pump according to any one of claims 1 to 3, wherein a rib is formed between the disk portion and the main support shaft.   The tube pump according to claim 4, wherein the rib includes an engaging portion that engages with the roller presser and transmits a rotational movement of the disk portion to the roller presser. The engaging portion of the rib is a protruding portion that protrudes toward the roller presser,
The tube pump according to claim 5, wherein the roller presser is formed with a hole for accommodating the protruding portion. A hole extending along the axial direction is formed in the center of the roller,
7. A roller support shaft that extends toward the roller press and is accommodated in a hole of the roller so as to rotatably support the roller is formed in the disk portion. The tube pump as described in any one of. The tube pump is
A drive unit that is fixed to the base and rotates the rotor so as to revolve the roller; and a connecting shaft that transmits the rotational movement of the output shaft of the drive unit to the rotor.
The rotor has a roller presser that holds the roller between the disk portion,
A main support shaft is formed in the approximate center of the disk part, extending toward the roller presser, and a tip part abutting the roller presser,
A positioning shaft portion having a non-circular cross section is formed at an end portion of the connecting shaft on the rotor side,
In the connecting shaft, an engagement shaft portion having a non-circular cross section having a diameter larger than that of the positioning shaft portion is formed in a portion closer to the drive unit than the positioning shaft portion.
The main support shaft is formed with a positioning hole that can be engaged with the positioning shaft,
The tube pump according to any one of claims 1 to 7, wherein an engagement hole portion engageable with the engagement shaft portion is formed in the disk portion.   The tube pump according to claim 8, wherein the positioning shaft portion has a Y-shaped cross section extending radially from the central axis of the connecting shaft.   The tube pump according to claim 8 or 9, wherein the engagement shaft portion has a substantially triangular cross-sectional shape. A claw protruding outward in the radial direction is formed on a part of the outer peripheral surface of the cap,
The base is formed with a recess adapted to receive the cap,
The recess of the base is formed with a claw that engages with the claw of the cap and holds the cap so that it does not come off the base.
The tube according to any one of claims 1 to 10, wherein the claw of the base abuts on an outer peripheral surface of the cap, and the cap is reinforced from the outside in the radial direction by the claw of the base. pump.   Either one of the outer peripheral surface of the cap with which the claw of the base abuts and the claw of the base is provided with a locking projection, and the other is engaged with the locking projection. The tube pump according to claim 11, wherein a stop recess is provided.   The tube pump according to claim 12, wherein the locking protrusion is formed in a pin shape extending along an axial direction of the cap. A cap having a substantially cylindrical inner peripheral surface;
A tube disposed along the inner peripheral surface of the cap;
A rotor having a roller and holding the roller so as to be revolved along the inner peripheral surface of the cap, and compressing the tube with the roller to transport the contents of the tube by a peristaltic motion of the tube When,
A base to which the cap is attached;
Have
The rotor has a disk part that holds the roller on the base side, and a roller press that holds the roller between the disk part,
A main support shaft is formed in the approximate center of the disk part, extending toward the roller presser, and a tip part abutting the roller presser,
A tube pump, wherein a rib is formed between the disk portion and the main support shaft. A cap having a substantially cylindrical inner peripheral surface;
A tube disposed along the inner peripheral surface of the cap;
A rotor having a roller and holding the roller so as to be revolved along the inner peripheral surface of the cap, and compressing the tube with the roller to transport the contents of the tube by a peristaltic motion of the tube When,
A base to which the cap is attached;
A drive unit that is fixed to the base and rotates the rotor so as to revolve the roller; and a connecting shaft that transmits the rotational movement of the output shaft of the drive unit to the rotor.
The rotor has a disk part that holds the roller on the base side, and a roller press that holds the roller between the disk part,
A main support shaft is formed in the approximate center of the disk part, extending toward the roller presser, and a tip part abutting the roller presser,
A positioning shaft portion having a non-circular cross section is formed at an end portion of the connecting shaft on the rotor side,
In the connecting shaft, an engagement shaft portion having a non-circular cross section having a diameter larger than that of the positioning shaft portion is formed in a portion closer to the drive unit than the positioning shaft portion.
The main support shaft is formed with a positioning hole that can be engaged with the positioning shaft,
The tube pump according to claim 1, wherein an engagement hole portion that can be engaged with the engagement shaft portion is formed in the disk portion. A cap having a substantially cylindrical outer peripheral surface and an inner peripheral surface;
A tube disposed along the inner peripheral surface of the cap;
A rotor having a roller and holding the roller so as to be revolved along the inner peripheral surface of the cap, and compressing the tube with the roller to transport the contents of the tube by a peristaltic motion of the tube When,
A base to which the cap is attached;
Have
A claw protruding outward in the radial direction is formed on a part of the outer peripheral surface of the cap,
The base is formed with a recess adapted to receive the cap,
The recess of the base is formed with a claw that engages with the claw of the cap and holds the cap so that it does not come off the base.
The tube pump according to claim 1, wherein the claw of the base is in contact with the outer peripheral surface of the cap, and the cap is reinforced from the outside in the radial direction by the claw of the base.

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