JPH0318712Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to the improvement of a roller pump. Specifically, a tube arranged along the guide surface of a tube receiver is pressed and held by a pressure roller, and this pressure This invention relates to a roller pump that sucks and discharges fluid in a tube by rotating a roller.

[Background technology and its problems]

Roller pumps are used in a wide range of fields such as research, analysis, inspection and manufacturing, but in general, it is especially desirable that the amount of fluid transported in the tube, that is, the amount of discharge, can be precisely controlled. be.

The structure of a conventional roller pump is shown in detail in FIGS. 5 and 6. In these figures, a round hole 2 is drilled in the center of a flat board 1, penetrating the top and bottom surfaces, and a substantially circular tubular fixed guide 3 is fitted into this round hole 2 with a very small gap. ing. At this time, female threaded portions 1 are provided on both sides of the board 1.
A is provided from the outside of the substrate 1 toward the axial center of the round hole 2 so as to be orthogonal to the axial direction. On both sides of the fixed guide 3 in the drawing, that is, at approximately the center of both left and right sides in the drawing, window portions 3B are formed by cutting out along the circumferential direction within a predetermined range. Further, an output shaft 4 of a motor (not shown) is inserted from the lower side of the round hole 2, a lower end of a drive shaft 5 is attached to the tip of the output shaft 4, and a lower end of the drive shaft 5 is attached to the upper end of the drive shaft 5. A cap 19 is attached.

A plurality of pressure rollers 8 are arranged on the circumferential surface of the drive shaft 5 so as to be rotatable on the circumferential surface. These pressing rollers 8 are provided with a substantially ring-shaped retainer 9.
As a result, they are held at equal intervals along the circumferential direction of the drive shaft 5, and each is rotatably held.

An adjusting screw 29 is screwed into the female threaded portion 1A of the substrate 1, and its tip is brought into contact with the lower outer periphery of the fixed guide 3. By increasing the screwing amount of the adjusting screw 29, this fixed guide A pressing force is applied to the lower outer circumference of the fixed guide 3.
is deformed in the radial direction of the drive shaft 5 within elastic limits.

Two tube receivers 11 are rotatably attached to the rear end position of the upper surface of the substrate 1, that is, the upper end side in FIG. 5, via respective spindle screws 12. That is, the two tube receivers 11 can be opened and closed relative to each other using the support shaft screw 12 as a fulcrum. An arcuate guide surface 15 centered on the axis of the drive shaft 5 is cut out on the opposing side surfaces of the tube receiver 11 . The dimension of this guide surface 15 along the axial direction of the drive shaft 5 is:
It is formed to have the same width as the window portion 3B. Further, the guide surface 15 has a perfect circular shape with a diameter larger than the inner diameter and smaller than the outer diameter of the fixed guide 3, and a contact edge 15A having an angular cross section is provided on the upper edge of the guide surface 15 in the circumferential direction. It is formed along the Here, the main body includes the substrate 1, the fixed guide 3, and the tube receiver 11.

Further, a butterfly bolt 13 is inserted into the rotation end side of the tube support 11 along the rotation direction of the tube support 11, and the butterfly bolt 13 is attached to a mounting screw fixed to the front position of the upper surface of the board 1. 14 from the radial direction, and when the butterfly bolt 13 is screwed into the mounting screw 14, the two tube receivers 11 are in a state where they sandwich the fixed guide 3 from both sides.
In addition, in a state where the contact edge 15A is in contact with the fixed guide 3, the tube receiver 11 is fixed by the butterfly bolt 13, and in this state, the window portion 3B of the fixed guide 3 is in contact with the guide surface 15. It has become almost completely occluded. However, a predetermined interval is provided between both edges along the guide surface 15 and the fixed guide 3, and the tube 16 is inserted into this interval. Here, the wing bolt 13 and the mounting screw 14 constitute a locking means.

The supply end side of the tube 16, that is, the upper end side in FIG. It is held in the groove 17A.

In such a conventional example, the locking means is the wing bolt 13 and the mounting screw 14 as described above, but if the wing bolt 13 or the like is used, the tube receiver 11 may be fixed to the main body due to forgetting to tighten it. The pump may not function as a pump. Furthermore, even if the tube receiver 11 is fixed to the main body with the butterfly bolt 13 or the like,
There is a problem in that the clearance between the guide surface 15 and the pressure roller 8 may vary depending on the tightening of the bolt, resulting in inaccurate discharge amount.

Further, as mentioned above, the conventional holding means has a groove 1.
It consists of one holding plate 17 having a diameter of 7A, and the tube 16 is held in this groove 17A and deformed in one direction to hold it.In order to prevent the tube 16 from being sent, the groove 17A is It was necessary to make the width extremely small compared to the tube diameter, or to provide an edge in the groove. However, reducing the width of the groove or providing an edge in the groove creates an extreme difference in the liquid flow path, causing cavitation, and in some cases, providing an edge may damage the tube. Sometimes. On the other hand, if the width of the groove is increased in order to avoid this inconvenience, the tube 16 will be moved and there will be a problem that stable operation of the pump will not be possible. In particular, medical infusion tubes have limited elasticity due to limitations on the material of the tube due to chemical resistance, etc., and the tube cannot always be held sufficiently, making stable operation of the pump impossible. .

(Purpose of the invention) An object of the invention is to provide a roller pump that can perform accurate suction and discharge operations and can operate stably.

[Means and actions for solving problems]

The present invention improves the locking means of the roller pump to maintain a constant clearance between the guide surface and the pressure roller, and also improves the holding means to prevent the tube from being sent when the pressure roller rotates. .

That is, the present invention includes a drive shaft rotatably provided on a main body, a plurality of pressing rollers driven by the drive shaft and aligned on a circular locus centered on the axis of the drive shaft, and the drive shaft. A tube support arranged to be isolated and accessible from the shaft, a tube held between a guide surface formed on the tube support and the pressure roller, and a tube that is difficult to displace in the longitudinal direction of the tube with respect to the main body. A roller pump includes a holding means for holding the tube receiver and a locking means for fixing the tube receiver to the main body with a predetermined interval formed between the guide surface and the pressure roller, and the holding members are arranged so that they intersect with each other. The tube is formed so as to be held between the two directions so that the tube can be sufficiently held without extreme deformation of the tube from one direction or without providing an edge, and the locking means is provided on the main body and on the tube receiver. a positioning member that can be brought into contact with the tube receiver, a locking mechanism that brings the tube receiver into contact with the positioning member under a certain biasing force, and a locking mechanism that allows the tube receiver to contact the positioning member with the locking mechanism. A position adjustment member for adjusting the clearance between the guide surface of the tube support and the pressure roller is configured, and each time the tube support is fixed to the positioning member, the clearance between the guide surface and the pressure roller is kept constant to achieve the above object. This is what I am trying to do.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on FIGS. 1 to 4.

In this embodiment, a rotatable drive shaft is provided in the main body, and a plurality of pressure rollers driven by this drive shaft are aligned and arranged on a circular locus centered on the axis of the drive shaft. A tube support is arranged so that it can be isolated and approached, and the tube is held between a guide surface formed on the tube support and a pressing roller, and the tube is held with respect to the main body so that it is difficult to displace in the longitudinal direction of the tube. The structure is similar to the conventional example described above in that it is provided with a holding means and a locking means for fixing the tube receiver to the main body with a predetermined gap formed between the guide surface and the tube. The structure, the provision of a roller drive mechanism that forcibly drives the pressure roller to rotate, the improvements in the locking means and the holding means, and in particular the improvement in the mechanism that brings the tube receiver into contact with the positioning member provided on the main body with a constant urging force. This differs from the conventional example in that it includes a stop mechanism and a position adjustment member that adjusts the clearance between the guide surface of the tube receiver and the pressing roller. here,
In the roller pump of this embodiment, explanations of the same or equivalent components as those of the conventional example will be omitted or simplified.

First, the difference in the structure of the main body will be explained. In this embodiment, one tube receiver 11 is used, and accordingly, the structure of the main body is different from the conventional example.

A fixed guide 3 in the shape of a substantially circular tube with a bottom is inserted into the round hole 2 bored in the substrate 1 provided in the casing 53, with the opening facing downward, that is, the bottom 3C.
2 and 3, and is inserted with a very small gap provided. A support column 3A is formed in approximately the lower half of the fixed guide 3 in FIG. A window portion 3B is formed. Further, a drive shaft 5 is attached to the tip of the output shaft 4 via a coupling 52. The drive shaft 5 is formed into a cylindrical shape having a large diameter part with a predetermined length in the middle part. Further, the small diameter portion on the lower end side of the drive shaft 5 is pivotally supported by a support member 7 attached to the lower end of the fixed guide 3, while the small diameter portion on the upper end side is supported pivotally on the bottom portion 3C of the fixed guide 3. .

A substantially thick-walled rectangular plate-shaped tube support 11 is rotatably attached to a predetermined position on the substrate 1 via a spindle screw 12. It is considered possible.

Next, the roller drive mechanism will be explained.

A ring-shaped retainer 9 that rotates integrally with the drive shaft 5 is provided on the upper end side and the lower end side small diameter portion of the drive shaft 5 via a retainer mounting member 9A,
A predetermined number, for example, four pressing rollers 8 are rotatably supported on this retainer 9. An idle ring 10 is provided inside the retainer 9, and the idle ring 10 comes into contact with the pressing roller 8 at its outer periphery to restrict movement of the pressing roller 8 into the retainer 9. The large diameter portion of the drive shaft 5 is inserted through the idle ring 10 with a predetermined gap, and a roll-shaped bearing 2 is inserted between the large diameter portion and the idle ring 10.
A plurality of zeros are provided to ensure smooth rotation of the drive shaft 5.

Next, the lock means of this embodiment will be explained.

As shown in FIG. 1, the tube receiver 1
A positioning screw 30 is implanted along the rotational direction on the rotational end side of the tube support 11, and the tip of the positioning screw 30 is fixed when the abutting edge 15A of the tube receiver 11 abuts against the fixed guide 3. It is adapted to come into contact with an end surface of a positioning member 31 attached to the substrate 1. Here, by adjusting the screwing amount of the positioning screw 30, the tube receiver 11
The clearance between the guide surface 15 and the pressing roller 8 can be finely adjusted, and the positioning screw 30 constitutes a position adjustment member. Further, a first link 33 with one end rotatably supported is provided on a side surface adjacent to the one side surface of the positioning member 31, and one end is rotatably supported on the other end of the first link 33. A second link 34 is provided, and the other end of the second link 34 is connected to a hook 11 protruding from the rotating end of the tube receiver 11.
It is said that it can be locked with D. Here, a locking mechanism 38 is constituted by the hook 11D, the first link 33, and the second link 34, and this locking mechanism 38,
A locking means 35 is constituted by the positioning member 31 and the positioning screw 30, and this locking means 35
is a so-called toggle device, and the second link 34
While urging the first link 33 toward the positioning member 31 while being locked to the hook 11D,
When the link 33 and the second link 34 are aligned on the same straight line, the tube receiver 11 is fixed to the positioning member 31 under a certain urging force, and when this is fixed, the window portion 3B of the fixed guide 3 is guided. substantially closed by the surface 15, and the guide surface 1
5 and the pressure roller 8 is constant, and the tube receiver 11 is properly positioned.

Furthermore, the holding means of this embodiment will be explained.

A first holding plate 41 is attached to one side of the substrate 1 on the right side in FIG. It is formed over a predetermined length along the direction. A second holding plate 43 is attached to the first holding plate 41 by screws 42 so as to overlap with the first holding plate 41.
2 has an elongated guide hole 43B through which it passes, and
The first holding plate 41 is slidable along the longitudinal direction. Further, at the tip of the second holding member 43, a first holding plate 41 is provided as shown in FIG.
has substantially the same width as the groove 41A, and has the same width as the groove 41A.
A groove 43A perpendicular to 1A is formed. Here, a holding means 44 is constituted by the first and second holding plates 41 and 43, and this holding means 44 holds the tube 16 in the grooves 41A and 43A so as to deform it from directions orthogonal to each other. ,
It is considered difficult to displace the tube 16 in the axial direction.

Note that the roller pump shown in FIG. 4 is illustrated larger than the roller pump shown in FIGS. 1 to 3 in order to make the content easier to understand.

Next, the operation of this embodiment will be explained.

First, a method for mounting the tube 16 will be explained.

A tube 16 is arranged between the guide surface 15 of the expanded tube receiver 11 and the pressing roller 8. Further, a predetermined portion of the tube 16 is held between the grooves 41A of the first holding plate 41, and the second holding plate 43
is slid to allow the groove 43A to sandwich the vicinity of the predetermined portion of the tube 16. That is, the first and second holding plates 41 and 43 hold and deform a part of the tube 16 from two mutually perpendicular directions. Furthermore, the tube receiver 11 is brought close to the pressing roller 8, the tube 16 is held between the guide surface 15 and the pressing roller 8, and the other end of the second link 34 is locked to the hook 11D, One end of the second link 34 is urged toward the positioning member 31 so as to be substantially in line with the first link 33 . Thereby, the tube receiver 11 is brought into contact with the positioning member 31 under a constant urging force, and an optimum clearance between the guide surface 15 and the pressing roller 8 is obtained. In addition, tube 1
When changing the clearance between the guide surface 15 and the pressing roller 8 in order to match the diameter of the positioning screw 30, etc., the screwing amount of the positioning screw 30 is adjusted.

Next, the operation of the roller pump will be explained.

When the drive shaft 5 is rotated by the output shaft 4 in the above-described state, the retainer 9 is rotated together with the drive shaft 5. Each pressing roller 8 is in contact with the fixed guide 3 via the tube 16, and thus moves while rolling on the tube 16. On the other hand, an idle ring 10 provided within the retainer 9 is engaged with the pressure roller 8 to rotate in the same direction as the retainer 9, and also restricts movement of the pressure roller 8 into the retainer 9.

As the pressure roller 8 moves in this manner, since the tube 16 is supported along the guide surface 15, the blocked portion of the tube 16 also moves, and as a result, the tube 16 sucks and discharges the fluid within the tube.

Here, due to the rotational movement of the pressure roller 8, the tube 16 is pulled in this rotational direction, but since the tube 16 is sufficiently held by the holding means 44, it cannot be sent in the rotational direction. do not have.

According to this embodiment, accurate suction and discharge operations can be performed. That is, a locking mechanism 38 composed of the first and second links 33, 34 and the hook 11D, the positioning member 31, and the positioning screw 30 constitute the locking means 35, and the locking means 35 is configured by these to press against the guide surface 15. Since an appropriate clearance with the roller 8 is obtained, even if the tube receiver 11 is repeatedly opened and closed due to replacement of the tube 16, etc., the clearance will be constant each time the tube receiver 11 is fixed to the main body, and the suction and discharge will be maintained. Operation becomes accurate. In addition, since the tube receiver 11 is not fixed with bolts or the like as in the conventional example, it can be operated with a single touch, and there is less chance of forgetting to tighten the bolt, and furthermore, if this forgetting to tighten the bolt, it will not function as a pump. This inconvenience will be eliminated. Furthermore, according to this embodiment, the clearance between the guide surface 15 and the pressing roller 8 can be changed using the positioning screw 30 installed in the tube receiver 11, so even when using the tube 16 with a different diameter, etc. The clearance can be adjusted very easily according to the diameter, and can be easily applied to tubes 16 of various diameters. Furthermore, the first and second holding plates 41,
Since the tube 16 is held by the tube 43, the tube 16 is not sent, which allows stable operation of the pump. Moreover, the first and second
Even if the tube 16 is held by the holding plates 41 and 43, no extreme difference in the liquid flow path is caused, cavitation does not occur, and no edges are formed. No damage to the product. Therefore, it is ideal for pumps that require the use of tubes with limited elasticity, such as medical infusion tubes, because the material is limited, because the tube 16 can be held sufficiently without being deformed much.

In addition, since there is a very small gap when the fixed guide 3 is inserted into the round hole 2 provided in the substrate 1, an error in the feed amount of the roller pump occurs due to thermal expansion of the fixed guide 3 etc. due to temperature changes. Never.

In the above embodiment, the holding means 44 is composed of the first and second holding plates 41 and 43, and the groove 4
1A and 43A, the tube 16 is held from two directions that are orthogonal to each other, but the holding means of the present invention does not have to be orthogonal to each other to hold the tube 16 from two directions that are orthogonal to each other.
It may be one that holds the tube 16 from the direction,
Furthermore, the tube 16 may be held between three directions by three or more members each having a groove, or the tube 16 may be held between three or more members, each having a groove.Furthermore, the tube 16 may be held between three or more members having grooves. Further, in the locking means 35, the hook 11D
is formed on the tube receiver 11, and the first link 33 is provided on the positioning member 31, but in the present invention, this may be reversed. Furthermore, the positioning screw 30 is not limited to the tube receiver 11 side, but may be provided on the positioning member 31 side. Furthermore, the positioning member 31 may be formed integrally with the substrate 1. Furthermore, as in the conventional example, the pressure roller 8 is
The retainer 9 may be in a free state and may be rolled and rotated on the drive shaft 5, and furthermore,
Two tube receivers 11 may be provided as in the conventional example.

[Effect of idea]

According to the present invention as described above, there is an effect that accurate suction and discharge operations can be performed and stable operation of the pump can be performed.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an embodiment according to the present invention, FIGS. 2 and 3 are sectional views taken along lines - and - in FIG. 1, and FIG. 4 is an enlarged side view of the embodiment.
Figure 5 is a plan view of the conventional example, and Figure 6 is the middle of Figure 5.
FIG. 3 is a cross-sectional view taken along the line. 1, 3, 11...Substrate constituting the main body, fixed guide, tube holder, 5...Drive shaft, 8...Press roller, 9...Retainer, 11D...Hook, 1
5... Guide surface, 16... Tube, 30... Positioning screw, 31... Positioning member, 33... First link, 34... Second link, 35... Locking means, 38... Locking mechanism, 41...first holding plate,
41A, 43A...Groove, 43...Second holding plate, 4
4...Holding means.

Claims (1)

[Claims for Utility Model Registration] (1) A drive shaft rotatably provided on the main body, and a plurality of drives driven by this drive shaft and aligned on a circular locus centered on the axis of the drive shaft. a pressure roller, a tube support arranged so as to be isolated and accessible from the drive shaft, a tube sandwiched between a guide surface formed on the tube support and the pressure roller, A roller pump includes a holding means for holding the tube support so that it is difficult to displace in the longitudinal direction, and a locking means for fixing the tube support to the main body with a predetermined clearance formed between the guide surface and the pressure roller. The holding means is formed so as to sandwich the tube from directions intersecting with each other, and the locking means includes a positioning member provided on the main body and with which the tube receiver can come into contact, and a tube receiver attached to the positioning member. A locking mechanism that brings the tube into contact under a constant biasing force, and a position adjustment member that adjusts the clearance between the guide surface of the tube support and the pressure roller when the tube support comes into contact with the positioning member using the locking mechanism. A roller pump comprising: (2) Utility model registration In claim 1, the locking mechanism has a hook provided on one of the tube receiver and the positioning member, and one end of the locking mechanism is rotatable on the other of the tube receiver and the positioning member. A roller pump comprising: a first link; and a second link, one end of which is rotatably provided to the first link and the other end of which is latched to the hook. (3) In claim 1 or 2 of the utility model registration claim, the holding means includes first grooves attached to the main body and each holding a tube.
A roller pump comprising a retaining plate and a second retaining plate, the second retaining plate being slid with respect to the first retaining plate to sandwich the tube from directions orthogonal to each other.