JPH0729262Y2 - Roller pump - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an improvement of a roller pump, and more specifically, a tube arranged along a guide surface is pressed and pinched by a pressing roller, and the pressing roller is rotated. The present invention relates to a roller pump that sucks and discharges a fluid in a tube by moving it.

[Background technology and its problems]

Roller pumps are used in a wide range of fields such as various researches, analysis, inspection manufacturing, etc., but generally, it is particularly desired that the transport amount of the fluid in the tube, that is, the discharge amount can be accurately controlled. is there.

The structure of a conventional roller pump is shown in detail in FIGS. 7 and 8. In these figures, a circular hole 2 is formed in the center of a flat plate-shaped substrate 1 so as to penetrate through the upper and lower surfaces thereof, and a substantially circular tubular fixed guide 3 is fitted in the circular hole 2 with a very small clearance. ing. At this time, female screw portions 1A are provided on both side surfaces of the substrate 1 so as to be orthogonal to the axial direction of the round hole 2 from the outside of the substrate 1 toward the axial center thereof. On both sides of the peripheral surface of the fixed guide 3, that is, substantially central portions on both the left and right sides in the drawing, window portions 3B are formed by notching along a circumferential direction in a predetermined range. 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 a tip end of the output shaft 4, and an upper end of the drive shaft 5 is attached to the upper end. Cap 19 is attached.

A plurality of pressing rollers 8 are arranged on the peripheral surface of the drive shaft 5 so as to be rotatable on the peripheral surface. These pressing rollers 8 are rotatably held by a substantially ring-shaped retainer 9 at equal intervals along the circumferential direction of the drive shaft 5.

An adjusting screw 29 is screwed into the female screw portion 1A of the board 1, and the tip of the adjusting screw 29 is brought into contact with the outer periphery of the lower portion of the fixed guide 3 to increase the amount of screwing of the adjusting screw 29, whereby the fixed guide A pressing force is applied to the outer periphery of the lower portion of the fixed guide 3 to deform the fixed guide 3 in the radial direction of the drive shaft 5 within the elastic limit.

Two tube receivers 11 are rotatably attached to the rear position of the upper surface of the substrate 1, that is, on the upper end side in FIG. It is said that it can be opened and closed with the fulcrum as a fulcrum. On the side surfaces of the tube receiver 11 facing each other, arcuate guide surfaces 15 centered on the axis of the drive shaft 5 are cut out. The dimension of the guide surface 15 along the axial direction of the drive shaft 5 is formed to be the same as the width of the window 3B. Further, the guide surface 15 has a perfect circular shape having a diameter larger than the inner diameter of the fixed guide 3 and smaller than the outer diameter thereof, and an abutting edge 15A having a square cross section is circumferentially formed on the upper end edge of the guide surface 15. It is formed along. Here, the main body is configured to include the substrate 1, the fixed guide 3, and the tube receiver 11.

Further, a butterfly bolt 13 is inserted and mounted on the rotation end side of the tube receiver 11 along the rotation direction of the tube receiver 11, and the butterfly bolt 13 is a mounting screw fixed to a front position of the upper surface of the substrate 1. When the wing bolt 13 is screwed in from the radial direction and the wing bolt 13 is screwed into the mounting screw 14, the two tube receivers 11 are in a state of sandwiching the fixed guide 3 from both sides. In the state where the contact edge 15A is in contact with the fixed guide 3, the tube receiver 11 is fixed by the wing bolt 13, and
In this state, the window 3B of the fixed guide 3 is a guide surface.
It is designed to be almost completely closed by 15. 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 edge in FIG. 7, passes between the two spindle screws 12 and is formed on a holding plate 17 as a holding means mounted on the substrate 1. Groove 17
Held by A.

In such a conventional example, the holding means is composed of one holding plate 17 having the groove 17A as described above.
The tube 16 is clamped by 7A and deformed and held in one direction, but the width of the groove 17A is made extremely small with respect to the tube diameter in order to prevent the tube 16 from shifting in the longitudinal direction. Alternatively, it is necessary to provide an edge in the groove. However, reducing the width of the groove,
Alternatively, providing an edge in the groove causes an extreme difference in the liquid flow path to cause cavitation, and in some cases, providing the edge may damage the tube. On the other hand, increasing the width of the groove in order to avoid this inconvenience causes a problem that the tube 16 is displaced and the pump cannot be operated stably. In particular, the medical infusion tube has limited elasticity because of its chemical resistance and the like, and therefore has a low elasticity and the tube is not always sufficiently held, so that the pump cannot be operated stably.

[Purpose of device]

An object of the present invention is to provide a roller pump capable of stable operation.

[Means and Actions for Solving Problems]

In the present invention, the holding means is improved so that the tube is not displaced when the pressing roller is rotationally moved.

That is, the present invention relates to a drive shaft rotatably provided on a main body, a plurality of pressing rollers driven by the drive shaft and arranged in a line on a circular locus around the axis of the drive shaft.
A roller pump is formed with a tube held between the pressing roller and the guide surface and a holding means for holding the tube in the longitudinal direction of the tube with respect to the main body so that the tube cannot be displaced easily. A plurality of holding plates each having a groove formed to have an inner width narrower than the outer diameter and capable of holding a tube to be inserted are provided, and each holding plate is formed so that the grooves intersect with each other.

In such a holding means of the present invention, the tube is clamped by a plurality of grooves so that clamping or deformation of each groove can be reduced, and the clamping direction of each groove is crossed and the clamping position is set. By shifting in the axial direction of the tube, the flattened portion sandwiched in one groove is locked in the other groove, so that the tube can be reliably held.

The present invention aims to achieve the above-mentioned object by making it possible to sufficiently hold the tube without excessively deforming the tube from one direction or without providing an edge.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS.

In this embodiment, the main body is provided with a rotatable drive shaft, and a plurality of pressure rollers driven by the drive shaft are arranged in a line on a circular locus around the axis of the drive shaft. Although the tube is sandwiched between the guide surface and the holding means for holding the tube with respect to the main body in the longitudinal direction of the tube so as to be difficult to displace, it is similar to the above-mentioned conventional example, The structure is different from the conventional example in that a roller driving mechanism for forcibly rotating the pressing roller is provided, and that the locking means and the holding means are improved. Here, in the roller pump of the present embodiment, the description of the same or corresponding components as those of the conventional example will be omitted or simplified.

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

In the round hole 2 formed in the casing 1 provided in the casing 53, a fixed guide 3 having a substantially cylindrical shape with a bottom is in a state in which the opening is downward, that is, the bottom 3C is shown in FIGS. It is fitted in the upper part of the figure with a very small gap. A column portion 3A is formed on approximately the lower half of the fixed guide 3 in FIG. 1, while a half of the upper portion of the fixed guide 3 is notched along a circumferential direction in a predetermined range. Window portion 3B is formed. A drive shaft 5 is attached to the tip of the output shaft 4 via a coupling 52. Drive shaft 5
Is formed in a cylindrical shape having a large-diameter portion of a predetermined length in the middle portion. The lower end side small diameter portion of the drive shaft 5 is pivotally supported by the support member 7 attached to the lower end of the fixed guide 3, while the upper end side small diameter portion is pivotally supported by the bottom portion 3C of the fixed guide 3. .

At a predetermined position on the substrate 1, one tube receiver 11 having a substantially thick rectangular plate shape is attached. The tube receiver 11 is rotatable via a spindle screw 12, and thereby can be isolated and approach the pressing roller 8.

Next, the roller drive mechanism will be described.

A ring-shaped retainer 9 that is integrally rotated with the drive shaft 5 is provided on the small diameter portion on the upper end side and the lower end side of the drive shaft 5 via a retainer mounting member 9A, and this retainer 9 has a predetermined number, for example, Four pressing rollers 8 are rotatably supported. An idle ring 10 is provided in the retainer 9, and the idle ring 10 abuts the pressing roller 9 on the outer periphery thereof to restrict the movement of the pressing roller 8 into the retainer 9. The idle ring 10
The large-diameter portion of the drive shaft 5 is inserted with a predetermined clearance, and a plurality of roll-shaped bearings 20 are provided between the large-diameter portion and the idle ring 10 so that the drive shaft 5 rotates smoothly. It is supposed to be.

The holding means of this embodiment will be described.

A first holding plate 41 is attached to one side surface on the right side of FIG. 1 of the substrate 1, and a groove 41A having a width slightly smaller than the bore of the tube 16 is attached to the first holding plate 41. It is formed over a predetermined length along the direction. This first holding plate
A second holding plate 43 is attached by a screw 42 so as to be superposed on the first holding plate 41, and the second holding plate 43 has an elongated guide hole 43B through which the screw 42 penetrates and the longitudinal direction of the first holding plate 41. It is slidable along the direction. Also, the second
As shown in FIG. 4, a groove 43A having substantially the same width as the groove 41A of the first holding plate 41 and orthogonal to the groove 41A is formed at the tip of the holding member 43. Here, a holding means 44 is composed of the first and second holding plates 41 and 43, and the holding means 44 holds the tubes 16 in the grooves 41A and 43A so as to deform the tubes 16 from the directions orthogonal to each other. It is difficult to displace the tube 16 in the axial direction.

Next, the locking means will be described.

As shown in FIG. 1, a positioning screw 30 is planted on the rotation end side of the tube receiver 11 along the rotation direction, and the tip of the positioning screw 30 has a contact edge of the tube receiver 11. When 15A comes into contact with the fixed guide 3, it comes into contact with the end face of the positioning member 31 attached to the substrate 1. Here, the clearance between the guide surface 15 of the tube receiver 11 and the pressing roller 8 is finely adjusted by adjusting the screwing amount of the positioning screw 30. A first link 33 having one end rotatably supported is provided on a side surface of the positioning member 31 adjacent to the one side surface, and one end is rotatably supported on the other end of the first link 33. The second link 34 is provided, and the second link 34 is provided.
The other end of 34 can be engaged with a hook 11D projecting from the end of the rotation end of the tube receiver 11. Here, the positioning member 31, the positioning screw 30, the hook 11D, the first link 3
The lock means 35 is composed of the third link 2 and the second link 34. The lock means 35 is a so-called toggle device, and the first link 3 with the second link 34 locked to the hook 11D.
When the first link 33 and the second link 34 are aligned on the same straight line while urging 3 toward the positioning member 31, the tube receiver 11 is fixed to the positioning member 31 under a constant urging force. At the time of this fixing, the window 3B of the fixed guide 3 is substantially closed by the guide surface 15, and the clearance between the guide surface 15 and the pressing roller 8 becomes constant, so that the tube receiver 11 can be properly positioned. There is.

The roller pump shown in FIG. 4 is shown larger than the roller pumps shown in FIGS. 1 to 3 for easy understanding of the contents.

Next, the operation of this embodiment will be described.

First, a method of mounting the tube 16 will be described.

The guide surface 15 of the expanded tube receiver 11 and the pressing roller 8
Place tube 16 between and. Further, the predetermined portion of the tube 16 is held in the groove 41A of the first holding plate 41, and the second holding plate 43 is slid to hold the portion of the tube 16 near the predetermined portion in the groove 43A. That is, the first and second holding plates 41, 43 hold and deform a part of the tube 16 by sandwiching and deforming it from two directions orthogonal to each other. Further, the tube receiver 11 is brought close to the pressing roller 8 so that the tube 16 is sandwiched 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 biased toward the positioning member 31 so as to be substantially in line with the first link 33. As a result, the tube receiver 11 is biased by the positioning member 31 under a constant biasing force, and an optimum clearance between the guide surface 15 and the pressing roller 8 is obtained. When the clearance between the guide surface 15 and the pressing roller 8 is changed in order to match the diameter of the tube 16 or the like, the screwing amount of the positioning screw 30 is adjusted.

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

When the drive shaft 5 is rotated by the output shaft 4 in the above state,
The retainer 9 is also rotated together with the drive shaft 5. Since each pressing roller 8 is in contact with the fixed guide 3 via the tube 16, the pressing roller 8 moves while rolling on the tube 16. On the other hand, the idle ring 10 provided inside the retainer 9
Is rotated in the same direction as that of the retainer 9 by engaging the pressure roller 8 in place, and at the same time, pushes the pressure roller 8 into the retainer 9.
Regulate the movement of.

With the movement of the pressure roller 8, the tube 16 is supported along the guide surface 15, so that the closed position of the tube 16 also moves, and as a result, the tube 16 sucks and discharges the fluid in the tube.

Here, due to the rotational movement of the pressing roller 8, the tube 16 is pulled in this rotational direction.
Is sufficiently held by the holding means 44, so that it is not fed in the rotation direction.

According to this embodiment, the first and second holding plates 4 are
The tube 16 is held by 1,43, and in particular, since the holding directions of the grooves 41A, 43A are crossed and the holding position is shifted in the axial direction of the tube 16, the flattened portion held by one groove is Since the tube 16 is locked in the groove, the tube 16 can be reliably held even with a slight deformation due to light clamping.
Therefore, since the tube 16 does not shift during operation, the pump can be operated stably. Moreover, since the tube 16 is held by the first and second holding plates 41 and 43, the throttling by each of them may be mild, and an extreme difference in the liquid flow paths does not occur, and cavitation accompanying this may occur. In addition, since the first and second holding plates 41 and 43 can hold the tubes sufficiently reliably, it is not necessary to form an edge or the like on each of them, so that the tube 16 is not damaged. Therefore, since the material is limited, it is most suitable for a pump that requires a tube having a low elasticity, such as a medical infusion tube, because it can sufficiently hold the tube 16 without being deformed so much.

Moreover, according to the present embodiment, it is possible to perform an accurate suction / ejection operation. That is, the first and second links 33, 34,
Since the hook 11D and the positioning member 30 constitute the locking means 35, and the proper clearance between the guide surface 15 and the pressing roller 8 is obtained by these, the tube receiver 11 is repeatedly opened and closed as the tube 16 is replaced. Even
When fixing the tube receiver 11 to the main body, the clearance between the pressing roller 8 and the guide surface 15 becomes constant each time, and the suction / discharge operation becomes accurate. Further, unlike the conventional example, since the tube receiver 11 is not fixed with a bolt or the like, it can be operated with one touch, and it is less likely to forget to tighten the bolt, and further, this forgetting to tighten will not function as a pump. Disappears. Also,
According to this embodiment, since the clearance between the guide surface 15 and the pressing roller 8 can be changed by the positioning screw 30 implanted in the tube receiver 11, the tubes 16 having different diameters can be used.
Can be used.

In addition, since the fixed guide 3 is fitted into the round hole 2 provided in the substrate 1 with a very small gap, an error in the feed amount of the roller pump occurs due to thermal expansion of the fixed guide 3 and the like due to temperature change. Never.

In addition, in the above-mentioned embodiment, the holding means 44 includes the first and second
Although the tube 16 is constituted by the holding plates 41 and 43, and the tube 16 is sandwiched by the grooves 41A and 43A from two directions which are orthogonal to each other, the holding means of the present invention does not need to be orthogonal, but the tube 16 is provided from two directions which intersect each other. The tube 16 may be sandwiched from three directions by three or more members each having a groove. In short, an arbitrary number of holding plates having grooves may be stacked so that different positions of the tube are different. It should be able to be pinched from.

Further, as shown in FIGS. 5 and 6, the lock means 35 is rotatably attached to the substrate 1, and the tube receiver 11 can be brought into contact with the rotary shaft 60.
A bolt 61 integrally attached to the outer periphery of the rotating shaft 60,
A knob 62 fitted into the bolt 61 and capable of holding the tube receiver 11 by the rotating shaft 60, and the knob 62.
And a spring 63 interposed between the head 61A of the bolt 61 and the head 61A. In order to fix the tube receiver 11 to the main body by this, the tube receiver 11 is brought into contact with the rotating shaft 60 and then pulled against the urging force of the spring 63.
The knob 62 is rotated toward the tube receiver 11, and the tube receiver 11 is held between the rotation shaft 60 and the knob 62 by the urging force of the spring 63. In this state, the tube support is
11 is brought into contact with the rotating shaft 60 by a constant biasing force. on the other hand,
To separate the tube receiver 11 from the rotating shaft 60, the knob 62 may be pulled and rotated in the opposite direction to the above. According to such a locking means, it is possible to obtain the same effect as that of the above-described embodiment, and it is also possible to obtain the effect that the opening / closing operation of the tube receiver 11 becomes easier. Also, in the present invention, even if the locking means is a toggle device, the hook 11D is formed on the tube receiver 11 and the first link 33 is provided on the positioning member 31 as in the above-described embodiment, and vice versa. It may be formed on the positioning member 31 and the first link may be provided on the tube receiver 11. Further, it is not always necessary to provide the positioning screw 30, and even if it is provided, the positioning screw 30 is not limited to being provided on the tube receiver 11 side and may be provided on the positioning member 31 side. Furthermore, the positioning member 31
May be integrally formed with the substrate 1.

Further, the pressing roller 8 has the retainer 9 as in the conventional example.
May be set to be in a free state, and may rotate on the drive shaft 5, and two tube receivers 11 may be provided as in the conventional example.

[Effect of device]

According to the present invention as described above, there is an effect that a stable operation of the pump can be performed.

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment according to the present invention, FIGS. 2 and 3 are sectional views taken along the lines II-II and III-III in FIG. 1, and FIG. FIG. 5 is an enlarged side view, FIG. 5 is a plan view showing a modification of the present invention, FIG. 6 is a sectional view taken along the line VI-VI in FIG. 5, FIG. 7 is a plan view of a conventional example, and FIG. Is VIII-V in Fig. 7
It is an arrow sectional view which follows the III line. 1,3,11 …… Board constituting the main body, fixed guide, tube receiver, 5 …… Drive shaft, 8 …… Pressing roller, 9 …… Retainer, 11D …… Hook, 15 …… Guide surface, 16 …… Tube, 41 ... First holding plate, 41A, 43A ... Groove, 43 ... Second holding plate, 44 ... Holding means.

Claims (2)

[Scope of utility model registration request] 1. A drive shaft rotatably provided on a main body, and a plurality of pressing rollers which are driven by the drive shaft and are arranged in alignment on a circular locus around the axis of the drive shaft. A tube sandwiched between the pressing roller and the guide surface, and a holding means for holding the tube with respect to the main body so that it is difficult to displace in the longitudinal direction of the tube to form a roller pump, and the holding means is a tube. Is provided with a plurality of holding plates each having a groove formed to have an inner width smaller than the outer diameter of the tube and capable of holding a tube to be inserted, and the holding plates are stacked in such a manner that the grooves intersect each other. And a roller pump. 2. In the claim 1 of the utility model registration claim,
A roller pump, wherein each groove is formed in a cut shape from a peripheral edge of each holding plate.