JPH04101087A - Tube for tube pump - Google Patents

Abstract

PURPOSE:To improve durability by providing two crease like protrusions opposedly on the inner peripheral surface of a deflectable tube approximately along the whole length of the tube in a device for clamping the tube successively toward the discharge opening side from the suction port side by a clamping member so as to deliver a fluid continuously. CONSTITUTION:A deflectable pump tube 1 made of silicone rubber is fitted into a casing 2 provided with the circular inner peripheral surface in such a way as to be along the approximately half periphery of the easing 2 and also in such a way that two crease like protrusions 1a provided opposedly on the inner peripheral surface are positioned on both end parts of the flat cross section at the time of the pump tube 1 being clamped by a clamping member. A suction port 3 and a discharge opening 4 on both ends are respectively inserted into a suction side connecting tube 7 and a discharge side connecting tube 8, and a rotary plate 10 supported on the center of the casing 2 by a shaft 11 is rotated in the direction of an arrow mark to feed liquid. The radius of curvature on both end parts of the flat cross section at the closed time of the tube 1 is eased by thus providing two crease like protrusions on the inner peripheral surface of the tube 1, and fatigue caused by the generation of local stress can be avoided to heighten durability.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention applies pressure to a flexible tube sequentially from the suction port side to the discharge port side using a pressure member, and repeats closing and opening to prevent paint and fluid flow. This invention relates to a tube for a tube-type pump that continuously delivers fluids such as food and pharmaceutical solutions.

[Prior Art] This type of tube pump includes, for example, a flexible pump tube disposed within a circular casing,
A flexible tube is sandwiched between the casing and a roller attached to the tip of an arm that rotates at the center opening of the casing, and the flexible tube is repeatedly squeezed from the suction port side to the discharge port side, thereby generating suction. A device that sucks in liquid from the mouth and discharges it from the discharge port is known, but since the flexible tube is deformed into a completely flat shape at the pressure part between the roller and the casing,
Both ends of the flat section of the flexible tube are bent with a small radius of curvature, creating high stress, and repeated deformation causes fatigue and breaks in a relatively short period of time, resulting in poor durability.

[The problem that the invention tries to solve! ! [] In order to solve this drawback, a method has been proposed in which a belt-shaped insert is inserted into the flexible tube, and the flat cross section of the pump tube is Relax the radius of curvature on both sides,
It became possible to avoid fatigue caused by localized stress generation, and the lifespan was dramatically extended.

However, when the belt-shaped insert is inserted into the pump tube, the delivery material remains at the fixing part of the belt-shaped insert or between the pump tube and the belt-shaped insert, and the remaining material may solidify or deteriorate. New drawbacks have arisen, such as the risk of injury and the difficulty of cleaning the inside of the tube.

[Means for Solving the Problems] As a means for solving the above-mentioned problems, the tube for a tube pump of the present invention has a flexible tube that is sequentially moved from the suction port side to the discharge port side using a clamping member. In a tube type pump that continuously sends out fluid by repeatedly closing and opening the tube, two pleated protrusions are provided on the inner peripheral surface of the tube, extending substantially over the entire length of the tube. The structure is as follows. In addition, in the said structure, the wall thickness distribution of a tube cross section may become thicker as it becomes distant from the vicinity of the base of the said pleat-like projection.

[Operations and Effects of the Invention] The present invention has the above-mentioned configuration, and when the flexible tube is compressed by the clamping member in use, the two pleated protrusions provided facing each other on the inner circumferential surface When the tube is attached so as to be located at both ends of the flat cross section, as the tube deforms into a flat shape, the two fold-like protrusions located on the inner surfaces of both sides of the tube are deformed so as to be pinched, and the inner circumferential surface of the tube is The two fold-like protrusions assist in the sealing function of the inner surfaces of both ends of the flat cross section. In addition, by making the wall thickness of the opposing tube section thicker than near the base of the fold-like protrusion when the tube is in a flat state when the tube is closed, the inner tube can be curved with an amount of squeezing pressure that is even smaller than the amount of squeezing pressure of the tube. occlusion state is obtained.

Therefore, according to the tube of the present invention, the inner periphery of the tube can be closed with a radius of curvature larger than the radius of curvature at both ends of the tube cross section in the closed state of a normal flexible tube, and the stress generated in the tube is low. It has the effect of improving durability. Furthermore, the tube of the present invention has a one-piece structure, and the inner circumferential surface is smooth and has no irregularities, and no liquid pools occur, so it is possible to prevent the discharged material from remaining inside the tube, which may cause solidification or deterioration of the quality of the discharged material. The inside of the tube can also be cleaned easily. Further, the tube has the advantage that it can be manufactured at low cost by extrusion molding, and the number of parts can be reduced due to its simple structure.

[Example] Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a sectional view of an embodiment of the tube pump cut along the central axis of the tube. Fig. 2 shows the non-squeezed state of the embodiment set forth in claim 1 in which pleated projections are provided, Fig. 3 shows the non-squeezed state of the embodiment set forth in claim 2, and Fig. 4 shows the non-squeezed state of the embodiment set forth in claim 2. FIG. 3 is a cross-sectional view of the tube of the present invention showing each clamping state using a cut plane perpendicular to the central axis of the tube.

In FIG. 1, reference numeral 1 denotes a flexible pump tube made of silicone rubber, and when it is squeezed by a pinching member, two pleated protrusions provided opposite to each other on the inner circumferential surface are formed. The casing 2 is fitted into a casing 2 having a circular inner circumferential surface so as to be located at both ends of a flat cross section along approximately half the circumference of the casing 2, with the suction port 3 and the discharge port 4 at both ends being parallel to each other. The center of the casing 2 is inserted into the suction side connecting pipe 7 and the discharge side connecting pipe 8 attached to the opening 6 formed in , the rotating plate 10 is connected to the shaft 1
1 and rotated in the direction of the arrow by a drive motor (not shown).Press rollers 12 are supported by shafts 13 at three apexes of the rotary plate 10, and each roller 12 is rotated in the arrow direction by a drive motor (not shown). As shown in detail in the figure, the outer periphery is an arcuate convex surface, and the width is narrower than the width of the cross section when the pump tube 1 is deformed into a flat shape.

This embodiment has such a structure, and when the rotary plate 10 is rotated, the roller 12 corresponds to the inside of the pump tube 1 fitted along the inside of the casing 2, and the gap between the roller 12 and the inner circumferential surface of the casing 2 increases. When the pump tube 1 is pinched and gradually deformed into a flat shape, the fold-like protrusions 1a on both sides are formed before the both ends are completely bent with a small radius of curvature, as shown in Fig. 4. are in close contact with each other, and the pump tube 1 is occluded. When the rollers 12 pass, the pump tube 1 opens again as shown in FIG. 2 or 3 due to its elastic expansion force, and this causes each roller 1
2, the process is repeated sequentially from the suction port 3 side to the discharge port 4 side, and since the three rollers 12 are installed at 120 degree intervals as described above, one roller 12 is While pinching the pump tube 1 at the pinching start position A and gradually moving toward the discharge port 4 side, the roller 12
Fluid in a tank (not shown) is sucked into the pump tube 1 at the rear of the pump tube 1 from the suction port 3, and when the next roller 12 pinches the pump tube 1 at the squeezing start position A, the volume chamber 14 with both ends closed opens. The fluid is transferred to the discharge port 4 side while being confined in the volume chamber 14, and when the front roller 12 passes the clamping end position B, the fluid is trapped in the volume chamber 14.
The front side of the chamber 14 is opened and the fluid in the volume chamber 14 is discharged through the discharge port 4, and this is sequentially repeated to continuously discharge the fluid.

In this embodiment, two fold-like protrusions 1a are provided on the inner circumferential surface of the pump tube 1 over substantially the entire length of the tube, so that the radius of curvature at both ends of the flat cross section when the tube is closed can be relaxed. This has made it possible to avoid fatigue due to local stress generation, but furthermore, by making the wall thickness distribution 1b of the tube cross section facing the tube thicker than other parts when the tube is in a flat state, the pump tube 1 can be improved. At the time of squeezing, the inner peripheral surface of the pump tube 1 can be tightly closed with a smaller amount of squeezing force than when using the tube having a uniform thickness as in the above embodiment, and the outer circumferential surface can be closed tightly. A roller 12 with an arcuate convex surface is attached to the pump tube 1.
When it is applied to the center of one side, both ends of the cross section of the pump tube 1 are deformed so as to bulge out to the outside of the side surface of the roller 12, so that the radius of curvature at both ends of the cross section of the pump tube 1 is large. The stress generated by
Even if deformation is repeated, there is no risk of fatigue failure, resulting in a longer service life. In addition, the tube has a one-piece structure, and the inner surface is smooth and has no irregularities, so there is no liquid pooling, which prevents residual material from remaining in the tube, which can cause solidification or deterioration of the material inside the tube, and makes it easy to clean the inside of the tube. It can be done.

Regarding the number of rollers 12, two may be provided at 180 degree intervals, or four or more may be provided. In addition, the present invention is not limited to the rotary one-way type chinibu pump shown in the above embodiment, but the pump can be pumped by providing a plurality of pairs of clamping bodies facing each other and repeatedly moving back and forth on both sides of the pump tube arranged in a straight line. The present invention can be similarly applied to a linear type tube pump in which the tube is repeatedly compressed and closed from the suction port side to the discharge port side.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of an embodiment of the present invention, FIGS. 2 and 3 are cross-sectional views of the pump tube in a non-squeezed state, and FIG. 4 is a cross-sectional view of each pump tube in a compressed state. 1: Pump tube 2: Casing 3: Suction port 4
: Discharge port 6: Opening 7: Suction side cap 8 = Discharge side metal
10: Rotating plate 12: Roller 14: Volume chamber

Claims (1)

[Scope of Claims] 1. A flexible tube is sequentially compressed from the suction port side to the discharge port side using a pressure member, and fluid is continuously delivered and sucked by repeating closing and opening. 1. A tube for a tube pump, characterized in that the tube is provided with two opposing pleat-like protrusions on the inner circumferential surface of the tube over substantially the entire length of the tube. 2. The tube for a tube pump according to claim 1, wherein the thickness distribution of the cross section of the tube becomes thicker as it gets farther away from the vicinity of the base of the pleated projection.