JPH0211749B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hose for use in a peristaltic pump.

The hoses used in peristaltic pumps are subject to significant deformation stress and are abrasive members that frequently require replacement. Therefore, it is necessary to provide a hose that better withstands the deformation stresses to which it is repeatedly subjected. Such a hose should, on the one hand, have a long service life, even with the disadvantage of a rapid reduction in its suction capacity, and on the other hand, it should be suitable for transporting a wide variety of goods. It is.

The object of the invention is to provide a new hose for peristaltic pumps that meets all of these requirements.

This new hose has a seamless tubular central core made of natural or synthetic rubber;
a first reinforcement disposed on the outer surface of the core, oriented to form an angle of 30 to 60° (preferably 45°); a non-vulcanizable reinforcement deposited on the first reinforcement; a gummy layer; a second reinforcement disposed on the gummy layer; and a seamless outer sheath made of natural rubber;
Composed by.

According to a preferred embodiment of the invention, the thickness ratio between the various elements of the hose is such that the reinforcement and the gummy layer constitute substantially 1/3 of the total thickness of the hose, measured from the inner surface of the core. This is a proportion that makes up the majority of the population. Also,
Advantageously, the thickness of the gummy layer is equal to 1 mm.

The hose according to the invention furthermore has at least one end flange, which is separately seamlessly made of natural rubber and is attached to one end of the hose by bonding vulcanization. If only one flange is attached to the hose, it is advantageous to equip the hose with a seamless stop ring made of natural rubber. This stop ring forms the support for the removable flange and is attached to the other end by bonding vulcanization.

The hose according to the invention finally includes a guide ridge added parallel to the axis on its sheath by bonding vulcanization.

The present invention will be more easily understood from the following description with reference to the accompanying drawings.

FIG. 1 is a longitudinal sectional view of a hose according to the invention.

FIG. 2 is a cross-sectional view taken along the line of FIG. 1.

FIG. 3 is an external partial view of the core equipped with the reinforcing gauze of FIG. 1;

FIG. 4 is a longitudinal sectional view of the complete hose with stop ring, flange and ridge.

FIG. 5 is a cross-sectional view taken along the line - in FIG. 4.

Referring to FIGS. 1, 2, and 3, internally, there is no seam made of natural rubber or synthetic rubber.
i.e. extrusion or roping
A hose according to the invention is shown comprising a central core 1 made by molding and not by working molding. Cores are similarly manufactured from synthetic rubbers (chloroprene rubber, butyl nitrile acrylic rubber, the product known under the trade name "Hypalon", etc.). The core is then covered with a first reinforcement in the form of gauze of polyamide, rayon or wire mesh with a mesh size of 0.5 to 1 mm. This gauze 2 is arranged relative to the axis 3 of the tubular core 1 in such a way that its warp and weft threads form angles A and B of 30 to 60° with the longitudinal axis of the core. Preferably this angle is 45°. A non-vulcanizable gummy layer 4 and a second reinforcement 5 are added on top of this first reinforcement. The configuration of this reinforcement is selected in relation to the properties required for the hose and may be the same as that of the first reinforcement. The resulting composite is then covered with a sheath 6 made of natural rubber. The composite hose thus obtained has a number of advantages compared to hitherto known hoses. For example, the first stiffener reduces core wear due to internal wear at the ends of the area constricted by the passage of the rollers (this wear can puncture or tear the hose), thereby increasing the lifespan of the hose. lengthen. This first reinforcement further reduces stress within the entire hose and within the core. This effect is carried out in particular by forming a material holding element which is conveyed by rollers that squeeze the hose. Non-vulcanizable gum quality is the first
It serves as a retaining material (adhesive) that holds the second reinforcing material in the core and the second reinforcing material and the outer sheath on the inner part of the hose. This is because the non-vulcanizable gum material, due to its great plasticity, passes through the gauze mesh and, due to its adhesive properties, becomes the binding element for the entire hose. This gum also protects the hose against shear forces. Finally, the natural rubber for the exterior is a high-grade material selected for its elasticity and its easy adhesion to removable elements.

It should be noted that the thicknesses of the various components of the hose of the invention are determined such that the gum and the two reinforcements account for approximately 1/3 of the total thickness of the hose, measured from its inner surface. It is. This arrangement was tested and gave the best results. Moreover, the thickness of the gum does not exceed 1 mm. This is the optimum thickness to retain all of the gummy properties without suffering any disadvantages, among them too much plasticity which adversely affects the behavior of the hose.

Figures 4 and 5 show the hose described above with the same reference numerals except that it is equipped with a removable element. One of these elements is a flange 7 manufactured by injection molding of natural rubber (ie seamless). The flanges 7 are attached to the notches located at the ends of the hoses 1 to 6 by vulcanization bonding. There is also a stop ring 8 at the other end of the hose.
are attached by vulcanized bonding. This stop ring is likewise produced by injection molding and therefore has no seams. This stop ring has a groove 8a for mounting a removable flange (not shown). Such a flange can be attached to the stop ring 8 in a manner similar to a socket-type installation.
It is attached by notches provided both on the outside and on the flange.

Finally, ribs 9 or ridges are attached to the hose sheath over the entire length of the axis. Its function is to hold the hose in a central position inside the pump body. Such ridges are also bonded and vulcanized and made of natural rubber.

In addition to the advantages mentioned above, hoses made in this way are more durable. This means that the hose retains better elasticity during operation and suffers less permanent deformation caused by throttling by the pump's rollers. As a result, the volume of the pump chamber is better held constant, the flow is more stable, and shape recovery is faster, allowing faster rotation of the pump chamber or greater suction when pumping viscous substances. and therefore obtain a larger flow rate.

Furthermore, higher discharge pressures can be obtained using the hose according to the invention. And since this hose is manufactured without seams in any of its components, it is more homogeneous and therefore stronger than hoses manufactured by assembly or lamination of flat members.

It should also be noted that the material constituting the core can be selected from, and can be, for example, a synthetic rubber suitable for the substance to be conveyed. Due to the properties of these synthetic rubbers, it is not possible to use hoses made solely of them. This is because when used in very thick layers, these materials cannot withstand the applied abrasion and tearing forces.

Finally, this hose is such that only the core (taking into account the known connecting sleeve) comes into contact with the substance to be pumped, as shown in FIG.
Therefore, whatever the product, the end piece of the hose is made of natural rubber. Advantageously, the length of the hose is such that it is slightly constricted at both ends once the pump body is installed. This prevents the risk of detachment of the removable member.

The invention has advantageous application in the manufacture of pumps. The present invention is in no way limited to what has been described above, but is intended to embrace any changes that may be incorporated therein without departing from its scope and spirit.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a hose according to the invention. FIG. 2 is a cross-sectional view taken along the line - in FIG. 1. FIG. 3 is an external partial view of the core equipped with the reinforcing gauze of FIG. 1; FIG. 4 is a longitudinal sectional view of the complete hose with stop ring, flange and ridge. Figure 5 is the line of Figure 4.
FIG. In the figure: 1... Tubular core, 2... First reinforcing material gauze, 3... Vertical axis of core, 4... Non-vulcanizable gummy layer, 5... Second reinforcing material, 6 ...Exterior, 7...Flange, 8...Stop ring, 8a...
...Groove of stop ring, 9...Protuberance.

Claims (1)

[Scope of Claims] 1. A seamless tubular central core made of natural or synthetic rubber; arranged on the outer surface of the core in the form of gauze with a mesh of 0.5 to 1 mm and with respect to the longitudinal axis of the core. te 30～
a first reinforcement oriented at 60°; a non-vulcanized gummy layer deposited on the first reinforcement; a second reinforcement disposed on the gummy layer; and natural rubber. A peristaltic pump hose characterized by having a seamless exterior made of 2. The hose of claim 1, wherein the reinforcing material and the non-vulcanizable gummy layer account for about 1/3 of the thickness of the hose as measured from the inner surface of the core. 3. A hose according to claim 2, wherein the thickness of the gummy layer is substantially equal to 1 mm. 4. A hose according to claim 3, wherein the first reinforcement is angled at a 45° angle with the longitudinal axis of the core. 5. A hose according to claim 1, wherein the hose is separately made seamlessly of natural rubber and includes an end flange attached to one end of the hose by bonding vulcanization. 6. Claims in which the hose is seamlessly made of natural rubber, forms a removable flange support, and includes a stop ring attached by bonding vulcanization at the other end. The hose according to item 5. 7. A hose according to claim 5, wherein the hose includes a guide ridge made of natural rubber attached parallel to the axis to the outer sheath of the hose by bonding vulcanization.