| Peristaltic pump, method for manufacturing a hose therefor, and hose for such a pump -> Monitor Keywords |
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Peristaltic pump, method for manufacturing a hose therefor, and hose for such a pumpRelated Patent Categories: Pumps, Expansible Chamber Type, Elongated Flexible Chamber Wall Progressively Deformed, Deformation By Rolling Or Sliding Engagement Member, Plural Spaced Engagement Members Or Member PortionsPeristaltic pump, method for manufacturing a hose therefor, and hose for such a pump description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070224063, Peristaltic pump, method for manufacturing a hose therefor, and hose for such a pump. Brief Patent Description - Full Patent Description - Patent Application Claims
[0001] The invention relates to a peristaltic pump for circulating a medium, such as a liquid, a gas, a slurry, a granulate or a combination of two or more thereof, which pump comprises: [0002] a pump housing; [0003] a pressing surface present in this pump housing; [0004] an elastically deformable hose, a part of which lies against the pressing surface, which hose has a medium inlet and a medium outlet; and [0005] pressing means with a number of equidistantly placed pressing elements such as rollers or cams; [0006] which pressing means are drivable such that the pressing elements move along the hose; and [0007] which pressing elements during operation press the hose part in contact with the relevant pressing element against said pressing surface part while locally compressing and closing the hose part; [0008] this such that during driving of the pressing means medium is drawn in via the medium inlet and discharged under pressure via the medium outlet. [0009] Such a peristaltic pump is known for instance from US-A-2006/0018777. [0010] Owing to the local compression, and thereby closing of the hose by the pressing elements, and the displacement of this local compression under the influence of the pressing elements driven along the hose, the medium present in the hose will be pushed along. After a pressing element has passed, the form of the hose is restored due to its elastic properties. Owing to this mechanism medium is drawn into the hose on the suction side. [0011] Because it is ensured that the hose is always pressed shut locally by at least one locally acting pressing element, the pump operates as closing valve such that the delivery side and the suction side are separated from each other. [0012] The hose is successively loaded locally in the peristaltic pump by the pressing elements passing under pressure. This causes fatigue in the material of the hose. A fatigue crack hereby occurring after a period of time can eventually result in breaking of the hose, whereby the medium which has been pumped and which is to be pumped can flow out of the hose, and lubricant possibly present on the outside of the hose can mix with pumped medium. Because the process of crack formation depends on many factors, the moment at which the break occurs is difficult to predict. A break causes the described technical disruptions, among others, and results in undesired maintenance at a non-predictable moment in time. [0013] In the light of the foregoing it is an object of the invention to substantially increase the lifespan of the hose. [0014] In addition, peristaltic pumps of the described known type are often not competitive with other displacement pumps because the pump capacity of peristaltic pumps is relatively small in relation to their dimensions and their cost price. Increasing the capacity by increasing the rotation speed could be considered, were it not for the fact that the lifespan of the hose would hereby be greatly shortened by the usual peristaltic pumps. It is therefore a further object of the invention to modify the known pump such that the lifespan of the hose is prolonged or the pump capacity is increased by increasing the rotation speed of the pump. [0015] The pump known from said American patent US-A-2006/001877 comprises a layered hose, wherein the inner layer consists of PTFE (polytetrafluoroethylene) with which the chemical resistance of the hose is brought to a desired level. The carrier or casing can consist of various different elastomers, for instance a material commercially available under the name Santoprene. According to this American patent the pump hose has the chemical resistance of a fluoroplastic material and the resilience of an elastomer. [0016] The problem which however occurs in this known hose is that, due to the continuously repeated compression and expansion, the pump is subject to premature delamination as a result of the strong shear forces occurring repeatedly each time. The hose hereby becomes unusable in a short time since the integrity of the PTFE layer is broken and the chemical resistance of the hose therefore becomes determined by that of the material of the carrier which is not specially designed or chosen for this purpose. The lifespan of this known pump hereby leaves a great deal to be desired. [0017] With a view to the foregoing, the invention provides a peristaltic pump of the type stated in the preamble which has the feature that the pressing surface, the hose and the pressing means with the pressing elements are situated in a bath with lubricant; and [0018] the hose consists solely of a homogeneous thermoplastic vulcanizate (TPV). [0019] It is noted that U.S. Pat. No. 2,428,619 shows a possible mechanical principle of a lubricated hose pump. Mention is made, in very general sense and without any further specification, of a plastic material such as a natural rubber, a synthetic rubber or a similar material which is suitable for the medium for circulating. [0020] In no way whatsoever does this publication point in the direction of the possibility of the hose consisting solely of a homogenous thermoplastic vulcanizate as according to the teaching of the present invention. Attention is also drawn in this respect to the fact that this American patent refers to a hose with a layered structure, this even being wholly contrary to an important basic principle of the invention. [0021] It must also be noted in this respect that the hose according to the invention, in accordance with the given definition, is free of any form of reinforcement such as embedded fibres with tensile strength, for instance in the form of a mat, as is known and usual per se for hose pumps. [0022] In a preferred embodiment the pump has the feature that the material of the hose comprises ethylene propylene diene rubber (EPDM) and polypropylene (PP). [0023] In a specific embodiment the pump has the special feature that the pump is of the linear type. "Linear" is understood to mean a pump wherein the pressing elements follow an at least more or less linear path along the pressing surface, which pressing surface likewise has an at least more or less linear form. [0024] A peristaltic pump is further known for circulating a medium, which pump is of the rotating type and comprises: Continue reading about Peristaltic pump, method for manufacturing a hose therefor, and hose for such a pump... 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