SU1716192A1 - Peristaltic pump - Google Patents

Description

The invention relates to field construction and can be used in the construction of peristaltic pumps for pumping various fluids.

The purpose of the invention is to increase the efficiency of the pump.

FIG. 1 shows a cross section of the pump; in fig. 2 is a cross section of the pump working chamber in the suction area; in fig. 3, however, in the injection section.

The peristaltic pump (Fig. 1) comprises a housing 1, on the curvilinear supporting surface of which an elastich is placed on a tubular working chamber 2 with inlet M and outlet N channels. The propelling rollers 3 of the rotor 4 are in contact with the working chamber 2. The latter is installed in the pump casing 1 on the axis 5. A special feature of the pump is the design of the tubular chamber 2 itself, having a transverse cross-section of variable shape. In the suction section, the working chamber 2 has a cavity of circular cross section (Fig. 2), and on the injection section, it is oblong (Fig. 3). The degree of elongation of the flow section

chambers 2 (the ratio of the length of the latter to its height) as it approaches the injection section increases gradually and is not necessarily accompanied by a change in the area of this section. With respect to the pump casing 1 and to its support surface, the chamber 2 is positioned so that the small axis of its flow area is always oriented normally to the support surface of the housing 1, and the larger axis is parallel to the latter. This design feature of the pump chamber 2 is due to the fact that different parts of the chamber 2 in the process of operation perform quite specific and different functions. In the intake area, the main function of chamber 2 is to restore its original shape after deformation; under the influence of the rollers 3 of the rotor 4. The suction capacity of the pump as a whole depends on how efficiently the restoration of the flow area of the chamber 2 occurs. Close to the cylindrical shape of the chamber 2 in this area most fully meets these requirements. In the injection section, the restoration of the shape of the bore VJ

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Neither chamber 2 occurs forcibly, and therefore, the ability of chamber 2 to deform easily under the influence of rollers 3, which does not require significant energy expenditures, comes to the fore. As satisfying such requirements, the flat design of the chamber was chosen, with an elongated, oriented along section forming section of the supporting surface of the housing 1.

Since the decrease in the importance of one quality of chamber 2 (the ability to regain shape) and the increase in importance of the second quality (compliance to clamping) occurs gradually as the suction line approaches the discharge line, the design parameters of the chamber also change smoothly and in the same direction 2 (bore shape). The change in the shape of the flow area of the chamber 2 is accomplished by gradually decreasing in the direction from the suction line to the discharge line of the minor axis oriented perpendicular to the bearing surface of the housing 1 and due to a gradual increase in the same direction of its larger axis oriented parallel to the forming support surface of the housing 1 pump.

During the rotation of the rotor 4, the rollers 3, rolling over the surface of the inner wall of the elastic tubular working chamber 2, deform it, pinching the internal cavity and moving along it the pumped medium from the source to the consumer.

Since in the suction section the chamber 2 has a flow area close to a circular one, then it quickly restores its flow area immediately after the passage of the deforming rollers 3. As it approaches the output section of the chamber 2

its self-healing ability of the cross-sectional shape gradually decreases, and consequently the normal response of chamber 2 to the deformation by its rollers 3, as well as the loss of their rolling, is also reduced. The reduction of the energy cost of clamping the chamber 2 by the rollers 3 in the injection section occurs due to the change in the shape of the chamber 2, namely

passage section, which has acquired an oblong shape. Due to the orientation of the camera 2 in such a way that its flow area in any place has its major axis along the generatrix

the bearing surface of the pump housing 1 is achieved by minimizing the rolling roller 3 rolling losses, and therefore the efficiency is maximized.

In the end, the above design solution of the kemer 2 of the pump allows to reduce the energy loss of its drive.

Claims (1)

Invention Formula A peristaltic pump, comprising: a housing, on the curved supporting surface of which an elastic tubular working chamber is placed, which is designed with a reduced passage area from the inlet to the outlet and interacting with the rollers of the rotor mounted in the housing coaxially with the supporting surface, characterized in that, in order to increase the efficiency of the pump, the working chamber is made with a variable shape of the bore section round at the inlet and elongated at the outlet with a decreasing minor axis perpendicular to the support surface, and an increasing major axis parallel to the support surface in the direction from the entrance to the exit. m Fig1 FSh.1