SU449505A3 - Hose pump - Google Patents

Description

one

The invention relates to a pasostroy ™ and can be used in systems for continuous chemical analysis of liquid and gaseous agents.

Hose pumps are known with a rotor mounted on a shaft in a housing and interacting fresh rollers with hoses, an extreme sea, one of which is connected to a source of inert medium, predominantly gas,

When using well-known pumps in systems with an analysis, the results of the analysis are influenced by the pump supply pulsation, which occurs when the rollers from the needles run off. The harmful effect of pump supply pulsation is explained by the fact that its size is different for different hoses, but each which delivers a certain dose of reagents. Thus, at the time of the rolling of the rollers of its hoses, the correspondence of the doses of reagents in the known casos is broken.

The purpose of the invention is to reduce the effect of pump pulsation when used in analyzing systems. For this, the proposed pump is equipped with a device

for periodically clamping from the discharge side of the hoses connected to the source of an inert medium consisting of a support plate and a pressure pin, and on the rotor shaft is installed with the possibility of relative displacement and fixation in one of the possible positions the cam interacts through lever transmission with push pin.

On fkg. Figures 1 and 2 depict the proposed n-asos, in two projections.

FIG. 3 - device for periodic clamping of hoses.

The pump consists of a casing 1 in which a rotor 2 is installed with rollers 3 bent on a chain 4. A chain 4 is driven. - in the leading asterisk.5. The rollers 3 of the rotor 2 interact with one or more sh. Flanks 6 dl. supply of reagent and slang 7 to supply inert media. The hoses 6 and 7 are mounted on a support plate 8, which springs 9 and 10 are pressed against the rotor 2. On the shaft 11 of the sprocket sprocket 5 there is a gear 12, which interacts with the gear 13, mouth 3

innovated on the shaft of the drive engine 14

A cam 15 is connected with a gear wheel 12, in which slots 16 are made. In the latter, screws 17 j are fixed which are fixed in any of their possible angular positions relative to gear wheel 12. With working surface 18 cam 15 having projections 19 by number of rollers 3 on a chain 4, the roller 20 fixed on the lever 21. The roller 22 mounted on the other arm of the lever 21 interacts with the lever 23 which is fixed on the axis 24 of the push pin 25. A return spring 26 is connected to the lever 23 acting on the levers 23 to 21 to pushing 2O roller to the working surface 18 of the cam 15. The hose 7 for supplying the inert medium is placed on the support plate 27 and interacts with the pressure schtiftom 25. The supporting plate 27 is provided with a lever 28, supported on koto.ry tail protrusion 29 cover 30 of the pump. In the protrusion 29 is made a groove 31, in which the axis 32 is located. On the side opposite to the axis 32, the pump cover of the pump is provided with a locking device 33.

When the shaft 11 rotates from the first engine 14, the drive sprocket 5 drives chain 4 with rollers 3. Reagents and inert media are injected through hoses 6 and 7 in the direction of movement of rollers 3, then they go to the mixer / not shown in the drawings /. Together with the shaft 11, the cam 15 is coupled to the gear wheel 12. The reciprocal angular position of the cam 15 and the gear wheel 12 is adjusted with screws 17 so that at the time of the rollers 3 running off the hoses 6 and 7, the projections 19 of the cam 15 act through the lever gear 21 and 23 to the push rod 25, lift it. Pressure igtifet 25 releases the hose 7, and the inert medium from the hose enters the mixer, preventing the reagents from shifting and distorting the results of the analysis. After the rollers 3 run off from the hoses 6 and 7, the push pin 25 under the action of a return spring 4

26 is lowered onto the support plate 27 and the hose 7 is clamped with an inert medium, stopping its entry into the mixer. When running off the hoses 6 and 7 of the next psma rollers 3, the cycle is repeated. At the exit from the mixer, the flow is a set of consecutive volumes of reagents and volumes of an inert medium, and the ratio of doses of reagents B of their mixtures is practically not affected by the effect of pump pump pulsation.

When the pump is stopped for a long period of time, the sleeves 6 and 7 are free from the interaction of the rollers 3 and the pressure pin 25 in order to prevent residual deformation of the hoses. To do this, the locking device 33 opens and the pump cover 30 is folded back on the axles 32. Together with the cover 30, the support plate 8 connected with it is folded back. The tail projection 29 of the cover 30 leaves, leaving the support plate 27 under its own weight. In this way, the hoses 6 and 7 are relieved from squeezing both by the rollers 3 and the push pin 25.

Claims (1)

Invention Formula A hose pump with a rotor mounted on a shaft in the housing and interacting with its rollers with hoses, at least one of which is connected to an inert medium, mainly gas, characterized in that, in order to reduce the effect of pump pulsation when used in analyzers systems, it is equipped with a device for periodically clamping from the discharge side of the hoses connected to the source of inert medium consisting of a support plate and a pressure pin, and is mounted on the rotor shaft with the possibility of axial angular displacement and fixation (in one of the possible positions of the cam, interacting by means of a lever transmission with the aforementioned pin. SCH ( fig.Z