SU1244385A2 - Self-priming centrifugal pump - Google Patents

Description

The invention relates to a pump engineering industry can be used in self-priming pumps driven by an internal combustion engine, and is additional to the author. St. No. 589466.

The purpose of the invention is to increase the reliability of the pump by preventing the pumped liquid from entering the internal combustion engine.

FIG. 1 shows a self-priming pump; in fig. 2 — node I in FIG. 1 (float valve with a chamber) with the location of the elements at the time of starting the pump; in fig. 3 shows the node I in FIG. 1 with the location of the elements when filling the pump and the body of the float valve with liquid; in fig. 4 - pump discharge pipe.

The self-priming centrifugal pump includes a housing 1 with suction and discharge nozzles 2 and 3, in the latter of which a check valve 4 is installed, an impeller 5 and a float valve 6 mounted on the housing 1. The working cavity 7 of the pump is connected through the float valve 6 to the engine intake manifold internal combustion pipeline 8. Float valve 6 is equipped with a chamber 9 with windows 10. The latter are connected to the atmosphere. In the chamber 9 there is a locking element 11 fixed on the valve 12 of the float valve 6 with the possibility of blocking the windows 10 in the lower position of the float 13. The chamber 9 is in communication with the channels 14 with the float valve 6. The locking element 11 is made in the form of communicating with axial and radial channels 15 and 16. The pump is driven from the internal combustion engine through a gearbox 17.

The pump works as follows.

To fill the working cavity of the pump, turn on the internal combustion engine, having previously disconnected the gearbox 17, and open the corresponding damper (not shown) connecting the cavity of the intake manifold through line 8 and the float valve 6 with the cavity 7 of the pump. Due to the vacuum created by the engine in the pipeline 8, the flow of fluid flowing through the suction inlet 2 fills the cavity 7 of the pump and enters further into the float valve 6. As the cavity of the valve 6 is filled with the intake fluid, the float 13 rises along with the brush 12, and the stop valve the element 11 opens the windows 10 of the chamber 9. Atmospheric air through the windows 10 enters the locking element 11 and further along the channels 14 to the 0

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the float valve 6, from where it is sucked by the internal combustion engine through the pipeline 8. If the volume of air entering through the ports 10 is sufficient to compensate for the vacuum in the cavity of the valve 6, the upward movement of the float 13 stops and the specified fluid level is maintained in the float valve 6 the volume of incoming air, depending on the size of the opening of the windows 10, is not constant: this volume is either larger or smaller than is necessary for accurate compensation of the vacuum pressure. With an excess amount of incoming air, the vacuum in valve 6 drops and the liquid level begins to decrease. In this case, the locking element 11 is lowered, partially overlapping the window 10 and thereby reducing the volume of incoming air. If the air volume is insufficient to compensate for the vacuum in valve 6, the liquid level rises and the locking element 11 moves upwards. As a result, the volume of incoming air increases. Thus, during operation of the drive motor in the float valve 6, a predetermined level of fluid is automatically maintained.

Due to the fact that the cavities above and below the locking element 11 are constantly connected with each other by channels 15 and 16, the air pressure in these cavities is always the same. This allows the locking element 11 to be in a balanced position and move freely in the chamber 9.

After the pump has been primed, the gearbox 17 is connected to the drive motor, the valve is closed at the point of connection of the pipeline 8 to the engine intake manifold, and the pump impeller 5 begins to pump fluid, which directs it to the discharge port 3, the check valve 4 of which automatically opens under the pressure of the fluid. The described constructional implementation of the pump allows to increase the sensitivity of the float valve 6, which can react even to insignificant pressure drops in the intake air, which ensures the supply of a practically constant volume of air necessary for the stable operation of the drive engine. This also makes it possible to constantly maintain the minimum fluid level in the float valve 6 at the time of starting the pump, which eliminates the possibility of liquid entering the suction manifold of the drive engine and, consequently, increases the reliability of the pump.

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Claims (2)

1. Self-priming CENTRIFUGAL PUMP by ed. St. No. 589466, characterized in that, in order to improve the reliability of the pump by preventing the pumped liquid from entering the internal combustion engine, the float valve is equipped with a chamber with windows communicating with the atmosphere and with a locking element fixed to the stem of the float valve with the possibility of closing the windows when the lower position of the float, while the camera is in communication with the float valve. 2. The pump according to π. 1, characterized in that the locking element is made in the form of a piston with axial and radial channels communicated with each other. fie. 1 SU „„ 1244385> KZ