RU187217U1 - PUMPING UNIT WITH DEVICE FOR INCREASING CAVITATION RESERVE - Google Patents

Abstract

Pump installation with a device for increasing the cavitation stock of centrifugal pumps with two-way water inlet to the impeller.

A pump installation with a device for increasing the cavitation stock of centrifugal pumps with two-way water inlet to the impeller can be used at land reclamation and water supply pumping stations equipped with horizontal centrifugal pumps with two-way water inlet to the impeller, with large fluctuations in the water level in the water source.

The technical result achieved by this utility model is the operation of a centrifugal pump in a cavitation-free mode, the absence of vibration and jerks, both in the pump and in the drive motor with large fluctuations in the water level in the water source.

Description

A well-known pump installation increases the cavitational reserve of axial pumps by installing jet devices of known designs in suction pipelines with the selection of water from pressure pipelines through a recirculation line (Utility Model Patent No. 160826). The disadvantage of this installation is the lack of the ability to install inkjet devices to increase the cavitation stock of centrifugal pumps due to the envisaged need for output flow on the pump blade in the form of a ring of a baking fairing.

A known pump installation with a device for increasing cavitation reserve (Patent for utility model КНР-С No. 204175600 I, February 25, 2015), in which a pump installation with a device for increasing cavitation reserve, which turns off a centrifugal pump with an impeller of a two-way inlet, a recirculation line, is proposed connecting the suction pipe to the pressure pipe. The disadvantage of this installation is the inability to increase the cavitation stock of each side of the impeller.

Closest to the proposed invention is a pumping unit containing a centrifugal pump with an impeller of a two-way inlet and a device for increasing the cavitation reserve in the form of a pipe with nozzles communicating a suction pipe with a pressure pipe (Patent of the Republic of Belarus - BY 4749 dated December 30, 2002). The disadvantage of such devices is the inability to install these devices to increase the cavitation stock of centrifugal double-entry pumps due to the need to supply a stream from the recirculation line to each suction side of the impeller in the form of a ring of a baking fairing.

The objective of the utility model is to increase the value of the cavitation stock of centrifugal pumps with two-sided entrance to the impeller.

This effect is achieved by the fact that in front of the impeller in the suction pipe of the pump, an inkjet apparatus of such a design is installed that contributes to the exit of the working stream from it, increasing the cavitation stock of each suction side of the impeller of the pump.

The technical result achieved by the proposed utility model is the operation of a centrifugal pump in the conditions of cavitation-free mode, the absence of vibration and shocks, both at the pump and the drive motor.

This technical result is achieved by the fact that in a pump installation with an impeller of a two-way flow inlet, a device for increasing the cavitation reserve is installed on the suction pipe, with a flow forming two pairs of active (working) and four pairs of passive ones from the pressure pipe through the recirculation line (sucked-in) zones, and having velocity plots of such a shape that contribute to the maximum possible transfer of energy to each suction side of the wheel. A pump installation with a device for increasing the cavitation stock of centrifugal impellers with a two-way inlet consists of a centrifugal pump 1, a suction pipe 2, a pressure pipe 3, with a recirculation line 4 embedded in it with a valve 5 connected to the body of the device for increasing the cavitation stock 6, and pipelines of the working stream 7, with nozzles 8, forming at the exit of the stream, a four-convex diagram of speed 9 (figure 1, 2).

A pump installation with a device for increasing the cavitation stock of centrifugal impellers with a two-way inlet works as follows: the centrifugal pump 1 is turned on, the valve 5 of the recirculation line 4 is opened, and the working flow enters from the pressure pipe 3 to the device for increasing the cavitation stock 6 installed in the suction pipeline 2, the pipelines of the working stream 7 and nozzles 8. The jets of the working stream, leaving the nozzles 8, form a four-convex diagram of speed 9 at the entrance to the impeller, two per each side. Two pairs of active and four pairs of passive zones (indicated by arrows in Figure 1) transferring energy from the recirculation line to the flow to the suction centrifugal pump over the entire area of each side of the impeller suction zone, thereby increasing the pump cavitation reserve (pump suction height).

Claims (1)

A pump installation comprising a centrifugal pump with a two-way inlet impeller, and a device for increasing the cavitation reserve in the form of workflow pipelines with nozzles connecting the suction pipe to the pressure pipe, characterized in that it is equipped with a recirculation line with a valve and a device body installed in the suction pipe for increasing the cavitation reserve, to which two pairs of pipelines with nozzles are connected, one pair on each side of the impeller.

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