RU5432U1 - PUMP INSTALLATION - Google Patents

Abstract

A pump installation including a centrifugal pump having a housing with a central hole and an impeller mounted coaxially with the central hole on the motor shaft, a suction pipe connecting the pump through the central hole of the housing with a source of pumped liquid, a pressure pipe for supplying liquid to the consumer, an ejector installed in the suction the pipeline and the bypass line connecting the ejector nozzle to the pump, characterized in that the casing is made with a peripheral hole located on the side s location center hole, and a bypass line connected to the pump through a peripheral opening of the pump housing, the latter having a second impeller mounted on the motor shaft coaxially with the first impeller.

Description

PUMP INSTALLATION

The utility model relates to pump engineering and can be used in pumping stations for various purposes.

Known pumping unit containing a volumetric pump, two ejectors and a valve.

See A.S. USSR No. 208439, class F04B 23/12, 1967

The disadvantage of the pump installation is the complexity of its design.

The closest technical solution to this utility model is a pump installation comprising a centrifugal pump having a housing with a central hole and an impeller mounted on a motor shaft coaxially with the central hole, a suction pipe, a connecting pump through a central hole of the housing with a source of pumped liquid, a pressure pipe for supplying liquid to the consumer, an ejector installed in the suction pipe and a bypass line connecting the ejector nozzle to the pump.

See, A.S. USSR No. 1560808, class F04D 15/00, 1990

The disadvantage of the design is the difficulty of setting up the installation for operation and the complexity of the design.

The objective of the utility model is to simplify the design and increase the reliability of the pump unit.

This problem is solved in a pump installation, including a centrifugal pump having a housing with a central hole and an impeller mounted on the motor shaft coaxially with the central hole, a suction pipe connecting the pump through the central hole of the housing with a source of pumped liquid, a pressure pipe for supplying liquid to the consumer, an ejector, installed in the suction pipe and the bypass line connecting

MPKvR04O 15/00

the ejector nozzle with the pump due to the fact that the casing is made with a peripheral hole located on the side of the central hole, and the bypass line is connected to the pump through the peripheral hole of the pump casing, the latter having a second impeller mounted coaxially with the first impeller on the motor shaft .

The drawing schematically shows a pumping unit.

The pump installation includes a centrifugal pump 1 having two impellers 2 and 3 mounted on the shaft 4 of the electric motor 5. A central hole 6 is made along the axis of the impellers 2 and 3 in the pump casing 6 to connect the pump cavity through the suction pipe 7 to a source of pumped liquid. An opening 8 is made in the pump housing for communication with a pressure pipe 9 supplying liquid to a consumer. The pump has a back cover 10, made with a shank 11 and connected by bolts 12 to the electric motor 5. At the front of the back cover there is a seal 13 that isolates the pump cavity from the cavity of the shank 11, which is mounted relative to the shaft 4 on the bearing 14. The described design of the pump back cover and its connection with the electric motor forms a monoblock: pump - electric motor. In the pump casing, from the location of the central hole 6, a peripheral hole 15 is made so that it is in the zone of high pressure created by the impellers of the pump. The end of the bypass line 16 is fixed in the hole 15 of the pump casing, and its other end is connected to the nozzle 17 of the ejector. The ejector is installed in the suction pipe 7 and forms a mixing chamber 18 with it.

The pump installation operates as follows.

When the unit is turned on, the pump pumps the liquid through the suction pipe 7. A part of the water flow flows through the hole 8 into the pipe 9 and is sent to the consumer. Another part of the water falling into the annular flow.

created between the impellers is under additional pressure and enters through the bypass line 16 and then to the ejector nozzle 17, flowing out of which the liquid is mixed with the flow of the suction pipe 7. A vacuum is created above the ejector nozzle 17, which increases the suction pressure. The pump installation provides a rise in water from a depth of up to 50 m.

To facilitate starting the installation into operation in the suction pipe 7 below the location of the ejector can be installed check valve (not shown).

Claims (1)

A pump installation including a centrifugal pump having a housing with a central hole and an impeller mounted coaxially with the central hole on the motor shaft, a suction pipe connecting the pump through the central hole of the housing with a source of pumped liquid, a pressure pipe for supplying liquid to the consumer, an ejector installed in the suction the pipeline and the bypass line connecting the ejector nozzle to the pump, characterized in that the housing is made with a peripheral hole located on the side s location center hole, and a bypass line connected to the pump through a peripheral opening of the pump housing, the latter having a second impeller mounted on the motor shaft coaxially with the first impeller.