SU1325201A1 - Discharging device for centrifugal pump - Google Patents

Abstract

The invention relates to pump construction and can be used in centrifugal pumps with a recirculation loop. The invention makes it possible to increase reliability by preventing boiling in the draining chamber. In the mode of operation of the pump with a small flow and with the valve 7 open, liquid (G) through the recirculation line 6 enters the discharge chamber 5, Yes-. through the face crack (TESH)., Kame (L with

Description

22 and TShch 21 liquid enters the discharge chamber 9 behind the discharge disk 4, from where it is diverted through line 12 to the deaerator (D). If the frequency of rotation of the vap 3 in chamber 9 increases, the pressure will increase, causing a reduction in TSS 11 formed by point 2 and disk 4, and flow restriction through line 6. When pressure increases to the set limit, sensor 14 sends a signal to controller 15 and opens valve 13, uve

one

 The invention relates to pump construction and can be used in centrifugal pumps with a recirculation loop.

The purpose of the invention is to increase reliability by preventing liquid from boiling up in the discharge chamber.

The drawing shows the discharge device of a centrifugal pump, a longitudinal section.

The unloading device of the centrifugal pump contains a fixed in casing 1 p tu 2 and mounted on the shaft 3 of the pump a discharging disk 4, forming with the casing an unloading chamber 5 communicated by means of a recirculation line 6 with an automatic valve 7 installed on it, and chamber 9 drain connected with a deaerator (not shown) through the pipeline 10,

The unloading chamber 5 and the discharge chamber 9 communicate with each other through an end slot 11 formed by heel 2 and a discharge disk 4. The device is equipped with an additional pipeline 12 with a valve 13 mounted on it, a pressure sensor 14 and a regulator 15. The discharge chamber 9 is additionally communicated with a deaerator through an additional pipeline 12 and the pressure sensor 14 is connected to the discharge chamber 9 and through the regulator 15 to the valve 13. The device is also equipped with a bypass line 16 with throttles 17 and a bypass valve 18 installed between the latter, the temperature sensor 19 and the second regulator of the flow rate of fluid discharged in D. To prevent boiling up in chamber 9, sensor 19 sends a signal to regulator 20, which opens valve 18 and increases the flow of fluid through the bypass port 16 from outlet 8 of the pump to the chamber 22 and through TSC 21 into chamber 9. Of the last M is diverted to D via pipelines 10 and 12. In the chamber 9, the required pressure is maintained, and U1 1 and 21 are increased. 1 hp ff, 1 ill.

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rum 20. The discharge disk 4 is made with a step forming with the housing 1 an additional face slot 21 and an additional discharge chamber 22, the latter being connected by a bypass line 16 with an outlet 8 of the pump. The temperature sensor 19 is connected to the recirculation line 6 and, via the second regulator 20, to the bypass valve 18.

The discharge device of the centrifugal pump operates as follows.

In the low-flow pump operation mode and the open valve 7, the liquid enters the recirculation line 6 into the discharge chamber 5 and through the face slot 11, chamber 22 and slot 21 into the discharge chamber 9 behind the discharge disk 4, from where in the deaerator. When the frequency of rotation of shaft 3 increases, the temperature of the liquid increases, which can lead to boiling up and, accordingly, pressure in chamber 9, which causes a reduction in the face gap 11 and restriction of flow through the recirculation line 6.

However, when the pressure in the discharge chamber 9 reaches the set limit, the pressure sensor 14 sends a signal to the regulator 15 and opens the valve-13 on the pipeline 12, increasing the flow rate of the liquid discharged to the deaerator, thereby preventing an increase in pressure in the discharge chamber 9. For prevent the liquid from boiling up in the discharge chamber 9 while increasing its volume

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Temperature sensor 9 sends a signal to controller 20, which

opens valve 18 and increases the flow of fluid through bypass line 16

from the outlet 8 of the pump into the chamber 22 and through the face slot 21 into the discharge chamber 9, from where the liquid is discharged to the deaerator through lines 10 and 12. This prevents boiling up of the liquid in chamber 9 and maintains the required pressure in it, and the end slots 11 and 12 increase.

The flow of fluid through the bypass line 16 provides a more substantial increase in the recycling rate. A device according to claim 1, characterized by the fact that it is equipped with a bypass line with throttles and a relief valve installed between the latter, a temperature sensor and a second regulator, the discharge disk is made with a shoulder forming an additional face with the body a slot and an additional unloading chamber, the latter being connected by a bypass line to the pump outlet, and a temperature sensor connected to the recirculation line and via a second regulator to the bypass valve.

Compiled by L. Anisimov. Editor S. Patrushev Tehred A. Kravchuk Order 3033/31 Circulation 574

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

stroke due to the reduced pressure in the chamber 22 compared with the pressure in the chamber 5.

Claims (1)

1. An unloading device for a centrifugal pump, containing a fifth mounted in the casing and mounted on the pump shaft, a discharge disk that forms with the casing an unloading chamber communicated through a recirculation line with an automatic valve installed on it with a pump outlet, and a discharge chamber communicated with by means of a piping through an azrator, the discharge chamber and the discharge chamber communicating with each other by means of an end slit formed by a fifth and discharge disc, characterized in that reliability by preventing liquid from boiling up in the drain chamber, the device is equipped with an additional pipeline with a valve installed on it, a pressure sensor and a regulator, the drain chamber is additionally communicated with the deaerator through an additional pipeline, and the pressure sensor is connected to the drain chamber and through the regulator to the valve. Proofreader L. Pilipenko Subscription