RU148779U1 - DEVICE FOR DETERMINING THE CENTRIFUGAL PUMP EFFICIENCY - Google Patents

Abstract

A device for determining the efficiency of a centrifugal pump, comprising a pump with inlet and outlet lines connected to it, a heat-insulated pipeline for removing leaks from the discharge unit with a valve, pressure sensors installed on the inlet and outlet lines and in the pipeline for removing leakage from the discharge unit, temperature sensors installed on the inlet line and on the pipeline for removing leaks from the unloading unit, characterized in that the device further includes a valve in the outlet line, the blocks are compared pressure and temperature control unit, a prohibition unit, a computing device and an indication unit, while the inputs of the pressure and temperature comparison units are connected respectively to pressure sensors on the input and output lines and temperature sensors, the output of the pressure comparison unit is connected to the control unit, and the outputs the control unit and the temperature comparison unit are connected in series with the prohibition unit, the computing device and the display unit.

Description

The utility model relates to power engineering and can be used to assess the technical condition of centrifugal pumps having axle-stress unloading units with regulated leakage of a pumped medium, for example, a hydraulic heel, a drum, in which the pumped-out medium unloads.

A device is known (RU 98501 publ. 20.10.2010), which allows to determine the efficiency of centrifugal pumps, including a pump with an input and output lines connected to it, a heat-insulated pipeline for removing leaks from the unloading unit with a valve, pressure sensors installed on the input and output lines and on the pipeline for removing leaks from the unloading unit, temperature sensors installed on the input line and on the pipeline for removing leaks from the unloading unit.

The disadvantage of the described device is the low accuracy of determining the efficiency, due to the fact that the parameters measured to determine the efficiency depend on the operating mode of the pump.

The objective of the proposed technical solution is to increase the accuracy of determining the efficiency of the pump.

The solution to this problem is achieved by the fact that, according to the known device, including a pump with input and output lines connected to it, a thermally insulated pipeline for removing leaks from the discharge unit with a valve, pressure sensors installed on the input and output lines and on the pipeline for removing leaks from unloading unit, temperature sensors installed on the inlet line and on the pipeline to divert leaks from the unloading unit, the proposed device contains a valve in the outlet line, blocks sra pressure and temperature, control unit, prohibition unit, computing device and display unit, while the inputs of the pressure and temperature comparison units are connected respectively to pressure sensors on the input and output lines and temperature sensors, the output of the pressure comparison unit is connected to the control unit, and the outputs the control unit and the temperature comparison unit are connected in series with the prohibition unit, the computing device and the display unit.

The drawing shows a hydraulic diagram of the proposed device.

The inlet 2 and the outlet 3 of the highway and the pipeline 4 are connected to the pump 1 to drain leaks from the unloading unit. A pressure sensor 5 and a temperature sensor 6 are installed on the inlet pipe 2. A pressure sensor 7 is installed on the output pipe 3. A temperature sensor 8 and a pressure sensor 9 are installed on the pipe 4 to divert leaks from the discharge unit. The pipe 4 is equipped with a valve 10, and the output pipe 3 - valve 11. Pipeline 4 for removing leaks from the unloading unit is connected to the inlet pipe 2. Pipeline 4 for removing leaks from the unloading unit, in order to reduce heat transfer to the environment and, accordingly, reduce the measurement error uu temperature insulated. The outputs of the pressure sensors 5 and 7 are connected in series with the pressure comparison unit 12 and the control unit 14. The outputs of the temperature sensors 6 and 8 are connected with the temperature comparison unit 13. The outputs of the control units 14 and the temperature comparison 13 are connected in series with the inhibition unit 15, the computing device 16 and display unit 17.

The device operates as follows.

The pumped liquid having a pressure of P ₁ and a temperature of T ₁ is supplied to the pump 1, in which it is compressed to a pressure of P ₂ and the temperature rises to T ₂ . Next, the bulk of the pumped liquid is supplied to the outlet line 3, and part of it (1.5-6% for pumps of the TsNS-180 type) after leaving the last stage of the pump in order to balance the axial force acting on the rotor, is sent to the annular gap of the unloading unit formed by the unloading sleeve and the distance sleeve, and then an annular gap between the disk and the ring of the unloading unit.

When the fluid passes through the gap and the slit of the unloading unit, its pressure decreases to the P ₃ isentropic law and its temperature rises to T ₂ . Using valve 10, the pressure equals the pumped liquid in the inlet pipe 2 and pipe 4 to divert leaks from the unloading unit (P ₁ = P ₃ ). The pressure control P ₁ and P _{3 is} carried out using pressure sensors 5 and 9. Using the valve 11 on the input line 2, the nominal value of the pressure drop across the pump 1 is set, the pressure difference P ₁ and P _{2 is} controlled using pressure sensors 5 and 7 and pressure comparison unit 12. At the nominal value of the pressure drop across the pump 1, the control unit 14 provides an enable signal to the inhibit unit 15, allowing the signal to pass from the pressure and temperature comparison units 12 to the computing device 16, where the value is calculated e efficiency according to well-known formulas (SU 1101585, publ. 07/07/1984; Makarov RA, Sholom AM Thermodynamic method for diagnosing hydraulic components. - Construction and road machines, 1979, No. 6 - pp. 20-23. ) The value of the calculated pump efficiency is displayed on the display unit 17.

Efficiency control in order to assess the technical condition of the pump serves to timely determine the time of repair or another type of technical impact, as well as to determine the optimal composition of pumps working on one system. In turn, the timely implementation of technical influences will allow the most complete use of the pump resource and reduce operating costs by reducing the time of non-productive operation of the pump.

Claims (1)

A device for determining the efficiency of a centrifugal pump, comprising a pump with inlet and outlet lines connected to it, a thermally insulated pipeline for removing leaks from the discharge unit with a valve, pressure sensors installed on the inlet and outlet lines and in the pipeline for removing leakages from the discharge unit, temperature sensors installed on the inlet line and on the pipeline for removing leaks from the unloading unit, characterized in that the device further includes a valve in the outlet line, the blocks are compared pressure and temperature control unit, a prohibition unit, a computing device and an indication unit, while the inputs of the pressure and temperature comparison units are connected respectively to pressure sensors on the input and output lines and temperature sensors, the output of the pressure comparison unit is connected to the control unit, and the outputs the control unit and the temperature comparison unit are connected in series with the prohibition unit, the computing device and the display unit.

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