SU1168816A1 - Test bed for testing temperature-sensitive valves - Google Patents

Abstract

STAND FOR TESTING OF SUSPENSIVE CLANES, containing a supply tank with a working fluid, connected through a valve and filter with a pipeline to a pump, in the discharge line of which the valves are connected, connected to the control and heating and cooling control units, with control valves, connected to the control and heating and cooling control units, with a valve connected to the control and heating and cooling units, with a valve connected to the control and heating and cooling units. In order to expand the functionality by increasing the temperature range of the regulation, a mixer and heating and cooling units are installed behind the pump in the delivery line By connecting in parallel to the mixer through control valves, and in each block before the mixer temperature sensors are mounted, is electrically associated with the unit controlling the heating and cooling, wherein in the supply tank has a heater and a refrigerator, snabzhennsh temperature sensor connected to the regulating unit (A Vani,

Description

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05 11 The invention relates to bench devices for testing thermosensitive valves and fuel control valves, namely, stands for cyclic life test at elevated temperatures. . The purpose of the invention is to expand the functionality by installing a mixer downstream of the pump, in which the working fluids, preheated, and cooled in the heating and cooling units and in the supply tank are mixed. The drawing is a schematic diagram of a test bench for thermo-sensitive valves. The stand contains a supply tank 1 with a working fluid, connected by a pipe 2 through a valve 3 and a filter with a pump 5, in the discharge pipe 6 of which the control valves (valves 7-9) connected to the control unit 10 and the mixer 11 are installed, to which the heating units 12, cooling 13 and displacement 14 are connected in parallel via shut-off control valves 9, and temperature sensors 15-17 electrically connected to the heating and cooling control unit 18 are installed in front of the mixer. In the supply tank 1, a heater 19 and a cooler 20 are placed, equipped with a temperature sensor 21 connected to a control unit. The output of the mixer 11 through the filter 22, control valves 23 and 24, the flow meters 25 and 26 and the shut-off valve 27 are connected to the inlet of the thermosensitive valve under test 28. A hydroaccumulator 29 is installed to smooth the pressure pulsations in the discharge line through the throttle valve 30 is connected to the discharge valve line 31 with a supply tank 1. The stand contains additionally two technical circuits consisting of pressure 32 and drain 33 and 34 pipelines connected through adjustable throttles 35 and 36 with a supply tank 1. Control detecting hydraulic fluid temperature and inlet temperature sensing valve 28 is carried out gauges 37 and 38 and temperature sensor 39. The stand works as follows. Before starting the test of the thermosensitive valve 28, 6 s of the working fluid is heated in the heating unit 12 and, accordingly, cooled in the unit 13 and in the supply tank 1. The test of the valve 28 consists in cyclic exposure of the working fluid at a constant flow rate in the temperature range from -70 to + 120 ° C, varying at a given speed. To heat the fluid in block 12, valve 7 and control valves 23 and 24 are shut off, and technological circuits 32 and 33 through control throttle 35 and valve 3 are pumped by pump 5. During the pumping process, the liquid is heated in block 12, which was turned on control unit 10. The heating rate is regulated with the help of droplets 35, and when the set temperature is reached by a signal from the temperature sensor 15, the control unit 18 turns off the heating unit 12, and in the future the temperature of the working fluid is kept constant (+ 120 ° C). To cool the working fluid (to -70 ° C) in the supply tank 1 and cooling unit 13, valve 7 and adjustable throttle 35 are closed, and valve 3 and valves 8 and 9 are opened, resulting in process circuits 32 and 34 and throttle 35 the pumping of the fluid by the pump 5 and its cooling in the cooling unit 13 and the tank 1 is carried out. In order to avoid overcooling the working fluid in the supply tank 1, the heater 19 is periodically turned on. When the set temperature 18 is reached, the control by the signals of the sensors 16, 17 and 21 turns off flushes the cooling unit 13 and the refrigerator 20 in the supply tank 1 and enters an automatic mode to maintain the liquid temperature (-70 ° C) in the cooling unit 13. After obtaining a predetermined temperature of the fluid in the technological circuits of the valves 3, 23 and 24, the throttle 35 and the control valves 8 and 9 are closed, the pumps 5 are turned off. The thermosensitive valve 28 under test is installed and the valve 3, valve 9, control valves 23 and 24 (depending on

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flow rate) and the throttle valve 30, the temperature sensible test subject is switched on. the tel valve 28. The throttle valve 30 is set to the test mode set: operating pressure, fluid flow controlled by gauges 37 and 38 and flow meters 25 and 26. The commands issued from unit 10 set the operating temperature of the fluid with the control valve 9 fully open control valves 7 and 8 are closed, and block 10 is switched to automatic mode. In the test process, unit 10 maintains a given rate of heating of the working fluid. The change in the overall heat balance of the stand hydraulic system, which provides the necessary temperature, is achieved by heat generation of the stand itself and throttling or the flow of working fluid through the cooling unit 13 and the diversion tank 1.

In case the temperature of the working fluid becomes lower than the preset value, the unit 10, by the signal of the temperature sensor 39, initiates a command by which the control valve 9 closes and the valve 7 opens,

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as a result, part of the Ncet fluid through the heating unit 12 is heated therein and in the mixer 11 is mixed with the main flow, which leads to an increase in the temperature of the fluid entering the test valve 28. Valves 7 and 9 remain in the open position until the next command. If the working temperature

liquid above the test programmed value, then block 10, according to a signal from sensor 39, causes a signal: to close the control valve 7 and open the valve 9, as a result

as a result, the flow of fluid through valve 7 decreases and, accordingly, its temperature at the inlet to test valve 28 decreases.

When the temperature reaches

The set point fluids valves 7 and 9 remain in a predetermined position until the next signal from block 10 arrives. At the end of the test program, block 10 outputs a signal on which

valves 7, 8 are closed and valve 9 is turned off.

After testing a specified number of cycles on the signal of block 10, the valves 7 - 9 are closed and

pump shutdown 5.

Claims (1)

STAND FOR TESTING THERMOSENSITIVE VALVES, comprising a supply tank with working greed, connected through a valve and filter to a pump, in the discharge line of which there is a shut-off and control valve connected with control and regulation units for heating and cooling, which is controlled by that, in order to expand functionality by increasing the temperature range of regulation, a mixer and heating units are installed behind the pump in the discharge line; VA and cooling, which are connected to the mixer in parallel through control valves, and in each block in front of the mixer there are temperature sensors electrically connected to the heating and cooling control unit, and in the supply tank there is a heater and a refrigerator equipped with a temperature sensor connected to the control unit. · SU .... 1168816