RU222187U1 - Test bench for oil gear pumps - Google Patents

Abstract

The utility model relates to mechanical engineering (special military equipment), namely to test benches for oil gear pumps of the hydraulic transmission system of combat vehicles (T-80 tank, armored repair and recovery vehicle).

The test bench for oil gear pumps contains a direct current drive with a drive shaft for connecting the shaft of the pump being tested to it, a hydraulic system with a hydraulic tank inside which heating elements are mounted, a control panel with pressure gauges placed on it indicating the pressure in the hydraulic system lines, a device, showing the oil heating temperature, tachometer, “Network” light, filters for the hydraulic oil supply system in the lines. The stand contains pressure and vacuum gauges for monitoring vacuum pressure in a rarefied environment at the pump inlet, a “Heating” button, load valve flywheels, an “Oil level” light, a switch for selecting the position of checking the flow rate of the injection and pumping sections, two safety valves, two load valves for creating pressure, an additional pumping line, including a connection between the pump pump sections and the pipeline, two turbine flow meters, designed to monitor the performance of one injection and three pump sections.

The technical result is to ensure the versatility of the stand, allowing testing of gear oil pumps of different types, which have one injection section and one, two or three pumping sections, allowing measurements of vacuum pressure in a rarefied environment at the inlet to the gear pump. 3 ill.

Description

The utility model relates to mechanical engineering (special military equipment), namely to test benches for oil gear pumps of the hydraulic transmission system of combat vehicles (T-80 tank, armored repair and recovery vehicle).

A known stand for testing oil pumps of an internal combustion engine (RU No. 184856 U1, IPC G01M 15/00 2006.01, published 11/12/2018), containing a base on which the pump being tested is installed, an electric motor with a drive shaft for connecting the pump being tested to it, an oil bath with oil intake, hydraulic system. The hydraulic system of the stand consists of a filter, a drain tank, a heat exchanger, a circulation pump, a suction hydraulic line, a pressure hydraulic line with connectors for connecting to the holes of the pump being tested, a drain hydraulic line, and an adjustable throttle for the pressure of the working fluid in the pressure hydraulic line. Means for determining the performance of the oil pump under test include temperature sensors, pressure sensors, a rotation speed sensor, a flow meter for measuring fluid flow installed on the pressure hydraulic line and a thermostat with a relay for heating the fluid. The oil bath with an oil intake is equipped with a temperature sensor, pressure sensor, and liquid level sensor.

A known stand for testing oil gear pumps and full-flow oil centrifuges (RU 2 290 538 C1, IPC F04C 2/08 2006/01, G01M 15/00 2006.01 published 12/27/2006), containing a drive shaft for connecting the pump being tested to it, a hydraulic system , having a hydraulic tank, a suction hydraulic line, the inlet of which is connected to the hydraulic tank, and the output is intended for connection to the inlet of the pump under test, a pressure hydraulic line, the inlet of which is intended to be connected to the outlet of the pump under test, a drain hydraulic line for returning the working fluid to the hydraulic tank. Means for determining the performance of the pump being tested include a shaft speed sensor for the pump being tested and a liquid meter. The hydraulic system is equipped with an adjustable throttle to regulate the pressure of the working fluid in the pressure hydraulic line.

The disadvantage of the above stands is their limited use. The stands do not allow testing of gear pumps having three or four sections: one injection section and two or three pumping sections, due to the lack of lines to connect the pumping section. The stands also do not allow measuring vacuum pressure in a rarefied environment at the inlet to the gear pump.

As a prototype, an oil pump testing stand was selected (URL: http://www.dizob.ru/ispytmn.html), containing a gearbox flange on which the pump under test is installed and connected via an intermediate shaft to the stand spindle driven by a DC electric motor , tachometer, oil supply cam. The gearbox housing is connected to the supply tank and both pumping sections of the oil pump are fed with oil from the gearbox housing. The oil from the gearbox flows through the hole in the pulley into the drain tank. The pressure section of the oil pump is fed from the supply tank via a flexible hose. From the pumping sections, oil is supplied through a tap to the supply tank; From the discharge section, oil through a tap, filter and then a three-way tap, depending on the position, enters the supply tank or measuring tank. The oil supply switching mechanism consists of a cam, a pawl, a spring, a drive lever with a handle and a driven lever that drives a three-way valve. Using the oil indicator, you can determine the performance of the discharge section of the pump. The valve serves to drain oil from the measuring tank. A three-phase electric heater is installed inside the supply tank; the oil is heated to 100°C. A tachometer is installed on the control instrument panel; a thermometer, a pressure gauge indicating the pressure in the discharge pipe of the discharge section, and a pressure gauge recording the pressure in the discharge pipe of the suction section.

The disadvantage of the prototype is its limited application. The stand does not allow testing gear pumps with two or four sections: one injection section and one or three pumping sections, due to the lack of a line to connect an additional pumping section and the lack of technical ability to disconnect one of the two existing pumping lines. The stand also does not allow measuring vacuum pressure in a rarefied environment at the inlet to the gear pump.

The technical result is to ensure the versatility of the stand, allowing testing of gear oil pumps of different types, which have one injection section and one, two or three pumping sections, allowing measurements of vacuum pressure in a rarefied environment at the inlet to the gear pump.

Declared technical result is achieved due to the fact that the pump testing stand contains a hydraulic system having one injection hydraulic line, the input of which is connected to the hydraulic tank, and the output is intended to be connected to the pump, three pumping hydraulic lines, the inputs of which are connected to the pump under test, and the outputs to the hydraulic tank. The hydraulic system is also equipped with three measuring instruments (pressure and vacuum gauges) for measuring vacuum pressure in a rarefied environment at the inlet to the pump.

Analysis of distinctive features showed the following:

- the presence in the hydraulic system of two load valves for creating pressure, an additional pumping line, including the connection of the pump pump sections with a pipeline, a switch for selecting the position for checking the flow rate of the pumping and pumping sections, makes it possible to test different types of gear oil pumps that have one pumping section and one, two or three pumping sections;

- the presence of pressure and vacuum gauges in the hydraulic system provides the ability to carry out the tests required by regulations to control vacuum pressure in a rarefied environment at the inlet of different types of gear oil pumps;

- the presence of two flow meters as part of the turbine hydraulic system provides the ability to carry out the fluid flow measurements required by regulations in the injection section and pumping sections for a certain period of time in pumps of different types;

The essence of the utility model is illustrated by drawings, where:

in fig. 1 – test bench for oil gear pumps, front view;

in fig. 2 – stand for testing oil gear pumps, side view;

in fig. 3 – hydraulic diagram of a test bench for testing oil gear pumps.

The test bench for oil gear pumps contains a DC drive with a drive shaft 1, a hydraulic tank 18 and a control panel 2. Heating elements are mounted inside the hydraulic tank 18. Control panel 2 is a welded structure, on a vertical plate of which there are pressure gauges 3, 4, a device showing the heating temperature of the oil 5, pressure and vacuum gauges 6, 7, 8, turbine flow meters 9, 10, a tachometer revolution counter 11, a “Heating” button 12, load valve flywheels 13, 14, “Network” light 15, “Oil level” light 16, switch 17. Heating elements are mounted inside the hydraulic tank 18. The control panel and hydraulic tank are installed on a common stand 19. The pump testing stand contains a hydraulic system, including a hydraulic tank 18, valves 20, 21, 22, 23, 24, pressure and vacuum gauges 6, 7, 8, turbine flow meters 9, 10, filters 26, 27, safety valves 28, 29, load valves 30, 31, pressure gauges 3, 4, breather 32, filler filter 33.

Testing of pumps on a bench is carried out as follows.

Connect and secure the tested pump 25. Check the oil level in the hydraulic tank 18. If necessary, top it up. Open oil supply valves 20, 21, 22, 23, 24 to the tested pump 25. Start the DC drive with drive shaft 1 using a switch (not shown in the drawing). If the stand is in good condition, the “Network” light 15 on the vertical control panel 2 lights up. By pressing the “Heating” button 12, the oil heating system is turned on. When the required temperature is reached, you can begin testing the pump. Temperature control and regulation is carried out automatically. The temperature of the oil in the tank is shown by device 5 located on the vertical panel 2 of the stand.

The debugging process is carried out: the safety valve 28 of the discharge section is adjusted to the required pressure as follows: the load valve 30, the flywheel 13 of which is located on the vertical panel of the stand, is completely closed. The setting pressure will be shown by pressure gauge 3. Safety valve 29 of the pumping section is adjusted to the required pressure, to do this, completely close the load valve 31, the flywheel 14 of which is also located on the vertical panel. Start the pump. The setting pressure is shown by pressure gauge 4.

The pump is run-in with oil and the performance of both sections of the pump is tested: the required number of revolutions of the pump shaft is set using instrument 11, valves 30, 31 create the required pressure, and after the required time the pump 25 is turned off.

The performance of both sections of the pump is tested: pump 25 is started, the required number of revolutions of the pump shaft is set using the device 9 with valves 30, 31 to create the required pressure. Set switch 17 to the “Pumping” position and, according to the readings of device 9, determine the flow rate of the pumping section of the pump; set switch 17 to the “Pumping” position, and use the readings of device 10 to determine the flow rate of the pump pump sections. The measurements are repeated at all shaft speeds and pressures required for testing.

The vacuum in the suction chamber of pump 25 is checked while oil is pumped out from the suction lines: shut off valves 20, 21, 22, 23, 24 on the suction lines of pump 25, open valves 30,31 on the suction lines, connecting them to the atmosphere, start pump 25 Set the frequency to the required number of revolutions of the pump shaft using instrument 9, while monitoring the readings of the vacuum pressure in the rarefied medium at the pump inlet using pressure and vacuum gauges 6, 7, 8. Stop the DC drive with drive shaft 1, the arrows of the indicating instruments should be at zero marks . Disconnect the lines and remove the pump under test 25.

Thus, the stand is universal and allows testing different types of gear oil pumps.

Claims (1)

A test bench for testing oil gear pumps, containing a DC drive with a drive shaft for connecting the shaft of the pump being tested to it, a hydraulic system with a hydraulic tank inside which heating elements are mounted, a control panel with pressure gauges placed on it indicating the pressure in the lines of the hydraulic system, a device showing the temperature of the oil heating, a tachometer, a “Network” light, filters for the hydraulic oil supply system in the lines, characterized in that the stand contains pressure and vacuum gauges to control the vacuum pressure in the discharged environment at the pump inlet, a “Heating” button, load valve flywheels, an “Oil level” light, a switch for selecting the position for checking the flow rate of the injection and pump-out sections, two safety valves, two load valves for creating pressure, an additional pumping line, including a connection between the pump-out sections of the pump and the pipeline, two turbine flow meters, designed to be monitored productivity of one injection and three pumping sections.