Evaporator high-altitude performance test device and test method

Abstract

The application discloses an evaporator high-altitude performance test device and a test method. The device comprises a vacuum cabin, a vacuum pump unit, a lubricating oil circulation loop, a water vapor condensing branch and a condensing water circulation loop. The vacuum pump unit draws the inside of the evaporator to be tested and the vacuum cabin to a specified pressure value, then the lubricating oil is heated to a specified value, the electromagnetic valve of the lubricating oil circulation loop is opened, and the lubricating oil flow is adjusted to a specified value. The lubricating oil entering the hot side cavity of the evaporator to be tested heats the water in the cold side cavity of the evaporator to be tested to become gaseous, and carries away part of the heat of the lubricating oil. The condensing water circulation loop is opened, the steam enters the cooling device to condense into liquid water into the water storage tank, until the water in the evaporator is completely evaporated, the test is completed. The application has the advantages of high automation degree, stable parameters, high measurement accuracy, good pipeline sealing, high cleanliness, simple operation, high safety and the like, and meets the high-altitude performance test requirements of various evaporators.

Description

Technical Field

[0001] This invention relates to high-altitude performance testing equipment for evaporators, belonging to the field of fluid testing technology. Background Technology

[0002] Today, fighter jet technology has developed to a new generation. Fighter jets, which represent the most advanced level in the world today, have adopted the latest achievements in the field of aviation technology. Based on this, the airborne electromechanical systems developed are moving towards integration, unification, and intelligence. As a typical airborne electromechanical system, the environmental control system is also undergoing a profound technological leap.

[0003] With the increasing avionics and heat load of modern fighter jets, the demand for cooling in environmental control systems is also growing. From the perspective of airborne environmental control systems, the coefficient of performance (COP) of airborne evaporative cooling systems (VCS) is significantly higher than that of traditional air circulation systems. VCS also offers advantages such as low compensatory losses and the elimination of engine bleed air. Therefore, evaporative cooling systems are widely used in modern fighter jets and helicopters. The most basic components involved in an evaporative cooling system include: evaporator, condenser, compressor, expansion valve, and electronic equipment. The evaporator, as a key component in the evaporative cooling system, plays a crucial role in the stable operation of the system. As a heat exchanger, the evaporator utilizes the property that water has a low boiling point under negative pressure and readily evaporates to absorb heat, thus carrying away the heat from the cooling medium. Therefore, the better the evaporator's performance, the more heat it can remove from the cooling medium, which is more beneficial for cabin temperature control.

[0004] Therefore, it is necessary to design an evaporator high-altitude performance testing device that can simulate the evaporator under different high-altitude pressures in the laboratory, conduct performance tests on the evaporator, obtain accurate test data, and evaluate the performance of the evaporator. Summary of the Invention

[0005] The present invention aims to provide an evaporator high-altitude performance testing device and method to meet the high-altitude performance testing requirements of various existing evaporators.

[0006] This invention is achieved through the following technical solution:

[0007] Evaporator high-altitude performance testing apparatus, including,

[0008] The vacuum chamber includes a cavity for placing an evaporator to be tested. The vacuum chamber is also equipped with a first pressure transmitter and a first temperature transmitter for the evaporator to be tested, as well as a second pressure transmitter and a second temperature transmitter for the vacuum chamber.

[0009] A vacuum pump unit, comprising a first vacuum pump unit connected to the evaporator to be tested, and a second vacuum pump unit connected to the vacuum chamber cavity;

[0010] The lubricating oil circulation loop is connected in sequence to a third solenoid valve, a fifth temperature transmitter, a third pressure transmitter, a second flow meter, a lubricating oil pump, a fully automatic heated oil tank, a sixth temperature transmitter, and a second solenoid valve. The third solenoid valve serves as the lubricating oil outlet and is connected to the inlet of the hot side cavity of the evaporator to be tested inside the vacuum chamber. The second solenoid valve serves as the lubricating oil return and is connected to the outlet of the hot side cavity of the evaporator to be tested inside the vacuum chamber.

[0011] A water vapor condensation branch is provided, in which a cooling device, a water storage tank, and a first solenoid valve are connected in sequence. The water storage tank is connected to the hot side medium outlet end of the cooling device, and the first solenoid valve is located at the condensate outlet end of the water storage tank.

[0012] The condensate circulation loop is connected in sequence to a fourth temperature transmitter, a water tank, a water pump, a first flow meter, and a third temperature transmitter. The fourth temperature transmitter is installed on the return water pipe connected to the cold side medium outlet of the cooling device, and the return water pipe is connected to the water inlet of the water tank. The third temperature transmitter is installed on the inlet water pipe connected to the cold side medium inlet of the cooling device.

[0013] Alternatively, the vacuum chamber is also equipped with a gas replenishment valve that communicates with the cavity.

[0014] Alternatively, the lubricating oil circulation loop is also equipped with a first coarse filter, a second coarse filter, and a precision filter. The first coarse filter is located between the oil return port of the fully automatic heated oil tank and the second solenoid valve, the second coarse filter is located between the oil outlet of the fully automatic heated oil tank and the lubricating oil pump, and the precision filter is located between the second coarse filter and the lubricating oil pump.

[0015] Alternatively, a filter is also provided on the condensate circulation loop, and the filter is connected to the outlet of the water tank.

[0016] The method for testing the high-altitude performance of an evaporator uses the aforementioned test apparatus and includes the following steps:

[0017] Step 1: The first vacuum pump unit evacuates the evaporator to be tested to a specified pressure value, and the second vacuum pump unit evacuates the vacuum chamber to a specified pressure value.

[0018] Step 2: After starting the fully automatic heating oil tank and heating the lubricating oil to the specified value, open the third and second solenoid valves in the lubricating oil circulation loop, start the lubricating oil pump, and adjust the lubricating oil flow rate to the specified value. The lubricating oil circulates in the hot side cavity of the evaporator to be tested in the vacuum chamber and heats the cold side cavity of the evaporator to be tested. The water in the heated cold side cavity of the evaporator to be tested turns into gas, which takes away some of the heat from the lubricating oil.

[0019] Step 3: Start the condensate circulation loop. After the water vapor in the cold side cavity of the evaporator under test enters the cooling device, it will condense into liquid water and enter the water storage tank. Continue until the water in the cold side cavity of the evaporator under test is completely evaporated. Record the evaporation time of the water in the cold side cavity of the evaporator under test and the temperature difference between the inlet and outlet lubricating oil in the hot side cavity of the evaporator under test.

[0020] Compared with the prior art, the evaporator high-altitude performance testing device and method of the present invention have the following characteristics:

[0021] (1) In the test method of this invention, firstly, the vacuum pump unit is used to evacuate the inside of the evaporator and the vacuum chamber to a specified pressure value. Then, the fully automatic heating oil tank is run to heat the lubricating oil to a specified value. After that, the solenoid valve of the lubricating oil circulation loop is opened, the oil pump is started, and the flow rate of the lubricating oil is adjusted to a specified value. The water in the evaporator is heated by the lubricating oil and turns into a gaseous state, which carries away some of the heat from the lubricating oil. The condensate circulation loop is opened, and after the vapor enters the cooling device, it condenses into liquid water and enters the water storage tank until the water in the evaporator is completely evaporated, thus completing the test.

[0022] (2) The test device of the present invention has precise flow control, real-time acquisition function for various test data, and can be printed at any time. The test device of the present invention has the advantages of high automation, stable test parameters, high test measurement accuracy, good pipeline sealing, high cleanliness, simple test operation, and strong safety, and perfectly realizes the monitoring and adjustment of the test working status. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the performance testing device of the present invention;

[0024] In the diagram, 1-First vacuum pump unit; 2-Second vacuum pump unit; 3-First pressure transmitter; 4-Second pressure transmitter; 5-First temperature transmitter; 6-Maintenance valve; 7-Vacuum chamber; 8-Second temperature transmitter; 9-Cooling device; 10-Third temperature transmitter; 11-First flow meter; 12-Water pump; 13-Fourth temperature transmitter; 14-Filter; 15-Water tank; 16-First solenoid valve; 17-Water storage tank; 18-Second solenoid valve; 19-Third solenoid valve; 20-Fifth temperature transmitter; 21-Sixth temperature transmitter; 22-Third pressure transmitter; 23-First coarse filter; 24-Second flow meter; 25-Lubricating oil pump; 26-Precision filter; 27-Second coarse filter; 28-Fully automatic heated oil tank. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. However, it should not be construed that the scope of the subject matter of the present invention is limited to the following embodiments. All modifications, substitutions and alterations made based on ordinary technical knowledge and conventional means in the art without departing from the above-described technical concept of the present invention are included within the scope of the present invention.

[0026] The evaporator includes a hot side chamber and a cold side chamber. In this invention, heated lubricating oil is circulated into the hot side chamber of the evaporator through a lubricating oil circulation loop to exchange liquid-liquid heat with water in the cold side chamber of the evaporator.

[0027] like Figure 1 As shown, the high-altitude performance test device for evaporators mainly consists of a first vacuum pump unit 1, a second vacuum pump unit 2, a first pressure transmitter 3, a second pressure transmitter 4, a first temperature transmitter 5, a make-up air valve 6, a vacuum chamber 7, a second temperature transmitter 8, a cooling device 9, a third temperature transmitter 10, a first flow meter 11, a water pump 12, a fourth temperature transmitter 13, a filter 14, a water tank 15, a first solenoid valve 16, a water storage tank 17, a second solenoid valve 18, a third solenoid valve 19, a fifth temperature transmitter 20, a sixth temperature transmitter 21, a third pressure transmitter 22, a first coarse filter 23, a second flow meter 24, a lubricating oil pump 25, a precision filter 26, a second coarse filter 27, a fully automatic heated oil tank 28, and an electrical control console, among other components.

[0028] The vacuum chamber 7 includes a cavity for placing the evaporator to be tested. The vacuum chamber 7 is also equipped with a first pressure transmitter 3 and a first temperature transmitter 5 for the evaporator to be tested (monitoring the temperature when the water in the cold side wall of the evaporator exchanges heat with the lubricating oil in the hot side cavity under negative pressure and boils), as well as a second pressure transmitter 4 and a second temperature transmitter 8 for the vacuum chamber (monitoring the ambient temperature of the vacuum chamber 7). The vacuum chamber 7 is also equipped with a gas supply valve 6 that communicates with the cavity.

[0029] The vacuum pump unit includes a first vacuum pump unit 1 connected to the evaporator to be tested, and a second vacuum pump unit 2 connected to the vacuum chamber 7.

[0030] The lubricating oil circulation loop is sequentially connected to the third solenoid valve 19, the fifth temperature transmitter 20, the third pressure transmitter 22, the second flow meter 24, the lubricating oil pump 25, the fully automatic heated oil tank 28, the sixth temperature transmitter 21, and the second solenoid valve 18. The third solenoid valve 19 serves as the lubricating oil outlet and is connected to the inlet of the hot side cavity of the evaporator to be tested inside the vacuum chamber. The second solenoid valve 18 serves as the lubricating oil return and is connected to the outlet of the hot side cavity of the evaporator to be tested inside the vacuum chamber. The lubricating oil circulation loop is also equipped with a first coarse filter 23, a second coarse filter 27, and a precision filter 26. The first coarse filter 23 is located between the return port of the fully automatic heated oil tank 28 and the second solenoid valve 18. The second coarse filter 27 is located between the outlet of the fully automatic heated oil tank 28 and the lubricating oil pump 25. The precision filter 26 is located between the second coarse filter 27 and the lubricating oil pump 25.

[0031] The water vapor condensation branch is connected in sequence to the cooling device 9, the water storage tank 17, and the first solenoid valve 16. The water storage tank 17 is connected to the hot side medium outlet end of the cooling device 9, and the first solenoid valve 16 is located at the condensate outlet end of the water storage tank 17. It should be noted that the cooling device 9 is a heat exchanger in the general sense. High-temperature water vapor from the cold side cavity of the evaporator under test enters the hot side channel of the cooling device 9 as the hot side medium, while low-temperature liquid water from the condensate circulation loop enters the cold side channel of the cooling device 9 as the cold side medium, thereby realizing the heat exchange between the cold side medium and the hot side medium.

[0032] The condensate circulation loop is sequentially connected to a fourth temperature transmitter 13, a water tank 15, a water pump 12, a first flow meter 11, and a third temperature transmitter 10. The fourth temperature transmitter 13 is installed on the return water pipe connected to the cold side medium outlet of the cooling device 9, and the return water pipe is connected to the inlet of the water tank 15. The third temperature transmitter 10 is installed on the inlet water pipe connected to the cold side medium inlet of the cooling device 9. A filter 14 is also installed on the condensate circulation loop, and the filter 14 is connected to the outlet of the water tank 15.

[0033] As an alternative, the nominal volumetric flow rate of the first vacuum pump unit 1 and the second vacuum pump unit 2 is 35.4 m³ / s. 3 / min, rated working pressure 23.4 Torr.

[0034] The test principle of the above-mentioned test device is as follows: The vacuum pump unit evacuates the interior of the evaporator under test and the vacuum chamber 7 to a specified pressure value. Then, the fully automatic heating oil tank 28 is run to heat the lubricating oil to a specified value. After that, the solenoid valve of the lubricating oil circulation loop is opened, and the lubricating oil pump 25 is started. The flow rate of the lubricating oil is adjusted to a specified value through the second flow meter 24. The lubricating oil entering the hot side cavity of the evaporator under test heats the water in the cold side cavity of the evaporator under test, turning it into a gaseous state and carrying away some of the heat from the lubricating oil. The condensate circulation loop is opened, and the vapor enters the cooling device 9, condenses into liquid water, and enters the water storage tank 15. The test ends when the water in the cold side cavity of the evaporator is completely evaporated.

[0035] The aforementioned test apparatus and method can easily control the vacuum pump unit, lubricating oil pump 25, water pump 12, and solenoid valves, such as adjusting the vacuum pump pressure, regulating the flow rates of lubricating oil pump 25 and water pump 12, and starting and stopping the second solenoid valve 18 and the third solenoid valve 19. Test data from each electrical instrument can be stored and printed in real time, providing convenience and speed. The test apparatus has a reasonable and aesthetically pleasing layout, a user-friendly control panel interface, and easy-to-operate function settings.

[0036] During the formal test, after turning on the electrical control panel, the values ​​of all electrical instruments and equipment are displayed on the human-machine interface of the control panel to check for any abnormal data. The first vacuum pump unit 1 is started to evacuate the evaporator under test to a specified negative pressure value, while the second vacuum pump unit 2 evacuates the vacuum chamber 7 to a specified negative pressure value. The heating button of the fully automatic heated oil tank 28 is activated to heat the lubricating oil to a specified temperature and maintain it. Simultaneously, the water pump 12 is turned on, and the condensate flow rate is adjusted to a specified value to initiate the condensate circulation loop self-circulation. After the lubricating oil temperature reaches the specified value, the third solenoid valve 19 at the inlet and the second solenoid valve 18 at the outlet of the lubricating oil circulation loop are opened, and the lubricating oil pump 25 is started to adjust the lubricating oil flow rate to a specified value, and the loop begins self-circulation operation. At this time, the water in the cold side chamber of the evaporator under test has a lower boiling point, and the heat transfer of the lubricating oil causes the water to evaporate into a gaseous state, carrying away some of the heat from the lubricating oil. Water vapor travels along the condensation branch to the cooling device 9, where it condenses into liquid water and is stored in the water tank 17. This continues until all the water in the cold side cavity of the evaporator under test has evaporated. The evaporation time of the water in the cold side cavity of the evaporator under test and the temperature difference between the inlet and outlet of the hot side cavity of the evaporator under test are recorded, i.e., the temperature difference between the fifth temperature transmitter 20 and the sixth temperature transmitter 21, which are used to evaluate the high-altitude performance of the evaporator.

[0037] After the test, first stop the fully automatic heating oil tank 28 and lubricating oil pump 25, then turn off the water pump 12 and open the air supply valve 6 to return the vacuum chamber 7 to normal pressure. Open the first solenoid valve 16 to allow the water in the water storage tank 17 to flow into the water tank 15. Finally, disassemble the evaporator according to the test operation procedure and check for any defects.

[0038] In this embodiment, the test method of the evaporator high-altitude performance test device is as follows:

[0039] Step 1: Turn on the power to the electrical control console, open the human-machine interface, and check whether the parameters of various electrical instruments and equipment are normal.

[0040] Step 2: Set the test pressure value, start the operation buttons of the first vacuum pump unit 1 and the second vacuum pump unit 2, and start automatic vacuuming until the specified pressure value is reached;

[0041] Step 3: Set the heating temperature of the fully automatic heating oil tank 28, press the run button, and the fully automatic heating oil tank 28 will start to heat automatically and reach the specified test temperature value;

[0042] Step 4: Set the speed of water pump 12, start water pump 12, and adjust the condensate flow rate to the specified value through the first flow meter 11;

[0043] Step 5: Open the inlet and outlet solenoid valves of the lubricating oil circulation loop (i.e., the second solenoid valve 18 and the third solenoid valve 19), start the lubricating oil pump 25, and adjust the lubricating oil flow rate to the specified value through the second flow meter 24 to perform self-circulation of the lubricating oil circulation loop. After the lubricating oil enters the hot side cavity of the evaporator to be tested in the vacuum chamber 7, it heats the water in the cold side cavity of the evaporator to be tested. The water in the cold side cavity of the evaporator to be tested then begins to evaporate, exchanging heat. After evaporation, the water enters the cooling device 9 and condenses into liquid water, which then enters the water storage tank 17.

[0044] Step 6: Organize the test bench, print the test data, and turn off the power to the test bench.

[0045] The above embodiments are not intended to limit the scope of protection of the present invention. Any modifications, alterations or equivalent substitutions made based on the technical solutions of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A method for testing the high-altitude performance of an evaporator, characterized in that: The high-altitude performance testing apparatus for evaporators used includes, Vacuum chamber (7), the vacuum chamber (7) includes a cavity for placing the evaporator to be tested, the vacuum chamber (7) is also provided with a first pressure transmitter (3) and a first temperature transmitter (5) for the evaporator to be tested, and a second pressure transmitter (4) and a second temperature transmitter (8) for the vacuum chamber (7). The vacuum pump unit includes a first vacuum pump unit (1) connected to the evaporator to be tested, and a second vacuum pump unit (2) connected to the vacuum chamber (7). The lubricating oil circulation loop is connected in sequence to the third solenoid valve (19), the fifth temperature transmitter (20), the third pressure transmitter (22), the second flow meter (24), the lubricating oil pump (25), the fully automatic heated oil tank (28), the sixth temperature transmitter (21), and the second solenoid valve (18). The third solenoid valve (19) is connected to the inlet of the hot side cavity of the evaporator to be tested in the vacuum chamber (7) as the lubricating oil outlet, and the second solenoid valve (18) is connected to the outlet of the hot side cavity of the evaporator to be tested in the vacuum chamber (7) as the lubricating oil return. A water vapor condensation branch is connected in sequence to a cooling device (9), a water storage tank (17), and a first solenoid valve (16). The water storage tank (17) is connected to the hot side medium outlet end of the cooling device (9), and the first solenoid valve (16) is located at the condensate outlet end of the water storage tank (17). The condensate circulation loop is connected in sequence to a fourth temperature transmitter (13), a water tank (15), a water pump (12), a first flow meter (11), and a third temperature transmitter (10). The fourth temperature transmitter (13) is installed on the return water pipe connected to the cold side medium outlet end of the cooling device (9), and the return water pipe is connected to the inlet of the water tank (15). The third temperature transmitter (10) is installed on the inlet water pipe connected to the cold side medium inlet end of the cooling device (9). The test method includes the following steps: Step 1: The first vacuum pump unit (1) is used to pump the inside of the evaporator to be tested to a specified pressure value, and the second vacuum pump unit (2) is used to pump the cavity of the vacuum chamber (7) to a specified pressure value. Step 2: Start the fully automatic heating oil tank (28) to heat the lubricating oil to the specified value, then open the third solenoid valve (19) and the second solenoid valve (18) in the lubricating oil circulation loop, turn on the lubricating oil pump (25), and adjust the lubricating oil flow rate to the specified value. The lubricating oil circulates in the hot side cavity of the evaporator to be tested in the vacuum chamber (7) and heats the cold side cavity of the evaporator to be tested. The water in the heated cold side cavity of the evaporator to be tested turns into gas and carries away some of the heat from the lubricating oil. Step 3: Start the condensate circulation loop. After the water vapor in the cold side cavity of the evaporator to be tested enters the cooling device (9), it condenses into liquid water and enters the water storage tank (17). Continue until the water in the cold side cavity of the evaporator to be tested is completely evaporated. Record the evaporation time of the water in the cold side cavity of the evaporator to be tested and the temperature difference between the inlet and outlet lubricating oil in the hot side cavity of the evaporator to be tested.

2. The method for testing the high-altitude performance of an evaporator according to claim 1, characterized in that: The vacuum chamber (7) is also equipped with a gas replenishment valve (6) that communicates with the cavity.

3. The method for testing the high-altitude performance of an evaporator according to claim 1, characterized in that: The lubricating oil circulation loop is also equipped with a first coarse filter (23), a second coarse filter (27), and a precision filter (26). The first coarse filter (23) is located between the oil return port of the fully automatic heated oil tank (28) and the second solenoid valve (18). The second coarse filter (27) is located between the oil outlet of the fully automatic heated oil tank (28) and the lubricating oil pump (25). The precision filter (26) is located between the second coarse filter (27) and the lubricating oil pump (25).

4. The method for testing the high-altitude performance of an evaporator according to claim 1, characterized in that: A filter (14) is also installed on the condensate circulation loop, and the filter (14) is connected to the outlet of the water tank (15).

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