CN112249361B - Cooling ventilation simulation device and control method for high-altitude airborne equipment testing - Google Patents

Abstract

The present application provides a cooling and ventilation simulation device and a control method for high-altitude airborne equipment testing, comprising: an air source, a filter, a pressure reducing valve, a flow control unit, a refrigerator, a heater and a back pressure valve connected in sequence, The output end of the back pressure valve is connected to the low-pressure cabin, and the high-altitude airborne equipment is tested in the low-pressure cabin; the air source is used to output high-pressure air, the filter is used to filter out particles and oily impurities in the air, and the pressure reducing valve is used to reduce the high-pressure air. The flow control unit is used to control the set flow of the decompressed air, the refrigerator and the heater are used to adjust the temperature of the air, and the back pressure valve is used to stabilize the pressure difference between the cooling ventilation system and the low pressure chamber. The beneficial effects of the present application are: the low-pressure cooling and ventilation environment is provided for the low-pressure chamber through the ventilation device of the present application, so that the test environment is closer to the real working condition; and the ventilation device of the present application can also realize the controllable flow, pressure and temperature of the ventilation, Ensure the stability of the test environment.

Description

Cooling ventilation simulation device and control method for high-altitude airborne equipment testing

technical field

The present disclosure relates to the technical field of low-pressure environment simulation, in particular to a cooling ventilation simulation device and a control method for high-altitude airborne equipment testing.

Background technique

To test high-altitude airborne equipment on the ground, it is necessary to simulate the high-altitude, low-pressure and low-temperature environment to test its working performance in the high-altitude environment.

This high-altitude, low-pressure and low-temperature environment is usually simulated by low-pressure environment simulation equipment. The specific simulation method is as follows: the low-pressure environment simulation equipment has a low-pressure chamber, and the internal pressure and temperature are controlled to simulate high-altitude environments at different altitudes.

Airborne equipment is often accompanied by a lot of heat during work engineering, and its cooling device needs the aircraft's environmental control system to provide cooling ventilation, so its ground test should also provide cooling ventilation conditions. The existing low-pressure environment simulation equipment is difficult to achieve a cooling and ventilation environment and cannot meet the simulation needs.

Existing cooling and ventilation devices can only be used under normal pressure, and are not designed for low-pressure environments. Therefore, their use in low-pressure environments will lead to unstable system conditions, uncontrollable temperature and flow, and other problems, which seriously affect the test results. .

SUMMARY OF THE INVENTION

The purpose of this application is to address the above problems, to provide a cooling ventilation simulation device and a control method for high-altitude airborne equipment testing.

In a first aspect, the present application provides a cooling and ventilation simulation device for high-altitude airborne equipment testing, comprising: an air source, a filter, a pressure reducing valve, a flow control unit, a refrigerator, a heater and a back pressure valve connected in sequence , the output end of the back pressure valve is communicated with the low-pressure cabin, and the high-altitude airborne equipment is set in the low-pressure cabin for testing; the air source is used to output high-pressure air, and the filter is used to filter out particles in the high-pressure air and oily impurities, the pressure reducing valve is used to decompress the filtered high-pressure air, the flow control unit is used to set the flow control of the decompressed air, the refrigerator and the heater are used to adjust the temperature of the air, and the back pressure valve is used for To stabilize the pressure difference between the cooling ventilation system and the low pressure chamber.

According to the technical solutions provided in the embodiments of the present application, the flow control unit includes a proportional solenoid valve and a flowmeter, the proportional solenoid valve is arranged on a side close to the pressure reducing valve, the flowmeter is used to measure the flow of the cooling and ventilation system, and the proportional solenoid The valve adjusts the valve body opening according to the data measured by the flow meter.

According to the technical solutions provided in the embodiments of the present application, the refrigerator and the heater are separately controlled to realize the temperature adjustment of the cooling and ventilation system.

In a second aspect, the present application provides a cooling ventilation simulation device control method for high-altitude airborne equipment testing, comprising the following steps:

Set the first set pressure value at the output end of the pressure reducing valve and the second set pressure value at the input end of the back pressure valve;

The air source outputs high pressure air;

The filter filters particles and oily impurities from the high-pressure air;

The pressure reducing valve decompresses the filtered air so that the pressure reducing valve outputs the air of the first set pressure value;

The back pressure valve adjusts the pressure of the air transmitted to its input end so that the pressure of the air transmitted to the input end of the back pressure valve is adjusted to a second set pressure value;

The flow control unit adjusts the air flow of the air with a constant pressure difference between the first set pressure value and the second set pressure value between the pressure reducing valve and the back pressure valve, so that the air transmitted to the input end of the back pressure valve has the set value flow;

The refrigerator and the heater adjust the temperature of the air between the pressure reducing valve and the back pressure valve, so that the air transmitted to the input end of the back pressure valve has a set temperature;

The air with the set flow and temperature is output to the low pressure chamber through the back pressure valve to realize the air supply to the low pressure chamber.

According to the technical solution provided by the embodiment of the present application, the flow control unit performs air flow adjustment on the air having a constant pressure difference between the first set pressure value and the second set pressure value between the pressure reducing valve and the back pressure valve, Specifically include:

The flow meter measures the system flow and sends the measured flow value to the proportional solenoid valve;

After the proportional solenoid valve compares the measured flow value with the set flow value of the system, adjust the opening of the proportional solenoid valve so that the measured flow value is consistent with the set flow value.

The present invention has the following beneficial effects:

1. When meeting the ground test of high-altitude airborne equipment, the cooling and ventilation environment is realized in the low-pressure environment simulation system, so that the simulated test environment is closer to the actual use environment;

2. The controllability of the flow, pressure and temperature of the cooling ventilation system can be ensured in different air pressure environments of the low pressure chamber.

Description of drawings

1 is a schematic diagram of the structural principle of the first embodiment of the application;

Fig. 2 is the flow chart of the second embodiment of the application;

The text in the figure is marked as: 1. Air source; 2. Filter; 3. Pressure reducing valve; 4. Flow control unit; 4.1. Proportional solenoid valve; 4.2, Flow meter; 5. Refrigerator; 7. Back pressure valve; 8. Low pressure chamber.

Detailed ways

In order for those skilled in the art to better understand the technical solutions of the present invention, the present application will be described in detail below with reference to the accompanying drawings. The description in this part is only exemplary and explanatory, and should not have any limiting effect on the protection scope of the present application. .

FIG. 1 is a schematic diagram of the first embodiment of the application. In this embodiment, the high-altitude airborne equipment is tested in the low pressure chamber 8. The ventilation device of the application includes: an air source 1, a filter and a filter connected in sequence. 2. The pressure reducing valve 3 , the flow control unit 4 , the refrigerator 5 , the heater 6 and the back pressure valve 7 , the output end of the back pressure valve 7 is connected to the low pressure chamber 8 .

The air source 1 is used to output high-pressure air, the filter 2 is used to filter out particles and oily impurities in the high-pressure air, the pressure reducing valve 3 is used to decompress the filtered high-pressure air, and the flow control unit 4 is used to reduce the pressure. The compressed air is used for set flow control, the refrigerator 5 and the heater 6 are used to adjust the temperature of the air, and the back pressure valve 7 is used to stabilize the pressure difference between the cooling ventilation system and the low-pressure chamber 8, that is, the pressure of the ventilation system is not stable. Affected by the pressure change in the low pressure chamber 8, it is ensured that the supply air temperature and flow rate can be kept constant during the low pressure test.

In a preferred embodiment, the flow control unit 4 includes a proportional solenoid valve 4.1 and a flow meter 4.2, the proportional solenoid valve 4.1 is arranged on the side close to the pressure reducing valve 3, and the flow meter 4.2 is used to measure the flow of the cooling and ventilation system. , the proportional solenoid valve 4.1 adjusts the valve body opening according to the data measured by the flow meter 4.2.

In a preferred embodiment, the refrigerator 5 and the heater 6 are controlled separately to realize the temperature adjustment of the cooling and ventilation system.

As shown in FIG. 2 , it is a flowchart of the second embodiment of the present application. This embodiment is a method for controlling the device of the first embodiment, including the following steps:

S1, set the first set pressure value of the output end of the pressure reducing valve and the second set pressure value of the input end of the back pressure valve;

S2, the air source outputs high pressure air;

S3. The filter filters the high-pressure air for particles and oily impurities;

S4, the pressure reducing valve decompresses the filtered air so that the pressure reducing valve outputs the air of the first set pressure value;

S5, the back pressure valve adjusts the pressure of the air transmitted to its input end so that the pressure of the air transmitted to the input end of the back pressure valve is adjusted to the second set pressure value;

S6. The flow control unit adjusts the air flow of the air with a constant pressure difference between the first set pressure value and the second set pressure value between the pressure reducing valve and the back pressure valve, so that the air transmitted to the input end of the back pressure valve has set flow;

S7, the refrigerator and the heater adjust the temperature of the air between the pressure reducing valve and the back pressure valve, so that the air transmitted to the input end of the back pressure valve has a set temperature;

S8. The air with the set flow and set temperature is output to the low pressure chamber through the back pressure valve, so as to realize the air supply to the low pressure chamber.

In a preferred embodiment, step S6 specifically includes:

S61, the flow meter measures the system flow, and sends the measured flow value to the proportional solenoid valve;

S62, after the proportional solenoid valve compares the measured flow value with the system set flow value, adjust the opening of the proportional solenoid valve so that the measured flow value is consistent with the set flow value.

Specific examples are used herein to illustrate the principles and implementations of the present application, and the descriptions of the above examples are only used to help understand the methods and core ideas of the present application. The above are only the preferred embodiments of the present application. It should be pointed out that, due to the limited expression of words, there are objectively unlimited specific structures. For those of ordinary skill in the art, without departing from the principles of the present application However, several improvements, modifications or changes can also be made, and the above-mentioned technical features can also be combined in an appropriate manner; these improvements, modifications, or combinations, or the ideas and technical solutions of the application are directly applied to other occasions without improvement. shall be regarded as the protection scope of this application.

Claims (4)

1. A cooling ventilation analogue means for test of high altitude airborne equipment, its characterized in that is including connecting gradually: the high-altitude airborne equipment comprises an air source, a filter, a pressure reducing valve, a flow control unit, a refrigerator, a heater and a back pressure valve, wherein the output end of the back pressure valve is communicated with a low-pressure cabin, and the high-altitude airborne equipment is arranged in the low-pressure cabin for testing;

the air source is used for outputting high-pressure air, the filter is used for filtering particles and oily impurities in the high-pressure air, the pressure reducing valve is used for reducing the pressure of the filtered high-pressure air, the flow control unit is used for setting flow control on the reduced air, the refrigerator and the heater are used for adjusting the temperature of the air, and the back pressure valve is used for stabilizing the pressure difference between the cooling ventilation system and the low-pressure chamber; the air with set flow and set temperature is output to the low-pressure cabin through the back pressure valve, so that the air supply to the low-pressure cabin is realized;

the flow control unit comprises a proportional solenoid valve and a flowmeter, the flowmeter is used for measuring the flow of the cooling and ventilating system, and the proportional solenoid valve adjusts the opening of the valve body according to data measured by the flowmeter.

2. The cooling and ventilation simulation device for the test of the high-altitude airborne equipment according to claim 1, wherein the refrigerator and the heater are respectively and independently controlled to realize temperature regulation of the cooling and ventilation system.

3. A control method of a cooling and ventilation simulation device for testing of airborne equipment using the device of any of claims 1-2, characterized by comprising the following steps:

setting a first set pressure value at the output end of the pressure reducing valve and a second set pressure value at the input end of the back pressure valve;

the air source outputs high-pressure air;

the filter filters particles and oily impurities of the high-pressure air;

the pressure reducing valve reduces the pressure of the filtered air so that the pressure reducing valve outputs air with a first set pressure value;

the backpressure valve adjusts the pressure of the air transmitted to the input end of the backpressure valve so that the pressure of the air transmitted to the input end of the backpressure valve is adjusted to a second set pressure value;

the flow control unit adjusts the air flow of the air with a first set pressure value and a second set pressure value constant pressure difference value between the pressure reducing valve and the backpressure valve, so that the air transmitted to the input end of the backpressure valve has set flow;

the refrigerator and the heater regulate the temperature of the air between the pressure reducing valve and the backpressure valve, so that the air transmitted to the input end of the backpressure valve has a set temperature;

the air with set flow and set temperature is output to the low-pressure cabin through the backpressure valve, and air supply to the low-pressure cabin is achieved.

4. The method for controlling the cooling and ventilation simulation device for the test of the airborne equipment of the high altitude as claimed in claim 3, wherein the flow control unit adjusts the air flow rate of the air with a constant differential pressure value between a first set pressure value and a second set pressure value between the pressure reducing valve and the back pressure valve, and specifically comprises:

the flowmeter measures the system flow and sends the measured flow value to the proportional solenoid valve;

and after the proportional solenoid valve compares the measured flow value with the set flow value of the system, the opening degree of the proportional solenoid valve is adjusted to enable the measured flow value to be consistent with the set flow value.

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