Airplane air conditioning system heat exchanger pressure drop test bench

Abstract

The utility model discloses a pressure drop testboard for a heat exchanger of an aircraft air conditioning system, which is characterized in that an air source header pipe is provided with different air supply pipelines according to the flow, the air supply pipelines lead to the output end of the air source header pipe, the output end is simultaneously connected with a cold path pipe and a hot path pipe, and a plurality of cold path test pipes are connected on the cold path pipe in parallel; the plurality of thermal circuit test tubes are connected in parallel to the thermal circuit tube, and the cold circuit test tubes connected in parallel and the thermal circuit test tubes connected in parallel are connected with pressure drop tools of different models; the pressure drop test bench further comprises a console which controls the opening degree of each pipe through a valve. According to the utility model, the manual mechanical operation time can be reduced, and the test efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of aircraft maintenance, and in particular relates to a pressure drop test bench for a heat exchanger of an aircraft air conditioning system. Background Art

[0002] Aircraft air conditioning system heat exchangers are important components of the air conditioning system, which directly affect the temperature and humidity of the aircraft cabin and cockpit environment, and are related to the comfort of passengers and pilots. Heat exchangers are used in harsh environments, and cores and pipes are often blocked. In order to test the performance of heat exchangers, the manual requires that pressure drop tests be performed on heat exchangers after maintenance.

[0003] At present, it is impossible to obtain technical support from the original manufacturer in China. The heat exchanger pressure drop test benches made by various repair shops are not comprehensive, and there are still many deficiencies, including the need to manually move and adjust the pressure drop tooling of different models for each pressure drop test to splice the tooling and mechanically switch the orifice plate. In short, the manual and mechanical operation steps of the pressure drop test system in the existing workshop are cumbersome. In order to improve work efficiency, the utility model is intended to provide a comprehensive heat exchanger pressure drop test bench. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a comprehensive aircraft air conditioning system heat exchanger pressure drop test bench to improve the testing efficiency of workers.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is as follows: a pressure drop test bench for a heat exchanger of an aircraft air conditioning system, characterized in that the air source main pipe is provided with different air supply pipelines leading to the output end of the air source main pipe according to the flow rate, the output end is connected to the cold circuit pipe and the hot circuit pipe at the same time, a plurality of cold circuit test pipes are connected in parallel to the cold circuit pipe, a plurality of hot circuit test pipes are connected in parallel to the hot circuit pipe, and the cold circuit test pipes and the hot circuit test pipes are connected in parallel to each other with pressure drop fixtures of different models;

[0006] The pressure drop test bench also includes a control console, which controls the opening of each pipe through a valve.

[0007] The console includes a host computer (computer), a touch screen and a PLC. The host computer is connected to the touch screen and the PLC respectively. The PLC receives and executes control instructions from the host computer. The entire test system adopts hierarchical control, with clear responsibilities and division of labor, which facilitates subsequent maintenance and management.

[0008] Beneficial effects:

[0009] When using the pressure drop test bench of the utility model for testing, the heat exchanger can be directly connected by selecting the tooling of the corresponding model, without the need to manually move and adjust the tooling of the adapted model each time the test is performed as in the prior art; in addition, high-precision testing can be achieved by switching the gas supply pipeline of the corresponding flow level according to the needs, without the need to mechanically switch the orifice plate to control the gas supply flow rate as in the prior art. It can be seen that the use of the utility model can reduce the time of manual and mechanical operation and improve the test efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 A schematic diagram of the piping of a pressure drop test bench for a heat exchanger of an aircraft air conditioning system according to a preferred embodiment of the utility model;

[0011] Figure 2 A schematic diagram of the composition and connection relationship of a control console of a pressure drop test bench for a heat exchanger of an aircraft air conditioning system according to a preferred embodiment of the utility model;

[0012] Figure 3 , 4 The present invention is a display interface of a touch screen of a pressure drop test bench for a heat exchanger of an aircraft air conditioning system according to a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0013] The utility model is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0014] Figure 1 It is a schematic diagram of the pipeline of the aircraft air conditioning system heat exchanger pressure drop test bench of the specific embodiment of the utility model. As shown in the figure, the air source main pipe 1 is provided with two different air supply pipes 11 and 12 according to the flow rate, and they both lead to the output end 13 of the air source main pipe 1. The output end 13 is connected to the cold circuit pipe 2 and the hot circuit pipe 3 at the same time. The 7-way cold circuit test pipes 21 are connected to the cold circuit pipe 2 in parallel, and their other ends are respectively connected to the cold circuit test fixtures 1-7, and the 4-way hot circuit test pipes 31 are connected to the hot circuit pipe 3 in parallel, and their other ends are respectively connected to the hot circuit test fixtures 1-4. Whether it is the cold circuit test fixtures 1-7 or the hot circuit test fixtures 1-4, they all cover different models, and the appropriate test pipeline can be selected according to the heat exchangers of different models. Figure 1 The pipeline controlled by valves 059-062 is a water pipeline, which is used to flush the hot circuit before the hot circuit test. The entire mechanical pipeline structure of the pressure drop test bench in this embodiment is made of high-strength 304 stainless steel material, which has good mechanical properties.

[0015] The pressure drop test bench of this embodiment makes up for the shortcomings of the existing pressure drop test bench. It includes multi-channel test pipelines. The pressure drop tooling of different models is directly installed on each hot circuit test pipe and cold circuit test pipe. During the test, there is no need to disassemble the heat exchanger. The heat exchanger is directly connected to the test bench through the matching tooling, and then the control console is operated to control the opening of the valve on the corresponding pipeline. The components connected to the corresponding pipeline can be tested, which can save a lot of tooling handling and splicing time. In addition, high-precision testing can be achieved by switching large-flow and small-flow gas supply pipelines. There is no need to control the size of the gas supply flow by mechanically switching heavy orifice plates, which can further reduce manual mechanical operation time.

[0016] like Figure 2 As shown, the console of this embodiment mainly includes a host computer, a touch screen and a PLC, and the host computer is connected to the touch screen and the PLC respectively. Various test parameters of the system are set in the host computer, which may include various machine models that need to be tested. Different test modes can be set corresponding to different machine models. The test mode is optional, which is convenient and fast. The touch screen is mainly used to centrally display various test data, with high display accuracy and flexible processing. The PLC is mainly used to receive control instructions from the host computer to control the test process, the status of each valve, and the centralized collection of various test parameters. The entire test system is hierarchically controlled, with clear responsibilities and division of labor, which is convenient for later maintenance and management. After the test is completed, the host computer automatically pops up the test data, and the test data of different components can be saved.

[0017] The pressure drop test bench of this embodiment also includes a MODBUS data collector for data acquisition, which transmits data to the PLC via the RS485 communication protocol. The PLC timing control controls the opening and closing of each pneumatic ball valve via an intermediate relay. The test bench also includes a variety of sensors, among which high-precision sensors are used for pressure and temperature collection, including hot circuit pressure gauge (0-400kpa, ±0.075% accuracy), hot circuit pressure gauge (0-25kpa, ±0.05% accuracy), cold circuit pressure gauge (0-1kpa, ±0.1% accuracy), atmospheric pressure gauge (0~200kpa, ±0.1% accuracy), pipeline thermometer (0-120℃, ±0.1% accuracy), and the data are transmitted to the MODBUS data collector through the industrial signal 4-20ma; flow collection adopts flow meter, including: large flow meter (0-400ppm, ±1.5% reading accuracy), small flow meter (0-40ppm, ±1.5% reading accuracy), and the data are transmitted to the MODBUS data collector through the industrial signal 4-20ma.

[0018] The electrical control parameter display interface of the touch screen in this embodiment is as follows Figure 3 , 4As shown: All data are displayed in a centralized manner with high accuracy, which is convenient for real-time observation of data changes. It displays the data changes of large / small flow, and also displays the data changes of atmospheric pressure and pressure sensors of the three test components. When adjusting the flow adjustment knob, its value changes can be reflected in real time.

Claims

1. A pressure drop test bench for heat exchangers of an aircraft air conditioning system, characterized in that: Its gas source main pipe is provided with different gas supply pipelines leading to the output end of the gas source main pipe according to the flow rate. The output end is connected to the cold circuit pipe and the hot circuit pipe at the same time. A number of cold circuit test pipes are connected in parallel to the cold circuit pipe, and a number of hot circuit test pipes are connected in parallel to the hot circuit pipe. The cold circuit test pipes and the hot circuit test pipes are connected in parallel with each other. Different models of pressure drop fixtures are connected. The pressure drop test bench also includes a control console, which controls the opening of each pipe through a valve.

2. The voltage drop test bench according to claim 1, characterized in that: The control console comprises a host computer, a touch screen and a PLC. The host computer is connected to the touch screen and the PLC respectively. The PLC receives and executes control instructions of the host computer.

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