Measuring device for air entraining system of aviation auxiliary power device

Abstract

The utility model discloses a measuring device for an air entraining system of an aviation auxiliary power device, and relates to the technical field of air entraining systems of APU test bed. The device comprises a connecting pipeline, the connecting pipeline comprises a stainless steel hose, a first rigid connecting pipe, a second rigid connecting pipe, a third rigid connecting pipe, a silencer module and an exhaust pipe, one end of the stainless steel hose is connected with an APU air guiding pipe, the other end of the stainless steel hose is connected with the first rigid connecting pipe, and the first rigid connecting pipe is connected with the second rigid connecting pipe; the second rigid connecting pipe is connected with the third rigid connecting pipe, the third rigid connecting pipe is connected with the silencer module, and the silencer module is connected with the exhaust pipe. The pipeline arrangement is simple, the number of valves and elbows is small, the number of corresponding fault points is small, meanwhile, the space requirement is small, airflow is relatively smooth, and the manufacturing cost is low.

Description

Technical Field

[0001] The utility model relates to the technical field of an air bleed system of an APU test bench, and more specifically is a measuring device for an air bleed system of an aviation auxiliary power unit. Background Art

[0002] APU is an important part of the aircraft, called auxiliary power unit, which is generally installed in the tail cone of the last section of the fuselage. Its core is a small turbine engine, which provides electricity and compressed air to the aircraft. It is used to start the main engine of the aircraft on the ground to ensure the lighting and air conditioning in the cabin and cockpit. At a certain flight altitude, it can also be used as a backup power supply; the function of the APU's bleed air system is to provide the pressurized air output by the APU load compressor to the air conditioning system, engine starting system and other pneumatic components on the aircraft; when the APU is put into use, an APU test bench is needed to test its performance. The bleed air system of the APU test bench is used to adjust and measure the APU bleed air flow rate to simulate the working state of the air system under actual use.

[0003] The existing APU test bench air bleed system has the following problems when in use:

[0004] 1) For different types of APUs, the installation distance of the air bleed pipe from the APU body is different, and it is difficult to install the air bleed pipes of the APU test bench air bleed system and different types of APUs.

[0005] 2) The pipeline layout is unreasonable, the number of fault points increases, the airflow is relatively unsmooth, the construction cost is also high, the installation space requirement is also large, and the measurement error is large.

[0006] Therefore, it is necessary to develop an aviation auxiliary power unit bleed air system measuring device with simple pipeline layout, few failure points, small space requirement, relatively smooth airflow and low construction cost. Utility Model Content

[0007] The purpose of the utility model is to overcome the shortcomings of the above-mentioned background technology and to provide a measuring device for the bleed air system of an aviation auxiliary power unit.

[0008] In order to achieve the above-mentioned purpose, the technical solution of the utility model is: a measuring device for the air bleed system of an aviation auxiliary power unit, characterized in that: it includes a connecting pipeline, the connecting pipeline includes a stainless steel hose, a first rigid connecting pipe, a second rigid connecting pipe, a third rigid connecting pipe, a muffler module and an exhaust pipe, one end of the stainless steel hose is connected to the APU air bleed pipe through a quick-release joint flange, and the other end is connected to the first rigid connecting pipe through a first elbow, the first rigid connecting pipe is connected to the second rigid connecting pipe through a second elbow, the second rigid connecting pipe is connected to the third rigid connecting pipe through a third elbow, the third rigid connecting pipe is connected to the muffler module through a valve module and a fourth elbow in sequence, and the muffler module is connected to the exhaust pipe;

[0009] The third curved pipe is provided with a rectifier, and the third rigid connecting pipe is provided with an orifice flowmeter.

[0010] In the above technical solution, the APU bleed air pipe is connected to the quick-release joint flange of the stainless steel hose through a bleed air rigid connecting pipe, and the bleed air rigid connecting pipe is provided with a bleed air temperature sensor and a bleed air pressure sensor.

[0011] In the above technical solution, the stainless steel hose is connected to the first elbow via a quick-release joint flange.

[0012] In the above technical solution, the inner diameter of the bleed air rigid connection pipe is 4 inches, the inner diameter of the stainless steel hose is 4 inches, the inner diameter of the first rigid connection pipe is 6 inches, the inner diameter of the second rigid connection pipe is 8 inches, and the inner diameter of the third rigid connection pipe is 8 inches.

[0013] In the above technical solution, the valve module is controlled by two control valves, one control valve adopts an 8-inch butterfly valve, and the other control valve adopts a 1-inch ball valve, and both the butterfly valve and the ball valve are electric valves.

[0014] In the above technical solution, the orifice flowmeter is composed of an orifice static pressure PT, an orifice pressure difference PT and an orifice temperature RTD.

[0015] Compared with the prior art, the utility model has the following advantages:

[0016] 1) The utility model meets the performance test requirements of the three models of APU bleed air systems, GTCP131-9A, GTCP131-9B and GTCP331-350C, and can realize fast and high-precision measurement of working characteristics under engine conditions. The bleed air mass flow control and measurement accuracy are high, the method is simple and the safety is high.

[0017] 2) The utility model has a simple pipeline layout, a small number of valves and elbows, and a small number of corresponding failure points. At the same time, the space requirement is small, the airflow is relatively smooth, and the construction cost is low.

[0018] 3) The utility model can more accurately adjust and measure the air flow rate while ensuring the air circulation capacity through the arrangement of the pipeline.

[0019] 4) The utility model can adapt to different types of APUs through the provision of a hose and the selection of orifice flowmeters of different sizes, thereby facilitating the adjustment and installation of different types of APUs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a front view of the utility model.

[0021] Figure 2 It is a top view of the utility model.

[0022] Figure 3 It is a side view of the utility model.

[0023] Figure 4 It is the principle diagram of the utility model.

[0024] Among them, 1-connecting pipe, 11-stainless steel hose, 111-quick-release connector flange, 112-first elbow, 12-first rigid connecting pipe, 121-second elbow, 13-second rigid connecting pipe, 131-third elbow, 132-rectifier, 14-third rigid connecting pipe, 141-valve module, 1411-butterfly valve, 1412-ball valve, 142-fourth elbow, 1421-orifice static pressure PT, 1422-orifice pressure differential PT, 1423-orifice temperature RTD, 143-orifice flowmeter, 15-muffler module, 16-exhaust pipe. DETAILED DESCRIPTION

[0025] The following is a detailed description of the implementation of the utility model in conjunction with the accompanying drawings, but they do not constitute a limitation of the utility model and are only used as examples. At the same time, the advantages of the utility model will become clearer and easier to understand through the description.

[0026] Referring to the accompanying drawings, it can be seen that: an aviation auxiliary power unit bleed air system measuring device, characterized in that: it includes a connecting pipe 1, the connecting pipe 1 includes a stainless steel hose 11, a first rigid connecting pipe 12, a second rigid connecting pipe 13, a third rigid connecting pipe 14, a muffler module 15 and an exhaust pipe 16, one end of the stainless steel hose 11 is connected to the APU bleed air pipe through a quick-release joint flange 111, and the other end is connected to the first rigid connecting pipe 12 through a first elbow 112, the first rigid connecting pipe 12 is connected to the second rigid connecting pipe 13 through a second elbow 121, the second rigid connecting pipe 13 is connected to the third rigid connecting pipe 14 through a third elbow 131, the third rigid connecting pipe 14 is connected to the muffler module 15 through a valve module 141 and a fourth elbow 142 in sequence, and the muffler module 15 is connected to the exhaust pipe 16;

[0027] The third curved pipe 131 is provided with a rectifier 132 , and the third rigid connecting pipe 14 is provided with an orifice flowmeter 143 .

[0028] The APU bleed air pipe is connected to the quick-release joint flange 111 of the stainless steel hose 11 through a bleed air rigid connecting pipe, and the bleed air rigid connecting pipe is provided with a bleed air temperature sensor and a bleed air pressure sensor.

[0029] The stainless steel hose 11 is connected to the first elbow 112 via a quick-release joint flange 111 .

[0030] The inner diameter of the bleed air rigid connection pipe is 4 inches, the inner diameter of the stainless steel hose 11 is 4 inches, the inner diameter of the first rigid connection pipe 12 is 6 inches, the inner diameter of the second rigid connection pipe 13 is 8 inches, and the inner diameter of the third rigid connection pipe 14 is 8 inches.

[0031] The valve module 141 is controlled by two control valves, one of which is an 8-inch butterfly valve 1411 and the other is a 1-inch ball valve 1412 . Both the butterfly valve 1411 and the ball valve 1412 are electric valves.

[0032] The orifice flowmeter 143 is composed of an orifice static pressure PT1421, an orifice pressure difference PT1422 and an orifice temperature RTD1423.

[0033] In actual use, the bleed air rigid connection pipe can be replaced through the quick-release joint flange 111, so as to adapt to different types of auxiliary power units.

[0034] The stainless steel hose 11 is easy to adapt to different types of machines and is convenient for adjustment and installation.

[0035] The 8-inch third rigid connecting tube 14 is selected to facilitate the measurement of the induced air flow rate. If the tube is very thin, the resistance loss of the tube will be greater, and the measurement error of the induced air flow rate will be greater.

[0036] The elbow will cause pressure loss and then cause air flow turbulence. The setting of the rectifier 132 changes the irregular flow of air into a regular flow of air, or changes the rotating air flow into a straight flow of air, thereby reducing the measurement error of the air flow.

[0037] The valve module 141 has the function of regulating the bleed air flow rate. The butterfly valve 1411 provides rough adjustment for the bleed air flow rate. The ball valve 1412 is used for fine control of the bleed air flow rate. Both the butterfly valve 1411 and the ball valve 1412 are electric valves, which are controlled by the measurement and control system.

[0038] The orifice flowmeter 143 realizes the bleed air flow measurement. The orifice flowmeter 143 is composed of PT6 (orifice static pressure), PT7 (orifice pressure difference) and RTD5 (orifice temperature). These parameters are measured by the measurement and control system, and the air flow is calculated based on them. Sufficient length must be reserved in front of the orifice flowmeter 143 to stabilize the flow. The orifice flowmeter 143 can meet the flow test requirements of different models by replacing the orifice plate. For example, 131-9A / B share the bleed air channel and 3.5-inch orifice flowmeter; 331-350C uses a separate bleed air channel and a 5-inch orifice flowmeter.

[0039] The muffler module 15 is a resistive muffler. The basic type of exhaust system has insufficient noise reduction. Considering the influence of ventilation flow rate, resistance, etc., it is necessary to add an exhaust muffler with higher noise reduction.

[0040] The bleed air flows through the APU bleed air pipe → bleed air rigid connection pipe → bleed air temperature sensor and bleed air pressure sensor → bleed air rigid connection pipe → stainless steel hose 11 → first elbow 112 → first rigid connection pipe 12 → second elbow 121 → rectifier → second rigid connection pipe 13 → third elbow 131 → rectifier 132 → third rigid connection pipe 14 → orifice flowmeter 143 → third rigid connection pipe 14 → valve module 141 → fourth elbow 142 → muffler module 15 → exhaust pipe 16 → atmosphere.

[0041] Other parts not described belong to the prior art.

Claims

1. A device for measuring the bleed air system of an aviation auxiliary power unit, characterized in that: The invention comprises a connecting pipe (1), wherein the connecting pipe (1) comprises a stainless steel hose (11), a first rigid connecting pipe (12), a second rigid connecting pipe (13), a third rigid connecting pipe (14), a muffler module (15) and an exhaust pipe (16); one end of the stainless steel hose (11) is connected to the APU air duct through a quick-release joint flange (111), and the other end is connected to the first rigid connecting pipe (12) through a first elbow (112); the first rigid connecting pipe (12) is connected to the second rigid connecting pipe (13) through a second elbow (121); the second rigid connecting pipe (13) is connected to the third rigid connecting pipe (14) through a third elbow (131); the third rigid connecting pipe (14) is connected to the muffler module (15) through a valve module (141) and a fourth elbow (142) in sequence; and the muffler module (15) is connected to the exhaust pipe (16); The third curved pipe (131) is provided with a rectifier (132), and the third rigid connecting pipe (14) is provided with an orifice flowmeter (143).

2. The device for measuring the bleed air system of an aviation auxiliary power unit according to claim 1, characterized in that: The APU bleed air pipe is connected to a quick-release joint flange (111) of a stainless steel hose (11) via a bleed air rigid connecting pipe, and the bleed air rigid connecting pipe is provided with a bleed air temperature sensor and a bleed air pressure sensor.

3. The device for measuring the bleed air system of an aviation auxiliary power unit according to claim 2, characterized in that: The stainless steel hose (11) is connected to the first elbow (112) via a quick-release joint flange (111).

4. The device for measuring the bleed air system of an aviation auxiliary power unit according to claim 3, characterized in that: The inner diameter of the bleed air rigid connection pipe is 4 inches, the inner diameter of the stainless steel hose (11) is 4 inches, the inner diameter of the first rigid connection pipe (12) is 6 inches, the inner diameter of the second rigid connection pipe (13) is 8 inches, and the inner diameter of the third rigid connection pipe (14) is 8 inches.

5. The device for measuring the bleed air system of an aviation auxiliary power unit according to claim 4, characterized in that: The valve module (141) is controlled by two control valves, one of which is a butterfly valve (1411) and the other is a ball valve (1412). Both the butterfly valve (1411) and the ball valve (1412) are electric valves.

6. The device for measuring the bleed air system of an aviation auxiliary power unit according to claim 5, characterized in that: The orifice flowmeter (143) is composed of an orifice static pressure PT (1421), an orifice differential pressure PT (1422) and an orifice temperature RTD (1423).

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