Low-temperature air source applied to canopy fatigue test

Abstract

The invention belongs to the technical field of fatigue tests, and particularly relates to a low-temperature air source applied to a canopy fatigue test. The air compressor is provided with a first air compressor outlet and a second air compressor outlet; the mixing tank is provided with a first mixing tank inlet, a second mixing tank inlet and a mixing tank outlet; the turbine pipe is provided with a turbine pipe inlet, a turbine pipe low-temperature outlet and a turbine pipe high-temperature outlet; the airflow pipeline comprises a first airflow pipeline, a second airflow pipeline and a third airflow pipeline, one end of the first airflow pipeline is connected with an outlet of the first air compressor, the other end of the first airflow pipeline is connected with an inlet of the first mixing tank, and a first adjusting valve is mounted on the first airflow pipeline; one end of the second airflow pipeline is connected with an outlet of the second air compressor, the other end of the second airflow pipeline is connected with an inlet of the turbine pipe, and a second adjusting valve is installed on the second airflow pipeline; one end of the third airflow pipeline is connected with a low-temperature outlet of the turbine pipe, and the other end is connected with an inlet of the second mixing tank. The operation cost is low, and the control precision is high.

Description

Technical Field

[0001] The present application belongs to the technical field of fatigue testing, and in particular relates to a low-temperature gas source used in fatigue testing of a canopy. Background Art

[0002] Canopy fatigue testing is crucial to the safety of military aircraft pilots. In canopy fatigue testing, low-temperature airflow is used to apply low-temperature loads to the canopy to assess its fatigue life.

[0003] There are two ways to prepare low-temperature air source for canopy fatigue test: one is to use refrigerator plus heat exchanger to cool the airflow as low-temperature air source; the other is to spray liquid nitrogen into the normal temperature airflow and use liquid nitrogen gasification to absorb heat and cool the airflow as low-temperature air source. Among them, refrigerator failure rate is high and operation cost is high; liquid nitrogen control accuracy is poor and utilization rate is low.

[0004] Therefore, it is desired to have a technical solution to overcome or at least alleviate at least one of the above-mentioned defects of the prior art. Summary of the invention

[0005] The purpose of the present application is to provide a low-temperature gas source for use in a canopy fatigue test to solve at least one problem existing in the prior art.

[0006] The technical solution of this application is:

[0007] A low temperature gas source for canopy fatigue testing, comprising:

[0008] An air compressor having a first air compressor outlet and a second air compressor outlet;

[0009] a mixing tank having a first mixing tank inlet, a second mixing tank inlet, and a mixing tank outlet;

[0010] A turbine tube, wherein the turbine tube has a turbine tube inlet, a turbine tube low temperature outlet, and a turbine tube high temperature outlet;

[0011] The airflow pipeline includes a first airflow pipeline, a second airflow pipeline and a third airflow pipeline, wherein:

[0012] One end of the first air flow pipeline is connected to the outlet of the first air compressor, and the other end is connected to the inlet of the first mixing tank, and a first regulating valve is installed on the first air flow pipeline;

[0013] One end of the second air flow pipeline is connected to the outlet of the second air compressor, and the other end is connected to the inlet of the turbine pipe, and a second regulating valve is installed on the second air flow pipeline;

[0014] One end of the third air flow pipeline is connected to the low-temperature outlet of the turbine tube, and the other end is connected to the inlet of the second mixing tank.

[0015] In at least one embodiment of the present application, the air compressor generates compressed air at 6.9-8 bar.

[0016] In at least one embodiment of the present application, the turbine tube has a first heat exchange pipeline close to the central axis and a second heat exchange pipeline close to the tube wall, the first heat exchange pipeline is connected to the low-temperature outlet of the turbine tube, and the second heat exchange pipeline is connected to the high-temperature outlet of the turbine tube.

[0017] In at least one embodiment of the present application, a computer is further included, and the computer is connected to the first regulating valve and the second regulating valve respectively, and is used to control the opening of the first regulating valve and the second regulating valve.

[0018] In at least one embodiment of the present application, the air flow pipeline further includes a low-temperature air source pipeline, and one end of the low-temperature air source pipeline is connected to the outlet of the mixing tank.

[0019] In at least one embodiment of the present application, a temperature sensor is provided on the low-temperature gas source pipeline.

[0020] In at least one embodiment of the present application, a computer is further included, which is respectively connected to the first regulating valve, the first regulating valve and the temperature sensor, and is used to control the opening of the first regulating valve and the first regulating valve according to the temperature signal fed back by the temperature sensor.

[0021] The invention has at least the following beneficial technical effects:

[0022] The low-temperature air source used in the fatigue test of the canopy in the present application uses a turbine tube to generate the low-temperature air source, which can provide a temperature-controllable low-temperature air source. The turbine tube cooling system has a low failure rate, low operating cost and high control accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of a low-temperature gas source used in a canopy fatigue test according to an embodiment of the present application. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the implementation of this application clearer, the technical scheme in the embodiment of this application will be described in more detail below in conjunction with the drawings in the embodiment of this application. In the drawings, the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The described embodiments are part of the embodiments of this application, not all of them. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain this application, and should not be construed as limitations on this application. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. The embodiments of this application are described in detail below in conjunction with the drawings.

[0025] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the scope of protection of the present application.

[0026] The following is combined with Figure 1 This application is described in further detail.

[0027] The present application provides a low-temperature air source for use in a canopy fatigue test, comprising: an air compressor, a mixing tank, a turbine pipe, and an airflow pipeline.

[0028] like Figure 1 As shown, the air compressor has a first air compressor outlet and a second air compressor outlet; the mixing tank has a first mixing tank inlet, a second mixing tank inlet and a mixing tank outlet; the turbine pipe has a turbine pipe inlet, a turbine pipe low-temperature outlet and a turbine pipe high-temperature outlet; the air flow pipeline includes a first air flow pipeline, a second air flow pipeline and a third air flow pipeline, wherein one end of the first air flow pipeline is connected to the first air compressor outlet, and the other end is connected to the first mixing tank inlet, and a first regulating valve is installed on the first air flow pipeline; one end of the second air flow pipeline is connected to the second air compressor outlet, and the other end is connected to the turbine pipe inlet, and a second regulating valve is installed on the second air flow pipeline; one end of the third air flow pipeline is connected to the turbine pipe low-temperature outlet, and the other end is connected to the second mixing tank inlet.

[0029] The low-temperature air source used in the canopy fatigue test of the present application adopts an air compressor capable of generating 6.9-8 bar compressed air. In the preferred embodiment of the present application, the turbine tube has a first heat exchange pipeline close to the central axis and a second heat exchange pipeline close to the tube wall, the first heat exchange pipeline is connected to the low-temperature outlet of the turbine tube, and the second heat exchange pipeline is connected to the high-temperature outlet of the turbine tube. After the compressed air enters the turbine tube, under the action of the internal structure, the air close to the tube wall rotates at a high speed, absorbs heat and heats up, and then is discharged from the high-temperature outlet of the turbine tube; the air close to the central axis rotates at a low speed, releases heat and cools down, and then is discharged from the low-temperature outlet of the turbine tube.

[0030] In one embodiment of the present application, the low-temperature gas source used for the canopy fatigue test also includes a computer, which is connected to the first regulating valve and the first regulating valve respectively, and is used to control the opening of the first regulating valve and the first regulating valve.

[0031] In another embodiment of the present application, the air flow pipeline further includes a low-temperature gas source pipeline, one end of which is connected to the outlet of the mixing tank, and a temperature sensor is provided on the low-temperature gas source pipeline. The low-temperature gas source applied to the fatigue test of the canopy further includes a computer, which is respectively connected to the first regulating valve, the first regulating valve and the temperature sensor, and is used to control the first regulating valve and the opening of the first regulating valve according to the temperature signal fed back by the temperature sensor.

[0032] The low temperature gas source used in the canopy fatigue test of this application has the following working principle:

[0033] 1. The 6.9-8 bar compressed air generated by the air compressor is divided into two paths. The first path of compressed air passes through the first regulating valve 1 on the first air flow pipeline and directly enters the mixing tank as normal temperature gas;

[0034] 2. The second compressed air passes through the second regulating valve 2 on the second air flow pipeline and enters the turbine pipe. Under the action of the turbine pipe, a part of the compressed air becomes low-temperature gas and is discharged from the low-temperature outlet of the turbine pipe and enters the mixing tank through the third air flow pipeline;

[0035] 3. The normal temperature gas and low temperature gas in the mixing tank are mixed and discharged from the outlet of the mixing tank as the low temperature gas source;

[0036] 4. The computer controls the first regulating valve 1 and the second regulating valve 2 to control the ratio of the normal temperature gas and the low temperature gas in the mixing tank, thereby controlling the temperature of the low temperature gas source.

[0037] The low-temperature gas source used in the fatigue test of the canopy of the present application adopts a new type of low-temperature gas source structure of a turbine tube, which is very simple, has low operating cost and low failure rate. Due to the use of computer control, the temperature of the low-temperature gas source can be adjusted, and the temperature control accuracy is high. The present application is not only suitable for fatigue tests of canopies of military aircraft, but also for other similar occasions, so it also has broad application prospects in the civilian field.

[0038] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A low temperature gas source used in canopy fatigue testing, characterized in that: include: An air compressor having a first air compressor outlet and a second air compressor outlet; a mixing tank having a first mixing tank inlet, a second mixing tank inlet, and a mixing tank outlet; A turbine tube, wherein the turbine tube has a turbine tube inlet, a turbine tube low temperature outlet, and a turbine tube high temperature outlet; The airflow pipeline includes a first airflow pipeline, a second airflow pipeline and a third airflow pipeline, wherein: One end of the first air flow pipeline is connected to the outlet of the first air compressor, and the other end is connected to the inlet of the first mixing tank, and a first regulating valve is installed on the first air flow pipeline; One end of the second air flow pipeline is connected to the outlet of the second air compressor, and the other end is connected to the inlet of the turbine pipe, and a second regulating valve is installed on the second air flow pipeline; One end of the third air flow pipeline is connected to the low-temperature outlet of the turbine tube, and the other end is connected to the inlet of the second mixing tank.

2. The low temperature gas source for canopy fatigue test according to claim 1, characterized in that: The air compressor produces compressed air at 6.9-8 bar.

3. The low temperature gas source for canopy fatigue test according to claim 2 is characterized in that: The turbine tube has a first heat exchange pipeline close to the central axis and a second heat exchange pipeline close to the tube wall, the first heat exchange pipeline is connected to the low-temperature outlet of the turbine tube, and the second heat exchange pipeline is connected to the high-temperature outlet of the turbine tube.

4. The low temperature gas source for canopy fatigue test according to claim 3 is characterized in that: It also includes a computer, which is connected to the first regulating valve and the second regulating valve respectively, and is used to control the opening of the first regulating valve and the second regulating valve.

5. The low temperature gas source for canopy fatigue test according to claim 3, characterized in that: The air flow pipeline also includes a low-temperature air source pipeline, one end of which is connected to the outlet of the mixing tank.

6. The low temperature gas source for canopy fatigue test according to claim 5, characterized in that: A temperature sensor is arranged on the low-temperature gas source pipeline.

7. The low temperature gas source for canopy fatigue test according to claim 6, characterized in that: It also includes a computer, which is connected to the first regulating valve, the second regulating valve and the temperature sensor respectively, and is used to control the opening of the first regulating valve and the second regulating valve according to the temperature signal fed back by the temperature sensor.

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