Air speed tube with deicing and drainage function

Abstract

The application discloses an air speed tube with deicing and drainage functions, which comprises main components such as a shuttle-shaped drainage port, a waterproof deicing plate, an adapter flange, a protective sleeve, a mounting seat and the like. The front end of the air speed tube is designed in a sharp conical streamline shape, which can reduce airflow fluctuation and turbulence and reduce flight energy consumption. Gas guide grooves are arranged around the air speed tube, which can prevent water droplets or ice crystals from adhering and improve measurement accuracy. The total pressure port is located at the front end of the shuttle-shaped drainage port, which can contact stable airflow and ensure measurement reliability; the static pressure port is arranged on the radial side of the shuttle-shaped drainage port, and multiple static pressure ports provide a redundant design. The waterproof deicing plate is provided with deicing heating wires and a micro drainage port, which are used for heating, deicing and drainage. The total pressure pipeline and the static pressure pipeline filter meltwater by means of a waterproof air permeable film, preventing the meltwater from entering the rear end pressure pipeline. The heating wires wound outside the total pressure guide pipe and the static pressure guide pipe form a series loop with the deicing heating wires, improving the heating efficiency. The tail part is provided with total pressure and static pressure tower joints with different lengths, which can save structural space and facilitate installation and maintenance. The application meets the development of lightness and miniaturization, and has the functions of low-power-consumption intelligent deicing and post-melt water drainage.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of aerospace technology, and particularly relates to an airspeed tube with deicing and drainage functions. BACKGROUND

[0002] The airspeed tube is an important sensor for measuring the flight speed of an aircraft or the like. During flight, the airspeed tube may encounter icing and water accumulation problems. Icing may cause the airspeed tube to have reduced measurement accuracy or even fail, and water accumulation may affect the measurement of the internal pressure of the airspeed tube, thereby affecting flight safety.

[0003] Currently, some existing methods for deicing may have limited effects. For example, a heating method is used for deicing, but may have problems such as uneven heating, high energy consumption, and insufficient heating; a mechanical deicing method may damage the airspeed tube, and the mechanical structure is complex and has low reliability.

[0004] For the problem of water drainage after deicing, the existing airspeed tube design is often not perfect in terms of drainage function, and cannot quickly and completely drain water, so that water accumulates in the airspeed tube, affecting the measurement performance. SUMMARY

[0005] The present application aims to provide an airspeed tube with deicing and drainage functions, which meets the requirements of lightweight and miniaturization development of the airspeed tube, and has low-power intelligent deicing and drainage functions after deicing.

[0006] The technical problem to be solved by the present application is solved by the following technical scheme:

[0007] The air speed pipe with deicing and drainage function is characterized in that: a shuttle-shaped drainage port, a waterproof deicing plate and an adapter flange are arranged in a multilayer stacking form at the front end of the air speed pipe; the shuttle-shaped drainage port and the waterproof deicing plate are sealed by a drainage port sealing gasket; the waterproof deicing plate and the adapter flange are sealed by a flange sealing gasket; a plurality of heating wire placement grooves are arranged on the back side of the waterproof deicing plate at positions corresponding to the static pressure pipeline and the total pressure pipeline, and a plurality of deicing heating wires are fixedly coiled in the heating wire placement grooves for heating the gas containing cold and wet water vapor and ice crystals from the total pressure port and the static pressure port; the total pressure pipeline is provided with a total pressure drainage hole in the vertical direction of gravity; the static pressure pipeline is provided with a static pressure drainage hole in the vertical direction of gravity; and the melted water heated by the deicing heating wires can be drained out of the air speed pipe through the drainage holes. The static pressure pipeline and the total pressure pipeline are connected at the waterproof deicing plate and the adapter flange, and a waterproof air permeable film is installed at the connection position to prevent the melted water and the water-containing and dust-containing gas from the total pressure port and the static pressure port from directly entering the respective rear end pressure pipelines; one side of the waterproof air permeable film is pasted in the corresponding counterbore of the adapter flange to prevent leakage, and the other side is pressed and reinforced by a metal pressing plate with a central air permeable hole. Four screws are used to fix the shuttle-shaped drainage port to the waterproof deicing plate and the adapter flange from the back to the front, and finally fixed on the shuttle-shaped drainage port to make the connection and fixation form an integral whole; the deicing heating wires are coiled and fixed in the heating wire placement grooves on the waterproof deicing plate; the positive electrode of the deicing heating wire and the negative electrode of the deicing heating wire are led out from the corresponding openings of the adapter flange and welded on the flange wiring board; and the flange wiring board is installed in the corresponding groove of the adapter flange by screws.

[0008] The combination of the shuttle-shaped drainage port, the waterproof deicing plate and the adapter flange is connected and fixed with the protective sleeve pipe through threads, and the protective sleeve pipe is fixed with the mounting seat through screws. The adapter flange, the protective sleeve pipe and the mounting seat form an internal sealed cavity. The total pressure pipeline in the adapter flange and the total pressure pipeline in the mounting seat are connected through a total pressure guide pipe, and the connection position is sealed by an O-ring. The static pressure pipeline in the adapter flange and the static pressure pipeline in the mounting seat are connected through a static pressure guide pipe, and the connection position is sealed by an O-ring. A plurality of turns of nickel-chromium alloy heating wires are uniformly wound on the outer cylindrical surface of the total pressure guide pipe and the static pressure guide pipe. The positive electrode of the total pressure guide pipe heating wire and the negative electrode of the static pressure guide pipe heating wire are led out from the corresponding openings of the mounting seat and welded on the mounting seat wiring board. The mounting seat wiring board is fixed in the corresponding groove of the mounting seat by screws. The negative electrode of the total pressure guide pipe heating wire and the positive electrode of the static pressure guide pipe heating wire are welded on the flange wiring board. The total pressure guide pipe heating wire, the deicing heating wire and the static pressure guide pipe heating wire form a series loop circuit. A total pressure cone joint is installed at the end of the total pressure pipeline of the mounting seat, and a static pressure cone joint is installed at the end of the static pressure pipeline of the mounting seat.

[0009] The total pressure pipe is arranged from the total pressure port at the front end of the shuttle-shaped drainage port, and after being heated by the deicing heating wire on the waterproof deicing plate and filtered by the waterproof air permeable film, the melted water is discharged from the total pressure drainage port, and the dry gas total pressure source is transported to the adapter flange. One end of the total pressure guide pipe is inserted into the corresponding hole of the total pressure pipe of the adapter flange, and the other end is inserted into the total pressure pipe of the mounting seat and transports the total pressure to the atmospheric measurement module through the total pressure tower joint at the tail of the mounting seat. The two ends of the total pressure guide pipe are sealed with O-rings installed in the grooves, respectively, with the adapter flange and the mounting seat. The total pressure guide pipe is wrapped with multiple turns of nickel-chromium alloy heating wire. The positive electrode of the total pressure guide pipe heating wire is led out from the opening at the corresponding position of the mounting seat and welded on the mounting seat wiring board. The mounting seat wiring board is installed in the corresponding groove of the mounting seat by screws. The negative electrode of the total pressure guide pipe heating wire is welded on the flange wiring board and connected in series with the deicing heating wire.

[0010] The static pressure pipe is arranged from the static pressure port at the front end of the shuttle-shaped drainage port, and after being heated by the deicing heating wire on the waterproof deicing plate and filtered by the waterproof air permeable film, the melted water is discharged from the static pressure drainage port, and the dry gas static pressure source is transported to the adapter flange. One end of the static pressure guide pipe is inserted into the corresponding hole of the static pressure pipe of the adapter flange, and the other end is inserted into the static pressure pipe of the mounting seat and transports the static pressure to the atmospheric measurement module through the static pressure tower joint at the tail of the mounting seat. The two ends of the static pressure guide pipe are sealed with O-rings installed in the grooves, respectively, with the adapter flange and the mounting seat. The static pressure guide pipe is wrapped with multiple turns of nickel-chromium alloy heating wire. The negative electrode of the static pressure guide pipe heating wire is led out from the opening at the corresponding position of the mounting seat and welded on the mounting seat wiring board. The positive electrode of the static pressure guide pipe heating wire is welded on the flange wiring board and connected in series with the deicing heating wire. From then on, the total pressure guide pipe heating wire, the deicing heating wire, and the static pressure guide pipe heating wire form a series loop through the mounting seat wiring board and the flange wiring board.

[0011] Preferably, the airspeed pipe is designed in a sharp cone shape, with a slightly thick first section, a slightly thin middle section, and a slightly thick tail section. The streamlined design not only makes the airflow more stable when flowing through the front end of the airspeed pipe, reducing airflow fluctuations and turbulence, reducing interference, and ensuring more accurate total pressure and static pressure measurements, but also effectively reduces air resistance, adapts to high-speed airflow impact, reduces flight energy consumption, and improves flight speed.

[0012] Preferably, the airspeed pipe has gas guide grooves penetrating the first section in four directions: up, down, left, and right. In cold weather conditions, the front end of the airspeed pipe is prone to icing, affecting measurement accuracy and even causing the airspeed pipe to block. The presence of the guide grooves can change the flow characteristics of the airflow, forming a thin layer of air on the surface of the airspeed pipe, preventing water droplets or ice crystals from adhering to the airspeed pipe. The guide grooves can also guide the airflow to flow more smoothly through the front end of the airspeed pipe, allowing the airflow to flow along the preset path during aircraft maneuvering or when encountering crosswinds, isolating these interference factors, reducing airflow fluctuations and turbulence, and improving total pressure and static pressure measurement accuracy.

[0013] Preferably, the total pressure port of the pitot tube is arranged at the front end of the shuttle-shaped flow guide port, so that it can first contact the relatively stable and undisturbed airflow, reduce pressure loss, improve the reliability of measurement, and adapt to different flight conditions. No matter the aircraft is in climbing, diving, turning or other flight conditions, the front end of the total pressure port can always contact the airflow relatively stably to ensure the total pressure measurement.

[0014] Preferably, the static pressure port of the pitot tube is arranged at the radial side of the shuttle-shaped flow guide port, and the three static pressure ports are uniformly arranged at an interval of 30°. Firstly, the existence of multiple static pressure ports provides a redundant design to ensure that the pitot tube can provide relatively reliable static pressure data. Secondly, multiple static pressure ports can collect static pressure data from different directions to compensate for airflow deviation and adapt to different flight attitudes.

[0015] Preferably, the waterproof and deicing plate near the total pressure port and the static pressure port at the front end of the pitot tube is provided with low-power deicing heating wire. Once icing occurs, it can quickly respond and shorten the deicing time, prevent the total pressure port and the static pressure port of the pitot tube from being blocked by ice in the cold high-altitude environment, ensure the accuracy and continuity of pressure measurement, enable the aircraft to adapt to low-temperature environment and not be limited by icing problems, and also reduce the overall energy consumption of the aircraft and improve the endurance of the aircraft.

[0016] Preferably, the waterproof and breathable membrane allows air to pass through to ensure that the total pressure source and the static pressure source can accurately conduct to the pressure sensor. At different flight altitudes and speeds, the waterproof and breathable membrane can quickly balance the internal and external pressure difference to make the measurement more accurate. The total pressure pipeline and the static pressure pipeline of the pitot tube are isolated from the warm and humid airflow after heating by the waterproof and breathable membrane at the heating part of the waterproof and deicing plate, and the melted water is discharged through the drainage holes arranged below the waterproof and breathable membrane to prevent water accumulation from interfering with pressure measurement.

[0017] Preferably, the total pressure tower joint at the tail of the pitot tube is longer than the static pressure tower joint, and the interface positions of the two are staggered in a stepped manner. The design of different lengths not only saves structural space and makes the pitot tube as a whole more lightweight, but also facilitates differentiation, enabling workers to quickly and accurately distinguish during installation and maintenance, avoiding misconnection, and improving work efficiency and accuracy. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is an exploded view of the pitot tube with deicing and drainage function of the present application;

[0019] Figure 2 is an isometric view of the pitot tube with deicing and drainage function of the present application;

[0020] Figure 3 is a schematic diagram of the heating wire arrangement of the pitot tube with deicing and drainage function of the present application;

[0021] Figure 4 Figure 1 is a schematic diagram of a waterproof deicing plate structure;

[0022] In the figure: 1. Shuttle-shaped drainage port; 2. Waterproof deicing plate; 3. Adapter flange; 4. Drainage port sealing gasket; 5. Flange sealing gasket; 6. Heating wire installation slot; 7. Deicing heating wire; 8. Total pressure port; 9. Static pressure port; 10. Total pressure drainage hole; 11. Static pressure drainage hole; 12. Waterproof air-permeable membrane; 13. Metal pressing plate; 14. Deicing heating wire anode; 15. Deicing heating wire cathode; 16. Flange terminal block; 17. Protective sleeve; 18. Mounting seat; 19. Total pressure conduit; 20. O-ring; 21. Static pressure conduit; 22. Total pressure conduit heating wire; 23. Static pressure conduit heating wire; 24. Total pressure conduit heating wire anode; 25. Total pressure conduit heating wire cathode; 26. Static pressure conduit heating wire anode; 27. Static pressure conduit heating wire cathode; 28. Mounting seat terminal block; 29. Total pressure cone joint; 30. Static pressure cone joint; 31. Flow guide groove. DETAILED DESCRIPTION

[0023] The application will be further described in detail below in conjunction with the embodiments and with reference to the accompanying drawings.

[0024] The air speed pipe with deicing and drainage function is characterized in that: the shuttle-shaped drainage port (1), the waterproof deicing plate (2) and the adapter flange (3) are arranged in a multilayer stacking form at the front end of the air speed pipe; the shuttle-shaped drainage port (1) and the waterproof deicing plate (2) are sealed through the drainage port sealing gasket (4); the waterproof deicing plate (2) and the adapter flange (3) are sealed through the flange sealing gasket (5); a plurality of heating wire placement grooves (6) are arranged on the back side of the waterproof deicing plate (2) at positions corresponding to the static pressure pipeline and the total pressure pipeline, and a plurality of deicing heating wires (7) are fixedly coiled in the heating wire placement grooves (6) for heating the gas containing cold and wet water vapor and ice crystals from the total pressure port (8) and the static pressure port (9); the total pressure pipeline is provided with a total pressure drainage hole (10) in the vertical direction of gravity; the static pressure pipeline is provided with a static pressure drainage hole (11) in the vertical direction of gravity; the melted water after being heated by the deicing heating wire (7) can be drained out of the air speed pipe through the drainage holes. The static pressure pipeline and the total pressure pipeline are connected at the positions of the waterproof deicing plate (2) and the adapter flange (3), and a waterproof air permeable film (12) is installed to prevent the melted water and the water-containing and dust-containing gas from the total pressure port (8) and the static pressure port (9) from directly entering the respective rear end pressure pipelines; one side of the waterproof air permeable film (12) is pasted in the corresponding counterbore of the adapter flange (3) to prevent leakage, and the other side is pressed and reinforced by a center metal pressing plate (13) with air holes. Four screws are arranged from the adapter flange (3) to the front end, penetrating through the flange sealing gasket (5), the waterproof deicing plate (2) and the drainage port sealing gasket (4) and finally fixed on the shuttle-shaped drainage port (1) to connect and fix them to form an integral whole; the deicing heating wire (7) is coiled and fixed in the heating wire placement groove (6) on the waterproof deicing plate (2); the positive electrode (14) and the negative electrode (15) of the deicing heating wire are connected to the flange wiring plate (16) through the openings in the corresponding positions of the adapter flange (3) and are welded on the flange wiring plate (16); and the flange wiring plate (16) is installed in the corresponding groove of the adapter flange (3) through screws.

[0025] The combination of the shuttle-shaped drainage port (1), the waterproof deicing plate (2) and the adapter flange (3) is connected and fixed with the protective sleeve (17) through threads, the protective sleeve (17) is fixed with the mounting seat (18) through screws, the adapter flange (3), the protective sleeve (17) and the mounting seat (18) form an internal sealed cavity, the total pressure pipeline in the adapter flange (3) is connected with the total pressure pipeline in the mounting seat through the total pressure guide pipe (19), the connection part is sealed by the deformation of the O-shaped ring (20), the static pressure pipeline in the adapter flange (3) is connected with the static pressure pipeline in the mounting seat through the static pressure guide pipe (21), the connection part is sealed by the deformation of the O-shaped ring (20), the total pressure guide pipe (19) and the static pressure guide pipe (21) are uniformly wound with multiple turns of nickel-chromium alloy heating wires on the outer cylindrical surface, the positive electrode (24) of the total pressure guide pipe heating wire and the negative electrode (27) of the static pressure guide pipe heating wire are led out from the corresponding openings of the mounting seat (18) and welded on the mounting seat wiring board (28), the mounting seat wiring board (28) is fixed in the corresponding groove of the mounting seat (18) through screws, the negative electrode (25) of the total pressure guide pipe heating wire is welded on the flange wiring board (16) together with the positive electrode (26) of the static pressure guide pipe heating wire, and the total pressure guide pipe heating wire (22), the deicing heating wire (7) and the static pressure guide pipe heating wire (23) form a series loop.

[0026] The total pressure pipeline starts from the total pressure port (8) at the front end of the shuttle-shaped drainage port (1), is heated by the deicing heating wire (7) on the waterproof deicing plate (2) and filtered by the waterproof air permeable film (12), and then melts water from the total pressure drain port (10) to the outside, and sends dry gas to the adapter flange (3) as a total pressure pressure source, one end of the total pressure guide pipe (19) is inserted into the corresponding inner hole of the total pressure pipeline in the adapter flange (3), the other end is inserted into the total pressure pipeline in the mounting seat (18) and sends the total pressure to the atmospheric measurement module through the total pressure bell joint (29) at the tail of the mounting seat (18), the two ends of the total pressure guide pipe (19) are sealed with the adapter flange (3) and the mounting seat (18) through the O-shaped rings (20) installed in the grooves, multiple turns of nickel-chromium alloy heating wires are wound outside the total pressure guide pipe (19), the positive electrode (24) of the total pressure guide pipe heating wire is led out from the corresponding opening of the mounting seat (18) and welded on the mounting seat wiring board (28), the mounting seat wiring board (28) is installed in the corresponding groove of the mounting seat (18) through screws, and the negative electrode (25) of the total pressure guide pipe heating wire is welded on the flange wiring board (16) and connected in series with the deicing heating wire (7).

[0027] The static pressure pipe is uniformly arranged with three static pressure ports (9) at an interval of 30° from the radial side edge of the shuttle-shaped drainage port (1), and the melted water is discharged from the static pressure drainage port (11) to the outside after being filtered by the deicing heating wire (7) on the waterproof deicing plate (2) and the waterproof air permeable film (12), and the dry gas static pressure source is transported to the adapter flange (3), one end of the static pressure guide pipe (21) is inserted into the corresponding hole of the static pressure pipe of the adapter flange (3), the other end is inserted into the static pressure pipe of the mounting seat (18) and the static pressure pipe is connected to the atmospheric measurement module through the tail static pressure tower joint (30) of the mounting seat (18), the two ends of the static pressure guide pipe (21) are sealed with the adapter flange (3) and the mounting seat (18) through the O-shaped ring (20) installed in the groove, the static pressure guide pipe (21) is wrapped with multiple turns of nickel-chromium alloy heating wire, the negative electrode (27) of the static pressure guide pipe heating wire is led out from the opening of the corresponding position of the mounting seat (18) and welded on the mounting seat wiring board (28), and the positive electrode (26) of the static pressure guide pipe heating wire is welded on the flange wiring board (16) and connected in series with the deicing heating wire (7), and the total pressure guide pipe heating wire (22), the deicing heating wire (7) and the static pressure guide pipe heating wire (23) form a series loop through the mounting seat wiring board (28) and the flange wiring board (16).

[0028] Preferably, the airspeed tube is designed in a sharp cone shape, with an aerodynamic structure layout of a slightly thick first section, a slightly thin middle section and a slightly thick tail section. The streamlined design not only makes the airflow more stable when flowing through the front end of the airspeed tube, reduces airflow fluctuations and turbulence, reduces interference, and ensures more accurate total pressure and static pressure measurements, but also effectively reduces air resistance, adapts to high-speed airflow impact, reduces flight energy consumption, and improves flight speed.

[0029] Preferably, the airspeed tube is designed in a sharp cone shape, with an aerodynamic structure layout of a slightly thick first section, a slightly thin middle section and a slightly thick tail section. The streamlined design not only makes the airflow more stable when flowing through the front end of the airspeed tube, reduces airflow fluctuations and turbulence, reduces interference, and ensures more accurate total pressure and static pressure measurements, but also effectively reduces air resistance, adapts to high-speed airflow impact, reduces flight energy consumption, and improves flight speed.

[0030] Preferably, the total pressure port (8) of the airspeed tube is arranged at the most front end of the shuttle-shaped drainage port (1), so that it can first contact the relatively stable and undisturbed airflow, reduce pressure loss, improve measurement reliability, and adapt to different flight conditions. Whether the aircraft is in climbing, diving, turning or other flight conditions, the front end total pressure port (8) can always relatively stably contact the airflow to ensure total pressure measurement.

[0031] Preferably, the pitot static pressure ports (9) are arranged on the radial side of the shuttle-shaped flow guide port (1), and three pitot static pressure ports (9) are evenly arranged at an interval of 30°. Firstly, the existence of multiple pitot static pressure ports (9) provides a redundant design to ensure that the pitot tube can provide relatively reliable static pressure data. Secondly, multiple pitot static pressure ports (9) can collect static pressure data from different directions to compensate for airflow deviation and adapt to different flight attitudes.

[0032] Preferably, the waterproof deicing plate (2) located near the total pressure port (8) and the static pressure port (9) at the front end of the pitot tube is provided with low-power deicing heating wires (7). Once icing occurs, it can not only respond quickly and shorten the deicing time, but also prevent the total pressure port (8) and the static pressure port (9) of the pitot tube from being blocked by ice in a cold high-altitude environment, ensure the accuracy and continuity of pressure measurement, and make the aircraft adapt to low-temperature environment and not be limited by icing problems. In addition, it can also reduce the overall energy consumption of the aircraft and improve the endurance of the aircraft.

[0033] Preferably, the waterproof air-permeable membrane (12) allows air to pass through, ensuring that the total pressure source and the static pressure source can accurately conduct to the pressure sensor. At different flight altitudes and speeds, the waterproof air-permeable membrane (12) can quickly balance the internal and external pressure difference, making the measurement more accurate. The pitot tube total pressure pipeline and the pitot tube static pressure pipeline are isolated from the heated warm and humid airflow by the waterproof air-permeable membrane (12) at the heating part of the waterproof deicing plate (2), and the melted water is discharged through the drain holes arranged below the waterproof air-permeable membrane (12) respectively, preventing water accumulation from interfering with pressure measurement.

[0034] Preferably, the total pressure cone joint (29) at the tail of the pitot tube is longer than the static pressure cone joint (30), and the interface positions of the two are staggered in a stepped manner. The design of different lengths not only saves structural space and makes the pitot tube more lightweight as a whole, but also facilitates differentiation, allowing workers to quickly and accurately distinguish during installation and maintenance, avoiding misconnection, and improving work efficiency and accuracy.

Claims

1. A pitot tube with deicing and drainage functions, characterized in that: It includes a shuttle-shaped drainage port, a waterproof de-icing plate, and a transition flange arranged in a multi-layer stacked form at the front end of the pitot tube, wherein the shuttle-shaped drainage port and the waterproof de-icing plate are sealed by a drainage port sealing gasket, and the waterproof de-icing plate and the transition flange are sealed by a flange sealing gasket. The back side of the waterproof de-icing plate is provided with a plurality of heating wire placement grooves at the corresponding positions of the static pressure pipeline and the total pressure pipeline, and a plurality of de-icing heating wires are coiled and fixed therein to heat the gas containing cold and wet water vapor and ice crystals from the total pressure port and the static pressure port. The total pressure pipeline is provided with a total pressure drain hole in the vertical direction of gravity, and the static pressure pipeline is provided with a static pressure drain hole in the vertical direction of gravity. The melted water heated by the de-icing heating wire can be discharged from the pitot tube through the drain hole; the static pressure pipeline and the total pressure pipeline are connected at the waterproof de-icing plate and the transition flange. The joint is installed with a waterproof breathable membrane to prevent melt water and water- and dust-containing gases from the total pressure port and static pressure port from directly entering their respective rear-end pressure pipes. The adhesive-backed side of the waterproof breathable membrane is pasted in the corresponding countersunk hole of the adapter flange to prevent leakage, and the other side is tightened and reinforced by a metal pressure plate with a breathable hole in the center; four screws pass from the adapter flange from back to front through the flange sealing gasket, waterproof de-icing plate, and drainage port sealing gasket and are finally fixed on the shuttle-shaped drainage port to connect and fix them to form a whole. The de-icing heating wire is coiled and fixed in the heating wire placement groove on the waterproof de-icing plate. The positive and negative poles of the de-icing heating wire are led out from the openings at the corresponding positions of the adapter flange and welded to the flange terminal board. The flange terminal board is installed in the corresponding groove of the adapter flange by screws; The shuttle-shaped drainage port, waterproof de-icing plate and adapter flange assembly are fixed to the protective sleeve through threaded connection, and the protective sleeve is fixed to the mounting seat through screws. The adapter flange, protective sleeve and mounting seat form an internal sealed cavity. The total pressure pipe in the adapter flange inside the cavity is connected to the total pressure pipe of the mounting seat through the total pressure conduit, and the connection part is sealed by an O-ring deformation. The static pressure pipe in the adapter flange is connected to the static pressure pipe of the mounting seat through the static pressure conduit, and the connection part is sealed by an O-ring deformation. The total pressure conduit and the outer cylindrical surface of the static pressure conduit are sealed. Evenly wind multiple turns of nickel-chromium alloy heating wire, the positive electrode of the total pressure duct heating wire and the negative electrode of the static pressure duct heating wire are led out from the corresponding openings of the mounting base and welded to the mounting base terminal board, the mounting base terminal board is fixed in the corresponding groove of the mounting base by screws, the negative electrode of the total pressure duct heating wire and the positive electrode of the static pressure duct heating wire are welded to the flange terminal board, and the total pressure duct heating wire, de-icing heating wire and static pressure duct heating wire form a series circuit; a total pressure pagoda connector is installed at the end of the total pressure pipeline of the mounting base, and a static pressure pagoda connector is installed at the end of the static pressure pipeline of the mounting base; There are gas guide grooves running through the first section of the pitot tube in the four directions of up, down, left and right. The existence of the guide grooves can change the flow characteristics of the airflow.

2. The pitot tube with deicing and drainage functions according to claim 1, characterized in that: Its appearance is a pointed cone-shaped streamlined design, which not only makes the airflow more stable when passing through the front end of the pitot tube, reduces the fluctuation and turbulence of the airflow, reduces interference, and ensures that the measured total pressure and static pressure are more accurate, but also can effectively reduce air resistance, adapt to the impact of high-speed airflow, reduce flight energy consumption, and increase flight speed.

3. The pitot tube with deicing and drainage functions according to claim 1, characterized in that: The total pressure port is set at the front end of the pitot tube so that it can be the first to contact the relatively stable and undisturbed airflow, reducing pressure loss, improving measurement reliability, and being able to adapt to different flight conditions. Regardless of whether the aircraft is in climbing, diving or turning flight conditions, the total pressure port at the front end can always be in relatively stable contact with the airflow to ensure total pressure measurement.

4. The pitot tube with deicing and drainage functions according to claim 1, characterized in that: The static pressure port is set on the radial side of the shuttle-shaped drainage port, and the three static pressure ports are evenly arranged at 30° intervals. First, the existence of multiple static pressure ports provides a redundant design to ensure that the pitot tube can provide relatively reliable static pressure data. Secondly, multiple static pressure ports can collect static pressure data from different directions, compensate for airflow deviation, and adapt to different flight attitudes.

5. The pitot tube with deicing and drainage functions according to claim 1, characterized in that: A low-power de-icing heating wire is installed in the waterproof de-icing plate located near the total pressure port and static pressure port at the front end of the pitot tube, where ice is most likely to form. Once ice forms, it can not only respond quickly, shorten the de-icing time, and ensure the accuracy and continuity of pressure measurement, but also reduce the overall energy consumption of the aircraft and improve the aircraft's endurance.

6. The pitot tube with deicing and drainage functions according to claim 1, characterized in that: The waterproof breathable membrane used in its total pressure pipe and static pressure pipe allows air to pass freely, ensuring that the total pressure source and static pressure source can be accurately transmitted to the pressure sensor. At different flight altitudes and flight speeds, the waterproof breathable membrane can quickly balance the internal and external pressure differences, making the measurement more accurate; the pitot tube total pressure pipe and static pressure pipe are isolated from the heated warm and humid air flow by waterproof breathable membranes at the heating part of the waterproof de-icing plate, and the melt water is discharged through the drainage holes set under the waterproof breathable membrane to prevent accumulated water from interfering with pressure measurement.

7. The pitot tube with deicing and drainage functions according to claim 1, characterized in that: The total pressure barge connector at the tail of the pitot tube is longer than the static pressure barge connector, and the interface positions of the two are staggered in a stepped manner. The design of different lengths not only saves structural space, makes the pitot tube lighter as a whole, but also makes it easy to distinguish. During the installation and maintenance process, workers can quickly and accurately distinguish them, avoid wrong connections, and improve work efficiency and accuracy.

Images