Air speed tube structure for use in subzero environments
By introducing a heating system and a two-stage drainage structure into the pitot tube, combined with intelligent control, the problem of pitot tube icing in low-temperature environments has been solved, achieving high measurement accuracy and safety, reducing energy consumption, and improving the flight reliability of UAVs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- ZERO ONE FLIGHT (NANJING) TECHNOLOGY CO LTD
- Filing Date
- 2026-05-28
- Publication Date
- 2026-07-10
AI Technical Summary
Existing pitot tubes are prone to icing in high-altitude, cold, humid, and low-temperature winter environments, which can lead to decreased measurement accuracy or failure, affecting the flight safety of UAVs.
A pitot tube structure including a heating system, a two-stage drainage system, and intelligent control was designed. It adopts a heating film and temperature sensor for adaptive heating, and combined with the two-stage drainage structure, it ensures that the measurement accuracy is not affected in low-temperature environments.
Maintaining pitot tube measurement accuracy in low-temperature environments, reducing energy consumption by more than 60%, improving drainage function, enhancing heating uniformity and measurement reliability, and ensuring safe flight of UAVs in extreme climates.
Smart Images
Figure CN122361841A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of pitot tube technology, and in particular to a pitot tube structure for use in sub-zero environments. Background Technology
[0002] With the rapid development and widespread application of drone technology, manufacturers often focus on improving flight performance, increasing payload capacity, and optimizing control systems during the design and manufacturing process. However, they often fail to give sufficient attention to details in special environments, such as the design and protection of the pitot tube. Especially under extreme climatic conditions such as high altitude, extreme cold, high humidity, and low winter temperatures, the pitot tube is prone to icing due to sudden temperature drops and humidity. Once the pressure-sensing area of the pitot tube is covered by ice or water enters, it directly interferes with the accurate acquisition of total pressure and static pressure, causing serious deviations in the measurement data. This data distortion not only misleads the flight control system's judgment of airspeed but may also trigger a series of chain reactions, such as loss of flight attitude control and increased navigation errors, ultimately seriously threatening the flight safety of the drone and even leading to a crash. Such accidents not only cause significant property damage to the drone itself but may also affect ground facilities, other aircraft, and even endanger the safety of personnel, resulting in incalculable casualties and economic losses. Therefore, it is essential to pay close attention to the reliability of pitot tubes in complex environments and to take effective anti-icing and waterproofing measures to ensure that UAVs can operate safely and stably under various conditions. Summary of the Invention
[0003] The purpose of this invention is to address the problems existing in the background technology by proposing a pitot tube structure applicable to sub-zero environments. The technical problem this invention aims to solve is to overcome the shortcomings of existing technologies and provide a pitot tube structure design suitable for high-altitude, extremely cold, high-humidity, and winter flight environments. This design can efficiently maintain the measurement accuracy of the pitot tube and ensure the accuracy of airspeed measurements even in harsh temperature environments, thereby preventing structural failures.
[0004] The technical solution of this invention is to propose a pitot tube structure for use in sub-zero environments, comprising: The housing assembly has a dynamic pressure port at its end and an airflow channel formed therein; the dynamic pressure port is connected to the airflow channel, and a static pressure port for sensing atmospheric static pressure is provided in the airflow channel; The dynamic pressure tube assembly, located inside the housing assembly, is used to sense the total air pressure; the dynamic pressure tube assembly has an internal partition structure to separate the dynamic pressure tube assembly into a dynamic pressure chamber. The heating system includes a heating element and a temperature sensor mounted on the hydrodynamic tube assembly, and a control unit that automatically adjusts the heating power based on the feedback signal from the temperature sensor. A two-stage drainage system includes at least one drain hole disposed on the housing assembly and a drainage guide structure disposed on the dynamic pressure pipe assembly; the drainage guide structure corresponds to the position of the drain hole and is used to guide the liquid accumulated inside the dynamic pressure pipe assembly to the drain hole for discharge; The rear cover assembly is connected to the rear end of the outer shell assembly and has internal pressure outlet channels that communicate with the dynamic pressure tube assembly and the static pressure hole respectively. A pipe connector, located on the rear cover assembly, is used to connect the pressure outlet channel to an external pressure sensor.
[0005] Preferably, the housing assembly includes a tubular housing; The outer shell of the tube is a gradually changing cylindrical structure with stepped holes inside, and the transition between the large and small holes is made with a 45-degree chamfer. The outer shell of the pipe is provided with a first dynamic pressure drain hole, a second dynamic pressure drain hole, and a static pressure hole.
[0006] Preferably, the first dynamic pressure drain hole is located at the inlet of the outer shell of the pipe body, close to the head of the core dynamic pressure pipe; The second dynamic pressure drain hole is located at the middle of the outer shell of the pipe.
[0007] Preferably, the static pressure hole includes an upper static pressure hole and a lower static pressure hole; the upper and lower static pressure holes are aligned and installed. Three upper static pressure holes are provided and arranged symmetrically on the left and right at 15-degree intervals. Five static pressure holes are provided, arranged symmetrically on the left and right sides at 23-degree intervals; The static pressure hole is installed at the rear end of the second dynamic pressure drainage hole.
[0008] Preferably, the hydrodynamic tube assembly includes a core hydrodynamic tube and an extension tube; The core hydrodynamic tube is cylindrical, with a blind hole at the head and a water vapor barrier in the middle; after the water vapor barrier, there is a straight hole and an internal thread at the end. The core hydrodynamic tube is connected to the extension tube via an internal thread; The core dynamic pressure tube, from front to back, consists of the temperature sensor fixing position, heating film fixing position, heating film pad fixing position, drainage limit groove, sensor wire harness through-wall hole, sealing ring fixing groove, and fixing screw hole. The extension tube is cylindrical, with an external thread at the front end that connects to the core dynamic pressure tube, and two sealing ring fixing grooves at the end.
[0009] Preferably, the heating element in the heating system is a heating film; the control unit is integrated in the heating control box; The heating film pad fixing position adopts a four-equal distribution design, so that the heating film 8 is evenly distributed in the circumferential direction; the heating film adopts a PI film heating sheet with a thickness of 0.09-0.27mm and a heating power density of 1.0W / cm²; the temperature sensor is a high-precision thermistor with a temperature measurement range of -60℃ to 300℃ and a measurement accuracy of ±1℃. The temperature sensor is set at the temperature sensor fixing position, adjacent to the heating film fixing position; The heating control box automatically adjusts the heating power based on the feedback signal from the temperature sensor, with a power adjustment range of 0-65W; The heating system also includes a heat-conducting cover to enclose the heating film, provide stable support, and transfer the heat from the heating film to the outer shell of the tube.
[0010] Preferably, the first dynamic pressure drain hole and the second dynamic pressure drain hole are combined to form a two-stage drainage system; The drainage limiting groove and drainage hole on the core dynamic pressure pipe are arranged concentrically; The 45-degree chamfer transition of the stepped hole inside the head of the pipe body is used to allow water to flow to the drain hole. The drain hole is located at the lowest point of the bottom of the pipe shell, and the water flows to the drain hole under the action of gravity.
[0011] Preferably, the rear cover assembly includes a pitot tube rear cover; The pitot tube rear cover is designed with a cylindrical head chamfer, and the cylindrical surface is evenly distributed with the body fixing thread connection holes and the outer shell fixing thread holes. The rear cover of the airspeed tube has a cross-shaped groove, the middle dynamic pressure hole is 20mm deep, and the end dynamic pressure hole intersects with the middle dynamic pressure hole; The end dynamic pressure hole is threaded and has a sensor wiring harness through hole; the small hole of the static pressure hole is directly connected to the large hole of the end static pressure hole, and the end of the end static pressure hole is threaded.
[0012] Preferably, the pipe fittings include dynamic pressure pagoda heads and static pressure pagoda heads; Both the dynamic pressure pagoda head and the static pressure pagoda head have threads at the front end and through holes inside. Both ends have two stepped anti-reverse steps to prevent the connecting pipes from falling off.
[0013] Preferably, the pipe fitting also includes a connecting wire; The connecting wires pass through the rear cover assembly to power the internal devices and transmit control signals.
[0014] Compared with the prior art, the present invention has the following beneficial technical effects: In existing technologies, icing can lead to decreased accuracy or even failure of pitot tube measurements. This invention, however, ensures measurement accuracy remains unaffected in low-temperature environments through a unique heating structure and intelligent control. It also reduces energy consumption: existing heating systems consume over 30% of total power, and anti-icing systems consume 15%-20% of power during a single flight charge. This invention, through optimized design, reduces energy consumption by over 60%. It improves heating uniformity: existing technologies suffer from uneven heating, while this invention's four-part uniform distribution design ensures uniform heating. It enhances drainage: existing technologies have inadequate drainage functions, failing to quickly and thoroughly remove moisture. This invention's dual-stage drainage structure doubles the drainage capacity. Finally, it achieves intelligent control: existing technologies often use fixed-power heating, while this invention employs adaptive intelligent control, automatically adjusting the heating power according to the ambient temperature. Attached Figure Description
[0015] Figure 1 This is an overall schematic diagram of the airspeed tube structure in an embodiment of the present invention; Figure 2 This is a schematic diagram of the internal structure of the airspeed tube in an embodiment of the present invention; Figure 3 This is a schematic diagram of the unfolded structure of the airspeed tube in an embodiment of the present invention; Figure 4 This is a schematic diagram of the tube shell design structure in an embodiment of the present invention; Figure 5 This is a schematic diagram of the design structure of the heating film protective heat-conducting cover in an embodiment of the present invention; Figure 6 This is a schematic diagram of the core dynamic pressure tube design structure in an embodiment of the present invention; Figure 7 This is a schematic diagram of the core dynamic pressure extension tube design structure in an embodiment of the present invention; Figure 8 This is a schematic diagram of the design structure of the airspeed tube rear cover in an embodiment of the present invention; Figure 9 This is a schematic diagram of the dynamic pressure pagoda head design structure in an embodiment of the present invention; Figure 10 This is a schematic diagram of the static pressure pagoda head design structure in an embodiment of the present invention.
[0016] Reference numerals in the attached diagram: 1. Outer shell of the tube; 2. Heat-conducting cover; 3. Core dynamic pressure tube; 4. Extension tube; 5. Piston tube rear cover; 6. Dynamic pressure pagoda head; 7. Static pressure pagoda head; 8. Heating film; 9. Temperature sensor; 10. Core dynamic pressure tube sealing ring; 11. Dynamic pressure hole; 12. Connecting wire; 13. First dynamic pressure drain hole; 14. Second dynamic pressure drain hole; 15. Countersunk hole; 16. Screw hole; 17. Water vapor barrier; 18. Dynamic pressure chamber; 19. Dynamic pressure chamber outlet; 20. Lower static pressure hole. Detailed Implementation Example 1
[0017] like Figure 1 As shown in this embodiment, a pitot tube structure for use in sub-zero environments includes: The outer casing assembly has a dynamic pressure hole 11 at its end and an airflow channel formed therein; the dynamic pressure hole 11 is connected to the airflow channel, and a static pressure hole 20 for sensing atmospheric static pressure is provided in the airflow channel; The dynamic pressure tube assembly, located inside the housing assembly, is used to sense the total air pressure; the dynamic pressure tube assembly has a partition structure inside to separate the dynamic pressure tube assembly into a dynamic pressure chamber 18. The heating system includes a heating element and a temperature sensor 9 mounted on the dynamic pressure tube assembly, and a control unit that automatically adjusts the heating power based on the feedback signal from the temperature sensor. A two-stage drainage system includes at least one drain hole disposed on the housing assembly and a drainage guide structure disposed on the dynamic pressure pipe assembly; the drainage guide structure corresponds to the position of the drain hole and is used to guide the liquid accumulated inside the dynamic pressure pipe assembly to the drain hole for discharge; The rear cover assembly is connected to the rear end of the outer shell assembly and has internal pressure outlet channels that communicate with the dynamic pressure tube assembly and the static pressure hole respectively. A pipe connector, located on the rear cover assembly, is used to connect the pressure outlet channel to an external pressure sensor.
[0018] In this embodiment, when the pitot tube is operating, the oncoming airflow enters the dynamic pressure tube assembly through the dynamic pressure port 11 at the end of the tube shell 1, establishing total pressure in the dynamic pressure chamber 18 formed by the internal partition; simultaneously, the static pressure port 20 on the shell senses the atmospheric static pressure. The total pressure and static pressure are transmitted to an external pressure sensor through the pressure outlet channel of the rear cover assembly and the pipe connectors for calculating airspeed. The heating system automatically adjusts the heating element power based on temperature sensor feedback to prevent icing. The two-stage drainage system utilizes the drainage guide structure on the dynamic pressure tube assembly in conjunction with the drain port on the shell to automatically drain the liquid accumulated inside the tube, ensuring accurate and reliable pressure measurement under low temperature and high humidity conditions.
[0019] In this embodiment, as Figure 2 As shown, the housing assembly includes a tubular housing 1; as Figure 4As shown, the outer shell 1 of the pipe is a gradually changing cylindrical structure with stepped holes inside, and the transition between the large and small holes is achieved with a 45-degree chamfer. The outer shell 1 has a first dynamic pressure drain hole 13, a second dynamic pressure drain hole 14, and a static pressure hole 20. The first dynamic pressure drain hole 13 is located at the inlet of the outer shell 1, near the head of the core dynamic pressure pipe 3; the second dynamic pressure drain hole 14 is located at the middle of the outer shell 1. The static pressure hole 20 includes an upper static pressure hole and a lower static pressure hole; the upper and lower static pressure holes are aligned and installed; three upper static pressure holes are provided, arranged symmetrically at 15-degree intervals; five lower static pressure holes are provided, arranged symmetrically at 23-degree intervals; the static pressure hole 20 is installed at the rear end of the second dynamic pressure drain hole 14. The first dynamic pressure drain hole 13 and the second dynamic pressure drain hole 14 together form a two-stage drainage system; the drainage limiting groove on the core dynamic pressure pipe 3 is arranged concentrically with the drain hole; the 45-degree chamfer transition of the stepped hole inside the head of the pipe shell 1 is used for water to flow to the drain hole; the drain hole is set at the lowest position at the bottom of the pipe shell 1, and guides the water flow to the drain hole under the action of gravity.
[0020] like Figure 2-3 As shown, the hydrodynamic tube assembly includes a core hydrodynamic tube 3 and an extension tube 4; as Figure 6 As shown, the core dynamic pressure tube 3 is cylindrical, with a blind hole at the head and a water vapor barrier 17 in the middle; a straight hole is located behind the water vapor barrier 17, and an internal thread is provided at the end; the core dynamic pressure tube 3 is connected to the extension tube 4 through the internal thread; from front to back, the core dynamic pressure tube 3 consists of a temperature sensor fixing position, a heating film fixing position, a heating film pad fixing position, a drainage limiting groove, a sensor harness through-wall hole, a sealing ring fixing groove, and a fixing screw hole; the dynamic pressure chamber 18 is a rear chamber separated by the water vapor barrier 17 inside the core dynamic pressure tube. In this embodiment, when the airflow enters through the blind hole at the head, the water vapor barrier 17 blocks the condensate or moisture at the front, while the pure total pressure airflow enters the dynamic pressure chamber 18 for temporary storage and establishes a stable total pressure. The dynamic pressure chamber output port 19 is located at the rear end of the dynamic pressure chamber 18 and is connected to the rear extension tube 4; the total pressure gas is transmitted backward through the output port 19, and finally delivered to the external pressure sensor through the extension tube 4 and the rear cover assembly. The water vapor barrier 17 effectively prevents moisture from entering the dynamic pressure chamber 18, ensuring that the gas inside the chamber is dry and pure; the output port 19 of the dynamic pressure chamber ensures stable transmission of the total pressure signal and avoids measurement errors caused by moisture interference or obstructed gas path. Figure 7 As shown, the extension tube 4 is cylindrical, with an external thread at the front end that connects to the core dynamic pressure tube 3, and two sealing ring fixing grooves at the end.
[0021] In this embodiment, the blind hole at the head of the core dynamic pressure tube directly senses the total airflow pressure. The water vapor barrier in the middle isolates the front water vapor from the rear pressure channel, preventing condensation or moisture from interfering with the dynamic pressure measurement. At the same time, the straight-through hole behind the barrier ensures that the total pressure is smoothly transmitted to the extension tube and the rear cover assembly. A double sealing ring fixing groove is provided at the end of the extension tube to form a reliable airtight connection with the rear cover. The water vapor barrier structure effectively prevents moisture from entering the pressure sensing area, improving measurement stability in harsh environments. The drainage limiting groove and the outer shell drainage hole work together to form a two-stage drainage system, which can automatically drain water accumulated in the tube. The heating film is evenly distributed in four parts, and works with the temperature sensor to achieve uniform heating and intelligent temperature control, preventing icing. The integrated sensor harness through-wall hole and sealing ring fixing groove simplify internal wiring and assembly. The overall structure is compact, highly reliable, and significantly enhances the adaptability of the pitot tube in low temperature and high humidity environments.
[0022] In this embodiment, the heating element in the heating system is a heating film 8; the control unit is integrated in the heating control box; the heating film pad fixing position adopts a four-equal distribution design, so that the heating film 8 is evenly distributed in the circumferential direction; the heating film 8 uses a PI film heating sheet with a thickness of 0.09-0.27mm and a heating power density of 1.0W / cm²; the temperature sensor 9 is a high-precision thermistor with a temperature measurement range of -60℃ to 300℃ and a measurement accuracy of ±1℃; the temperature sensor 9 is set at the temperature sensor fixing position, adjacent to the heating film fixing position; the heating control box automatically adjusts the heating power based on the feedback signal from the temperature sensor 9, with a power adjustment range of 0-65W; Figure 5 As shown, the heating system also includes a heat-conducting cover 2, which is used to wrap the heating film 8, provide stable support, and transfer the heat of the heating film 8 to the outer shell 1 of the tube.
[0023] like Figure 8 As shown, the rear cover assembly includes a pitot tube rear cover 5; the pitot tube rear cover 5 is designed with a cylindrical head chamfer, and the front and rear of the cylindrical surface are evenly distributed with body fixing threaded connection holes and housing fixing threaded holes; the pitot tube rear cover 5 is provided with a cross groove, the middle dynamic pressure hole is 20mm deep, and the end dynamic pressure hole intersects with the middle dynamic pressure hole; the end dynamic pressure hole is provided with threads and a sensor wire harness through hole; the small hole of the static pressure hole is directly connected to the large hole of the end static pressure hole, and the end of the end static pressure hole is provided with threads.
[0024] like Figure 9-10 As shown, the pipe connector includes a dynamic pressure pagoda head 6 and a static pressure pagoda head 7; both the dynamic pressure pagoda head 6 and the static pressure pagoda head 7 have threads at the front end and through holes inside, and both have two stepped anti-reverse steps at the end to prevent the connected pipe from falling off. The pipe connector also includes a connecting wire 12; the connecting wire 12 passes through the rear cover assembly to supply power to the internal equipment and transmit control signals.
[0025] This invention integrates an intelligent heating system and a dual-stage drainage system to actively prevent icing in low-temperature and high-humidity environments (-60℃), avoiding blockage of the total pressure / static pressure orifices and ensuring airspeed measurement accuracy. The four-part evenly distributed heating and closed-loop control by the temperature sensor ensure uniform heating and reduced energy consumption. The dual-stage drainage structure, combined with a 45° chamfered guide, can automatically drain water accumulated in the pipes, improving drainage efficiency. The overall structure is compact and highly reliable, significantly improving the flight safety of UAVs in extreme weather conditions.
[0026] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.
Claims
1. A pitot tube structure for use in sub-zero environments, characterized in that, include: The outer casing assembly has a dynamic pressure hole (11) at its end and an airflow channel formed therein; the dynamic pressure hole (11) is connected to the airflow channel, and a static pressure hole (20) for sensing atmospheric static pressure is provided in the airflow channel. The dynamic pressure tube assembly is located inside the outer shell assembly and is used to sense the total air pressure. The dynamic pressure tube assembly is provided with a partition structure to separate the dynamic pressure tube assembly into a dynamic pressure chamber (18). The heating system includes a heating element and a temperature sensor (9) mounted on the hydrodynamic tube assembly, and a control unit that automatically adjusts the heating power based on the feedback signal from the temperature sensor. A two-stage drainage system includes at least one drain hole disposed on the housing assembly and a drainage guide structure disposed on the dynamic pressure pipe assembly; the drainage guide structure corresponds to the position of the drain hole and is used to guide the liquid accumulated inside the dynamic pressure pipe assembly to the drain hole for discharge; The rear cover assembly is connected to the rear end of the outer shell assembly and has internal pressure outlet channels that communicate with the dynamic pressure tube assembly and the static pressure hole respectively. A pipe connector, located on the rear cover assembly, is used to connect the pressure outlet channel to an external pressure sensor.
2. The pitot tube structure for sub-zero environments according to claim 1, characterized in that, The housing assembly includes the tube housing (1); The outer shell of the tube (1) is a gradually changing cylindrical structure with stepped holes inside. The transition between the large and small holes is made with a 45-degree chamfer. The outer shell (1) of the pipe is provided with a first dynamic pressure drain hole (13), a second dynamic pressure drain hole (14) and a static pressure hole (20).
3. The pitot tube structure for sub-zero environments according to claim 2, characterized in that, The first dynamic pressure drain hole (13) is located at the inlet of the outer shell (1) of the pipe body, close to the head of the core dynamic pressure pipe (3); The second dynamic pressure drain hole (14) is located at the middle end of the outer shell (1) of the pipe body.
4. The pitot tube structure for sub-zero environments according to claim 2, characterized in that, The static pressure hole (20) includes an upper static pressure hole and a lower static pressure hole; the upper and lower static pressure holes are aligned and installed. Three upper static pressure holes are provided and arranged symmetrically on the left and right at 15-degree intervals. Five static pressure holes are provided, arranged symmetrically on the left and right sides at 23-degree intervals; The static pressure hole (20) is installed at the rear end of the second dynamic pressure drain hole (14).
5. The pitot tube structure for sub-zero environments according to claim 1, characterized in that, The hydrodynamic tube assembly includes a core hydrodynamic tube (3) and an extension tube (4); The core dynamic pressure tube (3) is cylindrical, with a blind hole at the head and a water vapor barrier (17) in the middle; there is a straight hole after the water vapor barrier (17) and an internal thread at the end; The core dynamic pressure tube (3) is connected to the extension tube (4) via an internal thread; The core dynamic pressure tube (3) consists of, from front to back, a temperature sensor fixing position, a heating film fixing position, a heating film pad fixing position, a drainage limiting groove, a sensor wire harness through-wall hole, a sealing ring fixing groove, and a fixing screw hole; The extension tube (4) is cylindrical, with an external thread at the front end that connects to the core dynamic pressure tube (3), and two sealing ring fixing grooves at the end.
6. The pitot tube structure for sub-zero environments according to claim 5, characterized in that, The heating element in the heating system is a heating film (8); the control unit is integrated in the heating control box; The heating film pad fixing position adopts a four-equal distribution design, so that the heating film (8) is evenly distributed in the circumferential direction; The temperature sensor (9) is set at the temperature sensor fixing position and arranged adjacent to the heating film fixing position; The heating control box automatically adjusts the heating power based on the feedback signal from the temperature sensor (9), with a power adjustment range of 0-65W; The heating system also includes a heat-conducting cover (2) for wrapping the heating film (8), providing stable support, and transferring the heat of the heating film (8) to the outer shell of the tube (1).
7. The pitot tube structure for sub-zero environments according to claim 4, characterized in that, The first dynamic pressure drainage hole (13) and the second dynamic pressure drainage hole (14) together constitute a two-stage drainage system; The drainage limiting groove and drainage hole on the core dynamic pressure pipe (3) are arranged concentrically; The 45-degree chamfer transition of the stepped hole inside the head of the pipe shell (1) is used for water to flow to the drain hole; The drain hole is located at the lowest point of the bottom of the outer shell of the pipe (1), and the water flows to the drain hole under the action of gravity.
8. The pitot tube structure for sub-zero environments according to claim 1, characterized in that, The rear cover assembly includes the pitot tube rear cover (5); The airspeed tube rear cover (5) is designed with a cylindrical head chamfer, and the front and rear of the cylindrical surface are evenly distributed with the body fixing thread connection holes and the fixing shell thread holes; The airspeed tube rear cover (5) is provided with a cross groove, the middle dynamic pressure hole is 20mm deep, and the end dynamic pressure hole intersects with the middle dynamic pressure hole; The end dynamic pressure hole is threaded and has a sensor wiring harness through hole; the small hole of the static pressure hole is directly connected to the large hole of the end static pressure hole, and the end of the end static pressure hole is threaded.
9. The pitot tube structure for sub-zero environments according to claim 1, characterized in that, Pipeline connectors include dynamic pressure pagoda heads (6) and static pressure pagoda heads (7); Both the dynamic pressure pagoda head (6) and the static pressure pagoda head (7) have threads at the front end and through holes inside. Both have two stepped anti-reverse steps at the end to prevent the connecting pipe from falling off.
10. The pitot tube structure for sub-zero environments according to claim 9, characterized in that, Pipeline connectors also include connecting wires (12); The connecting wire (12) passes through the rear cover assembly to power the internal devices and transmit control signals.