Five-hole probe type airspeed tube

Abstract

The invention discloses a five-hole probe type airspeed tube which is characterized in that exhaust holes are formed in the side wall of a middle tube, one end of a head connector is a hemispherical part, the other end of the head connector is connected with the head end of the middle tube, a first through hole is formed in the vertex of the hemispherical part, and four second through holes are evenly distributed in the hemispherical part around the first through hole; the tail connector is connected with the tail section of the middle pipe, the tail connector and the head connector block the two ends of the middle pipe respectively to form a cavity structure, the first connecting pipes are axially arranged in the middle pipe in a penetrating mode, the head ends of the five first connecting pipes are connected with the first through hole and the second through hole respectively, and the tail ends of the five first connecting pipes penetrate through the tail connector to be exposed. According to the five-hole probe type airspeed tube, the first through hole and the second through holes distributed around the first through hole are matched to monitor airflow, the accurate actual airflow value is calculated through the airflow at different angles, and it is guaranteed that the result is accurate. Meanwhile, the cavity structure communicates with the outside through the exhaust hole, the second connecting pipe monitors internal pressure to adapt to various calculation methods, and a static pressure reference value is provided.

Description

Technical Field

[0001] The invention belongs to the technical field of aerospace flow field measurement, and more specifically, relates to a five-hole probe type pitot tube. Background Art

[0002] Traditional pitot tubes mostly adopt a single-hole or double-hole design, with limited measurement accuracy and functionality, which makes it difficult to meet the needs of modern aerospace, automotive design and other fields for comprehensive and accurate measurement of airflow parameters. In addition, the stability and durability of traditional pitot tubes in harsh environments are also problematic, limiting their scope of application. Therefore, developing a pitot tube with high precision, versatility and suitability for a variety of harsh environments has become an urgent problem to be solved. Summary of the invention

[0003] The purpose of the present invention is to provide a five-hole probe pitot tube in view of the deficiencies in the prior art, so as to solve the problem that most of the existing traditional pitot tubes adopt a single-hole or double-hole design and have limited measurement accuracy and functionality.

[0004] In order to achieve the above object, the present invention provides a five-hole probe type pitot tube, comprising:

[0005] A middle tube, wherein a side wall of the middle tube is provided with an exhaust hole;

[0006] A head joint, one end of which is a hemispherical portion, the other end of which is connected to the head end of the middle tube, a first through hole is arranged at the vertex of the hemispherical portion, and four second through holes are evenly distributed around the first through hole in the hemispherical portion;

[0007] A tail joint, which is arranged at the tail section of the middle tube, and the tail joint and the head joint respectively block the two ends of the middle tube to form a cavity structure;

[0008] Five first connecting tubes, wherein the first connecting tubes are axially arranged in the middle tube, the head ends of the five first connecting tubes are respectively connected to the first through hole and the second through hole, and the tail ends of the five first connecting tubes pass through the tail joint to be exposed;

[0009] A second connecting pipe, the head end of which passes through the tail joint and is connected to the cavity structure;

[0010] The tail ends of the first connecting tube and the second connecting tube are used to connect to the computing module, the first through hole is used to monitor the total pressure, the second through hole is used to monitor the airflow direction, and the second connecting tube is used to monitor the internal pressure of the cavity structure.

[0011] Optionally, a heating module is provided in the middle tube, and a connecting line of the heating module passes through the tail joint and is exposed.

[0012] Optionally, the head joint is mushroom-shaped, and the other end of the head joint is plugged into the middle tube.

[0013] Optionally, the diameter of the hemispherical portion is the same as the outer diameter of the middle tube.

[0014] Optionally, the tail joint includes a column, a tapered cone sleeve is provided at one end of the column, the tail section of the middle tube is inserted into the cone sleeve, and a countersunk hole is provided at the other end of the column, and the tail ends of the first connecting tube and the second connecting tube are arranged in the countersunk hole.

[0015] Optionally, the heating module comprises a heating wire, and the heating wire is spirally arranged on the inner wall of the middle tube.

[0016] Optionally, the axis of the second through hole passes through the center of the hemispherical portion.

[0017] Optionally, an included angle between the second through hole and the first through hole is 45 degrees.

[0018] Optionally, the exhaust holes are distributed in multiple circles around the circumference.

[0019] Optionally, the heating module and the first connecting pipe are spaced apart.

[0020] The present invention provides a five-hole probe type pitot tube, which has the following beneficial effects:

[0021] The five-hole probe pitot tube monitors the airflow through a first through hole and a plurality of second through holes distributed around the first through hole, and calculates the precise actual airflow value through the airflow at different angles to ensure the accuracy of the result. At the same time, the cavity structure is connected to the outside through the exhaust hole, and the second connecting pipe monitors the internal pressure to adapt to various calculation methods and provide a static pressure reference value.

[0022] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, wherein like reference numerals generally represent like components throughout the exemplary embodiments of the present invention.

[0024] Figure 1 A front view of a five-hole probe type pitot tube according to an embodiment of the present invention is shown.

[0025] Figure 2 A schematic structural diagram of a rotating mechanism of a five-hole probe type pitot tube according to an embodiment of the present invention is shown.

[0026] Figure 3 A left side view of a five-hole probe pitot tube according to one embodiment of the present invention is shown.

[0027] Figure 4 A right side view of a five-hole probe pitot tube according to one embodiment of the present invention is shown.

[0028] Description of reference numerals:

[0029] 1. Middle tube; 2. Head joint; 3. Tail joint; 4. First connecting tube; 5. Second connecting tube; 6. Heating module. DETAILED DESCRIPTION

[0030] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0031] like Figure 1-4 As shown, a five-hole probe type pitot tube comprises:

[0032] A middle tube 1, the side wall of which is provided with an exhaust hole;

[0033] A head joint 2, one end of which is a hemispherical portion, the other end of which is connected to the head end of the middle tube 1, a first through hole is arranged at the vertex of the hemispherical portion, and four second through holes are evenly distributed around the first through hole on the hemispherical portion;

[0034] The tail joint 3 is arranged at the tail section of the middle tube 1, and the tail joint 3 and the head joint 2 respectively block the two ends of the middle tube 1 to form a cavity structure;

[0035] Five first connecting tubes 4, the first connecting tubes 4 are axially arranged in the middle tube 1, the head ends of the five first connecting tubes 4 are respectively connected to the first through hole and the second through hole, and the tail ends of the five first connecting tubes 4 pass through the tail joint 3 to be exposed;

[0036] A second connecting pipe 5, the head end of which passes through the tail joint 3 and is connected to the cavity structure;

[0037] The tail ends of the first connecting tube 4 and the second connecting tube 5 are used to connect to the computing module, the first through hole is used to monitor the total pressure, the second through hole is used to monitor the airflow direction, and the second connecting tube 5 is used to monitor the internal pressure of the cavity structure.

[0038] Specifically, the airflow is monitored by a first through hole and a plurality of second through holes distributed around the first through hole, and the precise actual airflow value is calculated through the airflow at different angles to ensure the accuracy of the result. At the same time, the cavity structure is connected to the outside through the exhaust hole, and the second connecting pipe 5 monitors the internal pressure to adapt to various calculation methods and provide a static pressure reference value.

[0039] Furthermore, the probe of the computing module is made of high-strength, corrosion-resistant alloy material to ensure its stability and durability in harsh environments, and the first connecting pipe 4 and the second connecting pipe 5 are connected to the probe through a corrosion-resistant air pipe. The four second through holes ensure the monitoring of the up, down, left, and right airflow relative to the windward direction.

[0040] In this embodiment, a heating module 6 is disposed in the middle tube 1 , and a connecting line of the heating module 6 passes through the tail joint 3 and is exposed outside.

[0041] Specifically, the cavity structure is heated by the heating module 6 to prevent frost condensation inside from affecting detection.

[0042] In this embodiment, the head joint 2 is mushroom-shaped, and the other end of the head joint 2 is plugged into the middle tube 1 .

[0043] Specifically, the plug-in structure ensures that the head joint 2 and the middle tube 1 are connected stably, and in order to ensure the airtightness of the connection, a firm seal can be achieved by welding.

[0044] In this embodiment, the diameter of the hemispherical portion is the same as the outer diameter of the middle tube 1 .

[0045] Specifically, adapt to airflow to reduce wind resistance.

[0046] In this embodiment, the tail joint 3 includes a column, a tapered cone sleeve is provided at one end of the column, the tail section of the middle tube 1 is inserted into the cone sleeve, a countersunk hole is provided at the other end of the column, and the tail ends of the first connecting tube 4 and the second connecting tube 5 are arranged in the countersunk hole.

[0047] Specifically, the cone sleeve ensures the connection stability and airtightness, while the cone adapts to the change of airflow. The first connecting pipe 4 and the second connecting pipe 5 are connected to the extension pipe in the counterbore and contact with the computer to protect the safety of the connection.

[0048] In this embodiment, the heating module 6 includes a heating wire, and the heating wire is spirally arranged on the inner wall of the middle tube 1 .

[0049] Specifically, the cavity structure is heated by a heating wire.

[0050] In this embodiment, the axis of the second through hole passes through the center of the hemispherical portion.

[0051] In this embodiment, the included angle between the second through hole and the first through hole is 45 degrees.

[0052] Specifically, accurate detection of the airflow direction is ensured by reasonably setting the position of the second through hole.

[0053] In this embodiment, the exhaust holes are distributed in multiple circles around the circumference.

[0054] Specifically, multiple circles of exhaust holes are used to drain water and sense static pressure, thereby achieving correct drainage and exhaust effects.

[0055] In this embodiment, the heating module 6 and the first connecting pipe 4 are spaced apart.

[0056] Specifically, the heating module 6 is prevented from interfering with the airflow transmission of the first connecting pipe 4 and / or the second connecting pipe 5 .

[0057] In this embodiment, a five-hole probe type pitot tube is used, taking the use of a drone as an example.

[0058] One end of the head joint 2 is a hemispherical portion, and the other end is a columnar shoulder. The head joint 2 is positioned with the middle tube 1 through the shoulder and then fixed by laser welding.

[0059] A first through hole and four second through holes are arranged in the hemispherical part, and five first connecting pipes 4 are embedded in the head joint 2 and connected to the through holes respectively, and are sealed and fixed by brazing.

[0060] A heating wire is wound inside the middle tube 1, and a drainage hole is designed in the front half. The tail is embedded in the tail joint 3 and is sealed and fixed by full-circle laser welding.

[0061] The tail joint 3 has the second connecting pipe 5, the first connecting pipe 4 and the installation holes of the heating wire tail inside, and after the installation is completed, it needs to be laser sealed and welded. There are fixed holes around the tail joint 3 for installing the pitot tube.

[0062] One end of the air sleeve is inserted into the first connecting tube 4 and the second connecting tube 5 and sealed with a sealing glue, and the other end of the air tube is connected to a computer for information solution.

[0063] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A five-hole probe type airspeed control tube, which is characterized by: Book A middle tube, wherein a side wall of the middle tube is provided with an exhaust hole; A head joint, one end of which is a hemispherical portion, the other end of which is connected to the head end of the middle tube, a first through hole is arranged at the vertex of the hemispherical portion, and four second through holes are evenly distributed around the first through hole in the hemispherical portion; A tail joint, which is arranged at the tail section of the middle tube, and the tail joint and the head joint respectively block the two ends of the middle tube to form a cavity structure; Five first connecting tubes, wherein the first connecting tubes are axially arranged in the middle tube, the head ends of the five first connecting tubes are respectively connected to the first through hole and the second through hole, and the tail ends of the five first connecting tubes pass through the tail joint to be exposed; A second connecting pipe, the head end of which passes through the tail joint and is connected to the cavity structure; The tail ends of the first connecting tube and the second connecting tube are used to connect to the computing module, the first through hole is used to monitor the total pressure, the second through hole is used to monitor the airflow direction, and the second connecting tube is used to monitor the internal pressure of the cavity structure.

2. The five-hole probe type pitot tube according to claim 1, characterized in that: A heating module is arranged in the middle tube, and a connecting line of the heating module passes through the tail joint and is exposed.

3. The five-hole probe type pitot tube according to claim 1, characterized in that: The head joint is mushroom-shaped, and the other end of the head joint is plugged into the middle tube.

4. The five-hole probe type pitot tube according to claim 3, characterized in that: The diameter of the hemispherical portion is the same as the outer diameter of the middle tube.

5. The five-hole probe type pitot tube according to claim 1, characterized in that: The tail joint includes a column, one end of which is provided with a tapered cone sleeve, the tail section of the middle tube is inserted into the cone sleeve, the other end of the column is provided with a countersunk hole, and the tail ends of the first connecting pipe and the second connecting pipe are arranged in the countersunk hole.

6. The five-hole probe type pitot tube according to claim 5, characterized in that: The heating module comprises a heating wire, and the heating wire is spirally arranged on the inner wall of the middle tube.

7. The five-hole probe type pitot tube according to claim 1, characterized in that: The axis of the second through hole passes through the center of the hemispherical portion.

8. The five-hole probe type pitot tube according to claim 7, characterized in that: The included angle between the second through hole and the first through hole is 45 degrees.

9. The five-hole probe type pitot tube according to claim 1, characterized in that: The exhaust holes are distributed in multiple circles around the circumference.

10. The five-hole probe type pitot tube according to claim 1, characterized in that: The heating module and the first connecting pipe are spaced apart.

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