Assembling and welding structure for atmospheric pressure sensor heating cable

Abstract

The utility model discloses an assembling and welding structure for an atmospheric pressure sensor heating cable, belongs to the technical field of atmospheric pressure sensors, and solves the problem that an existing atmospheric pressure sensor heating cable is inconvenient to assemble and weld. The device comprises a brazing filler metal auxiliary forming piece and a framework, and the brazing filler metal auxiliary forming piece is installed in a straight pipe section of the atmospheric pressure sensor in an attached mode. The framework is located in a supporting arm section of the atmospheric pressure sensor, one end of the framework is fixed to the brazing filler metal auxiliary forming part, a spiral wire structure is arranged on the framework, and heating cables are wound on the spiral wire structure and the brazing filler metal auxiliary forming part. The conical brazing filler metal auxiliary forming part is tightly attached to the inner wall of the straight pipe section, and the framework with the spiral wire structure penetrates through the supporting arm section, so that a heating cable can be conveniently and directly wound on the spiral wire structure and the brazing filler metal auxiliary forming part, and the heating cable in the atmospheric pressure sensor can be directly wound on the spiral wire structure and the brazing filler metal auxiliary forming part. In other words, integrated supporting and positioning are achieved in a complex airspeed tube cavity, installation is convenient, and deformation is not prone to occurring.

Description

Technical Field

[0001] This utility model relates to the field of atmospheric pressure sensor technology, and specifically to a welding structure for heating cables of atmospheric pressure sensors. Background Technology

[0002] Atmospheric pressure sensors, also known as pitot tubes, are important functional devices on aircraft. Their function is to transmit the sensed total and static air pressure to the atmospheric data system, which then calculates the aircraft's airspeed and participates in the aircraft's flight control.

[0003] At high altitudes, aircraft are susceptible to icing due to low temperatures, which can clog pressure measurement orifices and impair pressure readings. Icing on the pitot tube can lead to incorrect airspeed, pressure, and altitude readings, causing pilot or automatic flight control system malfunctions and potentially resulting in a crash. Therefore, the pitot tube needs a heating function to provide anti-icing and de-icing capabilities during flight. The pitot tube's heating function typically utilizes resistance heating generated by energized armored heating cables. To ensure controllable and reliable heating, the heating cables must be installed and welded to the inner wall of the pitot tube in a consistent, close-fitting layout. Because the pitot tube's interior is generally a long, narrow space, while the heating cables are typically flexible armored structures with a diameter of φ1 to φ1.5, the layout, installation, and welding of the heating cables inside the pitot tube are challenging. Therefore, this technology is one of the most crucial core technologies in pitot tube manufacturing.

[0004] The traditional heating-type airspeed tube assembly process consists of six steps: heating cable winding and forming, brazing filler metal pre-placement, heating cable assembly, demolding of the forming fixture, supplementary brazing filler metal pre-placement, and welding. Among these, winding and forming, assembly, and pre-placement of brazing filler metal are three independent processes in the pre-welding assembly stage. This heating cable assembly process has the following problems: 1. For the narrow inner wall structure of the airspeed tube, the formed armored heating cable can often only be assembled into the cavity manually. Without the support of tooling, the heating cable is prone to deformation and breakage, making it impossible to achieve consistency in the armored heating cable layout and electrical integrity. 2. Some methods using split forming fixtures for heating cable forming and assembly require demolding the forming fixture after the heating cable is assembled into the inner wall of the airspeed tube. However, this method is only suitable for straight airspeed tubes (facilitating demolding of split forming fixtures) and is not applicable to internally curved airspeed tubes. 3. For complex cavity and armored heating cable layouts, the narrow and confined space increases assembly difficulty, making it difficult to pre-position the brazing filler metal and affecting the final brazing quality. In summary, the heating cables of existing atmospheric pressure sensors are not convenient for assembly and welding. Utility Model Content

[0005] To address the aforementioned problems in the prior art, this utility model provides a welding structure for heating cables of atmospheric pressure sensors, solving the problem that existing atmospheric pressure sensor heating cables are inconvenient to weld.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A welding structure for heating cables of an atmospheric pressure sensor is provided, comprising: a brazing filler metal auxiliary forming part, which is a hollow conical structure and is fitted into the straight pipe section of the atmospheric pressure sensor; and a frame, which is located in the support arm section of the atmospheric pressure sensor, one end of which is fixed to the brazing filler metal auxiliary forming part, and a spiral wire structure is provided on the frame. Heating cables are wound on both the spiral wire structure and the brazing filler metal auxiliary forming part.

[0008] In this solution, the brazing filler auxiliary forming component is a dual-function auxiliary device integrating brazing filler and forming. It serves as both the brazing filler and the forming tooling, simultaneously achieving the purposes of forming the armored heating cable, assisting in assembly, and pre-positioning the brazing filler. After subsequent assembly, it requires no demolding or additional brazing filler and can proceed directly to welding. The conical brazing filler auxiliary forming component fits tightly against the inner wall of the straight pipe section, combined with a skeleton with a spiral wire structure penetrating the support arm section. This facilitates the direct winding of the heating cable onto the spiral wire structure and the brazing filler auxiliary forming component. Thus, the heating cable achieves integrated support and positioning within the atmospheric pressure sensor, i.e., within the complex air velocity cavity, making installation convenient and less prone to deformation.

[0009] Furthermore, the brazing filler metal auxiliary forming part is hollowed out or has multiple through holes, which can reduce the amount of brazing filler metal used.

[0010] Furthermore, the spiral wire structure is welded onto the skeleton to enhance the structural strength.

[0011] Furthermore, the large-diameter end of the brazing filler-assisted forming part is welded to the skeleton.

[0012] Furthermore, the diameter of the spiral wire structure is larger than the diameter of the heating cable. This setting of the spiral wire diameter can form grooves, which helps to constrain the position of the heating cable and facilitates the winding of the heating cable.

[0013] Furthermore, the spiral wire structure includes a first spiral segment and a second spiral segment. The second spiral segment is close to the brazing filler metal auxiliary forming part, and the pitch of the first spiral segment is greater than that of the second spiral segment. The second spiral segment is close to the straight tube section and has a smaller pitch, which can increase the cable density to enhance the heating capacity.

[0014] Furthermore, the skeleton is a solid brazing rod, suitable for airspeed tubes without internal air passages.

[0015] Furthermore, the frame is a brazing filler cylinder that fits inside the support arm section of the atmospheric pressure sensor, and is suitable for airspeed tubes with internal air passages.

[0016] Furthermore, the material of the brazing filler-assisted forming part is brazing filler metal.

[0017] Furthermore, the material of the spiral wire structure is a wire-like brazing filler metal or a metal wire.

[0018] This utility model discloses a welding structure for heating cables of atmospheric pressure sensors, the advantages of which are:

[0019] This invention uses a conical brazing filler metal auxiliary forming part to closely fit the inner wall of the straight pipe section, combined with a skeleton with a spiral wire structure that runs through the support arm section. This allows the heating cable to be directly wound on the spiral wire structure and the brazing filler metal auxiliary forming part. As a result, the heating cable achieves integrated support and positioning in the atmospheric pressure sensor, i.e. in the complex air velocity cavity, which is convenient for installation and not easily deformed. Attached Figure Description

[0020] Figure 1 Perspective view of the assembly structure installed inside the atmospheric sensor;

[0021] Figure 2 This is a structural diagram of the welding assembly;

[0022] Figure 3 A schematic diagram of the structure in which the heating cable is wound on the welding assembly;

[0023] Figure 4 Perspective view of the assembly structure installed inside the atmospheric sensor;

[0024] Figure 5 This is a structural diagram of the welding assembly;

[0025] The components include: 1. Brazing filler metal auxiliary forming parts; 2. Skeleton; 3. Spiral wire structure; 4. Heating cable; 5. Straight pipe section; 6. Support arm section. Detailed Implementation

[0026] The specific embodiments of this utility model are described below to enable those skilled in the art to understand this utility model. However, it should be understood that this utility model is not limited to the scope of the specific embodiments. For those skilled in the art, as long as various changes are within the spirit and scope of this utility model as defined and determined by the appended claims, these changes are obvious. All utility model creations utilizing the concept of this utility model are within the scope of protection.

[0027] This embodiment provides a welding structure for heating cables of atmospheric pressure sensors, which solves the problem that existing heating cables of atmospheric pressure sensors 4 are inconvenient to weld. It is shown in detail below.

[0028] refer to Figures 1-3 A welding structure for heating cables of atmospheric pressure sensors includes a brazing filler 1, a skeleton 2, and a spiral wire structure 3.

[0029] Specifically, the material of the brazing filler auxiliary forming part 1 is brazing filler metal, and it has a hollow conical structure. It is installed in the straight pipe section 5 of the atmospheric pressure sensor.

[0030] To reduce the amount of brazing filler metal used, the brazing filler metal auxiliary forming part 1 is hollowed out or has multiple through holes.

[0031] In this embodiment, the brazing auxiliary forming part 1 is a dual-function auxiliary device integrating brazing and forming. It is both brazing material and forming tooling, and simultaneously achieves the purpose of forming the armored heating cable 4, assisting in assembly and pre-placing brazing material. After subsequent assembly, it does not need to be demolded or supplemented with brazing material, and can directly enter the welding process.

[0032] The frame 2 is located in the support arm section 6 of the atmospheric pressure sensor, and one end of the frame 2 is welded to the large diameter end of the brazing filler 1.

[0033] The spiral wire structure 3 is welded onto the skeleton 2, and heating cables 4 are wound on both the spiral wire structure 3 and the brazing filler auxiliary forming part 1.

[0034] In this embodiment, the spiral wire structure 3 is made of filamentous brazing filler metal or metal wire. The diameter of the spiral wire structure 3 is larger than the diameter of the heating cable 4. This design allows the spiral wire structure 3 to form grooves, which fix the position of the heating cable 4 and provide support. Therefore, during the assembly of the heating cable 4, changes in the cable layout, deformation, and damage to the heating cable 4 can be avoided. Preferably, the diameter of the spiral wire structure 3 is d1, and the diameter of the heating cable 4 is d2, where d1 = d2 + 0.1, with units of mm.

[0035] As a further embodiment, the spiral wire structure 3 includes a first spiral segment and a second spiral segment. The second spiral segment is close to the brazing filler metal auxiliary forming part 1, and the pitch of the first spiral segment is greater than that of the second spiral segment. The second spiral segment is close to the straight tube section 5 and has a smaller pitch, which can increase the cable density to enhance the heating capacity.

[0036] As one embodiment of the present solution, refer to Figure 1 and Figure 2 To accommodate airspeed tubes without internal air passages, the frame 2 is a solid brazing rod. Specifically, when the spiral wire structure 3 is a high-temperature resistant metal wire and the frame 2 is a silver-based brazing rod, resistance welding and fusion welding can be used between the two. When the spiral wire structure 3 is a silver-based brazing wire and the frame 2 is a silver-based brazing rod, fusion welding can be used.

[0037] As another solution in this embodiment, refer to Figure 4 and Figure 5 In order to be suitable for airspeed tubes with internal air passages, the frame 2 is a brazing filler cylinder that fits into the support arm section 6 of the atmospheric pressure sensor.

[0038] In summary, the beneficial effects of this plan are as follows:

[0039] The conical brazing filler 1 fits tightly against the inner wall of the straight pipe section 5, and the skeleton 2 with the spiral wire structure 3 passes through the support arm section 6, so that the heating cable 4 can be directly wound on the spiral wire structure 3 and the brazing filler 1. Thus, the heating cable 4 is integrated and positioned in the atmospheric pressure sensor, that is, in the complex air velocity cavity, which is convenient for installation and not easy to deform.

[0040] Although the specific embodiments of the utility model have been described in detail with reference to the accompanying drawings, this should not be construed as limiting the scope of protection of this patent. Various modifications and variations that can be made by those skilled in the art without inventive effort within the scope described in the claims still fall within the scope of protection of this patent.

Claims

1. A welding structure for heating cables of atmospheric pressure sensors, characterized in that, include: The brazing auxiliary forming part (1) is a hollow cone structure and is fitted into the straight pipe section (5) of the atmospheric pressure sensor. The skeleton (2) is located in the support arm section (6) of the atmospheric pressure sensor. One end of the skeleton (2) is fixed on the brazing auxiliary forming part (1). The skeleton (2) is provided with a spiral wire structure (3). Heating cables (4) are wound on both the spiral wire structure (3) and the brazing auxiliary forming part (1).

2. The welding structure for heating cables of atmospheric pressure sensors according to claim 1, characterized in that, The brazing filler auxiliary forming part (1) is hollowed out or has multiple through holes.

3. The welding structure for heating cables of atmospheric pressure sensors according to claim 1, characterized in that, The spiral wire structure (3) is welded onto the skeleton (2).

4. The welding structure for heating cables of atmospheric pressure sensors according to claim 1, characterized in that, The large-diameter end of the brazing filler (1) is welded to the skeleton (2).

5. The welding structure for heating cables of atmospheric pressure sensors according to claim 1, characterized in that, The diameter of the spiral wire structure (3) is larger than the diameter of the heating cable (4).

6. The welding structure for heating cables of atmospheric pressure sensors according to claim 5, characterized in that, The spiral wire structure (3) includes a first spiral segment and a second spiral segment. The second spiral segment is close to the brazing filler metal auxiliary forming part (1), and the pitch of the first spiral segment is greater than that of the second spiral segment.

7. The welding structure for heating cables of atmospheric pressure sensors according to claim 1, characterized in that, The skeleton (2) is a solid brazing rod.

8. The welding structure for heating cables of atmospheric pressure sensors according to claim 1, characterized in that, The frame (2) is a brazing filler cylinder that fits inside the support arm section (6) of the atmospheric pressure sensor.

9. The welding structure for heating cables of atmospheric pressure sensors according to claim 1, characterized in that, The material of the brazing filler auxiliary forming part (1) is brazing filler metal.

10. The welding structure for heating cables of atmospheric pressure sensors according to claim 1, characterized in that, The material of the spiral wire structure (3) is a wire-like brazing filler metal or a metal wire.

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