Dustproof and waterproof high-precision pressure sensor

Abstract

The invention provides a dustproof and waterproof high-precision pressure sensor. The dustproof and waterproof high-precision pressure sensor comprises a mounting base and a pressure sensing hole assembly, the mounting base comprises a mounting surface and a boss, and the boss is arranged on the top surface of the mounting surface; a central through hole is formed in the center of the mounting base, and the pressure sensing hole assembly is arranged in the central through hole; a plurality of mounting columns are arranged on the mounting surface around the boss, rivets are mounted in the mounting columns to fix the mounting surface on the skin, so that the boss penetrates through a mounting hole in the aircraft skin, and the top surface of the boss and the aircraft skin are conformal in appearance; the height of the mounting column is adjusted according to the boss height and the aircraft skin thickness. The problems that the onboard installation step difference is easy to be out of tolerance, the machining tolerance of equipment such as the pressure sensor and the aircraft skin is too small, and machining is not easy are effectively solved, the pressure sensing precision of the pressure sensor is improved, and high practicability and economical efficiency are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of aircraft atmospheric data systems, and in particular relates to a dustproof and waterproof high-precision pressure sensor. Background Art

[0002] A pressure sensor is an atmospheric pressure sensor that is used to match the aircraft's atmospheric data system. It is used to measure the local pressure of an aircraft when it is flying in the air. It is generally installed symmetrically on the outside of the aircraft's skin, and its shape must be conformal to the local skin of the fuselage.

[0003] In order to improve the pressure sensing accuracy, the pressure sensor should be as flush as possible with the aircraft skin after installation, that is, the installation step difference should be as small as possible. The smaller the installation step difference, the smaller the pressure sensing error. Especially when the aircraft is designed for RVSM, the pressure sensing accuracy is required to be higher.

[0004] The existing pressure sensors are directly mounted on the aircraft skin. The installation step difference between a group of pressure sensors installed together and the aircraft skin is fixed and has been formed after the processing is completed, and cannot be adjusted. This requires extremely high processing accuracy for both the pressure sensor and the aircraft skin to meet the use requirements. If the installation step difference is unqualified, the pressure sensor needs to be replaced or scrapped, which is inconvenient and uneconomical.

[0005] In order to improve the accuracy of pressure sensing, the screws around the pressure sensor should be as flush as possible with the aircraft skin, without pits, protrusions, etc. Riveting the pressure sensor to the aircraft skin with rivets can effectively solve problems such as pits, but when the pressure sensor is damaged or the heating fails, the pressure sensor needs to be removed as a whole. The rivet removal process is cumbersome and difficult to carry out.

[0006] During use, pressure sensors often experience blockage of pressure pipes due to moisture or foreign matter entering the pressure pipes, posing certain risks to flight safety. Summary of the invention

[0007] Aiming at the situation where the pressure sensing accuracy is required to be high, the present invention provides a dustproof and waterproof high-precision pressure sensor.

[0008] The present invention provides a dustproof and waterproof high-precision pressure sensor, comprising: a mounting base and a pressure sensing hole assembly;

[0009] The mounting base comprises a mounting surface and a boss, wherein the boss is arranged on the top surface of the mounting surface;

[0010] A central through hole is arranged at the center of the mounting base, and the pressure sensing hole assembly is arranged in the central through hole;

[0011] A plurality of mounting columns are arranged around the boss on the mounting surface, and rivets are installed in the mounting columns to fix the mounting surface on the skin, so that the boss passes through the mounting hole on the aircraft skin, and the top surface shape of the boss conforms to the aircraft skin;

[0012] The height of the mounting column is adjusted according to the height of the boss and the thickness of the aircraft skin.

[0013] Optionally, it also includes: a peelable gasket;

[0014] The peelable gasket is arranged between the top surface of the mounting post and the aircraft skin.

[0015] Optionally, the pressure sensing hole assembly is fixedly connected to the bottom surface of the mounting surface by bolts.

[0016] Optionally, a sealing groove is provided on the bottom surface of the mounting surface, and a sealing ring between the pressure sensing hole assembly and the bottom surface of the mounting surface is provided in the sealing groove.

[0017] Optionally, the pressure sensing hole assembly includes: a pressure chamber and a take-over nozzle chamber, and the take-over nozzle chamber is arranged obliquely upward;

[0018] A baffle is arranged in the pressure chamber, with the front end of the baffle facing the air inlet, and a cylinder is arranged at the rear end of the baffle. Vent holes are arranged around the front end of the cylinder, and the rear end of the cylinder is clamped in the nozzle cavity. The gas passes through the air inlet, bypasses the baffle, and enters the cylinder and the nozzle cavity through the vent holes.

[0019] Optionally, the diameter of the baffle is smaller than the diameter of the pressure chamber and larger than the outer diameter of the cylinder.

[0020] Optionally, the pressure chamber is conical, with the end with a larger diameter facing the outside of the aircraft.

[0021] Optionally, a dustproof net is provided at the rear end of the pressure chamber.

[0022] The present invention provides a dustproof and waterproof high-precision pressure sensor, which effectively solves the problem that the step difference during installation on the aircraft is easy to exceed the tolerance, the processing tolerance of the pressure sensor and the aircraft skin and other equipment is too small, and it is difficult to process, thereby improving the pressure sensing accuracy of the pressure sensor and having high practicality and economy; effectively solves the problem that after the pressure sensor is riveted and installed, the pressure hole assembly needs to be disassembled as a whole when it fails, and the rivet removal process is cumbersome and difficult to perform, and at the same time improves the versatility of the pressure sensing assembly; effectively solves the problem of blockage of the pressure pipeline caused by water and foreign matter entering the pressure sensor pipeline, thereby improving the safety of the aircraft. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Schematic diagram of the structure of a high-precision pressure sensor for dust and water resistance Figure 1 ;

[0024] Figure 2Schematic diagram of the structure of a high-precision pressure sensor for dust and water resistance Figure 2 ;

[0025] Figure 3 Schematic diagram of the structure of a high-precision pressure sensor for dust and water resistance Figure 3 ;

[0026] Figure 4 Schematic diagram of the structure of a high-precision pressure sensor for dust and water resistance Figure 4 ;

[0027] Description of reference numerals:

[0028] 1- Install the base;

[0029] 2-pressure sensing hole assembly;

[0030] 3-Baffle;

[0031] 4- Dustproof net. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0033] The features and illustrative embodiments of various aspects of the present invention will be described in detail below. In the detailed description below, many specific details are proposed to provide a comprehensive understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by illustrating examples of the present invention. The present invention is by no means limited to any specific settings and methods proposed below, but covers any improvements, replacements and modifications of structures, methods, devices without departing from the spirit of the present invention. In the accompanying drawings and the following description, known structures and technologies are not shown to avoid unnecessary ambiguity in the present invention.

[0034] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other, and the embodiments can refer to and quote each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0035] The present invention is further described in detail below in conjunction with embodiments and drawings, but the embodiments of the present invention are not limited thereto.

[0036] like Figure 1-3 , the present invention provides a dustproof and waterproof high-precision pressure sensor, comprising: a mounting base 1 and a pressure sensing hole assembly 2;

[0037] The mounting base comprises a mounting surface and a boss, wherein the boss is arranged on the top surface of the mounting surface;

[0038] A central through hole is arranged at the center of the mounting base, and the pressure sensing hole assembly is arranged in the central through hole;

[0039] A plurality of mounting columns are arranged around the boss on the mounting surface, and rivets are installed in the mounting columns to fix the mounting surface on the skin, so that the boss passes through the mounting hole on the aircraft skin, and the top surface shape of the boss conforms to the aircraft skin;

[0040] The height of the mounting column is adjusted according to the height of the boss and the thickness of the aircraft skin.

[0041] Optionally, it also includes: a peelable gasket;

[0042] The peelable gasket is arranged between the top surface of the mounting post and the aircraft skin.

[0043] Optionally, the pressure sensing hole assembly is fixedly connected to the bottom surface of the mounting surface by bolts.

[0044] Optionally, a sealing groove is provided on the bottom surface of the mounting surface, and a sealing ring between the pressure sensing hole assembly and the bottom surface of the mounting surface is provided in the sealing groove.

[0045] Optionally, the pressure sensing hole assembly includes: a pressure chamber and a take-over nozzle chamber, and the take-over nozzle chamber is arranged obliquely upward;

[0046] A baffle 3 is arranged in the pressure chamber, with the front end of the baffle facing the air inlet, and a cylinder is arranged at the rear end of the baffle. Vents are arranged around the front end of the cylinder, and the rear end of the cylinder is clamped in the nozzle cavity. The gas passes through the air inlet, bypasses the baffle, and enters the cylinder and the nozzle cavity through the vents.

[0047] Optionally, the diameter of the baffle is smaller than the diameter of the pressure chamber and larger than the outer diameter of the cylinder.

[0048] Optionally, the pressure chamber is conical, with the end with a larger diameter facing the outside of the aircraft.

[0049] Optionally, a dustproof net 4 is provided at the rear end of the pressure chamber.

[0050] Exemplarily, in a specific embodiment, the present invention adopts the following measures in design:

[0051] a) Adjust the installation step:

[0052] 1) The pressure sensor is designed as a two-body structure, consisting of a mounting base and a pressure sensing hole assembly. The mounting base is designed in a "convex" shape, in which the upper boss is designed with a curved surface and conforms to the aircraft skin. The upper surface of the boss is flush with the aircraft skin, and the "step" formed here is the installation step.

[0053] 2) The second platform from top to bottom of the "convex"-shaped mounting base is the mounting surface of the mounting base. During installation, the top surface of the mounting surface fits the inner surface of the aircraft skin, and a certain number of mounting columns of a certain height are designed on the mounting surface. The height of the mounting column is determined by calculating the theoretical thickness of the aircraft skin thickness, the thickness of the mounting lining, the boss of the pressure sensor mounting base and other related equipment.

[0054] 3) When installing the pressure sensor on the aircraft, determine the height of the mounting column based on the actual thickness of the relevant equipment in 2), and ensure the final height of the mounting column by grinding or adding peelable gaskets so that the mounting column and the aircraft skin can fit perfectly, thereby ensuring that the installation step difference between the upper surface of the boss at the top of the mounting base and the aircraft skin meets the use requirements.

[0055] b) Improve component versatility:

[0056] The center of the pressure sensor is the pressure sensing hole assembly, which is a flat design, which is convenient for interchange between different models. The pressure sensing hole assembly can be designed with heating or without heating. The pressure sensing hole assembly is connected to the mounting base by screws, which is convenient for disassembly and assembly on the aircraft. It can be used universally between different models, which improves the versatility of the pressure sensing assembly and reduces the number of times the pressure sensor mounting base is disassembled and assembled.

[0057] c) Dust and water proof:

[0058] 1) Option 1: A baffle is designed in the pressure chamber of the pressure sensor, and four vents are designed at the rear end of the baffle. The gas is blocked by the baffle at the front end, and then enters the nozzle cavity from the vents at the rear end. Water and foreign matter are also blocked at the front end, effectively preventing water or foreign matter from entering the nozzle cavity at the rear end.

[0059] 2) Option 2: The front end of the pressure chamber is designed to be a cone, and the pressure chamber and the pressure hole below are installed at the lowest point of the pipeline. When water enters the pressure chamber, it is not easy to remain and will flow out of the pressure chamber along the cone. A dustproof net is designed at the rear end of the pressure chamber. When foreign matter enters the pressure chamber, it is blocked at the dustproof net and will not enter the nozzle cavity at the rear end.

[0060] 3) Option 1 and Option 2 can be used in combination.

[0061] The above is only a specific embodiment of the present invention, and the present invention is described in detail. The unexplained part is a conventional technology. However, the protection scope of the present invention is not limited to this. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. The protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A dustproof and waterproof high-precision pressure sensor, characterized in that: include: Install the base and pressure sensing hole assembly; The mounting base comprises a mounting surface and a boss, wherein the boss is arranged on the top surface of the mounting surface; A central through hole is arranged at the center of the mounting base, and the pressure sensing hole assembly is arranged in the central through hole; A plurality of mounting columns are arranged around the boss on the mounting surface, and rivets are installed in the mounting columns to fix the mounting surface on the skin, so that the boss passes through the mounting hole on the aircraft skin, and the top surface shape of the boss conforms to the aircraft skin; The height of the mounting column is adjusted according to the height of the boss and the thickness of the aircraft skin.

2. The dustproof and waterproof high-precision pressure sensor according to claim 1, characterized in that: Also includes: Peelable gasket; The peelable gasket is arranged between the top surface of the mounting post and the aircraft skin.

3. The dustproof and waterproof high-precision pressure sensor according to claim 1, characterized in that: The pressure sensing hole assembly is fixedly connected to the bottom surface of the mounting surface by bolts.

4. The dustproof and waterproof high-precision pressure sensor according to claim 3, characterized in that: A sealing groove is arranged on the bottom surface of the mounting surface, and a sealing ring between the pressure sensing hole assembly and the bottom surface of the mounting surface is arranged in the sealing groove.

5. The dustproof and waterproof high-precision pressure sensor according to claim 1, characterized in that: The pressure sensing hole assembly comprises: a pressure chamber and a take-over nozzle chamber, wherein the take-over nozzle chamber is arranged obliquely upward; A baffle is arranged in the pressure chamber, with the front end of the baffle facing the air inlet, and a cylinder is arranged at the rear end of the baffle. Vent holes are arranged around the front end of the cylinder, and the rear end of the cylinder is clamped in the nozzle cavity. The gas passes through the air inlet, bypasses the baffle, and enters the cylinder and the nozzle cavity through the vent holes.

6. The dustproof and waterproof high-precision pressure sensor according to claim 5, characterized in that: The diameter of the baffle is smaller than the diameter of the pressure chamber and larger than the outer diameter of the cylinder.

7. The dustproof and waterproof high-precision pressure sensor according to claim 1 or 5, characterized in that: The pressure chamber is conical, with the end with a larger diameter facing the outside of the aircraft.

8. The dustproof and waterproof high-precision pressure sensor according to claim 7, characterized in that: A dustproof net is arranged at the rear end of the pressure chamber.

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