Total static pressure and total temperature sensor

Abstract

The invention belongs to the airborne atmosphere data detection technology, and particularly relates to a total static pressure and total temperature sensor. The sensor is of a straight rod type, and the sensor senses the total pressure and the static pressure in the flying process by forming the pressure measuring hole in the pipe head; the retardation temperature is converted into a resistance signal through a temperature-sensitive element in the airflow retardation chamber, and then the retardation temperature, namely the total temperature, is calculated according to a resistance value. The number of extending type atmosphere data probes on an aircraft is reduced through multi-parameter comprehensive feeling and calculation, the overall stealth performance of an atmosphere data system can be improved through miniaturization design, reliability is improved, and the system is more suitable for the comprehensive and intelligent use requirements of a new generation of aircrafts.

Description

Technical Field

[0001] The invention belongs to airborne atmospheric data detection technology, and in particular relates to a total static pressure and total temperature sensor. Background Art

[0002] Traditional total static pressure and total temperature measurement equipment is measured by total static pressure sensor and total temperature sensor respectively. The total static pressure sensor is generally L-shaped or straight rod type, which can sense the total pressure and static pressure atmospheric parameters of the atmosphere at the equipment installation location when the aircraft is flying. After correction and solution, it outputs atmospheric parameters such as pressure altitude and Mach number to related equipment on the aircraft. The total temperature sensor is generally T-shaped structure, which can directly sense the total temperature of the atmosphere when the aircraft is flying. After correction and solution, it outputs atmospheric static temperature, true air speed and other parameters to related equipment on the aircraft. Traditional methods cannot achieve miniaturization, integration and low cost, and cannot meet the needs of low-cost and comprehensive use. Summary of the invention

[0003] The purpose of the present invention is to provide a new type of sensor that integrates total pressure, static pressure and total temperature, which can simultaneously measure information such as total pressure, static pressure and atmospheric temperature, and calculate atmospheric parameters such as pressure altitude, Mach number, and total atmospheric temperature. The sensor part senses the total pressure and static pressure during flight by opening a pressure measuring hole on the pipe head; the blocking temperature is converted into a resistance signal through a temperature-sensitive element in the airflow blocking chamber, and the blocking temperature, that is, the total temperature, is calculated based on the resistance value.

[0004] Technical Solution

[0005] A total static pressure and total temperature sensor, the total static pressure and total temperature sensor comprising: a pipe body 1, a total pressure cavity 2, a static pressure cavity 3, a gas-water separator 4, a total pressure hole 5, a static pressure hole 6, a blocking cavity 7, and a temperature sensitive element 8;

[0006] The tube body 1 is provided with two mutually airtight total pressure chambers 2 and static pressure chambers 3;

[0007] The gas-water separator 4 is arranged between the total pressure chamber 2 and the static pressure chamber 3 and separates the two chambers;

[0008] The front end of the tube body 1 is provided with a total pressure hole connected to the total pressure cavity, the total pressure hole includes a tapered section and a straight hole section, and the tapered section is a tapered hole with an opening angle of 60°;

[0009] The side wall of the tube body 1 is provided with a plurality of static pressure holes 6 connected to the static pressure holes;

[0010] The rear end of the tube body is provided with a blocking cavity 7, which is sleeved on the outside of the tube body, and a wire groove is opened on the side wall of the tube body. The temperature sensitive element 8 is bonded in the wire groove and led out from the rear of the wire groove through a connecting wire;

[0011] The front ends of the total pressure chamber conduit and the static pressure chamber conduit are respectively connected to the gas-water separator and the static pressure chamber, and the rear ends are connected to the resolver.

[0012] Furthermore, the number of static pressure holes is six, of which two are symmetrically distributed 180° above and below the vertical direction, and two of the static pressure holes are symmetrically distributed about the static pressure holes above the vertical direction, with an angle of 60°±1°; the remaining two static pressure holes are symmetrically distributed about the static pressure holes below the vertical direction, with an angle of 75°±1°, to ensure that the static pressure error coefficient meets the requirements.

[0013] Furthermore, the side wall of the tube body is provided with a leaking hole in the radial direction, and the leaking hole is arranged in the total pressure chamber 2, and the leaking hole is directly opposite to the waist-shaped hole of the gas-water separator 4, so that the water retained in the front total pressure chamber can be discharged in time.

[0014] Furthermore, the side wall of the blocking chamber 7 is provided with an exhaust hole, and the temperature sensitive element 8 is arranged at the front end of the exhaust hole with a minimum spacing of 5 mm, and the airflow and moisture entering the blocking chamber are discharged from the exhaust hole.

[0015] Furthermore, the center line of the total pressure hole 8 deviates from the center line of the tube body 1 by a distance of 4 mm±0.5 mm, thereby ensuring the accuracy of the total pressure sensing.

[0016] Furthermore, the axial distance between the front end faces of the static pressure hole and the total pressure hole is 50 mm, which ensures the accuracy of the total static pressure perception.

[0017] Furthermore, a compensating surface is provided on the outer surface of the tube body, which starts from the front end face of the total pressure hole and ends 20 mm behind the static pressure hole; the compensating surface is an arc surface, and the compensating surface is represented by tabular data to ensure that the static pressure source position error meets the requirements.

[0018] Furthermore, the blocking cavity is a cylinder, and the distance between the inner wall of the blocking cavity and the outer wall of the tube body is 7mm. The airflow in the blocking cavity is initially decelerated, and the airflow is completely blocked at the temperature-sensitive element. At this time, the blocking temperature is sensed by the temperature-sensitive element, and the solver calculates the blocking temperature, that is, the total temperature, based on the output resistance value.

[0019] Furthermore, the axial distance between the blocking cavity and the static pressure hole is not less than 58 mm to avoid the influence on the static pressure perception as much as possible and ensure the accuracy of the measurement.

[0020] The technical effect of the present invention is to provide a total static pressure and total temperature sensor, the sensor head is designed with a tube body 1, a total pressure hole 5 and a static pressure hole 6 and a total temperature blocking cavity 7 suitable for the local flow field at the sensor installation position, and the atmospheric parameters such as pressure altitude, Mach number, and total atmospheric temperature are calculated by sensing information such as total pressure, static pressure, and atmospheric temperature. The present invention has the advantages of high integration, high measurement accuracy, miniaturization, simple manufacturing process, good aerodynamic consistency, high qualified rate, and short manufacturing cycle, and is more suitable for the integrated, intelligent, and low-cost use requirements of aircraft. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1It is a schematic diagram of the structure of the total static pressure and total temperature sensor of the present invention.

[0022] Figure 2 It is a schematic diagram of the compensation surface. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0024] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0025] In addition, the terms "installed", "set", "provided with", "connected", "connected", and "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0026] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0027] See also Figure 1The total static pressure and total temperature sensor of the present invention is a straight rod structure as a whole: it is composed of a pipe body 1, a total pressure chamber 2, a static pressure chamber 3, a gas-water separator 4, a total pressure hole 5, a static pressure hole 6, a blocking chamber 7, and a temperature-sensitive element 8; two total pressure chambers 2 and static pressure chambers 3, which are respectively airtight to each other, are arranged in the pipe body 1; the gas-water separator 4 is arranged between the total pressure chamber 2 and the static pressure chamber 3 and separates the two chambers; a total pressure hole is arranged at the front end of the pipe body 1 to connect the total pressure chamber, and the total pressure hole includes a tapered section and a straight hole section, and the tapered section is a tapered hole with an opening angle of 60°; a plurality of static pressure holes 6 are arranged on the side wall of the pipe body 1 to connect with the static pressure hole; a blocking chamber 7 is arranged at the rear end of the pipe body, and the blocking chamber is sleeved on the outside of the pipe body, and a wire groove is opened on the side wall of the pipe body, and the temperature-sensitive element 8 is bonded in the wire groove and led out from the rear of the wire groove through a connecting wire; the front ends of the total pressure chamber conduit and the static pressure chamber conduit are respectively connected to the gas-water separator and the static pressure chamber, and the rear ends are connected to the resolver.

[0028] There are six static pressure holes, two of which are symmetrically distributed 180° above and below the vertical direction, and two of which are symmetrically distributed about the static pressure hole above the vertical direction, with an angle of 60°±1°; the remaining two static pressure holes are symmetrically distributed about the static pressure hole below the vertical direction, with an angle of 75°±1°. The number and angle of the static pressure holes 6 are obtained by aerodynamic simulation based on the static pressure source position error at the installation position of the total static pressure and total temperature sensor on the aircraft to ensure the static pressure sensing accuracy.

[0029] The side wall of the tube body is radially provided with a water leakage hole, which is arranged in the total pressure chamber 2 and faces the waist-shaped hole of the gas-water separator 4, so that the water retained in the front total pressure chamber can be discharged in time.

[0030] The side wall of the blocking chamber 7 is provided with an exhaust hole, and the temperature sensitive element 8 is arranged at the front end of the exhaust hole with a minimum spacing of 5 mm. The airflow and moisture entering the blocking chamber are discharged from the exhaust hole.

[0031] The center line of the total pressure hole 8 deviates from the center line of the tube body 1 by 4 mm±0.5 mm, thereby ensuring the accuracy of the total pressure sensing.

[0032] The axial distance between the static pressure hole and the front end surface of the total pressure hole is 50 mm, which ensures the accuracy of the total static pressure perception.

[0033] The outer surface of the tube body is provided with a compensation surface, which starts from the front end surface of the total pressure hole and ends 20 mm behind the static pressure hole; the compensation surface is an arc surface, and the compensation surface is represented by tabular data to ensure that the position error of the static pressure source meets the requirements. The surface is processed by a CNC lathe to ensure its reliability and pressure measurement consistency.

[0034] The compensation profile parameters are as follows:

[0035] Step length x Diameter Diameter tolerance △l 0 9.9 ±0.02 5 10.81 ±0.02 10 11.45 ±0.02 15 11.85 ±0.02 20 12 ±0.02 30 12 ±0.02 40 12 ±0.02 50 12 ±0.02 60 12 ±0.02 70 12 ±0.02

[0036] The axis of the tube is taken as the X-axis, and the origin is the intersection of the front end surface of the total pressure hole and the axis. Figure 2 The right direction of the middle level is the positive direction;

[0037] x represents the distance between a point on the axis of the tube body and the front end face of the total pressure hole; l represents the diameter of the point, and △l represents that the diameter tolerance of the point is △l.

[0038] Draw circles with the data of the above points, and then fit all the circles to obtain the compensation surface.

[0039] The blocking chamber is a cylinder, and the distance between the inner wall of the blocking chamber and the outer wall of the tube body is 7mm. The airflow in the blocking chamber is initially decelerated, and the airflow is completely blocked at the temperature-sensitive element. At this time, the blocking temperature is sensed by the temperature-sensitive element, and the solver calculates the blocking temperature, that is, the total temperature, according to the output resistance value.

[0040] The axial distance between the blocking cavity and the static pressure hole is not less than 58 mm, so as to avoid the influence on the static pressure perception as much as possible and ensure the accuracy of the measurement.

[0041] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A total static pressure and total temperature sensor, characterized in that: The total static pressure and total temperature sensor comprises: a pipe body (1), a total pressure chamber (2), a static pressure chamber (3), a gas-water separator (4), a total pressure hole (5), a static pressure hole (6), a blocking chamber (7), and a temperature sensitive element (8); The tube body (1) is provided with two mutually airtight total pressure chambers (2) and a static pressure chamber (3); The gas-water separator (4) is arranged between the total pressure chamber (2) and the static pressure chamber (3) to separate the two chambers; The front end of the tube body (1) is provided with a total pressure hole connected to the total pressure cavity, the total pressure hole comprises a tapered section and a straight hole section, the tapered section is a tapered hole with an opening angle of 60°; The side wall of the tube body (1) is provided with a plurality of static pressure holes (6) connected to the static pressure holes; The rear end of the tube body is provided with a blocking cavity (7), which is sleeved on the outside of the tube body. The side wall of the tube body is provided with a wire groove, and the temperature sensitive element (8) is bonded in the wire groove and led out from the rear of the wire groove through a connecting wire. The front ends of the total pressure chamber conduit and the static pressure chamber conduit are respectively connected to the gas-water separator and the static pressure chamber, and the rear ends are connected to the resolver.

2. A total static pressure and total temperature sensor according to claim 1, characterized in that: There are six static pressure holes, two of which are symmetrically distributed 180° above and below the vertical direction, two of which are symmetrically distributed about the static pressure hole above the vertical direction, with an angle of 60°±1°; the remaining two static pressure holes are symmetrically distributed about the static pressure hole below the vertical direction, with an angle of 75°±1°.

3. The total static pressure and total temperature sensor according to claim 1, characterized in that: The side wall of the tube body is provided with a water leakage hole in the radial direction. The water leakage hole is arranged in the total pressure chamber (2), and the water leakage hole is directly opposite to the waist-shaped hole of the gas-water separator (4).

4. The total static pressure and total temperature sensor according to claim 1, characterized in that: The side wall of the blocking chamber (7) is provided with an exhaust hole, and the temperature sensitive element (8) is arranged at the front end of the exhaust hole, with a minimum spacing of 5 mm.

5. The total static pressure and total temperature sensor according to claim 1, characterized in that: The center line of the total pressure hole (8) deviates from the center line of the tube body (1) by a distance of 4 mm ± 0.5 mm.

6. A total static pressure and total temperature sensor according to claim 1, characterized in that: The axial distance between the static pressure hole and the front end surface of the total pressure hole is 50mm.

7. A total static pressure and total temperature sensor according to claim 6, characterized in that: A compensating surface is provided on the outer surface of the tube body, which starts from the front end face of the total pressure hole and ends 20mm behind the static pressure hole; the compensating surface is an arc surface.

8. A total static pressure and total temperature sensor according to claim 7, characterized in that: The compensation profile is characterized by tabular data.

9. The total static pressure and total temperature sensor according to claim 1, characterized in that: The blocking cavity is a cylinder, and the distance between the inner wall of the blocking cavity and the outer wall of the tube body is 7 mm.

10. A total static pressure and total temperature sensor according to claim 9, characterized in that: The axial distance between the blocking cavity and the static pressure hole shall not be less than 58mm.

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