A total pressure and total temperature sensor

Abstract

The present application belongs to airborne atmospheric data detection technology, and particularly relates to a total static pressure and total temperature sensor. The present application is a straight rod type, and the sensor senses the total pressure and static pressure during flight by opening a pressure measuring hole on the pipe head; the temperature sensitive element in the airflow resistance chamber converts the resistance temperature into a resistance signal, and then the resistance value is used to calculate the resistance temperature, i.e. the total temperature. The comprehensive sensing and calculation of multiple parameters reduces the number of the extended atmospheric data probes on the airplane, the miniaturized design can improve the overall stealth performance of the atmospheric data system, improve the reliability, and is more suitable for the integrated and intelligent use requirements of the new generation of airplanes.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of airborne atmospheric data detection, and particularly relates to a total static pressure and total temperature sensor. BACKGROUND

[0002] The conventional total static pressure and total temperature measuring device respectively measures the total static pressure sensor and the total temperature sensor. The total static pressure sensor is generally L-shaped or straight rod-shaped, can sense the total pressure and static pressure atmospheric parameters of the atmosphere at the installation position of the device during the flight of the aircraft, and outputs the atmospheric parameters such as air pressure height and Mach number to the related devices on the aircraft after correction and calculation. The total temperature sensor is generally T-shaped structure, can directly sense the total temperature of the atmosphere during the flight of the aircraft, and outputs the parameters such as atmospheric static temperature and true airspeed to the related devices on the aircraft after correction and calculation. The conventional method cannot achieve miniaturization, integration and low cost, and cannot adapt to the low-cost and comprehensive use requirements. SUMMARY

[0003] The purpose of the present application is to provide a new sensor integrating total pressure, static pressure and total temperature, which can simultaneously measure total pressure, static pressure and atmospheric temperature information, and calculate atmospheric parameters such as air pressure height, Mach number and atmospheric total temperature. The sensor part senses the total pressure and static pressure during the flight by opening a pressure measuring hole on the pipe head; the temperature sensitive element in the airflow resistance chamber converts the resistance temperature into a resistance signal, and then calculates the resistance temperature, i.e. the total temperature, according to the resistance value.

[0004] TECHNICAL SCHEME

[0005] A total static pressure and total temperature sensor, comprising: a pipe body 1, a total pressure cavity 2, a static pressure cavity 3, an air-water separator 4, a total pressure hole 5, a static pressure hole 6, a resistance cavity 7, and a temperature sensitive element 8.

[0006] The pipe body 1 is provided with two total pressure cavities 2 and static pressure cavities 3 which are air-tight to each other;

[0007] The air-water separator 4 is arranged between the total pressure cavity 2 and the static pressure cavity 3 and separates the two cavities;

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

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

[0010] The pipe body 1 is provided with a resistance cavity 7 at the rear end, the resistance cavity is sleeved outside the pipe body, the side wall of the pipe body is provided with a wire slot, the temperature sensitive element 8 is bonded in the wire slot and led out from the rear of the wire slot through a connecting wire;

[0011] The front ends of the total pressure cavity conduit and the static pressure cavity conduit are respectively connected to the air-water separator and the static pressure cavity, and the rear ends are connected to a calculator.

[0012] Further, the number of static pressure holes is six, two of which are symmetrically distributed 180 degrees above and below the vertical direction, two of which are symmetrically distributed about the static pressure hole above the vertical direction, and the included angle is 60°±1°; the remaining two are symmetrically distributed about the static pressure hole below the vertical direction, and the included angle is 75°±1°, which ensures that the static pressure error coefficient meets the requirements.

[0013] Further, the pipe body side wall is provided with a water leakage hole in the radial direction, the water leakage hole is arranged in the total pressure cavity 2, and the water leakage hole is opposite to the waist-shaped hole of the air-water separator 4, so that the water remaining in the front end total pressure cavity is discharged in time.

[0014] Further, the side wall of the retardation cavity 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 spacing of at least 5mm, and the airflow and moisture entering the retardation chamber are discharged from the exhaust hole.

[0015] Further, the center line of the total pressure hole 8 deviates from the center line of the pipe body 1 by 4mm±0.5mm, which ensures the accuracy of total pressure sensing.

[0016] Further, the axial distance between the front end face of the static pressure hole and the total pressure hole is 50mm, which ensures the accuracy of total static pressure sensing.

[0017] Further, the outer surface of the pipe body is provided with a compensation profile, the compensation profile starts from the front end face of the total pressure hole and ends at a position 20mm behind the static pressure hole; the compensation profile is an arc surface, and the compensation profile is characterized by table data, which ensures that the position error of the static pressure source meets the requirements.

[0018] Further, the retardation cavity is a cylinder, and the distance between the inner wall of the retardation cavity and the outer wall of the pipe body is 7mm, so that the airflow is preliminarily decelerated in the retardation cavity, 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 according to the output resistance value, that is, the total temperature.

[0019] Further, the axial distance between the retardation cavity and the static pressure hole is not less than 58mm, which can avoid the influence on the static pressure sensing as much as possible and ensure the accuracy of measurement.

[0020] The technical effect of the present application is to provide a total static pressure total temperature sensor, the head part of the sensor is designed to be suitable for the pipe body 1, the total pressure hole 5 and the static pressure hole 6 and the total temperature retardation cavity 7 at the installation position of the sensor, and the information of total pressure, static pressure and atmospheric temperature is sensed, and the atmospheric parameters such as air pressure height, Mach number and atmospheric total temperature are calculated. The present application has the advantages of high degree of integration, high measurement accuracy, small size, simple manufacturing process, good aerodynamic consistency, high qualified rate and short manufacturing cycle, and is more suitable for the integration, intelligentization and low-cost use requirements of aircraft. BRIEF DESCRIPTION OF DRAWINGS

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

[0022] Figure 2 It is a compensation profile schematic diagram. DETAILED DESCRIPTION

[0023] In order to enable persons skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by persons skilled in the art without creative work should belong to 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", "transverse", "longitudinal", and the like indicate the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not intended 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 "mount", "set", "provided with", "connect", "connected", "sleeved" should be broadly understood. For example, it can be fixedly connected, detachably connected, or integrally constructed; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication between two devices, elements or components. For persons skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

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

[0027] Please refer to Figure 1The total static pressure and total temperature sensor is a straight rod type structure, which is composed of 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 retardation cavity 7 and a temperature sensitive element 8.

[0028] The number of the static pressure holes is six, two of which are symmetrically distributed above and below in the vertical direction, two of which are symmetrically distributed about the static pressure hole above the vertical direction with an included angle of 60°±1°, and the remaining two of which are symmetrically distributed about the static pressure hole below the vertical direction with an included angle of 75°±1°.

[0029] The pipe body side wall is provided with a water leakage hole in the radial direction, which is arranged in the total pressure cavity 2 and opposite to the waist-shaped hole of the gas-water separator 4, so as to timely drain the water retained in the front end total pressure cavity.

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

[0031] The center line of the total pressure hole 8 deviates from the center line of the pipe body 1 by a distance of 4mm±0.5mm, so as to ensure the accuracy of total pressure sensing.

[0032] The axial distance between the front end face of the static pressure hole and the total pressure hole is 50mm, so as to ensure the accuracy of total static pressure sensing.

[0033] The outer surface of the pipe body is provided with a compensation profile, which starts from the front end face of the total pressure hole and ends at 20mm behind the static pressure hole.

[0034] The compensation profile parameters are as follows:

[0035] Step x Diameter l Diameter tolerance Δl 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 pipe body axis is X axis, and the intersection of the total pressure hole front end surface and the axis is the origin, Figure 2 The right direction of the middle horizontal is positive.

[0037] X represents the distance between a point on the pipe body axis and the total pressure hole front end surface; L represents the diameter of the point, and △L represents the diameter tolerance of the point.

[0038] The above point data is made into a circle, and then all the circles are fitted to obtain the compensation profile.

[0039] The blocking cavity is a cylinder, the distance between the inner wall of the blocking cavity and the outer wall of the pipe body is 7mm, the airflow is preliminarily decelerated in the blocking cavity, 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 resolver calculates the blocking temperature according to the output resistance value, that is, the total temperature.

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

[0041] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. 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 includes: a tube body (1), a total pressure chamber (2), a static pressure chamber (3), a gas-water separator (4), a total pressure port (5), a static pressure port (6), a blocking chamber (7), and a temperature-sensitive element (8); The tube body (1) is provided with two airtight pressure chambers (2) and static pressure chambers (3); The gas-water separator (4) is located between the total pressure chamber (2) and the static pressure chamber (3) and separates the two chambers; The front end of the tube body (1) is provided with a total pressure hole connected to the total pressure chamber. The total pressure hole includes 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 (1) is provided with a plurality of static pressure holes (6) connected to the static pressure cavity; The tube body has a blocking cavity (7) at the rear end. The blocking cavity is sleeved on the outside of the tube body. The tube body has a wire groove on the side wall. The temperature-sensitive element (8) is glued in the wire groove and led out from the back of the wire groove through the connecting wire. The front ends of the total pressure chamber conduit and the static pressure chamber conduit are connected to the gas-liquid separator and the static pressure chamber, respectively, and the rear ends are connected to the solver. The retardation cavity is a cylindrical body, and the distance between the inner wall of the retardation cavity and the outer wall of the tube is 7 mm.

2. The 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 these static pressure holes are symmetrically distributed with respect to the static pressure hole above the vertical direction, with an included angle of 60°±1°. The remaining two static pressure holes are symmetrically distributed with respect to the static pressure hole below the vertical direction, with an included angle of 75°±1°.

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

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

5. A total static pressure and total temperature sensor according to claim 1, characterized in that: The centerline of the main pressure hole (8) is offset from the centerline of the pipe body (1) by a distance of 4mm ± 0.5mm.

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

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

8. A total static pressure and total temperature sensor according to claim 1, characterized in that: The axial distance between the blocking cavity and the static pressure hole shall not be less than 58 mm.

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