Expandable total pressure sensor

Abstract

The present invention belongs to the field of atmospheric data measurement technology, and specifically relates to an expandable total pressure sensor. The sensor comprises: a housing, a tube body, a shaping plate, a shaft, a short shaft, a hose, a nozzle, and a large cover plate. The housing is provided with an elongated groove, the tube body is disposed within the elongated groove, and one end of the tube body is hinged to the housing via the shaft. The shaping plate is disposed within the groove and located below the tube body, and one end of the shaping plate is hinged to the middle of the tube body via the short shaft. The total pressure chamber at the rear of the tube body is connected to the nozzle via a hose to form a total pressure system. A large cover plate is provided above the housing. In a non-operating state, the tube body and shaping plate are both retracted into the elongated groove of the housing, and the tube body conforms to the housing. In an operating state, the tube body extends out of the housing, and the shaping plate conforms to the housing.

Description

Technical Field

[0001] The present invention belongs to the field of atmospheric data measurement technology, and in particular relates to a deployable total pressure sensor that can be directly applied to total pressure measurement of aircraft with stealth requirements. Background Art

[0002] The total pressure sensor is an important component of the aircraft's atmospheric data system. It can sense the total pressure signal during the aircraft's flight and transmit it to the atmospheric data solution equipment for calculating flight parameters such as indicated airspeed, true airspeed, and Mach number.

[0003] Total pressure sensors are typically installed on the outside of an aircraft's skin. Traditional total pressure sensors are fixed relative to the aircraft and mounted outside the fuselage, resulting in poor stealth performance. Current aerospace developments are placing high demands on aircraft stealth performance, and traditional total pressure sensors cannot meet these requirements. Summary of the Invention

[0004] The purpose of the present invention is to provide a deployable total pressure sensor that can improve the total pressure measurement accuracy of an aircraft while taking into account the stealth performance of the aircraft.

[0005] Technical solution:

[0006] An expandable total pressure sensor comprises: a shell, a tube body, a shaping plate, a shaft, a short shaft, a hose, a nozzle, and a large cover plate;

[0007] The shell is provided with a long strip groove, the tube body is arranged in the long strip groove and one end of the tube body is hinged to the shell through a shaft.

[0008] The shaping plate is arranged in the groove and located below the tube body, and one end of the shaping plate is hinged to the middle part of the tube body through a short shaft;

[0009] The total pressure chamber at the tail of the pipe body is connected to the pipe nozzle through a hose to form a total pressure system;

[0010] A large cover plate is provided above the shell;

[0011] When not in operation, the tube body and the shaping plate are retracted into the long strip groove of the shell, and the tube body conforms to the shell;

[0012] In the working state, the tube body extends out of the shell, and the shaping plate conforms to the shell.

[0013] Furthermore, the deployable total pressure sensor further comprises: a torsion spring;

[0014] The torsion spring is sleeved on the shaft, one end of the torsion spring is fixed to the shell, and the other end is fixed to the tube body. The torsion spring is compressed and stores energy when it is not in operation, and releases energy to drive the tube body to rotate and pop out when the expandable total pressure sensor switches to the working state.

[0015] Furthermore, the deployable total pressure sensor further comprises: a compression spring;

[0016] The two ends of the compression spring are respectively fixed to the inner surface of the trimming plate and the bottom of the long strip groove of the outer shell;

[0017] The compression spring is compressed and stores energy in a non-working state, and releases the energy to eject the shaping plate when the deployable total pressure sensor switches to a working state.

[0018] Furthermore, a limiting platform is provided on the side of the shaping plate away from the hinged connection with the tube body, and a clamping platform is provided on the edge of the long strip groove of the shell;

[0019] The clamping platform cooperates with the limiting platform to prevent the shaping plate from being excessively ejected.

[0020] Furthermore, the expandable total pressure sensor further comprises: a compression spring A, a positioning pin and a screw;

[0021] A positioning pin hole is provided on the side of the bottom of the tube body;

[0022] The housing is provided with a three-stepped hole at a position corresponding to the positioning pin hole, the three-stepped hole connecting the long strip groove and the outer surface of the housing and the diameter increases from the inside to the outside;

[0023] The screw is set at the largest diameter of the three-step hole.

[0024] The positioning pin is composed of a circular shaft and a truncated cone. The diameter of the truncated cone is larger than that of the circular shaft. The circular shaft extends into the smallest diameter of the three-step hole, and the length of the circular shaft is greater than the length of the smallest diameter of the three-step hole.

[0025] The positioning pin and the screw are connected by a compression spring A. The compression spring A stores energy when in a non-working state. When switched to a working state, the tube body pops out into place, and the compression spring A drives the positioning pin to pop out. The positioning pin is inserted into the positioning pin hole of the tube body to achieve positioning of the tube body.

[0026] The front end of the circular shaft of the positioning pin is hemispherical;

[0027] The side surface of the positioning pin cone is provided with a radial protrusion, and the inner surface side wall of the middle level of the three-level stepped hole is provided with an axial groove;

[0028] The radial protrusion cooperates with the axial groove to guide the positioning pin and prevent it from rotating.

[0029] Furthermore, the front end side wall of the tube body is also provided with a positioning pin hole A;

[0030] The side wall of the shell is provided with a through hole;

[0031] When not in operation, the positioning pin A is driven by an external electromagnetic valve to lock the tube body.

[0032] Furthermore, an armored heater is provided in the tube body.

[0033] Furthermore, the expandable total pressure sensor further comprises: a connector and a wire;

[0034] The connector is arranged on the outside of the shell and is connected to the armored heater through a wire, and is used to control the operation of the armored heater and supply power to it.

[0035] Furthermore, a layer of rubber plate of the same shape is provided above the large cover plate.

[0036] The advantages of the present invention are good stealth performance, high pressure measurement accuracy, miniaturization, lightness, and the ability to meet the requirements of installation and use in a narrow space on an aircraft, and high practicality and economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Attachment Figure 1 : Schematic diagram of the external structure of an expandable total pressure sensor;

[0038] Attachment Figure 2 : A schematic diagram of the internal structure of an expandable total pressure sensor;

[0039] Attachment Figure 3 : Schematic diagram of the tube body limiting mechanism;

[0040] Attachment Figure 4 : Schematic diagram of the trim plate limiting mechanism;

[0041] Attachment Figure 5 : Closed diagram of total pressure sensor in non-working state;

[0042] Attachment Figure 6 : Expanded diagram of the total pressure sensor working state;

[0043] The following are the descriptions of the reference numerals:

[0044] 1-Modifying plate, 2-Tube body, 3-Short shaft, 4-Torsion spring, 5-Rubber plate, 6-Nipple, 7-Screw, 8-Shaft, 9-Casing, 10-Large cover, 11-Connector, 12-Wire, 13-Hose, 14-Locking pin hole, 15-Locking pin hole A, 16-Compression spring, 17-Locking pin, 18-Compression spring A. DETAILED DESCRIPTION

[0045] This technical solution introduces a deployable total pressure sensor, such as Figure 1 and Figure 2 As shown, it includes a trimming plate 1, a tube body 2, a short shaft 3, a torsion spring 4, a rubber plate 5, a nozzle 6, a screw 7, a shaft 8, a housing 9, a large cover 10, a connector 11, a wire 12, a hose 13, a positioning pin hole 14, a positioning pin hole A15, a compression spring 16, a positioning pin 17, a compression spring A18 and other parts.

[0046] The outer shell 9 is provided with a long strip groove for installing the tube body 2 and the trimming plate 1. A long strip mounting groove is provided on the outer middle part of the tube body 2, and a blind hole is provided inside the outer shell 9 for installing the torsion spring 4. One end of the torsion spring 4 is fixed to the tube body 2, and the other end is fixed to the outer shell 9. The tube body 2, the outer shell 9 and the torsion spring 4 are hinged through the shaft 8; a positioning pin hole A15 is provided on one side of the tube body 2, and a notch is provided on one side of the large cover plate. Countersunk holes are provided at both ends of the notch for installing the solenoid valve. The cylindrical boss of the solenoid valve is inserted into the positioning pin hole A15 for locking and positioning when the sensor is not in working state; the trimming plate 1 and the tube body 2 are hinged through the shaft 3, one end of the compression spring 16 is fixed to the bottom of the shell 9, and the other end is fixed to the inner surface of the trimming plate 1. The trimming plate is provided with a limit platform away from the hinged side of the tube body to form a limit with the outer shell card platform, such as Figure 4 As shown; a water leakage hole is opened on one side of the pipe body 2, and the rear of the total pressure chamber is connected to the nozzle 6 through a hose 13 to form a total pressure system; an armored heater is installed inside the pipe body and connected to the connector 11 through a wire 12 to form a heating system. Screw 7, positioning pin 17, compression spring A18, positioning pin hole 14 and shell 9 constitute the pipe body limiting mechanism, as shown Figure 3 As shown, the positioning pin 17 consists of a circular shaft and a circular cone. The circular cone has a radial protrusion on the side, the front end of the circular shaft is hemispherical, and the outer shell has three stepped holes with decreasing diameters from the outside to the inside. The middle stepped hole has a guide groove to prevent the positioning pin 17 from rotating. The product has two states: non-operating state and operating state.

[0047] When the total pressure sensor is in non-working state, Figure 5 As shown, the solenoid valve locks the tube body, the compression spring 16 and the torsion spring 4 are compressed to store energy, the trimming plate 1 is retracted into the shell, and the total pressure tube body 2 is integrated with the aircraft skin shape, which can effectively improve the stealth performance of the aircraft and avoid the total pressure sensor from icing in the closed state.

[0048] When the total pressure sensor is in working state, Figure 6As shown, the solenoid valve receives instructions from the aircraft, and the cylindrical boss is pulled out from the positioning pin hole A15. The energy stored in the compression spring 16 and the torsion spring 4 is quickly released, and the total pressure tube body 2 rotates to a predetermined position. The trimming plate 1 pops out under the driving action of the total pressure tube body 2 and the compression spring 16, and merges with the aircraft skin shape. The positioning pin 17 in the tube body limiting mechanism pops out and fixes the total pressure tube body 2. The trimming plate 1 relies on itself and the total pressure tube body 2 limiting mechanism to be fixed in place, avoiding the tube body 2 and the trimming plate 1 from reciprocating motion under the influence of aerodynamic loads and vibration loads, which can effectively improve the total pressure measurement accuracy to meet the aerodynamic performance requirements.

[0049] An armored heater is arranged inside the total pressure tube of the sensor, and the onboard power signal is provided to the heater through the connector 11, thereby improving the anti-icing performance in harsh environments and effectively improving the total pressure measurement accuracy of the product in harsh environments;

[0050] When the sensor is in operation, there is an angle between the sensor and the aircraft axis, and the total pressure measurement accuracy is greatly affected by the airflow deflection. The total pressure pipe body can be designed with different bevel angles at the front end of the total pressure port according to different aircraft and different installation positions to ensure that the total pressure port faces the airflow, which can effectively improve the total pressure measurement accuracy.

[0051] The sensor adopts a miniaturized and lightweight design, which reduces the weight of the tube body, ensures the tube body's ejection speed and total pressure measurement response speed, and can effectively improve the stealth performance and aerodynamic performance of the aircraft.

Claims

1. An expandable total pressure sensor, characterized in that: The expandable total pressure sensor comprises: a housing, a tube body, a shaping plate, a shaft, a short shaft, a hose, a nozzle, a large cover plate, and a compression spring; The shell is provided with a long strip groove, the tube body is arranged in the long strip groove and one end of the tube body is hinged to the shell through a shaft. The shaping plate is arranged in the groove and located below the tube body, and one end of the shaping plate is hinged to the middle part of the tube body through a short shaft; The total pressure chamber at the tail of the pipe body is connected to the pipe nozzle through a hose to form a total pressure system; A large cover plate is provided above the shell; When not in operation, the tube body and the shaping plate are retracted into the long strip groove of the shell, and the tube body conforms to the shell; In the working state, the tube body extends out of the shell, and the shaping plate conforms to the shell; The two ends of the compression spring are respectively fixed to the inner surface of the trimming plate and the bottom of the long strip groove of the outer shell; The compression spring is compressed and stores energy when in a non-working state, and releases the energy to eject the shaping plate when the expandable total pressure sensor switches to a working state; a limiting platform is provided on the side of the shaping plate away from the hinged connection with the tube body, and a clamping platform is provided on the edge of the long strip groove of the shell; the clamping platform cooperates with the limiting platform to prevent the shaping plate from being ejected excessively; An armored heater is provided in the tube body.

2. The expandable total pressure sensor according to claim 1, characterized in that: The deployable total pressure sensor further comprises: a torsion spring; The torsion spring is sleeved on the shaft, one end of the torsion spring is fixed to the shell, and the other end is fixed to the tube body. The torsion spring is compressed and stores energy when it is not in operation, and releases energy to drive the tube body to rotate and pop out when the expandable total pressure sensor switches to the working state.

3. The expandable total pressure sensor according to claim 1, characterized in that: The deployable total pressure sensor further comprises: a compression spring A, a positioning pin and a screw; A positioning pin hole is provided on the side of the bottom of the tube body; The housing is provided with a three-stepped hole at a position corresponding to the positioning pin hole, the three-stepped hole connecting the long strip groove and the outer surface of the housing and the diameter increases from the inside to the outside; The screw is set at the largest diameter of the three-step hole. The positioning pin is composed of a circular shaft and a truncated cone. The diameter of the truncated cone is larger than that of the circular shaft. The circular shaft extends into the smallest diameter of the three-step hole, and the length of the circular shaft is greater than the length of the smallest diameter of the three-step hole. The positioning pin and the screw are connected by a compression spring A. The compression spring A stores energy when in a non-working state. When switched to a working state, the tube body pops out into place, and the compression spring A drives the positioning pin to pop out. The positioning pin is inserted into the positioning pin hole of the tube body to achieve positioning of the tube body. The front end of the circular shaft of the positioning pin is hemispherical; The side surface of the positioning pin cone is provided with a radial protrusion, and the inner surface side wall of the middle level of the three-level stepped hole is provided with an axial groove; The radial protrusion cooperates with the axial groove to guide the positioning pin and prevent it from rotating.

4. The expandable total pressure sensor according to claim 1, characterized in that: The front end side wall of the tube body is also provided with a positioning pin hole A; The side wall of the shell is provided with a through hole; When not in operation, the positioning pin A is driven by an external electromagnetic valve to lock the tube body.

5. The expandable total pressure sensor according to claim 1, characterized in that: The expandable total pressure sensor further includes: a connector and a wire; The connector is arranged on the outside of the shell and is connected to the armored heater through a wire, and is used to control the operation of the armored heater and supply power to it.

6. The expandable total pressure sensor according to claim 1, characterized in that: A layer of rubber plate with the same shape is arranged above the large cover plate.

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