CN104648676B - Icing signal sensor - Google Patents

Abstract

The invention belongs to the technical field of aviation and relates to a novel icing signal sensor. The novel icing signal sensor includes a socket, a contact point, a static pressure chamber, a bellows, a dynamic pressure chamber, a static pressure hole, a pipe head heater, an air inlet, a power supply, an elbow housing and a signal lamp, wherein the The air hole is set on the head of the sensor and communicates with the dynamic pressure chamber. The dynamic pressure chamber bears the total pressure of the airflow flowing in from the air inlet hole. The static pressure hole is set on the side of the sensor and communicates with the static pressure chamber. The static pressure of the inflowing airflow is equipped with a pipe head heater at the rear of the air intake hole, and its heat can be transferred to the air intake hole through heat conduction and can be heated and deiced. The pressure difference between the two sides of the pressure chamber and the dynamic pressure chamber automatically adjusts the expansion and contraction of the bellows, and controls the power on and off of the signal lamp and the tube head heater through the contact and disconnection of the bellows and the contact point. Head heaters are used to warm and de-ice the intake ports.

Description

An icing signal sensor

technical field

The invention belongs to the technical field of aviation and relates to an icing signal sensor.

Background technique

The traditional pneumatic icing signal sensor cannot distinguish between icing blockage and dust blockage. When the dust blocks the air intake hole, the signal light is always on, resulting in a high false alarm rate of the traditional icing signal sensor. It is urgent to adapt it Improve.

The object of the present invention is to provide an icing signal sensor with simple structure, reliable operation, convenient maintenance, no manual intervention and low false alarm rate.

The technical solution of the present invention is: an icing signal sensor, which includes a socket 1, a contact point 2, a static pressure chamber 3, a bellows 4, a dynamic pressure chamber 5, a static pressure hole 6, a nozzle heater 7, an air inlet The hole 8, the power supply 9, the elbow housing 10 and the signal lamp 11, wherein the air inlet 8 is arranged on the head of the sensor and communicates with the dynamic pressure chamber 5, and the dynamic pressure chamber 5 bears the total pressure of the airflow flowing in from the air inlet 8, The static pressure hole 6 is arranged on the side of the sensor, and communicates with the static pressure chamber 3. The static pressure chamber 3 bears the static pressure of the airflow flowing in from the static pressure hole 6. A pipe head heater 7 is arranged at the rear of the air inlet hole 8, and the bellows 4 It is an electrical conductor, and automatically adjusts the expansion and contraction of the bellows 4 through the pressure difference between the static pressure chamber 3 and the dynamic pressure chamber 5 inside and outside the bellows 4; controls the signal lamp 11 and the tube through the contact and disconnection of the bellows 4 and the contact point 2 The power on and off of the head heater 7, when the circuit is connected, utilize the pipe head heater 7 to heat and deice the air inlet 8.

When the engine is working, when the internal pressure of the dynamic pressure chamber 5 is less than or equal to the internal pressure of the static pressure chamber 3, the end surface of the bellows 4 and the contact point 2 are in a closed state; when the internal pressure of the dynamic pressure chamber 5 is greater than the internal pressure of the static pressure chamber 3 , the end surface of the bellows 4 is disconnected from the contact point 2.

The present invention has the advantages and effects: the icing signal sensor combines icing blockage with electric heating deicing, uses the periodic flashing of the signal light 11 to predict icing, and uses the constant light of the signal light 11 to predict unexpected situations (such as The air intake hole 8 is blocked by dust), compared with the traditional icing signal sensor, the occurrence of false alarm rate can be greatly reduced. And the whole process does not need manual intervention, reliable work, convenient maintenance, simple structure, and has great practical application value.

Description of drawings

Fig. 1 is a structural schematic diagram of the icing signal sensor.

Among them: socket 1; contact point 2; static pressure chamber 3; bellows 4; dynamic pressure chamber 5; static pressure hole 6; pipe head heater 7; .

detailed description

The present invention will be further described below in conjunction with specific drawings.

Please refer to FIG. 1 , which is a schematic structural diagram of the icing signal sensor. The icing signal sensor includes socket 1, contact point 2, static pressure chamber 3, bellows 4, dynamic pressure chamber 5, static pressure hole 6, pipe head heater 7, air inlet 8, power supply 9, elbow housing 10 and a signal lamp 11, wherein the air inlet 8 is arranged on the head of the sensor and communicates with the dynamic pressure chamber 5, the dynamic pressure chamber 5 bears the total pressure of the airflow flowing in from the air inlet 8, and the static pressure hole 6 is arranged on the side of the sensor, It communicates with the static pressure chamber 3, and the static pressure chamber 3 bears the static pressure of the airflow flowing in from the static pressure hole 6. A pipe head heater 7 is arranged at the rear of the air inlet hole 8, and its heat can be transferred to the air inlet hole 8 through heat conduction and can be It is heated and deiced, and the bellows 4 is an electric conductor. When the engine is working, when the internal pressure of the dynamic pressure chamber 5 is less than or equal to the internal pressure of the static pressure chamber 3, the end face of the bellows 4 and the contact point 2 are in a closed state. When the internal pressure of the dynamic pressure chamber 5 is greater than the internal pressure of the static pressure chamber 3 , the end surface of the bellows 4 is disconnected from the contact point 2 .

The working principle of the icing signal sensor is as follows:

The expansion and contraction of the bellows 4 is automatically adjusted by the pressure difference between the static pressure chamber 3 and the dynamic pressure chamber 5 inside and outside the bellows 4; the signal lamp 11 and the tube head heater 7 are controlled by the contact and disconnection of the bellows 4 and the contact point 2 When the circuit is switched on, use the tube head heater 7 to heat and de-ice the air inlet 8.

The actual working process is as follows:

When the engine is not working, there is no airflow stamping effect, the pressure difference between the dynamic pressure chamber 5 and the static pressure chamber 3 is 0, the contact point 2 is closed, and the signal light 11 is off because the power supply 9 is not powered; when the engine is working, the dynamic pressure chamber 5 bears the total pressure of the airflow flowing in from the air inlet 8, and the static pressure chamber 3 bears the static pressure of the airflow flowing in from the static pressure hole 6. Since the internal pressure of the dynamic pressure chamber 5 is greater than the internal pressure of the static pressure chamber 3, the bellows 4 is compressed, and the contact point 2 is disconnected, although the power supply 9 is energized at this time, the signal light 11 is off; when encountering icing in flight, the head air inlet 8 is blocked by ice, and the air flow cannot enter the dynamic pressure chamber 5, because the internal pressure of the dynamic pressure chamber 5 is lower than the static pressure chamber 5. The internal pressure of the pressure chamber 3, the capsule 4 returns to the original position, and the contact point 2 is closed. At this time, the power supply 9 is powered on, the signal lamp 11 is turned on, and at the same time, the circuit of the tube head heater 7 is turned on to heat the air inlet 8 When heating to the melting of the ice on the air inlet 8, the air inlet 8 is opened, and the air-flow enters the dynamic pressure chamber 5 again, because the internal pressure of the dynamic pressure chamber 5 is greater than the internal pressure of the static pressure chamber 3, the bellows 4 is compressed, and the contact Point 2 is disconnected, signal light 11 is extinguished, and the heating of pipe head heater 7 is stopped simultaneously; If the aircraft is still flying under icing conditions, the air intake hole 8 will be blocked again; when the aircraft is flying under icing conditions , the signal lamp 11 will flash periodically; when the air intake hole 8 is blocked by dust, the signal lamp 11 will remain on all the time (false alarm).

Claims (2)

1. A freezing signal sensor is characterized in that it comprises a socket (1), a contact point (2), a static pressure chamber (3), a bellows (4), a dynamic pressure chamber (5), a static pressure hole ( 6), tube head heater (7), air intake hole (8), power supply (9), elbow housing (10) and signal lamp (11), wherein the air intake hole (8) is arranged on the head of the sensor , communicated with the dynamic pressure chamber (5), the dynamic pressure chamber (5) bears the total pressure of the airflow flowing in from the air inlet (8), the static pressure hole (6) is arranged on the side of the sensor, and communicates with the static pressure chamber (3), The static pressure chamber (3) bears the static pressure of the airflow flowing in from the static pressure hole (6), and a pipe head heater (7) is arranged at the rear of the air inlet hole (8). (4) The pressure difference between the inner and outer static pressure chamber (3) and the dynamic pressure chamber (5) automatically adjusts the expansion and contraction of the bellows (4); through the contact and disconnection of the bellows (4) and the contact point (2) Control signal light (11) and pipe head heater (7) on-off power, after circuit is connected, utilize pipe head heater (7) to come heating deicing to air inlet (8). 2. A kind of icing signal sensor according to claim 1, characterized in that, when the engine is working, when the internal pressure of the dynamic pressure chamber (5) is less than or equal to the internal pressure of the static pressure chamber (3), the bellows (4) The end surface of the bellows (4) and the contact point (2) are in a closed state. When the internal pressure of the dynamic pressure chamber (5) is greater than the internal pressure of the static pressure chamber (3), the end surface of the bellows (4) is disconnected from the contact point (2). state.