An emergency total static pressure sensor

Abstract

This invention discloses an emergency total static pressure sensor, comprising a housing with a flip-top mechanism at the opening on the top surface of the housing. When the flip-top mechanism is closed, it covers the opening of the housing; when the flip-top mechanism is opened, the total static pressure sensor housed inside the housing can be pushed upwards through the opening on the top surface of the housing by an ejection mechanism. This allows the total static pressure sensor to be concealed inside the housing during normal operation, without compromising the overall aerodynamics of the fuselage; and in emergency situations where the original total static pressure sensor fails, it can quickly deploy the pitot tube to accurately collect air pressure data.

Description

Technical Field

[0001] This invention belongs to the field of atmospheric data systems, and particularly relates to an emergency total static pressure sensor. Background Technology

[0002] The atmospheric data system is used to measure flight status parameters of an aircraft, such as air pressure altitude, airspeed, Mach number, total temperature, angle of attack, and sideslip angle. It generally consists of a total static pressure sensor that senses air pressure, an angle of attack / sideslip angle sensor that senses angle of attack / sideslip angle, a total temperature sensor that senses total temperature, and an atmospheric data computer that performs atmospheric parameter calculations. It is an important subsystem for ensuring the flight safety of an aircraft.

[0003] Currently, there are two main designs for total static pressure sensors. One is to install a pitot tube at the nose of the aircraft to sense air pressure, which belongs to a distributed atmospheric data system based on a multi-functional probe; the other is to sense air pressure through an opening in the fuselage, which belongs to an embedded atmospheric data system. The first design will compromise the overall aerodynamics of the fuselage to some extent, making it difficult to meet the requirements of increasingly complex combat environments; the second design has poor resistance to airflow interference and requires extremely complex algorithms to calculate air pressure data. Summary of the Invention

[0004] Purpose of the invention

[0005] To meet the requirements of the total static pressure sensor under different conditions, this invention provides an emergency total static pressure sensor.

[0006] Invention Technology Solutions

[0007] An emergency total static pressure sensor includes a housing. A flip-top mechanism is provided at the opening on the top surface of the housing. When the flip-top mechanism is closed, it blocks the opening of the housing. When the flip-top mechanism is opened, the total static pressure sensor installed inside the housing can be pushed upwards out of the opening on the top surface of the housing by the push-out mechanism.

[0008] Preferably, the flip-top mechanism includes an upper flip-top and a lower flip-top. The bottom surfaces of both the upper and lower flip-tops are connected to one end of two cover rods. The other ends of the two cover rods are connected via spring mounting rods. The spring mounting rods are fixed to the housing. The cover rods can rotate relative to the spring mounting rods. Both ends of the spring mounting rods are provided with torsion springs. One end of the torsion spring is connected to the cover rod, and the other end is fixed to the housing. Under the action of the torsion springs, the upper and lower flip-tops always tend to flip downwards. The bottom surface of the upper flip-top has a groove, and the protrusion on the lower flip-top can cooperate with the groove on the upper flip-top. When the lower flip-top is locked, the lower flip-top can prevent the upper flip-top from flipping.

[0009] Preferably, it also includes a flip cover locking mechanism, which includes upper and lower mounting blocks fixed to the housing. A positioning pin is movably disposed in the holes on the upper and lower mounting blocks and can move within the holes. A spring is also provided in the holes on the upper and lower mounting blocks. When the flip cover mechanism is in the closed state, the positioning pin can be pushed by the spring to insert into the hole on the cover rod of the lower flip cover to lock the flip cover mechanism. The positioning pin is connected to the cab handle through a cable. When the cab handle is pulled, the positioning pin retracts and releases the lock on the flip cover mechanism.

[0010] Preferably, a retrieval rod is fixed to the outside of one of the cover rods of the lower flip cover and the upper flip cover, and the retrieval rod passes through the retrieval hole on the housing and extends out of the housing.

[0011] Preferably, the total static pressure sensor is fixed on the total static pressure sensor mounting base. The ejection mechanism includes a gas spring switch mounted on the housing. One end of the gas spring is fixed to the housing, and the other end of the gas spring is fixed to the bottom surface of the total static pressure sensor mounting base. When the pilot pulls the handle, the cable is pulled out of the positioning pin, the flip-top mechanism opens, and the upper or lower flip-top strikes the gas spring switch, causing the gas spring to extend and push the total static pressure sensor upward.

[0012] Preferably, it also includes an ejection locking mechanism, which includes a wedge block connected to the inner wall of the housing. A spring is provided between the wedge block and the housing. The wedge block and the housing are connected by a raised nut. Pulling the raised nut outward from the housing can retract the wedge block. When the total static pressure sensor moves upward, the wedge block is ejected. When the total static pressure sensor moves above the wedge block, the wedge block pops out under the action of the spring force and locks the total static pressure sensor mounting base.

[0013] Preferably, the guide post on the housing extends into the hole on the wedge block, the wedge block can move along the guide post, the second spring is set on the guide post, the main body of the raised nut passes through the hole on the housing and the wedge block, the main body of the raised nut is threaded to the screw at the end away from the housing, the outer diameter of the main body of the raised nut away from the wedge block is larger than the diameter of the hole on the housing through which the main body of the raised nut passes, the thickness of the wedge block gradually increases from bottom to top, and the side of the wedge block away from the inner wall of the housing is an arc surface.

[0014] Preferably, it also includes an ejection and recovery mechanism, which pulls the total static pressure sensor back into the housing when it is necessary to retract the total static pressure sensor.

[0015] Preferably, the retraction mechanism includes a steel cable, one end of which is connected to the bottom surface of the total static pressure sensor mounting base, and the other end of which is fixed to a winch. The winch is mounted on the housing. By rotating the winch, the steel cable is wound around it, and the steel cable can pull the total static pressure sensor back into the housing.

[0016] Preferably, a slide rail is vertically arranged on the inner wall of the housing, and the bearing on the total static pressure sensor mounting base can move along the slide rail.

[0017] Advantages of this invention:

[0018] During normal operation, the total static pressure sensor is hidden inside the housing, without compromising the overall aerodynamics of the fuselage; in case of an emergency where the original total static pressure sensor fails, the airspeed tube can be quickly deployed to accurately collect air pressure data. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the top-opening cover.

[0020] Figure 2 This is a schematic diagram of the flip-down cover.

[0021] Figure 3 This is a schematic diagram showing the location of the flip-top locking mechanism.

[0022] Figure 4 This is a schematic diagram of the flip-top locking mechanism.

[0023] Figure 5 This is a schematic diagram showing the location of the recovery rod.

[0024] Figure 6 This is a schematic diagram showing the state of the total static pressure sensor being deactivated.

[0025] Figure 7 A schematic diagram showing the location of the locking mechanism.

[0026] Figure 8 A schematic diagram of the structure for launching the locking mechanism.

[0027] Figure 9 A schematic diagram of the structure for launching the recycling facility.

[0028] Figure 10 This is a schematic diagram of the flip mechanism when closed.

[0029] In the diagram: 1 Upper flip cover, 2 Lower flip cover, 3 Torsion spring, 4 Cover rod, 5 Spring mounting rod, 6 Flip cover locking mechanism, 601 Positioning pin, 602 Spring 1, 603 Cable, 604 Guide block, 7 Retraction rod, 8 Total static pressure sensor, 9 Total static pressure sensor mounting base, 10 Bearing, 11 Slide rail, 12 Push-out locking mechanism, 1201 Wedge block, 1202 Spring 2, 1203 Raised nut, 13 Housing, 14 Gas spring, 15 Winch, 16 Steel cable. Detailed Implementation

[0030] The present invention is achieved through the following technical solution.

[0031] An emergency total static pressure sensor includes a flip-top mechanism, a flip-top locking mechanism, an ejection mechanism, an ejection locking mechanism, and an ejection recovery mechanism.

[0032] A flip-top mechanism is located at the opening on the upper part of the housing 13 to cover the opening. The flip-top mechanism includes a torsion spring 3, a cover rod 4, a spring mounting rod 5, an upper flip-top 1, and a lower flip-top 2. When the flip-top mechanism is closed, one end face of the upper flip-top 1 and the lower flip-top 2 are in contact. When the flip-top mechanism is opened, both the upper flip-top 1 and the lower flip-top 2 flip downwards under the force of the torsion spring 3. Two cover rods 4 are connected to the bottom surface of the upper flip-top 1. One end of the cover rod 4 is connected to the upper flip-top 1, and a spring mounting rod 5 is rotatably mounted between the other ends of the two cover rods 4. The spring mounting rod 5 is fixed to the housing 13, and torsion springs 3 are respectively provided at both ends of the spring mounting rod 5. One end of the torsion spring 3 is connected to the adjacent cover rod 4, and the other end of the torsion spring 3 is fixed to the housing 13. Two cover rods 4 are connected to the bottom surface of the lower flip cover 2. One end of each cover rod 4 is connected to the lower flip cover 2, and a spring mounting rod 5 is rotatably mounted between the other ends of the two cover rods 4. The spring mounting rod 5 is fixed to the housing 13. Torsion springs 3 are respectively provided at both ends of the spring mounting rod 5. One end of each torsion spring 3 is connected to the adjacent cover rod 4, and the other end is fixed to the housing 13. The bottom surface of the upper flip cover 1 near the lower flip cover 2 has a groove, and the bottom surface of the lower flip cover 2 has a protrusion that can cooperate with the groove on the upper flip cover 1, so that the upper flip cover 1 can be locked synchronously when the lower flip cover 2 is locked. One end of the torsion spring 3 is fixed by a screw on the cover rod 4, and the other end is stuck on the housing 13. The flip cover is in the open state in its natural state. The bottom surface of the cover rod 4 has a protrusion. When the flip cover mechanism is opened, after the upper and lower flip covers rotate 90°, the protrusion on the cover rod 4 contacts the inner wall of the housing 13 to prevent the upper and lower flip covers from continuing to rotate, thus avoiding infinite rotation. In this embodiment, the cover rod 4 has a V-shaped structure. The connection between the cover rod 4 and the spring mounting rod 5 is equipped with a bearing to reduce rotational resistance. A retrieval rod 7 is fixed to the outside of one of the cover rods 4 of the lower flip cover 2 and the upper flip cover 1. The retrieval rod 7 passes through the retrieval hole on the housing 13 and extends out of the housing 13. To facilitate the rotation of the retrieval rod 7, in this embodiment, the end of the retrieval rod 7 extending out of the housing 13 is hexagonal.

[0033] Since the spring opens the flip cover in its natural state, a flip cover locking mechanism 6 is needed to secure the flip cover in the closed state. For example... Figure 3As shown, the flip-top locking mechanism 6 includes upper and lower mounting blocks fixed to the housing 13. A positioning pin 601 is movably disposed in holes on the upper and lower mounting blocks and can move within the holes. A spring 602 is also disposed in the holes on the upper and lower mounting blocks. The spring 602 can push the positioning pin 601, causing the positioning pin 601 to insert into the hole on the cover rod 4 of the lower flip-top 2, thereby locking the flip-top mechanism. The end of the positioning pin 601 away from the lower flip-top 2 is connected to the cab handle via a cable 603. When the flip-top mechanism is closed, the positioning pin 601 is ejected by the spring force and locks the cover rod 4 of the lower flip-top 2, thereby locking the flip-top mechanism. When the cab handle is pulled, the positioning pin 601 retracts, and the lower flip-top 2 opens under the torsion force of the torsion spring 3. The mating surfaces of the upper and lower mounting blocks are fitted with a concave-convex structure to shorten the length of the flip-top locking mechanism 6 and facilitate the assembly of the positioning pin 601. The cable 603 is connected to the cab handle after passing through the guide block 604 fixed on the housing 13. The guide block 604 has a guide groove for guiding the cable 603.

[0034] After the aircraft lands, the emergency total static pressure sensor 8 needs to be retracted and the flip-top mechanism closed. Use an Allen wrench to rotate the retraction lever 90° to close the flip-top mechanism. Specifically, rotate the upper flip-top first, then rotate the lower flip-top. The lower flip-top presses down on the upper flip-top. Once in position, the locating pin 601 pops out and locks the lower flip-top, achieving the purpose of flip-top retraction and closure.

[0035] The total static pressure sensor 8 is fixed on the total static pressure sensor mounting base 9. The ejection mechanism includes a gas spring switch mounted on the housing 13. One end of the gas spring 14 is fixed to the housing 13, and the other end is fixed to the bottom surface of the total static pressure sensor mounting base 9. When the pilot pulls the handle, causing the cable 603 to pull out the positioning pin 603, the flip-top mechanism opens, and the upper flip-top 1 or lower flip-top 2 strikes the gas spring switch, causing the gas spring 14 to extend and push the total static pressure sensor 8 upward. In this embodiment, four slide rails 11 are vertically arranged on the housing 13, and four bearings are arranged on the total static pressure sensor mounting base 9. The bearings can move along the slide rails 11.

[0036] The locking mechanism 12 includes a wedge block 1201 connected to the inner wall of the housing 13. A guide post on the housing 13 extends into a hole in the wedge block 1201, allowing the wedge block 1201 to move along the guide post. A second spring 1202 is mounted on the guide post, with both ends of the second spring 1202 limited by the wedge block 1201 and the housing 13, respectively. A raised nut 1203 is located at the lower part of the wedge block 1201. The main body of the raised nut 1203 passes through the hole in the housing 13 and the wedge block 1201. A screw is threaded to the end of the raised nut 1203 away from the housing 13. The outer diameter of the end of the raised nut 1203 away from the wedge block 1201 is larger than the diameter of the hole in the housing 13 through which the main body of the raised nut 1203 passes. The thickness of the wedge block 1201 gradually increases from bottom to top. In this embodiment, the side of the wedge block 1201 away from the inner wall of the housing 13 is an arc surface. When the gas spring 14 pushes the total static pressure sensor 8 upward, it will push against the release locking mechanism, causing the wedge block 1201 to contract under force. When the total static pressure sensor 8 passes the wedge block 1201, the wedge block 1201 is ejected by the spring force and locks the total static pressure sensor mounting base 9. Pulling the protruding nut 1203 from the outside of the housing 13 will pull the wedge block 1201 back and unlock the release locking mechanism 12.

[0037] In this embodiment, the launch and recovery mechanism adopts a steel cable drum mechanism. A steel cable 16 is fixed to the bottom surface of the total static pressure sensor mounting base 9, and the other end of the steel cable 16 is fixed to a winch 15. The winch 15 is set on the housing 13. After unlocking the launch locking mechanism, rotating the winch 15 drives the steel cable 16 to pull the total static pressure sensor 8 back to the machine body. During ground recovery, simply rotate the winch 15 to wind the steel cable 16 onto the winch 15, thereby resetting the total static pressure sensor 8.

[0038] Working principle:

[0039] When the sensor is not in operation, the flip-top mechanism closes to avoid compromising the aerodynamic performance of the fuselage. In an emergency, the operator pulls the handle, and cable 603 acts on positioning pin 601; cable 603 pulls out of positioning pin 601, and the flip-top mechanism is subjected to the torque of torsion spring 3, causing the upper and lower covers to flip 90° and open simultaneously. When the upper flip-top 1 or lower cover 2 is in position, it will strike the gas spring switch on housing 13, triggering gas spring 14 to push out the total static pressure sensor 8; during the movement of the total static pressure sensor 8, wedge block 1201 is first compressed and then ejected, thereby locking the total static pressure sensor 8. At this time, the total static pressure sensor 8 begins to collect the total static pressure signal and operates normally.

[0040] After the aircraft returns to the ground, first pull out the positioning pin 601 of the flip cover locking mechanism 6, and then pull the cable of the gas spring to pull the ejection mechanism into the housing; next, use an Allen wrench to rotate the rotating shaft on the upper flip cover 90° counterclockwise and the rotating shaft on the lower flip cover 2 90° clockwise, release the cockpit control handle, and after the flip cover mechanism flips into place, the positioning pin 601 will automatically pop out and lock the flip cover mechanism to achieve the skin closure stealth function.

[0041] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be used to limit the scope of protection of the present invention. All equivalent transformations or modifications made according to the spirit and essence of the present invention should be covered within the scope of protection of the present invention. The technologies, shapes, and structures not described in detail in this invention are all well-known technologies.

Claims

1. An emergency total static pressure sensor, characterized in that, Includes a housing (13), and a flip-top mechanism is provided at the opening on the top surface of the housing (13). When the flip-top mechanism is closed, it blocks the opening of the housing (13). When the flip-top mechanism is opened, the total static pressure sensor (8) provided inside the housing (13) can be pushed upward through the opening on the top surface of the housing (13) by the push-out mechanism. The total static pressure sensor (8) is fixed on the total static pressure sensor mounting base (9). The push-out mechanism includes a gas spring switch set on the housing (13). One end of the gas spring (14) is fixed on the housing (13), and the other end of the gas spring (14) is fixed on the bottom surface of the total static pressure sensor mounting base (9). When the pilot pulls the handle, the cable (603) is pulled out of the positioning pin (601), and the flip-top mechanism opens. The upper flip-top (1) or the lower flip-top (2) strikes the gas spring switch. When closed, the gas spring (14) extends and pushes the total static pressure sensor (8) upward; the flip-top mechanism includes an upper flip-top (1) and a lower flip-top (2). The bottom surfaces of the upper flip-top (1) and the lower flip-top (2) are connected to one end of two cover rods (4). The other ends of the two cover rods (4) are connected by spring mounting rods (5). The spring mounting rods (5) are fixed on the housing (13). The cover rods (4) can rotate relative to the spring mounting rods (5). Both ends of the spring mounting rods (5) are provided with torsion springs (3). One end of the torsion spring (3) is connected to the cover rod (4), and the other end is fixed to the housing (13). The upper cover (1) and the lower cover (2) tend to flip downward under the action of the torsion spring (3). When the lower cover (2) is locked, the lower cover (2) can prevent the upper cover (1) from flipping. It also includes a cover locking mechanism (6). The cover locking mechanism (6) includes upper and lower mounting blocks fixed on the housing (13). The positioning pin (601) is movably set in the hole on the upper and lower mounting blocks and can move in the hole. The hole on the upper and lower mounting blocks is also provided with a spring (602). When the cover mechanism is closed, the positioning pin (601) can be inserted into the hole on the cover rod (4) of the lower cover (2) under the push of the spring (602) to lock the cover mechanism. The positioning pin (601) is connected to the cab handle through the cable (603). When the cab handle is pulled, the positioning pin (601) retracts and releases the lock on the cover mechanism.

2. An emergency total static pressure sensor as described in claim 1, characterized in that, The bottom surface of the upper flip cover (1) has a groove, and the protrusion on the lower flip cover (2) can cooperate with the groove on the upper flip cover (1).

3. An emergency total static pressure sensor as described in claim 2, characterized in that, A recycling rod (7) is fixed to the outside of one of the cover rods (4) of the lower cover (2) and the upper cover (1). The recycling rod (7) passes through the recycling hole on the housing (13) and extends out of the housing (13).

4. An emergency total static pressure sensor as described in claim 3, characterized in that, It also includes a release locking mechanism (12), which includes a wedge block (1201) connected to the inner wall of the housing (13). A spring (1202) is provided between the wedge block (1201) and the housing (13). The wedge block (1201) and the housing (13) are connected by a protruding nut (1203). Pulling the protruding nut (1203) to the outside of the housing (13) can retract the wedge block (1201). When the total static pressure sensor (8) moves upward, the wedge block (1201) is released. When the total static pressure sensor (8) moves above the wedge block (1201), the wedge block (1201) pops out under the action of the spring force and locks the total static pressure sensor mounting base (9).

5. An emergency total static pressure sensor as described in claim 4, characterized in that, The guide post on the housing (13) extends into the hole on the wedge block (1201), and the wedge block (1201) can move along the guide post. The second spring (1202) is set on the guide post. The main body of the raised nut (1203) passes through the hole on the housing (13) and the wedge block (1201). The main body of the raised nut (1203) is connected to the screw at the end away from the housing (13). The outer diameter of the main body of the raised nut (1203) away from the wedge block (1201) is larger than the diameter of the hole on the housing (13) through which the main body of the raised nut (1203) passes. The thickness of the wedge block (1201) gradually increases from bottom to top. The side of the wedge block (1201) away from the inner wall of the housing (13) is an arc surface.

6. An emergency total static pressure sensor as described in claim 5, characterized in that, It also includes a push-out recovery mechanism, which pulls the total static pressure sensor (8) back into the housing (13) when it is necessary to retract the total static pressure sensor (8).

7. An emergency total static pressure sensor as described in claim 6, characterized in that, The launch and recovery mechanism includes a steel cable (16), one end of which is connected to the bottom surface of the total static pressure sensor mounting base (9), and the other end of which is fixed to a winch (15). The winch (15) is set on the housing (13). By rotating the winch (15), the steel cable (16) is wound around the winch (15), and the steel cable (16) can pull the total static pressure sensor (8) back into the housing (13).

8. An emergency total static pressure sensor as described in claim 7, characterized in that, A slide rail (11) is vertically installed on the inner wall of the housing (13), and the bearing (10) installed on the total static pressure sensor mounting base (9) can move along the slide rail (11).

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