A pneumatic shaping mechanism and a pop-up total pressure sensor

Abstract

The present invention discloses a pneumatic dimensional mechanism and a pop-up total pressure sensor. The mechanism comprises a dimensional baffle (21), an elastic torsion bar (22) and a wedge pin (23); the dimensional baffle (21) comprises a dimensional base plate (213), one end of the dimensional base plate (213) is provided with a lap ear piece (211), and the other end is provided with a hinge (212); the hinge (212) is connected to a total pressure probe hinge seat (121) at the root of a total pressure probe (12) of a pop-up total pressure sensor (1) via the elastic torsion bar (22); the rotation between the hinge (212), the elastic torsion bar (22) and the total pressure probe hinge seat (121) is limited by the wedge pin (23). The present invention can reduce the negative impact of the pop-up total pressure sensor, reduce the aerodynamic drag during the flight of a cruise missile, and improve stability.

Description

Technical Field

[0001] The invention belongs to a pneumatic shape-keeping mechanism, and in particular relates to a pneumatic shape-keeping mechanism and a pop-up total pressure sensor. Background Art

[0002] For cruise missiles, Mach number is a crucial parameter for closed-loop flight control. In engineering, it is obtained by measuring total and static atmospheric pressure. Based on the principle of total pressure measurement, the total pressure sensor must be protected from the influence of flow disturbances near the missile body, and the total pressure port must be located above the boundary layer. Due to launch conditions and stealth requirements, cruise missile total pressure sensors are often designed to be ejectable on command. They are folded and embedded within the missile body before launch, and eject upon command after launch.

[0003] Existing pop-up total pressure sensors lack dimensional design considerations. When deployed, they create a concave cavity on the missile's surface. During cruise missile flight, the oncoming airflow impacts this open cavity, distorting the flow field. This increases aerodynamic drag, reduces stability, and impacts the missile's overall performance. Summary of the Invention

[0004] The purpose of the present invention is to provide an aerodynamic shaping mechanism and a pop-up total pressure sensor. The present invention can reduce the negative impact of the pop-up total pressure sensor, reduce the aerodynamic drag during the flight of a cruise missile, and improve stability.

[0005] The technical solution of the present invention is: a pneumatic dimensional mechanism of a pop-up total pressure sensor, including a dimensional baffle, an elastic torsion bar and a wedge pin; the dimensional baffle includes a dimensional base plate, one end of the dimensional base plate is provided with a overlapping ear piece, and the other end is provided with a hinge; the hinge is connected to the total pressure probe hinge seat at the root of the total pressure probe of the pop-up total pressure sensor through the elastic torsion bar, and the rotation between the hinge, the elastic torsion bar and the total pressure probe hinge seat is limited by the wedge pin.

[0006] In the pneumatic dimensional mechanism of the aforementioned pop-up total pressure sensor, after the elastic torsion bar and the total pressure probe hinge are constrained by a wedge pin, the elastic torsion bar is rotated to a preset tightening angle of 6 to 12°, and then the wedge pin is used to constrain the elastic torsion bar and the hinge, thereby generating a pre-tightening torque to make the dimensional baffle close to the total pressure probe.

[0007] In the pneumatic shaping mechanism of the aforementioned pop-up total pressure sensor, the structure for generating pre-tightening torque is as follows: a hinge hole and a hinge seat hole are respectively provided on the hinge and the total pressure probe hinge seat, and both the hinge hole and the hinge seat hole have through holes in the radial direction; the elastic torsion bar is designed with pin holes, and the pin holes are distributed in two rows along the circumference of the torsion bar, one row of pin holes corresponds to the position of the through holes on the hinge hole, and the other row corresponds to the through holes on the hinge seat hole.

[0008] In the aforementioned pneumatic wedge mechanism of the pop-up total pressure sensor, the wedge angle of the pin hole is consistent with that of the wedge pin.

[0009] In the aforementioned pneumatic shaping mechanism of the pop-up total pressure sensor, the two ends of the elastic torsion bar are provided with torsion plates for rotating the elastic torsion bar. The material of the elastic torsion bar is 65Mn.

[0010] In the aforementioned pneumatic shaping mechanism of the pop-up total pressure sensor, the maximum torsion angle of the elastic torsion bar is greater than the sum of the pop-up angle of the total pressure probe and the preset compression angle.

[0011] A pop-up total pressure sensor comprises the aforementioned dimensional structure.

[0012] The aforementioned pop-up total pressure sensor also includes a total pressure sensor shell, which is fixedly connected to the aircraft shell; the shape-adjusting mechanism is hinged to the root of the total pressure probe through the cooperation of the hinge and the total pressure probe hinge seat; in normal state, the total pressure probe together with the shape-adjusting mechanism is locked in the pop-up cavity on the outer wall of the total pressure sensor shell through the pop-up actuator.

[0013] The advantages of the present invention are:

[0014] 1) When the total pressure probe pops out, the V-shaped mechanism can close the pop-up cavity, eliminating the negative impact of the pop-up cavity exposed after the total pressure probe pops out on the pneumatics;

[0015] 2) The V-shaped mechanism blocks the ejection cavity, which can achieve a certain sealing effect and greatly reduce the airflow entering the ejection cavity to the interior of the total pressure sensor, thus protecting the internal equipment.

[0016] 3) The reserved narrow space between the total pressure sensor housing and the total pressure probe is fully utilized, which occupies a small space and does not increase the overall size of the total pressure sensor. The overall structure of the original total pressure sensor is not changed, and the modification cost is low.

[0017] 4) Through the ingenious design of the mechanical structure, the dimensional mechanism closes the ejection cavity as the total pressure probe pops out, without the need for an additional driving mechanism. The dimensional mechanism has a simple structure and does not require additional electronic control, making it easy to control. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Installation and application diagram of pop-up total pressure sensor;

[0019] Figure 2 Schematic diagram of the installation and application of the dimensional mechanism;

[0020] Figure 3 Schematic diagram of the dimensional mechanism structure;

[0021] Figure 4 Schematic diagram of the dimensional baffle structure;

[0022] Figure 5 Schematic diagram of torsion bar structure;

[0023] Figure 6 Schematic diagram of the dimensional mechanism assembly;

[0024] Figure 7 Schematic diagram of the ejection process of the dimensional mechanism;

[0025] Figure 8 Schematic diagram of the shape-supporting mechanism popping into place. DETAILED DESCRIPTION

[0026] The present invention will be further described below with reference to the accompanying drawings and examples, but they are not intended to limit the present invention.

[0027] Example 1. Installation and application of the pop-up total pressure sensor 1 in an aircraft Figure 1 As shown, the total pressure sensor housing 11 is fixedly connected to the aircraft housing 0. The installation application of the dimensional mechanism 2 of the present invention on the pop-up total pressure sensor 1 is as follows: Figure 2 As shown, the dimensional mechanism 2 is hinged at the root of the total pressure probe. In normal state, the pop-up actuator 13 locks the total pressure probe 12 together with the dimensional mechanism 2 within the outer wall 111 of the total pressure sensor housing. The dimensional mechanism 2 consists of a dimensional baffle 21, an elastic torsion bar 22 and a wedge pin 23. The dimensional baffle 21 is hinged to the hinge seat 121 at the root of the total pressure probe 12 through the elastic torsion bar 22. The wedge pin 23 fixes the elastic torsion bar 22 to the dimensional baffle 21 and the hinge seat 121 of the total pressure probe 12 respectively, as shown in FIG. Figure 3 The dimensional baffle 21 includes a side ear piece 211, a hinge 212, and a dimensional base plate 213. The hinge 212 is provided with a hinge hole 2121, and the hinge hole 2121 is radially opened with a through hole 2122. Figure 4 As shown. The elastic torsion bar 22 is designed with pin holes 221 and torsion plates 222. The pin holes 221 are distributed in two rows along the circumference of the torsion bar. The wedge angle of the pin holes 221 is consistent with that of the wedge pin 23. Figure 5 shown.

[0028] Working principle:

[0029] When assembling the dimensional mechanism 2 and the total pressure probe 12, first align the hinge hole 2121 of the dimensional baffle 21 with the hinge seat 121 of the total pressure probe 12, insert the elastic torsion bar 22 into the hinge hole 2121 and the hinge seat 121, and then insert the wedge pin 23 through the through hole on the hinge seat 121 into the corresponding pin hole 221 on the elastic torsion bar 22 to achieve circumferential relative fixation of the elastic torsion bar 22 and the hinge seat 121. Finally, use a universal tool to rotate the torsion plates 222 on both sides of the elastic torsion bar 22 counterclockwise to align the other row of pin holes 221 on the elastic torsion bar 22 with the through holes 2122 on the dimensional baffle 21, and insert the wedge pin 23 to achieve circumferential relative fixation of the elastic torsion bar 22 and the hinge 212 on the dimensional baffle 21. The assembled dimensional mechanism is shown in FIG. Figure 6Because the torsion angle is preset by the wedge pin 23 when the elastic torsion bar 22 is installed, there is a pre-tightening torque that drives the hinge 212 to rotate clockwise. Under the action of the pre-tightening torque, the V-shaped baffle 21 is pressed against the total pressure probe 12.

[0030] In normal state, the shape-forming mechanism 2 together with the total pressure probe 12 is embedded in the outer wall 111 of the total pressure sensor housing under the action of the pop-up actuator 13, as shown in FIG. Figure 2 After receiving the ejection command from the aircraft, the ejection actuator 13 is activated, and the total pressure probe 12 and the dimensional mechanism 2 rotate outward around the ejection shaft 14 and eject until the edge ear 211 on the dimensional baffle 21 contacts the outer wall 111 of the total pressure sensor housing, as shown. Figure 7 As the total pressure probe 12 continues to pop out, the edge tab 211 of the dimensional baffle 21 is restrained by the outer wall 111 and cannot continue to pop out of the ejection cavity 1111. At the same time, the hinge 212 of the dimensional baffle 21, the elastic torsion bar 22, and the wedge pin 23 continue to rotate along with the hinge seat 121 at the base of the total pressure probe 12 until the total pressure probe 12 pops out into place and is locked by the stop block 15. During this process, since the end of the overlapping ear piece 211 of the dimensional baffle 21 is limited, the dimensional baffle 21 and the total pressure probe 12 are gradually separated, and the hinge 212 of the dimensional baffle 21 and the hinge seat 121 of the total pressure probe 12 rotate relative to each other. Under the action of the wedge pin 23, the torsion angle of the elastic torsion bar 22 is gradually increased, and the restoring torque generated is increased accordingly. The dimensional baffle 21 is limited at two points of the overlapping ear piece 211 and the hinge 212, and under the action of the restoring torque of the elastic torsion bar 22, it is kept in the position of the ejection cavity 1111, and then the ejection cavity 1111 is closed to achieve the dimensional shape, thereby preventing airflow from entering the ejection cavity 1111 into the projectile body. Figure 8 shown.

[0031] Example 2. The present invention mainly includes a dimensional baffle, a torsion bar and a wedge pin, wherein the dimensional baffle is the main functional component of the present invention. There are two overlapping ears on the dimensional baffle, which are responsible for realizing the limitation of the dimensional baffle. The dimensional baffle is installed at the root of the total pressure probe of the total pressure sensor through the torsion bar. The torsion bar is preset with a certain torque, and usually presses the dimensional baffle on the total pressure probe and buries it together in the total pressure sensor housing. When ordered to pop out, the dimensional baffle pops out together with the total pressure probe until the overlapping ears on the dimensional baffle contact the total pressure sensor housing and are limited. Under the action of the actuator, the total pressure probe overcomes the torsion bar torque and separates from the dimensional baffle. After the total pressure probe pops out and is locked in place, the torsion bar torque increases accordingly due to the increase in the angle between the dimensional baffle and the total pressure probe. Under the action of the torsion bar torque and the limitation of the overlapping ears, the dimensional baffle is fastened to the concave cavity formed after the total pressure probe pops out, blocking the concave cavity and realizing the dimensional shape.

[0032] The specific structure is as follows:

[0033] 1) The dimensional mechanism of the pop-up total pressure sensor mainly includes a dimensional baffle, a torsion bar and a wedge pin;

[0034] 2) The base of the dimensional baffle is designed with a hinge hole and the perimeter is designed with overlapping ears;

[0035] 3) A through hole is designed in the radial direction of the hinge hole at the root of the dimensional baffle;

[0036] 4) The maximum torsion angle of the torsion bar is greater than the sum of the ejection angle of the total pressure probe and the preset compression angle;

[0037] 5) The torsion bar is provided with pin holes in the longitudinal direction, which are divided into two rows;

[0038] 6) The circumferential angle between the two rows of pin holes on the torsion bar is the preset clamping angle.

[0039] 7) The pin hole on the torsion bar adopts a wedge-shaped design;

[0040] 8) The wedge angle of the wedge pin is consistent with the wedge angle of the pin hole on the torsion bar;

[0041] 9) The dimensional baffle is connected to the hinge seat at the root of the total pressure probe through a torsion bar;

[0042] 10) The wedge pins pass through the through holes on the hinge holes of the dimensional baffle and wedge into the pin holes in the corresponding row of the torsion bar, thereby fixing the torsion bar and the dimensional baffle circumferentially;

[0043] 11) The wedge pin passes through the through hole on the hinge seat at the root of the total pressure probe and wedges into the pin holes in the corresponding row of the torsion bar to fix the torsion bar and the total pressure probe circumferentially;

[0044] 12) In normal state, under the action of pre-tightening torque, the dimensional baffle is pressed against the total pressure probe and buried in the total pressure sensor housing along with the total pressure probe;

[0045] 13) When the total pressure probe is commanded to eject, the dimensional baffle also ejects. The overlapping tabs, as they pass through the ejection cavity, engage the outer wall of the total pressure sensor, restricting rotation. As the total pressure probe continues to eject, the torsion bar twists again, increasing torque. After the dimensional baffle is restrained by the overlapping tabs, it slides along the ejection cavity and reenters the cavity as the total pressure probe continues to eject.

[0046] 14) After the total pressure probe pops out into place, the torsion bar torque stops increasing, and the dimensional baffle is tightly fastened to the pop-out cavity under the action of the torsion bar and the limitation of the overlapping ears, thus achieving dimensional shape.

[0047] 15) The torsion bar torque ensures that the dimensional baffle can maintain a stable dimensional shape under the action of aerodynamic forces during flight.

Claims

1. A pneumatic shaping mechanism for a pop-up total pressure sensor, characterized in that: The invention comprises a dimensional baffle (21), an elastic torsion bar (22) and a wedge pin (23); the dimensional baffle (21) comprises a dimensional base plate (213), one end of the dimensional base plate (213) is provided with a lap ear piece (211), and the other end is provided with a hinge (212); the hinge (212) is connected to a total pressure probe hinge seat (121) at the root of a total pressure probe (12) of a pop-up total pressure sensor (1) via the elastic torsion bar (22), and the rotation between the hinge (212), the elastic torsion bar (22) and the total pressure probe hinge seat (121) is limited by the wedge pin (23).

2. The pneumatic shaping mechanism of the pop-up total pressure sensor according to claim 1, characterized in that: After the elastic torsion bar (22) and the total pressure probe hinge seat (121) are constrained by the wedge pin (23), the elastic torsion bar (22) is rotated to a preset clamping angle of 6 to 12 degrees, and the wedge pin (23) is then used to constrain the elastic torsion bar (22) and the hinge (212), thereby generating a pre-tightening torque, so that the dimensional baffle and the total pressure probe (12) are in contact.

3. The pneumatic shaping mechanism of the pop-up total pressure sensor according to claim 2, characterized in that: The structure for generating the pre-tightening torque is as follows: a hinge hole (2121) and a hinge seat hole are respectively provided on the hinge (212) and the total pressure probe hinge seat (121), and the hinge hole (2121) and the hinge seat hole are both radially provided with through holes (2122); the elastic torsion bar (22) is provided with pin holes (221), and the pin holes (221) are distributed in two rows along the circumference of the torsion bar, wherein one row of pin holes (221) corresponds to the position of the through holes (2122) on the hinge hole (2121), and the other row corresponds to the through holes (2122) on the hinge seat hole.

4. The pneumatic shaping mechanism of the pop-up total pressure sensor according to claim 3, characterized in that: The wedge angle of the pin hole (221) is consistent with that of the wedge pin (23).

5. The pneumatic shaping mechanism of the pop-up total pressure sensor according to claim 2, characterized in that: Torsion plates (222) are provided at both ends of the elastic torsion bar (22) for rotating the elastic torsion bar (22).

6. The pneumatic shaping mechanism of the pop-up total pressure sensor according to claim 2, characterized in that: The maximum torsion angle of the elastic torsion bar (22) is greater than the sum of the ejection angle of the total pressure probe (12) and the preset compression angle.

7. A pop-up total pressure sensor, characterized in that: It comprises the pneumatic shape-forming mechanism (2) as described in any one of claims 1 to 6.

8. The pop-up total pressure sensor according to claim 7, characterized in that: The invention comprises a total pressure sensor housing (11), wherein the total pressure sensor housing (11) is fixedly connected to an aircraft housing (0); a pneumatic shaping mechanism (2) is hinged to the root of the total pressure probe (12) through a hinge (212) and a total pressure probe hinge seat (121); in a normal state, the total pressure probe (12) and the pneumatic shaping mechanism (2) are locked in an ejection cavity (1111) on the outer wall (111) of the total pressure sensor housing through an ejection actuator (13).

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