Ram-wing parachute deployment load reduction system

Abstract

This invention discloses a ramjet parachute deployment and load reduction system, comprising a restraint ring, a sliding sheet (3), a release belt (4), a second connecting belt (5), a first connecting belt (6), a deceleration chute (7), a release mechanism (8), a load-bearing belt (9), and a restraint rope (10). This system can extend the ramjet parachute's inflation and deployment time. Compared to the current two-stage deployment method, it reduces the impact of the deceleration chute (7) on the ramjet parachute's gliding performance, and does not lose the deceleration chute (7). Compared to the current sliding sheet closing method, it has a better load reduction effect.

Description

Technical Field

[0001] This invention relates to ram-air parachutes, and more specifically to a ram-air parachute opening load reduction system. Background Technology

[0002] Ram-air parachutes are parachutes that inflate with ram air to form an wing-like shape. Their canopies are made of low-permeability materials, which can generate significant impact loads during high-speed deployment. To reduce this impact, the following methods are generally used:

[0003] 1) The sliding cloth is used to close the parachute, which uses the sliding cloth to constrain the parachute lines and gradually unfold them, thus allowing the parachute to unfold gradually. However, this method requires clarifying the matching relationship between the parachute and the sliding cloth. If the design is precise, it is quite complicated. If the design is not precise, the load reduction effect is poor.

[0004] 2) A two-stage deployment method is adopted, in which a deceleration chute is connected to the top of the ram-air canopy. The deceleration chute slows down the ram-air canopy in advance, allowing it to open at a safe deployment speed. However, in order to slow down the ram-air canopy to a safe deployment speed, a larger deceleration chute is required, which increases both cost and complexity. Moreover, due to the large area of ​​the deceleration chute, it usually detaches from the ram-air canopy, making it difficult to retrieve during high-altitude drop training, which adds extra cost. If it does not detach from the ram-air canopy, the large area of ​​the deceleration chute will drag on the top of the ram-air canopy, which will have a significant impact on the performance of the ram-air canopy. Summary of the Invention

[0005] The purpose of this invention is to provide a ram air glider opening load reduction system. This system can extend the ram air glider inflation and deployment time. Compared with the current two-stage opening method, it reduces the impact of the deceleration parachute (7) on the gliding performance of the ram air glider and does not lose the deceleration parachute (7). Compared with the current method of sliding fabric closing, it has a good load reduction effect.

[0006] The technical solution adopted in this invention is:

[0007] A ramjet parachute deployment and load reduction system includes constraint rings, a sliding cloth (3), a release belt (4), a second connecting belt (5), a first connecting belt (6), a deceleration chute (7), a release mechanism (8), a load-bearing belt (9), and constraint ropes (10). The constraint rings are distributed at the air chamber channels on both sides of the leading edge (1) and trailing edge (2) of the ramjet parachute. Four constraint ropes (10) correspond to the areas on both sides of the leading edge (1) and trailing edge (2) of the ramjet parachute, respectively. One end of the constraint rope (10) is fixed at the farthest end, and the other end passes through all the constraint rings in the corresponding area in sequence and then converges with the remaining constraint ropes (10) at the center of the top of the ramjet parachute. The converging end is connected to the lower end of the load-bearing belt (9); the deceleration parachute (7) is provided with two inner and outer rings of parachute ropes. The rope ends of the inner and outer rings of parachute ropes are respectively connected to the upper end of the relatively long connecting belt two (5) and the upper end of the relatively short connecting belt one (6). The lower end of the connecting belt two (5) is connected to the load-bearing belt (9). The lower end of the connecting belt one (6) is connected to the upper end of the load-bearing belt (9) through the release mechanism (8). One end of the release belt (4) is engaged with the release mechanism (8) through a pull pin, and the other end passes through the canopy of the stamped wing parachute and is connected to the sliding cloth (3). The sliding cloth (3) is slid on the parachute rope of the stamped wing parachute. When the pull pin is pulled out of the release mechanism (8), the connecting belt one (6) and the load-bearing belt (9) are separated.

[0008] Preferably, the release mechanism (8) adopts a three-ring release structure.

[0009] Preferably, the release band (4) passes through the center of the stamped wing parachute canopy and then connects to the center restraint band of the sliding cloth (3).

[0010] During operation: In the initial state, the sliding cloth (3) is located near the underside of the ram-air canopy and is loose. The release belt (4) and the load-bearing belt (9) are far from the top of the ram-air canopy. When the deceleration parachute (7) is fully inflated, the first connecting belt (6) is tightened and the second connecting belt (5) is loosened. The ram-air canopy opens and inflates. Since the outer ring of parachute lines supports the deceleration parachute (7), the resistance surface of the deceleration parachute (7) is relatively large. The four restraint ropes (10) pull the ram-air canopy canopy inward and restrain it. As the ram-air canopy continues to inflate, the restraint ropes (10) begin to move to both sides of the ram-air canopy, pulling down the load-bearing belt (9), the first connecting belt (6), and the deceleration parachute (7). Since the load-bearing belt (9) and the deceleration parachute (7) move down synchronously... As the connecting belt 2 (5) moves down but remains loose, the sliding cloth (3) slides away from the lower wing surface during inflation. When the ramjet parachute is about to fully unfold, the sliding cloth (3) slides down to the vicinity of the ramjet parachute rope end, causing the release belt (4) to pull out the release mechanism (8), and the connecting belt 1 (6) and the load-bearing belt (9) separate. When the ramjet parachute is fully unfolded and begins to glide, the connecting belt 2 (5) is tightened and subjected to force. Since the inner ring of parachute rope supports the deceleration parachute (7), the drag surface of the deceleration parachute (7) is small, and the deceleration parachute (7) has little impact on the gliding performance of the ramjet parachute. After the deceleration parachute (7) leaves the top of the ramjet parachute and is dragged to the trailing edge (2), the ramjet parachute is in a stable gliding state.

[0011] The beneficial effects of this invention are:

[0012] This system can extend the inflation and deployment time of the ram air glider, reduce the impact of the deceleration parachute (7) on the gliding performance of the ram air glider compared to the current two-stage opening method, and does not lose the deceleration parachute (7). Compared to the current method of closing the fabric, it has a good load reduction effect. Attached Figure Description

[0013] Figure 1 This is the initial state of the ram air canopy's opening and load reduction system in this embodiment of the invention, where the ram air canopy is not fully deployed.

[0014] Figure 2 yes Figure 1 Top view.

[0015] Figure 3 This is the stable state of the ram air wing parachute deployment and load reduction system in this embodiment of the invention, with the ram air wing parachute fully deployed.

[0016] Figure 4 This is a schematic diagram of the disengagement mechanism from two sides in an embodiment of the present invention.

[0017] In the diagram: 1-front edge; 2-rear edge; 3-sliding cloth; 4-release belt; 5-connecting belt two; 6-connecting belt one; 7-deceleration chute; 8-disengagement mechanism; 9-load-bearing belt; 10-restraint rope. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] This embodiment discloses a ram-wing parachute deployment load reduction system, such as... Figures 1 to 4 As shown: Includes constraint rings, sliding cloth 3, release belt 4, connecting belt two 5, connecting belt one 6, deceleration chute 7, release mechanism 8, load-bearing belt 9, and constraint ropes 10. The constraint rings are distributed at the air chamber channels on both sides of the leading edge 1 and trailing edge 2 of the ramjet parachute. Four constraint ropes 10 correspond to the areas on both sides of the leading edge 1 and trailing edge 2 of the ramjet parachute. One end of each constraint rope 10 is fixed at the furthest point, and the other end passes through all the constraint rings in its corresponding area before converging with the remaining constraint ropes 10 at the center of the top of the ramjet parachute. The converging end of the constraint ropes 10 is connected to... The lower end of the load-bearing belt 9; the deceleration parachute 7 is provided with two inner and outer rings of parachute ropes. The ends of the inner and outer rings of parachute ropes are respectively connected to the upper ends of the relatively longer connecting belt 2 5 and the relatively shorter connecting belt 1 6. The lower end of the connecting belt 2 5 is connected to the load-bearing belt 9. The lower end of the connecting belt 1 6 is connected to the upper end of the load-bearing belt 9 through the release mechanism 8. One end of the release belt 4 is engaged with the release mechanism 8 through a pull pin, and the other end passes through the canopy of the stamped wing parachute and is connected to the sliding cloth 3. The sliding cloth 3 is slidably fitted on the parachute ropes of the stamped wing parachute. When the pull pin is pulled out of the release mechanism 8, the connecting belt 1 6 and the load-bearing belt 9 are disengaged.

[0020] like Figure 4 As shown, in this embodiment, preferably, the release mechanism 8 adopts a three-ring release structure, which is relatively common, stable and reliable in release, and simple to operate.

[0021] like Figures 1 to 4 As shown, in this embodiment, preferably, the release belt 4 passes through the center of the stamped wing canopy and is connected to the center constraint belt of the sliding cloth 3; this setting allows the sliding cloth 3 to smoothly drive the release belt 4 when it slides down, avoiding excessive resistance.

[0022] During operation: In the initial state, such as Figure 1 and Figure 2 As shown, the sliding cloth 3 is located near the underside of the ram-air canopy and is loose. The release belt 4 and the load-bearing belt 9 are far from the top of the ram-air canopy. When the deceleration parachute 7 is fully inflated, the connecting belt 6 is tightened and the connecting belt 5 is loosened. The ram-air canopy opens and inflates. Since the outer ring of parachute lines supports the deceleration parachute 7, the drag surface of the deceleration parachute 7 is relatively large. The four restraint ropes 10 pull the ram-air canopy canopy inward and restrain it. As the ram-air canopy continues to inflate, the restraint ropes 10 begin to move to both sides of the ram-air canopy, pulling down the load-bearing belt 9, the connecting belt 6, and the deceleration parachute 7. Since the load-bearing belt 9 and the deceleration parachute 7 move down synchronously, the connecting belt 5 moves down accordingly but remains loose. The sliding cloth 3 is far from the top of the ram-air canopy during inflation. The parachute slides down from the lower wing surface; as the ramjet parachute is about to fully deploy, the sliding cloth 3 slides down to near the end of the ramjet parachute ropes, causing the release belt 4 to pull out the release mechanism 8 (by controlling the length of the restraint portion of the restraint rope 10, the size of the sliding cloth 3, and the initial position, the timing of "the sliding cloth 3 sliding down to near the end of the ramjet parachute ropes as the ramjet parachute is about to fully deploy" can be controlled; by controlling the length of the release belt 4, the timing of "the sliding cloth 3 sliding down to near the end of the ramjet parachute ropes, causing the release belt 4 to pull out the release mechanism 8" can be controlled), the connecting belt 6 and the load-bearing belt 9 disengage, and when the ramjet parachute is fully deployed and begins to glide, as... Figure 3 As shown, when the connecting belt 2 5 is stretched and stressed, since the inner ring of parachute lines supports the deceleration parachute 7, the drag surface of the deceleration parachute 7 is small, and the deceleration parachute 7 has little impact on the gliding performance of the ramjet parachute. After the deceleration parachute 7 leaves the top of the ramjet parachute and is dragged to the trailing edge 2, the ramjet parachute is in a stable gliding state.

[0023] This system can extend the inflation and deployment time of the ramjet parachute, reduce the impact of the drag chute 7 on the gliding performance of the ramjet parachute compared to the current two-stage deployment method, and does not lose the drag chute 7. Compared to the current method of sliding fabric closure, it has a good load reduction effect.

[0024] The embodiments described above are some, but not all, of the embodiments of this application. The detailed description of the embodiments of this application is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

Claims

1. A ram-wing parachute deployment load reduction system, characterized in that: The system includes a restraint ring, a sliding cloth (3), a release belt (4), a second connecting belt (5), a first connecting belt (6), a deceleration chute (7), a release mechanism (8), a load-bearing belt (9), and restraint ropes (10). The restraint rings are distributed at the air chamber passages on both sides of the leading edge (1) and trailing edge (2) of the ramjet parachute. The four restraint ropes (10) correspond to the areas on both sides of the leading edge (1) and trailing edge (2) of the ramjet parachute, respectively. One end of the restraint rope (10) is fixed at the farthest end, and the other end passes through all the restraint rings in the corresponding area in sequence and then converges with the remaining restraint ropes (10) at the center of the top of the ramjet parachute. The converged end of the restraint ropes (10) is connected to the load-bearing belt. The lower end of the belt (9); the deceleration parachute (7) is provided with two inner and outer rings of parachute ropes. The ends of the inner and outer rings of parachute ropes are respectively connected to the upper end of the relatively long connecting belt two (5) and the upper end of the relatively short connecting belt one (6). The lower end of the connecting belt two (5) is connected to the load-bearing belt (9). The lower end of the connecting belt one (6) is connected to the upper end of the load-bearing belt (9) through the release mechanism (8). One end of the release belt (4) is engaged with the release mechanism (8) through a pull pin, and the other end passes through the canopy of the stamped wing parachute and is connected to the sliding cloth (3). The sliding cloth (3) is slid on the parachute ropes of the stamped wing parachute. When the pull pin is pulled out of the release mechanism (8), the connecting belt one (6) and the load-bearing belt (9) are separated.

2. The ram-air parachute deployment load reduction system as described in claim 1, characterized in that: The release mechanism (8) adopts a three-ring release structure.

3. The ram-air parachute deployment load reduction system as described in claim 1, characterized in that: The release strap (4) passes through the center of the ram-wing parachute canopy and then connects to the center restraint strap of the sliding cloth (3).

4. The ram-air parachute deployment and load reduction system as described in any one of claims 1 to 3, characterized in that, During operation: In the initial state, the sliding cloth (3) is located near the underside of the ram-air canopy and is loose. The release belt (4) and the load-bearing belt (9) are far from the top of the ram-air canopy. When the deceleration parachute (7) is fully inflated, the first connecting belt (6) is tightened and the second connecting belt (5) is loosened. The ram-air canopy opens and inflates. Since the outer ring of parachute lines supports the deceleration parachute (7), the resistance surface of the deceleration parachute (7) is relatively large. The four restraint ropes (10) pull the ram-air canopy canopy inward and restrain it. As the ram-air canopy continues to inflate, the restraint ropes (10) begin to move to both sides of the ram-air canopy, pulling down the load-bearing belt (9), the first connecting belt (6), and the deceleration parachute (7). Since the load-bearing belt (9) and the deceleration parachute (7) move down synchronously... As the connecting belt 2 (5) moves down but remains loose, the sliding cloth (3) slides away from the lower wing surface during inflation. When the ramjet parachute is about to fully unfold, the sliding cloth (3) slides down to the vicinity of the ramjet parachute rope end, causing the release belt (4) to pull out the release mechanism (8), and the connecting belt 1 (6) and the load-bearing belt (9) separate. When the ramjet parachute is fully unfolded and begins to glide, the connecting belt 2 (5) is tightened and subjected to force. Since the inner ring of parachute rope supports the deceleration parachute (7), the drag surface of the deceleration parachute (7) is small, and the deceleration parachute (7) has little impact on the gliding performance of the ramjet parachute. After the deceleration parachute (7) leaves the top of the ramjet parachute and is dragged to the trailing edge (2), the ramjet parachute is in a stable gliding state.

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