Method for improving parachute opening performance of large ram-type parafoil

Abstract

The invention discloses a method for improving the parachute opening performance of a large ram parafoil, and the method comprises the steps: carrying out the folding constraint of air chambers at two sides, carrying out the folding constraint of rear edge parachute cords at two sides of a rear edge, and enabling the air chambers at the same side to be combined with the constraint structures on the rear edge parachute cords, thereby improving the parachute opening performance of the large ram parafoil. When the air chambers on the two sides are inflated to a certain degree, the air chambers on the two sides and the parachute cords on the rear edge can gradually release constraint at the same time; in the initial stage of parachute opening, the middle air chamber begins to inflate, the rear edge parachute cord is in a stressed and tensioned state due to the fact that the extending part is restrained, and therefore the rear edge parachute cord is prevented from being wound, the two side air chambers start to inflate after the middle air chamber is inflated and expanded to be full, and when the two side air chambers are inflated to a certain degree, the two side air chambers and the rear edge parachute cord are gradually released and restrained at the same time. The air chambers on the two sides are gradually unfolded, and the parachute cords on the rear edges on the two sides are gradually stretched till the parachute canopy is inflated and fully expanded. The method can effectively prevent the rear edge parachute cord from being wound around the top in the initial parachute opening stage of the large ram-type parafoil, and meanwhile, the parachute opening impact force generated instantaneously is reduced.

Description

Technical Field

[0001] The invention relates to a ram wing parachute, and in particular to a method for improving the opening performance of a large ram wing parachute. Background Art

[0002] The ram wing parachute is inflated by ram air to form an airfoil shape. It relies on different lengths of parachute ropes to increase in length from the leading edge to the trailing edge along the chord direction to maintain a specific installation angle, thereby controlling the inflation angle of attack after deployment, so as to achieve a balance between lift and drag after stable inflation and deployment, thereby obtaining excellent gliding performance.

[0003] For small parafoils, the chord length is short, so the number of parafoil lines distributed along the chord is small, and the difference in the length of the parafoil lines from the leading edge to the trailing edge is not too large. However, as the area of ​​the ram wing parafoil increases, the density of the parafoil lines distributed along the chord will not only increase, but also the length difference between the parafoil lines will become larger and larger, especially between the leading and trailing edge parafoil lines. Sometimes the length difference can reach more than several meters, which presents a big problem: During the opening process of a large ram wing parachute, the shorter the parachute ropes are, the earlier they will be stressed and straightened. However, for a ram wing parachute whose canopy is still in a bunch, the trailing edge parachute ropes that are several meters long are basically in a relaxed state at the moment of opening. In the disordered opening process, they swing around at will, and with a high probability they will always be entangled in the incompletely unfolded canopy of the large ram wing parachute or on other parachute ropes. Once entangled, it is basically impossible for a large ram wing parachute to be fully inflated by itself, which will cause system failure. At the very least, the canopy will be damaged, the parachute ropes will break, and the system cannot be controlled when partially inflated, resulting in an uncontrolled fall. At worst, the canopy cannot be unfolded, and the system is basically in a free fall state and crashes directly.

[0004] Based on the above reasons, some methods of restraining the overgrown parachute ropes are currently used in the packaging process of large-scale ram wing parachutes. For example, the excess parachute ropes are folded in a Z shape and then restrained to the end of the parachute ropes using fixed ropes or elastic ropes. However, in this way, the parachute ropes that are restrained at the moment of opening the parachute will be directly pulled out instantly under the action of airflow, and the above problems will still occur, because the excess parachute ropes bundled in a ball are also in a relaxed state at the moment of being pulled out, and the above problems cannot be completely solved. Summary of the invention

[0005] The object of the present invention is to provide a method for improving the opening performance of a large ram wing parachute, which can effectively prevent the trailing edge parachute rope from being entangled around the top of the large ram wing parachute in the initial stage of opening, and at the same time reduce the instantaneous opening impact force.

[0006] The technical solution adopted by the present invention is: A method for improving the opening performance of a large ram wing parachute comprises the following steps: folding and restraining air chambers on both sides, folding and restraining the trailing edge parachute ropes growing on both sides of the trailing edge, and combining the restraining structures on the air chambers and the trailing edge parachute ropes on the same side, so that when the air chambers on both sides are inflated to a certain degree, the air chambers on both sides and the trailing edge parachute ropes can be gradually released from restraint at the same time; at the initial stage of opening the parachute, the middle air chamber begins to be inflated, and the trailing edge parachute ropes are in a tensioned state due to the restraint of the growing parts, thereby avoiding the entanglement of the trailing edge parachute ropes, and after the middle air chamber is fully inflated, the air chambers on both sides begin to be inflated, and when the air chambers on both sides are inflated to a certain degree, the air chambers on both sides and the trailing edge parachute ropes are gradually released from restraint at the same time, the air chambers on both sides are gradually unfolded, and the trailing edge parachute ropes on both sides are gradually extended until the parachute canopy is fully inflated.

[0007] Preferably, the common limiting structure of the air chamber and the trailing edge parachute rope includes a limiting ring, a rope sleeve, a constraint rope 1, a constraint rope 2, a fixing rope and a limiting hook. The limiting rings are distributed on the leading edge and both sides of the air chamber gathering area on the lower wing surface. The rope sleeve is arranged near the trailing edge of the air chamber gathering area on the lower wing surface and corresponds one-to-one to the folded trailing edge parachute ropes. Both ends of the constraint rope 1 are connected to the fixing rope to form a ring around the air chamber gathering area. The fixing rope passes through the limiting ring at the leading edge, and the constraint rope 1 passes through the limiting rings on both sides in turn and forms a connecting section near the rope sleeve. After the trailing edge parachute rope is folded in half, it passes through the corresponding rope sleeve and is fixed to the connecting section of the constraint rope 1 through the constraint rope 2. The limiting hooks are distributed on both side sections of the constraint rope 1. The limiting hook can pass through the limiting ring when moving toward the trailing edge and is blocked by the limiting ring when moving to the leading edge.

[0008] Preferably, the limiting hook is a V-shaped elastic metal piece, with its opening facing the front edge and its tip facing the rear edge.

[0009] Preferably, the limiting rings are distributed on both sides of the air chamber folding area according to the position of the parachute ropes from the chord of the wing parachute, and the distribution spacing of the limiting hooks on both sides of the air chamber folding area is the distribution spacing of the parachute ropes from the chord of the wing parachute.

[0010] Preferably, the cinch cord sleeve is sewn onto the lower wing surface.

[0011] Preferably, the air chambers on both sides are contracted and compressed in the form of accordion bellows.

[0012] Preferably, the trailing edge parachute line is folded in half in an area below the trailing edge cord lock.

[0013] The beneficial effects of the present invention are: The method can effectively prevent the trailing edge parachute rope from being entangled around the top of the large ram wing parachute in the initial stage of opening, and allows the parachute canopy to be deployed a second time to extend the opening time, that is, simultaneously reducing the instantaneous opening impact force. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the state of the umbrella in the initial stage of opening of the present invention.

[0015] Figure 2 It is a schematic diagram of the common limiting structure of the air chamber and the trailing edge parachute rope in the present invention.

[0016] Figure 3 It is a schematic diagram of the present invention after being fully inflated.

[0017] In the figure: 1. Leading edge; 2. Trailing edge; 3. Lower wing surface; 4. Constraint rope 1; 5. Rope loop; 6. Trailing edge parachute rope; 7. Limiting ring; 8. Limiting hook; 9. Constraint rope 2; 10. Trailing edge rope buckle; 11. Stabilizing rope; 12. U-shaped ring. DETAILED DESCRIPTION

[0018] The application will be further described below in conjunction with the accompanying drawings and embodiments.

[0019] The present application discloses a method for improving the opening performance of a large-scale ram wing parachute, the primary purpose of which is to prevent the trailing edge parachute rope 6 from being entangled around the top in the initial stage of opening the large-scale ram wing parachute. The principle is as follows: the air chambers on both sides are gathered and constrained, the trailing edge parachute ropes 6 growing on both sides of the trailing edge 2 are folded in half and constrained, and the constraint structures on the air chambers and the trailing edge parachute ropes 6 on the same side are combined, so that when the air chambers on both sides are inflated to a certain extent, the air chambers on both sides and the trailing edge parachute ropes 6 can be gradually released from constraints at the same time; at the initial stage of opening the parachute, the middle air chamber begins to be inflated, and the trailing edge parachute ropes 6 are in a tensioned state due to the growth of the constrained part, thereby preventing the trailing edge parachute ropes 6 from being entangled, and after the middle air chamber is fully inflated, the air chambers on both sides begin to be inflated, and when the air chambers on both sides are inflated to a certain extent, the air chambers on both sides and the trailing edge parachute ropes 6 are gradually released from constraints at the same time, the air chambers on both sides are gradually unfolded, and the trailing edge parachute ropes 6 on both sides are gradually extended until the parachute canopy is fully inflated. The method can effectively prevent the trailing edge parachute rope 6 from being entangled around the top in the initial stage of opening the large ram wing parachute, and allows the parachute canopy to be deployed for a second time to extend the opening time, that is, simultaneously reducing the instantaneous opening impact force.

[0020] According to the above scheme, the common limiting structure of the air chamber and the trailing edge parachute rope 6 is the key to the present application. In this embodiment, preferably: Figure 2 As shown, the common limiting structure of the air chamber and the trailing edge parachute rope 6 includes a limiting ring 7, a rope tie 5, a restraining rope 1 4, a restraining rope 2 9, a fixed force rope 11 and a limiting hook 8. The limiting ring 7 is distributed on the leading edge 1 and both sides of the air chamber folding area on the lower wing surface 3. The rope tie 5 is arranged near the trailing edge 2 of the air chamber folding area on the lower wing surface 3 and corresponds to the folded trailing edge parachute rope 6 one by one. The two ends of the restraining rope 1 4 are connected to the fixed force rope 11 to form a ring around the air chamber folding area. The fixed force rope 11 passes through the limiting ring 7 on the leading edge 1. The restraining rope 1 4 passes through the limiting rings 7 on both sides in turn and forms a connecting section near the rope tie 5. After the trailing edge parachute rope 6 is folded in half, it passes through the corresponding rope tie 5 and is fixed to the connecting section of the restraining rope 1 4 through the restraining rope 2 9. The limiting hooks 8 are distributed on both side sections of the restraining rope 1 4. The limiting hooks 8 can pass through the limiting ring 7 when moving toward the trailing edge 2 and are blocked by the limiting ring 7 when moving to the leading edge 1. In the initial stage of parachute opening, as Figure 1 As shown, due to the mooring of the restraint rope 4 and the fixing rope 11, the air chamber folding area is in a restricted state, and only the middle air chamber begins to inflate. The trailing edge parachute rope 6 is constrained in a tensioned state due to the extended part, thereby preventing the trailing edge parachute rope 6 from being entangled. At the same time, the trailing edge 2 is also pulled down. After the middle air chamber is fully inflated, the air chambers on both sides begin to inflate, and the tension on the fixing rope 11 begins to gradually increase. When the air chambers on both sides are inflated to a certain extent, the fixing ropes 11 on both sides break, and the air chambers on both sides and the trailing edge parachute rope 6 release the constraints at the same time. Thereafter, the trailing edge 2 pulls down the trailing edge parachute rope 6 to gradually stretch it, and the trailing edge parachute rope 6 pulls the limiting hook 8 on the constraint rope 4 through the limiting ring 7 in turn and moves toward the trailing edge 2. At the same time, the air chambers on both sides gradually unfold, as shown in FIG. Figure 3 As shown, until the canopy is fully inflated, the sliding cloth then slides down steadily to the upper end of the U-shaped ring 12 and begins to glide stably.

[0021] According to the common limiting structure of the air chamber and the trailing edge parachute rope 6, in this embodiment, preferably, as Figure 2 As shown: the limit hook 8 is a V-shaped elastic metal part, with its opening facing the leading edge 1 and the tip facing the trailing edge 2; the limit rings 7 are distributed on both sides of the air chamber gathering area according to the position of the parachute chord to the parachute rope, and the distribution spacing of the limit hooks 8 on both sides of the air chamber gathering area is the distribution spacing of the parachute chord to the parachute rope; the rope sleeve 5 is sewn on the lower wing surface 3; the air chambers on both sides are gathered and compressed in the form of accordion bellows; the trailing edge parachute rope 6 is folded in half in the area below the trailing edge rope buckle 10.

[0022] The embodiments described above are part of the embodiments of the present application, rather than all of the embodiments. The detailed description of the embodiments of the present application is not intended to limit the scope of the present application for protection, but merely represents the selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

Claims

1. A method for improving the opening performance of a large ram wing parachute, characterized in that: The air chambers on both sides are retracted and constrained, the trailing edge parachute ropes growing on both sides of the trailing edge are folded in half and constrained, and the constraint structures on the air chambers and the trailing edge parachute ropes on the same side are combined, so that when the air chambers on both sides are inflated to a certain degree, the air chambers on both sides and the trailing edge parachute ropes can gradually release the constraints at the same time; in the initial stage of opening the parachute, the middle air chamber begins to inflate, and the trailing edge parachute ropes are constrained to be in a tensioned state due to the growing parts, thereby avoiding the entanglement of the trailing edge parachute ropes. After the middle air chamber is fully inflated, the air chambers on both sides begin to inflate. When the air chambers on both sides are inflated to a certain degree, the air chambers on both sides and the trailing edge parachute ropes are gradually released at the same time, the air chambers on both sides gradually unfold, and the trailing edge parachute ropes on both sides gradually stretch until the parachute canopy is fully inflated.

2. The method for improving the opening performance of a large ram wing parachute according to claim 1, characterized in that: The common limiting structure of the air chamber and the trailing edge parachute rope includes a limiting ring, a rope sleeve, a constraint rope 1, a constraint rope 2, a fixed force rope and a limiting hook. The limiting rings are distributed on the leading edge and both sides of the air chamber gathering area on the lower wing surface. The rope sleeve is arranged near the trailing edge of the air chamber gathering area on the lower wing surface and corresponds one to one with the folded trailing edge parachute rope. The two ends of the constraint rope 1 are connected to the fixed force rope to form a ring around the air chamber gathering area. The fixed force rope passes through the limiting ring at the leading edge, and the constraint rope 1 passes through the limiting rings on both sides in turn and forms a connecting section near the rope sleeve. After the trailing edge parachute rope is folded in half, it passes through the corresponding rope sleeve and is fixed to the connecting section of the constraint rope 1 through the constraint rope 2. The limiting hooks are distributed on both side sections of the constraint rope 1. The limiting hook can pass through the limiting ring when moving toward the trailing edge and is blocked by the limiting ring when moving to the leading edge.

3. The method for improving the opening performance of a large ram wing parachute according to claim 2, characterized in that: The limiting hook adopts a V-shaped elastic metal piece, the opening of which faces the front edge and the tip faces the rear edge.

4. The method for improving the opening performance of a large ram wing parachute according to claim 2, characterized in that: The limiting rings are distributed on both sides of the air chamber folding area according to the position of the parachute chord to the parachute rope, and the distribution spacing of the limiting hooks on both sides of the air chamber folding area is the distribution spacing of the parachute chord to the parachute rope.

5. The method for improving the opening performance of a large ram wing parachute according to claim 2, characterized in that: The cinch cord sleeve is sewn to the lower wing surface.

6. The method for improving the opening performance of a large ram wing parachute according to any one of claims 1 to 5, characterized in that: The air chambers on both sides are gathered and compressed in the form of accordion bellows.

7. The method for improving the opening performance of a large ram wing parachute according to any one of claims 1 to 5, characterized in that: The trailing line is folded in half below the trailing line lock.

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