Method for realizing stable step-by-step deployment of ram-air parachute and variable-size sliding cloth

Abstract

This invention discloses a method for achieving stable, step-by-step deployment of a ram-air parachute and a variable-size sliding fabric. The sliding fabric has rings at its four corners, and its central area is laterally contracted and folded, with restraint ropes restricting its lateral expansion. The rings at the four corners are connected by cross straps, and the center of each cross strap is connected to a breakaway rope via a connecting ring. The breakaway rope connects to the center of the parachute canopy. The restraint rope is disconnected by a separator with a delay function, which is activated by a pull-out rope. The pull-out rope connects to the center of the parachute canopy and is shorter than the breakaway rope, ensuring it straightens before the breakaway rope. The breakaway rope disconnects when the sliding fabric has deployed and slid down a certain distance. This invention enables stable, step-by-step deployment of the ram-air parachute, simplifying the design and finalization process.

Description

Technical Field

[0001] This invention relates to the opening control of ram-air parachutes, specifically to a method for achieving stable, step-by-step deployment of ram-air parachutes and a variable-size sliding cloth. Background Technology

[0002] Ram-air parachutes are wing-shaped parachutes that are inflated by ram air. Because they are made of materials with low permeability, their opening overload is generally more than 1.5 times that of conventional parachutes under high-speed opening conditions. Therefore, it is necessary to constrain their opening to make the ram-air parachute unfold gradually and avoid instantaneous full-area unfolding in order to ensure reliable opening.

[0003] Currently, a sliding fabric is generally used to control the gradual unfolding of ram-air parachutes. However, due to the complexity of the underlying mechanisms, it is difficult to control the matching of the sliding fabric and the size of the ram-air parachute. In addition, factors such as the size of the sliding fabric ring, the friction between the parachute rope and the ring, and the breathability of the main fabric of the sliding fabric also affect the opening of the parachute. Therefore, the effect of the sliding fabric during the opening process is often uncontrollable. Once the design is completed, its technical specifications cannot be changed. If the effect is not obvious, multiple tests are required to verify the effect of different specifications of sliding fabric, making the design finalization very troublesome. Summary of the Invention

[0004] The purpose of this invention is to provide a method for achieving stable, step-by-step deployment of a ram-air parachute, and a variable-size sliding fabric for achieving stable, step-by-step deployment of a ram-air parachute, which allows the ram-air parachute to deploy stably step-by-step, and simplifies the design and finalization process.

[0005] The technical solution adopted in this invention is: A method for achieving stable, step-by-step deployment of a ram-air parachute involves folding and contracting the middle section of the sliding fabric laterally and restricting its lateral expansion using restraint ropes. These restraint ropes are controlled to disconnect by a time-delay separator, which is activated by a pull cord. The pull cord is connected to the center of the canopy. Cross straps are used to connect the four corner loops of the sliding fabric, with a connecting ring at the center of the cross straps leading to a break cord. The break cord is then connected to the center of the canopy, ensuring it is longer than the pull cord. After the ram-air parachute begins to inflate, when the sliding fabric slides to a certain position, the pull cord straightens and activates the separator. The separator starts timing, and the sliding fabric continues to slide until the break cord straightens and stops, partially deploying the ram-air parachute and maintaining this position until the time delay ends. The separator then disconnects the restraint ropes, allowing the sliding fabric to expand laterally to both sides. Simultaneously, the increased lateral dimension grants the sliding fabric greater freedom of movement, allowing it to continue sliding. The ram-air parachute continues to expand, increasing the stress on the break cord until it breaks. The sliding fabric then slides to the bottom, and the ram-air parachute is fully inflated.

[0006] A variable-sized sliding fabric capable of stable, step-by-step deployment of a ram-air parachute. The sliding fabric has rings at its four corners, and the central area is laterally contracted and folded, with restraint ropes restricting its lateral deployment. The rings at the four corners of the sliding fabric are crisscrossed by cross straps, and the center of the cross straps is connected to a breakaway rope via a connecting ring. The breakaway rope is used to connect to the center of the parachute canopy. The restraint rope is disconnected by a separator with a time delay function. The separator is activated by a pull-out rope, which is used to connect to the center of the parachute canopy. The pull-out rope is shorter than the breakaway rope and ensures that it straightens before the breakaway rope. The breakaway rope can disconnect when the sliding fabric unfolds and slides down a certain distance.

[0007] Preferably, the middle area of ​​the sliding cloth is provided with sliding cloth restraint buckles, and the restraint rope passes through each sliding cloth restraint buckle to restrict the lateral expansion of the middle area of ​​the sliding cloth.

[0008] Preferably, the two ends of the restraint rope are knotted and tied together.

[0009] Preferably, the pull cord is connected to the center of the umbrella canopy via a canopy buckle.

[0010] Preferably, the hair tie is connected to the middle of the umbrella canopy via a buckle.

[0011] The beneficial effects of this invention are: This invention only requires controlling the length of the pull cord and the break cord, the delay time of the separator, and selecting the break range of the break cord to allow the sliding cloth to increase in size at the appropriate time, thereby allowing the ram-air parachute to unfold stably in stages, reducing the impact of instantaneous opening. The key is that the matching requirements between the sliding cloth and the ram-air parachute size are not high, and the design and finalization are simpler. Attached Figure Description

[0012] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the ram air canopy in an embodiment of the present invention when it begins to deploy and inflate, with the sliding fabric in a fully constrained state.

[0014] Figure 2 yes Figure 1 A schematic diagram of the fully constrained state of the sliding cloth.

[0015] Figure 3 This is a schematic diagram of the fabric unfolding in an embodiment of the present invention.

[0016] Figure 4 This is a schematic diagram of the rope breaking in an embodiment of the present invention, with the sliding cloth in a completely unconstrained state.

[0017] In the diagram: 1-Umbrella canopy; 2-Slippery fabric; 3-Break rope; 4-Hand rope; 5-Connecting ring; 6-Restraint rope; 7-Separator; 8-Ring; 9-Slippery fabric restraint buckle; 10-Umbrella canopy buckle. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. 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.

[0020] The features and performance of this application will be further described in detail below with reference to the embodiments.

[0021] Example 1 This embodiment discloses a method for achieving stable, step-by-step deployment of a ram-air parachute. The middle region of the sliding fabric 2 is laterally contracted and folded, and restraint ropes 6 are used to restrict the lateral deployment of this middle region. The restraint ropes 6 are disconnected by a separator 7 with a delay function. The separator 7 is activated by a pull rope 4, which is connected to the middle of the canopy 1. Cross straps are used to cross-connect the four corner rings 8 of the sliding fabric 2. The center of the cross straps is connected to a break rope 3 via a connecting ring 5. The break rope 3 is connected to the center of the canopy 1, ensuring that the break rope 3 is longer than the pull rope 4. The ram-air parachute begins to deploy. After inflation begins, when the sliding cloth 2 slides down to a certain position, the pull rope 4 straightens and the separator 7 is activated. The separator 7 starts counting down, and then the sliding cloth 2 continues to slide down until the pull rope 3 snaps and stops the sliding cloth 2. The ram air canopy partially unfolds and remains so until the delay ends. Then, the separator 7 disconnects the restraint rope 6, and the sliding cloth 2 unfolds to both sides laterally. At the same time, the sliding cloth 2 gains freedom of movement due to the increased lateral dimension and continues to slide down. The ram air canopy continues to unfold, and the pull rope 3 experiences increased force until the pull rope 3 breaks. Then, the sliding cloth 2 slides down to the bottom, and the ram air canopy is fully inflated.

[0022] Example 2 This embodiment discloses a variable-size sliding fabric capable of achieving stable, step-by-step deployment of a ram-air parachute, such as... Figure 2As shown: The four corners of the sliding fabric 2 are equipped with rings 8. The middle area is folded and contracted laterally and the lateral expansion of the middle area is restricted by the restraint rope 6. The rings 8 at the four corners of the sliding fabric 2 are connected by cross straps. The center of the cross straps is connected to the break rope 3 through the connecting ring 5. The break rope 3 is used to connect to the center of the canopy 1. The restraint rope 6 is controlled to disconnect by the separator 7 with a time delay function. The separator 7 is controlled to start by the pull rope 4. The pull rope 4 is used to connect to the middle of the canopy 1. The pull rope 4 is shorter than the break rope 3 and can ensure that it is straightened before the break rope 3. The break rope 3 can disconnect when the sliding fabric 2 is unfolded and slides down a certain distance.

[0023] After the ram-air parachute begins to inflate and deploy, see Figure 1 and Figure 2 When the sliding cloth 2 slides down to a certain position, the pull rope 4 straightens and activates the separator 7, which begins timing. The sliding cloth 2 then continues to slide down until the pull rope 3 snaps, straightens, and stops the sliding cloth 2. The ram-air parachute section unfolds and remains in place until the delay ends. Subsequently, the separator 7 disconnects the restraint rope 6, and the sliding cloth 2 unfolds laterally to both sides. Figure 3 Meanwhile, the sliding cloth 2 gains freedom of movement due to the increased lateral dimension and continues to slide down, the ram-air parachute continues to deploy, and the tension on the snap rope 3 increases until the snap rope 3 breaks. (See...) Figure 4 Then the slide cloth 2 slides down to the bottom, and the rammed parachute is fully inflated.

[0024] like Figure 2 As shown, in this embodiment, preferably, a sliding cloth constraint buckle 9 is provided around the middle area of ​​the sliding cloth 2, and a constraint rope 6 passes through each sliding cloth constraint buckle 9 to restrict the lateral expansion of the middle area of ​​the sliding cloth 2.

[0025] like Figure 2 As shown, in this embodiment, preferably, the two ends of the constraint rope 6 are knotted and tied together.

[0026] like Figure 2 As shown, in this embodiment, preferably, the pull cord 3 is connected to the center of the umbrella canopy 1 through the umbrella canopy buckle 10.

[0027] like Figure 2 As shown, in this embodiment, preferably, the hair tie 4 is connected to the middle of the umbrella 1 via the umbrella 10 buckle.

[0028] This invention only requires controlling the lengths of the pull cord 4 and the break cord 3, the delay time of the separator 7, and selecting the breaking range of the break cord 3 to allow the sliding cloth 2 to increase in size at the appropriate time, thereby allowing the ram-air parachute to unfold stably step by step, reducing the impact of instantaneous opening. The key point is that the matching requirements between the sliding cloth 2 and the ram-air parachute size are not high, and the design is simpler.

[0029] 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 method of enabling stable stepwise deployment of a ram-air parachute, characterized by: The middle section of the sliding fabric is folded and contracted laterally, and restraint ropes are used to restrict its lateral expansion. The restraint ropes are disconnected by a separator with a time delay function. The separator is activated by a pull rope, which is connected to the middle of the canopy. Cross straps are used to cross the loops at the four corners of the sliding fabric. The center of the cross straps is connected to the break rope through a connecting ring. The break rope is connected to the center of the canopy, ensuring that the break rope is longer than the pull rope. After the ram-air parachute begins to expand and inflate, when the sliding fabric slides down to a certain position, the pull rope straightens and the separator is activated. The separator starts counting down, and the sliding fabric continues to slide down until the break rope straightens and stops the sliding fabric. The ram-air parachute partially expands and remains so until the time delay ends. Then, the separator disconnects the restraint ropes, and the sliding fabric expands laterally to both sides. At the same time, the sliding fabric gains freedom of movement due to the increased lateral dimension and continues to slide down. The ram-air parachute continues to expand, and the force on the break rope increases until the break rope breaks. Then, the sliding fabric slides down to the bottom, and the ram-air parachute is fully inflated.

2. A variable size slider for enabling a parachute to be steadily deployed in stages by ram air, characterised in that: To achieve the method for stable, step-by-step deployment of a ram-air parachute as described in claim 1, the four corners of the sliding fabric are provided with rings, the middle area is laterally contracted and folded, and the lateral deployment of the middle area is restricted by constraint ropes. The rings at the four corners of the sliding fabric are cross-connected by cross straps, and the center of the cross straps is connected to a break rope through a connecting ring. The break rope is used to connect to the center of the parachute canopy. The constraint rope is controlled to disconnect by a separator with a time delay function. The separator is activated by a pull rope. The pull rope is used to connect to the middle of the parachute canopy. The pull rope is shorter than the break rope and can ensure that it is straightened before the break rope. The break rope can disconnect when the sliding fabric is deployed and slides down a certain distance.

3. The variable size canopy of claim 2, wherein: The middle area of ​​the sliding cloth is equipped with sliding cloth restraint buckles, and the restraint ropes are looped through each sliding cloth restraint buckle to restrict the lateral expansion of the middle area of ​​the sliding cloth.

4. The variable-size sliding fabric capable of stable, step-by-step deployment of a stamped parachute as described in claim 2, characterized in that: Tie a knot at the point where the two ends of the restraint rope meet.

5. The variable-size sliding fabric as described in claim 2, capable of achieving stable, step-by-step deployment of a stamped parachute, characterized in that: The pull cord is connected to the center of the canopy via the canopy buckle.

6. The variable-size sliding fabric as described in claim 2, capable of achieving stable, step-by-step deployment of a stamped parachute, is characterized in that: The hair tie is connected to the middle of the umbrella canopy via a buckle.

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