An autonomous delayed parachute opening system

Abstract

The present invention discloses an autonomous delayed parachute opening system, which includes a parachute compartment, a main parachute unit, a main parachute bag, a guide parachute unit, a delayed cutter and a restraining mechanism, wherein the parachute compartment has a receiving slot, the upper end of which is open; the main parachute unit includes a main parachute, which is arranged in the receiving slot, and the lower end of the main parachute is fixed to the parachute compartment; the main parachute bag is arranged in the receiving slot, and the lower end of the main parachute bag is fixedly connected to the upper end of the main parachute to restrain the main parachute in the receiving slot; the guide parachute unit includes a guide parachute. The beneficial effects of the present invention are: in the case where there is no physical connection between the carrier aircraft and the parachute / airdrop payload, the guide parachute can realize autonomous recognition of the departure signal and autonomous start of the delay, and can be applied to airdrop scenarios where physical connection cannot be provided, and has strong versatility.

Description

Technical Field

[0001] The invention relates to the technical field of parachute opening, and in particular to an autonomous delayed opening system. Background Art

[0002] In some cases of airdropping using aircraft, some parachutes are large in area and may affect the carrier aircraft if deployed immediately after leaving the aircraft, causing flight unsafe factors. Therefore, it is required that the parachute should be opened only after leaving the aircraft at a certain safe distance, which is the so-called delayed parachute opening.

[0003] Traditional delayed parachute opening systems (such as an airdrop accessory delayed parachute opening mechanism disclosed in application number 201110191844.5) generally use a mechanical pull-to-start delay component. Since the delay component cannot be started autonomously, there must be a physical connection between the carrier aircraft and the parachute / airdrop payload to provide a departure signal for the parachute. It is not suitable for airdrop scenarios where physical connection cannot be provided (such as delivery through a standard buoy launch tube). Summary of the invention

[0004] The purpose of the present invention is to overcome the above-mentioned technical deficiencies and propose an autonomous delayed parachute opening system to solve the technical problem that the traditional delayed parachute opening system in the prior art is not suitable for airdrop scenarios that cannot provide physical cross-linking because it cannot autonomously start the delay component.

[0005] In order to achieve the above technical objectives, the technical solution of the present invention provides an autonomous delayed parachute opening system, comprising:

[0006] The parachute compartment has a receiving groove, and the upper end of the receiving groove is open;

[0007] A main parachute unit, comprising a main parachute, wherein the main parachute is disposed in the receiving slot, and a lower end of the main parachute is fixed to the parachute compartment;

[0008] A main parachute bag, the main parachute bag is arranged in the receiving slot, the lower end of the main parachute bag is fixedly connected to the upper end of the main parachute, so as to constrain the main parachute in the receiving slot;

[0009] A guide parachute unit, comprising a guide parachute, the lower end of which is fixedly connected to the upper end of the main parachute bag;

[0010] A delayed cutter, the firing pin of which is fixedly connected to the lower end of the guide parachute;

[0011] A restraint mechanism comprises at least three restraint belt assemblies and a fixing rope, each of the restraint belt assemblies being axially arranged on the side of the main parachute pack, and one end of each of the restraint belt assemblies being fixed on the parachute compartment, and the fixing rope slidingly passing through the other end of each of the restraint belt assemblies, the rope threading hole of the delay cutter and the lower end of the guide parachute and closing to restrain the main parachute pack in the accommodating groove.

[0012] Furthermore, the accommodating groove is a columnar structure.

[0013] Furthermore, the main parachute unit also includes a first lifting strap, one end of which is fixedly connected to the upper end of the main parachute, and the other end of which is fixedly connected to the lower end of the main parachute bag.

[0014] Furthermore, the main parachute bag is a columnar structure, and the main parachute bag has a cavity, the lower end of the cavity is open and is used to accommodate the main parachute unit, and the cavity is a columnar structure.

[0015] Furthermore, the area of ​​the guide parachute is smaller than the area of ​​the main parachute.

[0016] Furthermore, the guide parachute unit also includes a second lifting strap, one end of which is fixedly connected to the lower end of the guide parachute, and the other end of which is fixedly connected to the upper end of the main parachute bag.

[0017] Furthermore, the guide umbrella unit also includes a third lifting belt, one end of which is fixedly connected to the lower end of the guide umbrella, and one end of which is fixedly connected to the firing pin of the delay cutter.

[0018] Furthermore, the guide parachute unit also includes at least three connecting belt assemblies, one end of each of the connecting belt assemblies is fixedly connected to the lower end of the guide parachute, and the fixing rope slides through the other end of each of the connecting belt assemblies.

[0019] Furthermore, the restraint belt assembly includes a restraint belt and a first connecting ring, one end of the restraint belt is fixed on the parachute cabin, the first connecting ring is fixed to the other end of the restraint belt, the connecting belt assembly includes a connecting belt and a second connecting ring, one end of the connecting belt is fixedly connected to the lower end of the guide parachute, the second connecting ring is fixed to the other end of the connecting belt, the fixing rope slides through each of the first connecting rings and each of the second connecting rings, and each of the second connecting rings is distributed in a ring structure.

[0020] Furthermore, from the start of the delay timing of the delayed cutter until the fixing rope is not cut by the delayed cutter, the second lifting belt is in a relaxed state.

[0021] Compared with the prior art, the beneficial effects of the present invention include: during airdrop, the entire autonomous delayed parachute opening system is dropped from the carrier aircraft with the airdrop load, the autonomous delayed parachute opening system enters the airflow, the unconstrained guide parachute is fully opened under the action of the airflow and generates aerodynamic force, and the aerodynamic force is transmitted to the firing pin on the delayed cutter, so that the firing pin on the delayed cutter is pulled out, and the delayed cutter starts the delay timing. At this time, the aerodynamic force of the guide parachute acts on the fixing rope, and acts on the restraint belt assembly through the fixing rope, thereby acting on the parachute cabin, and the main parachute bag is not subjected to the upward pulling force. When the delay time is reached, the cutter in the delay cutter cuts the fixing rope, and the fixing rope slides out from the lower end of the restraint belt assembly and the guide parachute under the upward pulling action of the guide parachute, thereby releasing the constraint on the main parachute pack. The guide parachute pulls out the main parachute pack, and the main parachute pack pulls the main parachute into the airflow. The main parachute is fully inflated and the airdrop payload is decelerated. In the absence of physical connection between the carrier aircraft and the parachute / airdrop payload, the guide parachute can autonomously identify the departure signal and autonomously start the delay. It is suitable for airdrop scenarios where physical connection cannot be provided and has strong versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of an autonomous delayed parachute opening system provided by the present invention;

[0023] Figure 2 yes Figure 1 A schematic diagram of the structure of a main parachute of an autonomous delayed parachute opening system after being pulled out;

[0024] In the figure: 100-parachute compartment, 110-accommodation slot, 200-main parachute unit, 210-main parachute, 220-first lifting strap, 300-main parachute bag, 310-cavity, 400-guide parachute unit, 410-guide parachute, 420-second lifting strap, 430-third lifting strap, 440-connecting strap assembly, 441-connecting strap, 442-second connecting ring, 500-delay cutter, 600-restraint mechanism, 610-restraint strap assembly, 611-restraint strap, 612-first connecting ring, 620-fixing rope, 700-parachute cover. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0026] The present invention provides an autonomous delayed parachute opening system, the structure of which is as follows: Figure 1 and Figure 2As shown, it includes a parachute compartment 100, a main parachute unit 200, a main parachute bag 300, a guide parachute unit 400, a delayed cutter 500 and a restraint mechanism 600, wherein the parachute compartment 100 has a receiving slot 110, and the upper end of the receiving slot 110 is open; the main parachute unit 200 includes a main parachute 210, the main parachute 210 is arranged in the receiving slot 110, and the lower end of the main parachute 210 is fixed to the parachute compartment 100; the main parachute bag 300 is arranged in the receiving slot 110, and the lower end of the main parachute bag 300 is fixedly connected to the upper end of the main parachute 210, so as to restrain the main parachute 210 in the receiving slot 110; the guide parachute unit 400 bag The invention comprises a guide parachute 410, the lower end of which is fixedly connected to the upper end of the main parachute bag 300; the firing pin of the delay cutter 500 is fixedly connected to the lower end of the guide parachute 410; the restraint mechanism 600 comprises at least three restraint belt assemblies 610 and a fixing rope 620, each of which is axially arranged on the side of the main parachute bag 300, and one end of each of the restraint belt assemblies 610 is fixed to the parachute cabin 100, and the fixing rope 620 slides through the other end of each of the restraint belt assemblies 610, the rope threading hole of the delay cutter 500 and the lower end of the guide parachute 410 and is closed to restrain the main parachute bag 300 in the accommodating groove 110.

[0027] During airdrop, the entire autonomous delayed parachute opening system is dropped from the carrier aircraft with the airdrop payload, and the autonomous delayed parachute opening system enters the airflow. The guide parachute 410, which is free of any constraints, is fully opened and generates aerodynamic force under the action of the airflow, and the aerodynamic force is transmitted to the firing pin on the delayed cutter 500, thereby pulling out the firing pin on the delayed cutter 500, and the delayed cutter 500 starts the delay timing. At this time, the aerodynamic force of the guide parachute 410 acts on the fixing rope 620, and acts on the restraint belt assembly 610 through the fixing rope 620, thereby acting on the parachute cabin 100, and the main parachute bag 300 is not subjected to the upward pulling force. When the delay time is reached, the delayed cutter 500 The 500-li cutter cuts the fixing rope 620, and the fixing rope 620 slides out from the lower ends of the restraint belt assembly 610 and the guide parachute 410 under the upward pulling action of the guide parachute 410, thereby releasing the constraint on the main parachute bag 300, and the guide parachute 410 pulls out the main parachute bag 300, and the main parachute bag 300 pulls the main parachute 210 into the airflow, and the main parachute 210 is fully inflated to decelerate the airdrop load. In the absence of physical connection between the carrier aircraft and the parachute / airdrop load, the guide parachute 410 can realize autonomous recognition of the departure signal and autonomous start of the delay, which is applicable to airdrop scenarios where physical connection cannot be provided, and has strong versatility.

[0028] As a preferred embodiment, please refer to Figure 1 The receiving groove 110 is a columnar structure, so that the main parachute bag 300 can be arranged in the receiving groove 110.

[0029] As a preferred embodiment, please refer to Figure 2 The main parachute unit 200 also includes a first lifting strap 220, one end of which is fixedly connected to the upper end of the main parachute 210, and the other end of which is fixedly connected to the lower end of the main parachute bag 300. When the constraint of the main parachute bag 300 is released, the main parachute bag 300 is pulled out by the aerodynamic force of the guide parachute 410, and the main parachute 210 is pulled into the airflow through the first lifting strap 220.

[0030] As a preferred embodiment, please refer to Figure 1 and Figure 2 The main parachute bag 300 is a columnar structure, which is convenient for axially arranging each of the restraint belt assemblies 610 on the side of the main parachute bag 300, so that the restraint belt assembly 610 can best restrain the main parachute bag 300 and prevent the main parachute bag 300 from being squeezed out from the gap between adjacent restraint belt assemblies 610. The main parachute bag 300 has a cavity 310, and the lower end of the cavity 310 is open to accommodate the main parachute unit 200. The cavity 310 is a columnar structure to prevent the main parachute 210 from entering the airflow from the side due to the effect of the airflow during the airdrop process. The upper end of the main parachute 210 is fixedly connected to the top of the cavity 310.

[0031] As a preferred embodiment, please refer to Figure 2 The area of ​​the guide parachute 410 is smaller than that of the main parachute 210. Since the guide parachute 410 is unconstrained and is deployed immediately after leaving the aircraft, the aerodynamic force generated pulls the firing pin of the delay cutter 500 as a starting signal for the departure delay. In order to ensure that the guide parachute 410 does not have any safety problems when leaving the aircraft, the area of ​​the guide parachute 410 should be reduced as much as possible.

[0032] As a preferred embodiment, in order to reduce the area of ​​the guide parachute 410, the following method can be adopted. Since the function of the guide parachute 410 is to provide a pull-out force for the firing pin of the delay cutter 500, the selection of the delay cutter 500 with a small pull-out force is the basis for reducing the area of ​​the guide parachute 410. According to the parachute aerodynamic formula , under the condition of release force 10N~15N, low release speed, guide parachute 410 resistance characteristic C S A S Not exceeding 0.124㎡.

[0033] As a preferred embodiment, in order to further reduce the area of ​​the guide parachute 410, a large drag coefficient C should be selected. S The guide parachute 410 has a simple structure and a drag coefficient C S For a square umbrella with an average value of 0.9, the size of the guide umbrella 410 is only 0.14 m2.

[0034] As a preferred embodiment, please refer to Figure 1 and Figure 2 The guide parachute unit 400 also includes a second lifting strap 420, one end of which is fixedly connected to the lower end of the guide parachute 410, and the other end of which is fixedly connected to the upper end of the main parachute bag 300, and the main parachute bag 300 is pulled by the second lifting strap 420.

[0035] As a preferred embodiment, please refer to Figure 1 The guide parachute unit 400 also includes a third lifting belt 430, one end of which is fixedly connected to the lower end of the guide parachute 410, and one end of which is fixedly connected to the firing pin of the delay cutter 500, and the aerodynamic force of the guide parachute 410 is transmitted to the firing pin on the delay cutter 500 through the third lifting belt 430.

[0036] As a preferred embodiment, please refer to Figure 1 The guide parachute unit 400 also includes at least three connecting belt assemblies 440, one end of each connecting belt assembly 440 is fixedly connected to the lower end of the guide parachute 410, the fixing rope 620 slides through the other end of each connecting belt assembly 440, so that the fixing rope 620 slides through the lower end of the guide parachute 410, the delay cutter 500 starts the delay timing, and the aerodynamic force of the guide parachute 410 acts on the fixing rope 620 through the connecting belt assembly 440, and acts on the restraint belt assembly 610 through the fixing rope 620, thereby acting on the parachute cabin 100.

[0037] As a preferred embodiment, please refer to Figure 1The restraint belt assembly 610 includes a restraint belt 611 and a first connecting ring 612, one end of the restraint belt 611 is fixed to the parachute cabin 100, and the first connecting ring 612 is fixed to the other end of the restraint belt 611. The connecting belt assembly 440 includes a connecting belt 441 and a second connecting ring 442, one end of the connecting belt 441 is fixedly connected to the lower end of the guide parachute 410, and the second connecting ring 442 is fixed to the other end of the connecting belt 441. The fixing rope 620 slides through each of the first connecting rings 612 and each of the second connecting rings 442, and each of the second connecting rings 442 is distributed in a ring structure, thereby realizing the sliding connection between the fixing rope 620 and each of the restraint belt assemblies 610 and each of the connecting belt assemblies 440.

[0038] As a preferred embodiment, please refer to Figure 1 From the start of the delay timing of the delayed cutter 500 to the time before the fixing rope 620 is cut by the delayed cutter 500, the second lifting belt 420 is in a relaxed state, thereby preventing the guide parachute 410 from directly lifting the main parachute bag 300 during this period, and further increasing the reliability of the restraint mechanism 600 on the main parachute bag 300.

[0039] As a preferred embodiment, please refer to Figure 1 The autonomous delayed parachute opening system also includes an umbrella cover 700, which is covered on the parachute cabin 100 and is used to close the receiving groove 110. The bottom of the umbrella cover 700 is fixedly connected to the top of the guide parachute 410. When the entire autonomous delayed parachute opening system is not airdropped, the guide parachute 410 can also be located in the receiving groove 110.

[0040] As a preferred embodiment, the delay cutter 500 is a prior art (refer to a pull-type delay cutter disclosed in application number 200820031221.5). The delay cutter 500 is a mechanical pull-type fire-operated component with a rope threading hole. The internal delay is activated by pulling its own firing pin. When the delay time is reached, the cutter is pushed to cut the rope-like material in the rope threading hole.

[0041] In order to better understand the present invention, the following Figure 1 and Figure 2 The working principle of the technical solution of the present invention is described in detail:

[0042] During airdrop, the entire autonomous delayed parachute opening system is dropped from the carrier aircraft with the airdrop payload, and the autonomous delayed parachute opening system enters the airflow. The guide parachute 410 without any constraints is fully opened and generates aerodynamic force under the action of the airflow, and the aerodynamic force is transmitted to the firing pin on the delayed cutter 500 through the third lifting belt 430, so that the firing pin on the delayed cutter 500 is pulled out, and the delayed cutter 500 starts delay timing. At this time, the aerodynamic force of the guide parachute 410 acts on the fixing rope 620 through each of the connecting belt assemblies 440, and acts on the restraining belt assembly 610 through the fixing rope 620, thereby acting on the parachute cabin 100. Since the second lifting belt 420 is in a relaxed state during the period from the start of the delay timing of the delayed cutter 500 to the time before the fixing rope 620 is not cut by the delayed cutter 500, the main parachute bag 300 is not subjected to the upward pulling force, thereby avoiding the guide parachute 41 0 directly pulls up the main parachute bag 300, further increasing the reliability of the constraint mechanism 600 for the main parachute bag 300. When the delay time is reached, the cutter in the delay cutter 500 cuts off the fixing rope 620. The fixing rope 620 slides out from each of the first connecting rings 612 and each of the second connecting rings 442 under the upward pulling action of each of the connecting belt assemblies 440, thereby releasing the constraint on the main parachute bag 300. The guide parachute 410 pulls out the main parachute bag 300 through the second lifting belt 420. The main parachute bag 300 then pulls the main parachute 210 into the airflow through the first lifting belt 220. The main parachute 210 is fully inflated to decelerate the airdrop load. In the absence of physical connection between the carrier aircraft and the parachute / airdrop load, the guide parachute 410 can realize autonomous recognition of the departure signal and autonomous start of the delay. The guide parachute 410 is applicable to airdrop scenarios where physical connection cannot be provided, and has strong versatility.

[0043] The autonomous delayed parachute opening system provided by the present invention has the following beneficial effects:

[0044] (1) From the start of the delay timing of the delay cutter 500 to the time before the fixing rope 620 is cut by the delay cutter 500, the second lifting belt 420 is in a relaxed state, so as to prevent the guide parachute 410 from directly lifting the main parachute bag 300 during this period, thereby further increasing the reliability of the restraint mechanism 600 restraining the main parachute bag 300;

[0045] (2) The main parachute bag 300 containing the main parachute 210 is formed into a cage-like restraint structure through the restraint belt assembly 610 and the fixing rope 620, so as to ensure that the main parachute 210 does not work after leaving the aircraft, and realize the delayed parachute opening of the autonomous delayed parachute opening system and the airdropped payload after reaching a safe distance from the carrier aircraft;

[0046] (3) The autonomous delayed parachute opening system disclosed in the present invention can autonomously identify the departure signal and autonomously start the delay through the guide parachute 410 when there is no physical connection between the carrier aircraft and the parachute / airdrop payload. It can be applied to airdrop scenarios where physical connection cannot be provided. It has strong versatility, simple product structure, low cost, high reliability, and is applicable to various types of aerial delivery. There is no restriction on the parachute type of the main parachute 210.

[0047] The specific implementation of the present invention described above does not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. An autonomous delayed parachute opening system, characterized in that: include: The parachute compartment has a receiving groove, and the upper end of the receiving groove is open; A main parachute unit, comprising a main parachute, wherein the main parachute is disposed in the receiving slot, and a lower end of the main parachute is fixed to the parachute compartment; A main parachute bag, the main parachute bag is arranged in the receiving slot, the lower end of the main parachute bag is fixedly connected to the upper end of the main parachute, so as to constrain the main parachute in the receiving slot; A guide parachute unit, comprising a guide parachute, the lower end of which is fixedly connected to the upper end of the main parachute bag; A delayed cutter, the firing pin of which is fixedly connected to the lower end of the guide parachute; A restraint mechanism, comprising at least three restraint belt assemblies and a fixing rope, each of the restraint belt assemblies being axially arranged on the side of the main parachute bag, and one end of each of the restraint belt assemblies being fixed to the parachute compartment, and the fixing rope slidingly passing through the other end of each of the restraint belt assemblies, the rope threading hole of the delay cutter and the lower end of the guide parachute and closing, so as to restrain the main parachute bag in the accommodating groove; The main parachute unit further includes a first lifting strap, one end of which is fixedly connected to the upper end of the main parachute, and the other end of which is fixedly connected to the lower end of the main parachute bag; The guide parachute unit further comprises a second lifting strap, one end of which is fixedly connected to the lower end of the guide parachute, and the other end of which is fixedly connected to the upper end of the main parachute bag; The guide umbrella unit further comprises a third lifting belt, one end of which is fixedly connected to the lower end of the guide umbrella, and one end of which is fixedly connected to the firing pin of the delay cutter; The guide parachute unit further comprises at least three connecting belt assemblies, one end of each connecting belt assembly is fixedly connected to the lower end of the guide parachute, and the fixing rope slides through the other end of each connecting belt assembly; The restraint belt assembly includes a restraint belt and a first connecting ring, one end of the restraint belt is fixed on the parachute cabin, and the first connecting ring is fixed to the other end of the restraint belt. The connecting belt assembly includes a connecting belt and a second connecting ring, one end of the connecting belt is fixedly connected to the lower end of the guide parachute, and the second connecting ring is fixed to the other end of the connecting belt. The fixing rope slides through each of the first connecting rings and each of the second connecting rings, and each of the second connecting rings is distributed in a ring structure.

2. The autonomous delayed parachute opening system according to claim 1, characterized in that: The main parachute bag is a columnar structure, and has a cavity. The lower end of the cavity is open and is used to accommodate the main parachute unit. The cavity is a columnar structure.

3. The autonomous delayed parachute opening system according to claim 2, characterized in that: The area of ​​the guide parachute is smaller than that of the main parachute.

4. The autonomous delayed parachute opening system according to claim 1, characterized in that: From the start of the delay timing of the delay cutter until the fixing rope is not cut by the delay cutter, the second lifting belt is in a relaxed state.

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