CN113799983A - Multilayer air bag type air-drop buffering device - Google Patents
Multilayer air bag type air-drop buffering device Download PDFInfo
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- CN113799983A CN113799983A CN202111258939.4A CN202111258939A CN113799983A CN 113799983 A CN113799983 A CN 113799983A CN 202111258939 A CN202111258939 A CN 202111258939A CN 113799983 A CN113799983 A CN 113799983A
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- 230000003139 buffering effect Effects 0.000 title description 11
- 239000010410 layer Substances 0.000 claims abstract description 91
- 239000002344 surface layer Substances 0.000 claims abstract description 13
- 238000009423 ventilation Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 abstract description 26
- 230000000694 effects Effects 0.000 abstract description 6
- 230000007306 turnover Effects 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 6
- 238000007906 compression Methods 0.000 description 5
- 239000006260 foam Substances 0.000 description 5
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- 210000001015 abdomen Anatomy 0.000 description 2
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- 235000013305 food Nutrition 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- B64D1/00—Dropping, ejecting, releasing, or receiving articles, liquids, or the like, in flight
- B64D1/02—Dropping, ejecting, or releasing articles
- B64D1/08—Dropping, ejecting, or releasing articles the articles being load-carrying devices
- B64D1/14—Absorbing landing shocks
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Abstract
The invention belongs to the technical field of buffer design, and discloses a multilayer air bag type air-drop buffer device which comprises a multilayer air bag positioned below a drop container; the multilayer airbag includes: a bottom layer air bag, a middle layer air bag and a surface layer air bag; the lower end of the bottom layer air bag is provided with an air bag opening; a vent hole is arranged between every two adjacent layers of air bags; the upper end of the surface layer air bag is closed. After the bottom layer air bag is pressed, the air is filled into the surface layer air bag upwards, so that the air pressure in the buffer device can be quickly and effectively reduced along with the landing process, the buffer device cannot rebound, and the throwing container cannot turn over; the one-way air hole is formed between the upper layer air bag and the lower layer air bag of the buffer device, gas filled into the bottom layer air bag in the landing process cannot escape outwards, an air cushion can be kept between the throwing container and the ground in the whole buffer process, the buffer effect can be achieved in the whole process, and soft landing is achieved.
Description
Technical Field
The invention belongs to the technical field of buffer design, and relates to a multilayer air bag type air-drop buffer device.
Background
The airdrop of the goods and materials plays an extremely important role in supporting frontline and border area battles and rescuing and disaster relief for natural disasters. The required air-drop materials comprise a plurality of fragile foods, medicaments and the like, and are easily damaged due to landing impact, so that the effective utilization rate of the air-drop materials is low, and the air-drop efficiency is weakened or even the air-drop task fails. Therefore, an effective landing buffer must be reliably adopted in the airdrop task. In the existing parachute landing air-drop system, an air bag type or energy-absorbing foam type buffer device is mostly adopted in the landing process.
The traditional air bag type buffer devices are single-layer air bags, are quickly inflated through a compressed air bottle or other gas generating devices before landing, and provide buffer for a throwing container after touching the ground. However, most of the traditional buffer air bags are closed, and the phenomenon of rebound can occur like a leather ball after the air is compressed to a certain pressure in the landing process. In the rebound process, certain overload can be transmitted to impact the throwing container; on the other hand, the rebound posture is difficult to stabilize, and particularly when the landing is performed on a not-smooth ground, the rebound is very easy to cause the dropping container to overturn and even roll, so that the contained materials are seriously damaged. Currently, some airbags have limited modifications, and air vents are provided in the side of the airbag. In the compression process of the air bag, air is discharged outwards through the air escape holes, and the pressure of the air bag is continuously reduced, so that the air bag is not easy to rebound due to overlarge pressure. However, the problem that all gas is exhausted when the throwing container is continuously dropped and compressed occurs in the air bag, and finally the throwing container still directly touches the ground, so that the soft landing cannot be really realized.
The energy-absorbing foam-type cushioning device is sequentially collapsed from bottom to top in the landing process, and the cushioning effect of the energy-absorbing foam-type cushioning device depends on the thickness of the foam layer. However, the required thickness is related to the actual application environment, and it is difficult to accurately design the thickness of the foam layer in advance. The thinness of the foam layer tends to result in cushioning failure, which in turn makes the overall cushioning device cumbersome. On the other hand, the foam fragments dispersed in the buffering process easily pollute the throwing container and the contents, and are not beneficial to taking by ground personnel.
Disclosure of Invention
The invention aims to provide a multilayer air bag type buffer device which can slowly absorb energy, does not pollute redundant materials and really realizes 'soft landing' of an air-drop container.
The utility model provides a multilayer gasbag formula air-drop buffer which characterized in that: the device comprises a multilayer air bag positioned below the throwing container;
the multilayer airbag includes: a bottom layer air bag, a middle layer air bag and a surface layer air bag;
every two adjacent layers of the multilayer air bags are fixedly connected, and a vent hole is arranged between the two adjacent layers of the multilayer air bags;
the lower end of the bottom layer air bag is provided with an air bag opening for inflating the air bag when the air bag descends;
the upper end of the surface layer air bag is closed.
Furthermore, each layer of air bag is uniformly divided into a plurality of air chambers; and free air holes are arranged between every two adjacent air chambers of each layer. Generally, the area of each buffer air bag is large, and the stability of the air bag can be enhanced by separating a plurality of air chambers; moreover, the upper and lower bag skins of each layer of air bag are connected by the plurality of vertically and horizontally intersected air chamber walls, so that the connection points of the upper and lower bag skins can be increased, the air bag is not bulged in the middle after being inflated, and the flatness of the inflated surface of the air bag can be kept. Free air holes are arranged between every two adjacent air chambers, so that air between every two adjacent air chambers can freely circulate, and the whole air pressure of each layer of air bag is kept consistent.
Furthermore, the number of the air chambers separated by each layer of air bag is the same, and the upper air chamber and the lower air chamber are aligned;
an air pocket opening is formed below each air chamber of the bottom air bag;
and vent holes are arranged between the air chambers of every two adjacent layers of air bags.
The upper and lower air chambers adopt an alignment design to keep the overall stability of the multi-layer air bag after inflation and expansion. The bottom gasbag is the windward layer at the in-process that descends after throwing in, through set up the pocket wind gap in every air chamber below of bottom gasbag, under the effect of descending relative velocity, impresses the convection current air into the bottom gasbag, aerifys for the gasbag. And a vent hole is arranged between every two adjacent layers of air bags, and air can circulate between the air bags of all layers, so that the pressure inside the whole multi-layer air bag is consistent.
Further, the air pocket opening is a one-way air inlet hole; the vent holes are unidirectional air holes, and the direction of the air holes is unidirectional upward. The air inlet of the bottom air bag and the vent hole between every two adjacent air bags are arranged in a single direction, so that air can only flow from the lower layer to the upper layer, the air pressed into the air inlet of the bottom air bag in the descending process can not reversely escape, and an air cushion always exists between the air inlet of the air-drop container and the ground in the landing process.
Furthermore, the one-way air hole is a pressure limiting air hole and is opened when the pressure difference between two ends of the air hole exceeds a pressure threshold value. The one-way air hole sets an initial ventilation pressure threshold value, so that each layer of air bag is inflated upwards after being compressed to a certain degree in the landing process, and the buffering and speed reduction are realized through air compression.
Further, the pressure limiting air hole is used for primary pressure limiting; the pressure threshold is 1.25 times atmospheric pressure;
when the pressure difference between the two ends of the air hole exceeds a pressure threshold value, the pressure limiting air hole is opened;
once the pressure limiting air hole is opened, the ventilation pressure limiting is invalid, and then the air can be freely ventilated upwards in a one-way mode.
The pressure limiting air hole has the function that each layer of air bag is compressed to a certain degree in the landing process so as to realize buffering and deceleration, but the pressure threshold value cannot be too large, otherwise, the rebound phenomenon still occurs. Setting the pressure threshold at 1.25 atm, i.e., 20% compression of each layer of bladder, provides some resistance to compression. When the compression is continued, the pressure exceeds the pressure threshold, the pressure limiting air hole is opened, the lower layer air can be inflated upwards freely, the pressure stability of the lower layer air bag is maintained, the upper layer and the lower layer are consistent in pressure finally, and the rebound problem is effectively avoided.
Further, the air pocket opening is in a horn shape with a downward opening. The air inlet area is large, and the air inlet efficiency is high.
Further, the ratio of the diameter of the opening at the lower end of the air pocket port to the diameter of the opening at the upper end is not less than 8. The diameter of the lower end opening and the upper end opening of the air pocket port are arranged in proportion to form a windward pressure air passage. The opening at the upper end is reduced, so that the flow speed of the gas pressed into the air bag is increased, a local low-pressure area is formed, and the high-pressure gas with the opening at the lower end continuously flows into the low-pressure area at the opening at the upper end, so that the air suction effect is realized.
Advantageous effects
1) The bottom layer air bag is provided with an air pocket opening, so that the air bag can be inflated automatically in the landing process, a high-pressure gas bottle does not need to be carried, and the complexity of the buffer device is reduced;
2) in the landing process, after the bottom layer air bag is pressurized, the air is upwards filled into the middle layer air bag and the surface layer air bag in sequence, compressed air can be quickly released to the upper layer air bag, the whole air pressure of the buffer device is effectively reduced, the buffer device cannot rebound, and a throwing container cannot turn over;
3) the air inlet of the bottom layer air bag of the buffering device and the vent holes between the upper layer air bag and the lower layer air bag are arranged in a one-way mode, gas filled into the bottom layer air bag in the landing process can be released upwards only in the inner portion and cannot escape outwards, the fact that an air cushion is kept between the releasing container and the ground in the whole buffering process can be guaranteed, the buffering effect can be achieved in the whole process, and soft landing is achieved.
Drawings
FIG. 1 is a schematic view of a multi-layer air bag type air-drop cushioning device;
FIG. 2 is a schematic view of the installation of the buffer device and the throwing container;
FIG. 3 is a schematic diagram of the operation of the buffer device during the release process;
FIG. 4 is a schematic view illustrating a landing process of the buffering device;
1-buffer device, 2-throwing container, 3-parachute, 11-bottom airbag, 12-middle airbag, 13-surface airbag, 14-one-way air hole, 15-air pocket opening and 16-air.
Detailed Description
The invention mainly provides a technical scheme of a multilayer air bag type buffer device. Taking a 3-layer airbag as an example, as shown in fig. 1, the cushion device 1 includes a three-layer airbag including a bottom airbag 11, a middle airbag 12, and a surface airbag 13. The upper end of the surface layer air bag 13 is closed and is fixedly connected with the air-drop container 2. The lower end of the bottom layer air bag 11 is provided with an air pocket opening 15, and the air pocket opening collects air to inflate the bottom layer air bag 11 in the adjusting and landing process of the air drop container. Each layer of air bag is equally divided into a plurality of air chambers, free air holes are arranged between the adjacent air chambers of each layer of air bag, and the air chambers of the upper layer of air bag and the lower layer of air bag are aligned. A one-way air hole 14 allowing upward ventilation is arranged between the corresponding air chambers of the upper and lower adjacent layers of air bags. The one-way vent 14 can set a certain pressure threshold, and after the pressure of the lower layer airbag exceeds the set value, the one-way vent 14 will open and become a free vent, and the gas will be rapidly filled into the upper layer airbag through the one-way vent 14.
1) The cushioning device comprises a plurality of layers of stacked air bags;
2) each layer of air bag of the buffer device is divided into a plurality of air chambers, and free air holes are arranged between the adjacent air chambers of each layer of air bag;
3) each air chamber of the bottom air bag is provided with a horn-shaped air inlet with a large lower part and a small upper part, and the air bag can automatically intake air and inflate without an air bottle or other devices;
4) the air chambers of the upper and lower air bags are aligned, and a one-way air hole is arranged between each air chamber of every two adjacent air bags;
5) the one-way air hole can set ventilation pressure, when the pressure of the lower layer air bag exceeds the set pressure, the one-way air hole is opened, and air can be filled into the upper layer air bag;
6) the buffer device is arranged at the belly of the container, and is quickly inflated after being airdropped from the carrier;
7) in the landing process of the buffer device, compressed gas is sequentially filled into the surface layer air bag from the bottom layer air bag, and when the pressure is balanced, the throwing container is decelerated to stop;
8) the air vent between the air pocket opening and the air bags on the upper layer and the lower layer are upward one-way air holes, and in the whole buffering process, air in the buffering device does not escape outwards, so that an air cushion can be kept all the time, and soft landing is realized.
Taking the buffer device of 3 layers of air bags as an example, the buffer device 1 is arranged at the belly of the throwing container 2, and the 3 layers of air bags of the buffer device 1 are in a contracted folded state when being installed, so that the occupied space is saved, and a single transport plane can be used for loading more materials.
The working principle is as follows:
after the airplane arrives at a preset throwing place, the throwing container 2 is thrown together with the buffer device 1 and the parachute 3 to leave the airplane, and the parachute 3 is in a parachute bag state at the moment. In the descending process, the pocket wind gap 15 on the bottom airbag 11 in the buffer device 1 is inflated against the wind, and through the design of the horn mouths with the large lower part and the small upper part, the upper end opening of the pocket wind gap 15 can form a high-speed low-pressure air flow area, so that the external air is continuously sucked, the bottom airbag 11 is pressed in, and the bottom airbag 11 is enabled to be full. When the pressure in the bottom airbag 11 is equal to the external pressure, the air inlet 15 is not inflated to the bottom airbag 11 due to the unidirectional arrangement.
After the parachute is landed to the parachute opening height, the parachute 3 is opened, and the throwing container is rapidly decelerated. When the air resistance of the parachute is balanced with the gravity of the drop container at a certain speed, the drop container is lowered at a substantially constant speed until landing, typically about 6 m/s.
At the moment of touchdown, the lower surface of the bottom airbag 11 is immediately stationary. The dropping speed of the throwing container 2 is kept to continuously drop under the inertia effect, and the air in the bottom layer air bag 11 is compressed due to the unidirectional ventilation of the air pocket opening. During the continued descent of the dispensing container 2, the air in the bottom airbag 11 is continuously compressed. When the volume of the bottom airbag 11 is compressed to about 0.8 times, the internal air pressure reaches the set 1.25 times of the air pressure, and at the moment, the air pressure in the bottom airbag 11 breaks through the pressure limitation of the one-way air hole 14, so that the pressure-limiting one-way air hole 14 is changed into a free one-way air hole, and the compressed air in the bottom airbag 11 is rapidly extruded into the middle airbag 12. With the dropping container 2 continuing to drop, the compressed air in the bottom layer air bag 11 is continuously filled into the middle layer air bag 12, the pressure of the middle layer air bag 12 also reaches the set pressure limiting value of the one-way air hole 14 between the middle layer air bag 12 and the surface layer air bag 13, and the compressed air 16 is squeezed into the surface layer air bag 13. And so on for more layers of the airbag. In the process, the throwing container 2 is decelerated continuously, and the compressed air 16 is filled into the middle layer air bag 12 and the surface layer air bag 13, so that the pressure of the compressed air in the buffer device 1 can be continuously relieved, the air in the whole buffer device 1 is maintained not to rebound due to overhigh pressure, the kinetic energy impact of the falling of the throwing container 2 is effectively buffered, the pressure is slowly reduced to be balanced with the gravity of the throwing container 2, and the throwing container 2 is enabled to land safely and stably.
Claims (8)
1. The utility model provides a multilayer gasbag formula air-drop buffer which characterized in that: the device comprises a multilayer air bag positioned below the throwing container;
the multilayer airbag includes: a bottom layer air bag, a middle layer air bag and a surface layer air bag;
every two adjacent layers of the multilayer air bags are fixedly connected, and a vent hole is arranged between the two adjacent layers of the multilayer air bags;
the lower end of the bottom layer air bag is provided with an air bag opening for inflating the air bag when the air bag descends;
the upper end of the surface layer air bag is closed.
2. The multi-layer airbag type air-drop buffer device according to claim 1, wherein: each layer of air bag is uniformly divided into a plurality of air chambers; and free air holes are arranged between every two adjacent air chambers of each layer.
3. The multi-layer airbag type air-drop buffer device as claimed in claim 2, wherein: the number of the air chambers separated by each layer of air bag is the same, and the air chambers of the upper layer and the lower layer are aligned;
an air pocket opening is formed below each air chamber of the bottom air bag;
and vent holes are arranged between the air chambers of every two adjacent layers of air bags.
4. The multi-layer airbag type air-drop buffer device according to claim 3, wherein: the air pocket opening is a one-way air inlet hole; the vent holes are unidirectional air holes, and the direction of the air holes is unidirectional upward.
5. The multi-layer airbag type air-drop buffer device according to claim 4, wherein: the one-way air hole is a pressure limiting air hole and is opened when the pressure difference between two ends of the air hole exceeds a pressure threshold value.
6. The multi-layer airbag type air-drop buffer device according to claim 5, wherein: the pressure limiting air hole is used for primary pressure limiting; the pressure threshold is 1.25 times atmospheric pressure;
when the pressure difference between the two ends of the air hole exceeds a pressure threshold value, the pressure limiting air hole is opened;
once the pressure limiting air hole is opened, the ventilation pressure limiting is invalid, and then the air can be freely ventilated upwards in a one-way mode.
7. The multi-layer airbag type air-drop buffer device according to claim 1, wherein: the air pocket opening is in a horn shape with a downward opening.
8. The multi-layer airbag type air-drop buffer device according to claim 7, wherein: the ratio of the diameter of the lower end opening of the air pocket port to the diameter of the upper end opening is not less than 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111258939.4A CN113799983A (en) | 2021-10-27 | 2021-10-27 | Multilayer air bag type air-drop buffering device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111258939.4A CN113799983A (en) | 2021-10-27 | 2021-10-27 | Multilayer air bag type air-drop buffering device |
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| CN113799983A true CN113799983A (en) | 2021-12-17 |
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| CN202111258939.4A Pending CN113799983A (en) | 2021-10-27 | 2021-10-27 | Multilayer air bag type air-drop buffering device |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09240595A (en) * | 1996-03-01 | 1997-09-16 | Nof Corp | Air bag device |
| CN1923618A (en) * | 2006-09-22 | 2007-03-07 | 湖南大学 | Double gasbag buffer unit |
| CN103910057A (en) * | 2014-03-12 | 2014-07-09 | 北京航空航天大学 | Universal inflatable multi-level anti-collision damping structure for high altitude airship |
| CN204605717U (en) * | 2015-04-02 | 2015-09-02 | 南京理工大学 | Buffer device for collision of automobile |
| CN107640319A (en) * | 2017-10-31 | 2018-01-30 | 航宇救生装备有限公司 | A kind of air-drop type gravity type air bag with buffering efficiency |
| CN108382598A (en) * | 2018-04-23 | 2018-08-10 | 长沙理工大学 | A kind of airborne multi-stage gasbag collaboration buffer unit of equipment |
-
2021
- 2021-10-27 CN CN202111258939.4A patent/CN113799983A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09240595A (en) * | 1996-03-01 | 1997-09-16 | Nof Corp | Air bag device |
| CN1923618A (en) * | 2006-09-22 | 2007-03-07 | 湖南大学 | Double gasbag buffer unit |
| CN103910057A (en) * | 2014-03-12 | 2014-07-09 | 北京航空航天大学 | Universal inflatable multi-level anti-collision damping structure for high altitude airship |
| CN204605717U (en) * | 2015-04-02 | 2015-09-02 | 南京理工大学 | Buffer device for collision of automobile |
| CN107640319A (en) * | 2017-10-31 | 2018-01-30 | 航宇救生装备有限公司 | A kind of air-drop type gravity type air bag with buffering efficiency |
| CN108382598A (en) * | 2018-04-23 | 2018-08-10 | 长沙理工大学 | A kind of airborne multi-stage gasbag collaboration buffer unit of equipment |
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