CN203469963U - Cooling and thermal-insulation structure for gas generator - Google Patents
Cooling and thermal-insulation structure for gas generator Download PDFInfo
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- CN203469963U CN203469963U CN201320516675.2U CN201320516675U CN203469963U CN 203469963 U CN203469963 U CN 203469963U CN 201320516675 U CN201320516675 U CN 201320516675U CN 203469963 U CN203469963 U CN 203469963U
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Abstract
The utility model relates to a cooling and thermal-insulation structure for a gas generator. The cooling and thermal-insulation structure is used for carrying out thermal-insulation treatment on a site which is required to be connected with an air bag and is adjacent to an exhaust hole of a firework type columnar gas generator so as to prevent the air bag from being burnt through and molten by a high-temperature shell. The cooling and thermal-insulation structure is characterized in that a chemical cooling agent layer is arranged in an exhaust channel of a generator shell, wherein the generator shell corresponding to the exhaust channel is covered by a thermal-insulation layer, and the thermal-insulation layer is coated with a fixed layer. Compared with the prior art, the cooling and thermal-insulation structure has the advantages that the process is simple, the thermal-insulation effect is good, and the cost is extremely low; the thermal-insulation effect can be regulated through flexibly regulating the use level of cooling agents in the generator, the thickness of the thermal-insulation layer, the materials of the thermal-insulation layer and the thickness of the wall of a thermal shrinkage tube; the thermal shrinkage tube not only can play roles in fixing the thermal-insulation layer and insulating the heat, but also can form a well sealing effect with the air bag due to the elasticity and is tightly adhered to the generator, so that the gas tightness problem caused when the air generator is connected with the air bag can be solved, and the air leakage during the air inflation of the generator is avoided.
Description
Technical field
The utility model relates to a kind of cooling and insulating structure of gas generator, is mainly used in needing near pyrotechnic column gas generator exhaust outlet the insulation with airbag junction, avoids high temperature housing that airbag is burnt and fusing causes gas leakage.
Background technology
Firework type gas generator is the gas generator that contains chemical gas producing medicinal, and airbag common and that macromolecular material is made links together, and is filled with the gas of uniform temperature in the backward airbag of lighting a fire.Gas generator is due to the longevity of service requiring, must bring the gas-forming agent dose packing into many, the problems such as housing and gas outlet temperature height, near gas vent, with the connected case temperature of airbag, be particularly the highest in whole generator, if do not done insulation, probably airbag is scalded, cause the problem of junction gas leakage.And the gas generator of part purposes requires to be filled with high-temperature gas, to guarantee that inflating rear airbag temperature can remain on 80 ℃ of above certain hours.This just requires chemical cooling agent can not use too much, and near case temperature exhaust outlet will inevitably be very high, must do insulation.
Conventional insulation method has at present: on generator body, use adiabatic coating or coating, adhere to high temperature-resistant polymer heat insulation layer or ceramic insulation layer etc.But these methods have a common feature, be exactly that cost is too high, and some method insulation effect bad, some method technology difficulty is high.
Summary of the invention
The purpose of this utility model is to provide a kind of cooling and insulating structure of gas generator, and its technique is simple, insulation effect good, and cost is extremely low.
The technical solution of the utility model is: in the exhaust passage of generator body, have chemical cooling agent layer; The generator body corresponding with exhaust passage covers heat insulation layer outward, heat insulation layer outer cladding fixed bed.
Chemical cooling agent in described chemical cooling agent layer is one or more in ammonium oxalate, oxamides, aluminium hydroxide, sodium acid carbonate, basic magnesium carbonate, basic zinc carbonate, ferrous carbonate.Chemistry cooling agent be can endothermic decomposition a class chemical substance.Packed in the exhaust passage of generator body inside, high-temperature gas is flowed through after chemical cooling agent, and chemical cooling agent endothermic decomposition plays cooling effect to high-temperature gas.The dose packing into is that Outlet Gas Temperature is as required adjusted.Be that chemical cooling agent can be adjusted weight as required, Outlet Gas Temperature can be reduced to rational degree.
The structure of the chemical cooling agent in described chemical cooling agent layer be disc-shaped, cylindric, with the cylindric of mesopore or be graininess, be the tablet being pressed into.
The cellular heat insulation layer material that described heat insulation layer is heat-insulating material establishment, bonding or pressing forms.Described heat insulation layer covers generator body completely, plays the effect that isolated heat reduces generator skin temperature.
Described heat insulation layer is asbestos cloth, glass fabric.
The described layer that is coated and fixed is heat-shrink tube, and this heat-shrink tube internal diameter is greater than generator body external diameter and adds the numerical value 1-8mm after upper thermal insulating layer double thickness.The described layer that is coated and fixed is outermost for being coated on generator body, in order to the fixing layer of material of heat insulation layer.It has played heat insulation effect to a certain extent.
The described layer that is coated and fixed is fluorubber heat-shrink tube or polytetrafluoroethylene (PTFE) heat-shrink tube.Described fluorubber heat-shrink tube can tolerate the high temperature of 400 ℃ of left and right the long period and not melt, is out of shape, burns.During use, 175 ℃ or above maintenance 15-30 minute or longer time, can shrink completely and fix heat insulation layer material.The described layer that is coated and fixed can also be common heat resisting temperature lower than the heat-shrink tube of 200 ℃.
The outer part of the described generator body corresponding with exhaust passage covers heat insulation layer, or all covers heat insulation layer.
The layer that is coated and fixed described in the utility model can be also to stick on heat insulation layer with macromolecule compound, as the layer that is coated and fixed.
Chemical cooling agent layer of the present utility model, heat insulation layer, this three parts of layer that are coated and fixed are the formation gas generator cooling and insulating structures of combining in order, compared with prior art, the utility model not only technique is simple, and the process time is short, insulation effect good, and cost is extremely low.While take the one section of thermo-lag 50mm length of need to leaving no room for manoeuvre, diameter 35mm, work, the gas generator shell of 600 ℃ of left and right of shell maximum temperature is example, use cooling and insulating structure described in the utility model, Production Time the shortest can be in 20min～30min left and right, after gas generator work, housing maximum temperature is not higher than 200 ℃, and all raw material cost is no more than 1 yuan.The utility model can be by the consumption of cooling agent in flexible adjustment generator, the methods such as thickness of the material of the thickness of heat insulation layer, heat insulation layer, pyrocondensation tube wall be adjusted insulation effect.The utility model use heat-shrink tube fixedly heat insulation layer has: fixedly heat insulation layer is avoided sliding, and facilitates the operations such as follow-up connection airbag; Heat-shrink tube not only can play the fixedly effect of heat insulation layer and isolated heat, and owned elasticity can and airbag between form good sealing function, heat-shrink tube fits tightly on generator, air-tightness problem in the time of can solving cooling and insulating structure and be connected with airbag, gas leakage while avoiding generator inflation.
Accompanying drawing explanation
Fig. 1 is cross sectional representation of the present utility model.
Fig. 2 is structural representation of the present utility model.
Fig. 3 is confined state schematic diagram of the present utility model.
The specific embodiment
Below in conjunction with embodiment, the utility model is further described, but protection domain of the present utility model is not only confined to embodiment, the modification that the professional in this field makes the utility model scheme, within all belonging to protection domain of the present utility model.
In Fig. 1, in the exhaust passage 2 of generator body 1, there is chemical cooling agent layer 3; The outer covering heat insulation layer 4 of generator body 1, the outer formation of heat insulation layer 4 be coated and fixed layer 5.
In Fig. 2, in the exhaust passage 2 of generator body 1, there is chemical cooling agent layer 3; The outer covering heat insulation layer 4 of generator body 1, the outer formation of heat insulation layer 4 be coated and fixed layer 5.
In Fig. 3, it is the confined state signal of cooling and insulating structure of the present utility model and airbag.Outside the end of generator body 1, cover heat insulation layer 4 and fixed bed 5,6 is airbag.
External diameter is the cooling and insulating structure preparation of 32mm gas generator.First that generator body 1 surface clean is clean, after natural drying, again the long piece housing of the distance steam vent 5cm contacting with airbag is coated with asbestos cloth, asbestos cloth thickness is 1 millimeter, cutting out area is rectangle 5cm * 10.1cm, then the fluorubber heat-shrink tube that by diameter is Ф 35 is enclosed within on asbestos cloth, be placed in the baking oven of 175 ℃, keep temperature 30 minutes, then generator is taken out, asbestos cloth forms heat insulation layer 4 at generator body 1, fluorubber heat-shrink tube the outer formation of heat insulation layer 4 be coated and fixed layer 5, after cooling, 5 grams, the tablet that packs oxamides compacting in the exhaust passage 2 of generator body 1 into, compressing tablet diameter is 4 ± 0.1mm, thickness is 2 ± 0.1mm.Form chemical cooling agent layer 3.
External diameter is the cooling and insulating structure preparation of 33mm gas generator.First that generator body surface clean is clean, with hot-air seasoning, the long piece housing of the distance steam vent 10cm contacting with airbag is coated with glass fabric, its thickness is 1.5 millimeters again, and cutting out area is rectangle 10cm * 10.4cm, then the polytetrafluoroethylene (PTFE) heat-shrink tube that by diameter is Ф 38 is enclosed within on asbestos cloth, be placed in the baking oven of 220 ℃, keep temperature 20 minutes, then generator is taken out, after cooling, pack 3 grams of the random powders that basic zinc carbonate makes into.
External diameter is the cooling and insulating structure preparation of 35mm gas generator.First that generator body surface clean is clean, by oven for drying, again the long piece housing of the distance steam vent 10cm contacting with airbag is coated with silicon rubber glass fiber cloth, its thickness is 2 millimeters, cutting out area is rectangle 10cm * 10.4cm, then the fluorubber heat-shrink tube that by diameter is Ф 42mm is enclosed within on silicon rubber glass fiber cloth, be placed in the baking oven of 175 ℃, keep temperature 40 minutes, then generator is taken out, cooling after, pack 9 grams, the tablet of aluminium hydroxide compacting into, compressing tablet diameter is 3 ± 0.1mm, and length is 5 ± 0.1mm.
Claims (9)
1. a cooling and insulating structure for gas generator, is characterized in that: in the exhaust passage (2) of generator body (1), have chemical cooling agent layer (3); Outer heat insulation layer (4), heat insulation layer (4) the outer cladding fixed bed (5) of covering of the generator body (1) corresponding with exhaust passage (2).
2. according to the cooling and insulating structure of the gas generator described in claims 1, it is characterized in that: the structure of the chemical cooling agent in described chemical cooling agent layer is disc-shaped or cylindric.
3. according to the cooling and insulating structure of the gas generator described in claims 2, it is characterized in that: the structure of the chemical cooling agent in described chemical cooling agent layer is cylindric with mesopore.
4. according to the cooling and insulating structure of the gas generator described in claims 1, it is characterized in that: the structure of the chemical cooling agent in described chemical cooling agent layer is graininess.
5. according to the cooling and insulating structure of the gas generator described in claims 1, it is characterized in that: the cellular heat insulation layer material that described heat insulation layer is heat-insulating material establishment, bonding or pressing forms.
6. according to the cooling and insulating structure of the gas generator described in claims 1 or 5, it is characterized in that: described heat insulation layer is asbestos cloth, glass fabric.
7. according to the cooling and insulating structure of the gas generator described in claims 1, it is characterized in that: described in be coated and fixed layer be heat-shrink tube, this heat-shrink tube internal diameter is greater than generator body external diameter and adds the numerical value 1-8mm after upper thermal insulating layer double thickness.
8. according to the cooling and insulating structure of the gas generator described in claims 1 or 7, it is characterized in that: described in be coated and fixed layer be fluorubber heat-shrink tube or polytetrafluoroethylene (PTFE) heat-shrink tube.
9. according to the cooling and insulating structure of the gas generator described in claims 1, it is characterized in that: the outer part of the described generator body (1) corresponding with exhaust passage (2) covers heat insulation layer, or all covers heat insulation layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320516675.2U CN203469963U (en) | 2013-08-23 | 2013-08-23 | Cooling and thermal-insulation structure for gas generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320516675.2U CN203469963U (en) | 2013-08-23 | 2013-08-23 | Cooling and thermal-insulation structure for gas generator |
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| Publication Number | Publication Date |
|---|---|
| CN203469963U true CN203469963U (en) | 2014-03-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320516675.2U Expired - Fee Related CN203469963U (en) | 2013-08-23 | 2013-08-23 | Cooling and thermal-insulation structure for gas generator |
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| Country | Link |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104415710A (en) * | 2013-08-23 | 2015-03-18 | 湖北航鹏化学动力科技有限责任公司 | Gas generator cooling and heat insulation structure and preparation method thereof |
-
2013
- 2013-08-23 CN CN201320516675.2U patent/CN203469963U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104415710A (en) * | 2013-08-23 | 2015-03-18 | 湖北航鹏化学动力科技有限责任公司 | Gas generator cooling and heat insulation structure and preparation method thereof |
| CN104415710B (en) * | 2013-08-23 | 2016-06-15 | 湖北航鹏化学动力科技有限责任公司 | A kind of cooling and insulating structure of gas generator and preparation method thereof |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140312 Termination date: 20200823 |
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| CF01 | Termination of patent right due to non-payment of annual fee |