Coolant for air-bag gas generator and production method therefor
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B01D-03920
B01D-04624
출원번호
US-0018956
(2000-07-12)
우선권정보
JP-0200179 (1999-07-14)
국제출원번호
PCT/JP00/04672
(2001-12-27)
§371/§102 date
20011227
(20011227)
국제공개번호
WO01/05632
(2001-01-25)
발명자
/ 주소
Fukunaga, Katsuaki
Yagi, Satoshi
Ota, Mitsunori
Chiba, Emiko
출원인 / 주소
Daicel Chemical Industries, Ltd.
Chuo Hatsujo Kabushiki Kaisha
Kansai Wire Netting Co., Ltd.
대리인 / 주소
Birch, Stewart, Kolasch &
인용정보
피인용 횟수 :
5인용 특허 :
9
초록▼
The present invention provides a coolant for an air bag inflator in which unevenness in density in the axial direction is reduced even though the coolant is compressed in its axial direction.The coolant is a molded product made of wire rods and compressed in its axial direction. An absolute value of
The present invention provides a coolant for an air bag inflator in which unevenness in density in the axial direction is reduced even though the coolant is compressed in its axial direction.The coolant is a molded product made of wire rods and compressed in its axial direction. An absolute value of a difference between a radial pressure loss of the axially upper half portion of the coolant and a radial pressure loss of the axially lower half portion of the coolant is 10 mm H2O or less at a flow rate of 250 liters/minute under the atmosphere of 20° C.
대표청구항▼
1. A coolant for an air bag inflator, comprising:a cylindrical coolant body having a uniform thickness defined by an outer diameter and an inner diameter thereof and adapted to be disposed in a housing of the inflator for at least one of cooling and purifying gas discharged from the inflator, said c
1. A coolant for an air bag inflator, comprising:a cylindrical coolant body having a uniform thickness defined by an outer diameter and an inner diameter thereof and adapted to be disposed in a housing of the inflator for at least one of cooling and purifying gas discharged from the inflator, said coolant being formed by compressing a first end of a molded product made of wire rods in an axial direction thereof, and compressing a second end, opposing the first end, of the molded product along the axial direction, such that an absolute value of a difference between a radial pressure loss of the axially upper half portion of said coolant closer to the first end and a radial pressure loss of the axially lower half portion of said coolant closer to the second end is adjusted to be 10 mmH2O or less at a flow rate of 250 liters/minute under the atmosphere of 20° C. 2. A coolant for an air bag inflator according to claim 1, wherein the absolute value is 6 mmH2O or less at a flow rate of 250 liters/minute under the atmosphere of 20° C.3. A coolant for an air bag inflator according to claim 1, a difference in pressure losses between a vicinity of the first end and a vicinity of the second end of said coolant is 10 mmH2O or less, when it is measured in accordance with the following method:1) covering an inner peripheral surface of a cylindrically formed coolant from one of its axial end to its one-half the height with an annular covering member; 2) closing one of the first end and the second end of said coolant, in which the covering member is fitted, with a first supporting member having a manometer, closing the other of the first end and the second end of said coolant with a second supporting member having a gas-inflow pipe and a gas-flow meter, and fixing said coolant axially to prevent air from leaking between ends of said coolant and the supporting members; 3) introducing the air at a flow rate of 250 liters/minute from the gas-inflow pipe into an inner space of the covering member under the atmosphere of 20° C., and the pressure loss is measured; 4) turning said coolant the other way round with respect to the axial direction and covering the inner peripheral surface of a cylindrically formed coolant from the other one of its axial end to its one-half the height with the annular covering member; 5) closing the other of the first end and the second end of said coolant, in which the covering member is fitted, with the first supporting member, closing the one of the first end and the second end of said coolant with the second supporting member, and fixing said coolant axially to prevent air from leaking between ends of said coolant and the supporting members; 6) introducing the air at a flow rate of 250 liters/minute from the gas-inflow pipe into an inner space of the covering member under the atmosphere of 20° C., and measuring the pressure loss and 7) obtaining a difference in the pressure loss values obtained in 3) and 6), and determining its absolute value as a difference in radial pressure losses in the axial ends of said coolant. 4. A coolant for an air bag inflator according to claim 1, wherein a bulk density of said coolant is 3.0 to 5.0 g/cm3, and said coolant has a pressure loss of 10 mmH2O to 2000 mmH2O with respect to an amount of air of 1000 liters minute?1 under the atmosphere of 20° C.5. A coolant for an air bag inflator according to claim 1, wherein said coolant is an annular laminated body made of wire mesh formed by knitting stainless-steel wire rods.6. A method of producing a coolant for an air bag inflator, comprising:compressing a first end of a cylindrical molded product having a uniform thickness defined by an outer diameter and an inner diameter thereof in an axial direction thereof; and compressing a second end of the cylindrical molded product in the axial direction, such that an absolute value of a difference between a radial pressure loss of the axially upper half portion of the molded product closer to the first end and a radial pressure loss of the axially lower half portion of the molded product closer to the second end is adjusted to be 10 mmH2O or less at a flow rate of 250 liters/minute under the atmosphere of 20° C. 7. The method of producing a coolant according to claim 6, further comprising:adjusting a difference in pressure losses between axially opposite ends of the molded product to be 10 mmH2O or less when it is measured in accordance with the following method: 1) covering an inner peripheral surface of a cylindrically formed coolant from one of its axial end to its one-half the height with an annular covering member; 2) closing one of the first end and the second end of said coolant, in which the covering member is fitted, with a first supporting member having a manometer, closing the other of the first end and the second end of said coolant with a second supporting member having a gas-inflow pipe and a gas-flow meter, and axially fixing said coolant to prevent air from leaking between ends of said coolant and the supporting members; 3) introducing the air at a flow rate of 250 liters/minute from the gas-inflow pipe into an inner space of the covering member under the atmosphere of 20° C., and the pressure loss is measured; 4) turning said coolant the other way round with respect to the axial direction and covering the inner peripheral surface of a cylindrically formed coolant from the other one of its axial end to its one-half the height with the annular covering member; 5) closing the other of the first end and the second end of said coolant, in which the covering member is fitted, with the first supporting member, closing the one of the first end and the second end of said coolant with the second supporting member, and fixing said coolant axially to prevent air from leaking between ends of said coolant and the supporting members; 6) introducing the air at a flow rate of 250 liters/minute from the gas-inflow pipe into an inner space of the covering member under the atmosphere of 20° C., and measuring the pressure loss and 7) obtaining a difference in the pressure-loss values obtained in 3) and 6), and determining its absolute value as a difference in radial pressure losses in the axial ends of said coolant. 8. The method of producing a coolant according to claims 6 or 7, wherein said compressing steps include,the first compression step of compressing a first end of the molded product in its axial direction, and the second compression step of turning the molded product axially upside down and further compressing a second end of the molded product in the axial direction. 9. The method of producing a coolant according claim 8, wherein compressing distances in the first and second compression steps are substantially equal.10. The method of producing a coolant according to claim 6, further comprising:compressing the molded product in a the radial direction thereof. 11. A method of producing a coolant according to claim 6, wherein said molded product is an annular laminated body obtained by forming a knitted wire mesh made of stainless-steel wire rods into a cylindrical body, pressing the cylindrical body in the radial direction to form into a plate body, and then rolling said plate body many times cylindrically.12. An air bag inflator, comprising:a housing having a gas discharge port; ignition means adapted to be activated upon an impact; gas generating means adapted to be ignited and burnt due to activation of the ignition means for generating a combustion gas; and coolant means for one of purifying and cooling said combustion gas, said coolant means being the coolant means according to claim 1. 13. An air bag apparatus, comprising:an air bad inflator; an impact sensor for detecting an impact to activate said inflator; an air bag introducing therein a gas generated by said inflator to inflate; and a module case for accommodating said air bag, wherein said air bag inflator is the inflator according to claim 12.
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이 특허에 인용된 특허 (9)
Guglielmi Geno J. (Grand Prairie TX), Abatement of tinkles in wire mesh.
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