CN221471263U - Filter, gas generator, airbag and vehicle - Google Patents

Abstract

The utility model discloses a filter, a gas generator, an airbag and a vehicle. The filter comprises: a first wall for filtering the air flow; the first wall includes a flow directing portion having a porosity less than a porosity of a portion of the first wall other than the flow directing portion, the flow directing portion being adapted to correspond to a first vent hole location on the housing of the gas generator. The side wall of the filter is provided with the flow guide part with reduced porosity, the air resistance of the flow guide part is larger than that of other parts of the side wall, and the air in the inner ring space of the filter is forced to pass through the other parts of the side wall, so that the flowing distance of the air is increased, the cooling time of the air is prolonged, the high-temperature air is prevented from leaking out and scalding the safety air bag, and the reliability of the safety air bag is obviously improved.

Description

Filter, gas generator, airbag and vehicle

Technical Field

The present utility model relates generally to the field of vehicle airbag technology, and more particularly to a filter, a gas generator, an airbag, and a vehicle.

Background

In the existing automobiles, the safety airbag is an important safety device on the automobiles, and can effectively reduce the injury of the accidents to human bodies when the automobiles are in accidents, thereby protecting the life safety of drivers and passengers. The gas in the air bag is mainly generated by a gas generator, the gas generating medicine in the gas generator converts solid chemical substances into gas through quick combustion chemical reaction, dregs in the gas are filtered out through a filter, and the gas enters the air bag.

The gas generator in the prior art comprises a shell and a filter screen with a filter hole, wherein the filter screen is positioned inside the shell, an exhaust hole is formed in the shell, a gas generating medicine is arranged in the filter screen, and air flow generated by combustion and explosion of the gas generating medicine is discharged into an air bag through the exhaust hole after being filtered by the filter screen. However, the filter has imperfect structure design of the filtered air flow, and the air flow is guided reasonably, so that the position of the filter screen corresponding to the air outlet is broken down easily, residues are leaked into the air bag, and safety accidents are caused.

Accordingly, there is a need to provide a filter, a gas generator, an airbag and a vehicle to at least partially solve the above-mentioned problems.

Disclosure of utility model

In the summary, a series of concepts in a simplified form are introduced, which will be further described in detail in the detailed description. The summary of the utility model is not intended to define the key features and essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

To at least partially solve the above problems, a first aspect of the present utility model provides a filter comprising:

A first wall for filtering a gas flow;

The first wall includes a flow directing portion having a porosity less than a porosity of a portion of the first wall other than the flow directing portion, the flow directing portion being adapted to correspond to a first vent location on a housing of a gas generator.

Optionally, the first wall is a multi-layer structure, and a plurality of ventilation holes are formed in the multi-layer structure, so that gas can pass through the first wall, and the thickness of the flow guiding part is smaller than that of a part, which is not the flow guiding part, of the first wall.

Optionally, the average gap distance between layers of the multilayer structure located at the flow guiding portion is a first gap distance;

the average gap distance between layers of the multilayer structure of the part not of the flow guiding part is a second gap distance;

The first gap distance is less than the second gap distance.

Optionally, the flow guiding portion forms a groove on an outer surface of the first wall.

Optionally, the flow guiding portion forms a protrusion on an inner surface of the first wall.

Optionally, the flow guiding part is annularly arranged, an annular groove is formed on the outer surface of the first wall, and an annular protrusion is formed on the inner surface of the first wall.

Optionally, the first wall is provided with a plurality of ventilation holes, and the aperture of the ventilation holes of the diversion part is smaller than that of the ventilation holes of the part, which is not the diversion part, of the first wall.

Optionally, the flow guiding part is arranged along the circumferential direction of the first wall, and the flow guiding part and the first wall are integrally formed.

Optionally, the flow guiding part is V-shaped groove or U-shaped groove along the axial section of the filter.

A second aspect of the utility model provides a gas generator for generating an explosive gas flow, comprising:

A housing comprising a second wall provided with a first vent;

The filter also comprises any one of the technical schemes.

Optionally, the first exhaust hole is correspondingly in the range of the diversion part.

Optionally, a point of the outer surface of the flow guiding part, which is farthest from the second wall in a straight line, is correspondingly in the range of the first exhaust hole.

Optionally, the separation between the flow guide and the housing is greater than the separation between the portion of the first wall other than the flow guide and the housing.

Optionally, the gas generator further comprises:

The pressure maintaining ring is arranged on the inner wall of the shell to seal the first exhaust hole, and can be broken through by explosive airflow.

Optionally, the gas generator further comprises:

The ignition medicine box is arranged in the inner annular space of the filter, and a gas production medicine bin is arranged between the ignition medicine box and the first wall of the filter.

Optionally, the gas generator further comprises:

The ignition powder medicine bin is arranged in the inner cavity of the ignition powder medicine box, a second exhaust hole is formed in the box body of the ignition powder medicine box, and flame generated by combustion and explosion of the ignition powder medicine bin can be released towards the gas production powder medicine bin through the second exhaust hole.

Optionally, the gas generator further comprises:

the end cover is arranged at the top of the filter, a supporting part is arranged at the top of the ignition powder box, and the supporting part supports the end cover.

Optionally, a mounting groove is formed in the bottom of the shell, and the mounting groove is recessed towards the inner cavity of the shell;

the base is arranged in the mounting groove;

The ignition device is arranged in the base and is connected with the ignition powder bin, and the ignition device can detonate the ignition powder bin when being electrified.

Optionally, the gas generator further comprises:

And the bottom end of the ignition medicine box is fixedly connected with the fixing ring, and the fixing ring is fixedly connected with the base.

Optionally, the second wall is provided with a plurality of first exhaust holes of different heights;

Each first exhaust hole corresponds to the flow guiding part.

A third aspect of the present utility model provides an airbag comprising an airbag, further comprising a gas generator as claimed in any one of the above claims, the gas generator being connected to the airbag.

A fourth aspect of the utility model provides a vehicle comprising an airbag according to any one of the above-described aspects.

According to the filter, the gas generator, the safety airbag and the vehicle, the flow guide part is arranged on the side wall of the filter, the porosity of the flow guide part is reduced, the gas resistance of the flow guide part is larger than that of other parts of the side wall, and the gas in the inner ring space of the filter is forced to pass through the other parts of the side wall, so that the guiding of the gas flow is enhanced, the possibility that the flow guide part is broken down is reduced, and the reliability of the safety airbag is improved.

Drawings

The following drawings of embodiments of the present utility model are included as part of the utility model. Embodiments of the present utility model and their description are shown in the drawings to explain the principles of the utility model. In the drawings of which there are shown,

FIG. 1 is a cross-sectional view of a gas generator according to a preferred embodiment of the present utility model;

FIG. 2 is a cross-sectional view of a filter according to a preferred embodiment of the present utility model;

FIG. 3 is a schematic view of the airflow path of a filter according to a preferred embodiment of the utility model;

Fig. 4 is a cross-sectional view of an ignition charge cartridge according to a preferred embodiment of the present utility model;

FIG. 5 is a cross-sectional view of a housing according to a preferred embodiment of the present utility model;

Fig. 6 is a front view of a filter according to a preferred embodiment of the present utility model.

Reference numerals illustrate:

100: gas generator 101: upper shell

102: Lower housing 103: ignition tool

104: Base 105: fixing ring

106: Filter 161: a first wall

162: Diversion section 107: gas-producing medicine bin

108: Ignition charge box 181: box body

182: Second exhaust hole 183: support part

109: Ignition charge cartridge 110: end cap

111: First exhaust hole 112: pressure-retaining ring

113: Groove 114: a second wall

115: Mounting groove

Detailed Description

In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present utility model. It will be apparent, however, to one skilled in the art that the utility model may be practiced without one or more of these details. In other instances, well-known features have not been described in detail in order to avoid obscuring the utility model.

In the following description, a detailed description will be given for the purpose of thoroughly understanding the present utility model. It should be appreciated that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of these exemplary embodiments to those skilled in the art. It will be apparent that embodiments of the utility model may be practiced without limitation to the specific details that are familiar to those skilled in the art. Preferred embodiments of the present utility model are described in detail below, however, the present utility model may have other embodiments in addition to these detailed descriptions.

Ordinal numbers such as "first" and "second" cited in the present utility model are merely identifiers and do not have any other meaning, such as a particular order or the like. Also, for example, the term "first component" does not itself connote the presence of "second component" and the term "second component" does not itself connote the presence of "first component".

It should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer" and the like are used in the present utility model for illustrative purposes only and are not limiting.

The utility model discloses a filter, a gas generator, an airbag and a vehicle.

The utility model discloses a filter, a gas generator, an airbag and a vehicle.

Exemplary embodiments according to the present utility model will now be described in more detail with reference to the accompanying drawings.

As shown in fig. 1 and 2, in a preferred embodiment, a filter 106 includes:

A first wall 161, the first wall 161 for filtering the air flow; the first wall 161 is a side wall of the filter 106, and the first wall 161 is annular overall, and can be designed into other shapes according to application requirements, such as a round rectangle;

The first wall 161 includes a flow guiding portion 162, the flow guiding portion 162 having a porosity that is smaller than a porosity of a portion of the first wall 161 that is not the flow guiding portion, the flow guiding portion 162 being adapted to correspond to a position of the first exhaust hole 111 on the housing of the gas generator 100. So that the guiding part 162 can guide the gas, so that more gas passes through the position of the non-guiding part, thereby reducing the breakdown probability of the guiding part 162, preventing the residue generated in the blasting process from entering the air bag, and reducing the occurrence of safety accidents.

As shown in fig. 1, the filter 106 is disposed in an inner cavity of a housing of the gas generator 100, a first exhaust hole 111 is provided on a side wall of the housing, the air guiding portion 162 corresponds to the first exhaust hole 111, and an air outlet area of the air guiding portion 162 is required to cover the first exhaust hole 111.

The air guide portion 162 in this embodiment can pass through the air flow, and compared with the air guide structure which cannot pass through the air flow in the prior art, the air permeability of the filter 106 is not obviously reduced, and the functions of cooling the filter residues of the filter 106 are more beneficial.

Before the porosity is reduced, the air guide part 162 has the same original ventilation structure as the other parts of the first wall 161, after the porosity of the air guide part 162 is reduced, the air resistance of the air guide part 162 is increased, and the air in the space in the inner ring of the filter 106 is forced to pass through the parts with smaller air resistance of the other parts of the first wall 161, as shown in fig. 3, so that the flowing distance of the air is increased, the cooling time of the air is prolonged, and the hot air is prevented from leaking out from the first air exhaust hole 111 to scald the air bag.

According to the filter in the embodiment, the flow guide part is arranged on the side wall, the porosity of the flow guide part is reduced, the air resistance of the flow guide part is larger than that of other parts of the side wall, and the air in the space of the inner ring of the filter is forced to pass through the other parts of the side wall, so that the flowing distance of the air is increased, the cooling distance of the air is longer when the air is discharged, the cooling effect is better, the temperature of flame and residues (if leakage exists) is lower, the possibility that the flow guide part is broken down is reduced, the probability that the flame and the residues are discharged out of the exhaust hole of the shell is reduced, and the reliability of the safety airbag is remarkably improved.

In one embodiment, the filter 106 may be formed by stacking multiple layers of longitudinal and transverse webs, and the filter screen is made of DC03 cold-rolled low-carbon steel and has excellent deep drawing performance. Through adopting this kind of simple structure easy manufacturing, functional integrated's filter structure, the gaseous effect that plays the water conservancy diversion that produces when the point explodes, effectively prevent that the residue from spilling scalding the air pocket for gas generator product stability, security improve greatly.

In one embodiment, the first wall 161 is a multi-layer structure, such as a multi-layer mesh structure, and a plurality of ventilation holes are formed in the multi-layer structure so that gas can pass through the first wall 161, and the thickness a of the diversion portion 162 is smaller than the thickness b of the non-diversion portion on the first wall 161.

Before the thickness is reduced, the air guiding portion 162 has the same original air permeable structure, such as the same pore size or the same porosity, as the other parts of the first wall 161, the thickness a of the air guiding portion 162 is reduced, the air permeable structure inside the air guiding portion 162 is changed, the air resistance of the air guiding portion 162 is increased, and the air in the inner ring space of the filter 106 is forced to pass through the other parts with smaller air resistance of the first wall 161, as shown in fig. 3.

In one embodiment, the average gap distance from layer to layer of the multilayer structure at the flow guide 162 is the first gap distance;

The average gap distance between layers of the multilayer structure of the part of the non-diversion part is a second gap distance;

the first gap distance is less than the second gap distance.

Because the first wall 161 is of a multi-layer structure, the thickness of the guide portion 162 is reduced, the average gap distance between the layers of the guide portion 162 is reduced, the layers are closer to each other, the porosity and the structural strength of the guide portion 162 are affected, so that the porosity of the guide portion 162 is reduced, and the structural strength is improved.

In one embodiment, as shown in fig. 1 and 2, the deflector 162 forms a groove 113 in the outer surface of the first wall 161.

The filter 106 is arranged in the inner cavity of the shell of the gas generator 100, the first exhaust hole 111 is formed in the side wall of the shell, the distance between the first exhaust hole 111 and the filter 106 is increased by the groove 113, the cooling distance is longer when the gas is exhausted from the first exhaust hole 111, the cooling effect is better, the temperature of flame and residues (if leakage exists) is lower, the probability that the flame and residues are exhausted from the shell exhaust hole is reduced, the filter residue cooling function of the filter 106 is obviously improved, the integral structure of the gas generator 100 is simplified, the difficulty of the production process is reduced, and the reliability of the safety airbag is improved.

In one embodiment, the deflector 162 forms a protrusion on the inner surface of the first wall 161. The guide part 162 protrudes from the inner circumferential surface of the filter 106, and helps the air flow to guide, and the air flow blown to the guide part 162 is split to the upper and lower sides, so that the air in the inner annular space of the filter 106 is forced to pass through other parts of the first wall 161, as shown in fig. 3, thereby increasing the distance of the air flow, prolonging the cooling time of the air, and preventing the high-temperature air from leaking out from the first exhaust hole 111 to scald the air bag.

The guide part 162 protrudes from the inner circumferential surface of the filter 106, so that the structural strength of the filter 106 can be enhanced, when the gas generating medicine burns and explodes, shock waves and flames impact the filter 106, and the guide part 162 plays a role of reinforcing ribs at the moment, so that the guide part 162 is prevented from being bent or torn.

In one embodiment, the flow guide 162 may have a discontinuous structure, for example, a discontinuous multi-stage annular groove 113 is formed on the outer surface of the first wall 161, so long as it corresponds to each of the first exhaust holes 111, and a discontinuous multi-stage annular protrusion is formed on the inner surface of the first wall 161.

Preferably, the diversion portion 162 may be disposed annularly, and form an annular groove 113 on the outer surface of the first wall 161, and form an annular protrusion on the inner surface of the first wall 161.

The guide part 162 is annular, namely, a structure formed by continuously surrounding, the formed groove 113 is also a structure formed by continuously surrounding, and the formed protrusion is also a structure formed by continuously surrounding.

In one embodiment, the first wall 161 is provided with a plurality of ventilation holes, and the ventilation holes of the diversion portion 162 have a smaller diameter than the ventilation holes of the portion of the first wall 161 that is not the diversion portion.

Before the aperture of the ventilation hole is reduced, the air guide part 162 has the same original ventilation structure as the other parts of the first wall 161, the aperture of the ventilation hole of the air guide part 162 is reduced, the ventilation structure inside the ventilation hole is changed, and the air resistance of the air guide part 162 is increased. For example, the diversion portion 162 is formed by compressing and deforming a specific portion of the first wall 161, and the pore diameter of the ventilation hole is reduced, so that the gas in the inner ring space of the filter 106 is forced to pass through other portions of the first wall 161 with smaller air resistance, as shown in fig. 3.

In one embodiment, the flow guiding portion 162 is disposed along the circumferential direction of the first wall 161, and the flow guiding portion 162 is integrally formed with the first wall 161.

The diversion part 162 can be obtained by stamping and deforming a specific part of the first wall 161, and the diversion part 162 and the first wall 161 of the filter 106 are integrally formed.

In one embodiment, as shown in fig. 1 and 2, the flow guide 162 has a V-groove shape or a U-groove shape in an axial cross section of the filter 106.

The groove bottom of the guide part 162 faces the inside of the filter 106 and protrudes from the inner circumferential surface of the first wall 161, and the groove opening faces the outside of the filter 106.

The diversion part 162 is designed to be groove-shaped, a groove 113 can be formed on the outer circumferential surface of the first wall 161 of the filter 106, the groove bottom protrudes from the inner circumferential surface of the filter 106, the diversion part 162 is used for guiding the airflow, the airflow blown to the diversion part 162 is divided into the upper side and the lower side, and the air in the inner ring space of the filter 106 is forced to pass through other parts of the first wall 161, as shown in fig. 3, so that the flowing distance of the air is increased, the cooling time of the air is prolonged, and the high-temperature air is prevented from leaking out from the first exhaust hole 111 to scald the air bag.

As shown in fig. 1, an embodiment of the present utility model also provides a gas generator 100 for generating an explosive gas flow, comprising:

a housing including a second wall 114, the second wall 114 being provided with a first exhaust hole 111; the second wall 114 is a side wall of the housing, and the second wall 114 is annular overall, and can be designed into other shapes according to application requirements, such as a round rectangle; the first exhaust holes 111 may be provided in plurality, and are uniformly distributed on the side wall of the housing;

also included is a filter 106 as in any of the above embodiments, the filter 106 being disposed within the interior cavity of the housing.

The gas generator 100 in this embodiment, through setting up the filter 106 in the inner chamber of shell, the gas cooling distance is longer when discharging, and the cooling effect is better, and the temperature of flame and residue (if there is the leakage) is lower, has reduced the probability that flame and residue discharged the shell exhaust hole, prevents that high temperature gas from spilling and scalding the air bag, has improved the reliability of air bag, simultaneously, because the water conservancy diversion portion 162 has guaranteed that filter 106 is difficult to be broken down to the safety in utilization of air bag has been guaranteed.

In one embodiment, as shown in fig. 1, the first exhaust hole 111 corresponds to be within the range of the guide part 162.

The height of the diversion part 162 is larger than the aperture of the first exhaust hole 111, the notch of the groove 113 formed by the diversion part 162 can cover the first exhaust hole 111, by the design, the diversion effect of the diversion part 162 can be improved, the situation that the part of the first wall 161 which is not the diversion part is closer to the first exhaust hole 111, so that the air flow is discharged to the first exhaust hole 111 from the part of the first wall 161 which is not the diversion part more is avoided, and the filter residue cooling function of the filter 106 is reduced.

In one embodiment, the point at which the outer surface of the flow guide 162 is the farthest from the second wall 114 in a straight line corresponds to the range of the first exhaust hole 111.

The outer surface of the flow guiding part 162 is at the furthest point from the second wall 114, namely the lowest position of the groove 113 formed by the flow guiding part 162, the lowest position of the groove 113 is arranged within the aperture range of the first exhaust hole 111, the flow guiding effect of the flow guiding part 162 can be further improved through the design, and the filter residue cooling function of the filter 106 is ensured.

In one embodiment, the separation between the deflector 162 and the housing is greater than the separation between the portion of the first wall 161 that is not the deflector and the housing.

The distance between the air guide part 162 and the shell, that is, the distance between the inner wall of the groove 113 formed by the air guide part 162 and the inner wall of the shell can be increased by the design, the cooling distance is longer when the air is discharged out of the first air outlet 111, the cooling effect is better, the temperature of flame and residues (if leakage exists) is lower, the probability that the flame and residues are discharged out of the shell air outlet is reduced, and the filter residue cooling function of the filter 106 is obviously improved.

In one embodiment, as shown in fig. 1, the outer shell includes an upper shell 101 and a lower shell 102, where the upper shell 101 and the lower shell 102 are fixedly connected, and the outer shell is usually made of metal, for example, aluminum, and can be fixedly connected by friction welding, so as to ensure the connection strength and not to be flushed by explosive gas flow.

The first wall 161 of the lower housing 102 is provided with a ring of flanges that may be used to mount and secure the gas generator 100.

The lower portion of the filter 106 may be in interference fit connection with the lower housing 102, thereby securing to the interior cavity of the housing. There is still a gap between the upper portion of the filter 106 and the upper case 101, which is a passage through which the explosive gas flow is discharged.

In one embodiment, as shown in fig. 1, the gas generator 100 further comprises:

The pressure maintaining ring 112, the pressure maintaining ring 112 is arranged on the inner wall of the shell to seal the first exhaust hole 111, and the pressure maintaining ring 112 can be broken through by the explosion airflow.

Because the open space is unfavorable for forming explosion, the pressure maintaining ring 112 temporarily seals the first exhaust hole 111, and before the gas generating medicine burns and explodes, the inner cavity of the shell forms a sealed space, so that the gas generating medicine is more favorable for completing the instantaneous explosion, and the reliability of the safety airbag is improved.

The pressure maintaining ring 112 may be aluminum foil, and is adhered and fixed on the inner wall of the upper case 101, and the height of the pressure maintaining ring 112 is greater than the diameter of the first exhaust hole 111, so that the pressure maintaining ring is convenient to adhere and can seal the first exhaust hole 111. The first exhaust hole 111 is attached with aluminum foil, the first few milliseconds after the explosion is performed with pressure maintaining function, the aluminum foil is broken by pressure after the pressure value is increased, and gas generated by the combustion and explosion of the gas generating agent enters the air bag of the safety air bag from the first exhaust hole 111.

In one embodiment, as shown in fig. 1, the gas generator 100 further comprises:

The ignition cartridge 108, the ignition cartridge 108 is disposed in the inner annular space of the filter 106, and the gas generating cartridge 107 is disposed between the ignition cartridge 108 and the first wall 161 of the filter 106. The gas generating medicine bin 107 is filled with gas generating medicine, a large amount of gas is generated when the gas generating medicine burns and explodes during point explosion, flame and high-temperature residues are generated at the same time, and the filter 106 can block the flame and the high-temperature residues as much as possible and pass through the gas.

In one embodiment, as shown in fig. 1 and 4, the inner cavity of the ignition powder box 108 is provided with an ignition powder bin 109, the box body 181 of the ignition powder box 108 is provided with a second exhaust hole 182, and flame generated by combustion and explosion of the ignition powder bin 109 can be released towards the gas generating powder bin 107 through the second exhaust hole 182. The side wall and the top of the box 181 may be provided with a plurality of second exhaust holes 182.

The ignition powder bin 109 is filled with ignition powder, and the ignition powder burns and explodes to generate flame, so that the gas generating powder is ignited. The ignition powder box 108 can not be broken by the ignition powder explosion, has the pressure maintaining function, is more beneficial to the ignition powder to complete the instant explosion, and improves the reliability of the safety airbag.

In one embodiment, as shown in fig. 1 and 4, the gas generator 100 further includes:

End cap 110, end cap 110 is provided on top of filter 106, and the top of ignition cartridge 108 is provided with a support 183, support 183 supporting end cap 110.

The end cover 110 is manufactured by a sheet metal process, the edge of the end cover 110 is provided with a flanging, the end cover 110 is pressed into the filter 106 through interference fit, and the flanging structure after the end cover 110 is pressed into the filter 106 ensures that the end cover 110 is not easy to deform and is difficult to break away from the filter 106, so that residues after the gas-generating medicine burns and explodes are prevented from leaking from the upper end of the filter 106.

In order to prevent the end cap 110 from being pressed too deeply into the filter 106, the top of the ignition cartridge 108 is provided with a supporting portion 183, and the supporting portion 183 can support the end cap 110 to prevent the end cap 110 from going deep, and the supporting portion 183 plays a supporting and positioning role on the end cap 110.

The supporting portion 183 may be formed by bending and deforming the top of the case 181, which is convenient for manufacturing and molding.

In one embodiment, as shown in fig. 1 and 5, the bottom of the housing is provided with a mounting groove 115, and the mounting groove 115 protrudes toward the inner cavity of the housing. The mounting groove 115 may be formed in the middle of the lower case 102 by punching, for mounting the igniter 103, and the igniter 103 will not protrude from the bottom of the outer case after mounting, so as to facilitate mounting and fixing the gas generator 100.

In one embodiment, as shown in fig. 1, the gas generator 100 further comprises:

a base 104, the base 104 being disposed in the mounting groove 115;

The bottom of the fixed ring 105, the ignition medicine box 108 is fixedly connected with the fixed ring 105, and the fixed ring 105 is fixedly connected with the base 104.

The bottom end of the ignition cartridge 108 may be connected to the retaining ring 105 with an interference fit.

The base 104 may be an injection-molded part, and is fixed in the mounting groove 115 through injection molding, so that the fixing is firm and has sealing performance, the top end of the base 104 extends upwards into the inner ring space of the filter 106, and the fixing ring 105 can be in interference fit connection with the top end of the base 104.

In one embodiment, the gas generator 100 further comprises:

The igniter 103, the igniter 103 is disposed in the base 104 and connected to the ignition charge reservoir 109, and the igniter 103 is energized to initiate the ignition charge reservoir 109.

The ignition tool 103 is provided with a wire which is externally connected with a control device, and when the vehicle collides, the control device controls the ignition tool 103 to be electrified (reference values: 2V, 1.2A) to detonate the ignition powder cartridge 109.

In one embodiment, the second wall 114 of the housing is provided with a plurality of first exhaust holes 111 of different heights, for example, with two upper and lower turns of the first exhaust holes 111;

The first wall 161 of the filter 106 is provided with a plurality of flow guiding parts 162 having different heights corresponding to the first exhaust hole 111, for example, two upper and lower rings of flow guiding parts 162 are provided, as shown in fig. 6.

Embodiments of the present utility model also provide an airbag comprising an airbag, and further comprising a gas generator 100 as described in any of the above embodiments, the gas generator 100 being connected to the airbag.

When the vehicle collides, the gas generator 100 can instantaneously ignite and explode to generate an explosion gas flow, and the explosion gas flow is filtered and cooled and then enters the gas bag, so that the gas bag breaks through the pad to be rapidly unfolded in a very short time, an elastic gas cushion is formed at the front and/or the side of a driver or an occupant, and timely leaks and contracts to absorb impact energy, thereby effectively protecting the head and the chest of a human body from injury or reducing the injury degree.

Embodiments of the utility model also provide a vehicle comprising an airbag according to any of the above embodiments.

The number of air bags in a vehicle is typically 1-2, typically one in each of the driving and co-driving positions of the vehicle, to protect the front occupants from chest and brain during a hard crash of the vehicle.

In addition to two at the driving and co-driving positions, two air bags can be arranged in the side vehicle door of the vehicle, so that strong impact force from the front and the side is effectively buffered.

The airbag may be provided at other positions of the vehicle as needed, for example, corresponding to the knees and head of the driver.

According to the filter, the gas generator, the safety airbag and the vehicle, compared with the prior art, the filter, the gas generator, the safety airbag and the vehicle have the following characteristics:

1. The cavity flow guiding structure is changed into a concave flow guiding structure.

The purpose of design like this is more stable for letting water conservancy diversion structure, and gaseous can be according to the structure adjustment flow direction of filter when passing through this kind of structure, and to the air current guide, the filtration route is longer, guarantees that the filter is difficult to by puncture, does not change the interior pressure of filter moreover, and the security improves greatly.

2. Increasing the distance between the housing vent and the filter.

The purpose of filter is the cooling filter residue, increases the distance of shell exhaust hole and filter from the structure, and gaseous when discharging the shell exhaust hole, cooling distance is longer, and the cooling effect is better, and the temperature of flame and residue is lower.

3. The 'medicament innovation' is changed into 'structural realization'.

The design has the advantages that the harsh requirements of the gas generator on the medicament are reduced, the development difficulty of the medicament is far greater than that of the structural transformation, the formulation of the medicament is often required to be innovated and created for obtaining different gas production performance, and the structural transformation in the application can realize the breakthrough of achieving the medicament performance by utilizing the structural transformation, so that the economical efficiency is greatly improved.

The processes, steps described in all the preferred embodiments described above are examples only. Unless adverse effects occur, various processing operations may be performed in an order different from that of the above-described flow. The step sequence of the above-mentioned flow can also be added, combined or deleted according to the actual requirement.

In understanding the scope of the present utility model, the term "comprising" and its derivatives, as used herein, are intended to be open ended terms that specify the presence of the stated features, elements, components, groups, integers, and/or steps, but do not exclude the presence of other unstated features, elements, components, groups, integers and/or steps. This concept also applies to words having similar meanings such as the terms "including", "having" and their derivatives.

The terms "attached" or "attached" as used herein include: a construction in which an element is directly secured to another element by directly securing the element to the other element; a configuration for indirectly securing an element to another element by securing the element to an intermediate member, which in turn is secured to the other element; and the construction in which one element is integral with another element, i.e., one element is substantially part of the other element. The definition also applies to words having similar meanings such as the terms, "connected," "coupled," "mounted," "adhered," "secured" and their derivatives. Finally, terms of degree such as "substantially", "about" and "approximately" as used herein mean a deviation of the modified term such that the end result is not significantly changed.

Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model pertains. The terminology used herein is for the purpose of describing particular implementations only and is not intended to be limiting of the utility model. Features described herein in one embodiment may be applied to another embodiment alone or in combination with other features unless the features are not applicable or otherwise indicated in the other embodiment.

The present utility model has been described in terms of the above embodiments, but it should be understood that the above embodiments are for purposes of illustration and description only and are not intended to limit the utility model to the embodiments described. In addition, it will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that many variations and modifications may be made in accordance with the teachings of the present utility model, which fall within the scope of the claimed utility model.

Claims (22)

1. A filter, comprising:

-a first wall (161), said first wall (161) being for filtering a gas flow;

The first wall (161) comprises a flow guiding portion (162), the flow guiding portion (162) having a porosity smaller than a porosity of a portion of the first wall (161) not being the flow guiding portion (162), the flow guiding portion (162) being adapted to correspond to a first vent hole location on a housing of the gas generator.

2. The filter according to claim 1, wherein the first wall (161) has a multi-layer structure provided with a plurality of ventilation holes to allow gas to pass through the first wall (161), and the thickness of the flow guiding portion (162) is smaller than that of a portion of the first wall (161) other than the flow guiding portion (162).

3. The filter of claim 2, wherein the average gap distance from layer to layer of the multilayer structure at the flow guide (162) is a first gap distance;

The average gap distance from layer to layer of the multilayer structure of the portion other than the flow guide portion (162) is a second gap distance;

The first gap distance is less than the second gap distance.

4. The filter according to claim 2, wherein the flow guide (162) forms a groove (113) in the outer surface of the first wall (161).

5. The filter according to claim 4, wherein the flow guide (162) forms a protrusion on the inner surface of the first wall (161).

6. The filter according to claim 2, wherein the flow guide portion (162) is provided in a ring shape, and an annular groove (113) is formed on an outer surface of the first wall (161), and an annular protrusion is formed on an inner surface of the first wall (161).

7. The filter according to claim 1, wherein the first wall (161) is provided with a plurality of ventilation holes, and the ventilation holes of the diversion portion (162) have a smaller pore size than the ventilation holes of the portion of the first wall (161) other than the diversion portion (162).

8. The filter according to claim 1, characterized in that the flow guide (162) is integrally formed with the first wall (161).

9. The filter according to claim 1, wherein the flow guide (162) is V-grooved or U-grooved in axial section of the filter.

10. A gas generator for generating an explosive gas flow, comprising:

A housing comprising a second wall (114), the second wall (114) being provided with a first vent (111);

Further comprising a filter (106) according to any of claims 1-9.

11. The gas generator according to claim 10, wherein the first gas discharge hole (111) corresponds to be within the range of the flow guide portion (162).

12. The gas generator according to claim 11, wherein the point of the outer surface of the flow guide (162) that is the furthest from the second wall (114) in a straight line corresponds to being within the range of the first gas discharge hole (111).

13. The gas generator according to claim 10, wherein the separation between the flow guiding portion (162) and the housing is larger than the separation between the portion of the first wall (161) other than the flow guiding portion (162) and the housing.

14. The gas generator of claim 10, further comprising:

The pressure maintaining ring (112) is arranged on the inner wall of the shell to seal the first exhaust hole (111), and the pressure maintaining ring (112) can be broken through by explosive airflow.

15. The gas generator of claim 10, further comprising:

The ignition medicine box (108), the ignition medicine box (108) is arranged in the inner annular space of the filter (106), and a gas-generating medicine bin (107) is arranged between the ignition medicine box (108) and the first wall (161) of the filter (106).

16. The gas generator of claim 15, further comprising:

The ignition powder medicine bin (109), ignition powder medicine bin (109) set up the inner chamber of ignition powder medicine box (108), be provided with second exhaust hole (182) on box body (181) of ignition powder medicine box (108), the flame that ignition powder medicine bin (109) burning explosion produced can pass through second exhaust hole (182) orientation produce gas medicine bin (107) release.

17. The gas generator of claim 15, further comprising:

The end cover (110), end cover (110) set up the top of filter (106), the top of ignition powder cartridge (108) is provided with supporting part (183), supporting part (183) support end cover (110).

18. The gas generator according to claim 16, characterized in that the bottom of the housing is provided with a mounting groove (115), the mounting groove (115) being recessed towards the inner cavity of the housing;

The device further comprises a base (104), wherein the base (104) is arranged in the mounting groove (115);

The ignition device is characterized by further comprising an ignition device (103), wherein the ignition device (103) is arranged in the base (104) and is connected with the ignition powder bin (109), and the ignition device (103) can be powered on to detonate the ignition powder bin (109).

19. The gas generator of claim 18, further comprising:

The ignition powder box comprises a fixed ring (105), wherein the bottom end of the ignition powder box (108) is fixedly connected with the fixed ring (105), and the fixed ring (105) is fixedly connected with the base (104).

20. The gas generator according to any one of claims 10-19, wherein the second wall (114) is provided with a plurality of first gas discharge holes (111) of different heights;

Each of the first exhaust holes (111) corresponds to the flow guide part (162).

21. An airbag comprising an airbag, further comprising a gas generator according to any one of claims 10-20, said gas generator being connected to said airbag.

22. A vehicle comprising an airbag according to claim 21.