A gas generator and a safety airbag

Abstract

The embodiment of the present application provides a gas generator and a safety airbag, and relates to the field of gas generators.The gas generator comprises an upper shell, a lower shell, a filter screen and a blocking piece, the upper shell is provided with an exhaust hole, the lower shell is connected with the upper shell, and the lower shell and the upper shell form a combustion chamber, the exhaust hole is communicated with the combustion chamber, the filter screen is arranged in the combustion chamber, the filter screen is in abutment with the upper shell and the lower shell at the same time, and the filter screen covers the exhaust hole, the upper shell and the filter screen and the lower shell and the filter screen are both provided with the blocking piece, and the blocking piece is used for blocking the upper gap formed between the upper shell and the filter screen and the lower gap formed between the lower shell and the filter screen in the case that the upper shell and the lower shell are deformed.The blocking piece can form the blocking in the positions of the upper gap and the lower gap, the gas and the residue in the combustion chamber are prevented from leaking from the upper gap and the lower gap, the amount of the residue flowing out from the side is effectively reduced, and the anti-leakage effect is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of gas generators, in particular, to a gas generator and a safety airbag. BACKGROUND

[0002] The gas generator is a gas supply component of the automobile passive safety airbag device, which provides non-injurious gas when the safety airbag device functions, ensures the integrity of the airbag, and provides protection for the driver or passenger. In general, when a cylindrical filter screen is used to build a combustion chamber, the filter screen filters the residues flowing through it, but after the gas generator starts, the top and bottom shells deform, the filter screen shifts, and the upper and lower end faces of the filter screen and the top and bottom of the shell have gaps. Residues directly reach the gas outlet holes provided on the shell from the area between the outside of the filter screen and the inside of the shell, which damages the airbag.

[0003] The prior art leakage prevention device has the problems of poor leakage prevention effect and reduced effective utilization rate of the filter screen. SUMMARY

[0004] The present application provides a gas generator and a safety airbag, which can effectively prevent gas and residues from leaking from the gap between the shell and the filter screen, improve the leakage prevention effect, and will not affect the utilization rate of the filter screen, and has better use effect.

[0005] Embodiments of the present application can be implemented as follows:

[0006] Embodiments of the present application provide a gas generator, which comprises:

[0007] an upper shell, the upper shell being provided with a gas outlet hole;

[0008] a lower shell, the lower shell being connected with the upper shell, and the lower shell and the upper shell forming a combustion chamber, the gas outlet hole being in communication with the combustion chamber;

[0009] a filter screen, the filter screen being arranged in the combustion chamber, the filter screen being in abutment with the upper shell and the lower shell at the same time, and the filter screen covering the gas outlet hole; and

[0010] a blocking piece, the blocking piece being arranged between the upper shell and the filter screen and between the lower shell and the filter screen, the blocking piece being used to block an upper gap formed between the upper shell and the filter screen and a lower gap formed between the lower shell and the filter screen in the case that the upper shell and the lower shell deform.

[0011] Optionally, the blocking member has a blocking surface for blocking an upper gap between the upper shell and the filter screen and a lower gap between the lower shell and the filter screen when the upper shell and the lower shell are deformed.

[0012] Optionally, the blocking surface is a flat surface and / or an inclined surface and / or an arc surface and / or a zigzag surface.

[0013] Optionally, the blocking member comprises an upper blocking member and a lower blocking member, the upper blocking member is integrally formed with the upper shell, and the lower blocking member is integrally formed with the lower shell.

[0014] Optionally, the upper blocking member comprises an upper supporting portion and an upper abutting portion, the upper supporting portion and the upper abutting portion are connected, the blocking surface is arranged on the upper abutting portion and is arranged in a direction away from the lower shell, and an outer surface of the filter screen is provided with a first protrusion, the upper abutting portion and the first protrusion abut.

[0015] Optionally, the blocking member comprises an upper cover and a lower blocking member, the upper cover is arranged in the combustion chamber, the upper cover and a top end of the filter screen are connected, the upper cover is used for blocking a gap between the upper shell and the filter screen when the upper shell is deformed, the lower blocking member is integrally formed with the filter screen, and the lower blocking member is used for blocking a gap between the lower shell and the filter screen when the lower shell is deformed.

[0016] Optionally, the lower blocking member comprises a lower supporting portion and a lower abutting portion, the lower supporting portion and the lower abutting portion are arranged in a spaced manner, the blocking surface is arranged on the lower abutting portion and the lower supporting portion respectively, the blocking surface is arranged in a direction away from the upper shell, and an end portion of the lower supporting portion and an end portion of the lower abutting portion abut the lower shell.

[0017] Optionally, the blocking member comprises a blocking ring, the blocking ring is sleeved on an outer portion of the filter screen, the upper shell and the lower shell abut the blocking ring, and the blocking ring is used for blocking an upper gap between the upper shell and the filter screen and a lower gap between the lower shell and the filter screen when the upper shell and the lower shell are deformed.

[0018] Optionally, an outer surface of the blocking ring is outwardly convexly provided with a flow blocking portion, and the blocking surface is arranged on the flow blocking portion.

[0019] Embodiments of the present application also provide a safety airbag, comprising a gas bag and a gas generator, the gas generator is arranged in the interior of the gas bag.

[0020] The gas generator and the safety airbag of the embodiments of the present application have the following advantages, for example:

[0021] The gas generator comprises an upper shell, a lower shell, a filter screen and a blocking piece, the upper shell is provided with an exhaust hole, the lower shell is connected with the upper shell, and the lower shell and the upper shell form a combustion chamber, the exhaust hole and the combustion chamber are communicated, the filter screen is arranged in the combustion chamber, the filter screen abuts against the upper shell and the lower shell at the same time, and the filter screen covers the exhaust hole, the blocking piece is arranged between the upper shell and the filter screen and between the lower shell and the filter screen, and the blocking piece is used for blocking an upper gap formed between the upper shell and the filter screen and a lower gap formed between the lower shell and the filter screen in the case that the upper shell and the lower shell are deformed. In use, the blocking piece is arranged between the upper shell and the filter screen and between the lower shell and the filter screen, the upper shell and the lower shell are deformed after the gas generator is started, so that the upper gap is formed between the upper shell and the filter screen, and the lower gap is formed between the lower shell and the filter screen, the blocking piece can block the positions of the upper gap and the lower gap, the gas and residues in the combustion chamber are prevented from leaking from the upper gap and the lower gap, the amount of residues flowing out from the side is effectively reduced, the damage to the gas bag is reduced, the anti-leakage effect is improved, and meanwhile, the blocking piece does not affect the utilization rate of the filter screen, and the use effect is better.

[0022] The safety airbag comprises a gas bag and a gas generator, and the gas generator is arranged in the inside of the gas bag. In use, the blocking piece is arranged between the upper shell and the filter screen and between the lower shell and the filter screen, the upper shell and the lower shell are deformed after the gas generator is started, so that the upper gap is formed between the upper shell and the filter screen, and the lower gap is formed between the lower shell and the filter screen, the blocking piece can block the positions of the upper gap and the lower gap, the gas and residues in the combustion chamber are prevented from leaking from the upper gap and the lower gap, the amount of residues flowing out from the side is effectively reduced, the damage to the gas bag is reduced, the anti-leakage effect is improved, and meanwhile, the blocking piece does not affect the utilization rate of the filter screen, and the use effect is better. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0024] Figure 1 The structural schematic diagram of the first embodiment of the gas generator provided for the present embodiment;

[0025] Figure 2 The structural schematic diagram of the first embodiment of the gas generator provided for the present embodiment when deformed;

[0026] Figure 3Fig. 1 is a structural schematic view of a first perspective of a second embodiment of a gas generator according to the present embodiment;

[0027] Figure 4 Fig. 2 is a structural schematic view of a second perspective of the second embodiment of the gas generator according to the present embodiment;

[0028] Figure 5 Fig. 3 is a structural schematic view of a third embodiment of the gas generator according to the present embodiment.

[0029] Fig. 1 is a structural schematic view of a first perspective of a second embodiment of a gas generator according to the present embodiment; DETAILED DESCRIPTION

[0030] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0032] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0033] In the description of the present application, it should be noted that if the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present application is used, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the present application.

[0034] In addition, if the terms "first", "second" and the like are used herein, they are merely used to distinguish one entity from another, and do not imply a relative importance.

[0035] It should be noted that the features in the embodiments of the present application can be combined with each other without conflict.

[0036] The gas generator is a gas supply component of the automobile passive safety airbag device, which provides non-harmful gas when the safety airbag device functions, ensures the integrity of the airbag, and provides protection for the driver or passenger. In general, when a cylindrical filter screen is used to build a combustion chamber, the filter screen filters the residues flowing through it, but after the gas generator is started, the top and bottom shells deform, the filter screen shifts, and the upper and lower end faces of the filter screen and the top and bottom of the shell form gaps. Residues directly reach the gas outlet holes provided on the shell from the area outside the filter screen and inside the shell through these gaps, which damages the airbag.

[0037] The anti-leakage device in the related art has the problems of poor anti-leakage effect and reduced effective utilization rate of the filter screen.

[0038] Please refer to Figures 1-5 The safety airbag provided in the embodiment includes a gas bag and a gas generator 100, and the gas generator is arranged inside the gas bag. The safety airbag can effectively improve the technical problems mentioned above. It can effectively prevent gas and residues from leaking from the gap between the shell and the filter screen 30, improve the anti-leakage effect, and at the same time, will not affect the utilization rate of the filter screen 30, and the use effect is better.

[0039] Specifically, the gas generator 100 includes an igniter 50 and a gas generating agent 60. After the gas generator 100 is started, the igniter 50 ignites the gas generating agent 60 to generate a large amount of gas and residues, the internal pressure of the gas generator 100 increases, and most of the gas enters the gas bag through the gas generator 100 to fill it, so that the gas bag expands.

[0040] Please refer to Figures 1-5 The gas generator 100 provided in the embodiment includes an upper shell 10, a lower shell 20, a filter screen 30, and a blocking piece 40. The upper shell 10 is provided with an exhaust hole 11. The lower shell 20 is connected with the upper shell 10, and the lower shell 20 and the upper shell 10 form a combustion chamber. The exhaust hole 11 and the combustion chamber are in communication. The filter screen 30 is arranged in the combustion chamber, and the filter screen 30 abuts against the upper shell 10 and the lower shell 20 at the same time. The filter screen 30 covers the exhaust hole 11. The blocking piece 40 is arranged between the upper shell 10 and the filter screen 30 and between the lower shell 20 and the filter screen 30. The blocking piece 40 is used to block the upper gap 101 formed between the upper shell 10 and the filter screen 30 and the lower gap 102 formed between the lower shell 20 and the filter screen 30 in the case that the upper shell 10 and the lower shell 20 deform.

[0041] Specifically, in the prior art, after the gas generator is started, the internal pressure of the gas generator increases, causing the upper shell and the lower shell to deform and form gaps at both ends of the filter screen, and the gas with residues leaks from the gaps into the gas bag, thereby damaging the gas bag. To solve this technical problem, the gas generator 100 provided in the embodiment is provided with a blocking piece 40 between the upper shell 10 and the filter screen 30 and between the lower shell 20 and the filter screen 30 when in use. After the gas generator 100 is started, the upper shell 10 and the lower shell 20 deform, forming an upper gap 101 between the upper shell 10 and the filter screen 30 and a lower gap 102 between the lower shell 20 and the filter screen 30. The blocking piece 40 can block the upper gap 101 and the lower gap 102, preventing the gas in the combustion chamber from leaking from the upper gap 101 and the lower gap 102, effectively reducing the amount of residues flowing out from the side, reducing damage to the gas bag, improving the anti-leakage effect, and at the same time, the blocking piece 40 does not affect the utilization rate of the filter screen 30, and the use effect is better.

[0042] In the embodiment, the exhaust hole 11 is covered with a sealing foil 70.

[0043] Specifically, the top end of the filter screen 30 abuts against the upper shell 10, and the bottom end of the filter screen 30 abuts against the lower shell 20. After the upper shell 10 and the lower shell 20 deform, the top end of the filter screen 30 and the upper shell 10 form an upper gap 101, and the bottom end of the filter screen 30 and the lower shell 20 form a lower gap 102.

[0044] In the embodiment, the blocking piece 40 has a blocking surface 401 for blocking the upper gap 101 formed between the upper shell 10 and the filter screen 30 and the lower gap 102 formed between the lower shell 20 and the filter screen 30 when the upper shell 10 and the lower shell 20 deform. The blocking surface 401 can block the gas with residues from passing through the upper gap 101 or the lower gap 102 and apply a reverse force to the gas, causing the gas to flow in the opposite direction.

[0045] It should be noted that the blocking surface 401 is a flat surface and / or an inclined surface and / or an arc surface and / or a zigzag surface.

[0046] Figures 1-2 The structure diagram of the first embodiment of the blocking piece 40 is shown, and the blocking piece 40 of the embodiment will be described in detail below.

[0047] Please refer to Figure 1 and Figure 2 The blocking piece 40 includes an upper blocking piece 41 and a lower blocking piece 42. The upper blocking piece 41 is integrally formed with the upper shell 10, and the lower blocking piece 42 is integrally formed with the lower shell 20.

[0048] In the present embodiment, the upper barrier 41 comprises an upper supporting portion 411 and an upper abutting portion 412, the upper supporting portion 411 and the upper abutting portion 412 are connected, the blocking surface 401 is arranged on the upper abutting portion 412 and is arranged towards the direction away from the lower shell 20, the upper supporting portion 411 can support the shape of the blocking surface 401, the outer surface of the filter screen 30 is provided with a first protrusion, and the upper abutting portion 412 and the first protrusion abut. Specifically, the first protrusion is arranged on the outer side wall of the filter screen 30.

[0049] Specifically, the first protrusion is arranged at the position close to the top end of the filter screen 30, the first protrusion and the upper abutting portion 412 abut, in the case that the upper shell 10 is deformed to deform upwards (F in the figure is the force of the upper shell 10 deformed upwards), the first protrusion abuts against the upper abutting portion 412 downwards, so that the upper abutting portion 412 and the first protrusion always abut together, thereby forming a block between the upper gap 101 and the exhaust hole 11, avoiding the gas with residues from the upper gap 101 leaking into the exhaust hole 11.

[0050] More, the upper abutting portion 412 can also limit the displacement of the filter screen 30, ensuring that the top end of the filter screen 30 can still abut against the upper shell 10 after the gas generator 100 is started, and the upper gap 101 is not formed.

[0051] It also needs to be explained that the upper supporting portion 411 and the upper abutting portion 412 are arranged at an angle, and the connection between the upper supporting portion 411 and the upper abutting portion 412 abuts against the first protrusion.

[0052] Similarly, the lower barrier 42 comprises a lower supporting portion 421 and a lower abutting portion 422, the lower supporting portion 421 and the lower abutting portion 422 are connected and arranged at an angle, the blocking surface 401 is arranged on the lower abutting portion 422 and is arranged towards the direction away from the upper shell 10, the lower supporting portion 421 can support the shape of the blocking surface 401, the filter screen 30 is provided with a second protrusion at the position close to the bottom end, and the second protrusion and the lower abutting portion 422 abut. Specifically, the second protrusion is arranged on the outer side wall of the filter screen 30.

[0053] In the case that the lower shell 20 is deformed to deform downwards (F in the figure is the force of the lower shell 20 deformed downwards), the second protrusion abuts against the lower abutting portion 422 upwards, so that the lower abutting portion 422 and the second protrusion always abut together, thereby forming a block between the lower gap 102 and the exhaust hole 11, avoiding the gas with residues from the lower gap 102 leaking into the exhaust hole 11.

[0054] After the gas generator 100 is started, the igniter 50 ignites the gas generating agent 60 to generate a large amount of gas and residues, the pressure in the gas generator 100 increases, most of the gas is filtered through the filter screen 30 and then enters the airbag through the exhaust hole 11, at this time, the upper shell 10 and the lower shell 20 are deformed under the action of the pressure, so that the two ends of the filter screen 30 form an upper gap 101 and a lower gap 102 between the upper shell 10 and the lower shell 20 respectively, the upper abutting portion 412 and the lower abutting portion 422 of the blocking piece 40 abut with the filter screen 30 respectively, forming a block on the side of the gas generator 100 while avoiding the displacement of the filter screen 30 in the axial direction, so that the filter screen 30 always abuts with the upper shell 10 and the lower shell 20, forcing the gas flowing to the side to directly impact the blocking surface 401, and the gas is intercepted by the blocking surface 401 and then diverted, thereby guiding the gas to the filter screen 30 for filtration and finally entering the exhaust hole 11. The gas generator 100 can maximize the effective utilization rate of the filter screen 30, while intercepting the gas flowing to the upper gap 101 and the lower gap 102, effectively reducing the amount of residues flowing from the side, reducing the damage to the airbag, and improving the anti-leakage effect.

[0055] Figures 3-4 The structural schematic diagram of the second embodiment of the blocking piece 40 is shown, and the blocking piece 40 of this embodiment will be described in detail below.

[0056] Please refer to Figure 3 and Figure 4 , the blocking piece 40 includes an upper cover 43 and a lower blocking piece 42, the upper cover 43 is arranged in the combustion chamber, and the upper cover 43 is connected with the top end of the filter screen 30, the upper cover 43 is used to block the gap formed between the upper shell 10 and the filter screen 30 in the case of deformation of the upper shell 10, and the lower blocking piece 42 is integrally formed with the filter screen 30, and the lower blocking piece 42 is used to block the gap formed between the lower shell 20 and the filter screen 30 in the case of deformation of the lower shell 20.

[0057] In this embodiment, the lower blocking piece 42 includes a lower supporting portion 421 and a lower abutting portion 422, the lower supporting portion 421 and the lower abutting portion 422 are arranged at intervals, the blocking surface 401 is arranged on the lower abutting portion 422 and the lower supporting portion 421 respectively, and the blocking surface 401 is arranged in a direction away from the upper shell 10, and the end of the lower supporting portion 421 and the end of the lower abutting portion 422 both abut with the lower shell 20.

[0058] Specifically, the lower abutting portion 422 and the lower supporting portion 421 are both arranged on the outer side wall of the filter screen 30.

[0059] In the present embodiment, the lower abutting portion 422 and the lower supporting portion 421 can intercept the gas flowing to the lower gap 102 multiple times, and in the case that the upper shell 10 and the lower shell 20 are deformed upward and downward respectively (F in the figure is the force acting on the upper shell 10 to deform upward and the force acting on the lower shell 20 to deform downward respectively), the upper cover 43 forms a blockage at the upper gap 101 to intercept the gas flowing to the upper gap 101. The lower abutting portion 422 and the lower supporting portion 421 form multiple levels of blockage to intercept the gas flowing to the lower gap 102.

[0060] Please refer to Figure 4 The number of the lower abutting portion 422 and the lower supporting portion 421 is multiple, and the multiple lower abutting portions 422 are arranged at intervals in the circumferential direction, and the multiple lower supporting portions 421 are arranged at intervals in the circumferential direction.

[0061] The lower abutting portion 422 and the lower supporting portion 421 form a drainage channel 103, so that the gas with residues is diverted after impacting the blocking surface 401 of the lower abutting portion 422 and the lower supporting portion 421, thereby guiding the gas to the filter screen 30 for filtration.

[0062] After the gas generator 100 is started, the igniter 50 ignites the gas generating agent 60 to generate a large amount of gas and residues, the internal pressure of the gas generator 100 increases, most of the gas is filtered through the filter screen 30, and then enters the gas bag through the exhaust hole 11. At this time, the upper shell 10 and the lower shell 20 are deformed under the action of pressure, so that the two ends of the filter screen 30 form an upper gap 101 and a lower gap 102 between the upper shell 10 and the lower shell 20 respectively, and the upper cover 43 is sleeved on the top end of the filter screen 30 to block the risk of gas leakage from the upper gap 101. When the gas flows to the lower gap 102, the lower abutting portion 422 and the lower supporting portion 421 abut against the inner side wall of the lower shell 20, forming a blockage on the side of the gas generator 100 while avoiding the displacement of the filter screen 30 in the axial direction, so that the filter screen 30 always abuts against the lower shell 20, forcing the gas flowing to the side to directly impact the blocking surface 401 of the lower supporting portion 421 to achieve the first level of flow resistance. After being intercepted by the blocking surface 401, the gas is diverted to impact the blocking surface 401 of the lower abutting portion 422 again through the drainage channel 103 to achieve the second level of flow resistance, forcing the gas to be diverted again and finally guided to the filter screen 30 for filtration, and then entering the exhaust hole 11.

[0063] Figure 5 The structure diagram of the third embodiment of the blocking piece 40 is shown, and the blocking piece 40 of the embodiment will be described in detail below.

[0064] Please refer to Figure 5The blocking piece 40 comprises a blocking ring 44 sleeved outside the filter screen 30, and the upper shell 10 and the lower shell 20 are both abutted with the blocking ring 44, which is used to block the upper gap 101 between the upper shell 10 and the filter screen 30 and the lower gap 102 between the lower shell 20 and the filter screen 30 in the case that the upper shell 10 and the lower shell 20 are deformed.

[0065] In the embodiment, the outer surface of the blocking ring 44 is outwardly convexly provided with a flow blocking part 45, and the blocking surface 401 is arranged on the flow blocking part 45. The flow blocking part 45 is abutted with the inner side wall of the lower shell 20 or the upper shell 10, thereby intercepting the gas.

[0066] Furthermore, the top end and the bottom end of the blocking ring 44 are both provided with clamping grooves connected with the top end and the bottom end of the filter screen 30 respectively.

[0067] After the gas generator 100 is started, the igniter 50 ignites the gas generating agent 60 to generate a large amount of gas and residues, the internal pressure of the gas generator 100 is increased, most of the gas is filtered through the filter screen 30 and then enters the gas bag through the exhaust hole 11. At this time, the upper shell 10 and the lower shell 20 are deformed under the action of the pressure, so that the two ends of the filter screen 30 form the upper gap 101 and the lower gap 102 with the upper shell 10 and the lower shell 20 respectively. The two ends of the filter screen 30 are clamped with the blocking ring 44. The flow blocking part 45 of the blocking ring 44 arranged at the top end of the filter screen 30 is abutted with the inner side wall of the upper shell 10, and the flow blocking part 45 of the blocking ring 44 arranged at the bottom end of the filter screen 30 is abutted with the inner side wall of the lower shell 20. The two blocking rings 44 block the risk of gas leakage from the upper gap 101 and the lower gap 102 respectively. When the gas flows to the upper gap 101 and the lower gap 102, the flow blocking part 45 forms a block on the side of the gas generator 100 while avoiding the displacement of the filter screen 30 in the axial direction, so that the filter screen 30 is always abutted with the lower shell 20 and the lower shell 20. The gas flowing to the side is forced to directly impact the blocking surface 401 to achieve flow blocking, the gas is forced to change direction and is drained to the filter screen 30 for filtering, and finally enters the exhaust hole 11.

[0068] The gas generator 100 and the safety airbag provided in the embodiment have at least the following advantages:

[0069] The blocking piece 40 of the gas generator 100 can intercept the gas in the upper gap 101 between the upper shell 10 and the filter screen 30 and the lower gap 102 between the lower shell 20 and the filter screen 30, avoid the gas flowing into the exhaust hole 11 from the side, effectively reduce the amount of residues flowing out from the side, reduce the damage to the airbag, and make the gas generator 100 have better product adaptability.

[0070] In summary, the embodiment of the present application provides a gas generator 100 and a safety airbag, the gas generator 100 comprises an upper shell 10, a lower shell 20, a filter screen 30 and a blocking piece 40, the upper shell 10 is provided with an exhaust hole 11, the lower shell 20 is connected with the upper shell 10, and the lower shell 20 and the upper shell 10 form a combustion chamber, the exhaust hole 11 and the combustion chamber are communicated, the filter screen 30 is arranged in the combustion chamber, the filter screen 30 abuts against the upper shell 10 and the lower shell 20 at the same time, and the filter screen 30 covers the exhaust hole 11, the blocking piece 40 is arranged between the upper shell 10 and the filter screen 30 and between the lower shell 20 and the filter screen 30, and the blocking piece 40 is used for blocking an upper gap 101 formed between the upper shell 10 and the filter screen 30 and a lower gap 102 formed between the lower shell 20 and the filter screen 30 in the case that the upper shell 10 and the lower shell 20 are deformed. When the gas generator 100 is used, the blocking piece 40 is arranged between the upper shell 10 and the filter screen 30 and between the lower shell 20 and the filter screen 30, the upper shell 10 and the lower shell 20 are deformed after the gas generator 100 is started, so that the upper gap 101 is formed between the upper shell 10 and the filter screen 30, and the lower gap 102 is formed between the lower shell 20 and the filter screen 30, the blocking piece 40 can block the positions of the upper gap 101 and the lower gap 102, the gas and residues in the combustion chamber are prevented from leaking from the upper gap 101 and the lower gap 102, the amount of residues flowing from the side is effectively reduced, the damage to the airbag is reduced, the anti-leakage effect is improved, and meanwhile, the blocking piece 40 does not affect the utilization rate of the filter screen 30, and the use effect is better.

[0071] The safety airbag comprises an airbag and the gas generator 100, and the gas generator 100 is arranged in the inside of the airbag. When the gas generator 100 is used, the blocking piece 40 is arranged between the upper shell 10 and the filter screen 30 and between the lower shell 20 and the filter screen 30, the upper shell 10 and the lower shell 20 are deformed after the gas generator 100 is started, so that the upper gap 101 is formed between the upper shell 10 and the filter screen 30, and the lower gap 102 is formed between the lower shell 20 and the filter screen 30, the blocking piece 40 can block the positions of the upper gap 101 and the lower gap 102, the gas and residues in the combustion chamber are prevented from leaking from the upper gap 101 and the lower gap 102, the amount of residues flowing from the side is effectively reduced, the damage to the airbag is reduced, the anti-leakage effect is improved, and meanwhile, the blocking piece 40 does not affect the utilization rate of the filter screen 30, and the use effect is better.

[0072] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A gas generator, characterized in that, include: The upper shell (10) is provided with an exhaust hole (11). The lower shell (20) is connected to the upper shell (10), and the lower shell (20) and the upper shell (10) form a combustion chamber, and the exhaust port (11) is connected to the combustion chamber; A filter screen (30) is disposed in the combustion chamber, the filter screen (30) abuts against both the upper shell (10) and the lower shell (20), and the filter screen (30) covers the exhaust port (11); and A blocking member (40) is provided between the upper shell (10) and the filter screen (30) and between the lower shell (20) and the filter screen (30). The blocking member (40) is used to block the upper gap (101) formed between the upper shell (10) and the filter screen (30) and the lower gap (102) formed between the lower shell (20) and the filter screen (30) when the upper shell (10) and the lower shell (20) are deformed. The blocking member (40) includes an upper blocking member (41) and a lower blocking member (42). The upper blocking member (41) and the upper shell (10) are integrally formed, and the lower blocking member (42) and the lower shell (20) are integrally formed. The upper blocking member (41) includes an upper support portion (411) and an upper abutting portion (412), the upper support portion (411) and the upper abutting portion (412) are connected, the blocking member (40) has a blocking surface (401), the blocking surface (401) is disposed on the upper abutting portion (412) and is disposed in a direction away from the lower shell (20), the outer surface of the filter screen (30) is provided with a first protrusion, and the upper abutting portion (412) abuts against the first protrusion.

2. The gas generator according to claim 1, characterized in that, The blocking surface (401) is used to block the upper gap (101) formed between the upper shell (10) and the filter screen (30) and the lower gap (102) formed between the lower shell (20) and the filter screen (30) when the upper shell (10) and the lower shell (20) are deformed.

3. The gas generator according to claim 2, characterized in that, The blocking surface (401) is a plane and / or an inclined plane and / or an arc surface and / or a tortuous surface.

4. A gas generator, characterized in that, include: The upper shell (10) is provided with an exhaust hole (11). The lower shell (20) is connected to the upper shell (10), and the lower shell (20) and the upper shell (10) form a combustion chamber, and the exhaust port (11) is connected to the combustion chamber; A filter screen (30) is disposed in the combustion chamber, the filter screen (30) abuts against both the upper shell (10) and the lower shell (20), and the filter screen (30) covers the exhaust port (11); and A blocking member (40) is provided between the upper shell (10) and the filter screen (30) and between the lower shell (20) and the filter screen (30). The blocking member (40) is used to block the upper gap (101) formed between the upper shell (10) and the filter screen (30) and the lower gap (102) formed between the lower shell (20) and the filter screen (30) when the upper shell (10) and the lower shell (20) are deformed. The blocking member (40) has a blocking surface (401) which is used to block the upper gap (101) formed between the upper shell (10) and the filter screen (30) and the lower gap (102) formed between the lower shell (20) and the filter screen (30) when the upper shell (10) and the lower shell (20) are deformed. The blocking surface (401) is a plane and / or a slope and / or an arc and / or a tortuous surface; The blocking member (40) includes an upper cover (43) and a lower blocking member (42). The upper cover (43) is disposed in the combustion chamber and is connected to the top of the filter screen (30). The upper cover (43) is used to block the gap formed between the upper shell (10) and the filter screen (30) when the upper shell (10) is deformed. The lower blocking member (42) is integrally formed with the filter screen (30). The lower blocking member (42) is used to block the gap formed between the lower shell (20) and the filter screen (30) when the lower shell (20) is deformed.

5. The gas generator according to claim 4, characterized in that, The lower blocking member (42) includes a lower support portion (421) and a lower abutment portion (422), the lower support portion (421) and the lower abutment portion (422) are spaced apart, the blocking surface (401) is respectively disposed on the lower abutment portion (422) and the lower support portion (421), the blocking surface (401) is disposed in a direction away from the upper shell (10), and the ends of the lower support portion (421) and the lower abutment portion (422) abut against the lower shell (20).

6. A gas generator, characterized in that, include: The upper shell (10) is provided with an exhaust hole (11). The lower shell (20) is connected to the upper shell (10), and the lower shell (20) and the upper shell (10) form a combustion chamber, and the exhaust port (11) is connected to the combustion chamber; A filter screen (30) is disposed in the combustion chamber, the filter screen (30) abuts against both the upper shell (10) and the lower shell (20), and the filter screen (30) covers the exhaust port (11); and A blocking member (40) is provided between the upper shell (10) and the filter screen (30) and between the lower shell (20) and the filter screen (30). The blocking member (40) is used to block the upper gap (101) formed between the upper shell (10) and the filter screen (30) and the lower gap (102) formed between the lower shell (20) and the filter screen (30) when the upper shell (10) and the lower shell (20) are deformed. The blocking member (40) has a blocking surface (401) which is used to block the upper gap (101) formed between the upper shell (10) and the filter screen (30) and the lower gap (102) formed between the lower shell (20) and the filter screen (30) when the upper shell (10) and the lower shell (20) are deformed. The blocking surface (401) is a plane and / or an inclined plane and / or an arc surface and / or a tortuous surface. The blocking member (40) includes a blocking ring (44), which is sleeved on the outside of the filter screen (30), and the upper shell (10) and the lower shell (20) both abut against the blocking ring (44). The blocking ring (44) is used to block the upper gap (101) formed between the upper shell (10) and the filter screen (30) and the lower gap (102) formed between the lower shell (20) and the filter screen (30) when the upper shell (10) and the lower shell (20) are deformed.

7. The gas generator according to claim 6, characterized in that, The outer surface of the blocking ring (44) is provided with a flow-blocking part (45) protruding outward, and the blocking surface (401) is disposed on the flow-blocking part (45).

8. An airbag, characterized in that, It includes an air bag and a gas generator (100) as described in any one of claims 1-3, or a gas generator (100) as described in any one of claims 4-5, or a gas generator (100) as described in any one of claims 6-7, wherein the gas generator (100) is disposed inside the air bag.

Images