Ejecting assembly and inflating device
By designing the ejector assembly and cooling mechanism, and utilizing the Venturi effect and cold air mixing, the problems of air volume and structural weight of the gas generator were solved, achieving efficient inflation and cooling effects and reducing costs.
Patent Information
- Application Number
- CN202511909028.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-17
- Publication Date
- 2026-03-10
AI Technical Summary
Existing gas generators require a large amount of medication and a heavy structure to meet the inflation requirements of airbags, resulting in high costs and limiting their application in lightweight and high-performance devices.
The system employs an ejector assembly that utilizes the Venturi effect to introduce cold air and mix it with high-temperature gas. The design of the ejector main tube and branch tubes increases the inflation volume of the airbag, and a cooling mechanism reduces the temperature of the high-temperature gas to prevent damage to the airbag.
Without increasing the amount of propellant in the gas generator, the inflation volume of the airbag can be increased, the weight and cost of the gas generator can be reduced, and the risk of damage to the airbag by high-temperature gas can be reduced.
Smart Images
Figure CN121630816A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of gas generator, in particular to an injection assembly and an inflation device. BACKGROUND
[0002] The gas generator (explosive device) is a key device widely used in airbag inflation system, which generates high-temperature and high-pressure gas instantaneously through chemical reaction, providing power for rapid inflation of airbag. In modern aerospace escape equipment and various emergency protection devices, the gas generator plays a crucial role.
[0003] However, such gas generator generates high-temperature gas during operation, which puts high requirements on the airbag material and structure matched therewith. At the same time, in order to meet the gas amount required for airbag inflation, the gas generator usually needs large amount of medicine and heavy structure, which not only increases the cost, but also limits its application in lightweight and high-performance equipment. SUMMARY
[0004] The purpose of the present application is to overcome the above technical deficiencies, and to provide an injection assembly and an inflation device, which solve the technical problem of high cost due to large amount of medicine and heavy structure of the gas generator in the prior art to meet the demand of airbag inflation amount.
[0005] To achieve the above technical purpose, the present application adopts the following technical scheme: In a first aspect, the present application provides an injection assembly, comprising: an injection main pipe, the injection main pipe being used for connecting an airbag; and a branch pipe, the branch pipe being connected between two ends of the injection main pipe and being capable of driving external air into the injection main pipe when gas flows inside the injection main pipe.
[0006] In some embodiments, the injection main pipe has a first channel inside, the first channel being communicated between two ends of the branch pipe, and the radial cross-sectional area of the first channel decreases in the flow direction of the first channel.
[0007] In some embodiments, the injection main pipe further has a second channel inside, one end of the second channel being connected to the branch pipe and communicated with the first channel, and the other end of the second channel being used for connecting an airbag, the radial cross-sectional area of the second channel increasing in the direction from the first channel to the second channel.
[0008] In some embodiments, the ejector assembly further comprises a one-way valve arranged in the branch pipe, the one-way valve closes the branch pipe when there is no gas flow in the ejector main pipe, and the one-way valve is driven to open the branch pipe by the gas flow when there is gas flow in the ejector main pipe.
[0009] In some embodiments, the number of branch pipes is multiple, and the multiple branch pipes are arranged around the periphery of the ejector main pipe.
[0010] In the second aspect, the application further provides an inflator, comprising an inflator assembly and the above-mentioned ejector assembly, the inflator assembly is connected to the end of the ejector main pipe away from the airbag, and the inflator assembly is used to inflate the ejector main pipe.
[0011] In some embodiments, the inflator assembly comprises a gas generator and a cooling mechanism connected to each other, the cooling mechanism is provided with a flow cavity, the cavity wall of the flow cavity is coated with a high-temperature-resistant material, and the flow cavity is in communication with the gas generator and the ejector main pipe.
[0012] In some embodiments, the cooling mechanism comprises a shell and a first cooling plate, the shell is provided with the flow cavity, the first cooling plate is connected to the cavity wall of the flow cavity, and the first cooling plate is provided with a plurality of through holes.
[0013] In some embodiments, the cooling mechanism further comprises a second cooling plate, the second cooling plate is connected to the cavity wall of the flow cavity, the second cooling plate is provided with a plurality of through holes, and the second cooling plate is arranged in a spaced manner with the first cooling plate.
[0014] In some embodiments, the cooling mechanism further comprises a third cooling plate and a fourth cooling plate, the third cooling plate and the fourth cooling plate are arranged on the top surface and the bottom surface of the second cooling plate respectively, the third cooling plate and the fourth cooling plate are both provided with through holes, and the through holes of the third cooling plate and the fourth cooling plate are in communication with the through holes of the second cooling plate.
[0015] Compared with the prior art, the one end of the ejector main pipe can be used to access the gas generator, the gas generator has a certain amount of gunpowder, the gunpowder can generate a large amount of gas when ignited and combusted and input into the ejector main pipe, when the gas flows in the ejector main pipe, the branch pipe can form a negative pressure through the Venturi principle, the branch pipe can drive the external air into the ejector main pipe, so that the external cold air is mixed with the gas generated by the gas generator, thereby increasing the inflation amount of the air bag, without increasing the amount of gunpowder of the gas generator, the total inflation amount of the air bag is increased, the demand of the air bag inflation is met, the demand of the gunpowder amount and the structure weight of the gas generator is effectively reduced, and the cost is low. In addition, the cold air can reduce the temperature of the high-temperature gas after being mixed with the high-temperature gas generated by the gas generator, so that the air bag can be damaged by high temperature. BRIEF DESCRIPTION OF DRAWINGS
[0016] Figure 1 is a structural schematic diagram of the inflation device provided by the embodiment of the present application; Figure 2 is a cross-sectional schematic diagram of the inflation device provided by the embodiment of the present application. DETAILED DESCRIPTION
[0017] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.
[0018] In order to solve the technical problems that the gas generator needs a large amount of gunpowder and a heavy structure to meet the demand of the air bag inflation amount, and the cost is high in the prior art, the present application provides an ejector assembly and an inflation device, which can realize the mixing of cold air and high-temperature gas through the Venturi effect, increase the air bag inflation amount, reduce the amount of gunpowder of the gas generator, and reduce the gas temperature for the air bag inflation, thereby avoiding the damage of the air bag by high temperature.
[0019] It should be noted that the inflation device described in the present application is used for but not limited to air bag inflation, in order to facilitate the description, in the present application, only the inflation device applied to the air bag inflation is taken as an example for description, and the principle of the inflation device applied to other types of equipment is substantially the same as that applied to the air bag inflation, which is not described here.
[0020] Please refer to Figure 1 and Figure 2 , Figure 1This is a schematic diagram of the inflation device in one embodiment of the present invention. The inflation device includes an inflation assembly 1 and an ejector assembly 2. The ejector assembly 2 includes an ejector main pipe 21 and a branch pipe 22. One end of the ejector main pipe 21 is connected to the inflation assembly 1, and the other end of the ejector main pipe 21 is used to connect to the airbag. The branch pipe 22 connects the two ends of the ejector main pipe 21 and can drive external air into the ejector main pipe 21 when gas flows inside the ejector main pipe 21. In this embodiment, the inflation assembly 1 is mainly used to inflate the ejector main pipe 21 so as to inflate the airbag through the ejector main pipe 21. The inflation assembly 1 has a gas generator 11, which contains gunpowder. After the gunpowder is ignited, the gas generator 11 generates a large amount of high-temperature gas, which is then injected into the airbag after passing through the ejector main pipe 21.
[0021] Branch pipe 22 can be considered a Venturi tube. When the high-temperature gas generated by the gas generator 11 enters the ejector main pipe 21, the high-temperature gas flows rapidly inside the ejector main pipe 21. Through the Venturi effect, the high-temperature gas can drive the branch pipe 22 to form a negative pressure during flow. The branch pipe 22 draws in external cold air into the ejector main pipe 22, which mixes with the high-temperature gas inside the ejector main pipe 22 to increase the inflation volume of the airbag. This increases the total inflation volume of the airbag without increasing the amount of propellant in the gas generator, meeting the airbag inflation requirements, effectively reducing the amount of propellant required by the gas generator and the structural weight, and also reducing costs. In addition, the mixing of cold air and the high-temperature gas generated by the gas generator can effectively reduce the temperature of the high-temperature gas, preventing the airbag from being easily damaged by high temperatures.
[0022] In one embodiment, please refer to Figure 2 The ejector main tube 21 has a first channel 211 inside, with its two ends connected to the inflation assembly 1 and the branch pipe 22, respectively. The radial cross-sectional area of the first channel 211 decreases gradually from the inflation assembly 1 to the branch pipe 22. In this embodiment, the ejector main tube 21 is a gas transmission channel connecting the inflation assembly 1 and the airbag. The two ends of the first channel 211 inside the ejector main tube 21 are connected to the inflation assembly 1 and the branch pipe 22, forming a relatively unique main gas flow channel. The radial cross-sectional area of the first channel 211 gradually decreases from the inflation assembly 1 to the branch pipe 22. The structure of the first channel 211 is based on the Venturi effect, which can significantly increase the gas velocity within the channel, thereby creating a higher negative pressure at the branch pipe 22. This effectively drives external air into the ejector main tube 21, improving the inflation efficiency of the airbag.
[0023] Further, please refer to Figure 2The ejector main pipe 21 also has a second channel 212 inside. One end of the second channel 212 is connected to the branch pipe 22 and communicates with the first channel 211, while the other end of the second channel 212 is used to connect to the airbag. The radial cross-sectional area of the second channel 212 increases from the first channel 211 to the second channel 212. In this embodiment, the larger end of the second channel 212 is connected to the airbag, allowing the mixed gas to flow more stably before entering the airbag, thus improving inflation efficiency. In this embodiment, the ejector main pipe 21 is provided with both the first channel 211 and the second channel 212. The decreasing cross-sectional area of the first channel 211 increases the gas velocity during flow, creating a higher negative pressure at the branch pipe 22, which drives external air into the ejector main pipe 21 more quickly. The increasing cross-sectional area of the second channel 212 stabilizes the flow of the mixed gas, ensuring that the gas reaches its optimal state before entering the airbag.
[0024] By incorporating a first channel 211 and a second channel 212 within the ejector tube 21, external air is introduced using the Venturi effect, and the gas flow and mixing process are optimized through the dual-channel structure. This dual-channel structure not only further improves the charging efficiency and reduces the gas temperature, but also further reduces the propellant requirements of the gas generator.
[0025] In one embodiment, please refer to Figure 2 The ejector assembly 2 also includes a one-way valve 23 located on the branch pipe 22. In this embodiment, the one-way valve 23 is a normally closed valve. When there is no airflow inside the ejector main pipe 21, the one-way valve 23 closes the branch pipe 22 to prevent external air from entering. When there is airflow inside the ejector main pipe 21 and the airflow reaches a certain velocity, the airflow can drive the one-way valve 23 to open the branch pipe 22 through the Venturi effect, ensuring that external cold air is only introduced during the inflation of the airbag, avoiding gas backflow and improving the reliability of the system.
[0026] In one embodiment, please refer to Figure 2 There are multiple branch pipes 22, which are arranged around the periphery of the ejector main pipe 21. Figure 2 The ejector main tube 21 of the embodiment shown is connected to two branch tubes 22. When airflow passes through the ejector main tube 21, the Venturi effect can simultaneously drive multiple branch tubes 22 to draw in external cold air into the ejector main tube 21 and mix it with the high-temperature gas. This not only further increases the intake volume of cold air, but also introduces external air more evenly, further improving the mixing effect and inflation efficiency.
[0027] In one embodiment, please refer to Figure 2The inflation assembly 1 includes a gas generator 11 and a cooling mechanism 12 connected together. The cooling mechanism 12 has a flow chamber 121, the wall of which is coated with a high-temperature resistant material. The flow chamber 121 connects the gas generator 11 and the ejector main pipe 21. In this embodiment, by providing the cooling mechanism 12, preliminary cooling can be performed on the high-temperature gas before it enters the ejector main pipe 21, thereby reducing the thermal impact of the high-temperature gas on the airbag. The main function of the cooling mechanism 12 is to reduce the temperature of the high-temperature gas generated by the gas generator 11, preventing thermal damage to subsequent components (such as the ejector assembly 2 and the airbag). The flow chamber 121 within the cooling mechanism 12 has a wall coated with a high-temperature resistant material, such as alumina or silicon carbide. This material can withstand the impact of high-temperature gas and has good thermal conductivity, which helps to quickly reduce the temperature of the high-temperature gas. The inlet of the flow chamber 121 is connected to the outlet of the gas generator 11 to ensure that the high-temperature gas can smoothly enter the flow chamber 121; the outlet of the flow chamber 121 is connected to the ejector tube 21 to deliver the cooled gas to the ejector assembly 2, and finally input the gas bag through the ejector assembly 2.
[0028] In one embodiment, please refer to Figure 2 The cooling mechanism 12 includes a housing 122 and a first cooling plate 123. A flow cavity 121 is provided inside the housing 122, and the first cooling plate 123 is connected to the wall of the flow cavity 121. The first cooling plate 123 has multiple through holes. When the gas passes through the first cooling plate 123, some heat is absorbed, achieving initial cooling. In this embodiment, the housing 122 is the main structure of the cooling mechanism 12, and the flow cavity 121 is provided inside the housing 122 to accommodate and guide the flow of high-temperature gas. The material of the housing 122 can be selected from metals or alloys with high mechanical strength and high-temperature resistance, such as stainless steel, aluminum alloy, or titanium alloy. These materials can not only withstand the impact of high-temperature gas but also maintain structural stability under complex working conditions.
[0029] The first cooling plate 123 is connected to the wall of the flow chamber 121. Its main function is to absorb heat from the gas through the thermal conductivity of its material, thereby reducing the gas temperature. The material of the first cooling plate 123 is usually a metal with high thermal conductivity and good high-temperature resistance, such as copper, aluminum, or their alloys, to achieve rapid cooling. The first cooling plate 123 has multiple through holes, which allow the high-temperature gas to fully contact the first cooling plate 123 as it passes through, increasing the cooling area of the high-temperature gas and improving the cooling efficiency.
[0030] Further, please refer to Figure 2The cooling mechanism 12 also includes a second cooling plate 124, which is connected to the wall of the flow chamber 121. The second cooling plate 124 has multiple through holes and is arranged parallel to and at intervals from the first cooling plate 123. In this embodiment, the second cooling plate 124 has the same structure and material as the first cooling plate 123, and will not be described in detail here. By adding the second cooling plate 124, the temperature of the high-temperature gas can be further reduced, and the cooling effect can be improved.
[0031] Further, please refer to Figure 2 The cooling mechanism 12 also includes a third cooling plate 125 and a fourth cooling plate 126. The third cooling plate 125 and the fourth cooling plate 126 are respectively disposed on the top and bottom surfaces of the second cooling plate 124. Both the third cooling plate 125 and the fourth cooling plate 126 have through holes, which correspond to and communicate with the through holes in the second cooling plate 124, allowing gas to pass through smoothly. In this embodiment, both the third cooling plate 125 and the fourth cooling plate 126 are made of calcium carbonate. Calcium carbonate is a relatively inexpensive and widely available material, with a cost far lower than that of metals such as copper and aluminum. Using calcium carbonate can significantly reduce material costs. Furthermore, calcium carbonate undergoes a decomposition reaction at high temperatures (CaCO3→CaO+CO2), a process that absorbs a large amount of heat. Therefore, calcium carbonate can act as an effective heat-absorbing material under high-temperature conditions, absorbing some heat through a chemical reaction to achieve a cooling effect. This embodiment, through the synergistic effect of multiple cooling plates, can more effectively reduce the gas temperature, ensuring that the temperature of the high-temperature gas finally entering the airbag is within a safe range.
[0032] In one embodiment, please refer to Figure 2 The flow chamber 121 has multiple air outlets 121a, and multiple ejector components 2 are also present, with each ejector component 2 corresponding to one of the multiple air outlets 121a. In this embodiment, the number of air outlets 121a and the number of ejector components 2 are the same and correspond one-to-one, and the specific number is not limited. In this embodiment, both the number of air outlets 121a and the number of ejector components 2 are two, located on both sides of the flow chamber 121. The two ejector components 2 are arranged side by side, with the gas outlets facing the same side, to facilitate simultaneous connection to the airbag. The airflow in the flow chamber 121 can simultaneously flow into the two ejector components 2 through the two air outlets 121a. The two ejector components 2 can share the air pressure in the flow chamber 121, preventing excessive air pressure in the flow chamber 121 from causing safety hazards. In addition, inflating the airbag through the two ejector components 2 can improve the inflation efficiency.
[0033] To better understand this invention, the following is combined with... Figures 1 to 2 The technical solution of the present invention will be described in detail below: During operation, the gas generator 11 in the inflation assembly 1 ignites and burns, generating a large amount of high-temperature gas. After being cooled by the cooling mechanism 12, the high-temperature gas enters the first channel 211 of the ejector main pipe 21 through the flow chamber 121. Since the radial cross-sectional area of the first channel 211 decreases from the inflation assembly 1 to the branch pipe 22, the gas velocity gradually increases during flow. According to the Venturi effect, a high negative pressure is formed at the branch pipe 22, thereby driving external air through the branch pipe 22 into the ejector main pipe 21. After the external cold air mixes with the high-temperature gas generated by the gas generator, the high-temperature gas is further cooled, and the total inflation volume of the airbag increases. Finally, it enters the airbag through the second channel 212, completing the inflation process. This invention, through the Venturi effect, not only further reduces the temperature of the high-temperature gas but also increases the inflation volume of the airbag.
[0034] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.
Claims
1. An ejector assembly comprising: The ejector assembly comprises: an ejector main pipe for connecting the air bag; and branch pipes connected between two ends of the ejector main pipe and capable of driving external air into the ejector main pipe when gas flows inside the ejector main pipe.
2. The ejector assembly of claim 1, wherein The ejector main pipe has a first channel inside, which is connected between two ends of the branch pipes and has a decreasing radial cross-sectional area in the direction of gas flow.
3. The ejector assembly of claim 2, wherein, The ejector main pipe also has a second channel inside, one end of which is connected to the branch pipes and communicates with the first channel, and the other end of which is used for connecting the air bag, and the radial cross-sectional area of the second channel increases in the direction from the first channel to the second channel.
4. The ejector assembly of claim 1, wherein The ejector assembly also comprises a one-way valve arranged in the branch pipe, which closes the branch pipe when there is no gas flow inside the ejector main pipe, and the gas flow can drive the one-way valve to move to open the branch pipe when there is gas flow inside the ejector main pipe.
5. The ejector assembly of claim 1, wherein The number of branch pipes is multiple, and multiple branch pipes are arranged around the periphery of the ejector main pipe.
6. An inflator device comprising an inflator assembly and the ejector assembly according to any one of claims 1-5, the inflator assembly being connected to one end of the ejector main pipe away from the air bag, and the inflator assembly being used to inflate the ejector main pipe.
7. An inflator device according to claim 6, wherein The inflator assembly comprises a gas generator and a cooling mechanism connected together, the cooling mechanism is provided with a flow cavity inside, the cavity wall of the flow cavity is coated with a high-temperature-resistant material, and the flow cavity communicates with the gas generator and the ejector main pipe.
8. An inflator device according to claim 7, wherein The cooling mechanism comprises a shell and a first cooling plate, the shell is provided with the flow cavity inside, the first cooling plate is connected to the cavity wall of the flow cavity, and the first cooling plate is provided with a plurality of through holes.
9. An inflator device according to claim 8, wherein The cooling mechanism also comprises a second cooling plate, the second cooling plate is connected to the cavity wall of the flow cavity, the second cooling plate is provided with a plurality of through holes, and the second cooling plate is arranged in a spaced manner with the first cooling plate.
10. An inflator according to claim 9, wherein The cooling mechanism also comprises a third cooling plate and a fourth cooling plate, the third cooling plate and the fourth cooling plate are arranged on the top surface and the bottom surface of the second cooling plate respectively, the third cooling plate and the fourth cooling plate are both provided with through holes, and the through holes of the third cooling plate and the fourth cooling plate correspond to and communicate with the through holes of the second cooling plate.