CN215693831U - Heat insulation gas generating device - Google Patents

Abstract

The embodiment of the application provides a thermal-insulated gas generator, relates to the gas generator field. The heat-insulating gas generating device comprises a gas generator and a shell covering the outside of the gas generator, the shell comprises an inner shell and an outer shell which are sleeved together, a heat-absorbing phase-change material is filled between the inner shell and the outer shell, and a gap is formed between the gas generator and the shell. The utility model provides a setting synergism in insulating layer and the clearance among the thermal-insulated gas generating device can prevent effectively that the human condition of being scalded by high temperature object from taking place.

Description

Heat insulation gas generating device

Technical Field

The application relates to the field of gas generators, in particular to a heat-insulating gas generating device.

Background

The gas generator releases a large amount of heat during operation, resulting in a high outer shell temperature. In order to improve the safety of the gas generator, a heat insulation structure is required to be added to prevent a human body from being scalded by a shell of the gas generator, at present, a heat insulation material is usually directly coated outside the gas generator, but the heat insulation effect of the method is not good, and the situation that the human body is scalded still occurs.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems existing in the prior art, the embodiment of the application provides a heat-insulating gas generating device which can prevent a human body from being scalded by a gas generator.

The embodiment of the application provides a thermal-insulated gas generator, locate the outside casing of gas generator including gas generator and cover, the casing is established inner shell and shell including the cover together, is filled with the heat absorption phase change material between inner shell and the shell, has the clearance between the inner shell of gas generator and casing.

In the above-mentioned realization process, the heat absorption phase change material can keep the constancy of temperature when absorbing a large amount of heats, and the heat absorption phase change material is filled between the inner shell and the shell of casing, even the heat transfer that gas generator produced to the inner shell of casing, thereby the heat absorption phase change material also can absorb a large amount of heats and stop the rise of the surface temperature of casing to avoid taking place to scald the human condition.

The outer part of the gas generator is covered with the shell, and a gap is arranged between the gas generator and the inner shell of the shell, so that on one hand, the heat generated by the gas generator is difficult to transfer to the shell, the temperature of the shell is difficult to rise, and a human body is only contacted with the shell with low temperature, thereby avoiding the occurrence of scalding; on the other hand, the air flow in the gap can take away the heat generated by the gas generator, thereby reducing the temperature of the gas generator and being beneficial to the heat dissipation of the gas generator. The combined action of the heat absorption phase change material and the gap can ensure that the surface temperature of the heat insulation gas generating device is not too high and the human body is not scalded.

In one possible implementation, the heat-absorbing phase-change material includes a thermal insulation medium and a phase-change material; the heat insulation medium is at least one of expanded vermiculite, vitrified micro bubbles and expanded perlite; the phase-change material is at least one of paraffin, sodium acetate trihydrate, sodium thiosulfate pentahydrate and sodium hydrogen phosphate decahydrate.

In the implementation process, the heat insulation medium has low heat conductivity and poor heat transfer performance, the temperature of the shell can be effectively prevented from rising, and the phase change material can absorb a large amount of heat and can efficiently and quickly cool the shell; the expanded vermiculite, the vitrified micro bubbles and the expanded perlite have low thermal conductivity and are more suitable to be used as materials of heat insulation media; the paraffin, the sodium acetate trihydrate, the sodium thiosulfate pentahydrate and the sodium hydrogen phosphate decahydrate are easily converted into liquid from solid, and the materials can absorb a large amount of heat when the solid is converted into the liquid, so that the temperature of the shell is reduced.

In a possible implementation mode, the shell is tubular, the inner shell and the outer shell of the shell are both tubular structures with openings at two opposite end faces, and the gas generator is embedded in the inner shell.

In the implementation process, the tubular shell can be better adapted to the gas generator, the gas generator can be completely placed in the shell, and the gas generator is embedded in the inner shell, so that the gas generator can be placed in the shell, and the preparation and heat dissipation of the heat-insulating gas generation device are facilitated.

In one possible implementation, the open end of the inner housing is provided with a support bracket for fixing the gas generator.

In the above implementation, the support frame of the inner shell fixes the gas generator relative to the housing.

In a possible realization mode, the structure of the support frame is a cross-shaped structure, the end part of the support frame is propped against the inner shell, and the gas generator is fixed at the intersection of the support frame.

In the implementation process, the end part of the cross-shaped support frame props against the inner shell, the gas generator is fixed at the cross part, the position of the gas generator relative to the shell can be fixed, and meanwhile, the cross-shaped support frame cannot hinder the ventilation effect of the gap.

In a possible implementation mode, the supporting frame is a supporting plate with a hollow part, the edge of the supporting frame is propped against the inner shell, and the gas generator is fixed in the middle of the supporting frame.

In the implementation process, the hollow supporting plate edge supports against the inner shell, the supporting frame is fixed at the middle part, the gas generator can be fixed relative to the shell, and meanwhile, the hollow supporting plate cannot hinder the ventilation effect in the gap.

In a possible implementation mode, two opposite ends of the gas generator are respectively provided with a fixed shaft in a connecting mode, and the fixed shafts respectively penetrate through the supporting frames at the same ends and are fixed with the supporting frames.

In the implementation process, the gas generator can react to generate a large amount of gas quickly, the support frame directly fixed on the gas generator is easy to damage, and the fixed shafts extending out of the two opposite ends of the gas generator are fixed with the support frame, so that the support frame is not easy to damage.

In one possible implementation, the same end edges of the inner and outer shells of the housing are connected together by sealing plates to close the space between the inner and outer shells.

In the implementation process, the sealing plate can seal the inner shell and the outer shell at the same end edge of the shell to form an interlayer structure, and the thermal insulation layer can be prevented from falling off from the inner shell and the outer shell of the shell.

In a possible implementation manner, the two end faces of the inner shell of the shell are closed, and the gas generators are arranged in the shell and are installed on the two end faces of the inner shell.

In the above implementation process, the two end faces of the inner shell of the shell are closed, and the gas generator is arranged along the axis of the shell and is favorable for stabilizing the gas generator.

In a possible implementation, the two end faces of the housing are respectively provided with an air-permeable channel.

In the implementation process, the ventilation channel is beneficial to heat dissipation of the gas generator in the shell.

In one possible implementation, the material of the housing is metal.

In the implementation process, the shell made of metal materials is not easy to deform, so that the structure of the heat-insulating gas generation device is firmer and is not easy to damage.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.

FIG. 1 is a schematic structural view of an insulating gas generating apparatus according to a first embodiment and a second embodiment of the present application;

FIG. 2 is a cross-sectional view taken at A-A' of FIG. 1;

FIG. 3 is a schematic structural view of a housing and a support frame portion of an insulated gas generator according to a first embodiment of the present application;

FIG. 4 is a schematic structural view of a housing and a support frame portion of an insulated gas generator according to a second embodiment of the present application;

FIG. 5 is a schematic structural view of an insulating gas generating apparatus according to a third embodiment of the present application;

fig. 6 is a schematic structural view of the housing and the sealing plate of fig. 5.

Icon: 100-a housing; 110-an inner shell; 120-a thermally insulating layer; 130-a housing; 140-a gas-permeable channel; 200-a gas generator; 210-a fixed shaft; 300-a support frame; 310-hollowed-out holes; 400-sealing plate.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.

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 clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, as presented in the figures, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present application, it should be noted that the terms "center", "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that are conventionally placed when products of the application are used, and are only used for convenience in describing the application and simplifying the description, but do not indicate or imply that the devices or elements to be referred must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the application.

In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the term "connected" is to be interpreted broadly, e.g. as a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

First embodiment

Referring to fig. 1 to 3, the heat-insulating gas generator of the present embodiment includes a housing 100 and a gas generator 200, wherein the housing 100 is tubular and covers the gas generator 200, and two ends of the gas generator 200 are respectively connected to a fixing shaft 210.

The shell 100 is tubular and comprises an inner shell 110 and an outer shell 130 which are sleeved together, the inner shell 110 and the outer shell 130 are both tubular structures with openings on opposite end faces, a heat insulation layer 120 is filled between the inner shell 110 and the outer shell 130, a gap is formed between the inner shell 110 and the gas generator 200 of the shell 100, the gas generator 200 is embedded in the inner shell 110, a support frame 300 is arranged at the opening end part of the inner shell 110, and the support frame 300 is used for fixing the gas generator 200; the same end edges of the inner and outer shells 110 and 130 of the housing 100 are joined together by a sealing plate 400 to form a sealed sandwich structure.

It should be noted that, in the embodiment of the present application, the "gas generator" is generally disposed in an airbag system, when a vehicle collides, gas is rapidly generated in the gas generator 200 to inflate the airbag, and a large amount of heat is generated in the gas generator 200, and the gas generator 200 is generally cylindrical; the gas generator 200 is embedded in the inner case 110 "means that the gas generator 200 is surrounded by the inner case 110; the housing 100 may be a tubular structure such as a square tube or a circular tube, both of which can enable the gas generator 200 to be embedded inside the inner housing 110, the housing 100 in this embodiment is a circular tube, and the inner housing 110 and the outer housing 130 are also circular tubes.

In the present embodiment, the gas generator 200 is disposed along the axis of the housing 100, that is, the gas generator 200 is disposed at the central position in the housing 100, which is favorable for stabilizing the gas generator 200; the length of the housing 100 is 187mm, the diameter of the inner shell 110 is 79mm, and the diameter of the outer shell 130 is 85 mm.

In the embodiment of the present application, the sealing plate 400 can seal the inner casing 110 and the outer casing 130 at the same end to prevent the insulation layer 120 filled between the inner casing 110 and the outer casing 130 from falling off. Since the housing 100 of the present embodiment is a circular tube, the sealing plate 400 of the present embodiment has an annular structure, and the outer diameter is equal to the diameter of the outer shell 130 and the inner diameter is equal to the diameter of the inner shell 110; accordingly, if the shape and size of the case 100 are changed, the size and shape of the sealing plate 400 are correspondingly changed.

In addition, the sealing plate 400 may be welded to the inner and outer cases 110 and 130, may be integrally formed with the inner and outer cases 110 and 130, and may be detachably coupled between the inner and outer cases 110 and 130. Illustratively, in this embodiment, the sealing plate 400 is detachably connected between the inner shell 110 and the outer shell 130, and the detachable connection is provided to facilitate replacement of the insulation layer 120.

In the embodiment of the present application, the gap between the housing 100 and the gas generator 200 ensures that the heat generated by the gas generator 200 is hardly conducted to the housing 100, and even if a large amount of heat is generated during the operation of the gas generator 200, the surface temperature of the housing 100 is hardly increased; meanwhile, the air flow in the gap can take away the heat generated by the gas generator 200, which is more beneficial to the heat dissipation of the housing 100. The distance between the housing 100 and the gas generator 200 in the embodiment of the present application should be 3-8 mm. Too large a distance causes inconvenience in carrying the heat-insulating gas generator, and too small a distance causes easy transfer of heat of the gas generator 200 to the housing 100, and also does not facilitate heat dissipation of the gas generator 200. Illustratively, in this embodiment, the distance between the housing 100 and the gas generator 200 is 5.5 mm.

In the embodiment of the present application, the "supporting frame 300 is used to fix the gas generator 200" may be implemented by respectively penetrating the fixing shafts 210 through the supporting frames 300 at the same end and fixing the fixing shafts with the supporting frames 300, such as: the support frame is a rigid structure and can be respectively connected with the gas generator 200 and the inner shell 110 in a threaded connection mode, so that the gas generator 200 is fixed relative to the shell 100, the gas generator is prevented from shaking and falling off, and the safety of the heat-insulating gas generating device is improved. Wherein "fixed together" may be either a fixed connection or a detachable connection. Because a large amount of gas can be generated rapidly in the gas generator 200, the support frame 300 is directly connected to the gas generator 200 and is easily damaged, the fixing shafts 210 are respectively connected to the two ends of the gas generator 200, and the support frame 300 is not easily damaged when being connected with the fixing shafts 210. The connection in the embodiment of the present application may be a fixed connection such as a threaded connection or welding, or a detachable connection, where the fixed connection can enhance the stability between the housing 100 and the gas generator 200, and the detachable connection facilitates the replacement of the gas generator 200 at any time, which is beneficial to the reuse of the housing 100. The connection of the present embodiment is, illustratively, a threaded connection.

In addition, support frame 300 in this application embodiment can be the cross structure or have the backup pad of fretwork etc. this kind of structure can fix gas generator 200 on the one hand, and on the other hand can not influence the ventilation cooling effect in clearance yet. As an example, the support frame 300 in the present application is a cross-shaped support frame, which is simple to manufacture and can save materials.

In the embodiment of the present application, the thermal insulation layer 120 has low thermal conductivity (thermal conductivity refers to the amount of heat transferred through a unit horizontal cross-sectional area per unit time when the temperature gradient is 1 ℃/m downward; the greater the thermal conductivity, the better the heat transfer performance of an object), and the thermal insulation layer 120 is filled between the inner shell 110 and the outer shell 130, so that even if the heat generated during the operation of the gas generator 200 is transferred to the inner shell 110, the thermal insulation layer 120 can absorb a large amount of heat to prevent the surface temperature of the housing 100 from increasing, thereby preventing the occurrence of the situation of burning the human body.

The material of the insulating layer 120 in this embodiment is an endothermic phase change material. In other implementations, other materials or media with heat absorbing function, such as a circulating heat absorbing medium, may also be used.

Phase change materials have the ability to change their physical state over a range of temperatures. Taking the solid-liquid phase change example, when the material is heated to the melting temperature, the phase change material generates the phase change from the solid state to the liquid state, and the phase change material absorbs and stores a large amount of heat in the melting process; when the phase change material is cooled, the stored heat is dissipated to the environment within a certain temperature range, and reverse phase change from liquid to solid is carried out. When the physical state changes, the temperature of the phase change material is almost kept unchanged before the phase change is finished, and a wide temperature platform is formed; although the temperature of the phase change material does not change, the amount of heat it absorbs or releases is considerable. The phase-change material can be one or more of paraffin, sodium acetate trihydrate, sodium thiosulfate pentahydrate, sodium hydrogen phosphate decahydrate and the like.

The heat insulation medium has low heat conductivity and large obstruction to heat transfer, and can effectively prevent the temperature of the surface of the shell 100 from rising; the heat insulation medium can be one or more of expanded vermiculite, vitrified micro bubbles, expanded perlite and the like.

In this embodiment, the heat insulating medium in the heat insulating layer 120 is a mixture of 40% expanded perlite and 60% vitrified micro bubbles, and the phase change material is a mixture of 35% sodium thiosulfate pentahydrate and 65% sodium acetate trihydrate.

In addition, in the embodiment of the present application, the material of the housing 100 may be metal (such as stainless steel or aluminum alloy), and exemplarily, the material of the support frame 300 may be metal or plastic, and the material of the sealing plate 400 may be metal or plastic. The metal material is not easy to deform, so that the structure of the heat-insulating gas generating device is firmer and is not easy to damage; the plastic material is beneficial to reducing the weight of the heat insulation gas generating device, so that the heat insulation gas generating device is easier to carry. In this embodiment, the housing 100, the supporting frame 300, and the sealing plate 400 are all made of stainless steel.

Second embodiment

Referring to fig. 1 and 4, the present embodiment provides an insulating gas generator, which has substantially the same structure as the insulating gas generator of the first embodiment, except that:

the supporting frame 300 in this embodiment is a hollow supporting plate structure, and has a circular ring shape and is provided with a hollow hole 310.

The support frame 300 in this embodiment has the hollow holes 310, which does not obstruct the air circulation in the gap, and is beneficial to the heat dissipation of the gas generator 200.

Third embodiment

Referring to fig. 5 to 6, the present embodiment provides an insulating gas generator, which has substantially the same structure as the insulating gas generator of the first embodiment, except that:

in this embodiment, the supporting frame 300 and the sealing plate 400 are not provided, two end faces of the inner shell 110 of the housing 100 in this embodiment are all closed, the gas generator 200 is provided in the housing 100, and the fixed shaft 210 is respectively in threaded connection with two end faces of the inner shell 110; the gas-permeable passages 140 are provided at both end surfaces of the inner case 110 corresponding to the gas generator 200, and the entire gas generator 200 is disposed inside the case 100.

The shell 100 with the columnar structure also comprises an inner shell 110 and an outer shell 130, and the heat insulation layer 120 can be fully filled between the inner shell 110 and the outer shell 130 or only filled on the side surface of the shell 100 with the columnar structure; the heat insulating layer 120 in this embodiment is filled only in the side surface of the case 100 of the columnar structure, which is advantageous in reducing the weight of the heat insulating gas generating apparatus.

The structure of the supporting frame 300 and the sealing plate 400 are omitted in this embodiment, the weight of the heat-insulating gas generator can be reduced, the heat-insulating gas generator is easier to carry, meanwhile, the fixing shaft 210 of the gas generator 200 in this embodiment is in threaded connection with the end face of the housing 100, the gas generator 200 can also be fixed, meanwhile, the gas-permeable passage 140 is arranged at the position, corresponding to the gas generator 200, of the end face of the housing 100, the flow of air in the gap is not obstructed, and the heat dissipation of the gas generator 200 is facilitated.

The gas generator 200 in the first embodiment is ignited, the surface temperature of the gas generator 200 and the surface temperature of the case 100 are measured in real time during the operation thereof, and it is determined that the surface temperature of the gas generator 200 is 278 ℃ at the maximum and the surface temperature of the case 100 is 47 ℃ at the maximum. The heat-insulating gas generator according to the present embodiment can effectively prevent the occurrence of scald in the human body during use. Meanwhile, the size of the heat-insulating gas generating device is convenient to carry.

The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (10)

1. The heat-insulating gas generating device is characterized by comprising a gas generator and a shell covered outside the gas generator, wherein the shell comprises an inner shell and an outer shell which are sleeved together, a heat-absorbing phase-change material is filled between the inner shell and the outer shell, and a gap is formed between the gas generator and the inner shell of the shell.

2. The thermally insulated gas generator according to claim 1, wherein the housing is tubular, the inner and outer shells of the housing are both tubular structures having openings at opposite end surfaces, and the gas generator is embedded inside the inner shell.

3. The thermally insulated gas generator according to claim 2, wherein the open end of the inner case is provided with a support bracket for fixing the gas generator.

4. The thermally insulated gas generator of claim 3, wherein the support frame is a cross-shaped structure, the end of the support frame abuts against the inner shell, and the gas generator is fixed at the intersection of the support frames.

5. The heat-insulating gas generator according to claim 3, wherein the support frame is a support plate having a hollow portion, an edge of the support frame abuts against the inner casing, and the gas generator is fixed to a middle portion of the support frame.

6. The thermally insulated gas generator according to claim 3, wherein the gas generator is provided with fixing shafts at opposite ends thereof, and the fixing shafts respectively penetrate through the supporting frames at the same ends and are fixed with the supporting frames.

7. The thermally insulated gas generator according to claim 2, wherein the same end edges of the inner and outer shells of the housing are connected together by a sealing plate and enclose a space between the inner and outer shells.

8. The thermally insulated gas generator according to claim 2 or 7, wherein both end surfaces of the inner shell of the housing are closed, and the gas generator is provided inside the inner shell and mounted on both end surfaces of the inner shell.

9. The thermally insulated gas generator according to claim 1, wherein both end surfaces of the housing are respectively provided with gas permeable passages.

10. The thermally insulated gas generator according to claim 1, wherein the housing is made of metal.

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