JPH0952568A - Gas instantaneous generator for expansion - Google Patents

Abstract

PROBLEM TO BE SOLVED: To instantaneously inflate a vehicular airbag, a lifeboat or the like with a simple structure by installing a pressure vessel with a pressure fluid sealed inside, an outlet sheet metal for forming a part of a wall to separate a pressure chamber, and a braking means for breaking the outlet sheet metal, upon receipt of an impact signal. SOLUTION: A cylindrical pressure vessel 4 with a pressure chamber 7 formed inside is provided, and pressure gas is sealed in the pressure chamber 7 from a pressure gas sealing port formed on the rear end of the pressure vessel 4. After sealing the pressure gas, the sealing port is closed with laser welding. Furthermore, an outlet 9 formed on the front end 5 of the pressure vessel 2 is sealed with an outlet sheet metal 8, and the center part of a reinforcement ring 14 fitted to the external surface of the sheet metal 8 has a trace of an explosive 18 and an ignition device as breaking means mounted between a cap and the sheet metal 8. When an ignition signal on the basis of an impact signal is sent, a trace of the explosive 18 is exploded to break the sheet metal 8, thereby blowing the pressure gas instantaneously.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an instant inflation gas generator suitable for instantly inflating an automobile air bag or life boat.

[0002]

2. Description of the Related Art A general air bag used in, for example, an automobile is inflated by a combustion gas which is rapidly expanded by combustion of explosive. In addition, Japanese Patent Publication No.
As shown in the publication, as a device other than the device of the expansion system using combustion gas, a device has been proposed in which high-pressure gas is enclosed in a pressure container and an inflating airbag or the like is inflated using this gas. Compared with the combustion gas type device, this pressure gas charging type device does not require measures for treating the combustion gas, heat measures for combustion, measures for manufacturing explosives, etc., and is expected to reduce manufacturing costs.

[0003]

However, in the conventional pressure-gas-filled system, a suitable mechanism for instantaneously sending the gas filled in the pressure container to the airbag has not been developed. . For example, in the case of an air bag for an automobile, from the detection of an automobile collision, for example, about 0.0
The airbag must be inflated within 3 seconds,
It has been difficult for the conventional pressure-gas-filled type device to satisfy this specification.

Further, in the pressure gas sealing type device, when gas leaks from the pressure container, the air bag may not be inflated when necessary. Therefore, in the past, as the airbag, a device of a combustion gas system using explosives is still used.

In addition to the airbag, it is also considered to use a pressure gas filling system as a device for instantly inflating a life boat used as a life saving tool for a ship. In such a case, in order to ensure reliability against pressure leakage, maintenance of the pressure vessel is required every few years, which increases the cost.

The present invention has been made in view of the above circumstances, and provides, for example, a pressure gas filling type instantaneous gas generator for inflation, which is suitable and practical for instantly inflating an automobile airbag or a life boat. The purpose is to do.

[0007]

In order to achieve the above object, the instant expansion gas generating device according to the present invention comprises a pressure vessel having a pressure chamber in which a pressure fluid is sealed,
An outlet thin plate that is attached to the pressure vessel and is a part of a wall that defines the pressure chamber, a destruction unit that is attached near the outlet thin plate and destroys the outlet thin plate by an impact signal, and the pressure chamber And a pressure sensor that detects the pressure.

The pressure sensor may be formed integrally with the surface of the outlet thin plate. In addition, the instant expansion gas generating device according to the present invention may further include a safety valve thin plate that is attached to the pressure vessel and is a part of a wall that defines the pressure chamber.

The expansion gas instantaneous generator according to the present invention further comprises a safety valve thin plate which is attached to the pressure vessel and which is a part of a wall defining the pressure chamber. The pressure sensor may be integrally formed. Further, a sensor holder having a pressure sensor may be fixed to the outlet thin plate.

According to another aspect of the present invention, there is provided an instantaneous expansion gas generator, which is provided with a pressure vessel having a pressure chamber in which a pressure fluid is sealed and which is attached to the pressure vessel.
An outlet plate that forms a part of the wall that defines the pressure chamber and has a thin portion in a part thereof, and a destruction means that is attached near the outlet plate and destroys the outlet thin plate by an impact signal,
A pressure sensor integrally provided near the thin portion of the outlet plate so as to detect the pressure in the pressure chamber.

In these expansion gas instantaneous generators, the memory means for reading the pressure data from the pressure sensor and storing the pressure data at every predetermined minute time, and the pressure data stored in the memory means are Judgment means for judging whether or not the pressure is equal to or higher than a predetermined reference pressure, alarm means for generating an output signal such as a warning when the pressure judged by the judgment means is equal to or lower than the reference pressure, and shock is sensed. It further comprises impact sensing means and impact-time memory control means for storing, when the impact is sensed by the impact sensing means, pressure data for a predetermined time after the impact in the memory means at every predetermined minute time. Is preferred.

The instant expansion gas generator according to the present invention is equipped with a pressure sensor for monitoring the pressure in the pressure vessel. Can be warned. As a result, it is possible to avoid a situation where the airbag, the life boat, or the like does not inflate when necessary.

Further, by utilizing the output signal from the pressure sensor, the pressure change in the pressure vessel at the time of collision can be stored in a nonvolatile manner. By analyzing the data of the pressure change after the collision, it is possible to confirm whether or not the airbag or the like is normally operated.

When the pressure vessel (burst pressure) cannot be made too high, it is preferable to further provide a safety valve thin plate that is thinner than the outlet thin plate. The safety valve thin plate is a portion for releasing the pressure before the pressure vessel is broken when the internal pressure becomes high for some reason.

In the present invention, as the destruction means,
It is preferable to use a small amount of explosive and ignition means. This minute amount of explosive may be such an amount as to instantly destroy the outlet thin plate or the outlet plate having a thin portion, and it is not necessary to generate combustion gas for expansion. Due to this minute explosion of the explosive, the outlet thin plate or the outlet plate is instantly destroyed, and the pressure gas in the pressure vessel is instantaneously sent to the inflation target such as an airbag or a life boat.

When the life boat is used for inflating, a high response speed is not required as compared with the case of inflating the airbag. Therefore, the destruction means is mechanically a thin plate for an outlet or an outlet. Means such as punching out a plate may be used.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an instant expansion gas generating apparatus according to the present invention will be described in detail with reference to the embodiments shown in the drawings. First Embodiment As shown in FIG. 1, an instantaneous expansion gas generator 2 according to the present embodiment has a pressure vessel 4 in which a pressure chamber 7 in which a pressure fluid is sealed is formed. As the gas sealed in the pressure vessel 4, for example, air or non-combustible gas can be preferably used. The gas pressure in the pressure vessel 4 is determined by the application in which the device 2 is used. For example, when the gas pressure is used as a device for inflating an airbag of an automobile or a life boat of a ship, it is 20
About 0 to 300 kgf / cm ² is preferable.

The pressure vessel 4 is made of, for example, carbon steel (S10
C, etc.), stainless steel (SUS430, etc.), etc. This pressure vessel has a cylindrical shape, and a pressure gas charging port 6 is formed at a rear end portion 3 thereof as shown in FIG. 2 (A). As shown in FIG. 2 (B), laser welding is performed by the method shown in DE 4208841C1 to obtain a welded portion 1.
5 closes the sealing port 6.

As shown in FIG. 1, the front end portion 5 of the pressure vessel 2 is
The exit thin plate 8 is attached to the. Details of this portion are shown in FIG. As shown in FIG. 3, the front end portion 5 of the pressure vessel 2 is
An outlet 9 is formed in the. And this exit 9
It is sealed by a thin plate 8 for the outlet. On the outer periphery of the thin plate 8,
Reinforcement ring 14 is attached, from above the reinforcement ring,
The welded portion 22 is formed by laser welding,
The reinforcing ring 14 and the thin plate 8 are fixed to the front end portion of the container 2. As a result, the thin plate 8 constitutes a part of the wall of the pressure chamber 7, and seals the pressure gas inside the pressure chamber 7.

At the center of the reinforcing ring 14, the cap 1
6 is attached by means such as screwing or caulking.
Between the cap 16 and the thin plate 8, a small amount of explosive 18 as a destruction means and an ignition device are mounted. In the present embodiment, these are mounted inside the cap 16. An input line 20 is connected to the ignition device for the small amount of explosive 18. An ignition signal based on the impact signal is supplied through the input line 20, and the small amount of explosive 18 explodes to destroy the thin plate 8.

A pressure sensor (pressure detecting means) 10 having a circuit structure as shown in FIG. 4, for example, is integrally formed in the thin plate 8. The pressure sensor 10 is not particularly limited, but a strain gauge 11 is used, for example, and is connected in a Wheatstone bridge shape as shown in FIG. 4 so that the pressure acting on the thin plate 8 can be detected. The pressure sensor 10 is connected to an external circuit via the output line 12 shown in FIG. The output line 12 may be housed in the same cable as the input line 20. The cable outlet is, for example, a connecting portion between the cap 16 and the reinforcing ring 14.

The thin plate 8 is not particularly limited, but is made of, for example, stainless steel (SUS301, SUS304, etc.). The thickness of the thin plate 8 is determined so that it can withstand the pressure in the pressure chamber 7 and is destroyed by the explosive force of the trace amount explosive 18, and is not particularly limited, but in the present embodiment, it is around 0.6 mm. Is. From the viewpoint of integrally forming the pressure sensor 10 on the thin plate 8, it is not preferable to make the thin plate 8 too thin.

Further, the thin plate 8 needs to operate as a safety valve in order to release the pressure before the pressure vessel 4 is broken when the internal pressure becomes high for some reason. That is, when the thin plate 8 operates as a safety valve and the pressure vessel 4 (burst pressure) cannot be made too high, the internal pressure of the pressure vessel 4 can be prevented from becoming too high.

In this embodiment, the inner diameter D of the outlet 9 is 1
When the thickness is 1 mm, the relationship between the wall thickness t of the thin plate 8 and the burst pressure (thickness at which the thin plate 8 is broken) is shown by an A type curve in FIG. It can be seen that the burst pressure increases as the wall thickness t increases. Further, the relationship between the burst pressure and the numerical value a / t in which the wall thickness t of the thin plate 8 is made dimensionless by the inner diameter (D = 2a) of the outlet 9 is shown by an A type curve in FIG. It can be seen that the burst pressure decreases as the inner diameter 2a increases or the wall thickness t decreases. Based on such a relationship, the amount of the small amount explosive 18 shown in FIG. 3 may be adjusted.

In the expansion gas instantaneous generator 2 according to this embodiment, the pressure sensor 10 for monitoring the pressure in the pressure vessel 2 is used.
Since it is attached, when there is a time-dependent change such as a gas leak from the pressure vessel 2, it can be warned. As a result, it is possible to avoid a situation where the airbag, the life boat, or the like does not inflate when necessary.

Further, in the present embodiment, when an ignition signal is sent from the input line 20, the explosive 18 is slightly exploded. As a result, the outlet thin plate 8 is instantly broken, and the pressure vessel 2
The pressurized gas therein is instantaneously sent to an inflation target such as an airbag or a life boat. Therefore, the airbag or the life boat can be inflated instantly (for example, within 0.025 seconds).

Second Embodiment As shown in FIG. 5, in the instantaneous expansion gas generator 2a according to this embodiment, the outlet 9a of the front end 5a of the pressure vessel 4a is provided.
Through holes 13 are formed so as to communicate with each other in a direction substantially orthogonal to. The thin plate 8a with the pressure sensor 10 similar to that used in the first embodiment is fixed to one open end of the through hole 13 in the same manner as described above. Similar to the first embodiment, a small amount of explosive 18a and an ignition device are mounted between the thin plate 8a and the cap 16a. An input line 20a is connected to the minute amount of explosive 18a, and an output line 12a is connected to the pressure sensor 10.

A safety valve thin plate 24 is attached to the other open end of the through hole 13. The outer periphery of the safety valve thin plate 24 is welded by laser welding to the pressure vessel 4a.
It is fixed to. The safety valve thin plate 24 also constitutes a part of the wall of the pressure chamber 7, similarly to the outlet thin plate 8a.

The safety valve thin plate 24, when the internal pressure becomes high for some reason, before the pressure vessel 4a is destroyed,
It is a part for releasing pressure. If the pressure vessel 4a cannot withstand a high pressure (burst pressure), for example, 60
The thin plate 24 that breaks at a pressure of about 0 kgf / cm ² is provided separately from the outlet thin plate 8a. When a pressure sensor is attached to the outlet thin plate 8a, its thickness is about 0.6 mm, and it is not destroyed by a pressure of about 600 kgf / cm ² . Therefore, when such an internal pressure is reached, it is possible to prevent the internal pressure of the pressure vessel 4a from becoming too high by breaking the safety valve thin plate 24 having a thickness of, for example, about 0.3 mm. Such a situation can be detected by the pressure sensor 10 attached to the thin plate 8a.

Other configurations and operations are similar to those of the first embodiment. Third Embodiment The instantaneous gas generator for expansion according to the present embodiment is a modification of the second embodiment shown in FIG. 5, and the pressure sensor 10 is not provided on the outlet thin plate 8a, but the pressure sensor 10 is provided as a safety valve. It is provided on the thin plate 24. Other configurations are the same as those of the second embodiment and have the same operation.

Fourth Embodiment The instant expansion gas generating apparatus according to the present embodiment is a modification of the second embodiment shown in FIG. 5, and the pressure sensor 10 is not provided on the outlet thin plate 8a, but the pressure sensor is provided. 10 is provided on the thin plate 24 side. Then, the thickness of the thin plate 24 is set to 0.6.
The thickness of the exit thin plate 8a is thinned to about 0.3 mm. In this embodiment, the thin plate 24
Does not function as a safety valve, but merely functions as a plate that holds the pressure sensor 10. Then, the outlet thin plate 8a also has a function as a safety valve. That is, in the present embodiment, the outlet thin plate 8a functions as a safety valve and also as a pressure gas release valve for inflating an airbag or the like. Other configurations are the same as those of the second embodiment and have the same operation.

Fifth Embodiment As shown in FIG. 6, in the instantaneous expansion gas generator 2b according to the present embodiment, the outlet 9b of the front end portion 5b of the pressure vessel 4b is provided.
A sensor holder 30 to which the pressure sensor 10 is attached
Is fixed to a central portion of the outlet thin plate 8b. The fixing method of the outlet thin plate 8b is the same as that in the first embodiment. That is, the reinforcing ring 14b is attached to the outer periphery of the thin plate 8b, and the welded portion 22b is formed by laser welding from above the reinforcing ring,
The reinforcing ring 14b and the thin plate 8b are fixed to the front end of the container 2b. As a result, the thin plate 8b constitutes a part of the wall of the pressure chamber 7, and seals the pressure gas in the pressure chamber 7.

A cap 16b is attached to the center of the reinforcing ring 14b by means such as screwing or caulking. Between the cap 16b and the thin plate 8b, a small amount of explosive 18b as a destruction means and an ignition device are mounted. In the present embodiment, these are mounted inside the cap 16b. The input line 20b is connected to the ignition device for the small amount of explosive 18b. An ignition signal based on the shock signal is supplied through the input line 20b, the small amount of explosive 18b explodes, and the thin plate 8
It is designed to destroy b.

The pressure sensor 10 attached to the sensor holder 30 is connected to an external circuit via the output line 12b. The output line 12b may be housed in the same cable as the input line 20b. The cable outlet is, for example, a connecting portion between the cap 16b and the reinforcing ring 14b. As the sensor holding body 30, for example, a commercially available one can be used, and this may be welded to the thin plate 8b by means such as laser welding. Therefore, it is not necessary to integrally form the pressure sensor 10 on the thin plate 8b, and the manufacturing is easy.

In this embodiment, when the inner diameter D of the outlet 9b is 11 mm, the relationship between the wall thickness t of the thin plate 8b and the burst pressure (thickness at which the thin plate 8b is broken) is shown by B type in FIG. Shown in the curve. It can be seen that the burst pressure increases as the wall thickness t increases. A numerical value a obtained by making the wall thickness t of the thin plate 8b dimensionless by the inner diameter (D = 2a) of the outlet 9b.
The relationship between / t and the burst pressure is shown by the B type curve in FIG. It can be seen that the burst pressure decreases as the inner diameter 2a increases or the wall thickness t decreases.
Further, it can be seen that the burst pressure is reduced when the inner diameter D and the thickness t are the same as in the first embodiment. Therefore, in this embodiment, the thin plate 8b can be easily used as a safety valve.

Other configurations and operations are the same as in the case of the first embodiment. Sixth Embodiment As shown in FIG. 9, in the inflation gas instantaneous generator 2c according to the present embodiment, an outlet plate 8c having a thin portion 32 is fixed to a front end portion 5c of a pressure vessel 4c. . The method for fixing the outlet plate 8c is the same as that in the first embodiment. That is, the welded portion 22c is formed on the outer periphery of the plate 8c, and the plate 8c is fixed to the front end of the container 2c. As a result, the plate 8c constitutes a part of the wall of the pressure chamber 7, and seals the pressure gas inside the pressure chamber 7.

A cap 16c is attached to the outside of the plate 8c by means such as screwing or caulking. Between the cap 16c and the plate 8c, a small amount of explosive 18c as a destruction means and an ignition device are mounted. In the present embodiment, these are mounted inside the cap 16c. An input line 20c is connected to the ignition device for the small amount of explosive 18c. An ignition signal based on the impact signal is supplied through the input line 20c, and the small amount of explosive 18c explodes to destroy at least the thin portion 32 of the plate 8c.

The pressure sensor 10c mounted near the thin portion 32 is connected to an external circuit via the output line 12c. The output line 12c may be housed in the same cable as the input line 20c. The cable outlet is, for example, a connecting portion between the cap 16c and the pressure vessel 4c.

Other configurations and operations are the same as in the case of the first embodiment. Seventh Embodiment In the instant expansion gas generator according to the present embodiment, the control circuit shown in FIG. 10 is connected to the pressure sensor 10 of the instant expansion gas generator according to any one of the above embodiments.

As shown in FIG. 10, an A / D converter 40 is connected to the pressure sensor 10. A / D converter 4
Reference numeral 0 is an input / output circuit for converting an analog output from the pressure sensor 10 into a digital signal. A memory means 42 is connected to the A / D converter. This memory means 4
As shown in FIG. 10, a normal pressure monitoring means 44 is connected to 2 to monitor the pressure signal stored in the memory means 42.

The memory means 42 is preferably composed of, for example, a rewritable nonvolatile memory. Address storage means 46 and address generation means 48 are connected to the memory means 42. The clock signal from the clock circuit 54 is input to the address generating means 48 and the A / D converter 40. The address generating means 48 generates an address signal based on the clock signal from the clock circuit 54, for example, at 1 msec intervals,
These signals are stored in the memory means 42 and the address storage means 4
Send to 6.

A / D converter 40 and address generating means 48
In the case where pressure data before and after the collision is stored in the address storage means 46 and the pressure data before and after the collision, for example, if the time is 5 seconds before and after the collision and 0.1 seconds after the collision, the 0.1 sec timer 52.
The output signal from is input. 0.1se
c The timer 52 measures 0.1 second on the basis of the output from the impact sensor 50 and outputs the signal to the A / D converter 4
0, address generation means 48 and address storage means 46
To be sent to

The impact sensor 50 is a sensor for detecting an impact on the vehicle body or the like.
The detection signal is transmitted to the 0.1 sec timer 52 and the address storage means 46. Next, the operation of the circuit shown in FIG. 10 will be described mainly based on FIG.

As shown in FIG. 13, when the control is started, in step S1, the pressure sensor 10 is operated for 1 msec.
The pressure data is read every time, and in step S2, the pressure data Pn is stored in the memory means 42 shown in FIG. The memory means 42 stores the pressure data for each address generated by the address generation means 48, as shown in FIG. The pressure data is, for example, the internal pressure of the pressure container 4 shown in FIG.

Next, in step S3 shown in FIG. 13, the sequentially read pressure data Pn is the predetermined reference pressure P.
It is determined whether or not it is larger than a. The judgment is shown in FIG.
The normal pressure monitoring means 44 shown in FIG. The pressure of the gas initially enclosed in the pressure vessel 4 shown in FIG.
If f / cm ² , the reference pressure Pa is about 80%, that is, about 200 kgf / cm ² .

If it is determined in step S3 shown in FIG. 13 that the pressure data Pn is smaller than the reference pressure Pa, an alarm is output in step S4. If not, the process goes to step S5 to determine whether or not an impact signal is received from the impact sensor 50 shown in FIG. If no impact is sensed, steps S1 to S5 are repeated.

If an impact is sensed in step S5, the flow advances to step S6 to activate the 0.1 sec timer 52 shown in FIG. Next, it progresses to step S7 and 1ms
The pressure data is stored in the memory means 42 shown in FIG. 10 for each ec. As shown in FIG. 13, in step S8 after step S7, 0.1 second after impact is measured by the timer 52 shown in FIG. 10, and at that time, the A / D converter 40, the address generation means 48, and The address storage means 46 is stopped to terminate the control.

FIG. 12 shows data stored in the memory means 42 when an impact signal is received at the address 200. In the example shown in FIG. 12, the memory means 4 shown in FIG.
In No. 2, the pressure data for 5 seconds at maximum can be stored, and the pressure data 5 seconds before is written in the address next to the latest data. In addition, if 5 seconds before and after the impact (0.1 seconds after the impact), the address interval is 1 msec, and one pressure data is 1 byte (8 bits), a memory capacity of 5000 bytes is required for 5 seconds.

The pressure data for 5 seconds before and after this impact is
When read from the memory means 42 and made into a graph, FIG.
The graph shown in is obtained. In FIG. 11, a curved line a is a curved line when the airbag operates normally, a curved line b is a curved line when a hole is formed in the airbag or a path leading to the airbag, and a curved line c is a curved line. It is a curve when resistance is excessively added and it is difficult to open. That is, according to this embodiment, it is possible to confirm whether or not the airbag or the like has normally operated after the impact.

The present invention is not limited to the above-mentioned embodiments, but can be variously modified within the scope of the present invention. For example, the memory means 42 shown in FIG.
Other non-volatile memory or other memory means,
The pressure data before and after the impact may be stored. It is preferable that the memory means 42 or at least the memory means in which data after impact is stored is housed in an earthquake resistant box or the like that is protected from impact and the like so that data can be easily retrieved later. In addition, a memory protection case (box) for storing pressure data
Is preferably a black box of an airplane including not only quake resistance for protection against impacts but also waterproof, disaster prevention and weather resistance.

Furthermore, the alarm output by the normal pressure monitoring means 44 can be output by a visual method (optical) by color coding or the like, or an auditory method (accortic) by an alarm buzzer, etc. It is preferable that an alarm display in the central cab and a buzzer be connected wirelessly or by wire so that which part of which pressure vessel is abnormal can be comprehensively displayed as a system (can be centrally managed).

The alarm output by the normal pressure monitoring means 44 is 300 kgf / cm ² and 250 kgf / cm ^2.
Not only the measured value, but also 10% against the filling pressure, 20
It may be output when a reduced pressure of% occurs. However, in this case, the high-pressure enclosed pressure is accurately adjusted, and the pressure (reference pressure) Pa is set to 100 (%), and the pressure data P
When n is 90 (%) or 80 (%), the pressure is lower than the enclosed pressure, and an alarm is output as an abnormality.

[0053]

As described above, according to the present invention, for example, an instantaneous inflation gas generator for pressure gas injection is suitable and practical for inflating an automobile airbag or a life boat in an instant. Can be provided.

Particularly, in the present invention in which the pressure sensor is integrated on the surface of the outlet thin plate, the device structure becomes simple. Also,
In the present invention which further has a thin plate for a safety valve, it is possible to provide separate thin plates with a function as a safety valve of a pressure vessel and a function of ejecting a pressure fluid when it is destroyed, and the thickness of each thin plate is optimized. Can be achieved.

Further, the pressure sensor may be formed on the side of the safety valve thin plate. In this case, the pressure detection after impact is performed with high accuracy without the damage of the outlet thin plate affecting the pressure sensor. You can Furthermore, the existing pressure sensor assembly can be used by attaching the pressure sensor directly to the outlet thin plate through the sensor holding body without attaching the pressure sensor, which is economical.

Further, in the present invention in which the thin portion is provided on the outlet plate, the thin portion is destroyed, so that the thickness of the outlet plate can be freely set. Further, in the present invention having the alarm means and the memory control means at the time of impact, it is possible to easily know the pressure drop, and it is possible to know the failure location of the equipment or the like from the pressure state at the time of impact.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view of an expansion gas instantaneous generator according to an embodiment of the present invention.

2 (A) and 2 (B) are enlarged cross-sectional views of a main part of a portion II in FIG.

FIG. 3 is an enlarged cross-sectional view of a main part of section III in FIG.

FIG. 4 is a circuit diagram showing an example of a pressure sensor.

FIG. 5 is a schematic cross-sectional view of a main part of an instantaneous expansion gas generation device according to another embodiment of the present invention.

FIG. 6 is a schematic cross-sectional view of an essential part of an instantaneous expansion gas generation device according to still another embodiment of the present invention.

FIG. 7 is a graph showing the relationship between plate thickness and burst pressure in the embodiment shown in FIGS. 1 and 6.

FIG. 8 is a graph showing the relationship between the plate thickness dimensionlessized by the inner diameter of the outlet 9 and the burst pressure in the embodiment shown in FIGS. 1 and 6.

FIG. 9 is a schematic cross-sectional view of an essential part of an instantaneous expansion gas generation device according to still another embodiment of the present invention.

FIG. 10 is a block diagram of a circuit for processing an output signal from a pressure sensor.

FIG. 11 is a graph showing changes in pressure after impact.

FIG. 12 is a schematic diagram showing a relationship between addresses and data stored in a memory.

13 is a flowchart showing the operation of FIG.

[Explanation of symbols]

 2 ... Instantaneous gas generator for expansion 3 ... Rear end 4 ... Pressure vessel 5 ... Front end 6 ... Sealing port 7 ... Pressure chamber 8 ... Outlet thin plate 9 ... Outlet 10 ... Pressure sensor 11 ... Strain gauge 12 ... Output line 14 Reinforcement ring 16 Cap 18 Minor explosive 20 Input wire 22 Welded portion 24 Safety valve thin plate 26 Reinforcement ring 28 Welded portion 30 Sensor holder 32 Thin portion 40 A / D converter 42 Memory Means 44 ... Normal pressure monitoring means 46 ... Address storage means 48 ... Address generation means 50 ... Impact sensor 52 ... Timer 54 ... Clock

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroyuki Niemoto 4-3-1 Tsujido Shinmachi, Fujisawa City, Kanagawa NOK Co., Ltd. (72) Inventor, Walter Jung, Göppingen 73035 Hajdi Strasse 44

Claims (7)

[Claims] 1. An instantaneous gas generator for expansion (2) for instantaneously feeding gas into an object to be expanded, wherein a pressure chamber (7) in which a pressure fluid is sealed is formed inside. A pressure vessel (4) and the pressure chamber (7) attached to the pressure vessel (4)
An outlet thin plate (8) that is a part of a wall that divides the outlet, and a destruction means (18) attached near the outlet thin plate (8) and destroying the outlet thin plate (8) by an impact signal.
And a pressure sensor (1 for detecting the pressure in the pressure chamber (7)
0) and an instantaneous gas generator for expansion (2). 2. The instant expansion gas generator (2) according to claim 1, wherein the pressure sensor (10) is integrally formed on the surface of the outlet thin plate (8). 3. Instantaneous expansion gas generation according to claim 2, further comprising a safety valve thin plate (24) attached to the pressure vessel (4) and forming a part of a wall defining the pressure chamber (7). Device (2). 4. A safety valve thin plate (24) attached to the pressure vessel (4) and forming a part of a wall defining the pressure chamber (7), the safety valve thin plate (24) further comprising:
The instant expansion gas generator (2) according to claim 1, wherein the pressure sensor (10) is integrally formed. 5. The expansion gas instantaneous generator (2) according to claim 1, wherein a sensor holder (30) having a pressure sensor (10) is fixed to the outlet thin plate (8b). 6. An instantaneous gas generator for expansion (2c) for instantaneously feeding gas into an object to be expanded, wherein a pressure chamber (7) for enclosing a pressure fluid is formed inside. A pressure vessel (4c) and a part of a wall that is attached to the pressure vessel (4c) and defines the pressure chamber (7), and a thin portion (3)
An outlet plate (8c) having 2), and a destruction means (18c) attached near the outlet plate (8c) and destroying the outlet plate (8c) by an impact signal.
And a pressure sensor (10c) integrally provided near the thin portion (32) of the outlet plate (8c) so as to detect the pressure in the pressure chamber (7) Generator (2c). 7. A memory means (42) for reading pressure data from the pressure sensor (10) and storing the pressure data at every predetermined minute time, and pressure data stored in the memory means (42). , Determining means for determining whether or not the pressure is equal to or higher than a predetermined reference pressure (4
4), an alarm means for generating an output signal such as a warning when the pressure judged by the judging means (44) is lower than a reference pressure, a shock sensing means (50) for sensing a shock, and a shock sensing When a shock is detected by the means (50), a shock storage control means (52) for storing the pressure data for a predetermined time after the shock in the memory means (42) at every predetermined minute time. The expansion gas instantaneous generator (2) according to any one of claims 1 to 6 which has.