CN101029705B - Gas cartridge - Google Patents

Abstract

In the gas cartridge, a metal inner bag (2) filled with fuel gas (G1) is disposed inside the metal outer cylinder (1); the space between the outer cylinder (1) and the inner bag (2) is filled with The compressed gas (G2) of the above-mentioned inner bag (2) is crushed by the consumption of the above-mentioned fuel gas (G1); the deformation guide part (P1-P7) is integrally formed with the above-mentioned inner bag, and is used to follow the above-mentioned liquefied fuel gas (G1) ) consumption, when receiving the extrusion force of the above-mentioned compressed gas (G2), guide the deformation of the above-mentioned inner bag.

Description

Gas cartridge

technical field

The present invention relates to a gas cartridge for supplying fuel gas used in a driving tool such as a gas hammer for driving fasteners such as nails and screws with gas combustion pressure.

Background technique

In the striking tool for striking fasteners such as nails and screws by the combustion pressure of gas, a gas cartridge is installed, and the gas is supplied by the gas cartridge. In general, a gas cartridge has a multiple structure consisting of an outer container (outer cylinder), a gas-filled container (inner bag), and an inner space formed between the two containers. The gas-filled container is compressed and deformed by the pressure of the high-pressure compressed gas filled in the internal space, and the liquefied fuel gas in the gas-filled container is ejected.

In addition, the outer container and the gas-filled container of the gas cartridge having the above-mentioned double-chamber structure pressurized filling device are made of aluminum, especially the gas-filled container is easily deformed by the compression force of the compressed gas, and the internal gas does not permeate to the outside. Therefore, it is preferable to use a thinner aluminum container that is easily deformed (refer to Japanese Patent No. 2873691).

On the other hand, in the multi-structure container of the above-mentioned gas cartridge, the pressure of the compressed gas filled in the internal space between the two containers crushes the gas-filled container and makes it dented and deformed, so that the fuel gas in the gas-filled container is released into the storage tank. The outside of the gas cylinder. Since the deformation of the gas-filled container using the gas pressure is free deformation, the gas-filled container may not deform uniformly. That is, at the initial stage of deformation of the gas-filled container, a portion having low rigidity is dented and deformed, and as the deformation of this portion is further promoted, only one large dented deformation occurs in many cases.

In addition, since the opening and the bottom of the gas-filled container are relatively rigid and difficult to deform, stress is concentrated on parts other than these parts, and the deformation proceeds continuously from the initial deformation part that deforms first, so only a part is greatly deformed. Therefore, this part produces wrinkles, creases, and cracks and perforations. For example, as shown in FIG. 15, the bottom 12 of the inner bag 2 is stretched toward the opening side, and the stress tends to concentrate on the boundary portion 13 between the bottom 12 and the side portion 10, so that the large deformation of the bottom 12 topples over to the opening side occurs. Phenomenon. Then, when a crack or a hole occurs in the gas-filled container, compressed gas enters the inner bag filled with gas, so that the pressure of the compressed gas is relatively lowered, and the gas-filled container cannot be fully compressed. Therefore, the release of the fuel gas becomes insufficient, and when the fuel gas remains, the function as the gas cartridge is lost. Discarding the fuel gas before it is fully utilized not only leads to a decrease in the working efficiency of the striking tool using the gas as a driving source, but also causes an economic loss.

In short, since both the outer cylinder and the inner bag are made of metal in the gas cartridge, and especially the inner bag is thin, there is a unique problem that cracks and perforations are likely to occur.

Contents of the invention

More than one embodiment of the present invention provides an air storage tank: from the perspective of improving the inner bag, by improving the air storage tank, it is possible to prevent the stress from concentrating only on a part of the inner bag under the action of compressed gas, so that the inner bag is not deformed in a concave manner. One place, which can effectively prevent the inner bag from cracking and perforation.

According to the first aspect of the present invention, there is provided a gas storage cartridge in which a metal inner bag filled with gas is arranged inside a metal outer cylinder, and a space between the outer cylinder and the inner bag is filled with a gas cartridge to accompany the gas flow. The compressed gas that is consumed and crushes the above-mentioned inner bag has a deformation guide part, and the deformation guide part is integrally formed with the above-mentioned inner bag. Deformation produced on the inner bag mentioned above.

Furthermore, according to a second aspect of the present invention, in the air cartridge of the first aspect, the deformation guide portion has a plurality of grooves formed along the longitudinal direction of the inner bag.

Furthermore, according to a third aspect of the present invention, in the air cartridge of the first aspect, the deformation guide portion has a plurality of thick portions formed in a band shape along the longitudinal direction of the inner bag.

Furthermore, according to a fourth aspect of the present invention, in the air cartridge of the first aspect, the deformation guide portion has a rib-shaped protrusion formed along the longitudinal direction of the inner bag.

In addition, according to a fifth aspect of the present invention, in the gas cartridge according to the first aspect, the deformation guide portion has a three-dimensional pattern having rhombic notch-shaped irregularities.

Furthermore, according to a sixth aspect of the present invention, in the gas cartridge according to the first aspect, the deformation guide portion has a three-dimensional pattern having bellows-shaped concavities and convexities.

According to the above-mentioned first viewpoint, since the deformation guide portion for generating initial deformation is formed integrally with the inner bag, the inner bag is crushed and deformed by the pressing force of the compressed gas as the gas in the inner bag is consumed. At this time, since the initial deformation that deforms first promotes subsequent deformation, the deformation gradually advances from the initial deformation portion. In this way, the deformation can be consciously guided, so that the deformation generated by the compressed gas can be distributed to multiple places without biasing towards the place where the stress is concentrated. And since the initial deformation depends on the deformation guide, the physically least rigid portion is less likely to undergo initial deformation. Therefore, generation of cracks and perforations caused by wrinkles and creases can be effectively prevented.

And, according to the second viewpoint, since the above-mentioned deformation guide part is a plurality of grooves formed along the longitudinal direction of the above-mentioned inner bag, the above-mentioned inner bag will be deformed when it is squeezed by the compressed gas as the fuel gas is consumed. The deformation of the groove gradually advances from the concave part. In this way, the deformation can be consciously guided, so the occurrence of cracks and perforations caused by wrinkles and creases can be effectively prevented.

Furthermore, according to the third viewpoint, since the deformation guide part is formed of a plurality of band-shaped thick parts, the deformation guide part is not easily deformed, and deformation can be consciously guided to the portion without the deformation guide part. Therefore, cracks and perforations caused by wrinkles and creases can be effectively prevented.

In addition, according to the fourth viewpoint, since the deformation guide is a rib-shaped protrusion formed along the longitudinal direction of the inner bag, the protrusion is not easily deformed, and deformation can be consciously guided to the portion without the deformation guide. Therefore, cracks and perforations caused by wrinkles and creases can be effectively prevented.

And, according to the fifth viewpoint, since the above-mentioned deformation guide part is a three-dimensional pattern with diamond-shaped notch-shaped concavities and convexities, the deformation of the inner bag due to the squeezed gas will not be concentrated in one place, and can be pushed in various directions. Therefore, cracks and perforations can be effectively prevented.

Furthermore, according to the sixth viewpoint, since the deformation guide portion is a three-dimensional pattern having bellows-like concavities and convexities, the deformation of the inner bag due to the compressed air is crushed in the longitudinal direction, and the deformation is regularly reduced. Therefore, occurrence of cracks and perforations can be effectively prevented.

Other characteristics and effects can be clarified through the embodiments and drawings.

Description of drawings

Fig. 1 is a perspective view of an air cartridge according to an exemplary embodiment of the present invention.

Fig. 2A is a longitudinal sectional view of the above gas cartridge.

Fig. 2B is a cross-sectional view on line a-a of Fig. 2A.

Fig. 3 is an exploded perspective view of the above gas cartridge.

Fig. 4A is a longitudinal sectional view of the above gas cartridge before gas filling.

Fig. 4B is a cross-sectional view on line b-b of Fig. 4A.

5A relates to a modified example of the typical embodiment of the present invention, and is a perspective view of a state in which a thick rib is provided on the outer surface of the inner bag as a deformation guide.

5B relates to a modified example of the typical embodiment of the present invention, and is a perspective view of a state in which thick ribs are provided as deformation guides on the inner surface of the inner bag.

5C relates to a modified example of the typical embodiment of the present invention, and is a perspective view of a state in which thick ribs are provided on the inner surface and the outer surface of the inner bag as deformation guides.

Fig. 6A is a longitudinal sectional view of another form of the air cartridge of the typical embodiment of the present invention.

Fig. 6B is a cross-sectional view on line c-c of Fig. 6A.

Fig. 7 is an exploded perspective view of the above gas cartridge.

Fig. 8A is a transverse cross-sectional view showing a deformed state of the inner bag by a rib-shaped deformation guide portion, showing a state in which liquefied fuel gas is not filled.

Fig. 8B is a transverse cross-sectional view showing the deformed state of the inner bag by the rib-shaped deformation guide portion, showing the state filled with liquefied fuel gas.

Fig. 8C is a transverse cross-sectional view showing the deformation state of the inner bag by the rib-shaped deformation guide part, showing the state after deformation.

Fig. 9 is a transverse cross-sectional view of another example of a rib-shaped deformation guide.

Fig. 10 is a perspective view of another form of the deformation guide of the inner bag.

Fig. 11 is a longitudinal sectional view of still another form of the deformation guide.

Fig. 12 is a longitudinal sectional view of a state in which thick ribs are provided as deformation guides at the bottom of the inner bag.

Fig. 13 is a transverse cross-sectional view in which the inner bag has an elliptical cross-sectional shape as a deformation guide.

Fig. 14A is a transverse cross-sectional view in which the shape of the bottom of the inner bag is spherical as a deformation guide.

Fig. 14B is a transverse cross-sectional view in which the shape of the bottom of the inner bag is spherical as a deformation guide.

Fig. 15 is a longitudinal sectional view showing an example of deformation of a conventional inner bag.

Detailed ways

Typical embodiments of the present invention and several modes thereof will be described below with reference to the drawings.

The gas filled in the inner bag is generally, but not limited to, liquefied gas.

In FIGS. 1 to 3 , symbol A denotes an air cartridge. The gas cartridge A is composed of an outer cylinder 1 ; an inner bag 2 arranged inside the outer cylinder 1 ; and a cap valve member 3 for injecting gas filled in the inner bag 2 , and the like.

As shown in FIG. 3, the outer cylinder 1 is composed of an aluminum cylindrical member having a predetermined thickness and a predetermined diameter and a predetermined length, and one end is open and the other end is closed. In contrast, the inner bag 2 is arranged inside the outer cylinder 1, so when the gas filled in it is in an unfilled state, it has a shape similar to that of the outer cylinder 1 and is smaller than the outer cylinder 1. Constructed of aluminum bottomed cylinder parts.

The inner bag 2 is inserted into the outer cylinder 1 . Furthermore, the opening edges of the outer cylinder 1 and the inner bag 2 are integrally joined to each other by performing wrapping and fixing processing on the peripheral portion 3 a of the cap valve member 3 . And, in the state where the gas is not filled, as shown in FIGS. 4A and 4B , a side space S2 is formed between the outer peripheral surface of the inner bag 2 and the inner peripheral surface of the outer cylinder 1 . Meanwhile, a bottom space S1 is continuously formed between the bottom of the outer cylinder 1 and the bottom of the inner bag 2 .

The inside of the inner bag 2 is filled with liquefied fuel gas G1 from the injection pipe 4 of the cover valve member 3 . At this time, the inner bag 2 is inflated as shown in FIGS. 2A and 2B . In addition, the inner spaces S1 and S2 of the outer cylinder 1 of the container are filled with compressed gas G2 for crushing the inner bag 2 for gas injection. The compressed gas G2 squeezes the surface of the inner bag 2 with a high pressure higher than the pressure of the liquefied fuel gas G1, and the inner bag 2 is crushed, so that the fuel gas G1 is sprayed from the injection pipe 4 of the cover valve part 3 to the outside. G2 usually uses propane, propylene, butane and other gases. An opening 8 for filling the compressed gas is formed at the bottom of the outer cylinder 1, and the compressed gas G2 is filled therethrough, and the opening 8 is closed with a plug 9 .

Thereby, as shown in FIG. 1, FIG. 2A and FIG. 2B, an air cartridge A with a dual structure consisting mainly of an outer cylinder 1 and an inner bag 2 and having a concentric arrangement of a cover valve member 3 is formed.

In the above-mentioned structure, when the above-mentioned air cartridge is used for striking tools, the injection tube 4 is pressed against the force of the spring 6 biasing the valve body 5, and the valve body 5 is opened, so that the gas inside the inner bag 2 is injected into the air. external. And, as the gas in the inner bag 2 is released, the compressed gas G2 in the outer tube 1 continues to squeeze the inner bag 2, so that the pressure in the inner bag 2 does not decrease, so that the fuel gas G1 continues to be injected.

Next, three (not limited to three) concave strips P1 are equally formed directly in the inner bag 2 as deformation guides. The grooved portion P1 may be formed in advance at the stage of manufacturing the inner bag 2 . In addition, the grooved part P1 may be an intermittent shape other than the long shape in the longitudinal direction.

Through the above-mentioned structure, when the inner bag 2 is crushed by the compressed gas G2, the three grooves P1 uniformly formed on the inner bag 2 are guided to deform first and gradually advance, so the deformation caused by extrusion is evenly distributed to three places. In this way, the deformation can be consciously guided, and the occurrence of cracks and perforations can be effectively prevented.

Next, in FIG. 5A , as a deformation guide portion, a belt-shaped thick portion P2 is formed along the longitudinal direction of the outer peripheral surface of the inner bag 2 . The thick wall portion P2, in addition to being formed to protrude toward the outer side of the inner bag 2, may also protrude toward the inner side of the inner bag 2 as shown in FIG. 5B, or toward the inner and outer sides of the inner bag 2 as shown in FIG. protrude.

According to the above structure, since the thick wall portion P2 of the inner bag 2 is thick, when the inner bag 2 is crushed by the compressed gas G2, the inner bag 2 is not easily deformed due to the thick wall portion P2, so the other parts are first dented and deformed. In this way, the deformation of several parts without deformation guides can be consciously guided, thereby avoiding localized stress concentration, and the deformation caused by the compressed gas G2 will not be biased to one place. Therefore, generation of cracks and perforations caused by wrinkles and creases can be effectively prevented.

6A to 7 show an embodiment in which the deformation guide portion is a plurality of rib-shaped protrusions P3 protrudingly formed on the outer peripheral surface of the inner bag 2 .

The state in which the inner bag is deformed by gas filling will be described with reference to FIGS. 8A to 8C . First, from the unfilled state shown in FIG. 8A , after filling the inner bag 2 with liquefied liquefied fuel gas G1 as shown in FIG. 8B , the inner bag 2 expands and deforms due to the pressure during filling, The protrusions P3 of the inner bag 2 are in contact with the inner surface of the outer cylinder 1, and are prevented from expanding due to the influence of the protrusions P3, thereby forming a recess 10 in the inner bag 2. Furthermore, the spaces S1 and S2 between the outer cylinder 1 and the inner bag 2 are filled with high-pressure compressed gas G2.

In the above-mentioned structure, when the above-mentioned gas cartridge is used for hitting tools, etc., as the liquefied fuel gas G1 in the inner bag 2 is consumed, the inner bag 2 is crushed and deformed by the compressed gas G2, but as shown in Fig. 8B and Fig. 8C As shown, the deformation starts naturally from the deformation concave portion 10 formed by the protrusion portion P3 and gradually advances. Also, the deformation of the portion without the deformation guide portion can be consciously guided. Therefore, the deformation caused by extrusion will not be biased to one place, but can be evenly distributed to three places, so local stress concentration is avoided, and cracks and perforations caused by wrinkles and creases can be effectively prevented.

In addition, the recesses 10 formed in the inner bag 2 are not formed in advance, but are initially deformed by the protrusions P3 when the liquefied fuel gas G1 is filled, and wrinkles are less likely to occur when deformed while filling the gas. Therefore, perforation is also less likely to occur.

And because of the average deformation, there is no need for additional frame-shaped parts or special processing steps, thereby reducing costs.

In addition, the protrusion part P3 is not limited to the outer peripheral surface of an inner bag. It may also be formed on the inner peripheral surface. In this case, as the gas in the inner bag is released, when the inner bag is crushed by the compressed gas G2 in the outer cylinder, the part where the protruding part P3 is provided is not easy to deform, so the part between the ribs is first When it starts to deform, the deformation caused by extrusion will not be biased to one place, but will be evenly distributed to three places.

As shown in FIG. 9, the protrusion part P3 can be formed in pairs at various places.

In addition, as a method of directly forming the deformation guide portion on the inner bag 2, the three-dimensional pattern P4 having the concavo-convex pattern P4 shown in FIG. 10 may be directly formed on the outer peripheral portion of the inner bag 2. The above-mentioned three-dimensional pattern P4 can be uniformly and uniformly formed on substantially the entire surface of the inner bag 2 except the vicinity of the opening of the outer peripheral portion.

With the above structure, the deformation caused by the extruded gas of the inner bag becomes a regular deformation formed along the unevenness of the three-dimensional pattern P4, and can be pushed in various directions without being concentrated in one place. Therefore, occurrence of cracks and perforations can be effectively prevented.

Further, as shown in FIG. 11 , the three-dimensional pattern P5 having bellows-like concavities and convexities may be formed directly on the outer peripheral portion of the inner bag 2 . The three-dimensional pattern P5 may be uniformly formed on substantially the entire surface of the outer peripheral portion of the inner bag 2 except a part near the opening and the bottom.

In this way, the inner bag 2 formed with the three-dimensional patterns P4 and P5 of diamond-shaped notch-shaped concavo-convex or bellows-shaped concavo-convex is deformed as the liquefied fuel gas G1 inside is consumed and crushed by the compressed gas G2, but the deformation The unevenness corresponding to the above-mentioned three-dimensional pattern P5 is squeezed in the longitudinal direction, and shrinks and deforms regularly. Therefore, uniform deformation is performed so as to shrink in the longitudinal direction as a whole. Thus, cracks and perforations can be effectively prevented.

Furthermore, according to these embodiments, there is no need to provide a special deformation guide between the outer cylinder and the inner bag, so the outer diameter does not become larger and the appearance is not impaired.

Further, as the deformation guide portion formed on the inner bag 2 itself, as shown in FIG. 12 , a thick portion P6 may be formed at the bottom of the inner bag 2 . In this case, the thick wall part P6 is difficult to deform, and the deformation of several parts without deformation guide parts can be consciously guided. Therefore, when the inner bag 2 is crushed by the compressed gas G2, the stress is not easy to concentrate locally, which can effectively prevent the inner bag from being deformed. The bag 2 is largely deformed in a part.

The thickness of the thick portion P6 at the bottom of the inner bag 2 is preferably at least twice the thickness of the side portion 11 .

In addition, as the deformation guide portion formed on the inner bag 2 itself, as shown in FIG. 13 , the lateral cross-sectional shape of the inner bag 2 may be an ellipse instead of a circle.

In this case, when the inner bag 2 is squeezed by the compressed gas G2, the inner bag 2 is crushed as shown by the arrow, and the stress is not concentrated in one part, so that the inner bag 2 can be effectively prevented from deforming only in one place.

Further, as the deformation guide portion formed on the inner bag 2 itself, as shown in FIG. 14A, the shape of the bottom P7 of the inner bag 2 may not be a circular plate but a hemispherical shape.

In this case, when the compressive force by the compressed gas G2 is applied, it is difficult to generate a stress-concentrated part compared with the conventional bottom and side parts bent at substantially right angles, so the entire part is crushed. Therefore, only a part of the inner bag 2 can be effectively prevented from being largely deformed.

Also, the shape of the bottom is not limited to a hemispherical shape. As shown in Fig. 14B, the front end of the bottom P7 may also be slightly pointed.

The present invention has been described in detail with reference to specific embodiments, and various modifications and corrections can be made by those skilled in the art without departing from the spirit and scope of the present invention.

This application claims the priority of the following applications, and refers to their contents: Japanese patent application filed on January 27, 2006 (Japanese patent application No. 2006-019119), Japanese patent application filed on February 27, 2006 (Japanese patent application No. 051086), Japanese patent application filed on March 30, 2006 (Japanese Patent Application No. 2006-095386), Japanese patent application filed on May 12, 2006 (Japanese Patent Application No. 2006-133662), and Japanese patent application filed on November 8, 2006 Japanese patent application (Japanese Patent Application No. 2006-303325).

The present invention is applicable to a gas cartridge for supplying fuel gas used in a driving tool such as a gas hammer that drives fasteners such as nails and screws with the combustion pressure of gas.

Claims (1)

1. A gas storage tank, having: Metal outer cylinder (1); A metal inner bag (2) is disposed inside the outer cylinder (1), and fuel gas (G1) is filled in the metal inner bag (2), and the space (S1, S2) between the outer cylinder and the inner bag is ), filled with compressed gas (G2) for crushing the above-mentioned inner bag (2) as the above-mentioned gas (G1) is consumed; and A protrusion (P3) integrally formed with the inner bag (2) and formed in a rib shape along the length direction of the inner bag (2); When the above-mentioned fuel gas (G1) is filled into the above-mentioned inner bag (2) without being filled with gas, the above-mentioned inner bag (2) expands by the pressure during filling, and the above-mentioned protruding part (P3) and the outer cylinder (1) contact with the inner surface of the inner bag (2), thereby forming a recess (10) on the inner bag (2).

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