JP6545536B2 - Cylinder sealing plug and cylinder sealing method using the sealing plug - Google Patents

Description

  The present invention uses a cylinder sealing plug that injects high-pressure gas from the gap between the opening of the gas cylinder body and the sealing plug, and welds the sealing plug to the cylinder body after injection, and seals the sealing plug. It relates to a cylinder sealing method.

  It is widely known that a high pressure gas is injected into a conventional small gas container, and then a sealing plate is welded to fill the gas. Such a method is easy to put to practical use because the material of the gas container is such as steel and the sealing plate is also steel, and the metal material having a large electric resistance is easy to be electrodeposited.

  For example, steel is often used for small gas cylinders used for portable instruments, but while it is inexpensive, it is heavy, and it is made of aluminum rather than steel when used in an environment such as near a beach. Excellent corrosion resistance. For this reason, a lightweight aluminum cylinder having corrosion resistance is required.

Unexamined-Japanese-Patent No. 2004-17048 JP, 2011-77715, A

  Generally, sealing of the gas cylinder after injecting the gas is carried out by electric welding, but in the case of aluminum, the electric resistance is small, and electric welding is quite difficult because the amount of heat generation by Joule heat is small.

  In the case of a metal material having a small electric resistance such as aluminum, it is necessary to flow a current five to ten times as much as that of steel in order to obtain a required calorific value. For this reason, an excessive current flows in the contact portion, and the metal of the contact portion melts to generate an arc, and so-called blow-off from which the melted metal is blown off easily occurs.

  Although Patent Documents 1 and 2 are not necessarily aluminum cylinder bodies, they may be applied in principle as a method of filling a cylinder body with high-pressure gas and thereafter welding a sealing plate to the cylinder body. . However, securing of the coaxiality of the welded portion is insufficient, and securing of the gas injection passage is not taken into consideration, and it is difficult to apply practically.

  The object of the present invention is to solve the above-mentioned problems and inject a high pressure gas into a cylinder body made of aluminum and use a cylinder sealing plug sealed by a sealing plug by electric welding and the sealing plug It is to provide a cylinder sealing method.

In order to achieve the above object, a cylinder sealing plug according to the present invention is mounted on a cylindrical opening of an aluminum cylinder body, and a gas is injected into the cylinder body from between the opening and the opening. An aluminum cylinder sealing plug for sealing the cylinder body, which is press-fit into a portion and welded by an electric current, and is a hollow portion provided in an axial direction, and a thin sealing plate for closing the hollow portion; A cylindrical welding portion for press-fitting into the mouth portion and welding a connection portion with the mouth portion, and an annular ring for electrode contact located on the rear end side of the welding portion and larger than the diameter of the welding portion And a short cylindrical gas injection part having a gas injection port located on the tip end side of the welding part, and the welding part formed on the gas injection part side and mounted on the opening of the welding part and a tapered surface to facilitate, and fitted into the hollow portion of the inner side of the welded portion And having a cylindrical sleeve body.

In the cylinder sealing method using the sealing plug according to the present invention, in the cylinder sealing method according to the present invention, the cylinder is provided between the opening provided at the opening of the cylinder made of aluminum and the sealing plug made of aluminum attached to the opening. In the cylinder sealing method of injecting a gas into the main body and electrically sealing the sealing plug to the opening to seal the sealing plug, the sealing plug closes the hollow portion provided in the axial direction and the inside of the hollow portion. A thin sealing plate, a cylindrical welding portion for press-fitting into the opening to weld a connection portion with the opening, and a rear end side of the welding portion, which is larger than the diameter of the welding portion An annular flange portion for electrode contact, a short cylindrical gas injection portion located on the tip side of the welding portion and having a gas injection port, and a separate cylinder fitted in the hollow portion inside the welding portion Temporary attaching step of contacting the welded portion with the inlet of the mouth portion Provisional the peripheral end portion of the gas injection unit while wearing contact with the tapered portion of the opening portion, and a parallel state in which a slight gap with the tapered surface of the welded portion and the tapered portion of the opening portion, wherein The gas injection step of injecting a high pressure gas into the cylinder body through the gas injection portion with a passage between the tapered portion and the tapered surface, and the final mounting of pressing the welded portion into the port immediately after the gas injection. At the same time or after the main mounting step, an electric welding step of instantaneously supplying a current to the contact portion between the welding portion and the mouth portion and welding the contact portion is characterized.

  According to the cylinder sealing plug and the cylinder sealing method using the sealing plug according to the present invention, the above-mentioned problems are eliminated, and the sealing plug of the same material is used for the opening of the cylinder made of aluminum. And seal by electric welding while injecting gas.

It is a side view of a cylinder main part in the state where a part was notched. It is a perspective view of a sealing plug. It is an expanded sectional view of a state where a sealing plug was temporarily attached to a mouth. It is a partially expanded sectional view of the state which mounted the sealing plug temporarily in the opening. It is a block diagram of a gas injection supply apparatus and a welding apparatus. It is a circuit block diagram for the electric current supply for carrying out electric welding. It is a flowchart figure of the process of the sealing method which injects gas in the inside of a cylinder main part, and seals with a sealing plug. It is explanatory drawing of the state which press-fits a sealing plug in an opening.

The present invention will be described in detail based on the illustrated embodiments.
FIG. 1 is a side view of a state in which a portion of an aluminum (including an aluminum alloy) cylinder body 1 filled with, for example, high pressure carbon dioxide gas is partially cut away. The cylinder body 1 is manufactured by forging or the like, and its size is, for example, a height of 145 mm and an outer diameter of 40 mm.

  The inner diameter of the cylindrical opening 1a of the cylinder body 1 is, for example, 6.5 mm and 10 mm in length, and the inner diameter is deformed by the current load on the welding machine and the pressure at the time of welding in the vicinity of the opening 1a. From the viewpoint of prevention, it is preferable to be as small as possible. On the other hand, from the viewpoint of securing a sufficient gas injection passage, the inner diameter is preferably as large as possible, and is preferably determined in consideration of the balance between the two. The taper angle of the tapered portion 1b formed on the upper portion, ie, the inlet side, of the mouth portion 1a and expanding upward is 45 degrees, and the axial length and radial size of the tapered portion 1b are 0.5 mm, for example. The angle is not limited to 45 degrees.

  The cylinder sealing plug 2 is inserted into the opening 1a and fixed by electric welding. The sealing plug 2 is disposed in the cylinder of the opening 1a and seals the opening 1a. In addition, a screw portion 1c for screwing an instrument when using a cylinder is formed around the mouth portion 1a, and a sealing plate described later of the sealing plug 2 is screwed with the screw portion 1c. The needle provided in the device is pierced, and the gas in the cylinder body 1 is discharged into the device from the opening 1a. Although FIG. 1 clearly shows the boundary between the opening 1a and the sealing plug 2 in the cross-sectional view for easy understanding, the boundary is actually unclear due to welding.

  FIG. 2 is a perspective view of the sealing plug 2, and FIG. 3 is an enlarged cross-sectional view of a state in which the sealing plug is temporarily attached to the opening. The base 2 a of the sealing plug 2 is an integrally formed article made of aluminum (including an aluminum alloy) having a shape having a cylindrical body or the like of a plurality of different diameter portions. The main body located at the center of the base 2a is a cylindrical welded portion 2b, which has, for example, a diameter of 7.5 mm and a height of 3.5 mm, and the diameter is smaller than the inner diameter of the opening 1a. It is preferable that the range is large. If the diameter of the weld 2b is too large, the press-in resistance becomes too large to be press-fit into the mouth 1a. If the diameter is too small, a sufficient contact pressure can not be obtained, and good electric welding can not be obtained.

  A tapered surface 2c having a taper angle corresponding to the tapered portion 1b of the opening 1a is formed in the lower part of the welding portion 2b to facilitate press-fitting of the welded portion 2b into the opening 1a.

  As also shown in FIG. 4, a short cylindrical gas injection portion 2d having a diameter of 6 mm and a height of 0.2 mm, for example, is provided on the tip end side of the welded portion 2b, that is, below. In this gas injection part 2d, a peripheral end 2e functioning to secure a gas injection passage in the gas injection step is brought into contact with the lower part of the taper part 1b of the opening 1a, and it comprises a plurality of notches. Gas inlets 2f are provided at equal intervals around the gas inlet 2d. The diameter of the gas injection portion 2d is often larger than the inner diameter of the opening 1a from the viewpoint of securing the peripheral end 2e in contact with the opening 1a, and the height is as high as possible for securing good welding. Lower is preferred. The width of the gas inlet 2f is preferably about 0.3 mm, and the number of the gas inlets 2 f is preferably large from the viewpoint of the gas injection time. A degree is preferred.

  A cylindrical guide portion 2g is provided below the gas injection portion 2d, and the guide portion 2g has, for example, a diameter of 5.5 mm and a height of 0.5 mm. The diameter of the guide portion 2g is smaller than the inner diameter of the opening 1a from the viewpoint of securing the coaxial to the opening 1a at the time of mounting the sealing plug 2 and not contacting the opening 1a when the sealing plug 2 inclines. Therefore, the larger one is preferable. Further, from the viewpoint of securing the gas injection passage and easiness of mounting of the sealing plug 2, it is optimum that the diameter is smaller by about 0.5 mm than the diameter of the opening 1 a. The height of the guide portion 2g is preferably as large as possible from the viewpoint of securing the coaxiality to the opening portion 1a at the time of mounting of the sealing plug 2, and as small as possible from the easiness of mounting. It is optimal.

  In addition, a cylindrical guide pin portion 2h having a diameter of 5.5 mm and a height of 2.6 mm, for example, is provided below the guide portion 2g. The diameter of the guide pin portion 2h is a mouth portion in order to prevent the falling from the temporary attachment step to the full attachment step of the sealing plug 2 and to prevent the outer periphery from contacting the opening portion 1a even when the sealing plug 2 is inclined. It is preferable to be as large as possible within a range sufficiently smaller than the inner diameter of 1a. The diameter of the guide pin portion 2h is preferably as small as possible from the viewpoint of securing the gas injection passage and ease of pin attachment, and it is preferable that the diameter of the guide pin portion 2h be smaller by about 2 mm than the inner diameter of the opening 1a.

  The guide portion 2g and the guide pin portion 2h are portions to be inserted into the mouth portion 1a in a state in which the sealing plug 2 is temporarily attached. By providing the guide portion 2g and the guide pin portion 2h in two stages at the time of temporary attachment of the sealing plug 2, easiness of attachment of the sealing plug 2, prevention of falling, and coaxiality with the opening 1a can be secured. The guide portion 2g and the guide pin portion 2h can be omitted if there is a guarantee that the sealing plug 2 is properly temporarily mounted.

  The central portion of the base 2a of the sealing plug 2 is hollow, and the inside of the hollow portion is closed by a thin sealing plate 2i having a thickness of, for example, 0.5 mm provided in the middle, and the hollow portion above the sealing plate 2i is sealed A separate cylindrical sleeve 21 having an outer diameter of 3.1 mm for reinforcement is fitted in the lower part of the lower hollow portion 2k. The sleeve 2l is preferably made of aluminum which is the same material as the base 2a, and a small gas discharge hole 2m having a diameter of 0.5 mm in the axial direction is provided inside the sleeve 2l. The sleeve 21 is inserted after the hollow portion 2k is pierced to form the sealing plate 2i. Then, it is preferable to provide a gap of about 3 mm between the sealing plate 2i and the upper end of the sleeve 2l so that the tip of the needle that pierces the sealing plate 2i for gas ejection does not reach the sleeve 2l.

  An annular flange portion 2n for electrode contact is provided on the upper portion of the base 2a on the upper end side of the welded portion 2b, and the flange portion 2n has a diameter of 10 mm and a thickness of 3 mm, for example. If the diameter of the flange portion 2n is small, sufficient contact area and contact strength can not be obtained at the contact surface with the upper electrode described later, and the inlet current of the opening 1a can not be sufficiently covered. It is easy for the weld to detonate.

  Therefore, it is preferable that the diameter of the flange portion 2n be sufficiently larger than the diameter of the welded portion 2b, and have a sufficient contact area and contact strength with the upper electrode. As a result, the flange portion 2 n can sufficiently suppress the detonation that overflows during welding, that is, the flowing metal burr, and a sufficient pressing force at the time of transition from temporary attachment of the sealing plug 2 described later to full attachment. Can be given.

  FIG. 5 is a configuration diagram of a gas injection device and a welding device used in the case where gas is injected into the cylinder main body 1 and the port portion 1 a is sealed by electric welding using the sealing plug 2. At the time of gas injection, the cylinder body 1 in the welding state is supported from below at the bottom thereof, and a clamp 11 is provided, which is raised and lowered by a hydraulic cylinder, for example. A gas supply 13 is provided which is surrounded by 12. The packing 12 is fixed to the supply unit main body 14, the gas supply pipe 15 is connected to the supply main body 14 from the side, and the gas supply pipe 15 is opened and closed between the gas supply source (not shown) It is supposed to be.

  Further, insertion holes 17 are formed in the packing 12 and the supply portion main body 14 in the vertical direction, and the upper electrode 18 is moved up and down in the insertion holes 17. Furthermore, the lower electrode 19 is attached and arranged on the side of the cylinder main body 1 in this state.

  FIG. 6 is a circuit diagram for inserting the sealing plug 2 into the opening 1a of the cylinder main body 1 and performing electric welding. A power supply is connected to the cylinder body 1, the upper electrode 18 fixed to the sealing plug 2, and the lower electrode 19 via a welding transformer 21. A single-phase or three-phase electric wire is connected to a power supply 22 that integrates a rectifier circuit, a constant voltage circuit and a control circuit, a capacitor 23 is connected in parallel to the output of the power supply 22, and a storage diode 24 and a discharge diode. 25 is connected to the welding transformer 21.

  FIG. 7 is a flow chart of the process of the cylinder sealing method in which gas is injected into the cylinder body 1 and the sealing plug 2 is welded and sealed in the opening 1a. For example, in each device, the operation of the next series of steps is automatically performed according to a predetermined program.

  [First Step: S1] At the time of gas injection and welding, the opening 1a of the cylinder body 1 is directed upward, and the sealing plug 2 is set at the inlet of the opening 1a. However, in the first step S1, the sealing plug 2 is only in contact with the opening 1a, and is not inserted into the opening 1a.

  [Second step: S2] Attach the bottom of the cylinder main body 1 to the clamp 11 and push up the clamp 11 to surround the periphery of the opening 1a with the packing 12 of the gas supply device 13, and inside the gas supply device 13. Insert from below. The gas supply device 13 is sealed from the periphery of the mouth 1 a of the cylinder body 1 by the packing 12 and an O-ring provided at a necessary place. Further, the lower electrode 19 is attached to the middle portion of the cylinder body 1.

  [Third Step: S3] When the upper electrode 18 in the gas supply device 13 is depressed by a predetermined distance, the upper electrode 18 contacts the upper portion of the flange portion 2n of the sealing plug 2, and the sealing plug 2 is depressed downwards each time It is put on temporarily. In this temporarily mounted state, as shown in FIG. 3, the guide pin portion 2h and the guide portion 2g of the sealing plug 2 are pushed into the mouth 1a, and the peripheral end 2e of the gas injection portion 2d is a tapered portion of the mouth 1a A parallel gap is formed between the tapered surface 2c of the welded portion 2b and the tapered portion 1b of the opening 1a while being in contact with the lower portion of 1b. The temporary attachment and the final attachment described later can also be performed by moving the sealing plug 2 relative to the upper electrode 18.

  [Fourth Step: S4] In the temporarily mounted state in the third step S3, the gas on-off valve 16 connected to the external gas supply source is opened to introduce a high pressure gas into the gas supply device 13. The high pressure gas introduced into the gas supply device 13 further passes through the gap between the tapered surface 2c and the tapered portion 1b, and is injected into the cylinder main body 1 through the gas injection port 2f of the gas injection portion 2d.

  [Fifth Step: S5] In view of the end of gas injection into the cylinder body 1 in the fourth step S4, immediately after that, the upper electrode 18 is further lowered to push the flange portion 2n of the sealing plug 2 downward. As shown in FIG. 8, the diameter of the welded portion 2 b is narrowed by using the tapered surface 2 c as a guide, and the welded portion 2 b is forcibly inserted into the mouth portion 1 a while the mouth portion 1 a is expanded. At this time, the sleeve 21 plays a role of reinforcement so that the diameter of the welded portion 2b does not become smaller than necessary.

  [Sixth Step: S6] With the start of press-fitting of the sealing plug 2, the discharge diode 25 is operated to instantaneously flow a current between the upper electrode 18 and the lower electrode 19. This current is obtained by the welding transformer 21 and the power supply 22 shown in FIG. By discharging the charge stored in the capacitor 23, a current of several tens of thousands of amps flows between the upper electrode 18 and the lower electrode 19a, although the voltage is several volts, and the contact between the welded portion 2b and the opening 1a Concentrate, heat and weld the connection and its surroundings with Joule heat.

  Furthermore, the upper electrode 18 is pushed down until the sealing plug 2 is completely mounted in the full state during energization. Due to the sealing by welding of the sealing plug 2, high pressure gas inside does not leak from the opening 1 a. At this time, the flange portion 2 n also functions as a stopper for preventing the sealing plug 2 from excessively entering the opening portion 1 a. The sixth step S6 may be performed at the same time as the main attachment by press-fitting of the sealing plug 2 in the fifth step S5 is finished.

  [Seventh Step: S7] After the fifth step S5 and the sixth step S6 are completed, the gas on-off valve 16 is closed to stop the supply of gas into the gas supply device 13. At the same time, the upper electrode 18 is raised, the lower electrode 19 is removed, and the clamp 11 is further lowered to release the seal around the mouth 1 a of the cylinder body 1. Next, the cylinder main body 1 shown in FIG. 1 in which the filling of the high pressure gas is completed is taken out from the clamp unit 11.

  Thus, while screwing the used device to the screw portion 1c around the mouth portion 1a with respect to the cylinder main body 1 filled with the high pressure gas, the seal plate 2i of the sealing plug 2 is pierced by the needle of the used device The high-pressure gas in the cylinder body 1 is discharged to the outside through the gas discharge hole 2m of the sleeve 2l of the sealing plug 2, and this gas can be used in the apparatus used.

DESCRIPTION OF SYMBOLS 1 cylinder main body 1a opening 1b taper part 2 sealing plug 2a base 2b welding part 2c taper surface 2d gas injection part 2e peripheral end 2f gas injection port 2g guide part 2h guide pin part 2i sealing plate 2l sleeve 2m gas discharge hole 2n Flange part 13 Gas supply device 16 Gas on-off valve 18 Upper electrode 19 Lower electrode 22 Power supply

Claims (3)

Attached to the cylindrical mouth of the cylinder body made of aluminum, and inject gas into the cylinder body from between the mouth and press-fitting it into the mouth and welding by electric current to seal the cylinder body A hollow cylinder sealing plug made of aluminum, a thin-walled sealing plate for closing the hollow portion, and a connecting portion between the opening and the opening by press-fitting. A cylindrical welding portion to be welded, an annular flange portion for electrode contact located on the rear end side of the welding portion and larger than the diameter of the welding portion, and a gas injection port located on the front end side of the welding portion A short cylindrical gas injection portion having a tapered portion , a tapered surface formed on the gas injection portion side of the weld portion to facilitate attachment of the weld portion to the port, and the hollow portion inside the weld portion A cylinder seal characterized by having a separate cylindrical sleeve inserted into the Plug. Gas is injected into the cylinder body from between an opening provided at the opening of the aluminum cylinder body and an aluminum sealing plug attached to the opening, and the sealing plug is electrically connected to the opening In the cylinder sealing method of welding and sealing, the sealing plug includes a hollow portion provided in the axial direction, a thin sealing plate for closing the hollow portion, and the opening portion by press-fitting into the opening portion. A cylindrical welding part for welding the connection part between each other, an annular flange part for electrode contact located on the rear end side of the welding part and larger than the diameter of the welding part, and a tip side of the welding part A short cylindrical gas inlet portion having a gas inlet and a separate cylindrical sleeve fitted in the hollow portion inside the weld portion, the weld portion being in contact with the inlet of the port portion contact a temporary attachment process, the gas injection unit while the temporary mounting the peripheral edge portion of the opening Contact with the chromatography path portion, and a parallel state in which a slight gap with the tapered surface of the welded portion and the tapered portion of the opening portion, between the tapered portion and the tapered surface and a passage, high pressure through the gas injection section The gas injection step of injecting a gas into the cylinder body, the main mounting step of pressing the welded portion into the port immediately after the gas injection, the welded portion and the port simultaneously with or after the main mounting step An electric welding step of causing an electric current to instantaneously flow to a contact portion between the electric part and the electric contact portion and welding the contact portion, and a cylinder sealing method using a sealing plug. In contact with one electrode to the cylinder body, contacts the other electrode to the flange portion of the sealing plug from between the electrodes according to claim 2, characterized in that supply current to the contact portion Cylinder sealing method using a sealing plug.

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