JPH0318778Y2 - - Google Patents

Description

[Detailed explanation of the invention] A. Purpose of the invention (industrial application field) The gasket of the invention is used in a cutting device that cuts small high-pressure gas cylinders, and seals the cylinder sealing plate surface so that it does not remain inside the cylinder during cutting. This prevents gas leakage if gas is present.

(Prior art) Conventionally, in order to prevent gas from leaking when the cylinder is cut or when there is residual gas in the cylinder, an annular flat gasket has been used for cylinders with a flat sealing surface. If the outer surface of the sealing plate has irregularities due to processing, such as a caulked type sealing plate, there is a risk that the annular flat packing may deform and cause leakage. An O-ring is pressed against the outer circumferential portion of the vicinity.

In addition, Utility Model Publication No. 51-15903 describes synthetic resins and
An annular plate member 1 made of an elastic material such as synthetic rubber or metal is divided into two pieces 2 and 3 at an appropriate depth from the outer peripheral surface, and these two pieces 2 and 3 are divided into two pieces 2 and 3.
The pieces 2 and 3 are held together with an elastic ring 4 sandwiched between them.
These parts 2 and 3 are brought together and brought into contact 5.
A gasket is shown in which a hem portion 6 is formed by constricting and bending the elastic ring 4 between the elastic ring 4 and the outer peripheral surface.

(Problem that the invention aims to solve) If the cylinder sealing plate surface is not flat, if only a flat packing is used, internal pressure will pass through the gap between the puncture needle and the broken sealing plate and cause damage to the packing and the outer surface of the sealing plate. The gas leaked into the gap between the gaskets and acted on the gasket surface, deforming it and causing gas leakage.

Additionally, as shown in Figure 4, an O-ring is installed on the outer periphery of the cylinder near the sealing plate surface, and this O-ring and the outer periphery of the cylinder prevent the gas that is about to leak as described above. The devices that were designed to prevent this by close contact had the following drawbacks. That is,
The leaked gas is trapped in the gap between the sealing plate and the packing, and the pressure strongly opposes the force that tries to press the cylinder sealing plate against the packing, and the leaked gas pressure deforms the O-ring, causing the cylinder to close. The cylinder cannot be fed to a predetermined cut position due to the pressure applied to the outer circumferential surface. As a result, the sealing plate cannot be cut sufficiently, and even if the internal pressure is sufficient at the initial stage, as the internal pressure decreases, it becomes impossible to release the gas at the required flow rate.

Furthermore, in the gasket of Utility Model Publication No. 51-15903,
Since the portion housing the elastic ring 4 protrudes outward from the outer surfaces of the pieces 2 and 3, the portions 2 and 3 near the elastic ring 4 are fixed to the flat surface of the tube end before use. 4 parts of the elastic ring cannot be used repeatedly.

B. Structure of the invention (means for solving problems) The packing according to the invention includes an O-ring shaped part,
The flat annular flange is located on the outside in the direction perpendicular to the axis of the O-ring, and has a thickness equal to or less than the diameter of the cross section of the O-ring. It is made of the same material as the O-ring-shaped part, and is integrally molded so that one surface of the flat annular collar is continuous with the outer peripheral surface of the O-ring-shaped part on a tangent to the cross section of the O-ring-shaped part. It is characterized in that it is tightened between the needle body and the presser nut to keep the O-ring shaped part in a predetermined position.

(Function) In the packing according to the present invention, an O-ring-shaped portion is inserted around the puncture needle of the punching body of the cutting device, and the flat annular collar is compressed by the punching body and the presser nut. When the cylinder is fed into the cutting device, the sealing plate is first cut by the puncture needle, and then the outer surface of the sealing plate comes into pressure contact with the O-ring-shaped part, compressing and deforming the O-ring-shaped part, thereby preventing gas leakage. is prevented. When the cylinder is removed, the O-ring-shaped part returns to its original position and is ready for next use.

(Example) 1 is an O-ring-shaped portion, and 2 is a flat annular flange. This flat annular collar portion 2 is located on the outside in the direction perpendicular to the axis 3 of the O-ring portion 1, and its thickness T is less than or equal to the diameter D of the cross section of the O-ring portion 1. The O-ring shaped part 1 and the collar part 2 are made of an elastic material such as rubber or resin, and one surface of the flat annular collar is on a tangent to the outer peripheral surface of the O-ring shaped part in the cross section of the O-ring shaped part. It is molded in one piece so that it is continuous.

Reference numeral 4 designates a cylinder cutting device, which includes a main body 5, a puncture body 9 which is screwed into an opening 6 at the lower end of the main body, a puncture needle 7 protrudes from the lower end, and has a gas passage 8 on its axis; It is separately screwed together with the needle body 9, and the opening 10 at the upper end avoids the O-ring-shaped part 1 of the seal, and the flat plate-shaped annular flange of the seal is inserted between the upper end surface around this opening 10 and the lower end surface of the needle body 9. A presser nut 11 for fastening the portion 2 is provided. The upper end of the gas passage 8 communicates with the lower end of the gas passage 12 provided in the main body 5.

In the drawing, 21 is the cylinder, 22 is the sealing plate, 23
and 24 are gas vent holes communicating with each other, and 25 is a screw hole for attaching a cylinder drilled on the axis of the holding nut 11.

When using a cylinder, do the following: If the cylinder has a mounting screw on the neck, presser nut 1
Screw this onto 1. When the cylinder 21 is screwed in, the sealing plate 22 is cut by the puncture needle 7, and then the upper surface of the sealing plate 22 is pressed against the O-ring shaped part 1 of the gasket. Due to the initial cut of the sealing plate 22, the leaked gas leaks into the space surrounded by the O-ring shaped part 1, the puncture body 9, and the sealing plate 22, but the leaked gas acts on the cylinder 21. The pressure is known and does not interfere with the screwing operation of the cylinder 21 to a more sufficient sealing plate cut position. When the cylinder 21 reaches a predetermined position, the sealing plate 22 is sufficiently cut by the puncture needle 7, and the internal gas is guaranteed to flow out in a predetermined amount from the initial stage to the final stage.

If there are no mounting screws around the neck of the cylinder, place the cylinder in a case and screw the case onto the main body of the cutting device.The sealing plate will come into contact with the puncture needle, and if the cylinder is screwed in further, it will be cut. O-ring shaped part 1
In this case, too, the leaked gas does not exert enough pressure to interfere with the screwing operation of the case into a predetermined position.

By making the inner diameter d of the O-ring-shaped portion 1 approximately match the outer shape d of the puncture needle 7, the area where the pressure of the leaked gas acts on the surface of the sealing plate 22 can be reduced, and the predetermined cut position can be maintained from the time of initial cutting by the puncture needle. It becomes easier to insert the cylinder into the cylinder.

(Effects of the invention) According to the invention, the O-ring-shaped part can be fixed in a predetermined position by tightening the flat annular collar part between the piercing body and the holding nut, and repeated use is also possible. When the cylinder sealing plate is cut, the area where the leaked gas pressure acts on the cylinder can be reduced, and therefore the cylinder can be easily fed to the predetermined cut position, and the sealing plate can be sufficiently cut. Since the gas sealing surface is O-ring-shaped and has a nearly circular cross section, gas pressure is applied to the gasket at right angles when the cylinder seal is cut, resulting in various effects such as suppressing distortion of the gasket and achieving a perfect seal. play.

[Brief explanation of the drawing]

Figure 1 is a half-cut side view showing a specific example of the packing according to the present invention, Figure 2 is a bottom view of the same half, and Figure 3 is a bottom view of the same half.
The figure is a cutaway side view of the device in use, and FIG. 4 is an explanatory diagram of a conventional O-ring combination type cutting device in an incompletely opened state. 1... O-ring, 2... Flat annular collar, 3...
... Axis line, 4 ... cylinder cutting device, 9 ... needle punching body, 11 ... presser nut.

Claims (1)

[Claims for Utility Model Registration] (1) Comprising an O-ring-shaped portion and a flat annular flange, the flat annular flange is located on the outside in a direction perpendicular to the axis of the O-ring-shaped portion, It has a thickness less than or equal to the diameter of the cross section of the O-ring-shaped part, is made of the same material as the O-ring-shaped part, and one surface of the flat annular flange is in contact with the outer peripheral surface of the O-ring-shaped part in the cross-section of the O-ring-shaped part. A gasket characterized in that it is integrally molded so as to be continuous on a line, and is tightened between a punching body of a cylinder cutting device and a presser nut to keep an O-ring-shaped portion in a predetermined position. (2) The gasket according to claim 1, wherein the inner diameter of the O-ring-shaped portion substantially matches the outer diameter of a puncture needle for cutting the sealing plate.