JP2011220439A - Airtight structure of tubular sliding member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an airtight structure of a tubular sliding member that facilitates adjusting a gap between an inner tube and an outer tube and reliably maintains airtightness, and also dust or the like due to wear is not scattered to the periphery, thus can be used reasonably even for use unfavorable to contamination due to dust or the like.SOLUTION: The airtight structure of the tubular sliding member includes a pedestal composed of the inner tube and an elastic tubular body stacked on the inner tube, and the outer tube attached to the outer side of the pedestal via a pair of spacers so as to have a predetermined gap, the pair of spacers is disposed on both sides of an elastic tubular body, and then O-ring packing moves on the elastic tubular body of the pedestal while rotating along the longitudinal direction of the elastic tubular body as the pedestal and the outer tube move relatively with the O-ring packing sandwiched between the elastic tubular body and the outer tube.

Description

TECHNICAL FIELD The present invention relates to an airtight structure of a cylindrical sliding member, and more particularly to an airtight structure of a cylindrical sliding member used for maintaining the airtightness of a cylindrical sliding member that is attached to an opening of a container and that can open and close the opening. Concerning structure.

Conventionally, as the airtight structure of the cylindrical sliding member used for maintaining the airtightness of the cylindrical sliding member, a circumferential groove is formed on the opposing surface of either the inner cylinder or the outer cylinder, and O A structure containing a ring packing is well known.

However, when the inner cylinder and the outer cylinder are frequently slid, the O-ring packing stored in the circumferential groove is worn out and the airtightness is deteriorated at an early stage or due to wear. There has been a drawback that dust and the like are easily scattered around and cause various problems.
Further, in the O-ring packing that is sandwiched between the inner cylinder and the outer cylinder without a circumferential groove, it is necessary to adjust the gap between the inner cylinder and the outer cylinder very accurately, and the gap is large. It is difficult to maintain the airtightness, and if the gap is small, the deformation of the O-ring packing becomes large, and the problem that the airtightness cannot be maintained occurs.

Nothing in particular

As described above, in the conventional airtight structure of the cylindrical sliding member in which the O-ring packing is interposed between the inner cylinder and the outer cylinder, the adjustment of the gap between the inner cylinder and the outer cylinder is simple and airtight. It has not been possible to obtain a hermetic structure of a cylindrical sliding member that can reliably hold.
Further, the conventional airtight structure of the cylindrical sliding member has a problem that dust and the like due to wear dissipate to the periphery and various problems occur, and it cannot be used for applications that dislike contamination by dust and the like.

Therefore, the object of the present invention is to easily adjust the gap between the inner cylinder and the outer cylinder, and to reliably maintain airtightness, and to prevent dust and the like due to wear from being scattered to the surroundings. It is an object of the present invention to provide an airtight structure of a cylindrical sliding member that can be used without difficulty even in applications that dislike the above.

The present invention employs the following technical means in order to achieve the above-described problems.
The technical means of the airtight structure of the cylindrical sliding member according to claim 1 includes a pedestal comprising an inner cylinder, an elastic cylindrical body laminated on the inner cylinder, and a pair of spacers outside the pedestal. And a pair of spacers disposed on both sides of the elastic cylindrical body, and an O-ring between the elastic cylindrical body and the outer cylinder. As the pedestal and the outer cylinder move relative to each other with the packing interposed therebetween, the O-ring packing moves on the elastic cylindrical body of the pedestal along the length direction of the elastic cylindrical body. It is characterized by moving while rotating.

The technical means of the airtight structure of the cylindrical sliding member according to claim 2 is characterized in that a check valve is attached to the inner cylinder and a bag-like gas leakage prevention container is attached to the outer cylinder. It is a feature.

The technical means of the airtight structure of the cylindrical sliding member according to claim 3 is characterized in that the check valve is a cylindrical structure made of an elastic body having one end opened and the other end closed in a dome shape. A slit is formed, and the slit is opened by pressure from the inside, and is not opened by pressure from the outside.

The technical means of the airtight structure of the cylindrical sliding member according to claim 4 is characterized in that the gas leakage prevention container has a laminated structure of a plastic film layer and a metal thin film, and the plastic film layer portion is fused to the outer cylinder. It is also characterized by this.

The technical means of the airtight structure of the cylindrical sliding member according to claim 5 is characterized in that the outer cylinder is formed with a plurality of circumferential grooves in its length direction.

According to the first aspect of the present invention, adjustment of the gap between the inner cylinder and the outer cylinder is simple, and airtightness can be reliably maintained, and dust due to wear is not dissipated to the periphery, so It has become possible to provide an airtight structure of a cylindrical sliding member that can be used without difficulty even in applications that dislike contamination caused by the above.
According to the invention of claim 2, a check valve is attached to the inner cylinder, and a bag-like gas leakage prevention container is attached to the outer cylinder, respectively, for a liquid containing a gas such as hydrogen or oxygen. It can be suitably used as an airtight structure of the container.
According to the invention of claim 3, the check valve has a cylindrical structure made of an elastic body having one end opened and the other end closed in a dome shape, and a slit is formed in the dome portion. It opens with the pressure from the inside and does not open with the pressure from the outside, and can be suitably used as an airtight structure of a liquid container containing a gas such as hydrogen or oxygen.
According to a fourth aspect of the present invention, the gas leakage prevention container has a laminated structure of a plastic film layer and a metal thin film, and the plastic film layer portion is fused to the outer cylinder, thereby providing a more airtight hydrogen. It has become possible to provide an airtight structure of a container for a liquid containing a gas such as oxygen or oxygen.
According to the invention of claim 5, the outer cylinder is formed with a plurality of circumferential grooves in the length direction thereof, and the airtight structure of a liquid container containing a gas such as hydrogen or oxygen having a higher airtightness. Can now be provided.

It is sectional drawing which shows embodiment of the airtight structure of the cylindrical sliding member of this invention. It is an expanded sectional view of an outer cylinder. It is an expanded sectional view of a lid part. It is an expanded sectional view of a cap. It is an expanded sectional view of an inner nozzle. It is an expanded sectional view of a presser ring. It is an expanded sectional view of an inner cylinder. It is an expanded sectional view of a check valve.

Embodiments of the airtight structure of the cylindrical sliding member of the present invention will be described below in detail with reference to the drawings.
1 to 8, the airtight structure 11 of the cylindrical sliding member of the present invention is for attaching the cylindrical sliding member 22 to the gas leakage preventing container 21, and the elastic cylindrical sliding member 22. Is designed to keep the airtight state securely.
The gas leakage prevention container 21 is a bag-shaped container having a laminated structure of a plastic film layer and a metal thin film, and the plastic film layer portion is fused to the outer surface of the outer cylinder 33 constituting the cylindrical sliding member 22. By doing so, the said cylindrical sliding member 22 is attached.

As shown in FIG. 1, the cylindrical sliding member 22 includes an inner cylinder 31 (see FIG. 7) made of an aluminum material, other metal, plastic, or the like, and silicon rubber laminated on the inner cylinder 31. And a pedestal 30 made of an elastic cylindrical body 32 made of the like. An outer tube 33 made of metal or the like made of an aluminum material, other metal, plastic, or the like is attached to the outside of the base 30 through a pair of spacers so as to have a predetermined interval.
The pair of spacers are arranged at the ring-shaped lid 34 of the outer cylinder 33 arranged at the outer end of the elastic cylindrical body 32 on the outer periphery of the inner cylinder 31 and at the inner end of the elastic cylindrical body 32. An O-ring packing 36 is sandwiched between the elastic cylindrical body 32 and the outer cylinder 33.

In the cylindrical sliding member 22 having the above-described configuration, the O-ring packing 36 is placed on the elastic cylindrical body 32 of the pedestal 30 as the pedestal 30 and the outer cylinder 33 relatively move. Are moved while rotating along the length direction of the elastic cylindrical body 32.
By making the O-ring packing 36 slightly harder than the elastic cylindrical body 32, the O-ring packing 36 rotates along the length direction of the elastic cylindrical body 32 with almost no deformation. Move while.
Accordingly, the airtightness between the pedestal 30 and the outer cylinder 33 is reliably maintained, and dust and the like due to wear are not dissipated to the periphery, so that it can be used without difficulty for applications that dislike contamination due to dust and the like. .

The outer cylinder 33 of the cylindrical sliding member 22 is formed with a plurality of circumferential grooves 37 in the length direction thereof as shown in FIG. In the figure, three circumferential grooves 37 are formed.
The relationship between the depth and width of the circumferential groove 37 is approximately 1: 3, and the plastic film layer portion of the gas leakage prevention container 21 is used as the outer surface of the outer cylinder 33 constituting the cylindrical sliding member 22. When the gas leakage preventive container 21 having a laminated structure of a plastic film layer and a metal thin film enters the circumferential groove 37 in a bent state, it is fused.
Therefore, the plastic film layer portion of the gas leakage prevention container 21 is firmly fused and connected to the outer surface of the outer cylinder 33 constituting the cylindrical sliding member 22.

As shown in FIG. 3, the ring-shaped lid portion 34 of the outer cylinder 33 has a cylindrical structure having a step 41 made of a molded product made of black polypropylene, and an inner cylinder 31 is fitted on the inside thereof. In addition, an outer cylinder 33 is fitted into the small diameter portion of the step 41. Reference numeral 42 denotes a hollow portion formed in the large diameter portion of the step 41, which can be attached to the outer cylinder 33 with elasticity and can be reduced in weight.

As shown in FIG. 4, a plastic cap 51 such as polyethylene having a knob 52 is attached to the end of the inner cylinder 31.
The cap 51 has a rod-shaped main body 53 having a diameter smaller than that of the knob 52. A pair of ring-shaped concave grooves 54 are provided on the outer periphery of the cap 51, and an O-ring 55 is accommodated in each concave groove 54. is there.
The cap 51 has the rod-shaped main body 53 fitted into an inner nozzle 56 attached to the inner periphery of the tip of the inner cylinder 31, and the O-ring 55 slides while contacting the inner surface of the inner nozzle 56 so as to maintain airtightness. It has become.

As shown in FIG. 5, the inner nozzle 56 is preferably made of a plastic such as polyethylene, and its inner peripheral surface is formed in a taper shape that slightly expands toward the tip side. While being able to fit, it is comprised so that airtightness can be reliably hold | maintained between the said O-rings 55. FIG.

The presser ring 35 disposed at the inner end of the elastic cylindrical body 32 is provided with a step on the inner peripheral side of the rear end of the inner cylinder 31 as shown in FIG. The rear end portion of the inner cylinder 31 comes into contact with the step portion of the small diameter portion 57.
Note that a flange portion 62 of a check valve 61 described later is interposed at a portion where the stepped portion of the small diameter portion 57 and the rear end portion of the inner cylinder 31 abut, and the check valve 61 is securely held. It is like that.

As shown in FIG. 8, the check valve 61 installed in the inner cylinder 31 includes a cylindrical main body 63 made of an elastic body having one end opened and the other end closed like a dome. A slit 65 is formed.
The slit 65 is opened by pressure from the inside and is not opened by pressure from the outside.

Therefore, the gas leakage prevention container 21 is not only kept airtight by the check valve 61 but also the gas leakage prevention container 21 is filled with a liquid containing a gas such as hydrogen or oxygen. Even when the cylinder 31 needs to be attached to or detached from the outer cylinder 33, the airtight structure 11 of the cylindrical sliding member of the present invention does not impair the airtightness, and the liquid container contains a gas such as hydrogen or oxygen. It is possible to provide an airtight structure of a cylindrical sliding member that can be suitably applied to the above.

When utilizing the airtight structure of the cylindrical sliding member of the present invention, the inner cylinder 31 is removed from the outer cylinder 33, and a liquid containing a gas such as hydrogen or oxygen is introduced into the gas leakage prevention container 21 from the opening. Fill. Thereafter, when the inner cylinder 31 is attached to the outer cylinder 33, the assembly is completed.
In this state, the liquid containing gas such as hydrogen and oxygen filled in the gas leakage prevention container 21 is not only kept airtight by the check valve 61 but also by the cylindrical sliding member 22. Airtightness is maintained, and gas such as hydrogen or oxygen does not leak from the gas leakage prevention container 21.

When a liquid containing a gas such as hydrogen or oxygen filled in the gas leakage prevention container 21 is used, the cap 51 is pulled out from the inner nozzle 56 by pulling the knob 52 of the cap 51 to prevent the gas leakage. Only pressure is applied from the outside of the container 21.
By doing so, the slit 65 formed in the dome portion 64 of the check valve 61 is automatically opened, and the liquid containing gas such as hydrogen or oxygen filled in the gas leakage prevention container 21 is supplied to the inner nozzle 56. Can be released without difficulty.

When pressure is no longer applied from the outside of the gas leakage prevention container 21, the slit 65 formed in the dome portion 64 of the check valve 61 is automatically closed, so that outside air is introduced into the gas leakage prevention container 21. There is no risk of entering.
When the use is finished, the cap 51 may be mounted in the inner nozzle 56. Of course, since the O-ring 55 is attached to the outer periphery of the rod-like main body 53 of the cap 51, leakage of gas such as hydrogen and oxygen can be prevented.

The airtight structure of the cylindrical sliding member of the present invention can be suitably applied as an airtight structure for a liquid bag-like gas leakage prevention container containing a gas such as hydrogen or oxygen.
In addition, the airtight structure of the cylindrical sliding member for a wide variety of applications for various articles other than the bag-like gas leakage prevention container for liquids containing gas such as hydrogen and oxygen Can be used as

11 Airtight structure 21 of cylindrical sliding member 21 Gas leakage prevention container 22 Cylindrical sliding member 30 Base 31 Inner cylinder 32 Elastic cylindrical body 33 Outer cylinder 34 Lid 35 Presser ring 36 O-ring packing 37 Circumferential groove 41 Step 42 Hollow Portion 51 Cap 52 Knob 53 Bar-shaped body 54 Groove 55 O-ring 56 Inner nozzle 57 Small diameter portion 61 Check valve 62 Flange portion 63 Tubular body 64 Dome portion 65 Slit

Claims (5)

A pedestal composed of an inner cylinder, an elastic cylindrical body laminated on the inner cylinder, and an outer cylinder attached to the outside of the pedestal via a pair of spacers so as to have a predetermined interval; A pair of spacers are arranged on both sides of the elastic cylindrical body, and an O-ring packing is sandwiched between the elastic cylindrical body and the outer cylinder so that the base and the outer cylinder move relatively. In connection with this, the O-ring packing moves on the elastic cylindrical body of the pedestal while rotating along the length direction of the elastic cylindrical body. Airtight structure. The airtight structure of the cylindrical sliding member according to claim 1, wherein a check valve is attached to the inner cylinder, and a bag-like gas leakage prevention container is attached to the outer cylinder. The check valve has a cylindrical structure made of an elastic body having one end opened and the other end closed in a dome shape. A slit is formed in the dome, and the slit is opened by pressure from the inside, and from the outside. The airtight structure of the cylindrical sliding member according to claim 2, wherein the airtight structure is configured not to open at a pressure of 5 mm. The airtightness of the cylindrical sliding member according to claim 2, wherein the gas leakage prevention container has a laminated structure of a plastic film layer and a metal thin film, and the plastic film layer portion is fused to the outer cylinder. Construction. The airtight structure of the cylindrical sliding member according to claim 4, wherein the outer cylinder is formed with a plurality of circumferential grooves in a length direction thereof.

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