JP5223766B2 - Packing for pressure vessel - Google Patents

Description

  The present invention relates to a pressure vessel packing for holding a pressure vessel in an airtight manner.

  In a pressure vessel provided with a container body having an opening and a door for closing the opening, a packing is fitted into a groove provided in the container body so as to surround the opening, and gas is supplied to the bottom surface side of the groove. Discloses a technique for pushing out the packing and bringing it into contact with the door to keep the inside of the pressure vessel airtight (see Patent Documents 1 and 2). After the use of the pressure vessel is completed, gas is discharged from the bottom surface side of the groove and the packing is pulled into the groove to separate the door from the door and release the pressure vessel, and then the door can be opened. Has been.

  The packings disclosed in Patent Documents 1 and 2 adjust the pressure applied to the bottom of the groove by making two bottom surfaces spaced in the width direction abut against the inner surface of the groove and making the bottom of the groove groove airtight. It is comprised so that it can contact / separate with respect to a door. However, the packing disclosed in Patent Documents 1 and 2 has a problem that when the packing is worn by use, the contact between the groove and the packing is not ensured, and the bottom of the groove cannot be maintained. there were. In particular, the packing disclosed in Patent Document 1 has a thin corner formed at the bottom of the side surface, and the deformation of the packing increases when retracted, so that gas leakage occurs between the packing and the groove. There was a problem that the packing could not be fully retracted. Furthermore, there is a possibility that the airtightness inside the pressure vessel cannot be maintained due to insufficient airtightness at the bottom of the groove and insufficient contact between the packing and the door. .

  In addition, since the packings disclosed in Patent Documents 1 and 2 have a flat surface that comes into contact with the door, the packing easily sticks to the door while being in surface contact, and the packing cannot be pulled into the groove. There was a problem. Furthermore, when the door is opened with the packing stuck to the door, there is a problem that the packing is detached from the groove. Further, in a pressure vessel to which a sliding door is applied as a door, if the door is slid while the packing is exposed from the groove, the packing may be caught in the door and detached from the groove.

JP 2004-222940 A JP 11-336915 A

  The problem to be solved by the present invention is to provide a pressure vessel packing capable of maintaining airtightness even when worn due to use while maintaining reliable contact with the inner surface of the groove.

  This invention was made in order to solve the above-mentioned subject, and invention of Claim 1 is packing provided in a pressure vessel provided with a container main part which has an opening, and a door which closes the opening, An in-groove pressure chamber that is fitted into an annular groove provided in one of the container main body and the door so as to surround the opening and is hermetically formed between a bottom surface and an inner surface of the groove. Depending on the pressure applied to the bottom surface, it is possible to advance in a direction away from the bottom surface and to retreat in a direction close to the bottom surface, and abuts against the other of the door and the pressure vessel when it is most advanced. The pressure vessel is configured to be airtight, the front surface contacting the other, the two side surfaces extending rearward from both sides of the front surface and spaced apart from each other in the width direction, Pair with front A rear surface that is widened at a predetermined taper angle toward the rear and connected to the rear surface, and is provided with a taper surface extending in the longitudinal direction. The rear surface has a predetermined rear surface. A pressure vessel packing having a V-groove extending in the longitudinal direction and having a taper angle larger than the slit angle when not inserted into the concave groove. It is.

  According to the first aspect of the present invention, it is possible to provide a pressure vessel packing that can maintain airtightness even when worn due to use while maintaining reliable contact with the inner surface of the groove.

  According to a second aspect of the present invention, a straight surface that connects the front surface and the tapered surface and is formed in parallel with the inner surface of the concave groove is provided on the side surface, and is inserted into the concave groove. In a state where the width at the straight surface is smaller than the width of the concave groove, the width at the rear end of the tapered surface is larger than the width of the concave groove, and is not inserted into the concave groove. In a cross-sectional view perpendicular to the longitudinal direction, toward a straight line connecting a first intersection that is an intersection of the front surface and one of the side surfaces, and a second intersection that is an intersection of the rear surface and the one of the side surfaces, 2. The pressure vessel according to claim 1, wherein a length of a perpendicular extending from a third intersection that is an intersection of the straight surface and the tapered surface on the other side surface is longer than a width of the concave groove. It is packing.

  According to the second aspect of the present invention, the inner surface of the concave groove is linearly contacted to improve airtightness while reducing the sliding resistance when moving forward and backward, and further caught in the concave groove during the forward and backward movement. It is possible to provide a packing for a pressure vessel that is not likely to stick.

  According to a third aspect of the present invention, in the state where the front surface has a predetermined radius of curvature in a cross-sectional view perpendicular to the longitudinal direction and is not inserted into the concave groove, the radius of curvature is the width of the concave groove. The pressure vessel packing according to claim 2, wherein the packing is larger than half of the pressure vessel.

  According to the invention described in claim 3, there is no possibility of causing a pull-in failure due to sticking to the door or the container main body when pulling in while improving the air tightness by bringing the front surface into a linear contact with the door or the container main body. A packing for a pressure vessel can be provided.

  The invention described in claim 4 is the pressure vessel packing according to any one of claims 1 to 3, wherein a distance between the front surface and the rear surface is shorter than a depth of the concave groove.

  According to the fourth aspect of the present invention, it is possible to provide a pressure vessel packing that is not involved in opening the door and is not likely to be detached from the groove.

  According to the present invention, it is possible to provide a pressure vessel packing capable of maintaining airtightness even when worn by use while maintaining reliable contact with the inner surface of the concave groove.

It is sectional drawing of the packing for pressure vessels which concerns on embodiment of this invention. It is sectional drawing explaining the use condition of the packing for pressure vessels which concerns on embodiment of this invention. It is an expanded sectional view explaining the shape and position in the use condition of the packing for pressure vessels which concerns on embodiment of this invention. It is sectional drawing when the packing for pressure vessels which concerns on embodiment of this invention rotates centering on a longitudinal direction in the state inserted by the ditch | groove.

  Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of a pressure vessel packing according to an embodiment of the present invention. 2 is a cross-sectional view for explaining the use state of the pressure vessel packing according to the embodiment of the present invention, and FIG. 3 shows the shape and position of the pressure vessel packing according to the embodiment of the present invention in use state. It is an expanded sectional view explaining these. FIG. 4 is a cross-sectional view when the pressure vessel packing according to the embodiment of the present invention is rotated about the longitudinal direction in a state where the pressure vessel packing is fitted in the groove. 1 to 4, the upper side in the drawings indicates the front, and the lower side indicates the rear.

  The pressure vessel packing 1 according to the present embodiment is formed in an annular shape, and a cross section perpendicular to the longitudinal direction is shown in FIG. The pressure vessel packing 1 includes a front surface 2, two side surfaces 3 a and 3 b that extend backward from both sides of the front surface 2 and are spaced apart from each other in the width direction, and a rear surface 4 that faces the front surface 2. Each of the side surfaces 3a and 3b is provided with a taper surface 31 that is widened at a predetermined taper angle b toward the rear and is connected to the rear surface 4 and extends in the longitudinal direction. The rear surface 4 has a predetermined rear surface. A V-groove 41 that opens at the slit angle a and extends in the longitudinal direction is provided. That is, the rear portion of the pressure vessel packing 1 is divided into the legs 8 a and the legs 8 b by the V groove 41. In addition, straight surfaces 32 that connect the front surface 2 and the tapered surface 31 and are formed in parallel with the inner surface of the concave groove into which the pressure vessel packing 1 is inserted are formed on the side surfaces 3a and 3b, respectively. Since the straight surface 32 is formed on the front side of the side surfaces 3a and 3b of the pressure vessel packing 1, an elastic restoring force can be sufficiently applied when the legs 8a and 8b are bent.

  2 and 3 show the pressure vessel packing 1 fitted in a concave groove 51 provided in the vessel body 5. The container body 5 has an opening 56 for accessing the inside of the pressure container, and the container body 5 is provided with an annular concave groove 51 so as to surround the opening 56. Moreover, the door 6 which closes the opening 56 is provided, and in this Embodiment, the door 6 engages with the guide groove 55 provided in the container main body 5, and moves slidably in the direction perpendicular to the drawing. It is configured as follows. With the door 6 covering the opening 56, the front surface 2 of the pressure vessel packing 1 contacts the door 6, whereby the opening 56 can be made airtight.

  As shown in FIG. 3, the pressure vessel packing 1 is inserted into the groove 51 with the legs 8a and 8b bent. In this state, the legs 8 a and 8 b act with an elastic restoring force toward the inner surface 52, and the tapered surface 31 of the pressure vessel packing 1 is always in contact with the inner surface 52 of the groove 51. . As a result, an airtight groove pressure chamber 7 defined by the rear surface 4 of the pressure vessel packing 1 and the bottom surface 53 and the inner surface 52 of the groove 51 is formed. The in-groove pressure chamber 7 communicates with a gas supply / discharge passage 54 provided in the container body 5, and a gas supply means (not shown) and a decompression means (not shown) are connected to one end of the gas supply / discharge path 54. ing. When gas is supplied through the gas supply / discharge passage 54 by the gas supply means, the pressure chamber 7 in the groove is pressurized, and the pressure vessel packing 1 advances toward the door 6, and the front surface 2 contacts the door 6 as shown by the solid line. Stop in contact. Further, when the gas is discharged through the gas supply / discharge passage 54 by the pressure reducing means, the pressure chamber 7 in the groove is depressurized, the pressure vessel packing 1 moves backward toward the bottom surface 53 of the concave groove 51, and the rear surface 4 is shown as indicated by a broken line. Stops in contact with the bottom surface 53. In this manner, the pressure vessel packing 1 can be moved back and forth in the concave groove 51, and the door 6 and the front surface 2 of the pressure vessel packing 1 are configured to be contactable and separable.

  Here, the relationship between the dimension of the pressure vessel packing 1 and the dimension of the concave groove 51 will be described with reference to FIGS. 1 and 3. The width W 1 of the straight surface 32 of the pressure vessel packing 1 is smaller than the width Wg of the concave groove 51, and the width W 2 at the rear end of the tapered surface 31 is larger than the width Wg of the concave groove 51. Accordingly, the legs 8 a and 8 b are bent and inserted into the concave groove 51 so as to reduce the width W 2 at the rear end of the tapered surface 31 of the pressure vessel packing 1, and then restored within the concave groove 51. Of these, only the vicinity of the rear end is brought into linear contact with the inner surface 52 of the groove 51, and the straight surface 32 is not brought into contact with the inner surface 52. As a result, the sliding resistance when the pressure vessel packing 1 advances and retreats can be reduced.

  When the advancement and retreat of the pressure vessel packing 1 in the concave groove 51 are repeated, the portion that comes into contact with the inner surface 52 is worn. In the present embodiment, since the taper angle b of the taper surface 31 is set larger than the slit angle a of the V-groove 41, even if the taper surface 31 is worn, it contacts the inner surface 52 of the groove 51. Is retained. Further, since the taper angle b of the taper surface 31 is set larger than the slit angle a of the V-groove 41, the legs 8a and 8b are pressed toward the inner side surface 52 when the pressure chamber 7 in the groove is pressurized. Since it acts in the direction, reliable contact can be achieved, and airtightness can be ensured even if the tapered surface 31 is worn. Furthermore, the rear end portion of the leg 8 is formed thick, so that the deformation of the pressure vessel packing 1 does not increase even when the leg 8 is pulled in, and gas leaks from between the pressure vessel packing 1 and the concave groove 51. Since the pressure chamber 7 in the groove can be kept airtight without being generated, the pressure vessel packing 1 can be sufficiently pulled in and the pressure vessel can be kept airtight.

  In a cross-sectional view perpendicular to the longitudinal direction, toward a straight line connecting a first intersection P1 that is an intersection between the front surface 2 and one side surface 3a and a second intersection P2 that is an intersection between the rear surface 4 and one side surface 3a. The length L of the perpendicular extending from the third intersection P3 that is the intersection of the straight surface 32 and the tapered surface 31 on the other side surface 3b is set to be longer than the width Wg of the concave groove 51. When the dimensions are set in this way, even when the pressure vessel packing 1 is inserted in the concave groove 51 and rotated counterclockwise in the drawing, the first intersection point is formed before the leg 8a and the inner surface 52 are separated from each other. There is no possibility that P1 contacts the inner side surface 52 (see FIG. 4). That is, since the pressure vessel packing 1 does not rotate around the first intersection P1 in the concave groove 51 due to frictional force, the pressure vessel packing 1 is fixed in the concave groove 51 in the course of advancement or retraction. There is no possibility of causing poor pull-in. FIG. 4 illustrates a limit case in which the width Wg of the concave groove 51 and the length L of the perpendicular are equal.

  The front surface 2 of the pressure vessel packing 1 has a curvature radius R in a cross-sectional view perpendicular to the longitudinal direction, and the curvature radius R is set to be larger than half the width Wg of the concave groove 51. Thereby, even if the front surface 2 abuts on the door 6, it abuts linearly, so that the airtightness of the pressure vessel can be improved. Further, since the front surface 2 and the door 6 are in linear contact with each other, when the pressure vessel packing 1 is retracted, the front surface 2 can be smoothly separated without sticking to the door 6, and there is a possibility that a pull-in failure may occur. Absent.

  In the pressure vessel packing 1, the distance H between the front surface 2 and the rear surface 4 is set to be shorter than the depth Dg of the concave groove 51. For this reason, in the fully retracted state, the pressure vessel packing 1 is not exposed from the concave groove 51, and there is no possibility that the pressure vessel packing 1 is caught in the door 6 when the door 6 is slid to open and close. There is no risk of detachment from the groove 51.

  In the present embodiment, the pressure vessel packing 1 is fitted and inserted into a concave groove 51 provided in the container main body 5 so as to be able to come into contact with and separate from the door 6. It is also possible to provide a groove and insert the pressure vessel packing 1 so that the vessel main body 5 can be contacted and separated.

DESCRIPTION OF SYMBOLS 1 Packing for pressure vessels 2 Front surface 3a Side surface 3b Side surface 31 Tapered surface 32 Straight surface 4 Rear surface 41 V groove 5 Container body 51 Concave groove 52 Inner surface 53 Bottom surface 54 Gas supply / exhaust passage 6 Door

Claims (4)

A packing provided in a pressure vessel comprising a container body having an opening and a door for closing the opening,
An in-groove pressure chamber that is fitted into an annular groove provided in one of the container main body and the door so as to surround the opening and is hermetically formed between a bottom surface and an inner surface of the groove. Depending on the pressure applied to the bottom surface, it is possible to advance in a direction away from the bottom surface and to retreat in a direction close to the bottom surface, and abuts against the other of the door and the pressure vessel when it is most advanced. The pressure vessel is configured to be airtight,
A front surface in contact with the other,
Two side surfaces extending rearward from both sides of the front surface and spaced apart from each other in the width direction;
A rear surface facing the front surface,
The side surface is provided with a taper surface extending in the longitudinal direction, widened at a predetermined taper angle toward the rear and connected to the rear surface.
The rear surface is provided with a V-groove that opens rearward at a predetermined slit angle and extends in the longitudinal direction.
The pressure vessel packing, wherein the taper angle is larger than the slit angle when the groove is not inserted into the concave groove. A straight surface that connects the front surface and the tapered surface and is formed in parallel with the inner surface of the groove is provided on the side surface,
In a state where the groove is not inserted into the groove, the width of the straight surface is smaller than the width of the groove, and the width at the rear end of the tapered surface is larger than the width of the groove.
Furthermore, in a cross-sectional view perpendicular to the longitudinal direction when not inserted into the concave groove, a first intersection that is an intersection of the front surface and one of the side surfaces, and the rear surface and the one of the side surfaces The length of the perpendicular extending from the third intersection that is the intersection of the straight surface and the taper surface on the other side surface is longer than the width of the concave groove toward the straight line connecting the second intersection that is the intersection. The packing for a pressure vessel according to claim 1. The front surface has a predetermined radius of curvature in a cross-sectional view perpendicular to the longitudinal direction;
The packing for a pressure vessel according to claim 2, wherein the radius of curvature is larger than half of the width of the groove when not inserted into the groove. The pressure vessel packing according to any one of claims 1 to 3, wherein a distance between the front surface and the rear surface is shorter than a depth of the concave groove.

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