JPH11218220A - Seal structure of pressure container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a disorder to make it unable to open and close a mirror lid by the galling at the sliding surface of the claws of a flange and a clamp ring, resulting from the protruding of a seal packing to the end face of a can trunk. SOLUTION: A ring form body 90 which is positioned at the outer peripheral side of a seal packing 70 pressed in to the packing groove 80 of a mirror lid 2, and consists of a band plate, is installed together with the seal packing 70. The packing installing groove 80 is made in a structure in which a rectangular groove 81 forming a projection for slip-off stop instead of a conventional dovetail groove is composed integral together with a groove 83 for lip. Adding to that, a hooked form of slip-off preventive member is formed integral together with a lip, to the seal packing 70.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing structure for a pressure vessel, and more particularly to a seal structure for a pressure vessel, wherein a seal packing and a gasket mounting groove in a sealing portion between the lens lid and the can body are improved so that the can body and the lens lid can be closed when the can body is sealed. The sealing gasket is prevented from protruding into a gap formed between the lens and the lens, thereby enabling quick opening and closing of the lens cover for a long period of time.

[0002]

2. Description of the Related Art A pressure vessel for repeatedly processing or treating a product by storing the product in a can body and applying pressure, heating or negative pressure thereto has a sealing structure for sealing the inside of the can. Is an important component and accounts for a large portion of the cost of manufacturing a pressure vessel. This seal structure is mainly directed to a seal packing (lip packing) to be interposed between an open end of a can body and a lens cover for closing and opening the can body.

An example of this pressure vessel will now be described with reference to the drawings. As shown in FIG. 7, a can body 1 is fixed to a support surface E such as the ground or a floor via a footrest 6. 1 is open at one end and a mirror cover 2 for closing the open end 3
Is pivotally mounted on the pivot portion 4 so as to be openable and closable, and is fastened integrally with the can body 1 by a clamp ring 5. As shown in FIG. 8, the sealing structure between the lens cover 2 and the opening end 3 of the can body 1 includes an end surface of a body flange 10 which is provided on the outer peripheral surface of the opening end 3 in a radial direction and has a predetermined width. A seal packing 7 is interposed between the outer peripheral surface of the mirror cover 2 and a lid flange 20 provided in a ring with a predetermined width in the radial direction, and the seal packing 7 is engraved in an annular shape on an end surface of the lid flange 20. It is fitted in the packing mounting groove 8.

The seal packing 7 is special in its cross-sectional shape, and is engaged with a dovetail groove 8a formed in the packing mounting groove 8 to prevent the mounting part 7a from coming off.
A wide lip portion 7b to which the body flange 10 is pressed is formed in the lip groove portion 8b integrated with the lip portion, and is integrally formed as a whole with vulcanized rubber. The clamp ring 5 is an annular body having a U-shaped cross section, and claws 50, 50 are formed on the inner peripheral edge in the radial direction of the clamp ring 5 at a predetermined pitch so as to face each other.
The claws 50 are the same as the claws 11 and 21 formed on the outer peripheral edges of the body flange 10 and the lid flange 20.

As shown in FIG. 7 (B), when the clamp ring 5 rotates half a pitch P / 2 in the circumferential direction and matches with the claws 11 and 21, the lens cap 2 is attached to the can body 1. Will be concluded. Conversely, when the clamp ring 5 is rotated half a pitch P / 2 back to the original position and the claw 50 is rotated a half pitch P / 2 from the claws 11 and 21, the claws 50 and 50 overlap with the claws 11 and 21. The fastening is released by releasing the fastening, whereby the fastening between the lens cover 2 and the can body 1 is released, and the lens cover 2 can be opened.

[0006] The clamp ring 5 is connected to the lid flange 2.
When the “0” is fastened to the body flange 10, a gap S ₁ is formed between the cover flange 20 and the cover flange 20 as shown in FIG. Therefore, when the inside of the can body 1 is pressurized, as shown in FIG.
The gap S ₁ moves between the body flange 10 and the lid flange 20, and the seal packing 7 is extruded into the gap S _1, and the seals 7 grow out as the number of times increases. This leads to deformation deterioration and shortened service life. Therefore, as shown in FIG. 11, to reduce the gap by crimping a seal packing 7 by interposing a pair of pressing member 16 into the gap S ₁ is formed in the case of FIG.

As shown in FIG. 11, the pressurizing member 16 is composed of a pair of wedge-shaped plates having a predetermined gradient.
And fixed to the clamp ring 5. Accordingly, when the clamp ring 5 having the U-shaped cross section to which the body flange 10 and the lid flange 20 are fastened is rotated at a predetermined angle, the inclined surfaces 17, 17 of the pressing member 16 are brought into sliding contact with each other, as shown in FIG. When they coincide with each other, the lid flange 20 is pressed against the body flange 10, and the sealing function of the seal packing 7 acts to seal the inside of the can body 1. However, the manufacture and installation of this part requires skill and occupies a large part of the cost of manufacturing the can body.

[0008]

However, according to the above-mentioned conventional pressure vessel, the seal packing 7 in the sealing structure is made of a flexible material such as rubber while the pressurizing source or the heating source in the can body 1 is used. Since the steam is frequently used, the seal packing 7 is further softened, and the gap S ₁ is further increased.
The tendency to splinter becomes stronger. This bleeding phenomenon is caused by excessive tightening force generated by the bleeding portion of the seal packing 7 or the sliding surface of the claw portions 11, 21 and 50 being caught by the prolonged sealing by the lens cover 2. In addition to causing sticking, it is difficult to quickly open and close the lens cover 2, and also causes deterioration of the seal packing 7 and shortened service life.

Therefore, conventionally, a lubricant is applied to the sliding surface so as to prevent biting, so that quick opening and closing can be performed. Since it is pushed out from the sliding surface of each claw portion, only short-term effects are obtained. In order to maintain the long-term effect, it is sufficient to frequently supply the lubricant, but adding the supply system causes an increase in cost. However, if the operation is continued without the lubricating material, the sliding surface of each of the claws becomes rough, biting occurs, and the lens cover 2 cannot be opened or closed. Therefore, a seal structure having a packing having a shape that does not cause bleeding even if a gap is generated is desired.

On the other hand, the seal packing 7 is formed to have a similar cross-sectional shape slightly larger than the cross-sectional shape of the packing mounting groove 8, and is pushed into the packing mounting groove 8 by utilizing its elasticity to prevent falling off. Is common. The operation of uniformly pushing the seal packing 7 into the packing mounting groove 8 requires a long time even for an expert. Further, as described above, the dovetail groove portion 8a and the lip groove portion 8b have a triangular cross-sectional shape, and the packing mounting groove 8 is not easily carved. That is, since the head lid 2 is a canned product having a large diameter, it must be cut while rotating using a large machine tool. In addition, since the packing mounting groove 8 to be cut has a small cross-sectional dimension, it has a small size of a thin handle. Since a cutting blade such as a cutting tool must be used, the cutting blade is liable to be worn or broken, and the processing must be performed for a long time. To occupy a part.

Accordingly, the present invention provides a pressure vessel sealing structure capable of solving the above-mentioned problems.

[0012]

According to a first aspect of the present invention, there is provided a seal structure for a pressure vessel lid, wherein a mirror lid is rotatably supported at the open end of the can body, and the mirror lid and the mirror lid are connected to each other. A packing mounting groove is engraved on one of both end surfaces of the can body that abut each other, a seal packing is mounted in the packing mounting groove, the can body is closed with the mirror cover, and the can body is fastened with a clamp ring. In a seal structure of a pressure vessel for hermetically sealing the inside of a body, an annular body formed of a band plate is mounted in the packing mounting groove on the outer peripheral side of the seal packing together with the seal packing.

According to the second aspect, the packing mounting groove has a rectangular groove having a retaining projection,
The seal packing has a key-shaped cross-section retaining portion that is pushed into the packing mounting groove. According to the third aspect, the seal packing has an annular step on the outer peripheral surface to which the annular body is in close contact. According to the fourth aspect, the annular body is an annular shape extending over the entire circumference of the packing mounting groove. According to a fifth aspect, the annular body has an arc shape obtained by dividing the entire circumference of the packing mounting groove into a plurality of parts.

Therefore, even if the seal packing tries to stick out between the lid flange and the body flange, the annular body prevents this, so that the claw of the clamp ring and the claw of the mirror cover and the can body which are in contact with each other. Since no biting occurs on the sliding surface of the lens, a quick opening and closing operation of the lens cover is always possible. In addition, since the packing mounting groove has a key shape with a rectangular cross-section as a basic shape, cutting is easy and the processing cost is reduced, and the mounting work of the seal packing with a similar cross-section is easy and quick. I do.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. In the figure, the same reference numerals are used for the same parts as those in the conventional example. As shown in FIG. 1, a mirror lid 2 pivotally supported by a pivot 4 at an open end 3 of a can body 1 can be opened and closed,
When the body flange 10 of the can body 1 and the cover flange 20 of the mirror cover 2 are fastened with the clamp ring 5, as shown in FIG.
The point that the inside of the can body 1 can be pressurized and sealed by the seal packing 70 of the packing mounting groove 80 engraved in the lid flange 20 being in close contact with the end face 3 of the body flange 10 is different from the conventional example. Absent. However, as shown in FIG.
The cross-section of the seal packing 70 and the seal packing 70 to be pushed into it is different from the conventional one. Moreover, the packing mounting groove 80 annular member 90 made of strip is mounted with the seal packing 70, the annular body 90 closes the gap S _1.

As shown in FIG. 4, the packing mounting groove 80 has a key-shaped cross section based on a rectangle and is different from the conventional packing mounting groove 8 having a key-shaped cross section based on a triangle. I have to. That is, a retaining projection 82 is formed on the inner peripheral side of the rectangular groove 81 that replaces the dovetail groove 8a to form a key shape in cross section, and is integrated with the rectangular groove 81 in the same manner as the conventional lip groove 8b. A lip groove 83 is formed. Therefore, as shown in FIG. 6, comparing the cutting examples of the packing mounting groove 80 (A) according to the present invention and the conventional packing mounting groove 8 (B), even if the groove widths w and w ₁ are the same, <the thickness of the neck of h ₁ Since the cutting bit 30 d> depth h of the groove d _1, and the strength of the cutting tool increases. The cutting edge can be a parallel blade that is not sharp as in the case of the conventional dovetail groove. The cutting amount is significantly large, and the packing mounting groove 80 is more advantageous in machining work.

The seal packing 70 having a cross section similar to that of the packing mounting groove 8 also has a different cross sectional shape from the conventional one. That is, as shown in FIG. 5, a retaining portion 71 having a key-shaped cross section based on a rectangle, which is pushed into the rectangular groove portion 81 of the packing mounting groove 80 and is retained by the retaining projection portion 82, A lip 73 having a sealing surface 72 that fits into the basic lip groove 83 and slides on the end face 3 of the body flange 10 is integrally formed.

Further, on the outer peripheral surface of the seal packing 70, an annular step portion 74 for fitting an annular body 90 made of a band plate is formed on the entire periphery in the circumferential direction, leaving a part of the retaining portion 71 in the axial direction. Have been. The seal packing 70 forms a moving gap 84 (see FIG. 5) between the retaining portion 71 and the retaining projection 83 so that the seal packing 70 can advance and retreat toward the body flange 10 in the packing mounting groove 80. .

The annular body 90 is provided in the seal mounting groove 80 in order to prevent the seal packing 70 from sticking into the gap S ₁ between the body flange 10 and the cover flange 20.
The annular step 74 is for inserting the annular body 90 and moving in the direction of the body flange 10 together with the seal packing. In addition,
This annular body 90 is not limited to a complete annular shape, and may be an arc shape obtained by dividing the annular shape into a plurality of portions.

Therefore, as shown in FIG. 5, the seal packing 70 is pushed into the packing mounting groove 80, the retaining portion 71 is pushed over the retaining projection 82 and is pushed into the rectangular groove 81, and the annular body 90 is formed. Is inserted between the annular step 74 and the packing mounting groove 80 so that the end face thereof and the sealing surface 72 of the seal packing 70 are
Are positioned on substantially the same plane. Therefore, the seal packing 70 cannot be dropped off by the retaining projection 82, and
The annular body 90 is mounted in the packing mounting groove 80 by the elasticity of the seal packing 70.

Therefore, as shown in FIG. 1, the can body 1 is closed with the lens cover 2, and the clamp ring 5 is rotated by a half pitch to fasten the claws 11 and 21, thereby obtaining
When the seal surface 72 of the seal packing 70 comes into contact with the end surface 3 of the body flange 10 to perform sealing and pressure is applied to the inside of the can body 1, as shown in FIG. At the same time, the internal pressure causes the retaining portion 71 to be pushed toward the body flange 10 so that the seal packing 70 and the annular body 90 are integrally pressed against the end face 3 of the body flange 10 to seal the pressure fluid.

[0022] However, if the seal packing 70 was Serve Hami into the gap S _1, the annular member 90 is closed between the gap S _1, a portion of the seal packing 70 is put Hami into the gap S ₁ There is no. Therefore, when the pressure in the can body is released, the pressing of the sliding surfaces 51 of the claws 50 is released and the sliding surfaces 51 do not bite each other, so that the mirror cover 2 can be quickly opened and closed.

[0023]

According to the present invention described above, since the annular body formed of a band plate for preventing the sticking-out phenomenon of the seal packing is mounted together with the seal packing in the packing mounting groove, the seal packing is formed by the annular body with the lid flange. There is no sticking out of the gap with the body flange, so the sliding surfaces of the clamp ring and the lid and the claws of the body flange do not bite each other, making it easy to open and close the mirror lid and quick opening and closing is possible Becomes

Further, since the cross-sectional shape of the packing mounting groove is a key-shaped cross-sectional shape based on a rectangle, the cutting process is facilitated, and the influence of the processing cost on the manufacturing cost of the entire pressure vessel can be greatly reduced. . Further, the mounting of the packing is facilitated, and the application of the lubricant to the sliding surface of the claw can be reduced, so that the running cost is reduced. In addition, since the packing does not cause the "decompression deformation", its service life is greatly improved.

[Brief description of the drawings]

FIG. 1 is a front view (A) and a side view (B) of a pressure vessel showing an embodiment of the present invention.

FIG. 2 is an axial sectional view of the part X in FIG. 1;

FIG. 3 is a sectional view of a packing mounting groove.

FIG. 4 is a cross-sectional view of a state in which packing is mounted in a packing mounting groove.

FIG. 5 is an explanatory view of the operation of the packing.

FIG. 6 is a cross-sectional view showing a processing example of the packing mounting groove of the present invention and a conventional packing mounting groove.

FIG. 7 is a front view (A) and a side view (B) of a conventional pressure vessel.

FIG. 8 is an axial sectional view of a part X in FIG.

FIG. 9 is an explanatory diagram of an operation at the time of pressurization in FIG. 8;

FIG. 10 is an axial sectional view of an X part when a pressing member is incorporated.

FIG. 11 is a perspective view (A) of the pressing member when the clamp is closed.
And (B) a perspective view of a state in the middle of full release.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Can body 2 ... Mirror cover 3 ... Open end part 5 ... Clamp ring 10 ... Body flange 20 ... Lid flange 70 ... Seal packing 71 ... Retaining part 72 ... Vertical surface 73 ... Lip part 74 ... Annular step part 80 ... Packing Mounting groove 81: rectangular groove 82: retaining projection 83: lip groove 90: annular body

Claims (5)

[Claims] 1. A lens cover is pivotally supported at an open end of a can body so as to be openable and closable, and a packing mounting groove is formed on one of both end surfaces of the mirror cover and the can body that abut each other. In a pressure vessel seal structure in which a seal packing is mounted in a mounting groove and the can body is closed with the head cover and fastened with a clamp ring, the inside of the can body is sealed, an outer peripheral side of the seal packing is provided in the packing mounting groove. Wherein the annular structure formed of a band plate is mounted together with the seal packing. 2. The seal mounting groove has a rectangular groove having a retaining projection, and the seal packing has a key-shaped cross-section retaining part which is pushed into the packing mounting groove. The seal structure of the pressure vessel described in the above. 3. The pressure vessel sealing structure according to claim 1, wherein the seal packing has an annular step on the outer peripheral surface to which the annular body is in close contact. 4. The pressure vessel sealing structure according to claim 1, wherein the annular body is an annular shape extending over the entire circumference of the packing mounting groove. 5. The pressure vessel sealing structure according to claim 1, wherein the annular body has an arc shape obtained by dividing the entire circumference of the packing mounting groove into a plurality of parts.