JP2014081022A - Manhole gasket - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase a sealing characteristic between a manhole lid and a flange in an easy manner without applying any cost.SOLUTION: A manhole gasket G for assuring a seal characteristic of a manhole 53 is constituted such that an annular core body 1 is covered by a fluororesin outer coat 2 and held between a flange 55 and a lid 54 of the manhole 53, a peripheral edge of the lid 54 and the flange 55 are fastened with a clamp 56. Each of the upper surface and lower surface of the annular core body 1 is formed with peripheral grooves 3 displaced in a diametral direction and a resilient soft annular seal member 4 is fitted to each of the grooves 3. As the clamp 56 performs a fastening operation, the lower annular seal member 4 is pushed against the flange 55 through the outer coat 2 and the upper annular seal member 4 is pushed against the lid 54 through the outer coat 2, respectively.

Description

  The present invention relates to a gasket used for sealing a manhole such as a container installed in a chemical factory.

  In the field of the pharmaceutical and chemical industries where high corrosion resistance and high product purity are required, as shown in FIG. 3, a container 51 whose inner surface is covered with a glass layer 52 is used as a container 51 for performing various treatments. . The glass layer 52 is formed by a glass lining process in which glass is glazed on the surface of a metal that is a base material and then fired.

  In such a container 51, a manhole 53 is provided in an upper portion thereof for supplying a substance to be treated and cleaning the inside, and the manhole 53 includes a lid 54 that can be opened and closed.

  As shown in FIGS. 4 and 5, the lid 54 is rotatably connected to the container 51 via a hinge portion 54 a and is supported by the flange 55 of the manhole 53 in the closed state. The lid 54 is provided with a viewing window 54b and a handle 54c. A gasket G is sandwiched between the lid 54 and the flange 55, and the peripheral portion of the lid 54 and the flange 55 are fastened by a plurality of clamps 56, thereby ensuring the sealing performance of the manhole 53.

  By the way, the glass lining process is also applied to the front surface of the flange 55 and the back surface of the lid 54 with which the substance to be treated may come into contact, but it is difficult to form the glass layer 52 with a uniform thickness. The surface of the glass layer 52 is in a undulating state.

  In order to ensure sealability even in such a state, adjustment work is generally performed to fill the gap between the flange and the gasket by applying gasket paste to a thin part of the glass layer or sandwiching a fibrous film. However, this adjustment work is very time-consuming.

  In order to reduce the load of this adjustment work, in Patent Document 1 below, a flat annular core body formed from rubber or fiber is wrapped with a fluororesin outer skin, and the upper and lower surfaces of the outer skin are made of a fluororesin porous material. There has been proposed a gasket in which a body sheet is attached by spot welding or the like so that the fluororesin porous body sheet is in close contact with the glass layer of the flange.

  In addition, in Patent Document 2 below, an annular interposed body interposed between a gasket and a lid is fixed to the flange side using a fixture and a holding ring, and an O-ring is fitted into a groove formed in the interposed body. A manhole structure has been proposed in which an O-ring is brought into close contact with the back surface of the lid as the clamp is tightened.

JP 2003-106456 A JP 2006-206107 A

  However, in the gasket described in Patent Document 1, there is a problem that it takes time and cost to mold the fluororesin porous body sheet and to weld the outer envelope enclosing the annular core and the fluororesin porous body sheet. is there.

  In addition, the manhole structure described in Patent Document 2 has a problem that it takes time and cost to manufacture an interposition body, its attachment, and a press ring, and to fix the interposition apparatus to the flange.

  Accordingly, an object of the present invention is to easily improve the sealing performance between the manhole cover and the flange without incurring costs.

  In order to solve the above problems, the present invention wraps the annular core body with a fluororesin outer skin, sandwiches it between the flange of the manhole and the lid, and tightens the peripheral edge of the lid and the flange with a clamp, In the manhole gasket for securing the manhole sealing property, a circumferential groove portion is formed on each of the upper and lower surfaces of the annular core member in the radial direction, and a flexible annular seal member having elasticity in each groove portion. As each ring seal member is elastically deformed so as to be crushed in the vertical direction as it is fitted and clamped, the lower ring seal member is closed on the flange side through the outer cover, and the upper ring seal member is covered through the outer cover. It was designed to be pressed against each side.

  When the gasket according to the present invention is used, the respective annular seal members can be securely adhered to the flange side and the lid side, respectively, and it is not necessary to make the annular core body too thick.

  And even if the glass layer applied on the surface of the flange of the manhole and the back surface of the lid is undulating, it is possible to apply a special material without applying gasket paste or sandwiching the film. It is possible to easily improve the sealing property between the manhole cover and the flange without manufacturing any parts.

The fragmentary perspective view which shows the principal part cross section of the gasket which concerns on this invention Manhole seal partial cross-sectional view showing the state of use Partial cutaway elevation view of a container that uses a gasket Top view of the manhole Partial vertical section of the manhole

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  The gasket G shown in FIG. 1 is used in place of the above-described conventional one in the container manhole shown in FIGS.

  The annular core body 1 of the gasket G is made of a fluororesin such as Teflon (registered trademark) excellent in heat resistance and chemical resistance, and is formed into a relatively flat plate shape and has a slight elasticity. It is wrapped with an outer skin 2 made of a fluororesin sheet.

  And the groove part 3 of the circumferential direction is formed in the upper surface and the lower surface of the cyclic | annular core body 1, respectively, and the flexible cyclic | annular seal member 4 which has elasticity, such as a rubber O-ring, is formed in each groove part 3, respectively. It is fitted with a gap in the width direction. The annular seal member 4 protrudes from the groove 3 in the vertical direction and is in contact with the back surface of the outer skin 2.

  Here, it is not necessary to completely cover the annular core body 1 with the outer skin 2 up to the outer peripheral end face, and the outer skin 2 is assumed to be formed by bonding two sheets together at the inner peripheral portion as shown in the figure. The upper and lower surfaces and the inner peripheral surface of 1 may be covered with the outer skin 2.

  In addition, the material of the annular core body 1 and the outer skin 2 may be appropriately selected in consideration of mechanical characteristics and chemical characteristics. In producing the annular core body 1, rubber, organic fiber, inorganic fiber, etc. Various materials may be mixed or laminated to form a predetermined shape.

  Further, as the annular seal member 4, various members such as an O-ring having a round cross-sectional shape, a square cross-sectional shape, a U shape, a V shape, and the like can be used.

  In order to seal the manhole 53 using such a gasket G as shown in FIG. 2, first, the gasket G is formed on the upper surface side of the flange 55 having the glass layer 52 on the surface with the lid 54 opened. Put on.

  Next, the lid 54 is closed, the lid 54 is placed on the gasket G, the outer skin 2 on the lower side of the gasket G is in contact with the glass layer 52 on the surface of the flange 55, and the outer skin 2 on the upper side of the gasket G is It is made to contact | connect the glass layer 52 of a back surface peripheral part.

  Then, the clamp 56 sandwiches the peripheral edge of the lid 54 and the flange 55, and a nut 56 b screwed into the bolt 56 a of the clamp 56 is tightened.

  With the clamp 56 being tightened, each annular seal member 4 is elastically deformed so as to be crushed in the vertical direction, while the lower annular seal member 4 is placed on the flange 55 side via the outer skin 2 and the upper annular seal member 4 is Each is pressed against the lid 54 side through the outer skin 2.

  As described above, in the gasket G, the annular seal members 4 can be reliably brought into close contact with the flange 55 side and the lid 54 side, respectively, and it is not necessary to make the annular core body 1 too thick.

  And even if the glass layer 52 applied on the surface of the flange 55 of the manhole 53 and the back surface of the lid 54 is undulating, without applying gasket paste or sandwiching the film, The sealability between the lid 54 and the flange 55 of the manhole 53 can be easily improved without producing special materials and parts.

  In the above embodiment, only one groove portion 3 is provided on each of the upper surface and the lower surface of the annular core body 1 and the annular seal member 4 is fitted in the groove 3, but the upper surface of the annular core body 1 is illustrated. A plurality of groove portions 3 may be provided on the lower surface and the annular seal member 4 may be fitted in these groove portions 3.

G gasket 1 annular core 2 outer skin 3 groove 4 annular seal member 51 container 52 glass layer 53 manhole 54 lid 54a hinge 54b viewing window 54c handle 55 flange 56 clamp 56a bolt 56b nut

Claims (1)

  The annular core (1) is wrapped with a fluororesin outer skin (2) and sandwiched between the flange (55) and the lid (54) of the manhole (53), and the peripheral edge of the lid (54) and the flange ( 55) and a manhole gasket (G) that secures the sealing performance of the manhole (53) by tightening with a clamp (56), the upper and lower surfaces of the annular core body (1) are respectively displaced in the radial direction. The circumferential groove portion (3) is formed, and a flexible annular seal member (4) having elasticity is fitted into each groove portion (3), and each annular seal member (4) is tightened with the clamp (56). The lower annular seal member (4) is placed on the flange (55) side through the outer skin (2) and the upper annular seal member (4) is placed on the outer skin (2). The manhole gasket is characterized by being pressed against the lid (54) side.

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