JP6362381B2 - Pipe closing member - Google Patents

Description

  The present invention relates to a pipe closing member that closes a pipe through which a fluid such as gas flows by expanding a heat blocking material with heat at the time of occurrence of a fire and prevents fluid leakage from the pipe.

As a conventional pipe closing member for preventing fluid leakage at the time of occurrence of a fire, for example, one having a configuration shown in Patent Document 1 is known.
The pipe closing member described in Patent Document 1 includes a cylindrical heat closing material mainly composed of rubber and expanded graphite, and a holding member that is deformed by the expansion force of the heat closing material. The said pipe | tube obstruction | occlusion member is comprised so that the thermal obstruction | occlusion material thermally expanded by the occurrence of a fire may obstruct | occlude a pipe line, and also will remain in a pipe line even if it receives gas pressure by the effect | action of a holding member.

Japanese Patent No. 4474637

In the pipe closing member described in Patent Document 1, the heat blocking material expands from the inner peripheral wall side of the pipe line toward the axial center side to block the pipe line. However, the filling rate of the axial center region of the pipe line due to the expansion of the heat blocking material is not always sufficient, and there is room for improvement in terms of blocking more reliably.
An object of the present invention is to provide a pipe closing member that has a high filling rate in the axial center region of a pipe line due to expansion of a heat plugging material and can block the pipe reliably.

A first characteristic configuration relating to a pipe closing member according to the present invention is a pipe closing member provided with a heat blocking member that thermally expands and closes the pipe when the gas pipe is heated, and the thermal blocking member includes: , An annular outer peripheral expansion part that can be mounted on the pipe line over the entire inner wall of the pipe line, a central expansion part disposed at the center of the annular outer peripheral expansion part, and a support that supports the central expansion part And the central expansion portion is formed to be thicker in the radial direction than the support portion .

[Action and effect]
As in this configuration, an annular outer peripheral expansion portion that can be attached to the pipe so that the heat blocking material extends over the entire inner wall of the pipe, and a central expansion portion that is disposed at the center of the annular outer expansion portion. In addition to the conventional expansion from the inner peripheral wall side of the pipe line toward the axial center side, expansion in the reverse direction from the axial center side to the pipe inner wall side also occurs. Therefore, in the event of a fire, not only can the filling rate of the axial center region of the pipe line be increased and the pipe line can be reliably closed, but also the time required for the blockage is reduced, so that the pipe line can be closed more quickly. It becomes possible.
Moreover, according to this structure, since the center expansion | swelling part is formed in thickness at radial direction, the filling rate of the axial center area | region of a pipe line at the time of a fire outbreak is raised further .

  The second characteristic configuration is that the central expansion portion and the support portion are configured by a bridging portion that bridges the inside so as to pass through the central portion of the annular outer peripheral expansion portion.

[Action and effect]
By configuring the central expansion portion and the support portion as a bridge portion as in this configuration, the central expansion portion is more reliably disposed at the position of the central portion of the annular outer peripheral expansion portion.

  The third characteristic configuration is that a plurality of the bridging portions are provided.

[Action and effect]
According to this configuration, since a plurality of bridging portions are provided, the central expansion portion is more firmly arranged at the position of the central portion of the annular outer peripheral expansion portion.

  The fourth characteristic configuration includes the two bridging portions that are thermally expandable, and the two bridging portions intersect each other in a cross shape.

[Action and effect]
According to this configuration, since the two bridging portions capable of thermal expansion are provided to cross in a cross shape, the filling rate of the pipeline at the time of the fire is further improved as compared with the case of one bridging portion, The pipeline is more likely to be plugged with faster and uniform packing density.

A fifth characteristic configuration is that the annular outer circumferential expansion portion includes a plurality of slits that form an arc shape along the circumferential direction and penetrate in the thickness direction .

A sixth characteristic configuration is that the support portion is made of metal .

A seventh characteristic configuration is that a porous member that covers the entire side surface is provided on each of both side surfaces of the heat blocking material in the axial direction of the annular outer peripheral expansion portion.

[Action and effect]
According to this configuration, by providing the porous member, expansion of the heat blocking material in the axial direction of the pipe line is restricted, and as a result, expansion in the radial direction is promoted, so the pipe line is blocked more efficiently. It becomes possible.

The eighth characteristic configuration is that the porous member has a bottomed cylindrical shape that can be fitted onto each of both side surfaces of the heat blocking material .

It is a disassembled perspective view of the pipe | tube obstruction | occlusion member which concerns on this invention. It is a perspective view of the pipe line closure member concerning the present invention. It is a perspective view which shows the 1st modification of a heat blocking material. It is a perspective view which shows the 2nd modification of a heat blocking material. It is a perspective view which shows the 3rd modification of a heat blocking material. It is a longitudinal cross-sectional view of the Example which applied the pipe-line obstruction | occlusion member which concerns on this invention to No. 50 nozzle | cap | die. It is a longitudinal cross-sectional view of the Example which applied the pipe-line obstruction | occlusion member which concerns on this invention to No. 90 mouthpiece.

Hereinafter, an embodiment of a conduit closing member according to the present invention will be described based on the drawings.
Embodiment
As shown in FIGS. 1 and 2, a pipe closing member 1 according to this embodiment includes a thermal closing material 2 that thermally expands to close the pipe when the gas pipe is heated, and the thermal closing material 2. And a porous member 5 that promotes expansion in the radial direction. In the present embodiment, a bottomed cylindrical porous member 5 that covers the entire side surface is externally fitted to each of both side surfaces in the axial direction of the heat blocking material 2.

(Thermal closure material)
The heat blocking material 2 includes an annular outer peripheral expansion portion 3 that can be attached to the pipe so as to extend over the entire inner wall of the pipe, a central expansion portion 4a disposed at the center of the annular outer peripheral expansion portion 3, and the center. And a support portion 4b that supports the expansion portion 4a.

  In the heat blocking material 2 shown in FIG. 1, two bridging portions 4 that bridge the inner side so as to pass through the center portion of the annular outer peripheral expansion portion 3 are provided so as to intersect with each other. The bridging portion 4 is integrally provided with a central expansion portion 4a and a support portion 4b. In this configuration, the portion where the two bridging portions 4 intersect serves as the central expansion portion 4a. In the heat blocking material 2 of this configuration, the annular outer peripheral expansion portion 3 and the bridging portion 4 (the central expansion portion 4a and the support portion 4b) are integrally formed.

  In the heat blocking material 2 of this configuration, the width H of each of the bridging portion 4 and the annular outer peripheral expansion portion 3 is set to the same size, and the thickness of each of the bridging portion 4 and the annular outer peripheral expansion portion 3 is also the same size. Is set to In addition, the thickness of the bridging portion 4 is a thickness that can reliably block the pipe line in the event of a fire, and the pressure loss of the fluid flowing through the pipe line during the normal time can be minimized. It is desirable to set to.

  The entire heat blocking material 2 of this configuration, that is, the annular outer peripheral expansion portion 3 and the bridging portion 4 (the central expansion portion 4a and the support portion 4b) are composed of a thermal expansion material including a rubber material and a fireproof foam material as main components. Has been. As an applicable rubber material, for example, nitrile rubber (NBR) excellent in oil resistance, water resistance, gas permeation resistance and the like is preferable, but is not limited thereto. Moreover, as an applicable fireproof foaming material, thermal expansion graphite having high thermal expansion performance is suitable, but is not limited thereto. Further, it is desirable that the heat blocking material 2 is thermally expanded at 180 ° C. to 200 ° C.

  In the heat blocking material 2 of this configuration, the annular outer peripheral expansion portion 3 thermally expands from the inner peripheral wall side of the pipe line toward the axial center side, and the central expansion part 4a extends from the axial center side of the pipe line when a fire occurs. Thermal expansion toward the inner peripheral wall. That is, in addition to the conventional expansion from the inner peripheral wall side to the axial center side of the pipe, the expansion in the opposite direction from the axial side to the inner pipe wall also occurs. In addition to being able to reliably close the pipeline, the time required for the closure is shortened, so that the pipeline can be closed more quickly.

  Further, in the heat blocking material 2 of this configuration, the four support portions 4b also thermally expand, so that the filling rate of the pipe line in the event of a fire is further improved, and the pipe line is plugged at a faster and uniform filling density. It is easy to be done.

Next, some modifications of the heat blocking material 2 will be described.
In the first modification shown in FIG. 3, the central expansion portion 4a is formed in a cylindrical shape, and the central expansion portion 4a is supported by four thin wall portions 4b (support portions) arranged in a cross shape in plan view. ing.

  The diameter of the central expansion portion 4a in the first modification is set larger than any thickness of the thin wall portion 4b and the annular outer peripheral expansion portion 3. That is, the central expansion portion 4a is formed thick in the radial direction. Further, the thickness of the thin wall portion 4 b is set to be thinner than the thickness of the annular outer peripheral expansion portion 3.

  According to this structure, since the center expansion part 4a is thick, the filling rate of the axial center area | region of a pipe line at the time of fire outbreak is raised further. Further, since the central expansion portion 4a is made thick while the support portion is constituted by a thin thin wall portion 4b, the pressure loss of the fluid has the same thickness as shown in FIG. It can be kept lower than the form.

  Moreover, in the 2nd modification shown in FIG. 4, the cyclic | annular outer periphery expansion part 3 in the above-mentioned 1st modification is provided with the some slit 3a. The slit 3 a is formed in an arc shape along the circumferential direction and penetrates in the thickness direction of the annular outer circumferential expansion portion 3. By providing the slit 3a, expansion of the heat blocking material 2 in the axial direction is suppressed, and as a result, expansion in the radial direction is promoted, and the pipe line can be blocked more efficiently.

  In addition, a third modification is shown in FIG. In this modified example, only one bridging portion 4 is provided which includes a thick and cylindrical central expansion portion 4a and two support portions 4b made of an elongated plate and made of metal (for example, stainless steel). It is.

  The support portion 4b has a length corresponding to the outer diameter of the annular outer peripheral expansion portion 3, and has a wide fixing portion fixed to the annular outer peripheral expansion portion 3, and an annular outer peripheral expansion portion connected to the fixing portion. 3 and an elongate part extending over the inside. The width of the elongated portion is set smaller than both the thickness of the annular outer peripheral expansion portion 3 and the diameter of the central expansion portion 4a. The center expansion portion 4a is supported by the center portion of the annular outer peripheral expansion portion 3 with its both end surfaces sandwiched between the elongated portions of the two plate-like members 4b.

  In the third modified example, since the support portion 4b is made of a metal having high thermal conductivity, the heat received by the annular outer peripheral expansion portion 3 when a fire occurs is more efficiently transmitted to the central expansion portion 4a. As a result, the expansion of the central expansion portion 4a is further promoted when a fire occurs.

(Porous member)
As shown in FIGS. 1 and 2, the porous member 5 is a metal member having a plurality of through holes, and is disposed on each of both side surfaces in the axial direction of the heat blocking material 2. In this embodiment, a bottomed cylindrical mesh member that can be externally fitted to each side surface in the axial direction of the heat blocking material 2 is used. Note that the porous member 5 is not limited to a mesh member, and for example, a bottomed cylindrical metal member provided with a plurality of holes by punching may be used.

  The size and number of the through holes of the porous member 5 should be set so as to promote the expansion of the expansion member in the radial direction in the event of a fire and to minimize the pressure loss of the fluid flowing through the pipe line at the normal time. Is desirable. In this respect, the number of meshes of the mesh member that is desirably applied is 4 mesh to 10 mesh. Examples of the 4-mesh mesh member include a material SUS304, a wire diameter of 0.8 mm, an opening of 5.6 mm, and an aperture ratio of 76.4%. Examples of the 10-mesh mesh member include a material having a material SUS304, a wire diameter of 0.5 mm, an aperture of 2.0 mm, and an aperture ratio of 64.5%.

  Further, the shape of the porous member 5 is not limited to a bottomed cylindrical shape, and for example, a disk-shaped one can be used as long as it can be installed in a pipeline and can withstand the expansion pressure of the heat blocking material 2. You may do it.

[Other Embodiments]
1. In the above-described embodiment, one or more bridging units 4 are provided, and the configuration is not limited to the above-described embodiment, and three or more bridging units 4 may be provided as necessary.
2. The porous member 5 in the above-described embodiment is not necessarily provided when sufficient blocking property is recognized only by the heat blocking material 2.
3. The heat blocking material 2 in the above-described embodiment does not necessarily include the bridging portion 4. For example, it is good also as a structure which provides the protrusion part or protrusion part extended from the cyclic | annular outer periphery expansion part 3 to the center part.

  Using the heat blocking material 2 according to the first modification of FIG. 3, a plugging evaluation test was performed on the base 6 of the large gas meter. Table 1 below shows the type of the cap 6 used, the size of the heat blocking material 2 in the pipe closing member 1, and the number and shape of the mesh of the porous member 5 (mesh member).

  In Example 1, as shown in FIG. 6, No. 50 cap 6 having a large diameter pipe line 7 and a small diameter pipe line 8 was used. After the pipe closing member 1 configured by combining the heat blocking material 2 and the two bottomed cylindrical mesh members 5 is installed at the innermost part of the large diameter pipe 7 of the No. 50 cap 6, it is further cut off The mouth valve 11 was attached and fixed by bolting. And it heated for 30 minutes within the muffle furnace heated to 500 degreeC.

  In Example 2, as shown in FIG. 7, a No. 90 base 6 in which a circumferential groove 10 is formed in the pipe line 9 is used in order to fit the pipe closing member 1. After the pipe closing member 1 configured by combining the heat blocking material 2 and the two disk-shaped mesh members 5 is installed in the circumferential groove 10 of the No. 90 base 6, a shut-off valve 11 is further attached and bolted. Fixed. And it heated for 30 minutes within the muffle furnace heated to 500 degreeC.

  Moreover, the obstruction | occlusion evaluation test was similarly implemented about the comparative example 1 and the comparative example 2 corresponding to each of the said Example 1 and Example 2. FIG. However, the pipe closing member 1 in the comparative example 1 and the comparative example 2 does not include the porous member 5, and the heat blocking member 2 is composed only of the annular outer peripheral expansion portion having the dimensions shown in Table 2 below. The thin wall portion and the central expansion portion are not provided.

  The results of the occlusive evaluation test are shown in Table 3 below. In addition, about the leakage amount, the amount of leakage was measured by supplying air with a gas supply pressure of 2.5 kPa using a blower to each die after heating, and measuring a pressure drop with a reference device.

  In any of Example 1, Example 2, Comparative Example 1, and Comparative Example 2, the heat blocking material 2 is closely packed in the radial direction, and light leakage from the axial center region of the cap pipe line is recognized. There wasn't. However, the leakage amounts of Example 1 and Example 2 were significantly lower than those of Comparative Example 1 and Comparative Example 2, and a high blocking effect was confirmed.

  The pipe closing member according to the present invention can be applied to a base of a large gas meter, for example.

DESCRIPTION OF SYMBOLS 1 Pipe | line obstruction | occlusion member 2 Thermal obstruction | occlusion material 3 Annular outer periphery expansion part 3a Slit 4 Bridging part 4a Center expansion part 4b Support part 5 Porous member 6 Base 7 Large diameter pipe line 8 Small diameter pipe line 9 Pipe line 10 Circumferential groove 11 Shut-off valve

Claims (8)

A pipe closing member comprising a heat blocking material that thermally expands to close the pipe when the gas pipe is heated,
An annular outer peripheral expansion part that can be attached to the pipe line so that the heat blocking material extends over the entire inner wall of the pipe line, a central expansion part disposed at the center of the annular outer peripheral expansion part, and the central expansion A support part for supporting the part,
A conduit closing member in which the central expansion portion is formed thicker in the radial direction than the support portion .   2. The conduit closing member according to claim 1, wherein the central expansion portion and the support portion are configured by a bridging portion that bridges an inner side so as to pass through a central portion of the annular outer peripheral expansion portion.   The pipe blockage member according to claim 2 provided with two or more said bridge parts.   The pipe closing member according to claim 3, comprising two bridging portions capable of thermal expansion, and the two bridging portions cross each other in a cross shape. The pipe | tube obstruction | occlusion member of any one of Claims 1-4 with which the said cyclic | annular outer periphery expansion | deployment part is provided with two or more slits which form circular arc shape along the circumferential direction and penetrate in the thickness direction . The conduit closing member according to claim 1, wherein the support portion is made of metal . The pipe | tube obstruction | occlusion member of any one of Claims 1-6 provided with the porous member which covers the whole said side surface in each of the both sides | surfaces of the said heat | fever obstruction | occlusion material in the axial center direction of the said annular outer peripheral expansion part. The pipe closing member according to claim 7, wherein the porous member has a bottomed cylindrical shape that can be fitted onto each of both side surfaces of the thermal closing member .

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