JP7190928B2 - annular flat packing - Google Patents

Description

The present invention relates to an annular flat packing.

BACKGROUND ART In some cases, an exhaust top for discharging exhaust gas from combustion equipment such as a water heater and a hot water heater to the outside is provided on the outer wall of a building. The exhaust top has a double structure including an outer cylinder member and an inner cylinder member, and is attached so as to protrude outward from the outer wall.
Since the exhaust top is in contact with the outside air, the temperature of the exhaust gas drops and condenses to produce exhaust condensed water. After the exhaust condensed water is temporarily stored inside the outer cylinder member of the exhaust top, it evaporates by natural evaporation. It should be noted that no suitable patent references are found that mention storage and evaporation of exhaust condensate in such an exhaust top.

While the exhaust condensed water is stored in the exhaust top, the exhaust condensed water may leak through the gap between the outer cylinder member and the inner cylinder member. Since the exhaust condensed water is acidic (pH 1.5 to 3), the leaked exhaust condensed water may corrode the outer wall and the like.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide an annular flat packing that can prevent exhaust condensed water from leaking from an exhaust top or the like.

The annular flat packing according to the present invention includes an annular flat plate having an annular rib portion that protrudes in a thickness direction and extends along the circumferential direction, and a plurality of through holes that penetrate in the thickness direction for inserting a fixing member, and the annular flat packing protrudes from the annular rib portion. The length is maximum at a position corresponding to the central portion between the two through holes that are adjacent in the circumferential direction.

According to this configuration, the compressive strain between the circumferentially adjacent through-holes when fixed by the fixing member is improved. Therefore, there is little difference between the compressibility of the portion fixed by the fixing member and the compressibility of the intermediate portion between the circumferentially adjacent through-holes, and the compressibility of the entire packing is substantially uniform, resulting in high airtightness. ensured. Therefore, when the annular flat packing of the present invention is used for an exhaust top, for example, leakage of exhaust condensed water can be prevented.

In the present invention, it is preferable that a ring-shaped ridge projecting in the thickness direction is formed on the periphery of the through hole.

By forming the ring-shaped ridge portion as in this configuration, the airtightness of the peripheral portion of the through hole is enhanced.

In the present invention, it is preferable to have a plurality of annular rib portions each having a different diameter.

Airtightness is further enhanced by providing a plurality of annular rib portions as in this configuration.

In the present invention, it is configured to be attached between the opposing circular end faces for sealing, and the outer edge of the annular flat plate is provided with an outer edge annular rib portion having a longer projecting length than the annular rib portion, and the outer edge Preferably, an annular rib fits over the edge of at least one of said opposing circular end faces.

As in this configuration, the annular flat packing of the present invention has a predetermined shape on at least one of the opposing circular end faces by fitting the outer peripheral annular rib portion onto the edge of at least one of the opposing circular end faces. Since it is firmly fixed in place, the tightness is maintained more reliably.

In the present invention, it is preferable that the annular rib portion and the outer edge annular rib portion are provided on both surfaces of the annular flat plate.

As in this configuration, the annular rib portion and the outer edge annular rib portion are provided on both sides of the annular flat plate, so that the airtightness is further enhanced compared to the configuration provided only on one side.

In the present invention, it is preferable to use a material having heat resistance and acid resistance.

According to this configuration, since it is made of a material having heat resistance and acid resistance, durability is improved and it can be used for a longer period of time.

In the present invention, it is suitable when used in the exhaust top.

According to this configuration, leakage of exhaust condensed water from the exhaust top can be prevented.

It is a top view of an annular flat packing. FIG. 2 is a vertical cross-sectional view taken along line II-II of FIG. 1; FIG. 2 is a vertical cross-sectional view taken along line III-III of FIG. 1; FIG. 2 is a vertical cross-sectional view taken along line IV-IV of FIG. 1; It is a partially enlarged plan view of an annular flat packing. It is a partial longitudinal side view of an annular flat packing. FIG. 3 is a vertical cross-sectional side view enlarging the exhaust top and a part thereof; FIG. 3 is an exploded perspective view of the exhaust top; FIG. 4 is a front view of the outer cylinder member of the exhaust top when viewed from the back side; FIG. 4 is a diagram showing measurement points (a) to (l) of compressibility in an annular flat packing. It is a figure which shows the relationship between a tightening torque and a compressibility regarding the annular flat packing of a comparative example. It is a graph which shows the relationship between a tightening torque and a compressibility regarding the annular flat packing of a comparative example. It is a figure which shows the relationship between a tightening torque and a compressibility regarding the annular flat packing of an Example. It is a graph which shows the relationship between a tightening torque and a compressibility regarding the annular flat packing of an Example.

[Embodiment]
An embodiment of an annular flat packing according to the present invention will be described with reference to the drawings.
(Annular flat packing)
As shown in FIGS. 1 to 5, the annular flat packing 1 includes a first annular rib portion 10, a second annular rib portion 11, an outer edge annular rib portion 12, and a plurality of through holes A1, which are formed into a substantially perfect circular annular shape. A flat plate 14 is provided.

The first annular rib portion 10, the second annular rib portion 11, and the outer edge annular rib portion 12 all protrude in the thickness direction of the annular flat plate 14 and extend along the circumferential direction. The first annular rib portion 10, the second annular rib portion 11, and the outer edge annular rib portion 12 have different diameter sizes (the diameter of the first annular rib portion 10<the diameter of the second annular rib portion 11<the outer edge annular rib portion 10). diameter of the rib portion 12) are arranged on the annular flat plate 14 in this order from the inner side.

The second annular rib portion 11 is provided at a substantially central position between the first annular rib portion 10 and the outer edge annular rib portion 12 in the radial direction of the annular flat plate 14 .

In this embodiment, the first annular rib portion 10, the second annular rib portion 11, and the outer edge annular rib portion 12 are provided on both sides of the annular flat plate 14, but the configuration is not limited to this, and the annular A configuration in which it is provided only on one side surface of the flat plate 14 may be adopted.

As shown in FIGS. 1, 4, and 5, the through hole A1 penetrates through the annular flat plate 14 in the thickness direction, and is configured so that the fixing member 2 such as a screw member can be inserted therethrough. In this embodiment, a total of six through holes A1 are provided at intervals of 60° in the circumferential direction. A ring-shaped protrusion 13 that protrudes in the thickness direction is formed on the periphery of the through hole A1. The number of through-holes A1 is not limited to that of the present embodiment, and may be arbitrarily changed as necessary in consideration of sealing performance.

As shown in FIG. 6, the protruding length of the first annular rib portion 10 is maximized at a position corresponding to the central portion between two circumferentially adjacent through holes. The first annular rib portion 10 in this embodiment has a mountain shape along the circumferential direction between two adjacent through holes.

Although not shown, the projection length of the second annular rib portion 11, like the first annular rib portion 10, is maximum at a position corresponding to the central portion between two circumferentially adjacent through holes. , and has a mountain shape along the circumferential direction between two adjacent through-holes.

For example, when the thickness of the annular flat plate 14 is 2 mm, the maximum projection length of each of the first annular rib portion 10 and the second annular rib portion 11 is 0.7 mm, and the minimum projection length (the ring-shaped ridge of the through hole 13) should be 0.5 mm.

As shown in FIGS. 2 to 4, the outer edge annular rib portion 12 is provided on the outer edge portion of the annular flat plate 14, and has a projection length larger than that of the first annular rib portion 10 and the second annular rib portion 11. ing. The protruding length of the outer edge annular rib portion 12 in this embodiment is constant over the entire circumference. For example, when the thickness of the annular flat plate 14 is 2 mm, the protruding length of the outer edge annular rib portion 12 is preferably 1 mm.

The annular flat packing 1 according to this embodiment can be manufactured, for example, by using a rubber material or a resin material and by a known mold molding method or injection molding method. As the material to be used, it is desirable to use a material having heat resistance and acid resistance. Examples of such materials include ethylene acrylic rubber, fluororubber, ethylene propylene rubber, and the like.

(exhaust top)
An example in which the annular flat packing 1 according to the present invention is applied to an exhaust top 3 for discharging the exhaust gas from combustion equipment such as a water heater and a hot water heater to the outside will be described below.

The exhaust top 3 in this embodiment has a double-cylinder structure including an outer cylinder member 30 and an inner cylinder member 32 having a diameter smaller than that of the outer cylinder member 30, and the space inside thereof is used for discharging exhaust gas. composes the exhaust passage of

As shown in FIGS. 7 and 8, the exhaust top 3 in this embodiment includes an outer cylindrical member 30, a drain receiving plate 31, an inner cylindrical member 32, an annular flat packing 1, and an annular flat press plate 33. and is configured to be attachable so as to protrude outward from the outer wall.

As shown in FIG. 9, the outer cylinder member 30 has slit-like exhaust ports formed by a plurality of lateral louvers 300 . An annular stepped portion 301 is formed on the outer peripheral edge of the outer cylindrical member 30, and a semicircular drain receiving plate 31 is fixed to the lower portion of the stepped portion 301 with an adhesive. The drain receiving plate 31 may be made of the same material as the outer cylinder member 30, and the drain receiving plate 31 forms a space for storing exhaust condensed water in the inner lower part of the outer cylinder member 30. .

The stepped portion 301 of the outer cylindrical member 30 and the drain receiving plate 31 are respectively provided with through holes A2 and A3 at predetermined positions for inserting the fixing members 2 such as screw members. In this embodiment, a total of six through-holes A2 are provided in the stepped portion 301 at intervals of 60° in the circumferential direction, and each through-hole A2 corresponds to the through-hole A1 of the annular flat packing 1 . The three through holes A3 of the drain receiving plate 31 are provided so as to correspond to the through holes A2 of the stepped portion 301 provided at the position where the drain receiving plate 31 is attached.

As shown in FIG. 8, the inner cylindrical member 32 has a circular flange portion 320, and the flange portion 320 is also provided with through holes A4 at a plurality of predetermined positions for inserting the fixing member 2 such as a screw member. ing. In this embodiment, a total of six through-holes A4 are provided at intervals of 60° in the circumferential direction, and each through-hole A4 corresponds to the through-hole A1 of the annular flat packing 1 .

The push plate 33 may be made of the same material as the outer cylinder member 30 and the inner cylinder member 32, and the push plate 33 also has through holes A5 at a plurality of predetermined positions through which the fixing members 2 such as screw members are inserted. is provided in In this embodiment, a total of six through-holes A5 are provided at intervals of 60° in the circumferential direction, and each through-hole A5 corresponds to the through-hole A1 of the annular flat packing 1 .

As shown in the partially enlarged view of FIG. is slightly smaller than the inner diameter of the outer wall 302 rising from the stepped portion 301 of .

When assembling the exhaust top 3, as shown in FIGS. 7 and 8, the annular flat packing 1, the flange portion 320 of the inner cylinder member 32, and the push plate 33 are placed in this order inside the outer wall 302 of the outer cylinder member 30. interpolate to . Then, the fixing member 2 such as a screw member is inserted through the respective through holes A1 to A5 so as to extend from the outer cylinder member 30 side to the push plate 33, and fastened, thereby connecting the outer cylinder member 30 and the annular flat packing. 1. The inner cylindrical member 32 and the pressing plate 33 are integrated.

At this time, the annular flat packing 1 is in close contact between the stepped portion 301 of the outer cylindrical member 30 (an example of the opposing circular end faces) and the flange portion 320 of the inner cylindrical member 32 (an example of the opposing circular end faces). Install and seal. Furthermore, as shown in the partially enlarged view of FIG. 7 , the outer edge annular rib portion 12 of the annular flat packing 1 is configured to fit onto the edge portion of the flange portion 320 of the inner cylindrical member 32 .

[Other embodiments]
(1) In the annular flat packing 1 of the above-described embodiment, a configuration including two annular rib portions is described, but the configuration is not limited to this configuration, as long as at least one annular rib portion is provided. Good luck. Moreover, when a plurality of annular rib portions are provided, the number thereof may be arbitrarily changed as necessary.
(2) In the annular flat packing 1 of the above embodiment, the outer edge annular rib portion 12 may be provided as required.
(3) The drain receiving plate 31 and the pressing plate 33 in the exhaust top 3 of the above embodiment may be provided as required.

(Relationship between tightening torque and compressibility of each part of annular flat packing)
As the annular flat packing according to the present invention, two types (Example and Comparative Example) of ethylene acrylic rubber packing having the following dimensions were used.
<Example>
Outer diameter: 158mm
Inner diameter: 138mm
Ring width: 10mm
Thickness of annular flat plate: 2 mm
Protrusion length of outer edge annular rib: 1 mm
Maximum protrusion length of each of the first annular rib portion and the second annular rib portion: 0.7 mm
Minimum projection length of each of the first annular rib portion and the second annular rib portion (corresponding to the projection length of the ring-shaped ridge portion of the through hole): 0.5 mm
Width of each of the first annular rib portion, the second annular rib portion, and the outer edge annular rib portion: 1 mm
Through holes: Diameter 3.2 mm, 6 locations at 60° intervals in the circumferential direction

<Comparative example>
The protrusion length of each of the first annular rib portion and the second annular rib portion is constant over the entire circumference (protrusion length: 0.5 mm), and between two adjacent through-holes, there is a ridge along the circumferential direction. It has the same configuration as the packing according to the above-described embodiment, except that it does not have a shape.

Each of the packings of the above Examples and Comparative Examples was fixed between the outer cylinder member and the inner cylinder member of the exhaust top with six screws. In this embodiment, the drain receiving plate and push plate were not used in the exhaust top. At locations (a to l) shown in FIG. The compressibility was calculated by measuring the thickness of the packing at points (a) to (l).

As shown in FIGS. 11 and 12, in the packing according to the comparative example, the compressibility of the locations (a, c, e, g, i, k) fixed with screws is lower than that of the intermediate locations (b, d, f, h , j, l), and the compressibility of the entire packing is non-uniform.

On the other hand, as shown in FIGS. 12 and 13, in the packing according to the embodiment, the compressibility of the portions (a, c, e, g, i, k) fixed with screws and the intermediate portions (b, d, f , h, j, and l), and the compressibility of the packing as a whole is substantially uniform, confirming that high airtightness can be ensured.

(water tightness test)
Each of the annular flat packings having the same configuration as those of the above Examples and Comparative Examples except for having three through-holes was applied to the exhaust top shown in FIG. 3 and a watertightness test was conducted. A water inlet and a pressure gauge are provided on the exhaust top, and the openings of the outer cylinder member and the inner cylinder member of the exhaust top are closed to prevent water from leaking out.

Water was dripped into the exhaust top from the water inlet, and the pressure until water leakage occurred from the annular flat packing portion of each of the examples and the comparative examples was measured. Moreover, the screw tightening torque of the screw member (fixing member) was set to 0.3 N·m and 0.4 N·m. The results are shown in Table 1 below.

As shown in Table 1, for both screw tightening torques of 0.3 N·m and 0.4 N·m, the annular flat packing of the example had a higher pressure than the annular flat packing of the comparative example. It was confirmed that it has a sealing force. In the comparative example tested with a screw tightening torque of 0.4 N·m, stress was concentrated on the portion where the screw member was attached, causing deformation.

INDUSTRIAL APPLICATION This invention can be suitably utilized in the industrial technical field regarding the packing which prevents a liquid leakage.

1 Annular flat packing 10 First annular rib portion 11 Second annular rib portion 12 Outer edge annular rib portion 13 Ring-shaped rib portion 14 Annular flat plate 2 Fixing member 3 Exhaust top 30 Outer cylinder member 300 Louver 301 Stepped portion 302 Outer wall 31 Drain Receiving plate 32 Inner cylindrical member 320 Flange portion 33 Push plates A1 to A5 Through hole

Claims (5)

The annular flat plate is provided with an annular rib portion that protrudes in the thickness direction and extends along the circumferential direction, and a plurality of through holes that penetrate in the thickness direction for inserting the fixing member,
the protruding length of the annular rib portion is maximized at a position corresponding to the central portion between the two through-holes adjacent in the circumferential direction;
configured to fit and seal between opposing circular end faces,
The outer edge portion of the annular flat plate is provided with an outer edge annular rib portion having a longer protruding length than the annular rib portion, the outer edge annular rib portion being fitted onto at least one edge portion of the opposing circular end faces,
An annular flat packing , wherein the annular rib portion and the outer edge annular rib portion are provided on both surfaces of the annular flat plate . The annular flat plate is provided with an annular rib portion that protrudes in the thickness direction and extends along the circumferential direction, and a plurality of through holes that penetrate in the thickness direction for inserting the fixing member,
the protruding length of the annular rib portion is maximized at a position corresponding to the central portion between the two through-holes adjacent in the circumferential direction;
An annular flat packing, characterized in that it is used in an exhaust top . 3. The annular flat packing according to claim 1, wherein a ring-shaped ridge protruding in the thickness direction is formed on the periphery of the through hole. The annular flat packing according to any one of claims 1 to 3 , comprising a plurality of said annular rib portions each having a different diameter. The annular flat packing according to any one of claims 1 to 4 , characterized in that it is made of a material having heat resistance and acid resistance.

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