Odor-proof valve mechanism and lid equipped with same

Abstract

To provide a deodorization valve mechanism having high versatility allowing attachment to a parent lid of various sizes, to the lid having the parent lid and a child lid.SOLUTION: A deodorization valve mechanism 50 is removably provided to a parent lid 21 in a lid 20 having the parent lid 21 and a child lid 22. The parent lid 21 has a parent lid body 31 formed with a vertically penetrated engagement hole 33 and a step part 32a projected inward in the radial direction from a peripheral surface of the engagement hole 33. The child lid 22 is engaged with the engagement hole 33. The deodorization valve mechanism 50 has a vertically extended cylindrical part 51, a flange 52 and a deodorization valve 54. The flange 52 projects outward in the radial direction from an outer peripheral surface of the cylindrical part 51. and placed on the step part 32a of the parent lid 21. The deodorization valve 54 is provided to the cylindrical part 51 to allow opening / closing of an opening at a lower side of the cylindrical part 51.SELECTED DRAWING: Figure 10

Description

[Technical field]

[0001] The present invention relates to an anti-odor valve mechanism and a lid equipped with the same. More specifically, the present invention relates to an anti-odor valve mechanism attached to a parent and child lid, and a lid equipped with the anti-odor valve mechanism, a parent lid, and a child lid. [Background technology]

[0002] For example, Patent Document 1 discloses a lid equipped with an anti-odor valve mechanism. This lid is a parent-child lid that includes a parent lid and a child lid. The parent lid has a parent lid main body with a fitting hole that penetrates vertically, and a parent lid tubular part that extends downward from the parent lid main body. The child lid fits into the fitting hole formed in the parent lid main body.

[0003] The odor prevention valve mechanism provided in this lid is attached to the parent lid. The odor prevention valve mechanism includes a connecting tubular portion extending vertically that can be fitted into the parent lid tubular portion of the parent lid, and an odor prevention valve that can open and close the lower opening of the connecting tubular portion. When attaching the odor prevention valve mechanism to the parent lid, the connecting tubular portion is fitted into the parent lid tubular portion so that the connecting tubular portion extends downward from the parent lid tubular portion. This allows the odor prevention valve mechanism to be attached to the parent lid. Then, for example, the odor prevention valve mechanism can be arranged in the pipe by fitting the parent lid into a lid frame provided in a pipe through which sewage flows. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2020-90833 A Summary of the Invention [Problem to be solved by the invention]

[0005] Incidentally, the parent lid of the parent-child lid to which the anti-odor valve mechanism disclosed in Patent Document 1 is attached is available in various sizes (in other words, various outer diameters). The diameter of the parent lid tubular part of the parent lid into which the connecting tubular part of the anti-odor valve mechanism is fitted changes depending on the size of the parent lid. Therefore, the diameter of the connecting tubular part of the anti-odor valve mechanism changes depending on the diameter of the parent lid tubular part. That is, in the anti-odor valve mechanism disclosed in Patent Document 1, it was necessary to prepare an anti-odor valve mechanism equipped with a connecting tubular part with a diameter size according to the size of the parent lid. It is preferable that the anti-odor valve mechanism is highly versatile for parent lids of various sizes, and by using an anti-odor valve mechanism with high versatility, the manufacturing cost can be reduced.

[0006] The present invention has been made in consideration of these points, and its object is to provide a highly versatile odor-proof valve mechanism that can be attached to parent lids of various sizes for a lid that has a parent lid and a child lid, and a lid that is equipped with the same. [Means for solving the problem]

[0007] The inventors of the present application have conducted various studies on the configuration of an anti-odor valve mechanism that can be attached to parent lids of various sizes. As a result of various studies, they have focused on the fact that the outer diameter of the child lid that fits into the parent lid does not change for parent lids of various sizes. In other words, they have focused on the fact that the size of the fitting hole into which the child lid fits does not change even for parent lids of various sizes. They have then found that by attaching an anti-odor valve mechanism to the fitting hole of the parent lid, it is possible to provide a highly versatile anti-odor valve mechanism that can be attached to parent lids of various sizes.

[0008] That is, the odor prevention valve mechanism of the present invention is an odor prevention valve mechanism removably provided on a lid comprising a parent lid main body having a fitting hole penetrating vertically, a parent lid having a stepped portion protruding radially inward from the circumferential surface of the fitting hole, and a child lid that fits into the fitting hole. The odor prevention valve mechanism comprises a tubular portion extending vertically, a flange that protrudes radially outward from the outer circumferential surface of the tubular portion and is placed on the stepped portion of the parent lid, and an odor prevention valve provided on the tubular portion to open and close the lower opening of the tubular portion.

[0009] According to the anti-odor valve mechanism of the present invention, when attaching the anti-odor valve mechanism to the parent cover of the lid, for example, with the parent cover placed on the cover frame, the flange of the anti-odor valve mechanism is placed on a step provided on the periphery of the fitting hole of the parent cover. This places the step of the parent cover in a state in which it supports the flange, and the anti-odor valve mechanism can be attached to the parent cover. Therefore, by configuring the anti-odor valve mechanism to be attached to a step provided on the periphery of the fitting hole, whose size does not change even if the outer diameter of the parent cover changes, it is possible to provide a highly versatile anti-odor valve mechanism that can be attached to parent covers of various sizes.

[0010] According to a preferred embodiment of the present invention, the odor control valve mechanism includes an annular seal member provided on the upper or lower surface of the flange.

[0011] According to the above aspect, when the odor prevention valve mechanism is attached to the parent lid, the sealing member can improve the sealing between the flange of the odor prevention valve mechanism and the fitting hole of the parent lid, thereby making it difficult for odors emanating from, for example, sewage present below the lid to leak between the flange and the periphery of the fitting hole.

[0012] According to another preferred embodiment of the present invention, an outer diameter of the seal member is smaller than an outer diameter of the flange, and an outer circumferential step portion is provided between a radial outside of the seal member and a radial outside of the flange.

[0013] According to the above aspect, the outer peripheral step of the anti-odor valve mechanism is placed on the step of the peripheral surface of the fitting hole in the parent lid. At this time, the radially outer end of the seal member contacts the peripheral surface of the fitting hole. Therefore, the step of the parent lid supports the outer peripheral step of the anti-odor valve mechanism, while improving the seal between the flange of the anti-odor valve mechanism and the peripheral surface of the fitting hole in the parent lid.

[0014] According to another preferred aspect of the present invention, the parent lid has a recess that is recessed radially outward from a portion of a circumferential surface of the fitting hole and downward from an upper surface of the parent lid body. The sealing member is provided with a protrusion that fits into the recess.

[0015] For example, odors emanating from sewage present below the lid may leak from the recess in the parent lid. However, according to the above embodiment, when the flange of the anti-odor valve mechanism is placed on the step in the parent lid, the protrusion on the sealing member enters the recess in the parent lid. Thus, the recess is blocked by the protrusion. Therefore, even when the anti-odor valve mechanism is attached to the parent lid, it is possible to prevent odors from leaking from the recess in the parent lid.

[0016] The lid according to the present invention comprises any one of the odor prevention valve mechanisms described above, a parent lid, and a child lid. The parent lid has a parent lid body having a fitting hole penetrating vertically, and a stepped portion protruding radially inward from the periphery of the fitting hole. The child lid fits into the fitting hole.

[0017] According to the above aspect, by fitting the child lid into the fitting hole of the parent lid, it is possible to prevent odors, for example those emitted from sewage present below the lid, from leaking from the fitting hole. When the child lid is removed from the fitting hole, the flange of the odor prevention valve mechanism is placed on the step portion of the parent lid, and the odor prevention valve mechanism is attached to the parent lid. In this way, even when the child lid is removed from the parent lid, the odor prevention valve mechanism can be attached to prevent odors from leaking. Effect of the Invention

[0018] According to the present invention, it is possible to provide a highly versatile odor proof valve mechanism that can be attached to parent lids of various sizes for a lid having a parent lid and a child lid, and a lid equipped with the same. [Brief description of the drawings]

[0019] [Figure 1] FIG. 2 is a perspective view showing an anti-odor valve mechanism according to an embodiment. [Diagram 2]FIG. 13 is a cross-sectional view of a storage tank showing an example of use of the lid according to the embodiment. [Diagram 3] FIG. 4 is a plan view of the lid according to the embodiment. [Figure 4] FIG. 13 is a plan view showing the lid from which the child lid has been removed. [Diagram 5] 4 is a cross-sectional view of the lid taken along the line VV in FIG. 3, showing the state in which the lid is attached to the inspection hatch. FIG. [Figure 6] 6 is a cross-sectional view of the cover taken along line VI-VI in FIG. 3, showing the cover attached to the inspection hatch. [Figure 7] 6 is a cross-sectional view of the lid from which the secondary lid has been removed, and corresponds to FIG. 5. [Figure 8] FIG. 2 is a cross-sectional view of an anti-odor valve mechanism according to an embodiment. [Figure 9] FIG. 7 is a diagram showing the state in which the odor prevention valve mechanism according to the embodiment is attached to the parent lid, and corresponds to FIG. 5. [Figure 10] FIG. 7 is a view showing the state in which the odor prevention valve mechanism according to the embodiment is attached to the parent lid, and corresponds to FIG. 6. [Figure 11] FIG. 10 is an enlarged view of range A in FIG. [Figure 12] 4 is a bottom view of the tubular portion of the anti-odor valve mechanism according to the embodiment. FIG. [Figure 13] 3 is a plan view of a valve body of the anti-odor valve in the anti-odor valve mechanism according to the embodiment. FIG. [Figure 14] 10 and shows a state in which the valve body is open. FIG. [Figure 15] FIG. 1 is a diagram showing an example of a temporary toilet. [Figure 16] 10 is a view showing a state in which an anti-odor valve mechanism according to another embodiment is attached to a parent lid, and corresponds to FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Of course, the embodiment described here is not intended to limit the present invention in particular. In the following drawings, the same reference numerals are used for members and parts that perform the same functions, and duplicated descriptions are omitted or simplified as appropriate.

[0021] Fig. 1 is a perspective view showing an anti-odor valve mechanism 50 according to this embodiment. Fig. 2 is a cross-sectional view of a storage tank 10, showing an example of use of the lid 20. In this embodiment, the anti-odor valve mechanism 50 shown in Fig. 1 is provided on the lid 20 shown in Fig. 2. As shown in Fig. 2, the lid 20 is attached to an inspection hatch 11 used, for example, when inspecting the inside of the storage tank 10.

[0022] In this embodiment, the storage tank 10 is a tank for temporarily storing wastewater containing feces discharged from the temporary toilet 4 during a disaster such as an earthquake. The storage tank 10 is buried underground. The storage tank 10 here is not connected to a so-called main sewer pipe, but may be connected to a main sewer pipe. The storage tank 10 here is a tank dedicated to storing wastewater during a disaster and is not used during normal times other than during a disaster. However, the storage tank 10 may be a tank for storing water such as rainwater or wastewater containing wastewater discharged from drainage facilities such as a toilet, a bathtub, or a kitchen sink during normal times.

[0023] An inspection hatch 11 penetrating vertically and a connection port 13 penetrating vertically are formed on the top surface of storage tank 10. Inspection hatch 11 is for an operator to inspect the condition inside storage tank 10 (e.g., the condition such as the amount of wastewater stored in storage tank 10). Here, the number of inspection hatches 11 is one, but there may be more than one.

[0024] In the event of a disaster, the temporary toilet 4 is connected to the connection port 13. Under normal circumstances, a connection lid (not shown) is fitted into the connection port 13. In the event of a disaster, the connection lid is removed from the connection port 13, and the temporary toilet 4 is connected to the connection port 13. This makes it possible to use the temporary toilet 4, and wastewater discharged from the temporary toilet 4 is temporarily stored in the storage tank 10 through the connection port 13. The number of connection ports 13 is not particularly limited, and is multiple here. In the example of FIG. 2, the number of connection ports 13 is five. The number of connection ports 13 is set appropriately according to the size of the storage tank 10.

[0025] The lid 20 according to this embodiment is attached to the inspection hatch 11 of the storage tank 10. The lid 20 is attached to the inspection hatch 11 so as to be freely opened and closed. FIG. 3 is a plan view of the lid 20 according to this embodiment. FIG. 4 is a plan view showing the lid 20 with the sub-lid 22 removed. FIG. 5 and FIG. 6 are cross-sectional views of the lid 20 taken along the VV section and the VI-VI section of FIG. 3, respectively, showing the state in which the lid 20 is attached to the inspection hatch 11. As shown in FIG. 5, a lid frame 16 is fitted into the inspection hatch 11, and the lid 20 fits into this lid frame 16. The lid 20 according to this embodiment is a so-called parent-child lid or double lid. The lid 20 includes a parent lid 21, a sub-lid 22, and an odor control valve mechanism 50 (see FIG. 1).

[0026] FIG. 7 is a cross-sectional view of the lid 20 with the child lid 22 removed, and corresponds to FIG. 5. As shown in FIG. 7, the parent lid 21 has a parent lid body 31, a first step portion 32a, a second step portion 32b, a third step portion 32c, and a recess 35 (see FIG. 6). The parent lid body 31 is a portion that fits into the lid frame 16 fitted into the inspection hatch 11. The parent lid body 31 is formed with a fitting hole 33 that penetrates vertically. The shape of the fitting hole 33 is not particularly limited, but as shown in FIG. 4, it is, for example, circular. In this embodiment, the fitting hole 33 is formed in the center of the parent lid body 31 in a plan view, but the position where the fitting hole 33 is formed is not particularly limited.

[0027] As shown in Fig. 7, the first step portion 32a to the third step portion 32c are provided on the circumferential surface of the fitting hole 33 of the parent lid main body 31. The first step portion 32a to the third step portion 32c protrude radially inward from the circumferential surface of the fitting hole 33. In the following description, the radial direction refers to, for example, the radial direction of the fitting hole 33 or the radial direction of a tube portion 51 (see Fig. 8) described below. In this embodiment, the first step portion 32a, the second step portion 32b, and the third step portion 32c are arranged in this order from top to bottom.

[0028] In this embodiment, the peripheral surface of the fitting hole 33 has a first vertical surface 41, a second vertical surface 42, a third vertical surface 43, a fourth vertical surface 44, a first horizontal surface 46, a second horizontal surface 47, and a third horizontal surface 48. The first vertical surface 41 constitutes the upper part of the peripheral surface of the fitting hole 33 and extends vertically. Here, the first vertical surface 41 is inclined radially inward as it goes from top to bottom. The first horizontal surface 46 is connected to the lower end of the first vertical surface 41 and extends horizontally from the first vertical surface 41 radially inward. In this embodiment, the first step portion 32a is a portion formed by the first vertical surface 41 and the first horizontal surface 46. Here, the first step portion 32a is an example of a step portion of the present invention.

[0029] The second vertical surface 42 extends downward from the inner end of the first horizontal surface 46. Here, the second vertical surface 42 extends perpendicular to the first horizontal surface 46, but may be inclined radially inward as it extends downward. The second horizontal surface 47 is connected to the lower end of the second vertical surface 42 and extends horizontally radially inward from the second vertical surface 42. In this embodiment, the second step portion 32b is a portion formed by the second vertical surface 42 and the second horizontal surface 47.

[0030] The third vertical surface 43 extends downward from the inner end of the second horizontal surface 47. Here, the third vertical surface 43 extends perpendicular to the second horizontal surface 47, but may be inclined radially inward as it extends downward. The third horizontal surface 48 is connected to the lower end of the third vertical surface 43 and extends horizontally from the third vertical surface 43 radially inward. In this embodiment, the third step portion 32c is a portion formed by the third vertical surface 43 and the third horizontal surface 48. The fourth vertical surface 44 extends downward from the inner end of the third horizontal surface 48.

[0031] The fourth vertical surface 44 extends in a direction perpendicular to the third horizontal surface 48. However, the fourth vertical surface 44 may be inclined radially inward as it extends downward.

[0032] In this embodiment, the first vertical surface 41, the first horizontal surface 46, and the second vertical surface 42 are annular in shape, as shown in Fig. 4. A portion of the second horizontal surface 47, the third vertical surface 43, the third horizontal surface 48, and the fourth vertical surface 44 in the circumferential direction of the fitting hole 33 (here, a portion of the circumferential surface of the fitting hole 33 on the opposite side to the recess 35) is omitted. In other words, the second horizontal surface 47, the third vertical surface 43, the third horizontal surface 48, and the fourth vertical surface 44 are C-shaped.

[0033] 7, in the present embodiment, of the first to third step portions 32a, 32c, the second step portion 32b is disposed radially inward of the first step portion 32a, and the third step portion 32c is disposed radially inward of the second step portion 32b.

[0034] As shown in Fig. 6, the recess 35 is recessed radially outward from the circumferential surface of the fitting hole 33 and downward from the upper surface of the parent lid main body 31. Here, the recess 35 is sized to cover the first vertical surface 41, the first horizontal surface 46, the second vertical surface 42 and the second horizontal surface 47 of the circumferential surface of the fitting hole 33. The bottom surface of the recess 35 is at the same vertical position as the second horizontal surface 47. The shape of the recess 35 is not particularly limited, but here, as shown in Fig. 4, the recess 35 is substantially rectangular in plan view.

[0035] As shown in FIG. 5, the child lid 22 fits into a fitting hole 33 formed in the parent lid body 31 of the parent lid 21. When the child lid 22 fits into the fitting hole 33, the child lid 22 is placed on the first step portion 32a. In this embodiment, as shown in FIG. 3, the child lid 22 has a fitting portion 36 and a protruding portion 37. The fitting portion 36 is a portion that fits into the fitting hole 33. The fitting portion 36 has a shape corresponding to the fitting hole 33, and is disk-shaped here. Here, the maximum diameter of the fitting portion 36 of the child lid 22 is smaller than the maximum diameter of the first vertical surface 41 of the circumferential surface of the fitting hole 33 and is larger than the minimum diameter of the first vertical surface 41. In addition, the diameter of the fitting portion 36 of the child lid 22 is larger than the diameter of the second vertical surface 42. Therefore, the fitting portion 36 of the child lid 22 fits into the first vertical surface 41 of the fitting hole 33 and is placed on the first step portion 32a. The fitting portion 36 is configured not to enter into the second vertical surface 42 on the periphery of the fitting hole 33.

[0036] The protrusion 37 is continuous with the fitting portion 36. The protrusion 37 protrudes radially outward from a portion of the circumferential end of the fitting portion 36. The protrusion 37 fits into the recess 35 provided on the circumferential surface of the fitting hole 33 of the parent lid 21. The shape of the protrusion 37 is not particularly limited, but the protrusion 37 has a shape corresponding to the recess 35, for example. Here, the protrusion 37 has a rectangular parallelepiped shape. In this embodiment, a lifting portion 38 used when removing the child lid 22 from the parent lid 21 is provided on the upper surface of the child lid 22 at a portion opposite the protrusion 37 across the center C1 of the child lid 22.

[0037] In this embodiment, the parent lid 21 and the child lid 22 are made of cast iron. However, the material from which the parent lid 21 and the child lid 22 are made is not particularly limited.

[0038] In this embodiment, when removing the child lid 22 from the parent lid 21, the worker hooks a tool such as a crowbar or a dedicated jig onto the lifting portion 38 and lifts up the child lid 22. At this time, as indicated by arrow A1 in FIG. 6 , the protrusion 37 of the child lid 22 rotates within the recess 35. This rotation of the protrusion 37 causes the child lid 22 to rotate about the protrusion 37 as an axis, and the fitting hole 33 of the parent lid 21 is opened. After the fitting hole 33 is opened, the worker further lifts the child lid 22, causing the protrusion 37 to come out of the recess 35, and the child lid 22 can be removed from the parent lid 21.

[0039] For example, when inspecting the inside of the storage tank 10 in FIG. 2, the worker removes the child lid 22 of the lid 20 attached to the inspection hatch 11 while leaving the parent lid 21 attached, as shown in FIG. 7. The worker then checks the inside of the storage tank 10 through the fitting hole 33 and the inspection hatch 11. When the worker works inside the storage tank 10, for example when cleaning the inside of the storage tank 10, the worker removes the parent lid 21 of the lid 20 attached to the inspection hatch 11. By removing the parent lid 21, the child lid 22 is also removed. In this way, after removing the parent lid 21 and the child lid 22, the worker can enter the storage tank 10 from the inspection hatch 11 and work inside.

[0040] Incidentally, in the storage tank 10 shown in Fig. 2, in the event of a disaster, the temporary toilets 4 can be used by connecting them to the connection ports 13. In the event of a disaster, it is preferable that as many temporary toilets 4 as possible be connected to the storage tank 10. Therefore, in this embodiment, in the event of a disaster, the temporary toilets 4 are connected to the inspection hatch 11 in addition to the connection ports 13 in the storage tank 10, thereby increasing the number of temporary toilets 4 that can be used in the storage tank 10.

[0041] However, when the temporary toilet 4 is connected to the inspection hatch 11, the temporary toilet 4 and the inside of the storage tank 10 are in communication with each other. Therefore, odors emitted from the wastewater stored in the storage tank 10 may leak from the temporary toilet 4 connected to the inspection hatch 11 through the inspection hatch 11. Therefore, in this embodiment, an odor control valve mechanism 50 is attached to the parent cover 21 of the cover 20, making it difficult for odors from the wastewater stored in the storage tank 10 to leak from the inspection hatch 11.

[0042] Next, the anti-odor valve mechanism 50 according to this embodiment will be described. As shown in Fig. 1, the anti-odor valve mechanism 50 includes a tubular portion 51, a flange 52, a seal member 53, and an anti-odor valve .

[0043] Fig. 8 is a cross-sectional view of the anti-odor valve mechanism 50 according to this embodiment. Figs. 9 and 10 are views showing the state in which the anti-odor valve mechanism 50 is attached to the parent lid 21, and correspond to Figs. 5 and 6, respectively. As shown in Fig. 8, the tube portion 51 is cylindrical and extends vertically. The upper end of the tube portion 51 opens upward, and the lower end of the tube portion 51 opens downward.

[0044] As shown in Fig. 9, when the anti-odor valve mechanism 50 is attached to the parent lid 21, the tubular portion 51 is inserted into the fitting hole 33 formed in the parent lid body 31. Therefore, the outer diameter of the tubular portion 51 is smaller than the diameter of the fitting hole 33. In this embodiment, when the anti-odor valve mechanism 50 is attached to the parent lid 21, the vertical positions of the upper end of the tubular portion 51 are the same as the vertical positions of the upper surface of the parent lid 21. However, the upper end of the tubular portion 51 may be located above the upper surface of the parent lid 21 or below the upper surface of the parent lid 21.

[0045] In this embodiment, as shown in FIG. 8, the tube portion 51 has a large diameter tube portion 61, an inclined tube portion 62, and a small diameter tube portion 63. The large diameter tube portion 61 constitutes the upper portion of the tube portion 51. A temporary toilet 4 as shown in FIG. 2 is connected to the large diameter tube portion 61. The inclined tube portion 62 is disposed below the large diameter tube portion 61 and extends downward from the large diameter tube portion 61. The inclined tube portion 62 is inclined radially inward from top to bottom. The inner diameter and outer diameter of the inclined tube portion 62 gradually become smaller from top to bottom. In this embodiment, the inner diameter of the upper end of the inclined tube portion 62 is smaller than the inner diameter of the lower end of the large diameter tube portion 61. Therefore, an inner peripheral step portion 65 is provided between the inner peripheral surface of the large diameter tube portion 61 and the inner peripheral surface of the inclined tube portion 62.

[0046] The small diameter cylindrical portion 63 constitutes the lower portion of the cylindrical portion 51 and is disposed below the inclined cylindrical portion 62. The small diameter cylindrical portion 63 extends downward from the inclined cylindrical portion 62. The inner diameter of the small diameter cylindrical portion 63 is smaller than the inner diameter of the large diameter cylindrical portion 61, and the outer diameter of the small diameter cylindrical portion 63 is smaller than the outer diameter of the large diameter cylindrical portion 61. In this embodiment, an inclined surface 67 is formed on a part of the outer peripheral surface of the small diameter cylindrical portion 63, which is inclined radially inward as it goes downward. Therefore, the inner diameter of the upper end of the small diameter cylindrical portion 63 is larger than the inner diameter of the lower end of the small diameter cylindrical portion 63, and the outer diameter of the upper end of the small diameter cylindrical portion 63 is larger than the outer diameter of the lower end of the small diameter cylindrical portion 63.

[0047] The flange 52 protrudes radially outward from the outer circumferential surface of the cylindrical portion 51. In other words, the flange 52 extends horizontally from the cylindrical portion 51 radially outward. Here, the flange 52 is provided on the large diameter cylindrical portion 61 of the cylindrical portion 51, and protrudes radially outward from the large diameter cylindrical portion 61. However, the position of the flange 52 relative to the cylindrical portion 51 is not particularly limited, and the flange 52 may be provided on, for example, the inclined cylindrical portion 62 or the small diameter cylindrical portion 63.

[0048] In this embodiment, as shown in FIG. 1, the flange 52 is annular along the circumferential direction of the outer circumferential surface of the tubular portion 51. However, a part of the annular flange 52 may be cut out. The shape of the flange 52 is not limited to annular. The inner peripheral shape of the flange 52 has a shape corresponding to the outer peripheral shape of the tubular portion 51, and is circular here. The outer peripheral shape of the flange 52 has a shape corresponding to the fitting hole 33 formed in the parent lid 21, and is circular here. However, for example, when the outer peripheral shape of the tubular portion 51 or the fitting hole 33 is rectangular, the inner peripheral shape and the outer peripheral shape of the seal member 53 may be rectangular. FIG. 11 is an enlarged view of the range A in FIG. 9. When the odor prevention valve mechanism 50 is attached to the parent lid 21, as shown in FIG. 11, at least a part of the flange 52 contacts the first step portion 32a of the parent lid main body 31 and is placed on the first step portion 32a. Here, the radially outer end portion (hereinafter also referred to as the outer end portion) of the flange 52 is placed on the first step portion 32a and is supported by the first step portion 32a.

[0049] As shown in FIG. 8, the seal member 53 is annular and provided on the lower surface of the flange 52. Here, the term "annular" in the seal member 53 refers to a ring-shaped seal member provided around the entire circumference of the tubular portion 51. Here, the term "annular" does not limit the specific shapes of the inner circumference and the outer circumference. In this embodiment, the inner circumference of the seal member 53 has a shape corresponding to the outer circumference of the tubular portion 51, and is circular here. The outer circumference of the seal member 53 has a shape corresponding to the fitting hole 33 formed in the parent lid 21, and is circular here. However, for example, when the outer circumference of the tubular portion 51 or the fitting hole 33 is rectangular, the inner circumference and the outer circumference of the seal member 53 may be rectangular.

[0050] The seal member 53 extends radially outward from the outer circumferential surface of the tubular portion 51 below the flange 52. In this embodiment, the seal member 53 is fixed to the lower surface of the flange 52. The seal member 53 is fixed to the flange 52 by, for example, an adhesive. The seal member 53 is provided on the large diameter tubular portion 61 of the tubular portion 51, similar to the flange 52, but may be provided on the inclined tubular portion 62 or the small diameter tubular portion 63. The seal member 53 may be omitted.

[0051] In this embodiment, the outer diameter L11 of the seal member 53 is smaller than the outer diameter L12 of the flange 52. Therefore, an outer peripheral step portion 71 is provided between the seal member 53 and the flange 52. The outer peripheral step portion 71 is formed by the outer end portion of the flange 52 and the end face of the seal member 53. Here, as shown in FIG. 11, when the odor prevention valve mechanism 50 is attached to the parent lid 21, the outer peripheral step portion 71 is placed on the first step portion 32a of the parent lid 21.

[0052] In this embodiment, as shown in Fig. 8, the thickness L21 of the seal member 53 is thicker than the thickness L22 of the flange 52. Here, "thickness" refers to the length from top to bottom. For example, the thickness L21 of the seal member 53 is at least twice the thickness L22 of the flange 52, preferably at least three times, and particularly preferably at least four times. However, the thickness L21 of the seal member 53 may be the same as the thickness L22 of the flange 52, or may be thinner than the thickness L22 of the flange 52.

[0053] In this embodiment, as shown in Fig. 9, when the odor prevention valve mechanism 50 is attached to the parent lid 21, the sealing member 53 contacts the circumferential surface of the fitting hole 33 of the parent lid 21. In the example of Fig. 11, a part of the bottom surface of the sealing member 53 contacts the second horizontal surface 47 of the circumferential surface of the fitting hole 33. Here, the side surface of the sealing member 53 does not contact the second vertical surface 42 of the circumferential surface of the fitting hole 33, but the side surface of the sealing member 53 may contact the second vertical surface 42.

[0054] The material of the seal member 53 is not particularly limited. In this embodiment, the seal member 53 is formed of a flexible material. Examples of the material of the seal member 53 include rubber and foamed rubber, and among them, ethylene propylene diene rubber (EPDM) is preferable. For example, the seal member 53 may be formed of a hard material as long as it can prevent odors in the storage tank 10 from leaking through the inspection hatch 11.

[0055] As shown in FIG. 1, the seal member 53 is provided with a protrusion 73. The protrusion 73 protrudes outward from the radially outer end of the seal member 53. As shown in FIG. 10, when the odor prevention valve mechanism 50 is attached to the parent lid 21, the protrusion 73 enters the recess 35 of the parent lid 21. Here, the protrusion 73 is placed in the recess 35. However, if it is possible to prevent the odor in the storage tank 10 from leaking from the recess 35 of the parent lid 21 (for example, if the protrusion 73 is in contact with the side surface of the recess 35), the protrusion 73 does not have to be placed in the recess 35, and a slight gap may be formed in a portion between the protrusion 73 and the bottom surface of the recess 35.

[0056] The protrusion 73 has a shape corresponding to the recess 35 of the parent lid 21. Here, as shown in FIG. 1, the protrusion 73 has a rectangular parallelepiped shape. The protrusion 73 is formed integrally with the seal member 53, but may be a separate body from the seal member 53. Here, the protrusion 73 is formed of the same material as the seal member 53. The protrusion 73 is formed of a flexible material, for example, rubber (here, EPDM). In this embodiment, as shown in FIG. 8, the thickness L23 of the protrusion 73 is the same as the thickness L21 of the seal member 53. However, the thickness L23 of the protrusion 73 may be thinner or thicker than the thickness L21 of the seal member 53. In this embodiment, the thickness L23 of the protrusion 73 is smaller than the depth of the recess 35. However, the thickness L23 of the protrusion 73 may be the same as the depth of the recess 35 or may be larger than the depth of the recess 35.

[0057] 8, the odor control valve 54 is provided in the tubular portion 51 so as to be able to open and close the opening on the lower side of the tubular portion 51. In this embodiment, the odor control valve 54 is provided at the lower end of the small diameter tubular portion 63 of the tubular portion 51. The configuration of the odor control valve 54 is not particularly limited. The odor control valve 54 has an arm 81, a support shaft 82, a valve body 83, and a weight 84.

[0058] The arm 81 is provided on the outer peripheral surface of the small diameter cylindrical portion 63 of the cylindrical portion 51. Here, the arm 81 extends radially outward from a portion below the inclined surface 67 of the small diameter cylindrical portion 63. FIG. 12 is a bottom view of the cylindrical portion 51. Note that the valve body 83 and the weight 84 are omitted in FIG. 12. In this embodiment, as shown in FIG. 12, the number of arms 81 is two, and the two arms 81 face each other in the front and rear. However, the number of arms 81 is not particularly limited, and may be one.

[0059] The support shaft 82 is supported by the arms 81, and extends in a direction (here, the front-rear direction) perpendicular to the axial direction (here, the up-down direction) of the cylindrical portion 51. Here, the support shaft 82 is bridged between the two arms 81.

[0060] 8, the valve body 83 can be attached to the lower end of the cylindrical portion 51 (in other words, the lower end of the small diameter cylindrical portion 63). The valve body 83 is configured to open and close the lower opening of the small diameter cylindrical portion 63 of the cylindrical portion 51. The valve body 83 is supported by a support shaft 82, and is supported by an arm 81 via the support shaft 82 so as to be able to swing.

[0061] The shape of the valve body 83 is not particularly limited. In this embodiment, as shown in Fig. 8, the valve body 83 has a vessel shape that opens upward. More specifically, the valve body 83 includes a closure plate portion 85 and an enclosure portion 86. The closure plate portion 85 closes the tubular portion 51 (more specifically, the small diameter tubular portion 63) when the valve body 83 is attached to the lower end of the tubular portion 51. The closure plate portion 85 is plate-shaped. The enclosure portion 86 extends obliquely upward from the edge of the closure plate portion 85 and in a direction away from the closure plate portion 85 when the valve body 83 is attached to the lower end of the tubular portion 51.

[0062] Fig. 13 is a plan view of the valve body 83. As shown in Fig. 13, the valve body 83 is provided with an attachment portion 87 extending toward the opposite side (the right side in Fig. 13) to the cylindrical portion 51 (see Fig. 8) with respect to the axis 82a of the support shaft 82.

[0063] As shown in Fig. 8, weight 84 is disposed on the opposite side of support shaft 82 to valve body 83, and is supported by arm 81 via support shaft 82 so as to be able to swing. In Fig. 8, valve body 83 is disposed on the left side of support shaft 82, and weight 84 is disposed on the right side of support shaft 82. Here, weight 84 is removably attached to mounting portion 87 of valve body 83, and fixed to mounting portion 87 by bolt 88 and washer 89. In this embodiment, valve body 83 and weight 84 are separate bodies, but valve body 83 and weight 84 may be formed integrally.

[0064] In this embodiment, the weight of the weight 84 is greater than the weight of the valve body 83. Therefore, for example, when water such as sewage is not accumulated on the valve body 83, an upward force acts on the valve body 83 around the axis 82a (see FIG. 13) of the support shaft 82. Therefore, as shown in FIG. 8, the valve body 83 is in a closed state. FIG. 14 is a view equivalent to FIG. 10 showing the state in which the valve body 83 is open. On the other hand, for example, when water accumulates on the valve body 83 and the total weight of the water and the valve body 83 becomes greater than the weight of the weight 84, a downward force acts on the valve body 83 around the axis 82a. As a result, the valve body 83 rotates downward around the axis 82a, and the valve body 83 is opened as shown in FIG. 14.

[0065] In this embodiment, a valve seal member 68 may be provided at the lower end of the small diameter cylindrical portion 63 of the cylindrical portion 51. This valve seal member 68 is provided between the small diameter cylindrical portion 63 and the valve body 83 and comes into contact with the valve body 83 when the valve body 83 is attached to the lower end of the cylindrical portion 51. As shown in FIG. 8, when the valve body 83 is closed, the valve seal member 68 is interposed between the valve body 83 and the cylindrical portion 51. This valve seal member 68 improves the sealing performance when the valve body 83 is closed. The valve seal member 68 is, for example, annular rubber.

[0066] The configuration of the anti-odor valve mechanism 50 according to this embodiment has been described above. For example, in normal times other than during a disaster, the anti-odor valve mechanism 50 is not attached to the parent lid 21 as shown in Fig. 5. In normal times, the parent lid 21 is fitted into the lid frame 16 provided at the inspection hatch 11 of the storage tank 10, and the child lid 22 is fitted into the fitting hole 33 of the parent lid main body 31.

[0067] When the storage tank 10 shown in FIG. 2 is used as a discharge destination for wastewater discharged from the temporary toilet 4 in the event of a disaster, the temporary toilet 4 is connected to the inspection hatch 11. At this time, as shown in FIG. 7, first, only the sub-lid 22 of the lid 20 is removed from the inspection hatch 11. Here, a worker first hooks a tool such as a crowbar or a dedicated jig onto the lifting portion 38 of the sub-lid 22 and lifts the sub-lid 22. At this time, as shown by the arrow A1 in FIG. 6, the sub-lid 22 rotates around the protruding portion 37 as an axis, and the fitting hole 33 of the parent lid 21 is opened. By further lifting the sub-lid 22, the protruding portion 37 comes out of the recessed portion 35, and the sub-lid 22 can be removed from the parent lid 21.

[0068] After removing the child lid 22, the worker attaches the anti-odor valve mechanism 50 to the parent lid 21 as shown in FIG. 9. Here, the tubular portion 51 of the anti-odor valve mechanism 50 is inserted from above into the fitting hole 33 formed in the parent lid body 31. At this time, as shown in FIG. 10, the tubular portion 51 may be inserted so that the protrusion 73 provided on the seal member 53 of the anti-odor valve mechanism 50 enters the recess 35 of the parent lid body 31. When the tubular portion 51 is continuously inserted into the fitting hole 33, the outer end portion (here, the outer peripheral step portion 71) of the flange 52 of the anti-odor valve mechanism 50 is placed on the first step portion 32a on the circumferential surface of the fitting hole 33 as shown in FIG. 11. As a result, the anti-odor valve mechanism 50 is supported by the first step portion 32a and attached to the parent lid 21.

[0069] In this way, after the odor control valve mechanism 50 is attached to the main lid 21, the temporary toilet 4 is connected to the inspection hatch 11. The specific configuration of the temporary toilet 4 is not limited in any way. FIG. 15 is a diagram showing an example of the temporary toilet 4. In this embodiment, as shown in FIG. 15, the temporary toilet 4 includes a bowl 4a constituting a toilet bowl, a connecting pipe 5 connected to the bowl 4a, a water supply tank 4b for storing water, and a frame 4c for supporting the bowl 4a and the water supply tank 4b. Here, the temporary toilet 4 can be installed at the inspection hatch 11 by connecting the connecting pipe 5 of the temporary toilet 4 to the upper end of the tubular portion 51 of the odor control valve mechanism 50 (here, the upper end of the large diameter tubular portion 61).

[0070] In this embodiment, when the temporary toilet 4 is not in use, as shown in Fig. 10, the weight of the valve body 83 of the anti-odor valve 54 in the anti-odor valve mechanism 50 is smaller than the weight of the weight 84, so the valve body 83 is attached to the lower end of the tubular part 51. Therefore, odors in the storage tank 10 are unlikely to leak onto the ground through the tubular part 51 of the anti-odor valve mechanism 50 and the temporary toilet 4.

[0071] When the temporary toilet 4 is in use, the wastewater discharged from the temporary toilet 4 flows through the connecting pipe 5 into the tubular portion 51 and accumulates in the valve body 83 attached to the lower end of the tubular portion 51. Then, when the total weight of the valve body 83 and the wastewater accumulated on the valve body 83 becomes greater than the weight of the weight 84, the valve body 83 rotates downward around the support shaft 82 as shown in FIG. 14. This causes the wastewater accumulated on the valve body 83 to fall and be discharged into the storage tank 10. When the wastewater accumulated on the valve body 83 is discharged, the total weight of the valve body 83 and the wastewater accumulated on the valve body 83 becomes smaller than the weight of the weight 84. Therefore, the valve body 83 rotates upward around the support shaft 82, and the valve body 83 is attached to the lower end of the tubular portion 51 as shown in FIG. 10.

[0072] As described above, in this embodiment, as shown in FIG. 5, the lid 20 includes the parent lid 21, the child lid 22, and the odor prevention valve mechanism 50 (see FIG. 1). As shown in FIG. 7, the parent lid 21 includes the parent lid body 31 in which the fitting hole 33 is formed penetrating vertically, and the first step portion 32a protruding radially inward from the peripheral surface of the fitting hole 33. As shown in FIG. 5, the child lid 22 fits into the fitting hole 33 of the parent lid 21. As shown in FIG. 9, the odor prevention valve mechanism 50 is removably provided on the parent lid 21. As shown in FIG. 10, the odor prevention valve mechanism 50 includes a vertically extending tubular portion 51, a flange 52, and an odor prevention valve 54. The flange 52 protrudes radially outward from the peripheral surface of the tubular portion 51 and is placed on the first step portion 32a of the parent lid 21. The odor prevention valve 54 is provided on the tubular portion 51 so as to be able to open and close the lower opening of the tubular portion 51.

[0073] As a result, when attaching the odor prevention valve mechanism 50 to the parent cover 21 of the cover 20, the child cover 22 (see FIG. 5) is removed from the parent cover 21 while the parent cover 21 is installed in the cover frame 16 provided in the inspection hatch 11. Then, with the fitting hole 33 of the parent cover 21 in an open state, the flange 52 of the odor prevention valve mechanism 50 is placed on the first step portion 32a provided on the circumferential surface of the fitting hole 33. As a result, the first step portion 32a of the parent cover 21 supports the flange 52, and the odor prevention valve mechanism 50 can be attached to the parent cover 21. Therefore, even if the size of the outer diameter of the parent cover 21 changes, the odor prevention valve mechanism 50 is attached to the first step portion 32a provided on the circumferential surface of the fitting hole 33, which does not change in size, so that a highly versatile odor prevention valve mechanism 50 that can be attached to parent covers 21 of various sizes can be provided. Furthermore, since the odor prevention valve mechanism 50 can be attached to the parent lid 21 without removing the parent lid 21 from the lid frame 16, the work time required for attaching the odor prevention valve mechanism 50 can be shortened.

[0074] In this embodiment, when the temporary toilet 4 is not installed at the inspection hatch 11 of the storage tank 10, the child lid 22 is fitted into the fitting hole 33 of the parent lid 21 as shown in Fig. 5, thereby making it difficult for odors emitted from the wastewater in the storage tank 10 to leak from the fitting hole 33. When the child lid 22 is removed from the fitting hole 33 to install the temporary toilet 4, the flange 52 of the odor prevention valve mechanism 50 is placed on the first step portion 32a of the parent lid 21 as shown in Fig. 10, and the odor prevention valve mechanism 50 is attached to the parent lid 21. In this way, even when the child lid 22 is removed from the parent lid 21, the odor prevention valve mechanism 50 can be attached to make it difficult for odors to leak.

[0075] In this embodiment, as shown in FIG. 2, the lid 20 is attached to the inspection hatch 11 of the storage tank 10. Since the inspection hatch 11 is not provided with an anti-odor valve mechanism, if the lid 20 is removed from the inspection hatch 11 and a temporary toilet 4 is connected to the inspection hatch 11, odors in the storage tank 10 may leak to the ground through the inspection hatch 11. However, in this embodiment, the child lid 22 is removed from the parent lid 21, and as shown in FIG. 10, the flange 52 of the anti-odor valve mechanism 50 is placed on the first step portion 32a on the periphery of the fitting hole 33 of the parent lid 21, so that the anti-odor valve mechanism 50 can be installed in the inspection hatch 11. Therefore, even if a temporary toilet 4 is connected to the inspection hatch 11, odors in the storage tank 10 can be made less likely to leak to the ground through the inspection hatch 11. Therefore, the number of temporary toilets 4 connected to the storage tank 10 can be increased while making it less likely for odors in the storage tank 10 to leak to the ground.

[0076] In this embodiment, as shown in Fig. 8, the anti-odor valve mechanism 50 includes an annular seal member 53 provided on the underside of the flange 52. As a result, as shown in Fig. 11, when the anti-odor valve mechanism 50 is attached to the parent lid 21, the seal member 53 comes into contact with the circumferential surface of the fitting hole 33 of the parent lid 21 (here, the second horizontal surface 47 of the circumferential surface), thereby improving the sealing performance between the flange 52 of the anti-odor valve mechanism 50 and the circumferential surface of the fitting hole 33 of the parent lid 21. This makes it possible to make it difficult for odors to leak between the flange 52 and the circumferential surface of the fitting hole 33.

[0077] In this embodiment, as shown in FIG. 8, the thickness L21 of the seal member 53 is thicker than the thickness L22 of the flange 52. The seal member 53 is configured to be able to contact the peripheral surface of the fitting hole 33 of the parent lid 21. As a result, a relatively thick seal member 53 is used, so the surface area of ​​the seal member 53 can be increased, and it is easier to make the seal member 53 and the peripheral surface of the fitting hole 33 more closely contact each other. This can further improve the sealing performance between the flange 52 of the odor prevention valve mechanism 50 and the peripheral surface of the fitting hole 33 of the parent lid 21. This can make it more difficult for odor to leak between the flange 52 and the peripheral surface of the fitting hole 33.

[0078] In this embodiment, as shown in FIG. 8, the outer diameter L11 of the seal member 53 is smaller than the outer diameter L12 of the flange 52. An outer peripheral step portion 71 is provided between the radial outside of the seal member 53 and the radial outside of the flange 52. As shown in FIG. 11, the outer peripheral step portion 71 of the odor prevention valve mechanism 50 is placed on the first step portion 32a of the peripheral surface of the fitting hole 33 in the parent lid 21. At this time, the radial outer end of the seal member 53 contacts the peripheral surface of the fitting hole 33. Therefore, the first step portion 32a of the parent lid 21 supports the outer peripheral step portion 71 of the odor prevention valve mechanism 50, and the sealing property between the flange 52 of the odor prevention valve mechanism 50 and the peripheral surface of the fitting hole 33 of the parent lid 21 can be improved.

[0079] In this embodiment, as shown in Fig. 6, the parent lid 21 has a recess 35 that is recessed radially outward from a portion of the circumferential surface of the fitting hole 33 and recessed downward from the upper surface of the parent lid main body 31. As shown in Fig. 3, the child lid 22 has a fitting portion 36 that fits into the fitting hole 33, and a protrusion 37 that is continuous with the fitting portion 36 and fits into the recess 35. As shown in Fig. 10, the seal member 53 of the anti-odor valve mechanism 50 is provided with a protrusion 73 that fits into the recess 35.

[0080] For example, odors emanating from wastewater in the storage tank 10 may leak from the recess 35 of the parent lid 21. However, in this embodiment, when the flange 52 of the anti-odor valve mechanism 50 is placed on the first step portion 32a of the parent lid 21, the protrusion 73 provided on the sealing member 53 enters the recess 35 of the parent lid 21. Thus, the recess 35 is blocked by the protrusion 73. Therefore, even when the anti-odor valve mechanism 50 is attached to the parent lid 21, it is possible to make it difficult for odors to leak from the recess 35 of the parent lid 21.

[0081] In this embodiment, the protrusion 73 is made of rubber (e.g., EPDM). This makes it easier for the protrusion 73 to come into close contact with the surface that forms the recess 35 when the protrusion 73 enters the recess 35 of the parent lid 21. This makes it easier for the recess 35 of the parent lid 21 to be blocked by the protrusion 73, making it more difficult for odors to leak from the recess 35.

[0082] In the above embodiment, the seal member 53 is provided on the lower surface of the flange 52. However, as in the anti-odor valve mechanism 50A according to another embodiment shown in FIG. 16, the seal member 53 may be provided on the upper surface of the flange 52. The seal member 53 extends radially outward from the outer circumferential surface of the tubular portion 51 above the flange 52. In this embodiment, the upper surface of the seal member 53 is at the same height as the upper end of the tubular portion 51. In this embodiment, when the anti-odor valve mechanism 50A is attached to the parent lid 21 of the lid 20, the seal member 53 is disposed at the height of the first vertical surface 41 of the circumferential surface of the fitting hole 33, and the upper surface of the seal member 53 is flush with the ground. Therefore, the recess formed by the first vertical surface 41 of the fitting hole 33 of the parent lid 21, the outer circumferential surface of the tubular portion 51, and the upper surface of the flange 52 is filled with the seal member 53. Therefore, for example, it is possible to prevent the foot of an operator from getting into the recess.

[0083] In the above embodiment, the first step portion 32a of the parent lid 21 is an example of the step portion of the present invention, and the flange 52 of the anti-odor valve mechanism 50 is placed on the first step portion 32a. However, the step portion of the present invention is not limited to the first step portion 32a, and may be, for example, the second step portion 32b or the third step portion 32c provided on the circumferential surface of the fitting hole 33 of the parent lid 21 and disposed below the first step portion 32a. The flange 52 of the anti-odor valve mechanism 50 may be placed on the second step portion 32b of the parent lid 21 or the third step portion 32c.

[0084] In the above embodiment, the inspection hatch 11 to which the lid 20 is attached is formed in the storage tank 10, and the lid 20 is attached to the storage tank 10. However, the inspection hatch 11 is not limited to being formed in the storage tank 10, and the attachment of the lid 20 is not limited to the storage tank 10. For example, the inspection hatch 11 may be formed in a so-called manhole or a tank. The lid 20 may be attached to a manhole or a tank. [Explanation of symbols]

[0085] 20 Lid 21 Parent lid 22 Child cover 31 Main lid body 32a First step (step) 33 Fitting hole 35 Recess 36 Fitting part 37 Convex 50 Odor-proof valve mechanism 51 Cylinder part 52 Flange 53 Sealing material 54 Odor control valve 71 Outer periphery step 73 Protrusion

Claims

1. A lid including a parent lid body having a fitting hole penetrating vertically, a parent lid having a stepped portion protruding radially inward from a circumferential surface of the fitting hole, and a child lid that fits into the fitting hole, the odor prevention valve mechanism being detachably provided on the parent lid, A cylindrical portion extending vertically; a flange that protrudes radially outward from an outer circumferential surface of the cylindrical portion and is placed on the stepped portion of the parent lid; An odor control valve provided on the cylindrical portion so as to be capable of opening and closing a lower opening of the cylindrical portion; an annular seal member provided on an upper surface or a lower surface of the flange; Equipped with the parent lid has a recess that is recessed radially outward from a portion of a circumferential surface of the fitting hole and downward from an upper surface of the parent lid body, The sealing member is provided with a protrusion that fits into the recess, and the odor prevention valve mechanism.

2. The outer diameter of the seal member is smaller than the outer diameter of the flange, 2. The odor control valve mechanism according to claim 1, further comprising an outer circumferential step portion provided between a radially outer side of said seal member and a radially outer side of said flange.

3. The odor control valve mechanism according to claim 1 or 2, a parent lid body having a fitting hole penetrating vertically and a step portion protruding radially inward from a circumferential surface of the fitting hole; A child cover that fits into the fitting hole; Equipped with a lid.

Images