build

Abstract

To provide a lid capable of securing an amount of air flowing into and out of a pipeline even when the pressure inside the pipeline suddenly fluctuates.SOLUTION: A lid 10 comprises: a lid frame 20 that is provided on a pipeline 1; a lid body 30 that can slide up and down with respect to the lid frame 20 and is detachably attached to the lid frame 20; and a cylindrical part 40 that is provided in the lid 30 and has an air intake passage 41 opened upward and downward of the lid 30 formed therein.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a lid.

Background Art

[0002] For example, Patent Document 1 discloses a lid attached to a drainage pipe buried in the ground. Here, the lid is attached to the opening above the cleaning port in the drainage pipe. The lid includes a main body member detachably attached to the opening of the cleaning port, a communication pipe attached to the main body member and communicating the inside and outside of the cleaning port, and a cover member covering the upper part of the communication pipe from above. The communication pipe consists of two pipes: an intake communication pipe through which air flows from the outside to the inside of the cleaning port, and an exhaust communication pipe through which air flows from the inside to the outside of the cleaning port.

[0003] For example, when drainage flows in the drainage pipe, the inside of the drainage pipe can become negative pressure. However, with the lid disclosed in Patent Document 1, it is possible to make it difficult for the inside of the drainage pipe to become negative pressure by allowing air outside the cleaning port to enter through the intake communication pipe. Also, when the pressure inside the drainage pipe can become high, it is possible to suppress the increase in the pressure inside the drainage pipe by discharging air from the inside to the outside of the cleaning port through the exhaust communication pipe.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] As described above, the lid disclosed in Patent Document 1 has two connecting pipes, one for intake and one for exhaust, provided in the main body member. As a result, the cross-sectional area of ​​one connecting pipe is small, which reduces the amount of air that can be drawn in by the intake pipe at one time, and the amount of air that can be exhausted by the exhaust pipe at one time. Consequently, there was a risk that a sufficient amount of air could not be drawn in or exhausted when the pressure in the drainage pipeline suddenly increased or decreased.

[0006] The present invention has been made in view of the above, and its purpose is to provide a lid that can ensure the amount of air flowing inside and outside the pipeline even when the pressure inside the pipeline fluctuates suddenly. [Means for solving the problem]

[0007] The lid according to the present invention comprises a lid frame provided in a pipeline, a lid body that is slidable vertically with respect to the lid frame and detachably attached to the lid frame, and a cylindrical portion provided on the lid body, which has an intake passage formed therein that is open to the upper and lower sides of the lid body.

[0008] With the aforementioned lid, external air flows into the conduit through the intake passage and is drawn in, which prevents negative pressure from forming inside the conduit. Furthermore, when the pressure inside the conduit rises, the lid floats above the lid frame, creating a gap between the lid and the frame. Air inside the conduit is discharged to the outside through this gap, which suppresses the rise in pressure inside the conduit. Thus, with the aforementioned lid, it is not necessary to form an exhaust conduit in the lid, and the area of ​​the intake passage in a plan view can be increased, thus ensuring a sufficient amount of air flowing from the outside to the inside of the conduit. In addition, the gap between the lid and the frame created when the lid floats above the frame is relatively large, so a sufficient amount of air can flow from the inside to the outside of the conduit. Therefore, even if the pressure inside the conduit fluctuates suddenly, a sufficient amount of air can flow inside and outside the conduit.

[0009] According to a preferred embodiment of the present invention, the lid is attached to the lid body so as to cover the intake passage and comprises a cover body having an intake hole that communicates with the intake passage.

[0010] According to the above embodiment, even if, for example, a person or a vehicle is placed on the lid, the intake passage remains in communication with the intake holes formed in the cover body. Therefore, the intake passage is not blocked, and airflow during intake can be ensured.

[0011] According to another preferred embodiment of the present invention, the intake holes are formed in the cover body so as to open to the side.

[0012] According to the above embodiment, even if, for example, a person or a car sits on top of the cover, the air intake vents are less likely to be blocked.

[0013] According to another preferred embodiment of the present invention, the total area of ​​the intake holes is greater than the total area of ​​the intake passage in a plan view.

[0014] According to the above embodiment, during intake, it is possible to easily allow air from outside the conduit to flow into the intake passage through the intake holes of the cover body. Therefore, more air can be drawn in during intake.

[0015] According to another preferred embodiment of the present invention, the lid is provided on the lid body and includes a mounting portion to which the cover body is attached. The mounting portion is located within the intake passage. The lid includes a connecting portion that spans between the cylindrical portion and the mounting portion within the intake passage.

[0016] According to the above embodiment, space for the mounting portion can be secured within the intake passage. Therefore, it is possible to suppress the need to enlarge the cover.

[0017] According to another preferred aspect of the present invention, the cover body has a main body that covers the intake passage from above, and a shaft that extends downward from the main body. The mounting portion has an insertion cylinder portion into which the shaft of the cover body is inserted.

[0018] According to the above aspect, the cover body can be attached to the lid body with a simple configuration in which the shaft of the cover body is inserted into the insertion cylinder portion of the attachment portion.

[0019] According to another preferred aspect of the present invention, the lid includes an opening / closing valve that can open and close the lower end of the intake passage.

[0020] According to the above aspect, at the timing when the opening / closing valve opens the lower end of the intake passage, external air can flow into the pipeline through the intake passage and be inhaled. While the opening / closing valve closes the lower end of the intake passage, it is possible to make it difficult for the odor in the pipeline to leak from the intake passage to the outside.

[0021] According to another preferred aspect of the present invention, the lid includes a protrusion that protrudes upward from the lid body around the intake passage of the cylindrical portion.

[0022] According to the above aspect, foreign matters such as rainwater and sand outside the pipeline are likely to be blocked by the protrusion. Therefore, it is possible to make it difficult for foreign matters such as rainwater and sand to enter the intake passage.

[0023] According to another preferred aspect of the present invention, the lid includes a cover body that is attached to the lid body so as to cover the intake passage and has intake holes formed therein that communicate with the intake passage. The protrusion is covered by the cover body.

[0024] According to the above aspect, for example, even when a person or a vehicle rides on the cover body, it is possible to make it difficult for a load to be applied to the protrusion.

Effects of the Invention

Brief Description of the Drawings

[0026] [Figure 1] It is a plan view showing the lid according to the embodiment. [Figure 2] It is a front view showing the lid according to the embodiment. [Figure 3] It is a cross-sectional view of the lid in the III-III cross-section of FIG. 1. [Figure 4] It is a view corresponding to FIG. 3 showing a state where the lid body floats with respect to the lid frame. [Figure 5] It is a bottom view of the lid body. [Figure 6] It is a front view of the lid body. [Figure 7] It is a plan view showing the lid in a state where the cover body is omitted. [Figure 8] It is a perspective view showing the cover body. [Figure 9] It is a view showing a state where the on-off valve closes the intake passage of the cylindrical portion. [Figure 10] It is a view showing a state where the on-off valve opens the intake passage of the cylindrical portion.

Modes for Carrying Out the Invention

[0027] Hereinafter, embodiments of the lid according to the present invention will be described with reference to the drawings. However, the embodiments described below are merely one embodiment of the present invention and are not intended to particularly limit the present invention. In addition, members and parts having the same function are denoted by the same reference numerals, and overlapping descriptions are omitted or simplified as appropriate.

[0028] Figure 1 is a plan view showing the lid 10 according to this embodiment. Figure 2 is a front view showing the lid 10 according to this embodiment. Figure 3 is a cross-sectional view of the lid 10 in the section III-III of Figure 1. As shown in Figure 3, the lid 10 is installed on a pipeline 1 buried underground. The pipeline 1 has a riser pipe 2. The riser pipe 2 is buried underground and extends vertically. The type of riser pipe 2 is not particularly limited. Here, the riser pipe 2 is, for example, part of a manhole or a drain.

[0029] Although not shown in the diagram, pipeline 1 has a main pipeline. The main pipeline is connected to the lower end of riser pipe 2 and is the pipeline that connects riser pipe 2 to the main sewer line. The main pipeline extends horizontally, for example, and is arranged along a direction that intersects with riser pipe 2. The main pipeline may be composed of multiple pipes, manholes, fittings, etc., or it may be composed of a single pipe.

[0030] In this embodiment, as shown in Figure 3, the lid 10 is provided at the upper end of the riser pipe 2 of the pipeline 1. The lid 10 comprises a lid frame 20 and a lid body 30. The lid frame 20 is provided in the pipeline 1. Here, the lid frame 20 is provided at the upper end of the riser pipe 2 of the pipeline 1. The lid frame 20 is fixed to the riser pipe 2. Here, a communication hole 25 is formed in the lid frame 20 that penetrates vertically, and the lid frame 20 and the riser pipe 2 are in communication through the communication hole 25.

[0031] In this embodiment, the lid frame 20 has a frame cylinder portion 21 that fits into the riser pipe 2, and a frame mounting portion 22 that extends upward from the frame cylinder portion 21 and to which the lid 30 is detachably attached. The lid 30 is detachably fitted into the frame mounting portion 22. The frame mounting portion 22 supports the lid 30. The lid frame 20 has an engaging portion 23 that protrudes radially inward from the inner circumferential surface of the frame cylinder portion 21. The engaging portion 23 is formed in a ring shape. Figure 4 is a diagram corresponding to Figure 3, showing the lid 30 floating relative to the lid frame 20. As will be described in detail later, as shown in Figure 4, the engaging portion 23 is capable of engaging with the stopper 70 of the lid 10, and the engagement of the stopper 70 restricts the upward movement of the lid 30.

[0032] As shown in Figure 3, the lid 30 is detachably attached to the lid frame 20. As shown in Figure 1, in plan view, the lid 30 is circular in shape. However, the shape of the lid 30 is not particularly limited. In this embodiment, the lid 10 has an intake function that draws air from outside the conduit 1 into the conduit 1, and an exhaust function that discharges air from inside the conduit 1 to the outside of the conduit 1. Details of this intake function and exhaust function will be described later.

[0033] In this embodiment, as shown in Figure 3, a sealing member 31 is provided on the side surface of the lid 30 in contact with the lid frame 20. Figure 5 is a bottom view of the lid 30 of the lid 10. Figure 6 is a front view of the lid 30. In Figures 5 and 6, the lid frame 20 is omitted. As shown in Figure 5, the sealing member 31 is provided along the circumferential direction of the lid 30. The sealing member 31 is ring-shaped. The material forming the sealing member 31 is not particularly limited. Here, the sealing member 31 is formed of an elastic member having a predetermined elastic force. For example, rubber can be used as the elastic member. Synthetic rubber (for example, ethylene propylene rubber (EPDM)) can be suitably used as the rubber. This sealing member 31 can improve the airtightness between the lid 30 and the lid frame 20 when the lid 30 is mounted on the lid frame 20.

[0034] In this embodiment, as shown in Figure 3, the lid 10 comprises a cylindrical portion 40 and a cover body 50. The cylindrical portion 40 is provided on the lid body 30. The cylindrical portion 40 is a cylindrical shape extending vertically and is open to the upper and lower sides of the lid body 30. The cylindrical portion 40 may be a separate part from the lid body 30, or it may be integrally formed with the lid body 30. Furthermore, the cylindrical portion 40 may be composed of multiple members, and some of these members may be integrally formed with the lid body 30. Here, the cylindrical portion 40 is a cylindrical shape in which a part penetrates the lid body 30 vertically, and another part extends downward from the lid body 30.

[0035] An intake passage 41 is formed in the cylindrical portion 40. The intake passage 41 is through which air from outside the conduit 1 enters the conduit 1. The intake passage 41 is open to the upper and lower sides of the lid 30. The intake passage 41 penetrates the lid 30 vertically. In other words, the intake passage 41 penetrates the cylindrical portion 40 vertically and extends vertically. In this embodiment, air from outside the conduit 1 (e.g., the ground) can enter the conduit 1 through the intake passage 41 of the cylindrical portion 40. Here, the intake passage 41 of the cylindrical portion 40 functions as an intake function that takes in air from outside the conduit 1 into the conduit 1.

[0036] In this embodiment, as shown in Figure 5, the cylindrical portion 40 is provided at a position eccentric to the lid 30. More specifically, the cylindrical portion 40 is provided on the lid 30 such that, in a bottom view (in other words, a plan view), the center C1 of the intake passage 41 (in other words, the center C1 of the cylindrical portion 40) is at a different position from the center C2 of the lid 30. The cylindrical portion 40 is positioned such that the center C1 of the intake passage 41 (in other words, the cylindrical portion 40) and the center C2 of the lid 30 are offset. Here, the cylindrical portion 40 is provided on the lid 30 such that, in a bottom view (in other words, a plan view), the center C1 of the intake passage 41 (in other words, the cylindrical portion 40) is located closer to the fixed stopper 90 (described later) than the center C2 of the lid 30. That is, the cylindrical portion 40 is provided on the lid 30 so as to be eccentric to the fixed stopper 90 side relative to the lid 30.

[0037] In this embodiment, as shown in Figure 3, the lid 10 is provided with a projection 33. The projection 33 protrudes upward from the lid 30 around the intake passage 41 of the cylindrical portion 40. Figure 7 is a plan view showing the lid 10 with the cover body 50 omitted. As shown in Figure 7, the projection 33 is arranged to surround the intake passage 41 in a plan view. The projection 33 is formed in a cylindrical shape that extends vertically. Here, as shown in Figure 3, the inner circumferential surface of the projection 33 and the inner circumferential surface of the cylindrical portion 40 are continuous.

[0038] The cover body 50 is provided on the upper part of the lid body 30. The cover body 50 is attached to the lid body 30 so as to cover the cylindrical portion 40 (in other words, the intake passage 41). Here, the cover body 50 is attached to the lid body 30 so as to cover the cylindrical portion 40 and the intake passage 41 from above. In a plan view, the cover body 50 overlaps with the cylindrical portion 40. In this embodiment, the cover body 50 is configured to cover the projection 33 together with the cylindrical portion 40. The cover body 50 covers the projection 33 from above, and at least a part of the cover body 50 is positioned above the projection 33. The upper end of the cover body 50 is positioned above the upper end of the projection 33.

[0039] In this embodiment, as shown in Figure 6, the cover body 50 is raised higher than the lid body 30. In other words, the cover body 50 protrudes above the lid body 30. In this embodiment, since the cover body 50 is attached to the upper surface of the lid body 30, the entire cover body 50 protrudes above the lid body 30. Also, as shown in Figure 2, the cover body 50 is raised higher than the lid frame 20 and protrudes above the lid frame 20. The cover body 50 protrudes above the ground.

[0040] The shape and configuration of the cover body 50 are not particularly limited. Figure 8 is a perspective view showing the cover body 50. As shown in Figure 8, the cover body 50 is formed in a so-called umbrella shape. In this embodiment, the cover body 50 has a main body 51 and a shaft 52. As shown in Figure 3, the main body 51 covers the intake passage 41 from above. Here, the main body 51 is configured to cover the projection 33 from above together with the intake passage 41. The shape of the main body 51 are not particularly limited. Here, as shown in Figure 8, the main body 51 is formed in a dome shape that protrudes upward. As shown in Figure 3, the main body 51 has a space inside and opens downward. As shown in Figure 1, in plan view, the main body 51 is circular in shape.

[0041] As shown in Figure 3, the shaft 52 extends downward from the main body 51. Here, the shaft 52 is connected to the center of the main body 51 and extends downward from the back surface of the main body 51. In this embodiment, as shown in Figure 8, the shaft 52 is a cylindrical rod, but it may also be a cylindrical rod. The cross-sectional shape of the shaft 52 is circular. However, the shape of the shaft 52 is not particularly limited. Here, as shown in Figure 3, the lower end of the shaft 52 is at the same vertical position as the lower end of the main body 51. However, the lower end of the shaft 52 may protrude below the lower end of the main body 51, or it may be positioned above the lower end of the main body 51.

[0042] The cover body 50 has an intake hole 55. Here, the intake hole 55 is formed in the main body 51 and is formed to penetrate the main body 51. The intake hole 55 communicates with the inside of the cylindrical portion 40, or in other words, it communicates with the intake passage 41 of the cylindrical portion 40. The intake hole 55 is a hole that connects the outside of the cover body 50 (here, the outside located above the cover body 50) to the intake passage 41. In this embodiment, the intake hole 55 does not open upwards, but opens to the side.

[0043] The number of intake holes 55 is not particularly limited. Here, as shown in Figure 8, multiple intake holes 55 are formed in the cover body 50 (more specifically, the main body 51). Specifically, there are eight intake holes 55. The multiple intake holes 55 are formed in the main body 51 so as to be aligned along the circumferential direction of the cover body 50. The multiple intake holes 55 are formed on the side surface of the main body 51. Here, the spacing between adjacent intake holes 55 is the same, but it may be different.

[0044] In this embodiment, as shown in Figure 7, the lid 10 includes a mounting portion 35 and a connecting portion 38. The mounting portion 35 is provided on the lid body 30. As shown in Figure 3, a cover body 50 is attached to the mounting portion 35. By attaching the cover body 50 to the mounting portion 35, it is attached to the lid body 30. The position and configuration of the mounting portion 35 relative to the lid body 30 are not particularly limited. In this embodiment, as shown in Figure 7, the mounting portion 35 is located inside the cylindrical portion 40, i.e., within the intake passage 41. The mounting portion 35 is located within the intake passage 41 at a predetermined distance from the inner circumferential surface of the cylindrical portion 40. Here, as shown in Figure 3, the mounting portion 35 extends vertically and has a cylindrical outer shape.

[0045] In this embodiment, as shown in Figure 7, the mounting portion 35 and the inner circumferential surface of the cylindrical portion 40 are connected by a connecting portion 38. The connecting portion 38 spans between the cylindrical portion 40 and the mounting portion 35 within the intake passage 41. The connecting portion 38 is connected to the inner circumferential surface of the cylindrical portion 40 and the outer circumferential surface of the mounting portion 35. The shape of the connecting portion 38 is not particularly limited. Here, the connecting portion 38 is a rod-shaped object extending radially outward from the mounting portion 35. The cross-sectional shape of the connecting portion 38 is rectangular, but is not particularly limited. The cross-sectional shape of the connecting portion 38 may be circular.

[0046] The number of connecting portions 38 is not particularly limited. Here, as shown in Figure 7, there are four connecting portions 38. The four connecting portions 38 are arranged along the circumferential direction of the mounting portion 35, and the spacing between adjacent connecting portions 38 in the circumferential direction is the same. Here, the four connecting portions 38 form a cross shape.

[0047] In a plan view, the proportion of the area of ​​the intake passage 41 occupied by the connecting portion 38 is not particularly limited. For example, in a plan view, the proportion of the area of ​​the intake passage 41 occupied by the connecting portion 38 is 1 / 2 or less, preferably 1 / 5 or less, and particularly preferably 1 / 8 or less.

[0048] In this embodiment, the total area of ​​the intake holes 55 formed in the cover body 50 is greater than the total area of ​​the intake passage 41 in a plan view. Here, the total area of ​​the intake holes 55 refers to the sum of the areas of the multiple intake holes 55 (eight intake holes 55 in this embodiment) if there are multiple intake holes 55. Also, as shown in Figure 7, the intake passage 41 is divided into four sections by the connecting section 38 in a plan view. The total area of ​​the intake passage 41 refers to the sum of the areas of the four sections of the intake passage 41 in a plan view. Here, the total area of ​​the intake holes 55 is 1.1 times or more the total area of ​​the intake passage 41 in a plan view, preferably 1.3 times or more, and particularly preferably 1.5 times or more.

[0049] In this embodiment, the mounting portion 35 has an insertion cylinder portion 36. As shown in Figure 3, the shaft 52 of the cover body 50 is inserted into the insertion cylinder portion 36. The insertion cylinder portion 36 is recessed downward from the upper surface of the mounting portion 35. Here, the insertion cylinder portion 36 has a shape corresponding to the shaft 52 of the cover body 50. The shaft 52 is fitted into the insertion cylinder portion 36. In this embodiment, the cover body 50 is fixed to the lid body 30. Specifically, the cover body 50 is adhesively fixed to the mounting portion 35 of the lid body 30 via adhesive. Therefore, when the shaft 52 of the cover body 50 is inserted into the insertion cylinder portion 36, the shaft 52 is configured not to rotate relative to the insertion cylinder portion 36. However, the cover body 50 does not have to be fixed (e.g., adhesively fixed) to the lid body 30. The cover body 50 may be configured to rotate relative to the lid body 30.

[0050] In this embodiment, the lid 10 is equipped with an on-off valve 60. Figure 9 shows the state in which the on-off valve 60 is closing the intake passage 41 of the cylindrical portion 40. Figure 10 shows the state in which the on-off valve 60 is opening the intake passage 41 of the cylindrical portion 40. As shown in Figures 9 and 10, the on-off valve 60 opens and closes the lower end of the cylindrical portion 40. Here, opening and closing the cylindrical portion 40 means opening and closing the intake passage 41 formed in the cylindrical portion 40. As shown in Figure 4, by closing the cylindrical portion 40 with the on-off valve 60, it is possible to suppress the leakage of odors in the pipeline 1 to the outside through the intake passage 41 of the cylindrical portion 40. Here, as shown in Figure 3, the on-off valve 60 is attached to the lid 30. More specifically, the on-off valve 60 is attached to the cylindrical portion 40. As shown in Figure 10, the on-off valve 60 has an arm 61, a support shaft 62, a valve body 63, and a weight 64.

[0051] The arms 61 are provided on the outer circumferential surface of the cylindrical portion 40. In this embodiment, as shown in Figure 5, there are two arms 61. The two arms 61 face each other across a straight line L1 passing through the center C1 of the cylindrical portion 40 when viewed from below. However, the number of arms 61 is not particularly limited, and there may be, for example, only one.

[0052] The support shaft 62 is supported by the arm 61 and extends in a direction perpendicular to the axial direction of the vertically extending cylindrical portion 40. Here, the support shaft 62 spans two arms 61. As shown in Figure 9, the valve body 63 can be attached to the lower end of the cylindrical portion 40. The valve body 63 is configured to open and close the lower opening in the cylindrical portion 40. As shown in Figures 9 and 10, the valve body 63 is supported by the support shaft 62 and is pivotably supported by the arm 61 via the support shaft 62. The shape of the valve body 63 is not particularly limited. In this embodiment, as shown in Figure 3, the valve body 63 is flat and circular in shape. The valve body 63 is large enough to cover the cylindrical portion 40 from below. As shown in Figure 9, the valve body 63 is provided with a mounting portion 63a that extends toward the opposite side of the cylindrical portion 40 from the support shaft 62.

[0053] The weight 64 is positioned on the opposite side of the valve body 63 from the support shaft 62 and is pivotably supported on the arm 61 via the support shaft 62. In Figure 9, the valve body 63 is positioned to the left of the support shaft 62, and the weight 64 is positioned to the right of the support shaft 62. Here, the weight 64 is detachably attached to the mounting portion 63a of the valve body 63 and is fixed to the mounting portion 63a by bolts 66 and washers 67. In this embodiment, the valve body 63 and the weight 64 are separate parts, but the valve body 63 and the weight 64 may be integrally molded.

[0054] In this embodiment, the weight of the counterweight 64 is greater than the weight of the valve body 63. Therefore, under normal circumstances, when the difference between the pressure inside the pipeline 1 and the pressure outside the pipeline 1, in other words, the difference between the pressure below the valve body 63 and the pressure above the valve body 63 is small, an upward force acts on the valve body 63 around the support shaft 62. As a result, as shown in Figure 9, the valve body 63 closes the cylindrical portion 40 (in other words, the intake passage 41). On the other hand, when the pressure inside the pipeline 1 becomes lower than the pressure outside the pipeline 1, and the difference becomes large, a downward force acts on the valve body 63 around the support shaft 62. As a result, the valve body 63 rotates downward around the support shaft 62, and as shown in Figure 10, the valve body 63 opens the cylindrical portion 40 (in other words, the intake passage 41).

[0055] In this embodiment, as shown in Figure 10, an elastic member 45 is provided at the lower end of the cylindrical portion 40. As shown in Figure 5, the elastic member 45 is formed in a ring shape. As shown in Figure 9, the elastic member 45 is capable of contacting the on-off valve 60. Here, when the valve body 63 of the on-off valve 60 closes the lower end of the cylindrical portion 40, the valve body 63 comes into contact with the elastic member 45. Therefore, when the valve body 63 is closing the cylindrical portion 40, the elastic member 45 is interposed between the valve body 63 and the cylindrical portion 40. The elastic member 45 is attached to a portion of the cylindrical portion 40 that can contact the valve body 63. Here, the elastic member 45 is provided at the lower end of the cylindrical portion 40 so as to protrude downward from the lower end of the cylindrical portion 40. When the valve body 63 closes the intake passage 41 via this elastic member 45, the sealing performance between the cylindrical portion 40 and the on-off valve 60 can be improved.

[0056] The type of elastic member 45 is not particularly limited. The elastic member 45 has a predetermined elastic force and is formed of, for example, rubber. Synthetic rubber (for example, ethylene propylene rubber (EPDM)) can be suitably used as the rubber.

[0057] As shown in Figures 3 and 4, the lid 30 is slidable vertically relative to the lid frame 20. As shown in Figure 4, for example, the lid 30 floats relative to the lid frame 20. When the lid 30 floats relative to the lid frame 20, a gap S1 is formed between the lid 30 and the lid frame 20. Through the gap S1 between the lid 30 and the lid frame 20, the air inside the pipeline 1 is discharged to the outside of the pipeline 1. Therefore, in this embodiment, when the lid 30 floats relative to the lid frame 20, the gap S1 formed between the lid 30 and the lid frame 20 functions as an exhaust function that discharges the air inside the pipeline 1 to the outside of the pipeline 1.

[0058] In this embodiment, as shown in Figure 3, the lid 10 is equipped with a stopper 70. As shown in Figure 4, the stopper 70 engages with the lid frame 20. Here, the stopper 70 engages with the lid frame 20 when the lid 30 floats above the lid frame 20. When the stopper 70 engages with the lid frame 20, it restricts further upward movement of the lid 30. In this embodiment, when the lid 30 floats above the lid frame 20, the stopper 70 engages with the engaged portion 23 of the lid frame 20 from below. The stopper 70 extends downward from the back surface of the lid 30.

[0059] Here, the stopper 70 includes a rotating stopper 80 and a fixed stopper 90. The types of stopper 70 include a rotating stopper 80 and a fixed stopper 90. The rotating stopper 80 rotates in the circumferential direction relative to the cover 30. In this embodiment, as shown in Figure 1, a mounting hole 32 is formed in the cover 30. As shown in Figure 3, the mounting hole 32 is a hole that penetrates the cover 30 vertically. As shown in Figure 1, the shape of the mounting hole 32 is circular. The size of the mounting hole 32 is not particularly limited. Here, as shown in Figure 7, the mounting hole 32 is smaller than the intake passage 41 in a plan view.

[0060] The rotating stopper 80 is rotatably fitted into the mounting hole 32 of the lid 30. While fitted into the mounting hole 32, the rotating stopper 80 can rotate relative to the mounting hole 32, for example, along arrow A1. The configuration of the rotating stopper 80 is not particularly limited. In this embodiment, as shown in Figure 3, the rotating stopper 80 has a fitting portion 85, a vertical portion 81, and a horizontal portion 82. The fitting portion 85 is the part that is fitted into the mounting hole 32 and has a shape corresponding to the mounting hole 32. Here, as shown in Figure 1, the fitting portion 85 is circular in plan view.

[0061] As shown in Figure 3, the vertical portion 81 extends downward from the mounting hole 32. Here, the vertical portion 81 is connected to the fitting portion 85 and extends downward from the back surface of the fitting portion 85. In this embodiment, the vertical portion 81 is composed of a plurality of rod-shaped portions 83. The number of rod-shaped portions 83 is three, but is not particularly limited. In this embodiment, the rod-shaped portion 83 has a main rod-shaped portion 83a connected to the fitting portion 85 and two sub-rod-shaped portions 83b arranged on either side of the main rod-shaped portion 83a. The lower ends of the two sub-rod-shaped portions 83b are connected to the lower ends of the main rod-shaped portion 83a. The main rod-shaped portion 83a and the sub-rod-shaped portions 83b each extend vertically, and the distance between them narrows as they extend downward.

[0062] The horizontal section 82 extends radially outward from the vertical section 81 and is engageable with the cover frame 20. The horizontal section 82 is connected to the lower end of the vertical section 81 and extends laterally from the lower end of the vertical section 81. Specifically, the horizontal section 82 is connected to the lower end of the main rod-shaped section 83a and to the lower ends of the two sub-rod-shaped sections 83b.

[0063] In this embodiment, the rotation of the rotating stopper 80 relative to the mounting hole 32 changes the circumferential position of the lateral portion 82. Here, the rotating stopper 80 has a jig insertion portion 86 and a marker 87. The jig insertion portion 86 is the part into which the jig is inserted. The jig insertion portion 86 is provided on the upper surface of the rotating stopper 80, on a surface from which the jig can be inserted from above the lid 10. Here, the jig insertion portion 86 is provided on the upper surface of the fitting portion 85 of the rotating stopper 80. The configuration and shape of the jig insertion portion 86 are not particularly limited. In this embodiment, the jig insertion portion 86 is a groove recessed downward from the upper surface of the rotating stopper 80. The jig insertion portion 86 extends in a predetermined direction in a plan view. More specifically, the jig insertion portion 86 is a groove that extends in the same direction as the direction in which the lateral portion 82 extends in a plan view.

[0064] The jig inserted into the jig insertion section 86 is used to remove the lid 30 from the lid frame 20. The jig is also used to rotate the rotation stopper 80 relative to the mounting hole 32. The type of jig inserted into the jig insertion section 86 is not particularly limited, but it has a shape that corresponds to the jig insertion section 86. In this case, the jig inserted into the jig insertion section 86 is, for example, a flathead screwdriver.

[0065] The marker 87 is a marker that allows the worker to determine the orientation of the lateral portion 82 of the rotation stopper 80, which is located below the lid 30, even when viewing the lid 10 from above. Here, the marker 87 is formed on the upper surface of the rotation stopper 80, for example, on the upper surface of the fitting portion 85. Since the fitting portion 85 rotates together with the lateral portion 82, the orientation of the marker 87 changes when the orientation of the lateral portion 82 changes. The type of marker 87 is not particularly limited, but here it is an arrow. The lateral portion 82 extends in the direction pointed to by the arrow, which is the marker 87. In this embodiment, a jig insertion portion 86 is provided within the marker 87.

[0066] In this embodiment, when removing the lid 30 from the lid frame 20, a tool (for example, a flathead screwdriver) is inserted into the tool insertion section 86. In this state, the worker can remove the lid 30 from the lid frame 20 by operating the tool to lift the lid 30. Also, when attaching the lid 30 to the lid frame 20, for example, the rotation stopper 80 is rotated so that the side portion 82 extends inward from the lid 30. At this time, for example, with the tool inserted into the tool insertion section 86, the tool is rotated relative to the mounting hole 32. This allows the rotation stopper 80 to be rotated so that the side portion 82 extends inward from the lid 30. As a result, the lid 30 can be attached to the lid frame 20 without the side portion 82 of the rotation stopper 80 contacting the engaged portion 23 of the lid frame 20.

[0067] In this embodiment, the lid 30 can be easily removed from the lid frame 20 by a method other than inserting a jig into the jig insertion section 86. Here, as shown in Figure 1, the lid 30 is provided with a recess 39. The recess 39 is provided on the periphery of the lid 30. The recess 39 is provided on the periphery of the lid 30 on the side of the rotation stopper 80, and is recessed inward from the periphery of the lid 30. More specifically, the recess 39 is provided on the periphery of the lid 30 that is on the side of the rotation stopper 80 than the cylindrical portion 40, and on the side of the rotation stopper 80 opposite to the cylindrical portion 40. In a plan view, the rotation stopper 80 is positioned between the recess 39 and the cylindrical portion 40. The recess 39 is provided on the lid 30 so as to be exposed from the upper surface of the lid 30.

[0068] Here, a removal tool is inserted into the recess 39. The removal tool inserted into the recess 39 is used to remove the lid 30 from the lid frame 20. The type of removal tool is not particularly limited, but for example, a flathead screwdriver is used. In a plan view, the recess 39 has a shape corresponding to the portion of the removal tool that is inserted into the recess 39. In this embodiment, the recess 39 is formed in a U-shape.

[0069] When removing the lid 30 from the lid frame 20 using the recess 39, first rotate the rotation stopper 80 so that its lateral portion 82 extends inward towards the lid 30. Then, insert the removal tool into the recess 39 and lift the portion of the lid 30 around the recess 39. At this time, due to the lever principle, the portion of the lid frame 20 that contacts the portion of the lid 30 around the fixed stopper 90 becomes the fulcrum, and the portion around the recess 39 becomes the point of force application, so the lid 30 can be easily lifted. Furthermore, when lifting the lid 30, the lateral portion 82 of the rotation stopper 80 extends inward towards the lid 30 and does not interfere with the lid frame 20, nor does the fixed stopper 90 interfere with the lid frame 20. Therefore, the lid 30 can be easily removed from the lid frame 20.

[0070] It is conceivable that the recess 39 be provided on the periphery of the lid 30 on the side of the fixed stopper 90. However, in that case, if the portion of the lid 30 around the recess 39 is lifted by the lever principle, the claw portion 91 of the fixed stopper 90 (described later) may interfere with the lid frame 20. Therefore, it is preferable that the recess 39 be provided on the periphery of the lid 30 on the side of the rotating stopper 80.

[0071] Here, as shown in Figure 3, with the lateral portion 82 extending outward from the lid 30, the tip of the lateral portion 82 is located radially outward from the radial inner end of the engaged portion 23 of the lid frame 20. Therefore, as shown in Figure 4, when the lid 30 floats up relative to the lid frame 20, the lateral portion 82 of the rotation stopper 80 engages with the engaged portion 23 of the lid frame 20 from below, restricting further upward movement of the lid 30.

[0072] Unlike the rotating stopper 80, the fixed stopper 90 does not rotate relative to the lid 30. The fixed stopper 90 extends downward from the back surface of the lid 30. The configuration of the fixed stopper 90 is not particularly limited. In this embodiment, the fixed stopper 90 has a fixed rod-shaped portion 93 and a claw portion 91. The fixed rod-shaped portion 93 is a rod-shaped object that extends downward from the back surface of the lid 30. As shown in Figure 4, the claw portion 91 engages with the lid frame 20. Here, when the lid 30 floats relative to the lid frame 20, the claw portion 91 engages with the engaged portion 23 of the lid frame 20 from below. The claw portion 91 protrudes outward from the fixed rod-shaped portion 93 toward the outside of the lid 30. Here, the claw portion 91 is connected to the lower end of the fixed rod-shaped portion 93. The vertical position of the claw portion 91 is the same as the vertical position of the lateral portion 82 of the rotating stopper 80. The fixed stopper 90 may be integrally formed with the lid 30, or it may be a separate component from the lid 30.

[0073] In this embodiment, when the lid 30 is attached to the lid frame 20, the tip of the claw portion 91 (here, the radially outer end) is located radially outward from the radially inner end of the engaged portion 23 of the lid frame 20. Therefore, as shown in Figure 4, when the lid 30 floats up relative to the lid frame 20, the claw portion 91 of the fixing stopper 90 engages with the engaged portion 23 from below, restricting further upward movement of the lid 30.

[0074] As shown in Figure 5, the rotating stopper 80 and the fixed stopper 90 are positioned opposite each other in a plan view, with the cylindrical portion 40 (in other words, the intake passage 41) in between. Here, the rotating stopper 80 is positioned on the side of the intake passage 41 that is closer to the mounting hole 32. The fixed stopper 90 is positioned on the side of the intake passage 41 that is opposite to the mounting hole 32. The number of rotating stoppers 80 and fixed stoppers 90 is not particularly limited. There may be one rotating stopper 80, but there may be more than one. Here, there are two fixed stoppers 90, but there may be one, or there may be three or more. The two fixed stoppers 90 are positioned on the side of the intake passage 41 that is opposite to the mounting hole 32.

[0075] Here, the lid 10 is mainly made of resin material or cast iron material. Specifically, the parts of the lid 10 excluding the sealing member 31 and the elastic member 45 (for example, the lid frame 20, lid body 30, mounting part 35, cylindrical part 40, cover body 50, stopper 70, etc.) are made of resin material, but may also be made of cast iron material. For example, rigid polyvinyl chloride resin can be suitably used as the resin material.

[0076] The configuration of the lid 10 according to this embodiment has been described above. Next, the method of using the lid 10 will be described. First, when attaching the lid 30 to the lid frame 20, the rotating stopper 80 is rotated relative to the mounting hole 32 so that the tip of the lateral portion 82 of the rotating stopper 80 faces inward towards the lid 30. At this time, for example, the rotating stopper 80 can be rotated by rotating the jig relative to the mounting hole 32 while the jig is inserted into the jig insertion portion 86. Note that as the rotating stopper 80 rotates, the orientation of the marker 87 changes, so by knowing the orientation of the marker 87, the orientation of the lateral portion 82 of the rotating stopper 80 can be determined. After that, as shown in Figure 3, the lid 30 is attached to the lid frame 20 so that the lateral portion 82 of the rotating stopper 80 and the claw portion 91 of the fixed stopper 90 are positioned below the engaged portion 23 of the lid frame 20. After attaching the lid 30 to the lid frame 20, the rotation stopper 80 is rotated relative to the mounting hole 32 so that the tip of the lateral portion 82 of the rotation stopper 80 faces outward from the lid 30. At this time as well, the rotation stopper 80 can be rotated by rotating the jig relative to the mounting hole 32 while the jig is inserted into the jig insertion portion 86.

[0077] With the lid 30 attached to the lid frame 20, as shown in Figure 9, the intake passage 41 of the cylindrical portion 40 is closed by the on-off valve 60. For example, if a large amount of wastewater is discharged into the main sewer pipe from the full pipe 1, a negative pressure state may be created inside the pipe 1. At this time, the pressure inside the pipe 1 becomes lower than the pressure outside the pipe 1. When the pressure difference between the inside and outside of the pipe 1 at this time becomes higher than a predetermined first reference pressure, a downward force acts on the valve body 63 of the on-off valve 60 around the support shaft 62 in the lid 10. As a result, as shown in Figure 10, the valve body 63 rotates downward around the support shaft 62, causing the valve body 63 to open the intake passage 41. As a result, as shown in Figure 3, outside the pipe 1 is introduced into the intake passage 41 through the intake hole 55 of the cover body 50. The air introduced into the intake passage 41 enters the pipe 1, increasing the pressure inside the pipe 1 and making it less likely for negative pressure to occur.

[0078] In this embodiment, when the amount of wastewater flowing through the pipeline 1 increases, the pressure inside the pipeline 1 rises. At this time, the pressure inside the pipeline 1 becomes higher than the pressure outside the pipeline 1. When the pressure difference between the inside and outside of the pipeline 1 at this time becomes higher than a predetermined second reference pressure, the lid 30 floats up relative to the lid frame 20, as shown in Figure 4. When the lid 30 floats up, the lateral portion 82 of the rotating stopper 80 and the claw portion 91 of the fixed stopper 90 engage with the engaged portion 23 of the lid frame 20 from below. By engaging the lateral portion 82 of the rotating stopper 80 and the claw portion 91 of the fixed stopper 90 with the engaged portion 23 in this way, the lid 30 is prevented from moving further upward. Note that when the lid 30 floats up relative to the lid frame 20, the intake passage 41 of the cylindrical portion 40 is closed by the on / off valve 60.

[0079] As the lid 30 floats above the lid frame 20, a gap S1 is formed between the lid frame 20 and the lid 30. This allows air inside the pipeline 1 to flow out of the pipeline 1 through the gap S1 between the lid frame 20 and the lid 30. As a result, the pressure inside the pipeline 1 decreases. When the pressure inside the pipeline 1 decreases and the pressure difference between the inside and outside of the pipeline 1 falls below the second reference pressure mentioned above, the lid 30 moves downward relative to the lid frame 20, as shown in Figure 3, and the lid 30 is attached to the lid frame 20.

[0080] In this embodiment, the lid 10 comprises a lid frame 20, a lid body 30, a cylindrical portion 40, and a cover body 50. The lid frame 20 is provided on the conduit 1 (specifically the vertical pipe 2). As shown in Figures 3 and 4, the lid body 30 is slidable vertically relative to the lid frame 20 and is detachably attached to the lid frame 20. The cylindrical portion 40 is provided on the lid body 30. The cylindrical portion 40 has an intake passage 41 that opens upward and downward toward the lid body 30. The cover body 50 is attached to the lid body 30 so as to cover the intake passage 41. The cover body 50 has an intake hole 55 that communicates with the intake passage 41. As a result, as shown in Figure 3, external air flows into the conduit 1 through the intake passage 41 and is drawn in, which prevents the inside of the conduit 1 from becoming negatively pressurized. Furthermore, when the pressure inside the pipeline 1 rises, as shown in Figure 4, the lid 30 floats above the lid frame 20, creating a gap S1 between the lid frame 20 and the lid 30. Air inside the pipeline 1 is discharged to the outside through this gap S1, thereby suppressing the rise in pressure inside the pipeline 1. Thus, in this embodiment, it is not necessary to form an exhaust pipeline (for example, an exhaust connecting pipe as described in Patent Document 1) in the lid 30, and the area of ​​the intake passage 41 in plan view can be increased, thus ensuring a sufficient amount of air flowing from the outside to the inside of the pipeline 1. Also, the gap S1 between the lid frame 20 and the lid 30 (see Figure 4) created when the lid 30 floats above the lid frame 20 is relatively large, so a sufficient amount of air can flow from the inside to the outside of the pipeline 1. Therefore, even if the pressure inside the pipeline 1 fluctuates suddenly, a sufficient amount of air can flow inside and outside the pipeline 1.

[0081] Furthermore, in this embodiment, the cover body 50 is attached to the lid body 30 so as to cover the intake passage 41, and the cover body 50 has an intake hole 55 that communicates with the intake passage 41. Therefore, even if a person or a car is placed on top of the lid 10, for example, the intake passage 41 is in communication with the intake hole 55 formed in the cover body 50. Thus, the intake passage 55 is not blocked, and airflow during intake can be ensured.

[0082] In this embodiment, as shown in Figure 6, the cover body 50 is raised higher than the lid body 30. This increases the surface area of ​​the cover body 50. Therefore, there are more options for the location in which the intake holes 55 are formed on the cover body 50. Consequently, it is easier to form the intake holes 55 on the cover body 50 in an appropriate location (for example, on the side of the cover body 50).

[0083] In this embodiment, as shown in Figure 8, the intake port 55 is formed in the cover body 50 so as to open to the side. This makes it difficult for the intake port 55 to be blocked, for example, if a person or a vehicle is placed on top of the cover body 50.

[0084] In this embodiment, the total area of ​​the intake holes 55 (here, the sum of the areas of the eight intake holes 55) is larger than the total area of ​​the intake passage 41 in a plan view (here, the sum of the areas of the intake passage 41 divided into four sections by the connecting portion 38 in a plan view). This makes it easier for air from outside the conduit 1 to flow into the intake passage 41 through the intake holes 55 of the cover body 50 during intake. Therefore, more air can be drawn in during intake.

[0085] In this embodiment, as shown in Figure 3, the lid 10 is provided on the lid body 30 and includes a mounting portion 35 to which the cover body 50 is attached. As shown in Figure 7, the mounting portion 35 is located within the intake passage 41. The lid 10 includes a connecting portion 38 that spans between the cylindrical portion 40 and the mounting portion 35 within the intake passage 41. This makes it possible to secure space within the intake passage 41 for arranging the mounting portion 35 for attaching the cover body 50. Thus, it is possible to suppress the increase in size of the lid 10.

[0086] In this embodiment, as shown in Figure 3, the cover body 50 has a main body 51 that covers the intake passage 41 from above, and a shaft 52 that extends downward from the main body 51. The mounting portion 35 has an insertion cylinder portion 36 into which the shaft 52 of the cover body 50 is inserted. This allows the cover body 50 to be attached to the lid body 30 with a simple configuration of inserting the shaft 52 of the cover body 50 into the insertion cylinder portion 36 of the mounting portion 35.

[0087] In this embodiment, as shown in Figures 9 and 10, the lid 10 is equipped with an on-off valve 60 that can open and close the lower end of the intake passage 41. As a result, as shown in Figure 3, when the on-off valve 60 opens the lower end of the intake passage 41, outside air can flow into the pipeline 1 through the intake passage 41 and be drawn in. On the other hand, as shown in Figure 4, while the on-off valve 60 is closed the lower end of the intake passage 41, odors in the pipeline 1 are less likely to leak out of the intake passage 41 to the outside.

[0088] In this embodiment, as shown in Figure 9, an elastic member 45 that contacts the on-off valve 60 is provided at the lower end of the cylindrical portion 40. This improves the sealing between the cylindrical portion 40 and the on-off valve 60 when the on-off valve 60 is closing the lower end of the intake passage 41.

[0089] In this embodiment, as shown in Figure 3, the lid 10 is provided with a projection 33 that protrudes upward from the lid body 30 around the intake passage 41 of the cylindrical portion 40. This makes it easier for foreign matter such as rainwater and sand outside the pipe 1 to be blocked by the projection 33. Therefore, it is possible to make it difficult for foreign matter such as rainwater and sand to enter the intake passage 41.

[0090] In this embodiment, the projection 33 is covered by the cover body 50. This makes it difficult for load to be applied to the projection 33, even if, for example, a person or a vehicle is sitting on the cover body 50.

[0091] In this embodiment, the pipeline 1 on which the cover 10 is provided is a pipeline through which drainage (especially sewage) flows, and the cover 10 is a cover for sewage. However, the pipeline 1 may also be a pipeline through which rainwater flows. The cover 10 may also be a cover for rainwater. [Explanation of Symbols]

[0092] 1 conduit 10 Lid 20 Lid frame 30 Lid 32 mounting holes 33 Protrusion 35 Mounting part 36 Insertion tube section 38. Delivery section 40 Cylindrical part 41 Intake passage 45 Elastic members 50 Cover Body 51 Main unit 52 axes 55 Intake port 60 Shut-off valves 61 Arm 62 Support shaft 63 Valve body 64 Weight 70 Stopper 80-degree rotation stopper 81 Vertical section 82 Side view 90 Fixed stopper 91 Nail part

Claims

1. A cover frame installed in the pipeline, A lid that is slidable vertically with respect to the lid frame and is detachably attached to the lid frame, A cylindrical portion provided on the cover, having an intake passage formed therein that is open to the upper and lower parts of the cover, Equipped with, The lid is a lid that can float relative to the lid frame when the pressure inside the pipeline increases.

2. The lid according to claim 1, comprising a cover body attached to the lid body so as to cover the intake passage, and having an intake hole formed therein that communicates with the intake passage.

3. The lid according to claim 2, wherein the intake holes are formed in the cover body so as to open to the side.

4. The lid according to claim 2, wherein the total area of ​​the intake holes is greater than the total area of ​​the intake passage in a plan view.

5. The lid according to claim 2, comprising a mounting portion provided on the lid body and to which the cover body is attached.

6. The mounting portion is located within the intake passage. The lid according to claim 5, further comprising a connecting portion that spans between the cylindrical portion and the mounting portion within the intake passage.

7. The cover body is, A main body that covers the aforementioned intake passage from above, A shaft extending downward from the main body, It has, The lid according to claim 5, wherein the mounting portion has an insertion tube portion into which the shaft of the cover body is inserted.

8. The lid according to claim 1, further comprising an opening / closing valve that can open and close the lower end of the intake passage.

9. A lid according to any one of claims 1 to 8, wherein the lid has a projection that protrudes upward from the lid body around the intake passage of the cylindrical portion.

10. The cover body is attached to the lid so as to cover the intake passage and has an intake hole formed therein that communicates with the intake passage. The lid according to claim 9, wherein the projection is covered by the cover body.

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