Well lid methane exhaust structure and its inspection well lid

Abstract

This utility model discloses a biogas venting structure for a manhole cover and the manhole cover thereof. The biogas venting structure includes: a manhole cover with a venting chamber at its center, a venting hole on its top surface, and an inlet hole on its bottom surface; and a sealing ball, which is vertically slidably disposed within the venting chamber. The diameter of the venting chamber is larger than the diameter of the sealing ball, while the diameters of the venting hole and the inlet hole are smaller than the diameter of the sealing ball. This utility model reduces the risk of the manhole cover being blown off due to an explosion caused by biogas in the manhole encountering an open flame or spark, thus ensuring the safety of the manhole cover.

Description

Technical Field

[0001] This utility model relates to the field of manhole covers, specifically to a manhole cover biogas exhaust structure and the manhole cover thereof. Background Technology

[0002] Due to their long-term enclosed state and the presence of organic matter, manholes can produce biogas, especially in sewage and rainwater manholes. When ventilation is poor or the manhole is blocked, biogas gradually accumulates, increasing its concentration and pressure. This can lead to an explosion upon contact with an open flame or spark, causing the manhole cover to be blown off, posing a significant safety hazard.

[0003] Existing manhole covers usually have ventilation holes to allow the gas inside the manhole to be discharged into the surrounding environment. However, the gas inside the manhole has an odor due to the decomposition of organic matter under anaerobic conditions, producing gases such as hydrogen sulfide and methane. This can cause olfactory discomfort to pedestrians passing by or lingering near the manhole cover, especially in hot weather or in poorly ventilated alleyways. Utility Model Content

[0004] The purpose of this utility model is to provide a manhole cover biogas venting structure and manhole cover, which can reduce the risk of explosion caused by biogas in the manhole encountering an open flame or spark, thus ensuring the safety of manhole cover use.

[0005] The technical solution adopted by this utility model to solve the above problems is: The biogas venting structure for the manhole cover includes: The manhole cover has an exhaust chamber in its center, an exhaust hole on its top surface, and an air inlet on its bottom surface. A closed ball, which is vertically slidably disposed within the exhaust chamber; The diameter of the exhaust chamber is larger than the diameter of the closed sphere, while the diameters of the exhaust port and the air inlet are smaller than the diameter of the closed sphere.

[0006] As a further improvement to the above technical solution, there are two vent holes, which are arranged at equal angles around the central axis of the manhole cover.

[0007] As a further improvement to the above technical solution, the bottom end of the exhaust chamber is funnel-shaped.

[0008] This utility model also provides a manhole cover, comprising: The mounting base is used to be embedded in the road surface. The mounting base is a hollow structure with openings at both ends. The manhole cover has the same structure as the biogas exhaust structure of the manhole cover described in any of the above technical solutions. The manhole cover is embedded in the opening at the top of the mounting base and the top surfaces of both are on the same horizontal plane.

[0009] As a further improvement to the above technical solution, a number of receiving slots are provided on the top surface of the manhole cover, and adjacent receiving slots are separated by partitions, with the top surface of the partitions being lower than the top surface of the manhole cover.

[0010] As a further improvement to the above technical solution, the bottom surface of the manhole cover is integrally connected with a first reinforcing piece and several second reinforcing pieces. The first reinforcing piece is circular and its central axis is on the same straight line as the central axis of the manhole cover. The second reinforcing pieces are straight and arranged at equal angles around the central axis of the manhole cover. Adjacent second reinforcing pieces are connected by the first reinforcing piece.

[0011] As a further improvement to the above technical solution, an extension ring for supporting the manhole cover is integrally connected to the inner edge of the bottom end of the mounting base. The extension ring is provided with support plates that correspond one-to-one with the second reinforcing plates. When the manhole cover is located on the mounting base, the support plates abut against the second reinforcing plates from bottom to top. Any two support plates that are arranged opposite each other are provided with a first connecting hole for the rod of a bolt to pass through. The bottom surface of the manhole cover is provided with a number of mounting plates arranged at equal angles around its central axis. The number of support plates and mounting plates is even. The mounting plates are provided with a second connecting hole that corresponds to the first connecting hole.

[0012] As a further improvement to the above technical solution, an annular extension piece is sleeved and integrally connected to the bottom end of the mounting base. The bottom surface of the extension piece is on the same horizontal plane as the bottom surface of the mounting base. Several first grooves are opened on the top surface of the extension piece at equal angles around its central axis, and a second groove is opened on its bottom surface. Several through holes are opened in the first groove, and the first groove communicates with the second groove through the through holes.

[0013] As a further improvement to the above technical solution, a number of triangular connecting pieces are provided between adjacent first grooves, and the two straight ends of the connecting pieces are integrally connected to the top surface of the extension piece and the side surface of the mounting base, respectively.

[0014] As a further improvement to the above technical solution, U-shaped lifting holes are provided at two opposite positions on the manhole cover.

[0015] Compared with the prior art, this utility model has the following advantages and effects: This invention, through the design of an exhaust structure on the manhole cover, enables the release of biogas when it accumulates in the manhole and reaches a certain level, leading to increased pressure. This reduces the amount of biogas in the manhole, thereby decreasing the biogas concentration and lowering the risk of the manhole cover being blown off due to an explosion caused by the biogas encountering an open flame or spark. This ensures the safety of the manhole cover. At the same time, since the exhaust structure is normally in a closed state, it reduces the risk of odors emanating from the manhole and causing olfactory discomfort to pedestrians passing by or lingering near the manhole cover. Attached Figure Description

[0016] Figure 1 This is a structural schematic diagram of a manhole cover according to this utility model.

[0017] Figure 2 This is a schematic cross-sectional view of a partial longitudinal structure of a manhole cover according to this utility model.

[0018] Figure 3 yes Figure 1 The diagram shows the structure of the manhole cover from one perspective.

[0019] Figure 4 yes Figure 1 The diagram shows the structure of the manhole cover from the second perspective.

[0020] Figure 5 yes Figure 1 The diagram shows the structure of the mounting base from one perspective.

[0021] Figure 6 yes Figure 1 The diagram shows the structure of the mounting base from view two.

[0022] Figure 7 This is a partial structural schematic diagram of a manhole cover according to this utility model.

[0023] The components include: mounting base 1, manhole cover 2, lifting hole 21, exhaust chamber 31, exhaust hole 32, air inlet hole 33, sealing ball 4, receiving groove 5, partition 51, first reinforcing plate 61, second reinforcing plate 62, connecting strip 63, extension plate 7, first groove 71, second groove 72, through hole 73, connecting plate 8, extension ring 91, support plate 92, first connecting hole 93, mounting plate 94, and second connecting hole 95. Detailed Implementation

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and through embodiments. The following embodiments are explanations of the present invention, but the present invention is not limited to the following embodiments.

[0025] See Figures 1-7This embodiment of a manhole cover includes a mounting base 1 and a manhole cover 2 for embedding in the road surface. The mounting base 1 is a hollow structure with openings at both ends. The manhole cover 2 is embedded in and covers the opening at the top of the mounting base 1, and the top surfaces of both are on the same horizontal plane. An exhaust chamber 31 is provided at the center of the manhole cover 2. A sealing ball 4 is vertically slidably disposed in the exhaust chamber 31. The diameter of the exhaust chamber 31 is larger than the diameter of the sealing ball 4. An exhaust hole 32 is provided on the top surface of the manhole cover 2, and an air inlet hole 33 is provided on its bottom surface. The diameters of the exhaust hole 32 and the air inlet hole 33 are both smaller than the diameter of the sealing ball 4.

[0026] Under normal conditions, the sealing ball 4, under the influence of gravity, presses against the air inlet 33 from top to bottom, preventing gas (such as biogas) in the manhole from escaping from the manhole cover 2. When the manhole is poorly ventilated or blocked, biogas accumulates and increases, increasing the pressure inside the manhole. This drives the sealing ball 4 to move vertically upward along the exhaust chamber 31, opening the air inlet 33. This allows gas in the manhole to enter the exhaust chamber 31 through the air inlet 33 and exit from the exhaust port 32, reducing the amount of gas in the manhole. This reduces the pressure and biogas concentration inside the manhole, lowering the risk of the manhole cover 2 being lifted due to an explosion caused by biogas encountering an open flame or spark. This improves the safety of the manhole cover. When the pressure inside the manhole drops to a certain level, the drive on the sealing ball 4 is released, allowing the sealing ball 4 to resume sealing the air inlet 33.

[0027] In this embodiment, the bottom of the exhaust chamber 31 is funnel-shaped, which can guide the sealing ball 4 to block the air inlet 33. There are two exhaust holes 32, which are arranged at equal angles around the central axis of the manhole cover 2 to ensure exhaust effect and efficiency.

[0028] See Figure 2 , Figure 3 The manhole cover 2 has two U-shaped lifting holes 21 at two opposite positions, which makes it convenient for workers to move the manhole cover 2 to the bottom of the mounting base 1 by lifting and put it into the mounting base 1, thus improving the convenience of installation.

[0029] See Figure 3 The top surface of the manhole cover 2 is provided with several receiving slots 5. Adjacent receiving slots 5 are separated by partitions 51. The top surface of the partitions 51 is lower than the top surface of the manhole cover 2, so that the paving material can be filled into the receiving slots 5, thereby improving the concealment effect of the manhole cover 2 on the road surface.

[0030] See Figure 4The bottom surface of the manhole cover 2 is integrally connected with a first reinforcing piece 61 and several second reinforcing pieces 62. The first reinforcing piece 61 is circular and its central axis is on the same straight line as the central axis of the manhole cover 2. The second reinforcing pieces 62 are straight and arranged at equal angles around the central axis of the manhole cover 2. Adjacent second reinforcing pieces 62 are connected by the first reinforcing piece 61, which enhances the structural strength of the bottom surface of the manhole cover 2, thereby improving the load-bearing capacity of the bottom surface of the manhole cover 2 and ensuring the structural stability of the manhole cover 2 hidden in the road surface.

[0031] In this embodiment, a connecting strip 63 is provided between adjacent second reinforcing pieces 62. The side of the first reinforcing piece 61 and the manhole cover 2 are connected by the connecting strip 63. Each connecting strip 63 is arranged at an equal angle around the central axis of the manhole cover 2.

[0032] See Figures 5-7 An annular extension piece 7 is sleeved and integrally connected to the bottom end of the mounting base 1. The bottom surface of the extension piece 7 is on the same horizontal plane as the bottom surface of the mounting base 1. Several first grooves 71 are opened on the top surface of the extension piece 7 at equal angles around its central axis, and a second groove 72 is opened on its bottom surface. Several through holes 73 are opened in the first grooves 71. The first grooves 71 are connected to the second grooves 72 through the through holes 73, which enhances the embedment degree of the extension piece 7 in the road surface and provides the road surface with the strength to limit the displacement of the extension piece 7, thereby ensuring the stability of the installation position of the mounting base 1 on the road surface.

[0033] See Figure 5 Several triangular connecting pieces 8 are provided between adjacent first grooves 71. The two straight ends of the connecting pieces 8 are integrally connected to the top surface of the extension piece 7 and the side surface of the mounting base 1, respectively, which improves the structural strength between the extension piece 7 and the mounting base 1, thereby ensuring the effect of the extension piece 7 in preventing the mounting base 1 from detaching from the road surface.

[0034] See Figure 6 , Figure 7An extension ring 91 for supporting the manhole cover 2 is integrally connected to the inner edge of the bottom end of the mounting base 1. The extension ring 91 is provided with support pieces 92 that correspond one-to-one with the second reinforcing piece 62. When the manhole cover 2 is located on the mounting base 1, the support pieces 92 abut against the second reinforcing piece 62 from bottom to top. Any two support pieces 92 that are arranged opposite each other are provided with a first connecting hole 93 for the rod of the bolt to pass through. The bottom surface of the manhole cover 2 is provided with a number of mounting pieces 94 arranged at equal angles around its central axis. The number of support pieces 92 and mounting pieces 94 is even. The mounting pieces 94 are provided with a second connecting hole 95 that corresponds to the first connecting hole 93, so that the support pieces 92 and the mounting pieces 94 can be connected by bolts, thereby achieving the purpose of fixing the manhole cover 2 to the mounting base 1, increasing the difficulty of detaching the manhole cover 2 from the mounting base 1, and ensuring the safety of the manhole cover.

[0035] The above description in this specification is merely illustrative of the present invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, as long as they do not depart from the content of this specification or exceed the scope defined in the claims, all of which shall fall within the protection scope of this invention.

Claims

1. A biogas exhaust structure for manhole covers, characterized in that, include: The manhole cover has an exhaust chamber in its center, an exhaust hole on its top surface, and an air inlet on its bottom surface. A closed ball, which is vertically slidably disposed within the exhaust chamber; The diameter of the exhaust chamber is larger than the diameter of the closed sphere, while the diameters of the exhaust port and the air inlet are smaller than the diameter of the closed sphere.

2. The manhole cover biogas exhaust structure according to claim 1, characterized in that: There are two vent holes, which are arranged at equal angles around the central axis of the manhole cover.

3. The manhole cover biogas exhaust structure according to claim 1, characterized in that: The bottom of the exhaust chamber is funnel-shaped.

4. A manhole cover, characterized in that, include: The mounting base is used to be embedded in the road surface. The mounting base is a hollow structure with openings at both ends. The manhole cover has the same structure as the biogas exhaust structure of the manhole cover according to any one of claims 1-3, wherein the manhole cover is embedded in the opening at the top of the mounting base and the top surfaces of both are on the same horizontal plane.

5. The manhole cover according to claim 4, characterized in that: The top surface of the manhole cover has several receiving slots, and adjacent receiving slots are separated by partitions. The top surface of the partitions is lower than the top surface of the manhole cover.

6. The manhole cover according to claim 4 or 5, characterized in that: The bottom surface of the manhole cover is integrally connected with a first reinforcing piece and several second reinforcing pieces. The first reinforcing piece is circular and its central axis is on the same straight line as the central axis of the manhole cover. The second reinforcing pieces are straight and arranged at equal angles around the central axis of the manhole cover. Adjacent second reinforcing pieces are connected by the first reinforcing piece.

7. The manhole cover according to claim 6, characterized in that: An extension ring for supporting the manhole cover is integrally connected to the inner edge of the bottom end of the mounting base. The extension ring is provided with support plates that correspond one-to-one with the second reinforcing plates. When the manhole cover is located on the mounting base, the support plates abut against the second reinforcing plates from bottom to top. Any two support plates that are arranged opposite each other are provided with a first connecting hole for the rod of a bolt to pass through. The bottom surface of the manhole cover is provided with a number of mounting plates arranged at equal angles around its central axis. The number of support plates and mounting plates is even. The mounting plates are provided with a second connecting hole that corresponds to the first connecting hole.

8. The manhole cover according to claim 4, characterized in that: An annular extension piece is sleeved and integrally connected to the bottom end of the mounting base. The bottom surface of the extension piece is on the same horizontal plane as the bottom surface of the mounting base. Several first grooves are opened on the top surface of the extension piece at equal angles around its central axis, and a second groove is opened on its bottom surface. Several through holes are opened in the first groove, and the first groove communicates with the second groove through the through holes.

9. The manhole cover according to claim 8, characterized in that: Several triangular connecting pieces are provided between adjacent first grooves, and the two straight ends of the connecting pieces are integrally connected to the top surface of the extension piece and the side surface of the mounting base, respectively.

10. The manhole cover according to claim 4, characterized in that: The manhole cover has two U-shaped lifting holes at opposite positions.

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