Manhole cover sealing structure and its manhole cover

Abstract

A manhole cover sealing structure and the same manhole cover are disclosed. The sealing structure includes a manhole frame, a sub-cover plate, and a sealing ring. The manhole frame has a central hole, at least a portion of which is an inverted conical hole with a cross-sectional area gradually decreasing from top to bottom. The inner circumferential surface of the sealing ring has an annular groove extending along its entire circumference, and the outer periphery of the sub-cover plate is embedded in the annular groove. The outer circumferential surface of the sealing ring has multiple layers of annular protrusions spaced along its height, each layer of annular protrusions tilting upwards. These multiple layers of annular protrusions are deformed by the pressure of the inverted conical hole and seal against the hole wall. This invention is easy to implement, has low implementation cost, and provides good sealing performance.

Description

Technical Field

[0001] This utility model relates to manhole covers, and more particularly to sealing technology for manhole covers. Background Technology

[0002] Among the various existing manhole cover sealing structures, some achieve a sealing effect through the tight compression of additional structures, others through the close fit between the cover plate and the manhole frame, and still others by adding sealing measures inside the manhole cover. The solutions mentioned above often require significant investment, high precision in the cover-frame fit, and generally unsatisfactory sealing results. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide a well cover sealing structure and well cover that is easy to implement, has low implementation cost, and has good sealing effect.

[0004] A manhole cover sealing structure according to an embodiment of the present invention includes a manhole frame with a central hole, at least a portion of which is an inverted conical hole with a cross-sectional area that gradually decreases from top to bottom. The manhole cover sealing structure includes a sub-cover plate and a sealing ring. The inner circumferential surface of the sealing ring is provided with an annular groove extending along the entire circumference of the sealing ring, and the outer periphery of the sub-cover plate is embedded in the annular groove. The outer circumferential surface of the sealing ring is provided with multiple layers of annular protrusions spaced along the height direction, each layer of annular protrusions tilting upwards. The multiple layers of annular protrusions are deformed by the pressure of the inverted conical hole and seal against the hole wall of the inverted conical hole.

[0005] This utility model also provides a manhole cover, which includes the aforementioned manhole cover sealing structure.

[0006] This utility model has at least the following advantages:

[0007] 1. In this embodiment of the utility model, the sealing of the manhole cover is achieved by the multi-layer annular protrusions of the sealing ring fitted outside the sub-cover plate tightly adhering to the hole wall of the inverted conical hole. This sealing structure is easy to implement and has a low implementation cost.

[0008] 3. Due to the upward-curving, multi-layered annular protrusions in the shape of petals on the sealing ring of this utility model embodiment, even when there is pressure inside the well and it backflushs against the sub-cover plate, it is difficult for the sub-cover plate to come off the well frame, thus ensuring a good sealing effect. Attached Figure Description

[0009] Figure 1 A top view schematic diagram of a manhole cover sealing structure according to a first embodiment of the present invention is shown.

[0010] Figure 2 It shows Figure 1 AA sectional view.

[0011] Figure 3 It shows Figure 2 A magnified view of part B.

[0012] Figure 4 This diagram shows a partially enlarged view of the sub-cover plate and sealing ring just inserted into the center hole of the well frame according to the first embodiment of the present invention.

[0013] Figure 5 A partially enlarged schematic diagram of the sub-cover plate and sealing ring according to the first embodiment of the present invention is shown.

[0014] Figure 6 A schematic diagram of the sealing ring according to the first embodiment of the present invention is shown.

[0015] Figure 7 A top view schematic diagram of a manhole cover sealing structure according to a second embodiment of the present invention is shown.

[0016] Figure 8 It shows Figure 7 AA sectional view.

[0017] Figure 9 It shows Figure 8 A magnified view of part B.

[0018] Figure 10 A schematic diagram of the sealing ring according to the second embodiment of the present invention is shown. Detailed Implementation

[0019] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0020] Figures 1 to 3 A schematic diagram of the manhole cover sealing structure according to the first embodiment of the present invention is shown below. Please refer to it. Figures 1 to 3 The manhole cover sealing structure according to the first embodiment of this utility model includes a manhole frame 1, a sub-cover plate 2, and a sealing ring 3.

[0021] The well frame 1 has a central hole 10, which is an inverted conical hole with a cross-sectional area that gradually decreases from top to bottom.

[0022] The inner circumferential surface of the sealing ring 3 is provided with an annular groove 31 extending along the entire circumference of the sealing ring 3, and the outer periphery of the sub-cover plate 2 is embedded in the annular groove 31. The outer circumferential surface of the sealing ring 3 is provided with multiple layers of annular protrusions 32 spaced apart along the height direction, each layer of annular protrusions 32 tilting upwards. In the example shown in the figure, the outer circumferential surface of the sealing ring 3 is provided with two layers of annular protrusions 32 spaced apart along the height direction, i.e., the number of annular protrusions 32 is two layers. In other embodiments, the number of annular protrusions 32 may also be three layers, etc.

[0023] Please combine Figure 5 As shown. In this embodiment, the angle A between each layer of annular protrusions 32 and the horizontal plane is 25° to 30°. The angle A between multiple layers of annular protrusions 32 and the horizontal plane can be the same or different. The cross-sectional shape of each layer of annular protrusions 32 is a downwardly curved arc.

[0024] In this embodiment, the sealing ring 3 is a rubber sealing ring, mainly composed of EPDM rubber. The well frame 1 is a casting.

[0025] Please combine Figure 6 As shown. In this embodiment, the cross-sectional shape of the inverted conical hole is rectangular. To match the shape of the inverted conical hole, the outer shape of the sub-cover plate 2 and the outer shape of the sealing ring 3 are both rectangular. A certain gap is maintained between the outer circumferential surface of the sub-cover plate 2 and the inner circumferential surface of the inverted conical hole.

[0026] When the sub-cover plate 2 with sealing ring 3 installed is placed into the inverted conical hole of the well frame 1, the sealing ring 3 will not be under force in the initial state because the gap between the sub-cover plate 2 and the inverted conical hole is large enough. Figure 4 As shown, when the sub-cover plate 2 gradually moves downwards towards the well frame 1, the cross-sectional area of ​​the inverted conical hole gradually decreases from top to bottom due to the draft angle of the casting. Consequently, the gap between the sealing ring 3 and the inverted conical hole also gradually decreases. The multi-layered annular protrusions 32 are compressed and slowly deformed as the gap decreases until they reach a position where they no longer deform. At this point, the multi-layered annular protrusions 32, compressed by pressure, seal against the wall of the inverted conical hole, firmly locking the gap. Simultaneously, due to the upward tilting of the petal-shaped annular protrusions 32 on the sealing ring 3, when there is pressure inside the well pushing against the sub-cover plate 2, it will not easily cause the sub-cover plate 2 to detach from the well frame, thus ensuring a good sealing effect.

[0027] Figures 7 to 10 The second embodiment according to the present invention is shown. The main difference between the second embodiment and the first embodiment is that the central hole 10 of the well frame 1 is not entirely an inverted conical hole, but only a portion 10a of it is an inverted conical hole. The cross-sectional shape of the inverted conical hole, the shape of the sub-cover plate 2, and the shape of the sealing ring 3 are all circular.

[0028] This utility model also provides a manhole cover, which includes the aforementioned manhole cover sealing structure.

[0029] This invention is easy to implement, has low implementation cost, and provides good sealing effect.

[0030] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A manhole cover sealing structure, comprising a manhole frame having a central hole, at least a portion of which is an inverted conical hole, the cross-sectional area of ​​which gradually decreases from top to bottom, characterized in that, The manhole cover sealing structure includes a sub-cover plate and a sealing ring. The inner circumferential surface of the sealing ring is provided with an annular groove extending along the entire circumference of the sealing ring, and the outer circumferential edge of the sub-cover plate is embedded in the annular groove. The outer circumferential surface of the sealing ring is provided with multiple layers of annular protrusions spaced along the height direction. Each layer of annular protrusions is inclined upward. The multiple layers of annular protrusions are deformed by the pressure of the inverted conical hole and seal against the hole wall of the inverted conical hole.

2. The manhole cover sealing structure as described in claim 1, characterized in that, Each layer of annular protrusions has a cross-sectional shape that curves downwards.

3. The manhole cover sealing structure as described in claim 1, characterized in that, The angle between each annular protrusion and the horizontal plane is 25° to 30°.

4. The well cover sealing structure as described in claim 1, characterized in that, The outer circumferential surface of the sealing ring is provided with two layers of annular protrusions spaced apart along the height direction.

5. The well cover sealing structure as described in claim 1, characterized in that, The cross-sectional shape of the inverted conical hole, the shape of the sub-cover plate, and the shape of the sealing ring are all rectangular.

6. The manhole cover sealing structure as described in claim 1, characterized in that, The cross-sectional shape of the inverted conical hole, the shape of the sub-cover plate, and the shape of the sealing ring are all circular.

7. The well cover sealing structure as described in claim 1, characterized in that, The sealing ring is a rubber sealing ring.

8. The manhole cover sealing structure as described in claim 1, characterized in that, The well frame is a casting.

9. A manhole cover, characterized in that, Includes the manhole cover sealing structure as described in any one of claims 1 to 8.

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