Water seal manhole cover

Abstract

The utility model relates to a water seal manhole cover belongs to manhole cover technical field. Including the manhole straight section of welding in the original manhole mouth upper end, the lateral wall of manhole straight section is welded with the vertical edge annular disc, the vertical edge annular disc includes horizontal ring and annular ring no.

Description

Technical Field

[0001] This utility model relates to the field of manhole cover technology, and in particular to a water-sealed manhole cover. Background Technology

[0002] After being sealed, the pressure of an atmospheric pressure storage tank typically fluctuates between -500 and +5000 Pa. To maintain normal pressure within the tank, a breather valve is usually installed. However, breather valves require a clean gas environment to operate. In actual production, most VOC gases in storage tanks contain impurities. These impurities can cause the valve plate to adhere to the valve body, leading to valve failure and affecting the safe use of the storage tank.

[0003] To address the issue of breather valve failure, the common approach is to directly open the manhole cover. However, the manhole cover is heavy and difficult to move manually. Furthermore, once opened, the inside and outside of the tank are completely connected, allowing a large influx of outside air into the tank and potentially posing unnecessary safety risks. Summary of the Invention

[0004] To solve the above-mentioned technical problems, this utility model provides a water-sealed manhole cover. The technical solution of this utility model is as follows: A water-sealed manhole cover includes a straight manhole section welded to the upper end of the original manhole opening. A vertically edged annular disc is welded to the outer wall of the straight manhole section. The vertically edged annular disc includes a horizontal ring and an annular ring I. The horizontal ring is welded to the outer wall of the straight manhole section, and the annular ring I is vertically welded to the outer edge of the upper surface of the horizontal ring. The horizontal ring, the annular ring I, and the outer wall of the straight manhole section together form a water-sealed groove for containing water. The upper edge of the annular ring I is higher than the upper edge of the straight manhole section. The upper end of the first annular ring is detachably connected to a top cover. The upper surface of the top cover has multiple sets of vent holes. A water seal cover is provided below the top cover and inside the first annular ring. The water seal cover includes a movable cover and a second annular ring vertically welded to the outer edge of its lower surface. The lower end of the second annular ring is inserted into the water seal groove, and a bottom pressure relief gap is left between the lower end face of the second annular ring and the inner bottom wall of the water seal groove. An adjustment component for adjusting the vertical height of the water seal cover relative to the water seal groove is connected to the top cover.

[0005] Optionally, the outer side wall of the annular ring is uniformly fixed with multiple sets of fixing ear plates along the circumference, and the outer side wall of the top cover is uniformly fixed with multiple sets of ear seats with the same number as the fixing ear plates along the circumference. A short stud is fixedly connected to the lower surface of the ear seat, and the end of the short stud passes through the ear seat at the corresponding position and is threaded with a fixing nut. The fixing nut abuts against the lower surface of the ear seat.

[0006] Optionally, the lower surface of the movable cover is welded with a cross-shaped reinforcing rib.

[0007] Optionally, the adjusting assembly includes a long threaded rod, the lower end of which is fixedly connected to the center of the upper surface of the movable cover, the upper end of which is threaded through the center of the top cover and extends to the top of the top cover, and an adjusting handwheel is fixedly connected to the upper end of the long threaded rod.

[0008] Optionally, the adjustment assembly includes an adjustment stud and a sleeve. The adjustment stud is fixedly connected to the center of the lower surface of the top cover, and the sleeve is fixedly connected to the center of the upper surface of the movable cover. The sleeve is threaded onto the outside of the adjustment stud.

[0009] Optionally, each set of vent holes is fixedly connected to an upwardly extending connecting pipe at its upper end, and each set of connecting pipes is detachably connected to a sealing cap at its upper end.

[0010] All of the above optional technical solutions can be combined arbitrarily, and this utility model does not provide a detailed description of the structure after each combination.

[0011] The beneficial effects of this utility model through the above solution are as follows: 1. This utility model, by incorporating a water seal groove and a water seal cover, can automatically adjust the internal pressure of the storage tank without opening the manhole cover. This serves as a reliable backup safety measure in case the breather valve fails due to impurities, significantly increasing the tank's reliability. It also prevents large-scale intrusion of outside air into the tank after opening the manhole cover. When overpressure or negative pressure occurs inside the tank, gas can be automatically released or drawn in by breaking the water seal. Once the pressure returns to normal, the seal is automatically restored without manual intervention. This effectively avoids safety risks caused by breather valve failure or delayed manual handling, greatly enhancing the tank's safety.

[0012] 2. By setting up adjustment components, dual adjustment of the insertion depth of the second annular ring and the bottom pressure relief gap is achieved. This allows the device to flexibly adjust the vertical height of the water seal cover relative to the water seal groove (i.e., the bottom pressure relief gap between the lower edge of the second annular ring and the bottom wall of the water seal groove) and the insertion depth of the second annular ring into the water seal groove (i.e., the water seal depth) according to the pressure discharge and suction conditions of the stored medium in the storage tank when production conditions change or the stored medium is replaced, thereby greatly enhancing the applicability of the device.

[0013] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0014] Figure 1This is a schematic diagram of the overall appearance structure of the water seal manhole cover provided in Embodiment 1 of this utility model; Figure 2 This is a front sectional view of the water-sealed manhole cover provided in Embodiment 1 of this utility model; Figure 3 This is an exploded view of the water-sealed manhole cover provided in Embodiment 1 of this utility model. Figure 1 ; Figure 4 This is an exploded view of the water-sealed manhole cover provided in Embodiment 1 of this utility model. Figure 2 ; Figure 5 This is a schematic diagram of the overall appearance structure of the water seal manhole cover provided in Embodiment 2 of this utility model; Figure 6 This is a front sectional view of the water-sealed manhole cover provided in Embodiment 2 of this utility model; Figure 7 This is an exploded view of the water-sealed manhole cover provided in Embodiment 2 of this utility model. Figure 1 ; Figure 8 This is an exploded view of the water-sealed manhole cover provided in Embodiment 2 of this utility model. Figure 2 .

[0015] The diagram is labeled as follows: 1. Original manhole opening; 2. Straight section of manhole; 3. Vertical annular disc; 31. Horizontal ring; 32. Annular ring one; 33. Water seal groove; 34. Fixed ear plate; 4. Top cover; 41. Vent hole; 42. Ear seat; 43. Short stud; 44. Fixed nut; 5. Water seal cover; 51. Movable cover; 52. Annular ring two; 53. Cross reinforcing rib; 6. Adjustment assembly; 61. Long threaded rod; 62. Adjustment handwheel; 63. Adjustment stud; 64. Sleeve; 7. Connecting pipe; 8. Sealing cover. Detailed Implementation

[0016] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0017] Example 1, please refer to Figure 1-4This utility model provides a water-sealed manhole cover, including a straight manhole section 2 welded to the upper end of the original manhole opening 1. A vertical annular disc 3 is welded to the outer wall of the straight manhole section 2. The vertical annular disc 3 includes a horizontal ring 31 and an annular ring 32. The horizontal ring 31 is welded to the outer wall of the straight manhole section 2, and the annular ring 32 is vertically welded to the outer edge of the upper surface of the horizontal ring 31. The horizontal ring 31, the annular ring 32, and the outer wall of the straight manhole section 2 together form a water-sealed groove 33 for containing water. The upper edge of the annular ring 32 is higher than the upper edge of the straight manhole section 2. The top end of the annular ring 32 is detachably connected to a top cover 4. The upper surface of the top cover 4 has multiple sets of vent holes 41. A water seal cover 5 is provided below the top cover 4 and inside the annular ring 32. The water seal cover 5 includes a movable cover 51 and an annular ring 52 vertically welded to the outer edge of its lower surface. The lower end of the annular ring 52 is inserted into the water seal groove 33, and a bottom pressure relief gap is left between the lower end face of the annular ring 52 and the inner bottom wall of the water seal groove 33. An adjustment component 6 is connected to the top cover 4 to adjust the vertical height of the water seal cover 5 relative to the water seal groove 33.

[0018] This invention, by incorporating a water seal groove 33 and a water seal cover 5, allows for automatic adjustment of the internal pressure of the storage tank without opening the manhole cover. This provides a reliable backup safety measure in case the breather valve fails due to impurities, significantly increasing the tank's reliability. It also effectively prevents large-scale intrusion of outside air into the tank after opening the manhole cover. Specifically, when the tank is under positive pressure, and the pressure rises above the water seal resistance, the pressure breaks through the water seal in the water seal groove 33 and is released to the outside through the vent hole 41 on the top cover 4, achieving positive pressure release. When the tank is under negative pressure, and the pressure decreases, outside air enters the tank through the vent hole 41 on the top cover 4, breaking through the water seal in the water seal groove 33, achieving negative pressure intake. When the pressure returns to normal, a water seal automatically forms again, ensuring the tank pressure remains within a safe range.

[0019] By setting the adjustment component 6, dual adjustment of the insertion depth of the second annular ring 52 and the bottom pressure relief gap is achieved. This allows the device to flexibly adjust the vertical height of the water seal cover 5 relative to the water seal groove 33 (i.e., the bottom pressure relief gap between the lower edge of the second annular ring 52 and the inner bottom wall of the water seal groove 33) and the insertion depth of the second annular ring 52 into the water seal groove 33 (i.e., the water seal depth) according to the pressure discharge and suction conditions required by the stored medium in the storage tank when the production conditions change or the stored medium is replaced, thereby greatly enhancing the applicability of the device.

[0020] Specifically, first, an appropriate amount of water is injected into the water seal trough 33. Then, the relative position of the water seal cover 5 below the top cover 4 is adjusted by adjusting the component 6. After the adjustment is completed, the top cover 4 is fastened to the upper end of the annular ring 32 and the two are fixed. At this time, the annular ring 52 in the water seal cover 5 is inserted into the water seal trough 33 to a certain depth, and the space between the inner wall of the annular ring 52 and the outer wall of the manhole straight section 2 is connected to the inside of the storage tank, while the space between the outer wall of the annular ring 52 and the inner wall of the annular ring 32 is connected to the outside of the storage tank.

[0021] Specifically, the upper edge of the annular ring 32 is higher than the upper edge of the manhole straight section 2, which ensures that the condensate formed flows back into the water seal groove 33.

[0022] Furthermore, multiple sets of fixing ear plates 34 are uniformly fixed along the circumference of the outer side wall of the annular ring 32, and multiple sets of ear seats 42 with the same number as the fixing ear plates 34 are uniformly fixed along the circumference of the outer side wall of the top cover 4. A short stud 43 is fixedly connected to the lower surface of the ear seat 42. The end of the short stud 43 passes through the ear seat 42 at the corresponding position and is threaded with a fixing nut 44. The fixing nut 44 abuts against the lower surface of the ear seat 42.

[0023] Specifically, when installing the top cover 4 onto the upper end of the annular ring 32, the short studs 43 on the outer side of the top cover 4 need to be inserted into the corresponding lugs 42 and secured with the fixing nuts 44. At this time, the water seal cover 5 is suspended above the manhole straight section 2 under the action of the top cover 4, thus forming a stable water seal structure.

[0024] Furthermore, a cross-shaped reinforcing rib 53 is welded to the lower surface of the movable cover 51, which can effectively prevent the movable cover 51 from deforming.

[0025] Furthermore, the adjustment assembly 6 includes a long threaded rod 61, the lower end of which is fixedly connected to the center of the upper surface of the movable cover 51, the upper end of which is threaded through the center of the top cover 4 and extends to the top of the top cover 4, and an adjustment handwheel 62 is fixedly connected to the upper end of the long threaded rod 61.

[0026] Specifically, the upper end of the long threaded rod 61 penetrates the top cover 4, which allows the height of the water seal cover 5 to be adjusted without removing the top cover 4, simplifying the adjustment process. During adjustment, simply turn the adjusting handwheel 62 manually. The adjusting handwheel 62 will drive the long threaded rod 61 to rotate. With the threaded engagement between the long threaded rod 61 and the top cover 4, the movable cover 51 will move up and down, thereby indirectly changing the relative height between the lower edge of the annular ring 2 52 and the inner bottom wall of the water seal groove 33.

[0027] Example 2, please refer to Figure 5-8In another embodiment of the present invention, the adjusting component 6 includes an adjusting stud 63 and a sleeve 64. The adjusting stud 63 is fixedly connected to the center position of the lower surface of the top cover 4, and the sleeve 64 is fixedly connected to the center position of the upper surface of the movable cover 51. The sleeve 64 is threaded onto the outside of the adjusting stud 63.

[0028] Specifically, this embodiment facilitates temporary sealing of the top cover 4 by installing the adjusting component 6 in the cavity between the top cover 4 and the water seal cover 5. During adjustment, the overall height of the sleeve 64 and the adjusting stud 63 can be changed by manually adjusting the relative position of the adjusting stud 63 on the upper end of the sleeve 64, thereby indirectly changing the relative position between the water seal cover 5 and the top cover 4.

[0029] Furthermore, each set of vent holes 41 is fixedly connected to an upwardly extending connecting pipe 7 at its upper end, and each set of connecting pipes 7 is detachably connected to a sealing cap 8 at its upper end.

[0030] Specifically, when sealing of the manhole straight section 2 is required during certain production stages, the sealing cap 8 can be installed on the upper end of each set of connecting pipes 7 and tightened, at which point the manhole straight section 2 is in a sealed environment. To achieve a reliable seal, a flange connection is used between the connecting pipe 7 and the sealing cap 8, with a sealing ring sandwiched between them. Simultaneously, a sealing ring can also be installed at the contact point between the lower surface of the top cover 4 and the upper edge of the annular ring 52, thus forming multiple sealing protections.

[0031] The above are merely preferred embodiments of this utility model and are not intended to limit this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A water-sealed manhole cover, characterized in that: The manhole includes a straight section (2) welded to the upper end of the original manhole opening (1). A vertically edged annular disc (3) is welded to the outer wall of the straight section (2). The vertically edged annular disc (3) includes a horizontal ring (31) and an annular ring (32). The horizontal ring (31) is welded to the outer wall of the straight section (2), and the annular ring (32) is vertically welded to the outer edge of the upper surface of the horizontal ring (31). The horizontal ring (31), the annular ring (32), and the outer wall of the straight section (2) together form a water seal groove (33) for containing water. The upper edge of the annular ring (32) is higher than the upper edge of the straight section (2). The top end of 32) is detachably connected to a top cover (4). The top cover (4) has multiple sets of vent holes (41) on its upper surface. A water seal cover (5) is provided below the top cover (4) and inside the annular ring one (32). The water seal cover (5) includes a movable cover (51) and an annular ring two (52) vertically welded to the outer edge of its lower surface. The lower end of the annular ring two (52) is inserted into the water seal groove (33), and a bottom pressure relief gap is left between the lower end face of the annular ring two (52) and the inner bottom wall of the water seal groove (33). An adjustment component (6) for adjusting the vertical height of the water seal cover (5) relative to the water seal groove (33) is connected to the top cover (4).

2. The water-sealed manhole cover according to claim 1, characterized in that, The outer wall of the annular ring (32) is uniformly fixed with multiple sets of fixing ear plates (34) along the circumference. The outer wall of the top cover (4) is uniformly fixed with multiple sets of ear seats (42) with the same number as the fixing ear plates (34) along the circumference. The lower surface of the ear seat (42) is fixedly connected with a short stud (43). The end of the short stud (43) passes through the ear seat (42) at the corresponding position and is threaded with a fixing nut (44). The fixing nut (44) abuts against the lower surface of the ear seat (42).

3. A water-sealed manhole cover according to claim 1, characterized in that, The lower surface of the movable cover (51) is welded with a cross-shaped reinforcing rib (53).

4. A water-sealed manhole cover according to any one of claims 1 to 3, characterized in that, The adjustment assembly (6) includes a long threaded rod (61), the lower end of which is fixedly connected to the center of the upper surface of the movable cover (51), the upper end of which is threaded through the center of the top cover (4) and extends to the top of the top cover (4), and the upper end of which is fixedly connected to an adjustment handwheel (62).

5. A water-sealed manhole cover according to any one of claims 1 to 3, characterized in that, The adjustment assembly (6) includes an adjustment stud (63) and a sleeve (64). The adjustment stud (63) is fixedly connected to the center of the lower surface of the top cover (4), and the sleeve (64) is fixedly connected to the center of the upper surface of the movable cover (51). The sleeve (64) is threaded onto the outside of the adjustment stud (63).

6. A water-sealed manhole cover according to claim 5, characterized in that, Each set of vent holes (41) is fixedly connected to an upwardly extending connecting pipe (7) at its upper end, and each set of connecting pipes (7) is detachably connected to a sealing cap (8) at its upper end.

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