Novel pressure relief manhole with valve disc free of guide structure

Abstract

The utility model discloses a novel pressure relief manhole with a valve disc free of a guide structure, and relates to the technical field of pressure relief manholes. The novel pressure relief manhole comprises a valve body, a valve disc, a balance weight disc and a rainproof cover, and the valve disc is in a circular truncated cone shape and is arranged on a valve seat of the valve body; the position change of separation or contact between the valve disc and the valve seat is realized under the action of external force; the balance weight disc is arranged on the valve disc, and the rainproof cover is located above the valve disc and detachably connected with the valve body. According to the utility model, the opening height of the valve disc can be obviously increased by utilizing the circular-truncated-cone-shaped valve disc, so that the ventilation capacity is increased, and the valve disc can be matched with the valve seat to realize guiding only by utilizing the structural characteristic that the valve disc is provided with an inclined surface without using an additional guiding structure, so that the valve disc can smoothly fall back, and the problem of disc clamping is avoided.

Description

Technical Field

[0001] This utility model relates to the field of pressure relief manhole technology, and in particular to a novel pressure relief manhole with a valve disc without a guide structure. Background Technology

[0002] Pressure relief manholes are safety emergency ventilation devices installed on petrochemical and other equipment and storage tanks. They are usually used in conjunction with breather valves installed on the top of the tank to maintain normal pressure inside the tank and prevent accidents caused by sudden overpressure inside the tank due to unexpected reasons.

[0003] Chinese patent document CN215795984U discloses a novel pressure relief manhole, including a flat-welded flange and a pressure relief cylinder. The flat-welded flange is installed at the lower end of the pressure relief cylinder. Three small square plates are equidistantly arranged on the circular outer wall of the pressure relief cylinder near the middle position. A custom flange is provided at the upper end of the pressure relief cylinder, and a sealing ring is provided on the upper outer wall of the custom flange. A venting blind plate is provided above the sealing ring. However, this document has two problems. First, the valve disc adopts a flat valve disc structure, which causes a rapid pressure drop at the outlet of the pressure relief manhole, resulting in insufficient valve disc opening height and reduced airflow. Second, the guide rod structure on the valve disc is prone to jamming during valve disc movement. Utility Model Content

[0004] In view of the problems of low opening height, low ventilation volume, and easy jamming of the existing pressure relief manholes, this utility model discloses a novel pressure relief manhole with a valve disc without a guide structure.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A novel pressure relief manhole with a non-guided valve disc includes a valve body and a valve disc. The valve body includes a valve seat and a rain cover. The valve disc is an inverted frustum shape and is inserted into the valve seat. Under external force, the valve disc can change position to separate from or contact the valve seat. A counterweight is disposed on the valve disc, and the rain cover covers the valve disc.

[0007] Furthermore, the top of the valve disc has an outwardly extending flange that contacts the top of the valve seat; the bottom end face of the valve disc is perpendicular to the axis of the valve seat.

[0008] Furthermore, the valve body also includes a partition net, several support rods, and several lifting lugs. The partition net and several support rods are located outside the valve seat, and each of the lifting lugs is fixedly connected to the valve seat.

[0009] Furthermore, the mesh is annular and has several through holes. The mesh is sleeved on the outer wall of the valve seat, and the inner edge of the mesh contacts the outer wall of the valve seat.

[0010] Furthermore, the inner edge of the mesh is fixedly connected to the outer wall of the valve seat; the bottom of the rain cover is in contact with the mesh.

[0011] Furthermore, the bottom of the support rod is fixed to the lifting lug, each support rod is adapted to pass through the mesh and is connected to the rain cover by bolts.

[0012] Furthermore, each of the support rods is evenly arranged along the circumference of the valve seat.

[0013] Furthermore, each of the aforementioned lifting lugs is L-shaped, and each of the aforementioned lifting lugs has a lifting hole at its upper part.

[0014] Furthermore, a flange is fixedly connected to the bottom of the valve seat.

[0015] Furthermore, the valve disc is approximately a conical barrel, with a fixed rod protruding upward from the inner bottom of the valve disc, and the counterweight disc is sleeved on the fixed rod and detachably connected to the fixed rod.

[0016] The beneficial effects of this utility model are: This utility model utilizes a frustum-shaped valve disc, which can significantly increase the opening height of the valve disc, thereby increasing the air volume. Furthermore, the valve disc does not require an additional guide structure; it can be guided by its own inclined surface structure to cooperate with the valve seat, allowing the valve disc to fall smoothly and avoiding jamming problems. Attached Figure Description

[0017] Figure 1 The diagram shown is a schematic diagram of the structural principle of one embodiment of this utility model.

[0018] Figure 2 The above is Figure 1 Top view.

[0019] Figure 3 As shown Figure 2 Sectional view at point A in the middle.

[0020] Figure 4 As shown Figure 3 A side view.

[0021] Explanation of reference numerals in the attached diagram: 1. Valve seat; 2. Valve disc; 3. Counterweight disc; 4. Rain cover; 5. Partition net; 6. Support rod; 7. Lifting lug; 8. Flange. Detailed Implementation

[0022] This utility model discloses a novel pressure relief manhole with a valve disc without a guide structure. The following describes one embodiment of this utility model in detail with reference to the accompanying drawings.

[0023] Combination Figure 1 and Figure 2 As shown, the novel pressure relief manhole with a guideless valve disc structure includes a valve body, a valve disc 2, a counterweight disc 3, and a rain cover 4. The valve body includes a valve seat 1, a mesh 5, several support rods 6, and several lifting lugs 7. The valve seat 1 is a hollow tube with a flange 8 fixedly connected to its bottom. The valve disc 2 is located at the opening at the top of the valve seat 1. The valve disc 2 is approximately a conical barrel with an opening at the top and its bottom end face perpendicular to the axis of the valve seat 1. The top of the valve disc 2 has an outwardly extending flange that contacts the top of the valve seat 1. The inner bottom of the valve disc 2 has an upwardly protruding fixing rod. The counterweight disc 3 has a mounting hole that matches the fixing rod, and the counterweight disc 3 is fitted onto the fixing rod through the mounting hole. The top of the fixing rod has an external thread, and the fixing rod secures the counterweight disc 3 with a nut.

[0024] Combination Figure 3 and Figure 4 As shown, the mesh 5 is annular with several evenly arranged through holes. The mesh 5 is fitted onto the valve seat 1, and its inner edge is fixedly connected to the outer wall of the valve seat 1. Several lifting lugs 7 are L-shaped, and each lug 7 has a lifting hole at its top for easy handling. The lifting lugs 7 are evenly arranged around the circumference of the valve seat 1, and each lug 7 is fixedly connected to the outer wall of the valve seat 1. The number of support rods 6 corresponds to the number of lifting lugs 7, and the bottom of each support rod 6 is fixedly connected to a lifting lug 7. The support rods 6 are fitted with the through holes of the mesh 5, and each support rod 6 passes vertically through the mesh 5. A rain cover 4 is placed over the valve disc 2 and located inside each lifting lug 7, with the bottom end face of the rain cover 4 in contact with the mesh 5. The rain cover 4 has several mounting holes that are compatible with the support rods 6. Each support rod 6 passes through the mounting hole vertically, and each support rod 6 has an external thread on its upper part. The rain cover 4 is fixed by cooperating with the nut.

[0025] In use, the new pressure relief manhole is fixed to the storage tank via flange 8. Because valve disc 2 is an inverted frustum shape, its center is lowered, allowing the bottom surface of valve disc 2 to get closer to the gas inside the storage tank. During pressure relief, the gas first contacts the bottom of valve disc 2, significantly increasing its opening height and thus significantly increasing the ventilation volume. When valve disc 2 falls back, its inclined surface cooperates with valve seat 1 to guide it, facilitating a smooth fall and preventing the valve disc 2 from getting stuck.

[0026] Of course, the above description is not intended to limit the present utility model, and the present utility model is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present utility model should also fall within the protection scope of the present utility model.

Claims

1. A novel pressure relief manhole with a valve disc without a guide structure, characterized in that: The valve includes a valve body and a valve disc (2). The valve body includes a valve seat (1) and a rain cover (4). The valve disc (2) is in the shape of an inverted frustum and is inserted into the valve seat (1). The valve disc (2) can change position to separate from or contact the valve seat (1) under the action of external force. A counterweight disc (3) is arranged on the valve disc (2), and the rain cover (4) covers the valve disc (2).

2. The novel pressure relief manhole with a valve disc without a guide structure according to claim 1, characterized in that: The top of the valve disc (2) has an outwardly extending protrusion that contacts the top of the valve seat (1) through the protrusion; The bottom end face of the valve disc (2) is perpendicular to the axis of the valve seat (1).

3. A novel pressure relief manhole with a valve disc without a guide structure according to claim 1, characterized in that: The valve body also includes a partition net (5), several support rods (6) and several lifting lugs (7). The partition net (5) and several support rods (6) are located outside the valve seat (1), and each of the lifting lugs (7) is fixedly connected to the valve seat (1).

4. A novel pressure relief manhole with a valve disc without a guide structure according to claim 3, characterized in that: The mesh (5) is annular and has several through holes. The mesh (5) is sleeved on the outer wall of the valve seat (1), and the inner edge of the mesh (5) is in contact with the outer wall of the valve seat (1).

5. A novel pressure relief manhole with a valve disc without a guide structure according to claim 4, characterized in that: The inner edge of the partition (5) is fixedly connected to the outer wall of the valve seat (1); the bottom of the rain cover (4) is in contact with the partition (5).

6. A novel pressure relief manhole with a valve disc without a guide structure according to claim 4, characterized in that: The bottom of the support rod (6) is fixed to the lug (7), and each support rod (6) is adapted to pass through the mesh (5) and is connected to the rain cover (4) by bolts.

7. A novel pressure relief manhole with a valve disc without a guide structure according to claim 6, characterized in that: Each of the support rods (6) is evenly arranged along the circumference of the valve seat (1).

8. A novel pressure relief manhole with a valve disc without a guide structure according to claim 3, characterized in that: Each of the aforementioned lifting lugs (7) is L-shaped, and each of the aforementioned lifting lugs (7) has a lifting hole at its upper part.

9. A novel pressure relief manhole with a valve disc without a guide structure according to claim 1, characterized in that: The bottom of the valve seat (1) is fixedly connected to a flange (8).

10. A novel pressure relief manhole with a valve disc without a guide structure according to claim 1, characterized in that: The valve disc (2) is approximately a conical barrel. A fixed rod protrudes upward from the inner bottom of the valve disc (2). The counterweight disc (3) is sleeved on the fixed rod and is detachably connected to the fixed rod.

Images