Pressure relief manhole capable of adjusting opening degree

Abstract

The utility model relates to the technical field of pressure relief manholes, in particular to an opening-degree-adjustable pressure relief manhole which comprises a shell, a hole cover is arranged at the top end of the shell, a plurality of clamping plates are welded and fixed to the arc outer wall of the hole cover, a plurality of T-shaped rods are installed on the arc outer wall of the shell, and the number of the T-shaped rods is the same as that of the clamping plates. A breather valve with the bottom end communicated into the shell is arranged in the middle of the top face of the hole cover, the breather valve is composed of a pressure release valve serving as a main body and a pressure inlet valve located on the side edge of the pressure release valve, a butterfly valve turning plate is arranged at the position, close to the lower end, in the pressure release valve, and a pressure release pipe is fixedly connected to the position, close to the top face, of the outer wall of the pressure release valve in an inserted mode. And valve discs are slidably clamped in the pressure relief pipe in the pressure relief valve and in the connecting pipe in the pressure inlet valve. The pressure relief manhole with the adjustable opening degree is simple in structure, easy to operate and capable of automatically relieving or feeding pressure.

Description

Technical Field

[0001] This utility model relates to the field of pressure relief manhole technology, and more specifically, to a pressure relief manhole with adjustable opening. Background Technology

[0002] A pressure relief manhole is an emergency ventilation device used to draw in atmospheric air to maintain normal pressure and keep the pressure inside the tank stable when the pressure inside the tank is rapidly reduced or becomes a vacuum.

[0003] Patent 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. A sealing ring is provided on the upper outer wall of the custom flange. A venting blind plate is provided at the upper end of the sealing ring.

[0004] Although this novel pressure relief manhole can automatically seal after pressure relief is completed, preventing external dirt from entering the tank that needs pressure relief and increasing the overall pressure relief effect of the manhole, it cannot adjust the opening degree and cannot allow pressure to enter. Therefore, we propose a pressure relief manhole with an adjustable opening degree. Utility Model Content

[0005] The purpose of this invention is to provide a pressure relief manhole with adjustable opening to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A pressure relief manhole with adjustable opening includes a housing. A cover is hinged to the top of the housing. Several retaining plates are welded and fixed to the arc-shaped outer wall of the cover. Several T-shaped rods, the same number as the retaining plates and corresponding in position, are installed on the arc-shaped outer wall of the housing. A breather valve with its bottom end connected to the housing is fixed to the center of the top surface of the cover by bolts. The breather valve consists of a pressure relief valve as the main body and a pressure inlet valve located on the side of the pressure relief valve. A butterfly valve flap is provided inside the pressure relief valve near the lower end. Several circumferentially distributed pressure relief pipes are fixedly inserted into the outer wall of the pressure relief valve near the top surface. The pressure relief valve and the pressure inlet valve are connected by a connecting pipe. A valve disc is slidably engaged inside the pressure relief valve at the pressure relief pipe and inside the pressure inlet valve at the connecting pipe.

[0008] Preferably, the card plate has a slot at its center that matches the diameter of the T-shaped rod, and the vertical section of the T-shaped rod can be movably engaged into the slot of the corresponding card plate.

[0009] Preferably, several sets of fixing blocks for installing T-shaped rods are welded and fixed on the outer arc wall of the housing. The support rods extending outward from the T-shaped end of the T-shaped rod are rotatably connected to the through holes of the two fixing blocks in the same set. The outer arc wall of the T-shaped rod away from the fixing block is provided with threads. The threaded section of the T-shaped rod is threaded with a nut for restricting the T-shaped rod at the clamping plate.

[0010] Preferably, the orifice cover has a through-hole with the same dimensions as the inner side of the pressure relief valve at its center. A rotating rod is welded and fixed to the arc-shaped side wall of the butterfly valve flap. The rotating rod is rotatably connected to the side wall of the pressure relief valve. A through-hole is provided at the center of the top surface of the butterfly valve flap. The rotating rod is installed below the opening of the connecting pipe. The butterfly valve flap never contacts the valve disc located inside the pressure relief valve during rotation.

[0011] Preferably, a support column is integrally formed at the center of the top surface of the valve disc, and at least two circumferentially distributed guide posts are slidably inserted into the top surface of the valve disc near the edge. The top ends of the guide posts are welded and fixed to the inner top surface of the corresponding pressure relief valve or pressure inlet valve.

[0012] Preferably, both the pressure relief valve and the pressure inlet valve have an integrally formed sliding sleeve at the center of their top surfaces, and the support of the valve disc is slidably inserted into the sliding sleeve at the corresponding position.

[0013] Preferably, the bottom end of the guide post is provided with a limiting block to prevent the valve disc from slipping; when the valve disc slides to the bottom, the top surface of the valve disc is located below the opening of the corresponding pressure relief pipe or connecting pipe; when the valve disc slides to the top, the bottom surface of the valve disc is located above the opening of the corresponding pressure relief pipe or connecting pipe.

[0014] Preferably, a handle is bolted to the top surface of the orifice cover at the end away from the hinge, and a filter screen is bolted to the bottom surface of both the pressure inlet valve and the pressure relief pipe.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. The pressure relief manhole for adjusting the opening can be adjusted by rotating the lever to change the position of the butterfly valve flap, thereby changing the opening degree;

[0017] 2. The pressure relief manhole with adjustable opening is equipped with a breather valve, which can automatically release or pressurize based on the pressure inside the housing. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2This is a schematic diagram of the overall structure of the breathing valve in the utility model;

[0020] Figure 3 This is a cross-sectional view of the breathing valve in the utility model.

[0021] Figure 4 This is a three-dimensional sectional view of the breathing valve in the utility model.

[0022] Figure 5 This is a bottom view schematic diagram of the breather valve structure in the utility model.

[0023] In the picture:

[0024] 1. Housing; 10. Hole cover; 11. Clamping plate; 12. Handle;

[0025] 2. Hinges;

[0026] 3. T-shaped rod; 30. Nut; 31. Fixing block;

[0027] 4. Breathing valve; 40. Pressure relief valve; 41. Butterfly valve flap; 410. Rotary rod; 42. Pressure relief pipe; 43. Pressure inlet valve; 44. Connecting pipe; 45. Valve disc; 46. Sliding sleeve; 47. Guide post; 48. Filter screen. Detailed Implementation

[0028] The technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0029] Please see Figures 1-5 This utility model provides a technical solution:

[0030] A pressure relief manhole with adjustable opening includes a housing 1. A manhole cover 10 is hinged to the top of the housing 1 via a hinge 2, connecting the housing 1 and the manhole cover 10. Several retaining plates 11 are welded and fixed to the arc-shaped outer wall of the manhole cover 10 to facilitate the installation of T-shaped rods 3. Several T-shaped rods 3, the same number as the retaining plates 11 and corresponding in position, are installed on the arc-shaped outer wall of the housing 1, allowing the T-shaped rods 3 to engage with the retaining plates 11. A breather valve 4, with its bottom end connected to the housing 1, is bolted to the center of the top surface of the manhole cover 10. The breather valve 4 is used for pressure relief or pressure injection. The breather valve 4 consists of a pressure relief valve 40 as the main body and a pressure relief valve 40 connected to the housing 1. The pressure relief valve 40 consists of a pressure inlet valve 43 on its side. A butterfly valve flap 41 is provided inside the pressure relief valve 40 near its lower end. The butterfly valve flap 41 is used to control the flow rate of pressure relief or pressure inlet. Several circumferentially distributed pressure relief pipes 42 are fixedly inserted into the outer wall of the pressure relief valve 40 near its top surface. The pressure relief pipes 42 are used to release the pressure inside the housing 1. The pressure relief valve 40 and the pressure inlet valve 43 are connected by a connecting pipe 44 to facilitate the joint control of pressure inlet and outlet. A valve disc 45 is slidably engaged inside the pressure relief valve 40 at the pressure relief pipe 42 and inside the pressure inlet valve 43 at the connecting pipe 44. These are used to isolate external components and keep the pressure state inside the housing 1 stable.

[0031] In this embodiment, the card plate 11 has a slot in the center that matches the diameter of the T-shaped rod 3. The vertical section of the T-shaped rod 3 can be movably engaged into the slot of the card plate 11 at the corresponding position, which facilitates fixing the position of the housing 1 and the hole cover 10.

[0032] In this embodiment, several sets of fixing blocks 31, arranged in pairs, are welded and fixed on the outer arc wall of the housing 1 for installing T-shaped rods 3. The support rods extending outward from the T-shaped end of the T-shaped rod 3 are rotatably connected to the through holes of the two fixing blocks 31 in the same set, which facilitates the rotation of the T-shaped rod 3. The outer arc wall of the end of the T-shaped rod 3 away from the fixing block 31 is provided with threads. The threaded section of the T-shaped rod 3 is threaded with nuts 30 for restricting the T-shaped rod 3 at the clamping plate 11, thereby strengthening the firmness between the housing 1 and the hole cover 10.

[0033] In this embodiment, the cover 10 has a centrally located opening with the same dimensions as the inner side of the pressure relief valve 40, connecting the interior of the housing 1 with the interior of the breather valve 4 to ensure the normal operation of the breather valve 4. A rotating rod 410 is welded and fixed to the arc-shaped side wall of the butterfly valve flap 41. The rotating rod 410 is rotatably connected to the side wall of the pressure relief valve 40. The flow rate between the pressure relief valve 40 and the breather valve 4 is adjusted by rotating the rod 410. A through hole is centrally located on the top surface of the butterfly valve flap 41 to keep the pressure relief valve 40 and the breather valve 4 in constant communication for automatic pressure regulation and to prevent hazards. The rotating rod 410 is installed below the opening of the connecting pipe 44. During the rotation of the butterfly valve flap 41, it never contacts the valve disc 45 located inside the pressure relief valve 40, thus maintaining the normal operation of the device.

[0034] In this embodiment, a support column is integrally formed at the center of the top surface of the valve disc 45. The support column is used to keep the valve disc 45 sliding stably. At least two circumferentially distributed guide posts 47 are slidably inserted into the top surface of the valve disc 45 near the edge. The top of the guide post 47 is welded and fixed to the inner top surface of the corresponding pressure relief valve 40 or pressure inlet valve 43. The guide post 47 is used to keep the sliding trajectory of the valve disc 45 stable and prevent the valve disc 45 from deviating.

[0035] In this embodiment, a sliding sleeve 46 is integrally formed at the center of the top surface of both the pressure relief valve 40 and the pressure inlet valve 43. The support of the valve disc 45 is slidably inserted into the sliding sleeve 46 at the corresponding position. The sliding sleeve 46 is used to provide sliding space for the support of the valve disc 45.

[0036] In this embodiment, the bottom end of the guide post 47 is provided with a limiting block to prevent the valve disc 45 from slipping; when the valve disc 45 slides to the bottom, the top surface of the valve disc 45 is located below the opening of the corresponding pressure relief pipe 42 or connecting pipe 44; when the valve disc 45 slides to the top, the bottom surface of the valve disc 45 is located above the opening of the corresponding pressure relief pipe 42 or connecting pipe 44.

[0037] In this embodiment, a handle 12 is bolted to the top surface of the hole cover 10 at the end away from the hinge 2 to facilitate opening the hole cover 10. The bottom surfaces of the pressure inlet valve 43 and the pressure relief pipe 42 are both bolted with filter screens 48 to prevent dust from falling into the housing 1.

[0038] In use, the adjustable pressure relief manhole of this utility model is first engaged with the T-shaped rod 3 in the slot of the fixing block 31, and the nut 30 at the threaded end of the T-shaped rod is tightened. The weight of the valve disc 45 is adjusted. When the pressure inside the housing 1 is stable, the breather valve 4 will not operate. When the pressure inside the housing 1 is greater than the pressure outside the housing 1, the pressure inside the housing 1 will open the valve disc 45 of the pressure relief valve 40 to release the pressure. When the pressure inside the housing 1 is less than the pressure outside the housing 1, the pressure outside the housing 1 will open the valve disc 45 of the pressure inlet valve 43 to allow pressure to enter the housing 1. At the same time, the rotating rod 410 can be rotated to adjust the position of the butterfly valve flap 41, change the flow space, and control the flow rate. In addition, a through hole is provided in the center of the butterfly valve flap 41 to maintain communication between the housing 1 and the breather valve 4, avoiding adverse consequences due to unstable pressure.

[0039] The foregoing has shown and described the basic principles, main features, and advantages of this embodiment of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and modifications can be made to this embodiment without departing from the spirit and scope of the present invention, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pressure relief manhole with adjustable opening, comprising a housing (1), characterized in that: The top of the housing (1) is hinged to a hole cover (10) by a hinge (2). Several clamping plates (11) are welded and fixed to the arc-shaped outer wall of the hole cover (10). Several T-shaped rods (3) with the same number and corresponding positions as the clamping plates (11) are installed on the arc-shaped outer wall of the housing (1). A breather valve (4) with its bottom end connected to the housing (1) is fixed to the center of the top surface of the hole cover (10) by bolts. The breather valve (4) consists of a pressure relief valve (40) as the main body and a pressure relief valve located in the middle of the pressure relief valve. (40) The pressure relief valve (43) is composed of a side pressure inlet valve (43). The pressure relief valve (40) has a butterfly valve flap (41) near the lower end inside. Several circumferentially distributed pressure relief pipes (42) are fixedly inserted into the outer wall of the pressure relief valve (40) near the top surface. The pressure relief valve (40) and the pressure inlet valve (43) are connected through a connecting pipe (44). A valve disc (45) is slidably engaged inside the pressure relief valve (40) at the pressure relief pipe (42) and inside the pressure inlet valve (43) at the connecting pipe (44).

2. The pressure relief manhole with adjustable opening according to claim 1, characterized in that: The card plate (11) has a slot in the center that matches the diameter of the T-shaped rod (3), and the vertical section of the T-shaped rod (3) can be movably engaged into the slot of the card plate (11) at the corresponding position.

3. The pressure relief manhole with adjustable opening according to claim 1, characterized in that: Several sets of fixing blocks (31) for installing T-shaped rods (3) are welded and fixed on the outer arc wall of the housing (1). The support rods extending outward from the T-shaped end of the T-shaped rod (3) are respectively rotatably connected to the through holes of the two fixing blocks (31) in the same set. The outer arc wall of the T-shaped rod (3) away from the fixing block (31) is provided with threads. The threaded section of the T-shaped rod (3) is threaded with nuts (30) for restricting the T-shaped rod (3) at the clamping plate (11).

4. The pressure relief manhole with adjustable opening according to claim 1, characterized in that: The orifice cover (10) has an opening at its center with the same dimensions as the inner side of the pressure relief valve (40). A rotating rod (410) is welded and fixed to the arc side wall of the butterfly valve flap (41). The rotating rod (410) is rotatably connected to the side wall of the pressure relief valve (40). A through hole is provided at the center of the top surface of the butterfly valve flap (41). The rotating rod (410) is installed below the opening of the connecting pipe (44). The butterfly valve flap (41) does not contact the valve disc (45) located inside the pressure relief valve (40) during rotation.

5. The pressure relief manhole with adjustable opening according to claim 1, characterized in that: A support column is integrally formed at the center of the top surface of the valve disc (45). At least two circumferentially distributed guide posts (47) are slidably inserted into the top surface of the valve disc (45) near the edge. The top of the guide posts (47) is welded and fixed to the inner top surface of the corresponding pressure relief valve (40) or pressure inlet valve (43).

6. The pressure relief manhole with adjustable opening according to claim 5, characterized in that: Both the pressure relief valve (40) and the pressure inlet valve (43) have an integrally formed sliding sleeve (46) at the center of their top surfaces, and the support of the valve disc (45) is slidably inserted into the sliding sleeve (46) at the corresponding position.

7. The pressure relief manhole with adjustable opening according to claim 6, characterized in that: The bottom end of the guide post (47) is provided with a limiting block to prevent the valve disc (45) from slipping; when the valve disc (45) slides to the bottom, the top surface of the valve disc (45) is located below the opening of the corresponding pressure relief pipe (42) or connecting pipe (44); when the valve disc (45) slides to the top, the bottom surface of the valve disc (45) is located above the opening of the corresponding pressure relief pipe (42) or connecting pipe (44).

8. The pressure relief manhole with adjustable opening according to claim 1, characterized in that: The top surface of the hole cover (10) is fixed with a handle (12) by bolts at the end away from the hinge (2), and the bottom surfaces of the pressure inlet valve (43) and the pressure relief pipe (42) are both fixed with filter screens (48) by bolts.

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