Atmospheric pressure storage tank pressure relief manhole

Abstract

The invention provides a pressure relief manhole of an atmospheric storage tank. The pressure relief manhole comprises a sealing seat, an opening part and a rainproof cover, a butt flange is arranged at one end of the sealing seat and is connected with a mounting flange on the pressure relief manhole mounting connecting pipe, and a sealing rubber ring is arranged at the other end of the sealing seat; the rainproof cover is arranged on the butt flange of the sealing seat and covers the sealing seat; the opening part comprises a sealing plate, a balancing weight and a connecting rod, one end of the connecting rod is connected with the sealing plate, and the other end of the connecting rod is connected with the balancing weight; the sealing plate is attached to the sealing rubber ring, and the balancing weight penetrates through the pressure relief manhole mounting connecting pipe and extends into the inner side of the top plate; the gravity center of the opening part is below the sealing plate; guiding of the opening part is achieved by inserting a sealing plate center guide rod into a rain cover center guide sleeve. The gravity center of the opening part is effectively adjusted to be below the sealing plate by additionally arranging the connecting rod and the balancing weight on the opening part, and the risks that when an existing pressure relief manhole acts, horizontal drifting occurs, local leakage is caused by the wind action in strong wind weather, and a guide device is frozen and stuck in freezing weather are avoided.

Description

Technical Field

[0001] This application belongs to the field of atmospheric pressure storage tank technology, and more specifically, relates to a pressure relief manhole for an atmospheric pressure storage tank. Background Technology

[0002] Under normal operating conditions, the pressure inside the atmospheric pressure storage tank is released by the breather valve on the top of the tank, which controls the maximum allowable positive pressure and the maximum allowable negative pressure. When the breather valve reaches its maximum discharge, if the pressure inside the tank continues to rise, the pressure relief manhole will open to discharge until the pressure inside the tank drops to the maximum allowable pressure. Then the pressure relief manhole will close and discharge will stop, switching to the breather valve for discharge until the pressure inside the tank drops to the normal operating pressure, at which point the breather valve will stop discharging.

[0003] The opening section of existing pressure relief manholes is generally installed above the sealing seat, with the center of gravity above the sealing surface. This results in a high center of gravity for the opening section, causing horizontal drift during opening and inaccurate repositioning when venting is complete. Consequently, the pressure on the sealing surface is uneven, posing a risk of localized leakage. The guide devices for the opening section are generally located on the outer wall of the sealing seat cylinder, with multiple devices spaced at equal arc intervals. In snowy or freezing rainy weather, the guide devices are prone to freezing and becoming stuck, preventing the opening section from operating. Pressure relief manholes are usually installed at the highest point of the tank top center. In strong winds, due to the high center of gravity, the opening section is affected by wind force and may open unexpectedly. Summary of the Invention

[0004] In view of the various technical problems caused by the high center of gravity of the opening part of the pressure relief manhole in the prior art, the purpose of this application embodiment is to provide a pressure relief manhole for atmospheric pressure storage tanks. By setting the center of gravity of the opening part in the sealed space of the pressure relief manhole at the top of the tank, its center of gravity is lower than the sealing plate, and the guide device is set at the center under the rain cover, the phenomenon of the guide device freezing and being unable to open will not occur.

[0005] To achieve the above objectives, the technical solution adopted in this application is: to provide a pressure relief manhole for an atmospheric pressure storage tank, which is installed on the top plate of the tank. The top plate is provided with a pressure relief manhole installation pipe. The pressure relief manhole for the atmospheric pressure storage tank includes: a sealing seat, an opening part, and a rainproof cover.

[0006] One end of the sealing seat is provided with a docking flange, which is sealed to the mounting flange of the pressure relief manhole mounting pipe. The other end of the sealing seat is provided with the sealing rubber ring. The rain cover is provided on the docking flange of the sealing seat and covers the sealing seat.

[0007] The opening section includes a sealing plate, a connecting rod, and a counterweight. One end of the connecting rod is connected to the sealing plate, and the other end is connected to the counterweight. The sealing plate is attached to the sealing ring, and the counterweight extends through the pressure relief manhole mounting pipe into the inner side of the top plate. The center of gravity of the opening section is below the sealing plate.

[0008] The opening section is guided by a guide rod located at the center of the sealing plate, which is inserted into a guide sleeve located at the center of the rain cover.

[0009] In one embodiment, the sealing plate is a circular stainless steel plate that is thin in the middle and thick at the edges, and the surface of the sealing plate that is in contact with the sealing ring is a precision-machined sealing surface.

[0010] In one embodiment, the inner wall of the other end of the sealing seat is set as an inclined surface, and the longitudinal section of the sealing ring is barbed; the sealing ring is sleeved on the other end of the sealing seat and secured on the outside by a stainless steel cable tie.

[0011] In one embodiment, the outer diameter of the counterweight is smaller than the inner diameter of the pressure relief manhole mounting pipe, the counterweight is a stainless steel circular plate, and the counterweight has a plurality of regularly arranged circular holes.

[0012] In one embodiment, three connecting rods are provided at equal arc intervals, and the connecting rods are stainless steel pipes or stainless steel angle steel.

[0013] In one embodiment, the guide rod is fixed at the center of the sealing plate, the guide sleeve is disposed at the center of the rain cover and passes through it, the guide rod and the guide sleeve are slidably connected, the exposed end of the guide sleeve of the rain cover has external threads and is provided with a cap-shaped nut that mates with it.

[0014] In one embodiment, the guide rod is welded to the upper surface of the sealing plate; or, the sealing plate has a through hole in the center, one end of the guide rod is a screw, the screw passes through the through hole and is provided with a hexagonal nut, and the screw on the upper and lower sides of the sealing plate is respectively provided with a sealing gasket and a backstop washer.

[0015] In one embodiment, the rain cover is fixedly connected to the mating flange of the sealing seat and the mounting flange of the pressure relief manhole mounting pipe by four long double-ended bolts with equal arc spacing, and a support sleeve is fitted on the four long double-ended bolts between the flange of the sealing seat and the rain cover.

[0016] In one embodiment, the outer side of the sealing plate and the sealing seat is provided with a spiral-shaped conductive soft copper wire.

[0017] In one embodiment, the combined weight of the opening portion and the guide rod is equal to the upward force exerted on the sealing plate by the maximum allowable working pressure of the atmospheric pressure tank.

[0018] The beneficial effects of the atmospheric pressure storage tank pressure relief manhole provided in this application are as follows:

[0019] 1. By adding connecting rods and counterweights, the center of gravity of the opening section is effectively adjusted to below the sealing plate, reducing the risk of horizontal drift of the opening section when the pressure relief manhole is opened, and the risk of local leakage caused by wind force in windy weather.

[0020] 2. The guide part of the opening section is located in the center inside the rain cover. This way, the guide part is less affected by the external environment and will not cause problems such as the guide device freezing and getting stuck.

[0021] 3. The rain cover only serves a protective function. The weight of the rain cover and the snow, debris, etc. accumulated on it will not affect the opening of the sealing plate. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of the pressure relief manhole of an atmospheric pressure storage tank provided in an embodiment of this application.

[0024] The following are the labeling elements in the figure:

[0025] 1. Top plate; 2. Pressure relief manhole installation pipe; 3. Support sleeve; 4. Long double-ended bolt; 5. Rain cover; 6. Guide sleeve; 7. Sealing plate; 8. Sealing ring; 9. Stainless steel cable tie; 10. Sealing seat; 11. Guide rod; 12. Connecting rod; 13. Counterweight; 14. Hex nut; 15. Round hole; 16. Antistatic soft copper wire; 17. Sealing gasket; 18. Anti-reverse washer; 19. Cap nut; 20. Standard sealing gasket. Detailed Implementation

[0026] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0027] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0028] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0030] like Figure 1 As shown, a pressure relief manhole for an atmospheric pressure storage tank provided in this application embodiment will now be described. The pressure relief manhole is located on the top plate 1 of the atmospheric pressure storage tank. The top plate 1 has a pressure relief manhole installation pipe 2, which has its own installation flange. The atmospheric pressure storage tank pressure relief manhole includes: a sealing seat 10 with a connecting flange, an opening portion, a guide portion, a sealing ring 8, and a rain cover 5. The sealing seat 10 has a tubular structure and its inner diameter is the same as the inner diameter of the pressure relief manhole installation pipe 2. The connecting flange is welded to one end of the sealing seat 10, and this connecting flange is sealed to the installation flange of the pressure relief manhole installation pipe 2. The other end of the sealing seat 10 is provided with a sealing ring 8. The rain cover 5 is fixed to the connecting flange of the sealing seat 10 and covers the sealing seat 10.

[0031] The opening section includes a sealing plate 7, a connecting rod 12, and a counterweight 13. One end of the connecting rod 12 is connected to the sealing plate 7, and the other end is connected to the counterweight 13. The diameter of the sealing plate 7 is larger than the outer diameter of the sealing seat 10, and the diameter of the counterweight 13 is smaller than the inner diameter of the sealing seat 10. The sealing plate 7 is attached to the sealing ring 8, and the counterweight 13 extends through the pressure relief manhole installation pipe 2 into the inner side of the top plate 1. The sealing plate 7 and the sealing ring 8 play a sealing role. Due to the presence of the counterweight 13, the center of gravity of the opening section is below the sealing plate 7, so the stability of the sealing plate 7 is relatively good, which can effectively avoid horizontal drift.

[0032] The guiding section includes a guide rod 11 located at the center of the sealing plate 7 and a guide sleeve 6 located at the center of the rain cover 5. The guide rod 11 and the guide sleeve 6 are inserted and fitted together with a clearance, allowing the opening part to move freely up, down, left, and right. By positioning the guiding section at the center of the rain cover 5, it is less affected by the external environment. At the same time, since the guiding section is on the centerline, only one is needed to provide guidance, reducing the mutual interference between multiple guiding devices in the prior art.

[0033] Specifically, in this embodiment, the sealing plate 7 is a circular stainless steel plate that is thin in the middle and thick at the edges. The surface of the sealing plate 7 that is in contact with the sealing ring 8 is a precision-machined sealing surface, which ensures that the sealing surface has good sealing performance under the weight of the opening part itself.

[0034] In this embodiment, the inner wall of the other end of the sealing seat 10 is thinned to form an inclined surface that is thinner at the top and thicker at the bottom, and the longitudinal section of the sealing ring 8 is barbed; the sealing ring 8 is interference-fitted onto the other end of the sealing seat 10 and secured tightly on the outside by a stainless steel cable tie 9. The function of securing it with the stainless steel cable tie 9 is to ensure that the inner surface of the sealing ring 8 does not leak from the mating surface with the sealing seat 10.

[0035] In this embodiment, the outer diameter of the counterweight 13 is smaller than the inner diameter of the pressure relief manhole mounting pipe 2. The counterweight 13 is a stainless steel round plate, and the counterweight 13 is provided with a number of regularly arranged round holes 15. The function of the round holes 15 is to prevent liquid or other dirt from accumulating on the counterweight 13, and also to provide ventilation.

[0036] In this embodiment, three connecting rods 12 are arranged at equal arc intervals, and the connecting rods 12 are stainless steel pipes or stainless steel angle steel. The connecting rods 12 are welded to the sealing plate 7 and the counterweight block 13 respectively.

[0037] In this embodiment, the rain cover 5 is shaped like an inverted basin. The guide rod 11 is fixed to the center of the outer surface of the sealing plate 7, and the guide sleeve 6 is inserted through the center of the rain cover 5. The guide sleeve 6 has external threads at the exposed end of the rain cover 5. The guide rod 11 and the guide sleeve 6 are slidably assembled and inserted to guide and limit the up and down movement of the sealing plate 7. The guide sleeve 6 is provided with a cap nut 19 at the exposed end of the rain cover 5. The cap nut 19 is used to seal the outer end of the guide sleeve 6 to prevent impurities from entering and affecting the sliding of the guide rod 11, and also serves as a grease filling port.

[0038] In this embodiment, the sealing plate 7 has a through hole in its center, and one end of the guide rod 11 is a threaded rod. The threaded rod passes through the through hole and is fixed with a hexagonal nut 14. Sealing gaskets 17 and anti-reverse washers 18 are respectively provided on the threaded rods on the upper and lower sides of the sealing plate 7 to ensure the sealing performance where the guide rod 11 passes through the sealing plate 7. In other embodiments, the guide rod 11 is welded to the outer surface of the sealing plate 7, forming an integral structure with the sealing plate 7.

[0039] In this embodiment, the mating flange of the sealing seat 10 and the mounting flange of the pressure relief manhole mounting pipe 2 are connected by multiple double-ended bolts with equal arc spacing. Four of these double-ended bolts are longer than the others and are designated as long double-ended bolts 4. The rain cover 5 is fixedly connected to the sealing seat 10 by the four long double-ended bolts 4 with equal arc spacing. The distance between the rain cover 5 and the sealing seat 10 is determined by the length of the support sleeve 3 fitted onto the long double-ended bolts 4. The length of the support sleeve 3 can be used to adjust the sliding assembly length of the guide rod 11 and the guide sleeve 6, ensuring that the guide rod 11 does not detach from the guide sleeve 6 when the sealing plate 7 is in a sealed state. A standard sealing gasket 20 is provided between the mating flange and the mounting flange for sealing.

[0040] In order to release the static electricity generated by the friction between the exhaust gas and the sealing surface, the outer side of the sealing plate 7 and the sealing seat 10 is provided with a spiral conductive soft copper wire 16.

[0041] In this embodiment, the combined weight of the opening portion, guide rod 12, sealing gasket 17, and anti-reverse washer 18 is equal to the upward force exerted on the sealing plate 7 by the maximum allowable working pressure of the atmospheric pressure tank.

[0042] In this embodiment, the installation process of the pressure relief manhole of the atmospheric pressure storage tank is as follows:

[0043] During on-site installation, first clean the inner wall of the existing pressure relief manhole installation pipe 2 on the tank top, smooth out any protrusions on the inner wall, and clean the sealing surface of the installation flange.

[0044] To install the sealing seat 10, first place the standard sealing gasket 20 on the mounting flange of the pressure relief manhole mounting pipe 2, and then install the sealing seat 10. Ensure the concentricity of the sealing seat 10 and the pressure relief manhole mounting pipe 2. After confirming that it is normal, tighten it with double-ended bolts (the four bolt holes with equal arc spacing do not need to be threaded with bolts).

[0045] Install the sealing ring 8 on the sealing seat 10 and secure it with stainless steel cable ties 9.

[0046] To install the opening part, vertically insert the end with the counterweight 13 into the sealing seat 10, and the sealing plate 7 is attached to the sealing ring 8.

[0047] Move the sealing plate 7, check the tightness of the fit between the sealing plate 7 and the sealing ring 8, and install the static-dissipating soft copper wire 16.

[0048] Install four long double-ended bolts 4 into the four bolt holes that are not bolted, and then put on the support sleeves 3.

[0049] Apply grease to the inside of the guide sleeve 6, fasten the rain cover 5, insert four long double-ended bolts 4 into the four bolt holes on it, and after confirming that the guide rod 11 is inserted into the guide sleeve 6, use the hexagonal nut 14 to fasten the rain cover 5 and the sealing seat 10 together, and then use the cap nut 19 to screw onto the external thread of the guide sleeve 6.

[0050] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A pressure relief manhole for an atmospheric pressure storage tank, disposed on a top plate (1) on the top of the tank, wherein the top plate (1) is provided with a pressure relief manhole installation pipe (2), characterized in that, include: Sealing seat (10), opening part and rain cover (5); One end of the sealing seat (10) is provided with a docking flange, which is sealed to the mounting flange of the pressure relief manhole mounting pipe (2). The other end of the sealing seat (10) is provided with a sealing ring (8). The rain cover (5) is provided on the docking flange of the sealing seat (10) and covers the sealing seat (10). The opening section includes: a sealing plate (7), a connecting rod (12), and a counterweight (13). One end of the connecting rod (12) is connected to the sealing plate (7), and the other end is connected to the counterweight (13). The sealing plate (7) is attached to the sealing ring (8), and the counterweight (13) extends through the pressure relief manhole mounting pipe (2) into the inner side of the top plate (1). The center of gravity of the opening section is below the sealing plate (7). The opening portion is guided by a guide rod (11) located at the center of the sealing plate (7) inserted into a guide sleeve (6) located at the center of the rain cover (5).

2. The atmospheric pressure storage tank pressure relief manhole as described in claim 1, characterized in that: The sealing plate (7) is a circular stainless steel plate that is thin in the middle and thick at the edges. The surface of the sealing plate (7) that is in contact with the sealing ring (8) is a precision-machined sealing surface.

3. The atmospheric pressure storage tank pressure relief manhole as described in claim 2, characterized in that: The inner wall of the other end of the sealing seat (10) is inclined, and the longitudinal section of the sealing ring (8) is barbed; the sealing ring (8) is sleeved on the other end of the sealing seat (10) and tightened on the outside by a stainless steel cable tie (9).

4. The atmospheric pressure storage tank pressure relief manhole as described in claim 3, characterized in that: The outer diameter of the counterweight (13) is smaller than the inner diameter of the pressure relief manhole mounting pipe (2). The counterweight (13) is a stainless steel round plate, and the counterweight (13) has a number of regularly arranged round holes (15).

5. The atmospheric pressure storage tank pressure relief manhole as described in claim 4, characterized in that: The connecting rod (12) is provided with three rods at equal arc intervals. The connecting rod (12) is a stainless steel pipe or a stainless steel angle steel.

6. The atmospheric pressure storage tank pressure relief manhole as described in claim 1, characterized in that: The guide rod (11) is fixed at the center of the sealing plate (7), the guide sleeve (6) is set at the center of the rain cover (5) and passes through it, the guide rod (11) and the guide sleeve (6) are inserted and slidably assembled, and the exposed end of the guide sleeve (6) on the rain cover (5) is provided with a cap nut (19).

7. The atmospheric pressure storage tank pressure relief manhole as described in claim 6, characterized in that: The guide rod (11) is welded to the upper surface of the sealing plate (7); or, the sealing plate (7) has a through hole in the center, one end of the guide rod (11) is a screw, the screw passes through the through hole and is provided with a hexagonal nut, and the screw on the upper and lower sides of the sealing plate (7) is provided with a sealing gasket (17) and a backstop washer (18).

8. The atmospheric pressure storage tank pressure relief manhole as described in any one of claims 1-7, characterized in that: The rain cover (5) is fixedly connected to the mating flange of the sealing seat (10) and the mounting flange of the pressure relief manhole mounting pipe (2) by four long double-ended bolts (4) with equal arc spacing. A support sleeve (3) is fitted on the long double-ended bolts (4) between the mating flange of the sealing seat (10) and the rain cover (5).

9. The atmospheric pressure storage tank pressure relief manhole as described in claim 8, characterized in that: The outer side of the sealing plate (7) and the sealing seat (10) is provided with a spiral-shaped conductive soft copper wire (16).

10. The atmospheric pressure storage tank pressure relief manhole as described in claim 1, characterized in that: The combined weight of the opening portion and the guide rod (11) is equal to the upward force exerted on the sealing plate (7) by the maximum allowable working pressure of the atmospheric pressure tank.

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