Storage tank automatic vent valve with nitrogen sealing function

Abstract

The utility model provides a storage tank automatic vent valve with a nitrogen sealing function, relates to the technical field of petroleum storage and transportation safety, and solves the technical problems of oil product loss and potential safety hazards in the prior art. The device comprises a vent valve, a sealing cover and a breather valve mechanism, the sealing cover is arranged on the vent valve, the breather valve mechanism is arranged on the sealing cover, and a nitrogen injection connector used for being connected with external nitrogen supply equipment is arranged on the sealing cover. The sealing cover is arranged and is used for being connected with nitrogen supply equipment, so that air is prevented from entering the oil tank by introducing nitrogen when the oil tank supplies oil, and the problem of loss caused by direct communication between the oil product and the outside can be solved by adopting a nitrogen sealing mode; and the problem of potential safety hazards caused by air entering the oil tank can be solved.

Description

Technical Field

[0001] This utility model relates to the field of petroleum storage and transportation safety technology, and in particular to an automatic venting valve for storage tanks with nitrogen sealing function. Background Technology

[0002] Storage tanks are crucial equipment in oil and gas gathering, transportation, and storage systems. With the increasing need for national strategic crude oil reserves and energy security, storage tanks are becoming larger, with some reaching capacities of up to 15 × 10⁴ m³. 3 According to GB50341—2014 "Design Code for Vertical Cylindrical Welded Steel Oil Tanks", external and internal floating roof tanks for Class A, B, and C liquids should be equipped with automatic vent valves. Existing automatic vent valve structures are generally as follows: Figure 1 As shown, the main components include a valve body 101, a valve stem 102, and a valve cover 103. The valve body 101 is welded to the floating roof, the valve cover 103 is located on top of the valve body 101, and the valve stem is sleeved on the valve body 101 and connected to the valve cover 103. When the floating roof is in a supported state, the valve stem 102 drives the valve cover 103 to separate from the valve body 101, and the vent valve automatically opens, allowing air to enter the floating roof and enabling the oil in the tank to be extracted. Conversely, when the floating roof is in a floating state, the automatic vent valve automatically closes. The automatic vent valve is an important component of the floating roof and plays a crucial role in the safety of the entire floating roof tank. However, this structure has the following drawbacks: after the valve cover is raised, the position of the valve stem is fixed, and at this time, the oil in the tank is in a state of free exchange with the outside air, meaning that the upper surface of the oil cannot be sealed and is in full contact with the air. If the storage tank needs to maintain this state for a period of time, it will lead to the evaporation and loss of volatile oils, wasting resources, and there is also a safety hazard of tank combustion and explosion. Utility Model Content

[0003] The purpose of this invention is to provide an automatic venting valve for storage tanks with nitrogen sealing function, which solves the technical problems of oil loss and safety issues existing in the prior art. The various technical effects of the preferred technical solution among the many technical solutions provided by this invention are detailed below.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] The present invention provides an automatic venting valve for storage tanks with nitrogen sealing function, comprising a venting valve, a sealing cover, and a breather valve mechanism. The sealing cover is disposed on the venting valve, the breather valve mechanism is disposed on the sealing cover, and the sealing cover is provided with a nitrogen injection connector for connecting to an external nitrogen supply device.

[0006] Preferably, the breathing valve mechanism comprises an exhalation valve assembly and an inhalation valve assembly, the top of the sealing cover has an upper opening, the exhalation valve assembly is arranged on the opening, and the inhalation valve assembly is arranged on the exhalation valve disc of the exhalation valve assembly.

[0007] Preferably, the exhalation valve assembly comprises an exhalation valve disc, an exhalation sealing pad, a guide rod, an exhalation spring and a pressure regulating nut, the exhalation valve disc is arranged on the upper opening, the exhalation valve disc is sealingly connected with the sealing cover through the exhalation sealing pad, the upper flange is arranged on the periphery of the upper opening, the upper flange is connected with the exhalation valve disc through the guide rod, the exhalation valve disc can slide along the guide rod, one end of the exhalation valve disc away from the upper flange abuts against one end of the exhalation spring, the other end of the exhalation spring abuts against the pressure regulating nut, and the pressure regulating nut is threadedly connected with the guide rod.

[0008] Preferably, the exhalation valve assembly further comprises a spring seat, a rain cover and a lifting ring nut, the spring seat is arranged between the exhalation valve disc and the exhalation spring, the rain cover is arranged on the sealing cover, and the rain cover is connected with the guide rod through the lifting ring nut.

[0009] Preferably, the inhalation valve assembly comprises an inhalation valve rod, an inhalation valve cover, an inhalation spring and a pressure regulating nut sleeve, the exhalation valve disc is provided with a guide hole, the periphery of the guide hole is provided with an inhalation hole, the inhalation valve rod is threadedly connected with the pressure regulating nut sleeve after sequentially penetrating through the inhalation valve cover, the guide hole and the inhalation spring, and the inhalation valve cover is arranged on the side of the exhalation valve disc towards the inside of the sealing cover.

[0010] Preferably, the inhalation hole has a flange on the end face towards the end face of the inhalation valve cover, and the flange abuts against the inhalation valve cover.

[0011] Preferably, the application further comprises a connecting flange and a blowdown valve, the connecting flange is arranged on the periphery of the valve body of the air valve, the bottom wall of the sealing cover is connected with the connecting flange, and the blowdown valve is arranged on the connecting flange.

[0012] Preferably, the application further comprises a pressure gauge, and the pressure gauge is arranged on the side wall of the sealing cover.

[0013] The above technical scheme is adopted in the application, and the application has at least the following beneficial effects:

[0014] The automatic breather valve with nitrogen sealing function for the storage tank comprises a breather valve, a sealing cover and a breather valve mechanism, the sealing cover is arranged on the breather valve, the breather valve mechanism is arranged on the sealing cover, and a nitrogen injection joint for connecting an external nitrogen supply device is arranged on the sealing cover, the sealing cover is arranged on the breather valve to avoid the entry of external air into the oil tank, when the oil tank is discharging oil, the breather valve is usually used to passively enter air into the oil tank to balance the pressure difference, and in the application, the sealing cover and the nitrogen injection joint arranged on the sealing cover are used to connect the external nitrogen supply device to balance the pressure difference by introducing nitrogen, thereby realizing the nitrogen sealing function and solving the problem of safety hazards caused by the entry of air into the oil tank.

[0015] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory and are not restrictive of the application. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0017] Figure 1 is a schematic diagram of the structure of the prior art automatic breather valve provided by the embodiments of the present application;

[0018] Figure 2 is a schematic diagram of the structure of the automatic breather valve with nitrogen sealing function for the storage tank provided by the embodiments of the present application;

[0019] Figure 3 is Figure 2 is a schematic diagram of the local structure of the exhalation valve assembly in the application;

[0020] Figure 4 is Figure 2 is a schematic diagram of the local structure of the inhalation valve assembly in the application.

[0021] 1, vent valve; 101, valve body; 102, valve stem; 103, valve cover; 2, sealing cover; 3, breathing valve mechanism; 4, nitrogen injection joint; 5, pressure gauge; 6, connecting flange; 7, blowdown valve; 8, exhalation valve assembly; 9, inhalation valve assembly; 10, exhalation valve disc; 11, exhalation sealing gasket; 12, guide rod; 13, exhalation spring; 14, pressure regulating nut; 15, spring seat; 16, rain cover; 17, lifting ring nut; 18, upper flange; 19, inhalation valve stem; 20, inhalation valve cover; 21, inhalation spring; 22, pressure regulating sleeve; 23, inhalation hole; 24, flange. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the utility model clearer, the technical scheme of the utility model will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope protected by the utility model.

[0023] The specific embodiment of the utility model provides a kind of automatic vent valve of storage tank with nitrogen seal function, as shown in Fig. Figure 2 It includes vent valve 1, sealing cover 2 and breathing valve mechanism 3,

[0024] The sealing cover 2 is covered on vent valve 1, for sealing vent valve 1, to ensure that vent valve 1 is not communicated with outside air;

[0025] Breathing valve mechanism 3 is arranged on sealing cover 2, and breathing valve mechanism 3 is used to ensure emergency breathing gas;

[0026] Sealing cover 2 is provided with nitrogen injection joint 4 for connecting external nitrogen supply equipment;

[0027] In the case of oil tank oil, nitrogen is supplied by nitrogen supply equipment, so as to avoid the problem of loss caused by direct communication between oil in oil tank and outside, and also solve the problem of safety hazard caused by air entering oil tank.

[0028] In the specific embodiment of the application, pressure gauge 5 is also included, and the pressure gauge 5 is arranged on the side wall of the sealing cover 2. The pressure condition of the sealing cover 2 is monitored by the pressure gauge 5.

[0029] In some embodiments, connecting flange 6 and blowdown valve 7 are also included, connecting flange 6 is arranged on the peripheral side of the valve body 101 of vent valve 1, the bottom wall of sealing cover 2 is connected with connecting flange 6, and the sealing connection between sealing cover 2 and vent valve 1 is realized by flange connection; Blowdown valve 7 is arranged on connecting flange 6, and blowdown valve 7 is used to discharge the accumulated dirt in sealing cover 2. In some embodiments, connecting flange 6 and blowdown valve 7 are also included, connecting flange 6 is arranged on the peripheral side of the valve body 101 of vent valve 1, the bottom wall of sealing cover 2 is connected with connecting flange 6, and the sealing connection between sealing cover 2 and vent valve 1 is realized by flange connection; Blowdown valve 7 is arranged on connecting flange 6, and blowdown valve 7 is used to discharge the accumulated dirt in sealing cover 2.

[0030] In some embodiments, the breathing valve mechanism 3 comprises an exhaust valve assembly 8 and an intake valve assembly 9, the top of the seal cover 2 has an upper opening, the exhaust valve assembly 8 is arranged on the upper opening, the intake valve assembly 9 is arranged on the exhaust valve disc 10 of the exhaust valve assembly 8, wherein the exhaust valve assembly 8 is used to exhaust gas in emergency to avoid deformation and damage of the oil tank body due to overpressure, and the intake valve assembly 9 is used to inhale gas in emergency to avoid deformation and damage of the oil tank body due to excessive vacuum.

[0031] Specifically, the exhaust valve assembly 8 can comprise an exhaust valve disc 10, an exhaust valve sealing pad 11, a guide rod 12, an exhaust spring 13, and a pressure regulating nut 14. The exhaust valve disc 10 is arranged on the upper opening, and the exhaust valve disc 10 is sealingly connected with the seal cover 2 through the exhaust valve sealing pad 11 to ensure the sealing effect. The upper opening is provided with an upper flange 18, the upper flange 18 is connected with the exhaust valve disc 10 through the guide rod 12, the guide rod 12 plays a guiding role on the exhaust valve disc 10, the exhaust valve disc 10 can slide along the guide rod 12, one end of the exhaust valve disc 10 away from the upper flange 18 abuts against one end of the exhaust spring 13, the other end of the exhaust spring 13 abuts against the pressure regulating nut 14, the pressure regulating nut 14 is threadedly connected with the guide rod 12, by rotating the position of the pressure regulating nut 14 on the guide rod 12, the pressure of the exhaust spring 13 can be adjusted, so as to realize the adjustment of the pressure of the exhaust valve disc 10, and when the pressure of the gas in the seal cover 2 is greater than the pressure of the exhaust spring 13 acting on the exhaust valve disc 10, the gas in the seal cover 2 can push the exhaust valve disc 10 to move, at this time, the gas can be discharged from the gap between the exhaust valve disc 10 and the upper flange 18, thereby playing a role in exhausting gas in emergency to avoid deformation and damage of the oil tank body due to overpressure.

[0032] Specifically, the exhaust valve assembly 8 can further comprise a spring seat 15, a rain cover 16, and a lifting ring nut 17. The spring seat 15 is arranged between the exhaust valve disc 10 and the exhaust spring 13, the rain cover 16 is arranged on the seal cover 2, and the rain cover 16 plays a role of preventing rain, and the rain cover 16 is connected with the top of the guide rod 12 through the lifting ring nut 17.

[0033] The specific air suction valve assembly 9 comprises an air suction valve rod 19, an air suction valve cover 20, an air suction spring 21 and a pressure regulating screw sleeve 22, the air suction valve rod 19 is sequentially threaded through the air suction valve cover 20, the guide hole and the air suction spring 21 and is screwed with the pressure regulating screw sleeve 22, the air suction valve cover 20 is arranged on the side of the air exhaust valve disc 10 facing the inside of the sealing cover 2, the pressure of the air suction spring 21 can be adjusted through the pressure regulating screw sleeve 22, so as to indirectly adjust the abutting force of the air suction valve cover 20, so that when the pressure inside the sealing cover 2 is reduced, the pressure difference between the inside and outside of the sealing cover 2 is large, and the force of the external air pressure on the air suction valve cover 20 is greater than the force of the air suction spring 21, the air suction valve cover 20 is separated from the air exhaust valve disc 10, at this time, the air suction hole 23 is opened, and the gas enters from the outside to the inside to inhale the gas in the emergency situation to avoid the deformation and damage of the oil tank body due to the excessively high vacuum degree, of course, this is the response scheme for responding to the deformation and damage of the oil tank body due to the excessively high vacuum degree in the case of problems in the nitrogen supply equipment.

[0034] Specifically, the end face of the air suction hole 23 towards the air suction valve cover 20 has a flange 24, the flange 24 abuts against the air suction valve cover 20, and the flange 24 and the air suction valve cover 20 form a seal therebetween.

[0035] In the present application, the terms "one embodiment", "some embodiments", "example", "specific example", "some examples" and the like mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or features described in the present application and the characteristics of different embodiments or examples without contradiction.

[0036] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any skilled person in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A self-venting valve for a tank having a nitrogen seal function, characterized by, The invention relates to a nitrogen filling valve, which comprises a breather valve, a sealing cover arranged on the breather valve, and a breathing valve mechanism arranged on the sealing cover, wherein a nitrogen filling connector for connecting an external nitrogen supply device is arranged on the sealing cover, and the breathing valve mechanism comprises an exhalation valve assembly and an inhalation valve assembly, and the top of the sealing cover is provided with an upper opening, and the exhalation valve assembly is arranged on the upper opening, and the inhalation valve assembly is arranged on the exhalation valve disc of the exhalation valve assembly.

2. The automatic venting valve for a tank with a nitrogen seal function according to claim 1, characterized by, The exhalation valve assembly comprises an exhalation valve disc, an exhalation sealing gasket, a guide rod, an exhalation spring, and a pressure regulating nut, the exhalation valve disc is arranged on the upper opening, the exhalation valve disc is sealingly connected with the sealing cover through the exhalation sealing gasket, the upper opening is provided with an upper flange, the upper flange is connected with the exhalation valve disc through the guide rod, the exhalation valve disc can slide along the guide rod, one end of the exhalation valve disc away from the upper flange abuts against one end of the exhalation spring, the other end of the exhalation spring abuts against the pressure regulating nut, and the pressure regulating nut is threadedly connected with the guide rod.

3. The automatic venting valve for a tank with a nitrogen seal function according to claim 2, characterized by, The exhalation valve assembly further comprises a spring seat, a rain cover, and a lifting ring nut, the spring seat is arranged between the exhalation valve disc and the exhalation spring, the rain cover is arranged on the sealing cover, and the rain cover is connected with the guide rod through the lifting ring nut.

4. The automatic venting valve with nitrogen sealing function for a storage tank according to claim 2 or 3, characterized in that, The inhalation valve assembly comprises an inhalation valve rod, an inhalation valve cover, an inhalation spring, and a pressure regulating nut sleeve, the exhalation valve disc is provided with a guide hole, the periphery of the guide hole is provided with an inhalation hole, the inhalation valve rod is threadedly connected with the pressure regulating nut sleeve after sequentially penetrating through the inhalation valve cover, the guide hole, and the inhalation spring, and the inhalation valve cover is arranged on the side of the exhalation valve disc facing the inside of the sealing cover.

5. The automatic venting valve for a tank with a nitrogen seal function according to claim 4, characterized by, The end face of the inhalation hole towards the end face of the inhalation valve cover is provided with a flange, and the flange abuts against the inhalation valve cover.

6. The automatic venting valve for a tank with a nitrogen seal function according to claim 1, characterized by, The invention further comprises a connecting flange and a blowdown valve, the connecting flange is arranged on the periphery of the valve body of the breather valve, the bottom wall of the sealing cover is connected with the connecting flange, and the blowdown valve is arranged on the connecting flange.

7. The automatic venting valve for a tank with a nitrogen seal function according to claim 1, characterized by, The invention further comprises a pressure gauge, and the pressure gauge is arranged on the side wall of the sealing cover.

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