Vacuum safety valve with online repair

Abstract

The utility model provides a vacuum safety valve of on -line overhauling: including valve body, exhaust component and suction component, have a valve cavity in valve body, be equipped with with valve cavity intercommunication's flange mouth, exhaust port and suction port on valve body, flange mouth is used for connecting to the storage tank, exhaust component and suction component are connected on exhaust port and suction port respectively, be equipped with overhauling switch mechanism on valve body, overhauling switch mechanism is used for opening or closing the flange mouth, when the vacuum safety valve is overhauled, closes the flange mouth through overhauling switch mechanism, can disconnect the communication of vacuum safety valve and storage tank, then can carry out setting to vacuum safety valve in the exhaust port connection vacuum pump evacuation, adjusts the counterweight according to setting condition and timely adjustment check, after setting, check end, opens the flange mouth through overhauling switch mechanism, can restore the communication of vacuum safety valve and storage tank, the utility model discloses simple structure, convenient operation can carry out on -line overhauling, need not to dismount vacuum safety valve, save time and labour.

Description

Technical Field

[0001] This utility model relates to the field of vacuum safety valve technology, specifically to a vacuum safety valve that can be maintained online. Background Technology

[0002] A vacuum safety valve (i.e., a breather valve) is a valve that ensures the storage tank space is isolated from the atmosphere within a certain pressure range, while allowing communication with the atmosphere when the pressure exceeds or falls below this range. When the pressure inside the tank reaches the rated positive pressure for venting, the pressure valve opens, allowing steam to escape from the tank; when the vacuum inside the tank reaches the rated negative pressure for intake, the vacuum valve opens, allowing air to enter, preventing damage to the storage tank due to overpressure or vacuum, and reducing evaporation losses of the stored liquid. Installing a breather valve not only reduces gas emissions from the tank, thus lowering atmospheric pollution, but also prevents damage to the storage tank due to overpressure or instability due to excessive vacuum, contributing to both safety and environmental protection.

[0003] The vacuum safety valve of the LNG storage tank system is independently installed and is responsible for maintaining a certain vacuum level in the equipment. When the vacuum level exceeds a certain value, it will draw in the atmosphere. The vacuum safety valve is required to be disassembled and inspected annually according to regulations. The disassembled vacuum safety valve is sealed at the flange connecting to the storage tank, and the exhaust port is connected to a vacuum pump to adjust the valve. Based on the adjustment, the counterweight is adjusted in a timely manner to complete the calibration. However, this vacuum safety valve is located on top of a large storage tank and is quite heavy, making disassembly and maintenance very inconvenient. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide a vacuum safety valve that can isolate the suction valve and the storage tank during maintenance and perform online maintenance.

[0005] The technical solution of this utility model is to provide a vacuum safety valve with the following structure that can be maintained online:

[0006] The device includes a valve body, an exhaust assembly, and an intake assembly. The valve body has a valve cavity, and the valve body is provided with a flange, an exhaust port, and an intake port that communicate with the valve cavity. The flange is used to connect to a storage tank. The exhaust assembly and the intake assembly are respectively connected to the exhaust port and the intake port. The valve body is provided with a maintenance switch mechanism, which is used to open or close the flange.

[0007] With the above structure, the vacuum safety valve capable of online maintenance in this invention has the following advantages compared with the prior art:

[0008] When overhauling the vacuum safety valve, the connection between the vacuum safety valve and the storage tank is disconnected by closing the flange port through the maintenance switch mechanism. Then, a vacuum pump is connected to the exhaust end of the exhaust assembly, and the vacuum safety valve can be adjusted by drawing a vacuum. The counterweight is adjusted in time according to the adjustment results to complete the calibration. After the adjustment and calibration are completed, the connection between the vacuum safety valve and the storage tank is restored by opening the flange port through the maintenance switch mechanism, and the equipment returns to normal operation. This utility model has a simple structure, is easy to operate, and can be maintained online without disassembling the vacuum safety valve, saving time and effort.

[0009] Preferably, the maintenance switch mechanism includes a drive assembly and a valve core. The drive assembly is disposed on the valve body, and the valve core is disposed in the valve cavity. The drive assembly is throttle-connected to the valve core and is used to drive the valve core to open or close the flange port.

[0010] Preferably, the drive assembly includes a mounting base, a screw, and a handwheel; the top of the valve body has a through hole communicating with the valve cavity, and the through hole is coaxial with the flange opening; the mounting base is connected to the upper opening of the through hole and is coaxial with the through hole; the screw is threadedly connected to the mounting base, and one end of the screw extends into the valve cavity and is connected to the valve core, while the other end extends out of the valve body and is connected to the handwheel. The handwheel is used to drive the screw to rotate and drive the valve core to move up and down to open or close the flange opening.

[0011] By turning the handwheel, the screw is driven to rotate. The screw, in conjunction with the mounting base, drives the valve core to move up and down, thereby opening or closing the flange port and connecting or disconnecting the vacuum safety valve from the storage tank.

[0012] Preferably, the device also includes a locking assembly for locking the rotation of the handwheel.

[0013] Preferably, the locking assembly includes a chain and a padlock. A lock hole is provided on the outer peripheral wall of the mounting base. One end of the chain passes through the handwheel and the lock hole, and is connected to its other end via the padlock. This allows the valve core to be locked in position during normal operation, preventing accidental closure of the flange by the valve core.

[0014] Preferably, the suction assembly includes a valve disc, a counterweight, a guide rod, and a guide sleeve. The guide sleeve is disposed within the valve cavity and coaxially aligned with the suction port. One end of the guide rod is slidably connected within the guide sleeve, and the other end passes through the middle of the valve disc and connects to the counterweight. Initially, the valve disc covers the suction port. When the vacuum inside the tank reaches a certain level, under the influence of the atmospheric pressure difference between the inside and outside of the valve body, the valve disc overcomes the gravity of the counterweight and moves upward, allowing outside air to enter the valve body and preventing damage to the tank.

[0015] Preferably, the exhaust assembly includes an exhaust valve, a tee, and a pressure gauge, wherein the tee is connected to the exhaust port, and the exhaust valve and pressure gauge are connected to the tee. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model.

[0017] Figure 2 This is a half-sectional view of the present invention in its working state.

[0018] Figure 3 This is a half-sectional view of the present invention in the set state.

[0019] Explanation of reference numerals in the attached figures:

[0020] 1. Valve body; 11. Valve cavity; 12. Flange; 13. Exhaust port; 14. Intake port; 15. Through hole; 2. Exhaust assembly; 21. Exhaust valve; 22. Tee; 23. Pressure gauge; 3. Intake assembly; 31. Valve disc; 32. Counterweight; 33. Guide rod; 34. Guide sleeve; 4. Maintenance switch mechanism; 41. Drive assembly; 411. Mounting sleeve; 412. Screw; 413. Handwheel; 414. Lock hole; 42. Valve core. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0022] In the description of this utility model, it should be understood that the terms "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 utility model 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 utility model. At the same time, the terms "first", "second", etc., are only used to distinguish the names of various components and do not have a primary or secondary relationship. Therefore, they should not be construed as limitations on this utility model.

[0023] like Figure 1 , Figure 2 and Figure 3 As shown, this utility model discloses a vacuum safety valve that can be maintained online: it includes a valve body 1, an exhaust assembly 2 and an intake assembly 3. The valve body 1 has a valve cavity 11. The valve body 1 is provided with a flange 12, an exhaust port 13 and an intake port 14 that are connected to the valve cavity 11. The flange 12 is used to connect to a storage tank. The exhaust assembly 2 and the intake assembly 3 are respectively connected to the exhaust port 13 and the intake port 14.

[0024] The valve body 1 is also provided with a maintenance switch mechanism 4 for opening or closing the flange port 12. The maintenance switch mechanism 4 includes a drive assembly 41 and a valve core 42. The drive assembly 41 is disposed on the valve body 1, and the valve core 42 is disposed in the valve cavity 11. The drive assembly 41 is connected to the valve core 42 for driving the valve core 42 to open or close the flange port 12.

[0025] The drive assembly 41 includes a mounting base 411, a screw 412, and a handwheel 413. The top of the valve body 1 has a through hole 15 communicating with the valve cavity 11, and the through hole 15 is coaxially arranged with the flange port 12. The mounting base 411 is connected to the upper opening of the through hole 15 and is coaxially arranged with the through hole 15. The mounting base 411 is cylindrical, and its interior has a thread that matches the screw 412. The screw 412 is threadedly connected inside the mounting base 411, and one end of the screw 412 extends into the valve cavity 11 and is connected to the valve core 42, while the other end extends out of the valve body 1 and is connected to the handwheel 413. By rotating the handwheel 413 circumferentially, the screw 412 is driven to rotate. The screw 412, in cooperation with the thread inside the mounting base 411, drives the valve core 42 to move up and down, thereby opening or closing the flange port 12, realizing the connection or disconnection of the vacuum safety valve and the storage tank.

[0026] The drive component 41 can also be a linear motor. The output end of the linear motor is connected to the valve core 42, which can drive the valve core 42 to move up and down, and can also open or close the flange port 12.

[0027] The vacuum safety valve of this invention, which is capable of online maintenance, also includes a locking assembly for locking the rotation of the handwheel 413. The locking assembly includes a chain and a padlock (not shown in the figure). A locking hole 414 is provided on the outer peripheral wall of the mounting base 411. One end of the chain passes through the handwheel 413 and the locking hole 414, and is connected to its other end via the padlock. This locks the position of the valve core 42 during normal operation, preventing the valve core 42 from accidentally closing the flange port 12 and causing an accident.

[0028] like Figure 2 and Figure 3 As shown, the air intake assembly 3 includes a valve disc 31, a counterweight 32, a guide rod 33, and a guide sleeve 34. The guide sleeve 34 is disposed in the valve cavity 11 and is coaxially arranged with the air intake port 14. One end of the guide rod 33 is slidably connected in the guide sleeve 34, and the other end passes through the middle of the valve disc 31 and is connected to the counterweight 32. In the initial state, the valve disc 31 covers the air intake port 14 to prevent outside air from entering. When the vacuum in the storage tank reaches a certain level, under the action of the atmospheric pressure difference inside and outside the valve body 1, the valve disc 31 overcomes the gravity of the counterweight 32 and moves upward, allowing outside air to enter the valve body 1 and preventing damage to the storage tank.

[0029] The venting assembly 2 includes a venting valve 21, a three-way valve 22, and a pressure gauge 23. The three-way valve 22 is connected to the vent port 13, and the venting valve 21 and the pressure gauge 23 are connected to the three-way valve 22. The venting valve 21 can vent air to the outside when the pressure in the storage tank exceeds a set value, preventing damage to the storage tank due to overpressure. The pressure gauge 23 can monitor the pressure inside the storage tank in real time. This is existing technology and will not be described in detail here.

[0030] During maintenance of the vacuum safety valve of this invention, the connection between the vacuum safety valve and the storage tank is disconnected by turning the handwheel 413 to move the valve core 42 downward and close the flange. Then, a vacuum pump is connected to the exhaust end of the exhaust valve 21, and the valve disc 31 is activated by drawing a vacuum, allowing the vacuum safety valve to be set. The counterweight is adjusted as needed to complete the calibration. Alternatively, gas can be introduced through the exhaust port 13, and leaks can be checked by applying soapy water to the intake port 14 to inspect the sealing performance of the valve disc 31. After setting and calibration, the connection between the vacuum safety valve and the storage tank is restored by opening the flange through the maintenance switch mechanism 4, and the equipment returns to normal operation. This invention has a simple structure, is easy to operate, and allows for online maintenance without disassembling the vacuum safety valve, saving time and effort.

[0031] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A vacuum safety valve capable of online maintenance, comprising a valve body (1), an exhaust assembly (2), and an intake assembly (3), wherein the valve body (1) has a valve cavity (11), and the valve body (1) is provided with a flange (12), an exhaust port (13), and an intake port (14) communicating with the valve cavity (11), the flange (12) being used to connect to a storage tank, and the exhaust assembly (2) and the intake assembly (3) being respectively connected to the exhaust port (13) and the intake port (14); characterized in that: The valve body (1) is provided with a maintenance switch mechanism (4), which is used to open or close the flange port (12). The maintenance switch mechanism (4) includes a drive assembly (41) and a valve core (42). The drive assembly (41) is disposed on the valve body (1), and the valve core (42) is disposed in the valve cavity (11). The drive assembly (41) is connected to the valve core (42) for driving the valve core (42) to open or close the flange port (12). The drive assembly (41) includes a mounting base (411), a screw (412), and a handwheel (413); the top of the valve body (1) is provided with a through hole (15) communicating with the valve cavity (11), and the through hole (15) is coaxially arranged with the flange opening (12); the mounting base (411) is connected to the upper opening of the through hole (15), and is coaxially arranged with the through hole (15); the screw (412) is threadedly connected to the mounting base (411), and one end of the screw (412) extends into the valve cavity (11) and is connected to the valve core (42), and the other end extends out of the valve body (1) and is connected to the handwheel (413). The handwheel (413) is used to drive the screw (412) to rotate and drive the valve core (42) to move up and down to open or close the flange opening (12).

2. The vacuum safety valve capable of online maintenance according to claim 1, characterized in that: It also includes a locking assembly for locking the rotation of the handwheel (413).

3. The vacuum safety valve capable of online maintenance according to claim 2, characterized in that: The locking assembly includes a chain and a padlock. The outer peripheral wall of the mounting base (411) is provided with a lock hole (414). One end of the chain passes through the handwheel (413) and the lock hole (414) and is connected to the other end of the chain via the padlock.

4. The vacuum safety valve capable of online maintenance according to claim 1, characterized in that: The intake assembly (3) includes a valve disc (31), a counterweight (32), a guide rod (33), and a guide sleeve (34); the guide sleeve (34) is disposed in the valve cavity (11) and is coaxially arranged with the intake port (14); one end of the guide rod (33) is slidably connected in the guide sleeve (34), and the other end passes through the middle of the valve disc (31) and is connected to the counterweight (32); in the initial state, the valve disc (31) covers the intake port (14).

5. The vacuum safety valve capable of online maintenance according to claim 1, characterized in that: The exhaust assembly (2) includes an exhaust valve (21), a tee (22) and a pressure gauge (23), the tee (22) being connected to the exhaust port (13), and the exhaust valve (21) and the pressure gauge (23) being connected to the tee (22).

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