Reverse liquid feeding mechanism for storage tank of liquefaction plant

Abstract

The utility model relates to the field of liquefaction plant storage tanks, in particular to a back-conveying liquid inlet mechanism of a liquefaction plant storage tank. The utility model aims to solve the technical problems that when the internal pressure of the storage tank is abnormally increased and exceeds a safety design range, if an air source is not cut off in time, the storage tank is possibly broken and leaks, and the safety of the surrounding environment is influenced. If serious leakage occurs outside the storage tank, especially under the condition that a leakage point is difficult to position or repair quickly, if a gas source cannot be cut off in time, a large amount of liquefied natural gas leaks, fire disasters or explosions are caused, and meanwhile follow-up first-aid repair work is inconvenient. Comprising a storage tank, one end of the storage tank is fixedly connected with a closing valve through a locking bolt, the other side of the closing valve is fixedly connected with a disconnecting valve through a locking bolt, and the disconnecting valve comprises a shell. The design of the cut-off valve can quickly respond to the pressure change inside or outside the storage tank, the gas transmission channel is automatically closed, and safety accidents caused by leakage of liquefied natural gas (LNG) are prevented.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of liquefied factory storage tank, especially to the liquefied factory storage tank reverse feed mechanism. BACKGROUND

[0002] Liquefied natural gas (LNG) is a clean energy source with significant advantages in environmental protection. It produces less pollution when burned, which helps reduce environmental pollution and greenhouse gas emissions. The liquefied factory storage tank reverse feed mechanism is one of the key equipment in the liquefied natural gas (LNG) factory, which is responsible for safely and efficiently feeding the liquefied natural gas in the tank car back to the factory's storage tank. With the growing demand for liquefied natural gas and the continuous progress of technology, this mechanism will develop towards higher efficiency, safety and environmental protection.

[0003] In the future, more innovative technologies and design solutions may emerge to meet the higher requirements of the liquefied natural gas industry for the reverse feed mechanism. In the prior art, when the internal pressure of the storage tank abnormally rises beyond the safe design range, if the gas source is not cut off in time, it may cause the storage tank to rupture and leak, affecting the safety of the surrounding environment; if a serious leak occurs outside the storage tank, especially if the leak point is difficult to quickly locate or repair, if the gas source cannot be cut off in time, it will cause a large amount of liquefied natural gas to leak, causing a fire or explosion, and it is not convenient for subsequent repair work. SUMMARY

[0004] (1) Technical problem to be solved

[0005] The utility model discloses in order to overcome when the internal pressure of the storage tank abnormally rises beyond the safe design range, if the gas source is not cut off in time, it may cause the storage tank to rupture and leak, affecting the safety of the surrounding environment; if a serious leak occurs outside the storage tank, especially if the leak point is difficult to quickly locate or repair, if the gas source cannot be cut off in time, it will cause a large amount of liquefied natural gas to leak, causing a fire or explosion, and it is not convenient for subsequent repair work, the technical problem to be solved of the utility model is to provide the liquefied factory storage tank reverse feed mechanism.

[0006] (2) Technical scheme

[0007] In order to solve the above technical problems, the utility model provides such liquefied factory storage tank reverse feed liquid mechanism, including the storage tank, the one end of storage tank is connected with locking bolt slidingly, the storage tank is connected with closing valve through locking bolt fixedly, the other side of closing valve is connected with break valve through locking bolt fixedly, break valve includes the shell, the shell is connected with locking bolt slidingly, the inside of shell is fixedly connected with two intercommunication boards, the section of intercommunication board is circular, the side of intercommunication board is equipped with six round holes, the inside of intercommunication board is connected with trigger shaft slidingly, the one end of trigger shaft is equipped with square sliding slot, square sliding slot is rotatably connected with trigger wheel through the pivot of trigger wheel, the section of trigger wheel is circular, the other end of trigger shaft is fixedly connected with sealing plate, the diameter of sealing plate is less than intercommunication board, the side of sealing plate close to intercommunication board is fixedly connected with six sealing balls, the diameter of sealing ball is greater than the round hole of intercommunication board, the outside of trigger shaft is fixedly connected with pressing plate, the section of pressing plate is circular, the outside of trigger shaft and between pressing plate and intercommunication board is equipped with sealing spring.

[0008] Preferably, the break valve further comprises a valve cover, the valve cover is fixedly connected with the shell, the section of the valve cover is circular, a square hole is formed on the upper surface of the valve cover, a valve rod is slidingly connected in the square hole, the section of the valve rod is square, reset handles are fixedly connected on both sides of the upper end of the valve rod, two trigger blocks are fixedly connected on both sides of the lower end of the valve rod, the section of the trigger block is trapezoidal.

[0009] Preferably, the break valve further comprises a valve core, the valve core is fixedly connected with the valve rod, the valve core is slidingly connected with the shell, nitrogen is filled between the valve core and the valve cover, the section of the valve core is circular, a circular ring groove is formed on the arc surface of the valve core, a sealing ring is rotatably connected in the circular ring groove, the sealing ring is slidingly connected with the shell.

[0010] Preferably, the break valve further comprises two guide rails, the lower surface of the guide rail is fixedly connected with the upper surface of the valve core, the section of the guide rail is square, a cross-shaped sliding slot is formed on the upper surface of the guide rail, a support rod is slidingly connected in the cross-shaped sliding slot through a pivot, a support base is rotatably connected on the other end of the support rod through a pivot, the other end of the support base is fixedly connected with the inner surface of the shell, two tension springs are fixedly connected between the upper surface of the valve core and the lower surface of the valve cover, a communication pipe is connected on the upper end side of the shell, a pressure gauge is connected on the end of the communication pipe.

[0011] Preferably, the closing valve comprises a valve body, one end of the valve body is fixedly connected with the storage tank through the locking bolt, the other end of the valve body is fixedly connected with the shell through the locking bolt, the side surface of the valve body is rotationally connected with a closing shaft, the upper end of the closing shaft is fixedly connected with a closing handle, the lower end of the closing shaft and located in the valve body is fixedly connected with a closing ball, the closing ball is rotationally connected with the valve body, and the side surface of the closing ball is provided with a circular through hole.

[0012] Preferably, the lower surface of the storage tank is fixedly connected with two supports, the other end of the disconnecting valve is fixedly connected with another closing valve through the locking bolt, and the other end of the other closing valve is fixedly connected with a connecting pipe through the locking bolt.

[0013] (3) Beneficial effects

[0014] 1. The design of the disconnecting valve can quickly respond to the pressure changes inside or outside the storage tank, automatically close the gas delivery channel, prevent safety accidents caused by liquefied natural gas (LNG) leakage, not only protect the facilities and staff in the factory, but also reduce the impact on the surrounding environment, and the reset handle can be reset by simple manual operation, simplifying the operation process and facilitating user use.

[0015] 2. The valve core can monitor the pressure inside the shell and push the sealing plate to close or open the channel according to the pressure change, which ensures that the storage tank can respond in time under abnormal conditions and maintain safe operating conditions. The mechanism can automatically cut off the gas supply path when the pressure exceeds the standard, without manual intervention to complete self-protection in emergency situations, improving the ability to respond to unexpected situations. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 It is a schematic diagram of the locking bolt of the utility model;

[0018] Figure 3 It is a schematic diagram of the disconnecting valve structure of the utility model;

[0019] Figure 4 It is a schematic diagram of the valve core and support rod structure of the utility model;

[0020] Figure 5 It is a sectional view of the valve core and sealing ring of the utility model;

[0021] Figure 6 It is a schematic diagram of the internal structure of the ball valve of the utility model.

[0022] The marks in the drawings are: 1- tank, 2- support, 3- closing valve, 301- valve body, 302- closing ball, 303- closing shaft, 304- closing handle, 4- connecting pipe, 5- disconnecting valve, 501- shell, 502- valve cover, 503- pressure gauge, 504- communication pipe, 505- valve rod, 506- trigger block, 507- reset handle, 508- trigger wheel, 509- trigger shaft, 510- pressing plate, 511- sealing spring, 512- communication plate, 513- sealing plate, 514- sealing ball, 515- valve core, 516- tension spring, 517- guide rail, 518- support rod, 519- support, 520- sealing ring, 6- locking bolt. DETAILED DESCRIPTION

[0023] The utility model will be further explained in connection with the drawings and examples.

[0024] Example 1

[0025] The liquefied gas plant tank reverse input liquid mechanism, as shown in Figure 1 、 Figure 2 、 Figure 3 The tank 1 is slidably connected with the locking bolt 6 at one end, and the closing valve 3 is fixedly connected with the locking bolt 6 through the tank 1. By setting the closing valve 3, the equipment pipeline and the tank 1 can be independently closed, which is convenient for the maintenance of the equipment pipeline and the tank 1. The other side of the closing valve 3 is fixedly connected with the disconnecting valve 5 through the locking bolt 6. By setting the disconnecting valve 5, the flow of liquefied natural gas can be quickly disconnected according to the pressure change in the equipment pipeline and the tank, so as to prevent the leakage of liquefied natural gas and affect the safety of the surrounding environment. The disconnecting valve 5 comprises a shell 501, the shell 501 is slidably connected with the locking bolt 6, the inner side of the shell 501 is fixedly connected with two communication plates 512, the cross section of the communication plate 512 is circular, six circular through holes are formed in the side surface of the communication plate 512, the trigger shaft 509 is slidably connected to the inner side of the communication plate 512, a square sliding groove is formed at one end of the trigger shaft 509, the trigger wheel 508 is rotatably connected to the square sliding groove through a rotating shaft, the cross section of the trigger wheel 508 is circular, the other end of the trigger shaft 509 is fixedly connected with the sealing plate 513, the diameter of the sealing plate 513 is smaller than that of the communication plate 512, six sealing balls 514 are fixedly connected to the side surface of the sealing plate 513 close to the communication plate 512, the diameter of the sealing ball 514 is larger than that of the circular through hole of the communication plate 512, the material of the sealing ball 514 is rubber, the outer side of the trigger shaft 509 is fixedly connected with the pressing plate 510, the cross section of the pressing plate 510 is circular, and the sealing spring 511 is sleeved between the outer side of the trigger shaft 509 and the communication plate 512.

[0026] As shown in Figure 3As shown, the disconnect valve 5 further comprises a valve cover 502 fixedly connected with the shell 501, the cross section of the valve cover 502 is circular, a square through hole is formed on the upper surface of the valve cover 502, a valve rod 505 is slidably connected in the square through hole, the cross section of the valve rod 505 is square, reset handles 507 are fixedly connected on both sides of the upper end of the valve rod 505, trigger blocks 506 are fixedly connected on both sides of the lower end of the valve rod 505, the cross section of the trigger blocks 506 is trapezoidal, and a trigger wheel 508 moves along the edge of the trigger blocks 506 to open or close the internal passage of the shell 501.

[0027] As shown in the drawings, Figure 5 The disconnect valve 5 further comprises a valve core 515 fixedly connected with the valve rod 505, the valve core 515 is slidably connected with the shell 501, the valve core 515 monitors the internal pressure of the shell 501 and pushes the sealing plate 513 to close the internal passage of the shell 501 through a trigger shaft 509, the cross section of the valve core 515 is circular, nitrogen is filled between the valve core 515 and the valve cover 502, and a circular annular groove is formed on the arc-shaped side surface of the valve core 515, a sealing ring 520 is rotatably connected in the circular annular groove, and the sealing ring 520 is slidably connected with the shell 501.

[0028] As shown in the drawings, Figure 4 The disconnect valve 5 further comprises two guide rails 517, the lower surface of the guide rail 517 is fixedly connected with the upper surface of the valve core 515, the cross section of the guide rail 517 is square, a cross-shaped sliding groove is formed on the upper surface of the guide rail 517, a support rod 518 is slidably connected in the cross-shaped sliding groove through a rotating shaft, the support rod 518 provides a certain support force for the valve core 515 to prevent the valve core 515 from closing the internal passage of the shell 501 due to pressure fluctuation of the storage tank 1 and equipment pipeline, the other end of the support rod 518 is rotatably connected with a support base 519 through a rotating shaft, the other end of the support base 519 is fixedly connected with the inner side surface of the shell 501, two tension springs 516 are fixedly connected between the upper surface of the valve core 515 and the lower surface of the valve cover 502, a communication pipe 504 is communicated with the upper end side surface of the shell 501, and a pressure gauge 502 is connected at the end of the communication pipe 504.

[0029] As shown in the drawings, Figure 6 The closing valve 3 comprises a valve body 301, one end of the valve body 301 is fixedly connected with the storage tank 1 through a locking bolt 6, the other end of the valve body 301 is fixedly connected with the shell 501 through a locking bolt 6, a closing shaft 303 is rotatably connected with the side surface of the valve body 301, a closing handle 304 is fixedly connected with the upper end of the closing shaft 303, a closing ball 302 is fixedly connected with the lower end of the closing shaft 303 and located in the valve body 301, the closing ball 302 is rotatably connected with the valve body 301, and a circular through hole is formed on the side surface of the closing ball 302.

[0030] As shown in the drawings, Figure 1As shown, the lower surface of the storage tank 1 is fixedly connected with two supports 2, the supports 2 provide support for the storage tank 1, prevent the storage tank 1 from displacement, the other end of the cut-off valve 5 is fixedly connected with another closing valve 3 through the locking bolt 6, the other end of the other closing valve 3 is fixedly connected with the connecting pipe 4 through the locking bolt 6, the connecting pipe 4 can be connected with the unloading hose of the liquefied natural gas tank truck through the locking bolt 6.

[0031] Working principle: when the mechanism works, the locking bolt 6 will be connected through the storage tank 1, the closing valve 3, the cut-off valve 5 and the connecting pipe 4, when the liquefied natural gas tank truck arrives at the factory, the unloading hose is communicated with the connecting pipe 4, the liquefied natural gas tank truck is started, the liquefied natural gas in the liquefied natural gas tank truck is input into the unloading hose through the centrifugal pump, the liquefied natural gas enters the storage tank 1 through the unloading hose, the connecting pipe 4, the closing valve 3 and the cut-off valve 5, and is stored in the storage tank 1, when the internal pressure of the storage tank 1 rises beyond the standard requirement, the cut-off valve 5 is started to close the internal gas conveying passage, preventing the pressure from being too large, causing the storage tank 1 to rupture and leak, affecting the safety of the surrounding environment; when leakage occurs outside the storage tank 1, the cut-off valve 5 is started to close the internal gas conveying passage, preventing a large amount of liquefied natural gas from leaking, causing a fire or explosion, at the same time, facilitating subsequent repair work, when the equipment pipeline is repaired, one side of the closing valve 3 can be closed according to the repair requirement, the storage tank 1 and the pipeline leakage repair time are shortened, and the liquefied natural gas leakage is reduced.

[0032] When the internal pressure of the storage tank 1 rises beyond the standard requirement, the internal pressure of the storage tank 1 rises at the same time, the internal pressure of the housing 501 of the cut-off valve 5 rises, under the action of the sealing ring 520, the internal pressure of the housing 501 rises and drives the valve core 515 to move upward, the valve core 515 moves upward and compresses the tension spring 516, the valve core 515 moves upward and pushes the nitrogen on the upper side into the communication pipe 504, the pressure gauge 503 displays the pressure in the communication pipe 504 in real time, the valve core 515 moves upward and drives the support rod 518 to slide in the guide rail 517, the valve core 515 moves upward and drives the valve rod 505 to move upward, the valve rod 505 moves upward and drives the two trigger blocks 506 to move upward, the two trigger blocks 506 move upward and are out of contact with the two trigger wheels 508, the sealing spring 511 releases pressure and drives the two pressure plates 510 to move towards each other, the two pressure plates 510 move towards each other and drive the two trigger shafts 509 to move towards each other, the two trigger shafts 509 move towards each other and pull the two sealing plates 513 to slide towards the communication plate 512, the sealing plate 513 slides towards the communication plate 512 and drives the sealing ball 514 to close the circular through hole of the communication plate 512, at this time, the two ends of the internal passage of the housing 501 are closed, preventing the liquefied natural gas from continuing to enter the storage tank 1, causing the storage tank 1 to rupture and leak, and affecting the safety of the surrounding environment.

[0033] When the outside of the storage tank 1 leaks, the internal pressure of the storage tank 1 and the equipment pipeline drops, driving the internal pressure of the shell 501 of the disconnection valve 5 to drop. Under the action of the sealing ring 520, the internal pressure of the shell 501 drives the valve core 515 to move downward, stretching the tension spring 516. The downward movement of the valve core 515 reduces the pressure in the communication pipe 504, and the pressure gauge 503 displays the pressure in the communication pipe 504 in real time. The downward movement of the valve core 515 drives the support rod 518 to slide in the guide rail 517, and the downward movement of the valve core 515 drives the valve rod 505 to move downward, driving the two trigger blocks 506 to move downward and disengage from the two trigger wheels 508. The sealing spring 511 releases pressure to drive the two pressure plates 510 to move towards each other, driving the two trigger shafts 509 to move towards each other, pulling the two sealing plates 513 to slide towards the communication plate 512. The sliding of the sealing plate 513 towards the communication plate 512 drives the sealing ball 514 to close the circular hole of the communication plate 512. At this time, the two ends of the internal passage of the shell 501 are closed, preventing the liquefied natural gas in the storage tank 1 and the equipment pipeline from flowing to the leakage site, preventing a large amount of liquefied natural gas from leaking, causing a fire or explosion, and facilitating subsequent repair work.

[0034] When the pressure in the storage tank 1 returns to normal standard and the leakage site is repaired, pull the reset handle 507 upward or press it downward to reset the disconnection valve 5. The reset handle 507 drives the valve rod 505 to move upward and downward, driving the valve core 515 to move upward and downward. The upward and downward movement of the valve core 515 drives the support rod 518 to slide in the guide rail 517, providing a certain support force for the valve core 515 to prevent the valve core 515 from closing the internal passage of the shell 501 due to pressure fluctuations in the storage tank 1 and the equipment pipeline. The upward and downward movement of the valve core 515 resets the tension spring 516. The upward and downward movement of the valve rod 505 drives the two trigger blocks 506 to move upward and downward, driving the two trigger wheels 508 to slide in the opposite direction. The reverse sliding of the two trigger wheels 508 drives the two trigger shafts 509 to slide in the opposite direction, driving the two sealing plates 513 to slide in the opposite direction. The reverse sliding of the two sealing plates 513 drives the sealing ball 514 to disengage from the circular hole of the communication plate 512. At this time, the two ends of the internal passage of the shell 501 are opened, and the liquefied natural gas can continue to be delivered to the storage tank 1.

[0035] When the device pipeline is repaired, the closing handle 304 is twisted by 90 degrees, the closing handle 304 is rotated by 90 degrees to drive the closing shaft 303 to rotate by 90 degrees, the closing shaft 303 is rotated by 90 degrees to drive the closing ball 302 to rotate by 90 degrees, the closing ball 302 is rotated by 90 degrees to close the internal passage of the valve body 301, preventing the liquefied natural gas from continuing to flow to the repair site, affecting the repair work, after the repair of the device pipeline is completed, the closing handle 304 is twisted by 90 degrees in the opposite direction, the closing handle 304 is reversely rotated by 90 degrees to drive the closing shaft 303 to reversely rotate by 90 degrees, the closing shaft 303 is reversely rotated by 90 degrees to drive the closing ball 302 to reversely rotate by 90 degrees, the closing ball 302 is reversely rotated by 90 degrees to open the internal passage of the valve body 301, at this time, the liquefied natural gas conveying operation of the storage tank 1 can be continued.

[0036] The above-described embodiments only express the preferred embodiments of the present application, and the description is more specific and detailed, but it should not be understood as limiting the scope of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications, improvements and substitutions can be made, which all belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A liquid loading mechanism for a liquefied gas plant storage tank characterized by, The utility model provides a kind of valve, including tank (1), one end of the tank (1) is slidably connected with locking bolt (6), the tank (1) is fixedly connected with closing valve (3) by locking bolt (6), the other side of the closing valve (3) is fixedly connected with disconnecting valve (5) by the locking bolt (6), the disconnecting valve (5) includes shell (501), the shell (501) is slidably connected with the locking bolt (6), the inner side of the shell (501) is fixedly connected with two symmetrical communication plates (512), the section of the communication plate (512) is circular, six circular through holes are formed in the side of the communication plate (512), trigger shaft (509) is slidably connected to the inner side of the communication plate (512), the one end of the trigger shaft (509) is provided with square slide groove, square slide groove is rotatably connected with trigger wheel (508) by rotating shaft, the section of the trigger wheel (508) is circular, the other end of the trigger shaft (509) is fixedly connected with sealing plate (513), the diameter of the sealing plate (513) is less than the communication plate (512), six sealing balls (514) are fixedly connected to the side of the sealing plate (513) close to the communication plate (512), the diameter of the sealing ball (514) is greater than the circular through hole of the communication plate (512), the outer side of the trigger shaft (509) is fixedly connected with pressing plate (510), the section of the pressing plate (510) is circular, the outer side of the trigger shaft (509) and between the pressing plate (510) and the communication plate (512) are provided with sealing spring (511).

2. The liquefied plant storage tank return-to-liquid mechanism according to claim 1, characterized by, The disconnecting valve (5) further includes a valve cover (502), the valve cover (502) is fixedly connected with the shell (501), the section of the valve cover (502) is circular, a square through hole is formed in the upper surface of the valve cover (502), a valve stem (505) is slidably connected in the square through hole, the section of the valve stem (505) is square, a reset handle (507) is fixedly connected to both sides of the upper end of the valve stem (505), two trigger blocks (506) are symmetrically fixedly connected to both sides of the lower end of the valve stem (505), the section of the trigger block (506) is trapezoidal.

3. The liquefied plant storage tank return-to-liquid mechanism according to claim 2, characterized by, The disconnecting valve (5) further includes a valve core (515), the valve core (515) is fixedly connected with the valve stem (505), the valve core (515) is slidably connected with the shell (501), nitrogen is filled between the valve core (515) and the valve cover (502), the section of the valve core (515) is circular, a circular annular groove is formed in the arc-shaped side of the valve core (515), a sealing ring (520) is rotatably connected in the circular annular groove, the sealing ring (520) is slidably connected with the shell (501).

4. The liquefied plant storage tank return-to-liquid mechanism according to claim 3, characterized by, The disconnecting valve (5) further comprises two guide rails (517), the lower surface of the guide rail (517) is fixedly connected with the upper surface of the valve core (515), the section of the guide rail (517) is square, the upper surface of the guide rail (517) is provided with a cross-shaped sliding groove, a support rod (518) is slidably connected in the cross-shaped sliding groove through a rotating shaft, the other end of the support rod (518) is rotatably connected with a support base (519) through a rotating shaft, the other end of the support base (519) is fixedly connected with the inner side of the shell (501), the upper surface of the valve core (515) is fixedly connected with the lower surface of the valve cover (502) with two tension springs (516), the upper end side of the shell (501) is communicated with a communication pipe (504), and the end of the communication pipe (504) is connected with a pressure gauge (503).

5. The liquefied plant storage tank return-to-liquid mechanism of claim 4, wherein, The closing valve (3) comprises a valve body (301), one end of the valve body (301) is fixedly connected with the storage tank (1) through the locking bolt (6), the other end of the valve body (301) is fixedly connected with the shell (501) through the locking bolt (6), the side of the valve body (301) is rotatably connected with a closing shaft (303), the upper end of the closing shaft (303) is fixedly connected with a closing handle (304), the lower end of the closing shaft (303) and located in the valve body (301) is fixedly connected with a closing ball (302), the closing ball (302) is rotatably connected with the valve body (301), and the side of the closing ball (302) is provided with a circular through hole.

6. The liquefied plant storage tank return-to-liquid mechanism of claim 5, wherein, The lower surface of the storage tank (1) is fixedly connected with two supports (2), the other end of the disconnecting valve (5) is fixedly connected with another closing valve (3) through the locking bolt (6), and the other end of the other closing valve (3) is fixedly connected with a connecting pipe (4) through the locking bolt (6).

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