LNG ultra-low temperature ball valve

Abstract

The utility model relates to low temperature ball valve technical field, especially a kind of LNG ultra-low temperature ball valve, including valve body, two connecting flanges are respectively communicated in the both ends of valve body, ball valve body is rotatably connected in the valve body, first vacuum groove is set up in the valve body interior, two second vacuum grooves are communicated in the first vacuum groove, filling groove is set up in the valve body interior, ball valve body is located in filling groove interior, two compensation components are equipped in the valve body interior, the compensation component includes compensation sleeve, compensation sleeve and valve body slidingly connect, the one end of compensation sleeve and the outer peripheral wall of ball valve body slidingly connect, limit groove is set up in the other end of compensation sleeve. Reduce the conduction of LNG cold quantity to outside, reduce the frost formation of valve body and the pressure fluctuation generated by medium endothermic gasification, compensate the sealing surface gap between ball valve body and compensation sleeve in real time, reduce the risk of sealing leakage, meet the stable use requirement of ball valve under LNG ultra-low temperature scene.

Description

Technical Field

[0001] This utility model relates to the field of cryogenic ball valve technology, and in particular to an LNG cryogenic ball valve. Background Technology

[0002] Liquefied natural gas (LNG) is a liquefied form of natural gas. As a clean energy source, LNG storage, transportation, and processing must be carried out in an ultra-low temperature environment of -162℃. This places stringent requirements on the low-temperature resistance and sealing reliability of key control equipment, LNG ball valves. Conventional ball valves are prone to sealing failure under ultra-low temperature conditions due to material brittleness and thermal expansion and contraction deformation. Furthermore, the transfer of cold energy to the outside through the valve body can easily cause problems such as valve body frosting and pressure fluctuations due to medium vaporization.

[0003] A search revealed Chinese patent CN119393546A, which provides a cryogenic LNG top-loading hard-seal floating ball valve. The valve ball and valve seat are separated for opening and closing through an adjustment component, which reduces friction and wear during valve ball rotation and improves the service life of the valve ball and valve seat.

[0004] However, during use, it was found that the cold energy is easily lost to the outside through the valve body, which can easily cause frost to form on the valve body surface. This can lead to pressure fluctuations in the LNG medium inside the valve due to heat absorption and vaporization, affecting system stability. In ultra-low temperature environments, components such as the valve body and valve ball will deform due to thermal expansion and contraction. When gaps appear on the sealing surface due to deformation, it can easily lead to LNG leakage risk, making it difficult to meet the requirements for ball valve use in ultra-low temperature LNG scenarios. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides an LNG cryogenic ball valve that reduces the transfer of LNG cold energy to the outside environment, reduces valve body frost formation and pressure fluctuations caused by heat absorption and vaporization of the medium, and compensates for the sealing surface gap between the ball valve body and the compensation sleeve in real time, thereby reducing the risk of sealing leakage and meeting the stable use requirements of ball valves in LNG cryogenic scenarios.

[0006] To solve the above technical problems, this utility model provides the following technical solution: an LNG cryogenic ball valve, including a valve body, with two connecting flanges respectively connected to both ends of the valve body, a ball valve body rotatably connected inside the valve body, a first vacuum groove opened inside the valve body, the first vacuum groove connected to two second vacuum grooves, a filling groove opened inside the valve body, the ball valve body located inside the filling groove, and two compensation components provided inside the valve body.

[0007] The compensation component includes a compensation sleeve, which is slidably connected to the valve body. One end of the compensation sleeve is slidably connected to the outer peripheral wall of the ball valve body, and the other end of the compensation sleeve has a limit groove. A positioning sleeve is slidably connected inside the limit groove. One end of the positioning sleeve is slidably connected to the limit groove. Multiple compensation springs are installed inside the limit groove. One end of the multiple compensation springs abuts against the positioning sleeve, and the other end of the multiple compensation springs is fixedly connected to the compensation sleeve.

[0008] Preferably, slots are provided at both ends of the valve body, and the other end of the positioning sleeve is inserted into the slots. Multiple annular grooves are provided on the positioning sleeve.

[0009] Through the above technical solution, the other end of the positioning sleeve is inserted into the slots at both ends of the valve body to form a preliminary positioning and sealing.

[0010] Preferably, a plurality of sealing rings and a saturated energy storage sealing ring are respectively installed inside the annular groove, and the outer peripheral walls of the plurality of sealing rings and the saturated energy storage sealing ring abut against the groove wall of the slot.

[0011] Through the above technical solution, the sealing ring abuts against the slot wall, and the Pansai energy storage sealing ring, through its own elasticity and built-in energy storage structure, tightly fits the slot wall. The double sealing structure prevents gap leakage and improves the reliability of the seal.

[0012] Preferably, a long neck structure is installed on the top surface of the valve body, and a drip plate is sleeved on the outer peripheral wall of the middle part of the long neck structure.

[0013] Through the above technical solution, the drip plate catches the water droplets condensing on the surface of the valve body or long neck structure, and guides the water droplets to drip down the plate, reducing the accumulation of water droplets on the outer wall of the long neck structure and their freezing into frost due to low temperature.

[0014] Preferably, a valve stem is rotatably connected inside the long neck structure, a handwheel is fixedly mounted on the top surface of the valve stem, the valve stem is fixedly connected to the ball valve body, and two sealing elements are installed at the lower end of the valve stem.

[0015] Through the above technical solution, the two seals block the gap between the valve stem and the long neck structure, preventing cold air from leaking out of the gap or external water vapor from entering the valve body.

[0016] Preferably, the bottom surface of the valve body is connected to a filling assembly, the filling assembly including a filling tube, the filling tube passing through the valve body and communicating with the filling groove.

[0017] With the above technical solution, the filling pipe passes through the valve body and connects to the filling tank, and external nitrogen gas is injected into the filling tank through the filling pipe.

[0018] Preferably, the outer wall of the valve body is connected to a suction assembly, the suction assembly including a suction tube, the suction tube being connected to a first vacuum chamber.

[0019] With the above technical solution, the suction pipe is connected to the first vacuum tank, and the external vacuum equipment performs vacuuming operation on the first vacuum tank and the connected second vacuum tank through the suction pipe.

[0020] Preferably, a connector tube is installed at one end of the filling tube and one end of the suction tube, and a valve is installed on the filling tube and the suction tube respectively.

[0021] The above technical solution facilitates quick connection between the filling tube, suction tube, and external nitrogen generator and vacuum equipment, ensuring ease of operation and sealing of the medium transport.

[0022] The beneficial effects of this invention are as follows: By utilizing the ultra-low thermal conductivity of the vacuum environment and the low thermal conductivity of nitrogen, a heat insulation barrier is formed inside the valve body, reducing the transfer of LNG cold energy to the outside, reducing valve body frost formation and pressure fluctuations caused by heat absorption and vaporization of the medium, and reducing the rate of cold energy transfer to the outside, thus facilitating LNG storage, transportation, processing, and use; When the valve body or ball valve body deforms due to thermal expansion and contraction in an ultra-low temperature environment, the compensation spring in the compensation component releases its elastic force, and the compensation spring pushes the compensation sleeve to slide towards the ball valve body, compensating the sealing surface gap between the ball valve body and the compensation sleeve in real time, ensuring sealing reliability. Even if the valve body or ball valve body deforms due to ultra-low temperature, it can still maintain a seal, reducing the risk of sealing leakage and meeting the stable use requirements of ball valves in ultra-low temperature LNG scenarios. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0024] Figure 2 This is a schematic diagram of the internal structure of the valve body of this utility model;

[0025] Figure 3 This is a schematic diagram of the first vacuum tank structure of this utility model;

[0026] Figure 4 This is a schematic diagram of the filling groove structure of this utility model;

[0027] Figure 5 This is an enlarged schematic diagram of the structure at point A of this utility model;

[0028] Figure 6 This is a schematic diagram of the positioning sleeve structure of this utility model.

[0029] In the diagram: 100, Valve body; 101, Connecting flange; 102, Long neck structure; 103, Drip plate; 104, Valve stem; 105, Handwheel; 106, Ball valve body; 107, Seal; 108, First vacuum chamber; 109, Second vacuum chamber; 110, Filling chamber; 200, Compensation assembly; 201, Compensation sleeve; 202, Limiting groove; 203, Positioning sleeve; 204, Compensation spring; 205, Circular groove; 206, Sealing ring; 207, Energy storage sealing ring; 208, Slot; 300, Filling assembly; 301, Filling tube; 400, Suction assembly; 401, Suction tube; 500, Connecting tube; 600, Valve. Detailed Implementation

[0030] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0031] like Figure 1-6 As shown, this embodiment provides an LNG cryogenic ball valve, including a valve body 100. Two connecting flanges 101 are respectively connected to both ends of the valve body 100. A ball valve body 106 is rotatably connected inside the valve body 100. A first vacuum groove 108 is opened inside the valve body 100. The first vacuum groove 108 is connected to two second vacuum grooves 109. A filling groove 110 is opened inside the valve body 100. The ball valve body 106 is located inside the filling groove 110. Two compensation components 200 are provided inside the valve body 100.

[0032] The compensation component 200 includes a compensation sleeve 201, which is slidably connected to the valve body 100. One end of the compensation sleeve 201 is slidably connected to the outer peripheral wall of the ball valve body 106. The other end of the compensation sleeve 201 has a limit groove 202. A positioning sleeve 203 is slidably connected inside the limit groove 202. One end of the positioning sleeve 203 is slidably connected to the limit groove 202. Multiple compensation springs 204 are installed inside the limit groove 202. One end of the multiple compensation springs 204 abuts against the positioning sleeve 203, and the other end of the multiple compensation springs 204 is fixedly connected to the compensation sleeve 201 respectively.

[0033] The valve body 100 has slots 208 at both ends, and the other end of the positioning sleeve 203 is inserted into the slot 208. The positioning sleeve 203 has multiple annular grooves 205. The other end of the positioning sleeve 203 is inserted into the slots 208 at both ends of the valve body 100 to form a preliminary positioning and sealing.

[0034] Multiple sealing rings 206 and energy-storing sealing rings 207 are installed inside the annular groove 205. The outer peripheral walls of the multiple sealing rings 206 and the energy-storing sealing rings 207 abut against the groove wall of the slot 208. The sealing rings 206 abut against the groove wall of the slot 208, and the energy-storing sealing rings 207, through their own elasticity and built-in energy-storing structure, tightly fit the groove wall of the slot 208. The double sealing structure prevents gap leakage and improves the reliability of the seal.

[0035] A long neck structure 102 is installed on the top surface of the valve body 100, and a drip plate 103 is sleeved on the outer peripheral wall of the middle part of the long neck structure 102. The drip plate 103 receives water droplets condensed on the surface of the valve body 100 or the long neck structure 102, and guides the water droplets to drip down along the plate, reducing the freezing of water droplets into frost due to low temperature after they accumulate on the outer wall of the long neck structure 102.

[0036] A valve stem 104 is rotatably connected inside the long neck structure 102. A handwheel 105 is fixedly installed on the top surface of the valve stem 104. The valve stem 104 is fixedly connected to the ball valve body 106. Two sealing elements 107 are installed at the lower end of the valve stem 104. The two sealing elements 107 block the gap between the valve stem 104 and the long neck structure 102 to prevent cold air from leaking from the gap or external water vapor from entering the valve body 100.

[0037] A filling component 300 is connected to the bottom surface of the valve body 100. The filling component 300 includes a filling pipe 301, which passes through the valve body 100 and is connected to the filling groove 110. The filling pipe 301 passes through the valve body 100 and is connected to the filling groove 110. External nitrogen gas is injected into the filling groove 110 through the filling pipe 301.

[0038] The outer wall of the valve body 100 is connected to a suction assembly 400, which includes a suction pipe 401. The suction pipe 401 is connected to the first vacuum tank 108. The suction pipe 401 is connected to the first vacuum tank 108, and an external vacuuming device performs a vacuuming operation on the first vacuum tank 108 and the connected second vacuum tank 109 through the suction pipe 401.

[0039] A connector pipe 500 is installed at one end of the filling pipe 301 and one end of the suction pipe 401, and a valve 600 is installed on the filling pipe 301 and the suction pipe 401, respectively. The connector pipe 500 facilitates quick connection between the filling pipe 301 and the suction pipe 401 and the external nitrogen generator and vacuum equipment, ensuring convenient operation and sealing of the medium transportation.

[0040] Working principle: The first vacuum tank 108 and the second vacuum tank 109 inside the valve body 100 are evacuated by an external vacuum pump, while nitrogen is filled into the filling tank 110 by an external nitrogen generator. By utilizing the ultra-low thermal conductivity of the vacuum environment and the low thermal conductivity of nitrogen, a heat insulation barrier is formed inside the valve body 100, which reduces the transfer of LNG cold energy to the outside, reduces frost formation on the valve body 100 and pressure fluctuations caused by heat absorption and vaporization of the medium, and reduces the rate of cold energy transfer to the outside, thus facilitating LNG storage, transportation, processing and use.

[0041] When the valve body 100 or the ball valve body 106 deforms due to thermal expansion and contraction in an ultra-low temperature environment, the compensation spring 204 in the compensation component 200 releases its elastic force. Since the positioning sleeve 203 is installed on the valve body 100 through the slot 208, the compensation spring 204 pushes the compensation sleeve 201 to slide towards the ball valve body 106, thereby compensating for the sealing surface gap between the ball valve body 106 and the compensation sleeve 201 in real time, ensuring sealing reliability. Even if the valve body 100 and the ball valve body 106 deform due to ultra-low temperature, they can still maintain a seal, reducing the risk of sealing leakage and meeting the stable use requirements of the ball valve in the ultra-low temperature LNG scenario.

[0042] The other end of the positioning sleeve 203 is inserted into the slots 208 at both ends of the valve body 100 to form a preliminary positioning and sealing. The sealing ring 206 abuts against the groove wall of the slot 208. The plug-in energy storage sealing ring 207, through its own elasticity and built-in energy storage structure, tightly fits the groove wall of the slot 208. The double sealing structure prevents gap leakage and improves the reliability of the seal.

[0043] The long neck structure 102 on the top surface of the valve body 100 extends the cold energy conduction path of the valve stem 104 inside the valve body 100, reducing the direct diffusion of LNG cold energy conducted by the valve stem 104 to the outside. The drip plate 103 receives water droplets condensed on the surface of the valve body 100 or the long neck structure 102, and guides the water droplets to drip down the plate, reducing the freezing of water droplets into frost due to low temperature after accumulating on the outer wall of the long neck structure 102, and preventing the frost layer from affecting the rotation of the valve stem 104 or aggravating the loss of cold energy.

[0044] Turning the handwheel 105 drives the ball valve body 106, which is fixedly connected to the valve stem 104, to rotate, thereby realizing the opening and closing control of the valve. The two seals 107 block the gap between the valve stem 104 and the long neck structure 102, preventing cold energy from leaking from the gap or external water vapor from entering the valve body 100.

[0045] The filling tube 301 of the filling assembly 300 passes through the valve body 100 and connects to the filling tank 110. External nitrogen is injected into the filling tank 110 through the filling tube 301. The suction tube 401 of the suction assembly 400 connects to the first vacuum tank 108. An external vacuuming device performs vacuuming operations on the first vacuum tank 108 and the connected second vacuum tank 109 through the suction tube 401. The valves 600 on the filling tube 301 and the suction tube 401 control the on / off of nitrogen injection and vacuuming, respectively. The connector tube 500 facilitates quick docking of the filling tube 301 and the suction tube 401 with the external nitrogen generator and vacuuming device, ensuring ease of operation and sealing of the medium transport.

[0046] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. An LNG cryogenic ball valve, characterized in that, include: A valve body (100) has two connecting flanges (101) connected to its two ends respectively. A ball valve body (106) is rotatably connected inside the valve body (100). A first vacuum groove (108) is provided inside the valve body (100). The first vacuum groove (108) is connected to two second vacuum grooves (109). A filling groove (110) is provided inside the valve body (100). The ball valve body (106) is located inside the filling groove (110). Two compensation components (200) are provided inside the valve body (100). The compensation component (200) includes a compensation sleeve (201), which is slidably connected to the valve body (100). One end of the compensation sleeve (201) is slidably connected to the outer peripheral wall of the ball valve body (106). The other end of the compensation sleeve (201) has a limiting groove (202). A positioning sleeve (203) is slidably connected inside the limiting groove (202). One end of the positioning sleeve (203) is slidably connected to the limiting groove (202). A plurality of compensation springs (204) are installed inside the limiting groove (202). One end of the plurality of compensation springs (204) abuts against the positioning sleeve (203), and the other end of the plurality of compensation springs (204) is fixedly connected to the compensation sleeve (201) respectively.

2. The LNG cryogenic ball valve as described in claim 1, characterized in that: The valve body (100) has slots (208) at both ends, and the other end of the positioning sleeve (203) is inserted into the slots (208). The positioning sleeve (203) has multiple annular grooves (205).

3. The LNG cryogenic ball valve as described in claim 2, characterized in that: Multiple sealing rings (206) and saturated energy storage sealing rings (207) are installed inside the annular groove (205), and the outer peripheral walls of the multiple sealing rings (206) and saturated energy storage sealing rings (207) abut against the groove wall of the slot (208).

4. The LNG cryogenic ball valve as described in claim 1, characterized in that: The valve body (100) is equipped with a long neck structure (102) on its top surface, and a drip plate (103) is sleeved on the outer peripheral wall of the middle part of the long neck structure (102).

5. The LNG cryogenic ball valve as described in claim 4, characterized in that: The long neck structure (102) is rotatably connected to a valve stem (104), a handwheel (105) is fixedly mounted on the top surface of the valve stem (104), the valve stem (104) is fixedly connected to the ball valve body (106), and two sealing elements (107) are installed at the lower end of the valve stem (104).

6. The LNG cryogenic ball valve as described in claim 1, characterized in that: The bottom surface of the valve body (100) is connected to a filling component (300), the filling component (300) includes a filling tube (301), the filling tube (301) passes through the valve body (100) and is connected to the filling groove (110).

7. The LNG cryogenic ball valve as described in claim 6, characterized in that: The outer wall of the valve body (100) is connected to a suction assembly (400), which includes a suction tube (401) and is connected to a first vacuum chamber (108).

8. The LNG cryogenic ball valve as described in claim 7, characterized in that: A connector tube (500) is installed at one end of the filling tube (301) and at one end of the suction tube (401), and a valve (600) is installed on the filling tube (301) and the suction tube (401).

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