A one-way valve for LNG cylinder pressure gauge

Abstract

The utility model relates to one -way valve technical field discloses a one -way valve for LNG gas cylinder pressure gauge, including valve body, the top of valve body is provided with the connecting pipe, the inside of valve body is provided with the overhaul mechanism, the overhaul mechanism is used for preventing the leakage of gas cylinder gas when overhauling pressure gauge, the bottom of connecting pipe is provided with fixed establishment, fixed establishment is used for improving the stability of connection, the overhaul mechanism includes support frame no.

Description

Technical Field

[0001] This utility model relates to the field of one-way valve technology, and in particular to a one-way valve for use on pressure gauges on LNG cylinders. Background Technology

[0002] Against the backdrop of accelerated global energy structure transformation, the development and utilization of clean energy has become a key force driving sustainable development. LNG, or liquefied natural gas, has been widely used in many fields due to its significant advantages of being clean, efficient, and low-carbon. Whether in the transportation sector, providing power for LNG vehicles and ships, or in industrial fuel and urban gas supply, LNG plays a crucial role. As the core equipment for storing and transporting LNG, the stable maintenance and safe monitoring of the internal pressure of LNG cylinders are the key points to ensure the reliable operation of the LNG system. In the entire pressure monitoring system, the pressure gauge directly displays the pressure value and is a vital device. The one-way valve used for the pressure gauge of LNG cylinders safeguards the accuracy and safety of pressure monitoring.

[0003] Because LNG is a flammable and explosive medium, if it leaks and mixes with air to a certain concentration, it will explode upon contact with an ignition source, with unimaginable consequences. Furthermore, its extremely low temperature characteristics can cause equipment to freeze and crack, posing a serious risk of frostbite to personnel. To effectively prevent these risks, pressure monitoring systems must possess high reliability and safety to accurately reflect the internal pressure of the gas cylinder and promptly detect potential safety hazards. One-way valves, as key control components in the pressure transmission path, effectively prevent backflow of the medium, prevent impurities from entering the gas cylinder, and avoid damage to the system caused by abnormal pressure fluctuations. However, after the pressure gauge is removed for maintenance, the gas inside the cylinder will leak through the pipeline, not only causing unnecessary waste of clean energy but also posing serious safety risks. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a one-way valve for the pressure gauge on an LNG cylinder, aiming to improve the problem in the prior art where, after the pressure gauge is removed for maintenance, the gas in the cylinder will leak through the pipeline, causing not only the needless waste of clean energy but also serious safety risks.

[0005] To achieve the above objectives, this utility model adopts the following technical solution: a one-way valve for a pressure gauge on an LNG cylinder, comprising a valve body, a connecting pipe at the top of the valve body, a maintenance mechanism on the inner side of the valve body to prevent gas leakage from the cylinder during pressure gauge maintenance, a fixing mechanism at the bottom of the connecting pipe to improve connection stability, the maintenance mechanism comprising a support frame one, the outer wall of the support frame one being fixedly connected to the bottom inner side of the valve body, a spring fixedly connected to the top of the support frame one, a support platform fixedly connected to the top of the spring, a blocking plate fixedly connected to the top of the support platform, a threaded pipe one fixedly connected to the bottom of the connecting pipe, a support frame two fixedly connected to the bottom inner side of the threaded pipe one, a short column fixedly connected to the bottom of the support frame two, a sealing assembly at the top of the support platform, and a connecting assembly at the bottom of the valve body.

[0006] As a further description of the above technical solution: The fixing mechanism includes a connecting ring, the inner side of which is fixedly connected to the outer wall of the connecting pipe. A slot is provided on the top rear side of the connecting ring. A connecting sleeve is provided on the top of the outer wall of the valve body. A sliding groove is provided on the rear side of the connecting sleeve. An installation block is slidably connected to the inner wall of the sliding groove. A locking bracket is fixedly connected to the rear side of the installation block.

[0007] As a further description of the above technical solution: The sealing assembly includes a support ring, the outer wall of which is fixedly connected to the upper inner part of the valve body, and a sealing ring is fixedly connected to the bottom of the support ring.

[0008] As a further description of the above technical solution: The top of the support platform has a groove, and the bottom of the sealing ring fits against the inner wall of the groove.

[0009] As a further description of the above technical solution: The connecting assembly includes a sealing sleeve, the inner wall of which is fixedly connected to the bottom outer wall of the valve body, and a threaded pipe is fixedly connected to the bottom of the valve body.

[0010] As a further description of the above technical solution: A sealing gasket is fixedly connected to the bottom of the connecting ring, and a sealing gasket is fixedly connected to the top of the connecting sleeve. The bottom of the sealing gasket is in contact with the top of the sealing gasket.

[0011] As a further description of the above technical solution: The top left and right sides of the support frame one are fixedly connected to limit frames, and both limit frames adopt a symmetrical design.

[0012] As a further description of the above technical solution: The bottom of the short post is attached to the top of the blocking piece, and the top of the locking bracket is attached to the inside of the slot.

[0013] This utility model has the following beneficial effects: 1. In this utility model, after the one-way valve is installed, when the pressure gauge is installed to the top of the valve body through the connecting pipe, the blocking plate will move downward as the short column is continuously installed. That is, it pushes the support platform along the limit frame and moves downward while the spring is compressed, thus forming a passage. When the pressure gauge on the one-way valve is removed, the pressure of the gas in the bottle and the action of the spring will push the blocking plate upward, thus fitting with the support ring to block the gas leakage and prevent gas leakage during disassembly.

[0014] 2. In this utility model, since LNG cylinders may encounter sudden impact conditions such as bumps and collisions during transportation and use, simple threaded connections are prone to instantaneous loosening and displacement under instantaneous impact force. After the sliding locking bracket passes through the locking groove and locks with the inner side, the top of the locking bracket and the inner side of the locking groove form a multi-directional force support, preventing the failure of the passage seal and the interruption of pressure transmission caused by loose connection, and ensuring the continuous and reliable operation of the pressure monitoring system. Attached Figure Description

[0015] Figure 1 This is a perspective view of the front side of the connecting sleeve of a one-way valve for a pressure gauge on an LNG cylinder, as proposed in this utility model. Figure 2 This invention provides a schematic diagram of the connecting pipe for a one-way valve used on a pressure gauge of an LNG cylinder. Figure 3 This is a partial structural breakdown of the valve body of a one-way valve for a pressure gauge on an LNG cylinder, as proposed in this utility model. Figure 4 This is a partial structural breakdown of the support ring of a one-way valve for a pressure gauge on an LNG cylinder, as proposed in this utility model. Figure 5 This is a partial structural diagram of a support platform for a one-way valve used on a pressure gauge of an LNG cylinder, as proposed in this utility model. Figure 6 This is a partial structural diagram of the connecting ring of a one-way valve for a pressure gauge on an LNG cylinder, as proposed in this utility model.

[0016] Legend: 1. Valve body; 2. Maintenance mechanism; 201. Support frame one; 202. Spring; 203. Support platform; 204. Blocking plate; 205. Threaded pipe one; 206. Support frame two; 207. Short column; 208. Sealing assembly; 2081. Support ring; 2082. Sealing ring; 2083. Groove; 209. Connecting assembly; 2091. Sealing sleeve; 2092. Threaded pipe two; 3. Fixing mechanism; 301. Connecting ring; 302. Slot; 303. Connecting sleeve; 304. Slide groove; 305. Mounting block; 306. Clamping frame; 4. Connecting pipe; 5. Sealing gasket one; 6. Sealing gasket two; 7. Limiting frame. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Please see the appendix Figure 3 Appendix Figure 4 and attached Figure 5 The present invention provides an embodiment of a one-way valve for a pressure gauge on an LNG cylinder, comprising a valve body 1, a connecting pipe 4 at the top of the valve body 1, a maintenance mechanism 2 on the inner side of the valve body 1, the maintenance mechanism 2 being used to prevent gas leakage in the cylinder when the pressure gauge is maintained, a fixing mechanism 3 at the bottom of the connecting pipe 4, the fixing mechanism 3 being used to improve the stability of the connection, the maintenance mechanism 2 comprising a support frame 201, the outer wall of the support frame 201 being fixedly connected to the bottom inner side of the valve body 1, a spring 202 being fixedly connected to the top of the support frame 201, a support platform 203 being fixedly connected to the top of the spring 202, a blocking plate 204 being fixedly connected to the top of the support platform 203, a threaded pipe 205 being fixedly connected to the bottom of the connecting pipe 4, a support frame 206 being fixedly connected to the bottom inner side of the threaded pipe 205, a short column 207 being fixedly connected to the bottom of the support frame 206, a sealing assembly 208 at the top of the support platform 203, and a connecting assembly 209 at the bottom of the valve body 1; Specifically, a connecting pipe 4 is installed at the top of the valve body 1, which can connect to the pressure gauge. At the same time, a maintenance mechanism 2 is installed inside the valve body 1. This maintenance mechanism 2 can effectively prevent gas leakage inside the gas cylinder when the pressure gauge needs to be maintained, thereby ensuring the safety and reliability of the maintenance process. The fixing mechanism 3 can enhance the connection stability between the connecting pipe 4 and the valve body 1, preventing the connection from loosening due to vibration and external force during use. The outer wall of the support frame 201 is fixedly connected to the bottom of the inner side of the valve body 1 to ensure its stability. A blocking plate 204 is fixedly connected to the top of the support platform 203. The blocking plate 204 plays a key role in gas blocking during maintenance.

[0019] Please see the appendix Figure 2 Appendix Figure 4 and attached Figure 6 The fixing mechanism 3 includes a connecting ring 301, the inner side of which is fixedly connected to the outer wall of the connecting pipe 4. A slot 302 is provided on the rear side of the top of the connecting ring 301. A connecting sleeve 303 is provided on the top of the outer wall of the valve body 1. A sliding groove 304 is provided on the rear side of the connecting sleeve 303. An installation block 305 is slidably connected to the inner wall of the sliding groove 304. A locking bracket 306 is fixedly connected to the rear side of the installation block 305. Specifically, the connecting ring 301 is fixedly connected to the outside of the connecting pipe 4, and a slot 302 is provided at the top rear of the connecting ring 301 to facilitate engagement. The rear side of the connecting sleeve 303 is provided with a sliding groove 304, and the inner wall of the sliding groove 304 is slidably connected to the mounting block 305. The mounting block 305 is located in the sliding groove 304, and its rear side is fixedly connected to the engagement frame 306. Through the cooperation between the engagement frame 306 and the slot 302, the stability of the connection is achieved.

[0020] Please see the appendix Figure 1 Appendix Figure 2 and attached Figure 4 The bottom of the short column 207 is attached to the top of the blocking plate 204, the top of the locking bracket 306 is attached to the inner side of the slot 302, the connecting assembly 209 includes a sealing sleeve 2091, the inner wall of the sealing sleeve 2091 is fixedly connected to the bottom outer wall of the valve body 1, the bottom of the valve body 1 is fixedly connected to a threaded tube 2092, the bottom of the connecting ring 301 is fixedly connected to a sealing gasket 5, the top of the connecting sleeve 303 is fixedly connected to a sealing gasket 6, and the bottom of the sealing gasket 5 is attached to the top of the sealing gasket 6. Specifically, the bottom of the short column 207 fits against the top of the blocking plate 204 to ensure a tight seal between them, thus maintaining the stability and sealing of the structure. The inner wall of the sealing sleeve 2091 is fixedly connected to the bottom outer wall of the valve body 1 to ensure a tight seal after connection. In addition, a threaded tube 2092 is fixedly connected to the bottom of the valve body 1. This threaded tube 2092 is used to connect with other components to ensure connection with the gas cylinder. The bottom and top of the sealing gasket 5 and the sealing gasket 6 fit against each other to form a double sealing structure, which improves the sealing performance of the entire structure and ensures a good sealing effect under various working conditions.

[0021] Please see the appendix Figure 1 Appendix Figure 4 and attached Figure 5 The top left and right sides of the support frame 201 are fixedly connected to the limit frame 7. The two limit frames 7 are symmetrically designed, and the side furthest from each other is fixedly connected to the inner wall of the valve body 1. The sealing assembly 208 includes a support ring 2081. The outer wall of the support ring 2081 is fixedly connected to the upper middle part of the inner side of the valve body 1. The bottom of the support ring 2081 is fixedly connected to a sealing ring 2082. The top of the support platform 203 is provided with a groove 2083. The bottom of the sealing ring 2082 fits against the inner wall of the groove 2083. Specifically, the top left and right sides of the support frame 201 are fixedly connected to limit frames 7. These two limit frames 7 ensure the balance and stability of the structure during adjustment. The outer wall of the support ring 2081 is fixedly connected to the upper middle part of the inner side of the valve body 1 to ensure that it will not be displaced during use. The bottom of the support ring 2081 is fixedly connected to a sealing ring 2082, which can fit with the groove 2083 when the support platform 203 is raised to form a sealing structure and effectively improve the sealing performance.

[0022] Working principle: Before the one-way valve was installed, the gas in the cylinder would leak out through the pipeline after the pressure gauge was removed. After the one-way valve was installed, when the pressure gauge was installed to the top of the valve body 1 through the connecting pipe 4, the continuous installation of the short column 207 would cause the blocking plate 204 to move downward, that is, push the support platform 203 along the limit frame 7 and move downward while the spring 202 is compressed, thus forming a passage. When the pressure gauge on the one-way valve is removed, due to the pressure of the gas in the cylinder and the action of the spring 202, the blocking plate 204 will be pushed upward, thus fitting with the support ring 2081 to block the gas leakage. It can complete the sealing at the moment the pressure gauge is removed, avoiding gas leakage during disassembly. At the same time, the sealing reliability is high. The fit between the blocking plate 204 and the support ring 2081 is protected by both gas pressure and the force of the spring 202. Even when the cylinder pressure fluctuates, it can still maintain the seal and eliminate the risk of leakage. When connecting pipe 4 to valve body 1 via threaded pipe 205, the sliding locking bracket 306 passes through the locking groove 302, and then the connecting ring 301 is rotated to lock the top of the locking bracket 306 with the inner side of the locking groove 302, preventing the threads from loosening during operation and further improving the stability of the connection. Since LNG cylinders may encounter sudden impact conditions such as bumps and collisions during transportation and use, simple threaded connections are prone to instantaneous loosening and displacement under instantaneous impact force. After the sliding locking bracket 306 passes through the locking groove 302 and locks with the inner side, the top of the locking bracket 306 and the inner side of the locking groove 302 form a multi-directional force support, preventing the failure of the passage seal and the interruption of pressure transmission caused by loose connection, and ensuring the continuous and reliable operation of the pressure monitoring system.

[0023] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A one-way valve for a pressure gauge on an LNG cylinder, comprising a valve body (1), characterized in that: A connecting pipe (4) is provided at the top of the valve body (1), and a maintenance mechanism (2) is provided on the inner side of the valve body (1). The maintenance mechanism (2) is used to prevent gas leakage in the gas cylinder when the pressure gauge is being maintained. A fixing mechanism (3) is provided at the bottom of the connecting pipe (4). The fixing mechanism (3) is used to improve the stability of the connection. The maintenance mechanism (2) includes a support frame one (201), the outer wall of the support frame one (201) is fixedly connected to the inner bottom of the valve body (1), a spring (202) is fixedly connected to the top of the support frame one (201), a support platform (203) is fixedly connected to the top of the spring (202), a blocking plate (204) is fixedly connected to the top of the support platform (203), a threaded pipe one (205) is fixedly connected to the bottom of the connecting pipe (4), a support frame two (206) is fixedly connected to the inner bottom of the threaded pipe one (205), a short column (207) is fixedly connected to the bottom of the support frame two (206), a sealing assembly (208) is provided on the top of the support platform (203), and a connecting assembly (209) is provided on the bottom of the valve body (1).

2. A one-way valve for a pressure gauge on an LNG cylinder according to claim 1, characterized in that: The fixing mechanism (3) includes a connecting ring (301), the inner side of which is fixedly connected to the outer wall of the connecting pipe (4). A slot (302) is provided on the rear side of the top of the connecting ring (301). A connecting sleeve (303) is provided on the top of the outer wall of the valve body (1). A sliding groove (304) is provided on the rear side of the connecting sleeve (303). An installation block (305) is slidably connected to the inner wall of the sliding groove (304). A locking bracket (306) is fixedly connected to the rear side of the installation block (305).

3. A one-way valve for a pressure gauge on an LNG cylinder according to claim 1, characterized in that: The sealing assembly (208) includes a support ring (2081), the outer wall of which is fixedly connected to the upper inner part of the valve body (1), and a sealing ring (2082) is fixedly connected to the bottom of the support ring (2081).

4. A one-way valve for a pressure gauge on an LNG cylinder according to claim 3, characterized in that: The top of the support platform (203) is provided with a groove (2083), and the bottom of the sealing ring (2082) fits against the inner wall of the groove (2083).

5. A one-way valve for a pressure gauge on an LNG cylinder according to claim 1, characterized in that: The connecting assembly (209) includes a sealing sleeve (2091), the inner wall of which is fixedly connected to the bottom outer wall of the valve body (1), and the bottom of the valve body (1) is fixedly connected to a threaded pipe (2092).

6. A one-way valve for a pressure gauge on an LNG cylinder according to claim 2, characterized in that: The bottom of the connecting ring (301) is fixedly connected to a sealing gasket one (5), and the top of the connecting sleeve (303) is fixedly connected to a sealing gasket two (6). The bottom of the sealing gasket one (5) and the top of the sealing gasket two (6) are in contact.

7. A one-way valve for a pressure gauge on an LNG cylinder according to claim 1, characterized in that: The top left and right sides of the support frame 1 (201) are fixedly connected to the limit frame (7), and the two limit frames (7) are both designed symmetrically.

8. A one-way valve for a pressure gauge on an LNG cylinder according to claim 2, characterized in that: The bottom of the short post (207) is attached to the top of the blocking piece (204), and the top of the locking bracket (306) is attached to the inside of the slot (302).

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