LNG (liquefied natural gas) vehicle-mounted gas cylinder emptying valve interface safety valve device

Abstract

The utility model discloses an LNG (liquefied natural gas) vehicle-mounted gas cylinder emptying valve interface safety valve device, which relates to the technical field of LNG vehicle-mounted gas cylinders, and comprises an LNG vehicle-mounted gas cylinder main body, the upper end of the LNG vehicle-mounted gas cylinder main body is communicated and connected with a connecting pipe, the side wall of the connecting pipe is connected with an emptying valve main body, one end of the emptying valve main body is connected with a control valve, and the other end of the emptying valve main body is connected with a gas outlet of the LNG vehicle-mounted gas cylinder. The outlet pipe is placed on the supporting ring, then the threaded shaft is rotated to enable the clamping ring to be attached to the outer wall of the outlet pipe, the supporting ring and the clamping ring are matched to fix the outlet pipe, and the outlet pipe extends to the outside of the outlet groove. The device is simple in structure and convenient to use, ensures that the vehicle cannot shake or fall off in the running process, improves the safety and reliability, avoids damage caused by vehicle bumping, extends to the outside of the outlet groove, enables released gas to be away from the vehicle and personnel, and improves the operation safety.

Description

Technical Field

[0001] This utility model relates to the field of LNG vehicle-mounted gas cylinder technology, specifically to a safety valve device for the vent valve interface of an LNG vehicle-mounted gas cylinder. Background Technology

[0002] As a clean energy source, LNG is being used more and more widely in the transportation sector. LNG vehicle-mounted cylinders, as crucial equipment for storing LNG, have safety as a primary consideration in their design and use.

[0003] During the use of gas cylinders, the internal pressure may rise beyond safe limits due to factors such as increased temperature or abnormal pressure. To protect the cylinders from overpressure hazards, a safety valve is typically installed at the vent valve interface to automatically release pressure when the set value is exceeded, preventing cylinder damage or potential danger.

[0004] Traditional LNG vehicle-mounted cylinder vent valve and safety valve devices often employ a suspended installation when fixing the outlet pipe, which is inconvenient for installation and fixation. During vehicle operation, bumps and vibrations can easily cause the outlet pipe to shake or fall off, affecting not only the safety and reliability of the device but also potentially leading to gas leakage due to damage to the outlet pipe, posing safety hazards to personnel and vehicles. When the pressure inside the LNG vehicle-mounted cylinder system is too high, it is necessary to release excess gas in a timely manner to reduce system pressure and prevent cylinder explosion or damage. However, traditional vent valves and safety valve devices often cannot release gas effectively and promptly when the pressure is abnormal, and are prone to backflow after normal conditions are restored, leading to the entry of outside air.

[0005] Therefore, in view of this, we have studied and improved the existing structure to address its shortcomings, and proposed a safety valve device for the vent valve interface of an LNG vehicle gas cylinder and its safety protection method. Utility Model Content

[0006] The purpose of this utility model is to provide a safety valve device for the vent valve interface of an LNG vehicle-mounted gas cylinder, in order to solve the problems mentioned in the background art. Traditional LNG vehicle-mounted gas cylinder vent valve interface safety valve devices often use a suspended installation when fixing the outlet pipe, which is inconvenient for installation and fixation. During vehicle operation, due to bumps and vibrations, the outlet pipe is prone to shaking or falling off, which not only affects the safety and reliability of the device, but may also lead to gas leakage due to damage to the outlet pipe, posing a safety hazard to personnel and vehicles. When the pressure in the LNG vehicle-mounted gas cylinder system is too high, it is necessary to release excess gas in time to reduce the system pressure and prevent the gas cylinder from exploding or being damaged. However, traditional vent valves and safety valve devices often cannot release gas in a timely and effective manner when the pressure is abnormal, and are prone to backflow after the pressure returns to normal, resulting in the entry of outside air.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a safety valve device for the vent valve interface of an LNG vehicle-mounted gas cylinder, comprising an LNG vehicle-mounted gas cylinder body, a connecting pipe connected to the upper end of the LNG vehicle-mounted gas cylinder body, a vent valve body connected to the side wall of the connecting pipe, a control valve connected to one end of the vent valve body, a safety valve connected to one side of the control valve, and an outlet pipe connected to the outlet of the safety valve.

[0008] An installation bracket is fixedly connected to the upper end face of the LNG vehicle-mounted gas cylinder body. A clamping component for fixing the outlet pipe is provided inside the installation bracket. A spring is fixedly connected to the inner right side wall of the safety valve. A slider is fixedly connected to the end of the spring. A sealing block connected by a fixing component is provided on the inner wall of the safety valve. A valve core is slidably connected inside the control valve.

[0009] Furthermore, the clamping assembly includes a support ring fixedly connected to the lower end of the inner wall of the mounting bracket for supporting the outlet pipe, a threaded shaft threadedly connected to the inner center of the mounting bracket, and a clamping ring rotatably connected to the lower end of the threaded shaft, the clamping ring being slidably connected to the mounting bracket.

[0010] Furthermore, the outer wall of the outlet pipe is wrapped with insulating cotton, and the outer wall of the insulating cotton is wrapped with adhesive tape.

[0011] Furthermore, an annular plate is fixedly connected to the upper edge of the LNG vehicle-mounted gas cylinder body, and an outlet groove is opened through one side of the annular plate, with the outlet pipe extending to the outside of the outlet groove.

[0012] Furthermore, the fixing assembly includes a support rod fixedly connected to the inner wall of the safety valve, a sealing block fixedly connected to the other end of the support rod, a sealing groove on the right side wall of the sealing block, a sliding groove for sliding of the slider on the inner wall of the safety valve, a retaining groove on the right side wall of the slider, and a rubber ring fixedly connected to the inner wall of the retaining groove.

[0013] Furthermore, a pressure gauge is provided at the front end of the connecting pipe, and a threaded rod is rotatably connected to the upper end face of the valve core, and the threaded rod is threadedly connected to the internal center of the control valve.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] Firstly, the outlet pipe of this practical device is placed on the support ring, and then the threaded shaft is rotated to make the clamping ring fit against the outer wall of the outlet pipe. The support ring and the clamping ring are used to fix the outlet pipe and extend it to the outside of the outlet groove, ensuring that it will not shake or fall off during vehicle operation. This improves the safety and reliability of the device and avoids damage caused by vehicle bumps. At the same time, extending to the outside of the outlet groove keeps the released gas away from vehicles and personnel, improving operational safety.

[0016] Secondly, when the system pressure is too high, the vent valve is closed to release the excess gas. The pressure acts on the slider, overcoming the spring force and pushing the slider to the left along the groove. As the slider moves, the rubber ring in the groove separates from the sealing groove, thus opening the gas passage and allowing excess gas to be quickly released, reducing system pressure and allowing gas to be released through the safety valve. This prevents the gas cylinder from exploding or being damaged, improving the safety of the device. When the pressure inside the gas cylinder drops to a safe range, the spring pushes the slider to the right, returning it to its initial position. The slider and the sealing block come into close contact, and the rubber ring seals the sealing groove. The sealing block, supported by the support rod, re-seals the safety valve. The safety valve automatically closes after the pressure returns to normal, without manual intervention, preventing backflow and preventing external gas or impurities from entering the gas cylinder, thus maintaining the purity and safety of the gas inside the cylinder. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the main body of the device;

[0018] Figure 2 This is a schematic diagram of the internal connection structure of the mounting bracket;

[0019] Figure 3 A three-dimensional schematic diagram of the internal connection structure of the control valve;

[0020] Figure 4 This is a three-dimensional structural diagram of the internal connections of a safety valve.

[0021] In the diagram: 1. LNG vehicle-mounted gas cylinder body; 2. Connecting pipe; 201. Pressure gauge; 202. Vent valve body; 203. Control valve; 204. Safety valve; 205. Outlet pipe; 3. Annular plate; 4. Outlet groove; 5. Insulation cotton; 501. Adhesive tape; 6. Mounting bracket; 601. Support ring; 602. Threaded shaft; 603. Clamping ring; 7. Threaded rod; 701. Valve core; 8. Support rod; 801. Sealing block; 802. Sealing groove; 9. Spring; 901. Slider; 902. Slot; 903. Rubber ring; 10. Slide groove. Detailed Implementation

[0022] 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.

[0023] Example 1

[0024] like Figure 1 - Figure 4 As shown, an LNG vehicle-mounted gas cylinder vent valve interface safety valve device includes an LNG vehicle-mounted gas cylinder body 1. A connecting pipe 2 is connected to the upper end of the LNG vehicle-mounted gas cylinder body 1. A vent valve body 202 is connected to the side wall of the connecting pipe 2. It is used to safely release the pressure inside the gas cylinder when the gas cylinder pressure is too high or when parts need to be replaced. Specifically, the gas is rapidly discharged by opening and closing the valve. A control valve 203 is connected to one end of the vent valve body 202. The gas passage is changed by the movement of the valve core 701, thereby controlling the flow of gas. A safety valve 204 is connected to one side of the control valve 203. An outlet pipe 205 is connected to the outlet of the safety valve 204. When the pressure inside the system is too high, the safety valve 204 opens to release excess gas and the gas released by the safety valve 204 is discharged to a safe area through the outlet pipe 205.

[0025] An installation bracket 6 is fixedly connected to the upper end face of the LNG vehicle-mounted gas cylinder body 1. The installation bracket 6 is equipped with a clamping component for fixing the outlet pipe 205. A spring 9 is fixedly connected to the inner right side wall of the safety valve 204. A slider 901 is fixedly connected to the end of the spring 9. A sealing block 801 is provided on the inner wall of the safety valve 204 through the fixing component. A valve core 701 is slidably connected inside the control valve 203.

[0026] Furthermore, the clamping assembly includes a support ring 601 fixedly connected to the lower end of the inner wall of the mounting bracket 6 for supporting the outlet pipe 205. A threaded shaft 602 is threadedly connected to the center of the mounting bracket 6. A clamping ring 603 is rotatably connected to the lower end of the threaded shaft 602. The clamping ring 603 is slidably connected to the mounting bracket 6. An annular plate 3 is fixedly connected to the edge of the upper end face of the LNG vehicle-mounted gas cylinder body 1. An outlet groove 4 is opened through one side of the annular plate 3, and the outlet pipe 205 extends to the outside of the outlet groove 4. The outlet pipe 205 is placed on the support ring 601. Then, the threaded shaft 602 is rotated to make the clamping ring 603 fit against the outer wall of the outlet pipe 205. The support ring 601 and the clamping ring 603 fix the outlet pipe 205 and extend it to the outside of the outlet groove 4 to ensure that it will not shake or fall off during vehicle operation, thereby improving the safety and reliability of the device and avoiding damage caused by vehicle bumps. At the same time, extending to the outside of the outlet groove 4 keeps the released gas away from the vehicle and personnel, improving operational safety.

[0027] Furthermore, the outer wall of the outlet pipe 205 is wrapped with insulation cotton 5, and the outer wall of the insulation cotton 5 is wrapped with tape 501. The insulation cotton 5 is wrapped around the outer wall of the outlet pipe 205 to provide insulation, reduce the impact of external temperature changes on the LNG gas state inside the outlet pipe, and maintain stable gas flow. The tape 501 wrapped around the outer wall of the insulation cotton 5 can fix the insulation cotton 5 to prevent it from falling off or being damaged. At the same time, it increases the wear resistance and impact resistance of the outlet pipe 205, protecting the outlet pipe 205 from damage by the external environment.

[0028] Furthermore, the fixing assembly includes a support rod 8 fixedly connected to the inner wall of the safety valve 204, a sealing block 801 fixedly connected to the other end of the support rod 8, a sealing groove 802 on the right side wall of the sealing block 801, a sliding groove 10 for sliding the slider 901 on the inner wall of the safety valve 204, a retaining groove 902 on the right side wall of the slider 901, and a rubber ring 903 fixedly connected to the inner wall of the retaining groove 902. Under normal conditions, the safety valve 204 is in the closed state, and the sealing block 801 is firmly fixed to the inner wall of the safety valve 204 by the support rod 8. The sealing groove 802 on the right side fits tightly with the rubber ring 903 on the slider 901 to form an effective seal and prevent gas leakage. When the pressure in the system is too high, when the system is closed and discharged through the vent valve body 202, the pressure acts on the slider 901, overcoming the elastic force of the spring 9 and pushing it. The movable slider 901 moves to the left along the slide groove 10. As the slider 901 moves, the rubber ring 903 in the slot 902 separates from the sealing groove 802, thereby opening the gas passage and allowing excess gas to be discharged quickly, reducing system pressure and allowing gas to be released through the safety valve 204, preventing the gas cylinder from exploding or being damaged, and improving the safety of the device. When the pressure inside the gas cylinder drops to a safe range, the spring 9 pushes the slider 901 to move to the right and return to the initial position. The slider 901 is close to the sealing block 801, and the rubber ring 903 seals the sealing groove 802. The sealing block 801 re-seals the safety valve 204 under the support of the support rod 8. The safety valve 204 can automatically close after the pressure returns to normal without manual intervention, preventing backflow and preventing external gas or impurities from entering the gas cylinder, thus maintaining the purity and safety of the gas inside the gas cylinder.

[0029] Example 2

[0030] like Figure 1 and Figure 4 As shown, the present invention proposes an LNG vehicle-mounted gas cylinder vent valve interface safety valve device. Compared with Embodiment 1, as another embodiment of the present invention, a pressure gauge 201 is provided at the front end of the connecting pipe 2 for detecting the internal gas pressure of the LNG vehicle-mounted gas cylinder body 1, and for opening the vent valve body 202 and the control valve 203 to release pressure. The upper end face of the valve core 701 is rotatably connected to a threaded rod 7, and the threaded rod 7 is threadedly connected to the internal center of the control valve 203. By rotating the threaded rod 7, the valve core 701 slides inside the control valve 203, changing the on / off state of the gas passage, thereby controlling the gas flow and the flow rate.

[0031] The usage method includes the following steps:

[0032] Step 1: First, use the pressure gauge 201 at the front end of the connecting pipe 2 to continuously monitor the gas pressure inside the LNG vehicle-mounted gas cylinder body 1. When the gas pressure exceeds the preset safety threshold, the pressure gauge 201 will prompt the operator to release the pressure.

[0033] Step Two: Upon receiving an overpressure warning signal, the vent valve body 202 and control valve 203 are manually opened to release excess pressure in the gas cylinder. Safety valve 204 is ready; once the pressure continues to rise and reaches its set value, safety valve 204 will open, discharging excess gas to a safe area through outlet pipe 205. Specifically, the vent valve body 202 and control valve 203 are opened to release pressure. A threaded rod 7 is rotatably connected to the upper end face of valve core 701, and the threaded rod 7 is threadedly connected to the center of the control valve 203. Rotating the threaded rod 7 allows valve core 701 to slide inside the control valve 203, changing the on / off state of the gas passage and thus controlling gas flow. Under normal conditions, safety valve 204 is closed, and sealing block 801 is securely fixed to the inner wall of safety valve 204 by support rod 8. The sealing groove 802 on the right side and the rubber ring 9 on slider 901... 03. A tight fit forms an effective seal to prevent gas leakage. When the pressure in the system is too high, the vent valve body 202 is closed to release the gas. The pressure acts on the slider 901, overcoming the elastic force of the spring 9, and pushes the slider 901 to the left along the slide groove 10. As the slider 901 moves, the rubber ring 903 in the slot 902 separates from the sealing groove 802, thereby opening the gas passage and allowing excess gas to be released quickly, reducing the system pressure and allowing the gas to be released through the safety valve 204, preventing the gas cylinder from exploding or being damaged, and improving the safety of the device. When the pressure in the gas cylinder drops to a safe range, the spring 9 pushes the slider 901 to the right, returning it to the initial position. The slider 901 is close to the sealing block 801, and the rubber ring 903 seals the sealing groove 802. The sealing block 801 re-seals the safety valve 204 under the support of the support rod 8. The safety valve 204 can automatically close after the pressure returns to normal.

[0034] Working principle: First, the pressure gauge 201 at the front end of the connecting pipe 2 continuously monitors the gas pressure inside the LNG vehicle-mounted gas cylinder body 1. When the gas pressure exceeds the preset safety threshold, the pressure gauge 201 prompts the operator to release the pressure. After receiving the high pressure warning signal, the vent valve body 202 and the control valve 203 are manually opened to release the excess pressure in the gas cylinder. The safety valve 204 is ready. Once the pressure continues to rise and reaches its set value, the safety valve 204 will open, and the excess gas will be discharged to the safe area through the outlet pipe 205. Specifically, the vent valve body 202 and the control valve 203 are opened to release pressure. The upper end face of the valve core 701 is rotatably connected to the threaded rod 7, and the threaded rod 7 is threadedly connected to the internal center of the control valve 203. By rotating the threaded rod 7, the valve core 701 slides inside the control valve 203, changing the on / off state of the gas passage, thereby controlling the flow of gas. Then, under normal conditions, the safety valve 204 is in the closed state, and the sealing block 801 is firmly secured by the support rod 8. Fixed to the inner wall of safety valve 204, the sealing groove 802 on the right side fits tightly with the rubber ring 903 on slider 901, forming an effective seal to prevent gas leakage. When the pressure in the system is too high, it is discharged through the vent valve body 202. The pressure acts on slider 901, overcoming the elastic force of spring 9, and pushes slider 901 to the left along slide groove 10. As slider 901 moves, rubber ring 903 in slot 902 separates from sealing groove 802, thereby opening the gas passage, allowing excess gas to be discharged quickly, reducing system pressure, allowing gas to be released through safety valve 204, preventing gas cylinder explosion or damage, and improving the safety of the device. When the pressure in the gas cylinder drops to a safe range, spring 9 pushes slider 901 to the right, returning to the initial position. Slider 901 is close to sealing block 801, and rubber ring 903 seals with sealing groove 802. Sealing block 801 re-seals safety valve 204 under the support of support rod 8. Safety valve 204 can automatically close after the pressure returns to normal.

[0035] The embodiments of this utility model are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the utility model to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical applications of this utility model, and to enable those skilled in the art to understand this utility model and design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A safety valve device for the vent valve interface of an LNG vehicle-mounted gas cylinder, comprising an LNG vehicle-mounted gas cylinder body (1), characterized in that, The upper end of the LNG vehicle-mounted gas cylinder body (1) is connected to a connecting pipe (2), the side wall of the connecting pipe (2) is connected to a vent valve body (202), one end of the vent valve body (202) is connected to a control valve (203), one side of the control valve (203) is connected to a safety valve (204), and the outlet of the safety valve (204) is connected to an outlet pipe (205). An installation bracket (6) is fixedly connected to the upper end face of the LNG vehicle-mounted gas cylinder body (1). The installation bracket (6) is provided with a clamping assembly for fixing the outlet pipe (205). A spring (9) is fixedly connected to the inner right side wall of the safety valve (204). A slider (901) is fixedly connected to the end of the spring (9). A sealing block (801) is provided on the inner wall of the safety valve (204) and connected by a fixing assembly. A valve core (701) is slidably connected inside the control valve (203).

2. The LNG vehicle-mounted gas cylinder vent valve interface safety valve device according to claim 1, characterized in that, The clamping assembly includes a support ring (601) fixedly connected to the lower end of the inner wall of the mounting bracket (6) for supporting the outlet pipe (205), a threaded shaft (602) threadedly connected to the center of the inner wall of the mounting bracket (6), and a clamping ring (603) rotatably connected to the lower end of the threaded shaft (602), and the clamping ring (603) is slidably connected to the mounting bracket (6).

3. The LNG vehicle-mounted gas cylinder vent valve interface safety valve device according to claim 1, characterized in that, The outer wall of the outlet pipe (205) is wrapped with thermal insulation cotton (5), and the outer wall of the thermal insulation cotton (5) is wrapped with tape (501).

4. The LNG vehicle-mounted gas cylinder vent valve interface safety valve device according to claim 1, characterized in that, An annular plate (3) is fixedly connected to the upper edge of the LNG vehicle-mounted gas cylinder body (1). An outlet groove (4) is opened through one side of the annular plate (3), and an outlet pipe (205) extends to the outside of the outlet groove (4).

5. The LNG vehicle-mounted gas cylinder vent valve interface safety valve device according to claim 1, characterized in that, The fixing assembly includes a support rod (8) fixedly connected to the inner wall of the safety valve (204), a sealing block (801) fixedly connected to the other end of the support rod (8), a sealing groove (802) on the right side wall of the sealing block (801), a sliding groove (10) for sliding of the slider (901) on the inner wall of the safety valve (204), a retaining groove (902) on the right side wall of the slider (901), and a rubber ring (903) fixedly connected to the inner wall of the retaining groove (902).

6. The LNG vehicle-mounted gas cylinder vent valve interface safety valve device according to claim 1, characterized in that, A pressure gauge (201) is provided at the front end of the connecting pipe (2), and a threaded rod (7) is rotatably connected to the upper end face of the valve core (701), and the threaded rod (7) is threadedly connected to the center of the control valve (203).

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