Liquefied natural gas cylinder pressure relief device for natural gas vehicle

Abstract

A liquefied natural gas cylinder pressure relief device of a natural gas vehicle is characterized by comprising a vehicle body, a supporting frame, a gas storage tank, a pressure relief pipe and a gas return gun, and the supporting frame is arranged on the vehicle body; the gas storage tank is arranged on the vehicle body; the pressure relief pipe is arranged on the support frame, and one end of the pressure relief pipe is communicated with the gas storage tank; and the air return gun is communicated with the other end of the pressure relief pipe. During pressure relief, the gas return gun is rapidly connected with the gas cylinder exhaust port, it can be guaranteed that discharged natural gas keeps a certain distance from a vehicle without dismounting the pressure relief pipe, the safety of operators and the vehicle is guaranteed, meanwhile, convenience and rapidness are achieved, and the vehicle maintenance efficiency is greatly improved.

Description

Technical Field

[0001] This utility model relates to a natural gas discharge device, and more particularly to a depressurization device for use in natural gas cylinders of vehicles. Background Technology

[0002] Natural gas vehicles, also known as gas-powered vehicles, are cars primarily powered by combustion engines. They mainly use natural gas as fuel and are considered low-emission vehicles. Natural gas vehicles have been widely adopted both globally and domestically. Most vehicles are equipped with LNG (liquefied natural gas) cylinders for storage. To ensure safety, the safety valves and economy valves on the LNG cylinders need to be replaced or maintained periodically. Before replacement or maintenance, any residual natural gas in the LNG cylinders must be emptied.

[0003] The current operating method involves directly connecting a single air return gun to the vehicle's gas cylinder exhaust port to depressurize and vent the gas. This method has the following drawbacks:

[0004] First, the high-pressure, low-temperature natural gas is directly discharged from the side of the vehicle body, with an exhaust height of 80cm and horizontal discharge. The high pressure, low temperature, and flammability of the natural gas in the LNG cylinder pose a great safety hazard.

[0005] Secondly, each operation requires connecting the return air gun and the pressure relief pipe, and then disassembling them afterward, which is cumbersome and affects work efficiency.

[0006] Third, after maintenance, the vehicle needs to be pushed to a gas station before it can run normally because there is no fuel, which is quite troublesome.

[0007] Fourth, the emitted natural gas is relatively wasteful and cannot be effectively recycled and utilized. Utility Model Content

[0008] The technical problem to be solved by this utility model is to provide a safe and fast depressurization device for liquefied natural gas cylinders in natural gas vehicles, in light of the above-mentioned technical status.

[0009] The technical solution adopted by this utility model to solve the above-mentioned technical problem is: a liquefied natural gas cylinder depressurization device for natural gas vehicles, characterized in that it includes...

[0010] The vehicle body has a load-bearing plate and wheels located below the load-bearing plate;

[0011] A support frame is mounted on the aforementioned vehicle body;

[0012] The gas storage tank is located on the aforementioned vehicle body;

[0013] A pressure relief pipe, mounted on the aforementioned support frame and connected at one end to the aforementioned gas storage tank; and

[0014] The air return gun is connected to the other end of the aforementioned pressure relief pipe.

[0015] The support frame is equipped with a T-connector, one end of which is connected to a pressure relief pipe, one end of which is connected to a gas storage tank and equipped with a recovery valve, and the other end of which is connected to an vent pipe equipped with a vent valve. The vent pipe can be configured as upper and lower telescopic pipes, with the vent valve located on the lower telescopic pipe.

[0016] Furthermore, the vehicle is equipped with a leak alarm that can sound an alarm upon detecting a natural gas leak. When ambient natural gas is detected, the alarm will sound, allowing for timely intervention and preventing accidents. The vehicle is also equipped with a warning light. When depressurization is in progress, the warning light will flash to alert nearby personnel to the danger.

[0017] Furthermore, the vehicle body is equipped with handles for easy movement.

[0018] Furthermore, the gas gun has a spiral sleeve adapted to the external gun mount, and the spiral sleeve has a spiral groove adapted to the locking post on the external gun mount.

[0019] Compared with the prior art, the advantages of this utility model are as follows: During depressurization, the return gas gun and the gas cylinder exhaust port can be quickly connected without disassembling the depressurization pipe, ensuring that the discharged natural gas and the vehicle maintain a certain distance, ensuring the safety of the operators and the vehicle, while being convenient and quick, greatly improving the efficiency of vehicle maintenance; the gas pressure in the gas phase of the gas cylinder can be discharged conveniently, quickly, safely and reliably; the recovered natural gas can also be used as fuel for other purposes or can be refilled into the gas cylinder of the maintained vehicle, saving fuel costs. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of an embodiment.

[0021] Figure 2 This is an enlarged view of the air return gun in the embodiment. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0023] like Figure 1 As shown, the natural gas vehicle liquefied natural gas cylinder depressurization device in this embodiment includes a vehicle body 1, a support frame 2, a gas storage tank 3, a depressurization pipe 4, and a return gas gun 5.

[0024] The vehicle body 1 has a support plate 11 and wheels 12 located below the support plate 11; the vehicle body 1 is equipped with a handle 13 for easy movement. The vehicle body 1 is also equipped with a leak alarm 6, which can sound an alarm when a natural gas leak is detected in the surrounding area; the vehicle body 1 is also equipped with a work warning light 9, so as to promptly remind nearby personnel that depressurization work is underway and to take precautions.

[0025] Support frame 2 is mounted on vehicle body 1. In this embodiment, support frame 2 is equipped with a three-way connector 81. One end of the three-way connector 81 is connected to the pressure relief pipe 4, one end is connected to the gas storage tank 3 and is equipped with a recovery valve 82, and the other end is connected to the vent pipe 7. The vent pipe 7 is equipped with a vent valve 71. The vent pipe 7 can be configured as an upper telescopic pipe 72 and a lower telescopic pipe 73, and the vent valve 71 is located on the lower telescopic pipe.

[0026] The gas storage tank 3 is mounted on the vehicle body 1; the pressure relief pipe 4 is mounted on the support frame 2 and one end is connected to the gas storage tank 3 through the support frame 2. The gas storage tank 3 is equipped with a pressure gauge 31 and a safety valve 32.

[0027] like Figure 2 As shown, the return air gun 5 is connected to the other end of the pressure relief pipe 4. The return air gun 5 has a spiral retaining sleeve 51 adapted to the external gun seat, and the spiral retaining sleeve 51 has a spiral groove 52 adapted to the retaining post on the external gun seat. The return air gun in this embodiment can refer to the common return air guns on the market in the prior art, or it can adopt the structure disclosed in ZL202221243592.6 (CN217736916U) and ZL202222004138.1 (CN217684391U), which will not be elaborated in this application.

[0028] Operating procedure: Push the depressurization device next to the vehicle, connect the return air gun to the exhaust port of the vehicle's gas cylinder, fit the spiral clamp to the gun base, fit the spiral groove to the clamp post, rotate, and use the ejector pin inside the gun to open the exhaust port and the return air gun valve, close the vent valve, open the recovery valve, so that the gas phase part of the vehicle's gas cylinder is connected to the gas storage tank, and depressurize the natural gas in the gas cylinder into the gas storage tank.

[0029] When the pressure in the gas cylinder is equal to the pressure in the storage tank, the depressurization work stops. At this time, the recovery valve is closed and the vent valve is opened to completely empty the residual pressure in the gas cylinder to be repaired.

[0030] After the vehicle's gas cylinder maintenance is completed, the vent valve can be closed and the recovery valve opened to return the natural gas from the storage tank to the vehicle's gas cylinder, so that the vehicle can drive to the gas station to refuel and improve the economy of the operation.

[0031] The vehicle body, support frame, and vent pipe are designed to ensure that the height of the emitted gas reaches a safe level. The sealed connection of the gas tank, vent pipe, pressure relief pipe, return air gun, tee connector, and various valves ensures that the low-altitude gas flow is in a closed environment, thereby improving the safety of the operation.

Claims

1. A depressurization device for liquefied natural gas cylinders in natural gas vehicles, characterized in that... include The vehicle body (1) has a support plate (11) and wheels (12) located below the support plate (11); Support frame (2) is mounted on the aforementioned vehicle body (1); An air storage tank (3) is installed on the aforementioned vehicle body (1); A pressure relief pipe (4) is mounted on the aforementioned support frame (2) and one end is connected to the aforementioned gas storage tank (3); and The return air gun (5) is connected to the other end of the aforementioned pressure relief pipe (4); The support frame (2) is provided with a three-way connector (81), one end of which is connected to the pressure relief pipe (4), one end of which is connected to the gas storage tank (3) and is provided with a recovery valve (82), and the other end is connected to the vent pipe (7), which is provided with a vent valve (71).

2. The natural gas vehicle liquefied natural gas cylinder depressurization device according to claim 1, characterized in that... The vehicle body (1) is equipped with a natural gas leak alarm (6).

3. The natural gas vehicle liquefied natural gas cylinder depressurization device according to claim 1, characterized in that... The gas gun (5) has a spiral sleeve (51) adapted to the external gun seat, and the spiral sleeve (51) has a spiral groove (52) adapted to the locking post on the external gun seat.

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