Automotive LNG (Liquefied Natural Gas) low-temperature pressure boosting and regulating valve

Abstract

The utility model discloses an automotive LNG (Liquefied Natural Gas) low-temperature pressurizing and pressure regulating valve, and mainly relates to the field of automotive LNG low-temperature heat-insulating gas cylinders. Comprising a valve body, an upper cover is arranged at the top of the valve body, a spring upper gasket is arranged in the upper cover, an adjusting screw rod is vertically arranged at the top of the spring upper gasket, a threaded hole matched with the adjusting screw rod is formed in the upper cover, a spring is arranged at the bottom of the upper cover, and a filling block is arranged on the inner side of the spring. The filling block is positioned between the spring upper liner and the spring lower liner; the upper cover is sleeved with a detachable waterproof sleeve, the threaded hole penetrates through the top wall of the upper cover, a sealing gasket is arranged at the top of the threaded hole and locked on the upper cover through a locking piece, micropores are formed in the waterproof sleeve and the sealing gasket, and the top end of a balance hole in the upper cover is communicated with the threaded hole and located on the lower side of the sealing gasket; the pressure is stable, and the failure caused by freezing of condensed water at the spring can be effectively prevented.

Description

Technical Field

[0001] This utility model relates to the field of LNG cryogenic insulated gas cylinders for vehicles, specifically a cryogenic booster and pressure regulating valve for LNG in vehicles. Background Technology

[0002] Currently, liquefied natural gas (LNG) is widely used as a safe, efficient, and clean energy source. At the same time, the application of LNG cryogenic insulated cylinders for vehicles is becoming increasingly common. Among them, the LNG cryogenic booster and pressure regulating valve for vehicles, as an essential component for the effective control of LNG systems, is widely used in LNG cryogenic insulated cylinder systems for vehicles.

[0003] The function of the LNG cryogenic booster and pressure regulator valve in vehicles: When LNG is consumed in vehicle cryogenic insulated gas cylinders, the pressure inside the cylinder will decrease. In order to maintain the pressure inside the cylinder, when the pressure inside the cylinder drops to a certain value, the booster and pressure regulator valve will open. LNG will then be vaporized through the booster vaporizer and enter the gas phase space of the cylinder, causing the pressure to rise. When a certain pressure is reached, the booster and pressure regulator valve will close, maintaining the gas cylinder at a stable pressure.

[0004] The top cover of the cryogenic booster valve is equipped with a balance hole, which allows one side of the diaphragm to be open to the outside atmosphere. This enables the diaphragm to respond quickly when it is activated. In addition, if there is a leak at the diaphragm, the gas can be discharged through the balance hole, which serves a safety function.

[0005] However, the installation location of existing LNG cryogenic booster valves for vehicles is often exposed to the air. During use, LNG vaporizes and enters the gas phase space inside the cylinder through the booster valve. Therefore, during the boosting process, the temperature of the booster valve will drop to sub-zero. Air coming into contact with the booster valve will condense into water. Due to the low temperature, the air in the upper cavity of the booster valve contracts, creating a negative pressure. The condensate is drawn into the upper cover through the balance hole of the upper cover, continuously accumulating and filling the inner cavity of the upper cover in an ice state. At this time, the spring will fail and cannot be compressed. The valve core of the cryogenic booster valve will remain in the open state. The booster valve cannot automatically close the booster as the pressure increases. The failure of the cryogenic booster valve causes the pressure inside the cylinder to rise continuously, resulting in a situation where it cannot be used normally and poses a safety hazard. Utility Model Content

[0006] The purpose of this invention is to solve the problems existing in the prior art and provide a vehicle-mounted LNG cryogenic booster and pressure regulating valve that provides stable pressure and effectively prevents failure caused by condensation freezing at the spring.

[0007] To achieve the above objectives, this utility model employs the following technical solution:

[0008] A vehicle-mounted LNG cryogenic booster and pressure regulating valve includes a valve body, a top cover on the valve body, an upper spring gasket inside the top cover, an adjusting screw vertically positioned at the top of the upper spring gasket, a threaded hole on the top cover corresponding to the adjusting screw, a spring at the bottom of the top cover, a filler block inside the spring, the filler block being located between the upper spring gasket and the lower spring gasket; a removable waterproof sleeve is fitted onto the top cover, the threaded hole penetrating the top wall of the top cover, and a sealing gasket positioned at the top of the threaded hole, the sealing gasket being locked onto the top cover by a locking member, and micropores being provided on both the waterproof sleeve and the sealing gasket; the top of a balance hole on the top cover communicating with the threaded hole and located below the sealing gasket.

[0009] Preferably, the waterproof sleeve is fixed to the upper cover by a hose clamp.

[0010] Preferably, the top of the cover has an upwardly protruding mounting portion in the middle, the axis of the threaded hole coincides with the axis of the mounting portion, and the locking member is a threaded locking sleeve adapted to the mounting portion, which is threadedly connected to the mounting portion.

[0011] Preferably, the threaded hole is a countersunk hole, and the top of the adjusting screw is provided with an internal hexagonal hole.

[0012] Preferably, a diaphragm is provided between the valve body and the upper cover, a pressure block is provided on the lower side of the diaphragm, a valve stem assembly is provided at the bottom of the pressure block, a pressure cap spring is provided at the bottom of the valve stem assembly, and a pressure cap is provided at the bottom of the pressure cap spring, with the pressure cap threadedly connected to the valve body.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] 1. This utility model adds a filling block inside the upper cover, reducing the space inside the upper cover and thus reducing the impact of gas contraction due to cooling on the output pressure.

[0015] 2. This utility model adds a sealing gasket to the top of the cover and a waterproof sleeve to the outside of the cover, and both are provided with micropores to prevent external air from directly contacting the inside of the cover through the balance hole, and to avoid the low temperature pressure valve from failing due to water freezing inside the cover and causing the spring to freeze. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model.

[0017] The following are the components listed in the attached diagram: 1. Waterproof sleeve; 2. Sealing gasket; 3. Locking element; 4. Adjusting screw; 5. Top cover; 6. Upper spring gasket; 7. Hose clamp; 8. Spring; 9. Filler block; 10. Lower spring gasket; 11. Snap ring; 12. Diaphragm; 13. Sealing ring; 14. Sealing washer; 15. Pressure block; 16. Valve body; 17. Valve lever assembly; 18. Pressure cap spring; 19. Pressure cap washer; 20. Pressure cap; 21. QR code label. Detailed Implementation

[0018] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the present invention, and these equivalent forms also fall within the scope defined in this application.

[0019] This invention effectively prevents valve failure caused by condensation and freezing at the spring by adding a waterproof sleeve, sealing gasket, and filler block.

[0020] Example: As attached Figure 1 This utility model describes a cryogenic LNG booster and pressure regulating valve for vehicles, including a valve body 16. The top of the valve body 16 is provided with an upper cover 5, which is threadedly connected to the valve body 16. The structures of both the valve body 16 and the upper cover 5 can adopt existing technologies. A diaphragm 12 is provided between the valve body 16 and the upper cover 5. A pressure block 15 is provided on the lower side of the diaphragm 12. A valve stem assembly 17 is provided at the bottom of the pressure block 15. The pressure block 15 and the valve stem assembly 17 are connected by a retaining spring 11. A sealing ring 13 is provided on the upper side of the diaphragm 12, and a sealing washer 14 is provided on the lower side of the diaphragm 12. A pressure cap spring 18 and a receiving hole adapted to the pressure cap spring 18 are provided at the bottom of the valve stem assembly 17. A pressure cap 20 is provided at the bottom of the pressure cap spring 18. The pressure cap 20 is threadedly connected to the valve body 16. A pressure cap washer 19 is provided between the pressure cap 20 and the valve body 16. The bottom end of the valve stem assembly 17 is inserted into the pressure cap 20. A QR code label 21 is provided at the bottom of the pressure cap 20.

[0021] The upper cover 5 is provided with a spring upper pad 6. The top of the spring upper pad 6 is provided with an adjusting screw 4. The upper cover 5 is provided with a threaded hole that is compatible with the adjusting screw 4. The bottom of the upper cover 5 is provided with a spring 8, which is a pressure adjusting spring. The inner side of the spring 8 is provided with a filling block 9, which is located between the spring upper pad 6 and the spring lower pad 10.

[0022] A removable waterproof sleeve 1 is fitted onto the upper cover 5. The waterproof sleeve 1 is a cap-shaped body with an open bottom and can be made of rubber. The threaded hole penetrates the top wall of the upper cover 5, and a sealing gasket 2 is provided at the top of the threaded hole. The sealing gasket 2 can be made of rubber and is locked onto the upper cover 5 by a locking member 3. Both the waterproof sleeve 1 and the sealing gasket 2 have micropores. The top of the balance hole on the upper cover 5 communicates with the threaded hole and is located below the sealing gasket 2.

[0023] Preferably, in order to facilitate the fixing of the waterproof sleeve, the waterproof sleeve 1 is fixed to the upper cover 5 by a hose clamp 7.

[0024] Preferably, to facilitate locking of the sealing gasket, the top of the upper cover 5 has an upwardly protruding mounting portion in the middle. The axis of the threaded hole coincides with the axis of the mounting portion. The locking member 3 is a threaded locking sleeve adapted to the mounting portion. The threaded locking sleeve is threadedly connected to the mounting portion. The top of the threaded locking sleeve has a pressure ring extending inward. The threaded hole penetrates the mounting portion. The mounting portion has external threads. The sealing gasket 2 is placed on the top of the mounting portion and locked by the locking member 3.

[0025] Preferably, in order to facilitate the rotation of the adjusting screw, the threaded hole is a countersunk hole, and the top of the adjusting screw 4 is provided with an internal hexagonal hole, so that the adjusting screw 4 can be rotated by an internal hexagonal wrench.

Claims

1. A vehicle-mounted LNG cryogenic booster and pressure regulating valve, comprising a valve body (16), wherein the valve body (16) has a top cover (5) and a spring upper gasket (6) is provided inside the top cover (5), an adjusting screw (4) is vertically provided on the top of the spring upper gasket (6), the top cover (5) has a threaded hole adapted to the adjusting screw (4), and a spring (8) is provided at the bottom of the top cover (5), characterized in that: The inner side of the spring (8) is provided with a filling block (9), which is located between the upper spring pad (6) and the lower spring pad (10); the upper cover (5) is fitted with a removable waterproof sleeve (1), the threaded hole penetrates the top wall of the upper cover (5), and a sealing gasket (2) is provided at the top of the threaded hole. The sealing gasket (2) is locked on the upper cover (5) by a locking member (3), and micro-holes are provided on both the waterproof sleeve (1) and the sealing gasket (2). The top of the balance hole on the upper cover (5) is connected to the threaded hole and located on the lower side of the sealing gasket (2).

2. The vehicle-mounted LNG cryogenic booster and pressure regulating valve according to claim 1, characterized in that: The waterproof sleeve (1) is fixed to the upper cover (5) by a hose clamp (7).

3. The vehicle-mounted LNG cryogenic booster and pressure regulating valve according to claim 1, characterized in that: The top of the cover (5) is provided with an upwardly protruding mounting part in the middle. The axis of the threaded hole coincides with the axis of the mounting part. The locking member (3) is a threaded locking sleeve adapted to the mounting part. The threaded locking sleeve is threadedly connected to the mounting part.

4. The vehicle-mounted LNG cryogenic booster and pressure regulating valve according to claim 1, characterized in that: The threaded hole is a countersunk hole, and the top of the adjusting screw (4) is provided with an internal hexagonal hole.

5. The LNG cryogenic booster and pressure regulating valve for vehicles according to claim 1, characterized in that: A diaphragm (12) is provided between the valve body (16) and the upper cover (5). A pressure block (15) is provided on the lower side of the diaphragm (12). A valve rod assembly (17) is provided at the bottom of the pressure block (15). A pressure cap spring (18) is provided at the bottom of the valve rod assembly (17). A pressure cap (20) is provided at the bottom of the pressure cap spring (18). The pressure cap (20) is threadedly connected to the valve body (16).

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