A valve for a compressed natural gas cylinder for vehicles

Abstract

The application discloses a compressed natural gas bottle valve for vehicle, which comprises a valve body, a safety device and an opening and closing device. The valve body comprises an air inlet end and an air outlet, the air inlet end is suitable for being connected to a gas bottle, the air inlet end is provided with a first air inlet channel and a second air inlet channel, the second air inlet channel is communicated with the air outlet; the safety device is sealedly connected to the outlet end of the first air inlet channel, when the pressure in the gas bottle is higher than a first set value or the ambient temperature is higher than a second set value, the safety device opens the outlet end of the first air inlet channel to release pressure; the opening and closing device comprises a flow limiting valve, a sealing mechanism and an adjusting mechanism, the flow limiting valve is arranged at the second air inlet channel, the flow limiting valve limits the gas flow within a third set value, and the sealing mechanism comprises a valve rod and a sealing element arranged on the valve rod. The application can improve the endurance mileage of the natural gas vehicle, and through the cooperation of the adjusting mechanism and the flow limiting valve, a lower gas flow can be limited without replacing the original flow limiting valve, and the gas flow can be linearly adjusted, thereby increasing the practicability.

Description

Technical Field

[0001] This application relates to the technical field of gas cylinder valves, and particularly to a vehicle-mounted compressed natural gas cylinder valve. Background Technology

[0002] Currently, with increasingly stringent requirements for vehicle emissions and the growing scarcity of traditional vehicle fuels, coupled with the undeniable environmental pollution caused by these fuels, the development and utilization of new energy sources has become an increasingly urgent need. Natural gas, as a new energy source, is globally recognized as an efficient, clean, and high-quality energy source, and natural gas vehicles using natural gas as fuel are attracting increasing attention. It offers advantages such as low fuel costs, lower emissions, simple vehicle modification, and high safety and reliability.

[0003] Natural gas vehicles are cars equipped with natural gas cylinders that use compressed natural gas stored in the cylinders to power the vehicle. A natural gas cylinder valve is a device installed between the natural gas cylinder and the gas supply line to control the gas flow. To improve the driving range of natural gas vehicles, the China Automotive Technology and Research Center (CATARC) plans to increase the working pressure of natural gas cylinders from 20MPa to 35MPa. To fill the technological gap in the market for this type of valve, this invention provides a 35MPa vehicle-mounted compressed natural gas cylinder valve. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the present invention aims to provide a vehicle-mounted compressed natural gas cylinder valve, which can improve the driving range of natural gas vehicles, and can limit a lower gas flow rate without replacing the original flow limiting valve through the adjustment mechanism and the cooperation of the flow limiting valve, and can be linearly adjusted, thus increasing practicality.

[0005] To achieve the above objectives, this application provides a vehicle-mounted compressed natural gas cylinder valve, comprising: a valve body including an inlet end and an outlet, the inlet end being adapted to be connected to a gas cylinder, the inlet end having a first inlet channel and a second inlet channel, the second inlet channel communicating with the outlet; a safety device, sealed and connected to the outlet end of the first inlet channel, wherein when the pressure inside the gas cylinder is higher than a first set value or the ambient temperature is higher than a second set value, the safety device opens the outlet end of the first inlet channel to release pressure; and an opening and closing device including a flow-limiting valve, a sealing mechanism, and an adjusting mechanism, wherein the flow-limiting valve is located at the second inlet channel and limits the gas flow rate within a third set value, the sealing mechanism including a valve stem and a sealing element disposed on the valve stem, the sealing element sealingly cooperating with the valve body to form a valve, the valve controlling the opening and closing of the second inlet channel and the outlet, and the adjusting mechanism cooperating with the flow-limiting valve to reduce the third set value.

[0006] Compared with existing technologies, the advantages of this application are as follows: When the working pressure of a natural gas cylinder is increased from 20MPa to 35MPa, the requirements for the flow-limiting valve are higher due to the increased working pressure. Conventional flow-limiting valves cannot meet the usage requirements, and the development cost of flow-limiting valves is very high. Furthermore, flow-limiting valves can only limit a single flow and cannot be linearly adjusted. This application, through the cooperation of an adjustment mechanism and a flow-limiting valve, adjusts the gas flow rate to better meet usage requirements. It can reduce the gas flow rate without replacing the flow-limiting valve, saving costs, and linearly adjusts the gas flow limit to improve practicality.

[0007] As an improvement, the regulating mechanism further includes a first valve, a second valve, and a first spring. The seal is fixed to the first valve, and the second valve is fixed to the valve stem. The first valve and the second valve are connected by the first spring, which provides pressure to press the seal against the inner wall of the valve body. The opening and closing device further includes a connecting mechanism. The first valve can be fixedly connected to the second valve through the connecting mechanism. When the first valve and the second valve are fixedly connected, the valve stem drives the first valve and the second valve to move synchronously to control the size of the valve. When the first valve and the second valve are separated, the valve stem drives the second valve to move to adjust the elastic force of the first spring and restrict the gas flow within a fourth set value through the cooperation of the first spring and the seal.

[0008] As an improvement, since valves typically require tightening the valve stem to fully close, the requirements for valve closure are high. In this application, the first and second valves are connected by a first spring. When the valve is closed, it is not necessary to tighten the valve stem to achieve a complete valve closure, thus preventing the valve from not closing completely if the valve stem is not tightened. This reduces the difficulty of operation and improves the valve opening and closing effect. The first and second valves can be connected or separated by a connecting mechanism. When the first and second valves are fixedly connected, the valve stem can move the first and second valves to precisely adjust the valve size. When the first and second valves are separated, the valve stem moves the second valve to adjust the elasticity of the first spring. Thus, under the condition of flow restriction by the flow limiting valve, the flow is further restricted by the cooperation of the first spring and the sealing element, thereby improving the flow restriction effect without replacing the flow limiting valve. The adjustment is linear and ensures that the gas in the cylinder flows normally from the second inlet channel to the outlet.

[0009] As an improvement, the valve stem is internally threaded with an operating rod. The operating rod has a protrusion at one end near the first valve and a handle extending out of the valve body at the other end. The connecting mechanism is a locking block structure. The first valve has a first slot. Rotating the handle allows the protrusion to be inserted into the first slot, and the locking block structure fixes the first valve and the second valve together. With the above improvement, the operating rod can be rotated by the handle for easy adjustment. The locking block structure is simple and stable, and can stably drive the connection or separation of the first valve and the second valve by controlling the operating rod, which is convenient for operation.

[0010] As an improvement, the first valve also has a second slot and a third slot that communicate with each other. The connecting mechanism includes a plug and a limiting block. The plug is fixed to the second valve and has a limiting groove. The limiting block is movably disposed in the second slot. The protrusion has a conical surface, and the end of the plug near the protrusion has an inclined surface that mates with the conical surface. The valve stem can drive the plug on the first valve to insert into the third slot, the protrusion to insert into the first slot, and the inclined surface to abut against the conical surface. The limiting groove and the second slot... When the protrusion forces the limiting block into the limiting groove, the limiting block engages with the insert block, and the first valve and the second valve are fixedly connected. With the above improvement, the insert block is fixed on the second valve. When the insert block is inserted into the third slot, the first valve and the second valve are tightly fitted together, the first spring is compressed, and the limiting groove on the limiting block is connected to the second slot. At this time, the inclined surface abuts against the conical surface. By rotating the operating rod, the protrusion of the operating rod can force the limiting block into the slot, thereby making the insert block engage with the limiting block. Therefore, when the valve stem can synchronously drive the first valve and the second valve to move synchronously, the engaging structure is simple and stable.

[0011] As an improvement, the connecting mechanism further includes a second spring. The limiting block is provided with a limiting part. One end of the second spring is connected to the limiting part, and the other end is connected to the inner wall of the first slot. The limiting part cooperates with the inner wall of the first slot to limit the extreme movement distance of the insertion block. The second spring forces the limiting block to reset. Through the above improvement, the limiting part can limit the extreme movement distance of the operating lever, so that the operator has operation feedback, and the limiting block can be automatically reset by the second spring. Thus, the first valve and the second valve are automatically separated after the operating lever is retracted, improving automation and reducing operation steps.

[0012] As an improvement, the sealing mechanism further includes a pressure cap and a third spring. The valve stem passes through the pressure cap, and a portion of the pressure cap is threadedly connected to the valve body. A stroke cavity is formed in the valve body, and the pressure cap is adapted to move within the stroke cavity. One end of the third spring is connected to the inner wall of the stroke cavity, and the other end is connected to the pressure cap. When the pressure cap rotates to disengage from the valve body, the third spring forces the pressure cap to move the valve stem away from the first valve, thus fully opening the valve. Through the above improvement, a portion of the pressure cap is threadedly connected to the valve body. When the pressure cap rotates to disengage from the valve body, the third spring can cause the valve stem to return to its maximum limit distance, thereby fully opening the valve. Based on positive feedback from the operator, the valve's opening and closing status can be controlled, and the fully open valve status can be ensured.

[0013] As an improvement, the sealing mechanism further includes a first sealing ring, a second sealing ring, and a retaining ring. The first sealing ring and the retaining ring are disposed on the outer periphery of the valve stem and are sealed to fit with the pressure cap hole. The valve stem is also equipped with a handwheel extending out of the valve body. The second sealing ring is disposed between the valve stem and the handwheel. Through the above improvements, the first sealing ring and the retaining ring can form a radial seal between the outer periphery of the valve stem and the pressure cap hole surface, and the second sealing ring can form a seal between the handwheel and the valve stem.

[0014] As an improvement, the safety device includes a first screw plug and a rupture disc. The first screw plug is located at the outlet end of the first air inlet channel, and a first vent is provided on the first screw plug. The first screw plug presses against the rupture disc, and the rupture disc is sealed to the valve body. The first set value is 52.5~57.75 MPa. With the above improvement, when the pressure inside the gas cylinder is lower than the set operating pressure of the rupture disc, the rupture disc does not operate, and the rupture disc blocks the first vent channel between the first air inlet channel and the first vent of the first screw plug, preventing gas from leaking out of the vent of the first screw plug. However, when the gas pressure inside the gas cylinder is higher than or equal to the operating pressure of the rupture disc, the rupture disc bursts, and the gas inside the gas cylinder flows from the air inlet channel through the inner hole of the pressure ring to the vent of the first screw plug, ensuring the safety of the gas cylinder.

[0015] As an improvement, the safety device includes a second screw plug, a temperature-sensing glass bulb, a piston rod, and a fourth spring. The second screw plug is located at the outlet end of the first air inlet channel, and a second vent is provided on the second screw plug. The temperature-sensing glass bulb is fixed inside the second screw plug by the fourth spring on the piston rod. The second set value is 105-115℃. With the above improvement, when the ambient temperature is lower than the operating temperature of the temperature-sensing glass bulb, the temperature-sensing glass bulb inside the second screw plug presses against the piston rod, and the O-ring on the piston rod blocks the passage between the vent and the valve body and the air inlet of the valve body, preventing gas in the gas cylinder from leaking out from the second vent. However, when the ambient temperature is greater than or equal to the operating temperature of the temperature-sensing glass bulb, the temperature-sensing glass bulb breaks, and the piston rod moves under the pressure of the gas in the gas cylinder and the force of the fourth spring, and the second vent discharges the gas in the gas cylinder, ensuring the safety of the gas cylinder.

[0016] As an improvement, the first air intake channel has two outlet ends. The safety device includes a first screw plug and a second screw plug, which are respectively sealed and connected to the two outlet ends of the first air intake channel. The first screw plug contains a rupture disc to limit the pressure value inside the gas cylinder, and the second screw plug contains a temperature-sensing glass bulb to set the maximum ambient temperature value. The valve body is equipped with a distance measuring scale to measure the movement distance of the valve stem. Through the above improvements, the first and second screw plugs are connected in parallel, thereby ensuring safety from both ambient temperature and gas cylinder pressure. The distance measuring scale can accurately measure the movement distance of the valve stem, thereby controlling the opening and closing size of the valve. Attached Figure Description

[0017] Figure 1 This is a cross-sectional schematic diagram of the overall structure of this application.

[0018] Figure 2 for Figure 1 A cross-sectional schematic diagram of AA.

[0019] Figure 3 for Figure 2 A magnified view of part B in the diagram.

[0020] Figure 4 for Figure 3 A magnified view of part C in the diagram.

[0021] Figure 5 for Figure 3 A schematic diagram showing the state after the pressure cap is disconnected from the valve body from the threaded connection.

[0022] In the diagram: 1. Valve body; 11. Inlet end; 111. First intake channel; 112. Second intake channel; 12. Outlet; 2. Safety device; 21. First screw plug; 211. First vent; 22. Rupture disc; 23. Second screw plug; 231. Second vent; 24. Temperature-sensing glass bulb; 25. Piston rod; 26. Fourth spring; 31. Flow limiting valve; 32. Sealing mechanism; 321. Valve stem; 3211. Handwheel; 322. Seal; 323. Operating lever; 3231. 3232, Conical surface; 324, Pressure cap; 325, Third spring; 326, First sealing ring; 327, Second sealing ring; 328, Retaining ring; 33, Adjusting mechanism; 331, First valve; 3311, First slot; 3313, Second slot; 3314, Third slot; 332, Second valve; 333, First spring; 41, Insert block; 411, Limiting groove; 42, Limiting block; 421, Inclined surface; 422, Limiting part; 43, Second spring; 5, Measuring ruler. Detailed Implementation

[0023] The present application will be further described below with reference to specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0024] In the description of this application, it should be noted that the directional terms such as "center", "upper", "lower", "front", "back", "vertical", "horizontal", "inner", and "outer" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this application.

[0025] It should be noted that the terms "first," "second," etc., in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0026] The terms “comprising” and “having”, and any variations thereof, in the specification and claims of this application are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0027] This application provides a valve for a vehicle-mounted compressed natural gas cylinder, such as... Figure 1-5As shown, it includes valve body 1, safety device 2, and opening / closing device. The valve body 1 includes an inlet end 11 and an outlet end 12. The inlet end 11 is adapted to be connected to a gas cylinder. The inlet end 11 has a first inlet channel 111 and a second inlet channel 112. The second inlet channel 112 is connected to the outlet end 12. The safety device 2 is sealed to the outlet end of the first inlet channel 111. When the pressure inside the gas cylinder is higher than the first set value or the ambient temperature is higher than the second set value, the safety device 2 opens the outlet end of the first inlet channel 111 to release pressure. The opening and closing device includes a flow limiting valve 31, a sealing mechanism 32 and an adjusting mechanism 33. The flow limiting valve 31 is located at the second inlet channel 112 and limits the gas flow rate within a third set value. The sealing mechanism 32 includes a valve stem 321 and a sealing element 322 located on the valve stem 321. The sealing element 322 and the valve body 1 are sealed together to form a valve. The valve controls the opening and closing of the second inlet channel 112 and the outlet end 12. The adjusting mechanism 33 cooperates with the flow limiting valve 31 to reduce the third set value.

[0028] Specifically, such as Figure 2-3 As shown, the regulating mechanism 33 also includes a first valve 331, a second valve 332, and a first spring 333. The sealing element 322 is fixed to the first valve 331, and the second valve 332 is fixed to the valve stem 321. The first valve 331 and the second valve 332 are connected by the first spring 333. The first spring 333 provides pressure to make the sealing element 322 press against the inner wall of the valve body 1. The opening and closing device also includes a connecting mechanism. The first valve 331 can be fixedly connected to the second valve 332 through the connecting mechanism. When the first valve 331 and the second valve 332 are fixedly connected, the valve stem 321 drives the first valve 331 and the second valve 332 to move synchronously to control the size of the valve. When the first valve 331 and the second valve 332 are separated, the valve stem 321 drives the second valve 332 to move to adjust the elastic force of the first spring 333, and the gas flow is limited within the fourth set value by the cooperation of the first spring 333 and the sealing element 322.

[0029] It should be noted that, under normal circumstances, the fourth setting value is less than the third setting value.

[0030] The first valve 331 and the second valve 332 are connected by a first spring 333. When the valve is closed, it can achieve complete valve closure without tightening the valve stem 321, thus preventing the valve from not fully closing if the valve stem 321 is not tightened. This reduces operational difficulty and improves valve opening and closing efficiency. The first valve 331 and the second valve 332 can be connected or separated by a connecting mechanism. When the first valve 331 and the second valve 332 are fixedly connected, the valve stem 321 drives the first valve 331 and the second valve 332... The movement of the two valves 332 allows for precise adjustment of the valve size. When the first valve 331 and the second valve 332 are separated, the valve stem 321 drives the second valve 332 to move, thereby adjusting the elastic force of the first spring 333. Thus, under the condition that the flow-limiting valve 31 limits the flow, the first spring 333 and the seal 322 work together to further limit the flow, thereby improving the flow-limiting effect without replacing the flow-limiting valve 31. This is linearly adjustable, ensuring that the gas in the gas cylinder flows normally from the second air inlet channel 112 to the air outlet 12.

[0031] Specifically, such as Figure 3 As shown, the valve stem 321 is internally threaded with an operating lever 323. The operating lever 323 has a protrusion 3231 at one end near the first valve 331 and a handle extending out of the valve body 1 at the other end. The connecting mechanism is a locking block structure. The first valve 331 has a first slot 3311. Rotating the handle allows the protrusion 3231 to be inserted into the first slot 3311, and the locking block structure fixes the first valve 331 to the second valve 332.

[0032] Specifically, such as Figure 4-5 As shown, the first valve 331 is further provided with a second slot 3313 and a third slot 3314 that are interconnected. The connecting mechanism includes a plug 41 and a limiting block 42. The plug 41 is fixed on the second valve 332 and has a limiting groove 411. The limiting block 42 is movably disposed in the second slot 3313. The protrusion 3231 is provided with a conical surface 3232, and the end of the plug 41 near the protrusion 3231 is provided with a part that cooperates with the conical surface 3232. The inclined surface 421 allows the valve stem 321 to drive the insert block 41 on the first valve 331 to insert into the third slot 3314, and the protrusion 3231 to insert into the first slot 3311, so that the inclined surface 421 and the conical surface 3232 abut against each other. The limiting groove 411 is connected to the second slot 3313. When the protrusion 3231 forces the limiting block 42 into the limiting groove 411, the limiting block 42 and the insert block 41 are engaged, and the first valve 331 and the second valve 332 are fixedly connected.

[0033] Specifically, such as Figure 4As shown, the connecting mechanism also includes a second spring 43. The limiting block 42 is provided with a limiting part 422. One end of the second spring 43 is connected to the limiting part 422, and the other end is connected to the inner wall of the first slot 3311. The limiting part 422 cooperates with the inner wall of the first slot 3311 to limit the extreme movement distance of the insert 41. The second spring 43 forces the limiting block 42 to reset.

[0034] Specifically, such as Figure 5 As shown, the sealing mechanism 32 also includes a pressure cap 324 and a third spring 325. The valve stem 321 passes through the pressure cap 324, and part of the pressure cap 324 is threadedly connected to the valve body 1. A stroke cavity is provided inside the valve body 1, and the pressure cap 324 is adapted to move within the stroke cavity. One end of the third spring 325 is connected to the inner wall of the stroke cavity, and the other end is connected to the pressure cap 324. When the pressure cap 324 rotates to the point where it is no longer threadedly connected to the valve body 1, the third spring 325 forces the pressure cap 324 to move the valve stem 321 away from the first valve 331, thus fully opening the valve. Part of the pressure cap 324 is threadedly connected to the valve body 1. When the pressure cap 324 rotates to the point where it is no longer threadedly connected to the valve body 1, the third spring 325 can cause the valve stem 321 to return to its maximum limit distance, thereby fully opening the valve. Based on positive feedback from the operator, the valve's opening and closing state can be controlled, and the fully open state of the valve can be ensured.

[0035] Specifically, such as Figure 5 As shown, the sealing mechanism 32 also includes a first sealing ring 326, a second sealing ring 327 and a retaining ring 328. The first sealing ring 326 and the retaining ring 328 are disposed on the outer periphery of the valve stem 321 and are sealed in fit with the pressure cap 324 hole. The valve stem 321 is also equipped with a handwheel 3211 that extends out of the valve body 1. The second sealing ring 327 is disposed between the valve stem 321 and the handwheel 3211.

[0036] Specifically, the safety device 2 includes a first screw plug 21 and a rupture disc 22. The first screw plug 21 is located at the outlet end of the first air intake channel 111. A first vent 211 is provided on the first screw plug 21. The first screw plug 21 presses against the rupture disc 22, and the rupture disc 22 is sealed to the valve body 1.

[0037] Preferably, the first setting value is 52.5~57.75 MPa.

[0038] Specifically, the safety device 2 includes a second screw plug 23, a temperature-sensing glass ball 24, a piston rod 25, and a fourth spring 26. The second screw plug 23 is located at the outlet end of the first air intake channel 111, and a second vent 231 is provided on the second screw plug 23. The temperature-sensing glass ball 24 is fixed inside the second screw plug 23 by the fourth spring 26 on the piston rod 25.

[0039] Preferably, the second setting value is 105-115℃.

[0040] Preferably, the first air intake channel 111 has two outlet ends, and the safety device 2 includes a first screw plug 21 and a second screw plug 23. The first screw plug 21 and the second screw plug 23 are respectively sealed and connected to the outlet ends of the two first air intake channels 111. The first screw plug 21 is provided with a rupture disc 22 to limit the pressure value inside the gas cylinder, and the second screw plug 23 is provided with a temperature-sensing glass ball 24 to set the maximum ambient temperature value.

[0041] Preferably, the valve body 1 is provided with a distance measuring ruler 5 to measure the movement distance of the valve stem 321.

[0042] Preferably, the valve pressure-bearing component blank is made of HPb59-1 leaded brass through multi-directional extrusion molding, which gives it better density, better shell strength, and tensile strength.

[0043] The working principle of this application is as follows: When the pressure inside the gas cylinder is lower than the set operating pressure of the rupture disc 22, the rupture disc 22 does not operate. The rupture disc 22 blocks the passage between the first air inlet channel 111 and the first vent 211 of the first screw plug 21, preventing the gas inside the gas cylinder from leaking out of the vent of the first screw plug 21. However, when the gas pressure inside the gas cylinder is higher than or equal to the operating pressure of the rupture disc 22, the rupture disc 22 bursts, and the gas inside the gas cylinder flows from the air inlet channel through the inner hole of the pressure ring to the vent of the first screw plug 21, thus ensuring the safety of the gas cylinder.

[0044] When the ambient temperature is lower than the operating temperature of the temperature-sensing glass bulb 24, the temperature-sensing glass bulb 24 inside the second screw plug 23 presses against the piston rod 25. The O-ring on the piston rod 25 blocks the passage between the second screw plug 23 and the valve body 1, preventing gas from leaking out of the second vent 231. However, when the ambient temperature is greater than or equal to the operating temperature of the temperature-sensing glass bulb 24, the temperature-sensing glass bulb 24 breaks. The piston rod 25 moves under the pressure of the gas in the gas cylinder and the force of the fourth spring 26, and the second vent 231 releases the gas in the gas cylinder, ensuring the safety of the gas cylinder.

[0045] Turn the handwheel 3211 until the pressure cap 324 is disengaged from the valve body 1, i.e. Figure 5In the indicated state, the valve is fully open, and the gas in the cylinder flows to the outlet 12 through the second inlet channel 112. When the gas flow rate or the pressure difference between the inlet and outlet 12 is within the allowable value, the flow limiting valve 31 installed at the inlet of the second inlet channel 112 does not operate; however, when the gas flow rate or the gas pressure difference between the inlet and outlet 12 exceeds the set value, the flow limiting valve 31 operates to ensure that the gas in the cylinder flows normally from the second inlet channel 112 to the outlet 12. When the working pressure needs to be increased, the original flow limiting valve 31 is insufficient to meet the requirements. The handle is turned so that the operating lever 323 no longer presses against the limiting block 42. Under the action of the second spring 43, the limiting block 42 exits the limiting groove 411. At this time, the first valve 331 and the second valve 332 are separated. By turning the handwheel 3211 to adjust the distance between the first valve 331 and the second valve 332, the elastic force of the first spring 333 is adjusted to linearly adjust the valve size and limit the minimum gas flow value.

[0046] By comparing the position of the measuring ruler 5, the moving position and moving distance of the valve stem 321 can be clearly known, thereby accurately adjusting the magnitude of the spring force.

[0047] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this application. Various changes and modifications can be made to this application without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection claimed by this application is defined by the appended claims and their equivalents.

Claims

1. A valve for a vehicle-mounted compressed natural gas cylinder, characterized in that, include: The valve body includes an air inlet and an air outlet. The air inlet is adapted to be connected to a gas cylinder. The air inlet has a first air inlet channel and a second air inlet channel, and the second air inlet channel is connected to the air outlet. A safety device, sealed to the outlet end of the first air intake channel, opens the outlet end of the first air intake channel to release pressure when the pressure inside the gas cylinder exceeds a first set value or the ambient temperature exceeds a second set value; and The opening and closing device includes a flow limiting valve, a sealing mechanism, and an adjusting mechanism. The flow limiting valve is located at the second air inlet channel and restricts the gas flow rate within a third set value. The sealing mechanism includes a valve stem and a sealing element on the valve stem. The sealing element seals with the valve body to form a valve. The valve controls the opening and closing of the second air inlet channel and the air outlet. The adjusting mechanism cooperates with the flow limiting valve to reduce the third set value. The regulating mechanism further includes a first valve, a second valve, and a first spring. The sealing element is fixed to the first valve, the second valve is fixed to the valve stem, and the first valve and the second valve are connected by the first spring. The first spring provides pressure to make the sealing element press against the inner wall of the valve body. The opening and closing device also includes a connecting mechanism. The first valve can be fixedly connected to the second valve through the connecting mechanism. When the first valve and the second valve are fixedly connected, the valve stem drives the first valve and the second valve to move synchronously to control the size of the valve. When the first valve and the second valve are separated, the valve stem drives the second valve to move to adjust the elastic force of the first spring and restrict the gas flow rate within a fourth set value through the cooperation of the first spring and the sealing element.

2. The vehicle-mounted compressed natural gas cylinder valve as described in claim 1, characterized in that: The valve stem is internally threaded with an operating rod. The operating rod has a protrusion at one end near the first valve and a handle extending out of the valve body at the other end. The connecting mechanism is a locking block structure. The first valve has a first slot. Rotating the handle allows the protrusion to be inserted into the first slot, and the locking block structure fixes the first valve and the second valve together.

3. The vehicle-mounted compressed natural gas cylinder valve as described in claim 2, characterized in that: The first valve is further provided with a second slot and a third slot that are interconnected. The connecting mechanism includes a plug and a limiting block. The plug is fixed on the second valve and has a limiting groove. The limiting block is movably disposed in the second slot. The protrusion has a conical surface, and the end of the insert block near the protrusion has an inclined surface that mates with the conical surface. The valve stem can drive the insert block on the first valve to be inserted into the third slot. The protrusion is inserted into the first slot, and the inclined surface abuts against the conical surface. The limiting groove is connected to the second slot. When the protrusion forces the limiting block into the limiting groove, the limiting block engages with the insert block, and the first valve is fixedly connected to the second valve.

4. The vehicle-mounted compressed natural gas cylinder valve as described in claim 3, characterized in that: The connecting mechanism further includes a second spring. The limiting block is provided with a limiting part. One end of the second spring is connected to the limiting part, and the other end is connected to the inner wall of the first slot. The limiting part cooperates with the inner wall of the first slot to limit the extreme movement distance of the insertion block. The second spring forces the limiting block to reset.

5. The vehicle-mounted compressed natural gas cylinder valve as described in claim 1, characterized in that: The sealing mechanism also includes a pressure cap and a third spring, the valve stem passes through the pressure cap, and the pressure cap is threaded into the valve body; The valve body has a stroke cavity, and the pressure cap is adapted to move within the stroke cavity. One end of the third spring is connected to the inner wall of the stroke cavity, and the other end is connected to the pressure cap. When the pressure cap rotates to disengage from the valve body, the third spring forces the pressure cap to move the valve stem away from the first valve and fully open the valve.

6. The vehicle-mounted compressed natural gas cylinder valve as described in claim 5, characterized in that: The sealing mechanism further includes a first sealing ring, a second sealing ring, and a retaining ring. The first sealing ring and the retaining ring are disposed on the outer periphery of the valve stem and are sealed in conjunction with the pressure cap hole. The valve stem is also equipped with a handwheel extending out of the valve body, and the second sealing ring is disposed between the valve stem and the handwheel.

7. The vehicle-mounted compressed natural gas cylinder valve as described in claim 1, characterized in that: The safety device includes a first screw plug and a rupture disc. The first screw plug is located at the outlet end of the first air intake channel. A first vent is provided on the first screw plug. The first screw plug presses against the rupture disc, and the rupture disc is sealed to the valve body. The first set value is 52.5~57.75 MPa.

8. The vehicle-mounted compressed natural gas cylinder valve as described in claim 1, characterized in that: The safety device includes a second screw plug, a temperature-sensing glass bulb, a piston rod, and a fourth spring. The second screw plug is located at the outlet end of the first air intake channel, and a second vent is provided on the second screw plug. The temperature-sensing glass bulb is fixed inside the second screw plug by the fourth spring on the piston rod. The second set value is 105-115°C.

9. The vehicle-mounted compressed natural gas cylinder valve as described in any one of claims 1-8, characterized in that: The first air intake channel has two outlet ends. The safety device includes a first screw plug and a second screw plug, which are respectively sealed and connected to the two outlet ends of the first air intake channel. The first screw plug is provided with a rupture disc to limit the pressure value inside the gas cylinder. The second screw plug is provided with a temperature-sensing glass ball to set the maximum ambient temperature value. The valve body is provided with a distance measuring ruler to measure the movement distance of the valve stem.

Images