LNG pressure reduction regulator for automobile and vehicle

Abstract

The utility model relates to an LNG pressure reducing regulator for an automobile. The LNG pressure reducing regulator comprises a valve body, a gas path system and a water path system, the gas path system is used for conducting pressure reduction and flow control on natural gas, the input end of the gas path system is connected with an external gas cylinder and provided with a switching valve used for controlling on-off of a gas path and a pressure sensor used for detecting the gas pressure in the gas cylinder, and the rear end of the gas path system is provided with a proportional valve used for controlling the flow of the natural gas. The water path system is used for heating the pressure reduction regulator assembly, the input end and the output end of the water path system are both connected with an engine circulating cooling liquid system, so that engine circulating cooling liquid circularly flows in the water path system, and a temperature sensor used for detecting the temperature of the assembly is installed on a pipeline of the water path system. Through cooperative work of all the components, the LNG pressure reducing device is efficient, safe and reliable, and the requirement for precise control over the natural gas flow of an automobile under different working conditions is met.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of pressure reducing regulator, specifically to a kind of LNG pressure reducing regulator for automobile and vehicle. BACKGROUND

[0002] With the increasing demand for clean energy worldwide, liquefied natural gas (LNG) as a clean and efficient energy, its application in the field of automobile is increasingly widespread.LNG vehicles have the advantages of environmental protection, energy saving, etc., but the technical development of one of its core components, LNG pressure reducing regulator, faces many challenges.

[0003] Traditional LNG pressure reducing regulator mostly adopts mechanical pressure reducing structure, adopts double-cavity or multi-cavity form, and realizes stable supply of natural gas through multi-stage pressure reduction.However, this structure has many problems: first, the pressure reducing precision is insufficient, and the mechanical pressure reducer is difficult to realize accurate pressure control, especially when the working condition changes greatly, it cannot respond quickly, resulting in unstable gas supply pressure;Second, the low-temperature environment adaptability is poor, in cold regions, LNG pressure reducing regulator is prone to icing, clogging and other problems, which affects the gasification efficiency and pressure reducing effect;Third, the safety is insufficient, and the traditional pressure reducer lacks effective safety protection mechanism, once leakage or overpressure occurs, safety accidents may occur;Finally, the system complexity is high, in some existing technologies, LNG pressure reducing regulator has low integration with other systems (such as vaporizer, etc.), resulting in complex whole gas supply system, high installation and maintenance cost.

[0004] The prior art still has limitations and cannot fully meet the requirements of modern automobiles for efficient, stable and safe LNG pressure reducing regulator.Therefore, it is of great practical significance to develop a new type of LNG pressure reducing regulator for automobile to solve the problems in the prior art. SUMMARY

[0005] The utility model provides a kind of pressure reducing regulator for LNG vehicle and vehicle in view of the above technical problems existing in prior art, and it is a kind of efficient, safe and reliable LNG pressure reducing device through the cooperative work of each component to meet the accurate control demand of natural gas flow of automobile under different working conditions.

[0006] The utility model technical scheme is as follows:

[0007] A kind of LNG pressure reducing regulator for automobile, including valve body and the gas path system and water path system independently set in valve body;

[0008] The gas path system is used to reduce pressure and flow control of natural gas, its input end is connected with external gas cylinder and is provided with switch valve for controlling gas path on-off and pressure sensor for detecting gas pressure in the gas cylinder, and the rear end is provided with proportional valve for controlling natural gas flow;

[0009] The water route system is used for heating the pressure reducing regulator assembly, the input end and the output end of which are connected with the engine circulating cooling liquid system, so that the engine circulating cooling liquid circulates in the water route system, and a temperature sensor for detecting the assembly temperature is arranged on the pipeline of the water route system.

[0010] Further, the switch valve comprises a static core, a second plastic-coated assembly, a dynamic core, a second return spring, a cylindrical pin, a guide sleeve, a valve core and a second O-shaped sealing ring.

[0011] The static core is fixedly arranged in the second plastic-coated assembly, and the dynamic core drives the valve core to move in the guide sleeve in the axial direction through the cylindrical pin.

[0012] The second return spring is arranged between the static core and the dynamic core, and is used for providing a return force for the dynamic core.

[0013] The second O-shaped sealing ring is arranged outside the valve core, and is used for sealing the natural gas when the power is off.

[0014] Further, the proportional valve comprises a first plastic-coated assembly, a dynamic core assembly, a proportional valve body, a sealing steel ball, a proportional valve seat, a first O-shaped sealing ring, a first return spring, an upper shaft sleeve and a lower shaft sleeve.

[0015] The first plastic-coated assembly generates an electromagnetic force acting on the dynamic core assembly under the action of the current, so that the dynamic core assembly drives the sealing steel ball to move along the axis under the support of the inner holes of the upper shaft sleeve and the lower shaft sleeve, thereby adjusting the opening degree of the gas circuit.

[0016] The first return spring is arranged between the dynamic core assembly and the proportional valve body, and is used for providing a return force for the dynamic core assembly.

[0017] The first O-shaped sealing ring is arranged between the proportional valve seat and the proportional valve body, and is used for preventing the natural gas from leaking from the gap between the proportional valve seat and the proportional valve body.

[0018] Further, a sealing plug is arranged at the end of the gas circuit system.

[0019] Further, a safety valve is arranged at the output end of the proportional valve, and the safety valve is used for being automatically opened to release the excess pressure when the pressure abnormally rises.

[0020] Further, the safety valve comprises a safety valve body, a safety valve core, a pressure regulating spring and a pressure regulating plug.

[0021] The safety valve body is communicated with the output end of the proportional valve, and is internally provided with a guide structure for guiding the movement direction of the safety valve core.

[0022] The safety valve core and the pressure regulating spring are installed in the safety valve body, the pressure regulating spring cooperates with the safety valve core, the safety valve core is tightly matched with the safety valve body seat surface, and the safety valve is kept closed under the action of the gas pressure below the predetermined opening pressure.

[0023] The pressure regulating plug is installed on the safety valve body, the adjusting screw is arranged on the pressure regulating plug, the compression degree of the pressure regulating spring is adjusted by rotating the pressure regulating plug, the opening pressure of the safety valve is set, and the exhaust port is arranged on the pressure regulating plug.

[0024] Further, the waterway system adopts a U-shaped structure, and the water pipe joints at two ends are connected with the engine circulating coolant.

[0025] The utility model also provides a vehicle comprising the LNG pressure reducing regulator for automobile.

[0026] The technical scheme provided by the embodiment of the application can have the following beneficial effects:

[0027] From the above embodiment, it can be known that the application realizes accurate control of the natural gas flow through the proportional valve, meets the demand of the engine under different working conditions, the on-off valve controls the rapid on-off of the main valve through the action of the valve core, and complete sealing is ensured in the non-working state. The safety valve is automatically opened when the system pressure abnormally rises, and the excess pressure is released, thereby guaranteeing the safety of the system. The setting of the pressure sensor and the temperature sensor realizes real-time monitoring of the cylinder pressure and the assembly temperature, provides data support for the intelligent control system outside the system, and realizes dynamic adjustment. The waterway adopts a U-shaped structure, effectively prevents crystallization of parts caused by heat absorption of pressure release, and improves the reliability and durability of the system.

[0028] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and cannot limit the application. BRIEF DESCRIPTION OF DRAWINGS

[0029] The drawings incorporated into the specification and forming a part thereof show embodiments consistent with the application and together with the specification serve to explain the principles of the application.

[0030] Fig. 1 It is a main shaft diagram of the LNG pressure reducing regulator for automobile.

[0031] Fig. 2 It is a gas path structure schematic view of the LNG pressure reducing regulator for automobile.

[0032] Fig. 3 It is a water path structure schematic view of the LNG pressure reducing regulator for automobile.

[0033] Fig. 4It is a kind of automobile LNG pressure reducing regulator in proportional valve structure schematic diagram.

[0034] Fig. 5 It is a kind of automobile LNG pressure reducing regulator in switch valve structure schematic diagram.

[0035] Fig. 6 It is a kind of automobile LNG pressure reducing regulator in safety valve structure schematic diagram.

[0036] In the figure: switch valve 1, proportional valve 2, temperature sensor 3, safety valve 4, gas outlet pipe joint 5, valve body 6, water pipe joint 7, air inlet pipe joint 8, pressure sensor 9, sealing plug 10, upper shaft sleeve 11, first plastic wrapping assembly 12, first return spring 13, moving iron core assembly 14, lower shaft sleeve 15, proportional valve body 16, first O-ring 17, sealing steel ball 18, proportional valve seat 19, static iron core 21, second plastic wrapping assembly 22, moving iron core 23, second return spring 24, cylindrical pin 25, guide sleeve 26, switch valve spool 27, second O-ring 28, pressure regulating plug 31, pressure regulating spring 32, safety valve spool 33, safety valve body 34. DETAILED DESCRIPTION

[0037] The exemplary embodiments will be described in detail herein with reference to the attached drawings. In the following description, the same numbers are used to indicate the same or similar components. The following exemplary embodiments described in this specification encompass all implementations having equivalent or similar processes, effects and / or results.

[0038] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0039] It should be understood that although the terms first, second, third, etc. can be used herein to describe various information, these terms are not intended to denote a particular order or hierarchy. These terms are used only to distinguish one from another. For example, a first information can be termed a second information, and similarly, a second information can be termed a first information, without departing from the scope of the present application. As used herein, the word "if" can be interpreted to mean "when" or "upon" or "in response to determining" depending on the context.

[0040] As Figs. 1-6The application relates to an LNG pressure reducing regulator for an automobile, which comprises a valve body, a gas path system and a water path system arranged in the valve body and independent of each other; the gas path system is used for reducing the pressure and controlling the flow of natural gas, an input end of the gas path system is connected with an external gas cylinder, a switch valve 1 for controlling the opening and closing of the gas path and a pressure sensor 9 for detecting the gas pressure in the gas cylinder are arranged on the input end, and a proportional valve 2 for controlling the flow of natural gas is arranged at the rear end; the water path system is used for heating the pressure reducing regulator assembly, and the input end and the output end of the water path system are connected with an engine circulating cooling liquid system, so that the engine circulating cooling liquid circulates in the water path system, and a temperature sensor 3 for detecting the temperature of the assembly is arranged on a pipeline of the water path system.

[0041] Specifically, the valve body 6 is integrally cast by using an aluminum alloy, a copper alloy or stainless steel as a main structure, and the valve body 6 is internally provided with the independent gas path system and the water path system; the gas path system is used for reducing the pressure and controlling the flow of natural gas to meet the requirements of the engine under different working conditions; and the water path system is used for heating the pressure reducing regulator assembly to prevent crystallization of parts caused by heat absorption due to pressure release and ensure normal operation of the equipment.

[0042] As shown in Figs. 1-2 In the application, the proportional valve 2 is arranged at the rear end of the gas path system, the proportional valve 2 comprises a first plastic-coated assembly 12, a moving iron core assembly 14, a proportional valve body 16, a sealing steel ball 18, a proportional valve seat 19, a first O-shaped sealing ring 17, a first reset spring 13, an upper shaft sleeve 11 and a lower shaft sleeve 15, different intensity electromagnetic forces are generated on the moving iron core assembly 14 by changing the current size of the first plastic-coated assembly 12, the moving iron core assembly 14 moves along the axis under the support of the inner holes of the upper shaft sleeve 11 and the lower shaft sleeve 15 and drives the sealing steel ball 18 to move, the movement of the sealing steel ball 18 is separated from the proportional valve seat 19, and the precise control of the flow of natural gas is realized by precisely adjusting the opening degree. The output end of the proportional valve 2 is further provided with a gas outlet pipe joint 5 and a safety valve 4. The safety valve 4 is automatically opened when the system pressure abnormally rises (i.e. the output gas pressure of the proportional valve 2 exceeds the predetermined threshold value) to release the excess pressure and guarantee the safe operation of the whole system.

[0043] As shown in Fig. 4In the ratio valve 2, the moving iron core assembly 14 can move along the axial direction under the support of the inner holes of the upper shaft sleeve 11 and the lower shaft sleeve 15. When the first plastic assembly 12 is energized to generate an electromagnetic force, the moving iron core assembly 14 moves along the axial direction under the action of the electromagnetic force. The movement of the moving iron core assembly 14 drives the sealing steel ball 18 to separate from the ratio valve seat 19. By adjusting the opening degree between the sealing steel ball 18 and the ratio valve seat 19, the flow of natural gas is adjusted. The larger the opening degree, the greater the flow of natural gas; the smaller the opening degree, the smaller the flow of natural gas. The first return spring 13 is located between the moving iron core assembly 14 and the ratio valve body 16, and is used to provide a restoring force to the moving iron core assembly 14. When the electromagnetic force disappears, the first return spring 13 pulls the moving iron core 14 back to the original position, so that the sealing steel ball 18 tightly abuts against the ratio valve seat 19 again, and the gas path is cut off. The first O-shaped sealing ring 17 is arranged between the ratio valve seat 19 and the ratio valve body 16, and plays a sealing role to prevent natural gas from leaking from the gap between the ratio valve seat 19 and the ratio valve body 16, and to ensure the sealing performance of the gas path.

[0044] As Figs. 1-2 In the gas path system front end, the on-off valve 1 is provided, which is a key component for realizing the rapid on-off of natural gas, and includes a static iron core 21, a second plastic assembly 22, a moving iron core 23, a second return spring 24, a cylindrical pin 25, a guide sleeve 26, an on-off valve spool 27, and a second O-shaped sealing ring 28. The static iron core 21 is fixed in the guide sleeve 26 and does not move. The moving iron core 23 is located in the cavity of the guide sleeve 26 and can slide along the axial direction in the guide sleeve 26. When the second plastic assembly 22 is energized, the moving iron core 23 approaches the static iron core 21 under the action of the electromagnetic force and overcomes the spring force of the second return spring 24. The moving iron core 23 drives the on-off valve spool 27 to move simultaneously through the cylindrical pin 25. The on-off valve spool 27 separates from the sealing cone surface, and the on-off valve 1 is opened. When the power is off, the moving iron core 23 returns to the original position under the action of the spring force of the second return spring 24. The movement of the moving iron core 23 drives the on-off valve spool 27 to move together through the cylindrical pin 25. The second O-shaped sealing ring 28 outside the on-off valve spool 27 tightly abuts against the sealing cone surface again, the gas path is cut off, and the on-off valve 1 is closed. The on-off valve 1 is provided with an air inlet pipe joint 8 and a pressure sensor 9 at the front end. The pressure sensor 9 can monitor the pressure in the gas cylinder in real time and transmit data to the intelligent control system, so as to provide a basis for dynamic adjustment of the system and enable the pressure regulator to adjust the working state in a timely manner according to the change of the gas cylinder pressure, thereby ensuring the stable supply of natural gas.

[0045] As Figs. 1-2 In the gas path system middle section, a sealing plug 10 is provided for sealing the natural gas flowing through the valve body 6, reducing the processing difficulty of the gas path, and improving the sealing performance and reliability of the equipment.

[0046] AsFig. 5 Among them, the safety valve 4 is an important part of the safety of the system, mainly including safety valve body 34, safety valve core 33, pressure regulating spring 32 and pressure regulating plug 31. The safety valve body 34 is communicated with the output end of the proportional valve 2, bears the natural gas pressure, and is provided with a guide structure inside for guiding the movement direction of the safety valve core 33, ensuring that it can accurately move along the set path. The safety valve core 33 is installed in the safety valve body 34 and tightly fits the seat surface of the safety valve body 34. In the normal working state, the safety valve core 33 is in the closed state, preventing natural gas from passing through. When the system pressure exceeds the set value, the safety valve core 33 can automatically open, and the natural gas is discharged through the channel between the safety valve core 33 and the safety valve body 34, thereby releasing excess pressure, reducing the system pressure, and ensuring the safe operation of the entire system. The pressure regulating spring 32 is arranged in the safety valve body 34 and cooperates with the safety valve core 33 for applying a pre-tightening force. The pre-tightening force keeps the safety valve core 33 in the closed state until the system pressure reaches the set opening pressure. By adjusting the compression degree of the pressure regulating spring 32, the opening pressure of the safety valve 4 can be set to meet the safety requirements under different working conditions. The pressure regulating plug 31 is installed on the safety valve body 34, and an adjusting thread is arranged thereon. By rotating the pressure regulating plug 31, the compression degree of the pressure regulating spring 32 can be adjusted, so that the opening pressure of the safety valve 4 can be accurately set. The pressure regulating plug 31 is also provided with a drain port, and when the safety valve 4 is opened, the natural gas is discharged through the drain port, further reducing the system pressure.

[0047] As Figs. 1-3 Among them, the waterway system adopts a U-shaped structure, and the water pipe joints 7 at both ends are connected with the engine circulating coolant. The coolant circulates in the waterway to provide heating for the pressure reducing regulator assembly, preventing crystallization of parts due to excessive low temperature caused by heat absorption during pressure reduction. The U-shaped waterway is provided with a temperature sensor 3 on the side surface for real-time monitoring of the temperature of the assembly, ensuring that it is within the appropriate temperature range and ensuring the normal operation of the equipment.

[0048] The working process / working principle of the LNG pressure reducing regulator for vehicle is as follows: LNG enters the valve body 6 of the LNG pressure reducing regulator through the gas inlet joint 8. At this time, the switch valve 1 is powered on, the moving iron core 23 is close to the static iron core 21 against the spring force of the second return spring 24 under the action of the electromagnetic force, the moving iron core 23 drives the switch valve spool 27 to move simultaneously through the cylindrical pin 25, the switch valve spool 27 is separated from the sealing cone surface, and the switch valve 1 is in an open state. When the first plastic assembly 12 of the proportional valve 2 is powered on to generate an electromagnetic force, the moving iron core assembly 14 moves along the axial direction under the action of the electromagnetic force, the movement of the moving iron core assembly 14 drives the sealing steel ball 18 to separate from the proportional valve seat 19, the proportional valve 2 adjusts the valve opening between the sealing steel ball 18 and the proportional valve seat 19 according to the pre-set pressure parameter and reduces the pressure of the LNG entering to reduce the pressure from a high pressure state to a relatively low intermediate pressure range. The LNG after pressure reduction is delivered to the downstream equipment through the gas outlet joint 5. At the same time, the cooling liquid of the engine circulating cooling liquid system connected by the water joint 7 circulates in the water system to effectively prevent the crystallization of parts caused by pressure release heat absorption. The pipeline of the water system is provided with the temperature sensor 3 for detecting the temperature of the assembly. The front end of the gas path is provided with the pressure sensor 9 for detecting the gas pressure in the gas cylinder. When the system pressure exceeds the set opening pressure, the safety valve 4 is automatically opened to discharge the excess LNG and reduce the system pressure. When the assembly stops working, the switch valve 1 is powered off, the moving iron core 23 returns to the original position under the action of the spring force of the second return spring 24, the movement of the moving iron core 23 drives the switch valve spool 27 to move through the cylindrical pin 25, the second O-shaped sealing ring 28 outside the switch valve spool 27 re-closely fits with the sealing cone surface, the gas path is cut off, and the switch valve 1 is closed. The LNG pressure reducing regulator can efficiently and safely reduce the high-pressure LNG to the required low-pressure state, while ensuring the stable operation and safety protection of the system.

[0049] Correspondingly, the application also provides a vehicle comprising the LNG pressure reducing regulator for vehicle.

[0050] Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the application be limited only by the scope of the claims, including any amendments thereof, and other equivalents to the claims. It is intended that the application not be limited to the examples and / or options described herein, but that the application can be practiced with one or more examples and / or options and equivalents thereof.

[0051] It is to be understood that the application is not limited to the precise construction and methods described above and shown in the attached drawings, and that various modifications and changes can be made by those skilled in the art without departing from the scope of the application. The scope of the application is to be determined only by the appended claims, including any amendments thereto, and other equivalents to the claims.

Claims

1. An LNG pressure reducing regulator for an automobile, characterized by comprising: The valve body (6) and the independent gas path system and water path system arranged inside the valve body; The gas path system is used for pressure reduction and flow control of natural gas, the input end is connected with an external gas cylinder, a switch valve (1) for controlling the opening and closing of the gas path and a pressure sensor (9) for detecting the gas pressure in the gas cylinder are arranged, and the rear end is provided with a proportional valve (2) for controlling the flow of natural gas; The water path system is used for heating the pressure reduction regulator assembly, the input end and the output end are connected with the engine circulating cooling liquid system, so that the engine circulating cooling liquid circulates in the water path system, and a temperature sensor (3) for detecting the temperature of the assembly is arranged on the pipeline of the water path system.

2. The LNG pressure reducing regulator for a vehicle according to claim 1, wherein The switch valve (1) comprises a static core (21), a second plastic packaging assembly (22), a moving core (23), a second reset spring (24), a cylindrical pin (25), a guide sleeve (26), a valve core (27) and a second O-shaped sealing ring (28). The static core (21) is fixedly arranged in the second plastic packaging assembly (22), the moving core (23) drives the valve core (27) to move in the guide sleeve (26) along the axial direction through the cylindrical pin (25). The second reset spring (24) is arranged between the static core (21) and the moving core (23), and is used for providing a reset force for the moving core (23). The second O-shaped sealing ring (28) is arranged outside the valve core (27), and is used for sealing natural gas when power is off.

3. The LNG pressure reducing regulator for a vehicle according to claim 1, wherein The proportional valve (2) comprises a first plastic packaging assembly (12), a moving core assembly (14), a proportional valve body (16), a sealing steel ball (18), a proportional valve seat (19), a first O-shaped sealing ring (17), a first reset spring (13), an upper shaft sleeve (11) and a lower shaft sleeve (15). The first plastic packaging assembly (12) generates electromagnetic force under the action of current and acts on the moving core assembly (14), so that the moving core assembly (14) drives the sealing steel ball (18) to move along the axis under the support of the inner holes of the upper shaft sleeve (11) and the lower shaft sleeve (15), so as to adjust the opening degree of the gas path. The first reset spring (13) is arranged between the moving core assembly (14) and the proportional valve body (16), and is used for providing a reset force for the moving core assembly (14). The first O-shaped sealing ring (17) is arranged between the proportional valve seat (19) and the proportional valve body (16), and is used for preventing natural gas from leaking from the gap between the proportional valve seat (19) and the proportional valve body (16).

4. The LNG pressure reducing regulator for vehicles according to claim 1, wherein A sealing plug (10) is arranged at the end of the gas path system.

5. The LNG pressure reducing regulator for vehicles according to claim 1, wherein A safety valve (4) is arranged at the output end of the proportional valve (2), and the safety valve (4) is used for automatically opening to release excess pressure when the pressure abnormally rises.

6. The LNG pressure reducing regulator for vehicles according to claim 5, wherein The safety valve (4) comprises a safety valve body (34), a safety valve core (33), a pressure regulating spring (32) and a pressure regulating plug (31). The safety valve body (34) is communicated with the output end of the proportional valve (2), and is provided with a guide structure inside, which is used for guiding the movement direction of the safety valve core (33). The safety valve core (33) and the pressure regulating spring (32) are installed in the safety valve body (34), the pressure regulating spring (32) cooperates with the safety valve core (33), the safety valve core (33) is tightly fitted with the safety valve body (34) seat surface, so that the safety valve (4) is kept closed under the action of the gas pressure below the predetermined opening pressure; The pressure regulating plug (31) is installed on the safety valve body (34), and is provided with adjusting threads, the compression degree of the pressure regulating spring (32) is adjusted by rotating the pressure regulating plug (31), so that the opening pressure of the safety valve (4) is set; the pressure regulating plug (31) is provided with a discharge port, when the safety valve (4) is opened, the medium is discharged through the discharge port, and the system pressure is reduced.

7. The LNG pressure reducing regulator for vehicles according to claim 1, wherein The waterway system adopts a U-shaped structure, and the water pipe joints (7) at two ends are connected with engine circulating cooling liquid.

8. A vehicle characterized by comprising: The LNG pressure reducing regulator for automobile comprises a LNG pressure reducing regulator for automobile according to any one of claims 1-7.

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