35MPa compressed natural gas supply system and method for vehicle

Abstract

The invention relates to the technical field of compressed natural gas automobiles, and discloses a 35MPa compressed natural gas supply system and method for an automobile, and the system comprises a gas cylinder cabin, a gas filling cabin and an engine cabin; a plurality of carbon fiber fully-wound gas cylinders with the rated pressure of 35MPa are mounted in the gas cylinder cabin; a cylinder valve is integrated with a flow sensor, a temperature sensor and a pressure sensor; a gas filling port, a one-way valve, a high-pressure pressure gauge, a high-pressure stop valve, a high-pressure precision filter and a pipeline overcurrent protection valve are mounted in the gas filling cabin, the one-way valve and the high-pressure stop valve are jointly connected to one end of the pipeline overcurrent protection valve, and the other end of the pipeline overcurrent protection valve is connected with a high-pressure gas storage bottle; a high-pressure electromagnetic valve and a high-pressure pressure reducer are mounted in the engine compartment; the other end of the high-pressure electromagnetic valve is connected with the high-pressure precision filter; according to the scheme, the cabin thought design is adopted, the integration and modularization degree is high, the combination requirements of different gas cylinder sets can be met, installation and layout of different vehicle types are facilitated, a 35 MPa compressed natural gas automobile can be smoothly implemented, and the scheme is particularly suitable for being used by a 35 MPa compressed natural gas truck.

Description

Technical Field

[0001] The present invention relates to the technical field of compressed natural gas vehicles, and in particular to a vehicle-used 35MPa compressed natural gas supply system and method. Background Art

[0002] Compressed natural gas vehicles are becoming popular and promoted worldwide due to their low emissions, high economy and helping to get rid of dependence on oil.

[0003] At present, the rated working pressure of CNG vehicles in my country is 20MPa (the maximum in foreign countries is 25MPa), and the gas storage capacity per unit volume is relatively low, which greatly affects the vehicle's driving range and hinders the further promotion and application of CNG vehicles. Therefore, from a long-term development perspective, it is an inevitable trend to increase the rated working pressure of CNG vehicles and increase the gas storage capacity per unit volume. For example, the use of high-pressure gas cylinders can significantly increase the storage density of natural gas, further increase the vehicle's driving range, and expand the scope of application of natural gas vehicles.

[0004] The gas supply system of existing CNG vehicles is designed to adapt to lower rated working pressures. When the rated working pressure of CNG vehicles is increased, if this system is still used, the system as a whole and its components cannot withstand higher pressures, which will directly lead to a decrease in the safety and reliability of the gas supply. In addition, the low-pressure system is prone to problems such as gas leakage, loose connections and component damage when operating under high-pressure conditions, affecting the normal operation and safety of the vehicle. Therefore, the low-pressure CNG gas supply system cannot meet the operating conditions of CNG vehicles with increased rated working pressures, and cannot be directly applied to high-pressure CNG vehicles. A new gas supply system is urgently needed to adapt. Summary of the invention

[0005] The present invention aims to provide a 35MPa compressed natural gas supply system for vehicles, avoiding the conventional static system design method and adopting a dynamic system design to adapt to compressed natural gas vehicles with increased rated working pressure, so that the system not only has component selection that meets high-pressure operation, but also can cope with various working conditions during vehicle driving, so as to ensure the long-term stable operation of the vehicle over longer distances and more complex roads under high-pressure environments.

[0006] The basic scheme provided by the present invention is: a 35MPa compressed natural gas supply system for vehicles, including a gas cylinder compartment, a gas filling compartment and an engine compartment;

[0007] A number of high-pressure gas cylinders are installed in the gas cylinder cabin; each of the high-pressure gas cylinders is a carbon fiber fully wrapped gas cylinder with a rated working pressure of 35MPa, and is equipped with a cylinder valve, which integrates a flow sensor, a temperature sensor and a pressure sensor, and is used to automatically cut off the gas supply and safely release the pressure under abnormal conditions; the high-pressure gas cylinders are connected to form a cylinder group according to the corresponding capacity and arrangement determined by the preset strategy, and a high-pressure pressure sensor is provided at the connection end of the cylinder group to collect the gas storage pressure of the entire cylinder group;

[0008] The gas filling cabin is equipped with a pipeline for filling the high-pressure gas storage cylinder with high-pressure natural gas and a first pipeline for supplying gas to the engine; the pipeline for filling the high-pressure gas storage cylinder with high-pressure natural gas includes a gas filling port and a one-way valve connected in sequence; the first pipeline for supplying gas to the engine includes a high-pressure shut-off valve and a high-pressure precision filter connected in sequence, and also includes a pipeline overcurrent protection valve with electromagnetic automatic reset and automatically cutting off the gas supply under abnormal circumstances; the one-way valve and the high-pressure shut-off valve are jointly connected to one end of the pipeline overcurrent protection valve, and the other end of the pipeline overcurrent protection valve is connected to the bottle group; the pipeline where the one-way valve is connected to the pipeline overcurrent protection valve is connected to a high-pressure pressure gauge for displaying the pipeline gas storage pressure; wherein the gas filling port, the one-way valve, the high-pressure pressure gauge and the high-pressure shut-off valve are integrated on a panel assembly;

[0009] A second pipeline for supplying air to the engine is installed in the engine compartment; the second pipeline for supplying air to the engine includes a high-pressure solenoid valve and a high-pressure pressure reducer connected to one end of the high-pressure solenoid valve, and is connected to the engine through the high-pressure pressure reducer; the other end of the high-pressure solenoid valve is connected to a high-pressure precision filter;

[0010] Among them, several high-pressure gas storage cylinders in the gas cylinder cabin are connected by the first high-pressure steel pipe, and other pipelines are connected by the second high-pressure steel pipe;

[0011] The gas cylinder cabin, the gas filling cabin and the engine cabin are all equipped with gas probes and / or temperature probes, and all the gas probes and temperature probes are connected to the leakage alarm.

[0012] The present invention is based on a 35MPa compressed natural gas gas supply system for a vehicle, and also provides a layout method of the 35MPa compressed natural gas gas supply system for a vehicle, wherein the 35MPa compressed natural gas gas supply system for a vehicle is installed on a vehicle;

[0013] The gas cylinder compartment and the gas filling compartment are independent. The gas cylinder compartment is installed behind and close to the front of the vehicle, the gas filling compartment is installed at the lower part of either side of the gas cylinder compartment along the width direction of the vehicle, and the panel assembly is installed in the gas filling compartment; the engine compartment is installed under the front of the vehicle, and a built-in space for the vehicle engine is reserved for integration with the vehicle engine.

[0014] The working principle and advantages of the present invention are as follows: high-pressure natural gas is injected into the high-pressure gas storage cylinder in the gas cylinder cabin through the gas filling port, the one-way valve, the high-pressure pressure gauge and the pipeline over-current protection valve of the gas filling cabin; when the vehicle needs it, the high-pressure natural gas is sent from the high-pressure gas storage cylinder in the gas cylinder cabin through the pipeline over-current protection valve, the high-pressure stop valve and the high-pressure precision filter of the gas filling cabin, and is sent to the high-pressure solenoid valve and the high-pressure pressure reducer in the engine cabin, and finally enters the engine.

[0015] Compared with the existing technology, this solution provides a new compressed natural gas gas supply system. Different from the conventional static system design method that only considers the pressure environment of the vehicle itself, it takes into account that after the rated working pressure of compressed natural gas vehicles increases, the vehicle's cruising range is improved, the driving distance is longer, the road conditions are more complex, and the vehicle's operating environment is more changeable, which has a great impact on the vehicle's gas supply system and the vehicle itself. Therefore, a dynamic system design is adopted to adapt to compressed natural gas vehicles with increased rated working pressure, so that the system not only has component selection that meets high-pressure operation, but also can cope with various working conditions during vehicle driving, so as to ensure the long-term stable operation of the vehicle over longer distances and more complex roads under high-pressure environments.

[0016] This solution adopts a cabin design concept, with a high degree of integration and modularization, which is suitable for the combination requirements of different gas cylinder groups, further facilitating the installation layout of different vehicle models, and helping to quickly maintain under various complex operating conditions, and restore the safety of the vehicle and system in a short time, thereby enabling the smooth implementation of 35MPa compressed natural gas vehicles, which is especially suitable for 35MPa compressed natural gas trucks.

[0017] Through the newly developed 35MPa compressed natural gas cylinder, combined with the 35MPa gas supply system of this solution, the natural gas storage capacity can be increased by about 75% while the vehicle's gas storage volume remains unchanged, greatly increasing the vehicle's driving range on a single refueling, and solving the current problem of short driving range of compressed natural gas vehicles. This will greatly enhance the competitiveness of my country's compressed natural gas vehicles and have great economic and social benefits.

[0018] The design preferentially selects relevant pipe and valve components that can withstand a pressure of 35MPa, fully meeting the system's long-term pressure-resistant safety requirements, adding a system bottle valve current limiting function, an integrated design of temperature / pressure dual protection functions, a common current limiting function design of the pipeline overcurrent protection valve, and a simple and reliable pipeline design. The high-pressure natural gas in the gas cylinder can be safely and reliably transported to the vehicle's natural gas engine, and the pipe and valve action mode during the gas supply and transportation process dynamically matches the changing high-pressure operating conditions, meeting the reliable operation of vehicles, especially trucks, during long-distance driving on complex roads.

[0019] The layout of the cabin, which is independent of the front and the compartment, improves the flexibility and reliability of the layout of the entire system on the vehicle. Especially for trucks carrying important goods, the air supply system can be effectively isolated from the goods, avoiding the mutual influence between the air supply system and the loaded goods, and improving transportation safety. In addition, the favorable position settings of various panels and valves allow drivers and passengers to easily operate the valves in different situations, ensuring the safe operation of the system and timely handling of faults, further improving the safety of the system. The pipeline design of the entire air supply system comprehensively considers the road conditions and environmental factors of the vehicle to ensure the safe, reliable and efficient operation of the system. By adopting steel pipe connections, appropriate elbows and transition sections, shock absorption, temperature and corrosion resistance, high-efficiency filtration and other measures, the smoothness and stability of gas flow are ensured, which can effectively cope with various road conditions and environmental challenges, improve the performance and service life of the air supply system, and especially ensure the reliable operation of vehicles, especially heavy trucks, when driving long distances on complex roads, across provinces, and with large differences in environmental changes. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of a 35MPa compressed natural gas supply system for a vehicle provided in Embodiment 1 of the present invention;

[0021] Figure 2 A schematic diagram of the layout of a 35MPa compressed natural gas supply system for a vehicle provided in the second embodiment of the present invention;

[0022] Figure 3 Schematic diagram of the layout of the bottle group provided in the third embodiment of the present invention Figure 1 ;

[0023] Figure 4 Schematic diagram of the layout of the bottle group provided in the third embodiment of the present invention Figure 2 . DETAILED DESCRIPTION

[0024] The following is a further detailed description through specific implementation methods:

[0025] The marks in the drawings of the specification include: gas filling port 1, one-way valve 2, high-pressure pressure gauge 3, pipeline overcurrent protection valve 4, second high-pressure steel pipe 5, first high-pressure steel pipe 6, high-pressure gas storage bottle 7, bottle valve 8, high-pressure pressure sensor 9, high-pressure stop valve 10, high-pressure precision filter 11, high-pressure coarse filter 111, high-pressure solenoid valve 12, high-pressure pressure reducer 13, three-way connector 1 14, three-way connector 2 15, probe 16, temperature probe 17, leakage alarm 18.

[0026] Embodiment 1

[0027] Basically as attached Figure 1 Shown: A 35MPa compressed natural gas supply system for a vehicle, including a gas cylinder compartment, a gas filling compartment and an engine compartment.

[0028] A number of high-pressure gas cylinders 7 are installed in the gas cylinder cabin; each of the high-pressure gas cylinders 7 is a carbon fiber fully wrapped gas cylinder with a rated working pressure of 35 MPa, and is equipped with a cylinder valve 8, the cylinder valve 8 integrates a flow sensor, a temperature sensor and a pressure sensor, which are used to automatically cut off the gas supply and safely release the pressure under abnormal circumstances; a number of high-pressure gas cylinders 7 are connected to form a cylinder group according to the corresponding capacity and arrangement determined by a preset strategy, and a high-pressure pressure sensor 9 is provided at the connection end of the cylinder group for collecting the overall gas storage pressure of the cylinder group.

[0029] Specifically, the bottle valve 8 has a flow limiting function. When there is a leak or burst in the downstream pipeline, the valve can automatically cut off the gas supply; the bottle valve 8 has a temperature / pressure dual safety protection function. When the temperature or pressure of the natural gas in the gas cylinder exceeds the set value, the pressure can be safely released through this valve to avoid safety accidents such as gas cylinder explosion. The bottle group connection pipeline adopts a parallel / series design. The pipeline design is simple and reliable. The specific connection is described in the layout method. Several high-pressure gas storage cylinders 7 in the gas cylinder cabin are connected by a first high-pressure steel pipe 6. The first high-pressure steel pipe 6 adopts a high-pressure resistant 1 / 2-inch stainless steel pipe. The high-pressure resistant 1 / 2-inch stainless steel pipe can withstand pressures of up to hundreds or even thousands of pounds per square inch (psi), ensuring the safe transmission of natural gas, and has strong corrosion resistance. It can operate stably for a long time in a humid and corrosive environment. It is very suitable for the possible changing environment during long-distance transportation by trucks, with a long service life and low maintenance cost.

[0030] The gas filling cabin is equipped with a pipeline for filling the high-pressure gas storage cylinder 7 with high-pressure natural gas and a first pipeline for supplying gas to the engine;

[0031] The pipeline for filling the high-pressure gas cylinder 7 with high-pressure natural gas includes a gas filling port 1 and a one-way valve 2 connected in sequence, which can be reliably connected through an equal-diameter straight-through joint;

[0032] The first pipeline for supplying air to the engine includes a high-pressure shutoff valve 10 and a high-pressure precision filter 11 connected in sequence. Specifically, the high-pressure precision filter 11 has a filtration accuracy greater than 0.3μ, a filtration efficiency greater than 99.99%, and meets the maximum flow demand of the engine. When the air supply system of this scheme is arranged on a vehicle, the gas filling cabin is usually close to the outside of the vehicle and has a low position. The high-pressure shutoff valve 10 and the high-pressure precision filter 11 are arranged in the gas filling cabin for easy maintenance.

[0033] The first pipeline for supplying gas to the engine also includes a pipeline overcurrent protection valve 4 with electromagnetic automatic reset and automatically cuts off the gas supply under abnormal circumstances; specifically, when there is a leak or burst in the downstream pipeline, the pipeline overcurrent protection valve 4 can automatically cut off the gas supply, forming a double protection with the bottle valve 8 with a current limiting function. The valve adopts an electromagnetic automatic reset design, which reduces the necessity of human intervention. After a short-term fault in the system, it can respond quickly and reset quickly, avoiding long-term system interruption, improving the reliability and efficiency of the system, reducing maintenance costs, and ensuring safe operation.

[0034] The one-way valve 2 and the high-pressure stop valve 10 are jointly connected to one end of the pipeline overcurrent protection valve 4, and the other end of the pipeline overcurrent protection valve 4 is connected to the high-pressure gas storage cylinder 7; the pipeline connecting the one-way valve 2 to the pipeline overcurrent protection valve 4 is connected with a high-pressure pressure gauge 3 for displaying the pipeline gas storage pressure; the pipeline for filling the high-pressure gas storage cylinder 7 with high-pressure natural gas also includes a three-way connector 14 and a three-way connector 2 15, the three-way connector 14 is respectively connected to the one-way valve 2, the high-pressure pressure gauge 3 and the three-way connector 2 15, and the other two ends of the three-way connector 2 15 are respectively connected to the pipeline overcurrent protection valve 4 and the high-pressure stop valve 10, and the equal-diameter three-way connector is used to connect. When the system is arranged on the vehicle, the reliability of the pipeline connection is improved, and the loose joint caused by vibration caused by the vehicle itself and the driving road conditions during long-term transportation of the truck can be avoided.

[0035] The gas filling port 1, the one-way valve 2, the high-pressure pressure gauge 3 and the high-pressure stop valve 10 are integrated on a panel assembly, which is highly integrated and modular. It is convenient for drivers and passengers to operate each valve and check the gas storage pressure while operating the valve, which is conducive to handling emergencies.

[0036] A second pipeline for supplying air to the engine is installed in the engine compartment; the second pipeline for supplying air to the engine includes a high-pressure solenoid valve 12, and a high-pressure pressure reducer 13 connected to one end of the high-pressure solenoid valve 12, and is connected to the engine via the high-pressure pressure reducer 13; the other end of the high-pressure solenoid valve 12 is connected to a high-pressure precision filter 11.

[0037] In this embodiment, the pipeline high-pressure solenoid valve 12 is powered by 24V; the maximum working pressure of all pipe and valve components, including the first high-pressure steel pipe 6, the second high-pressure steel pipe 5, the bottle valve 8, the one-way valve 2, the high-pressure stop valve 10, the high-pressure precision filter 11, the high-pressure pressure reducer 13 and the pipeline overcurrent protection valve 4 are 1.25 times the rated working pressure of 35MPa, which fully meets the system pressure safety requirements.

[0038] The gas cylinder cabin, gas filling cabin and engine cabin are all equipped with gas probes 16 and / or temperature probes 17. All gas probes 16 and temperature probes 17 are connected to leakage alarms 18 for monitoring the conditions of each cabin, so as to facilitate timely handling of subsequent faults.

[0039] In this embodiment, a 35MPa compressed natural gas supply system for vehicle is designed with a cabin concept, with a high degree of integration and modularization. It can adapt to the combination requirements of different gas cylinder groups to further facilitate the installation layout of different vehicle models, so that 35MPa compressed natural gas vehicles can be smoothly implemented, and it is especially suitable for 35MPa compressed natural gas trucks.

[0040] Through the newly developed 35MPa compressed natural gas cylinder, combined with the 35MPa gas supply system of this solution, the natural gas storage capacity can be increased by about 75% while the vehicle's gas storage volume remains unchanged, greatly increasing the vehicle's driving range on a single refueling, and solving the current problem of short driving range of compressed natural gas vehicles. This will greatly enhance the competitiveness of my country's compressed natural gas vehicles and have great economic and social benefits.

[0041] The design preferentially selects relevant pipe and valve components that can withstand a pressure of 35MPa, fully meeting the system's pressure-resistant safety requirements, adding a flow-limiting function to the system's bottle valve, an integrated design of temperature / pressure dual protection functions, a common flow-limiting function design for the pipeline overcurrent protection valve, and a simple and reliable pipeline design, which can safely and reliably transport the high-pressure natural gas in the gas cylinder to the vehicle's natural gas engine.

[0042] Embodiment 2

[0043] Different from the first embodiment, based on the vehicle 35MPa compressed natural gas gas supply system described in the first embodiment, a layout method of the vehicle 35MPa compressed natural gas gas supply system is provided; the above vehicle 35MPa compressed natural gas gas supply system is installed on the vehicle, such as Figure 2 As shown; the vehicles are generally heavy trucks.

[0044] The gas cylinder compartment and the gas filling compartment are independent, the gas cylinder compartment is installed behind and close to the front of the vehicle, the gas cylinder compartment is adapted to the size of the vehicle and is provided with a number of heat dissipation holes; the gas cylinder compartment can be preferably sized 1400*2400*2280mm, which can be adapted to various conventional truck models; the gas filling compartment is installed at the lower part of any side of the gas cylinder compartment along the width direction of the vehicle, and the panel assembly is installed in the gas filling compartment. The position is reasonably set, which is convenient for the driver and passengers to perform corresponding valve opening and closing operations according to different situations. At the same time, it is also convenient for the driver and passengers to quickly close the corresponding valves in case of emergencies, eliminate faults, and improve system safety; the engine compartment is installed under the front of the vehicle, and a built-in space for the vehicle engine is reserved for integration with the vehicle engine.

[0045] The data collected by the high-pressure pressure sensor 9 - electrical signals are sent to the cab instrument for the driver to see; the high-pressure pressure gauge 3 is arranged on the panel assembly, located at the lower part of the outer side of the vehicle, so that it is easy to see when operating the corresponding valve. The pipeline gas pressure signal collected by the high-pressure pressure gauge 3 is independent of the cylinder pressure signal collected by the high-pressure pressure sensor 9, but the cylinder and the pipeline are connected, and the pressure values ​​of the two are the same, both reflecting the gas storage pressure of the entire gas supply system. Pressure monitoring through two paths is also convenient for drivers and passengers to check the pressure when they are in different positions.

[0046] In this embodiment, a high-pressure coarse filter 111 is further provided between the high-pressure precision filter 11 and the high-pressure stop valve 10 to improve the filtering effect. When actually arranged on a truck, the distance between the high-pressure stop valve 10 and the high-pressure coarse filter 111 is 300-500mm. According to the actual vehicle layout, the pipeline path adopts a U-shaped manner, and a maximum of 2 bends are set. The bending shape of the pipeline is appropriate to minimize the air resistance as much as possible to avoid obstruction of gas flow or damage to the pipeline due to too small bends; the distance between the high-pressure precision filter 11 and the high-pressure coarse filter 111 is 100-200mm; the distance between the high-pressure precision filter 11 and the high-pressure solenoid valve 12 is 500-1000mm. Since it spans two compartments, a straight pipeline is adopted, and an anti-seismic bend is set in the middle to ensure that the pipeline will not loosen or fall off during vibration; the distance between the high-pressure solenoid valve 12 and the high-pressure reducer 13 is 200-300mm. Such a layout can achieve an efficient and compact layout of the pipeline, while ensuring the reliability of the connection.

[0047] A group of gas probes 16 are respectively arranged on the top surface of the gas cylinder compartment and the bottom of the bottle group; a group of gas probes 16 are respectively arranged at the panel assembly and the high-pressure precision filter 11 in the gas filling compartment; a group of gas probes 16 and temperature probes 17 are arranged on the top surface of the engine compartment; and a leakage alarm is arranged in the cab.

[0048] In this embodiment, the cylinder group adopts two groups of high-pressure gas cylinders 7 with the same capacity connected in parallel, and a number of high-pressure gas cylinders 7 in each group are connected in series, and the overall matrix arrangement is arranged, and the connecting pipes between the gas cylinders have a seismic bend design, such as Figure 1 The two columns shown.

[0049] The present embodiment provides a layout method for a 35MPa compressed natural gas gas supply system for a vehicle, which adopts a cabin layout independent of the front of the vehicle and the compartment, thereby improving the flexibility and reliability of the layout of the entire system in the vehicle, especially for trucks carrying important goods, the gas supply system can be effectively isolated from the goods, thereby improving transportation safety; coupled with the favorable position settings of various panels and valves, the driver and passengers can conveniently operate the valves in different situations, thereby ensuring the safe operation of the system and timely handling of faults, thereby further improving the safety of the system; the pipeline design of the entire gas supply system comprehensively considers the road conditions and environmental factors of the vehicle, thereby ensuring the safe, reliable and efficient operation of the system, and by adopting steel pipe connections, appropriate elbows and transition sections, shock absorption, temperature and corrosion resistance, high-efficiency filtration and other measures, the smoothness and stability of the gas flow are ensured, which can effectively cope with the challenges of various road conditions and environments, improve the performance and service life of the gas supply system, and especially ensure the reliable operation of vehicles, especially heavy trucks, during long-distance driving on complex roads, across provinces, and with large differences in environmental changes.

[0050] Embodiment 3

[0051] Different from the first and second embodiments, Figure 3 and Figure 4 As shown, the cylinder group uses two groups of high-pressure gas cylinders 7 with different capacities connected in parallel, and the two groups of high-pressure gas cylinders 7 are arranged up and down and the arrangement extension direction is vertical; a number of high-pressure gas cylinders 7 in one group are connected in series, 4*150L gas cylinders; a number of high-pressure gas cylinders 7 in another group are divided into two groups and connected in parallel at intervals, two groups of 2*90L. The number and layout of different gas cylinders in this embodiment are determined according to the actual vehicle model, mainly to maximize the use of the available space of different vehicle models, so as to obtain the largest gas cylinder volume, so that the vehicle can obtain the maximum driving range of a single gas filling.

[0052] The above is only an embodiment of the present invention. The common sense such as the known specific structure and characteristics in the scheme is not described in detail here. The ordinary technicians in the relevant field are aware of all the common technical knowledge in the technical field of the invention before the application date or priority date, can obtain all the existing technologies in the field, and have the ability to apply the conventional experimental means before that date. The ordinary technicians in the relevant field can improve and implement the scheme in combination with their own abilities under the enlightenment given by this application. Some typical known structures or known methods should not become obstacles for the ordinary technicians in the relevant field to implement this application. It should be pointed out that for the technicians in this field, without departing from the structure of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. A 35MPa compressed natural gas supply system for vehicles, characterized in that: Including gas cylinder compartment, gas filling compartment and engine compartment; A number of high-pressure gas cylinders are installed in the gas cylinder cabin; each of the high-pressure gas cylinders is a carbon fiber fully wrapped gas cylinder with a rated working pressure of 35MPa, and is equipped with a cylinder valve, which integrates a flow sensor, a temperature sensor and a pressure sensor, and is used to automatically cut off the gas supply and safely release the pressure under abnormal conditions; the high-pressure gas cylinders are connected to form a cylinder group according to the corresponding capacity and arrangement determined by the preset strategy, and a high-pressure pressure sensor is provided at the connection end of the cylinder group to collect the gas storage pressure of the entire cylinder group; The gas filling cabin is equipped with a pipeline for filling the high-pressure gas storage cylinder with high-pressure natural gas and a first pipeline for supplying gas to the engine; the pipeline for filling the high-pressure gas storage cylinder with high-pressure natural gas includes a gas filling port and a one-way valve connected in sequence; the first pipeline for supplying gas to the engine includes a high-pressure shut-off valve and a high-pressure precision filter connected in sequence, and also includes a pipeline overcurrent protection valve with electromagnetic automatic reset and automatically cutting off the gas supply under abnormal circumstances; the one-way valve and the high-pressure shut-off valve are jointly connected to one end of the pipeline overcurrent protection valve, and the other end of the pipeline overcurrent protection valve is connected to the bottle group; the pipeline where the one-way valve is connected to the pipeline overcurrent protection valve is connected to a high-pressure pressure gauge for displaying the pipeline gas storage pressure; wherein the gas filling port, the one-way valve, the high-pressure pressure gauge and the high-pressure shut-off valve are integrated on a panel assembly; A second pipeline for supplying air to the engine is installed in the engine compartment; the second pipeline for supplying air to the engine includes a high-pressure solenoid valve and a high-pressure pressure reducer connected to one end of the high-pressure solenoid valve, and is connected to the engine through the high-pressure pressure reducer; the other end of the high-pressure solenoid valve is connected to a high-pressure precision filter; Among them, several high-pressure gas cylinders in the gas cylinder compartment are connected by a first high-pressure steel pipe, and other pipelines are connected by a second high-pressure steel pipe; The gas cylinder cabin, the gas filling cabin and the engine cabin are all equipped with gas probes and / or temperature probes, and all the gas probes and temperature probes are connected to the leakage alarm.

2. A 35MPa compressed natural gas supply system for vehicles according to claim 1, characterized in that: The maximum working pressures of the first high-pressure steel pipe, the second high-pressure steel pipe, the bottle valve, the one-way valve, the high-pressure stop valve, the high-pressure precision filter, the high-pressure pressure reducer and the pipeline overcurrent protection valve are all 1.25 times the rated working pressure of 35 MPa.

3. A 35MPa compressed natural gas supply system for vehicles according to claim 1, characterized in that: The first high-pressure steel pipe and the second high-pressure steel pipe are respectively made of high-pressure resistant 3 / 8 inch and 1 / 2 inch stainless steel pipes.

4. A 35MPa compressed natural gas supply system for vehicles according to claim 1, characterized in that: The filtering accuracy of the high-pressure precision filter is greater than 0.3μ, and the filtering efficiency is greater than 99.99%.

5. A 35MPa compressed natural gas supply system for vehicles according to claim 1, characterized in that: The pipeline high-pressure solenoid valve is powered by 24V.

6. A layout method for a 35MPa compressed natural gas supply system for a vehicle, characterized in that: Installing a vehicle-use 35MPa compressed natural gas supply system as described in any one of claims 1 to 5 on a vehicle; The gas cylinder compartment and the gas filling compartment are independent. The gas cylinder compartment is installed behind and close to the front of the vehicle, the gas filling compartment is installed at the lower part of either side of the gas cylinder compartment along the width direction of the vehicle, and the panel assembly is installed in the gas filling compartment; the engine compartment is installed under the front of the vehicle, and a built-in space for the vehicle engine is reserved for integration with the vehicle engine.

7. The layout method of a 35MPa compressed natural gas supply system for a vehicle according to claim 6, characterized in that: The cylinder group uses two groups of high-pressure gas cylinders with the same capacity connected in parallel, and several high-pressure gas cylinders in each group are connected in series, and the overall arrangement is in a matrix.

8. The layout method of a 35MPa compressed natural gas supply system for a vehicle according to claim 6, characterized in that: The bottle group adopts two groups of high-pressure gas cylinders with different capacities connected in parallel. The two groups of high-pressure gas cylinders are arranged up and down and the arrangement extension direction is vertical; several high-pressure gas cylinders in one group are connected in series, and several high-pressure gas cylinders in the other group are divided into two groups and connected in parallel at intervals.

9. The layout method of a 35MPa compressed natural gas supply system for a vehicle according to claim 6, characterized in that: A group of gas probes are arranged on the top surface of the gas cylinder compartment and the bottom of the bottle group; a group of gas probes are arranged at the panel assembly and the high-pressure precision filter in the gas filling compartment; a group of gas probes and temperature probes are arranged on the top surface of the engine compartment; and a leakage alarm is arranged in the cab.

10. The layout method of a 35MPa compressed natural gas supply system for a vehicle according to claim 6, characterized in that: A high-pressure coarse filter is also arranged between the high-pressure precision filter and the high-pressure stop valve; the distance between the high-pressure stop valve and the high-pressure coarse filter is 300-500mm, the pipeline path adopts a U-shape, and a maximum of 2 bends are set; the distance between the high-pressure precision filter and the high-pressure coarse filter is 100-200mm, and the distance between the high-pressure precision filter and the high-pressure solenoid valve is 500-1000mm, both of which adopt straight-through pipelines with an anti-seismic bend in the middle; the distance between the high-pressure solenoid valve and the high-pressure pressure reducer is 200-300mm.

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