CN212318180U

CN212318180U - Novel on-vehicle gas cylinder assembly of LNG

Info

Publication number: CN212318180U
Application number: CN202021105809.8U
Authority: CN
Inventors: 张建明; 姬广存
Original assignee: Yingjia Power Technology Wuxi Co ltd
Current assignee: Yingjia Power Technology Wuxi Co ltd
Priority date: 2020-06-15
Filing date: 2020-06-15
Publication date: 2021-01-08
Anticipated expiration: 2030-06-15

Abstract

The utility model discloses a novel LNG vehicle-mounted gas cylinder assembly, gas cylinder inner bag in the vehicle-mounted gas cylinder, the intercommunication is provided with check valve and first cut-off valve on the gas cylinder inner bag respectively, the prefill valve is connected to the check valve other end, discharge valve is connected to the first cut-off valve other end, the inside cryopump that is provided with of gas cylinder inner bag, the cryopump passes through the drive of cryopump actuating system, the exit end intercommunication of cryopump has the third to cut-off the valve, the other end intercommunication buffer memory jar of third cut-off valve, the other end and the DFDI pressure modulation of buffer memory jar are connected with injection system, the utility model discloses a mode that LNG pumps improves the pump-out pressure and the stability of LNG, is favorable to improving the duration of vehicle.

Description

Novel on-vehicle gas cylinder assembly of LNG

Technical Field

The utility model relates to an engine accessories technical field, in particular to novel on-vehicle gas cylinder assembly of LNG.

Background

The natural gas is carried on a vehicle in two ways, namely Compressed Natural Gas (CNG) and Liquefied Natural Gas (LNG), and CNG is high-pressure gaseous natural gas, and usually 1 volume of CNG is converted into 200 standard volumes of natural gas. LNG is natural gas in liquid form, typically 1 volume converted to 625 standard volumes of natural gas.

In an LNG vehicle, liquefied natural gas in an LNG vehicle-mounted gas cylinder flows out of the gas cylinder under the action of gravity of the LNG vehicle, is vaporized by a vaporizer and then is introduced into an internal combustion engine to perform combustion work. After the liquefied natural gas in the vehicle-mounted gas cylinder is used to a certain degree, the residual liquefied natural gas about 25% cannot flow out of the gas cylinder smoothly through the gravity of the liquefied natural gas cylinder, and the liquefied natural gas can be continuously used only after sufficient liquefied natural gas is supplemented in time, so that the continuous running capacity of the vehicle is influenced, the waste of a storage space is also caused, and extra burden is added to the vehicle.

In a dual fuel injection in-cylinder direct injection (DFDI) technique, about 5% diesel oil is injected into a combustion chamber, and 95% CNG is injected into the combustion chamber, so that the diesel oil is compression-ignited in the combustion chamber, and then the subsequently injected CNG is ignited to perform main combustion, thereby driving the engine to perform combustion work. The DFDI technology has higher thermal efficiency than a diesel engine, which can reach 42% -48%, and can greatly reduce the emission of pollutants such as PM value, NOx and the like, thus being a cleaner and more economic internal combustion engine fuel injection system.

When the engine adopts DFDI technology, the on-board gas cylinder is required to provide high-pressure and stable CNG for the system. On-vehicle gas cylinder on the existing market, LNG flows out through the dead weight, then vaporizes, and CNG pressure after the vaporization is low, and is unstable moreover, can't be regularly, the quantitative high-pressure natural gas that provides for the DFDI engine, needs a novel on-vehicle gas cylinder assembly of LNG of development urgently, is applied to the internal direct injection engine of dual-fuel high-pressure cylinder.

SUMMERY OF THE UTILITY MODEL

The utility model provides a novel on-vehicle gas cylinder assembly of LNG, this gas cylinder assembly all pumps out with the LNG in the gas cylinder, for DFDI technical engine provides the CNG of stable, high pressure, increases the continuation of the journey mileage of vehicle.

In order to solve the technical problem, the utility model discloses a technical scheme does:

the utility model provides a novel on-vehicle gas cylinder assembly of LNG, includes the gas cylinder inner bag in the on-vehicle gas cylinder, it is provided with check valve and first stop valve to communicate respectively on the gas cylinder inner bag, the prefill valve is connected to the check valve other end, the direction that switches on of check valve is by prefill valve to gas cylinder inner bag, discharge valve is connected to the first stop valve other end, the inside cryopump that is provided with of gas cylinder inner bag, each position on the gas cylinder inner bag can be arranged to the cryopump, the cryopump passes through the drive of cryopump actuating system, the exit end intercommunication of cryopump has the third stop valve, the other end intercommunication buffer memory jar of third stop valve, the other end and the DFDI pressure modulation of buffer memory jar are connected with injection system, provide high pressure, stable CNG for the DFDI engine.

The low-temperature pump driving system adopts various driving modes such as hydraulic driving, motor driving, mechanical mechanism driving and the like.

Preferably, a vaporizer structure in the cryopump is communicated with an engine water circulation system, and a water flow valve is arranged in the engine water circulation system.

Preferably, the cryopump driving system comprises a high-pressure oil supply system, a reversing valve is arranged between the high-pressure oil supply system and the cryopump, the reversing valve is respectively connected with the high-pressure oil supply system, the cryopump, a pressure reducing valve and an oil tank through four interfaces, and the pressure reducing valve is respectively connected with the cryopump and the oil tank through the other two interfaces.

Preferably, a booster valve is further installed between the vaporized CNG channel in the cryogenic pump and the inner container of the gas cylinder, and the booster valve is in a normally closed state.

Preferably, an overflow valve is arranged between the third stop valve and the buffer tank.

Preferably, a primary safety valve is arranged between the gas cylinder liner and the first stop valve, and one end of the primary safety valve is connected with a pressure gauge.

Preferably, a second stop valve is arranged on the gas cylinder liner, and the other end of the second stop valve is connected with the liquid outlet.

Preferably, a liquid level meter is arranged on the inner container of the gas cylinder, and the other end of the liquid level meter is connected with a liquid level transmitter.

Preferably, a second-stage safety valve is connected with the cryogenic pump and arranged on the inner container of the gas cylinder, and the opening pressure value of the second-stage safety valve is greater than that of the first-stage safety valve.

By adopting the technical scheme, the cryogenic pump driving system drives the cryogenic pump to pump the LNG in the gas cylinder liner out and supply the LNG to the DFDI pressure regulating and injection system, and the pressure of the pumped and vaporized CNG reaches 50-550 bar, so that stable and high-pressure CNG can be provided for a DFDI technical engine, and the problems that the LNG in an original vehicle-mounted gas cylinder flows out of the gas cylinder through self gravity, the LNG cannot flow out smoothly when the residual quantity of the LNG is small, the pressure of the vaporized CNG is low and unstable, and the endurance mileage of a vehicle is low are solved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, serve to provide a further understanding of the application and to enable other features, objects, and advantages of the application to be more apparent. The drawings and their description illustrate the embodiments of the invention and do not limit it. In the drawings:

FIG. 1 is a schematic diagram of the present invention;

FIG. 2 is a schematic diagram of the operation of an embodiment of the present invention;

fig. 3 is a schematic structural view of the cryopump of the present invention when placed left and right;

fig. 4 is a schematic structural view of the cryopump of the present invention when it is placed up and down;

fig. 5 is a schematic structural view of the cryopump of the present invention when it is in the middle.

In the figure, 01-cylinder liner, 02-liquid filling valve, 03-one-way valve, 04-first stop valve, 05-vent valve, 06-first-stage safety valve, 07-pressure gauge, 08-liquid discharge port, 09-second stop valve, 10-liquid level meter, 11-liquid level transducer, 12-cryogenic pump, 13-cryogenic pump driving system, 14-pressure increasing valve, 15-second-stage safety valve, 16-water flow valve, 17-water circulation system, 18-third stop valve, 19-overflow valve, 20-buffer tank, 21-DFDI pressure regulating and injecting system, 22-pressure reducing valve, 23-high-pressure oil supply system, 24-oil tank, 25, 26, 27, 28, 29, 30, 31-arrow.

Detailed Description

The following description of the present invention will be made with reference to the accompanying drawings 1-5. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features related to the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

The utility model provides a novel LNG vehicle-mounted gas cylinder assembly, including the gas cylinder inner bag 01 in the vehicle-mounted gas cylinder, the gas cylinder inner bag 01 is gone up to communicate respectively and is provided with check valve 03 and first stop valve 04, the prefill valve 02 is connected to the check valve 03 other end, the turn-on direction of check valve 03 is by prefill valve 02 to gas cylinder inner bag 01, exhaust valve 05 is connected to the first stop valve 04 other end, gas cylinder inner bag 01 is inside to be provided with cryogenic pump 12, cryogenic pump 12 can arrange each position on gas cylinder inner bag 01, and the common arrangement mode has the left and right arrangement of gas cylinder inner bag 01, arranges from top to bottom and middle to put, cryogenic pump 12 is driven through cryogenic pump actuating system 13, the exit end intercommunication of cryogenic pump 12 has third stop valve 18, the other end of third stop valve 18 communicates buffer tank 20, and cryogenic pump 12 pumps the CNG after the vaporization, along arrow 28 directions, through the third stop valve 18 and the excess flow valve 19 to the surge tank 20, the other end of the surge tank 20 being connected to the DFDI pressure regulation and injection system 21 to provide high pressure, stable CNG to the DFDI engine. Specifically, when the vehicle-mounted gas cylinder is filled with LNG, the first stop valve 04 is opened, the LNG is filled into the gas cylinder liner 01 through the filling device along the direction of an arrow 31 via the liquid filling valve 02 and the one-way valve 03, and compressed gas in the gas cylinder liner 01 flows out of the vehicle-mounted gas cylinder through the first stop valve 04 and the exhaust valve 05 along the direction of an arrow 30, so that the LNG fuel is filled. After LNG fills dress and accomplishes, check valve 03 and first stop valve 04 close, cut off the passageway of gas cylinder inner bag 01 and external environment, avoid LNG palirrhea.

The cryopump drive system 13 is driven by a hydraulic drive, a motor drive, a mechanical mechanism drive, and the like, which are common drive methods in the prior art, and therefore, the details are not described herein.

The vaporizer structure in the cryopump 12 is connected to an engine water circulation system 17, in which a water flow valve 16 is provided. Specifically, the high-temperature cooling liquid in the engine water circulation system 17 is led to a vaporizer structure in the low-temperature pump 12 to vaporize the LNG pumped out by the low-temperature pump 12 into CNG, so that waste heat is recycled, and the purposes of energy conservation, environmental protection and high efficiency are achieved; a water flow valve 16 is arranged in the water circulation system 17 to realize the control of the water flow rate.

As an embodiment of the present invention, the cryopump drive system 13 includes a high pressure oil supply system 23, be provided with the switching-over valve 24 between high pressure oil supply system 23 and the cryopump 12, high pressure oil supply system 23, cryopump 12, relief pressure valve 22 and oil tank 25 are connected respectively through four interfaces to the switching-over valve 24, cryopump 12 and oil tank 25 are connected respectively through two other interfaces on the relief pressure valve 22. Specifically, the high-pressure oil supply system 23 supplies high-pressure oil to the reversing valve 24, the reversing valve 24 drives the cryogenic pump 12 to reciprocate under the control of the vehicle control system, the pushing of the LNG is realized, the pressure reducing valve 22 is arranged in the hydraulic drive system, redundant high-pressure oil is sent back to the oil tank 25 along the arrow 26 direction, the operation of part of the motion stroke of the cryogenic pump 12 within a set pressure range is protected, and the use safety is improved.

A booster valve 14 is further installed between the vaporized CNG channel inside the cryogenic pump 12 and the gas cylinder liner 01, and the booster valve 14 is in a normally closed state. Specifically, when the pressure in the gas cylinder liner 01 is lower than a set value, the vehicle control system controls the pressurization valve 14 to open, and the gas cylinder liner 01 is pressurized along the direction of the arrow 27, so that the gas cylinder liner 01 is ensured to work within a set range.

An overflow valve 19 is arranged between the third stop valve 18 and the buffer tank 20. Specifically, when the abnormal condition CNG flow rate exceeds the set value of the excess flow valve 19, the excess flow valve 19 closes, actively shutting off the passage of the cryopump 12CNG outlet from the outside environment.

A primary safety valve 06 is arranged between the gas cylinder liner 01 and the first stop valve 04, and one end of the primary safety valve 06 is connected with a pressure gauge 07. Specifically, the pressure gauge 07 displays the pressure in the gas cylinder liner 01 in real time, and plays a monitoring role; when the pressure in the gas cylinder liner 01 exceeds a set value, the primary safety valve 06 is opened, and compressed gas in the gas cylinder liner 01 is discharged to the external environment through the primary safety valve 06, so that the pressure in the gas cylinder liner 01 is ensured to be within a set range, and the use safety of the gas cylinder liner 01 is improved.

And a second stop valve 09 is arranged on the gas cylinder liner 01, and the other end of the second stop valve 09 is connected with a liquid discharge port 08. Specifically, when the LNG in the vehicle-mounted gas cylinder needs to be discharged in a special situation, the second stop valve 09 and the first stop valve 04 are simultaneously opened, the LNG is drawn out through the second stop valve 09 and the liquid discharge port 08 in the direction of the arrow 29, compressed gas is introduced into the gas cylinder liner 01 through the exhaust valve 05, the LNG is smoothly discharged, and after the liquid discharge is completed, the first stop valve 04 and the second stop valve 09 are closed.

The gas cylinder inner container 01 is provided with a liquid level meter 10, and the other end of the liquid level meter 10 is connected with a liquid level transmitter 11. Specifically, the liquid level meter 10 reflects the liquid level of LNG in the gas cylinder liner 01 in real time, a liquid level signal is transmitted to a vehicle control system through the liquid level transmitter 11, and the integrated methane alarm in the liquid level transmitter 10 can guarantee the safety of a vehicle.

And a secondary safety valve 15 is arranged on the gas cylinder liner 01 and connected with the cryogenic pump 12, and the secondary safety valve 15 is larger than the opening pressure value of the primary safety valve 06. Specifically, when the pressure in the gas cylinder liner 01 exceeds a set value and the primary safety valve 06 fails, the secondary safety valve 15 is opened, and the compressed gas in the gas cylinder liner is discharged to the external environment through the primary safety valve 06, so that the pressure in the gas cylinder liner 01 is ensured to be within a set range, and the use safety of the gas cylinder liner 01 is improved.

To sum up, the utility model provides a LNG in original on-vehicle gas cylinder flow out from the gas cylinder through self gravity, when the LNG surplus is less, will not flow smoothly, the low and unstable of CNG pressure after the vaporization, the low problem of vehicle continuation of the journey mileage.

The embodiments of the present invention have been described in detail with reference to fig. 1 to 5, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in the embodiments without departing from the principles and spirit of the invention, and the scope of the invention is to be accorded the full scope of the claims.

Claims

1. The utility model provides a novel on-vehicle gas cylinder assembly of LNG, includes the gas cylinder inner bag in the on-vehicle gas cylinder, its characterized in that: the gas cylinder liner is respectively communicated with a check valve and a first stop valve, the other end of the check valve is connected with a liquid filling valve, the other end of the first stop valve is connected with an exhaust valve, a cryogenic pump is arranged in the gas cylinder liner and driven by a cryogenic pump driving system, the outlet end of the cryogenic pump is communicated with a third stop valve, the other end of the third stop valve is communicated with a cache tank, and the other end of the cache tank is connected with a DFDI pressure regulation and injection system.

2. The novel on-vehicle gas cylinder assembly of LNG of claim 1, characterized in that: the vaporizer structure in the cryogenic pump is communicated with an engine water circulation system, and a water flow valve is arranged in the engine water circulation system.

3. The novel on-vehicle gas cylinder assembly of LNG of claim 1, characterized in that: the cryogenic pump driving system comprises a high-pressure oil supply system, a reversing valve is arranged between the high-pressure oil supply system and the cryogenic pump, the reversing valve is respectively connected with the high-pressure oil supply system, the cryogenic pump, a pressure reducing valve and an oil tank through four interfaces, and the pressure reducing valve is respectively connected with the cryogenic pump and the oil tank through the other two interfaces.

4. The novel on-vehicle gas cylinder assembly of LNG of claim 1, characterized in that: and a booster valve is also arranged between the cryogenic pump and the gas cylinder liner, and the booster valve is in a normally closed state.

5. The novel on-vehicle gas cylinder assembly of LNG of claim 1, characterized in that: and an overflow valve is arranged between the third stop valve and the buffer tank.

6. The novel on-vehicle gas cylinder assembly of LNG of claim 1, characterized in that: a primary safety valve is arranged between the gas cylinder liner and the first stop valve, and one end of the primary safety valve is connected with a pressure gauge.

7. The novel on-vehicle gas cylinder assembly of LNG of claim 1, characterized in that: and a second stop valve is arranged on the gas cylinder liner, and the other end of the second stop valve is connected with a liquid outlet.

8. The novel on-vehicle gas cylinder assembly of LNG of claim 1, characterized in that: and a liquid level meter is arranged on the gas cylinder liner, and the other end of the liquid level meter is connected with a liquid level transmitter.

9. The novel on-vehicle gas cylinder assembly of LNG of claim 7, characterized in that: and a secondary safety valve is connected with the cryogenic pump and arranged on the gas cylinder liner, and the opening pressure value of the secondary safety valve is greater than that of the primary safety valve.