CN216345383U - Pressure-regulating gas supply system of natural gas cylinder - Google Patents

Abstract

The utility model discloses a pressure-regulating gas supply system of a natural gas cylinder, which comprises: the inner end of the pressure boosting vaporization pipe in the vaporizer is communicated with the outlet of a pressure boosting pump, the outlet of the pressure boosting vaporization pipe in the vaporizer is communicated with the inlet of a pressure boosting air return pipe, the outlet of the pressure boosting air return pipe is connected to the emptying pipe at the outer end of the emptying stop valve, and a pipeline safety valve is arranged on the emptying pipe at the outer end of the joint of the pressure boosting air return pipe and the emptying pipe; the pressure-increasing vaporization pipe is communicated with the engine connecting pipe through a tax pressure-regulating connecting pipe with a pressure-regulating stop valve, and a pressure detection device for detecting the pressure in the natural gas cylinder is arranged. The system can stably and efficiently regulate the pressure.

Description

Pressure-regulating gas supply system of natural gas cylinder

Technical Field

The utility model relates to the technical field of natural gas cylinder gas supply, in particular to a gas supply system for supplying liquefied natural gas in a natural gas cylinder to a gas engine after being vaporized.

Background

At present, the diesel vehicle adopts the emission standard of the national six, and the emission requirement of the standard is higher, so that the natural gas vehicle is promoted to be generally adopted in the transportation industry to transport goods. The method for supplying gas in a natural gas automobile is as follows: the liquefied natural gas in the natural gas cylinder is vaporized by a gas supply system and then supplied to a gas engine for use. The existing natural gas cylinder generally adopts a double-layer structure of an outer cylinder and an inner cylinder, a vacuum interlayer is formed between the inner cylinder and the outer cylinder, and the outer cylinder comprises: outer barrel and connect outer preceding head and outer back head on outer barrel, the inner tube includes: the inner cylinder body, and an inner front end enclosure and an inner rear end enclosure which are connected on the inner cylinder body. The inner cylinder of the natural gas cylinder filled with liquefied natural gas comprises a liquid phase space and a gas phase space, and the gas phase space is positioned above the liquid phase space. The central through hole of the outer front end socket is fixedly provided with a distribution head, the inner ends of the liquid inlet pipeline, the liquid outlet pipeline and the emptying pipeline respectively extend into the liquid phase space and the gas phase space of the inner cylinder through a plurality of connecting channels arranged in the distribution head, the liquid outlet pipeline is provided with a vaporizer, and the outer end of the liquid outlet pipeline can be communicated with a gas engine. The vaporizer heats and vaporizes the liquefied natural gas entering a vaporization pipe of the vaporizer by using circulating cooling water of the engine. Because the natural gas output by the natural gas cylinder needs to meet the pressure range requirement of the use of the gas engine, a pressurizing pipeline is arranged in the natural gas cylinder gas supply system, and a pressurizing vaporizer is arranged in the pressurizing pipeline. The booster circuit includes: the inlet end is communicated with the liquid phase space, the outlet end is communicated with a pressurizing liquid inlet pipe of the pressurizing vaporizer, the inlet end is communicated with the pressurizing vaporizer, and the outlet end is communicated with a pressurizing gas return pipe of the gas phase space. When pressurization is needed, liquefied natural gas in the liquid phase space enters the pressurization vaporizer to be vaporized through the pressurization liquid inlet pipe, and the vaporized natural gas enters the gas phase space through the pressurization gas return pipe, so that the pressure in the inner cylinder of the natural gas cylinder is increased. The natural gas cylinder is characterized in that a pressure adjusting pipeline is further arranged in a gas supply system of the natural gas cylinder, an economic valve is arranged on the pressure adjusting pipeline, the inlet end of the pressure adjusting pipeline is communicated with a gas phase space, and the outlet end of the pressure adjusting pipeline is communicated with a liquid outlet pipeline.

When the gas supply system of the natural gas cylinder comprising the pressurization pipeline, the liquid outlet pipeline and the pressure regulating pipeline is used, the following defects are realized: firstly, because the entrance point of pressure boost feed liquor pipe also stretches into in the liquid phase space of inner tube through the connecting channel on the distribution head that sets up in head central through hole, when the liquefied natural gas liquid level in the natural gas cylinder inner tube reduced to less than 30% of nominal standard liquid level, liquefied natural gas in the inner tube can't export liquefied natural gas in the mode of natural liquid level difference to pressure boost feed liquor pipe this moment, just so can not be through the pressure boost pipeline to the gaseous phase space pressure boost, will lead to not meeting the requirements through the pressure of the natural gas of drain pipe supply gas engine. Secondly, the booster vaporizer arranged in the booster pipeline is usually a finned vaporizer, liquefied natural gas passing through the finned booster vaporizer is vaporized after being heated by air bath, and the booster efficiency is low. And the inlet end of the pressurized liquid inlet pipe extends into the liquid phase space of the inner cylinder through a connecting channel on the distribution head arranged in the central through hole of the seal head, and external heat can be transferred into the liquid phase space in the inner cylinder through the pressurized liquid inlet pipe, so that the heat insulation performance of the natural gas cylinder can be reduced. Fourthly, because be provided with vaporizer and pressure boost vaporizer among the gas supply system for the gas supply system dead weight is great, and the pipeline structure among the gas supply system is complicated, and the valve that need open and close during the use is more, and the operation is comparatively loaded down with trivial details. Fifthly, a pressurizing liquid inlet pipe in the inner cylinder close to the distribution head can be provided with a bending part in a U shape or a V shape, so that a gas phase space with a gas seal effect is formed to improve the heat insulation performance of the natural gas cylinder, but the liquefied natural gas in the bending part can generate gas resistance after being heated and vaporized, and manual exhaust is needed before the pressurizing pipeline is used.

SUMMERY OF THE UTILITY MODEL

The purpose of the utility model is: the pressure regulating gas supply system of the natural gas cylinder is simpler in operation and can stably and efficiently regulate pressure, so that the pressure requirement for using a gas engine after liquefied natural gas in the natural gas cylinder is vaporized is met, and the heat insulation performance of the natural gas cylinder can be improved.

In order to achieve the purpose, the utility model adopts the technical scheme that: pressure regulating gas supply system of natural gas cylinder includes: the inner end of the emptying pipe extends into a gas phase space of the natural gas bottle, the emptying pipe is provided with an emptying stop valve, the inner end of the emptying pipe extends into a liquid outlet pipe in a liquid phase space of the natural gas bottle, the liquid outlet pipe is provided with a liquid outlet stop valve and is communicated with an engine connecting pipe through a vaporizing pipe in a vaporizer, the engine connecting pipe can be communicated with a gas engine, the inlet end of a pressurizing liquid inlet pipe is connected to the liquid outlet pipe between the liquid outlet stop valve and the vaporizer, the inlet of a pressurizing pump is communicated with the outlet end of the pressurizing liquid inlet pipe, the vaporizer is also provided with a pressurizing vaporizing pipe, the outlet of the pressurizing pump is communicated with the inlet end of the pressurizing vaporizing pipe, the outlet end of the pressurizing vaporizing pipe is communicated with the inlet end of a pressurizing air return pipe, the outlet end of the pressurizing air return pipe is connected to the emptying pipe at the outer end of the emptying stop valve, and the emptying pipe at the joint of the pressurizing air return pipe and the emptying pipe is provided with a pipeline safety valve; the pressure-increasing vaporization pipe is communicated with the engine connecting pipe through a pressure-regulating connecting pipe, and a pressure-regulating stop valve is arranged on the pressure-regulating connecting pipe; and a pressure detection device capable of detecting the pressure in the gas phase space of the natural gas cylinder is also arranged.

Further, the aforesaid pressure regulating gas supply system of natural gas cylinder, wherein: the booster pump include: the pump body is sealed at the periphery, a working cavity is arranged in the pump body, a suction inlet communicated with the working cavity is arranged in the middle of the side wall of the pump body, a first discharge port and a second discharge port communicated with the working cavity are respectively arranged on the pump body at two sides of the suction inlet, and check valves are respectively arranged on the suction inlet, the first discharge port and the second discharge port; a first electromagnetic module is fixed on the outer surface of the end wall of the pump body on the same side with the first discharge port, a second electromagnetic module is fixed on the outer surface of the end wall of the pump body on the same side with the second discharge port, the first electromagnetic module and the second electromagnetic module are oppositely arranged, a heat insulation layer is arranged between the shell of each electromagnetic module and the pump body, and a device capable of generating an electromagnetic field is arranged in each electromagnetic module; a piston arranged in the working cavity divides the working cavity into a first movable working cavity and a second movable working cavity which are isolated from each other, and an armature is fixed on the piston; the electromagnetic force generated when the first electromagnetic module works can pull the armature to drive the piston to move towards the first electromagnetic module, the electromagnetic force generated when the second electromagnetic module works can pull the armature to drive the piston to move towards the second electromagnetic module, so that the piston can reciprocate in a working section cavity between the first discharge port and the second discharge port, the first discharge port is always communicated with the first movable working cavity, the second discharge port is always communicated with the second movable working cavity, and the piston can repeatedly pass through the suction port in the reciprocating movement process in the working cavity, so that the suction port can be communicated with the first movable working cavity and the second movable working cavity; the suction inlet is communicated with the outlet end of the pressurizing liquid inlet pipe, and the first discharge port is communicated with the inlet end of the pressurizing vaporization pipe after being connected with the second discharge port in parallel.

Further, the aforesaid pressure regulating gas supply system of natural gas cylinder, wherein: the pressure detection device is a pressure sensor, the vaporizer is also provided with a temperature sensor which can detect the temperature of cooling water in the vaporizer, and the pressure regulating stop valve is an electromagnetic valve; the booster pump, the pressure regulating stop valve, the pressure sensor and the temperature sensor are all connected with the controller through electric signals.

Further, the aforesaid pressure regulating gas supply system of natural gas cylinder, wherein: the pressurizing vaporization pipe is U-shaped, the inlet end of the U-shaped pressurizing vaporization pipe is communicated with the outlet of the booster pump, the outlet end of the U-shaped pressurizing vaporization pipe is communicated with the inlet end of the pressurizing air return pipe, and the inlet end of the pressure regulating connecting pipe is connected to the bottom of the U-shaped pressurizing vaporization pipe.

Further, the aforesaid pressure regulating gas supply system of natural gas cylinder, wherein: the liquid outlet pipe between the liquid outlet stop valve and the pressurizing liquid inlet pipe is provided with a one-way overflow valve which can control the flow rate of the liquefied natural gas in the liquid outlet pipe and prevent the liquefied natural gas in the liquid outlet pipe from flowing into the natural gas cylinder.

Further, the aforesaid pressure regulating gas supply system of natural gas cylinder, wherein: the armature and the piston are perpendicular to each other, and two ends of the armature respectively extend into the first movable working cavity and the second movable working cavity.

Further, the aforesaid pressure regulating gas supply system of natural gas cylinder, wherein: the device which is arranged in each electromagnetic module and can generate an electromagnetic field is an iron core and a conductive winding wound on the iron core; the armature is provided with circumferential bulges at two ends, and the iron core is a horseshoe-shaped iron core.

Further, the aforesaid pressure regulating gas supply system of natural gas cylinder, wherein: and buffer springs for reducing impact force between the armature and the inner wall of the working cavity are arranged in the first movable working cavity and the second movable working cavity.

Further, the aforesaid pressure regulating gas supply system of natural gas cylinder, wherein: the check valves arranged on the suction inlet, the first discharge port and the second discharge port are all ball check valves.

Further, the aforesaid pressure regulating gas supply system of natural gas cylinder, wherein: an emptying safety valve is arranged on an emptying pipe at the inner end of the emptying stop valve.

The utility model has the advantages that: the utility model has the advantages that: firstly, the method comprises the following steps: a booster pump is adopted in the pressure-regulating gas supply system of the natural gas cylinder to suck the liquefied natural gas and output the liquefied natural gas into the vaporizer for vaporization, so that when the liquid level of the liquefied natural gas in the natural gas cylinder is reduced to be less than 30% of a rated standard liquid level, the pressure-regulating gas supply system of the natural gas cylinder can still stably and efficiently pressurize. In the pressure-regulating gas supply system of the natural gas cylinder, the inlet end of a pressurizing liquid inlet pipe is connected to a liquid outlet pipe between a liquid outlet stop valve and a vaporizer and does not extend into the natural gas cylinder through a corresponding connecting channel on a distribution head, so that the heat insulation performance of the natural gas cylinder is improved; compared with the common gas cylinder supply system, the natural gas cylinder pressure-regulating gas supply system with the structure reduces the number of the over-current protection valves, the pressurization stop valves and the like arranged on the pressurization vaporizer and the pressurization pipeline, so that the natural gas cylinder pressure-regulating gas supply system is lighter in self weight and is simpler and more convenient to operate. Thirdly, the utility model has the further advantages that: the booster pump draws the piston to reciprocate in the working cavity of the pump body through electromagnetic force to suck and discharge medium, the piston and each electromagnetic module driving the piston to move do not need to be connected, the shell of each electromagnetic module is made of heat insulating material, so that the cold energy in the pump body can not be directly transmitted to the iron core and the conductive winding in the shell, each electromagnetic module can normally work in the low-temperature environment of 196 ℃ below zero, the pressure-regulating gas supply system of the natural gas bottle provided with the booster pump can work safely and stably, the pressure requirement of the gas engine after the liquefied natural gas in the natural gas bottle is vaporized can be met, and the booster pump driven by the electromagnetic force is small in size, simple in structure, low in energy consumption and light in self weight.

Drawings

FIG. 1 is a schematic structural diagram of a pressure regulating gas supply system of a natural gas cylinder according to the present invention;

fig. 2 is a schematic view of the structure of the booster pump.

Detailed Description

The utility model is described in further detail below with reference to the figures and preferred embodiments.

As shown in fig. 1, the pressure-regulating gas supply system of a natural gas cylinder includes: the inner end of the emptying pipe 2 extends into a gas phase space of a natural gas bottle 9, an emptying stop valve 21 is arranged on the emptying pipe 2, the inner end of the emptying pipe extends into a liquid outlet pipe 1 in a liquid phase space of the natural gas bottle 9, a liquid outlet stop valve 11 is arranged on the liquid outlet pipe 1, the liquid outlet pipe 1 is communicated with an engine connecting pipe 13 through a vaporizing pipe 32 in a vaporizer 3, the engine connecting pipe 13 can be communicated with a gas engine, the inlet end of a pressurizing liquid inlet pipe 4 is connected to the liquid outlet pipe 1 between the liquid outlet stop valve 11 and the vaporizer 3, the inlet of a pressurizing pump 5 is communicated with the outlet end of the pressurizing liquid inlet pipe 4, a pressurizing vaporizing pipe 41 is also arranged in the vaporizer 3, the outlet of the pressurizing pump 5 is communicated with the inlet end of the pressurizing vaporizing pipe 41, the outlet end of the pressurizing vaporizing pipe 41 is communicated with the inlet end of a pressurizing air return pipe 42, the outlet end of the pressurizing air return pipe 42 is connected to the emptying pipe 2 at the outer end of the emptying stop valve 21, and a safety valve 22 is arranged on the emptying pipe 2 at the outer end where the pressurizing air return pipe is connected with the emptying pipe; the pressure-increasing vaporization pipe 41 is communicated with the engine connecting pipe 13 through the pressure-regulating connecting pipe 6, and the pressure-regulating connecting pipe 6 is provided with a pressure-regulating stop valve 61; a pressure detection device capable of detecting the pressure in the gas phase space of the natural gas cylinder 9 is also arranged.

As shown in fig. 2, the booster pump 5 includes: the pump body 51 is enclosed at the periphery, a working cavity 52 is arranged in the pump body 51, in actual manufacturing, the pump body 51 can be in a cylindrical shape, a suction inlet 53 communicated with the working cavity 52 is arranged in the middle of the side wall of the pump body 51, a first discharge port 54 and a second discharge port 55 communicated with the working cavity 52 are respectively arranged on the side wall of the pump body 51 at two sides of the suction inlet 53, the first discharge port 54 and the second discharge port 55 are respectively close to two ends of the cylindrical pump body, and one-way valves are respectively arranged on the suction inlet 53, the first discharge port 54 and the second discharge port 55; for convenience of description, the check valve provided at the suction port 53 is referred to as a suction check valve 531, the check valve provided at the first discharge port 54 is referred to as a first discharge check valve 541, and the check valve provided at the second discharge port 55 is referred to as a second discharge check valve 551; a first electromagnetic module 56 is fixed on the outer surface of the end side wall of the pump body 51 on the same side as the first discharge port 54, a second electromagnetic module 57 is fixed on the outer surface of the end side wall of the pump body 51 on the same side as the second discharge port 55, the first electromagnetic module 56 and the second electromagnetic module 57 are arranged oppositely, and both the first electromagnetic module 56 and the second electromagnetic module 57 include: the iron core 58 and the conductive winding 59 wound on the iron core 58, and the conductive winding 59 in the first electromagnetic module 56 and the second electromagnetic module 57 are electrified to generate an electromagnetic field. Since the pump body 51 is in a low-temperature environment during operation and cooling energy is radiated into the first and second electromagnetic modules 56 and 57, the housing of each electromagnetic module is preferably made of a heat insulating material, thereby preventing the radiated cooling energy from affecting the normal operation of the iron core 58 and the conductive winding 59 enclosed in the housing. A piston 521 arranged in the working chamber 52 divides the working chamber 52 into a first movable working chamber 522 and a second movable working chamber 523 which are isolated from each other, and an armature 524 is fixed on the piston 521; the electromagnetic force generated when the first electromagnetic module 56 works can pull the armature 524 to drive the piston 521 to move towards the first electromagnetic module 56, the electromagnetic force generated when the second electromagnetic module 57 works can pull the armature 524 to drive the piston 521 to move towards the second electromagnetic module 57, so that the piston 521 can reciprocate in the working section cavity between the first discharge port 54 and the second discharge port 55, the first discharge port 54 is always communicated with the first movable working cavity 522, the second discharge port 55 is always communicated with the second movable working cavity 523, the piston 521 can repeatedly pass through the suction port 53 in the process of repeatedly moving in the working cavity 52, and the suction port 53 can be communicated with the first movable working cavity 522 and the second movable working cavity 523. The suction port 53 of the booster pump 5 with the above structure is communicated with the outlet end of the booster liquid inlet pipe 4, and the first discharge port 54 is communicated with the inlet end of the booster vaporization pipe 41 after being connected with the second discharge port 55 in parallel.

In the present embodiment, the armature 524 and the piston 521 are disposed perpendicular to each other, and both ends of the armature 524 respectively extend into the first movable working chamber 522 and the second movable working chamber 523, so that the piston 521 and the armature 524 are easily and reliably fixed to each other. A buffer spring 525 that reduces the impact force between the armature 5 and the inner wall of the working chamber is provided in each of the first movable working chamber 522 and the second movable working chamber 523. The buffer spring 525 may be fixed to the inner wall of the working chamber 52 or may be sleeved on both ends of the armature 524.

In the present embodiment, the circumferential protrusions 526 are provided at both ends of the armature 524, so that the surface area of the end of the armature 524 is increased, and the iron cores 58 of the first electromagnetic module 56 and the second electromagnetic module 57 are both horseshoe-shaped iron cores. Therefore, the magnetic field generated in the first electromagnetic module 56 and the second electromagnetic module 57 is stronger, and the arrangement of the circumferential protruding portion 526 also increases the traction force when the armature 524 and the first electromagnetic module 56 or the second electromagnetic module 57 work in a matching manner, so that the piston 521 is more easily driven to reciprocate in the working section cavity.

In the present embodiment, the check valves provided in the suction port 53, the first discharge port 54, and the second discharge port 55 are all ball check valves. The ball check valve not only can seal and close the corresponding opening, but also is easy to open when the pressure on the two sides of the ball check valve changes.

Since the booster pump 5 of the above-described structure is provided in the gas supply system of the natural gas cylinder 9, the materials for manufacturing the respective components of the booster pump 5 need to be resistant to low temperatures. In the present embodiment, the pump body 51, the damper spring 525, and each check valve are made of austenitic stainless steel; the piston 521 is made of flexible graphite materials, so that the piston 521 can resist low temperature and has wear resistance; the armature 524 is fabricated from a magnetized stainless steel material.

When the booster pump 5 works, when the first electromagnetic module 56 is powered on and the second electromagnetic module 57 is powered off, the armature 524 is attracted to move towards the first electromagnetic module 56 by the electromagnetic force generated when the first electromagnetic module 56 works, so that the piston 521 is driven to move towards the first electromagnetic module 56, the volume of the first movable working chamber 522 is reduced, the volume of the second movable working chamber 523 is increased, the pressure in the first movable working chamber 522 is increased, the pressure in the second movable working chamber 523 is reduced, at this time, the first exhaust one-way valve 541 and the intake one-way valve 531 are both opened, the liquefied natural gas in the first movable working chamber 522 is exhausted through the first exhaust one-way valve 541 and then is vaporized, and the liquefied natural gas outside the booster pump enters the second movable working chamber 523 through the intake one-way valve 531; on the contrary, when the first electromagnetic module 56 is de-energized and the second electromagnetic module 57 is energized, the electromagnetic force generated when the second electromagnetic module 57 works attracts the armature 524 to move toward the second electromagnetic module 57, so as to drive the piston 521 to move toward the second electromagnetic module 57, so that the volume of the first movable working chamber 522 is increased, the volume of the second movable working chamber 523 is decreased, thus the pressure in the first movable working chamber 522 is decreased, the pressure in the second movable working chamber 523 is increased, at this time, both the second discharge check valve 551 and the suction check valve 531 are opened, the lng in the second movable working chamber 523 is discharged through the second discharge check valve 551 and then vaporized, and the lng outside the second movable working chamber 523 enters the first movable working chamber 522 through the suction check valve 531. This continues to cause the piston 521 to reciprocate in the working chamber between the first discharge port 54 and the second discharge port 55, discharging the lng and then vaporizing it. During operation of the booster pump 5, lng can be sucked and discharged as a mixed gas liquid by the booster pump 5.

Because the booster pump 5 is driven by electromagnetic force, the piston 521 does not need to be fixed on a driving shaft of a motor as a common booster pump, the piston 521 does not need to be connected with each electromagnetic module for driving the piston 521 to move, and the shell of each electromagnetic module is made of heat insulation materials, so that cold energy in the pump body 51 can not be directly transmitted to the iron core 58 and the conductive winding 59 in the electromagnetic module, and each electromagnetic module can normally work in a low-temperature environment of-196 ℃, so that a pressure regulating and gas supplying system of the natural gas cylinder provided with the booster pump 5 can work safely and stably, thereby ensuring that the liquefied natural gas in the natural gas cylinder reaches the pressure requirement of a gas engine after being vaporized, a dynamic seal does not need to be arranged between the piston 521 and a driving device for driving the piston 521 to move, and the booster pump 5 is not easy to leak when working. The booster pump 5 is simple in structure, the volume of a working cavity 52 of the booster pump 5 in a pressure-regulating gas supply system of a 1000L natural gas cylinder is only 50ml, when the pressure-regulating gas supply system of the natural gas cylinder provided with the booster pump 5 with the structure is equipped on a natural gas automobile, the booster pump can be driven to work by 24V voltage of the whole automobile, and the energy consumption of the booster pump 5 during working is low and is only between 30W and 70W. Therefore, the booster pump 5 can work at the low temperature of the natural gas cylinder pressure-regulating gas supply system, and the booster pump 5 has small volume and light dead weight and can work by using a vehicle-mounted power supply of a natural gas automobile as power.

In the embodiment, for the convenience of operation, the pressure detection device is a pressure sensor 7 which is arranged on the pressure regulating connecting pipe 6 between the pressure regulating stop valve 61 and the engine connecting pipe 13, so that the pressure change in the gas phase space of the natural gas cylinder 9 can be detected; the vaporizer 3 is also provided with a temperature sensor 31 for detecting the temperature of cooling water in the vaporizer 3, and the pressure-regulating stop valve 61 is an electromagnetic valve; the booster pump 5, the pressure regulating stop valve 61, the pressure sensor 7 and the temperature sensor 31 are all in electric signal connection with the controller 8.

In the present embodiment, the pressurizing vaporization pipe 41 has a "U" shape. The inlet end of the pressure regulating connecting pipe 6 is connected with the bottom of the U-shaped pressurizing vaporization pipe 41. The liquefied natural gas output after the booster pump 5 is operated has a long stroke in the booster vaporization pipe 41 of the U, so that the liquefied natural gas can be converted into a gas form after being sufficiently heated.

In the embodiment, a one-way flow-passing valve 12 capable of controlling the flow rate of the liquefied natural gas in the liquid outlet pipe 1 and preventing the liquefied natural gas in the liquid outlet pipe 1 from flowing into the natural gas cylinder 9 is arranged on the liquid outlet pipe 1 between the liquid outlet stop valve 11 and the pressurized liquid inlet pipe 4. In the original gas supply system of the natural gas cylinder, a liquid outlet one-way valve for preventing liquefied natural gas in a liquid outlet pipe from flowing into the natural gas cylinder is arranged on the liquid outlet pipe 1 positioned in the distribution head, and an overflow valve capable of controlling the flow rate of the liquefied natural gas in the liquid outlet pipe 1 is also arranged on the liquid outlet pipe 1 at the outer end of the liquid outlet stop valve 11. Therefore, in actual use, for maintenance convenience, the one-way overflow valve 12 is arranged on the liquid outlet pipe 1 between the liquid outlet stop valve 11 and the pressurized liquid inlet pipe 4.

In this embodiment, a vent relief valve 23 is provided on the vent pipe 2 at the inner end of the vent stop valve 21. When the pressure in the gas phase space of the natural gas bottle 9 exceeds a safety limit value, the vent safety valve 23 is opened to release the pressure. Moreover, when the pressure-regulating gas supply system of the natural gas cylinder is in a stop state, namely the booster pump 5 stops working and the emptying stop valve 21 is closed, residual liquefied natural gas exists in the liquid outlet pipe 1 and the pressurized liquid inlet pipe 4 of the pressure-regulating gas supply system, external heat is transferred to the residual liquefied natural gas through the pipeline, the pressure in the pipeline of the pressure-regulating gas supply system can be increased after the residual liquefied natural gas is heated and vaporized, so that the two sides of the suction inlet 53 of the booster pump 5 have pressure difference, so that the suction check valve 531 is opened, the gas in the liquid outlet pipe 1 enters the booster pump 5 from the suction inlet 53 of the booster pump, enters the pressurizing vaporization pipe 41 from the first outlet 54 or the second outlet 55, enters the emptying pipe 2 through the pressurizing return air pipe 42, when the pressure in the pipeline exceeds a safety set value, the pipeline safety valve 22 is opened to release the pressure, so that potential safety hazards caused by overpressure in a pressure-regulating gas supply system of the natural gas cylinder are prevented.

When the pressure-regulating gas supply system of the natural gas cylinder works, the outer end of the engine connecting pipe 13 is communicated with the gas engine, the liquid outlet stop valve 11 is opened, the gas emptying stop valve 21 is emptied, when the pressure sensor 7 detects that the pressure in the gas phase space of the natural gas cylinder 9 is lower than the set range and the temperature sensor 31 detects that the temperature of the cooling water in the vaporizer 3 is higher than the set temperature, the controller 8 controls the electromagnetic module of the booster pump 5 to be powered on to work, the liquefied natural gas entering the pressurized liquid inlet pipe 4 from the liquid outlet pipe 1 is sucked by the booster pump 5 and then output, and then enters the pressurized vaporizing pipe 41 to be heated and vaporized, the vaporized natural gas enters the gas phase space of the natural gas cylinder 9 through the pressurized gas return pipe 42 and the emptying pipe 2, so as to increase the pressure in the gas phase space of the natural gas cylinder 9 until the pressure sensor 7 detects that the pressure in the gas phase space of the natural gas cylinder 9 reaches the set range, the booster pump 5 stops operating. When the pressure sensor 7 detects that the pressure in the gas phase space of the natural gas cylinder 9 is higher than the set pressure range but lower than the set pressure values of the pipeline safety valve 22 and the vent safety valve 23, the controller 8 controls the pressure regulating stop valve 61 to be opened, and the gas in the gas phase space of the natural gas cylinder 9 is output through the vent pipe 2, the pressurization gas return pipe 42, the pressurization vaporization pipe 41, the pressure regulating connecting pipe 6 and the engine connecting pipe 13 in sequence and is preferentially supplied to the gas engine for use. When the pressure sensor 7 detects that the pressure in the gas phase space of the natural gas bottle 9 is higher than the pressure values set by the pipeline safety valve 22 and the emptying safety valve 23, the pipeline safety valve 22 and the emptying safety valve 23 are opened, so that the natural gas in the gas phase space is directly emptied to avoid potential safety hazards.

In the pressure-regulating gas supply system of the natural gas cylinder, the inner end of the pressurizing liquid inlet pipe 4 is connected to the liquid outlet pipe 1 between the liquid outlet stop valve 11 and the vaporizer 3, so that compared with the traditional gas supply system, a pipeline extending into the inner cylinder of the natural gas cylinder 9 through a corresponding connecting channel on the distribution head is reduced, and the heat insulation performance of the natural gas cylinder is improved. Because the liquid outlet pipe 1 can be communicated with the gas engine finally, when the gas engine works, the liquid outlet pipeline has no air resistance, so that the pressure regulating and gas supplying system of the natural gas cylinder does not need to be deflated manually before use. Liquefied natural gas output from the booster pump 5 enters the booster vaporization pipe 41 to be heated and vaporized, and the booster vaporization pipe 41 is arranged in the vaporizer 3, so that the liquefied natural gas in the booster vaporization pipe 41 is heated and vaporized by cooling water in an engine, and the boosting efficiency of a pressure-regulating gas supply system of the natural gas cylinder is higher.

The utility model has the advantages that: firstly, the method comprises the following steps: a booster pump 5 is adopted in a pressure-regulating gas supply system of a natural gas cylinder to suck liquefied natural gas and output the liquefied natural gas into a vaporizer 3 for vaporization, so that when the liquid level of the liquefied natural gas in a natural gas cylinder 9 is reduced to be less than 30% of a rated standard liquid level, the pressure-regulating gas supply system of the natural gas cylinder can still stably and efficiently pressurize. In the pressure-regulating gas supply system of the natural gas cylinder, the inlet end of a pressurizing liquid inlet pipe 4 is connected to the liquid outlet pipe 1 between the liquid outlet stop valve 11 and the vaporizer 3 and does not extend into the natural gas cylinder 9 through a corresponding connecting channel on the distributing head, so that the heat insulation performance of the natural gas cylinder is improved; compared with the common gas cylinder supply system, the natural gas cylinder pressure-regulating gas supply system with the structure reduces the number of the over-current protection valves, the pressurization stop valves and the like arranged on the pressurization vaporizer and the pressurization pipeline, so that the natural gas cylinder pressure-regulating gas supply system is lighter in self weight and is simpler and more convenient to operate. Thirdly, the utility model has the further advantages that: the booster pump 5 sucks and discharges media by drawing the piston 521 to reciprocate in the working cavity 52 of the pump body 51 through electromagnetic force, the piston 521 and each electromagnetic module driving the piston 521 to move do not need to be connected, the shell of each electromagnetic module is made of heat insulating materials, so that the cold energy in the pump body 51 can not be directly transmitted to the iron core 58 and the conductive winding 59 in the shell, and each electromagnetic module can normally work in a low-temperature environment of-196 ℃, so that a pressure regulating and gas supplying system of the natural gas cylinder provided with the booster pump 5 can work safely and stably, thereby ensuring that the liquefied natural gas in the natural gas cylinder reaches the pressure requirement of a gas engine after being vaporized, and the booster pump 5 driven by the electromagnetic force has small volume, simple structure, low energy consumption and light self weight.

Claims (10)

1. Pressure regulating gas supply system of natural gas cylinder includes: the inner blow-down pipe that stretches into in the natural gas cylinder gas phase space is provided with the atmospheric relief stop valve on the blow-down pipe, and the inner drain pipe that stretches into in the natural gas cylinder liquid phase space is provided with out the liquid stop valve on the drain pipe, and the drain pipe passes through the vaporizing tube and the engine connecting pipe intercommunication in the vaporizer, and the engine connecting pipe can communicate gas engine, its characterized in that: the inlet end of the pressurizing liquid inlet pipe is connected to a liquid outlet pipe between the liquid outlet stop valve and the vaporizer, the inlet of the pressurizing pump is communicated with the outlet end of the pressurizing liquid inlet pipe, the vaporizer is also provided with a pressurizing vaporization pipe, the outlet of the pressurizing pump is communicated with the inlet end of the pressurizing vaporization pipe, the outlet end of the pressurizing vaporization pipe is communicated with the inlet end of the pressurizing air return pipe, the outlet end of the pressurizing air return pipe is connected to a vent pipe at the outer end of the vent stop valve, and a pipeline safety valve is arranged on the vent pipe at the outer end of the connecting part of the pressurizing air return pipe and the vent pipe; the pressure-increasing vaporization pipe is communicated with the engine connecting pipe through a pressure-regulating connecting pipe, and a pressure-regulating stop valve is arranged on the pressure-regulating connecting pipe; and a pressure detection device capable of detecting the pressure in the gas phase space of the natural gas cylinder is also arranged.

2. A pressure regulating gas supply system for a natural gas cylinder according to claim 1, characterized in that: the booster pump include: the pump body is sealed at the periphery, a working cavity is arranged in the pump body, a suction inlet communicated with the working cavity is arranged in the middle of the side wall of the pump body, a first discharge port and a second discharge port communicated with the working cavity are respectively arranged on the pump body at two sides of the suction inlet, and check valves are respectively arranged on the suction inlet, the first discharge port and the second discharge port; a first electromagnetic module is fixed on the outer surface of the end wall of the pump body on the same side with the first discharge port, a second electromagnetic module is fixed on the outer surface of the end wall of the pump body on the same side with the second discharge port, the first electromagnetic module and the second electromagnetic module are oppositely arranged, a heat insulation layer is arranged between the shell of each electromagnetic module and the pump body, and a device capable of generating an electromagnetic field is arranged in each electromagnetic module; a piston arranged in the working cavity divides the working cavity into a first movable working cavity and a second movable working cavity which are isolated from each other, and an armature is fixed on the piston; the electromagnetic force generated when the first electromagnetic module works can pull the armature to drive the piston to move towards the first electromagnetic module, the electromagnetic force generated when the second electromagnetic module works can pull the armature to drive the piston to move towards the second electromagnetic module, so that the piston can reciprocate in a working section cavity between the first discharge port and the second discharge port, the first discharge port is always communicated with the first movable working cavity, the second discharge port is always communicated with the second movable working cavity, and the piston can repeatedly pass through the suction port in the reciprocating movement process in the working cavity, so that the suction port can be communicated with the first movable working cavity and the second movable working cavity; the suction inlet is communicated with the outlet end of the pressurizing liquid inlet pipe, and the first discharge port is communicated with the inlet end of the pressurizing vaporization pipe after being connected with the second discharge port in parallel.

3. A pressure regulating gas supply system for a natural gas cylinder according to claim 1 or 2, characterized in that: the pressure detection device is a pressure sensor, the vaporizer is also provided with a temperature sensor which can detect the temperature of cooling water in the vaporizer, and the pressure regulating stop valve is an electromagnetic valve; the booster pump, the pressure regulating stop valve, the pressure sensor and the temperature sensor are all connected with the controller through electric signals.

4. A pressure regulating gas supply system for a natural gas cylinder according to claim 1 or 2, characterized in that: the pressurizing vaporization pipe is U-shaped, the inlet end of the U-shaped pressurizing vaporization pipe is communicated with the outlet of the booster pump, the outlet end of the U-shaped pressurizing vaporization pipe is communicated with the inlet end of the pressurizing air return pipe, and the inlet end of the pressure regulating connecting pipe is connected to the bottom of the U-shaped pressurizing vaporization pipe.

5. A pressure regulating gas supply system for a natural gas cylinder according to claim 1 or 2, characterized in that: the liquid outlet pipe between the liquid outlet stop valve and the pressurizing liquid inlet pipe is provided with a one-way overflow valve which can control the flow rate of the liquefied natural gas in the liquid outlet pipe and prevent the liquefied natural gas in the liquid outlet pipe from flowing into the natural gas cylinder.

6. The pressure-regulating gas supply system of a natural gas cylinder according to claim 2, characterized in that: the armature and the piston are perpendicular to each other, and two ends of the armature respectively extend into the first movable working cavity and the second movable working cavity.

7. A pressure regulating gas supply system for a natural gas cylinder according to claim 6, characterized in that: the device which is arranged in each electromagnetic module and can generate an electromagnetic field is an iron core and a conductive winding wound on the iron core; the armature is provided with circumferential bulges at two ends, and the iron core is a horseshoe-shaped iron core.

8. A pressure regulating gas supply system for a natural gas cylinder according to claim 6 or 7, characterized in that: and buffer springs for reducing impact force between the armature and the inner wall of the working cavity are arranged in the first movable working cavity and the second movable working cavity.

9. The pressure-regulating gas supply system of a natural gas cylinder according to claim 2, characterized in that: the check valves arranged on the suction inlet, the first discharge port and the second discharge port are all ball check valves.

10. A pressure regulating gas supply system for a natural gas cylinder according to claim 1 or 2, characterized in that: an emptying safety valve is arranged on an emptying pipe at the inner end of the emptying stop valve.

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