阅读说明：本技术 低温环境作业出液泵及车载lng气瓶 (Low-temperature environment operation liquid outlet pump and vehicle-mounted LNG (liquefied Natural gas) cylinder ) 是由 李芳霞 李峰 王建京 韩利 李珍珍 郭茜茹 何荣 于 2020-07-17 设计创作，主要内容包括：本发明公开了一种低温环境作业出液泵及车载LNG气瓶。所公开的低温环境作业出液泵包括沿出液泵轴向设置的液压缸、缸套和活塞缸；液压缸内设有动力活塞,动力活塞上连接有活塞杆,活塞杆穿过所述缸套至活塞缸,且位于活塞缸的活塞杆端部设有工作活塞；活塞缸上设有进液口和出液口,进液口和出液口均设有阀门；缸套的外径小于液压缸外径及活塞缸的外径,液压缸和活塞缸之间还设有安装套管,且缸套位于安装套管内,安装套管与缸套之间形成隔热空腔；出液口连接有出液管。所公开的车载LNG气瓶为安装有本发明出液泵的气瓶。本发明的出液泵靠隔热空腔使空气到气瓶内产生足够大的温度梯度实现绝热；使用于气瓶时,气瓶工作控制更加简便。(The invention discloses a liquid outlet pump for low-temperature environment operation and a vehicle-mounted LNG (liquefied natural gas) cylinder. The disclosed liquid outlet pump for low-temperature environment operation comprises a hydraulic cylinder, a cylinder sleeve and a piston cylinder which are arranged along the axial direction of the liquid outlet pump; a power piston is arranged in the hydraulic cylinder, a piston rod is connected to the power piston, the piston rod penetrates through the cylinder sleeve to the piston cylinder, and a working piston is arranged at the end part of the piston rod positioned in the piston cylinder; the piston cylinder is provided with a liquid inlet and a liquid outlet, and the liquid inlet and the liquid outlet are both provided with valves; the outer diameter of the cylinder sleeve is smaller than that of the hydraulic cylinder and that of the piston cylinder, an installation sleeve is arranged between the hydraulic cylinder and the piston cylinder, the cylinder sleeve is positioned in the installation sleeve, and a heat insulation cavity is formed between the installation sleeve and the cylinder sleeve; the liquid outlet is connected with a liquid outlet pipe. The disclosed vehicle-mounted LNG gas cylinder is provided with the liquid outlet pump. The liquid outlet pump of the invention utilizes the heat insulation cavity to generate enough temperature gradient from air to the gas cylinder to realize heat insulation; when the gas cylinder is used, the gas cylinder is more convenient to work and control.)

1. A liquid outlet pump for low-temperature environment operation is characterized by comprising a hydraulic cylinder, a cylinder sleeve and a piston cylinder which are arranged along the axial direction of the liquid outlet pump;

a power piston is arranged in the hydraulic cylinder, a piston rod is connected to the power piston, the piston rod penetrates through the cylinder sleeve to the piston cylinder, and a working piston is arranged at the end part of the piston rod positioned in the piston cylinder; a liquid inlet and a liquid outlet are arranged on the piston cylinder, and valves are arranged on the liquid inlet and the liquid outlet;

the outer diameter of the cylinder sleeve is smaller than that of the hydraulic cylinder and that of the piston cylinder, an installation sleeve is arranged between the hydraulic cylinder and the piston cylinder, the cylinder sleeve is positioned in the installation sleeve, and a heat insulation cavity is formed between the installation sleeve and the cylinder sleeve;

the liquid outlet is connected with a liquid outlet pipe.

2. The low-temperature environment operation liquid outlet pump as claimed in claim 1, wherein the axial length of the cylinder sleeve is greater than that of the piston cylinder, and the axial length of the cylinder sleeve meets the heat insulation requirement of the liquid outlet pump.

3. The low-temperature environment operation liquid outlet pump as claimed in claim 2, wherein the axial length of the cylinder sleeve is selected from 600 mm to 800 mm.

4. The cryogenic environment working effluent pump of claim 2 wherein the piston cylinder has an axial length selected from the range of 100 to 200 mm.

5. The cryogenic environment process effluent pump of claim 1 wherein the mounting collar has an inside diameter greater than or equal to the outside diameter of the hydraulic cylinder and the outside diameter of the piston cylinder.

6. The cryogenic environment working effluent pump of claim 1 wherein the range of operation of the effluent pump is between 0 and 20g natural gas/s.

7. The cryogenic environment process effluent pump of claim 1 wherein the effluent pipe extends through the insulated cavity outside the piston cylinder to outside the cylinder.

8. The cryogenic environment process effluent pump of claim 1 wherein the inlet port is located at an end of the effluent pump and the outlet port is located at a side of the effluent pump.

9. The low-temperature environment operation liquid outlet pump as claimed in claim 1, wherein the hydraulic cylinder is connected with the cylinder sleeve through a first flange, the cylinder sleeve is hermetically connected with the piston cylinder through a second flange, and two ends of the mounting sleeve are respectively connected with the first flange and the second flange.

10. The low-temperature environment operation liquid outlet pump as claimed in claim 1, wherein the piston rod, the cylinder sleeve, the mounting sleeve, the liquid outlet pipe, the piston cylinder, the working piston and the valve are made of materials capable of resisting low-temperature environment.

11. The utility model provides an on-vehicle LNG gas cylinder, includes the gas cylinder body, its characterized in that, be equipped with out the liquid pump mounting hole on the gas cylinder body, go out the liquid pump and insert the axis face that passes the gas cylinder in the gas cylinder through the mounting hole to one side, and the pneumatic cylinder is located the gas cylinder outside, goes out liquid pump axial and gas cylinder axial simultaneously and keeps reasonable contained angle, goes out liquid pump inlet and gas cylinder bottom in and keeps reasonable distance.

12. The on-board LNG cylinder according to claim 10, characterized in that said reasonable included angle is 29 ° ± 5 ° and said reasonable distance is 30 ± 2 mm.

13. The on-board LNG gas cylinder of claim 10, wherein the mounting sleeve of the tapping pump is welded into the mounting hole.

14. The vehicle-mounted LNG cylinder according to claim 10, wherein the vehicle-mounted LNG cylinder comprises a cylinder body, the cylinder body comprises a cylinder body and a cylinder liner, the cylinder liner is located in the cylinder body, a vacuum interlayer is formed between the cylinder body and the cylinder liner, a cylinder separator is arranged at one end of the cylinder body, and a sliding support is arranged at the other end of the cylinder body; the liquid outlet pump mounting hole and the gas cylinder separator are located on the same side wall and deviate from the gas cylinder distributor.

Technical Field

The invention relates to a liquid outlet pump, in particular to a liquid outlet pump for low-temperature environment operation and a vehicle-mounted LNG (liquefied natural gas) bottle provided with the liquid outlet pump.

Background

The conventional liquid outlet pump is not suitable for low-temperature environment (such as subzero) operation, such as a vehicle-mounted LNG low-temperature heat-insulation gas cylinder, and the temperature inside the vehicle-mounted LNG low-temperature heat-insulation gas cylinder is-196 ℃. The vehicle-mounted LNG low-temperature heat-insulation gas cylinder (hereinafter referred to as a gas cylinder) is used for storing LNG automobile fuel, when liquid needs to be discharged, LNG is pressed out to the heat exchanger by means of the pressure of a gas phase space in the gas cylinder, gasified in the heat exchanger and then enters the buffer tank, and then enters an automobile engine through the voltage stabilizer.

Disclosure of Invention

Aiming at the defects or shortcomings of the prior art, the invention provides a liquid outlet pump for low-temperature environment operation.

Therefore, the low-temperature environment operation liquid outlet pump provided by the invention comprises a hydraulic cylinder, a cylinder sleeve and a piston cylinder which are axially arranged along the liquid outlet pump; a power piston is arranged in the hydraulic cylinder, a piston rod is connected to the power piston, the piston rod penetrates through the cylinder sleeve to the piston cylinder, and a working piston is arranged at the end part of the piston rod positioned in the piston cylinder; a liquid inlet and a liquid outlet are arranged on the piston cylinder, and valves are arranged on the liquid inlet and the liquid outlet; the outer diameter of the cylinder sleeve is smaller than that of the hydraulic cylinder and that of the piston cylinder, an installation sleeve is arranged between the hydraulic cylinder and the piston cylinder, the cylinder sleeve is positioned in the installation sleeve, and a heat insulation cavity is formed between the installation sleeve and the cylinder sleeve; the liquid outlet is connected with a liquid outlet pipe.

Optionally, the axial length of the cylinder sleeve is greater than that of the piston cylinder, and the axial length of the cylinder sleeve meets the heat insulation requirement of the liquid outlet pump.

Optionally, the axial length of the cylinder sleeve is 600-800 mm.

Optionally, the axial length of the piston cylinder is selected from 100-200 mm.

Optionally, the inner diameter of the mounting sleeve is greater than or equal to the outer diameter of the hydraulic cylinder and the outer diameter of the piston cylinder.

Further, the working range of the liquid outlet pump is 0-20 g of natural gas/s.

In some schemes, the liquid outlet pipe passes through the outside of the piston cylinder and passes through the heat insulation cavity to extend to the outside of the hydraulic cylinder.

Further, the liquid inlet is located the tip of going out the liquid pump, the liquid outlet is located the lateral part of going out the liquid pump.

Optionally, the hydraulic cylinder is connected with the cylinder sleeve through a first flange, the cylinder sleeve is connected with the piston cylinder through a second flange in a sealing manner, and two ends of the mounting sleeve are respectively connected with the first flange and the second flange.

Furthermore, the piston rod, the cylinder sleeve, the mounting sleeve, the liquid outlet pipe, the piston cylinder, the working piston and the valve are made of materials capable of resisting low-temperature environment.

Meanwhile, the invention also provides a vehicle-mounted LNG cylinder.

Therefore, the vehicle-mounted LNG gas cylinder provided by the invention comprises a gas cylinder body, wherein a liquid outlet pump mounting hole is formed in the gas cylinder body, a liquid outlet pump is obliquely inserted into the gas cylinder through the mounting hole and penetrates through the middle shaft surface of the gas cylinder, the hydraulic cylinder is positioned outside the gas cylinder, meanwhile, a reasonable included angle is kept between the axial direction of the liquid outlet pump and the axial direction of the gas cylinder, and a reasonable distance is kept between the liquid inlet of the liquid outlet pump and the inner bottom of.

Preferably, the reasonable included angle is 29 degrees plus or minus 5 degrees, and the reasonable distance is 30 plus or minus 2 mm.

Further, the mounting sleeve of the liquid outlet pump is welded in the mounting hole.

Further, the vehicle-mounted LNG cylinder comprises a cylinder body, the cylinder body comprises a cylinder body and a cylinder liner, the cylinder liner is positioned in the cylinder body, a vacuum interlayer is formed between the cylinder body and the cylinder liner, a cylinder separator is arranged at one end of the cylinder body, and a sliding support is arranged at the other end of the cylinder body; the liquid outlet pump mounting hole and the gas cylinder separator are located on the same side wall and deviate from the gas cylinder distributor.

The invention has the beneficial effects that:

the liquid outlet pump of the invention utilizes the heat insulation cavity to generate enough temperature gradient from air to the gas cylinder to realize heat insulation.

Furthermore, when the liquid outlet pump is used for the gas cylinder, the liquid outlet pump can adjust the liquid outlet amount of the gas cylinder from 0-20 g/s (natural gas) according to the change of the gas consumption of the engine, so that the large gas consumption of the engine can be ensured, the discharge frequency of a safety valve on a buffer tank is reduced, and the fuel is saved; meanwhile, the LNG output is controlled by the liquid outlet pump of the gas cylinder, the saturated vapor pressure in the gas cylinder is not required to be controlled, the gas cylinder is not required to be provided with a self-pressurization system, elements such as a manual stop valve, a pressurization regulating valve, a temperature control heat exchanger and the like can be eliminated, and the control is simpler and more convenient.

Drawings

FIG. 1 is a schematic view of a liquid pump according to the present invention;

FIG. 2 is a reference schematic diagram of a gas cylinder structure equipped with a liquid outlet pump according to the present invention;

fig. 3 is a reference schematic diagram of the structure of the gas cylinder in the comparative example.

In the figure: 1-a hydraulic cylinder; 2-a power piston; 3-a piston rod; 4-a first flange; 5, cylinder sleeve; 6-a second flange; 7-a liquid outlet pipe; 8, a piston cylinder; 9-a working piston; 10-liquid inlet one-way valve; 11, a liquid outlet one-way valve; 12-installing a sleeve; 13-a thermally insulating cavity; a-a power end; b-a heat insulation section; c-a working end; 13-a liquid outlet pump; 14, a gas cylinder body; 15-vacuum interlayer; 16-gas cylinder liner; 17-gas cylinder distributor (including filler pipe); 18-sliding support; s-distance between the pump inlet and the bottle bottom.

Detailed Description

Unless otherwise indicated, the terms and names of components in the present invention are understood according to their conventional understanding in the art or are implemented by means of the prior art.

As used herein, directional terminology, such as "axial," "radial," "longitudinal," "inner," etc., refers to the corresponding direction or position as illustrated in the accompanying drawings; the axial direction of the liquid outlet pump is also the movement direction of a piston in the pump.

The liquid outlet pump is mainly suitable for low-temperature working environment, the liquid outlet pump can work in the low-temperature environment by meeting the heat insulation requirement, the heat insulation requirement means that air in the liquid outlet pump generates enough temperature gradient to the low-temperature environment (such as in a gas cylinder) to realize heat insulation, the influence of the environment temperature and the temperature generated when a piston of the liquid outlet pump works on the low-temperature working environment is reduced, and the heat insulation is mainly realized by a heat insulation cavity between the mounting sleeve and the cylinder sleeve.

The invention further controls and controls the heat insulation efficiency through the axial size of the heat insulation cavity. Further, the axial dimension of the cylinder sleeve can be selected to be 600-800 mm in consideration of the space in the vehicle-mounted gas cylinder. In addition, the axial size of the liquid outlet pump and the installation angle of the liquid outlet pump in the gas cylinder also influence the gas taking condition of the pump in the gas cylinder, therefore, the heat insulation effect, the liquid outlet continuity, the stability and the controllability are comprehensively considered, the axial size of the cylinder sleeve can be 600-800 mm, the axial length of the piston cylinder is 100-200 mm, on the basis, the axial length of the liquid outlet pump is preferably 1000-1800 mm, and the axial length of the hydraulic cylinder is more than 100 mm.

In order to better realize the use on the automobile, the working range or the air supply quantity of the liquid outlet pump is 0-20 g of natural gas/s. In one embodiment, the radial dimension of each component can be determined according to the air supply amount of the liquid outlet pump.

Furthermore, the liquid outlet pump is made of a material capable of resisting the temperature of 196 ℃ below zero so as to adapt to the low-temperature working environment.

The gas cylinder body and the vehicle-mounted gas cylinder comprise the conventional vehicle-mounted gas cylinder and the vehicle-mounted gas cylinder which can realize the functions of the conventional vehicle-mounted gas cylinder without violating the design concept and the purpose of the invention. Its example structure is as shown in fig. 2, including the gas cylinder body, the gas cylinder body includes gas cylinder barrel and gas cylinder inner bag, the gas cylinder inner bag is located the gas cylinder barrel and forms the vacuum intermediate layer between the two, a tip of gas cylinder body is equipped with the gas cylinder separator, the other end is equipped with the slip support, gas cylinder barrel 3 is fixed by gas cylinder distributor 6 end with gas cylinder inner bag 4, and prolong 7 end slips and produce stress in order to prevent that gas cylinder inner bag 4 warp when the temperature variation, gas cylinder inner bag 4 except that 6 end faces of distributor all can produce the deformation and remove, so go out the liquid pump and install on the terminal surface of distributor end and avoid distributor 6.