LNG (Liquefied Natural Gas) gas-liquid double-acting high-efficiency liquid-gas conversion type low-temperature booster pump

Abstract

The invention discloses an LNG gas-liquid double-acting efficient liquid-gas conversion type low-temperature booster pump, and relates to the technical field of low-temperature booster pumps. The low-temperature booster pump comprises a pneumatic actuating mechanism, a hydraulic actuating mechanism, a vaporizer and a pump body. In a normal state, the LNG gas-liquid double-acting high-efficiency liquid-gas conversion type low-temperature booster pump works in an independent driving state, namely, the pneumatic actuating mechanism works in an independent working mode, and at the moment, a U-shaped three-position four-way electromagnetic valve of the hydraulic actuating mechanism is located at the middle position; or the hydraulic actuating mechanism works independently, namely, a U-shaped three-position four-way electromagnetic valve of the pneumatic actuating mechanism is in a middle position, and when the automobile needs higher power, the pneumatic actuating mechanism and the hydraulic actuating mechanism can be driven in a matched manner, namely, the pneumatic actuating mechanism and the hydraulic actuating mechanism work simultaneously, namely, a piston rod is driven pneumatically and hydraulically simultaneously to do reciprocating rectilinear motion. According to the invention, respective independent driving or mutual matched driving of pneumatic driving and hydraulic driving can be realized, so that the functions of quick response and matched driving to increase power are realized.

Description

Technical Field

[0001] The present application belongs to the technical field of cryogenic booster pumps, and in particular, relates to an LNG gas-liquid dual-acting high-efficiency liquid-to-gas conversion type cryogenic booster pump. Background Art

[0002] With the increasing global attention to climate change and environmental protection, and the continued high oil prices, natural gas vehicles are favored by the market due to their low emissions and low costs. Especially under the background of the "dual carbon" strategy, my country's natural gas market has entered a period of rapid growth, and natural gas heavy trucks and other models have gradually become mainstream new models. In addition, with the reorganization of international natural gas resources and markets and the improvement of domestic natural gas supply levels, the supply of natural gas vehicles will be more stable in the future, and prices will also tend to stabilize. This will further stimulate the development of the natural gas vehicle market and promote its development in a more environmentally friendly, efficient and intelligent direction.

[0003] The LNG vehicle gas supply system is one of the main components of LNG vehicles, mainly including special vehicle-mounted cryogenic insulation bottles, filling interfaces, LNG pumps, valves, LNG vaporizers, pressure displays and other components. Its basic function is to continuously and stably provide sufficient LNG fuel for the engine; foreign LNG vehicle gas supply systems mainly use saturated steam technology and high-pressure direct injection (HPDI) gas supply technology. At present, due to the great difficulty in the development of HPDI gas supply systems and HPP pumps, most domestic LNG commercial vehicle parts suppliers are still engaged in the production of saturated steam and self-pressurization technology-related gas supply devices with relatively low technical barriers. Summary of the invention

[0004] In order to overcome the shortcomings of the above-mentioned prior art, the purpose of this application is to provide an LNG gas-liquid dual-acting high-efficiency liquid-to-gas conversion low-temperature booster pump, which can achieve the purpose of redundantly driving a low-temperature isobaric pump in multiple driving modes and has the advantages of simple structure and easy operation.

[0005] In order to achieve the above objectives, this application adopts the following technical solutions:

[0006] The invention discloses an LNG gas-liquid double-acting high-efficiency liquid-to-gas conversion type low-temperature booster pump, comprising a pneumatic actuator, a hydraulic actuator, a vaporizer and a pump body.

[0007] Furthermore, the pneumatic actuator includes a cylinder housing, a cylinder piston, a piston rod installed on the cylinder piston, a cylinder seat and an air circuit control pipeline; the air circuit control pipeline includes a U-shaped three-position four-way solenoid valve, a pneumatic pump overflow valve, a pneumatic pump check valve and a pneumatic pump; when the U-shaped three-position four-way solenoid valve works in the left position or the right position, the cylinder piston drives the piston rod to realize up and down reciprocating motion; when the U-shaped three-position four-way solenoid valve is in the middle position, the piston rod moves in the direction of the force under the action of external force, and the pneumatic pump is unloaded through the pneumatic pump overflow valve.

[0008] Furthermore, the hydraulic actuator includes a hydraulic cylinder housing, a hydraulic piston, a hydraulic seat and a liquid circuit.

[0009] Furthermore, the pump body includes a piston rod sleeve, a pump body flange, a pump body shell, a pump body piston and an LNG liquid circuit; the LNG liquid circuit includes an LNG inlet check valve, an LNG filter, an LNG storage tank, an LNG liquid delivery pipeline and an LNG outlet check valve; when the piston cylinder moves upward, the LNG inlet check valve opens, the LNG outlet check valve closes, and the LNG liquid enters the pump body from the LNG storage tank; when the piston cylinder moves downward, the LNG inlet check valve closes, the LNG outlet check valve opens, and the LNG liquid enters the LNG liquid delivery pipeline from the pump body.

[0010] Furthermore, the vaporizer includes a vaporizer shell, a vaporization flow channel, an LNG output port, a vaporizer medium input port and a vaporizer medium output port; LNG compressed liquid enters the vaporization flow channel from the LNG liquid delivery pipeline, and is vaporized into combustible LNG gas through heat exchange with the vaporizer medium, and is output from the LNG output port to the inside of the automobile engine; the cross-sectional diameters of the LNG liquid delivery pipeline and the LNG output port are the same, and are both smaller than the inlet and outlet cross-sectional diameters of the vaporization flow channel; a uniformly distributed small-hole flow channel is provided inside the vaporization flow channel, and the number of small holes in the outlet cross-sectional area of ​​the vaporization flow channel is greater than the number of small holes in the inlet cross-sectional area of ​​the vaporization flow channel.

[0011] Compared with the prior art, the LNG gas-liquid dual-acting high-efficiency liquid-gas conversion low-temperature booster pump provided in this application has the following beneficial effects:

[0012] (1) Simple operation, easy maintenance and high control accuracy.

[0013] (2) The vaporizer has higher heat exchange efficiency, which is beneficial to improving the efficiency of LNG vehicles.

[0014] (3) The gas-liquid drive part described in the present application integrates the concepts of "distributed multi-power" and "safety redundancy". The pneumatic actuator and the hydraulic actuator can work in coordination with each other, or one can work while the other is pending. When a pneumatic actuator fails, it can be controlled by the hydraulic actuator. When a hydraulic actuator fails, it can be controlled by the pneumatic actuator without affecting the operation of the entire actuator. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is an overall schematic diagram of this application.

[0016] Figure 2 It is a structural diagram of a pneumatic actuator.

[0017] Figure 3 It is a schematic diagram of the structure of the vaporizer.

[0018] Description of the numbers in the figure:

[0019] Pneumatic actuator 100, hydraulic actuator 200, vaporizer 300, pump body 400, air control pipeline 500, cylinder housing 1, cylinder piston 2, piston rod 3, cylinder seat 4, U-shaped three-position four-way solenoid valve 5, pneumatic pump overflow valve 6, pneumatic pump check valve 7, pneumatic pump 8, hydraulic cylinder housing 9, hydraulic piston 10, hydraulic seat 11, vaporizer housing 12, vaporization flow channel 13, LNG output port 14, vaporizer medium input port 15, vaporizer medium output port 16, piston rod sleeve 17, pump body flange 18, pump body housing 19, pump body piston 20, LNG liquid inlet check valve 21, LNG filter 22, LNG storage tank 23, LNG liquid delivery pipeline 24, LNG liquid outlet check valve 25. DETAILED DESCRIPTION

[0020] The present application is further described in detail below in conjunction with the accompanying drawings.

[0021] Reference Figure 1 , a LNG gas-liquid dual-acting high-efficiency liquid-gas conversion type low-temperature booster pump, comprising a pneumatic actuator 100, a hydraulic actuator 200, a vaporizer 300, and a pump body 400. Among them, the gas path of the pneumatic actuator is indicated by a gas path control pipeline 500.

[0022] Reference Figure 1 and Figure 2The pneumatic actuator 100 includes a cylinder housing 1, a cylinder piston 2, a piston rod 3 installed on the cylinder piston 2, a cylinder seat 4 and an air circuit control pipeline 500. Among them, the air circuit control pipeline 500 includes a U-shaped three-position four-way solenoid valve 5, a pneumatic pump overflow valve 6, a pneumatic pump check valve 7 and a pneumatic pump 8. When working, the U-shaped three-position four-way solenoid valve 5 works in the left position or the right position, and drives the piston rod 3 to move up and down through the cylinder piston 2. When the U-shaped three-position four-way solenoid valve 5 is in the middle position, the internal pipeline of the cylinder is connected. At this time, the cylinder can move in the direction of the force under the action of external force; the pneumatic pump 8 can also be unloaded through the pneumatic pump overflow valve 6 at this time to prevent failure.

[0023] Reference Figure 1 The hydraulic actuator 200 includes a hydraulic cylinder housing 9, a hydraulic piston 10, a hydraulic seat 11 and a liquid circuit. The principle diagram of the liquid circuit is similar to the principle diagram of the gas circuit, and will not be repeated here.

[0024] Reference Figure 1 and Figure 3 The vaporizer 300 includes a vaporizer housing 12, a vaporizer flow channel 13, an LNG output port 14, a vaporizer medium input port 15, and a vaporizer medium output port 16. The LNG compressed liquid enters the vaporizer flow channel 13 from the LNG liquid delivery pipeline 24, and is vaporized into LNG gas that can be combusted through heat exchange with the vaporizer medium, and is output from the LNG output port 14 to the inside of the automobile engine; Figure 3 As shown in a and d, the cross-sectional diameters of the LNG liquid delivery pipeline 24 and the LNG outlet 14 are the same, both smaller than the inlet and outlet cross-sectional diameters of the vaporization flow channel 13, but the cross-sectional areas of the four places are the same, as shown in FIG. Figure 3 As shown in b and c, there are evenly distributed small hole flow channels inside the vaporization flow channel 13, and the number of small holes in the outlet cross section of the vaporization flow channel 13 is greater than the number of small holes in the inlet cross section of the vaporization flow channel 13.

[0025] Reference Figure 1 The pump body 400 includes a piston rod sleeve 17, a pump body flange 18, a pump body shell 19, a pump body piston 20 and an LNG liquid circuit. The LNG liquid circuit includes an LNG liquid inlet check valve 21, an LNG filter 22, an LNG storage tank 23, an LNG liquid delivery pipeline 24 and an LNG liquid outlet check valve 25. When the piston cylinder 3 moves upward, the LNG liquid inlet check valve 21 opens, the LNG liquid outlet check valve 25 closes, and the LNG liquid enters the pump body from the LNG storage tank 23. When the piston cylinder 3 moves downward, the LNG liquid inlet check valve 21 closes, the LNG liquid outlet check valve 25 opens, and the LNG liquid enters the LNG liquid delivery pipeline 24 from the pump body.

[0026] The working principle of this application is:

[0027] The low temperature booster pump is driven by a pneumatic actuator 100 and a hydraulic actuator 200 respectively. The different combinations of the two driving modes can realize at least the following three working modes:

[0028] (1) Pneumatic actuator 100 single working mode (the U-shaped three-position four-way solenoid valve of hydraulic actuator 200 is in the middle position):

[0029] When working, the U-shaped three-position four-way solenoid valve 5 works in the left position or the right position, and drives the piston rod 3 to realize up and down reciprocating motion through the cylinder piston 2; when the U-shaped three-position four-way solenoid valve 5 is in the middle position, the internal pipeline of the cylinder is connected, and the cylinder can move in the direction of the force under the action of external force; the pneumatic pump 8 can also unload through the pneumatic pump overflow valve 6 at this time to prevent malfunction.

[0030] (2) Hydraulic actuator 200 single working mode (U-shaped three-position four-way solenoid valve 5 of pneumatic actuator 100 is in the middle position):

[0031] When working, the U-shaped three-position four-way solenoid valve of the hydraulic actuator 200 works in the left position or the right position, and drives the piston rod 3 to realize up and down reciprocating movement through the hydraulic piston 10; when the U-shaped three-position four-way solenoid valve is in the middle position, the internal pipeline of the hydraulic cylinder is connected, and the hydraulic cylinder can move in the direction of the force under the action of external force; the hydraulic pump can also unload through the hydraulic pump overflow valve at this time to prevent malfunction.

[0032] (3) Working mode in which the pneumatic actuator 100 and the hydraulic actuator II work simultaneously (the pneumatic and hydraulic actuators simultaneously drive the piston rod 3 to perform reciprocating linear motion):

[0033] The pneumatic pump 8 and the hydraulic pump are controlled simultaneously to realize the simultaneous up and down reciprocating control of the piston rod 3. In this working mode, the LNG gas-liquid dual-acting high-efficiency liquid-to-gas conversion low-temperature booster pump will reach the maximum power.

Claims

1. An LNG gas-liquid dual-acting high-efficiency liquid-gas conversion low-temperature booster pump, characterized in that: It includes a pneumatic actuator, a hydraulic actuator, a carburetor and a pump body.

2. The LNG gas-liquid dual-acting high-efficiency liquid-to-gas conversion low-temperature booster pump according to claim 1 is characterized in that: The pneumatic actuator includes a cylinder housing, a cylinder piston, a piston rod installed on the cylinder piston, a cylinder seat and an air circuit control pipeline; the air circuit control pipeline includes a U-shaped three-position four-way solenoid valve, a pneumatic pump overflow valve, a pneumatic pump one-way valve and a pneumatic pump; when the U-shaped three-position four-way solenoid valve works in the left position or the right position, the cylinder piston drives the piston rod to realize up and down reciprocating motion; when the U-shaped three-position four-way solenoid valve is in the middle position, the piston rod moves in the direction of the force under the action of external force, and the pneumatic pump is unloaded through the pneumatic pump overflow valve.

3. The LNG gas-liquid dual-acting high-efficiency liquid-to-gas conversion low-temperature booster pump according to claim 2 is characterized in that: The hydraulic actuator comprises a hydraulic cylinder housing, a hydraulic piston, a hydraulic seat and a liquid circuit.

4. The LNG gas-liquid dual-acting high-efficiency liquid-to-gas conversion low-temperature booster pump according to claim 3 is characterized by: The pump body includes a piston rod sleeve, a pump body flange, a pump body shell, a pump body piston and an LNG liquid circuit; the LNG liquid circuit includes an LNG liquid inlet check valve, an LNG filter, an LNG storage tank, an LNG liquid delivery pipeline and an LNG liquid outlet check valve; when the piston cylinder moves upward, the LNG liquid inlet check valve opens, the LNG liquid outlet check valve closes, and LNG liquid enters the pump body from the LNG storage tank; when the piston cylinder moves downward, the LNG liquid inlet check valve closes, the LNG liquid outlet check valve opens, and LNG liquid enters the LNG liquid delivery pipeline from the pump body.

5. The LNG gas-liquid dual-acting high-efficiency liquid-to-gas conversion low-temperature booster pump according to claim 4 is characterized in that: The vaporizer includes a vaporizer shell, a vaporization flow channel, an LNG output port, a vaporizer medium input port and a vaporizer medium output port; LNG compressed liquid enters the vaporization flow channel from the LNG liquid delivery pipeline, and is vaporized into combustible LNG gas through heat exchange with the vaporizer medium, and is output from the LNG output port to the inside of the automobile engine; the cross-sectional diameters of the LNG liquid delivery pipeline and the LNG output port are the same, and are both smaller than the inlet and outlet cross-sectional diameters of the vaporization flow channel; a uniformly distributed small-hole flow channel is provided inside the vaporization flow channel, and the number of small holes in the outlet cross-sectional area of ​​the vaporization flow channel is greater than the number of small holes in the inlet cross-sectional area of ​​the vaporization flow channel.

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