CN214403761U

CN214403761U - Dual-fuel system of internal combustion engine

Info

Publication number: CN214403761U
Application number: CN202120089389.7U
Authority: CN
Inventors: 张祥; 王平; 赵高见; 王玲
Original assignee: Anhui Heli Co Ltd
Current assignee: Anhui Heli Co Ltd
Priority date: 2021-01-13
Filing date: 2021-01-13
Publication date: 2021-10-15
Anticipated expiration: 2031-01-13

Abstract

The utility model discloses a dual-fuel system of an internal combustion engine, which comprises an LPG fuel part, a gasoline pipeline and a fuel selection control part, wherein the LPG fuel part and the gasoline pipeline are connected with the engine; the LPG fuel part comprises at least one gas storage steel cylinder, a gas outlet of the gas storage steel cylinder is connected with a high-pressure gas pipe, the high-pressure gas pipe is connected with an evaporator, the evaporator is communicated with an engine through a low-pressure gas pipe, and a heating device for heating the evaporator is arranged on the evaporator; the gasoline pipeline comprises an oil inlet pipe communicated with the oil tank, the oil inlet pipe is connected with a gasoline pump, the oil outlet of the gasoline pump is communicated with the engine through a fuel pipe, the LPG supply pipeline and the gasoline supply pipeline are arranged, and the two fuel supply pipelines work respectively, so that corresponding fuel can be accurately provided for the engine, and the supply pipeline is simple in structure and easy to install.

Description

Dual-fuel system of internal combustion engine

Technical Field

The utility model relates to an engine fuel supply system specifically is an internal-combustion engine dual fuel system.

Background

LPG (liquefied petroleum gas) forklifts are divided into single-fuel and dual-fuel vehicle types, and the single-fuel forklift only can use LPG as fuel; the dual-fuel forklift can use LPG as fuel and gasoline as fuel, can finish the application of various working conditions of a common forklift, and is very suitable for areas with LPG filling stations and abundant gas sources. Compared with a diesel forklift, the LPG has the advantages of greatly reducing the exhaust emission, having little carbon deposition during combustion, having good engine lubrication state and prolonging the service life of the engine.

However, most of the existing LPG forklifts are single-fuel vehicle types, the double-fuel vehicle types are complex in structure, fuel supply pipelines are complex and not concise, and control is not accurate.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a dual fuel system of internal-combustion engine to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme:

a dual fuel system of an internal combustion engine comprises an LPG fuel part, a gasoline pipeline and a fuel selection control part, wherein the LPG fuel part and the gasoline pipeline are connected with the engine;

the LPG fuel part comprises at least one gas storage steel cylinder, a gas outlet of the gas storage steel cylinder is connected with a high-pressure gas pipe, the high-pressure gas pipe is connected with an evaporator, the evaporator is communicated with an engine through a low-pressure gas pipe, and a heating device for heating the evaporator is arranged on the evaporator;

the gasoline pipeline comprises an oil inlet pipe communicated with the gasoline tank, the oil inlet pipe is connected with a gasoline pump, and the oil outlet of the gasoline pump is communicated with the engine through a fuel pipe.

As a further aspect of the present invention: the gas storage steel cylinders are arranged in two numbers, and the two gas storage steel cylinders are both connected with a high-pressure gas pipe, and the high-pressure gas pipe is detachably connected with the gas storage steel cylinders through quick change connectors.

As a further aspect of the present invention: the high-pressure air pipes are communicated through a four-way joint, and a pressure safety valve is connected to the four-way joint.

As a further aspect of the present invention: the heating device is a gasification water path, the gasification water path comprises a heat exchange device connected with the evaporator, one end of the heat exchange device is communicated with the engine water jacket through a hot water pipe, and the other end of the heat exchange device is communicated with the engine water inlet through a circulating water pipe.

As a further aspect of the present invention: the gasoline pump is characterized in that a filter is arranged between the gasoline inlet pipe and the gasoline pump, the gasoline outlet of the gasoline pump is connected with a second electromagnetic valve, the second electromagnetic valve is communicated with the fuel pipe, and the second electromagnetic valve is communicated with the gasoline tank through an oil return pipe.

As a further aspect of the present invention: the fuel selection control part comprises a gasoline selection switch and an LPG selection switch.

As a further aspect of the present invention: the gasoline selection switch is communicated with an engine ECU, and the engine ECU is communicated with the gasoline pump.

As a further aspect of the present invention: the high-pressure gas pipe is communicated with the evaporator through a first electromagnetic valve, and the LPG selector switch is communicated with the first electromagnetic valve.

As a further aspect of the present invention: the front end of the first electromagnetic valve is provided with a low-pressure alarm which comprises a low liquid level indicator lamp and a low liquid level indicator switch, wherein the low liquid level indicator lamp is communicated with the LPG selector switch.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the LPG supply pipeline and the gasoline supply pipeline are arranged, and the two fuel supply pipelines work respectively, so that corresponding fuel can be accurately provided for the engine, and the supply pipeline is simple in structure and easy to install;

2. the heating device is arranged at the evaporator in the LPG supply pipeline, and the evaporator is heated by introducing engine cooling water, so that the waste heat of the engine is effectively utilized, and the evaporated LPG is heated, so that the temperature of the evaporated gaseous LPG is changed, and the evaporated gaseous LPG is easier to burn;

3. this application still is equipped with low pressure alarm device, the atmospheric pressure level of real-time supervision air supply line. When the air pressure in the air supply pipeline is lower than the set threshold value, a low-pressure alarm can be provided to prompt a driver to supplement the fuel gas.

Drawings

FIG. 1 is a schematic structural diagram of the present embodiment;

FIG. 2 is a schematic view of an LPG pipeline of the present embodiment;

FIG. 3 is a schematic view of the LPG pipeline of this embodiment;

FIG. 4 is a schematic view of a gasoline pipeline according to the present embodiment;

fig. 5 is a schematic diagram of a control circuit according to the present embodiment.

In the figure: 1-LPG fuel part, 11-LPG fuel pipeline, 111-gas storage steel cylinder, 112-quick change connector, 113-high pressure gas pipe, 114-low pressure gas pipe, 115-low pressure alarm, 116-first electromagnetic valve, 117-evaporator, 118-four-way connector, 12-gasification water path, 121-hot water pipe and 122-circulating water pipe;

2-gasoline pipeline, 21-gasoline pump, 22-filter, 23-second electromagnetic valve, 24-oil inlet pipe, 25-fuel oil pipe and 26-oil return pipe;

3-fuel selection control part, 31-gasoline selection switch, 32-engine ECU, 33-LPG selection switch, 34-low liquid level indicator lamp and 35-low liquid level indicator switch.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1 to 5, in an embodiment of the present invention, a dual fuel system for an internal combustion engine includes an LPG fuel section 1 connected to the engine, a gasoline line 2, and a fuel selection control section 3 for opening or closing the LPG fuel section 1 and the gasoline line 2.

The LPG fuel section includes at least one gas storage steel cylinder 111, a gas outlet of the gas storage steel cylinder 111 is connected to a high pressure gas pipe 113, in this embodiment, the gas storage steel cylinders 111 are two, and both the two gas storage steel cylinders 111 are connected to the high pressure gas pipe 113, the high pressure gas pipe 113 is detachably connected to the gas storage steel cylinders 111 through a quick-change connector 112, the high pressure gas pipes 113 are communicated with each other through a four-way connector 118, and the four-way connector 118 is connected to a pressure safety valve. The high-pressure air pipe 113 is connected with an evaporator 117, the high-pressure air pipe 113 is communicated with the evaporator 117 through a first electromagnetic valve 116, a low-pressure alarm 115 is arranged at the front end of the first electromagnetic valve 116, the evaporator 117 is communicated with the engine through a low-pressure air pipe 114, and a heating device for heating the evaporator 117 is arranged on the evaporator 117.

The gasoline pipeline 2 comprises an oil inlet pipe 24 communicated with the oil tank, the oil inlet pipe 24 is connected with a gasoline pump 21, the oil outlet of the gasoline pump 21 is communicated with the engine through a fuel oil pipe 25, a filter 22 is arranged between the oil inlet pipe 24 and the gasoline pump 21, the oil outlet of the gasoline pump 21 is connected with a second electromagnetic valve 23, the second electromagnetic valve 23 is communicated with the fuel oil pipe 25, and the second electromagnetic valve 23 is communicated with the oil tank through an oil return pipe 26.

The fuel selection control unit 3 includes a gasoline selection switch 31 and an LPG selection switch 33, the gasoline selection switch 31 is communicated with the engine ECU32, the engine ECU32 is communicated with the gasoline pump 21, the LPG selection switch 33 is communicated with the first solenoid valve 116, and the low pressure alarm 115 includes a low level indicator lamp 34 and a low level indicator switch 35 communicated with the LPG selection switch.

When LPG is used as the fuel of the generator, the LPG selection switch 33 is turned on, the first electromagnetic valve 116 is turned on through the LPG selection switch 33, the LPG fuel pipeline 11 is communicated at the moment, the LPG stored in the gas storage steel cylinder 111 enters the evaporator 117 through the high pressure gas pipe 113, the communication pipe 118, the low pressure alarm 115 and the first electromagnetic valve 116, the evaporator 117 in the embodiment has a filtering function, the liquid state of the LPG is changed into the gaseous state after entering the evaporator 117, in the evaporation process, the LPG in the evaporation process is heated by hot water led from the engine cooling system through the gasification water pipeline 12, so that the LPG is changed into the gaseous state after being evaporated, and then the LPG enters the low pressure gas pipe 114 to the engine for the work of the engine, in addition, for better man-machine interaction, the low liquid level indicator lamp 34 and the low liquid level indicator switch 35 are added, when the liquid level is lower, the low liquid level indicator lamp 34 is turned on, prompting the operator to replenish fuel in time.

When gasoline is used as fuel, the LPG selector switch 33 is closed, the gasoline selector switch 31 is opened, the engine ECU32 opens the gasoline pump 21 after receiving a signal of the gasoline selector switch 31, the second electromagnetic valve 23 is opened at the same time, the gasoline pump 21 pumps the gasoline into the engine through the second electromagnetic valve 23 and the fuel pipe 25, the filter 22 is further arranged in the gasoline pipeline, the gasoline is filtered through the filter 22, the second electromagnetic valve 23 is also communicated with the oil return pipe 26, the oil return pipe 26 is communicated with the oil tank, and when the pumped gasoline is excessive, the gasoline pump 21 is communicated with the oil return pipe 26 through the second electromagnetic valve 23, so that the excessive gasoline returns to the oil tank through the oil return pipe 26.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. A dual fuel system for an internal combustion engine, comprising an LPG fuel section (1) connected to the engine, a gasoline line (2), and a fuel selection control section (3) for opening or closing the LPG fuel section (1) and the gasoline line (2);

the LPG fuel part comprises at least one gas storage steel cylinder (111), a high-pressure gas pipe (113) is connected with a gas outlet of the gas storage steel cylinder (111), an evaporator (117) is connected with the high-pressure gas pipe (113), the evaporator (117) is communicated with an engine through a low-pressure gas pipe (114), and a heating device used for heating the evaporator (117) is arranged on the evaporator (117);

the gasoline pipeline (2) comprises an oil inlet pipe (24) communicated with the oil tank, a gasoline pump (21) is connected to the oil inlet pipe (24), and an oil outlet of the gasoline pump (21) is communicated with the engine through a fuel pipe (25).

2. The dual fuel system of the internal combustion engine as claimed in claim 1, wherein two gas storage cylinders (111) are provided, and a high pressure gas pipe (113) is connected to each of the two gas storage cylinders (111), and the high pressure gas pipe (113) is detachably connected to the gas storage cylinders (111) through a quick change connector (112).

3. The dual fuel system of claim 2, wherein the high pressure gas pipes (113) communicate with each other through a four-way joint (118), and a pressure relief valve is connected to the four-way joint (118).

4. A dual fuel system for an internal combustion engine as claimed in claim 1, characterized in that the heating device is a gasification water circuit (12), the gasification water circuit (12) comprises a heat exchange device connected with the evaporator (117), one end of the heat exchange device is communicated with the engine water jacket through a hot water pipe (121), and the other end is communicated with the engine water inlet through a circulating water pipe (122).

5. The dual fuel system of the internal combustion engine according to claim 1, characterized in that a filter (22) is arranged between the oil inlet pipe (24) and the gasoline pump (21), a second electromagnetic valve (23) is connected to an oil outlet of the gasoline pump (21), the second electromagnetic valve (23) is communicated with the fuel pipe (25), and the second electromagnetic valve (23) is communicated with a fuel tank through a fuel return pipe (26).

6. A dual fuel system for an internal combustion engine as claimed in claim 1, characterized in that the fuel selection control part (3) comprises a petrol selection switch (31), an LPG selection switch (33).

7. A dual fuel system for an internal combustion engine as claimed in claim 6, characterized in that the petrol selection switch (31) communicates with an engine ECU (32), the engine ECU (32) communicating with the petrol pump (21).

8. The dual fuel system for internal combustion engines as claimed in claim 6, characterized in that the high pressure gas line (113) communicates with the evaporator (117) through a first solenoid valve (116), the LPG selector switch (33) communicating with the first solenoid valve (116).

9. The dual fuel system of the internal combustion engine as claimed in claim 8, characterized in that a low pressure alarm (115) is arranged at the front end of the first electromagnetic valve (116), and the low pressure alarm (115) comprises a low liquid level indicator lamp (34) and a low liquid level indicator switch (35) which are communicated with the LPG selection switch.