阅读说明：本技术 一种矿用自卸车燃油循环系统及理论方法 (Fuel oil circulating system of mining dump truck and theoretical method ) 是由 张超 谢和平 弓丁丁 李海 王志行 戴振环 鹿飞 张珂 时维方 陈楚东 于 2020-11-06 设计创作，主要内容包括：本发明涉及矿用机械技术领域,涉及一种矿用自卸车燃油循环系统及理论方法。该燃油循环系统自燃油箱起,通过进油管依次进入油水分离器、燃油滤清器、发动机,从发动机出来的燃油通过回油管依次进入温度控制单元、燃油散热器,再经过球阀返回到燃油箱或经过球阀返回到燃油管中。本发明提高回油管路中燃油清洁率,延长燃油滤清器滤芯的寿命,在适宜的温度下喷油量充足,燃油分子热运动剧烈,提高喷油器喷油后的雾化和蒸发性能,使燃油得到更充分的燃烧,降低油耗,有效地减少了碳粒和黑烟的形成,提高了车辆使用经济性。(The invention relates to the technical field of mining machinery, in particular to a fuel oil circulating system of a mining dump truck and a theoretical method. The fuel oil circulating system starts from a self-ignition oil tank, sequentially enters an oil-water separator, a fuel oil filter and an engine through an oil inlet pipe, and fuel oil from the engine sequentially enters a temperature control unit and a fuel oil radiator through an oil return pipe, and then returns to the fuel tank through a ball valve or returns to the fuel oil pipe through the ball valve. The invention improves the cleaning rate of fuel oil in an oil return pipeline, prolongs the service life of a filter element of a fuel oil filter, has sufficient fuel injection quantity and violent thermal motion of fuel oil molecules at proper temperature, improves the atomization and evaporation performance of an oil injector after oil injection, enables the fuel oil to be more fully combusted, reduces the oil consumption, effectively reduces the formation of carbon granules and black smoke, and improves the use economy of vehicles.)

1. A mining dump truck fuel oil circulating system is characterized in that: the fuel oil self-ignition fuel tank (1) starts, enters the oil-water separator (3), the fuel oil filter and the engine (5) in sequence through an oil inlet pipe, and then the fuel oil coming out of the engine (5) enters the temperature control unit (10) through the oil return pipe and returns to the fuel tank (1) through the ball valve (15) or returns to the fuel oil pipe (4) through the ball valve (19).

2. The mining dump truck fuel circulation system according to claim 1, characterized in that: when the engine (5) is started to idle, fuel oil sequentially passes through the oil-water separator (3), the fuel oil filter, the engine (5) and the temperature control unit (10) in a pipeline, and returns to the fuel tank (1) through the oil return pipe (17), the oil return pipe (14) and the ball valve (15) after the temperature judgment is carried out in the temperature control unit (10) until the set temperature t is not less than the test temperature t 1.

3. The mining dump truck fuel circulation system according to claim 1, characterized in that: when the fuel temperature of the engine (5) is in a low-temperature state, the fuel sequentially passes through the oil-water separator (3), the fuel filter, the engine (5) and the temperature control unit (10) in a pipeline, and returns to the oil inlet pipe (4) through the oil return pipe (17), the oil return pipe (18) and the ball valve (19) after the temperature judgment is carried out in the temperature control unit (10) until the set temperature t is not lower than the test temperature t 1.

4. The mining dump truck fuel circulation system according to claim 1, characterized in that: when the fuel temperature of the engine (5) is in a high-temperature state, the fuel sequentially passes through the oil-water separator, the fuel filter, the engine and the temperature controller in a pipeline, and returns to the fuel inlet pipe (4) through the oil return pipe (11), the fuel radiator (12), the oil return pipe (13), the oil return pipe (18) and the ball valve (19) after the temperature judgment setting temperature t is smaller than the test temperature t1 in the temperature control unit (10).

5. The mining dump truck fuel circulation system according to any one of claims 1 to 4, characterized in that: the temperature control unit (10) comprises a control valve monitoring control unit, a fuel temperature monitor and a control valve, wherein the control valve monitoring control unit and the fuel temperature monitor respectively monitor the opening and closing state of the control valve and the fuel temperature and jointly control the operation of the whole system; the control valve monitoring control unit is only responsible for monitoring and controlling the opening and closing states of the valve; the fuel temperature monitor sets a specific cooling system working temperature critical value t.

6. A fuel circulation theoretical method of a mining dump truck is characterized by comprising the following steps: the mining dump truck fuel circulation system as defined in any one of claims 1 to 5 is adopted.

Technical Field

The invention relates to the technical field of mining machinery, in particular to a fuel oil circulating system of a mining dump truck and a theoretical method.

Background

The fuel supply system is an important component of a power system of the dump truck, is a power source of the engine, can continuously and stably provide fuel for normal operation of the engine, and is directly related to the reliability and the working efficiency of the dump truck. The fuel system is used to provide the engine with fuel in an appropriate amount, pressure, temperature and cleanliness during engine operation.

Under the action of the pressure of a fuel pump, fuel in an engine fuel system is pumped into an oil-water separator from a fuel tank through an oil inlet pipeline, and enters an engine fuel fine filter after water and large-particle impurities are separated in the oil-water separator; the fuel oil with small particles filtered enters the left fuel oil main pipe and the right fuel oil main pipe of the engine respectively and then enters each fuel injection pump and each fuel injector to provide fuel for each cylinder of the engine. The rest fuel oil is converged by the left and right fuel oil pipelines of the engine and then flows back to the fuel oil tank through the oil return pipe. However, such a fuel system has the following problems: the mining dump truck has a large vehicle type and long fuel oil pipelines, so that the resistance of fuel oil in the pipelines is large and easily exceeds the specified fuel oil resistance limit value of an engine; because the fuel oil in the fuel tank contains impurities, the fuel oil returns to the fuel tank after circulating once, so the fuel oil containing the impurities can be sucked from the fuel tank again during circulating every time, and if the impurities in the fuel oil are too much, the service lives of filter elements of an oil-water separator and a filter can be shortened; the fuel pipeline has no temperature control function, the fuel temperature is easy to be overhigh, the density is reduced, the fuel injection quality is reduced, and the power of the engine is reduced.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: an oil-water separator, a fuel filter, a temperature control unit, a fuel radiator and a ball valve are arranged in the fuel system.

The invention provides a fuel oil circulating system of a mining dump truck, wherein fuel oil is self-combusted from an oil tank and sequentially enters an oil-water separator, a fuel oil filter and an engine through an oil inlet pipe, the fuel oil from the engine enters a temperature control unit through an oil return pipe, and then returns to the oil tank through a ball valve or returns to a fuel oil pipe through the ball valve.

Further, when the engine is started to idle, fuel oil sequentially passes through the oil-water separator, the fuel oil filter, the engine and the temperature control unit in a pipeline, and returns to the fuel oil tank through the ball valve after the temperature judgment is carried out in the temperature control unit, wherein the set temperature t is not less than the test temperature t 1.

Further, when the temperature of the fuel oil of the engine is in a low-temperature state, the fuel oil sequentially passes through the oil-water separator, the fuel oil filter, the engine and the temperature control unit in the pipeline, and returns to the fuel oil pipe through the oil return pipe and the ball valve after the temperature judgment setting temperature t is larger than or equal to the test temperature t1 in the temperature control unit.

Further, when the temperature of the fuel oil of the engine is in a high-temperature state, the fuel oil sequentially passes through the oil-water separator, the fuel oil filter, the engine and the temperature controller in a pipeline, and returns to the fuel oil pipe through the oil return pipe, the fuel oil radiator and the ball valve after the temperature judgment setting temperature t is smaller than the test temperature t1 in the temperature control unit.

Furthermore, the temperature control unit comprises a control valve monitoring control unit, a fuel temperature monitor and a control valve, wherein the control valve monitoring control unit and the fuel temperature monitor respectively monitor the opening and closing state of the control valve and the fuel temperature and jointly control the operation of the whole system; the control valve monitoring control unit is only responsible for monitoring and controlling the opening and closing states of the valve; the fuel temperature monitor sets a specific cooling system working temperature critical value t.

The invention provides a theoretical method for fuel circulation of a mining dump truck in a second aspect, and the mining dump truck fuel circulation system is adopted.

The invention has the advantages that: the trend of fuel in the pipeline is changed by controlling the opening and closing of the ball valve, so that the fuel in the pipeline does not return to the fuel tank, and the fuel is supplemented with the fuel from the fuel tank to realize the fuel return circulation, thereby reducing the return resistance in the pipeline, achieving the specified fuel quantity of the engine in the pipeline and saving the energy consumption of a fuel pump of the engine; the cleaning rate of fuel in the oil return pipeline is improved, and the service life of a filter element of a fuel filter is prolonged; when the fuel temperature is too high, the fuel density is reduced, the temperature control unit controls the temperature and the trend of the fuel in the pipeline at the moment, redundant heat is dissipated through the fuel radiator, the proper injection temperature is reached, and the density is increased. The invention ensures that the system has sufficient fuel injection quantity at proper temperature and violent thermal motion of fuel molecules, improves the atomization and evaporation performance of the fuel injector after fuel injection, ensures that the fuel is more fully combusted, reduces the fuel consumption, effectively reduces the formation of carbon granules and black smoke, and improves the use economy of vehicles.

Drawings

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

FIG. 2 is a schematic diagram of fuel flow during an engine start-up condition;

FIG. 3 is a schematic view of fuel flow direction in a low temperature state of fuel;

FIG. 4 is a schematic view of the fuel flow direction during a high temperature fuel condition;

FIG. 5 is a schematic structural diagram of an embodiment of the present invention;

FIG. 1 shows a fuel tank; 2. an oil inlet pipe; 3. an oil-water separator; 4. an oil inlet pipe; 5. an engine; 5.1, a low-pressure oil pump with a pressure release valve; 5.2, a high-pressure oil pump; 5.3, side A oil sprayer; 5.4, a side B oil sprayer; 5.5, a high-pressure oil pump; 5.6, a low-pressure oil pump with a pressure release valve; 5.7, a secondary fuel filter; 5.8, a manual oil pump; 5.9, a joint; 5.10, a joint; 5.11, a joint; 6. an oil inlet pipe; 7. a primary fuel filter; 8. an oil inlet pipe; 9. an oil return pipe; 10. a temperature control unit; 11. an oil return pipe; 12. a fuel oil radiator; 13. an oil return pipe; 14. an oil return pipe; 15. a ball valve; 16. an oil return pipe; 17. an oil return pipe; 18. an oil return pipe; 19. a ball valve; 101. a fuel tank; 102. a ball valve; 103. an oil inlet pipe; 104. an oil return pipe; 105. an engine; 106. an oil-water separator; 107. a ball valve; 108. an oil inlet pipe; 109. a three-way joint; 110. an oil inlet pipe; 111. an oil inlet pipe; 112. a three-way joint; 113. an oil return pipe; 114. an oil return pipe; 115. an oil return pipe; 116. an oil return pipe; 117. a temperature control unit; 118. a pipe clamp; 119. a three-way joint; 120. a primary fuel filter; 121. an oil return pipe; 122. a fuel oil radiator.

Detailed Description

In order to make the implementation objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the accompanying drawings in the embodiments of the present invention.

As shown in fig. 1, the principle of the present invention is schematically illustrated. The cooling device of the fuel system of the dump truck comprises a fuel tank 1, an oil-water separator 3, a ball valve 15, a ball valve 19, a fuel radiator 12, a temperature control unit 10, an engine 5, a primary fuel filter 7, an oil inlet pipe 2, an oil inlet pipe 4, an oil inlet pipe 6, an oil inlet pipe 8, an oil return pipe 9, an oil return pipe 10, an oil return pipe 11, an oil return pipe 13, an oil return pipe 14, an oil return pipe 16, an oil return pipe 17 and an oil return pipe 18; the fuel tank 1 is a device for storing fuel oil and is respectively connected with an oil inlet pipe 2 and an oil return pipe 16 through an oil inlet and an oil return opening; the oil-water separator 3 and the primary fuel filter 7 are respectively connected with an engine oil inlet joint 5.11, a joint 5.10 and a joint 5.9 through an oil inlet pipe 4, an oil inlet pipe 6 and an oil inlet pipe 8, so that water and large particle impurities in a fuel system can be filtered, and the cleanliness of fuel oil is improved; the ball valves 15 and 19 control the direction of fuel in the oil return pipe 14, the oil return pipe 16 and the oil return pipe 18 through opening and closing; the fuel radiator 12 is arranged in front of the engine radiator through a bracket, and the air quantity generated by an engine fan takes away the heat in the fuel radiator to achieve the purpose of reducing the fuel temperature; the temperature control unit 10 comprises a control valve monitoring control unit, a fuel temperature monitor and a control valve, wherein the control valve monitoring control unit and the fuel temperature monitor respectively monitor the opening and closing state of the control valve and the fuel temperature and jointly control the operation of the whole system; the control valve monitoring control unit is only responsible for monitoring and controlling the opening and closing state of the valve; setting a specific cooling system working temperature critical value t by a fuel temperature monitor; the engine fuel system includes: the engine comprises a low-pressure oil pump 5.1 with a pressure release valve, a low-pressure oil pump 5.6 with a pressure release valve, a high-pressure oil pump 5.2, a high-pressure oil pump 5.5, an A-side oil sprayer 5.3, a B-side oil sprayer 5.4, a secondary fuel filter 5.7, a manual oil pump 5.8, a fuel joint 5.9, a joint 5.10 and a joint 5.11, wherein the manual oil pump 5.8 is used for manually pumping oil to remove air in a pipeline before the engine is started.

As shown in fig. 2, which is a schematic view of fuel trend when an engine is started to be in an idle state, a fuel tank 1, an oil inlet pipe 2, an oil inlet pipe 4, an oil inlet pipe 6, an oil inlet pipe 8, an engine 5, an oil return pipe 9, an oil return pipe 17, an oil return pipe 14 and an oil return pipe 16 form a circulating body; at this time, the ball valve 15 is in an open state, and the ball valve 19 is in a closed state; after moisture and large-particle impurities of fuel oil are removed from the fuel oil tank 1 through the oil-water separator 2, the fuel oil respectively enters a low-pressure oil pump 5.1 with a pressure release valve and a low-pressure oil pump 5.6 with the pressure release valve through an engine fuel oil connector 5.11 to pump the fuel oil; after being pressurized for the first time, the fuel enters the primary fuel filter 7 through the fuel joint 5.10 and the oil inlet pipe 6, and small particle impurities are removed under the action of the primary fuel filter 7; after bypassing the manual oil pump 5.8 through the fuel joint 5.9 and the oil inlet pipe 8, after removing small impurity particles through the secondary fuel filter 5.7, the fuel reaches the injection pressure after being pressurized by the high-pressure oil pump 5.2 and the high-pressure oil pump 5.5, and a part of the fuel is injected into the cylinder through the A-side oil injector 5.3 and the B-side oil injector 5.4 and atomized into particles. The residual fuel enters the temperature control unit 10 through the fuel return pipe 9, a temperature tester in the temperature control unit senses the temperature t1 of the fuel, the set temperature t is not less than the test temperature t1, the fuel return pipe 11 is closed, and the fuel return pipe 17 is opened; since the ball valve 15 is in an open state and the ball valve 19 is in a closed state, the fuel returns to the fuel tank through the fuel return pipe 14 and the fuel return pipe 16. Therefore, in the state of starting the engine at idle speed, fuel oil circulates between the engine and the fuel tank through the oil inlet pipeline and the oil return pipe, the duration time of the circulating state is short, and the fuel oil resistance loss is small in the process of returning the fuel oil to the fuel tank; and the impurity that inhales from the fuel tank is less, and impurity also gets into the pipeline along with the fuel, to oil water separator and fuel filter core's life, has hardly influenced.

As shown in fig. 3, the fuel trend is schematically shown when the fuel is in a low-temperature state, and a fuel tank 1, an oil inlet pipe 2, an oil inlet pipe 4, an oil inlet pipe 6, an oil inlet pipe 8, an engine 5, an oil return pipe 9, an oil return pipe 17 and an oil return pipe 18 form a circulating body; at this time, the ball valve 15 is in a closed state, and the ball valve 19 is in an open state; after moisture and large-particle impurities of fuel oil are removed from the fuel oil tank 1 through the oil-water separator 2, the fuel oil respectively enters a low-pressure oil pump 5.1 with a pressure release valve and a low-pressure oil pump 5.6 with the pressure release valve through an engine fuel oil connector 5.11 to pump the fuel oil; after being pressurized for the first time, the fuel enters the primary fuel filter 7 through the fuel joint 5.10 and the oil inlet pipe 6, and small particle impurities are removed under the action of the primary fuel filter 7; after bypassing the manual oil pump 5.8 through the fuel joint 5.9 and the oil inlet pipe 8, after removing small impurity particles through the secondary fuel filter 5.8, the fuel reaches the injection pressure after being pressurized by the high-pressure oil pump 5.2 and the high-pressure oil pump 5.5, and a part of the fuel is injected into the cylinder through the A-side oil injector 5.3 and the B-side oil injector 5.4 and atomized into particles. The rest fuel enters the temperature control unit 10 through the fuel return pipe 9, a temperature tester in the temperature control unit senses the temperature t1 of the fuel, the set temperature t is not less than the test temperature t1, the fuel return pipe 11 is closed, and the fuel return pipe 17 is opened; since the ball valve 15 is closed and the ball valve 19 is open, the fuel is not returned to the fuel tank through the return pipes 14 and 16, but is returned to the fuel inlet pipe 4 through the ball valve 19. Therefore, in the low-temperature state of the fuel, the fuel circulates between the engine and the fuel tank through the fuel inlet pipeline and the fuel return pipe, the fuel in the circulating state does not return to the fuel tank, the flowing distance of the fuel in the pipeline is reduced after the fuel returns to the fuel inlet pipe 4 through the ball valve 19, the oil return resistance in the fuel pipeline is reduced, the engine is facilitated to pump the fuel, the fuel consumption of the engine is saved, the fuel does not return to the fuel tank after passing through the engine but returns to the fuel inlet pipeline, the content of impurities in the fuel pipeline is reduced, the service lives of a filter element in an oil-water separator and a filter are prolonged, and the replacement frequency is reduced.

As shown in fig. 4, the fuel trend is schematically shown when the fuel is in a high-temperature state, and a fuel tank 1, an oil inlet pipe 2, an oil inlet pipe 4, an oil inlet pipe 6, an oil inlet pipe 8, an engine 5, a fuel radiator 12, an oil return pipe 9, an oil return pipe 17 and an oil return pipe 18 form a circulating body; at this time, the ball valve 15 is in a closed state, and the ball valve 19 is in an open state; after moisture and large-particle impurities of fuel oil are removed from the fuel oil tank 1 through the oil-water separator 2, the fuel oil respectively enters a low-pressure oil pump 5.1 with a pressure release valve and a low-pressure oil pump 5.6 with the pressure release valve through an engine fuel oil connector 5.11 to pump the fuel oil; after being pressurized for the first time, the fuel enters the primary fuel filter 7 through the fuel joint 5.10 and the fuel pipe 6, and small particle impurities are removed under the action of the primary fuel filter 7; after bypassing the manual oil pump 5.8 through the fuel joint 5.9 and the oil inlet pipe 8, after removing small impurity particles through the secondary fuel filter 5.8, the fuel reaches the injection pressure after being pressurized by the high-pressure oil pump 5.2 and the high-pressure oil pump 5.5, and a part of the fuel is injected into the cylinder through the A-side oil injector 5.3 and the B-side oil injector 5.4 and atomized into particles. The rest fuel enters the temperature control unit 10 through the fuel pipeline 9, a temperature tester in the temperature control unit senses the fuel temperature t1, the set temperature t is less than the test temperature t1, the oil return pipe 11 is opened, the oil return pipe 17 is closed under the action of the temperature control unit 10, and the fuel is radiated through the radiator 12; since the ball valve 15 is closed and the ball valve 19 is open, the fuel is not returned to the fuel tank through the return pipe 14 and the return pipe 16, but is returned to the fuel inlet pipe 4 through the return pipe 13, the return pipe 18 and the ball valve 19. Under the high-temperature state, the fuel oil circulates between the engine and the fuel tank through the oil inlet pipeline, the oil return pipe and the fuel oil radiator; in the process of the circulation state, after the redundant heat emitted by the fuel oil through the radiator 12 reaches the proper temperature, the fuel oil does not return to the fuel oil tank 1 and returns to the oil inlet pipe 4 through the ball valve 19, so that the oil return resistance in a fuel oil pipeline can be reduced, the oil pumping of an engine is facilitated, and the oil consumption of the engine is saved; the excessive heat is dissipated through the fuel oil radiator to reach the proper jetting temperature and the density is raised. Therefore, the fuel injection quantity is sufficient at a proper temperature, the thermal motion of fuel molecules is violent, the atomization and evaporation performances of the fuel injector after fuel injection can be improved, the fuel can be more fully combusted, the fuel consumption is reduced, the formation of carbon granules and black smoke is effectively reduced, and the use economy of the vehicle is improved.

As shown in fig. 5, the fuel system of the mining dump truck according to a specific embodiment of the present invention includes a fuel tank 101, a ball valve 102, an oil inlet pipe 103, an oil return pipe 104, an engine 105, an oil-water separator 106, a ball valve 107, an oil inlet pipe 108, a three-way joint 109, an oil inlet pipe 110, an oil inlet pipe 111, a three-way joint 112, oil return pipes 113, 114, 115, 116, and 121, a temperature control unit 117, a pipe clamp 118, a three-way joint 119, a primary fuel filter 120, and a fuel radiator 122.

In order to conveniently arrange the direction of pipelines and compensate processing and assembly errors in a limited space, the oil inlet and return pipelines are connected by adopting a hose, and the oil inlet and return pipelines are fixed by adopting a pipe clamp 118; the ball valve 102 and the ball valve 107 are simple and reliable in structure, manual control is adopted to ensure the trend of oil inlet and return, and the ball valve 102 is connected with the fuel tank 101 and the oil return pipe 104; the left side of the ball valve 107 is connected with the oil-water separator 106 and the oil inlet pipe 108 through a three-way joint 119, and the right side is connected with the oil inlet pipe 121 and the oil return pipe 104 through a three-way joint 109; when the ball valve 102 is opened and the ball valve 107 is closed, the fuel is controlled to return to the fuel tank 101 through the fuel return pipe 104; when the ball valve 102 is closed and the ball valve 107 is opened, the fuel returns to the oil inlet pipe 108 through the oil return pipe 118; the left side of the oil-water separator 106 is connected with an oil inlet pipe 103, and the right side is connected with an oil return pipeline 104 and an oil inlet pipe 118 through a three-way joint 119; the engine 105 is connected with the oil-water separator 106 through an oil inlet pipe 108, and is connected with the primary fuel filter 120 through oil inlet pipes 110 and 111; the fuel radiator 122 is connected with the oil return pipeline 114 and the oil return pipe 115; the temperature control unit 117 is connected to the return pipes 113, 115, 116.

The foregoing is illustrative of the present invention and its embodiments, and the description is not limiting. The embodiment shown in the drawings is only one embodiment of the present invention, and the actual structure is not limited thereto. Therefore, without departing from the spirit of the present invention, a person skilled in the art shall appreciate that the present invention shall not be limited to the embodiments shown in the drawings.