CN108661834B - Marine double-engine double-propeller fuel backpressure valve system - Google Patents
Marine double-engine double-propeller fuel backpressure valve system Download PDFInfo
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- CN108661834B CN108661834B CN201810334045.0A CN201810334045A CN108661834B CN 108661834 B CN108661834 B CN 108661834B CN 201810334045 A CN201810334045 A CN 201810334045A CN 108661834 B CN108661834 B CN 108661834B
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- fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
- F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
- F02M37/22—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system
Abstract
The utility model provides a marine fuel backpressure valve system of duplex double-oar, connects on the fuel inlet pipe between two marine diesel engines and the fuel cabinet, and these two diesel engines are provided with oil inlet, oil-out and backpressure valve export, its characterized in that: the fuel oil back pressure valve system comprises a back pressure valve, a self-cleaning filter, a heater, a fuel oil circulating pump, a vent valve, a safety valve and a fuel pump; the back pressure valve is simultaneously connected with the two diesel engines to control the fuel oil inlet pressure of the two diesel engines, when the fuel oil inlet pressure exceeds a set pressure value, the back pressure valve automatically releases fuel oil to reduce the pressure, the fuel oil inlet pressure is maintained within the set pressure value, and the stable operation of a fuel oil system and the diesel engines is protected. The invention enables two marine diesel engines to share one set of fuel backpressure valve system, achieves the effects of reducing cost and saving space, has wide application range, and can be used for the power structure scheme of two or more diesel engines of the same ship.
Description
Technical Field
The invention relates to a diesel engine fuel system, in particular to a marine dual-engine dual-propeller fuel backpressure valve system, and belongs to the technical field of diesel engines.
Background
At present, the low-speed diesel engine for the ship is provided with a fuel oil back pressure valve. The back pressure valve realizes action through the elasticity of a built-in spring, and when the fuel inlet pressure is smaller than a set pressure value, a pipeline is blocked under the action of the elasticity of the spring so as to maintain the pressure in the pipeline; when the oil inlet pressure exceeds a set pressure value, the spring is compressed, and fuel is discharged through the backpressure valve to release the pressure. Therefore, the required pressure of the pipeline can be kept by the aid of the back pressure valve in the unstable state of the pressure in the fuel pipe, and stable operation of the diesel engine can be guaranteed.
At present, each low-speed diesel engine for ships is provided with a fuel oil back pressure valve. And the oil inlet pipe is arranged at the tail end of the fuel oil inlet main pipe and the tail end of the fuel oil return main pipe. For the situation that two diesel engines are installed on one ship, two fuel oil back pressure valves are generally needed to be installed, two sets of fuel oil systems are needed to be equipped correspondingly, higher requirements are provided for cabin space, components such as a filter, a circulating pump and a heater need to be arranged in larger space, and cost and space consumption are higher.
Disclosure of Invention
The invention aims to solve the problem of cost increase caused by the adoption of a double-engine double-propeller fuel backpressure valve system on the same ship, and provides a double-engine double-propeller fuel backpressure valve system for a ship, so that two diesel engines share one set of fuel backpressure valve system, and the effects of reducing cost and saving space are achieved.
The purpose of the invention is realized by the following technical scheme:
the utility model provides a marine fuel backpressure valve system of duplex double-oar, connects on the fuel inlet pipe between two marine diesel engines and the fuel cabinet, and these two diesel engines are provided with oil inlet, oil-out and backpressure valve export, its characterized in that: the fuel oil back pressure valve system comprises a back pressure valve, a self-cleaning filter, a heater, a fuel oil circulating pump, a vent valve, a safety valve and a fuel pump;
the back pressure valve is simultaneously connected with the two diesel engines to control the fuel oil inlet pressure of the two diesel engines, when the fuel oil inlet pressure exceeds a set pressure value, the back pressure valve automatically releases fuel oil to reduce the pressure, the fuel oil inlet pressure is maintained within the set pressure value, and the stable operation of a fuel oil system and the diesel engines is protected.
Furthermore, the self-cleaning filter, the heater and the fuel circulating pump are sequentially connected; the heater is used for heating the fuel oil entering the two diesel engines so as to reduce the viscosity of the fuel oil and improve the atomization effect of fuel oil injection; one end of the fuel pump is connected with the fuel cabinet, and the other end of the fuel pump is connected with the fuel circulating pump to provide power for the fuel circulating in the system and entering the two diesel engines; the self-cleaning filter is simultaneously connected with the oil inlets of the two diesel engines, so that fuel oil is filtered, and the cleanliness of the fuel oil is improved; the back pressure valve is used for stabilizing the fuel inlet pressure of the two diesel engines not to exceed a set pressure value and protecting a fuel system and a pipeline, and is simultaneously connected with the outlets of the back pressure valves of the two diesel engines; one end of the ventilation valve is simultaneously connected with the back pressure valve and the oil outlets of the two diesel engines, the other end of the ventilation valve is connected with the joint of the fuel pump and the fuel circulating pump, and the ventilation valve is used for ventilating fuel and discharging gas in the fuel; the safety valve is a pressure safety control device and is connected in parallel with two ends of the fuel pump to control the fuel pressure of the fuel pump not to exceed a safety value.
Further, the safety value is 4 bar.
Further, the set pressure value is 8 bar.
Furthermore, the self-cleaning filter comprises two filters and two three-way valves to form two sets of parallel filtering devices which are respectively used for normal operation and fault maintenance.
Compared with the traditional fuel oil back pressure valve system of the marine low-speed diesel engine, the fuel oil back pressure valve system has the beneficial effects that:
1) the arrangement space is small, when two diesel engines are adopted on one ship, a set of fuel backpressure valve system is shared, and the space of cabin arrangement equipment is greatly reduced.
2) The equipment cost is low because the diesel engine system adopts a set of back pressure valve equipment, the purchase quantity of parts such as back pressure valves is reduced, and the equipment cost is reduced.
3) The application range is wide, the system can be adopted for the power schemes that two diesel engines or three diesel engines and the like are adopted on the same ship, and the application range of the invention is wide.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
In the figure, 1 is a back pressure valve, 2 is a self-cleaning filter, 3 is a heater, 4 is a fuel circulating pump, 5 is a vent valve, 6 is a safety valve, 7 is a fuel pump, E1 is a first diesel engine, E2 is a second diesel engine, an X-oil inlet is formed, an F-oil outlet is formed, and K is an outlet of the back pressure valve.
Detailed Description
The following detailed description of the preferred embodiments of the present invention is provided for clear understanding of the structure and operation of the present invention, and is not intended to limit the scope of the present invention.
Referring to fig. 1, the marine dual-engine and dual-propeller fuel oil backpressure valve system is connected to a fuel oil inlet pipe between two marine diesel engines and a fuel oil cabinet, the two marine diesel engines include a first diesel engine E1 and a second diesel engine E2, and form the marine dual-engine and dual-propeller system, and the first diesel engine E1 and the second diesel engine E2 are respectively provided with an oil inlet X, an oil outlet F and a backpressure valve outlet K. The fuel oil back pressure valve system comprises a back pressure valve 1, a self-cleaning filter 2, a heater 3, a fuel oil circulating pump 4, a vent valve 5, a safety valve 6 and a fuel oil pump 7.
The fuel pump 7 is used for circulating fuel in the whole system and supplying power to the first diesel engine E1 and the second diesel engine E2, one end of the fuel pump is connected with a fuel cabinet of the cabin, and the other end of the fuel pump is connected with the fuel circulating pump 4; two valves are arranged at the front end and the rear end of the fuel pump 7 and are used for controlling the on-off of fuel.
The fuel circulating pump 4 further increases the pressure of the fuel, supplies supplementary power for the fuel to circulate in the whole system and enter the two diesel engines, and also supplies power for the system when the fuel pump 7 is maintained and overhauled. One end of the fuel circulating pump 4 is connected with the fuel pump 7, and the other end is connected with the heater 3.
The heater 3 is used for heating fuel oil entering the diesel engine to reduce the viscosity of the fuel oil and prepare for sufficient combustion, so that the fuel oil is better in atomization effect after being sprayed by the fuel injector and is more sufficiently contacted with air, higher combustion efficiency is achieved, and stable operation of the diesel engine is realized. One end of the heater 3 is connected to the fuel circulating pump 4, and the other end is connected to the self-cleaning filter 2.
The self-cleaning filter 2 filters fuel entering the first diesel engine E1 and the second diesel engine E2, removes impurities in the fuel, improves the cleanliness of the fuel, and ensures continuous and stable work of the system and the two diesel engines; the self-cleaning filter 2 comprises two filters and two three-way valves to form two sets of parallel filtering devices which are respectively used for normal operation and fault maintenance. One end of the self-cleaning filter 2 is connected with the heater 3, the other end of the self-cleaning filter is simultaneously connected with the first diesel engine E1 and the second diesel engine E2 through respective oil inlets X, and fuel oil is input into the first diesel engine E1 and the second diesel engine E2.
The back pressure valve 1 is a pressure safety control device for fuel oil inlet of the whole system, and is used for stabilizing the fuel oil inlet pressure of the two diesel engines and protecting a fuel oil system and a pipeline; when the fuel inlet pressure is smaller than the set pressure value, the back pressure valve 1 cuts off the pipeline under the action of the internal spring force to maintain the pressure in the pipeline, when the fuel inlet pressure exceeds the set pressure value, the internal spring is compressed, and the fuel is discharged through the back pressure valve 1 to release the pressure. The set pressure value of the fuel inlet pressure is generally 8bar, namely, the backpressure valve 1 controls the fuel inlet pressure of the first diesel engine E1 and the second diesel engine E2 to be below 8bar, and once the fuel inlet pressure exceeds 8bar, the backpressure valve 1 automatically releases fuel, so that a fuel system and pipelines are protected. One end of the backpressure valve 1 is simultaneously connected with the first diesel engine E1 and the second diesel engine E2 through respective backpressure valve outlets K, and the other end of the backpressure valve is connected with the ventilation valve 5.
The first diesel engine E1 and the second diesel engine E2 are simultaneously connected with the ventilation valve 5 through respective oil outlets F, return oil of the first diesel engine E1 and the second diesel engine E2 is output, and the joint of the downstream of the backpressure valve 1 and the ventilation valve 5 is the joint.
The ventilation valve 5 is used for ventilating fuel oil to ensure that no air exists in the fuel oil; the ventilation valve 5 discharges the fuel oil discharged by the back pressure valve 1 and the gas in the return oil of the diesel engine, and prevents the redundant air from damaging the components of the diesel engine in the running process of the machine. One end of the ventilation valve 5 is simultaneously connected with the backpressure valve 1 and the oil outlets F of the first diesel engine E1 and the second diesel engine E2, and the other end of the ventilation valve is connected with the joint of the fuel pump 7 and the fuel circulating pump 4.
The safety valve 6 is a pressure safety control device of the whole system and is connected in parallel with two ends of the fuel pump 7. When the pressure of the fuel pump 7 is judged to exceed 4bar, the safety valve 6 is started, partial fuel is bypassed to release the pressure, and the fuel pressure of the fuel pump 7 is controlled not to exceed 4bar, so that the safe operation of the whole system is guaranteed.
The working principle of the marine double-engine double-propeller fuel back pressure valve system is as follows:
the fuel oil is pressurized from a fuel oil cabinet of the cabin through a fuel oil pump 7, then sequentially passes through a fuel oil circulating pump 4, a heater 3 and a self-cleaning filter 2, enters a first diesel engine E1 and a second diesel engine E2 through an oil inlet X, and the two diesel engines send the rest fuel oil return oil into a back pressure valve 1 from a back pressure valve outlet K. The backpressure valve 1 is operated by the elasticity of an internal spring, when the fuel inlet pressure is lower than the set pressure, the pipeline is blocked under the action of the elasticity of the internal spring, the pressure in the pipeline is maintained, when the fuel inlet pressure exceeds the set pressure value, the spring is compressed, fuel is discharged through the backpressure valve 1, the pressure is released, the fuel inlet pressure of the two diesel engines is controlled to be 8bar, and when the fuel inlet pressure exceeds 8bar, the backpressure valve 1 automatically discharges the fuel, so that a fuel system and the pipeline are protected. The return oil of the two diesel engines is output from the oil outlet F, and is converged into the ventilation valve 5 together with the fuel oil discharged from the back pressure valve 1, so that redundant air is discharged, and no air exists in the fuel oil. The fuel oil discharged from the air vent valve 5 is gathered into the cabin fuel oil output by the fuel oil pump 7, the fuel oil pump 7 provides power for the fuel oil, and the safety valve 6 ensures that the pressure of the fuel oil pump 7 does not exceed 4 bar. The fuel oil passing through the fuel oil pump 7 and the vent valve 5 enters the fuel oil circulating pump 4 together, the pressure is further improved and the fuel oil enters the heater 3, the heater 3 heats the fuel oil, the viscosity of the fuel oil is reduced, the atomization effect of the fuel oil injector after injection is improved, the contact area with air is increased, and the combustion efficiency is improved; the heated fuel oil filters impurities in the fuel oil through the self-cleaning filter 2, the cleanliness of the fuel oil is guaranteed, normal operation of the system is guaranteed, and then the heated fuel oil enters the first diesel engine E1 and the second diesel engine E2 through the oil inlet X again. The operation of the whole fuel system is completed by the reciprocating circulation.
The specific working process of the invention is as follows:
when the first diesel engine E1 and the second diesel engine E2 operate, the fuel pump 7 is started, fuel enters the fuel circulating pump 4 from the fuel tank through pressurization, the safety valve 6 is started when the fuel pressure exceeds 4bar, and the bypass fuel discharge pressure is 4 bar; the fuel oil is further pressurized by the fuel oil circulating pump 4 and then enters the heater 3, the heater 3 heats the fuel oil, the viscosity of the fuel oil is reduced, and preparation is made for full combustion of the fuel oil; and then the fuel enters the self-cleaning filter 2 to remove impurities in the fuel and improve the purity of the fuel, then the fuel enters the first diesel engine E1 and the second diesel engine E2 through the oil inlet X, the fuel pressure of the diesel engine is stabilized through the backpressure valve 1, the bypassed fuel and the return oil output from the oil outlet F enter the ventilation valve 5 when the pressure exceeds 8bar, the bypassed fuel is converged into the fuel from the fuel cabinet after ventilation, and the bypassed fuel enters the first diesel engine E1 and the second diesel engine E2 through the fuel circulating pump 4, the heater 3 and the self-cleaning filter 2 again, so that the whole system works in a reciprocating way.
The above description is only a preferred embodiment of the present invention, and it should be noted that various equivalent modifications, changes and adaptations made by those skilled in the art according to the present application shall be considered to be the scope of the present invention.
Claims (4)
1. The utility model provides a marine fuel backpressure valve system of duplex double-oar, connects on the fuel inlet pipe between two marine diesel engines and the fuel cabinet, and these two diesel engines are provided with oil inlet, oil-out and backpressure valve export, its characterized in that: the fuel oil back pressure valve system comprises a back pressure valve, a self-cleaning filter, a heater, a fuel oil circulating pump, a vent valve, a safety valve and a fuel pump;
the back pressure valve is simultaneously connected with the two diesel engines to control the fuel inlet pressure of the two diesel engines, when the fuel inlet pressure exceeds a set pressure value, the back pressure valve automatically releases fuel to reduce the pressure, the fuel inlet pressure is maintained within the set pressure value, and the stable operation of a fuel system and the diesel engines is protected;
the self-cleaning filter, the heater and the fuel circulating pump are sequentially connected; the heater is used for heating the fuel oil entering the two diesel engines so as to reduce the viscosity of the fuel oil and improve the atomization effect of fuel oil injection; one end of the fuel pump is connected with the fuel cabinet, and the other end of the fuel pump is connected with the fuel circulating pump to provide power for the fuel circulating in the system and entering the two diesel engines; the self-cleaning filter is simultaneously connected with the oil inlets of the two diesel engines, so that fuel oil is filtered, and the cleanliness of the fuel oil is improved; the back pressure valve is used for stabilizing the fuel inlet pressure of the two diesel engines not to exceed a set pressure value and protecting a fuel system and a pipeline, and is simultaneously connected with the outlets of the back pressure valves of the two diesel engines; one end of the ventilation valve is simultaneously connected with the back pressure valve and the oil outlets of the two diesel engines, the other end of the ventilation valve is connected with the joint of the fuel pump and the fuel circulating pump, and the ventilation valve is used for ventilating fuel and discharging gas in the fuel; the safety valve is a pressure safety control device and is connected in parallel with two ends of the fuel pump to control the fuel pressure of the fuel pump not to exceed a safety value.
2. The marine twin-engine twin-propeller fuel backpressure valve system of claim 1, wherein: the safety value is 4 bar.
3. The marine twin-engine twin-propeller fuel backpressure valve system of claim 1, wherein: the set pressure value is 8 bar.
4. The marine twin-engine twin-propeller fuel backpressure valve system of claim 1, wherein: the self-cleaning filter comprises two filters and two three-way valves to form two sets of parallel filtering devices which are respectively used for normal operation and fault maintenance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810334045.0A CN108661834B (en) | 2018-04-14 | 2018-04-14 | Marine double-engine double-propeller fuel backpressure valve system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810334045.0A CN108661834B (en) | 2018-04-14 | 2018-04-14 | Marine double-engine double-propeller fuel backpressure valve system |
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| Publication Number | Publication Date |
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| CN108661834A CN108661834A (en) | 2018-10-16 |
| CN108661834B true CN108661834B (en) | 2020-05-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810334045.0A Active CN108661834B (en) | 2018-04-14 | 2018-04-14 | Marine double-engine double-propeller fuel backpressure valve system |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201963446U (en) * | 2009-07-30 | 2011-09-07 | 福特环球技术公司 | Fuel system for internal combustion engine |
| JP2013072433A (en) * | 2011-09-26 | 2013-04-22 | Hitachi Ltd | Fuel supply device |
| CN105927440A (en) * | 2016-05-26 | 2016-09-07 | 潍柴动力股份有限公司 | Diesel engine and high pressure common rail fuel injection system thereof |
-
2018
- 2018-04-14 CN CN201810334045.0A patent/CN108661834B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201963446U (en) * | 2009-07-30 | 2011-09-07 | 福特环球技术公司 | Fuel system for internal combustion engine |
| JP2013072433A (en) * | 2011-09-26 | 2013-04-22 | Hitachi Ltd | Fuel supply device |
| CN105927440A (en) * | 2016-05-26 | 2016-09-07 | 潍柴动力股份有限公司 | Diesel engine and high pressure common rail fuel injection system thereof |
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| CN108661834A (en) | 2018-10-16 |
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