CN113356963A - Explosion-proof method and device for crankcase of gas fuel internal combustion engine - Google Patents
Explosion-proof method and device for crankcase of gas fuel internal combustion engine Download PDFInfo
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- CN113356963A CN113356963A CN202110738353.1A CN202110738353A CN113356963A CN 113356963 A CN113356963 A CN 113356963A CN 202110738353 A CN202110738353 A CN 202110738353A CN 113356963 A CN113356963 A CN 113356963A
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- 239000000446 fuel Substances 0.000 title claims abstract description 45
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 36
- 239000007789 gas Substances 0.000 claims abstract description 173
- 238000001514 detection method Methods 0.000 claims abstract description 118
- 239000011261 inert gas Substances 0.000 claims abstract description 22
- 238000004880 explosion Methods 0.000 claims abstract description 21
- 238000010926 purge Methods 0.000 claims description 16
- 238000003384 imaging method Methods 0.000 claims description 10
- 230000002265 prevention Effects 0.000 claims 3
- 230000001629 suppression Effects 0.000 claims 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 32
- 230000008569 process Effects 0.000 description 11
- 239000003921 oil Substances 0.000 description 10
- 229910052739 hydrogen Inorganic materials 0.000 description 7
- 239000001257 hydrogen Substances 0.000 description 7
- 239000010687 lubricating oil Substances 0.000 description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 230000001360 synchronised effect Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000004200 deflagration Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000011897 real-time detection Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 150000002431 hydrogen Chemical class 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000010705 motor oil Substances 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- -1 for example Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 230000009466 transformation Effects 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M13/00—Crankcase ventilating or breathing
- F01M13/0011—Breather valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M13/00—Crankcase ventilating or breathing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B77/00—Component parts, details or accessories, not otherwise provided for
- F02B77/08—Safety, indicating, or supervising devices
- F02B77/10—Safety means relating to crankcase explosions
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/04—Introducing corrections for particular operating conditions
- F02D41/042—Introducing corrections for particular operating conditions for stopping the engine
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M13/00—Crankcase ventilating or breathing
- F01M2013/0077—Engine parameters used for crankcase breather systems
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention relates to an explosion-proof method and device of a crankcase of a gas fuel internal combustion engine, the method comprises the steps of arranging a detection module on the outer wall of the crankcase, connecting the detection module with a detection hole preset on the wall of the crankcase through a connector, forming a closed cavity with the same gas concentration in an inner cavity and the crankcase, and detecting the gas concentration in the inner cavity of the detection module to obtain the gas concentration in the crankcase; comparing the detection result with a preset reference value, and judging whether the concentration is too high; when the concentration value is too high, the working state of the gas fuel internal combustion engine is protected, when the engine is in the running state, the engine is prohibited from running, then inert gas is introduced into the crankcase, the concentration of combustible gas is reduced, and explosion is prevented; or when the engine is in a stop state, the inert gas is firstly introduced into the crankcase, then the engine is forbidden to be started, and the concentration of the gas in the crankcase is reduced, so that the combustible gas concentration is timely found and reduced, the explosion is avoided, and the safety of the engine is protected.
Description
Technical Field
The application relates to the technical field of gas fuel internal combustion engines, in particular to an explosion-proof method and device for a crankcase of a gas fuel internal combustion engine.
Background
In the prior art, a gas fuel internal combustion engine can use combustible gases such as methane, carbon monoxide and hydrogen as fuel to be mixed with air and then combusted in a combustion chamber, wherein the combustion chamber consists of a piston, a piston ring, a cylinder sleeve and a cylinder cover; in practical application, a gap is formed between the piston assembly and the inner wall of the cylinder sleeve, a blow-by phenomenon that gas in a combustion chamber passes through the gap and enters an engine crankcase inevitably exists, along with the continuous increase of the running time of an engine, the gap between the piston assembly and the inner wall of the cylinder sleeve is gradually increased, the amount of combustible mixture gas entering the engine crankcase is increased, when the concentration of the combustible mixture gas entering the crankcase is increased to reach a combustible condition, explosion caused by deflagration can occur in the crankcase, and the safe running of the engine is seriously influenced.
In the prior art, when high-pressure airflow and high-temperature flame are generated and released due to explosion in a crankcase, an explosion-proof valve can be used for weakening the pressure and extinguishing the flame in the explosion-proof valve; as is known in the art, crankcase explosion-proof valves have special features: the method has the advantages that the risk that the explosion pressure in the crankcase cannot be released due to failure exists, an operator is required to search for the problems of the explosion-proof valves for maintenance, materials capable of keeping the effective physical and mechanical properties of the explosion-proof valves at high temperature are selected, and 1 or more explosion-proof valves are arranged on the crankcase after the volume of the crankcase is calculated;
it is thus seen that there is a great need for an easy to implement, simple and effective method and apparatus for preventing the explosion of combustible gases which may be allowed to escape into the crankcase of an engine, and for protecting the safe operation of a gaseous fuel internal combustion engine.
Disclosure of Invention
In order to solve the problems that in the prior art, the concentration of combustible gas cannot be found in time to cause the concentration of the combustible gas to rise continuously when the combustible gas enters the crankcase, explosion is caused by deflagration in the crankcase when the combustible gas reaches a combustible condition, and the safe operation of an engine is seriously influenced, the embodiment of the application provides an explosion-proof method and a device for the crankcase of a gas fuel internal combustion engine, which are used for judging the concentration of the combustible gas in the crankcase of the gas fuel internal combustion engine in time, preventing the concentration of the combustible gas which enters the crankcase from rising to reach the combustible condition to cause deflagration, preventing the crankcase from exploding, and ensuring the safe operation of the gas fuel reciprocating type internal combustion engine.
In a first aspect, an explosion-proof method for a crankcase of a gaseous fuel internal combustion engine provided by an embodiment of the application comprises the following steps:
detecting a real-time concentration value of combustible gas in a crankcase through a detection module preset on the crankcase;
comparing the real-time concentration value with a preset protection reference value, and judging whether the real-time concentration value is higher than the protection reference value;
when the real-time concentration value is higher than the protection reference value, detecting the working state of an engine;
if the engine is in a running state, the engine is forbidden to run, and then inert gas is filled into the crankcase through a preset pipeline;
if the engine is in a stop state, inert gas is introduced into the crankcase through a preset pipeline, and then the engine is prohibited from starting.
Further, the prohibiting engine starting includes:
controlling an ignition controller of the engine to stop ignition;
a gas controller for controlling the engine closes the intake gas control valve.
In a second aspect, embodiments of the present application provide a gaseous fuel internal combustion engine crankcase explosion-proof device, including:
the device comprises a detection module, a protection control device and a purging device;
the detection module is arranged on the outer wall of the crankcase, and an internal cavity of the detection module is communicated with the inside of the crankcase through a detection hole preset on the crankcase, receives combustible gas entering from the inside of the crankcase and discharges the combustible gas into the crankcase;
the detection module is used for detecting the real-time concentration value of the combustible gas in the internal cavity;
the protection control device is connected with the detection module and used for receiving and storing the detection result of the detection module;
the protection control device is also connected with the engine and used for detecting the working state of the engine; the working state comprises a stop state and a running state;
the protection control device is also connected with the purging device and is used for prohibiting the engine from running firstly and then introducing inert gas into the crankcase through the purging device when the detected real-time concentration value is higher than the protection standard value and the engine is in a running state; or when the detected real-time concentration value is higher than the protecting standard value and the engine is in a stop state, firstly introducing inert gas into the crankcase through the purging device and then forbidding the engine to start.
Further, the detection hole comprises a first detection hole and a second detection hole;
the aperture axis of the first detection hole is parallel to the horizontal plane of the engine body;
and a preset angle inclining to the oil pan exists between the aperture axis of the second detection hole and the horizontal plane of the engine body.
Further, in the above-mentioned case,
the protection controller is connected with the engine ignition controller and is used for controlling the ignition controller of the engine not to ignite and forbidding the engine to start when the concentration of the combustible gas in the crankcase is detected to be greater than or equal to the protection reference value; (ii) a
And the protection controller is connected with the engine gas controller and is used for controlling the gas controller to close the gas inlet control valve and forbidding the engine to start when the concentration of the combustible gas in the crankcase is detected to be greater than or equal to the protection reference value.
Further, the device also comprises an imaging display device;
the imaging display device is connected with the protection control device and is used for displaying the data information in the protection control device.
According to the explosion-proof method for the crankcase of the gas fuel internal combustion engine, the detection module is arranged on the outer wall of the crankcase, the inner cavity of the detection module is connected with the detection hole preset in the wall of the crankcase through the interface, the inner cavity and the inner part of the crankcase form a closed cavity, and the concentration of combustible gas in the crankcase is obtained by detecting the concentration of the combustible gas in the detection module; and comparing the detected concentration value of the combustible gas with a preset protection reference value, and judging whether the concentration of the combustible gas is too high. Therefore, the concentration of the combustible gas in the crankcase can be detected in real time, when the concentration value is higher than a preset value, a protective measure is taken for the working state of the gas fuel internal combustion engine, for example, when the engine is in the running state, the engine is prohibited from running, the concentration cannot be increased continuously, and then inert gas is introduced into the crankcase, so that the concentration of the combustible gas in the crankcase is reduced, and the safety of the engine is ensured; or when the engine is in a stop state, firstly introducing inert gas into the crankcase to reduce the concentration of combustible gas in the crankcase, then forbidding the engine to start, preventing the subsequent engine from starting to cause overhigh concentration of the combustible gas, realizing the real-time detection of the concentration of the combustible gas in the crankcase, and when the concentration is overhigh, timely reducing the concentration of the combustible gas, and forbidding the engine to operate, preventing the occurrence of dangers such as explosion and the like, and ensuring the safety of the engine.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic flow chart of a crankcase explosion-proof method for a gaseous fuel internal combustion engine provided by an embodiment of the application;
FIG. 2 is a schematic flow chart of a method for explosion protection of a gaseous fuel internal combustion engine crankcase provided in another embodiment of the present application;
FIG. 3 is a schematic structural diagram of an explosion-proof device of a crankcase of a gaseous fuel internal combustion engine provided by an embodiment of the application.
1-engine body, 2-crankcase, 3-detection module, 3 a-closed chamber, 4-purging gas interface, 5-detection element, 6-combustion chamber, 7-spark plug, 8-gas supply pipe, 9-gas control valve, 10-cylinder liner cooling water cavity, 11-cylinder liner, 12-piston, 13-connecting rod, 14-oil pan, 15-connecting rod bearing, 16-crankshaft, K1-protection control device, K2-graphical display device, K3-ignition controller and K4-gas controller.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail below. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without making any creative effort, shall fall within the protection scope of the present application.
Example (b):
fig. 1 is a schematic flow chart of a crankcase explosion-proof method of a gaseous fuel internal combustion engine provided by an embodiment of the present application, and as shown in fig. 1, the crankcase explosion-proof method of the gaseous fuel internal combustion engine provided by the embodiment of the present application includes:
s101, detecting a real-time concentration value of combustible gas in a crankcase through a detection module preset on the crankcase;
it is specific, set up two crankcase detecting holes that run through the crankcase inside and outside on gaseous fuel internal combustion engine organism, outside at detecting hole sets up the detection module, after installing detection component on the detection module, detect a airtight cavity of constitution of module inner space and the inside intercommunication of engine crankcase, it is synchronous the same with the interior gas component of crankcase in real time to detect the interior gas component of module airtight cavity like this, through detecting the airtight strong indoor gas component of detection module, just can obtain the gas component in the crankcase, thereby on the basis of reducing the engine transformation, realize the gas component in the real-time accurate detection crankcase.
In practical application, two crankcase detecting holes penetrating through the inside and the outside of the crankcase, namely a first detecting hole and a second detecting hole are arranged on an engine body in the upper space of the lubricating oil liquid level in an engine oil pan, the two holes are arranged up and down, the aperture axis of the first detecting hole of the upper crankcase is parallel to the horizontal plane of the engine body, and the aperture axis of the second detecting hole of the lower crankcase and the horizontal plane of the engine body have an inclined angle towards the oil pan.
The detection module is arranged on the machine body outside the detection hole, a cavity is arranged in the detection module, and an interface is communicated with the inside and the outside of the cavity; the interface is connected with detecting the hole, and is corresponding, and the interface also includes first interface and second interface, and first interface and the first detection hole intercommunication on the crankcase, second interface and crankcase second detection hole intercommunication.
Furthermore, the first interface is horizontally connected with the first detection hole, the second interface and the horizontal plane of the machine body have an inclined angle towards the oil pan, and the angle of the second interface is the same as that of the second detection hole; after the detection element is installed on the detection module, a closed cavity communicated with the interior of the crankcase of the engine is formed, gas components in the closed cavity are synchronous and the same with gas components in the crankcase in real time, the gas components stirred by the rotation of the crankshaft in the running process of the engine can circularly enter the closed cavity of the detection module to be detected by the detection module, and the gas components in the closed cavity of the detection module are measured to obtain component data of gas in the crankcase.
It should be noted that the detecting element may be set according to the component type of the gas fuel, for example, different detecting elements may be set according to actual requirements for different combustible gases, and different detecting elements may be set in the detecting module or different detecting elements may be replaced to detect the concentration of different combustible gases, so that the explosion-proof method and apparatus for a crankcase of a gas fuel internal combustion engine provided by the present application may be applied to internal combustion engines with different gas fuels, and the application range may be increased.
S102, comparing the real-time concentration value with a preset protection reference value, and judging whether the real-time concentration value is higher than the protection reference value;
specifically, the preset protection control device is connected with the detection module and used for receiving the real-time concentration value of the combustible gas in the crankcase, which is detected by the detection module. The detection element monitors the concentration value of combustible gas in gas components in the crankcase in real time and transmits the real-time monitored value to the protection control device through the data input interface. The protection control device is preset with a protection standard value of the combustible gas, namely whether danger exists or not, whether subsequent engine operation safety protection measures are started or not, and when the real-time detection value is smaller than the protection standard value, no reaction is made; and when the actual detection value is larger than or equal to the protection reference value, starting subsequent protection measures.
It should be noted that the protection reference value is set according to the lowest flammable concentration of the flammable gas, and because the type of the flammable gas detected by the detection module can be changed according to the actual situation, the lowest flammable concentration of the protection reference value is different for different flammable gases, and correspondingly, the protection reference value can be changed correspondingly according to the difference of the detected flammable gases, that is, the protection reference value is the lowest flammable concentration value of the detected flammable gas.
S103, detecting whether the engine is in a running state or not when the real-time concentration value is higher than the protection reference value; if the engine is in a running state, the engine is forbidden to run, and then inert gas is filled into the crankcase through a preset pipeline; if the engine is in a stop state, inert gas is introduced into the crankcase through a preset pipeline, and then the engine is prohibited from starting.
Specifically, when the real-time detection value of the combustible gas in the crankcase is greater than or equal to the protection reference value in the protection control device, the protection control device takes protection measures to first acquire whether the engine is in a running state, that is, whether the engine is in a running state or a stopped state. If the engine is in a running state, the protection control device sends a stop signal through a preset interface to control the ignition controller of the engine not to ignite and control the gas controller of the engine to close the gas valve of the engine, so that the engine stops running quickly, and the engine is prohibited from running.
Correspondingly, if the engine is not in a running state, namely in a stopping state, when the real-time combustible gas concentration value of the crankcase monitored by the detection element reaches a set protection reference value, the protection control device judges that an event with high combustible gas concentration exists in the crankcase to carry out protection action, and firstly opens a purging gas pipeline through an output interface to fill inert gas into the crankcase, so that the concentration of the combustible gas in the crankcase is reduced; furthermore, the protection control device simultaneously sends a stop signal through the output interface to prohibit the engine from starting, namely, the ignition controller of the engine is controlled not to ignite, the gas controller of the engine is controlled to close the gas control valve of the engine, the engine is prohibited from starting, explosion events are prevented, and the operation safety of the engine is protected.
In addition, the operation state of the engine can be acquired when the detection module detects the concentration of the combustible gas, and even before the detection module detects the concentration of the combustible gas, so that different protective measures aiming at different operation states of the engine can be taken at the first time when the concentration of the combustible gas is detected to be too high and danger is possibly generated, and the safety of the engine is protected.
It should be noted that when the concentration of the combustible gas is detected to be too high and the engine is in a running state, if the engine continues to run, the concentration of the combustible gas in the crankcase may rise rapidly all the time, which may cause a danger such as explosion, and therefore, it is necessary to stop the engine running first, that is, to stop the engine running rapidly by controlling the ignition controller of the engine not to ignite and controlling the gas controller of the engine to close the gas control valve of the engine, so as to avoid the concentration of the combustible gas from rising continuously and avoid the danger. After the engine stops running, the concentration of the combustible gas cannot be rapidly increased, so that the dangers such as explosion are avoided, then the inert gas is introduced into the crankcase, the concentration of the combustible gas which flows into the crankcase is reduced, and the lowest combustible concentration cannot be reached, so that the dangers cannot occur in the crankcase; when the engine is in a stop state, the concentration of the combustible gas in the crankcase cannot be rapidly increased in a short time, so that the inert gas can be firstly introduced, the concentration of the combustible gas which enters the crankcase is reduced, and the lowest combustible concentration cannot be reached, and the crankcase is ensured not to explode. However, after the engine is started to operate subsequently, the concentration of the combustible gas in the crankcase may be rapidly increased again, so that after the inert gas is introduced, the engine is further prohibited from starting, namely the ignition controller of the engine is controlled not to ignite, and the gas controller of the engine is controlled to close the gas control valve of the engine, so that the engine is prohibited from starting, and the subsequent danger that the concentration of the combustible gas in the crankcase is increased again because the engine is restarted before the fault is not eliminated or the engine is not repaired is avoided.
According to the explosion-proof method for the crankcase of the gas fuel internal combustion engine, the two detection holes arranged on the crankcase are connected with the two interfaces of the detection module, so that a closed chamber with the same gas component is formed in the space inside the detection module and the crankcase, and the real-time concentration value of the combustible gas in the detection module is detected through the detection element, so that the real-time concentration value of the combustible gas in the crankcase is obtained; and comparing the detected real-time concentration value with a preset protection reference value, and judging whether the concentration of the combustible gas in the crankcase is too high, namely whether the combustible concentration is about to be reached. If the concentration of the combustible gas in the crankcase is too high, judging whether the engine is in a running state, if the engine is in the running state, prohibiting the engine from running, namely, controlling an ignition controller of the engine to be incapable of igniting and controlling a gas controller of the engine to close an air inlet gas control valve, so as to ensure that the concentration of the combustible gas cannot be continuously and rapidly increased, and then introducing inert gas into the crankcase, so that the concentration of the combustible gas is reduced, and the explosion risk is avoided; if the engine is in a stop state, inert gas is firstly introduced into the crankcase, the concentration of combustible gas is reduced, and then the engine is prohibited from starting, namely the ignition controller of the engine is controlled not to ignite and the gas controller of the engine is controlled to close the gas inlet control valve, so that the subsequent surge of the concentration of the combustible gas in the crankcase caused by the starting operation of the engine is avoided. Under two conditions, the concentration of the combustible gas can be reduced in time, the crankcase is guaranteed not to explode, and the safety of the engine is guaranteed.
The invention will be described in detail in connection with an embodiment of the invention for explosion-proof application in a crankcase of a gaseous-fuelled internal combustion engine, which embodiment is described below with reference to the accompanying drawings and is intended to be illustrative only and not to be construed as limiting the invention.
| Types of | Gas engine |
| Fuel | Natural gas |
| Minimum combustible concentration% VOL | 5 |
| Gas concentration alarm protection reference value% VOL of crankcase | 2.0 |
FIG. 2 is a schematic flow chart of a crankcase explosion-proof method for a gaseous fuel internal combustion engine according to another embodiment of the present application, as shown in FIG. 2:
in the explosion-proof method for the crankcase of the gas fuel internal combustion engine, the explosion-proof method can be carried out by a preset protection control device, such as a program arranged in the protection control device:
firstly, after the protection control device operates F100, the detection element monitors the concentration value of combustible gas in a crankcase in real time through an interface, and transmits the detection result to the protection control device through a data input interface of the protection control device connected with the detection element. The protection control device obtains a detection result, namely a real-time concentration value of the combustible gas in the crankcase; then, the program F102 stores and processes the data; the routine F101 compares the crank case gas concentration real-time value Vc with a protection reference value Vsd set by the routine in real time, assuming that when the detection element detects that the gas blown into the engine crank case contains methane at a concentration of 0.5% VOL, the routine F101 makes a judgment that the protection reference value Vsd (2.0% VOL) is greater than the crank case gas concentration real-time value Vc (0.5% VOL), and does not perform the protection operation of the next step, assuming that when the detection element detects that the gas blown into the engine crank case contains methane at a concentration of 2.0% VOL, the routine F101 makes a judgment that the crank case gas concentration real-time value Vc (2.0% VOL) is equal to the protection reference value Vsd (2.0% VOL), immediately executes the next step, i.e., the F103 routine that judges whether the engine is successfully started, and when the protection control device acquires an engine start signal F104, the protection control device judges that there is a high combustible gas concentration event in the crank case and makes a protection operation, the engine stop protection signal F105 is sent out through the output interface, the ignition controller of the engine is controlled not to ignite, the gas controller of the engine is controlled to close the gas control valve of the engine, the engine is rapidly stopped, and explosion caused by the increase of the amount of combustible gas entering the crankcase in the running process of the engine is avoided; furthermore, the protection control device sends a purging work instruction F106 through the output interface at the same time, and a purging gas pipeline is opened to fill inert gas into the crankcase, so that the risk of damaging personal safety in the process of maintaining the engine is avoided;
correspondingly, the program F101 compares the real-time value Vc of the crankcase gas concentration with the protection reference value Vsd set by the program in real time, if the detection element detects that the gas blown into the engine crankcase contains methane with a concentration of 0.5% VOL, the program F101 makes a judgment that the protection reference value Vsd (2.0% VOL) is greater than the real-time value Vc of the crankcase gas concentration (0.5% VOL), the next step of the protection action is not executed, assuming that when the detection element detects that the gas blown into the engine crankcase contains methane with a concentration of 2.0% VOL, the program F101 makes a judgment that the real-time value Vc of the crankcase gas concentration (2.0% VOL) is equal to the protection reference value Vsd (2.0% VOL), executes the next step of judgment, i.e., whether the engine is started successfully, the program F103 is executed, when the protection control device does not collect the engine operation signal F104, the engine is judged to be in the stopped state, the protection control device judges that the high concentration of the combustible gas exists in the crankcase and makes a protection action, sending a purging work instruction F106 through the output interface, opening a purging gas pipeline to fill inert gas into the crankcase, and avoiding the risk of damaging personal safety in the process of maintaining the engine; furthermore, the protection control device simultaneously sends a shutdown protection signal F105 through the output interface, controls the ignition controller of the engine not to ignite, controls the gas controller of the engine to close the gas control valve of the engine, enables the engine not to start and run, and avoids the explosion risk of the crankcase caused by the starting process.
It should be noted that the setting of the protection reference value Vsd to 2.0% VOL in the embodiment is only for convenience of describing the method of the present invention, and is not limited specifically, and in practical applications, the protection reference value Vsd may be set to a gas standard less than 2.0% VOL according to practical requirements, such as a safety level requirement for preventing explosion of the crankcase, and the like, and all of them fall within the protection scope of the present application.
Fig. 3 is a schematic structural diagram of a crankcase explosion-proof device of a gaseous fuel internal combustion engine provided by an embodiment of the present application, and as shown in fig. 3, the crankcase explosion-proof device of the gaseous fuel internal combustion engine provided by the embodiment of the present application is arranged on an engine body. The method comprises the following steps: the device comprises a detection module 3, a protection control device K1, an imaging display device K2 and a purging device.
In the daily use process, a gap is reserved between the piston assembly 12 and the inner wall of the cylinder sleeve 11 in the engine, a blow-by phenomenon that gas in the combustion chamber 6 passes through the gap part and enters the engine crankcase 2 inevitably exists, along with the continuous increase of the running time of the engine, the gap between the piston assembly 12 and the inner wall of the cylinder sleeve 11 is gradually increased, and the amount of gas blown into the engine crankcase 2 is increased.
The utility model provides a gaseous fuel internal combustion engine crankcase explosion-proof equipment is through setting up two crankcase detection holes that run through 2 inside and outside crankcases on engine organism 1, sets up detection module 3 in the outside of detection hole, after installation detecting element 5 on detection module 3, constitutes a airtight cavity 3a with the inside intercommunication of engine crankcase, and the gaseous component in the airtight cavity 3a of detection module 3 is synchronous the same in real time following 2 interior gaseous components of crankcase. The concentration value of the combustible gas in the crankcase 2 can be monitored in real time by means of the detection element 5. The detection module 3 is connected with a protection controller K1, the protection controller K1 receives the detection result sent by the detection module 3, compares the detection result with a protection reference value preset in the protection controller K1 in real time, and outputs a protection control signal in time to control the running state of the engine when the concentration real-time monitoring value of the combustible gas reaches the set protection reference value, so that the safe running of the gas fuel reciprocating internal combustion engine is ensured.
Two crankcase detection holes 1 and detection holes 2 penetrating through the inside and outside of a crankcase 2 are arranged on an engine body 1 of an upper space of a lubricating oil liquid level in an engine oil pan 14, the two crankcase detection holes penetrate through the inside and outside of the crankcase 2 and are arranged up and down, the aperture axis of the upper crankcase detection hole 1 is parallel to the horizontal plane of the engine body 1, and the aperture axis of the lower crankcase detection hole 2 and the horizontal plane of the engine body 1 are inclined towards the oil pan 14; particularly, when facing the end face of the crankshaft 16 rotating clockwise, the detection hole 1 and the detection hole 2 are arranged at the right side of the crankshaft 16, so that gas in the crankcase 2 stirred by the rotation of the crankshaft 16 in the running process of the engine can enter the closed chamber 3a of the detection module 3 in time; furthermore, the aperture axis of the crankcase detection hole 2 and the horizontal plane of the engine body have an inclined angle towards the oil pan, so that splashed lubricating oil generated by rotation of the crankshaft 16 in the running process of the engine can timely flow back to the oil pan 14 after entering the closed cavity 3a of the detection module 3, the lubricating oil is prevented from blocking the closed cavity 3a, the detection accuracy is improved, and the detection device is safe and reliable and is easy to implement.
The detection module 3 is arranged on the machine body 1 outside the detection hole, a cavity 3a is arranged in the detection module 3, and an interface is communicated with the inside and the outside of the cavity; the interfaces comprise an interface 1 communicated with the crankcase detection hole 1, an interface 2 communicated with the crankcase detection hole 2, an interface 3 used for mounting a detection element and an interface 4 used for connecting a purging gas pipeline; further, the interface 2 is inclined to the oil pan from the horizontal plane of the machine body 1, and the inclination angle to the oil pan 14 is set to be 25 degrees in the embodiment; further, the inclination angle of the crankcase detection hole 2 is the same as that of the interface 2, and the inclination angle is set to be 25 degrees; after the detection element 5 is arranged on the detection module 3, a closed chamber 3a communicated with the interior of the engine crankcase 2 is formed; in the running process of the engine, the crankshaft 16 rotates clockwise to stir gas in the crankcase 2 to enter the closed chamber 3a of the detection module 3 through the interface 1 communicated with the crankcase detection hole 1, and then the gas circulates back to the crankcase 2 through the interface 2 communicated with the crankcase detection hole 2, so that the gas in the closed chamber 3a can be timely updated along with the rotation stirring of the crankshaft 16; furthermore, after the splashed lubricating oil generated by the rotation of the crankshaft 16 enters the closed chamber 3a of the detection module 3, the splashed lubricating oil flows back to the oil pan 14 in time through the connector 2 which is inclined and communicated with the crankcase detection hole 2, so that the smoothness of the closed chamber 3a is ensured, and the gas components in the closed chamber 3a are synchronous and identical with the gas components in the crankcase 2 in real time.
The detection element 5 monitors the concentration value of combustible gas in the gas component in the crankcase 2 in real time through the interface 3 and transmits the real-time monitored value to the data input interface of the protection control device K1. The protection control device K1 compares the acquired real-time monitoring value of the detection element 5 with a protection reference value set by a protection control device program in real time, and performs engine operation safety protection when the concentration value is greater than or equal to the protection reference value.
In some embodiments, the detecting element 5 may be configured according to the type of composition of the gaseous fuel, for example, natural gas as the engine fuel, and the molecular formula CH4The chemical name is methane, and as known in the technical field, the combustible concentration range of methane in air is 5-20% VOL, so that the range of the selected methane concentration detector is 0-5% VOL, and a 0-5V voltage signal is output; intoOne step, when the fuel is hydrogen, the range of the hydrogen concentration detector is selected according to the combustible concentration range of the hydrogen in the air, which is the same as the purpose of the invention; in particular, the present invention achieves the same protection by using only one hydrogen concentration detector, assuming that the fuel is a mixture of methane and hydrogen, since the flammable concentration range of hydrogen is greater than that of methane.
In addition, the protection base standard value is set according to the lowest combustible concentration of combustible gas, the range of the methane concentration detector in the embodiment is 0-5% VOL, the set protection reference value is 2.0% VOL, the lowest combustible concentration of methane fleeing into the crankcase 2 can be ensured to be far away from a combustible point, the combustible gas mixture quantity fleeing into the engine crankcase 2 is judged in advance, a protection control signal is output in time to control the running state of the engine, and the safe running of the gas fuel reciprocating type internal combustion engine is ensured. The protection control device K1 collects the engine start success signal, and completes the method of safety protection control of the engine operation process and the stop state, which has been described in detail in the above method embodiment, and can be understood through the above description, and will not be described herein again.
It should be noted that, in practical applications, in the explosion-proof device for a crankcase of a gaseous fuel internal combustion engine described in this embodiment, the protection control device K1 may be a programmable logic controller, and transmits data to the imaging display device through a data bus, and the imaging display device K2 may be a configuration touch screen, and performs data display after configuration; wherein the data display content comprises a real-time data value Vc of the methane concentration in the gas which is detected by the detection element 5 and enters the crankcase 2 of the engine, and the real-time data value Vc can be stored in the programmable logic controller.
The stored historical data value can be read through the imaging display device K2, analysis data is provided for searching the reason of the concentration of methane entering the crankcase 2, an alarm protection reference value Vsd can be further set through the imaging display device K2, the set protection reference value Vsd can be displayed on the imaging display device K2 to be convenient for operators to observe, when an alarm of high concentration of combustible gas in the crankcase occurs, the alarm value is stored and displayed in time, the data value can be displayed in a curve mode, and the time of the alarm occurrence is convenient to observe and search.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
It should be noted that the terms "first," "second," and the like in the description of the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present invention, the meaning of "a plurality" means at least two unless otherwise specified.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (6)
1. A method of explosion protection of a gaseous fuel internal combustion engine crankcase, comprising:
detecting a real-time concentration value of combustible gas in a crankcase through a detection module preset on the crankcase;
comparing the real-time concentration value with a preset protection reference value, and judging whether the real-time concentration value is higher than the protection reference value;
when the real-time concentration value is higher than the protection reference value, detecting the working state of an engine;
if the engine is in a running state, the engine is forbidden to run, and then inert gas is filled into the crankcase through a preset pipeline;
if the engine is in a stop state, inert gas is introduced into the crankcase through a preset pipeline, and then the engine is prohibited from starting.
2. The gaseous fuel internal combustion engine crankcase explosion suppression method according to claim 1, wherein the prohibiting engine start includes:
controlling an ignition controller of the engine to be incapable of igniting;
a gas controller for controlling the engine closes the intake gas control valve.
3. An explosion-proof device for a crankcase of a gaseous fuel internal combustion engine, comprising:
the device comprises a detection module, a protection control device and a purging device;
the detection module is arranged on the outer wall of the crankcase, and an internal cavity of the detection module is communicated with the inside of the crankcase through a detection hole preset on the crankcase, receives combustible gas entering from the inside of the crankcase and discharges the combustible gas into the crankcase;
the detection module is used for detecting the real-time concentration value of the combustible gas in the internal cavity;
the protection control device is connected with the detection module and used for receiving and storing the detection result of the detection module;
the protection control device is also connected with the engine and used for detecting the working state of the engine; the working state comprises a stopping state and a running state;
the protection control device is also connected with the purging device and is used for prohibiting the engine from running firstly and then introducing inert gas into the crankcase through the purging device when the detected real-time concentration value is higher than a protection standard value and the engine is in a running state; or when the detected real-time concentration value is higher than the protecting standard value and the engine is in a stop state, firstly introducing inert gas into the crankcase through the purging device and then forbidding the engine to start.
4. The gaseous fuel internal combustion engine crankcase explosion prevention device of claim 3, wherein the detection hole comprises a first detection hole and a second detection hole;
the aperture axis of the first detection hole is parallel to the horizontal plane of the engine body;
and a preset angle inclining to the oil pan exists between the aperture axis of the second detection hole and the horizontal plane of the engine body.
5. The gaseous fuel internal combustion engine crankcase explosion prevention device according to claim 3,
the protection controller is connected with the engine ignition controller and is used for controlling the ignition controller of the engine not to ignite and forbidding the engine to start when the concentration of the combustible gas in the crankcase is detected to be greater than or equal to the protection reference value;
and the protection controller is connected with the engine gas controller and is used for controlling the gas controller to close the gas inlet control valve and forbidding the engine to start when the concentration of the combustible gas in the crankcase is detected to be greater than or equal to the protection reference value.
6. The gaseous fuel internal combustion engine crankcase explosion prevention device of claim 3, further comprising an imaging display device;
the imaging display device is connected with the protection control device and is used for displaying the data information in the protection control device.
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| CN202110738353.1A CN113356963A (en) | 2021-06-30 | 2021-06-30 | Explosion-proof method and device for crankcase of gas fuel internal combustion engine |
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| CN202110738353.1A CN113356963A (en) | 2021-06-30 | 2021-06-30 | Explosion-proof method and device for crankcase of gas fuel internal combustion engine |
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