CN114034439A - Air tightness test method for cylinder cover gas part of dual-fuel host - Google Patents
Air tightness test method for cylinder cover gas part of dual-fuel host Download PDFInfo
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- CN114034439A CN114034439A CN202111286232.4A CN202111286232A CN114034439A CN 114034439 A CN114034439 A CN 114034439A CN 202111286232 A CN202111286232 A CN 202111286232A CN 114034439 A CN114034439 A CN 114034439A
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- 239000000446 fuel Substances 0.000 title claims abstract description 26
- 238000010998 test method Methods 0.000 title claims abstract description 15
- 239000007789 gas Substances 0.000 claims abstract description 144
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 44
- 230000006978 adaptation Effects 0.000 claims abstract description 27
- 238000007789 sealing Methods 0.000 claims abstract description 24
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 22
- 238000001514 detection method Methods 0.000 claims description 10
- 239000002737 fuel gas Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 3
- 230000009977 dual effect Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 claims description 2
- 230000000087 stabilizing effect Effects 0.000 claims description 2
- 238000012795 verification Methods 0.000 claims description 2
- 238000002347 injection Methods 0.000 description 8
- 239000007924 injection Substances 0.000 description 8
- 239000003915 liquefied petroleum gas Substances 0.000 description 7
- 238000011900 installation process Methods 0.000 description 5
- 238000004880 explosion Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
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- Examining Or Testing Airtightness (AREA)
Abstract
A gas tightness test method for a cylinder cover gas component of a dual-fuel host machine is characterized in that the gas component and the cylinder cover are integrally installed and then integrally verified, wherein the cylinder cover of the gas component and a special adaptation block tool are connected into a whole, a high-pressure control oil channel, a low-pressure oil channel, a sealing oil channel and a gas channel which are independent and closed are formed inside the gas component, the gas component is connected with a control electrical box, the special adaptation block tool is connected with a hydraulic pump pressurizing unit and a nitrogen booster pump, the hydraulic pump pressurizing unit supplies oil with rated pressure to the high-pressure control oil channel, the sealing oil channel and the low-pressure oil channel, the nitrogen booster pump supplies gas with the gas channel with the fuel with the rated pressure, and the electrical control box controls the gas tightness test to be carried out until the gas tightness of the whole formed by the gas component, the cylinder cover and the special adaptation block tool reaches the standard. The invention verifies that the air tightness of the cylinder cover gas part reaches the standard, ensures the quality of the whole machine product of the dual-fuel host, and has the advantages of simplicity, feasibility, strong operability, high safety and accurate result.
Description
Technical Field
The invention relates to a manufacturing process of a marine diesel engine, in particular to an air tightness test method for a cylinder cover gas component of a dual-fuel main engine, and belongs to the technical field of marine diesel engine manufacturing.
Background
In order to enable ships to comply with IMO SOx emission regulations, which were in force worldwide in 2021, many LPG ship operators have called for MAN Energy Solutions to develop engines fueled with LPG (liquefied petroleum gas) so as to utilize goods (LPG) carried thereby as fuel, and MAN has introduced and updated dual-fuel liquefied petroleum gas ME-GI engines on this background.
The ignition temperature of LPG is lower than that of other fuels, generally 430-460 ℃, the explosion limit is narrower and is 1.5-9.5%, and the lower explosion limit is lower than that of other fuels, so the LPG is dangerous, and combustion and explosion can be caused by ignition spark, so the requirement of the ME-GI host machine on air tightness is very strict. Therefore, after the cylinder cover and the gas component of the dual-fuel main machine are installed, an air tightness test needs to be carried out, the purpose is to check the installation condition of the cylinder cover and the gas block, check whether leakage exists or not, avoid serious danger possibly caused by the leakage after the subsequent main machine is placed on a platform, and guarantee the safety of test run. The gas tightness test equipment for the GI gas module is used for a gas tightness test performed after a cylinder cover and a gas part of a GI host are installed.
Disclosure of Invention
The invention aims to solve the technical problem that after the gas component of a dual-fuel host and a cylinder cover are assembled, local leakage may exist on the whole body, so that a motor car cannot be driven, and provides a simple, safe and strong-operability gas tightness test method for the gas component of the cylinder cover of the dual-fuel host.
The technical scheme adopted for solving the technical problems is as follows:
the utility model provides a gas tightness test method for cylinder cap gas part of dual fuel host computer, carries out the verification of whole gas tightness after gas part and cylinder cap installation are accomplished, its characterized in that: the gas component is connected with the cylinder cover and the special adapting block tool into a whole through bolts, a high-pressure control oil channel, a low-pressure oil channel, a sealing oil channel and a gas channel which are independent and closed are formed inside the gas component, the gas component is provided with a leakage detecting cover plate and is connected to the control electrical box through a cable, the electric appliance control box is provided with a gas pressure sensor, the special adapting block tooling is connected to a hydraulic pump pressurizing unit and a nitrogen pressurizing pump through a high-pressure hose, the hydraulic pump pressurizing unit supplies oil of a rated pressure to the high-pressure control oil passage, the seal oil passage, and the low-pressure oil passage, the nitrogen booster pump is right the gas channel supplies the gas of rated pressure, going on of electrical apparatus control box control gas tightness test, until the holistic gas tightness that gas part, cylinder cap and special adaptation piece frock constitute is up to standard.
Further, the air tightness test method comprises the following specific steps:
1) the gas component is respectively connected with the cylinder cover and the special adapting block tool into a whole through bolts, so that a high-pressure control oil channel, a low-pressure oil channel, a sealing oil channel and a gas channel which are independent and closed are formed in the gas component;
2) the electric appliance control box is connected with the gas component through a cable, the hydraulic pump pressurizing unit is connected with the special adaptation block through a high-pressure hose so as to supply high-pressure control oil, sealing oil and low-pressure oil to the special adaptation block tool, and the nitrogen booster pump is connected with the special adaptation block tool through a high-pressure hose so as to supply gas to the special adaptation block tool;
3) connecting a leakage detection cover plate of the gas component to a transparent measuring cup through a transparent hose so as to observe bubbles generated by leakage;
4) electrifying the electric appliance control box, supplying oil at rated pressure through the hydraulic pump pressurizing unit to fill the high-pressure control oil channel, the low-pressure oil channel and the sealing oil channel with oil bodies, supplying gas at rated pressure through the nitrogen booster pump to fill the gas channel with nitrogen so as to meet the test requirement;
5) and starting the dual-fuel host to test, simulating various working conditions, controlling the gas component through the electric appliance control box, maintaining the pressure of the gas in the gas channel, and verifying the integral gas tightness.
Further, the step 5) further comprises: gradually pressurizing the fuel gas in the fuel gas channel, increasing the pressure of each gear by 50bar, stabilizing for one minute until the rated pressure reaches 300bar, observing the value of a fuel gas pressure sensor of the electric appliance control box while the pressure is increased, and confirming that the value is within a reasonable value; and (3) maintaining the pressure for 5 minutes after the whole nitrogen boosting process is finished, wherein the air bubbles generated in the transparent measuring cup are in a required range in the period, namely the air tightness is qualified, and the air tightness of a cylinder cover gas component of the dual-fuel host machine is good.
Furthermore, the special adaptation block tool is used for simulating the effect of the gas adaptation block of the gas component, and a high-pressure control oil supply cavity channel, two low-pressure oil supply cavity channels, a sealing oil supply cavity channel, two oil body discharge cavity channels, a gas supply cavity channel and two gas leakage detection cavity channels are arranged in the special adaptation block tool.
Furthermore, the inlets of the high-pressure control oil supply cavity channel, the low-pressure oil supply cavity channel, the sealing oil supply cavity channel, the oil body discharge cavity channel, the gas supply cavity channel and the gas leakage detection cavity channel are all connected with quick connectors.
Furthermore, the joints of the high-pressure control oil supply cavity channel, the low-pressure oil supply cavity channel, the sealing oil supply cavity channel, the oil body discharge cavity channel, the gas supply cavity channel and the gas leakage detection cavity channel with the gas component are respectively provided with a sealing ring.
Compared with the prior art, the invention has the beneficial effects that:
1) according to the invention, the gas tightness test is carried out on the integrity formed by the gas part, the cylinder cover and the special adapting block tool, so that the gas tightness of the gas part of the cylinder cover is verified and guaranteed to reach the standard, the risk of gas leakage is eliminated, and the product quality of the whole dual-fuel host is guaranteed.
2) The method is simple and feasible, strong in operability, high in safety and accurate in result.
Drawings
Fig. 1 is a schematic diagram of the principles of the present invention.
In the figure, the position of the upper end of the main shaft,
1-special adaptation piece frock, 2-gas part, 3-leak hunting apron, LPS-low pressure oil, HPS-high pressure control oil, Sealing oil, DRAIN-bleed oil, ELWC-electrical apparatus control forces to close window valve switch valve, PCGB-gas pressure sensor, GCRV-electrical apparatus control gas channel pressure bleed switch valve, ELWI-electrical apparatus control window valve switch valve, ELGI-electrical apparatus control gas valve injection valve switch valve, ELGIB-electrical apparatus control gas injection valve function switch valve.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and examples, but the scope of the invention as claimed should not be limited thereby.
The invention is used for carrying out the air tightness test on the whole cylinder cover gas part of the dual-fuel host after the gas part and the cylinder cover are installed.
Referring to fig. 1, a gas component 2 is connected with a cylinder cover by a bolt through an installation process, the gas component 2 is connected to a control electrical box by a cable, a special adaptation block tool 1 is connected with the gas component 2 by a bolt, the special adaptation block tool 1 is connected to a hydraulic pump pressurizing unit and a nitrogen booster pump by a high-pressure hose, rated-pressure oil supply is performed on an integral control oil channel, a sealing oil channel and a low-pressure oil channel by an auxiliary equipment hydraulic pump pressurizing unit, rated-pressure gas supply is performed on the integral gas channel by the auxiliary equipment nitrogen booster pump, and an air-tight test is performed by control of the electrical control box until the integral air-tight test of the gas component 2, the cylinder cover and the special adaptation block tool 1 reaches the standard.
And a leakage detection cover plate 3 is arranged on the gas component. The control electrical apparatus case includes: the device comprises an electrical appliance control forced closing window valve switch valve, a gas pressure sensor, an electrical appliance control gas channel pressure release switch valve, an electrical appliance control window valve switch valve, an electrical appliance control gas valve injection valve switch valve and an electrical appliance control gas injection valve function switch valve.
The special adaptation block tool 1 is mainly used for simulating the action of a fuel gas adaptation block of a fuel gas component of a host machine and is beneficial to performing an air tightness test on a single cylinder assembly in a complex environment. Wherein special adaptation piece frock 1 inner structure is that six oil body chamber ways and 3 gas chamber ways, simulates one high pressure control oil respectively and supplies the chamber way, twice low pressure oil supply chamber way, one sealed oil supply chamber way and twice oil body chamber way of releasing, and a gas supplies the chamber way, and two gas leak hunting chamber ways, these chamber way entrances all link to each other with quick-operation joint, make things convenient for the plug, and 2 junctions with gas part all are provided with the sealing washer to ensure airtight.
The air tightness test method comprises the following specific steps:
1) according to the installation process requirement, the gas component 2 is connected with the cylinder cover through a bolt, and the special adapting block tool 1 is connected with the gas component 2 through a bolt.
2) According to the installation process, an appliance-controlled forced-closing window valve switch valve (ELWC), a gas pressure sensor (PCGB), an appliance-controlled gas channel pressure relief switch valve (GCRV), an appliance-controlled window valve switch valve (elvi), an appliance-controlled gas valve injection valve switch valve (ELGI), an appliance-controlled gas injection valve function switch valve (ELGIB), and the like of the gas component 2 are connected to an appliance control box through cables, and the appliance control box is energized.
3) According to the installation process, the high-pressure control oil (HPS), the low-pressure oil (LPS), the Sealing oil (Sealing oil), the DRAIN oil (DRAIN) and other quick joints of the special adaptation block tool 1 are connected to the corresponding quick joints of the hydraulic pump pressurizing unit through high-pressure hoses, and the nitrogen quick joint of the special adaptation block tool 1 is connected to the quick joint of the nitrogen booster pump through the installation process.
4) The leak detection cover plate 3 of the gas component 2 is connected to a transparent measuring cup through a transparent hose so as to observe bubbles generated by leakage.
5) And the oil supply with rated pressure is provided for the integral channel of low-pressure oil, high-pressure control oil and sealing oil.
6) The method comprises the steps of forcibly closing an electric appliance control window valve switch valve (ELWC), an electric appliance control gas channel pressure relief switch valve (GCRV), an electric appliance control gas valve injection valve switch valve (ELGI) and an electric appliance control gas injection valve function switch valve (ELGIB) of an electric appliance control box, closing the electric appliance control window valve switch valve (ELWI), and opening the electric appliance control window valve switch valve (ELWI).
7) The integral nitrogen channel is provided with nitrogen with rated pressure, for safety, the nitrogen is required to be stabilized for one minute every 50bar in the pressurizing process until the rated pressure is 300bar, and the numerical value of a gas pressure sensor (PCGB) of an electric appliance control box is observed and judged to be within a reasonable numerical value in the pressure rising process.
8) After the nitrogen pressure rise is finished, closing an electric appliance control window valve switch valve (ELWI), keeping the pressure for 5 minutes, and keeping the bubbles within the required range within five minutes, namely, the air tightness is good, and the air tightness test is qualified.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. That is, all equivalent changes and modifications made within the scope of the present invention should be considered to be within the technical scope of the present invention.
Claims (6)
1. The utility model provides a gas tightness test method for cylinder cap gas part of dual fuel host computer, carries out the verification of whole gas tightness after gas part and cylinder cap installation are accomplished, its characterized in that: the gas component is connected with the cylinder cover and the special adapting block tool into a whole through bolts, a high-pressure control oil channel, a low-pressure oil channel, a sealing oil channel and a gas channel which are independent and closed are formed inside the gas component, the gas component is provided with a leakage detecting cover plate and is connected to the control electrical box through a cable, the electric appliance control box is provided with a gas pressure sensor, the special adapting block tooling is connected to a hydraulic pump pressurizing unit and a nitrogen pressurizing pump through a high-pressure hose, the hydraulic pump pressurizing unit supplies oil of a rated pressure to the high-pressure control oil passage, the seal oil passage, and the low-pressure oil passage, the nitrogen booster pump is right the gas channel supplies the gas of rated pressure, going on of electrical apparatus control box control gas tightness test, until the holistic gas tightness that gas part, cylinder cap and special adaptation piece frock constitute is up to standard.
2. The gas tightness test method for the cylinder head gas component of the dual-fuel host machine according to claim 1, characterized in that: the air tightness test method comprises the following specific steps:
1) the gas component is respectively connected with the cylinder cover and the special adapting block tool into a whole through bolts, so that a high-pressure control oil channel, a low-pressure oil channel, a sealing oil channel and a gas channel which are independent and closed are formed in the gas component;
2) the electric appliance control box is connected with the gas component through a cable, the hydraulic pump pressurizing unit is connected with the special adaptation block through a high-pressure hose so as to supply high-pressure control oil, sealing oil and low-pressure oil to the special adaptation block tool, and the nitrogen booster pump is connected with the special adaptation block tool through a high-pressure hose so as to supply gas to the special adaptation block tool;
3) connecting a leakage detection cover plate of the gas component to a transparent measuring cup through a transparent hose so as to observe bubbles generated by leakage;
4) electrifying the electric appliance control box, supplying oil at rated pressure through the hydraulic pump pressurizing unit to fill the high-pressure control oil channel, the low-pressure oil channel and the sealing oil channel with oil bodies, supplying gas at rated pressure through the nitrogen booster pump to fill the gas channel with nitrogen so as to meet the test requirement;
5) and starting the dual-fuel host to test, simulating various working conditions, controlling the gas component through the electric appliance control box, maintaining the pressure of the gas in the gas channel, and verifying the integral gas tightness.
3. The airtightness test method for the cylinder head gas component of the dual-fuel main engine according to claim 2, characterized in that: the step 5) also comprises the following steps: gradually pressurizing the fuel gas in the fuel gas channel, increasing the pressure of each gear by 50bar, stabilizing for one minute until the rated pressure reaches 300bar, observing the value of a fuel gas pressure sensor of the electric appliance control box while the pressure is increased, and confirming that the value is within a reasonable value; and (3) maintaining the pressure for 5 minutes after the whole nitrogen boosting process is finished, wherein the air bubbles generated in the transparent measuring cup are in a required range in the period, namely the air tightness is qualified, and the air tightness of a cylinder cover gas component of the dual-fuel host machine is good.
4. The gas tightness test method for the cylinder head gas component of the dual-fuel host machine according to claim 1, characterized in that: the special adaptation block tool is used for simulating the effect of the gas adaptation block of the gas component, and is internally provided with a high-pressure control oil supply cavity channel, two low-pressure oil supply cavity channels, a sealing oil supply cavity channel, two oil body discharge cavity channels, a gas supply cavity channel and two gas leakage detection cavity channels.
5. The gas tightness test method for the cylinder head gas component of the dual-fuel host machine according to claim 4, is characterized in that: and the inlets of the high-pressure control oil supply cavity channel, the low-pressure oil supply cavity channel, the sealing oil supply cavity channel, the oil body discharge cavity channel, the gas supply cavity channel and the gas leakage detection cavity channel are connected with quick connectors.
6. The gas tightness test method for the cylinder head gas component of the dual-fuel host machine according to claim 4, is characterized in that: and sealing rings are arranged at the joints of the high-pressure control oil supply cavity channel, the low-pressure oil supply cavity channel, the sealing oil supply cavity channel, the oil body discharge cavity channel, the gas supply cavity channel and the gas leakage detection cavity channel with the gas component respectively.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111286232.4A CN114034439A (en) | 2021-11-02 | 2021-11-02 | Air tightness test method for cylinder cover gas part of dual-fuel host |
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| CN202111286232.4A CN114034439A (en) | 2021-11-02 | 2021-11-02 | Air tightness test method for cylinder cover gas part of dual-fuel host |
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