CN104977141A - Method for detecting overall engine leakage of diesel engine - Google Patents
Method for detecting overall engine leakage of diesel engine Download PDFInfo
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- CN104977141A CN104977141A CN201510392396.3A CN201510392396A CN104977141A CN 104977141 A CN104977141 A CN 104977141A CN 201510392396 A CN201510392396 A CN 201510392396A CN 104977141 A CN104977141 A CN 104977141A
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Abstract
The invention relates to a method for detecting the overall engine leakage of a diesel engine, which comprises the steps of plugging an interface and connecting the interface with a leakage instrument, detecting the leakage condition and judging the detecting result, judging the leakage condition and the like. The step of detecting the leakage condition and judging the detecting result comprises the procedures of monitoring the leakage between a water channel and an oil duct, detecting the leakage of the water channel and detecting the leakage of the oil duct. According to the technical scheme of the invention, the leakage condition of the water channel and the leakage condition of the oil duct of the overall diesel engine are detected, and each leakage site can be accurately found out. Therefore, the leakage condition of the overall diesel engine can be accurately determined, and the leakage site of the diesel engine can be timely and accurately found out. The leakage detection accuracy of the overall diesel engine can be improved, so that the diesel engine can be required more targetedly. The misjudgment rate is greatly reduced, and the reworking rate of the overall diesel engine is lowered. Meanwhile, the repair cost and the energy consumption during the heat test are reduced. Moreover, the production efficiency is improved, and the assembly quality of the diesel engine is increased.
Description
Technical field
The present invention relates to the leakage detection method of auto parts and components, specifically a kind of large diesel engine complete machine leakage detection method, belongs to technical field of diesel engine production.
Background technology
Engine component in assembling process, due to parts itself defect, assemble the reason such as not in place the water channel of engine, Oil passage and oil duct etc. can be caused to have the situation of seepage.At present, three of diesel engine leak fault major part by heat examination discovery; The certain applications producer of complete machine leak detection technology, just determines 1 water channel slip limit value, and leak rate limit value sewed mutually by 1 oil duct slip limit value and water oil, oil duct, namely reprocesses as long as exceed limit value.
There is following shortcoming in existing detection technique: after 1, fault is leaked in heat examination discovery three, need to reprocess it and school bus again, add production cost greatly, reduce productive temp, and along with the application of the cold examination technology of diesel engine, more need to prevent in advance engine three leakage, reprocess in advance; 2, part producer only determines 1 cover and leaks the production model of limit value, can cause a large amount of erroneous judgements, greatly reduce production efficiency, thus cannot effective Instructing manufacture.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of Diesel Engine Complete Machine leakage detection method is provided, it is for carrying out Leak Detection to the water channel of Diesel Engine Complete Machine and oil duct, each leakage position can be specified, improve the accuracy of complete machine Leak Detection, greatly reduce erroneous judgement probability, improve production efficiency, effectively instruct existing production.
According to technical scheme provided by the invention: Diesel Engine Complete Machine leakage detection method, it is characterized in that comprising the following steps:
1), interface shutoff connect leakage instrument:
Shutoff is carried out to each oil duct interface that Diesel Engine Complete Machine is communicated with oil duct, reserves at least one oil duct interface to connect the oil duct sense channel of leakage instrument; Shutoff is carried out to each water channel interface that Diesel Engine Complete Machine is communicated with water channel, reserves at least one water channel interface to connect the water channel sense channel of leakage instrument; Mass flow sensor in leakage instrument detects the flowing reaching gas after equilibrium stage, and is converted to slip;
2), Leak Detection and result judge:
2.1), water channel and oil duct leak mutually: the oil duct first to Diesel Engine Complete Machine is inflated, and oil duct charge pressure is 2.37bar, and inflationtime is 50 seconds, and the measurement pressure in the oil duct after pressure equilibrium should be 0.18 ~ 0.22bar; During these 50 seconds, whether detected by the mass flow sensor of leakage instrument water channel sense channel has gas to enter water channel, enter if any gas, illustrate to there is water channel and oil duct leaks mutually, measurement quality flow is carried out by sensor, and be converted to the slip that water channel and oil duct leak mutually, if slip is more than 15cm
3/ min, then need to reprocess;
2.2), water channel, oil duct Leak Detection: the oil duct continued to Diesel Engine Complete Machine is inflated, oil duct charge pressure is still 2.37bar, inflationtime is 60 seconds, measurement pressure in oil duct after pressure equilibrium should be 0.18 ~ 0.22bar, Measuring Time is 10 seconds, oil duct slip is calculated, if oil duct slip is more than 600cm by the detection data of leakage instrument
3/ min, be then judged as defective; While oil duct starts to continue inflation, the water channel of Diesel Engine Complete Machine starts to inflate, water channel charge pressure is 4bar, inflationtime is also 60 seconds, measurement pressure in water channel after pressure equilibrium should be 0.72 ~ 0.88bar, Measuring Time is 10 seconds, calculates water channel slip by the detection data of leakage instrument, if water channel slip is more than 15cm
3/ min, be then judged as defective;
2.3), leakage situation judges: open and inspect limit value table (table 1) requirement according to leak source, detection judgement may be carried out by leakage position to each on Diesel Engine Complete Machine, water channel, oil duct respectively have one to judge the underproof threshold limit value of workpiece, if each leak source that leak source is opened and inspect in limit value table is all qualified, then judge that whether workpiece is qualified according to threshold limit value;
Table 1: leak source opens and inspect limit value table
| Detect position | Slip (cm 3/min) | Sense channel | Processing mode |
| Air pressure pump water inlet pipe | —— | Water channel | Find that namely this leak source is reprocessed |
| Air pressure pump rising pipe | 15 | Water channel | Exceed limit value namely to reprocess |
| Partial circulating is taken over | —— | Water channel | Find that namely this leak source is reprocessed |
| Water pump complement faying face | 15 | Water channel | Exceed limit value namely to reprocess |
| Refrigeratory and body faying face | 35 | Water channel | Exceed limit value namely to reprocess |
| Thermostat sensor | 15 | Water channel | Exceed limit value namely to reprocess |
| Respirator | —— | Oil duct | Find that namely this leak source is changed |
| Cylinder cap sand holes (crackle) | —— | Oil duct | Find that namely this leak source is reprocessed |
| Injection pump supercharging compensate pipe | 240 | Oil duct | Exceed limit value namely to reprocess |
| Bowl-type patch under the nahlock of cylinder cap rear end half | 250 | Oil duct | Exceed limit value namely to reprocess |
| Body sand holes (crackle) | —— | Oil duct | Find that namely this leak source is reprocessed/changed |
| Housing oil filler | 1100 | Oil duct | Exceed limit value namely to reprocess |
| Air pressure pump air intake opening | —— | Oil duct | Find that namely this leak source is changed |
| Air pressure pump gas outlet | —— | Oil duct | Find that namely this leak source is changed |
| Housing bolt | 250 | Oil duct | Exceed limit value namely to reprocess |
| Oil pump and steel plate faying face | 1100 | Oil duct | Exceed limit value namely to reprocess |
| Steel plate and bell housing faying face steering pump place | —— | Oil duct | Find that namely this leak source is reprocessed |
| Thermostat water-heating valve switch contacts | 4 | Water channel | Exceed limit value namely to reprocess |
| Air pressure pump and steel plate faying face | 295 | Oil duct | Exceed limit value namely to reprocess |
| Thermostat B03 silently | —— | Water channel | Find that namely this leak source is reprocessed |
| Oil pump lubricating oil pipe | 230 | Oil duct | Exceed limit value namely to reprocess |
| Bell housing crackle | —— | Oil duct | Find that namely this leak source is reprocessed |
| Cylinder cover crackle | —— | Oil duct | Find that namely this leak source is reprocessed |
| Machine cooler cock of water drain | —— | Water channel | Find that namely this leak source is reprocessed |
| SCR joint | —— | Water channel | Find that namely this leak source is reprocessed |
| Refrigeratory by-pass valve and refrigeratory faying face | —— | Oil duct | Find that namely this leak source is reprocessed |
| Oil return pipe of respirator | —— | Oil duct | Find that namely this leak source is reprocessed |
| Thermostat base and lid faying face | —— | Water channel | Find that namely this leak source is reprocessed |
| Oil sump oil discharge screw | —— | Oil duct | Find that namely this leak source is reprocessed |
| Air pressure pump upper cover and pump housing faying face | —— | Water channel | Find that namely this leak source is reprocessed |
| Oil sump seam crossing | —— | Oil duct | Find that namely this leak source is reprocessed |
| Thermostat base and cylinder cap faying face | —— | Water channel | Find that namely this leak source is reprocessed |
In Table 1, slip finite value, exceeding limit value then needs to reprocess; Slip represents with "---", as long as find that leak source just need be reprocessed; Adopt above-mentioned standard straight to Leak Detection is qualified.
As a further improvement on the present invention, described oil duct interface comprises exhaust pipe mouth, the air inlet mouth of pipe, respirator mouth, dipstick mouth, centrifugal machine filter mouth, air pressure pump air intake opening and air pressure pump gas outlet, and exhaust pipe mouth wherein, centrifugal machine filter mouth are connected the oil duct sense channel of leakage instrument with the air inlet mouth of pipe; Described water channel interface comprises water pump mouth and thermosistor water delivering orifice, and water pump mouth wherein connects the water channel sense channel of leakage instrument.
As a further improvement on the present invention, the gas being filled with oil duct and water channel in described step 2.1 and 2.2 adopts dry pressurized air.
As a further improvement on the present invention, described step 2.3 adopts soap bubble method may carry out detection judgement by leakage position to each on Diesel Engine Complete Machine, and detecting the leakage agent adopted is OKS2811 Leak Detection liquid.
The present invention compared with prior art, tool has the following advantages: the present invention is used for carrying out Leak Detection to the water channel of Diesel Engine Complete Machine and oil duct, each leakage position can be specified, accurately can judge the leakage situation of Diesel Engine Complete Machine, timely, accurately to find diesel engine leakage position, improve the accuracy of complete machine Leak Detection, to reprocess targetedly, greatly reduce erroneous judgement probability, reduce complete machine and do over again, reduce maintenance cost, reduce energy consumption during heat examination; And can also enhance productivity, promote the assembly quality of engine.
Embodiment
Below in conjunction with specific embodiment, the invention will be further described.
Instrument and equipment:
Adopt the MFL400 type leakage instrument that German FROEHLICH company produces.
Embodiment 1
Leak Detection is carried out to the Diesel Engine Complete Machine that model is 6DM2-42E3, comprises the following steps:
1), interface shutoff connect leakage instrument:
The oil duct interface that described Diesel Engine Complete Machine is communicated with oil duct comprises exhaust pipe mouth, the air inlet mouth of pipe, respirator mouth, dipstick mouth, centrifugal machine filter mouth, air pressure pump air intake opening and air pressure pump gas outlet, exhaust pipe mouth wherein, centrifugal machine filter mouth are connected the oil duct sense channel of leakage instrument with the air inlet mouth of pipe, remaining oil duct interface shutoff frock carries out shutoff; The water channel interface that described Diesel Engine Complete Machine is communicated with water channel comprises water pump mouth and thermosistor water delivering orifice, and water pump mouth wherein connects the water channel sense channel of leakage instrument, and remaining water channel interface shutoff frock carries out shutoff;
2), Leak Detection and result judge:
2.1), water channel and oil duct leak mutually: the oil duct first to Diesel Engine Complete Machine is inflated, and oil duct charge pressure is 2.37bar, and inflationtime is 50 seconds, and the measurement pressure in the oil duct after pressure equilibrium is 0.2bar; During these 50 seconds, detected in water channel by the mass flow sensor of leakage instrument water channel sense channel and whether have gas to enter, as calculated water outlet and the oil duct slip of leaking mutually is 3.2m
3/ min, is less than 15cm
3/ min, without the need to reprocessing;
2.2), water channel, oil duct Leak Detection: the oil duct continued to Diesel Engine Complete Machine is inflated, oil duct charge pressure is still 2.37bar, inflationtime is 60 seconds, measurement pressure in oil duct after pressure equilibrium is 0.2bar, Measuring Time is 10 seconds, and calculating oil duct slip by the detection data of leakage instrument is 80.2cm
3/ min, not more than 600cm
3/ min, and do not find the leak source in " leak source opens and inspect limit value table ", without the need to reprocessing; While oil duct starts to continue inflation, the water channel of Diesel Engine Complete Machine starts to inflate, water channel charge pressure is 4bar, inflationtime is also 60 seconds, measurement pressure in water channel after pressure equilibrium is 0.8bar, Measuring Time is 10 seconds, and calculating water channel slip by the detection data of leakage instrument is 3.5cm
3/ min, not more than 15cm
3/ min, and do not find the leak source in " leak source opens and inspect limit value table ", without the need to reprocessing;
2.3), leakage situation judges: adopt soap bubble method may carry out detection judgement by leakage position (position listed by " leak source opens and inspect limit value table ") to each on Diesel Engine Complete Machine, detecting the leakage agent adopted is OKS2811 Leak Detection liquid, do not find leak source after testing, and sew leak rate mutually all within limit value due to water channel, oil duct, water channel and the oil duct measured, therefore, be judged to be qualified.
The gas being filled with oil duct and water channel in the present embodiment 1 step 2.1 and 2.2 adopts dry pressurized air.
Embodiment 2
Leak Detection is carried out to the Diesel Engine Complete Machine that model is 6DM2-42E3, comprises the following steps:
1), interface shutoff connect leakage instrument:
The oil duct interface that described Diesel Engine Complete Machine is communicated with oil duct comprises exhaust pipe mouth, the air inlet mouth of pipe, respirator mouth, dipstick mouth, centrifugal machine filter mouth, air pressure pump air intake opening and air pressure pump gas outlet, exhaust pipe mouth wherein, centrifugal machine filter mouth are connected the oil duct sense channel of leakage instrument with the air inlet mouth of pipe, remaining oil duct interface shutoff frock carries out shutoff; The water channel interface that described Diesel Engine Complete Machine is communicated with water channel comprises water pump mouth and thermosistor water delivering orifice, and water pump mouth wherein connects the water channel sense channel of leakage instrument, and remaining water channel interface shutoff frock carries out shutoff;
2), Leak Detection and result judge:
2.1), water channel and oil duct leak mutually: the oil duct first to Diesel Engine Complete Machine is inflated, and oil duct charge pressure is 2.37bar, and inflationtime is 50 seconds, and the measurement pressure in the oil duct after pressure equilibrium is 0.2bar; During these 50 seconds, detected in water channel by the mass flow sensor of leakage instrument water channel sense channel and whether have gas to enter, as calculated water outlet and the oil duct slip of leaking mutually is 0.8m
3/ min, is less than 15cm
3/ min, without the need to reprocessing;
2.2), water channel, oil duct Leak Detection: the oil duct continued to Diesel Engine Complete Machine is inflated, oil duct charge pressure is still 2.37bar, inflationtime is 60 seconds, measurement pressure in oil duct after pressure equilibrium is 0.2bar, Measuring Time is 10 seconds, and calculating oil duct slip by the detection data of leakage instrument is 20.8cm
3/ min, not more than 600cm
3/ min, and do not find the leak source in " leak source opens and inspect limit value table ", without the need to reprocessing; While oil duct starts to continue inflation, the water channel of Diesel Engine Complete Machine starts to inflate, water channel charge pressure is 4bar, inflationtime is also 60 seconds, measurement pressure in water channel after pressure equilibrium is 0.6bar, Measuring Time is 10 seconds, and calculating water channel slip by the detection data of leakage instrument is 200.2cm
3/ min, more than 15cm
3/ min, needs to reprocess;
2.3), leakage situation judges: adopt soap bubble method may carry out detection judgement by leakage position to each on Diesel Engine Complete Machine, detecting the leakage agent adopted is OKS2811 Leak Detection liquid, find that refrigeratory and body faying face exist after testing to leak, and water channel slip is greater than the slip limit value at this position, therefore, judge that water channel and oil duct, mutually leakage of oil road leak qualified, and water channel leaks defective; Immediately refrigeratory and body faying face are reprocessed, till water channel Leak Detection is qualified.
Embodiment 3
Leak Detection is carried out to the Diesel Engine Complete Machine that model is 6DM2-42E3, comprises the following steps:
1), interface shutoff connect leakage instrument:
The oil duct interface that described Diesel Engine Complete Machine is communicated with oil duct comprises exhaust pipe mouth, the air inlet mouth of pipe, respirator mouth, dipstick mouth, centrifugal machine filter mouth, air pressure pump air intake opening and air pressure pump gas outlet, exhaust pipe mouth wherein, centrifugal machine filter mouth are connected the oil duct sense channel of leakage instrument with the air inlet mouth of pipe, remaining oil duct interface shutoff frock carries out shutoff; The water channel interface that described Diesel Engine Complete Machine is communicated with water channel comprises water pump mouth and thermosistor water delivering orifice, and water pump mouth wherein connects the water channel sense channel of leakage instrument, and remaining water channel interface shutoff frock carries out shutoff;
2), Leak Detection and result judge:
2.1), water channel and oil duct leak mutually: the oil duct first to Diesel Engine Complete Machine is inflated, and oil duct charge pressure is 2.37bar, and inflationtime is 50 seconds, and the measurement pressure in the oil duct after pressure equilibrium is 0.2bar; During these 50 seconds, detected in water channel by the mass flow sensor of leakage instrument water channel sense channel and whether have gas to enter, as calculated water outlet and the oil duct slip of leaking mutually is 3.8m
3/ min, is less than 15cm
3/ min, without the need to reprocessing;
2.2), water channel, oil duct Leak Detection: the oil duct continued to Diesel Engine Complete Machine is inflated, oil duct charge pressure is still 2.37bar, inflationtime is 60 seconds, measurement pressure in oil duct after pressure equilibrium is 0.16bar, Measuring Time is 10 seconds, and calculating oil duct slip by the detection data of leakage instrument is 900.8cm
3/ min, more than 600cm
3/ min, needs to reprocess; While oil duct starts to continue inflation, the water channel of Diesel Engine Complete Machine starts to inflate, water channel charge pressure is 4bar, inflationtime is also 60 seconds, measurement pressure in water channel after pressure equilibrium is 0.79bar, Measuring Time is 10 seconds, and calculating water channel slip by the detection data of leakage instrument is 1.6cm
3/ min, not more than 15cm
3/ min, and do not find the leak source in " leak source opens and inspect limit value table ", without the need to reprocessing;
2.3), leakage situation judges: adopt soap bubble method may carry out detection judgement by leakage position to each on Diesel Engine Complete Machine, detecting the leakage agent adopted is OKS2811 Leak Detection liquid, find that there is 1 housing bolt after testing and there is leakage, and oil duct slip is greater than the limit value of this position slip, judge water channel and oil duct leaks mutually, water channel leak qualified, and oil duct leak defective; Immediately housing bolt is reprocessed, till oil duct Leak Detection is qualified.
Claims (4)
1. Diesel Engine Complete Machine leakage detection method, is characterized in that comprising the following steps:
1), interface shutoff connect leakage instrument:
Shutoff is carried out to each oil duct interface that Diesel Engine Complete Machine is communicated with oil duct, reserves at least one oil duct interface to connect the oil duct sense channel of leakage instrument; Shutoff is carried out to each water channel interface that Diesel Engine Complete Machine is communicated with water channel, reserves at least one water channel interface to connect the water channel sense channel of leakage instrument; Mass flow sensor in leakage instrument detects the flowing reaching gas after equilibrium stage, and is converted to slip;
2), Leak Detection and result judge:
2.1), water channel and oil duct leak mutually: the oil duct first to Diesel Engine Complete Machine is inflated, and oil duct charge pressure is 2.37bar, and inflationtime is 50 seconds, and the measurement pressure in the oil duct after pressure equilibrium should be 0.18 ~ 0.22bar; During these 50 seconds, whether detected by the mass flow sensor of leakage instrument water channel sense channel has gas to enter water channel, enter if any gas, illustrate to there is water channel and oil duct leaks mutually, measurement quality flow is carried out by sensor, and be converted to the slip that water channel and oil duct leak mutually, if slip is more than 15cm3/min, then need to reprocess;
2.2), water channel, oil duct Leak Detection: the oil duct continued to Diesel Engine Complete Machine is inflated, oil duct charge pressure is still 2.37bar, inflationtime is 60 seconds, measurement pressure in oil duct after pressure equilibrium should be 0.18 ~ 0.22bar, Measuring Time is 10 seconds, calculate oil duct slip by the detection data of leakage instrument, if oil duct slip is more than 600cm3/min, be then judged as defective; While oil duct starts to continue inflation, the water channel of Diesel Engine Complete Machine starts to inflate, water channel charge pressure is 4bar, inflationtime is also 60 seconds, measurement pressure in water channel after pressure equilibrium should be 0.72 ~ 0.88bar, and Measuring Time is 10 seconds, calculates water channel slip by the detection data of leakage instrument, if water channel slip is more than 15cm3/min, be then judged as defective;
2.3), leakage situation judges: open and inspect limit value table (table 1) requirement according to leak source, detection judgement may be carried out by leakage position to each on Diesel Engine Complete Machine, water channel, oil duct respectively have one to judge the underproof threshold limit value of workpiece, if each leak source that leak source is opened and inspect in limit value table is all qualified, then judge that whether workpiece is qualified according to threshold limit value;
Table 1: leak source opens and inspect limit value table
In Table 1, slip finite value, exceeding limit value then needs to reprocess; Slip represents with "---", as long as find that leak source just need be reprocessed; Adopt above-mentioned standard straight to Leak Detection is qualified.
2. Diesel Engine Complete Machine leakage detection method as claimed in claim 1, it is characterized in that: described oil duct interface comprises exhaust pipe mouth, the air inlet mouth of pipe, respirator mouth, dipstick mouth, centrifugal machine filter mouth, air pressure pump air intake opening and air pressure pump gas outlet, exhaust pipe mouth wherein, centrifugal machine filter mouth are connected the oil duct sense channel of leakage instrument with the air inlet mouth of pipe; Described water channel interface comprises water pump mouth and thermosistor water delivering orifice, and water pump mouth wherein connects the water channel sense channel of leakage instrument.
3. Diesel Engine Complete Machine leakage detection method as claimed in claim 1, is characterized in that: the gas being filled with oil duct and water channel in described step 2.1 and 2.2 adopts dry pressurized air.
4. Diesel Engine Complete Machine leakage detection method as claimed in claim 1, it is characterized in that: described step 2.3 adopts soap bubble method may carry out detection judgement by leakage position to each on Diesel Engine Complete Machine, and detecting the leakage agent adopted is OKS2811 Leak Detection liquid.
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| CN105443292A (en) * | 2015-12-30 | 2016-03-30 | 广西玉柴机器股份有限公司 | Internal leakage detection method of fuel injection pump |
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| CN106124139A (en) * | 2016-08-17 | 2016-11-16 | 上海佩尼医疗科技发展有限公司 | A kind of method of quick detection dialyser seepage |
| CN107449573A (en) * | 2017-09-29 | 2017-12-08 | 郑州斯倍思机电有限公司 | A kind of engine assembly sealing propertytest and its operating method |
| CN109974941A (en) * | 2017-12-27 | 2019-07-05 | 宝沃汽车（中国）有限公司 | Engine leakproofness calibration system and calibration method |
| CN111609974A (en) * | 2020-06-20 | 2020-09-01 | 贵阳航发精密铸造有限公司 | Precision casting equiaxial crystal blade formwork crack detection equipment and detection method thereof |
| CN111666655A (en) * | 2020-05-08 | 2020-09-15 | 中国辐射防护研究院 | Method for calculating uranium hexafluoride leakage source item |
| CN112595458A (en) * | 2020-10-20 | 2021-04-02 | 陕西柴油机重工有限公司 | Water leakage detection method and detector for water pump of marine diesel engine |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105443292A (en) * | 2015-12-30 | 2016-03-30 | 广西玉柴机器股份有限公司 | Internal leakage detection method of fuel injection pump |
| CN105738040A (en) * | 2016-02-02 | 2016-07-06 | 潍柴动力扬州柴油机有限责任公司 | Individual cylinder cap water channel leakage detection device and detection method |
| CN105738040B (en) * | 2016-02-02 | 2019-05-31 | 潍柴动力扬州柴油机有限责任公司 | A kind of monomer-type cylinder head water channel leak detecting device and detection method |
| CN106124139A (en) * | 2016-08-17 | 2016-11-16 | 上海佩尼医疗科技发展有限公司 | A kind of method of quick detection dialyser seepage |
| CN106124139B (en) * | 2016-08-17 | 2019-01-29 | 上海佩尼医疗科技发展有限公司 | A kind of method of quick detection dialyzer leakage |
| CN107449573A (en) * | 2017-09-29 | 2017-12-08 | 郑州斯倍思机电有限公司 | A kind of engine assembly sealing propertytest and its operating method |
| CN109974941A (en) * | 2017-12-27 | 2019-07-05 | 宝沃汽车（中国）有限公司 | Engine leakproofness calibration system and calibration method |
| CN111666655A (en) * | 2020-05-08 | 2020-09-15 | 中国辐射防护研究院 | Method for calculating uranium hexafluoride leakage source item |
| CN111609974A (en) * | 2020-06-20 | 2020-09-01 | 贵阳航发精密铸造有限公司 | Precision casting equiaxial crystal blade formwork crack detection equipment and detection method thereof |
| CN112595458A (en) * | 2020-10-20 | 2021-04-02 | 陕西柴油机重工有限公司 | Water leakage detection method and detector for water pump of marine diesel engine |
| CN112595458B (en) * | 2020-10-20 | 2023-08-29 | 陕西柴油机重工有限公司 | Water leakage detection method and detector for marine diesel engine water pump |
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Application publication date: 20151014 |