CN110702316A - Device and method for testing tightness of natural gas hydraulic drive pipeline of diesel engine - Google Patents
Device and method for testing tightness of natural gas hydraulic drive pipeline of diesel engine Download PDFInfo
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- CN110702316A CN110702316A CN201910997399.8A CN201910997399A CN110702316A CN 110702316 A CN110702316 A CN 110702316A CN 201910997399 A CN201910997399 A CN 201910997399A CN 110702316 A CN110702316 A CN 110702316A
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- hydraulic
- distribution block
- pumping pressure
- hydraulic oil
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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
- G01M3/025—Details with respect to the testing of engines or engine parts
Abstract
A device and a method for testing the tightness of a natural gas hydraulic drive pipeline of a diesel engine are disclosed, wherein the natural gas hydraulic drive pipeline comprises a distribution block and a hydraulic drive pipe, the distribution block comprises a leakage detection hole, a hydraulic oil inlet and a plurality of hydraulic oil outlets, the hydraulic oil inlet is communicated with the plurality of hydraulic oil outlets, and the plurality of hydraulic oil outlets are respectively connected with an air inlet valve of each cylinder of the diesel engine through the hydraulic drive pipe; the method is characterized in that: the hydraulic oil inlet of the distribution block is hermetically connected with a pumping pressure tool, the pumping pressure tool is connected with a movable hydraulic pump truck through a hydraulic hose and a quick coupling thereof, the movable hydraulic pump truck provides hydraulic oil corresponding to detection pressure and enters each air inlet valve, and whether leakage exists in a natural gas hydraulic driving pipeline or not is detected by observing leakage conditions of a leakage detection hole and a hydraulic driving pipe on the distribution block. The invention advances the inspection of the pipeline sealing performance to the assembly stage, avoids the operation difficulty caused by narrow space on the experiment bench, and achieves the effects of improving the operation efficiency and ensuring the installation quality.
Description
Technical Field
The invention relates to a manufacturing process of a low-pressure dual-fuel host of a marine low-speed diesel engine, in particular to a device and a method for testing the tightness of a natural gas hydraulic drive pipeline of a diesel engine, and belongs to the technical field of marine diesel engines.
Background
With the gradual entering of international emission regulations into the TIII era, a dual-fuel host capable of simultaneously using diesel oil and natural gas is introduced to a marine low-speed diesel engine in order to solve the emission problem, and meanwhile, a natural gas pipeline system is added to the host. The natural gas pipeline system controls gas to enter the cylinder sleeve through the air inlet valves on two sides of the cylinder sleeve, the air inlet valves are driven by hydraulic oil of about 200bar, the hydraulic oil is controlled to enter the air inlet valves through the electromagnetic valves, the plungers are pushed to open the valve rods, and the valve rods are reset by the springs and closed again after the hydraulic oil is cut off. In each power stroke of the diesel engine, the air inlet valve needs to be opened and closed once, the air inlet valve needs to be opened at the moment before the piston moves upwards to the air inlet, and the air inlet valve needs to be closed at the moment after the piston moves to the air inlet, namely the opening and closing time of each time of the air inlet valve is in milliseconds, so that the hydraulic oil pipeline is required to maintain excellent sealing performance so as to keep pressure stable.
Whether reveal after installing to natural gas hydraulic drive pipeline at present, rely on the host computer to boost the fuel feeding by servo oil pump in the rack experiment stage of later stage to inspect basically, if appear installing the leakproofness when not good leading to revealing, just tear open at the rack experiment period and examine the change, this has just led to the operating space not enough and has taken the problem of experiment rack time overlength, simultaneously because hydraulic line operating condition pressure exceeds 200bar, there is the potential safety hazard brought by revealing, consequently need a high-efficient reliable pipeline leakproofness pumping method, in order to reach the purpose of in time discovering the hidden danger of leaking and reducing rack occupation time.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a device and a method for testing the tightness of a natural gas hydraulic drive pipeline of a diesel engine aiming at a dual-fuel host, wherein the operation of testing the tightness of the pipeline installation is carried out in the pipeline assembly stage in advance, and the later stage of bench experiment is not required to be waited for, so that the problems that the pipeline maintenance operation occupies too long bench time and the bench space is narrow and inconvenient to operate are solved, the effects of improving the maintenance operation efficiency and ensuring the installation quality reliability are achieved, and the requirement of high tightness of the natural gas hydraulic drive pipeline installation is met.
Based on the purpose, the technical scheme adopted by the invention is as follows:
a method for testing the tightness of a natural gas hydraulic drive pipeline of a diesel engine comprises a distribution block and a hydraulic drive pipe, wherein the distribution block comprises a leakage detection hole, a hydraulic oil inlet and a plurality of hydraulic oil outlets; the method is characterized in that: the hydraulic oil inlet of the distribution block is hermetically connected with a pumping pressure tool, the pumping pressure tool is connected with a movable hydraulic pump truck through a hydraulic hose and a quick coupling thereof, the movable hydraulic pump truck provides hydraulic oil corresponding to detection pressure, the hydraulic hose, the pumping pressure tool, the distribution block and the hydraulic drive pipe enter each air inlet valve in sequence, and whether the natural gas hydraulic drive pipeline leaks or not is checked by observing leakage detection holes in the distribution block and leakage conditions of the hydraulic drive pipe.
Further, the pressure resistance of the quick joint is not lower than 200 bar.
Further, the test method comprises the following specific steps:
1) the distribution block is arranged on the air cylinder and is connected with each air inlet valve through the hydraulic driving pipe, and after the hydraulic driving pipe is connected with each air inlet valve, the pumping pressure tool is fixedly connected with the distribution block;
2) connecting the pumping pressure tool and the movable hydraulic pump truck by using a hydraulic hose through a quick connector, and unloading the leakage detection plug of the distribution block;
3) starting the movable hydraulic pump truck and slowly boosting, and observing whether hydraulic oil flows out from the leakage detecting hole of the distribution block or not; if the leakage detecting hole is found to have hydraulic oil flowing out, closing the movable hydraulic pump truck, and detecting according to the following step 4); if no hydraulic oil flowing out of the leak detection hole is found, implementing the step 5);
4) according to the oil leakage position of the distribution block, the hydraulic drive pipe is dismantled, the sealing surfaces at two ends are checked, and if the sealing surfaces are damaged, the sealing surfaces are repaired by manual polishing or grinding; if the manual repair cannot be carried out, replacing the hydraulic driving pipe and reinstalling;
5) the testing oil pressure is increased, and the steps 3) and 4) are repeated until the output oil pressure of the mobile hydraulic pump truck is increased to 250bar, and no leakage is generated in the leakage detecting hole;
6) and (4) dismantling the pumping pressure tool, and transferring to the next hydraulic drive pipeline to perform a pumping pressure test until the tightness test work of all the natural gas hydraulic drive pipelines of the diesel engine is completed.
The other technical scheme of the invention is as follows:
the device for testing the tightness of the natural gas hydraulic driving pipeline of the diesel engine is a pumping pressure tool, a hydraulic oil channel is arranged in the pumping pressure tool and is communicated with the upper surface of the pumping pressure tool through a quick connector, the lower surface of the pumping pressure tool is a sealed spherical surface, and the pumping pressure tool is fixedly connected to a distribution block of the gas hydraulic driving pipeline through a connecting bolt and is in close contact with the distribution block by virtue of the sealed spherical surface.
Compared with the prior art, the invention has the following technical effects:
1. according to the characteristics of the natural gas hydraulic drive pipeline, the scheme for performing the pipeline sealing pump pressure test in the assembly stage is provided, the maintenance is completed in the assembly stage, and the problems of difficult operation and low operation efficiency caused by narrow space on an experiment bench are solved, so that the labor efficiency is improved.
2. The sealing experiment is advanced from the bench experiment period to the assembly stage, so that the leakage of the pipeline is found in advance and the pipeline is overhauled, and the occupation period of the bench is shortened;
3. the testing method adopts the devices such as the movable hydraulic pump truck, the hydraulic hose, the quick connector and the like, so that the quick connection and the disassembly of the whole pumping system are realized, meanwhile, the pressure of the hydraulic pump can be slowly increased, the continuous observation is realized, and the potential safety hazard possibly caused by the leakage of high-pressure liquid is avoided.
Description of the drawings:
fig. 1 is a schematic view of the installation of the present invention.
Fig. 2 is a schematic view of the pumping tool and the dispensing block.
FIG. 3 is a schematic flow diagram of the present invention.
In the figure, the position of the upper end of the main shaft,
the hydraulic system comprises an air cylinder A, an air inlet valve B, a pump pressure tool 1, a connecting bolt 2, a distribution block 3, a movable hydraulic pump truck 4, a hydraulic hose 5, a hydraulic driving pipe 6, a hydraulic oil inlet 7, a hydraulic oil outlet 8, a sealing spherical surface 9 and a quick connector 10.
Detailed Description
The device and the method for testing the tightness of the natural gas hydraulic drive pipeline of the diesel engine according to the present invention are further described in detail with reference to the accompanying drawings and the specific embodiments, but the scope of the claimed invention is not limited thereby.
The method for testing the tightness of the natural gas hydraulic driving pipeline of the diesel engine is used for a marine dual-fuel host, the natural gas hydraulic driving pipeline comprises a distribution block and a hydraulic driving pipe, the distribution block comprises a leakage detection hole, a hydraulic oil inlet and a plurality of hydraulic oil outlets, a leakage detection stuffy plug is connected to the leakage detection hole, the hydraulic oil inlet is connected with a hydraulic oil header pipe and is communicated with the hydraulic oil outlets, and the hydraulic oil outlets are respectively connected with air inlet valves of cylinders of the diesel engine through the hydraulic driving pipe; typically, a hydraulic oil manifold supplies hydraulic oil to the four intake valves through the distribution block and the hydraulic drive pipes. The testing method comprises the steps that a pumping pressure tool is connected to a hydraulic oil inlet of the distribution block in a sealing mode, the pumping pressure tool is connected with the movable hydraulic pump truck through a hydraulic hose, the hydraulic hose is connected with the pumping pressure tool and the movable hydraulic pump truck through a quick connector, and the pressure resistance of the quick connector is not lower than 200 bar; the movable hydraulic pump truck provides hydraulic oil corresponding to detection pressure, enters each air inlet valve through a hydraulic hose, a pumping pressure tool, a distribution block and a hydraulic driving pipe in sequence, and checks whether the natural gas hydraulic driving pipeline leaks or not by observing leakage detection holes in the distribution block and leakage conditions of the hydraulic driving pipe.
Example 1
Referring to fig. 1, a hydraulic oil passage is disposed inside the pumping tool 1, and is communicated with the upper surface of the pumping tool 1 through a quick connector 10, and the lower surface of the pumping tool 1 is a sealing spherical surface 9. The pumping pressure tool 1 is fixedly connected to a distribution block 3 of the gas hydraulic drive pipeline through a connecting bolt 2, and is in close contact with the distribution block 3 through the sealing spherical surface 9, and the spherical surface size of the sealing spherical surface 9 is determined and processed according to the distribution block 3. The distribution block 3 is provided with a leakage detection hole, a hydraulic oil inlet 7 and a plurality of hydraulic oil outlets 8, the hydraulic oil inlet 7 is communicated with the hydraulic oil outlets 8, and the leakage detection hole is connected with a leakage detection plug. Referring to fig. 2, the distribution block 3 is installed on a cylinder a, and the hydraulic oil outlets 8 are respectively connected with the intake valves B of the cylinders of the diesel engine through hydraulic driving pipes 6.
The test method comprises the following specific operation steps:
1) mounting the distribution block 3 on the cylinder A, connecting the distribution block with each air inlet valve B through the hydraulic driving pipe 6, connecting the pumping pressure tool 1 with the distribution block 3 through a connecting bolt 2 after assembly is finished, and cross-screwing the connecting bolt 2;
2) connecting a quick interface 10 of the pumping pressure tool 1 and a movable hydraulic pump truck 4 through a quick connector by using a hydraulic hose 5, and unloading a leakage detection plug on the side surface of the distribution block 1;
3) starting the movable hydraulic pump truck 4 and slowly boosting, and observing whether hydraulic oil flows out from the leakage detection holes in the side surfaces of the distribution blocks 3; if the leakage detecting hole is found to have hydraulic oil flowing out, closing the movable hydraulic pump truck 4, and detecting according to the following step 4); if no hydraulic oil flowing out of the leak detection hole is found, implementing the step 5);
4) checking the oil leakage position of the distribution block 3, removing the hydraulic drive pipe 6, checking the sealing surfaces at two ends, and if slight damage to the sealing surfaces is found, performing manual polishing repair; if the flaw is deep, grinding; if the manual repair cannot be carried out, the hydraulic driving pipe 6 is replaced and reinstalled;
5) the testing oil pressure is increased, and the steps 3) and 4) are repeated until the output oil pressure of the mobile hydraulic pump truck 4 is increased to 250bar, and no leakage still exists in the leakage detecting hole;
6) and (3) dismantling the pumping pressure tool 1, and transferring to the next hydraulic drive pipeline for a pumping pressure test until the tightness test work of all the natural gas hydraulic drive pipelines of the diesel engine is completed.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, but rather the present invention is intended to cover all equivalent variations and modifications within the spirit and scope of the present invention.
Claims (4)
1. A method for testing the tightness of a natural gas hydraulic drive pipeline of a diesel engine comprises a distribution block and a hydraulic drive pipe, wherein the distribution block comprises a leakage detection hole, a hydraulic oil inlet and a plurality of hydraulic oil outlets; the method is characterized in that: the hydraulic oil inlet of the distribution block is hermetically connected with a pumping pressure tool, the pumping pressure tool is connected with a movable hydraulic pump truck through a hydraulic hose and a quick coupling thereof, the movable hydraulic pump truck provides hydraulic oil corresponding to detection pressure, the hydraulic hose, the pumping pressure tool, the distribution block and the hydraulic drive pipe enter each air inlet valve in sequence, and whether the natural gas hydraulic drive pipeline leaks or not is checked by observing leakage detection holes in the distribution block and leakage conditions of the hydraulic drive pipe.
2. The method for testing the tightness of the natural gas hydraulic drive pipeline of the diesel engine according to claim 1, characterized in that: the pressure resistance of the quick joint is not lower than 200 bar.
3. The method for testing the tightness of the natural gas hydraulic drive pipeline of the diesel engine according to claim 1, characterized in that: the test method comprises the following specific steps:
1) the distribution block is arranged on the air cylinder and is connected with each air inlet valve through the hydraulic driving pipe, and after the hydraulic driving pipe is connected with each air inlet valve, the pumping pressure tool is fixedly connected with the distribution block;
2) connecting the pumping pressure tool and the movable hydraulic pump truck by using a hydraulic hose through a quick connector, and unloading the leakage detection plug of the distribution block;
3) starting the movable hydraulic pump truck and slowly boosting, and observing whether hydraulic oil flows out from the leakage detecting hole of the distribution block or not; if the leakage detecting hole is found to have hydraulic oil flowing out, closing the movable hydraulic pump truck, and detecting according to the following step 4); if no hydraulic oil flowing out of the leak detection hole is found, implementing the step 5);
4) according to the oil leakage position of the distribution block, the hydraulic drive pipe is dismantled, the sealing surfaces at two ends are checked, and if the sealing surfaces are damaged, the sealing surfaces are repaired by manual polishing or grinding; if the manual repair cannot be carried out, replacing the hydraulic driving pipe and reinstalling;
5) the testing oil pressure is increased, and the steps 3) and 4) are repeated until the output oil pressure of the mobile hydraulic pump truck is increased to 250bar, and no leakage is generated in the leakage detecting hole;
6) and (4) dismantling the pumping pressure tool, and transferring to the next hydraulic drive pipeline to perform a pumping pressure test until the tightness test work of all the natural gas hydraulic drive pipelines of the diesel engine is completed.
4. A device for testing the tightness of a natural gas hydraulic driving pipeline of a diesel engine for realizing the testing method of claim 1 is characterized in that: the testing device is a pumping pressure tool, a hydraulic oil channel is arranged in the pumping pressure tool and is communicated with the upper surface of the pumping pressure tool through a quick interface, the lower surface of the pumping pressure tool is a sealed spherical surface, the pumping pressure tool is fixedly connected to the distribution block of the gas hydraulic driving pipeline through a connecting bolt, and the pumping pressure tool is in close contact with the distribution block by means of the sealed spherical surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910997399.8A CN110702316A (en) | 2019-10-21 | 2019-10-21 | Device and method for testing tightness of natural gas hydraulic drive pipeline of diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910997399.8A CN110702316A (en) | 2019-10-21 | 2019-10-21 | Device and method for testing tightness of natural gas hydraulic drive pipeline of diesel engine |
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| CN110702316A true CN110702316A (en) | 2020-01-17 |
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| CN201910997399.8A Withdrawn CN110702316A (en) | 2019-10-21 | 2019-10-21 | Device and method for testing tightness of natural gas hydraulic drive pipeline of diesel engine |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114034449A (en) * | 2021-11-02 | 2022-02-11 | 上海中船三井造船柴油机有限公司 | Device and method for checking tightness of gas inlet valve |
| CN115194684A (en) * | 2022-07-20 | 2022-10-18 | 中国船舶重工集团柴油机有限公司 | Gas valve positioning tool and positioning method |
| CN116929649A (en) * | 2023-09-18 | 2023-10-24 | 邹城市巨力机械有限公司 | Hydraulic oil leak detection device for sheet metal hydraulic tool |
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| CN202101830U (en) * | 2011-06-02 | 2012-01-04 | 广东省韶关钢铁集团有限公司 | Mobile hydraulic oil cylinder leak tester |
| US20150211952A1 (en) * | 2014-01-30 | 2015-07-30 | Ford Global Technologies, Llc | Cleaning cycle for capless refueling neck |
| CN109186893A (en) * | 2018-10-19 | 2019-01-11 | 安庆中船柴油机有限公司 | A kind of fuel oil double-wall pipe leak detecting device and detection method |
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2019
- 2019-10-21 CN CN201910997399.8A patent/CN110702316A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202101830U (en) * | 2011-06-02 | 2012-01-04 | 广东省韶关钢铁集团有限公司 | Mobile hydraulic oil cylinder leak tester |
| US20150211952A1 (en) * | 2014-01-30 | 2015-07-30 | Ford Global Technologies, Llc | Cleaning cycle for capless refueling neck |
| CN109186893A (en) * | 2018-10-19 | 2019-01-11 | 安庆中船柴油机有限公司 | A kind of fuel oil double-wall pipe leak detecting device and detection method |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114034449A (en) * | 2021-11-02 | 2022-02-11 | 上海中船三井造船柴油机有限公司 | Device and method for checking tightness of gas inlet valve |
| CN115194684A (en) * | 2022-07-20 | 2022-10-18 | 中国船舶重工集团柴油机有限公司 | Gas valve positioning tool and positioning method |
| CN115194684B (en) * | 2022-07-20 | 2023-10-27 | 中船发动机有限公司 | Gas valve positioning tool and positioning method |
| CN116929649A (en) * | 2023-09-18 | 2023-10-24 | 邹城市巨力机械有限公司 | Hydraulic oil leak detection device for sheet metal hydraulic tool |
| CN116929649B (en) * | 2023-09-18 | 2023-11-28 | 邹城市巨力机械有限公司 | Hydraulic oil leak detection device for sheet metal hydraulic tool |
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Application publication date: 20200117 |