A test method for the sealing performance of a marine diesel engine combustion chamber

Abstract

The present invention discloses a method for testing the sealing of a combustion chamber of a marine diesel engine. The method is implemented by using a testing device for testing the sealing of a combustion chamber of a marine diesel engine. The testing device comprises a plug and a joint. The joint is provided with a detection element for detecting the sealing of the combustion chamber and a connection mechanism for installation with the combustion chamber. The plug is provided with a fastening mechanism for fitting with the combustion chamber. A connecting pipe and a conduit are provided in the plug, and the connecting pipe and the conduit are slidably connected. A fixing seat is provided in the plug, a partition piece is provided on the fixing seat, a groove for sliding the partition piece is provided on the conduit, a partition plate with two holes is provided in the conduit, and the partition piece and the two holes of the partition plate are rotatably closed. The present invention seals the combustion chamber of a diesel engine, so that the combustion chamber has a good detection effect. In addition, the device of the present invention is easy to adjust and convenient to implement.

Description

Technical Field

[0001] The invention relates to the technical field of diesel engine testing equipment, and in particular to a method for testing the sealing performance of a combustion chamber of a marine diesel engine. Background Art

[0002] As the heart of a ship, the marine diesel engine is crucial to its navigational safety. Comprehensive testing is required before leaving the factory to ensure that each marine diesel engine has excellent performance. Testing marine diesel engines is an important step in the entire marine diesel engine production process, and it is also an important step in determining whether a marine diesel engine meets standards.

[0003] In the existing technology, the sealing of the combustion chamber of a marine diesel engine is tested mainly by injecting gas to measure the change in the air pressure difference in the combustion chamber. During the measurement process, the diesel engine combustion chamber needs to be sealed, and gas is injected into the combustion chamber and measured in a sealed environment. However, the installation of the sealing equipment is relatively complicated and prone to leakage, resulting in poor test results. For this reason, we propose a test method for the sealing of the combustion chamber of a marine diesel engine. Summary of the Invention

[0004] The purpose of the present invention is to reduce the impact of the above situation and provide a method for testing the sealing performance of a combustion chamber of a marine diesel engine.

[0005] To achieve the above objectives, the present invention adopts the following technical solutions: a method for testing the sealing performance of a marine diesel engine combustion chamber, implemented using a marine diesel engine combustion chamber sealing performance testing device, the testing device comprising a cannula and a joint, the joint being provided with a detection element for detecting the sealing performance of the combustion chamber and a connection mechanism for mounting with the combustion chamber, the cannula being provided with a fastening mechanism for fitting with the combustion chamber;

[0006] The cannula is provided with a connecting tube and a catheter, and the connecting tube is slidably connected to the catheter. The cannula is provided with a fixing seat, and a partition piece is provided on the fixing seat. The catheter is provided with a groove for sliding the partition piece. The catheter is provided with a partition plate with two holes, and the partition piece and the two holes of the partition plate are rotated and closed.

[0007] The test method comprises the following steps:

[0008] Step S1: inserting the connectors of the test device into the air inlet and air outlet of the combustion chamber of the marine diesel engine respectively, and achieving sealing and fixing of the test device and the air inlet and air outlet of the combustion chamber through a connecting mechanism and a fastening mechanism;

[0009] Step S2: By adjusting the connection mechanism, connecting the insert tube and the combustion chamber, pressurizing the combustion chamber by inflation, and performing sealing tests in the static, dynamic and combustion states of the combustion chamber respectively, the inspection is completed.

[0010] Preferably, a first handle is provided on the connecting tube, and an adjustment slot for adjusting the first handle is provided on the insertion tube.

[0011] Preferably, the connection mechanism includes a plurality of connection plates provided on the conduit, and the plurality of connection plates are all transmission-connected with rotating blades, and the rotating blades are rotationally connected to the joint.

[0012] Preferably, a sealing sheet is provided in the joint, a plurality of air bags are provided on the sealing sheet, and the plurality of air bags are connected to one of the holes.

[0013] Preferably, the fastening mechanism includes a fixed frame and a sliding frame, the fixed frame is provided with a limiting outer cylinder, the sliding frame is provided with a limiting inner cylinder sliding with the limiting outer cylinder, a spring is provided between the sliding frame and the fixed frame, and the sliding frame is provided with a second handle passing through the fixed frame.

[0014] Preferably, step S1 specifically comprises inserting the connector of the test device into the air inlet and the air outlet of the marine diesel engine combustion chamber respectively, and elastically compressing the sliding frame, and then rotating the first handle along the adjustment groove to rotate the guide tube, thereby driving the rotating blade to rotate, so that the rotating blade and the sliding frame clamp the marine diesel engine combustion chamber, completing the fixation of the test device and the air inlet and outlet of the combustion chamber. At the same time, during the rotation of the guide tube, the partition piece moves to open the hole of the air bag, and then gas is injected into the air bag, so that the air bag seals the air inlet and outlet of the combustion chamber;

[0015] Specifically, step S2 comprises adjusting the first handle so that the rotating blade is retracted, the conduit and the airbag are closed, the partition plate is moved to open the hole of the combustion chamber, and the combustion chamber is pressurized by inflation, and sealing tests are performed in the static, dynamic and combustion states of the combustion chamber to complete the inspection.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The device of the present invention seals the combustion chamber of the diesel engine, so that the combustion chamber has a good detection effect, and the device of the present invention is easy to adjust and easy to implement.

[0018] 2. The connection mechanism and the fastening mechanism of the present invention are positioned in coordination, so that the device can be installed on the combustion chamber, which is easy to operate.

[0019] 3. The present invention tests the combustion chamber of a diesel engine by combining static testing, dynamic testing and combustion testing, thereby improving the detection effect of the combustion chamber sealing, avoiding the uncertainty of the results, and eliminating problems in the test at each step.

[0020] 4. The combustion chamber test of the diesel engine according to the present invention is simple to operate, the test results are easy to observe, and the reliability is high.

[0021] 5. The present invention has low testing cost, reasonable design and is easy to implement. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a front perspective view of a method for testing the sealing performance of a combustion chamber of a marine diesel engine according to the present invention;

[0023] Figure 2 A cross-sectional view of a fastening mechanism of a method for testing the sealing performance of a combustion chamber of a marine diesel engine according to the present invention;

[0024] Figure 3 A cross-sectional view of an intubation tube in a method for testing the sealing performance of a combustion chamber of a marine diesel engine according to the present invention;

[0025] Figure 4 A cross-sectional view of a joint in a method for testing the sealing performance of a combustion chamber of a marine diesel engine according to the present invention;

[0026] Figure 5 The present invention is a cross-sectional view of a fixing seat used in a method for testing the sealing performance of a combustion chamber of a marine diesel engine.

[0027] In the figure: 1. Cannula; 11. Adjustment slot; 12. Catheter; 13. Connecting tube; 14. First handle; 15. Connecting plate; 16. Fixed seat; 17. Partition plate; 18. Partition plate; 2. Fixed frame; 21. Limit outer cylinder; 22. Sliding frame; 23. Limit inner cylinder; 24. Spring; 25. Second handle; 3. Joint; 31. Airbag; 32. Rotating blade; 33. Sealing plate. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0029] See also Figure 1-5This embodiment provides a test device for the sealing performance of a marine diesel engine combustion chamber, including a cannula 1 and a joint 3. The joint 3 is provided with a detection element for detecting the sealing performance of the combustion chamber and a connection mechanism for mounting with the combustion chamber. The cannula 1 is provided with a fastening mechanism for fitting with the combustion chamber. When connecting, the joint 3 of the test device is inserted into the air inlet and air outlet of the marine diesel engine combustion chamber, respectively, and the test device and the air inlet and air outlet of the combustion chamber are sealed and fixed by the connection mechanism and the fastening mechanism.

[0030] A connecting tube 13 and a conduit 12 are provided in the cannula 1, and the connecting tube 13 is slidably connected to the conduit 12. A fixing seat 16 is provided in the cannula 1, and a partition piece 17 is provided on the fixing seat 16. A groove for the sliding of the partition piece 17 is provided on the conduit 12. A partition plate 18 with two holes is provided in the conduit 12, and the two holes of the partition piece 17 and the partition plate 18 are rotated and closed. During the test, the cannula 1 and the combustion chamber are connected by adjusting the connecting mechanism, and the combustion chamber is pressurized by inflation. The sealing test is carried out in the static, dynamic and combustion states of the combustion chamber respectively to complete the test.

[0031] A first handle 14 is provided on the connecting tube 13 , and an adjustment slot 11 for adjusting the first handle 14 is provided on the cannula 1 , so as to facilitate adjustment of the opening direction of the partition 18 and facilitate gas filling and pressurization work.

[0032] The connecting mechanism includes a plurality of connecting plates 15 arranged on the catheter 12, each of which is transmission-connected with a rotating leaf 32, and the rotating leaf 32 is rotationally connected to the joint 3. A sealing plate 33 is provided in the joint 3, and a plurality of airbags 31 are provided on the sealing plate 33, and the plurality of airbags 31 are connected to one of the holes.

[0033] The device is installed along the combustion chamber of a diesel engine. Connector 3 is inserted into the combustion chamber through cannula 1. Gas is then injected into cannula 1 through connecting tube 13. The first handle 14 is rotated along adjustment slot 11, causing conduit 12 to rotate, thereby driving rotating blade 32 to rotate and prevent connector 3 from detaching from the combustion chamber. Conduit 12 is now connected to airbag 31. Conduit 12 is simultaneously rotated along fixing seat 16, causing partition plate 17 to move and open the hole in airbag 31. Gas is then injected into airbag 31, causing it to seal the inlet and outlet of the combustion chamber. The first handle 14 is then adjusted to retract rotating blade 32, closing conduit 12 and airbag 31. Partition plate 17 moves and opens the hole in the combustion chamber, and the combustion chamber is pressurized by inflation. After the operation is completed, the combustion chamber is depressurized, and the airbag 31 is also depressurized.

[0034] After the airbag 31 is deployed, the sliding frame 22 and the airbag 31 clamp the combustion chamber to ensure the stability of the equipment connection. After the inspection work is completed, the sliding frame 22 can be released from the clamping state by pulling the second handle 25.

[0035] The fastening mechanism includes a fixed frame 2 and a sliding frame 22. A limiting outer cylinder 21 is provided on the fixed frame 2, and a limiting inner cylinder 23 sliding with the limiting outer cylinder 21 is provided on the sliding frame 22. A spring 24 is provided between the sliding frame 22 and the fixed frame 2, and a second handle 25 passing through the fixed frame 2 is provided on the sliding frame 22.

[0036] A method for testing the sealing performance of a combustion chamber of a marine diesel engine, the method comprising the following steps:

[0037] Step S1: Insert the connector 3 of the test device into the air inlet and air outlet of the marine diesel engine combustion chamber respectively, and elastically compress the sliding frame 22. Then, the first handle 14 is rotated along the adjustment slot 11 to rotate the guide tube 12, thereby driving the rotating blade 32 to rotate. The rotating blade 32 and the sliding frame 22 clamp the marine diesel engine combustion chamber, completing the fixation of the test device and the air inlet and outlet of the combustion chamber. At the same time, during the rotation of the guide tube 12, the partition plate 17 moves to open the hole of the air bag 31. Then, gas is injected into the air bag 31, so that the air bag 31 seals the air inlet and outlet of the combustion chamber.

[0038] Step S2: Adjust the first handle 14 so that the rotating blade 32 is retracted, the conduit 12 and the airbag 31 are closed, the partition plate 17 moves to open the hole of the combustion chamber, and the combustion chamber is pressurized by inflation. The sealing test of the combustion chamber is performed in the static, dynamic and combustion states respectively to complete the inspection.

[0039] In the static test, the air pressure is injected to a stable state, and then the pressurization is stopped. The air pressure in the combustion chamber is measured within a unit time. If the air pressure is within the standard range, the static test is completed. The stable pressure state in the static test is when the piston is at the lowest position of the combustion chamber stroke at an air pressure of 5.85-10MPa.

[0040] In the dynamic test, the combustion chamber pressure is reduced to a low-pressure state, after which the connecting rod crankshaft mechanism drives the piston to perform 20-100 reciprocating motions. The combustion chamber pressure at this time is measured within a unit time. If the pressure is within the standard range, the dynamic test is completed. This test ensures that there is no significant wear and tear in the combustion chamber during the working stroke and guarantees the sealing of the combustion chamber. The pressure in the low-pressure state is 0.125-0.155MPa. At the end of the reciprocating motion, the piston is at the lowest position of the combustion chamber stroke.

[0041] Combustion test: After the diesel engine is sealed and assembled, the diesel engine is started and the combustion chamber performs a four-stroke operation; the diesel engine is then stopped, the combustion chamber is allowed to cool to room temperature, and the above-mentioned static test is performed; the changes in the air pressure in the combustion chamber over time are measured, and the combustion operation ensures that the high-temperature combustion does not damage the combustion chamber and prevents damage to the combustion chamber after combustion operation; the specific characteristics of the static test are: the exhaust gas outlet and air inlet of the combustion chamber to be tested are sealed, and air pressure is injected to a stable state, and then pressurization is stopped, while the piston is at the maximum stroke position of the combustion chamber, where the maximum stroke includes the piston being at the lowest position of the combustion chamber and the piston being at the highest position of the combustion chamber;

[0042] Through the above-mentioned static test, dynamic test and combustion test, the sealing performance is tested to be qualified in three states, that is, the sealing performance of the combustion chamber is determined to be qualified.

[0043] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for testing the sealing performance of a combustion chamber of a marine diesel engine, implemented using a test device for the sealing performance of a combustion chamber of a marine diesel engine, characterized in that: The test device comprises a cannula (1) and a joint (3), wherein the joint (3) is provided with a detection element for detecting the sealing of the combustion chamber and a connection mechanism for mounting with the combustion chamber, and the cannula (1) is provided with a fastening mechanism for fitting with the combustion chamber; The cannula (1) is provided with a connecting tube (13) and a catheter (12), and the connecting tube (13) is slidably connected to the catheter (12). The cannula (1) is provided with a fixing seat (16), and a partition plate (17) is provided on the fixing seat (16). The catheter (12) is provided with a groove for sliding the partition plate (17). The catheter (12) is provided with a partition plate (18) with two holes, and the partition plate (17) and the two holes of the partition plate (18) are rotatably closed. The test method comprises the following steps: Step S1: inserting the connector (3) of the test device into the air inlet and the air outlet of the marine diesel engine combustion chamber respectively, and achieving sealing and fixing of the test device and the air inlet and the air outlet of the combustion chamber through a connecting mechanism and a fastening mechanism; Step S2: by adjusting the connection mechanism, connecting the insert tube (1) and the combustion chamber, pressurizing the combustion chamber by inflation, and performing sealing tests in the static, dynamic, and combustion states of the combustion chamber to complete the test; The connecting tube (13) is provided with a first handle (14), and the insertion tube (1) is provided with an adjustment slot (11) for adjusting the first handle (14); The connection mechanism comprises a plurality of connection pieces (15) arranged on the conduit (12), each of the plurality of connection pieces (15) being transmission-connected with a rotating blade (32), and the rotating blade (32) being rotationally connected to the joint (3); A sealing sheet (33) is provided in the joint (3), a plurality of air bags (31) are provided on the sealing sheet (33), and the plurality of air bags (31) are connected to one of the holes of the partition (18); The fastening mechanism comprises a fixed frame (2) and a sliding frame (22), wherein a limiting outer cylinder (21) is provided on the fixed frame (2), and a limiting inner cylinder (23) is provided on the sliding frame (22) and slides with the limiting outer cylinder (21), a spring (24) is provided between the sliding frame (22) and the fixed frame (2), and a second handle (25) is provided on the sliding frame (22) and passes through the fixed frame (2).

2. A method for testing the sealing performance of a marine diesel engine combustion chamber according to claim 1, characterized in that: Specifically, the step S1 includes inserting the connector (3) of the test device into the air inlet and the air outlet of the marine diesel engine combustion chamber, respectively, and elastically compressing the sliding frame (22), and then rotating the guide tube (12) along the adjustment groove (11) through the first handle (14), thereby rotating the rotating blade (32), thereby driving the rotating blade (32) to rotate, so that the rotating blade (32) and the sliding frame (22) clamp the marine diesel engine combustion chamber, completing the fixing of the test device and the air inlet and outlet of the combustion chamber, and at the same time, during the rotation of the guide tube (12), the partition plate (17) moves to open the hole of the air bag (31), and then injecting gas into the air bag (31), so that the air bag (31) seals the air inlet and outlet of the combustion chamber; Specifically, step S2 comprises adjusting the first handle (14) so ​​that the rotating blade (32) is retracted, the guide tube (12) and the airbag (31) are closed, the partition plate (17) moves to open the hole of the combustion chamber, and the combustion chamber is pressurized by inflation, and the sealing test is performed in the static, dynamic and combustion states of the combustion chamber respectively to complete the test.

Images