Test tool and method for airtightness test of fuel gas control block of marine dual-fuel diesel engine

Abstract

The invention discloses a test tool and method for a gas tightness test of a fuel gas control block of a marine dual-fuel diesel engine. The tool comprises core components such as an adaptive flange, a silencer, a ball valve assembly, a sealing assembly and a thin film pressure accumulator, and a traditional chain pipe system is replaced through innovative modular design. The adaptive flange is integrated with a multi-path oil hole system, comprises a high-pressure oil supply hole, a low-pressure oil supply hole, a sealing oil hole and a fuel gas supply hole, and is matched with a special sealing structure to realize efficient sealing. The test method adopts a graded pressure test which comprises a low-pressure oil test, a high-pressure oil test, a sealing oil test and a fuel gas test, and the test accuracy is ensured by accurately controlling pressure parameters and dwell time. The problems that a traditional testing method is complex in installation, low in efficiency and the like are solved, the testing time is shortened by 73% or above, the sealing detection precision reaches the level of 1 * 10 <-6 > mbar.L / s, the testing safety and reliability are remarkably improved, and the method is suitable for airtightness detection of fuel gas control blocks of various marine dual-fuel engines.

Description

Technical Field

[0001] The present invention relates to the field of gas system testing for marine dual-fuel diesel engines, and particularly to a test tooling and method for airtightness testing of a gas control block for a marine dual-fuel diesel engine, which is used to replace a normal adapter and chain pipe during the airtightness testing of a single cylinder of the dual-fuel diesel engine, so as to quickly and accurately complete the single-cylinder airtightness testing. Background Art

[0002] Marine dual-fuel diesel engines can operate in two fuel modes: fuel oil and gas. For dual-fuel diesel engines, the airtightness of the gas system is particularly important. Once gas leakage occurs, it is very likely to cause irreparable losses. Therefore, it is necessary to conduct airtightness tests on the gas components of each cylinder of the dual-fuel diesel engine. In order to conduct airtightness tests on the gas components, first, the gas control block, window valve, and gas injection valve need to be installed on the cylinder head according to the installation requirements. Among them, the gas control block needs to be connected to gas components such as its matching adapter and chain pipe for airtightness testing.

[0003] If airtightness testing is carried out after the installation of gas components such as the gas control block, window valve, and chain pipe, the following problems exist:

[0004] 1. The technical requirements for the installation process of gas components such as the gas control block, window valve, and chain pipe are high. The installation process involves complex operation steps and specific process requirements, and the operation is cumbersome.

[0005] 2. After the installation of gas components such as the gas control block, window valve, and chain pipe is completely completed, the floor area occupied is huge, which is not convenient for on-site construction. Moreover, airtightness tests need to be carried out on the gas control block of each cylinder, and the chain pipe needs to be continuously adjusted to meet the single-cylinder airtightness requirements. Improper operation will have an adverse impact on both the safety and accuracy of the single-cylinder airtightness test.

[0006] 3. For the cylinder head equipped with gas components such as the gas control block, window valve, and chain pipe, after the airtightness test, it cannot be hoisted as a whole for installation. It needs to be disassembled and then installed according to the diesel engine installation process to complete the installation of the whole machine, resulting in repeated disassembly and assembly.

[0007] Currently, no description or report of similar technologies to the present invention has been found, and no similar materials at home and abroad have been collected either. Summary of the Invention

[0008] In view of the above deficiencies in the prior art, the present invention provides a test tooling and method for airtightness testing of a gas control block for a marine dual-fuel diesel engine.

[0009] A test tooling for airtightness testing of a gas control block for a marine dual-fuel diesel engine is characterized by including:

[0010] [[ID=

[0011] Four first threaded holes evenly distributed on the upper end face for bolt connection with the gas control block (102);

[0012] Four second threaded holes evenly distributed circumferentially on the outside for installing lifting ring screws (10);

[0013] A third threaded hole provided on the left end face for connecting the diaphragm accumulator (13);

[0014] A fourth threaded hole provided on the rear end face for connecting the ball valve assembly (5);

[0015] A pipe interface provided on the lower end face for connecting the three-way cock (11);

[0016] A gas detection hole (21) provided on the side end face, and a detachable plug (6) is configured at its outer port;

[0017] A sealing oil hole (22), an oil drain hole (23), a high-pressure oil supply hole (24), a low-pressure oil supply hole (25) and a gas supply hole (26) are further provided on the lower end face; the high-pressure oil supply hole (24) has a T-shaped structure, its first port is connected to the pump pressure equipment, and the second port communicates with the diaphragm accumulator (13); the sealing oil hole (22) and the low-pressure oil supply hole (25) have an L-shaped structure, its first port is connected to the pump pressure equipment, and the second port communicates with the ball valve assembly (5); the gas supply hole (26) has a T-shaped structure, its first port is connected to the pump pressure equipment, and the second port communicates with the gas control block (102).

[0018] Further, the gas detection hole (21) is connected to the gas supply hole (26) through an internal channel to form a detection passage.

[0019] Further, it further includes:

[0020] A silencing device, which is composed of a reducing joint (3), a muffler (4) and a three-way cock (11) connected in sequence;

[0021] A sealing assembly, including a sealing ring (7), a sealing gasket (8) and a square-section sealing gasket (9) arranged between the adapter flange (2) and the gas control block (102).

[0022] Further, the working pressure range of the high-pressure oil supply hole (24) is 0 - 320 bar, and the hole diameter tolerance is ±0.01 mm.

[0023] An airtightness test method using the above test tooling, characterized by including the following steps:

[0024] S1. Installation preparation:

[0025] Connect the gas control block (102) and the adapter flange (2) with bolts, and the tightening torque is 80 - 100 N·m;

[0026] Check the installation status of the sealing ring (7), the sealing gasket (8) and the square-section sealing gasket (9);

[0027] S2. Pipeline connection:

[0028] Connect the high-pressure oil circuit of the pump pressure equipment with the high-pressure oil supply hole (24);

[0029] Connect the low-pressure oil circuit of the pump pressure equipment with the low-pressure oil supply hole (25);

[0030] Connect the sealing oil circuit of the pump pressure equipment with the sealing oil hole (22);

[0031] Connect the gas pipeline of the pump pressure equipment with the gas supply hole (26);

[0032] S3. Step-by-step pressure test:

[0033] a) Low-pressure oil test: Stabilize the pressure to 5 ± 0.1 bar, hold the pressure for 5 minutes, and the pressure drop ≤ 0.75 bar is qualified;

[0034] b) High-pressure oil test: Stabilize the pressure to 300 ± 1 bar, hold the pressure for 5 minutes, and the pressure drop ≤ 0.75 bar is qualified;

[0035] c) Sealing oil test: Stabilize the pressure to 320 ± 1 bar, hold the pressure for 5 minutes, and the pressure drop ≤ 0.75 bar is qualified;

[0036] d) Gas test: Gradually increase the pressure by 50 bar increments to 300 ± 1 bar, stabilize the pressure for 30 - 60 seconds at each stage, and finally hold the pressure for 5 minutes. The pressure drop ≤ 0.75 bar is qualified.

[0037] Furthermore, in the gas test of step S3, when abnormal pressure is detected, the following operations are automatically performed: Cut off the oil circuit within 0.5 seconds through the ball valve assembly (5);

[0038] Start the silencing device composed of the reducer (3), the silencer (4) and the three-way cock (11);

[0039] Trigger the audible and visual alarm signal.

[0040] A computer-readable storage medium, on which a computer program is stored, characterized in that when the program is executed by a processor, it realizes the automatic control of the above airtight test method, including:

[0041] Real-time acquisition and processing of pressure data;

[0042] Automatic sequential control of the test process;

[0043] Automatic judgment and handling of abnormal situations;

[0044] Automatic generation of test reports.

[0045] Compared with the prior art, the present invention has the following beneficial effects:

[0046] When using the adapter flange for the airtightness test, the gas control block does not need to be installed with the chain pipe. The adapter flange can replace the normal adapter and the chain pipe to complete the airtightness test of the gas control block, thereby reducing the workload of the test, improving the work effect, effectively reducing the complex operation steps and specific process requirements involved in the installation process, and then reducing the difficulty of the test preparation stage and the installation difficulty.

[0047] It is possible to perform the airtightness test on each cylinder separately without being associated with other components, simplifying the airtightness test process and effectively avoiding the steps of continuously adjusting the chain pipe to meet the airtightness requirements of a single cylinder, thereby ensuring the safety and accuracy of the airtightness test.

[0048] After the airtightness test is completed, it is possible to hoist and install each cylinder separately, and it has the characteristics of simple structure, easy operation, and convenient use.

[0049] It meets the airtightness test requirements of the gas control block. Thus, it is simpler, faster, and more accurate to complete the airtightness test work of the gas block of a marine dual-fuel low-speed diesel engine, reducing the repeated disassembly and assembly work of the remaining components caused thereby, and then achieving the effect of saving manpower and material resources.

[0050] The test tooling for the airtightness test of the gas control block of the present invention in a dual-fuel diesel engine fills the blank of the test tooling and method for the airtightness test of the gas control block of the existing marine ME-type dual-fuel low-speed diesel engine, improving the work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] By reading the detailed description of the non-restrictive embodiments with reference to the following drawings, other features, objects, and advantages of the present invention will become more apparent:

[0052] Figure 1 It is a schematic structural diagram of the test tooling for the airtightness test of the gas control block of the marine dual-fuel diesel engine of the present invention;

[0053] Figure 2 It is a side view of the test tooling for the airtightness test of the gas control block of the marine dual-fuel diesel engine of the present invention;

[0054] Figure 3 It is a schematic cross-sectional structure diagram of the adapter flange of the present invention;

[0055] Figure 4Schematic diagram of the opening of the flange adapted to the present invention;

[0056] Figure 5 Schematic diagram of the installation of the test tooling for the airtightness test of the gas control block of the present invention;

[0057] In the figure: 1. Adapter flange; 2. Adapted flange; 3. Reducing joint; 4. Silencer; 5. Ball valve assembly; 6. Plug; 7. Sealing ring; 8. Sealing gasket; 9. Square-section sealing gasket; 10. Lifting eye screw; 11. Three-way cock; 12. Pipe joint; 13. Membrane accumulator; 21. Gas detection hole; 22. Sealing oil hole; 23. Drain oil hole; 24. High-pressure oil supply hole; 25. Low-pressure oil supply hole; 26. Gas supply hole; 102. Gas control block; 103. Cylinder head; 104. Jet valve; 105. Control oil; 106. Test bench Detailed implementation mode

[0058] The embodiments of the present invention will be described in detail below: These embodiments are implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operation processes are given. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention.

[0059] As Figure 1 shown, a test tooling for the airtightness test of a gas control block of a marine dual-fuel diesel engine includes: an adapter flange 1, which is internally provided with an adapted flange 2, a reducing joint 3, a silencer 4, a ball valve assembly 5, a plug 6, a sealing ring 7, a sealing gasket 8, a square-section sealing gasket 9, a lifting eye screw 10, a three-way cock 11, a pipe joint 12, and a membrane accumulator 13; among them:

[0060] The upper end of the adapter flange 1 is connected to the gas control block 102, the upper end of the gas control block 102 is connected to the high-pressure control oil pipe 105, the rear end is connected to the cylinder head 103, the lower end of the cylinder head 103 is fixed on the test bench 106, the upper end is connected to the jet valve 104, and the jet valve 104 is connected to the high-pressure control oil pipe 105;

[0061] The adapted flange 2 is used to replace the conventional adapter and chain pipe during the airtightness test of the gas control block 102;

[0062] The reducing pipe joint 3, the silencer 4, and the three-way cock 11 together form a noise reduction device for reducing noise during the alarm in the airtightness test;

[0063] The ball valve assembly 5 is used for the leakage of high-pressure oil or low-pressure oil during the airtightness test;

[0064] The plug 6 is used to block the gas detection hole;

[0065] The seal ring 7, the sealing ring 8, and the square-section sealing ring 9 are used for sealing when the gas control block 102 is connected to the adapter flange 1;

[0066] The lifting ring screw 10 is used to lift the adapter flange 1;

[0067] The pipe joint 12 is used to connect to each test pipe system during the airtightness test;

[0068] The diaphragm accumulator 13 is used to stabilize the oil pressure in the oil circuit, absorb pressure, and buffer;

[0069] Under the working condition, first place the cylinder head fixedly on the test bench, install the jet valve on the cylinder head, then correctly install the gas control block on the cylinder head, then install one end of the control oil high-pressure pipe on the gas control block and the other end on the jet valve, and finally install the adapter flange at the lower end of the gas control block, and then conduct a single-cylinder airtightness test. During the test

[0070] The upper end of the adapter flange 2 is provided with four uniformly distributed threaded holes. The threaded holes of the adapter flange 2 are connected to the gas control block 102 through bolts. The outside of the adapter flange 2 is provided with 4 threaded holes for installing the lifting ring screws 10. In this embodiment, the four lifting ring screws 10 are uniformly distributed, which can lift and transport the distributor flange 1 smoothly and prevent damage due to lifting and transportation.

[0071] The left end of the adapter flange 2 is fixedly connected to the diaphragm accumulator 13 through bolts. The left end and the rear end of the adapter flange 2 are fixedly connected to the ball valve assembly 5 through bolts. The lower end of the adapter flange 2 is connected to the three-way cock 11 through a pipe connection. The three-way cock 11 is connected to the silencer 4 through a reducing joint 3. In this embodiment, when the airtightness test is carried out, the diaphragm accumulator 13 stabilizes the oil pressure to ensure that the internal structure of the adapter flange 2 will not be damaged due to excessive pressure during the airtightness test; the silencer 4 can reduce the noise when an alarm occurs due to excessive pressure during the airtightness test, preventing the test personnel from suffering hearing damage due to the noise during the test.

[0072] The lower end of the adapter flange 2 is provided with 6 sealing oil holes 22, drain oil holes 23, high-pressure oil supply holes 24, low-pressure oil supply holes 25, and gas supply holes 26 connected to the pipe system required for testing. The front end and the left end of the adapter flange 2 are respectively provided with gas detection holes 21. In this embodiment, in the early stage of preparing for the airtightness test, it should be ensured that the sealing oil holes 22, drain oil holes 23, high-pressure oil supply holes 24, low-pressure oil supply holes 25, and gas supply holes 26 in the adapter flange 2 are unobstructed and connected to the corresponding pipe systems used in the test.

[0073] On both side ends of the adaptor flange 2, there are gas detection holes 21, and at the outer opening, there is a plug 6 for sealing. The other end of the gas detection hole 21 communicates with the gas supply hole 26. When detecting gas, the plug 6 will be unscrewed for gas detection. At the lower end of the adaptor flange 2, there are oil drain holes 23, high-pressure oil supply holes 24, and gas supply holes 26. At the other end of the gas supply hole 26, there are a sealing ring 7, a sealing gasket 8, and a square-section sealing gasket 9 to strengthen the sealing. In this embodiment, during the airtightness test process, there are continuous pressure fluctuations. The sealing ring 7, the sealing gasket 8, and the square-section sealing gasket 9 strengthen the sealing between the adaptor flange 1 and the gas control block 102, preventing situations such as high-pressure air flow during the airtightness test, ensuring the safety of the test personnel and the accuracy of the test results.

[0074] The high-pressure oil supply hole 24 is arranged in a T shape. One end of the high-pressure oil supply hole 24 communicates with the pipe system required for testing through a pipe joint 12, and the other end communicates with the diaphragm accumulator 13. The sealing oil hole 22 and the low-pressure oil supply hole 25 are arranged in an L shape. The other ends of the sealing oil hole 22 and the low-pressure oil supply hole 25 both communicate with the ball valve assembly 5. The gas supply hole 26 is arranged in a T shape. One end of the gas supply hole 26 communicates with the pipe system required for testing through a pipe joint 12, and the other end communicates with the gas control block 102. In this embodiment, during the airtightness test process, the L-shaped and T-shaped through holes inside the adaptor flange 2 are regarded as the corresponding pipe systems during the test.

[0075] In the installation tooling and method provided in the above embodiment of the present invention, the sizes of the gas control block devices of dual-fuel diesel engines vary according to different engine models, and the actual sizes of different configurations are well-known in the art.

[0076] The test method for the airtightness test of the gas control block of a marine dual-fuel diesel engine includes the following steps:

[0077] S1. First, the cylinder head completes the pressure test, and the gas control block completes the oil flushing of the internal pipeline. It is necessary to ensure that the adaptor flange is aligned with the gas safety block, tighten the installation bolts according to the instructions, then install the cylinder head on the test bench, install the adaptor flange on the test bench, align and fasten the gas control block with the adaptor flange; it should be noted that all sealing surfaces are clean and free of scratches, and the bolts are tightened to the required torque.

[0078] S2. Then, connect the pump pressure equipment and each test pipe system to the adaptor flange to complete the connection between the gas functional components of the dual-fuel diesel engine and the adaptor flange;

[0079] S3. Then, the pump pressure equipment stabilizes the pressure of the low-pressure oil hole to 5 bar through the connecting pipe system, and the pressure drop is less than 0.75 bar every 5 minutes, which means the connection is qualified.

[0080] S4. Then, the pump pressure equipment stabilizes the pressure of the high-pressure oil hole to 300 bar through the connecting pipeline system, and the pressure drop is less than 0.75 bar every 5 minutes, which means the connection is qualified.

[0081] S5. Then, the pump pressure equipment stabilizes the pressure of the sealing oil hole to 320 bar through the connecting pipeline system, and the pressure drop is less than 0.75 bar every 5 minutes, which means the connection is qualified.

[0082] S6. Then, the pump pressure equipment gradually increases the pressure of the gas supply hole to 300 bar through the connecting pipeline system (every 50 bar, the pressure is stabilized for 30 s to 1 min until 300 bar). After the pressure is stabilized, the pressure drop is less than 0.75 bar every 5 minutes, which means the connection is qualified.

[0083] S7. Then, conduct other subsequent tests according to technical requirements.

[0084] S8. After all tests are completed, remove the adapter flange to complete other relevant installation work.

[0085] Example:

[0086] 1. Assembly of test tooling

[0087] (1) Horizontally place the adapter flange (2) on the installation platform and sequentially install the following components:

[0088] Install the diaphragm accumulator (13) through the third threaded hole at the left end, and the tightening torque is 60 ± 5 N·m

[0089] ] Install the ball valve assembly (5) through the fourth threaded hole at the rear end, and the tightening torque is 45 ± 5 N·m. Install the three-way cock (11) at the lower pipe interface and connect the reducing joint (3) and the silencer (4)

[0090] (2) Installation of sealing components:

[0091] Sequentially install on the upper end face of the adapter flange (2):

[0092] Square-section sealing ring (9) (specification Φ120×5 mm)

[0093] Sealing ring (7) (material: fluororubber)

[0094] O-ring (8) (standard: GB3452.1)

[0095] (3) Installation of lifting components:

[0096] Install the lifting ring screws (10) in the four second threaded holes, and the pre-tightening torque is 30 N·m

[0097] 2. Connection of test system

[0098] (1) Pipeline connection:

[0099] The high-pressure oil supply hole (24) T-port A is connected to the high-pressure oil circuit of the pump pressure equipment (DN8 stainless steel pipe). The low-pressure oil supply hole (25) L-port A is connected to the low-pressure oil circuit of the pump pressure equipment (DN6 stainless steel pipe). The sealing oil hole (22) L-port A is connected to the sealing oil circuit of the pump pressure equipment (DN6 stainless steel pipe). The gas supply hole (26) T-port A is connected to the gas supply system (DN10 stainless steel pipe).

[0100] (2) Detection system connection:

[0101] The gas detection hole (21) is installed with a pressure sensor (range 0 - 350 bar, accuracy class 0.5). Pressure transmitters (accuracy 0.1% FS) are installed at each oil circuit interface.

[0102] 3. Airtight test operation procedure

[0103] (1) Pre-test inspection:

[0104] Check that the roughness of all sealing surfaces ≤ Ra1.6

[0105] Confirm that the bolt tightening torque meets the standard (re-check with a torque wrench).

[0106] Conduct a pre-inspection of the system airtightness (introduce 5 bar of nitrogen and hold the pressure for 3 minutes).

[0107] (2) Graded pressure test:

[0108] 1) Low-pressure oil test stage:

[0109] Increase the pressure to 5 bar at a rate of 1 bar / s

[0110] Hold the pressure for 5 minutes. A pressure drop ≤ 0.75 bar is considered qualified.

[0111] The test temperature is controlled at 20 ± 5 °C

[0112] 2) High-pressure oil test stage:

[0113] Increase the pressure to 300 bar at a rate of 5 bar / s

[0114] Hold the pressure for 5 minutes. A pressure drop ≤ 0.75 bar is considered qualified.

[0115] Monitor the pressure fluctuation of the diaphragm accumulator (13) in real time ≤ ±1%

[0116] 3) Sealing oil test stage:

[0117] Increase the pressure to 320 bar at a rate of 5 bar / s

[0118] Hold the pressure for 5 minutes. A pressure drop ≤ 0.75 bar is considered qualified.

[0119] Monitor the deformation of the square cross-section sealing ring (9) ≤ 0.1 mm

[0120] 4) Gas testing stage:

[0121] Gradually increase the pressure in 50 bar increments, stabilize the pressure for 30 - 60 seconds at each stage, with a final pressure of 300 bar, and hold the pressure for 5 minutes

[0122] The pressure drop ≤ 0.75 bar is qualified

[0123] Use a helium mass spectrometer to detect the leakage rate ≤ 1×10 -6 mbar·L / s

[0124] (3) Abnormal handling:

[0125] When the following situations occur, the protection is automatically triggered:

[0126] The pressure fluctuation exceeds the set value by ±5%

[0127] The pressure increase rate is abnormal (> 10 bar / s)

[0128] The temperature exceeds 50 °C

[0129] The protection actions include:

[0130] 1) The ball valve assembly (5) cuts off the oil circuit within 0.3 seconds

[0131] 2) The silencing device starts to reduce noise (noise ≤ 85 dB)

[0132] 3) The system automatically relieves pressure (rate 20 bar / s).

[0133] Application example

[0134] Take the MAN B&W 6S50ME-C9.5 type dual-fuel engine as an example:

[0135] (1) Test parameters:

[0136] Gas control block model: GVU-50

[0137] Test medium: Nitrogen (purity 99.99%)

[0138] Ambient temperature: 22 °C

[0139] Relative humidity: 45%

[0140] (2) Test results:

[0141] 1) Low-pressure oil test:

[0142] Initial pressure: 5.02 bar

[0143] After 5 minutes: 4.89 bar

[0144] Pressure drop: 0.13 bar

[0145] 2) High-pressure oil test:

[0146] Initial pressure: 300.5 bar

[0147] After 5 minutes: 299.8 bar

[0148] Pressure drop: 0.7 bar

[0149] 3) Seal oil test:

[0150] Initial pressure: 320.3 bar

[0151] After 5 minutes: 319.7 bar

[0152] Pressure drop: 0.6 bar

[0153] 4) Gas test:

[0154] Final pressure: 300.2 bar

[0155] After 5 minutes: 299.6 bar

[0156] Pressure drop: 0.6 bar

[0157] Helium leak rate: 8×10 -7 mbar·L / s

[0158] (3) Man-hour comparison:

[0159] Traditional method: 6 hours and 15 minutes

[0160] Method of the present invention: 1 hour and 40 minutes, with 73% efficiency improvement

[0161] Matters not covered in the above embodiments of the present invention are all well-known technologies in the art.

[0162] The specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various deformations or modifications within the scope of the claims, which do not affect the essence of the present invention.

Claims

1. A test tool for the airtight test of a gas control block of a marine dual-fuel diesel engine, characterized in that Comprising: An adapter flange (2) provided with: Four first threaded holes evenly distributed on the upper end face for bolt connection with the gas control block (102); Four second threaded holes evenly distributed circumferentially on the outer side for installing lifting eye screws (10); A third threaded hole provided on the left end face for connecting the diaphragm accumulator (13); A fourth threaded hole provided on the rear end face for connecting the ball valve assembly (5); A pipe interface provided on the lower end face for connecting the three-way cock (11); A gas detection hole (21) provided on the side end face, and a detachable plug (6) is configured at its outer port; The lower end face is further provided with a seal oil hole (22), an oil drain hole (23), a high-pressure oil supply hole (24), a low-pressure oil supply hole (25) and a gas supply hole (26); the high-pressure oil supply hole (24) has a T-shaped structure, its first port is connected to the pump pressure equipment, and its second port communicates with the diaphragm accumulator (13); the seal oil hole (22) and the low-pressure oil supply hole (25) have an L-shaped structure, their first ports are connected to the pump pressure equipment, and their second ports communicate with the ball valve assembly (5); the gas supply hole (26) has a T-shaped structure, its first port is connected to the pump pressure equipment, and its second port communicates with the gas control block (102).

2. The test tooling for the airtight test of the gas control block of the marine dual-fuel diesel engine according to claim 1, characterized in that The gas detection hole (21) is connected to the gas supply hole (26) through an internal channel to form a detection passage.

3. The test tooling for the airtight test of the gas control block of the marine dual-fuel diesel engine according to claim 1 or 2, characterized in that, Also comprising: A silencing device composed of a reducing joint (3), a silencer (4) and a three-way cock (11) connected in sequence; A sealing assembly including a sealing ring (7), a sealing gasket (8) and a square-section sealing gasket (9) provided between the adapter flange (2) and the gas control block (102).

4. The test tooling for the airtightness test of the gas control block of the marine dual-fuel diesel engine according to claim 1, characterized in that, The working pressure range of the high-pressure oil supply hole (24) is 0 - 320 bar, and the hole diameter tolerance is ±0.01 mm.

5. An airtight test method using the test tooling according to any one of claims 1-4, characterized in that, Including the following steps: S1. Installation preparation: Connect the gas control block (102) and the adapter flange (2) by bolts, and the tightening torque is 80 - 100 N·m; Check the installation status of the sealing ring (7), the sealing gasket (8) and the square-section sealing gasket (9); S2. Pipeline connection: Connect the high-pressure oil circuit of the pump pressure equipment to the high-pressure oil supply hole (24); Connect the low-pressure oil circuit of the pump pressure equipment to the low-pressure oil supply hole (25); Connect the sealing oil circuit of the pump pressure equipment to the seal oil hole (22); Connect the gas pipeline of the pump pressure equipment to the gas supply hole (26); S3. Step-by-step pressure test: a) Low-pressure oil test: Stabilize the pressure to 5 ± 0.1 bar, keep the pressure for 5 minutes, and the pressure drop ≤ 0.75 bar is qualified; b) High-pressure oil test: Stabilize the pressure to 300 ± 1 bar, keep the pressure for 5 minutes, and the pressure drop ≤ 0.75 bar is qualified; c) Seal oil test: Stabilize the pressure to 320 ± 1 bar, keep the pressure for 5 minutes, and the pressure drop ≤ 0.75 bar is qualified; d) Gas test: Gradually increase the pressure step by step in 50 bar increments to 300 ± 1 bar, stabilize the pressure for 30 - 60 seconds at each stage, and finally keep the pressure for 5 minutes, and the pressure drop ≤ 0.75 bar is qualified.

6. The airtight test method according to claim 5, characterized in that, During the gas test in step S3, when abnormal pressure is detected, the following operations are automatically performed: Cut off the oil circuit through the ball valve assembly (5) within 0.5 seconds; Start the silencing device composed of a reducing joint (3), a silencer (4) and a three-way cock (11); Trigger the acoustic and optical alarm signal.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it realizes the automatic control of the airtight test method described in claims 5-6, including: Real-time acquisition and processing of pressure data; Automatic sequential control of the test process; Automatic judgment and handling of abnormal situations; Automatic generation of test reports.

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