Engine cylinder leakage test method

Abstract

The invention relates to the technical field of engine production, and particularly discloses an engine cylinder block leakage test method comprising the following steps: S1, plugging inlets and outlets of an oil duct, a cavity and a water channel; s2, inflating the water channels, and respectively testing mutual leakage of the cavity to the water channels and mutual leakage of the oil channels to the water channels; s3, exhausting the water channel, inflating the oil channel, and testing the mutual leakage of the oil channel by the testing cavity in only one way; s4, inflating the cavity and the water channel, and respectively testing cavity outleakage, oil channel outleakage and water channel outleakage; s5, removing the plug; s6, data recorded in the testing process are sorted and analyzed, and whether the air tightness of the cylinder body is qualified or not is judged; the device solves the problems of misjudgment and the like of an oil duct, a cavity and a water channel in respective leakage and mutual leakage tests.

Description

Technical Field

[0001] This invention relates to the field of engine manufacturing technology, and more specifically, to a method for leak testing of engine cylinder blocks. Background Technology

[0002] During the machining process of engine block, air tightness and leak testing are required for the high-pressure oil passages, cavities, and water passages of the block. According to the design leak testing standards of the block, the differential pressure test method is used to conduct external leakage tests and mutual leakage tests on the oil passages, cavities, and water passages respectively. The purpose of the test is to promptly identify problems with the blank and machining quality of each chamber of the block, ensure the machining quality of the block, and reduce engine production costs. Therefore, accurate air tightness testing process methods are particularly important.

[0003] The existing leak testing process used in the machining of engine cylinder blocks has multiple directions of gas leakage in the cavity during leak testing, which can easily lead to misjudgments in the external leakage and mutual leakage tests of oil passages, cavities and water passages. Summary of the Invention

[0004] The purpose of this invention is to provide a method for testing engine cylinder leaks, which solves the problems of misjudgment during external and mutual leakage tests of oil passages, cavities, and water passages.

[0005] This invention is achieved through the following technical solution: a method for testing engine cylinder leaks, comprising the following steps:

[0006] S1. Seal the inlet and outlet of oil passages, cavities, and water passages;

[0007] S2. Water channel inflation, and test mutual leakage between cavity and water channel and oil channel and water channel respectively, for a total of two tests;

[0008] S3, Waterway venting, oilway filling, test cavity to oilway mutual leakage, only one test;

[0009] S4. Inflate the cavity and water channel, and test for external leakage of the cavity, oil channel, and water channel respectively, for a total of three tests;

[0010] S5. Remove the blockage.

[0011] Furthermore, in step S1, a pressure tester or visual inspection method is used to check the sealed oil passages, cavities, and water passages to ensure that there is no gas leakage.

[0012] Furthermore, step S2 specifically includes the following steps:

[0013] S21. Open the inflation device and inflate the waterway with gas. At the same time, observe the pressure gauge to ensure that the inflation pressure reaches the test standard.

[0014] S22. Turn off the inflation device, switch the test port to the cavity, and use a pressure tester to detect the pressure change in the cavity to determine if there is a leak.

[0015] S23. Switch the test port to the oil passage, detect the pressure change in the oil passage, and determine whether there is a leak.

[0016] Furthermore, step S3 specifically includes the following steps:

[0017] S31. Expel the gas from the waterway;

[0018] S32. Connect the air charging device to the oil passage inlet of the cylinder block and charge the oil passage with gas at a predetermined pressure.

[0019] S33. Switch the test port to the cavity and use a pressure tester to detect the pressure change inside the cavity to determine if there is a leak.

[0020] Furthermore, step S4 specifically includes the following steps:

[0021] S41. Connect the inflation device to the cavity and water channel respectively, and inflate them with gas at a predetermined pressure.

[0022] S42. Switch the test port to the cavity and use a pressure tester to detect the pressure difference between the cavity and the external environment to determine if there is a leak.

[0023] S43. Switch the test port to the oil passage to detect the pressure difference between the oil passage and the external environment;

[0024] S44. Switch the test port to the waterway itself to detect the pressure difference between the waterway and the external environment.

[0025] Furthermore, it also includes the following steps:

[0026] S6. Organize and analyze the data recorded during the test to determine whether the airtightness of the cylinder is up to standard.

[0027] Furthermore, before step S1, the sealing surface of the cylinder needs to be cleaned with a cleaning agent and a clean cloth to ensure that the sealing surface is clean and flat.

[0028] The technical solution of the present invention has at least the following advantages and beneficial effects:

[0029] Each test maintained the single direction of gas leakage. While keeping the leak testing process short and accurate, it accurately tested the external and internal leaks of each chamber, preventing misjudgments during testing, ensuring the quality of cylinder block machining, and reducing engine production costs. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 A schematic diagram illustrating the measurement types in step S2 of an engine block leak testing method provided by the present invention;

[0032] Figure 2 A schematic diagram illustrating the measurement types in step S3 of an engine block leak testing method provided by the present invention;

[0033] Figure 3 A schematic diagram illustrating the measurement types in step S4 of an engine block leak testing method provided by the present invention; Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0036] Reference Figures 1 to 3 As shown, this embodiment provides a method for testing engine cylinder leaks, including the following steps: First, according to the design drawings of the cylinder block, prepare suitable sealing tools, such as sealing plugs, sealing plates, etc., to ensure that the sealing tools match the inlet and outlet dimensions of the cylinder block. The sealing tools need to have valves that communicate with the corresponding sealing cavity to facilitate venting and internal pressure testing.

[0037] After preparing the sealing tools, first use a cleaning agent and a clean cloth to clean the sealing surface of the cylinder to remove oil, dust and other impurities, and ensure that the sealing surface is clean and flat.

[0038] S1. Seal the inlets and outlets of the oil passages, cavities, and water passages to ensure consistent initial pressure. Install the sealing tool at the inlets and outlets of the oil passages, cavities, and water passages on the cylinder block, and tighten it in place using appropriate tools (such as wrenches, screwdrivers, etc.) to ensure a tight seal. In step S1, use a pressure tester or visual inspection to check the sealed oil passages, cavities, and water passages to ensure there is no gas leakage, providing a good basis for subsequent testing.

[0039] S2. Water channel inflation: Connect the inflation device to the water channel inlet of the cylinder block, ensuring a tight connection. Test for leakage between the cavity and the water channel, and between the oil channel and the water channel; a total of two tests are performed.

[0040] like Figure 1 As shown, step S2 specifically includes the following steps:

[0041] S21. Open the inflation device and inflate the water channel with gas. At the same time, observe the pressure gauge to ensure that the inflation pressure reaches the test standard. The pressure in the water channel after the gas is inflated is greater than the pressure inside the cavity and oil channel. If there is leakage from the cavity to the water channel or from the oil channel to the water channel, the gas in the water channel can only enter the cavity or oil channel in one direction.

[0042] S22. Then turn off the inflation device, switch the test port to the cavity, and use a pressure tester to detect the pressure change in the cavity to determine whether there is mutual leakage between the water channel and the cavity. If the pressure inside the cavity increases, it indicates that there is mutual leakage between the cavity and the water channel. If the pressure inside the cavity does not change, there is no mutual leakage between the two.

[0043] S23. Then switch the test port to the oil passage and detect the pressure change in the oil passage to determine whether there is mutual leakage between the water passage and the oil passage. If the pressure inside the oil passage increases, it means that there is mutual leakage between the oil passage and the water passage. If the pressure inside the oil passage does not change, there is no mutual leakage between the two.

[0044] S3. Then, the water channel is vented, the oil channel is filled with air, and the cavity is tested for mutual leakage with the oil channel. Only one test is performed.

[0045] like Figure 2 As shown, step S3 specifically includes the following steps:

[0046] S31. Open the waterway vent valve, i.e., the air valve, to release the gas in the waterway;

[0047] S32. Connect the air filling device to the oil passage inlet of the cylinder block and fill the oil passage with gas at a predetermined pressure; similarly, once the oil passage is full of gas, it is only necessary to check whether the high-pressure gas has entered the passage cavity.

[0048] S33. Switch the test port to the cavity and use a pressure tester to detect the pressure change inside the cavity to determine whether there is mutual leakage between the cavity and the oil passage. If the pressure inside the cavity increases, it indicates that there is mutual leakage between the cavity and the oil passage. If the pressure inside the cavity does not change, there is no mutual leakage between the two.

[0049] S4. Inflate the cavity and water channel, and test for external leakage of the cavity, oil channel, and water channel respectively, for a total of three tests;

[0050] like Figure 3 As shown, step S4 specifically includes the following steps:

[0051] S41. Connect the inflation device to the cavity and water channel respectively, and fill them with gas at a predetermined pressure so that the oil channel, cavity and water channel are filled with gas at the same pressure as the oil, usually greater than atmospheric pressure. If there is a leak, the gas in the oil channel, cavity and water channel can only leak outward.

[0052] S42. Switch the test port to the cavity and use a pressure tester to detect the pressure difference between the cavity and the external environment to determine whether there is any leakage from the cavity. If the pressure inside the cavity decreases, it indicates that there is a leak between the cavity and the outside. If the pressure inside the cavity does not change, it indicates that there is no leakage from the cavity.

[0053] S43. Switch the test port to the oil passage and detect the pressure difference between the oil passage and the external environment to determine whether there is an external leak in the oil passage. If the internal pressure of the oil passage decreases, it indicates that there is a leak between the oil passage and the outside. If the internal pressure of the oil passage does not change, it indicates that there is no external leak in the oil passage.

[0054] S44. Switch the test port to the waterway itself to detect the pressure difference between the waterway and the external environment to determine whether there is any leakage from the waterway. If the pressure inside the waterway decreases, it indicates that there is a leak between the waterway and the outside. If the pressure inside the waterway does not change, it indicates that there is no leakage from the waterway.

[0055] S5. Remove the seals. In practice, turn off the inflation device and disconnect it from the cylinder body. Remove the seals in sequence, ensuring nothing is missed.

[0056] It also includes the following steps:

[0057] S6. Organize and analyze the data recorded during the test to determine whether the airtightness of the cylinder is qualified. If there is mutual leakage or external leakage in the oil passage, cavity and water passage, the cylinder is deemed unqualified. In specific implementation, the pressure data comparison algorithm is used to process and analyze the pressure data during the test to determine whether there is leakage in each channel.

[0058] Presenting test results to operators in the form of charts or reports facilitates subsequent quality control and improvement.

[0059] In summary, by improving and adjusting the leak testing process during engine block machining, this leak testing process ensures that the gas leakage direction remains singular for each test. While maintaining a short and accurate test cycle, it accurately tests the external and internal leaks of each chamber, preventing misjudgments during testing, ensuring the quality of engine block machining, and reducing engine production costs.

[0060] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for testing the leak of an engine cylinder, characterized in that: The following steps are involved: S1. Block the inlet and outlet of oil channel, cavity and water channel; S2, water channel inflation, test the mutual leakage between cavity and water channel and between oil channel and water channel, two tests in total; S3, exhaust the water channel, inflate the oil channel, test the mutual leakage between the cavity and the oil channel, only one test; S4, inflate the cavity and water channel to test cavity leakage, oil channel leakage and water channel leakage respectively, a total of three tests; S5. Remove the blockage.

2. The engine cylinder leak testing method according to claim 1, characterized in that: In step S1, a pressure tester or a visual inspection method is used to check the blocked oil passages, cavities and water passages to ensure that there is no gas leakage.

3. The engine cylinder leak testing method according to claim 2, characterized in that: In step S2, the following steps are specifically included: S21. Open the inflation device and fill the waterway with gas while observing the pressure gauge to ensure that the inflation pressure reaches the test standard; S22, close the inflation device, switch the test port to the cavity, use the pressure tester to detect the pressure change in the cavity, and determine whether there is a leak; S23, switch the test port to the oil channel, detect the pressure change in the oil channel, and determine whether there is a leak.

4. The engine cylinder leak testing method according to claim 3, characterized in that: In step S3, the following steps are specifically included: S31, discharge the gas in the waterway; S32, connecting the charging device to the oil channel inlet of the cylinder body, and charging the oil channel with gas at a predetermined pressure; S33, switch the test port to the cavity, use the pressure tester to detect the pressure change in the cavity, and determine whether there is a leak.

5. The engine cylinder leak testing method according to claim 4, characterized in that: In step S4, the following steps are specifically included: S41, connecting the inflation device to the mold cavity and the water channel respectively, and filling the two with gas of a predetermined pressure; S42. Switch the test port to the cavity and use a pressure tester to detect the pressure difference between the cavity and the external environment to determine whether there is a leak. S43, switching the test port to the oil channel to detect the pressure difference between the oil channel and the external environment; S44, switch the test port to the water channel itself to detect the pressure difference between the water channel and the external environment.

6. The engine cylinder leak testing method according to claim 5, characterized in that: The following steps are also included: S6. Arrange and analyze the data recorded during the test to determine whether the air tightness of the cylinder body is qualified.

7. The engine cylinder leak testing method according to claim 6, characterized in that: Before step S1, it is also necessary to use a detergent and a clean cloth to clean the sealing surface of the cylinder body to ensure that the sealing surface is clean and flat.

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