Engine air leakage detection device

Abstract

The utility model relates to the technical field of engine detection, and discloses an engine air leakage detection device comprising a support frame; the nitrogen supply part is arranged on the support frame and is connected with any one of a plurality of cylinders of the tested engine; the first gas detection part is used for detecting the gas leakage amount of a cylinder gasket between the detected cylinder and the adjacent cylinder; the second gas detection component is used for detecting the gas leakage amount of the exhaust valve; the third gas detection component is used for detecting the gas leakage amount of the intake valve; the fourth gas detection part is connected with an oil filler cap of the detected engine and is used for detecting the gas leakage rate of the piston ring; and the fifth gas detection part is connected with the cooling liquid degassing pipe and is used for detecting the gas leakage amount of the detected air cylinder leaking gas to the cooling liquid channel of the detected engine through the air cylinder gasket. The detection device can perform leakage test on a plurality of parts at the same time, and the integration level is high.

Description

Technical Field

[0001] The utility model relates to the technical field of engine detection, in particular to an engine air leakage detection device. Background Art

[0002] For newly assembled engines, engines that have completed verification tests or engines that have been used by users, if the sealing of the cylinder gasket, intake and exhaust valves and piston rings can be tested, problems such as cylinder gasket blowby, abnormal wear or size deviation of valves or valve seats, piston ring matching, abnormal wear or size deviation of piston rings or cylinder liner inner walls can be effectively discovered. Therefore, a device is needed that can accurately measure the gas leakage in the above parts when the engine is not running.

[0003] At present, the sealing test method for the engine is mainly the leakage test of a single component. The leakage test of each component requires a set of separate test tools. There are many test tools and the cost is high. Therefore, there is an urgent need for a device that can perform leakage tests on multiple components in the installed state. Utility Model Content

[0004] In view of this, the utility model provides an engine air leakage detection device to solve the problem of requiring too many test tools in the leakage test of a single component.

[0005] The utility model provides an engine gas leakage detection device, comprising: a support frame; a nitrogen gas supply component, which is arranged on the support frame, the nitrogen gas supply component is suitable for providing nitrogen and is connected to any one of a plurality of cylinders of the engine to be tested, and the cylinder connected to the nitrogen gas supply component forms the tested cylinder; a first gas detection component, which is arranged on the support frame and is suitable for being connected to a cylinder adjacent to the tested cylinder, and the first gas detection component is used to detect the gas leakage of the cylinder gasket between the tested cylinder and its adjacent cylinder; a second gas detection component, which is arranged on the support frame and is suitable for being connected to the exhaust port corresponding to the tested cylinder, and the second gas detection component is used to detect the gas leakage of the tested cylinder gasket; a third gas detection component, which is arranged on the support frame and is suitable for being connected to the air inlet corresponding to the tested cylinder, and the third gas detection component is used to detect the gas leakage of the intake valve of the tested engine; a fourth gas detection component, which is arranged on the support frame and is suitable for being connected to the fuel filler cap of the tested engine, and the fourth gas detection component is used to detect the gas leakage of the piston ring of the tested engine; a fifth gas detection component, which is arranged on the support frame and is suitable for being connected to the coolant degassing pipe of the tested engine, and the fifth gas detection component is used to detect the gas leakage of the tested cylinder through the cylinder gasket to the coolant channel of the tested engine.

[0006] Beneficial effects: When a leakage test is performed on the engine under test, when a certain pressure of nitrogen is filled into the cylinder under test through the nitrogen gas supply component, if the first gas detection component detects the gas flow or sees bubbles, the gas leakage at the cylinder gasket between the cylinder under test and its adjacent cylinder is confirmed, thereby judging the sealing performance of the cylinder gasket; if the second gas detection component detects the gas flow or sees bubbles, the gas leakage at the exhaust valve is confirmed, thereby judging the sealing performance of the exhaust valve; if the third gas detection component detects the gas flow or sees bubbles, the gas leakage at the intake valve is confirmed, thereby judging the sealing performance of the intake valve; if the fourth gas detection component detects the gas flow or sees bubbles, the gas leakage at the piston ring is confirmed, thereby judging the sealing performance of the piston ring; if the fifth gas detection component detects the gas flow or sees bubbles, the gas leakage from the cylinder under test to the coolant channel of the engine under test through the cylinder gasket is confirmed, thereby judging the sealing performance of the cylinder gasket between the cylinder under test and the coolant channel of the engine under test. By using the above-mentioned engine air leakage detection device, multiple parts can be leak tested at the same time, the integration is high, and the sealing performance of the engine can be evaluated.

[0007] In an optional embodiment, the engine leakage detection device also includes an air inlet plugging tool, which is fixed at several air inlets of the engine under test, and the air inlet plugging tool has several connecting holes, which are connected to the third gas detection component.

[0008] Beneficial effect: No intake manifold is installed at the air inlet of the engine, several air inlets are blocked by the air inlet blocking tool, and then the third gas detection component is connected through the air inlet blocking tool. The air inlet blocking tool is used to facilitate the connection between the gas detection component and the engine, and disassembly and assembly are easier.

[0009] In an optional embodiment, the air inlet blocking tool is an air inlet blocking plate, and the two opposite sides of the air inlet blocking plate are a blocking side and a connecting side, respectively. The connecting side has a plurality of connectors connected to the third gas detection component, and the blocking side is provided with a plurality of sealing rings or sealing gaskets having the same shape as the plurality of air inlets of the engine under test.

[0010] Beneficial effects: The air inlet plugging tool is formed by the plate, which has a simple structure, is easy to implement, and has low cost. The gas detection component can be easily connected through the connector. The sealing ring or gasket can ensure the sealing between the tool and the engine, avoiding the situation where the leakage between the tool and the engine causes inaccurate detection. The original intake manifold sealing ring or gasket of the engine can be used.

[0011] In an optional embodiment, the engine leakage detection device also includes an exhaust port plugging tool, which is fixed at several exhaust ports of the engine under test, and the exhaust port plugging tool has several connecting ports, which are connected to the second gas detection component.

[0012] Beneficial effect: No exhaust manifold is installed at the exhaust port of the engine, several exhaust ports are blocked by exhaust port blocking tooling, and then the second gas detection component is connected through the exhaust port blocking tooling. The exhaust port blocking tooling is used to facilitate connection between the gas detection component and the engine, and disassembly and assembly are easier.

[0013] In an optional embodiment, the exhaust port sealing tool is an exhaust port sealing plate, and the two opposite sides of the exhaust port sealing plate are a sealing side and a connecting side, respectively. The connecting side has a plurality of connectors connected to the second gas detection component, and the sealing side is provided with a plurality of sealing rings or sealing gaskets having the same shape as the plurality of exhaust ports of the engine under test.

[0014] Beneficial effects: The exhaust port plugging plate is formed by the plate, which has a simple structure, is easy to implement, and has low cost. The gas detection component can be easily connected through the connector. The sealing ring or gasket can ensure the sealing between the tooling and the engine, avoiding the situation where the leakage between the tooling and the engine causes inaccurate detection. The original exhaust manifold sealing ring or gasket of the engine can be used.

[0015] In an optional embodiment, the engine leakage detection device also includes a first connecting fixture and a second connecting fixture, one end of the first connecting fixture is connected to the cylinder to be tested, the other end of the first connecting fixture is connected to the nitrogen supply component, one end of the second connecting fixture is connected to the cylinder adjacent to the cylinder to be tested, and the other end of the second connecting fixture is connected to the first gas detection component.

[0016] Beneficial effect: The cylinder and the gas detection component are connected by using the first connecting fixture and the second connecting fixture, and the connection is simple. In an optional embodiment, the first connecting fixture and the second connecting fixture are both connecting pipes, the top of the connecting pipe is a threaded section, and the bottom of the connecting pipe is connected to the spark plug mounting hole of the cylinder through threads and a sealing ring, or is press-fitted to the injector mounting hole of the cylinder through a sealing ring.

[0017] Beneficial effects: The connecting pipe has a simple structure, is easy to disassemble and assemble, and improves the efficiency of disassembly and assembly.

[0018] In an optional embodiment, the first gas detection component, the second gas detection component, the third gas detection component, the fourth gas detection component, and the fifth gas detection component all include an observation water bottle, a gas flow meter, and a detection pipeline. The observation water bottle is arranged on a support frame, and the gas flow meter is arranged on the detection pipeline. One end of the detection pipeline is connected to the observation water bottle and the other end is suitable for being connected to the engine under test.

[0019] Beneficial effects: The setting of the observation water bottle makes it convenient for the inspectors to observe whether the leaked gas generates bubbles in the water or the rate at which the bubbles are formed, and the gas leakage can be measured in real time through the gas flow meter to ensure the accuracy of the detected gas leakage, thereby ensuring the accuracy of the measurement results. The leakage amount of each part of the tested cylinder under static conditions can be qualitatively and quantitatively measured, thereby qualitatively and quantitatively evaluating the cylinder sealing of the engine.

[0020] In an optional embodiment, the nitrogen supply component includes a nitrogen bottle, a pressure regulating valve, an inflation pressure gauge and a gas supply pipeline. The nitrogen bottle is arranged on a support frame, one end of the gas supply pipeline is connected to the nitrogen bottle and the other end is connected to the cylinder to be tested, and the pressure regulating valve and the inflation pressure gauge are both arranged on the gas supply pipeline.

[0021] Beneficial effects: The nitrogen cylinder is used to store high-pressure nitrogen. The pressure regulating valve can ensure that the nitrogen pressure is stable at the specified value, providing a stable gas source for leak detection. Different nitrogen pressures can be adjusted according to the engine model and state for leak testing. The inflation pressure gauge is used to collect inflation pressure. When a certain pressure of nitrogen is filled from the first connection tool, the air tightness of the cylinder under test can be tested.

[0022] In an optional embodiment, the engine air leakage detection device further includes a locking fixture, which is suitable for locking a flywheel or a transmission shaft of the engine under test.

[0023] Beneficial effect: The locking tool can be used to lock the flywheel and the drive shaft to ensure that the crankshaft and piston will not move when the engine is filled with nitrogen. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 This is a schematic structural diagram of an engine air leakage detection device according to an embodiment of the utility model;

[0026] Figure 2 for Figure 1 A three-dimensional view of the air inlet plugging tool shown;

[0027] Figure 3 for Figure 2 A three-dimensional view of the air inlet blocking tool shown in another perspective;

[0028] Figure 4 for Figure 1A cross-sectional view of the first connecting fixture and the second connecting fixture shown;

[0029] Figure 5 It is a cross-sectional view of another first connecting tool and a second connecting tool of an embodiment of the utility model.

[0030] Description of reference numerals:

[0031] 1. Support frame;

[0032] 2. Nitrogen gas supply components; 201. Nitrogen gas cylinder; 202. Pressure regulating valve; 203. Gas charging pressure gauge; 204. Gas supply pipeline; 205. Nitrogen gas cylinder pressure gauge;

[0033] 3. First gas detection component; 301. First observation water bottle; 302. First gas flow meter; 303. First detection pipeline;

[0034] 4. Second gas detection component; 401. Second observation water bottle; 402. Second gas flow meter; 403. Second detection pipeline;

[0035] 5. Third gas detection component; 501. Third observation water bottle; 502. Third gas flow meter; 503. Third detection pipeline;

[0036] 6. Fourth gas detection component; 601. Fourth observation water bottle; 602. Fourth gas flow meter; 603. Fourth detection pipeline;

[0037] 7. Fifth gas detection component; 701. Fifth observation water bottle; 702. Fifth gas flow meter; 703. Fifth detection pipeline;

[0038] 8. Air inlet plugging tool; 801. Connector;

[0039] 9. The first connecting tool;

[0040] 10. Second connecting tooling;

[0041] 11. Lock the tooling;

[0042] 12. Engine; 1201. Cylinder; 1202. Fuel filler cap; 1203. Coolant degassing pipe. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0044] Combine the following Figures 1 to 5 , describing an embodiment of the utility model.

[0045] According to an embodiment of the utility model, an engine gas leakage detection device is provided, comprising: a support frame 1, a nitrogen gas supply component 2, a first gas detection component 3, a second gas detection component 4, a third gas detection component 5, a fourth gas detection component 6 and a fifth gas detection component 7. The nitrogen gas supply component 2 is arranged on the support frame 1, and the nitrogen gas supply component 2 is suitable for providing nitrogen and connected to any one of the several cylinders 1201 of the engine 12 under test, and the cylinder 1201 connected to the nitrogen gas supply component 2 forms the cylinder under test; the first gas detection component 3 is arranged on the support frame 1 and is suitable for connecting to the cylinder adjacent to the cylinder 1201 under test, and the first gas detection component 3 is used to detect the gas leakage of the cylinder gasket between the cylinder under test and its adjacent cylinder; the second gas detection component 4 is arranged on the support frame 1 and is suitable for connecting to the exhaust port corresponding to the cylinder 1201 under test, and the second gas detection component 4 is used to detect the gas leakage of the exhaust valve of the engine 12 under test; The three gas detection components 5 are arranged on the support frame 1 and are suitable for being connected to the air intake port corresponding to the tested cylinder 1201. The third gas detection component 5 is used to detect the gas leakage of the intake valve of the tested engine 12; the fourth gas detection component 6 is arranged on the support frame 1 and is suitable for being connected to the fuel filler cap 1202 of the tested engine 12. The fourth gas detection component 6 is used to detect the gas leakage of the piston ring of the tested engine 12; the fifth gas detection component 7 is arranged on the support frame 1 and is suitable for being connected to the coolant degassing pipe 1203 of the tested engine 12. The fifth gas detection component 7 is used to detect the gas leakage of the tested cylinder through the cylinder gasket to the coolant channel of the tested engine 12.

[0046] When the engine gas leakage detection device of this embodiment is used to perform a gas leakage test on the tested engine 12, when nitrogen gas of a certain pressure is filled into the tested cylinder 1201 through the nitrogen gas supply component 2, if the first gas detection component 3 detects the gas flow or bubbles are seen, the gas leakage at the cylinder gasket between the tested cylinder 1201 and its adjacent cylinder 1201 is confirmed, thereby judging the sealing performance of the cylinder gasket; if the second gas detection component 4 detects the gas flow or bubbles are seen, the gas leakage at the exhaust valve is confirmed, thereby judging the sealing performance of the exhaust valve; If the third gas detection component 5 detects gas flow or sees bubbles, the gas leakage at the intake valve is confirmed, thereby judging the sealing of the intake valve; if the fourth gas detection component 6 detects gas flow or sees bubbles, the gas leakage at the piston ring is confirmed, thereby judging the sealing of the piston ring; if the fifth gas detection component 7 detects gas flow or sees bubbles, the gas leakage from the tested cylinder to the coolant channel of the tested engine 12 through the cylinder gasket is confirmed, thereby judging the sealing between the tested cylinder and the coolant channel of the tested engine 12. The above-mentioned engine gas leakage detection device can be used to perform leakage tests on multiple parts at the same time, with high integration, and can evaluate the sealing of the engine 12.

[0047] It should be noted that the engine 12 under test is not equipped with a camshaft to ensure that the intake and exhaust valves remain fully closed. All water interfaces and crankcase ventilation interfaces except the coolant degassing pipe 1203 must be sealed with plugs. The coolant degassing pipe 1203 is used to discharge the gas leaked from the cylinder under test through the cylinder gasket to the coolant channel of the engine 12 under test.

[0048] In one embodiment, the engine gas leakage detection device further includes an air inlet plugging tool 8, which is fixed at several air inlets of the engine 12 to be tested, and has several connecting holes, which are connected to the third gas detection component 5. No intake manifold is installed at the air inlet of the engine 12, and several air inlets are blocked by the air inlet plugging tool 8, and then the third gas detection component 5 is connected by the air inlet plugging tool 8. The air inlet plugging tool 8 is used to facilitate the connection of the gas detection component and the engine 12, and the disassembly and assembly are simpler.

[0049] Furthermore, the air inlet plugging tool 8 is an air inlet plugging plate, and the two opposite sides of the air inlet plugging plate are a plugging side and a connecting side, respectively. The connecting side has a plurality of connectors 801 connected to the third gas detection component 5, and the plugging side is provided with a plurality of sealing rings or sealing gaskets that are consistent with the shapes of the plurality of air inlets of the engine under test. The air inlet plugging tool 8 is formed by a plate material, which has a simple structure, is easy to implement, and has a low cost. The gas detection component can be conveniently connected by the connector 801. The sealing ring or sealing gasket can ensure the sealing between the tool and the engine 12, and avoid the situation where the leakage between the tool and the engine 12 causes inaccurate detection. The original intake manifold sealing ring or sealing gasket of the engine can be used.

[0050] In one embodiment, the engine gas leakage detection device further includes an exhaust port plugging tool, which is fixed at several exhaust ports of the engine 12 to be tested, and has several connecting ports, which are connected to the second gas detection component 4. No exhaust manifold is installed at the exhaust port of the engine 12, and several exhaust ports are blocked by the exhaust port plugging tool, and then the second gas detection component 4 is connected by the exhaust port plugging tool. The exhaust port plugging tool facilitates the connection of the gas detection component and the engine 12, and the disassembly and assembly are simpler.

[0051] Furthermore, the exhaust port plugging tool is an exhaust port plugging plate, and the two opposite sides of the exhaust port plugging plate are a plugging side and a connecting side, respectively. The connecting side has a plurality of connectors 801 connected to the second gas detection component 4, and the plugging side is provided with a plurality of sealing rings or sealing gaskets that are consistent with the shapes of the plurality of air inlets of the engine under test. The exhaust port plugging plate is formed by a plate material, which has a simple structure, is easy to implement, and has a low cost. The gas detection component can be conveniently connected through the connector 801. The sealing ring or sealing gasket can ensure the sealing between the tooling and the engine 12, and avoid the situation where the leakage between the tooling and the engine 12 causes inaccurate detection. The original exhaust manifold sealing ring or sealing gasket of the engine can be used.

[0052] Specifically, the air inlet blocking plate is installed through the intake manifold bolt mounting hole, and the exhaust port blocking plate is installed through the exhaust manifold bolt mounting hole, which is easy to install and disassemble.

[0053] It is understandable that the air inlet blocking fixture 8 and the exhaust port blocking fixture may not be provided, and the detection component may be directly connected to the air inlet and the exhaust port.

[0054] In one embodiment, the engine leakage detection device also includes a first connecting tool 9 and a second connecting tool 10, one end of the first connecting tool 9 is connected to the cylinder to be tested, the other end of the first connecting tool 9 is connected to the nitrogen supply component 2, one end of the second connecting tool 10 is connected to the cylinder 1201 adjacent to the cylinder to be tested, and the other end of the second connecting tool 10 is connected to the first gas detection component 3. When the tested engine 12 is a spark ignition engine, one end of the first connecting fixture 9 is connected to the spark plug mounting hole of the tested cylinder, and one end of the second connecting fixture 10 is connected to the spark plug mounting hole of the cylinder 1201 adjacent to the tested cylinder. When the tested engine 12 is a compression ignition engine, one end of the first connecting fixture 9 is connected to the injector mounting hole of the tested cylinder, and one end of the second connecting fixture 10 is connected to the injector mounting hole of the cylinder 1201 adjacent to the tested cylinder. After one of the cylinders 1201 is tested, the first connecting fixture 9 and the second connecting fixture 10 are connected to the other cylinders 1201, and a leakage test can be performed on all cylinders 1201 of the engine 12. The cylinder and the gas detection component are connected using the first connecting fixture 9 and the second connecting fixture 10, and the connection is simple.

[0055] Specifically, the first connecting fixture 9 and the second connecting fixture 10 are both connecting pipes, the top of the connecting pipe is a threaded section, and the bottom of the connecting pipe is connected to the spark plug mounting hole through threads and a sealing ring, or is pressed into the injector mounting hole of the cylinder through a sealing ring. The connecting pipe has a simple structure, is easy to disassemble and assemble, and improves disassembly and assembly efficiency.

[0056] It should be noted that Figure 4 and Figure 5 The difference between the connecting pipes is Figure 5 The bottom of the connecting pipe in the engine has no threads and is pressed into the injector mounting hole just like the original injector of the engine. Figure 4 The connecting pipe in the spark plug is used to connect the spark plug mounting hole. Figure 5 The connecting pipe is used to connect the injector mounting hole.

[0057] In one embodiment, the first gas detection component 3, the second gas detection component 4, the third gas detection component 5, the fourth gas detection component 6, and the fifth gas detection component 7 all include an observation water bottle, a gas flow meter, and a detection pipeline. The observation water bottle is arranged on the support frame 1, and the gas flow meter is arranged on the detection pipeline. One end of the detection pipeline is connected to the observation water bottle and the other end is suitable for connecting to the engine 12 under test. The setting of the observation water bottle facilitates the detection personnel to observe whether the leaked gas generates bubbles in the water or the rate of bubble formation, and the gas flow meter can measure the leakage in real time to ensure the accuracy of the detected gas leakage, thereby ensuring the accuracy of the measurement result, and can qualitatively and quantitatively measure the leakage of each part of the tested cylinder under static conditions, so as to qualitatively and quantitatively evaluate the cylinder sealing of the engine.

[0058] Furthermore, in order to distinguish the observation water bottles, gas flow meters and detection pipelines of each detection component, the first gas detection component 3 includes a first observation water bottle 301, a first gas flow meter 302 and a first detection pipeline 303, the second gas detection component 4 includes a second observation water bottle 401, a second gas flow meter 402 and a second detection pipeline 403, the third gas detection component 5 includes a third observation water bottle 501, a third gas flow meter 502 and a third detection pipeline 503, the fourth gas detection component 6 includes a fourth observation water bottle 601, a fourth gas flow meter 602 and a fourth detection pipeline 603, and the fifth gas detection component 7 includes a fifth observation water bottle 701, a fifth gas flow meter 702 and a fifth detection pipeline 703.

[0059] Specifically, one end of the first detection pipeline 303 is connected to the first observation water bottle 301 and the other end is connected to the cylinder 1201 adjacent to the cylinder to be detected. The second connection fixture 10 is installed on the cylinder 1201 adjacent to the cylinder to be detected. The second connection fixture 10 is connected to the first gas flow meter 302 and the first observation water bottle 301 through the first detection pipeline 303. The gas leakage of the cylinder gasket between the two cylinders can be confirmed by observing the first observation water bottle 301 and the first gas flow meter 302.

[0060] Specifically, one end of the second detection pipeline 403 is connected to the second observation water bottle 401 and the other end is connected to the exhaust port corresponding to the tested cylinder. The second detection pipeline 403 is used to connect the second gas flow meter 402 and the second observation water bottle 401 on the connector 801 of the exhaust port plugging tool corresponding to the tested cylinder, and the gas leakage of the exhaust valve can be confirmed by observing the second observation water bottle 401 and the second gas flow meter 402.

[0061] Specifically, one end of the third detection pipeline 503 is connected to the third observation water bottle 501 and the other end is connected to the air inlet corresponding to the cylinder to be tested. The third detection pipeline 503 is used to connect the third gas flow meter 502 and the third observation water bottle 501 on the connector 801 of the air inlet plugging tool 8 corresponding to the cylinder to be tested. The gas leakage of the intake valve can be confirmed by observing the third observation water bottle 501 and the third gas flow meter 502.

[0062] Specifically, one end of the fourth detection pipeline 603 is connected to the fourth observation water bottle 601 and the other end is connected to the fuel filler cap 1202. The fuel filler cap 1202 is connected to the fourth gas flow meter 602 and the fourth observation water bottle 601 through the fourth detection pipeline 603. The gas leakage of the piston ring can be confirmed by observing the fourth observation water bottle 601 and the fourth gas flow meter 602. The fuel filler cap 1202 is a component of the engine 12 itself. A hole is punched on the fuel filler cap 1202, and the second detection pipeline 403 is connected to the punched hole.

[0063] Specifically, one end of the fifth detection pipeline 703 is connected to the fifth observation water bottle 701 and the other end is connected to the coolant degassing pipe 1203. The coolant degassing pipe 1203 is connected to the fifth gas flow meter 702 and the fifth observation water bottle 701 through the fifth detection pipeline 703. By observing the fifth observation water bottle 701 and the fifth gas flow meter 702, the gas leakage amount of the tested cylinder leaking to the coolant channel of the engine 12 through the cylinder gasket can be confirmed.

[0064] Preferably, five observation water bottles are arranged side by side on the support frame 1, and the rate at which the gas leaking from the intake and exhaust valves, cylinder gasket and piston ring of the cylinder under test forms bubbles in water can be observed simultaneously through the five observation water bottles, so as to qualitatively evaluate the sealing performance of the cylinder under test. In addition, the flow rate of the gas leaking from the intake and exhaust valves, cylinder gasket and piston ring of the cylinder under test can be measured in real time through five gas flow meters, so as to quantitatively evaluate the sealing performance of the cylinder under test.

[0065] In the related art, a separate gas leakage detection device for the cylinder gasket of the engine uses an external water pump to fill the engine water channel and the detection device with water and discharge the residual gas, selects one cylinder and introduces nitrogen at a certain pressure, and uses the flow rate of water squeezed out by the gas leaking from the cylinder gasket to the engine water channel to convert the flow rate of gas leaking from the cylinder gasket to the engine water channel of the cylinder. When using this detection method, when the cylinder gasket leakage is small, a small-range and high-precision water flow meter is required to detect the actual leakage, which is costly and difficult to measure; when the cylinder gasket leakage is large, bubbles may pass through the water flow meter, resulting in a low measurement result.

[0066] In the present embodiment, the leakage of nitrogen is detected by a gas flow meter. It only needs to be filled with nitrogen but not water. The equipment is easy to operate and can be carried out in the engine disassembly and assembly room or on a test bench. Moreover, compared with the existing method of detecting the flow rate of water squeezed out by gas leaking from the cylinder gasket to the engine water channel through a water flow meter, the gas flow meter directly detects the leakage of nitrogen with higher detection accuracy.

[0067] In one embodiment, the nitrogen supply component 2 includes a nitrogen bottle 201, a pressure regulating valve 202, an inflation pressure gauge 203 and an air supply pipeline 204. The nitrogen bottle 201 is arranged on the support frame 1, one end of the air supply pipeline 204 is connected to the nitrogen bottle 201 and the other end is connected to the cylinder to be tested, and the pressure regulating valve 202 and the inflation pressure gauge 203 are both arranged on the air supply pipeline 204. The nitrogen bottle 201 is used to store high-pressure nitrogen, and the pressure regulating valve 202 can ensure that the pressure of the nitrogen is stable at a specified value, providing a stable gas source for leak detection, and can adjust different nitrogen pressures according to the model and state of the engine 12 for leak testing. The inflation pressure gauge 203 is used to collect the inflation pressure. When a certain pressure of nitrogen is filled from the first connecting tool 9, the air tightness of the cylinder to be tested can be tested.

[0068] Furthermore, the engine leakage detection device also includes a controller and a data acquisition device. The controller is electrically connected to the gas flow meter and the inflation pressure gauge 203. The controller is used to obtain data from the gas flow meter and the inflation pressure gauge 203, and record the leakage amount based on the obtained information. All gas flow meters can be recorded in real time on the data acquisition device.

[0069] Furthermore, the nitrogen supply component 2 further includes a nitrogen cylinder pressure gauge 205, which is arranged on the gas supply pipeline 204 and between the nitrogen cylinder 201 and the pressure regulating valve 202, and the charging pressure gauge 203 is arranged downstream of the pressure regulating valve 202. The nitrogen cylinder pressure gauge 205 monitors the pressure of the outlet of the nitrogen cylinder 201 at any time.

[0070] In one embodiment, the engine air leakage detection device also includes a locking fixture 11, and the locking fixture 11 is suitable for locking the flywheel or drive shaft of the engine 12 under test. The locking fixture 11 can be used to lock the flywheel or the drive shaft to ensure that the crankshaft and piston of the engine 12 do not move when nitrogen is filled. If the engine 12 is on the test bench, the locking fixture 11 is preferably used to lock the drive shaft. The locking fixture 11 is different according to the different parts to be locked. Since the engine 12 is different, the flywheel model is different. According to the specific situation, a suitable locking fixture 11 is selected, for example, the locking fixture 11 uses a card plate, etc. The specific structure of the locking fixture 11 is not described here.

[0071] In one embodiment, the support frame 1 is a mobile trolley, which can realize rapid movement of the engine air leakage detection device and has good maneuverability.

[0072] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. An engine air leakage detection device, characterized in that: include: Support frame (1); A nitrogen supply component (2) is arranged on the support frame (1), the nitrogen supply component (2) is suitable for providing nitrogen and is connected to any one of a plurality of cylinders of the engine (12) to be tested, and the cylinder connected to the nitrogen supply component (2) forms the cylinder to be tested; A first gas detection component (3) is arranged on the support frame (1) and is suitable for being connected to a cylinder adjacent to the cylinder being tested, wherein the first gas detection component (3) is used to detect the gas leakage of the cylinder gasket between the cylinder being tested and its adjacent cylinder; a second gas detection component (4), arranged on the support frame (1) and adapted to be connected to an exhaust port corresponding to the cylinder under test, the second gas detection component (4) being used to detect the gas leakage of the exhaust valve of the engine under test (12); a third gas detection component (5), arranged on the support frame (1) and adapted to be connected to an air intake port corresponding to the tested cylinder, the third gas detection component (5) being used to detect the gas leakage of the air intake valve of the tested engine (12); a fourth gas detection component (6), arranged on the support frame (1) and adapted to be connected to the fuel filler cap (1202) of the engine (12) under test, the fourth gas detection component (6) being used to detect the gas leakage of the piston ring of the engine (12) under test; A fifth gas detection component (7) is arranged on the support frame (1) and is suitable for being connected to a coolant degassing pipe of the engine (12) under test, wherein the fifth gas detection component (7) is used to detect the amount of gas leakage from the cylinder under test to the coolant channel of the engine (12) under test via the cylinder gasket.

2. The engine air leakage detection device according to claim 1, characterized in that: The engine gas leakage detection device further comprises an air inlet plugging tool (8), wherein the air inlet plugging tool (8) is fixed at a plurality of air inlets of the engine (12) under test, and the air inlet plugging tool (8) has a plurality of connection holes, wherein the connection holes are connected to the third gas detection component (5).

3. The engine air leakage detection device according to claim 2, characterized in that: The air inlet blocking tool (8) is an air inlet blocking plate, and the two opposite sides of the air inlet blocking plate are a blocking side and a connecting side, respectively. The connecting side has a plurality of connectors (801) connected to the third gas detection component (5), and the blocking side is provided with a plurality of sealing rings or sealing gaskets that are consistent with the shapes of the plurality of air inlets of the engine under test.

4. The engine gas leakage detection device according to any one of claims 1 to 3, characterized in that: The engine gas leakage detection device also includes an exhaust port plugging tool, the exhaust port plugging tool is fixed at a plurality of exhaust ports of the engine (12) under test, the exhaust port plugging tool has a plurality of connection ports, and the connection ports are connected to the second gas detection component (4).

5. The engine gas leakage detection device according to claim 4, characterized in that: The exhaust port sealing tool is an exhaust port sealing plate, and the two opposite sides of the exhaust port sealing plate are a sealing side and a connecting side, respectively. The connecting side has a plurality of connectors (801) connected to the second gas detection component (4), and the sealing side is provided with a plurality of sealing rings or sealing gaskets that are consistent with the shapes of the plurality of exhaust ports of the engine under test.

6. The engine gas leakage detection device according to any one of claims 1 to 3, characterized in that: The engine gas leakage detection device further comprises a first connecting fixture (9) and a second connecting fixture (10), wherein one end of the first connecting fixture (9) is connected to the cylinder to be detected, and the other end of the first connecting fixture (9) is connected to the nitrogen gas supply component (2), one end of the second connecting fixture (10) is connected to a cylinder adjacent to the cylinder to be detected, and the other end of the second connecting fixture (10) is connected to the first gas detection component (3).

7. The engine gas leakage detection device according to claim 6, characterized in that: The first connecting tool (9) and the second connecting tool (10) are both connecting pipes, the top of the connecting pipe is a threaded section, and the bottom of the connecting pipe is connected to the spark plug mounting hole of the cylinder through a thread and a sealing ring, or is pressed into the injector mounting hole of the cylinder through a sealing ring.

8. The engine gas leakage detection device according to any one of claims 1 to 3, characterized in that: The first gas detection component (3), the second gas detection component (4), the third gas detection component (5), the fourth gas detection component (6), and the fifth gas detection component (7) all include an observation water bottle, a gas flow meter, and a detection pipeline. The observation water bottle is arranged on the support frame (1), and the gas flow meter is arranged on the detection pipeline. One end of the detection pipeline is connected to the observation water bottle and the other end is suitable for being connected to the engine (12) under test.

9. The engine gas leakage detection device according to any one of claims 1 to 3, characterized in that: The nitrogen supply component (2) comprises a nitrogen bottle (201), a pressure regulating valve (202), a gas charging pressure gauge (203) and a gas supply pipeline (204); the nitrogen bottle (201) is arranged on the support frame (1); one end of the gas supply pipeline (204) is connected to the nitrogen bottle (201) and the other end is connected to the tested cylinder; the pressure regulating valve (202) and the gas charging pressure gauge (203) are both arranged on the gas supply pipeline (204).

10. The engine gas leakage detection device according to any one of claims 1 to 3, characterized in that: The engine air leakage detection device further comprises a locking tool (11), wherein the locking tool (11) is suitable for locking a flywheel or a transmission shaft of the engine (12) under test.

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