CN117686146A - Engine leakage detection device and engine leakage detection method - Google Patents

Abstract

The invention relates to the technical field of automobiles, and particularly discloses an engine leakage detection device and an engine leakage detection method. Because the gas can pass through finer gaps relative to the liquid, the leakage detection by using the gas has greater precision relative to the leakage detection by using the liquid, and the detection cost is lower.

Description

Engine leakage detection device and engine leakage detection method

Technical Field

The invention relates to the technical field of automobiles, in particular to an engine leakage detection device and an engine leakage detection method.

Background

Engine housings, which generally include cylinder blocks, cylinder heads, front and rear covers, oil pans, etc., are generally manufactured by die casting, and often have small cracks, which are difficult to find by naked eyes, caused by various reasons during the manufacturing process. This often requires some detection means to accomplish this. Some leakage detecting devices of the shell are used for injecting liquid into the shell, and checking whether the liquid seeps out after pressurization, so that water marks are difficult to observe at some very fine cracks, errors are easy to cause in the aspect of observation, and no cracks are found.

In order to solve the above problems, there is a need for an engine leak detection device to solve the above problems, in which it is difficult to observe occurrence of water marks by a method of injecting liquid for some very fine cracks, thereby causing an increase in leak detection error.

Disclosure of Invention

The invention aims at: the engine leakage detecting device and the engine leakage detecting method are provided to solve the problem that in the related art, for some very fine cracks, water marks are difficult to observe through a liquid injection method, so that leakage detecting errors are increased.

In one aspect, the present invention provides an engine leak detection apparatus comprising:

a frame body;

the fuel oil channel leakage detection assembly is arranged on the frame body and comprises a first cock and a pressure detection piece, wherein the air inlet end of the pressure detection piece is communicated with a high-pressure air source, the air outlet end of the pressure detection piece is communicated with the liquid inlet end of a fuel oil channel to be detected on the engine, and the first cock is used for plugging the liquid outlet end of the fuel oil channel to be detected;

the water channel leakage detection assembly is arranged on the frame body and comprises a first air-collecting tank, a first air-intercepting valve, a first flow detection part and a second cock, wherein the first air-intercepting valve, the first air-collecting tank and the first flow detection part are sequentially connected in series, an air inlet of the first air-intercepting valve is used for being communicated with the high-pressure air source, an air outlet of the first flow detection part is used for being communicated with a liquid inlet end of a water channel to be detected on the engine, and the second cock is used for plugging a liquid outlet end of the water channel to be detected;

the engine oil channel leakage detection assembly is arranged on the frame body and comprises a second air collecting tank, a second air intercepting valve, a second flow detection piece and a third cock, wherein the second air intercepting valve, the second air collecting tank and the second flow detection piece are sequentially connected in series, an air inlet of the second air intercepting valve is used for being communicated with a high-pressure air source, an air outlet of the second flow detection piece is used for being communicated with a liquid inlet end of an engine oil channel to be detected on the engine, and the third cock is used for plugging a liquid outlet end of the engine oil channel to be detected.

As an optimal technical scheme of the engine leakage detection device, the fuel channel leakage detection assembly further comprises a first self-detection switch, wherein the first self-detection switch is arranged on a pipeline between the air outlet end of the pressure detection piece and the liquid inlet end of the fuel channel to be detected;

the water channel leakage detection assembly further comprises a second self-detection switch, and the second self-detection switch is arranged on a pipeline between the air outlet of the first flow detection piece and the liquid inlet end of the water channel to be detected;

the engine oil channel leakage detection assembly further comprises a third self-detection switch, and the third self-detection switch is arranged on a pipeline between the air outlet of the second flow detection piece and the air inlet end of the engine oil channel to be detected.

As the preferable technical scheme of the engine leak detection device, the engine leak detection device further comprises a controller and a display, wherein the controller is respectively in communication connection with the pressure detection piece, the first flow detection piece, the second flow detection piece, the first self-detection switch, the second self-detection switch, the third self-detection switch and the display.

The engine leakage detection device is characterized by further comprising a main battery, wherein the main battery is used for supplying power to the fuel channel leakage detection assembly, the water channel leakage detection assembly, the engine oil channel leakage detection assembly, the controller and the display.

As the preferred technical scheme of engine leak hunting device, still include a plurality of universal wheels, a plurality of the universal wheel interval set up in the bottom of support body.

In another aspect, the present invention provides an engine leak detection method, which is executed by the engine leak detection apparatus in any one of the above aspects, including:

s10: detecting leakage rates of the fuel rail leakage detection assembly, the water channel leakage detection assembly and the engine oil rail leakage detection assembly, and then executing S20;

s20: if the fuel channel leak detection assembly, the water channel leak detection assembly and the engine oil channel leak detection assembly are all smaller than the required leak rate, executing S30, otherwise executing S40, S40: overhauling the fuel channel leakage detection assembly, the water channel leakage detection assembly and the engine oil channel leakage detection assembly, wherein the leakage rate in the fuel channel leakage detection assembly, the water channel leakage detection assembly and the engine oil channel leakage detection assembly does not reach the standard, and then executing S10;

s30: the pressure detection piece detects the pressure difference of the fuel channel to be detected, and further calculates the leakage rate of the fuel channel to be detected; the first flow detection part detects the flow difference of the water channel to be detected, and further calculates the leakage rate of the water channel to be detected; and the second flow detection piece detects the flow difference of the oil passage to be detected, and further calculates the leakage rate of the oil passage to be detected.

As a preferable technical scheme of the engine leakage detection method, a first self-detection switch is arranged on a pipeline between an air outlet end of the pressure detection piece and a liquid inlet end of the fuel oil duct to be detected on the engine; the second self-checking switch is arranged on a pipeline between the air outlet of the first flow detection piece and the liquid inlet end of the water channel to be detected on the engine; the third self-checking switch is arranged on a pipeline between an air outlet of the second flow detection piece and a liquid inlet end of the oil duct of the machine to be detected on the engine;

s10 specifically comprises the following steps:

s11: closing the first self-checking switch, the second self-checking switch and the third self-checking switch;

s12: starting a high-pressure air source, and transmitting detection signals of the pressure detection piece, the first flow detection piece and the second flow detection piece to a controller;

s13: the controller calculates leakage rates of the fuel channel leakage detection assembly, the water channel leakage detection assembly and the engine oil channel leakage detection assembly.

As a preferred technical solution of the engine leak detection method, S20 specifically includes: the leakage rate of the fuel oil channel leakage detection assembly is smaller than 2.5ccm/min, and the fuel oil channel leakage detection assembly is qualified; the leakage rate of the water channel leakage detection assembly is smaller than 5ccm/min, and the water channel leakage detection assembly is qualified; the leakage rate of the engine oil channel leakage detection assembly is less than 75ccm/min, and the engine oil channel leakage detection assembly is qualified.

As a preferred technical scheme of the engine leak detection method, S30 specifically includes:

the high-pressure gas source is used for introducing high-pressure gas with preset pressure a into the fuel oil duct to be detected, and after preset time t, the pressure detection piece is used for detecting the pressure difference of the fuel oil duct to be detected, so that the leakage rate of the fuel oil duct to be detected is calculated;

the high-pressure air source is used for introducing high-pressure air with preset pressure b into the first air collection tank, closing an air inlet of the first air collection tank, opening a second self-checking switch to enable the pressure of the first air collection tank to be consistent with the pressure of the water channel to be detected, detecting the flow difference of the water channel to be detected by the first flow detection part after a preset time t, and further calculating the leakage rate of the water channel to be detected;

and the high-pressure air source is used for introducing high-pressure air with preset pressure of c into the second air collection tank, closing an air inlet of the second air collection tank, opening a third self-checking switch to enable the pressure of the second air collection tank to be consistent with the pressure of the oil duct of the machine to be tested, detecting the flow difference of the oil duct to be tested by the second flow detecting piece after the preset time t, and further calculating the leakage rate of the oil duct of the machine to be tested.

As a preferable technical scheme of the engine leak detection method, after S30 is executed, S50 is executed; s50 specifically includes:

initial pressure in the fuel oil duct to be measured: a is more than or equal to 0.40 and less than or equal to 0.75bar, and the leakage rate of the fuel oil channel to be detected is less than 5ccm/min, so that the fuel oil channel to be detected is qualified;

initial pressure in the water channel to be measured: b is more than or equal to 0.40bar and less than or equal to 0.60bar, and the leakage rate of the water channel to be detected is less than 10ccm/min, so that the water channel to be detected is qualified;

the initial pressure of the oil duct of the machine to be tested is as follows: c is more than or equal to 0.20bar and less than or equal to 0.40bar, and the leakage rate of the engine oil channel to be detected is less than 170ccm/min, so that the engine oil channel to be detected is qualified.

The beneficial effects of the invention are as follows:

the invention provides an engine leakage detection device and an engine leakage detection method, wherein the engine leakage detection device comprises a frame body, a fuel channel leakage detection assembly, a water channel leakage detection assembly and an engine oil channel leakage detection assembly, wherein the fuel channel leakage detection assembly is arranged on the frame body and comprises a first cock and a pressure detection piece, the air inlet end of the pressure detection piece is communicated with a high-pressure air source, the air outlet end of the pressure detection piece is communicated with the liquid inlet end of a fuel channel to be detected on an engine, and the first cock is used for plugging the liquid outlet end of the fuel channel to be detected; the water channel leakage detection assembly is arranged on the frame body and comprises a first gas collection tank, a first gas interception valve, a first flow detection piece and a second cock, wherein the first gas interception valve, the first gas collection tank and the first flow detection piece are sequentially connected in series, a gas inlet of the first gas interception valve is communicated with a high-pressure gas source, a gas outlet of the first flow detection piece is communicated with a liquid inlet end of a water channel to be detected on the engine, and the second cock is used for plugging a liquid outlet end of the water channel to be detected; the engine oil duct leakage detecting assembly is arranged on the frame body and comprises a second air collecting tank, a second air intercepting valve, a second flow detecting piece and a third cock, wherein the second air intercepting valve, the second air collecting tank and the second flow detecting piece are sequentially connected in series, an air inlet of the second air intercepting valve is communicated with a high-pressure air source, an air outlet of the second flow detecting piece is communicated with a liquid inlet end of an engine oil duct to be detected, and the third cock is used for plugging a liquid outlet end of the engine oil duct to be detected. When the leakage detection is carried out on the fuel oil duct to be detected of the engine, the high-pressure air source ventilates to one end of the fuel oil duct to be detected, and as the other end of the fuel oil duct to be detected is sealed, the air pressure in the fuel oil duct to be detected reaches a preset value, and then the preset time is waited, so that the change value of the pressure detection piece, namely the pressure difference, can be measured, and the leakage rate of the fuel oil duct to be detected can be calculated according to the pressure difference. When the water channel to be detected of the engine is subjected to leakage detection, a high-pressure air source fills high-pressure air into the first air collection tank, then the air inlet of the first air collection tank is closed, the air outlet of the first air collection tank is opened, the air in the first air collection tank flows into the water channel to be detected until the pressure of the first air collection tank is the same as that of the water channel to be detected, at the moment, a preset time is waited, if the water channel to be detected has leakage, the first flow detection part can detect the amount of air flow flowing from the first air collection tank to the water channel to be detected, and then the leakage rate of the water channel to be detected can be calculated according to the index; when leak detection is carried out on an oil duct to be detected of an engine, a high-pressure air source is used for filling high-pressure air into a second air collection tank, then an air inlet of the second air collection tank is closed, an air outlet of the second air collection tank is opened, air in the second air collection tank flows into the oil duct to be detected until the pressure of the second air collection tank is the same as that of the oil duct to be detected, preset time is waited at the moment, if leakage exists in the water duct to be detected, a second flow detection piece can be used for detecting the amount of air flow flowing from the second air collection tank to the oil duct to be detected, and then the leakage rate of the oil duct to be detected can be calculated according to the index. Because the gas can pass through finer gaps relative to the liquid, the leakage detection by using the gas has greater precision relative to the leakage detection by using the liquid, and the detection cost is lower.

Drawings

FIG. 1 is a schematic diagram of an engine leak detection apparatus in an embodiment of the invention;

FIG. 2 is a schematic diagram of an engine leak detection apparatus in accordance with an embodiment of the invention;

FIG. 3 is a flow chart of a method of leak detection of an engine in an embodiment of the invention.

In the figure:

100. a high pressure air source;

1. a frame body;

2. the fuel oil duct leakage detection assembly; 21. a pressure detecting member; 22. a first self-checking switch;

3. a waterway leak detection assembly; 31. a first gas collection tank; 32. a first air cutoff valve; 33. a first flow rate detecting member; 34. a second self-checking switch;

4. the engine oil duct leakage detection assembly; 41. a second gas collection tank; 42. a second air cutoff valve; 43. a second flow rate detecting member; 44. a third self-checking switch;

5. a controller; 6. a display; 7. a main battery; 8. a universal wheel; 9. a standby battery; 10. and (5) mounting the shell.

Detailed Description

The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first location" and "second location" are two distinct locations and wherein the first feature is "above," "over" and "over" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is level above the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.

As shown in fig. 1 and 2, the present embodiment provides an engine leakage detection device, which includes a frame 1, a fuel channel leakage detection assembly 2, a water channel leakage detection assembly 3 and an engine oil channel leakage detection assembly 4, wherein the fuel channel leakage detection assembly 2 is disposed on the frame 1, and includes a first cock and a pressure detection member 21, an air inlet end of the pressure detection member 21 is used for communicating with a high pressure air source 100, an air outlet end of the pressure detection member 21 is used for communicating with an air inlet end of a fuel channel to be detected on an engine, and the first cock is used for plugging an air outlet end of the fuel channel to be detected; the water channel leakage detection assembly 3 is arranged on the frame body 1 and comprises a first gas collection tank 31, a first gas interception valve 32, a first flow detection piece 33 and a second cock, wherein the first gas interception valve 32, the first gas collection tank 31 and the first flow detection piece 33 are sequentially connected in series, a gas inlet of the first gas interception valve 32 is communicated with the high-pressure gas source 100, a gas outlet of the first flow detection piece 33 is communicated with a liquid inlet end of a water channel to be detected on an engine, and the second cock is used for plugging a liquid outlet end of the water channel to be detected; the engine oil duct leakage detecting assembly 4 is arranged on the frame body 1 and comprises a second air collecting tank 41, a second air intercepting valve 42, a second flow detecting piece 43 and a third cock, wherein the second air intercepting valve 42, the second air collecting tank 41 and the second flow detecting piece 43 are sequentially connected in series, an air inlet of the second air intercepting valve 42 is communicated with the high-pressure air source 100, an air outlet of the second flow detecting piece 43 is communicated with a liquid inlet end of an engine oil duct to be detected on the engine, and the third cock is used for plugging a liquid outlet end of the engine oil duct to be detected. When the leak detection is performed on the fuel passage to be detected of the engine, the high-pressure gas source 100 ventilates to one end of the fuel passage to be detected, and since the other end of the fuel passage to be detected is closed, the gas pressure in the fuel passage to be detected reaches a preset value, and then the preset time is waited, so that the change value, namely the pressure difference, of the pressure detection piece 21 can be measured, and the leak rate of the fuel passage to be detected can be calculated according to the pressure difference. When the leak detection is performed on the water channel to be detected of the engine, the high-pressure air source 100 fills high-pressure air into the first air collection tank 31, then closes the air inlet of the first air collection tank 31, opens the air outlet of the first air collection tank 31, and enables the air in the first air collection tank 31 to flow into the water channel to be detected until the pressure of the first air collection tank 31 is the same as the pressure of the water channel to be detected, waiting for a preset time at the moment, and if the water channel to be detected has leakage, enabling the first flow detection piece 33 to detect the amount of the air flow flowing from the first air collection tank 31 to the water channel to be detected, and further calculating the leakage rate of the water channel to be detected according to the index; when the oil duct to be detected of the engine is subjected to leak detection, the high-pressure air source 100 fills high-pressure air into the second air collection tank 41, then closes the air inlet of the second air collection tank 41, opens the air outlet of the second air collection tank 41, and the air in the second air collection tank 41 flows into the oil duct to be detected until the pressure of the second air collection tank 41 is the same as that of the oil duct to be detected, at the moment, waiting for a preset time, and if the oil duct to be detected has leakage, detecting the amount of the air flow flowing from the second air collection tank 41 to the oil duct to be detected by the second flow detecting piece 43, so that the leakage rate of the oil duct to be detected can be calculated according to the index. Because the gas can pass through finer gaps relative to the liquid, the leakage detection by using the gas has greater precision relative to the leakage detection by using the liquid, and the detection cost is lower. Specifically, the high pressure gas source 100 is a stable gas source.

Specifically, the waterway detection assembly and the engine oil gallery detection assembly are each integrated into one mounting shell 10.

Optionally, the fuel channel leakage detecting assembly 2 further includes a first self-detecting switch 22, where the first self-detecting switch 22 is disposed on a pipeline between the air outlet end of the pressure detecting member 21 and the liquid inlet end of the fuel channel to be detected; the water channel leakage detecting assembly 3 further comprises a second self-detecting switch 34, and the second self-detecting switch 34 is arranged on a pipeline between the air outlet of the first flow detecting piece 33 and the liquid inlet end of the water channel to be detected; the engine oil channel leakage detection assembly 4 further comprises a third self-detection switch 44, and the third self-detection switch 44 is arranged on a pipeline between the air outlet of the second flow detection piece 43 and the liquid inlet end of the engine oil channel to be detected. In this embodiment, in order to ensure the accuracy of the leak detection of the device, the first self-checking switch 22, the second self-checking switch 34 and the third self-checking switch 44 are further disposed at the air outlets of the fuel channel leak detection assembly 2, the water channel leak detection assembly 3 and the engine oil channel leak detection assembly respectively, and before the leak detection, the first self-checking switch 22, the second self-checking switch 34 and the third self-checking switch 44 are respectively turned off, so that the leak condition of the pipeline where each of them is located is detected to reach the standard by the pressure detection member 21, the first flow detection member 33 and the second flow detection member 43.

Optionally, the engine leak detection device further includes a controller 5 and a display 6, where the controller 5 is communicatively connected to the pressure detecting member 21, the first flow detecting member 33, the second flow detecting member 43, the first self-detecting switch 22, the second self-detecting switch 34, the third self-detecting switch 44, and the display 6, respectively. In this embodiment, the controller 5 is configured to control the operation state of the electronic devices on the engine leak detection apparatus, and collect information detected by the pressure detecting member 21, the first flow detecting member 33, and the second flow detecting member 43, and aggregate, calculate, and analyze the information, to obtain leak rates with respect to the fuel passage, the water passage, and the engine oil passage. The display 6 is used for displaying data collected by the controller 5 and calculated data.

Optionally, the engine leak detection device further comprises a main battery 7, wherein the main battery 7 is used for supplying power to the fuel channel leak detection assembly 2, the water channel leak detection assembly 3, the engine oil channel leak detection assembly 4, the controller 5 and the display 6. In this embodiment, the main battery 7 supplies power to the electric equipment, and the arrangement can make the engine leakage detection device not need to be bound at a position close to an external power supply, so that the device can be arranged at any position needing leakage detection. In other embodiments, a backup battery 9 is further included, and when the power of the main battery 7 is exhausted, the backup battery 9 may be used instead of the main battery 7.

Optionally, the engine leakage detection device further includes a plurality of universal wheels 8, and the plurality of universal wheels 8 are arranged at intervals at the bottom of the frame body 1. In this embodiment, the plurality of universal wheels 8 can facilitate movement of the apparatus, specifically, the universal wheels 8 include rollers and a bracket, the bracket is disposed on the frame body 1, and the rollers and the bracket have a first state of relative rotation and a second state of relative fixation.

As shown in fig. 3, the present embodiment further provides an engine leak detection method, which is executed by the engine leak detection device in the above scheme, including:

s10: detecting leakage rates of the fuel passage leakage detecting assembly 2, the water passage leakage detecting assembly 3 and the engine oil passage leakage detecting assembly 4, and then performing S20;

s10 specifically comprises the following steps: s11: the first, second and third self-test switches 22, 34 and 44 are turned off. S12: the high-pressure air source 100 is activated to transmit detection signals of the pressure detecting member 21, the first flow detecting member 33, and the second flow detecting member 43 to the controller 5. S13: the controller 5 calculates leak rates of the fuel passage leak detection assembly 2, the water passage leak detection assembly 3, and the engine oil passage leak detection assembly 4.

In S12, the high-pressure air source 100 introduces high-pressure air into the fuel channel leak detection assembly 2, and after a preset time, the pressure detection member 21 detects the pressure difference in the pipeline of the fuel channel leak detection assembly 2, so as to calculate the leak rate of the fuel channel leak detection assembly 2.

The high-pressure air source 100 is used for introducing high-pressure air into the first air collection tank 31, closing the air inlet of the first air collection tank 31, enabling the pressure of the first air collection tank 31 to be consistent with the pressure of a pipeline connected with a water channel to be detected, detecting the flow difference between the first air collection tank 31 and the second self-detection switch 34 by the first flow detection piece 33 after the preset time, and further calculating the leakage rate of the water channel leakage detection assembly 3.

The high-pressure air source 100 is used for introducing high-pressure air into the second air collection tank 41, closing the air inlet of the second air collection tank 41, enabling the pressure of the second air collection tank 41 to be consistent with the pressure of a pipeline connected with an oil duct of the machine to be detected, and after a preset time, the second flow detection piece 43 is used for detecting the flow difference between the second air collection tank 41 and the third self-detection switch 44, so that the leakage rate of the oil duct leakage detection assembly 4 is calculated.

S20: if the leak detection assembly 2, the water channel leak detection assembly 3 and the engine oil channel leak detection assembly 4 are all smaller than the required leak rate, S30 is executed, and if not, S40 is executed: overhauling the fuel channel leakage detecting assembly 2, the water channel leakage detecting assembly 3 and the engine oil channel leakage detecting assembly 4, wherein the leakage rate does not reach the standard, and then executing S10;

in this step, when any one of the fuel path leak detection assembly 2, the water path leak detection assembly 3 and the engine oil path leak detection assembly 4 is failed in the self-detection leak rate, it is necessary to repair the same, and the self-detection is performed again after the repair.

S20 specifically comprises: the leakage rate of the fuel oil duct leakage detection assembly 2 is smaller than 2.5ccm/min, and is qualified; the leak rate of the water channel leak detection assembly 3 is smaller than 5ccm/min, and the water channel leak detection assembly is qualified; the leakage rate of the engine oil duct leakage detection assembly 4 is less than 75ccm/min, and the engine oil duct leakage detection assembly is qualified.

S30: the pressure detecting piece 21 detects the pressure difference of the fuel passage to be detected, and further calculates the leakage rate of the fuel passage to be detected; the first flow detecting element 33 detects the flow difference of the water channel to be detected, and further calculates the leakage rate of the water channel to be detected; the second flow rate detecting member 43 detects the flow rate difference of the oil passage to be measured, and further calculates the leak rate of the oil passage of the computer to be measured.

S30 specifically comprises: the high-pressure gas source 100 is used for introducing high-pressure gas with preset pressure a into the fuel oil duct to be detected, and after the preset time t passes, the pressure detection piece 21 is used for detecting the pressure difference of the fuel oil duct to be detected, so that the leakage rate of the fuel oil duct to be detected is calculated; the high-pressure air source 100 is used for introducing high-pressure air with preset pressure b into the first air collection tank 31, closing an air inlet of the first air collection tank 31, opening the second self-checking switch 34 to enable the pressure of the first air collection tank 31 to be consistent with the pressure of a water channel to be detected, detecting the flow difference of the water channel to be detected by the first flow detecting piece 33 after the preset time t, and further calculating the leakage rate of the water channel to be detected; the high-pressure air source 100 is used for introducing high-pressure air with preset pressure c into the second air collection tank 41, closing the air inlet of the second air collection tank 41, opening the third self-checking switch 44 to enable the pressure of the second air collection tank 41 to be consistent with the pressure of an oil duct to be tested, detecting the flow difference of the oil duct to be tested by the second flow detecting piece 43 after the preset time t, and further calculating the leakage rate of the oil duct to be tested.

Optionally, after S30 is performed, S50 is performed; s50 specifically includes: initial pressure in the fuel passage to be measured: a is more than or equal to 0.40 and less than or equal to 0.75bar, and the leakage rate of the fuel oil channel to be detected is less than 5ccm/min, and the fuel oil channel is qualified; the time t is in the range of 10min-40min.

Initial pressure in the water channel to be measured: b is more than or equal to 0.40bar and less than or equal to 0.60bar, and the leakage rate of the water channel to be detected is less than 10ccm/min, and the water channel to be detected is qualified. The time t is in the range of 10min-40min.

The initial pressure of the oil duct of the machine to be tested is as follows: c is more than or equal to 0.20bar and less than or equal to 0.40bar, and the leakage rate of the engine oil channel to be detected is less than 170ccm/min, so that the engine oil channel to be detected is qualified. The time t is in the range of 10min-40min.

It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.

Claims (10)

1. Engine leak hunting device, its characterized in that includes:

a frame body (1);

the fuel oil duct leakage detection assembly (2) is arranged on the frame body (1) and comprises a first cock and a pressure detection piece (21), wherein the air inlet end of the pressure detection piece (21) is used for being communicated with a high-pressure air source (100), the air outlet end of the pressure detection piece (21) is used for being communicated with the liquid inlet end of a fuel oil duct to be detected on the engine, and the first cock is used for plugging the liquid outlet end of the fuel oil duct to be detected;

the water channel leakage detection assembly (3) is arranged on the frame body (1) and comprises a first gas collection tank (31), a first gas interception valve (32), a first flow detection piece (33) and a second cock, wherein the first gas interception valve (32), the first gas collection tank (31) and the first flow detection piece (33) are sequentially connected in series, a gas inlet of the first gas interception valve (32) is used for being communicated with the high-pressure gas source (100), a gas outlet of the first flow detection piece (33) is used for being communicated with a liquid inlet end of a water channel to be detected on the engine, and the second cock is used for plugging a liquid outlet end of the water channel to be detected;

the engine oil duct leakage detecting assembly (4) is arranged on the frame body (1), and comprises a second gas collecting tank (41), a second gas intercepting valve (42), a second flow detecting piece (43) and a third cock, wherein the second gas intercepting valve (42), the second gas collecting tank (41) and the second flow detecting piece (43) are sequentially connected in series, a gas inlet of the second gas intercepting valve (42) is used for being communicated with a high-pressure gas source (100), a gas outlet of the second flow detecting piece (43) is used for being communicated with a liquid inlet end of an engine oil duct to be detected on the engine, and the third cock is used for plugging a liquid outlet end of the engine oil duct to be detected.

2. The engine leakage detection device according to claim 1, wherein the fuel passage leakage detection assembly (2) further comprises a first self-detection switch (22), and the first self-detection switch (22) is arranged on a pipeline between an air outlet end of the pressure detection piece (21) and a liquid inlet end of the fuel passage to be detected;

the water channel leakage detection assembly (3) further comprises a second self-detection switch (34), and the second self-detection switch (34) is arranged on a pipeline between the air outlet of the first flow detection piece (33) and the liquid inlet end of the water channel to be detected;

the engine oil channel leakage detection assembly (4) further comprises a third self-detection switch (44), and the third self-detection switch (44) is arranged on a pipeline between the air outlet of the second flow detection piece (43) and the liquid inlet end of the engine oil channel to be detected.

3. The engine leak detection apparatus as defined in claim 2, further comprising a controller (5) and a display (6), wherein the controller (5) is in communication with the pressure sensing element (21), the first flow sensing element (33), the second flow sensing element (43), the first self-check switch (22), the second self-check switch (34), the third self-check switch (44), and the display (6), respectively.

4. The engine leak detection apparatus as defined in claim 3, further comprising a main battery (7), the main battery (7) being configured to power the fuel rail leak detection assembly (2), the water rail leak detection assembly (3), the engine oil rail leak detection assembly (4), the controller (5) and the display (6).

5. The engine leak detection apparatus as defined in claim 1, further comprising a plurality of universal wheels (8), wherein a plurality of the universal wheels (8) are disposed at intervals at the bottom of the frame body (1).

6. An engine leak detection method performed by an engine leak detection apparatus according to any one of claims 1 to 5, comprising:

s10: detecting leakage rates of the fuel rail leakage detecting component (2), the water channel leakage detecting component (3) and the engine oil rail leakage detecting component (4), and then executing S20;

s20: if the fuel channel leak detection assembly (2), the water channel leak detection assembly (3) and the engine oil channel leak detection assembly (4) are all smaller than the required leak rate, executing S30, otherwise executing S40, S40: overhauling the fuel oil channel leakage detection assembly (2), the water channel leakage detection assembly (3) and the engine oil channel leakage detection assembly (4) in which the leakage rate does not reach the standard, and then executing S10;

s30: the pressure detection piece (21) detects the pressure difference of the fuel channel to be detected, and further calculates the leakage rate of the fuel channel to be detected; the first flow detection piece (33) detects the flow difference of the water channel to be detected, and further calculates the leakage rate of the water channel to be detected; the second flow detection piece (43) detects the flow difference of the oil passage to be detected, and further calculates the leakage rate of the oil passage to be detected.

7. The engine leak detection method according to claim 6, characterized in that a first self-detection switch (22) is provided on a pipe between an outlet end of the pressure detection member (21) and a liquid inlet end of the fuel passage to be detected on the engine; the second self-checking switch (34) is arranged on a pipeline between the air outlet of the first flow detection piece (33) and the liquid inlet end of the water channel to be detected on the engine; the third self-checking switch (44) is arranged on a pipeline between the air outlet of the second flow detection piece (43) and the liquid inlet end of the oil duct of the engine to be detected;

s10 specifically comprises the following steps:

s11: closing the first self-test switch (22), the second self-test switch (34) and the third self-test switch (44);

s12: starting a high-pressure air source (100), and transmitting detection signals of the pressure detection piece (21), the first flow detection piece (33) and the second flow detection piece (43) to a controller (5);

s13: the controller (5) calculates leakage rates of the fuel channel leakage detection assembly (2), the water channel leakage detection assembly (3) and the engine oil channel leakage detection assembly (4).

8. The engine leak detection method as defined in claim 7, wherein S20 specifically includes: the leakage rate of the fuel oil channel leakage detection assembly (2) is smaller than 2.5ccm/min, and the fuel oil channel leakage detection assembly is qualified; the leakage rate of the water channel leakage detection assembly (3) is smaller than 5ccm/min, and the water channel leakage detection assembly is qualified; the leakage rate of the engine oil channel leakage detection assembly (4) is smaller than 75ccm/min, and the engine oil channel leakage detection assembly is qualified.

9. The engine leak detection method as defined in claim 6, wherein S30 specifically includes:

the high-pressure gas source (100) is used for introducing high-pressure gas with preset pressure a into the fuel oil duct to be detected, and after preset time t, the pressure detection piece (21) is used for detecting the pressure difference of the fuel oil duct to be detected, so that the leakage rate of the fuel oil duct to be detected is calculated;

the high-pressure air source (100) is used for introducing high-pressure air with preset pressure b into the first air collection tank (31), closing an air inlet of the first air collection tank (31), opening a second self-checking switch (34) to enable the pressure of the first air collection tank (31) to be consistent with the pressure of the water channel to be detected, detecting the flow difference of the water channel to be detected by the first flow detection piece (33) after preset time t, and further calculating the leakage rate of the water channel to be detected;

the high-pressure air source (100) is used for introducing high-pressure air with preset pressure of c into the second air collection tank (41), closing an air inlet of the second air collection tank (41), opening a third self-checking switch (44) to enable the pressure of the second air collection tank (41) to be consistent with the pressure of the oil duct of the machine to be detected, detecting the flow difference of the oil duct to be detected by the second flow detecting piece (43) after preset time t, and further calculating the leakage rate of the oil duct of the machine to be detected.

10. The engine leak detection method as defined in claim 6, wherein S50 is performed after S30 is performed; s50 specifically includes:

initial pressure in the fuel oil duct to be measured: a is more than or equal to 0.40 and less than or equal to 0.75bar, and the leakage rate of the fuel oil channel to be detected is less than 5ccm/min, so that the fuel oil channel to be detected is qualified;

initial pressure in the water channel to be measured: b is more than or equal to 0.40bar and less than or equal to 0.60bar, and the leakage rate of the water channel to be detected is less than 10ccm/min, so that the water channel to be detected is qualified;

the initial pressure of the oil duct of the machine to be tested is as follows: c is more than or equal to 0.20bar and less than or equal to 0.40bar, and the leakage rate of the engine oil channel to be detected is less than 170ccm/min, so that the engine oil channel to be detected is qualified.