Diesel engine fuel oil leakage detection device

Abstract

The utility model relates to the technical field of detection equipment, in particular to a diesel engine fuel oil leakage detection device. The diesel engine fuel oil leakage detection device comprises a gas mixing assembly, a detection pipeline, a diesel engine and a detector, one end of the detection pipeline is connected with the gas mixing assembly, the other end of the detection pipeline is connected with an oil pipe of the diesel engine, the gas mixing assembly can mix helium and air, and the detector is used for detecting the helium concentration of each cylinder body of the diesel engine. The diesel engine fuel oil leakage detection device can rapidly and accurately judge whether one or more leakage points exist in the fuel oil pipeline or not, can accurately judge the specific positions of the leakage points according to the helium concentration near the leakage points, improves the detection efficiency, and is safe and reliable in the detection process and free of pollution to the environment.

Description

Technical Field

[0001] The utility model relates to the technical field of detection equipment, in particular to a diesel engine fuel leakage detection device. Background Art

[0002] The diesel engine's fuel injection pump, high-pressure fuel pipe, and oil return pipe are built into the cylinder head. Oil return is used to cool the cylinder block. Fuel leaks during operation can contaminate and dilute the engine oil. Failure to locate the leak promptly and accurately can lead to cylinder scuffing, resulting in increased repair costs.

[0003] Existing diesel engine fuel line leak inspections primarily rely on visual inspection, a method whose effectiveness depends on the operator's experience. While poor sealing in high-pressure fuel lines is relatively easy to detect visually, damage to low-pressure fuel line joints, gaskets, and fuel lines is more difficult to detect directly. Especially when a fuel pump leaks, visual inspection often fails to reveal the leak point, requiring the fuel line to be removed, cleaned, and inspected for wear or damage. After a leak occurs, maintenance personnel often face days of extensive leak inspections, resulting in significant workload and low maintenance efficiency. Utility Model Content

[0004] The purpose of the utility model is to provide a diesel engine fuel leakage detection device to alleviate the problem that the existing diesel engine fuel pipeline leakage inspection cannot quickly and accurately determine the leakage point.

[0005] In order to solve the above technical problems, the technical solution provided by the present invention is:

[0006] A diesel engine fuel leak detection device comprises: an air mixing component, a detection pipeline, a diesel engine, and a detector. One end of the detection pipeline is connected to the air mixing component, and the other end is connected to the oil pipe of the diesel engine. The air mixing component can mix helium with air. The detector is used to detect the helium concentration in each cylinder of the diesel engine.

[0007] Furthermore, the gas mixing assembly includes a helium tank, an air compressor, a gas mixing tank and a gas mixing pipeline, the gas mixing tank has an air inlet joint and a gas outlet joint, the helium tank and the air compressor are connected to the air inlet joint through the gas mixing pipeline, and the gas outlet joint is connected to the detection pipeline.

[0008] Furthermore, the gas mixing pipeline includes a helium tube, an air tube and a gas mixing tube, one end of the helium tube is connected to the helium tank, and the other end is connected to the gas mixing tube, one end of the air tube is connected to the air compressor, and the other end is connected to the gas mixing tube, and the end of the gas mixing tube away from the helium tube is connected to the air inlet joint.

[0009] Furthermore, the helium pipe is provided with a first flow regulating valve.

[0010] Furthermore, the air pipe is provided with a second flow regulating valve.

[0011] Furthermore, the gas mixing tank is connected to a pressure gauge.

[0012] Furthermore, the detection pipeline includes an air supply pipe, an air intake pipe and an air return pipe, the diesel engine has an oil inlet joint and an oil return joint, the air supply pipe is connected to the air outlet joint, the air intake pipe and the air return pipe are both connected to the air supply pipe, the end of the air intake pipe away from the air supply pipe is connected to the oil inlet joint, and the end of the air return pipe away from the air supply pipe is connected to the oil return joint.

[0013] Furthermore, the gas pipeline is provided with a third flow regulating valve.

[0014] Furthermore, the detector includes a gas detection sensor, a pumping mechanism, a sampling circuit and a display alarm circuit. The pumping mechanism is connected to the gas detection sensor, and the sampling circuit and the display alarm circuit are both electrically connected to the gas detection sensor.

[0015] Furthermore, the gas detection sensor is an electrochemical helium sensor.

[0016] The utility model brings at least the following beneficial effects:

[0017] The utility model provides a diesel engine fuel leak detection device, comprising: an air mixing component, a detection pipeline, a diesel engine and a detector. One end of the detection pipeline is connected to the air mixing component, and the other end is connected to the oil pipe of the diesel engine. The air mixing component can mix helium with air, and the detector is used to detect the helium concentration in each cylinder of the diesel engine.

[0018] The mixing assembly mixes helium with air, which is then transported to the diesel engine via a test line. The helium concentration in the fuel lines and high-pressure fuel pump of each cylinder of the diesel engine is then tested with a detector, allowing for rapid and accurate analysis of fuel line leaks. To use the system, disconnect the diesel engine's inlet and return fuel line connectors, connect the test line to the connector, and inject the helium-air mixture into the diesel engine through the test line. Then, open the cylinder heads of each cylinder and use the detector to check the helium concentration in the fuel lines and high-pressure fuel pump of each cylinder. When helium is leaking from a leak, the helium concentration near that leak is higher. This concentration also changes with distance, allowing the leak to be quickly located.

[0019] The diesel engine fuel leak detection device can quickly and accurately determine whether there are one or more leaks in the fuel line, and can accurately determine the specific location of the leak based on the helium concentration near the leak point, thereby improving detection efficiency, ensuring a safe and reliable detection process, and being environmentally friendly.

[0020] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in related technologies, the following briefly introduces the drawings required for use in the specific implementation methods or related technical descriptions. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 This is a schematic diagram of a diesel engine fuel leak detection device provided by an embodiment of the present utility model.

[0023] icon:

[0024] 100-Gas mixing assembly; 110-Helium tank; 120-Air compressor; 130-Gas mixing tank; 140-Gas mixing pipeline; 141-Helium pipe; 142-Air pipe; 143-Gas mixing pipe; 150-First flow control valve; 160-Second flow control valve; 170-Pressure gauge; 200-Detection pipeline; 210-Gas supply pipe; 220-Inlet pipe; 230-Return pipe; 240-Third flow control valve; 300-Diesel engine; 310-Oil inlet connector; 320-Oil return connector; 400-Detector. DETAILED DESCRIPTION

[0025] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0026] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not require further definition or explanation in subsequent drawings.

[0027] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. Physical quantities in formulas, unless separately marked, should be understood as basic quantities of the International System of Units, or derived quantities derived from basic quantities through mathematical operations such as multiplication, division, differentiation or integration.

[0028] Furthermore, terms such as "horizontal," "vertical," and "overhanging" do not necessarily imply that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0029] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0030] The following embodiments of the present invention are described in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0031] Example 1

[0032] Existing diesel engine fuel line leak inspections primarily rely on visual inspection, a method whose effectiveness depends on the operator's experience. While poor sealing in high-pressure fuel lines is relatively easy to detect visually, damage to low-pressure fuel line joints, gaskets, and fuel lines is more difficult to detect directly. Especially when a fuel pump leaks, visual inspection often fails to reveal the leak point, requiring the fuel line to be removed, cleaned, and inspected for wear or damage. After a leak occurs, maintenance personnel often face days of extensive leak inspections, resulting in significant workload and low maintenance efficiency.

[0033] In view of this, an embodiment of the present invention provides a diesel engine fuel leak detection device, including: a mixing component 100, a detection pipeline 200, a diesel engine 300 and a detector 400. One end of the detection pipeline 200 is connected to the mixing component 100, and the other end is connected to the oil pipe of the diesel engine 300. The mixing component 100 can mix helium and air, and the detector 400 is used to detect the helium concentration in each cylinder of the diesel engine 300.

[0034] The mixing assembly 100 mixes helium with air, which is then transported to the diesel engine 300 via the detection line 200. The helium concentration in the fuel lines and high-pressure fuel pump of each cylinder of the diesel engine 300 is then tested using a detector 400, allowing for rapid and accurate analysis of fuel line leaks. During use, the inlet and return fuel line connections of the diesel engine 300 cylinders are first disconnected, and the detection line 200 is connected to the connection. The helium-air mixture is then injected into the diesel engine 300 via the detection line 200. The cylinder heads of each cylinder are then opened, and the helium concentration in each cylinder's fuel line and high-pressure fuel pump is checked using the detector 400. When helium is leaking from a leak, the helium concentration near that leak is higher. This concentration also changes with distance, allowing the leak to be quickly located.

[0035] The diesel engine fuel leak detection device can quickly and accurately determine whether there are one or more leaks in the fuel line, and can accurately determine the specific location of the leak based on the helium concentration near the leak point, thereby improving detection efficiency, ensuring a safe and reliable detection process, and being environmentally friendly.

[0036] In an optional manner of this embodiment, the gas mixing assembly 100 includes a helium tank 110, an air compressor 120, a gas mixing tank 130 and a gas mixing pipeline 140. The gas mixing tank 130 has an air inlet connector and an air outlet connector. The helium tank 110 and the air compressor 120 are connected to the air inlet connector through the gas mixing pipeline 140, and the air outlet connector is connected to the detection pipeline 200.

[0037] Argon and helium, two inert gases, are currently commonly used in applications such as high-altitude balloons and welding gas shielding. Both gases are used in large quantities, are inexpensive, easily available, and offer excellent stability. The corresponding detection sensors are relatively mature and reliable. Therefore, these two gases were used in the inert gas selection test, with comparisons made based on filling method, cost-effectiveness, and detection sensitivity. Helium is superior to argon in terms of detection accuracy, air content, and cost, so this embodiment uses helium as the test gas source. During testing, the helium tank 110 is first opened to fill the mixing tank 130 with a certain flow of helium. The air compressor 120 is then turned on to supply air to the mixing tank 130, pressurizing the helium and air for mixing. After mixing for one minute, the mixed gas in the mixing tank 130 is injected into the diesel engine 300 through the detection line 200.

[0038] In an optional manner of this embodiment, the gas mixing pipeline 140 includes a helium tube 141, an air tube 142 and a gas mixing tube 143. One end of the helium tube 141 is connected to the helium tank 110, and the other end is connected to the gas mixing tube 143. One end of the air tube 142 is connected to the air compressor 120, and the other end is connected to the gas mixing tube 143. The end of the gas mixing tube 143 away from the helium tube 141 is connected to the air inlet connector.

[0039] See Figure 1 The helium in the helium tank 110 enters the mixing pipe 143 through the helium pipe 141 and then flows into the mixing tank 130; the compressed air from the air compressor 120 enters the mixing pipe 143 through the air pipe 142 and then flows into the mixing tank 130 to be pressurized and mixed with the helium. The leak point of the diesel engine 300 fuel pipeline is generally small. Therefore, during the test process, the higher the pressure of the helium added, the easier the leak point is to detect. However, the pressure of the gas in the mixing tank 130 is limited, and a stable test pressure needs to be ensured. In addition, in theory, the higher the purity of the helium added, the more conducive it is to detection, but the cost of using high-purity helium is relatively high. Therefore, this embodiment uses a certain proportion of mixed gas to reduce the cost of detection.

[0040] In an optional embodiment of this embodiment, the helium pipe 141 is provided with a first flow regulating valve 150 .

[0041] See Figure 1 The flow rate of helium can be adjusted by the first flow regulating valve 150, and a certain flow rate of helium can be controlled as needed.

[0042] In an optional embodiment of this embodiment, the air pipe 142 is provided with a second flow regulating valve 160 .

[0043] See Figure 1 The flow rate of the compressed air can be adjusted by the second flow regulating valve 160, and a certain flow rate of compressed air and helium can be added and mixed as needed.

[0044] In an optional embodiment of this embodiment, the gas mixing tank 130 is connected to a pressure gauge 170 .

[0045] See Figure 1 After the mixed gas is injected into the oil inlet pipe and the oil return pipe of the diesel engine 300, the pressure gauge 170 can be used to check whether the pressure changes.

[0046] In an optional method of this embodiment, the detection pipeline 200 includes an air supply pipe 210, an air intake pipe 220 and an air return pipe 230. The diesel engine 300 has an oil inlet joint 310 and an oil return joint 320. The air supply pipe 210 is connected to the air outlet joint. The air intake pipe 220 and the air return pipe 230 are both connected to the air supply pipe 210. The end of the air intake pipe 220 away from the air supply pipe 210 is connected to the oil inlet joint 310, and the end of the return pipe 230 away from the air supply pipe 210 is connected to the oil return joint 320.

[0047] See Figure 1 The mixed gas flows from the gas supply pipe 210 through the intake pipe 220 and into the diesel engine 300 via the fuel inlet connector 310. After circulating, the gas passes through the fuel return connector 320 and the gas return pipe 230 into the gas supply pipe 210. The cylinder heads of each cylinder of the diesel engine 300 are opened, and the helium concentration in each cylinder's fuel line and high-pressure fuel pump is checked using a detector 400. When helium leaks from a leak, the helium concentration near the leak is higher. The helium concentration also changes with distance, allowing the leak to be quickly located.

[0048] In an optional embodiment of this embodiment, the gas delivery pipe 210 is provided with a third flow regulating valve 240 .

[0049] See Figure 1 The flow rate of the mixed gas can be adjusted by the third flow regulating valve 240, and the mixed gas can be added at a certain flow rate as needed.

[0050] In an optional manner of this embodiment, the detector 400 includes a gas detection sensor, a pumping mechanism, a sampling circuit and a display alarm circuit. The pumping mechanism is connected to the gas detection sensor, and the sampling circuit and the display alarm circuit are both electrically connected to the gas detection sensor.

[0051] The pumping mechanism adopts the pumping measurement method to improve the measurement speed and sensitivity. The sampling circuit can meet the stabilization time of no more than one minute and the response time of 5 to 10 seconds, ensuring that the gas concentration changes can be accurately collected, so as to quickly determine the leakage location and display and alarm through the display alarm circuit.

[0052] In an optional manner of this embodiment, the gas detection sensor is an electrochemical helium sensor. Since the leakage point of the diesel engine 300 pipeline is small and the leakage amount is difficult to detect, a sensor with higher measurement accuracy is selected.

[0053] The diesel engine fuel leak detection device is used as follows: First, disconnect the fuel inlet and return lines of the diesel engine 300 cylinder block and connect the detection line 200 to the connection. A controlled flow of helium is then added to the mixing tank 130. Then, the compressed air and helium are pressurized and mixed using the air compressor 120 within the mixing tank 130. After mixing for one minute, the mixed gas is injected into the diesel engine 300. The cylinder heads of each cylinder are opened, and the helium concentration in each cylinder's fuel lines and high-pressure fuel pump is checked using the detector 400. When helium is leaking from a leak, the helium concentration near the leak is higher. The helium concentration also varies with distance, allowing the leak to be quickly located.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A diesel engine fuel leak detection device, characterized in that: include: A gas mixing component, a detection pipeline, a diesel engine and a detector. One end of the detection pipeline is connected to the gas mixing component, and the other end is connected to the oil pipe of the diesel engine. The gas mixing component can mix helium with air. The detector is used to detect the helium concentration in each cylinder of the diesel engine.

2. The diesel engine fuel leakage detection device according to claim 1, characterized in that: The gas mixing assembly includes a helium tank, an air compressor, a gas mixing tank and a gas mixing pipeline. The gas mixing tank has an air inlet joint and a gas outlet joint. The helium tank and the air compressor are connected to the air inlet joint through the gas mixing pipeline. The gas outlet joint is connected to the detection pipeline.

3. The diesel engine fuel leakage detection device according to claim 2, characterized in that: The gas mixing pipeline includes a helium tube, an air tube and a gas mixing tube. One end of the helium tube is connected to the helium tank, and the other end is connected to the gas mixing tube. One end of the air tube is connected to the air compressor, and the other end is connected to the gas mixing tube. The end of the gas mixing tube away from the helium tube is connected to the air inlet joint.

4. The diesel engine fuel leakage detection device according to claim 3, characterized in that: The helium pipe is provided with a first flow regulating valve.

5. The diesel engine fuel leakage detection device according to claim 4, characterized in that: The air pipe is provided with a second flow regulating valve.

6. The diesel engine fuel leakage detection device according to claim 2, characterized in that: The gas mixing tank is connected with a pressure gauge.

7. The diesel engine fuel leakage detection device according to claim 2, characterized in that: The detection pipeline includes an air supply pipe, an air intake pipe and an air return pipe. The diesel engine has an oil inlet joint and an oil return joint. The air supply pipe is connected to the air outlet joint. The air intake pipe and the air return pipe are both connected to the air supply pipe. The end of the air intake pipe away from the air supply pipe is connected to the oil inlet joint, and the end of the air return pipe away from the air supply pipe is connected to the oil return joint.

8. The diesel engine fuel leakage detection device according to claim 7, characterized in that: The gas delivery pipe is provided with a third flow regulating valve.

9. The diesel engine fuel leakage detection device according to claim 1, characterized in that: The detector includes a gas detection sensor, a pumping mechanism, a sampling circuit and a display alarm circuit. The pumping mechanism is connected to the gas detection sensor. The sampling circuit and the display alarm circuit are both electrically connected to the gas detection sensor.

10. The diesel engine fuel leakage detection device according to claim 9, characterized in that: The gas detection sensor is an electrochemical helium sensor.

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