System and method for detecting leakage of fuel pump bracket of medium-speed diesel engine

Abstract

The invention discloses a leakage detection system for a fuel pump bracket of a medium-speed diesel engine. The system comprises plane end face sealing assemblies, a water inlet end sealing assembly, a pump pressure assembly and a water source. The plane end face sealing assembly detachably seals all plane water holes of the fuel pump bracket. The water inlet end sealing assembly is detachably arranged at a water inlet in the top end of the fuel pump bracket in a sealed mode and provided with a water inlet ball valve. The water outlet end sealing assembly is detachably arranged at a water outlet in the other end of the fuel pump bracket in a sealed mode and provided with a water outlet ball valve. The pumping pressure assembly pumps water source pressure to a water inlet of the fuel pump bracket in an adjustable mode, and on-off of water supply is controlled through a water inlet ball valve of the water inlet end sealing assembly. The system is simple in structure, low in cost and convenient to operate, and can effectively detect whether the casting quality of the medium-speed diesel engine fuel pump bracket is qualified or not, improve the working efficiency and reduce the mass loss rate.

Description

Technical Field

[0001] The present invention relates to the technical field of engines, and particularly to a leakage detection system and method for a fuel pump bracket of a medium-speed diesel engine. Specifically, it is a system for inspecting the casting quality of a fuel pump bracket through a water pressure detection method, aiming to improve the detection efficiency of the casting quality of the fuel pump bracket and ensure its reliability and safety during the operation of the diesel engine. Background Art

[0002] As the core power device of large equipment such as ships and generator sets, the quality and reliability of the components of a diesel engine directly affect the operation efficiency and safety of the entire equipment. Each process should be strictly carried out in accordance with the requirements of the process and drawings. After the completion of one process, it must be strictly inspected by professional inspectors, and only after meeting the requirements can the next process be carried out. For each finished part, it is necessary to strive for perfection. The product quality of parts casting is particularly important, and the material of the fuel pump bracket, which bears important components, is cast iron. As an important load-bearing component of a diesel engine, the fuel pump bracket is usually manufactured by an integral casting process, and the material is mostly cast iron. Due to its complex structure and large bearing pressure, the casting quality of the fuel pump bracket is particularly important. If there are defects in the casting process, such as pores, cracks, etc., it may cause leakage of the fuel pump bracket during use, thereby affecting the normal operation of the diesel engine.

[0003] Currently, the detection of the casting quality of fuel pump brackets mainly relies on traditional visual inspection and non-destructive testing methods, such as ultrasonic testing, X-ray testing, etc. However, these methods have certain limitations: visual inspection is difficult to detect internal defects, while non-destructive testing methods are costly and complex to operate, and it is difficult to carry out rapid and efficient detection in mass production. In addition, the existing detection methods can often only be carried out after the fuel pump bracket is processed, and defects cannot be detected in time during the casting process, resulting in great difficulty in subsequent repair and even possible irreparable quality problems.

[0004] Therefore, there is an urgent need for a system and method that can quickly and efficiently detect after the fuel pump bracket is cast and before it is processed, so as to ensure that the casting quality of the fuel pump bracket meets the requirements and avoid leakage problems caused by casting defects. Summary of the Invention

[0005] In order to overcome the deficiencies of the prior art, the purpose of the present invention is to provide a leakage detection system and method for a fuel pump bracket of a medium-speed diesel engine. Through the water pressure detection method, the casting quality of the fuel pump bracket can be effectively inspected before processing, thereby reducing the quality loss rate, improving the production efficiency, and solving the quality problems caused by product leakage due to quality defects of the existing fuel pump bracket blanks.

[0006] The technical solution of the present invention is as follows:

[0007] A leakage detection system for a fuel pump bracket of a medium-speed diesel engine. The system includes a plane end face sealing assembly, a water inlet end sealing assembly, a water outlet end sealing assembly, a pump pressure assembly and a water source; the plane end face sealing assembly detachably seals the plane and water holes of the fuel pump bracket; the water inlet end sealing assembly is detachably and sealingly arranged at the water inlet of one end of the fuel pump bracket, and a water inlet ball valve is arranged; the water outlet end sealing assembly is detachably and sealingly arranged at the water outlet of the other end of the fuel pump bracket, and a water outlet ball valve is arranged; the pump pressure assembly pumps the water source pressure-adjustably to the water inlet of one end of the fuel pump bracket, and controls the on-off of the water supply through the water inlet ball valve of the water inlet end sealing assembly; and controls the on-off of the drainage through the water outlet ball valve on the water outlet end sealing assembly.

[0008] The bottom large plane sealing unit includes an end face flange, a gasket, a sealing rubber strip, bolts and nuts. The end face flange and the gasket are installed on the bottom large plane, and a sealing rubber strip is clamped between the bottom planes. At the same time, the flange and the top plane are fixed with bolts and nuts to ensure no gap.

[0009] The end face sealing unit includes an end face flange and a gasket, which are fixed on the end face of the fuel pump bracket with bolts to ensure no gap; the end face flange and the gasket, which are fixed on the end face of the fuel pump bracket with bolts to ensure no gap; the end face flange and the gasket, which are fixed on the end face of the fuel pump bracket with bolts to ensure no gap; the end face flange and the gasket, which are fixed on the end face of the fuel pump bracket with bolts to ensure no gap; the end face flange and the gasket, which are fixed on the end face of the fuel pump bracket with bolts to ensure no gap; the end face flange and the gasket, which are fixed on the end face of the fuel pump bracket with bolts to ensure no gap; the end face flange and the gasket, which are fixed on the end face of the fuel pump bracket with bolts to ensure no gap; the blanking plugs and the blanking plugs block the small holes of the fuel pump bracket to ensure no gap.

[0010] The water inlet end sealing assembly includes a plug and a water inlet ball valve. The plug is connected to the threaded hole, and the water inlet ball valve is arranged on the upper part of the plug and communicated with the water cavity.

[0011] The pump pressure assembly includes an electric pressure test pump, a filter, a rigid water pipe and a pressure gauge. One end of the electric pressure test pump is connected to the filter and the water source in sequence through the rigid water pipe, and the other end of the electric pressure test pump is connected to the pressure gauge and the water inlet ball valve in sequence through the rigid water pipe.

[0012] The detection method of the present invention is as follows:

[0013] Install the plane end face sealing assembly (100) on each plane and water holes of the fuel pump bracket to ensure no leakage in sealing;

[0014] Install the water inlet end sealing assembly (200) and the water outlet end sealing assembly (300) at the water inlet and water outlet of the fuel pump bracket respectively;

[0015] Connect the electric pressure test pump (27) to the inlet ball valve (19) through a rigid water pipe (26), and set a control switch on the water pipe;

[0016] Connect the water source (500) to the electric pressure test pump (27) through a filter (25).

[0017] Open the inlet ball valve (19), close the outlet ball valve (19), start the electric pressure test pump (27), and pump the water pressure to the inlet of the fuel pump bracket;

[0018] According to the CAE verification calculation results, adjust the injection pressure to 1.5 Bar and maintain the pressure for 20 minutes;

[0019] Observe the reading of the pressure gauge (28). If the pressure remains stable within 20 minutes, it indicates that the fuel pump bracket has no leakage and the casting quality is qualified;

[0020] If the pressure continues to decrease, it indicates that there are casting defects in the fuel pump bracket and repair is required.

[0021] After the detection is completed, turn off the electric pressure test pump (27), open the outlet ball valve (19), and drain the water in the fuel pump bracket;

[0022] Dismantle the inlet end seal assembly (200), the outlet end seal assembly (300) and the flat end face seal assembly (100) to complete the detection process.

[0023] The technical effects of the present invention are as follows:

[0024] Through the water pressure detection method, the present invention can quickly and efficiently inspect the casting quality of the fuel pump bracket before processing, avoiding the limitations of traditional detection methods. It solves the problem that it is impossible to inspect the casting quality of the fuel pump bracket of a medium-speed diesel engine before assembly and use.

[0025] The present invention realizes the advance inspection of the casting quality in the part processing link, avoiding the discovery of casting defects after the main engine is installed, resulting in oil leakage of the main engine, disassembly and repair. By using this inspection tool, the time and labor consumed in disassembling and assembling the main engine can be effectively reduced, and the time occupying the diesel engine test bench can be reduced.

[0026] The system of the present invention has a simple structure, low cost and convenient operation, can effectively reduce the quality loss rate, improve the production efficiency, and ensure the reliability and safety of the fuel pump bracket during the operation of the diesel engine. Brief Description of the Drawings

[0027] Figure 1 It is the front view of the leakage detection system for the fuel pump bracket of a medium-speed diesel engine of the present invention.

[0028] Figure 2 This is the rear view of the leakage detection system for the fuel pump bracket of a medium-speed diesel engine according to the present invention. Detailed implementation manners

[0029] The present invention will be further elaborated in detail below in conjunction with the drawings and embodiments, but the protection scope of the present invention cannot be limited thereby.

[0030] Please refer to Figure 1 , Figure 1 This is the front view of the leakage detection system for the fuel pump bracket of a medium-speed diesel engine according to the present invention. As shown in the figure, a leakage detection system for the fuel pump bracket of a medium-speed diesel engine includes the following components:

[0031] Flat end face seal assembly (100): used to seal the flat surface and water holes of the fuel pump bracket;

[0032] Inlet end seal assembly (200): used to seal the inlet of the fuel pump bracket and is provided with an inlet ball valve (19);

[0033] Outlet end seal assembly (300): used to seal the outlet of the fuel pump bracket and is provided with an outlet ball valve (19);

[0034] Pump pressure assembly (400): used to pump the pressure of the water source (500) to the inlet of the fuel pump bracket adjustably;

[0035] Water source (500): used to provide the water required for detection.

[0036] The flat end face seal assembly (100) includes a bottom large flat surface seal unit and an end face seal unit. Among them, the bottom large flat surface seal unit: consists of an end face flange (15), a gasket (16), a sealing rubber strip (20), bolts (23) and nuts (24). The end face flange (15) and the gasket (16) are installed on the bottom large flat surface of the fuel pump bracket, and a sealing rubber strip (20) is clamped between the bottom flat surfaces. The flange and the top flat surface are fixed through bolts (23) and nuts (24) to ensure no gap. The end face seal unit includes a plurality of end face flanges (1-14) and gaskets (6-14), which are fixed on each end face of the fuel pump bracket through bolts (22) to ensure no gap. In addition, blanking plugs (17, 18) are used to block the small holes on the fuel pump bracket to ensure the sealing performance.

[0037] The inlet end seal assembly (200) includes a plug (21) and an inlet ball valve (19). The plug (21) is connected to the threaded hole at the inlet of the fuel pump bracket; the inlet ball valve (19) is arranged on the upper part of the plug and communicated with the water cavity, and is used to control the on-off of the water supply.

[0038] The water outlet end sealing assembly (300) includes a plug (21) and a water outlet ball valve (19). The plug (21) is connected to the threaded hole of the water outlet of the fuel pump bracket; the water outlet ball valve (19) is arranged on the upper part of the plug and communicated with the water chamber, and is used to control the on-off of water drainage.

[0039] The pump pressure assembly (400) includes:

[0040] An electric pressure test pump (27): used to provide pressure, with the model DY-165 / 6, driven by a motor;

[0041] A filter (25): used to filter impurities in the water source to ensure clean water quality;

[0042] A rigid water pipe (26): used to connect the electric pressure test pump (27), the filter (25), the water source (500) and the inlet ball valve (19);

[0043] A pressure gauge (28): installed on the electric pressure test pump (27) to monitor the water pressure.

[0044] Specific parameters:

[0045] The sealing plug uses an M22×1.5 hexagon head bolt; the full thread bolts use M12×25 and M20×80 full thread bolts (GBT5783), and the nuts use M20 nuts (GBT6178); the inlet ball valve 19 uses a G3 / 4 ball valve; the outlet ball valve 19 uses a G11 / 2 ball valve; the model of the electric pressure test pump 11 is DY-165 / 6.

[0046] A control switch is set on the connecting water pipe, and a stainless steel pressure gauge is installed on the electric pressure test pump 27 for pressure monitoring

[0047] Among them, the electric pressure test pump 27 is driven by a motor pump.

[0048] Corresponding to the above detection system, a method for detecting water chamber leakage using the detection system is provided. The method includes:

[0049] Connect the test system. The water inlet is pressured through the electric pressure test pump 13 and enters through the inlet ball valve 19 (G3 / 4 ball valve) at the position close to the bottom sealing plug 21, and the water is discharged through the outlet ball valve 21 (G11 / 2 ball valve) on the top surface outlet flange. A control switch is set on the connecting rigid water pipe 15 of the electric pressure test pump 13. A stainless steel pressure 16 gauge is installed on the electric pressure test pump 13 for pressure monitoring.

[0050] Water pressure detection. The electric pressure test pump 13 pumps water for a certain period of time, and observe whether there is an obvious pressure drop during the water pumping process.

[0051] If there is a sudden pressure drop during continuous water pumping, it indicates a water leakage phenomenon. If the water pressure increases steadily and then remains constant, it indicates that there is no water leakage in the frame.

[0052] Among them, during the water pressure detection process, the pump pressure of the electric pressure test pump 13 is 1 Mpa, and the water pumping duration is 20 min.

[0053] It has now been verified by physical objects that through this system and method, it is possible to quickly detect whether the fuel pump bracket of a medium-speed diesel engine leaks water, and promptly find the oil leakage point for repair, avoiding the quality problem that the casting defects are only discovered after the machine is installed.

[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 foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A medium speed diesel engine fuel pump bracket leakage detection system, characterized in that: include: A plane end face sealing assembly (100) for detachably sealing a plane surface and a water hole of a fuel pump bracket; A water inlet end sealing assembly (200) is detachably and sealingly arranged at the water inlet of one end of the fuel pump bracket and is provided with a water inlet ball valve; A water outlet sealing assembly (300) is detachably and sealingly arranged at the water outlet of the other end of the fuel pump bracket and is provided with a water outlet ball valve; A pump pressure assembly (400) is used to pump the water source (500) to the water inlet of the fuel pump bracket with adjustable pressure, and to control the on and off of water supply through the water inlet ball valve of the water inlet end sealing assembly (200); The water source (500) is used to provide water required for detection.

2. The medium speed diesel engine fuel pump bracket leakage detection system according to claim 1, characterized in that: The planar end face sealing assembly (100) comprises a bottom large plane sealing unit and an end face sealing unit; The bottom large plane sealing unit comprises an end face flange (15), a gasket (16), a sealing strip (20), bolts (23) and nuts (24); the end face flange (15) and the gasket (16) are mounted on the bottom large plane of the fuel pump bracket, and a sealing strip (20) is sandwiched between the bottom planes; the flange is fixed to the top plane by bolts (23) and nuts (24) to ensure that there is no gap; The end face sealing unit comprises a plurality of end face flanges and gaskets, which are fixed to each end face of the fuel pump bracket by bolts (22) to ensure that there is no gap; and a plurality of plugs, which are used to block the small holes on the fuel pump bracket to ensure sealing.

3. The medium speed diesel engine fuel pump bracket leakage detection system according to claim 1, characterized in that: The water inlet sealing assembly (200) comprises a screw plug (21) and a water inlet ball valve (19); the screw plug (21) is connected to the threaded hole of the water inlet of the fuel pump bracket; the water inlet ball valve (19) is arranged on the upper part of the screw plug and communicated with the water cavity to control the on and off of water supply.

4. The medium speed diesel engine fuel pump bracket leakage detection system according to claim 1, characterized in that: The water outlet sealing assembly (300) comprises a screw plug (21) and a water outlet ball valve (19); the screw plug (21) is connected to the threaded hole of the water outlet of the fuel pump bracket; the water outlet ball valve (19) is arranged on the upper part of the screw plug and communicated with the water cavity to control the on and off of water drainage.

5. The medium speed diesel engine fuel pump bracket leakage detection system according to claim 1, characterized in that: The pump pressure assembly (400) comprises an electric pressure test pump (27), a filter (25), a rigid water pipe (26) and a pressure gauge (28); one end of the electric pressure test pump (27) is connected to the filter (25) and the water source (500) in sequence through the rigid water pipe (26); the other end of the electric pressure test pump (27) is connected to the pressure gauge (28) and the water inlet ball valve (19) in sequence through the rigid water pipe (26); the pressure gauge (28) is installed on the electric pressure test pump (27) and is used to monitor the water pressure.

6. A detection method for a medium-speed diesel engine fuel pump bracket leakage detection system using any one of claims 1-5, characterized in that: The steps include: Install the plane end face seal assembly (100) on each plane and water hole of the fuel pump bracket to ensure that the seal is leak-free; The water inlet sealing assembly (200) and the water outlet sealing assembly (300) are respectively installed at the water inlet and the water outlet of the fuel pump bracket; The electric pressure test pump (27) is connected to the water inlet ball valve (19) through a rigid water pipe (26), and a control switch is arranged on the water pipe; The water source (500) is connected to the electric pressure test pump (27) through the filter (25). Open the water inlet ball valve (19), close the water outlet ball valve (19), start the electric pressure test pump (27), and pump the water pressure to the water inlet of the fuel pump bracket; According to the CAE verification calculation results, the water injection pressure was adjusted to 1.5 Bar and the pressure was maintained for 20 minutes; Observe the reading of the pressure gauge (28). If the pressure remains stable within 20 minutes, it means that the fuel pump bracket has no leakage and the casting quality is qualified. If the pressure continues to drop, it means that there is a casting defect in the fuel pump bracket and it needs to be repaired. After the test is completed, the electric pressure test pump (27) is turned off, and the water outlet ball valve (19) is opened to drain the water in the fuel pump bracket; The water inlet end sealing assembly (200), the water outlet end sealing assembly (300) and the plane end face sealing assembly (100) are disassembled to complete the detection process.

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