A diesel engine fuel pump outlet pressure fluctuation elimination system

Abstract

The present application provides a diesel engine fuel pump outlet pressure fluctuation elimination system, which includes a first oil return pipeline, a second oil return pipeline, an oil return cooler and a throttling orifice plate; the two ends of the first oil return pipeline are respectively connected to one end of the engine high-pressure oil pump and one end of the oil return cooler; the two ends of the second oil return pipeline are respectively connected to the other end of the oil return cooler and one end of the throttling orifice plate; the other end of the throttling orifice plate is connected to one end of the daily fuel tank. The device adds damping to the diesel engine oil return pipeline, optimizes the distribution between combustion oil and return oil, increases oil return resistance, increases the outlet pressure of the diesel engine fuel pump outlet pressure fluctuation elimination system, improves outlet pressure fluctuation, and is easy to process and install.

Description

Technical Field

[0001] The present application relates to the field of ships, and in particular to a system for eliminating outlet pressure fluctuations of a diesel engine fuel pump. Background Art

[0002] The suction vacuum of the outlet pressure fluctuation elimination system of the marine diesel engine fuel pump is low, and a certain positive pressure is required at the inlet. However, during the installation of the ship power system equipment, due to the reasons such as the cabin height and the overall layout, the actual diesel engine pump fuel inlet and the daily fuel tank are limited in height, and the layout position is difficult to adjust. The outlet of the diesel engine fuel pump outlet pressure fluctuation elimination system has low pressure and pressure fluctuation, which leads to fluctuations in the diesel engine combustion oil volume and the combustion oil volume is lower than the normal value, reducing the diesel engine performance, poor equipment loading adaptability, and affecting the performance indicators of the whole ship. Therefore, under the condition of limited overall scale, it is necessary to increase the outlet pressure of the diesel engine fuel pump outlet pressure fluctuation elimination system to meet the actual needs of the diesel engine. At the same time, for the layout of the electromechanical compartment and the normal use of the diesel engine, the scheme of adjusting the fuel pipeline resistance is adopted, which is simple in principle and easy to process and install. The traditional scheme of adjusting the layout height of the diesel engine and the daily fuel tank is labor-intensive, and when the platform is a small ship, the overall scale is limited and the layout adjustment is difficult. Summary of the invention

[0003] One of the purposes of the present application is to provide a diesel engine fuel pump outlet pressure fluctuation elimination system to solve the problem that the outlet of the existing diesel engine fuel pump outlet pressure fluctuation elimination system is prone to pressure fluctuation.

[0004] The technical solution of this application is:

[0005] A diesel engine fuel pump outlet pressure fluctuation elimination system comprises a first oil return pipeline, a second oil return pipeline, an oil return cooler and a throttling orifice plate; the two ends of the first oil return pipeline are respectively connected to one end of the engine high-pressure oil pump and one end of the oil return cooler; the two ends of the second oil return pipeline are respectively connected to the other end of the oil return cooler and one end of the throttling orifice plate; the other end of the throttling orifice plate is connected to one end of a daily fuel tank.

[0006] As a technical solution of the present application, the daily fuel tank is connected to the oil pipeline through a quick-closing valve.

[0007] As a technical solution of the present application, an engine-driven fuel pump is installed on the oil pipeline, and its two ends are respectively connected to the other end of the daily fuel tank and the other end of the engine-driven high-pressure oil pump.

[0008] As a technical solution of the present application, a first stop valve is installed on the oil pipeline, and the first stop valve is located between the quick-closing valve and the engine-driven fuel pump.

[0009] As a technical solution of the present application, a second stop valve and a first temperature meter are sequentially installed on the first oil return pipeline.

[0010] As a technical solution of the present application, a third stop valve and a second temperature meter are sequentially installed on the second oil return pipeline.

[0011] As a technical solution of the present application, the throttling orifice plate is detachably mounted on the second oil return pipeline.

[0012] Beneficial effects of this application:

[0013] In the diesel engine fuel pump outlet pressure fluctuation elimination system of the present application, a throttling orifice plate is installed on the diesel engine return oil pipeline to increase damping, optimize the distribution between combustion oil and return oil, increase return oil resistance, and achieve the goal of increasing the outlet pressure of the diesel engine fuel pump outlet pressure fluctuation elimination system and improving outlet pressure fluctuation. The principle is simple and the processing and installation are convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the implementation methods of the present application, the drawings required for use in the implementation methods will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 Schematic diagram of a diesel engine fuel pump outlet pressure fluctuation elimination system provided in an embodiment of the present application.

[0016] Icons: 1-first oil return pipeline; 2-second oil return pipeline; 3-return oil cooler; 4-throttling orifice; 5-engine high-pressure oil pump; 6-daily fuel tank; 7-quick closing valve; 8-oil pipeline; 9-engine fuel pump; 10-first stop valve; 11-second stop valve; 12-first thermometer; 13-third stop valve; 14-second thermometer. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0018] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0019] 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, further definition and explanation thereof is not required in subsequent drawings.

[0020] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or the orientations or positional relationships in which the inventive product is usually placed when in use. These are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0021] In addition, in the present application, unless otherwise clearly specified and limited, the first feature being above or below the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, the first feature being above, above, and above the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being below, below, and below the second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0022] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0023] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "disposed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0024] Example:

[0025] Please refer to Figure 1The present application provides a diesel engine fuel pump outlet pressure fluctuation elimination system, which mainly includes a first oil return pipeline 1, a second oil return pipeline 2, an oil return cooler 3 and a throttling orifice 4; wherein, an oil transfer pipeline 8 is provided with an oil return pump 9, and both ends are respectively connected to one end of a daily fuel tank 6 and one end of an engine high-pressure oil pump 5; both ends of the first oil return pipeline 1 are respectively connected to the other end of the engine high-pressure oil pump 5 and one end of the oil return cooler 3; at the same time, both ends of the second oil return pipeline 2 are respectively connected to the other end of the oil return cooler 3 and one end of the throttling orifice 4; the other end of the throttling orifice 4 is connected to the other end of the daily fuel tank 6.

[0026] It should be noted that the daily fuel tank 6 is connected to the oil pipeline 8 through the quick-closing valve 7. At the same time, a first stop valve 10 is installed on the oil pipeline 8, and the first stop valve 10 is located between the quick-closing valve and the engine fuel pump 9. In addition, the throttle orifice plate 4 is detachably installed on the second oil return pipeline 2; the system can be adjusted by using throttle orifices 4 of different apertures according to different usage requirements.

[0027] In addition, a second stop valve 11 and a first thermometer 12 are sequentially installed on the first oil return pipeline 1. A third stop valve 13 and a second thermometer 14 are sequentially installed on the second oil return pipeline 2.

[0028] The engine-driven fuel pump 9 draws oil from the daily fuel tank 6 and transfers it to the engine-driven high-pressure oil pump 5. The engine-driven high-pressure oil pump 5 supplies the fuel for combustion inside the diesel engine to the injector, and the cooling fuel returns to the daily fuel tank 6 through the return oil cooler 3. The remaining fuel is discharged through the internal discharge port. This system can increase the outlet pressure of the engine-driven fuel pump 9. To improve the outlet pressure fluctuation, the throttling orifice plate 4 on the second return oil pipeline is used to adjust and optimize the distribution between the combustion oil and the cooling fuel, reduce the cooling fuel, increase the combustion fuel of another line to a normal value, increase the resistance along the circuit, and thus solve the problem of low pressure and pressure fluctuation, while reducing the cooling fuel. Figure 1 The first thermometer 12 and the second thermometer 14 shown are used to read the return oil temperature of the cooling fuel to ensure that the return oil temperature of the cooling fuel meets the equipment requirements.

[0029] At the same time, the throttling orifice plate 4 has a small size, a simple structure, and is easy to manufacture and install.

[0030] In addition, the system is subjected to multiple test verifications using throttling orifice plates 4 with different apertures, a test plan for installing throttling orifice plates 4 with different apertures on the unit is formulated, multiple test verifications are carried out, the oil level of the daily fuel tank 6 is adjusted to be basically equivalent to the height of the diesel engine fuel suction filter element, throttling orifice plates 4 with different apertures are formulated, and installed on the unit return oil pipeline for tests one by one, the diesel generator set device is loaded from 25%-50%-75%-100%, and the diesel engine fuel pressure values ​​at each point are recorded. After determining the diameter of the throttling orifice plate 4, the diesel generator set device is loaded from 0%-25%-50%-75%-100%-75%-50%-25%-0%, and each load point is operated for no less than 5 minutes, and the diesel engine fuel pressure values ​​at each point, the daily fuel oil level, the return oil back pressure and the return oil temperature are recorded.

[0031] According to the experimental results, after the throttling orifice plate 4 is installed, the diesel engine fuel system pressure, return oil back pressure and return oil temperature meet the equipment use requirements. Finally, the diesel engine with fuel pump outlet pressure fluctuation elimination system outlet fuel pressure, fuel return oil temperature and fuel return oil back pressure are normal under all working conditions, which can meet the normal operation requirements of the diesel engine under all working conditions.

[0032] In summary, it can be seen that in the diesel engine fuel pump outlet pressure fluctuation elimination system of the present application, a throttle orifice plate 4 is installed on the diesel engine return oil pipeline to increase damping, optimize the distribution between combustion oil and return oil, increase return oil resistance, and achieve the goal of increasing the outlet pressure of the diesel engine fuel pump outlet pressure fluctuation elimination system and improving outlet pressure fluctuations. The principle is simple and the processing and installation are convenient.

[0033] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A diesel engine fuel pump outlet pressure fluctuation elimination system, characterized in that: It comprises a first oil return pipeline, a second oil return pipeline, an oil return cooler and a throttling orifice plate; the two ends of the first oil return pipeline are respectively connected to one end of the engine-driven high-pressure oil pump and one end of the oil return cooler; the two ends of the second oil return pipeline are respectively connected to the other end of the oil return cooler and one end of the throttling orifice plate; the other end of the throttling orifice plate is connected to one end of the daily fuel tank; the throttling orifice plate is detachably mounted on the second oil return pipeline; the daily fuel tank is connected to the oil delivery pipeline through a quick-closing valve; the oil delivery pipeline is installed with an engine-driven fuel pump, and the two ends are respectively connected to the other end of the daily fuel tank and the other end of the engine-driven high-pressure oil pump; the oil delivery pipeline is installed with a first stop valve, and the first stop valve is located between the quick-closing valve and the engine-driven fuel pump.

2. The diesel engine fuel pump outlet pressure fluctuation elimination system according to claim 1, characterized in that: The first oil return pipeline is sequentially installed with a second stop valve and a first temperature gauge.

3. The diesel engine fuel pump outlet pressure fluctuation elimination system according to claim 1, characterized in that: The second oil return pipeline is sequentially installed with a third stop valve and a second temperature meter.

Images