CN214667663U

CN214667663U - Testing device for exhaust valve mechanism of marine low-speed diesel engine

Info

Publication number: CN214667663U
Application number: CN202121112030.3U
Authority: CN
Inventors: 蔡文涛; 曾向明
Original assignee: Shanghai Maritime University
Current assignee: Shanghai Maritime University
Priority date: 2021-05-24
Filing date: 2021-05-24
Publication date: 2021-11-09
Anticipated expiration: 2031-05-24

Abstract

The utility model discloses a marine low-speed diesel engine discharge valve mechanism's testing arrangement relates to the technical field of diesel engine application equipment, the on-line screen storage device comprises a base, the base upper end be provided with the oil tank, follow the oil tank in the diesel oil trend filter, oil heater, high-pressure pump, common rail and diesel engine have set gradually, oil heater and high-pressure pump between be provided with a temperature sensor, the diesel engine in be provided with cylinder and hydro-cylinder from top to bottom, the cylinder in be provided with fuel sprayer and discharge valve mechanism, discharge valve mechanism include intake pipe, valve rod and blast pipe, the outer surface cover of blast pipe be equipped with the filter, the outer surface cover of intake pipe be equipped with air flow sensor. The utility model discloses can realize the simulation to discharge valve working process to reach the check and the verification to discharge valve mechanism different parameter within a definite time, facilitate for going on smoothly of taking a trial run, and can save time and economic cost.

Description

Testing device for exhaust valve mechanism of marine low-speed diesel engine

Technical Field

The utility model belongs to diesel engine application apparatus field especially relates to a marine low-speed diesel engine vent valve mechanism's testing arrangement.

Background

The diesel engine is the main power source of boats and ships, and the performance of diesel engine has key influence to the seaworthiness of boats and ships. The exhaust valve mechanism is one of core components of the diesel engine, and the requirements on the dimensional accuracy and the position accuracy of the exhaust valve mechanism are high, so that the integral function test of the exhaust valve mechanism after the assembly is completed is very important. At present, the diesel engine is in the supporting in-process of production, when testing the performance of each subassembly, still lack some test devices, like this, the functional obstacle of some subassemblies only can show when the installation is accomplished, the test car is carried out, these defects or functional obstacle can not be known by operating personnel fast, not only can influence going on smoothly of test car, more time and economic cost have also been consumed, and then can influence the normal use and the operation of diesel engine, and give people and bring great puzzlement.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to the inconvenient technical problem who exists of foretell diesel engine exhaust valve subassembly test, provide a reasonable in design, simple structure, processing convenience and can effectively accomplish the test to discharge valve and promote the marine low-speed diesel engine exhaust valve mechanism's of experimental effect testing arrangement.

In order to achieve the purpose, the technical proposal adopted by the utility model is a testing device of the exhaust valve mechanism of the marine low-speed diesel engine, which comprises a base, the upper end of the base is provided with an oil tank, a filter, an oil heater, a high-pressure pump, a common rail and a diesel engine are sequentially arranged along the direction of diesel oil in the oil tank, a first temperature sensor is arranged between the oil heater and the high-pressure pump, the left side and the right side of the common rail are respectively provided with a pressure regulating valve and a pressure sensor, an air cylinder and an oil cylinder are arranged in the diesel engine up and down, an oil nozzle and an exhaust valve mechanism are arranged in the air cylinder, a piston is arranged in the oil cylinder, a displacement sensor is arranged on one side of the piston, the exhaust valve mechanism comprises an air inlet pipe, a valve rod and an exhaust pipe, the air inlet pipe is characterized in that a filter is sleeved on the outer surface of the air outlet pipe, and an air flow sensor is sleeved on the outer surface of the air inlet pipe.

Preferably, the diesel engine setting in the base upper end, oil tank and diesel engine between be provided with the coolant liquid case, the fuel sprayer surface be provided with respectively advance oil pipe and return oil pipe and link together with rail lower extreme both sides, two the valve rod run through hydro-cylinder upper end and set up in intake pipe and exhaust pipe, intake pipe and exhaust pipe between still be provided with exhaust gas recirculation valve.

Preferably, a second temperature sensor is further arranged at the joint of the cooling liquid tank and the oil cylinder, the oil return pipe is arranged at the geometric center of the upper end of the outer surface of the oil spray nozzle, the end of the oil return pipe is communicated with the oil tank, the oil inlet pipe is arranged on one side of the outer surface of the oil spray nozzle, and the end of the air inlet pipe is connected with the air pump.

Compared with the prior art, the utility model has the advantages and positive effects that,

1. the utility model provides a pair of marine low-speed diesel engine vent valve mechanism's testing arrangement, through oil tank, oil heater, high-pressure pump and the common rail etc. that sets up, the simulation to the discharge valve working process can be realized to mutually supporting of above-mentioned part to reach check and verify between the different parameters of discharge valve mechanism, facilitate for the test.

2. According to the exhaust valve mechanism testing device, the temperature and the pressure of diesel oil entering the exhaust valve cylinder body are adjusted and set through the first temperature sensor, the pressure adjusting valve and the pressure sensor, and then the test research of the opening and closing characteristics of the exhaust valve under different oil temperatures or oil pressures is completed; through the air flow sensor who sets up to the air flow in the diesel engine of control flow direction to the realization is to the pressure adjustment of discharge valve cylinder block internal compression air, and then obtains the influence to valve rod rising speed under the different pressure, the convenience is to discharge valve's further research.

3. The exhaust valve mechanism testing device can filter and adsorb particles in the exhaust gas through the arranged filter, so that the exhaust gas reaches the emission standard, and the environment is prevented from being polluted; through the exhaust gas recirculation valve who sets up, can switch on intake pipe and blast pipe, not only can reduce the nitrogen oxide that contains in the exhaust gas in the blast pipe, can also assist the intake pipe to carry out the gas transmission to the discharge valve cylinder, and then improve fuel economy.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.

FIG. 1 is a schematic structural diagram of a testing device for an exhaust valve mechanism of a marine low-speed diesel engine;

fig. 2 is a partial sectional view of the internal structure of the diesel engine.

Reference numerals: 1. a base; 2. a diesel engine; 21. an oil cylinder; 22. a cylinder; 211. a piston; 212. a displacement sensor; 221. an oil jet; 222. a valve stem; 3. an oil tank; 4. a filter; 5. an oil heater; 6. a first temperature sensor; 7. a high pressure pump; 8. a pressure regulating valve; 9. a common rail; 10. a pressure sensor; 11. an oil inlet pipe; 12. an oil return pipe; 13. a coolant tank; 131. a second temperature sensor; 14. an air inlet pipe; 141. an air flow sensor; 15. an exhaust pipe; 16. a filter; 17. an exhaust gas recirculation valve.

Detailed Description

In order to make the above objects, features and advantages of the present invention more clearly understood, the present invention will be further described with reference to the accompanying drawings and examples. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the present invention is not limited to the limitations of the specific embodiments of the present disclosure.

Referring to fig. 1 and 2, an embodiment of the present invention provides a testing device for a marine low-speed diesel engine vent valve mechanism, including a base 1 for supporting the testing device to ensure smooth operation of the testing device, an oil tank 3 disposed at the upper end of the base 1 for storing fuel oil to provide a power source for operation of the diesel engine 2, a filter 4, an oil heater 5, a high-pressure pump 7, a common rail 9 and the diesel engine 2 sequentially disposed along the diesel oil trend in the oil tank 3, the above components are the existing mature technologies, the functions of the components are not repeated herein, a first temperature sensor 6 disposed between the oil heater 5 and the high-pressure pump 7 for detecting the temperature of the fuel oil during transportation, and according to different needs of testing and in combination with the fuel oil temperature readings transmitted by the first temperature sensor 6, further the heating temperature of the oil heater 5 to the fuel oil can be controlled conveniently, the left side and the right side of the common rail 9 are respectively provided with a pressure regulating valve 8 and a pressure sensor 10, the pressure regulating valve 8 can be manually rotated according to the oil pressure transmitted by the pressure sensor 10 and the requirement of the test condition is combined, so that the oil pressure of the fuel oil entering the cylinder 22 can be controlled, in this way, the adjustment and the setting of the temperature and the pressure of the diesel oil entering the exhaust valve cylinder 22 can be realized through the mutual matching of the arranged first temperature sensor 6, the pressure regulating valve 8 and the pressure sensor 10, and further the test research of the opening and closing characteristics of the exhaust valve under different oil temperatures or oil pressures is completed, the cylinder 22 and the oil cylinder 21 are arranged up and down in the diesel engine 2, the diesel engine 2 is the same as the prior art, is an important component of the diesel engine 2, and the matching of the cylinder 22 and the exhaust valve can realize the starting of the diesel engine 2, and has the advantages of high power, good economic performance and the like, the cylinder 22 is internally provided with an oil nozzle 221 and an exhaust valve mechanism, the oil nozzle 221 can spray high-pressure fuel oil into the cylinder 22 in an atomized manner, which is beneficial to the sufficient combustion of the fuel oil, the oil cylinder 21 is internally provided with a piston 211, the piston 211 can convert the air pressure generated by the combustion into motion, one side of the piston 211 is provided with a displacement sensor 212, the displacement sensor 212 is used for measuring and recording the motion rule of an exhaust valve rod 222, outputting the test result, and further completing the test of the exhaust valve mechanism, so that the test accuracy is improved, the exhaust valve mechanism comprises an air inlet pipe 14, the valve rod 222 and an exhaust pipe 15, the valve rod 222 is an important part of an exhaust valve and is mainly used for transmission, the upper end of the exhaust valve mechanism is connected with the motion mechanism, the lower end of the exhaust valve rod directly drives a valve core to move, so that the suction and the exhaust of the gas are realized, the air pressure inside and outside the cylinder 22 is kept balanced to a certain degree, thereby ensuring the normal operation of the diesel engine 2, the surface cover of blast pipe 15 is equipped with filter 16, can filter and adsorb the granule in the waste gas, so that waste gas reaches emission standard, avoid the environment to receive the pollution, intake pipe 14 surface cover is equipped with air flow sensor 141, the air flow in the control flow direction diesel engine 2, thereby the realization is to the pressure adjustment of the internal compressed air of discharge valve cylinder 22, and then obtain the influence to valve rod 222 rising speed under the different pressure, the convenience is to discharge valve's further research.

The utility model discloses a theory of operation is: the oil heater 5 is started to heat the fuel oil in the oil tank 3, and the heating temperature of the oil heater 5 to the fuel oil can be conveniently controlled according to different testing requirements and by combining the fuel oil temperature readings transmitted by the first temperature sensor 6; after the set temperature is reached, the first temperature sensor 6 inputs a signal into an external controller (not shown in the figure), and after the controller receives the signal, the controller controls the air pump to work and enables the air to enter the air cylinder 22 of the diesel engine 2, and in the process, the air flow sensor 141 can control the air flow flowing into the diesel engine 2, so that the exhaust valve can be further researched; the valve rod 222 slowly descends to a lower dead point, the displacement sensor 212 inputs the position information of the exhaust valve rod 222 into an external controller, the high-pressure pump 7 is started after the external controller obtains a signal that the exhaust valve rod 222 reaches the lower dead point, fuel flows through the common rail 9 and is sprayed into the cylinder 22 through the fuel spray nozzle 221, in the process, the pressure sensor 10 detects the transmitted oil pressure in real time, and the pressure regulating valve 8 can be manually rotated according to the requirement of a test condition, so that the oil pressure of the fuel entering the cylinder 22 is controlled; at the moment, the piston 211 moves upwards to compress air, and the exhaust valve rod 222 moves upwards under the pushing of the piston 211, so that the exhaust valve mechanism enters a test working state; the exhaust valve rod 222 reaches the top dead center, the displacement sensor 212 inputs the position information of the exhaust valve rod 222 into an external controller, the external controller obtains a signal that the exhaust valve rod 222 reaches the top dead center, the common rail 9 is controlled to draw back the fuel in the fuel injection nozzle 221, meanwhile, under the combined action of a valve spring in an exhaust valve mechanism of the diesel engine 2, the exhaust valve rod 222 descends, the exhaust gas generated in the cylinder 22 is discharged to the atmospheric environment through the exhaust pipe 15, and when the exhaust gas flows through the filter 16, particles in the exhaust gas can be filtered and adsorbed. Further, in the above process: through the mutual matching of the oil tank 3, the oil heater 5, the high-pressure pump 7, the common rail 9 and the like, the simulation of the working process of the exhaust valve can be realized, so that the checking and verification of different parameters of the exhaust valve mechanism can be realized, and the test is facilitated; the temperature and the pressure of diesel oil entering the exhaust valve cylinder 22 are regulated and set through the arranged first temperature sensor 6, the pressure regulating valve 8 and the pressure sensor 10, and then the test research of the opening and closing characteristics of the exhaust valve under different oil temperatures or oil pressures is completed; the air flow flowing into the diesel engine 2 is controlled by the arranged air flow sensor 141, so that the pressure of compressed air in the exhaust valve cylinder 22 is adjusted, the influence on the rising speed of the valve rod 222 under different pressures is further obtained, and further research on the exhaust valve is facilitated; through the filter 16, the waste gas can reach the emission standard, and the environment is prevented from being polluted; the intake pipe 14 and the exhaust pipe 15 are connected by the exhaust gas recirculation valve 17, so that nitrogen oxides contained in the gas discharged from the exhaust pipe 15 can be reduced, the intake pipe 14 can be assisted to convey the gas to the exhaust valve cylinder 22, and the fuel economy is improved.

In order to improve the stability of the diesel engine 2 when placed, the diesel engine 2 is arranged at the upper end of the base 1, in order to protect the normal and good operation of the diesel engine 2, a cooling liquid tank 13 is arranged between the oil tank 3 and the diesel engine 2, the cooling liquid circulates in the water tank of the diesel engine 2, and the effects of freezing prevention, boiling prevention, corrosion prevention and the like are achieved, in order to realize convenient transportation and backflow of fuel oil, an oil inlet pipe 11 and an oil return pipe 12 are respectively arranged on the outer surface of the oil nozzle 221 and are connected with two sides of the lower end of a common rail 9, two valve rods 222 penetrate through the upper end of the oil cylinder 21 and are arranged in the air inlet pipe 14 and the exhaust pipe 15, so that the valve rods 222 move more smoothly, the working process is improved, an exhaust gas recirculation valve 17 is further arranged between the air inlet pipe 14 and the exhaust pipe 15, the air inlet pipe 14 and the exhaust pipe 15 can be communicated, the gas contained in the gas exhausted from the exhaust pipe 15 can be reduced, and the air inlet pipe 14 can assist in transporting nitrogen oxides to the exhaust valve cylinder 22, thereby improving fuel economy.

In order to facilitate understanding of the operating condition of the diesel engine 2, a second temperature sensor 131 is further provided at the junction of the coolant tank 13 and the cylinder 21, and is capable of detecting the temperature of the coolant of the diesel engine 2 in real time, detecting the temperature of the coolant of the engine, inputting a temperature signal to an external device as a correction signal for fuel injection and ignition timing, meanwhile, the oil return pipe 12 is also a control signal of other control systems, in order to improve the reasonability of the design of the device, the geometric center of the upper end of the outer surface of the oil nozzle 221 is arranged, the end part of the oil return pipe is communicated with the oil tank 3, the oil inlet pipe 11 is arranged on one side of the outer surface of the oil nozzle 221, as in the prior art, the fuel oil is convenient to convey and has strong practicability, the end part of the air inlet pipe 14 is connected with an air pump (not shown in the figure), the air pump conveys fresh air to the exhaust valve, to complete the intake process at the piston 211 of the diesel engine 2, thereby effectively facilitating the performance of the test.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in other forms, and any person skilled in the art may use the above-mentioned technical contents to change or modify the equivalent embodiment into equivalent changes and apply to other fields, but any simple modification, equivalent change and modification made to the above embodiments according to the technical matters of the present invention will still fall within the protection scope of the technical solution of the present invention.

Claims

1. A testing device for a marine low-speed diesel engine exhaust valve mechanism comprises a base (1), wherein an oil tank (3) is arranged at the upper end of the base (1), a filter (4), an oil heater (5), a high-pressure pump (7), a common rail (9) and a diesel engine (2) are sequentially arranged along the diesel trend in the oil tank (3), and the testing device is characterized in that a first temperature sensor (6) is arranged between the oil heater (5) and the high-pressure pump (7), the left side and the right side of the common rail (9) are respectively provided with a pressure regulating valve (8) and a pressure sensor (10), an air cylinder (22) and an oil cylinder (21) are arranged in the diesel engine (2) from top to bottom, an oil nozzle (221) and an exhaust valve mechanism are arranged in the air cylinder (22), a piston (211) is arranged in the oil cylinder (21), a displacement sensor (212) is arranged on one side of the piston (211), exhaust valve mechanism include intake pipe (14), valve rod (222) and blast pipe (15), blast pipe (15) surface cover be equipped with filter (16), intake pipe (14) surface cover be equipped with air flow sensor (141).

2. The testing device of the marine low-speed diesel engine exhaust valve mechanism according to claim 1, characterized in that the diesel engine (2) is arranged at the upper end of the base (1), a coolant tank (13) is arranged between the oil tank (3) and the diesel engine (2), the outer surface of the oil nozzle (221) is respectively provided with an oil inlet pipe (11) and an oil return pipe (12) and connected with both sides of the lower end of the common rail (9), the two valve rods (222) penetrate through the upper end of the oil cylinder (21) and are arranged in the air inlet pipe (14) and the exhaust pipe (15), and an exhaust gas recirculation valve (17) is further arranged between the air inlet pipe (14) and the exhaust pipe (15).

3. The testing device of the marine low-speed diesel engine exhaust valve mechanism according to claim 2, characterized in that a second temperature sensor (131) is further arranged at the joint of the cooling liquid tank (13) and the oil cylinder (21), the oil return pipe (12) is arranged at the geometric center of the upper end of the outer surface of the oil nozzle (221) and the end of the oil return pipe is communicated with the oil tank (3), the oil inlet pipe (11) is arranged on one side of the outer surface of the oil nozzle (221), and the end of the air inlet pipe (14) is connected with the air pump.