Crankcase discharge system of high-horsepower engine

Abstract

The utility model discloses a high-horsepower engine crankcase emission system, and relates to the field of engine crankcase emission, the high-horsepower engine crankcase emission system comprises an emission pipeline, a heating assembly and a temperature control module, the emission pipeline is communicated between a crankcase emission port and an engine tail gas treatment system, and the heating assembly is communicated with the temperature control module. The exhaust pipeline is arranged in the crankcase, the heating assembly is arranged on the exhaust pipeline, the heating assembly is used for heating the exhaust pipeline, and the temperature control module is used for controlling the heating assembly so that tail gas in the exhaust pipeline can be kept at the specified temperature. Tail gas generated by the crankcase is not directly discharged into the surrounding environment, the temperature of the discharging pipeline is kept above the dew point of the tail gas of the crankcase through the heating assembly and the temperature control module, and condensate water is prevented from being generated in the test process.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of engine crankcase emission, more particularly to a high -power engine crankcase emission system. BACKGROUND

[0002] High -power engines are widely used in various fields such as industry, agriculture and transportation, especially in heavy machinery, ships and generator sets. In recent years, with the continuous tightening of environmental protection regulations, especially the continuous improvement of emission standards for non-road mobile machinery and ship engines, the requirements for engine emission control are increasingly strict. GB20891-2014 "Non-road Mobile Machinery Diesel Engine Exhaust Emission Limit and Measurement Method (China Third, Fourth Stage)" and GB15097-2016 "Ship Engine Exhaust Emission Limit and Measurement Method (China First, Second Stage)" clearly stipulate the requirements of crankcase emission, aiming to reduce environmental pollution and improve the overall performance and reliability of the engine.

[0003] In summary, how to avoid the direct emission of crankcase pollutants into the air is a problem that needs to be solved by the technical personnel in the field. UTILITY MODEL CONTENT

[0004] Therefore, the utility model aims to provide a high -power engine crankcase emission system, which effectively avoids the direct emission of crankcase pollutants into the air.

[0005] In order to achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0006] A high -power engine crankcase emission system, comprising:

[0007] An emission pipeline is communicated between the crankcase emission port and the engine exhaust treatment system;

[0008] A heating assembly is arranged on the emission pipeline, and the heating assembly is used for heating the emission pipeline;

[0009] A temperature control module is used for controlling the heating assembly to keep the exhaust gas in the emission pipeline at a specified temperature.

[0010] Preferably, the emission pipeline comprises a first connecting section, a variable diameter section and a second connecting section connected in sequence, one end of the first connecting section away from the variable diameter section is communicated with the crankcase emission port, and one end of the second connecting section away from the variable diameter section is communicated with the engine exhaust treatment system.

[0011] Preferably, the variable diameter section is a straight pipe section, and a flow meter is arranged at the variable diameter section to detect the exhaust flow at the variable diameter section.

[0012] Preferably, the connection between the first connecting section and the crankcase vent is a high-temperature resistant hose, which is a silica gel hose.

[0013] Preferably, an insulation structure is arranged on the pipeline of the second connecting section to insulate the exhaust in the second connecting section.

[0014] Preferably, the insulation structure comprises an aluminum silicate pipe shell sleeved on the pipeline of the second connecting section.

[0015] Preferably, the heating assembly comprises a heating belt wound on the exhaust pipeline, and the laying length of the heating belt is set according to the laying length of the exhaust pipeline.

[0016] Preferably, the temperature control module comprises a temperature controller and a temperature sensor arranged on the exhaust pipeline, and the temperature controller is electrically connected with the temperature sensor and the heating assembly.

[0017] Preferably, the exhaust pipeline is made of a sanitary-grade stainless steel pipe.

[0018] The large-displacement engine crankcase venting system comprises an exhaust pipeline, a heating assembly and a temperature control module, the exhaust pipeline is connected between a crankcase vent and an engine exhaust treatment system, the heating assembly is arranged on the exhaust pipeline, the heating assembly is used for heating the exhaust pipeline, and the temperature control module is used for controlling the heating assembly to keep the exhaust in the exhaust pipeline at a specified temperature.

[0019] The large-displacement engine crankcase venting system provided in the application uses the exhaust pipeline to convey the exhaust from the crankcase venting to the engine exhaust treatment system for exhaust treatment, so that the exhaust from the crankcase is not directly discharged into the surrounding environment, and the heating assembly and the temperature control module are used to keep the temperature of the exhaust pipeline above the dew point of the exhaust from the crankcase, so that condensate is avoided in the test process. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the provided drawings.

[0021] Figure 1Fig. 1 is a schematic diagram of a large horsepower engine crankcase exhaust system in the embodiment of the present application.

[0022] Figure 2 Fig. 2 is a layout diagram of an exhaust pipe in the embodiment of the present application.

[0023] Figure 3 Fig. 3 is an electrical diagram of a temperature control module in the embodiment of the present application.

[0024] Figures 1-3 In the drawings, reference numerals include:

[0025] 1, exhaust pipe; 11, first connecting section; 12, reducing section; 13, second connecting section;

[0026] 2, heating assembly; 21, heating belt; 3, temperature control module; 4, aluminum silicate pipe shell; 5, engine exhaust treatment system; 6, flow meter; 7, high-temperature resistant hose. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0028] Unless otherwise defined, the technical terms or scientific terms used in the present application should be understood as the common meanings understood by those skilled in the art to which the present application belongs. The terms "first", "second", and similar terms used in the present application do not represent any order, number, or importance. The terms "connected" or "connected" and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right", and the like are only used to represent relative positional relationships, and when the absolute positions of the described objects are changed, the relative positional relationships can also be changed accordingly. The embodiments of the present application disclose a large horsepower engine crankcase exhaust system and method.

[0029] The core of the present application is to provide a large horsepower engine crankcase exhaust system.

[0030] Please refer to Figures 1 to 3 .

[0031] The large horsepower engine crankcase exhaust system comprises an exhaust pipeline 1, a heating assembly 2 and a temperature control module 3, the exhaust pipeline 1 is communicated between a crankcase exhaust port and an engine tail gas treatment system 5, the heating assembly 2 is arranged on the exhaust pipeline 1, the heating assembly is used for heating the exhaust pipeline 1, and the temperature control module 3 is used for controlling the heating assembly 2, so that tail gas in the exhaust pipeline 1 is kept at a specified temperature.

[0032] Specifically, the exhaust pipeline 1 is connected between the crankcase exhaust port and the engine tail gas treatment system 5, and the tail gas of the crankcase exhaust port is continuously guided to the engine tail gas treatment system 5, should be guided to the downstream of the exhaust control device in the post-processing or the engine tail gas treatment system 5, but should be upstream of the sampling probe in the engine tail gas treatment system 5, and full mixing with the engine tail gas exhaust is completed before sampling. In order to accelerate mixing and avoid boundary layer effect, the crankcase exhaust pipe should be inserted into the exhaust flow, and the direction of the crankcase exhaust pipe outlet is fixed relative to the direction of the exhaust. The temperature control module 3 controls the heating assembly 2, so that the tail gas in the exhaust pipeline 1 is kept at a specified temperature, and the dew point of the diesel engine crankcase tail gas is generally 40 DEG C. The heating assembly 2 needs to heat the temperature in the exhaust pipeline 1 to above the dew point, generally between 50-80 DEG C, and is matched with heat preservation to prevent condensate from being generated in the guiding process.

[0033] The large horsepower engine crankcase exhaust system described above guides the tail gas of the crankcase exhaust through the crankcase exhaust port to the engine tail gas treatment system 5 for tail gas treatment by means of the exhaust pipeline 1, ensures that the tail gas generated by the crankcase is not directly discharged into the surrounding environment, and ensures that the temperature of the exhaust pipeline 1 is kept above the dew point of the crankcase tail gas by means of the heating assembly 2 and the temperature control module 3, so as to avoid the generation of condensate during the test process.

[0034] The large horsepower engine crankcase exhaust system provided by the utility model will be introduced in more detail in combination with the drawings and specific embodiments.

[0035] In one specific embodiment, referring to Figures 1 to 3 The exhaust pipeline 1 comprises a first connecting section 11, a variable diameter section 12 and a second connecting section 13 connected in sequence, one end of the first connecting section 11 away from the variable diameter section 12 is communicated with the crankcase exhaust port, and one end of the second connecting section 13 away from the variable diameter section 12 is communicated with the engine tail gas treatment system 5.

[0036] Specifically, the variable diameter section 12 can effectively adjust the diameter of the pipeline according to the needs, so as to optimize the flow speed and pressure of the exhaust gas and improve the exhaust efficiency. It should be noted that the number of bends of the exhaust pipeline 1 should be as small as possible, the radius of the bends that must be installed should be as large as possible, the inner wall of the exhaust pipeline 1 should be smooth and conductive, should not react with the crankcase pollutants, and the length should be as short as possible.

[0037] On the basis of any one of the above embodiments, referring to Figures 1 to 3 , the reducing section 12 is a straight pipe section, and a flow meter 6 is arranged at the reducing section 12, and the flow meter 6 is used to detect the exhaust gas flow at the reducing section 12.

[0038] Specifically, the flow meter 6 is arranged at the reducing section 12, which can better detect the flow of the exhaust gas discharged from the crankcase vent.

[0039] On the basis of any one of the above embodiments, referring to Figures 1 to 3 , the connecting part of the first connecting section 11 and the crankcase vent is a high-temperature-resistant hose 7, which is a silica gel hose.

[0040] Specifically, the first connecting section 11 is connected to the crankcase vent, and the temperature of the crankcase is generally between 50-80℃. The high-temperature-resistant hose 7 can effectively keep the exhaust gas discharged from the crankcase warm to avoid the generation of condensed water.

[0041] On the basis of any one of the above embodiments, referring to Figures 1 to 3 , a heat preservation structure is arranged on the pipeline of the second connecting section 13, and the heat preservation structure is used to keep the exhaust gas in the second connecting section 13 warm.

[0042] Specifically, the same as the high-temperature-resistant hose 7, it is ensured that the temperature of the gas entering the engine exhaust gas treatment system 5 from the second connecting section 13 is higher than the dew point.

[0043] On the basis of any one of the above embodiments, referring to Figures 1 to 3 , the heat preservation structure includes an aluminum silicate pipe shell 4 arranged on the pipeline of the second connecting section 13.

[0044] Specifically, the aluminum silicate pipe shell 4 has good heat preservation performance, which can ensure that the temperature of the gas entering the engine exhaust gas treatment system 5 from the second connecting section 13 is higher than the dew point, and keep the temperature of the gas in the exhaust pipeline 1.

[0045] On the basis of any one of the above embodiments, referring to Figures 1 to 3 , the heating assembly 2 includes a heating belt 21 arranged around the exhaust pipeline 1, and the laying length of the heating belt 21 is set according to the laying length of the exhaust pipeline 1.

[0046] Specifically, the heating belt 21 is uniformly arranged around the exhaust pipeline 1, and the heating belt 21 can continuously and stably heat the whole exhaust pipeline 1, so as to ensure that the temperature in the exhaust pipeline 1 uniformly rises and remains stable, and further ensure that the exhaust gas in the exhaust pipeline 1 flows at a temperature above the dew point, thereby avoiding the generation of condensed water in the process.

[0047] On the basis of any one of the above embodiments, with reference to Figures 1 to 3 The temperature control module 3 comprises a temperature controller and a temperature sensor arranged on the exhaust pipe 1, and the temperature controller is electrically connected with the temperature sensor and the heating assembly 2.

[0048] Specifically, the temperature sensor continuously monitors the temperature of the exhaust gas in the exhaust pipe 1, and ensures that the temperature is always higher than the dew point of the exhaust gas. When the temperature sensor detects that the temperature in the exhaust pipe 1 gradually decreases and approaches the dew point of the exhaust gas, the heating assembly 2 is controlled by the temperature controller to heat the exhaust pipe 1, so as to ensure that the temperature of the exhaust gas in the exhaust pipe 1 is always higher than the dew point of the exhaust gas.

[0049] It should be noted in this embodiment that the exhaust pipe 1 is made of a sanitary stainless steel pipe.

[0050] The exhaust method of the large-horsepower engine crankcase exhaust system provided by the utility model is applied to the above-mentioned large-horsepower engine crankcase exhaust system, and the exhaust method comprises the following steps:

[0051] The exhaust pipe 1 is connected between the crankcase exhaust port and the engine exhaust treatment system 5, and the exhaust gas discharged from the crankcase exhaust port is conveyed into the exhaust treatment system 5 through the exhaust pipe 1;

[0052] The heating assembly 2 is used to heat the exhaust pipe 1, and the temperature control module 3 is used to control the heating assembly 2, so that the temperature of the exhaust pipe 1 is maintained at 50-80 DEG C.

[0053] Specifically, the method connects the exhaust pipe 1 between the crankcase exhaust port and the engine exhaust treatment system 5, introduces the exhaust gas discharged from the crankcase into the exhaust treatment system 5, and heats the exhaust pipe 1 by using the heating assembly 2, and the heating assembly 2 is accurately controlled by the temperature control module 3, so that the temperature of the exhaust pipe 1 is maintained in the range of 50-80 DEG C, so as to ensure that the temperature of the exhaust gas in the exhaust pipe 1 is always higher than the dew point of the exhaust gas.

[0054] The large-horsepower engine crankcase exhaust method adopts the exhaust pipe 1 to convey the exhaust gas discharged from the crankcase to the engine exhaust treatment system 5 through the crankcase exhaust port for exhaust treatment, so as to ensure that the exhaust gas generated by the crankcase is not directly discharged into the surrounding environment, and the temperature of the exhaust pipe 1 is maintained above the dew point of the crankcase exhaust gas by using the heating assembly 2 and the temperature control module 3, so as to avoid the generation of condensed water in the test process.

[0055] The embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments, and the same or similar parts of each embodiment can be referred to each other.

[0056] The above has carried out the detailed introduction to the large horsepower engine crankcase exhaust system and method provided by the utility model. The principle and implementation mode of the utility model are described by applying specific examples in this paper, and the above embodiment description is only used for helping to understand the method and core idea of the utility model. It should be pointed out that for ordinary skilled person in the art, without departing from the principle of the utility model, the utility model can be improved and modified in several ways, and these improvements and modifications also fall within the protection scope of the utility model.

Claims

1. A heavy duty engine crankcase ventilation system characterized by, The application relates to an exhaust pipe (1) connected between a crankcase vent and an engine exhaust treatment system (5), a heating assembly (2) arranged on the exhaust pipe (1) and used for heating the exhaust pipe (1), and a temperature control module (3) used for controlling the heating assembly (2) to keep exhaust gas in the exhaust pipe (1) at a specified temperature. The exhaust pipe (1) comprises a first connecting section (11), a variable-diameter section (12) and a second connecting section (13) connected in sequence, one end of the first connecting section (11) away from the variable-diameter section (12) is connected with the crankcase vent, and one end of the second connecting section (13) away from the variable-diameter section (12) is connected with the engine exhaust treatment system (5). The variable-diameter section (12) is a straight pipe section, a flowmeter (6) is arranged at the variable-diameter section (12), and the flowmeter (6) is used for detecting the exhaust gas flow at the variable-diameter section (12). The first connecting section (11) is connected with the crankcase vent through a high-temperature-resistant hose (7), and the high-temperature-resistant hose is a silica gel hose.

2. A heavy duty engine crankcase ventilation system as set forth in claim 1 wherein, A heat preservation structure is arranged on the pipe of the second connecting section (13), and the heat preservation structure is used for heat preserving exhaust gas in the second connecting section (13).

3. A heavy duty engine crankcase ventilation system as set forth in claim 2 wherein, The heat preservation structure comprises an aluminum silicate pipe shell (4) sleeved on the pipe of the second connecting section (13).

4. A heavy duty engine crankcase ventilation system as set forth in claim 2 wherein, The heating assembly (2) comprises a heating belt (21) arranged around the exhaust pipe (1), and the laying length of the heating belt (21) is arranged according to the laying length of the exhaust pipe (1).

5. A heavy duty engine crankcase ventilation system as set forth in claim 2 wherein, The temperature control module (3) comprises a temperature controller and a temperature sensor arranged on the exhaust pipe (1), and the temperature controller is electrically connected with the temperature sensor and the heating assembly (2) respectively.

6. A heavy duty engine crankcase ventilation system as set forth in claim 5 wherein, The exhaust pipe (1) is made of a sanitary-grade stainless steel pipe.

7. A heavy duty engine crankcase ventilation system as set forth in claim 1 wherein, ​ 8. A heavy duty engine crankcase ventilation system as in claim 1 wherein, ​ 9. A heavy duty engine crankcase ventilation system according to any of claims 1-8, characterized in that, ​

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