Internal combustion locomotive cooling system based on two-stage supercharging and EGR cooler

Abstract

The utility model relates to the technical field of internal combustion locomotive cooling systems based on two-stage supercharging and EGR coolers, in particular to an internal combustion locomotive cooling system based on two-stage supercharging and EGR coolers, which comprises a diesel engine, a high-temperature cooling system and a low-temperature cooling system, and the high-temperature cooling system and the low-temperature cooling system are arranged in the internal combustion locomotive. According to the design, high-temperature water which cools the cylinder cover is completely introduced into the EGR cooler through the cooling pipeline so as to cool high-temperature waste gas in the EGR cooler. Meanwhile, a composite intercooling system is adopted, high-temperature water which cools the EGR cooler is used for cooling high-low intercoolers to reduce the flow of the intercoolers cooled by a low-temperature water system, so that the number of low-temperature heat dissipation single sections of the locomotive is reduced, and a cooling water system of the diesel locomotive is optimized. Through reasonable diesel engine thermal load distribution, high-temperature and low-temperature circulating system cooling water cavities of high-pressure and low-pressure intercoolers are designed, the flow of cooling water pumps of high-temperature and low-temperature cooling systems of the diesel engine is allocated, the auxiliary power consumption of the cooling systems is reduced, and the thermal efficiency of the diesel engine is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of an internal combustion locomotive cooling system based on two-stage supercharging and an EGR cooler, in particular to an internal combustion locomotive cooling system based on two-stage supercharging and an EGR cooler. Background Art

[0002] When a diesel engine adopts a two-stage supercharging and an EGR system, the full-load performance of the diesel engine can be effectively improved, especially the power performance and fuel economy under low-speed conditions and partial-load conditions. By introducing a small amount of exhaust gas after combustion into the EGR cooler, the temperature in the combustion chamber is reduced, and the content of nitrogen oxides in the exhaust gas is reduced, thereby improving the emission level of the diesel engine. However, since the temperature of the exhaust gas discharged from the cylinder is very high, a cooler needs to be connected to the EGR pipeline and coolant is introduced to reduce the exhaust gas temperature. The technology of the present invention is produced during the research and development of the diesel engine. It is necessary to reasonably distribute the heat load of the diesel engine to solve the cooling problem of the high-temperature exhaust gas in the EGR cooler, and at the same time, the cooling water pump of the prototype can be borrowed and the design of the high- and low-temperature heat dissipation units of the locomotive can be optimized to achieve the purpose of reducing the design and development cost. Content of the Utility Model

[0003] In order to overcome the existing deficiencies, the utility model provides an internal combustion locomotive cooling system based on two-stage supercharging and an EGR cooler.

[0004] The technical solution adopted by the utility model to solve its technical problems is: an internal combustion locomotive cooling system based on two-stage supercharging and an EGR cooler, including a diesel engine and a high-temperature cooling system and a low-temperature cooling system arranged inside the internal combustion locomotive; a front-end integrated box body, a high-pressure intercooler and a low-pressure intercooler are arranged inside the diesel engine; the high-temperature cooling system includes a high-temperature water pump, an EGR cooler, a high-temperature cooling pipeline and a high-temperature heat dissipation unit. Among them, the water flow is pressurized by the high-temperature water pump and then flows into the cylinder head water inlet pipe of the diesel engine from the front-end integrated box body, cools the left and right cylinder liners and cylinder heads, and then is all introduced into the EGR cooler through the cylinder head water outlet main pipe. After re-entering the front-end integrated box body, it enters the high-pressure intercooler and the low-pressure intercooler inside the diesel engine and the high-pressure supercharger and the low-pressure supercharger arranged on one side of the high-pressure intercooler and the low-pressure intercooler through pipelines respectively. The high-temperature cooling water is collected and then enters the high-temperature heat dissipation unit of the locomotive for heat dissipation, and then is sent to the high-temperature water pump to continue circulating; the low-temperature cooling system includes a low-temperature water pump, an oil heat exchanger, a low-temperature cooling pipeline and a low-temperature heat dissipation unit. Among them, the water flow is pressurized by the low-temperature water pump and then flows into the high-pressure intercooler and the low-pressure intercooler inside the diesel engine from the front-end integrated box body. The low-temperature cooling water is collected and then enters the oil heat exchanger, and then enters the low-temperature heat dissipation unit of the locomotive for heat dissipation, and finally is sent to the low-temperature water pump to continue circulating.

[0005] According to another embodiment of the present utility model, it further includes that the front-end integrated box body is provided with three groups of water outlet pipes and three groups of water inlet pipes. The three groups of water outlet pipes are respectively the water outlet pipe one, the water outlet pipe two, and the water outlet pipe three; the three groups of water inlet pipes are respectively the water inlet pipe one, the water inlet pipe two, and the water inlet pipe three.

[0006] According to another embodiment of the present utility model, it further includes that the water outlet pipe one is divided into two cavities in the front-end integrated box body and is respectively connected to a group of cylinder head water inlet pipes. Each group of the cylinder head water inlet pipes is connected to each cylinder of the diesel engine. Each cylinder of the diesel engine is communicated with the cylinder head water outlet collecting pipe, and is communicated with the EGR cooler through the cylinder head water outlet collecting pipe, and then is introduced into the front-end integrated box body through the water inlet pipe one.

[0007] According to another embodiment of the present utility model, it further includes that the water outlet pipe two is divided into four groups of branch pipes at the end and is respectively connected to two groups of low-pressure intercoolers and two groups of high-pressure intercoolers, and then is introduced into the oil exchanger, the locomotive low-temperature radiator single unit, and the low-temperature water pump, and is connected to the front-end integrated box body through the water inlet pipe two.

[0008] According to another embodiment of the present utility model, it further includes that the water outlet pipe three is divided into seven groups of branch pipes at the end and is respectively connected to two groups of low-pressure intercoolers, two groups of high-pressure intercoolers, one group of high-pressure supercharger, and two groups of low-pressure superchargers, and then is introduced into the locomotive high-temperature radiator single section and the high-temperature water pump, and is connected to the front-end integrated box body through the water inlet pipe three.

[0009] According to another embodiment of the present utility model, it further includes that throttle orifice plates are added to the pipelines flowing into the high-pressure intercooler for cooling.

[0010] The beneficial effects of the present utility model are as follows: the high-temperature water after cooling the cylinder head is all introduced into the EGR cooler through the cooling pipeline to cool the high-temperature exhaust gas in the EGR cooler. At the same time, a composite intercooling system is adopted. First, the high-temperature water after cooling the EGR cooler is used to cool the high- and low-pressure intercoolers to reduce the flow rate of the low-temperature water system for cooling the intercoolers, so as to reduce the number of locomotive low-temperature radiator single units and optimize the cooling water system of the diesel locomotive. Since the resistance of the high-pressure intercooler is much smaller than that of the low-pressure intercooler, throttle orifice plates need to be added to the high-pressure intercooler part in both cooling circulation systems to achieve the flow rate matching of the high- and low-pressure intercoolers. Through reasonable distribution of the diesel engine heat load, the high- and low-temperature circulation system cooling water cavities of the high- and low-pressure intercoolers are designed, and the flow rates of the cooling water pumps of the high- and low-temperature cooling systems of the diesel engine are adjusted, so as to reduce the auxiliary power consumption of the cooling system and improve the thermal efficiency of the diesel engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The present utility model will be further described below with reference to the drawings and embodiments.

[0012] Figure 1 It is a structural schematic diagram of the present utility model.

[0013] In the figure: 1. Diesel engine; 2. High-temperature cooling system; 3. Low-temperature cooling system. Specific implementation mode

[0014] As Figure 1 Shown in the figure is an internal combustion locomotive cooling system based on two-stage supercharging and an EGR cooler, which includes a diesel engine 1, a high-temperature cooling system 2 and a low-temperature cooling system 3 arranged inside the internal combustion locomotive; a front-end integrated box body, a high-pressure intercooler and a low-pressure intercooler are arranged in the diesel engine 1; the high-temperature cooling system 2 includes a high-temperature water pump, an EGR cooler, high-temperature cooling pipelines and a high-temperature heat dissipation single section. Among them, after the water flow is pressurized by the high-temperature water pump, it flows into the cylinder head water inlet pipe of the diesel engine 1 from the front-end integrated box body, cools the cylinder liners and cylinder heads on the left and right sides, and then is all introduced into the EGR cooler through the cylinder head water outlet main pipe. After flowing into the front-end integrated box body again, it enters the high-pressure intercooler and low-pressure intercooler in the diesel engine 1 and the high-pressure supercharger and low-pressure supercharger arranged on one side of the high-pressure intercooler and low-pressure intercooler through pipelines respectively. The high-temperature cooling water is aggregated and then enters the locomotive high-temperature heat dissipation single section for heat dissipation, and then is sent to the high-temperature water pump to continue circulating; the low-temperature cooling system 3 includes a low-temperature water pump, an oil heat exchanger, low-temperature cooling pipelines and a low-temperature heat dissipation single section. Among them, after the water flow is pressurized by the low-temperature water pump, it flows into the high-pressure intercooler and low-pressure intercooler in the diesel engine 1 from the front-end integrated box body. The low-temperature cooling water is aggregated and then enters the oil heat exchanger, and then enters the locomotive low-temperature heat dissipation single section for heat dissipation, and finally is sent to the low-temperature water pump to continue circulating.

[0015] According to another embodiment of the present invention, it further includes that the front-end integrated box body is provided with three groups of water outlet pipes and three groups of water inlet pipes. The three groups of water outlet pipes are respectively a water outlet pipe one, a water outlet pipe two and a water outlet pipe three; the three groups of water inlet pipes are respectively a water inlet pipe one, a water inlet pipe two and a water inlet pipe three.

[0016] According to another embodiment of the present invention, it further includes that the water outlet pipe one is divided into two cavities inside the front-end integrated box body, and is respectively connected to a group of cylinder head water inlet pipes. Each group of cylinder head water inlet pipes is connected to each cylinder of the diesel engine. Each cylinder of the diesel engine is communicated with the cylinder head water outlet collecting pipe, and is communicated with the EGR cooler by the cylinder head water outlet collecting pipe, and then is introduced into the front-end integrated box body through the water inlet pipe one.

[0017] According to another embodiment of the present invention, it further includes that the water outlet pipe two is divided into four groups of branch pipes at the end, and is respectively connected to two groups of low-pressure intercoolers and two groups of high-pressure intercoolers, and is aggregated into the oil exchanger, the locomotive low-temperature heat dissipation single unit and the low-temperature water pump, and is connected to the front-end integrated box body through the water inlet pipe two.

[0018] According to another embodiment of the present utility model, it further includes components that are respectively connected to two groups of low-pressure intercoolers, two groups of high-pressure intercoolers, one group of high-pressure superchargers, and two groups of low-pressure superchargers, and converge into the locomotive high-temperature heat dissipation single section and the high-temperature water pump, and are connected to the front-end integrated box through the third water inlet pipe.

[0019] According to another embodiment of the present utility model, it further includes that throttle orifice plates are added to the pipelines flowing into the high-pressure intercooler for cooling.

[0020] Specifically, since the resistance of the high-pressure intercooler is much smaller than that of the low-pressure intercooler, throttle orifice plates need to be added to both parts of the high-pressure intercooler in the two cooling circulation systems to achieve the flow matching between the high-pressure intercooler and the low-pressure intercooler.

[0021] In the specific operation process, change the structure of the high-temperature water circulation system of the diesel engine 1. All the high-temperature water after being aggregated at the cylinder head is introduced into the EGR cooler and then enters the high-pressure intercooler, low-pressure intercooler, high-level supercharger, and low-pressure supercharger; the high-pressure intercooler and low-pressure intercooler of the diesel engine 1 are composed of two cooling pipelines of low-temperature water and high-temperature water. Throttle orifice plates are added to the cooling pipelines of the high-pressure stage intercooler with relatively small resistance to adjust the flow distribution of the cooling water in the high- and low-pressure stage intercoolers, reduce the flow of low-temperature water entering the intercooler, and make the sum of the heat carried away by the low-temperature water and the heat carried away by the newly added high-temperature water consistent with the heat carried away by the original single low-temperature cooling, so as to realize the circulation of the high-temperature cooling system 2 and the low-temperature cooling system 3.

[0022] The above description is illustrative rather than restrictive to the present utility model. Those of ordinary skill in the art understand that many modifications, variations, or equivalents can be made without departing from the spirit and scope defined by the appended claims, and all of them will fall within the protection scope of the present utility model.

Claims

1. A cooling system for a diesel locomotive based on a two-stage supercharging and an EGR cooler, characterized in that: It comprises a diesel engine (1) and a high-temperature cooling system (2) and a low-temperature cooling system (3) arranged inside an internal combustion locomotive; the diesel engine (1) is provided with a front end integrated box, a high-pressure intercooler and a low-pressure intercooler; The high-temperature cooling system (2) comprises a high-temperature water pump, an EGR cooler, a high-temperature cooling pipeline and a high-temperature heat dissipation unit, wherein the water flow increases the pressure through the high-temperature water pump and then flows into the cylinder head water inlet pipe of the diesel engine (1) from the front integrated box, cools the cylinder liners and cylinder heads on the left and right sides, and then is introduced into the EGR cooler through the cylinder head water outlet main pipe, and then flows into the front integrated box again and then enters the high-pressure intercooler and the low-pressure intercooler in the diesel engine (1) and the high-pressure supercharger and the low-pressure supercharger arranged on one side of the high-pressure intercooler and the low-pressure intercooler through pipelines, and the high-temperature cooling water is collected and then enters the high-temperature heat dissipation unit of the locomotive for heat dissipation, and then is sent to the high-temperature water pump for continuous circulation; The low-temperature cooling system (3) comprises a low-temperature water pump, an oil heat exchanger, a low-temperature cooling pipeline and a low-temperature heat dissipation unit, wherein the water flow increases the pressure through the low-temperature water pump and then flows from the front integrated box into the high-pressure intercooler and the low-pressure intercooler in the diesel engine (1), the low-temperature cooling water is collected and enters the oil heat exchanger, then enters the locomotive low-temperature heat dissipation unit for heat dissipation, and finally is sent to the low-temperature water pump for continued circulation.

2. The internal combustion locomotive cooling system based on two-stage supercharging and EGR cooler according to claim 1 is characterized in that: The front-end integrated box is provided with three groups of water outlet pipes and three groups of water inlet pipes, the three groups of water outlet pipes are respectively water outlet pipe 1, water outlet pipe 2 and water outlet pipe 3; the three groups of water inlet pipes are respectively water inlet pipe 1, water inlet pipe 2 and water inlet pipe 3.

3. The internal combustion locomotive cooling system based on two-stage supercharging and EGR cooler according to claim 2 is characterized in that: The water outlet pipe 1 is divided into two cavities in the front integrated box, which are respectively connected to a group of cylinder head water inlet pipes. Each group of cylinder head water inlet pipes is connected to each cylinder of the diesel engine. Each cylinder of the diesel engine is connected to the cylinder head water outlet manifold, which is connected to the EGR cooler and then merged into the front integrated box through the water inlet pipe 1.

4. The internal combustion locomotive cooling system based on two-stage supercharging and EGR cooler according to claim 2 is characterized in that: The water outlet pipe 2 is divided into four groups of branches at the end, which are respectively connected to two groups of low-pressure intercoolers and two groups of high-pressure intercoolers, and merge into the oil exchanger, the locomotive low-temperature heat dissipation unit, and the low-temperature water pump, and are connected to the front integrated box through the water inlet pipe 2.

5. The internal combustion locomotive cooling system based on two-stage supercharging and EGR cooler according to claim 2 is characterized in that: The three ends of the water outlet pipe are divided into seven groups of branch pipes, which are respectively connected to two groups of low-pressure intercoolers, two groups of high-pressure intercoolers, one group of high-pressure superchargers and two groups of low-pressure superchargers, and merge into the locomotive high-temperature heat dissipation unit and high-temperature water pump, and are connected to the front integrated box through the water inlet pipe.

6. The internal combustion locomotive cooling system based on two-stage supercharging and EGR cooler according to claim 1 is characterized in that: A throttling orifice plate is added to the pipelines flowing into the high-pressure intercooler for cooling.

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