阅读说明：本技术 一种新型柴油机冷却系统 (Novel diesel engine cooling system ) 是由 赵宏霞 任小龙 于 2020-12-04 设计创作，主要内容包括：本发明涉及汽车发动机技术领域,特别涉及一种新型柴油机冷却系统；其一种新型柴油机冷却系统,包括相连通的缸体水套和缸盖水套,所述缸盖水套上并联有第一冷却循环管路、第二冷却循环管路、散热管路,所述第一冷却循环管路、第二冷却循环管路以及散热管路的另一端均通过水泵连接在缸体水套上。本发明提供一种新的新型柴油机冷却系统,该新型柴油机冷却系统采用分流式水套：缸体和缸盖有各自的冷却回路,保证了缸体水套与缸盖水套的流动分布均匀,避免出现缸体或缸盖出现局部过热和过冷。(The invention relates to the technical field of automobile engines, in particular to a novel diesel engine cooling system; the novel diesel engine cooling system comprises a cylinder body water jacket and a cylinder cover water jacket which are communicated, wherein a first cooling circulation pipeline, a second cooling circulation pipeline and a heat dissipation pipeline are connected on the cylinder cover water jacket in parallel, and the other ends of the first cooling circulation pipeline, the second cooling circulation pipeline and the heat dissipation pipeline are connected on the cylinder body water jacket through water pumps. The invention provides a novel diesel engine cooling system, which adopts a split-flow water jacket: the cylinder body and the cylinder cover are provided with respective cooling loops, so that the uniform flow distribution of the cylinder body water jacket and the cylinder cover water jacket is ensured, and the local overheating and supercooling of the cylinder body or the cylinder cover are avoided.)

1. The utility model provides a novel diesel engine cooling system, its characterized in that, including cylinder body water jacket (1) and cylinder cap water jacket (2) that are linked together, parallelly connected has first cooling cycle pipeline, second cooling cycle pipeline, heat dissipation pipeline on cylinder cap water jacket (2), the other end of first cooling cycle pipeline, second cooling cycle pipeline and heat dissipation pipeline all connects on cylinder body water jacket (1) through water pump (6).

2. The novel diesel engine cooling system according to claim 1, characterized in that the first cooling circulation pipeline comprises a fan heater (3), an EGR cooler (4) and an SCR cooler (5), the fan heater (3) is connected with the cylinder cover water jacket (2) through a pipeline, a water inlet of the EGR cooler (4) is connected with the fan heater (3), a water outlet of the EGR cooler is connected with a water pump (6) through a pipeline, and the SCR cooler (5) is connected with the fan heater (3) and the EGR cooler (4) in parallel.

3. The novel diesel engine cooling system of claim 2, characterized in that the second cooling circulation pipeline comprises an air compressor (7) and an oil cooler (8) which are connected in parallel, the water inlets of the air compressor (7) and the oil cooler (8) are connected with the cylinder cover water jacket (2), and the water outlet is connected with the water pump (6).

4. The novel diesel engine cooling system of claim 3, characterized in that the cooling system further comprises a bypass pipeline (10), wherein a water inlet of the bypass pipeline (10) is connected with the cylinder head water jacket (2) through a thermostat (9), and a water outlet is connected with a water pump (6).

5. The novel diesel engine cooling system of claim 4, characterized in that the heat dissipation pipeline comprises a radiator (11) and a throttle valve (12), one end of the throttle valve (12) is connected with the thermostat (9), the other end of the throttle valve is connected with a water inlet of the radiator (11), and a water outlet of the radiator (11) is connected with the water pump (6);

preferably, the first cooling circulation line and the second cooling circulation line each include a flow rate adjustment device.

6. The novel diesel engine cooling system according to claim 5, characterized in that when the system water temperature is lower than the opening temperature of the thermostat (9), the first cooling circulation pipeline, the second cooling circulation pipeline and the bypass pipeline (10) are opened, the cooling liquid is divided into three paths after flowing through the cylinder body water jacket (1) and the cylinder cover water jacket (2), one path returns to the water pump (6) after passing through the first cooling circulation pipeline in which the EGR cooler (4) and the warm air are connected in series and are connected in parallel with the SCR cooler (5), the other path returns to the water pump (6) after passing through the second cooling circulation pipeline in which the engine oil cooler (8) and the air compressor (7) are connected in parallel, and the last path of cooling liquid directly returns to the water pump (6) through the bypass pipeline (10) and then continues to circulate through the bypass pipeline (10).

7. The novel diesel engine cooling system according to claim 5, characterized in that when the system water temperature is higher than the opening temperature of the thermostat (9) and lower than the full opening temperature of the thermostat (9), the heat dissipation pipeline is opened, the bypass pipeline (10) and the thermostat (9) are opened at the same time, the cooling liquid is divided into three paths after flowing through the cylinder water jacket (1) and the cylinder head water jacket (2), the water pump (6) conveys one path of the cooling liquid from the radiator (11) to the cylinder water jacket (1) and the cylinder head water jacket (2), the cooling liquid heated by the transmitter water jacket returns to the radiator (11) again for cooling, the cooling liquid circulates sequentially, and the other path of the cooling liquid returns to the water pump (6) directly through the bypass pipeline (10) and continues to circulate through the bypass pipeline (10).

8. The novel diesel engine cooling system according to claim 5, characterized in that when the system water temperature is higher than the full open temperature of the thermostat (9), the heat dissipation pipeline is opened, the bypass pipeline (10) is closed, the thermostat (9) is opened, the water pump (6) conveys the coolant from the radiator (11) to the cylinder body water jacket (1) and the cylinder head water jacket (2), and the coolant heated by the transmitter water jacket returns to the radiator (11) again for cooling and circulates in sequence.

9. The novel diesel engine cooling system of claim 1, characterized in that the cooling system further comprises a degassing pipeline connected to the cylinder head water jacket (2), the degassing pipeline is used for discharging redundant steam to the atmosphere and simultaneously supplementing water to the water pump.

10. The novel diesel engine cooling system of claim 9, characterized in that the degassing pipeline comprises an expansion tank (13), one end of the expansion tank (13) is connected with the cylinder cover water jacket (2), and the other end is connected with a water pump (6).

Technical Field

The invention relates to the technical field of automobile engines, in particular to a novel diesel engine cooling system.

Background

With the rapid development of modern automobile technology, people not only pay attention to the good dynamic property of the automobile, but also have higher requirements on the economy and the comfort of the automobile.

The cooling system is an important component of the engine, and the well-designed cooling system can ensure that the power device and related components can operate under ideal conditions, such as no overheating, quick warm-up, constant temperature maintenance or strict temperature change range and the like in all operating states, so that the service life of the engine is prolonged, the maintenance cost, the emission and the oil consumption are reduced, and the economical efficiency and the comfort of an automobile are improved.

The cooling system of the existing diesel engine adopts the traditional arrangement and connection mode: the integrated water jacket is adopted, so that the flowing distribution of the cooling liquid of the water jacket of the cylinder body and the cylinder cover is uneven, and the local overheating or overcooling of the cylinder body or the cylinder cover occurs.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides a novel cooling system of a diesel engine.

The specific technical scheme of the invention is as follows:

the invention provides a novel diesel engine cooling system which comprises a cylinder body water jacket and a cylinder cover water jacket which are communicated, wherein a first cooling circulation pipeline, a second cooling circulation pipeline and a heat dissipation pipeline are connected on the cylinder cover water jacket in parallel, and the other ends of the first cooling circulation pipeline, the second cooling circulation pipeline and the heat dissipation pipeline are connected to the cylinder body water jacket through water pumps.

Further improve, first cooling cycle pipeline includes air heater, EGR cooler and SCR cooler, the air heater with the cylinder cap water jacket passes through the tube coupling, the water inlet of EGR cooler with the air heater is connected, and the delivery port passes through the tube coupling water pump, the parallelly connected with of SCR cooler air heater, EGR cooler are parallelly connected.

The second cooling circulation pipeline comprises an air compressor and an engine oil cooler which are connected in parallel, water inlets of the air compressor and the engine oil cooler are connected with the cylinder cover water jacket, and a water outlet of the air compressor and the engine oil cooler is connected with the water pump.

The cooling system further comprises a bypass pipeline, a water inlet of the bypass pipeline is connected with the cylinder cover water jacket through a thermostat, and a water outlet of the bypass pipeline is connected with a water pump.

The improved structure is characterized in that the heat dissipation pipeline comprises a radiator and a throttle valve, one end of the throttle valve is connected with the thermostat, the other end of the throttle valve is connected with a water inlet of the radiator, and a water outlet of the radiator is connected with a water pump;

preferably, the first cooling circulation line and the second cooling circulation line each include a flow rate adjustment device.

The engine oil cooler is further improved, when the water temperature of the system is lower than the starting temperature of the thermostat, the first cooling circulation pipeline, the second cooling circulation pipeline and the bypass pipeline are opened, the cooling liquid flows through the cylinder body water jacket and the cylinder cover water jacket and then is divided into three paths, one path of the cooling liquid returns to the water pump through the first cooling circulation pipeline which is formed by connecting the EGR cooler and the warm air in series and is connected with the SCR cooler in parallel, the other path of the cooling liquid returns to the water pump through the second cooling circulation pipeline which is formed by connecting the engine oil cooler and the air compressor in parallel, and finally the cooling liquid directly returns to the water pump through the bypass pipeline and.

The improvement is further that when the water temperature of the system is higher than the opening temperature of the thermostat and lower than the full opening temperature of the thermostat, the radiating pipeline is opened, the bypass pipeline and the thermostat are opened simultaneously, the cooling liquid flows through the cylinder body water jacket and the cylinder cover water jacket and then is divided into three paths, the water pump conveys one path of cooling liquid from the radiator to the cylinder body water jacket and the cylinder cover water jacket, the cooling liquid heated by the sender water jacket returns to the radiator again for cooling and circulates sequentially, and the other path of cooling liquid directly returns to the water pump through the bypass pipeline and then continues to circulate through the bypass pipeline.

The improvement is further that when the water temperature of the system is higher than the full-open temperature of the thermostat, the radiating pipeline is opened, the bypass pipeline is closed, the thermostat is opened, the water pump conveys the cooling liquid from the radiator to the cylinder body water jacket and the cylinder cover water jacket, the cooling liquid heated by the water jacket of the transmitter returns to the radiator again for cooling, and the cooling liquid circulates sequentially.

In a further improvement, the cooling system further comprises a degassing pipeline connected to the cylinder cover water jacket, and the degassing pipeline is used for discharging redundant steam to the atmosphere and supplementing water to the water pump.

The degassing pipeline comprises an expansion water tank, one end of the expansion water tank is connected with the cylinder cover water jacket, and the other end of the expansion water tank is connected with the water pump.

The invention has the following beneficial effects:

the invention provides a novel diesel engine cooling system, which adopts a split-flow water jacket: the cylinder body and the cylinder cover are provided with respective cooling loops, so that the uniform flow distribution of the cylinder body water jacket and the cylinder cover water jacket is ensured, and the local overheating and supercooling of the cylinder body or the cylinder cover are avoided.

Drawings

Fig. 1 is a block diagram of a cooling system of a novel diesel engine according to the present invention.

Detailed Description

The present invention will be described in further detail with reference to the following examples and drawings.

The invention provides a novel diesel engine cooling system, which comprises a cylinder body water jacket 1 and a cylinder cover water jacket 2 which are communicated with each other, wherein the cylinder cover water jacket 2 is connected with a first cooling circulation pipeline, a second cooling circulation pipeline and a heat dissipation pipeline in parallel, and the other ends of the first cooling circulation pipeline, the second cooling circulation pipeline and the heat dissipation pipeline are connected to the cylinder body water jacket 1 through a water pump 6.

The invention provides a novel diesel engine cooling system, which adopts a split-flow water jacket: the cylinder body and the cylinder cover are provided with respective cooling loops, so that the uniform flow distribution of the cylinder body water jacket and the cylinder cover water jacket is ensured, and the local overheating and supercooling of the cylinder body or the cylinder cover are avoided.

The temperature difference between the cylinder body and the cylinder cover is large, and the ideal temperature distribution of the engine is as follows: the working temperature of the cylinder cover is low, the inflation efficiency is improved (compared with the traditional water jacket), the harmful substance emission is favorably reduced, and the output power is improved; the cylinder body has high working temperature, which is beneficial to reducing friction work, reducing oil consumption and reducing the emission of harmful substances under partial load.

In this embodiment first cooling cycle pipeline includes air heater 3, EGR cooler 4 and SCR cooler 5, air heater 3 with cylinder cap water jacket 2 passes through the tube coupling, EGR cooler 4's water inlet with air heater 3 is connected, and the delivery port passes through tube coupling water pump 6, SCR cooler 5 parallelly connected with air heater 3, EGR cooler 4 are parallelly connected. The cooling liquid with high temperature at the inlet of the air heater in the embodiment has beneficial heat dissipation characteristic to the warm air, the warm air and the EGR cooler are arranged in series, the flow of the water pump is reduced, the power consumption of the water pump is reduced, and the fuel economy of the engine is improved

In this embodiment, the second cooling circulation pipeline includes an air compressor 7 and an engine oil cooler 8 which are connected in parallel, water inlets of the air compressor 7 and the engine oil cooler 8 are connected with the cylinder cover water jacket 2, and a water outlet is connected with the water pump 6.

In the embodiment, the engine oil cooler is connected with the air compressor, the warm air cooler and the EGR cooler in parallel, so that the system resistance can be reduced, and the pump lift of the water pump is further reduced; the flow demand of the cooling system can be adjusted by checking the flow of the oil cooler; when the heat dissipation pipeline is opened, more cooling liquid passes through the radiator, the cooling performance of the system is improved, and the engine oil temperature is ensured to be in the optimal state

The cooling system in the embodiment further comprises a bypass pipeline 10, a water inlet of the bypass pipeline 10 is connected with the cylinder cover water jacket 2 through a thermostat 9, and a water outlet of the bypass pipeline is connected with the water pump 6. The thermostat in this embodiment is arranged before the engine is flooded. When the engine is cold, the engine runs stably, and the temperature fluctuation of the cooling liquid can be reduced. And the water inlet temperature saving can also shorten the engine warming-up time.

In this embodiment, the heat dissipation pipeline includes a radiator 11 and a throttle valve 12, one end of the throttle valve 12 is connected with the thermostat 9, the other end of the throttle valve is connected with a water inlet of the radiator 11, and a water outlet of the radiator 11 is connected with the water pump 6;

preferably, the first cooling circulation line and the second cooling circulation line each include a flow rate adjustment device. In the present embodiment, the first cooling circulation line, the second cooling circulation line, and the heat dissipation line may be provided with a flow rate adjustment device such as a throttle valve (preferably, an electromagnetic throttle valve) for adjusting the flow rate as needed.

The water inlet with warm braw and EGR cooler is connected behind the temperature saver and parallelly connected with the radiator water route in this embodiment, can reduce system resistance.

The water pump is arranged on the air inlet side of the cylinder body and is driven by the balance shaft. The water pump and the thermostat are modularized and integrated, and peripheral pipelines are reduced.

In the embodiment, when the water temperature of the system (the water temperature of the system is the temperature of water in a diesel engine, namely a transmitter) is lower than the opening temperature of the thermostat 9, the first cooling circulation pipeline, the second cooling circulation pipeline and the bypass pipeline 10 are opened, the cooling liquid flows through the cylinder body water jacket 1 and the cylinder cover water jacket 2 and then is divided into three paths, one path of the cooling liquid returns to the water pump 6 through the first cooling circulation pipeline in which the EGR cooler 4 and the warm air are connected in series and the SCR cooler 5 is connected in parallel, the other path of the cooling liquid returns to the water pump 6 through the second cooling circulation pipeline in which the engine oil cooler 8 and the air compressor 7 are connected in parallel, and the last path of the cooling liquid directly returns to the water pump 6.

In the embodiment, when the water temperature of the system is higher than the opening temperature of the thermostat 9 and lower than the full opening temperature of the thermostat 9, the heat dissipation pipeline is opened, the bypass pipeline 10 and the thermostat 9 are opened simultaneously, the coolant flows through the cylinder body water jacket 1 and the cylinder cover water jacket 2 and then is divided into three paths, the water pump 6 conveys one path of coolant from the radiator 11 to the cylinder body water jacket 1 and the cylinder cover water jacket 2, the coolant heated by the transmitter water jacket returns to the radiator 11 again for cooling and circulates sequentially, and the other path of coolant directly returns to the water pump 6 through the bypass pipeline 10 and then continues to circulate through the bypass pipeline 10.

In this embodiment, when the water temperature of the system is higher than the full-open temperature of the thermostat 9, the heat dissipation pipeline is opened, the bypass pipeline 10 is closed, the thermostat 9 is opened, the water pump 6 conveys the coolant from the radiator 11 to the cylinder body water jacket 1 and the cylinder head water jacket 2, and the coolant heated by the sender water jacket returns to the radiator 11 again for cooling and circulates sequentially.

The cooling system in the embodiment further comprises a degassing pipeline connected to the cylinder cover water jacket 2, wherein the degassing pipeline is used for discharging redundant steam to the atmosphere and supplementing water to the water pump.

In this embodiment, the degassing pipeline includes an expansion tank 13, and one end of the expansion tank 13 is connected with the cylinder head water jacket 2, and the other end is connected with the water pump 6.

The circulation mode of the novel diesel engine cooling system mainly comprises three modes:

and (3) small circulation: when the circulating cooling liquid is lower than a certain temperature, the thermostat is closed, and the cooling liquid does not flow through the radiator, so that the engine reaches the optimal working temperature as soon as possible. At the moment, the coolant flows through the cylinder body water jacket and the cylinder cover water jacket and then water is discharged and divided into three paths, the first branch returns to the water pump through a water path in which EGR coolant and warm air are connected in series and are connected with the SCR cooler in parallel, the second branch returns to the water pump through a water path in which the engine oil cooler and the air compressor are connected in parallel, and the coolant of the third branch directly flows through the bypass branch and directly returns to the water pump and then continues to circulate.

And (3) large circulation: when the circulating cooling liquid rises to a certain temperature, the thermostat is opened, the water pump conveys the cooling liquid from the radiator to the cylinder body water jacket and the cylinder cover water jacket, the cooling liquid heated by the engine water jacket returns to the radiator for cooling, and the circulation is continued.

A degassing pipeline: and water vapor generated in the cylinder body water jacket, the cylinder cover water jacket and the radiator enters the expansion water tank, redundant vapor is discharged into the atmosphere, and meanwhile, the expansion water tank is used for supplementing water to the water pump.

When in work:

when the water temperature t of the system is less than the thermostat opening temperature t1, the thermostat is closed, the system starts a small circulation mode, and the cooling liquid does not flow through the radiator, so that the engine reaches the optimal working temperature as soon as possible.

When the thermostat opening temperature t1 is lower than the system water temperature t lower than the thermostat full opening temperature t2, the thermostat is initially opened, and the system is opened in a large circulation mode. And the opening degree is gradually increased along with the rising of the water temperature, and meanwhile, the bypass branch is also opened simultaneously.

When the water temperature t of the system is higher than the full-open temperature t2 of the thermostat, the system starts a large circulation mode, and the bypass branch is closed.

The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.