CN218235242U

CN218235242U - Engine cooling system

Info

Publication number: CN218235242U
Application number: CN202222710963.3U
Authority: CN
Inventors: 于雪蕊; 刘振; 王洪忠
Original assignee: Weichai Power Co Ltd
Current assignee: Weichai Power Co Ltd
Priority date: 2022-10-14
Filing date: 2022-10-14
Publication date: 2023-01-06
Anticipated expiration: 2032-10-14

Abstract

The embodiment of the application discloses engine cooling system, including water pump, organism water jacket, cylinder cap water jacket, oil cooler, EGR cooler, thermostat and radiator, the water pump communicates with parallel arrangement's oil cooler and EGR cooler, and EGR cooler establishes ties with organism water jacket and cylinder cap water jacket, and the outlet pipe of cylinder cap water jacket communicates with the delivery port of water pump, and the delivery port of oil cooler communicates with the water inlet of thermostat, and the delivery port of radiator communicates with the return water mouth of water pump. The engine oil cooler and the EGR cooler are connected in parallel, the coolant output by the water pump is divided into two paths, the number of the branch paths is reduced, the coolant is divided into three paths in the prior art, the resistance of the system is adjusted to be distributed, the flow of the coolant in the branch paths supplying the liquid to the EGR cooler is increased, the water flow size of the EGR cooler and the stability of the water flow are improved, and the working reliability of the EGR cooler is improved.

Description

Engine cooling system

Technical Field

The application relates to the technical field of engines, in particular to an engine cooling system.

Background

The thermal load of a natural gas engine is higher than that of a diesel engine, the requirement on the cooling performance of an EGR cooler is higher, and meanwhile the risk of thermal fatigue failure of the EGR cooler is higher.

In the prior art, the EGR cooler is connected with a plurality of branches in parallel and shunted in a cooling system, and the water flow distributed by the EGR cooler is easily influenced by other branches, so that the reliability of the EGR cooler is reduced.

Therefore, how to improve the reliability of the operation of the EGR cooler becomes a technical problem to be solved by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

The application provides an engine cooling system to improve the reliability of EGR cooler work.

In order to achieve the purpose, the application provides an engine cooling system which is characterized by comprising a water pump, a machine body water jacket, a cylinder cover water jacket, an engine oil cooler, an EGR cooler, a thermostat and a radiator,

the engine oil cooler and the EGR cooler are connected in parallel, the water inlets of the engine oil cooler and the EGR cooler are communicated with the water pump, the EGR cooler is connected with the engine body water jacket in series,

the engine body water jacket is connected with the cylinder cover water jacket in series, a water outlet pipe of the cylinder cover water jacket is communicated with a water inlet of the thermostat, a water outlet of the engine oil cooler is communicated with a water inlet of the thermostat,

the small circulation water outlet of the thermostat is communicated with the water return port of the water pump, the large circulation water outlet of the thermostat is communicated with the water inlet of the radiator, and the water outlet of the radiator is communicated with the water return port of the water pump.

Preferably, in the engine cooling system, an EGR valve cooling pipe is further included for cooling the EGR valve, a water inlet of the EGR valve cooling pipe is communicated with the engine body water jacket, and a water outlet of the EGR valve cooling pipe is communicated with the water outlet pipe.

Preferably, in the above engine cooling system, the engine cooling system further includes an air compressor cooling pipe for cooling an air compressor, a water inlet of the air compressor cooling pipe is communicated with the engine body water jacket, and a water outlet of the air compressor cooling pipe is communicated with the water outlet pipe.

Preferably, in the engine cooling system, a supercharger cooling pipe is further included for cooling the supercharger, a water inlet of the supercharger cooling pipe is communicated with the engine body water jacket, and a water outlet of the supercharger cooling pipe is communicated with the water outlet pipe.

Preferably, in the above engine cooling system, a vaporizer is further included, a water inlet of the vaporizer is communicated with a water inlet of the thermostat, and a water outlet of the vaporizer is communicated with a water return port of the water pump.

Preferably, in the above engine cooling system, the engine cooling system further includes a warm air device, a water inlet of the warm air device is communicated with a water inlet of the thermostat, and a water outlet of the warm air device is communicated with a water return port of the water pump.

Preferably, in the engine cooling system, an expansion water tank is further included, a water inlet of the expansion water tank is communicated with the water outlet pipe, and a water outlet of the expansion water tank is communicated with a water return port of the water pump;

the expansion water tank is communicated with the radiator;

the expansion tank is in communication with the EGR cooler.

Preferably, in the engine cooling system described above, the water pump is a speed-adjustable water pump.

Preferably, in the engine cooling system described above, a fan is provided on the radiator.

Preferably, in the engine cooling system, the fan is communicatively connected to a water temperature sensor for detecting a temperature of the coolant of the radiator.

Preferably, in the engine cooling system described above, the EGR cooler is disposed rearward of the fan.

The engine cooling system that this application embodiment provided, including the water pump, the organism water jacket, the cylinder cap water jacket, the oil cooler, the EGR cooler, thermostat and radiator, the water pump communicates with the oil cooler and the EGR cooler of parallel arrangement, the EGR cooler is established ties with organism water jacket and cylinder cap water jacket, the outlet pipe of cylinder cap water jacket communicates with the water inlet of thermostat, the delivery port of oil cooler and the water inlet of thermostat communicate, the little circulating water outlet of thermostat communicates with the return water mouth of water pump, the big circulating water outlet of thermostat and the water inlet of radiator communicate, the delivery port of radiator and the return water mouth of water pump communicate. In this application, connect the oil cooler and EGR cooler in parallel, coolant liquid through the water pump output shunts into two the tunnel, wherein supply the EGR cooler all the way, supply the oil cooler all the way, this application has reduced the quantity of branch road, divide into the mode of three routes with the coolant liquid for prior art, through adjustment system resistance distribution, the flow of the coolant liquid in the branch road to the EGR cooler confession liquid has been increased, the water flow size of EGR cooler and the stability of water flow have been improved, thereby the reliability of EGR cooler work has been improved.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some examples or embodiments of the present application, and that for a person skilled in the art, other drawings can be obtained from the provided drawings without inventive effort, and that the present application can also be applied to other similar scenarios from the provided drawings. Unless otherwise apparent from the context, or otherwise indicated, like reference numbers in the figures refer to the same structure or operation.

Fig. 1 is a schematic structural diagram of an engine cooling system of the present application.

Wherein:

1. the engine oil cooler comprises a water pump, 2, an engine body water jacket, 3, a cylinder cover water jacket, 4, an engine oil cooler, 5, an EGR cooler, 6, a thermostat, 7, a radiator, 8, an EGR valve, 9, an air compressor, 10, a supercharger, 11, a fan, 12, an expansion water tank, 13, a warm air device, 14, a water outlet pipe, 15 and a carburetor.

Detailed Description

The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant application and are not limiting of the application. The described embodiments are only some embodiments of the present application and not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.

It should be noted that, for the convenience of description, only the parts related to the related applications are shown in the drawings. The embodiments and features of the embodiments in the present application may be combined with each other without conflict.

It should be understood that "system", "apparatus", "unit" and/or "module" as used herein is a method for distinguishing different components, elements, parts or assemblies at different levels. However, other words may be substituted by other expressions if they accomplish the same purpose.

As used in this application and the appended claims, the terms "a," "an," "the," and/or "the" are not intended to be inclusive in the singular, but rather are intended to be inclusive in the plural unless the context clearly dictates otherwise. In general, the terms "comprises" and "comprising" merely indicate that steps and elements are included which are explicitly identified, that the steps and elements do not form an exclusive list, and that a method or apparatus may include other steps or elements. An element defined by the phrase "comprising a component of ' 8230 ' \8230; ' does not exclude the presence of additional identical elements in the process, method, article, or apparatus that comprises the element.

Wherein in the description of the embodiments of the present application, "/" indicates an inclusive meaning, for example, a/B may indicate a or B; "and/or" herein is merely an association relationship describing an associated object, and means that there may be three relationships, for example, a and/or B, and may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of the present application, "a plurality" means two or more than two.

In the following, the terms "first", "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

Flowcharts are used herein to illustrate the operations performed by systems according to embodiments of the present application. It should be understood that the preceding or following operations are not necessarily performed in the exact order in which they are performed. Rather, the various steps may be processed in reverse order or simultaneously. Meanwhile, other operations may be added to or removed from these processes.

Please refer to fig. 1.

The engine cooling system is a system which transfers heat in an engine to cooling liquid and then radiates the heat to the atmosphere to reduce the temperature of the engine.

Some embodiments of the present application disclose an engine cooling system, including a water pump 1, a body water jacket 2, a cylinder head water jacket 3, an oil cooler 4, an EGR cooler 5, a thermostat 6, and a radiator 7.

The water pump 1 is used for pressurizing the coolant to ensure that the coolant circularly flows in the engine cooling system.

The thermostat 6 adjusts the temperature of the coolant by automatically controlling the flow rate and the circulation route of the coolant.

The radiator 7 radiates heat to the atmosphere.

The oil cooler 4 controls the temperature of the lubricating oil using the temperature of the coolant.

The EGR cooler 5 serves for cooling of the recirculating exhaust gases.

In the prior art, the EGR cooler 5, the engine water jacket 2, and the engine oil cooler 4 are connected in parallel, that is, the coolant output by the water pump 1 is divided into three paths, one of the three paths is supplied to the EGR cooler 5, the other path is supplied to the engine water jacket 2, and the other path is supplied to the engine oil cooler 4, so that the flow of the coolant divided to the EGR cooler 5 is limited.

In this application, parallelly connected oil cooler 4 and EGR cooler 5, organism water jacket 2 establishes ties with cylinder cap water jacket 3 three, coolant liquid through water pump 1 output divides into two the tunnel promptly, wherein supply EGR cooler 5 all the way, another way supplies oil cooler 4, the quantity of branch road has been reduced, divide into the mode of three routes with the coolant liquid for prior art, through adjustment system resistance distribution, the flow of the coolant liquid in the branch road that supplies liquid to EGR cooler 5 has been increased, the water flow size of EGR cooler 5 and the stability of water flow have been improved, thereby the reliability of EGR cooler 5 work has been improved.

The EGR cooler 5 is connected in series with the body water jacket 2, and the body water jacket 2 may be located upstream of the EGR cooler 5 or downstream of the EGR cooler 5.

In the embodiment in which the body water jacket 2 is located upstream of the EGR cooler 5, the water outlet of the EGR cooler 5 communicates with the head water jacket 3.

In the embodiment in which the block water jacket 2 is located downstream of the EGR cooler 5, the water outlet of the block water jacket 2 communicates with the head water jacket 3.

The description will be made with the body water jacket 2 located downstream of the EGR cooler 5.

An inlet of the EGR cooler 5 is communicated with a water outlet of the water pump 1, a water outlet of the EGR cooler 5 is communicated with a water inlet of the engine body water jacket 2, a water outlet of the engine body water jacket 2 is communicated with the cylinder cover water jacket 3, and cooling liquid sequentially passes through the EGR cooler 5, the engine body water jacket 2 and the cylinder cover water jacket 3 to cool the EGR cooler 5, the engine body water jacket 2 and the cylinder cover water jacket 3.

The EGR cooler 5 is located upstream of the body water jacket 2, and the EGR cooler 5 is closer to the water pump 1 than the body water jacket 2, that is, the temperature of the coolant entering the EGR cooler 5 is lower than the temperature of the coolant entering the body water jacket 2, thereby ensuring reliable cooling of the EGR cooler 5.

The water outlet pipe 14 of the cylinder cover water jacket 3 is communicated with the water inlet of the thermostat 6, and the water outlet of the engine oil cooler 4 is communicated with the water inlet of the thermostat 6.

The water pump 1 pressurizes the coolant, and one of the pressurized coolant flows into the EGR cooler 5, the engine block water jacket 2, and the cylinder head water jacket 3, and the other flows into the engine oil cooler 4. The coolant passing through the EGR cooler 5, the engine body water jacket 2 and the cylinder cover water jacket 3 firstly absorbs the heat of the EGR cooler 5, the temperature rises, the coolant flows through the engine body water jacket 2 to absorb the heat, the temperature rises again, the coolant flows through the cylinder cover water jacket 3, the temperature further rises, then the coolant enters the radiator 7 through the water outlet pipe 14 of the cylinder cover water jacket 3, the coolant passes through the large circulation water outlet of the thermostat 6, and the heat is radiated to the atmosphere through the radiator 7.

The radiator 7 cools the cooling liquid, and the cooled cooling liquid flows into the EGR cooler 5, the engine body water jacket 2 and the cylinder cover water jacket 3 again under the pressurizing action of the water pump 1, so that parts of the engine working under the high-temperature condition are cooled continuously, and the normal work of the engine is ensured.

The small circulation water outlet of the thermostat 6 is communicated with the water return port of the water pump 1, and the large circulation water outlet of the thermostat 6 is communicated with the water inlet of the radiator 7.

The cooling liquid is circulated in two paths, one path is a large circulation, and the other path is a small circulation. When the temperature of the cooling liquid is high, the cooling liquid is subjected to large circulation and enters the thermostat 6, a main valve of the thermostat 6 is opened, an auxiliary valve is closed, the cooling liquid flows through the radiator 7 to rapidly reduce the temperature of the cooling liquid, and then the cooling liquid flows to a water return port of the water pump 1; when the temperature of the cooling liquid is lower, the cooling liquid is circulated for a short time, the main valve of the thermostat 6 is closed, the auxiliary valve is opened, and the cooling liquid directly enters the water inlet of the water pump 1 behind the thermostat 6 and is not cooled by the radiator 7, so that the temperature of the engine cooling liquid is quickly raised to the normal temperature.

In some embodiments of the present application, the engine cooling system further comprises an EGR valve cooling pipe for cooling the EGR valve 8. The water inlet of the EGR valve cooling pipe is communicated with the engine body water jacket 2, and the water outlet of the EGR valve cooling pipe is communicated with the water outlet pipe 14.

The EGR valve cooling pipe is used for cooling the EGR valve 8, and when the EGR valve cooling pipe cools the EGR valve 8, the work of the EGR valve 8 in an EGR system cannot be influenced. The EGR valve cooling pipe may be provided around the EGR valve 8, or a cooling chamber communicating with the EGR valve cooling pipe may be provided in the EGR valve 8.

This application is through setting up EGR valve cooling tube, cools off waste gas after EGR cooler 5 once more, improves EGR cooler 5 to waste gas cooling's reliability.

In some embodiments of the present application, the engine cooling system further includes an air compressor cooling pipe for cooling the air compressor 9. The water inlet of the air compressor cooling pipe is communicated with the machine body water jacket 2, and the water outlet of the air compressor cooling pipe is communicated with the water outlet pipe 14.

The air compressor cooling pipe is used for cooling the air compressor 9, and when the air compressor 9 is cooled by the air compressor cooling pipe, the work of the air compressor 9 cannot be influenced. The air compressor cooling pipe can be wound on the air compressor 9, and a cooling cavity communicated with the air compressor cooling pipe can also be formed in the air compressor 9.

In some embodiments of the present application, the engine cooling system further comprises a supercharger cooling pipe for cooling the supercharger 10. The water inlet of the supercharger cooling pipe is communicated with the engine body water jacket 2, and the water outlet of the supercharger cooling pipe is communicated with the water outlet pipe 14.

The supercharger cooling pipe is used to cool the supercharger 10, and when the supercharger cooling pipe cools the supercharger 10, the operation of the supercharger 10 is not affected. The supercharger cooling pipe may be wound around the supercharger 10, or a cooling chamber communicating with the supercharger cooling pipe may be provided in the supercharger 10.

As shown in fig. 1, the head water jacket 3, the EGR valve cooling pipe, the air compressor cooling pipe, and the supercharger cooling pipe are arranged in parallel.

In order to realize the cooling control of the EGR valve cooling pipe, the air compressor cooling pipe, and the supercharger cooling pipe, valves may be provided on the EGR valve cooling pipe, the air compressor cooling pipe, and the supercharger cooling pipe.

The engine cooling system disclosed in the present application further comprises a vaporizer 15, and the vaporizer 15 is used for vaporizing the liquefied natural gas to ensure normal gas supply of the engine.

The water inlet of the vaporizer 15 is communicated with the water inlet of the thermostat 6, or the water inlet of the vaporizer 15 is communicated with the water outlet pipe 14, and the water outlet of the vaporizer 15 is communicated with the water return port of the water pump 1. The coolant entering the vaporizer 15 absorbs the heat of the EGR cooler 5, the engine body water jacket 2, the EGR valve 8, the air compressor 9 and the supercharger 10, and the temperature is relatively high, so that the temperature requirement of the vaporizer 15 can be met.

The vaporizer 15 can recycle the heat absorbed by the coolant and cool the coolant at the same time.

The application discloses engine cooling system still includes hot air device 13, and the water inlet of hot air device 13 and the water inlet intercommunication of temperature saver 6, perhaps, the water inlet and the outlet pipe 14 intercommunication of hot air device 13, the delivery port of hot air device 13 and the return water mouth intercommunication of water pump 1.

The air heater 13 can absorb heat of the EGR cooler 5, the body water jacket 2, the EGR valve 8, the air compressor 9 and the supercharger 10, thereby recycling the heat.

The cooling liquid cooled by the warm air device 13 returns to the water pump 1 to participate in the circulation again. The heat absorbed by the heater 13 can be blown through the blast pipe to the window for defrosting or blown out from the damper for heating the cab.

In some embodiments of the present application, the engine cooling system further includes an expansion water tank 12, the expansion water tank 12 is located between the water pump 1 and the cylinder head water jacket 3, a water inlet of the expansion water tank 12 is communicated with a water outlet pipe 14 of the cylinder head water jacket 3, and a water outlet of the expansion water tank 12 is communicated with a water return port of the water pump 1. The expansion tank 12 can supplement the cooling liquid.

The water inlet of the expansion tank 12 communicates not only with the water outlet pipe 14 of the cylinder head water jacket 3, but also with the EGR cooler 5 and the radiator 7.

In some embodiments of the present application, the water pump 1 is a variable speed water pump.

The application discloses engine cooling system through optimizing arrangement, establishes ties EGR cooler 5 in cooling system, has reduced the reposition of redundant personnel branch road of water pump 1 play water, and the discharge of EGR cooler 5 distribution increases, has guaranteed reliability and cooling system's robustness under self high thermal load operating mode.

The engine cooling system disclosed in the application establishes ties EGR cooler 5 in cooling system, has realized the redistribution of engine cooling system resistance, has reduced whole engine cooling system's resistance, and the operating mode point matches 1 flow reduction of water pump, 1 consumption reduction of water pump.

5 discharge surplus promotion of full-flow EGR cooler in this application can cooperate speed governing water pump and control strategy to use, reduces 1 consumption of water pump.

In order to further enhance the heat dissipation effect of the heat sink 7, the present application provides a fan 11 on the heat sink 7.

The fan 11 rotates to assist the heat sink 7 in dissipating heat. The activation of the fan 11 is controlled by a water temperature sensor. The water temperature sensor is used for detecting the temperature of the cooling liquid of the radiator 7, when the temperature of the cooling liquid detected by the water temperature sensor is higher than a first preset temperature, the fan 11 is started, and when the temperature of the cooling liquid detected by the water temperature sensor is lower than a second preset temperature, the fan 11 is closed. Wherein the second preset temperature is lower than the first preset temperature.

This application sets up EGR cooler 5 at the rear of fan 11, and whole car operation in-process EGR cooler 5 is located the windward side, is favorable to EGR cooler 5 to dispel the heat.

The foregoing description is only illustrative of the preferred embodiments of the present application and the principles of the technology employed and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. The scope of the application referred to in the present application is not limited to the specific combinations of the above-mentioned features, and it is intended to cover other embodiments in which the above-mentioned features or their equivalents are arbitrarily combined without departing from the spirit of the application. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims

1. An engine cooling system is characterized by comprising a water pump (1), a machine body water jacket (2), a cylinder cover water jacket (3), an engine oil cooler (4), an EGR cooler (5), a thermostat (6) and a radiator (7),

the engine oil cooler (4) and the EGR cooler (5) are connected in parallel, water inlets of the engine oil cooler (4) and the EGR cooler (5) are communicated with the water pump (1), the EGR cooler (5) is connected with the engine body water jacket (2) in series,

the engine body water jacket (2) is connected with the cylinder cover water jacket (3) in series, a water outlet pipe (14) of the cylinder cover water jacket (3) is communicated with a water inlet of the thermostat (6), a water outlet of the engine oil cooler (4) is communicated with a water inlet of the thermostat (6),

the small circulation water outlet of the thermostat (6) is communicated with the water return port of the water pump (1), the large circulation water outlet of the thermostat (6) is communicated with the water inlet of the radiator (7), and the water outlet of the radiator (7) is communicated with the water return port of the water pump (1).

2. The engine cooling system according to claim 1, further comprising an EGR valve cooling pipe for cooling an EGR valve (8), a water inlet of the EGR valve cooling pipe being in communication with the body water jacket (2), and a water outlet of the EGR valve cooling pipe being in communication with the water outlet pipe (14).

3. The engine cooling system according to claim 2, further comprising an air compressor cooling pipe for cooling an air compressor (9), an inlet of the air compressor cooling pipe being in communication with the body water jacket (2), and an outlet of the air compressor cooling pipe being in communication with the outlet pipe (14).

4. The engine cooling system according to claim 3, characterized by further comprising a supercharger cooling pipe for cooling a supercharger (10), wherein a water inlet of the supercharger cooling pipe is communicated with the engine block water jacket (2), and a water outlet of the supercharger cooling pipe is communicated with the water outlet pipe (14).

5. The engine cooling system according to claim 1, characterized by further comprising a vaporizer (15), wherein a water inlet of the vaporizer (15) is communicated with a water inlet of the thermostat (6), and a water outlet of the vaporizer (15) is communicated with a water return port of the water pump (1).

6. The engine cooling system according to claim 1, characterized by further comprising a warm air device (13), wherein a water inlet of the warm air device (13) is communicated with a water inlet of the thermostat (6), and a water outlet of the warm air device (13) is communicated with a water return port of the water pump (1).

7. The engine cooling system according to claim 1, characterized by further comprising an expansion water tank (12), wherein a water inlet of the expansion water tank (12) is communicated with the water outlet pipe (14), and a water outlet of the expansion water tank (12) is communicated with a water return port of the water pump (1);

the expansion water tank (12) is communicated with the radiator (7);

the expansion tank (12) is in communication with the EGR cooler (5).

8. Engine cooling system according to claim 1, characterized in that the water pump (1) is a speed water pump.

9. Engine cooling system according to claim 1, characterized in that a fan (11) is provided on the radiator (7).

10. Engine cooling system according to claim 9, characterized in that the fan (11) is in communication with a water temperature sensor for detecting the coolant temperature of the radiator (7).

11. Engine cooling system according to claim 9, characterised in that the EGR cooler (5) is arranged behind the fan (11).