CN115045746A

CN115045746A - Cooling system of engine

Info

Publication number: CN115045746A
Application number: CN202111341592.XA
Authority: CN
Inventors: 崔鹏程; 刘志东
Original assignee: Great Wall Motor Co Ltd
Current assignee: Great Wall Motor Co Ltd
Priority date: 2021-11-12
Filing date: 2021-11-12
Publication date: 2022-09-13

Abstract

The invention provides a cooling system of an engine, comprising: a cylinder cover lower layer water jacket; an upper water jacket of the cylinder cover; the cylinder body water jacket, the cylinder cover lower floor water jacket communicates with cylinder cover upper floor water jacket, cylinder body water jacket separately, the splitter plate divides the cylinder body water jacket into cylinder body upper floor water jacket and cylinder body lower floor water jacket communicated in series; the electronic water pump is provided with a water pump inlet and a water pump outlet, and the water pump outlet is communicated with the lower-layer water jacket of the cylinder cover; the thermostat module assembly is respectively communicated with the upper-layer water jacket of the cylinder cover, the lower-layer water jacket of the cylinder body and the water pump inlet; a heat sink. Therefore, the cooling system controls the cooling liquid to firstly flow into the water jacket of the lower layer of the cylinder cover to cool the lower layer of the cylinder cover and then cool the cylinder body and the upper layer of the cylinder cover.

Description

Cooling system of engine

Technical Field

The invention relates to the technical field of vehicles, in particular to a cooling system of an engine.

Background

In the related art, when a cooling system of an existing engine cools the engine, coolant first flows into a cylinder water jacket and then flows into a cylinder head water jacket from the cylinder water jacket, that is, the cooling system cools a cylinder and a cylinder head of the engine in sequence. The cooling demand of the cylinder body is low, the cylinder body needs to work at a high working temperature so as to reduce friction between a piston and the cylinder body of the engine, the cooling demand of the cylinder cover is high, the cylinder cover needs to work at a low working temperature so as to reduce the temperature of a combustion chamber and reduce the detonation problem of the engine, and because the cylinder body is cooled by a cooling system firstly and then the cylinder cover is cooled, and the flow path of cooling liquid cannot meet the cooling demand of the cylinder body and the cylinder cover, the cylinder body and the cylinder cover cannot be at the corresponding optimal working temperature, so that the running efficiency of the engine is reduced.

Disclosure of Invention

In view of this, the present invention provides a cooling system for an engine, which can meet cooling requirements of different areas of the engine, and can make working temperatures of a cylinder block and a cylinder head both at corresponding optimal working temperatures, so as to improve operating efficiency of the engine.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

a cooling system of an engine comprising: a cylinder cover lower layer water jacket; an upper water jacket of the cylinder cover; the cylinder body water jacket is communicated with the cylinder cover upper-layer water jacket and the cylinder body water jacket respectively, a partition plate is arranged in the cylinder body water jacket, and the partition plate divides the cylinder body water jacket into a cylinder body upper-layer water jacket and a cylinder body lower-layer water jacket which are communicated in series; the electronic water pump is provided with a water pump inlet and a water pump outlet, and the water pump outlet is communicated with the lower-layer water jacket of the cylinder cover; the thermostat module assembly is respectively communicated with the upper-layer water jacket of the cylinder cover, the lower-layer water jacket of the cylinder body and the water pump inlet; and the radiator is communicated with the thermostat module assembly.

In some examples of the invention, the thermostat module assembly includes a first thermostat and a second thermostat, a bypass water path is connected between the first thermostat and the second thermostat, the bypass water path selectively communicates the first thermostat and the second thermostat, the first thermostat communicates with the cylinder cover upper water jacket and the cylinder body lower water jacket respectively, and the second thermostat communicates with the water pump inlet; the radiator is respectively communicated with the first thermostat and the second thermostat.

In some examples of the present invention, the cooling system of an engine further includes: and the engine oil cooler is respectively communicated with the water pump outlet and the second thermostat.

In some examples of the present invention, the cooling system of an engine further includes: and the EGR cooler is respectively communicated with the water pump outlet and the second thermostat.

In some examples of the present invention, the cooling system of an engine further includes: the warm air is connected between the EGR cooler and the second thermostat in series and communicated with the EGR cooler and the second thermostat respectively.

In some examples of the present invention, the cooling system of an engine further includes: the expansion kettle is communicated with the water jacket on the upper layer of the cylinder cover through a first exhaust pipe, the expansion kettle is further communicated with the radiator through a second exhaust pipe, and the expansion kettle is further communicated with the second thermostat through a liquid supplementing pipe.

In some examples of the invention, the water pump outlet and the cylinder head lower layer water jacket are communicated through a water inlet manifold, the water inlet manifold is communicated with the EGR cooler through a first communicating pipe, and the water inlet manifold is communicated with the engine oil cooler through a second communicating pipe.

In some examples of the present invention, the oil cooler communicates with the second thermostat through a third communicating pipe.

In some examples of the invention, the warm air is communicated with the EGR cooler through a fourth communication pipe, and the warm air is communicated with the second thermostat through a fifth communication pipe; the first thermostat is communicated with the upper-layer water jacket of the cylinder cover through a sixth communicating pipe, the first thermostat is also communicated with a radiator inlet of the radiator through a seventh communicating pipe, and the first thermostat is also communicated with the lower-layer water jacket of the cylinder body through an eighth communicating pipe; and a radiator outlet of the radiator is communicated with the second thermostat through a ninth communicating pipe.

In some examples of the present invention, the cylinder head lower water jacket communicates with the cylinder head upper water jacket through a first connection port, the cylinder head lower water jacket communicates with the cylinder block water jacket through a second connection port, and an area of the first connection port is larger than an area of the second connection port; the partition plate is provided with a connecting hole penetrating through the partition plate so as to connect the cylinder body upper-layer water jacket and the cylinder body lower-layer water jacket in series; the depth of the water jacket on the upper layer of the cylinder body is H1, the depth of the water jacket on the lower layer of the cylinder body is H2, and the relation is satisfied: h1 < H2.

Compared with the prior art, the cooling system of the engine has the following advantages:

according to the cooling system of the engine, the cooling liquid is controlled by the cooling system to firstly flow into the water jacket at the lower layer of the cylinder cover to cool the lower layer of the cylinder cover, and then the cylinder body and the upper layer of the cylinder cover are cooled.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic diagram of a cooling system according to an embodiment of the present invention;

FIG. 2 is a schematic view of a thermostat module assembly according to an embodiment of the present invention;

FIG. 3 is a cross-sectional view of a portion of a thermostat module assembly according to an embodiment of the invention;

FIG. 4 is a schematic view of a cylinder block water jacket according to an embodiment of the present invention;

FIG. 5 is a schematic view of a divider plate according to an embodiment of the present invention;

FIG. 6 is a cross-sectional view of the cylinder block with a water jacket with a divider plate mounted thereon according to an embodiment of the present invention;

FIG. 7 is a block diagram of a cooling system according to an embodiment of the present invention.

Description of reference numerals:

a cooling system 100;

a cylinder head lower layer water jacket 210; a cylinder head upper water jacket 220; a cylinder jacket 230; a cylinder upper water jacket 231; a cylinder body lower layer water jacket 232; a second connection port 240; a partition plate 250; a connection hole 260; a cylinder water jacket water outlet 270; a cylinder head water jacket water outlet 280;

an electronic water pump 10; a water pump outlet 11;

a thermostat module assembly 20; a first thermostat 21; a second thermostat 22; a bypass water path 23; a communication port 24; a first mixing chamber 25; a second mixing chamber 26;

a heat sink 30; an oil cooler 40; the EGR cooler 50; warm air 60;

an expansion water jug 70; a first exhaust pipe 71; a second exhaust pipe 72; a liquid replenishing pipe 73;

a water inlet manifold 81; a first communication pipe 82; the second communicating pipe 83; the third communicating tube 84; the fourth communication pipe 85; a fifth communicating pipe 86; the sixth communication pipe 87; the seventh communicating pipe 88; the eighth communication pipe 89; and a ninth communication pipe 810.

Detailed Description

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

As shown in fig. 1 to 7, according to the cooling system 100 of the engine according to the embodiment of the present invention, the engine may be a gasoline engine, a diesel engine, or the like, and the engine may be a multi-cylinder engine, for example, the engine may be a four-cylinder engine, a six-cylinder engine, an eight-cylinder engine, or the like, the engine may define a plurality of combustion chambers, fuel may be combusted in the combustion chambers, gas generated by the combustion may push pistons in the combustion chambers to move to generate power, and the power may drive a vehicle to run. The present invention will be described below with reference to the engine being a four-cylinder engine, the four-cylinder engine may have four combustion chambers, the four combustion chambers may be spaced apart from each other and may be 1 cylinder of the engine, 2 cylinders of the engine, 3 cylinders of the engine, and 4 cylinders of the engine from a front end of the engine to a rear end of the engine, and a front-rear direction of the engine may be a front-rear direction in fig. 1.

The cooling system 100 includes: the engine comprises a cylinder cover lower-layer water jacket 210, a cylinder cover upper-layer water jacket 220, a cylinder body water jacket 230, an electronic water pump 10, a thermostat module assembly 20 and a radiator 30. The cylinder cover lower layer water jacket 210, the cylinder cover upper layer water jacket 220 and the cylinder body water jacket 230 can jointly form a cooling water jacket of the engine, the cylinder cover lower layer water jacket 210 is respectively communicated with the cylinder cover upper layer water jacket 220 and the cylinder body water jacket 230, a partition plate 250 is arranged in the cylinder body water jacket 230, and the partition plate 250 divides the cylinder body water jacket 230 into a cylinder body upper layer water jacket 231 and a cylinder body lower layer water jacket 232 which are communicated in series.

The cylinder cover lower layer water jacket 210, the cylinder cover upper layer water jacket 220 and the cylinder body water jacket 230 can be arranged in an extending mode in the radial direction of the engine, after cooling liquid enters the cylinder cover lower layer water jacket 210, the cooling liquid flows in the radial direction of the engine firstly, the cooling liquid can flow from the 1 cylinder position of the engine to the 4 cylinder position of the engine, each combustion chamber of the engine is internally provided with a nose bridge portion, the nose bridge portion can be a region where the combustion chamber is clamped between two throttle valves, the cooling liquid can flow towards the nose bridge portion of each combustion chamber in the process of flowing from the 1 cylinder of the engine to the 4 cylinders of the engine, the cooling liquid can cool exhaust valves and spark plugs of the cylinders of the engine, the temperatures of the exhaust valves and the spark plugs of the cylinders of the engine can be reduced, and accordingly the probability of knocking of the combustion chambers can be reduced.

After the cooling liquid is cooled in the cylinder head lower water jacket 210, the cooling liquid can flow out of the cylinder head lower water jacket 210 from a liquid outlet of the cylinder head lower water jacket 210, two liquid outlets can be arranged on the cylinder head lower water jacket 210, one of the liquid outlets can be communicated with the cylinder head upper water jacket 220, the other liquid outlet can be communicated with the cylinder body water jacket 230, the cooling liquid in the cylinder head lower water jacket 210 can be distributed to the cylinder head upper water jacket 220 and the cylinder body water jacket 230 through the two liquid outlets, and the cooling liquid in the cylinder head upper water jacket 220 and the cooling liquid in the cylinder body water jacket 230 can respectively cool the cylinder head upper water jacket and the cylinder body. It should be noted that the cooling water jacket of the engine may not cool the intake side of the engine cylinder to increase the intake air temperature of the combustion chamber.

Further, the partition plate 250 may have a horizontal plate that may be placed horizontally with respect to the engine within the block water jacket 230, and the head upper layer water jacket 220, the head lower layer water jacket 210, the block upper layer water jacket 231, and the block lower layer water jacket 232 may be stacked in this order in the height direction of the engine. Also, the divider plate 250 may define a first block flow path, which may be an unclosed flow path, which may be disposed around a plurality of combustion chambers of the engine. After the coolant enters the cylinder upper water jacket 231 from the second connection port 240, the coolant can flow along the first cylinder flow path, and the coolant can cool the cylinder upper layer, so that the cylinder upper layer can be prevented from being burst by overheating. The coolant may flow into the block lower layer water jacket 232 after flowing to the end of the first block flow path, and the coolant may cool the block lower layer.

It should be noted that, the position of the mixed gas in the combustion chamber during combustion is closer to the upper region of the cylinder body, the cooling demand of the lower region of the cylinder body is lower than the cooling demand of the upper region of the cylinder body, the upper region of the cylinder body and the lower region of the cylinder body are cooled firstly and secondly by controlling the cooling liquid, the temperature of the combustion chamber can be reduced, the probability of knocking occurring in the combustion chamber can be reduced, the temperature of the lower region of the cylinder body can also be increased, the friction between the piston of the engine and the cylinder body can be reduced, thereby the cooling demands of different regions of the cylinder body can be met, compared with the prior art, the cooling liquid is controlled to sequentially cool each region of the engine according to the cooling demands of different regions of the engine, the working temperatures of the cylinder body and the cylinder cover can be both at the corresponding optimal working temperatures, and further the running efficiency of the engine can be improved.

Further, the electronic water pump 10 has a water pump inlet and a water pump outlet 11, and the water pump outlet 11 is communicated with the cylinder head lower layer water jacket 210. Wherein, cylinder cap lower floor water jacket 210 can be provided with the water jacket water inlet, and cooling system 100 can include: the water inlet manifold 81 is connected with the water jacket water inlet, the other end of the water inlet manifold 81 can be connected with the water pump outlet 11, the water jacket water inlet can be connected with the electronic water pump 10 through the water inlet manifold 81, the electronic water pump 10 can pump the cooling liquid into the electronic water pump 10 from the water pump inlet, the electronic water pump 10 can pump the cooling liquid out of the water pump outlet 11, and the pumped cooling liquid can enter the cooling water jacket of the engine through the water jacket water inlet to cool the engine.

Further, as shown in fig. 1, the water pump inlet and the water pump outlet 11 of the electric water pump 10 may extend toward the front side of the cooling system 100 and the rear side of the cooling system 100, and the front-rear direction of the cooling system 100 may be the front-rear direction in fig. 1, and in order to facilitate connection between the electric water pump 10 and the head-lower water jacket 210, the water jacket inlet may be provided near the 1-cylinder position of the engine, and the water jacket inlet may be provided extending toward the front side of the cooling system 100.

Further, as shown in fig. 1-3, the thermostat module assembly 20 is respectively communicated with the cylinder head upper layer water jacket 220, the cylinder body lower layer water jacket 232 and the water pump inlet. The coolant in the water jacket 220 on the upper layer of the cylinder cover and the coolant in the water jacket 232 on the lower layer of the cylinder body can both flow into the thermostat module assembly 20, further, the coolant in the multiple cooling flow paths of the cooling system can converge and flow into the thermostat module assembly 20 after cooling is completed, and the coolant can flow to the electronic water pump 10 together after converging in the thermostat module assembly 20.

The thermostat module assembly 20 comprises a first thermostat 21 and a second thermostat 22, a bypass water path 23 is connected between the first thermostat 21 and the second thermostat 22, the bypass water path 23 selectively communicates with the first thermostat 21 and the second thermostat 22, the first thermostat 21 is respectively communicated with the cylinder head upper-layer water jacket 220 and the cylinder body lower-layer water jacket 232, and the second thermostat 22 is communicated with a water pump inlet. The cylinder head upper water jacket 220 may be provided with a cylinder head water jacket water outlet 280, the cylinder head water jacket water outlet 280 may be disposed right above the cylinder head integrated exhaust port, the cylinder body lower water jacket 232 may be provided with a cylinder body water jacket water outlet 270, the first thermostat 21 and the second thermostat 22 may be respectively provided with a plurality of communication ports 24, and the cylinder head water jacket water outlet 280 and the cylinder body water jacket water outlet 270 may be respectively communicated with two corresponding communication ports 24 on the first thermostat 21.

Meanwhile, the first thermostat 21 may define a first mixing chamber 25, the second thermostat 22 may define a second mixing chamber 26, the bypass water path 23 may selectively communicate the first mixing chamber 25 with the second mixing chamber 26, the coolant that has finished cooling in the head upper water jacket 220 may flow into the first mixing chamber 25 through the head water jacket water outlet 280, the coolant that has finished cooling in the block water jacket 230 may flow into the first mixing chamber 25 through the block water jacket water outlet 270, the coolant may finish mixing in the first mixing chamber 25, and the coolant may flow from the first mixing chamber 25 to the second mixing chamber 26 when the bypass water path 23 communicates the first mixing chamber 25 with the second mixing chamber 26.

Further, as shown in fig. 1 and 7, the plurality of communication ports 24 of the second thermostat 22 may be connected to other components in the engine compartment that need to be cooled, after the cooling system 100 completes cooling of the components in the engine compartment, the coolant may flow into the second mixing chamber 26 through the plurality of communication ports 24 of the second thermostat 22, the coolant flowing into the second mixing chamber 26 from the first mixing chamber 25 may be mixed with the coolant flowing into the second mixing chamber 26 from the plurality of communication ports 24 of the second thermostat 22, and the mixed coolant may flow from the communication port 24 of the second thermostat 22 connected to the electronic water pump 10, so as to realize the circulation flow of the coolant in the cooling system 100.

In addition, the cooling system 100 is provided with a radiator 30, the radiator 30 is respectively communicated with the first thermostat 21 and the second thermostat 22, and the radiator 30 can exchange heat between the cooling liquid and the outside air, so that the temperature of the cooling liquid in the cooling system 100 can be rapidly reduced. Also, the radiator 30 may selectively communicate with the second thermostat 22, and specifically, the second thermostat 22 is provided with a communication valve that may control the bypass water path 23 to communicate or disconnect the first mixing chamber 25 and the second mixing chamber 26, and the communication valve may control the radiator 30 to disconnect or communicate with the second thermostat 22. When the communication valve is opened, the bypass water path 23 may communicate the first mixing chamber 25 and the second mixing chamber 26, and the radiator 30 may be disconnected from the second thermostat 22, and the coolant in the first mixing chamber 25 may flow to the second mixing chamber 26 through the bypass water path 23, and the coolant in the first mixing chamber 25 may not flow to the second mixing chamber 26 through the radiator 30.

When the communication valve is closed, the bypass water path 23 may disconnect the first mixing chamber 25 and the second mixing chamber 26, and the radiator 30 may communicate with the second thermostat 22, the coolant in the first mixing chamber 25 may not flow to the second mixing chamber 26 through the bypass water path 23, and the coolant in the first mixing chamber 25 may flow to the second mixing chamber 26 through the radiator 30. Compared with the coolant in the first mixing chamber 25 flowing to the second mixing chamber 26 through the radiator 30, the coolant in the first mixing chamber 25 has less heat loss in the process of flowing to the second mixing chamber 26 through the bypass water path 23, and the coolant is heated more quickly.

As shown in fig. 1 and 7, the cooling system 100 may further include a sixth communication pipe 87, a seventh communication pipe 88, an eighth communication pipe 89, and a ninth communication pipe 810, one end of the sixth communication pipe 87 may be communicated with the cylinder head water jacket outlet 280, the other end of the sixth communication pipe 87 may be communicated with the corresponding communication port 24 of the first thermostat 21, and the coolant in the cylinder head upper water jacket 220 may flow to the first thermostat 21 through the sixth communication pipe 87, so as to achieve the technical effect of communicating the first thermostat 21 with the cylinder head upper water jacket 220. One end of the eighth communication pipe 89 may be communicated with the cylinder water jacket outlet 270, the other end of the eighth communication pipe 89 may be communicated with the corresponding communication port 24 of the first thermostat 21, and the coolant in the cylinder lower water jacket 232 may flow to the first thermostat 21 through the eighth communication pipe 89, so as to achieve the technical effect of communication between the first thermostat 21 and the cylinder water jacket 230.

One end of the seventh communicating pipe 88 may be communicated with the corresponding communicating port 24 of the first thermostat 21, the other end of the seventh communicating pipe 88 may be communicated with the radiator inlet, and the coolant in the first mixing chamber 25 may flow to the radiator 30 through the seventh communicating pipe 88, so that the coolant may dissipate heat and cool in the radiator 30. In addition, one end of the ninth communication pipe 810 may be communicated with the corresponding communication port 24 of the second thermostat 22, the other end of the ninth communication pipe 810 may be communicated with the radiator outlet, the coolant cooled in the radiator 30 may flow to the second mixing chamber 26 through the ninth communication pipe 810, and the second mixing chamber 26 may discharge the cooled coolant to the electronic water pump 10, so as to implement the cooling circulation of the coolant in the cooling system 100.

Further, the first thermostat 21 may be provided with a first opening temperature, the second thermostat 22 may be provided with a second opening temperature, and when the temperature of the coolant in the first mixing chamber 25 is lower than the first opening temperature of the first thermostat 21, the first thermostat 21 may be in a closed state, and neither the coolant that has been cooled in the head upper water jacket 220 nor the coolant that has been cooled in the block water jacket 230 may flow into the first mixing chamber 25, that is, the cooling system 100 may not perform circulating cooling on the engine, so that the temperature of the engine may be raised faster, and in the engine warming-up process, by making the first thermostat 21 in a closed state, the engine warming-up time may be reduced, so that the energy consumption in the vehicle warming-up process may be reduced, and the vehicle may reach an optimal operating condition faster, so that the fuel economy of the vehicle may be improved.

When the temperature of the cooling fluid in the first mixing chamber 25 is higher than the first opening temperature of the first thermostat 21, the first thermostat 21 may be in an open state, and the cooling fluid that has been cooled in the head upper water jacket 220 and the cooling fluid that has been cooled in the block water jacket 230 may flow into the first mixing chamber 25, that is, the cooling system 100 may cool the engine, so that the temperature of the engine may be lowered, the engine may be prevented from being damaged by overheating, and the operating stability of the engine may be improved.

The second thermostat 22 can open or close the communication valve according to the temperature control, when the temperature of the cooling liquid in the second mixing chamber 26 is lower than the second opening temperature of the second thermostat 22, the second thermostat 22 can control the communication valve to be in an open state, the bypass water path 23 can communicate the first mixing chamber 25 and the second mixing chamber 26, the cooling liquid can not pass through the radiator 30, the temperature of the cooling liquid can be raised more quickly, and the warm-up process of the engine can be accelerated.

When the temperature of the cooling liquid in the second mixing chamber 26 is higher than the second opening temperature of the second thermostat 22, the second thermostat 22 can control the communication valve to be in the closed state, the bypass water path 23 can disconnect the first mixing chamber 25 and the second mixing chamber 26, and the cooling liquid can be cooled through the radiator 30, so that the temperature of the cooling liquid can be reduced, and the cooling effect of the cooling system 100 can be improved.

Further, the first opening temperature may be lower than the second opening temperature, when the temperature of the coolant in the first mixing chamber 25 is lower than the first opening temperature of the first thermostat 21 and the temperature of the coolant in the second mixing chamber 26 is lower than the second opening temperature of the second thermostat 22, the first thermostat 21 may be in a closed state, so that the temperature of the engine may be raised faster, and the second thermostat 22 may control the communication valve to be in an open state, and the bypass water path 23 may communicate the first mixing chamber 25 and the second mixing chamber 26, so that the coolant may not pass through the radiator 30, thereby further increasing the warming-up speed of the engine. When the first thermostat 21 is not opened, the coolant that cools the components in the engine compartment may flow back into the second thermostat 22, and then flow into the electronic water pump 10 through the communication port 24 of the second thermostat 22 that is connected to the electronic water pump 10, so as to achieve the circulation flow of the coolant in the cooling system 100. That is, the opening or closing of the first thermostat 21 does not affect the cooling system 100 in cooling the various components in the engine compartment.

When the temperature of the coolant in the first mixing chamber 25 is higher than the first opening temperature of the first thermostat 21 and the temperature of the coolant in the second mixing chamber 26 is lower than the second opening temperature of the second thermostat 22, the first thermostat 21 may be in an open state, the coolant having completed cooling in the head upper water jacket 220 and the coolant having completed cooling in the block water jacket 230 may be caused to flow into the first mixing chamber 25, and the cooling system 100 may cool the engine, so that local overheating damage of the engine may be prevented. And the second thermostat 22 can control the communication valve to be in an open state, the bypass water path 23 can communicate the first mixing chamber 25 and the second mixing chamber 26, the coolant can not pass through the radiator 30, and the engine can be kept at a high warming-up speed.

When the temperature of the coolant in the first mixing chamber 25 is higher than the first opening temperature of the first thermostat 21 and the temperature of the coolant in the second mixing chamber 26 is higher than the second opening temperature of the second thermostat 22, the first thermostat 21 may be in an open state, the coolant having completed cooling in the head upper water jacket 220 and the coolant having completed cooling in the block water jacket 230 may be caused to flow into the first mixing chamber 25, and the cooling system 100 may cool the engine, so that the engine may be prevented from being damaged by overheating. And the second thermostat 22 can control the communication valve to be in a closed state, the bypass water path 23 can disconnect the first mixing chamber 25 and the second mixing chamber 26, the cooling liquid can be cooled through the radiator 30, and the temperature of the cooling liquid in the cooling system 100 can meet the cooling requirement of the engine.

Therefore, other components in the engine and the engine compartment are respectively connected with the first thermostat 21 or the second thermostat 22, the first thermostat 21 and the second thermostat 22 can be respectively communicated with the components at different temperatures, and compared with the prior art, when other components in the engine and the engine compartment which need to be cooled respectively reach the optimal working condition, the cooling system 100 can cool the components, so that the energy consumption of the vehicle can be reduced, and the fuel economy of the vehicle can be improved.

According to some specific embodiments of the present invention, a wax pack may be disposed in each of the first thermostat 21 and the second thermostat 22, and the first thermostat 21 and the second thermostat 22 may control the opening and closing processes of the first thermostat 21 and the second thermostat 22 by melting the wax pack. Further, a heating device may be disposed in the second thermostat 22, and the heating device may heat the wax pack in the second thermostat 22. The wax packet in the second thermostat 22 is heated by the heating device, so that the second thermostat 22 can reach the second opening temperature more quickly, the cooling liquid can enter the radiator 30 in advance to dissipate heat, the engine can work at a specific temperature, and the temperature requirements of the engine on the cooling liquid under different working conditions can be met.

In some embodiments of the present invention, as shown in fig. 1 and 7, the cooling system 100 may further include: and the oil cooler 40 is communicated with the water pump outlet 11 and the second thermostat 22 respectively, and the oil cooler 40 is communicated with the water pump outlet 11 and the second thermostat 22 respectively. Wherein, machine oil can be used for the spare part in the lubricated engine, and machine oil can exchange heat with the spare part in the engine, the heat that produces when machine oil can absorb the spare part motion in the engine, thereby can improve the life of engine, oil cooler 40 can be used for cooling down machine oil, and, can be provided with first communicating pipe 82 on the water inlet manifold 81, oil cooler 40 can communicate with first communicating pipe 82, so that oil cooler 40 and water pump outlet 11 intercommunication, the back is pumped out from water pump outlet 11 to the coolant liquid, partly coolant liquid can flow in first communicating pipe 82, the coolant liquid that flows in first communicating pipe 82 can cool off machine oil.

Meanwhile, the oil cooler 40 may be communicated with one of the communication ports 24 of the second thermostat 22, the cooling system 100 may further include a third communication pipe 84, one end of the third communication pipe 84 may be communicated with the liquid outlet end of the oil cooler 40, the other end of the third communication pipe 84 may be communicated with the communication port 24 of the second thermostat 22, the coolant in the oil cooler 40 may flow toward the second thermostat 22 through the third communication pipe 84, the coolant that has cooled the oil cooler 40 may flow into the second mixing chamber 26 from the communication port 24 of the second thermostat 22 corresponding to the oil cooler 40, the coolant that flows into the second mixing chamber 26 from the oil cooler 40 may be mixed with the coolant in the second mixing chamber 26 and then flow toward the electronic water pump 10, so as to achieve a technical effect of cooling the coolant circulating between the oil cooler 40 and the electronic water pump 10.

In some embodiments of the present invention, as shown in fig. 1 and 7, the cooling system 100 may further include: an EGR (Exhaust Gas Re-circulation-Exhaust Gas recirculation) cooler, the EGR cooler 50 may be in communication with both the water pump outlet 11 and the second thermostat 22, respectively. The EGR can collect the waste gas generated after combustion in the combustion chamber and then recharge the waste gas into the combustion chamber so as to reduce the highest combustion temperature of the mixed gas in the combustion chamber, thereby reducing the content of nitrogen oxides in the waste gas generated in the combustion chamber. The EGR cooler 50 can recover the waste heat of the exhaust gas in the EGR, and the EGR cooler 50 can improve the energy utilization of the fuel to further improve the fuel economy of the vehicle. Also, a second communication pipe 83 may be provided on the water intake manifold 81, the oil cooler 40 may communicate with the second communication pipe 83 to communicate the oil cooler 40 with the water pump outlet 11, a part of the coolant may flow into the second communication pipe 83 after the coolant is pumped out from the water pump outlet 11, and the coolant flowing into the second communication pipe 83 may cool the EGR cooler 50.

Meanwhile, the EGR cooler 50 may communicate with one of the communication ports 24 of the second thermostat 22, the coolant that has cooled the EGR cooler 50 may flow into the second mixing chamber 26 from the communication port 24 of the second thermostat 22 corresponding to the EGR cooler 50, and the coolant that flows into the second mixing chamber 26 from the EGR cooler 50 may be mixed with the coolant in the second mixing chamber 26 and then flow to the electronic water pump 10, so that a technical effect of circulating and cooling the coolant between the oil cooler 40 and the electronic water pump 10 is achieved.

In some embodiments of the present invention, as shown in fig. 1 and 7, the cooling system 100 may further include: the warm air 60, the warm air 60 may be in series between the EGR cooler 50 and the second thermostat 22, and the warm air 60 may be in communication with both the EGR cooler 50 and the second thermostat 22, respectively. Wherein, warm braw 60 can be used for in order to improve the riding comfort of vehicle for the carriage heating, warm braw 60 can be provided with the feed liquor end and goes out the liquid end, cooling system 100 can also include fourth communicating pipe 85, the one end of fourth communicating pipe 85 can communicate with the play liquid end of EGR cooler 50, the feed liquor end intercommunication on warm braw 60 can be held in the other end of fourth communicating pipe 85, coolant in the EGR cooler 50 can flow to warm braw 60 through fourth communicating pipe 85.

Further, the cooling system 100 may further include a fifth communication pipe 86, one end of the fifth communication pipe 86 may be communicated with the liquid outlet end of the warm air 60, the other end of the fifth communication pipe 86 may be communicated with one of the communication ports 24 of the second thermostat 22, and the cooling liquid in the warm air 60 may flow to the second thermostat 22 through the fifth communication pipe 86. After the coolant cools the EGR cooler 50, the coolant may sequentially enter the warm air 60 through the liquid outlet end of the EGR cooler 50, the fourth communicating pipe 85 and the liquid inlet end of the warm air 60, the heat recovered from the EGR cooler 50 by the coolant may heat the air in the warm air 60, and the warm air 60 may provide the warm air 60 to the compartment, so that the cooling system 100 may more effectively utilize the waste heat in the exhaust gas generated by the engine, the fuel utilization rate of the vehicle may be improved, and further the fuel economy of the vehicle may be further improved.

In some embodiments of the present invention, the cooling system 100 may further comprise: the expansion kettle 70 is communicated with the cylinder cover upper layer water jacket 220 through a first exhaust pipe 71, and the expansion kettle 70 is further communicated with the radiator 30 through a second exhaust pipe 72. Wherein, can store the coolant liquid in the expansion kettle 70, the inside of expansion kettle 70 can communicate with external environment, when there is the bubble in the fluid circuit of cooling system 100, in the in-process that the coolant liquid promoted the bubble to flow to first thermostat 21 from cylinder cap upper water jacket 220, the bubble can get into in the first blast pipe 71 when passing through first blast pipe 71, the bubble can remove to expansion kettle 70 through first blast pipe 71, the air in the bubble can be in the liquid level department separation to the air in expansion kettle 70, and the air can be discharged to external environment in the expansion kettle 70, thereby can avoid the bubble to influence cooling system 100's radiating efficiency.

Similarly, when there is air bubble in the fluid loop of the cooling system 100, in the process that the coolant pushes the air bubble to flow from the first thermostat 21 to the radiator 30, the air bubble may enter the second exhaust pipe 72 when passing through the second exhaust pipe 72, the air bubble may move to the expansion tank 70 through the second exhaust pipe 72, the air in the air bubble may be separated into the air at the liquid level inside the expansion tank 70, and the air may be discharged from the expansion tank 70 to the external environment, so as to avoid the air bubble from affecting the heat dissipation efficiency of the cooling system 100.

In some embodiments of the present invention, as shown in fig. 1 and 7, the expansion tank 70 may also be in communication with the second thermostat 22 via a liquid supplement pipe 73. When the amount of the cooling liquid in the cooling system 100 is reduced, the pressure of the cooling system 100 is reduced, the pressure in the pipeline of the cooling system 100 is lower than the pressure in the expansion water tank 70, and the cooling liquid in the expansion water tank 70 can be supplemented into the cooling system 100 from the liquid supplementing pipe 73, so that the stable operation of the cooling system 100 can be ensured. When the pressure of the cooling system 100 increases due to the temperature rise of the cooling system 100, the pressure in the pipe of the cooling system 100 is higher than the pressure in the expansion tank 70, and the coolant in the cooling system 100 can also flow into the expansion tank 70 through the liquid supplement pipe 73, so as to avoid the pipe of the cooling system 100 from being damaged due to the excessive pressure of the cooling system 100.

In some embodiments of the present invention, as shown in fig. 4 and 5, the two liquid outlets disposed on the cylinder head lower layer water jacket 210 may be a first connection port and a second connection port 240, respectively, the cylinder head lower layer water jacket 210 is communicated with the cylinder head upper layer water jacket 220 through the first connection port, the cylinder head lower layer water jacket 210 is communicated with the cylinder block water jacket 230 through the second connection port 240, the area of the first connection port is larger than the area of the second connection port 240, the second connection port 240 may be disposed close to 1 cylinder of the engine, and by making the area of the first connection port unequal to the area of the second connection port 240, the flow rate of the coolant flowing into the cylinder block water jacket 230 and the flow rate of the coolant flowing into the cylinder head upper layer water jacket 220 may be different.

Preferably, assuming that the flow rate of the coolant flowing into the water jacket inlet is a, the flow rate of the coolant flowing into the cylinder block water jacket 230 is B, and the flow rate of the coolant flowing into the cylinder head upper layer water jacket 220 is C, the following relation is satisfied: b is 0.2A, C is 0.8A, that is, most of the coolant can flow into the cylinder head upper water jacket 220 from the cylinder head lower water jacket 210, a small part of the coolant can flow into the cylinder body water jacket 230 from the cylinder head lower water jacket 210, the coolant obtained by the cylinder body water jacket 230 is less than the coolant obtained by the cylinder head upper water jacket 220, so that the problem that the friction loss of each component in the cylinder body is serious due to too low cylinder body temperature can be avoided, the cooling effect of the cylinder head upper layer can be improved to avoid engine knocking or engine oil coking, the working efficiency of the engine can be improved, the cooling requirements of the engine cylinder body and the cylinder head can be met, and the working performance of the engine can be improved.

Further, the partition plate 250 may be provided with a connection hole 260 penetrating through the partition plate 250 to connect the block upper water jacket 231 and the block lower water jacket 232 in series, wherein after the coolant enters the block upper water jacket 231 from the second connection port 240, the coolant may flow along the first block flow path to the connection hole 260 on the partition plate 250, the block upper may be cooled while the coolant flows along the first block flow path, the temperature of the block upper may be lowered, and thus, the block may be prevented from being burst by heat, and when the coolant flows to the connection hole 260 on the partition plate 250, the coolant may flow into the block lower water jacket 232 to cool the block lower.

Further, as shown in fig. 6, the depth of the cylinder upper-layer water jacket 231 is H1, the depth of the cylinder lower-layer water jacket 232 is H2, and the following relation is satisfied: h1 < H2. Wherein, in the process of engine operation, the temperature of cylinder body upper strata is higher than the temperature of cylinder body lower floor, and the cooling demand of cylinder body upper strata relative cylinder body lower floor to cooling system 100 is higher, through making the degree of depth of cylinder body upper strata water jacket 231 be less than the degree of depth of cylinder body lower floor water jacket 232, can make the velocity of flow of coolant liquid in cylinder body upper strata water jacket 231 be greater than the velocity of flow of coolant liquid in cylinder body lower floor water jacket 232, can avoid cylinder body lower floor temperature low excessively to cause each part friction loss in the cylinder body serious, also can improve the cooling effect of cylinder body upper strata and avoid engine knock or machine oil coking, thereby can promote the work efficiency of engine, also can satisfy the cooling demand of the different regions of engine cylinder body, and then can improve the working property of engine. Preferably, the depth of the block upper-layer water jacket 231 and the depth of the block lower-layer water jacket 232 satisfy the relation: the arrangement of H2-3H 1 can make the partition between the upper cylinder layer and the lower cylinder layer more appropriate, and can meet the flow speed requirement of the cooling liquid in the upper cylinder layer water jacket 231 and the flow speed requirement of the cooling liquid in the lower cylinder layer water jacket 232, so that the cooling performance of the cooling system 100 can be better, and the running efficiency of the engine can be higher.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, which is intended to cover any modifications, equivalents, improvements, etc. within the spirit and scope of the present invention.

Claims

1. An engine cooling system (100), characterized in that the cooling system (100) comprises:

a cylinder cover lower layer water jacket (210);

an upper layer water jacket (220) of the cylinder cover;

the cylinder cover lower-layer water jacket (210) is respectively communicated with the cylinder cover upper-layer water jacket (220) and the cylinder body water jacket (230), a partition plate (250) is arranged in the cylinder body water jacket (230), and the partition plate (250) divides the cylinder body water jacket (230) into a cylinder body upper-layer water jacket (231) and a cylinder body lower-layer water jacket (232) which are communicated in series;

the electronic water pump (10), the electronic water pump (10) has a water pump inlet and a water pump outlet (11), the water pump outlet (11) is communicated with the cylinder cover lower layer water jacket (210);

the thermostat module assembly (20), the thermostat module assembly (20) is respectively communicated with the cylinder cover upper layer water jacket (220), the cylinder body lower layer water jacket (232) and the water pump inlet;

a heat sink (30), the heat sink (30) in communication with the thermostat module assembly (20).

2. The cooling system (100) of the engine according to claim 1, wherein the thermostat module assembly (20) includes a first thermostat (21) and a second thermostat (22), a bypass water path (23) is connected between the first thermostat (21) and the second thermostat (22), the bypass water path (23) selectively communicates the first thermostat (21) and the second thermostat (22), the first thermostat (21) communicates with the head upper water jacket (220) and the block lower water jacket (232), respectively, and the second thermostat (22) communicates with the water pump inlet;

the radiator (30) is respectively communicated with the first thermostat (21) and the second thermostat (22).

3. The cooling system (100) of an engine according to claim 2, characterized in that the cooling system (100) further comprises: and the oil cooler (40), the oil cooler (40) is respectively communicated with the water pump outlet (11) and the second thermostat (22).

4. The cooling system (100) of an engine according to claim 3, characterized in that the cooling system (100) further comprises: an EGR cooler (50), wherein the EGR cooler (50) is respectively communicated with the water pump outlet (11) and the second thermostat (22).

5. The cooling system (100) of the engine according to claim 4, characterized in that the cooling system (100) further comprises: the warm air (60) is connected between the EGR cooler (50) and the second thermostat (22) in series, and the warm air (60) is communicated with the EGR cooler (50) and the second thermostat (22) respectively.

6. The cooling system (100) of an engine according to claim 2, characterized in that the cooling system (100) further comprises: the expansion kettle (70) is communicated with the upper water jacket (220) of the cylinder cover through a first exhaust pipe (71), the expansion kettle (70) is further communicated with the radiator (30) through a second exhaust pipe (72), and the expansion kettle (70) is further communicated with the second thermostat (22) through a liquid supplementing pipe (73).

7. The cooling system (100) of an engine according to claim 4, wherein the water pump outlet (11) and the head-under water jacket (210) communicate through a water intake manifold (81), the water intake manifold (81) communicates with the EGR cooler (50) through a first communication pipe (82), and the water intake manifold (81) communicates with the oil cooler (40) through a second communication pipe (83).

8. The cooling system (100) of the engine according to claim 7, characterized in that the oil cooler (40) communicates with the second thermostat (22) through a third communicating pipe (84).

9. The cooling system (100) of the engine according to claim 5, characterized in that the warm air (60) is communicated with the EGR cooler (50) through a fourth communication pipe (85), and the warm air (60) is communicated with the second thermostat (22) through a fifth communication pipe (86);

the first thermostat (21) is communicated with the cylinder cover upper-layer water jacket (220) through a sixth communication pipe (87), the first thermostat (21) is further communicated with a radiator inlet of the radiator (30) through a seventh communication pipe (88), and the first thermostat (21) is further communicated with the cylinder body lower-layer water jacket (232) through an eighth communication pipe (89);

and the radiator outlet of the radiator (30) is communicated with the second thermostat (22) through a ninth communicating pipe (810).

10. The cooling system (100) of the engine according to any one of claims 1 to 9, wherein the head-under water jacket (210) communicates with the head-over water jacket (220) through a first connection port, the head-under water jacket (210) communicates with the block water jacket (230) through a second connection port (240), and an area of the first connection port is larger than an area of the second connection port (240);

the partition plate (250) is provided with a connecting hole (260) penetrating through the partition plate (250) so as to connect the cylinder body upper-layer water jacket (231) and the cylinder body lower-layer water jacket (232) in series;

the depth of the cylinder body upper-layer water jacket (231) is H1, the depth of the cylinder body lower-layer water jacket (232) is H2, and the relation is satisfied: h1 < H2.