Engine cooling system and vehicle

Abstract

The utility model provides an engine cooling system and a vehicle, the engine cooling system comprises a first cooling liquid loop, a second cooling liquid loop and a first gas overflow pipeline, the first cooling liquid loop is internally provided with a thermostat and an engine which are connected through a first pipeline; a radiator and an engine which are connected through a second pipeline are arranged in the second cooling liquid loop, one end of the first gas overflow pipeline communicates with an exhaust port of the thermostat, and the other end of the first gas overflow pipeline communicates with the upper portion of the radiator, so that fluid in the first cooling liquid loop and / or the second cooling liquid loop can flow to the upper portion of the radiator through the first gas overflow pipeline. According to the engine cooling system, by additionally arranging the first gas overflow pipeline, the continuous degassing function can be achieved, the number of filling intervals of cooling liquid can be reduced, the operation time and cost are saved, the degassing capacity of the engine cooling system can be improved, and the overheating phenomenon of an engine can be effectively prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of engine cooling, and in particular to an engine cooling system. Meanwhile, the utility model also relates to a vehicle provided with the engine cooling system. Background Art

[0002] In existing vehicles, the engine is the driving device for the vehicle to move. Its performance and working environment directly affect the safety of the vehicle. In order to ensure that the engine works at the most suitable temperature, an engine cooling system is generally equipped to dissipate part of the heat absorbed by the heated parts in time.

[0003] The existing engine cooling system includes an overflow tank, a radiator, and a thermostat, among which the overflow tank is often designed as a non-pressure overflow tank and equipped with an exhaust hose from the pressure cap of the radiator to the overflow tank. Although this structure can solve the problem of engine overheating caused by bubbles in the coolant to a certain extent, it still has some shortcomings.

[0004] For example, the thermostat is a valve that controls the flow path of the coolant. We also call it a "water tank". Its function is to open or close the valves of the large and small circulation channels according to the water temperature, and control the engine coolant to flow in a large or small circulation. The thermostat is an automatic temperature control device, usually containing a temperature sensing component, which uses thermal expansion or contraction to open and close the flow of air, gas or liquid. However, in an engine cooling system that uses a thermostat, the coolant will only flow through the radiator when the thermostat is opened, so the degassing operation will begin.

[0005] In addition, when the coolant in the engine cooling system is first filled, the coolant often carries air into the coolant flow space of the engine cooling system. It is difficult for pure coolant to fill 90% of the coolant flow space. The coolant containing air circulates in the coolant flow space, which will have an adverse effect on the cooling effect. If the coolant is not fully filled, the interval between coolant filling will become shorter, and the frequency of coolant filling will be high.

[0006] In addition, since the coolant flow space has a complex structure, including the space inside the engine's cooling water jacket and the space inside the radiator, when the coolant is filled for the first time, usually after the coolant is filled for the first time, the engine is started and operated for a while to allow the coolant to circulate for a certain period of time so that the coolant can be fully filled into the coolant flow space, and then filled again and the engine is started again. This operation needs to be repeated many times, the coolant filling times are frequent, the coolant filling workers have a long operation time, and the labor cost is high. Utility Model Content

[0007] In view of this, the utility model aims to provide an engine cooling system to improve the exhaust performance of the engine.

[0008] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0009] An engine cooling system comprises a first coolant circuit, a second coolant circuit and a first overflow pipe; wherein:

[0010] The first coolant circuit has a thermostat and an engine connected by a first pipeline;

[0011] The second coolant circuit has a radiator and the engine connected by a second pipeline;

[0012] One end of the first overflow pipe is connected to the exhaust port of the thermostat, and the other end is connected to the upper part of the radiator, so that the fluid in the first coolant circuit and / or the second coolant circuit can flow to the upper part of the radiator through the first overflow pipe.

[0013] Furthermore, it also includes a first overflow tank and a second overflow pipeline;

[0014] A pressure cover is provided on the upper portion of the radiator;

[0015] One end of the second overflow pipeline is connected to the pressure cap, and the other end is connected to the first overflow tank, so that the fluid flowing through the radiator can flow to the first overflow tank through the second overflow pipeline;

[0016] The first overflow tank is a non-pressure overflow tank.

[0017] Furthermore, it also includes a second overflow tank and a third overflow pipeline;

[0018] One end of the third overflow pipeline is connected to the upper part of the radiator, and the other end is connected to the second overflow tank, so that the fluid flowing through the radiator can flow to the second overflow tank through the third overflow pipeline;

[0019] The second overflow tank is a pressure-bearing overflow tank.

[0020] Furthermore, it also includes a fourth overflow pipeline;

[0021] One end of the fourth overflow pipe is connected to the cooling mechanism in the engine, and the other end is connected to the upper part of the radiator, so that the fluid flowing through the cooling mechanism can flow to the upper part of the radiator through the fourth overflow pipe.

[0022] Further, it also includes a coolant drive device;

[0023] The coolant driving device is connected in series to the first coolant circuit; and / or, the coolant driving device is connected in series to the second coolant circuit.

[0024] Furthermore, a throttle valve is provided in the first overflow pipeline to control the flow rate of the fluid flowing through the first overflow pipeline.

[0025] Furthermore, a first flow channel is provided in the thermostat, the first flow channel is serially connected to the first coolant circuit, and the exhaust port is located at the top of the first flow channel;

[0026] The first overflow pipe is a pipe with an upward gradient, and the first overflow pipe is used to make the fluid flow from the thermostat to the upper part of the radiator from low to high.

[0027] Furthermore, a second flow channel is provided in the thermostat, and the second flow channel is connected in series in the second coolant circuit. A control valve is provided in the second flow channel, and the control valve is used to open the second flow channel when the temperature of the fluid flowing through the first coolant circuit is greater than or equal to a preset temperature threshold, and close the second flow channel when the temperature of the fluid flowing through the first coolant circuit is less than the preset temperature threshold.

[0028] Furthermore, the control valve is provided with an exhaust channel, the exhaust channel is serially connected to the second coolant circuit, and the communication area of ​​the exhaust channel is smaller than the communication area of ​​the second flow channel;

[0029] An exhaust control unit is provided in the exhaust channel, and the exhaust control unit is used to connect the exhaust channel when the pressure in the first coolant circuit is greater than or equal to a preset pressure threshold, and to close the exhaust channel when the pressure in the first coolant circuit is less than the preset pressure threshold.

[0030] Compared with the prior art, the utility model has the following advantages:

[0031] The engine cooling system described in the utility model can realize a continuous degassing function by adding a first overflow pipeline, which can reduce the number of coolant filling intervals, save operation time and reduce labor costs, and can also improve the degassing capacity of the engine cooling system, effectively preventing the occurrence of engine overheating.

[0032] In addition, by setting the first overflow tank as a non-pressure overflow tank and providing a second overflow pipeline, the fluid flowing through the radiator can flow to the first overflow tank through the second overflow pipeline, which can further improve the degassing performance. If the second overflow tank is set as a pressure overflow tank, the pressure cover on the top of the radiator can be omitted, and a third overflow pipeline is provided, so that the fluid flowing through the radiator can flow to the second overflow tank through the third overflow pipeline, which also has the effect of further improving the degassing performance.

[0033] In addition, the fourth overflow pipe is provided to facilitate the fluid flowing through the cooling mechanism to flow to the upper part of the radiator through the fourth overflow pipe, and has a good degassing effect for both the first coolant circuit and the second coolant circuit.

[0034] The coolant drive device can be provided with a simplified structure, or it can be provided in the first coolant circuit and the second coolant circuit respectively, so as to facilitate the smooth circulation of the coolant. The throttle valve provided is conducive to controlling the flow of the fluid flowing through the first overflow pipe, so as to facilitate the smooth initial filling of the coolant in the first coolant circuit, and can ensure the smooth circulation of the coolant in the first coolant circuit, and can prevent the coolant from being diverted when the engine is hot, affecting the warm-up effect. The first overflow pipe is used to make the fluid flow from the thermostat to the upper part of the radiator from low to high, and has a good degassing effect.

[0035] At the same time, a second flow channel and a control valve are provided in the thermostat, which facilitates the coolant flowing through the engine to flow through the first coolant circuit and the second coolant circuit at the same time, and facilitates the automatic opening and closing of the second coolant circuit. The exhaust channel and the exhaust control unit provided can exhaust air through the exhaust control unit when the pressure in the first coolant circuit is relatively high, so that a certain exhaust effect can be achieved when the second coolant circuit is disconnected and only the coolant circulates in the first coolant circuit.

[0036] Another object of the present invention is to provide a vehicle, wherein the vehicle is provided with the engine cooling system as described above.

[0037] The vehicle described in the utility model can effectively prevent the occurrence of engine overheating by applying the aforementioned engine cooling system, thereby helping to improve the safety of vehicle driving, and can also reduce the frequency of coolant filling and have a better exhaust effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0039] Figure 1 A schematic diagram of the structure of the engine cooling system according to the first embodiment of the utility model;

[0040] Figure 2 This is a structural schematic diagram of the thermostat according to the first embodiment of the utility model;

[0041] Figure 3 This is a front view of the thermostat described in Embodiment 1 of the present utility model;

[0042] Figure 4 for Figure 3 A cross-sectional view along the AA direction;

[0043] Figure 5 This is another structural schematic diagram of the engine cooling system described in Example 1 of the utility model.

[0044] Description of reference numerals:

[0045] 1. First overflow tank; 2. First pipeline; 3. Second pipeline; 4. Coolant drive device; 5. Engine; 6. Thermostat; 601. Second flow channel; 602. Control valve; 603. Exhaust channel; 604. Exhaust control unit; 605. Auxiliary overflow port; 7. First overflow pipeline; 8. Throttle valve; 9. Radiator; 901. Pressure cap; 10. Second overflow pipeline; 11. Second overflow tank; 12. Third overflow pipeline; 13. Fourth overflow pipeline. DETAILED DESCRIPTION

[0046] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0047] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "back" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0048] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installation", "connection", "connection", and "connector" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0049] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0050] Embodiment 1

[0051] The present embodiment relates to an engine cooling system, specifically to a technical solution that can continuously degas and reduce the number of coolant filling intervals. The improved exhaust method in the engine cooling system can effectively solve the problems existing in the traditional cooling system, improve the stability and efficiency of the cooling system, and thus ensure the good operation of the engine 5.

[0052] Based on the above design concept, an exemplary structure of the engine cooling system of this embodiment is as follows: Figure 1 As shown, it mainly includes a first coolant circuit, a second coolant circuit and a first overflow pipe 7. The first coolant circuit has a thermostat 6 and an engine 5 connected through a first pipe 2, and the second coolant circuit has a radiator 9 and an engine 5 connected through a second pipe 3. One end of the first overflow pipe 7 is connected to the exhaust port of the thermostat 6, and the other end is connected to the upper part of the radiator 9, so that the fluid in the first coolant circuit and / or the second coolant circuit can flow to the upper part of the radiator 9 through the first overflow pipe 7.

[0053] In order to better understand this embodiment, it should be noted that the first pipeline 2 and the second pipeline 3 are not just one, but several. The first pipeline 2 is used to connect all the components in the first coolant circuit in series, so that the coolant can circulate in the first coolant circuit. The second pipeline 3 is used to connect all the components in the second coolant circuit in series, so that the coolant can circulate in the second coolant circuit. In other words, the components in the first coolant circuit and the second coolant circuit, except Figure 1 and Figure 5 The components shown can also be set with reference to the existing structure.

[0054] In addition, the engine cooling system generally includes a small circulation loop and a large circulation loop. In this embodiment, the small circulation loop is the first coolant loop, which refers to the circulation flow path of the coolant when the coolant does not flow through the radiator 9, and the large circulation loop is the second coolant loop, which refers to the circulation flow path of the coolant when the coolant flows through the radiator 9.

[0055] Ginseng Figure 1 As shown, the conventional cooling system is not provided with the first overflow pipe 7, and relies on the radiator 9 and the pressure cap 901 to control the pressure of the coolant. When the coolant temperature rises, the system pressure increases, exceeding the pressure-maintaining capacity of the pressure cap 901, causing the coolant to be discharged through the overflow port on the pressure cap 901 and stored in the first overflow tank. As the coolant temperature decreases, a vacuum is generated in the cooling system, and the coolant is drawn back from the first overflow tank.

[0056] Furthermore, before the thermostat 6 opens, especially during long idling or WOT (Wide Open Throttle) cycles, i.e. full throttle acceleration, the cooling system may overheat due to the air and exhaust gas entrained inside the engine 5 penetrating into the cooling water jacket. This air may be caused by insufficient coolant filling or boiling of the cylinder wall during the filling process. Therefore, continuous degassing is required to avoid such problems.

[0057] At Figure 1 In the state shown, the first coolant circuit refers to a circuit in which the coolant circulates through the engine 5, the thermostat 6, and the coolant drive device 4. The second coolant circuit refers to a circuit in which the coolant circulates through the engine 5, the thermostat 6, the radiator 9, and the coolant drive device 4.

[0058] As a preferred embodiment, the engine cooling system further includes a first overflow tank 1 and a second overflow pipe 10. Figure 1 As shown, a pressure cap 901 is provided on the upper portion of the radiator 9, one end of the second overflow pipe 10 is connected to the pressure cap 901, and the other end is connected to the first overflow tank 1, so that the fluid flowing through the radiator 9 can flow to the first overflow tank 1 through the second overflow pipe 10, and the first overflow tank 1 is a non-pressure overflow tank.

[0059] Here, by setting the first overflow tank 1 as a non-pressure overflow tank and providing a second overflow pipe 10, the fluid flowing through the radiator 9 can flow to the first overflow tank 1 through the second overflow pipe 10, which can further improve the degassing performance.

[0060] like Figure 5 As shown, the engine cooling system also includes a second overflow tank 11 and a third overflow pipe 12, wherein one end of the third overflow pipe 12 is connected to the upper part of the radiator 9, which is preferably connected to the highest point of the flow space in the radiator 9, and the other end is connected to the second overflow tank 11, so that the fluid flowing through the radiator 9 can flow to the second overflow tank 11 through the third overflow pipe 12, and the second overflow tank 11 is a pressure-bearing overflow tank.

[0061] In this structure, the second overflow tank 11 is configured as a pressure-bearing overflow tank, and the pressure cover 901 on the top of the radiator 9 can be omitted. At the same time, a third overflow pipe 12 is provided, so that the fluid flowing through the radiator 9 can flow to the second overflow tank 11 through the third overflow pipe 12, which also has the effect of further improving the degassing performance.

[0062] It should be noted here that Figure 1 and Figure 5 The main difference is that Figure 1 The first overflow tank 1 is a non-pressure overflow tank, so the upper part of the radiator 9 needs to be equipped with a pressure cover 901. Figure 5The second overflow tank 11 is a pressure-bearing overflow tank, so the upper part of the radiator 9 does not need to be equipped with a pressure cover 901.

[0063] In addition, the first coolant circuit and the second coolant circuit as above may be Figure 1 and Figure 5 However, as long as the first coolant circuit includes the engine 5 and the thermostat 6, and the second coolant circuit includes the engine 5 and the radiator 9, the engine cooling system is within the protection scope of the present utility model.

[0064] As a preferred embodiment, the engine cooling system of this embodiment further includes a fourth overflow pipe 13, wherein one end of the fourth overflow pipe 13 is communicated with a cooling mechanism such as a cooling water jacket in the engine 5, and the other end is communicated with the upper part of the radiator 9, so that the fluid flowing through the cooling mechanism can flow to the upper part of the radiator 9 through the fourth overflow pipe 13. Here, the cooling mechanism in the engine 5 can be, for example, an existing cooling water jacket.

[0065] Here, the fourth overflow pipe 13 is provided, which is beneficial for the fluid flowing through the cooling mechanism to flow to the upper part of the radiator 9 through the fourth overflow pipe 13, and has a good degassing effect for both the first coolant circuit and the second coolant circuit.

[0066] Figure 5 The engine cooling system shown in FIG. 1 adopts a pressure overflow tank, and is provided with a fourth overflow pipe 13 for exhausting the cooling water jacket of the engine 5, and a third overflow pipe 12 for exhausting the radiator 9. Figure 1 The engine cooling system shown, Figure 5 The structure shown is overall heavy, bulky, difficult to arrange, and relatively costly.

[0067] As a preferred embodiment, still refer to Figure 1 As shown, the engine cooling system in this embodiment also includes a coolant driving device 4, which can adopt an existing water pump, for example. The coolant driving device 4 is connected in series in the first coolant circuit. In this way, when the thermostat 6 is closed, the first coolant circuit is connected, and when the thermostat 6 is opened, the second coolant circuit is connected. The coolant driving device 4 can be used to drive the circulation of the fluid in the first coolant circuit, and can also be used to drive the circulation of the fluid in the second coolant circuit, so the structure can be simplified.

[0068] It should be noted here that, in other embodiments, the coolant driving device 4 can also be connected in series in the second coolant circuit, or the coolant driving device 4 can also be respectively arranged in the first coolant circuit and the second coolant circuit to facilitate the smooth circulation of the coolant.

[0069] As a preferred embodiment, refer to Figure 1 or Figure 5 As shown, a throttle valve 8 is provided in the first overflow pipe 7 to control the flow rate of the fluid flowing through the first overflow pipe 7. The throttle valve 8 provided here is conducive to controlling the flow rate of the fluid flowing through the first overflow pipe 7, thereby facilitating the initial filling of the coolant in the first coolant circuit to be relatively smooth, and ensuring the smooth circulation of the coolant in the first coolant circuit.

[0070] As a preferred embodiment, the first overflow pipe 7 is a pipe with an upward gradient, which is used to make the fluid flow from the thermostat 6 to the upper part of the radiator 9 from low to high. That is, when the first overflow pipe 7 is actually set, it should extend from low to high, and may have a horizontal section, but should not have a descending section. Such a setting can make the fluid flow smoothly to the radiator 9 and has a better degassing effect.

[0071] Specifically, if Figures 2 to 4 As shown in FIG. 1 , as a preferred embodiment, a second flow channel 601 is provided in the thermostat 6, and the second flow channel 601 is connected in series to the second coolant circuit. Figure 4 As shown, the first section, i.e. the left end, of the second flow channel 601 can flow to the second coolant circuit. In this embodiment, it directly flows to the radiator 9.

[0072] Preferably, a control valve 602 is provided in the second flow channel 601, and the control valve 602 is used to open the second flow channel 601 when the temperature of the fluid flowing through the first coolant circuit is greater than or equal to a preset temperature threshold, and to close the second flow channel 601 when the temperature of the fluid flowing through the first coolant circuit is less than the preset temperature threshold, so as to facilitate the coolant flowing through the engine 5 to flow through the first coolant circuit and the second coolant circuit at the same time, and to facilitate automatic opening and closing of the second coolant circuit.

[0073] As a preferred embodiment, the control valve 602 is provided with an exhaust channel 603, which is connected in series in the second coolant circuit, and the communication area of ​​the exhaust channel 603 is smaller than the communication area of ​​the second flow channel 601. An exhaust control unit 604 is provided in the exhaust channel 603, and the exhaust control unit 604 can adopt an existing micro-pin structure, which is used to connect the exhaust channel 603 when the pressure in the first coolant circuit is greater than or equal to the preset pressure threshold, and close the exhaust channel 603 when the pressure in the first coolant circuit is less than the preset pressure threshold.

[0074] As shown in the above structure, the exhaust channel 603 and the exhaust control unit 604 are set, and when the pressure in the first coolant circuit is relatively high, the exhaust can be exhausted through the exhaust control unit 604. Therefore, when the second coolant circuit is disconnected and only the coolant circulates in the first coolant circuit, a certain exhaust effect can be achieved.

[0075] It should be additionally explained here that the thermostat 6 preferably adopts the existing structure, and the control valve 602, the second flow channel 601 and the exhaust channel 603 inside it all preferably adopt the existing structure.

[0076] In addition, a first flow channel is also provided in the thermostat 6, and the first flow channel is connected in series to the first coolant circuit. The exhaust port in this embodiment is preferably located at the top of the first flow channel, that is, the highest point of the first flow channel. Figure 4 In the state shown, the first end of the first flow channel, i.e., the right end, is connected to the inlet of the coolant driving device 4, and the second ends of the first flow channel and the second flow channel are connected in parallel and connected to the outlet of the cooling water jacket of the engine 5.

[0077] It should also be noted that, in the present embodiment, an auxiliary overflow port 605 needs to be added to the existing thermostat 6. The specific location of the auxiliary overflow port 605 is related to whether the first coolant circuit flows to the upper part of the radiator 9 through the first overflow pipe 7, or the fluid in the second coolant circuit can flow to the upper part of the radiator 9 through the first overflow pipe 7, or both flow to the upper part of the radiator 9 through the first overflow pipe 7 at the same time.

[0078] As in the present embodiment, the auxiliary overflow port 605 is directly connected to the second flow channel 601, and it can be set at the highest point of the second flow channel 601, for example, so that it has an exhaust effect only when the coolant circulates in the second coolant circuit. If the auxiliary overflow port 605 is directly connected to the first flow channel, it can be set at the highest point of the first flow channel as described above, and it has an exhaust effect when the coolant circulates in the first coolant circuit and the second coolant circuit. In this way, whether it is the initial filling of the coolant, the idling condition, or the condition where the thermostat 6 is closed or opened, the bubbles will continue to move to the radiator 9, thereby effectively preventing the engine 5 from overheating.

[0079] In this embodiment, Figures 2 to 4 As shown, an auxiliary overflow port 605 is added to the first flow channel of the thermostat 6. The auxiliary overflow port 605 is located between the thermostat 6 and the neck of the water inlet of the radiator 9 and at the highest point of the engine 5. This can facilitate continuous exhaust operation of the engine 5, and can ensure better degassing effect regardless of the first coolant circuit or the second coolant circuit.

[0080] Finally, it should be noted that the upper part mentioned in this embodiment is preferably the top, that is, the highest point. In addition, a position close to the top is also possible.

[0081] The engine cooling system of this embodiment can realize the continuous degassing function by adding the first overflow pipe 7, which can reduce the number of coolant filling intervals, save operation time and reduce labor costs, and can also improve the degassing capacity of the engine cooling system, effectively preventing the occurrence of overheating of the engine 5.

[0082] Embodiment 2

[0083] This embodiment relates to a vehicle, on which is provided an engine cooling system as in the first embodiment.

[0084] The vehicle of this embodiment can reduce the frequency of coolant filling by applying the engine cooling system of the first embodiment, has a better exhaust effect, is conducive to the engine 5 working in a suitable environment, and can improve the safety of vehicle driving.

[0085] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An engine cooling system, characterized in that: It comprises a first cooling liquid circuit, a second cooling liquid circuit and a first overflow pipeline (7); The first coolant circuit comprises a thermostat (6) and an engine (5) connected via a first pipeline (2); The second coolant circuit comprises a radiator (9) and the engine (5) connected via a second pipeline (3); One end of the first overflow pipe (7) is connected to the exhaust port of the thermostat (6), and the other end is connected to the upper part of the radiator (9), so that the fluid in the first coolant circuit and / or the second coolant circuit can flow to the upper part of the radiator (9) through the first overflow pipe (7).

2. The engine cooling system according to claim 1, characterized in that: It also includes a first overflow tank (1) and a second overflow pipeline (10); A pressure cover (901) is provided on the upper part of the radiator (9); One end of the second overflow pipe (10) is in communication with the pressure cap (901), and the other end is in communication with the first overflow tank (1), so that the fluid flowing through the radiator (9) can flow to the first overflow tank (1) through the second overflow pipe (10); The first overflow tank (1) is a non-pressure overflow tank.

3. The engine cooling system according to claim 1, characterized in that: It also includes a second overflow tank (11) and a third overflow pipeline (12); One end of the third overflow pipeline (12) is in communication with the upper portion of the radiator (9), and the other end is in communication with the second overflow tank (11), so that the fluid flowing through the radiator (9) can flow to the second overflow tank (11) through the third overflow pipeline (12); The second overflow tank (11) is a pressure-bearing overflow tank.

4. The engine cooling system according to claim 1, characterized in that: Also includes a fourth overflow pipeline (13); One end of the fourth overflow pipe (13) is connected to a cooling mechanism in the engine (5), and the other end is connected to an upper portion of the radiator (9), so that the fluid flowing through the cooling mechanism can flow to the upper portion of the radiator (9) through the fourth overflow pipe (13).

5. The engine cooling system according to claim 1, characterized in that: Also includes a coolant drive device (4); The coolant driving device (4) is connected in series to the first coolant circuit; and / or the coolant driving device (4) is connected in series to the second coolant circuit.

6. The engine cooling system according to claim 1, characterized in that: A throttle valve (8) is provided in the first overflow pipeline (7) to control the flow rate of the fluid flowing through the first overflow pipeline (7).

7. The engine cooling system according to claim 1, characterized in that: The thermostat (6) is provided with a first flow channel, the first flow channel is connected in series to the first coolant circuit, and the exhaust port is located at the top of the first flow channel; The first overflow pipe (7) is a pipe with an upward gradient, and the first overflow pipe (7) is used to allow the fluid to flow from the thermostat (6) to the upper part of the radiator (9) from low to high.

8. The engine cooling system according to any one of claims 1 to 7, characterized in that: The thermostat (6) is provided with a second flow channel (601), and the second flow channel (601) is connected in series to the second coolant circuit; A control valve (602) is provided in the second flow channel (601), and the control valve (602) is used to open the second flow channel (601) when the temperature of the fluid flowing through the first coolant circuit is greater than or equal to a preset temperature threshold, and to close the second flow channel (601) when the temperature of the fluid flowing through the first coolant circuit is less than the preset temperature threshold.

9. The engine cooling system according to claim 8, characterized in that: The control valve (602) is provided with an exhaust channel (603), the exhaust channel (603) is connected in series to the second coolant circuit, and the communication area of ​​the exhaust channel (603) is smaller than the communication area of ​​the second flow channel (601); An exhaust control unit (604) is provided in the exhaust channel (603), and the exhaust control unit (604) is used to connect the exhaust channel (603) when the pressure in the first coolant circuit is greater than or equal to a preset pressure threshold, and to close the exhaust channel (603) when the pressure in the first coolant circuit is less than the preset pressure threshold.

10. A vehicle, characterized in that: The vehicle is provided with the engine cooling system according to any one of claims 1 to 9.

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