Engine cooling system and automobile

Abstract

The present invention provides an engine cooling system and an automobile, and relates to the technical field of automobile engines. The engine cooling system comprises a water pump, a cylinder head water jacket and a cylinder body water jacket, the cylinder head water jacket is provided with a first coolant inlet and a first coolant outlet which are interconnected, the first coolant inlet is connected to the water pump, the cylinder body water jacket is provided with a second coolant inlet which is connected to the first coolant outlet, the cylinder body water jacket is provided with a second coolant outlet, and the second coolant outlet is connected to the water pump, so that the coolant from the water pump can first enter the cylinder head water jacket to cool the cylinder head, and then flow into the cylinder body water jacket to cool the engine cylinder body and then return to the water pump. The automobile comprises the above-mentioned engine cooling system. The engine cooling system is beneficial to improving the cold utilization efficiency of the coolant and reducing the impact on the engine performance.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile engines, and in particular to an engine cooling system and an automobile. Background Art

[0002] The engine cooling system has two main functions. On the one hand, it removes the excess heat generated by the engine during normal operation in a timely manner to avoid various adverse phenomena. On the other hand, when the engine is cold started, it allows the engine to reach normal operating temperature as quickly as possible (rapid warm-up) to reduce engine friction work and improve engine fuel economy.

[0003] However, in the existing engine cooling system, the coolant is directly divided into two parts after flowing out of the water pump, one part flows into the cylinder water jacket, and the other part flows into the cylinder head water jacket. This flow pattern is not conducive to improving the cooling efficiency of the coolant and affects the engine performance. Summary of the invention

[0004] The purpose of the present invention includes providing an engine cooling system and a vehicle, which are beneficial to improving the cold utilization efficiency of the coolant and reducing the impact on the engine performance.

[0005] The embodiments of the present invention can be implemented as follows:

[0006] In a first aspect, an embodiment of the present invention provides an engine cooling system, comprising a water pump, a cylinder head water jacket and a cylinder block water jacket, the cylinder head water jacket being provided with a first coolant inlet and a first coolant outlet which are interconnected, the first coolant inlet being connected to the water pump, the cylinder block water jacket being provided with a second coolant inlet which is connected to the first coolant outlet, the cylinder block water jacket being provided with a second coolant outlet, the second coolant outlet being connected to the water pump, so that the coolant from the water pump can first enter the cylinder head water jacket to cool the cylinder head, and then flow into the cylinder block water jacket to cool the engine cylinder block, and then return to the water pump.

[0007] In an optional embodiment, the cylinder head water jacket includes an upper cylinder head water jacket and a lower cylinder head water jacket, the upper cylinder head water jacket is arranged above the lower cylinder head water jacket, and the first coolant inlet and the first coolant outlet are both arranged in the lower cylinder head water jacket.

[0008] In an optional embodiment, the first coolant inlet is arranged on a side of the cylinder head lower water jacket close to the exhaust side of the engine, and the first coolant outlet is arranged on a side of the cylinder head lower water jacket close to the intake side of the engine.

[0009] In an optional embodiment, the cylinder head upper water jacket is provided with a third coolant inlet, and the cylinder head lower water jacket is provided with an interface connected to the first coolant inlet, and the third coolant inlet is connected to the interface so that a portion of the coolant entering the cylinder head lower water jacket can enter the cylinder head upper water jacket.

[0010] In an optional embodiment, the cylinder head water jacket is provided with a third coolant outlet, the third coolant outlet is connected to the third coolant inlet and the water pump at the same time, and the third coolant outlet is located on the side of the cylinder head water jacket close to the engine exhaust side.

[0011] In an optional embodiment, the third coolant outlet is connected to the second coolant outlet and then connected to the water pump.

[0012] In an optional embodiment, the engine cooling system includes an oil cooler, which is provided with a fourth coolant inlet and a fourth coolant outlet which are interconnected, the fourth coolant inlet is connected to the cylinder water jacket, and the fourth coolant outlet is connected to the second coolant outlet.

[0013] In an optional embodiment, the water pump includes an electric water pump connected to the first coolant inlet.

[0014] In an optional embodiment, the engine cooling system includes a heater core and an exhaust gas recirculation cooler, the inlet of the heater core is connected to the second coolant outlet, the outlet of the heater core is connected to the inlet of the exhaust gas recirculation cooler, and the outlet of the exhaust gas recirculation cooler is connected to the water pump.

[0015] In a second aspect, an embodiment of the present invention provides a vehicle, comprising an engine cooling system according to any one of the aforementioned embodiments.

[0016] The beneficial effects of the embodiments of the present invention include:

[0017] The engine cooling system includes a water pump, a cylinder head water jacket and a cylinder block water jacket. When the coolant flows out of the water pump, it carries enough cold energy, so that when the coolant first flows into the cylinder head water jacket, it can cool the cylinder head as much as possible, thereby taking away as much heat as possible near the cylinder head. Then, the coolant flowing out of the cylinder head water jacket enters the cylinder block water jacket to cool the cylinder block. At this time, the cold energy carried by the coolant is reduced and the heat is increased. When cooling the cylinder block, the cylinder block temperature will not be too low, which is beneficial to reduce the friction between the engine piston and the cylinder barrel and improve the engine performance. The flow of coolant in the engine cooling system makes the cold energy distribution more reasonable, and a better cooling effect can be obtained with a smaller coolant flow rate, which is beneficial to improve the cold energy utilization efficiency of the coolant, and can also reduce the impact on the engine performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 Schematic diagram of the structure of the cylinder water jacket and the cylinder head water jacket in an embodiment of the present invention;

[0020] Figure 2 It is a structural schematic diagram of a cylinder head in an embodiment of the present invention;

[0021] Figure 3 A schematic diagram of the structure of an engine cooling system in an embodiment of the present invention;

[0022] Figure 4 Schematic diagram of the flow path of the coolant in the cylinder head water jacket and the cylinder block water jacket in an embodiment of the present invention.

[0023] Icons: 100-engine cooling system; 110-water pump; 120-cylinder head water jacket; 121-first coolant inlet; 122-first coolant outlet; 123-cylinder head upper water jacket; 124-cylinder head lower water jacket; 125-third coolant inlet; 126-third coolant outlet; 127-interface; 140-cylinder water jacket; 141-second coolant inlet; 142-second coolant outlet; 144-manifold; 150-oil cooler; 151-fourth coolant inlet; 152-fourth coolant outlet; 160-heater core; 170-exhaust gas recirculation cooler; 175-supercharger; 180-thermostat; 181-radiator; 182-expansion tank; 184-bypass line. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0027] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, or is the orientation or position relationship in which the product of the invention is usually placed when used. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0028] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0029] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0030] In the existing engine cooling system of automobiles, the coolant carrying a large amount of cold water flows out of the water pump and is directly divided into two paths. One path flows through the cylinder head water jacket to cool the cylinder head, and the other path flows through the cylinder body water jacket to cool the cylinder body. The coolant that has absorbed heat can return to the water pump after releasing heat to realize the circulation of the coolant. The cylinder head water jacket and the cylinder body water jacket are coolant flow channels in the cylinder head or cylinder body. However, the cooling requirements of the engine cylinder body and the cylinder head are not exactly the same. Reducing the temperature of the cylinder head is conducive to accelerating the cooling of the engine, while if the cylinder body is overcooled, it is easy to affect the viscosity of the oil and thus increase the friction between the engine piston and the cylinder barrel. Therefore, in the existing engine cooling system, the cold utilization efficiency of the coolant is low.

[0031] To improve the above problems, please refer to Figure 1 , Figure 2 and Figure 3 The present embodiment provides a car, which includes an engine cooling system 100. The engine cooling system 100 promptly removes the excess heat generated when the engine is working normally to avoid various adverse phenomena.

[0032] The engine cooling system 100 includes a water pump 110, a cylinder head water jacket 120 and a cylinder block water jacket 140. The cylinder head water jacket 120 is provided with a first coolant inlet 121 and a first coolant outlet 122 which are connected to each other, and the first coolant inlet 121 is connected to the water pump 110. The cylinder block water jacket 140 is provided with a second coolant inlet 141 which is connected to the first coolant outlet 122, and the cylinder block water jacket 140 is provided with a second coolant outlet 142, and the second coolant outlet 142 is connected to the water pump 110, so that the coolant from the water pump 110 can first enter the cylinder head water jacket 120 to cool the cylinder head, and then flow into the cylinder block water jacket 140 to cool the engine cylinder block before returning to the water pump 110.

[0033] In this embodiment, since the engine cooling system 100 has relatively low requirements on the performance of the water pump 110, the water pump 110 includes an electric water pump, which is connected to the first coolant inlet 121. Specifically, the outlet of the water pump 110 is connected to the first coolant inlet 121, so that the coolant flowing out of the water pump 110 can enter the cylinder head water jacket 120. In other embodiments, the water pump 110 may also be a mechanical water pump 110.

[0034] In this embodiment, the cylinder head water jacket 120 includes a cylinder head upper water jacket 123 and a cylinder head lower water jacket 124. The cylinder head upper water jacket 123 is arranged above the cylinder head lower water jacket 124, and the first coolant inlet 121 and the first coolant outlet 122 are both arranged in the cylinder head lower water jacket 124. Specifically, the cylinder head lower water jacket 124 is located between the cylinder body water jacket 140 and the cylinder head upper water jacket 123. To further achieve the heat dissipation effect, the first coolant inlet 121 is arranged on the side of the cylinder head lower water jacket 124 close to the exhaust side of the engine, and the first coolant outlet 122 is arranged on the side of the cylinder head lower water jacket 124 close to the intake side of the engine. As a result, the coolant flows from the exhaust side to the intake side. The hottest area of ​​the engine is the integrated exhaust manifold and combustion chamber, so there is more waste heat on the exhaust side. If the coolant flows from the intake side to the exhaust side, the coolant will first absorb the waste heat on the intake side before cooling the exhaust side. It is impossible to achieve heat exchange with the maximum cooling capacity of the hottest area and the coolant, affecting the heat dissipation effect of the engine.

[0035] It can be understood that in other embodiments, the cylinder head water jacket 120 may not be divided into the cylinder head upper water jacket 123 and the cylinder head lower water jacket 124, and only needs to be configured according to actual needs.

[0036] Meanwhile, the cylinder head upper water jacket 123 is provided with a third coolant inlet 125 and a third coolant outlet 126. The cylinder head lower water jacket 124 is provided with an interface 127 communicating with the first coolant inlet 121, and the interface 127 is located between the first coolant inlet 121 and the first coolant outlet 122. The third coolant inlet 125 is communicated with the interface 127, so that a portion of the coolant entering the cylinder head lower water jacket 124 can enter the cylinder head upper water jacket 123. Please refer to Figure 4That is to say, in this embodiment, when the coolant flows through the cylinder head lower water jacket 124, part of the coolant flows into the cylinder body water jacket 140 from the first coolant outlet 122, and the other part of the coolant flows into the cylinder head upper water jacket 123 from the interface 127, thereby completing the cooling of the entire cylinder head. The third coolant outlet 126 is connected to the third coolant inlet 125 and the water pump 110 at the same time, and the third coolant outlet 126 is located on the side of the cylinder head upper water jacket 123 close to the engine exhaust side. In other words, the coolant flowing out of the cylinder head upper water jacket 123 eventually returns to the water pump 110. The flow distribution of the coolant entering the cylinder head upper water jacket 123 and the coolant entering the cylinder body water jacket 140 can be adjusted by setting the size of the interface 127. In this embodiment, in order to achieve a better cooling effect, the coolant entering the cylinder head upper water jacket 123 accounts for 70%, and the coolant entering the cylinder body water jacket 140 accounts for 30%.

[0037] In this embodiment, in order to save space, the third coolant outlet 126 and the second coolant outlet 142 are connected and then connected to the water pump 110. Specifically, the third coolant outlet 126 and the second coolant outlet 142 are both connected to the manifold 144, and the manifold 144 is connected to the inlet of the water pump 110. Therefore, the coolant flowing out of the cylinder head upper water jacket 123 and the coolant flowing out of the cylinder body water jacket 140 are merged together and finally returned to the water pump 110. It can be understood that in other embodiments, the third coolant outlet 126 and the second coolant outlet 142 may not be connected to each other, so that the coolant flowing out of the cylinder head upper water jacket 123 and the coolant flowing out of the cylinder body water jacket 140 are returned to the water pump 110 respectively.

[0038] The cylinder water jacket 140 is located below the cylinder head water jacket 120. The coolant enters the cylinder water jacket 140 from the second coolant inlet 141 and flows out of the cylinder water jacket 140 from the second coolant outlet 142. In this embodiment, the engine cooling system 100 further includes an oil cooler 150, which is provided with a fourth coolant inlet 151 and a fourth coolant outlet 152 that are connected to each other. The fourth coolant inlet 151 is connected to the cylinder water jacket 140, and the fourth coolant outlet 152 is connected to the second coolant outlet 142. Thus, a part of the coolant entering the cylinder water jacket 140 can enter the oil cooler 150 through the fourth coolant inlet 151 to cool the oil, and the other part passes through the cylinder water jacket 140 to cool the cylinder, and the coolant passing through the oil cooler 150 can be combined with the coolant passing through the cylinder water jacket 140 after flowing out, and finally return to the water pump 110. That is, in this embodiment, the oil cooler 150 and the cylinder water jacket 140 are similar to a parallel relationship, which can effectively reduce the performance requirements of the water pump 110. It can be understood that in other embodiments, the fourth coolant outlet 152 can also be connected to the water pump 110 instead of the second coolant outlet 142, and it only needs to be set according to actual needs.

[0039] In this embodiment, the engine cooling system 100 includes a heater core 160 and an exhaust gas recirculation cooler 170. The inlet of the heater core 160 is connected to the second coolant outlet 142. Specifically, the inlet of the heater core 160 is connected to the manifold 144, the outlet of the heater core 160 is connected to the inlet of the exhaust gas recirculation cooler 170, and the outlet of the exhaust gas recirculation cooler 170 is connected to the water pump 110. Since the coolant flowing out of the cylinder head water jacket 123 and the cylinder water jacket 140 converges together and already carries a certain amount of heat, this part of the heat can be reused in the heater core 160. Since the coolant absorbs heat better when it is upstream, a more efficient heat exchange can be performed in the heater core 160, which can provide more heat for the heater core 160, so that the heater core 160 can generate more warm air, which is not only beneficial to energy saving but also beneficial to the cooling of the coolant. The coolant after passing through the heater core 160 carries the cold energy again and enters the exhaust gas recirculation cooler 170, cooling a part of the exhaust gas discharged by the automobile for subsequent recycling, which is beneficial to improving environmental protection, thereby better realizing energy conservation and emission reduction. The outlet of the exhaust gas recirculation cooler 170 is connected to the inlet of the water pump 110, and the coolant flowing out of the exhaust gas recirculation cooler 170 eventually flows back to the water pump 110 for a new round of cooling cycle.

[0040] In addition, since the coolant flowing out of the cylinder head water jacket 120 and the cylinder body water jacket 140 still carries a certain amount of cold, in this embodiment, the manifold 144 is also connected to the inlet of the supercharger 175, so that the coolant flowing out of the cylinder head water jacket 120 and the cylinder body water jacket 140 can further cool the supercharger 175. The outlet of the supercharger 175 is connected to the inlet of the water pump 110.

[0041] In addition, in the present embodiment, the engine system further includes a thermostat 180, a radiator 181 and an expansion tank 182. The thermostat 180 has a first joint, a second joint and a third joint. The first joint is connected to the manifold 144, the second joint is connected to the radiator 181, and the third joint is connected to the inlet of the water pump 110 through the bypass line 184. When the temperature of the coolant in the manifold 144 is too high, the first joint is connected to the second joint, so that the coolant enters the radiator 181 for heat dissipation. When the temperature is not too high, the first joint is connected to the third joint, and the coolant returns to the water pump 110 through the bypass line 184. The thermostat 180 automatically adjusts the amount of water entering the radiator 181 according to the temperature of the cooling water, changes the circulation range of the water, adjusts the heat dissipation capacity of the cooling system, and ensures that the engine works within a suitable temperature range. The thermostat 180 must be kept in good technical condition, otherwise it will seriously affect the normal operation of the engine.

[0042] The inlet of the expansion tank 182 is communicated with the manifold 144, and the outlet of the expansion tank 182 is communicated with the inlet of the water pump 110. The radiator 181 is not only communicated with the water pump 110, but also communicated with the inlet of the expansion tank 182. The expansion tank 182 is used to discharge the gas generated by the thermal expansion and contraction of the coolant to maintain the normal circulation of the coolant in the entire engine cooling system 100.

[0043] The working principle and working process of the engine cooling system 100 are as follows:

[0044] Driven by the water pump 110, the coolant enters the cylinder head lower water jacket 124 from the first coolant inlet 121, and then 70% of the coolant enters the cylinder head upper water jacket 123 through the interface 127, and 30% of the coolant enters the cylinder body water jacket 140 through the first coolant outlet 122. After entering the cylinder head upper water jacket 123, the coolant flows out from the third coolant outlet 126 to the manifold 144, thereby completing the cooling of the cylinder head.

[0045] After the coolant enters the cylinder water jacket 140, a portion of the coolant enters the oil cooler 150 through the fourth coolant inlet 151, so that the oil cooler 150 cools the oil. The coolant passing through the oil cooler 150 flows out from the fourth coolant outlet 152 to the manifold 144. Therefore, all the coolants passing through the cylinder head water jacket 120 and the cylinder water jacket 140 are collected and flow out.

[0046] Part of the coolant flowing through the manifold 144 can be used to cool the supercharger 175, and part can be used to heat the heater core 160 and then cool the exhaust gas recirculation cooler 170, effectively improving energy utilization and facilitating energy conservation and emission reduction. At the same time, the radiator 181 can dissipate the heat of the coolant in time, and the expansion tank 182 can discharge the gas generated by thermal expansion and contraction in time to maintain the normal circulation of the cooling system. Finally, all the coolant flows to the inlet of the water pump 110 for the next cycle.

[0047] The engine cooling system 100 enables the coolant to flow through the cylinder head water jacket 120 first and then through the cylinder block water jacket 140. When the coolant carries the most cooling capacity, the cylinder head is cooled first, and then the cylinder block with a slightly lower cooling requirement is cooled. This can maximize the use of cooling capacity while achieving a better cooling effect, and is beneficial to improving engine performance and achieving better energy-saving effects.

[0048] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. An engine cooling system, characterized in that: It comprises a water pump, a cylinder head water jacket and a cylinder body water jacket, wherein the cylinder head water jacket is provided with a first coolant inlet and a first coolant outlet which are interconnected, the first coolant inlet is connected to the water pump, the cylinder body water jacket is provided with a second coolant inlet which is connected to the first coolant outlet, the cylinder body water jacket is provided with a second coolant outlet, the second coolant outlet is connected to the water pump, so that the coolant from the water pump can first enter the cylinder head water jacket to cool the cylinder head, then flow into the cylinder body water jacket to cool the engine cylinder body, and then return to the water pump; The cylinder head water jacket comprises an upper cylinder head water jacket and a lower cylinder head water jacket, the upper cylinder head water jacket is arranged above the lower cylinder head water jacket, and the first coolant inlet and the first coolant outlet are both arranged in the lower cylinder head water jacket; The cylinder head upper water jacket is provided with a third coolant inlet, the cylinder head lower water jacket is provided with an interface communicating with the first coolant inlet, and the third coolant inlet is communicated with the interface so that a portion of the coolant entering the cylinder head lower water jacket can enter the cylinder head upper water jacket; The engine cooling system includes an oil cooler, and the oil cooler is provided with a fourth coolant inlet and a fourth coolant outlet which are connected to each other, the fourth coolant inlet is connected to the cylinder water jacket, and the fourth coolant outlet is connected to the second coolant outlet.

2. The engine cooling system according to claim 1, characterized in that: The first coolant inlet is arranged on a side of the cylinder head lower water jacket close to the exhaust side of the engine, and the first coolant outlet is arranged on a side of the cylinder head lower water jacket close to the intake side of the engine.

3. The engine cooling system according to claim 1, characterized in that: The cylinder head upper water jacket is provided with a third coolant outlet, and the third coolant outlet is connected to the third coolant inlet and the water pump at the same time. The third coolant outlet is located on a side of the cylinder head upper water jacket close to the engine exhaust side.

4. The engine cooling system according to claim 3, characterized in that: The third coolant outlet is connected to the second coolant outlet and then connected to the water pump.

5. The engine cooling system according to claim 1, characterized in that: The water pump includes an electric water pump connected to the first coolant inlet.

6. The engine cooling system according to claim 1, characterized in that: The engine cooling system includes a heater core and an exhaust gas recirculation cooler, wherein the inlet of the heater core is connected to the second coolant outlet, the outlet of the heater core is connected to the inlet of the exhaust gas recirculation cooler, and the outlet of the exhaust gas recirculation cooler is connected to the water pump.

7. A car, characterized in that: An engine cooling system comprising any one of claims 1-6.

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