High-horsepower EGR (Exhaust Gas Recirculation) engine technology

Abstract

The invention discloses a high-horsepower EGR (exhaust gas recirculation) engine technology and relates to the technical field of engine cooling. An upper water channel cavity and a lower water channel cavity are formed in one side of a cylinder body, an engine oil cooler is fixedly arranged on the cylinder body, the upper water channel cavity and the lower water channel cavity are both connected with the engine oil cooler, and each cylinder in the cylinder body is provided with a water jacket cavity; a separating ring is arranged in the middle of the water jacket cavity and divides the water jacket cavity into an upper cavity and a lower cavity, the upper cavity and the lower cavity are communicated through a notch, the lower water channel cavity and the lower cavity are communicated through a main water inlet hole, the upper water channel cavity and the upper cavity are communicated through an auxiliary water inlet hole, and a water outlet hole communicated with the upper cavity is formed in the top of the air cylinder body. An EGR cooler assembly is further arranged on the air cylinder body. Through the arrangement of the auxiliary water inlet holes, part of cooling water in the upper water channel cavity can directly enter the upper cavity, the water flow speed is increased to reduce the temperature of the upper portion of the cylinder sleeve in the upper cavity, and therefore it is guaranteed that all parts of an engine are well cooled.

Description

Technical Field

[0001] The present invention relates to the technical field of engine cooling, and more specifically to a high-horsepower EGR engine technology. Background Art

[0002] When the engine is working, the parts in contact with high-temperature gas will produce greater thermal stress, thermal deformation, and performance degradation or even failure due to overheating, which will lead to increased wear, reduced engine efficiency, abnormal operation and other serious consequences that affect the stability and reliability of the engine. The engine cooling system is an auxiliary system that is used to cool the parts of the engine that are heated by high temperatures to the allowable temperature range, so that the engine can work normally.

[0003] In the prior art, for example, a Chinese invention patent with the announcement number CN106438086B discloses a water jacket structure for an engine cylinder block, wherein the cooling water of the engine is pressed into the front water channel cavity of the oil cooler through the water inlet of the cylinder block, and all flows into the external oil cooler through the water outlet of the front water channel cavity of the oil cooler; after the engine oil is fully cooled, it flows into the rear water channel cavity of the oil cooler through the water inlet of the rear water channel cavity of the oil cooler; and then flows into the cylinder liner water jacket cavity through the water jacket cavity water inlet of the cylinder liner water jacket cavity, so as to achieve uniform cooling of the engine cylinder block. However, the above technical solution still has the following defects: after entering the cylinder liner water jacket cavity, the cooling water flows from bottom to top, but because the cooling water continuously absorbs heat during the flow process, the cooling water temperature in the upper area of ​​the cylinder liner water jacket cavity becomes high, which leads to insufficient cooling of the upper part of the cylinder bore. Summary of the invention

[0004] In order to overcome the defects of the prior art, the present invention proposes a high-horsepower EGR engine technology. By setting a secondary water inlet hole, part of the cooling water in the upper water channel cavity can directly enter the upper chamber, thereby accelerating the water flow speed to reduce the temperature of the upper part of the cylinder liner in the upper chamber, thereby ensuring good cooling of all parts of the engine.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] The present invention provides a high-horsepower EGR engine technology, including a cylinder body, an EGR cooler assembly and an oil cooler. An upper water channel cavity and a lower water channel cavity are arranged on one side of the cylinder body. The oil cooler is fixed on the cylinder body, and the upper water channel cavity and the lower water channel cavity are both connected to the oil cooler. Each cylinder in the cylinder body is provided with a water jacket cavity. A separation ring is arranged in the middle of the water jacket cavity to separate the water jacket cavity into an upper chamber and a lower chamber. A notch is arranged on the separation ring. The upper chamber and the lower chamber are connected to each other through the notch. The lower water channel cavity is connected to the lower chamber through a main water inlet hole, and the upper water channel cavity is connected to the upper chamber through a secondary water inlet hole. A water outlet hole connected to the upper chamber is arranged on the top of the cylinder body. An EGR cooler assembly is also arranged on the cylinder body. The EGR cooler assembly is connected to the oil cooler.

[0007] In a preferred technical solution of the present invention, two auxiliary water inlet holes are provided.

[0008] In a preferred technical solution of the present invention, the diameter of the secondary water inlet hole is smaller than the diameter of the main water inlet hole.

[0009] In a preferred technical solution of the present invention, the EGR cooler assembly includes an EGR cooler, a cooling water inlet pipe, a cooling water outlet pipe, an integrated EGR valve and an exhaust gas outlet pipe. The EGR cooler is fixedly mounted on the cylinder block. A cooling water inlet pipe is provided at the bottom of the EGR cooler, and the free end of the cooling water inlet pipe is connected to the oil cooler. A cooling water outlet pipe is provided at the top of the EGR cooler. One end of the EGR cooler is connected to an integrated EGR valve, and the other end of the EGR cooler is connected to the exhaust gas outlet pipe.

[0010] In a preferred technical solution of the present invention, the integrated EGR valve consists of an EGR valve body and an EGR intake pipe.

[0011] In a preferred technical solution of the present invention, the notch includes a first notch and a second notch.

[0012] The beneficial effects of the present invention are:

[0013] The high-horsepower EGR engine technology proposed in the present invention allows part of the cooling water in the upper water channel cavity to directly enter the upper cavity by setting a secondary water inlet hole, speeding up the water flow to reduce the temperature of the upper part of the cylinder liner in the upper cavity, thereby ensuring good cooling of all parts of the engine. Since the valve seat is eliminated, the overall size of the integrated EGR valve becomes smaller, so the size of the EGR cooler can be designed to be larger and longer accordingly, which helps to improve the cooling effect. Compared with the currently commonly used SCR route engine, this device does not need to use urea, and the quality requirements for fuel and oil are further reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1It is a three-dimensional structural schematic diagram of a high-horsepower EGR engine technology provided by a specific embodiment of the present invention;

[0015] Figure 2 yes Figure 1 Rear view of

[0016] Figure 3 yes Figure 2 A cross-sectional view of the cylinder block along the AA direction;

[0017] Figure 4 yes Figure 2 Cross-sectional view of the cylinder block along the BB direction.

[0018] In the figure:

[0019] 1. Cylinder block; 11. Upper water channel cavity; 12. Lower water channel cavity; 13. Water jacket cavity; 131. Upper chamber; 132. Lower chamber; 14. Separator ring; 141. First notch; 142. Second notch; 15. Main water inlet hole; 16. Secondary water inlet hole; 17. Water outlet hole; 2. EGR cooler assembly; 21. EGR cooler; 22. Cooling water inlet pipe; 23. Cooling water outlet pipe; 24. Integrated EGR valve; 241. EGR valve body; 242. EGR intake pipe; 25. Exhaust gas outlet pipe; 3. Oil cooler. DETAILED DESCRIPTION

[0020] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0021] like Figure 1-4As shown, the embodiment provides a high-horsepower EGR engine technology, including a cylinder block 1, an EGR cooler assembly 2 and an oil cooler 3. An upper water channel cavity 11 and a lower water channel cavity 12 are arranged on one side of the cylinder block 1. The oil cooler 3 is fixed on the cylinder block 1, and the upper water channel cavity 11 and the lower water channel cavity 12 are both connected to the oil cooler 3. Each cylinder in the cylinder block 1 is provided with a water jacket cavity 13. A separation ring 14 is arranged in the middle of the water jacket cavity 13 to separate the water jacket cavity 13 into an upper chamber 1 31 and the lower chamber 132, a notch is provided on the separation ring 14, the upper chamber 131 and the lower chamber 132 are connected to each other through the notch, the lower chamber 12 is connected to the lower chamber 132 through the main water inlet hole 15, the upper chamber 11 is connected to the upper chamber 131 through the secondary water inlet hole 16, the top of the cylinder body 1 is provided with a water outlet hole 17 connected to the upper chamber 131, and the cylinder body 1 is also provided with an EGR cooler assembly 2, and the EGR cooler assembly 2 is connected to the oil cooler 3. In this embodiment, the upper chamber 11 is located above the lower chamber 12, and the upper chamber 11 and the lower chamber 12 are independently provided. Each cylinder in the cylinder block 1 is provided with a cylinder liner, and the cylinder liner and the side wall of the cylinder hole form a water jacket cavity 13. The separation ring 14 is horizontally arranged in the middle of the water jacket cavity 13, and the gap is provided so that the cooling water can flow between the upper chamber 131 and the lower chamber 132 to achieve cooling of the cylinder liner. Since the cooling water in the water jacket cavity 13 flows from bottom to top, the cooling water temperature in the lower chamber 132 is usually lower than the temperature in the upper chamber 131, which will lead to poor cooling effect of the upper chamber 131. By providing the auxiliary water inlet hole 16, part of the cooling water in the upper water channel cavity 11 will directly enter the upper chamber 131 through the auxiliary water inlet hole 16, thereby assisting in reducing the cooling water temperature in the upper chamber 131 and helping to improve the cooling effect. The water inlet of the EGR cooler assembly 2 is connected to the water outlet of the oil cooler 3. The oil cooler 3 is provided to divert part of the cooling water from the upper water channel cavity 11 to the EGR cooler assembly 2 for cooling the exhaust gas of the engine, which helps to reduce energy consumption, while the other part of the cooling water enters the lower water channel cavity 12 after cooling, and is used to cool the water jacket cavity 13. In addition, through actual tests, it is found that: using the cooling structure in the prior art (such as CN106438086B), the heat transfer coefficient (HTC) of the upper part of the cylinder liner is 2720, while using the cooling structure described in the present device, the heat transfer coefficient (HTC) of the upper part of the cylinder liner is 9383, which shows that the present device can achieve more uniform and efficient cooling.

[0022] Specifically, two auxiliary water inlet holes 16 are provided, and the two auxiliary water inlet holes 16 are symmetrically arranged on the left and right sides of the first notch 141 .

[0023] Specifically, the diameter of the secondary water inlet hole 16 is smaller than the diameter of the primary water inlet hole 15 .

[0024] Specifically, the EGR cooler assembly 2 includes an EGR cooler 21, a cooling water inlet pipe 22, a cooling water outlet pipe 23, an integrated EGR valve 24 and an exhaust gas outlet pipe 25. The EGR cooler 21 is fixedly mounted on the cylinder block 1. A cooling water inlet pipe 22 is disposed at the bottom of the EGR cooler 21, and the free end of the cooling water inlet pipe 22 is connected to the oil cooler 3. A cooling water outlet pipe 23 is disposed at the top of the EGR cooler 21. One end of the EGR cooler 21 is connected to the integrated EGR valve 24, and the other end of the EGR cooler 21 is connected to the exhaust gas outlet pipe 25. In this embodiment, the EGR cooler 21 is a square shell structure, and a cooling chamber that can accommodate coolant is arranged inside the EGR cooler 21, and the cooling chamber is an annular structure, and the cooling water inlet pipe 22 and the cooling water outlet pipe 23 are both connected to the cooling chamber, and the free end of the cooling water inlet pipe 22 is connected to the diversion outlet of the oil cooler 3. The oil cooler 3 can divert a part of the cooling water from the upper water channel cavity 11 to the diversion outlet, and then enter the cooling chamber through the cooling water inlet pipe 22, and then be discharged from the cooling water outlet pipe 23, so as to cool the exhaust gas. The engine exhaust gas can enter the EGR cooler 21 through the integrated EGR valve 24 for cooling, and then be discharged from the exhaust gas outlet pipe 25, and the opening of the integrated EGR valve 24 and the opening of the exhaust gas outlet pipe 25 are both facing upward.

[0025] Specifically, the integrated EGR valve 24 is composed of an EGR valve body 241 and an EGR intake pipe 242. The existing EGR valve is usually composed of three parts: an EGR valve body, an EGR valve seat and an EGR intake pipe. In this embodiment, since the valve seat is eliminated, the overall size of the integrated EGR valve 24 is reduced, so the size of the EGR cooler 21 can be designed to be larger and longer accordingly, which helps to improve the cooling effect.

[0026] As shown in Table 1 below, the cooling data of the existing EGR cooler (i.e., 175 horsepower EGR cooler) and the EGR cooler with the same structure as the present device (i.e., 200 horsepower new EGR cooler) are compared. It can be seen that the EGR cooler with the same structure as the present device has a better cooling effect.

[0027] Table 1 Cooling data comparison

[0028]

[0029] Specifically, the gap includes a first gap 141 and a second gap 142. In this embodiment, the first gap 141 is located at the separation ring 14 close to the upper water channel cavity 11, and the second gap 142 is located at the separation ring 14 away from the upper water channel cavity 11. By setting the first gap 141 and the second gap 142, the cooling water can flow in a ring in the lower chamber 132 to ensure the cooling effect.

[0030] Working principle: After the cooling water enters the upper water channel chamber 11, most of the cooling water will be cooled by the oil cooler 3 and then enter the lower water channel chamber 12, and then reach the upper chamber 131 through the main water inlet hole 15, the lower chamber 132 and the gap in turn, while a small part of the cooling water will directly enter the upper chamber 131 through the auxiliary water inlet hole 16 to achieve uniform cooling of the cylinder liner, and then the hot water in the upper chamber 131 will be discharged from the water outlet hole 17 to the cylinder head to cool the cylinder head. At the same time, the oil cooler 3 will also divert part of the cooling water from the upper water channel chamber 11 to the cooling water inlet pipe 22, and then the cooling water will reach the EGR cooler 21 after passing through the cooling water inlet pipe 22 to cool the engine exhaust gas.

[0031] The present invention is described by preferred embodiments, and those skilled in the art will appreciate that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. The present invention is not limited to the specific embodiments disclosed herein, and other embodiments falling within the claims of this application are within the scope of protection of the present invention.

Claims

1. A high horsepower EGR engine technology, characterized by: The invention comprises a cylinder block (1), an EGR cooler assembly (2) and an oil cooler (3); an upper water channel cavity (11) and a lower water channel cavity (12) are arranged on one side of the cylinder block (1); the oil cooler (3) is fixedly arranged on the cylinder block (1), and the upper water channel cavity (11) and the lower water channel cavity (12) are both connected to the oil cooler (3); each cylinder in the cylinder block (1) is provided with a water jacket cavity (13); a dividing ring (14) is arranged in the middle of the water jacket cavity (13) to divide the water jacket cavity (13) into an upper chamber (131) and a lower chamber (132); A notch is provided on the separation ring (14); the upper chamber (131) and the lower chamber (132) are connected to each other through the notch; the lower water channel chamber (12) and the lower chamber (132) are connected through a main water inlet hole (15); the upper water channel chamber (11) and the upper chamber (131) are connected through a secondary water inlet hole (16); a water outlet hole (17) connected to the upper chamber (131) is provided on the top of the cylinder body (1); an EGR cooler assembly (2) is also provided on the cylinder body (1); and the EGR cooler assembly (2) is connected to the oil cooler (3).

2. A high horsepower EGR engine technology according to claim 1, characterized in that: Two auxiliary water inlet holes (16) are provided.

3. A high horsepower EGR engine technology according to claim 1, characterized in that: The diameter of the secondary water inlet hole (16) is smaller than the diameter of the primary water inlet hole (15).

4. A high horsepower EGR engine technology according to claim 1, characterized in that: The EGR cooler assembly (2) comprises an EGR cooler (21), a cooling water inlet pipe (22), a cooling water outlet pipe (23), an integrated EGR valve (24) and an exhaust gas outlet pipe (25); the EGR cooler (21) is fixedly mounted on the cylinder block (1); a cooling water inlet pipe (22) is arranged at the bottom of the EGR cooler (21), and the free end of the cooling water inlet pipe (22) is connected to the oil cooler (3); a cooling water outlet pipe (23) is arranged at the top of the EGR cooler (21); one end of the EGR cooler (21) is connected to the integrated EGR valve (24), and the other end of the EGR cooler (21) is connected to the exhaust gas outlet pipe (25).

5. A high horsepower EGR engine technology according to claim 4, characterized in that: The integrated EGR valve (24) consists of an EGR valve body (241) and an EGR intake pipe (242).

6. A high horsepower EGR engine technology according to claim 1, characterized in that: The notch includes a first notch (141) and a second notch (142).

Images