A diesel engine parallel high-efficiency cooling system and method

Abstract

The present invention belongs to the technical field of diesel engine cooling, and in particular, is a parallel high-efficiency cooling system and method for diesel engines, comprising a diesel engine body, wherein a cylinder head connected to the cylinder head is arranged at the upper part of the engine body, and a water pump connected to the cylinder head is arranged at the lower exhaust side of the engine body near the front end of the engine body; an oil cooler connected to the cylinder head is arranged at the rear end of the water pump, and the water inlet and return channels of the oil cooler are connected to the water channel of the water pump; a thermostat is connected to the front end output end of the cylinder head through a pipeline; and a radiator is connected to the front end output end of the thermostat through a pipeline. The present invention arranges the coolant entering the oil cooler in parallel with the coolant channel entering the engine body, so that the cooling of the oil cooler and the engine body water jacket does not affect each other, thereby achieving the purpose of efficiently cooling the engine oil, improving the working efficiency of each system, and at the same time ensuring that the coolant flow distribution of the cylinder water jacket and the cylinder head water jacket is uniform, thereby improving the reliability of the diesel engine.

Description

Technical Field

[0001] The invention belongs to the technical field of diesel engine cooling, and in particular relates to a parallel high-efficiency cooling system and method for a diesel engine. Background Art

[0002] When a diesel engine is working, the parts in contact with high-temperature fuel gas are subject to huge heat loads. Improper cooling will cause the diesel engine to overheat, affecting its operating reliability. As the degree of strengthening of modern diesel engines increases, the heat load is also increasing.

[0003] The circulation method of the traditional diesel engine cooling system is that the coolant flowing out of the water pump first flows into the oil cooler, then flows into the engine body, flows through the engine cooler arranged inside the engine body, then enters the engine water jacket, and then enters the cylinder head, from the front end of the cylinder head to the thermostat, which is a series cooling method, but the engine body and cylinder head at the end of the cooling circuit are poorly cooled, which is not conducive to the efficient operation of the engine and energy saving and emission reduction; at the same time, the heat sink of the engine cooler arranged on the engine body is immersed in the water cavity and is cooled by the coolant flowing through. If the gap between the heat sink and the engine body is not set reasonably, it will lead to poor cooling of the engine cooler. At the same time, this structure has a weakening effect on the engine body rigidity, thereby reducing the reliability of the diesel engine. Summary of the invention

[0004] In order to solve the above technical problems, the object of the present invention is to provide a diesel engine parallel high-efficiency cooling system and method to meet the cooling problem of high-strength diesel engines, thereby improving the working reliability of the diesel engine.

[0005] The purpose of the present invention can be achieved by adopting the following technical solutions: A parallel high-efficiency cooling system for a diesel engine comprises a diesel engine body, wherein a cylinder head connected to the cylinder head is arranged at the upper part of the cylinder head, and a water pump connected to the cylinder head is arranged at a position close to the front end of the cylinder head at the exhaust side of the lower part of the cylinder head; an oil cooler connected to the oil cooler is arranged at the rear end of the water pump, and the water inlet and return channels of the oil cooler are connected to the water channel of the water pump; a thermostat is connected to the front end output end of the cylinder head through a pipeline; a radiator is connected to the radiator output end through a pipeline, and the middle output end of the thermostat is connected in parallel to the pipeline from the radiator to the water pump through a pipeline; a coolant distribution module is arranged at the rear end of the cylinder head; a post-processing system, a heating system and an air compressor system are connected to the rear end of the coolant distribution module through their own independent input end pipelines; the coolant output end pipelines of the post-processing system, the heating system and the air compressor system are connected in parallel and connected to the input end of the water pump.

[0006] The post-treatment system is arranged on the whole machine, and its water intake comes from the coolant distribution module at the rear end of the cylinder head and is connected in parallel with the water intake of the heating system. Its return water end is connected to the water pump inlet end through a pipeline.

[0007] The heating system is arranged on the whole machine, and its water is taken from the coolant distribution module at the rear end of the cylinder head, and its return water end is connected to the water pump inlet end through a pipeline.

[0008] The air compressor system is arranged on the engine, and its water intake comes from the coolant distribution module at the rear end of the cylinder head, and is arranged in parallel with the water intake of the heating system and the after-treatment system. The return water end is connected to the water pump inlet end through a pipeline.

[0009] The radiator is arranged on the whole machine and connected with the thermostat and the water pump; the oil cooler is arranged outside the machine body, and a heat sink is also arranged on the shell of the oil cooler.

[0010] A body water jacket is arranged on the upper part of the body and is arranged at a certain distance from the top surface of the body; the cylinder head comprises a cylinder head lower water jacket arranged at the lower part and a cylinder head upper water jacket arranged at the upper part; the cylinder head lower water jacket and the body water jacket are connected through the lower water channel and the body water channel.

[0011] The lower water jacket of the cylinder head is provided with a main water passage communicating therewith; the upper water jacket of the cylinder head is provided with a secondary water passage communicating therewith.

[0012] The engine body water jacket is connected to the lower water jacket and the upper water jacket of the cylinder head; a water jacket water inlet is arranged on one side of the engine body water jacket; the water jacket water inlet is located on the left side of the water jacket, the water jacket water channel is connected to the water jacket around the cylinder hole, and the engine body and the cylinder head water jacket are connected through the water channel.

[0013] The main water passage is one for each cylinder and is arranged at the center of the cylinder; the secondary water passage is arranged at the rear end of the last cylinder, between the lower water jacket and the upper water jacket, and is connected in parallel with the main water passage.

[0014] The present invention also provides a diesel engine parallel high-efficiency cooling method, comprising the following steps: S1: The cooling circuit is divided into a primary circuit and a secondary circuit, and both circuits use parallel distribution of coolant; S2: The primary circuit consists of two parallel circulation circuits: one is water pump-oil cooler-water pump; the other is water pump-engine body-cylinder head-thermostat-radiator-water pump; S3: After the coolant in the primary circuit is pressurized by the water pump, it enters the oil cooler through the water passage connected to the oil cooler, cools the oil, and returns to the water pump inlet through the return water passage between the oil cooler and the water pump, and enters the water pump again for the next cooling cycle; S4: The coolant in the primary circuit is pressurized by the water pump and then enters the annular engine water jacket on the upper part of the engine body. After cooling the engine body, it enters the lower water jacket of the cylinder head through the water passage between the engine water jacket and the cylinder head water jacket. S5: The coolant in the lower water jacket of the cylinder head enters the upper water jacket of the cylinder head through the water passage between the upper and lower water jackets; S6: The coolant in the upper water jacket of the cylinder head enters the water inlet chamber of the thermostat. The thermostat detects the coolant temperature and distributes the coolant flow directly back to the water pump and the coolant flow back to the water pump after being cooled by the radiator, thus completing the diesel engine cooling cycle in the primary circuit. S7: The coolant from the upper water jacket of the cylinder head enters the secondary circuit toward the rear coolant distribution module; S8: The secondary circuit is composed of multiple circulation loops in parallel, namely the heating circulation loop of the after-treatment system, the heating circulation loop of the warm air system and the cooling circulation loop of the air compressor system. The coolant in each circuit flows out from the coolant distribution module at the same time, and returns to the water pump inlet after achieving their respective functions, and is used to cool the air compressor and other accessory systems, while providing high-temperature medium for heating for the after-treatment, warm air and other systems.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention arranges the coolant entering the oil cooler in parallel with the coolant channel entering the engine body, so that the cooling of the oil cooler and the engine body water jacket are independent of each other, thereby achieving the purpose of efficiently cooling the engine oil; at the same time, the water intake of the post-treatment system, the water intake of the heating system, and the water intake of the air compressor system are arranged in parallel without affecting each other, thereby improving the working efficiency of each system, ensuring uniform flow distribution of the cylinder water jacket and the cylinder head water jacket, avoiding local overheating and overcooling of the cylinder body or the cylinder head, and improving the reliability of the diesel engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural block diagram of the present invention.

[0017] Figure 2 The structure of the present invention is schematically shown Figure 1 .

[0018] Figure 3 The structure of the present invention is schematically shown Figure 2 .

[0019] Figure 4 It is a schematic diagram of the water jacket of the machine body in the present invention.

[0020] Figure 5 It is a schematic diagram of the cylinder head water jacket in the present invention.

[0021] In the figure: 1. engine body; 2. cylinder head; 3. water pump; 4. oil cooler; 5. thermostat; 6. after-treatment system; 7. heating system; 8. air compressor system; 9. radiator; 10. coolant distribution module, 101. engine body water jacket; 101A. engine body water channel; 101B. water jacket water channel; 101C. water jacket water inlet; 101D. water jacket around cylinder hole; 201. lower water jacket of cylinder head; 201A. lower water channel; 202. upper water jacket of cylinder head; 203. main water passage; 204. secondary water passage. DETAILED DESCRIPTION

[0022] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings.

[0023] like Figures 1 to 5 As shown, a parallel high-efficiency cooling system for a diesel engine comprises a diesel engine body 1, wherein a cylinder head 2 connected thereto is disposed on the upper portion of the engine body 1, and a water pump 3 connected thereto is disposed at a position close to the front end of the engine body 1 at the exhaust side of the lower portion of the engine body 1; an oil cooler 4 connected thereto is disposed at the rear end of the water pump 3, and the water inlet and return channels of the oil cooler 4 are connected to the water channel of the water pump 3; a thermostat 5 is connected to the front output end of the cylinder head 2 through a pipeline; a radiator 9 is connected to the front output end of the thermostat 5 through a pipeline; the output end of the radiator 9 is connected to the input end of the water pump 3 through a pipeline, and the thermostat 5 is connected to the radiator 9 through a pipeline. The middle output end of the cooler 5 is connected in parallel to the pipeline from the radiator 9 to the water pump 3 through a pipeline; a coolant distribution module 10 is provided at the rear end of the cylinder head 2; the rear end of the coolant distribution module 10 is connected to the post-processing system 6, the heating system 7 and the air compressor system 8 through their own independent input end pipelines; the coolant output end pipelines of the post-processing system 6, the heating system 7 and the air compressor system 8 are connected in parallel and connected to the input end of the water pump 3; here, the water intake of the post-processing system 6, the water intake of the heating system 7, and the water intake of the air compressor system 8 are arranged in parallel without affecting each other, thereby improving the working efficiency of each system.

[0024] The after-treatment system 6 is arranged on the whole machine, and its water is taken from the coolant distribution module 10 at the rear end of the cylinder head 2, and is connected in parallel with the water intake of the warm air system 7, and its return water end is connected to the inlet end of the water pump 3 through a pipeline; the warm air system 7 is arranged on the whole machine, and its water is taken from the coolant distribution module 10 at the rear end of the cylinder head 2, and its return water end is connected to the inlet end of the water pump 3 through a pipeline; the air compressor system 8 is arranged on the engine, and its water is taken from the coolant distribution module 10 at the rear end of the cylinder head 2, and is arranged in parallel with the water intake of the warm air system 7 and the after-treatment system 6, and its return water end is connected to the inlet end of the water pump 3 through a pipeline.

[0025] The radiator 9 is arranged on the whole machine and is connected to the thermostat 5 and the water pump 3; the oil cooler 4 is arranged outside the engine body 1, and the oil filter and the like can be integrated to achieve the purpose of modular design. A heat sink is also arranged on the shell of the oil cooler 4; when the diesel engine is working, the coolant cools the oil through the heat sink of the oil cooler 4. At the same time, the wind on the outer surface of the diesel engine also cools the heat sink of the oil cooler 4 to further cool the oil. At the same time, the number of heat sinks can be freely adjusted according to the heat dissipation demand of the oil coolant.

[0026] The upper part of the engine body 1 is provided with an engine body water jacket 101, and a certain distance is set from the top surface of the engine body 1; the cylinder head 2 includes a lower cylinder head water jacket 201 provided at the lower part and an upper cylinder head water jacket 202 provided at the upper part; the lower cylinder head water jacket 201 is connected to the engine body water jacket 101 through the lower water channel 201A and the engine body water channel 101A; the lower cylinder head water jacket 201 is provided with a main water passage 203 connected thereto; the upper cylinder head water jacket 202 is provided with a secondary water passage 204 connected thereto. The main water passage 203 provided between the upper and lower water jackets of the cylinder head can efficiently cool the injector provided at the center of the cylinder, and the secondary water passage 204 can increase the local flow velocity of the upper water jacket, so as to achieve a uniform cooling effect and further improve the cooling efficiency.

[0027] The engine body water jacket 101 is interconnected with the cylinder head lower water jacket 201 and the cylinder head upper water jacket 202; a water jacket water inlet 101C is provided on one side of the engine body water jacket 101; the water jacket water inlet 101C is located on the left side of the water jacket, the water jacket water channel 101B is connected to the water jacket 101D around the cylinder hole, and the engine body 1 is connected to the cylinder head water jacket through the engine body water channel 101A; here, the coolant first enters the cylinder head lower water jacket 201 from the engine body water jacket 101 to cool the cylinder head bottom plate with high heat load, and then enters the cylinder head upper water jacket 202 through the main water passage 203 and the secondary water passage 204 between the upper and lower water jackets of the cylinder head, so as to achieve the purpose of cooling on demand and realize efficient cooling.

[0028] The main water passage 203 is provided for each cylinder and is arranged at the center of the cylinder; the secondary water passage 204 is provided at the rear end of the last cylinder, between the lower water jacket 201 of the cylinder head and the upper water jacket 202 of the cylinder head, and is connected in parallel with the main water passage 203 .

[0029] The present invention also provides a diesel engine parallel high-efficiency cooling method, comprising the following steps: S1: The cooling circuit is divided into a primary circuit and a secondary circuit, and both circuits use parallel distribution of coolant.

[0030] S2: The primary circuit consists of two parallel circulation circuits: one is water pump 3-oil cooler 4-water pump 3, which is used to cool the engine oil; the other is water pump 3-engine body 1-cylinder head 2-thermostat 5-radiator 9-water pump 3, which is used to cool the diesel engine body 1 and cylinder head 2.

[0031] S3: After being pressurized by the water pump 3, the coolant in the primary circuit enters the oil cooler 4 through the water passage connected to the oil cooler 4. After cooling the oil, it returns to the inlet of the water pump 3 through the return water passage between the oil cooler 4 and the water pump 3, and enters the water pump 3 again for the next cooling cycle, thereby completing the oil cooling cycle in the primary circuit.

[0032] S4: The coolant in the primary circuit is pressurized by the water pump 3, and then enters the annular engine water jacket 101 on the upper part of the engine body 1. After cooling the engine body 1, the coolant enters the lower water jacket 201 of the cylinder head through the water passage between the engine water jacket 101 and the cylinder head water jacket to cool the cylinder head fire surface.

[0033] S5: The coolant in the lower water jacket 201 of the cylinder head enters the upper water jacket 202 of the cylinder head through the water passage between the upper and lower water jackets.

[0034] S6: The coolant in the upper water jacket 202 of the cylinder head flows forward into the water inlet chamber of the thermostat 5. The thermostat 5 detects the coolant temperature and distributes the coolant flow directly back to the water pump 3 and the coolant flow back to the water pump 3 after being cooled by the radiator 9, thereby completing the diesel engine body and cylinder head cooling cycle in the primary circuit.

[0035] S7: The coolant in the upper water jacket 202 of the cylinder head flows backward through the coolant distribution module 10 into the secondary circuit.

[0036] S8: The secondary circuit is composed of multiple circulation circuits in parallel, namely the heating circulation circuit of the post-processing system 6, the heating circulation circuit of the warm air system 7 and the cooling circulation circuit of the air compressor system 8. The coolant in each circuit flows out from the coolant distribution module 10 at the same time, and returns to the inlet of the water pump 3 after achieving their respective functions, and is used to cool the air compressor and other accessory systems, while providing a high-temperature medium for heating for the post-processing, warm air and other systems.

[0037] The post-processing system 6 heats the circulation loop and controls the flow of coolant entering the system by detecting the ambient temperature. When the ambient temperature reaches the freezing temperature of the post-processing system, the solenoid valve inside the system opens to adjust the flow of coolant entering the post-processing system to prevent the post-processing system from freezing.

[0038] The heating circulation loop of the heating system 7 controls the coolant to enter the heating system 7 by detecting the state of the heating switch. When the heating switch is in the on state, the coolant enters the heating system 7 to provide a heat source for the heating system 7. When the heating switch is in the off state, the coolant does not enter the heating system 7.

[0039] The air compressor system 8 is a cooling circulation loop. When the diesel engine is working, the coolant always keeps circulating to cool the air compressor.

[0040] The present invention utilizes the coolant entering the oil cooler and the coolant channel entering the engine body to be arranged in parallel, so that the cooling of the oil cooler and the engine body water jacket are independent of each other, thereby achieving the purpose of efficiently cooling the engine oil; the water intake of the post-processing system, the water intake of the heating system, and the water intake of the air compressor system are arranged in parallel without affecting each other, thereby improving the working efficiency of each system. At the same time, the water intake of each system comes from the upper water jacket at the rear end of the cylinder head, further optimizing the flow rate of the upper water jacket at the rear end of the cylinder head, improving the uniformity of the flow field of the entire cylinder head water jacket, thereby improving the cooling efficiency of the cylinder head and improving the reliability of the diesel engine.

[0041] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A diesel engine parallel high-efficiency cooling system, comprising a diesel engine body (1), characterized in that: The upper part of the engine body (1) is provided with a cylinder head (2) in communication with the engine body (1), and the lower exhaust side of the engine body (1) is provided with a water pump (3) in communication with the engine body (1) at a position close to the front end of the engine body (1); the rear end of the water pump (3) is provided with an oil cooler (4) in communication with the engine body (3), and the water inlet and return channels of the oil cooler (4) are connected to the water channel of the water pump (3); the front output end of the cylinder head (2) is connected with a thermostat (5) through a pipeline; the front output end of the thermostat (5) is connected with a radiator (9) through a pipeline; the output end of the radiator (9) is connected to the water pump (4) through a pipeline. The cylinder head (2) is connected to the input end of the pump (3), and the middle output end of the thermostat (5) is connected in parallel to the pipeline from the radiator (9) to the water pump (3) through a pipeline; a coolant distribution module (10) is provided at the rear end of the cylinder head (2); the rear end of the coolant distribution module (10) is connected to the post-processing system (6), the heating system (7) and the air compressor system (8) through their own independent input end pipelines; the coolant output end pipelines of the post-processing system (6), the heating system (7) and the air compressor system (8) are connected in parallel and connected to the input end of the water pump (3).

2. The diesel engine parallel high-efficiency cooling system according to claim 1 is characterized in that: The post-treatment system (6) is arranged on the whole machine, and its water intake comes from the coolant distribution module (10) at the rear end of the cylinder head (2), and is connected in parallel with the water intake of the warm air system (7), and its return water end is connected to the inlet end of the water pump (3) through a pipeline.

3. The diesel engine parallel high-efficiency cooling system according to claim 1 is characterized in that: The warm air system (7) is arranged on the whole machine, and its water intake comes from the coolant distribution module (10) at the rear end of the cylinder head (2), and its water return end is connected to the inlet end of the water pump (3) through a pipeline.

4. The diesel engine parallel high-efficiency cooling system according to claim 1 is characterized in that: The air compressor system (8) is arranged on the engine, and its water intake comes from the coolant distribution module (10) at the rear end of the cylinder head (2). It is arranged in parallel with the water intake of the heating system (7) and the post-treatment system (6), and the return water end is connected to the inlet end of the water pump (3) through a pipeline.

5. The diesel engine parallel high-efficiency cooling system according to claim 1 is characterized in that: The radiator (9) is arranged on the whole machine and is connected to the thermostat (5) and the water pump (3); the oil cooler (4) is arranged outside the machine body (1), and a heat sink is also arranged on the shell of the oil cooler (4).

6. The diesel engine parallel high-efficiency cooling system according to claim 1 is characterized in that: A body water jacket (101) is arranged on the upper part of the body (1) and is arranged at a certain distance from the top surface of the body (1); the cylinder head (2) comprises a cylinder head lower water jacket (201) arranged at the lower part and a cylinder head upper water jacket (202) arranged at the upper part; the cylinder head lower water jacket (201) and the body water jacket (101) are connected via a lower water channel (201A) and a body water channel (101A).

7. The diesel engine parallel high-efficiency cooling system according to claim 6 is characterized in that: The lower water jacket (201) of the cylinder head is provided with a main water passage (203) in communication therewith; and the upper water jacket (202) of the cylinder head is provided with a secondary water passage (204) in communication therewith.

8. The diesel engine parallel high-efficiency cooling system according to claim 6 is characterized in that: The engine body water jacket (101) is in communication with the cylinder head lower water jacket (201) and the cylinder head upper water jacket (202); a water jacket water inlet (101C) is provided on one side of the engine body water jacket (101); the water jacket water inlet (101C) is located on the left side of the water jacket; a water jacket water channel (101B) is connected to a water jacket (101D) around the cylinder hole; and the engine body (1) and the cylinder head (2) water jackets are connected via the water channel.

9. The diesel engine parallel high-efficiency cooling system according to claim 7 is characterized in that: The main water passage (203) is provided in each cylinder and is arranged at the center of the cylinder; the secondary water passage (204) is provided at the rear end of the last cylinder, between the lower water jacket and the upper water jacket, and is connected in parallel with the main water passage (203).

10. A diesel engine parallel high-efficiency cooling method, characterized in that: The steps include: S1: The cooling circuit is divided into a primary circuit and a secondary circuit, and both circuits use parallel distribution of coolant; S2: The primary circuit is composed of two circulation circuits connected in parallel: one circuit is a water pump (3) - oil cooler (4) - water pump (3) for cooling the engine oil, and the other circuit is a water pump (3) - engine body (1) - cylinder head (2) - thermostat (5) - radiator (9) - water pump (3) for cooling the diesel engine body (1) and cylinder head (2); S3: After the coolant in the primary circuit is pressurized by the water pump (3), it enters the oil cooler (4) through the water passage connected to the oil cooler (4), cools the oil, returns to the inlet of the water pump (3) through the return water passage between the oil cooler (4) and the water pump (3), and enters the water pump (3) again for the next cooling cycle, thereby completing the oil cooling cycle in the primary circuit; S4: After the coolant in the primary circuit is pressurized by the water pump (3), the coolant enters the annular engine water jacket (101) at the upper part of the engine body (1) through another path, cools the engine body (1), and then enters the lower water jacket (201) of the cylinder head through the water passage between the engine water jacket (101) and the cylinder head water jacket, thereby cooling the cylinder head fire surface; S5: The coolant in the lower water jacket (201) of the cylinder head enters the upper water jacket (202) of the cylinder head through the water passage between the upper and lower water jackets; S6: The coolant in the upper water jacket (202) of the cylinder head enters the water inlet chamber of the thermostat (5). The thermostat (5) detects the coolant temperature and distributes the coolant flow rate to directly return to the water pump (3) and to return to the water pump (3) after being cooled by the radiator (9), thereby completing the cooling cycle of the diesel engine body and the cylinder head in the primary circuit; S7: The coolant in the upper water jacket (202) of the cylinder head flows backward through the coolant distribution module (10) into the secondary circuit; S8: The secondary loop is composed of a plurality of circulation loops connected in parallel, namely, a heating circulation loop of the post-processing system (6), a heating circulation loop of the warm air system (7) and a cooling circulation loop of the air compressor system (8). The coolant in each loop flows out from the coolant distribution module (10) at the same time, and after fulfilling their respective functions, returns to the inlet of the water pump (3) to be used for cooling accessory systems such as the air compressor, and at the same time provides a high-temperature medium for heating the post-processing system, the warm air system and the like.

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