Diesel engine cooling system

Abstract

The utility model provides a diesel engine cooling system which comprises a main liquid path, a preheating loop and a cooling loop, the preheating loop and the cooling loop are connected to the main liquid path in parallel, the preheating loop is used for heating liquid flowing through the main liquid path, and the cooling loop is used for cooling the liquid flowing through the main liquid path; an outlet of the cooling loop is provided with a first valve used for controlling the flow direction, on-off or flow volume percentage of liquid, and an inlet of the cooling loop is provided with a second valve used for controlling the flow direction, on-off or flow volume percentage of the liquid. According to the application, the first valve and the second valve are respectively arranged at the outlet and the inlet of the cooling loop, so that the flow direction, the on-off state or the flow rate percentage of the liquid at the inlet and the outlet of the cooling loop can be controlled, and heat loss caused by the fact that the heated liquid in the preheating loop flows to the cooling loop is prevented or reduced; therefore, the liquid in the main liquid path can be heated to the preset temperature by the preheating loop, normal operation of the diesel engine is guaranteed, and meanwhile energy loss can be reduced.

Description

Technical Field

[0001] This application belongs to the technical field of diesel engines, and more specifically, relates to a diesel engine cooling system. Background Art

[0002] A diesel engine is an engine that obtains energy release by burning diesel. When a diesel engine is working, due to the direct contact between components such as pistons, cylinders, and cylinder heads with the combustion gas, they are strongly heated. In addition, a turbocharger increases the intake air volume of the diesel engine to increase combustion, and a large amount of heat is also generated during its working process. If these components are not properly cooled and the heat is not dissipated in time, it will cause a decline in the mechanical properties of the component materials, and adverse effects such as an increase in the thermal stress and thermal deformation of the components. In addition, when the diesel engine is in a standby state, in order to avoid the difficulty of starting the important components of the diesel engine due to being in a low-temperature state for a long time, a preheating device needs to be added to the diesel engine cooling system. However, due to the simultaneous presence of the preheating device and the cooling device, the liquid heated by the preheating device will flow to the cooling device, resulting in heat loss, making it difficult for the important components of the diesel engine to start because they do not reach the preset temperature range. Summary of the Utility Model

[0003] The purpose of the embodiments of this application is to provide a diesel engine cooling system to solve the technical problem that the heat of the preheating device in the existing diesel engine cooling system is easily dissipated.

[0004] To achieve the above purpose, the technical solution adopted in this application is: to provide a diesel engine cooling system, including a main liquid circuit, a preheating circuit, and a cooling circuit. The preheating circuit and the cooling circuit are respectively connected in parallel to the main liquid circuit. The preheating circuit is used to heat the liquid flowing through the main liquid circuit, and the cooling circuit is used to cool the liquid flowing through the main liquid circuit. A first valve for controlling the flow direction, on-off, or flow rate percentage of the liquid is provided at the outlet of the cooling circuit, and a second valve for controlling the flow direction, on-off, or flow rate percentage of the liquid is provided at the inlet of the cooling circuit.

[0005] In one embodiment, the first valve is a first check valve, and the first check valve allows the liquid in the cooling circuit to flow to the main liquid circuit, and the first check valve prevents the liquid in the main liquid circuit from flowing to the cooling circuit.

[0006] In one embodiment, the first valve is a first on-off valve or a first flow valve installed near the outlet in the cooling circuit;

[0007] Alternatively, the first valve is a first three-way valve installed at the connection between the outlet of the cooling circuit and the main liquid circuit.

[0008] In one embodiment, the second valve is a second three-way valve installed at the connection between the inlet of the cooling circuit and the main liquid path;

[0009] Alternatively, the second valve is a second check valve, a second on-off valve or a second flow valve installed near the inlet in the cooling circuit.

[0010] In one embodiment, an air cooler is provided in the cooling circuit.

[0011] In one embodiment, a heating device and a liquid driving pump are provided in the preheating circuit. The liquid driving pump is used to pump the liquid in the main liquid path into the preheating circuit, and the heating device is used to heat the liquid in the preheating circuit.

[0012] In one embodiment, the diesel engine cooling system further includes at least two parallel liquid branch paths. The main liquid path transports cooling liquid or preheating liquid to each of the liquid branch paths respectively, and the liquid branch paths flow through the parts to be processed of the diesel engine to cool or preheat the parts to be processed.

[0013] In one embodiment, the diesel engine cooling system further includes a governor coolant path, which is parallel to each of the liquid branch paths. Isolation valves are respectively provided at the opposite ends of the governor coolant path.

[0014] In one embodiment, a circulation pump is provided in the main liquid path. The circulation pump is used to transport the liquid in the main liquid path to each of the liquid branch paths and to pump the liquid of each of the liquid branch paths back to the main liquid path.

[0015] In one embodiment, a heat exchanger is provided in the liquid branch path. The liquid in the liquid branch path flows through the heat exchanger, and the heat exchanger is used to take away the heat of each of the parts to be processed or transfer the heat to each of the parts to be processed.

[0016] The beneficial effects of the diesel engine cooling system provided by the present application are as follows: By respectively providing a second valve and a first valve at the inlet and outlet of the cooling circuit, the flow direction, on-off or flow rate percentage of the liquid at the inlet and outlet of the cooling circuit can be controlled, so as to prevent the heated liquid in the preheating circuit from flowing into the cooling circuit and causing heat dissipation, or reduce the heat dissipation caused by the heated liquid in the preheating circuit flowing into the cooling circuit, so that the liquid in the main liquid path can be heated to a preset temperature by the preheating circuit to ensure the normal operation of the diesel engine, and at the same time, energy loss can also be reduced. Description of the Drawings

[0017] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0018] Figure 1 Structural schematic diagram of the diesel engine cooling system provided by the embodiment of the present application and provided with a first valve;

[0019] Figure 2 Structural schematic diagram of the diesel engine cooling system provided by the embodiment of the present application without a first valve;

[0020] Figure 3 Structural schematic diagram of the diesel engine cooling system provided by the embodiment of the present application including a governor coolant circuit.

[0021] Among them, each reference numeral in the figure:

[0022] 100, main liquid circuit; 110, first pipeline; 120, second pipeline; 130, third pipeline; 140, fourth pipeline; 150, fifth pipeline; 200, preheating circuit; 210, heating device; 220, liquid driving pump; 230, preheating pipeline; 300, cooling circuit; 310, air cooler; 320, cooling pipeline; 400, second valve; 500, first valve; 600, sub-liquid circuit; 610, heat exchanger; 700, circulation pump; 800, water tank; 900, governor coolant circuit; 910, isolation valve; 1000, governor. Detailed implementation manners

[0023] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0024] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0025] It should be understood that the orientation or positional relationship indicated by terms such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application.

[0026] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality of" means two or more unless otherwise specifically defined.

[0027] A diesel engine is an engine that obtains energy release by burning diesel. When a diesel engine is working, since components such as pistons, cylinders, and cylinder heads are in direct contact with the combustion gas and are strongly heated. In addition, a turbocharger increases the intake air volume of the diesel engine to increase combustion, and a large amount of heat is also generated during its working process. If these components are not properly cooled and the heat is not dissipated in time, it will cause the mechanical properties of the component materials to decline, and adverse effects such as increased thermal stress and thermal deformation of the components will occur. In addition, lubricating oil is an important part to keep the diesel engine working efficiently. A large amount of heat is absorbed when the lubricating oil conducts lubricating friction. If this part of the heat is not dissipated in time, the temperature of the lubricating oil will be reduced, the normal viscosity of the lubricating oil cannot be maintained, and the lubricating oil cannot be recycled. To solve the heat dissipation problem of the diesel engine, a diesel engine cooling system needs to be set up to cool and dissipate heat from the parts to be processed of the diesel engine (i.e., the aforementioned turbocharger and lubricating oil, etc.) to ensure the normal operation of the diesel engine and improve the service life of the diesel engine.

[0028] In addition, when the diesel engine is in a standby state, in order to avoid the parts to be processed of the diesel engine being difficult to start due to being in a low-temperature state for a long time, a preheating device needs to be added to the diesel engine cooling system. However, due to the simultaneous presence of the preheating device and the cooling device, the liquid heated by the preheating device will flow to the cooling device and cause heat loss, which not only causes energy waste but also makes it difficult for the parts to be processed of the diesel engine to start.

[0029] To solve the above problems, an embodiment of the present application provides a diesel engine cooling system. By setting valves at both the inlet and outlet positions of the cooling circuit 300 of the diesel engine cooling system, the valves are used to block or reduce the flow of the liquid in the preheating circuit 200 to the cooling circuit 300, thereby reducing or avoiding the heat dissipation of the liquid in the preheating circuit 200. This not only reduces energy waste but also enables the parts to be processed of the diesel engine to be maintained within a preset temperature range, allowing the diesel engine to start normally.

[0030] Please refer to Figure 1 , and now the diesel engine cooling system provided by the embodiment of the present application will be described. This diesel engine cooling system is used to cool the diesel engine in the operating state and preheat the diesel engine in the standby state to ensure the normal operation of the diesel engine.

[0031] Please refer to Figure 1 , the diesel engine cooling system includes a main liquid path 100, a preheating circuit 200, and a cooling circuit 300. The preheating circuit 200 and the cooling circuit 300 are respectively connected in parallel to the main liquid path 100. The preheating circuit 200 is used to heat the liquid flowing through the main liquid path 100, and the cooling circuit 300 is used to cool the liquid flowing through the main liquid path 100; a first valve 500 for controlling the flow direction, on-off, or percentage of the liquid flow rate is provided at the outlet of the cooling circuit 300, and a second valve 400 for controlling the flow direction, on-off, or percentage of the liquid flow rate is provided at the inlet of the cooling circuit 300.

[0032] Among them, the preheating circuit 200 and the cooling circuit 300 are respectively connected in parallel to the main liquid path 100, which means that along the extension direction of the main liquid path 100, the preheating circuit 200 and the cooling circuit 300 are respectively connected in parallel at different positions of the main liquid path 100. When it is necessary to preheat the liquid in the main liquid path 100, the liquid in the main liquid path 100 is introduced into the preheating circuit 200 and heated, and then the heated liquid is led out to the main liquid path 100; when it is necessary to cool the liquid in the main liquid path 100, the liquid in the main liquid path 100 is introduced into the cooling circuit 300 and cooled, and then the cooled liquid is led out into the main liquid path 100. The liquid heated or cooled in the main liquid path 100 will ultimately be introduced into the parts to be processed of the diesel engine to preheat or cool the parts to be processed of the diesel engine.

[0033] Please refer to Figure 2, if the second valve 400 and the first valve 500 are not provided at the inlet and outlet of the cooling circuit 300, when the preheating circuit 200 is started to heat the liquid, the liquid in the main liquid path 100 will be heated. The heated liquid will expand and flow back, flowing through the main liquid path 100 to the cooling circuit 300, causing the hot and cold liquids to convect, thereby resulting in heat loss. Specifically, at the intersection of the preheating circuit 200 and the cooling circuit 300, due to the flow of the preheated water, it prompts the liquid in the pipeline at the intersection to generate vortices and form forced convection. And the liquid in the cooling circuit 300 is at a lower temperature than the liquid in the preheating circuit 200, thus forming natural convection, which causes the heated liquid to dissipate along the cooling circuit 300. According to actual experience, in cold winter weather (for example, when the temperature is about 10°C), the temperature of the preheated water will be low.

[0034] To solve the above problems, the present application respectively provides the second valve 400 and the first valve 500 at the inlet and outlet of the cooling circuit 300.

[0035] Among them, the second valve 400 is provided at the inlet of the cooling circuit 300. The second valve 400 can be provided in the cooling circuit 300, or the second valve 400 can also be provided at the connection between the cooling circuit 300 and the main liquid path 100.

[0036] The second valve 400 controls the flow direction of the liquid, which means controlling the flow direction of the liquid at the inlet of the cooling circuit 300 through the second valve 400. For example, controlling whether the liquid can flow from the main liquid path 100 to the cooling circuit 300, or controlling whether the liquid can flow from the cooling circuit 300 to the main liquid path 100, or enabling the liquid to flow bidirectionally at the second valve 400. The second valve 400 controls the on / off of the liquid, which means the second valve 400 controls whether the main liquid path 100 is connected to the inlet of the cooling circuit 300. The second valve 400 controls the percentage of the liquid flow rate, which means controlling the percentage of the liquid in the main liquid path 100 flowing to the cooling circuit 300. For example, 90% of the liquid in the main liquid path 100 flows to the cooling circuit 300, and 10% of the liquid flows directly forward and then meets at the outlet of the cooling circuit 300.

[0037] Similarly, the first valve 500 can be provided in the cooling circuit 300, or the first valve 500 can also be provided at the connection between the outlet of the cooling circuit 300 and the main liquid path 100. The first valve 500 can be used to control the flow direction, on / off or the percentage of the liquid flow rate at the outlet of the cooling circuit 300.

[0038] In the diesel engine cooling system according to the embodiments of the present application, by respectively arranging a first valve 500 and a second valve 400 at the outlet and inlet of the cooling circuit 300, the flow direction, on-off or flow rate percentage of the liquid at the inlet and outlet of the cooling circuit 300 can be controlled, so as to prevent the heated liquid in the preheating circuit 200 from flowing to the cooling circuit 300 and causing heat dissipation, or reduce the heat dissipation caused by the heated liquid in the preheating circuit 200 flowing to the cooling circuit 300, so that the liquid in the main liquid path 100 can be heated to a preset temperature by the preheating circuit 200, to ensure the normal operation of the diesel engine and reduce energy loss at the same time.

[0039] In the present application, please refer to Figure 1 , a cooling circuit 300 and a preheating circuit 200 are arranged in parallel in the main liquid path 100. Among them, the cooling circuit 300 is used to cool the parts to be processed in the diesel engine during the use of the diesel engine, so that the diesel engine can continue to operate normally. During the use of the diesel engine, the preheating circuit 200 does not work to avoid the preheating circuit 200 affecting the cooling effect of the cooling circuit 300. When the diesel engine is in a standby state, in order to avoid the cooling circuit 300 continuously cooling the parts to be processed of the diesel engine and causing the parts to be processed of the diesel engine to be unable to start normally due to too low temperature, it is necessary to heat the liquid in the main liquid path 100 through the preheating circuit 200, so that the parts to be processed can be maintained within a certain temperature range to ensure that the diesel engine can be started normally.

[0040] In one embodiment, please refer to Figure 1 , the first valve 500 is a first check valve. The first check valve allows the liquid in the cooling circuit 300 to flow to the main liquid path 100, and the first check valve prevents the liquid in the main liquid path 100 from flowing to the cooling circuit 300. Among them, through the setting of the first check valve, the cooled liquid in the cooling circuit 300 can flow back to the main liquid path 100 through the outlet of the cooling circuit 300 to achieve the purpose of cooling the liquid in the main liquid path 100, while the liquid in the main liquid path 100 cannot flow to the cooling circuit 300 through the outlet of the cooling circuit 300, thus avoiding the convective flow of hot and cold liquids caused by the heated liquid in the main liquid path 100 flowing into the cooling circuit 300, and thus avoiding the possibility of heat dissipation caused by the heated liquid in the main liquid path 100 flowing through the cooling circuit 300.

[0041] In one embodiment, please refer to Figure 1 , the first check valve is installed in the cooling circuit 300 and close to the outlet to prevent the liquid in the main liquid path 100 from flowing into the cooling circuit 300.

[0042] In another embodiment of the present application, the first valve 500 may also be a first on-off valve installed near the outlet in the cooling circuit 300, and the on-off of the liquid at the outlet of the cooling circuit 300 is controlled by the first on-off valve. For example, when the diesel engine is in use, the first on-off valve is connected to make the outlet of the cooling circuit 300 communicate with the main liquid path 100, so that the cooled liquid in the cooling circuit 300 can flow into the main liquid path 100. When the diesel engine is in standby state, the first on-off valve can be disconnected to disconnect the outlet of the cooling circuit 300 from the main liquid path 100, thereby preventing the heated liquid in the main liquid path 100 from flowing into the cooling circuit 300.

[0043] In yet another embodiment of the present application, the first valve 500 is a first flow valve installed near the outlet in the cooling circuit 300, and the liquid flow rate through the first flow valve is controlled by the first flow valve. For example, when the diesel engine is in use, the flow rate of the first flow valve is increased to make the outlet of the cooling circuit 300 communicate with the main liquid path 100 in a normal state. When the diesel engine is in standby state, the flow rate of the first flow valve can be decreased or directly closed, thereby reducing the situation where the heated liquid in the main liquid path 100 flows into the cooling circuit 300.

[0044] In yet another embodiment of the present application, the first valve 500 is a first three-way valve installed at the connection between the outlet of the cooling circuit 300 and the main liquid path 100, and the first three-way valve is used to control whether the liquid in the main liquid path 100 will flow into the cooling circuit 300 through the outlet of the cooling circuit 300, or to control the percentage of the liquid flow rate flowing into the cooling circuit 300, thereby avoiding or reducing the possibility of heat dissipation.

[0045] In one embodiment, please refer to Figure 1 , the second valve 400 is a second three-way valve installed at the connection between the inlet of the cooling circuit 300 and the main liquid path 100, and the second three-way valve is used to control whether the liquid in the main liquid path 100 will flow into the cooling circuit 300 through the inlet of the cooling circuit 300, or to control the percentage of the liquid flow rate flowing into the cooling circuit 300, thereby avoiding or reducing the possibility of heat dissipation.

[0046] Specifically, please refer to Figure 1, the main liquid path 100 includes a first pipeline 110, a second pipeline 120, and a third pipeline 130 connected in sequence. The cooling circuit 300 is connected in parallel to the second pipeline 120. The first pipeline 110 is used to connect to a liquid source, and the third pipeline 130 is used to transport the cooled liquid to the part to be processed of the diesel engine to cool the part to be processed. The second three-way valve has a first interface, a second interface, and a third interface. The first interface is connected to the first pipeline 110, the second interface is connected to the second pipeline 120, and the third interface is connected to the inlet of the cooling circuit 300. The second three-way valve is a common and commonly used three-way valve. A valve core is provided inside the second three-way valve, and the position of the valve core in the second three-way valve is controlled by an external hydraulic driving force, pneumatic force, or electric power to achieve the connection state and flow rate of the first interface, the second interface, and the third interface.

[0047] Specifically, in this embodiment, when the diesel engine is in use, the position of the valve core can be controlled so that 90% of the liquid in the first pipeline 110 flows to the cooling circuit 300 to be cooled, 10% flows to the second pipeline 120, and then 90% of the cooled liquid and 10% of the uncooled liquid meet at the connection between the third pipeline 130 and the second pipeline 120 to reach the preset cooling temperature. When the diesel engine is in standby, the position of the valve core can be controlled so that the first pipeline 110 is 100% connected to the second pipeline 120, and neither the first pipeline 110 nor the second pipeline 120 is connected to the inlet of the cooling circuit 300, thereby preventing the heated liquid in the second pipeline 120 from flowing into the cooling circuit 300 through the inlet of the cooling circuit 300, thereby reducing heat dissipation.

[0048] In this embodiment, through the setting of the second three-way valve, not only can the liquid flow control of the first pipeline 110, the second pipeline 120, and the cooling circuit 300 be realized, but also the cooling effect and heat dissipation reduction can be achieved. It can be understood that in other embodiments of the present application, the position of the valve core can also be controlled so that during the use of the diesel engine, all the liquid in the first pipeline 110 flows to the cooling circuit 300 for cooling, and during the standby state of the diesel engine, all the liquid in the first pipeline 110 flows to the second pipeline 120. Or, in other embodiments, the ratio can also be adjusted, and there is no unique limitation here.

[0049] In one embodiment, please refer to Figure 1 , the outlets of the second pipeline 120, the third pipeline 130, and the cooling circuit 300 are connected through a first connector (not shown in the figure). The first connector can be a Y-shaped pipeline connector so that the second pipeline 120, the third pipeline 130, and the cooling circuit 300 are all in a connected state.

[0050] In other embodiments of the present application, the second valve 400 may also be a second check valve, a second on-off valve or a second flow valve installed near the inlet of the cooling circuit 300, and the flow direction, on-off or flow rate percentage of the liquid at the inlet of the cooling circuit 300 may be controlled to avoid or reduce the heated liquid in the main liquid circuit 100 from flowing into the cooling circuit 300. For example, when the second valve 400 is a second check valve, the second check valve may not work when the diesel engine is in use, so that the liquid in the main liquid circuit 100 can flow into the cooling circuit 300 for cooling; when the diesel engine is in standby mode, the second check valve is activated to prevent the liquid in the main liquid circuit 100 from flowing into the cooling circuit 300.

[0051] In one embodiment, see Figures 1 to 3 The cooling circuit 300 is provided with an air cooler 310, which is a heat exchange device that uses air to cool the hot fluid. It achieves the cooling purpose by exchanging heat between the hot fluid in the tube and the air outside the tube. The air cooler 310 has the following advantages: no need to directly use water as the cooling medium, reducing the cost and environmental impact related to the water source; low maintenance cost, because there is no need to frequently clean scale and microbial deposition; limited heat exchange capacity can be maintained by natural wind when the power fails; flexible control of the outlet temperature of the medium fluid; large footprint, but it can be overcome by reasonable layout. However, the total heat dissipation area of ​​the air cooler 310 is as high as nearly 2000 square meters, thus forming a strong heat dissipation effect. Actual measurements show that when the external ambient temperature is low (10°C), the heat dissipation intensity formed by the air cooler 310 is nearly 60% of the power of the electric heater in the preheating circuit 200. Therefore, it is necessary to prevent the liquid in the preheating circuit 200 from flowing into the cooling circuit 300 to cause heat loss. It can be understood that in other embodiments of the present application, the above-mentioned cooling circuit 300 can also cool the liquid through other cooling equipment, such as a shell and tube cooler, a corrugated plate cooler, an air-cooled cooler, an oil cooler, a liquid cooler, a plate cooler and a heat exchanger.

[0052] In one embodiment, see Figures 1 to 3 The cooling circuit 300 also includes a cooling pipeline 320, the opposite ends of the cooling pipeline 320 are respectively connected to the opposite ends of the second pipeline 120, and the air cooler 310 is installed in the flow path of the cooling pipeline 320. The liquid in the cooling pipeline 320 flows through the air cooler 310 and is cooled by the air cooler 310.

[0053] In one embodiment, see Figures 1 to 3, a heating device 210 and a liquid driving pump 220 are provided in the preheating circuit 200. The liquid driving pump 220 is used to pump the liquid in the main liquid path 100 into the preheating circuit 200, and the heating device 210 is used to heat the liquid in the preheating circuit 200. Among them, the setting of the liquid driving pump 220 enables the liquid driving pump 220 to be started when the diesel engine is in a standby state, so as to pump the liquid in the main liquid path 100 into the preheating circuit 200 for the heating device 210 to heat, and at the same time pump the heated liquid in the preheating circuit 200 back into the main liquid path 100 to ensure that the liquid can flow into the preheating circuit 200 for heating. It can be understood that in other embodiments of the present application, when a third three-way valve is connected in the preheating circuit 200 and the main liquid path 100, the flow of the liquid can also be controlled by the third three-way valve. In this case, the fluid driving pump may not be provided, and this is not uniquely limited here.

[0054] In one embodiment, please refer to Figures 1 to 3 , the main liquid path 100 further includes a fourth pipeline 140 and a fifth pipeline 150. The preheating circuit 200 is connected in parallel with the fourth pipeline 140, and the fourth pipeline 140 is connected between the third pipeline 130 and the fifth pipeline 150. The intersections of the third pipeline 130, the fourth pipeline 140 and the preheating circuit 200 are connected through a second three-way connector, and the outlets of the fourth pipeline 140, the fifth pipeline 150 and the preheating circuit 200 are connected through a third connecting connector.

[0055] In one embodiment, please refer to Figures 1 to 3 , the preheating circuit 200 further includes a preheating pipeline 230. The opposite ends of the preheating pipeline 230 are respectively connected to the opposite ends of the fourth pipeline 140, and the heating device 210 and the liquid driving pump 220 are respectively installed in the preheating pipeline 230.

[0056] In one embodiment, the heating device 210 is a cooling water electric heater. The cooling water electric heater is a device for heating gas or liquid media. It usually uses electric heating elements as the heating source and transfers heat to the fluid to be heated through electricity. It can be understood that in other embodiments of the present application, the above heating device 210 can also be of other types, such as an oven or a thermal radiation heating device 210, etc.

[0057] In one embodiment, please refer to Figures 1 to 3, the diesel engine cooling system further includes at least two parallel liquid distribution paths 600. The main liquid path 100 is used to transport cooling liquid or preheating liquid to each liquid distribution path 600, and the liquid in the liquid distribution path 600 flows through the part to be processed to cool or preheat the part to be processed. In this embodiment, through the setting of at least two parallel liquid distribution paths 600, the cooling liquid or preheating liquid in the same main liquid path 100 can be respectively transported to each liquid distribution path 600 to cool and preheat different parts to be processed of the diesel engine, without setting different cooling systems for different parts to be processed of the diesel engine, thus saving costs.

[0058] Among them, the part to be processed refers to the part of the diesel engine that needs to be cooled, such as the engine body of the diesel engine, the turbocharger, and the lubricating oil part.

[0059] In one embodiment, please refer to Figures 1 to 3 , the diesel engine cooling system includes three liquid distribution paths 600, and the three liquid distribution paths 600 are respectively used to cool three parts of the engine body of the diesel engine, the turbocharger, and the lubricating oil. It can be understood that in other embodiments of the present application, the number of the liquid distribution paths 600 can also be two, three, four, five or more than five. Each liquid distribution path 600 can flow through two, three or four parts of the engine body of the diesel engine, the turbocharger, and the lubricating oil. In addition, according to the actual application scenario, other parts in the diesel engine system can also be cooled, which is not uniquely limited here.

[0060] In one embodiment, the liquid distribution path 600 is detachably connected to the main liquid path 100. In this way, multiple liquid distribution paths 600 can be connected to the main liquid path 100 according to actual needs, and before use, one or more liquid distribution paths 600 can also be added or reduced on site.

[0061] In one embodiment of the present application, the liquid distribution path 600 is fixedly installed in the main liquid path 100. When an additional liquid distribution path 600 is needed, an additional matching connector is required to add the liquid distribution path 600.

[0062] In one embodiment, please refer to Figures 1 to 3 , a heat exchanger 610 is provided in the liquid distribution path 600, and the liquid in the liquid distribution path 600 flows through the heat exchanger 610. The heat exchanger 610 is used to take away the heat of each part to be processed or transfer the heat to each part to be processed. Among them, through the setting of the heat exchanger 610, the heat exchanger 610 can be connected to each part to be processed, without directly connecting each part to be processed to the liquid distribution path 600.

[0063] In addition, a governor 1000 is also included in the diesel engine system. The governor 1000 automatically increases or decreases the fuel supply of the fuel injection pump according to the change of the diesel engine load, so that the diesel engine can operate at a stable speed. Different models of governors 1000 are used in different application scenarios. For example, when using the governor 1000 of the 501 / 502RG model (501 / 502 represents different product series, and RG represents a specific product line and configuration), the governor 1000 will be heated to a relatively high temperature. If heat dissipation is not timely, it will affect the working performance of the governor 1000.

[0064] To solve the above problems, please refer to Figure 3 , the diesel engine cooling system further includes a governor coolant path 900. The governor coolant path 900 is connected in parallel with the distribution path 600. Isolation valves 910 are respectively provided at opposite ends of the governor coolant path 900. Among them, the governor coolant path 900 is used to cool down the governor 1000 to ensure the working performance of the governor 1000. At the same time, the setting of the isolation valves 910 enables users to selectively use the governor coolant path 900 according to the model of the governor 1000 on site, and the setting of the isolation valves 910 also facilitates the maintenance of the governor 1000.

[0065] In one embodiment, please refer to Figures 1 to 3 , a circulation pump 700 is provided in the main liquid path 100. The inlet of the distribution path 600 is connected to the outlet of the main liquid path 100, and the outlet of the distribution path 600 is connected to the inlet of the main liquid path 100. The cooling liquid or preheating liquid in the main liquid path 100 is pumped into the distribution path 600 through the circulation pump 700, and the liquid flowing through each part to be processed is pumped back into the main liquid path 100 through the circulation pump 700 to realize liquid path circulation and the recycling of liquid, reducing resource waste.

[0066] In one embodiment, please refer to Figures 1 to 3 , the diesel engine cooling system further includes a water tank 800. The inlet of the main liquid path 100 is communicated with the water tank 800. The water tank 800 is used to provide the liquid required in the diesel engine cooling system. In addition, the water tank 800 is also used to supply liquid in time when a part of the liquid in the main liquid path 100 and the distribution path 600 is consumed, so that the diesel engine cooling system can continue to work.

[0067] Optionally, the water tank 800 is arranged at a position relatively higher than the main liquid path 100, so that the liquid in the water tank 800 can flow to the main liquid path 100 under its own gravity. It can be understood that in other embodiments, the water tank 800 can also be arranged at a lower position. At this time, a hydraulic pump can be used to pump the liquid in the water tank 800 into the main liquid path 100, which is not limited uniquely here.

[0068] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A diesel engine cooling system, characterized in that, It includes a main liquid path, a preheating circuit, and a cooling circuit. The preheating circuit and the cooling circuit are respectively connected in parallel to the main liquid path. The preheating circuit is used to heat the liquid flowing through the main liquid path, and the cooling circuit is used to cool the liquid flowing through the main liquid path. A first valve for controlling the flow direction, on-off, or flow rate percentage of the liquid is provided at the outlet of the cooling circuit, and a second valve for controlling the flow direction, on-off, or flow rate percentage of the liquid is provided at the inlet of the cooling circuit.

2. The diesel engine cooling system according to claim 1, wherein, The first valve is a first check valve. The first check valve allows the liquid in the cooling circuit to flow into the main liquid path, and the first check valve prevents the liquid in the main liquid path from flowing into the cooling circuit.

3. The diesel engine cooling system according to claim 1, characterized in that, The first valve is a first on-off valve or a first flow valve installed near the outlet in the cooling circuit; Alternatively, the first valve is a first three-way valve installed at the connection between the outlet of the cooling circuit and the main liquid path.

4. The diesel engine cooling system according to claim 1, characterized in that, The second valve is a second three-way valve installed at the connection between the inlet of the cooling circuit and the main liquid path; Alternatively, the second valve is a second check valve, a second on-off valve, or a second flow valve installed near the inlet in the cooling circuit.

5. The diesel engine cooling system according to any one of claims 1 to 4, characterized in that, An air cooler is provided in the cooling circuit.

6. The diesel engine cooling system according to any one of claims 1 to 4, characterized in that, A heating device and a liquid driving pump are provided in the preheating circuit. The liquid driving pump is used to pump the liquid in the main liquid path into the preheating circuit, and the heating device is used to heat the liquid in the preheating circuit.

7. The diesel engine cooling system according to any one of claims 1 to 4, characterized in that The diesel engine cooling system further includes at least two mutually parallel sub-liquid paths. The main liquid path transports cooling liquid or preheating liquid to each of the sub-liquid paths respectively, and the sub-liquid path flows through the parts to be processed of the diesel engine to cool or preheat the parts to be processed.

8. The diesel engine cooling system according to claim 7, characterized in that, The diesel engine cooling system further includes a governor coolant path. The governor coolant path is connected in parallel with each of the sub-liquid paths, and isolation valves are respectively provided at the opposite ends of the governor coolant path.

9. The diesel engine cooling system according to claim 7, characterized in that, A circulation pump is provided in the main liquid path. The circulation pump is used to transport the liquid in the main liquid path to each of the sub-liquid paths and to pump the liquid from each of the sub-liquid paths back to the main liquid path.

10. The diesel engine cooling system according to claim 7, characterized in that, A heat exchanger is provided in the sub-liquid path. The liquid in the sub-liquid path flows through the heat exchanger, and the heat exchanger is used to take away the heat of each of the parts to be processed or transfer the heat to each of the parts to be processed.

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