A water-cooling and air-cooling combined cooling system
By using a combined water-cooling and air-cooling system, which integrates air-cooled radiators and water-cooled plate heat exchangers, the problem of high water consumption and high cost for diesel engine cooling in high-temperature and water-scarce areas has been solved, achieving efficient cooling and reducing equipment costs.
Patent Information
- Application Number
- CN202522695048.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-19
- Publication Date
- 2026-11-03
- Estimated Expiration
- 2035-12-19
AI Technical Summary
In areas with high temperatures and water scarcity, traditional diesel engine cooling methods suffer from high water consumption and high costs, while traditional air-cooling methods have poor cooling effects and high equipment costs.
The system employs a combined water-cooling and air-cooling cooling system, including an air-cooled radiator and a water-cooled plate heat exchanger. It connects to the diesel engine's high-temperature water and lubricating oil outlets via pipelines, achieving a combination of air-cooling and water-cooling.
It reduces water consumption, lowers costs, and alleviates the problem of high water costs in arid regions, while also improving cooling efficiency and reducing equipment costs.
Smart Images
Figure CN224931741U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of diesel engine cooling technology, and more specifically, to a combined water-cooling and air-cooling cooling system. Background Technology
[0002] For diesel engine cooling needs in high-temperature and water-scarce regions, conventional cooling methods have significant technical and economic drawbacks, as detailed below: In arid desert and Gobi regions such as Pakistan and Iraq, where summer temperatures can reach 50°C, water resources are severely scarce, and diesel engine cooling faces the challenge of cooling down under the dual conditions of high temperature and water shortage.
[0003] If conventional cooling tower water cooling technology is used, the cost of cooling water replenishment is high due to the scarcity of local water resources, resulting in excessively high power plant operation and maintenance costs. If conventional air-cooling technology is used, there is a significant bottleneck in heat dissipation efficiency: when the ambient temperature reaches 44℃, the air-cooled island alone cannot cool the diesel engine lubricating oil to the required temperature; and when the ambient temperature exceeds 35℃, the temperature difference between the hot and cold media is too small, resulting in poor heat exchange. In order to meet the heat dissipation requirements, the heat exchange area and equipment specifications of the air-cooled island need to be greatly increased, which leads to a significant increase in the manufacturing cost of the air-cooled island.
[0004] In summary, when cooling diesel engines in hot and water-scarce regions, traditional water cooling methods suffer from high water consumption and high costs, while traditional air cooling methods suffer from poor cooling performance and high equipment costs. Utility Model Content
[0005] The present invention aims to provide a combined water-cooling and air-cooling cooling system to solve the problems of high water consumption and high cost of traditional water-cooling towers and poor cooling effect and high equipment cost of traditional air-cooling methods when cooling diesel engines in high-temperature and water-scarce areas.
[0006] This utility model is achieved using the following technical solution: This utility model provides a water-cooled and air-cooled composite cooling system, including an air-cooled radiator. One end of the air-cooled radiator is connected to the high-temperature water outlet of the diesel engine through a pipeline, and the other end of the air-cooled radiator is connected to one end of a high-temperature water plate heat exchanger through a pipeline. The high-temperature water plate heat exchanger is a water-cooled plate heat exchanger, and the other end of the high-temperature water plate heat exchanger is connected to the high-temperature water return port of the diesel engine. It also includes a primary plate heat exchanger for lubricating oil and a secondary plate heat exchanger for lubricating oil. Both the primary and secondary plate heat exchangers for lubricating oil are water-cooled plate heat exchangers. One end of the primary plate heat exchanger for lubricating oil is connected to the diesel engine lubricating oil outlet via a pipeline, and the other end of the primary plate heat exchanger for lubricating oil is connected to one end of the secondary plate heat exchanger for lubricating oil via a pipeline. The other end of the secondary plate heat exchanger for lubricating oil is connected to the diesel engine lubricating oil return port.
[0007] This invention adopts a combination of air cooling and water cooling. Compared with the traditional water cooling method of cooling towers, this invention reduces water consumption and lowers costs, effectively improving the problems of high water costs and excessive power plant operation and maintenance costs in arid areas. Compared with the traditional air cooling method, the combined air cooling and water cooling method of this invention has better cooling effect, reduces equipment costs, and solves the problem of significantly increased manufacturing costs of air-cooled islands when the ambient temperature exceeds 35°C.
[0008] As a preferred technical solution: The high-temperature water plate heat exchanger is provided with a high-temperature water channel and a cooling water channel. The high-temperature water channel is used for passing high-temperature water that has been cooled by the air-cooled radiator. The cooling water channel is used for passing cooling water. The high-temperature water channel and the cooling water channel are arranged adjacent to each other.
[0009] As a preferred technical solution: The inlet end of the high-temperature water channel is arranged in the opposite direction to the inlet end of the cooling water channel.
[0010] As a preferred technical solution: The water-cooled and air-cooled combined cooling system also includes a cooling water supply system, which comprises a circulating water tank, a water supply pump, a cooling tower, and a spray pump. The circulating water tank stores cooling water. One end of the water supply pump is connected to the circulating water tank via a pipeline, and the water supply pump is used to pump the cooling water out of the circulating water tank. The other end of the water supply pump is connected to the inlet end of the cooling water channel of the high-temperature water plate heat exchanger via a pipeline. The outlet end of the cooling water channel of the high-temperature water plate heat exchanger is connected to the cooling coil in the cooling tower via a pipeline. The cooling coil is connected to the circulating water tank via a pipeline. The spray pump is used to pump water from the cooling tower base to the surface of the cooling coil to cool the cooling coil.
[0011] As a preferred technical solution: Valves are installed at both the inlet and outlet ends of the high-temperature water channel, and valves are also installed at both the inlet and outlet ends of the cooling water channel of the high-temperature water plate heat exchanger. The high-temperature water plate heat exchanger is connected in parallel with a high-temperature water bypass pipe, and a valve is also installed on the high-temperature water bypass pipe.
[0012] As a preferred technical solution: Both the primary and secondary plate heat exchangers for lubricating oil are provided with lubricating oil channels and cooling water channels. The lubricating oil channels are used for passing lubricating oil to be cooled, and the cooling water channels are used for passing cooling water. The lubricating oil channels and the cooling water channels are arranged adjacent to each other.
[0013] As a preferred technical solution: The inlet end of the lubricating oil passage is arranged in the opposite direction to the inlet end of the cooling water passage.
[0014] As a preferred technical solution: The inlet end of the cooling water channel of the primary plate heat exchanger for lubricating oil is connected to the low-temperature water outlet of the diesel engine via a pipeline, and the outlet end of the cooling water channel of the primary plate heat exchanger for lubricating oil is connected to the low-temperature water air cooler via a pipeline. The low-temperature water air cooler is connected to the low-temperature water return port of the diesel engine via a pipeline.
[0015] As a preferred technical solution: The other end of the water supply pump is connected to the inlet end of the cooling water channel of the two-stage plate heat exchanger for lubricating oil via a pipeline, and the outlet end of the cooling water channel of the two-stage plate heat exchanger for lubricating oil is connected to the cooling coil.
[0016] As a preferred technical solution: The cooling tower is a closed-loop cooling tower with cooling coils installed inside. These coils are used to carry the cooled water after heat exchange. A spray pump brings water from the cooling tower base to the surface of the cooling coils, cooling the coils and consequently the cooled water inside. This effectively reduces scaling on the plate heat exchanger and minimizes water evaporation loss.
[0017] As a preferred technical solution: The outlet end of the cooling water channel of the lubricating oil secondary plate heat exchanger is also connected to the inlet end of the cooling water channel of the high-temperature water plate heat exchanger.
[0018] As a preferred technical solution: Valves are installed at both the inlet and outlet ends of the lubricating oil passage, and valves are also installed at both the inlet and outlet ends of the cooling water passages of the primary and secondary lubricating oil plate heat exchangers. The primary plate heat exchanger and the secondary plate heat exchanger for lubricating oil are each connected in parallel with a lubricating oil bypass pipe, and a valve is also installed on the lubricating oil bypass pipe.
[0019] As a preferred technical solution: A valve is installed between the water supply pump and the inlet end of the cooling water channel of the two-stage plate heat exchanger for lubricating oil, and a valve is installed between the outlet end of the cooling water channel of the two-stage plate heat exchanger for lubricating oil and the cooling tower. A valve is installed between the water supply pump and the inlet end of the cooling water channel of the high-temperature water plate heat exchanger, and a valve is installed between the outlet end of the cooling water channel of the high-temperature water plate heat exchanger and the cooling tower. A valve is installed on the cooling water bypass pipe of the lubricating oil secondary plate heat exchanger, and a valve is installed on the cooling water bypass pipe of the high-temperature water plate heat exchanger. The cooling water bypass pipe of the lubricating oil secondary plate heat exchanger is connected to the inlet end of the cooling water channel of the high-temperature water plate heat exchanger.
[0020] As a preferred technical solution: Specifically, a valve is installed between the outlet end of the cooling water channel of the two-stage plate heat exchanger and the cooling tower.
[0021] A valve is installed between the outlet end of the cooling water channel of the high-temperature water plate heat exchanger and the cooling tower. Specifically, a valve is installed between the outlet end of the cooling water channel of the high-temperature water plate heat exchanger and the cooling coil.
[0022] As a preferred technical solution: The valve may be, but is not limited to, a butterfly valve.
[0023] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are: This invention adopts a combination of air cooling and water cooling. Compared with the traditional water cooling method of cooling towers, this invention reduces water consumption and lowers costs, effectively improving the problems of high water costs and excessive power plant operation and maintenance costs in arid areas. Compared with the traditional air cooling method, the combined air cooling and water cooling method of this invention has better cooling effect, reduces equipment costs, and solves the problem of significantly increased manufacturing costs of air-cooled islands when the ambient temperature exceeds 35°C. Attached Figure Description
[0024] Figure 1 This is a schematic diagram of the water-cooled and air-cooled combined cooling system of this utility model.
[0025] Icons: 1-Air-cooled radiator, 2-High-temperature water plate heat exchanger, 3-Lubricating oil primary plate heat exchanger, 4-Lubricating oil secondary plate heat exchanger, 5-Cooling tower, 6-High-temperature water, 7-Low-temperature water, 8-Lubricating oil, 9-External circulating water, 10-Circulating water tank, 11-Water supply pump, 12-Spray pump, 13-Low-temperature water air cooler, 14-Diesel engine, 15-Lubricating oil bypass pipe, 16-Butterfly valve, 17-High-temperature water bypass pipe. Detailed Implementation
[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0027] Example 1 like Figure 1 As shown, this embodiment proposes a water-cooled and air-cooled composite cooling system, including an air-cooled radiator 1. One end of the air-cooled radiator 1 is connected to the high-temperature water outlet of the diesel engine 14 through a pipeline. The air-cooled radiator 1 is used to perform primary cooling of the high-temperature water 6. After the high-temperature water 6 comes out of the high-temperature water outlet of the diesel engine 14, it first enters the air-cooled radiator 1 and is cooled by the air-cooled radiator 1.
[0028] The other end of the air-cooled radiator 1 is connected to one end of the high-temperature water plate heat exchanger 2 through a pipeline. The high-temperature water plate heat exchanger 2 is a water-cooled plate heat exchanger. The high-temperature water plate heat exchanger 2 performs secondary cooling on the high-temperature water 6 after the primary cooling by the air-cooled radiator 1 through water cooling. The other end of the high-temperature water plate heat exchanger 2 is connected to the high-temperature water return port of the diesel engine 14, so that the high-temperature water 6 after two coolings re-enters the diesel engine 14.
[0029] Preferably, the high-temperature water plate heat exchanger 2 is provided with a high-temperature water channel and a cooling water channel. The high-temperature water channel is used for passing high-temperature water 6 after primary cooling by the air-cooled radiator 1, and the cooling water channel is used for passing cooling water. The high-temperature water channel and the cooling water channel are arranged adjacent to each other, and heat exchange occurs between the cooling water and the high-temperature water 6. The cooling water absorbs the heat from the high-temperature water 6, thereby performing secondary cooling on the high-temperature water 6.
[0030] Preferably, the inlet end of the high-temperature water channel is arranged in opposite directions to the inlet end of the cooling water channel, that is, the inlet end of the high-temperature water channel and the inlet end of the cooling water channel are located on different sides, so as to realize convective heat exchange between the cooling water and the high-temperature water 6, improve the cooling efficiency, and realize the rapid cooling of the high-temperature water 6.
[0031] Preferably, the water-cooled and air-cooled combined cooling system further includes a cooling water supply system. This system comprises a circulating water tank 10, a water supply pump 11, a cooling tower 5, and a spray pump 12. The circulating water tank 10 stores cooling water. One end of the water supply pump 11 is connected to the circulating water tank 10 via a pipeline, and the pump 11 pumps the cooling water from the tank. The other end of the pump 11 is connected to the high-temperature water plate heat exchanger 2 via a pipeline. Specifically, the other end of the pump 11 is connected to the inlet of the cooling water channel of the high-temperature water plate heat exchanger 2 via a pipeline. Thus, the cooling water from the circulating water tank 10 can be pumped to the high-temperature water plate heat exchanger 2 via the pump 11 for secondary cooling of the high-temperature water 6. The outlet of the cooling water channel of the high-temperature water plate heat exchanger 2 is connected to the cooling tower 5 via a pipeline, and the cooling tower 5 cools the water after heat exchange. The cooling tower 5 is connected to the circulating water tank 10 via a pipeline, and the cooled water enters the circulating water tank 10 for storage after being cooled.
[0032] The cooling tower 5 is a closed-loop cooling tower. A cooling coil is installed inside the cooling tower 5. The cooling coil is used to carry the cooled water after heat exchange. The outlet end of the cooling water channel of the high-temperature water plate heat exchanger 2 is connected to the cooling coil through a pipeline. The cooling coil is connected to the circulating water tank 10 through a pipeline. The spray pump 12 is installed inside the cooling tower 5. The spray pump 12 is used to bring the water from the cooling tower base to the surface of the cooling coil to cool the cooling coil, thereby cooling the cooling water inside the cooling coil.
[0033] Preferably, butterfly valves 16 are installed at both the inlet and outlet ends of the high-temperature water channel, and butterfly valves 16 are installed at both the inlet and outlet ends of the cooling water channel of the high-temperature water plate heat exchanger 2.
[0034] Preferably, the high-temperature water plate heat exchanger 2 is connected in parallel with a high-temperature water bypass pipe 17, and a butterfly valve 16 is also installed on the high-temperature water bypass pipe 17.
[0035] When the ambient temperature is low and the temperature of the high-temperature water 6 is sufficient to meet the required temperature through the primary cooling of the air-cooled radiator 1, or when the high-temperature water plate heat exchanger 2 needs maintenance, the butterfly valves 16 at the inlet and outlet of the high-temperature water channel are closed, the butterfly valves 16 at the inlet and outlet of the cooling water channel are closed, and the butterfly valve 16 on the high-temperature water bypass pipe 17 is opened, so that the high-temperature water 6 passes through the high-temperature water bypass pipe 17.
[0036] The combined water-cooled and air-cooled cooling system also includes a primary plate heat exchanger 3 and a secondary plate heat exchanger 4 for lubricating oil. Both the primary plate heat exchanger 3 and the secondary plate heat exchanger 4 are water-cooled plate heat exchangers. One end of the primary plate heat exchanger 3 is connected to the lubricating oil outlet of the diesel engine 14 via a pipeline, and the other end of the primary plate heat exchanger 3 is connected to one end of the secondary plate heat exchanger 4 via a pipeline. The other end of the secondary plate heat exchanger 4 is connected to the lubricating oil return port of the diesel engine 14.
[0037] The lubricating oil primary plate heat exchanger 3 and the lubricating oil secondary plate heat exchanger 4 are cooled by water cooling, and the lubricating oil 8 after two cooling cycles re-enters the diesel engine 14.
[0038] Both the primary plate heat exchanger 3 and the secondary plate heat exchanger 4 are equipped with lubricating oil channels and cooling water channels. The lubricating oil channels are used for the passage of lubricating oil 8 to be cooled, and the cooling water channels are used for the passage of cooling water. The lubricating oil channels and the cooling water channels are arranged adjacent to each other, and heat exchange is carried out between the cooling water and the lubricating oil 8. The cooling water absorbs the heat of the lubricating oil 8, thereby performing secondary cooling of the lubricating oil 8.
[0039] Preferably, the inlet end of the lubricating oil channel is arranged in opposite directions to the inlet end of the cooling water channel, that is, the inlet end of the lubricating oil channel and the inlet end of the cooling water channel are located on different sides, so as to realize convective heat exchange between the cooling water and the lubricating oil 8, improve the cooling efficiency, and realize the rapid cooling of the lubricating oil 8.
[0040] Preferably, the inlet end of the cooling water channel of the primary plate heat exchanger 3 is connected to the low-temperature water outlet of the diesel engine 14 via a pipeline. The low-temperature water 7 in the diesel engine 14 performs primary cooling on the lubricating oil 8 entering the lubricating oil channel of the primary plate heat exchanger 3. The outlet end of the cooling water channel of the primary plate heat exchanger 3 is connected to the low-temperature water air cooler 13 via a pipeline. The low-temperature water air cooler 13 is connected to the low-temperature water return port of the diesel engine 14 via a pipeline. After the low-temperature water 7 has completed heat exchange with the lubricating oil 8, it is cooled by the low-temperature water air cooler 13 and then returns to the diesel engine 14.
[0041] Preferably, the other end of the water supply pump 11 is connected to the lubricating oil secondary plate heat exchanger 4 via a pipeline. Specifically, the other end of the water supply pump 11 is connected to the inlet end of the cooling water channel of the lubricating oil secondary plate heat exchanger 4 via a pipeline. In this way, the cooling water in the circulating water tank 10 can be pumped to the lubricating oil secondary plate heat exchanger 4 by the water supply pump 11 to perform secondary cooling of the lubricating oil 8. The outlet end of the cooling water channel of the lubricating oil secondary plate heat exchanger 4 is connected to the cooling tower 5, specifically, to the cooling coil.
[0042] Preferably, the outlet end of the cooling water channel of the lubricating oil secondary plate heat exchanger 4 is also connected to the inlet end of the cooling water channel of the high-temperature water plate heat exchanger 2, so that the cooling water after the lubricating oil 8 is cooled for the second time can also be used as the cooling water source for the high-temperature water 6 to be cooled for the second time.
[0043] Preferably, butterfly valves 16 are installed at the inlet and outlet ends of the lubricating oil channels of the primary plate heat exchanger 3 and the secondary plate heat exchanger 4, and butterfly valves 16 are also installed at the inlet and outlet ends of the cooling water channels of the primary plate heat exchanger 3 and the secondary plate heat exchanger 4.
[0044] Preferably, the primary plate heat exchanger 3 and the secondary plate heat exchanger 4 are each connected in parallel with a lubricating oil bypass pipe 15, and a butterfly valve 16 is also installed on the lubricating oil bypass pipe 15. This is to accommodate situations where a single plate heat exchanger is used to cool the lubricating oil 8, or when the plate heat exchanger needs to be repaired.
[0045] Preferably, a butterfly valve 16 is provided between the water supply pump 11 and the inlet end of the cooling water channel of the lubricating oil secondary plate heat exchanger 4, and a butterfly valve 16 is provided between the outlet end of the cooling water channel of the lubricating oil secondary plate heat exchanger 4 and the cooling tower 5. A butterfly valve 16 is provided between the water supply pump 11 and the inlet end of the cooling water channel of the high-temperature water plate heat exchanger 2, and a butterfly valve 16 is provided between the outlet end of the cooling water channel of the high-temperature water plate heat exchanger 2 and the cooling tower 5. A butterfly valve 16 is installed on the cooling water bypass pipe of the lubricating oil secondary plate heat exchanger 4, and a butterfly valve 16 is installed on the cooling water bypass pipe of the high temperature water plate heat exchanger 2. The cooling water bypass pipe of the lubricating oil secondary plate heat exchanger 4 is connected to the inlet end of the cooling water channel of the high-temperature water plate heat exchanger 2, so that cooling water can enter the high-temperature water plate heat exchanger 2 from the cooling water bypass pipe of the lubricating oil secondary plate heat exchanger 4.
[0046] With the above structural design, when secondary cooling of the lubricating oil 8 is required but secondary cooling of the high-temperature water 6 is not required, the butterfly valve 16 on the cooling water bypass pipe of the lubricating oil secondary plate heat exchanger 4 is closed, the butterfly valve 16 between the water supply pump 11 and the inlet end of the cooling water channel of the lubricating oil secondary plate heat exchanger 4 is opened, the butterfly valve 16 between the outlet end of the cooling water channel of the lubricating oil secondary plate heat exchanger 4 and the cooling tower 5 is opened, and the cooling water bypass of the high-temperature water plate heat exchanger 2 is opened. The butterfly valve 16 on the pipe is closed, between the water supply pump 11 and the inlet end of the cooling water channel of the high-temperature water plate heat exchanger 2, and between the outlet end of the cooling water channel of the high-temperature water plate heat exchanger 2 and the cooling tower 5, so that the cooling water enters the lubricating oil secondary plate heat exchanger 4 to perform secondary cooling on the lubricating oil 8, and flows from the cooling water bypass pipe of the high-temperature water plate heat exchanger 2 to the cooling tower 5, and the cooling water does not enter the high-temperature water plate heat exchanger 2.
[0047] When secondary cooling of the lubricating oil 8 is not required, but secondary cooling of the high-temperature water 6 is needed, open the butterfly valve 16 on the cooling water bypass pipe of the lubricating oil secondary plate heat exchanger 4, close the butterfly valve 16 between the water supply pump 11 and the inlet end of the cooling water channel of the lubricating oil secondary plate heat exchanger 4, close the butterfly valve 16 between the outlet end of the cooling water channel of the lubricating oil secondary plate heat exchanger 4 and the cooling tower 5, close the butterfly valve 16 on the cooling water bypass pipe of the high-temperature water plate heat exchanger 2, open the butterfly valve 16 between the water supply pump 11 and the inlet end of the cooling water channel of the high-temperature water plate heat exchanger 2, and open the butterfly valve 16 between the outlet end of the cooling water channel of the high-temperature water plate heat exchanger 2 and the cooling tower 5, so that the cooling water enters the high-temperature water plate heat exchanger 2 through the cooling water bypass pipe of the lubricating oil secondary plate heat exchanger 4 to perform secondary cooling of the high-temperature water 6. At this time, the cooling water does not enter the lubricating oil secondary plate heat exchanger 4.
[0048] When both secondary cooling of lubricating oil 8 and secondary cooling of high-temperature water 6 are required, close the butterfly valve 16 on the cooling water bypass pipe of the lubricating oil secondary plate heat exchanger 4, open the butterfly valve 16 between the water supply pump 11 and the inlet end of the cooling water channel of the lubricating oil secondary plate heat exchanger 4, open the butterfly valve 16 between the outlet end of the cooling water channel of the lubricating oil secondary plate heat exchanger 4 and the cooling tower 5, close the butterfly valve 16 on the cooling water bypass pipe of the high-temperature water plate heat exchanger 2, open the butterfly valve 16 between the water supply pump 11 and the inlet end of the cooling water channel of the high-temperature water plate heat exchanger 2, open the butterfly valve 16 between the outlet end of the cooling water channel of the high-temperature water plate heat exchanger 2 and the cooling tower 5, so that the cooling water first enters the lubricating oil secondary plate heat exchanger 4 to perform secondary cooling of the lubricating oil 8, and the cooled water after heat exchange then enters the high-temperature water plate heat exchanger 2 to perform secondary cooling of the high-temperature water 6. Thus, by installing multiple butterfly valves 16, flexible control of the cooling water can be achieved. At this time, the flow paths of the high-temperature water 6 and the lubricating oil 8 are as follows: after the high-temperature water 6 comes out of the high-temperature water outlet of the diesel engine 14, it first passes through the air-cooled radiator 1, and then through the high-temperature water plate heat exchanger 2, achieving two cooling cycles; after the lubricating oil 8 comes out of the lubricating oil outlet of the diesel engine 14, it first passes through the lubricating oil primary plate heat exchanger 3, and then through the lubricating oil secondary plate heat exchanger 4. In the air-cooled radiator 1, the heat of the high-temperature water 6 (high-temperature water 6 refers to water with a temperature higher than 80℃) is carried away by the outside air; in the high-temperature water plate heat exchanger 2, the heat of the high-temperature water 6 is carried away by the cooling water after being cooled by the cooling tower 5; in the lubricating oil primary plate heat exchanger 3, the heat of the lubricating oil 8 is carried away by the low-temperature water 7 of the diesel engine 14 (low-temperature water 7 refers to water with a temperature between 40℃ and 55℃); in the lubricating oil secondary plate heat exchanger 4, the heat of the lubricating oil 8 is carried away by the cooling water after being cooled by the cooling tower 5. The cooling water first enters the lubricating oil secondary plate heat exchanger 4 and then enters the high-temperature water plate heat exchanger 2.
[0049] This invention adopts a combination of air cooling and water cooling. Compared with the traditional water cooling method of cooling towers, this invention reduces water consumption and lowers costs, effectively improving the problems of high water costs and excessive power plant operation and maintenance costs in arid areas. Compared with the traditional air cooling method, the combined air cooling and water cooling method of this invention has better cooling effect, reduces equipment costs, and solves the problem of significantly increased manufacturing costs of air-cooled islands when the ambient temperature exceeds 35°C.
[0050] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A combined water-cooling and air-cooling cooling system, characterized in that: It includes an air-cooled radiator, one end of which is connected to the high-temperature water outlet of the diesel engine via a pipeline, and the other end of which is connected to one end of a high-temperature water plate heat exchanger via a pipeline. The high-temperature water plate heat exchanger is a water-cooled plate heat exchanger, and the other end of which is connected to the high-temperature water return port of the diesel engine. It also includes a primary plate heat exchanger for lubricating oil and a secondary plate heat exchanger for lubricating oil. Both the primary and secondary plate heat exchangers for lubricating oil are water-cooled plate heat exchangers. One end of the primary plate heat exchanger for lubricating oil is connected to the diesel engine lubricating oil outlet via a pipeline, and the other end of the primary plate heat exchanger for lubricating oil is connected to one end of the secondary plate heat exchanger for lubricating oil via a pipeline. The other end of the secondary plate heat exchanger for lubricating oil is connected to the diesel engine lubricating oil return port.
2. The water-cooled and air-cooled combined cooling system according to claim 1, characterized in that: The high-temperature water plate heat exchanger is provided with a high-temperature water channel and a cooling water channel. The high-temperature water channel is used for passing high-temperature water that has been cooled by the air-cooled radiator. The cooling water channel is used for passing cooling water. The high-temperature water channel and the cooling water channel are arranged adjacent to each other.
3. The water-cooled and air-cooled combined cooling system according to claim 2, characterized in that: It also includes a cooling water supply system, which comprises a circulating water tank, a water supply pump, a cooling tower, and a spray pump. The circulating water tank stores cooling water. One end of the water supply pump is connected to the circulating water tank via a pipeline, and the water supply pump is used to pump the cooling water out of the circulating water tank. The other end of the water supply pump is connected to the inlet end of the cooling water channel of the high-temperature water plate heat exchanger via a pipeline. The outlet end of the cooling water channel of the high-temperature water plate heat exchanger is connected to the cooling coil in the cooling tower via a pipeline. The cooling coil is connected to the circulating water tank via a pipeline. The spray pump is used to pump water from the cooling tower base to the surface of the cooling coil to cool the cooling coil.
4. The water-cooled and air-cooled combined cooling system according to claim 2, characterized in that: Valves are installed at both the inlet and outlet ends of the high-temperature water channel, and valves are also installed at both the inlet and outlet ends of the cooling water channel of the high-temperature water plate heat exchanger. The high-temperature water plate heat exchanger is connected in parallel with a high-temperature water bypass pipe, and a valve is also installed on the high-temperature water bypass pipe.
5. The water-cooled and air-cooled combined cooling system according to claim 3, characterized in that: Both the primary and secondary plate heat exchangers for lubricating oil are provided with lubricating oil channels and cooling water channels. The lubricating oil channels are used for passing lubricating oil to be cooled, and the cooling water channels are used for passing cooling water. The lubricating oil channels and the cooling water channels are arranged adjacent to each other.
6. The water-cooled and air-cooled combined cooling system according to claim 5, characterized in that: The inlet end of the cooling water channel of the primary plate heat exchanger for lubricating oil is connected to the low-temperature water outlet of the diesel engine via a pipeline, and the outlet end of the cooling water channel of the primary plate heat exchanger for lubricating oil is connected to the low-temperature water air cooler via a pipeline. The low-temperature water air cooler is connected to the low-temperature water return port of the diesel engine via a pipeline.
7. The water-cooled and air-cooled combined cooling system according to claim 5, characterized in that: The other end of the water supply pump is connected to the inlet end of the cooling water channel of the two-stage plate heat exchanger for lubricating oil via a pipeline, and the outlet end of the cooling water channel of the two-stage plate heat exchanger for lubricating oil is connected to the cooling coil.
8. The water-cooled and air-cooled combined cooling system according to claim 7, characterized in that: The outlet end of the cooling water channel of the lubricating oil secondary plate heat exchanger is also connected to the inlet end of the cooling water channel of the high-temperature water plate heat exchanger.
9. The water-cooled and air-cooled combined cooling system according to claim 5, characterized in that: Valves are installed at both the inlet and outlet ends of the lubricating oil passage, and valves are also installed at both the inlet and outlet ends of the cooling water passages of the primary and secondary lubricating oil plate heat exchangers. The primary plate heat exchanger and the secondary plate heat exchanger for lubricating oil are each connected in parallel with a lubricating oil bypass pipe, and a valve is also installed on the lubricating oil bypass pipe.
10. The water-cooled and air-cooled combined cooling system according to claim 8, characterized in that: A valve is installed between the water supply pump and the inlet end of the cooling water channel of the two-stage plate heat exchanger for lubricating oil, and a valve is installed between the outlet end of the cooling water channel of the two-stage plate heat exchanger for lubricating oil and the cooling tower. A valve is installed between the water supply pump and the inlet end of the cooling water channel of the high-temperature water plate heat exchanger, and a valve is installed between the outlet end of the cooling water channel of the high-temperature water plate heat exchanger and the cooling tower. A valve is installed on the cooling water bypass pipe of the lubricating oil secondary plate heat exchanger, and a valve is installed on the cooling water bypass pipe of the high temperature water plate heat exchanger. The cooling water bypass pipe of the lubricating oil secondary plate heat exchanger is connected to the inlet end of the cooling water channel of the high-temperature water plate heat exchanger.