Pod engine cooling system

Abstract

The invention discloses a pod engine cooling system. The pod engine cooling system comprises an electronic water pump, a thermostat, a heat dissipation device and an engine cylinder body branch which are connected through a pipeline. A temperature detection module for detecting the temperature of cooling liquid in the engine cylinder body branch is arranged on the engine cylinder body branch, and the electronic water pump adjusts the flow of the cooling liquid according to the detected temperature of the cooling liquid. The flow of the cooling liquid can be adjusted according to the current temperature of the engine, so that the engine can work at the proper temperature all the time, the power of the engine can be improved, frequent switching between large circulation and small circulation can be avoided, large temperature fluctuation of the cooling liquid is avoided, the cooling effect on the engine is guaranteed, and the service life of the engine is prolonged. The heat dissipation requirement of the heavy-load pod engine can be met, the power of the engine is improved, the problem that engine parts are damaged due to high temperature can be avoided, and the service life of the engine can be prolonged.

Description

Technical Field

[0001] The invention relates to an engine cooling system, in particular to a pod engine cooling system. Background Art

[0002] A pod is a streamlined nacelle section that is equipped with certain airborne equipment or weapons and is suspended under the fuselage or wing. Among them, the power supply pod is a device installed on the drone, mainly used to improve the energy efficiency and endurance of the drone. During the operation of the drone, a large amount of heat will be generated in the pod, and the temperature inside the pod will rise. Once the temperature inside the pod is overheated, the high temperature will cause the normal use of the engine and reduce the endurance of the drone.

[0003] Chinese patent document CN114633890A discloses a power supply pod, including an air duct, an electrical system compartment, a fuel compartment and an engine compartment, wherein the air duct, the electrical system compartment, the fuel compartment and the engine compartment are connected in sequence, the air duct is provided with an air inlet, a fuel tank is provided in the fuel compartment, and a cooling channel is formed between the outer wall of the fuel tank and the inner wall of the fuel compartment, so that the airflow entering the air duct from the air inlet enters the engine compartment through the electrical system compartment and the cooling channel to dissipate heat for the engine in the engine compartment. The above-mentioned power supply pod, under the cooling effect of the external cooling airflow flowing into the air inlet, can improve the heat dissipation performance of the power supply pod, increase the cooling effect of the working parts in the power supply pod, so that the temperature inside the power supply pod is kept stable, and the temperature of the overall power supply pod will no longer be overheated due to rapid temperature rise, thereby reducing the instability of the drone signal caused by excessive temperature and improving the stability and reliability of the system operation.

[0004] In this prior art, air cooling is used to dissipate heat inside the pod. However, this air cooling method cannot meet the heat dissipation requirements of a high-load pod engine. Therefore, Chinese patent document CN105927350A discloses an engine cooling system using an electronically controlled auxiliary water pump, including a high-temperature circulation cooling system and a low-temperature circulation cooling system; the high-temperature circulation cooling system has three coolant flow paths: a large circulation, a small circulation, and a delayed circulation. By adding an electronically controlled auxiliary water pump to the high-temperature circulation cooling system and realizing a delayed circulation, it can better meet the heating requirements of various components after the engine is shut down, and solve the flow direction problem of the cooling circulation between different components.

[0005] In addition, Chinese patent document CN106523173A discloses an engine cooling system, which utilizes coolant to circulate in the system to cool the engine, and includes a main circulation loop, a first branch circulation loop and a second branch circulation loop; the first branch circulation loop includes a cylinder water jacket provided on the engine body; the second branch circulation loop includes a cylinder head water jacket provided on the engine body. The present invention can cool the cylinder body and the cylinder head separately, and set a thermostat in each cooling system to control the circulation of each water cooling system separately, so that the water temperature range is increased, and the overall heat dissipation effect is further improved; the cooling system is provided with the controller, which is connected to the temperature sensor, and the flow of the circulation loop is adjusted in real time according to the coolant temperature to prevent the engine body from overheating or overcooling, and improve the overall performance of the engine.

[0006] In the above-mentioned prior art, the cooling liquid is circulated in the engine body instead of the air cooling method, which greatly improves the cooling effect of the engine. However, in the actual working process, there are still problems such as engine power reduction. Summary of the invention

[0007] In order to solve the technical problem of engine power reduction in the prior art, the present invention provides a pod engine cooling system, comprising an electronic water pump, a thermostat, a heat dissipation device and an engine cylinder branch connected by pipelines; wherein: a temperature detection module for detecting the coolant temperature in the engine cylinder branch is provided on the engine cylinder branch, and the electronic water pump adjusts the flow rate of the coolant according to the detected coolant temperature.

[0008] During the cooling process of the engine, although the cylinder block and the cylinder head can be cooled, the engine temperature cannot be guaranteed to be within the appropriate temperature range during the cooling process, which will lead to problems such as reduced power and unstable idle speed of the engine, and ultimately lead to the problem of reduced engine power. In the prior art, although the circulation flow of the coolant in the main circulation loop can be achieved through the cooperation of the coolant temperature sensor and the electronic water pump, during the small circulation cooling process, since the coolant will not flow into the main circulation loop, the temperature of the engine cannot be properly adjusted during the small circulation process, and it is easy to be high, so that it enters the large circulation. After the large circulation cooling, the engine temperature drops and enters the small circulation cooling again. In this way, the cooling system will frequently switch between the large and small circulations, which will cause large fluctuations in the coolant temperature, affect the cooling effect of the engine, and reduce the engine power. In addition, large fluctuations in the engine operating temperature will cause damage to the engine components, which will also reduce the engine power and reduce the service life of the engine.

[0009] Therefore, in the present solution, a temperature detection module is provided on the engine cylinder branch, and the temperature detection module is used to detect the temperature of the coolant during the entire cooling process, and then the flow rate of the coolant during the entire cooling process is adjusted through the cooperation of the electronic water pump and the temperature detection module. Therefore, whether in the large cycle or the small cycle, the flow rate of the coolant can be adjusted according to the current engine temperature, so that the engine can always operate at a suitable temperature. On the one hand, the power of the engine can be improved, and on the other hand, too frequent switching of the large cycle and the small cycle can be avoided, and large fluctuations in the coolant temperature can also be avoided, thereby ensuring the cooling effect of the engine, improving the power of the engine, avoiding the problem of damage to engine components due to high temperature, and improving the service life of the engine.

[0010] Preferably, the engine cylinder branch includes a cylinder block and a cylinder head, and the temperature detection module is disposed at the cylinder head. Since the coolant flows from the cylinder block toward the cylinder head, detecting the coolant temperature at the cylinder head can more accurately represent the temperature of the entire engine, thereby enabling the electronic water pump to more accurately regulate the engine coolant flow.

[0011] Preferably, the engine cylinder branch passes through the exhaust duct and cylinder liner integrated on the cylinder block in sequence when passing through the cylinder block. In this solution, the exhaust duct is also cooled, which can further effectively reduce the heat loss of the engine, and can also reduce the surface temperature of the exhaust pipe, increase the life of the exhaust pipe and surrounding components, thereby further increasing the service life of the engine.

[0012] Preferably, it also includes an air pump body branch arranged in parallel with the engine cylinder body branch, and part of the coolant flowing out of the electronic water pump enters the air pump body branch and then flows into the thermostat. In this solution, cooling the air pump body can effectively reduce the temperature of the compressed air, improve the air intake efficiency, and promptly remove the heat generated by the compressed air, thereby increasing the life of the air pump body and further increasing the service life of the engine.

[0013] Preferably, a pressure valve is also provided in the pipeline, and the engine cylinder and the air pump body branch cylinder converge to the pressure valve. Since the coolant will cause the pressure in the pipeline to change during the temperature change, and when the pressure in the pipeline is abnormal, it will affect the normal use of the cooling system. Therefore, in this solution, a pressure valve is provided in the pipeline of the cooling system, and the pressure in the pipeline is adjusted by the pressure valve, so as to ensure that the pressure of the cooling system can be kept within the normal range during use, and further ensure the normal use of the cooling system.

[0014] Preferably, the pressure valve is connected to an overflow bottle. In this solution, after the overflow bottle is provided, when the pressure difference between the inside and outside of the cooling system is greater than the opening pressure of the pressure valve, the coolant and gas in the cooling system can enter the overflow bottle, and the pressure in the cooling system will decrease. When the internal pressure of the cooling system is less than the external pressure, the coolant in the overflow bottle will flow to the cooling system, thereby replenishing the coolant in the cooling system, which can ensure the cooling effect of the cooling system.

[0015] Preferably, the pressure valve is located at the highest point of the pipeline. In this solution, when the pressure valve is set at the highest point, it can ensure that the pressure relief operation and the liquid replenishment operation are carried out in time, thereby ensuring the normal operation of the cooling system.

[0016] The present invention has the following beneficial effects: 1. In the present invention, a temperature detection module is arranged on the engine cylinder branch, and the temperature detection module is used to detect the temperature of the coolant in the whole cooling process, and then the flow of the coolant in the whole cooling process is adjusted by the cooperation of the electronic water pump and the temperature detection module. The flow of the coolant can be adjusted according to the current temperature of the engine, so that the engine can always work at a suitable temperature. On the one hand, the power of the engine can be improved, and on the other hand, it can also avoid the large cycle and the small cycle from switching too frequently, and also avoid the large fluctuation of the coolant temperature, so as to ensure the cooling effect of the engine, meet the heat dissipation requirements of the large-load pod engine, improve the power of the engine, and also avoid the problem of damage to engine components due to high temperature, and also improve the service life of the engine.

[0017] 2. The present invention also cools the exhaust duct, which can further effectively reduce the heat loss of the engine, and can also reduce the surface temperature of the exhaust pipe, thereby increasing the life of the exhaust pipe and surrounding components, thereby further increasing the service life of the engine.

[0018] 3. After cooling the air pump body, the present invention can effectively reduce the temperature of the compressed air, improve the air intake efficiency, and promptly take away the heat generated by the compressed air, thereby increasing the life of the air pump body and the air pump cover, and further increasing the service life of the engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The figure is a schematic diagram of the flow of coolant in an embodiment of a pod engine cooling system of the present invention.

[0020] The flow direction of the arrow in the figure is the flow direction of the coolant in the pipeline. DETAILED DESCRIPTION

[0021] The following is further described in detail through specific implementation methods: 1. Definition Overflow bottle: It is also a liquid storage bottle, which plays the role of overflow. When the system pressure is too high, the overflow will relieve the pressure.

[0022] 2. The embodiment is basically as shown in the attached Figure 1 As shown: A pod engine cooling system includes a pressure valve, a thermostat, a heat dissipation device, an electronic water pump, an engine cylinder branch and an air pump branch connected by pipelines, and the pipelines coming out of the electronic water pump are connected to the engine cylinder branch and the air pump branch respectively. The engine cylinder branch includes a first cylinder branch and a second cylinder branch, and the first cylinder branch and the second cylinder branch respectively include an integrated exhaust duct, a cylinder liner, a cylinder body and a cylinder head, the cylinder body is assembled on the casing, and the cylinder head is connected to the pressure valve through a pipeline. The air pump branch includes an air pump body and an air pump cover, and the air pump cover is connected to the pressure valve through a pipeline. The heat dissipation device adopts a water cooler.

[0023] The pressure valve is also connected to an overflow bottle. When the pressure difference between the inside and outside of the cooling system is greater than the opening pressure of the pressure valve, the coolant and gas pass through the opened pressure valve into the overflow bottle for pressure relief. When the pressure difference between the inside and outside of the system is less than the external pressure, the coolant in the overflow bottle will flow into the pipeline through the pressure valve to replenish the coolant in the cooling system.

[0024] The coolant flowing out of the pressure valve enters the thermostat, which automatically controls the opening or closing of the main valve and the auxiliary valve according to the temperature of the coolant to achieve different cooling cycles. The thermostat is directly connected to the electronic water pump through a pipeline. The thermostat is also connected to the water cooler through a pipeline and then connected to the electronic water pump. The different cooling cycles are as follows: ① During the heating process of the coolant, when the temperature of the coolant is lower than the initial opening temperature of the thermostat, a small cycle is performed: the pipeline between the thermostat and the electronic water pump is opened, the pipeline between the thermostat and the water cooler is closed, and the coolant in the thermostat directly flows back to the electronic water pump.

[0025] ② When the temperature of the coolant is greater than or equal to the initial opening temperature of the thermostat, when the lift of the main valve is less than or equal to the distance between the auxiliary valve and the thermostat seat, the auxiliary valve is still in the open state, and the coolant participates in the large circulation and the small circulation at the same time. The pipeline between the thermostat and the water cooler and the pipeline between the thermostat and the electronic water pump are all in the open state. Therefore, part of the coolant flowing out of the thermostat flows directly into the electronic water pump, and part of it first enters the water cooler, and then enters the electronic water pump for convergence after being cooled by the water cooler.

[0026] ③ During the process of coolant flowing in the pipeline, the temperature of the coolant rises. When the lift of the main valve is greater than the distance between the auxiliary valve and the thermostat seat, the auxiliary valve is closed, the main valve is fully opened, and the coolant mainly circulates in a large cycle. The pipeline between the thermostat and the water cooler is opened, and the pipeline between the thermostat and the electronic water pump is closed. The coolant first enters the water cooler for cooling, and then flows into the electronic water pump. However, when the auxiliary valve is closed, a small amount of coolant will still leak from the auxiliary valve into the electronic water pump, that is, a small amount of coolant leakage will participate in the small cycle.

[0027] ④ During the cooling process of the coolant, when the temperature of the coolant is lower than the closing valve temperature of the thermostat, the coolant only undergoes a small circulation, that is, the coolant flows directly into the electronic water pump, and the pipeline between the thermostat and the water cooler is closed.

[0028] The electronic water pump adopts an external electronic water pump. The electronic water pump forces the coolant to flow into the engine cylinder branch and the air pump branch: ① Air pump branch: part of the coolant coming out of the electronic water pump passes through the air pump body and air pump cover and then enters the pressure valve.

[0029] ② Engine cylinder branch: After the coolant comes out of the electronic water pump, it enters the first cylinder branch and the second cylinder branch respectively, that is, the coolant in the two ways flows into the cylinder and the cylinder head respectively, and then enters the pressure valve. When flowing into the cylinder, it passes through the integrated exhaust duct and cylinder sleeve in turn and then enters the cylinder head. There is also an integrated water temperature sensor on the cylinder head to detect the temperature of the coolant. When the temperature of the coolant is high, the speed of the electronic water pump increases, and when the temperature of the coolant is low, the speed of the electronic water pump decreases.

[0030] The specific implementation process is as follows: when in use, the engine starts and the engine temperature begins to rise. Since the temperature is low when the engine starts, the coolant temperature is low and is in the process of heating up. When the coolant temperature is lower than the initial opening temperature of the thermostat, a small cycle is performed: the main valve of the thermostat is closed and the auxiliary valve is opened. At this time, the pipeline between the thermostat and the electronic water pump is opened, and the pipeline between the thermostat and the water cooler is closed. The coolant in the thermostat flows directly back to the electronic water pump.

[0031] During the operation of the engine, the coolant temperature gradually increases. When the coolant temperature rises to a level that exceeds the initial opening temperature of the thermostat, the main valve begins to change from a closed state to an open state. In this process, when the lift of the main valve is less than or equal to the distance between the auxiliary valve and the thermostat seat, the auxiliary valve is still in an open state, and the coolant participates in both the large and small cycles. The pipes between the thermostat and the water cooler, as well as the pipes between the thermostat and the electronic water pump are all in an open state. Therefore, part of the coolant flowing out of the thermostat flows directly into the electronic water pump, and part of it first enters the water cooler, and then enters the electronic water pump for convergence after being cooled by the water cooler.

[0032] When the temperature of the coolant drops to less than the closing valve temperature of the thermostat, the coolant only circulates a small amount, that is, the coolant flows directly into the electronic water pump, and the pipeline between the thermostat and the water cooler is closed.

[0033] The above is only an embodiment of the present invention. The common sense such as the known specific structure and characteristics in the scheme is not described in detail here. The ordinary technicians in the relevant field know all the common technical knowledge in the technical field of the invention before the application date or priority date, can know all the existing technologies in the field, and have the ability to apply the conventional experimental means before that date. The ordinary technicians in the relevant field can improve and implement this scheme in combination with their own abilities under the enlightenment given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent. The protection scope required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A pod engine cooling system, comprising an electronic water pump, a thermostat, a heat sink and an engine cylinder branch connected by pipelines; characterized in that: The engine cylinder branch is provided with a temperature detection module for detecting the temperature of the coolant in the engine cylinder branch, and the electronic water pump adjusts the flow rate of the coolant according to the detected coolant temperature.

2. The nacelle engine cooling system according to claim 1, characterized in that: The engine cylinder branch includes a cylinder block and a cylinder head, and the temperature detection module is arranged at the cylinder head.

3. The nacelle engine cooling system according to claim 2, characterized in that: The engine cylinder branch passes through the exhaust passage and the cylinder liner integrated on the cylinder block in sequence when passing through the cylinder block.

4. The nacelle engine cooling system according to any one of claims 1 to 3, characterized in that: It also includes an air pump body branch arranged in parallel with the engine cylinder body branch, and part of the coolant flowing out of the electronic water pump enters the air pump body branch and then flows into the thermostat.

5. The nacelle engine cooling system according to claim 4, characterized in that: A pressure valve is also provided in the pipeline, and the engine cylinder branch and the air pump body branch are merged into the pressure valve.

6. The nacelle engine cooling system according to claim 5, characterized in that: The pressure valve is connected with an overflow bottle.

7. The nacelle engine cooling system according to claim 6, characterized in that: The pressure valve is located at the highest point of the pipeline.

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