New engine fuel cooling and heat dissipation system

Abstract

A new type of fuel cooling and heat dissipation system for an engine includes an engine, a fuel tank and a fuel cooling system. The fuel tank is loaded with fuel, a cooling channel is arranged on the engine, and the fuel cooling system includes a fuel pump. The inlet of the fuel pump is connected to the fuel tank, the outlet of the fuel pump is connected to the inlet of the cooling channel, and the outlet of the cooling channel is connected to the fuel tank, and is used to realize the reflux of high-temperature fuel after heat exchange to the fuel tank. Through the above structural design, the present invention uses a fuel cooling and heat dissipation method to directly cool the main heat-receiving parts such as the cylinder and the cylinder head. Compared with air cooling, the heat dissipation effect is better, the cylinder temperature is lower, the engine performance is better, the service life is longer, and the performance in all aspects can reach the same level as that of a water-cooled engine. Compared with a water-cooled engine, the system structure of the present invention is simpler, and it can effectively reduce engine failures and reduce the weight of the whole vehicle.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of power equipment, and in particular to a novel fuel cooling and heat dissipation system for an engine. Background Art

[0002] Taking the engine used in automobiles as an example, the heat dissipation methods of existing piston gasoline engines or diesel engines mainly include air cooling, water cooling and oil cooling.

[0003] For air cooling, the natural wind during the engine's movement is used to directly cool the engine. A large number of heat sinks are required outside the main heat-bearing parts of the engine to absorb the heat of the engine. The heat sinks are in contact with the air to achieve heat dissipation. Due to the poor thermal conductivity of air, the heat dissipation efficiency of air cooling is low, which leads to problems such as easy overheating and short life of the engine. Moreover, due to the limitations of the engine form, for example, inline four-cylinder engines rarely use air cooling. Since the middle two cylinders cannot effectively dissipate heat, air cooling is only suitable for small-displacement, low-performance engines with two cylinders or single cylinders.

[0004] For water cooling, it is necessary to lay out coolant channels around the cylinder and cylinder head, circulate coolant in the coolant channels, and use the coolant to absorb the heat of the cylinder and cylinder head. The water cooling system needs to be equipped with components such as a water pump, a water tank, and a cooling fan. The water pump is directly connected to the engine gear or belt drive. The engine drives the water pump to operate, and the coolant absorbs heat, and then the cooling fan dissipates the coolant. Because the water cooling system has more parts such as a water tank, a water pump, a fan, a water pipe, and a thermostat than the air cooling system, compared with the air cooling method, the water cooling system is more expensive, heavier, more complex in structure, and has a higher failure rate.

[0005] For the oil cooling method, a radiator similar to the cooling water tank of a water-cooled car is installed to reduce the temperature of the engine oil through external circulation, and generally no cooling fan is required. When combined with the air cooling method, its structure is relatively simple compared to the water cooling method. Since the oil that lubricates the engine parts is directly cooled, the engine failure rate can be reduced. The low oil temperature can also reduce the high-temperature viscosity of the oil, and the heat dissipation effect is also better. However, the oil cooling method also has certain defects. For example, there are restrictions on the amount of engine oil, and the oil radiator cannot be too large. If the oil radiator is too large, the oil will flow into the oil radiator, resulting in insufficient lubrication at the bottom of the engine. Summary of the invention

[0006] In summary, how to provide an engine with a simple structure and reliable heat dissipation performance has become an urgent problem to be solved by those skilled in the art.

[0007] In order to achieve the above purpose, the embodiment of the present invention provides the following technical solutions:

[0008] The present invention provides a novel fuel cooling and heat dissipation system for an engine, comprising an engine and a fuel tank, wherein the engine is provided with a fuel injector, and the fuel tank is connected to the fuel injector through a fuel delivery pipe for delivering fuel to the engine.

[0009] The present invention provides a cooling channel on the engine; in addition, the present invention also provides a fuel cooling system.

[0010] Specifically, the fuel cooling system includes a fuel pump capable of providing circulation power for the fuel, the inlet of the fuel pump is connected to the fuel tank and is used to transport the low-temperature fuel in the fuel tank to the fuel pump, the outlet of the fuel pump is connected to the inlet of the cooling channel and is used to transport the low-temperature fuel output by the fuel pump to the cooling channel, and the outlet of the cooling channel is connected to the fuel tank and is used to realize the reflux of high-temperature fuel after heat exchange into the fuel tank.

[0011] Preferably, the present invention also includes a control system; the control system includes a first temperature sensor for monitoring the engine temperature, and a controller module with signal processing and control functions, the controller module is connected to the first temperature sensor signal and is used to receive the monitoring signal generated by the first temperature sensor, and the controller module is connected to the fuel pump control and is used to control the operating state of the fuel pump.

[0012] Preferably, the control system further comprises a second temperature sensor for monitoring the fuel temperature in the fuel tank, and the second temperature sensor is signal-connected to the controller module.

[0013] Preferably, the fuel pump is connected to the fuel tank via a cooling inlet pipe, a cooling outlet pipe is provided between the cooling channel and the fuel tank; the cooling inlet pipe is in communication with the bottom wall of the tank.

[0014] Preferably, a fuel supply port is also provided on the bottom wall of the fuel tank, and the fuel delivery pipe is connected to the fuel supply port; a fuel supply area is formed inside the fuel tank and around the fuel supply port so that fuel preferentially enters the fuel delivery pipe, one end of the cooling outlet pipe is connected to the outlet of the cooling channel, and the other end of the cooling outlet pipe is inserted into the fuel tank and arranged in the fuel supply area.

[0015] Preferably, the oil supply port is a funnel-shaped structure.

[0016] Preferably, one end of the cooling outlet pipe inserted into the fuel tank is inserted from the bottom wall of the fuel tank and adopts an elbow structure.

[0017] Preferably, the cooling inlet pipe is communicated with the bottom wall of the fuel tank, and the second temperature sensor is arranged on the bottom wall of the fuel tank and close to the cooling inlet pipe.

[0018] Preferably, a defoaming device for defoaming the fuel is provided in the cooling outlet pipe.

[0019] The present invention provides a novel fuel cooling and heat dissipation system for an engine, the heat dissipation system specifically includes an engine and a fuel tank, the fuel tank is loaded with fuel, and a cooling channel is arranged on the engine. The present invention also provides a fuel cooling system, specifically, the fuel cooling system includes a fuel pump capable of providing circulation power for the fuel, the inlet of the fuel pump is connected to the fuel tank, and is used to deliver the fuel with a lower temperature in the fuel tank to the fuel pump, the outlet of the fuel pump is connected to the inlet of the cooling channel, and is used to deliver the low-temperature fuel output by the fuel pump to the cooling channel, and the outlet of the cooling channel is connected to the fuel tank, and is used to realize the reflux of the high-temperature fuel after heat exchange to the fuel tank. Through the above structural design, the present invention uses a fuel cooling and heat dissipation method to directly cool the main heat-receiving parts such as the cylinder and the cylinder head, so compared with air cooling, the heat dissipation effect is better, the cylinder temperature is lower, the engine performance is better, the service life is longer, and the performance in all aspects can reach the same level as that of a water-cooled engine. Compared with a water-cooled engine, the system structure of the present invention is simpler, and can effectively reduce engine failures and reduce the weight of the whole vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0021] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantial technical significance. Any structural modification, change in proportion or adjustment of size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0022] Figure 1 A schematic diagram of the structure of a novel fuel cooling and heat dissipation system for an engine according to an embodiment of the present invention;

[0023] exist Figure 1 In the figure, the corresponding relationship between the component names and the reference numerals is as follows:

[0024] Engine 1, fuel tank 2, fuel injector 3, fuel pump 4, first temperature sensor 5, controller module 6, second temperature sensor 7;

[0025] Oil supply area a. DETAILED DESCRIPTION

[0026] The following is a description of the implementation of the present invention by specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] Please refer to Figure 1 , Figure 1 The present invention is a simplified schematic diagram of the structure of a novel fuel cooling and heat dissipation system for an engine in an embodiment of the present invention.

[0028] The present invention belongs to the field of mechanical engineering and is directly applicable to various engines that require liquid cooling and heat dissipation systems and use liquid as fuel, such as automobile engines, motorcycle engines, two-stroke engines and four-stroke engines. Among them, it is mainly applied to fields with strong requirements for engine lightweight and performance, such as modified cars, performance cars, small aircraft and aircraft.

[0029] For those skilled in the art, water cooling can effectively control the temperature of high-power and high-speed engines. When the temperature of an engine using water cooling is low, the throttle valve will be closed until the temperature rises to reach the optimal operating temperature. When the temperature is high, the throttle valve will be fully opened and the water tank will start working. When the temperature is too high, the fan will turn on to cool down the engine to the optimal operating temperature.

[0030] Based on the water cooling operation mode of the above-mentioned engine, the present invention provides a novel fuel cooling and heat dissipation system for an engine. The novel fuel cooling and heat dissipation system for an engine includes an engine 1 and a fuel tank 2 .

[0031] The engine 1 has an engine cylinder block and an engine head, and the cylinder block and the engine head are the main heat-receiving parts. Therefore, in a water-cooled engine system, cooling channels are provided in the cylinder block and the engine head so that when the coolant flows through the cooling channels, the heat can be taken away in time to achieve cooling. The engine 1 used in the present invention follows the structural design of a traditional water-cooled engine, and cooling channels are provided in the cylinder block and the engine head to achieve the circulation of a cooling medium (the cooling medium in the present invention is fuel).

[0032] The engine is provided with a fuel injector 3 or a fuel injection assembly, and the fuel can be sprayed into the cylinder of the engine 1 only after passing through the fuel injector 3 or the fuel injection assembly. The fuel tank 2 is a device for loading fuel in the present invention, which is connected to the fuel injector 3 through a fuel delivery pipe and is used to deliver fuel to the engine.

[0033] As can be seen from the above, the present invention sets a cooling channel on the engine 1. Based on the structural design, the present invention also provides a fuel cooling system, through which the fuel cooling system can use fuel as a cooling medium to achieve cooling of the engine 1.

[0034] Specifically, the fuel cooling system includes a fuel pump 4 capable of providing circulation power for the fuel. The fuel pump 4 is a pump-type power device capable of providing circulation power for the fuel. In the present invention, the fuel pump 4 adopts a continuously variable electronic pump, so that the delivery amount of the cooling fuel (the fuel with a lower temperature in the fuel tank 2) can be infinitely adjusted. The fuel pump 4 used in the present invention is an electronic pump, specifically a continuously variable pump. According to the temperature of the engine 1 (mainly the cylinder of the engine 1) (obtained by the first temperature sensor 5) and the temperature of the fuel in the tank (obtained by the second temperature sensor 7), the controller module adjusts the electronic pump, thereby realizing automatic adjustment of the speed of the electronic pump, adjusting the flow rate of the normal temperature fuel in the tank according to the speed of the electronic pump, and then adjusting the ratio of the normal temperature fuel to the high temperature fuel in the cooling channel, thereby adjusting the overall temperature of the fuel in the cooling channel, and adjusting the cylinder and cylinder head temperature of the engine 1 in turn.

[0035] After the fuel pump 4 is set up, the inlet of the fuel pump 4 is connected to the fuel tank 2 through pipelines to transport the fuel with a lower temperature in the fuel tank 2 to the fuel pump 4, the outlet of the fuel pump 4 is connected to the inlet of the cooling channel to transport the fuel with a lower temperature transported by the fuel pump 4 to the cooling channel, and the outlet of the cooling channel is connected to the fuel tank 2 to realize the reflux of the high-temperature fuel after heat exchange into the fuel tank 2.

[0036] In the above structural design, after the engine 1 is started, the fuel pump 4 provides power to pump the fuel in the fuel tank 2 to the cooling channel of the engine, and the low-temperature fuel absorbs the heat of the engine 1 to cool the engine 1, and then becomes high-temperature fuel and flows back to the tank.

[0037] In order to intelligently control the fuel pump 4, the present invention also provides a control system, which has the functions of control parameter acquisition, parameter analysis, and control instruction generation and transmission. Specifically, the control system includes a first temperature sensor 5 for monitoring the temperature of the engine 1, a controller module 6 with signal processing and control functions, the controller module 6 is connected to the first temperature sensor 5 by signal, and is used to receive the monitoring signal generated by the first temperature sensor 5, and the controller module 6 is connected to the fuel pump 4 by control, and is used to control the operating state of the fuel pump 4. The controller module 6 is an industrial control-level controller, which is connected to a temperature sensor capable of temperature signal acquisition through a signal line. After the temperature sensor obtains the temperature signal, the temperature signal is sent to the controller module 6, and the controller module 6 controls the start and stop of the fuel pump 4 and the operating speed of the fuel pump 4 according to the temperature signal.

[0038] In order to improve the control accuracy of the fuel pump 4, in the present invention, the control system further includes a second temperature sensor 7 for monitoring the temperature of the fuel in the fuel tank 2, and the second temperature sensor 7 is signal-connected to the controller module 6. In this way, the fuel pump 4 is controlled by combining the two temperature parameters of the temperature of the fuel in the fuel tank and the temperature of the main heat-receiving parts of the engine 1 (cylinder block and engine head), so that the purpose of improving the control accuracy of the fuel pump 4 can be achieved.

[0039] Specifically, the fuel pump 4 is connected to the fuel tank 2 through a cooling inlet pipe, and a cooling outlet pipe is provided between the cooling channel and the fuel tank 2. Specifically, the cooling inlet pipe is connected to the bottom wall of the fuel tank. The cooling inlet pipe is connected to the bottom wall of the fuel tank, and the fuel at the bottom of the fuel tank can be directly extracted as a cooling medium. This design structure is relatively simple and can avoid the problem of empty extraction of the cooling inlet pipe.

[0040] It is defined here that: a fuel supply port is also opened on the bottom wall of the fuel tank 2, and the fuel delivery pipe is connected to the fuel supply port; a fuel supply area a is formed inside the fuel tank 2 and around the fuel supply port, where the fuel preferentially enters the fuel delivery pipe; one end of the cooling outlet pipe is connected to the outlet of the cooling channel, and the other end of the cooling outlet pipe is inserted into the fuel tank 2 and arranged in the fuel supply area a.

[0041] Specifically, the fuel supply port is a funnel-shaped structure. One end of the cooling outlet pipe inserted into the fuel tank 2 is inserted from the bottom wall of the fuel tank 2 and is designed with an elbow structure.

[0042] Based on the above structural design, the fuel flowing through the engine 1 absorbs the heat of the engine 1 and its temperature rises, and then flows back to the fuel tank 2 through the cooling outlet pipe. One end of the cooling outlet pipe is set in the fuel tank 2 and is an elbow structure, and is also located in the fuel supply area a, so that the high-temperature fuel flowing back can be output from the fuel supply port first to participate in the combustion operation of the engine 1. Due to the high temperature of the fuel, it can reduce the occurrence of carbon deposition problems in the engine 1. In addition, the high-temperature fuel flowing back is preferentially involved in combustion, and its influence on the fuel temperature in the fuel tank 2 is minimized, so that most of the fuel in the fuel tank 2 is kept at a low temperature.

[0043] Specifically, the cooling inlet pipe is communicated with the bottom wall of the fuel tank 2, and the second temperature sensor 7 is arranged on the bottom wall of the fuel tank 2 and close to the cooling inlet pipe.

[0044] The present invention also provides a defoaming device for defoaming the fuel in the cooling outlet pipe to achieve defoaming of the reflux fuel.

[0045] The improved concept of the present invention draws on the existing water-cooled heat dissipation method engine 1, and on the basis of its structural design, abandons the water pump, heat dissipation water tank, water tank throttle, fan, coolant storage tank and other structures that come with the engine 1, and abandons the coolant as the cooling medium. Instead, the normal temperature gasoline or diesel in the fuel tank is directly used as the cooling medium. Through a reasonable structural layout design, the normal temperature gasoline or diesel can be circulated between the fuel tank 2 and the engine 1 by itself, and the engine is cooled during this circulation process.

[0046] In the present invention, the fuel in the fuel tank serves as both fuel and coolant. The fuel is replaced by a small fuel pump that replaces the gear or belt driven water pump of the traditional engine 1 that cannot be freely and independently adjusted in speed. The fuel pump transports the normal temperature fuel in the fuel tank 2 to the cooling channel on the engine 1 through a cooling inlet pipe extending into the fuel tank for cooling the main heat-receiving parts of the engine 1.

[0047] The specific operation procedure of the present invention is as follows: when the engine 1 is in a low-temperature starting state, the temperature of the cylinder of the engine 1 is relatively low, which will lead to poor fuel vaporization and reduced combustion efficiency. At this time, the electronic pump stops the circulation of the fuel, thereby stopping the heat exchange work to cooperate with the rapid heating of the engine 1; when the engine 1 runs for a period of time, the cylinder temperature sensor (the first temperature sensor 5) detects that the cylinder temperature reaches about 90°C, and the electronic pump starts to work at a low speed; when the engine 1 is in a medium or high speed operation, the temperature of the cylinder of the engine 1 also rises at a medium or high speed. At this time, the electronic pump also rotates at a medium or high speed to ensure the cooling effect of the engine. In this process, the normal temperature fuel and the high temperature fuel in the cooling channel are mixed into a cooling fuel with a moderate temperature. The fuel circulates back and forth, and finally the mixed fuel is pumped back to the fuel tank 2 by the electronic pump through the cooling outlet pipe, and mixed with the normal temperature fuel in the fuel tank 2, and then sucked into the injector 3 of the engine 1 or the injection assembly of the engine 1, and finally burned in the engine 1, thus completing a cycle.

[0048] By designing the structure of the cooling outlet pipe, the high-temperature fuel in the cooling outlet pipe can be quickly output from the fuel tank 2 to the fuel delivery pipe, so that the temperature of the fuel in other parts of the fuel tank 2 can be basically maintained at room temperature, meeting the cooling requirements.

[0049] In the present invention, as long as there is fuel in the fuel tank that exceeds the minimum fuel guarantee line, and refuel is added when the fuel in the fuel tank is consumed to the minimum fuel guarantee line, the cooling cycle can continue. Even in the special situation where the fuel is consumed below the minimum fuel guarantee line and it is still impossible to reach the nearest gas station, the engine 1 can be operated at a low speed to reduce the heat generation, so as to continue driving to the nearest gas station.

[0050] The present invention uses a fuel cooling and heat dissipation method to directly cool the cylinder and the cylinder head and other main heat-receiving parts. Compared with air cooling, the heat dissipation effect is better, the cylinder temperature is lower, the engine 1 has better performance and longer life, and the performance in all aspects can reach the same level as the water-cooled engine. The parts are only a small fuel pump, a cylinder temperature detector and a fuel tank temperature detector more than the air-cooled heat dissipation method engine 1. Under the same displacement conditions, the overall structure weight and cost of the air-cooled heat dissipation method engine can be almost the same. Since the fuel cooling and heat dissipation method and the water cooling and heat dissipation method have basically the same structural design and principle, there is no need to redesign and develop, and there is no need for a huge water tank, the engine weight is greatly reduced, and the fuel consumption is greatly reduced, thereby greatly reducing the cost of modification, design and development, and parts procurement and use. Because the normal temperature fuel below 50°C is used as the cooling medium and the heat exchange is carried out through the electronically controlled continuously variable electronic pump, the temperature control is faster, more accurate and more stable than the existing water cooling and heat dissipation method. Since the number of parts in the heat dissipation system is greatly reduced, the failure rate of the heat dissipation system is greatly reduced, and at the same time, other engine failures caused by heat dissipation system failures are also reduced to varying degrees. Furthermore, since gasoline and diesel have extremely low freezing points and extremely high boiling points compared to traditional coolants, the engine 1 using fuel cooling and heat dissipation can be used in various severe climatic conditions such as high altitudes, high temperatures, and severe cold. The practicality, versatility, and adaptability to the environment are greatly improved compared to the engine 1 using a water cooling and heat dissipation system.

[0051] Although the present invention has been described in detail above by general description and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention all belong to the scope of protection claimed by the present invention.

Claims

1. A novel fuel cooling and heat dissipation system for an engine, comprising an engine (1) and a fuel tank (2), wherein the engine is provided with a fuel injector (3), and the fuel tank is connected to the fuel injector via a fuel delivery pipe for delivering fuel to the engine, characterized in that: A cooling channel is provided on the engine; The fuel cooling system also includes a fuel pump (4) capable of providing circulation power for the fuel, the fuel pump adopts a continuously variable electronic pump, the inlet of the fuel pump is connected to the fuel tank and is used to transport the low-temperature fuel in the fuel tank to the fuel pump, the outlet of the fuel pump is connected to the inlet of the cooling channel and is used to transport the low-temperature fuel output by the fuel pump to the cooling channel, and the outlet of the cooling channel is connected to the fuel tank and is used to realize the reflux of the high-temperature fuel after heat exchange to the fuel tank; Also includes a control system; The control system comprises a first temperature sensor (5) for monitoring the engine temperature, and a controller module (6) having signal processing and control functions, wherein the controller module is connected to the first temperature sensor signal and is used to receive the monitoring signal generated by the first temperature sensor, and the controller module is connected to the fuel pump control and is used to control the operating state of the fuel pump; The control system further comprises a second temperature sensor (7) for monitoring the temperature of the fuel in the fuel tank, the second temperature sensor being signal-connected to the controller module; The fuel pump is connected to the fuel tank via a cooling inlet pipe, and a cooling outlet pipe is provided between the cooling channel and the fuel tank; The cooling inlet pipe is in communication with the bottom wall of the oil tank; A fuel supply port is also provided on the bottom wall of the fuel tank, and the fuel delivery pipe is connected to the fuel supply port; A fuel supply area (a) is formed in the fuel tank and around the fuel supply port, where the fuel preferentially enters the fuel delivery pipe, one end of the cooling outlet pipe is connected to the outlet of the cooling channel, and the other end of the cooling outlet pipe is inserted into the fuel tank and disposed in the fuel supply area; The oil supply port is a funnel-shaped structure; One end of the cooling outlet pipe inserted into the fuel tank is inserted from the bottom wall of the fuel tank and adopts an elbow structure; The cooling inlet pipe is in communication with the bottom wall of the fuel tank, and the second temperature sensor is arranged on the bottom wall of the fuel tank and close to the cooling inlet pipe; A defoaming device for defoaming the fuel is arranged in the cooling outlet pipe.

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