A two-stage fuel cooling device for laboratory automobile fuel injector testing

Abstract

The application discloses a two-stage fuel cooling device for laboratory automobile fuel injector testing, and relates to the technical field of automobile fuel injector testing equipment. The device comprises an oil circuit system, an oil tank cooling system and a fuel injector cooling system. The oil circuit system comprises an oil tank, a fuel filling pipe, an oil pump, an oil pipeline, an oil injection pipe and four fuel injectors. The oil tank cooling system comprises a cooling coil pipe, and the fuel injector cooling system comprises a water-cooled hollow jacket. The water circulation cooling system pipeline is connected with two first circulation pipe joints and a second pipe joint, and the cooling coil pipe is arranged in the oil tank. The device can continuously cool the inside of the oil tank, avoids the deviation of the initial fuel temperature, and cooperates with the water-cooled hollow jacket of the outer wall of the fuel injector to rapidly cool the fuel injector. The device realizes two-stage cooling of the initial storage position and the end of the fuel, and controls the temperature of the fuel from the storage end to the injection end.

Description

Technical Field

[0001] This invention relates to the field of automotive fuel injector testing equipment, specifically to a two-stage fuel cooling device for laboratory automotive fuel injector testing. Background Technology

[0002] In recent years, with the continuous and in-depth research on the mechanisms of fuel injection, atomization, and mixture formation in automotive engines, precise control of the liquid fuel temperature during injector operation under laboratory conditions has become a key aspect of improving the reliability, repeatability, and data comparability of experiments. Especially in the spray testing, flow characteristic testing, and atomization characteristic evaluation experiments of gasoline direct injection injectors for automobiles, gasoline, as a typical liquid fuel, directly affects its viscosity, surface tension, density, and flow and breakup characteristics due to temperature changes. This, in turn, alters the cavitation flow state, injection stability, and macroscopic spray structure and microscopic atomization characteristics within the injector, thus affecting the ability of experimental results to characterize the engine's real-world operating conditions. Therefore, establishing stable, uniform, and controllable fuel temperature regulation methods during laboratory automotive injector testing has become an important research topic within the relevant experimental technology system.

[0003] Currently, existing solutions for fuel temperature control during injector testing under cold start conditions in laboratory engines mainly include overall temperature control of the fuel reservoir, local temperature control of the fuel delivery pipeline, and temperature control of the injector body's outer wall. Some solutions achieve initial fuel temperature regulation by overall cooling or constant temperature control of the fuel reservoir; some solutions install water jackets, refrigerant heat exchange jackets, or semiconductor refrigeration units on the outside of the fuel delivery pipeline to reduce the temperature rise of the fuel during delivery; and some solutions achieve localized cooling of the injector body by arranging cooling channels or heat dissipation structures on the injector's outer wall, mounting flange, or adjacent area.

[0004] These methods can improve the fuel temperature during cold start testing to some extent. However, when only the fuel tank is cooled as a whole, although the initial fuel temperature can be reduced, the fuel will continue to exchange heat with the ambient air, pipeline walls, mounting brackets and high-pressure components during the process of being transported through the high-pressure fuel pump, high-pressure fuel rail and long-distance fuel pipeline. This will cause the actual temperature of the fuel to reach the injector to deviate, making it difficult to keep the fuel temperature stable before injection. However, when only the outer wall of the injector is cooled, the fuel in the injector area is prone to temperature fluctuations and thermal stratification due to the continuous input of relatively high-temperature fuel from upstream. The cooling effect on the injector is limited, and it is difficult to maintain the stability of the end fuel temperature during continuous fuel injection or long-term durability testing.

[0005] To address the aforementioned issues, we propose a two-stage fuel cooling device for laboratory automotive injector testing. Summary of the Invention

[0006] The purpose of this invention is to provide a two-stage fuel cooling device for laboratory automotive injector testing, in order to overcome the aforementioned shortcomings in the technology.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a two-stage fuel cooling device for laboratory automotive injector testing, comprising a fuel circuit system, a fuel tank cooling system, and an injector cooling system. The fuel circuit system includes a fuel tank, a refueling pipe, a fuel pump, a fuel delivery line, a fuel injection pipe, and four injectors. The fuel tank cooling system includes a cooling coil, and the injector cooling system includes a water-cooled hollow jacket.

[0008] Preferably, the refueling pipe is connected to the outer wall of the top side of the fuel tank, the fuel pump is installed on the bottom side of the fuel tank, the output end of the fuel pump passes through the bottom side of the fuel tank and is connected to one end of the fuel delivery pipeline, the other end of the fuel delivery pipeline is connected to the injection pipe, and four fuel injectors are installed through an opening on the bottom side wall of the injection pipe, and the four fuel injectors are evenly distributed on the bottom side of the injection pipe.

[0009] Preferably, the cooling coil is disposed inside the fuel tank, with both ends of the cooling coil extending to the outside of both ends of the fuel tank, and the outer walls of both ends of the cooling coil are equipped with first circulation pipe joints, which are connected to the vehicle's water cooling system to allow coolant to circulate inside the cooling coil, thereby continuously cooling the fuel in the fuel tank.

[0010] Preferably, two inlet and outlet pipes are installed on one side of the outer wall of the water-cooled hollow jacket through an opening. A second circulation pipe connector is installed on the outer wall of one end of the two inlet and outlet pipes. The two second circulation pipe connectors are connected to the water-cooling system of the vehicle, so that circulating water flows through the inner wall of the water-cooled hollow jacket, thereby cooling the fuel injector.

[0011] Preferably, the water-cooled hollow jacket is installed on the outer wall of the injector, and each side of the outer wall of the water-cooled hollow jacket is equipped with two annular fixing plates. The outer wall of one side of the two annular fixing plates fits against the outer wall of one side of the injector. The outer wall of the water-cooled hollow jacket is also provided with four studs. Fixing holes are opened on the outer walls of both ends of the two annular fixing plates. Nuts are screwed into the inner walls of the fixing holes through the studs. The two annular fixing plates facilitate the fixing of the water-cooled hollow jacket to the outer wall of the injector.

[0012] The technical effects and advantages provided by the present invention in the above technical solution are as follows: The water circulation cooling system is connected to two first circulation pipe joints and a second pipe joint. The cooling coil is installed inside the fuel tank to continuously cool the inside of the fuel tank, preventing deviations in the initial fuel temperature. In conjunction with the water-cooled hollow jacket on the outer wall of the injector, it rapidly cools the fuel. This provides two-stage cooling for the initial fuel storage position and the fuel end, enabling graded temperature control of the fuel from the storage end to the injection end. This reduces the impact on the temperature of the fuel flowing inside the injector and ensures that the fuel temperature remains stable during the test. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the cross-sectional structure of the fuel tank of the present invention; Figure 3 This is a schematic diagram of the injector structure of the present invention; Figure 4 This is a schematic diagram of the water-cooled hollow jacket structure of the present invention.

[0015] Explanation of reference numerals in the attached figures: 1. Fuel tank, 2. Fuel filling pipe, 3. Fuel pump, 4. Fuel delivery line, 5. Fuel injection pipe, 6. Injector, 7. Cooling coil, 8. First circulation pipe joint, 9. Water-cooled hollow jacket, 10. Inlet and outlet pipes, 11. Annular fixing plate, 12. Stud. Detailed Implementation

[0016] The following drawings will disclose several embodiments of the present invention. For clarity, many physical details will be described in the following description. However, it should be understood that these physical details are not intended to limit the invention. That is, in some embodiments of the invention, these physical details are not essential. Furthermore, for the sake of simplicity, some conventional structures and components will be shown in the drawings in a simple schematic manner.

[0017] Furthermore, in this invention, the use of terms such as "first" and "second" is for descriptive purposes only and does not specifically refer to any order or sequence, nor is it intended to limit the invention. They are merely used to distinguish components or operations described using the same technical terms, and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but only if they are feasible for those skilled in the art. If a combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0018] Example 1 Refer to the instruction manual appendix Figure 1-4 A two-stage fuel cooling device for laboratory automotive injector testing includes a fuel system, a fuel tank cooling system, and an injector cooling system. The fuel system includes a fuel tank 1, a filling pipe 2, a fuel pump 3, a fuel delivery pipe 4, a fuel injection pipe 5, and four injectors 6. The fuel tank cooling system includes a cooling coil 7, and the injector cooling system includes a water-cooled hollow jacket 9.

[0019] Example 2 Based on Embodiment 1, the refueling pipe 2 is connected to the outer wall of the top side of the fuel tank 1, the fuel pump 3 is installed on the bottom side of the fuel tank 1, the output end of the fuel pump 3 passes through the bottom side of the fuel tank 1 and is connected to one end of the fuel delivery pipeline 4, the other end of the fuel delivery pipeline 4 is connected to the fuel injection pipe 5, and four fuel injectors 6 are installed through an opening on the bottom side wall of the fuel injection pipe 5. The four fuel injectors 6 are evenly distributed on the bottom side of the fuel injection pipe 5.

[0020] Example 3 Based on Embodiment 1, the cooling coil 7 is installed inside the fuel tank 1, with both ends of the cooling coil 7 extending to the outside of both ends of the fuel tank 1. First circulation pipe joints 8 are installed on the outer walls of both ends of the cooling coil 7, connecting it to the vehicle's water-cooling system. This allows coolant to circulate inside the cooling coil 7, continuously cooling the fuel in the fuel tank 1. Two inlet / outlet pipes 10 are installed on one side of the outer wall of the water-cooled hollow jacket 9 through an opening. Second circulation pipe joints are installed on the outer walls of one end of the two inlet / outlet pipes 10, connecting them to the vehicle's water-cooling system. This allows circulating water to flow through the inner wall of the water-cooled hollow jacket 9, thereby cooling the fuel injector 6.

[0021] Example 4 Based on Embodiment 1, the water-cooled hollow jacket 9 is installed on the outer wall of the injector 6, and each side of the outer wall of the water-cooled hollow jacket 9 is equipped with two annular fixing plates 11. The outer wall of one side of the two annular fixing plates 11 fits against the outer wall of one side of the injector 6. The outer wall of the water-cooled hollow jacket 9 is also provided with four studs 12. The outer walls at both ends of the two annular fixing plates 11 have fixing holes. The studs 12 pass through the inner wall of the fixing holes and are screwed with nuts. The two annular fixing plates 11 facilitate the fixing of the water-cooled hollow jacket 9 to the outer wall of the injector 6.

[0022] Working principle of this invention: Refer to the instruction manual appendix Figure 1-4 When using this invention, the water circulation cooling system pipes of the car are first connected to two first circulation pipe joints 8 and second pipe joints respectively. The cooling coil 7 is installed in the oil tank 1, which can continuously cool the inside of the oil tank 1 and keep the inside of the oil tank 1 at a constant low temperature. (1) Gasoline in a low temperature state is sprayed out from the injector 6 through the fuel supply line 4 and the fuel injection line 5. The injector 6 sprays oil in the car engine and forms a high-pressure flame with the spark plug, which makes the temperature of the injector 6 rise rapidly. At this time, it is cooled down rapidly by the water-cooled hollow jacket 9 included on the outer wall of the injector 6. This device achieves a two-stage cooling effect by simultaneously cooling the initial gasoline in the fuel tank 1 and the fuel injector 6, thereby improving the stability and accuracy of fuel temperature control during laboratory testing of automotive fuel injectors and providing reliable temperature boundary conditions for engine fuel injector performance research.

[0023] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A two-stage fuel cooling device for laboratory automotive injector testing, comprising a fuel circuit system, a fuel tank cooling system, and an injector cooling system, characterized in that: The oil circuit system includes an oil tank (1), a filling pipe (2), an oil pump (3), an oil delivery pipe (4), an injection pipe (5), and four injectors (6). The oil tank cooling system includes a cooling coil (7); The injector cooling system includes a water-cooled hollow jacket (9).

2. The two-stage fuel cooling device for laboratory automotive injector testing according to claim 1, characterized in that: The refueling pipe (2) is connected to the top side outer wall of the oil tank (1). The oil pump (3) is installed on the bottom side of the oil tank (1). The output end of the oil pump (3) passes through the bottom side of the oil tank (1) and is connected to one end of the oil delivery pipeline (4). The other end of the oil delivery pipeline (4) is connected to the injection pipe (5). Four injectors (6) are installed on the bottom side wall of the injection pipe (5) through an opening. The four injectors (6) are evenly distributed on the bottom side of the injection pipe (5).

3. The two-stage fuel cooling device for laboratory automotive injector testing according to claim 1, characterized in that: The cooling coil (7) is located inside the oil tank (1), with both ends of the cooling coil (7) extending to the outside of both ends of the oil tank (1), and the outer walls of both ends of the cooling coil (7) are equipped with first circulation pipe joints (8).

4. The two-stage fuel cooling device for laboratory automotive injector testing according to claim 1, characterized in that: Two inlet and outlet pipes (10) are installed on one side of the outer wall of the water-cooled hollow jacket (9) through an opening, and a second circulation pipe joint is installed on the outer wall of one end of the two inlet and outlet pipes (10).

5. A two-stage fuel cooling device for laboratory automotive injector testing according to claim 1, characterized in that: The water-cooled hollow jacket (9) is installed on the outer wall of the injector (6), and two annular fixing plates (11) are provided on one side of the outer wall of the water-cooled hollow jacket (9). The outer wall of one side of the two annular fixing plates (11) is in contact with the outer wall of one side of the injector (6). The outer wall of the water-cooled hollow jacket (9) is also provided with four studs (12). Fixing holes are opened on the outer walls of both ends of the two annular fixing plates (11). Nuts are screwed into the inner wall of the fixing holes through the studs (12).

Images