PULSATION DAMPING STRUCTURE FOR FUEL TRAILS

Abstract

Structure for pulsation damping for fuel rails (1) comprising the following parts: a fuel rail (1) of a vehicle, a rail connector (100, 1100) provided at an end section of the fuel rail (1) to maintain the airtightness of the fuel rail (1), and a pulsation damping part (200, 1200) on the rail connector (100, 1100) to dampen a pulsation generated during fuel inflow, the rail connector (100, 1100) comprising the following parts: a plug body (110, 1110) which is connected by sliding into an end section of the fuel rail (1), and a fuel reflection part (120, 1120) which is provided in a direction in which the fuel flows in and is concave in the direction of the fuel flow, whereby the fuel flowing in along the fuel rail (1) is reflected and concentrated, wherein The pulsation damper section (200, 1200) comprises the following parts: a turbulence generator part (210) which is provided in the fuel inflow direction of the fuel reflection part (120, 1120) to generate turbulence in the fuel reflected by the fuel reflection part (120, 1120), and a connecting bridge (220) which is connected to the turbulence generator part (210) and is provided such that the turbulence generator part (210) is connected to the plug body (110, 1110).

Description

[Technical area of ​​the invention]

[0001] The present invention relates to a structure for pulsation damping for fuel rails, specifically to a structure for pulsation damping for fuel rails, so that a pulsation arising during the fuel flow in a fuel rail that supplies fuel to the engine of a vehicle is dampened. [Technical background of the invention]

[0002] In general, a vehicle's fuel system is a system for continuously supplying fuel injected into an engine's combustion chamber in an appropriate quantity according to the degree of drive control of the engine, and is designed so that fuel, which is normally pumped by suction from a fuel tank along a pipeline by a fuel pump, can be injected through the multiple injectors by circulating it in several injectors that are installed in an engine's combustion chamber.

[0003] Furthermore, it is designed such that a sedimentation device and a fuel filter are installed on a pipeline between the fuel tank and the fuel pump to perform sedimentation and filtration of foreign substances, etc., and a feed pipe connected from the fuel pump to another pipeline is connected to the multiple injectors.

[0004] Such a fuel supply pipe of a fuel injection device for vehicles is therefore used to ensure that not only is the fuel pressure always kept constant by the pressure regulator provided on one side of the fuel supply pipe when, after an engine has been started, the fuel stored in a fuel tank is pumped by the fuel pump and supplied in the fuel supply pipe, but also that suitable fuel injection can take place insofar as each fuel injector injects the fuel one after the other by setting an electrical pulse time at the fuel injector by an output signal entered into the ECU (electronic control unit) according to the load state of the engine.

[0005] This means that an injector repeatedly injects fuel periodically. The injector receives the injection signal from the ECU, and the injector needle is activated. Simultaneously, the pressure in the fuel supply line drops by the amount of fuel injected, and fuel is continuously supplied to the fuel supply line to maintain pressure. This is why a pulsation occurs due to the repeated fuel injection and fuel supply to the fuel supply line.

[0006] At the same time, when pulsation occurs, there are problems with irregular injections in the injector, resulting in irregular combustion of the fuel and unstable engine performance.

[0007] This pulsation generated in the fuel supply pipe represents one of the most problematic points in the development of a vehicle, and to improve these problems, an insulator and a damper are added to the fuel hose line, or various other methods have been tried.

[0008] (Patent specification) KR 10 1 189 371 B1 (Registration date: 02.10.2012): Injector cup structure for reducing pulsation

[0009] DE 198 37 120 A1 discloses a fuel distributor. DE 198 05 024 A1 discloses a pressure damper for a pressure vessel. JP 2000 - 320 422 A discloses a fuel supply line. FR 2 891 875 A3 discloses an injection device for an internal combustion engine. [Content of the invention][Purpose of the invention]

[0010] The present invention is made to improve upon the problems described above of the conventional structure for pulsation damping for fuel rails, and it is an objective of the present invention to offer a structure for pulsation damping for fuel rails wherein the pulsations generated during the fuel flow are reduced by generating turbulence or eddy currents.

[0011] To achieve the above objective, a pulsation damping structure for fuel rails according to the present invention is characterized in that it comprises the following parts: a fuel rail of a vehicle, a rail connector provided at an end section of the fuel rail to maintain the airtightness of the fuel rail, and a pulsation damping part on the rail connector to dampen a pulsation generated during fuel inflow, wherein the rail connector comprises the following parts: a connector body that is slidably connected into an end section of the fuel rail, and a fuel reflection part that is provided in a direction in which the fuel flows in and is concave in the direction of fuel inflow, thereby reflectively concentrating the fuel flowing along the fuel rail.The pulsation damper part comprises the following parts: a turbulence generator part, which is provided in the fuel inflow direction of the fuel reflection part to generate turbulence in the fuel reflected by the fuel reflection part, and a connecting bridge, which is connected to the turbulence generator part and is provided in such a way as to connect the turbulence generator part to the plug body.

[0012] Furthermore, it is also possible that the turbulence generator part is concave in the direction of the fuel reflection part, whereby the turbulence is generated by reflecting the fuel reflected by the fuel reflection part back again.

[0013] Furthermore, it is also possible that the connecting bridge comprises the following parts: a first bent part, which is formed with a plurality of the turbulence generator part projecting in the radial direction and is designed in such a way that it is bent in the direction of the rail connector; an extension part, which extends from the first bent part in the direction of the rail connector; a second bent part, which is formed bending outwards in the radial direction from the extension part; and a connecting part, which extends from the second bent part and is connected to the rail connector.

[0014] Furthermore, it is also possible that the length of the extension section is shorter than the focal length corresponding to the curvature of the fuel reflection section. Additionally, it is possible that the connector body has a multitude of connecting grooves along its circumference, allowing the connecting bridge to be inserted.

[0015] In a further aspect of the present invention, in order to achieve the above objective, it is also possible that in a structure for pulsation damping for fuel rails according to the present invention the pulsation damping part is designed to project from the fuel reflection part in the direction of the fuel flow, thereby generating the eddy currents in the fuel flowing along the fuel rail.

[0016] Furthermore, it is also possible that in one direction towards the inflow of fuel, the pulsation damping part is indeed formed in the form of a pointed spheroid, but has a diameter that is smaller than the diameter of the fuel reflection part. [Effects of the invention]

[0017] As described above, one effect is to dampen the pulsation, since, as a result of a pulsation damping structure for fuel rails according to the present invention, the turbulence is caused by reflecting the incoming fuel and the eddy currents are generated in the incoming fuel. [Brief description of the invention]

[0018] They show: Fig. 1: A perspective view of a fuel rail in a structure for pulsation damping of fuel rails according to an embodiment of the present invention. Fig. 2: a perspective view of a connection of a connector for rail and a pulsation damper part in a structure for pulsation damping for fuel rails according to an embodiment of the present invention. Fig. 3: A perspective view of a rail connector in a structure for pulsation damping for fuel rails according to an embodiment of the present invention. Fig. 4: A perspective view of a pulsation damper part in a structure for pulsation damping for fuel rails according to an embodiment of the present invention. Fig. 5: a perspective view of a connection of a connector for rail and a pulsation damper part in a structure for pulsation damping for fuel rails according to another embodiment of the present invention. Fig. 6: A concept diagram illustrating the principle of turbulence generation of a structure for pulsation damping for fuel rails according to an embodiment of the present invention. Fig. 7: a concept diagram to explain a vortex generation principle of a structure for pulsation damping for fuel rails according to another embodiment of the present invention. Fig. 8: a flow analysis diagram showing a fuel flow within a fuel rail to which a fuel rail pulsation damping structure is applied according to an embodiment of the present invention. Fig. 9: a flow analysis diagram showing a fuel flow within a fuel rail to which a fuel rail pulsation damping structure is applied according to another embodiment of the present invention. [Examples of the invention]

[0019] Preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0020] Referring to Fig. 1, Fig. 2 to Fig. 3 comprises a structure for pulsation damping for fuel rails according to an embodiment of the present invention, comprising a fuel rail 1, a rail connector 100 and a pulsation damping part 200. Furthermore, the rail connector 100 is provided at an end section of the fuel rail 1 (the end section on the side against which the fuel flows from the fuel tank), and the pulsation damping part 200 is connected to the rail connector 100.

[0021] The fuel rail 1 is designed in the form of a pipe to be connected, through which the fuel stored in a fuel tank (not shown in the drawings) of a vehicle flows into the engine (not shown in the drawings) of the vehicle. In the present embodiment, the fuel rail 1 is used in a GDI engine, where it stores the fuel transferred by a high-pressure pump (not shown in the drawings) and is connected to an injection device to inject the fuel into the cylinder of the engine (not shown in the drawings). However, it is not limited to this and includes a pulsation-generating fuel rail for a vehicle.

[0022] The rail connector 100 comprises a connector body 110 and a fuel reflection element 120. Furthermore, the connector body 110 is designed to be inserted into the fuel rail 1. In the present embodiment, the connector body 110 is indeed cylindrical, but it is not limited to this shape and is also designed to conform to the shape of the fuel rail 1.

[0023] Furthermore, in the present embodiment, a plurality of connecting grooves 111 are formed along the circumferential direction, whereby the pulsation damper part 200 is inserted into the plug body 110.

[0024] The fuel reflection element 120 is connected to the connector body 110 and is concave in the direction of fuel flow. That is, the fuel reflection element 120 is arranged at an end section of the fuel rail 1 and is shaped similarly to a concave mirror, directed against the direction of fuel flow.

[0025] Referring to Fig. 3 and Fig. 4 the pulsation damper part 200 is connected to the rail connector 100 and is arranged inside the fuel rail 1 and comprises a turbulence generator part 210 and a connecting bridge 220.

[0026] The turbulence generator part 210 is arranged on the rail connector 100 in the direction of fuel flow and is positioned opposite the fuel reflection part 120. Furthermore, the turbulence generator part 210 is concave relative to the fuel reflection part 120. That is, the fuel reflection part 120 and the turbulence generator part 210 are shaped similarly to a concave mirror and are positioned opposite each other.

[0027] The connecting bridge 220 is designed to connect the rail connector 100 and the turbulence current generation part 210. That is, the connecting bridge 220 extends from the turbulence generator part 210 and is inserted into the connecting grooves 111 of the connector body 110.

[0028] Furthermore, the connecting bridge 220 comprises a first bent section 221, an extension section 222, a second bent section 223, and a connecting section 224. In addition, a plurality of the first bent sections 221 project radially from the turbulence generator section 210 and are bent in the direction of the connector for rail 100, wherein in the first bent section 221 the extension section 222 extends in the direction of the connector for rail 100. While it is preferred that the length D of the extension section 222 be shorter than the focal length F of the fuel reflection section 110 (D < F) according to the curvature of the fuel reflection section 110, this is not limited.The second bent part 223 is formed to bend outwards in a radial direction from the extension part 222, and the connecting part 224 is received into the connecting groove 111 of the plug body 110 by extending radially from the second bent part 223.

[0029] Referring to Fig. To describe the pulsation damping effect of the structure for fuel rails according to an embodiment of the present invention, as described in Figures 1 to 4 and 6, the fuel reaches the rail connector 100 provided at an end section of the fuel rail 1 when it flows along the fuel rail 1. Furthermore, since the fuel reflection element 120 is formed on the rail connector 100, the fuel is reflected on the concave surface of the fuel reflection element 120. That is, the fuel particles moving linearly along the fuel rail 1 collide with the fuel reflection element 120 and move towards the focal point according to the curvature of the fuel reflection element 120.

[0030] Therefore, turbulence is generated because the fuel particles reflected by the fuel reflection element 120 collect and collide with each other. As a result, the pulsation is reduced. Furthermore, in the present invention, the fuel reflected by the fuel reflection element 120 collides again with the turbulence generator element 210. In addition, in the present embodiment, the length D of the extension section 222 of the connecting bridge 220 is shorter than the focal length F, which corresponds to the curvature of the fuel reflection element 120, so that turbulence arises between the fuel reflection element 120 and the turbulence generator element 210. Consequently, one effect is to minimize the influence on the fuel injection, as the pulsation at the end section of the fuel rail 1 is dampened.

[0031] Furthermore, the effect of generating turbulence is enhanced by also making the turbulence generator part 210 concave in the present embodiment in order to concentrate the fuel reflected by the turbulence generator part 210 even further.

[0032] In Fig. Figure 8 is a flow analysis diagram showing a fuel flow (case 1) within a fuel rail to which a fuel rail pulsation damping structure according to an embodiment of the present invention is applied, compared to a fuel flow (reference) within a conventional fuel rail.

[0033] At the in Fig. In the conventional fuel rail shown in Figure 8, it is observed that a fuel flow (light area: flow velocity of 20 m / s or more) has returned towards the inlet opening, just as a fuel flow (dark area: flow velocity of 30 m / s or more) is entering near the inlet opening. In particular, it can be observed that, because a large quantity of fuel has returned, the fuel flow is significantly bent. In contrast, it is evident that inside the fuel rail to which the present invention is applied, the fuel flow returning towards the inlet opening (light area) is relatively weak, and the flow of incoming fuel is relatively little bent.

[0034] At the same time, it is evident that, when considering the end section of the fuel rail towards the rail connector, the darkened area within the fuel rail to which the present invention is applied is widely distributed compared to the conventional fuel rail. The dark area within the fuel rail indicates that the fuel flow rate is slow (from 0 m / s or more to 1 m / s or less) and that pulsation is reduced due to the slow flow rate.

[0035] Therefore, according to the present embodiment, one effect is that the pulsation is reduced, since the turbulence in the fuel flowing along the fuel rail 1 is generated by the fuel reflection part 120 and the turbulence generator part 210.

[0036] In Fig. 1 and Fig. Figure 5 shows a structure for pulsation damping for fuel rails according to another embodiment of the present invention. A structure for pulsation damping for fuel rails according to the present embodiment comprises a fuel rail 1, a rail connector 1100, and a pulsation damping element 1200.

[0037] The rail connector 1100 comprises a connector body 1110 and a fuel reflection element 1120. Furthermore, the connector body 1110 is designed to be inserted into the fuel rail 1. In the present embodiment, the connector body 1110 is cylindrical, but not limited to this shape and is also shaped to match the form of the fuel rail 1.

[0038] The fuel reflection element 1120 is connected to the connector body 1110 and is concave in the direction of fuel flow. That is, the fuel reflection element 1120 is arranged at an end section of the fuel rail 1 and is shaped similarly to a concave mirror, directed against the direction of fuel flow.

[0039] The pulsation dampener part 1200 is formed in the direction of fuel inflow, in the form of a pointed spheroid, relative to the fuel reflection part 1120. That is, in the present embodiment, the pulsation dampener part 1200 projects axially from the fuel reflection part 1120 in the direction of fuel inflow, with the projecting shape resembling the end section of a rugby ball (see Figure 1). Fig. 5) Furthermore, since the diameter of the pulsation damping part 1200 is smaller than the diameter of the fuel reflection part 1120 in the present embodiment, a convex shape of the pulsation damping part 1200 is formed projecting into the concave surface of the fuel reflection part 1120 (See Figure 1). Fig. 7).

[0040] Referring to the Fig. 1, Fig. 5 and Fig. Section 7 describes an effect of the structure for pulsation damping of fuel rails according to the present embodiment. The fuel flowing along the fuel rail 1 flows on the curved surface of the pulsation damper part 1200 in the form of a pointed spheroid. Furthermore, since the shape of the curved surface of the pulsation damper part 1200 results in a difference in flow velocity between the fuel particles, and consequently eddy currents are generated, the effect is that the pulsation is reduced.

[0041] Furthermore, in the present embodiment, an effect can consist of the fact that, in addition to the sufficient space in which eddy currents are generated in the fuel, the eddy currents are intensified along the concave curved surface of the fuel reflection part 1120, since the diameter of the pulsation damping part 1200 is smaller than the diameter of the fuel reflection part 1120.

[0042] In Fig. Figure 9 shows a flow analysis diagram of a fuel flow (case 2) within a fuel rail to which a fuel rail pulsation damping structure according to another embodiment of the present invention is applied, compared to a fuel flow (reference) within a conventional fuel rail.

[0043] At the in Fig.In the conventional fuel rail shown in Figure 9, it is observed that a fuel flow (light area: flow velocity of 20 m / s or more) has returned towards the inlet opening, just as a fuel flow (dark area: flow velocity of 30 m / s or more) flows in near the inlet opening. In contrast, inside the fuel rail to which the present invention is applied, the fuel flow returning towards the inlet opening is hardly observable. That is to say, according to the present embodiment, it is evident that, since the return flow of the incoming fuel to the inlet opening is small, the flow imbalance is low.

[0044] At the same time, it is evident that, when considering the end section of the fuel rail towards the rail connector, the darkened area within the fuel rail to which the present invention is applied is widely distributed compared to the conventional fuel rail. This means that the fuel flow rate is slow (from 0 m / s or more to 1 m / s or less) and that the pulsation due to the change in flow velocity is reduced.

[0045] Therefore, according to the present embodiment, one effect is that the pulsation is reduced, since the eddy currents in the fuel flowing along the fuel rail 1 are generated by the fuel reflection part 1120 and the pulsation damping part 1200: Although the present invention is described in detail with reference to exemplary embodiments, it is understood that the invention is not limited to the disclosed exemplary embodiments and that it is apparent to the person skilled in the art that various changes and modifications can be made without deviating from the technical spirit of the present invention and from the equivalent scope of the claims set forth below.

[0046] All simple variations or modifications of the present invention shall be included within the scope of the present invention and the specific scope of protection of the present invention is clearly defined by the attached claims. [List of reference symbols] 1 Fuel rail 100, 1100 rail connectors 110, 1110 plug body 111 Connecting groove 120, 1120 Fuel reflection part 200, 1200 Pulsation damper part 210 Turbulence generator part 220 Connecting bridge 221 first bending part 222 Extension part 223 second bending part 224 Connecting part

Claims

[1] Pulsation damping structure for fuel rails (1) comprising the following parts: a fuel rail (1) of a vehicle, a rail connector (100, 1100) provided at an end section of the fuel rail (1) to maintain the airtightness of the fuel rail (1), and a pulsation damping part (200, 1200) on the rail connector (100, 1100) to dampen a pulsation generated during fuel inflow, the rail connector (100, 1100) comprising the following parts: a plug body (110, 1110) which is connected by sliding into an end section of the fuel rail (1), and a fuel reflection part (120, 1120) which is provided in a direction in which the fuel flows in and is concave in the direction of the fuel flow, whereby the fuel flowing in along the fuel rail (1) is reflected and concentrated, wherein The pulsation damper section (200, 1200) comprises the following parts: a turbulence generator part (210) which is provided in the fuel inflow direction of the fuel reflection part (120, 1120) to generate turbulence in the fuel reflected by the fuel reflection part (120, 1120), and a connecting bridge (220) which is connected to the turbulence generator part (210) and is provided such that the turbulence generator part (210) is connected to the plug body (110, 1110). [2] Pulsation damping structure for fuel rails (1) according to claim 1, characterized by , that the turbulence generator part (210) is concave in the direction of the fuel reflection part (120, 1120), whereby the turbulence is generated by reflecting the fuel reflected by the fuel reflection part (120, 1120). [3] Pulsation damping structure for fuel rails (1) according to claim 1, characterized by, that the connecting bridge (220) comprises the following parts: a first bent part (221) which is formed with a plurality of the turbulence generator part (210) projecting in a radial direction and is designed in such a way that it is bent in the direction of the rail connector (100, 1100), an extension part (222) extending from the first bending part (221) in the direction of the rail connector (100, 1100), a second bent part (223) which is designed to bend outwards in a radial direction from the extension part (222), and a connecting part (224) extending from the second bent part (223) and connected to the rail connector (100, 1100). [4] Pulsation damping structure for fuel rails (1) according to claim 3, characterized by, that the length of the extension part (222) is shorter than the focal length corresponding to the curvature of the fuel reflection part. [5] Pulsation damping structure for fuel rails (1) according to claim 1, characterized by , that a plurality of connecting grooves are formed along the circumferential direction in the plug body (110, 1110), with which the connecting bridge (220) is inserted into the plug body. [6] Pulsation damping structure for fuel rails (1) according to claim 1, characterized by , that the pulsation damper part (200, 1200) is designed to project forward from the fuel reflection part (120, 1120) in the direction of the fuel flow, thereby generating eddy currents in the fuel flowing along the fuel rail (1). [7] Pulsation damping structure for fuel rails (1) according to claim 6, characterized by, that the pulsation damper part (200, 1200) is indeed in the form of a pointed spheroid, but it has a diameter that is smaller than the diameter of the fuel reflection part (120, 1120).

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