KR102261138B1 - A method of eliminating particles in fuel rail and a fuel rail adopting the method - Google Patents

Abstract

In order to solve problems caused by foreign materials entering an injector in a fuel rail module of a vehicle fuel system, proposed are a method for preventing foreign materials from leaking into the injector by removing foreign materials from a fuel in a fuel rail and a fuel rail adopting the method. According to one aspect of the present invention, provided is a method for eliminating foreign materials by converting the flow direction of a fuel to the direction of gravity and the opposite direction of gravity at least once before entering an injector cup, when the fuel (including foreign materials) flows into the injector cup in a pipe (fuel passage) of a fuel rail. On the converted flow direction of the fuel, there may be included a foreign material accumulation chamber for allowing foreign materials in the fuel to be precipitated and separated by their own weight (effect of gravity) during the flow of the fuel.

Description

A method of removing foreign matter from a fuel rail and a fuel rail to which this method is applied {A method of eliminating particles in fuel rail and a fuel rail adopting the method}

The present invention relates to a technology for preventing foreign substances from being introduced into an injector by removing foreign substances in fuel from a fuel rail.

An automobile engine is equipped with a fuel rail that receives fuel from a fuel tank and delivers it to a fuel injector (injector). According to one type of the conventional fuel rail, as shown in FIG. 1A, an inlet connector 10 through which fuel is introduced by a high-pressure pump from a fuel tank (not shown), a fuel rail body 20 forming a fuel passage, and a fuel rail body A plurality of injector cups 30 arranged at regular intervals on the outside of 20 to supply fuel to the plurality of injectors 40 are included.

1B is a cross-sectional view taken along section A-A of FIG. 1A in order to see the internal structures of the fuel rail body 20 and the injector cup 30 . The fuel rail body 20 has a fuel outlet 22 through which fuel is discharged from the internal passage 21 . The injector cup 30 has a fuel inflow path 31 that is connected to the fuel outlet 22 and introduces fuel into the upper portion 32 of the injector cup 30, and the injected fuel is collected before entering the injector 40. There is an injector cup space (33). The arrows in FIG. 1B indicate the flow of fuel.

The injector is a sensitive element with a very small gap between each part because precise fuel amount control is required. Accordingly, there are many problems caused by foreign substances flowing into the injector. Foreign substances that may be introduced together when fuel is supplied to each injector include the following.

- fuel impurities

- Foreign substances generated during refueling and refining (foreign substances in fuel itself)

- Foreign substances generated during the manufacturing of each part including the high-pressure pump

- Foreign substances generated by friction between metal parts during operation

If these foreign substances enter through the fuel rail and are delivered to the injector, it may cause deterioration of injector durability.

As described above in the fuel rail module of an automobile fuel system, a method for preventing foreign substances from leaking into the injector by removing foreign substances in the fuel from the fuel rail in order to solve the problem when foreign substances are introduced into the injector, and a fuel rail to which this method is applied suggest

In order to solve the above problems, according to one aspect of the present invention, when fuel (including foreign substances) flows from the pipe (fuel passage) of the fuel rail to the injector cup, before the flowing fuel enters the injector cup, at least once or more Provided is a method for removing foreign substances by converting a flow direction of fuel in a direction of gravity and a direction opposite to gravity.

The flow direction of the converted fuel may include a foreign material accumulation chamber for allowing foreign substances in the fuel to be precipitated and separated by their own weight (effect of gravity) while the fuel flows.

In addition, in order to increase the foreign material removal efficiency, the foreign material removal method of the present invention may include the following additional steps.

- The fuel from which foreign substances have been primarily removed from the foreign material accumulation chamber flows upward along the exchange path formed upward. Here, the direction of the flow path is the opposite direction of gravity, and therefore, foreign substances that are not completely separated from the foreign substance accumulation chamber are additionally separated by their own weight while moving upward through the flow path.

- The fuel that flows to the top along the flow path enters the upper part of the injector cup, passes through the foreign material filter on the upper part of the injector cup, and flows into the injector. Residual foreign substances in the fuel are finally filtered by this foreign material filter.

In addition, according to another aspect of the present invention, the foreign matter accumulation chamber that enters before the fuel exits the fuel passage and enters the injector cup 300 - In the foreign matter accumulation chamber, the foreign matter is first separated by sedimentation by gravity; Met oil passage that allows the fuel from which foreign substances are primarily separated to rise again against gravity - Foreign substances that are not completely separated from the foreign material accumulation chamber are additionally separated by their own weight while the fuel is moving upward through the exchange oil path; There is provided a fuel rail including a foreign material filter through which the fuel is introduced into the injector cup space after the residual foreign material in the fuel that has risen along the flow path is further filtered.

The configuration and operation of the present invention introduced above will become clearer through specific embodiments described later with drawings.

Advantageous Effects of Invention According to the present invention, various problems including deterioration of injector durability caused by foreign substances leaked from the fuel rail entering the injector are solved.

In addition, vibration of the high-pressure sensor is reduced, particularly in a fuel system corresponding to a high-pressure system pressure of 200 bar or more, and fine monitoring of the injector supply pressure can be ensured.

1A is an exemplary view of a conventional fuel rail type;
Fig. 1b is a cross-sectional view taken along line AA of Fig. 1a;
2 is an external configuration diagram of a fuel rail to which a foreign material removal method according to the present invention is applied;
3 is a cross-sectional view taken along line BB of FIG.
4 is an enlarged view of part C of FIG. 3
5 is a cross-sectional view EE of FIG.
6 is an enlarged view of part D of FIG. 3

Advantages and features of the present invention and methods of achieving them will become apparent with reference to the detailed description in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different forms, only this embodiment allows the disclosure of the present invention to be complete, and those of ordinary skill in the art to which the present invention pertains. It is provided to fully inform the person of the scope of the invention, and the present invention is defined by the description of the claims. On the other hand, the terms used herein are for the purpose of describing the embodiment, not intended to limit the present invention. As used herein, the singular also includes the plural unless specifically stated otherwise in the phrase. As used herein, 'comprise' or 'comprising' refers to the presence or absence of one or more other components, steps, operations and/or elements other than the stated elements, steps, acts and/or elements. addition is not excluded.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In adding reference numerals to the components of each drawing, the same components are given the same reference numerals as much as possible even if they are shown on different drawings, and in explaining the present invention, detailed descriptions of related known components or functions In the case where the gist of the present invention may be obscured, the detailed description thereof will be omitted.

First, the method for removing foreign substances in fuel in a fuel rail according to the present invention is performed as follows.

Fuel (including foreign substances) flows from the pipe (fuel passage) of the fuel rail to the injector cup. Before the flowing fuel enters the injector cup, foreign substances in the fuel are deposited by their own weight (the effect of gravity) in the foreign substance accumulation chamber and are first separated.

The fuel from which foreign substances have been primarily removed from the foreign material accumulation chamber flows upward along the exchange path formed upward. Here, the direction of the flow path is the opposite direction of gravity, and therefore, foreign substances that are not completely separated from the foreign substance accumulation chamber are additionally separated by their own weight while moving upward through the flow path.

The fuel flowing to the top along the flow path enters the upper part of the injector cup, passes through the foreign material filter on the upper part of the injector cup, and flows into the injector. Residual foreign substances in the fuel are finally filtered by this foreign material filter.

As a result, foreign matter is removed several times from the fuel passage of the fuel rail until it flows into the injector cup.

Next, a fuel rail to which the above-described foreign matter removal method is applied will be described.

2 is an external configuration diagram of a fuel rail to which the above-described foreign material removal method is applied. Similar to the conventional fuel rail, fuel from the fuel tank by the high-pressure pump 50 enters the fuel rail body 200 through the inlet connector 100 into each injector 400 through a plurality of injector cups 300 . is supplied

Figure 3 is a cross-sectional view taken along line B-B of Figure 2 to see the internal structure of the fuel rail of the present invention. A configuration and operation of an embodiment of the present invention will be schematically described with reference to FIG. 3 .

Although there is a fuel passage 210 that is a space within the fuel rail body 200 as in FIG. 1B , in this embodiment, fuel comes out of the fuel passage 210 and passes through the foreign material accumulation chamber 310 before entering the injector cup 300 . Goes. In the foreign material accumulation chamber 310, the foreign material is precipitated by gravity and is first separated. The fuel from which the foreign material is primarily separated goes up along the gas flow path 320 against gravity again and arrives at the communication channel 330 in the upper part of the injector cup space 350 . Here, since the direction of the exchange passage 320 is from the bottom to the top, the foreign matter that is not completely separated from the foreign matter accumulation chamber 310 while the fuel is moving upward through the exchange passage 320 is secondarily separated by its own weight. .

The fuel moved to the upper part of the injector cup 300 along the flow path 320 enters the injector cup space 350 through the foreign material filter 340 and is finally supplied to the injector. In spite of the separation of the primary and secondary foreign substances, the remaining foreign substances remaining in the fuel are finally filtered by the foreign substances filter 340 .

Hereinafter, the configuration and operation of the embodiment of the present invention will be described in detail with reference to the detailed drawings.

FIG. 4 is an enlarged view of part C of FIG. 3 .

Here, the foreign material accumulation chamber 310 is located below the lowermost portion of the fuel outlet through which the fuel comes out of the fuel passage 210 . That is, an approximately middle or lower portion of the foreign material accumulation chamber 310 is in contact with the wall 230 of the fuel rail body 200, and fuel enters an upper portion of the foreign material accumulation chamber 310 (refer to the fuel flow path indicated by an arrow). . In the lower space of the foreign material accumulation chamber 310, the foreign material (P) contained in the fuel settles down by gravity. In this way, the foreign material (P) is precipitated by gravity and the fuel separated primarily is again flowed to the upper part of the foreign material accumulation chamber 310 and is formed in an upward direction through the foreign material accumulation chamber outlet 360. It goes up through the passage and enters the communication passage 330 mentioned in the description of FIG. 3 (and then enters the injector cup 300 ). Before entering the communication passage 330 , the foreign matter remaining in the fuel while passing through the return passage 320 falls down by its own weight and sinks into the foreign matter accumulation chamber 310 .

The metal flow path 320 and its related structure will be described in more detail with reference to FIG. 5 . FIG. 5 is a cross-sectional view taken along line E-E of FIG. 4 .

In FIG. 5 , there is a foreign material accumulation chamber 310 at the bottom, and it can be seen that the foreign material is settled in this chamber. On both sides of the foreign material accumulation chamber 310, two round flow passages 320 are formed in the upward direction, and the two round flow passages 320 are connected to the uppermost communication passage 330.

As shown in FIG. 4 , the fuel enters the foreign material accumulation chamber 310 and the foreign material P is first precipitated by gravity, and then is pushed by the pressure of the new fuel that is continuously introduced and rides the gas flow path 320 to counter the gravity. After the foreign matter is additionally separated as it goes up, it enters the upper part of the injector cup 300 from the uppermost communication channel 330 (refer to the fuel flow path indicated by the arrow).

In FIG. 5, the metal flow path 320 is formed so as to rise in the shape of two arcs. However, alternatively, for example, a form in which one round flow path 320 is vertically raised from the foreign material accumulation chamber 310 is also possible.

After the foreign substances are first separated from the foreign matter accumulation chamber 310 , the bottom surface of the foreign matter accumulation chamber 310 is mounted on the foreign matter accumulation chamber 310 in order to implement the action that the fuel rises upward against gravity on the foreign matter accumulation chamber 310 . It should be positioned higher than the floor. This requirement will be clearly understood through Fig. 4, which is an enlarged view of the rectangular portion of Fig. 3 . In addition, the height difference between the bottom surface of the foreign material accumulation chamber 310 and the bottom surface of the flow path 320 is shown as K in FIG. 5 .

Next, the communication passage 330 will be described in detail with reference to FIG. 6 . FIG. 6 is an enlarged view of part D of FIG. 3 .

As shown in FIGS. 4 and 5 , the fuel (fuel in which foreign substances are primary and secondary separated) is transferred to the upper part through the foreign material accumulation chamber 310 through the exchange passage 320 into the space in the injector cup through the communication passage 330 . Before entering (350), it passes through the foreign material filter (340). Residual foreign substances in the fuel are additionally filtered by the foreign material filter 340 , enters the injector cup 300 , and is supplied to the injector.

As mentioned above, although the configuration of the present invention has been described in detail through preferred embodiments of the present invention, those of ordinary skill in the art to which the present invention pertains will appreciate that the present invention is disclosed in the present specification without changing its technical spirit or essential features. It will be understood that the present invention may be implemented in a specific form other than the above. It should be understood that the embodiments described above are illustrative in all respects and not restrictive. The protection scope of the present invention is defined by the claims described below rather than the above detailed description, and all changes or modifications derived from the claims and their equivalent concepts should be construed as being included in the technical scope of the present invention. .

Claims (10)

A method of removing foreign substances contained in fuel from a fuel rail including a fuel passage through which fuel introduced from a fuel tank passes, and an injector cup through which fuel passes through the fuel passage to supply fuel to an injector, the method comprising:
when fuel flows from the fuel passage to the injector cup, before the fuel enters the injector cup, changing the direction of flow of the fuel in the direction of gravity and in the opposite direction of gravity at least once. Way. The method according to claim 1, wherein when the flow direction of the fuel is changed from a direction of gravity to a direction opposite to that of gravity, foreign substances contained in the fuel are separated from the fuel by gravity. The foreign material accumulation chamber is formed at a position where the flow direction of the fuel is switched from the gravity direction to the opposite gravity direction, and the foreign material separated from the fuel by the gravity is accumulated in the foreign material accumulation chamber. How to remove foreign substances from fuel rails. The fuel rail according to claim 1, wherein the flow direction of the fuel is changed from the direction of gravity to the direction opposite to gravity, passes through a foreign material filter located on the upper part of the injector cup, and then enters the injector cup after the foreign material is additionally filtered. How to remove foreign substances from In the fuel rail comprising a fuel passage through which fuel introduced from a fuel tank passes, and an injector cup through which fuel passing through the fuel passage flows in order to supply fuel to the injector,
a foreign material accumulation chamber in which the fuel enters before it exits the fuel passage and enters the injector cup, and the foreign material contained in the fuel is first separated and accumulated by gravity;
a gas flow path through which the fuel from which the foreign material is primarily separated flows from the foreign material accumulation chamber to the injector cup in a direction opposite to gravity;
and a foreign substance filter for allowing fuel to flow into the injector cup after additionally filtering residual foreign substances in the fuel flowing along the exchange path. The method of claim 5, wherein the foreign matter accumulation chamber is
Fuel rail, characterized in that the fuel is located below the lowermost part of the fuel outlet from the fuel passage, and the foreign material is deposited and accumulated in the lower space of the foreign material accumulation chamber by gravity. The fuel rail according to claim 5, wherein, when fuel flows in the opposite direction of gravity through the flow path, foreign substances not separated from the foreign substance accumulation chamber are secondarily separated by gravity. [6] The fuel rail according to claim 5, wherein there is at least one metal oil path. The fuel rail according to claim 5, wherein the bottom surface of the met-flow passage is higher than the bottom surface of the foreign material accumulation chamber. The fuel rail according to claim 5, further comprising a communication passage through which fuel flowing from the foreign material accumulation chamber in a reverse direction of gravity through the return passage enters the foreign material filter.

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