KR100709934B1 - Fuel supply apparatus of engine - Google Patents

Abstract

(Problem) The transmission sound outside the fuel tank accompanying the operation sound of the fuel pump can be reduced, and the fuel breakage generated at the liquid level fluctuation when the fuel level is low or when the vehicle is turned can be prevented with a simple structure. Providing a fuel supply for the engine.

(Solution means) In the LPG fuel supply device 10 in which the fuel pump 11 is provided in the fuel tank 20, the fuel pump 11 is covered with the container-shaped structures 30 and 40, and the container-shaped structure 30, The fuel passages 31 and 41 formed in each of the 40 are shifted in the circumferential direction, and the fuel passage 31 is disposed at a position higher than the fuel passage 41. In addition, the vapor extraction holes 32 and 42 are alternately arranged.

Description

FUEL SUPPLY APPARATUS OF ENGINE}

1: is a figure which shows schematic structure of the LPG fuel supply apparatus which concerns on 1st Embodiment, (a) is a top view, (b) is sectional drawing in the A-A line shown to (a).

2 is an external view showing a schematic configuration of an LPG fuel supply device according to the first embodiment.

FIG. 3 is a view showing a liquid level variation in a fuel tank when acceleration occurs in the front-rear direction when the fuel residual amount is small.

FIG. 4 is a diagram showing a state of liquid level variation in the fuel tank when acceleration occurs in the lateral direction when the fuel residual amount is small.

FIG. 5: is a figure which shows schematic structure of the LPG fuel supply apparatus which concerns on 2nd Embodiment, (a) is a top view, (b) is sectional drawing in the A-A line shown to (a).

FIG. 6: is a figure which shows schematic structure of the LPG fuel supply apparatus which concerns on 3rd Embodiment, (a) is a top view, (b) is sectional drawing in the A-A line shown to (a).

Explanation of symbols on the main parts of the drawings

10: LPG Fuel Supply

11: fuel pump

12: inlet

13: discharge port

20: fuel tank

30, 40: container-shaped structure

31, 41: fuel passage

32, 42: vapor ejection hole

33, 43: soundproof member

34, 44: sound insulation board

Literature Information of the Prior Art

[Patent Document 1] Japanese Unexamined Patent Publication No. 2000-297713 (pages 3 to 4, FIGS. 1 and 2)

The present invention relates to an engine fuel supply device for supplying fuel to an engine. More particularly, the present invention relates to a fuel supply apparatus of an in-tank type engine provided with a fuel pump in a fuel tank.

Background Art Conventionally, an in tank type device in which a fuel pump is installed in a fuel tank is known as a fuel supply device for an engine. As this kind of fuel supply apparatus, there is a thing disclosed in Japanese Unexamined Patent Publication No. 2000-297713, for example. In the fuel supply device disclosed herein, a fuel pump is provided in a vessel-shaped structure formed in the fuel tank, and the fuel passage of the vessel-shaped structure has a maze structure. As a result, the fuel supply device can stably supply fuel.

However, when the fuel pump is provided in the fuel tank, there is a problem that the operation sound of the pump (such as the armature of the motor or the impeller of the pump agitating the fuel) is radiated so that the sound is transmitted out of the fuel tank. In particular, when liquefied gas fuel is used as the fuel, the fuel tank for storing the liquefied gas fuel is required to have pressure resistance, and a metal cylinder is used. Therefore, when the fuel pump is installed in the fuel tank, the operation sound of the pump is radiated. Resonance in the fuel tank makes the transmission more loud. In other words, if the fuel supply device is applied to the fuel supply device for liquefied gas as it is, the transmission sound through which the operation sound of the fuel pump penetrates out of the fuel tank is large, which causes problems in terms of noise.

In the case of the in-tank type fuel supply device, when there is little fuel remaining in the fuel tank, the fuel pump may not be supplied well when the liquid level is changed or when the vehicle is turned. have. Therefore, in the fuel supply apparatus, the fuel passage is a labyrinth structure so that fuel breakage does not occur. However, in order to obtain a labyrinth structure, the fuel passage had to be complicated.

Accordingly, the present invention has been made to solve the above problems, and can reduce the permeation out of the fuel tank accompanying the operation sound of the fuel pump, and at the time of liquid level fluctuation when the fuel residual amount is small or when turning the vehicle. An object of the present invention is to provide a fuel supply device for an engine that can prevent a fuel cutoff caused by a simple structure.

A fuel supply apparatus for an engine according to the present invention made to solve the above problems is a fuel supply apparatus for an engine for supplying fuel in the fuel tank to an engine by a fuel pump installed in a fuel tank in which fuel is accommodated. Is covered with multiple vessel-shaped structures, and the fuel passages formed in each of the multiple vessel-shaped structures are arranged to be shifted in the circumferential direction.

The outermost layer of the multiple vessel-shaped structures may be fixed to the fuel tank.

In the fuel supply device of this engine, the fuel pump installed in the fuel tank is covered by multiple vessel-shaped structures. As a result, the operation sound of the fuel pump is silenced. Each of these multiple vessel-shaped structures is provided with a fuel passage in which a fuel tank and a fuel pump communicate with each other and serve as a passage for fuel. The fuel passages formed in the respective vessel-shaped structures are arranged to be shifted in the circumferential direction. In short, each fuel passage is not arranged linearly. Thereby, since the space of the innermost vessel-shaped structure and the space of the outer side of the outermost vessel-shaped structure are not directly communicated (it is a maze structure), the operation sound of the fuel pump passes out of the fuel tank through the fuel passage. The transmitted sound can be made small.

Moreover, in this fuel supply apparatus, the labyrinth structure is obtained by arrange | positioning the fuel path provided in each container-like structure in the circumferential direction. In short, complex construction is not necessary to obtain a maze structure. The labyrinth structure obtained by displacing the fuel passages formed in the respective container-like structures in the circumferential direction can prevent fuel disconnection caused at the liquid level fluctuation when the fuel residual amount is small or when the vehicle is turned. This is because multiple vessel-like structures have the function of a sub tank, so that fuel is less likely to flow out of the vessel-shaped structure even when the liquid level fluctuates when the fuel residual amount is small or when the vehicle is turned.

As described above, in this fuel supply device, a very simple configuration reduces fuel permeation outside the fuel tank associated with the operation sound of the fuel pump, and causes fuel to be generated at the time of liquid level fluctuation when the remaining fuel amount is low or when the vehicle is turned. It can prevent breakage.

In the fuel supply device of the engine according to the present invention, the fuel passage formed in the outermost layer of the multiple vessel-shaped structures is preferably formed at a position higher than the fuel passage formed in the other layer.

By doing so, it is difficult for the fuel to flow out from the inside of the vessel-shaped structure at the time of liquid level fluctuation when the fuel residual amount is small or at the time of turning the vehicle, so that the function of the sub tank in the multiple vessel-shaped structure can be improved. As a result, it is possible to reliably prevent the fuel cutoff generated when the liquid level fluctuates when the fuel residual amount is small or when the vehicle is turned.

Moreover, in the fuel supply apparatus of the engine which concerns on this invention, it is preferable that the soundproof member which passes a fuel is arrange | positioned between the said multiple vessel-shaped structures. Moreover, it is preferable to arrange | position the soundproof member also between a fuel pump and an innermost container structure.

By doing this, the permeation sound outside the fuel tank accompanying the operation sound of the fuel pump can be reduced more effectively. In addition, by disposing the soundproof member between the multiple vessel-shaped structures, it is difficult for the fuel to flow out of the vessel-shaped structure at the time of liquid level fluctuation when the fuel residual amount is small or during vehicle turning. Therefore, the function of the sub tank in multiple container-shaped structures can further be improved.

Moreover, in the fuel supply apparatus of the engine which concerns on this invention, it is preferable that the said soundproof member is formed in the surface shape in unevenness | corrugation or waveform. Thereby, since the sound insulation effect can be improved, the permeation sound outside the fuel tank accompanying the operation sound of a fuel pump can be made small effectively.

Moreover, in the fuel supply apparatus of the engine which concerns on this invention, a sound insulation board is arrange | positioned in the outer side of the said fuel passage formed in the outermost layer among the said multiple vessel-shaped structures, or at least one outer side of the fuel inlet of the said fuel pump. desirable.

By providing the sound insulation plate at the portion where the operation sound of the fuel pump is most permeable in this manner, the transmission sound outside the fuel tank accompanying the operation sound of the fuel pump can be reduced more effectively.

Moreover, in the fuel supply apparatus of the engine which concerns on this invention, it is preferable that the vapor extraction hole formed in each upper part of the said multiple vessel-shaped structure is arrange | positioned alternately.

In the fuel supply device of this engine, the vapor ejection holes formed in the upper portions of the multiple vessel-shaped structures are alternately arranged. In short, each vapor extraction hole is not arrange | positioned linearly. Therefore, the space of the innermost container-like structure and the space outside of the outermost container-like structure are not directly communicated with each other by the vapor ejection hole (it has a maze structure). Thereby, the operation sound of a fuel pump can make small the permeation sound permeate | transmitted out of a fuel tank through a vapor extraction hole.

Best Mode for Carrying Out the Invention

EMBODIMENT OF THE INVENTION Hereinafter, the most preferable embodiment which actualized the fuel supply apparatus of the engine of this invention is described in detail based on drawing. This embodiment applies the fuel supply apparatus of this invention to the apparatus which supplies LPG fuel to a liquefied petroleum gas (LPG) engine.

(1st embodiment)

First, the first embodiment will be described. Therefore, the schematic structure of the LPG fuel supply apparatus which concerns on 1st Embodiment is shown in FIG. 1 and FIG. 1: is a figure which shows schematic structure of LPG fuel supply apparatus, (a) is a top view, (b) is sectional drawing in the A-A line shown to (a). 2 is an external view showing a schematic configuration of an LPG fuel supply device.

The LPG fuel supply apparatus 10 which concerns on this embodiment is an in tank type apparatus in which the fuel pump 11 was provided in the fuel tank 20, as shown to FIG. 1 (b). As shown in FIG. 2, the fuel tank 20 has a metal cylinder shape for storing LPG fuel. This is because pressure resistance is required to store LPG fuel. The LPG fuel supply apparatus 10 is formed in the lower part of this fuel tank 20. As shown in FIG. In addition, the reason why the LPG supply device 10 is slightly obliquely provided with respect to the fuel tank 20 is to secure a space such as a fuel pipe.

As shown in FIG. 1 (b), the LPG fuel supply device 10 includes a fuel pump 11, double vessel-shaped structures 30 and 40 covering the fuel pump 11, and a vessel-shaped structure 30. The cover body 22 which closes the opening part of 40 is provided. The LPG fuel supply device 10 supplies LPG fuel sucked up through the inlet 12 by the fuel pump 11 to the LPG engine (not shown) at a predetermined pressure through the discharge port 13. Here, since the structure of the fuel pump 11 is the same structure as the fuel pump for general gasoline, detailed description is abbreviate | omitted. This fuel pump 11 is fixed to the plate 14. The lid 22 is fixed to the side of the plate 14 on the opposite side to which the fuel pump 11 is mounted. On the other hand, the vessel-shaped structure 40 is fixed to the surface side on which the fuel pump 11 of the plate 14 is mounted. As a result, the fuel pump 11 is covered by the vessel-shaped structure 40.

In addition, the flange 21 is attached to the installation portion of the LPG fuel supply device 10 in the fuel tank 20. The vessel-shaped structure 30 is fixed to the fuel tank 20 side of the flange 21. In other words, the vessel-shaped structure 30 on the outside (outermost layer) is fixed to the fuel tank 20 via the flange 21.

And the fuel pump 11 is installed in the fuel tank 20 by fixing the surface side in which the plate 14 was mounted as the outer peripheral part of the lid | cover body 22 to the flange 21 fixed to the fuel tank 20, It is fixed. The fuel pump 11 is also covered by the vessel-shaped structure 30. As a result, the fuel pump 11 is covered by the double vessel-shaped structures 30 and 40. Therefore, the operation sound of the fuel pump 11 is sound insulation.

In each of these container-shaped structures 30 and 40, fuel passages 31 and 41 and vapor ejection holes 32 and 42 are formed. The fuel passages 31 and 41 are formed below the vessel-shaped structures 30 and 40, and the vapor ejection holes 32 and 42 are formed above the vessel-shaped structures 30 and 40. The reason for forming the fuel passages 31 and 41 and the vapor extraction holes 32 and 42 in this manner is to smoothly fill the LPG fuel in the container-shaped structures 30 and 40. In addition, the fuel passages 31 and 41 formed in each of the container-shaped structures 30 and 40 are arranged to be shifted in the circumferential direction as shown in Fig. 1A. In short, the fuel passage 31 and the fuel passage 41 are not arranged linearly. In addition, the fuel passage 31 formed in the outer vessel-shaped structure 30 is formed at a position higher than the fuel passage 41 formed in the vessel-shaped structure 40 as shown in FIG. 1 (b). In addition, the vapor extraction holes 32 and 42 are mutually arrange | positioned.

For this reason, the space between the inner vessel-shaped structure 40 and the fuel pump 11 and the space outside the outer vessel-shaped structure 30 (in the fuel tank 20) are not directly communicated (in a maze structure). Is). Therefore, the operation sound of the fuel pump 11 can make the permeation sound permeate | transmitted out of the fuel tank 20 via the fuel passage 41 and 31 and the vapor discharge hole 42 and 32 small.

Here, when the permeation sound outside the fuel tank 20 accompanying the operation sound of the fuel pump 11 was examined, the container shapes 30 and 40 were formed (the state which displaced the fuel passages 31 and 41). ), The transmission sound could be reduced by about 8%. And as shown to FIG. 1 (a), the fuel passages 31 and 41 were shift | deviated to the circumferential direction, and the permeation | transmission sound could be made about 6% smaller. In short, according to the LPG fuel supply apparatus 10 which concerns on this embodiment, the permeation | transmission sound outside the fuel tank 20 accompanying the operation sound of the fuel pump 11 was made about 14% small compared with before a countermeasure.

In the LPG fuel supply device 10, the fuel passages 31 and 41 formed in each of the vessel-shaped structures 30 and 40 are shifted in the circumferential direction, and the fuel passage 31 is connected to the fuel passage 41. The maze structure is obtained by arranging at a higher position. Therefore, a complicated configuration is not necessary to obtain a maze structure. And by this maze structure, the LPG fuel supply apparatus 10 has the function of a sub tank. Therefore, when the remaining amount of LPG fuel in the fuel tank 20 decreases, as shown in FIG. 3, the fuel liquid surface in the fuel tank 20 is caused by the acceleration (front and rear G) in the front and rear directions generated by the acceleration or stop of the vehicle. When this fluctuates, the LPG fuel can remain in the vicinity of the intake port 12 of the fuel pump 11. In addition, as shown in FIG. 4, even when the fuel liquid level in the fuel tank 20 is fluctuate | varied by the horizontal acceleration (lateral G) generate | occur | produced at the time of vehicle turning, it is located in the vicinity of the intake port 12 of the fuel pump 11. LPG fuel may remain. In short, even if the fuel residual amount is small, the inlet 12 can always be kept immersed in the LPG fuel. Thus, the LPG fuel supply device 10 can stably supply LPG fuel to the LPG engine even when the fuel residual amount is small.

As described above, in the LPG fuel supply device 10 according to the first embodiment, the fuel pump 11 is covered with the container-shaped structures 30 and 40, and the fuel formed in each of the container-shaped structures 30 and 40. The labyrinth structure can be obtained with a very simple configuration in which the passages 31 and 41 are displaced in the circumferential direction and the fuel passage 31 is disposed at a position higher than the fuel passage 41. In addition, the vapor extraction holes 32 and 42 are alternately arranged. As a result, the space between the inner vessel-shaped structure 40 and the fuel pump 11 and the outer space of the outer vessel-shaped structure 30 (in the fuel tank 20) are not directly communicated with each other. The operation sound of the pump 11 can make the permeation sound permeate | transmitted out of the fuel tank 20 through the fuel passage 41 and 31 and the vapor discharge hole 42 and 32. FIG. Further, even when the fuel residual amount is small, the inlet 12 can always be immersed in the LPG fuel in the fuel tank 20, so that the LPG fuel can be stably supplied to the LPG engine.

(2nd embodiment)

Next, 2nd Embodiment is described. The LPG fuel supply device according to the second embodiment has a basic configuration similar to that of the LPG fuel supply device 10 according to the first embodiment, but differs in that a soundproof member is provided. Therefore, in the following description, it demonstrates centering around difference with 1st Embodiment, and attaches | subjects the same code | symbol about a common point, and abbreviate | omits the description suitably.

So, the schematic structure of the LPG fuel supply apparatus which concerns on 2nd Embodiment is shown in FIG. FIG. 5: is a figure which shows schematic structure of the LPG fuel supply apparatus which concerns on 2nd Embodiment, (a) is a top view, (b) is sectional drawing in the A-A line shown to (a). As shown in FIG. 5, the LPG fuel supply device 10a includes a fuel pump 11, double vessel-shaped structures 30 and 40 covering the fuel pump 11, and soundproof members 33 and 43. It is. The sound insulation members 33 and 43 are formed of the raw material (for example, nonwoven fabric etc.) which let LPG fuel pass. The soundproof member 33 is provided between the vessel-shaped structure 30 and the vessel-shaped structure 40. The soundproof member 43 is provided between the vessel-shaped structure 40 and the fuel pump 11. Thereby, the operation sound of the fuel pump 11 can be effectively sound insulation.

In addition, although the surface of the sound insulation members 33 and 43 may be flat, it is preferable that it is uneven or wavy. This is because the sound insulation effect by the sound insulation members 33 and 43 can be improved.

And when the transmission sound outside the fuel tank 20 accompanying the operation sound of the fuel pump 11 was investigated, LPG which concerns on 1st Embodiment is provided by providing sound insulation members 33 and 43 as shown in FIG. Compared with the fuel supply device 10, the permeation sound could be made about 13% smaller. That is, according to the LPG fuel supply apparatus 10a which concerns on this embodiment, the permeation sound outside the fuel tank 20 accompanying the operation sound of the fuel pump 11 was able to be made about 26% smaller than before measures.

Moreover, by providing the sound insulation members 33 and 43, it becomes difficult to further flow out LPG fuel from the LPG fuel supply apparatus 10a. For this reason, the LPG fuel supply device 10a can stably supply LPG fuel to the LPG engine even when the liquid level fluctuates when the fuel residual amount is small or when the vehicle is turned. In other words, it is possible to reliably prevent the fuel cutoff that occurs when the liquid level fluctuates when the fuel level is low or when the vehicle is turned.

As described above, in the LPG fuel supply device 10a according to the second embodiment, the fuel pump 11 is covered with the container-shaped structures 30 and 40, and the fuel formed in each of the container-shaped structures 30 and 40. The passages 31 and 41 are shifted in the circumferential direction, and the fuel passage 31 is disposed at a position higher than the fuel passage 41 to obtain a maze structure. And the soundproof member 33 is provided between the container-shaped structure 30 and the container-shaped structure 40, and the soundproof member 43 is provided between the container-shaped structure 40 and the fuel pump 11. Thereby, since the operation sound of the fuel pump 11 can be effectively sound-insulated, the permeation sound outside the fuel tank 20 accompanying the operation sound of the fuel pump 11 can be made smaller. In addition, since the LPG fuel is more difficult to flow out from the LPG fuel supply device 10a when the remaining fuel amount is small, the LPG fuel can be supplied to the LPG engine more stably.

(Third embodiment)

Finally, the third embodiment will be described. The LPG fuel supply device according to the third embodiment has a basic configuration similar to that of the LPG fuel supply device 10 according to the first embodiment, but differs in that a sound insulation plate is provided. Therefore, in the following description, it demonstrates centering around difference with 1st Embodiment, and attaches | subjects the same code | symbol about a common point, and abbreviate | omits the description suitably.

So, the schematic structure of the LPG fuel supply apparatus which concerns on 3rd Embodiment is shown in FIG. FIG. 6: is a figure which shows schematic structure of the LPG fuel supply apparatus which concerns on 3rd Embodiment, (a) is a top view, (b) is sectional drawing in the A-A line shown to (a). As shown in FIG. 6, the LPG fuel supply device 10b includes a fuel pump 11, double vessel-shaped structures 30 and 40 covering the fuel pump 11, and sound insulation plates 34 and 44. It is. The sound insulation plate 34 is provided in front of the fuel passage 31 (outer side). The sound insulation plate 44 is provided in front (outside) of the fuel pump 11 inlet 12. In this way, by forming the sound insulation plates 34 and 44 at the portion where the operation sound of the fuel pump 11 is most permeable, the transmission sound outside the fuel tank 20 accompanying the operation sound of the fuel pump 11 is generated. It can be made smaller more effectively.

And when the permeation sound outside the fuel tank 20 accompanying the operation sound of the fuel pump 11 was investigated, as shown in FIG. 6, by providing the sound insulation boards 34 and 44, it concerns with 1st Embodiment. Compared to the LPG fuel supply device 10, the permeation sound could be made about 3% smaller. That is, according to the LPG fuel supply apparatus 10b which concerns on this embodiment, the permeation sound outside the fuel tank 20 accompanying the operation sound of the fuel pump 11 was about 17% smaller than before measures.

As described above, in the LPG fuel supply device 10b according to the third embodiment, the fuel pump 11 is covered with the container-shaped structures 30 and 40, and the fuel formed in each of the container-shaped structures 30 and 40. The passages 31 and 41 are shifted in the circumferential direction, and the fuel passage 31 is disposed at a position higher than the fuel passage 41 to obtain a maze structure. Then, the sound insulating plates 34 and 44 are provided in front of the fuel passage 31 and the inlet 12 of the fuel pump 11 (outer side) where the operation sound of the fuel pump 11 is most permeable. Thereby, since the operation sound of the fuel pump 11 can be effectively sound-insulated, the permeation sound outside the fuel tank 20 accompanying the operation sound of the fuel pump 11 can be made smaller.

In addition, the said embodiment is only a mere illustration, It does not limit this invention at all, It is a matter of course that various improvement and modification are possible in the range which does not deviate from the summary. For example, in the said embodiment, although the 1st-3rd embodiment was illustrated and demonstrated, these can also be combined suitably. Specifically, by combining the second embodiment and the third embodiment, the transmission sound outside the fuel tank 20 accompanying the operation sound of the fuel pump 11 can be made smaller.

In addition, in the said embodiment, although the container-shaped structure was illustrated as being cylindrical, the container-shaped structure is not limited to a cylindrical shape, For example, it may be cylindrical, hemispherical, etc.

In the above embodiment, an example in which the present invention is applied to a fuel supply device for supplying LPG fuel to an engine has been described. However, the present invention is not limited to LPG fuel. For example, liquefied natural gas (LNG), gasoline, It can also be applied to a fuel supply device for supplying light oil, kerosene or the like to an engine.

According to the fuel supply apparatus of the engine according to the present invention, since the fuel pump is covered with multiple vessel-shaped structures, and the fuel passages formed in the respective vessel-shaped structures are alternately arranged, the fuel pump outside the fuel tank accompanying the operation sound of the fuel pump is disposed. It is possible to reduce the permeation noise and to prevent the fuel cutoff generated at the time of liquid level fluctuation when the fuel residual amount is small or at the time of turning the vehicle with a simple structure.

Claims (7)

In the fuel supply apparatus of the engine for supplying the fuel in the fuel tank to the engine by a fuel pump provided in the fuel tank containing the fuel, The fuel pump is covered with multiple vessel-shaped structures, A fuel supply device for an engine, wherein fuel passages formed in each of the plurality of vessel-like structures are arranged to be shifted in the circumferential direction. The fuel supply apparatus for an engine according to claim 1, wherein the outermost layer of the multiple vessel-shaped structures is fixed to the fuel tank. The method according to claim 1 or 2, And the fuel passage formed in the outermost layer of the multiple vessel-shaped structures is formed at a position higher than the fuel passage formed in the other layer. The fuel supply device for an engine according to claim 1 or 2, wherein a soundproof member for passing fuel is disposed between the multiple vessel-shaped structures. 5. The fuel supply device for an engine according to claim 4, wherein the soundproof member is formed with irregularities or corrugations. The sound insulation board according to claim 1 or 2, wherein a sound insulation plate is arranged outside of the fuel passage formed in the outermost layer of the multiple vessel-shaped structures, or at least one of the outside of the fuel inlet of the fuel pump. Fuel supply of the engine. 3. The fuel supply apparatus for an engine according to claim 1 or 2, wherein vapor extraction holes formed in the upper portions of the multiple vessel-shaped structures are alternately arranged.

Images