JPH08158958A - Processor for evaporation fuel - Google Patents

Abstract

PURPOSE: To smoothly take out liquefied fuel stored in a sump case to the outside regardless of the setting positions of inlet and outlet pipes for evaporation fuel and the arrangement condition of a canister. CONSTITUTION: A relay pipe 4 is erected on the ceiling wall 1a of a canister C, the interior of which is filled with an adsorbent M, a sump case 2 is provided on the ceiling wall 1a in such a manner as to cover the relay pipe 4, an inlet pipe 2b and an outlet pipe 2c are horizontally disposed on the upper part of one side of the sump case 2, and a groove-like passage part 2d connected to an outlet pipe 2c is formed on the upper wall of the sump case 2. A suction member 3 comprising a suction pipe 3a which reaches the ceiling wall 1a and a head part 3d having an orifice 3d is installed on the passage part 2d with the head part 3b fitted therein, and a throttled part of a passage section is formed in the midway of the passage part 2d, whereby at the time of separating fuel adsorbed to the adsorbent M, when the separated fuel passes the passage part 2d through the relay pipe 4, the flow speed is increased to generate negative pressure, so that liquefied fuel stored in the sump case 2 is sucked up by a suction pipe 3a and mixed with gas fuel to be sent to an intake pipe side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device which prevents liquefied fuel from flowing into an adsorbent as a means for treating evaporated fuel generated in a fuel tank of a vehicle engine.

The following two types have been known so far as means for treating the evaporated fuel generated in the fuel tank of a vehicle engine (mainly a gasoline engine). The first one is the fuel tank T as shown in FIG.
Check valve V between the processor and the so-called canister C
₁ is connected by a ventilation passage L ₁ while the canister C is connected by a purge passage L ₂ with a control valve V ₂ interposed in the middle to an intake pipe K so that fuel can be consumed when the vehicle is stopped or running. The evaporated fuel generated in the tank T is guided to the canister C by the ventilation passage L ₁ and adsorbed to the adsorbent M such as activated carbon, and the opening of the control valve V ₂ is controlled according to the operating state of the engine while the vehicle is running. The adsorbed fuel is separated by the outside air flowing in through the air intake port Ca at the bottom end and sent to the intake pipe K.

In the second type, as shown in FIG. 8, the liquid reservoir case W is mounted on the ceiling wall C ₂ of the case body C ₁ of the canister C and the air intake pipe Ca is provided, and the upper wall of the liquid reservoir case W is mounted on the upper wall. An inlet pipe W ₁ connected to the fuel tank via a check valve on the way and an outlet pipe W ₂ connected to the intake pipe via a control valve on the way are provided with the inlet pipe W ₁ positioned on the center side, and inside thereof, cylinder W among which communicates with the outlet pipe W ₂ surrounds the partition walls W ₃ and hole C ₃ bored in the ceiling wall C ₂ close to the ceiling wall C ₂ in the vicinity of the inlet pipe W _1
4 is provided, and a relay pipe W ₅ is provided at a position outside the inner cylinder W ₄ so as to penetrate the ceiling wall C ₂ , and the evaporated fuel generated in the fuel tank when the vehicle is stopped or running is First enter the liquid reservoir chamber W through the inlet pipe W ₁ and then the partition wall W ₃
The liquefied fuel having a high boiling point contained in the evaporated fuel is separated and stored in the case W in the process of passing under the lower side, and only the gaseous fuel is passed through the relay pipe W _{5 to} the adsorbent M in the case body C _1. The adsorbed fuel is desorbed by the outside air flowing in from the pipe-shaped air intake port Ca according to the operating state of the engine when the vehicle is running, and the through hole C ₃ and the outlet pipe W ₂
It is sent to the intake pipe through. (JP-A-5-
(See No. 278480)

[0004]

By the way, the first of the above-mentioned conventional devices has a mechanism for directly adsorbing all of the evaporated fuel generated in the fuel tank to the adsorbent M in the canister. Is adsorbed to the adsorbent M, and the fuel is likely to be diffused from the air intake pipe Ca to the outside, and the liquefied fuel having a high boiling point contained in the evaporated fuel also adheres to the adsorbent M. Adsorbent M
The second type is less likely to cause such an inconvenience, but if it is installed upright as shown in the drawing, the liquefied fuel accumulated in the liquid reservoir case W can be taken out to the outside. _First , the inlet pipe W ₁ must be horizontally placed so that it is below the outlet pipe W ₂ , and the canister C itself must be placed higher than the fuel tank to return the liquefied fuel to the fuel tank. There are restrictions on the setting positions of the inlet and outlet pipes and the arrangement of the canister.

Therefore, the present invention prevents deterioration of the adsorbent in the canister, and at the same time, the liquefied fuel accumulated in the liquid reservoir case is irrespective of the set position of the inlet / outlet pipe of the evaporated fuel and the arrangement of the canister. The purpose is to take it out smoothly and surely.

[0006]

In order to achieve the above object, the present invention has a liquid sump case having an inlet pipe for evaporated fuel and an outlet pipe for separated fuel on a ceiling wall of a case body filled with an adsorbent. As a device for preliminarily separating liquefied fuel and processing evaporative fuel, a relay pipe leading to the inside is erected on the ceiling wall of the case body, and this relay pipe is covered with the above liquid reservoir case An inlet pipe and an outlet pipe are provided on one side of the case, and an upper wall thereof has a passage portion whose one end is continuous with the outlet pipe, and the lower end of the passage portion is close to the ceiling wall of the case main body. A suction member consisting of a suction pipe and a head having an orifice connected to this pipe is attached by fitting the head, and a narrowed portion of the flow passage cross section is provided between the head and the head in the middle of the passage. Formation And that the relay pipe and the suction pipe of the suction member are provided adjacent to each other in the central portion of the liquid storage case, and the upper end surface of the relay pipe is inclined from the inner side toward the outer side. I am trying.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of a canister C according to the present invention will be described below with reference to FIGS. 1 and 2, reference numeral 1 denotes a vertically long, elliptical case body made of a synthetic resin such as nylon or polypropylene. Inside the case body, there is a ceiling wall 1a to a bottom wall at a position closer to one side (left side in the figure) from the center. A partition wall 1c extending up to the vicinity of 1b is provided to form a wide room A and a narrow room B which communicate with each other at the lower part, and the ceiling wall 1a has a stepped portion which covers a narrow room B and has a stepped inner surface. The space is provided with a large number of spacer protrusions 1d, and an air intake port 5
Is provided below the filter member 6 and a plate-shaped cushioning material 7 such as a nonwoven fabric having breathability, urethane resin, and the like. Such a relay pipe 4 is erected and a plate-shaped cushioning material 7 is arranged on the lower side.

The case body 1 is filled with an adsorbent M such as activated carbon over the left and right chambers A and B, and a plate-like cushioning material 7 is formed below the adsorbent M and a metal or synthetic material. The mesh-shaped and lattice-shaped support members 8 made of resin are arranged in an overlapping manner, and the adsorbent M is pressed as required by the spring body 9 arranged between the support member 8 and the bottom wall 1b welded to the lower end of the case body 1. ing.

On the other hand, above the portion of the ceiling wall 1a that covers the large chamber A, there is provided a liquid storage case 2 of the required height and volume which is made of the same synthetic resin as the case body 1 and has a flange on the periphery to open the lower surface. , A relay pipe 4 erected on the ceiling wall 1a
Is airtightly attached by welding means so as to be located in the vicinity of the center of the case, and an inlet pipe 2b and an intake pipe connected to the fuel tank via a hose are attached to one upper part of the liquid storage case 2. An outlet pipe 2c connected to the outlet pipe 2c is provided laterally at an interval, and as shown in FIG. 4, the outlet pipe 2c is continuous with the outlet pipe 2c in the central portion lateral direction of the upper wall 2a of the liquid reservoir case 2 and the lower side is a case. A groove-shaped passage portion 2d that is opened inside is formed so as to project upward.

In addition, in the center of the inside of the liquid reservoir case 2, the same material as that of the case body 1 is used, and the lower end is the upper wall 1 of the case body 1.
A hollow key-shaped head 3b having a suction pipe 3a having a height reaching a and an orifice 3d communicating with the pipe 3a.
And a suction member 3 composed of a flange portion 3c that spreads around is disposed, and the key-shaped head portion 3b thereof is fitted into the passage portion 2d of the liquid reservoir case 2, and the flange portion 3c is formed on the lower surface of the upper wall 2a of the case and The flow passage cross section of the portion S ₂ attached by welding to the lower surface of the base end portion of the outlet pipe 2c and between the upper surface of the key-shaped head portion 3b and the inner wall surface of the groove portion 2d of the case has the upstream side thereof. Is narrower than the flow passage cross section of the portion S ₁ in the passage and the portion S ₃ in the downstream pipe.

Thus, the relay pipe 4 standing upright from the ceiling wall 1a of the case body 1 is present adjacent to the suction pipe 3a, and its height is set according to the amount of liquefied fuel generated by the vehicle type. The upper end surface may be flat if the height of the pipe is sufficient, but the fuel accumulated in the case 2 as shown by the dotted line in FIG. 3 when the vehicle is located on a slope or turns. In consideration of the fact that the liquid surface inclines, and in consideration of the fact that there is little change in the height of the liquid surface in the central portion even if it is inclined, the inclination increases from the inside to the outside (preferably 17 degrees to 20 degrees). In addition, it is desirable that the suction pipe 3a is located in the central portion where there is little change in consideration of the influence of the amount of fuel lifted by the change in the head to the lower end of the pipe due to the inclination of the liquid level. Its height is the suction of fuel As well performed, or the pipe lower end is close to the ceiling wall 1a of the case body 1, the extent to which, as shown reach the ceiling wall 1a, the ceiling wall opposed thereto 1
The portion a is slightly recessed so as to prevent a collision when the liquid storage case 2 is attached and to make a required gap with the lower end of the pipe so that the remaining amount of suction is as small as possible.

In use of the above structure, when the pressure of the fuel vapor generated in the fuel tank when the vehicle is stopped or when the vehicle is running exceeds a certain level, the evaporated fuel is collected from the inlet pipe 2b through the hose member. The high-boiling-point liquefied fuel that has liquefied again in the case 2 and is liquefied in the hose member is separated and remains in the case 2, and only the gaseous fuel passes through the relay pipe 4, and first, the large chamber in the case body 1 is separated. Enter A and partition 1
c into the narrow chamber B through the lower opening of c
Is adsorbed and held by.

When the inside of the intake pipe becomes negative pressure due to the operating state of the engine, it acts on the canister C through the outlet pipe, and the outside air from the air intake port 5 is opposite to the first one. It flows into the narrow room B, then the wide room A,
The fuel adsorbed by the adsorbent M is released, and the ceiling wall 1a
Goes through the relay pipe 4 rising from the inside to enter the liquid reservoir case 2, is guided to the passage portion 2d located above the reservoir case 2 and connected to the outlet pipe 2c, and flows there to flow to the outlet pipe 2c.
It is sent to the intake pipe from.

At this time, since the cross section of the flow passage is narrowed in the portion on the head portion 3b of the suction member 3 in the passage portion 2d, the flow velocity of the separated fuel passing therethrough is higher than that of the other portions and is strong there. Negative pressure is generated, the liquefied fuel accumulated in the liquid reservoir case 2 is sucked up by the suction pipe 3a, atomized by the orifice 3d provided on the head 3b, mixed with the separated fuel, and smoothly and promptly in the intake pipe. Sent to the side.

FIGS. 5 and 6 show another example. In this case, the relay pipe 4 is formed integrally with the case body 1 in a state where the upper wall 2a of the liquid storage case 2 is separated.
Is provided on the ceiling wall 1a so as to surround the upper wall 2a, and on the other hand, a pipe-shaped passage portion 2d continuous to the outlet pipe 2c is provided in the lateral direction of the central portion of the upper wall 2a, and in the middle of the passage portion 2d. , A head 3b provided with an orifice 3d of a suction member 3 having a uniform pipe shape as a whole is inserted from a lower side to a predetermined depth and attached, and is squeezed between the inner wall surface of the passage 2d. A cross section of the flow path is formed, and such an upper wall 2a is welded and fixed to the open end of the case 2, but the separated fuel that has entered the liquid storage case 2 through the relay pipe 4 passes through the passage portion 2d. When passing, the flow velocity increases in the middle of the passage, and the negative pressure generated there causes the liquefied fuel accumulated in the liquid reservoir case 2 to be sucked up by the suction pipe 3a, atomized from the orifice 3d on the head and mixed with the separated fuel, and the intake pipe. The first function sent to the side Not change as an example.

In the above example, the partition wall 1a is provided in the case body 1 to divide the inside into two wide and narrow chambers A and B,
Although the ceiling wall 1a is provided with an air intake opening communicating with the narrow room B, the present invention is not limited to this, and the air intake opening may be provided on the bottom wall without providing a partition wall in the case body as shown in FIG. Although the case body 1 is vertically long and elliptical, it may have any shape such as a circle or a prism, and the material thereof is not limited to synthetic resin and may be light alloy. Further, in the illustrated example, the passage 2d for the separated fuel is stored in the liquid storage case 2
Although it is shown that it is provided so as to project above the upper wall 2a,
This may be provided by increasing the height of the case itself and providing it inside, and by expanding the diameter of the lower end portion of the suction pipe 3a or stretching the net material there, the liquefied fuel is filtered. You may do it.

[0017]

As described above, the present invention is an apparatus for treating vaporized fuel while preliminarily separating the liquefied fuel by providing the liquid storage case on the ceiling wall of the case body filled with the adsorbent. Because it is configured, the case body is placed vertically,
Regardless of the setting state of the canister such as horizontal installation and the installation position of the inlet pipe and the outlet pipe, the liquefied fuel accumulated in the liquid reservoir case is used smoothly and promptly by utilizing the flow velocity of the fuel separated from the adsorbent. It can be taken out to the side, it is easy to set on the vehicle, deterioration of the adsorbent can be prevented, and the suction member is attached to the case as a separate member from the liquid storage case, so the size and passage of the orifice It is easy to set the cross-section of the flow path inside the section appropriately, the carry-out amount of the liquefied fuel can be adjusted according to the vehicle type, and the relay pipe on the ceiling wall and the suction pipe of the suction member are located in the central part of the liquid storage case. If the liquid level of the liquefied fuel in the case is tilted due to the tilting or turning of the vehicle, the height of the liquid level does not change much and the opening end of the relay pipe and the suction pipe The amount of suction can be kept stable, and the upper end surface of the relay pipe is inclined from the inside to the outside so that the maximum liquefied fuel is reached at the inner height of the upper surface of the pipe when the vehicle is horizontal. When the vehicle is tilted, the liquefied fuel will not flow into the case main body through the relay pipe.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an example of the device of the present invention.

FIG. 2 is a plan view thereof.

FIG. 3 is an enlarged sectional view of an upper portion of an example of the device of the present invention.

FIG. 4 is a perspective view of a liquid storage case.

FIG. 5 is an enlarged sectional view of an upper portion of another example.

FIG. 6 is a perspective view of the liquid storage case portion.

FIG. 7 is a vertical cross-sectional view of a conventional device.

FIG. 8 is a vertical cross-sectional view of another conventional device.

[Explanation of symbols]

 1 Case 1a Ceiling wall 1b Bottom wall 1c Partition wall 2 Liquid storage case 2a Upper wall 2b Inlet pipe 2c Outlet pipe 2d Passage part 3 Suction member 3a Suction pipe 3b Head part 3d Orifice 4 Relay pipe 5 Air intake pipe C canister

[Procedure amendment]

[Submission date] September 21, 1995

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction content]

[Document name] Statement

Title: Evaporative fuel treatment device

[Claims]

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device which prevents liquefied fuel from flowing into an adsorbent as a means for treating evaporated fuel generated in a fuel tank of a vehicle engine.

[0002]

2. Description of the Related Art The following two types are known so far as a means for treating evaporated fuel generated in a fuel tank of a vehicle engine (mainly a gasoline engine). The first one is, as shown in FIG. 7, connected to a fuel tank T and a processor, a so-called canister C, by a ventilation passage L _{1 provided} with a check valve V ₁ in the middle, while a canister C is a control valve in the middle. A purging passage L ₂ with V ₂ interposed is connected to the intake pipe K, and the evaporated fuel generated in the fuel tank T when the vehicle is stopped or running is guided to the canister C by the ventilation passage L ₁ to adsorb activated carbon or the like. The agent M is adsorbed and the opening of the control valve V ₂ is controlled according to the operating state of the engine when the vehicle is running, while the adsorbed fuel is desorbed by the outside air flowing from the air intake pipe Ca at the bottom end to the intake pipe K. I try to send it in.

[0003] The second is the intake side of the ceiling wall (evaporated fuel Kiyanisuta C of the case body C ₁ as shown in FIG. 8 one
End wall) The liquid storage case W is mounted on C ₂ and the air intake pipe Ca is provided, and the upper wall of the liquid storage case W is
An inlet pipe W ₁ connected to a fuel tank via a check valve and an outlet pipe W ₂ connected to an intake pipe via a control valve are provided in the middle with the inlet pipe W ₁ positioned on the center side, and the inside thereof has an inlet Ceiling wall C ₂ near the pipe W ₁
Through hole C formed in partition wall W ₃ and ceiling wall C ₂ close to
An inner cylinder W ₄ that surrounds ₃ and communicates with the outlet pipe W ₂ is provided, and a relay pipe W ₅ is provided at a position outside the inner cylinder W ₄ so as to penetrate the ceiling wall C ₂ , and when the vehicle is stopped. The fuel vapor generated in the fuel tank while driving
First, it enters the liquid storage case W from _1, and in the process of passing under the partition wall W ₃ , the liquefied fuel of the high boiling point component contained in the evaporated fuel is separated and stored in the case W, and only the gaseous fuel Is adsorbed to the adsorbent M in the case body C ₁ through the relay pipe W ₅ , and the adsorbed fuel is released by the outside air flowing in from the pipe-shaped air intake pipe Ca according to the operating state of the engine when the vehicle is running. It is sent to the intake pipe through the hole C ₃ and the outlet pipe W ₂ . (JP-A 5-2
(See No. 78480)

[0004]

By the way, the first of the above-mentioned conventional devices has a mechanism for directly adsorbing all of the evaporated fuel generated in the fuel tank to the adsorbent M in the canister. Is adsorbed to the adsorbent M, and the fuel is likely to be diffused from the air intake pipe Ca to the outside, and the liquefied fuel having a high boiling point contained in the evaporated fuel also adheres to the adsorbent M. Adsorbent M
The second one is less likely to cause such an inconvenience, but as shown in the figure, the case body C ₁
Since the liquefied fuel accumulated in the liquid storage case W cannot be taken out by arranging the stand upright, therefore, the inlet pipe W ₁ is placed horizontally so that it is below the outlet pipe W ₂ , and the canister C It must be placed at a position higher than the fuel tank to return the liquefied fuel to the fuel tank, and there are restrictions on the positional relationship between the inlet and outlet pipes and the arrangement of the canister with respect to the fuel tank.

Therefore, the present invention prevents deterioration of the adsorbent in the canister and, at the same time, allows the fuel vapor to enter during use.
For the positional relationship of the outlet pipe and the fuel tank of the canister
That positional states regardless, and an object thereof is to take out the liquefied fuel accumulated in sump case smoothly and reliably to the outside.

[0006]

In order to achieve the above object, the present invention has a liquid sump case having an inlet pipe for evaporated fuel and an outlet pipe for separated fuel on a ceiling wall of a case body filled with an adsorbent. As a device for preliminarily separating liquefied fuel and processing evaporative fuel, a relay pipe leading to the inside is erected on the ceiling wall of the case body, and this relay pipe is covered with the above liquid reservoir case An inlet pipe and an outlet pipe are provided on one side of the case, and a passage portion, one end of which is continuous with the outlet pipe, is formed on the upper wall of the case, and the lower end of the passage portion is close to the ceiling wall of the case body . Or reach
A suction pipe having a suction pipe and a head having an orifice connected to the pipe is attached , and a narrowed portion of the flow passage cross section is formed between the suction pipe and the head in the middle of the passage. Further, the relay pipe and the suction pipe of the suction member are provided adjacent to each other in the central portion of the liquid storage case, and the upper end surface of the relay pipe is inclined from the inner side toward the outer side.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of a canister C according to the present invention will be described below with reference to FIGS. 1 and 2, reference numeral 1 denotes a vertically long, elliptical case body made of a synthetic resin such as nylon or polypropylene. Inside the case body, there is a ceiling wall (that is, evaporation ) at a position closer to one side (left side in the figure) from the center.
One end wall on the fuel intake side 1a to the bottom wall (the other end )
A partition wall 1c extending up to the vicinity of the wall 1b is provided to form a wide chamber A and a narrow chamber B which communicate with each other at the lower part, and the ceiling wall 1a is stepped so that the portion covering the narrow chamber B is slightly elevated. , the inner surface is provided with a number of spacer for projections 1d, the air intake path at a portion covering the narrow chamber B
Type 5 is provided, the nonwoven fabric having a filter member 6 and breathability on its lower side, plate-shaped cushioning material 7 such as urethane resin is disposed to overlap, in part covering the wide chamber A of the ceiling wall 1a is A relay pipe 4, which will be described later, is erected, and a plate-shaped cushioning material 7 is arranged on the lower side.

The case body 1 is filled with an adsorbent M such as activated carbon over the left and right chambers A and B, and a plate-like cushioning material 7 is formed below the adsorbent M and a metal or synthetic material. The mesh-shaped and lattice-shaped support members 8 made of resin are arranged in an overlapping manner, and the adsorbent M is pressed as required by the spring body 9 arranged between the support member 8 and the bottom wall 1b welded to the lower end of the case body 1. There is.

On the other hand, above the portion of the ceiling wall 1a that covers the large chamber A, there is provided a liquid storage case 2 of the required height and volume which is made of the same synthetic resin as the case body 1 and has a flange on the periphery to open the lower surface. , A relay pipe 4 erected on the ceiling wall 1a
Is airtightly attached by welding means so as to be located near the center of the case, and an inlet pipe 2b connected to a fuel tank via a hose member and an intake Outlet pipe 2c connected to a pipe
Are provided so as to extend laterally at intervals, and as shown in FIG. 4, a groove shape in which the lower part of the liquid storage case 2 is continuous with the outlet pipe 2c in the central portion lateral direction of the upper wall 2a and is opened inside the case. 2d is formed so as to project upward.

In addition, in the center of the inside of the liquid reservoir case 2, the same material as that of the case body 1 is used, and the lower end is the upper wall 1 of the case body 1.
A hollow key-shaped head 3b having a suction pipe 3a having a height reaching a and an orifice 3d communicating with the pipe 3a.
And a suction member 3 composed of a flange portion 3c that spreads around is disposed, and the key-shaped head portion 3b thereof is fitted into the passage portion 2d of the liquid reservoir case 2, and the flange portion 3c is formed on the lower surface of the upper wall 2a of the case and The flow passage cross section of the portion S ₂ attached by welding to the lower surface of the base end portion of the outlet pipe 2c and between the upper surface of the key-shaped head portion 3b and the inner wall surface of the groove portion 2d of the case has the upstream side thereof. Is narrower than the flow passage cross section of the portion S ₁ in the passage and the portion S ₃ in the downstream pipe.

Thus, the relay pipe 4 standing upright from the ceiling wall 1a of the case body 1 is present adjacent to the suction pipe 3a, and its height is set according to the amount of liquefied fuel generated by the vehicle type. The upper end surface may be flat if the height of the pipe is sufficient, but the fuel accumulated in the case 2 as shown by the dotted line in FIG. 3 when the vehicle is located on a slope or turns. In consideration of the fact that the liquid surface inclines, and in consideration of the fact that there is little change in the height of the liquid surface in the central portion even if it is inclined, the inclination increases from the inside to the outside (preferably 17 degrees to 20 degrees). In addition, it is desirable that the suction pipe 3a is located in the central portion where there is little change in consideration of the influence of the amount of fuel lifted by the change in the head to the lower end of the pipe due to the inclination of the liquid level. Its height is the suction of fuel As well performed, or the pipe lower end is close to the ceiling wall 1a of the case body 1, the extent to which, as shown reach the ceiling wall 1a, the ceiling wall opposed thereto 1
The portion a is slightly recessed so as to prevent a collision when the liquid storage case 2 is attached and to make a required gap with the lower end of the pipe so that the remaining amount of suction is as small as possible.

When using the case , as shown in FIG.
If the main body 1 is installed upright at a predetermined place in the vehicle,
In both cases, the inlet pipe 2b is in the fuel tank and the outlet pipe 2c is
If the pressure of the fuel vapor generated in the fuel tank when the vehicle is stopped or running becomes equal to or higher than a certain level when the vehicle is connected to the intake pipe , the evaporated fuel passes from the inlet pipe 2b to the liquid storage case 2 through the hose member.
Once inside, the liquefied fuel of the high boiling point component liquefied again in the hose member is separated and remains in the case 2, and only the gaseous fuel passes through the relay pipe 4 and first enters the wide chamber A in the case body 1. It enters, passes through the lower opening of the partition wall 1c, enters the narrow chamber B, and is adsorbed and held by the adsorbent M.

When the inside of the intake pipe becomes negative pressure due to the operating state of the engine, it acts on the canister C through the outlet pipe, and the outside air from the air intake pipe 5 is opposite to the first one. The fuel adsorbed by the adsorbent M flows out into the narrow chamber B and then into the wide chamber A, passes through the relay pipe 4 rising from the ceiling wall 1a, and enters the liquid storage case 2. Exit pipe 2c located above
To the intake pipe through the outlet pipe 2c.

At this time, since the cross section of the flow passage is narrowed in the portion on the head portion 3b of the suction member 3 in the passage portion 2d, the flow velocity of the separated fuel passing therethrough is higher than that of the other portions and is strong there. Negative pressure is generated, the liquefied fuel accumulated in the liquid reservoir case 2 is sucked up by the suction pipe 3a, atomized by the orifice 3d provided on the head 3b, mixed with the separated fuel, and smoothly and promptly in the intake pipe. Sent to the side. This place
If the suction member 3 is a separate member from the liquid storage case 2,
Since it is designed to be attached to the space,
It is easy to appropriately set the flow path cross section in the passage and the passage 2d.
The amount of liquefied fuel taken out can be adjusted according to the type.
It

FIGS. 5 and 6 show another example. In this case, the relay pipe 4 is formed integrally with the case body 1 in a state where the upper wall 2a of the liquid storage case 2 is separated.
Is provided on the ceiling wall 1a so as to surround the upper wall 2a, and on the other hand, a pipe-shaped passage portion 2d continuous to the outlet pipe 2c is provided in the lateral direction of the central portion of the upper wall 2a, and in the middle of the passage portion 2d. , A head 3b provided with an orifice 3d of a suction member 3 having a uniform pipe shape as a whole is inserted from a lower side to a predetermined depth and attached, and is squeezed between the inner wall surface of the passage 2d. A cross section of the flow path is formed, and such an upper wall 2a is welded and fixed to the open end of the case 2, but the separated fuel that has entered the liquid storage case 2 through the relay pipe 4 passes through the passage portion 2d. When passing, the flow velocity increases in the middle of the passage, and the negative pressure generated there causes the liquefied fuel accumulated in the liquid reservoir case 2 to be sucked up by the suction pipe 3a, atomized from the orifice 3d on the head and mixed with the separated fuel, and the intake pipe. function and absorption are sent to the side Function for that member to another member is not changed in the first example.

In the above example, the partition wall 1c is provided in the case body 1 to divide the inside into two wide and narrow chambers A and B,
Although the ceiling wall 1a is provided with the air intake pipe leading to the narrow room B, the invention is not limited to this, and the air intake pipe may be provided on the bottom wall without providing a partition wall in the case body as shown in FIG. Although the case body 1 is vertically long and elliptical, it may have any shape such as circular or rectangular.
The material is not limited to synthetic resin and may be light alloy. Further, in the illustrated example, the passage portion 2d for the separated fuel is provided so as to project above the upper wall 2a of the liquid storage case 2, but this is provided by increasing the height of the case itself and providing it inside. Alternatively, the liquefied fuel may be filtered by expanding the diameter of the lower end of the suction pipe 3a or by expanding the diameter of the lower end without expanding the diameter.

[0017]

As described above, the present invention is an apparatus for treating vaporized fuel while preliminarily separating the liquefied fuel by providing the liquid storage case on the ceiling wall of the case body filled with the adsorbent. Because it is configured, put the case body vertically
Set by state can be taken out smoothly and rapidly intake pipe side liquefied fuel flow rate by utilizing accumulated in sump case of withdrawal fuel from the adsorption agent, the case at the time of use
The height of the main body with respect to the fuel tank and the inlet and outlet pipes
There is no need to consider the vertical relationship, it is easy to set to the vehicle, it is possible to prevent the deterioration of the adsorbent, and the relay pipe on the ceiling wall and the suction pipe of the suction member are adjacent to the central part in the liquid storage case. With this configuration, even if the liquid level of the liquefied fuel in the case is tilted due to the tilting or turning of the vehicle, the change in the liquid level is small and the suction amount from the open end of the relay pipe and the suction pipe is large. Can be kept in a stable state, and the upper end surface of the relay pipe is inclined from the inside to the outside so that the maximum liquefied fuel is accumulated at the height of the inner end of the upper surface of the pipe when the vehicle is horizontal. With this configuration, even if the vehicle leans, the liquefied fuel does not flow into the case body through the relay pipe.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an example of the device of the present invention.

FIG. 2 is a plan view thereof.

FIG. 3 is an enlarged sectional view of an upper portion of an example of the device of the present invention.

FIG. 4 is a perspective view of a liquid storage case.

FIG. 5 is an enlarged sectional view of an upper portion of another example.

FIG. 6 is a perspective view of the liquid storage case portion.

FIG. 7 is a vertical cross-sectional view of a conventional device.

FIG. 8 is a vertical cross-sectional view of another conventional device.

[Explanation of reference numerals] 1 case body 1a ceiling wall 1b bottom wall 1c partition wall 2 liquid storage case 2a upper wall 2b inlet pipe 2c outlet pipe 2d passage portion 3 suction member 3a suction pipe 3b head portion 3d orifice 4 relay pipe 5 air intake Pipe C canister

Claims (3)

[Claims] 1. A liquid reservoir case having an inlet pipe for evaporated fuel and an outlet pipe for separated fuel is provided on a ceiling wall of a case main body filled with an adsorbent, and vaporizes while preliminarily separating liquefied fuel. In a device for processing fuel, a relay pipe leading to the inside is erected on the ceiling wall of the case body, the relay pipe is covered with the liquid storage case, and an inlet pipe and an outlet pipe are provided on one side of the liquid storage case. In addition, the upper wall thereof has a passage portion whose one end is continuous with the outlet pipe, and the lower end of the passage portion has a suction pipe which is close to or reaches the ceiling wall of the case body and an orifice which communicates with the suction pipe. An apparatus for treating evaporated fuel, characterized in that a suction member consisting of is attached by fitting its head portion, and a narrowed portion of the flow passage is formed between the head portion and the head portion in the middle of the passage portion. 2. The apparatus for treating evaporated fuel according to claim 1, wherein the relay pipe and the suction pipe of the suction member are provided adjacent to each other in the central portion of the liquid storage case. 3. The upper end surface of the relay pipe is inclined so that the height increases from the inner side to the outer side.
Alternatively, the evaporated fuel processing device according to claim 2.