JP2018123830A - Fuel vapor treatment device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel vapor treatment device capable of inhibiting liquid such as water from entering a treatment device body filled with an adsorbent for adsorbing fuel vapor.SOLUTION: An atmosphere release pipe 7 of a charcoal canister 1 is covered with a cap 8 from the upper side. An upper wall 81 of the cap 8 opposes to an upper end of the atmosphere release pipe 7, leaving a gap. A side wall 82 of the cap 8 surrounds the lateral side of the atmosphere release pipe 7. On the side wall 82, an air intake port 84 is formed at a position lower than the upper end of the atmosphere release pipe 7 in a penetrating manner. A barrier 85 extending from the upper wall 81 of the cap 8 is formed between the atmosphere release pipe 7 and the air intake port 84. A lower end of the barrier 85 is located at a position vertically lower than the air intake port 84. A water discharge port 86 is formed at a lower end of the side wall 82 by notching the lower end.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a fuel vapor processor for treating fuel vapor.

  A vehicle equipped with an internal combustion engine is equipped with a charcoal canister capable of adsorbing and temporarily storing the fuel vapor generated in the fuel tank in order to prevent the fuel vapor from being released into the atmosphere. ing.

  The charcoal canister is filled with charcoal (activated carbon). Further, the charcoal canister is provided with an emission port through which fuel vapor flows from the fuel tank, a purge port for purging the fuel, and an air release port opened to the atmosphere.

  When the fuel in the fuel tank evaporates when the internal combustion engine is stopped or operating, the fuel vapor flows into the charcoal canister via the emission port when the pressure in the fuel tank rises above a certain pressure. The fuel component in the fuel vapor flowing into the charcoal canister is adsorbed by the charcoal and temporarily stored in the charcoal. As a result, the fuel component is removed from the fuel vapor, and the air is released from the charcoal canister to the atmosphere through the atmosphere opening port.

  On the other hand, during operation of the internal combustion engine, external air is taken in from the open air port due to the negative pressure generated in the intake system of the internal combustion engine based on the purge request, and the fuel stored in the charcoal passes through the purge port with the external air. Sent to.

JP 2001-152972 A

  Since the air release port is open to the atmosphere, for example, when the vehicle travels on a submerged channel, there is a possibility that water is sucked into the charcoal canister from the air release port together with outside air. When water is sucked into the charcoal canister, the charcoal is deteriorated early, and the adsorbability of the fuel vapor by the charcoal is lowered, so that the fuel vapor may be released to the atmosphere. Further, if the water sucked into the charcoal canister flows into the internal combustion engine through the purge port, the internal combustion engine may be damaged.

  An object of the present invention is to provide a fuel vapor treatment device that can prevent liquid such as water from entering a treatment device body filled with an adsorbent that adsorbs fuel vapor.

  In order to achieve the above object, a fuel vapor processor according to the present invention is a fuel vapor processor for treating fuel vapor generated in a fuel tank for storing fuel of an internal combustion engine, and adsorbs fuel vapor. Purging the fuel from inside the processor main body, the processor main body filled with the adsorbent to be used, the emission port provided in the main body of the processor and the communication port and the fuel tank. A purge port that extends upward from the processing unit main body, communicates with the inside of the processing unit main body, has an upper end that is open to the atmosphere, and covers the upper side of the atmospheric release pipe from above, And a cap having a side wall portion surrounding the side of the atmosphere release pipe, and an air intake port penetrates the side wall portion of the cap at a position lower than the upper end of the atmosphere release pipe. Formed The upper wall portion of the cap has a barrier that extends from the upper wall portion between the air release pipe and the air intake port and whose lower end is located at the same position as the air intake port or lower than the air intake port in the vertical direction. The drain outlet is formed by cutting out a part of the lower end at the lower end of the side wall of the cap.

  According to this configuration, the processor main body is filled with the adsorbent that adsorbs the fuel vapor. When fuel vapor is generated in the fuel tank and the pressure in the fuel tank is increased to a predetermined pressure or more, the fuel vapor flows into the processor main body through the emission port. The fuel vapor (fuel component) that has flowed into the processor main body is adsorbed by the adsorbent and temporarily stored in the adsorbent. The air from which the fuel component has been removed is released from the inside of the processor main body to the atmosphere through the atmosphere open pipe.

  During operation of the internal combustion engine, air (outside air) is taken into the main body of the processor from the atmospheric open pipe due to a negative pressure generated in the intake system of the internal combustion engine based on a purge request for control. At this time, the fuel stored in the adsorbent is separated from the adsorbent and sent to the internal combustion engine through the purge port together with the outside air.

  A cap is covered from above the air release pipe. The upper wall portion of the cap is opposed to the upper end of the air release pipe with a gap. The side wall portion of the cap surrounds the side of the atmosphere release pipe. An air intake is formed through the side wall at a position lower than the upper end of the atmosphere release pipe. A barrier extending from the upper wall portion of the cap is formed between the air release pipe and the air intake. The lower end of the barrier is located at the same position as or lower than the air intake in the vertical direction.

  Thereby, at the time of operation of the internal combustion engine, air can be taken into the cap from the air intake port, and the air taken into the cap can be flowed into the processor main body through the atmosphere release pipe. Moreover, since the cap is covered with the atmosphere release pipe, it is possible to prevent liquid such as water from entering the atmosphere release pipe from the upper end of the atmosphere release pipe. Furthermore, even if liquid such as water enters the cap from the air intake port, the barrier can prevent the liquid such as water from flowing between the upper end of the atmosphere release pipe and the upper wall portion of the cap. . Therefore, it can suppress that liquids, such as water, enter the inside of a processor main part through an atmosphere open pipe. As a result, it is possible to suppress the deterioration of the adsorbent and the failure of the internal combustion engine.

  When the convex part which protrudes upwards from the upper surface of a processor main body is formed in the side of a cap, it is preferable that the air intake is formed in the position which faces a convex part.

  Since the air intake port is formed at a position facing the convex portion, it is possible to prevent liquid such as water from entering the cap from the air intake port without obstructing the inflow of air from the air intake port into the cap. . As a result, liquid such as water can be further suppressed from entering the processor main body through the open air pipe.

  ADVANTAGE OF THE INVENTION According to this invention, it can suppress that liquids, such as water, enter a processor main body through an air release pipe. As a result, it is possible to suppress the deterioration of the adsorbent and the failure of the internal combustion engine.

It is a top view of the charcoal canister which concerns on one Embodiment of this invention. FIG. 2 is a cross-sectional view of the charcoal canister taken along section line AA shown in FIG. 1.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a plan view of a charcoal canister 1 according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of the charcoal canister 1 taken along section line AA shown in FIG.

  The charcoal canister 1 is provided in a vehicle equipped with an internal combustion engine, and adsorbs and temporarily stores the fuel vapor generated in the fuel tank in order to suppress the release of the fuel vapor to the atmosphere. .

  The charcoal canister 1 includes a canister body 2, a convex portion 3, an emission port 4, a purge port 5, an air release port 6, an air release pipe 7 and a cap 8.

  The canister body 2 is formed in a hollow, substantially rectangular parallelepiped shape. The canister body 2 is filled with charcoal (activated carbon) 9 as an adsorbent that adsorbs fuel vapor.

  The convex portion 3 is formed integrally with the canister body 2. The convex portion 3 is provided at a position offset to one side in the longitudinal direction of the upper surface of the canister body 2 and has a cylindrical outer shape protruding upward from the upper surface of the canister body 2.

  The emission port 4 is formed integrally with the convex portion 3. The emission port 4 has a tubular shape that penetrates the center of the upper surface of the convex portion 3 and extends inward and outward of the convex portion 3. The outer portion of the emission port 4 that protrudes to the outside of the convex portion 3 is bent in the middle and extends in parallel with the upper surface of the canister body 2. One end of an emission pipe (not shown) communicating with the inside of the fuel tank is fitted on the outer portion. A portion of the emission port 4 accommodated in the convex portion 3 extends linearly toward the canister body 2. The emission port 4 communicates with the canister body 2.

  The purge port 5 is formed in a tubular shape that extends in the vertical direction on the side of the convex portion 3, bends in the middle, and extends in parallel with the upper surface of the canister body 2. One end of a purge pipe (not shown) communicating with the intake system of the internal combustion engine is fitted on the tip of the purge port 5. The purge port 5 communicates with the canister body 2.

  The air release port 6 is formed integrally with the canister body 2. The air release port 6 is formed in a tubular shape extending in the vertical direction on the side of the convex portion 3. The atmosphere release port 6 communicates with the canister body 2.

  The atmosphere release pipe 7 has a lower end fitted to the atmosphere release port 6 and extends above the atmosphere release port 6. The upper end 71 of the atmosphere release pipe 7 is opened upward.

  The cap 8 covers the atmosphere opening pipe 7 from above. The cap 8 has a shape that does not interfere with the convex portion 3, and is suspended from the upper wall portion 81 that is spaced from the upper end 71 of the atmosphere release tube 7 and spaced from the upper wall portion 81. A cylindrical side wall portion 82 is integrally provided.

  The convex portion side portion 83 disposed on the convex portion 3 side of the side wall portion 82 faces the outer surface of the convex portion 3 with a gap. An air intake 84 is formed through the convex portion 83 at a position lower than the upper end 71 of the atmosphere opening pipe 7. A drainage port 86 is formed between the lower end of the convex portion 83 and the upper surface of the canister body 2.

  On the lower surface of the upper wall portion 81, a plate-like barrier 85 is formed integrally with the upper wall portion 81 between the atmosphere opening pipe 7 and the convex portion side portion 83. The barrier 85 extends downward from the lower surface of the upper wall portion 81 and has a lower end positioned at a position lower than the air intake port 84 in the vertical direction.

  According to the above configuration, when fuel vapor is generated in the fuel tank and the pressure in the fuel tank is increased, the fuel vapor flows into the canister body 2 through the emission port 4. The fuel vapor (fuel component) flowing into the canister body 2 is adsorbed by the charcoal 9 and temporarily stored in the charcoal 9. The air from which the fuel component has been removed is released from the canister body 2 to the atmosphere through the atmosphere release port 6 and the atmosphere release pipe 7.

  During the operation of the internal combustion engine, air (outside air) is taken into the canister body 2 from the atmospheric open pipe 7 by the negative pressure generated in the intake system of the internal combustion engine based on the purge request for control. At this time, the fuel stored in the charcoal 9 leaves the charcoal 9 and is sent to the internal combustion engine through the purge port 5 together with the outside air.

  A cap 8 is covered on the atmosphere opening pipe 7 from above. The upper wall portion 81 of the cap 8 is opposed to the upper end of the atmosphere release pipe 7 with a gap. The side wall portion 82 of the cap 8 surrounds the side of the atmosphere release pipe 7. An air intake 84 is formed through the side wall portion 82 at a position lower than the upper end of the atmosphere release pipe 7. A barrier 85 extending from the upper wall portion 81 of the cap 8 is formed between the atmosphere opening pipe 7 and the air intake 84. The lower end of the barrier 85 is located at a position lower than the lower end edge of the air intake port 84 in the vertical direction.

  Thereby, at the time of operation of the internal combustion engine, air can be taken into the cap 8 from the air intake 84, and the air taken into the cap 8 can be caused to flow into the canister body 2 through the atmosphere release pipe 7. In addition, since the cap 8 is covered with the atmosphere release pipe 7, it is possible to prevent liquid such as water from entering the atmosphere release pipe 7 from the upper end of the atmosphere release pipe 7. Further, even if a liquid such as water enters the cap 8 from the air intake 84 into the cap 8, the liquid such as water is interposed between the upper end of the atmosphere release pipe 7 and the upper wall portion 81 of the cap 8 by the barrier 85. Inflow can be suppressed. Then, a liquid such as water that falls between the side wall portion 82 and the barrier 85 is drained through a drain port 86 that opens to the convex portion 3 side. Therefore, liquid such as water can be prevented from entering the canister main body 2 through the air release pipe 7. As a result, deterioration of charcoal 9 and failure of the internal combustion engine can be suppressed.

  Further, a convex portion 3 protruding from the upper surface of the canister body 2 is formed on the side of the cap 8, and the air intake 84 is formed at a position facing the convex portion 3.

  Since the air intake 84 is formed at a position facing the convex portion 3, a liquid such as water enters the cap 8 from the air intake 84 without obstructing the inflow of air from the air intake 84 into the cap 8. Can be suppressed. As a result, liquid such as water can be further prevented from entering the canister main body 2 through the air release pipe 7.

  As mentioned above, although one Embodiment of this invention was described, this invention can also be implemented with another form.

  For example, although the lower end of the barrier 85 is positioned at a position lower than the lower end edge of the air intake 84 in the vertical direction, the lower end of the barrier 85 is in the vertical direction with the lower end edge of the air intake 84. You may form so that it may be located in the same position. When the lower end of the barrier 85 is located at a position lower than the lower end edge of the air intake 84, when a liquid such as water enters the cap 8 from the lower side of the cap 8, the barrier 85 and the atmosphere release pipe 7 are used. Water easily enters between the two, and if a liquid such as water enters between them, the water may be sucked into the atmosphere opening pipe 7 together with the atmosphere. On the other hand, in a configuration in which the lower end of the barrier 85 is positioned at the same position in the vertical direction as the lower end edge of the air intake 84, liquid such as water that has entered the cap 8 from the air intake 84 enters the atmosphere release pipe 7. While being able to suppress this, the distance from the lower side of the cap 8 to the lower end of the barrier 85 can be gained with respect to the ingress of liquid such as water into the cap 8, and the liquid is drained from the air intake 84. can do. Therefore, liquid such as water can be effectively prevented from entering the atmosphere opening pipe 7.

  In addition, various design changes can be made to the above-described configuration within the scope of the matters described in the claims.

1 Charcoal canister (fuel steam processor)
2 Canister body (Processor body)
3 Convex 4 Emission port 5 Purge port 7 Atmospheric release pipe 8 Cap 9 Charcoal (adsorbent)
71 Upper end (upper end of open air pipe)
81 Upper wall portion 82 Side wall portion 84 Air intake port 85 Barrier

Claims (2)

A fuel vapor processor for processing fuel vapor generated in a fuel tank for storing fuel of an internal combustion engine,
A processor body filled with an adsorbent that adsorbs fuel vapor;
An emission port provided in the processor main body for communicating the inside of the processor main body and the fuel tank;
A purge port provided in the processor body for purging fuel from within the processor body;
An atmosphere release pipe extending upward from the processor main body, communicating with the inside of the processor main body, and having an upper end opened to the atmosphere;
A cap having a top wall covering the atmosphere opening pipe from above, an upper wall portion facing the upper end of the atmosphere opening pipe with a space therebetween, and a side wall surrounding the side of the atmosphere opening pipe;
In the side wall portion of the cap, an air intake port is formed penetrating at a position lower than the upper end of the atmosphere release pipe,
The upper wall portion of the cap extends from the upper wall portion between the atmosphere opening pipe and the air intake port, and a lower end thereof is at the same position as the air intake port in the vertical direction or lower than the air intake port. A barrier located at a position is formed,
A fuel vapor processor, wherein a drain outlet is formed by cutting out a part of the lower end at the lower end of the side wall of the cap. On the upper surface of the processor main body, on the side of the cap, a convex portion protruding upward is formed,
The fuel vapor processor according to claim 1, wherein the drain port is formed at a position facing the convex portion.

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