JPH04116655U - canister - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent fine activated carbon powder from flowing out from the canister. [Structure] A fuel vapor inlet 2 _IN , a fuel vapor outlet 2 _OUT , and an atmosphere inlet ₃₀ are provided at predetermined locations on the canister case. An activated carbon layer 15 is provided inside the case. Porous partition walls 5, 7, 11 are provided at locations where the activated carbon layer 15 faces the fuel vapor inlet, fuel vapor outlet, and air inlet in the case.
will be established. The partition walls are made by hardening activated carbon containing pulverized activated carbon into a sheet shape through a binder. Even if fine powder is generated in the activated carbon due to vibration, etc., the partition wall prevents it from flowing out of the case.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention captures fuel vapor generated from the fuel system of an internal combustion engine and releases it into the atmosphere. This invention relates to a canister that prevents the spread of water.

0002

[Conventional technology]

The canister collects fuel components that vaporize from the fuel tank or carburetor when the engine is stopped. It is adsorbed by the adsorbent inside the case, and air flows into the case from outside when the engine is running. The fuel components are desorbed from the adsorbent and sent to the engine for combustion. The canister is designed to prevent fuel vapor and outside air from escaping to prevent the adsorbent from flowing out of the case. A filter is installed inside the case to block the inlet while maintaining ventilation.

0003

[Problem that the idea aims to solve]

However, conventional filters are made of fine mesh such as woven fibers. The activated carbon powder passes through the filter and exits the canister. There are cases. In other words, the activated carbon is pulverized inside the canister due to vibrations when the vehicle is running, and this It leaks out of the canister from between the meshes of the filter.

0004 In this way, when the activated carbon flows out of the case, the capacity of the activated carbon decreases, so Therefore, the adsorption/desorption function is significantly reduced. Also, when the amount of activated carbon decreases, it creates voids inside. Similarly, there is a problem that powderization is further promoted.

[0005]

[Means to solve the problem]

In order to solve the above problems, this invention has a fuel vapor inlet and a fuel vapor inlet at a predetermined location of the case. The canister is equipped with a steam outlet and an air inlet, and an activated carbon layer is formed inside the case. In the case, the activated carbon layer is connected to the fuel vapor inlet, the fuel vapor outlet, and the fuel vapor outlet. Activated carbon containing pulverized activated carbon is placed in the area facing the air inlet via a binder. A structure is adopted in which porous partition walls are formed by hardening into a sheet shape.

[0006]

[Effect]

The partition walls are hardened into sheets containing pulverized activated carbon, so there are no ventilation holes. is finer than the particles of micronized activated carbon. Therefore, even if the activated carbon is pulverized inside the canister case, it will not pass through the partition wall. It never goes out of the case.

[0007]

【Example】

Hereinafter, one embodiment of a canister according to the present invention will be described based on FIGS. 1 and 2. As shown in FIG. 1, the canister 1 includes a case body 2, a lower closing member 3 that closes a lower end opening ₂₀ of the case body 2, and an activated carbon layer 15 filled in the case body 2. We are prepared.

[0008] As shown in FIG. 2, the upper part of the case body 2 has a fuel vapor inlet pipe 2 _IN which is connected in communication with a fuel tank (not shown) and a vaporizer (not shown). An outlet pipe 2 _OUT is provided. The inlet pipe 2 _IN communicates with the internal space S ₁ of the cylindrical central partition 2 a protruding inside the case body 2, and the outlet pipe 2 _OUT communicates with the external space S ₂ of the central partition 2 a. .

[0009] On the other hand, the lower closing member 3 has an atmosphere inlet 3 whose lower end is open to the atmosphere.₀established A lower lattice plate 4 having a large number of ventilation holes is fixed to the upper end of the lower closing member 3. A disk-shaped lower partition wall 5 is attached thereon. The lower partition wall 5 is an atmospheric conductor. Entrance 3₀and the inside of the case body 2. Further, a ring-shaped upper lattice plate 6 is fixed to the upper part of the case body 2. An upper partition wall 7 having a similar contour shape is fixed to. The lower partition wall 5 is connected to the outlet pipe 2 _OUT and the inside of the case body 2.

[0010]The lattice plate 6 and the upper partition wall 7 are supported by a presser plate 9 fixed to the central partition 2a. An internal lattice plate 10 is fixed to the open end of the central partition 2a, and an internal partition wall 11 is fixed thereon. The internal partition wall 11 is provided to isolate the inlet pipe 2 _IN from the inside of the case body 2.

[0011] It is defined by the inner circumferential wall of the case body 2, the upper and lower partition walls 7 and 5, and the internal partition wall 11. An activated carbon layer 15 is formed in the space. This activated carbon layer 15 is formed by components with high adsorption ability and components with high desorption ability. At least two types of ingredients including granulated activated carbon and vegetable activated carbon with high adsorption capacity. It is formed by Granulated activated carbon is, for example, pulverized coconut carbon with high adsorption capacity. Glass activated carbon is mixed with mineral alumina, which has high desorption ability, and heated and kneaded. It is obtained by cutting the material into pieces while extruding it from a nozzle. Plant-based activated carbon For example, coconut shell, wood chips, palm rock, etc. can be used.

0012 The activated carbon layer 15 is made by mixing such granulated activated carbon and vegetable activated carbon or by mixing them individually. It is formed by laminating layers. In addition to the structure described above, the activated carbon layer 15 may also be made of a plant-based material with high adsorption capacity. Activated carbon and mineral activated carbon with high desorption ability are mixed or stacked individually in layers. It may be configured in such a way that

The upper and lower partition walls 7 and 5 and the internal partition wall 11 are made of activated carbon containing pulverized activated carbon that is hardened into a sheet shape through a binder, and are porous and have air permeability. Specifically, pulverized coal is mixed at a ratio of 2% with a particle size of 8 mesh or less, 93% with a particle size of 8 to 28 mesh, and 5% with a particle size of 28 mesh or more, and PVA resin is used as a binder in the air. It is molded to a thickness of 3 mm under a pressure of 1 kg/cm ² .

[0014] Fine-grained pulverized coal, which is the material for partition walls 5, 7, and 11, is stored in a canister. This is to the extent that it occurs due to miniaturization due to vibrations, etc. For this reason, the partition walls 5, 7, 1 The No. 1 hole does not allow fine activated carbon powder to pass through. The type of activated carbon used for the partition walls 5, 7, and 11 is one that is suitable for adsorption and desorption of the fuel vapor. The same type of carbon as used may be used, such as vegetable-based activated carbon, coal-based activated carbon, mineral-based activated carbon, etc. You can use any material as the main raw material or mix it in the desired proportion. I can do it.

[0015] Note that a partition wall similar to the lower partition wall 5 is placed between the activated carbon layer 15, that is, the upper and lower partition walls. It may be provided at an intermediate position between 7 and 5. Furthermore, the various grids 4, 6, and 10 may be omitted and the partition wall may be provided alone. good. Next, the operation of the canister will be explained.

The canister 1 is used by connecting the fuel vapor inlet pipe 2 _IN to the upper part of the fuel tank, connecting the outlet pipe 2 _OUT to the vaporizer, and opening the atmosphere inlet 3 ₀ to the atmosphere. When the engine is stopped, fuel vapor enters the case from the inlet pipe 2IN through the internal space _S1 through the internal partition wall 11, and is adsorbed and captured by the activated carbon layer 15.

On the other hand, when the engine is operating, air is introduced from the atmospheric air inlet ₃₀ due to the negative pressure of the engine, and fuel vapor is desorbed from the activated carbon at the bottom of the case, and the air rises with the desorbed fuel vapor. , passes through the upper partition wall 7, enters the outer space _S2 , and exits from the canister through the outlet pipe _2OUT . It is then inhaled into a vaporizer. Vibrations are applied to the canister due to vehicle operation, etc., which causes the activated carbon in the activated carbon layer 15 inside to become pulverized. However, the fine powder is blocked by the upper and lower partition walls 7 and 5 and the internal partition wall 11, and does not flow out of the case from the fuel vapor inlet pipe 2 _IN , the outlet pipe 2 _OUT , and the atmosphere inlet 3 ₀ . Furthermore, since the outflow of fine powder is prevented, the capacity of the activated carbon is not reduced, and crushing of the activated carbon due to rolling or the like can be avoided.

[0018]

[Effect of the idea]

The canister according to the present invention has the above-described configuration, so it can withstand vehicle vibrations, etc. Even if the activated carbon inside the canister becomes pulverized, this will prevent it from flowing out of the case. It can be prevented. Therefore, it prevents the activated carbon from deteriorating and can be used as a canister for suction. This has the effect that the attachment/detachment function can be properly maintained over a long period of time.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of an embodiment of a canister according to the present invention.

FIG. 2 is a plan view of the canister of FIG. 1;

[Explanation of symbols]

1 Canister 2 Case body 2 _IN fuel vapor inlet pipe 2 _OUT outlet pipe 3 ₀ Atmospheric inlet 5 Lower partition wall 7 Upper partition wall 11 Internal partition wall 15 Activated carbon layer

Claims (1)

[Scope of utility model registration request] 1. A canister in which a fuel vapor inlet, a fuel vapor outlet, and an atmosphere inlet are arranged at predetermined locations in a case, and an activated carbon layer is formed inside the case, wherein the activated carbon layer is located within the case and the fuel vapor inlet, A canister characterized in that a porous partition wall made of activated carbon containing pulverized activated carbon solidified into a sheet shape via a binder is provided at a location facing a fuel vapor outlet and an air inlet.