JP2508623Y2 - Canister mounting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a mounting device for a canister that adsorbs fuel vapor evaporated from a fuel tank of an internal combustion engine.

[Conventional technology]

It is well known that a canister filled with an adsorbent is used in order to prevent the fuel evaporated from a fuel tank of an internal combustion engine from being discharged into the atmosphere.

A conventional fuel vapor recovery means using a canister will be described below with reference to FIG. In the figure, the canister 1 and the fuel tank 2 are in communication with each other by a steam passage 6 having a relief valve 4 interposed therebetween. The relief valve 4 is opened when the pressure in the fuel tank 2 becomes a certain value or more due to the evaporation of fuel, and the fuel vapor is discharged to the canister 1 side.

In the canister 1, a vapor passage 6 and a vapor outlet 13 of a purge valve 12 leading to an adsorbed fuel purge passage 10 are opened on one side of an adsorbent filling layer 8, and an atmosphere opening 11 is opened on the opposite side. ing. The purge valve 12 is provided with a pipe 19 between the negative pressure chamber 14 and an upstream side of a throttle valve 18 provided in the intake pipe 16, and is configured to open when the intake negative pressure increases. Also, the adsorbed fuel purge passage
An orifice (not shown) is provided for the flow valve 10, and when the purge valve 12 is opened, the canister 1 and the intake pipe 16 downstream of the throttle valve 18 are connected to each other. ing. In the figure, 20 is an air filter, and 22 is an intake port of an internal combustion engine (not shown).

Next, the operation of the canister 1 will be described. Fuel tank 2
When the vapor pressure in the interior rises and becomes equal to or higher than the set pressure, the relief bluve 4 is opened, and the fuel vapor is discharged into the canister 1 and adsorbed by the adsorbent filling layer 8 to release the fuel to the atmosphere. To prevent.

Further, during operation of the internal combustion engine, the throttle valve 18 opens, and when the negative pressure in the negative pressure chamber 14 communicating with the intake pipe 16 upstream of the throttle valve 18 becomes a certain value or less, the purge valve
12 opens. Then, when the atmospheric air passes through the adsorbent filling layer 8 and is sucked into the intake pipe 14 from the atmospheric air opening 11, the adsorbed fuel is entrained in the atmospheric air and sucked into the internal combustion engine.
Therefore, the fuel adsorbed in the adsorbent filling layer 8 can be recovered and consumed as fuel without being discharged to the atmosphere.

The means for fixing the canister to the vehicle body is, for example,
As described in Japanese Patent Publication No. 50-90917, it is usually fixed with a band or the like.

[Problems to be solved by the device]

By the way, if the adsorbent in the canister is used for a long period of time, heavy components in fuel such as gasoline are accumulated in the adsorbent layer, reducing the canister's capacity (working capacity) and reducing the evaporative emission value (adsorbed). However, there is a problem that it becomes difficult to keep the emission value below the legally regulated value.

In order to solve this problem, the heavy component of the fuel is evaporated, recovered in the internal combustion engine, and burned to heat the fuel vapor adsorbent with the cooling water of the internal combustion engine to expel the heavy component. This canister is disclosed in Japanese Utility Model Publication No. 1-63765. However, since this known canister penetrates the inside by the cooling water passage, the respective directions of the fuel vapor inlet / outlet and the cooling water inlet / outlet are fixed, and it is necessary to prepare a specialized canister for each specification of the internal combustion engine.
Also, for example, if the cooling water system is damaged, it is necessary to replace the entire canister. Therefore,
There is a problem that maintenance cost increases.

The present invention has been made in view of the above-mentioned problems, and by providing a heating means for heating the adsorbent and expelling the adsorbed fuel separately from the canister, the internal combustion engines of different specifications can be used. It is an object of the present invention to provide a canister mounting device that has versatility and workability / economy for production / maintenance.

[Means for Solving the Problem] The structure of the canister mounting device of the present invention for achieving the above object is such that the heating jacket can be freely attached to and detached from the canister that is filled with the fuel vapor adsorbent and formed into a cylindrical shape. The jacket is formed so that the cylindrical axial direction cross-sectional shape is C-shaped, and the body of the jacket is tightened with a band so as to be in close contact with the canister, and a bracket for fixing the canister to the vehicle body is attached to the band. It is installed.

The heat source of the heating jacket is cooling water circulating in the internal combustion engine, lubricating oil, electric heat, or the like.

〔Example〕

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

Canister mounting device 24 of Embodiment 1 shown in FIG.
Comprises a heating jacket 26, a band 28 and a bracket 30. The heating jacket 26 has a cooling water passage 32 inside.
Is provided, a cut 34 is provided in the vertical direction to form a C-shape having a cylindrical inner surface, and an inlet 36 and an outlet 38 of cooling water are provided. For example, it can be formed by sheet metal working or the like. .

As described above, since the heating jacket 26 is formed in a C shape by providing the cut 34, when the band 28 is tightened, the cut is made.
The gap of 34 is narrowed and can be closely attached to the body of the canister 1. Therefore, the heating jacket 26 can be easily inserted into and pulled out of the canister 1, and the workability of attaching and detaching the heating jacket is improved.

The band 28 for tightening the heating jacket 26 is provided with a clasp 40 that can be tightened and opened as shown in the figure, and the band 28 and the bracket 30 are integrated by, for example, spot welding 41. In addition, the tightening means of the band 28 is
It is not limited to the means shown in FIG. 1, and other means can be used as appropriate. Reference numeral 42 in the drawing denotes a bolt hole for fixing to the vehicle body.

Next, a usage state of the canister 1 will be described with reference to FIG. The canister 1 has the band 28 as described above.
As a result, the heating jacket 26 is brought into close contact with the canister 1 to efficiently heat the adsorbent filling layer 8 from the surroundings. Therefore, the adsorbing force of the adsorbent-filled layer 8 is reduced, and the adsorbed fuel heavy component is easily separated from the adsorbent.

Also, a cylindrical canister 1 and a heating jacket 26
Since the bracket 30 and the bracket 30 can be attached so as to face in arbitrary directions, they can be adapted to vehicles of various specifications. Further, since the heavy component of the fuel in the canister 1 can be heated, it can be prevented from being accumulated in the adsorbent filling layer 8. In addition, in FIG.
Reference numeral 43 denotes a vapor passage for adsorbing fuel vapor or the like that evaporates from a carburetor (not shown) after the engine is stopped.

The canister mounting device 24 according to the second embodiment shown in FIGS. 3 to 4 is, for example, a heating wire 44 coated with heat resistant insulation.
(The diagram is shown conceptually) is placed in a mat 45 formed of glass wool, glass cloth or the like, and a heating jacket 26 lined with an iron plate 46 is used. The power supply connection terminal 43 of the heating wire 44 was connected to a power supply circuit that was supplied with power from a generator and did not consume battery power. Since the heating jacket 26 of the second embodiment uses electric heating, selection of heating conditions is facilitated.

As a modification of the second embodiment, the iron plate 46 can also be used as a band.

The heating jacket 26 of each of the above-described embodiments may have a shape other than that of the embodiment, such as splitting the heating jacket 26 in addition to the C-shape, elongating the jacket, and forming the zigzag shape around the canister 1. Further, in each of the above-mentioned embodiments, the shape of covering the entire cylindrical surface of the canister 1 is used, but it may be formed so as to cover only a part thereof if necessary.
Further, the outside of the heating jacket 26 can be covered with a heat insulating material to prevent heat radiation to the surroundings.

Further, the canister according to the present invention can be used not only for absorbing the fuel vapor described above, but also for adsorbing the fuel vapor discharged during refueling, for example.

[Effect of device]

As described above, in the canister mounting apparatus of the present invention, the means for heating the adsorbent-filled bed of the canister having a cylindrical shape is provided separately from the canister, and the heating means has a C-shaped cylindrical axial cross-section. Since it was designed to be attached to the canister by tightening it with a band, the heating jacket should adhere to the canister when tightened with the band, and the heating jacket should be formed so that it can be easily pulled out from the canister when the band is loosened. The adsorbent packed bed can be efficiently heated to facilitate the removal of heavy fuel components from the adsorbent, and with the band loosened, the heating jacket can be inserted into the canister for easy withdrawal. Workability can be improved.

The canister, the heating jacket, and the bracket can be arbitrarily selected and assembled, so that they can be mounted on any vehicle having different specifications.

Since the canister, heating jacket and bracket can be replaced separately, high economy can be obtained for production and maintenance.

It is easy to change specifications such as switching from heating with cooling water to heating with electric heating.

[Brief description of drawings]

FIG. 1 is a perspective view of a canister mounting device of the present invention according to a first embodiment, FIG. 2 is a cross-sectional view illustrating a usage state of the canister mounting device of FIG. 1, and FIG. FIG. 4 is a perspective view of the canister mounting device, FIG. 4 is a vertical cross-sectional view of FIG. 3, and FIG. 5 is a configuration explanatory view of a vaporized fuel recovery means by a conventional canister. 1 ... canister, 24 ... canister mounting device,
26 …… heating jacket, 28 …… band, 30 …… bracket, 32 …… cooling water passage, 44 …… heating wire, 46 …… iron plate.

Claims (1)

(57) [Scope of utility model registration request] 1. A heating jacket is detachably attached to a canister which is filled with a fuel vapor adsorbent and is formed into a cylindrical shape, and the jacket has a C-shaped cross section in the cylindrical axial direction.
Formed into a shape, tighten the body of the jacket with a band to form a close contact with the canister, and in the band,
Canister mounting device with a bracket for fixing the canister to the vehicle body.