JP3759228B2 - Gaseous fuel filter - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an engine using gaseous fuel, and more particularly to a filter installed in a fuel supply system of an automobile engine.
[0002]
[Prior art]
The fuel supply system of an engine using gaseous fuel such as LPG and CNG is a fuel conduit having a filter 33 and a solenoid valve 34, which is a high-pressure gaseous fuel filled in a cylinder 31 as schematically shown in FIG. It is introduced into the regulator 35 through 32, where it is reduced to a predetermined pressure and sent from the fuel passage 36 to the mixer 37 installed in the intake pipe 38. The mixer 37 sends gaseous fuel corresponding to the air flow rate that has passed through the air cleaner 39 to the intake pipe 38 and supplies it to the engine 40.
[0003]
The cylinder 31 is made of thick-walled iron so as to withstand high pressure, and its inner surface is easily rusted by moisture contained in the gaseous fuel that is filled.
[0004]
If this iron rust is peeled off and mixed into the gaseous fuel, the fine material is not captured by the filter element of the filter 33 and is sent to the engine 40, which may damage the piston ring and the like. It is necessary to completely remove rust.
[0005]
For this purpose, the filter 33 has a cup-like casing 44 attached to a main body 41 having an inlet passage 42 and an outlet passage 43 for gaseous fuel as shown in FIG. 3, and a filter element 45 and a permanent magnet 46 are concentrically attached to the casing 44. The gaseous fuel that has been housed in the inlet passage 42 passes through the filter element 45 from the outer peripheral surface, and then passes through the magnetic field of the permanent magnet 46 inside thereof to be sent out from the outlet passage 43.
[0006]
[Problems to be solved by the invention]
Permanent magnets 46 are arranged on the central axis alternately with collars 47 made of non-magnetic material as spacers so that a magnetic field is regularly formed almost entirely inside the filter element 45 and gas fuel passes through without leakage. The support rod 48 is fitted.
[0007]
The collar 47 is used in order not to cause the inconvenience that the permanent magnets 46 are attracted to each other and two or more are converted into one permanent magnet, the magnetic field is biased and irregularly formed, and iron rust cannot be completely removed. A plurality of permanent magnets 46 are fitted and held on the support rod 48 at regular intervals.
[0008]
Therefore, it is necessary to prepare a number of collars 47 that is one less than the number of permanent magnets 46. As the number of permanent magnets 46 used increases, the number of collars 47 increases accordingly, the number of parts increases, and the price, There is an inevitable disadvantage in terms of parts management. Further, since the permanent magnets 46 and the collars 47 are alternately fitted to the support rods 48, there is a problem that the assembling work is troublesome and the whole weight is further increased.
[0009]
The present invention has a gaseous fuel filter in which a plurality of permanent magnets are arranged on the inner central axis of a filter element so that a magnetic field is regularly formed almost entirely and magnetic powder such as fine iron rust is removed. This is to solve the above-mentioned problems, that is, the use of collars has a large number of parts, which is disadvantageous in terms of price and parts management, is troublesome in assembly work, and increases the overall weight. is there.
[0010]
[Means for Solving the Problems]
That is, the present invention eliminates the collar, and a plurality of permanent magnets are fitted to the support rod with the same magnetic poles facing each other, and the receiving body is fixedly attached to the lower end of the support rod and the support rod. base is allowed to settle them as stoppers at both ends of the permanent magnet, intermediate the permanent magnet is assumed to be held in equal intervals by the repulsive force of each other. Thus, by using the repulsive force of the permanent magnet itself instead of the collar, a magnetic field is present in the inner space in the center axis direction almost entirely, and the gas that has entered such an inner space. Fuel almost completely passes through the magnetic field and reaches the through-hole, and fine iron rust is adsorbed in the meantime, and it is advantageous in terms of price and parts management, as well as simplifying assembly work and reducing the overall weight. Is achieved.
[0011]
In addition, when the filter of the present invention is applied to the fuel supply system of an automobile engine, it can be attached to the vehicle body in the same way as a normal filter. However, since the vibration acceleration of the automobile body is small, there is a concern that the permanent magnet will dance and become unstable. It is not, and it keeps constant intervals stably.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
The filter of the present invention is installed alone in the fuel conduit 32 with reference to FIG. 2, or the electromagnetic valve 34 is connected to the main body, or the electromagnetic valve 34 is integrally installed in the main body.
[0013]
In addition, it is effective for removing impurities that the gaseous fuel flows through the filter element from almost the entire outer surface and then flows through the inner magnetic field and then flows out. It is preferable that the inlet port is opened toward the entire outer periphery of the filter element, and the outlet passage is opened at one end portion inside the filter element. This passage configuration is the same as that of the conventional product shown in FIG.
[0014]
Furthermore, the permanent magnets are fitted almost tightly on the support rods and kept at a fixed interval without tilting in a floating state using the repulsive force of each other without being screwed or the like. To prevent.
[0015]
【Example】
FIG. 1 shows an embodiment of the present invention. A block-shaped main body 1 has an inlet passage 2 and an outlet passage 5 in which female pipes 3 and 6 for pipe connection are provided at laterally open ends to the outer peripheral surface. The inlet passage 2 has an inlet 4 formed of an annular groove opened on the lower surface of the main body 1.
[0016]
Further, a plug body 8 is fixed by screwing from below into a central portion surrounded by the introduction port 4 of the main body 1, and a through hole 9 provided with both ends open to the lower outer peripheral surface and the upper surface is provided as an outlet passage. 5 communicates.
[0017]
A cup-shaped casing 11 is airtightly attached to an outer lower surface of the introduction port 4 of the main body 1 by an O-ring 12 and a screw (not shown), and a cylindrical filter element 14 and a round bar-shaped support rod 15 are provided in the casing. 11 concentrically. That is, they are suspended by fixing the upper end to the plug body 8. The filter element 14 has an appropriate gap 16 communicating with the introduction port 4 over the entire circumferential surface between the filter element 14 and an inner space 17 of the filter element 14 in which the support rod 15 is inserted and arranged on the central axis. Is closed by a closing member 18.
[0018]
The gaseous fuel enters the gap 16 from the inlet passage 2 through the inlet 4, spreads and passes through almost the entire filter element 14, removes solid impurities, collects in the internal space 17, and passes through the outlet passage 5 from the through hole 9. Sent out. Thus, by using almost the entire filter element 14, magnetic powder such as iron rust and non-magnetic solid impurities can be efficiently removed, but fine iron rust peeled off from the cylinder is removed. It is hard to be done.
[0019]
A permanent magnet 21 for removing fine iron rust that could not be removed by the filter element 14 has a thick disk shape, and has a mounting hole 22 that fits closely to the support rod 15 at the center. In this example, four were used. These permanent magnets 21 are fitted to the support rod 15 from the lower end, and the vertically adjacent ones are arranged with the same magnetic pole, that is, N poles or S poles facing each other.
[0020]
As a result, the permanent magnets 21 are separated by the repulsive force of each other, but the plug body 8 with the upper end of the support rod 15 fixed and the receiving base 23 attached and fixed to the lower end of the support rod 15 serve as stoppers for the permanent magnets 21 at both ends. Therefore, the two intermediate permanent magnets 21 are held at positions where the repulsive forces are balanced, that is, at substantially equal intervals.
[0021]
The permanent magnets 21 arranged at a constant distance from each other form a magnetic field, and therefore, the magnetic field is present in the inner space 17 in a properly regulated manner in the central axis direction. The gaseous fuel that has entered passes through the magnetic field almost completely and reaches the through-hole 9, during which fine particulate iron rust is also adsorbed by the permanent magnet 21.
[0022]
Of course, the plug body 8, the support rod 15, and the cradle 23 are made of a nonmagnetic material. Further, the permanent magnet 21 is held in close contact with the support rod 15 and is held without tilting, and is automatically held at regular intervals using the repulsive force of each other. The assembling work is simpler than the means for holding. In particular, there is an advantage that the assembly direction can be checked very easily because the magnetic poles are attracted to each other when the magnetic poles are fitted face to face.
[0023]
Furthermore, when installed in a stationary place, of course, the vibration acceleration is small even when it is mounted on an automobile body, so the permanent magnet 21 does not dance against the repulsive force and maintains a constant interval stably. To do.
[0024]
Furthermore, if the cradle 23 is removed, the permanent magnet 21 can be removed from the support rod 15 by dropping the permanent magnet 21 and the maintenance inspection can be easily performed.
[0025]
【The invention's effect】
As described above, according to the present invention in which a plurality of permanent magnets are arranged in a state where a constant interval is maintained by utilizing the repulsive force of each other, the cost can be reduced and the weight can be reduced with a small number of parts, and the assembling work is easy. In addition, it is possible to reliably remove fine iron rust contained in the gaseous fuel by regularly forming a magnetic field almost entirely inside the filter element.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention.
FIG. 2 is a schematic layout diagram of a gaseous fuel supply system of an engine.
FIG. 3 is a longitudinal sectional view of a conventional filter used in the system of FIG.
[Explanation of symbols]
1 body, 2 inlet passage, 4 inlet, 5 outlet passage, 8 plug body, 11 casing, 14 filter element, 15 support rod, 17 internal space, 21 permanent magnet, 23 cradle

Claims (1)

A main body having an inlet passage and an outlet passage for gaseous fuel, a cylindrical filter element, and a plurality of permanent magnets fitted at intervals to a support rod installed on the inner central axis thereof are accommodated. A gas fuel filter in which the main body and the casing are coupled with the inlet passage and the outlet passage communicating with the outer side and the inner side of the filter element, respectively; the plurality of permanent magnets having the same magnetic pole A plug body that is fitted to the support rod facing each other and fixed at the upper end of the support rod and a cradle attached and fixed to the lower end of the support rod fixes these as permanent magnet stoppers at both ends to fix the intermediate permanent magnet. gaseous fuel filter, characterized in that; but are held at equal intervals by the repulsive force of each other.

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