JPH0320541Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to an improvement of a water draining device for separating water from fuel and draining water accumulated in a container in a fuel filter for a diesel engine.

(Prior Art) The fuel filter currently widely used in diesel engines is shown in Figure 3.
A porous annular end plate 2 is disposed at the center inside the cup-shaped container 1, and a perforated element 3 is formed on the inner peripheral edge of the end plate 2 by folding paper in half and rolling it around a center pipe 3a. The lower end of the center pipe 3a is engaged, and the open end of the container 1 is provided with a sheet plate 4 having a take-out pipe 4a that fits into the center pipe 3a and a number of through holes 4b,
On the other hand, the engaging head 5b of a metal mounting boss 5 having a large diameter screw hole 5a is fitted into the mounting opening 1a at the center of the bottom wall of the container 1, and the top surface of the boss 5 is butted against the bottom surface of the bottom wall. , the abutting portions are brazed, and a water level detection sensor s consisting of a reed switch and a float is installed at the upper end of the screw hole 5a of the metal fitting boss 5, and a water drain hole 6a and an air displacement hole are provided inside. Synthetic resin sensor support 6 provided with 6b
In addition, the sensor support 6 has a plug with a center hole 7a made of synthetic resin, which is used to appropriately seal and open the water drain hole 6a and air displacement hole 6b in the support using a sealing member. The body 7 is eccentrically connected to the opposite side from the sensor s and screwed together from below.

When in use, fuel enters the container 1 through the through hole 4b of the seat plate 4 by the operation of the pump, passes through the filter element 3, is purified, and flows out to the bottom of the porous end plate 2, where it is reversed and the fuel flows into the center pipe. It passes through 3a and flows to the engine side,
During this time, the water contained in the fuel is separated from the fuel due to the difference in specific gravity and accumulates at the bottom of the container. When a certain amount of water accumulates, it is detected by the water level detection sensor s, and the stopper 7
By unscrewing the container 1, the water in the container 1 is discharged to the outside through the drain hole 6a and the center hole 7a.

(Problems to be Solved by the Invention) By the way, in the conventional fuel filter water draining device described above, the metal boss is brazed to the lower surface of the bottom of the container, so the upper surface of the boss has an engaging head for positioning with respect to the container. The head of the head will protrude slightly to the bottom of the container, so when draining water, the water around the head will not drain out and remain, causing corrosion. Since the entire cutout is provided in parallel with the sensor, the diameters of the support mounting portion and the metal boss become large, which has the drawback of increasing weight accordingly.

Therefore, this idea allows for sufficient water removal during drainage,
To provide a water draining device which is useful for corrosion prevention and whose boss can be made smaller and lighter in weight.

(Means for Solving the Problems) Based on the above-mentioned objectives, this invention was developed as a water draining device for a fuel filter. A plurality of upright pieces are provided in the mounting boss, and the upright pieces are inserted into vertical holes of a mounting boss that has a screw hole in the center and a plurality of radial passages leading from the outer peripheral surface to the screw holes at the lower end, and the boss is attached to the bottom wall. On the mounting boss, there is a sensor support consisting of a screw head with a water level detection sensor erected on the large diameter part and the top surface, and an annular groove communicating with the radiation passage at the base, and an eccentric part on the lower side. It is installed through the screw head, and a stepped recess that communicates with the annular groove is provided on the inside from the eccentric part to the large diameter part,
A feature is that a plug having a through hole is screwed into the recess, and the drainage passage is opened and closed by screwing the plug and unscrewing it.

(Function) When the pump operates, fuel enters the container from the upper periphery, passes through the filter element, is purified, comes out to the bottom, reverses, and flows out to the engine side.
During this time, the water contained in the fuel accumulates at the bottom of the container due to the difference in specific gravity, and when it reaches a certain amount, it is detected and notified by the water level detection sensor, and a plug screwed into the bottom of the sensor support is alerted. When the body is unscrewed, the water that has accumulated in the container passes through the radial passage in the mounting boss and the annular groove in the support and is drained to the outside through the opening in the stopper.

(Embodiment) FIGS. 1 and 2 show an embodiment of this invention, in which a porous annular end plate 12 is disposed at the center inside the cup-shaped container 11, and the inner peripheral edge of this end plate 12 is The lower end of the center pipe 13a of the over-element 13 formed by folding a paper in half and rolling it around the center pipe 13a is engaged with the
The structure is the same as the conventional one in that the open end of the container 11 is provided with a sheet plate 14 having a takeout pipe 14a that fits into the center pipe 13a and a large number of through holes 14b.

By the way, in this invention, as shown in FIG. 2, a plurality of narrow upright pieces 11b are provided along the periphery of the mounting opening 11a at the center of the bottom wall of the container 11, and on the other hand, a plurality of narrow upright pieces 11b are provided with a screw hole 15a. The mounting boss 15 is made of synthetic resin or metal, and the same number of vertical holes 15b into which the upright pieces 11b on the bottom wall of the container are inserted are provided in the thick central part surrounding the central screw hole 15a. At its lower end, a plurality of radial passages 15c leading from the outer circumferential surface to the central screw hole 15a are formed between the respective vertical holes 15b, and an upright piece 11b on the container side is inserted into each vertical hole 15b. , their protruding ends are bent outward and the mounting boss 15 is caulked onto the bottom wall mounting opening 11a of the container.

Reference numeral 16 denotes a sensor support made of synthetic resin, and the center portion of the large diameter portion 16a at the center in the height direction is provided with a male screw head 16b that screws into the screw hole 15a of the mounting boss 15. An annular groove 16d is formed at the base of the male screw head 1.
6b into the screw hole 15a of the boss,
The upper surface of the large diameter portion 16a is in close contact with the lower surface of the bottom wall of the container via a sealing material, while the annular groove 16d communicates with the radiation passage 15c of the mounting boss 15.

A water level detection sensor s of a required height consisting of a reed switch and a float is erected on the male screw head 16b, and an eccentric portion 16c is provided below the large diameter portion 16a. A stepped recess 16e of the stopper is bored in the inside from the lower surface to the large diameter portion 16a, and the top end of the recess 16e communicates with the annular groove 16d through a through hole 16f. Furthermore, an air exchange hole 16g is communicated with the lower concave portion, the upper end of which opens to the upper end of the male screw head 16a, and the lower end of which opens to the eccentric portion 16c.
It is open on the side.

A stopper 17 also made of synthetic resin is screwed into the stepped recess 16e.
7 consists of an upper semi-small diameter part with a seal ring 18a attached to the upper part, a lower screw-in large diameter part with a seal ring 18b attached to the upper part, and a knob part at the lower end, and in the center there is a recess 16e with a stepped upper end. A hook-shaped through hole 17a that opens in the middle recess is provided, and when screwed in deeply as shown in the figure, a seal ring 18a in the small diameter portion blocks communication between the upper through hole 16f and the hook-shaped through hole 17a. Also, the large diameter seal ring 18b closes part of the air exchange hole 16g.

When using it, the fuel is pumped through the through hole 14b of the seat plate 14 into the container 11 by the operation of the pump.
The water flows into the fuel, passes through the filter element 13, is purified, flows out to the bottom of the porous end plate 12, reverses itself, rises in the center pipe 13a, and flows toward the engine, during which the water contained in the fuel is removed. The water accumulates at the bottom of the container due to the difference in specific gravity, and when it reaches a certain amount, the float rises, the water level detection sensor s is activated, and the driver is notified.

Therefore, when the plug body 17 is screwed back, the small diameter seal ring 18a enters the wider middle recess from the upper recess of the insertion recess 16e.
Therefore, the water in the container 11 passes through the radial passage 15c at the lower end of the mounting boss and the annular groove 16d of the sensor support, and flows from the upper passage hole 16f. It enters the stepped recess 16e and the hook-shaped through hole 17a of the plug body 17.
It will be discharged to the outside through. At that time, the seal ring 18b of the screwed large diameter part also descends to open the air displacement hole 16g, so this displacement hole 1
External air enters the container 11 through 6g, preventing the interior of the container 11 from being evacuated.

Further, the water in the container 11 contacts the bottom wall, but is discharged through the radial passage 15c at the lower end of the boss, so that it is completely discharged and does not remain at the bottom.

(Effects of the invention) As described above, in this invention, a mounting boss with a radiation passage at the lower end is caulked onto the bottom wall of the container, and the radiation passage is communicated with the annular groove at the base of the screw head of the sensor support. Since the water accumulated in the container is drained through the radial passage and the annular groove, the water can be completely drained without remaining at the bottom of the container, unlike in the conventional case.
Corrosion of the container can be prevented, and the water level detection sensor can be installed upright on the screw head, which is the attachment part of the sensor support, without the need to attach a stopper.
Since the plug body is attached below the screw head, the diameter of the screw head and mounting boss can be made smaller than conventional ones.Moreover, the boss does not need to be brazed, so it can be made of synthetic resin. It can be produced lightweight and inexpensively.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an embodiment of this invention. FIG. 2 is a perspective view of the mounting boss and the bottom of the container. FIG. 3 is a sectional view of a conventional device. In the figure, 11... Container, 11a... Mounting port, 11
b... Standing piece, 13... Over element, 15...
...Mounting boss, 15a...Screw hole, 15c...Radiation passage, 16...Sensor support, 16a...Large diameter part, 16b...Screw head, 16c...Eccentric part, 1
6d...Annular groove, 16e...Stepped recess, 17
... Plug body, 17a ... Hook-shaped through hole, s ... Water level detection sensor.

Claims (1)

[Scope of utility model registration request] A plurality of upright pieces are provided around the mounting opening on the bottom wall of the bottom wall of the cup-shaped container with the over-element arranged in the upper half, and the upright pieces have a screw hole in the center and the lower end is connected to the screw hole from the outer peripheral surface. The boss is inserted into the vertical hole of the mounting boss, which has multiple radiation passages that communicate with each other, and the boss is caulked onto the bottom wall.A water level detection sensor is installed upright on the large diameter part and the top of the mounting boss, and the radiation passages are inserted into the base of the mounting boss. A sensor support consisting of a screw head with an annular groove communicating with the passage and a lower eccentric part is attached via the screw head, and a stepped recess communicating with the annular groove is provided on the inside from the eccentric part to the large diameter part. A draining device for a fuel filter, in which a plug having a through hole is screwed into the recess, and the plug is screwed in and unscrewed to open and close a drain passage.