JPS5830125Y2 - Fuel filter water level detection and automatic draining device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a device for detecting and displaying the level of water accumulated in a fuel filter and automatically discharging the water.

Generally, a fuel filter is provided in the fuel system of an internal combustion engine such as an automobile to prevent water, dirt, etc. from entering the engine.

The water removed by this fuel filter gradually accumulates in the filter container, but once the amount reaches a certain level,
Open the drain cock at the bottom of the filter container, etc.
You have to do what is called water drainage.

In this case, the water must be drained while paying attention to the water level inside the filter so that only the water can be discharged without draining the fuel inside the filter.

In this way, in order to notify that water has accumulated in the fuel filter, and to separate only the water in the filter from the fuel and discharge it, a device that detects and displays the water level in the fuel filter is absolutely necessary. be.

Furthermore, if possible, it would be desirable to have a device that, in addition to the above-mentioned display, can separate the water accumulated in the filter from the fuel and automatically discharge it.

Figure 1 & Figure 1 shows a conventional fuel filter water level detection and automatic discharge device configured to meet the above-mentioned demands, in which a pair of rod-shaped electrodes 2a and 2b are vertically inserted into a fuel filter 1. Three amplifiers detect and amplify the resistance change between the two, and the amplified output of the amplifier 3 drives a relay 4, and the contact X1, which opens and closes according to the operation of the relay 4, connects the pylon lamp L1
It is configured to drive the lighting.

Further, at the bottom of the container of the fuel filter 1, an electromagnetic cock 5a is provided for discharging water accumulated inside the filter 1.
A drive coil 5b for opening the electromagnetic cock 5a is connected in parallel with the pylon lamp L1.

As a result, the water level in the fuel filter is displayed by the lighting state of the pilot lamp L1, and
In parallel with the lighting of the lamp L1, a drive current is supplied to the drive coil 5b to open the electromagnetic condenser 5a, whereby the water inside the filter 1 is automatically discharged from the condenser 5a, separated from the fuel. It is now possible to do so.

When the water is completely discharged, the lamp L1 goes out and the electromagnetic cock 5a closes to close the bottom of the fuel filter 1 container again.

However, as is clear from the illustrated example, this type of water level detection and automatic discharge device is
In order to detect the resistance change between the fuel filter 1 and the power source (battery ) 7 and there was the trouble of making complicated circuit connections.

This idea was devised in view of the above circumstances, and its purpose is to eliminate the need for amplifiers, relays, etc., which have traditionally made odor detection devices complicated and expensive, and which have had troublesome installation and wiring. An object of the present invention is to provide a water level detection and automatic discharge device for a fuel filter that can be configured more easily, more compactly, and at a lower cost by simply using a thyristor and a few passive elements. .

Hereinafter, embodiments of this invention will be described in detail based on the drawings.

FIG. 2 shows an embodiment of the fuel filter water level detection device according to this invention. First, this device consists of a pair of electrodes 9 a and 9 inserted vertically into the fuel filter 8.
This filter is similar to the conventional one described above in that the level of the water accumulated in the filter 8 is detected by detecting the change in the resistance (RX) between b and b.

However, this device does not use elements that would complicate the device, such as amplifiers or relays.

Instead, a thyristor (hereinafter abbreviated as SCR) is used.

)10 and resistor R1 are only used.

In other words, the voltage dividing circuit 11 uses the resistor R1 and incorporates the resistor RX that apparently collects dust between the electrodes 9a and 9b.
form.

The above 5CRIO is provided so as to be ignited and driven by this divided voltage output Ev.

Furthermore, a Byron lamp L2 is inserted in series between this 5CR10 and the power source (pantry) 12.

In this case, the pilot lamp L2 is a so-called flicker type lamp which is lit intermittently by a bimetal 16 enclosed within the lamp.

The 5CRIO and the resistor R1 are integrally molded and incorporated into the casing head 14 of the fuel filter 8 in a connected state.

On the other hand, an electromagnetic cock 13a is provided at the bottom of the container of the fuel filter 8 for draining water accumulated inside the filter 8.

A drive coil 13b for operating the electromagnetic cock 13a in an open state is connected in series between the 5CRIO and the pilot lamp L2.

Here, to be more specific, as shown in FIG.
and the other end is connected to the casing head 14.
It is connected to an external connection terminal PIK provided at the terminal P1, and is connected in series to the pilot lamp L2 and the power source 12 via this terminal P1.

In this way, both ends of the drive coil 13b are connected to the fuel filter 8 side where the drive coil 13b is attached together with the electromagnetic connector 13a, so that the fuel filter 8 can be connected to one terminal (or wire). Only one point (terminal) Pl is derived.

This terminal P1 is for connecting to the floating side of the power supply 12, and other common ground lines are commonly connected via the metal attachment portion 15 of the filter 8, etc.

As shown in the figure, a pilot lamp L2 and a power source 12 are each directly connected to the terminal P1.

As described above, in the embodiment, the resistor R1 for configuring the voltage dividing circuit 11 and the 5CR10 are integrated into the casing of the fuel filter 8 by molding,
In addition, since both ends of the drive coil 13b are connected on the filter 8 side, the configuration can be configured with an extremely simple installation process of simply connecting the pilot lamp L2 and power source 12 to the terminal P1. It looks like this.

Now, FIG. 3 shows the above-mentioned device with an electrical circuit diagram. In this case, what should be noted in particular is that generally, 5CRIO, by its nature, once ignited, the gate current Even if the arc disappears, the arc will not be extinguished (returning to the cut-off state before ignition). Therefore, in order to extinguish the arc, the circuit current must be cut off once. Providing an additional circuit in the fuel filter complicates the device, which also makes it difficult to use the SCR in a fuel filter water level detection and automatic drain system.

However, in this invention, the above-mentioned problem is overcome by the above-mentioned structure.

That is, the water level in the fuel filter 8 is above 5CRI.
igniting the O, the 5CR10 is ignited and the pilot lamp L2 lights up, and at the same time, a drive current flows through the drive coil 13b, the electromagnetic cock 13a opens, and the fuel is accumulated inside the fuel filter 8. The water will now drain out the bottom of the filter container.

However, due to the bimetal 16 in the lamp 2, the current in the circuit in series with the lamp L2 and the drive coil 13b is cut off after a certain period of time, and after a certain period of time, the circuit in series with the lamp L2 and the drive coil 13b is cut off. The bimetal 16 returns to conduction again.

At this time, if there is a gate input (Ev) or water level sufficient to fire the 5CRIO, the 5CR10 will be fired again immediately.

In this way, when the water level in the fuel filter 8 is above a certain level, the water level in the fuel filter 8 is lowered to a certain level. The operation is repeated, and during this time the pilot lamp L2 continues to display that the water level in the filter B is above a certain level by blinking.

Further, the electromagnetic contact 13a also has the pilot lamp L.
The opening/closing operation is performed in conjunction with the second dotting operation, and the water accumulated inside the filter 8 is discharged intermittently.

Then, when the water level falls below a certain level, the bimetal 1
Even if 6 returns, the gate input (Ev) of 5CR10 disappears, so the re-ignition is no longer performed, and therefore the pilot lamp L2 stops blinking and remains off.
At the same time, the electromagnetic container 13a also becomes a closed casing.

As a result, water is automatically drained until the water level drops below a certain level, and the status during that time is displayed by the Byron lamp L2.

At this time, if the water level falls below a certain level, the electromagnetic condenser 13a will no longer open, so the bottom of the container of the filter 8 can be closed without even the fuel being discharged.

Fig. 4 is a graph showing the water level and the ignition state of the 5CR10, and the graph line a in the figure indicates the water level h (6 or the resistance Rx between the electrodes 9a and 9b) between the casing and the ignition state of the 5CR10. The graph lines in the same figure indicate the state of change in the current flowing through the 5CR10 drive coil 13b and the lamp L2, respectively.

Note that the display using the pilot lamp L2 is also performed using dots, but this kind of display using dots provides a clearer display than continuous lighting, and can call for attention. This has the advantage that.

As described above, the fuel filter water level detection and automatic discharge device according to this invention detects the amount of water accumulated in the fuel filter by detecting the resistance change between a pair of electrodes inserted vertically into the fuel filter. In a device that detects the surface position and automatically discharges the air, a voltage dividing circuit incorporating a resistor appearing between the electrodes is formed, and a thyristor is provided which is driven to fire by the divided voltage output of this voltage dividing circuit. ,
Furthermore, a pilot lamp is inserted in series between the cyrisk and the power supply, and a flickering lamp is used as the pilot lamp, which is lit intermittently by a bimetal sealed inside the lamp. (An electromagnetic condenser is provided to drain water accumulated inside the filter.) A drive coil for operating the electromagnetic cock in the open state is connected in series between the thyristor and the pilot lamp. The device can be constructed extremely simply, compactly, and at low cost by using only thyristors and a few passive elements.

[Brief explanation of the drawing]

Figure 1 is a front view including a partial circuit diagram showing an example of a conventional fuel filter water level detection and automatic discharge device;
The figure is a front view including a partial circuit diagram to show one embodiment of the fuel filter water level detection device according to this invention, FIG. 3 is a circuit diagram showing the electrical part of the device shown in FIG. 2, and FIG. The figure is a graph chart showing the operation of the apparatus shown in FIGS. 2 and 3. 8...Fuel filter, 9a, 9b...
Electrode included 10...-Thyristor, (SCR), 11
...... Voltage divider circuit, 12... Power supply, 13a
...Electromagnetic cock, 13b...Drive coil, 14...Casing head, 6...Bimetal, h...Water level.

Claims (2)

[Scope of utility model registration request] (1) In a device that detects the level position of water accumulated in the fuel filter by detecting a change in resistance between a pair of electrodes inserted vertically into the fuel filter and automatically discharges the water, A voltage divider circuit incorporating the resistance appearing between the electrodes is provided, a thyristor is provided which is driven by the divided voltage output of the voltage divider circuit, and a pilot lamp is connected in series between the thyristor and the power supply. At the same time, a flashing lamp is used as the pilot lamp, which is lit intermittently by a bimetal sealed inside the lamp, while an electromagnetic lamp is installed at the bottom of the filter to drain water accumulated inside the filter. A fuel filter water level detection and automatic discharge device comprising a cock, and a drive coil for opening the electromagnetic cock connected in series between the thyristor and the pilot lamp. (2) A resistor for forming the voltage dividing circuit and the thyristor are integrated into the casing of the fuel filter, and one end of the drive coil is connected to the thyristor, while the other end is connected to the casing. The water level detection and automatic discharge device for a fuel filter according to claim 1, which is connected in series to the pilot lamp and the power source through a connection terminal provided in the fuel filter.