CN1162661A - Apparatus for preventing water overflow in washing machine - Google Patents

Abstract

The invention aims to provide an anti-overflow device for the washing machine. A photosensitive part and a luminous part are arranged on the corresponding overflow position of a washing bath. The overflow is detected by the difference between the air-transmittance under the before-overflow state and the water-transmittance under the overflow state. The device includes a inducting device, which is arranged at the lower part of the side wall of the washing bath and whose underside is opened for inducting the water flow and whose upside is closed; a pressure device, which inserts the inducting device from the outside of the washing bath and is arranged vertically and upwardly at the height of the washing bath; and a overflow detecting device, which is arranged at the position of the pressure device corresponding to the overflow position of the washing bath.

Description

The anti-overflow device of washing machine

The water level that prevents that the present invention relates to washing machine overflows (OVERFLOW), the water level that prevents that particularly relates to washing machine overflows device, prevent that when the feedwater that is produced by the difference sum of errors timeliness variation of level sensor set (SET), flase drop is surveyed and supplied with the interior water level of sink and overflowing of taking place.

In existing washing machine, in when feedwater, overflow to detect and use level sensor to come the sensed water level frequency, when changing to certain frequency when above, end feedwater, prevent from thus to overflow.

The detection of above-mentioned level sensor action is as follows: after the user drops into washings and washing agent in the sink, press the washing key and set washing procedure, when having set wash time and washing current, microcomputer is opened water-supply valve, in sink, supply with washings and arrive certain water level, when water being injected in the above-mentioned sink, be provided with more than the position of air hose, air in the air hose is compressed, junction pipe along air hose, pressure is imposed on barrier film in the level sensor, because above-mentioned air pressure, membrane becomes expanded and iron core (core) is moved to coil inside.

The movement pressure of above-mentioned iron core affacts on the spring, keeps certain balance by the compression stress of hydraulic pressure and spring, and makes (L) the value variation of inductance (REACTANCE) of coil.

The generation of said frequencies has produced the resonance that the capacitance " C " by the inductance value " L " of coil and capacitor forms.Resonant frequency (F) is provided by following formula: $F=\frac{1}{2\mathrm{\π}\sqrt{L*C}}\left[\mathrm{Hz}\right]$

When iron core is mobile, changes by frequency that coil and capacitor produced inductance (L) value, and make frequency (F) variation because of the insertion depth decision of iron core.

But, this existing frequency change that employed level sensor utilizes coil and relative position difference in change unshakable in one's determination to be produced in water level detecting, the variation of relative position is to be produced by the spring of level sensor inside and hydraulic pressure.

As shown in Figure 1, this moment, the error that deviation produced of employed spring was bigger, will exist and to detect the situation of overflowing to the such error addition that capacitor produced of the such coil sum of errors Fig. 3 of Fig. 2, and, there is following problems: after the process use of certain hour, because the timeliness of spring changes, the startup of sensor changes and can not detect and overflow.

The object of the present invention is to provide a kind of anti-overflow device of washing machine, it or not pressure detecting water level by water level, but on pipe position, photographic department and illuminating part being set corresponding to the spillover position of sink, the difference of the light transmittance of the light transmittance of the air when not overflowing and the water when overflowing detects overflows.

To achieve these goals, technical measures of the present invention comprise:

Priming device is arranged on the lower sidewall of sink, downside by open can guide current, last side closure;

Pressure apparatus inserts priming device from above-mentioned sink is outside, and vertically upward is set on the height of about sink;

Overflow checkout gear, be arranged on the position corresponding to the pressure apparatus of the spillover position of above-mentioned sink, with the light transmittance of the air when anhydrous in the pressure apparatus and the difference of the light transmittance of the water when overflowing detect and overflow.

Fig. 1 is the curve map of the spring error behind the level sensor internal calibration that uses in the water level detecting of existing washing machine;

Fig. 2 is the curve map of the error that coil produced of the level sensor inside of Fig. 1;

Fig. 3 is the curve map of the error that produced of the level sensor interior capacitor of Fig. 1;

Fig. 4 is the concise and to the point pie graph of the anti-overflow device of washing machine of the present invention;

Fig. 5 is the detailed circuit diagram of overflowing test section of Fig. 4;

Fig. 6 be by the light transmittance of the light transmittance of the air of Fig. 5 and water difference produced overflows the test section output voltage waveform.

Embodiment

Fig. 4 is the concise and to the point pie graph of the anti-overflow device of washing machine of the present invention, comprising: sink (100), make the water generates eddy current of being supplied with, and wash by the friction of water and washings; Air chamber (101) is arranged on the lower sidewall of above-mentioned sink (100), and downside is by opening, and upside is closed; The force pipe of transparent material (102) inserts the air chamber (101) from above-mentioned sink (100) is outside, vertically upward is set on the height of about sink (100); Overflow test section (103), be arranged on the position corresponding to the force pipe (102) of the spillover position (104) of above-mentioned sink (100), with in the force pipe (102) when anhydrous the difference of the light transmittance of the light transmittance of air and the water when overflowing detect and overflow.

As shown in Figure 5, the above-mentioned test section (103) that overflows comprising: light-emitting component (103a), be arranged on the side corresponding to the force pipe (102) of the spillover position (104) of above-mentioned sink (100), by light being transmitted on the force pipe (102) by the voltage of failing the people from the resistance (R1) of power supply terminal (Vcc); Photo-sensitive cell (103b), with above-mentioned light-emitting component (103a) relative direction on be arranged on the opposite side of force pipe (102), detect the passing through force pipe (102) of self-emission device (103a) and light that people at random penetrates, and export the corresponding signal of telecommunication; Switch element (Q1) by the signal of telecommunication of defeated people to above-mentioned photo-sensitive cell (103b), is given bypass or lead-out terminal (Vout) the defeated people of voltage amplification who fails the people from power supply terminal (Vcc) through resistance (R2).

The action and effect of the present invention effect of this structure is described below with reference to Fig. 4 to Fig. 6.

At first, after the user drops into washings and washing agent in the sink (100), press the washing key and set washing procedure, when having set wash time and washing current, microcomputer (not shown) is opened water-supply valve and is begun water filling in sink (100).

Then, below middle water level, do not use the following test section (103) that overflows, when being in middle water level when above, the light-emitting component (103a) that overflows test section (103) receives the voltage of being supplied with by power supply terminal (Vcc) by resistance (R1), makes light be transmitted into force pipe (102) side.

Then, by above-mentioned microcomputer water-supply valve is opened, begin to sink (100) water filling, when arriving certain water level, proportional with the pressure in the sink (100), make water pass through air chamber (101) person who lives in exile's force pipe (102), when arrival was overflowed designated water level and is spillover position (104), the output voltage that overflows test section (103) changed.

As shown in Figure 6, the variation of above-mentioned output voltage (Vout) is such: when being sent the light time by light-emitting component (103a), light transmittance by air promptly sees through amount poor of amount and the light that sees through force pipe (102) when water is arranged and water of the light of the force pipe (102) when not having water, and output voltage (Vout) is changed.

Because the material of force pipe (102) is a transparent rubber, can influence seeing through of light hardly, therefore, when water filling, the light that is sent from light-emitting component (103a) is at random because of water, has just reduced the amount of the light of arrival photo-sensitive cell (103b), and then output voltage (Vout) changes.

Promptly, when the amount of the light that arrives photo-sensitive cell (103b) for a long time, make photo-sensitive cell (103b) conducting, and switch element (Q1) is connected, because the voltage of power supply terminal (Vcc) is bypassed to the ground connection side by the switch element (Q1) of resistance (R2) and above-mentioned connection, then as shown in Figure 6, output voltage (Vout) is kept electronegative potential, this electronegative potential is offered microcomputer, microcomputer judges that present water level is normal, then by water-supply valve to sink (100) water filling, make it to arrive designated water level.

Then, when the amount of the light that arrives photo-sensitive cell (103b) after a little while, photo-sensitive cell (103b) is interdicted, switch element (Q1) is turn-offed, as shown in Figure 6, because the voltage of power supply terminal (Vcc) is exported to the output voltage (Vout) of lead-out terminal by resistance (R1), then keeps high potential.

Above-mentioned high potential is provided for microcomputer, and microcomputer judges that present water level is an overflow status, and turn-offs water-supply valve, ends to sink (100) water filling.

As above-mentioned detailed description, according to the present invention, has following effect: corresponding to washing Wash on the pipe position of spillover position of groove photographic department and illuminating part are set, the air when not overflowing The difference of the light transmittance of the water of light transmittance when overflowing detects overflows.

Claims (3)

1. the anti-overflow device of a washing machine is characterized in that, comprising:

Priming device is arranged on the lower sidewall of sink, downside by open can guide current, last side closure;

Pressure apparatus inserts priming device from above-mentioned sink is outside, and vertically upward is set on the height of about sink;

Overflow checkout gear, be arranged on the position corresponding to the pressure apparatus of the spillover position of above-mentioned sink, with the light transmittance of the air when anhydrous in the pressure apparatus and the difference of the light transmittance of the water when overflowing detect and overflow.

2. the anti-overflow device of washing machine according to claim 1 is characterized in that, the above-mentioned checkout gear that overflows comprises:

Light-emitting component is arranged on a side of above-mentioned pressure apparatus and sends light;

Photo-sensitive cell is arranged on the opposite side of pressure apparatus on the direction relative with above-mentioned light-emitting component, detects the light that people at random penetrates, and exports the corresponding signal of telecommunication;

Switch element amplifies and exports to the signal of telecommunication of above-mentioned photo-sensitive cell defeated people.

3. the anti-overflow device of washing machine according to claim 1 is characterized in that, above-mentioned pressure apparatus is formed by the transparent rubber material.

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