KR870002797Y1 - Pressure sensor for supplying water in cleaning machine - Google Patents

Abstract

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Description

Pressure sensor for water supply control of washing machine

1 is an exploded perspective view of a pressure sensor according to the present invention.

2 is an assembled cross-sectional view of the present invention.

3 is a state of use of the present invention.

4 (a) 4 (b) is a control circuit diagram of a pressure sensor according to the present invention.

* Explanation of symbols for main parts of the drawings

1: washing machine 2: washing tank

3: vertical tube 4: sensor

5: hose 6: lower case

7: room 8: rubber sheet

9: insulation support plate 10: spring

11: connection terminal 12: lower steel plate

13: upper case 14: upper iron plate

15: Connection terminal

The present invention relates to a pressure sensor configured to control a water supply with an air pressure in accordance with a change in water level in a water supply control device of an electric washing machine.

The washing machine has a pulsator type and a stirring type, but the present invention relates to a sensor for automatically adjusting the water supply in the vortex type washing machine, which is a method used in the East region, especially in Korea.

As described above, the washing machine mainly adopting the spiral winding type may be divided into one tank type and two tank type according to the dehydration method. Among them, the two tank type having the washing tank and the dehydrating tank are dehydrated in the dehydration tank after the washing in the washing tank. One tank is fully automatic so that all processes from washing and rinsing to dehydration are automatically performed in the washing tank. However, in the water supply apparatus in the washing tank for washing the laundry, the principle of the same is devised, that is, when the water is filled to a certain level of the washing tank, the water supply is automatically cut off.

In other words, the water treatment device used in the conventional washing machine, when the water fills up to a certain height in the washing tank, the water level control switch and a pressure sensor for detecting the pressure according to the water level operate the opening and closing of the circuit, so that the water level of the washing tank is constant. It is adjustable in height.

However, such a structure is not practical because it is impossible to detect the water level continuously until it is resupplied once it is operated, and the structure for allowing the water level girl switch to be selected as a touch button (electronic) is not practical. In addition, the pressure sensor using the semiconductor element can adjust the water level as described above, but this is also not practical because the component value is too expensive.

The present invention is designed to solve the drawbacks of the water supply control device employed in the conventional washing machine as described above, the connection of the vertical pipe communicating with the washing tank near the washing tank, the end of the vertical pipe It is located in the lower part of the washing tank, the upper part of the vertical pipe is installed in the sensing device for detecting the water level in the washing tank, when the water level is increased along the vertical pipe, the air in the tube is compressed to increase and decrease the amount of charge of the sensation device electronically The configured pressure sensor is to control the water supply.

Hereinafter, the configuration and operation effects of the present invention will be described in detail with reference to the accompanying drawings.

The present invention is installed on the vertical tub (3) integrally or separately with the washing tub (2) of the spiral wound washing machine (1), and installed on the upper part of the vertical tub (3) to detect the water level with an electrical signal to adjust the water supply It consists of a formal pressure sensor (senser, 4).

And (the pneumatic sensor 4 is a lower case 6 and the lower case 6 and the room 7 formed with a hose 5 through which the compressed air passes, so that the compressed air is collected in the room 7). A sensing rubber plate 8 which is in contact with the sensing rubber plate 8 and serves as an insulator (9), which is installed on the upper side of the insulating support plate 9 and is connected to the terminal 11 together with a spring 10; A lower iron plate 12 having a pole such as), an upper iron plate 4 positioned below the upper case 13 while supporting the spring 10, and a connection terminal integrally formed with the upper iron plate 14. It consists of 15 pieces.

In the drawings, reference numeral 16 is a spring receiving port, 17 is a bolt, 18 is a central axis, 19 is a central circle, 20 is a central hole, 21 is a protrusion formed on the lower steel plate 12, and 22 is an air hole formed in the upper case. 23 is a support, 24 is a control circuit section 25, and 26 is an insulating support plate.

In the present invention configured as described above, the pneumatic sensor 4 has an outer shape in which the upper case 13 and the lower case 6 are coupled for the bolt 17, and the upper case 13 and the lower case 6. A soft rubber plate 8 is sandwiched between them to form a chamber 7, and a central circle 19 of the insulating support plate 9 is fitted to the central axis 18 of the rubber plate 8.

In addition, a lower steel plate 12 having a central hole 20 is fitted on the insulating support plate 9, and a spring storage port of a body upper case 13 supported by a protrusion 21 formed on the insulating support plate 9. The spring 10 inserted in the 16 is connected to the upper steel plate 14 and the connecting terminal 11 while acting as a conductive body. Here, the iron plates 12 and 14 serve as capacitors while forming a pole plate, while an air hole 22 is formed in the upper case 13 so that the rubber plate 8 rises as the air pressure in the room 7 increases and decreases. When the air in the room 25 flows in and out, the upper case 13 and the lower case 6 is coupled to the bolt 17, but is sealed by a rubber plate (8), so compressed air leaks from the room (7). Will not be.

Referring to the operation of the present invention pneumatic sensor is configured as follows.

When water begins to fill the washing tub 2 of the washing machine 1, water is introduced into the vertical pipe 3 at the same level as the water level supplied to the washing tub 2, and when the water is filled in the washing tub, As the water level continues to rise, the air in the riser is gradually compressed between the water level and the chamber (7).

That is, the more water there is, the higher the air pressure of the room 7 is, so this air pressure raises the soft rubber plate 8, and the insulating support plate 9 and the lower iron plate 12, which are sequentially connected to the rubber plate 8, are also included. Will rise together.

Meanwhile, the lower iron plate 12 and the upper iron plate 14 serve as a condenser, that is, the capacity of a general condenser is proportional to the width of both plates forming the condenser and inversely proportional to the distance between the two-sided plates, that is, the extreme distance. Therefore, the rise of the lower steel plate 12 relative to the upper steel plate 14 fixed as illustrated in the figure serves to further narrow the distance between the poles.

In more detail, the connection terminals 11 and 15 are connected to the control circuit unit 24 so that the upper and lower iron plates 14 and 12 have positive or negative poles, respectively, and thus the connection terminals 11 and The lower steel plate 12 connected and conducted by the spring 10 has the same pole, and the upper steel plate 14 connected with the other connection terminal 15 has the same pole as the connection terminal 15, thereby condensing. It will play a role.

That is, when the area between the upper plate 14 and the lower plate 12 is s, the distance between the two plates 14 and 12 is d, and the dielectric constant of air is x, the capacitance c between the plates 14 and 12 is c. C = x × Becomes

Therefore, when water is drawn from the lower part of the vertical pipe, the air in the vertical pipe gradually gathers into the room 7 and is compressed. Thus, the compressed air pressure raises the rubber plate 8, so that the upper steel plate 14 and the lower part The distance between the iron plate 12 is to be narrowed. At this time, since the current flows between the sheet metal plates 14 and 12, the capacitance between the sheet metal plates 14 and 12 is changed, and the changed capacitance is connected to points E and D shown in FIG. By detecting a small current in the connection terminals 11 and 15, the opening and closing of the water supply device is operated in a circuit.

4 is a water supply control circuit connected to the connection terminals 11 and 15 of the present invention, which is a conventional design, but briefly describes the configuration of the circuit to explain the operation of the present invention.

The periodic conversion signal part (A) is composed of resistors R ₁ and R ₂ , capacitor C ₂ and IC ₁ , which is a timer IC, and C ₁ , which is a temporary circuit such as an input sensor of the present invention, and the function selection switch part B is a switch SW. _1, SW _2, consists of a water level selection switch and re-supply the switch SW ₄ and SW ₅ of the start switch SW consisting of _3.

In addition, the solenoid driving unit (C) is composed of the solenoid S ₁ and the resistors R ₃ , R ₄ , R ₅ , the transistors TR ₁ and TR ₂ and the rectifier diode D ₁ to open and close the water supply valve, and the resistors R ₆ , R ₇ , An input / output control unit (D) consisting of R ₈ , R ₉ , R ₁₀ and an IC which is a microcomputer that reads and controls the input unit and the output unit, where a, c, d, e, f, and g are the inputs of the microcomputer and d is the output. It is wealth.

In the above circuit operation, the period T is 0.693 (R ₁ + 2R ₂ ) C _{1 at} the output of the timer IC according to the C ₁ value corresponding to the air pressure transmitted to the sensor 4 as in the fourth degree. A periodic wave is generated at the output period and is always transmitted to the input terminal a of IC ₂ .

If you press one of the water level selection switches, the existing period will be memorized in the computer. Then, if you press the start number switch, the output terminal (b) of IC ₂ will be high and TR ₁ , TR ₂ will be ON. The water supply valve opens to start the water supply as it drives S ₁ . The latter period becomes greater than the former period to the case from the IC to the period of the square wave input to a terminal of the IC _{2 2} still detected by comparing the square wave period is input to the cycle with a terminal that has already been set to the IC ₂ when the IC ₂ Terminal b goes LOW and turns off TR ₁ and TR ₂ to stop S ₁ and stop the water supply.

Further, when donor pressing the switch SW ₅ IC ₂ is standing already and regardless from what is compared to the predetermined frequency and the period entered in a terminal of the IC ₂ a b terminal of the IC ₂ to High, so a starting material water, after IC ₂ is an arbitrary resupply switch.

By using the present invention configured as described above, since the water supply amount of the washing machine uniformly prescribed as in the related art can be arbitrarily adjusted, the waste of water can be reduced and washing can be selected according to the amount of washing. .

Claims (1)

(Correction) Lower case 6 consisting of a vertical pipe entry hose 3 and a room 7, a soft rubber plate 8 installed on the upper part of the lower case 6 to transmit air pressure, and a rubber plate. Insulating support plate (9) and the lower iron plate 12 to be connected to (8), the connection terminal 11 having the same pole as the lower iron plate 12 while being supported by the spring 10 on the lower iron plate 12, The connecting terminal 15 having a pole different from the connecting terminal 11 and connected to the insulating support plate 26 and having the same pole as the upper iron plate 14, and the upper iron plate 14. Pressure supply for water supply adjustment of the washing machine, characterized in that the upper case 11 is coupled to the lower case 6 by the bolt 17 and the connection terminals 11 and 15 are connected to the electronic control circuitry 24. sensor.