KR100263559B1 - Water level percepting sensor of a drum washing machine - Google Patents

Abstract

PURPOSE: A water level sensor is provided to improve the productivity and the quality by assembling an air trap with few components. CONSTITUTION: An air trap(23) contains an air pipe(23a) to connect a hose(15) through a clip(26). The air trap(23) is integrally formed under a tub(22) to reach washing water. An opening is formed under the air trap(23) to be sealed with a cap(25) after installing a thermistor(17). The thermistor(17) is installed on the air trap(23) with a packing(24) to detect a temperature of washing water inside the tub(22). The cap(25) pressurizes the lower part of the thermistor(17) to compress the packing(24). The packing(24) contains an opening to contact the upper face of the thermistor(17) with the washing water. The air trip to detect a water level is assembled with few components. Thereby, the productivity is improved by conveniently assembling and the quality is improved by preventing a leakage of water.

Description

Water level sensor of drum washing machine

The present invention relates to a water level sensor of a drum washing machine, and more particularly, to prevent the air trap for detecting the water level of the drum washing machine from being assembled into a plurality of parts, thereby improving productivity due to the convenience of assembly and preventing water leakage. It relates to a water level sensor of the drum washing machine.

Washing machines are generally classified into stirring, vortex, vibrating and drum type according to the water flow. Unlike other methods, the drum type washing machine, which has a rotating shaft horizontally, has a relatively long washing time, while water and detergents are mounted to drop the water to the surface while lifting the laundry inside the drum. It is mainly used for washing large quantities because it consumes little and does not damage laundry.

1 is a perspective view showing a conventional drum washing machine with main parts in detail.

In general, a drum washing machine includes a tub (1), a tub (2), a drum (3), a control unit, a driving unit, a water supply and drainage unit, and a drying unit as main components. The tub 2 is accommodated in the outer tub 1 via the shock absorber and the spring, and the drum 3 having a myriad of fine pores on the surface thereof is rotatably accommodated in the tub 2. The drive part which transmits the rotational force of the motor 4 is connected to the rear end of the drum 3 via the belt 6 and the pulley 5. In the front end direction of the drum 3, a door 12 for entering and exiting laundry is provided.

According to this configuration, when the user inputs the operation using the control panel 11, the water supply / drainage part consisting of a pump and a valve supplies washing water to the drum 3, and the driving part rotates the drum 3 forward and backward. The washing is completed, and after a predetermined time has elapsed, the contaminated water is discharged from the water supply and drainage unit, dewatered from the driving unit again, and hot air is introduced from the drying unit to dry the laundry.

At this time, the air trap 13 is mounted on the lower end of the tub 2 via the packing 14, and the air trap 13 is connected to the pressure switch 16 and the hose 15. When the pressure switch 16 generates a signal according to the pressure, the control panel 11 may detect the water level and proceed with washing. In addition, the thermistor 17 for detecting the temperature of the wash water is mounted in the vicinity of the air trap 13 via the packing 18.

However, since the air trap 13 is composed of two parts, as shown by reference numerals 13a and 13b, and must be assembled separately and separate the thermistor 17, the labor cost is relatively high, and there is a concern that it may cause a poor quality due to leakage during use of the washing machine. Is high.

Therefore, the technical problem to be solved by the present invention, that is, the object of the present invention, refrain from assembling the air trap for the water level of the drum washing machine with a plurality of parts to improve the productivity and the leakage quality of the convenience according to the convenience of assembly It is to provide a water level sensor mechanism of the drum washing machine.

1 is a perspective view showing a conventional drum washing machine with main parts in detail,

Figure 2 is a perspective view showing the configuration of the main part of the mechanism according to the present invention,

3 is a configuration diagram showing an assembled state of the mechanism according to the present invention.

Explanation of symbols on the main parts of the drawings

1: external 2, 22: tub

3: drum 4: motor

5: pulley 6: belt

11: control panel 12: door

13, 23: Air trap 14, 18, 24: Packing

15: hose 16: pressure switch

17: Thermistor 25: Cap

26: Clip

In order to achieve this object, the water level sensor of the drum washing machine of the present invention is integrally formed at the bottom of the tub so that the wash water reaches, the air trap having an air pipe for connecting a hose using a clip; And a thermistor mounted on the air trap via a packing to detect the wash water temperature in the tub.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

2 is a perspective view showing the configuration of the main part of the mechanism according to the present invention, in which the main components such as the outer tub 1, the drum 3, the control unit, the driving unit, the water supply and drainage unit, and the drying unit as described in FIG. And it can be limited to the change of the tub (2). Therefore, the main operation also maintains the same as before.

According to the present invention, the air trap 23 having the air pipe 23a for connecting the hose 15 using the clip 26 is integrally formed at the bottom of the tub 22 so that the wash water reaches.

In order for the air trap 23 to be integrally molded with the tub 22, the tub 22 should have an injection molded structure using hard synthetic resin. Tub 22, which is subjected to a large impact load during washing, is ejected together with a frame of metal when strength is required to be reinforced, and is connected to and supported by the outer tub 1 at the frame portion. In consideration of manufacturability of the mold for injection molding or workability of molding, the air trap 23 can be formed at a suitable place at the lower portion of the tub 22. That is, in FIG. 2, the air trap 23 is formed on one side of the tub 22, but may be formed on the cylindrical surface of the tub 22. And the tub 22 is preferably to minimize the unnecessary curved surface and to simplify the shape as much as possible.

The air pipe 23a formed on the upper portion of the air trap 23 may have the same shape and function as the conventional one, but the direction of the air pipe 23a can be appropriately changed in consideration of the convenience of injection molding. Even if the direction of the air pipe (23a) is changed, the hose 15 is mounted on the pressure switch 16 as in the prior art, there is no problem.

Figure 3 is a block diagram showing the assembly state of the mechanism according to the present invention, the lower portion of the air trap 23, the thermistor 17 is mounted, the opening is sealed with a cap 25 is formed. The lower end opening of the air trap 23 may also be changed in view of the convenience of injection molding, but the thermistor 17 described later does not become too high than the lower end of the tub 22. The cap 25 is mounted using a separate bolt, directly indented without using a bolt, or by forming a thread on its outer circumferential surface.

2 and 3, according to the present invention, the thermistor 17 is mounted on the air trap 23 via the packing 24 to detect the wash water temperature in the tub 22.

Since the thermistor 17 is mounted on the air trap 23 which is formed by injection without being separated, a separate processing step for mounting the tub 22 as in the conventional art is omitted. The terminal of the thermistor 17 should be exposed to the lower end of the cap 25, but since the packing 24 is interposed on the outer circumferential surface of the thermistor 17, it does not require very high watertightness at the terminal portion. The cap 25 properly presses the lower end of the thermistor 17 so that the packing 24 is compressed. The packing 24 has an opening such that the upper surface of the thermistor 17 is in contact with the wash water. Since the packing 24 may use the same material as the conventional one, it is possible to use only one, so that the manufacturing cost as well as the labor of assembly may be reduced.

According to such a configuration, when the wash water reaches the tub 22 through the through hole indicated by reference numeral 22a, the water level is detected as the air pressure in the hose 15 is changed, and the function of detecting the temperature of the wash water is changed. This is done.

According to the above configuration and operation, the water level detector of the drum washing machine according to the present invention avoids the air trap for detecting the water level of the drum washing machine being assembled into a plurality of parts, thereby improving the productivity according to the convenience of assembly and the quality of the leak prevention. It is effective to plan.

The present invention is not limited to the above-described specific preferred embodiments, and various modifications can be made by any person having ordinary skill in the art without departing from the gist of the present invention claimed in the claims. Of course, such changes will fall within the scope of the claims.

Claims (2)

An air trap integrally formed at the bottom of the tub to reach the wash water and having an air pipe for connecting a hose using a clip; And And a thermistor mounted on the air trap via a packing to detect the washing water temperature in the tub. The water level sensor of the drum washing machine according to claim 1, wherein the lower part of the air trap has an opening which is sealed with a cap after mounting a thermistor.