KR20070074862A - Drum type washing machine - Google Patents

Abstract

A drum type washing machine is provided to prevent the air in the interior of a drum from being flowed backward into a detergent resolution unit by using a backward flow prevention unit. A drum type washing machine includes a housing, a tub(12), a detergent resolution unit(30), a water supply passage, and a backward flow prevention unit. The tub is installed in the housing. The detergent resolution unit supplies a detergent and washing water to the tub. The water supply passage is connected between the tub and the detergent resolution unit. The backward flow prevention unit is installed in the water supply passage and is normally closed and is opened by the pressure due to flow of the washing water.

Description

Drum washing machine {Drum type washing machine}

1 is a cross-sectional view showing the internal structure of the drum washing machine according to the present invention.

Figure 2 is a perspective view showing a backflow prevention device provided in the drain port of the detergent dissolving apparatus.

3 is a cross-sectional view taken along line III-III in FIG. 2, (a) shows a state in which the flow path is closed by the diaphragm, and (b) shows a state in which the diaphragm is opened due to rotation of the diaphragm by water supplied thereto. will be.

* Description of symbols on the main parts of the drawings *

       10: housing, 12: tub,

       14: water supply pipe, 15: drive motor,

       20: drum, 25: drying apparatus,

       30: detergent dissolving device, 33: drainage port,

       33a: fixing groove, 33b: stopper,

       34: diaphragm, 34a: fixed protrusion,

The present invention relates to a drum washing machine, and more particularly, to a drum washing machine including a backflow preventing device for preventing the air inside the drum from flowing back to the detergent dissolving device.

In general, the drum washing machine is divided into a type having a washing and dehydrating function, and a drum washing machine having a drying function in addition to these functions.

In the case of a drum washing machine having a drying function, it is generally configured to heat the air in the drum by using an electric heat and to generate water vapor continuously through the condenser.

At this time, a water supply flow path is provided between the detergent dissolving device and the tub installed in the housing of the washing machine, and the water supply flow path is provided with a rubber tube in which a U trap is formed.

Accordingly, after the water supply process through the detergent dissolving device is finished, water is accumulated in the U trap, and thus, the water supply passage is closed to prevent the heat in the drum from flowing back to the detergent dissolving device in the subsequent drying process. .

However, the water supply flow path is formed of a soft rubber material and overflowed with water trapped in the U trap due to vibration generated by the drum during the dehydration process, by evaporation or hot water in the drum during the drying process, or by the drum. When the washing machine has not been used for a long time, there is a problem that the water flow path is opened as water does not remain as all the water in the U trap evaporates.

When the water supply passage is opened in this way, as air in the drum is discharged to the outside of the drum, there is a problem that water droplets are formed by moisture around the control panel and the detergent dissolving device.

In order to solve this problem, it is an object of the present invention to provide a drum washing machine having a backflow prevention device for opening and closing the water supply flow path between the detergent dissolving device and the tub to block backflow from the drum.

In order to achieve the above object, the drum washing machine according to the present invention comprises a housing, a tub installed in the housing, a detergent dissolving device for supplying detergent and washing water to the tub, and a connection between the tub and the detergent dissolving device. The water supply passage, which is installed in the water supply passage, characterized in that it comprises a backflow prevention device that is opened by the pressure according to the flow of the wash water and is normally closed.

In addition, the backflow prevention device includes a diaphragm rotatably installed in the water supply passage so as to open and close the water supply passage, and a stopper protruding from the water supply passage so that the diaphragm stops in a state in which the water supply passage is closed. Characterized in that.

In addition, two fixing protrusions forming a rotating shaft of the diaphragm are provided on both sides of the outer circumference of the diaphragm, and a fixing groove into which the fixing protrusion is inserted is provided at the inner circumference of the water supply passage.

In addition, the water supply passage is formed to be inclined downward, the diaphragm is characterized in that the thickness of the upper portion is formed thicker than the lower portion based on the rotation axis to close the water supply passage by its own weight.

In addition, the rotating shaft is characterized in that it is provided eccentrically upward from the diaphragm.

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

As shown in FIG. 1, the drum washing machine according to the present invention has a housing 10 formed in an approximately box shape to form an appearance, and a tub 12 installed horizontally inside the housing 10 to accommodate washing water. ), A drum (20) rotatably installed in the tub (12) and having a plurality of dehydration holes formed on the surface thereof, and a driving motor (15) for driving the drum (20) to transmit power.

The tub 12 and the front part of the drum 20 are formed with an opening 13a to put laundry into the drum or to take out the laundry contained in the drum 20, and the tub 12 is formed on the front of the housing 10. And the door 13 for opening and closing the open front of the drum 20 is hinged.

In addition, the lifter 24 is disposed in the longitudinal direction at a predetermined interval on the inner circumferential surface of the drum 20, and as the drum 20 rotates, the laundry is pulled upward and dropped from a certain height to obtain a washing force by the impact at this time. do.

In addition, the outer surface of the tub 12 is provided with a drying device 25 for blowing a laundry in a high temperature dry state to the laundry contained in the drum 20 during the drying operation to quickly dry the laundry is complete.

The drying device 25 together with the drum 20 forms an air circulation passage which is a closed circuit to continuously circulate the inside and outside of the drum 20, and a blower fan installed in the air duct for forced air blowing. It includes, the discharge port and the suction port of the air duct is provided in the front and rear of the tub 12, respectively.

The air duct is again disposed on the rear of the tub 12 to condense the moisture contained in the hot and humid air passed through the tub 12, and disposed on the upper surface of the tub 12 passes through the condensation duct Blowing duct for sending a dry air to the tub (12).

In addition, the lower portion of the housing 10 is provided with a drain pipe 19 and a drain pump 18 for discharging the washing water in the drum 20 to the outside.

On the other hand, the upper portion of the housing 10 is provided with a water supply hose for receiving the wash water from an external water supply source, and a detergent dissolving device 30 for supplying detergent to the tub 12 by supplying detergent to the supplied wash water, A water supply pipe 14 forming a water supply passage is connected between the detergent dissolving device 30 and the tub 12.

The water supply flow passage is provided with a backflow preventing device which is opened by pressure in accordance with the flow of the washing water and is normally closed.

The backflow prevention device according to the present embodiment is provided in the drain port 33 of the detergent dissolving device 30, in particular on the water supply flow path, specifically, the plate provided in a shape corresponding to the shape of the water supply flow path in the drain port 33 ( 34 is rotatably installed so that the diaphragm 34 rotates to shield the water supply passage.

For rotation of the diaphragm 34, both sides of the outer periphery of the diaphragm 34 are provided with a fixing protrusion 34a which forms a rotation axis of the diaphragm 34, and the fixing protrusion 34 is provided in the drain port 33. A fixing groove 33a is inserted to support the diaphragm 34 in a rotational structure.

The drain port 33 is provided at the lower portion of the detergent dissolving device 30 to be inclined downward, and the diaphragm 34 must close the water supply passage in a state in which water is not supplied to prevent backflow. The upper part is heavier than the lower part about the rotation axis formed.

Accordingly, the diaphragm 34 has a thicker upper portion than the lower side with respect to the rotation axis, and the diaphragm 34 stops in the closed state at the inner circumference of the drain port 33. A stopper 33b protruding to support the upper side is provided.

In addition, the diaphragm 34 rotates by the pressure of the water supplied in the water supply state, and the flow path must be opened. When the rotary shaft is formed to pass through the center of the diaphragm 34, the rotation moments received by the upper and lower parts based on the rotation axis are When the thickness of the upper part becomes thicker as mentioned above, especially when the water to be supplied is applied, the moment applied to the upper part is larger, so that the diaphragm does not rotate and may close the flow path as it is.

Therefore, it is preferable that the rotation shaft is provided eccentrically toward the upper side so that the moment received from the upper side is greater than the moment received from the upper side by the water supply so that the diaphragm is opened smoothly by the pressure of the water supplied. The projection 34a is provided to be eccentrically upward from the outer periphery of the diaphragm 34.

Hereinafter will be described the operation and effects of the drum washing machine according to the present invention.

Water is introduced into the detergent dissolving device 30 through the water supply hose in the washing mode or the rinsing mode, and the water passing through the detergent container 32 therein is supplied into the tub 12 through the water supply passage.

In this case, the diaphragm 34 in the backflow prevention device in the water supply passage rotates by the pressure of the water supplied by the drop, and thus the water supply passage is opened.

When the dehydration process is completed, the drying process is performed according to the user's choice. In this case, the diaphragm 34 is rotated by its own weight because the upper part is heavier around the rotating shaft, and the upper part contacts the stopper 33b. Close the flow path.

Therefore, in the drying process, the hot air in the drum 20 is prevented from flowing back to the detergent dissolving device 30, and the air flows between the detergent dissolving device 30 and the tub 12 at normal times except for the water supply process. Will block.

As described above, the drum washing machine according to the present invention is provided with a backflow prevention device consisting of a diaphragm structure in the water supply passage between the detergent dissolving device and the tub to block the flow of air other than the water supply process.

In addition, since the shielding action is achieved by a diaphragm that rotates in the flow path without a trap structure, as in the conventional block structure by the trap structure, the effect of operating stably regardless of vibration caused by the drum or the accumulation of water in the trap is effective. And in particular moisture is prevented from entering the detergent dissolving device.

Claims (5)

A housing, a tub installed in the housing, a detergent dissolving device for supplying detergent and wash water to the tub, a water supply oil connected between the tub and the detergent dissolving device, and installed in the water supply passage and according to the flow of the washing water. A drum washing machine comprising a backflow preventing device that is opened by pressure and normally closed. The water flow preventing device of claim 1, wherein the backflow preventing device protrudes in the water supply passage so that the diaphragm is rotatably installed in the water supply passage so as to open and close the water supply passage, and the diaphragm stops in a state in which the water supply passage is closed. Drum washing machine comprising a stopper formed. According to claim 2, wherein the outer periphery of the diaphragm is provided with two fixing protrusions to form the rotation axis of the diaphragm, the inner periphery of the water supply passage is characterized in that the fixing groove for inserting the fixing protrusion is provided Drum Washing Machine. The drum washing machine according to claim 3, wherein the water supply passage is formed to be inclined downward, and the diaphragm is formed to have a thickness greater than that of the lower portion based on the rotating shaft to close the water supply passage by its own weight.        The drum washing machine according to claim 3, wherein the rotating shaft is provided to be eccentrically upward from the diaphragm.

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