KR101092426B1 - drain system of drum-type washing machine - Google Patents

Abstract

The present invention solves the inconvenience of having to squat and rise when the drainage filter is taken out and installed, and solves a problem that the lower cover cap and the filter cap are difficult to open when the drainage filter is taken out in a conventional drum washing machine. To provide a drum washing machine with a new drainage system.

To this end, the present invention, the outer case; A tub installed inside the outer case and having a drain hole formed at a lowermost side thereof and an overflow hole formed at a predetermined position at an upper side thereof; A drum rotatably installed in the tub; A drive motor transmitting power for drum rotation through a rotation shaft connected to the drum; A filter case made separately from the outer case and installed on the front side of the outer case, the lower end portion being rotated to the front of the outer case with a rotational center and provided with at least one drain inlet and a drain outlet respectively; A drain pipe connecting the drain hole of the tub and the filter case to drain the water inside the tub to the filter case; A drain valve installed to control drainage through the drain pipe of the washing water, the rinsing water, the dehydrating liquid, and the cooling condensate for drying in the tub; A drain filter installed inside the filter case and installed between the drain inlet and the drain outlet; And a drain hose connected to the drain outlet of the filter case to discharge the water introduced into the filter case to the outside.

Drum Washing Machine, Drainage, Filter, Overflow, Handle, Elastic Member

Description

Drain system of drum-type washing machine

1 is a front view showing an example of a conventional drum washing machine

Figure 2 is a side cross-sectional view of the conventional drum washing machine of Figure 1

3 is a front view of the drum washing machine according to the first embodiment of the present invention.

Figure 4 is a side cross-sectional view of Figure 3

5 is a front view of a drum washing machine according to a second embodiment of the present invention.

Figure 6 is a side cross-sectional view of Figure 5

7 is a perspective view showing a drain filter and a handle thereof applied to each embodiment of the present invention;

Explanation of symbols on the main parts of the drawings

1: Outcase 2: Tub

200: drain 210: overflow hole

3: drum 4: driving motor

400: rotary shaft 5: door

6: filter case 600: upper part of the filter case

610: drainage outlet 620: drainage outlet

630: Residual water outlet 640: Handle                 

650: hinge axis 7: drain pipe

8: Drain valve 9: Drain filter

900: net 910: filter takeout handle

10: drain hose 11: filter case detection means

12: Drainage filter detecting means 13: Elastic member

14: Residue outlet plug 15: Door lock switch assembly

16: Filter case lock switch assembly

17: Hook 18: Hook hooking

19: First overflow hose 20: Second overflow hose

21: hanging spring 22: damper

23: control panel 24: lower cover cap

25: gasket 26: filter housing

27: drainage pump

The present invention relates to a drum washing machine, and more particularly, to solve the inconvenience of the user having to sit down and operate the drainage filter when the drainage filter is removed, as well as to effectively eliminate the damage caused to the electrical equipment due to overflow during abnormal water supply. To the drainage system of a new drum washing machine.                         

In general, in the purchase of a home washing machine these days, not only washing performance but also convenience of use have become a very important product purchase factor, and thus, product development for increasing convenience of use has been accelerated.

On the other hand, the drum washing method is a method of washing by using the friction force of the rotating drum and the laundry by receiving the driving force of the motor in a state in which detergent, washing water and laundry are put in the drum, there is almost no damage to the laundry, laundry This is not tangled with each other, but can be washed and rubbed wash effect, but there is an inconvenience in the input and withdrawal of the laundry has been made technology development to improve this.

Hereinafter, an example of a conventional drum washing machine will be briefly described with reference to FIGS. 1 and 2.

1 is a cross-sectional view showing the configuration of a general drum washing machine, a drum washing machine that is supported by a damper 22 and a hanging spring 21 in an outer case 1 and rotatable in the tub 2. It consists of a cylindrical drum (3) and a drive motor (4) installed on the rear side of the tub (2) to generate a rotational force by applying power.

In addition, the drive motor 4 is composed of a stator fixed directly to the rear wall portion of the tub (2) and a rotor installed outside the stator, the drum and to transfer the driving force of the rotor directly to the drum (3) The rotating shaft 400 which rotates together is directly connected to the rotor.

And, the upper part of the door 5 is provided with a control panel 23 for receiving a user's operation command and control the operation of the entire washing machine.                         

In addition, a door 5 is installed in front of the outer case 1, and a gasket 25 is installed between the door 5 and the tub 2.

In addition, the outer case 1 is provided with a door lock switch assembly 15 for locking the door.

Here, the door lock switch assembly 15 is composed of a solenoid and a plunger is a known device for restraining or releasing the door by moving forward and backward depending on whether the power is supplied to the solenoid, the details of which are disclosed in Korean Patent Application No. 2000-0002202 No. 2001-0073574, further description thereof is omitted.

In addition, a hanging spring 21 (Hanging spring) through which the tub is suspended is installed between the inner side of the upper surface of the outer case 1 and the upper side of the outer surface of the tub 2, and the outer side of the outer surface of the tub 2 and the outer case ( 1) Dampers 22 are provided between the lower surfaces to damp vibrations of the tub 2 generated during dehydration.

On the other hand, the lower cover cap 24 is installed in the lower portion of the front of the outer case (1), and the filter housing 26 with a filter for filtering lint and other foreign substances mixed in the wash water therein, and filtered washing A pump assembly composed of a drain pump 27 serving to drain water is installed.

In addition, a drain hose 10 for guiding the washing water pumped by the drain pump 27 to the outside is connected to the outlet side of the pump assembly.

However, the conventional drum washing machine configured as described above opens the lower cover cap 24 using a coin or the like while the user uncomfortably squats when cleaning the filter 9a, and then turns the filter plug which is tightly locked again. Since heat has to take out the filter from the next filter housing 26, there is a problem that a lot of inconvenience is caused in the filter withdrawal.

This inconvenience, which must be squatted and operated, is similarly experienced by the user even when the drain filter is mounted, which is the opposite of the withdrawal.

That is, the general drum washing machine shown in FIG. 1 has a disadvantage in that the user's operation becomes very inconvenient in taking out and installing the drainage filter, thereby lowering the reliability of the product.

In particular, in order to prevent the occurrence of safety accidents caused by children in the conventional drum washing machine, the lower cover cap 24 is made hard to open with bare hands.

As a result, in order to open the lower cover cap 24, the cover cap 24 can be opened only by unfolding it in an uncomfortable squat state using a coin or the like, and even if the cover cap 24 is opened, the filter cap is applied. The drawback of the drainage filter, such as can only take out the filter after opening the subject had a disadvantage of having to suffer a lot of inconvenience and inconvenience.

The present invention has been made to solve the above problems, while eliminating the inconvenience that the user must squat when waking up and mounting the drain filter, while in the conventional drum washing machine when removing the drain filter lower cover cap and filter It is an object of the present invention to provide a drum washing machine having a new drainage system capable of eliminating damage to the electrical appliance due to overflow of the wash water in the event of trouble and opening of the cap.

In order to achieve the above object, the present invention and the case; A tub installed inside the outer case and having a drain hole formed at a lowermost side thereof and an overflow hole formed at a predetermined position at an upper side thereof; A drum rotatably installed in the tub; A drive motor transmitting power for drum rotation through a rotation shaft connected to the drum; A filter case made separately from the outer case and installed on the front side of the outer case, the lower end portion being rotated to the front of the outer case with a rotational center and provided with at least one drain inlet and a drain outlet respectively; A drain pipe connecting the drain hole of the tub and the filter case to drain the water inside the tub to the filter case; A drain valve installed to control the drainage through the drain pipe of the washing water, the rinsing water, the dehydrating liquid, and the cooling condensate for cooling during drying, and a drain filter installed inside the filter case and installed below the drain inlet; And a drain hose connected to the drain outlet of the filter case to discharge the water introduced into the filter case to the outside.

Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 3 to 7.

Figure 3 is a front view of the drum washing machine according to the first embodiment of the present invention, Figure 4 is a side cross-sectional configuration of Figure 3, Figure 7 is a perspective view showing the drain filter and the handle applied to Figure 4.

Drum washing machine according to a first embodiment of the present invention, the outer case (1), the outer casing (1) is installed in the lower side of the drain port 200 is formed and the upper side of the predetermined position of the overflow hole ( A power source for transmitting power for drum rotation through a tub 2 having a 210 formed therein, a drum 3 rotatably installed in the tub 2, and a rotating shaft 400 connected to the drum 3. The in-drive motor 4 and the outer case 1 are made of a separate injection molding product and are installed on the front side of the outer case, and the lower end is rotated to be installed in the front of the outer case 1, A filter case 6 having at least one drain inlet 610 and a drain outlet 620, respectively, and a drain hole of the tub 2 such that water inside the tub 2 is drained to the filter case 6. 200 and the drain pipe (7) connecting between the filter case (6) And a drain valve (8) installed to control the drainage through the drain pipe (7) of the washing water, the rinsing water, the dehydrating liquid, and the cooling condensate for cooling in the tub (2), and the inside of the filter case (6). A drain filter 9 installed below the drain inlet 610 and a drain hose 10 connected to the drain outlet 620 of the filter case 6 to discharge water introduced into the filter case to the outside; It is configured by.

Here, the drain filter 9 is installed inside the filter case 6 but is installed between the drain inlet 610 and the drain outlet 620.

In particular, the drain filter 9 is preferably installed such that its lowest point is higher than the residual water level of the drainage path.

In addition, the upper end 600 of the filter case 6 is characterized in that it is installed to be located at a point of at least 70cm or more from the floor on which the drum washing machine is installed so that the user can stand and operate.

In addition, the upper end 600 of the filter case 6 is installed so as to be located inside the door so that the door 5 is not opened in the open state.

In addition, the filter case 6 is provided with a handle 640 for operation, the filter case operation handle 640 is formed on the upper end 600 of the filter case 6 located inside the door (5). It is preferred to be or installed.

This is to allow the operation for opening the filter case 6 only when the door 5 is opened.

In addition, the drain inlet 610 of the filter case 6 is formed at a point higher than the drain outlet 620.

The drain filter 9 is itself a plastic molded article having a network structure, or a plastic molded article having a mesh 900 of a predetermined mesh.

And, the drain filter (9) is provided with a filter pull-out handle 910, the filter pull-out handle 910 is easily gripped by the user in the open filter case (6) the drain filter (9) It can be formed if it is formed to a length that can be taken out.

In addition, the filter extracting handle 910 is preferably hinged to the upper end of the drain filter 9, which is advantageous for detecting whether the drain filter 9 is mounted correctly.

On the other hand, the door 5 or the outer case 1 is provided with a filter case detecting means 11 for detecting whether the filter case 6 is mounted.                     

Here, the filter case detecting means 11 is turned on or off when the door 5 is opened or closed depending on whether the filter case 6 is located at the correct position to detect whether the filter case 6 is mounted. Preferably, a micro switch is installed.

On the other hand, instead of the contact type micro switch as the filter case detecting means 11, an optical sensor (not shown) consisting of a light emitting part and a light receiving part may be installed.

The filter case 6 side is provided with a filter case lock switch assembly 16 which releases or restrains the filter case 6 under the control of a microcomputer (not shown).

Here, the filter case lock switch assembly 16 is configured and operated on the same principle as the door lock switch assembly.

That is, the filter case lock switch assembly 16 is composed of a solenoid and a plunger and restrains or releases the filter case 6 by advancing back and forth depending on whether power is supplied to the solenoid. It is installed on the outer case (1) or is installed so as to be supported separately in the outer case inner space.

The filter case lock switch assembly 16 is installed to interlock with the filter case detecting means 11.

On the other hand, the filter case 6 is provided with a detection means for detecting whether the drain filter 9 is mounted.

Here, the drain filter detecting means 12 is turned on / off depending on whether the handle 910 of the drain filter 9 is located in the correct position to detect whether the drain filter 9 is mounted and transmit the same to the microcomputer. Preferably, a micro switch is installed.

On the other hand, as the drain filter detecting means 12, instead of a contact type micro switch, an optical sensor (not shown) including a light emitting part and a light receiving part may be installed.

In addition, an elastic member 13 is provided between one side of the filter case 6 and a fixing part inside the outer case 1 to provide a return force so that the filter case 6 is easily opened or closed with a small force. As the elastic member 13, a tension spring for automatically returning the filter case 6 to the closed state is preferably provided, but is not limited thereto.

For example, as the elastic member 13, a torsion spring installed at the hinge portion to which the lower end of the filter case 6 is rotatably coupled may be applied.

That is, although not illustrated in the drawings, when one end of the torsion spring fitted to the hinge shaft 650 is caught in the fixed hinge portion, and the other end of the torsion spring is caught on one side of the rotatable filter case 6, the torsion spring is described above. Like the tension spring, it is possible to play a role of imparting a return force in the opening or closing direction with respect to the filter case.

In particular, a hinge assembly composed of a torsion spring, a tension adjusting spring washer and a lock nut, etc., is installed at a hinge portion of which the lower end of the filter case 6 is rotatably coupled to the filter case, thereby providing a torque of a predetermined size at the hinge portion. ) May stop at that position depending on how far the user has opened it.

In this case, the size of the torsion moment applied to the hinge shaft 650 and the torsion spring installed on the hinge shaft 650 of the hinge part are equal to the size of the torsion moment due to its own weight when the filter case 6 is opened. The moment due to the force applied to the hinge portion of the filter case 6 is always in an overall equilibrium state.

On the other hand, at least an end portion of the drain pipe 7 connected to the drain inlet 610 of the filter case 6 forms a corrugated pipe structure to allow extension and contraction according to the rotation of the filter case 6. This is to enable the rotation of the filter case 6 while minimizing the length of the pipe 7.

In addition, the drain hose 10 connected to the drain outlet 620 of the filter case 6 is also preferably a corrugated pipe structure, of course, if it is flexible and there is room in the length, it may not necessarily be a corrugated pipe.

On the other hand, in the vicinity of the lowest point of the filter case 6, a residual water outlet 630 for remaining water discharge is formed, and the residual water outlet 630 is provided with a residual water outlet stopper 14 for selective opening and closing of the residual water outlet.

In addition, a first overflow hose 19 is connected between the tub side overflow hole 210 and the filter case 6 formed at a predetermined position on the upper side of the drain hole 200 of the tub 2.

In addition, a second overflow hose 20 is connected to the overflow hole 210 of the upper end of the filter case 6, and an end of the second overflow hose 20 penetrates the bottom surface.

At this time, the end of the second overflow hose 20 may be installed through the rear wall of the outer case, of course, the end of the second overflow hose 20 is the filter case side overflow hole 210 ) Is installed at a lower point.

In addition, it is preferable that the second overflow hose 20 connected to the filter case side overflow hole 210 of the upper end of the filter case 6 also has a corrugated pipe structure to allow extension and contraction according to rotation of the filter case. However, it is not necessarily a corrugated pipe as long as it is flexible and there is room in its length.

Meanwhile, a hanging spring 21 is installed between the outer case 1 and the tub 2 so that the tub 2 is suspended inside the outer case 1, and the tub is disposed at a predetermined position under the tub 2. A damper 22 is provided to damp the vibration of the.

Here, it is preferable that the damper 22 is provided with a friction damper that performs damping by frictional force while the length thereof varies along the axial direction when vibration occurs.

The operation of the drum washing machine of the present invention configured as described above is as follows.

The operation of the drive motor 4 and the drum 3 during washing, rinsing, and dehydration is carried out on the same principle as in the conventional direct drum washing machine.

However, the drum washing machine of the present invention has a difference in the drainage process during the washing, rinsing, and dehydration, and withdrawal and mounting structure of the drain filter 9 filtering the foreign matter in the washing water during the draining process, and its operation principle. Is different.

First, referring to the drainage process, when the drain valve 8 is opened and opened, water accumulated inside the tub 2 flows through the drain pipe 7 and is inside the filter case through the drain inlet 610 of the filter case 6. Flows into.

The wash water introduced into the filter case 6 passes through a drain filter 9 installed between the drain inlet 610 and the drain outlet 620 to the drain hose 10 through the drain outlet 620. Get out.

At this time, the drain filter 9 is preferably installed so that the lowest point is located at a point higher than the residual water level of the drainage path, which is the filter when the drain filter 9 is immersed in the residual water that is standing for too long This can be caused by odor from the remaining water.

However, of course, the lowest point of the drain filter 9 does not necessarily have to be higher than the residual water level, which is even more so when there is a residual water outlet 630 as described below.

That is, according to the present embodiment, the front surface or the lower side of the filter case 6 is provided with a residual water discharge port 630 for discharging the residual water and a residual water discharge stopper 14 for selectively opening and closing the residual water. It can be removed to prevent the phenomenon caused by the decay of the residual water in advance, and also to solve the problem such that the filter case (6) is damaged or drainage is not properly due to the frozen residue in the winter. .

In addition, the drum washing machine according to the present embodiment has a first overflow hose 19 between the tub side overflow hole 210 formed at a predetermined position on the upper side of the drain hole 200 of the tub 2 and the filter case 6. When the water rises more than a predetermined level inside the tub 2 due to continuous water supply due to an abnormality of the water supply device, the water is discharged to the outside through the overflow hole 210 so that the water inside the drum washing machine is discharged. It is possible to effectively prevent the problems caused by the electronic parts wet with overflowed water.

As described above, in solving the problems associated with the overflow, the end of the drain hose 10 should be located below the overflow hole 210, of course.

On the other hand, the drum washing machine of the present invention has an effect that the user can easily operate because the upper end 600 of the filter case 6 is installed to be located at a point of at least 70cm or more from the bottom of the drum washing machine.

That is, the inconvenience of having to bend the knees and squat out the filter as in the prior art is eliminated.

On the other hand, the drum washing machine according to the present embodiment, the filter case 6 is provided with a handle 640 so that the filter case 6 does not lean forward when the door 5 is not opened. 5) It is installed to be located inside the door in the closed state.

Therefore, when the drain filter 9 is pulled out, the door 5 is opened, and then the locking case of the filter case 6 is released, and the handle 640 is gripped to pull the filter case 6 forward.

At this time, by adjusting the elastic force of the elastic member 13 for the return of the filter case 6, the filter case 6 can be opened smoothly.

Then, while holding the filter case (6) open the handle 910 coupled to the drain filter (9) to take out the drain filter.

On the other hand, when the door 5 is opened before opening the filter case 6 as described above, the plunger of the filter case lock switch assembly 16 installed on the side of the filter case 6 moves backward to open the filter case 6. Released.

Here, the filter case lock switch assembly 16 is composed of a solenoid and a plunger, and is a device for restraining or releasing the filter case 6 by advancing back and forth depending on whether power is supplied to the solenoid.

In addition, the filter case lock switch assembly 16 is preferably installed to interlock with the filter case detecting means 11.

That is, the contact of the micro switch is turned on or off depending on whether the filter case 6 is located in the correct position. The filter case lock switch assembly 16 restrains the filter case 6 in conjunction with the switching operation. The release will be performed.

Meanwhile, as described above, the filter case detecting unit 11 may be provided with an optical sensor (not shown) including a light emitting unit and a light receiving unit instead of a contact type micro switch.

When the drain filter 9 is drawn out, the drain filter detecting means 12 detects whether or not the filter is installed inside the filter case 6. 9) is detected, and this detection signal is transmitted to the microcomputer.

That is, the handle 910 of the drain filter 9 presses the contact point of the micro switch, which is one of the drain filter detecting means 12, to turn on or off the switch, and the microcomputer recognizes that the drain filter 9 is drawn out. Done.                     

The reason why the drain filter detecting means 12 should be provided is that, if the filter case 6 is not fitted with the drain filter 9, the filter case 6 and the door 5 are closed, and the washing and If dehydration or the like proceeds, foreign matters such as lint, buttons, metal pins, rubber bands or wrongly input precious metals, etc. contained in the laundry wastewater may be discharged without being filtered out, and thus, the handle 910 of the drain filter 9 Does not press the contact point of the micro switch so that the filter case 6 or the door 5 is not closed when it is determined that the drain filter 9 is not mounted, or even if it is closed, no locking is performed and an alarm is issued instead. This is to display this on the display window so that the user can recognize this and prevent the phenomenon that proceeds without the drain filter 9.

In other words, the filter case lock switch assembly 16 fails to lock the filter case 6 in the state where it is determined that the drain filter 9 is not mounted, or the door lock switch assembly 15 locks the door 5. This prevents the washing machine from working.

In the above, preventing the locking of the filter case 6 is achieved by controlling the microcomputer to prevent the filter case lock switch assembly 16 from restraining the filter case, and preventing the locking of the door 5. This is accomplished by the microcomputer controlling the door lock switch assembly 15 from restraining the door.

On the other hand, in contrast to the above, when the drain filter 9 and the filter case 6 is positioned in the correct position, the drain filter 9 and the filter case detecting means 11 by the drain filter detecting means 12 and the filter case detecting means 11. When it is determined that the filter case 6 is mounted in the correct position, the filter case lock switch assembly 16 and the door lock switch assembly 15 lock the filter case 6 and the door 5, respectively, under the control of the microcomputer. Done.

In the above-described drain filter detection means 12, instead of the contact type micro switch, an optical sensor (not shown) for detecting whether or not the filter is mounted based on whether the light of the light emitting unit reaches the light receiving unit may be installed.

Meanwhile, referring to FIG. 7, the structure of the drain filter 9 is a plastic molded body having a network structure as it is, or a plastic molded body having a mesh 900 of a predetermined mesh. Preferably, the handle 910 is hingedly coupled to the upper end of the molded body.

In this case, the drain filter 9 may be applied regardless of the geometric shape as long as it has a function of filtering out foreign matter even if it is a hollow cylindrical or conical shape or a square column shape.

The drum washing machine according to the present invention configured as described above can easily draw out the drain filter 9 in a line state, unlike the conventional one, in which the user squats and pulls out the filter in an uncomfortable manner. Done.

In addition, the drum washing machine of the present invention has a height higher than that of the conventional drum 3 due to the tall filter case 6, so that the user does not bend when taking out and inserting laundry through the door 5. There is an advantage that you can easily take out or put in the laundry stretched out by hand only.

On the other hand, Figure 5 is a front view of a drum washing machine according to a second embodiment of the present invention, Figure 6 is a side cross-sectional view along the line I-I of Figure 5, almost the same configuration as in the first embodiment described above However, there are only some differences.

First, this embodiment, unlike the first embodiment, shows that the tub 2 and the drum 3 are not inclined.

In addition, the present embodiment, unlike the first embodiment, shows that the door side of the front of the outer case 1 is not inclined.

In addition, unlike the first embodiment, the present embodiment shows a case in which the filter case 6 is installed at a portion outside the door 5.

On the other hand, the present invention is not limited to the above-described embodiments, it is possible to change the shape, installation location, material, as well as without departing from the scope of the technical idea of the present invention.

For example, the handle 910 of the drain filter 9 is not a rotated structure but a fixed structure, and when the drain filter 9 is mounted inside the filter case, the plastic molded object or the handle 910 may interfere with or be in close proximity to the drain filter 9. A sensor or switch for detecting whether the drain filter 9 is mounted may be provided.

In addition, instead of the electric filter case lock switch assembly 16, a locking means for mechanically maintaining the closed state of the filter case may be provided on one side of the filter case 6.

Here, the locking means includes a hook 17 provided on the filter case 6 side, and a hook engaging piece 18 separately installed in the outer case 1 or the inside thereof so as to correspond to the hook 17. It is configured by.

As described above, the present invention, unlike the conventional washing machine, when the user is uncomfortable squatting to open the lower filter cap and pull out the filter in the drum washing machine, it is possible to draw the drain filter in the line state Product reliability can be increased by providing the user with convenience.

In addition, the drum washing machine of the present invention has a height greater than that of the conventional drum due to a tall filter case, so that the user can easily take out or insert laundry by extending his or her hand without having to bend the body when taking out and inserting the laundry through the door. There is an advantage to this.

In addition, the drum washing machine of the present invention can solve the damage to the electrical equipment due to the overflow of the wash water when an abnormality occurs, there is an effect that increases the product reliability.

Claims (27)

With an outcase; A tub installed inside the outer case and having a drain hole formed at a lowermost side thereof and an overflow hole formed at a predetermined position at an upper side thereof; A drum rotatably installed in the tub; A drive motor transmitting power for drum rotation through a rotation shaft connected to the drum; A filter case made separately from the outer case and installed on the front side of the outer case, the lower end portion being rotated to the front of the outer case with a rotational center and provided with at least one drain inlet and a drain outlet respectively; A drain pipe connecting the drain hole of the tub and the filter case to drain the water inside the tub to the filter case; A drain valve installed to control drainage through the drain pipe of the washing water, the rinsing water, the dehydrating liquid, and the cooling condensate for drying in the tub; A drain filter installed inside the filter case and filtering foreign matter from water introduced into the filter case; And a drain hose connected to the drain outlet of the filter case to discharge the water introduced into the filter case to the outside. The method of claim 1, The drain filter is a drum washing machine, characterized in that the lowest point is installed at a point higher than the residual water level of the drainage path. The method of claim 1, Drum washing machine, characterized in that the upper end of the filter case is located at least 70cm from the bottom of the washing machine. The method of claim 1, Drum washing machine, characterized in that the upper end of the filter case is installed to be located inside the door of the drum washing machine. The method of claim 4, wherein Drum washing machine, characterized in that the handle for the filter case is installed in the door inner position of the drum washing machine. The method of claim 1, The filter case is a drum washing machine, characterized in that the handle is provided for the operation of the filter case. The method of claim 1, The drain filter is a drum washing machine, characterized in that the plastic molded body of the network structure. The method of claim 1, And said drain filter has a mesh of a predetermined mesh. 9. The method according to claim 7 or 8, Drum washing machine, characterized in that the drain filter is provided with a filter pull-out handle. The method of claim 1, The filter takeout handle is a drum washing machine, characterized in that the hinge coupled to the upper end of the drain filter. delete delete delete delete delete delete The method of claim 1, In the outer case of the filter case side or the inner space of the outer case, And a filter case lock switch assembly for releasing the filter case under the control of a microcomputer. The method of claim 17, The filter case lock switch assembly, A drum washing machine comprising a solenoid and a plunger which restrains or releases a filter case by advancing back and forth depending on whether power is supplied to the solenoid. The method of claim 1, Between the filter case one side and the fixing portion inside the outer case, Drum washing machine, characterized in that provided with an elastic member for automatically returning the filter case. The method of claim 19, As the elastic member, Drum washing machine, characterized in that the tension spring is provided to give a return force in the opening or closing direction with respect to the filter case. The method of claim 1, The hinge portion of the lower filter case drum washing machine, characterized in that the torsion spring is provided to give a return force in the opening or closing direction with respect to the filter case. The method of claim 1, And a drain pipe connected to the drain inlet of the filter case and a drain hose connected to the drain outlet of the filter case form a corrugated pipe structure to extend and contract according to rotation of the filter case. The method of claim 1, Drum washing machine characterized in that the remaining water outlet for the remaining water is formed in the vicinity of the lowest point of the filter case, the remaining water outlet is provided with a stopper for the remaining water outlet for the selective opening and closing of the remaining water outlet. The method of claim 1, One side of the filter case drum washing machine characterized in that it is further provided with a locking means for maintaining the filter case closed. The method of claim 24, The locking means, A hook provided at the filter case side; Drum washing machine, characterized in that configured to include a hook engaging piece that is separately installed in the outer case or the inside to correspond to the hook. The method of claim 1, A first overflow hose is connected between the tub side overflow hole formed at a predetermined position on the upper side of the drain port of the tub and the filter case. A second overflow hose is connected to the filter case side overflow hole of the upper part of the filter case, Drum end of the second overflow hose is installed so as to be located at a point lower than the filter hole side overflow hole penetrates the bottom surface or the rear wall of the outer case. The method of claim 26, And a second overflow hose connected to the filter case side overflow hole at the upper end of the filter case to form a corrugated pipe structure to extend and contract according to rotation of the filter case.

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