JP7423871B2 - Drum washing machine and its control method - Google Patents

Description

The present invention relates to the technical field of washing equipment, and specifically relates to a drum washing machine and a method for controlling the same.

Washing machines are the most widely used household appliances in daily life, freeing people from the hassle of washing clothes and providing great convenience. However, washing machines also have certain drawbacks, such as the length of time they take and the amount of water they use. On the other hand, with the development of society, water resources are becoming increasingly important as an important natural resource. Along with this, people's awareness of water conservation has increased, and it has become especially important to realize the water-saving function of washing machines.

In order to solve the problem of water conservation in washing machines, patent applications such as Patent Document 1 have been filed up to now. Patent Document 1 is a Chinese invention patent entitled "Drum Washing Machine". The present invention relates to a drum washing machine including a housing, and an inner tub and an outer tub are provided within the housing. A door seal is provided between the outer tank and the housing, and the inner tank is connected to a drive device. The inner tank is a holeless inner tank. Further, the inner tank is a conical tank with a small diameter at the bottom and a large diameter at the mouth. The mouth of the inner tank contracts inward in an arc shape. Further, the door seal is provided with a water supply conduit. One end of the water supply conduit is connected to the wash water rapid heating device, and the other end of the water supply conduit extends through the door seal and into the inner tank. The outer tank is provided with a drain port and a water pressure detection device. As is clear from the above technical solution, the inner tank in the invention is a holeless inner tank, and water is supplied to the inner tank by a water supply conduit installed in the door seal, and the shape of the inner tank itself is used to supply water to the inner tank. Drainage is achieved during the dehydration process. By doing this, it is possible to avoid water accumulation between the inner tank and the outer tank, resulting in a significant saving in the amount of water used for cleaning.

Although the above-mentioned invention provides a drum washing machine having an inner tub without holes, it is merely a design in which the inner tub of a conventional drum washing machine has a structure without holes, and has little practical significance. This is because in order to wash clothes, it is necessary to soak them in a certain amount of washing water, and in order to realize the effect of soaking, a certain amount of water must be maintained in the non-porous inner tank. Furthermore, in this case, the load on the motor increases and problems such as power consumption also arise. In addition, in the drum washing machine water supply method disclosed in Patent Document 1, water passes through a door seal. However, the main role of the door seal is to seal the mouth of the outer tub of the washing machine. Therefore, if a water supply conduit is installed in the door seal, the sealing effect of the door seal is likely to be impaired, making it difficult to achieve sealing. Moreover, in Patent Document 1, detection of the water supply level in the inner tank cannot be realized.

In addition, how to realize drainage and dewatering of drum washing machines that use an inner tub without holes is another technical issue that needs to be solved.

In view of the above, the present invention is proposed.

China Patent Application No. 201410215346.3

In order to solve the above problems, a first object of the present invention is to provide a drum washing machine. Specifically, the following technical measures will be used.

The drum washing machine includes an inner tank in which washing water is stored when washing clothes. The inner tank has an inner tank opening, an inner tank bottom facing the inner tank opening, and an inner tank wall connected to surround the inner tank bottom to form an internal storage chamber. Moreover, the inner tank wall has an inner diameter enlarged portion and/or an inner diameter reduced portion. The inner diameter of the enlarged inner diameter region gradually increases from the inner tank mouth toward the inner tank bottom, and the inner diameter of the inner diameter reduced region gradually decreases from the inner tank mouth toward the inner tank bottom.

Further, a drainage device is installed near the maximum end of the inner diameter of the inner diameter enlarged portion and/or the inner diameter reduced portion of the inner tank wall.

Further, the minimum inner diameter end of the enlarged inner diameter portion is close to the inner tank mouth, and the largest inner diameter end of the enlarged inner diameter portion extends toward the center of the inner tank wall. Further, the smallest end of the inner diameter of the reduced inner diameter portion is close to the bottom of the inner tank, and the largest end of the inner diameter of the reduced inner diameter portion extends toward the center of the inner tank wall. This forms an inner tank having a small inner diameter at both ends and a larger inner diameter at the center.

Preferably, if the axial length of the inner diameter enlarged portion is H1 and the axial length of the inner diameter reduced portion is H2, then H1≧H2, and preferably H1=H2. Furthermore, if the included angle between the side wall of the inner diameter enlarged portion and the horizontal plane is A, and the included angle between the side wall of the inner diameter reduced portion and the horizontal plane is B, then A and B are 0°≦A≦B≦45°.

Furthermore, it includes a flat and straight portion of the inner diameter. The inner diameter flat and straight portion is located at the center of the inner tank, and both ends thereof are connected to the maximum inner diameter end of the enlarged inner diameter portion and the largest inner diameter end of the reduced inner diameter portion, respectively. Further, a drainage device is installed at the flat and straight portion of the inner diameter.

Further, if the axial length of the inner diameter enlarged portion is H1, the axial length of the inner diameter reduced portion is H2, and the axial length of the inner diameter flat portion is H3, then H1≧H2≧H3. , preferably these will be H1=H2>H3. Alternatively, these become H1<H3 and H2<H3.

Let A be the included angle between the side wall of the inner diameter enlarged portion and the horizontal plane, and B be the included angle between the side wall of the inner diameter reduced portion and the horizontal plane. Further, the inner diameter flat and straight portion has a cylindrical cylindrical structure, and the included angle between the inner diameter flat and straight portion and the horizontal plane is C. In this case, A, B, and C satisfy 0°≦A≦B≦45° and C=0°.

Further, the maximum inner diameter end of the reduced inner diameter portion is close to the inner tank opening, and the smallest inner diameter end of the reduced inner diameter portion extends toward the center of the inner tank wall. Further, the maximum inner diameter end of the enlarged inner diameter portion is close to the bottom of the inner tank, and the smallest end of the inner diameter of the enlarged inner diameter portion extends toward the center of the inner tank wall. As a result, an inner tank having a large inner diameter at both ends and a small inner diameter at the center is formed. Further, a first drainage device is installed near the maximum inner diameter end of the inner diameter enlarged portion on the inner tank wall, and a second drainage device is installed near the inner diameter maximum end of the inner diameter reduced portion on the inner tank wall. .

Furthermore, if the axial length of the inner diameter reduced portion is H4 and the axial length of the inner diameter enlarged portion is H5, then H4≧H5, and preferably H4=H5.

When the included angle between the side wall of the inner diameter reduced portion and the horizontal plane is D, and the included angle between the side wall of the inner diameter enlarged portion and the horizontal plane is E, then D and E satisfy 0°≦D≦E≦45°.

Further, the inner tank wall includes a first flat and straight part and a second flat and straight part. The first flat and straight inner diameter portion is connected to the largest end of the inner diameter of the reduced inner diameter portion, and the second flat and straight portion of the inner diameter is connected to the largest end of the inner diameter of the enlarged inner diameter portion. The first drainage device is installed at the first flat and straight portion of the inner diameter, and the second drainage device is installed at the second flat and straight portion of the inside diameter.

Furthermore, the axial length of the inner diameter reduced portion is H4, the axial length of the inner diameter enlarged portion is H5, the axial length of the first inner diameter flat and straight portion is H6, and the axis of the second inner diameter flat and straight portion. If the length in the direction is H7, then H4≧H5≧H6=H7, and preferably H4=H5>H6=H7.

Let D be the included angle between the side wall of the inner diameter reduced portion and the horizontal plane, and E be the included angle between the side wall of the inner diameter enlarged portion and the horizontal plane. Further, both the first inner diameter flat and straight portion and the second inner diameter flat and straight portion have a cylindrical structure. Furthermore, let F be the included angle between the first flat and straight inner diameter portion and the horizontal plane, and let G be the included angle between the second flat and straight inner diameter portion and the horizontal plane. In this case, D, E, F, and G satisfy 0°≦D≦E≦45°, and F, G=0°.

Further, the inner tank wall has an enlarged inner diameter portion and a flat and straight inner diameter portion. The inner diameter of the inner diameter flat straight portion is greater than or equal to the inner diameter of the maximum end of the inner diameter enlarged portion. The inner diameter enlarged portion gradually moves and expands from the inner tank mouth toward the inner tank bottom, and the inner diameter flat and straight portion is connected to the maximum inner diameter end of the inner diameter enlarged portion. Further, the drainage device is installed at a flat and straight portion of the inner diameter.

Further, the inner diameter flat and straight portion has a cylindrical cylindrical structure. One end of the inner diameter flat straight portion is connected to the largest inner diameter end of the inner diameter enlarged portion, and the other end is connected to the outer periphery of the inner tank bottom in the circumferential direction. The drainage device includes at least one drainage hole provided in the circumferential direction of the flat and straight portion of the inner diameter, and a centrifugal valve attached to the drainage hole to control opening/closing of the drainage hole.

Furthermore, the inner tank wall has a reduced inner diameter portion and a flat inner diameter portion. The inner diameter of the flat and straight inner diameter portion is greater than or equal to the inner diameter of the maximum end of the reduced inner diameter portion. The inner diameter reduced portion gradually moves and reduces from the inner tank mouth toward the inner tank bottom, and the inner diameter flat and straight portion is connected to the maximum inner diameter end of the inner diameter reduced portion. Further, the drainage device is installed at a flat and straight portion of the inner diameter.

Furthermore, the inner diameter flat and straight portion has a cylindrical structure. One end of the flat and straight portion of the inner diameter is connected to the largest end of the inner diameter of the reduced inner diameter portion, and an inner tank sealing door that can be opened/closed is attached to the other end. The drainage device includes at least one drainage hole provided in the circumferential direction of the flat and straight portion of the inner diameter, and a centrifugal valve attached to the drainage hole to control opening/closing of the drainage hole.

Further, if the axial length of the inner diameter enlarged portion/inner diameter reduced portion is H and the axial length of the inner diameter flat portion is h, then H≧h. Further, when the included angle between the side wall of the inner diameter enlarged portion/inner diameter reduced portion and the horizontal plane is A, the above A satisfies 0°≦A≦45°.

Furthermore, an annular water collection groove along the circumferential direction of the inner wall and an axial water collection groove that penetrates and communicates with the annular water collection groove in the axial direction are provided in the inner diameter enlarged part/inner diameter reduced part and/or the inner diameter flat and straight part. It is provided.

Further, a plurality of first annular water collecting grooves and a second annular water collecting groove provided at the maximum inner diameter end are sequentially installed in the axial direction on the inner wall of the inner diameter enlarged portion/inner diameter reduced portion. Further, the axial water collecting groove sequentially penetrates the first annular water collecting groove and the second annular water collecting groove to communicate with each other. Further, the drainage device is installed within the second annular water collection groove.

Preferably, the groove width in the second annular water collection groove is larger than the groove width in the first annular water collection groove.

Furthermore, a plurality of first annular water collecting grooves are sequentially provided in the inner wall of the inner diameter enlarged portion/inner diameter reduced portion along the axial direction, and at least one third annular water collecting groove is provided in the inner wall of the inner diameter flat portion. A water collection ditch is provided. Further, the axial water collecting groove sequentially penetrates the first annular water collecting groove and the third annular water collecting groove to communicate with each other.

Preferably, the groove width in the third annular water collection groove is larger than the groove width in the first annular water collection groove.

A second object of the present invention is to provide a method for controlling a drum washing machine. Specifically, the following technical measures will be adopted.

In the drum washing machine control method, the washing machine includes an inner tub, and washing water is stored in the inner tub when washing clothes. A drainage hole is provided in the side wall of the inner tank, and a drainage device is attached to the drainage hole to control opening/closing of the drainage hole. Additionally, the drainage device is a centrifugal valve. As a control method, during the washing process of the washing machine, the rotational speed of the inner tub is controlled to be equal to or higher than a predetermined rotational speed N0, so that the centrifugal valve receives centrifugal force and opens the drain hole, thereby draining water from the inner tub. Perform drainage.

The present invention provides a front-opening drum washing machine having an inner tub without holes. This structure is simple, and since there is no need to fill washing water/rinsing water between the inner tub and the outer tub, the amount of washing water in the washing machine can be significantly reduced. Furthermore, the possibility of dirt adhering between the inner tank and the outer tank is also avoided. Thus, user health and user experience are greatly improved, and huge water resources are saved.

The inner tank wall of the inner tank of the drum washing machine according to the present invention has an enlarged inner diameter region and a reduced inner diameter region. During drainage, the drainage device is opened by centrifugal force as the inner tank rotates. In addition, the centrifugal force in the direction of the tank wall of the enlarged inner diameter region and the reduced inner diameter region causes the cleaning water in the inner tank to move along the tank wall of the enlarged inner diameter region and the reduced inner diameter region toward the maximum inner diameter end, It acts to drain water from the drainage device installed at the maximum inner diameter end of the inner diameter enlarged portion and the inner diameter reduced portion.

Therefore, the inner tank structure of the drum washing machine of the present invention can effectively realize efficient dewatering and drainage using centrifugal force in the inner tank without holes and drainage method using centrifugal force. It is.

FIG. 1 is a diagram showing the principle of a drum washing machine according to a first embodiment of the present invention. FIG. 2 is a principle diagram of a drum washing machine in Example 2 of the present invention (Embodiment 1). FIG. 3 is a principle diagram of a drum washing machine in Example 2 of the present invention (Embodiment 2). FIG. 4 is a principle diagram of a drum washing machine in Example 2 of the present invention (Embodiment 3). FIG. 5 is a principle diagram of a drum washing machine according to a third embodiment of the present invention. FIG. 6 is a partially enlarged view of FIG. 5 (in a reduced pressure state) of a drum washing machine according to a third embodiment of the present invention. FIG. 7 is a partially enlarged view of FIG. 5 (in an increased pressure state) of a drum washing machine according to a third embodiment of the present invention. FIG. 8 is a diagram showing the principle of a drum washing machine according to a fourth embodiment of the present invention. FIG. 9 is a partially enlarged view of FIG. 8 of the drum washing machine according to the fourth embodiment of the present invention (depressurized state according to the first embodiment). FIG. 10 is a partially enlarged view of FIG. 8 of the drum washing machine in Example 4 of the present invention (in a pressure-increasing state of Embodiment 1). FIG. 11 is a partially enlarged view of FIG. 8 of a drum washing machine according to a fourth embodiment of the present invention (depressurized state according to the second embodiment). FIG. 12 is a partially enlarged view of FIG. 8 of a drum washing machine according to a fourth embodiment of the present invention (in a pressure-increasing state according to the second embodiment). FIG. 13 is a principle diagram of a drum washing machine according to a fifth embodiment of the present invention. FIG. 14 is a bottom view of a drum washing machine in Example 5 of the present invention. FIG. 15 is a diagram showing the three-dimensional structure of a drum washing machine in Example 5 of the present invention. FIG. 16 is a partially enlarged view of FIG. 15 of a drum washing machine according to a fifth embodiment of the present invention. FIG. 17 is a principle diagram of a drum washing machine in Example 6 of the present invention (Embodiment 1). FIG. 18 is a principle diagram of a drum washing machine in Example 6 of the present invention (Embodiment 2). FIG. 19 is a flowchart of an embodiment of a drum washing machine control method in Example 7 of the present invention. FIG. 20 is a principle diagram of a drum washing machine in Example 8 of the present invention. FIG. 21 is a partially enlarged view of FIG. 20 of a drum washing machine in Example 8 of the present invention. FIG. 22 is a principle diagram of a drum washing machine in a further embodiment of Example 8 of the present invention. FIG. 23 is a principle diagram of a drum washing machine according to a ninth embodiment of the present invention. FIG. 24 is a partially enlarged view of FIG. 23 of a drum washing machine according to a ninth embodiment of the present invention. FIG. 25 is a principle diagram of a drum washing machine in a further embodiment of Example 9 of the present invention. FIG. 26 is a partially enlarged view of FIG. 25 of a drum washing machine according to a ninth embodiment of the present invention. FIG. 27 is a principle diagram of a drum washing machine in a further embodiment of Example 9 of the present invention. FIG. 28 is a partially enlarged view of FIG. 27 of a drum washing machine according to a ninth embodiment of the present invention. FIG. 29 is a principle diagram of a drum washing machine in Example 10 of the present invention. FIG. 30 is a partially enlarged view of FIG. 29 of the drum washing machine in Example 10 of the present invention. FIG. 31 is a diagram showing the inner tub structure of a drum washing machine in Example 10 of the present invention. FIG. 32 is a partially enlarged view of FIG. 31 of the drum washing machine in Example 10 of the present invention. FIG. 33 is a principle diagram of a drum washing machine in Example 11 of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Below, the drum washing machine and its control method according to the present invention will be described in detail with reference to the drawings.

As shown in FIGS. 1 to 18, this embodiment provides a front-opening drum washing machine having an inner tub without holes. This structure is simple, and since there is no need to fill washing water/rinsing water between the inner tub and the outer tub, the amount of washing water in the washing machine can be significantly reduced. Furthermore, the possibility of dirt adhering between the inner tank and the outer tank is also avoided. Thus, user health and user experience are greatly improved, and huge water resources are saved.

The drum washing machine of this embodiment has a housing 19. Housing 19 includes a top panel 2, a front panel, a rear panel, and a bottom plate. A bottom leg 9 for supporting the entire washing machine is attached and fixed to the bottom plate. An outer tank 18 is provided inside the housing 19, and an inner tank 17 is installed coaxially within the outer tank 18. The main purpose of the outer tank 18 is to collect the waste water from the inner tank 17 and the waste water accompanying the dewatering of the inner tank 17 due to high-speed centrifugal force. When the inner tub 17 rotates (preferably, lifting ribs 43 are installed), the clothes are washed by continuously moving up and down and hitting the clothes. The inner tank 17 has a structure without holes. Further, the outer tank 18 has a center mounting hole into which the bearing 12 is mounted and fixed. In addition, an inner tank shaft 13 firmly connected to the inner tank 17 is inserted through the bearing 12 and connected to a drive motor 16 . An open/closeable inner tank door 6 is attached to the front tank mouth of the inner tank 17, thereby realizing a sealed chamber structure of the inner tank 17.

A main body door 5 that can be opened/closed is attached to the housing 19 of this embodiment.

This embodiment mainly solves the problem of how to accurately determine the water supply amount for a drum washing machine having an inner tub without holes. The specific measures are as follows.

The drum washing machine includes an inner tub 17 and a water supply pipe communicating with the inner tub 17. The inner tank 17 is a holeless inner tank in which washing water is stored when washing clothes. Further, a flow rate sensor 1 for detecting the flow rate of water supply is installed in the water supply pipe.

In this embodiment, a flow rate sensor 1 is installed in the water supply pipe to monitor the flow rate during water supply, and when a predetermined water supply amount is reached, the water supply valve 20 is closed to complete the water supply. In this embodiment, a flow rate sensor is used to solve the problem of water supply based on a predetermined water level of a drum washing machine having an inner tub without holes, so that the cleaning effect is ensured. Furthermore, the structure is simple and control is easy.

Further, the drum washing machine of this embodiment includes a water supply valve 20 and a detergent case 3. The water supply pipe includes a first water supply pipe and a second water supply pipe. The outlet end of the water supply valve 20 communicates with the detergent case 3 through a first water supply pipe, and the outlet end of the detergent case 3 communicates with the inner tank 17 through a second water supply pipe. The flow rate sensor 1 is installed in a first water supply pipe or a second water supply pipe.

Preferably, the flow rate sensor 1 is installed in the first water supply pipe. This makes it possible to prevent the detergent in the detergent case from entering the flow rate sensor 1.

The drum washing machine of this embodiment includes a main controller 4. The flow rate sensor 1 and the main controller 4 are electrically connected through a circuit. The main controller 4 can collect the amount of water supplied to the inner tank 17 in real time, and closes the water supply valve 20 when a predetermined amount of water is reached.

In one embodiment of this example, the flow rate sensor 1 is a rotor flow sensor, a turbine flow sensor, an ultrasonic flow sensor, an electromagnetic flow sensor, or an orifice flow sensor.

The flow rate sensor 1 can be installed at any position in the water supply pipe in this embodiment, but is preferably installed at the rear of the water supply valve 20 to accurately measure the flow rate of water entering the sealed inner tank 17. to be measured. The circuit of the flow rate sensor 1 is connected to a main controller 4. The main controller 4 can collect the amount of water supplied to the inner tank 17 in real time, and closes the water supply valve 20 when a predetermined amount of water is reached.

In order to supply water to the inner tub without holes in this embodiment, the drum washing machine of this embodiment includes a drive motor 16 and an inner tub shaft 13. The drive motor 16 is communicably connected to the inner tank 17 via the inner tank shaft 13, and rotates the inner tank 17. The inner tank shaft 13 is provided with a hollow passage 14 that communicates with the inside of the inner tank 17 , and the water supply pipe communicates with the hollow passage of the inner tank shaft 13 .

Specifically, the inner tank shaft 13 is connected to a drive motor 16. The drive motor 16 includes a stator and a rotor, and the rotor is fixedly connected to the inner tank shaft 13. A through hole is provided in the center of the rotor, and the water supply pipe passes through the through hole of the rotor and communicates with the hollow passage 14 of the inner tank shaft 13.

Furthermore, a first dynamic seal structure 15 is provided between the water supply pipe and the rotor through hole, and a second dynamic seal structure is provided between the rotor through hole and the hollow path 14 of the inner tank shaft 13. is provided.

In order to realize drainage from the inner tub without holes, the drum washing machine of this embodiment includes an outer tub 18. An inner tank drainage hole is formed in the side wall of the inner tank 17, and a normally closed check valve plug 11 is attached to the inner tank drainage hole. Further, a push-up rod mechanism 10 for pushing open the check valve plug 11 to drain water is attached to the outer tank 18.

Preferably, the outer tank 18 is further provided with a locking mechanism for locking the rotation of the inner tank 17. After the locking mechanism locks the inner tank, the push-up rod mechanism 10 pushes open the check valve plug 11 to drain water.

In order to realize dewatering from the holeless inner tank, a plurality of dewatering holes are provided in the side wall of the inner tank 17 in this embodiment. In addition, each dehydration hole is equipped with a centrifugal valve. The centrifugal valve is opened by centrifugal force during dewatering to perform dewatering and drainage.

The present embodiment further provides a method for controlling the drum washing machine. The washing machine executes a washing/rinsing program, and during the water supply process, the flow rate sensor detects the water supply flow rate value in real time. The washing machine calculates the water supply amount based on the water supply flow rate value and the water supply time, and stops the water supply when the water supply amount reaches a predetermined water supply amount of the washing machine.

A plurality of water supply flow rate values that can be selected by the user are set in the drum washing machine, and the washing machine supplies water based on the water supply flow rate value selected by the user.

The drum washing machine has a clothes weighing function, specifies the water supply flow rate value based on the weight of the clothes, and supplies water.

As shown in FIGS. 2 to 4, the drum washing machine of this embodiment includes an inner tub 17 and a water supply pipe. The inner tank is a holeless inner tank in which washing water is stored when washing clothes. Moreover, it further includes a water metering device for measuring the amount of water supplied. The water supply pipe is in communication with a water metering device, and the water metering device is in communication with the inner tank.

The drum washing machine of this embodiment is equipped with a water metering device, and before water is supplied to the inner tank 1, the water enters the water metering device and performs quantitative measurement. Furthermore, the number of times of water dispensing by the water dispensing device is determined based on the predetermined water level. As a result, the problem of water supply based on a predetermined water level of a drum washing machine having a non-perforated inner tank is solved, and the cleaning effect is ensured. Furthermore, the structure is simple and control is easy.

Further, the water metering device of this embodiment includes a water metering tank 21. The water tank 21 has a water inlet and a water outlet. The water inlet communicates with the water supply pipe, and the water outlet communicates with the inner tank 17. Further, the water spout is provided with a water spout control device that controls the water spout to open when the amount of water in the water tank 21 reaches a predetermined value.

As an embodiment of the present example, as shown in FIG. 2, the metering water tank 21 is installed at the bottom of the inner tank 17. The water metering device includes a water level detection device 22 for detecting a metering water tank 21 . Further, the water discharge control device is a tank drainage pump 23. The tank drain pump 23 is activated when the water level detection device 22 detects that the water level in the metering water tank 21 has reached a predetermined value, and pushes out the water in the metering water tank 21 to the inner tank 17.

As an embodiment of the present example, as shown in FIG. 3, the metering water tank 21 is installed above the inner tank 17. The water metering device includes a water level detection device 22 for detecting a metering water tank. Further, the water discharge control device is a tank drain valve 25. The tank drain valve 25 is activated when the water level detection device 22 detects that the water level in the metering water tank 21 has reached a predetermined value, and discharges the water in the metering water tank 21 to the inner tank.

The water level detection device 22 in this embodiment is a liquid level sensor. The liquid level sensor includes a gas chamber and a sensor unit, the gas chamber communicating with a metering water tank. Alternatively, the water level detection device 22 includes a plurality of water level detection probes installed in the metering water tank and arranged in the depth direction.

In one embodiment of the present example, the metering water tank 21 is installed above the inner tank 17. The water spout is provided on the bottom wall of the metering water tank 21, and the water spout control device is a tank check valve that keeps the water spout closed at all times. When the amount of water in the water tank reaches a certain value, the tank check valve is opened by water pressure and gravity. Then, when the water in the metering water tank 21 is discharged into the inner tank 17, the tank check valve returns to its position and maintains the water outlet closed.

The metering water tank 21 in this embodiment is provided with an overflow hole 24. The overflow hole 24 is connected to an overflow pipe that leads out overflowing water from the metering water tank.

Preferably, the drum washing machine includes a drain line 8, said overflow line communicating with the drain line 8.

As an embodiment of the present example, as shown in FIG. 4, the water metering device includes a heating device 26 installed in the metering water tank 21, and a water temperature detection device that detects the water temperature in the metering water tank. .

The present embodiment further provides a method for controlling the drum washing machine. The washing machine runs a wash/rinse program. A washing machine controls washing water to enter a metering water tank, and stops water supply when the amount of water in the metering tank reaches a predetermined value. Then, after all the water in the metering water tank is discharged into the inner tank, the supply of water to the metering water tank is started again. This process is repeated until the water level in the inner tank reaches a predetermined value, and then water supply is terminated.

Further, the washing machine controls the washing water to enter the metering water tank, and stops water supply when the amount of water in the metering tank reaches a predetermined value. Then, the heating device is operated to heat the cleaning water, and when the water temperature detection device detects that the water temperature in the metering water tank has reached a predetermined value, all the water in the metering water tank is transferred to the inner tank. to be discharged.

This embodiment mainly solves the problem of how to ensure the balance of air pressure in a sealed chamber in a drum washing machine having an inner tub without holes. Specifically, if the solenoid valve suddenly loses water, especially if the water pipe network shuts off, negative pressure will be formed, causing the flushing water in the sealed room to flow back into the water pipe network, or gas inside. This solves the problem of water supply being difficult due to the presence of water.

As shown in FIGS. 5 to 7, the drum washing machine of this embodiment includes an inner tub 17. As shown in FIGS. The inner tank 17 is a holeless inner tank in which washing water is stored when washing clothes. It further includes an air pressure balance mechanism that balances the air pressure inside the inner tank by communicating the inner tank 17 with the external environment.

When water is supplied, the gas in the sealed chamber of the inner tank is under pressure and overflows from the balance mechanism, thereby ensuring the balance of atmospheric pressure.

In the event of a sudden water outage, outside air quickly enters the sealed chamber of the inner tank to prevent backflow and ensure air pressure balance. This prevents cleaning water from being sucked into the water pipe network.

In addition, the air pressure balance mechanism can ensure that the air pressure in the inner tank is balanced even during dehydration, for example.

As an embodiment of the present example, the atmospheric pressure balance mechanism includes an equal pressure hole 27 installed in the inner tank 17. One end of the equal pressure hole 27 that communicates with the inside of the inner tank 17 is provided at a position near the rotation center axis of the inner tank 17, and is always higher than the highest water level in the inner tank 17.

The drum washing machine of this embodiment includes a drive motor 16 and an inner tub shaft 13. The drive motor 16 is communicably connected to the inner tank 17 via the inner tank shaft 13, and rotates the inner tank 17. The equal pressure hole 27 is formed in the inner tank shaft 13 and communicates the inside of the inner tank 17 with the external environment. Further, the highest water level in the inner tank 17 is lower than the inner tank axis 13. Thereby, water in the inner tank can be prevented from flowing out from the isobaric hole.

The drum washing machine of this embodiment includes an outer tub 18. The inner tank 17 is installed inside the outer tank 18, and water discharged from the inner tank 17 is discharged via the outer tank 18. An inner tank door 6 for closing the inner tank is attached to the mouth of the inner tank 17, and the mouth of the outer tank 18 is open. One end of the equal pressure hole 27 communicates with the inside of the inner tank 17 , and the other end is provided inside the outer tank 18 and communicates with the outer tank 18 . This prevents extreme situations and allows water to be collected in the outer tank 18 even if it flows out of the hole.

Furthermore, an inner tank drainage hole is formed in the side wall of the inner tank 17 of this embodiment, and a normally closed check valve plug 11 is attached to the inner tank drainage hole. Further, a push-up rod mechanism 10 for pushing open the check valve plug 11 to drain water is attached to the outer tank 18.

Preferably, the outer tank 18 is further provided with a locking mechanism for locking the rotation of the inner tank. After the locking mechanism locks the inner tank, the push-up rod mechanism pushes open the check valve plug to drain water.

Further, the drum washing machine of this embodiment includes a water supply pipe. Further, the inner tank shaft 13 is provided with a hollow passage 14 that communicates with the inside of the inner tank 17 , and the water supply pipe communicates with the hollow passage 14 of the inner tank shaft 13 . The equal pressure hole 27 and the hollow passage 14 each communicate with the inside of the inner tank 17, and are spaced apart from each other. By doing this, the gas in the sealed chamber of the inner tank can be smoothly discharged to ensure the balance of atmospheric pressure inside the inner tank, and the situation where the water that has entered is directly discharged from the isobaric hole 27 and leaks can be avoided. Prevented.

Specifically, the hollow passage 27 extends from one end to the other end in the direction of the central axis of the inner tank shaft. Further, the equal pressure hole includes a first hole and a second hole. The first hole is installed parallel to the hollow path, and one end communicates with the inside of the inner tank. Moreover, one end of the second hole communicates with the first hole, and the other end extends to the outer circumferential wall of the inner tank shaft and communicates with the inside of the outer tank.

Preferably, the second hole and the first hole are vertically arranged to form an L-shaped equal pressure hole.

Furthermore, the inner tank shaft 13 is connected to a drive motor 16. The drive motor 16 includes a stator and a rotor, the rotor being fixedly connected to the inner tank shaft. A through hole is provided in the center of the rotor, and the water supply pipe passes through the through hole of the rotor and communicates with the hollow path of the inner tank shaft.

Preferably, a first dynamic seal structure is provided between the water supply pipe and the through hole of the rotor, and a second dynamic seal structure is provided between the through hole of the rotor and the hollow path of the inner tank shaft. It is being

In the drum washing machine described in this embodiment, a plurality of dewatering holes are provided in the side wall of the inner tub 17. In addition, each dehydration hole is equipped with a centrifugal valve. The centrifugal valve is opened by centrifugal force during dewatering to perform dewatering and drainage.

This embodiment mainly solves the problem of how to ensure the balance of air pressure in a sealed chamber in a drum washing machine having an inner tub without holes. Specifically, if the solenoid valve suddenly loses water, especially if the water pipe network shuts off, negative pressure will be formed, causing the flushing water in the sealed room to flow back into the water pipe network, or gas inside. This solves the problem of water supply being difficult due to the presence of water.

As shown in FIGS. 8 to 12, the drum washing machine of this embodiment includes an inner tub 17. As shown in FIGS. The inner tank 17 is a holeless inner tank in which washing water is stored when washing clothes. Moreover, it further includes a pressure increasing mechanism and/or a pressure reducing mechanism that balances the atmospheric pressure inside the inner tank 17 by communicating the inner tank with the external environment.

The pressure increase mechanism in this embodiment includes a pressure increase hole 28 and a negative pressure safety valve 29. The negative pressure safety valve 29 is installed in the pressure increase hole 28, and opens the pressure increase hole 28 in one direction when the internal pressure of the inner tank 17 is lower than the atmospheric pressure of the external environment. As a result, gas in the external environment enters the interior of the inner tank 17 through the pressure increase hole 28 and increases the pressure, and when the atmospheric pressure inside the inner tank 17 and the atmospheric pressure in the external environment are balanced, the negative pressure safety valve 29 is closed.

The pressure reduction mechanism in this embodiment includes a pressure reduction hole 30 and a positive pressure safety valve 31. The decompression hole 30 is provided at a position near the rotation center axis of the inner tank 17, and is always higher than the highest water level within the inner tank 17. The positive pressure safety valve 31 is installed in the pressure reduction hole 30, and opens the pressure reduction hole 30 in one direction to reduce the pressure when the internal pressure of the inner tank 17 is higher than the atmospheric pressure of the external environment. Then, when the atmospheric pressure inside the inner tank 17 and the atmospheric pressure in the external environment are balanced, the positive pressure safety valve 31 is closed.

As shown in FIG. 9, during water supply, the gas in the sealed chamber of the inner tank 17 is subjected to pressure. When the pressure exceeds a predetermined value of the positive pressure safety valve, the positive pressure safety valve is opened and gas overflows from the pressure reduction hole, thereby making it possible to ensure the balance of atmospheric pressure.

As shown in FIG. 10, when the water suddenly stops, the gas in the sealed chamber of the inner tank 17 is under pressure. When the pressure becomes smaller than a predetermined value of the positive pressure safety valve, outside air quickly enters the sealed chamber and prevents backflow. This ensures an air pressure balance and avoids the possibility that wash water will be sucked into the water pipe network.

In addition, the air pressure balance mechanism can ensure that the air pressure in the inner tank is balanced even during dehydration, for example.

The drum washing machine of this embodiment includes a drive motor 16 and an inner tub shaft 13. The drive motor 16 is communicably connected to the inner tank 17 via the inner tank shaft 13, and rotates the inner tank 17. The pressure increasing hole 28 and/or the pressure reducing hole 30 are formed in the inner tank shaft 13 to communicate the inside of the inner tank 17 with the external environment. Further, the highest water level in the inner tank 17 is lower than the inner tank axis 13.

The drum washing machine of this embodiment includes an outer tub 18. The inner tank 17 is installed inside the outer tank 18, and water discharged from the inner tank 17 is discharged via the outer tank 18. An inner tank door 6 for closing the inner tank is attached to the mouth of the inner tank 17, and the mouth of the outer tank 18 is open. One end of the pressure increasing hole 28 and/or the pressure reducing hole 30 communicates with the inside of the inner tank 17 , and the other end is provided inside the outer tank 18 and communicates with the outer tank 18 .

The drum washing machine of this embodiment includes a water supply pipe. The inner tank shaft 13 is provided with a hollow passage 14 that communicates with the inside of the inner tank 17 , and the water supply pipe communicates with the hollow passage 14 of the inner tank shaft 13 . The decompression hole 30 and the hollow path 14 each communicate with the inside of the inner tank 17, and are spaced apart from each other.

As shown in FIGS. 9 and 10, the hollow passage 14 extends in the direction of the central axis of the inner tank shaft 13 from one end to the other end. Further, the pressure reduction hole 30 includes a first hole portion and a second hole portion. The first hole is installed parallel to the hollow path, and one end communicates with the inside of the inner tank. Moreover, one end of the second hole communicates with the first hole, and the other end extends to the outer circumferential wall of the inner tank shaft and communicates with the inside of the outer tank.

Preferably, the second hole and the first hole are vertically arranged to form an L-shaped decompression hole.

The drum washing machine of this embodiment includes a water supply pipe. Further, the inner tank shaft 13 is provided with a hollow passage 14 that communicates with the inside of the inner tank 17, and the water supply pipe communicates with the hollow passage 14 of the inner tank shaft 13. The pressure increase hole 28 communicates with the hollow passage 14 .

Furthermore, the hollow passage 14 extends in the direction of the central axis of the inner tank shaft 13 from one end to the other end. Further, one end of the pressure increase hole 28 communicates with the hollow passage 14 , and the other end extends to the outer circumferential wall of the inner tank shaft 13 and communicates with the inside of the outer tank 18 .

Preferably, the pressure increase hole 28 is provided perpendicularly to the hollow passage 14.

The inner tank shaft of this embodiment is connected to a drive motor. The drive motor includes a stator and a rotor, the rotor being fixedly connected to the inner tank shaft. A through hole is provided in the center of the rotor, and the water supply pipe passes through the through hole of the rotor and communicates with the hollow path of the inner tank shaft.

Preferably, a first dynamic seal structure is provided between the water supply pipe and the through hole of the rotor, and a second dynamic seal structure is provided between the through hole of the rotor and the hollow path of the inner tank shaft. It is being

As shown in FIGS. 11 and 12, both the pressure increase hole 28 and the pressure reduction hole 30 are provided in the inner tank shaft 13. Moreover, all the openings communicating with the atmosphere are located inside the outer tank 18, and the openings communicating with the sealed chamber of the inner tank 17 are all located inside the water supply path 14 of the inner tank shaft 13.

Preferably, both the pressure increasing hole 28 and the pressure reducing hole 30 are provided in the inner tank shaft 13 so as to be easily associated. In addition, all openings communicating with the atmosphere are located inside the outer tank 18, and all openings communicating with the sealed chamber of the inner tank 17 are located inside the sealed chamber.

As shown in FIGS. 13 to 16, the drum washing machine of this embodiment includes an inner tub 17. As shown in FIGS. The inner tank 17 is a holeless inner tank in which washing water is stored when washing clothes. Moreover, it further includes a position detection device for detecting the position of the inner tank.

The drum washing machine of this embodiment includes a drive motor 16 and an inner tub shaft 13. The drive motor 16 includes a stator and a rotor, and the rotor is fixedly connected to the inner tank shaft 13 to rotate the inner tank 17 . The position detection device includes a position sensor 33 and a detected terminal 38. The detected terminal 38 is installed on the rotor, and the position sensor 33 is fixed at a position corresponding to the detected terminal 38.

The drum washing machine of this embodiment includes an outer tub 18. The position sensor 33 is installed on the side of the outer tank 18 closer to the drive motor 16. Moreover, the position sensor 33 and the detected terminal 38 are installed so as to correspond to each other with a gap between them.

In one embodiment of this example, the position sensor is an electromagnetic position sensor, or a photoelectric position sensor, or a differential voltage sensor, or an eddy current sensor, or a capacitance sensor, or a reed switch sensor, or a Hall sensor. .

The drum washing machine of this embodiment includes a locking mechanism 35 for locking the rotation of the inner tub. The position detection device detects whether or not the inner tank 17 is locked at a predetermined position after the lock mechanism 35 locks the inner tank 17 . And/or after the position detection device detects that the inner tank 17 has rotated to a predetermined position, the locking mechanism 35 locks the inner tank 17.

Further, the locking mechanism 35 is attached to a side wall of the outer tank 18 near the drive motor 16. The lock mechanism 35 includes a lock rod 40 that moves telescopically and a lock motor 41 that drives the lock rod 40 to move telescopically. Further, the rotor of the drive motor 16 is provided with a lock groove 39 that corresponds to and engages with the lock rod 40. When the lock rod 40 is driven by the lock motor 41 to extend and is inserted into the lock groove 39, the inner tank 17 is locked.

In the drum washing machine of this embodiment, an inner tank drain hole is provided in the side wall of the inner tank 17, and a normally closed check valve plug 11 is attached to the inner tank drain hole. Further, a push-up rod mechanism 10 for pushing open the check valve plug to drain water is attached to the outer tank. After the lock mechanism 35 locks the inner tank 17, the push-up rod mechanism 10 pushes open the check valve plug 11 to drain water.

Furthermore, the push-up rod mechanism is attached to the outer tank. The push-up rod mechanism includes a push-up rod that extends and contracts, and a push-up rod motor that drives the push-up rod to extend and contract. The push-up rod penetrates the tank wall of the outer tank and is inserted into the drain hole of the inner tank, and pushes open the check valve plug to drain the water.

The drum washing machine of this embodiment includes a main controller. The position detection sensor, lock motor, and push-up rod motor are all electrically connected to the main controller.

In the drum washing machine of this embodiment, a plurality of dewatering holes are provided in the side wall of the inner tub. In addition, each dehydration hole is equipped with a centrifugal valve. The centrifugal valve is opened by centrifugal force during dewatering to perform dewatering and drainage.

The washing machine of this embodiment has a position sensor 33. The position sensor 33 is installed in the outer tank 18 and the drive motor 16, and specifically, installed in the rear part of the outer tank 18 and the rotating rotor frame of the drive motor 16.

The position sensor 33 senses the position of the detected terminal 38 on the rotating rotor frame, converts it into a signal, and feeds it back to the main controller 4 of the washing machine through a circuit 43.

The position of the detected terminal 38 on the rotor frame corresponds to the position of the rotating inner tank.

The washing machine of this embodiment has a mounting frame 32. After the fixing member 34 is fixed to the outer tank, a lock motor, a lock rod, and a position sensor are attached to the attachment frame 32. Further, the rotor frame of the drive motor is provided with a lock groove and a detected terminal 38.

As shown in FIGS. 17 and 18, the drum washing machine of this embodiment includes an inner tub 17 and an outer tub 18. The inner tank 17 is a holeless inner tank in which washing water is stored when washing clothes. The outer tank 18 is coaxially installed outside the inner tank 17 and is used to collect water discharged from the inner tank 17 and discharge it via a drainage pipe. Furthermore, a position detection device provided in the outer tank 18 for detecting the position of the inner tank is further included.

Further, the position detection device includes a position sensor 37 and a detected terminal 38. The detected terminal 38 is installed in the inner tank 17. Further, the position sensor 37 is installed on the inner wall of the outer tank 18 and is provided so as to correspond to the detected terminal 38 of the inner tank 17 .

Preferably, the detected terminal 38 is installed on the side wall of the inner tank 17, and the position sensor 37 is installed on the inner wall of the outer tank 18. The circumference of the inner tank 17 in which the detected terminal 38 is located and the circumference of the outer tank 18 in which the position sensor 37 is located are arranged concentrically.

Preferably, the position sensor 37 is installed on the inner wall located at the upper part of the outer tank 18.

Preferably, the position sensor is an electromagnetic position sensor, or a photoelectric position sensor, or a differential voltage sensor, or an eddy current sensor, or a capacitance sensor, or a reed switch sensor, or a Hall sensor.

The drum washing machine of this embodiment includes a locking mechanism 35 for locking the rotation of the inner tub. The position detection device detects whether or not the inner tank 17 is locked at a predetermined position after the lock mechanism 35 locks the inner tank 17 . And/or after the position detection device detects that the inner tank 17 has rotated to a predetermined position, the locking mechanism 35 locks the inner tank.

Further, the locking mechanism 35 is attached to the outer tank 18. The lock mechanism 35 includes a lock rod that moves telescopically and a lock motor that drives the lock rod to move telescopically. Further, the inner tank 17 is provided with a lock groove 39 that corresponds to and engages with the lock rod. When the lock rod is driven by the lock motor to extend and is inserted into the lock groove 39, the inner tub 17 is locked.

As shown in FIG. 8, as an embodiment of the present example, the lock groove 39 is concealed by attaching a lifting rib 43 to the lock groove 39. Furthermore, or the terminal to be detected 38 is mounted inside the lifting rib 43.

As an embodiment of this embodiment, an inner tank drainage hole is formed in the side wall of the inner tank 17, and a normally closed check valve plug 11 is attached to the inner tank drainage hole. Further, a push-up rod mechanism 10 for pushing open the check valve plug 11 to drain water is attached to the outer tank 18. After the lock mechanism 35 locks the inner tank 17, the push-up rod mechanism 10 pushes open the check valve plug 11 to drain water.

Further, the push-up rod mechanism 10 is attached to an outer tank 18. The push-up rod mechanism 10 includes a push-up rod that extends and contracts, and a push-up rod motor that drives the push-up rod to extend and contract. The push-up rod penetrates the tank wall of the outer tank and is inserted into the drain hole of the inner tank, and pushes open the check valve plug to drain the water.

The drum washing machine of this embodiment includes a main controller 4. The position detection sensor, lock motor, and push-up rod motor are all electrically connected to the main controller.

In the drum washing machine of this embodiment, a plurality of dewatering holes are provided in the side wall of the inner tub. In addition, each dehydration hole is equipped with a centrifugal valve. The centrifugal valve is opened by centrifugal force during dewatering to perform dewatering and drainage.

In the drum washing machine control method, the drum washing machine includes an inner tub, a position detection device for detecting the position of the inner tub, and a locking mechanism for locking rotation of the inner tub. The inner tank is a holeless inner tank in which washing water is stored when washing clothes. In the control method, after the position detection device detects that the inner tank has rotated to a predetermined position, the locking mechanism is controlled to lock the inner tank. And/or after the locking mechanism locks the inner tub, the position detection device detects whether or not it is locked in a predetermined position.

As shown in FIG. 19, the washing machine includes a drive motor that drives the inner tub to rotate. In a washing or rinsing program, the washing machine controls the drive motor to slow down and executes an inner tub rotation stop program. As a result, when the position detection device detects that the inner tank has rotated to a predetermined position after the rotation speed of the inner tank has decreased to a predetermined safe rotation speed or less, the rotation of the drive motor is controlled to stop. The position of the inner tank is maintained so that it does not move, and drainage is performed by controlling the inner tank to be locked by a locking mechanism.

The washing machine includes a drive motor that drives an inner tub to rotate. In a washing or rinsing program, the washing machine controls the drive motor to slow down and executes an inner tub rotation stop program. Thereby, the locking mechanism is controlled to lock the inner tank after the rotational speed of the inner tank has decreased to a predetermined safe rotational speed or less. When the position detection device detects that the inner tank has rotated to a predetermined position, drainage is performed, and when it is not detected, drainage is not started.

In this embodiment, an inner tank drainage hole is formed in the side wall of the inner tank, and a normally closed check valve plug is attached to the inner tank drainage hole. Further, a push-up rod mechanism for pushing open the check valve plug to drain water is attached to the outer tank. In the drainage program, after the locking mechanism locks the inner tank, the push-up rod mechanism pushes open the check valve plug to perform drainage.

The washing machine of this embodiment includes a drive motor that drives the inner tub to rotate. In the dewatering program, the washing machine controls the drive motor to slow down and executes the inner tub rotation stop program. As a result, when the position detection device detects that the inner tank has rotated to a predetermined position after the rotation speed of the inner tank has decreased to a predetermined safe rotation speed or less, the rotation of the drive motor is controlled to stop. The position of the inner tank is maintained so that it does not move, and the inner tank is controlled to be locked by a locking mechanism. Then, end the dehydration program and unlock the door.

The washing machine of this embodiment includes a drive motor that drives the inner tub to rotate. In the dewatering program, the washing machine controls the drive motor to slow down and executes the inner tub rotation stop program. Thereby, the locking mechanism is controlled to lock the inner tank after the rotational speed of the inner tank has decreased to a predetermined safe rotational speed or less. Then, end the dehydration program and unlock the door. On the other hand, if the position detection device does not detect that the inner tank has rotated to a predetermined position, an alarm is issued.

The drum washing machine of this embodiment includes a drive motor and an inner tub shaft. The drive motor includes a stator and a rotor, the rotor being fixedly connected to the inner tank shaft to rotate the inner tank. Further, the position detection device includes a position sensor and a detected terminal. The detected terminal is installed on the rotor, and the position sensor is fixed at a position corresponding to the detected terminal.

If the rotor has rotated to a position where the detected terminal and the position sensor face each other, the inner tank has rotated to a predetermined position. And/or, after the locking mechanism locks the inner tank, if the rotor has rotated to a position where the detected terminal and the position sensor face each other, the inner tank is locked in a predetermined position.

The locking mechanism of this embodiment is attached to the side wall of the outer tank near the drive motor. The locking mechanism includes a lock rod that moves telescopically and a lock motor that drives the lock rod to move telescopically. Further, the rotor of the drive motor is provided with a lock groove that corresponds to and engages with the lock rod. The inner tub is locked when the lock rod is driven by the lock motor, extends, and is inserted into the lock groove.

The drum washing machine of this embodiment includes an outer tub. The outer tank is coaxially installed outside the inner tank and is used to collect water discharged from the inner tank and discharge it via a drain line. Further, the position detection device includes a position sensor and a detected terminal. The terminal to be detected is installed in the inner tank, and the position sensor is installed on the inner wall of the outer tank so as to correspond to the terminal to be detected in the inner tank.

If the rotor has rotated to a position where the detected terminal and the position sensor face each other, the inner tank has rotated to a predetermined position. And/or, after the locking mechanism locks the inner tank, if the rotor has rotated to a position where the detected terminal and the position sensor face each other, the inner tank is locked in a predetermined position.

The locking mechanism of this embodiment is attached to the outer tank. The locking mechanism includes a lock rod that moves telescopically and a lock motor that drives the lock rod to move telescopically. Further, the inner tank is provided with a lock groove that corresponds to and engages with the lock rod. The inner tub is locked when the lock rod is driven by the lock motor, extends, and is inserted into the lock groove.

As shown in FIGS. 20 to 22, the drum washing machine of this embodiment includes an inner tank 17, and washing water is stored in the inner tank 17 when washing clothes. The inner tank 17 has an inner tank opening, an inner tank bottom facing the inner tank opening, and an inner tank wall connected to surround the inner tank bottom to form an internal storage chamber. Further, the inner tank wall has an inner diameter enlarged portion 44/an inner diameter reduced portion 46. The inner diameter of the inner diameter enlarged portion 44/inner diameter reduced portion 46 gradually expands/reduces from the inner tank mouth toward the inner tank bottom. Further, a drainage device 45 is installed on the inner tank wall adjacent to the maximum inner diameter end of the inner diameter enlarged portion/inner diameter reduced portion.

The inner tub wall of the inner tub of the drum washing machine in this embodiment has an inner diameter enlarged portion 44/an inner diameter reduced portion 46. During drainage, the drainage device 45 is opened by centrifugal force as the inner tank rotates. Further, the centrifugal force component in the direction of the tank wall of the enlarged inner diameter portion 44/reduced inner diameter portion 46 causes the cleaning water in the inner tank to flow along the tank wall of the enlarged inner diameter portion 44/reduced inner diameter portion 46 to the maximum inner diameter end. It acts to discharge water from the drainage device 45 installed at the maximum inner diameter end of the inner diameter enlarged portion/inner diameter reduced portion. Therefore, the inner tank structure of the drum washing machine of the present application can effectively realize efficient dewatering and drainage using centrifugal force in the inner tank without holes and drainage method using centrifugal force. be.

As shown in FIGS. 20 and 21, in one embodiment of the present invention, the inner tank wall has an enlarged inner diameter portion 44 and a flat inner diameter portion. The inner diameter of the inner diameter flat straight portion is greater than or equal to the inner diameter of the largest end of the inner diameter enlarged portion 44. The inner diameter enlarged portion 44 gradually moves and expands from the inner tank mouth toward the inner tank bottom, and the inner diameter flat and straight portion is connected to the maximum inner diameter end of the inner diameter enlarged portion 44. Further, the drainage device 45 is installed at a flat and straight portion of the inner diameter. The enlarged inner diameter portion 44 of this embodiment is used to collect the cleaning water at the maximum inner diameter end. A flat and straight part of the inner diameter is connected and installed at the largest end of the inner diameter, and the collected water flow is focused on the part and discharged from the drainage device 45. Further, since the drainage device 45 is opened by centrifugal force, by installing it at a flat and straight portion of the inner diameter, the drainage device 45 is more effectively exposed to the action of centrifugal force and can be opened normally.

Further, the inner diameter flat and straight portion has a cylindrical cylindrical structure. One end of the inner diameter flat straight portion is connected to the maximum inner diameter end of the inner diameter enlarged portion 44, and the other end is connected to the outer periphery of the inner tank bottom in the circumferential direction. The drainage device 45 includes at least one drainage hole provided in the circumferential direction of the flat and straight portion of the inner diameter, and a centrifugal valve attached to the drainage hole to control opening/closing of the drainage hole.

As shown in FIG. 22, as another embodiment of this example, the inner tank wall has an inner diameter reduced portion 46 and an inner diameter flat portion. The inner diameter of the flat and straight inner diameter portion is greater than or equal to the inner diameter of the maximum end of the reduced inner diameter portion. The inner diameter reduced portion gradually moves and reduces from the inner tank mouth toward the inner tank bottom, and the inner diameter flat and straight portion is connected to the maximum inner diameter end of the inner diameter reduced portion. Further, the drainage device is installed at a flat and straight portion of the inner diameter. In this embodiment, the function and operation of the reduced inner diameter section 46 are similar to the enlarged inner diameter section 44, but only the flat and straight inner diameter section and the installation position of the drainage device are different.

Furthermore, the inner diameter flat and straight portion has a cylindrical structure. One end of the flat and straight part is connected to the largest end of the inner diameter of the reduced inner diameter part 46, and the other end is fitted with an inner tank sealing door that can be opened/closed. The drainage device includes at least one drainage hole provided in the circumferential direction of the flat and straight portion of the inner diameter, and a centrifugal valve attached to the drainage hole to control opening/closing of the drainage hole.

Regardless of whether an enlarged inner diameter section or a reduced inner diameter section is adopted, the axial length of the enlarged inner diameter section 44/reduced inner diameter section 46 is H, and the axial length of the flat straight section is h. Then, these become H≧h. Further, when the included angle between the side wall of the inner diameter enlarged portion/inner diameter reduced portion and the horizontal plane is A, the above A satisfies 0°≦A≦45°.

In one embodiment of this example, the inner diameter enlarged portion 44/inner diameter reduced portion 46 is molded integrally with the inner diameter flat and straight portion.

As shown in FIGS. 23 to 28, the drum washing machine of this embodiment includes an inner tank 17, and washing water is stored in the inner tank 17 when washing clothes. The inner tank 17 has an inner tank opening, an inner tank bottom facing the inner tank opening, and an inner tank wall connected to surround the inner tank bottom to form an internal storage chamber. Further, the inner tank wall has an inner diameter enlarged portion 44 and an inner diameter reduced portion 46. The inner diameter of the enlarged inner diameter portion 44 gradually increases from the inner tank mouth toward the inner tank bottom, and the inner diameter of the inner diameter reduced portion 46 gradually decreases from the inner tank mouth toward the inner tank bottom. Further, a drainage device 45 is installed on the inner tank wall in proximity to the maximum inner diameter ends of the inner diameter enlarged portion 44 and the inner diameter reduced portion 46, respectively.

The inner tub wall of the inner tub of the drum washing machine in this embodiment has an inner diameter enlarged portion 44 and an inner diameter reduced portion 46. During drainage, the drainage device 45 is opened by centrifugal force as the inner tank rotates. Further, the centrifugal force component in the direction of the tank wall of the enlarged inner diameter region 44 and the reduced inner diameter region 46 causes the cleaning water in the inner tank to move along the tank wall of the enlarged inner diameter region 44 and the reduced inner diameter region 46 to the maximum inner diameter end. It acts to discharge water from the drainage device 45 installed at the maximum inner diameter end of the inner diameter enlarged portion and the inner diameter reduced portion. Therefore, the inner tank structure of the drum washing machine of the present application can effectively realize efficient dewatering and drainage using centrifugal force in the inner tank without holes and drainage method using centrifugal force. be.

As shown in FIGS. 23 and 24, in one embodiment of the present example, the minimum inner diameter end of the enlarged inner diameter portion 44 is close to the inner tank opening, and the largest inner diameter end of the enlarged inner diameter portion 44 is located at the inner tank wall. It extends towards the center of the. Further, the smallest end of the inner diameter of the reduced inner diameter portion 46 is close to the bottom of the inner tank, and the largest end of the inner diameter of the reduced inner diameter portion 46 extends toward the center of the inner tank wall. This forms an inner tank with a small inner diameter at both ends and a larger inner diameter at the center. By doing so, during the drainage process, the water flow in the inner tank is collected from both ends to the center and discharged from the drainage device 45, which is more advantageous for efficient dewatering and drainage by centrifugal force.

Specifically, if the axial length of the inner diameter enlarged portion 44 is H1 and the axial length of the inner diameter reduced portion 46 is H2, then H1≧H2, and preferably H1=H2. .

When the included angle between the side wall of the inner diameter enlarged portion and the horizontal plane is A, and the included angle between the side wall of the inner diameter reduced portion and the horizontal plane is B, the above A and B satisfy 0°≦A≦B≦45°.

As shown in FIGS. 25 and 26, as an embodiment of the present example, the drum washing machine includes an inner diameter flat and straight portion 47. As shown in FIGS. The flat and straight inner diameter portion 47 is located at the center of the inner tank, and both ends thereof are connected to the maximum inner diameter end of the enlarged inner diameter portion 44 and the largest inner diameter end of the reduced inner diameter portion 46, respectively. Further, a drainage device 45 is installed in the flat and straight portion 47 of the inner diameter. In this way, by installing the drainage device that opens using centrifugal force in the flat and straight portion 47 of the inner diameter, the drainage device receives centrifugal force when the inner tank rotates and is reliably opened, thereby increasing the efficiency of drainage. gender is guaranteed.

Specifically, if the axial length of the enlarged inner diameter portion 44 is H1, the axial length of the reduced inner diameter portion 46 is H2, and the axial length of the flat inner diameter portion is H3, then H1≧ H2≧H3, preferably H1=H2>H3.

Let A be the included angle between the side wall of the inner diameter enlarged portion and the horizontal plane, and B be the included angle between the side wall of the inner diameter reduced portion and the horizontal plane. Further, the inner diameter flat and straight portion has a cylindrical cylindrical structure, and the included angle between the inner diameter flat and straight portion and the horizontal plane is C. In this case, A, B, and C satisfy 0°≦A≦B≦45° and C=0°.

As shown in FIGS. 27 and 28, this embodiment is basically the same as the embodiment shown in FIGS. 25 and 26, but H1<H3 and H2<H3. Only the points are different.

As a further embodiment of the present example, the maximum internal diameter end of the reduced internal diameter section 46 is close to the inner tank opening, and the minimum internal diameter end of the reduced internal diameter section 46 extends toward the center of the inner tank wall. There is. Further, the maximum inner diameter end of the enlarged inner diameter portion 44 is close to the bottom of the inner tank, and the smallest end of the inner diameter of the enlarged inner diameter portion 44 extends toward the center of the inner tank wall. This forms an inner tank having a large inner diameter at both ends and a smaller inner diameter at the center. Further, a first drainage device is installed near the maximum inner diameter end of the inner diameter enlarged portion on the inner tank wall, and a second drainage device is installed near the inner diameter maximum end of the inner diameter reduced portion on the inner tank wall. . In this embodiment, an inner tank having a large inner diameter and a small inner diameter at the center is provided. During drainage, the water in the inner tank collects at both ends and is discharged from the drainage device, so that it also has better efficient dewatering performance and drainage performance due to centrifugal force.

Specifically, if the axial length of the reduced inner diameter portion 46 is H4 and the axial length of the enlarged inner diameter portion 44 is H5, then H4≧H5, and preferably H4=H5. .

If the included angle between the side wall of the reduced inner diameter portion 46 and the horizontal plane is D, and the included angle between the side wall of the enlarged inner diameter portion 44 and the horizontal plane is E, then D and E satisfy 0°≦D≦E≦45°.

Furthermore, the drum washing machine includes a first flat and straight inner diameter section and a second flat and straight inner diameter section. The first flat and straight inner diameter portion is connected to the largest end of the inner diameter of the reduced inner diameter portion, and the second flat and straight portion of the inner diameter is connected to the largest end of the inner diameter of the enlarged inner diameter portion. The first drainage device is installed at the first flat and straight portion of the inner diameter, and the second drainage device is installed at the second flat and straight portion of the inside diameter.

Specifically, the length in the axial direction of the reduced inner diameter portion is H4, the length in the axial direction of the enlarged inner diameter portion is H5, the length in the axial direction of the first flat straight portion is H6, and the length of the second flat straight portion is H4. If the axial length of the part is H7, then H4≧H5≧H6=H7, and preferably H4=H5>H6=H7.

Let D be the included angle between the side wall of the inner diameter reduced portion and the horizontal plane, and E be the included angle between the side wall of the inner diameter enlarged portion and the horizontal plane. Further, both the first inner diameter flat and straight portion and the second inner diameter flat and straight portion have a cylindrical structure. Furthermore, let F be the included angle between the first flat and straight inner diameter portion and the horizontal plane, and let G be the included angle between the second flat and straight inner diameter portion and the horizontal plane. In this case, D, E, F, and G satisfy 0°≦D≦E≦45°, and F, G=0°.

As shown in FIGS. 29 to 32, the drum washing machine of this embodiment includes an inner tank 17, and washing water is stored in the inner tank 17 when washing clothes. The inner tank 17 is provided with a plurality of annular water collection grooves along the circumferential direction of the inner wall and an axial water collection groove 50 that penetrates and communicates with the annular water collection grooves (48, 49) in the axial direction. Further, a drainage device 45 is installed within the annular water collection groove (48, 49).

The inner wall of the inner tub of the drum washing machine in this embodiment is equipped with annular water collection grooves (48, 49), and N peaks and valleys are formed on the wall of the inner tub, so water is discharged by centrifugal force. The collected water can be collected in each annular water collection groove (48, 49). Further, the inner wall of the inner tank is provided with an axial groove structure, and the axial grooves realize communication between the respective annular water collection grooves (48, 49). As a result, the water in each annular water collection groove (48, 49) can be collected more quickly and easily before being discharged from the drainage device, achieving efficient drainage and dewatering/drainage. .

As an embodiment of the present example, the annular water collection groove includes a plurality of first annular water collection grooves 48 and at least one second annular water collection groove 49, and the first annular water collection groove 48, the second annular water collection groove The annular water collection grooves 49 communicate with each other through an axial water collection groove 50. The groove width in the second annular water collection groove 49 is larger than the groove width in the first annular water collection groove 48, and the drainage device 45 is installed in the second water collection groove.

In this embodiment, the inner wall of the inner tank is provided with a first annular water collection groove 48, and N peaks and valleys are formed on the wall surface of the inner tank. It becomes possible to collect water in the annular water collecting groove 48.

Since the inner wall of the inner tank is provided with the second annular water collecting groove 49, it is convenient for collecting all the water collected by centrifugal force. Moreover, it has a pore structure. The pore structure is sealed with a centrifugal valve and can only be opened when subjected to centrifugal force at a constant rotational speed.

An axial water collection groove 50 is provided on the inner wall of the inner tank. The axial water collection groove 50 realizes communication between the first annular water collection groove 48 and the second annular water collection groove 49, and allows water in each first annular water collection groove 48 to be more quickly and easily transferred to the second annular water collection groove. The water collects in the water collection groove 49 and can be discharged from the hole structure of the second annular water collection groove 49. This achieves efficient dewatering and drainage.

In one embodiment of this embodiment, the inner tank 17 has a cylindrical structure with a constant inner diameter. The inner tank 17 has an inner tank opening, an inner tank bottom facing the inner tank opening, and an inner tank wall connected to surround the inner tank bottom to form an internal storage chamber. One second annular water collection groove 49 is provided in the center of the inner tank wall, and between the inner tank mouth and the second annular water collection groove 49 inside the inner tank wall, and between the inner tank bottom and the second annular water collection groove 49. A plurality of first annular water collecting grooves 48 are sequentially provided between the annular water collecting grooves 49 along the axial direction.

Preferably, a plurality of axial water collection grooves 50 are uniformly installed along the circumferential direction of the inner tank wall, and each of the axial water collection grooves 50 penetrates the second annular water collection groove 49 and the first annular water collection groove 48. communicate.

Furthermore, if the axial length between the second annular water collecting groove 49 and the inner tank mouth is L1, and the axial length between the second annular water collecting groove 49 and the inner tank bottom is L2, then L1 and L2 satisfy L1≧L2.

Embodiment 10 can be combined with Embodiments 8 and 9 to form a new technical solution.

The drum washing machine described in this embodiment has an annular water collection groove along the circumferential direction of the inner wall and an annular water collection groove in the axial direction in the inner diameter enlarged part/reduced inner diameter part and/or inner diameter flat part of the inner tub. An axial water collection groove is provided that communicates through the water.

Further, a plurality of first annular water collecting grooves and a second annular water collecting groove provided at the maximum inner diameter end are sequentially installed in the axial direction on the inner wall of the inner diameter enlarged portion/inner diameter reduced portion. Further, the axial water collecting groove sequentially penetrates the first annular water collecting groove and the second annular water collecting groove to communicate with each other. Further, the drainage device is installed within the second annular water collection groove.

Preferably, the groove width in the second annular water collection groove is larger than the groove width in the first annular water collection groove.

Furthermore, a plurality of first annular water collecting grooves are sequentially provided in the inner wall of the inner diameter enlarged portion/inner diameter reduced portion along the axial direction, and at least one third annular water collecting groove is provided in the inner wall of the inner diameter flat portion. A water collection ditch is provided. Further, the axial water collecting groove sequentially penetrates the first annular water collecting groove and the third annular water collecting groove to communicate with each other.

Preferably, the groove width in the third annular water collection groove is larger than the groove width in the first annular water collection groove.

Furthermore, the inner tank wall has an inner diameter enlarged portion/inner diameter reduced portion. The inner diameter of the inner diameter enlarged portion/inner diameter reduced portion gradually expands/reduces from the inner tank mouth toward the inner tank bottom. A plurality of first annular water collecting grooves and a second annular water collecting groove provided at the maximum inner diameter end are sequentially installed in the axial direction on the inner wall of the inner diameter enlarged portion/inner diameter reduced portion. Further, the axial water collecting groove sequentially penetrates the first annular water collecting groove and the second annular water collecting groove to communicate with each other. A groove width in the second annular water collection groove is larger than a groove width in the first annular water collection groove. Further, the drainage device is installed within the second annular water collection groove.

Furthermore, the inner tank wall has a flat and straight portion. The inner diameter of the inner diameter flat straight portion is greater than or equal to the inner diameter of the maximum end of the inner diameter enlarged portion/inner diameter reduced portion. The inner diameter flat straight portion is connected to the maximum inner diameter end of the inner diameter enlarged portion/inner diameter reduced portion. Further, a plurality of first annular water collecting grooves are sequentially provided in the inner wall of the inner diameter enlarged portion/inner diameter reduced portion along the axial direction, and at least one second annular water collecting groove is provided in the inner wall of the inner diameter flat and straight portion. A water collection ditch is provided. A groove width in the second annular water collection groove is larger than a groove width in the first annular water collection groove. Further, the axial water collection groove sequentially penetrates the first annular water collection groove and the second annular water collection groove to communicate with each other.

Further, the inner tank wall has an enlarged inner diameter region and a reduced inner diameter region. The smallest end of the inner diameter of the enlarged inner diameter portion is close to the inner tank mouth, and the largest end of the inner diameter of the enlarged inner diameter portion extends toward the center of the inner tank wall. Further, the smallest end of the inner diameter of the reduced inner diameter portion is close to the bottom of the inner tank, and the largest end of the inner diameter of the reduced inner diameter portion extends toward the center of the inner tank wall. This forms an inner tank with a small inner diameter at both ends and a larger inner diameter at the center. Furthermore, a plurality of first annular water collection grooves are sequentially provided in the inner wall of the inner diameter enlarged portion and the inner diameter reduced portion along the axial direction. The second annular water collection groove is provided in the tank wall between the maximum inner diameter end of the enlarged inner diameter region and the largest inner diameter end of the reduced inner diameter region.

Further, the inner tank wall has an enlarged inner diameter region and a reduced inner diameter region. The maximum internal diameter end of the reduced internal diameter portion is close to the inner tank opening, and the minimum internal diameter end of the reduced internal diameter portion extends toward the center of the inner tank wall. Further, the maximum inner diameter end of the enlarged inner diameter portion is close to the bottom of the inner tank, and the smallest end of the inner diameter of the enlarged inner diameter portion extends toward the center of the inner tank wall. This forms an inner tank having a large inner diameter at both ends and a smaller inner diameter at the center. Furthermore, a plurality of first annular water collection grooves are sequentially provided in the inner wall of the inner diameter enlarged portion and the inner diameter reduced portion along the axial direction. The second annular water collecting groove is provided at the maximum inner diameter end of the enlarged inner diameter portion and the largest inner diameter end of the reduced inner diameter portion.

Furthermore, it includes a flat and straight portion of the inner diameter. The inner diameter flat straight portion is connected to the largest inner diameter end of the inner diameter enlarged portion and the inner diameter largest end of the inner diameter reduced portion. Further, the second annular water collecting groove is installed at a flat and straight portion of the inner diameter.

In the drum washing machine control method, the washing machine includes an inner tub, and washing water is stored in the inner tub when washing clothes. A drainage hole is provided in the side wall of the inner tank, and a centrifugal valve is attached to the drainage hole to control opening/closing of the drainage hole. As a control method, during the washing process of the washing machine, the rotational speed of the inner tub is controlled to be equal to or higher than a predetermined rotational speed N0, so that the centrifugal valve receives centrifugal force and opens the drain hole, thereby draining water from the inner tub. Perform drainage.

The drainage device of this embodiment employs a centrifugal valve. As a control method, centrifugal force is generated by controlling the rotation of the inner tank, and drainage is achieved by opening a centrifugal valve. In this way, the centrifugal valve + program control realizes drainage and dewatering of a drum washing machine with a holeless inner tank.

In one embodiment of this embodiment, after the washing machine completes execution of the washing program or the rinsing program, the rotational speed of the inner tub is controlled to become the first rotational speed N1 and maintained for a predetermined time t1. Said N1≧N0. Further, N0 is greater than the rotational speed of the inner bath in the cleaning program or the rinsing program. When the inner tank maintains the rotation speed N1 and reaches the rotation time t1, the inner tank is controlled to stop rotating and proceed to the next program. Preferably, N1 is 110 to 400 revolutions/min, more preferably 170±50 revolutions/min, even more preferably 150±20 revolutions/min. Preferably, the range of t1 is between 0.1 and 5 minutes, more preferably between 1 and 2 minutes.

Additionally, the washing machine includes a weighing device that measures the weight within the inner tub. The weighing device measures the weight W0 in the inner tank before the inner tank starts rotating at N1. Then, after the rotation time reaches t1, the weighing device detects the weight W1 in the inner tank, and the control system determines whether the drainage is normal or not based on a comparison between W1 and W0.

Furthermore, the control system determines whether or not the drainage is abnormal by comparing the value k of W1/W0. If k≧0.7, the control system determines that the drainage is abnormal and issues a warning; otherwise, the control system determines that the drainage is normal.

As a further embodiment of this example, after the washing machine completes execution of the washing program or the rinsing program, the rotational speed of the inner tub is controlled to be the first rotational speed N1. Said N1≧N0. Further, N0 is greater than the rotational speed of the inner bath in the cleaning program or the rinsing program. When the water in the inner tank has been drained, the rotation of the inner tank is stopped and the program proceeds to the next program.

Additionally, the washing machine includes a weighing device that measures the weight within the inner tub. In the process of controlling the washing machine to maintain the rotation of the inner tub at N1, the control system determines whether or not draining is completed based on the weight value in the inner tub detected in real time by the metering device. .

Further, when the control system determines whether drainage is completed based on the weight value in the inner tank detected in real time by the metering device, the following is included. That is, let the weight values in the inner tank detected in real time by the weighing device be W0, W1, W2, ..., Wt, and subtract the weight values at adjacent times to obtain n1 = W1 - W0, Record n2=W2-W1,..., nt=(Wt)-(Wt-1). Then, if nt does not change for a certain period of time and approaches 0, it is determined that the drainage is completed.

Furthermore, the control system compares the changes in n1, n2, . . . , nt and determines whether the drainage is normal or not. If n1=n2=...=nt=0, the control system determines that there is a drainage abnormality and issues a warning.

Additionally, the washing machine runs a spin program. The minimum dehydration rotation speed N2 in the dehydration program is equal to or higher than N0.

FIG. 33 shows a drum washing machine that employs the control method of this embodiment.

The above are only preferred embodiments of the invention and are not intended to limit the invention in any way. Although the present invention has been disclosed above in terms of preferred embodiments, it is not intended to limit the invention. Within the scope of the technical solution of the present invention, slight modifications or supplements that can be implemented by a person skilled in the art using the technical contents presented above are considered equivalent embodiments that are equally modified, and any such modifications or supplements are considered to be equivalent embodiments of the present invention. This does not deviate from the content of the technical plan. In addition, any simple modifications, equivalent variations, and supplements to the above embodiments based on the technical essence of the present invention all fall within the scope of the present invention.

Claims (18)

The inner tank includes an inner tank opening, an inner tank bottom opposite to the inner tank opening, and an inner tank connected to surround the inner tank bottom. In a drum washing machine having an inner tank wall forming a storage chamber,
The inner tank wall has an inner diameter enlarged part and an inner diameter reduced part, and the inner diameter of the inner diameter enlarged part gradually increases from the inner tank mouth toward the inner tank bottom, and the inner diameter of the inner diameter reduced part is It gradually shrinks from the tank mouth to the inner tank bottom.
The minimum inner diameter end of the inner diameter enlarged portion is close to the inner tank opening, the inner diameter largest end of the inner diameter enlarged portion extends toward the center of the inner tank wall, and the inner diameter minimum end of the inner diameter reduced portion is close to the inner tank opening. The maximum inner diameter end of the reduced inner diameter section, which is close to the tank bottom, extends toward the center of the inner tank wall, thereby forming an inner tank with a small inner diameter at both ends and a large inner diameter at the center. Ori,
A drum washing machine characterized in that a drainage device is installed near the maximum end of the inner diameter of the inner diameter enlarged portion and/or the inner diameter reduced portion of the inner tank wall. If the axial length of the inner diameter enlarged portion is H1, and the axial length of the inner diameter reduced portion is H2, then H1≧H2, preferably H1=H2, and the side wall of the inner diameter enlarged portion and a horizontal plane is A, and when the included angle between the side wall of the inner diameter reduced portion and the horizontal plane is B, the A and B satisfy 0°≦A≦B≦45°, according to claim 1. drum washing machine. The flat and straight part of the inner diameter is located in the center of the inner tank, and both ends are connected to the maximum inner diameter end of the enlarged inner diameter part and the largest inner diameter end of the reduced inner diameter part. The drum washing machine according to claim 1 or 2, characterized in that a drainage device is installed at the direct portion. Assuming that the axial length of the inner diameter enlarged portion is H1, the axial length of the inner diameter reduced portion is H2, and the axial length of the inner diameter flat straight portion is H3,
These are H1≧H2≧H3, preferably these are H1=H2>H3,
Or these become H1<H3, H2<H3,
The included angle between the side wall of the inner diameter enlarged part and the horizontal plane is A, and the included angle between the side wall of the inner diameter reduced part and the horizontal plane is B, and the inner diameter flat and straight part has a cylindrical cylindrical structure, and the inner diameter is flat and straight. The drum washing machine according to claim 3, wherein A, B, and C satisfy 0°≦A≦B≦45°, and C=0°, where C is an included angle between the part and a horizontal plane. The maximum internal diameter end of the reduced internal diameter portion is close to the inner tank opening, the minimum internal diameter end of the reduced internal diameter portion extends toward the center of the inner tank wall, and the maximum internal diameter end of the expanded internal diameter portion is close to the inner tank opening. The smallest inner diameter end of the enlarged inner diameter portion, which is close to the tank bottom, extends toward the center of the inner tank wall, thereby forming an inner tank with a large inner diameter at both ends and a small inner diameter at the center. A first drainage device is installed near the maximum inner diameter end of the inner diameter enlarged portion on the inner tank wall, and a second drainage device is installed near the inner diameter maximum end of the inner diameter reduced portion on the inner tank wall. The drum washing machine according to claim 1, characterized in that: If the axial length of the inner diameter reduced portion is H4 and the axial length of the inner diameter enlarged portion is H5, then H4≧H5,
If the included angle between the side wall of the inner diameter reduced portion and the horizontal plane is D, and the included angle between the side wall of the inner diameter enlarged portion and the horizontal plane is E, then D and E satisfy 0°≦D≦E≦45°. The drum washing machine according to claim 5. The inner tank wall includes a first inner diameter flat straight portion and a second inner diameter flat straight portion, the first inner diameter flat straight portion is connected to the maximum inner diameter end of the inner diameter reduced portion, and the second inner diameter flat straight portion is connected to the inner diameter maximum end of the inner diameter reduced portion. 12. The first drainage device is connected to the largest inner diameter end of the enlarged portion, and the first drainage device is installed at the first flat and straight portion, and the second drainage device is installed at the second flat and straight portion. 5. The drum washing machine according to 5. The axial length of the inner diameter reduced portion is H4, the axial length of the inner diameter enlarged portion is H5, the axial length of the first inner diameter flat and straight portion is H6, and the axial length of the second inner diameter flat and straight portion is H4. If the length is H7, these are H4≧H5≧H6=H7,
The included angle between the side wall of the inner diameter reduced portion and the horizontal plane is D, the included angle between the side wall of the inner diameter enlarged portion and the horizontal plane is E, and both the first inner diameter flat and straight portion and the second inner diameter flat and straight portion have a cylindrical structure. If the included angle between the first flat and straight part of the inner diameter and the horizontal plane is F, and the included angle between the second flat and straight part of the inner diameter and the horizontal plane is G, then D, E, F, and G are 0°≦D≦E. The drum washing machine according to claim 7, characterized in that ≦45° and F, G=0° are satisfied. The inner tank wall has an inner diameter enlarged portion and an inner diameter flat/straight portion, and the inner diameter of the inner diameter enlarged portion is greater than or equal to the inner diameter of the maximum end of the inner diameter enlarged portion, and the inner diameter enlarged portion is connected from the inner tank mouth. The inner diameter gradually moves and expands toward the bottom of the inner tank, and the inner diameter flat and straight part is connected to the largest end of the inner diameter of the inner diameter enlarged part, and the drainage device is installed in the inner diameter flat and straight part. The drum washing machine according to claim 1. The inner diameter flat straight part has a cylindrical cylindrical structure, one end of the inner diameter flat straight part is connected to the maximum inner diameter end of the inner diameter enlarged part, and the other end is connected to the outer periphery of the inner tank bottom in the circumferential direction. The drainage device is characterized in that it includes at least one drainage hole provided in the circumferential direction of the flat and straight portion of the inner diameter, and a centrifugal valve attached to the drainage hole to control opening/closing of the drainage hole. The drum washing machine according to claim 9. The inner tank wall has an inner diameter reduced portion and an inner diameter flat/straight portion, and the inner diameter of the inner diameter reduced portion is greater than or equal to the inner diameter of the maximum end of the inner diameter reduced portion, and the inner diameter reduced portion extends from the inner tank mouth. The inner diameter is gradually shifted and reduced toward the bottom of the inner tank, and the inner diameter flat and straight portion is connected to the maximum inner diameter end of the inner diameter reduced portion, and the drainage device is installed at the inner diameter flat and straight portion. The drum washing machine according to claim 1. The flat and straight inner diameter portion has a cylindrical structure, one end of the flat and straight inner diameter portion is connected to the maximum inner diameter end of the reduced inner diameter portion, and an inner tank sealing door that can be opened/closed is attached to the other end. The drainage device is characterized in that it includes at least one drainage hole provided in the circumferential direction of the flat and straight portion of the inner diameter, and a centrifugal valve attached to the drainage hole to control opening/closing of the drainage hole. The drum washing machine according to claim 11. If the axial length of the inner diameter enlarged portion/inner diameter reduced portion is H, and the axial length of the inner diameter flat straight portion is h, then H≧h, and the side wall of the inner diameter enlarged portion/inner diameter reduced portion is The drum washing machine according to claim 9, wherein A is an included angle with a horizontal plane, and A satisfies 0°≦A≦45°. An annular water collection groove along the circumferential direction of the inner wall and an axial water collection groove that penetrates and communicates with the annular water collection groove in the axial direction are provided in the inner diameter enlarged part/inner diameter reduced part and/or the inner diameter flat and straight part. The drum washing machine according to any one of claims 1 to 13, characterized in that: A plurality of first annular water collecting grooves and a second annular water collecting groove provided at the maximum end of the inner diameter are installed in order along the axial direction on the inner wall of the inner diameter enlarged portion/inner diameter reduced portion. Claim 14, wherein the water collection groove sequentially penetrates and communicates the first annular water collection groove and the second annular water collection groove, and the drainage device is installed within the second annular water collection groove. Drum washing machine described in. The drum washing machine according to claim 15, wherein a width of the second annular water collection groove is larger than a width of the first annular water collection groove. A plurality of first annular water collecting grooves are sequentially provided in the inner wall of the inner diameter enlarged portion/inner diameter reduced portion along the axial direction, and at least one third annular water collecting groove is provided in the inner wall of the inner diameter flat and straight portion. The drum washing machine according to claim 14, wherein a groove is provided, and the axial water collection groove passes through the first annular water collection groove and the third annular water collection groove in order to communicate with each other. A method for controlling a drum washing machine according to any one of claims 1 to 17,
The washing machine includes an inner tank, washing water is stored in the inner tank when washing clothes, and a drainage hole is provided in the side wall of the inner tank, and a drainage hole is provided in the drainage hole to control opening/closing of the drainage hole. In the control method of a drum washing machine, the drainage device is a centrifugal valve.
During the washing process of the washing machine, by controlling the rotational speed of the inner tub to be equal to or higher than a predetermined rotational speed N0, the centrifugal valve receives centrifugal force to open the drain hole and drain water from the inner tub. Characteristic control method.