JP7266775B2 - drum washing machine - Google Patents

Description

TECHNICAL FIELD The present invention relates to the technical field of washing machines, and more particularly to a drum washing machine.

Washing machines are the most widely used home appliances in daily life, liberating people from the hassle of washing and bringing great convenience. However, washing machines also have certain drawbacks, such as the length of time required and the amount of water used. On the other hand, with the development of society, water resources are becoming more and more important as important natural resources. Along with this, people's awareness of water saving is increasing, and it is particularly important how to realize the water saving function of the washing machine.

In order to solve the problem of water saving in washing machines, patents such as Patent Document 1 have been filed up to now. Patent Literature 1 is a Chinese invention patent titled Drum Washing Machine. The invention relates to a drum washing machine including a housing, in which an inner tub and an outer tub are provided. A door seal is provided between the outer tank and the housing, and the inner tank is connected to a driving device. The inner tank is a non-perforated inner tank. In addition, the inner tank is a cone-shaped tank having a small diameter at the bottom and a large diameter at the mouth. The mouth portion of the inner tank contracts inward in an arc shape. Also, the door seal is provided with a water supply conduit. One end of the water supply conduit is connected to the washing water rapid heating device, and the other end of the water supply conduit penetrates the door seal and extends into the inner tank. The outer tank is provided with a drain port and a water pressure detector. As is clear from the above technical solution, the inner tank in the present invention is a non-perforated inner tank, and water is supplied to the inner tank by means of a water supply pipe installed in the door seal, and the shape of the inner tank itself is utilized. Drainage is realized in the dehydration process. By doing so, water accumulation between the inner tank and the outer tank is avoided, so that the amount of washing water is greatly reduced.

Although the above invention provides a drum washing machine having a non-perforated inner tub, it is merely a structure in which the inner tub of a conventional drum washing machine is designed to have a non-perforated structure, and is of little practical significance. This is because the clothes need to be immersed in a certain amount of washing water for washing, and the non-perforated inner tub must keep a certain amount of water in order to achieve the effect of immersion. Moreover, in this case, the load on the motor is increased, and problems such as power consumption are caused. In addition, the water supply system of the drum washing machine disclosed in Patent Document 1 allows the water to pass through the 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 the water supply conduit is installed in the door seal, the sealing effect of the door seal is likely to be hindered, making it difficult to achieve sealing. Moreover, in Patent Document 1, it is not possible to detect the water supply water level in the inner tank.

In addition, the present invention mainly solves the problem of how to ensure the air pressure balance in the sealed chamber in a drum washing machine with a non-perforated inner tub. Specifically, when the water supply to the solenoid valve is suddenly interrupted, especially when the water supply network is interrupted, a negative pressure is formed, causing the wash water in the sealed chamber to flow back into the water supply network. It solves the problem that water supply becomes difficult due to its existence.

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

Chinese Patent No. 201410215346.3

SUMMARY OF THE INVENTION To solve the above problems, an object of the present invention is to provide a drum washing machine. Specifically, the following technical solutions are used.

A drum washing machine includes an inner tub. The inner tub is a non-perforated inner tub that stores washing water when washing clothes. It also includes an air pressure balancing mechanism that balances the air pressure inside the inner tank by communicating the inner tank with the external environment.

Furthermore, the air pressure balance mechanism includes a constant pressure hole installed in the inner tank. One end of the equal pressure hole that communicates with the inside of the inner tank is provided at a position near the rotation center axis of the inner tank, and is always higher than the highest water level in the inner tank.

It also includes a drive motor and an inner tub shaft. The drive motor is communicatively connected to the inner tub via the inner tub shaft, and rotates the inner tub. The constant pressure hole is formed in the inner tub shaft to allow communication between the inside of the inner tub and the external environment. Also, the maximum water level in the inner tank is lower than the inner tank axis.

Further, the drum washing machine includes an outer tub. The inner tank is installed inside the outer tank, and the water discharged from the inner tank is discharged through the outer tank. An inner tank door is attached to the opening of the inner tank to close the inner tank, and the opening of the outer tank is open. One end of the equal pressure hole communicates with the inside of the inner tank, and the other end is provided inside the outer tank and communicates with the outer tank.

Further, an inner tank drain hole is formed in the side wall of the inner tank, and a normally closed check valve plug is attached to the inner tank drain hole. Further, the outer tank is equipped with a push-up rod mechanism for pushing open the check valve plug and draining the water.

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

Further, the drum washing machine includes a water supply line. A hollow passage communicating with the inside of the inner tub is provided in the inner tub shaft, and the water supply pipe communicates with the hollow passage of the inner tub shaft. The constant pressure hole and the hollow path communicate with the interior of the inner tank, respectively, and are spaced apart from each other.

Further, the hollow path extends from one end to the other end in the central axis direction of the inner tank shaft. Also, the constant pressure hole includes a first hole and a second hole. The first hole is installed parallel to the hollow passage, and one end communicates with the inside of the inner tank. One end of the second hole communicates with the first hole, and the other end extends to the outer peripheral 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 constant pressure hole.

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

Furthermore, 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. is provided.

Furthermore, a plurality of dewatering holes are formed in the side wall of the inner tank. A centrifugal valve is attached to each of the dewatering holes. The centrifugal valve is opened by centrifugal force during dehydration to perform dehydration and drainage.

The present invention provides a drum washing machine in which a non-perforated inner tub has a front-opening structure. The structure is simple and there is no need to fill the washing/rinsing water between the inner tub and the outer tub, which greatly reduces the washing water volume of the washing machine. Also, the risk of dirt adhering between the inner tub and the outer tub is avoided. At the same time, the user's health and user experience are greatly improved, and a huge amount of water resources are saved.

As one embodiment of the present invention, the air pressure balancing mechanism includes a pressure increasing mechanism and/or a pressure reducing mechanism that balances the air pressure inside the inner tank by communicating the inner tank with the external environment.

Further, the pressure boosting mechanism includes a pressure boosting hole and a negative pressure relief valve. The negative pressure safety valve is installed in the pressure increasing hole, and opens the pressure increasing hole in one direction when the pressure inside the inner tank is lower than the atmospheric pressure of the external environment. As a result, the gas in the external environment enters the inner tank through the pressure increasing hole to increase the pressure, and when the pressure inside the inner tank and the pressure in the external environment are balanced, the negative pressure relief valve is closed.

Further, the pressure reducing mechanism includes a pressure reducing hole and a positive pressure relief valve. The decompression hole is provided at a position near the rotation center axis in the inner tank, and is always higher than the highest water level in the inner tank. The positive pressure relief valve is installed in the decompression hole, and when the pressure inside the inner tank is higher than the atmospheric pressure of the external environment, the decompression hole is opened in one direction to reduce the pressure. When the air pressure inside the inner tank and the air pressure in the external environment are balanced, the positive pressure relief valve is closed.

Further, the drum washing machine includes a drive motor and an inner tub shaft. The drive motor is communicatively connected to the inner tub via the inner tub shaft, and rotates the inner tub. The pressure-increasing hole and/or the pressure-reducing hole are formed in the inner tank shaft to allow communication between the inside of the inner tank and the external environment. Also, the maximum water level in the inner tank is lower than the inner tank axis.

Further, the drum washing machine includes an outer tub. The inner tank is installed inside the outer tank, and the water discharged from the inner tank is discharged through the outer tank. An inner tank door is attached to the opening of the inner tank to close the inner tank, and the opening of the outer tank is open. One end of the pressure increasing hole and/or pressure reducing hole communicates with the inside of the inner tank, and the other end is provided inside the outer tank and communicates with the outer tank.

Further, the drum washing machine includes a water supply line. A hollow passage communicating with the inside of the inner tub is provided in the inner tub shaft, and the water supply pipe communicates with the hollow passage of the inner tub shaft. The decompression hole and the hollow path communicate with the interior of the inner tank, respectively, and are spaced apart from each other.

Further, the hollow path extends from one end to the other end in the central axis direction of the inner tank shaft. Also, the decompression hole includes a first hole and a second hole. The first hole is installed parallel to the hollow passage, and one end communicates with the inside of the inner tank. One end of the second hole communicates with the first hole, and the other end extends to the outer peripheral 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 installed to form an L-shaped decompression hole.

Further, the drum washing machine includes a water supply line. A hollow passage communicating with the inside of the inner tub is provided in the inner tub shaft, and the water supply pipe communicates with the hollow passage of the inner tub shaft. The pressure intensifying hole communicates with the hollow passage.

Further, the hollow path extends from one end to the other end in the central axis direction of the inner tank shaft. One end of the pressure increasing hole communicates with the hollow passage, and the other end extends to the outer peripheral wall of the inner tank shaft and communicates with the inside of the outer tank.

Preferably, the pressure intensifying hole is provided perpendicular to the hollow passage.

Furthermore, the inner tub shaft is connected to a drive motor. The drive motor includes a stator and a rotor, the rotor being fixedly connected to the inner tub shaft. A through hole is provided in the center of the rotor, and the water supply line 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 seal structure is provided between the through hole of the rotor and the hollow path of the inner tank shaft. It is

The present invention provides a drum washing machine in which a non-perforated inner tub has a front-opening structure. The structure is simple and there is no need to fill the washing/rinsing water between the inner tub and the outer tub, which greatly reduces the washing water volume of the washing machine. Also, the risk of dirt adhering between the inner tub and the outer tub is avoided. At the same time, the user's health and user experience are greatly improved, and a huge amount of water resources are saved.

In the drum washing machine of the present invention, when water is supplied, gas in the sealed chamber of the inner tub is pressurized and overflows from the balance mechanism, thereby ensuring air pressure balance. In addition, in the event of a sudden water outage, outside air quickly enters the sealed chamber of the inner tank to prevent backflow, ensuring air pressure equilibrium, thus avoiding the situation where washing water is sucked into the water pipe network. be done. In addition, the air pressure balance mechanism can ensure air pressure balance in the inner tank even during dehydration, for example.

In the drum washing machine of the present invention, the gas in the sealed chamber of the inner tub receives pressure when water is supplied. Then, when it exceeds a predetermined value of the positive pressure safety valve, the positive pressure safety valve is opened, and the gas overflows from the pressure reducing hole, so that the air pressure balance can be guaranteed. In addition, when the water supply is suddenly cut off, the gas in the sealed chamber of the inner tank receives pressure. Then, when the pressure drops below the predetermined value of the positive pressure safety valve, outside air quickly enters the sealed chamber to prevent backflow. This ensures an air pressure balance, thus avoiding washing water being sucked into the water pipe network. In addition, the air pressure balance mechanism can ensure air pressure balance in the inner tank even during dehydration, for example.

FIG. 1 is a principle diagram of a drum washing machine according to Embodiment 1 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 Embodiment 3 of the present invention. FIG. 6 is a partial enlarged view (depressurized state) of FIG. 5 of the drum washing machine in Embodiment 3 of the present invention. FIG. 7 is a partial enlarged view (in a pressurized state) of FIG. 5 of the drum washing machine in Embodiment 3 of the present invention. FIG. 8 is a principle diagram of a drum washing machine according to Embodiment 4 of the present invention. FIG. 9 is a partial enlarged view of FIG. 8 (depressurized state of Embodiment 1) of the drum washing machine in Embodiment 4 of the present invention. FIG. 10 is a partial enlarged view of FIG. 8 of the drum washing machine in Example 4 of the present invention (in the pressure increasing state of Embodiment 1). FIG. 11 is a partial enlarged view of FIG. 8 (depressurized state of Embodiment 2) of the drum washing machine in Embodiment 4 of the present invention. FIG. 12 is a partial enlarged view of FIG. 8 of the drum washing machine in Example 4 of the present invention (in a pressure-increased state of Embodiment 2). FIG. 13 is a principle diagram of a drum washing machine according to Embodiment 5 of the present invention. FIG. 14 is a bottom view of a drum washing machine according to Embodiment 5 of the present invention. FIG. 15 is a diagram showing a three-dimensional structure of a drum washing machine according to Embodiment 5 of the present invention. FIG. 16 is a partial enlarged view of FIG. 15 of the drum washing machine in Embodiment 5 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 flow chart of an embodiment of a drum washing machine control method according to Embodiment 7 of the present invention.

The drum washing machine according to the present invention will be described in detail below in combination with the drawings.

As shown in FIGS. 1 to 18, this embodiment provides a drum washing machine in which the non-perforated inner tub has a front-opening structure. The structure is simple and there is no need to fill the washing/rinsing water between the inner tub and the outer tub, which greatly reduces the washing water volume of the washing machine. Also, the risk of dirt adhering between the inner tub and the outer tub is avoided. At the same time, the user's health and user experience are greatly improved, and a huge amount of 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 coaxially installed in the outer tank 18 . The main purpose of the outer tank 18 is to collect the wastewater from the inner tank 17 and the wastewater from the high speed centrifugal dewatering of the inner tank 17 . When the inner tub 17 rotates (preferably, the lifting ribs 43 are installed), the clothes are continuously lifted and slammed to wash the clothes. The inner tank 17 has a holeless structure. Further, the outer tub 18 has a center mounting hole in which the bearing 12 is mounted and fixed. An inner tub shaft 13 firmly connected to the inner tub 17 is inserted through the bearing 12 and connected to a drive motor 16 . An inner tank door 6 that can be opened/closed is attached to the front part of the inner tank 17 to provide a sealed chamber structure for the inner tank 17 .

A 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 amount of water supply for a drum washing machine having a non-perforated inner tub. The specific measures are as follows.

The drum washing machine includes an inner tub 17 and a water supply line communicating with the inner tub 17 . The inner tub 17 is a non-perforated inner tub and stores wash water when washing clothes. A flow rate sensor 1 for detecting the flow rate of water supply is installed in the water supply pipeline.

In this embodiment, a flow rate sensor 1 is installed in the water supply pipeline 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, the flow rate sensor is used to solve the problem of water supply based on a predetermined water level in a drum washing machine having a non-perforated inner tub, so that the cleaning effect is ensured. Also, the structure is simple and the control is easy.

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

Preferably, the flow 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 main controller 4 are electrically connected through a circuit. The main controller 4 can collect the amount of water supply to the inner tank 17 in real time, and closes the water supply valve 20 when the amount of water supply reaches a predetermined amount.

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

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

In order to supply water to the non-perforated inner tub in this embodiment, the drum washing machine in this embodiment includes a driving motor 16 and an inner tub shaft 13 . The driving motor 16 is connected to the inner tub 17 via the inner tub shaft 13 so as to be able to transmit power, and rotates the inner tub 17 . A hollow passage 14 communicating with the inside of the inner tub 17 is provided in the inner tub shaft 13 , and the water supply pipe communicates with the hollow passage of the inner tub shaft 13 .

Specifically, the inner tub 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 tub 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 path 14 of the inner tank shaft 13 .

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

To achieve drainage from the imperforate inner tub, the drum washing machine of this embodiment includes an outer tub 18 . An inner tank drain 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 drain hole. Further, the outer tank 18 is equipped with a push-up rod mechanism 10 for pushing the check valve plug 11 open and draining the water.

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

A plurality of dewatering holes are formed in the side wall of the inner tank 17 in this embodiment in order to realize dehydration from the holeless inner tank. A centrifugal valve is attached to each of the dewatering holes. The centrifugal valve is opened by centrifugal force during dehydration to perform dehydration and drainage.

This embodiment further provides a control method for the drum washing machine. The washing machine executes the washing/rinsing program and detects the water supply flow rate value in real time with the flow sensor during the water supply process. 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 user-selectable water supply flow rate values 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 tub is a non-perforated inner tub that stores washing water when washing clothes. It also includes a water metering device for metering water supply. The water supply line communicates with a water metering device, and the water metering device communicates with the inner tank.

The drum washing machine of the present embodiment is equipped with a water metering device so that the water enters the water metering device before it is supplied to the inner tub 1 and performs quantitative measurement. Also, the number of times of water metering by the water metering device is determined based on the predetermined water level. This solves the problem of water supply based on a predetermined water level in a drum washing machine having a non-perforated inner tub, and secures the washing effect. Also, the structure is simple and the control is easy.

Furthermore, 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 pipeline, and the water outlet communicates with the inner tank 17 . Further, the water discharge port is provided with a water discharge control device for controlling the water discharge port to be opened when the amount of water in the water volume tank 21 reaches a predetermined value.

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

As an embodiment of this embodiment, the water tank 21 is installed above the inner tank 17 as shown in FIG. The water metering device includes a water level detection device 22 for detecting the water metering tank. Also, the water discharge control device is the 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 water metering tank 21 has reached a predetermined value, and discharges the water in the water metering 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, said gas chamber communicating with a volume tank. Alternatively, the water level detection device 22 includes a plurality of water level detection probes installed in the water tank and arranged in the depth direction.

As one embodiment of this embodiment, the water tank 21 is installed above the inner tank 17 . The water discharge port is provided on the bottom wall of the water metering tank 21, and the water discharge control device is a tank check valve that keeps the water discharge port 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. When the water in the metering water tank 21 is discharged to the inner tank 17, the tank check valve returns to its position to keep the water discharge port 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 line for discharging water overflowing from the metering water tank.

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

As an embodiment of this embodiment, as shown in FIG. 4, the water metering device includes a heating device 26 installed in the water metering tank 21 and a water temperature detection device for detecting the water temperature in the water metering tank. .

This embodiment further provides a control method for the drum washing machine. The washing machine runs a wash/rinse program. The washing machine controls washing water to flow into the water tank, and stops supplying water when the amount of water in the water tank reaches a predetermined value. After all the water in the water metering tank is discharged into the inner tank, the supply of water to the water metering tank is started again. In this manner, water supply is terminated repeatedly until the water level in the inner tank reaches a predetermined value.

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

This embodiment mainly solves the problem of how to ensure the air pressure balance in the sealed chamber in a drum washing machine with a non-perforated inner tub. Specifically, when the water supply to the solenoid valve is suddenly interrupted, especially when the water supply network is interrupted, a negative pressure is formed, causing the wash water in the sealed chamber to flow back into the water supply network. To solve the problem that water supply becomes difficult due to its existence.

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 tub 17 is a non-perforated inner tub that stores washing water when washing clothes. It also includes an air pressure balancing 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 pressurized and overflows from the balance mechanism to ensure the balance of air pressure.

In the event of sudden water cutoff, outside air can quickly enter the sealed chamber of the inner tank to prevent backflow and ensure air pressure balance. This avoids a situation in which wash water is sucked into the water pipe network.

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

As one embodiment of the present embodiment, the air pressure balance mechanism includes a constant pressure hole 27 installed in the inner tank 17 . One end of the constant pressure hole 27 communicating with the inside of the inner tank 17 is provided at a position near the rotation center axis of the inner tank 17 and 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 driving motor 16 is connected to the inner tub 17 via the inner tub shaft 13 so as to be able to transmit power, and rotates the inner tub 17 . The constant pressure hole 27 is formed in the inner tub shaft 13 to allow communication between the inside of the inner tub 17 and the external environment. Also, the maximum water level in the inner tank 17 is lower than the inner tank shaft 13 . As a result, it is possible to prevent the water in the inner tank from flowing out of the equal pressure 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 the water discharged from the inner tank 17 is discharged through the outer tank 18 . An inner tank door 6 is attached to the opening of the inner tank 17 to close the inner tank, and the opening 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 any water that escapes from the hole to be collected in the outer tub 18 .

Further, an inner tank drain 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 drain hole. Further, the outer tank 18 is equipped with a push-up rod mechanism 10 for pushing the check valve plug 11 open and draining the water.

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

Further, the drum washing machine of this embodiment includes a water supply line. A hollow path 14 communicating with the inside of the inner tank 17 is provided in the inner tank shaft 13 , and the water supply pipe communicates with the hollow path 14 of the inner tank shaft 13 . The constant pressure hole 27 and the hollow passage 14 communicate with the interior of the inner tank 17 and are spaced apart from each other. By doing so, it is possible to smoothly discharge the gas in the sealed chamber of the inner tank to ensure the equilibrium of the air pressure inside the inner tank, and the water that has entered is directly discharged from the equal pressure hole 27 and leaks. is also prevented.

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

Furthermore, the inner tub shaft 13 is connected to a drive motor 16 . The drive motor 16 includes a stator and rotor, the rotor being fixedly connected to the inner tub shaft. A through hole is provided in the center of the rotor, and the water supply line 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 seal structure is provided between the through hole of the rotor and the hollow path of the inner tank shaft. It is

The drum washing machine described in this embodiment has a plurality of dewatering holes formed in the side wall of the inner tub 17 . A centrifugal valve is attached to each of the dewatering holes. The centrifugal valve is opened by centrifugal force during dehydration to perform dehydration and drainage.

This embodiment mainly solves the problem of how to ensure the air pressure balance in the sealed chamber in a drum washing machine with a non-perforated inner tub. Specifically, when the water supply to the solenoid valve is suddenly interrupted, especially when the water supply network is interrupted, a negative pressure is formed, causing the wash water in the sealed chamber to flow back into the water supply network. To solve the problem that water supply becomes difficult due to its existence.

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 tub 17 is a non-perforated inner tub that stores washing water when washing clothes. It also includes a pressure increasing mechanism and/or a pressure reducing mechanism that balances the air pressure inside the inner tank 17 by communicating the inner tank with the outside environment.

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

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

As shown in FIG. 9, the gas in the sealed chamber of the inner tank 17 receives pressure when water is supplied. Then, when it exceeds a predetermined value of the positive pressure safety valve, the positive pressure safety valve is opened, and the gas overflows from the pressure reducing hole, so that the air pressure balance can be guaranteed.

As shown in FIG. 10, when the water supply is suddenly interrupted, the gas in the sealed chamber of the inner tank 17 is pressurized. Then, when the pressure drops below the predetermined value of the positive pressure safety valve, outside air quickly enters the sealed chamber to prevent backflow. This ensures an air pressure balance, thus avoiding washing water being sucked into the water pipe network.

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

The drum washing machine of this embodiment includes a drive motor 16 and an inner tub shaft 13 . The driving motor 16 is connected to the inner tub 17 via the inner tub shaft 13 so as to be able to transmit power, and rotates the inner tub 17 . The pressure increasing hole 28 and/or the pressure reducing hole 30 are formed in the inner tank shaft 13 to allow communication between the inside of the inner tank 17 and the external environment. Also, the maximum water level in the inner tank 17 is lower than the inner tank shaft 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 the water discharged from the inner tank 17 is discharged through the outer tank 18 . An inner tank door 6 is attached to the opening of the inner tank 17 to close the inner tank, and the opening 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 line. A hollow passage 14 communicating with the inside of the inner tub 17 is provided in the inner tub shaft 13 , and the water supply pipe communicates with the hollow passage 14 of the inner tub shaft 13 . The decompression hole 30 and the hollow passage 14 communicate with the interior of the inner tank 17 and are spaced apart from each other.

As shown in FIGS. 9 and 10, the hollow passage 14 extends from one end to the other end in the central axis direction of the inner tank shaft 13 . Also, the decompression hole 30 includes a first hole and a second hole. The first hole is installed parallel to the hollow passage, and one end communicates with the inside of the inner tank. One end of the second hole communicates with the first hole, and the other end extends to the outer peripheral 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 installed to form an L-shaped decompression hole.

The drum washing machine of this embodiment includes a water supply line. A hollow passage 14 communicating with the inside of the inner tub 17 is provided in the inner tub shaft 13 , and the water supply pipe communicates with the hollow passage 14 of the inner tub shaft 13 . The pressure intensifying hole 28 communicates with the hollow passage 14 .

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

Preferably, the pressure intensifying hole 28 is provided perpendicular to the hollow passage 14 .

The inner tub shaft in 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 tub shaft. A through hole is provided in the center of the rotor, and the water supply line 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 seal structure is provided between the through hole of the rotor and the hollow path of the inner tank shaft. It is

As shown in FIGS. 11 and 12 , both the pressure increasing hole 28 and the pressure reducing hole 30 are provided in the inner tank shaft 13 . 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 water supply path 14 of the inner tank shaft 13 .

As can be imagined, both the pressure increase hole 28 and the pressure reduction hole 30 are preferably provided in the inner tank shaft 13 . 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 tub 17 is a non-perforated inner tub that stores washing water 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 tub shaft 13 to rotate the inner tub 17 . The position detection device includes a position sensor 33 and a terminal 38 to be detected. The terminal to be detected 38 is installed on the rotor, and the position sensor 33 is fixed at a position corresponding to the terminal to be detected 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 tub 18 closer to the drive motor 16 . Further, the position sensor 33 and the terminal to be detected 38 are installed to correspond to each other with a space therebetween.

In one embodiment of this embodiment, 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 capacitive sensor, or a reed switch sensor, or a Hall sensor. .

The drum washing machine of this embodiment includes a lock mechanism 35 for locking 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 tub 17 has rotated to a predetermined position, the lock mechanism 35 locks the inner tub 17 .

Further, the lock mechanism 35 is attached to the side wall of the outer tub 18 near the drive motor 16 . The lock mechanism 35 includes a lock rod 40 that telescopes and a lock motor 41 that drives the lock rod 40 to telescope. Further, the rotor of the drive motor 16 is provided with a lock groove 39 that 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 tub 17 is locked.

In the drum washing machine of this embodiment, an inner tub drain hole is formed in the side wall of the inner tub 17, and a normally closed check valve plug 11 is attached to the inner tub drain hole. Further, the outer tub is equipped with a push-up rod mechanism 10 for pushing open the check valve plug and draining the water. 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 tub. The push-up rod mechanism includes a push-up rod that telescopes and a push-rod motor that drives the push-up rod to telescope. The push-up rod penetrates the tank wall of the outer tank and is inserted into the drain hole of the inner tank to push 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 formed in the side wall of the inner tub. A centrifugal valve is attached to each of the dewatering holes. The centrifugal valve is opened by centrifugal force during dehydration to perform dehydration and drainage.

The washing machine of this embodiment has a position sensor 33 . The position sensors 33 are installed on the outer tub 18 and the drive motor 16 , specifically, on the rear part of the outer tub 18 and on 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 the circuit 43 .

The position of the terminal to be detected 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, the mounting frame 32 is mounted with the lock motor, the lock rod and the position sensor. Further, the rotor frame of the drive motor is provided with lock grooves and terminals 38 to be detected.

As shown in FIGS. 17 and 18, the drum washing machine of this embodiment includes an inner tub 17 and an outer tub 18. As shown in FIGS. The inner tub 17 is a non-perforated inner tub that stores washing water when washing clothes. The outer tank 18 is coaxially installed outside the inner tank 17, and is used to collect the water discharged from the inner tank 17 and discharge it through the drain pipe. In addition, it further includes a position detection device provided in the outer tank 18 for detecting the position of the inner tank.

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

Preferably, the terminal to be detected 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 where the terminal 38 to be detected is positioned and the circumference of the outer tank 18 where the position sensor 37 is positioned are set concentrically.

Preferably, the position sensor 37 is installed on the inner wall positioned above the outer tub 18 .

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

The drum washing machine of this embodiment includes a lock mechanism 35 for locking 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 tub 17 has rotated to a predetermined position, the lock mechanism 35 locks the inner tub.

Further, the locking mechanism 35 is attached to the outer tub 18 . The lock mechanism 35 includes a lock rod that extends and retracts and a lock motor that drives the lock rod to extend and retract. Further, the inner tub 17 is provided with a lock groove 39 that engages with a 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 one embodiment of this embodiment, the lock groove 39 is concealed by attaching a lifting rib 43 to the lock groove 39 . Further alternatively, the terminal to be detected 38 is mounted inside the lifting rib 43 .

As one embodiment of the present embodiment, an inner tank drain 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 drain hole. Further, the outer tank 18 is equipped with a push-up rod mechanism 10 for pushing the check valve plug 11 open and draining the water. 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 the outer tub 18 . The push-up rod mechanism 10 includes a push-up rod that expands and contracts, and a push-rod motor that drives the push-up rod to expand 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 to push 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 formed in the side wall of the inner tub. A centrifugal valve is attached to each of the dewatering holes. The centrifugal valve is opened by centrifugal force during dehydration to perform dehydration 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 lock mechanism for locking the rotation of the inner tub. The inner tub is a non-perforated inner tub that stores washing water when washing clothes. In the control method, after the position detection device detects that the inner tank has rotated to a predetermined position, the lock mechanism is controlled to lock the inner tank. And/or after the locking mechanism locks the inner tub, the position detecting device detects whether or not it is locked at a predetermined position.

As shown in Figure 19, the washing machine includes a drive motor that drives the inner tub to rotate. In the washing or rinsing program, the washing machine controls the drive motor to decelerate 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 drive motor is controlled to stop rotating. The position of the inner tank is held so that it does not move, and the lock mechanism locks the inner tank to drain water.

The washing machine includes a drive motor that drives the inner tub to rotate. In the washing or rinsing program, the washing machine controls the drive motor to decelerate and executes the inner tub rotation stop program. As a result, after the rotation speed of the inner tub has decreased to a predetermined safe rotation speed or less, the lock mechanism is controlled to lock the inner tub. When the position detecting device detects that the inner tank has rotated to a predetermined position, the water is drained, and when it is not detected, the water is not drained.

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

The washing machine of this embodiment includes a drive motor that drives the inner tub to rotate. In the dehydration program, the washing machine controls the drive motor to decelerate 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 drive motor is controlled to stop rotating. The position of the inner tank is held so that it does not move, and the lock mechanism locks the inner tank. Then the dehydration program ends and the door is unlocked.

The washing machine of this embodiment includes a drive motor that drives the inner tub to rotate. In the dehydration program, the washing machine controls the drive motor to decelerate and executes the inner tub rotation stop program. As a result, after the rotation speed of the inner tub has decreased to a predetermined safe rotation speed or less, the lock mechanism is controlled to lock the inner tub. Then the dehydration program ends and the door is unlocked. On the other hand, if the position detecting device does not detect that the inner tank has rotated to the predetermined position, an alarm is issued.

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

When the rotor rotates to a position where the terminal to be detected and the position sensor face each other, the inner tank rotates to a predetermined position. And/or, after the lock mechanism locks the inner tub, the inner tub is locked at a predetermined position when the rotor rotates to a position where the terminal to be detected faces the position sensor.

The lock mechanism of this embodiment is attached to the side wall of the outer tub nearer to the drive motor. The lock mechanism includes a telescopic lock rod and a lock motor that drives the lock rod to extend and retract. Further, the rotor of the drive motor is provided with a lock groove that engages with the lock rod. The inner tank is locked when the lock rod is driven by the lock motor to extend 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 the water discharged from the inner tank and discharge it through the drain line. Also, the position detection device includes a position sensor and a terminal to be detected. 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 of the inner tank.

When the rotor rotates to a position where the terminal to be detected and the position sensor face each other, the inner tank rotates to a predetermined position. And/or, after the lock mechanism locks the inner tub, the inner tub is locked at a predetermined position when the rotor rotates to a position where the terminal to be detected faces the position sensor.

The lock mechanism of this embodiment is attached to the outer tub. The lock mechanism includes a telescopic lock rod and a lock motor that drives the lock rod to extend and retract. Further, the inner tank is provided with a lock groove that engages with the lock rod. The inner tank is locked when the lock rod is driven by the lock motor to extend and is inserted into the lock groove.

The foregoing are merely preferred embodiments of the invention and are not intended to limit the invention in any form. Although the present invention has been disclosed above through preferred embodiments, it is not intended to limit the present invention. Within the scope of the technical solution of the present invention, slight variations or supplements that can be implemented by those skilled in the art using the technical content presented above are regarded as equally modified equivalent embodiments, and any It does not deviate from the content of the technical plan. In addition, any simple modifications, equivalent variations and supplements added to the above embodiments based on the technical essence of the present invention are all within the scope of the scheme of the present invention.

Claims (17)

A drum washing machine comprising an inner tub, wherein the inner tub is a non-perforated inner tub for storing washing water when washing clothes,
further comprising an air pressure balance mechanism that balances the air pressure inside the inner tank by communicating the inner tank with the external environment;
The air pressure balance mechanism includes a constant pressure hole provided in the inner tank, and one end of the constant pressure hole that communicates with the inside of the inner tank is provided at a position near the rotation center axis of the inner tank. and a drum washing machine characterized in that the water level in the inner tub is always higher than the maximum water level. a drive motor and an inner tank shaft, wherein the drive motor is transmissively connected to the inner tank through the inner tank shaft to rotate the inner tank; and the constant pressure hole is formed in the inner tank shaft. 2. The drum washing machine according to claim 1, wherein the inside of the inner tub communicates with the outside environment, and the maximum water level in the inner tub is lower than the inner tub shaft. It includes an outer tank, the inner tank is installed inside the outer tank, the water discharged from the inner tank is discharged through the outer tank, and the inner tank is connected to the tank mouth of the inner tank. A closing inner tank door is attached, the outer tank has an open tank port, and the equal pressure hole has one end communicating with the inside of the inner tank and the other end communicating with the inside of the outer tank. 3. The drum washing machine according to claim 2, wherein the drum washing machine is provided and communicates with the outer tub. An inner tank drain hole is formed in the side wall of the inner tank, and a normally closed check valve plug is attached to the inner tank drain hole. 4. The drum washing machine according to claim 3, further comprising a push-up rod mechanism for draining water. The inner tank shaft includes a hollow path communicating with the interior of the inner tank, the water supply line communicating with the hollow path of the inner tank shaft, and the equal pressure 3. The drum washing machine as set forth in claim 2, wherein the hole and the hollow path communicate with the interior of the inner tub and are spaced apart from each other. The hollow path extends from one end to the other end in the direction of the central axis of the inner tank shaft, and the constant pressure hole includes a first hole and a second hole, the first hole being hollow. The second hole is installed parallel to the path and has one end communicating with the inside of the inner tank, and the second hole has one end communicating with the first hole and the other end extending to the outer peripheral wall of the inner tank shaft. It extends and communicates with the inside of the outer tank,
6. The drum washing machine as claimed in claim 5, wherein the second hole and the first hole are vertically installed to form an L-shaped constant pressure hole. A plurality of dehydration holes are formed in the side wall of the inner tank, and each of the dehydration holes is equipped with a centrifugal valve. 2. The drum washing machine according to claim 1, wherein water is discharged. A drum washing machine comprising an inner tub, wherein the inner tub is a non-perforated inner tub for storing washing water when washing clothes,
further comprising an air pressure balance mechanism that balances the air pressure inside the inner tank by communicating the inner tank with the external environment;
The atmospheric pressure balance mechanism includes a pressure increasing mechanism,
The pressure-increasing mechanism includes a pressure-increasing hole and a negative pressure safety valve, and the negative pressure safety valve is installed in the pressure-increasing hole, and the pressure inside the inner tank is lower than the atmospheric pressure of the external environment. The pressure increase hole is opened in one direction, and the gas in the external environment is allowed to enter the inner tank through the pressure increase hole to increase the pressure. When the pressure inside the inner tank and the pressure in the external environment are balanced, A drum washing machine, wherein the negative pressure safety valve is closed. The air pressure balance mechanism further includes a decompression mechanism,
The decompression mechanism includes a decompression hole and a positive pressure safety valve, and the decompression hole is provided at a position near the rotation center axis in the inner tank and is always higher than the maximum water level in the inner tank. The positive pressure safety valve is installed in the pressure reducing hole, and when the pressure inside the inner tank is higher than the atmospheric pressure of the external environment, the pressure reducing hole is opened in one direction to reduce the pressure of the inner tank. 9. The drum washing machine as claimed in claim 8, wherein the positive pressure relief valve is closed when the internal air pressure and the external air pressure are balanced. a drive motor and an inner tank shaft, the drive motor being transmissively connected to the inner tank via the inner tank shaft to rotate the inner tank; 10. The drum washing machine as set forth in claim 9, wherein an inner tub shaft is opened to allow communication between the inside of the inner tub and an external environment, and the maximum water level in the inner tub is lower than the inner tub shaft. machine. The inner tank is installed inside the outer tank, the water discharged from the inner tank is discharged through the outer tank, and the inner tank is connected to the inner tank at the mouth of the inner tank. An inner tank door is attached to close the tank, a tank mouth of the outer tank is open, and one end of the pressure increasing hole and/or the pressure reducing hole communicates with the inside of the inner tank, 11. The drum washing machine according to claim 10, wherein the other end is provided inside the outer tub and communicates with the outer tub. The inner tank shaft includes a hollow passage that communicates with the interior of the inner tank, the water supply pipe communicates with the hollow passage of the inner tank shaft, and the decompression hole. 11. The drum washing machine as set forth in claim 10, wherein the hollow passages communicate with the interior of the inner tub and are spaced apart from each other. The hollow path extends from one end to the other end in the direction of the central axis of the inner tank shaft, and the decompression hole includes a first hole and a second hole, and the first hole is hollow. One end of the second hole communicates with the first hole, and the other end communicates with the outer circumference of the inner tank shaft. It extends to the wall and communicates with the inside of the outer tank ,
13. The drum washing machine as set forth in claim 12, wherein the second hole and the first hole are vertically installed to form an L-shaped decompression hole. The inner tank shaft includes a hollow passage that communicates with the interior of the inner tank, the water supply pipe communicates with the hollow passage of the inner tank shaft, and the pressure intensifying hole. 11. The drum washing machine according to claim 10, wherein the is in communication with the hollow passage. The hollow passage extends from one end to the other end in the central axis direction of the inner tank shaft, and the pressure increasing hole has one end communicating with the hollow passage and the other end being the outer peripheral wall of the inner tank shaft. 15. The drum washing machine according to claim 14, wherein the drum washing machine extends to and communicates with the inside of the outer tub. The inner tub shaft is connected to a drive motor, the drive motor includes a stator and a rotor, the rotor is fixedly connected to the inner tub shaft, and a through hole is provided in the center of the rotor. 15. A drum washing machine according to any one of claims 5, 12 and 14, wherein said water supply pipe passes through a through hole of said rotor and communicates with a hollow passage of said inner tub shaft. . A first dynamic seal structure is provided between the water supply pipe and the through hole of the rotor, and a second seal structure is provided between the through hole of the rotor and the hollow path of the inner tank shaft. 17. The drum washing machine according to claim 16, characterized in that it is provided with.

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