JP6415858B2 - Washing machine - Google Patents

Description

  The present invention relates to a washing machine such as a drum type washing machine that performs washing in a horizontal axis type drum and a fully automatic washing machine that performs washing in a vertical axis type washing and dewatering tank.

  Conventionally, a circulation path is formed between the bottom of the outer tank and a discharge port provided in the outer tank, and a circulation pump is arranged in the circulation path, and water accumulated in the outer tank is discharged by the circulation pump. A drum type washing machine is known that supplies water to an outlet and drops the supplied water from a discharge port onto laundry in the drum (see Patent Document 1).

  On the other hand, a drum type washing machine is known in which a drainage pump is arranged in a drainage path from the outer tub, and water in the outer tub is forcibly discharged to the outside by the drainage pump (see Patent Document 2). .

JP 2010-036016 A JP 2010-268939 A

  Conventionally, it is difficult to install a circulation pump and a drainage pump due to restrictions due to manufacturing costs, installation space, etc., and the circulation of water into the outer tank and the forced drainage from the outer tank using the pump are difficult. It was difficult to achieve a washing machine that did both.

  This invention is made | formed in view of such a subject, The washing which can perform the circulation supply of the water in an outer tank, and the forced drainage from the inside of an outer tank using one pump. The purpose is to provide a machine.

  A washing machine according to a main aspect of the present invention includes an outer tub, a washing tub rotatably disposed in the outer tub, a pump provided at a position lower than the outer tub, a bottom of the outer tub, and the pump A first flow path through which water discharged from the outer tub and sucked into the pump flows, and a second flow path through which water discharged from the pump flows and connected to the pump outlet. A third flow path branched from the second flow path and extending upward, and provided in the outer tub and connected to the third flow path, and water flowing through the third flow path into the outer tub An outlet portion to be discharged, a drain valve provided in the second channel downstream of the branching point to the third channel, and closing or opening the second channel, the pump and the drain And a control unit for controlling the valve. Here, the control unit executes a first control process for closing the drain valve and operating the pump, and a second control process for opening the drain valve and operating the pump.

  According to the above configuration, when the pump operates with the drain valve closed, the water in the outer tub is sucked into the pump through the first channel, and the water discharged from the pump is the second channel. And it flows out into an outer tank from an outflow port part through a 3rd channel. That is, the water is circulated and supplied into the outer tank by the pump.

  On the other hand, when the pump operates with the drain valve opened, the water in the outer tub is sucked into the pump through the first flow path, and the water discharged from the pump passes through the second flow path and the drain valve. It is discharged outside the machine. That is, the water in the outer tub is forcibly discharged out of the machine by the pump. At this time, the water pressure generated in the third flow path is lowered by discharging the water in the second flow path to the outside of the apparatus, so that the water is not pumped up to the outlet part.

  Therefore, according to said structure, the circulation supply of the water to an outer tank and the forced drainage from the outer tank can be performed using one pump.

  In the washing machine according to this aspect, the diameter of the second flow path may be larger than the diameter of the third flow path.

  According to said structure, at the time of circulation of water, the water supply pressure in a 3rd flow path can be raised, and water is supplied between an outer tank, a 1st flow path, a 2nd flow path, and a 3rd flow path. While being able to circulate smoothly, at the time of drainage, the drainage flow volume by a 2nd flow path can be increased, and drainage performance can be improved.

  In the washing machine according to this aspect, in the second control process, the control unit opens the drain valve before operating the pump, and after a predetermined time has elapsed from the opening of the drain valve, the pump Can be configured to operate.

  According to the above configuration, since the pump operates after the water remaining in the third flow path is discharged by opening the drain valve, the third flow is generated when a low water supply pressure is generated in the third flow path. It is difficult for water to leak from the road into the outer tank.

  The washing machine which concerns on this aspect WHEREIN: The said washing machine is provided in the ozone generator which generate | occur | produces ozone, and the said 3rd flow path, The water which takes in the ozone which the said ozone generator generated, and flows through the said 3rd flow path And a gas-liquid mixer to be mixed. In this case, the controller may be configured to operate the ozone generator together with the pump in the first control process.

  According to said structure, the water containing ozone, ie, ozone water, can be produced | generated by mixing ozone with the water which flows through the inside of a 3rd flow path. Accordingly, ozone water can be circulated and supplied into the outer tub using a single pump, and water can be forcibly discharged from the outer tub to the outside of the apparatus. Therefore, when it is easy to wash, it can be sterilized with ozone water to improve the cleaning performance, and smooth drainage can be performed at the time of drainage to improve drainage performance.

  In the washing machine according to the present aspect, the outlet portion may have a configuration in which an outlet of water faces into the washing tub and sprays water from the outlet toward the washing tub.

  According to the above configuration, water can be circulated and supplied into the outer tub using one pump, and water can be poured onto the laundry from the outlet, and water is forcibly discharged from the outer tub. Can be made. Therefore, when it is easy to wash, the laundry can be sufficiently filled with water, so that the washing performance is improved, and at the time of drainage, smooth drainage can be performed, and the drainage performance is improved.

  ADVANTAGE OF THE INVENTION According to this invention, the washing machine which can perform the circulation supply of the water to an outer tank, and the forced drainage from the outer tank can be provided using one pump.

  The effects and significance of the present invention will become more apparent from the following description of embodiments. However, the following embodiment is merely an example when the present invention is implemented, and the present invention is not limited to what is described in the following embodiment.

It is side surface sectional drawing which shows the structure of the drum type washing machine based on 1st Embodiment. It is the figure which expanded the vicinity part of the T-shaped pipe line based on 1st Embodiment. It is a block diagram which shows the structure of the drum type washing machine based on 1st Embodiment. It is a flowchart which shows the control processing in the washing process and the rinse process based on 1st Embodiment. It is a figure which shows a mode that water circulates between an outer tank and a circulation waste_water | drain unit in disinfection rinse based on 1st Embodiment. The figure which shows a mode that the water in a 3rd pipe line is discharged | emitted by the preliminary | backup drain based on 1st Embodiment outside the apparatus, and the mode that the water in an outer tank is discharged | emitted outside the apparatus by this drainage FIG. It is side surface sectional drawing which shows the structure of the drum type washing machine based on 2nd Embodiment. It is the figure which expanded the vicinity part of the T-shaped pipe line based on 2nd Embodiment. It is a flowchart which shows the control processing in a washing process and a rinse process based on 2nd Embodiment. It is a figure which shows a mode that water circulates between an outer tank and a circulation drainage unit in washing | cleaning or a rinse which concerns on 2nd Embodiment. The figure which shows a mode that the water in a 3rd pipe line is discharged | emitted by the preliminary | backup drain which concerns on 2nd Embodiment, and the mode that the water in an outer tank is discharged | emitted by the main drainage outside the machine FIG.

  Hereinafter, a drum type washing machine as an embodiment of the washing machine of the present invention will be described with reference to the drawings.

<First Embodiment>
First, the drum type washing machine 1 according to the first embodiment will be described.

  FIG. 1 is a side sectional view showing the configuration of the drum type washing machine 1.

  The drum-type washing machine 1 includes a housing 10 that forms an appearance. The front surface 10a of the housing 10 is inclined from the central portion to the upper portion, and the laundry inlet 11 is formed on the inclined surface. The insertion port 11 is covered with a door 12 that can be freely opened and closed.

  The outer tub 20 is elastically supported by a plurality of dampers 21 in the housing 10. A drum 22 is rotatably disposed in the outer tub 20. The drum 22 corresponds to the washing tub of the present invention. The outer tub 20 and the drum 22 are inclined with respect to the horizontal direction so that the rear surface side becomes lower. As a result, the drum 22 rotates around the tilt axis tilted with respect to the horizontal direction. The inclination angle of the outer tub 20 and the drum 22 can be about 10 to 20 degrees. The opening 20a on the front surface of the outer tub 20 and the opening 22a on the front surface of the drum 22 are opposed to the charging port 11, and both the charging port 11 is closed by the door 12. A large number of dewatering holes 22 b are formed on the inner peripheral surface of the drum 22. Further, three baffles 23 are provided on the inner peripheral surface of the drum 22 at substantially equal intervals in the circumferential direction.

  A drive motor 30 that generates torque for driving the drum 22 is disposed behind the outer tub 20. The drive motor 30 is, for example, an outer rotor type DC brushless motor. The drive motor 30 rotates the drum 22 at a rotational speed at which the centrifugal force applied to the laundry in the drum 22 is smaller than gravity during the washing process and the rinsing process. On the other hand, during the dehydration process, the drive motor 30 rotates the drum 22 at a rotation speed at which the centrifugal force applied to the laundry in the drum 22 is much greater than the gravity.

  A detergent box 40 is disposed in the upper front part of the housing 10. In the detergent box 40, a detergent container 40a in which detergent is accommodated is accommodated so that it can be pulled out from the front. The detergent box 40 is connected by a water supply hose 42 to a water supply valve 41 arranged at the rear upper part in the housing 10. The detergent box 40 is connected to the upper part of the outer tub 20 by a water injection pipe 43. When the water supply valve 41 is opened, tap water is supplied from the water tap into the outer tub 20 through the water supply hose 42, the detergent box 40 and the water injection pipe 43. At this time, the detergent accommodated in the detergent container 40 a flows into the water and is supplied into the outer tub 20.

  A circulation drainage unit 50 is disposed in the housing 10 in the space below and behind the outer tub 20.

  The circulation / drainage unit 50 includes a circulation / drainage pump 51, a first pipeline 52, a filter device 53, a second pipeline 54, a T-shaped pipeline 55, a drainage valve 56, and a third pipeline 57. Is provided. The first pipe line 52, the second pipe line 54, and the third pipe line 57 are all configured by resin piping. The first pipeline 52, the second pipeline 54, and the third pipeline 57 correspond to the first flow path, the second flow path, and the third flow path of the present invention, respectively. The circulation / drainage pump 51 corresponds to the pump of the present invention.

  The circulation / drainage pump 51 is a spiral pump, for example, and is provided at a position lower than the outer tub 20. The first conduit 52 is connected to a drain port 20 b formed at the bottom of the outer tub 20 and a suction port 51 a of the circulation / drain pump 51. A filter device 53 is provided in the front lower portion of the housing 10 and in the middle of the first pipe line 52. The filter device 53 includes a lint filter 53a that can be taken out from the front. The water discharged from the outer tub 20 and sucked into the circulation / drainage pump 51 flows through the first conduit 52. The filter device 53 captures the lint mixed in the water discharged from the outer tub 20 with the lint filter 53a.

  The second conduit 54 is connected to the discharge port 51 b of the circulation / drainage pump 51 and the discharge port 13 provided at the lower rear portion of the housing 10. The second conduit 54 is connected to the external drain hose 70 at the discharge port 13. The water discharged from the circulation / drainage pump 51 flows through the second conduit 54. The second conduit 54 has a T-shaped conduit 55 at a portion extending substantially horizontally from the discharge port 51b. The T-shaped pipe line 55 includes a main pipe line 55a extending in a substantially horizontal direction and a branch pipe line 55b branched from the main pipe line 55a and extending in a substantially vertical direction. The main pipe 55 a connects the pipe 54 a on the discharge port 51 b side of the second pipe 54 and the pipe 54 b on the discharge port 13 side of the second pipe 54. A third pipe 57 is connected to the branch pipe 55b.

  FIG. 2 is an enlarged view of the vicinity of the T-shaped pipeline 55. As shown in FIG. 2, the diameter D <b> 1 of the second pipeline 54 is made larger than the diameter D <b> 2 of the third pipeline 57.

  The third pipeline 57 extends upward from the branch pipeline 55b so as to be substantially along the rear surface of the outer tub 20, is folded at a position above the outer tub 20, and is downward so as to be substantially along the rear surface of the outer tub 20. It extends and is connected to an outlet part 20 c provided on the rear surface of the outer tub 20. The outlet part 20 c causes the water that has flowed through the third pipeline 57 to flow into the outer tub 20. A gas-liquid mixer 58 is provided in the middle of the portion extending downward from the third pipe line 57. The gas-liquid mixer 58 has an intake port 58a for taking in ozone.

  Drainage for closing or opening the second conduit 54 to the conduit 54 b of the second conduit 54, which is downstream of the T-shaped conduit 55, that is, downstream of the branch point to the third conduit 57. A valve 56 is provided. The drain valve 56 includes a valve body 56a and an actuator 56b. The actuator 56b moves the valve body 56a between a closed position where the second pipe 54 is closed and an open position where the second pipe 54 is opened. The drain valve 56 is closed by the movement of the valve body 56a to the closed position, and the drain valve 56 is opened by the movement of the valve body 56a to the open position.

  Above the outer tub 20, an ozone generation unit 60 is disposed. The ozone generation unit 60 includes an ozone generator 61 and an air filter 62. The ozone generator 61 is a discharge-type ozone generator that generates a discharge such as a corona discharge or a silent discharge between a pair of electrodes, and generates ozone from the air passed between the pair of electrodes. The air filter 62 removes dust and the like contained in the air introduced into the ozone generator 61. The ozone generator 61 is connected to the intake port 58 a of the gas-liquid mixer 58 via the ozone supply pipe 63.

  The gas-liquid mixer 58 includes a venturi tube, and takes in ozone generated by the ozone generator 61 from the intake port 58a by a negative pressure action caused by water flowing through the venturi tube. The taken-in ozone is mixed with water flowing through the gas-liquid mixer 58, and water mixed with ozone, that is, ozone water is supplied into the outer tub 20.

  FIG. 3 is a block diagram showing a configuration of the drum type washing machine 1.

  The drum type washing machine 1 includes a control unit 101, a storage unit 102, an operation unit 103, a water level sensor 104, and a door lock device 105 in addition to the configuration described above.

  The operation unit 103 includes a power button 103a, a start button 103b, and a course selection button 103c. The power button 103 a is a button for turning on and off the power of the drum type washing machine 1. The start button 103b is a button for starting operation. The course selection button 103c is a button for selecting an arbitrary driving course from a plurality of driving courses related to the washing operation. The operation unit 103 outputs an input signal corresponding to the button operated by the user to the control unit 101.

  The water level sensor 104 detects the water level in the outer tub 20 and outputs a water level detection signal corresponding to the detected water level to the control unit 101.

  The door lock device 105 locks and unlocks the door 12 in accordance with a control signal from the control unit 101.

  The storage unit 102 includes an EEPROM, a RAM, and the like. The storage unit 102 stores a program for executing the washing operation of various washing operation courses. The storage unit 102 stores various parameters and various control flags used for executing these programs.

  Based on the signals stored in the storage unit 102 based on the signals from the operation unit 103, the water level sensor 104, and the like, the control unit 101 performs the drive motor 30, the water supply valve 41, the drain valve 56, the circulation / drain pump 51, and the ozone. Each load such as the generator 61 and the door lock device 105 is controlled.

  The drum type washing machine 1 performs a washing operation of various operation courses based on a user's selection operation by the course selection button 103c. In the washing operation, a washing process, a first intermediate dehydration process, a first rinse process, a second intermediate dehydration process, a second rinse process, and a final dehydration process are sequentially performed. In the second rinsing step, sterilization rinsing for sterilizing the laundry by rinsing the laundry with ozone water is performed.

  In the washing step and the rinsing step, the drum 22 acts on the laundry in the drum 22 in a state where water is accumulated in the outer tub 20 to a predetermined set water level that does not reach the lower edge of the inlet 11. Rotate clockwise and counterclockwise at a rotational speed smaller than gravity. The laundry in the drum 22 is beaten against the inner peripheral surface of the drum 22 by being scraped and dropped by the baffle 23. As a result, the laundry is washed or rinsed.

  In the intermediate dewatering process and the final dewatering process, the drum 22 rotates in one direction at a rotation speed at which the centrifugal force acting on the laundry in the drum 22 is much greater than gravity. By the action of centrifugal force, the laundry is pressed against the inner peripheral surface of the drum 22 and dehydrated.

  The control process by the control unit 101 in the washing process and the rinsing process will be described in detail below.

  The washing process includes a water supply process, a main washing process, and a drainage process, and the rinsing process includes a water supply process, a main rinse process, and a drainage process.

  FIG. 4 is a flowchart showing a control process in the washing process and the rinsing process.

  First, a water supply process is performed. The control unit 101 closes the drain valve 56 (S101), and then opens the water supply valve 41 (S102). When the water level detected by the water level sensor 104 reaches the set water level set according to the load amount or the like (S103: YES), the control unit 101 closes the water supply valve 41 (S104). Thus, the water supply process ends.

  Next, if it is a washing step, the main washing step is executed, and if it is a rinsing step, the main rinsing step is executed.

  The control unit 101 determines whether or not to perform sterilization rinsing in the current process (S105). If the current process is the main rinsing process or the first rinsing process, the control unit 101 determines not to perform sterilization rinsing (S105: NO). When the sterilization rinsing is not performed, the control unit 101 rotates the drum 22 (S106). Circulation / drainage pump 51 and ozone generator 61 are not operated. When the preset operation time has elapsed (S107: YES), the control unit 101 stops the drum 22 (S108).

  On the other hand, if the current process is the main rinsing process of the second rinsing process, the control unit 101 determines to perform sterilization rinsing (S105: YES). When performing sterilization rinsing, the control unit 101 rotates the drum 22 and activates the circulation / drainage pump 51 and the ozone generator 61 (S109).

  FIG. 5 is a diagram illustrating a state in which water circulates between the outer tub 20 and the circulating drainage unit 50 in the sterilization rinsing. Water in the outer tub 20 is sucked into the circulation / drainage pump 51 through the first conduit 52. Since the drain valve 56 is closed, the water discharged from the circulation / drain pump 51 flows through the second pipe 54 and the T-shaped pipe 55 to the third pipe 57. In the gas-liquid mixer 58, the ozone generated by the ozone generator 61 is mixed with the water flowing through the third pipe 57, and ozone water is generated. The generated ozone water flows out into the outer tank 20 from the outlet part 20c. In this way, ozone water circulates between the outer tub 20 and the circulating drainage unit 50. While circulating, the concentration of ozone water gradually increases. The laundry in the drum 22 is rinsed with ozone water and sterilized.

  When the preset operation time has elapsed (S110: YES), the control unit 101 stops the drum 22, the circulation / drainage pump 51, and the ozone generator 61 (S111).

  Thus, the main washing process or the main rinsing process is completed.

  Next, a drainage process is performed. First, the control unit 101 opens the drain valve 56 (S112) to perform preliminary drainage. FIG. 6A is a diagram showing a state in which the water in the third pipeline 57 is discharged outside the apparatus by the preliminary drainage. Before the circulation and drainage pump 51 is operated, water supply pressure is not applied in the third pipe 57, so that water remaining in the third pipe 57 passes through the T-shaped pipe 55 and the second pipe 54. Discharged outside the machine. The control unit 101 determines whether or not a predetermined preliminary drainage time has elapsed (S113). The preliminary drainage time is, for example, a time required for almost or all of the water remaining in the third pipeline 57 to be discharged from the third pipeline 57.

  When the preliminary drainage time has elapsed (S113: YES), the control unit 101 operates the circulation / drainage pump 51 (S114) to perform the main drainage. FIG. 6B is a diagram illustrating a state in which the water in the outer tub 20 is discharged outside the apparatus by the main drainage. When the circulation / drainage pump 51 is activated, the water in the outer tub 20 is sucked into the circulation / drainage pump 51 through the first conduit 52. Since the drain valve 56 is open, the water discharged from the circulation / drain pump 51 is discharged outside the machine through the second conduit 54 and the drain valve 56. In this way, the water in the outer tub 20 is forcibly discharged by the circulation / drainage pump 51. At this time, since the water supply pressure generated in the third pipe line 57 is lowered by discharging the water in the second pipe line 54 to the outside of the machine, the water is not pumped up to the outlet part 20c. In particular, when the third pipe 57 is lifted up to the upper part of the outer tub 20 as in the present embodiment, the outlet 20c even if the discharge pressure of the circulation / drainage pump 51 increases. Water can be made difficult to pump up to.

  The control unit 101 determines whether or not the drainage is completed (S115). For example, after the water level in the outer tub 20 reaches the lower limit water level that can be measured by the water level sensor 104, the control unit 101 determines that the drainage is completed when a predetermined time has elapsed. When determining that the drainage is completed (S115: YES), the control unit 101 stops the circulation / drainage pump 51 (S116).

  Thus, the draining process is completed, and the washing process or the rinsing process is completed.

  The drum type washing machine 1 according to the present embodiment has been described above. However, the drum type washing machine 1 according to the present embodiment has the above-described configuration, thereby providing the following operational effects.

  That is, according to the present embodiment, ozone water can be circulated and supplied into the outer tub 20 using one circulation / drainage pump 51, and water is forced out of the machine from the outer tub 20. It can be discharged. Accordingly, sterilization can be performed with ozone water at the time of rinsing, and cleaning performance can be improved, while smooth drainage can be performed at the time of drainage, and drainage performance can be improved.

  Further, according to the present embodiment, in the drainage process, when the drainage valve 56 is not opened due to a failure or the like, the water discharged from the outer tub 20 passes through the third pipeline 57 and the outer tub 20. Unlike the case where the third pipe 57 is not provided, the second pipe 54 is not subjected to excessive pressure. Therefore, it is possible to prevent the occurrence of excessive pressure from causing a part of the second pipe 54 to be disconnected or damaged, resulting in water leakage outside the machine.

  Furthermore, according to the present embodiment, the diameter D1 of the second conduit 54 is made larger than the diameter D2 of the third conduit 57. Thereby, when the circulation drainage unit 50 is configured in the limited arrangement space in the housing 10, the water supply pressure in the third pipe 57 can be increased during the circulation of the water, and the outer tub 20. The ozone water can be smoothly circulated between the circulatory drainage unit 50 and the circulatory drainage unit 50, and at the time of drainage, the drainage flow rate through the second conduit 54 can be increased, and the drainage performance can be further improved.

  Furthermore, when the circulation / drainage pump 51 is operated immediately after the drain valve 56 is opened, a large amount of water remains in the third pipe 57, and therefore, the low water pressure generated in the third pipe 57 Water easily leaks from the third pipeline 57 into the outer tub 20. In this regard, according to the present embodiment, the circulation / drainage pump 51 is operated after the water remaining in the third pipe 57 is discharged by the preliminary drainage, so that the low water supply pressure in the third pipe 57. When this occurs, it is difficult for water to leak from the third pipeline 57 into the outer tub 20.

<Second Embodiment>
Next, the drum type washing machine 1 according to the second embodiment will be described.

  FIG. 7 is a side sectional view showing the configuration of the drum type washing machine 1.

  In the drum type washing machine 1 of the present embodiment, a shower nozzle 24 is provided at the front upper portion in the outer tub 20 so that the outlet faces the drum 22 instead of the outflow port 20c. Further, in the drum type washing machine 1 of the present embodiment, the circulating drainage unit 50 includes a third pipeline 59 instead of the third pipeline 57 configured to take in ozone by the gas-liquid mixer 58. . The third pipe 59 extends upward from the branch pipe 55 b of the T-shaped pipe 55 so as to be substantially along the rear surface of the outer tub 20, and then extends forward so as to be substantially along the outer peripheral surface of the outer tub 20. , Connected to the shower nozzle 24. The third pipeline 59 is constituted by a resin pipe. Furthermore, in the drum type washing machine 1 of the present embodiment, the ozone generation unit 60 is not provided.

  The shower nozzle 24 sprinkles the water sent from the third pipe 59 toward the laundry in the drum 22 from above the drum 22. The shower nozzle 24 corresponds to the outlet portion of the present invention.

  FIG. 8 is an enlarged view of the vicinity of the T-shaped pipeline 55. As shown in FIG. 8, the diameter D <b> 1 of the second pipeline 54 is made larger than the diameter D <b> 3 of the third pipeline 59.

  Other configurations in the drum type washing machine 1 of the present embodiment are the same as the configurations in the drum type washing machine 1 of the first embodiment.

  In the drum type washing machine 1 of the present embodiment, sterilization rinsing using ozone water is not performed, and the circulation and drainage pump 51 operates in all of the washing process and the two rinsing processes. Thereby, the water in the outer tub 20 is sent to the shower nozzle 24, and the water falls on the laundry in the drum 22 from the outlet of the shower nozzle 24.

  FIG. 9 is a flowchart showing a control process in the washing process and the rinsing process.

  The control processing in steps S101 to S104 related to the water supply process and the control processing in steps S112 to S116 related to the drainage process are the same as in the first embodiment.

  In the main washing step or the main rinsing step, the control unit 101 rotates the drum 22 and activates the circulation / drainage pump 51 (S121).

  FIG. 10 is a diagram illustrating how water circulates between the outer tub 20 and the circulating drainage unit 50 during washing or rinsing.

  Water in the outer tub 20 is sucked into the circulation / drainage pump 51 through the first conduit 52. Since the drain valve 56 is closed, the water discharged from the circulation / drain pump 51 flows through the second pipe 54 and the T-shaped pipe 55 to the third pipe 59 and reaches the shower nozzle 24. . Water is poured from the shower nozzle 24 toward the laundry in the drum 22. Thereby, water containing a detergent for washing or water for rinsing can be sufficiently contained in the laundry.

  FIG. 11A is a diagram illustrating a state in which the water in the third pipeline 59 is discharged to the outside by the preliminary drainage. FIG. 11B is a diagram illustrating a state in which water in the outer tub 20 is discharged outside the apparatus by the main drainage.

  As shown in FIG. 11A, at the time of preliminary drainage, water remaining in the third pipeline 59 is discharged outside the machine through the T-shaped pipeline 55 and the second pipeline 54. In addition, as shown in FIG. 11B, during the main drainage, the water in the outer tub 20 is discharged outside the machine through the first pipeline 52 and the second pipeline 54 by the operation of the circulation and drainage pump 51. Is done.

  The drum type washing machine 1 according to the present embodiment has been described above. However, the drum type washing machine 1 according to the present embodiment has the above-described configuration, thereby providing the following operational effects.

  That is, according to the present embodiment, water can be circulated and supplied into the outer tub 20 by using one circulation / drainage pump 51 and water can be poured from the shower nozzle 24 onto the laundry. Water can be forcibly discharged from within 20. Thereby, when it is easy to wash, the laundry can be sufficiently filled with water, so that the washing performance is improved, and at the time of drainage, smooth drainage can be performed, and the drainage performance is improved.

  Further, according to the present embodiment, in the drainage process, when the drainage valve 56 is not opened due to a failure or the like, the water discharged from the outer tub 20 passes through the third pipeline 59 and the outer tub 20. Unlike the case where the third pipe 59 is not provided, the second pipe 54 is not subjected to excessive pressure. Therefore, it is possible to prevent the occurrence of excessive pressure from causing a part of the second pipe 54 to be disconnected or damaged, resulting in water leakage outside the machine.

  Furthermore, according to the present embodiment, the diameter D1 of the second conduit 54 is made larger than the diameter D3 of the third conduit 59. Thereby, when the circulation drainage unit 50 is configured in a limited arrangement space in the housing 10, the water supply pressure in the third pipe 59 can be increased during the circulation of water, and the outer tub 20. In addition, water can be smoothly circulated between the circulatory drainage unit 50 and the drainage flow rate through the second pipe 54 can be increased during drainage, thereby further improving drainage performance.

  Furthermore, according to the present embodiment, after the water remaining in the third pipeline 59 is discharged by the preliminary drainage, the circulation / drainage pump 51 is operated, so that a low water supply pressure is generated in the third pipeline 59. When it occurs, it is difficult for water to leak from the third pipeline 59 into the outer tub 20.

<Example of change>
Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments and the like, and various modifications can be made to the embodiments of the present invention in addition to the above. is there.

  For example, in the second embodiment, the gas-liquid mixer 58 of the first embodiment is provided in the middle of the third conduit 59, and the ozone generation of the first embodiment is performed above the outer tank 20. The unit 60 is provided, and the ozone supplied from the ozone generation unit 60 may be mixed with the water flowing in the third pipeline 59 by the gas-liquid mixer 58. If it does in this way, it will become possible to disinfect the laundry by dropping ozone water from the shower nozzle 24 onto the laundry. In this case, ozone water can be sufficiently contained in the laundry, and the sterilization effect is enhanced.

  Furthermore, in the said 1st Embodiment, the circulation supply of the ozone water to the outer tank 20 is performed in the rinse process of the 2nd surface, but also in the outer tank 20 also in the 1st rinse process and a washing process. The ozone water may be circulated and supplied.

  Furthermore, the present invention can be applied not only to a drum type washing machine but also to a fully automatic washing machine that performs washing of laundry in a vertical washing laundry dewatering tub. Furthermore, the present invention can be applied to a drum type washing machine having a drying function, that is, a drum type washing machine and a fully automatic washing machine having a drying function, that is, a fully automatic washing and drying machine. it can.

  In addition, the embodiment of the present invention can be variously modified as appropriate within the scope of the technical idea shown in the claims.

20 Outer tank
20c Outlet part
22 drums (washing tub)
24 Shower nozzle (outlet)
50 Circulating drainage unit
51 Circulation / drainage pump (pump)
52 1st pipe line (1st flow path)
54 Second pipe (second flow path)
56 Drain valve
57 3rd pipe line (3rd flow path)
58 Gas-liquid mixer
59 3rd pipe line (3rd flow path)
61 Ozone generator
101 Control unit

Claims (4)

An outer tank,
A washing tub rotatably disposed in the outer tub;
A pump provided at a position lower than the outer tank;
A first flow path connected to the bottom of the outer tub and the suction port of the pump, through which water discharged from the outer tub and sucked into the pump flows;
A second flow path connected to a discharge port of the pump, through which water discharged from the pump flows;
A third flow path branched from the second flow path and extending upward;
An outlet portion that is provided in the outer tub and connected to the third flow path, and causes the water flowing through the third flow path to flow into the outer tub,
A drain valve provided in the second flow path downstream from the branch point to the third flow path, for closing or opening the second flow path;
A controller for controlling the pump and the drain valve,
The controller is
Performing a first control process for closing the drain valve and operating the pump; and a second control process for opening the drain valve and operating the pump ;
In the second control process, before the pump is operated, the drain valve is opened to perform preliminary drainage for draining the water remaining in the third pipe line, and the preliminary drainage is performed by opening the drain valve. After a predetermined time has elapsed, the pump is operated to perform main drainage .
A washing machine characterized by that. The washing machine according to claim 1,
The diameter of the second flow path is larger than the diameter of the third flow path;
A washing machine characterized by that. The washing machine according to claim 1 or 2 ,
An ozone generator for generating ozone;
A gas-liquid mixer that is provided in the third flow path and takes in ozone generated by the ozone generator and mixes it with water flowing through the third flow path,
The control unit operates the ozone generator together with the pump in the first control process.
A washing machine characterized by that. In the washing machine according to any one of claims 1 to 3 ,
The outlet portion has a water outlet facing the washing tub and sprays water from the outlet into the washing tub, thereby allowing the water flowing through the third flow path to pass through the washing tub. Let it flow into the outer tub,
A washing machine characterized by that.

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