JP4985806B2 - Washing machine - Google Patents

Description

  The present invention relates to a washing machine that controls charging of a liquid detergent.

  Conventionally, in this type of washing machine, a configuration has been proposed in which a liquid detergent is put into a washing and dewatering tank from a detergent tank in which the liquid detergent is stored in advance (see, for example, Patent Document 1).

  FIG. 6 shows a longitudinal sectional view of a first embodiment of a conventional washing machine described in Patent Document 1, and FIG. 7 is a sectional view of an essential part of a second embodiment of the washing machine. .

  As shown in FIG. 6, the outer cover 19 covers the upper portion of the outer shell 6, and is provided with a control device 10, a water supply valve 11, a water supply path 12, and the like.

  In the outer cover 19, a detergent tank 21 containing a liquid detergent 20 in an amount that can be used for at least a plurality of washings is provided.

  The detergent tank 21 has a replenishing port 21a for replenishing the liquid detergent 20 hermetically closed by a detergent tank lid 22 so that the inside of the detergent tank 21 can be sealed, and has an air inlet 21b and a liquid outlet 21c. Yes.

  The air pump (pump device) 23 is used to feed the liquid detergent 20 in the detergent tank 21 into the washing and dewatering tank 1. The air pump 23 is composed of a piston type, a valve type, etc. The air pump 23 communicates with the air inlet 21b to increase the air pressure in the sealed detergent tank 21.

  Here, the sealing tube 24 forms an air reservoir 24a that is higher than the liquid level of the liquid detergent 20 in the detergent tank 21 so that air remains inside.

  The control device 10 has a cloth amount determining means for determining the amount of laundry (clothing) put into the washing and dewatering tub 1, and in accordance with the determination result determined by the cloth amount determining means, that is, The air pump 23 is operated in accordance with at least one of the amount of laundry or the amount of water according to the amount of laundry, and the liquid detergent 20 is introduced into the washing and dewatering tub 1 from the liquid outlet 21c. ing.

  In the example of FIG. 7, the detergent tank 25 has a replenishment port 25 a for replenishing the liquid detergent 20 so that the detergent tank 25 can be sealed with the detergent tank lid 22, and the air inlet 25 b, the liquid outlet 25 c and the air And a chamber 25d.

  By the operation of the air pump 23, air is communicated to the air inlet 25b of the detergent tank 25 directly connected by the sealed pipe 26, and the air pump 23 increases the air pressure in the sealed detergent tank 25 to thereby increase the liquid outlet 25c. Liquid detergent flows out more into a detergent holding case (not shown), and the detergent holding case is a drawer-type case in which care is taken not to apply the detergent stock solution directly to clothing such as when making a reservation.

JP 2001-259290 A

  However, in such a conventional configuration, since the liquid detergent is directly put into the washing and dewatering tank, the detergent that is not diluted in the washing water directly adheres to the clothes. In the example of FIG. 7, the detergent does not adhere to the clothes during a long waiting time such as a reserved operation, but before the washing operation, the detergent drops from the detergent holding case to the washing and dewatering tank and adheres to the clothes.

  If the detergent adheres to the soiled clothes as described above, the foaming of the detergent becomes worse, and the washing per unit volume by the detergent high concentration washing performed at a water level lower than the rated water level before the washing main washing operation which has begun to be frequently used in recent years. There is a problem that a new cleaning method in which the amount of the surfactant is greatly increased to enhance the cleaning effect cannot be adopted.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object of the present invention is to enable high-concentration cleaning of a detergent without causing the detergent liquid to be dropped directly onto clothes when the liquid detergent is automatically used.

  In order to achieve the above object, the present invention provides an outer tub that is elastically suspended in a housing, an outer tub cover that covers the upper surface of the outer tub, and an inner tub that is rotatably supported in the outer tub. A pulsator provided at the inner bottom of the inner tub, a driving means for rotationally driving the inner tub or / and the pulsator, a means for detecting a water level by conductivity or water pressure, and a liquid detergent provided at the upper part of the housing. Liquid detergent automatic charging device for storing and supplying; a water supply valve and a water supply hose provided in the upper part of the housing for supplying water into the inner tank; and the outer tank connected between the liquid detergent automatic charging apparatus and the outer tank cover; A series of washing, rinsing, and dehydrating operations, controlling the operation of the detergent pouring hose installed so as to throw liquid detergent between the inner tank and the drive means, the liquid detergent automatic feeding device, the water supply valve, etc. Sequentially control the process And the control means operates the liquid detergent automatic charging device at the initial stage of the washing process so that the liquid detergent is placed between the outer tub and the inner tub via the detergent injection hose. The water supply valve supplies water to the first predetermined water level, rotates the inner tank to foam and dissolve the detergent, and then supplies water to the predetermined water level lower than the rated water level and higher than the first predetermined water level by the water supply valve. The inner tank or the pulsator is rotated to perform cleaning with a high concentration of detergent.

  Thereby, since liquid detergent is not dripped directly on dirty clothes, foaming of the detergent becomes extremely good, the effect of detergent high concentration washing can be enhanced, and washing time can be effectively reduced.

  Since the washing machine of the present invention does not drop the detergent solution directly onto the clothes, the effect of washing with a high concentration of detergent is enhanced and the washing time can be reduced.

1 is a longitudinal sectional view of a washing machine according to Embodiment 1 of the present invention. Main part exploded perspective view of the washing machine An enlarged exploded sectional view of the main part of the washing machine Block diagram of the washing machine The figure which shows the sequence of the washing process of the same washing machine Longitudinal sectional view of a first embodiment of a conventional washing machine Sectional drawing of the principal part of 2nd Example of the washing machine

  According to a first aspect of the present invention, there is provided an outer tank that is elastically suspended in a housing, an outer tank cover that covers an upper surface of the outer tank, an inner tank that is rotatably supported in the outer tank, A pulsator provided at the inner bottom, a driving means for rotationally driving the inner tank or / and the pulsator, a means for detecting the water level by conductivity or water pressure, and a liquid provided and housed in the upper part of the housing for supplying and supplying a liquid detergent An automatic detergent charging device, a water supply valve and a water supply hose provided at the upper part of the housing for supplying water into the inner tub, and connected between the liquid detergent automatic charging device and the outer tub cover and between the outer tub and the inner tub Controls the operation of the detergent water injection hose installed to inject liquid detergent in between, the drive means, the liquid detergent automatic injection device, the water supply valve, etc., and sequentially controls a series of steps of washing, rinsing and dehydration Control means for The control means operates the liquid detergent automatic charging device at the initial stage of the washing process to supply the liquid detergent between the outer tub and the inner tub through the detergent pouring hose, and the water supply valve Water is supplied to a first predetermined water level, the inner tank is rotated to foam and dissolve the detergent, and then the inner tank or the pulsator is supplied to a predetermined water level lower than the rated water level and higher than the first predetermined water level by the water supply valve. By rotating and rotating the detergent, the detergent solution is not dripped directly onto the soiled clothes, so the detergent with high concentration can penetrate into the clothes. The washing time can be reduced.

  According to a second aspect of the present invention, in particular, in the first aspect of the invention, the detergent water injection hose has a flexible cylindrical water injection hose connection pipe that is flexible and has an annular rib formed at the tip thereof. By inserting the water injection hose connection pipe into the connection port provided with the claw portion and engaging the annular rib with the claw portion, it can be connected by a one-touch operation, and productivity and serviceability are improved. At the same time, the liquid detergent can be prevented from overflowing outside the outer tank cover. Moreover, since the detergent injection hose is flexible, even if the entire outer tub that is a vibration system is swung during dehydration, there is no influence on the vibration system.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the thing of the same structure as a prior art example attaches | subjects the same code | symbol, and abbreviate | omits description. Further, the present invention is not limited by this embodiment.

(Embodiment 1)
1 is a longitudinal sectional view of a washing machine according to Embodiment 1 of the present invention, FIG. 2 is an exploded perspective view of a principal part of the washing machine, and FIG. 3 is an enlarged exploded sectional view of a principal part.

  In FIG. 1, a housing 41 is provided with an outer tub 43 that is elastically suspended by a plurality of suspensions 42 and absorbs vibration during dehydration by the suspensions 42. Inside the outer tub 43, an inner tub 44 for storing clothes and objects to be dried is disposed rotatably around a washing / dehydrating shaft 45 having a hollow and double structure. Further, a pulsator 46 that stirs the object to be dried is rotatably arranged.

  The inner peripheral wall of the inner tub 44 is provided with a number of vent holes 44a that are drain holes for dehydration and also for drying, and a fluid balancer 47 is provided above. A motor (driving means) 48 is attached to the outer bottom of the outer tub 43 and is connected to the inner tub 44 or the pulsator via the clutch 49 and the washing / dehydrating shaft 45 for switching the transmission of rotational force to the washing / dehydrating shaft 45 during washing or dehydrating. 46 is connected. The pulsator 46 has a substantially pan-like shape having an inclined surface 50 on the outer periphery, and forms a stirring protrusion 51. The clothes are stirred during the washing process, and the object to be dried is rotated by the pulsator 46 during the drying process. It is easy to soar upward along the inclined surface by centrifugal force. In other words, the clothes are configured to move left and right (in the rotational direction) and also move up and down by stirring.

  An inner tank cover 35 is attached to the inner peripheral wall of the inner tank 44, and the inner tank 44 constitutes a detergent charging path 36 for charging powder detergent. An inner tank cover opening 59 is formed at the lower end portion of the inner tank cover 35, and a detergent container lid 37 is attached to the upper end portion so as to be freely opened and closed. When powder detergent is introduced with the detergent lid 37 opened, the detergent falls to the vicinity of the inner tank cover opening 59, and when the lid is closed and the washing operation is started by rotating the pulsator 46, the powder detergent is stirred by the water flow. It is designed to elute into washing water.

  The heat exchange duct 52 having a drying function dehumidifies the circulating hot air (circulating air), and one end of the heat exchange duct 52 is connected to a drainage passage port 54 provided at the lower portion of the outer tub 43 through the connection duct 53. The other end is connected to the inlet side of the hot air blowing means 61 constituting the hot air circulation path 57.

  The warm air blowing means 61 is provided with a heater 56, a drying fan 55, which will be described later with reference to FIG. 4, a filter (not shown) for collecting lint generated from clothes, and the like. The upper bellows-like hose 58 having the hot air jet hole 60 is connected. Further, a temperature detecting means 62 (described later in FIG. 4) for detecting the temperature of the circulating air entering the hot air blowing means 61 is provided on the inlet side of the hot air circulation path 57, and heated by a heater on the outlet side. A temperature detecting means 63 for detecting the temperature of the circulating air is provided to detect the circulating air temperature during the drying process.

  The outer tub 43 is provided with an outer tub cover 65 that hermetically covers the upper surface of the outer tub 43, and the outer tub cover 65 is provided with a hot air blowing hole 60 from the upper and lower bellows-like hose 58 that can be expanded and contracted. Yes. Further, an inner lid 66 is provided on the outer tank cover 65 so as to be freely opened and closed so that clothes can be taken in and out.

  An upper frame body 68 having a clothing insertion port 67 is attached to the upper portion of the housing 41 at a substantially central portion, and an outer lid 69 is provided so as to be able to open and close so as to cover the clothing insertion port 67.

  Further, a support member 71 equipped with the above-described hot air blowing means 61 and the water supply valve 70 is provided inside the rear part of the upper frame 68, and a water supply hose 73 is connected to the water supply valve 70, and the support member 71 is connected to the inner tub 44 through a water injection member (not shown) provided in 71 so as to be able to supply water as washing water. That is, if the water supply valve 70 is opened, the inner tank 44 and the inner tank 44 are inwardly moved to predetermined water levels such as rank 1, rank 3, rank 3, rank 5, and the like shown in FIG. Supply the amount of water.

  The support member 71 inside the upper frame 68 can store an amount of liquid detergent that can be used for a plurality of washings, and automatically puts the liquid detergent into the outer tub 43. 64 is configured. A flexible detergent water injection hose 72 is connected between the liquid detergent automatic injection device 64 and the outer tank cover 65, and the liquid detergent sent from the liquid detergent automatic injection device 64 passes through this detergent water injection hose 72. Then, it is dropped between the outer tank 43 and the inner tank 44. Since the detergent water injection hose 72 is flexible, even when the entire outer tub 43 that is the vibration system is swung during dehydration, there is almost no influence on the vibration system or vibration on the water injection hose 72.

  A drain valve 74 for draining the water in the outer tub 43 is provided at the bottom of the outer tub 43, and is connected to the heat exchange duct 52 and the connection duct 53 via the drain duct 75, and the connection duct 53 and the heat exchange duct 52 are connected. The waste water from the water is guided to a drain duct 75 and a drain valve 74 and drained from the drain hose 76 to the outside of the machine.

  A conductivity detecting means 78 having a pair of electrodes 94 for detecting the conductivity of washing water and detecting the presence or absence of water and the type of detergent is provided inside the outer periphery of the outer tub 43. Since it is below the upper surface of the outer peripheral portion of the pulsator 46 at the lower part of 43, it is less susceptible to the influence of the water flow due to the rotation of the pulsator 46 than when it is above the upper surface of the outer peripheral portion of the pulsator 46, Can do.

  The cooling blower 79 is attached to the side surface of the housing 41 and is configured to blow air so as to cool the outer tub 43, the heat exchange duct 52, and the like inside the housing 41.

  The control device 80 is integrally formed, and is disposed substantially vertically on the back surface (back cover) 81 of the housing 41, and a cooling blower 79 is provided below the control device 80. The control device 80 is covered and protected by a cover 82.

  An operation display unit 85 including an input setting unit 83 and a display unit 84 described later with reference to FIG. 4 is provided on the front surface of the upper frame 68.

  In the exploded perspective view of the main part of FIG. 2, the support member 71 provided at the rear inner side of the upper frame 68 absorbs a water supply valve 70 for supplying tap water into the water tank, bath water and the like into the water tank. A water suction pump 91 to be supplied, a hot air blowing means 61 including a hot air circulation path 57 and the like, an automatic liquid detergent charging device 64 and the like are mounted.

  The liquid detergent automatic charging device 64 is provided with a detergent replenishing port 38 for replenishing liquid detergent in a detergent tank 77 that can store a quantity of liquid detergent that can be used for a plurality of washings. The detergent tank 77 can be sealed. Further, a detergent pouring hose 72 that communicates with the inside of the detergent tank 77 and is connected to the outer tank cover 65 is provided. The air pressure in the detergent tank 77 sealed by the air pump 40 is increased, and the liquid detergent is washed by the air pressure. The tank 77 is configured to be pumped from the tank 77 and dropped between the outer tank 43 and the inner tank 44 via the detergent pouring hose 72.

  The support member 71 is attached from below the upper frame 68, screws 95 a and 95 b are screwed from the rear surface of the upper frame 68, and screws 95 c and 95 d are screwed from the upper surface of the upper frame 68, While fixing to the frame 68, the rear part of the support member 71 is fixed to the rear surface of the housing 41 with screws 96a and 96b. As a result, the upper frame 68 is attached in a substantially vertical direction so that the front surface of the upper frame 68 is upward by removing the screws 96a and 96b with the support member 71 attached and fixed with the screws 95a to 95d. The housing 41 can be removed.

  3 is a view showing a connection between the detergent water supply hose 72 and the outer tub cover 65, and the water injection hose connection pipe 31 is fixed to the tip of the detergent water supply hose 72. The hose connection pipe 31 has a cylindrical shape, and a cylindrical portion 94 is formed at an inner lower end thereof, and an annular rib 32 is formed at an outer side.

  On the other hand, the outer tank cover 65 is formed with a connection port 34 having a plurality of claw portions 33 which are cylindrical and have slit-shaped grooves 97 so as to have elasticity. A cylindrical portion 92 of the connection port 34 is formed. The tube portion 94 of the water injection hose connection pipe 31 is inserted therein, and the claw portion 33 and the annular rib 32 of the connection port 34 are engaged by a one-touch operation, whereby the detergent water injection hose 72 and the outer tank cover 65 are connected. The

  FIG. 4 is a block circuit diagram of the washing machine according to Embodiment 1 of the present invention.

  In the block circuit diagram of FIG. 4, the control device 80 includes a motor (driving means) 48, a clutch 49, a drying fan 55 and a heater 56 constituting a warm air blowing means 61, and a drain valve via a load driving means 86. 74, a cooling fan (cooling means) 79, a water supply valve 70, an air pump 40, and the like are controlled, and a control means 87 for controlling each step of washing, rinsing, dehydration and drying is provided.

  The control means 87 is constituted by a microcomputer or the like, and starts operating when power is supplied from the commercial power supply 88 when the power switch 89 is turned on. The cloth amount detection means 93, the water level detection means 90, and the temperature detection means 62 and 63 Based on the contents set by the user's input in the input setting means 83, the setting contents are displayed on the display means 84, and through the load driving means 86 composed of a bidirectional thyristor, a relay and the like. The operation of the motor 48, the clutch 49, the drying fan 55, the heater 56, the drain valve 74, the cooling fan 79, the water supply valve 70, the water absorption pump 91, etc. is controlled, and the steps of washing, rinsing, dehydration and drying are controlled. Control. The input setting unit 83 and the display unit 84 constitute an operation display unit 85.

  The control means 87 detects the presence or absence of washing water and the type of detergent based on the conductivity of the washing liquid obtained from the conductivity detection means 78 and the rate of change thereof, and controls each stroke.

  Then, the control means 87 turns off the heater 56 when the temperature detected by the temperature detection means 63 reaches a first predetermined temperature (for example, 110 ° C.) during the drying process, and the temperature detection means 62 at that time. When the second predetermined temperature (for example, 2k) falls from the temperature due to the above, the heater 56 is operated to adjust the temperature of the circulating air.

  In the above configuration, the operation of the washing process will be described.

  FIG. 5 shows an example of a sequence table of the washing process of the washing machine in the first embodiment of the present invention. Hereinafter, the process will be described together with the configuration diagram showing the longitudinal section shown in FIG.

  In the washing process, the user opens the outer lid 69, opens the inner lid 66, puts clothes into the inner tub 44, and sets the driving course and the course for automatically putting the liquid detergent in the input setting means 83. Is started, the cloth amount detected by the cloth amount detecting / fixing means 93 is detected, the control means 87 determines the water level and the detergent amount according to the cloth amount, and the display means 84 displays them.

  Then, the control device 80 operates the air pump 40 for a predetermined time corresponding to the determined amount of detergent through the load driving means 86 to increase the air pressure in the sealed detergent tank 77, thereby increasing the air pressure in the detergent tank 77. The liquid detergent is extruded between the outer tank 43 and the inner tank 44 via the detergent water injection hose 72 and dropped. Thereafter, the water supply valve 70 is operated to supply water into the tank up to rank 1 via the water supply hose 73.

  In addition, the water level is set so that the water level becomes higher in order from, for example, rank 1 to rank 9, and the water level up to rank 3 is lower than the upper surface of the outer peripheral portion of the pulsator 46, and from rank 4 to rank 9 Is the water level at which washing and stirring b is performed according to the amount of cloth, and rank 9 is the highest water level. FIG. 5 shows a sequence example when the amount of cloth is large and a high water level is detected.

  The rank 1 of the water level is approximately 100 mm lower than the upper surface of the outer peripheral portion of the pulsator 46, and is a water level at which the conductivity detecting means 78 is immersed in water. The water level is detected by the conductivity detecting means 78 and the water supply is stopped.

  The water level detection means 90 is a method generally used in a washing machine that detects the water pressure received by an air trap (not shown) provided in the outer tub 43. In this method, the outer periphery of the pulsator 46 is used. Accurate detection of the lowest water level that is approximately 100 mm lower than the upper surface has a problem in detection accuracy because the water pressure is very small. However, by detecting with the conductivity detecting means 78, it is possible to accurately detect that the water level has reached the lowest rank when the water touches the pair of electrodes 94 of the conductivity detecting means 78.

  Next, with the drain valve 74 closed, the clutch 49 of the transmission mechanism is switched to the dehydrating side, and the power of the motor 48 is transmitted to the inner tank 44 through the dehydrating shaft and rotated, so that the inner tank 44 and the pulsator are rotated. 46 are rotated together at a low speed of about 100 r / min (tank rotation operation). As a result, the washing liquid in the tub slowly rotates between the inner tub 44 and the outer tub 43 due to the centrifugal force, and the detergent is sufficiently dissolved and foamed without adhering to the dirt on the clothes. .

  Next, while supplying water up to rank 2 of the water level, with the drain valve 74 closed, the clutch 49 of the transmission mechanism is switched to the dewatering side, and the power of the motor 48 is transmitted to the inner tank 44 via the dewatering shaft. The inner tank 44 and the pulsator 46 are rotated together at a lower speed around 35 r / min (water supply & tank rotation) together with the detergent foamed to a high concentration in the clothes and stopped. After that, water is supplied up to rank 3, the power of the motor 48 is transmitted to the pulsator 46 through the washing shaft by the clutch 49 of the transmission mechanism, and the detergent a high concentration cleaning of the agitator a that the pulsator 46 rotates is performed. Water is supplied up to rank 5 when the amount of cloth is large, and a detergent a high-concentration washing with stirring a is performed.

  As described above, in the sequence table of FIG. 5, the rated water level (instead of the detergent high-concentration washing according to the cloth amount determined by the cloth amount detection means 93) in the time limit indicated by the detergent high-concentration washing 98. Water level during normal washing: In this example, since it was determined to be high-capacity clothing, water was gradually supplied from a lower water level than rank 9), which is a high water level. The detergent is washed with a high concentration while allowing the detergent foamed to a high concentration to penetrate into the clothes.

  After that, for example, water is supplied to a high water level of rank 9 when the amount of clothes is large, and the operation of washing and stirring b by normal pulsator rotation is performed, and the washing process is completed.

  As described above, in the present embodiment, the air pump is operated by the control means to increase the air pressure in the sealed detergent tank of the liquid detergent automatic charging device, and the liquid detergent stored by the air pressure is supplied to the detergent tank. From the outer tub and the inner tub, it is made to drip between the outer tub and the inner tub through a detergent water injection hose connected to the outer tub cover.

  This prevents the liquid detergent from dripping directly onto dirty clothes, so that the foaming of the detergent is extremely good, and the detergent is stirred while gradually raising it from a low water level before the main washing with water to the rated water level. The effect of high concentration cleaning is enhanced, and the cleaning time can be effectively reduced.

  In addition, the detergent injection hose has flexibility, and a water injection hose connection pipe fixed to the tip of the detergent injection hose and formed with an annular rib on the outside is formed on the outer tank cover provided on the upper surface of the outer tank, and has a plurality of elasticity. The detergent water injection hose and the outer tank cover are connected to each other by inserting the claw portion and the annular rib into one with a one-touch operation.

  Thereby, productivity and serviceability are improved, and liquid detergent can be prevented from overflowing outside the outer tank cover. Moreover, since the detergent injection hose is flexible, even if the entire outer tub that is a vibration system is swung during dehydration, there is no influence on the vibration system.

  As described above, the washing machine according to the present invention can perform high-concentration detergent cleaning, and thus can be applied to various washing machines such as a drum-type washing machine.

31 Water injection hose connection pipe 32 Annular rib 33 Claw part 34 Connection port 40 Air pump 41 Housing 43 Outer tank 44 Inner tank 46 Pulsator 48 Motor (drive means)
64 Liquid detergent automatic charging device 65 Outer tank cover 68 Upper frame 70 Water supply valve 71 Support member 72 Detergent water injection hose 73 Water supply hose 87 Control means

Claims (2)

An outer tank elastically suspended in the housing, an outer tank cover that covers the upper surface of the outer tank, an inner tank that is rotatably supported in the outer tank, and an inner bottom of the inner tank A pulsator, a driving means for rotationally driving the inner tank or / and the pulsator, a means for detecting a water level by electrical conductivity or water pressure, and a liquid detergent automatic charging device provided at the top of the housing for storing and supplying the liquid detergent, A water supply valve and a water supply hose provided at the upper part of the housing for supplying water into the inner tub, and connected between the liquid detergent automatic charging device and the outer tub cover and charged with a liquid detergent between the outer tub and the inner tub. And a control means for controlling operations of the driving means, the liquid detergent automatic charging device, the water supply valve, etc., and sequentially controlling a series of steps of washing, rinsing and dehydration. The control means includes In the initial stage of the operation, the liquid detergent automatic charging device is operated to supply the liquid detergent between the outer tub and the inner tub through the detergent water supply hose. Water is supplied to a water level and the inner tub is rotated to foam and dissolve the detergent. Thereafter, the water supply valve supplies water to a predetermined water level lower than the rated water level and higher than the first predetermined water level to rotate the inner tub or the pulsator. A washing machine characterized by performing high-concentration detergent cleaning. The detergent water injection hose is flexible and has a cylindrical water injection hose connection pipe that has an annular rib formed at the tip thereof, and the water injection hose connection pipe at a connection port provided with a plurality of claws in the outer tank cover. The washing machine according to claim 1, wherein the annular rib and the claw portion are engaged with each other.

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