JP2018038443A - Washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a washing machine capable of reducing attachment of stain to a tub while securing safety.SOLUTION: The washing machine comprises: an outer tub which stores water inside and has an outer tub body and an outer tub cover; an inner tub which is supported in the outer tub in a rotatable manner and in which clothing is accommodated; a motor which rotationally drives the inner tub; water supply means which supplies water into the outer tub; and a tub cleaning nozzle which sprays water from the water supply means via a bellows part. The tub cleaning nozzle comprises a nozzle hole for spraying water toward the inside of the outer tub cover, and a pressure escape part which faces in a direction different from that of the nozzle hole and has an opening area larger than an opening area of the nozzle.SELECTED DRAWING: Figure 22

Description

  The present invention relates to a washing machine.

  In conventional washing machines, for example, a drum-type washing machine that can prevent dirt from adhering to the upper inner wall surface of the outer tub as disclosed in JP 2013-70720 A (Patent Document 1) has become mainstream. ing.

JP2013-70720A

  In order to prevent the above-mentioned contamination, the flow rate of water to be supplied from the nozzle on the outer tank cover side is large and the piping pressure is high. It was common.

  However, hoses such as PVC hose have low elasticity, and once the hose is bent, the flow of water in the hose is blocked. It has become.

  In the above problem, for example, it may be possible to adopt a hose having a bellows shape, but the bellows part is made of a rubber material or has a thin wall thickness in order to have stretchability and bending resistance. Therefore, if a high water pressure is applied, the bellows part may swell or burst, and there is a possibility that it cannot be used safely.

  Then, an object of this invention is to provide the washing machine which can reduce dirt adhesion of a tank, ensuring safety | security.

  The present invention includes, as an example, an outer tub that stores water therein and has an outer tub main body and an outer tub cover, an inner tub that is rotatably supported in the outer tub, and stores clothes. A motor for rotationally driving the tank, a water supply means for supplying water into the outer tank, a tank cleaning nozzle for sprinkling water from the water supply means via a bellows portion, and the tank cleaning nozzle on the inside of the outer tank cover And a pressure relief portion that faces in a direction different from the nozzle hole and has an opening area larger than the opening area of the nozzle.

  ADVANTAGE OF THE INVENTION According to this invention, the washing machine which can reduce dirt adhesion of a tank can be provided, ensuring safety | security.

It is a perspective view which shows the external appearance of the drum type washing machine which concerns on 1st Embodiment. It is a side view which shows the internal structure of the drum type washing machine which concerns on 1st Embodiment. It is a perspective view which shows the internal structure of the drum type washing machine which concerns on 1st Embodiment. It is a rear view which shows the internal structure of the drum type washing machine which concerns on 1st Embodiment. It is a perspective view which shows the connection state of a water supply solenoid valve, a washing water supply hose, and a drainage hose. It is a longitudinal cross-sectional view of an outer tank water supply joint. It is a side view which shows the positional relationship of a washing water supply hose and a drainage hose. It is a top view which shows arrangement | positioning of the outer tub cover side nozzle of the drum type washing machine which concerns on 1st Embodiment. It is the sectional view on the AA line of FIG. The single unit of an outer tank cover side nozzle is shown, (a) is a front view, (b) is a side view, (c) is a top view, and (d) is a bottom view. It is an expanded sectional view which shows the flow of the water by an outer tank cover side nozzle. It is a top view which shows typically the washing | cleaning range by the outer tank cover side nozzle. It is a block diagram which shows a drum type washing machine. It is a flowchart which shows the main control at the time of operation | movement of a drum type washing machine. It is a flowchart which shows the control in the tank cleaning process 1. 3 is a flowchart showing control in a dehydration step 1. It is a flowchart which shows the control in the tank cleaning process 2. FIG. 5 is a flowchart showing control in a dehydration step 2. It is a whole process table | surface which shows the opening / closing operation | movement of various water supply solenoid valves. It is a schematic diagram in the case of adopting a vinyl chloride hose or the like for the washing water supply hose 55. FIG. 6 is a schematic diagram when a bellows hose or the like is adopted as the cleaning water supply hose 55. It is an expanded sectional view showing the flow of water by a tank washing nozzle. (A) is the figure which looked at the tank washing | cleaning nozzle 52A from the outer tank cover 22 side. (B) is the perspective view. (A) is the figure which looked at the tank washing | cleaning nozzle 52A from the balance ring 10b side. (B) is the perspective view. (A) is the side view seen from X of (a) of FIG. 24, (b) is the side view seen from Y of (a) of FIG.

  Hereinafter, modes for carrying out the present invention (hereinafter referred to as “embodiments”) will be described in detail with reference to the drawings as appropriate. In the following description, a drum type washing machine (hereinafter referred to as a washing machine) capable of performing steps from washing to drying will be described as an example. Moreover, below, it demonstrates on the basis of the direction when the washing machine S1 is seen from the front.

(First embodiment)
As shown in FIG. 1, the washing machine S1 of the first embodiment has a casing 1 whose outer shell is configured by combining a steel plate and a resin molded product, and the casing 1 is mounted on a base 1h. It is configured. The housing 1 includes left and right side plates 1a and 1b (see FIG. 4 for 1b), a front cover 1c, a back cover 1d (see FIG. 2), an upper cover 1e, and a lower front cover 1f. The left and right side plates 1a and 1b are joined by a U-shaped upper reinforcing material (not shown), a front reinforcing material (not shown), and a rear reinforcing material (not shown), and include a base 1h. A box-shaped housing 1 is formed and has sufficient strength as a housing.

  A door 2 that closes an insertion port for putting in and out clothes (laundry, objects to be dried) is supported at a substantially center of the front cover 1c so as to be openable and closable by a hinge provided in the front reinforcing material. . A front cover 1 c in the vicinity of the door 2 is provided with a door release button 3 for releasing a lock mechanism (not shown) of the door 2. When the door release button 3 is pressed, the lock mechanism (not shown) is released and the door 2 is opened. When the door 2 is pressed against the front cover 1c, the door 2 is locked and closed. A front reinforcing material (not shown) has a circular opening for putting clothes in and out concentrically with an opening 20b (see FIG. 3) of an outer tub 20 (see FIG. 2) to be described later.

  An operation panel 4 including a power switch 4a, operation switches 4b and 4c, a display 4d, and the like is provided at the upper center of the housing 1. The operation panel 4 is electrically connected to a control device 60 (see FIGS. 2 and 3) provided at the lower part of the housing 1. Further, on the left side of the operation panel 4, a drawer-type tray 5 into which a detergent, a softening agent, or the like is charged is provided.

  In addition, on the right side of the operation panel 4, a pull-out drying filter 6 is provided. The dry filter 6 includes a mesh type filter 6a (see FIG. 3) so that lint and the like are removed. Cleaning of the dry filter 6 is performed by pulling out the dry filter 6 and taking out the mesh filter 6a (see FIG. 3). Further, the upper surface cover 1e is provided with a water supply hose connection port 7a from the water tap and a water absorption hose connection port 7b for remaining hot water in the bath.

  As shown in FIG. 2, the washing machine S <b> 1 is provided with an inner tub (rotary drum) 10 as a cylindrical washing and dewatering tub that is rotatably supported in the housing 1. The inner tub 10 has an opening 10a for putting clothes into and out of the front side (front side) end face, and has a large number of through holes 10h (see FIG. 11) for water flow and ventilation on its peripheral wall. Yes.

  A balance ring (also referred to as a fluid balancer) 10b integrated with the inner tank 10 is provided at the edge of the opening 10a. The balance ring 10b is configured by enclosing a fluid having a large specific gravity therein, and when the eccentricity occurs due to the bias of the laundry when the inner tub 10 rotates, the balance ring 10b is eccentric due to the movement of the fluid in the balance ring 10b. Has the function of canceling and maintaining the balance of rotation.

  A plurality of lifters 10 c extending in the depth direction (axial direction) are provided on the inner peripheral wall of the inner tank 10. When the inner tub 10 rotates during washing and drying, clothes and the like are lifted along the peripheral wall by the lifter 10c and centrifugal force, and are repeatedly moved by gravity. The rotation center O1 of the inner tub 10 is inclined so that the opening 10a side becomes higher.

  The washing machine S1 includes an inner tub 10 coaxially, and includes a cylindrical outer tub 20 having an open front surface. The outer tub 20 includes an outer tub body 21 and an outer tub cover 22. An opening 21s (see FIG. 11) on the front surface of the outer tub body 21 is provided with an outer tub cover 22 made of synthetic resin, which enables water to be stored in the outer tub 20. An opening 22a (see FIG. 8) for taking in and out clothes is formed at the center of the front side (front side) of the outer tub cover 22. The opening 22a and the opening provided in the front reinforcing member are connected by a rubber packing 23 (see FIG. 9). The packing 23 plays a role of maintaining the water tightness between the outer tub 20 and the door 2. This prevents water leakage during washing, rinsing and dehydration. A drain port 20 c is provided at the bottom bottom of the outer tub 20, and a drain hose 8 is connected thereto.

  The front end of the drain hose 8 is connected to a drain hole 101 provided in the floor G. In addition, a drain valve V is provided in the middle of the drain hose 8. Water is stored in the outer tub 20 by closing the drain valve V and supplying water, and opening the drain valve V in the outer tub 20. Water is discharged outside the aircraft.

  In the washing machine S1, a motor M for rotationally driving the inner tub 10 is attached to the center of the back surface (bottom surface center) of the outer tub 20. The rotating shaft m1 of the motor M passes through the outer tub 20 and is coupled to a metal flange 10e provided on the back surface of the inner tub 10. Further, the lower part of the outer tub 20 is supported by a plurality of suspensions 9 (consisting of coil springs and dampers) whose lower side is fixed to the base 1h. The upper portion of the outer tub 20 is supported by an auxiliary spring (not shown) attached to the upper reinforcing member, and is configured to prevent the outer tub 20 from falling in the front-rear direction.

  In addition, the washing machine S <b> 1 includes a blower duct (blower passage) 30 that passes through the back inner side and the upper inner surface of the housing 1. The blower duct 30 includes a duct 32 extending in the vertical direction on the back side of the outer tub 20 and a duct 33 extending on the upper surface side of the outer tub 20 from the rear to the front.

  An overflow hose 15 connected to join the drain hose 8 downstream of the drain valve V is connected to the lower portion of the duct 32. The upstream end of the hose 15 is connected so as to be positioned above the bellows 31 described later.

  A blower fan unit 40 including a fan 41 (blower unit) and a heater 42 (heater unit) is provided on the downstream side of the duct 33.

  Although not shown in the figure, a stainless steel plate (heat exchange plate) on which a large number of protrusions are formed is disposed in the duct 32 as, for example, a water-cooled dehumidifying mechanism. A water supply pipe (not shown) for flowing cooling water along is connected. Water cooling dehumidification functions by opening a cooling water supply electromagnetic valve 12d described later.

  The lower part of the air duct 30 (duct 32) is connected to the outlet 20d provided in the lower back part of the outer tub 20 by a bellows 31 having a flexible structure substantially horizontally.

  As shown in FIG. 3, the fan 41 is a so-called turbo fan or the like, and an impeller (not shown) composed of a plurality of blades is accommodated in a fan case 41a. A scroll-like (spiral) flow path (not shown) is formed around the periphery. Further, on the outer surface of the fan case 41a, an intake hole (not shown) for sucking air is formed on one surface side of the rotation center of the impeller, and an electric motor M1 for rotating the impeller at high speed is attached on the other surface side. ing.

  The heater 42 (see FIG. 2) is composed of a PTC (Positive Temperature Coefficient) heater or the like, and is provided on the downstream side of the scroll-like flow path in the fan case 41a. The fan case 41a on the downstream side of the heater 42 is formed with a discharge port (not shown) through which hot air (drying air) generated by the heater 42 is discharged.

  The duct 33 (see FIG. 2) includes a filter duct 33a. The front surface of the filter duct 33a has an opening, and the drawer-type drying filter 6 is inserted into the opening. The downstream side of the drying filter 6 is connected to an intake hole (not shown) of the blower fan unit 40, and a hot air duct 35, a bellows 36, and a hot air blowing nozzle 37 are connected to an outlet (not shown) of the blower fan unit 40. Connected in order.

  The washing machine S1 includes a circulation pump P and circulation hoses H1 and H2, and has a function of circulating the stored water in the outer tub 20. The circulation pump P is disposed below the outer tub 20, its introduction port is connected to the bottom of the outer tub 20 via the circulation hose H1, and the outlet port is connected to the side of the outer tub cover 22 via the circulation hose H2. It is connected. Thereby, the water stored in the outer tub 20 is pumped up by the circulation pump P, and water is sprinkled on the upper part of the laundry in the outer tub 20.

  As shown in FIG. 4, at the rear of the tray 5 (see FIG. 1), a water supply unit 12 (water supply means) having five water supply electromagnetic valves T, a bath water supply pump U, a water supply path unit (not shown), and the like. ) Is provided. The five water supply electromagnetic valves T are a detergent water supply electromagnetic valve 12a, a finishing agent water supply electromagnetic valve 12b, an outer tank water supply electromagnetic valve 12c, a cooling water supply electromagnetic valve 12d, and a tank cleaning water supply electromagnetic valve 12e (water supply means). And.

  The detergent water supply solenoid valve 12a supplies tap water from the water supply hose connection port 7a to a detergent charging chamber (not shown) of the tray 5 (see FIG. 3) through a water supply path (not shown). The tap water poured into the detergent charging chamber is poured into the outer tub 20 through a charging hose (not shown) together with the charged detergent.

  The finishing agent water supply electromagnetic valve 12b supplies tap water from the water supply hose connection port 7a to a finishing agent charging chamber (not shown) of the tray 5 (see FIG. 3) through a water supply path (not shown). The tap water poured into the finishing agent charging chamber is poured into the outer tub 20 through a charging hose (not shown) together with the charged finishing agent.

  The outer tank water supply electromagnetic valve 12c supplies tap water from the water supply hose connection port 7a into the outer tank 20 through a water supply path (not shown) from a water injection hose (not shown).

  The cooling water supply electromagnetic valve 12d supplies tap water from the water supply hose connection port 7a to a water cooling / dehumidification mechanism (not shown) of the air duct 30 (see FIG. 2) through a water supply path (not shown).

  The tank cleaning water supply electromagnetic valve 12e passes the tap water from the water supply hose connection port 7a through a water supply path (not shown) and the outer tank cover side nozzle 50A (described later) through the cleaning water supply hose 55 (cleaning water supply piping). Water is supplied to the water channel member.

  In addition, the bath water from the water absorption hose connection port 7b pumped up by the bath water feed pump U is supplied into the outer tub 20 from a water injection hose (not shown) through a water supply path (not shown).

  As shown in FIG. 5, the five water supply solenoid valves T are arranged on the upper left side of the outer tub 20. FIG. 5 shows a state where only five water supply electromagnetic valves T are extracted from the water supply unit 12 (see FIG. 4).

  A branch joint 54 is connected to a discharge port (not shown) of the tank cleaning water supply electromagnetic valve 12e via a seal member (such as an O-ring) (not shown), and one end of a cleaning water supply hose 55 is connected to the tip of the branch joint 54. A drainage hose 56 (drainage pipe) is connected to the side surface (circumferential surface) of the branch joint 54.

  The cleaning water supply hose 55 extends forward along the outer tub main body 21, extends so as to be bent in the center in the left-right direction at the position of the outer tub cover 22, and is provided at the apex (center) of the outer tub cover 22. Further, it is connected to a water supply port 51f1 (see FIG. 8) described later via a seal member (not shown).

  The drain hose 56 extends downward from the branch joint 54 and extends while being bent backward, and is connected to the outer tank water supply joint 24 provided at the rear portion of the outer surface of the outer tank 20 (outer tank main body 21). The outer tank water supply joint 24 is connected to a case communicating with a detergent charging chamber (not shown) and a finishing agent charging chamber (not shown) of the tray 5 via a bellows hose (not shown).

  As shown in FIG. 6, the outer tank water supply joint 24 is configured by assembling a joint 24 a connected to the outer tank body 21 and a joint 24 b connected to the bellows hose in an L shape in a side sectional view. Yes. A rubber check valve 24c is provided at the boundary between the flow path constituted by the joint 24a and the flow path constituted by the joint 24b. The check valve 24c only allows fluid to flow from the joint 24b-side flow path to the joint 24a-side flow path, and steam generated in the outer tub 20 during a drying process described later is generated in the joint. The flow from 24a to the joint 24b is blocked.

  The drain hose 56 is connected to the upper part of the joint 24a. The joint 24a is formed with a cylindrical hose connection portion 24a1 to which the drainage hose 56 is connected. A drain hole 24a2 communicating with the flow path inside the joint 24a is formed at the bottom of the hose connection portion 24a1. The drain hole 24a2 corresponds to an outlet to which a drain hose 56 (drain pipe) is connected. The size of the drain hole 24a2 will be described later.

  As shown in FIG. 7, the cleaning water supply hose 55 and the drainage hose 56 are located above the drainage hose 56 in the vertical direction (vertical direction). As a result, the residual water in the cleaning water supply hose 55 is discharged into the outer tub 20 through the drainage hose 56, thereby preventing the cleaning water supply hose 55 from being blocked by freezing of the residual water.

  That is, if the drain hose 56 is not provided, and the tank cleaning water supply electromagnetic valve 12e and the outer tank cover side nozzle 50A described later are directly connected via the cleaning water supply hose 55, the outer tank cover side When cleaning water is supplied from the nozzle 50A and the tank cleaning water supply solenoid valve 12e is closed, the flow of cleaning water in the outer tank cover side nozzle 50A and the cleaning water supply hose 55 stops, and the outer tank cover side nozzle 50A is scattered. Wash water is not discharged from the water port 50b2. Therefore, in the present embodiment, the drainage hose 56 is branched from the cleaning water supply hose 55, and the cleaning water supply hose 55 is disposed above the drainage hose 56 in the vertical direction. It is possible to prevent the cleaning water from remaining in the supply hose 55.

  As shown in FIG. 8, on the front side of the outer tank cover 22, an outer tank cover side nozzle 50A for spraying tap water (cleaning water) for tank cleaning is provided. The outer tank cover side nozzle 50 </ b> A is formed of a synthetic resin or the like, has a substantially arcuate shape (arc shape), and is provided in the upper part of the outer tank cover 22. The outer tank cover side nozzle 50A is formed with a length of about one quarter of the circumference, and extends from the center to the left and right with the same length. In addition, a water supply port 50f1 to which a cleaning water supply hose 55 (see FIG. 7) is connected is formed in the central portion of the outer tank cover side nozzle 50A in the circumferential direction, and penetrates the outer tank cover 22 so as to penetrate the outer tank cover. 22 protrudes outside. A seal member (not shown) such as an O-ring is provided at the boundary between the outer tub cover 22 and the water supply port 50f1 so that water does not leak.

  As shown in FIG. 9, the shape of the outer tank cover 22 to which the outer tank cover side nozzle 50 </ b> A is attached has a large diameter portion 22 b connected to the opening 21 s (FIG. 11) of the outer tank main body 21 (see FIG. 11), The large-diameter portion 22b includes an inclined portion 22c that is reduced in diameter toward the front side (front), and a front surface portion 22d that extends in a substantially vertical direction with respect to the inclined portion 22c. Further, a convex portion 22e to which the packing 23 is attached is formed on the front surface portion 22d so as to protrude forward. The outer tank cover side nozzle 50 </ b> A is disposed at the front end of the large diameter portion 22 b of the outer tank cover 22.

  As shown in FIG. 10 (a), a plurality (15 in this embodiment) of water spray ports 50b2 are formed on the front surface 50d of the outer tank cover side nozzle 50A at intervals in the circumferential direction. Moreover, the hole diameter (diameter) of the water spray port 50b2 is formed to be 1.2 mm, for example. Note that the number, position, and hole diameter of the water spout 50b2 are not limited to the present embodiment, and can be changed as appropriate.

  As shown in FIGS. 10B and 10C, a plurality of mounting portions 51A are formed on the upper surface 50e of the outer tank cover side nozzle 50A so as to protrude rearward from the upper surface 50e at intervals in the circumferential direction. ing. The mounting portion 51A has a rectangular piece 51a, and is configured by forming a screw insertion hole 51b in the piece 51a. Each attachment portion 51A is formed so as to be flush with the upper surface 50e, and a screw (not shown) is inserted into the insertion hole 51b and is screwed to the inner wall surface 22b1 of the outer tank cover 22.

  As shown in FIG. 10D, a water spray port 50a2 is formed on the bottom surface 50f of the outer tank cover side nozzle 50A at a position corresponding to the water supply port 50f1. In the present embodiment, only one water spout 50a2 is provided, but it may be provided at a plurality of locations.

  In addition, the cross-sectional area (flow-path cross-sectional area) of the drain hole 24a2 is 1 with respect to the total cross-sectional area (total flow-path cross-sectional area) of 15 sprinkling ports 50a2 of the outer tank cover side nozzle 50A and one 50b2. It is preferable to set to 10%. By setting to such a ratio, the water draining function can be sufficiently exhibited. In addition, for the purpose of suppressing the flow rate on the outer tank cover side nozzle 50A side, the number and the hole diameter of the water spray ports 50a2 and 50b2 may be set to be larger than 10%.

  As shown in FIG. 11, the outer tank cover side nozzle 50 </ b> A is disposed between the outer tank cover 22 (outer tank 20) and the side surface (circumferential surface) of the inner tank 10. More specifically, the inner tank 10 has a throttle portion 10d having a reduced diameter at the front end, and the outer tank cover side nozzle 50A is positioned between the large diameter portion 22b of the outer tank cover 22 and the throttle portion 10d. doing. A balance ring 10b is attached to the inner peripheral edge of the throttle portion 10d.

  In the washing machine S1 provided with the outer tub cover side nozzle 50A in this manner, as shown by the solid line arrow R1 in FIG. 11, the washing water is discharged forward from the water spray port 50b2, and the inclined portion 22c of the outer tub cover 22 is It hits the inner wall surface 22c1 and flows downward along the inner wall surface 22c1.

  More specifically, the cleaning water discharged from the water spray port 50b2 is discharged linearly, hits the inner wall surface 22c1, and after hitting, spreads radially around the position. The washing water sprayed on the inner wall surface 22c1 flows down the inner wall surface 22c1 of the inclined portion 22c of the outer tub cover 22 and the inner wall surface 22d1 of the front surface portion 22d by the action of gravity.

  Moreover, the washing water discharged from the water spray port 50a2 hits the throttle portion 10d of the inner tank 10 as indicated by the solid line arrow R2. The washing water sprayed on the throttle part 10d is scattered on the inner wall surface 22b1 of the large diameter part 22b of the outer tank cover 22 (outer tank 20) by the centrifugal force when the inner tank 10 rotates, and is behind the throttle part 10d. The outer tank cover 22 and the outer tank 10 s are scattered on the outer peripheral surface 10 s of the inner tank 10. In addition, although there is one sprinkling port 50a2 sprayed to the inner tub 10 side, it is possible to spray the entire peripheral surface of the throttle portion 10d of the inner tub 10 by sprinkling water while rotating the inner tub 10. Become. In this way, the amount of water used can be reduced by blowing away tap water by centrifugal force and washing the inside of the outer tub cover 22 as compared with the case where the tap water is blown and washed.

  As shown in FIG. 12, when the cleaning water discharged from the respective water spouts 50b2 (see FIG. 10) of the outer tank cover side nozzle 50A to the front (inner wall surface 22b1) of the outer tank cover 22 is scattered radially, In the horizontal direction perpendicular to the vertical direction (gravity direction), the washing water from the adjacent water spouts 50b1 overlap each other. Thereby, when washing water flows down, the area where the washing water does not flow can be eliminated on the inner wall surfaces 22c1 and 22d1 of the outer tub cover 22, and dirt can be prevented from remaining in the form of vertical stripes. .

  In addition, the number, the hole diameter, and the position of the water spout 50b1 of the outer tank cover side nozzle 50A described above may be set so that the cleaning water flows over the entire inner surface of the outer tank cover 22, as described with reference to FIG. For example, the number, hole diameter, and position can be changed as appropriate.

  Next, operation | movement of washing machine S1 of this embodiment is demonstrated. First, the overall configuration of the washing machine S1 of the present embodiment will be briefly described. As shown in FIG. 13, the control device (microcomputer) 60 includes a CPU (Central Processing Unit), a ROM (Read Only Memory) storing a program, a RAM (Random Access Memory), an input / output circuit, and the like. The operation button input circuit 62 connected to the switches 4b and 4c, the water level sensor 63, the temperature sensor 64, and the vibration sensor 65 are connected to acquire various information signals in the user's button operation, washing process, and drying process. The temperature sensor 64 includes an outside temperature sensor that detects the outside temperature, a temperature sensor that detects the temperature of the drain port 20c, and the like.

  In addition, the control device 60 controls the water supply solenoid valves 12 a to 12 e, the bath water supply pump U, the drain valve V, the rotation speed of the motor M (the rotation speed of the inner tub 10), and the fan 41 through the drive circuits 66. The rotation speed and the energization (ON / OFF) of the heater 42 are controlled. The control device 60 controls the display 4d, the light emitting diode 67, and the buzzer 68 for notifying the user of the operating state of the washing machine S1.

  The control device 60 is activated when the power switch 4a is pressed and the power is turned on, and executes, for example, a basic control processing program for washing and drying shown in FIGS. In the following, a case where a series of operations from washing to drying is performed will be described with reference to FIGS.

  As shown in FIG. 14, the control device 60 performs a washing process (step S100), a rinsing process (step S200), a tank cleaning process 1 (step S300-1), a tank cleaning process 2 (step S300-2), and a dehydration process. (Step S400) and a drying process (Step S500) are performed in order.

  As shown in FIG. 17, in the cloth amount sensing step (S100-1) of the washing step (S100), the control device 60 rotates the inner tub 10 and calculates the amount of cloth for the clothes before water injection. Note that the weight of the clothes in the inner tub 10 can be calculated based on the rotation speed of the motor M and the current value. Since the load for rotating the inner tub 10 increases due to the increase in the weight of the clothing and a large amount of motor current is required to flow through the motor M, the weight of the clothing is calculated from the motor current and the rotation speed of the motor M. be able to. In addition, 25-45 rpm of the tank rotational speed shown in the table | surface of FIG. 17 is a rotational speed at the time of inner tank rotation (except the time of spin-drying | dehydration).

  In the detergent dissolving water supply step (S100-2), the control device 60 opens the detergent water supply electromagnetic valve 12a and supplies tap water to the detergent charging chamber (not shown) of the tray 5. The tap water poured into the tray 5 is poured into the outer tub 20 through the bellows hose (not shown) and the outer tub water supply joint 24 while dissolving the detergent. The controller 60 closes after a predetermined time has elapsed since the detergent water supply solenoid valve 12a was opened.

  In the rotary water supply step (S100-3), the control device 60 drives the circulation pump P while rotating the inner tub 10 while maintaining the opening of the detergent water supply electromagnetic valve 12a, thereby washing water (high concentration). The detergent solution is circulated and water is supplied to the clothes while spraying the washing water. Here, the inner tub 10 is rotated at a predetermined rotational speed. Moreover, the control apparatus 60 closes the detergent water supply solenoid valve 12a after completion | finish of rotation water supply.

  In the pre-washing step (S100-4), the control device 60 washes the clothes with a high concentration detergent solution.

  In the cloth quality sensing step (S100-5), the control device 60 calculates the weight of the clothing containing water. Then, the control device 60 determines the cloth quality (water absorption) of the clothes from the weight of the clothes calculated in the cloth amount sensing step (1) and the weight of the clothes including water calculated in the cloth quality sensing step (5). Determine. The following steps are executed according to the determined cloth quality of the clothing.

  In the replenishing water step (S100-6), the control device 60 adjusts the weight of the clothing calculated in the cloth amount sensing step (1) and the clothing quality of the clothing determined in the fabric quality sensing step (5). The water supply electromagnetic valve 12 c and the tank cleaning water supply electromagnetic valve 12 e are opened to supply water into the outer tank 20. For example, if it is a thing with high water absorption, such as towel cloth, wash water is replenished in a replenishment water process. In addition, after the end of water supply, the control device 60 closes the outer tank water supply electromagnetic valve 12c and the tank cleaning water supply electromagnetic valve 12e. In this replenishing water process, by opening the tank cleaning water supply electromagnetic valve 12e, the cleaning water is sprinkled from the outer tank cover side nozzle 50A, and the upper part of the outer tank cover 22 and the inner tank 10 of the inner tank 10 are washed in the previous washing process. The detergent component adhering to the front end side surface can be poured.

  In the main washing step (S100-7), the control device 60 washes the clothes while rotating the inner tub 10 in both forward and reverse directions. When the main washing is completed, the unbalanced state of the clothing is monitored to determine whether or not to shift to dehydration.

  In the rinsing process in step S200, one rinsing process and two rinsing processes are executed. That is, in the draining process (S200-1) of the rinse 1, the control device 60 opens the drain valve V and drains the washing water in the outer tub 20. The end of drainage is determined based on the detection value of the water level sensor.

  In the dehydration step (S200-2), after the drainage is completed, the control device 60 rotates the inner tub 10 at a high speed to dehydrate the wash water contained in the clothes. In addition, the rotational speed of the inner tank 10 at the time of dehydration is set to 1000 rpm or more, for example.

  In the rotary shower step (S200-3), the control device 60 closes the drain valve V, opens the outer tank water supply electromagnetic valve 12c, and supplies rinse water to the outer tank 20. Further, while the inner tub 10 is rotated, the circulation pump P is driven to spray the rinse water on the clothes in the inner tub 10.

  In the dehydration step (S200-4), the control device 60 stops the circulation pump P while rotating the inner tub 10 at a high speed to dehydrate the rinse water from the clothes.

  In the rotary shower step (S200-5), the control device 60 drives the circulation pump P again while rotating the inner tub 10, and sprays rinse water on the clothes in the inner tub 10.

  In the draining step of rinsing 2 (S200-6), the control device 60 stops the inner tank 10 and the circulation pump P, opens the drain valve V, and drains the rinsing water in the outer tank 20.

  In the dehydration step (S200-7), the control device 60 dehydrates water (rinse water) contained in the clothing by rotating the inner tub 10 at a high speed after the drainage is completed.

  In the water supply step (S200-8), the control device 60 closes the drain valve V, opens the tank cleaning water supply electromagnetic valve 12e, and supplies rinse water to the outer tank 20. The control device 60 closes the tank cleaning water supply electromagnetic valve 12e after the end of water supply. In the water supply process, the tank cleaning water supply electromagnetic valve 12e is opened to supply water, so that dirt attached to the upper part of the outer tank cover 22 and the like can be poured during the rinsing process.

  In the finishing agent water supply step (S200-9), the control device 60 opens the finishing agent water supply electromagnetic valve 12b and supplies the outer tub 20 with rinse water containing the finishing agent. The control device 60 closes the finishing agent water supply electromagnetic valve 12b after finishing the finishing agent water supply.

  In the rotary water supply / replenishment water process (S200-10), the control device 60 opens the outer tank water supply electromagnetic valve 12c and the tank cleaning water supply electromagnetic valve 12e to supply rinse water into the outer tank 20. In addition, when clothes with high water absorption are thrown in and water supply amount is insufficient, rinse water is replenished. In addition, the control device 60 rotates the inner tub 10 while rinsing water is accumulated in the outer tub 20 to rinse the clothes. In addition, the rotational speed of the inner tank 10 at this time is set to 35-45 rpm.

  In step S301, the control device 60 rotates the inner tub 10 at a rotational speed higher than the rotational speed (for example, 25 rpm) during the washing process and lower than the rotational speed (for example, 1000 rpm) during the dehydration process. The rotation speed is set to 80 to 300 rpm, for example. However, the rotational speed is not particularly limited to the above range, and is not limited to the above range as long as the inside of the washing tub (the inner tub 10 and the outer tub 20) can be sufficiently cleaned. For example, the upper limit can be appropriately changed according to the maximum possible output (maximum load) of the motor M. Further, the lower limit can be appropriately changed according to the shape of the inner tub 10 (whether or not it is a shape in which water is easily rolled up). That is, when it is a shape which can easily wind up water, water can be sufficiently wound up even at a lower rotational speed.

  In step S301, the control device 60 rotates clockwise at 100 rpm as the first tank cleaning rotational speed. The tank cleaning process 1 is a provisional cleaning process that mainly removes large dirt at the bottom of the tank, and therefore, rinse water is used instead of fresh water, and the rotation speed of the inner tank 10 is reduced. Is set. In addition, the water level at this time is the same water level (first tank washing water level) as that after the rotation water supply / replenishment water process (S200-10), and the amount of clothes Although it differs depending on the water level, the water level is 11.5 liters (first tank washing water amount) at the maximum. Then, the inner tub 10 rotates, and the wash water (tap water) stored in the bottom of the outer tub 20 is rolled up, so that the inner left side area or inner tub of the outer tub 20 on the side where the water is rolled up The left half area of 10 is mainly cleaned. Washing water is sprayed from the through holes 10h formed on the side surface of the inner tub 10 to the side surface (circumferential surface) inside the outer tub 20 for cleaning.

  Proceeding to step S302, the control device 60 determines whether or not a predetermined time has elapsed since the inner tank 10 was rotated to the right by a timer (not shown). The predetermined time is not particularly limited, and is set to 60 seconds, for example. In step S302, when it is determined that the predetermined time has not elapsed, the control device 60 returns to step S301, and when it is determined that the predetermined time has elapsed, the control device 60 proceeds to step S303.

  In step S303, the control device 60 rotates the inner tank 10 counterclockwise at 100 rpm. As a result, the cleaning water stored in the outer tub 20 is rolled up as in the case of the right rotation, and the right half area inside the outer tub 20 and the right half area of the inner tub 10 are mainly washed. . In this way, by rotating the inner tub 10 clockwise and counterclockwise, it is possible to prevent occurrence of bias in the area to be cleaned.

In step S304, the control device 60 determines whether or not a predetermined time has elapsed since the inner tub 10 was rotated counterclockwise by a timer (not shown). The predetermined time is not particularly limited, and is set to 60 seconds, for example, as described above. In step S304, when it is determined that the predetermined time has not elapsed, the control device 60 returns to step S303, and when it is determined that the predetermined time has elapsed, the control device 60 proceeds to step S305.

  In step S305, the control device 60 maintains the rotation of the inner tub 10 (left rotation, 100 rpm) as it is. Then, the drain valve is opened, and the process proceeds to the dehydration step 1 shown in FIG.

  As shown in FIG. 16, in step S <b> 401, the control device 60 opens the discharge valve V while maintaining the rotation of the inner tank 10. Thereby, the used washing water in the outer tank 20 used in the tank washing process is discharged out of the machine through the drainage hose 8.

  By executing the tank cleaning step in this manner, the entire dirt and dust in the washing tub (inner tub 10 and outer tub 20) are removed, and the adhesion of dirt and trash is suppressed during the next operation. Can do.

  In the dehydration process 1, the control device 60 determines whether or not the drainage is completed in step S401 in a state where the rotation speed of the inner tank 10 is maintained. Whether or not the drainage is completed can be determined based on the detection value of the water level sensor 63. In step S401, when it is determined that drainage is not completed (No), the control device 60 repeats step S401, and when it is determined that drainage is completed (Yes), the control device 60 proceeds to step S402. The rotation speed of the tank 10 is increased. And it progresses to the tank cleaning process 2 shown in FIG.

  In the operation of the tank cleaning process 2, first, in step S306, the dehydration rotation speed is increased, and the rotation speed of the inner tank 10 is set to about 380 rpm. At this time, after confirming the degree of dehydration with the conductivity sensor and detecting that the moisture contained in the clothing has decreased to a certain level, the rotational speed of the inner tub 10 is reduced (step S307). In addition, although the electrical conductivity sensor in this embodiment is not shown in figure, it is comprised with a pair of electrode which mutually faces, and it is possible to measure the hardness of the water between these electrodes. Moreover, since this electrical conductivity sensor is arrange | positioned near the lower side surface of the outer tub 20, even if it is in the state where drainage progressed and the water in the washing tub became little, it can detect a dehydration degree with sufficient sensitivity.

  As described above, after the dehydration state is detected by the conductivity sensor, the rotation speed of the inner tank 10 is reduced to about 240 rpm, which is the second tank cleaning rotation speed, and the tank cleaning operation is started (step S308). Since this second tank cleaning rotation speed 240 rpm is higher than the rotation speed of the inner tank 10 in the tank cleaning process 1, water can be pumped up to a high place that cannot be reached in the tank cleaning process 1. In step S308, the control device 60 closes the drain valve, opens the tank cleaning water supply electromagnetic valve 12e, and stores cleaning water in the outer tank 20. The rotational speed of the inner tank 10 is maintained at 240 rpm even when cleaning water is stored. The time for storing the washing water varies depending on the tap water pressure. The tap water pressure is determined based on the relationship between the initial water supply amount and time, the water supply time that matches the water pressure is selected, and water is supplied by time control. Here, by supplying about 7 liters of washing water as the second tank washing water amount, water is accumulated up to a second tank washing water level of about 25% of the bottom height of the inner tank 10. This is because, under the condition where the rotation speed of the inner tank 10 is 240 rpm, the cleaning water can flow over the entire inner surfaces of the outer tank 20 and the outer tank cover 22 if the amount of the cleaning water is about 7 liters.

  By this operation, the water accumulated in the lower part of the outer tub 20 is lifted up by irregularities such as dewatering holes existing outside the inner tub 10 and lifts so as to hit the bottom and side surfaces of the outer tub 20, and the tank cleaning process 1 Wash away dirt that cannot be removed with Further, the dust on the upper part of the outer tub 20 and the upper part of the outer tub cover 22 that adheres in the drying process can also be washed away by the tub cleaning process 2. In addition, unlike the rinse water in the tank cleaning step 1, since fresh water is used, it is possible to prevent adhesion of powder stains and the like.

  In step S308, an operation of supplying water from the tank cleaning water supply electromagnetic valve 12e to the outer tank cover side nozzle 50A via the cleaning water supply hose 55 is also performed. Then, water is discharged from a water spray port 50b2 provided on the front surface 50d side of the outer tank cover side nozzle 50A, water is applied to the inner wall surface of the outer tank cover 22, and provided on the bottom surface 50f side of the outer tank cover side nozzle 50A. Water is discharged from the water sprinkling port 50 a 2 and water is applied to the side wall surface of the inner tank 10. The water sprayed on the side wall surface of the inner tub 10 scatters outward in the circumferential direction due to the centrifugal force generated by the rotation of the inner tub 10, and reaches the inner wall surface behind the outer tub cover 22 and the outer wall surface of the inner tub 10.

  As described above, in the present embodiment, using the shower sprayed by the outer tank cover side nozzle 50A, it is difficult for dirt to remain inside the outer tank cover 22 and the like. About the area | region near the inner wall surface in the high position of 20 back, as above-mentioned, the adhesion of dirt is prevented by raking the water collected by the lower part of the outer tank 20 upwards.

In the present embodiment, the second tank cleaning rotational speed is 240 rpm, which is higher than the first tank cleaning rotational speed, and the second tank cleaning water amount is 7 liters, but the present invention is not limited to this. That is, if the second tank cleaning rotational speed is higher, it is sufficient that the second tank cleaning water level is lower, and if the second tank cleaning rotational speed is lower, the second tank cleaning water level needs to be higher. There is.

Therefore, when the second tank cleaning water amount and the second tank cleaning rotation speed were changed to other conditions and the effect of the tank cleaning was verified, the following results were obtained. First, when the amount of water is 4 liters and the rotational speed is 450 rpm, almost no water has reached the upper part of the outer tub cover 22, but when the amount of water is 5 liters and the rotational speed is 400 rpm, the upper part of the outer tub cover 22 is constant. The water arrived. In addition, when the amount of water is 6 liters and the rotation speed is 330 rpm, the area of the inner surface of the outer tub cover 22 is sprinkled, and when the water amount is 7 liters and the rotation speed is 240 rpm, the water amount is 8 liters and the rotation speed is In the case of 200 rpm, and when the amount of water was 9 liters and the rotational speed was 160 rpm, the inner surface of the outer tub cover 22 could be washed out evenly and uniformly. Furthermore, when the amount of water is 10 liters and the number of revolutions is 160 rpm, and when the amount of water is 11.5 liters and the number of revolutions is 130 rpm, the inner surface of the outer tub cover 22 can be washed away, but some of the water Overflow.

  Accordingly, at least 5 liters of water is necessary to obtain the tank cleaning effect, and 7 liters or more is necessary to obtain a high tank cleaning effect, but it is 9 liters or less in consideration of water saving. It is desirable. On the other hand, as for the number of rotations, if the amount of water is increased to 11.5 or more without considering water saving, the effect of washing the tank can be obtained at 130 rpm or more. However, if the rotation speed is the same as the primary resonance point around 150 rpm and the third resonance point around 300 rpm to 400 rpm, vibration may increase, so avoid them and change the rotation speed from 160 rpm to around 300 rpm. Also good. Furthermore, if around 200 rpm is avoided, the occurrence of a secondary resonance point can be prevented. Therefore, it can be seen that when the amount of water is 7 liters and the rotational speed is 240 rpm, water can be saved and the effect of washing the tank can be kept high.

  In the present embodiment, a combination of a shower by the outer tank cover side nozzle 50A and a scooping of water accumulated in the outer tank 20 is a method for automatically washing away sebum dirt and detergent residue. Even if the shower by the tank cover side nozzle 50A is not used, the effect of washing away dirt and the like can be expected to some extent. In that case, the water supply into the outer tub 20 in step S308 may use a water supply valve other than the tank cleaning water supply electromagnetic valve 12e. However, if the operation is performed with a valve having a small water supply flow rate, such as the finishing agent water supply electromagnetic valve 12b and the cooling water supply electromagnetic valve 12d, the water supply time increases, resulting in a longer operation time. 12a and the outer tank water supply electromagnetic valve 12c are desirable.

  Further, the dirt most likely to remain in the tank is the bottom surface inside the outer tank 20, and there is a possibility that a water line is generated near a certain water level. This water line is dirt which adheres in the washing process and the rinsing process, and is difficult to flow down even in the subsequent tank cleaning operation. Therefore, in the present embodiment, in order to drop the water line, the mechanical force of the water scraping portion 70 formed by providing a protrusion on the back surface of the inner tank 10 is used. This water scraping portion 70 has a shape extending in the radial direction in the vicinity of the outer peripheral side of the flange on the bottom surface of the inner tub 10, and when it hits the water surface, a water flow is generated, and a water line can be dropped by applying a strong force. It becomes. Instead of providing the water scraping portion 70, a method of separately providing a nozzle for spraying water between the back surface of the inner tub 10 and the bottom surface of the outer tub 10 is also conceivable.

  Next, when sufficient cleaning water is supplied into the tank, the tank cleaning water supply electromagnetic valve 12e is closed in step 309, but the second tank cleaning rotation speed of the inner tank 10 is maintained as it is (30 seconds). ), Continuing to scoop up the water accumulated in the outer tub 20 and preventing the occurrence of bias in the area to be cleaned. In this embodiment, the inner tank 10 is rotated only in one direction at the second tank cleaning rotation number so as not to increase the operation time. However, the rotation direction is reversed after a predetermined time has elapsed, or these are repeated a plurality of times. It is also possible to control to reduce washing unevenness.

  In subsequent step S311, the drainage valve is opened to drain the wash water while maintaining the rotation speed of the inner tank 10. Since the water is drained while maintaining the rotation speed, the washing water containing dirt can be drained without touching the clothes.

  When the drainage of the cleaning water is completed, the drain valve is closed again, the tank cleaning water supply electromagnetic valve 12e is opened again, and about 2.5 liters of tap water is supplied (step S313). This 2.5 liter cleaning water amount (third tank cleaning water amount) is not increased to the entire inside of the outer tank cover 22 under the condition that the rotation speed of the inner tank 10 is 240 rpm (the same as the second tank cleaning water amount). Although it is difficult to spread, the amount is such that washing water can flow over the entire inner bottom surface of the outer tub 20. As described above, since the bottom surface inside the outer tub 20 where dirt easily adheres is repeatedly washed with clean water, the dirt can be surely removed. In addition, since the amount of water used at this time is smaller than the amount of the second tank washing water, it also leads to water saving. In addition, also in this step S313, water is supplied from the tank cleaning water supply electromagnetic valve 12e to the outer tank cover side nozzle 50A to spray the outer tank cover 22 and the like.

  Next, when sufficient cleaning water is supplied into the tank, the tank cleaning water supply electromagnetic valve 12e is closed in step S314, but the tank cleaning rotation speed of the inner tank 10 is maintained as it is (30 seconds). When a predetermined time has elapsed (step S315), the drainage valve is opened to drain the wash water while maintaining the rotation speed of the inner tank 10 (step S316). Thus, the effect of tank cleaning is improved by switching the second tank cleaning water amount and the third tank cleaning water amount and using clean water.

  Further, the process proceeds to the dehydration step 2 shown in FIG. In step S403, when drainage is completed, the final dehydration process is performed for a predetermined time, and then the process proceeds to the drying process (S500) with the drain valve V open. Then, when the operation of the drying step S500 ends, the drain valve V is closed.

  Thus, when shifting from the tank cleaning process (S300) to the dehydration process (S400), the operation time can be shortened by shifting to the dehydration process while maintaining the rotation of the inner tank 10. That is, if the rotation of the inner tub 10 is stopped before the dehydration step, it is necessary to increase the rotation speed while balancing the inner tub 10 when starting the dehydration step. It will take some time to increase in speed. By preventing the rotation of the inner tank 10 from being stopped in the tank cleaning step as in the present embodiment, the above-described balancing time can be omitted, and the operation time can be shortened.

  In the drying step (S500), the control device 60 opens the cooling water supply electromagnetic valve 12d, energizes the heater 42, and drives the fan 41. Thereby, the steam generated from the clothing is removed (dehumidified) by a water-cooled dehumidifying member (not shown), heated by the heater 42, and then returned to the inner tub 10 as dry air.

  In the drying step, the tank may be washed to remove dust adhering in the drying operation. In addition, the process which confirms that there is no clothing remaining in the inner tank 10 is performed. For example, the user can open the door 2, take out clothes, close the door 2, and press a predetermined button (for example, a start button) to start the tank cleaning process. Incidentally, since no clothes are put in, the inner tub 10 can be rotated at a high speed, can be rotated with a small amount of water, and water saving performance can be enhanced.

  As explained above, in the washing machine S1, in the upper part in the outer tub cover 22 (outer tub 20), the outer tub cover 22 (outer tub 20) and the narrowed portion 10d of the inner tub 10 (side surface of the front end of the inner tub). Since the outer tank cover side nozzle 50A (water channel member) is provided for the cleaning water supplied from the tank cleaning water supply electromagnetic valve 12e (water supply means) via the cleaning water supply hose 55, the outer tank cover 22 It is possible to remove dirt and dust adhering to the inner surface of the tank and the front surface of the inner tub 10, and to keep the washing tub (inner tub 10 and outer tub 20) clean by washing before the dirt and trash accumulate. It becomes possible. By suppressing the adhesion of dirt and dust in this way, it is possible to suppress the growth of mold and the generation of off-flavors. Furthermore, it is possible to prevent or suppress dust from adhering to the laundry being washed.

  Further, in the present embodiment, the drain hose 56 is branched and connected to the cleaning water supply hose 55, and the cleaning water supply hose 55 is disposed above the drain hose 56 in the vertical direction. It is possible to prevent the cleaning water from remaining in the water supply hose 55. Thereby, it is possible to prevent the washing water supply hose 55 from being blocked by freezing, and it is possible to prevent a malfunction of the washing machine S1 caused by the blocking.

  Moreover, since the branch part of the washing water supply hose 55 and the drainage hose 56 is configured to be located in the vicinity of the tank washing water supply electromagnetic valve 12e, the washing water remaining in the washing water supply hose 55 can be reduced as much as possible. .

  Moreover, since the dedicated tank cleaning water supply electromagnetic valve 12e is provided, the function at the time of tank cleaning is not impaired. The cleaning water supply hose 55 is not limited to the configuration connected to the dedicated tank cleaning water supply electromagnetic valve 12e, but may be configured to branch by providing a switching valve downstream of another water supply electromagnetic valve. .

  Moreover, the control apparatus 60 which controls the motor M and the tank washing water supply electromagnetic valve 12e is provided, and the control apparatus 60 controls the tank washing water supply electromagnetic valve 12e so that a predetermined amount of tap water accumulates in the outer tank 20, and the inner tank Since the motor M is controlled to rotate at a rotational speed higher than the rotational speed at the time of the washing process, the washing water stored in the outer tank 20 is not only washed by the outer tank cover side nozzle 50A. It becomes possible to perform tank washing by winding up, and it is possible to wash the entire washing tub (inner tub 10, outer tub 20).

  In the tank cleaning process 1 (S300-1) and the tank cleaning process 2 (S300-2) in the present embodiment, the washing course or the washing drying course is started in a state where the predetermined tank cleaning button is set to ON. When the washing course or the washing and drying course is started in a state where it is set to OFF, these tank washing steps are omitted and a normal washing operation or a washing and drying operation is performed. Therefore, if tank cleaning is set to on, water is automatically applied to the tank wall surface during the washing course and washing / drying course without performing a special tank cleaning course separate from the washing course and washing / drying course. It is possible to make it difficult to leave dirt.

  Next, as shown in FIG. 20, a problem in the case where a PVC hose or the like is adopted as the cleaning water supply hose 55 will be described.

  When tank cleaning is performed, the flow rate of water to be supplied from the outer tank cover side nozzle 50A is large and the piping pressure is high. Therefore, a thick hose such as a vinyl chloride hose with high water pressure resistance is adopted as the cleaning water supply hose 55. It was common.

  However, hoses such as PVC hose are low in elasticity and once the hose is bent, the flow of water in the hose is blocked. Met.

  In the present embodiment, as shown in FIG. 21, a hose having a bellows shape having stretchability and bending resistance is employed. However, since the bellows part must be made of rubber or thinned in order to have elasticity and bending resistance, the bellows part swells or bursts when high water pressure is applied. There is a possibility that it cannot be used safely.

  Therefore, in this embodiment, the tank cleaning nozzle 52A is provided with a pressure relief portion 52A-3 for pressure relief. This will be described with reference to FIGS.

  FIG. 22 is an enlarged cross-sectional view showing the flow of water by the tank cleaning nozzle 52A. Water for tank cleaning flows from the tank cleaning nozzle 52A through the outer tank cover side nozzle 50A. While water flows on the inner peripheral surface side of the outer tank cover 22, water flows on the balance ring 10b side.

  (A) of FIG. 23 is the figure which looked at the tank washing nozzle 52A from the outer tank cover 22 side. (B) is the perspective view.

  (A) of FIG. 24 is the figure which looked at the tank washing nozzle 52A from the balance ring 10b side. (B) is the perspective view.

  25A is a side view seen from X in FIG. 24A, and FIG. 25B is a side view seen from Y in FIG.

  The water from the outer tank cover side nozzle 50A passes through the passage hole 52A-1, and a part of the water flows from the nozzle hole 52A-2 provided on the front side to the inner peripheral surface side of the outer tank cover 22. Flows to clean the inner peripheral surface of the outer tub cover 22. On the other hand, the water from the passage hole 52A-1 flows toward the balance ring 10b via the pressure escape portion 52A-3. The opening area of the pressure relief portion 52A-3 is larger than the opening area of the nozzle hole 52A-2. For example, the opening area of the pressure relief portion 52A-3 is desirably about four times the opening area of the nozzle hole 52A-2. Thus, by providing the pressure escape portion 52A-3 having an opening area larger than that of the nozzle hole 52A-2, a high water pressure applied to the tank cleaning nozzle 52A can be released from the pressure escape portion 52A-3. As a result, it is possible to reduce the possibility of the bellows-shaped bellows portion bulging, and to ensure safety.

  In addition, the opening of the pressure relief portion 52A-3 is not directly below, but substantially faces the rotation direction of the inner tank 10. Thereby, the water from the pressure escape portion 52A-3 is scattered in the left and right direction when the user is seen from the front surface of the housing, so that the water from the pressure escape portion 52A-3 is difficult to enter the view from the user. The designability at the time of tank washing can be improved.

  The positioning rib 52A-4 is a rib for positioning when the tank cleaning nozzle 52A is attached to the outer tank cover 22. The screwing holes 52A-5 are screwing holes for fixing to the outer tank cover 22 (reference numerals are omitted in FIGS. 24 and 25).

  In addition, the nozzle hole 52A-1 may be provided at one place or a plurality of nozzle holes 52A-1.

Claims (2)

An outer tub that stores water therein and has an outer tub body and an outer tub cover;
An inner tub that is rotatably supported in the outer tub and in which clothing is stored;
A motor that rotationally drives the inner tank;
Water supply means for supplying water into the outer tub;
A tank washing nozzle for sprinkling water from the water supply means through the bellows part;
The tank cleaning nozzle includes a nozzle hole that sprays water toward the inside of the outer tank cover, and a pressure relief portion that faces in a direction different from the nozzle hole and has an opening area larger than the opening area of the nozzle. A washing machine characterized by that. The washing machine according to claim 1,
The opening of the pressure relief portion is substantially in the direction of rotation of the inner tub.

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