JP2020171393A - Washing machine - Google Patents

Abstract

To provide a washing machine which improves rinsing performance in a rinsing step for pouring water to laundry while rotating a washing and dewatering tub.SOLUTION: A washing machine in the present disclosure includes: a body 11; a water tub 13 formed in a bottomed cylindrical shape, and supported in the body 11 in a vibration-proof manner; a washing and dewatering tub 15 included inside the water tub 13 so as to rotate and opening upward; and a water pouring device 32 for pouring water to the washing and dewatering tub 15. The water pouring device 32 includes: a detergent case 29 stored so as to be drawn; a flowing water surface 42 provided below the detergent case 29; a water pouring port 36 for flowing the water flowing on the flowing water surface 42 to the washing and dewatering tub 15; and a guide 40 and a guide protrusion part 41 for guiding the water flowing out of the water pouring port 36 downward. Thereby, the water flowing out of the water pouring port 36 is guided downward by the guide protrusion part 41, so that, in a rinsing step of pouring water to laundry while rotating the washing and dewatering tub, water can be poured onto the laundry attached to an inner wall surface of the washing and dewatering tub 15.SELECTED DRAWING: Figure 2

Description

The present disclosure relates to a washing machine for washing with water.

Patent Document 1 discloses a washing machine provided with a detergent water injection device above the washing / dehydrating tub.

The washing machine in Patent Document 1 is arranged on the washing machine main body, a water tub supported by vibration isolation inside the washing machine main body, a washing / dehydrating tub rotatably contained inside the water tub, and an upper part of the washing machine main body. , The upper frame body in which the laundry loading / unloading port that communicates the washing / dehydrating tub and the outside is formed in the substantially central part, and the upper frame body that is attached to the upper frame so as to be located behind the laundry loading / unloading port. A detergent charging device for supplying detergent and water to the dehydration tank is provided. The detergent injection device has a detergent case that is retractably stored forward, a flowing water surface that is provided below the detergent case and is inclined downward from the rear to the front, and a water injection port provided in front of the flowing water surface. ..

Japanese Unexamined Patent Publication No. 2007-275327

However, in the conventional configuration, when a large amount of water is poured from the water injection port into the washing / dehydrating tub, the force of the water flow is so strong that the water falls into the center of the washing / dehydrating tub. On the other hand, in the shower rinsing operation in which water is injected into the laundry while rotating the washing / dehydrating tub and drained at the same time, the laundry sticks to the inner wall surface of the washing / dehydrating tub due to centrifugal force. Therefore, there is a problem that the water that has fallen to the center of the washing / dehydrating tub does not hit the laundry and the rinsing effect cannot be sufficiently exerted.

The present disclosure provides a washing machine that improves rinsing performance in a rinsing step of injecting water into laundry while rotating a washing / dehydrating tub.

The washing machine in the present disclosure includes a housing, a water tank formed in a bottomed cylindrical shape and vibration-proof supported inside the housing, and rotatably enclosed inside the water tank to open upward for washing and removing. It is provided with a water tank and a water injection device for injecting water into the washing / dehydrating tank. The water injection device includes a detergent case that is retractably stored, a water flow surface provided below the detergent case, a water injection port that allows water flowing on the water flow surface to flow down to the washing and dehydration tank, and the water injection port. It has a guide portion for guiding the water flowing out from the water downward.

The washing machine in the present disclosure improves the rinsing performance of the rinsing step of injecting water into the laundry while rotating the washing / dehydrating tub.

Longitudinal sectional view of the washing machine according to the first embodiment Longitudinal section of the water injection device of the washing machine Bottom view of the water injection device of the washing machine Schematic diagram showing how water is discharged from a water flow port in a conventional water injection device (A) Schematic diagram showing how water is discharged from the water outlet of the washing machine according to the first embodiment, and (b) Schematic diagram showing how water is discharged from the water outlet of the washing machine according to another embodiment.

Hereinafter, embodiments will be described in detail with reference to the drawings. The present invention is not limited by the accompanying drawings and the following description.

(Embodiment 1)
FIG. 1 is a vertical cross-sectional view of the washing machine according to the first embodiment.

As shown in FIG. 1, an upper frame body 24 is arranged on the upper part of the main body 11, and a laundry for communicating the washing / dehydrating tub 15 with the outside is provided at a substantially central portion of the upper frame body 24. The inlet / outlet 25 is formed. The upper part of the laundry loading / unloading port 25 is covered with a lid 26 so as to be openable / closable. An annular balancer 17 for reducing dehydration vibration is attached to the upper portion of the washing / dehydrating tub 15.

An operation display unit 16 is provided on the upper front side of the upper frame body 24 to set modes such as a driving course and various functions, and display settings and progress. Inside the operation display unit 16, a control device 27 having a control means (not shown) for controlling the operation of the motor 20 and the like and sequentially controlling a series of steps of washing, rinsing, and dehydration is provided.

The motor 20 is attached to the bottom of a water tank 13 including a washing / dehydrating tank 15, and is connected to a mechanical device 19 incorporating a clutch mechanism and a brake mechanism via a motor pulley 21, a V-belt 23, and an input pulley 22. A dehydration shaft 14 projecting upward from the mechanical device 19 is connected to the bottom of the washing / dehydrating tub 15. A pulsator 18 is rotatably provided on the inner bottom of the washing / dehydrating tub 15, and the pulsator 18 is connected to a washing shaft 44 extending from the dehydration shaft 14. The washing / dehydrating tank 15 is swingably supported by the main body 11 by the suspension 12.

A water injection case 31 is provided at the rear of the periphery of the laundry inlet / outlet 25 so that the detergent case 29 can be pulled out forward and stored. The water injection case 31 communicates with the water supply valve 28 via the packing 30. The water injection device 32 is composed of the detergent case 29, the water supply valve 28, and the water injection case 31.

At the time of washing, the pulsator 18 is rotationally driven to stir the clothes in the washing liquid, and at the time of dehydration, the drain valve 43 is opened to drive the washing / dehydrating tub 15 to rotate, and the washing liquid or rinsing liquid in the water tub 13 is used as a machine. Drain outside.

Next, the detailed structure of the water injection device will be described.

FIG. 2 is a vertical sectional view of the water injection device of the washing machine according to the first embodiment, and FIG. 3 is a bottom view of the water injection device of the washing machine.

At the lower part of the water injection case 31, a flowing water surface 42 for guiding the water flowing from the detergent case 29 and the detergent downward is provided. On the front side of the detergent case 29, a guide 40 is formed so as to extend vertically downward from the lower part of the detergent case 29.

A recess 45 is formed in the vicinity of the lower end of the flowing water surface 42 so that the guide 40 can enter. The guide 40 is formed with a guide protrusion 41 extending vertically downward from the recess 45 of the detergent case 29. The water injection port 36 is formed so that the width of the guide protrusion 41 and the recess 45 is the guide width c, and the width of the guide protrusion 41 and the recess 45 in the front-rear direction is the opening width d. The water injection port 36 allows water and detergent guided to the running water surface 42 to flow down.

A guide protrusion 41 is provided at the tip of the guide 40 so as to extend from the lower end of the flowing water surface 42 by the length b of the guide protrusion.

Further, the radial thickness of the balancer 17 is defined as the thickness a, and the distance from the outermost circumference of the balancer 17 to the guide protrusion 41 is defined as the distance e.

The operation and configuration of the washing machine configured as described above will be described below.

The outline of the washing operation will be explained.

The user opens the lid 26, loads the laundry into the washing / dehydrating tub 15 through the laundry loading / unloading port 25, and operates the operation display unit 16 to start the washing operation. The washing machine detects the amount of laundry contained in the washing / dehydrating tub 15, and displays the required amount of detergent according to the amount of laundry on the operation display unit 16. When the user puts a required amount of detergent in the detergent case 29 and closes the lid 26, water is supplied to the detergent case 29 and the detergent dissolves in the water. The water in which the detergent is dissolved passes through the inside of the water injection device 32 and is put into the washing / dehydrating tank 15. The operation inside the water injection device 32 will be described later. Water is supplied until a predetermined water level in the washing / dehydrating tank 15 is reached, after which the washing process is started.

At the start of the washing process, the undissolved detergent is completely dissolved in water by the rotational drive of the pulsator 18, and permeates the laundry as a washing liquid. In the washing step, the laundry is agitated in the washing liquid by rotating the pulsator 18 for a predetermined time. When the washing step is completed, the drain valve 43 is opened, the water in which the dirt is dissolved is drained to the outside of the water tank 13, and the process proceeds to the rinsing step.

In the first embodiment, the rinsing step is configured by combining the rinsing operations of either or both of the "reservoir rinsing operation" and the "shower rinsing operation". Therefore, in the rinsing operation, the laundry is agitated by the pulsator 18 while collecting water in the washing / dehydrating tank 15. In the shower rinsing operation, water is injected toward the laundry while rotating the washing / dehydrating tub 15 at a low speed, and drainage is performed from the lower part of the washing / dehydrating tub 15.

When the series of rinsing steps is completed, the dehydration step is started. In the dehydration step, the washing / dehydrating tub 15 is rotated at high speed to drain the water contained in the laundry by centrifugal force. When the dehydration process is completed, the washing operation is completed.

Subsequently, the water injection operation in the shower rinsing operation will be described.

FIG. 4 is a schematic view showing how water is discharged from the water flow port of the conventional water injection device, and FIG. 5 (a) is a schematic view showing how water is discharged from the water flow port of the washing machine according to the first embodiment. FIG. 5 (b) is a schematic view showing how water is discharged from the water outlet of the washing machine in another embodiment.

As shown in FIGS. 2 and 3, the detergent charged into the detergent case 29 is dissolved in the water injected from the water supply valve 28 and guided to the water injection case 31 from the opening provided in the detergent case 29. The water and detergent that have reached the lower part of the water injection case 31 pass through the water flow surface 42 and flow down from the water injection port 36. The water and detergent flowing down from the water injection port 36 are guided by the guide 40 and fall into the washing / dehydrating tank 15.

The operation of the washing machine configured as described above will be described below.

The operation of the guide protrusion 41 will be described.

As shown in FIG. 4, when the amount of water supplied is large in the conventional water injection device, the water flow flowing on the flowing water surface jumps out from the water flow port while maintaining the momentum and falls to the center of the washing / dehydrating tank 15 in a parabolic manner. Then, in the shower rinsing operation in which water is injected while rotating the washing / dehydrating tub 15, water does not hit the laundry stuck to the inner wall surface of the washing / dehydrating tub 15 due to centrifugal force. This phenomenon becomes remarkable especially when the amount of laundry is small. Therefore, when the shower rinsing operation is performed using the conventional water injection device, there is a problem that the rinsing effect is not sufficiently exhibited.

As shown in FIG. 5A, the water injection device 32 according to the first embodiment is provided with a guide protrusion 41 so as to protrude below the water flow surface 42. As a result, the water flowing on the flowing water surface 42 flows downward along the guide projecting portion 41 and falls near the inner wall surface at the inner bottom portion of the washing / dehydrating tank 15. As a result, in the shower rinsing operation, it becomes possible to inject water into the laundry attached to the inner wall surface of the washing / dehydrating tub 15, and the rinsing effect can be improved.

Further, as shown in FIG. 5B, when the guide protrusion 41 is tilted toward the inner wall surface of the washing / dehydrating tub 15, the water flow can be controlled to hit the inner wall surface of the washing / dehydrating tub 15. However, since the suspension 12 extends according to the amount of laundry and the amount of water contained in the washing / dehydrating tub 15 and the distance between the washing / dehydrating tub 15 and the water injection device 32 changes, the position where the water flow hits can be made constant. difficult. By forming the guide 40 in the vertical direction as shown in FIG. 5A, the position where the water flow falls can be controlled near the inner wall surface of the washing / dehydrating tub 15.

Subsequently, the relationship between the guide width c and the opening width d and the amount of water supplied, the radial thickness of the balancer 17 is the thickness a, and the distance from the outermost circumference of the balancer 17 to the guide protrusion 41 is the distance e. The relationship will be explained.

In Equation 1, the Reynolds number Re is a dimensionless quantity defined by the ratio of inertial force to viscous force in fluid mechanics. A low value represents a laminar flow, which is a smooth and stable flow, and a high value represents a turbulent flow, which is a chaotic vortex or an unstable flow.

Here, the water supply flow rate V is as shown in Equation 2.

Therefore, the average velocity u relative to the flow of the object is as shown in Equation 3.

The characteristic length L in the case of the opening width of the rectangular parallelepiped shape is as shown in Equation 4.

Therefore, the Reynolds number Re is as shown in Equation 5.

Generally, when Re is 2000 or less, it is called laminar flow, when Re is 5000 or more, it is called turbulent flow, and between them is called a transition region, and the outline of the flow state can be similarly defined.

Here, the guide width c and the opening width d are set as in Equation 6.

As a result, even for an unstable flow such as a turbulent flow when the supply flow rate is high, the guide protrusion length b [m] is made long and the condition of the equation 7 is satisfied, so that the water supply flow velocity is high. It is possible to stably fall directly under the opening.

As described above, the washing machine according to the first embodiment has a main body 11, a water tank 13 formed in a bottomed cylindrical shape and supported by vibration isolation inside the main body 11, and rotatably contained inside the water tank 13 and upward. A washing / dehydrating tub 15 that opens and a water injection device 32 that injects water into the washing / dehydrating tub 15 are provided. The water injection device 32 includes a detergent case 29 that is retractably stored, a flowing water surface 42 provided below the detergent case 29, a water injection port 36 that allows water flowing on the flowing water surface 42 to flow down into the washing / dehydrating tank 15. It has a guide 40 and a guide protrusion 41 that guide the water flowing out from the water injection port 36 downward.

As a result, the water flowing out from the water injection port 36 is guided downward by the guide protrusion 41, so that the water drop position is near the inner wall surface of the washing / dehydrating tank 15.

Here, by setting the guide protrusion length b to 0.016 m or more, it is possible to stably fall directly below the opening even when the water supply flow velocity is high. Further, the radial thickness a of the balancer 17 and the distance e from the outermost circumference of the balancer 17 to the guide projecting portion 41 are set to a ≦ 0.03 m and e ≦ 0.072 m, respectively, to obtain the amount of laundry. It is possible to inject water into the laundry stuck to the wall surface in the washing / dehydrating tub even when the amount is small. When pouring water into the laundry stuck to the wall surface in the washing / dehydrating tub, it is possible to stably discharge the water without hindering the water pouring. If it becomes larger than the above, the problem of water splashing due to imbalance occurs when shower rinsing is performed at a low speed, but such a problem can be solved by the above configuration.

Therefore, in the rinsing step of injecting water into the laundry while rotating the washing / dehydrating tub, water can be injected into the laundry attached to the inner wall surface of the washing / dehydrating tub 15, so that the rinsing performance can be improved.

The present disclosure is applicable to a washing machine that injects water into the washing tub from above. Specifically, the present disclosure is applicable to vertical washing machines, two-tank washing machines, and the like.

11 Main body 12 Suspension 13 Water tank 15 Washing and draining tank 16 Operation display 17 Balancer 18 Parsator 20 Motor 24 Upper frame 25 Laundry inlet / outlet 26 Lid 27 Control device 28 Water supply valve 29 Detergent case 31 Water injection case 32 Water injection device 36 Water injection port 40 Guide 41 Guide protrusion 42 Water flow surface 43 Drain valve

Claims (5)

A housing, a water tank formed in a bottomed cylindrical shape and supported by vibration isolation inside the housing, a washing / dehydrating tank that is rotatably contained inside the water tank and opens upward, and washing / removal. Equipped with a water injection device that injects water into the aquarium,
The water injection device includes a detergent case that is retractably stored, a flowing water surface provided below the detergent case, a water injection port that allows water flowing on the flowing water surface to flow down into the washing / dehydrating tank, and the water injection port. A washing machine having a guide portion that guides water flowing out of the washing machine downward. The washing according to claim 1, wherein the guide portion is formed so as to extend downward from the lower part of the detergent case, and has a guide protrusion portion extending downward by the length b of the guide protrusion portion from the lower end of the running water surface. Machine. The water injection port is formed so that the width is the guide width c [m] and the width in the front-rear direction is the opening width d [m], and the relationship between the guide protrusion length b [m] is the mathematical formula "1000 * b *. The washing machine according to claim 2, which has a configuration satisfying (c + d) ≧ 1.8 ”. The washing machine according to claim 3, wherein the guide protrusion length b is 0.016 m or more. An annular balancer for reducing dehydration vibration is attached to the upper part of the washing / dehydrating tub, and the radial thickness a of the balancer and the distance e from the outermost circumference of the balancer to the guide protrusion are set. The washing machine according to any one of claims 1 to 4, wherein a ≦ 0.03 m and e ≦ 0.072 mm, respectively.

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