JP6732867B2 - Drum type washing machine - Google Patents

Description

The present invention relates to a drum type washing machine provided with a circulation path for circulating washing water in a water tank.

Generally, a drum-type washing machine includes a bottomed cylindrical water tub whose back side is closed. The water tank is elastically supported in the outer box such that the central axis of the water tank is located on the axis descending rearward. A drum rotatably driven by a washing machine motor is rotatably provided in the water tank. A plurality of baffles for scraping up the laundry are provided on the inner peripheral portion of the drum. The baffle is configured to extend straight in the front-rear direction of the water tank, for example. Then, when washing in the washing operation, the washing water in which the detergent is dissolved is stored in the aquarium, the drum is rotated, and the clothes, which is the laundry including the washing water, is scraped up by the baffle and dropped, so that the clothes are hit and washed. Is performed.

In a drum type washing machine having such a baffle, it is important that the washing water in which the detergent is dissolved is sufficiently permeated into the clothes before being dropped from the baffle. Therefore, conventionally, a circulation path having a circulation pump for taking out the wash water from the bottom of the aquarium and discharging it into the drum from the upper part of the aquarium is provided, and in addition to the natural permeation of the wash water when the clothes are at the bottom of the drum, A configuration is considered in which forced circulation is achieved by spraying washing water into the drum through a circulation path (see, for example, Patent Document 1).

JP, 2008-113982, A

In the conventional configuration, the water tank is elastically supported in the outer box so that the central axis is located on the axis line that descends rearward, so that the wash water easily collects in the corner portion on the back side of the water tank. There is an advantage that the water level can be raised with a small amount of washing water. However, since the drum is rotatably provided around the axis in the water tank, the baffle is also inclined downward toward the back side, and the clothes scraped up along with the rotation of the drum are placed on the back side. As a result, the clothes tend to be unevenly distributed on the back side in the drum. Therefore, it has been difficult to uniformly permeate the washing water into the entire clothes by simply sprinkling the washing water from the upper part of the water tub into the drum by the circulation route as in the conventional case. As a result, the tapping and washing effect of the laundry may not be sufficiently obtained, resulting in poor washing efficiency. This is a problem similarly occurring during rinsing.

The present invention has been made in view of the above circumstances, and an object thereof is to allow wash water to uniformly permeate through the laundry through a circulation path and to obtain a sufficient tap washing effect for the laundry. It is an object of the present invention to provide a drum type washing machine that can perform washing and rinsing efficiently.

The drum-type washing machine according to the embodiment is elastically supported such that the central axis is located on the axis descending rearward, and has a bottomed cylindrical water tub with the back side closed, and the axis in the water tub. A bottomed cylindrical drum that is rotatably provided at the center and has a closed back side; a washing machine motor that is provided outside the water tank and drives the drum; and a water discharge mechanism unit that sprinkles water inside the drum. A drainage port formed at the bottom of the water tank, a circulation path formed so as to connect the drainage port and the water discharge mechanism unit, and water drawn from the drainage port unit From the circulating pump that discharges into the drum from the inside, and at the beginning of the washing process by detecting the weight of the clothes , water is sprinkled into the inside of the drum by the water discharge mechanism, and the drum is rotated at a low speed to move the inside of the drum. the contained laundry have repeatedly rows beating wash being dropped is scraped up by the baffle, the when the weight of the clothes is large and a control device for setting so many rotation time of the drum in the beating wash , Is provided.

1 is a vertical sectional side view of an entire drum type washing machine showing a first embodiment of the present invention. Broken perspective view of the entire drum type washing machine Development plan view of a part of drum Rear view of aquarium cover Sectional view taken along line 5-5 of FIG. Sectional drawing along line 6-6 in FIG. Sectional drawing which follows 7-7 of FIG. Sectional view taken along line 8-8 of FIG. View from arrow E of FIG. View from the arrow F of FIG. Block diagram showing electrical configuration Rear view schematically showing the drum for explaining the operation Side view schematically showing the drum for explaining the action Time chart for explaining the action (1) Time chart for explaining the action (Part 2) Time chart for explaining the action (Part 3) Flowchart for explaining the action Diagram showing the relationship between the amount of clothes and the penetration rate of washing water Current characteristics of pump motor Flowchart showing the second embodiment of the present invention Time chart showing a third embodiment of the present invention

Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
First, FIGS. 1 and 2 show the overall structure of a drum type washing machine. In detail, the outer case 1 of the drum type washing machine includes a base 1A made of synthetic resin and a box body 1B connected to the base 1A. A laundry entrance/exit portion 2 is formed in a substantially central portion of a front surface portion (left side in FIG. 1) of the box body 1B, and a door 3 having a double glass structure for opening/closing the laundry entrance/exit portion 2 is provided. .. Further, an operation panel 4 is provided on an upper portion of the front surface of the box body 1B, and a control device 5 as a control means is provided on the back side (inside the outer box 1) thereof.

Inside the outer box 1, a bottomed cylindrical water tank 6 having a closed back side is provided. The water tank 6 is elastically supported by the suspension 7 so that the center axis of the water tank 6 is located on the axis line that descends rearward (right side in FIG. 1).

A washing machine motor 8 is provided outside the rear side of the water tank 6. The washing machine motor 8 is composed of, for example, a DC brushless motor, is of an outer rotor type, and has a stator 8A and a rotor 8B. The stator 8A is attached to the outer side of the back surface of the water tank 6, and the rotating shaft 8C at the center of the rotor 8B is supported by the bearing bracket 9 via the bearing 10 and inserted into the water tank 6.

Inside the water tank 6, a bottomed cylindrical drum 11 having a closed back side is provided. The drum 11 has a central portion on the outer side on the back side connected to the tip of the rotating shaft 8C of the washing machine motor 8, is rotatably provided around the axis of the water tank 6, and is driven in the forward and reverse directions by the washing machine motor 8. It In this case, the washing machine motor 8 functions as a drive device that rotates the drum 11.

A large number of holes 12 are formed in the entire peripheral wall (body) of the drum 11. In this case, the hole 12 is formed in a front half (front half) of the front and rear center of the drum 11, that is, in a region in front of the front and rear center of the drum 11 (shown as a hole 12A in the drawing). The number should be larger than the number of the ones formed in the rear half (the latter half) of the drum, that is, in the region rearward of the front and rear center of the drum 11 (shown as holes 12B in the drawing). It is set. Further, a plurality of baffles 13 for scraping up the laundry, for example, three baffles 13 are provided at equal intervals on the inner peripheral portion of the drum 11. The baffle 13 will be described in detail later.

Both the drum 11 and the water tank 6 are open on the front side. A liquid-sealed rotary balancer 15, for example, is provided inside the peripheral portion of the opening 14 on the front surface side of the drum 11. A water tank cover 16 is attached to an opening on the front side of the water tank 6, and an opening 16a at the tip thereof is connected to the laundry entrance/exit portion 2 by a bellows 17 made of an annular elastic material such as rubber. .. As a result, the laundry entrance/exit 2 is connected to the inside of the drum 11 via the bellows 17, the water tank cover 16 and the opening 14 of the drum 11.

A drain port portion 18 that also serves as a water intake portion is formed at the bottom portion on the back side of the water tank 6. One end of an in-machine drainage hose 19 is connected to the drainage port 18. The other end of the in-machine drainage hose 19 is connected to the in-machine drainage hose connection port portion 21 of the filter case 20 provided in the front part of the base 1A of the outer box 1.

The filter case 20 has the in-machine drainage hose connection port portion 21 formed in the upper portion, and a cap 22 attached to the front end portion. The filter case 20 accommodates a lint filter (not shown) integrated with the cap 22 inside. A drain valve 23 is connected to the lower portion of the filter case 20, and a drain pipe 24 is connected to the outlet of the drain valve 23. The tip of the drainage pipe 24 is exposed from the base 1A of the outer box 1 to the outside of the machine and is connected to an outside drainage hose (not shown).

On the other hand, a circulation pump 25 is provided at the rear end of the filter case 20. The circulation pump 25 sucks water in the water tank 6 (drum 11) through the drain port 18, the in-machine drain hose 19 and the filter case 20. The circulation pump 25 (the pump motor 25a is shown in FIG. 11) has a discharge port portion 26 formed on the peripheral side (upper part in the figure), and one end portion of a water supply hose 27 is connected to the discharge port portion 26. The water supply hose 27 has an intermediate portion extending upward from the circumferential side of the water tank cover 16 and a tip portion connected to a water discharge mechanism portion 28 formed on the water tank cover 16. The water discharge mechanism 28 is configured to spray water inside the drum 11, as described later. As a result, the circulation path 30 is formed so as to connect the drain port section 18 and the water discharge mechanism section 28. That is, the circulation path 30 is formed of the water tank 6, the drum 11, the drain port portion 18, the in-machine drainage hose 19, the filter case 20, the water supply hose 27, and the water discharge mechanism portion 28, and the circulation pump 25 is located in the circulation path 30. Is provided. Then, the circulation pump 25 discharges the water taken out from the drain port portion 18 of the water tank 6 from the water discharge mechanism portion 28 into the drum 11 in a shower shape.

An air trap 31 is provided on the upper part of the front part of the filter case 20. The air trap 31 and the water level sensor 32 arranged at the top of the outer case 1 are connected by an air tube 33. As a result, the water level sensor 32 detects the water level in the water tank 6 via the in-machine drainage hose 19, the filter case 20, the air trap 31, and the air tube 33, and functions as a water level detecting means. Has become.

A water supply valve 34 and a water supply case 35 are provided at the top of the outer box 1. The water supply valve 34 is configured such that an inlet is connected to an external water supply hose (not shown) connected to a water tap (not shown), and an outlet is connected to one end of a connection pipe 36. The other end of the connection pipe 36 is connected to the water supply case 35. The water supply case 35 has a detergent reservoir (not shown) inside. One end of an in-machine water supply hose 37 is connected to the water supply case 35, and the other end of the in-machine water supply hose 37 is connected to an upper portion of the water tank 6. As a result, the water supplied from the water supply via the water supply valve 34 is supplied into the water tank 6 via the connection pipe 36, the detergent reservoir of the water supply case 35, and the in-machine water supply hose 37. Further, the water supply valve 34 and the water supply case 35 constitute a normal water supply device 38 for supplying water into the water tank 6.

As shown in FIGS. 1 to 3, the baffle 13 extends in the front-rear direction along the axis of the water tank 6 and projects toward the rotation center axis of the drum 11. The baffle 13 has a mountain range shape in which both side surface portions 13A and 13B in the circumferential direction rise toward the central ridge portion 13C. A plurality of holes 13D are formed in the central ridge 13C. In the present embodiment, the side surface portion 13A is a side surface portion on the clockwise direction (for example, the arrow A direction in FIGS. 2 and 3) when the drum type washing machine is viewed from the front, and the side surface portion 13B is a drum type. The washing machine is a side portion on the counterclockwise direction side (for example, the direction of arrow B in FIGS. 2 and 3) when viewed from the front.

The central ridge portion 13C of the baffle 13 is curved like a sine wave when viewed from the plane direction, as shown in FIGS. Specifically, the central ridge portion 13C is divided into the first ridge portion 13Ca, the second ridge portion 13Cb, and the third ridge portion 13Cc when the regions are divided into three so as to be aligned in the longitudinal direction. It is configured. The first protrusion 13Ca is located on one side in the circumferential direction (for example, the arrow A direction side when the drum type washing machine is viewed from the front) with respect to the line L (see FIG. 3) along the axis of the water tub 6. Moreover, it is located on the front side of the drum 11. The second protruding portion 13Cb is located on the other side in the circumferential direction with respect to the line L along the axis (for example, the arrow B direction side when the drum type washing machine is viewed from the front) and on the back side of the drum 11. doing. The third protrusion 13Cc is located between the first protrusion 13Ca and the second protrusion 13Cc. Further, the first ridge 13Ca and the third ridge 13Cc are connected by a smooth curve, and the second ridge 13Cb and the third ridge 13Cc are also connected by a smooth curve. And the 1st recessed part 13E is formed of the 1st protrusion part 13Ca and the 3rd protrusion part 13Cc, and the 1st recessed part 13E is formed by the 2nd protrusion part 13Cb and the 3rd protrusion part 13Cc. A second recessed portion 13F opposite to that is formed.

As shown in FIG. 1, an air trap 39 communicating with the inside of the water tank 6 is provided on the upper portion of the back surface of the water tank 6. The air trap 39 and the bubble sensor 40 arranged at the top of the outer box 1 are connected by an air tube 41. The bubble sensor 40 is composed of a pressure switch, and when bubbles are generated in the water tank 6 and reach the air trap 39, the pressure inside the air trap 39 changes due to the expansion and contraction of the bubbles as the drum 11 rotates. Therefore, the amount of bubbles generated is detected by detecting the pressure change.

Next, the water discharge mechanism 28 will be described with reference to FIGS. 4 to 10.
As shown in FIG. 1, FIG. 4, FIG. 5 and FIG. 6, the water discharge mechanism portion 28 includes protrusions 42, 42 integrally formed on an outer peripheral portion of an upper surface of an inner surface portion of the water tank cover 16, and the protrusions 42. 42, and a closing plate 44 that is attached (welded) to the front end portion of 42 to form a water channel 43. A connection port portion 45 (see FIG. 5) communicating with the water channel 43 is formed at a left portion (right portion in FIG. 4) of the water tank cover 16 in FIG. It is connected. A first water discharge port portion 46 (see FIG. 7) is formed together with the closing plate 44 at a portion of the water tank cover 16 located above the connection port portion 45. It has a diffusing plate portion 46a facing inside. A second water outlet 47 together with the closing plate 44 is provided at a portion of the aquarium cover 16 that is located on the opposite side of the first water outlet 46 (rightward in FIG. 2, leftward in FIG. 4). (See FIG. 8) is formed, and the second water discharge port portion 47 has a diffusion plate portion 47 a facing the inside of the drum 11. In this case, the first water discharge port portion 46 and the second water discharge port portion 47, as shown in FIG. 12 and FIG. 13, the water drop points of the second water discharge path Pa by the first water discharge port portion 46, It is set on the front side in the drum 11, and the water drop point of the water discharge path Pb by the second water discharge port 47 is set to be on the back side of the water drop point of the first water discharge port 46. Then, as shown in FIGS. 9 and 10, the first water discharge port portion 46 and the second water discharge port portion 47 are closer to the opening of the second water discharge port portion 47 than the opening of the first water discharge port portion 46. Is set so that the discharge flow rate of the second water discharge port portion 47 is larger than the discharge flow rate of the first water discharge port portion 46. As shown in FIG. 8, the second water outlet 47 has a water passage hole 47b for injecting washing water onto the rear glass 3a of the door 3. The bubbles adhering to the rear glass 3a of the door 3 are made to flow away by the water jetted from the water passage 47b of the second water outlet 47.

FIG. 11 shows an electrical configuration of the drum type washing machine. The control device 5 is mainly composed of a microcomputer and controls the overall operation of the drum type washing machine. The control device 5 includes various operation signals from the operation unit 48 including various keys (switches) provided on the operation panel 4 (see FIG. 1 ), a water level detection signal from the water level sensor 32, and a bubble sensor 40 from the bubble sensor 40. A foam detection signal, a speed detection signal from a rotation sensor that detects the rotation speed of the washing machine motor 8, a speed detection signal from a rotation sensor 50 that detects the rotation speed of the pump motor 25a, and a current transformer that detects the current of the pump motor 25a. A current detection signal or the like from 51 is input.

Then, the control device 5 controls the water supply valve 34, the drain valve 23, the washing machine motor 8, and the pump motor 25a based on the various input signals and the control programs stored in advance. In this case, the control device 5 controls the rotation speed of the washing machine motor 8 by a pulse width modulation (PWM) method using an inverter. Further, the control device 5 displays, on the display unit 52, which is, for example, a liquid crystal panel provided on the operation panel 4, the amount of detergent used according to the weight detection of the laundry to be described later, the set driving course, and the remaining operation. It displays various information such as time, reserved time, and current time.

Next, the operation of the above configuration will be described with reference to the time charts of FIGS. 14 to 16 and the flowchart of FIG.
In this embodiment, for example, the user operates the operation panel 4 to select a normal operation course (a course in which each process of washing, rinsing, and dehydration is performed), and operates the start key of the operation unit 48 of the operation panel 4. Then, the control device 5 starts the operation of the selected operation. The control device 5 first detects the weight of the laundry (clothing) based on the signal output from the operation unit 48 (processing step S1 in FIG. 17). The weight of the laundry is detected by rotating the drum 11 to a predetermined rotation speed, the time required for the rotation, and then stopping the driving of the drum 11 by the washing machine motor 8 to rotate the drum 11 by inertia, thereby causing the drum 11 to rotate. Is calculated from the time required for the rotation speed of the machine to fall to a predetermined rotation speed, and the weight of the laundry is detected by the rotation load of the washing machine motor 8. After that, the amount of detergent is determined from the detection result of the laundry weight, the water level in the washing process is determined accordingly, and the rotation speed of the drum 11 is determined. In this case, the rotation sensor 49 that detects the rotation speed of the washing machine motor 8 serves as a weight detection unit that detects the weight of the laundry in the drum 11. Then, the control device 5 causes the display unit 52 to display the detergent amount as the determination result of the detergent amount (processing step S2 in FIG. 17).

Note that the control device 5 detects the weight (load amount) of the laundry in three stages of small (for example, 1 kg), medium (for example, 3 kg) and large (for example, 6 kg), and accordingly, FIG. The time charts of FIGS. 15 and 16 are selected.

The control device 5 waits for a predetermined time (for example, 20 s (seconds)) for the user to input the detergent amount displayed in the water supply case 35 based on the detergent amount display on the display unit 52 (determination step S3 in FIG. 17). ), after a lapse of a predetermined time, the water supply valve 34 is opened, and tap water is supplied to the water level determined for the washing process (the water level at which the laundry is immersed). In this case, it is assumed that the detergent storage portion of the water supply case 35 is preliminarily charged with an amount of detergent according to the determination of the detergent amount by the control device 5. Here, since the drum 11 is provided rotatably around the axis of the water tank 6 whose center axis descends rearward, the water to be supplied is on the back side (the latter half part) of the drum 11 (water tank 6). Side) and becomes shallower toward the front side (front half side) of the drum 11, and there is little or no water near the front side (front end side) of the drum 11.

When the water supply is started, the control device 5 causes the washing machine motor 8 to cycle at a low speed (for example, 40 to 60 rpm) in the normal rotation 15 s (seconds), a stop 1 s, a low speed (for example, 40 to 60 rpm) in the reverse rotation 15 s, and a stop 1 s. The drum 11 is driven to rotate (process step S5 in FIG. 17, see FIGS. 14 to 16C).

After that, when the water level detected by the water level sensor 32 reaches the water level at which the circulation pump 25 can be driven (“YES” in determination step S6 in FIG. 17), the control device 5 detects whether the foam sensor 40 has detected a predetermined amount of foam. Whether or not it is determined, the pump motor 25a is rotated to drive the circulation pump 25 (see FIGS. 14 to 16(b)). In this case, when the amount of bubbles detected by the bubble sensor 40 is less than the predetermined amount (“NO” in determination step S7), the control device 5 rotates the pump motor 25a at a set speed (for example, 2000 rpm) to drive the circulation pump 25. (Processing step S8). Further, when the amount of bubbles detected by the bubble sensor 40 is equal to or larger than a predetermined amount (“YES” in determination step S7), the control device 5 sequentially moves the pump motor 25a from the current set speed (eg, 2000 rpm) to a constant speed (eg, 100 rpm). The circulation pump 25 is driven by rotating at a reduced speed (for example, 2000-100 rpm) (processing step S9).

Further, the control device 5 observes the detected current value of the current transformer 51 and determines the air leakage of the circulation pump 25 (determination step S10 in FIG. 17). The washing water supplied to the water tank 6 or the drum 11 in which the detergent is dissolved is stirred by the baffle 13 and agitated by the falling laundry, and is circulated by the circulation pump 25 to generate bubbles. However, if this amount becomes excessive, not only the cleaning effect will deteriorate, but also the circulation pump 25 will be damaged. When excessive bubbles are generated in the water tank 6 and enter the circulation pump 25, as shown in FIG. 19, the current value of the pump motor 25a fluctuates greatly and thereafter becomes substantially constant at a low value below a predetermined value. Accordingly, the control device 5 determines whether or not the air leak has occurred in the circulation pump 25 (determination step S10 in FIG. 17).

When it is determined that the circulation pump 25 is bleeding with air (“YES” in determination step S10), the control device 5 changes the set speed of the pump motor 25a from the current set speed to a constant speed (determined in step S11). The speed is reduced (for example, 100 rpm) (processing step S11 in FIG. 17), and the process proceeds to the next determination step S12. When the control device 5 determines that no air leak has occurred in the circulation pump 25 (“NO” in determination step S10), the control device 5 directly proceeds to determination step S12.

In the determination step S12, the control device 5 determines whether or not the water level sensor 32 has reached the predetermined washing water level set in the processing step S1, and when it has not reached (“NO” in the determination step S12), the determination step Returning to S7, when it has reached ("YES" in determination step S12), the water supply by the water supply valve 34 is stopped (processing step S13). After that, the control device 5 executes the substantial washing (processing step S14).

At the beginning of this washing process, the control device 5 causes the drum 11 to rotate normally at a low speed (for example, 40 to 60 rpm) for a time period corresponding to the weight of the laundry. That is, when the weight of the laundry is small (for example, 1 kg), the control device 5 causes the washing machine motor 8 to rotate normally for 20 s (seconds) (see FIG. 14C), and the weight of the laundry is medium ( For example, in the case of 3 kg), the washing machine motor 8 is normally rotated for 30 s (second) (see FIG. 15C), and when the weight of the laundry is large (for example, 6 kg), the washing machine motor 8 is 40 s. (Second) Rotate forward (see FIG. 16C). That is, in the initial stage of the washing process, the control device 5 selects the rotation direction of the drum 11 as the normal rotation direction, and changes the normal rotation time of the washing machine motor 8 according to the weight of the laundry to change the normal rotation time of the drum 11. The amount of rotation of is changed.

As a result, the laundry previously stored in the drum 11 is repeatedly beat-washed by being scraped up and dropped by the baffle 13. In addition, as described above, the control device 5 drives the circulation pump 25 during the washing process to remove the water in the water tank 6 taken from the drainage port 18 of the water tank 6 from the upper portion of the opening of the water tank 6. The water is supplied in a shower shape from the first water discharge port 46 and the second water discharge port 47 of the water discharge mechanism 28 toward the front surface side and the back surface side of the drum 11.

After that, the control device 5 executes the determination step S15, the processing step S16, the determination step S17 and the processing step S18 which are similar to the determination step S7, the processing step S9, the determination step S10 and the processing step S11 described above. After that, the control device 5 causes the washing machine motor 8 to perform a normal operation in which 30s forward rotation, 1s stop, 30s reverse rotation, and 1s stop are repeated (processing step S19).

Then, the control device 5 determines whether or not the set washing time has elapsed, and when it has not elapsed (“NO” in determination step S20), returns to determination step S15, and when it has elapsed (“determination step S20”). YES"), the drain valve 23 is opened to allow the water in the water tank 6 (drum 11) to flow from the drain port 18 of the water tank 6 to the in-machine drain hose 19, the filter case 20 (lint filter), the drain valve 23, and the drain pipe. 24 and the drain hose outside the machine (process step S21 in FIG. 17).

Next, the control device 5 executes the rinsing stroke. In the rinsing process, the control device 5 repeatedly performs the same water supply, rinsing, and drainage as in the washing process. Then, the control device 5 executes the dehydration process. In the dehydration process, the control device 5 rotates the drum 11 in one direction at high speed (for example, 700 to 1500 rpm) to centrifugally dehydrate the laundry. When the dehydration process ends, the normal operation course (washing operation) ends.

FIG. 12 and FIG. 13 show the appearance of the clothes W as the laundry at the beginning of the washing process of the washing operation. When the drum 11 rotates in the direction of arrow A (normal rotation), the clothes W move from the front side to the rear side (direction of arrow Y) along the side surface portion 13A of the baffle 13 while being scraped up by the baffle 13. In this case, since the second recess 13F is formed on the back surface side of the baffle 13, the garment W is not moved to the rear end side of the second recess 13F even when the drum 11 rotates. It fits in the second recess 13F. Further, since the second recess 13F is on the rear half side of the baffle 13, when the clothes W accommodated in the second recess 13F come near the uppermost position in the drum 11 due to the rotation of the drum 11, the laundry W is washed. Is dropped to the second half of the drum 11 by its own weight and is washed by being hit. At this time, a large amount of washing water is collected on the rear half side of the drum 11, so that the laundry W is likely to be soaked with water. In this case, the amount of normal rotation of the drum 11 (rotation time) is set to increase as the amount (weight) of the clothes W increases, so that the amount W of clothes increases as the amount (weight) of the clothes W increases. The laundry is moved to the back surface side and drops to the back surface side where a large amount of washing water is accumulated, which promotes the dissolution of the detergent in the water and facilitates the penetration of the washing water into the clothes W. Moreover, the amount of water sprayed from the second water discharge port 47 to the rear side of the drum 11 is set to be larger than the amount of water discharged from the first water discharge port 46 sprayed on the front side of the drum 11. Therefore, the wash water can be made to uniformly permeate the entire clothes W.

Next, when the drum 11 rotates (reverses) in the direction of arrow B, the clothes W move from the rear side to the front side (direction of arrow X) along the side surface portion 13B of the baffle 13 while being scraped up by the baffle 13. In this case, since the first recess 13E is formed on the front half of the baffle 13, the garment W is not moved to the front end of the first recess 13E even when the drum 11 rotates. It fits in the first recess 13E. Further, since the first recess 13E is on the front half side of the baffle 13, when the clothes W accommodated in the first recess 13E are near the uppermost position in the drum 11 due to the rotation of the drum 11, the clothes W are self-weighted. As a result, it falls to the front half of the drum 11 and is washed by being beaten. At this time, since there is almost no water in the front half portion of the drum 11, water is easily pushed out from the laundry W by tap washing.

As described above, according to the present embodiment, the water discharge mechanism 28 of the circulation path 30 has the first water discharge port 46 that sprays water on the front side of the drum 11 and the second water discharge mechanism 46 that sprays water on the back side of the drum 11. Since the water discharge amount of the second water discharge port portion 47 is set to be larger than that of the first water discharge port portion 46, it is moved by the baffle 13 so as to be unevenly distributed on the back side. Washing water can be evenly permeated throughout the clothes W, and the effect of hitting and washing can be sufficiently exerted, so that washing and rinsing can be efficiently performed.

Further, in the early stage of the washing process, the amount of normal rotation of the drum 11 (rotation time) is set to increase as the amount (weight) of the clothes W increases. As the (weight) becomes larger, the drum 11 is moved to the back side in the drum 11 and falls to the back side where a large amount of washing water is accumulated, which promotes the dissolution of the detergent in the water and the washing water is washed. It becomes easier to penetrate W. As shown in FIG. 18, the permeation ratio of the wash water to the clothes W becomes worse as the weight of the clothes W increases. Accordingly, increasing the forward rotation time as the weight of the clothes W increases as in the present embodiment is effective in permeating the washing water into the clothes W.

Further, when the amount of bubbles detected by the bubble sensor 40 is equal to or larger than a predetermined amount, the control device 5 drives the circulation pump 25 by rotating the pump motor 25a at a speed that is a constant speed that is gradually reduced from the current set speed (the amount of circulating water is reduced). Therefore, it is possible to prevent excessive generation of bubbles in the drum 11 and deterioration of the cleaning effect.

Further, when the control device 5 observes the detected current value of the current transformer 51 and determines that the circulating pump 25 has air leakage, it sets the set speed of the pump motor 25a from the current set speed to a constant speed. Is changed to a reduced speed (the amount of circulating water is decreased), so that the circulation pump 25 can be prevented from being damaged.

Note that the control device 5 repeatedly executes the processing step S15 or the processing step S17 to stop the pump motor 25a when the rotation speed of the circulation pump 25 becomes equal to or lower than the lower limit value to continue the unnecessary control. It is designed to prevent it.

FIG. 20 shows a second embodiment of the present invention, and the same parts as those of the first embodiment (FIG. 17) are designated by the same reference numerals. In the second embodiment, the determination step S10, the processing step S11, the determination step S17, and the processing step S18 relating to the current transformer 51 (see FIG. 11) are deleted, and the current transformer 51 is omitted.

FIG. 21 shows a third embodiment of the present invention, in which the same parts as those in the first embodiment (FIGS. 14 to 16) are designated by the same reference numerals. In the third embodiment, in the initial stage of the washing process, the forward rotation times 20s, 30s and 40s of the drum 11 (see FIGS. 1 and 2) set according to the small, medium and large weight of the laundry are This is performed by dividing into a plurality of normal rotation times and stop times, and with this configuration, the generation of bubbles can be suppressed as much as possible.

As described above, according to the drum washing machine of the embodiment, the water discharge mechanism portion includes the first water discharge outlet portion and the second water discharge outlet portion, and the water discharge amount of the second water discharge outlet portion is the first water discharge outlet portion. Since it is set to be larger than the water discharge amount of, the washing water can be evenly penetrated throughout the clothes, and the tap washing effect can be fully exerted, so that washing and rinsing can be performed efficiently. You can

The present invention is not limited to the embodiments described above and shown in the drawings, and the following modifications and expansions are possible.
Instead of the baffle 13 of the above embodiment, a normal straight baffle may be used.

The number of baffles 13 may be other than three.
In the above embodiment, the rotation amount of the drum 11 is changed by changing the forward rotation time of the drum 11 in accordance with the weight of the laundry at the beginning of the washing process. The rotation amount of the drum 11 may be changed by changing the rolling speed.

It is very good to use a current sensor as the weight detecting means. Specifically, the control device 5 drives the washing machine motor 8 to rotate the drum 11, and based on the magnitude of the current detected by the current sensor at that time and the data recorded in advance in the control device 5, You may make it judge the weight of the laundry accommodated in 11.

The present invention can also be applied to a drum type washing machine with a drying function.
Besides, the present invention can be implemented with appropriate changes within the scope of the present invention.

In the drawings, 1 is an outer box, 5 is a control device (control means), 6 is a water tank, 8 is a washing machine motor, 11 is a drum, 13 is a baffle, 18 is a drain port (intake port), and 25 is a circulation pump. , 25a is a pump motor, 28 is a water discharge mechanism, 30 is a circulation path, 46 is a first water discharge port, and 47 is a second water discharge port.

Claims (1)

A bottomed cylindrical water tank that is elastically supported so that its central axis is located on the axis descending rearward, and the back side is closed.
A drum having a bottomed cylindrical shape, which is rotatably provided around the axis in the water tank and has a closed rear surface,
A washing machine motor that is provided outside the water tank and drives the drum;
A water discharge mechanism for watering the inside of the drum,
A drain port formed at the bottom of the water tank,
A circulation path formed so as to connect the drainage port section and the water discharge mechanism section,
A circulation pump that discharges water taken from the drainage port from the water discharge mechanism into the drum,
At the beginning of the washing process by detecting the weight of the clothes , water is sprinkled inside the drum by the water discharge mechanism, and the laundry stored in the drum is scraped up by the baffle by rotating the drum at a low speed. There repeated rows beating wash to be dropped, said when the weight of the clothes is large and a control device for setting so many rotation time of the drum in the beating wash,
Drum type washing machine.

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