JP7032480B2 - Drum type washing machine - Google Patents

Description

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

Generally, a drum-type washing machine is provided with a bottomed cylindrical water tank whose back side is closed. This water tank is elastically supported in the outer box so as to be located on an axis whose central axis descends toward the rear. A drum that is rotationally 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, for example, to extend straight in the anterior-posterior direction of the aquarium. Then, at the time of washing in the washing operation, the washing water in which the detergent is dissolved is stored in the water tank, and the drum is rotated to scrape the clothes, which are laundry containing the washing water, by the baffle and drop them to wash the clothes. Is done.

In a drum-type washing machine having such a baffle, it is important to sufficiently permeate the clothes with washing water in which a detergent is dissolved before dropping the washing machine from the baffle. For this reason, conventionally, a circulation path having a circulation pump that takes out the washing water from the bottom of the water tank and discharges it into the drum from the top of the water tank is provided, and in addition to the natural permeation of the washing water when the clothes are at the bottom of the drum, A configuration is considered in which forced permeation by sprinkling washing water into the drum by a circulation route is planned (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2008-113982

In the conventional configuration, the water tub is elastically supported in the outer box so that the central axis is located on the axis that descends toward the rear, so that the washing water tends to collect in the corners on the back side of the water tub. 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 in the water tank around its axis, the baffle also tilts downward toward the back side, and the clothes scraped up as the drum rotates are placed on the back side. It will be moved, and the clothes will tend to be unevenly distributed on the back side of the drum. Therefore, it has been difficult to evenly permeate the washing water into the entire clothes by simply sprinkling the washing water from the upper part of the water tank into the drum as in the conventional case. As a result, the effect of tapping the laundry may not be sufficiently obtained, and the washing efficiency is deteriorated. This is a problem that also occurs during rinsing.

The present invention has been made in view of the above circumstances, and an object thereof is to allow the washing water to permeate the entire laundry evenly by a circulation route and to obtain a sufficient tapping effect of the laundry. It is an object of the present invention to provide a drum-type washing machine capable of efficiently performing washing and rinsing.

The drum-type washing machine according to the embodiment is elastically supported so that the central axis is located on the axis descending toward the rear, and the bottomed cylindrical water tank in which the back side is closed and the axis are placed in the water tank. A bottomed cylindrical drum rotatably provided in the center and closed on the back side, a washing machine motor provided outside the water tank to drive the drum, and a water discharge mechanism portion for sprinkling water inside the drum. , A drainage port formed at the bottom of the water tank, a circulation path formed by connecting the drainage port and the water discharge mechanism portion, and water taken from the drainage port portion to the water discharge mechanism portion. It is provided with a circulation pump that discharges water from the drum toward the inside of the drum, and a control device that determines whether or not air is generated in the circulation pump. The control device applies to the circulation pump when the pump motor of the circulation pump is rotated to drive the circulation pump while the water supply to the water tank is stopped and a substantial washing operation is being performed. When it is determined that air is generated, the set speed of the pump motor is reduced from the current set speed, and when the rotation speed of the pump motor becomes equal to or less than the lower limit, the pump motor is stopped. Let me.

Longitudinal side view of the entire drum type washing machine showing the first embodiment of the present invention. Breaking perspective view of the entire drum-type washing machine Expanded plan view of a part of the drum Rear view of the aquarium cover Sectional drawing according to 5-5 of FIG. Sectional drawing according to 6-6 of FIG. Sectional drawing along with 7-7 of FIG. Sectional drawing along with 8-8 of FIG. E arrow view of FIG. F arrow view of FIG. Block diagram showing electrical configuration Rear view schematically showing the drum for explaining the operation Schematic side view of 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 The figure which shows the relationship between the amount of clothes and the penetration rate of washing water Current-characteristic characteristic diagram of pump motor Flow chart showing a second embodiment of the present invention Time chart showing a third embodiment of the present invention

Hereinafter, the first embodiment of the present invention will be described with reference to FIGS. 1 to 19.
First, FIGS. 1 and 2 show the overall structure of a drum-type washing machine. The outer box 1 of the drum-type washing machine is specifically composed of a base 1A made of synthetic resin and a box body 1B coupled to the base 1A. A laundry entrance / exit 2 is formed in a substantially central portion of the front surface (left side in FIG. 1) of the box body 1B, and a double glass structure door 3 for opening / closing the laundry entrance / exit 2 is provided. .. Further, an operation panel 4 is provided on the upper portion of the front surface portion of the box body 1B, and a control device 5 serving as a control means is provided on the back side thereof (inside the outer box 1).

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

A washing machine motor 8 is provided on the outside of the water tank 6 on the back side. The washing machine motor 8 is made of, for example, a direct current brushless motor, has an outer rotor type, and has a stator 8A and a rotor 8B. The stator 8A is attached to the outside of the back surface side 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.

A bottomed cylindrical drum 11 having a closed back surface is provided in the water tank 6. The outer center of the drum 11 on the back side is 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 forward and reverse by the washing machine motor 8. To. In this case, the washing machine motor 8 functions as a drive device for rotating the drum 11.

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

The front side of both the drum 11 and the water tank 6 is open. A liquid-filled 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 the opening on the front side of the water tank 6, and the opening 16a at the tip thereof is connected to the laundry inlet / outlet portion 2 by a bellows 17 made of an annular elastic material such as rubber. .. As a result, the laundry entrance / exit portion 2 is connected to the inside of the drum 11 via the bellows 17, the water tank cover 16 and the opening portion 14 of the drum 11.

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

The in-flight drain hose connection port 21 is formed in the upper part of the filter case 20, and a cap 22 is attached to the front end portion. The filter case 20 contains a lint filter (not shown) integrated with the cap 22 inside. Further, a drain valve 23 is connected to the lower part of the filter case 20, and a drain pipe 24 is connected to the outlet portion of the drain valve 23. The tip of the drainage pipe 24 faces the outside of the machine from the base 1A of the outer box 1 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 the water in the water tank 6 (drum 11) through the drain port portion 18, the in-machine drain hose 19, and the filter case 20. In the circulation pump 25 (the pump motor 25a is shown in FIG. 11), a discharge port 26 is formed on the peripheral side (upper part in the figure), and one end of the water supply hose 27 is connected to the discharge port 26. The intermediate portion of the water supply hose 27 extends upward from the peripheral side of the water tank cover 16, and the tip end portion is connected to the water discharge mechanism portion 28 formed on the water tank cover 16. The water discharge mechanism portion 28 is configured to sprinkle water inside the drum 11 as described later. As a result, the circulation path 30 is formed so as to connect the drainage port portion 18 and the water discharge mechanism portion 28. That is, the circulation path 30 is formed of a water tank 6, a drum 11, a drain port portion 18, an in-flight drain hose 19, a filter case 20, a water supply hose 27, and a water discharge mechanism portion 28, and the circulation pump 25 is located in the circulation path 30. It is provided as follows. 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 toward the inside of the drum 11 in a shower shape.

An air trap 31 is provided on the upper portion of the front portion of the filter case 20. The air trap 31 and the water level sensor 32 arranged at the uppermost portion in the outer box 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-flight drain hose 19, the filter case 20, the air trap 31, and the air tube 33, and functions as a water level detecting means. It has become.

A water supply valve 34 and a water supply case 35 are provided at the uppermost portion of the outer box 1. The water supply valve 34 is configured to be connected to an external water supply hose (not shown) connected to a faucet of a water supply (not shown) at the inlet portion, and one end of a connection pipe 36 is connected to the outlet portion. The other end of the connection pipe 36 is connected to the water supply case 35. The water supply case 35 has a detergent storage unit (not shown) inside. One end of the in-flight water supply hose 37 is connected to the water supply case 35, and the other end of the in-flight water supply hose 37 is connected to the upper part 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 storage portion of the water supply case 35, and the in-flight 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 above-mentioned baffle 13 extends in the front-rear direction along the axis of the water tank 6 and protrudes toward the rotation center axis side 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 portion 13C. In this 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 surface portion on the counterclockwise direction side (for example, the arrow B direction in FIGS. 2 and 3) when viewed from the front.

As shown in FIGS. 1 to 3, the central ridge portion 13C of the baffle 13 is curved like a sine wave when viewed from a plane direction. Specifically, when the central ridge portion 13C is divided into three so as to arrange the regions in the longitudinal direction, the first ridge portion 13Ca, the second ridge portion 13Cb, and the third ridge portion 13Cc It is configured. The first ridge portion 13Ca is located on one side in the circumferential direction (for example, the side in the direction of arrow A 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 tank 6. Moreover, it is located on the front side of the drum 11. The second ridge portion 13Cb is located on the other side in the circumferential direction with respect to the line L along the axis (for example, the side in the direction of arrow B when the drum type washing machine is viewed from the front) and is located on the back side of the drum 11. is doing. The third ridge portion 13Cc is located between the first ridge portion 13Ca and the second ridge portion 13Cc. Further, the first ridge portion 13Ca and the third ridge portion 13Cc are connected by a smooth curve, and the second ridge portion 13Cb and the third ridge portion 13Cc are also connected by a smooth curve. Then, the first recess 13E is formed by the first ridge 13Ca and the third ridge 13Cc, and the first recess 13E is formed by the second ridge 13Cb and the third ridge 13Cc. A second recess 13F in the opposite direction to the above is formed.

As shown in FIG. 1, an air trap 39 communicating with the inside of the water tank 6 is provided in the upper part on the back surface side of the water tank 6. The air trap 39 and the bubble sensor 40 arranged at the uppermost portion in 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 in 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 unit 28 will be described with reference to FIGS. 4 to 10.
As shown in FIGS. 1, 4, 5 and 6, the water discharge mechanism portion 28 includes protrusions 42 and 42 integrally formed on the outer peripheral portion of the inner surface of the water tank cover 16 and the protrusions thereof. It is provided with a closing plate 44 which is attached (welded) to the tips of the 42 and 42 to form the water channel 43. A connecting port 45 (see FIG. 5) communicating with the water channel 43 is formed in the left portion (right portion in FIG. 4) of the water tank cover 16 in FIG. 2, and a water supply hose 27 is formed therein. It is connected. A first water discharge port 46 (see FIG. 7) is formed together with the closing plate 44 at a portion located above the connecting port 45 of the water tank cover 16, and the first water discharge port 46 is a drum 11. It has a diffusion plate portion 46a facing inward. At the portion of the water tank cover 16 opposite to the first outlet portion 46 (the right portion in FIG. 2 and the left portion in FIG. 4), the second outlet portion 47 together with the closing plate 44 is located. (See FIG. 8) is formed, and the second water discharge port portion 47 has a diffusion plate portion 47a facing into the drum 11. In this case, as shown in FIGS. 12 and 13, the first water discharge port 46 and the second water discharge port 47 have the water drop point of the second water discharge path Pa by the first water discharge port 46. It is set to be 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 outlet 46 and the second outlet 47 are closer to the opening of the second outlet 47 than the opening of the first outlet 46. Is large, and the discharge flow rate of the second outlet portion 47 is set to be larger than the discharge flow rate of the first outlet portion 46. As shown in FIG. 8, the second water discharge port portion 47 is formed with a water passage hole 47b for injecting washing water into the rear glass 3a of the door 3. Bubbles adhering to the rear glass 3a of the door 3 are flushed off by the jet water from the water passage hole 47b of the second water discharge port 47.

FIG. 11 shows the 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 has various operation signals from the operation unit 48 including various keys (switches) provided on the operation panel 4 (see FIG. 1), water level detection signals from the water level sensor 32, and foam sensors 40. A bubble 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 the 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 program 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 has a display unit 52 provided on the operation panel 4, for example, a liquid crystal panel, in addition to the amount of detergent used according to the weight detection of the laundry described later, a set operation course, and the rest of the operation. Various information such as time, reservation time, and current time are displayed.

Next, the operation of the above configuration will be described with reference to the time chart 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 selective operation. The control device 5 first detects the weight of the laundry (clothes) based on the signal output from the operation unit 48 (processing step S1 in FIG. 17). To detect the weight of the laundry, the drum 11 is rotated to a predetermined rotation speed, the time required for it, and then the driving of the drum 11 by the washing machine motor 8 is stopped to cause the drum 11 to coast and rotate. It is calculated from the time required for the rotation speed of the washing machine to decrease to a predetermined rotation speed, and the weight of the washing machine is detected by the rotation load of the washing machine motor 8. After that, from the detection result of the laundry weight, the amount of detergent is determined, 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 detecting means for detecting 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 a result of determining the detergent amount (processing step S2 in FIG. 17).

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. 14, respectively. 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 add the detergent amount displayed on the water supply case 35 based on the detergent amount display by the display unit 52 (determination step S3 in FIG. 17). ), After the lapse of a predetermined time, the water supply valve 34 is opened to supply tap water 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 corresponding to the determination of the amount of detergent by the control device 5. Here, since the drum 11 is provided so as to be rotatable around the axis of the water tank 6 in which the central axis descends toward the rear, the water to be supplied is the back side (second half) of the drum 11 (water tank 6). It collects on the side) and becomes shallower toward the front side (front half side) of the drum 11, and there is almost no or little water in the vicinity of the front side (front end side) of the drum 11.

Upon the start of water supply, the control device 5 tells the washing machine motor 8 a cycle of forward rotation 15 s (seconds) at low speed (for example, 40 to 60 rpm), stop 1 s, reverse rotation 15 s at low speed (for example, 40 to 60 rpm), and stop 1 s. Drives the drum 11 in rotation (see processing step S5 in FIG. 17 and (c) in FIGS. 14 to 16).

After that, when the detected water level of the water level sensor 32 reaches the driveable water level of the circulation pump 25 (“YES” in the determination step S6 of FIG. 17), the control device 5 has detected a predetermined amount of bubbles. Whether or not it is determined, the pump motor 25a is rotated to drive the circulation pump 25 (see (b) of FIGS. 14 to 16). In this case, when the amount of detected bubbles in the bubble sensor 40 is less than a predetermined amount (“NO” in the 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 detected foam of the foam sensor 40 is equal to or more than a predetermined amount (“YES” in the determination step S7), the control device 5 sequentially sets the pump motor 25a at a constant speed (for example, 100 rpm) from the current set speed (for example, 2000 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 swelling of the circulation pump 25 (determination step S10 in FIG. 17). The washing water in which the detergent supplied in the water tank 6, that is, the drum 11 is dissolved is agitated by the laundry that is scraped up and dropped by the baffle 13, and is circulated by the circulation pump 25 to generate bubbles. If this is excessive, not only the cleaning effect is reduced, but also the circulation pump 25 is damaged. When bubbles are excessively generated in the water tank 6 and the bubbles enter the circulation pump 25, the current value of the pump motor 25a fluctuates greatly and then becomes almost constant to a low value of a predetermined value or less, as shown in FIG. As a result, the control device 5 determines whether or not air bubbles have occurred in the circulation pump 25 (determination step S10 in FIG. 17).

When the control device 5 determines that air is generated in the circulation pump 25 (“YES” in the determination step S10), the control device 5 sets the set speed of the pump motor 25a from the current set speed to a constant speed (“YES” in the determination step S10). The speed is changed to a reduced speed (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 is generated in the circulation pump 25 (“NO” in the determination step S10), the control device 5 directly proceeds to the determination step S12.

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

In the initial stage of this washing process, the control device 5 rotates the drum 11 at a low speed (for example, 40 to 60 rpm) in a normal direction for a time 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 rotates the washing machine motor 8 forward for 20 s (seconds) (see FIG. 14 (c)), and the weight of the laundry is medium (see FIG. 14 (c)). For example, in the case of 3 kg), the washing machine motor 8 is rotated forward for 30 s (seconds) (see FIG. 15 (c)), and when the weight of the laundry is large (for example, 6 kg), the washing machine motor 8 is rotated for 40 s. (Second) Rotate forward (see FIG. 16 (c)). That is, at the initial stage of the washing process, the control device 5 selects the rotation direction of the drum 11 in the normal rotation direction and changes the normal rotation time of the washing machine motor 8 according to the weight of the laundry. It changes the amount of rotation of.

As a result, the laundry previously stored in the drum 11 is repeatedly tapped and washed by the baffle 13. Further, as described above, the control device 5 drives the circulation pump 25 during the washing process to collect the water in the water tank 6 taken from the drainage port 18 of the water tank 6 at the upper part 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 side and the back side of the drum 11.

After that, the control device 5 executes the same determination step S15, processing step S16, determination step S17, and processing step S18 as the above-mentioned determination step S7, processing step S9, determination step S10, and processing step S11. After that, the control device 5 causes the washing machine motor 8 to perform a normal operation of repeating 30s forward rotation, 1s stop, 30s reverse rotation, and 1s stop (processing step S19).

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

Next, the control device 5 executes the rinsing process. In the rinsing process, the control device 5 repeatedly supplies, rinses, and drains water in the same manner as in the washing process. Then, the control device 5 executes the dehydration process. In the dehydration stroke, the control device 5 rotates the drum 11 in one direction at a high speed (for example, 700 to 1500 rpm) to perform centrifugal dehydration of the laundry. When the dehydration process is completed, the normal driving course (washing operation) is completed.

12 and 13 show the state of the clothes W, which is the laundry, at the initial stage of the washing process of the washing operation. When the drum 11 rotates (forward rotation) in the direction of arrow A, the clothing W moves from the front to the rear (in the 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 clothing W is not moved to the rear end side of the second recess 13F even if the drum 11 rotates. It fits in the second recess 13F. Further, since the second recess 13F is on the latter half side of the baffle 13, the clothes W housed in the second recess 13F become near the uppermost position in the drum 11 due to the rotation of the drum 11, and the laundry W Due to its own weight, it falls to the latter half side of the drum 11 and is beaten and washed. At this time, since a large amount of washing water is accumulated on the latter half side of the drum 11, the water easily penetrates into the laundry W. In this case, since the forward rotation amount (rotation time) of the drum 11 is set to increase as the amount (weight) of the clothes W increases, the clothes W become larger as the amount (weight) of the clothes W increases. It is moved to the back side 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 makes it easier for the washing water to permeate the clothes W. Moreover, the amount of water sprinkled on the second water discharge port 47 sprinkled on the back side of the drum 11 is set to be larger than the amount of water discharged on the first water discharge port 46 sprinkled on the front side of the drum 11. Therefore, the washing water can be evenly permeated into the entire clothes W.

Next, when the drum 11 rotates (reverses) in the direction of arrow B, the clothing W moves from the rear 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 side of the baffle 13, the clothing W is not moved to the front end portion of the first recess 13E even if 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 clothing W housed in the first recess 13E becomes near the uppermost position in the drum 11 due to the rotation of the drum 11, the clothing W becomes its own weight. It falls to the front half side of the drum 11 and is beaten and washed. At this time, since there is almost no water in the first half of the drum 11, water is likely to be extruded from the laundry W by tapping and washing.

As described above, according to the present embodiment, the water discharge mechanism portion 28 of the circulation path 30 has a first water discharge port portion 46 that sprinkles water on the front side of the drum 11 and a second discharge portion that sprinkles water on the back side in the drum 11. Since the water outlet portion 47 is provided and the amount of water discharged from the second outlet portion 47 is set to be larger than the amount of water discharged from the first outlet portion 46, the baffle 13 is moved so as to be unevenly distributed on the back side. The washing water can be evenly permeated into the clothes W, the tapping effect can be sufficiently exerted, and the washing and rinsing can be efficiently performed.

Further, in the initial stage of the washing process, the amount (weight) of the clothes W is set so that the forward rotation amount (rotation time) of the drum 11 increases as the amount (weight) of the clothes W increases. The larger the (weight), the more it is moved to the back side in the drum 11 and falls to the back side where a lot of washing water is stored, which promotes the dissolution of the detergent in the water and the washing water is the clothes. It becomes easy to penetrate W. As shown in FIG. 18, the permeation ratio of the washing water to the clothes W becomes worse as the weight of the clothes W increases. Thereby, as in the present embodiment, increasing the normal rotation time as the weight of the clothes W increases is effective in infiltrating the clothes W with the washing water.

Further, the control device 5 drives the circulation pump 25 by rotating the pump motor 25a at a speed in which a constant speed is sequentially reduced from the currently set speed when the detected foam of the foam sensor 40 is a predetermined amount or more (circulating water amount). Since it is reduced), it is possible to prevent excessive bubbles from being generated in the drum 11 to reduce the cleaning effect.

Further, when the control device 5 observes the detected current value of the current transformer 51 and determines that air is generated in the circulation pump 25, the control device 5 sets the set speed of the pump motor 25a to a constant speed from the current set speed. Since the speed is changed to a reduced speed (reducing the amount of circulating water), it is possible to prevent the circulation pump 25 from being damaged.

When the rotation speed of the circulation pump 25 becomes equal to or lower than the lower limit by repeatedly executing the processing step S15 or the processing step S17, the control device 5 stops the pump motor 25a to continue unnecessary control. It is designed to prevent.

FIG. 20 is 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 this second embodiment, the determination step S10, the processing step S11, the determination step S17, and the processing step S18 regarding the current transformer 51 (see FIG. 11) are deleted, and the current transformer 51 is omitted.

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

As described above, according to the drum washing machine of the embodiment, the water discharge mechanism portion includes a first water discharge port portion and a second water discharge port portion, and the amount of water discharged from the second water discharge port portion is the first water discharge port portion. Since the amount of water discharged is set to be larger than the amount of water discharged from the clothes, the washing water can be evenly permeated into the clothes, the washing effect can be fully exerted, and the washing and rinsing can be performed efficiently. Can be done.

The present invention is not limited to the above-mentioned embodiment and shown in the drawings, and the following modifications and extensions are possible.
Instead of the baffle 13 of the above embodiment, a normal linear baffle may be used.

The number of baffles 13 may be other than three.
In the above embodiment, at the initial stage of the washing process, the rotation amount of the drum 11 is changed by changing the normal rotation time of the drum 11 according to the weight of the laundry. The amount of rotation 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 the drum is based on the magnitude of the detection current of the current sensor at that time and the data recorded in advance in the control device 5. The weight of the laundry housed in 11 may be determined.

The present invention can also be applied to a drum-type washing machine with a drying function.
In addition, it may be appropriately modified and carried out without departing from the gist of the present invention.

In the drawing, 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 drainage port (intake port), and 25 is a circulation pump. , 25a is a pump motor, 28 is a water discharge mechanism part, 30 is a circulation path, 46 is a first water discharge port part, and 47 is a second water discharge port part.

Claims (1)

A bottomed cylindrical water tank that is elastically supported so that the central axis is located on the axis that descends toward the rear and the back side is closed.
A bottomed cylindrical drum that is rotatably provided around the axis in the water tank and has a closed back side.
A washing machine motor provided on the outside of the water tank to drive the drum, and
A water discharge mechanism that sprinkles water inside the drum,
The drainage port formed at the bottom of the water tank and
A circulation path formed by connecting the drainage port portion and the water discharge mechanism portion,
A circulation pump that discharges water taken from the drainage port portion from the water discharge mechanism portion toward the inside of the drum.
The circulation pump is provided with a control device for determining whether or not air is generated.
The control device applies to the circulation pump when the pump motor of the circulation pump is rotated to drive the circulation pump while the water supply to the water tank is stopped and the washing operation is substantially performed. When it is determined that air is generated, the set speed of the pump motor is reduced from the current set speed, and when the rotation speed of the pump motor becomes equal to or less than the lower limit, the pump motor is stopped. Let,
Drum type washing machine.

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