JP6967706B2 - Washing machine - Google Patents

Description

The present invention relates to a washing machine that uses warm water to wash clothes and the like.

Conventionally, as this kind of washing machine, a washing machine that makes it easy to remove stains by raising the temperature of the washing liquid has been proposed (see, for example, Patent Document 1).

FIG. 10 is a cross-sectional view of a conventional washing machine. In FIG. 10, a water supply port 62 for supplying water to the water tank 63 and a switching valve 66 for branching a water supply path from the water supply port 62 to the water tank 63 into a main water channel 64 and a bypass path 65 are provided in the middle of the bypass path 65. A heater 67 is provided.

However, this configuration has a problem that the flow path for supplying the heated washing liquid to the water tank 63 becomes complicated.

Japanese Unexamined Patent Publication No. 2006-43100

However, this configuration has a problem that the flow path for supplying the heated washing liquid to the water tank 63 becomes complicated.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a washing machine capable of simplifying the structure.

In order to solve the above-mentioned conventional problems, the washing machine of the present invention includes a housing, a water tub arranged in the housing, a washing tub rotatably arranged in the water tub, and the water tub. A pulsator rotatably arranged on the inner bottom, a washing tub and a motor for rotationally driving the pulsator, a circulation path connected to the washing tub so that water in the washing tub can be circulated, and the circulation. comprising a circulation pump to form a stream of water in the road, is disposed in the water tank, a heating device for heating the washing liquid, the drive means, said circulating pump, and a control device for controlling the heating device, wherein It has a discharge port located in the middle of the washing tub, and when the amount of water in the washing tub is less than a predetermined amount , the control device operates only the pulsator after energizing the heating device. When the amount of water in the washing tub is larger than a predetermined amount, the circulation pump is operated at the same time as the energization of the heating device.

As a result, when the amount of washing liquid in the washing tub is less than a predetermined amount, the temperature can be uniformly raised without using wasteful power by operating only the pulsator after operating the heating device. .. In addition, when the amount of washing liquid in the washing tub is larger than the predetermined amount, the washing machine in which the upper and lower parts of the washing tub are mixed and the temperature rises uniformly by operating the heating device and the circulation pump at the same time. Can be provided.

The washing machine of the present invention can provide a washing machine capable of reducing the temperature difference of the washing liquid in the washing tub and suppressing unevenness in washing and rinsing performance.

A perspective view of the washing machine according to the first embodiment of the present invention as viewed from the rear side with the door body removed. Cross section of the washing machine Cross-sectional view showing the circulation state of the washing liquid of the washing machine Top view of the washing machine's aquarium from above Enlarged plan view of the main part of the washing machine Enlarged sectional view of the main part of the washing machine A perspective view of the washing machine's aquarium from above Enlarged plan view of the main part of the water tank of the washing machine according to the second embodiment of the present invention as viewed from above. Enlarged sectional view of the main part of the washing machine Cross section of a conventional washing machine

The first invention is a housing, a water tub disposed in the housing, a washing tub rotatably arranged in the water tub, and rotatably arranged at the inner bottom of the washing tub. A pulsator, a washing tub, a motor for rotating the pulsator, a circulation path for circulating the washing liquid in the washing tub, a circulation pump for forming a flow of the washing liquid in the circulation path, and an arrangement in the water tub. Set up and washing liquid
A heating device for heating, said motor, said circulation pump, and a control device for controlling the heating device has a discharge opening located in the middle portion of the washing tub, the control device, the washing tub When the amount of water in the washing tub is less than the predetermined amount, only the pulsator is operated after the heating device is energized, and when the amount of water in the washing tub is larger than the predetermined amount, the heating device is energized at the same time. It operates the circulation pump.

As a result, when the amount of washing liquid in the washing tub is less than a predetermined amount, the temperature can be uniformly raised without using wasteful power by operating only the pulsator after operating the heating device. .. Further, when the amount of washing liquid in the washing tub is larger than a predetermined amount, the washing water in the upper part and the lower part in the washing tub are mixed by operating the heating device and the circulation pump at the same time, and the temperature can be uniformly raised. ..

The second invention is a housing, a water tub disposed in the housing, a washing tub rotatably arranged in the water tub, and rotatably arranged at the inner bottom of the washing tub. A pulsator, a washing tub, a motor for rotating the pulsator, a circulation path for circulating the washing liquid in the washing tub, a circulation pump for forming a flow of the washing liquid in the circulation path, and an arrangement in the water tub. It is provided and includes a heating device for heating the washing liquid, the motor, the circulation pump, and a control device for controlling the heating device, and the control device is used when the amount of clothes in the washing tub is less than a predetermined amount. Operates the pulsator after the heating device is energized, and when the amount of clothes in the washing tub is larger than a predetermined amount, the circulation pump is operated at the same time as the energization of the heating device.

As a result, when the amount of clothes in the washing tub is less than a predetermined amount, the temperature can be uniformly raised without using wasteful power by operating only the pulsator after operating the heating device. .. Further, when the amount of clothes in the washing tub is larger than a predetermined amount, the washing water in the upper part and the lower part in the washing tub are mixed by operating the heating device and the circulation pump at the same time, and the temperature can be uniformly raised.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the present embodiment.

FIG. 1 is an exploded perspective view of the washing machine according to the embodiment of the present invention as viewed from the back surface, and FIG. 2 is a vertical sectional view of the washing machine.

The housing 1 is formed in a square shape having a front surface, both side surfaces, and a back surface, an opening 2 is formed on the back surface side, and the opening 2 is closed by a door body 3 so as to be openable and closable. By removing the door body 3, the inside of the housing 1 can be seen from the opening 2.

In the present embodiment, since the opening 2 is formed on the back surface side of the housing 1, the housing 1 is rotated to a position where the inside of the housing 1 can be maintained through the opening 2, and the inside of the housing 1 is maintained. To do. By arranging the door body 3 on the back surface, the door body 3 does not enter the user's field of view when the washing machine is installed, and does not spoil the aesthetic appearance.

In the present embodiment, the opening 2 is formed on the back surface side of the housing 1, but it may be formed on the side surface. If it is formed on the side surface, the amount of movement of the housing 1 during maintenance can be reduced, and inspection workability can be improved.

The upper case 4 is mounted above the housing 1. A bottomed cylindrical water tank 5 made of flame-retardant synthetic resin is supported in the space surrounded by the housing 1 and the upper case 4, and a rotating shaft 6 is arranged on the central axis of the water tank 5. Has been done. A washing tub 7 connected to the rotating shaft 6 is installed in the water tub 5, and a pulsator 8 connected to the rotating shaft 6 is arranged at the bottom of the washing tub 7. A motor 9 is arranged below the water tub 5, a rotary shaft 6 is connected to the motor 9, and the washing tub 7 and the pulsator 8 are rotationally driven by the motor 9.

A loading port 10 for loading laundry into the washing tub 7 is formed on the upper surface of the water tub 5, and the loading port 10 is closed by the lid 11 so as to be openable and closable. The upper case 4 is formed with an outer loading port (not shown) for loading the laundry into the washing tub 7, and the outer loading port is closed by the outer lid 12 so as to be openable and closable.

The washing tub 7 is made of a metal having corrosion resistance, and in the present embodiment, the washing tub 7 is provided with a cylindrical side wall 7a made of stainless steel and a bottom wall 7b made of a flame-retardant synthetic resin, and the side wall 7a and the bottom wall 7b are provided. It is integrally fixed and configured. The washing tub 7 is provided with a large number of dehydration holes 13 on the side wall 7a, and an annular fluid balancer 14 for reducing dehydration vibration is attached to the upper portion thereof.

The washing tub 7 is provided with a circulation water channel cover 15 at positions facing each other of the side wall 7a, and the washing tub 7 is provided with a circulation water channel cover 15.
A circulating water channel (not shown) is formed between the side surface of the water channel and the circulating water channel cover 15. By attaching a pair of circulation water channel covers 15 to the washing tub 7, two circulation water channels are formed so as to face each other. The circulation water channel cover 15 and the circulation water channel are preferably formed to have the same shape in order to suppress the occurrence of imbalance during rotation of the washing tub 7, but the shapes may be different as necessary.

The circulation water channel cover 15 is formed with a discharge port 16 at a position corresponding to the intermediate portion of the washing tub 7. The discharge port 16 may be formed at either or both of the positions corresponding to the upper part or the middle part of the washing tub 7.

A blade 8a is integrally formed in the lower part of the pulsator 8. When the motor 9 rotates the pulsator 8, the washing water is pushed out to the outer peripheral side by the centrifugal force of the blade 8a to circulate in the circulation water channel and circulate in the circulation water channel. The washing liquid is discharged from the discharge port 16 into the washing tub 7 and sprinkled with water.

A recess 17 is formed in the bottom of the water tank 5 in a substantially arc shape with the rotation axis 6 as the center, and the bottom of the water tank 5 is formed so as to be inclined so as to be gradually lowered toward the recess 17. A drainage port 18 is formed in the recess 17 on one end side of the recess 17, and the bottom surface of the recess 17 is formed so as to be inclined so as to be gradually lowered toward the drain port 18. The drainage port 18 is formed in the recess 17 at a position on the leading side in the rotation direction of the washing tub 7 during dehydration. The rotation direction of the washing tub 7 during dehydration is a clockwise direction when the washing tub 7 is viewed from above, and is the A direction indicated by an arrow in FIG. 7.

In the recess 17 of the water tank 5, a mounting portion 20 to which the heating device 19 is mounted is integrally bulged upward from the bottom of the recess 17 of the water tank 5. The heating device 19 is for heating the washing water supplied into the water tank 5, and is composed of a heater.

The mounting portion 20 is formed from the side surface of the water tank 5 to the recess 17, and is formed to bulge upward from the bottom surface of the recess 17. The mounting portion 20 has a first side surface 20a substantially orthogonal to the rotation direction of the washing tub 7 and a second side surface 20b substantially orthogonal to the first side surface 20a. The first side surface 20a is configured to be inclined toward the rotation direction side of the washing tub 7 from the bottom surface side upward. The second side surface 20b is formed in a substantially vertical planar shape, and the second side surface 20b is formed with an opening 21 into which the heating device 19 is inserted from the outside of the water tank 5.

In the heating device 19, the heater wire is formed in a meandering shape, and both ends thereof are fixed to a mounting plate 22 having an insulating / insulating function. A temperature sensor 23 composed of a thermistor is mounted on the mounting plate 22, and the temperature of the heating device 19 is detected by the temperature sensor 23. The temperature sensor 23 is arranged at substantially the center of both ends of the heater wire so that the temperature of the heating device 19 can be accurately detected. A sealing material (not shown) is provided on the outer peripheral portion of the mounting plate 22, and the mounting plate 22 is watertightly attached to the peripheral edge of the opening 21 of the second side surface 20b of the mounting portion 20 by the sealing material.

The water tank 5 is mounted on the housing 1 so that the opening 21 of the mounting portion 20 is located at a position facing the door body 3. When the door body 3 is opened, the opening 21 of the mounting portion 20 faces the opening 2 of the housing 1, and the heating device 19 mounted on the opening 21 can be maintained.

A heat shield plate 24 made of metal or stainless steel in the present embodiment is disposed at a lower position of the heating device 19, and the heat shield plate 24 is in a state of having a gap between the heat shield plate 24 and the bottom surface of the recess 17. It is fixed. By disposing the heat shield plate 24 between the heating device 19 and the bottom surface of the recess 17, it is possible to suppress the heat generated by the heating device 19 from being directly transmitted to the recess 17, and the heat deterioration of the bottom of the water tank 5 can be prevented. It can be suppressed.

The heating plate 25 is formed with a through hole 25 g at a position above the temperature sensor 23. Since the washing liquid heated by the heating device 19 passes upward from the through hole 25 g, the heated washing liquid does not stay around the temperature sensor 23, and the temperature sensor 23 accurately detects the temperature of the washing liquid. Can be done.

A circulation water port 32 is formed between the heat shield plate 24 and the side wall of the recess 17 in the vicinity of the heating device 19 of the recess 17. A circulation pump 27 is connected to the circulation water port 32, and one end of the circulation path 28 is connected to the circulation pump 27. The circulation path 28 is arranged outside the water tank 5, and the other end of the circulation path 28 is connected to the water injection port 29 formed in the vicinity of the inlet 10, and the washing liquid is poured from the water injection port 29 to the washing tub 7 by the circulation pump 27. Supply the laundry inside from above.

The water injection port 29 is arranged above the discharge port 16 of the circulation water channel. The circulation amount of the washing liquid by the circulation pump 27 is set to be larger than the circulation amount of the washing liquid in the circulation water channel. As a result, the amount of the washing liquid supplied from the water injection port 29 is large, and the washing liquid is supplied from a high position. It can be wrapped in a large amount of foam to act on dirt and improve cleaning performance.

An operation display device 30 is arranged at the rear of the upper surface of the upper case 4, and the operation display device 30 is operated to set various operation courses and display the set operation course and the like. A control device 33 is arranged at a position facing the opening 2 of the housing 1, and the control device 33 executes the operation course selected by the operation display device 30.

In the present embodiment, the operation course executed by the control device 33 includes a course in which the washing liquid is heated for washing and a course in which the washing liquid is not heated for washing.

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

The outer lid 12 and the lid 11 are opened, the laundry is put into the washing tub 7 from the charging port 10, the outer lid 12 and the lid 11 are closed, and the power switch (not shown) of the operation display device 30 is operated. And turn on the power. The operation display device 30 selects an operation course or the like, and operates a start switch (not shown) to start operation.

When the operation is started, after detecting the amount of the loaded laundry, the water supply means (not shown) is activated to start the water supply, and the water tank 5 together with the detergent charged in the detergent case (not shown). The washing liquid is supplied inside.

When a predetermined amount of washing liquid is stored in the water tank 5, the circulation pump 27 operates and the washing liquid is injected from the water injection port 29 (see FIG. 3). Since the washing liquid from the water injection port 29 is supplied from a high position, it hits the laundry in the washing tub 7 and foams, and the foam penetrates deep into the fibers of the laundry, wraps the dirt, and floats the dirt to wash it off.

The amount of water supplied to the water tub 5 is set according to the amount of laundry put into the washing tub 7, and when a predetermined water level is detected by the water level sensor (not shown), the water supply is stopped and the motor 9 is driven. The pulsator 8 is alternately rotated in the forward and reverse directions. The rotation of the pulsator 8 stirs the laundry in the washing tub 7 together with the washing liquid to wash the laundry.

The operation of the circulation pump 27 is continued even in the washing step. The foamed washing liquid can be circulated to cause the foam to act on the dirt, and the dirt can be removed efficiently.

The washing process is continued for a predetermined time, and when the washing is completed, the drain valve (not shown) is opened to drain water. When drainage is complete, dehydration is performed. Dehydration is performed by rotating the washing tub 7 in one direction, and in the present embodiment, rotating the washing tub 7 clockwise at high speed when viewed from above.

After dehydration, the water supply means is operated to supply a predetermined amount of water to the washing tub 7, a rinsing step is performed, a dehydration step is further performed, and each washing step is completed.

When a course in which the washing liquid is heated for washing is selected as the operation course, a heating step for heating the washing liquid is performed in the washing step. When the operation is started, the amount of the loaded laundry is detected, and water is supplied into the water tank 5 according to the amount of the loaded laundry. Along with the water supply, the heating device 19 is energized to heat the washing liquid in the water tank 5.

The washing liquid heated by the heating device 19 moves upward. Along with this, the washing liquid having a low temperature moves to the lower part of the washing tub 7. At this time, the heating device 19 and the circulation pump 27 are operated at the same time, and the washing liquid having a low temperature at the bottom of the washing tub 7 is circulated by the circulation pump 27 and supplied into the washing tub 7 from the water injection port 29. As a result, the washing liquids in the upper part and the lower part in the washing tub 7 are mixed, and the temperature can be uniformly raised.

When the amount of clothes in the washing tub 7 is larger than a predetermined amount, the temperature difference between the washing liquid contained in the clothes in the upper part and the lower part in the washing tub 7 becomes large. On the contrary, when the amount of clothes in the washing tub 7 is less than a predetermined amount, the temperature difference of the washing liquid contained in the clothes between the upper part and the lower part in the washing tub 7 becomes relatively small.

Therefore, when the amount of clothes in the washing tub 7 is larger than a predetermined amount, the heating device 19 and the circulation pump 27 are operated at the same time to make the temperature of the washing liquid contained in the upper and lower clothes in the washing tub 7 uniform. Can be. On the other hand, when the amount of clothes in the washing tub 7 is less than a predetermined amount, only the heating device 19 is operated to uniformly raise the temperature of the washing liquid contained in the clothes without using wasted electric power. be able to.

In the present embodiment, the predetermined amount of clothes is about 1/5 of the weight of the laundry having a washing / dehydrating capacity as a result of various experiments. More specifically, an experiment was conducted using a washing machine having a washing / dehydrating capacity of 10 kg and 12 kg, and as a result, a predetermined amount was set to 2 kg.

When the amount of the washing liquid in the washing tub 7 is larger than the predetermined amount, the temperature difference between the upper part and the lower part in the washing tub 7 becomes larger. On the contrary, when the amount of the washing liquid in the washing tub 7 is smaller than the predetermined amount, the temperature difference between the upper part and the lower part in the washing tub 7 becomes relatively small.

Therefore, when the amount of the washing liquid in the washing tub 7 is larger than the predetermined amount, the heating device 19 and the circulation pump 27 are operated at the same time. As a result, the washing water in the upper part and the lower part in the washing tub 7 are mixed, and the temperature can be uniformly raised. On the other hand, when the amount of the washing liquid in the washing tub 7 is less than a predetermined amount, the temperature can be uniformly raised without using wasteful power by operating only the heating device 19.

In the present embodiment, as a result of various experiments, the predetermined amount of the washing liquid is set to about 1/4 of the washing liquid required for washing the laundry having a washing / dehydrating capacity. As a more specific liquid, an experiment was conducted using a washing machine having a washing / dehydrating capacity of 10 kg and 12 kg, and as a result, a predetermined amount was set to 30 L.

When the amount of clothes to be washed is small and the amount of washing liquid required for washing is small, the height of the clothes in the washing liquid in the washing tub 7 is sufficiently lower than the height of the discharge port 16, and the pulsator 8 is operated. By doing so, the washing liquid is discharged and sprinkled from the discharge port 16 into the washing tub 7.

On the contrary, when the amount of clothes to be washed is large and the amount of washing liquid required for washing is large, the clothes in the washing liquid in the washing tub 7 are sufficiently higher than the height of the discharge port 16, and the circulation pump 27 is used. By operating the washing liquid, the washing liquid is sprinkled into the washing tub 7 from the water injection port 29.

Therefore, when the amount of clothes in the washing tub 7 is small, the temperature can be uniformly raised without using wasteful power by operating only the pulsator 8 after operating the heating device 19. Further, when the amount of clothes in the washing tub 7 is large, by operating the heating device 19 and the circulation pump 27 at the same time, the washing liquids in the upper part and the lower part in the washing tub 7 are mixed and the temperature can be uniformly raised. ..

In the heating step, the washing liquid is heated by the heating device 19, and is heated to a predetermined temperature suitable for washing, in the present embodiment, to about 15 ° C. or about 40 ° C.

When the washing liquid reaches a constant temperature slightly lower than the predetermined temperature, the circulation pump 27 is operated to circulate the washing liquid and supply it to the laundry from the water injection port 29. Since the warm washing liquid is circulated, the powder detergent can be efficiently dissolved, the undissolved residue of the powder detergent can be suppressed, and the washing efficiency can be improved.

Since the washing liquid supplied from the water injection port 29 is supplied to the laundry from a high position, it hits the laundry and foams, and the foam permeates the laundry to wash away the dirt adhering to the back of the fiber. Since the washing liquid is warmed, the enzyme of the detergent is activated and the detergency can be improved.

When the washing liquid reaches a predetermined temperature, the pulsator 8 is alternately rotated in the forward and reverse directions. The rotation of the pulsator 8 stirs the laundry in the washing tub 7 with the washing water to wash the laundry. Since the washing liquid is heated and stirred, it is possible to suppress the undissolved residue of the powder detergent. Even in this state, the operation of the circulation pump 27 is continued to improve the cleaning efficiency.

When the pulsator 8 rotates, the washing liquid is pushed toward the outer peripheral side by the centrifugal force due to the rotation of the blades 8a, rises in the circulating water channel, and is sprinkled from the discharge port 16 toward the laundry in the washing tub 7.

Since the washing liquid sprinkled on the laundry from the discharge port 16 is heated to a predetermined temperature, the enzymes in the detergent are activated and the stains on the fibers of the laundry can be efficiently washed.

When the washing process with warm water is completed, the drain valve (not shown) is opened to drain water. When drainage is complete, dehydration is performed. Dehydration is performed by rotating the washing tub 7 in one direction, and in the present embodiment, rotating the washing tub 7 clockwise at high speed when viewed from above.

After dehydration, the water supply means is operated to supply a predetermined amount of water to the washing tub 7, a rinsing step is performed, a dehydration step is further performed, and each washing step is completed.

In the dehydration step, the washing tub 7 is rotated at high speed in the clockwise direction when viewed from above. Due to the rotation of the washing tub 7, an air flow is generated in the water tub 5 in the direction of arrow A shown in FIG. 7, and the dehydrated washing liquid flows together with the air flow.

Since the first side surface 20a of the mounting portion 20 is inclined toward the rotation direction side of the washing tub 7 as it goes upward, the flow accompanying the rotation of the washing tub 7 is guided along the inclination of the first side surface 20a. Be taken. Since the first side surface 20a is inclined, the flow accompanying the rotation of the washing tub 7 is suppressed, the generation of turbulent flow is suppressed, and the generation of vibration is suppressed.

The second side surface 20b is formed substantially vertically for mounting the heating device 19, but is located on the downstream side of the flow accompanying the rotation of the washing tub 7 with respect to the first side surface 20a, and thus obstructs the flow. No turbulence is generated.

The bottom surface of the water tank 5 is inclined toward the recess 17, and the bottom surface of the recess 17 is inclined toward the drain port 18. In the drainage step, the washing liquid in the water tank 5 flows toward the drainage port 18. Since the heating device 19 is arranged at a position away from the drain port 18, the washing liquid at a position facing the heating device 19 with respect to the rotating shaft 6 in the water tank 5 is drained without going through the heating device 19. It flows out from the mouth 18. Since the amount of the washing liquid passing through the heating device 19 is reduced, the lint contained in the washing liquid is suppressed from adhering to the heating device 19.

When maintenance of the heating device 19 is required, such as when a problem occurs in the heating device 19, the washing machine is rotated to a position where the door body 3 faces, and the door body 3 is removed from the housing 1. Since the heating device 19 is arranged at a position facing the opening 2 from which the door body 3 has been removed, the heating device 19 can be visually recognized by removing the door body 3.

The heating device 19 can be removed from the water tank 5 by removing the wiring from the terminals at both ends of the heating device 19 and removing the fixing screw (not shown). The heating device 19 can be pulled out from the water tank 5 for maintenance. When replacing the heating device 19 with a new heating device 19, the new heating device 19 is inserted into the opening 21 of the mounting portion 20 of the water tank 5, the fixing screw is screwed, and the heating device 19 is replaced with the water tank 5. And attach the wiring to the terminal of the heating device 19. Maintenance is completed by attaching the door body 3 to the housing 1 and returning the washing machine to its original position.

The bottom surface of the water tank 5 is inclined so as to be gradually lowered toward the drain port 18, and the bottom surface of the water tank 5 is formed so as to be the highest on the outer peripheral side including the bottom surface of the recess 17. On the bottom surface of the water tank 5, a reinforcing rib 31 is formed on the back surface side including the back surface of the recess 17. By increasing the outer peripheral side of the back surface of the recess 17, the height of the reinforcing rib 31 located on the back surface of the recess 17 can be increased, and the strength of the recess 17 can be improved.

The heating device 19 is mounted substantially parallel to the bottom surface of the water tank 5, and is arranged so as to be inclined so that the drain port 18 side is lower than the horizontal plane. Since the heating device 19 is arranged substantially parallel to the bottom surface of the water tank 5, the resistance of the drainage flowing toward the drainage port 18 is unlikely to occur, and the lint contained in the drainage can be suppressed from being entangled with the heating device 19. ..

In the present embodiment, the opening 2 is formed on the back surface side of the housing 1, but it may be formed on the side surface of the housing 1 so that the heating device 19 faces the opening 2 on the side surface of the housing 1, and the opening 2 is formed. It may be formed on the front surface of the housing 1 and the heating device 19 may face the opening 2 on the front surface of the housing 1.

By arranging the opening 2 on the side surface or the front surface of the housing 1, the amount of movement of the washing machine during maintenance can be reduced and workability can be improved.

As described above, the washing machine according to the present invention can uniformly heat the washing liquid in the washing tub and reduce unevenness in washing and rinsing performance. Therefore, a washer-dryer, a commercial washing machine, etc. It can also be applied to the above applications.

1 Housing 2 Opening 3 Door 5 Water tank 7 Washing tub 8 Pulsator 9 Motor 17 Recess 19 Heating device 20 Mounting part 20a First side surface 20b Second side surface 21 Opening part 23 Temperature sensor 24 Heat shield plate 25 Heating plate 27 Circulation Pump 28 Circulation path 29 Water inlet 33 Control device

Claims (2)

A housing, a water tub disposed in the housing, a washing tub rotatably arranged in the water tub, a pulsator rotatably arranged at the inner bottom of the washing tub, and the washing tub. A motor for rotationally driving the pulsator, a circulation path for circulating the washing liquid in the washing tub, a circulation pump for forming a flow of the washing liquid in the circulation passage, and a circulation pump arranged in the water tub to supply the washing liquid. It includes a heating device for heating, the motor, the circulation pump, and a control device for controlling the heating device, and has a discharge port located in the middle of the washing tub. The control device is in the washing tub. When the amount of water is less than the predetermined amount, only the pulsator is operated after the heating device is energized, and when the amount of water in the washing tub is larger than the predetermined amount, the circulation is performed at the same time as the energization of the heating device. washing machines characterized by operating the pump. A housing, a water tub disposed in the housing, a washing tub rotatably arranged in the water tub, a pulsator rotatably arranged at the inner bottom of the washing tub, and the washing tub. A motor for rotationally driving the pulsator, a circulation path for circulating the washing liquid in the washing tub, a circulation pump for forming a flow of the washing liquid in the circulation passage, and a circulation pump arranged in the water tub to supply the washing liquid. A heating device for heating, the motor, the circulation pump, and a control device for controlling the heating device are provided, and the control device is the heating device when the amount of clothes in the washing tub is less than a predetermined amount. operates the pulsator after energized, when the amount of clothing of the washing tub is larger than the predetermined amount, the you energization of the heating device and characterized in that operating the circulation pump at the same time washing machines.

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