JP7117508B2 - washing machine - Google Patents

Description

The present invention relates to a washing machine for washing clothes and the like.

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

FIG. 13 is a sectional view of a conventional washing machine. In FIG. 13, a water supply port 62 for supplying water to a water tank 63 and a switching valve 66 for branching a water supply route from the water supply port 62 to the water tank 63 into a main water channel 64 and a bypass route 65 are provided. A heater 67 is provided.

However, in this configuration, there is a problem that the channel for supplying the heated washing liquid to the water tub 63 becomes complicated.

Therefore, in order to solve this problem, as shown in FIG.

FIG. 16 is a perspective view of a conventional water tank. A recess 73 is formed in the bottom of the water tank 71 , and a heater 72 is arranged so as to be positioned in the recess 73 . A fixing portion 74 for fixing the heater 72 is formed on the outer peripheral side of the bottom of the water tank 71 .

JP 2007-167385 A

However, in the above-described conventional configuration, since the drain port is provided near the heater, the waste water from the drain port flows near the heater, and there is a risk that the lint contained in the waste water may get caught on the heater. If the lint is caught on the heater, it is necessary to remove the lint from the heater, resulting in poor usability.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-described conventional problems, and to provide a washing machine capable of reducing the maintenance of the heating device.

In order to solve the above conventional problems, the washing machine of the present invention includes a housing, a water tank arranged in the housing, and a water tank rotatably arranged in the water tank about a substantially vertical rotating shaft. A washing tub, a drive means for rotationally driving the washing tub, a drain port for draining the washing liquid in the water tub, and a heating means for heating the washing liquid, and at the bottom of the water tub, the water tub is provided. A recess formed in a generally arcuate shape centering on the rotation shaft so as to be lower than the bottom surface and a mounting portion protruding upward from the bottom surface of the recess are formed, and the drain port is formed in the recess. In the washing machine, the heating means is mounted on the mounting portion so as to extend to the other end side of the concave portion, and is disposed at the leading end portion in the rotation direction of the washing tub during dehydration.

Accordingly, it is possible to provide a washing machine that can reduce the maintenance of the heating device.

The washing machine of the present invention can provide a washing machine that can reduce the maintenance of the heating device.

FIG. 2 is a perspective view of the washing machine according to Embodiment 1 of the present invention, viewed from the rear side with the door removed. Same sectional view Sectional drawing which shows the circulation state of the same washing liquid A plan view of the tank seen from above Enlarged view of the main part Top view of the water tank with the heating plate removed OO sectional view of FIG. Enlarged plan view of the main part Enlarged cross-sectional view of the main part Perspective view of the water tank seen from below Perspective view of the water tank seen from above Enlarged plan view of the main part of the water tank viewed from above Sectional view of a conventional washing machine Perspective view of conventional washing machine tub

A first invention comprises a housing, a water tank disposed within the housing, a washing tub disposed within the water tank so as to be rotatable about a substantially vertical rotating shaft, and the washing tub being rotationally driven. A driving means, a drain port for draining the washing liquid in the water tank, and a heating means for heating the washing liquid are provided. and a mounting portion that bulges upward from the bottom surface of the recess. and the heating means is attached to the mounting portion so as to extend to the other end side of the recess.

As a result, the washing liquid at a position spaced apart from the heating device flows out of the drain port without passing through the heating device. Since the amount of washing liquid passing through the heating device is reduced, lint contained in the washing liquid is prevented from adhering to the heating device.

In the second invention, in particular, a heat shield plate is arranged between the bottom surface of the water tank and the heating device of the first invention to block the transmission of the heat generated by the heating device to the bottom surface of the water tank. .

As a result, it is possible to suppress direct transmission of the heat generated by the heating device to the bottom surface of the water tank, thereby suppressing thermal deterioration of the bottom part of the water tank.

In a third invention, in particular, a heating plate is arranged between the bottom surface of the washing tub and the heating device of the first or second invention to cover the upper side of the heating device.

In addition, since the upper part of the heating device is covered with the heating plate, the flow of the washing liquid in the water tub is not hindered, and turbulent flow can be suppressed.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that the present invention is not limited by this embodiment.

FIG. 1 is an exploded perspective view of a washing machine according to an embodiment of the present invention, viewed from the rear, and FIG. 2 is a longitudinal sectional view of the same washing machine.

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

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

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

An upper case 4 is mounted above the housing 1 . A bottomed cylindrical water tank 5 made of a 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. It is A washing tub 7 connected to a rotating shaft 6 is provided inside the water tank 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 rotating 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 tub 5, and the loading port 10 is closed by a lid 11 so as to be openable and closable. The upper case 4 is formed with an outer loading port (not shown) for loading laundry into the washing tub 7, and the outer loading port is closed by an outer cover 12 so as to be openable and closable.

The washing tub 7 comprises a cylindrical side wall 7a made of corrosion-resistant metal, in this embodiment stainless steel, and a bottom wall 7b made of flame-retardant synthetic resin. It is integrally fixed and configured. The washing tub 7 has 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 part.

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

Discharge ports 16 are formed in the circulation channel cover 15 at positions corresponding to the upper and middle portions of the washing tub 7 . The discharge port 16 may be formed only at a position corresponding to either the upper portion or the middle portion of the washing tub 7 .

Blades 8a are formed integrally with the lower part of the pulsator 8. When the motor 9 rotates the pulsator 8, the centrifugal force of the blades 8a pushes the washing water outward, circulates in the water circulation channel, and circulates in the water circulation channel. The washing liquid is discharged and sprinkled into the washing tub 7 from the discharge port 16. - 特許庁

A substantially arcuate recess 17 is formed in the bottom of the water tub 5 with the rotary shaft 6 as the center. A drain port 18 is formed at one end of the recess 17 , and the bottom surface of the recess 17 is formed so as to be gradually lowered toward the drain port 18 . The drain port 18 is formed in the concave portion 17 at a position on the leading side in the rotation direction of the washing tub 7 during dehydration. The direction of rotation of the washing tub 7 during dehydration is the clockwise direction when the washing tub 7 is viewed from above, which is the direction of arrow A in FIG. 11 .

A mounting portion 20 to which the heating device 19 is attached is integrally formed in the concave portion 17 of the water tank 5 so as to bulge upward from the bottom portion of the concave portion 17 of the water tank 5 . The heating device 19 is for heating the washing water supplied into the water tank 5, and is constructed by a heater.

The mounting portion 20 is formed from the side surface of the water tub 5 to the recess 17 and is formed to bulge upward from the bottom surface of the recess 17 . The mounting portion 20 is formed so that the top surface thereof is approximately the same height as the bottom surface of the water tank 5 or slightly higher than the bottom surface of the water tank 5 . 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 incline toward the rotation direction side of the washing tub 7 as it goes upward from the bottom surface side. The second side surface 20b is formed in a substantially vertical planar shape, and an opening 21 into which the heating device 19 is inserted from the outside of the water tank 5 is formed in the second side surface 20b.

The heating device 19 has a heater wire formed in a meandering shape, and both ends of the wire are fixed to a mounting plate 22 having insulating and heat-insulating functions. A temperature sensor 23 composed of a thermistor is attached to 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 substantially in the center of both end portions 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 periphery of the opening 21 of the second side surface 20b of the mounting portion 20 with the sealing material.

The water tank 5 is attached to the housing 1 so that the opening 21 of the attachment portion 20 is positioned opposite the door 3 . When the door 3 is opened, the opening 21 of the mounting portion 20 faces the opening 2 of the housing 1, and maintenance of the heating device 19 attached to the opening 21 can be performed.

A heat shield plate 24 made of metal, stainless steel in this embodiment, is disposed below the heating device 19, and the heat shield plate 24 is spaced from the bottom surface of the recess 17. 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 direct transmission of the heat generated by the heating device 19 to the recess 17, thereby preventing thermal deterioration of the bottom of the water tank 5. can be suppressed.

In the present embodiment, the heat shield plate 24 is made of stainless steel in order to have corrosion resistance. Alternatively, materials other than metals, such as ceramics, may be used as long as they are nonflammable materials.

Above the heating device 19, a heating plate 25 made of metal, stainless steel in this embodiment, is arranged. A through hole 25 a is formed in the heating plate 25 on the center side of the water tank 5 . The through hole 25 a is formed at a position shifted from the upper position of the heating device 19 , and the heating device 19 is covered with the heating plate 25 . Since the heating device 19 is covered with the heating plate 25, it is possible to suppress direct transmission of the heat generated from the heating device 19 to the washing tub 7, thereby suppressing thermal deterioration of the bottom of the washing tub 7. can.

The heating plate 25 is fixed with a space between it and the heating device 19 by a plurality of ribs 26 erected upward from the bottom surface of the recess 17 . The heating plate 25 is mounted at substantially the same height as the bottom surface of the water tank 5 and the top surface of the mounting portion 20 . The heating plate 25 is inclined so as to gradually rise toward the through hole 25a, and the washing liquid heated by the heating device 19 is efficiently guided to the through hole 25a by the inclination of the heating plate 25. As shown in FIG.

In this embodiment, the heating plate 25 is set at an angle of inclination of 3 degrees with respect to the horizontal. In the washing machine of this embodiment, the allowable inclination at the time of installation is set to 2 degrees with respect to the horizontal. It is set to tilt

The heating plate 25 is formed in a substantially rectangular shape, and a side 25b on the side of the second side surface 20b of the mounting portion 20, a side 25c on the outer peripheral side of the recess 17, and a side 25d on the center side of the recess 17 are each formed into a second shape. side surface 20 b of the recess 17 , the outer peripheral side surface of the recess 17 , and the central side surface of the recess 17 . A side 25e of the heating plate 25 on the rotating direction side of the washing tub 7 has a gap with the side surface of the recess 17, and a side 25f located between the side surface of the heating plate 25 on the center side of the recess 17 and the second side surface 20b. is formed in an arc shape, and has a space between the side surface on the center side of the recess 17 and the second side surface 20b.

A through hole 25 g is formed in the heating plate 25 above the temperature sensor 23 . Since the washing liquid heated by the heating device 19 passes upward through the through hole 25g, the heated washing liquid does not stay around the temperature sensor 23, and the temperature sensor 23 can accurately detect the temperature of the washing liquid. can be done.

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

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

An operation display device 30 is provided at the rear portion of the upper surface of the upper case 4. By operating the operation display device 30, various driving courses are set and the set driving courses and the like are displayed. A control device 33 is arranged at a position facing the opening 2 of the housing 1, and the driving course selected by the control device 33 on the operation display device 30 is executed.

In the present embodiment, the operation courses executed by the control device 33 include a course of washing with the washing liquid heated and a course of washing with the washing liquid not heated.

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

The outer lid 12 and the lid body 11 are opened, the laundry is put into the washing tub 7 from the inlet 10, the outer lid 12 and the lid body 11 are closed, and the power switch (not shown) of the operation display device 30 is operated. to turn on the power. A driving course or the like is selected by the operation display device 30, and a start switch (not shown) is operated to start driving.

When the operation is started, after detecting the amount of laundry put in, the water supply means (not shown) is operated to start supplying water, and the detergent put in the detergent case (not shown) and the water tub 5 Washing liquid is supplied inside.

When a predetermined amount of washing liquid is stored in the water tank 5, the circulation pump 27 is activated and the washing liquid is injected from the water inlet 29 (see FIG. 3). Since the washing liquid from the water inlet 29 is supplied from a high position, it hits the laundry in the washing tub 7 and foams up, the foam penetrates deep into the fibers of the laundry, envelops the dirt, lifts the dirt, and washes 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. When a water level sensor (not shown) detects a predetermined water level, the water supply is stopped and the motor 9 is driven. to alternately rotate the pulsator 8 forward and backward. The laundry in the washing tub 7 is stirred together with the washing liquid by the rotation of the pulsator 8, and the laundry is washed.

The operation of the circulation pump 27 is continued even in the washing process. By circulating the foamed washing liquid, the foam acts on the dirt, and the dirt can be removed efficiently.

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

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

When the course of washing by heating the washing liquid is selected as the operation course, the heating process of heating the washing liquid is performed in the washing process. When the operation is started, the amount of laundry put in is detected, and water is supplied to the water tub 5 according to the amount of the laundry put in. The heating device 19 is energized along with the water supply to heat the washing liquid in the water tub 5 .

The washing liquid heated by the heating device 19 moves upward. Since the heating plate 25 located above the heating device 19 is disposed so as to be inclined so as to gradually rise toward the through hole 25a side, the heated washing liquid flows along the heating plate 25 to the through hole. 25a and moves above the heating plate 25 from the through hole 25a.

Since the washing liquid below the heating plate 25 moves to the upper side of the heating plate 25 , the low-temperature washing liquid flows from the surroundings of the heating plate 25 to the lower side of the heating plate 25 . The heating plate 25 has a side 25e on the rotation direction side of the washing tub 7 and a side 25f located between the side surface on the center side of the recess 17 and the second side surface 20b, and has a gap between the side surface of the recess 17. Therefore, the washing liquid flows below the heating plate 25 from two sides of the heating plate 25 that are substantially opposed to each other. Since the washing liquid flows below the heating plate 25 from two sides substantially facing each other of the heating plate 25, the washing liquid can efficiently convect and heat the washing liquid efficiently. Since the heating device 19 also heats the heating plate 25, the washing liquid is also heated by the heating plate 25, thereby improving the heating efficiency of the washing liquid.

Since the through hole 25a is formed in the inclined upper side of the heating plate 25, the heated washing liquid can be efficiently guided upward. The through hole 25a is formed at a position laterally displaced from the upper position of the heating device 19, and the upper side of the heating device 19 is covered with the heating plate 25. It becomes possible to suppress doing.

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

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 through the water inlet 29 . Since the warmed washing liquid is circulated, it is possible to efficiently dissolve the powder detergent, suppress undissolved powder detergent, and improve washing efficiency.

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 dirt adhering to the depths of the fibers. Since the washing liquid is warmed, the enzymes in the detergent are activated and the detergency can be improved.

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

When the pulsator 8 rotates, the centrifugal force generated by the rotation of the blades 8a pushes the washing liquid toward the outer circumference, ascends the circulating water channel, and sprays the laundry in the washing tub 7 from the discharge port 16. - 特許庁

Since the washing liquid sprayed on the laundry from the discharge port 16 is heated to a predetermined temperature, enzymes in the detergent are activated to efficiently wash the dirt stuck to the fibers of the laundry.

After the washing process with warm water is completed, a drain valve (not shown) is opened to drain the water. After the water is drained, the water is dehydrated. The dehydration is performed by rotating the washing tub 7 in one direction at a high speed, in the present embodiment, rotating the washing tub 7 clockwise when viewed from above.

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

In the dewatering process, the washing tub 7 is rotated clockwise as viewed from above at high speed. Due to the rotation of the washing tub 7, an air current is generated in the water tub 5 in the direction of the arrow A shown in FIG. 11, and the dehydrated washing liquid flows together with the air current.

Since the first side surface 20a of the mounting portion 20 is inclined in the direction of rotation of the washing tub 7 as it goes upward, the flow associated with the rotation of the washing tub 7 is guided along the inclination of the first side surface 20a. be killed. Since the first side surface 20a is slanted, it is suppressed that the flow associated with the rotation of the washing tub 7 is blocked, the generation of turbulence is suppressed, and the generation of vibration is suppressed.

The second side surface 20b is formed substantially vertically in order to mount the heating device 19, but since it is located downstream of the flow accompanying the rotation of the washing tub 7 than the first side surface 20a, it obstructs the flow. and does not cause turbulence.

The upper part of the heating device 19 is covered with a heating plate 25, and the heating plate 25 is arranged at substantially the same height as the bottom surface of the water tank 5 and the top surface of the mounting part 20, so that the washing liquid flowing in the water tank 5 is prevented from flowing. It is possible to suppress the occurrence of turbulence without disturbing the flow.

The bottom surface of the water tank 5 is slanted toward the recess 17 , and the bottom surface of the recess 17 is slanted toward the drain port 18 . In the draining process, the washing liquid in the water tank 5 flows toward the drain port 18 . Since the heating device 19 is disposed at a position spaced apart 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 passing through the heating device 19. It flows out of the mouth 18. Since the amount of washing liquid passing through the heating device 19 is reduced, lint contained in the washing liquid is prevented from adhering to the heating device 19 .

When maintenance of the heating device 19 is required, such as when the heating device 19 malfunctions, the washing machine is rotated to a position where the door 3 faces, and the door 3 is removed from the housing 1.例文帳に追加Since the heating device 19 is arranged at a position facing the opening 2 from which the door 3 is removed, the heating device 19 can be visually recognized by removing the door 3 .

The heating device 19 can be removed from the water tank 5 by removing the wires from the terminals at both ends of the heating device 19 and removing the fixing screws (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, and the fixing screw is screwed to attach the heating device 19 to the water tank 5. and attach wiring to the terminals of the heating device 19 . The maintenance is completed by attaching the door 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 become gradually lower toward the drain port 18, and the bottom surface of the water tank 5, including the bottom surface of the recess 17, is formed so that the outer peripheral side is highest. A reinforcing rib 31 is formed on the bottom surface of the water tank 5 including the back surface of the concave portion 17 on the back surface side. By raising 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 at an angle 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, it is difficult to resist the drainage flowing toward the drainage port 18, and the lint contained in the drainage can be suppressed from entangling the heating device 19. .

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

INDUSTRIAL APPLICABILITY As described above, the washing machine according to the present invention can suppress the occurrence of vibration during dehydration operation, and therefore can be applied to applications such as washing/drying machines and commercial washing machines.

1 housing 2 opening 3 door 5 water tub 7 washing tub 8 pulsator 9 motor 17 recess 19 heating device 20 mounting portion 20a first side 20b second side 21 opening 23 temperature sensor 24 heat shield 25 heating plate 25a penetration hole 27 circulation pump 28 circulation path 29 water inlet 35 heating plate

Claims (4)

a housing, a water tank disposed within the housing, a washing tank disposed rotatably about a substantially vertical rotating shaft in the water tank, driving means for rotationally driving the washing tank, and the water tank and a heating means for heating the washing liquid. A concave portion is formed, and a mounting portion is formed so as to bulge upward from the bottom surface of the concave portion. , wherein the heating means is attached to the mounting portion so as to extend to the other end side of the recess. 2. The washing machine according to claim 1, further comprising a heat shield plate disposed between the bottom surface of said water tank and said heating means for blocking transmission of heat generated by said heating means to said bottom surface of said water tank. 3. The washing machine according to claim 1, further comprising a heating plate disposed between the bottom surface of the washing tub and the heating means to cover the upper side of the heating means. 4. The heating device according to any one of claims 1 to 3, wherein the heating means is attached to the mounting portion so as to extend to an end portion of the concave portion on the side lagging behind in the direction of rotation of the washing tub during dehydration. or the washing machine according to item 1.

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