JP2019187507A - Washing machine - Google Patents

Abstract

To increase temperature of the entire washing liquid efficiently.SOLUTION: A washing machine includes: a housing 1; a water tub 5 disposed in the housing 1; a washing tub 7 rotatably disposed in the water tub 5; a motor 9 for rotationally driving the washing tub 7; a heating device 19 disposed in the water tub 5, and for heating a washing liquid in the water tub 5; and a circulation passage 28 for circulating the washing liquid in the water tub 5 in the washing tub 7 from above. A circulation water port 32 to the circulation passage 28 is formed at the water tub 5 bottom part. The circulation water port 32 rises upward from the water tub 5 bottom surface and opens.SELECTED DRAWING: Figure 9

Description

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

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

  FIG. 15 is a cross-sectional view of a conventional washing machine. In FIG. 15, a water supply port 62 that supplies water to the water tank 63 and a switching valve 66 that branches a water supply path from the water supply port 62 to the water tank 63 into a main water path 64 and a bypass path 65 are provided. A heater 67 is provided.

JP 2006-43100 A

  However, in the conventional configuration, since the heated washing liquid is supplied to the water tank 63, the temperature of the supplied washing liquid decreases, and the temperature of the washing liquid in the entire water tank can be increased efficiently. There was a problem that I could not.

  This invention solves the said conventional subject, and makes it a subject to provide the washing machine which raises the temperature of the whole washing | cleaning liquid efficiently, reduces a washing nonuniformity, and makes it easy to remove dirt.

  In order to solve the conventional problems, a washing machine of the present invention includes a housing, a water tub disposed in the housing, a washing tub rotatably disposed in the water tub, and the washing tub. Drive means for rotationally driving, a heating device disposed in the water tank for heating the washing liquid in the water tank, and a circulation path for circulating the washing liquid in the water tank into the washing tank from above. A circulation water port to the circulation path is formed at the bottom of the water tank.

  Accordingly, it is possible to provide a washing machine that efficiently raises the temperature of the entire washing liquid, reduces washing unevenness, and easily removes dirt.

  The washing machine of the present invention can provide a washing machine that efficiently raises the temperature of the entire washing liquid, reduces washing unevenness, and easily removes dirt.

The perspective view seen from the back side of the state which removed the door of the washing machine in Embodiment 1 of the present invention Cross section of the washing machine Sectional drawing which shows the circulation state of the washing liquid of the washing machine Top view of the water tank of the washing machine viewed from above Enlarged view of the main part of the washing machine The top view which looked at the water tank of the state which removed the heating plate of the washing machine from the upper part OO sectional view of the washing machine in FIG. The main part enlarged plan view of the washing machine Main section enlarged view of the washing machine The perspective view which looked at the water tank of the washing machine from the lower part The perspective view which looked at the water tank of the washing machine from the upper part The principal part enlarged plan view which looked at the water tank of the washing machine from the upper part The principal part enlarged plan view which looked at the water tank in Embodiment 2 of this invention from the upper direction Main section enlarged view of the washing machine Cross section of a conventional washing machine

  1st invention is a housing | casing, the water tank arrange | positioned in the said housing | casing, the washing tub arrange | positioned rotatably in the said water tub, the drive means which rotationally drives the said washing tub, In the said water tub And a heating device that heats the washing liquid in the water tub and a circulation path that circulates the washing liquid in the water tub from above into the washing tub, and a circulation water port to the circulation path is provided in the water tank. It is formed at the bottom.

  As a result, the washing liquid at the bottom of the water tank heated by the heating device can be circulated to the upper part of the water tank, so that the entire washing liquid in the water tank can be efficiently heated, washing unevenness is reduced, and dirt is collected. Can be easily dropped.

  In the second invention, in particular, the circulating water port of the first invention is formed in the vicinity of the heating device.

  Thereby, the washing liquid heated by the heating device can be efficiently guided to the circulation path.

  In the third invention, the circulating water port of the first invention or the second invention is formed so as to protrude upward from the bottom of the water tank toward the heating device.

  As the washing liquid heated by the heating device moves upward, washing liquid having a relatively low temperature flows from the surroundings, but the circulation water port is directed upward from the bottom of the water tank toward the heating device. Since it protrudes and forms, the washing | cleaning liquid warmed with the heating apparatus can be efficiently guide | induced to a circulation path.

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

  FIG. 1 is an exploded perspective view seen from the back of the washing machine according to the embodiment of the present invention, and FIG. 2 is a longitudinal 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 opened and closed. 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 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 maintenance inside the housing 1 is performed. To do. By arranging the door body 3 on the back, the door 3 does not enter the user's field of view when the washing machine is installed, and the aesthetic appearance is not impaired.

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

  An upper case 4 is mounted above the housing 1. A space surrounded by the casing 1 and the upper case 4 supports a bottomed cylindrical water tank 5 formed of a flame-retardant synthetic resin, and a rotating shaft 6 is disposed on the central axis of the water tank 5. Has been. A washing tub 7 connected to the rotating shaft 6 is housed inside the water tub 5, and a pulsator 8 connected to the rotating shaft 6 is disposed at the bottom of the washing tub 7. Below the water tub 5, a motor 9 is disposed, and 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.

  On the upper surface of the water tub 5, a loading port 10 for loading laundry into the washing tub 7 is formed, and the loading port 10 is closed by a lid 11 so as to be freely opened and closed. 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 lid 12 so as to be opened and closed.

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

  In the washing tub 7, a circulation channel cover 15 is provided at a position opposite to the side wall 7 a, and a circulation channel (not shown) is formed between the side surface of the washing tub 7 and the circulation channel cover 15. The washing tub 7 is provided with a pair of circulation channel covers 15 to form two circulation channels opposite to each other. The circulation channel cover 15 and the circulation channel are preferably formed in the same shape in order to suppress the occurrence of imbalance when the washing tub 7 rotates, but the shapes may be varied as necessary.

  In the circulation water channel cover 15, discharge ports 16 are formed at positions corresponding to the upper and middle portions of the washing tub 7. The discharge port 16 may be formed only at one of the positions corresponding to the upper part or the middle part of the washing tub 7.

  The lower part of the pulsator 8 is integrally formed with blades 8a. 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 blades 8a, and circulates in the circulation channel. The washing liquid is discharged and sprinkled from the discharge port 16 into the washing tub 7.

  A concave portion 17 is formed in a substantially arc shape around the rotating shaft 6 at the bottom of the water tank 5, and the bottom of the water tank 5 is formed so as to be gradually lowered toward the concave portion 17. In the recess 17, a drain port 18 is formed on one end side 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 recess 17 at a position on the preceding side in the rotational direction when the washing tub 7 is dehydrated. The rotation direction at the time of dehydration of the washing tub 7 is clockwise when the washing tub 7 is viewed from above, and is the A direction indicated by an arrow in FIG.

  In the concave portion 17 of the water tank 5, a mounting portion 20 to which the heating device 19 is attached is integrally formed to bulge upward from the bottom 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 constituted by a heater.

The attachment portion 20 is formed from the side surface of the water tank 5 to the concave portion 17 and bulges upward from the bottom surface of the concave portion 17. The mounting portion 20 has a top surface that is substantially the same height as the bottom surface of the water tank 5 or a height that is slightly higher than the bottom surface of the water tank 5. The attachment portion 20 has a first side surface 20a that is substantially orthogonal to the rotation direction of the washing tub 7, and a second side surface 20b that is 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 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.

  In the heating device 19, heater wires are formed in a meandering shape, and both end portions are fixed to a mounting plate 22 having an insulating and heat 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 disposed at substantially the center position 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 portion 21 of the second side surface 20 b of the mounting portion 20 by the sealing material.

  The aquarium 5 is attached to the housing 1 such that the opening 21 of the mounting portion 20 is located at a position facing the door body 3. When the door 3 is opened, the opening 21 of the mounting portion 20 faces the opening 2 of the housing 1, and the maintenance of the heating device 19 attached to the opening 21 can be performed.

  A heat shield plate 24 formed of metal, in this embodiment, stainless steel, is disposed below the heating device 19, and the heat shield plate 24 is in a state where a gap is formed between 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 concave portion 17, it is possible to suppress the heat generated by the heating device 19 from being directly transmitted to the concave portion 17, thereby reducing the 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. However, other metal materials may be used, the conduction of heat from the heating device 19 to the water tank 5 can be suppressed, flame retardancy, Alternatively, as long as the material has nonflammability, a material other than metal, for example, ceramic may be used.

  A heating plate 25 made of metal, in this embodiment, stainless steel, is disposed above the heating device 19. 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 configured to be covered with the heating plate 25. Since the heating device 19 is covered with the heating plate 25, heat generated from the heating device 19 can be prevented from being directly transmitted to the washing tub 7, and thermal deterioration at the bottom of the washing tub 7 can be suppressed. it can.

  The heating plate 25 is fixed while being spaced from 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 attachment portion 20. The heating plate 25 is mounted so as to be gradually increased 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.

  In the present embodiment, the heating plate 25 has an inclination angle with respect to the horizontal set to 3 degrees. In the washing machine of the present embodiment, the allowable inclination at the time of installation is set to 2 degrees with respect to the horizontal, and even when the washing machine is installed at an inclination of 2 degrees, the heating plate 25 is in contact with the ground plane. Are set to tilt.

The heating plate 25 is formed in a substantially rectangular shape, and the side 25b on the second side surface 20b side of the mounting portion 20, the side 25c on the outer peripheral side of the concave portion 17, and the side 25d on the central side of the concave portion 17 are respectively second. The side surface 20b, the outer peripheral side surface of the concave portion 17, and the central side surface of the concave portion 17 are attached to or in close proximity to each other. The side 25e of the heating plate 25 on the rotation direction side of the washing tub 7 has a space between the side surface of the recess 17 and the side 25f located between the side surface of the center side of the recess 17 of the heating plate 25 and the second side surface 20b. Is formed in an arc shape, and has a gap between the central side surface of the recess 17 and the second side surface 20b.

  A through hole 25 g is formed in the heating plate 25 at a position above the temperature sensor 23. Since the washing liquid heated by the heating device 19 passes upward from the through hole 25g, 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 do.

  In the vicinity of the heating device 19 in the recess 17, a circulating water port 32 is formed between the heat shield plate 24 and the side wall of the recess 17, and the circulating water port 32 is formed to protrude upward from the bottom surface of the recess 17 toward the heating device 19. Has been. 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 injection port 29 formed in the vicinity of the charging port 10, and washing liquid is supplied from the water injection port 29 to the washing tank 7 by a circulation pump 27. Supply to the laundry inside from above.

  Thereby, since the washing liquid at the bottom of the water tank 5 heated by the heater can be circulated to the upper part of the water tank 5, the entire washing liquid in the water tank 5 can be efficiently heated, and washing unevenness is reduced. Can easily remove dirt.

  As the washing liquid heated by the heating device 19 moves upward, the washing liquid having a relatively low temperature flows from the surroundings, but the circulation water port 32 is formed upward from the bottom surface of the recess 17. Since it protrudes toward 19, the washing liquid warmed by the heating device 19 can be efficiently guided to the circulation path 28.

  The water injection port 29 is disposed above the discharge port 16 of the circulating water channel. The circulation amount of the washing liquid by the circulation pump 27 is set larger than the circulation amount of the washing liquid in the circulation channel. As a result, the amount of the washing liquid supplied from the water injection port 29 is large and is supplied from a high position. The supplied washing liquid foams against the laundry or the washing liquid in the washing tub 7 and causes the laundry to flow. Wrapping with a large amount of foam acts on dirt and improves the cleaning performance.

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

  In the present embodiment, the operation course executed by the control device 33 is provided with a course in which washing is performed by heating the washing liquid and a course in which washing is performed while the washing liquid is not heated.

  The operation and action of the washing machine configured as described 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 insertion port 10, the outer lid 12 and the lid body 11 are closed, and a power switch (not shown) of the operation display device 30 is operated. 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 the thrown-in laundry, the water supply means (not shown) is actuated to start water supply, and the water tank 5 together with the detergent put into the detergent case (not shown). The washing liquid is supplied inside.

When a predetermined amount of the washing liquid is stored in the water tank 5, the circulation pump 27 is activated 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. The foam penetrates deep into the laundry fibers, wraps the dirt, floats the dirt, and is washed away.

  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 a water level sensor (not shown), the water supply is stopped and the motor 9 is driven. The pulsator 8 is rotated forward and reverse alternately. The laundry in the washing tub 7 is stirred together with the washing liquid by the rotation of the pulsator 8 to wash the laundry.

  Even in the washing process, the operation of the circulation pump 27 is continued. The foamed washing liquid is circulated so that the foam acts on the dirt, and the dirt can be efficiently removed.

  The washing process is continued for a predetermined time, and when washing is completed, a drain valve (not shown) is opened and drained. When drainage is completed, dehydration is performed. Dehydration is performed by rotating the washing tub 7 in one direction, in the present embodiment, by rotating the washing tub 7 in the clockwise direction 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, a rinsing step is performed, a dehydration step is further performed, and each washing step is completed.

  When a course for washing by washing the washing liquid is selected as the operation course, a heating process for heating the washing liquid is performed in the washing process. When the operation is started, the amount of laundry loaded is detected, and water is supplied into the aquarium 5 according to the amount of laundry loaded. The heating device 19 is energized together with the water supply, and the washing liquid in the water tub 5 is heated.

  The washing liquid heated by the heating device 19 moves upward. The heating plate 25 located above the heating device 19 is disposed so as to be gradually higher toward the through hole 25a side, so that the heated washing liquid passes through the heating plate 25 through the through hole. It is guided to 25a and moves upward of the heating plate 25 from the through hole 25a.

  Since the washing liquid below the heating plate 25 moves above the heating plate 25, the low-temperature washing liquid flows from the periphery of the heating plate 25 to the lower side of the heating plate 25. The heating plate 25 has an interval between a side 25e on the rotation direction side of the washing tub 7 and a side 25f located between the central side surface of the concave portion 17 and the second side surface 20b. Therefore, the washing liquid flows into the lower part of the heating plate 25 from the substantially opposite two sides of the heating plate 25. Since the washing liquid flows into the lower part of the heating plate 25 from the substantially opposite two sides of the heating plate 25, the washing liquid efficiently convects and the washing liquid can be efficiently heated.

  Since the heating device 19 also heats the heating plate 25, the washing liquid is also heated by the heating plate 25, and the heating efficiency of the washing liquid is improved.

  Since the through hole 25a is formed on 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 shifted laterally from the upper position of the heating device 19. Since the upper portion of the heating device 19 is covered by the heating plate 25, foreign matter contacts the heating device 19 by the heating plate 25. It is possible to suppress this.

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

  When the washing liquid reaches a certain temperature 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 warmed washing liquid is circulated, the powder detergent can be dissolved efficiently, 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, the laundry hits the laundry and foams, the foam penetrates into the laundry, and the dirt adhering to the back of the fiber is washed away. Since the washing liquid is warmed, the enzyme of the detergent is activated and the cleaning power can be improved.

  When the washing liquid reaches a predetermined temperature, the pulsator 8 is rotated forward and backward alternately. The laundry in the washing tub 7 is stirred together with the washing water by the rotation of the pulsator 8 to wash the laundry. Since the washing liquid is heated and stirred, the undissolved residue of the powder detergent can be suppressed. 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 to the outer peripheral side due to the centrifugal force generated by the rotation of the blades 8a, rises in the circulation channel, and is sprinkled from the discharge port 16 toward the laundry in the washing tub 7.

  Since the washing liquid sprayed from the discharge port 16 to the laundry is heated to a predetermined temperature, the stain in the laundry fibers can be efficiently washed by activating the enzyme in the detergent.

  When the washing process with warm water is completed, a drain valve (not shown) is opened and drained. When drainage is completed, dehydration is performed. Dehydration is performed by rotating the washing tub 7 in one direction, in the present embodiment, by rotating the washing tub 7 in the clockwise direction 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, 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 a high speed in the clockwise direction when viewed from above. The rotation of the washing tub 7 generates an air flow in the direction of arrow A shown in FIG. 11 in the water tub 5, and the dehydrated washing liquid flows along with the air flow.

  Since the first side surface 20a of the mounting portion 20 is inclined upward toward the rotation direction of the washing tub 7, the flow accompanying the rotation of the washing tub 7 is guided along the inclination of the first side surface 20a. It is burned. Since the 1st side 20a inclines, it is suppressed that the flow accompanying rotation of the washing tub 7 is interrupted | blocked, generation | occurrence | production of a turbulent flow is suppressed, and generation | occurrence | production of a vibration is suppressed.

  The second side surface 20b is formed substantially vertically for mounting the heating device 19. However, the second side surface 20b is located on the downstream side of the flow associated with the rotation of the washing tub 7 as compared with the first side surface 20a, and therefore hinders the flow. And no turbulence is generated.

  The upper part of the heating device 19 is covered with a heating plate 25, and the heating plate 25 is disposed at substantially the same height as the bottom surface of the water tank 5 and the top surface of the mounting portion 20. The generation of turbulent flow can be suppressed without hindering.

  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 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 separated 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 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 necessary, such as when a failure 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 disposed at a position facing the opening 2 from which the door body 3 is removed, the heating device 19 can be visually recognized by removing the door body 3.

  It becomes possible to remove the heating device 19 from the water tank 5 by removing the wiring from the terminals at both ends of the heating device 19 and removing a fixing screw (not shown). The heating device 19 can be pulled out of the water tank 5 to perform maintenance. When the heating device 19 is replaced 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 a fixing screw is screwed into the heating device 19. The wiring is attached to the terminal of the heating device 19. 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 gradually become lower toward the drain port 18, and the bottom surface of the water tank 5 is formed so that the outer peripheral side including the bottom surface of the recess 17 is the highest. Reinforcing ribs 31 are formed on the bottom surface of the water tank 5 including the back surface of the recess 17 on the back surface side. By increasing the outer peripheral side of the back surface of the recess 17, the height of the reinforcing rib 31 positioned 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 disposed so as to be inclined so that the drain outlet 18 side is lower than the horizontal plane. Since the heating device 19 is disposed substantially parallel to the bottom surface of the water tank 5, resistance to drainage flowing toward the drain port 18 is unlikely to occur, and lint contained in the drainage can be prevented from being entangled with the heating device 19. .

  In the present embodiment, the opening 2 is formed on the back side of the housing 1. However, the opening 2 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. 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 disposing 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.

(Embodiment 2)
FIG. 13 is an enlarged plan view of the main part of the washing tub of the washing machine according to the second embodiment of the present invention as viewed from above, and FIG. 14 is a cross-sectional view of the main part.

  The second embodiment is the same as the first embodiment except that a heating plate 35 having a different shape from the heating plate 25 of the first embodiment is used and the position of the drain port 18 is different. The same parts as those in FIG.

  A heating plate 35 made of metal, in this embodiment, stainless steel, is disposed above the heating device 19, and the heating device 19 is configured to be covered with the heating plate 35. Since the heating device 19 is covered with the heating plate 35, heat generated from the heating device 19 can be prevented from being directly transferred to the washing tub 7, and thermal deterioration at the bottom of the washing tub 7 can be suppressed. it can.

  The heating plate 35 is formed in a substantially rectangular shape, and the side 35b on the second side surface 20b side of the mounting portion 20, the side 35c on the outer peripheral side of the concave portion 17, and the side 35d on the central side of the concave portion 17 are respectively second. The side surface 20b, the outer peripheral side surface of the concave portion 17, and the central side surface of the concave portion 17 are attached to or in close proximity to each other. Arc-shaped notches 35h are formed on the sides 35c and 35d of the heating plate 35 so that the washing liquid convects. The side 35e of the heating plate 35 on the rotation direction side of the washing tub 7 is spaced from the side surface of the recess 17.

The heating plate 25 is mounted so as to be gradually inclined toward the side 35e, and the washing liquid heated by the heating device 19 is efficiently guided to the side 35e by the inclination of the heating plate 35.

  In the present embodiment, the heating plate 35 has an inclination angle with respect to the horizontal of 3 degrees. In the washing machine of the present embodiment, the allowable inclination at the time of installation is set to 2 degrees with respect to the horizontal, and even when the washing machine is installed at an inclination of 2 degrees, the heating plate 35 is in contact with the ground plane. Are set to tilt.

  A through hole 35 g is formed in the heating plate 35 at a position above the temperature sensor 23. Since the washing liquid heated by the heating device 19 passes upward through the through hole 35g, 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 do.

  When a course for washing by washing the washing liquid is selected as the operation course, the heating device 19 is energized together with the water supply to heat the washing liquid in the water tank 5.

  The washing liquid heated by the heating device 19 moves upward. Since the heating plate 35 located above the heating device 19 is disposed so as to be gradually higher toward the side 35e, the heated washing liquid is applied to the side 35e along the heating plate 25. It guide | induces and moves to the upper direction of the heating plate 35 from the side 35e side.

  Since the washing liquid below the heating plate 35 moves above the heating plate 35, the low-temperature washing liquid flows from the periphery of the heating plate 35 to the lower side of the heating plate 35. Since the heating plate 35 has notches 35h formed on the sides 35c and 35d, the washing liquid flows into the lower side of the heating plate 35 from two substantially opposite sides of the heating plate 35. Since the washing liquid flows into the lower part of the heating plate 35 from the substantially opposite two sides of the heating plate 35, the washing liquid efficiently convects and the washing liquid can be efficiently heated. Since the heating device 19 also heats the heating plate 35, the washing liquid is also heated by the heating plate 35, and the heating efficiency of the washing liquid is improved.

  Since the heating plate 35 is inclined, the heated washing liquid can be efficiently guided upward. Since the upper portion of the heating device 19 is covered with the heating plate 35, it is possible to prevent foreign matter from coming into contact with the heating device 19 by the heating plate 35.

  Since the drainage port 18 is disposed at a position away from the side 35e of the heating plate 35 when the water tank 5 is viewed from above, the drainage is led to the drainage port 18 by the heating plate 35, and the lint contained in the drainage is removed. It is possible to suppress entanglement with the heating device 19.

  As described above, the washing machine according to the present invention can efficiently raise the temperature of the entire washing liquid, reduce washing unevenness, and easily remove dirt, so that it can be used for washing and drying machines, commercial washing machines, etc. It can also be applied to.

DESCRIPTION OF SYMBOLS 1 Case 5 Water tub 7 Washing tub 9 Motor 17 Recessed part 19 Heating device 20 Mounting part 21 Opening part 23 Temperature sensor 24 Heat shield plate 25 Heating plate 28 Circulation path 29 Water inlet 32 Circulating water port 35 Heating plate

Claims (3)

A housing, a water tub disposed in the housing, a washing tub rotatably disposed in the water tub, driving means for rotationally driving the laundry tub, disposed in the water tub, A washing machine comprising: a heating device for heating the washing liquid in the water tank; and a circulation path for circulating the washing liquid in the water tank from above into the washing tank, and a circulation water port to the circulation path is formed at the bottom of the water tank. . 2. The washing machine according to claim 1, wherein the circulating water port is formed in the vicinity of the heating device. The washing machine according to claim 1 or 2, wherein the circulating water port is formed to protrude upward from the bottom surface of the water tank toward the heating device.

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