CN104975472B - Washing machine - Google Patents

Abstract

The present invention provides a washing machine capable of preventing damage and discoloration of cloth. The washing machine comprises: a drum (2), which accommodates laundry; an outer cylinder (3), which accommodates the drum (2) in a freely rotatable manner; a water supply solenoid valve (4), which supplies water to the outer cylinder (3); and a heating A unit (5) which heats the wash water supplied into the drum (2), the heating unit (5) comprising: a pipe part in which the wash water flows; and a heating element which switches the wash water flowing in the pipe part into heat Arbitrary states in water and steam.

Description

washing machine

technical field

The invention relates to a washing machine with a heating device for generating steam.

Background technique

As for the washing machine, a washing machine having a heating device for decomposing oil stains and the like by exposing clothes to steam before a washing process has been proposed (for example, refer to Patent Document 1).

prior art literature

Patent Document 1

Patent Document 1: Japanese Unexamined Patent Publication No. 2003-93775

Contents of the invention

The problem to be solved by the invention

However, in the washing machine described in Patent Document 1, the steam outlet is provided close to the washing tub (inner tub). Therefore, for example, when the amount of clothes is large, if steam is ejected from the outlet, damage or discoloration of the cloth may occur. question.

The present invention was made to solve the above conventional problems, and an object of the present invention is to provide a washing machine capable of preventing damage and discoloration of cloth.

Technical solutions for solving problems

The present invention provides a washing machine, which includes: an inner cylinder for storing laundry; an outer cylinder for freely rotating the inner cylinder; and a water supply valve for supplying water to the outer cylinder. The washing machine is characterized in that it has a heating device. , to heat the washing water supplied into the inner cylinder, the heating device includes: a pipe part through which the washing water flows; and a heating part switched by heating the washing water flowing in the pipe part Produces hot water and steam.

Invention effect

According to the present invention, it is possible to provide a washing machine capable of preventing damage and discoloration of cloth.

Description of drawings

Fig. 1 is an external perspective view showing a washing machine according to an embodiment of the present invention.

Fig. 2 is a side view schematically showing the internal structure of the washing machine according to the embodiment of the present invention.

Fig. 3 is a perspective view showing a circulation flow path provided in the outer cylinder cover.

Fig. 4 is a front view showing the internal structure of the washing machine according to the embodiment of the present invention.

Fig. 5 is a schematic diagram showing a water supply path of a water supply solenoid valve.

Fig. 6 is a perspective view showing the appearance of a heating unit.

Fig. 7 is a front view showing a heating unit.

Fig. 8 is a sectional view taken along line II in Fig. 7 .

Fig. 9 is a sectional view taken along line II-II in Fig. 8 .

Fig. 10 is a schematic configuration diagram of a heating element of a heating unit.

Fig. 11 is a sectional view taken along line III-III in Fig. 4 .

Fig. 12 is a side cross-sectional view schematically showing a spraying state from a nozzle.

Fig. 13 is a block diagram showing a washing machine.

Fig. 14 is a process diagram illustrating the operation steps of the washing operation of the washing machine (with cycle washing/with drum rotation).

Fig. 15 is a process diagram illustrating the operation steps of the washing operation of the washing machine (without cycle washing/drum rotation).

Fig. 16 is a process diagram illustrating the operation steps of the washing operation of the washing machine (no cycle washing/no drum rotation).

Symbol Description

1 chassis

2 drum (inner cylinder)

3 outer cylinder

4 Water supply solenoid valve (water supply valve)

4a Water supply hose connection port

4b Detergent water supply solenoid valve

4c Finishing agent water supply solenoid valve

4d Outer cylinder water supply solenoid valve

4e Cooling water supply solenoid valve

4f switching valve

5 heating unit (heating device)

3d outer cylinder cover

11 drum motor

23 Filter housing

24 circulation pump

27 Circulation flow path

51 Heater housing

52, 53 heat-resistant casing

54 aluminum shell

54a Tube

55 Heating element (heating part)

56 insulation

57, 58 Heat-resistant hose (tube with elasticity)

100 Tumble-type washing and drying machines (washing machines)

detailed description

Next, a washing machine (drum-type washing and drying machine) according to an embodiment of the present invention will be described in detail with appropriate reference to the drawings. In addition, in this embodiment, washing machine 100 having a circulation pump for circulating washing water is described as an example, but it can also be applied to a washing machine without a circulation pump. In addition, in this embodiment, a drum-type washing and drying machine is used as an example for description, but it can also be applied to a vertical washing and drying machine, and can also be applied to a vertical washing machine without a drying function (so-called fully automatic washing machine). ).

First, the overall structure of the washing machine 100 (drum-type washing and drying machine) will be described mainly with reference to FIGS. 1 and 2 . FIG. 1 is an external perspective view showing a washing machine according to an embodiment of the present invention, and FIG. 2 is a side view schematically showing an internal structure of the washing machine according to an embodiment of the present invention. The front, back, up, down, left, and right directions in the following description are based on the front, back, up, down, left, and right directions shown in FIG. 1 .

As shown in FIG. 1 , a washing machine 100 includes a casing 1 constituting an outer contour, and the casing 1 has a drum 2 (inner cylinder), an outer cylinder 3, a water supply solenoid valve 4 (water supply valve), a heating unit 5 (heating device) and the like.

The housing 1 is mounted on a base 1h, and is composed of left and right side panels 1a, 1b, a front cover 1c, a rear cover 1d (see FIG. 2), an upper cover 1e, and a lower front cover 1f. The left and right side panels 1a, 1b are combined by a U-shaped upper reinforcement 36 (see FIG. 4), a front reinforcement 37 (see FIG. 2), and a rear reinforcement (not shown), and a base 1h is added to form a box-shaped Chassis 1. The upper cover 1e is provided with the water supply hose connection port 4a of the water supply hose connected to the faucet, and the water suction hose connection port 17a of the water suction hose of the remaining water in the bath.

In addition, an operation panel 6 is provided at the upper center of the housing 1 . The operation panel 6 includes a power switch 39 , operation buttons 12 , 13 and a display 14 . In addition, the operation panel 6 is electrically connected to a control device 38 (see FIG. 2 ) provided at the lower portion of the housing 1 .

Fig. 2 is a side view schematically showing the internal structure of the washing machine according to the embodiment of the present invention.

As shown in FIG. 2 , the front reinforcement 37 is provided with a door 9 that closes an inlet for loading and unloading clothes provided in the approximate center of the front cover 1c. The door 9 is supported so as to be openable and closable via a hinge 9 c provided on the front reinforcement 37 . The door is opened by releasing a lock mechanism (not shown) by pressing a door opening button 9d (see FIG. 1 ) provided on the front cover 1c, and closed by pressing the door 9 against the front cover 1c to lock it. In addition, the front reinforcement 37 has a circular opening concentric with the opening of the outer tube 3 described later for taking in and out of clothes.

An input container 19 is provided on the upper left side in the cabinet 1 . A drawer-type detergent tray 7 can be attached to the input container 19 from the front opening. In the case of putting in detergent products, the detergent tray 7 is pulled out as indicated by the dashed-two dotted line in FIG. 1 . In addition, the input container 19 is fixed to the upper reinforcement 36 of the cabinet 1 . In addition, a water outlet 19a is provided slightly rearward on the left side of the input container 19 . This water outlet 19a is formed in the lowest position of the bottom surface of the injection container 19 formed in the shape of a mortar.

The water supply electromagnetic valve 4 (referring to FIG. 1 ), the bath water suction pump 17, the water level sensor 34 and other components related to water supply are provided on the rear side of the input container 19 . A water supply unit 15 is provided at the upper opening of the input container 19 .

Drum 2 serving as a washing and dehydrating drum has a bottomed cylindrical shape and is rotatably supported. In addition, the drum 2 has a plurality of through holes (not shown) for water and ventilation on its outer peripheral wall and bottom wall, and an opening 2a for taking and placing clothes is formed on the front end surface. The fluid equalizer 2b integrated with the drum 2 is provided in the peripheral edge part of the opening part 2a. In addition, the rotation center axis|shaft of the drum 2 is horizontal, or it inclines so that the opening part side may become high.

Outer cylinder 3 is cylindrical with bottom, and drum 2 is housed on the coaxial, front opening, and drum motor 11 is installed in the outer center of rear side end face. Drum motor 11 rotates drum 2 in forward and reverse directions. The rotating shaft of the drum motor 11 passes through the outer cylinder 3 and is combined with the drum 2 . In addition, an outer cylinder cover 3 d capable of storing water in the outer cylinder 3 is provided at the opening on the front surface of the outer cylinder 3 . Moreover, the lower side of the outer cylinder 3 is vibration-proof-supported by the damper 8 fixed to the base 1h. The shock absorbers 8 are disposed on the left and right, and mainly absorb vibrations in the vertical direction. A bellows 10 made of rubber is installed at the opening of the outer cylinder 3, and the outer cylinder 3 is water-sealed by closing the door 9.

A water supply port 3a for supplying water and/or detergents into the outer cylinder 3 is provided at the rear side of the outer cylinder 3 . The water supply port 3a and the water outlet 19a of the input container 19 are connected by a serpentine hose 20 made of rubber. In addition, a concave recess 3 f is provided on the bottom inner peripheral surface of the outer cylinder 3 so as to extend in the axial direction of the outer cylinder 3 . The bottom surface of the recessed portion 3f is an inclined surface descending from the front side to the rear side, and the drain port 21 is provided on the rear side of the recessed portion 3f. A serpentine hose 22 is connected to the drain port 21 via a joint 21a. An inflow port 18 for bottom circulating water is provided on the front side of the recessed portion 3f.

Drainage discharged from the drain port 21 is introduced into the filter case 23 through a water inlet (not shown), and then introduced into a drain hose 26 through a water outlet (not shown). A drain valve 25 is provided in the middle of the drain hose 26 .

In addition, an anti-air valve 3 e is provided at the lowermost portion of the rear end surface of the outer cylinder 3 . The bottom of the anti-air valve 3e is provided with a hole 3e1 communicating with the outer cylinder 3 (recess 3f), and the top of the anti-air valve 3e is connected with the water level sensor 34 by a pipe 35 to detect the water level in the outer cylinder 3

In addition, a filter case 23, a circulation pump 24, and a drain valve 25 are provided between the outer cylinder 3 and the base 1h.

The filter case 23 has a cylindrical shape with an opening on the front side, houses a detachable filter (not shown) inside, and captures foreign substances and lint in the washing water. In addition, the filter case 23 can easily attach or detach a filter by opening the door 1g provided in the lower front cover 1f and turning the handle 23d (illustration omitted). The filter case 23 is inclined such that the front side is higher than the rear side.

The circulation pump 24 includes a centrifugal pump, and consists of a pump casing, an impeller (also referred to as a rotor (runner)), and a circulation pump motor (both not shown).

A drying duct 29 is provided inside the rear cover 1d of the cabinet 1 . The drying duct 29 is connected with the air inlet provided at the rear of the outer cylinder 3 through a serpentine hose 29a made of rubber. In addition, a water-cooled dehumidification mechanism (not shown) is built in the drying duct 29 . The water-cooling and dehumidification mechanism communicates with the cooling water supply electromagnetic valve 4e described below. During the drying operation, cooling water for water cooling and dehumidification is introduced into the drying pipe 29 from the cooling water supply electromagnetic valve 4e.

In addition, during the drying operation, hot air is blown into the drum 2 by a heater, a blower fan, etc. not shown, and moisture is evaporated from the clothes. The high-temperature and high-humidity air is sucked into the drying duct 29, cooled and dehumidified by an unillustrated water-cooled dehumidification mechanism, then becomes low-temperature and low-humidity air, heated by an unillustrated heater, and then blown into the drum 2. In addition, heat pumps can be used instead of heaters and water-cooled dehumidification mechanisms.

Fig. 3 is a perspective view showing a circulation flow path provided in the outer cylinder cover.

As shown in FIG. 3 , one end of a serpentine hose 41 is connected to a discharge port 44 of the circulation pump 24 . The other end of the serpentine hose 41 is connected to the introduction port 3g of the circulation flow path 27 . The introduction port 3g is provided on the outer surface of the outer cylinder cover 3d.

The circulation flow path 27 is constituted by a tubular passage integrally formed with the inner peripheral wall of the outer cylinder cover 3d made of resin. The circulation flow path 27 is curved along an opening 3s (see FIG. 4 ) of the outer cylinder cover 3d, and is connected to a nozzle 27a formed on the upper portion of the outer cylinder cover 3d. The nozzle 27a sprays the washing water sprayed from the discharge port 44 of the circulation pump 24 into the drum 2 (see FIG. 2 ) from the upper portion of the outer cylinder cover 3d.

In the state where the drain valve 25 (refer to FIG. 2 ) is closed, if the circulation pump motor (not shown) of the circulation pump 24 rotates in the forward direction, the washing water in the outer cylinder 3 (refer to FIG. 2 ) will flow from the drain port. 21 (see FIG. 2 ) passes through the serpentine hose 22 (see FIG. 2 ), and is removed by a filter (not shown) in the filter housing 23 (see FIG. 2 ). Then, the washing water is sent into the circulation flow path 27 through the pump casing (not shown) and the serpentine hose 41, and is sprayed into the drum 2 (see FIG. 2 ) from the nozzle 27a.

In addition, if the circulation pump motor (not shown) of the circulation pump 24 rotates in reverse, the washing water in the outer cylinder 3 (see FIG. 2 ) passes through the serpentine hose 22 (see FIG. 2 ) from the drain port 21 (see FIG. 2) Foreign matter is removed by a filter (not shown) in the filter case 23 (see FIG. 2 ). Then, the washing water passes through a pump casing (not shown), and flows back into the tub 3 via the serpentine hose 40 (see FIG. 2 ) and the joint 18a (see FIG. 2 ). Thus, by rotating the circulation pump 24 in the reverse direction, the following detergent dissolving step is performed.

Fig. 4 is a front view showing the internal structure of the washing machine according to the embodiment of the present invention.

As shown in FIG. 4 , on the outer peripheral surface (upper surface) of the outer cylinder 3 , a convex fixing portion 3 t made of synthetic resin is formed. A support member 71 made of synthetic resin is fixed to the center of the upper reinforcement plate 36 in the left-right direction. One end of the coil spring 72 is hooked on the supporting member 71 , and the other end of the coil spring 72 is hooked on the fixing portion 3 t, and the outer cylinder 3 is suspended from the upper reinforcement plate 36 via the coil spring 72 . In addition, although illustration is omitted, the coil springs 72 are arranged front and rear, and mainly absorb vibrations in the front and rear directions of the outer cylinder 3 .

The water supply solenoid valve 4 and the heating unit 5 are arranged side by side in the left-right direction above the outer cylinder 3 . In addition, the water supply solenoid valve 4 and the heating unit 5 are respectively fixed to the upper reinforcement 36 on the left side of the coil spring 72 . Since the heating unit 5 is connected to the outer cylinder cover 3d through a flexible (elastic) heat-resistant hose 58 (elastic tube) described below, vibration during operation of the outer cylinder 3 is not transmitted. In addition, the parts fixed to the upper reinforcing plate 36, such as the water supply solenoid valve 4 described below, are also connected to the outer cylinder 3 through a flexible hose or serpentine hose, so the vibration of the outer cylinder 3 during operation will not be transmitted to the water supply. Solenoid valve 4 etc.

The water supply solenoid valve 4 includes detergent water supply solenoid valve (first solenoid valve) 4b, finishing agent water supply solenoid valve (second solenoid valve) 4c, outer cylinder water supply solenoid valve (third solenoid valve) 4d, cooling water supply solenoid valve ( The fourth solenoid valve) 4e is configured such that each discharge port faces forward.

Fig. 5 is a schematic diagram showing a water supply path of a heating unit.

As shown in FIG. 5 , the detergent water supply solenoid valve 4b is opened to supply the tap water from the water supply hose connection port 4a to the detergent injection chamber (not shown) of the detergent tray 7 through the water supply path L1. The tap water injected into the detergent injection chamber is injected from the input container 19 (see FIG. 2 ) through the serpentine hose 20 into between the drum 2 and the outer tub 3 together with the injected detergent.

When the finishing agent water supply electromagnetic valve 4c is closed, the tap water from the water supply hose connection port 4a is supplied to the finishing agent injection chamber (not shown) of the detergent tray 7 through the water supply path L2. The tap water poured into the finishing agent injection chamber is injected between the drum 2 and the outer cylinder 3 through the serpentine hose 20 from the injection container 19 (see FIG. 2 ) together with the injected finishing agent.

When the outer cylinder water supply electromagnetic valve 4d is opened, the tap water from the water supply hose connection port 4a is supplied between the drum 2 and the outer cylinder 3 through the water supply path L3 and the serpentine hose 20 .

The cooling water supply electromagnetic valve 4e supplies the tap water from the water supply hose connection port 4a to the water cooling and dehumidification mechanism (not shown) of the blowing duct 30 through the water supply path L4.

A switching valve 4f is provided in the middle of the water supply path L4 connecting the cooling water supply electromagnetic valve 4e and the blowing duct 30 . One discharge port 4f1 of this switching valve 4f is connected to the blast duct 30 side, and the other discharge port 4f2 is connected to a water supply path L5 (heat-resistant hose 57 described below). One end of the heating unit 5 is connected to the water supply path L5, and the other end of the heating unit 5 is connected to the water supply path L6 (heat-resistant hose 58 described below). Thus, by connecting the heating unit 5 via the switching valve 4f, the conventionally used water supply solenoid valve 4 can be used as it is, and thus the flow path including the heating unit 5 can be easily configured.

In addition, the bath water pumped by the bath water supply pump 17 from the water suction hose connection port 17a is supplied between the drum 2 and the outer cylinder 3 through the water supply paths L7 and L3 and the serpentine hose 20 .

FIG. 6 is an external perspective view showing the heating unit, and FIG. 7 is a front view showing the heating unit. In addition, illustration of the water supply paths L5 and L6 (heat-resistant hoses 57 and 58 ) connected to the water supply solenoid valve 4 (see FIG. 5 ) is omitted in FIG. 6 .

As shown in FIG. 6 , the heating unit 5 appropriately switches to generate steam and hot water, including an inlet P1 leading in tap water and an outlet P2 leading out heated tap water (steam or hot water).

In addition, the heating unit 5 has a substantially rectangular parallelepiped heater casing 51 formed in an elongated shape in the front-rear direction. The heater case 51 is composed of a housing portion 51a and a lid portion 51b, and accommodates an aluminum case 54 described below.

The cover part 51b is attached to the storage part 51a so that opening and closing is possible via the hinge part 51c. In addition, in the storage portion 51a, screw protrusions 51d, 51d are formed on the side plate opposite to the hinge portion 51c, and the screw protrusions 51d, 51d are screwed to the screw 51f from above, and are spaced apart from each other in the front-rear direction. ground setting. Fixing pieces 51e, 51e through which screws 51f are inserted are formed in the cover portion 51b at positions corresponding to the screw protrusions 51d.

As shown in FIG. 7 , a notch 51 h communicating with the inside of the heater case 51 is formed on the front plate of the storage portion 51 a. The notch 51h is formed in a U-shape so that the upper side is open. Part of the heat-resistant sleeve 53 attached to the aluminum case 54 described later protrudes from the notch 51h.

Moreover, the notch 51g (refer FIG. 8) which communicates with the inside of the heater case 51 is formed also in the rear plate of the accommodating part 51a similarly. In addition, a part of the heat-resistant sleeve 52 attached to the aluminum case 54 described later also protrudes from the notch 51g.

Fig. 8 is a sectional view taken along line II-I in Fig. 7, and Fig. 9 is a sectional view taken along line II-II in Fig. 8 . In addition, FIG. 9 has shown the state which removed the heater case 51 and the heat insulator 56 mentioned later from the heating unit 5. As shown in FIG.

As shown in FIG. 8 , the heating unit 5 includes an aluminum case 54 , a heating element 55 (heating portion), and a heat insulator 56 in addition to a heater case 51 and heat-resistant jackets 52 and 53 .

The aluminum case 54 is made of, for example, an aluminum alloy material with high thermal conductivity, and has a tube portion 54a formed axially in the front-rear direction and an element housing portion 54b that accommodates the heating element 55 around the tube portion 54a. The pipe part 54a has connection part 54c, 54d formed longer than the element accommodating part 54b in the axial direction (front-rear direction). Thereby, the heating element 55 mentioned later does not come into direct contact with tap water.

The heat-resistant sleeve 52 is attached to the connection portion 54c on the inlet P1 side, and the heat-resistant sleeve 53 is attached to the connection portion 54d on the outlet P2 side. In addition, the length L of the pipe portion 54a is much larger than the inner diameter (diameter) D of the pipe portion 54a. The heat-resistant sleeve 52 has a large-diameter portion 52a fitted with the connection portion 54c and a small-diameter portion 52b having an inner diameter D2 smaller than the inner diameter D1 of the large-diameter portion 52a, and the axis of the large-diameter portion 52a is aligned with the axis of the small-diameter portion 52b. The heart is the same. In addition, the axis of the pipe portion 54 a coincides with the axis of the heat-resistant sleeve 52 . Like the heat-resistant sleeve 52, the heat-resistant sleeve 53 has a large-diameter portion 53a and a small-diameter portion 53b, and the axes of the large-diameter portion 53a, the small-diameter portion 53b, and the pipe portion 54a coincide with each other.

In addition, between the large-diameter parts 52a, 53a and the small-diameter parts 52b, 53b, there is a shape in which the inner diameter decreases from the large-diameter parts 52a, 53a toward the small-diameter parts 52b, 53b. In addition, a part of the front end of the heat-resistant sleeve 52 including the large-diameter portion 52 a protrudes outward from the notch 51 g of the heater case 51 . In addition, a part of the front end including the large-diameter portion 53 a of the heat-resistant sleeve 53 protrudes outward from the notch 51 h of the heater case 51 .

The heating element 55 includes, for example, a PTC (Positive Temperature Coefficient: positive temperature coefficient) element (PTC heater). By using a PTC element, the upper limit temperature at the time of heating can be set in advance, and an excessive rise in element temperature can be prevented. In addition, the heating element 55 is not limited to a PTC element, and other types of elements such as a sheath heater may be used.

In addition, the heating element 55 is plate-shaped, and when inserted into the element accommodation part 54b, the element accommodation part 54b is arrange|positioned along the axial direction of the pipe part 54a. Therefore, the washing water can be heated throughout the axial direction of the pipe portion 54a.

The heat insulator 56 includes glass wool, asbestos, etc., and is arranged around the aluminum shell 54 . The aluminum case 54 is housed in the heater case 51 made of resin in a state of being wrapped around the heat insulator 56 . Thus, by arranging the heat insulator 56 around the aluminum case 54, the heat generated by the heating element 55 is suppressed from dissipating to the outside of the heater casing 51, and the heat generated by the heating element 55 can be efficiently transferred to the tube portion 54a.

As shown in FIG. 9 , the cross section of the aluminum case 54 is substantially rectangular, and the heating elements 55 are arranged on the upper, lower, left, and right sides of the central pipe portion 54 a. In addition, the aluminum case 54 has rectangular element accommodating portions 54b into which the heating element 55 is inserted, respectively above, below, on the left side, and on the right side of the pipe portion 54a. The cross section of the upper and lower component storage parts 54b is horizontally long, and the cross section of the left and right component storage parts 54b is vertically long. In addition, each component storage portion 54b is formed in a linear shape along the pipe portion 54a in a direction perpendicular to the paper surface. Moreover, although not shown in figure, the heating element 55 is accommodated in the element accommodation part 54b in the state covered with the insulating sheet.

In addition, the four corners of the aluminum case 54 have recesses 54 e cut in a concave shape toward the axis O. As shown in FIG. Thereby, the heat of the heating element 55 can be suppressed from being taken away by the corner portion, and the heat of the heating element 55 can be efficiently concentrated on the pipe portion 54a.

In the heating unit 5 thus constituted, by adopting a shape ranging from the small diameter portion 52b to the large diameter portion 52a at the inlet P1, and from the large diameter portion 53a to the small diameter portion 53b at the outlet P2, it is possible to use the shape between the inlet P1 and the outlet P2. Tap water (washing water) supplied from the inlet P1 side resides in the pipe portion 54a, can be in a mixed state of liquid and gas, and can generate steam.

Fig. 10 is a schematic configuration diagram of a heating element of a heating unit.

As shown in FIG. 10 , the heating element 55 is composed of a plate-shaped element portion 55 a and a pair of electrode plates 55 b and 55 c sandwiching both sides of the element portion 55 a. In addition, one of the electrode plates 55b and 55c is a positive electrode, and the other is a negative electrode. In addition, electrode plates 55b, 55b of adjacent element portions 55a are connected by a common line (lead) 55d. In addition, adjacent electrode plates 55c and 55c are connected by a common line (lead line) 55e. Further, lead wires 55 f and 55 g connected to the outside of the heating unit 5 are connected to electrode plates 55 b and 55 c of one heating element 55 among the four heating elements 55 . Connectors 55h, 55h are provided at the tips of the lead wires 55f, 55g, and the connectors 55h, 55h are connected to a connector (not shown) extending from the power source side.

Thus, a plurality of heating elements 55 are connected in parallel, and the lead wires 55f and 55g drawn out from the heating unit 5 are combined into one set (two), thereby reducing the number of wires connected to the heating unit 5 and making the heating unit 5 is easier to install. Therefore, even if the number of heating elements 55 is five or more, only two lead wires need to be drawn out from the heating unit 5 to deal with it. In addition, in this embodiment, the case where the heating unit 5 has four heating elements 55 has been described as an example, but may have five or more heating elements 55 or may have three or less heating elements 55 .

Fig. 11 is a sectional view taken along line III-III in Fig. 4 .

As shown in FIG. 11 , the heating unit 5 is arranged laterally above the outer cylinder 3 so that the axial direction of the pipe portion 54 a faces the front-rear direction. In addition, in the heating unit 5 , claws 51 i are formed on the upper surface of the heater case 51 , and the heating unit 5 is caught on the rear end edge of the upper reinforcement 36 by the claws 51 i. In addition, the heating unit 5 is arranged such that the central front side in the axial direction is in contact with the lower surface of the upper reinforcement 36 , and is arranged so that the rear central side in the axial direction protrudes rearward from the upper reinforcement 36 .

In addition, one end (downstream end) of a heat-resistant hose 57 is connected to the heat-resistant sleeve 52 of the heating unit 5, and the other end (upstream end) of the heat-resistant hose 57 is connected to the discharge port 4f2 of the switching valve 4f. In addition, one end (upstream end) of a heat-resistant hose 58 is connected to the heat-resistant sleeve 53 of the heating unit 5, and the other end of the heat-resistant hose 58 is connected to the introduction portion 3h formed on the front surface side of the outer cylinder cover 3d (see Figure 4) Connections.

In the heating unit 5 constituted in this way, in the state where the heating element 55 is energized, the switching valve 4f is switched to the heating unit 5 side, and the conduction/conduction of the cooling water supply solenoid valve 4e (refer to FIG. 5 ) of the water supply solenoid valve 4 is controlled. By disconnecting, tap water (washing water) is introduced into the pipe portion 54 a of the heating unit 5 through the heat-resistant hose 57 . Also, the tap water flowing through the pipe portion 54a is heated by the heat from the heating element 55 to generate steam or hot water.

That is, when steam ST is generated in the heating unit 5, first, the heating unit 5 is air-fired to raise the temperature of the pipe portion 54a before supplying tap water. That is, when the heating element 55 is energized, the aluminum case 54 is heated by heat transfer, and the pipe portion 54a (flow path surface) is heated. When the temperature of the pipe portion 54a rises to a predetermined temperature (maximum value), the cooling water supply solenoid valve 4e is controlled on/off to supply a predetermined amount of tap water to the pipe portion 54a through the heat-resistant hose 57 . In addition, the predetermined amount refers to an amount (a small amount) capable of generating steam. When a small amount of tap water is supplied to the pipe portion 54a, the tap water is vaporized to generate water vapor (steam ST). In this case, when tap water is supplied to the pipe portion 54a, the flow path surface temperature of the pipe portion 54a decreases, and after a predetermined amount (small amount) of tap water is supplied, the cooling water supply electromagnetic valve 4e is turned off to stop the supply of tap water, thereby The temperature of the pipe portion 54a rises again to a predetermined temperature. Thereby, tap water is intermittently supplied, and tap water is supplied while restoring the temperature of the pipe portion 54a, and the flow path surface temperature of the pipe portion 54a is maintained at or above the temperature range in which steam ST is generated, thereby generating steam ST intermittently.

In addition, when hot water HW is generated in the heating unit 5, the temperature of the flow path surface of the pipe portion 54a is controlled to be constant by energizing the heating unit 5 after the heating unit 5 is idle-boiled, or by energizing the heating unit 5 after starting the water supply. The temperature at which steam is produced. For example, by performing ON/OFF control of the cooling water supply electromagnetic valve 4e to continuously supply water, hot water (hot water HW) that cannot be converted into steam ST is generated.

The steam ST generated by the heating unit 5 is pushed out to the side of the heat-resistant hose 58 by the steam pressure generated at that time. In addition, the hot water HW generated by the heating unit 5 is pushed out to the side of the heat-resistant hose 58 by the water supply pressure (water pressure) from the cooling water supply solenoid valve 4e. Accordingly, the pipe portion 54a for supplying tap water is used as a common flow path regardless of whether steam ST is generated or hot water HW is generated.

Fig. 12 is a side cross-sectional view schematically showing the injection state of steam/hot water. In addition, in FIG. 12 , for convenience of description, hot air and hot water HW obtained by changing steam ST are superimposed and shown, but in fact, either hot air or hot water HW is supplied to clothes.

As shown in FIG. 12 , the direction of the nozzle 59 is set to face the corner portion (lowest end position) P on the bottom side that is the boundary between the main body plate 2c and the bottom plate 2d of the drum 2 . Then, the temperature of the steam ST generated by the heating unit 5 is lowered before being sprayed out from the nozzle 59 through the heat-resistant hose 58, thereby changing from the steam ST (gas state) to hot gas (high-temperature water droplets, liquid state), and the hot gas is sprayed on the clothes ( liquid), not steam (gas). On the other hand, the hot water HW generated by the heating unit 5 passes through the heat-resistant hose 58, is sprayed from the nozzle 59, and is sprayed on the laundry (clothes) in the hot water HW (liquid state).

Fig. 13 is a block diagram showing a washing machine.

As shown in FIG. 13, the control device 38 includes a microcomputer 50, a drive circuit 64, etc., and also has an input circuit for on-off signals of the operation buttons 12 and 13 shown in FIG. 1 and output signals from various sensors. In addition, the microcomputer 50 receives user's operation and various information signals in the washing process and drying process. The microcomputer 50 is connected with the drum motor 11 shown in FIG. 2 , the water supply solenoid valve 4 , the drain valve 25 , the blower fan (not shown) etc. via the drive circuit 64 , and controls their switching, rotation, and power supply. In addition, in order to notify the user of information about washing machine 100, display 14 (see FIG. 1), light emitting element 66, and buzzer 67 are controlled.

Fig. 14 is a process diagram illustrating the operation steps of the washing operation of the washing machine (with cycle washing/with drum rotation). In addition, circles (◯) in FIG. 14 indicate that tap water is supplied and the drain valve 25 is closed by performing on-off control of the water supply solenoid valves 4b, 4c, 4d, and 4e.

As shown in FIG. 14, in step S1, the control apparatus 38 receives the input of the program selection of the operation process of the washing machine 100 (program selection). Here, the user opens door 9, puts laundry into drum 2, and closes door 9. Then, the user operates the operation buttons 12 and 13 to select and input the program of the operation process. By operating the operation buttons 12 and 13 , the program of the selected operation process is input to the control device 38 . The control device 38 reads the corresponding operation mode from the operation mode database based on the program of the input operation process, and proceeds to step S2. In addition, in the following description, selection of a standard program (washing-rinsing twice-spinning) is taken as an example for description.

In step S2, control device 38 implements a process of detecting the weight (cloth amount) of the laundry thrown into drum 2 (cloth amount detection). Specifically, the control device 38 drives the drum motor 11 to rotate the drum 2, and calculates the weight (cloth amount) of the laundry before water filling.

In step S3, the control device 38 implements the process of calculating the amount of detergent and the operation time (calculation of the amount of detergent and operation time). Specifically, the control device 38 controls the water supply solenoid valve 4 to directly supply water to the water supply port 3a (see FIG. 2 ) of the outer cylinder 3 . The conductivity measuring unit of the control device 38 detects the conductivity (hardness) of the supplied water via a conductivity sensor (not shown) disposed on the inner bottom of the outer cylinder 3 . In addition, the temperature of the supplied water is detected by a sensor. Then, the water supply electromagnetic valve 4 is controlled to end the water supply to the outer cylinder 3 .

The control device 38 determines the amount of detergent to be injected and the operating time based on the amount of cloth detected in step S2, the electrical conductivity (hardness) of the water, and the temperature of the water by searching the map. Then, the control device 38 displays the determined amount of detergent and the operating time on the display 14 . In addition, although the device which supplies water to the outer cylinder 3 and detects the electric conductivity (hardness) and water temperature of water was demonstrated, it is not limited to this. For example, the electrical conductivity (hardness) and water temperature of the water during the previous operation may be stored in a storage unit (not shown) of the microcomputer 50 and used.

In step S4, the control device 38 implements the detergent input standby process (detergent input standby process). For example, the control device 38 proceeds to step S5 after waiting for a predetermined time. The user adds detergent products into the detergent tray 7 with reference to the amount of detergent displayed on the display 14 in standby. In addition, the control device 38 can also be configured as follows: by detecting the device (not shown) of the switch of the detergent tray 7, when the detergent tray 7 is opened and then closed, it is assumed that after the detergent is put in, the step is entered. S5.

In step S5, the control apparatus 38 implements a detergent dissolution process (detergent dissolution process). For example, the controller 38 controls the detergent water supply electromagnetic valve 4b to supply water to the powder detergent injection chamber and the liquid detergent injection chamber of the detergent box 7 via the water supply path L1. The detergent and water in the powder detergent input chamber and the liquid detergent input chamber pass through the detergent delivery pipe, the serpentine hose 20, the water supply port 3a located on the upper rear side of the outer cylinder 3, and the inner surface of the bottom wall of the outer cylinder 3. The water supply path flows into the concave portion 3f of the outer cylinder 3 from the outlet thereof.

After the water is supplied to a specified amount, the control device 38 controls the detergent water supply electromagnetic valve 4b to stop the water supply. Then, the control device 38 executes a detergent dissolving operation (detergent dissolving operation). Specifically, the control device 38 controls the circulation pump 24 (reverse rotation), and discharges the water and detergent sucked in from the drain port 21 through the serpentine hose 22 through the serpentine hose 40 from the inflow port 18 of the concave portion 3f.

The water and detergent discharged from the inflow port 18 flow through the recessed portion 3f, flow to the drain port 21, and circulate. Thereby, water and detergent are stirred, and detergent is dissolved in water. After a predetermined time (for example, 10 seconds), the control device 38 stops the circulation pump 24 and proceeds to step S6.

In step S6, the control device 38 implements a steam/hot water supply process (steam/hot water supply process). For example, the control device 38 controls the cooling water supply solenoid valve 4e, switches the switching valve 4f to the heating unit 5 side, and energizes the heating unit 5. The control device 38 generates steam or hot water in the heating unit 5 while rotating the drum 2 forward and reverse at a predetermined rotation speed (for example, 40 r/min).

For example, in a washing machine with a rating of 10 kg, if it is determined that 6 kg of clothes have been put in through the detection of the amount of cloth in step S2, it is judged that the distance between the nozzle 59 and the clothes is small, and hot water HW is generated in the heating unit 5. (For example, 25° C. to 65° C.), instead of steam ST, hot water is sprayed from the nozzle 59 to the clothes.

In addition, when it is determined by the cloth amount detection in step S2 that 2 or 3 kg of laundry has been put in, a constant distance is maintained between the outlet of nozzle 59 and the laundry, so steam ST is generated in heating unit 5 . Thereby, the steam ST generated by the heating unit 5 passes through the heat-resistant hose 58 and the nozzle 59 , and is sprayed out from the outlet of the nozzle 59 . Then, the temperature drops before being sprayed from the nozzle 59, and the steam ST becomes high-temperature hot air, and the mist-like high-temperature hot air is sprayed on the clothes.

In addition, through the detection of the amount of cloth in step S2, not only the control of switching between steam and hot water is performed, but also the detection of the amount of cloth in step S2 determines that 6 kg of clothing has been put in, the distance between the nozzle 59 and the outlet of the clothes is small, Therefore, it is possible to generate hot water HW in the heating unit 5, and then generate steam ST to spray mist-like high-temperature hot air on the clothes when the clothes contain water and the volume of the clothes decreases.

Thus, the control can be divided into two stages, that is: the distance between the nozzle 59 and the clothes is judged by the cloth amount detection in step S2, not only whether to generate steam ST or hot water HW is determined, but also to determine whether the nozzle 59 is far from the clothes. When the distance is small, the hot water HW is sprayed first to reduce the volume of the clothes, and when it is judged that there is a certain distance between the nozzle 59 and the clothes, the steam ST is sprayed. That is, it is not necessary to switch between steam ST and hot water HW according to the amount of laundry (laundry).

In step S7, the control device 38 implements the pre-washing stirring step 1. Here, the pre-washing stirring process 1 refers to spraying steam or hot water in step S6 to the clothes, and then spraying tap water with a higher temperature to the clothes, and stirring the detergent produced in the detergent dissolution process of step S5. water so that it soaks into the clothing.

Specifically, the control device 38 controls the drum motor 11 to rotate the drum 2 at a prescribed rotational speed (for example, 40rpm [r/min]) to change clothes, and controls the circulation pump 24 to make it reach a prescribed rotational speed (for example, 2600r/min). ) (forward rotation), the washing water with high detergent concentration sucked from the drain port 21 is sprayed into the drum 2 from the nozzle 27a provided at the opening of the outer cylinder 3 . Thus, by mixing washing water with a high concentration of detergent (washing water) and washing water with a high temperature such as hot water, enzymes in the detergent can be activated, and the washing water can be fully immersed in the clothes to improve the detergency.

In addition, in this embodiment, step S6 and step S7 are performed as independent processes, but step S7 may be integrated into step S6, and the circulation pump 24 may be controlled to circulate the washing water while supplying steam or hot water.

In step S8, the control apparatus 38 implements a rotary water supply process (rotary water supply process). Specifically, the control device 38 controls the detergent water supply solenoid valve 4b and the tub water supply solenoid valve 4d to increase the water level of the washing water in the tub 3 . Then, the control device 38 controls the drum motor 11 to rotate the drum 2 at a predetermined rotation speed (for example, 40 r/min) to change clothes. In addition, the control device 38 controls the circulation pump 24 so that it reaches a predetermined rotation speed (for example, 2600r/min) (forward rotation), and the washing water with high detergent concentration sucked from the drain port 21 flows from the opening provided at the opening of the outer cylinder 3 The nozzle 27a sprays out toward the inside of the drum 2 so as to soak into the laundry inside the drum 2 .

And, after the water level of the washing water in the outer tub 3 rises to a predetermined water level, the water supply is stopped. After the predetermined time elapses from the start of the swirl water supply process, the swirl water supply process is terminated, and the process proceeds to step S9.

In step S9, the control device 38 implements the pre-washing stirring step 2. The pre-washing stirring process here refers to a process of circulating the washing water remaining at the bottom of the outer tub 3, thereby improving the detergency.

Specifically, the control device 38 controls the circulation pump 24 to reach a predetermined rotational speed (for example, 3200r/min), so that the washing water sucked from the drain port 21 flows into the drum 2 from the nozzle 27a provided at the opening of the outer cylinder 3. Spray out, and control the drum motor 11 to make the drum 2 rotate at a specified rotational speed (for example, 100r/min), so that under the action of centrifugal force, the clothes inside the drum 2 will be attached to the inner surface of the outer peripheral wall of the drum to prevent the clothes from being applied from above the drum. The mechanical force produced when falling.

In addition, in this embodiment, although the drum 2 is rotated forwardly, it may rotate backwardly or forwardly and reversely. After a predetermined time (for example, 3 minutes), the control device 38 ends the pre-washing and stirring process, and proceeds to step S10.

In step S10, the control device 38 implements the main washing and stirring process. Here, the main washing process refers to lifting the clothes staying in the lower part of the drum 2 by the rotation of the drum 2 and dropping them from the upper part of the drum 2 to apply mechanical force to the clothes for beat washing.

Specifically, the control device 38 controls the circulation pump 24 so that it reaches a predetermined flow rate (for example, 3200r/min), and the washing water sucked from the drain port 21 is sprayed into the drum 2 from the nozzle 27a provided at the opening of the outer cylinder 3. , and the drum motor 11 is controlled to rotate the drum 2 at a predetermined rotational speed (for example, 40 r/min), thereby hammer washing the clothes inside the drum 2 . After a predetermined time (for example, 6 minutes) has elapsed, the control device 38 ends the main washing and stirring process, and proceeds to step S11.

In step S11, the control device 38 implements a drainage process. The control device 38 stops the drum motor 11 and the circulation pump 24, opens the drain valve 25, and drains the washing water in the tub 3. The water level sensor 34 continues to monitor the water level of the washing water in the tub 3 being drained. If the detection value of the water level sensor 34 is lower than the predetermined water level, the control device 38 ends the drainage process and proceeds to step S12.

In step S12, the control device 38 implements the dehydration 1 step. The control device 38 makes the drum 2 reversely rotate at a high speed (for example, 1250r/min) while keeping the drain valve 25 open to remove the washing water contained in the clothes. When the predetermined time has elapsed, the control device 38 ends the dehydration 1 step, and proceeds to step S13.

In step S13, the control device 38 implements a rotary watering process. The control device 38 rotates the drum 2 at a reverse medium speed (for example, 260r/min), and controls the outer cylinder water supply solenoid valve 4d to spray water on the clothes while the drain valve 25 is opened. The control timing of the outer cylinder water supply solenoid valve 4d at this time is determined based on the amount of cloth detected in step S2. After the specified time has elapsed, the water supply is stopped. Circulation pump 24 is controlled to a predetermined flow rate (for example, 3200r/min), and the washing water sucked from drain port 21 is sprayed into drum 2 from nozzle 27a provided at the opening of tub 3 . When a predetermined time elapses, the circulation pump 24 is stopped, the drain valve 25 is opened, and the rinse water in the outer tub 3 is drained.

In step S14, the control device 38 implements the dehydration 2 process. The control device 38 makes the drum 2 reversely rotate at a high speed (for example, 1250r/min) while keeping the drain valve 25 open to remove the washing water contained in the clothes. When the predetermined time has elapsed, the control device 38 ends the dehydration 2 process, and proceeds to step S15.

In step S15, the control device 38 implements a water supply process. The control device 38 closes the drain valve 25 and controls the detergent water supply electromagnetic valve 4b to supply rinse water into the tub 3 . When the water level rises to a predetermined level, the water supply is stopped, the control device 38 ends the water supply process, and the process proceeds to step S16.

In step S16, the control device 38 implements the finishing agent water supply process. The control device 38 controls the finishing agent water supply electromagnetic valve 4c to supply the rinsing water containing the softening finishing agent into the outer cylinder 3 .

In step S17, the control device 38 implements a rotary water supply and replenishment process. The control device 38 controls the detergent water supply solenoid valve 4b and the outer cylinder water supply solenoid valve 4d to supply water to the outer cylinder 3 to a predetermined water level. In addition, the control device 38 controls the drum motor 11 to rotate the drum 2, controls the circulating pump 24 to achieve a predetermined flow rate (for example, 2600r/min), and makes the rinse water sucked from the drain port 21 flow through the nozzle provided at the opening of the outer cylinder 3. 27a sprays to the inside of the drum 2, so that the softening agent is soaked into the clothes.

In step S18, the control device 38 implements the rinsing and stirring process. The control device 38 controls the drum motor 11 to rotate the drum 2, controls the circulation pump 24 to make it reach a predetermined flow rate (for example, 3200r/min), and makes the rinsing water sucked from the drain port 21 flow from the nozzle 27a provided at the opening of the outer cylinder 3 to the The inner spray of the drum 2 rinses the laundry. Then, when the predetermined time has elapsed, the control device 38 ends the rinsing and stirring process, and proceeds to step S19.

In step S19, the control device 38 implements a drainage process. The control device 38 stops the drum motor 11 and the circulation pump 24, and opens the drain valve 25 to drain the rinsing water in the tub 3. The water level sensor 34 continues to monitor the water level of the washing water in the tub 3 being drained. If the detection value of the water level sensor 34 is lower than the predetermined water level, the control device 38 ends the drainage process and proceeds to step S20.

In step S20, the control device 38 implements the dehydration process. Specifically, the control device 38 opens the drain valve 25, and controls the drum motor 11 to rotate the drum 2 at a high speed (for example, 1000 r/min), so that the clothes are centrifugally dehydrated. Then, when a predetermined time elapses, the control device 38 stops the drum motor 11, closes the drain valve 25, and ends the washing program (washing-rinsing-spinning).

Fig. 15 is a process diagram illustrating the operation steps of the washing operation of the washing machine (without cycle washing/drum rotation). Fig. 16 is a process diagram illustrating the operation steps of the washing operation of the washing machine (without cycle washing/drum rotation). In addition, the process of FIG. 15 refers to the case where the pre-washing agitation 2 (step S9) is excluded from the process of FIG. The operation of Fig. 16 refers to removing pre-washing cleaning 2 (step S9) from the operation of Fig. 14 (when the heating unit 5 works, the control circulation pump 24 does not carry out circulation cleaning), and in the operation of step S6, cylinder 2 is stopped to rotate Case.

Even in the process shown in Fig. 15 and Fig. 16, by mixing the washing water (washing water) with high detergent concentration and the washing water with high temperature such as hot water, the enzyme in the detergent can be activated and the washing The water fully soaks into the clothes to enhance the detergency. In addition, as described above, step S6 and step S7 are performed as independent processes, but step S7 may be integrated into step S6, and the circulation pump 24 may be controlled to circulate the washing water while supplying steam or hot water.

As described above, according to the washing machine 100 of the present embodiment, by having the heating unit 5 that switches the washing water to generate the hot water HW and the steam ST, it is possible to spray the hot water HW to the clothes when the distance between the nozzle 59 and the clothes is small. When the distance between the nozzle 59 and the clothes is large, the hot air is sprayed on the clothes, so that damage and discoloration of the cloth can be prevented. In addition, since generation of steam ST and hot water HW can be switched by one pipe portion 54a (common pipe portion 54a), heating unit 5 can be downsized.

In addition, in this embodiment, by configuring the heating element 55 using a PTC element, the temperature at the time of heating the tube portion 54a can be easily controlled.

In addition, in this embodiment, by connecting the heating unit 5 to the water supply solenoid valve 4, the conventional water supply solenoid valve 4 can be used, and the flow path including the heating unit 5 can be configured more simply. In addition, the steam ST and the hot water HW can be switched only by ON/OFF control of the water supply solenoid valve 4 . That is, the flow rate of tap water can be controlled by ON/OFF control of the water supply solenoid valve 4 , so steam ST can be generated by reducing the flow rate of tap water, and hot water HW can be generated by increasing the flow rate of tap water.

In addition, in this embodiment, by covering the periphery of the heating element 55 with the heat insulator 56, heat generated by the heating element 55 can be suppressed from radiating to the outside, the heat can be efficiently transferred to the tube portion 54a side, and power consumption can also be suppressed. quantity.

In addition, in this embodiment, by fixing the heating unit 5 to the upper reinforcing plate 36 constituting a part of the cabinet 1, and connecting the heating unit 5 and the outer cylinder 3 via the elastic heat-resistant hose 58, it is possible to prevent the The vibration of the outer cylinder 3 is transmitted to the heating unit 5, and the steam ST or hot water HW can be stably generated in the heating unit 5.

In addition, in this embodiment, a plurality of heating elements 55 are provided, and each heating element 55 is electrically connected in parallel, so that two electric wires (lead wires 55f, 559 ) drawn out from the heating unit 5 can be provided. Thereby, there is no need to arrange many wires, thus making its installation in the washing machine 100 easier.

As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment, It can implement in various forms. For example, the case of mounting a plurality of heating elements 55 connected in parallel has been described as an example, but it is not limited to this. temperature, you can also control the temperature of the hot water HW.

In addition, in this embodiment, the case of heating tap water from a tap was described as an example, but the washing water remaining at the bottom of the outer tub 3 may be heated using the circulation pump 24 . By heating the wash water, the enzymes in the detergent can be activated to improve the detergency.

Claims (6)

1. A washing machine, comprising: an inner tub for storing laundry; an outer tub for storing the inner tub in such a manner that the inner tub can rotate freely; a water supply valve for supplying water to the outer tub; The washing machine is characterized by: a heating device for heating the washing water supplied into the inner tub, The heating device includes: a pipe part in which the wash water flows; and a heating part which switchably generates hot water and steam by heating the wash water flowing in the pipe part, The hot water and the steam are sprayed onto the laundry in the inner tub from nozzles disposed toward the lowermost end of the inner tub through a common flow path, The hot water is sprayed to the laundry when the distance between the nozzle and the laundry is small, and the steam is sprayed to the laundry when the distance between the nozzle and the laundry is large. . 2. The washing machine according to claim 1, characterized in that: The heating part is a PTC heater. 3. The washing machine according to claim 1 or 2, characterized in that, The heating device is connected with the water supply valve. 4. The washing machine according to claim 1 or 2, characterized in that, The periphery of the heating part is surrounded by a heat insulating material. 5. The washing machine according to claim 1 or 2, characterized in that, The heating part has a plurality of heating elements, The heating elements are electrically connected in parallel. 6. The washing machine according to claim 1 or 2, characterized in that, The heating device is fixed to the case elastically supporting the outer cylinder, The heating device and the outer cylinder are connected via an elastic tube.