CN220867773U

CN220867773U - Washing machine

Info

Publication number: CN220867773U
Application number: CN202322556782.4U
Authority: CN
Inventors: 范艳芳; 余永刚; 王忠卿; 汪文杰; 张全涛
Original assignee: TCL Home Appliances Hefei Co Ltd
Current assignee: TCL Home Appliances Hefei Co Ltd
Priority date: 2023-09-19
Filing date: 2023-09-19
Publication date: 2024-04-30
Anticipated expiration: 2033-09-19

Abstract

The present application provides a washing machine, comprising: an outer tub; the inner barrel is arranged in the outer barrel, and forms an inner barrel gap and an outer barrel gap with the outer barrel, and comprises a first barrel bottom and a first barrel wall, wherein the first barrel wall is arranged around the periphery of the first barrel bottom; the steam washing device comprises a steam generator and an air outlet pipe which are connected with each other, wherein the steam generator is used for generating high-temperature steam, the air outlet pipe is provided with an air outlet, the air outlet is used for spraying the steam, and the air outlet is communicated with the gap between the inner barrel and the outer barrel and is arranged opposite to the first barrel wall. The high-temperature steam can accelerate the movement speed of molecules in dirt between the inner barrel and the outer barrel, the aim of eliminating various stubborn stains is fulfilled by destroying the binding force between the inner barrel and the outer barrel, and meanwhile, various bacteria, mites, microorganisms and pathogens attached to the surface of an object are completely eliminated, so that the gap between the inner barrel and the outer barrel is cleaned and disinfected by the high-temperature steam.

Description

Washing machine

Technical Field

The application belongs to the technical field of electronics, and particularly relates to a washing machine.

Background

The washing machine is an electric appliance widely used in daily life for washing clothes of people. After the washing machine finishes washing clothes and draining water, partial residual moisture exists in the outer barrel, and the washing machine is in an ultra-humid environment for a long time between the inner barrel and the outer barrel after washing is finished, so that bacteria are easy to breed in a gap between the inner barrel and the outer barrel to generate peculiar smell, and the health of a user is influenced.

Disclosure of utility model

The embodiment of the application provides a washing machine which can clean and disinfect a gap between an inner barrel and an outer barrel by high-temperature steam, so that the problem that bacteria are easy to breed in the gap between the inner barrel and the outer barrel to generate peculiar smell is solved, and the health of a user is ensured.

An embodiment of the present application provides a washing machine, including:

an outer tub;

The inner barrel is arranged in the outer barrel, and forms an inner barrel gap and an outer barrel gap with the outer barrel, and comprises a first barrel bottom and a first barrel wall, wherein the first barrel wall is arranged around the periphery of the first barrel bottom;

The steam washing device comprises a steam generator and an air outlet pipe which are connected with each other, wherein the steam generator is used for generating high-temperature steam, the air outlet pipe is provided with an air outlet, the air outlet is used for spraying the steam, and the air outlet is communicated with the gap between the inner barrel and the outer barrel and is arranged opposite to the first barrel wall.

Optionally, the outer barrel includes second barrel head and second barrel wall, the second barrel wall centers on the periphery of second barrel head sets up, the second barrel wall is including keeping away from the outer barrel top of second barrel head, steam washing device set up in outer barrel deviates from interior barrel one side, the gas outlet set up in outer barrel top.

Optionally, a guiding structure is disposed at one end of the air outlet pipe facing the inner barrel, so as to spray the steam sprayed from the air outlet pipe to the first barrel wall in an inclined manner, and the inclined direction is the direction facing the first barrel bottom.

Optionally, the steam washing device further comprises a compression pump, wherein the compression pump is arranged between the steam generator and the air outlet, and the compression pump is used for pressurizing the steam to form high-temperature and high-pressure steam.

Optionally, the air outlet pipe is a venturi tube, and the venturi tube can accelerate steam inside.

Optionally, the venturi tube comprises an air inlet end, a venturi tube, a diffusion tube and a tail tube which are sequentially connected;

The air inlet end comprises an outer pipe and an inner pipe, the inner pipe is arranged in the outer pipe at intervals to form an air chamber, one end of the inner pipe is connected with the air chamber for introducing steam, the other end of the inner pipe is used for leading out steam, the outer pipe is provided with an air suction port, and the air suction port is positioned at one side of the other end of the inner pipe, which is away from the throat pipe;

The cross-sectional area of the tail pipe is larger than that of the throat pipe, and the cross-sectional area of the diffusion pipe gradually increases from the throat pipe to the tail pipe.

Optionally, the steam washing device further comprises a support, the support is mounted on one side, away from the inner barrel, of the outer barrel, the air outlet pipe is arranged on one side, facing the outer barrel, of the support, and the steam generator is arranged on one side, facing away from the outer barrel, of the support.

Optionally, the steam generator comprises a box body and a protection valve, wherein the protection valve is arranged in the box body, and when the temperature or the pressure in the box body exceeds a threshold value, the protection valve is opened to lead out the high-temperature steam in the box body.

Optionally, the outer barrel comprises a second barrel bottom and a second barrel wall, the second barrel wall surrounds the periphery of the second barrel bottom, the steam washing device is arranged on one side, deviating from the inner barrel, of the outer barrel, and the air outlet is arranged in the middle of the second barrel wall.

Optionally, the steam washing device includes a plurality of the outlet duct, at least one the outlet duct is towards the one end of interior bucket is equipped with first guide structure to with follow the steam slope of outlet duct blowout is spouted to first bucket wall, and the incline direction is towards first barrel bottom direction, at least one the outlet duct is towards the one end of interior bucket is equipped with second guide structure, in order to follow the steam slope of outlet duct blowout is spouted to first bucket wall, and the incline direction is for keeping away from first barrel bottom direction.

In the washing machine provided by the embodiment of the application, the steam generator of the steam washing device generates high-temperature steam, and then the high-temperature steam is sprayed towards the gap between the inner barrel and the outer barrel through the air outlet of the air outlet pipe and is sprayed towards the first barrel wall of the inner barrel, so that the gap between the inner barrel and the outer barrel can be cleaned. The high-temperature steam can accelerate the movement speed of dirt internal molecules between the inner barrel and the outer barrel, the aim of eliminating various stubborn stains is fulfilled by destroying the binding force between the inner barrel and the outer barrel, and meanwhile, various bacteria, mites, microorganisms and pathogens attached to the surface of an object are completely eliminated, so that the gap between the inner barrel and the outer barrel is cleaned and disinfected by the high-temperature steam, the problem that peculiar smell is generated by bacteria easily growing in the gap between the inner barrel and the outer barrel is solved, and the health of a user is ensured.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the description of the embodiments will be briefly described below. It is evident that the drawings in the following description are only some embodiments of the application and that other drawings may be obtained from these drawings without inventive effort for a person skilled in the art.

For a more complete understanding of the present application and the advantages thereof, reference is now made to the following descriptions taken in conjunction with the accompanying drawings, in which like reference numerals represent like parts throughout the following description.

Fig. 1 is a schematic structural view of a washing machine according to an embodiment of the present application.

Fig. 2 is a schematic structural view of a part of the structure of the washing machine shown in fig. 1.

Fig. 3 is a sectional view showing a part of the structure of the washing machine shown in fig. 1.

Fig. 4 is another cross-sectional view of a portion of the structure of the washing machine shown in fig. 1.

Fig. 5 is an enlarged schematic view of an X portion of the washing machine shown in fig. 4.

Fig. 6 is a schematic view of a structure of an air outlet pipe in a part of the structure of the washing machine shown in fig. 5.

Fig. 7 is a schematic view of a structure of a cartridge and a protection valve in a part of the structure of the washing machine shown in fig. 5.

Reference numerals illustrate:

1. A washing machine;

20. an outer barrel, 21, an inner barrel gap, 22, a second barrel bottom, 24, a second barrel wall, 242 and an outer barrel top;

40. an inner tub 42, a first tub bottom 44, a first tub wall;

60. The steam washing device comprises a steam washing device body, 62, a steam generator, 622, a box body, 624, a protection valve, 626, a heating pipe, 64, an air outlet pipe, 641, an air outlet, 642, an air inlet end, 6422, an outer pipe, 6423, an air chamber, 6424, an inner pipe, 6425, an air suction port, 644, a throat pipe, 646, a diffusion pipe, 648, a tail pipe, 66, a compression pump, 68 and a bracket.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, embodiments of the application. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the application, its application, or uses. All other embodiments, which can be made by a person skilled in the art without any inventive effort, are intended to be within the scope of the present application based on the embodiments of the present application.

Referring to fig. 1 to 3, fig. 1 is a schematic structural diagram of a washing machine according to an embodiment of the present application, fig. 2 is a schematic structural diagram of a part of the washing machine shown in fig. 1, and fig. 3 is a cross-sectional view of a part of the washing machine shown in fig. 1. The washing machine 1 includes an outer tub 20, an inner tub 40, and a steam washing device 60. The inner tub 40 is disposed in the outer tub 20, and forms an inner and outer tub gap 21 with the outer tub 20. The inner tub 40 includes a first tub bottom 42 and a first tub wall 44, the first tub wall 44 being disposed around a periphery of the first tub bottom 42. The steam washing device 60 includes a steam generator 62 and an air outlet pipe 64 connected to each other, the steam generator 62 is used for generating high-temperature steam, the air outlet pipe 64 is provided with an air outlet 641, the air outlet 641 is used for spraying the steam, and the air outlet 641 is communicated with the inner and outer tub gaps 21 and is arranged opposite to the first tub wall 44.

The steam generator 62 of the steam washing apparatus 60 generates high-temperature steam, and then the high-temperature steam is sprayed toward the inner and outer tub gaps 21 through the air outlet 641 of the air outlet pipe 64 and toward the first tub wall 44 of the inner tub 40, so that the inner and outer tub gaps 21 can be washed. The high-temperature steam can accelerate the movement speed of dirt internal molecules between the inner barrel and the outer barrel 20, the aim of eliminating various stubborn stains is fulfilled by destroying the binding force between the inner barrel and the outer barrel, and meanwhile, various bacteria, mites, microorganisms and pathogens attached to the surface of an object are completely eliminated, so that the inner barrel and the outer barrel gaps 21 are cleaned and disinfected by the high-temperature steam, the problem that the inner barrel and the outer barrel gaps 21 are easy to breed bacteria to generate peculiar smell is solved, and the health of users is ensured.

In some examples, the steam generator 62 may be connected to a water inlet valve via a water line, which directly supplies water to the steam generator 62 for generating steam. The inlet valve may selectively supply water to the steam generator 62 or to the inner tub 40 as needed. The water pipe can be a hose, a hard pipe or other pipes. The steam generator 62 instantaneously heats a certain flow of water to 100 degrees or more to evaporate, thereby generating high temperature steam.

Referring to fig. 4 and 5 in combination, fig. 4 is another cross-sectional view of a portion of the structure of the washing machine shown in fig. 1, and fig. 5 is an enlarged schematic view of an X portion of the washing machine shown in fig. 4. In some embodiments, the steam wash device 60 further includes a compression pump 66, the compression pump 66 being disposed between the steam generator 62 and the air outlet 641, the compression pump 66 being configured to pressurize the steam to form high temperature, high pressure steam.

The compression pump 66 can pressurize the vaporized high-temperature steam to form high-temperature and high-pressure steam, and the high-temperature and high-pressure steam has stronger impact force and cleaning capability and can better clean the inner and outer barrel gaps 21.

It will be appreciated that after the steam is sprayed to the first tub wall 44 of the inner tub 40, the steam is reflected to the inner surface of the outer tub 20 due to the resistance of the inner tub 40 and washes the inner surface of the outer tub 20. The high-temperature steam or the high-temperature and high-pressure steam can be repeatedly reflected between the inner and outer tub 20, thereby cleaning and sterilizing different areas between the inner and outer tub 20.

It is understood that the number of outlet pipes 64 may be set as desired, such as 1 outlet pipe 64, 2 outlet pipes 64, or more outlet pipes 64. The number of the air outlets 641 of the air outlet pipes 64 may be set as desired, such as 1 air outlet 641, 2 air outlets 641, or more air outlets 641 per air outlet pipe 64.

In some embodiments, the outer tub 20 includes a second tub bottom 22 and a second tub wall 24, the second tub wall 24 is disposed around a periphery of the second tub bottom 22, the second tub wall 24 includes an outer tub top 242 remote from the second tub bottom 22, the steam washing device 60 is disposed on a side of the outer tub 20 facing away from the inner tub 40, and the air outlet 641 is disposed on the outer tub top 242. Because the air outlet 641 is provided at the top of the outer tub 20, the steam emitted from the steam washing device 60 is also opposite to the top of the inner tub 40, so that the steam can effectively cut into the hollow above the inner tub, and remove dirt and residues therein.

In the description of the present application, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more features.

In some embodiments, the air outlet pipe 64 is provided with a guide structure toward one end of the inner tub 40 to spray the steam sprayed from the air outlet pipe 64 obliquely toward the first tub wall 44 in a direction toward the first tub bottom 42.

The guiding structure of the air outlet pipe 64 can guide the steam, for example, when the steam is sprayed from the top of the outer tub 20 to the inner tub 40, the steam is guided to incline towards the bottom of the tub, so that the steam is sprayed towards the inner tub 40 obliquely, the steam is conveniently reflected to the inner surface of the outer tub 20 by the inner tub 40, the steam can reach the bottom of the inner tub 40, which is close to the first tub bottom 42, of the first tub wall 44 of the inner tub 40 and the bottom of the outer tub 20, which is close to the second tub bottom 22, of the second tub wall 24 of the outer tub 20 after multiple reflections, and the steam can be washed and disinfected in a large area by the first tub wall 44 and the second tub wall 24.

It should be noted that, the inclination angle of the guiding structure to the steam may be set according to needs, for example, the guiding structure may incline the steam by between 5 degrees and 30 degrees with respect to the horizontal direction.

In some examples, the directing structure may incorporate a deflector (not shown) for the outlet pipe 64 for directing the steam. Other guiding arrangements, such as an integral angled arrangement of the outlet tube 64, may be used to tilt the steam relative to horizontal, such as between 5 degrees and 30 degrees relative to horizontal.

It will be appreciated that in other embodiments, the outlet duct 64 may be directly opposite the inner tub 40, i.e., the steam is not sprayed obliquely toward the first tub wall 44.

Referring to fig. 6, fig. 6 is a schematic structural view of an air outlet pipe in the partial structure of the washing machine shown in fig. 5. In some embodiments, to increase the flow rate and spray area of the steam, the outlet 64 may be a venturi that accelerates the steam inside. As the steam flows through the venturi, the dynamic pressure reaches a maximum and the static pressure reaches a minimum at the narrowest point of the venturi (e.g., the nozzle head), and the velocity of the steam increases due to the reduced cross-sectional flow area. And the difference pressure difference is generated, the external pressure is larger than the static pressure of the head part of the spray head, the air is sucked into the venturi tube to be mixed with the steam and then sprayed out, and the flow speed of the steam during spraying is increased while throttling.

In some examples, the venturi includes an intake end 642, a throat 644, a diffuser 646, and a tailpipe 648 connected in sequence. The air inlet end 642 comprises an outer tube 6422 and an inner tube 6424, the inner tube 6424 is arranged in the outer tube 6422 at intervals to form an air chamber 6423, one end of the inner tube 6424 is connected to be used for introducing steam, the other end of the inner tube 6424 is used for leading out steam, the outer tube 6422 is provided with an air suction port 6425, and the air suction port 6425 is located on one side of the other end of the inner tube 6424, which is away from the throat 644. The cross-sectional area of the tailpipe 648 is larger than the cross-sectional area of the throat 644, and the cross-sectional area of the diffuser 646 increases gradually from the throat 644 toward the tailpipe 648.

In some embodiments, the steam washing device 60 further includes a bracket 68, the bracket 68 is mounted on a side of the outer tub 20 facing away from the inner tub 40, the air outlet pipe 64 is disposed on a side of the bracket 68 facing the outer tub 20, and the steam generator 62 is disposed on a side of the bracket 68 facing away from the outer tub 20. The bracket 68 may provide support and protection for the steam generator 62 and the outlet duct 64, facilitating installation of the steam generator 62 and the outlet duct 64.

In some examples, the steam generator 62 is disposed on a side of the support 68 remote from the outer tub 20, and the outlet duct 64 (e.g., venturi tube) and the compression pump 66 are disposed on a side of the support 68 facing the outer tub 20. The steam wash device 60 further includes a first mounting housing within which both the air outlet pipe 64 and the compressor pump 66 are disposed.

Referring to fig. 7, fig. 7 is a schematic view of a box and a protection valve in a part of the structure of the washing machine shown in fig. 5. In some embodiments, the steam generator 62 includes a box 622 and a protection valve 624, the protection valve 624 is disposed on the box 622, when the temperature and/or pressure in the box 622 exceeds a threshold value, the protection valve 624 is opened to guide out the high-temperature steam in the box 622, and the protection valve 624 is opened in time to prevent the air outlet pipe 64 from being blocked to cause the pressure in the steam washing device 60 to increase and explode. During use of the steam washing device 60, when the pressure or temperature inside the case 622 of the steam generator 62 exceeds a set value, the valve is opened, ensuring its safety. In some examples, a temperature sensor and/or pressure sensor may be provided within the cassette 622 that controls the protection valve 624 to open when the temperature sensor and/or pressure sensor detects that the temperature or pressure exceeds a set point. In some examples, the protection valve 624 may be a pressure controlled protection valve 624, the protection valve 624 automatically opening when the pressure within the cartridge 622 is greater than a set point. In some examples, the steam generator 62 further includes a heating tube 626, where the heating tube 626 is disposed within the case 622, and the heating tube 626 may instantaneously heat a certain flow of water to above 100 degrees to vaporize, thereby generating high temperature steam.

In some embodiments, the outer tub 20 includes a second tub bottom 22 and a second tub wall 24, the second tub wall 24 is disposed around a periphery of the second tub bottom 22, the steam washing device 60 is disposed at a side of the outer tub 20 facing away from the inner tub 40, and the air outlet 641 is disposed at a middle portion of the second tub wall 24. The air outlet 641 is provided in the middle of the second tub wall 24, that is, opposite to the middle of the first tub wall 44 of the inner tub 40, and is sprayed from the middle of the first tub wall 44 toward both ends, thereby better cleaning the inner and outer tub gaps 21.

In some embodiments, the steam washing device 60 includes a plurality of air outlet pipes 64, at least one air outlet pipe 64 is provided with a first guiding structure toward one end of the inner tub 40 to spray the steam sprayed from the air outlet pipe 64 toward the first tub wall 44 in a direction toward the first tub bottom 42, and at least one air outlet pipe 64 is provided with a second guiding structure toward one end of the inner tub 40 to spray the steam sprayed from the air outlet pipe 64 toward the first tub wall 44 in a direction away from the first tub bottom 42.

It should be noted that, the inclination angle of the first guiding structure and the second guiding structure to the steam may be set according to the needs, for example, the first guiding structure and the second guiding structure may incline the steam by between 5 degrees and 30 degrees with respect to the horizontal direction. In some examples, the first directing structure may be a deflector within one of the outlet pipes 64 for directing steam. The second guide structure may be another outlet pipe 64 with a guide plate built in for guiding the steam.

The steam cleaning device in the embodiment of the application can generate high-temperature and high-pressure steam, and the high-temperature and high-pressure steam is utilized to clean the gap 21 between the inner barrel and the outer barrel, so that the movement speed of molecules in dirt in the inner barrel and the outer barrel 20 can be accelerated, the aim of eliminating various stubborn stains is achieved by destroying the binding force between the inner barrel and the outer barrel, and meanwhile, various bacteria, mites, microorganisms and pathogens attached to the surface of an object are completely eliminated. Compared with the cleaning with the warm water, the cleaning mode has good effect, can effectively shorten the cleaning time, saves electricity and water, and can instantly dry the surfaces of the inner barrel and the outer barrel 20 to be cleaned; and the inner and outer barrels 20 can be disinfected and sterilized while being cleaned, so that bacterial growth is effectively inhibited.

The washing machine 1 further includes a housing in which the tub 20 is provided, and the position of the steam washing device 60 may be set as desired. For example, the steam washing device 60 may be disposed between the outer case and the tub 20. In some examples, the steam wash device 60 may be disposed above the tub 20 in the direction of gravity. In some examples, the steam wash device 60 may be disposed above the middle of the tub 20, i.e., the front projection of the steam wash device 60 on the housing overlaps the midline of the housing top wall. In other examples, the steam washing device 60 may be disposed at the circumferential side of the tub 20, and it is also understood that the steam washing device 60 may be disposed at the left or right side of the tub 20 in the width direction of the washing machine 1.

Wherein the inner tub 40 has an inlet for putting clothes into the inner tub 40 or taking clothes out of the inner tub 40, a first tub bottom 42 of the inner tub 40 is disposed opposite to the inlet, and a first tub wall 44 has a tub depth direction from the inlet toward the first tub bottom 42. The water or air path direction of the steam generator 62 is parallel to the tub depth direction. It is also understood that the direction of the inlet side of the steam generator towards the outlet side of the steam generator is parallel to the tub depth direction. The direction of the inlet side of the outlet pipe 64 toward the outlet side of the outlet pipe 64 is parallel to the tub depth direction. In order to further save the space in the washing machine 1, the direction of the water path or the air path of the steam generator 62 may be opposite to the direction from the inlet side of the outlet pipe 64 toward the outlet side of the outlet pipe 64.

The washing machine 1 of the present application may be a drum washing machine, a pulsator washing machine, or a washing and drying machine.

Reference herein to "an embodiment" or "implementation" means that a particular feature, component, or characteristic described in connection with the embodiment or implementation may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.

Although the present application has been described in terms of the preferred embodiments, it should be understood that the present application is not limited to the specific embodiments, but is capable of numerous modifications and equivalents, and alternative embodiments and modifications of the embodiments described above, without departing from the spirit and scope of the present application.

Claims

1. A washing machine, comprising:

an outer tub;

2. The washing machine of claim 1, wherein the outer tub includes a second tub bottom and a second tub wall disposed around a periphery of the second tub bottom, the second tub wall includes an outer tub top remote from the second tub bottom, the steam washing device is disposed at a side of the outer tub facing away from the inner tub, and the air outlet is disposed at the outer tub top.

3. A washing machine as claimed in claim 1 or 2 wherein a guide structure is provided at an end of the air outlet duct facing the inner tub to spray the steam sprayed from the air outlet duct obliquely toward the first tub wall in an oblique direction facing the first tub bottom.

4. The washing machine as claimed in claim 1, wherein the steam washing device further comprises a compression pump disposed between the steam generator and the air outlet, the compression pump being for pressurizing the steam to form high-temperature and high-pressure steam.

5. The washing machine as claimed in claim 1, wherein the air outlet pipe is a venturi pipe capable of accelerating the steam inside.

6. The washing machine as claimed in claim 5, wherein the venturi tube includes an air inlet, a throat, a diffuser, and a tail pipe connected in sequence;

7. The washing machine of claim 1, wherein the steam washing device further comprises a bracket mounted on a side of the outer tub facing away from the inner tub, the air outlet pipe is disposed on a side of the bracket facing the outer tub, and the steam generator is disposed on a side of the bracket facing away from the outer tub.

8. The washing machine as claimed in claim 7, wherein the steam generator includes a case and a protection valve provided to the case, the protection valve being opened to guide out high temperature steam in the case when the temperature and/or pressure in the case exceeds a threshold value.

9. The washing machine of claim 1, wherein the outer tub includes a second tub bottom and a second tub wall disposed around a periphery of the second tub bottom, the steam washing device is disposed at a side of the outer tub facing away from the inner tub, and the air outlet is disposed at a middle portion of the second tub wall.

10. The washing machine as claimed in claim 9, wherein the steam washing device includes a plurality of the air outlet pipes, a first guide structure is provided at one end of at least one of the air outlet pipes facing the inner tub to spray the steam sprayed from the air outlet pipe to the first tub wall in an inclined direction facing the first tub bottom direction, and a second guide structure is provided at one end of at least one of the air outlet pipes facing the inner tub to spray the steam sprayed from the air outlet pipe to the first tub wall in an inclined direction facing away from the first tub bottom direction.