A hot air device and a dishwasher

Abstract

The application relates to a hot air device and a dishwasher, the device comprising an air duct shell, a PTC heater and a fan assembly; the air duct shell is clamped in a gap between an inner container and an outer shell, a wind guide channel is formed in the air duct shell, and an air inlet and an air outlet are communicated with the wind guide channel; the air outlet is communicated with a washing cavity in the inner container; the air inlets are distributed on the top of the air duct shell, and at least one of the top plate, the back plate or the front plate of the outer shell is in a relative arrangement relationship with the air inlets; the PTC heater and the fan assembly are arranged on the air duct shell; the fan assembly is used for sucking external air from the air inlets into the wind guide channel and conveying the external air into the washing cavity through the air outlet; and the PTC heater is used for heating the external air in the wind guide channel to form hot air.

Description

Technical Field

[0001] This application relates to the field of dishwasher technology, and more particularly to a hot air device and a dishwasher. Background Technology

[0002] Traditional dishwasher drying methods generally fall into two categories: the first utilizes residual heat from inside the dishwasher for drying, and the second uses a combination of a heating module and a fan. The first method, using residual heat, doesn't require additional parts, but it necessitates heating the final wash cycle to a very high temperature to effectively utilize this heat, significantly impacting the overall energy consumption. In today's market, where energy efficiency is increasingly prioritized, the heating module and fan method can significantly improve the drying effect of the dishes inside the dishwasher with only a slight increase in overall energy consumption. Therefore, more and more dishwashers on the market are adopting this drying method.

[0003] While the drying method that combines heating modules and fans can improve the drying effect of tableware with only a slight increase in energy consumption, the fans are usually installed on the side of the dishwasher, sandwiched between the inner drum and the side panel. In this case, the fan's air intake is either facing the inner drum or the side panel, and the air intake effect is easily affected by the distance between the inner drum and the side panel. Utility Model Content

[0004] Therefore, it is necessary to provide a hot air device and a dishwasher to address the aforementioned problems with dishwashers.

[0005] The first aspect of this application provides a hot air device, which is applied to a dishwasher, the dishwasher including an inner tub and a outer shell, the device comprising:

[0006] The air duct housing is sandwiched in the gap between the inner liner and the outer shell. The air duct housing has an air guide channel and an air inlet and an air outlet communicating with the air guide channel. The air outlet communicates with the washing chamber in the inner liner. The air inlets are distributed on the top of the air duct housing, and the air inlets are arranged opposite to at least one of the top plate, back plate or front plate of the outer shell.

[0007] Both the PTC heater and the fan assembly are mounted on the air duct housing. The fan assembly is used to draw outside air from the air inlet into the air guide channel and deliver it to the washing chamber through the air outlet. The PTC heater is used to heat the outside air in the air guide channel to form hot air.

[0008] In one embodiment, the air guide channel is divided along its length into a sequentially connected air intake chamber, a heat exchange chamber, and an air supply chamber. The fan assembly is distributed in the air intake chamber, the PTC heater is distributed in the heat exchange chamber, the air inlet is connected to the air intake chamber, and the air supply chamber is connected to the washing chamber.

[0009] In one embodiment, the number of air inlets is not less than two, and the not less than two air inlets are spaced apart on the top of the air duct housing;

[0010] or,

[0011] The number of air inlets is one, and the air inlet is positioned relative to the front panel, top panel and back panel of the outer casing.

[0012] In one embodiment, the longitudinal section of the duct housing is L-shaped;

[0013] In one embodiment, the air duct housing includes a first housing, a second housing, and an air duct connector. The first housing and the second housing are connected to form the air guide channel. The air duct connector is connected to the first housing and / or the second housing, and the air guide channel communicates with the washing chamber through the air duct connector.

[0014] In one embodiment, the air guide channel is provided with not less than two sets of assembly positioning structures, each set of assembly positioning structures corresponds to a different size of the PTC heater, and one of the not less than two sets of assembly positioning structures is equipped with the PTC heater.

[0015] In one embodiment, the assembly positioning structure includes at least one set of two diagonally distributed limiting steps, the shape of which is adapted to the corner shape of the PTC heater.

[0016] In one embodiment, the air guide channel is further provided with not less than two sets of interference fit structures, the number of which is the same as the number of the assembly positioning structures, and the interference fit structures are used for the PTC heater to interference fit the assembly positioning structures.

[0017] In one embodiment, the interference fit structure includes at least one set of two limiting portions diagonally distributed, the limiting portions being elastically deformable, and the limiting portions being distributed on the assembly positioning structure.

[0018] A dishwasher is provided in the second aspect of this application, including the hot air device described in any of the preceding claims.

[0019] The hot air device and dishwasher in the above embodiments have at least the following beneficial effects:

[0020] This application provides a hot air device. The air duct housing is distributed along the height of the dishwasher and is sandwiched between the inner tub and the outer shell of the dishwasher. The assembly position of the air duct housing is reasonably designed without increasing the volume of the inner tub or the outer shell. The air duct housing has an air guide channel and an air inlet and an air outlet connected to the air guide channel. A PTC heater and a fan assembly are installed on the air duct housing. When the fan assembly is working, external air is drawn into the air guide channel through the air inlet. The air and the heat generated by the PTC heater are transferred to form hot air, which is then delivered to the washing chamber of the inner tub by the fan assembly. The air inlets are distributed on the top of the air duct housing, and the air inlets are arranged opposite to at least one of the top plate, back plate, or front plate of the outer shell. This avoids the air inlets being arranged opposite to the inner tub or the outer shell along the width direction of the dishwasher, increases the relative distance between the air inlets and the inner tub or the outer shell, reduces the resistance of external air entering the air guide channel at the air inlet, and improves the air intake efficiency while maintaining the same fan assembly speed, thereby improving the drying effect of the dishwasher. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the assembly of the hot air device with the inner liner and outer shell in one embodiment;

[0022] Figure 2 This is a schematic diagram of the hot air device in one embodiment. Figure 1 ;

[0023] Figure 3 An exploded view of the hot air device in one embodiment;

[0024] Figure 4 This is a cross-sectional view of the hot air device in one embodiment;

[0025] Figure 5 for Figure 4 Enlarged view of section A;

[0026] Figure 6 This is a schematic diagram of the assembly of the PTC heater and the duct housing in one embodiment (Model A);

[0027] Figure 7 This is a schematic diagram of the assembly of the PTC heater and the duct housing in one embodiment (Style B);

[0028] Figure 8 This is a schematic diagram of the hot air device in one embodiment. Figure 2 ;

[0029] Figure 9 This is an exploded view of a portion of the air duct housing in one embodiment.

[0030] Figure label:

[0031] 10 Duct housing, 11 Second housing, 12 First housing, 13 Duct connector, 101 Air guide channel, 102 Air inlet, 103 Air outlet, 104 Suction chamber, 105 Heat exchange chamber, 106 Air supply chamber, 107 Screw post, 108 Assembly hole.

[0032] 20PTC heater; 30 fan assembly;

[0033] 41 Ion generator; 42 Generator probe;

[0034] 50 Assembly positioning structure, 51 Limiting step, 51A First panel, 51B Second panel, 51C Third panel, 51D Fourth panel;

[0035] 61 Limiting part;

[0036] 200 inner liner; 300 outer shell. Detailed Implementation

[0037] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0038] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate for the embodiments of this application described herein.

[0039] like Figure 1-9 As shown, this embodiment provides a hot air device applied to a dishwasher, which includes an inner tub 200 and a outer shell 300. The device includes:

[0040] The air duct housing 10 is sandwiched in the gap between the inner liner 200 and the outer shell 300. The air duct housing 10 is provided with an air guide channel 101 and an air inlet 102 and an air outlet 103 communicating with the air guide channel 101. The air outlet 103 is connected to the washing chamber in the inner liner 200. The air inlets 102 are distributed on the top of the air duct housing 10, and the air inlets 102 are arranged opposite to at least one of the top plate, back plate or front plate of the outer shell 300.

[0041] Both the PTC heater 20 and the fan assembly 30 are mounted on the air duct housing 10. The fan assembly 30 is used to draw in external air from the air inlet 102 into the air guide channel 101 and deliver it to the washing chamber through the air outlet 103. The PTC heater 20 is used to heat the external air in the air guide channel 101 to form hot air.

[0042] This application discloses a dishwasher in which the air duct housing 10 is distributed along the height direction of the dishwasher and sandwiched between the inner tub 200 and the outer shell 300. The assembly position of the air duct housing 10 is rationally designed without increasing the volume of the inner tub 200 or the outer shell 300. The air duct housing 10 has an air guide channel 101 and an air inlet 102 and an air outlet 103 communicating with the air guide channel 101. A PTC heater 20 and a fan assembly 30 are installed on the air duct housing 10. When the fan assembly 30 is operating, external air is drawn into the air guide channel 101 through the air inlet 102, and the air generates heat with the PTC heater 20. Heat transfer occurs, generating hot air, which is then delivered to the washing chamber of the inner drum 200 by the fan assembly 30. The air inlets 102 are distributed on the top of the air duct housing 10, and the air inlets 102 are positioned opposite to at least one of the top plate, back plate, or front plate of the outer shell 300. This avoids the air inlets 102 being positioned opposite to the inner drum 200 or the outer shell 300 along the width direction of the dishwasher, thus increasing the relative distance between the air inlets 102 and the inner drum 200 or the outer shell 300. This reduces the resistance of external air entering the air duct 101 at the air inlets 102, thereby improving the air intake efficiency while maintaining the same rotation speed of the fan assembly 30, and thus improving the drying effect of the dishwasher.

[0043] The inner liner 200 can be a frame structure with one end open, which includes a first top plate, a first back plate, a first bottom plate, and a first left middle plate and a first right middle plate distributed on the left and right sides of the first back plate; the outer shell 300 of the dishwasher can be a frame structure with six panels, namely a second front plate, a second top plate, a second back plate, a second bottom plate, and a second left middle plate and a second right middle plate distributed on the left and right sides of the second back plate; the air duct housing 10 can be the gap between the first left middle plate and the second left middle plate, or the air duct housing 10 can be the gap between the first right middle plate and the second right middle plate.

[0044] The air duct housing 10 may be provided with an air guide channel 101 and an air inlet 102 and an air outlet 103 connected to the air guide channel 101. The PCT heater and the fan assembly 30 may be installed in the air guide channel 101. When the fan assembly 30 is working, it draws in external air at the air inlet 102 of the air duct housing 10 and transmits it along the path of the guide channel. The air entering the air guide channel 101 undergoes heat transfer with the heat generated by the PTC heater 20 to form hot air, and under the power of the fan assembly 30, the hot air is delivered to the washing chamber of the inner tank 200.

[0045] The air duct housing 10 can be a flat housing structure distributed along the height direction of the dishwasher. The air inlet 102 can be located at the top of the air duct housing 10, and the air inlet 102 can be arranged opposite to at least one of the second top plate, second back plate, or second front plate of the outer casing 300. This avoids the air inlet 102 on the air duct housing 10 being arranged opposite to the inner tub 200 or the outer casing 300 along the width direction of the dishwasher. Based on this, the gap distance between the air outlet 103 and the outer casing 300 or the inner tub 200 can be increased, reducing the resistance of external air entering the air duct 101 from the air inlet 102, and improving the air intake efficiency at the same rotation speed of the fan assembly 30.

[0046] like Figures 4 to 6 As shown, in addition to the features of the above embodiments, this embodiment further defines that: the air guide channel 101 is divided along the length direction into an air intake chamber 104, a heat exchange chamber 105 and an air supply chamber 106 connected in sequence, the fan assembly 30 is distributed in the air intake chamber 104, the PTC heater 20 is distributed in the heat exchange chamber 105, the air inlet 102 is connected to the air intake chamber 104, and the air supply chamber 106 is connected to the washing chamber.

[0047] The above embodiment further defines the air intake chamber 104, heat exchange chamber 105, and air supply chamber 106 as sequentially distributed along the length of the air duct housing 10. A fan assembly 30 is disposed within the air intake chamber 104, and a PTC heater 20 is disposed within the heat exchange chamber 105. External air is first drawn into the air intake chamber 104 by the fan assembly 30, then absorbs heat in the heat exchange chamber 105 under the action of the PTC heater 20 to form hot air, and finally is discharged from the air supply chamber 106 to the washing chamber of the inner liner 200. This segmented design of the air guide channel 101 avoids disordered flow and mutual interference of external air within a single complex cavity, reducing unnecessary eddies and pressure losses. Furthermore, the relatively cooler external air first passes through the fan assembly 30, which helps to dissipate heat from the fan assembly 30 itself, preventing the heat of the fan assembly 30 or the high temperature of the PTC heater 20 from affecting the normal operation of the fan assembly 30.

[0048] In some embodiments, a temperature sensor may be installed in the air supply cavity 106 to measure the temperature of the heated air and adjust the operating power of the PTC heater 20 in real time, so that the drying temperature in the washing cavity is more accurate.

[0049] like Figure 1 and Figure 2 As shown, in addition to the features of the above embodiments, this embodiment further specifies that: the number of air inlets 102 is not less than two, and the not less than two air inlets 102 are distributed at intervals on the top of the air duct housing 10;

[0050] or,

[0051] There is one air inlet 102, and the air inlet 102 is positioned relative to the front panel, top panel and back panel of the outer casing 300.

[0052] The above embodiment further defines that there are no fewer than two air inlets 102 spaced apart on the top of the air duct housing 10. The multiple spaced air inlets 102 allow external air to be drawn in from different areas on the top at the same time. This not only avoids the local high-speed concentration of airflow caused by a single large-diameter air inlet 102, which leads to eddies and suction noise, but also improves the uniformity and stability of the overall airflow in the suction cavity 104 by the multi-point spaced air inlet design, ensuring the stability of the operation of the fan assembly 30.

[0053] The number of air inlets 102 can be no less than two. For example, there are three air inlets 102, spaced apart on the top of the duct housing 10. Specifically, one air inlet 102 is positioned opposite the top plate of the housing 300, another air inlet 102 is positioned opposite the back plate of the housing 300, and the last one is positioned opposite the front plate of the housing 300. It should be noted that in other embodiments, the number of air inlets 102 can also be two, four, five, or more.

[0054] As shown in 1, in addition to the features of the above embodiments, this embodiment further defines that the longitudinal section of the air duct housing 10 is L-shaped;

[0055] The longitudinal cross-section of the air duct housing 10 can be L-shaped. Specifically, the vertical portion of the air duct housing 10 fits against the outer wall of the inner tub 200, making full use of the unused space between the inner tub 200 and the outer shell 300, with almost no additional increase in the overall volume of the dishwasher. The protruding portion of the air duct housing 10 is inserted into the washing cavity of the inner tub 200, avoiding the need for additional complex air supply ducts in the narrow space between the inner tub 200 and the outer shell 300, further reducing space requirements. In addition, the L-shaped structure design of the air duct housing 10 has good bending rigidity. It is supported by the vertical portion fitting against the outer wall of the inner tub 200, and the protruding portion is inserted into the washing cavity and fixed at the connection point. Together with the fixing points of the air duct housing 300 on the outer shell 300 or the inner tub 200, a stable support is formed for the air duct housing 10, making it less prone to deformation or abnormal noise during dishwasher operation.

[0056] Such as 2 and Figure 3 As shown, in addition to the features of the above embodiments, this embodiment further defines that: the air duct housing 10 includes a first housing 12, a second housing 11 and an air duct connector 13, the first housing 12 and the second housing 11 are connected and enclosed to form an air guide channel 101, the air duct connector 13 is connected to the first housing 12 and / or the second housing 11, and the air guide channel 101 is connected to the washing chamber through the air duct connector 13.

[0057] The duct housing 10 may include a first housing 12, a second housing 11, and a duct connector 13. The first housing 12 and the second housing 11 can be connected and enclosed to form an air guide channel 101. Both the first housing 12 and the second housing 11 can be elongated housing structures, and based on this, the air guide channel 101 formed by the cooperation of the first housing 12 and the second housing 11 is generally straight. It should be noted that the first housing 12 and the second housing 11 can be detachably connected by bolts, clips, etc., which facilitates the assembly of the fan assembly 30 and the PTC heating chamber or future maintenance.

[0058] The air duct connector 13 can at least partially be a shell structure perpendicular to the path direction of the air guide channel 101, thus the overall structure of the air duct connector 13 and the first shell 12 / second shell 11 has an L-shaped longitudinal section. The interior of the air duct connector 13 can be a cavity structure with openings at both ends, so that the air duct connector 13 can be used to connect the air guide channel 101 and the washing chamber. In addition, the air duct connector 13 can be detachably connected to the first shell 12 and / or the second shell 11 by means of bolts, clips, etc. Furthermore, the air duct connector 13 can also be detachably connected to the inner tank 200 by means of bolts, clips, etc.

[0059] like Figure 8 and Figure 9As shown, in addition to the features of the above embodiments, this embodiment further specifies that: a screw post 107 is provided on the air duct housing 10, and the screw post 107 is used to be adapted and installed with the ion generator 41.

[0060] An assembly hole 108 is provided on the air duct housing 10. The generator probe 42 is inserted into the assembly hole 108 and extends into the air guide channel 101 or into the channel between the air guide channel 101 and the washing chamber.

[0061] The ion generator 41, in conjunction with the generator probe 42, can have at least one or a combination of functions such as disinfection, odor elimination, or drying. Specifically, the ion generator 41 provides an electrolytic current to the generator probe 42, which is used to generate electrolytic ions within the air duct 101 or in the channel between the air duct 101 and the washing chamber.

[0062] The duct housing 10 may be provided with screw posts 107, which can fix the ion generator 41 to the duct housing 10. For example, there are two screw posts 107, which are distributed at intervals on the duct housing 10. Correspondingly, the housing of the ion generator 41 is provided with through holes corresponding to the positions of the screw posts 107. The bolt part passes through the through hole on the ion generator 41 and connects with the screw post 107, thereby fixing the ion generator 41 to the duct housing 10.

[0063] The duct housing 10 may be provided with mounting holes 108. There may be two mounting holes 108, which correspond to the positive and negative electrodes of the generator probe 42. It should be noted that the mounting holes 108 may be distributed on the duct connector 13 or on the air guide channel 101.

[0064] like Figures 4 to 7 As shown, in addition to the features of the above embodiments, this embodiment further specifies that: there are not less than two sets of assembly positioning structures 50 in the air guide channel 101, and the size of the PTC heater 20 assembled in each set of assembly positioning structures 50 is different, and one of the not less than two sets of assembly positioning structures 50 is equipped with a PTC heater 20.

[0065] The above embodiment further specifies that an assembly positioning structure 50 for installing the PTC heater 20 is provided in the air guide channel 101. With no less than two sets of assembly positioning structures 50, the air guide channel 101 can accommodate PTC heaters 20 of different sizes, satisfying the diversity of selection.

[0066] The assembly positioning structure 50 can be a structure used to adapt to the PTC heater 20. There can be at least two sets of assembly positioning structures 50, each set adapting to a different size PTC heater 20. For example, there are two sets of assembly positioning structures 50, one set adapting to a PTC heater 20 of size A, and the other adapting to a PTC heater 20 of size B. It should be noted that in other embodiments, the assembly positioning structure 50 within the air guide channel 101 can be three, four, five, or more sets to accommodate PTC heaters 20 of different sizes.

[0067] In addition, in this embodiment, the positional space defined between the two sets of assembly positioning structures 50 overlaps, so that only one of the assembly positioning structures 50 is allowed to assemble the PTC heater 20 at any given time. In other embodiments, the positional space defined between the two sets of assembly positioning structures 50 does not overlap, so that each assembly positioning structure 50 can assemble the same number of PTC heaters 20 at the same time.

[0068] like Figures 4 to 7 As shown, in addition to the features of the above embodiments, this embodiment further defines that: the assembly positioning structure 50 includes at least one set of two limiting steps 51 distributed diagonally, and the shape of the limiting steps 51 is adapted to the corner shape of the PTC heater 20.

[0069] The above embodiments further define that the limiting steps 51 are adapted to the corner shapes of the PTC heater 20. The PTC heater 20 can be initially limited and assembled by a set of two limiting steps 51 that are diagonally distributed. Since the number of assembly positioning structures 50 is not less than two sets, two different sizes of PTC heaters 20 can be adapted to be assembled according to the limiting steps 51 distributed in different positions.

[0070] Among them, a set of two diagonally positioned internal limiting steps 51 can initially fix the PTC heater 20. The limiting steps 51 include two first panels 51A and second panels 51B that are perpendicular or at a certain angle. Taking the overall longitudinal section of the PTC heater 20 as an example, the first panel 51A and the second panel 51B are in a perpendicular position. The two limiting steps 51 are respectively adapted to the upper left corner and the lower right corner of the PTC heater 20, or the two limiting steps 51 are respectively adapted to the lower left corner and the upper right corner of the PTC heater 20.

[0071] It should be noted that in some embodiments, each set of assembly positioning structures 50 has two sets of limiting steps 51. One set of two limiting steps 51 are adapted to the lower left corner and the upper right corner of the PTC heater 20, respectively, while the other set of two limiting steps 51 are adapted to the upper left corner and the lower right corner of the PTC heater 20, respectively.

[0072] Furthermore, when there are two sets of assembly positioning structures 50, the two sets of assembly positioning structures 50 can be divided into a first assembly structure and a second assembly structure. The limiting step 51 in the first assembly structure includes a first panel 51A and a second panel 51B. The limiting step 51 in the second assembly structure includes a third panel 51C and a fourth panel 51D. The first assembly structure and the second assembly structure located at the same corner can form a positional relationship in which the first panel 51A, the second panel 51B, the third panel 51C and the fourth panel 51D are connected in sequence. The first panel 51A is perpendicular to the second panel 51B, the second panel 51B is perpendicular to the third panel 51C, and the third panel 51C is perpendicular to the fourth panel 51D.

[0073] like Figures 4 to 7 As shown, in addition to the features of the above embodiments, this embodiment further specifies that: the air guide channel 101 is provided with not less than two sets of interference fit structures, the number of interference fit structures is the same as the number of assembly positioning structures 50, and the interference fit structures are used for the PTC heater 20 to interference fit the assembly positioning structure 50.

[0074] The interference fit structure enhances the fixing effect of the PTC heater 20 after the initial assembly of the PTC heater 20 by the assembly positioning structure 50. The number of interference fit structures can be no less than two sets, and the number of interference fit structures is the same as the number of assembly positioning structures 50, so that each set of interference fit structures corresponds to one set of assembly positioning structures 50. For example, both the number of interference fit structures and the number of assembly positioning structures 50 are two sets: a first interference fit structure, a second interference fit structure, a first assembly structure, and a second assembly structure. The first assembly structure is used for the initial assembly of the upper left corner of the PTC heater 20, and the second assembly structure is used for the initial assembly of the upper right corner of the PTC heater 20. The first interference fit structure forms an interference fit with the upper left corner of the PTC heater 20 in the horizontal or vertical direction, and the second interference fit structure forms an interference fit with the lower right corner of the PTC heater 20 in the horizontal or vertical direction.

[0075] like Figures 4 to 7 As shown, in addition to the features of the above embodiments, this embodiment further defines that: the interference fit structure includes at least one set of two limiting parts 61 distributed diagonally, the limiting parts 61 can undergo elastic deformation, and the limiting parts 61 are distributed on the assembly positioning structure 50.

[0076] The limiting part 61 can be elastically deformed. The limiting part 61 can be an elastic rib structure or a block structure. After the PTC heater 20 is initially assembled on the assembly positioning structure 50, the limiting part 61 on the corresponding limiting step 51 is interference-fitted with the PTC heater 20 to strengthen the fixing effect of the PTC heater 20 on the assembly positioning structure 50.

[0077] This embodiment provides a dishwasher, including the hot air device described above.

[0078] The above embodiments merely illustrate several implementation methods of this application, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A hot air device for use in a dishwasher, the dishwasher comprising an inner tub (200) and an outer shell (300), characterized in that, include: A duct housing (10) is sandwiched between the inner liner (200) and the outer shell (300). The duct housing (10) is provided with an air guide channel (101) and an air inlet (102) and an air outlet (103) communicating with the air guide channel (101). The air outlet (103) is communicating with the washing chamber in the inner liner (200). The air inlet (102) is distributed on the top of the duct housing (10), and the air inlet (102) is arranged opposite to at least one of the top plate, back plate or front plate of the outer shell (300). The PTC heater (20) and the fan assembly (30) are both mounted on the air duct housing (10). The fan assembly (30) is used to draw outside air from the air inlet (102) into the air guide channel (101) and deliver it to the washing chamber through the air outlet (103). The PTC heater (20) is used to heat the outside air in the air guide channel (101) to form hot air.

2. The hot air device according to claim 1, characterized in that, The air guide channel (101) is divided along its length into a sequentially connected air intake chamber (104), a heat exchange chamber (105), and an air supply chamber (106). The fan assembly (30) is distributed in the air intake chamber (104), the PTC heater (20) is distributed in the heat exchange chamber (105), the air inlet (102) is connected to the air intake chamber (104), and the air supply chamber (106) is connected to the washing chamber.

3. The hot air device according to claim 1, characterized in that, The number of air inlets (102) is not less than two, and the not less than two air inlets (102) are distributed at intervals on the top of the air duct housing (10); or, The number of air inlets (102) is one, and the air inlet (102) is positioned relative to the front plate, top plate and back plate of the outer shell (300).

4. The hot air device according to claim 1, characterized in that, The longitudinal section of the air duct shell (10) is L-shaped; And / or, The air duct housing (10) includes a first housing (12), a second housing (11), and an air duct connector (13). The first housing (12) and the second housing (11) are connected to form the air guide channel (101). The air duct connector (13) is connected to the first housing (12) and / or the second housing (11), and the air guide channel (101) is connected to the washing chamber through the air duct connector (13).

5. The hot air device according to claim 1, characterized in that, The air duct housing (10) is provided with a screw post (107) for fitting and installing with the ion generator (41); the air duct housing (10) is provided with an assembly hole (108) for inserting the generator probe (42) into the assembly hole (108) and extending into the air guide channel (101) or the channel between the air guide channel (101) and the washing chamber.

6. The hot air device according to any one of claims 1-5, characterized in that, The air guide channel (101) is provided with at least two sets of assembly positioning structures (50). Each set of assembly positioning structures (50) corresponds to a different size of the PTC heater (20) being assembled. One of the at least two sets of assembly positioning structures (50) is equipped with the PTC heater (20).

7. The hot air device according to claim 6, characterized in that, The assembly positioning structure (50) includes at least one set of two diagonally distributed limiting steps (51), the shape of which is adapted to the corner shape of the PTC heater (20).

8. The hot air device according to claim 7, characterized in that, The air guide channel (101) is also provided with no less than two sets of interference fit structures. The number of interference fit structures is the same as the number of assembly positioning structures (50). The interference fit structures are used for the PTC heater (20) to be interference fit with the assembly positioning structure (50).

9. The hot air device according to claim 8, characterized in that, The interference fit structure includes at least one set of two limiting parts (61) diagonally distributed, the limiting parts (61) being elastically deformable, and the limiting parts (61) being distributed on the assembly positioning structure (50).

10. A dishwasher, characterized in that, Includes the hot air device according to any one of claims 1-9 above.

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