Fan sealing sleeve and dishwasher

Abstract

The present invention discloses a fan sealing sleeve and a dishwasher, comprising a retaining ring and a sleeve nozzle, wherein the retaining ring is fixedly connected to the sleeve nozzle, the sealing sleeve and the side of the sleeve nozzle form a closed space, the fan is assembled in the closed space, and the air outlet of the fan is matched and fixed with the sleeve nozzle. The fan sealing sleeve of the present invention can tightly fit and cover the outer shell of the fan along the circumference and the air outlet, on the one hand, it is used to seal the fan and the fan cavity to prevent air leakage from the gap, and on the other hand, it separates the fan from the fan cavity to prevent the vibration of the fan from being transmitted to the fan cavity through the rigid connection and thus causing the whole machine to vibrate.

Description

Technical Field

[0001] The present invention relates to a sealing structure, in particular to a fan sealing sleeve and a dishwasher. Background Art

[0002] After washing, the dishwasher needs to quickly dry the moisture remaining on the dishes to reduce the growth of bacteria in the dishwasher cavity. In addition, there will be garbage left after washing. If the residual garbage is not handled in time, after a period of time, the humid environment inside the dishwasher will breed bacteria and produce odors, thereby contaminating the dishes and the surrounding environment, posing a threat to the health and dining safety of users. Drying and ventilation technology effectively solves this problem.

[0003] Whether drying or ventilating, a fan is typically installed at the dishwasher's air inlet or sealing opening to absorb and exhaust the moist air. However, due to the vibrations generated by the fan during operation and the rigid connection between the fan and the dishwasher, this vibration is easily transmitted, causing the entire dishwasher to vibrate and generate noise. Furthermore, prolonged operation in a humid environment can shorten the lifespan of the fan. Summary of the Invention

[0004] In order to solve the technical problem of noise generated by the vibration of the fan of the existing dishwasher, the present invention proposes a fan sealing sleeve that can solve the above problem.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A fan sealing sleeve comprises a retaining ring and a sleeve nozzle, wherein the retaining ring is fixedly connected to the sleeve nozzle, the retaining ring and the side of the sleeve nozzle form a closed space, the fan is assembled in the closed space, and the air outlet of the fan is matched and fixed with the sleeve nozzle.

[0007] Furthermore, the nozzle is a long cylindrical structure with a rectangular cross section, and the two ends of the retaining ring are respectively connected to the two opposite sides of the nozzle.

[0008] Furthermore, the bottom port of the mouthpiece is formed with a first outer flange folded outwards.

[0009] Furthermore, a second outer flange folded outward is formed on one end of the retaining ring facing the shell plate.

[0010] Furthermore, the plane where the sealing sleeve is located is perpendicular to the plane where the mouth of the nozzle is located.

[0011] Furthermore, at least one outwardly protruding protrusion is formed on the retaining ring along its axial direction, and a positioning column is formed on the protrusion.

[0012] Furthermore, a circle of bosses is formed on the positioning column.

[0013] Furthermore, there are two protrusions, which are symmetrically arranged on both sides of the retaining ring.

[0014] Furthermore, the fan sealing sleeve is made of any one of rubber, silicone, latex and plastic.

[0015] The present invention also proposes a dishwasher, including an inner tank and an exhaust duct, wherein a washing space is formed in the inner tank, an exhaust port is provided on the front panel of the inner tank, the exhaust duct is arranged on the front panel of the inner tank and is connected to the exhaust port, a fan is provided in the exhaust duct, the fan is connected to a controller, and the fan is assembled in the exhaust duct through a fan sealing sleeve described in any of the above items.

[0016] Compared with the prior art, the advantages and positive effects of the present invention are: the fan sealing sleeve of the present invention can tightly fit and cover the outer casing of the fan along the circumference and around the air outlet. On the one hand, it is used to seal the fan and the fan cavity to prevent air leakage from the gap; on the other hand, it separates the fan and the fan cavity to prevent the vibration of the fan from being transmitted to the fan cavity through rigid connection and causing vibration of the entire machine.

[0017] Other features and advantages of the present invention will become more apparent after reading the detailed description of the embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 2. It is a schematic structural diagram of an inner container of an embodiment of a dishwasher proposed by the present invention;

[0020] Figure 2 Schematic diagram of the assembly relationship between the exhaust duct and the inner container of an embodiment of the dishwasher proposed by the present invention;

[0021] Figure 3 Schematic diagram of the assembly relationship between the air inlet duct and the inner container of an embodiment of the dishwasher proposed by the present invention;

[0022] Figure 4 1 is a schematic diagram of the back panel of the inner tank of an embodiment of the dishwasher proposed by the present invention;

[0023] Figure 51 is a schematic diagram of a partial structure of an exhaust duct in an embodiment of a dishwasher proposed by the present invention;

[0024] Figure 6 yes Figure 5 A schematic diagram of one side structure of

[0025] Figure 7 yes Figure 6 B-direction sectional view;

[0026] Figure 8 yes Figure 5 Another side structural diagram;

[0027] Figure 9 This is an exploded view of the assembly relationship between the fan and the exhaust duct in one embodiment of the dishwasher proposed by the present invention;

[0028] Figure 10 yes Figure 9 Assembly drawing;

[0029] Figure 11 yes Figure 9 Schematic diagram of the local structure of the middle sealing sleeve;

[0030] Figure 12 yes Figure 10 Schematic diagram of the horizontal state. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] Example 1, see Figure 1 As shown, this embodiment will take a dishwasher with an exhaust duct as an example to explain in detail the working principle of the exhaust duct and the dishwasher. Figures 1-12 As shown, the dishwasher of this embodiment includes:

[0033] An inner tank 11 is provided with a washing space, an exhaust port 111 is provided on a front panel 110 of the inner tank 11, and an air inlet 113 is provided on a back panel 112 of the inner tank 11;

[0034] The air inlet duct 12 is provided on the back plate 112 of the inner liner 11 and communicates with the air inlet 113;

[0035] The exhaust duct 13 is provided on the front panel 110 of the inner liner 11 and is communicated with the exhaust port 111 . A fan 15 is provided in the exhaust duct 13 and is connected to a controller.

[0036] Among them, the controller is the controller of the dishwasher, which is used to control the dishwasher to complete water intake, washing, drainage, drying and other actions. It is set in the electronic control box of the dishwasher.

[0037] The dishwasher of this embodiment can be a drawer-type dishwasher or a sink-type dishwasher. A washing space is formed in the inner tank 11, and tableware such as bowls, plates, cups, and chopsticks can be placed in the inner tank for washing. By providing an air inlet and an air outlet on the inner tank and arranging a heating module in the air inlet, air circulation channels are formed on the rear outer side, the interior, and the front outer side of the inner tank. After washing, the fan is turned on to introduce external air into the inner tank, and the moisture on the surface of the tableware is taken away by the air flow to dry the tableware, which can solve the problem of water stains on the surface of the tableware that easily breed bacteria. By providing the air inlet on the back panel of the inner tank and the air outlet on the front panel of the inner tank, air can be taken in from the rear and discharged from the front. Since the dishwasher is generally installed in a cabinet with its rear facing the interior of the cabinet, by discharging air with higher humidity from the front of the dishwasher to the external space, moisture condensation in the cabinet is prevented, and the cabinet is prevented from being damp and shortening its service life.

[0038] A heating module 14 is also provided in the air inlet channel 12. The heating module 14 is connected to a controller (not shown in the figure). The heating module 14 is used to heat the air entering the inner tank to dry the tableware. When the drying function is not needed, the cavity heating module is not opened, and the fan is turned on to introduce natural wind, so that the air inside the washing tank can be exchanged with the fresh air outside in time, thereby reducing the generation of odor inside the cavity and realizing the ventilation function.

[0039] like Figure 2-Figure 5 As shown, the exhaust duct 13 is mounted on the outside of the front panel 110 and is used to guide air from the inner container to the outside. As a preferred embodiment, the exhaust duct 13 includes a shell plate 131 and further includes:

[0040] The air intake channel 132 is located inside the shell plate 131 and communicates with the exhaust port 111 of the inner container. The air intake channel 132 can be formed by a surrounding edge formed inside the shell plate 131 and the shell plate 131, or it can be an independent air duct structure fixed inside the shell plate 131, such as an air duct, and all of these fall within the scope of protection of the present invention. This embodiment uses the example of the air intake channel 132 being formed by a surrounding edge 132a formed inside the shell plate 131 and the shell plate 131. The surrounding edge 132a is sealed and fixed to the front panel 110.

[0041] In order to facilitate the fixing of the exhaust duct 13 on the front panel of the drawer 11, a convex rib 114 is formed on the front panel of the drawer 11, which matches the edge 132a of the exhaust duct 13. The fixed connection is achieved by aligning the edge 132a of the exhaust duct 13 with the convex rib 114 through bonding or welding.

[0042] The exhaust duct 133 is located at the lower end of the shell plate 131, and the air inlet of the exhaust duct 133 is connected to the air outlet of the fan 15; the exhaust duct 133 is set at the lower end of the shell plate 131, and the outlet of the exhaust duct 133 is downward, so that the wind is blown downward. On the one hand, the air outlet direction is toward the floor tiles to avoid direct blowing on the human body and causing discomfort. On the other hand, sufficient space can be reserved above the exhaust duct to arrange the fan cavity and the air inlet duct.

[0043] The fan cavity 134 is located inside the shell plate 131 and is formed between the air intake channel 132 and the air exhaust channel 133 . A fan 15 is provided in the fan cavity 134 , and an air inlet of the fan 15 is connected to an air outlet of the air intake channel 132 . When the fan 15 works to discharge the air in the inner tank 11 through the exhaust duct 13, the fan 15 first sucks away the air in the intake channel 132, and negative pressure is generated in the intake channel 132. Since the intake channel 132 is directly connected to the exhaust port 111 of the inner tank, the air in the inner tank is sucked into the intake channel 132 and then blown out from the exhaust channel 133 through the fan. The exhaust duct 13 in this solution is conducive to improving the compactness of the exhaust duct and reducing its occupied volume by providing the intake channel 132, the fan chamber 134 and the exhaust channel 133 connected in sequence. When used on a dishwasher, there is no limit on the volume of the dishwasher. It can be used in large commercial dishwashers and small household dishwashers, especially for small dishwashers with smaller space, which effectively solves the problem of limited function due to limited volume.

[0044] Since the air intake channel 132 is directly connected to the exhaust port 111 of the inner pot, the air in the inner pot 11 first passes through the air intake channel 132 when being discharged. The air humidity in the inner pot is relatively high and contains more water vapor. Preferably, the air intake channel 132 is composed of multiple connecting sections connected in sequence, and the multiple connecting sections are folded back at least once. By extending the air intake channel 132, on the one hand, water can be prevented from overflowing from the exhaust port 111 when washing dishes. On the other hand, the high-humidity air condenses to form water droplets when flowing through the air intake channel 132, and then flows back into the inner pot through the exhaust port 111 of the inner pot.

[0045] In order to extend the air intake channel 132 and enable the condensed water in the air intake channel 132 to be smoothly gathered and finally discharged into the inner tank 11, the air intake channel 132 includes a lower section 1321 and an upper section 1322, and the angle between the lower section 1321 and the upper section 1322 is acute angle The direction is toward the fan chamber 134, the lower side section 1321 is arranged in the horizontal direction, and the upper side section 1322 extends obliquely upward from the lower side section 1321. Alternatively, the lower side section 1321 is arranged obliquely upward from its starting end and then connects with the upper side section to form an acute angle. The condensed water in the upper side section 1322 and the lower side section 1321 flows downward along the channel under the action of gravity and finally flows into the inner tank.

[0046] In order to smoothly discharge the collected condensed water from the air intake channel 132 into the inner tank 11, Figure 7 As shown, the lower side edge 132a of the lower side section 1321 is preferably arranged to be tilted downward relative to the air flow channel corresponding to the lower side section 1321, and the gathered condensed water flows into the inner tank along the tilted downward edge 132a under the action of gravity.

[0047] The end of the surrounding edge 132a is folded downward to form a guide flange 132b. On the one hand, the guide flange 132b serves to guide the condensed water into the inner tank. On the other hand, it allows the surrounding edge 132a to fit tightly with the outer side of the inner tank to prevent the condensed water from flowing out of the gap to the outside of the inner tank.

[0048] An arc-shaped notch 132c is provided at the positive corner of the guide flange 132b. The arc-shaped notch 132c serves to gather condensed water and at the same time increases the slope of the end edge of the surrounding edge 132a. When the condensed water gathers at this point, it is quickly introduced into the inner tank.

[0049] like Figure 8 As shown, a wire clamp 135 is formed in the space enclosed by the lower side section 1321, the upper side section 1322 and the fan cavity 134 to clamp the wires of the fan 15. This makes rational use of space and prevents the wires from being cluttered and affecting assembly.

[0050] In order to save costs, the dishwasher in this solution preferably uses a low-cost fixed-frequency fan. Once a fixed-frequency fan is selected, the air volume cannot be flexibly adjusted according to the load. Figure 5 、 Figure 6 As shown, the fan cavity 134 is oriented toward the angle An air volume regulating port 1341 is provided on one side, and a windshield 1342 is provided at the air volume regulating port 1341. The windshield 1342 is slidably connected to the frame edge of the air volume regulating port 1341, and the fan chamber 134 is connected to the outside through the air volume regulating port 1341. When the exhaust duct 13 of this structure is used on dishwashers of different capacities, the opening of the air volume regulating port 1341 can be adjusted according to the actual load of the dishwasher to make the air outlet and air intake compatible. There is no need to re-open the mold or replace the fan, which improves its applicability and helps reduce production costs. The sliding connection between the windshield 1342 and the frame edge of the air volume regulating port 1341 facilitates the adjustment of the opening of the air volume regulating port 1341. Moreover, the sliding connection method can maintain the air volume regulating port well after adjustment, preventing arbitrary changes in the opening.

[0051] like Figure 5 As shown, guide slides 1343 are provided on the frame edges on both sides of the air volume regulating port 1341, and the wind shield 1342 is inserted into the guide slides 1343. The sliding direction of the wind shield 1342 is perpendicular to the shell plate 131, and the height of the wind shield 1342 relative to the shell plate 131 is not lower than the height of the surrounding edge that surrounds the fan cavity, that is, the wind shield 1342 can completely block the air volume regulating port 1341 when it slides to the bottom.

[0052] A connection port 1344 is provided between the upper section 1322 and the fan cavity 134 to connect the two channels. The upper end of the connection port 1344 is inclined toward the air intake channel 132 , which helps the condensed water flow back to the air intake channel 132 and prevents it from entering the fan cavity 134 .

[0053] like Figure 6 As shown, a check valve disc 136 is provided at the connection between the upper section 1322 and the fan chamber 134. The check valve disc 136 is used to unidirectionally conduct air between the suction channel 132 and the fan chamber 134. When the fan is working, the air pressure on the side of the check valve disc 136 facing the fan chamber 134 is low, and the air pressure on the side facing the suction channel 132 is high. Under the suction force of the fan 15, the check valve disc 136 rotates about its axis toward the fan chamber 134, connecting the suction channel 132 with the fan chamber 134. When the fan stops working, the check valve disc 136 remains in a drooping state under the action of gravity, blocking the fan chamber 134 from the suction channel 132. The check valve disc 136 can prevent air from entering the suction channel and then backflowing into the inner tank when the air pressure in the fan chamber 134 increases.

[0054] As a preferred embodiment, Figure 6As shown, one end of the check valve plate 136 is hingedly connected to the inner side of the retaining edge of the fan chamber, and a block 1345 is provided at the connection port 1344. The check valve plate 136 is located on the side of the block 1345 facing the fan chamber 134. Therefore, the check valve plate 136 can rotate unidirectionally around the axis toward the fan chamber, and is blocked by the block and cannot rotate around the axis toward the suction channel 132.

[0055] like Figure 6 As shown, the exhaust duct 133 is cylindrical with a through cavity inside. Its top port is connected to the air outlet of the fan 15, and the bottom port exhausts air outward. In order to reduce the noise of the air outlet, the setting direction of the exhaust duct 133 is consistent with the opening direction of the fan outlet to prevent the air duct from blocking the noise.

[0056] The fan 15 is located in the fan cavity 134. The air inlet of the fan 15 is connected to the air intake channel 132, and is used to suck the air in the inner container through the air intake channel 132. The air outlet of the fan 15 is connected to the exhaust channel 133, and is used to discharge the sucked air to the outside of the dishwasher. In order to improve the sealing performance of the fan 15 in the fan cavity 134, as shown in FIG. Figures 9-12 As shown, a sealing sleeve 16 is provided between the fan 15 and the fan cavity 134 .

[0057] like Figure 10-12 As shown, sealing sleeve 16 includes a retaining ring 161 and a nozzle 162. Retaining ring 161 is fixedly connected to nozzle 162. The sides of retaining ring 161 and nozzle 162 form a closed space. Fan 15 is assembled in this closed space, and the air outlet of fan 15 is aligned and fixed with nozzle 162. Retaining ring 161 is arranged along the circumference of fan 15, and nozzle 162 is set at the air outlet of the fan. Fan 15 does not directly contact fan chamber 134. Sealing sleeve 16 not only performs a sealing function, but also acts as a vibration damper, cushioning the vibration generated by the fan rotation and preventing it from being transmitted to the dishwasher and causing vibration of the entire dishwasher.

[0058] The nozzle 162 is set according to the shape of the air outlet of the fan 15. The nozzle 162 in this embodiment is a long cylindrical structure with a rectangular cross-section, one end of which is connected to the air outlet of the fan 15, and the other end is inserted into the exhaust channel 133 to achieve a sealed connection between the fan cavity 134 and the exhaust channel 133. The plane where the diameter direction of the retaining ring 161 is located is perpendicular to the plane where the mouth of the nozzle 162 is located. The two ends of the retaining ring 161 are respectively connected to the two opposite sides of the nozzle 162. Therefore, the retaining ring 161 and the two long sides of the upper end of the nozzle 162, as well as the two side edges, are transitionally connected to form a closed space. The main body of the fan 15 is arranged in the closed space.

[0059] The bottom end of the nozzle 162 is formed with a first outer flange 163 folded outward. When assembled, the bottom end of the nozzle 162 is inserted into the exhaust passage 133. Figure 10 As shown, the first outer flange 163 fits tightly against the inner wall of the exhaust channel 133, thereby achieving a seal between the air outlet of the fan 15 and the exhaust channel 133 to prevent air leakage to the outside. At the same time, the first outer flange 163 serves to isolate the fan 15 from the exhaust channel 133, thereby preventing the fan 15 from transmitting vibration to the exhaust channel 133.

[0060] There is a gap 1631 between two adjacent sides of the first outer flange 163. Figure 12 As shown, when the nozzle 162 is inserted into the exhaust channel 133, the surrounding walls of the exhaust channel 133 squeeze the first outer flange 163, the first outer flange 163 is tilted and deformed downward, and the gap 1631 is cracked, so that each side of the first flange 163 fits tightly with the surrounding side walls of the exhaust channel 133, achieving a complete sealing effect and preventing air leakage between the sealing sleeve and the exhaust channel 133.

[0061] Similarly, a second outer flange 164 folded outward is formed in the outer circumferential direction of the retaining ring 161 . The second outer flange 164 isolates the side of the fan 15 from the shell plate 131 to prevent the fan 15 from transmitting vibration to the shell plate 131 .

[0062] The second outer flange 164 is arranged along the outer circumferential direction of the retaining ring 161 and is located in the middle position of the outer circumference of the retaining ring 161. When the sealing sleeve is assembled on the exhaust duct 163, the retaining ring 161 is assembled in the fan cavity 134, and the retaining ring 161 partially extends outward from the shell plate 131. The second outer flange 164 and the inner side surface of the shell plate 131 are tightly fitted under the pressure of the fan 15. On the one hand, it prevents the fan 15 from transmitting vibration to the shell plate 131. On the other hand, it prevents air leakage from the fan cavity 134 and seals the fan 15 and the shell plate 131.

[0063] At least one outwardly protruding protrusion 165 is formed on the retaining ring 161 along its long axis direction, and a positioning column 166 is formed on the protrusion 165. The positioning column 166 serves to locate the assembly position of the sealing sleeve 16. A clamping portion 1346 is formed on the retaining edge of the fan chamber 134, and the positioning column 166 is inserted into the clamping socket of the clamping portion 1346.

[0064] The inner side of the protrusion 165 structure is hollow, forming a U-shaped groove structure with the opening facing the center direction of the retaining ring. When the sealing sleeve 16 is assembled between the fan 15 and the exhaust duct 13, the protrusion 165 provides a certain vibration space between the sealing sleeve 16 and the fan 15. When the fan 15 is working, it generates vibrations, which can vibrate slightly between the protrusion 165 and the fan 15 to consume the vibration energy of the fan 15. When the fan 15 vibrates, it deforms by compressing the protrusion 165, and some energy is released during the deformation process. Since the vibration energy has been consumed, it cannot be transmitted to the exhaust duct 13, thereby avoiding causing the exhaust duct 13 to vibrate together.

[0065] In order to simultaneously fix the sealing sleeve 16, a circle of bosses 1661 is formed on the positioning column 166, and a notch 1347 is opened on one side of the clamping portion 1346. The positioning column 166 is inserted into the bayonet from the notch 1347. The boss 1661 and the protrusion 165 are located below the clamping portion 1346, and the boss 1661 is located above the clamping portion 1346. The boss 1661 is stopped by the clamping portion 1346, which can prevent the positioning column 166 from being pulled out of the bayonet downward in the length direction of the positioning column.

[0066] The boss 1661 is a flat structure, and the length direction of the boss 1661 is perpendicular to the opening direction of the bayonet, which can limit the sealing sleeve in the vertical direction.

[0067] The boss 1661 can be integrally formed with the positioning post 166 to facilitate manufacturing.

[0068] Preferably, there are two protrusions 165 symmetrically arranged on both sides of the vertical center axis of the retaining ring 161 to prevent the retaining ring 161 from moving left and right, thereby improving the stability of the fixation.

[0069] The notches of the protrusions 165 are oriented toward the center of the retaining ring 161, and the two protrusions are located on the same straight line passing through the center of the retaining ring 161. This maximizes the absorption of the vibration energy of the fan in the direction of the straight line passing through the center of the retaining ring 161. Preferably, the two protrusions 165 are located on the left and right sides of the retaining ring 161, respectively, to reduce the left-right vibration of the fan.

[0070] An escape notch 1662 is provided at the upper end of the retaining ring 161. When the fan 15 needs to be removed from the exhaust duct 13, the circumferential side of the fan 15 can be accessed by holding the escape notch 1662 with hands, and the fan 15 can be removed very easily.

[0071] The sealing sleeve 16 can be made of any one of rubber, silicone, latex, and plastic, or other flexible, easily shaped, and airtight materials.

[0072] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention should also fall within the scope of protection of the present invention.

Claims

1. An exhaust duct for a dishwasher, characterized in that: The fan sealing sleeve is assembled in the exhaust air duct, and the fan sealing sleeve includes a retaining ring and a nozzle. The retaining ring is fixedly connected to the nozzle, and the retaining ring and the side of the nozzle form a closed space. The fan is assembled in the closed space. The fan is located in the fan cavity. The fan is not in direct contact with the fan cavity, and the air outlet of the fan is matched and fixed with the nozzle. The retaining ring is arranged along the circumferential direction of the fan, and the nozzle is arranged at the air outlet of the fan. One end of the nozzle is connected to the air outlet of the fan, and the other end is inserted into the exhaust duct. The fan sealing sleeve is made of any one of rubber, silicone, latex, and plastic.

2. The exhaust duct according to claim 1, characterized in that: The nozzle is a long cylindrical structure with a rectangular cross section, and the two ends of the retaining ring are respectively connected to the two opposite sides of the nozzle.

3. The exhaust duct according to claim 1, characterized in that: The bottom end of the mouthpiece is formed with a first outer turning edge folded outward.

4. The exhaust duct according to claim 1, characterized in that: The plane where the sealing sleeve is located is perpendicular to the plane where the mouth of the nozzle is located.

5. The exhaust duct according to any one of claims 1 to 4, characterized in that: At least one protrusion protruding outward is formed on the retaining ring along its axial direction, and a positioning column is formed on the protrusion.

6. The exhaust duct according to claim 5, characterized in that: A circle of bosses is formed on the positioning column.

7. The exhaust duct according to claim 5, characterized in that: The protrusions are two and are symmetrically arranged on both sides of the retaining ring.

8. A dishwasher, characterized in that: It comprises an inner tank and the exhaust duct according to any one of claims 1 to 7, wherein a washing space is formed in the inner tank, an exhaust port is provided on the front panel of the inner tank, the exhaust duct is arranged on the front panel of the inner tank and is connected with the exhaust port, a fan is arranged in the exhaust duct, the fan is connected to a controller, and the fan is assembled in the exhaust duct through the fan sealing sleeve.

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