A dishwasher and method of operation

Abstract

A dishwasher comprises a washing chamber having a washing cavity inside, a first exhaust duct having a first inlet and a first outlet, the first inlet being in communication with the washing cavity and the first outlet being in communication with the outside, an electrical chamber having an electrical cavity inside for mounting electrical components, a fan, and a second exhaust duct having a second inlet and a second outlet, the second inlet being in communication with the electrical cavity and the second outlet being arranged to extend into the first exhaust duct and to be in communication with a space inside the first exhaust duct, and the second outlet of the second exhaust duct being arranged upstream of the first outlet of the first exhaust duct along a flow direction of gas from the first inlet to the first outlet, the fan being arranged to drive a flow of gas from the first inlet to the first outlet and / or to drive a flow of gas from the second inlet to the second outlet. The invention also discloses a working method of the dishwasher. Compared with the prior art, the dishwasher can reduce the temperature of the exhaust hot gas.

Description

Technical Field

[0001] This invention belongs to the field of household appliance technology, specifically relating to a dishwasher and its working method. Background Technology

[0002] A dishwashing machine is a device that sprays cold or hot water onto dishes to remove dirt and clean them. The cleaning process consists of hot water rinsing followed by hot air drying.

[0003] The utility model patent "Water Tank Washing Machine" (authorization announcement number CN203693524U) with patent number ZL201320889945.4 discloses a solution that includes a box forming a washing space. The box includes a water tank body and a cover plate rotatably connected to the water tank body. The bottom of the water tank body has a recessed drainage area at least in the central part. A water pump is provided in the drainage area to pump water from the drainage area to the washing space above the drainage area. The drainage area is covered with a drainage plate with drainage holes. A rotating spray arm for pumping water out of the water pump is provided above the drainage plate. A heater is also provided in the drainage area to heat the water in the drainage area to achieve hot water washing.

[0004] For example, the utility model patent "A Cleaning Machine" (authorization announcement number CN216776967U) with patent number ZL202123010037.7 discloses a solution including a housing with a washing chamber inside and an exhaust port connected to the washing chamber; a heating element disposed on the bottom of the housing for heating the water at the bottom of the washing chamber; an air guide channel disposed on the outer wall of the housing with an air outlet connected to the washing chamber for introducing gas into the washing chamber; a fan with its air outlet connected to the air inlet of the air guide channel; and a heat-conducting element in contact with the heating element, partially located within the air guide channel for conducting heat from the heating element to the air guide channel. The heat from the heating element is transferred to the air guide channel by the heat-conducting component. When the fan guides the air into the air guide channel, it exchanges heat with the heat-conducting component in the air guide channel. The higher temperature air enters the washing chamber and dries the items to be washed in the washing chamber quickly, thus improving the drying efficiency.

[0005] Current dishwashers with hot air drying technology directly blow hot air into the dishwasher cavity and exhaust the hot, humid air through the vent. Directly expelling hot, humid air can burn users, and it also condenses on the machine's exterior, producing condensation. Furthermore, the hot, humid air inside the cavity can enter the electrical chamber at the bottom of the dishwasher through the overflow drain. This electrical chamber houses electrical components, and the hot, humid air can corrode these components, reducing their reliability. Summary of the Invention

[0006] The first technical problem to be solved by the present invention is to provide a dishwasher that can reduce the temperature of the exhaust hot air, in light of the current state of the prior art.

[0007] The second technical problem to be solved by the present invention is to provide a method for operating the above-mentioned dishwasher, so as to improve washing efficiency while reducing the temperature of the exhaust hot air.

[0008] The technical solution adopted by the present invention to solve the first technical problem mentioned above is: a dishwasher, comprising:

[0009] The washing chamber contains a washing cavity.

[0010] The first exhaust pipe has a first inlet and a first outlet, with the first inlet connected to the washing chamber and the first outlet connected to the outside.

[0011] An electrical chamber, which contains an electrical cavity for installing electrical components;

[0012] Fan;

[0013] Its characteristic is that it also includes:

[0014] The second exhaust pipe has a second inlet and a second outlet, and the second inlet is connected to the electrical cavity. The end where the second outlet is located extends into the first exhaust pipe and is connected to the space inside the first exhaust pipe. Along the flow direction of gas from the first inlet to the first outlet, the second outlet of the second exhaust pipe is located upstream of the first outlet of the first exhaust pipe.

[0015] The fan is arranged to drive airflow from a first inlet to a first outlet, or / and to drive airflow from a second inlet to a second outlet.

[0016] In this way, the hot air in the washing chamber can enter the first exhaust pipe, mix with the airflow output from the second exhaust pipe, and then be discharged to the outside. The temperature of the mixed airflow is reduced, thereby reducing the temperature of the discharged hot air. Furthermore, the airflow output from the second exhaust pipe can dissipate heat from the electrical chamber, improving the lifespan of the electrical components.

[0017] Preferably, the electrical chamber is equipped with a heating element, which acts on the washing chamber;

[0018] The end of the second exhaust pipe where the second inlet is located extends into the electrical chamber and is opposite to the heating element.

[0019] In this way, the heat generated by the heating element inside the electrical cavity can be dissipated.

[0020] Preferably, the heating element is in the shape of a coil, with its first coil facing the washing chamber and its second coil facing the second inlet of the second exhaust pipe. This allows the heating element to heat the washing chamber normally without affecting its heat dissipation.

[0021] To improve the washing efficiency of the dishwasher, preferably, the first exhaust pipe is provided with a valve, which has a first state of opening the first exhaust pipe and a second state of cutting off the passage in the first exhaust pipe. In the second state, the passage in the first exhaust pipe is divided into an upstream passage where the first inlet is located and a downstream passage where the first outlet is located, and the second exhaust pipe is connected to the upstream passage.

[0022] The fan is arranged to drive the airflow in the electrical chamber through the second exhaust pipe and the upstream passage in sequence before entering the washing chamber through the first inlet.

[0023] In this way, during the washing process, the heat generated in the electrical chamber can be transferred to the washing chamber, improving the washing effect.

[0024] Furthermore, the valve includes a valve plate rotatably disposed within the first exhaust pipe at a position corresponding to the second outlet. In the first state, the surface of the valve plate is spaced apart from the second outlet to form a gap, which connects the second outlet and the first outlet. In the second state, the valve plate is horizontally blocked within the first exhaust pipe and is located downstream of the second outlet along the gas flow direction from the first inlet to the first outlet.

[0025] Preferably, the flow area of ​​the first outlet is smaller than the flow area of ​​the gap.

[0026] Preferably, the first exhaust pipe extends substantially horizontally, and the second outlet of the second exhaust pipe extends upward and penetrates the bottom wall of the first exhaust pipe.

[0027] The aforementioned valve plate can be rotated by a drive mechanism. To achieve switching between the first and second states without requiring a separate drive mechanism, preferably, the valve plate is positioned above the second outlet, capable of rotating up and down around a horizontally extending first axis, with the first axis located in the middle of the valve plate. The valve plate has a first edge and a second edge located on either side of the first axis. The valve plate always tends to rotate downwards at the first edge and upwards at the second edge to a substantially horizontal position, forming the first state. Simultaneously, under the influence of the upward-flowing airflow at the second outlet, the first edge of the valve plate is arranged to rotate upwards, placing the valve plate in the second state. Thus, when airflow is output from the second exhaust pipe, the airflow drives the valve plate to rotate to the second state. At this time, the passage in the first exhaust pipe is cut off by the valve plate, and the airflow output from the second exhaust pipe enters the washing chamber through the upstream passage of the first exhaust pipe, heating the washing chamber.

[0028] Preferably, a counterweight is provided at the first edge of the valve plate, which causes the first edge of the valve plate to always have a downward rotation tendency. Alternatively, an elastic element (such as a torsion spring) can also be used to ensure that the first edge of the valve plate always has a downward rotation tendency.

[0029] Preferably, the sidewall of the first exhaust pipe is provided with a lower limit component and an upper limit component located above the lower limit component. In the first state, the lower limit component acts on the valve plate to prevent the first edge of the valve plate from rotating further downward; in the second state, the upper limit component acts on the valve plate to prevent the first edge of the valve plate from rotating further upward.

[0030] Preferably, the valve plate has a first limiting protrusion at the end of its first edge, and the side wall of the first exhaust pipe has a first arc-shaped groove that curves from top to bottom. The center of the first arc-shaped groove is located on the first axis of the valve plate, so that the first limiting protrusion can be inserted into it and rotate along it. In the first state, the first limiting protrusion is located at the lower end of the first arc-shaped groove, that is, the lower end of the first arc-shaped groove is the aforementioned lower limiting component. In the second state, the first limiting protrusion is located at the upper end of the first arc-shaped groove, that is, the upper end of the first arc-shaped groove is the aforementioned upper limiting component.

[0031] In the above scheme, to ensure that the valve plate's arrangement does not affect the discharge of hot air from the washing chamber, preferably, the first exhaust pipe is also equipped with a movable limiting member. This limiting member, under external force, can move above the valve plate to prevent it from rotating from the first state to the second state, and can also move outside the valve plate's rotation path. Thus, when it is necessary to discharge hot air from the washing chamber, the limiting member can move above the valve plate to prevent it from rotating to the second state. At this time, the airflow from the electrical chamber and the washing chamber can mix and be discharged within the first exhaust pipe.

[0032] The aforementioned limiting member can be moved by a driving mechanism. To achieve the movement of the limiting member without the need for a separate driving mechanism, preferably, the limiting member is a vertically extending limiting plate. This limiting plate is disposed within the first exhaust pipe in a manner rotatable about a second vertically extending axis, and is arranged so that it can rotate outside the rotation path of the valve plate under the action of airflow from the first outlet to the first inlet within the first exhaust pipe, and can also rotate above the valve plate under the action of airflow from the first inlet to the first outlet within the first exhaust pipe. Thus, when the washing chamber needs to exhaust hot air, the fan first drives the hot air in the washing chamber to be discharged from the first exhaust pipe. At this time, the limiting plate can rotate above the valve plate under the action of the hot air, preventing the valve plate from rotating from the first state to the second state. Then, the airflow in the electrical chamber enters the first exhaust pipe through the second exhaust pipe, mixes with the hot air in the first exhaust pipe, and is discharged. When the washing stage requires further heating of the washing chamber, the fan can first drive the airflow in the electrical chamber to enter the first exhaust pipe through the second exhaust pipe. Since the flow area of ​​the first outlet is smaller than the flow area of ​​the gap, some airflow will flow along the direction from the first outlet to the first inlet, causing the limiting plate to rotate outside the rotation path of the valve plate. At this time, the valve plate is no longer constrained by the limiting plate, and the valve plate can rotate to the second state under the action of the airflow in the second exhaust pipe, thereby realizing the flow of air from the electrical chamber to the washing chamber.

[0033] Preferably, the top of the limiting piece is provided with a second limiting protrusion, and the top wall of the first exhaust pipe is provided with a second arc-shaped groove. The center of the second arc-shaped groove is located on the second axis of the limiting piece, so that the second limiting protrusion can be inserted into it and rotate along it.

[0034] In the above embodiments, preferably, the first outlet of the first exhaust pipe is located on the front side wall of the washing chamber and is arranged facing forward.

[0035] Preferably, there are at least two fans, respectively located in the first exhaust pipe and the second exhaust pipe. Alternatively, there may be only one fan, which drives airflow from the first inlet to the first outlet of the first exhaust pipe, and when the airflow in the first exhaust pipe flows rapidly, it can draw air from the second exhaust pipe. Conversely, the fan can also drive airflow from the second inlet to the second outlet of the second exhaust pipe, and when the airflow in the second exhaust pipe flows rapidly, it can draw air from the first exhaust pipe.

[0036] The technical solution adopted by the present invention to solve the second technical problem mentioned above is: a working method of a dishwasher as described above, characterized in that:

[0037] When the dishwasher is in the washing state, the heating element is heated and the valve is in the second state. At this time, the fan drives the hot air in the electrical chamber to enter the washing chamber through the second exhaust pipe, the upstream passage of the first exhaust pipe, and then through the first inlet.

[0038] When the washing cycle is complete and the dishwasher is in the heat dissipation state, the heating element stops heating and the valve is in the first state. At this time, the fan drives the cold air in the electrical chamber to enter the first exhaust pipe through the second exhaust pipe, and drives the hot air in the washing chamber to enter the first exhaust pipe. After mixing with the cold air from the electrical chamber, the hot air is discharged to the outside through the first outlet.

[0039] Compared with the prior art, the advantages of the present invention are as follows: by adding a second exhaust pipe that connects the electrical chamber and the first exhaust pipe, the hot air in the washing chamber can enter the first exhaust pipe, mix with the airflow output from the second exhaust pipe and then be discharged to the outside. The temperature of the mixed airflow is reduced, thereby reducing the temperature of the discharged hot air; and the airflow output from the second exhaust pipe can dissipate heat from the electrical chamber, improving the lifespan of the electrical components. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention;

[0041] Figure 2 This is a cross-sectional view of an embodiment of the present invention;

[0042] Figure 3 This is a longitudinal sectional view of a partial structure of an embodiment of the present invention (the valve is in the first state, and the limiting plate is located on the valve and abuts against the valve from the top and bottom).

[0043] Figure 4 This is a longitudinal sectional view of a partial structure of an embodiment of the present invention (the valve is in the second state, and the limiting plate is located outside the rotation path of the valve);

[0044] Figure 5 This is a longitudinal sectional view of a partial structure of an embodiment of the present invention (the valve is in the first state, and the limiting plate is located outside the rotation path of the valve);

[0045] Figure 6 This is a longitudinal sectional view of a partial structure of an embodiment of the present invention (valve and limiting plate omitted);

[0046] Figure 7 This is a schematic diagram of the structure of the limiting piece in an embodiment of the present invention;

[0047] Figure 8 This is a schematic diagram of the valve structure in an embodiment of the present invention. Detailed Implementation

[0048] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0049] like Figures 1-8 As shown, this is a preferred embodiment of a dishwasher and its working method according to the present invention. The dishwasher includes a washing chamber 1, a first exhaust pipe 2, an electrical chamber 3, a fan 4, and a second exhaust pipe 5.

[0050] The washing chamber 1 contains a washing chamber 10.

[0051] The first exhaust pipe 2 extends horizontally and has a first inlet 2a and a first outlet 2b. The first inlet 2a is connected to the washing chamber 10, and the first outlet 2b is located on the front side wall of the washing chamber 1, facing forward and connected to the outside.

[0052] The aforementioned electrical chamber 3 is located below the washing chamber 1 and has an electrical cavity 30 inside for installing electrical components. The top wall of the electrical cavity 30 is the bottom wall of the washing chamber and is equipped with a heating element 31. The heating element 31 is in the shape of a tube disc, with its upper disc surface facing the washing chamber 10 and its lower disc surface facing the electrical cavity 30.

[0053] The aforementioned second exhaust pipe 5 has a second inlet 5a and a second outlet 5b. The second inlet 5a is connected to the electrical cavity 30 and is opposite to the lower plate surface of the heating element 31. The end where the second outlet 5b is located extends upward and penetrates the bottom wall of the first exhaust pipe 2, thereby connecting with the space inside the first exhaust pipe 2. Along the flow direction of gas from the first inlet 2a to the first outlet 2b, the second outlet 5b of the second exhaust pipe 5 is located upstream of the first outlet 2b of the first exhaust pipe 2.

[0054] There are two fans 4, which are respectively installed in the first exhaust pipe 2 and the second exhaust pipe 5. The fan 4 installed in the first exhaust pipe 2 is used to drive the airflow from the first inlet 2a to the first outlet 2b, and the fan 4 installed in the second exhaust pipe 5 is used to drive the airflow from the second inlet 5a to the second outlet 5b.

[0055] At the same time, such as Figures 3-8As shown, a valve 6 is provided inside the first exhaust pipe 2. The valve 6 includes a valve plate 61, which is mounted above the second outlet 5b and can rotate up and down around a horizontally extending first axis (the first axis is located in the middle of the valve plate 61). The valve plate 61 has a first edge 611 and a second edge 612 located on both sides of the first axis. A counterweight 62 is provided at the first edge 611. The counterweight 62 makes the valve plate 61 tend to rotate downward with the first edge 611 and upward with the second edge 612 until the valve plate 61 is basically horizontal. In the first state, the first exhaust pipe 2 is open, and the lower surface of the valve plate 61 and the second outlet 5b are spaced apart to form a gap 60. The gap 60 connects the second outlet 5b and the first outlet 2b, and the flow area of ​​the gap 60 is larger than the flow area of ​​the first outlet 2b. Meanwhile, under the action of the upward airflow at the second outlet 5b, the first edge 611 of the valve plate 61 is arranged to rotate upward so that the valve plate 61 is in the second state. In the second state, the valve plate 61 is blocked in the first exhaust pipe 2 and cuts off the passage in the first exhaust pipe 2. In the second state, along the flow direction of gas from the first inlet 2a to the first outlet 2b, the valve plate 61 is located downstream of the second outlet 5b. The passage in the first exhaust pipe 2 is divided into the upstream passage 21 where the first inlet 2a is located and the downstream passage 22 where the first outlet 2b is located. The second exhaust pipe 5 is connected to the upstream passage 21.

[0056] To limit the rotation angle of the valve plate 61, a first limiting protrusion 613 is provided at the end of the first edge 611 of the valve plate 61, and a first arc-shaped groove 23 is provided on the side wall of the first exhaust pipe 2, which curves from top to bottom. The center of the first arc-shaped groove 23 is located on the first axis of the valve plate 61, so that the first limiting protrusion 613 can be inserted into it and rotate along it. In the first state, the first limiting protrusion 613 is located at the lower end of the first arc-shaped groove 23 and cannot rotate further downward. In the second state, the first limiting protrusion 613 is located at the upper end of the first arc-shaped groove 23 and cannot rotate further upward.

[0057] Meanwhile, a movable limiting member is also provided inside the first exhaust pipe 2. Under the action of external force, the limiting member can move to above the valve plate 61 to prevent the valve plate 61 from rotating from the first state to the second state, and can also move outside the rotation path of the valve plate 61. In this embodiment, the limiting member is a vertically extending limiting piece 7. The limiting piece 7 is disposed inside the first exhaust pipe 2 in a manner that allows it to rotate around a vertically extending second axis, and is arranged so that it can rotate outside the rotation path of the valve plate 61 under the action of the airflow from the first outlet 2b to the first inlet 2a inside the first exhaust pipe 2, and can also rotate above the valve plate 61 under the action of the airflow from the first inlet 2a to the first outlet 2b inside the first exhaust pipe 2.

[0058] In order to limit the rotation angle of the limiting plate 7, the top of the limiting plate 7 is provided with a second limiting protrusion 71, and the top wall of the first exhaust pipe 2 is provided with a second arc-shaped groove 24. The center of the second arc-shaped groove 24 is located on the second axis of the limiting plate 7, so that the second limiting protrusion 71 can be inserted into it and rotate along it.

[0059] The dishwasher in this embodiment operates as follows:

[0060] When the dishwasher is in the washing state, the heating element 31 heats up, and the fan in the second exhaust pipe 5 operates, driving the hot air in the electrical chamber 3 into the second exhaust pipe 5. The hot air then flows through the gap 60 to the first outlet 2b of the first exhaust pipe 2. Because the flow area of ​​the gap 60 is larger than the flow area of ​​the first outlet 2b, some of the hot air flows along the direction from the first outlet 2b to the first inlet 2a, causing the limiting plate 7 to rotate outside the rotation path of the valve plate 61. Figure 5 As shown, at this time, the valve plate 61 is no longer constrained by the limiting plate 7, and the valve plate 61 can rotate to the second state under the action of the airflow in the second exhaust pipe 5, as shown. Figure 4 As shown, this allows hot air from the electrical chamber to flow into the washing chamber 1, further heating the washing chamber 1 to improve washing efficiency, while simultaneously expelling hot air from the electrical chamber 3 to extend the electrical lifespan.

[0061] After the wash cycle is complete and the dishwasher is in the drying and heat dissipation state, the heating element 31 stops heating, and the fan in the second exhaust pipe 5 stops working. Figure 5 As shown, valve plate 61 is reset to the first state under the action of counterweight 62. Then, the fan in the first exhaust pipe 2 operates, driving the hot air in the washing chamber 1 into the first exhaust pipe 2 and flowing towards the first outlet 2b. At this time, as... Figure 3 As shown, under the action of hot air, the limiting plate 7 rotates above the valve plate 61, preventing the valve plate from rotating from the first state to the second state. Then, the fan in the second exhaust pipe 5 starts to work, driving the cold air in the electrical chamber 3 to enter the first exhaust pipe 2 through the second exhaust pipe 5. After mixing with the hot air in the first exhaust pipe 2, it is discharged to the outside from the first outlet 2b. In this embodiment, the first outlet 2b extends upward and forward at an angle. The airflow velocity in the second exhaust pipe 5 is relatively fast, and according to Bernoulli's principle, the airflow from the gap 60 to the first outlet 2b will also carry away the hot air in the first exhaust pipe 2 simultaneously and quickly, increasing the exhaust speed of the first exhaust pipe 2 and reducing the drying time.

[0062] At the end of the drying stage, the valve plate 61 and the limiting plate 7 are in the following state: Figure 3 As shown, wait for the next washing cycle to begin.

Claims

1. A dishwasher comprising: a washing chamber (1) having a washing cavity (10) inside; a first exhaust duct (2) having a first inlet (2a) and a first outlet (2b), the first inlet (2a) being in communication with the washing cavity (10), and the first outlet (2b) being in communication with the outside; an electrical chamber (3) having an electrical cavity (30) inside for mounting electrical components; a fan (4); characterized in that and further comprising: a second exhaust duct (5) having a second inlet (5a) and a second outlet (5b), the second inlet (5a) being in communication with the electrical cavity (30), and the second outlet (5b) extending into the first exhaust duct (2) and being in communication with a space inside the first exhaust duct (2), and the second outlet (5b) of the second exhaust duct (5) being located upstream of the first outlet (2b) of the first exhaust duct (2) along a flow direction of gas from the first inlet (2a) to the first outlet (2b); the fan (4) being arranged to drive a flow of gas from the first inlet (2a) to the first outlet (2b), or / and to drive a flow of gas from the second inlet (5a) to the second outlet (5b); the electrical chamber (3) being provided with a heating component (31) acting on the washing chamber (1); the second inlet (5a) of the second exhaust duct (5) extending into the electrical chamber (3) and being opposite to the heating component (31); the first exhaust duct (2) being provided with a valve (6) having a first state in which the first exhaust duct (2) is open, and a second state in which a passage inside the first exhaust duct (2) is cut off, and in the second state, the passage inside the first exhaust duct (2) is divided into an upstream passage (21) upstream of the first inlet (2a) and a downstream passage (22) downstream of the first outlet (2b), and the second exhaust duct (5) being in communication with the upstream passage (21); the fan (4) being arranged to drive a flow of gas in the electrical chamber (3) to pass through the second exhaust duct (5) and the upstream passage (21) in sequence, and then enter the washing cavity (10) from the first inlet (2a).

2. The dishwasher according to claim 1, characterized in that: the heating component (31) being in the form of a tube disc, a first disc surface of the tube disc being opposite to the washing cavity (10), and a second disc surface of the tube disc being opposite to the second inlet (5a) of the second exhaust duct (5).

3. The warewashing machine of claim 1, wherein: the valve (6) comprising a valve plate (61) rotatably arranged in the first exhaust duct (2) at a position corresponding to the second outlet (5b), in the first state, a surface of the valve plate (61) being opposite to the second outlet (5b) with a gap (60) formed therebetween, the gap (60) being in communication with the second outlet (5b) and the first outlet (2b), and in the second state, the valve plate (61) being arranged across the first exhaust duct (2), and along the flow direction of gas from the first inlet (2a) to the first outlet (2b), the valve plate (61) being located downstream of the second outlet (5b).

4. The warewash machine of claim 3, further characterized by: a flow area of the first outlet (2b) being smaller than a flow area of the gap (60).

5. The warewash machine of claim 3 wherein: The first exhaust duct (2) extends horizontally, and the second outlet (5b) of the second exhaust duct (5) extends upward and penetrates the bottom wall of the first exhaust duct (2).

6. The warewash machine of claim 5, further comprising: The valve piece (61) is arranged above the second outlet (5b) and can be flipped up and down about a horizontal first axis, and the first axis is located in the middle of the valve piece (61), and the valve piece (61) has a first edge (611) and a second edge (612) located on both sides of the first axis, and the valve piece (61) always has a tendency to turn the first edge (611) downward and the second edge (612) upward to a first state in which the valve piece (61) is substantially horizontal; meanwhile, under the action of the airflow flowing upward at the second outlet (5b), the first edge (611) of the valve piece (61) is arranged to be able to turn upward so that the valve piece (61) is in a second state.

7. The warewash machine of claim 6, further comprising: A counterweight (62) is arranged at the first edge (611) of the valve piece (61), which makes the first edge (611) of the valve piece (61) always have a tendency to turn downward. 8.The dish washer of claim 6, wherein: The side wall of the first exhaust duct (2) is provided with a lower limiting component and an upper limiting component located above the lower limiting component, and in the first state, the lower limiting component acts on the valve piece (61) to block the first edge (611) of the valve piece (61) from turning downward further; in the second state, the upper limiting component acts on the valve piece (61) to block the first edge (611) of the valve piece (61) from turning upward further.

9. The warewash machine of claim 8, further comprising: The end of the first edge (611) of the valve piece (61) is provided with a first limiting protrusion (613), and the side wall of the first exhaust duct (2) is provided with a first arc-shaped groove (23) curved from top to bottom, and the center of the first arc-shaped groove (23) is located on the first axis of the valve piece (61), so that the first limiting protrusion (613) is inserted therein and rotates along it, and in the first state, the first limiting protrusion (613) is located at the lower end of the first arc-shaped groove (23), that is, the lower end of the first arc-shaped groove (23) is the lower limiting component; in the second state, the first limiting protrusion (613) is located at the upper end of the first arc-shaped groove (23), that is, the upper end of the first arc-shaped groove (23) is the upper limiting component. 10.The dish washer of claim 6, wherein: The first exhaust duct (2) is further provided with a movable limiting piece, which can be moved to the upper side of the valve piece (61) under the action of an external force to block the valve piece (61) from turning from the first state to the second state, and can be moved to the outside of the turning path of the valve piece (61).

11. The warewash machine of claim 10, further comprising: The limiting piece is a limiting piece (7) extending upward and downward, which is arranged in the first exhaust duct (2) in a manner that can rotate about a second axis extending upward and downward, and is arranged to be able to rotate to the outside of the turning path of the valve piece (61) under the action of the airflow in the first exhaust duct (2) from the first outlet (2b) to the first inlet (2a), and to the upper side of the valve piece (61) under the action of the airflow in the first exhaust duct (2) from the first inlet (2a) to the first outlet (2b).

12. The warewash machine of claim 11, further comprising: The top end of the limiting sheet (7) is provided with a second limiting block (71), and the top wall of the first exhaust duct (2) is provided with a second arc-shaped slot (24) with a center located on the second axis of the limiting sheet (7) for the second limiting block (71) to be inserted and rotated.

13. The dishwasher according to any one of claims 1 to 12, characterized in that: The first outlet (2b) of the first exhaust duct (2) is located on the front side wall of the washing chamber (1) and is arranged towards the front.

14. The dishwasher according to any one of claims 1 to 12, characterized in that: The fan (4) is at least two and is arranged in the first exhaust duct (2) and the second exhaust duct (5) respectively.

15. A working method of the dishwasher as claimed in any one of claims 4-12, characterized in that: When the dishwasher is in the washing state, the heating element (31) is heated, the valve (6) is in the second state, at this time, the fan (4) drives the hot air in the electrical chamber (3) to pass through the second exhaust duct (5) and the upstream passage (21) of the first exhaust duct (2) and then enter the washing chamber (10) from the first inlet (2a); When the dishwasher is in the heat dissipation state after the washing is completed, the heating element (31) stops heating, the valve (6) is in the first state, at this time, the fan (4) drives the cold air in the electrical chamber (3) to pass through the second exhaust duct (5) and enter the first exhaust duct (2), and drives the hot air in the washing chamber (10) to enter the first exhaust duct (2), and after being mixed with the cold air from the electrical chamber (3), is discharged to the outside from the first outlet (2b).

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