Air duct assembly for cleaning machine and cleaning machine

Abstract

The utility model belongs to the technical field of electric appliances, and discloses an air duct assembly for a cleaning machine and the cleaning machine. The air duct assembly comprises a shell and an air supply module, a first air duct and a second air duct which are mutually independent are arranged in the shell, and the shell is provided with an extraction opening, an air supply opening and an air overflow opening; the first air duct is communicated between the air outlet and the air supply port of the air supply module, the first air duct is provided with an injection section used for accelerating flowing of air flow, and the injection section is arranged close to the air extraction port so that negative pressure allowing the air flow in the inner container to enter the first air duct can be formed at the air extraction port; the second air duct is communicated between the air outlet end of the air supply module and the air supply port, a heating unit is arranged in the second air duct to heat airflow flowing through the second air duct, and the air overflow port is communicated with the first air duct and / or the second air duct. According to the air duct assembly and the cleaning machine, the drying efficiency of objects in the inner container can be improved, the probability of air overflowing in the inner container is reduced, and the use safety and reliability of the air duct assembly and the cleaning machine are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical appliances, and in particular to an air duct component for a cleaning machine and the cleaning machine. Background Art

[0002] In devices such as dishwashers that can clean and dry tableware or other items, a large amount of hot and humid airflow will be generated in the inner tank during the drying process. If the hot and humid airflow cannot be discharged in time, it will affect the drying efficiency.

[0003] The prior art provides an air duct assembly used in a dishwasher, wherein an air duct and an air supply fan are arranged inside the air duct, the air duct having an air suction port, an air inlet end and an air inlet port, the air supply fan guides the hot and humid airflow in the inner tank into the air duct, and simultaneously guides the external dry airflow into the air duct to mix with the hot and humid airflow, thereby forming a mixed airflow with lower humidity, and the mixed airflow enters the inner tank again through the air inlet end.

[0004] The air duct assembly provided by the prior art can reuse the heat of the hot and humid airflow and use external airflow to reduce the humidity in the inner tank. However, the external dry airflow is easily added to the inner tank, which can increase the internal pressure of the inner tank and cause air overflow. Long-term moisture overflow will cause mildew spots to appear in some areas of the dishwasher cabinet, affecting the cleanliness of the dishwasher environment and is not conducive to the long-term use of the dishwasher. Utility Model Content

[0005] The utility model aims to provide an air duct assembly of a cleaning machine and a cleaning machine, so as to reduce the humidity of the air flow inside the inner tank through the air duct while avoiding excessive air pressure inside the air duct assembly and the inner tank, thereby improving the safety of the air duct assembly and the cleaning machine and improving the drying efficiency.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] An air duct assembly for a cleaning machine, the cleaning machine having an inner liner, the air duct assembly comprising a shell and an air supply module, the shell having a first air duct and a second air duct independent of each other, and the shell having an air suction port for the inner liner airflow to flow into, an air supply port for the airflow to be delivered to the inner liner, and an air overflow port;

[0008] The air inlet end of the first air duct is communicated with the air outlet of the air supply module, the air outlet end of the first air duct is communicated with the air supply port, the first air duct has an ejection section for accelerating the flow of air, the ejection section is arranged adjacent to the air extraction port, so that a negative pressure is formed at the air extraction port for the air flow in the inner tank to enter the first air duct;

[0009] The air inlet end of the second air duct is connected to the air outlet end of the air supply module, the air outlet end of the second air duct is connected to the air supply port, a heating unit is arranged inside the second air duct to heat the airflow passing through the second air duct, and the overflow port is connected to the first air duct and / or the second air duct.

[0010] As an optional technical solution of an air duct assembly, the air inlet end of the ejection section forms the air inlet end of the first air duct, and the flow area of ​​the ejection section gradually increases in the direction toward the air outlet end of the air supply module;

[0011] And / or, the first air duct includes a mixing section, the mixing section is connected between the air outlet end and the air supply port of the ejection section, the minimum flow area of ​​the ejection section is smaller than the flow area of ​​the mixing section, and the air exhaust port is airflow-connected with the air inlet end of the mixing section.

[0012] As an optional technical solution of an air duct component, the air inlet end of the mixing section has a primary mixing section, the flow area of ​​the primary mixing section gradually decreases in a direction away from the ejection section, and the air suction port is connected to the air inlet end of the primary mixing section;

[0013] And / or, the mixing section includes a flared section arranged in a trumpet shape, and the flow area of ​​the flared section gradually increases in a direction away from the ejection section.

[0014] As an optional technical solution for an air duct component, the first air duct includes a pressure stabilizing chamber, the pressure stabilizing chamber is connected to the air outlet end of the mixing section, the air supply port is arranged on the side of the pressure stabilizing chamber away from the mixing section, the flow area of ​​the pressure stabilizing chamber is larger than the maximum flow area of ​​the mixing section, and the overflow port is arranged on one side wall of the pressure stabilizing chamber.

[0015] As an optional technical solution of the air duct component, the air inlet end of the pressure stabilizing chamber is provided with a drainage structure, and the drainage structure guides the mixed airflow entering the pressure stabilizing chamber to flow in a direction away from the overflow port and the air supply port;

[0016] And / or, a flow blocking structure is provided between the overflow port and the air supply port, one end of the flow blocking structure is connected to the side cavity wall where the overflow port is located, and the other end of the flow blocking structure extends in a direction toward the inside of the pressure stabilizing cavity.

[0017] As an optional technical solution for an air duct component, the pressure-stabilizing chamber has a first chamber wall and a second chamber wall that are arranged opposite to and at intervals, an air inlet end of the pressure-stabilizing chamber is formed between the first ends of the first chamber wall and the second chamber wall, and the air supply port is arranged between the second ends of the first chamber wall and the second chamber wall; the overflow port is arranged in the second chamber wall, the first chamber wall is partially convex in a direction away from the overflow port to form an outward convex chamber wall, and the drainage structure guides the airflow to flow toward the outward convex chamber wall.

[0018] As an optional technical solution of the air duct assembly, the drainage structure includes a main drainage rib plate, one end of which extends to the outlet end of the mixing section and is spaced apart from the first cavity wall and the second cavity wall, and the second end of the main drainage rib plate extends in a direction toward the outer convex cavity wall;

[0019] And / or, a flow guiding structure is provided in the pressure stabilizing cavity, the flow guiding structure is located between the air supply port and the outer convex cavity wall, and the flow guiding structure guides part of the air flow at the outer convex cavity wall to flow toward the air supply port;

[0020] And / or, the outer convex cavity wall is an arc cavity wall opening toward the interior of the pressure stabilizing cavity.

[0021] As an optional technical solution for an air duct assembly, the air supply module includes an air supply fan, the shell has a connecting air outlet, the air outlet end of the air supply fan is connected to the connecting air outlet, the air inlet end of the first air duct and the air inlet end of the second air duct are arranged side by side and are both connected to the connecting air outlet.

[0022] As an optional technical solution of an air duct assembly, a flow-blocking structure is provided in the second air duct;

[0023] And / or, the flow area of ​​the air inlet end of the first air duct is greater than or equal to the flow area of ​​the air inlet end of the second air duct.

[0024] As an optional technical solution for an air duct assembly, the second air duct includes two heating sections that are arranged side by side and connected by a bend, the heating unit is arranged across the two heating sections, and the heating unit has two groups of heating channels that are arranged side by side and separated, and the two groups of heating channels are respectively connected in series in the two heating sections.

[0025] A cleaning machine comprises an inner tank and the air duct assembly as described above, wherein the air suction port and the air supply port are both connected to the inner tank, and the air overflow port is connected to the external space of the cleaning machine.

[0026] Beneficial effects of the utility model:

[0027] The air duct assembly and cleaning machine provided by the utility model, because a part of the external air flow introduced by the air supply module enters the first air duct and forms a negative pressure at the air suction port, the hot and humid air flow inside the inner tank is prompted to enter the first air duct through the air suction port and mix with the dry and cold air flow in the first air duct, thereby reducing the humidity of the air flow downstream of the first air duct, that is, the humidity of the mixed air flow flowing from the first air duct to the air supply port can be reduced as a whole, thereby improving the efficiency of drying the objects inside the inner tank; secondly, because an ejection section for accelerating the air flow is provided in the first air duct, the speed and smoothness of the discharge of the hot and humid gas from the inner tank through the air suction port can be increased, thereby improving the dehumidification and drying effect of the air duct assembly and improving the drying efficiency of the cleaning machine; because the provision of The second air duct has a heating unit, and another part of the airflow introduced by the air supply module is heated by the heating module when passing through the second air duct, which can increase the temperature of the gas flowing into the air supply port, thereby ensuring an improved drying effect on the objects in the inner tank; furthermore, since the shell is provided with an overflow port connected to the first air duct and / or the second air duct, the pressure of the hot and humid airflow discharged from the inner tank is increased after mixing with the airflow entering the first air duct, so that part of the mixed airflow can be discharged to the outside of the air duct assembly through the overflow port, thereby avoiding the problem of increased air pressure inside the inner tank caused by the introduction of external airflow into the inner tank, ensuring the balance of the air pressure inside the inner tank, reducing the probability of overflow of hot and humid airflow inside the inner tank, and improving the reliability of the cleaning machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the disassembled structure of the air duct assembly provided in the embodiment of the utility model;

[0029] Figure 2 This is a front view of the air duct assembly provided by the embodiment of the utility model with the cover removed;

[0030] Figure 3 It is a schematic diagram of the air flow inside the air duct assembly provided in an embodiment of the utility model.

[0031] In the figure:

[0032] 1. Shell; 11. Bottom shell; 111. Bottom plate; 112. Bottom enclosure; 12. Cover; 121. Cover plate; 122. Cover enclosure; 13. First air duct; 131. Injection section; 132. Mixing section; 1321. Primary mixing section; 1322. Throat section; 1323. Expanding section; 133. Pressure stabilizing chamber; 14. Second air duct; 141. Air inlet section; 142. Arc section; 143. Heating section; 144. Air outlet Segment; 15, first cavity wall; 151, outer convex cavity wall; 152, inner concave cavity wall; 153, flow guide cavity wall; 16, second cavity wall; 17, flow guide structure; 171, main flow guide rib plate; 172, auxiliary flow guide rib plate; 18, flow guide structure; 19, flow blocking structure; 110, flow blocking structure; 120, arc-shaped flow guide part; 130, air extraction port; 140, air supply port; 150, overflow port; 160, mounting groove; 170, air extraction duct;

[0033] 2. Air supply fan; 21. Fan air outlet; 22. Fan air inlet;

[0034] 3. Air inlet cover; 31. Cover the air inlet;

[0035] 4. Heating unit. DETAILED DESCRIPTION

[0036] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0037] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0039] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0040] The present embodiment provides an air duct assembly, which can be applied to a dishwasher or other washing machine capable of washing and drying objects in an inner tank, so as to improve the drying efficiency during the drying process of the objects in the inner tank and improve the safety of the washing machine.

[0041] The cleaning machine comprises a main body and a door. The main body comprises an inner tank and a housing arranged outside the inner tank, the inner tank has a front opening, and the housing forms the overall shape of the main body; the door is movably arranged at the front side of the main body to selectively open or close the front opening of the inner tank.

[0042] like Figures 1 to 3 As shown, the air duct assembly is arranged between the inner liner and the casing, and the air duct assembly includes a shell 1 and an air supply module. The shell 1 has a first air duct 13 and a second air duct 14 that are independent of each other, and the shell 1 has an air suction port 130 for the inner liner air flow to flow into, an air supply port 140 and an air overflow port 150 for the air flow to be delivered to the inner liner; the air inlet end of the first air duct 13 is connected to the air outlet of the air supply module, and the air outlet end of the first air duct 13 is connected to the air supply port 140. The first air duct 13 has a function for accelerating the air flow. The movable introduction section 131 is arranged near the air suction port 130 to form a negative pressure at the air suction port 130 for the air flow in the inner tank to enter the first air duct 13; the air inlet end of the second air duct 14 is connected to the air outlet end of the air supply module, and the air outlet end of the second air duct 14 is connected to the air supply port 140. A heating unit 4 is arranged inside the second air duct 14 to heat the air flow passing through the second air duct 14, and the overflow port 150 is connected to the first air duct 13 and / or the second air duct 14.

[0043] The air duct assembly and the cleaning machine provided in the present embodiment, because part of the external airflow introduced by the air supply module enters the first air duct 13 and forms a negative pressure at the air suction port 130, the hot and humid airflow inside the inner tank is prompted to enter the first air duct 13 through the air suction port 130 and mix with the dry and cold airflow in the first air duct 13, thereby reducing the humidity of the airflow downstream of the first air duct 13, that is, the humidity of the mixed airflow flowing from the first air duct 13 to the air supply port 140 can be reduced as a whole, thereby improving the efficiency of drying the objects inside the inner tank; secondly, because the introduction section 131 for accelerating the airflow is provided in the first air duct 13, the speed and smoothness of the discharge of the hot and humid gas from the inner tank through the air suction port 130 can be increased, thereby improving the dehumidification and drying effect of the air duct assembly and improving the drying efficiency of the cleaning machine; A second air duct 14 with a heating unit 4 is provided, and another part of the airflow introduced by the air supply module is heated by the heating module when passing through the second air duct 14, which can increase the temperature of the gas flowing into the air supply port 140, thereby ensuring an improved drying effect on the objects in the inner tank; furthermore, since the shell 1 is provided with an overflow port 150 connected to the first air duct 13 and / or the second air duct 14, the pressure of the hot and humid airflow discharged from the inner tank is increased after mixing with the airflow entering the first air duct 13, so that part of the mixed airflow can be discharged to the outside of the air duct assembly through the overflow port 150, thereby avoiding the problem of increased air pressure inside the inner tank caused by the introduction of external airflow into the inner tank, ensuring the balance of the air pressure inside the inner tank, reducing the probability of overflow of hot and humid airflow inside the inner tank, and improving the reliability of the cleaning machine.

[0044] The air supply module includes an air supply fan 2, the housing 1 has a connecting vent, the air outlet of the air supply fan 2 is connected to the connecting vent, and the air inlet of the first air duct 13 and the air inlet of the second air duct 14 are arranged side by side and are both connected to the connecting vent. Thus, external dry air is introduced into the first air duct 13 and the second air duct 14 at the same time through an air supply fan, which reduces costs and simplifies the overall structure of the air duct assembly. In other embodiments, the air supply module may include two air supply fans 2, wherein the air outlet of one air supply fan 2 is connected to the air inlet of the first air duct 13, and the air outlet of the other air supply fan 2 is connected to the air inlet of the second air duct 14.

[0045] like Figure 1 As shown, in order to improve the installation convenience of the air supply fan 2 in the shell 1, the shell 1 has a mounting groove 160, and the groove wall of the mounting groove 160 is provided with a ventilation inlet. The air supply fan 2 is installed in the mounting groove 160, and the fan outlet 21 of the air supply fan 2 is directly connected to the ventilation inlet, and the first end of the first air duct 13 and the first end of the second air duct 14 are both connected to the ventilation inlet.

[0046] The housing 1 has a first side surface and a second side surface that are arranged opposite to each other in the thickness direction, the second side surface is used to cooperate with the inner container, the mounting groove 160 has a notch that passes through the first side surface, and the fan air inlet 22 of the air supply fan 2 is away from the second side surface. This arrangement is conducive to the disassembly and assembly of the air supply fan 2 in the mounting groove 160, and is conducive to the drainage of the air supply fan 2.

[0047] Furthermore, the air duct assembly further includes an air inlet cover 3, which is covered at the notch of the mounting groove 160 and fastened to the housing 1, so that the air supply fan 2 is sandwiched between the air inlet cover 3 and the bottom of the mounting groove 160 to protect the air supply fan 2. The air inlet cover 3 is provided with a cover air inlet 31, which is connected to the fan air inlet 22.

[0048] In order to improve the convenience of processing the air duct in the housing 1, the housing 1 includes a bottom shell 11 and a cover body 12. The bottom shell 11 and the cover body 12 together form a first air duct 13 and a second air duct 14. The air inlet 130, the air overflow port 150 and the air supply port 140 are all arranged at the bottom shell 11. The bottom shell 11 is provided with the above-mentioned mounting groove 160.

[0049] Furthermore, the bottom shell 11 includes a bottom plate portion 111 and a bottom surrounding plate portion 112 arranged around the periphery of the bottom plate portion 111, the bottom plate portion 111 and the bottom surrounding plate portion 112 together form a groove with an opening on one side, the cover body 12 is covered at the notch of the groove to close part of the notch of the groove, the area of ​​the groove closed by the cover body 12 forms an air duct area, and the part of the groove not closed by the cover plate forms an installation groove 160.

[0050] The cover body 12 includes a cover plate portion 121 and a cover edge portion 122 arranged around the periphery of the cover plate portion 121. The cover plate portion 121 is opposite to the bottom plate portion 111 and is spaced apart. The cover edge portion 122 fits closely with the bottom plate portion 112 so that the cover body 12 closes the air duct area of ​​the groove. A ventilation inlet is opened on the bottom plate portion 112 on one side facing the mounting groove 160.

[0051] The bottom shell 11 further includes a plurality of partition ribs protruding from the bottom plate portion 111, wherein a first air duct 13 is formed between two partition ribs, and a second air duct 14 is formed between two partition ribs. The first air duct 13 and the second air duct 14 are formed by surrounding with the partition ribs, which is beneficial to the forming of the second air duct 14 and the first air duct 13, and reduces the overall weight of the bottom shell 11. Specifically, one side of the partition rib is connected to the bottom plate portion 111, and the other side extends to abut against the cover plate portion 121, so as to prevent leakage of the first air duct 13 and the second air duct 14 in the thickness direction of the bottom shell 11.

[0052] To simplify the structure, in the present embodiment, the second air duct 14 and the first air duct 13 share one of the dividing ribs to reduce the number of dividing ribs, and the second air duct 14 and the first air duct 13 are at least partially arranged side by side to improve the structural compactness of the bottom shell 11 and reduce the overall footprint of the air duct assembly.

[0053] like Figure 2 and Figure 3 As shown, the flow area of ​​the ejection section 131 gradually decreases in the direction away from the air supply fan 2. In the present embodiment, the first air duct 13 includes a mixing section 132. The mixing section 132 is connected to the side of the ejection section 131 away from the air supply fan 2, and the minimum flow area of ​​the ejection section 131 is smaller than the flow area of ​​the mixing section 132. The air intake port 130 is connected to the air intake end of the mixing section 132.

[0054] By setting the introduction section 131, when the external air flow flows in the introduction section 131, the flow area of ​​the introduction section 131 gradually decreases, causing the air flow velocity to increase and the air pressure to decrease. At the same time, since the minimum width of the introduction section 131 is smaller than the width of the mixing section 132, the air flow velocity reaches the maximum at the connection point between the introduction section 131 and the mixing section 132, and the air pressure reaches the lowest at the connection point. As a result, the air flow at the air suction port 130 will flow toward the air inlet end of the mixing section 132 under the action of negative pressure, thereby prompting the humid and hot air flow in the inner tank to be discharged into the first air duct 13 through the air suction port 130, thereby ensuring the smooth discharge of the humid and hot air flow in the inner tank through the air suction port 130 when the air supply fan 2 is running.

[0055] It is worth noting that "air flow connection" refers to the spatial position relationship between two components or parts (hereinafter collectively referred to as the first part and the second part), that is, the fluid (gas, liquid or a mixture of the two) can flow from the first part along the flow path or / and be transported to the second part. The first part and the second part can be directly connected, or the first part and the second part can be indirectly connected through at least one third party. The third party can be a fluid channel such as a pipe, channel, duct, guide member, hole, groove, etc., or it can be a chamber that allows fluid to flow through, or a combination of the above.

[0056] Furthermore, the housing 1 has an exhaust duct 170, a first end of the exhaust duct 170 is connected to the exhaust port 130, a second end of the exhaust duct 170 is arranged side by side with the exhaust end of the ejection section 131, and the second end of the exhaust duct 170 is connected to the air inlet end of the mixing section 132. The arrangement of the exhaust duct 170 is conducive to the connection between the exhaust port 130 and the mixing section 132; at the same time, since the second end of the exhaust duct 170 is arranged side by side with the exhaust end of the ejection section 131, the airflow flowing out of the exhaust duct 170 flows toward the downstream of the mixing section 132, avoiding the reverse impact between the airflow flowing out of the exhaust duct 170 and the airflow flowing out of the ejection section 131, ensuring the smoothness of the airflow in the mixing section 132, and improving the smoothness of exhaust.

[0057] In order to ensure the effect of the airflow being introduced at the outlet of the introduction section 131, in this embodiment, the introduction section 131 has two relatively arranged introduction channel walls, the two introduction channel walls gradually approach each other in the direction toward the mixing section 132, and the angle between the two introduction channel walls is an acute angle. The two introduction channel walls are arranged at an acute angle, so that the length of the introduction section 131 can be increased while the minimum flow area and the maximum flow area of ​​the introduction section 131 remain unchanged, thereby improving the stability of the airflow. Furthermore, the angle between the two introduction channel walls is 15° to 60°, and more preferably 15° to 45°.

[0058] Furthermore, a transition section is connected between the ejection section 131 and the mixing section 132, and the flow area of ​​the transition section is equal to the minimum flow area of ​​the ejection section 131, so as to achieve a smooth transition of the airflow from the ejection section 131 to the mixing section 132. The extension length of the transition section in the airflow direction is less than the width of the transition section.

[0059] Furthermore, the first air duct 13 also includes a pressure stabilizing chamber 133, which is connected to the air outlet of the mixing section 132, and the air delivery port 140 is arranged on the side of the pressure stabilizing chamber 133 away from the mixing section 132. The flow area of ​​the pressure stabilizing chamber 133 is larger than the maximum flow area of ​​the mixing section 132, and an overflow port 150 is arranged on one side of the cavity wall of the pressure stabilizing chamber 133. By providing a pressure stabilizing chamber 133 with a larger flow area, the mixed airflow gradually slows down after flowing into the pressure stabilizing chamber 133, and the airflow pressure tends to be stable, which is conducive to ensuring the stability of the airflow entering the inner liner, reducing the probability of forming vortices at 140, and improving the smoothness of air intake to the inner liner; at the same time, the overflow port 150 is connected to the pressure stabilizing chamber 133, so that the airflow flowing out through the overflow port 150 is relatively stable, and the noise when the airflow flows out of the overflow port 150 is reduced.

[0060] In this embodiment, the mixing section 132 includes a primary mixing section 1321 and a trumpet-shaped expansion section 1323, the expansion section 1323 is connected to the end of the primary mixing section 1321 away from the introduction section 131, the flow area of ​​the expansion section 1323 gradually increases in the direction away from the introduction section 131, and the flow area of ​​the primary mixing section 1321 gradually decreases in the direction away from the introduction section 131. Therefore, by setting the primary mixing section 1321, the flow area of ​​the primary mixing section 1321 at the inlet end can be increased, so as to facilitate the connection between the exhaust duct 170 and the ejection section 131 and the inlet end of the primary mixing section 1321. On the basis of keeping the minimum flow area of ​​the ejection section 131 unchanged, the flow area of ​​the outlet end of the exhaust duct 170 is increased to ensure the smoothness of the airflow out of the exhaust duct 170. By setting the expansion section 1323, when the mixed airflow flows in the expansion section 1323, the flow area of ​​the expansion section 1323 gradually increases, the flow rate of the mixed airflow slows down, and the pressure gradually rises, which is beneficial to increase the pressure of the first air duct 13 at the outlet end, thereby facilitating part of the airflow to be discharged through the overflow port 150. Specifically, the expansion section 1323 is located between the primary mixing section 1321 and the pressure stabilizing chamber 133.

[0061] In other embodiments, the mixing section 132 may also be provided with only the expanding section 1323 , or the mixing section 132 may be provided with only the primary mixing section 1321 .

[0062] In this embodiment, the angle between the channel walls on the two opposite sides of the expansion section 1323 is 3° to 45°, preferably 5° to 18°, so as to better ensure the pressurization effect of the expansion section 1323 on the airflow.

[0063] Furthermore, the mixing section 132 also includes a throat section 1322, which is connected between the ejection section 131 and the expansion section 1323, and the flow area of ​​the throat section 1322 is everywhere. The setting of the throat section 1322 can better ensure the mixing uniformity and flow stability of the airflow outflowing from the inner tank and the airflow outflowing from the ejection section 131, and then help to ensure the negative pressure stability at the connection point between the mixing section 132 and the ejection section 131, and improve the smoothness of the extraction of the humid hot airflow through the exhaust port 130. Preferably, the length of the throat section 1322 along its extension direction is L, and its width is d, and L / d=1~6.

[0064] The pressure stabilizing chamber 133 has a first chamber wall 15 and a second chamber wall 16 that are arranged opposite to each other, an air supply port 140 of the pressure stabilizing chamber 133 is formed between the first end of the first chamber wall 15 and the first end of the second chamber wall 16, a connecting port is formed between the second end of the first chamber wall 15 and the second end of the second chamber wall 16, an air outlet of the second air duct 14 is connected to the connecting port, and the air supply port 140 is arranged between the second end of the first chamber wall 15 and the second end of the second chamber wall 16. That is, the air supply port 140 is arranged correspondingly at the location of the connecting port.

[0065] In this embodiment, a drainage structure 17 is provided at the inlet end of the pressure stabilizing chamber 133, and the drainage structure 17 guides the airflow entering the pressure stabilizing chamber 133 to flow to the side away from the overflow port 150 and the air supply port 140, thereby preventing the airflow entering the pressure stabilizing chamber 133 from being directly discharged through the overflow port 150 or directly entering the inner tank through the air supply port 140, extending the flow path of the mixed airflow in the pressure stabilizing chamber 133, thereby improving the uniformity of the mixed airflow flowing inside the pressure stabilizing chamber 133, and then improving the uniformity of the air pressure at various locations in the pressure stabilizing chamber 133, improving the pressure stabilization effect, and ensuring the air pressure stability and uniformity of the airflow flowing to the air supply port 140. Specifically, the overflow port 150 is provided on the second cavity wall 16, and the drainage structure 17 guides the airflow entering the pressure stabilizing chamber 133 to flow to the first cavity wall 15.

[0066] In order to improve the pressure stabilizing effect, the first cavity wall 15 has an outer convex cavity wall 151 that convexes in the direction away from the overflow port 150, and the drainage structure 17 guides the airflow to flow toward the outer convex cavity wall 151. This arrangement can increase the distance between the outer convex cavity wall 151 and the overflow port 150 and the air supply port 140, thereby increasing the residence time of the airflow in the pressure stabilizing cavity 133, improving the mixing uniformity of the mixed airflow inside the pressure stabilizing cavity 133, and enhancing the pressure stabilizing effect.

[0067] The outer convex cavity wall 151 is an arc cavity wall opening toward the inside of the pressure stabilizing cavity 133, so as to improve the stability and smoothness of the mixed airflow flowing in the pressure stabilizing cavity 133 and avoid the problem of dead points of airflow caused by local inflection points. The outer convex cavity wall 151 is smoothly connected to the rest of the first cavity wall 15.

[0068] The first cavity wall 15 also includes a concave cavity wall 152 connected between the convex cavity wall 151 and the channel wall of the mixing section 132. The concave cavity wall 152 is recessed along the inner side toward the pressure stabilizing cavity 133, and one end of the concave cavity wall 152 is smoothly connected to the corresponding side channel wall of the mixing section 132, and the other end of the concave cavity wall 152 is smoothly connected to the convex cavity wall 151. The setting of the concave cavity wall 152 improves the smoothness of the connection between it and the convex cavity wall 151, and is conducive to guiding the mixed airflow entering the pressure stabilizing cavity 133 to flow to the convex cavity wall 151, thereby enhancing the drainage effect. In other embodiments, the cavity wall between the channel wall connected to the mixing section 132 and the convex cavity wall 151 can be set straight.

[0069] In this embodiment, the drainage structure 17 includes a main drainage rib plate 171, one end of which extends to the outlet end of the mixing section 132 and is spaced apart from the first cavity wall 15 and the second cavity wall 16, and the second end of the main drainage rib plate 171 extends in a direction toward the outer convex cavity wall 151. The arrangement of the main drainage rib plate 171 can divert the airflow entering the pressure stabilizing cavity 133, so that part of the airflow can flow along the main drainage rib plate 171 in a direction toward the outer convex cavity wall 151, and the other part of the airflow can flow to the overflow port 150 after passing through the main drainage rib plate 171, ensuring that part of the airflow will be discharged outward through the overflow port 150.

[0070] Furthermore, the main drainage rib plate 171 is an arc-shaped rib plate structure, and the arc-shaped opening faces the inner concave cavity wall 152 to enhance the drainage effect of the main drainage rib plate 171. The main drainage rib plate 171 is preferably an arc structure that is concentrically arranged with the inner concave cavity wall 152. In other embodiments, the drainage structure 17 may also be an inclined drainage plate structure.

[0071] The drainage structure 17 includes an auxiliary drainage rib plate 172, which is located between the main drainage rib plate 171 and the second cavity wall 16, the first end of the auxiliary drainage rib plate 172 is connected to the second cavity wall 16, the second end of the auxiliary drainage rib plate 172 extends in a direction away from the second cavity wall 16, and the second end of the auxiliary drainage rib plate 172 is located on the side of the overflow port 150 away from the air supply port 140. This arrangement can make most of the airflow entering the pressure stabilizing chamber 133 flow in a direction away from the overflow port 150 under the drainage effect of the drainage structure 17 through the cooperation of the main drainage rib plate 171 and the auxiliary drainage rib plate 172, while a small part of the airflow can flow to the overflow port 150 after flowing through a small section under the drainage effect of the auxiliary drainage rib plate 172, so as to ensure that part of the airflow in the pressure stabilizing chamber 133 can be discharged through the overflow port 150.

[0072] Furthermore, the first cavity wall 15 further includes a guide cavity wall 153 located between the air supply port 140 and the outer convex cavity wall 151 . The guide cavity wall 153 is smoothly connected to the outer convex cavity wall 151 to guide the air flow through the guide cavity wall 153 to flow toward the air supply port 140 .

[0073] A guide structure 18 is provided in the pressure stabilizing chamber 133, and the guide structure 18 is located between the air supply port 140 and the outer convex cavity wall 151. The guide structure 18 guides part of the air flow at the outer convex cavity wall 151 to flow toward the air supply port 140, preventing most of the mixed air flow from being directly discharged through the overflow port 150.

[0074] In this embodiment, the flow guiding structure 18 includes flow guiding convex ribs, and at least two flow guiding convex ribs are arranged at intervals along the extending direction of the flow guiding cavity wall 153 to enhance the flow guiding effect.

[0075] Furthermore, a flow blocking structure 19 is provided between the overflow port 150 and the air supply port 140, and the flow blocking structure 19 extends in a direction toward the inside of the pressure stabilizing chamber 133. The flow blocking structure 19 can stop the airflow flowing from the second air duct 14 to the air supply port 140 from flowing toward the overflow port 150, thereby reducing the amount of dry airflow discharged, thereby increasing the dryness of the airflow entering the air supply port 140 and improving the drying efficiency.

[0076] In this embodiment, the baffle structure 19 is a baffle plate structure, and one end of the baffle structure 19 and the overflow port 150 extend toward the side wall of the air supply port 140 to improve the blocking effect and the convenience of setting the baffle structure 19. In other embodiments, the baffle structure 19 can also be connected to the second cavity wall 16 between the air supply port 140 and the overflow port 150.

[0077] In this embodiment, the heating unit 4 is a PTC heating unit, which occupies a small space, has high heating efficiency, and is convenient for installation in the housing 1. In other embodiments, the heating unit 4 may also be other types of heating units 4, which are convenient for the electric heating wire laid inside the second air duct 14 or the electric heating tube set in the second air duct 14. The PTC heating unit may be an existing mature product, and this embodiment does not limit its structure.

[0078] In order to improve the heating efficiency of the heating unit 4 on the airflow, in this embodiment, the second air duct 14 includes two heating sections 143 arranged side by side and connected in a bent manner, and the heating unit 4 is arranged across the two heating sections 143, that is, the heating unit 4 has two groups of heating channels, each group of heating channels is connected in series to the corresponding heating section 143, and the extension direction of each group of heating channels extends along the extension direction of the heating section 143. When the airflow flows through the heating section 143 located upstream, it is heated once by the heating unit 4, and then when the airflow changes direction and flows through another heating section 143, it is heated twice by the heating unit 4, which can increase the temperature of the heated airflow and improve the efficiency of airflow heating.

[0079] To improve the convenience of setting up the heating unit 4, the width of the two heating sections 143 along their side-by-side direction is equal to the width of the heating unit 4 in this direction, and an insertion port is opened on the channel wall between the two heating sections 143. The heating unit 4 is spanned between the two heating sections 143 through the insertion port, and the opposite side walls of the heating unit 4 are respectively abutted against the channel walls of the two heating sections 143 away from each other to ensure that the airflow flowing through the heating sections 143 can all flow through the heating unit 4, thereby improving the uniformity of heating the airflow and ensuring the heating effect.

[0080] The two heating sections 143 are connected by an arc connecting section, so that the two heating sections 143 and the arc connecting section form a U-shaped channel structure, ensuring the smooth flow of the airflow from the upstream heating section 143 to the downstream heating section 143.

[0081] Furthermore, the second air duct 14 further includes an air inlet section 141, which is opposite to and spaced from the heating section 143, and the air inlet section 141 shares a portion of the channel wall with the first air duct 13, and the heating section 143 is located on a side of the air inlet section 141 away from the first air duct 13. In this way, the compactness of the structures of the second air duct 14 and the first air duct 13 can be improved, and while ensuring the installation space of the heating section 143, the overall space occupied by the air duct assembly can be reduced.

[0082] The air inlet section 141 is connected to the upstream heating section 143 through the arc section 142 to improve the smoothness of the airflow from the air inlet section 141 to the heating section 143. Further, an arc guide 120 is provided inside the arc section 142, the bending direction of the arc guide 120 is consistent with the bending direction of the arc section 142, and the arc guide 120 and the two opposite channel walls of the arc section 142 are arranged at intervals. The arrangement of the arc guide 120 can guide the airflow to be split when it flows through the arc section 142, so that part of the airflow can flow between the arc guide 120 and the outer convex channel wall of the arc section 142, and part of the airflow can flow between the arc guide 120 and the inner concave channel wall of the arc section 142, thereby improving the uniformity of the airflow flowing in the arc section 142, thereby improving the uniformity of the airflow when it flows through the heating section 143 and the heating unit 4, and improving the heating effect.

[0083] Furthermore, the distance between the arc-shaped guide portion 120 and the inner concave channel wall is greater than the distance between the arc-shaped guide portion 120 and the outer convex channel wall, thereby making the airflow on both sides of the arc-shaped guide portion 120 more uniform, further improving the uniformity of airflow.

[0084] In this embodiment, the second air duct 14 further includes an air outlet section 144 connected to the outlet end of the downstream heating section 143, and the air outlet end of the air outlet section 144 extends to the air supply port 140. The air outlet section 144 preferably shares part of the channel wall with the pressure stabilizing chamber 133 to improve the compactness of the structure. Specifically, the guide cavity wall 153 of the pressure stabilizing chamber 133 is a partial cavity wall of the air outlet section 144.

[0085] Furthermore, the air outlet section 144 is L-shaped to improve the convenience of cooperation between the air outlet section 144 and the pressure stabilizing chamber 133 and the connection with the heating section 143. In other embodiments, the air outlet end may also adopt other shapes as long as the airflow from the heating section 143 to the air delivery port 140 can be realized.

[0086] Since the heating unit 4 needs to be arranged in the second air duct 14, the minimum width of the second air duct 14 at the heating section 143 is limited by the size of the heating unit 4. In order to avoid the problem that most of the outlet airflow of the air supply fan 2 flows to the second air duct 14 due to the large width of the second air duct 14, resulting in a smaller airflow in the first air duct 13, in this embodiment, a flow blocking structure 110 is arranged in the second air duct 14, and the flow blocking structure 110 is used to increase the flow pressure inside the second air duct 14 and reduce the air intake of the second air duct 14, so as to better balance the air intake of the second air duct 14 and the first air duct 13.

[0087] In this embodiment, the flow blocking structure 110 includes a flow blocking rib plate disposed at the air outlet section 144, and a plurality of flow blocking rib plates are disposed at intervals along the extension direction of the air outlet section 144, and two adjacent flow blocking rib plates are respectively connected to opposite side walls of the air outlet section 144. This can increase the resistance of the airflow when it flows through the air outlet section 144. Furthermore, one end of the flow blocking rib plate is connected to the air duct wall, and the other end extends obliquely along the airflow flow direction to avoid excessive increase in wind resistance caused by the arrangement of the flow blocking rib plate, thereby reducing the noise of the airflow flowing in the second air duct 14.

[0088] In other embodiments, the flow-blocking structure 110 may also be disposed at the air inlet section 141. In other embodiments, the flow-blocking structure 110 may also be provided with other structures, for example, a protruding structure may be provided at the bottom of the second air duct 14.

[0089] Furthermore, in this embodiment, the flow area of ​​the air inlet of the first air duct 13 is greater than or equal to the flow area of ​​the air inlet of the second air duct 14, thereby further balancing the air intake from the fan outlet 21 to the second air duct 14 and the first air duct 13.

[0090] This embodiment also provides a cleaning machine, including an inner tank and the above-mentioned air duct assembly, wherein the cleaning machine can be but is not limited to a dishwasher, a disinfection cabinet, and other equipment that needs to dry the objects inside the inner tank.

[0091] The cleaning machine provided in this embodiment, by adopting the above-mentioned air duct assembly, can improve the drying efficiency of objects in the inner tank and reduce the probability of air flow overflow inside the inner tank, thereby improving the safety and user experience of the cleaning machine.

[0092] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. An air duct assembly for a cleaning machine, the cleaning machine having an inner tank, characterized in that: The air duct assembly comprises a shell (1) and an air supply module, the shell (1) has a first air duct (13) and a second air duct (14) which are independent of each other, and the shell (1) has an air suction port (130) for the airflow of the inner liner to flow in, an air supply port (140) for the airflow to be delivered to the inner liner, and an air overflow port (150); The air inlet end of the first air duct (13) is communicated with the air outlet of the air supply module, and the air outlet end of the first air duct (13) is communicated with the air supply port (140). The first air duct (13) has an introduction section (131) for accelerating the flow of air. The introduction section (131) is arranged adjacent to the air extraction port (130) so that a negative pressure is formed at the air extraction port (130) for the air flow in the inner container to enter the first air duct (13); The air inlet end of the second air duct (14) is connected to the air outlet end of the air supply module, and the air outlet end of the second air duct (14) is connected to the air supply port (140). A heating unit (4) is provided inside the second air duct (14) to heat the air flow passing through the second air duct (14), and the overflow port (150) is connected to the first air duct (13) and / or the second air duct (14).

2. The air duct assembly according to claim 1, characterized in that: The air inlet end of the introduction section (131) forms the air inlet end of the first air duct (13), and the flow area of ​​the introduction section (131) gradually increases in the direction toward the air outlet end of the air supply module; And / or, the first air duct (13) comprises a mixing section (132), the mixing section (132) is connected between the air outlet end of the ejection section (131) and the air supply port (140), the minimum flow area of ​​the ejection section (131) is smaller than the flow area of ​​the mixing section (132), and the air suction port (130) is connected to the air inlet end of the mixing section (132).

3. The air duct assembly according to claim 2, characterized in that: The air inlet end of the mixing section (132) comprises a primary mixing section (1321), the flow area of ​​the primary mixing section (1321) gradually decreases in a direction away from the ejection section (131), and the air suction port (130) is connected to the air inlet end of the primary mixing section (1321); And / or, the mixing section (132) comprises a flared section (1323) arranged in a trumpet shape, and the flow area of ​​the flared section (1323) gradually increases in a direction away from the ejection section (131).

4. The air duct assembly according to claim 2, characterized in that: The first air duct (13) comprises a pressure stabilizing chamber (133), the pressure stabilizing chamber (133) is connected to the air outlet end of the mixing section (132), the air supply port (140) is arranged on a side of the pressure stabilizing chamber (133) away from the mixing section (132), the flow area of ​​the pressure stabilizing chamber (133) is larger than the maximum flow area of ​​the mixing section (132), and the overflow port (150) is arranged on a side wall of the pressure stabilizing chamber (133).

5. The air duct assembly according to claim 4, characterized in that: The air inlet end of the pressure stabilizing chamber (133) is provided with a drainage structure (17), and the drainage structure (17) guides the mixed airflow entering the pressure stabilizing chamber (133) to flow in a direction away from the overflow port (150) and the air delivery port (140); And / or, a flow blocking structure (19) is provided between the overflow port (150) and the air supply port (140), one end of the flow blocking structure (19) is connected to the side cavity wall where the overflow port (150) is located, and the other end of the flow blocking structure (19) extends in a direction toward the inside of the pressure stabilizing cavity (133).

6. The air duct assembly according to claim 5, characterized in that: The pressure-stabilizing chamber (133) comprises a first chamber wall (15) and a second chamber wall (16) which are arranged opposite to each other and spaced apart from each other; an air inlet end of the pressure-stabilizing chamber (133) is formed between the first ends of the first chamber wall (15) and the second chamber wall (16); the air supply port (140) is arranged between the second ends of the first chamber wall (15) and the second chamber wall (16); the overflow port (150) is arranged on the second chamber wall (16); the first chamber wall (15) is partially convex in a direction away from the overflow port (150) to form an outer convex chamber wall (151); and the drainage structure (17) guides the airflow to flow toward the outer convex chamber wall (151).

7. The air duct assembly according to claim 6, characterized in that: The drainage structure (17) comprises a main drainage rib plate (171), one end of which extends to the outlet end of the mixing section (132) and is spaced apart from the first cavity wall (15) and the second cavity wall (16), and a second end of which extends in a direction toward the outer convex cavity wall (151); And / or, a flow guiding structure (18) is provided in the pressure stabilizing chamber (133), the flow guiding structure (18) is located between the air supply port (140) and the outer convex chamber wall (151), and the flow guiding structure (18) guides part of the air flow at the outer convex chamber wall (151) to flow toward the air supply port (140); And / or, the outer convex cavity wall (151) is an arc cavity wall opening toward the interior of the pressure stabilizing cavity (133).

8. The air duct assembly according to any one of claims 1 to 7, characterized in that: The air supply module comprises an air supply fan (2), the housing (1) has a connecting air opening, the air outlet end of the air supply fan (2) is connected to the connecting air opening, and the air inlet end of the first air duct (13) and the air inlet end of the second air duct (14) are arranged side by side and are both connected to the connecting air opening.

9. The air duct assembly according to claim 8, characterized in that: A flow-blocking structure (110) is provided in the second air duct (14); And / or, the flow area of ​​the air inlet end of the first air duct (13) is greater than or equal to the flow area of ​​the air inlet end of the second air duct (14).

10. The air duct assembly according to any one of claims 1 to 7, characterized in that: The second air duct (14) comprises two heating sections (143) arranged side by side and connected in a bent manner, the heating unit (4) is arranged across the two heating sections (143), and the heating unit (4) has two groups of heating channels arranged side by side and separated therefrom, and the two groups of heating channels are respectively connected in series in the two heating sections (143).

11. A cleaning machine, comprising an inner tank, characterized in that: It also includes an air duct assembly as described in any one of claims 1 to 10, wherein the air suction port (130) and the air supply port (140) are both connected to the inner tank, and the air overflow port (150) is connected to the external space of the cleaning machine.

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