Air draft structure of dish washing machine

Abstract

The utility model provides an air draft structure of a dish-washing machine. The air draft structure of the dish-washing machine comprises a respirator, and the respirator comprises a shell; the air draft mechanism is communicated with the respirator, and the air draft mechanism is arranged on the lateral lower portion of the respirator; the shell is provided with a through hole and an air duct, the air draft mechanism is communicated with the through hole through the air duct, and the air draft mechanism is used for exhausting air in the air duct. According to the air draft structure of the dish-washing machine, the air draft mechanism is communicated with the through hole through the air duct, when the exhaust fan works, negative pressure is formed in the air duct, and most of air in the cavity of the dish-washing machine enters the air duct through the through hole and is exhausted by the air draft mechanism, so that the retention time of water vapor in the cavity is effectively shortened, and the air draft efficiency is improved; liquid can be prevented from being accumulated in the air duct, and potential water damage or mould breeding is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of dishwashers, in particular to an air extraction structure of a dishwasher. BACKGROUND

[0002] A dishwasher is a household appliance used to automatically clean dishes, kitchen utensils and other kitchen items. It uses water jets, cleaning agents and hot air to remove food residue, grease and dirt, thereby achieving efficient cleaning. The drying structure of the dishwasher includes a breather, which is a necessary component of the dishwasher. Its main function is to ensure that the dishes can be quickly dried after washing and rinsing to prevent water stains, bacterial growth and odor generation.

[0003] The water vapor generated during the drying process of the dishwasher in the prior art cannot be quickly and effectively removed, and is easily accumulated on the inner wall. The water evaporation speed is slow, and the user needs a longer time to obtain dry dishes. Long-term moisture accumulation can cause corrosion of the metal parts inside the dishwasher, shorten the service life of the dishwasher, increase the cost of maintenance and replacement, and easily cause bacterial growth and mold growth, thereby generating odor, reducing the use efficiency of the dishwasher and affecting the user experience.

[0004] Therefore, the drying structure of the dishwasher in the prior art has further improvement space. CONTENT OF THE INVENTION

[0005] Therefore, in view of the technical problem that the water vapor generated during the drying process of the dishwasher in the prior art cannot be quickly and effectively removed and is easily accumulated on the inner wall, the present application provides an air extraction structure of a dishwasher. By setting the air extraction structure, the high-temperature steam inside the dishwasher can be quickly removed, the accumulation of water vapor on the inner wall is reduced, the moisture level of the internal environment is reduced, bacterial and mold growth can be effectively prevented, the freshness of the inside of the dishwasher is maintained, the drying time is shortened, the overall drying effect is improved, the use efficiency of the dishwasher is improved, and better user experience can be provided.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical solution: an air extraction structure of a dishwasher, comprising:

[0007] a breather comprising a housing;

[0008] an air extraction mechanism in communication with the breather, the air extraction mechanism being arranged below the breather;

[0009] The housing is provided with a through hole and an air duct, the air extraction mechanism is in communication with the through hole through the air duct, and the air extraction mechanism is used to extract the gas in the air duct.

[0010] Compared with the prior art, the dishwasher comprises a ventilator, an air extractor and an air duct, the air extractor is communicated with the through hole through the air duct, when the air extractor works, negative pressure is formed in the air duct, most of the gas in the dishwasher chamber enters the air duct through the through hole and is discharged by the air extractor, the time of water vapor staying in the chamber is effectively reduced, the air extraction efficiency is improved, the gas in the dishwasher is effectively discharged, and a good ventilation and dry environment is ensured.

[0011] Further, the air duct is further provided with a communication port, and the air extractor is communicated with the air duct through the communication port.

[0012] The end portion of the air duct provided with the drain port is in an arc structure.

[0013] Further, the air duct is provided with a condensing air duct, and the condensing air duct is used for condensing the gas in the air duct.

[0014] The reinforcing ribs are inclined.

[0015] Further, the through hole comprises a first air inlet and a second air inlet, the second air inlet is located below the first air inlet, and the air extractor is communicated with the first air inlet through the air duct.

[0016] The aperture of the first air inlet is R1, and the aperture of the second air inlet is R2.

[0017] R1 = R2.

[0018] Further, the air duct is further provided with a first check piece, and the first check piece is used for guiding the liquid in the condensing air duct out of the first air inlet.

[0019] The first check piece is at least partially higher than the bottom of the first air inlet.

[0020] Further, the air extractor comprises a blower shell and a blower, and the blower is installed in the blower shell.

[0021] The blower shell is provided with a ventilation port, and the ventilation port is communicated with the communication port.

[0022] The side of the blower shell away from the ventilation port is provided with an air outlet, the air outlet is communicated with the ventilation port, and the air outlet is used for discharging the gas in the blower shell.

[0023] Further, the ventilation port is provided with an annular protrusion towards the direction of the communication port, the blower shell is communicated with the communication port through the annular protrusion, and the annular protrusion is at least partially located in the communication port.

[0024] The annular protrusion is arranged obliquely.

[0025] Further, the shell is also provided with an exhaust air passage, the exhaust air passage is in communication with the air duct, the exhaust air passage is located between the first air inlet and the second air inlet;

[0026] The exhaust air passage is provided with a condensation passage, the condensation passage is a passage formed by a plurality of condensation ribs, and the condensation passage is used for condensing water vapor in the dishwasher to realize gas-liquid separation.

[0027] Further, the exhaust air passage is also provided with a second check piece, the second check piece is located on the side of the second air inlet away from the first air inlet, and the second check piece is used for guiding the liquid of the condensation passage out of the second air inlet.

[0028] The condensation passage is used for condensing the gas of the exhaust air passage.

[0029] In some embodiments of the present application, the shell is also provided with a drain passage, one end of the drain passage is provided with a drain water outlet, the other end is provided with a drain water inlet, the drain passage is located below the second air inlet, and the drain passage is an inverted U-shaped structure.

[0030] The shell is also provided with a water baffle and an air hole, the water baffle is located above the side of the drain passage, and the water baffle is used for limiting the air hole.

[0031] The air suction structure of the dishwasher has at least the following technical effects:

[0032] 1. The reinforcing ribs are mainly used for reinforcing the shell, which can effectively disperse the external load and prevent the shell from deforming or breaking during use.

[0033] 2. The first check piece is used for guiding the liquid of the condensation air duct out of the first air inlet, ensuring that the condensed water can be smoothly discharged, and effectively guiding the condensed water. The height of the first check piece is designed to be at least partially higher than the bottom of the first air inlet, which can effectively prevent the condensed water from flowing back into the dishwasher chamber and avoid the accumulation of condensed water.

[0034] 3. The exhaust air passage is provided with a condensation passage, which can effectively condense the water vapor in the dishwasher through the arrangement of a plurality of condensation ribs to realize gas-liquid separation. The arrangement of the exhaust air passage makes the airflow flow along a specific path when passing through the exhaust air passage, avoiding the phenomena of turbulent flow and backflow. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1is a three-dimensional structural schematic of an air extraction structure of a dishwasher provided by an embodiment of the present application Figure 1 ;

[0036] Figure 2 is a partial exploded structural schematic of an air extraction structure of a dishwasher provided by an embodiment of the present application

[0037] Figure 3 is a three-dimensional structural schematic of an air extraction structure of a dishwasher provided by an embodiment of the present application Figure 2 ;

[0038] Figure 4 is Figure 2 an enlarged schematic view of a partial A in the middle.

[0039] Reference signs:

[0040] 1, respirator; 2, air extraction structure;

[0041] 11, shell;

[0042] 112, air duct; 113, air exhaust passage; 114, drainage passage; 115, water baffle; 116, flow meter module; 117, first water inlet passage; 118, second water inlet passage; 119, water inlet port;

[0043] 1111, first air inlet; 1112, second air inlet;

[0044] 1121, drainage port; 1122, reinforcing rib; 1123, first check piece; 1124, communication port;

[0045] 1131, condensation rib; 1132, second check piece; 11311, first condensation rib; 11312, second condensation rib;

[0046] 1141, drainage outlet; 1142, drainage inlet;

[0047] 21, air blower shell; 22, air blower; 23, annular protrusion;

[0048] 211, ventilation port; 212, air outlet; 213, first shell; 214, second shell. DETAILED DESCRIPTION

[0049] In order for those skilled in the art to better understand the technical solutions of the present disclosure, the present disclosure is described in detail, clearly and completely below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present disclosure and do not limit the present disclosure.

[0050] In the description of the present application, if the first, second, only for the purpose of distinguishing technical features, and can not be understood as indicating or implying the relative importance or implied indicated the number of technical features or implied indicated the technical features of the order.

[0051] Those skilled in the art should understand that in the disclosure of the present application, the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, therefore the above terms cannot be understood as a limitation of the present application.

[0052] The present application will be further described in detail below with reference to the accompanying drawings, see as Figures 1 to 4 Description.

[0053] The embodiment provides a kind of air extraction structure of dish washer, it is applied in dish washer technical field, specifically, as shown in Figures 1 to 4 Respirator 1 includes housing 11, housing 11 is used to guide the gas flow of dish washer chamber, ensure that gas can smoothly enter air extraction mechanism 2, air extraction mechanism 2 is communicated with respirator 1, air extraction mechanism 2 is arranged below respirator 1, air extraction mechanism 2 is used to extract the gas of dish washer chamber flowing to respirator 1, air extraction mechanism 2 can increase to help shorten drying time, improve the working efficiency of dish washer, while keeping the dryness of dish washer internal environment, housing 11 is equipped with through hole and air duct 112, air extraction mechanism 2 is communicated with through hole by air duct 112, when air extractor works, negative pressure is formed in air duct 112, the gas of dish washer chamber enters air duct 112 by through hole, is discharged by air extraction mechanism 2, ensure that the gas in dish washer is effectively extracted, keep good ventilation and dry environment.

[0054] Further, as Figure 2As shown, the bottom of the air duct 112 is provided with a drain 1121 for draining condensed water or other liquid, which can prevent liquid accumulation in the air duct 112 and avoid potential water damage or mold growth, ensuring the hygiene and safety of the dishwasher. The end of the air duct 112 where the drain 1121 is located is arc-shaped to optimize the water flow path and ensure smooth gas flow. The arc-shaped structure can facilitate the smooth flow of condensed water or other liquid towards the drain 1121, reducing water accumulation. The side wall of the air duct 112 is provided with a communication port 1124, through which the air duct 112 communicates with the air duct 112. The gas in the dishwasher chamber enters the first air inlet 1111 and flows to the air duct 112. The air duct 112 communicates with the air duct 112 through the communication port 1124, and the drain 1121 is located below the communication port 1124. The inner diameter of the communication port 1124 is matched with the outer diameter of the air duct 112, so that the air duct 112 can communicate with the air duct 112 through the communication port 1124, thereby effectively extracting the gas. The communication port 1124 and the drain 1121 are on different sides.

[0055] Specifically, as shown in Figures 1 to 2 The through hole includes a first air inlet 1111 and a second air inlet 1112, and the second air inlet 1112 is located below the first air inlet 1111. The air duct 112 communicates with the first air inlet 1111 through the air duct 112, and most of the gas in the dishwasher chamber enters the first air inlet 1111 and flows to the air duct 112, which is discharged by the air duct 112. When the air duct is not working, the gas circulates internally and can be condensed through the condensation area and then discharged. The first air inlet 1111 and the second air inlet 1112 correspond to the same dishwasher chamber, ensuring effective circulation of the gas. The aperture of the first air inlet 1111 is R1, and the aperture of the second air inlet 1112 is R2, R1=R2, which helps to maintain the uniformity of the gas flow and avoid excessive gas flow resistance, facilitating users to perform daily maintenance and cleaning and prolonging the service life of the dishwasher.

[0056] Further, as shown in Figure 2As shown, the air duct 112 is provided with a condensing air duct, which is an air duct composed of a plurality of reinforcing ribs 1122, mainly used for reinforcing the shell 11, which can effectively disperse the external load and prevent the shell 11 from deforming or breaking during use. The condensing air duct is used for condensing the gas in the air duct 112. The gas in the first air inlet 1111 passes through the condensing air duct and cools down under the action of the temperature difference between the inside and outside, forming condensate water, which flows onto the reinforcing ribs 1122. The condensate water is guided by the reinforcing ribs 1122 and discharged through the through hole, reducing the retention of condensate water in the air duct 112 and reducing the retention of moisture in the dishwasher chamber. The reinforcing ribs 1122 are arranged obliquely downward, and the reinforcing ribs 1122 and the communication port 1124 are located at different side ends. The obliquely arranged reinforcing ribs 1122 can make the airflow flow in a specific direction when passing through the condensing air duct, avoiding turbulence and backflow of the airflow.

[0057] Further, as shown in Figure 2 The air duct 112 is also provided with a first check piece 1123, which is used to guide the condensed condensate water entering the condensing air duct out of the first air inlet 1111, ensuring that the condensate water can be smoothly discharged and effectively guided. Part of the gas in the second air inlet 1112 flows onto the first check piece 1123 after condensation in the condensing air duct and flows back into the dishwasher cavity through the first check piece 1123. The first check piece 1123 is higher than the lowest point of the bottom of the first air inlet 1111, which can effectively prevent the condensate water from flowing back into the dishwasher chamber, avoiding the accumulation of condensate water.

[0058] Further, as shown in Figure 2 The shell 11 is also provided with an air exhaust channel 113 between the first air inlet 1111 and the second air inlet 1112. The air exhaust channel 113 is provided with a condensing channel formed by a plurality of condensing ribs 1131. The condensing channel is used to condense the water vapor in the dishwasher to achieve gas-liquid separation, which can effectively condense the water vapor in the dishwasher to achieve gas-liquid separation. The arrangement of the air exhaust channel 113 makes the airflow flow along a specific path when passing through the air exhaust channel 113, avoiding turbulence and backflow of the airflow. The condensing ribs 1131 include a first condensing rib 11311 and a plurality of second condensing ribs 11312. The second condensing ribs 11312 are arranged at intervals, and the first condensing rib 11311 is arranged obliquely downward. The second condensing rib 11312 is arc-shaped and concave toward the second air inlet 1112, so that when the gas condenses into liquid, it falls from both sides and does not accumulate on the second condensing rib 11312, reducing the accumulation of condensate water. The first condensing rib 11311 and the second condensing rib 11312 are located at different sides of the condensing channel.

[0059] Further, as shown in Figure 2 the exhaust channel 113 is also provided with a second check piece 1132, which is located on the side of the second air inlet 1112 away from the first air inlet 1111. The gas in the second air inlet 1112 passes through the condensing channel and is cooled and forms condensed water under the action of the temperature difference between the inside and outside. The condensed water flows onto the condensing ribs 1131 and then onto the second check piece 1132, which returns to the dishwasher cavity, forming an effective circulation system that maintains the stability of the internal environment of the dishwasher, prevents the accumulation of condensed water in the condensing channel, and helps to improve the overall performance of the dishwasher. The second check piece 1132 is higher than the lowest point of the bottom of the second air inlet 1112, which can effectively prevent the condensed water from flowing back into the dishwasher cavity and prevent the accumulation of condensed water. A small part of the uncondensed gas will enter the air duct 112 through the first air inlet 1111 above and will be finally sucked out of the dishwasher by the air suction mechanism 2. This process helps to keep the inside of the dishwasher dry and prevents the gas from affecting the electrical components.

[0060] In the embodiments of the present application, as shown in Figures 1 to 3 the air suction mechanism 2 includes a blower housing 21 and a blower 22, the blower 22 is installed in the blower housing 21, the blower 22 is responsible for sucking out the gas and pushing the airflow, the side of the blower housing 21 facing the air duct 112 is provided with a ventilation port 211, the ventilation port 211 is correspondingly arranged with the communication port 1124, which ensures the smoothness of the gas flow, reduces the airflow resistance, and improves the air suction efficiency. The side of the blower housing 21 away from the air duct 112 is provided with an air outlet 212, the air outlet 212 is in communication with the ventilation port 211, the air outlet 212 is used for discharging the airflow from the blower housing 21, which ensures the effective and rapid discharge of the airflow inside the dishwasher. Through effective gas extraction and discharge, the moisture level inside the dishwasher is reduced, the risk of moisture damage to the internal components of the dishwasher is reduced, and the safety of the equipment is improved.

[0061] Further, as shown in Figure 2As shown, the ventilation port 211 is provided with an annular protrusion 23 facing the communication port 1124, the blower housing 21 communicates with the communication port 1124 through the annular protrusion 23, the annular protrusion 23 is at least partially located in the communication port 1124, the end of the annular protrusion 23 facing the communication port 1124 is inserted into the communication port, and the annular protrusion 23 is inclinedly arranged, the end of the annular protrusion 23 communicating with the communication port 1124 is lower than the end communicating with the ventilation port 211, which is conducive to guiding the liquid to flow into the air duct 112 along the lower end when the liquid is collected, and then flowing out through the drain port 1121, thereby effectively guiding the liquid and preventing the liquid from flowing into the blower mechanism 2 to damage the blower 22.

[0062] Further, as shown in the drawings, Figure 2 The blower housing 21 comprises a first housing 213 and a second housing 214, the first housing 213 is connected with the second housing 214, the first housing 213 is provided with a connecting piece, the connecting piece is in an oval structure, the size of the connecting piece is matched with the size of the communication port 1124 and the ventilation port 211, the respirator 1 is connected with the first housing 213 through the connecting piece, the connecting piece is in a hollow structure, the ventilation port 211 is arranged on the first housing 213, and the separation design of the first housing 213 and the second housing 214 makes the assembly and maintenance of the blower 22 more convenient, and the user can replace or repair one of the housings 11 as needed without replacing the entire device.

[0063] In the embodiments of the present application, as shown in the drawings, Figures 1 to 3 The shell 11 is further provided with a drain passage 114, a water baffle 115 and an air hole, one end of the drain passage 114 is provided with a drain outlet 1141, and the other end is provided with a drain inlet 1142, the water baffle 115 is located above the side of the drain passage 114, the drain outlet 1141 and the drain inlet 1142 are both arranged below the side of the second air inlet 1112, and the water baffle 115 is correspondingly arranged with the air hole, the water in the inner cavity of the dishwasher enters the drain passage 114 from the drain inlet 1142 under the action of the drain pump, and then is discharged through the drain outlet 1141, in this process, the water baffle 115 seals the air hole under the action of water pressure, when the drain pump stops working, the water pressure decreases, and the water in the pipeline will fall back, at this time, the water baffle 115 is loosened under the action of air pressure, so that the water in the drain passage 114 falls back from the inlet and outlet ends respectively, thereby disconnecting the connection and preventing the occurrence of siphon phenomenon. The drain passage 114 is located below the second air inlet 1112, and the drain passage 114 is in an inverted U-shaped structure, which can effectively prevent the occurrence of siphon phenomenon, when the water flows, the design of the U-shaped structure can form a water seal to prevent backflow of water during the drainage process, ensure the normal operation of the drainage system, reduce the risk of blockage, enhance air circulation, and facilitate cleaning and maintenance.

[0064] Further, the housing 11 is further provided with a flow meter module 116, a first water inlet channel 117, a second water inlet channel 118 and a water inlet port 119. The flow meter module 116 is located below the second air inlet 1112. The water inlet port 119 is arranged in parallel with the drain water inlet 1142. The first water inlet channel 117 is located between the flow meter module 116 and the water inlet port 119. The first water inlet channel 117 is in communication with the water inlet port 119. The first water inlet channel 117 is in communication with the second water inlet channel 118 through the flow meter module 116. The second water inlet channel 118 is in communication with the second air inlet 1112. When the water inlet valve is opened, tap water flows to the first water inlet channel 117 through the water inlet port 119, enters the flow meter module 116, drives the impeller in the module to rotate, the sensor assembly receives the information, thereby measuring the water inlet flow. The water then flows to the second air inlet 1112 through the second water inlet channel 118, and then enters the dishwasher inner cavity. This allows the user to know the water inlet condition in real time, facilitates troubleshooting and maintenance, and ensures that the water flow can smoothly enter the dishwasher inner cavity, thereby improving the washing effect.

[0065] The above has carried on the detailed introduction to the application, the principle and implementation mode of the application are described by applying specific examples in this paper. The above example is only used to help understand the application and the core idea. It should be pointed out that for ordinary skilled person in the art, without departing from the principle of the application, the application can be improved and modified. These improvements and modifications also fall within the protection scope of the claims of the application.

Claims

1. A structure of an air suction of a dishwasher, characterized in that, The application relates to a ventilator (1) comprising a shell (11); an air extraction mechanism (2) in communication with the ventilator (1), the air extraction mechanism (2) being arranged below the ventilator (1); the shell (11) is provided with a through hole and an air duct (112), the air extraction mechanism (2) is in communication with the through hole through the air duct (112), and the air extraction mechanism (2) is used for extracting gas in the air duct (112).

2. The air extraction structure of the dish washing machine according to claim 1, wherein the air duct (112) is provided with a communication port (1124), the air extraction mechanism (2) is in communication with the air duct (112) through the communication port (1124); and the bottom of the air duct (112) is provided with a drainage port (1121), and the end of the air duct (112) provided with the drainage port (1121) is in an arc structure.

3. The air extraction structure of the dish washing machine according to claim 1, wherein the air duct (112) is provided with a condensation air duct, the condensation air duct is used for condensing gas in the air duct (112), and the condensation air duct is a duct composed of a plurality of reinforcing ribs (1122), and the reinforcing ribs (1122) are arranged at intervals.

4. The air extraction structure of the dish washing machine according to claim 1, wherein the through hole comprises a first air inlet (1111) and a second air inlet (1112), the second air inlet (1112) is located below the first air inlet (1111), and the air extraction mechanism (2) is in communication with the first air inlet (1111) through the air duct (112); the aperture of the first air inlet (1111) is R1, the aperture of the second air inlet (1112) is R2, and R1=R2.

5. The air extraction structure of the dish washing machine according to claim 4, wherein the air duct (112) is further provided with a first check piece (1123), the first check piece (1123) is used for guiding liquid in the condensation air duct out of the first air inlet (1111); and the first check piece (1123) is higher than the lowest point of the first air inlet (1111).

6. The air extraction structure of the dish washing machine according to claim 2, wherein the air extraction mechanism (2) comprises a blower shell (21) and a blower (22), and the blower (22) is mounted in the blower shell (21); the blower shell (21) is provided with a ventilation port (211), and the ventilation port (211) is in communication with the communication port (1124); and the side of the blower shell (21) away from the ventilation port (211) is provided with an air outlet (212), the air outlet (212) is in communication with the ventilation port (211), and the air outlet (212) is used for discharging gas out of the blower shell (21).

7. The air extraction structure of the dish washing machine according to claim 6, wherein ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The ventilation opening (211) is provided with an annular protrusion (23) facing the communication opening (1124), the blower housing (21) communicates with the communication opening (1124) through the annular protrusion (23), and the annular protrusion (23) is at least partially located in the communication opening (1124); The annular protrusion (23) is arranged obliquely.

8. The air extraction structure of the dish washing machine according to claim 4, characterized in that, The shell (11) is further provided with an exhaust air passage (113) which communicates with the air duct (112), and the exhaust air passage (113) is located between the first air inlet (1111) and the second air inlet (1112); The exhaust air passage (113) is provided with a condensation passage formed by a plurality of condensation ribs (1131), and the condensation passage is used for condensing water vapor in the dish washing machine to realize gas-liquid separation.

9. The air extraction structure of the dish washing machine according to claim 8, characterized in that, The exhaust air passage (113) is further provided with a second check piece (1132), the second check piece (1132) is located on the side of the second air inlet (1112) away from the first air inlet (1111), and the second check piece (1132) is used for guiding the liquid entering the condensation passage out of the second air inlet (1112); The condensation passage is used for condensing the gas in the exhaust air passage (113), and the second check piece (1132) is higher than the lowest point of the second air inlet (1112).

10. The air extraction structure of the dish washing machine according to claim 4, characterized in that, The shell (11) is further provided with a drain passage (114) having a drain water outlet (1141) at one end and a drain water inlet (1142) at the other end, and the drain passage (114) is located below the second air inlet (1112); The shell (11) is further provided with a water blocking piece (115) and an air hole, the water blocking piece (115) is located above the side of the drain passage (114), and the water blocking piece (115) is used for limiting the air hole.

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