Refrigerator drain assembly and refrigerator

Abstract

The application provides a refrigerator drain pipe assembly and a refrigerator, and relates to the technical field of household appliances. The refrigerator drain pipe assembly comprises a drain pipe, a drain valve and an air inlet valve arranged on the drain pipe. Two open ends of the drain pipe are respectively a water inlet and a drain outlet. The drain valve cooperates with the drain outlet. The side wall of the drain pipe is provided with an air inlet, which is in communication with the inner cavity of the drain pipe. The air inlet valve cooperates with the air inlet. The refrigerator drain pipe assembly separates the functions of water drainage and air ventilation. After the door of the refrigerator is opened again, the air pressure inside and outside the refrigerator can be quickly balanced, and the door can be opened without effort. During the refrigeration process of the refrigerator, the external hot and humid air is effectively prevented from entering the compartment or the evaporator chamber through the drain pipe, the reliability of the drain pipe is improved, and the energy consumption of the refrigerator is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of household appliances, in particular to a refrigerator drain pipe assembly and a refrigerator. BACKGROUND

[0002] At present, all the air-cooled refrigerators on the market are provided with an automatic defrosting function. The defrosting heater heats the evaporator to defrost, and the defrosting water is discharged to the water pan through the drain pipe. The structure of the drain pipe is directly connected with the humid hot air near the water pan. When the refrigerator is not defrosting, the humid hot air near the drain pipe enters the evaporator chamber through the drain pipe, exchanges heat with the cold air in the evaporator chamber, and increases the energy consumption of the refrigerator. In addition, the humid hot air near the drain pipe directly enters the evaporator chamber and is likely to freeze on the surface of the cold evaporator, which increases the defrosting reliability risk of the refrigerator and further increases the energy consumption of the refrigerator when defrosting.

[0003] In order to eliminate the influence of the drain pipe on the energy consumption, a water seal is arranged at the drain port in related technology. However, when the user opens the door and closes it again, the outside humid hot air enters the cabinet air and rapidly cools down, which causes the indoor and outdoor instantaneous negative pressure to be large, and it is very laborious to open the door again. If the water seal structure of the drain pipe structure stores water, an abnormal sound is easily generated when the door is opened, which affects the user experience.

[0004] In view of the above problems, CN206469571U, a refrigerator drain pipe assembly and a refrigerator, discloses a drain pipe, an air inlet pipe is arranged on the drain pipe, and a water seal structure is arranged at the end of the drain pipe and connected with the water pan. A floating ball structure is arranged in the air inlet pipe to balance the air pressure inside and outside, but because the air inlet pipe is arranged on the drain pipe, defrosting water is likely to enter the air inlet pipe, which affects the opening and closing effect of the floating ball valve. SUMMARY

[0005] The refrigerator drain pipe assembly and the refrigerator provided by the embodiments of the present application separate the functions of draining and ventilating, can quickly balance the air pressure inside and outside the refrigerator after the door of the refrigerator is opened and closed again, and the door is not laborious to open. At the same time, the external humid hot air is effectively blocked from entering the compartment or the evaporator chamber through the drain pipe during the refrigeration process of the refrigerator, the reliability of the drain pipe is improved, the energy consumption of the refrigerator is reduced, and the problems of laborious opening of the door of the existing refrigerator and generation of an abnormal sound are solved.

[0006] In a first aspect, the embodiments of the present application provide a refrigerator drain pipe assembly, which comprises a drain pipe, a drain valve arranged on the drain pipe and matched with a drain port, and an air inlet valve arranged on the drain pipe and matched with an air inlet port.

[0007] Two open ends of the drain pipe are respectively a water inlet and a drain port, a side wall of the drain pipe is provided with an air inlet port, and the air inlet port is connected with an inner cavity of the drain pipe;

[0008] When defrosting water flows through the drain pipe, the defrosting water impacts the drain valve, and the drain valve is opened; when no defrosting water is discharged, the drain valve seals the drain port by its own gravity.

[0009] When the refrigerator door is not opened or opened for a long time, the air inlet valve is in a closed state; when the refrigerator door is opened at the moment, the air inlet valve is opened, and after a period of time, the air inlet valve is automatically closed by gravity.

[0010] In a feasible implementation, the drain valve includes a first movable part, the first movable part is matched with the drain port, and the first movable part is rotationally connected with the drain pipe.

[0011] When no defrosting water is discharged, the first movable part seals the drain port, and the drain valve is closed; when defrosting water flows through the drain pipe, the defrosting water impacts the first movable part, the first movable part rotates to separate from the drain port, and the drain valve is opened.

[0012] In a feasible implementation, the drain valve further includes a first connecting part, the first connecting part is fixedly connected with the first movable part, and the first connecting part is rotationally connected with the drain pipe.

[0013] In a feasible implementation, the two outer walls of the drain pipe are each provided with a connecting hole.

[0014] The first connecting part includes a connecting shaft, the first movable part includes a movable baffle, the two connecting shafts are oppositely arranged on one side of the movable baffle facing the drain pipe, and the two connecting shafts are respectively rotationally connected with the two connecting holes.

[0015] When no defrosting water is discharged, the movable baffle seals the drain port, and the drain valve is closed; when defrosting water flows through the drain pipe, the defrosting water impacts the movable baffle, the movable baffle drives the connecting shaft to rotate, the movable baffle separates from the drain port, and the drain valve is opened.

[0016] In a feasible implementation, the air inlet valve includes a second movable part.

[0017] The second movable part is matched with the air inlet port, and the second movable part is rotationally connected with a side of the air inlet port.

[0018] When the refrigerator door is not opened or opened for a long time, the second movable part is located in the air inlet to block the air inlet, and the air inlet valve is in a closed state; when the refrigerator door is opened, the second movable part rotates under the action of external air pressure to open the air inlet, and the air inlet valve is in an open state; after air pressure balance, the second movable part resets under its own gravity to re-block the air inlet, and the air inlet valve is automatically closed.

[0019] In a feasible implementation, the air inlet valve further comprises an abutting part, which is fixed to the outer wall of the drain pipe;

[0020] When the second movable part blocks the air inlet, the second movable part abuts against the abutting part.

[0021] In a feasible implementation, the abutting part comprises a valve fixed plate, and the second movable part comprises a valve movable plate;

[0022] The valve fixed plate is fixed to the outer wall of the drain pipe, and the valve fixed plate is provided with a through hole corresponding to the air inlet;

[0023] The top end of the valve movable plate is rotationally connected to the top inner wall of the air inlet;

[0024] When the refrigerator door is not opened or opened for a long time, the valve movable plate is located in the air inlet and abuts against the valve fixed plate to block the air inlet, and the air inlet valve is in a closed state; when the refrigerator door is opened, the valve movable plate rotates under the action of external air pressure to open the air inlet, and the air inlet valve is in an open state; after air pressure balance, the valve movable plate resets under its own gravity to re-block the air inlet, and the air inlet valve is automatically closed.

[0025] In a feasible implementation, the inner wall of the drain pipe is fixed with a flow guide plate corresponding to the air inlet;

[0026] The flow guide plate and one side inner wall of the drain pipe enclose a cavity, the open end of the cavity faces the drain outlet, and the air inlet valve is located on the cavity;

[0027] The flow guide plate and the other side inner wall of the drain pipe enclose a drain passage, and the flow guide plate blocks the drain passage and the air inlet valve.

[0028] In a feasible implementation, the refrigerator drain pipe assembly further comprises a defrosting water pipe, one end of the defrosting water pipe is in communication with the water inlet of the drain pipe.

[0029] In an implementable manner, the refrigerator drain pipe assembly further comprises a sealing sponge arranged between the defrosting water pipe and the drain pipe.

[0030] In a second aspect, the embodiments of the present application provide a refrigerator comprising the refrigerator drain pipe assembly.

[0031] The refrigerator drain pipe assembly provided by the embodiments of the present application has the following advantages:

[0032] The side wall of the drain pipe is provided with an air inlet, and the air inlet is in communication with the inner cavity of the drain pipe. The drain pipe is provided with an air inlet valve matched with the air inlet. When the refrigerator door is not opened or is opened for a long time, the air inlet valve is in a closed state. When the refrigerator door is opened at the moment, the air inlet valve is opened. After a period of time, the air inlet valve is automatically closed by gravity.

[0033] The refrigerator drain pipe assembly provided by the embodiments of the present application separates the functions of drainage and air passage. After the refrigerator door is opened and closed again, the air pressure inside and outside the refrigerator can be quickly balanced, and the door can be opened without effort. At the same time, during the refrigeration process of the refrigerator, the external hot and humid air is effectively blocked from entering the compartment or the evaporator chamber through the drain pipe, thereby improving the reliability of the drain pipe and reducing the energy consumption of the refrigerator.

[0034] The embodiments of the present application have the following advantages:

[0035] 1. The functions of drainage and air passage are separated. After the refrigerator door is opened and closed again, the air pressure inside and outside the refrigerator can be quickly balanced, and the door can be opened without effort.

[0036] 2. The air inlet valve and the drain valve in the drain pipe assembly realize the opening and closing of the air inlet and the drain outlet by relying on their own gravity, which is simple in structure, tight in sealing, low in cost and does not change the existing production line installation process.

[0037] 3. The inside of the air inlet of the drain pipe is provided with a flow guide plate. The defrosting water flows out along the flow guide plate, preventing the defrosting water from flowing into the air inlet and affecting the normal opening and closing of the air inlet valve, thereby improving the reliability. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 FIG. 1 is a structural schematic diagram of a refrigerator drain pipe assembly provided by the embodiments of the present application;

[0039] Figure 2 FIG. 3 is an exploded view of the drain pipe and its connecting structure;

[0040] Figure 3 FIG. 5 is a sectional view of the drain pipe assembly along the A-A plane.

[0041] Figure 4 is a sectional view of the drain pipe assembly B-B plane;

[0042] Figure 5 is a sectional view of the drain pipe assembly C-C plane.

[0043] Explanation of reference signs:

[0044] 1 - drain pipe; 2 - drain valve; 3 - air inlet valve; 4 - sealing sponge; 5 - defrosting water pipe;

[0045] 11 - water inlet; 12 - drain outlet; 13 - connecting hole; 14 - air inlet; 15 - guide plate; 21 - connecting shaft; 22 - movable baffle; 31 - valve fixed plate; 32 - valve movable plate; 33 - through hole. DETAILED DESCRIPTION

[0046] In order for those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should be within the scope of protection of the present application.

[0047] At present, the air-cooled refrigerator on the market is provided with an automatic defrosting function. The defrosting heater heats the evaporator to defrost, and the defrosting water is discharged to the water pan through the drain pipe. The structure of the drain pipe is directly communicated with the humid hot air near the water pan. When the refrigerator is not defrosting, the humid hot air near the drain pipe enters the evaporator chamber through the drain pipe, exchanges heat with the cold air in the evaporator chamber, and increases the energy consumption of the refrigerator. In addition, the humid hot air near the drain pipe directly enters the evaporator chamber and is extremely easy to frost and freeze on the surface of the evaporator, increasing the defrosting reliability risk of the refrigerator and further increasing the energy consumption of the refrigerator when defrosting. In order to eliminate the influence of the drain pipe on the energy consumption, a water seal is arranged at the drain port in related technology, but when the user opens the door and closes it again, the outside humid hot air enters the air in the chamber and rapidly cools down, causing the instantaneous negative pressure between the inside and outside of the chamber to become large, resulting in that it is very laborious to open the door again. If the water seal structure of the drain pipe structure stores water, an abnormal sound is easily generated when the door is opened, affecting the user experience.

[0048] In view of the above problems, CN206469571U, a kind of refrigerator drain pipe assembly and refrigerator, disclose a kind of drain pipe, air inlet pipe is arranged on drain pipe, drain pipe end sets up water seal structure and is connected with water pan. Float ball structure is arranged in air inlet pipe to balance the air pressure inside and outside, but because air inlet pipe is arranged on drain pipe, defrosting water is easy to enter air inlet pipe, which affects the opening and closing effect of float ball valve.

[0049] The refrigerator drain pipe assembly provided by the application separates the drainage and ventilation functions, can quickly balance the air pressure inside and outside the refrigerator when the refrigerator door is opened again after being opened, and does not require much effort to open the door. Meanwhile, the refrigerator drain pipe assembly effectively prevents the external hot and humid air from entering the compartment or the evaporator chamber through the drain pipe during the refrigeration process of the refrigerator, improves the reliability of the drain pipe, and reduces the energy consumption of the refrigerator.

[0050] The specific structure of the refrigerator drain pipe assembly provided by the application will be described in detail below with reference to the accompanying drawings.

[0051] Referring to Figures 1-5 The refrigerator drain pipe assembly provided by the application includes;

[0052] The drain pipe 1 can be a conventional water pipe, and the drain pipe 1 is vertically arranged. Two open ends of the drain pipe 1 are respectively a water inlet 11 and a drain outlet 12. An air inlet 14 is arranged on the side wall of the drain pipe 1, and the air inlet 14 is in communication with the inner cavity of the drain pipe 1.

[0053] As shown in Figure 1 The upper end of the drain pipe 1 is the water inlet 11, and the bottom end is the drain outlet 12. The air inlet 14 is arranged on the right side surface of the middle part of the drain pipe 1, and the air inlet 14 can be a rectangular through hole.

[0054] The drain valve 2 is arranged on the drain pipe 1 and cooperates with the drain outlet 12. The drain valve 2 is arranged at the bottom end of the drain pipe 1. In a natural state, the drain valve 2 blocks the drain outlet 12 of the drain pipe 1 by its own gravity. When the defrosting water flows through the drain pipe 1, the defrosting water impacts the drain valve 2, so that the drain valve 2 is opened. When there is no defrosting water to be discharged, the drain valve 2 seals the drain outlet 12 by its own gravity.

[0055] The air inlet valve 3 is arranged on the drain pipe 1 and cooperates with the air inlet 14. The air inlet valve 3 is arranged on the air inlet 14 of the drain pipe 1. In a natural state, the air inlet valve 3 blocks the air inlet 14 of the drain pipe 1 by its own gravity. When the refrigerator door is not opened or is opened for a long time, the air inlet valve 3 is in a closed state. When the refrigerator door is opened, the air inlet valve 3 is opened. After a period of time, the air inlet valve 3 is automatically closed by gravity.

[0056] Referring to Figures 2-5 In some embodiments, the drain valve 2 includes a first movable part that cooperates with the drain outlet 12, and the first movable part is rotationally connected with the drain pipe 1.

[0057] When no defrosting water is discharged, the first movable part seals the drain port 12, and the drain valve 2 is closed; when defrosting water flows through the drain pipe 1, the defrosting water impacts the first movable part, the first movable part rotates to separate from the drain port 12, and the drain valve 2 is opened.

[0058] Further, in some embodiments, the drain valve 2 further comprises a first connecting part, which is fixedly connected with the first movable part, and the first connecting part is rotatably connected with the drain pipe 1.

[0059] Specifically, in some embodiments, the outer walls on both sides of the drain pipe 1 are provided with connecting planes, and connecting holes 13 are oppositely arranged on the two connecting planes. The connecting holes 13 can be circular blind holes, as shown in Figure 2 The bottom end of the drain pipe 1 is a slope, the left end of the bottom surface is low, and the right end is high, and the inclination angle can be 30°;

[0060] The first connecting part comprises connecting shafts 21 matched with the connecting holes 13, and the first movable part comprises an active baffle 22, which can be an oval plate body or a rectangular plate body. The active baffle 22 can completely block the drain port 12. The two connecting shafts 21 are oppositely arranged on the side of the active baffle 22 facing the drain pipe 1. The bottom ends of the two connecting shafts 21 are fixedly connected with the right end of the active baffle 22, and the top parts of the two connecting shafts 21 are rotatably connected with the two connecting holes 13 respectively.

[0061] The thickness of the right side of the active baffle 22 is large and the mass is high. When the top part of the connecting shaft 21 is rotatably connected with an object, when it reaches a balanced state, the active baffle 22 will be in an inclined state with the left end high and the right end low. The bottom surface of the drain pipe 1 is a slope with the left end low and the right end high. Therefore, when no defrosting water is discharged, the active baffle 22 will adhere to the bottom surface of the drain pipe 1 under the action of its own gravity, blocking the drain port 12. At this time, the drain valve 2 is closed, reaching Figure 3 and Figure 4 state;

[0062] When defrosting water flows through the drain pipe 1, the defrosting water impacts the active baffle 22, the active baffle 22 drives the connecting shaft 21 to rotate to the right, and the active baffle 22 separates from the drain port 12. At this time, the drain valve 2 is opened, reaching Figure 5 state.

[0063] Referring to Figures 2-5 In some embodiments, the air inlet valve 3 comprises a second movable part;

[0064] The second movable part is matched with the air inlet port 14, and the second movable part is rotatably connected with the edge of the air inlet port 14.

[0065] When the refrigerator door is not opened or opened for a long time, the second movable part is located in the air inlet 14 to block the air inlet 14, and the air inlet valve 3 is in a closed state; when the refrigerator door is opened, the second movable part rotates under the action of external air pressure to open the air inlet 14, and the air inlet valve 3 is in an open state; after air pressure balance, the second movable part resets under its own gravity to reseal the air inlet 14, and the air inlet valve 3 is automatically closed.

[0066] Further, in some embodiments, the air inlet valve 3 further comprises an abutting part which is fixed to the outer wall of the drain pipe 1.

[0067] When the second movable part blocks the air inlet 14, the second movable part abuts against the abutting part.

[0068] Specifically, in some embodiments, at least part of the outer wall of the drain pipe 1 is a vertical plane, and the air inlet 14 is arranged on the vertical plane.

[0069] The abutting part comprises a valve fixed plate 31 which can be a rectangular plate body and has a size greater than that of the air inlet 14, the valve fixed plate 31 is fixed to the vertical plane of the drain pipe 1, and the valve fixed plate 31 is provided with a through hole 33 corresponding to the air inlet 14, the through hole 33 can be rectangular and slightly smaller than the air inlet 14.

[0070] The second movable part comprises a valve movable plate 32 which is a rectangular plate body matching the air inlet 14, the top end side wall of the valve movable plate 32 is rotationally connected to the top inner wall of the air inlet 14 through a rotating shaft, so that the lower part of the valve movable plate 32 can swing left and right, and because the size of the valve movable plate 32 is greater than that of the through hole 33, the right side of the valve movable plate 32 abuts against the left side of the valve fixed plate 31, so that the valve movable plate 32 can only rotate towards the inside of the drain pipe 1.

[0071] When the valve movable plate 32 is in a vertical state, the valve movable plate 32 is located in the air inlet 14 to block the air inlet 14, so that external air cannot enter the drain pipe 1, at this time the air inlet valve 3 is in a closed state; when the valve movable plate 32 rotates towards the inside of the drain pipe 1 and separates from the air inlet 14, the air inlet 14 is opened, and external air enters the drain pipe 1 through the through hole 33 and the air inlet 14 in turn and enters the refrigerator, at this time the air inlet valve 3 is in an open state.

[0072] Specifically, when the refrigerator door is not opened or opened for a long time, the air pressure inside and outside the drain pipe 1 is balanced, the valve movable plate 32 enters the air inlet 14 under the action of its own gravity, abuts against the valve fixed plate 31, blocks the air inlet 14, and the air inlet valve 3 is in a closed state; when the refrigerator door is opened, the valve movable plate 32 rotates into the drain pipe 1 under the action of external air pressure, so that the air inlet 14 is opened, and the air inlet valve 3 is in an open state; after air pressure balance, the valve movable plate 32 resets under the action of its own gravity, re-blocks the air inlet 14, and the air inlet valve 3 is automatically closed.

[0073] Referring to Figure 3 As shown in the drawings, in some embodiments, the inner wall of the drain pipe 1 is fixedly provided with a flow guide plate 15 corresponding to the air inlet 14;

[0074] The flow guide plate 15 can be an L-shaped plate body, which includes a semicircular inclined plate body and a rectangular vertical plate body. The arc portion of the outer end of the semicircular inclined plate body is fixedly connected with the inner wall of the drain pipe 1, the straight portion of the outer end of the semicircular inclined plate body is connected with the top end of the rectangular vertical plate body, the rectangular vertical plate body is vertically arranged, and the front and rear ends of the rectangular vertical plate body are fixedly connected with the inner wall of the drain pipe 1. The flow guide plate 15 and one side of the inner wall of the drain pipe 1 form a cavity, the open end of the cavity faces the drain port 12, the air inlet valve 3 is located on the cavity, the valve movable plate 32 rotates into the cavity and abuts against the flow guide plate 15;

[0075] The flow guide plate 15 and the other side of the inner wall of the drain pipe 1 form a drain passage, and the flow guide plate 15 blocks the drain passage and the air inlet valve 3;

[0076] The defrosting water flows through the drain passage, preventing the defrosting water from flowing into the air inlet and affecting the normal opening and closing of the air inlet valve. At the same time, the flow guide plate 15 limits the valve movable plate 32 in the structure of the air inlet valve.

[0077] Referring to Figure 1 As shown in the drawings, in some embodiments, the refrigerator drain pipe assembly further comprises a defrosting water pipe 5, which comprises a straight pipe body and a collection cover body. The collection cover body is arranged at the top of the straight pipe body, and the bottom of the straight pipe body is in communication with the water inlet 11 of the drain pipe 1, thereby facilitating the discharge of defrosting water.

[0078] Further, in some embodiments, the refrigerator drain pipe assembly further comprises a sealing sponge 4 arranged between the defrosting water pipe 5 and the drain pipe 1, thereby ensuring the sealing between the defrosting water pipe 5 and the drain pipe 1.

[0079] According to the above technical features, the working principle of the refrigerator drain pipe assembly provided by the present application in the actual application scene is:

[0080] When the refrigerator drain pipe assembly is installed, in the natural state, the movable baffle 22 adheres to the bottom surface of the drain pipe 1 under the action of its own gravity, blocking the drain port 12, at this time, the drain valve 2 is in the closed state; the valve movable plate 32 is in the vertical state, located in the air inlet 14, blocking the air inlet 14, so that external air cannot enter the drain pipe 1, at this time, the air inlet valve 3 is in the closed state.

[0081] When the defrosting water flows through the drain pipe 1, the defrosting water impacts the movable baffle 22, the movable baffle 22 drives the connecting shaft 21 to rotate to the right, and the movable baffle 22 is separated from the drain port 12, at this time, the drain valve 2 is in the open state; after the defrosting water is discharged from the drain pipe 1, the movable baffle 22 resets under the action of its own gravity, re-blocking the drain port 12, and the drain valve 2 returns to the closed state.

[0082] When the refrigerator door is opened at the moment, the valve movable plate 32 rotates into the drain pipe 1 under the action of external air pressure, so that the air inlet 14 is opened, and the air inlet valve 3 is in the open state; when the refrigerator door is not opened or opened for a long time, the air pressure inside and outside the drain pipe 1 is balanced, the valve movable plate 32 enters the air inlet 14 under the action of its own gravity, abuts against the valve fixed plate 31, blocks the air inlet 14, and the air inlet valve 3 is in the closed state.

[0083] The refrigerator drain pipe assembly provided in the application separates the drainage and ventilation functions, can quickly balance the air pressure inside and outside the refrigerator after the refrigerator door is opened again after being opened and closed, and does not require effort to open the door. At the same time, during the refrigerator refrigeration process, external hot and humid air is effectively blocked from entering the compartment or the evaporator chamber through the drain pipe, the reliability of the drain pipe is improved, and the energy consumption of the refrigerator is reduced.

[0084] The application also provides a refrigerator comprising the above-mentioned refrigerator drain pipe assembly.

[0085] It is easy to understand that, on the basis of the several embodiments provided in the application, a person skilled in the art can combine, split, recombine, etc. the embodiments of the application to obtain other embodiments, and these embodiments do not exceed the protection scope of the application.

[0086] The above specific embodiments have further detailed the purposes, technical solutions and beneficial effects of the embodiments of the application, and it should be understood that the above is only a specific implementation of the embodiments of the application, and is not used to limit the protection scope of the embodiments of the application, and any modification, equivalent replacement, improvement, etc. made on the basis of the technical solutions of the embodiments of the application should be included in the protection scope of the embodiments of the application.

Claims

1. A refrigerator drain pipe assembly, characterized in that: include; Drainage pipe (1), the two open ends of the drainage pipe (1) are water inlet (11) and drain outlet (12) respectively, and the side wall of the drainage pipe (1) is provided with air inlet (14), which is connected to the inner cavity of the drainage pipe (1); A drain valve (2) is installed on the drain pipe (1) and cooperates with the drain outlet (12). When defrosting water flows through the drain pipe (1), the defrosting water impacts the drain valve (2), causing the drain valve (2) to open. When no defrosting water is discharged, the drain valve (2) seals the drain outlet (12) by its own weight. An air inlet valve (3) is installed on the drain pipe (1) and cooperates with the air inlet (14). When the refrigerator door is not opened or has been open for a long time, the air inlet valve (3) is closed. When the refrigerator door is opened, the air inlet valve (3) opens and after a period of time, the air inlet valve (3) closes automatically by gravity. The drain pipe (1) has connection holes (13) on both outer walls. The drain valve (2) includes a first movable part, which cooperates with the drain outlet (12) and is rotatably connected to the drain pipe (1); the drain valve (2) also includes a first connecting part, which is fixedly connected to the first movable part and is rotatably connected to the drain pipe (1). The first connecting part includes a connecting shaft (21), the first movable part includes a movable baffle (22), the two connecting shafts (21) are disposed opposite to each other on the side of the movable baffle (22) facing the drain pipe (1), and the two connecting shafts (21) are rotatably connected to the two connecting holes (13) respectively. When no defrost water is discharged, the movable baffle (22) seals the drain outlet (12) and the drain valve (2) is closed; when defrost water flows through the drain pipe (1), the defrost water impacts the movable baffle (22), the movable baffle (22) drives the connecting shaft (21) to rotate, the movable baffle (22) disengages from the drain outlet (12), and the drain valve (2) opens; The intake valve (3) includes a second movable part; The second movable part is matched with the air inlet (14), and the second movable part is rotatably connected to the edge of the air inlet (14); the air inlet valve (3) also includes an abutment part, which is fixed to the outer wall of the drain pipe (1); When the second movable part blocks the air inlet (14), the second movable part abuts against the abutting part; The abutting part includes a valve fixing plate (31), and the second movable part includes a valve movable plate (32). The valve fixing plate (31) is fixed to the outer wall of the drain pipe (1), and the valve fixing plate (31) is provided with a through hole (33) corresponding to the air inlet (14). The top of the valve movable plate (32) is rotatably connected to the top inner wall of the air inlet (14); When the refrigerator door is not opened or has been open for a long time, the valve movable plate (32) is located inside the air inlet (14) and abuts against the valve fixed plate (31), blocking the air inlet (14), and the air inlet valve (3) is in the closed state; when the refrigerator door is opened, the valve movable plate (32) rotates under the action of external air pressure, causing the air inlet (14) to open, and the air inlet valve (3) is in the open state; after the air pressure is balanced, the valve movable plate (32) resets under its own gravity, re-blocking the air inlet (14), and the air inlet valve (3) automatically closes; The inner wall of the drain pipe (1) is fixed with a guide plate (15), which corresponds to the air inlet (14); The guide plate (15) and the inner wall of one side of the drain pipe (1) form a cavity, the open end of the cavity faces the drain outlet (12), and the air inlet valve (3) is located on the cavity; The guide plate (15) and the inner wall of the drain pipe (1) on the other side form a drainage channel, and the guide plate (15) blocks the drainage channel and the air inlet valve (3).

2. The refrigerator drain pipe assembly according to claim 1, characterized in that: When no defrost water is discharged, the first movable part seals the drain outlet (12) and the drain valve (2) is closed; when defrost water flows through the drain pipe (1), the defrost water impacts the first movable part, and the first movable part rotates away from the drain outlet (12), causing the drain valve (2) to open.

3. The refrigerator drain pipe assembly according to claim 1, characterized in that: When the refrigerator door is not opened or has been open for a long time, the second movable part is located inside the air inlet (14) and blocks the air inlet (14), and the air inlet valve (3) is in the closed state; when the refrigerator door is opened, the second movable part rotates under the action of external air pressure, causing the air inlet (14) to open, and the air inlet valve (3) to be in the open state; after the air pressure is balanced, the second movable part resets under its own gravity and re-blocks the air inlet (14), and the air inlet valve (3) automatically closes.

4. The refrigerator drain pipe assembly according to claim 1, characterized in that: The refrigerator drain pipe assembly also includes a defrost pipe (5) and a sealing sponge (4). One end of the defrosting water pipe (5) is connected to the inlet (11) of the drain pipe (1); The sealing sponge (4) is placed between the defrosting water pipe (5) and the drain pipe (1).

5. A refrigerator, characterized in that: Includes the refrigerator drain pipe assembly as described in any one of claims 1-4.

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