Refrigerator drainage system and refrigerator

Abstract

The application provides a refrigerator drainage system and a refrigerator. The refrigerator drainage system comprises defrosting water pipes, an air inlet valve and a drainage pipe arranged on the defrosting water pipes. The side wall of the defrosting water pipes is provided with a first air inlet, and the first air inlet is provided with an air inlet valve. The air inlet valve is used for opening or closing the first air inlet. A drainage pipe with a certain elasticity is arranged on the defrosting water pipes. The drainage pipe comprises an elastic deformation part and a connecting part. When no defrosting water flows through the drainage pipe, the elastic deformation part is in a closed state. When defrosting water flows through the drainage pipe, the elastic deformation part is opened under the impact of the defrosting water. In the application, the drainage and ventilation functions are separated. After the door of the refrigerator 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. Meanwhile, in the refrigeration process of the refrigerator, the external humid hot air is effectively prevented from entering the compartment or the evaporator chamber through the drainage pipe, the reliability of the drainage pipe is improved, and the operation 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 drainage system and a refrigerator. BACKGROUND

[0002] At present, all the air-cooled refrigerators on the market are equipped with automatic defrosting function. The defrosting heater heats the evaporator to defrost, and the defrosting water is discharged to the water pan through the drainage pipe. The structure of the drainage 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 drainage pipe enters the evaporator room through the drainage pipe, exchanges heat with the cold air in the evaporator room, and increases the energy consumption of the refrigerator. In addition, the humid hot air near the drainage pipe directly enters the evaporator room and meets the cold evaporator, which is prone to frost and ice on the surface of the evaporator, increasing the defrosting reliability risk of the refrigerator and further increasing the energy consumption of the refrigerator during defrosting.

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

[0004] In view of the above problems, CN206469571U discloses a refrigerator drainage pipe assembly and a refrigerator. A drainage pipe is provided with an air inlet pipe, and a water seal structure is arranged at the end of the drainage 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 the pipe. However, since the air inlet pipe is arranged on the drainage pipe, defrosting water is easy to enter the air inlet pipe, affecting the opening and closing effect of the floating ball valve. SUMMARY

[0005] The refrigerator drainage system and the refrigerator provided by the embodiments of the present application separate the drainage and ventilation functions, can quickly balance the air pressure inside and outside the refrigerator after the door of the refrigerator is opened and closed again, and does not require much effort to open the door. In addition, the external humid hot air is effectively blocked from entering the compartment or the evaporator room through the drainage pipe during the refrigeration process of the refrigerator, improving the reliability of the drainage pipe, reducing the energy consumption of the refrigerator, and solving the problems of laborious opening of the door of the existing refrigerator and generation of abnormal sound.

[0006] In a first aspect, the embodiments of the present application provide a refrigerator drainage system, which comprises:

[0007] A defrosting water pipe, two open ends of the defrosting water pipe are respectively a first water inlet and a first water outlet, and a side wall of the defrosting water pipe is provided with a first air inlet, which is in communication with an inner cavity of the defrosting water pipe;

[0008] An air inlet valve arranged on the defrosting water pipe, the air inlet valve is arranged on the first air inlet, and the air inlet valve is configured to open or close the first air inlet.

[0009] The drainage pipe with elasticity is a hose, and the drainage pipe comprises an elastic deformation part and a connecting part. One end of the connecting part is a second water inlet, the second water inlet is connected with the first water outlet, the other end of the connecting part is connected with one end of the elastic deformation part, and the other end of the elastic deformation part is a second water outlet.

[0010] When no defrosting water flows through the drainage pipe, the elastic deformation part is in a closed state; when defrosting water flows through the drainage pipe, the elastic deformation part is opened under the impact of the defrosting water.

[0011] In a feasible implementation, the elastic deformation part is a corrugated structure, a pipe gap of the elastic deformation part is A, and 0≤A≤1mm.

[0012] In a feasible implementation, the defrosting water pipe comprises a connecting pipe body, and the air inlet valve is arranged on the connecting pipe body.

[0013] One end of the connecting pipe body is detachably connected with the connecting part.

[0014] In a feasible implementation, the defrosting water pipe further comprises a collecting cover body.

[0015] The collecting cover body and the connecting pipe body are in an integrated structure, and the collecting cover body is located at the other end of the connecting pipe body.

[0016] The first water inlet is located in the collecting cover body.

[0017] In a feasible implementation, the air inlet valve comprises a movable part.

[0018] The movable part is matched with the first air inlet, and the movable part is rotationally connected with the edge of the first air inlet.

[0019] When the refrigerator door is not opened or is opened for a long time, the movable part is located in the first air inlet to block the first air inlet, and the air inlet valve is in a closed state; when the refrigerator door is opened at a moment, the movable part rotates under the action of external air pressure to open the first air inlet, and the air inlet valve is in an open state; after air pressure balance, the movable part resets under its own gravity to reseal the first air inlet, and the air inlet valve is automatically closed.

[0020] In a feasible implementation, the air inlet valve further comprises an abutting part, and the abutting part is fixedly arranged on the outer wall of the defrosting water pipe.

[0021] When the movable part blocks the first air inlet, the movable part abuts against the abutting part.

[0022] In a feasible implementation, the abutting part comprises a fixed plate, and the movable part comprises a movable plate;

[0023] The fixed plate is fixed to the outer wall of the defrosting water pipe, and the fixed plate is provided with a second air inlet corresponding to the first air inlet;

[0024] The top end of the movable plate is rotationally connected to the top inner wall of the first air inlet;

[0025] When the refrigerator door is not opened or opened for a long time, the movable plate is located in the first air inlet and abuts against the fixed plate to block the first air inlet, and the air inlet valve is in a closed state; when the refrigerator door is opened at the moment, the movable plate rotates under the action of external air pressure to open the first air inlet, and the air inlet valve is in an open state; after air pressure balance, the movable plate resets under its own gravity to reseal the first air inlet, and the air inlet valve is automatically closed.

[0026] In a feasible implementation, the inner wall of the defrosting water pipe is fixedly provided with a guide plate corresponding to the first air inlet;

[0027] The guide plate and one side inner wall of the defrosting water pipe enclose a cavity, the open end of the cavity faces the drain port, and the air inlet valve is located on the cavity;

[0028] The guide plate and the other side inner wall of the defrosting water pipe enclose a drain passage, and the guide plate blocks the drain passage and the air inlet valve.

[0029] In a feasible implementation, the movable plate is clamped with the guide plate.

[0030] In a second aspect, the embodiments of the present application provide a refrigerator comprising a cabinet and the above-mentioned refrigerator drain system.

[0031] The cabinet is provided with an evaporator chamber, the evaporator chamber is provided with a water pan, and the water inlet of the defrosting water pipe is in communication with the water pan.

[0032] The refrigerator drain system and the refrigerator provided by the embodiments of the present application are characterized in that a first air inlet is arranged on the side wall of the defrosting water pipe, an air inlet valve is arranged on the first air inlet, and the air inlet valve is used to open or close the first air inlet.

[0033] A drain pipe with a certain elasticity is arranged on the defrosting water pipe, the drain pipe comprises an elastic deformation part and a connecting part, when no defrosting water flows through the drain pipe, the elastic deformation part is in a closed state; when defrosting water flows through the drain pipe, the elastic deformation part is opened under the impact of the defrosting water;

[0034] The drainage and ventilation functions are separated, the air pressure inside and outside the refrigerator can be quickly balanced after the refrigerator is opened again after being opened, and the refrigerator is not laborious to open. Meanwhile, the external hot and humid air is effectively blocked from entering the compartment or the evaporator chamber through the drainage pipe during the refrigeration process of the refrigerator, the reliability of the drainage pipe is improved, and the energy consumption of the refrigerator is reduced.

[0035] The refrigerator drainage system provided by the application has the following advantages:

[0036] 1. The drainage and ventilation functions are separated, the air pressure inside and outside the refrigerator can be quickly balanced after the refrigerator is opened again after being opened, and the refrigerator is not laborious to open.

[0037] 2. The air inlet valve in the defrosting water pipe assembly realizes the opening and closing of the air inlet by relying on its own gravity, has simple structure, tight sealing, low cost and does not change the existing production line installation process.

[0038] 3. The water outlet of the drainage pipe adopts a corrugated structure, and realizes the opening and closing of the drainage port by relying on its own elasticity, preventing hot air from entering the refrigerator during normal refrigeration to increase energy consumption.

[0039] 4. The defrosting water flows out along the guide plate, preventing the defrosting water from flowing into the air inlet to affect the normal opening and closing of the air inlet valve, and improving the reliability. BRIEF DESCRIPTION OF DRAWINGS

[0040] Figure 1 is a structural schematic diagram of the refrigerator drainage system provided by the application;

[0041] Figure 2 is a sectional view of the refrigerator drainage system A-A;

[0042] Figure 3 is a sectional view of the refrigerator drainage system B-B;

[0043] Figure 4 is a sectional view of the refrigerator drainage system C-C.

[0044] Explanation of reference signs:

[0045] 1-defrosting water pipe; 2-air inlet valve; 3-drainage pipe;

[0046] 11-first water inlet; 12-first drainage port; 13-guide plate; 14-first air inlet; 15-collecting cover body; 16-connection pipe body; 21-fixed plate; 22-second air inlet; 23-movable plate; 31-elastic deformation part; 32-connection part; 33-second water inlet; 34-second drainage port. DETAILED DESCRIPTION

[0047] 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 in the following with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor should fall within the scope of protection of the present application.

[0048] The air-cooled refrigerator on the market currently all have 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 directly communicates 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 energy consumption, a water seal is arranged at the drain port in related technology, but when the user opens the door and then 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.

[0049] 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 easy to enter the air inlet pipe, affecting the opening and closing effect of the floating ball valve.

[0050] The refrigerator drain system provided by the present application separates 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 does not require labor to open the door. At the same time, the refrigerator drain system effectively blocks the external humid hot air from entering the chamber 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.

[0051] The specific structure of the refrigerator drain system and the refrigerator provided by the present application will be described in detail below with reference to the accompanying drawings.

[0052] Referring to Figures 1-4 The refrigerator drain system provided by the present application includes a defrosting water pipe 1, an air inlet valve 2 connected with the defrosting water pipe 1, and a drain pipe 3.

[0053] The defrosting water pipe 1 is vertically arranged, and two open ends of the defrosting water pipe 1 are respectively a first water inlet 11 and a first water outlet 12, that is, an upper end of the defrosting water pipe 1 is the first water inlet 11, and a lower end of the defrosting water pipe 1 is the first water outlet 12, defrosting water flows through the defrosting water pipe 1 from top to bottom, and a side wall of the defrosting water pipe 1 is provided with a first air inlet 14, the first air inlet 14 is in communication with an inner cavity of the defrosting water pipe 1, and the first air inlet 14 can be a rectangular through hole;

[0054] The air inlet valve 2 is arranged on the defrosting water pipe 1, and the air inlet valve 2 is arranged on the first air inlet 14 and configured to open or close the first air inlet 14;

[0055] When the refrigerator door is closed or opened for a long time, the air inlet valve 2 is in a closed state; when the refrigerator door body is opened at the moment, the air inlet valve 2 is opened, external air enters the defrosting water pipe 1 and enters the refrigerator, so that the refrigerator door body is easily opened;

[0056] The drain pipe 3 is a flexible pipe with a certain elasticity, and the drain pipe 3 includes an elastic deformation part 31 and a connecting part 32, the elastic deformation part 31 and the connecting part 32 are in an integrated structure, a top end of the connecting part 32 is a second water inlet 33, the second water inlet 33 is connected with the first water outlet 12, the other end of the connecting part 32 is connected with one end of the elastic deformation part 31, and a bottom end of the elastic deformation part 31 is a second water outlet 34;

[0057] At least part of the inner cavity of the elastic deformation part 31 is a flat cavity or a tight closed cavity, when no defrosting water flows through the drain pipe 3, the elastic deformation part 31 is in a closed state, so that external hot and humid air enters the refrigerator through the drain pipe 3 is avoided;

[0058] When the defrosting water flows through the drain pipe 3, the defrosting water impacts the elastic deformation part 31 of the drain pipe 3, so that the flat cavity or the tight closed cavity is opened, after the defrosting water is discharged from the drain pipe 3, the elastic deformation part 31 of the drain pipe 3 restores to the closed state under the elastic effect of itself.

[0059] Referring to Figure 1 In some embodiments, the elastic deformation part 31 is a corrugated structure, the corrugated structure has one or more bending points, the corrugated structure can be a “V” or “W” bending structure, a pipe gap of the elastic deformation part 31 is A, and 0≤A≤1mm;

[0060] Because the pipe gap of the elastic deformation part 31 is zero or very small, and the elastic deformation part 31 is a corrugated structure, at the bending position, the pipe gap of the elastic deformation part 31 is zero, so that external hot and humid air enters the refrigerator through the drain pipe 3 is avoided;

[0061] When the defrosting water flows through the elastic deformation part 31 of the drain pipe 3, the defrosting water impacts the elastic deformation part 31, so that the pipe gap of the elastic deformation part 31 is increased, and after the defrosting water is discharged from the drain pipe 3, the elastic deformation part 31 of the drain pipe 3 is restored to the closed state under the elastic force of the elastic deformation part 31.

[0062] Referring to Figure 2 As shown in the drawings, in some embodiments, the defrosting water pipe 1 comprises a connecting pipe body 16, the connecting pipe body 16 is a vertical pipe body, and the air inlet valve 2 is arranged on the connecting pipe body 16.

[0063] The bottom end of the connecting pipe body 16 is detachably connected with the top of the connecting part 32.

[0064] Further, in some embodiments, the defrosting water pipe 1 further comprises a collecting cover 15.

[0065] The collecting cover 15 can be a conical cover, the collecting cover 15 and the connecting pipe body 16 are an integral structure, and the collecting cover 15 is located at the top end of the connecting pipe body 16.

[0066] The first water inlet 11 is located in the collecting cover 15.

[0067] Referring to Figures 1-4 As shown in the drawings, in some embodiments, the air inlet valve 2 comprises a movable part.

[0068] The movable part is matched with the first air inlet 14, and the movable part is rotationally connected with the edge of the first air inlet 14.

[0069] When the refrigerator door is not opened or is opened for a long time, the movable part is located in the first air inlet 14 to block the first air inlet 14, and the air inlet valve 2 is in a closed state; when the refrigerator door is opened, the movable part is rotated under the action of the external air pressure to open the first air inlet 14, and the air inlet valve 2 is in an open state; after the air pressure is balanced, the movable part is reset under the action of its own gravity to block the first air inlet 14 again, and the air inlet valve 2 is automatically closed.

[0070] Further, in some embodiments, the air inlet valve 2 further comprises an abutting part, and the abutting part is fixedly arranged on the outer wall of the defrosting water pipe 1.

[0071] When the movable part blocks the first air inlet 14, the movable part abuts against the abutting part.

[0072] Specifically, in some embodiments, at least part of the outer wall of the connecting pipe body 16 is a vertical plane, and the first air inlet 14 is arranged on the vertical plane.

[0073] The abutting part comprises a fixed plate 21, which can be a rectangular plate body and has a size larger than the first air inlet 14. The fixed plate 21 is fixed on the vertical plane of the connecting pipe body 16, and the fixed plate 21 is provided with a second air inlet 22 corresponding to the first air inlet 14. The second air inlet 22 can be rectangular and slightly smaller than the first air inlet 14.

[0074] The movable part comprises a movable plate 23, which is a rectangular plate body matching the first air inlet 14. The top end side wall of the movable plate 23 is rotationally connected to the top inner wall of the first air inlet 14 through a rotating shaft, so that the lower part of the movable plate 23 can swing left and right. Since the size of the movable plate 23 is larger than the through hole 33, the right side of the movable plate 23 abuts against the left side of the fixed plate 21, so that the movable plate 23 can only rotate towards the inside of the connecting pipe body 16.

[0075] When the refrigerator door is not opened or opened for a long time, the movable plate 23 is located in the first air inlet 14 and abuts against the fixed plate 21 to block the first air inlet 14, and the air inlet valve 2 is in a closed state. When the refrigerator door is opened, the movable plate 23 rotates under the action of external air pressure, so that the first air inlet 14 is opened, and the air inlet valve 2 is in an open state. After air pressure balance, the movable plate 23 resets under its own gravity to reseal the first air inlet 14, and the air inlet valve 2 is automatically closed.

[0076] Further, in some embodiments, the inner wall of the defrosting water pipe 1 is fixedly provided with a flow guide plate 13 corresponding to the first air inlet 14.

[0077] The flow guide plate 13 can be an L-shaped plate body, which comprises a semicircular inclined plate body and a rectangular vertical plate body. The arc part of the outer end of the semicircular inclined plate body is fixedly connected to the inner wall of the connecting pipe body 16, the straight part of the outer end of the semicircular inclined plate body is connected to 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 to the inner wall of the connecting pipe body 16. The flow guide plate 13 and one side of the inner wall of the connecting pipe body 16 form a cavity, the opening end of the cavity faces the elastic deformation part 31, the air inlet valve 2 is located on the cavity, and the movable plate 23 rotates into the cavity and abuts against the flow guide plate 13.

[0078] The flow guide plate 13 and the other side of the inner wall of the connecting pipe body 16 form a drainage channel, and the flow guide plate 13 blocks the drainage channel and the air inlet valve 2.

[0079] The defrosting water flows through the drainage channel to prevent 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 13 limits the movable plate 23 in the structure of the air inlet valve.

[0080] According to the above technical features, the working principle of the refrigerator drainage system and the refrigerator in the actual application scene provided by the application is as follows:

[0081] When the refrigerator drain pipe assembly is installed, the pipe gap of the elastic deformation part 31 is extremely small in the natural state, and the elastic deformation part 31 is in a wave structure. At the bending position, the pipe gap of the elastic deformation part 31 is zero, which is equivalent to the elastic deformation part 31 being in a closed state, thereby avoiding the entry of external humid hot air into the refrigerator through the drain pipe 3.

[0082] The movable plate 23 is located in the first air inlet 14 and abuts against the fixed plate 21 to block the first air inlet 14, and the air inlet valve 2 is in a closed state.

[0083] When the defrosting water flows through the defrosting water pipe 1, the defrosting water impacts the elastic deformation part 31, so that the pipe gap of the elastic deformation part 31 increases. After the defrosting water is discharged from the drain pipe 3, the elastic deformation part 31 of the drain pipe 3 restores to a closed state under the self-elastic effect.

[0084] When the refrigerator door is opened, the movable plate 23 rotates into the connecting pipe body 16 under the action of external air pressure, so that the first air inlet 14 is opened, and the air inlet valve 2 is in an open state. When the refrigerator door is not opened or is opened for a long time, the air pressure inside and outside the defrosting water pipe 1 is balanced, and the movable plate 23 enters the first air inlet 14 under the action of its own gravity and abuts against the fixed plate 21 to block the first air inlet 14, and the air inlet valve 2 is in a closed state.

[0085] The application also provides a refrigerator comprising a cabinet and the above-mentioned refrigerator drain system.

[0086] The cabinet is provided with an evaporator chamber, and the evaporator chamber is provided with a water pan. The water inlet 11 of the defrosting water pipe is connected to the water pan.

[0087] It is easy to understand that, based on the several embodiments provided by the present application, the skilled in the art can combine, split, recombine, etc. the embodiments of the present application to obtain other embodiments, and these embodiments do not exceed the protection scope of the present application.

[0088] The above specific embodiments have further detailed the purposes, technical solutions and beneficial effects of the embodiments of the present application. It should be understood that the above is only a specific embodiment of the present application, and is not used to limit the protection scope of the embodiments of the present application. Any modification, equivalent replacement, improvement, etc. made on the basis of the technical solutions of the embodiments of the present application should be included in the protection scope of the embodiments of the present application.

Claims

1. A refrigerator drain system, characterized by: The defrosting water pipe (1) has a first water inlet (11) and a first water outlet (12) at two open ends, and a first air inlet (14) is arranged on the side wall of the defrosting water pipe (1) and communicates with the inner cavity of the defrosting water pipe (1); An air inlet valve (2) is arranged on the defrosting water pipe (1), and the air inlet valve (2) is arranged on the first air inlet (14) and configured to open or close the first air inlet (14); The drainage pipe (3) has a certain elasticity, and the drainage pipe (3) is a flexible pipe, the drainage pipe (3) includes an elastic deformation part (31) and a connecting part (32), one end of the connecting part (32) is a second water inlet (33), the second water inlet (33) is connected with the first water outlet (12), the other end of the connecting part (32) is connected with one end of the elastic deformation part (31), and the other end of the elastic deformation part (31) is a second water outlet (34); When no defrosting water flows through the drainage pipe (3), the elastic deformation part (31) is in a closed state; when defrosting water flows through the drainage pipe (3), the elastic deformation part (31) is opened under the impact of the defrosting water; The inner wall of the defrosting water pipe (1) is fixedly provided with a flow guide plate (13), and the flow guide plate (13) corresponds to the first air inlet (14); The flow guide plate (13) and one side inner wall of the defrosting water pipe (1) enclose a cavity, the open end of the cavity faces the first water outlet (12), and the air inlet valve (2) is located on the cavity; The flow guide plate (13) and the other side inner wall of the defrosting water pipe (1) enclose a drainage channel, and the flow guide plate (13) blocks the drainage channel and the air inlet valve (2).

2. The refrigerator drainage system according to claim 1, wherein: The elastic deformation part (31) has a corrugated structure, and the pipe gap of the elastic deformation part (31) is A, and 0≤A≤1mm.

3. The refrigerator drainage system according to claim 2, wherein: The defrosting water pipe (1) includes a connecting pipe body (16), and the air inlet valve (2) is arranged on the connecting pipe body (16); One end of the connecting pipe body (16) is detachably connected with the connecting part (32).

4. The refrigerator drainage system according to claim 3, wherein: The defrosting water pipe (1) further includes a collecting cover body (15); The collecting cover body (15) and the connecting pipe body (16) are an integral structure, the collecting cover body (15) is located at the other end of the connecting pipe body (16); The first water inlet (11) is located in the collecting cover body (15).

5. The refrigerator drainage system according to claim 1, wherein: The air inlet valve (2) includes a movable part; The movable part is matched with the first air inlet (14), and the movable part is rotationally connected with the edge of the first air inlet (14). ​ When the refrigerator door is not opened or opened for a long time, the movable part is located in the first air inlet (14) to block the first air inlet (14), and the air inlet valve (2) is in a closed state; when the refrigerator door is opened, the movable part rotates under the action of external air pressure to open the first air inlet (14), and the air inlet valve (2) is in an open state; after air pressure balance, the movable part resets under its own gravity to reseal the first air inlet (14), and the air inlet valve (2) is automatically closed.

6. The refrigerator drainage system according to claim 5, characterized in that: The air inlet valve (2) further comprises an abutting part, which is fixed to the outer wall of the defrost water pipe (1); When the movable part blocks the first air inlet (14), the movable part abuts against the abutting part.

7. The refrigerator drainage system according to claim 6, characterized in that: The abutting part comprises a fixed plate (21), and the movable part comprises a movable plate (23); The fixed plate (21) is fixed to the outer wall of the defrost water pipe (1), and the fixed plate (21) is provided with a second air inlet (22) corresponding to the first air inlet (14); The top end of the movable plate (23) is rotationally connected to the top inner wall of the first air inlet (14); When the refrigerator door is not opened or opened for a long time, the movable plate (23) is located in the first air inlet (14) and abuts against the fixed plate (21) to block the first air inlet (14), and the air inlet valve (2) is in a closed state; when the refrigerator door is opened, the movable plate (23) rotates under the action of external air pressure to open the first air inlet (14), and the air inlet valve (2) is in an open state; after air pressure balance, the movable plate (23) resets under its own gravity to reseal the first air inlet (14), and the air inlet valve (2) is automatically closed.

8. The refrigerator drainage system according to claim 7, characterized in that: The movable plate (23) is clamped with the flow guide plate (13).

9. A refrigerator characterized by comprising: The box body and the refrigerator drainage system according to any one of claims 1-8; The box body is provided with an evaporator chamber, and the evaporator chamber is provided with a water pan, and the water inlet (11) of the defrost water pipe is in communication with the water pan.

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