Refrigerator

Abstract

The refrigerator comprises a refrigerator body, an inner container, an evaporator, a heating piece, an air return channel and an air channel mechanism, the inner container is arranged in the refrigerator body, a storage chamber and a heat exchange chamber are arranged in the inner container, the evaporator and the heating piece are arranged in the heat exchange chamber, and the air return channel is communicated with the storage chamber and the heat exchange chamber. The air duct mechanism comprises an air duct shell, a mounting seat, a fan and a shielding assembly, the air duct shell is arranged in the inner container, an air passing cavity is formed in the air duct shell, an air inlet is formed in the air duct shell, an air outlet is formed in the air duct shell, the mounting seat is arranged in the air passing cavity, the fan is mounted on the mounting seat, and the shielding assembly comprises a shielding cover, a permanent magnet, a coil and an elastic piece. The shielding cover is sleeved outside the mounting seat and can move back and forth along a first direction, the permanent magnet is arranged on the shielding cover, the coil is arranged on the mounting seat, and the elastic piece is connected between the mounting seat and the shielding cover. According to the refrigerator, the defrosting efficiency can be improved, the food fresh-keeping effect is ensured, arrangement is more convenient, and the storage space of the storage chamber can be increased.

Description

Technical Field

[0001] The utility model relates to the technical field of refrigerators, in particular to a refrigerator. Background Art

[0002] Refrigerators are frequently used daily, and people not only focus on their cooling performance but also place higher demands on their freshness preservation and internal environment. After prolonged use, air-cooled refrigerators can experience frost on the evaporator due to heat from food, moisture from the air, and humidity from opening and closing the door, affecting cooling performance.

[0003] Therefore, the refrigerator will be set to enter the defrost state at a specific time, and the frost on the evaporator will be melted by the heating wire. During the melting process of the frost on the evaporator, hot air will be generated (the temperature of the hot air is roughly 3-5°C). The hot air will rush into the storage room of the refrigerator through the air supply port, causing a sudden change in the temperature of the storage room, affecting the refrigeration of food, and easily causing food to spoil. Utility Model Content

[0004] The purpose of the utility model is to provide a refrigerator, so that when the evaporator is defrosted, the hot air generated will not enter the storage room and will not cause a sudden change in the temperature of the storage room.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] A refrigerator, comprising:

[0007] Box;

[0008] An inner liner is placed in the box, and a storage chamber and a heat exchange chamber are provided inside the inner liner;

[0009] an evaporator, disposed in the heat exchange chamber;

[0010] A heating element is provided in the heat exchange chamber;

[0011] a return air channel, the return air channel communicating with the storage chamber and the heat exchange chamber;

[0012] An air duct mechanism, the air duct mechanism comprising:

[0013] An air duct housing is provided in the inner liner and separates the interior of the inner liner into the storage chamber and the heat exchange chamber. An air passage cavity is provided in the air duct housing. An air inlet is provided in the air duct housing to connect the heat exchange chamber and the air passage cavity. An air outlet is provided in the air duct housing to connect the storage chamber and the air passage cavity.

[0014] A mounting seat is provided in the air passage cavity, and a direction from the air inlet to the mounting seat is a first direction;

[0015] A fan is mounted on one end of the mounting base in the first direction and located at the air inlet;

[0016] A shielding assembly is provided in the air passage cavity. The shielding assembly includes:

[0017] a shielding cover, which is sleeved outside the mounting base and can move back and forth relative to the mounting base along a first direction, with an opening of the shielding cover facing the air inlet;

[0018] a permanent magnet, disposed on the shielding cover;

[0019] A coil is provided at the other end of the mounting base in the first direction;

[0020] an elastic member connected between the mounting seat and the shielding cover;

[0021] Among them, when the coil is energized, the coil can attract the permanent magnet to drive the shielding cover to move in a first direction and open the air inlet. At the same time, the shielding cover can drive the elastic part to deform. After the coil is de-energized, the elastic part elastically resets to drive the shielding cover to move in a direction opposite to the first direction and close the air inlet.

[0022] The above technical solution has the following advantages: when the coil is energized, the coil can generate a magnetic field, and the coil can attract the permanent magnet to drive the shielding cover to move in a first direction and open the air inlet. At the same time, the shielding cover can drive the elastic part to deform. After the coil is de-energized, the elastic part elastically resets to drive the shielding cover to move in a direction opposite to the first direction and close the air inlet. At this time, the heat generated by the heating element can be accumulated in the heat exchange chamber, which can improve the efficiency of defrosting the evaporator. Moreover, the heat will not enter the storage chamber and affect the food preservation effect.

[0023] In some embodiments of the present application, the mounting base includes:

[0024] A mounting base plate is attached to and fixed to the inner wall of the air passage cavity on a side facing the air inlet, and the coil is fixed to the mounting base plate;

[0025] a mounting cylinder, which is provided on a side of the mounting base plate facing the air inlet; the shielding cover is sleeved outside the mounting cylinder and can move back and forth in a first direction relative to the mounting cylinder; the elastic member is connected between the shielding cover and the mounting cylinder;

[0026] A mounting platform is provided at one end of the mounting cylinder facing the air inlet, and the fan is mounted on the mounting platform.

[0027] The above technical solution has the following advantages: by allowing the mounting base to fit and be fixed to the inner wall of the air cavity facing the air inlet, the mounting base is firmly fixed in the air cavity in the air duct shell to ensure stable support of the fan and shielding assembly.

[0028] In some embodiments of the present application, a connecting ring is provided along the circumference of the outer side of one end of the mounting cylinder close to the mounting platform, the elastic member is a tension spring, the tension spring ring is sleeved outside the mounting cylinder, one end of the tension spring is fixedly connected to the connecting ring, and the other end of the tension spring extends into the shielding cover and is fixedly connected to the inner wall of the shielding cover.

[0029] The above technical solution has the following advantages: by setting the tension spring, the tension spring can automatically drive the shielding cover to reset and close the air inlet after the coil is powered off, which is more practical and the tension spring is also easy to arrange.

[0030] In some embodiments of the present application, a receiving groove is provided on a side of the mounting base plate facing away from the air inlet, and the coil is disposed in the receiving groove.

[0031] The above technical solution has the following advantages: by providing a receiving groove on the side of the installation base plate facing away from the air inlet, the coil can be installed and hidden, the coil does not take up space, and the storage space of the storage room can be increased.

[0032] In some embodiments of the present application, a wire passing groove is provided on a side of the mounting base facing away from the air inlet, one end of the wire passing groove is connected to the accommodating groove, and the other end of the wire passing groove is connected to the outside of the mounting base.

[0033] The above technical solution has the following advantages: through the provision of the wire trough, the power lines can be arranged to avoid the installation base plate from crushing the power lines, and the installation base plate can be prevented from tilting, thereby ensuring the stability of the mounting base.

[0034] In some embodiments of the present application, the shielding cover includes a shielding cylinder and a shielding cover, the shielding cylinder is arranged outside the mounting seat, the shielding cover is arranged on the end of the shielding cylinder away from the air inlet, the shielding cover is provided with a avoidance opening for the mounting seat to pass through, and the shielding cover is provided with a receiving groove on the side facing the air inlet, and the permanent magnet is embedded in the receiving groove.

[0035] The above technical solution has the following advantages: by embedding the permanent magnet into the accommodating groove of the shielding cover, the position of the permanent magnet can be ensured to be stable, and the permanent magnet is closer to the coil, more easily attracted by the coil, and better drives the shielding cover to move.

[0036] In some embodiments of the present application, the shielding cover further includes an end cover, which is disposed in the shielding cylinder and is covered on the accommodating groove.

[0037] The above technical solution has the following advantages: the accommodating groove is closed by the end cover, so as to further stabilize the permanent magnet on the shielding cover.

[0038] In some embodiments of the present application, a first buffer pad is provided at one end of the shielding cylinder close to the air inlet.

[0039] The above technical solution has the following advantages: the first buffer pad is provided to play a buffering role between the shielding cover and the inner wall of the air passage cavity.

[0040] In some embodiments of the present application, a second buffer pad is provided at the end of the shielding cover facing away from the air inlet.

[0041] The above technical solution has the following advantages: the second buffer pad is provided to provide a buffering effect between the shielding cover and the mounting seat.

[0042] The utility model also relates to a refrigerator, comprising:

[0043] Box;

[0044] An inner liner is placed in the box, and a storage chamber and a heat exchange chamber are provided inside the inner liner;

[0045] an evaporator, disposed in the heat exchange chamber;

[0046] A heating element is provided in the heat exchange chamber;

[0047] a return air channel, the return air channel communicating with the storage chamber and the heat exchange chamber;

[0048] An air duct mechanism, the air duct mechanism comprising:

[0049] An air duct housing is provided in the inner liner and separates the interior of the inner liner into the storage chamber and the heat exchange chamber. An air passage cavity is provided in the air duct housing. An air inlet is provided in the air duct housing to connect the heat exchange chamber and the air passage cavity. An air outlet is provided in the air duct housing to connect the storage chamber and the air passage cavity.

[0050] A mounting seat is provided in the air passage cavity, and a direction from the air inlet to the mounting seat is a first direction;

[0051] A fan is mounted on one end of the mounting base in the first direction and located at the air inlet;

[0052] A shielding assembly is provided in the air passage cavity, and the shielding assembly includes:

[0053] a shielding cover, which is sleeved outside the mounting base and can move back and forth relative to the mounting base along a first direction, with an opening of the shielding cover facing the air inlet;

[0054] A permanent magnet is provided at the other end of the mounting seat in the first direction;

[0055] a coil, disposed on the shielding cover;

[0056] an elastic member connected between the mounting seat and the shielding cover;

[0057] Among them, when the coil is energized, the coil can attract the permanent magnet to drive the shielding cover to move in a first direction and open the air inlet. At the same time, the shielding cover can drive the elastic part to deform. After the coil is de-energized, the elastic part elastically resets to drive the shielding cover to move in a direction opposite to the first direction and close the air inlet.

[0058] The above technical solution has the following advantages: when the coil is energized, the coil can generate a magnetic field, and the coil can attract the permanent magnet to drive the shielding cover to move in a first direction and open the air inlet. At the same time, the shielding cover can drive the elastic part to deform. After the coil is de-energized, the elastic part elastically resets to drive the shielding cover to move in a direction opposite to the first direction and close the air inlet. At this time, the heat generated by the heating element can be accumulated in the heat exchange chamber, which can improve the efficiency of defrosting the evaporator. Moreover, the heat will not enter the storage chamber and affect the food preservation effect.

[0059] Compared with the prior art, the refrigerator according to the embodiment of the present invention has the following beneficial effects:

[0060] In the present invention, when the coil is energized, the coil can generate a magnetic field, and the coil can attract the permanent magnet. Since the coil is mounted on a mounting base, the permanent magnet is mounted on a shielding cover, and the shielding cover can move relative to the mounting base in a first direction, so that under the action of the mutual magnetic attraction between the coil and the permanent magnet, the shielding cover can be driven to move in the first direction and in a direction close to the coil, so that the shielding cover is away from the air inlet, thereby opening the air inlet. At the same time, in the process of the shielding cover approaching the coil, the shielding cover can drive the elastic part to undergo elastic deformation. Therefore, when the coil remains energized, the refrigerator is in a cooling state, and when the fan is running, the air flow can pass through the return air channel from the storage chamber into the heat exchange chamber. The air flow can cool down the temperature of the air flow when passing through the evaporator in the heat exchange chamber, and then the air flow is sucked into the air cavity of the air duct shell from the air inlet by the fan, and then the air flow enters the storage chamber from the air outlet of the air duct shell, completing the air flow circulation process of the refrigerator refrigeration. When the evaporator needs to be defrosted, the heating element operates to melt the frost accumulated on the evaporator. At this time, the coil is de-energized, the magnetic field disappears, and the elastic element is elastically reset. During the resetting process, the elastic element can reset the shielding cover, allowing the shielding cover to move in a direction opposite to the first direction, and after the shielding cover covers the fan and abuts against the inner wall of the air passage cavity, the air inlet is blocked. At this time, the heat generated by the heating element is blocked in the heat exchange chamber, which can accelerate the melting of the frost on the evaporator and improve the defrosting efficiency. Moreover, the heat in the heat exchange chamber cannot enter the air passage cavity of the air duct shell through the air inlet, so that the heat cannot enter the storage chamber, thereby not causing a sudden change in temperature in the storage chamber and avoiding affecting the freshness of the food.

[0061] Therefore, the refrigerator of the present invention keeps the air inlet open in the refrigeration state through the cooperation of the coil, permanent magnet and elastic parts, and allows the shielding cover to close the air inlet in the defrosting state, so as to improve the defrosting efficiency and avoid sudden changes in the temperature in the storage room. At the same time, compared with the conventional technology that uses motor drive, the arrangement of the coil, permanent magnet and elastic parts is more convenient and occupies less space, which can reduce the occupied volume of the air duct shell, thereby facilitating the increase of the storage space of the storage room. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] Figure 1 It is a three-dimensional diagram of a refrigerator in an embodiment of the present utility model;

[0063] Figure 2 is a cross-sectional view of a refrigerator in an embodiment of the present utility model;

[0064] Figure 3 This is a three-dimensional diagram of the air duct mechanism in the embodiment of the present utility model;

[0065] Figure 4 This is an exploded view of the air duct mechanism in the embodiment of the present utility model;

[0066] Figure 5 This is a schematic diagram of the relationship between the mounting base and the air duct housing in an embodiment of the present utility model;

[0067] Figure 6 This is a schematic diagram of a mounting base and a shielding assembly in an embodiment of the present utility model;

[0068] Figure 7 This is another schematic diagram of the mounting base and the shielding assembly in an embodiment of the present utility model;

[0069] Figure 8 This is a schematic structural diagram of the mounting base in an embodiment of the present utility model;

[0070] Figure 9 This is an exploded view of the shielding cover in the embodiment of the present utility model;

[0071] Figure 10 This is another exploded view of the shielding cover in the embodiment of the present invention.

[0072] In the figure, 1, box body; 2, liner; 21, storage room; 22, heat exchange room; 3, evaporator; 4, return air duct;

[0073] 5. Air duct mechanism;

[0074] 51. Air duct housing; 511. Air passage cavity; 512. Air inlet; 513. Air outlet;

[0075] 52. Mounting seat; 521. Mounting platform; 522. Mounting cylinder; 523. Mounting base; 524. Connecting ring; 525. Accommodating groove; 526. Wire groove;

[0076] 53. Fan;

[0077] 54. Shielding assembly; 541. Shielding cover; 5411. Shielding cylinder; 5412. Shielding cover; 5413. Avoidance opening; 5414. Accommodation groove; 5415. End cover; 5416. First buffer pad; 5417. Second buffer pad; 542. Permanent magnet; 543. Coil; 544. Elastic member. DETAILED DESCRIPTION

[0078] The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0079] In the description of the present invention, it should be understood that the term "comprising" as used in the present specification refers to the presence of the features, integers, steps, operations, parts / components and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, parts / components, components and / or groups thereof. It should be understood that when we say a part / component is "connected" to another part / component, it can be directly connected to the other part / component, or there can be intermediate parts / components. The term "and / or" as used herein includes all or any one of the associated listed items and all combinations.

[0080] Refrigerators are a common appliance in daily life and are now widely used. Users can use refrigerators to store food to prevent it from spoiling.

[0081] The refrigerator in this embodiment includes a housing 1, an inner container 2 and a door.

[0082] The box body 1 is used to form the overall appearance of the refrigerator. The box body 1 is roughly in the shape of a rectangular frame. The top of the box body 1 and the bottom of the box body 1 are opposite ends. From the top of the box body 1 to the bottom of the box body 1 is the height direction of the box body 1, the left side of the box body 1 and the right side of the box body 1 are opposite sides, from the left side of the box body 1 to the right side of the box body 1 is the width direction of the box body 1, the front side of the box body 1 and the back side of the box body 1 are opposite sides, and from the front side of the box body 1 to the back side of the box body 1 is the thickness direction of the box body 1.

[0083] An inner liner 2 is positioned within the housing 1. A storage compartment 21 is provided within the inner liner 2. The storage compartment 21 is divided into a refrigerator and a freezer. The refrigerator and freezer compartments are used to store goods. Each compartment has a cavity opening that faces the front of the housing 1. The refrigerator compartment maintains a refrigerated temperature environment, while the freezer compartment maintains a frozen temperature environment. A straight door is provided at the front of the housing 1 and is operably connected to the housing 1 to open or close the refrigerator and freezer compartments.

[0084] As will be understood, a refrigerator also includes a refrigeration system and an air supply system. The refrigeration system is installed within the housing 1 and is used to provide cold air to the refrigerator and freezer compartments. A refrigeration system is typically a closed system consisting of components such as a compressor, evaporator 3, condenser, filter drier, return air pipe, and throttling device, as well as refrigerant. Each component is located at different locations within the housing 1 according to its structural characteristics to meet its corresponding functional requirements. The operating process of the refrigeration system mainly includes compression, condensation, throttling, and evaporation. During the compression process, when the refrigerator is plugged in and the thermostat contacts are connected, the compressor begins operating. Low-temperature, low-pressure refrigerant from the evaporator 3 is drawn into the compressor, compressed by the compressor into high-temperature, high-pressure refrigerant gas, and then discharged into the condenser. During the condensation process, the high-temperature, high-pressure refrigerant gas exchanges heat with the ambient air through the condenser, causing its temperature to drop. It is gradually cooled to a saturated refrigerant vapor at room temperature and high pressure, and then to a saturated refrigerant liquid. The throttling process involves the condensed, saturated refrigerant liquid passing through a filter drier to remove moisture and impurities before flowing into a throttling device. The throttling device throttles and reduces the pressure, transforming the refrigerant into a wet vapor at room temperature and low pressure. The evaporation process involves the wet vapor at room temperature and low pressure entering the evaporator 3, where it begins absorbing heat and vaporizing. This lowers the temperature of the evaporator 3 and its surroundings, achieving refrigeration and transforming the refrigerant into a low-temperature, low-pressure gas. The refrigerant exiting the evaporator 3 returns to the compressor, where the above process repeats. This change in the refrigerant's state converts energy, transferring heat from the refrigerator to the air outside, thus completing the refrigerator's refrigeration cycle.

[0085] The air supply system is installed in the housing 1 and is used to provide power for the flow of cold air. The air supply system generally includes a fan 53 and a guide cavity. In some embodiments, the air inlet end of the guide cavity is located near the fan 53, and the air outlet end of the guide cavity is located away from the fan 53. In other embodiments, the air outlet end of the guide cavity is located near the fan 53, and the air inlet end of the guide cavity is located away from the fan 53. The fan 53 drives the air in the guide cavity. The evaporator 3 is correspondingly located in the guide cavity. The cold air cooled by the evaporator 3 flows along the guide cavity through the driving element of the fan 53, and finally enters the refrigerator and freezer compartments to cool the refrigerator and freezer compartments.

[0086] like Figures 1 to 10 As shown, the utility model relates to a refrigerator, comprising a box body 1, an inner tank 2, an evaporator 3, a heating element, a return air duct 4 and an air duct mechanism 5, the inner tank 2 is placed in the box body 1, a storage chamber 21 and a heat exchange chamber 22 are provided inside the inner tank 2, the evaporator 3 and the heating element are both provided in the heat exchange chamber 22, the return air duct 4 is provided inside the inner tank 2, and the return air duct 4 connects the storage chamber 21 and the heat exchange chamber 22.

[0087] The air duct mechanism 5 includes an air duct shell 51, a mounting seat 52, a fan 53 and a shielding component 54. The air duct shell 51 is arranged in the inner tank 2 and separates the interior of the inner tank 2 into the storage chamber 21 and the heat exchange chamber 22. The interior of the air duct shell 51 is provided with an air passage cavity 511. The side of the air duct shell 51 facing the heat exchange chamber 22 is provided with an air inlet 512 connecting the heat exchange chamber 22 and the air passage cavity 511. The side of the air duct shell 51 facing the storage chamber 21 is provided with an air outlet 513 connecting the storage chamber 21 and the air passage cavity 511. The mounting seat 52 is arranged in the air passage cavity 511. The direction from the air inlet 512 to the mounting seat 52 is a first direction. The fan 53 Installed on one end of the mounting seat 52 in the first direction and located at the air inlet 512, the shielding assembly 54 is arranged in the air cavity 511, and is used to open or close the air inlet 512. The shielding assembly 54 includes a shielding cover 541, a permanent magnet 542, a coil 543 and an elastic member 544. The shielding cover 541 is sleeved on the outside of the mounting seat 52 and can move back and forth along the first direction relative to the mounting seat 52, and the opening of the shielding cover 541 faces the air inlet 512. The permanent magnet 542 is arranged on the shielding cover 541, the coil 543 is arranged at the other end of the mounting seat 52 in the first direction, and the elastic member 544 is connected between the mounting seat 52 and the shielding cover 541.

[0088] Among them, when the coil 543 is energized, the coil 543 can generate a magnetic field, and the coil 543 can attract the permanent magnet 542 to drive the shielding cover 541 to move along the first direction and open the air inlet 512. At the same time, the shielding cover 541 can drive the elastic part 544 to deform. After the coil 543 is de-energized, the elastic part 544 elastically resets to drive the shielding cover 541 to move in a direction opposite to the first direction and close the air inlet 512.

[0089] In the present invention, when the coil 543 is energized, the coil 543 can generate a magnetic field, and the coil 543 can attract the permanent magnet 542. Since the coil 543 is mounted on the mounting base 52, the permanent magnet 542 is mounted on the shielding cover 541, and the shielding cover 541 can move relative to the mounting base 52 along a first direction, so that under the action of the mutual magnetic attraction between the coil 543 and the permanent magnet 542, the shielding cover 541 can be driven to move along the first direction and close to the coil 543, so that the shielding cover 541 is away from the air inlet 512, thereby opening the air inlet 512. At the same time, As the shield 541 approaches the coil 543, the shield 541 can drive the elastic member 544 to undergo elastic deformation. Thus, when the coil 543 remains energized, the refrigerator is in a cooling state. When the fan 53 is running, the airflow can pass through the return air channel 4 from the storage chamber 21 into the heat exchange chamber 22. When the airflow passes through the evaporator 3 in the heat exchange chamber 22, the temperature of the airflow can be reduced. Then, the airflow is sucked into the air passage 511 of the air duct shell 51 from the air inlet 512 by the fan 53, and then the airflow enters the storage chamber 21 from the air outlet 513 of the air duct shell 51, completing the airflow circulation process of the refrigerator refrigeration. When the evaporator 3 needs to be defrosted, the heating element operates to melt the frost accumulated on the evaporator 3. At this time, the coil 543 is de-energized, the magnetic field disappears, and the elastic element 544 is elastically reset. During the resetting process, the elastic element 544 can reset the shielding cover 541, allowing the shielding cover 541 to move in a direction opposite to the first direction, and after the shielding cover 541 covers the fan 53 and abuts against the inner wall of the air passage cavity 511, the air inlet 512 is blocked. At this time, the heat generated by the heating element is blocked in the heat exchange chamber 22, which can accelerate the melting of the frost accumulated on the evaporator 3 and improve the defrosting efficiency. Moreover, the heat in the heat exchange chamber 22 cannot enter the air passage cavity 511 of the air duct shell 51 through the air inlet 512, so that the heat cannot enter the storage chamber 21, thereby not causing a sudden change in temperature in the storage chamber 21 and avoiding affecting the freshness of the food.

[0090] Therefore, the refrigerator of the present invention keeps the air inlet 512 open in the cooling state through the cooperation of the coil 543, the permanent magnet 542 and the elastic member 544, and allows the shielding cover 541 to close the air inlet 512 in the defrosting state, so as to improve the defrosting efficiency and avoid sudden changes in the temperature in the storage chamber 21. At the same time, compared with the conventional technology that adopts motor drive, the arrangement of the coil 543, the permanent magnet 542 and the elastic member 544 is more convenient and occupies less space, which can reduce the occupied volume of the air duct shell 51, so as to facilitate increasing the storage space of the storage chamber 21.

[0091] In some embodiments, the heating element is a heating wire, which can be in contact with the evaporator 3 to directly transfer heat for defrosting. The heating wire can also be spaced apart from the evaporator 3 to perform defrosting by heat radiation.

[0092] In some embodiments, the return air channel 4 can be directly opened on the air duct shell 51 to allow the return air channel 4 to connect the heat exchange chamber 22 and the storage chamber 21, and the return air channel 4 is not connected to the air cavity 511 of the air duct shell 51; or, the return air channel 4 is formed between the air duct shell 51 and the inner wall of the inner tank 2.

[0093] Combine Figures 5 to 8 As shown, in some embodiments, the mounting base 52 includes a mounting platform 521, a mounting cylinder 522, and a mounting base plate 523 connected in sequence along a first direction, the mounting base plate 523 is attached to and fixed to the inner wall of the air cavity 511 facing the air inlet 512, the coil 543 is fixed on the mounting base plate 523, the fan 53 is installed on the mounting platform 521, the shielding cover 541 is mounted on the outside of the mounting cylinder 522, and can move back and forth along the first direction relative to the mounting cylinder 522, and the elastic member 544 is connected between the shielding cover 541 and the mounting cylinder 522.

[0094] Specifically, the mounting base plate 523 is fixed to the side of the air cavity 511 facing the air inlet 512 by screws, so that the mounting base plate 523 is stably fixed in the air duct shell 51 to ensure the stability of the mounting base 52 in the air cavity 511. The shielding cover 541 is sleeved on the outside of the mounting cylinder 522, so that the shielding cover 541 can move stably. The mounting platform 521 extends to the air inlet 512 of the air duct shell 51, so that after the fan 53 is installed on the mounting platform 521, the fan 53 is stably located at the air inlet 512, so that when the fan 53 is running, the air flow can be sucked into the air cavity 511 of the air duct shell 51.

[0095] In some embodiments, a connecting ring 524 is provided along the circumference of the outer side of one end of the mounting cylinder 522 close to the mounting platform 521, and the elastic member 544 is a tension spring. The tension spring ring is arranged outside the mounting cylinder 522, and one end of the tension spring is fixedly connected to the connecting ring 524. The other end of the tension spring extends into the shielding cover 541 and is fixedly connected to the inner wall of the shielding cover 541.

[0096] The stretching spring coil is arranged outside the mounting cylinder 522, and the stretching spring is located between the connecting ring 524 and the mounting base 523. One end of the stretching spring is fixedly connected to the connecting ring 524, and the other end of the stretching spring extends into the shielding cover 541 and is fixedly connected to the shielding cover 541. Therefore, when the shielding cover 541 moves toward the coil 543 when the coil 543 is energized, the stretching spring is stretched by the shielding cover 541. After the coil 543 is de-energized, the stretching spring resets and contracts, which can drive the shielding cover 541 to move away from the coil 543, so that the shielding cover 541 can cover and close the air inlet 512, and the stretching spring can continuously apply tension to the shielding cover 541, so that the shielding cover 541 can continuously press against the inner wall of the air cavity 511 to ensure sealing.

[0097] In some embodiments, a receiving groove 525 is defined on a side of the mounting base 523 facing away from the air inlet 512 , and the coil 543 is disposed in the receiving groove 525 .

[0098] The mounting base 523 is provided with a receiving groove 525 on the side facing away from the air inlet 512, and the coil 543 is embedded in the receiving groove 525. Then, after the mounting base 523 is fixed to the inner wall of the air cavity 511, the coil 543 can be fixed and hidden, ensuring that the position of the coil 543 is stable, and the coil 543 does not take up additional space, which is conducive to reducing the size of the air duct shell 51 to increase the storage space of the storage chamber 21.

[0099] In some embodiments, a wire groove 526 is provided on the side of the mounting base 523 facing away from the air inlet 512 , one end of the wire groove 526 is connected to the receiving groove 525 , and the other end of the wire groove 526 is connected to the outside of the mounting base 523 .

[0100] By opening a wire groove 526 on the side of the installation base 523 facing away from the air inlet 512, the power cord can pass through the wire groove 526 and enter the receiving groove 525 to be electrically connected to the coil 543, so that the installation base 523 will not press on the power cord after installation to prevent the power cord from being crushed, and will not cause the installation base 523 to tilt up, thereby ensuring the stability of the installation base 52 in the air cavity 511.

[0101] Combine Figure 9 and Figure 10As shown, in some embodiments, the shielding cover 541 includes a shielding cylinder 5411 and a shielding cover 5412, the shielding cylinder 5411 is sleeved on the outside of the mounting seat 52, the shielding cover 5412 is covered on the end of the shielding cylinder 5411 away from the air inlet 512, the shielding cover 5412 is provided with an avoidance opening 5413 for the mounting seat 52 to pass through, and the shielding cover 5412 is provided with a receiving groove 5414 on the side facing the air inlet 512, and the permanent magnet 542 is embedded in the receiving groove 5414.

[0102] Specifically, the shielding cover 5412 is provided with the avoidance opening 5413, and the mounting cylinder 522 of the mounting seat 52 can be adapted to penetrate the avoidance opening 5413, so that the shielding cylinder 5411 can be sleeved on the outside of the mounting cylinder 522, and one end of the tension spring enters the shielding cylinder 5411 and is fixedly connected to the shielding cover 5412, thereby realizing the fixed connection between the tension spring and the shielding cover 541, and the shielding cover 5412 is provided with a receiving groove 5414 on the side facing the air inlet 512, and the permanent magnet 542 is embedded in the receiving groove 5414, thereby ensuring the stable position of the permanent magnet 542, and since the permanent magnet 542 is installed on the shielding cover 5412, it is closer to the coil 543, so that it is easy to be attracted by the coil 543, thereby making it easier to drive the shielding cover 541 to move.

[0103] In some embodiments, the shielding cover 541 also includes an end cover 5415, which is disposed in the shielding cylinder 5411 and is covered on the accommodating groove 5414 to seal the permanent magnet 542 in the accommodating groove 5414 to further ensure the stability of the permanent magnet 542 on the shielding cover 5412.

[0104] In some embodiments, a first buffer pad 5416 is provided at one end of the shielding cylinder 5411 close to the air inlet 512, so that when the tension spring pulls the shielding cover 541 to move in a direction opposite to the first direction and abuts against the inner wall of the air cavity 511, it can play a buffering role, reduce the impact caused by collision, improve service life, and reduce noise caused by collision.

[0105] In some embodiments, a second buffer pad 5417 is provided at the end of the shielding cover 5412 facing away from the air inlet 512, so that when the coil 543 attracts the permanent magnet 542 and drives the shielding cover 541 to move along the first direction, it can act as a buffer between the shielding cover 541 and the mounting base 523, thereby reducing the impact generated when the two collide, improving the service life, and reducing the noise generated by the collision.

[0106] In some embodiments, the first cushion 5416 and the second cushion 5417 are both made of sponge foam, thereby reducing noise and impact.

[0107] The utility model also relates to a refrigerator, comprising a box body 1, an inner tank 2, an evaporator 3, a heating element, a return air duct 4 and an air duct mechanism 5, wherein the inner tank 2 is placed in the box body 1, a storage chamber 21 and a heat exchange chamber 22 are provided inside the inner tank 2, the evaporator 3 and the heating element are both provided in the heat exchange chamber 22, the return air duct 4 is provided inside the inner tank 2, and the return air duct 4 communicates with the storage chamber 21 and the heat exchange chamber 22.

[0108] The air duct mechanism 5 includes an air duct shell 51, a mounting seat 52, a fan 53 and a shielding component 54. The air duct shell 51 is arranged in the inner liner 2 and separates the interior of the inner liner 2 into the storage chamber 21 and the heat exchange chamber 22. The interior of the air duct shell 51 is provided with an air passage cavity 511. The side of the air duct shell 51 facing the heat exchange chamber 22 is provided with an air inlet 512 connecting the heat exchange chamber 22 and the air passage cavity 511. The side of the air duct shell 51 facing the storage chamber 21 is provided with an air outlet 513 connecting the storage chamber 21 and the air passage cavity 511. The mounting seat 52 is arranged in the air passage cavity 511. The direction from the air inlet 512 to the mounting seat 52 is a first direction. The fan 53 Installed on one end of the mounting seat 52 in the first direction and located at the air inlet 512, the shielding assembly 54 is used to open or close the air inlet 512, and the shielding assembly 54 is arranged in the air passage cavity 511, which includes a shielding cover 541, a permanent magnet 542, a coil 543 and an elastic member 544. The shielding cover 541 is sleeved on the outside of the mounting seat 52 and can be moved relative to the mounting seat 52 along the first direction, and the opening of the shielding cover 541 faces the air inlet 512, the permanent magnet 542 is arranged at the other end of the mounting seat 52 in the first direction, the coil 543 is arranged on the shielding cover 541, and the elastic member 544 is connected between the mounting seat 52 and the shielding cover 541.

[0109] Among them, when the coil 543 is energized, the coil 543 can generate a magnetic field, and the coil 543 can attract the permanent magnet 542 to drive the shielding cover 541 to move along the first direction and open the air inlet 512. At the same time, the shielding cover 541 can drive the elastic part 544 to deform. After the coil 543 is de-energized, the elastic part 544 elastically resets to drive the shielding cover 541 to move in a direction opposite to the first direction and close the air inlet 512.

[0110] In the present invention, when the coil 543 is energized, the coil 543 can generate a magnetic field, and the coil 543 can attract the permanent magnet 542. Since the permanent magnet 542 is mounted on the mounting base 52, the coil 543 is mounted on the shielding cover 541, and the shielding cover 541 can move relative to the mounting base 52 along a first direction. Therefore, under the action of the mutual magnetic attraction between the coil 543 and the permanent magnet 542, the shielding cover 541 can be driven to move along the first direction and close to the coil 543, so that the shielding cover 541 is away from the air inlet 512, thereby opening the air inlet 512. At the same time, As the shield 541 approaches the permanent magnet 542, the shield 541 can drive the elastic member 544 to undergo elastic deformation. Thus, when the coil 543 remains energized, the refrigerator is in a cooling state. When the fan 53 is running, the airflow can pass through the return air channel 4 from the storage chamber 21 into the heat exchange chamber 22. When the airflow passes through the evaporator 3 in the heat exchange chamber 22, the temperature of the airflow can be reduced. Then, the airflow is sucked into the air passage 511 of the air duct shell 51 from the air inlet 512 by the fan 53, and then the airflow enters the storage chamber 21 from the air outlet 513 of the air duct shell 51, completing the airflow circulation process of the refrigerator refrigeration. When the evaporator 3 needs to be defrosted, the heating element operates to melt the frost accumulated on the evaporator 3. At this time, the coil 543 is de-energized, the magnetic field disappears, and the elastic element 544 is elastically reset. During the resetting process, the elastic element 544 can reset the shielding cover 541, allowing the shielding cover 541 to move in a direction opposite to the first direction, and after the shielding cover 541 covers the fan 53 and abuts against the inner wall of the air passage cavity 511, the air inlet 512 is blocked. At this time, the heat generated by the heating element is blocked in the heat exchange chamber 22, which can accelerate the melting of the frost accumulated on the evaporator 3 and improve the defrosting efficiency. Moreover, the heat in the heat exchange chamber 22 cannot enter the air passage cavity 511 of the air duct shell 51 through the air inlet 512, so that the heat cannot enter the storage chamber 21, thereby not causing a sudden change in temperature in the storage chamber 21 and avoiding affecting the freshness of the food.

[0111] Therefore, the refrigerator of the present invention keeps the air inlet 512 open in the cooling state through the cooperation of the coil 543, the permanent magnet 542 and the elastic member 544, and allows the shielding cover 541 to close the air inlet 512 in the defrosting state, so as to improve the defrosting efficiency and avoid sudden changes in the temperature in the storage chamber 21. At the same time, compared with the conventional technology that adopts motor drive, the arrangement of the coil 543, the permanent magnet 542 and the elastic member 544 is more convenient and occupies less space, which can reduce the occupied volume of the air duct shell 51, so as to facilitate increasing the storage space of the storage chamber 21.

[0112] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and replacements can be made without departing from the technical principles of the present invention. These improvements and replacements should also be regarded as the scope of protection of the present invention.

Claims

1. A refrigerator, characterized in that: include: Box; An inner liner is placed in the box, and a storage chamber and a heat exchange chamber are provided inside the inner liner; an evaporator, disposed in the heat exchange chamber; A heating element is provided in the heat exchange chamber; a return air channel, the return air channel communicating with the storage chamber and the heat exchange chamber; An air duct mechanism, the air duct mechanism comprising: An air duct housing is provided in the inner liner and separates the interior of the inner liner into the storage chamber and the heat exchange chamber. An air passage cavity is provided in the air duct housing. An air inlet is provided in the air duct housing to connect the heat exchange chamber and the air passage cavity. An air outlet is provided in the air duct housing to connect the storage chamber and the air passage cavity. A mounting seat is provided in the air passage cavity, and a direction from the air inlet to the mounting seat is a first direction; A fan is mounted on one end of the mounting base in the first direction and located at the air inlet; A shielding assembly is provided in the air passage cavity, and the shielding assembly includes: a shielding cover, which is sleeved outside the mounting base and can move back and forth relative to the mounting base along a first direction, with an opening of the shielding cover facing the air inlet; a permanent magnet, disposed on the shielding cover; A coil is provided at the other end of the mounting base in the first direction; an elastic member connected between the mounting seat and the shielding cover; Among them, when the coil is energized, the coil can attract the permanent magnet to drive the shielding cover to move in a first direction and open the air inlet. At the same time, the shielding cover can drive the elastic part to deform. After the coil is de-energized, the elastic part elastically resets to drive the shielding cover to move in a direction opposite to the first direction and close the air inlet.

2. The refrigerator according to claim 1, wherein: The mounting base comprises: A mounting base plate is attached to and fixed to the inner wall of the air passage cavity on a side facing the air inlet, and the coil is fixed to the mounting base plate; a mounting cylinder, which is provided on a side of the mounting base plate facing the air inlet; the shielding cover is sleeved outside the mounting cylinder and can move back and forth in a first direction relative to the mounting cylinder; the elastic member is connected between the shielding cover and the mounting cylinder; A mounting platform is provided at one end of the mounting cylinder facing the air inlet, and the fan is mounted on the mounting platform.

3. The refrigerator according to claim 2, characterized in that A connecting ring is provided along the circumference of the outer side of one end of the mounting cylinder close to the mounting platform. The elastic member is a tension spring. The tension spring coil is sleeved outside the mounting cylinder. One end of the tension spring is fixedly connected to the connecting ring. The other end of the tension spring extends into the shielding cover and is fixedly connected to the inner wall of the shielding cover.

4. The refrigerator according to claim 2, characterized in that A receiving groove is provided on a side of the installation base plate facing away from the air inlet, and the coil is arranged in the receiving groove.

5. The refrigerator according to claim 4, characterized in that A wire passing groove is provided on a side of the installation base plate facing away from the air inlet, one end of the wire passing groove is communicated with the accommodating groove, and the other end of the wire passing groove is communicated with the outside of the installation base plate.

6. The refrigerator according to claim 1, wherein: The shielding cover includes a shielding cylinder and a shielding cover. The shielding cylinder is sleeved on the outside of the mounting seat. The shielding cover is covered on the end of the shielding cylinder away from the air inlet. The shielding cover is provided with an escape opening for the mounting seat to pass through. The shielding cover is provided with a receiving groove on the side facing the air inlet, and the permanent magnet is embedded in the receiving groove.

7. The refrigerator according to claim 6, characterized in that The shielding cover further includes an end cover, which is arranged in the shielding cylinder and is covered on the accommodating groove.

8. The refrigerator according to claim 6, characterized in that A first buffer pad is provided at one end of the shielding cylinder close to the air inlet.

9. The refrigerator according to claim 6, wherein: A second buffer pad is provided on one end of the shielding cover body facing away from the air inlet.

10. A refrigerator, characterized in that: include: Box; An inner liner is placed in the box, and a storage chamber and a heat exchange chamber are provided inside the inner liner; an evaporator, disposed in the heat exchange chamber; A heating element is provided in the heat exchange chamber; a return air channel, the return air channel communicating with the storage chamber and the heat exchange chamber; An air duct mechanism, the air duct mechanism comprising: An air duct housing is provided in the inner liner and separates the interior of the inner liner into the storage chamber and the heat exchange chamber. An air passage cavity is provided in the air duct housing. An air inlet is provided in the air duct housing to connect the heat exchange chamber and the air passage cavity. An air outlet is provided in the air duct housing to connect the storage chamber and the air passage cavity. A mounting seat is provided in the air passage cavity, and a direction from the air inlet to the mounting seat is a first direction; A fan is mounted on one end of the mounting base in the first direction and located at the air inlet; A shielding assembly is provided in the air passage cavity, and the shielding assembly includes: a shielding cover, which is sleeved outside the mounting base and can move back and forth relative to the mounting base along a first direction, with an opening of the shielding cover facing the air inlet; A permanent magnet is provided at the other end of the mounting seat in the first direction; a coil, disposed on the shielding cover; an elastic member connected between the mounting seat and the shielding cover; Among them, when the coil is energized, the coil can attract the permanent magnet to drive the shielding cover to move in a first direction and open the air inlet. At the same time, the shielding cover can drive the elastic part to deform. After the coil is de-energized, the elastic part elastically resets to drive the shielding cover to move in a direction opposite to the first direction and close the air inlet.

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