CN110487003B

CN110487003B - A kind of refrigerator

Info

Publication number: CN110487003B
Application number: CN201910910603.8A
Authority: CN
Inventors: 杨大海; 韩丽丽; 张守杰; 张月; 魏代同; 张升刚
Original assignee: Hisense Shandong Refrigerator Co Ltd
Current assignee: Hisense Refrigerator Co Ltd
Priority date: 2019-09-25
Filing date: 2019-09-25
Publication date: 2021-08-24
Anticipated expiration: 2039-09-25
Also published as: CN110487003A

Abstract

The invention discloses a refrigerator, relates to the technical field of refrigerator equipment, and aims to solve the problem that the temperature fluctuation in a refrigerating chamber is large because the local temperature of the refrigerating chamber cannot be adjusted in the conventional refrigerator. The refrigerator comprises a refrigerator body, wherein a plurality of air supply ducts are arranged on the rear side of an inner container inside the refrigerator body, the air supply ducts correspond to the multilayer storage spaces of the refrigerating chamber of the refrigerator body respectively, each air supply duct is internally provided with a rotary air door, the rotary air doors are controlled by a group of driving mechanisms, and the driving mechanisms can control each rotary air door to be opened or closed respectively. The refrigerator is used for storing food materials.

Description

A kind of refrigerator

Technical Field

The invention relates to the technical field of refrigerator equipment, in particular to a refrigerator.

Background

With the continuous improvement of the living standard of people, the fresh-keeping performance of the refrigerator for consumers is not only limited to prolonging the shelf life of food, but also the requirements on the aspects of the taste, nutrition and the like of the food are continuously improved. The preservation performance is one of important parameters for improving the performance of the refrigerator, accurate temperature control preservation is representative in the technical means for improving the preservation performance of the refrigerator, and researches show that the fluctuation of temperature has great influence on the moisture and the nutritive value of food.

At present, the air intake is adjusted through opening and closing of control air doors in the existing refrigerator, so that the temperature of the refrigerating chamber is adjusted, however, in the temperature adjusting mode, when the air intake of the refrigerating chamber is increased, the temperature of the whole refrigerating chamber is reduced, when new food materials are put into the refrigerating chamber, the temperature of the new food materials can be reduced, but the temperature of the food materials stored in the refrigerating chamber can be further reduced, the storage temperature in the refrigerating chamber is enabled to generate large fluctuation, and the fresh-keeping of the food materials is not facilitated.

Disclosure of Invention

The embodiment of the invention provides a refrigerator which can respectively supply air to each layer of storage space of a refrigerating chamber, so that the local temperature of the refrigerating chamber is adjusted, the temperature fluctuation of the refrigerating chamber is reduced, and the fresh-keeping quality of food materials is improved.

In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:

the embodiment of the invention provides a refrigerator which comprises a refrigerator body, wherein a plurality of air supply channels are arranged on the rear side of an inner container in the refrigerator body and respectively correspond to a multi-layer storage space of a refrigerating chamber of the refrigerator body, rotary air doors are arranged in the air supply channels, the rotary air doors are controlled by a group of driving mechanisms, and the driving mechanisms can respectively control the opening or the closing of each rotary air door.

According to the refrigerator provided by the embodiment of the invention, the plurality of rotary air doors are correspondingly arranged in the plurality of air supply channels on the rear side of the inner container of the refrigerator body, each air supply channel respectively corresponds to one layer of storage space of the refrigerating chamber, so that air can be respectively supplied to each layer of storage space of the refrigerating chamber, the plurality of rotary air doors are controlled by the group of driving mechanisms, and each rotary air door can be respectively controlled to be opened or closed by the driving mechanisms, so that layered control air supply of each layer of storage space of the refrigerating chamber is realized, when new food materials are put into the refrigerating chamber, air can be independently supplied to the layer of storage space in which the new food materials are placed, the influence on other areas of the refrigerating chamber is reduced, the temperature fluctuation of the refrigerating chamber is reduced, and the fresh-keeping quality of the food materials is improved.

Drawings

Fig. 1 is a schematic view of an overall structure of a refrigerator according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a duct foam provided in an embodiment of the present invention;

FIG. 3 is a schematic view of a first perspective of a plurality of rotary dampers according to an embodiment of the present invention;

FIG. 4 is a schematic view of a second view of a plurality of rotary dampers according to an embodiment of the present invention;

FIG. 5 is a schematic view of a plurality of rotary dampers according to an embodiment of the present invention (one rotary damper is not shown);

FIG. 6 is a schematic structural diagram of a plurality of rotary dampers according to an embodiment of the present invention (not shown in the figure, showing a cover plate of the damper housing);

fig. 7 is a schematic view of an overall structure of a first view angle of a driving assembly inside a housing according to an embodiment of the present invention;

fig. 8 is a schematic view of an overall structure of a second view angle of the driving assembly inside the housing according to the embodiment of the invention.

Reference numerals: 100. a box body; 110. air duct foam; 111. an air supply duct; 112. an air supply outlet; 120. rotating the air door; 121. a damper housing; 1211. a body; 1212. a cover plate; 122. an air inlet 123 and an air outlet; 124. a rack; 125. an air duct; 126. a rotating shaft; 127. a gear; 130. a drive assembly; 131. a drive motor; 132. a screw; 133. a nut; 134. a butt joint plate; 140. a housing; 150. a motor protection shell; 160. an evaporator; 170. an air supply fan; 200. a door body.

Detailed Description

A refrigerator according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

An embodiment of the present invention provides a refrigerator having an approximately rectangular parallelepiped shape, as shown in fig. 1, and an external appearance of the refrigerator is defined by a storage compartment defining a storage space and a plurality of door bodies 200 provided in the storage compartment.

The storage compartment is a cabinet 100 having an opening, and is vertically partitioned into a lower freezing compartment and an upper refrigerating compartment, and each of the partitioned spaces may have an independent storage space.

In detail, the freezing compartment is defined at a lower side of the storage compartment and may be selectively covered by the drawer-type freezing compartment door body 200. The space defined above the freezing chamber is partitioned into left and right sides to respectively define the refrigerating chamber. The refrigerating chamber is selectively opened or closed by a refrigerating chamber door body 200 pivotably installed on the refrigerating chamber.

The evaporator 160 is disposed at the lower portion of the rear side of the inner container of the box 100, the air supply fan 170 is disposed above the evaporator 160, and the plurality of air supply ducts 111 are disposed above the air supply fan 170.

The plurality of air feeding ducts 111 provided in the embodiment of the present invention respectively correspond to the multi-layer storage space of the refrigerating chamber of the box 100, as shown in fig. 2 and 3, each air feeding duct 111 is provided therein with a rotary damper 120, the plurality of rotary dampers 120 are controlled by a set of driving mechanism, and the driving mechanism can respectively control each rotary damper 120 to open or close.

According to the refrigerator provided by the embodiment of the invention, the plurality of rotary air doors 120 are correspondingly arranged in the plurality of air supply channels 111 on the rear side of the inner container in the refrigerator body 100, each air supply channel 111 respectively corresponds to one layer of storage space of the refrigerating chamber, so that air can be supplied to each layer of storage space of the refrigerating chamber, the plurality of rotary air doors 120 are controlled by one group of driving mechanisms, each rotary air door 120 can be controlled to be opened or closed through the driving mechanisms, so that layered control air supply of each layer of storage space of the refrigerating chamber is realized, when new food materials are put into the refrigerating chamber, air can be supplied to the layer of storage space in which the new food materials are placed independently, the influence on other areas of the refrigerating chamber is reduced, the temperature fluctuation of the refrigerating chamber is reduced, and the fresh-keeping quality of the food materials is improved.

In addition, since the plurality of rotary dampers 120 are controlled by the same set of driving mechanisms, it is possible to reduce the number of parts in the casing 100, increase the space in the casing 100, and reduce the production cost.

As shown in fig. 6 and 7, the addendum circles of the plurality of gears 127 have the same tangent line, the driving mechanism includes a driving component and a rack 124, the driving component drives the rack 124 to reciprocate along a direction parallel to the tangent line, and the driving component can drive the rack 124 to rotate around the movement direction thereof. Through the transmission mode that the rack 124 is meshed with the gear 127, the rack 124 drives the gear 127 to rotate and controls the rotary damper 120 to open or close, the driving assembly controls the rack 124 to rotate to a position where the rack 124 can be meshed with the gear 127, and then the rack 124 is driven to move along a direction parallel to the tangent line, so that the rack 124 is meshed with the gear 127, and the gear 127 drives the corresponding rotary damper 120 to open.

In addition, when the partial rotary damper 120 needs to be opened, the driving assembly controls the rack 124 to rotate to a position misaligned with the gear 127, then controls the rack 124 to move to the rotary damper 120 needing to be opened, controls the rack 124 to rotate to a position capable of meshing with the gear 127, and continues to move, so that the rack 124 meshes with the gear 127, thereby opening or closing the rotary damper 120.

Therefore, the opening or closing of the plurality of rotary dampers 120 can be controlled by one set of driving components through the process, so that the components in the box body are reduced, and the production cost is reduced.

It should be noted that the plurality of gears 127 may be of the same size or different sizes, as long as the plurality of gears 127 have a common tangent line, and when the rack 124 moves in a direction parallel to the tangent line, the plurality of gears 127 can be sequentially engaged with each other, thereby controlling the plurality of rotary dampers 120 to open or close.

The driving assembly provided by the embodiment of the invention comprises a driving motor 131, a screw 132, a nut 133 and an abutting part, as shown in fig. 7 and 8, the screw 132 is connected with an output shaft of the driving motor 131, the nut 133 is sleeved on the screw 132, the nut 133 is connected with the rack 124, and an axis of the screw 132 is parallel to a moving direction of the rack 124; when the driving motor 131 rotates forward, the nut 133 drives the rack 124 to rotate with the screw 132, and when the rack 124 rotates to a position where the rack can be meshed with the gear 127, the rack 124 is blocked by the abutting piece and moves in a first direction along the axial direction of the screw 132; when the driving motor 131 rotates reversely, the nut 133 drives the rack 124 to rotate along with the screw 132, and when the rack 124 rotates to a position dislocated from the gear 127, the rack 124 is blocked by the abutting member and moves in the second direction along the axial direction of the screw 132. When the rack 124 moves in the first direction, the rack 124 may engage with the gear 127, and when the rack 124 moves in the second direction, the rack 124 and the gear 127 are respectively located at two sides of the screw 132, that is, the rack 124 and the gear 127 are mutually dislocated, so that the position of the rack 124 is moved through the mutual cooperation of the two movement modes, and the rack 124 is selectively engaged with any one gear 127, thereby realizing the control of the opening or closing of the plurality of rotary dampers 120 respectively.

Specifically, in the embodiment of the present invention, three rotary dampers 120 are provided, as shown in fig. 7 and fig. 8, the driving motor 131 is disposed on the left side of the rotary damper 120, the three rotary dampers 120 are sequentially marked as a first rotary damper 120, a second rotary damper 120, and a third rotary damper 120 from left to right, when the three rotary dampers 120 need to be sequentially opened, the driving motor 131 is only controlled to rotate, so that the nut 133 drives the rack 124 to slide from left to right, and the three rotary dampers 120 can be sequentially opened, and the driving motor 131 is controlled to rotate in the reverse direction, so that the three rotary dampers 120 can be sequentially closed, however, when the first rotary damper 120 needs to be closed and the other two rotary dampers 120 need to be opened, the specific movement process is as follows:

as shown in fig. 7 and 8, first, the driving motor 131 is controlled to start, the screw 132 is rotated, the rack 124 is blocked by the abutting member, the nut 133 drives the rack 124 to slide along the axial direction of the screw 132 in a direction away from the driving motor 131, so as to open the first rotary damper 120, when the rack 124 moves to a position between the first rotary damper 120 and the second rotary damper 120, the control motor stops and rotates in a reverse direction, at this time, the screw 132 rotates in a reverse direction, under the action of friction force, the nut 133 is rotated along with the screw 132, so that the nut 133 drives the rack 124 to rotate to the other side of the screw 132, that is, the rack 124 and the gear 127 are respectively located at both sides of the screw 132, when the rack 124 is blocked by the abutting member again, the nut 133 slides in a direction approaching the driving motor 131 along the axial direction of the screw 132, and when the nut 133 and the rack 124 slide to a position between the first rotary damper 120 and the driving motor 131, the control motor stops and rotates forward again, then the nut 133 rotates along with the screw 132 again, so that the rack 124 rotates to one side of the gear 127, then the nut 133 drives the rack 124 to slide in the direction away from the driving motor 131, when the rack 124 is meshed with the gear 127 of the first rotary air door 120, the first rotary air door 120 is driven to rotate again, namely the first rotary air door 120 is closed, then the driving motor 131 continues to rotate, when the rack 124 passes through the second rotary air door 120 and the third rotary air door 120 in sequence, the second rotary air door 120 and the third rotary air door 120 can be opened, at the moment, the first rotary air door 120 is closed, and the second rotary air door 120 and the third rotary air door 120 are opened.

It should be noted that, with the solution of three rotary dampers 120 provided in the embodiment of the present invention, through the control process, 8 different open/close states of the rotary dampers 120 can be realized, that is, fully closed, fully open, three open states of only one rotary damper 120 (the first rotary damper 120 is open, the second rotary damper 120 is open, and the third rotary damper 120 is open), and three open states of two rotary dampers 120 (the first rotary damper 120 is open, the third rotary damper 120 is open, and the second rotary damper is open), and total 8 open/close states. And the number of the rotary dampers 120 can be increased or decreased according to actual production and use conditions, and when the number of the rotary dampers 120 is changed, the number of the open/close states which can be realized is also changed.

Through the mode, the driving mechanism provided by the embodiment of the invention can selectively open one or more rotary air doors 120 to respectively supply air to one or more layers of storage spaces of the storage room, so that single-layer air supply and layered control of the refrigerating room are realized, the influence on other areas of the refrigerating room can be reduced when air is supplied to a certain layer of storage space, the temperature fluctuation of the refrigerating room is reduced, and the fresh-keeping quality of food materials is improved.

The abutting member provided by the embodiment of the present invention is an abutting plate 134, the abutting plate 134 is parallel to the back surface of the box 100 and parallel to the axis of the screw 132, the screw 132 and the gear 127 are disposed on one side of the abutting plate 134, the rotary damper 120 is disposed on the other side of the abutting plate 134, and the gear 127 and the rotary damper 120 are connected through a rotating shaft 126. When the rack 124 abuts against the plate surface of the abutting plate 134 (i.e. the side surface of the rack 124 contacts with the abutting plate 124), at this time, the nut 133 cannot rotate continuously, because the screw 132 rotates continuously and the screw 132 and the nut 133 are in threaded connection, the nut 133 drives the rack 124 to move along the axial direction of the screw 132, and when the rack 124 and the gear 127 are on the same side of the screw 132, the rack 124 can be meshed with the gear 127 and drive the rotary damper 120 to open or close, and when the rack 124 and the gear 127 are on both sides of the screw 132, i.e. the rack 124 is dislocated with the gear 127 and cannot be meshed, so that the position of the rack 124 can be adjusted, the rack 124 moves to refer to the position of the rotary damper 120 that needs to be opened or closed, and then the rack 124 rotates to the same side 127 of the gear and meshes with the corresponding gear 127.

The rotary air door 120 provided by the embodiment of the invention can be arranged as an air door shell, the interior of the air door shell is arranged as a hollow structure, the air door shell is provided with an air inlet hole and an air outlet hole, and the air inlet hole and the air outlet hole are both provided with air door covers, so that when the air door covers are opened at the same time, the air supply duct 111 can be ventilated; the structure can also be adopted, as shown in fig. 3 and 4, a plurality of air door housings 121 are arranged on the abutting plate 134, the rotary air door 120 is arranged in the air door housing 121, as shown in fig. 5, an air inlet 122 and an air outlet 123 are arranged on the air door housing 121, an air duct 125 is arranged in the rotary air door 120, and the air duct 125 is used for communicating the air inlet 122 with the air outlet 123. The structure of above-mentioned air door shell needs opening of two air door covers of simultaneous control just can make air supply duct 111 ventilate, compares in this structure, adopts air door casing 121 and rotatory air door 120 structure of rotation connection each other, only needs rotatory air door 120 of control to rotate can control air supply duct 111 ventilate and close, does not need a plurality of mechanisms of simultaneous control to rotate, and it is more convenient to control.

The shape of the rotary damper 120 provided in the embodiment of the present invention is not unique, and may be a cubic structure, or may be a cylindrical structure, and compared to the rotary damper 120 having a cubic structure, the matching degree of the installation of the rotary damper 120 having a cylindrical structure in the damper housing 121 is higher, that is, the rotary damper 120 having a cylindrical structure can adapt to different shapes in the damper housing 121, and an edge of the rotary damper 120 having a cubic structure easily collides with an inner wall of the damper housing 121, thereby affecting the rotation of the rotary damper 120, and easily damaging components, so as shown in fig. 4, 5, and 6, it is preferable that the rotary damper 120 has a cylindrical structure, an end surface of the cylindrical structure is parallel to the abutting plate 134, the ventilation channel 125 is radially opened in the cylindrical structure, an axis of the rotary shaft 126 coincides with an axis of the cylindrical structure, and a part of the damper housing 121, The air inlet 122 and the air outlet 123 are sequentially arranged along the air supply direction of the air duct at the rear side of the refrigerator liner, and when the rotary air door 120 rotates inside the air door shell 121, the opening and closing of the air duct at the rear side of the refrigerator can be realized.

Furthermore, the shape of the inner cavity of the air door housing 121 is matched with the cylindrical structure of the rotary air door 120, so that the outer wall of the rotary air door 120 is attached to the inner wall of the air door housing 121, and the rotary air door 120 can rotate inside the air door housing 121, thereby ensuring that air cannot pass through the gap between the outer wall of the rotary air door 120 and the inner wall of the air door housing 121, and ensuring that the air supply quantity of the refrigerating chamber is accurately controlled.

Preferably, as shown in fig. 4, 5, and 7, the rack 124 and the gear 127 provided in the embodiment of the present invention need to have sizes corresponding to each other, and specifically, during the movement of the rack 124, the rack 124 and the gear 127 are just engaged to the rack 124 and the gear 127 respectively, the rack 124 drives the rotary damper 120 to rotate by an angle, so that the air duct 125, the air outlet 123, and the air inlet 122 are changed from a state in which the air duct 125 is staggered from one another (a closed state) to a state in which the air inlet 122 is communicated with the air outlet 123 (an open state), that is, the rotary damper 120 is changed from the closed state to the open state.

For example, on the radial cross section of the rotary damper 120, the opening length of the air duct 125 occupies one of four winds around the circumference of the rotary damper 120, and the air outlet 123 and the air inlet 122 of the damper housing 121 also occupy one quarter of the circumference of the inner wall of the damper housing 121, respectively, that is, when the rotary damper 120 rotates by 90 °, the air duct 125, the air inlet 122, and the air outlet 123 can be changed from a staggered state to a corresponding communication state, that is, when the rack 124 drives the gear 127 to rotate, the gear 127 needs to be driven to rotate by 90 °, and at this time, the length of the rack 124 is equal to one quarter of the circumference of the gear 127. Therefore, the sizes of the rack 124 and the gear 127 are required to correspond to each other, and are matched with the sizes of the air duct 125, the air outlet 123 and the air inlet 122 on the air door housing 121 and the rotary air door 120, so as to ensure that the rotary air door 120 can open or close the air supply duct 111 when the rack 124 drives the gear 127 to rotate.

The damper housing 121 according to the embodiment of the present invention may be configured as an integrally formed structure, or may be configured as two parts, i.e., a body 1211 and a cover plate 1212, as shown in fig. 4, the body 1211 is fixed on the abutting plate 134, the cover plate 1212 is detachably connected to the body 1211, and the rotary damper 120 is disposed in the body 1211. Compared with an integrally formed structure, the split structure of the body 1211 and the cover plate 1212 is more favorable for replacement or maintenance of the rotary air door 120 in the later period, the cover plate 1212 is preferably connected with the body 1211 through screws, and the cover plate 1212 can be conveniently taken down by unscrewing the screws.

Preferably, as shown in fig. 7, the damper support plate is further provided with a housing 140, and the screw 132, the nut 133, the rack 124 and the gear 127 are all disposed in the housing 140. By disposing the screw 132 and other components in the housing 140, the screw 132, the nut 133, the rack 124, and the gear 127 are protected, and the service life of the drive mechanism is prolonged.

In addition, the side of the casing 140 opposite to the damper support plate may be provided with a detachable cover structure, which facilitates maintenance or replacement of the internal screw 132, nut 133, and other components.

In order to make the overall structure of the screw 132 more stable when the screw 132 rotates, as shown in fig. 7, one end of the screw 132 provided in the embodiment of the present invention penetrates through a sidewall of the housing 140 to be connected to an output shaft of the driving motor 131, and the other end of the screw 132 is rotatably connected to another sidewall of the housing 140 opposite to the other sidewall. Screw 132 one end and the output shaft fixed connection who drives this motor, the other end sets up to rotate with the lateral wall of shell 140 and is connected to make screw 132 both ends all have the strong point, when screw 132 rotated, avoid producing to rock, make overall structure more firm.

Preferably, as shown in fig. 8, the driving mechanism further includes a motor protection housing 150, the driving motor 131 is disposed in the motor protection housing 150, and an output shaft of the driving motor 131 penetrates through an outer wall of the motor protection housing 150 and is connected to the screw 132. The driving motor 131 is disposed in the motor protective case 150, so that the driving motor 131 is protected, and the service life of the driving motor 131 is prolonged.

The refrigerator body 100 provided by the embodiment of the invention is provided with air duct foam 110 at the rear side of the inner container, as shown in fig. 1 and fig. 2, a plurality of air supply ducts 111 are arranged on the air duct foam 110, each air supply duct 111 is provided with an air supply opening 112, and the air supply openings 112 respectively correspond to the multi-layer storage space of the refrigerating chamber of the refrigerator body. The air duct 111 and the air supply opening 112 are arranged on the air duct foam 110, the air duct 111 is communicated with the multi-layer storage space of the refrigerating chamber of the refrigerator through the air supply opening 112, and therefore the air duct 111 is controlled to ventilate or close through the rotary air door 120 arranged on the air duct 111, layered air supply to each layer of storage space of the refrigerating chamber of the refrigerator is achieved, the storage temperature of each layer is adjusted, temperature fluctuation of the refrigerating chamber is reduced, and the fresh-keeping quality of food materials is improved.

In the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. A refrigerator comprises a refrigerator body and is characterized in that a plurality of air supply ducts are arranged on the rear side of an inner container in the refrigerator body and respectively correspond to a multi-layer storage space of a refrigerating chamber of the refrigerator body, rotary air doors are arranged in the air supply ducts, the rotary air doors are controlled by a group of driving mechanisms, and the driving mechanisms can respectively control the opening or the closing of the rotary air doors;

each rotary air door is provided with a gear, the top circles of the gears are provided with the same tangent line, the driving mechanism comprises a driving assembly and a rack, the driving assembly drives the rack to reciprocate along the direction parallel to the tangent line, and the rack can be driven to rotate by taking the motion direction as the axis;

the driving assembly comprises a driving motor, a screw rod, a nut and an abutting part, the screw rod is connected with an output shaft of the driving motor, the nut is sleeved on the screw rod and connected with the rack, and the axis of the screw rod is parallel to the movement direction of the rack;

when the driving motor rotates forwards, the nut drives the rack to rotate along with the screw rod, and when the rack rotates to a position where the rack can be meshed with the gear, the rack is blocked by the abutting part and moves towards a first direction along the axial direction of the screw rod;

when the driving motor rotates reversely, the nut drives the rack to rotate along with the screw rod, and when the rack rotates to a position dislocated with the gear, the rack is blocked by the abutting part and moves towards a second direction along the axial direction of the screw rod;

the butt joint piece is the butt joint board, the butt joint board be on a parallel with the back of box and with the axis of screw rod is parallel, the screw rod with the gear set up in one side of butt joint board, rotatory air door set up in the opposite side of butt joint board, the gear with through rotation axis connection between the rotatory air door.

2. The refrigerator according to claim 1, wherein the abutting plate is provided with a plurality of damper housings, the rotary damper is disposed in the damper housing, the damper housing is provided with an air inlet and an air outlet, the rotary damper is provided with an air duct, and the air duct is used for communicating the air inlet and the air outlet.

3. The refrigerator according to claim 2, wherein the rotary damper is of a cylindrical structure, an end surface of the cylindrical structure is parallel to the abutting plate, the ventilation duct is disposed in a radial direction of the cylindrical structure, and an axis of the rotary shaft coincides with an axis of the cylindrical structure.

4. The refrigerator of claim 3 wherein the damper housing has an interior cavity shaped to accommodate the cylindrical structure.

5. The refrigerator of claim 1, wherein the damper housing includes a housing body and a cover plate, the housing body is disposed on the abutting plate, the cover plate is detachably connected to the housing body, and the rotary damper is disposed in the housing body.

6. The refrigerator as claimed in claim 1, wherein the abutting plate is further provided with a housing, and the screw, the nut, the rack and the gear are all disposed in the housing.

7. The refrigerator as claimed in claim 6, wherein one end of the screw rod penetrates a side wall of the casing to be connected to the output shaft of the driving motor, and the other end of the screw rod is rotatably connected to the other opposite side wall of the casing.

8. The refrigerator according to claim 1, wherein the driving assembly further comprises a motor protection casing, the driving motor is disposed in the motor protection casing, and an output shaft of the driving motor penetrates through an outer wall of the motor protection casing and is connected to the screw.

9. The refrigerator according to any one of claims 1 to 8, wherein an air duct foam is provided at a rear side of the cabinet, a plurality of the air supply ducts are provided on the air duct foam, each of the air supply ducts is provided with an air supply port, and the plurality of air supply ports respectively correspond to the multi-layered storage space of the refrigerating chamber of the cabinet.