CN113863807A

CN113863807A - Refrigerator with a door

Info

Publication number: CN113863807A
Application number: CN202010621079.5A
Authority: CN
Inventors: 刘瑾; 马立明; 张书锋; 王凯; 刘志海; 杨洪光; 李全星; 王春青
Original assignee: Qingdao Haier Special Refrigerator Co Ltd; Haier Smart Home Co Ltd
Current assignee: Qingdao Haier Special Refrigerator Co Ltd; Haier Smart Home Co Ltd
Priority date: 2020-06-30
Filing date: 2020-06-30
Publication date: 2021-12-31

Abstract

The invention discloses a refrigerator, which comprises a refrigerator body, a door body rotationally connected to the refrigerator body, a door body pre-opening device for driving the door body to open by a preset angle, and an automatic door body closing device for driving the door body to close automatically, wherein based on the structure of the refrigerator provided by the invention, in a specific use scene of opening the door body of the refrigerator, when the door body is opened in advance, the matching between a top block and an adsorption matching block of the door body pre-opening device can ensure that the speed of the door body when the door body is opened is consistent with the moving speed of the top rod, thereby effectively avoiding the situations of quick bouncing of the door body and unstable operation in the prior art; when the door body is jacked open due to misoperation, the door body can be closed again through retraction of the jacking rod, so that the problem of large-amount leakage of the refrigerating capacity of the refrigerator due to misoperation is solved; in addition, the door body automatic closing device of the automatic door opening and closing refrigerator can drive the door body to be automatically closed after the door body is opened, so that the operation of a user is easier.

Description

Refrigerator with a door

Technical Field

The invention relates to the field of household appliances, in particular to a refrigerator.

Background

Along with the continuous improvement of the living standard of people, the smart home becomes the development trend which cannot be avoided at present, various products which accord with the smart home are produced, the refrigerator is used as an indispensable tool in modern home life and also becomes an important link of the smart home, and the intelligent and high-performance refrigerator becomes a market favorite. The door body of the existing refrigerator is opened by adopting a manual pulling mode, and when the adsorption force between the door body of the refrigerator and the refrigerator body is too small, the problems of poor sealing effect of the door body, leakage of cold air and the like are easily caused; when the adsorption force between the refrigerator door and the refrigerator body is too large, the problem that the door is difficult to open is easily caused.

In order to overcome the problems in the prior art, the adsorption force between the refrigerator door body and the refrigerator body can be overcome by adopting modes such as an ejector rod and the like so as to open the door body at a certain small angle, and then a user can open the door with small force while ensuring that the refrigerator has good sealing performance. However, the following problems exist in the prior art in which the push rod pre-opening door is adopted: in the process of opening the door body, the force which is applied to the door body by the ejector rod at the moment of opening the door body to overcome the adsorption of the door body is larger, the door body can be instantly and quickly flicked and separated from the end part of the ejector rod, so that the motion of the door body is unstable, and the stored objects at the inner side of the door body can be turned over and fallen; in addition, the situation that the door body is opened by jacking due to misoperation and cannot be closed automatically can also occur in the mode that the ejector rod is used for pre-opening the door.

In view of the above, there is a need to provide an improved solution to the above problems.

Disclosure of Invention

The invention aims to solve at least one technical problem in the prior art, and in order to achieve the aim of the invention, the invention provides a refrigerator which is specifically designed as follows.

A refrigerator comprises a refrigerator body and a door body rotationally connected to the refrigerator body, and further comprises a door body pre-opening device for driving the door body to open by a preset angle, wherein the door body pre-opening device comprises a push rod, a top block and an adsorption matching block, the push rod is located on the rear side of the door body and moves back and forth towards the direction of the door body, the top block is connected to one end, facing the door body, of the push rod, and the adsorption matching block is connected to the door body and matched with the top block so that the door body can be abutted to the top block when the top block jacks the door body; one of the top block and the adsorption matching block comprises an electromagnet, and the other one comprises a ferromagnetic body.

Further, the refrigerator has a first adsorption force for keeping the door body closed to the refrigerator body when the door body is closed and a second adsorption force for keeping the door body abutted to the top block when the top block jacks the door body to the preset angle, and the first adsorption force is larger than the second adsorption force.

Further, the door pre-opening device further comprises a first driving mechanism fixed to the box body to drive the ejector rod to move.

Further, the working current of the electromagnet at the moment when the door body is opened is larger than the working current when the door body is opened to the preset angle.

Further, the door body pre-opening device is further provided with a second driving mechanism which is fixed to the door body so as to drive the adsorption matching block to be far away from the ejecting block when the door body is opened by a preset angle.

Further, the ejector block is rotatably connected to the ejector rod along a vertical rotating shaft.

Furthermore, the ejector block comprises an accommodating box which is rotationally connected to the ejector rod along the vertical rotating shaft, the electromagnet or the ferromagnetic body is accommodated in the accommodating box, and the accommodating box is provided with a cover plate which covers the electromagnet or the ferromagnetic body and faces one side of the door body.

Further, the door body pre-opening device is also provided with a roller or a ball which is arranged on the cover plate and used for rolling and abutting against the door body.

The refrigerator further comprises a signal receiver for receiving a door opening signal sent by a user, a data processor for processing the signal received by the signal receiver, and a controller for controlling the door body pre-opening device to act according to the processing result of the data processor.

Further, the signal receiver is a voice receiver, a pressure sensor or a camera.

Further, the door body is rotatably connected to the box body along a rotating shaft, the door body automatic closing device comprises an upper cam and a lower cam, the upper cam synchronously rotates along with the door body, the lower cam is fixed to the box body, the upper cam and the lower cam are arranged in an upper and lower matching mode along the extending direction of the rotating shaft, and the upper cam and the lower cam are provided with a pair of matching surfaces which are matched with each other to drive the upper cam to rotate along the closing direction of the door body when the upper cam moves downwards.

Furthermore, the door body automatic closing device also comprises a spring which is arranged at the top of the upper cam in an extruding way so as to drive the upper cam to move downwards.

Further, the door body automatic closing device further comprises a mounting seat fixed to the door body and rotating synchronously along with the door body, the mounting seat is provided with a containing cavity for containing the upper cam, the lower cam and the spring, the mounting seat is provided with a top cover located at the top of the containing cavity for abutting against the upper end of the spring, and the lower cam is provided with a fixing part protruding out of the lower end of the containing cavity to be fixed to the box body.

Further, the side wall of the containing cavity is provided with at least one strip-shaped groove extending up and down, and the periphery of the upper cam is provided with protrusions which correspond to the strip-shaped grooves one by one and slide up and down along the strip-shaped grooves.

Further, the door body is rotatably connected to the box body along a rotating shaft, and the door body automatic closing device is a torsion spring which surrounds the rotating shaft to connect the box body and the door body.

The invention has the beneficial effects that: based on the structure of the refrigerator provided by the invention, in a specific use scene of opening the door body of the refrigerator, when the door body is opened in advance, the matching between the top block and the adsorption matching block of the door body pre-opening device can ensure that the speed of the door body when the door body is opened is consistent with the moving speed of the top rod, thereby effectively avoiding the situations of quick bouncing of the door body and unstable operation in the prior art; when the door body is jacked open due to misoperation, the door body can be closed again through retraction of the jacking rod, so that the problem of large-amount leakage of the refrigerating capacity of the refrigerator due to misoperation is solved; in addition, the door body automatic closing device of the automatic door opening and closing refrigerator can drive the door body to be automatically closed after the door body is opened, so that the operation of a user is easier.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a first angle schematic view of the overall structure of the refrigerator according to the present invention;

FIG. 2 is a schematic view of the structure of FIG. 1 with the housing removed;

FIG. 3 is a schematic view of a first angle of a door pre-opening apparatus according to the present invention;

fig. 4 is a schematic view showing a state before a top block and an adsorption matching block in the door body pre-opening device in fig. 3 are matched;

FIG. 5 is a schematic view of a second angle after explosion post-treatment of the door pre-opening apparatus of FIG. 3;

FIG. 6 is a schematic view of a door of an automatic opening and closing refrigerator being pushed to a predetermined angle;

fig. 7 is an enlarged view of a portion a of fig. 6.

FIG. 8 is a second perspective view of the overall structure of the refrigerator according to the present invention;

fig. 9 is a schematic structural view of an automatic door closing device;

FIG. 10 is a schematic exploded view of the automatic door closing apparatus of FIG. 9;

FIG. 11 is a further schematic illustration, broken away, of the embodiment shown in FIG. 10;

fig. 12 is a schematic structural view of the automatic door closing apparatus cut by a plane passing through a door body rotation axis.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, 2 and 6, the invention discloses a refrigerator, which comprises a refrigerator body 11 and a door body 12 rotatably connected to the refrigerator body 11. The refrigerator according to the present invention further includes a door pre-opening apparatus 200 and a door automatic closing apparatus 300. The door pre-opening device 200 is used for opening the door 12 by a preset angle when a user manually opens the door in a front-driving manner, and the door automatic closing device 300 is used for driving the door 12 to automatically close. The preset angle referred to in the present invention generally has a small value, and for example, the preset angle may be set in the range of 5 to 10 °.

In the present invention, as shown in fig. 2, 3 and 4, the door pre-opening apparatus 200 includes a jack 21 located at the rear side of the door 12 and moving forward and backward in the direction of the door, a top block 23 connected to one end of the jack 21 facing the door 12, and an adsorption fitting block 24 connected to the door 12 and fitted to the top block 23 to keep the door 12 abutting against the top block 23 when the top block 23 pushes the door 12 open. One of the top block 23 and the adsorption matching block 24 includes an electromagnet, and the other includes a ferromagnetic body.

It is understood that in the present invention, the ferromagnetic body is made of a ferromagnetic material, which may be a permanent magnet, or other ferromagnetic materials (e.g., iron block, etc.) that can be attracted by the permanent magnet. The electromagnet can generate a magnetic field for adsorbing the ferromagnetic body after being electrified.

In an embodiment of the refrigerator of the present invention, referring to fig. 1 and 2, the refrigerator body 11 has an inner container 110 constituting a refrigerating compartment thereof, and the door pre-opening device 200 is disposed at an outer side of a top portion of the inner container 110. It is understood that in other embodiments of the present invention, the door pre-opening device 200 may be disposed at other positions where the door can be opened by a predetermined angle, and is not limited to the position shown in fig. 2.

Based on the structure of the refrigerator provided by the invention, in a specific use scene of opening the door body 12 of the refrigerator, when the door body 12 is opened in advance, the electromagnet is electrified, the top block 23 and the adsorption matching block 24 of the door body pre-opening device 200 are mutually adsorbed, so that the door body 24 can be kept to be abutted to the top block 23, the speed of opening the door body 12 is consistent with the moving speed of the ejector rod 21, and the situations of quick bouncing of the door body and unstable operation in the prior art are effectively avoided; when the door body 12 is ejected due to misoperation, the door body can be closed again through the retraction action of the ejector rod 21 because the ejector block 23 and the adsorption matching block 24 are mutually adsorbed, so that the problem of large-amount leakage of the refrigerating capacity of the refrigerator due to misoperation is avoided.

One specific configuration of the door pre-opening apparatus 200 is further developed as follows:

the refrigerator according to the present invention has a first suction force for keeping the door 12 closed to the cabinet 11 when the door 12 is closed and a second suction force for keeping the door 12 in contact with the top block 23 when the top block 23 pushes the door 12 to a predetermined angle. Generally, the first suction force is provided by a suction member (not shown) between the cabinet 11 and the edge of the door 12, which is a key factor for ensuring the door 12 is tightly sealed; the second suction force is generated by the mutual attraction between the top block 23 and the suction-engagement block 24, and the door body 12 can be brought into contact with the top block 23 based on the second suction force. In the present invention, as a preferred embodiment, the first adsorption force referred to above is greater than the second adsorption force, so that after the door 12 is pre-opened to a preset angle by the door pre-opening device 200, the user can open the door 12 further to the full opening by applying a relatively small pulling force on the door 12.

Referring to fig. 3 and 4, the door pre-opening apparatus 200 according to the present invention further includes a first driving mechanism 22 fixed to the box 11 for driving the lift rod 21 to move, wherein the moving direction of the lift rod 21 is the same as the length direction thereof. In a specific implementation process, the first driving mechanism is a motor.

As a further preferred aspect of the present invention, the operating current of the electromagnet at the moment when the door 12 is opened is larger than the operating current when the door 12 is opened to a predetermined angle. It can be understood that the magnetic field intensity of the electromagnet is in direct proportion to the working current, and therefore, the door body 12 can be ensured not to separate from the top block 23 to bounce open at the moment when the door body 12 is opened; after the door body is opened by a preset angle, the adsorption force between the top block 23 and the adsorption matching block 24 has a small value, so that a user can completely open the door body 12 by applying a small pulling force on the door body 12.

As still another preferred embodiment of the present invention, the door pre-opening apparatus 200 further has a second driving mechanism (not shown) fixed to the door 12 to drive the suction fitting block 24 away from the top block 23 when the door 12 is opened at a predetermined angle. Based on this setting, when the door body 12 is opened and is predetermineeing the angle, because the kicking block 23 is kept away from to second actuating mechanism drive adsorption coordination block 24, even the operating current that the electromagnetism fell is unchangeable, also can make the adsorption affinity between adsorption coordination block 24 and the kicking block 23 diminish, and then the external force of exerting on the door body 12 when the user opens the door body 12 completely also can be very little to it is easier to make the door body open, can greatly reduce the door body 12 and open the unstability of in-process completely.

As further preferred, in the present embodiment, as shown in fig. 3 and 4, the top block 23 is rotatably connected to one end of the top bar 21 facing the door body 12 along a vertical rotating shaft O-O'. Generally, the top block 23 has an abutment surface for directly abutting against the rear side surface of the door body 12. When the door body 12 is pushed open, the plane of the rear side surface of the door body 12 gradually deviates, and the top block 23 is rotatably connected to the top rod 21 along a vertical rotating shaft O-O', so that the maximum contact area is kept between the rear side surface of the door body 12 and the abutting surface, and the rear side surface of the door body 12 is prevented from being damaged due to overlarge local pressure.

Referring to fig. 5, the top block 23 according to this embodiment includes a ferromagnetic body 230, and the suction-fit block 24 includes an electromagnet. The top block 23 according to the present embodiment includes a housing case 231 rotatably connected to the lift rod 21 along a vertical rotation axis O-O', the ferromagnetic member 230 is housed in the housing case 231, the housing case 231 has a cover plate 232 covering the side of the ferromagnetic member 230 facing the door body 12, and the cover plate 232 constitutes an abutting surface of the top block 23 abutting against the rear surface of the door body 12. Based on the arrangement of the cover plate 232, the ferromagnetic body 230 can be prevented from directly contacting the door body 12, and the ferromagnetic body 230 can be prevented from scratching the inner side surface of the door body 12. Typically, the cover plate 232 may be made of a relatively low durometer plastic material or the like.

It is understood that in other embodiments of the present invention, the top block 23 may include an electromagnet, and the suction fitting block 24 may include a ferromagnetic body, such that the electromagnet is accommodated in the accommodating box 231, and the ferromagnetic body is connected to the door 12.

In the specific implementation process, as shown in fig. 6 and 7, a through hole is further formed on the front side surface of the box 11 for the ejector rod 21 to extend out so that the ejector block 23 abuts against the rear side surface of the door body 12.

As a further preferred feature of the present invention, in some embodiments, the top block 23 further has rollers or balls (not shown) disposed on the cover plate 232 for rolling contact with the door body 12. The jacking block 23 and the door body 12 can generate relative displacement in the jacking process of the door body 12, and the rolling and abutting arrangement mode can further avoid the problem that the door body 12 is scratched by the jacking block 23.

It is understood that the refrigerator according to the present invention may further have a signal receiver, a data processor, and a controller. The specific door opening mode of the refrigerator is that the signal receiver is used for receiving a signal which is sent by a user and needs to open a door, the signal is processed by the data processor and then transmitted to the controller, the controller controls the door body pre-opening device 200 to act to realize small-angle opening (namely, opening a preset angle), and then the user can manually pull the door to complete the door opening action. In a specific implementation process, the signal receiver may be a voice receiver for receiving voice of a user, or may be a device capable of receiving signals and transmitting the received signals to the data processor, such as a pressure sensor for receiving touch operation or press operation of the user, a camera, or the like.

Usually, a door body pre-opening device operation control program can be preset in the controller, and the operation control program comprises the following steps: the door body pre-opening device is started, and the ejector rod 21 moves towards the direction of the door body 12 at a set speed for a set distance; locking the current position of the ejector rod 21 to set time; the jack 21 retreats from the current position. In a specific implementation process, the set time range of the locking of the ejector rod 21 can be 3s-10 s. Based on this control program, when the door body 12 is pushed open by an erroneous operation, the door body 12 can be retracted synchronously with the plunger 21 until closed by the attraction force between the attraction engagement block 24 and the plunger 23 when the plunger 21 is retreated from the current position.

It is understood that in the application scenario of the specific refrigerator, the related actions of the first driving mechanism and the second driving mechanism are controlled by the controller. In the specific implementation process, when the ejector rod 21 moves towards the direction of the door body 12, the electromagnet is electrified; when the door body 12 is opened to a preset angle, the working current of the electromagnet is reduced or the electromagnet is directly powered off. If the electromagnet is directly powered off when the door body 12 is opened to a preset angle, the electromagnet is powered on again after the set time, and therefore the door body 12 can be ensured to be synchronously retracted along with the ejector rod 21 until being closed when being opened by mistake.

A specific structure of the door automatic closing apparatus 300 according to the present invention will be described below with reference to fig. 8, 9, 10, 11, and 12.

It is understood that the door 12 according to the present invention is rotatably coupled to the cabinet 11 along a rotation axis. In the present embodiment, referring to the figures, the door automatic closing apparatus 300 includes an upper cam 34 rotating synchronously with the door 12 and a lower cam 33 fixed to the housing 11, the upper cam 34 and the lower cam 33 are disposed in an upward and downward fit along the extending direction of the rotating shaft of the door 12, and the upper cam 34 and the lower cam 33 have a pair of fitting surfaces that cooperate with each other to drive the upper cam 34 to rotate in the door closing direction when the upper cam 34 moves downward.

More specifically, the lower cam 33 has a first engagement surface 331 disposed obliquely, and the upper cam 34 has a second engagement surface 341 engaged with the first engagement surface 331. When the door body 12 is opened, the upper side portion of the first engagement surface 331 engages with the lower side portion of the second engagement surface 341; when the upper cam 34 moves downward, the second engagement surface 341 slides relative to the first engagement surface 331, so that the door body 12 rotating in synchronization with the upper cam 34 is gradually closed.

The refrigerator according to the present invention can drive the door 12 to automatically close after the door 12 is opened by the automatic closing apparatus 300, so that the operation of the user is easier.

In the implementation process, the lower cam 33 has a column rod 333 protruding upwards along the extension direction of the rotation shaft, and the upper cam 34 is sleeved on the column rod 333 to perform the rotation and up-and-down movement.

As a preferred embodiment of the present invention, as shown in fig. 10 to 12, the door automatic-closing apparatus 300 further includes a spring 36 which is press-fitted on the top of the upper cam 34 to urge the upper cam 34 to move down.

It is understood that in other embodiments of the present invention, the downward force of the upper cam 34 can be provided by the weight of the door body 12, and in particular, no further expansion is performed.

In this embodiment, the door automatic closing apparatus 300 further includes a mounting seat 32 fixed to the door 12 and rotating synchronously with the door 12, the mounting seat 32 has a receiving cavity 320 for receiving an upper cam 34, a lower cam 33 and a spring 36, the mounting seat 32 has a top cover 35 located on the top of the receiving cavity 320 for abutting against the upper end of the spring 36, and the lower cam 33 has a fixing portion 332 protruding beyond the lower end of the receiving cavity 320 and fixed to the box 11.

In the implementation process, the top cover 35 is detachably mounted on the top of the receiving cavity 320, so that the assembling operation of the components inside the receiving cavity 320 can be facilitated.

As further shown in the drawings, in this embodiment, the door automatic closing apparatus 300 further includes a fixing plate 31 located at a lower side of the door 12 and fixed to the box 11, and the fixing portion 332 of the lower cam 33 is fixed to the fixing plate 31, so as to realize a fixed connection between the lower cam 33 and the box 11.

In this embodiment, in order to enable the upper cam 34 to rotate synchronously with the door 12 and to move up and down, at least one strip-shaped groove 321 extending up and down is formed in the side wall of the accommodating chamber 320, and the peripheral edge of the upper cam 34 has protrusions 342 corresponding to the strip-shaped groove 321 one by one and sliding up and down along the strip-shaped groove 321.

In another embodiment of the present invention, the door automatic closing apparatus 300 is a torsion spring that surrounds the rotation shaft to connect the cabinet 11 and the door 12. The torsion spring can provide a restoring force for driving the door body 12 to return to the closed state.

It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments can also be combined appropriately to form other embodiments understood by those skilled in the art.

The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.

Claims

1. A refrigerator comprises a refrigerator body and a door body rotationally connected to the refrigerator body, and is characterized by further comprising a door body pre-opening device and a door body automatic closing device, wherein the door body pre-opening device is used for driving the door body to open by a preset angle, the door body automatic closing device is used for driving the door body to automatically close, the door body pre-opening device comprises a push rod, a top block and an adsorption matching block, the push rod is located on the rear side of the door body and moves back and forth towards the direction of the door body, the top block is connected to one end, facing the door body, of the push rod, the adsorption matching block is connected to the door body and matched with the top block, and the door body is kept abutted to the top block when the top block jacks the door body; one of the top block and the adsorption matching block comprises an electromagnet, and the other one comprises a ferromagnetic body.

2. The refrigerator according to claim 1, wherein the refrigerator has a first suction force that keeps the door body closed to the cabinet when the door body is closed and a second suction force that keeps the door body abutted to the top block when the top block ejects the door body to the preset angle, and the first suction force is greater than the second suction force.

3. The refrigerator according to claim 1, wherein the door pre-opening apparatus further comprises a first driving mechanism fixed to the cabinet to drive the knock bar to move.

4. The refrigerator according to claim 1, wherein the operating current of the electromagnet at the moment when the door body is opened is larger than the operating current when the door body is opened to the preset angle.

5. The refrigerator according to any one of claims 1 to 4, wherein the door pre-opening device further has a second driving mechanism fixed to the door to drive the adsorption fitting block away from the top block when the door is opened at a predetermined angle.

6. The refrigerator as claimed in any one of claims 1 to 4, wherein the top block is rotatably coupled to the knock bar along a vertical rotation shaft.

7. The refrigerator as claimed in claim 6, wherein the top block includes a receiving box rotatably connected to the top bar along the vertical rotation axis, the electromagnet or the ferromagnetic body is received in the receiving box, and the receiving box has a cover plate covering a side of the electromagnet or the ferromagnetic body facing the door body.

8. The refrigerator according to claim 7, wherein the door pre-opening device further comprises a roller or a ball disposed on the cover plate for rolling and abutting against the door.

9. The refrigerator according to any one of claims 1 to 4, further comprising a signal receiver for receiving a door opening signal sent by a user, a data processor for processing the signal received by the signal receiver, and a controller for controlling the door pre-opening device to operate according to the processing result of the data processor.

10. The refrigerator of claim 9, wherein the signal receiver is a voice receiver, a pressure sensor, or a camera.

11. The refrigerator according to any one of claims 1 to 4, wherein the door is rotatably connected to the cabinet along a rotation axis, the door automatic closing apparatus includes an upper cam that rotates synchronously with the door and a lower cam that is fixed to the cabinet, the upper cam and the lower cam are disposed to be engaged up and down along an extension direction of the rotation axis, and the upper cam and the lower cam have a pair of engagement surfaces that are engaged with each other to drive the upper cam to rotate in a door closing direction when the upper cam moves down.

12. The refrigerator according to claim 11, wherein the door automatic closing apparatus further comprises a spring which is provided at a top of the upper cam in a pressing manner to drive the upper cam to move downward.

13. The refrigerator according to claim 12, wherein the door automatic closing apparatus further comprises a mounting seat fixed to the door and rotating synchronously with the door, the mounting seat has a receiving cavity for receiving the upper cam, the lower cam and the spring, the mounting seat has a top cover located at the top of the receiving cavity for abutting against the upper end of the spring, and the lower cam has a fixing portion protruding beyond the lower end of the receiving cavity to be fixed to the refrigerator body.

14. The refrigerator as claimed in claim 13, wherein the sidewall of the receiving cavity is formed with at least one strip-shaped groove extending up and down, and the periphery of the upper cam has protrusions corresponding to the strip-shaped groove one by one to slide up and down along the strip-shaped groove.

15. The refrigerator according to any one of claims 1 to 4, wherein the door is rotatably connected to the cabinet along a rotating shaft, and the door automatic closing device is a torsion spring surrounding the rotating shaft to connect the cabinet and the door.