Automatic door opening device and refrigerator

Abstract

The invention discloses an automatic door opening device and a refrigerator, the automatic door opening device comprises a shell, the shell is internally provided with a power device, and the output end of the power device is connected with a top door assembly; the power device is used for driving the top door assembly to axially move so as to open a door; an elastic assembly is arranged between the end, away from the top door assembly, of the power device and the corresponding shell and used for resetting the power device. The first limiting device is used for fixing the end, away from the power device, of the top door assembly; and the second limiting device is used for fixing the power device. In this way, when the door suddenly wants to be closed in the door opening process, the second limiting device is recovered, the elastic assembly drives the power device and the door jacking assembly to rapidly return and reset, and therefore the door jacking assembly cannot hinder the door closing process of the door, the door can be rapidly responded in the opening process to be immediately closed, and the user experience feeling is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of locks, and in particular to an automatic door opening device and a refrigerator. Background Art

[0002] As people's living standards improve, the demand for intelligence in home appliances such as refrigerators is also further enhanced. Therefore, many high-end refrigerators on the market are equipped with automatic door opening devices, but most of the automatic door opening devices focus on fast automatic opening and closing of doors.

[0003] Among them, the electric push rod equipped with a reduction motor in the automatic door opening device controls the pushing and retracting actions of the door body through a program. However, in order to avoid damage to the reduction mechanism or gears caused by mechanical impact when switching directions (such as gear wear or component breakage), the direction switching operation must be performed after the motor stops completely; therefore, the program will add a delay (usually implemented by a time relay) after pushing the push rod out to ensure that the retraction action is started after the motor stops.

[0004] Although this static period (i.e. the delay in the push rod remaining stationary after being pushed out) protects the equipment, it prolongs the total time of the door closing process. However, it does not take into account the user's complex usage scenarios. For example, if the user suddenly wants to close the refrigerator door during the automatic door opening process, the automatic door opening device (equivalent to the push rod) will hinder the user and the user will not be able to respond quickly and close the door immediately. The user must wait for the static period before closing the door, resulting in a long waiting time and a poor user experience. Summary of the Invention

[0005] The present invention provides an automatic door opening device and a refrigerator, which are used to solve the problem in the prior art that the automatic door opening device cannot quickly respond and immediately close the door during the door opening process, resulting in a long waiting time and a poor user experience.

[0006] The technical solution of the present invention is an automatic door opening device, comprising a housing, wherein the housing is provided with:

[0007] A power device, the output end of which is connected to the top door assembly; the power device is used to drive the top door assembly to move axially to open the door;

[0008] An elastic component is provided between one end of the power device away from the top door component and the corresponding housing, and is used to reset the power device;

[0009] a first limiting device for fixing one end of the top door assembly away from the power device;

[0010] The second limiting device is used to fix the power device.

[0011] Furthermore, the automatic door opening device also includes an angular velocity detection device installed on the door hinge shaft, and the angular velocity detection device is used to detect the angular velocity of the door and obtain the opening and closing state and direction of the door.

[0012] Furthermore, a first accommodating groove is axially provided in the shell, and a power device, a top door assembly and an elastic assembly are matched and placed in the first accommodating groove, and the power device and the top door assembly can move in the first accommodating groove.

[0013] Furthermore, the first limiting device includes a first driving structure and a first limiting rod;

[0014] The output end of the first driving structure is connected to a first limiting rod;

[0015] The first driving structure drives the first limiting rod to move in a direction perpendicular to the displacement direction of the top door assembly until the end of the top door assembly is fixed away from the power device.

[0016] Furthermore, the shell is provided with a second accommodating groove corresponding to the first limiting device, the first limiting device is placed in the second accommodating groove, and the first limiting device performs telescopic movement in the second accommodating groove, and the second accommodating groove is communicated with the first accommodating groove.

[0017] Furthermore, the second limiting device includes a second driving structure and a second limiting rod;

[0018] The output end of the second driving structure is connected to a second limiting rod;

[0019] The second driving structure drives the second limiting rod to move in a direction perpendicular to the displacement direction of the top door assembly until the power device is fixed.

[0020] Furthermore, the shell is matched with a third accommodating groove corresponding to the second limiting device, the second limiting device is placed in the third accommodating groove, and the second limiting device performs telescopic movement in the third accommodating groove, and the third accommodating groove is connected to the first accommodating groove.

[0021] Furthermore, the first limiting device and the second limiting device are located on the same side of the power device.

[0022] Furthermore, the elastic component is any one of a tension spring, a torsion spring or a rubber spring.

[0023] The present invention also provides a refrigerator, comprising the automatic door opening device described above.

[0024] Compared with the prior art, the present invention has at least the following beneficial effects:

[0025] The present invention achieves mutual coordination among the power device, the top door assembly, the elastic assembly, the first limit device and the second limit device. When the door is suddenly closed during the process of opening, the second limit device is retracted, and the elastic assembly drives the power device and the top door assembly to quickly retract and reset, so that the top door assembly will not hinder the closing process of the door, so that the door can respond quickly and close immediately during the opening process, thereby improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as commonly understood by those skilled in the art to which this invention belongs. The terms used in the specification of the application are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the accompanying drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of the present invention and the accompanying drawings are used to distinguish different objects, not to describe a specific order.

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 A partial internal top view of the first automatic door opening device proposed by the present invention in an initial state;

[0029] Figure 2 A partial internal top view of the first automatic door opening device proposed by the present invention in a first door opening preparation state;

[0030] Figure 3 A partial internal top view of the first automatic door opening device proposed by the present invention in a second door opening preparation state;

[0031] Figure 4 A partial top view of the interior of the first automatic door opening device proposed by the present invention when it is fully opened;

[0032] Figure 5 A partial internal top view of the second automatic door opening device proposed by the present invention in its initial state;

[0033] Figure 6 A top view of the interior of a first portion of the refrigerator provided by the present invention;

[0034] Figure 7A second partial internal plan view of the refrigerator provided by the present invention;

[0035] Figure 8 This is a flow chart of the automatic door opening device proposed by the present invention.

[0036] Reference numerals:

[0037] 10. Housing;

[0038] 101, first receiving slot; 102, second receiving slot; 103, third receiving slot;

[0039] 20. Power plant;

[0040] 30. Top door assembly

[0041] 40. Elastic components;

[0042] 50. First limit device;

[0043] 501, first driving structure; 502, first limiting rod;

[0044] 60. Second limit device;

[0045] 601, second driving structure; 602, second limiting rod;

[0046] 70. Angular velocity detection device;

[0047] 80. Refrigerator door;

[0048] 90. Refrigerator cabinet. DETAILED DESCRIPTION

[0049] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely used to explain the present invention and are not intended to limit the present invention. Thus, a feature indicated in this specification will be used to illustrate one of the features of an embodiment of the present invention, rather than implying that each embodiment of the present invention must have the described features. In addition, it should be noted that this specification describes many features. Although certain features can be combined together to illustrate possible system designs, these features can also be used in other combinations that are not explicitly stated. Thus, unless otherwise stated, the described combinations are not intended to be limiting.

[0050] The principle and structure of the present invention are described in detail below with reference to the accompanying drawings and embodiments.

[0051] Among them, the electric push rod equipped with a reduction motor in the automatic door opening device in the prior art controls the pushing and retracting actions of the door body through a program. However, in order to avoid damage to the reduction mechanism or gears caused by mechanical impact when switching directions (such as gear wear or component breakage), the direction switching operation must be performed after the motor stops completely; therefore, the program will add a delay (usually implemented by a time relay) after pushing out the push rod to ensure that the retraction action is started after the motor stops.

[0052] Although this static period (i.e. the delay in the push rod remaining stationary after being pushed out) protects the equipment, it prolongs the total time of the door closing process. However, it does not take into account the user's complex usage scenarios. For example, if the user suddenly wants to close the refrigerator door during the automatic door opening process, the automatic door opening device (equivalent to the push rod) will hinder the user and the user will not be able to respond quickly and close the door immediately. The user must wait for the static period before closing the door, resulting in a long waiting time and a poor user experience.

[0053] Therefore, in some embodiments, in order to solve the problem that the automatic door opening device cannot quickly respond to close the door immediately during the door opening process, resulting in a long waiting time and poor user experience, Figure 1 and Figure 4 As shown, the present invention provides an automatic door opening device, including a housing 10, wherein the housing 10 is provided with:

[0054] The power device 20 has an output end connected to the top door assembly 30; the power device 20 is used to drive the top door assembly 30 to move axially to open the door;

[0055] An elastic component 40 is provided between one end of the power device 20 away from the top door component 30 and the corresponding housing 10 , and is used to reset the power device 20 ;

[0056] a first limiting device 50 for fixing one end of the top door assembly 30 away from the power device 20;

[0057] The second limiting device 60 is used to fix the power device 20 .

[0058] It will be understood that the door lift assembly 30 proposed in this embodiment is equivalent to a push rod; the power unit 20 is used to convert other forms of energy (such as electrical energy) into mechanical energy, providing a power source for the system. Its essence is an energy conversion device. The power unit 20 is preferably a motor (such as a DC motor or an AC motor) to directly convert electrical energy into mechanical energy for linear motion. The automatic door opening device proposed in this embodiment also includes a main control unit (not shown, the same applies throughout), which is electrically connected to the power unit 20, the first limit device 50, and the second limit device 60.

[0059] The door proposed in this embodiment can be opened and closed relative to the box or wall, and an automatic door opening device is installed in the box or wall. The automatic door opening device is used to automatically open the door, and the user needs to manually close the door when closing the door.

[0060] It should be noted that the power device 20, the top door assembly 30 and the elastic assembly 40 proposed in this embodiment are in the same axial direction.

[0061] In this way, the automatic door opening device has the following states:

[0062] First, as Figure 1 As shown, when the automatic door opening device is in the initial state, the door is closed relative to the box or wall, and the elastic component 40 is in a natural state (no elastic deformation occurs); the power device 20 pushes the top door component 30 completely out so that the end of the top door component 30 away from the power device 20 contacts the door, but there is no force interaction. At this time, the top door component 30 will not open the door; the first limiting device 50 and the second limiting device 60 are both in a retracted state (equivalent to the first limiting device 50 not fixing the end of the top door component 30 away from the power device 20, and the second limiting device 60 not fixing the power device 20).

[0063] Second, if Figure 2 As shown, when the automatic door opening device receives the door opening signal and is in the door opening preparation state, the main control unit controls the first limit device 50 to open and fix the end of the top door assembly 30 away from the power device 20, so that the top door assembly 30 is fixed and cannot move; then the main control unit starts the power device 20 to enter the recovery state, so that under the interaction of forces, the power device 20 will move toward the top door assembly 30 for recovery until the top door assembly 30 is recovered and the elastic component 40 is in a stretched state (elastic deformation occurs); Figure 3 As shown, the main control unit then controls the second limiting device 60 to open so that it fixes the outer shell of the power device 20 and prevents the power device 20 from moving. The main control unit then controls the first limiting device 50 to retract to release the fixation of the top door assembly 30 away from one end of the power device 20.

[0064] Third, if Figure 4 As shown, the automatic door opening device is in the door opening stage. At this time, after the main control unit receives the opening completion signal of the second limit device 60 and the recovery completion signal of the first limit device 50, it will control the power device 20 to push the top door assembly 30 outward, so that the top door assembly 30 opens the door and completes the purpose of automatic opening of the door.

[0065] If the user suddenly wants to close the door while the door is opening (equivalent to the door not being fully opened), the main control unit will control the retraction of the second limit device 60 after receiving this signal, and release the fixation of the power device 20. At this time, the elastic component 40 will drive the power device 20 to quickly return to the initial state due to its own elastic deformation. Of course, the top door component 30 will also quickly return to the shell 10 following the power device 20, so that the top door component 30 will not hinder the closing process of the door. The user can close the door directly by hand without waiting for the motor to stop, thereby improving the user experience.

[0066] Of course, when the top door assembly 30 quickly retreats into the shell 10 following the power device 20, because the power device 20 has not completely pushed out the top door assembly 30, the main control unit will still control the power device 20 to push the top door assembly 30 outward until it is completely pushed out (such as the initial state); then wait for the next door opening command from the main control unit.

[0067] Therefore, the present invention uses the mutual coordination between the power device 20, the top door assembly 30, the elastic assembly 40, the first limit device 50 and the second limit device 60. When the door is suddenly opened and the user suddenly wants to close the door, the second limit device 60 is retracted, and the elastic assembly 40 drives the power device 20 and the top door assembly 30 to quickly retract and reset, so that the top door assembly 30 will not hinder the closing process of the door, so that the door can respond quickly and close immediately during the opening process, thereby improving the user experience.

[0068] In some embodiments, as Figure 1 As shown, the automatic door opening device also includes an angular velocity detection device 70 installed on the door hinge shaft. The angular velocity detection device 70 is used to detect the angular velocity of the door and obtain the opening and closing state and direction of the door.

[0069] It should be noted that the angular velocity detection device 70 proposed in this embodiment is electrically connected to the main control unit, and the angular velocity detection device 70 is preferably a gyroscope. The axial direction of the door hinge shaft proposed in this embodiment is the Z axis, and the X axis and Y axis are respectively perpendicular to the Z axis. Using the right-hand rule (when the bending direction of the four fingers is consistent with the rotation direction, the direction of the thumb is the direction of the angular velocity vector. If the direction is the same as the positive axis of the coordinate system (such as the Z axis of the Cartesian coordinate system), it is positive, and if it is opposite, it is negative), when the door rotates counterclockwise, ω>0, it is an opening action, and when the door rotates clockwise, ω<0, it is a closing action (ω is the angular velocity of the door, the same throughout the text); and the positive and negative values ​​of the angular velocity ω essentially represent the relationship between the rotation direction and the reference axis of the selected coordinate system, rather than "less than zero" in a numerical sense.

[0070] Thus, when the door is opening, the angular velocity detection device 70 detects the door's angular velocity ω in real time and uploads it to the main control unit. At this time, the top door assembly 30 is pushed out at a constant speed v1, and the angular velocity detection device 70 detects the door's angular velocity ω1:

[0071]

[0072] Wherein, r is the distance from the top door assembly 30 to the door hinge axis.

[0073] If the angular velocity detection device 70 detects that ω is less than the first preset angular velocity ω3, the door closing command is immediately triggered (equivalent to the main control unit determining that the door needs to be closed suddenly during the opening process). At this time, the main control unit will control the second limit device 60 to retract, release the fixation of the power device 20, and then the elastic component 40 will drive the power device 20 to quickly return to the initial state due to its own elastic deformation. Of course, the top door component 30 will also quickly return to the shell 10 with the power device 20, so that the top door component 30 will not hinder the closing process of the door, so that the door can respond quickly and close immediately during the opening process, thereby improving the user experience.

[0074] It should be noted that when a user closes the door (equivalent to manually pushing the door in the opposite direction), a negative torque is applied to the door. This negative torque offsets or reduces the positive torque generated by the door assembly 30, thereby reducing the angular velocity ω, causing the door's angular velocity ω to decrease or even reverse. Furthermore, by conducting door-pushing tests on multiple user groups (e.g., elderly and children, young adults, etc.), the minimum door-pushing angular velocity ω4 for each user group was calculated, where ω3 = ω1 - ω4.

[0075] Of course, there are also the following situations:

[0076] First, when the door is opening, when the angular velocity detection device 70 detects that ω> the second preset angular velocity ω2 (ω2> ω1), the main control unit will determine that the power device 20 has not completely pushed out the top door assembly 30, and the user has already opened the door. At this time, the main control unit will immediately shut down the power device 20 to stop the top door assembly 30 from being pushed out, and at the same time control the second limit device 60 to retract to release the fixation of the power device 20. At this time, the elastic component 40 will drive the power device 20 and the top door assembly 30 to retreat quickly due to its own elastic deformation. After the retreat is completed, the power device 20 continues to push the top door assembly 30 outward until it is completely pushed out, thereby restoring the automatic door opening device to its initial state and waiting for the next door opening command from the main control unit.

[0077] When the door assembly 30 is opening, the door already has an angular velocity of ω1. The direction of the hand pulling the door aligns with the direction of the door's motion, exerting a positive torque on the door. When the torque exerted by the hand is greater than the resistance torque, positive angular acceleration is generated, increasing the angular velocity, i.e., ω2 > ω1. Door-pulling tests are conducted on multiple user groups (e.g., elderly and children, young adults, etc.) to calculate the minimum positive torque ω0 for each user group, setting ω2 = ω1 + ω0.

[0078] Secondly, after the door is fully opened, the top door assembly 30 remains extended and stationary, and the door is also stationary. At this time, if the angular velocity detection device 70 detects that ω>0, the main control unit will determine that the user has opened the door, and will control the second limit device 60 to retract to release the fixation of the power device 20. At this time, the elastic component 40 will drive the power device 20 and the top door assembly 30 to quickly return to the initial state due to its own elastic deformation. Of course, at this time, because the door has not been closed, the end of the top door assembly 30 away from the power device 20 has not yet contacted the door; then wait for the next door opening command issued by the main control unit.

[0079] In some embodiments, as Figure 1 As shown, a first accommodating groove 101 is axially provided in the shell 10 , and the power device 20 , the top door assembly 30 and the elastic assembly 40 are matched and placed in the first accommodating groove 101 , and the power device 20 and the top door assembly 30 can move in the first accommodating groove 101 .

[0080] It should be noted that the first receiving groove 101 proposed in this embodiment is axially provided with the elastic component 40 , the power device 20 and the top door assembly 30 in sequence along the pushing direction of the top door assembly 30 .

[0081] In this way, this embodiment uses the physical constraint of the first accommodating groove 101 to enable the power device 20 and the top door assembly 30 to move axially along the first accommodating groove 101, ensuring the stability and predictability of the movement path to achieve the purpose of precise door opening.

[0082] In some embodiments, to ensure that the first limiting device 50 can stably fix the top door assembly 30 away from one end of the power device 20, as shown in FIG. Figure 1 As shown, the first limiting device 50 includes a first driving structure 501 and a first limiting rod 502;

[0083] The output end of the first driving structure 501 is connected to a first limiting rod 502;

[0084] The first driving structure 501 drives the first limiting rod 502 to move in a direction perpendicular to the displacement direction of the top door assembly 30 until fixing one end of the top door assembly 30 away from the power device 20 .

[0085] It should be noted that the first driving structure 501 proposed in this embodiment is preferably a motor, and the first driving structure 501 is electrically connected to the main control unit.

[0086] In this way, when it is necessary to fix one end of the top door assembly 30 away from the power device 20, the main control unit will start the first driving structure 501, so that the first driving structure 501 drives the first limiting rod 502 to extend, that is, move toward the end of the top door assembly 30 away from the power device 20, until the first limiting rod 502 presses the end of the top door assembly 30 away from the power device 20 against the groove wall of the first accommodating groove 101, so as to prevent the end of the top door assembly 30 away from the power device 20 from loosening and affecting the normal operation of the entire automatic door opening device.

[0087] When it is necessary to release the fixation of the top door assembly 30 away from the end of the power device 20, the main control unit will drive the first limit rod 502 to retract (equivalent to recovery, the same throughout) through the first driving structure 501 until it is reset.

[0088] In a further embodiment, Figure 1 As shown, the shell 10 is matched with a second accommodating groove 102 corresponding to the first limiting device 50, the first limiting device 50 is placed in the second accommodating groove 102, and the first limiting device 50 performs telescopic movement in the second accommodating groove 102, and the second accommodating groove 102 is communicated with the first accommodating groove 101.

[0089] It is understandable that if the first receiving groove 101 extends along the X-axis direction, then the second receiving groove 102 extends along the Y-axis direction. Of course, it can also extend in other directions, which is not limited here.

[0090] In this way, this embodiment uses the physical constraint of the second accommodating groove 102 to enable the first limiting rod 502 to telescopically move along the second accommodating groove 102, ensuring the stability and predictability of the movement path, so that the first limiting rod 502 can accurately press the end of the top door assembly 30 away from the power device 20 against the groove wall of the first accommodating groove 101.

[0091] In some embodiments, to ensure that the second limiting device 60 can stably fix the power device 20, as shown in FIG. Figure 1 As shown, the second limiting device 60 includes a second driving structure 601 and a second limiting rod 602;

[0092] The output end of the second driving structure 601 is connected to a second limiting rod 602;

[0093] The second driving structure 601 drives the second limiting rod 602 to move in a direction perpendicular to the displacement direction of the top door assembly 30 until the power device 20 is fixed.

[0094] It should be noted that the second driving structure 601 proposed in this embodiment is preferably a motor, and the second driving structure 601 is electrically connected to the main control unit.

[0095] In this way, when the power device 20 needs to be fixed, the main control unit will start the second driving structure 601, so that the second driving structure 601 drives the second limiting rod 602 to extend, that is, move toward the power device 20, until the second limiting rod 602 presses the power device 20 against the wall of the first accommodating groove 101 to prevent the power device 20 from loosening and affecting the normal operation of the entire automatic door opening device.

[0096] When the power device 20 needs to be released, the main control unit will drive the second limiting rod 602 to retract (equivalent to recovery, the same applies to the whole text) through the second driving structure 601 until it is reset.

[0097] In a further embodiment, Figure 1 As shown, the shell 10 is matched with a third accommodating groove 103 corresponding to the second limiting device 60, the second limiting device 60 is placed in the third accommodating groove 103, and the second limiting device 60 performs telescopic movement in the third accommodating groove 103, and the third accommodating groove 103 is communicated with the first accommodating groove 101.

[0098] It is understandable that if the first receiving groove 101 extends along the X-axis direction, then the third receiving groove 103 extends along the Y-axis direction. Of course, it can also extend in other directions, which is not limited here.

[0099] In this way, this embodiment uses the physical constraint of the third accommodating groove 103 to enable the second limiting rod 602 to telescopically move along the third accommodating groove 103, ensuring the stability and predictability of the movement path, so that the second limiting rod 602 can accurately press the outer shell of the power device 20 against the groove wall of the first accommodating groove 101.

[0100] In some embodiments, in order to reduce the space occupied by the automatic door opening device, as Figure 5 As shown, the first limiting device 50 and the second limiting device 60 are located on the same side of the power device 20 .

[0101] Of course, the first limiting device 50 and the second limiting device 60 can also be located on different sides of the power device 20, which is not limited here.

[0102] The elastic component 40 is any one of a tension spring, a torsion spring or a rubber spring.

[0103] It should be noted that the elastic component 40 proposed in this embodiment is illustrated as a tension spring, which can simplify the structure of the automatic door opening device, reduce the space occupied by the automatic door opening device, and reduce production costs.

[0104] In some embodiments, as Figure 6-Figure 7 As shown, the present invention also provides a refrigerator, which includes the automatic door opening device described above.

[0105] It should be noted that the refrigerator proposed in this embodiment includes a refrigerator door 80 and a refrigerator body 90, and the refrigerator door 80 can be opened and closed relative to the refrigerator body 90, and at least one automatic door opening device is matched and installed in the refrigerator body 90.

[0106] In this way, when the refrigerator door 80 is closed relative to the refrigerator body 90 (that is, the refrigerator is in the closed state), the automatic door opening device is in the initial state, at this time the elastic component 40 is in the natural state, the power device 20 pushes the top door component 30 completely out, so that the end of the top door component 30 away from the power device 20 contacts the corresponding refrigerator door 80, but there is no force interaction; the first limit device 50 and the second limit device 60 are both in the retracted state, that is, the first limit device 50 and the second limit device 60 have not extended the corresponding limit rod.

[0107] When the refrigerator wants to open the refrigerator door 80 (that is, the main control unit receives the door opening signal), the automatic door opening device will be in the door opening preparation state. At this time, the main control unit controls the first driving structure 501 to drive the first limiting rod 502 to extend until the first limiting rod 502 presses the end of the top door assembly 30 away from the power device 20 against the groove wall of the first accommodating groove 101, so that the end of the top door assembly 30 away from the power device 20 is fixed and cannot move; then the main control unit starts the power device 20 to enter the recovery state, so that under the interaction of forces, the power device 20 The device 20 will move toward the top door assembly 30 for recovery until the top door assembly 30 is completely recovered and the elastic assembly 40 is in a stretched state. The main control unit then drives the second limiting rod 602 to extend through the second driving structure 601 until the second limiting rod 602 presses the power device 20 against the wall of the first receiving groove 101, thereby fixing the power device 20 and preventing it from moving. The main control unit then controls the first limiting rod 502 to retract through the first driving structure 501, thereby releasing the top door assembly 30 from the end away from the power device 20. When the main control unit receives the signal that the second limiting device 60 has completed opening and the signal that the first limiting device 50 has completed recovery, it controls the power device 20 to push the top door assembly 30 outward, thereby causing the top door assembly 30 to open the refrigerator door 80, thereby completing the purpose of automatically opening the refrigerator door 80.

[0108] like Figure 8As shown, during the opening process of the refrigerator door 80, there are the following situations:

[0109] First, when the refrigerator door 80 is open, if the user suddenly wants to close the refrigerator door 80, that is, when the angular velocity detection device 70 detects that ω is less than the first preset angular velocity ω3, the door closing command is immediately triggered. At this time, the main control unit drives the second limit rod 602 to retract through the second driving structure 601 to release the fixation of the power device 20. At this time, the elastic component 40 will drive the power device 20 to quickly return to the initial state due to its own elastic deformation. Of course, the top door component 30 will also quickly return to the shell 10 with the power device 20, so that the top door component 30 will not hinder the closing process of the refrigerator door 80. The user can close the door directly by hand without waiting for the motor to stop for a long time, so that the door can respond quickly and close immediately during the opening process, thereby improving the user experience.

[0110] Of course, when the top door assembly 30 quickly retreats into the shell 10 following the power device 20, because the power device 20 has not completely pushed out the top door assembly 30, the main control unit will still control the power device 20 to push the top door assembly 30 outward until it is completely pushed out (such as the initial state); then wait for the next door opening command from the main control unit.

[0111] Secondly, when the refrigerator door 80 is being opened, the power device 20 has not completely pushed out the top door assembly 30, and the user has already opened the door, that is, the angular velocity detection device 70 detects that ω>the second preset angular velocity ω2 (ω2>ω1). At this time, the main control unit will immediately turn off the power device 20 to stop the top door assembly 30 from being pushed out, and then drive the second limit rod 602 to retract through the second driving structure 601 to release the fixation of the power device 20. At this time, the elastic component 40 will drive the power device 20 and the top door assembly 30 to retreat quickly due to its own elastic deformation. After the retreat is completed, the power device 20 continues to push the top door assembly 30 outward until it is completely pushed out, thereby restoring the automatic door opening device to its initial state and waiting for the next door opening command from the main control unit.

[0112] Third, after the refrigerator door 80 is fully opened, the top door assembly 30 remains extended and stationary, and the refrigerator door 80 is also stationary. If the angular velocity detection device 70 detects that ω>0, the main control unit will determine that the user has opened the refrigerator door 80, and will control the second driving structure 601 to drive the second limit rod 602 to retract to release the fixation of the power device 20. At this time, the elastic component 40 will drive the power device 20 and the top door assembly 30 to quickly return to the initial state due to its own elastic deformation. Of course, at this time, because the refrigerator door 80 has not been closed, the end of the top door assembly 30 away from the power device 20 has not yet contacted the refrigerator door 80; then wait for the next door opening command issued by the main control unit.

[0113] Obviously, the embodiments described above are only some embodiments of the present invention, rather than all embodiments. The preferred embodiments of the present invention are given in the accompanying drawings, but they do not limit the patent scope of the present invention. The present invention can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive. Although the present invention has been described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions described in the aforementioned specific embodiments, or to make equivalent replacements for some of the technical features therein. Any equivalent structure made using the contents of the present invention specification and drawings, directly or indirectly used in other related technical fields, is also within the scope of patent protection of the present invention.

Claims

1. An automatic door opening device, comprising a housing (10), characterized in that: The housing (10) is provided with: A power device (20) having an output end connected to a top door assembly (30); the power device (20) is used to drive the top door assembly (30) to move axially to open the door; An elastic component (40) is provided between one end of the power device (20) away from the top door component (30) and the corresponding housing (10), and is used to reset the power device (20); a first limiting device (50) for fixing one end of the top door assembly (30) away from the power device (20); A second limiting device (60) is used to fix the power device (20).

2. The automatic door opening device according to claim 1, characterized in that: The automatic door opening device further comprises an angular velocity detection device (70) mounted on the door hinge shaft, wherein the angular velocity detection device (70) is used to detect the angular velocity of the door and obtain the opening and closing state and direction of the door.

3. The automatic door opening device according to claim 1, characterized in that: A first accommodating groove (101) is axially provided in the housing (10), and a power device (20), a top door assembly (30) and an elastic assembly (40) are matched and placed in the first accommodating groove (101), and the power device (20) and the top door assembly (30) are movable in the first accommodating groove (101).

4. The automatic door opening device according to claim 1, characterized in that: The first limiting device (50) comprises a first driving structure (501) and a first limiting rod (502); The output end of the first driving structure (501) is connected to a first limiting rod (502); The first driving structure (501) drives the first limiting rod (502) to move in a direction perpendicular to the displacement direction of the top door assembly (30) until fixing one end of the top door assembly (30) away from the power device (20).

5. The automatic door opening device according to claim 3, characterized in that: The housing (10) is provided with a second accommodating groove (102) corresponding to the first limiting device (50), the first limiting device (50) is placed in the second accommodating groove (102), and the first limiting device (50) performs telescopic movement in the second accommodating groove (102), and the second accommodating groove (102) is communicated with the first accommodating groove (101).

6. The automatic door opening device according to claim 1 or 4, characterized in that: The second limiting device (60) comprises a second driving structure (601) and a second limiting rod (602); The output end of the second driving structure (601) is connected to a second limiting rod (602); The second driving structure (601) drives the second limiting rod (602) to move in a direction perpendicular to the displacement direction of the top door assembly (30) until the power device (20) is fixed.

7. The automatic door opening device according to claim 3, characterized in that: The housing (10) is provided with a third accommodating groove (103) corresponding to the second limiting device (60), the second limiting device (60) is placed in the third accommodating groove (103), and the second limiting device (60) performs telescopic movement in the third accommodating groove (103), and the third accommodating groove (103) is communicated with the first accommodating groove (101).

8. The automatic door opening device according to claim 1, characterized in that: The first limiting device (50) and the second limiting device (60) are located on the same side of the power device (20).

9. The automatic door opening device according to claim 1, characterized in that: The elastic component (40) is any one of a tension spring, a torsion spring or a rubber spring.

10. A refrigerator, characterized in that: The refrigerator comprises the automatic door opening device according to any one of claims 1 to 9.

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