Automatic door opening and closing mechanism and refrigerator

Abstract

The present invention discloses an automatic door opening and closing mechanism and a refrigerator, wherein the automatic door opening and closing mechanism includes: a power assembly for providing driving force; a driving wheel, which is drivingly connected to the power assembly and provided with a first meshing tooth; a driven wheel, which is relatively movably arranged with the driving wheel and provided with a second meshing tooth matching the first meshing tooth; and an electromagnetic clutch assembly, which is mounted on the driving wheel and the driven wheel and is used to drive the driving wheel to engage or disengage with the driven wheel. The automatic door opening and closing mechanism and refrigerator provided by the present invention effectively solve the problem of the prior art refrigerator that the free opening and closing of the refrigerator door is blocked by the automatic door opening and closing mechanism in scenarios such as power outages, drive unit failures, etc., when the automatic door opening and closing mechanism is not needed or cannot be used.

Description

Technical Field

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

[0002] As electromechanical control and intelligent technologies continue to expand into the home appliance sector, consumers are increasingly demanding ease of use, intelligence, and aesthetics in their home appliance experiences. Automatic refrigerator door opening and closing, a fundamental function of intelligent refrigerators, is also becoming increasingly widespread.

[0003] Currently, there are various ways to achieve automatic opening and closing of refrigerator doors. The door in a closed state will be affected by multiple closing forces such as the suction force of the door seal magnetic strip, the elastic force of the door closer, the clamping force of the flip beam, and the negative pressure generated by the low temperature inside the box. This makes the refrigerator door need to resist a large comprehensive resistance in the initial stage of opening. Therefore, most automatic door opening and closing solutions are equipped with an ejection device, which uses an independent ejection mechanism to first open the refrigerator door at a small angle. At this time, the multiple closing forces such as the suction force of the door seal magnetic strip, the elastic force of the door closer, the clamping force of the flip beam, and the negative pressure generated by the low temperature inside the box disappear or weaken as the refrigerator door is opened. The subsequent door opening action depends on another mechanism that assists the rotation of the door body.

[0004] For example, in the prior art, the technical solution described in patent No. 201810749773 does not take into account that when the electromagnetic relay is powered off, the user opening and closing the door will drive the gear set to move, increasing the user's door opening resistance and gear wear;

[0005] In summary, in the prior art refrigerator, when the automatic door opening and closing mechanism is not needed or cannot be used due to power outage, drive unit failure, etc., the free opening and closing of the refrigerator door will be hindered by the automatic door opening and closing mechanism. Summary of the Invention

[0006] An embodiment of the present invention provides an automatic door opening and closing mechanism and a refrigerator to solve the problem in the prior art that the free opening and closing of the refrigerator door will be hindered by the automatic door opening and closing mechanism in scenarios such as power outages, drive unit failures, etc. where the automatic door opening and closing mechanism is not needed or cannot be used.

[0007] To achieve the above-mentioned objectives, the present invention provides an automatic door opening and closing mechanism, comprising: a power assembly for providing driving force; a driving wheel, the driving wheel being drivingly connected to the power assembly, and the driving wheel being provided with a first meshing tooth; a driven wheel, the driven wheel being movably arranged relative to the driving wheel, and the driven wheel being provided with a second meshing tooth matching the first meshing tooth; and an electromagnetic clutch assembly, the electromagnetic clutch assembly being installed on the driving wheel and the driven wheel, and the electromagnetic clutch assembly being used to drive the driving wheel to engage or disengage with the driven wheel.

[0008] Furthermore, the electromagnetic clutch assembly includes an armature and an electromagnetic coil, and the armature and the electromagnetic coil are respectively arranged on the driving wheel and the driven wheel.

[0009] Furthermore, the electromagnetic clutch assembly further includes a clutch spring, which is respectively connected to the driving wheel and the driven wheel, and applies a force to separate the driving wheel and the driven wheel.

[0010] Furthermore, it also includes:

[0011] a fixed spring seat, on which the driven wheel is rotatably disposed;

[0012] A torque spring, one end of the torque spring is connected to the driven wheel, and the other end is connected to the fixed spring seat.

[0013] Furthermore, a receiving groove is provided on the fixed spring seat; the driven wheel has a matching protrusion component, which is rotatably arranged in the receiving groove; the matching protrusion component and the receiving groove form an accommodating space, and the torque spring is arranged in the accommodating space.

[0014] Furthermore, a contact protrusion is provided on the driven wheel, and the contact protrusion rotates with the driven wheel;

[0015] A protection switch is provided on the fixed spring seat and is arranged on the moving path of the touching protruding component. The touching protruding component can trigger the protection switch during the movement.

[0016] Furthermore, a spring baffle that cooperates with the torque spring is provided on the mating protrusion component, and the spring baffle is located inside the accommodating groove;

[0017] The touch protrusion component is located outside the accommodating groove, and the touch protrusion component is connected to the spring baffle and is formed in one piece.

[0018] Furthermore, it also includes: an angular velocity sensor installed on a predetermined structure; a magnetic ring installed on a fixed spring seat and matched with the angular velocity sensor.

[0019] Furthermore, it also includes a hinge, the hinge has a fixed shaft; the fixed spring seat is fixedly connected to the fixed shaft; the driving wheel and the driven wheel are both installed on the fixed shaft.

[0020] Furthermore, the driving wheel is movably arranged along the axis direction of the fixed shaft; the driven wheel is relatively fixedly arranged along the axis direction of the fixed shaft; the driving wheel approaches or moves away from the driven wheel along the axis direction of the fixed shaft.

[0021] Furthermore, the fixed shaft includes a first shaft segment and a second shaft segment connected to each other, and the diameter of the first shaft segment is larger than that of the second shaft segment; the driving wheel is arranged on the first shaft segment, and the driven wheel is arranged on the second shaft segment; a limiting step is formed at the connection between the first shaft segment and the second shaft segment, and one end of the driven wheel abuts against the limiting step and the other end abuts against the fixed spring seat.

[0022] Furthermore, the power assembly includes a motor, a reducer and an output gear, the output gear is drivingly connected to the output shaft of the motor through the reducer; the driving wheel is provided with a gear portion, and the output gear is meshed with the gear portion.

[0023] According to another aspect of the present invention, a refrigerator is provided, comprising the above-mentioned automatic door opening and closing mechanism.

[0024] Furthermore, the refrigerator includes a door and a body, and the automatic door opening and closing mechanism is installed in the door.

[0025] Furthermore, the automatic door opening and closing mechanism includes: a hinge, the hinge having a fixed axis; the hinge is fixed on the box body, the fixed axis is at least partially located in the box door, and the box door rotates around the fixed axis as the rotating axis; a fixed spring seat, the fixed spring seat is fixedly connected to the fixed axis; the driven wheel is rotatably arranged on the fixed spring seat; and a torque spring, one end of the torque spring is connected to the driven wheel and the other end is connected to the fixed spring seat.

[0026] When the automatic door opening and closing mechanism of the present invention can be applied to a refrigerator, the driving wheel and the driven wheel in the automatic door opening and closing mechanism are in a separated state for a long time (normal operating state, when the door does not need to be opened or closed). After the automatic door opening and closing mechanism receives the automatic door opening and closing command, the electromagnetic clutch assembly is energized to perform work, and the originally separated driving wheel and driven wheel are meshed together under the action of the electromagnetic clutch assembly. The driving force of the power assembly is transmitted to the driving wheel, which drives the driven wheel, and the driven wheel drives the refrigerator door to open or close. In scenarios such as power outages, drive unit failures, etc. where the automatic door opening and closing mechanism is not needed or cannot be used, the electromagnetic clutch assembly also loses its function, causing the driving wheel and the driven wheel to be in a separated state. In this way, the driving wheel and the driven wheel, which play a major role in the automatic door opening and closing mechanism, will no longer mesh and form resistance, and the door can be opened and closed freely without being blocked by the automatic door opening and closing mechanism. This not only enables the refrigerator to realize the high-end function of automatic door opening and closing, but also improves user experience and increases user satisfaction in the event of power outages or failures. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 2 is a schematic structural diagram of an automatic door opening and closing structure according to an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the exploded structure of the automatic opening and closing door structure according to an embodiment of the present invention;

[0029] Figure 3 This is a schematic diagram of the internal coordination of the automatic opening and closing door structure according to an embodiment of the present invention;

[0030] Figure 4 Schematic diagram of the internal coordination of a refrigerator according to an embodiment of the present invention. DETAILED DESCRIPTION

[0031] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0032] See also Figure 1 and Figure 2 As shown, according to an embodiment of the present invention, an automatic door opening and closing mechanism is provided, which includes a power assembly 10, a driving wheel 21, a driven wheel 22 and an electromagnetic clutch assembly. The power assembly 10 is used to provide driving force; the driving wheel 21 is drivingly connected to the power assembly 10, and a first meshing tooth 211 is provided on the driving wheel 21; the driven wheel 22 is relatively movably arranged with the driving wheel 21, and a second meshing tooth 221 matching the first meshing tooth 211 is provided on the driven wheel 22; the electromagnetic clutch assembly is installed on the driving wheel 21 and the driven wheel 22, and the electromagnetic clutch assembly is used to drive the driving wheel 21 to engage or disengage with the driven wheel 22.

[0033] When the automatic door opening and closing mechanism of the present invention can be applied to a refrigerator, the driving wheel 21 and the driven wheel 22 in the automatic door opening and closing mechanism are in a separated state for a long time (normal operating state, when the door does not need to be opened or closed). After the automatic door opening and closing mechanism receives the automatic door opening and closing command, the electromagnetic clutch assembly is energized to perform work, and the originally separated driving wheel 21 and the driven wheel 22 are meshed together under the action of the electromagnetic clutch assembly. The driving force of the power assembly 10 is transmitted to the driving wheel 21, which drives the driven wheel 22, and the driven wheel 22 drives the refrigerator door to open or close. In the case of a power outage, a drive unit failure, or other scenarios where the automatic door opening and closing mechanism is not needed or cannot be used, the electromagnetic clutch assembly also loses its function, causing the driving wheel 21 and the driven wheel 22 to be in a separated state. In this way, the driving wheel and the driven wheel, which play a major role in the automatic door opening and closing mechanism, will no longer mesh and form resistance, and the door can be opened and closed freely without being blocked by the automatic door opening and closing mechanism. This not only enables the refrigerator to realize the high-end function of automatic door opening and closing, but also improves the user experience and increases user satisfaction in the event of a power outage or failure.

[0034] The electromagnetic clutch assembly in the automatic door opening and closing mechanism is normally open in a normal state, separating the driving wheel 21 and the driven wheel 22. When the electromagnetic clutch assembly is energized, the driving wheel 21 and the driven wheel 22 are brought close together and engaged.

[0035] The electromagnetic clutch assembly includes an armature 31 and an electromagnetic coil 32, which are respectively arranged on the driving wheel 21 and the driven wheel 22. In this embodiment, the armature 31 is mounted on the driving wheel 21, and the electromagnetic coil 32 is mounted on the driven wheel 22. After receiving the automatic door opening and closing command, the electromagnetic coil 32 is energized, and the armature 31 approaches the electromagnetic coil 32 under the action of the magnetic force. The driving wheel 21 also approaches the driven wheel 22 under the action of the armature 31, and the first meshing teeth 211 and the second meshing teeth 221 gradually engage and form a meshing fit. If the electromagnetic coil 32 is powered off (the refrigerator is powered off or the power is automatically turned off), the armature 31 will not be attracted by the magnetic force, and the driving wheel 21 will remain separated from the driven wheel 22. Of course, the armature 31 can also be mounted on the driven wheel 22, and the electromagnetic coil 32 can be mounted on the driving wheel 21. These are all structural methods that can achieve the same function.

[0036] Preferably, the electromagnetic clutch assembly further includes a clutch spring 33, which is connected to the driving wheel 21 and the driven wheel 22, respectively. The clutch spring 33 applies a force that separates the driving wheel 21 and the driven wheel 22. After the driving wheel 21 and the driven wheel 22 are engaged, they need to return to a normal separated state. In this case, when the electromagnetic coil 32 is de-energized (the refrigerator is automatically powered off), the armature 31 is no longer attracted by the magnetic force, and the force exerted by the clutch spring 33 separates the driving wheel 21 and the driven wheel 22. When the refrigerator loses power or the automatic door opening and closing mechanism malfunctions and is automatically powered off, the electromagnetic coil 32 no longer generates a magnetic force, and the clutch spring 33 maintains the separation of the driving wheel 21 and the driven wheel 22. When the automatic door opening and closing function is enabled, the electromagnetic coil 32 is energized, attracting the armature 31. The armature 311 drives the driving wheel 21 to overcome the elastic force of the clutch spring 33 and engage with the driven wheel 22.

[0037] See also Figure 1 and Figure 2 The driving wheel 21 is arranged above the driven wheel 22, with the first meshing teeth 211 located on the lower end surface of the driving wheel and the second meshing teeth 221 located on the upper end surface of the driven wheel. Both the driving wheel and the driven wheel are provided with cavities, with an armature 31 fixed in the cavity of the driving wheel and an electromagnetic coil 32 fixed in the cavity of the driven wheel. Both the driving wheel 21 and the driven wheel 22 are cylindrical structures, with a clutch spring 33 sleeved on the outer circumference of the driving wheel and the driven wheel. Flange structures are provided on the outer circumference of the driving wheel and the driven wheel, and the clutch springs respectively abut against the two flange structures. The clutch spring functions to keep the first meshing teeth and the second meshing teeth in a normally open state through elastic force, preventing meshing.

[0038] The automatic door opening and closing mechanism also includes a fixed spring seat 41 and a torque spring 42. The driven wheel 22 is rotatably mounted on the fixed spring seat 41. One end of the torque spring 42 is connected to the driven wheel 22, and the other end is connected to the fixed spring seat 41. As the driven wheel 22 rotates, it continuously compresses the torque spring 42. The stored elastic force of the compressed torque spring 42 provides a reaction force, driving the door in the opposite direction along the power transmission chain.

[0039] Combine Figure 2 and Figure 3 As shown, in this embodiment, a further preferred embodiment comprises a receiving groove 411 provided on the fixed spring seat 41; the driven wheel 22 has a mating protrusion 222 rotatably disposed within the receiving groove 411; the mating protrusion 222 and the receiving groove 411 form a receiving space within which the torque spring 42 is disposed. This means that the driven wheel 22 and the fixed spring seat 41 form a mounting fit, with the torque spring 42 contained within the receiving space. This saves structural space and facilitates structural miniaturization. Furthermore, the receiving space provides a certain limit for the torque spring 42, constraining its deformation path and preventing deformation and failure during long-term use. In this embodiment, a baffle is provided on the receiving groove to support the torque spring, thereby dividing the receiving groove into two, forming two receiving spaces, each containing two torque springs. This arrangement increases the upper limit of the stored elastic force, enabling the push of heavier doors and overcoming greater resistance to movement.

[0040] Preferably, the driven wheel 22 is provided with a touch protrusion 223, which rotates with the driven wheel 22; the fixed spring seat 41 is provided with a protection switch 43, which is arranged on the moving path of the touch protrusion 223, and the touch protrusion 223 can trigger the protection switch 43 during the movement. The protection switch 43 is set to the position corresponding to the maximum deformation of the torque spring 42, so as to prevent the driven wheel 22 from rotating too much and damaging the torque spring during the continuous output of the power component 10. In addition, the protection switch 43 is also a component for determining whether the resistance of the door is abnormal during opening or closing. After the protection switch 43 triggers the signal, it will determine that the resistance of the door movement is abnormal. After receiving the signal, the control system will control the electromagnetic coil to cut off the power.

[0041] The actual application scenarios for abnormal door movement resistance include, but are not limited to, encountering obstacles during the door opening and closing process, and the sudden intervention of the user in manually opening and closing the door. The abnormal resistance threshold is calibrated through experiments, and its effect is reflected in the mechanical design of the torque spring.

[0042] To further simplify the structure and achieve multifunctionality, the mating protrusion 222 in this embodiment is provided with a spring retainer 224 that engages with the torque spring 42. The spring retainer 224 is located within the receiving slot 411. The contacting protrusion 223 is located outside the receiving slot 411 and is integrally connected to the spring retainer 224. To provide support for the torque spring 42, the spring retainer 224 extends into the receiving slot 411 to form the contacting protrusion 223. The contacting protrusion 223 is designed to mate with the protection switch 43. This integrally formed component facilitates manufacturing and reduces costs.

[0043] The automatic door opening and closing mechanism also includes an angular velocity sensor 51 and a magnetic ring 52. The angular velocity sensor 51 is mounted on a predetermined structure. The magnetic ring 52 is mounted on the fixed spring seat 41 and is configured to match the angular velocity sensor 51. The control system uses the angular velocity sensor 51 and the magnetic ring 52 to detect the rotation of the driven wheel and the door.

[0044] The automatic door opening and closing mechanism also includes a hinge 60 with a fixed shaft 61. A fixed spring seat 41 is fixedly connected to the fixed shaft 61. The fixed spring seat 41 is provided with a limit stop that is embedded within the fixed shaft 61 to circumferentially stabilize the fixed spring seat. Both the driving wheel 21 and the driven wheel 22 are mounted on the fixed shaft 61. Hinge 60 serves as the door's fixed and rotating mechanism. The upper and lower ends of the refrigerator door are connected to the hinge's fixed shaft, and the door's rotating axis is coaxial with the fixed shaft. The fixed end of the hinge is screwed to the refrigerator body.

[0045] Combine Figures 1 to 3 As shown, in this embodiment, the driving wheel 21 of the automatic door opening and closing mechanism is movably arranged along the axis of the fixed shaft 61; the driven wheel 22 is relatively fixedly arranged along the axis of the fixed shaft 61; the driving wheel 21 approaches or moves away from the driven wheel 22 along the axis of the fixed shaft 61. By using the fixed shaft 61 as the basic support structure for the driving and driven wheels, the structural complexity is effectively reduced. The fixed shaft 61 serves as both the rotating axis of the door and the foundation of the automatic door opening mechanism, realizing the automatic door opening and closing function. Furthermore, the principle of the torque spring reaction force cooperates with the fixed shaft 61 in principle to realize the automatic door opening and closing function.

[0046] The fixed shaft 61 includes a first shaft section 61a and a second shaft section 61b, with the first shaft section 61a having a larger diameter than the second shaft section 61b. The driving wheel 21 is mounted on the first shaft section 61a, and the driven wheel 22 is mounted on the second shaft section 61b. A stop step 61c is formed at the junction of the first and second shaft sections 61a and 61b. One end of the driven wheel 22 abuts the stop step 61c, while the other end abuts the fixed spring seat 41. In other words, the driving wheel can move up and down on the first shaft section, engaging and disengaging via the electromagnetic clutch assembly. The driven wheel 22, on the other hand, remains stationary along the axis of the fixed shaft 61, rotating only in a rotational direction. This arrangement provides a more stable transmission chain and effectively transmits a greater torque. Furthermore, since the central portion of the driven wheel 22 is a hollow structure with an electromagnetic coil installed in the cavity, the driven wheel 22 in this embodiment is limited and abutted by the fixed electromagnetic coil against the stop step 61c.

[0047] The power assembly 10 includes a motor 11, a reducer 12 and an output gear 13. The output gear 13 is connected to the output shaft of the motor 11 through the reducer 12. The driving wheel 21 is provided with a gear portion 212, and the output gear 13 meshes with the gear portion 212. Since the tooth ends of the meshing teeth corresponding to the driving wheel 21 and the driven wheel 22 are flat, there is a situation where the tooth tops cannot mesh with the tooth tops when the two wheels are axially meshed. Therefore, when the system controls the electromagnetic clutch assembly to execute the meshing instruction, it also needs to control the power assembly to execute the rotation command at the same time to drive the driving wheel to rotate so that the tooth tops of the first meshing teeth are offset from the tooth tops of the second meshing teeth, so that the two can mesh smoothly and transmit power. It can be done by Figure 1 As can be seen from the figure, the gear portion 212 of the driving wheel 21 is a complete gear plate, which extends from the side of the gear plate into an annular structure. The annular structure has an annular first meshing tooth. The rotation axis of the first meshing tooth is collinear with the rotation axis of the gear plate, and the rotation directions of the two are the same, which makes the transmission more direct and the structure can be simplified.

[0048] The operation process and principle of the automatic door opening and closing mechanism of the present invention are as follows:

[0049] The control system receives the automatic door opening and closing command and energizes the electromagnetic coil 32. The armature 31 moves closer to the electromagnetic coil 32 under the action of the magnetic force. At the same time, the driving wheel 21 moves closer to the driven wheel 22 under the action of the armature 31. The first meshing teeth 211 and the second meshing teeth 221 gradually mesh and form a meshing fit. As the driven wheel 22 rotates, the driven wheel 22 continuously compresses the torque spring in the fixed spring seat. At this time, the following two situations occur:

[0050] (1) When the stored force of the torque spring is greater than the resistance to door movement and the protruding part does not touch the protective switch, the reaction force provided by the torque spring can drive the door in the opposite direction along the transmission chain. During the door rotation, the control system detects the door rotation amount through the angular velocity sensor and magnetic ring, and then controls the door to stop movement at the appropriate time.

[0051] (2) When the protruding part touches the protection switch and the elastic force stored in the torque spring is still less than the rotational resistance of the door, the door cannot rotate at this time. The control system receives the trigger signal of the protection switch, that is, it determines that the movement resistance of the door is abnormal. The control system can immediately terminate the driver program and cut off the power to the electromagnetic coil to disengage the driving wheel and the driven wheel, thereby disconnecting the movement connection between the door and the power component.

[0052] Furthermore, when the system is in standby mode, experiencing a drive anomaly, experiencing a power outage, or when the automatic door opening and closing function is disabled, the electromagnetic coil is de-energized, the driving and driven wheels disengage, and the door is disconnected from the power assembly. During this time, the door's rotation does not move the power assembly, driving wheel, or other components, significantly reducing resistance and power assembly losses, thereby extending the life of the door.

[0053] The present invention also provides a refrigerator, see Figure 4 , the refrigerator includes the automatic door opening and closing mechanism of the above embodiment.

[0054] The refrigerator includes a door 71 and a body 72, and the automatic door opening and closing mechanism is installed in the door 71. Since it is placed in the door, a hidden installation design is realized, and the appearance is no different from that of an ordinary refrigerator, without the need for additional ejection mechanisms and other complex appearance parts that affect the appearance.

[0055] Preferably, the automatic door opening and closing mechanism includes a hinge 60, a fixed spring seat 41, and a torque spring 42. The hinge 60 has a fixed shaft 61; the hinge 60 is fixed to the housing 72. The fixed shaft 61 is at least partially located within the door 71, and the door 71 rotates about the fixed shaft 61. The fixed spring seat 41 is fixedly connected to the fixed shaft 61; the driven wheel 22 is rotatably mounted on the fixed spring seat 41. One end of the torque spring 42 is connected to the driven wheel 22, and the other end is connected to the fixed spring seat 41.

[0056] The refrigerator of the present invention can sense the user's need to open the door through a control system. The automatic door opening and closing mechanism fully automates the door opening and closing process, completely freeing the user's hands and providing a good user experience. The modularity of the automatic door opening and closing mechanism offers advantages such as wide application and strong compatibility, making it adaptable to most new and existing models. This modular automatic door opening and closing mechanism overcomes the limited application scenarios of traditional automatic door opening and closing mechanisms, providing flexible response to various operating conditions. Furthermore, the module includes comprehensive mechanism protection devices to extend the mechanism's service life.

[0057] When the user needs to limit or completely prohibit the system's intelligence level due to subjective reasons or objective reasons such as abnormal system operation, the system has necessary configurable items to allow the user to adjust its automation level.

[0058] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, tasks, devices, components and / or combinations thereof.

[0059] Of course, the above are preferred embodiments of the present invention. It should be noted that those skilled in the art can make several improvements and modifications without departing from the basic principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. An automatic door opening and closing mechanism, characterized in that: include: A power assembly (10) for providing driving force; A driving wheel (21), the driving wheel (21) is drivingly connected to the power assembly (10), and the driving wheel (21) is provided with a first meshing tooth (211); A driven wheel (22), the driven wheel (22) and the driving wheel (21) being movably arranged relative to each other, and the driven wheel (22) being provided with second meshing teeth (221) matching the first meshing teeth (211); an electromagnetic clutch assembly, the electromagnetic clutch assembly being mounted on the driving wheel (21) and the driven wheel (22), the electromagnetic clutch assembly being used to drive the driving wheel (21) to engage with or disengage from the driven wheel (22); a fixed spring seat (41), the driven wheel (22) being rotatably disposed on the fixed spring seat (41); a torque spring (42), one end of the torque spring (42) being connected to the driven wheel (22) and the other end being connected to the fixed spring seat (41); a receiving groove (411) being provided on the fixed spring seat (41); the driven wheel (22) having a matching protrusion (222), the matching protrusion (222) being rotatably disposed in the receiving groove (411); a receiving space being formed between the matching protrusion (222) and the receiving groove (411), and the torque spring (42) being disposed in the receiving space; The driven wheel (22) is provided with a touch protrusion component (223), and the touch protrusion component (223) rotates with the driven wheel (22); the fixed spring seat (41) is provided with a protection switch (43), and the protection switch (43) is arranged on the moving path of the touch protrusion component (223), and the touch protrusion component (223) can trigger the protection switch (43) during the movement.

2. The automatic door opening and closing mechanism according to claim 1, characterized in that: The electromagnetic clutch assembly comprises an armature (31) and an electromagnetic coil (32), wherein the armature (31) and the electromagnetic coil (32) are respectively arranged on the driving wheel (21) and the driven wheel (22).

3. The automatic door opening and closing mechanism according to claim 2, characterized in that: The electromagnetic clutch assembly further comprises a clutch spring (33), wherein the clutch spring (33) is respectively connected to the driving wheel (21) and the driven wheel (22), and the clutch spring (33) applies a force to separate the driving wheel (21) and the driven wheel (22).

4. The automatic door opening and closing mechanism according to claim 1, characterized in that: The mating protrusion component (222) is provided with a spring baffle (224) mating with the torque spring (42), and the spring baffle (224) is located inside the accommodating groove (411); The touching protruding part (223) is located outside the accommodating groove (411), and the touching protruding part (223) is connected to the spring baffle (224) and is integrally formed.

5. The automatic door opening and closing mechanism according to claim 1, characterized in that: Also includes: An angular velocity sensor (51) is mounted on a predetermined structure; A magnetic ring (52) is mounted on the fixed spring seat (41) and is matched with the angular velocity sensor (51).

6. The automatic door opening and closing mechanism according to claim 1, characterized in that: Also included is a hinge (60), wherein the hinge (60) has a fixed axis (61); The fixed spring seat (41) is fixedly connected to the fixed shaft (61); The driving wheel (21) and the driven wheel (22) are both passed through the fixed shaft (61).

7. The automatic door opening and closing mechanism according to claim 6, characterized in that: The driving wheel (21) is movably arranged along the axial direction of the fixed shaft (61); The driven wheel (22) is relatively fixedly arranged along the axial direction of the fixed shaft (61); The driving wheel (21) approaches or moves away from the driven wheel (22) along the axial direction of the fixed shaft (61).

8. The automatic door opening and closing mechanism according to claim 6, characterized in that: The fixed shaft (61) comprises a first shaft section (61a) and a second shaft section (61b) connected to each other, wherein the diameter of the first shaft section (61a) is larger than that of the second shaft section (61b); The driving wheel (21) is arranged on the first shaft section (61a), and the driven wheel (22) is arranged on the second shaft section (61b). A limiting step (61c) is formed at the connection between the first shaft section (61a) and the second shaft section (61b). One end of the driven wheel (22) abuts against the limiting step (61c), and the other end abuts against the fixed spring seat (41).

9. The automatic door opening and closing mechanism according to claim 1, characterized in that: The power assembly (10) includes a motor (11), a reducer (12) and an output gear (13), wherein the output gear (13) is drivingly connected to the output shaft of the motor (11) through the reducer (12); The driving wheel (21) is provided with a gear portion (212), and the output gear (13) is meshed with the gear portion (212).

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

11. The refrigerator according to claim 10, characterized in that The refrigerator comprises a door (71) and a body (72), and the automatic door opening and closing mechanism is installed in the door (71).

12. The refrigerator according to claim 11, characterized in that The automatic door opening and closing mechanism comprises: A hinge (60), wherein the hinge (60) has a fixed shaft (61); the hinge (60) is fixed to the box body (72), the fixed shaft (61) is at least partially located in the box door (71), and the box door (71) rotates with the fixed shaft (61) as a rotation axis; a fixed spring seat (41), the fixed spring seat (41) being fixedly connected to the fixed shaft (61); the driven wheel (22) being rotatably disposed on the fixed spring seat (41); A torque spring (42), one end of the torque spring (42) is connected to the driven wheel (22), and the other end is connected to the fixed spring seat (41).

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