Refrigerator and refrigerator automatic door closing method

Abstract

The application belongs to the technical field of refrigerators, and specifically discloses a refrigerator and a refrigerator automatic door closing method, which comprise a main cabinet body, opposite sides of the main cabinet body are both hingedly connected with door bodies, the inner side of one of the door bodies is pivotally connected with a turnover beam, one of the main cabinet body and the turnover beam is provided with a guide protrusion, the other of the main cabinet body and the turnover beam is provided with a guide groove, the guide protrusion and the guide groove are in sliding fit, and the refrigerator automatic door closing method further comprises a turnover driving mechanism, which comprises a push rod protruding on the turnover beam and a driving unit comprising a driving transmission assembly and a rotating arm, the driving transmission assembly is configured to drive the rotating arm to rotate horizontally to push the push rod, so that the turnover beam is turned over under the guidance of the guide protrusion and the guide groove. The refrigerator automatic door closing method is applied to the refrigerator. The refrigerator and the refrigerator automatic door closing method provided by the application can realize automatic turnover of the turnover beam, realize automatic opening and closing of the double-door refrigerator, and are compatible with manual operation of the refrigerator, thereby improving the use experience of consumers.

Description

[0001] The present application claims priority to the prior application with the application number of 202010074187.5, the application date of January 22, 2020, the title of a refrigerator and a refrigerator automatic door closing method, and the applicant of Nanjing Zhongjingke Electronic Technology Co., Ltd. TECHNICAL FIELD

[0002] The present application relates to the technical field of refrigerator, and in particular to a refrigerator and a refrigerator automatic door closing method. BACKGROUND

[0003] The refrigerator is a common household appliance for food preservation. With the increasing demand for the capacity of the refrigerator, large-capacity refrigerators are increasingly favored by consumers. The existing large-capacity refrigerators are mostly designed with a double-door type, and in order to ensure the sealing performance of the double-door refrigerator when the doors are closed, the inner side of one of the doors is hingedly provided with a turnover beam capable of being turned over relative to the door. When the door is closed, the turnover beam is located between the gap between the two doors, thereby avoiding the problem of leakage of cold air from the gap between the two doors of the double-door refrigerator.

[0004] In order to realize the turnover of the turnover beam during the opening and closing of the refrigerator, the top of the turnover beam is provided with a guide protrusion, and the inner side of the top of the box body is provided with a guide groove. When the door is closed, the guide protrusion enters the guide groove and slides along the groove wall of the guide groove, thereby driving the turnover beam to turn to the closed state. When the door is opened, under the action of external force, the guide protrusion slides along the groove wall of the guide groove to exit the guide groove, thereby driving the turnover beam to turn to the open state.

[0005] For the refrigerator that realizes automatic opening and closing of the door by using the ejection mechanism and the rotating mechanism, during the automatic opening of the refrigerator, the ejection mechanism overcomes the suction force of the door seal and has sufficient pushing force to push the turnover beam on the door to complete the turnover during the opening of the door. However, during the automatic closing of the refrigerator, the door is rotated only by the torque provided by the rotating mechanism, and the driving torque is relatively small compared with the rotating torque generated during the manual closing process, so that the door is difficult to generate sufficient pushing force to push the turnover beam to realize the turnover during the closing process, thereby hindering the automatic closing process and preventing the refrigerator with the turnover beam from realizing the automatic opening and closing action. SUMMARY

[0006] One object of the present application is to provide a refrigerator that realizes the automatic turnover of the turnover beam during the closing of the refrigerator, thereby enabling the refrigerator with the turnover beam to realize the automatic opening and closing action.

[0007] Another object of the present application is to provide a refrigerator automatic door closing method that realizes the automatic turnover of the turnover beam during the closing of the refrigerator and the automatic closing of the refrigerator, thereby improving the user experience.

[0008] To achieve the above object, the present application adopts the following technical solutions:

[0009] A refrigerator comprises a main cabinet, the opposite sides of the main cabinet are hingedly connected with door bodies, the inner side of one of the door bodies is pivotally connected with a turnover beam, one of the main cabinet and the turnover beam is provided with a guide protrusion, the other of the main cabinet and the turnover beam is provided with a guide slot, the guide protrusion and the guide slot are in sliding fit, and the refrigerator further comprises a turnover driving mechanism, the turnover driving mechanism comprises:

[0010] A push rod is protruded on the turnover beam;

[0011] A driving unit comprises a driving transmission assembly and a rotating arm, the driving transmission assembly is configured to drive the rotating arm to rotate horizontally to push the push rod, so that the turnover beam is turned over under the guidance of the guide protrusion and the guide slot.

[0012] As a preferred technical solution of the refrigerator, when the driving unit stops at a preset initial position, the projection of the rotating arm on a horizontal plane is located outside the projection of the guide slot on the horizontal plane.

[0013] As a preferred technical solution of the refrigerator, the rotating arm comprises a shaft connecting portion and an extension arm portion extending radially outward along the shaft connecting portion, the shaft connecting portion is vertically arranged and in transmission connection with the driving transmission assembly, the extension arm portion is uniformly and spacedly arranged with at least two along the circumference of the shaft connecting portion, and when the guide protrusion extends into the guide slot, the push rod is located between the adjacent two extension arm portions.

[0014] As a preferred technical solution of the refrigerator, the driving transmission assembly comprises:

[0015] A driving motor;

[0016] A transmission assembly, the transmission assembly comprises a driving shaft arranged vertically, the output shaft of the driving motor is connected with the driving shaft, and the rotating arm is sleeved on the driving shaft.

[0017] As a preferred technical solution of the refrigerator, a torsional spring is sleeved on the driving shaft, one end of the torsional spring is fixed relative to the rotating arm, and the other end of the torsional spring is fixed relative to the driving shaft.

[0018] As a preferred technical solution of the refrigerator, the transmission assembly further comprises:

[0019] A worm is sleeved on the output shaft of the driving motor;

[0020] A worm wheel is engaged with the worm;

[0021] An input gear is coaxially arranged with the worm wheel;

[0022] an output gear sleeved on the driving shaft;

[0023] an intermediate transmission gear set engaged between the input gear and the output gear.

[0024] As a preferred technical solution of the refrigerator, the output gear is a one-way gear, and the output torque of the one-way gear is in the same direction as the torque required for the turnover beam to turn during the door closing process.

[0025] As a preferred technical solution of the refrigerator, the output gear comprises:

[0026] a gear body having an installation groove formed in one end face, and a sliding groove formed in a groove side wall of the installation groove;

[0027] a ratchet wheel arranged in the installation groove, and a plurality of ratchet teeth uniformly and circumferentially arranged on the ratchet wheel;

[0028] a sliding block abutting against the ratchet teeth at one end and slidably connected with a groove wall of the sliding groove at the other end;

[0029] a spring connected with the sliding block at one end and connected with a groove bottom of the sliding groove away from the ratchet wheel at the other end.

[0030] As a preferred technical solution of the refrigerator, the turnover driving mechanism further comprises:

[0031] a position detection assembly for detecting the position of the rotating arm.

[0032] As a preferred technical solution of the refrigerator, the position detection assembly comprises:

[0033] a photoelectric sensor comprising a circuit board, a receiving portion and a transmitting portion spaced apart and oppositely arranged on the circuit board;

[0034] a light shielding member sleeved on the driving shaft, the light shielding member having a light shielding portion, and the light shielding member being capable of rotating synchronously with the driving shaft to make the light shielding portion intermittently extend into a gap between the receiving portion and the transmitting portion to shield light.

[0035] As a preferred technical solution of the refrigerator, each door body is correspondingly provided with one rotating mechanism configured to drive the corresponding door body to rotate relative to the main cabinet body, and the ejecting mechanism is configured to eject the corresponding door body relative to the main cabinet body by a preset distance.

[0036] A refrigerator automatic door closing method applied to the refrigerator described above and comprising the following steps:

[0037] The rotating mechanism drives the door body to perform door closing rotation.

[0038] When the door body rotates to the preset position, the driving unit of the turnover driving mechanism acts and drives the rotating arm to rotate, and the rotation of the rotating arm drives the turnover beam to overturn;

[0039] When the door body is completely closed, the rotating mechanism stops acting and the driving unit stops to the preset initial position.

[0040] The beneficial effects of the present application are:

[0041] The refrigerator provided by the present application can realize automatic overturning of the turnover beam in the door closing process, ensure smooth automatic opening and closing of the refrigerator, and realize automatic closing of the refrigerator. The contact between the rotating arm and the push rod without connection can make the turnover beam be arranged separately from the driving unit, reduce the structural complexity of the turnover beam, facilitate processing of the turnover beam, and be applicable to most existing double-door refrigerators, thereby reducing the production cost of the refrigerator.

[0042] The refrigerator automatic closing method provided by the present application can realize automatic overturning of the turnover beam in the door closing process of the refrigerator, realize automatic closing of the refrigerator, and improve the use experience of consumers. BRIEF DESCRIPTION OF DRAWINGS

[0043] Figure 1 The structure schematic diagram of the refrigerator provided by the present application is shown in the figure;

[0044] Figure 2 The structure schematic diagram of the refrigerator provided by the present application is shown in the figure;

[0045] Figure 3 The structure schematic diagram of the refrigerator provided by the present application is shown in the figure;

[0046] Figure 4 The structure schematic diagram of the refrigerator provided by the present application is shown in the figure;

[0047] Figure 5 The structure schematic diagram of the refrigerator provided by the present application is shown in the figure;

[0048] Figure 6 The structure schematic diagram of the refrigerator provided by the present application is shown in the figure; Figure 5 The structure schematic diagram of the refrigerator provided by the present application is shown in the figure;

[0049] Figure 7 The structure schematic diagram of the refrigerator provided by the present application is shown in the figure;

[0050] Figure 8 is a split structure schematic view of an output gear provided by an embodiment of the present application;

[0051] Figure 9 is a structure schematic view of a driving shaft and a rotating arm provided by an embodiment of the present application.

[0052] The figures are marked as follows:

[0053] 10 - turnover driving mechanism; 20 - main cabinet body; 30 - door body; 301 - upper door body; 302 - lower door body; 40 - rotating mechanism; 50 - ejection mechanism; 60 - turnover beam; 601 - guide protrusion; 6011 - guide curved surface;

[0054] 1 - lever;

[0055] 2 - fixed seat; 21 - lower seat body; 211 - guide groove; 2111 - guide groove wall; 22 - upper seat body; 221 - through hole;

[0056] 3 - driving unit; 31 - rotating arm; 311 - shaft connecting part; 312 - extension arm part; 32 - driving transmission assembly; 321 - driving motor; 322 - output gear; 3221 - gear body; 32211 - mounting groove; 32212 - sliding groove; 32213 - clamping protrusion; 3222 - ratchet wheel; 32221 - ratchet wheel tooth; 32222 - anti-rotation protrusion; 3223 - sealing plate; 32231 - clamping groove; 3224 - sliding block; 3225 - spring; 323 - driving shaft; 3231 - anti-rotation groove; 33 - protection shell; 331 - upper shell; 332 - lower shell; 34 - torsional spring; 35 - limiting gasket; 36 - limiting check ring; 37 - limiting pin;

[0057] 4 - position detection assembly; 41 - photoelectric sensor; 42 - light shielding piece; 421 - light shielding part. DETAILED DESCRIPTION

[0058] The present application will be further described below in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application. In addition, it should be noted that, for the convenience of description, only the parts related to the present application are shown in the drawings, but not all the structures.

[0059] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0060] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0061] In the description of the present embodiment, the terms "up", "down", "right", and other orientation or position relationships are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0062] Figure 1 The structure schematic diagram of the refrigerator provided by the embodiment of the present application, Figure 2 The partial structure schematic diagram of the refrigerator in the door closing state of the turnover beam 60 provided by the embodiment of the present application, Figure 3 The partial structure schematic diagram of the refrigerator in the door opening state of the turnover beam 60 provided by the embodiment of the present application, as Figures 1-3 As shown in the drawings, the present embodiment provides a double-door refrigerator, which comprises a main cabinet 20, and door bodies 30 are pivotally connected to both sides of the main cabinet 20. The inner side edge of one of the door bodies 30 is pivotally connected to a turnover beam 60. When the refrigerator is in a closed state, the turnover beam 60 is located between the two door bodies 30 to seal the refrigerator. The refrigerator further comprises a door opening and closing device capable of automatically opening and closing the door body 30, which comprises an ejection mechanism 50 capable of ejecting the door body 30, a rotating mechanism 40 capable of driving the door body 30 to rotate, and a turnover driving mechanism 10 capable of driving the turnover beam 60 to overturn.

[0063] In the embodiment, the main cabinet 20 includes a refrigeration chamber and a freezing chamber separated by a partition plate, and the door body 30 includes two upper door bodies 301 arranged in pairs at the refrigeration chamber opening and two lower door bodies 302 arranged in pairs at the freezing chamber opening. The turnover beam 60 is arranged at one of the upper door bodies 301, and the opening and closing door device is arranged at the top of the main cabinet 20 to realize the automatic opening and closing door action of the upper door body 301. In another embodiment, the freezing chamber can also be arranged in a drawer type, and at this time, the door body 30 only includes the upper door body 301 arranged at the refrigeration chamber opening. In another embodiment, the opening and closing door device can be arranged at the top or bottom of the main cabinet 20 to drive the upper door body 301 and the lower door body 302 to rotate, respectively. The structures of the main cabinet 20, the door body 30, and the turnover beam 60 are conventional structures of the refrigerator, which can be arranged by referring to the structures in the prior art, and this is not the focus of the present application. The specific structure of the present application is not limited and described.

[0064] The opening and closing door device includes two sets of ejection mechanisms 50 and two sets of rotating mechanisms 40, which are arranged corresponding to the two upper door bodies 301. The turnover driving mechanism 10 is arranged corresponding to the turnover beam 60 at the middle of the main cabinet 20 along the length direction. In the present application, the rotating mechanism 40 can adopt the structure form of the rotating driving mechanism in the publication No. CN108362071A, or the structure form in the automatic opening and closing door module in the patent No. CN209726616U, or other rotating mechanisms in the prior art which can drive the door body 30 to rotate relative to the main cabinet 20. The ejection mechanism 50 can adopt the structure form of the ejection mechanism 50 in the publication No. CN109629948A or the publication No. CN108362071A, or other structures in the prior art which can realize the ejection of the door body 30. The rotating mechanism 40 and the ejection mechanism 50 are not the focus of the present application, and the structure of the rotating mechanism 40 and the ejection mechanism 50 is not limited and described.

[0065] Figure 4 The structure schematic diagram of the turnover beam 60 and the turnover driving mechanism 10 in the closed door state is provided for the embodiment of the present application, Figure 5 The structure schematic diagram of the turnover beam 60 and the turnover driving mechanism 10 in the open door state is provided for the embodiment of the present application. As shown in Figure 4 and Figure 5 The turnover beam 60 is arranged in the vertical direction, one of the main cabinet 20 and the turnover beam 60 is provided with a guide protrusion 601, and the other of the main cabinet 20 and the turnover beam 60 is provided with a guide groove 201, and the guide protrusion 601 and the guide groove 201 are in sliding connection. The driving unit 3 includes a driving transmission assembly 32 and a rotating arm 31, the driving transmission assembly 32 is configured to drive the rotating arm 31 to rotate horizontally to drive the push rod 1 to rotate, so that the turnover beam 60 is turned over under the guidance of the guide protrusion 601 and the guide groove 201.

[0066] The refrigerator provided by the embodiment can realize automatic overturning of the overturning beam 60 in the door closing process and automatic opening and closing door actions of the refrigerator with the overturning beam 60 by adopting the rotating arm 31 to push the push rod 1 and drive the overturning beam 60 to overturn under the sliding guiding action of the guiding protrusion 601 and the guiding groove 211. The rotating arm 31 is not connected with the push rod 1, the overturning beam 60 can be arranged separately from the driving unit 3, the structural complexity at the overturning beam 60 is reduced, and the processing of the overturning beam 60 is facilitated. Meanwhile, since most of the existing refrigerators are provided with the guiding protrusion 601 and the guiding groove 211 structure, the overturning driving mechanism 10 provided by the embodiment can be arranged on the basis of the existing refrigerator structure, the modification cost is small, the versatility is strong, and the production cost of the refrigerator is reduced.

[0067] In the embodiment, the guiding protrusion 601 is arranged at the top of the overturning beam 60, and the guiding groove 211 is arranged at the inner side of the top of the main cabinet 20. In another embodiment, the guiding protrusion can be arranged on the main cabinet, and the guiding groove can be arranged on the overturning beam 60. In still another embodiment, the guiding protrusion (or the guiding groove) can be arranged at the bottom of the overturning beam 60, and the guiding groove (or the guiding protrusion) is correspondingly arranged. The position of the guiding protrusion and the guiding groove is not limited in the present application, and the guiding protrusion and the guiding groove capable of guiding the overturning of the overturning beam 60 relative to the main cabinet 20 in the prior art can be applied to the present application.

[0068] In the embodiment, the guiding protrusion 601 has a guiding arc surface 6011, the guiding groove 211 has a guiding groove wall 2111 matched with the guiding arc surface 6011, the guiding arc surface 6011 contacts with the guiding groove wall 2111 during the overturning of the overturning beam 60, and the guiding arc surface 6011 slides along the guiding groove wall 2111, so that the guiding arc surface 6011 and the guiding groove wall 2111 cooperate to limit the overturning action of the overturning beam 60. The design of the shape and structure of the guiding groove 211 and the guiding protrusion 601 can refer to the prior art, and the present embodiment will not be described in detail.

[0069] The position of the overturning beam 60 when the guiding protrusion 601 just enters the guiding groove 211 and contacts with the groove wall of the guiding groove 211 is the first position, and the position of the overturning beam 60 when the door body 30 is completely closed is the second position. Preferably, when the overturning beam 60 is at the second position, the driving unit 3 stops at a preset initial position, and the projection of the rotating arm 31 on the horizontal plane is located outside the projection of the guiding groove 211 on the horizontal plane. With this arrangement, when the overturning driving mechanism 10 is not in action and the overturning beam 60 overturns from the second position to the first position, the push rod 1 does not contact with the rotating arm 31, so that the refrigerator can be compatible with the original manual opening and closing door actions of the refrigerator without interfering with the overturning driving mechanism 10, thereby improving the operation flexibility of the refrigerator.

[0070] More preferably, in the present embodiment, the poking rod 1 is vertically arranged at the upper end surface of the guide protrusion 601 to improve the convenience of poking the poking rod 1 by the rotating arm 31. In other embodiments, the poking rod 1 can also be horizontally or vertically arranged at the side of the guide protrusion 601 away from the door body 30.

[0071] Figure 6 is Figure 5 The split structure diagram of the structure in the middle is shown in Figure 6 More preferably, the rotating arm 31 includes a shaft connecting portion 311 arranged vertically and an extension arm portion 312 extending radially outward along the shaft connecting portion 311, the shaft connecting portion 311 is in transmission connection with the driving transmission assembly 32, and the extension arm portion 312 is uniformly spaced along the circumference of the shaft connecting portion 311 and at least two, and when the guide protrusion 601 extends into the guide groove 211, the poking rod 1 is located between the adjacent two extension arm portions 312. In this arrangement, by matching the angle between the adjacent two extension arm portions 312 with the rotation angle required for the rotating arm 31 to complete a turnover of the turnover beam 60 once, the state of the rotating arm 31 after completing a turnover of the turnover beam 60 can be consistent with the state before turnover, and no additional resetting operation is required before the next turnover of the turnover beam 60, thereby improving the resetting performance, operation and control convenience of the turnover driving mechanism 10. In other embodiments, the extension arm portion 312 can also be arranged only one, at this time, the rotating arm 31 is reset by the driving transmission assembly 32 driving the rotating arm 31 to the initial position, or by the reverse rotation of the rotating arm 31 during the opening and closing of the door. In the present embodiment, the initial position refers to the position where the rotating arm 31 can contact the poking rod 1 for the least time after being driven to rotate, when the rotating arm 31 has only one extension arm portion 312, the rotating arm 31 can be reset by rotating one revolution, and when the rotating arm 31 has multiple extension arm portions 312, the rotating arm 31 can be reset by rotating a corresponding angle, for example, when there are two extension arm portions 312, rotating 180° can reset the position of the rotating arm 31.

[0072] In the present embodiment, since the turnover beam 60 is arranged on the upper door body 301 on the left side of the refrigerator, when the rotating arm 31 rotates counterclockwise (as viewed from the top of the refrigerator), the turnover beam 60 is driven to realize the turnover of the door body 30 during closing. In other embodiments, the turnover beam 60 can also be arranged at the upper door body 301 on the right side of the refrigerator, at this time, when the rotating arm 31 rotates clockwise (as viewed from the top of the refrigerator), the turnover beam 60 is driven to realize the turnover of the door body during opening.

[0073] In the embodiment, the number of the extension arm portions 312 is related to the overturning stability of the overturning beam 60 and the size of the overturning beam 60: the more the number of the extension arm portions 312, the smaller the rotation angle of the rotating arm 31 required for the overturning beam 60 to complete one overturning, that is, the greater the curvature change of the guide groove wall 2111, which is not conducive to the smooth overturning of the overturning beam 60, and the less the number of the extension arm portions 312, the greater the rotation angle of the rotating arm 31 required for the overturning beam 60 to complete one overturning, that is, the smaller the curvature change of the guide groove wall 2111, which increases the overturning stability of the overturning beam 60, but the size of the guide protrusion 601 is increased accordingly. In the embodiment, the number of the extension arm portions 312 is three, and the included angle between two adjacent extension arm portions 312 is 120°, that is, the rotating arm 31 rotates by 120° to complete one overturning of the overturning beam 60, which can reduce the size of the overturning beam 60 while maintaining the smooth movement of the overturning beam 60. In other embodiments, the number of the extension arm portions 312 can also be two or more.

[0074] Figure 7 is a structural schematic view of the driving transmission assembly 32, as shown in Figure 6 and Figure 7 In the embodiment, the driving transmission assembly 32 includes a driving motor 321, a transmission assembly, and a driving shaft 323. Preferably, the driving motor 321 and the transmission assembly are both arranged in a protective shell 33 arranged outside the top of the main cabinet 20, and the protective shell 33 includes an upper shell 331 and a lower shell 332 which are connected by snap-fitting, and the lower shell 332 is detachably connected with the top plate of the main cabinet 20. The driving shaft 323 is arranged vertically, and the upper end of the driving shaft 323 penetrates the top plate of the main cabinet 20 and enters the protective shell 33, and the lower end of the driving shaft 323 is sleeved with the rotating arm 31. By arranging the driving motor 321 and the transmission assembly outside the top of the main cabinet 20, the occupation of the refrigerator cold storage space by the overturning driving mechanism 10 can be reduced. In another embodiment, the output shaft of the driving motor 321 can also be arranged vertically, and the shaft connecting portion 311 of the rotating arm 31 and the driving motor 321 are connected by a shaft coupling or the like, so that the driving motor 321 directly drives the rotating arm 31 to rotate. In another embodiment, all components of the driving unit 3 can be arranged inside the main cabinet 20, which is not limited by the present application. The driving motor 311 can be various types of rotary motors such as a stepping motor, a servo motor, and a reduction motor, and the type of the driving motor 311 is not limited by the present application.

[0075] Further, the transmission assembly comprises a worm sleeved on the output shaft of the driving motor 321, a worm wheel engaged with the worm, an input gear coaxially arranged with the worm wheel, an output gear 322 sleeved on the driving shaft 323, and an intermediate transmission gear set engaged between the input gear and the output gear 322. With such a structure, the number of stages of the intermediate transmission gear set can be set to reduce the speed of the driving shaft 323, increase the torque of the driving shaft 323, and thus improve the overturning reliability and stability of the overturning beam 60. In this embodiment, the intermediate transmission gear set comprises a first gear coaxially arranged with a second gear and a third gear coaxially arranged with a fourth gear, wherein the first gear is engaged with the input gear, the second gear is engaged with the third gear, and the fourth gear is engaged with the output gear 322. In other embodiments, the number of intermediate transmission gear sets and the number of teeth of each gear can be set according to the required transmission ratio, which is a conventional technical means in the art, and will not be described in detail in this embodiment.

[0076] The fixed seat 2 is arranged on the inner side of the top of the main cabinet body 20, and a guide groove 211 is formed in the fixed seat 2. To protect the rotating arm 31, the fixed seat 2 comprises an upper seat body 22 and a lower seat body 21 which are fastened together, the upper seat body 22 is connected to the inner side of the top plate of the main cabinet body 20, and the lower seat body 21 is detachably connected to the upper seat body 22 by screw connection or clamping connection. The guide groove 211 is formed in the bottom of the lower seat body 21 and penetrates through the lower seat body 21. The rotating arm 31 is sleeved on the driving shaft 323, and the rotating arm 31 is higher than the connecting surface of the lower seat body 21 and the upper seat body 22.

[0077] A cylindrical accommodating cavity is formed in the connecting surface of the upper seat body 22 and the lower seat body 21, for accommodating the rotating arm 31. A through hole 221 is vertically formed in the upper seat body 22 and communicates with the accommodating cavity, for allowing the driving shaft 323 to pass into the fixed seat 2 and connect with the rotating arm 31. Preferably, the accommodating cavity is open to one side of the overturning beam 60, and the upper seat body 22 and the lower seat body 21 are fastened together at the end away from the overturning beam 60, so that the guide groove 211 formed in the lower seat body 21 and part of the rotating arm 31 are exposed to the fixed seat 2. With such a structure, the interference between the rotating arm 31 and the upper seat body 22 when the rotating arm 31 is in the guide groove 211 can be avoided, the processing of the fixed seat 2 is simplified, and the overall thickness of the fixed seat 2 is reduced.

[0078] Preferably, in the embodiment, the output gear 322 is a one-way gear, and the output torque of the one-way gear is in the same direction as the rotational torque required by the turnover beam 60 when closing the door, that is, in the embodiment, the rotation direction of the one-way gear is counterclockwise. In this way, when the door body 30 is in an open state and the turnover mechanism fails to keep the rotating arm 31 in the middle position, the door can be closed manually, so that the push rod 1 rotates and contacts the rotating arm 31, drives the rotating arm 31 and the drive shaft 323 to rotate counterclockwise until the rotating arm 31 is separated from the push rod 1; when the turnover driving mechanism 10 is in a closing action and the door body 30 is subjected to a force in the same direction as the closing action, because the position of the push rod 1 is in front of the rotating arm 31 at this time, the turnover beam and the push rod 1 will reach the closing position before the rotating arm 31 without any obstacle, and the drive motor 321 and the transmission assembly continue the closing action until they stop at the preset position.

[0079] Figure 8 The split structure diagram of the output gear 322 provided by the embodiment of the application is shown in FIG. 6, which comprises a gear body 3221, a cover plate 3223, a ratchet wheel 3222, a sliding block 3224 and a spring 3225 arranged coaxially. Figure 8 As shown in FIG. 6, the ratchet wheel 3222 comprises a plurality of ratchet teeth 32221 uniformly spaced along the circumference thereof, and each ratchet tooth 32221 has a back side, a circumferential side and a front side connected in sequence. The back side of each ratchet tooth 32221 is in an arc structure, and one end of the back side is connected with the front side of the adjacent ratchet tooth 32221, and the other end extends counterclockwise away from the center of the ratchet wheel 3222 and is connected with the circumferential side. The circumferential side of all the ratchet teeth 32221 is located on the same circumference, and one end of the circumferential side is connected with the back side, and the other end is connected with the front side. The front side is in a planar structure. A cylindrical mounting groove 32211 is formed in the end face of the gear body 3221, and a plurality of sliding grooves 32212 are uniformly spaced along the circumference of the groove wall of the mounting groove 32211 and are in communication with the mounting groove 32211. One end of the sliding block 3224 abuts against the back side of the ratchet tooth 32221 and is in surface contact with the back side, and the other end extends into the sliding groove 32212 and is in sliding connection with the groove wall of the sliding groove 32212. The spring 3225 is connected between the sliding block 3224 and the groove bottom of the sliding groove 32212.

[0080] When the ratchet wheel 3222 rotates clockwise, the slider 3224 slides relative to the back side of the ratchet wheel 3222 in a direction away from the center of the ratchet wheel 3222, and the back side of the ratchet wheel 3222 presses the slider 3224 to slide in a direction deep into the sliding groove 32212, and the spring 3225 is compressed. Continuous rotation of the ratchet wheel 3222 makes the slider 3224 slide across the back side and the peripheral side of a ratchet tooth 32221, and then move to the back side of an adjacent ratchet tooth 32221, so that the slider 3224 continues to slide relative to the ratchet wheel 3222, that is, at this time the ratchet wheel 3222 rotates and the gear body 3221 does not rotate with the ratchet wheel 3222. When the ratchet wheel 3222 rotates counterclockwise, the slider 3224 slides relative to the back side of the ratchet wheel 3222 in a direction close to the center of the ratchet wheel 3222, until one side of the slider 3224 abuts against the front side of an adjacent ratchet tooth 32221, and then the ratchet wheel 3222 rotates with the slider 3224, that is, the ratchet wheel 3222 and the gear body 3221 rotate synchronously.

[0081] To prevent the ratchet wheel 3222 from disengaging from the mounting groove 32211, a sealing plate 3223 is arranged at the opening of the mounting groove 32211. Preferably, the depth of the mounting groove 32211 is equal to or slightly smaller than the thickness of the ratchet wheel 3222, and the sealing plate 3223 abuts against the end face of the gear body 3221 to avoid axial movement of the ratchet wheel 3222 in the mounting groove 32211. Further, a plurality of clamping protrusions 32213 are protruded on the end face of the gear body 3221 and spaced apart in the circumferential direction. The clamping protrusions 32213 are preferably uniformly distributed in the circumferential direction of the gear body 3221. A plurality of clamping grooves 32231 are spaced apart in the circumferential direction of the sealing plate 3223, and the clamping grooves 32231 are arranged one by one corresponding to the clamping protrusions 32213, and the clamping protrusions 32213 are clamped in the clamping grooves 32231. The arrangement of the clamping protrusions 32213 and the clamping grooves 32231 helps to improve the coaxiality of the installation of the sealing plate 3223 and the gear body 3221, and prevents the center through hole on the gear body 3221 from being misaligned with the center through hole on the sealing plate 3223. More preferably, the clamping protrusions 32213 and the clamping grooves 32231 are both fan ring structures, and the major diameter of the fan ring structure is equal to the outer diameter of the sealing plate 3223.

[0082] The structure of the one-way gear provided in the present embodiment is an exemplary structure, and it can be understood that the structures of one-way gears in the prior art can be applied to the present application, and the present application does not make specific limitations on the structure of the one-way gear.

[0083] Figure 9 The structure of the driving shaft 323 and the rotating arm 31 provided in the present embodiment is shown in the structure diagram of the driving shaft 323 and the rotating arm 31 as shown in Figure 9As shown, in a further preferred embodiment, a torsion spring 34 is sleeved on the output shaft, one end of the torsion spring 34 is fixed relative to the rotating arm 31, and the other end of the torsion spring 34 is fixed relative to the drive shaft 323. The torsion spring 34 is configured such that when the flipping drive mechanism 10 is operating normally, the torque of the torsion spring 34 drives the drive shaft 323 and the rotating arm 31 to move simultaneously and push the flipping beam 60 to flip. When the flipping drive mechanism 10 malfunctions and the rotating arm 31 is stuck in the middle position and the door 30 is in the closed state, the door can be opened manually, causing the lever 1 to rotate and contact the rotating arm 31. The lever 1 applies a clockwise torque to the rotating arm 31. When this torque is greater than the torque of the torsion spring 34, the rotating arm 31 rotates in the opposite direction, causing the lever 1 to pass over the rotating arm 31 to achieve the door opening action. After the lever 1 disengages from the rotating arm 31, the rotating arm 31 returns to its original position under the action of the torsion spring 34. The door can then be closed manually, causing the lever 1 to move the rotating arm 31 counterclockwise, causing the rotating arm 31 to drive the drive shaft 323 and the output gear 322 to rotate counterclockwise until the rotating arm 31 disengages from the lever 1. Furthermore, the torsion spring 34 can also mitigate the impact of the impact force on the drive transmission assembly 32 during the flipping process of the flipping beam 60, and provide overload protection for the drive motor 321, transmission assembly, drive shaft 323 and rotating arm 31.

[0084] Furthermore, to prevent the rotating arm 31 from moving downwards along the axial direction of the drive shaft 323, preferably, a limiting washer 35 is fitted on the drive shaft 323, and a limiting pin 37 passes through the lower end of the drive shaft 323. Both ends of the limiting pin 37 protrude from the drive shaft 323, the lower end face of the limiting washer 35 abuts against the limiting pin 37, and the upper end face of the limiting washer 35 abuts against the lower end face of the rotating arm 31. To prevent the rotating arm 31 from moving upwards along the axial direction of the drive shaft 323, preferably, a limiting retaining ring 36 is fitted on the drive shaft 323. The lower surface of the limiting retaining ring 36 is connected to the upper end of the torsion spring 34, and the upper end face of the limiting retaining ring 36 abuts against the inner surface of the main cabinet 20. In other embodiments, the axial positioning of the rotating arm 31 on the drive shaft 323 can also be achieved by setting a shoulder structure on the drive shaft 323.

[0085] like Figure 7 As shown, in this embodiment, to monitor the position of the rotating arm 31, the flipping drive mechanism 10 preferably further includes a position detection component 4. More preferably, the position detection component 4 includes a photoelectric sensor 41 and a light-shielding member 42. The photoelectric sensor 41 includes a circuit board and a transmitting part and a receiving part spaced apart on the circuit board. The circuit board is detachably connected to the housing by screws or the like. The transmitting part and the receiving part are located at the end of the circuit board facing the output gear 322. The light-shielding member 42 is sleeved on the drive shaft 323, and a light-shielding part 421 is provided on the light-shielding member 42. When the light-shielding member 42 rotates with the drive shaft 323, the light-shielding part 421 intermittently extends between the transmitting part and the receiving part to block the light emitted by the photoelectric sensor 41, thereby changing the output signal of the photoelectric sensor 41.

[0086] In the embodiment, the light shielding portions 421 are uniformly spaced along the circumference of the light shielding member 42, and the number of the light shielding portions 421 corresponds to the number of the extension arm portions 312, so that the position of the rotating arm 31 can be determined by the signal change of the photoelectric sensor 41. In the embodiment, the position of the rotating arm 31 is detected by the non-contact light sensor, which has a long service life and high detection accuracy. In other embodiments, the position of the rotating arm 31 can be monitored by a mechanical angle sensor, which will not be described in detail.

[0087] Further, in the embodiment, in order to ensure that the driving shaft 323 rotates synchronously with the ratchet wheel 3222 and the light shielding member 42, the driving shaft 323 is provided with anti-rotation grooves 3231 along the axial direction, and the inner side wall of the central through hole of the ratchet wheel 3222 and the inner side wall of the central through hole of the light shielding member 42 are both provided with anti-rotation protrusions 32222 which are adapted to the anti-rotation grooves 3231. The anti-rotation protrusions 32222 are inserted into the anti-rotation grooves 3231 to prevent the driving shaft 323 from rotating relative to the ratchet wheel 3222 or the light shielding member 42, thereby improving the synchronous motion accuracy of the driving shaft 323, the ratchet wheel 3222 and the light shielding member 42, and improving the rotation speed and torque transmission accuracy and the accuracy of position detection. In the embodiment, the anti-rotation grooves 3231 are uniformly spaced along the circumference of the driving shaft 323, and the anti-rotation protrusions 32222 are correspondingly provided. In other embodiments, the anti-rotation protrusions 32222 can be provided on the driving shaft 323, and the anti-rotation grooves 3231 can be provided on the inner side wall of the central through hole of the ratchet wheel 3222 and the light shielding member 42, and the number of the anti-rotation grooves 3231 and the anti-rotation protrusions 32222 can be determined according to requirements.

[0088] The embodiment also provides a refrigerator automatic door closing method, which is applied to the refrigerator and includes the following steps.

[0089] The rotating mechanism 40 drives the door body 30 to perform closing rotation;

[0090] When the door body 30 rotates to the preset position, the driving unit 3 of the turnover driving mechanism 10 acts and drives the rotating arm 31 to rotate, and the rotation of the rotating arm 31 drives the turnover beam 60 to overturn;

[0091] When the door body 30 is completely closed, the rotating mechanism 40 stops acting and the driving unit 3 stops at the preset initial position.

[0092] Note that the above merely describes preferred embodiments of the present application and the principles of the technology applied. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and that various obvious changes, modifications and substitutions can be made without departing from the scope of the present application. Therefore, although the present application has been described in detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the claims.

Claims

1. A refrigerator comprising a main cabinet (20), the opposite sides of the main cabinet (20) are hingedly connected with door bodies (30), the inner side of one of the door bodies (30) is pivotally connected with a turnover beam (60), one of the main cabinet (20) and the turnover beam (60) is provided with a guide protrusion (601), the other of the main cabinet (20) and the turnover beam (60) is provided with a guide slot (211), the guide protrusion (601) and the guide slot (211) are in sliding fit, characterized in that, Further comprising a turnover driving mechanism (10), the turnover driving mechanism (10) comprises: A dial lever (1) protruding on the turnover beam (60); A driving unit (3) comprising a driving transmission assembly (32) and a rotating arm (31), the driving transmission assembly (32) is configured to drive the rotating arm (31) to rotate horizontally to dial the dial lever (1) to make the turnover beam (60) turn over under the guidance of the guide protrusion (601) and the guide groove (211) The guide protrusion (601) has a guide arc surface (6011), and the guide groove (211) has a guide groove wall (2111) matched with the guide arc surface (6011), during the turnover of the turnover beam (60), the guide arc surface (6011) is in contact with the guide groove wall (2111), and the guide arc surface (6011) slides along the guide groove wall (2111).

2. The refrigerator according to claim 1, characterized in that, When the driving unit (3) stops at a preset initial position, the projection of the rotating arm (31) on a horizontal plane is located outside the projection of the guide groove (211) on the horizontal plane.

3. The refrigerator according to claim 1, characterized in that, The rotating arm (31) comprises a shaft connecting portion (311) and an extension arm portion (312) extending radially outward along the shaft connecting portion (311), the shaft connecting portion (311) is vertically arranged and drivingly connected with the driving transmission assembly (32), and the extension arm portion (312) is uniformly and spacedly arranged along the circumference of the shaft connecting portion (311), and the dial lever (1) is located between two adjacent extension arm portions (312) when the guide protrusion (601) is inserted into the guide groove (211).

4. The refrigerator according to claim 3, characterized in that, The driving transmission assembly (32) comprises: A driving motor (321); A transmission assembly comprising a driving shaft (323) arranged vertically, an output shaft of the driving motor (321) is connected with the driving shaft (323), and the rotating arm (31) is sleeved on the driving shaft (323).

5. The refrigerator according to claim 4, characterized in that, A torsional spring (34) is sleeved on the driving shaft (323), one end of the torsional spring (34) is fixed relative to the rotating arm (31), and the other end of the torsional spring (34) is fixed relative to the driving shaft (323).

6. The refrigerator according to claim 4, characterized in that, The transmission assembly further comprises: A worm is sleeved on the output shaft of the driving motor (321); A worm wheel is engaged with the worm; An input gear is coaxially arranged with the worm wheel; An output gear (322) is sleeved on the driving shaft (323); An intermediate transmission gear set is engaged between the input gear and the output gear (322).

7. The refrigerator according to claim 6, characterized in that The output gear (322) is a one-way gear, and the output torque of the one-way gear is in the same direction as the torque required for the turnover of the turnover beam (60) during the closing process.

8. The refrigerator according to claim 7, characterized in that, The output gear (322) comprises: A gear body (3221) having an installation groove (32211) formed in one end face, and a sliding groove (32212) formed in a groove side wall of the installation groove (32211). A ratchet wheel (3222) is arranged in the mounting groove (32211), and a plurality of ratchet teeth (32221) are uniformly arranged on the circumference of the ratchet wheel (3222); A sliding block (3224) is arranged at one end of the ratchet teeth (32221) and the other end is in sliding connection with the groove wall of the sliding groove (32212); A spring (3225) is connected at one end with the sliding block (3224) and at the other end with the groove bottom of the sliding groove (32212) away from the ratchet wheel (3222).

9. The refrigerator according to claim 4, characterized in that, The turnover driving mechanism further comprises: A position detection assembly (4) is arranged for detecting the position of the rotating arm (31).

10. The refrigerator according to claim 9, characterized in that, The position detection assembly (4) comprises: A photoelectric sensor (41) comprising a circuit board and a receiving part and a transmitting part arranged on the circuit board in a spaced and opposite manner; A light shielding member (42) is sleeved on the driving shaft (323), and the light shielding member (42) has a light shielding part (421), and the light shielding member (42) can rotate synchronously with the driving shaft (323) to make the light shielding part (421) intermittently extend into the gap between the receiving part and the transmitting part to shield light.

11. The refrigerator according to any one of claims 1 to 10, characterized in that, Each door body (30) is correspondingly provided with a rotating mechanism (40), and the rotating mechanism (40) is configured to drive the corresponding door body (30) to rotate relative to the main cabinet body (20).

12. A refrigerator automatic door closing method, characterized by, Applied to the refrigerator as claimed in claim 11, and comprising the following steps: The rotating mechanism (40) drives the door body (30) to perform door closing rotation; When the door body (30) rotates to a preset position, the driving unit (3) of the turnover driving mechanism (10) acts and drives the rotating arm (31) to rotate, and the rotation of the rotating arm (31) drives the turnover beam (60) to overturn; When the door body (30) is completely closed, the rotating mechanism (40) stops acting and the driving unit (3) stops to a preset initial position.

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