CN113027280A - Automatic door opening and closing mechanism and refrigerator using same - Google Patents

Abstract

The invention relates to an automatic door opening and closing mechanism and a refrigerator using the same, comprising: a power source capable of outputting power in a forward and reverse rotation manner; the telescopic driving component is suitable for driving the refrigerator door body to open and close relative to the refrigerator body; the telescopic driving component comprises a screw rod in transmission connection with the power source, a nut in transmission connection with the screw rod, and a telescopic rod matched and connected with the nut; the telescopic rod is provided with a clutch groove, and the nut is provided with a clutch hook suitable for being embedded into the clutch groove; a clutch notch is arranged in the clutch groove; and the clutch notch and the clutch hook are suitable for forming a connection state and a disconnection state. The invention can reduce the hidden danger of damage of the automatic door opening and closing mechanism when the automatic door opening and closing mechanism is subjected to sudden impact external force in the driving process.

Description

Automatic door opening and closing mechanism and refrigerator using same

Technical Field

The invention relates to the technical field of household appliances, in particular to an automatic door opening and closing mechanism and a refrigerator using the same.

Background

Due to the popularization of large-capacity refrigerators, the overall size of the refrigerator is larger and larger, and additional functions of the refrigerator are more and more, such as a door body with an ice making function, an internet-of-things large-screen display door body, a door-in-door and the like. The refrigerator door body not only has more and more functions, and weight is also more and more heavy, and under the actual use condition, a lot of users feed back the refrigerator door and open more and more inconveniently to draw at every turn and open and can drag the refrigerator and remove or rock. This is not only because the functional mounting of the door body itself becomes heavy, but also because the area of the door body becomes large and the resistance due to the negative pressure becomes large because of the negative pressure required for sealing the refrigerator.

To the problem that exists, current refrigerator of many brands has all carried on electronic helping hand system of opening the door to this problem, and the electric door body of opening is a distance, eliminates the overwhelming majority resistance of opening the door that causes by negative pressure and magnetism sealing strip, and the user opens just a lot of conveniently again. However, the conventional door opening auxiliary system cannot achieve a large angle for automatically opening the door, and a user needs to manually open the door to a position where the user can conveniently store and take articles, and cannot automatically close the refrigerator door in an open state.

In addition, the whole technical scheme restriction of the automatic door opening and closing system who has carried on extra whole journey auxiliary switch door body among the prior art is more, and there is hidden danger in the reliability, mainly embodies in the automatic door opening and closing in-process if meet sudden external force, and the transmission part of door opening and closing system causes the damage easily to the cost is higher, is unfavorable for the popularization that middle-grade refrigerator model used.

Disclosure of Invention

The invention aims to provide an automatic door opening and closing mechanism, which aims to solve the technical problem of reducing the hidden danger of damage of the automatic door opening and closing mechanism when sudden impact external force is applied to the automatic door opening and closing mechanism in the driving process.

The second purpose of the invention is to provide a refrigerator, which solves the technical problem of reducing the hidden danger of damage when the automatic door opening and closing mechanism is subjected to sudden impact external force in the driving process.

The automatic door opening and closing mechanism of the invention is realized as follows:

an automatic door opening and closing mechanism for a refrigerator, comprising:

a power source capable of outputting power in a forward and reverse rotation manner;

the telescopic driving component is suitable for driving the refrigerator door body to open and close relative to the refrigerator body; the telescopic driving assembly comprises a screw rod in transmission connection with a power source, a nut in transmission connection with the screw rod, and a telescopic rod matched and connected with the nut; wherein

The telescopic rod is provided with a clutch groove, and the nut is provided with a clutch hook suitable for being embedded into the clutch groove; a clutch notch is formed in the clutch groove; and the clutch notch and the clutch hook are suitable for forming a connection state and a disconnection state.

In a preferred embodiment of the present invention, the engaging and disengaging groove is opened on the outer wall surface of the telescopic rod, and the engaging and disengaging groove is arranged along an axial direction parallel to the telescopic rod; and

the outer wall surface of the telescopic rod is provided with at least one clutch groove.

In the preferred embodiment of the invention, a clutch gap is arranged on one groove wall of each clutch groove;

and the clutch notch is arranged at the middle position or the approximate middle position of the clutch groove.

In a preferred embodiment of the present invention, the clutch hook includes a body adapted to be embedded in the clutch groove, and a boss portion and a support portion integrally formed on the body; wherein

The boss part is suitable for being matched with the clutch notch;

the boss part is provided with a first clutch surface and a second clutch surface.

In a preferred embodiment of the present invention, the supporting portion is an arc-shaped structural body; and

the support part is provided with a sliding support surface which is suitable for sliding contact with the other groove wall opposite to the groove wall provided with the clutch gap in the clutch groove.

In a preferred embodiment of the invention, the nut comprises a nut inner hoop, a nut outer hoop and a nut guide rib arranged between the nut inner hoop and the nut outer hoop; wherein

The nut inner hoop is provided with an inner thread which is suitable for being in spiral connection with the screw rod;

the clutch hook is convexly arranged on one axial end of the nut guide rib;

the part of the telescopic rod, which is provided with the clutch groove, is inserted between the holes formed by the nut inner hoop and the nut outer hoop.

In a preferred embodiment of the present invention, the telescopic driving assembly further comprises a guide tube rotatably connected with the refrigerator body through the housing; and

the guide pipe is sleeved outside the telescopic rod matched with the nut;

the inner wall of the guide pipe is provided with a guide groove suitable for being matched with the nut guide rib.

In a preferred embodiment of the present invention, the first clutch surface is disposed on a side of the boss portion facing the movable end of the telescopic rod, and the second clutch surface is disposed on a side of the boss portion facing the fixed end of the telescopic rod;

and a first clutch included angle formed by the first clutch surface and the groove surface of the clutch groove is smaller than a second clutch included angle formed by the second clutch surface and the groove surface of the clutch groove, and the second clutch included angle is larger than 90 degrees.

In a preferred embodiment of the invention, a sealing end cover is arranged at the end part of the telescopic rod, which is far away from the movable end of the telescopic rod;

the sealing end cover is provided with a sealing thread and a sealing outer hoop; the inner pipe wall of one end of the telescopic rod, which is far away from the movable end of the telescopic rod for covering the telescopic rod, is provided with locking threads suitable for being matched and connected with the sealing threads; and

and a bush is sleeved on the telescopic rod and positioned between the nut and the sealing end cover.

In an optional embodiment of the present invention, the automatic door opening and closing mechanism further comprises a transmission clutch assembly disposed between the screw and the power source;

the transmission clutch assembly comprises a helical gear sleeved on the screw, a clutch joint part and a clutch driving part which is rotatably sleeved and matched with the clutch joint part; wherein

The bevel gear is connected with a power source to transmit torque; the helical gear is axially matched and connected with the clutch combination part so as to transmit the torque transmitted by the end of the helical gear to the screw rod;

the clutch driving component is connected with an electromagnet which is suitable for driving the clutch driving component to move axially.

The refrigerator of the invention is realized as follows:

a refrigerator, comprising: the automatic door opening and closing mechanism.

Compared with the prior art, the invention has the following beneficial effects: the utility model discloses an automatic door opening and closing mechanism and use its refrigerator, through the separation and reunion trip that is equipped with on the nut and the switching of the separation and reunion breach in the separation and reunion groove that is equipped with on the telescopic link between the breach and the off-state, can realize that the axial atress on the telescopic link surpasss certain restriction after, the separation and reunion trip on the nut can break away from with the separation and reunion breach on the telescopic link, the refrigerator door body just can be relatively free open and close, under this condition, when the refrigerator use in inevitable cause the refrigerator door body unexpected impact external force, the separation and reunion trip on the nut of the automatic door opening mechanism of the invention can break away from with the separation and reunion breach on the telescopic link by.

Furthermore, for the automatic door opening and closing mechanism, no additional part is added, and the clutch function requirement between the nut and the telescopic rod can be realized only by the structural optimization of the nut and the telescopic rod. The cost of parts can be greatly reduced and the size of the installation space can be reduced.

In addition, the size of the clutch structure formed by the clutch hook and the clutch notch is mainly in the axial extension direction of the movement of the telescopic rod, and the clutch structure does not influence the radial size perpendicular to the movement direction of the telescopic rod on the automatic door opening and closing mechanism, so that the height size control of the automatic door opening and closing mechanism installed on the refrigerator is facilitated.

In addition, the clutch hook on the nut realizes the switching of the clutch state by means of the elastic deformation of the clutch hook, and the deformation resistance of the part of the clutch hook is increased by means of the supporting part, so that the structure avoids the disadvantages of cost and size space of the addition of auxiliary elastic elements such as springs and the like.

Drawings

The invention is further illustrated with reference to the following figures and examples.

FIG. 1 shows a schematic view of an automatic door opening and closing mechanism of an embodiment assembled on a refrigerator in one implementation;

FIG. 2 shows a schematic view of a telescoping drive assembly of the automatic door opening and closing mechanism of the embodiment;

FIG. 3 is a schematic view showing the assembly of the automatic door opening and closing mechanism with the refrigerator door and the refrigerator main body according to the embodiment;

FIG. 4 is a schematic view showing the axis of a main body connecting pin shaft of the automatic door opening and closing mechanism of the embodiment assembled with a refrigerator door body and a refrigerator main body positioned inside the axis of the door body connecting pin shaft;

FIG. 5 shows a first schematic diagram of the automatic door opening and closing mechanism of the embodiment, which shows that the axes of the main body connecting pin shafts of the automatic door opening and closing mechanism and the refrigerator main body after being assembled are located at the equal positions of the inner side and the outer side of the axes of the door body connecting pin shafts;

FIG. 6 is a second schematic view showing the same positions of the axes of the main body connecting pin shafts of the automatic door opening and closing mechanism of the embodiment, the refrigerator door body and the refrigerator main body after assembly, the positions of the axes of the main body connecting pin shafts being located on the inner side and the outer side of the axes of the door body connecting pin shafts;

FIG. 7 is a schematic view showing the automatic door opening and closing mechanism of the embodiment in a state of being coupled with a refrigerator door and a refrigerator main body;

fig. 8 is a schematic view illustrating the connection between the expansion link and the nut of the automatic door opening and closing mechanism according to the embodiment;

FIG. 9 shows a schematic view of a telescoping rod of the automatic door opening and closing mechanism of the embodiment;

FIG. 10 illustrates a first perspective view schematic of a nut of the automatic door opening and closing mechanism of the embodiment;

FIG. 11 shows a schematic view of a closure end cap of the automatic door opening and closing mechanism of the embodiment;

FIG. 12 is a schematic view showing the structure of the nut and screw of the automatic door opening and closing mechanism in cooperation with the telescopic rod and the guide tube;

FIG. 13 is a second perspective view of the nut of the automatic door opening and closing mechanism of the embodiment;

FIG. 14 is a structural diagram illustrating a state that a clutch hook of a nut of the automatic door opening and closing mechanism is matched with a clutch notch according to the embodiment;

FIG. 15 is a schematic structural view illustrating a disengaged state of the clutch hook and the clutch notch of the nut of the automatic door opening and closing mechanism according to the embodiment;

fig. 16 is a schematic diagram illustrating the change of the matching state of the telescopic rod and the nut in the process that the refrigerator door body of the embodiment is opened by an external force and then closed by the automatic door opening and closing mechanism in the door opening process;

fig. 17 is a schematic diagram illustrating the change of the matching state of the telescopic rod and the nut in the process that the refrigerator door body is opened by the automatic door opening and closing mechanism, then the refrigerator door body is closed by an external force, and finally the refrigerator door body is closed by the automatic door opening and closing mechanism in the door opening process of the refrigerator door body according to the embodiment;

FIG. 18 shows a schematic view of a transmission clutch assembly of the automatic door opening and closing mechanism of the embodiment;

FIG. 19 is a schematic view showing a state where a clutch engaging member of a transmission clutch assembly of the automatic door opening and closing mechanism of the embodiment is disengaged from a helical gear;

FIG. 20 is a schematic view showing a clutched engaging member of a transmission clutch assembly of the automatic door opening and closing mechanism of the embodiment in a state in which the bevel gear is engaged;

fig. 21 is a schematic view showing a clutch engaging part of a transmission clutch assembly of the automatic door opening and closing mechanism of the embodiment.

In the figure: the refrigerator comprises a refrigerator main body 1, a refrigerator door 2, a refrigerator housing 3, a motor 5, an expansion link 6, a clutch groove 61, a clutch notch 62, a locking thread 63, a guide pipe 7, a nut 8, a nut outer hoop 81, a nut inner hoop 82, a nut guide rib 83, a body 84, a boss part 85, a support part 86, a first clutch surface 87, a second clutch surface 88, a sliding support surface 89, a screw rod 9, a connecting hole 11, a bearing plate 12, a door body connecting pin shaft 13, a door body hinge shaft center 15, a main body connecting pin shaft 16, a worm 17, a helical gear 18, a bush 19, a sealing end cover 20, a sealing thread 201, a sealing outer hoop 203, a transmission pin shaft 21, a fixing plate 22, an electromagnet 23, a clutch joint part 24, an outer copying part 241, an inner copying part 242 and a clutch driving part.

Detailed Description

The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.

Example 1:

referring to fig. 1 to 17, the present embodiment provides an automatic door opening and closing mechanism for a refrigerator, including: a power source capable of outputting power in positive and negative rotation and a telescopic driving component suitable for driving the refrigerator door body 2 to open and close relative to the refrigerator body. The power source adopts a motor 5, and a cover body is arranged outside the motor 5. The specific implementation principle of the automatic door opening and closing mechanism of the embodiment is to convert the rotation motion of the motor 5 into the linear telescopic motion of the telescopic rod 6 to realize the opening and closing of the refrigerator door body 2.

It should be noted that the automatic door opening and closing mechanism of the present embodiment may be specifically disposed at the top of the refrigerator, and of course, according to the application requirements of different types of refrigerator doors 2, may also be disposed at the interlayer position between the upper and lower doors, or may also be disposed at the bottom of the refrigerator and other positions near the hinge of the door rotating shaft. The automatic door opening and closing mechanism is electrically connected to the door opening and closing control component, and if the automatic door opening and closing mechanism is installed on the top of the refrigerator, the refrigerator cover 3 is arranged on the top of the refrigerator to cover the automatic door opening and closing mechanism 100, the door opening and closing control component 200 and part of hinge parts of the door body. According to the door opening and closing requirements of the refrigerator, a corresponding automatic door opening and closing mechanism is arranged at the door body hinge of the refrigerator door body 2 which needs an automatic opening and closing function.

Referring to the drawings in detail, the telescopic driving assembly comprises a screw 9 in transmission connection with a power source, a nut 8 in transmission connection with the screw 9, and a telescopic rod 6 matched and connected with the nut 8; the movable end and the fixed end of the telescopic rod 6 are respectively provided with a connecting hole 11, wherein the connecting holes 11 can be directly or indirectly arranged on the movable end and the fixed end of the telescopic rod 6, and indirectly means that the connecting holes 11 can be arranged on other components assembled at the movable end and the fixed end of the telescopic rod 6. Here, the movable end of the telescopic rod 6 is connected to the refrigerator door 2 through a connection hole 11 to perform opening and closing of the refrigerator door 2 with respect to the refrigerator main body 1, and the fixed end of the telescopic rod 6 is connected to the refrigerator body.

Specifically, a connecting pin shaft which is matched and connected with a connecting hole 11 at the movable end of the telescopic rod 6 is arranged on the refrigerator door body 2. And the refrigerator door body 2 and the refrigerator main body 1 are respectively provided with a pressure bearing plate 12 with a plane structure, so that huge stress caused by the expansion and contraction of the expansion and contraction driving assembly is borne and dispersed to the door body top plates of the refrigerator main body 1 and the refrigerator door body 2, and the phenomenon of fracture caused by overlarge stress is avoided. The connecting pin shaft is fixedly connected with a bearing plate 12 on the refrigerator door body 2.

Meanwhile, the positional relationship among the axis of the door connecting pin 13, the axis of the main body connecting pin 16, and the axis of the door hinge 15 is as shown in fig. 4. The left side and the right side of the refrigerator main body 1 are defined as outer sides, the center of the refrigerator main body 1 is defined as inner side, then the axes of the door body connecting pin shaft 13 and the main body connecting pin shaft 16 are positioned at the inner side of the axis 15 of the door body hinge, and the axis of the main body connecting pin shaft 16 is positioned at the inner side of the axis of the door body connecting pin shaft 13, so that an included angle alpha shown in the following figure is formed. The axis 15 of the door body hinge is easy to understand at the outermost side, and because the product layout is beautiful and the space utilization is facilitated, the hinges of the refrigerator door body 2 are usually arranged at the edge of the refrigerator as much as possible, and then the axis of the main body connecting pin shaft 16 is closer to the inner side relative to the axis of the door body connecting pin shaft 13.

Because the axle center of the main body connecting pin shaft 16 and the axle center of the door body hinge 15 are both fixed, and the axle center of the door body connecting pin shaft 13 rotates around the axle center of the door body hinge 15, the length relation of three sides of a triangle can be judged, and when the three axle centers form a straight line, the limit length of the telescopic driving component can be telescopic, but the telescopic limit length of the telescopic driving component can be smaller than the length of the three axle centers when the three axle centers form a straight line. Because once this limit is reached, it is unclear whether the door is retracted inwardly or continues to open when the telescopic drive assembly begins to retract the door closed. Fig. 4 shows that the axis of the main body connecting pin shaft 16 is located inside the axis of the door body connecting pin shaft 13, and an included angle α is formed. While figure 5 shows the two in equal positions on the inside and outside, no angle alpha is formed (angle zero). Both the graphic states are extreme positions which are close to the state that three axes are in a straight line, and obviously, the arrangement of the included angle alpha can open a larger angle for the refrigerator door body 2, and similarly, the opening angle of the door body can be further reduced when the axis of the main body connecting pin shaft 16 is positioned outside the axis of the door body connecting pin shaft 13, and the opening angle of the door body can gradually approach 180 degrees when the included angle alpha is large enough. However, in practical application, the angle is not set too large, because the larger the angle α is, the wider the part of the refrigerator housing 3 that needs to extend out of the refrigerator main body 1 needs to be, so as to cover the telescopic rod 6 of the door opening and closing assembly, which affects the beauty of the refrigerator, and meanwhile, if the angle α is too large, the smaller the force arm formed between the door pushing force of the telescopic driving assembly and the door body hinge axis 15 is, the larger door pushing force is needed to open the refrigerator door body 2. The refrigerator door opening angle adjusting device is generally set to meet the requirement that the opening angle of a door body exceeds 90 degrees, and whether additional increase is needed or not can be independently adjusted according to the requirement of a refrigerator type.

In addition, because the connecting holes 11 at the movable end and the fixed end of the telescopic rod 6 are fixedly connected with the connecting pin shaft on the refrigerator, the accidental impact external force on the refrigerator door body 2 can be inevitably generated in the use process of the refrigerator. The problem that all automatic door opening and closing systems of refrigerators need to overcome is solved, but most of the existing schemes do not show how to overcome the unexpected problem, namely, in the normal door opening and closing operation process, the refrigerator door body 2 is subjected to sudden impact force, and the existing systems cannot timely and effectively switch the meshing state. That is, the automatic door opening and closing system in the prior art only solves the technical problem of how to open and close the door body 2 of the refrigerator, and the problem of "impact" occurring in the period is not solved, or an electromagnetic clutch technical scheme is adopted, and the engagement and disengagement of a certain part in a transmission system are realized by electromagnetic driving to realize the switching of the clutch state, but the electromagnetic clutch technology is an "active" clutch technical scheme, is limited by response time, and cannot completely avoid two problems of "sudden" and "impact", and the "active" clutch technology generally aims at the state switching before the door opening and closing assembly works, namely the state switching between a manual door opening and closing or an electric door opening and closing, but cannot aim at the sudden state switching in the movement process.

Based on the problems, the telescopic driving component adopted by the embodiment is provided with a passive clutch structure between the telescopic rod 6 and the nut 8, so that the purpose of automatically disconnecting the connection state when being impacted is realized.

In detail, the "passive" clutch structure of the present embodiment includes a clutch groove 61 provided on the telescopic rod 6 and a clutch hook provided on the nut 8 and adapted to be embedded in the clutch groove 61; the clutch groove 61 is internally provided with a clutch notch 62; and this separation and reunion breach 62 is suitable for to form and is connected and the off-state with the separation and reunion trip, also realizes being connected between nut 8 and the telescopic link 6 through the connected state between separation and reunion breach 62 and the separation and reunion trip, and realizes breaking away from between nut 8 and the telescopic link 6 through the off-state between separation and reunion breach 62 and the separation and reunion trip.

When the axial stress on the telescopic rod 6 exceeds a certain limit, the clutch hook on the nut 8 can be separated from the clutch notch 62 on the telescopic rod 6, and the door body can be opened and closed relatively freely. The process is passive, the speed of the whole disengaging process changes along with the changing speed of the external force, if the external force applied to the telescopic rod 6 is slowly applied, the disengaging process is slowly disengaged, and if the external force is instantly applied, the disengaging process is instantly disengaged.

Still further, the clutch groove 61 is opened on the outer wall surface of the telescopic rod 6, and the clutch groove 61 is arranged along the axial direction parallel to the telescopic rod 6; regarding the clutch groove 61 of the present embodiment, the axial opening of the clutch groove 61 is provided on the fixed end of the telescopic rod 6, so that when the nut 8 is assembled with the telescopic rod 6, the nut 8 is slowly fitted with the telescopic rod 6 along the axial direction of the telescopic rod 6 from the fixed end of the telescopic rod 6.

Here, it should be noted that at least one engaging groove 61 is provided on the outer wall surface of the extendable rod 6. Referring to the drawings of the present embodiment, a pair of engaging and disengaging grooves 61 is symmetrically formed on the outer wall surface of the extendable rod 6. One of the groove walls of each clutch groove 61 is provided with a clutch notch 62; and the clutch notch 62 is provided at a middle position or substantially a middle position of the clutch groove 61. Only one clutch notch 62 is formed in each clutch groove 61, because the width of the clutch groove 61 on the telescopic rod 6 is limited, and if the clutch notches 62 are formed on both sides of the clutch groove 61, the clutch hooks on the nut 8 do not have enough deformation space.

It should be noted that, when the telescopic rod 6 is subjected to an axial force, the clutch hook on the nut 8 tends to disengage from the clutch notch 62 on the telescopic rod 6, and because the clutch slot 61 needs to be opened longer due to the design, and the clutch notch 62 is disposed at a substantially middle position of the clutch slot 61, the solid structures on both sides of the clutch slot 61 on the telescopic rod 6 are relatively easy to open outwards, so that the upper limit setting of the threshold value of the clutch force is affected, the nut 8 and the telescopic rod 6 are very easy to disengage, and the driving force for opening the door of the refrigerator is lost.

Based on the above problems, the present embodiment employs the nut 8 having the following structure:

specifically, the nut 8 includes a nut inner collar 82, a nut outer collar 81, and a nut guide rib 83 provided between the nut inner collar 82 and the nut outer collar 81; wherein the nut inner hoop 82 is provided with an internal thread which is suitable for being in screw fit with the screw 9; the clutch hook is convexly arranged on one axial end of the nut guide rib 83; the part of the telescopic rod 6 provided with the engaging groove 61 is inserted between the holes formed by the nut inner hoop 82 and the nut outer hoop 81. Therefore, the telescopic rod 6 close to the clutch hook is coated by the nut outer hoop 81, when the telescopic rod 6 bears the axial force, the outward opening trend of the slotted part of the telescopic rod 6 caused by the relative separation trend between the clutch hook on the nut 8 and the clutch notch 62 on the telescopic rod 6 is limited, and the separation and the connection of the clutch can be realized only by the deformation of the clutch hook. Therefore, the upper limit of the threshold value of the clutch structure can be designed to be high enough, and the requirement of the driving force for opening the door of the refrigerator is met.

In summary, for the nut 8 adopted in the embodiment, the nut inner hoop 82, the nut outer hoop 81 and the hole structure which is provided between the nut inner hoop 82 and the nut outer hoop 81 and is suitable for the telescopic rod 6 to pass through are adopted, so that the nut 8 can be assembled with the telescopic rod 6 and the screw 9 at the same time, other assembling structures do not need to be additionally adopted, the overall structure is simplified, the production cost can be reduced, and the assembling and disassembling difficulty can be reduced. In addition, to playing the nut direction muscle 83 with the connection between the outer hoop 81 of nut 82 and the nut in this embodiment, nut direction muscle 83 has still played the fixed action to the separation and reunion trip, and nut direction muscle 83 has still played in addition after nut 8 and the assembly of telescopic link 6 supplementary counterpoint effect between separation and reunion trip and the separation and reunion groove 61, promptly at the in-process of nut 8 and the assembly of telescopic link 6, nut direction muscle 83 enters into the separation and reunion groove 61 just, under this condition, the separation and reunion trip that links firmly with nut direction muscle 83 can enter into the separation and reunion groove 61 naturally promptly, to holistic assembling process, assemble convenient high-efficient.

On the basis of the above structure, it should be further noted that the clutch hook adopted in the present embodiment includes a body 84 adapted to be embedded in the clutch groove 61, and a boss portion 85 and a support portion 86 integrally formed on the body 84; wherein the boss portion 85 is adapted to engage the clutch gap 62. In more detail, the boss portion 85 is provided with a first clutch surface 87 and a second clutch surface 88. Because the single-side clutch hook adopted in the present embodiment can resist deformation only depending on the strength of the material itself, the clutch hook of the present embodiment includes the supporting portion 86, for example, in an optional implementation case, the supporting portion 86 is an arc-shaped structural body; and the support portion 86 has a sliding support surface 89 thereon adapted to be in sliding contact with the other of the clutch grooves 61 opposed to the groove wall provided with the clutch gap 62. When the telescopic rod 6 is subjected to an external force and the boss portion 85 of the nut 8 is disengaged from the engaging and disengaging notch 62 of the telescopic rod 6, the support portion 86 can play an additional role of resisting deformation. In summary, through the cooperation of the boss 85 and the support 86, the clutch hook of the present embodiment can meet the connection and disconnection between the clutch notch 62 in the clutch groove 61 through deformation, and can prevent the problem of influence on the service life due to excessive deformation, thereby improving the usability of the overall clutch hook.

It should be noted that, in general, in a refrigerator with an automatic door opening and closing function, the probability that a user intervenes in the automatic door opening and closing process by hand is not high, but is not low. Especially the stage of opening the door, because the refrigerator factory need guarantee the smooth steady of switch door action, the action time of opening the door generally can set up about 5 seconds, and whole action is comparatively level and smooth like this, has both avoided the too fast production impact of the speed of opening the door to cause the object of placing on the door body to rock, avoids the too fast safe risk who strikes the user of the too fast striking of door body again, can also reduce the whole power demand of switch door subassembly simultaneously. However, in the door opening stage, the user gives a feeling of not fast response from giving a door opening instruction to completely opening and stopping the refrigerator door, and some users may wait, but some users may be impatient to pull the refrigerator door body 2 open at a high speed manually, and at this time, the clutch system needs to be enabled to take effect easily. There is also a case that when the refrigerator door 2 is automatically closed, a user suddenly thinks that something needs to be taken and put, the first reaction is to open the refrigerator door, and the clutch system is needed to be effective easily. In another case, the user's hand is pinched and protected from pinching, which also requires the clutch system to be easily activated. In summary, the clutch system of this disclosure needs to have a characteristic that the clutch system can be easily activated when the refrigerator door is driven to open by external force (not a self-contained door opening and closing system). Therefore, the first clutch surface 87 and the second clutch surface 88 on the boss portion 85 provided on the clutch hook of the nut 8 have the following characteristics: the first clutch surface 87 is arranged on one side of the boss part 85 facing the movable end of the telescopic rod 6, and the second clutch surface 88 is arranged on one side of the boss part 85 facing the fixed end of the telescopic rod 6; a first clutch included angle M formed by the first clutch surface 87 and the groove surface of the clutch groove 61 is smaller than a second clutch included angle N formed by the second clutch surface 88 and the groove surface of the clutch groove 61, and the second clutch included angle N is larger than 90 °.

It should be noted that, in the present embodiment, the clutch notch 62 on the telescopic rod 6 is disposed at the substantially middle position of the clutch slot 61, so that the telescopic rod 6 can be automatically engaged and reset within one movement cycle of the nut 8 when being pushed or pulled to engage and disengage in two directions.

Referring to fig. 16, in an initial state of the refrigerator being closed, when the refrigerator door 2 is forced to open by an external force, the nut 8 is not changed in position and the telescopic rod 6 is pulled out, the boss portion 85 of the nut 8 is disengaged from the clutch notch 62 of the telescopic rod 6, and at this time, the refrigerator door is in an external force door opening state (in the figure, the external force door opening state belongs to a door at a limit door opening angle). The refrigerator door body 2 is opened by means of position detection and other technical means, but the automatic door opening and closing mechanism does not operate, and the refrigerator door body 2 is still not closed after a period of time, so that the automatic door opening and closing mechanism starts to be started, the nut 8 moves forwards, when the nut 8 operates to the limit length, because the refrigerator door body 2 has limit angle limit, no matter what opening angle the refrigerator door body 2 is in before, the nut 8 in the figure 16 is finally changed into the advancing state, then the nut 8 retreats backwards, at the moment, the boss part 85 of the nut 8 is jointed with the clutch notch 62 of the telescopic rod 6 again, the refrigerator door body 2 is brought back to be closed from the opening state, and the retreating state of the nut 8 is achieved. Even if the user opens the refrigerator again in the closing process of the refrigerator door body 2 or foreign matters are clamped between the refrigerator door body 2 and the refrigerator main body 1, the refrigerator can enter the external force door opening state again, and then the refrigerator can be closed again or alarm prompt and other actions can be performed by the control logic of a refrigerator factory.

Referring to fig. 17, in an initial state of closing the refrigerator, when the refrigerator receives an opening instruction, the nut 8 drives the telescopic rod 6 to move forward to open the refrigerator door 2, and when the refrigerator door 2 is opened to a limit angle, the refrigerator door enters a door opening state. When the refrigerator door body 2 is opened, or after the door body is opened to a limit angle, the refrigerator door body 2 is forcibly closed by external force, the boss part 85 on the nut 8 is separated from the clutch notch 62 of the telescopic rod 6, and finally, the external force door closing state is achieved, namely, the telescopic rod 6 is at the original position, and the nut 8 is at the position of the normal door opening state. Then, the automatic door opening and closing mechanism can drive the nut 8 to start to retreat, and the refrigerator door opening and closing system enters the second half of a normal working cycle until the refrigerator door opening and closing system enters a retreat state of the nut 8. If the refrigerator door 2 is not completely closed by external force in the door opening state, in the retraction process of the nut 8, either the telescopic rod 6 reaches the closed state first under the friction action of the nut 8, then the nut 8 returns to the original position to be jointed with the telescopic rod 6 again, or the nut 8 is jointed with the telescopic rod 6 first and then returns to the original state under the driving of the nut 8.

As can be seen from the above description of the process, the clutch notch 62 on the telescopic rod 6 is disposed at the approximate middle of the clutch slot 61, so that no influence is caused on the motion process of the automatic door opening and closing mechanism in the door opening and closing process of the refrigerator, and the automatic door opening and closing mechanism can be returned to the initial state in one motion cycle.

Furthermore, the telescopic driving assembly of the present embodiment further comprises a guide tube 7 rotatably connected with the refrigerator body through a housing 27; the guide pipe 7 is sleeved on the outer side of the telescopic rod which is matched with the nut 8; the inner wall of the guide tube 7 is provided with guide grooves adapted to cooperate with the nut guide ribs 83. That is, the nut guide rib 83 of the present embodiment includes not only the portion disposed between the nut outer collar 81 and the nut inner collar 82, but also the extension portion provided on the outer surface of the nut outer collar 81 corresponding to the nut guide rib 83, so that the guide groove on the guide tube 7 cooperates with the extension portion of the nut guide rib 83 to cause the problem of fitting positioning between the guide tube 7 and the nut 8. Here, the engagement between the guide groove and the extension of the nut guide rib 83 also serves as a restriction to the movement path of the nut 8, thereby ensuring that the nut 8 is only reciprocally translated in the axial direction of the guide tube 7 by the screw 9, and does not rotate relative to the guide tube 7. To sum up, to the nut 8 of this embodiment, can play the assembly problem of being convenient for and between telescopic link 6, screw 9 and the stand pipe 7 simultaneously through its whole ingenious structure, greatly simplified holistic flexible drive assembly's structure, improve the convenience and the high efficiency of assembly.

In addition, the end part of the telescopic rod far away from the movable end of the telescopic rod 6 is provided with a sealing end cover 20; the sealing end cover 20 is provided with a sealing thread 201 and a sealing outer hoop 203; a locking thread 63 suitable for being matched and connected with the sealing thread 201 is arranged on the inner pipe wall of one end of the telescopic rod 6, which is far away from the movable end of the telescopic rod; and a bush 19 is sleeved on the telescopic rod 6 and positioned between the nut 8 and the sealing end cover 20.

Example 2:

referring to fig. 18 to 21, on the basis of the automatic door opening and closing mechanism of embodiment 1, the automatic door opening and closing mechanism of the present embodiment further includes a transmission clutch assembly disposed between the screw 9 and the power source, so that the automatic door opening and closing mechanism can be switched between transmission engagement and disengagement before being started.

For example, in an alternative implementation, the transmission clutch assembly adopted in the present embodiment includes a helical gear 18 sleeved on the screw 9, a clutch engaging member 24, and a clutch driving member 25 rotatably sleeved and matched with the clutch engaging member 24; wherein the bevel gear 18 is connected with a power source to transmit torque, and the optional power source motor 5 is meshed with the bevel gear 18 through the worm 17 to transmit power; the helical gear 18 is axially matched and connected with the clutch combination part so as to transmit the torque transmitted by the end of the helical gear 18 to the screw 9; an electromagnet 23 is connected to the clutch driving member 25 and is adapted to drive the clutch driving member 25 to move axially.

More specifically, the clutch engaging member 24 is provided with a concave-convex engaging portion on an axial end face thereof, and a corresponding concave-convex engaging portion is provided on an axial end face of the helical gear 18, so that torque can be transmitted after both are axially engaged. The clutch engagement member 24 is engaged with the drive pin 21 provided on the screw 9, and can transmit the torque transmitted from the helical gear 18 end to the screw 9. The electromagnet 23 drives the clutch driving component 25 to drive the clutch engaging component 24 to move axially, so that the transmission clutch component is switched between engagement and disengagement.

In detail, referring to the drawings, the clutch driving member 25 and the clutch engaging member 24 are rotatably sleeved, the stationary plate 22 and the clutch engaging member 24 are fixedly connected, and a gap for the clutch driving member 25 to rotate relative to the stationary plate is reserved between the stationary plate and the clutch engaging member 24. One end of the clutch joint 24 is suitable for being in plug-in fit with the bevel gear 18, the fixing plate 22 is sleeved on the part of the clutch joint 24 far away from one end of the bevel gear 18, and the part of the clutch driving part 25 and the clutch joint 24 is located between the fixing plate 22 and the part of the clutch joint 24 suitable for being in plug-in fit with the bevel gear 18. The clutch driving member 25 can drive the clutch engaging member 24 to move back and forth along the axial direction of the screw 9 under the driving of the electromagnet 23. When the electromagnet 23 is energized, the clutching engagement member 24 is driven to be inserted into the helical gear 18, and when the electromagnet 23 is de-energized, a mechanical reset element (such as, but not limited to, a spring provided between the helical gear 18 and the clutching engagement member) drives the clutching engagement member 24 to be disengaged from the helical gear 18.

In the present embodiment, the inner copying portion 242 penetrating the center of the clutch engaging member 24 enables the torque to be transmitted to the screw 9 through the drive pin 21 even when the clutch engaging member 24 moves axially on the screw 9 within a certain range. The helical gear 18 is provided with a matching hole 181, and when the clutch joint part 24 is driven and the outer copying part 241 is inserted into the matching hole, the torque on the helical gear 18 can be transmitted to the screw 9. In this case, the clutch driving member 25 is provided with a circular inner circumferential surface so that when the helical gear 18 rotates, the clutch driving member 25 and the clutch engaging member 24 rotate around the center of the screw 9.

Example 3:

on the basis of the automatic door opening and closing mechanism of embodiment 1 or embodiment 2, the present embodiment provides a refrigerator including the automatic door opening and closing mechanism of embodiment 1 or embodiment 2.

The above embodiments are provided to further explain the objects, technical solutions and advantages of the present invention in detail, it should be understood that the above embodiments are only examples of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms indicating an orientation or positional relationship are based on the orientation or positional relationship shown in the drawings only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the present invention, unless otherwise expressly stated or limited, the first feature may be present on or under the second feature in direct contact with the first and second feature, or may be present in the first and second feature not in direct contact but in contact with another feature between them. Also, the first feature being above, on or above the second feature includes the first feature being directly above and obliquely above the second feature, or merely means that the first feature is at a higher level than the second feature. A first feature that underlies, and underlies a second feature includes a first feature that is directly under and obliquely under a second feature, or simply means that the first feature is at a lesser level than the second feature.

Claims (11)

1. An automatic door opening and closing mechanism suitable for a refrigerator, comprising:

a power source capable of outputting power in a forward and reverse rotation manner;

the telescopic driving component is suitable for driving the refrigerator door body to open and close relative to the refrigerator body; the telescopic driving assembly comprises a screw rod in transmission connection with a power source, a nut in transmission connection with the screw rod, and a telescopic rod matched and connected with the nut; wherein

The telescopic rod is provided with a clutch groove, and the nut is provided with a clutch hook suitable for being embedded into the clutch groove; a clutch notch is formed in the clutch groove; and the clutch notch and the clutch hook are suitable for forming a connection state and a disconnection state.

2. The automatic door opening and closing mechanism according to claim 1, wherein the clutch groove is formed in an outer wall surface of the telescopic rod, and the clutch groove is arranged in an axial direction parallel to the telescopic rod; and

the outer wall surface of the telescopic rod is provided with at least one clutch groove.

3. The automatic door opening and closing mechanism according to claim 2, wherein a clutch gap is provided on one of the groove walls of each clutch groove;

and the clutch notch is arranged at the middle position or the approximate middle position of the clutch groove.

4. The automatic door opening and closing mechanism according to any one of claims 2 or 3, wherein the clutch hook includes a body adapted to be inserted into the clutch groove, and a boss portion and a support portion integrally formed on the body; wherein

The boss part is suitable for being matched with the clutch notch;

the boss part is provided with a first clutch surface and a second clutch surface.

5. The automatic door opening and closing mechanism according to claim 4, wherein the support portion is an arc-shaped structural body; and

the support part is provided with a sliding support surface which is suitable for sliding contact with the other groove wall opposite to the groove wall provided with the clutch gap in the clutch groove.

6. The automatic door opening and closing mechanism according to claim 1, wherein the nut includes a nut inner collar, a nut outer collar, and a nut guide rib provided between the nut inner collar and the nut outer collar; wherein

The nut inner hoop is provided with an inner thread which is suitable for being in spiral connection with the screw rod;

the clutch hook is convexly arranged on one axial end of the nut guide rib;

the part of the telescopic rod, which is provided with the clutch groove, is inserted between the holes formed by the nut inner hoop and the nut outer hoop.

7. The automatic door opening and closing mechanism according to claim 6, wherein said telescopic driving assembly further comprises a guide tube rotatably connected to the refrigerator body through the housing; and

the guide pipe is sleeved outside the telescopic rod matched with the nut;

the inner wall of the guide pipe is provided with a guide groove suitable for being matched with the nut guide rib.

8. The automatic door opening and closing mechanism according to claim 4, wherein the first clutch surface is provided on a side of the boss portion facing the movable end of the telescopic rod, and the second clutch surface is provided on a side of the boss portion facing the fixed end of the telescopic rod;

and a first clutch included angle formed by the first clutch surface and the groove surface of the clutch groove is smaller than a second clutch included angle formed by the second clutch surface and the groove surface of the clutch groove, and the second clutch included angle is larger than 90 degrees.

9. The automatic door opening and closing mechanism according to claim 1, wherein a sealing end cover is arranged at the end part of the telescopic rod far away from the movable end of the telescopic rod;

the sealing end cover is provided with a sealing thread and a sealing outer hoop; the inner pipe wall of one end of the telescopic rod, which is far away from the movable end of the telescopic rod for covering the telescopic rod, is provided with locking threads suitable for being matched and connected with the sealing threads; and

and a bush is sleeved on the telescopic rod and positioned between the nut and the sealing end cover.

10. The automatic door opening and closing mechanism according to claim 1, further comprising a transmission clutch assembly provided between the screw and a power source;

the transmission clutch assembly comprises a helical gear sleeved on the screw, a clutch joint part and a clutch driving part which is rotatably sleeved and matched with the clutch joint part; wherein

The bevel gear is connected with a power source to transmit torque; the helical gear is axially matched and connected with the clutch combination part so as to transmit the torque transmitted by the end of the helical gear to the screw rod;

the clutch driving component is connected with an electromagnet which is suitable for driving the clutch driving component to move axially.

11. A refrigerator, characterized by comprising: an automatic door opening and closing mechanism according to any one of claims 1 to 10.

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