阅读说明：本技术 一种冰箱 (A kind of refrigerator ) 是由 郭子豪 王仁华 陈红欣 申乃雨 朱建高 于 2019-03-11 设计创作，主要内容包括：本发明公开一种冰箱,所述储藏室内设有可调层架以及驱动所述可调层架上下移动的层架驱动机构,所述层架驱动机构包括：固定于所述储藏室内的导轨；支撑件,所述可调层架与所述支撑件固定连接,所述支撑件可沿所述导轨滑动；驱动电机,所述驱动电机的输出轴上缠绕有牵引绳,所述牵引绳的另一端与所述支撑件固定,所述驱动电机通过所述牵引绳带动所述支撑件沿所述导轨上下移动；还包括遇阻急停装置,所述遇阻急停装置用于在所述可调层架上升或下降时遇到阻力时控制所述驱动电机停机。本发明的层架可自动升降方便用户存放不同高度的食材,同时由于该层架驱动机构可以可调层架上升或下降时遇到阻力时控制电机停止,安全系数较高。(The invention discloses a refrigerator, an adjustable shelf and a shelf driving mechanism for driving the adjustable shelf to move up and down are arranged in a storage room, and the shelf driving mechanism comprises: a guide rail fixed in the storage chamber; the adjustable shelf is fixedly connected with the supporting piece, and the supporting piece can slide along the guide rail; a traction rope is wound on an output shaft of the driving motor, the other end of the traction rope is fixed with the supporting piece, and the driving motor drives the supporting piece to move up and down along the guide rail through the traction rope; the emergency stop device is used for controlling the driving motor to stop when the adjustable shelf ascends or descends and meets resistance. The shelf can be automatically lifted, so that a user can conveniently store food materials with different heights, and meanwhile, the shelf driving mechanism can control the motor to stop when the shelf meets resistance when ascending or descending, so that the safety coefficient is higher.)

1. A refrigerator comprises a storage chamber, wherein an adjustable shelf and a shelf driving mechanism for driving the adjustable shelf to move up and down are arranged in the storage chamber, and the shelf driving mechanism comprises: a guide rail fixed in the storage chamber; the adjustable shelf is fixedly connected with the supporting piece, and the supporting piece can slide along the guide rail; the driving motor is positioned on the upper side of the supporting piece, a traction rope is wound on an output shaft of the driving motor, the other end of the traction rope is fixed with the supporting piece, and the driving motor drives the supporting piece to move up and down along the guide rail;

the emergency stop device is used for controlling the driving motor to stop when the adjustable shelf ascends or descends and meets resistance.

2. The refrigerator according to claim 1, wherein: the side wall of the storage chamber is provided with a layer frame lifting control button, the layer frame lifting control button comprises a lifting button, a descending button and a stopping button, and the layer frame lifting control button controls the driving motor to rotate forwards, reversely or stop.

3. The refrigerator according to claim 1 or 2, characterized in that: the emergency stop device comprises an upward emergency stop device, the upward emergency stop device comprises a current sensor for detecting the current of the driving motor, and the current sensor controls the driving motor to stop when detecting sudden change of the current.

4. The refrigerator according to claim 1 or 2, characterized in that: the emergency stop device comprises a downward emergency stop device, the downward emergency stop device comprises a microswitch electrically connected with the driving motor, a detection arm of the microswitch is sleeved on the traction rope, and the change of the position of the traction rope controls the microswitch to be disconnected so as to control the driving motor to stop.

5. The refrigerator of claim 4, wherein: the two guide rails are respectively positioned at two opposite sides of the storage chamber, the driving motor is arranged on the rear wall of the storage chamber, and a first pulley is fixed on an output shaft of the driving motor; the left side and the right side of the storage room are respectively provided with a second pulley for converting the traction direction of the traction ropes, one end of each of the two traction ropes is fixed on the first pulley, the middle positions of the two traction ropes pass around the second pulleys respectively, and the other ends of the traction ropes are fixed on the supporting piece respectively.

6. The refrigerator according to claim 5, wherein: the downward emergency stop device comprises a reversing device, wherein the reversing device comprises a power reversing chip, a microswitch, a diode and a driving motor which are electrically connected; the power supply reversing chip is used for switching the polarity of the output end according to signal input information, the micro switch comprises a first micro switch and a second micro switch which are respectively positioned on the traction ropes on two sides, the first micro switch and the second micro switch are connected in series and then connected in parallel with the diode, and then connected in series with the driving motor to the two output ends of the power supply reversing chip.

7. The refrigerator according to claim 1, wherein: the adjustable shelf stroke control device comprises a position sensor for detecting the moving position of the adjustable shelf and is used for detecting the position information of the adjustable shelf, wherein the position information of the adjustable shelf comprises the highest position of the adjustable shelf and the lowest position of the adjustable shelf; and when the position information detected by the position sensor is the highest position or the lowest position information, the controller controls the driving motor to stop.

8. The refrigerator according to claim 7, wherein: the position sensor comprises an induction trigger arranged on the adjustable shelf, and an uppermost induction point and a lowermost induction point which are respectively arranged on the storage room.

9. The refrigerator according to claim 1, wherein: the guide rail is a steel ball slide rail which comprises an outer rail, an inner rail and a ball positioned between the outer rail and the inner rail; the outer rail is fixed on the side wall of the storage chamber, the supporting piece is fixedly connected with the inner rail, the adjustable shelf comprises a shelf body and a shelf supporting frame for supporting the shelf body, the shelf supporting frame is fixedly connected to two sides of the lower part of the shelf body, and a hook is arranged on the rear side of the partition supporting frame; the support piece is provided with a hanging hole, and the hook of the clapboard support frame is hooked on the hanging hole of the support piece.

10. The refrigerator according to claim 1, wherein: the adjustable shelf is arranged on the inner side of the opening in a penetrating manner and is connected with the supporting piece; the air duct assembly comprises an air duct cover plate and air duct foam, one end of the decorative plate is fixed in the guide rail installation groove, the other end of the decorative plate is fixed on the rear wall of the storage chamber, and part of the plate surface of the decorative plate is positioned on the rear side of the air duct cover plate; the decorative plate is provided with an air guide surface at the air outlet position of the air duct assembly and used for guiding the air outlet direction of the air duct assembly; the driving motor and the upper half part of the traction rope are positioned on the rear side of the air duct cover plate.

Technical Field

The invention relates to the field of intelligent household appliances, in particular to a refrigerator with a shelf capable of automatically lifting.

Background

With the increasing improvement of life quality, the occupancy rate of the multi-door refrigerator with the characteristics of large volume, multiple functions, classified storage and the like gradually increases, and the intelligent requirement degree of the refrigerator products by people is higher and higher.

The layer frame of current refrigerator product is mostly the unchangeable layer frame of fixed position, usually at the relative both sides shaping courage muscle of refrigerator inner bag, the layer frame place on the courage muscle can. In order to facilitate adjustment of a user, a plurality of liner ribs are reserved for adjusting the position of the shelf in the design of the refrigerator. However, the height between the shelves cannot adapt to the placement of articles with different volumes, the storage space has certain limitation, the space utilization rate in the refrigerator is low, and a lot of foods with larger volumes cannot be placed, so that the user experience is influenced. In addition, in recent years, the demand for large-capacity refrigerators has increased, and the height of the refrigerators has tended to increase, so that it is difficult to take articles from the shelves at the uppermost layer of the refrigerator, which is a problem for users.

In order to solve the above technical problems, the prior art provides an automatic lifting shelf structure, as shown in fig. 1 and 2, a mechanism for driving the shelf to lift comprises a screw 33 and a nut 34, and a power part drives the screw 33 to rotate to realize that the nut 34 moves up and down linearly; the nut 34 is coupled to the housing 321 of the slider assembly 32 to move the slider assembly 32 up and down along the guide rail 31. The power part comprises a motor 35, a first rotating shaft 38 and a second rotating shaft 39, an output shaft of the motor 35 is connected with the first rotating shaft 38 through a belt 36 to drive the first rotating shaft 38 to rotate, and one side of the first rotating shaft 38 transmits rotary motion to the screw rods 33 of the group of lifting mechanisms through a worm and gear pair speed reducing mechanism. The automatic lifting device of the shelf drives the worm gear mechanism and the lead screw nut mechanism to be converted into linear motion through the motor, the structure is complex, the worm gear mechanism and the lead screw nut mechanism occupy large space, and the effective storage space of a storage chamber is influenced; meanwhile, when the mechanism meets resistance when the layer frame moves, the motor cannot be controlled to stop, and the mechanism has great potential safety hazard.

Disclosure of Invention

The invention aims to solve the technical problem that the adjustable shelf of the existing refrigerator occupies a large space. Therefore, the refrigerator provided by the invention has the advantages of smaller occupied space and higher safety coefficient.

In order to solve the technical problems, the invention provides the following technical scheme:

a refrigerator comprises a storage chamber, wherein an adjustable shelf and a shelf driving mechanism for driving the adjustable shelf to move up and down are arranged in the storage chamber, and the shelf driving mechanism comprises: a guide rail fixed in the storage chamber; the adjustable shelf is fixedly connected with the supporting piece, and the supporting piece can slide along the guide rail; a traction rope is wound on an output shaft of the driving motor, the other end of the traction rope is fixed with the supporting piece, and the driving motor drives the supporting piece to move up and down along the guide rail through the traction rope; the emergency stop device is used for controlling the driving motor to stop when the adjustable shelf ascends or descends and meets resistance.

Compared with the prior art, the technical scheme of the invention has the following technical effects:

the refrigerator is provided with the shelf and the shelf driving mechanism, the shelf can move up and down under the driving of the shelf driving mechanism, and a user can store food materials with different heights conveniently. The shelf driving mechanism comprises a guide rail and a supporting piece which can be connected to the guide rail in a sliding manner, and the shelf is fixedly connected with the supporting piece; the driving motor drives the supporting piece to move up and down along the guide rail through the traction rope. Because the transmission mode of the layer frame driving mechanism adopts the traction mode of the traction rope, compared with the mode that the traditional worm gear mechanism and the screw nut mechanism are converted into linear motion, the layer frame driving mechanism has simple structure and small occupied space. Meanwhile, the emergency stop device is arranged and used for controlling the driving motor to stop when the adjustable shelf rises or falls and meets resistance, so that the safety of the whole device is improved.

Drawings

The objects and advantages of the present invention will be understood by the following detailed description of the preferred embodiments of the invention, taken in conjunction with the accompanying drawings, in which:

FIG. 1 is a prior art refrigerator with an automatic lifting shelf;

FIG. 2 is a schematic view of a driving mechanism of an automatic lifting/lowering shelf in the prior art;

FIG. 3 is a perspective view of the refrigerator having an automatic elevating shelf according to the present invention;

FIG. 4 is a schematic perspective view of the adjustable shelf drive mechanism of the present invention;

FIG. 5 is a schematic view illustrating an installation structure of a driving motor in one embodiment of a refrigerator according to the present invention;

FIG. 6 is a schematic view of a structure of a guide rail in one embodiment of a refrigerator according to the present invention;

FIG. 7 is a schematic structural diagram of an adjustable shelf in an embodiment of a refrigerator according to the present invention;

FIG. 8 is a view illustrating a connection relationship between an adjustable shelf and a support member according to an embodiment of the refrigerator of the present invention;

FIG. 9 is a schematic view of the present invention in a normal operating condition of a racking mechanism having an emergency stop upon encountering a jam;

FIG. 10 is a schematic view of a rack drive mechanism having an emergency stop device in the event of a rack encounter in accordance with the present invention;

FIG. 11 is a schematic diagram of a power supply commutation signal with a distress emergency stop arrangement according to the present invention;

FIG. 12 is a schematic view of the adjustable shelf of the refrigerator according to the present invention ascending to the highest position;

FIG. 13 is a schematic view of the refrigerator of the present invention in which the shelves are lowered to the lowest position;

fig. 14 is a sectional view of a refrigerating chamber in a horizontal direction in an embodiment of the refrigerator in accordance with the present invention;

fig. 15 is another sectional view of the refrigerating chamber in a horizontal direction in an embodiment of the refrigerator in accordance with the present invention;

fig. 16 is a perspective view of a decorative panel in an embodiment of a refrigerator according to the present invention.

The reference numbers in the figures are:

100-storage chamber, 100A-freezing chamber, 100B-refrigerating chamber, 200-door body, 200A-freezing chamber door and 200B-refrigerating chamber door body;

101-storage drawers, 102-fixed shelves 103-adjustable shelves, 1031-shelf bodies, 1032-shelf support frames, 1033-hooks, 104-motor reinforcing iron, 105-guide rail reinforcing iron, 106-motor installation grooves, 107-guide rail installation grooves, 108-shelf lifting control buttons,

300-layer frame driving mechanism, 301-guide rail, 3011-outer rail, 3012-inner rail, 3013-ball, 302-supporting piece, 3021-hanging hole 303-driving motor, 3031-output shaft, 304-traction rope, 305-first pulley, 3051-shaft sleeve body, 3052-baffle plate, 306-second pulley, 307-traction rope fixing piece and 308-travel switch;

401-air duct cover plate, 402-air outlet

501-decorative plate, 5011-opening,

601-a microswitch, 6011-a detection arm, 6012-an annular sleeve, 601A-a first microswitch, 601B-a second microswitch, 602-a power supply reversing chip and 603-a diode.

Detailed Description

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

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, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

FIG. 3 is a perspective view of one embodiment of the refrigerator of the present invention; referring to fig. 3, the refrigerator 1 of the present embodiment has an approximately rectangular parallelepiped shape. The refrigerator 1 has an external appearance defined by a storage chamber 100 defining a storage space and a plurality of door bodies 200 provided in the storage chamber 100, the storage chamber 100 having an open cabinet formed of a storage chamber inner, a storage chamber outer, and a foaming layer therebetween. The storage compartment 100 is vertically partitioned into a lower freezing compartment 100A and an upper refrigerating compartment 100B. Each of the partitioned spaces may have an independent storage space.

In detail, the freezing compartment 100A is defined at a lower side of the storage compartment 100 and may be selectively covered by a drawer type freezing compartment door 200A. The space defined above the freezing compartment 100A is partitioned into left and right sides to define the refrigerating compartment 100B, respectively. The refrigerating compartment 100B may be selectively opened or closed by a refrigerating compartment door body 200B pivotably mounted on the refrigerating compartment 100B.

In the storage chamber 100 of the embodiment of the present invention, the storage drawer 101 is provided at the lower side, and the storage drawer is provided in two layers, and includes two dry and wet preservation drawers provided at the lower layer, and a wider storage drawer provided at the upper sides of the dry and wet preservation drawers and used for storing longer food materials; the storage compartment 100 also includes shelves located above the storage drawer 101; wherein, the shelf comprises a fixed shelf 102 and an adjustable shelf 103; the fixed shelves 102 are not vertically movable after being installed, and generally, a bladder rib is formed on both inner walls of the storage chamber 10, and the fixed shelves 102 are placed on the bladder rib. The adjustable shelf 103 is a shelf which can be adjusted up and down after installation, and specifically, the adjustable shelf 103 moves up and down under the driving of the shelf driving mechanism 300.

The relative position between the adjustable shelf 103 and the fixed shelf 102 is not unique, and the fixed shelf 102 may be located on the upper side, or the adjustable shelf 103 may be located on the upper side. Preferably, in this embodiment, the adjustable shelves 103 are located at the upper side, so that when the overall height of the refrigerator is high and a user cannot store food materials on the shelves at the uppermost layer, the user can move down to store food materials by adjusting the adjustable shelves 103, thereby facilitating the use of the user.

As shown in fig. 4 and 5, the shelf driving mechanism 300 includes: a rail 301 fixed in the storage chamber 100, a support 302 slidably connected to the rail 301, and the adjustable shelf 103 fixedly connected to the support 302; the lifting device further comprises a driving motor 303 for driving the support 302 to lift, an output shaft 3031 of the driving motor 303 is wound around a traction rope 304, and the other end of the traction rope 304 is connected with the support 302; when the adjustable shelf 103 needs to move downwards, an output shaft 3031 of the driving motor 303 is controlled to rotate towards a first direction, the traction rope 304 extends out, and the adjustable shelf 103 moves downwards under the action of gravity; when the adjustable shelf 103 needs to move upwards, the output shaft of the driving motor 303 is controlled to rotate towards the second direction (opposite to the first direction), the traction rope 304 is wound gradually, and the adjustable shelf 103 moves upwards. Because the transmission mode of the layer frame driving mechanism adopts the traction mode of the traction rope, compared with the mode that the traditional worm gear mechanism and the screw nut mechanism are converted into linear motion, the layer frame driving mechanism has simple structure and small occupied space.

In order to facilitate the user to control the lifting of the adjustable shelves 103, as shown in fig. 3, a shelf lifting control button 108 is provided on a sidewall of the storage room 100, and the shelf lifting control button 108 controls the driving motor to rotate forward, backward, or stop.

Specifically, in one mode, the shelf lifting control button 108 includes three buttons, namely a lifting button, a lowering button and a stopping button; wherein the ascending button is positioned at the upper side and is provided with an upward arrow mark, the stopping button is positioned at the middle and is provided with a stopping mark, and the descending button is positioned at the lower side and is provided with a downward arrow mark. In another mode, the shelf lifting control button 108 includes two buttons, which are an ascending/stopping button and a descending/stopping button, respectively, and the ascending/stopping button is used for controlling the adjustable shelf 103 to ascend or stop ascending; the descending/stopping button is used for controlling the adjustable shelf 103 to descend or stop descending.

In one embodiment, in the shelf driving mechanism 300, one rail 301 and one supporting member 302 are provided, the rail 301 is mounted on a rear sidewall of the storage chamber 100, and the supporting member 302 is fixedly connected to a middle rear position of the adjustable shelf 103; the driving motor 303 is disposed on the upper side of the guide rail 301, and in this way, the traction distance of the traction rope 304 is short, the structure is simpler, and the production cost is low. However, in this embodiment, the adjustable shelf 103 is supported and fixed only at the middle position, and if the weight difference between the articles placed on both sides is large, the adjustable shelf 103 may be inclined.

In another embodiment, as shown in fig. 4, in order to move the adjustable shelf 103 up and down more stably, two guide rails 301 are provided, each of which is located at opposite sides of the storage chamber 100, the driving motor 303 is provided at the rear side of the storage chamber 100, and a first pulley 305 is fixed to an output shaft of the driving motor 303; second pulleys 306 for converting the traction direction of the traction ropes are respectively disposed at the left and right sides of the storage chamber 100, one ends of the two traction ropes 304 are respectively fixed to the first pulleys 305, the middle positions of the two traction ropes 304 respectively pass around the second pulleys 306, and the other ends of the traction ropes 304 are respectively fixed to the support member 302.

Specifically, as shown in fig. 5, the first pulley 305 includes a bushing body 3051 sleeved on the output shaft 3031 of the driving motor 303 and three radially extending blocking pieces 3052, and the pulling ropes 304 respectively pulling the left and right supporting members 302 are respectively spaced apart by the blocking pieces 3052.

Specifically, as shown in fig. 6, the guide rail 301 is selected as a steel ball slide rail, and the steel ball slide rail includes an outer rail 3011, an inner rail 3012, and a ball 3013 located therebetween; the outer rail 3011 is fixed to a sidewall of the storage compartment 100, and the support 302 is fixedly connected to the inner rail 3012. By adopting the steel ball slide rail, the adjustable shelf 103 can move up and down only by overcoming rolling friction, and under the same load, the adjustable shelf 103 can move up and down only by smaller driving force.

The fixing connection mode of the adjustable shelf 103 and the supporting part 302 is not exclusive, and the adjustable shelf can be fixed by threads or can be connected by a buckle. Specifically, as shown in fig. 7, in the present embodiment, the adjustable shelf 103 includes a shelf body 1031 and shelf support frames 1032 for supporting the shelf body 1031, the shelf support frames 1032 are fixedly connected to both sides of the lower portion of the shelf body 1031, and hooks 1033 are provided at the rear side of the shelf support frames 1032; the supporting member 302 is provided with a hanging hole 3021, and as shown in fig. 8, the hook 1033 of the partition supporting frame 1032 is hooked on the hanging hole 3021 of the supporting member 302. The hooking mode has high reliability, and is convenient for a user to disassemble and clean the adjustable shelf 103.

The support 302 is connected to the pulling string 304 in a non-exclusive manner, and in one embodiment, a connecting hole is formed on the upper side of the support 302, and the pulling string 304 is directly connected to the connecting hole. In this way, the support 302 fixes the adjustable shelf 103 and the pulling rope 304 at the same time, and the requirement on the self-supporting capability is high. Therefore, in this embodiment, as shown in fig. 8, preferably, the upper side of the support member 302 is provided with a pull rope fixing member 307, and the pull rope fixing member 307 is fixedly connected to the inner rail 3012. The pull rope fixing part 307 and the support part 302 are independent of each other, and respectively support the adjustable layer frame 103 and the pull rope 304, so that the support performance is easy to guarantee, and the manufacture and the assembly are easy.

In the up-and-down moving process of the adjustable shelf 103, articles may block the adjustable shelf 103, and at this time, the adjustable shelf 103 needs to be stopped immediately to continue moving, so as to avoid the articles on the adjustable shelf 103 from toppling over due to the deflection of one side of the adjustable shelf 103. Therefore, the layer rack driving mechanism 300 further comprises a stop-and-emergency device for controlling the driving motor to stop when the adjustable layer rack meets resistance when ascending or descending. In order to ensure the safety of the upward and downward movement of the adjustable shelving unit 103, the emergency stop device comprises a downward emergency stop device and an upward emergency stop device, the downward emergency stop device is used for ensuring that the adjustable shelving unit 103 stops moving downward when meeting the article blocking condition when moving downward, and the upward emergency stop device is used for ensuring that the adjustable shelving unit 103 stops moving upward when meeting the article blocking condition when moving upward. Specifically, the upward emergency stop device is realized by detecting the current of the driving motor 303, specifically, a current sensor for detecting the current is arranged on the driving motor 303, when the adjustable shelf 103 moves upward or downward and meets resistance, the current of the driving motor 303 changes suddenly, and at this time, the controller controls the driving motor to stop running.

As shown in fig. 9 and 10, the downward emergency stop device includes a micro switch 601, the micro switch 601 is fixed on the rear wall of the refrigerating chamber 100B, an annular sleeve 6012 is disposed on a detection arm 6011 of the micro switch 601, and is sleeved on the traction rope 304, preferably, the annular sleeve 6012 is sleeved on the traction rope section between the first pulley 305 and the second pulley 306, the traction rope 304 is in a normal state, as shown in fig. 9, due to the gravity of the adjustable layer rack 103 being in a tensioned state, the detection arm 6011 of the micro switch 601 keeps consistent position in a normal working state, the circuit is in a normally closed state, when the adjustable layer rack 103 is blocked by an obstacle during descending, as shown in fig. 10, the traction rope 304 is changed from the tensioned state to a relaxed state, at this time, the detection arm 6011 of the micro switch 601 changes position, when the normally closed state is changed into the normally open state, the control unit cuts off the circuit, the driving motor 303 stops rotating, and the adjustable shelf 103 stops descending. Because the position of the traction rope can be changed immediately when the traction rope meets an obstacle, the response speed can be increased by detecting the position of the traction rope 304 through the microswitch 601, and the detection reliability is improved.

FIG. 11 is a schematic diagram of a power supply commutation signal for the emergency stop device; the power supply reversing chip 602 is used for switching the polarity of an output end according to signal input information, a first micro switch 601A and a second micro switch 601B which are positioned on two sides of the traction rope 304 are connected in series with each other and then connected in parallel with a diode 603, and then connected in series with the driving motor 303 and then connected to two output ends of the power supply reversing chip 602, wherein the anode of the diode 603 is connected with the driving motor 303, and the cathode of the diode 603 is connected with the power supply reversing chip 602.

Specifically, the input end of the power supply commutation chip 602 includes a +24V power supply interface and a GND end connected to the positive electrode and the negative electrode of a 24V dc power supply, and a signal input end connected to an I/O port of the single chip microcomputer for sending out the commutation signal; two output ends of the power supply reversing chip are connected in series in a loop to provide power supply signals for the emergency stop device when encountering a resistance. When the signal input end receives a reversing signal sent by the singlechip, the polarities of the power supplies of the two output ends are exchanged up and down (for example, the upper end +24V and the lower end GND are changed into the upper end GND and the lower end + 24V).

When the adjustable shelf descends normally, the two output ends of the power supply reversing chip 602 are the upper end +24V and the lower end GND, the current direction in the loop is clockwise, the current flows through the first micro switch 601A and the second micro switch 601B on the two traction ropes 304 and then flows through the driving motor 303, and the driving motor 303 rotates to drive the adjustable shelf 103 to descend. At the moment, the adjustable shelf 103 is blocked by an obstacle in the descending process, so that the traction rope 304 becomes loose, one or two of the first microswitch 601A and the second microswitch 601B are disconnected, the original circuit is cut off, the driving motor 303 stops rotating, and the adjustable shelf 103 stops descending. At this time, the adjustable shelf 103 does not operate by pressing the down button again, but the adjustable shelf 103 can be raised by pressing the up button. When the up button is pressed, the single chip microcomputer receives the key information and then sends a power supply reversing signal to the power supply reversing chip 602 through the signal input end, and the power supplies at the two output ends of the power supply reversing chip 602 are reversed to be +24V at the lower end of the upper GND. At this time, the loop current becomes counterclockwise, the micro switch 601 (the first micro switch 601A and/or the second micro switch 601B) is turned off, but the current flows through the driving motor 303 and then is turned on through the diode 603, so that the driving motor 303 rotates in the reverse direction, and the adjustable shelf 103 rises. When the adjustable shelf 103 rises for a certain distance, the two micro switches 601A/601B restore the connection state, and the descending key restores the function, and free control of the rising and the descending of the shelf can be carried out through the rising key and the descending key.

Specifically, in order to further precisely control the moving position of the adjustable shelves 103, the refrigerator further includes a shelf stroke control device including position sensors 308 disposed on the inner wall of the rear side of the storage chamber 100 and the rear wall of the adjustable shelf 103, the position sensors 308 including induction triggers (not shown) disposed on the adjustable shelves 103, and highest and lowest position induction points (not shown) disposed on the storage chamber, respectively. The position sensor 308 is used for detecting the position information of the adjustable shelf 103. The position information of the adjustable shelf 103 comprises that the adjustable shelf 103 is at the highest position and the adjustable shelf 103 is at the lowest position; when the position information detected by the position sensor 308 is the highest position or the lowest position information, the controller controls the driving motor 303 to stop. . As shown in fig. 12, when the adjustable shelf 103 moves to a set highest position, the position sensor 308 is triggered, the controller controls the driving motor 303 to stop, at this time, the ascending button is disabled, and the descending button functions normally; as shown in fig. 13, when the adjustable shelf 103 moves to the lowest setting position, the position sensor 308 is triggered, the controller controls the driving motor 303 to stop, and at this time, the down button is disabled and the up button functions normally.

In order to further reduce the space occupied by the shelf driving mechanism 300 in the storage room 100, as shown in fig. 5, a motor mounting groove 106 is formed in the rear wall of the storage room 100, a motor reinforcing iron 104 is disposed inside the rear wall of the storage room 100, and the driving motor 303 mounted in the motor mounting groove 106 is connected to the motor reinforcing iron 104 by a bolt. As shown in fig. 14 and 15, rail mounting grooves 107 are formed in left and right sidewalls of the storage compartment 100, rail reinforcing irons 105 are provided inside the left and right sidewalls of the storage compartment 100, and the rails 301 mounted in the rail mounting grooves 107 are connected to the rail reinforcing irons 105 by bolts. In this way, the drive motor 303 and the guide rail 301, which are two larger parts of the layer rack drive mechanism 300, are embedded in the installation grooves on the inner side of the inner wall of the storage room, and the whole layer rack drive mechanism 300 occupies a small space.

In order to make the interior of the storage chamber 100 more beautiful and integral, the storage chamber further comprises a decorative structure covering the shelf driving mechanism 300, specifically, when the refrigerator is a direct-cooling refrigerator, and when the inner side of the storage chamber 100 is not provided with an air duct structure, an integral panel can be adopted to cover the area where the whole shelf driving mechanism 300 is located, openings are arranged on two sides of the panel, and the adjustable shelf 103 can move up and down along the openings.

In this embodiment, the refrigerator 1 is an air-cooled refrigerator, as shown in fig. 14 and 15, an air duct assembly is disposed on an inner wall of a rear side of the storage chamber 100, wherein the air duct assembly includes an air duct cover plate 401 and air duct foam (not shown in the figure), the air duct foam is located on the rear side of the air duct cover plate 401 and is connected to the rear wall of the refrigerating chamber through the air duct cover plate 401 in a snap-fit manner, an air duct structure is formed inside the air duct foam, a plurality of air outlets 402 are respectively disposed on two sides of the air duct foam, and the air duct assembly supplies air into the refrigerating chamber 100B through the plurality of air outlets 402.

The decorative structure covering the above-mentioned shelf driving mechanism 300 includes two parts, one of which is the air duct cover 401 covering the driving motor 303 and the upper half of the pulling rope 304. Since the driving motor 303 is installed on the rear wall of the refrigerating chamber 100B, the driving motor 303 and the upper half portion of the pulling rope 304 can be covered with the duct cover 401 skillfully, so that the appearance integrity in the refrigerating chamber is better. The other part is a decorative plate 501 covering the area where the guide rail 301 is located, the decorative plate 501 is located on the left side and the right side of the air duct cover plate 401, as shown in fig. 15, the decorative plate 501 is provided with an opening 5011 extending up and down, and the adjustable layer frame 103 is arranged inside the opening 5011 in a penetrating manner and connected with the support 302. As shown in fig. 14 and 15, one end of the decorative plate 501 is clamped in the guide rail installation groove 107, the other end of the decorative plate 501 is fixed on the rear wall of the refrigerating chamber 100B through two screws, and two sides of the air duct cover plate 401 can cover part of the plate surface of the decorative plate 501, so that the integrity in the refrigerating chamber can be maintained, and the problems that the guide rail, the pulley assembly and the like are exposed outside, the lifting of the adjustable shelf is influenced by the stored articles and the like are avoided.

The decorative plate 501 is provided with an air guide face 5012 at the air outlet 402 of the air duct assembly 400, and is used for guiding the air outlet direction of the air duct assembly. Specifically, the inclined surface or the inward concave arc surface of the air guide surface 5012 can prevent the decorative plate 501 from blocking the air outlet of the air duct assembly 400 by arranging the air guide surface 5012 at the air outlet 402, so that the refrigerating effect of the refrigerating chamber is affected.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.