refrigerator

Abstract

The present invention provides a refrigerator comprising a housing, a first shelf, a second shelf, an obstacle detection device, and a main control panel. The housing has a storage compartment, wherein the first shelf and the second shelf are arranged side by side in the storage compartment, and the first shelf and the second shelf are configured to be raised and lowered in the vertical direction, respectively. The obstacle detection device is disposed on the upper surface of the first shelf and is located at the edge of the first shelf near the second shelf. The obstacle detection device is configured to detect whether there is an obstacle at the edge of the first shelf when the height difference between the first shelf and the second shelf is less than a preset distance threshold. The main control panel is electrically connected to the obstacle detection device and is configured to prohibit the first shelf and the second shelf from being raised or lowered if the obstacle detection device detects the presence of an obstacle. For two liftable shelves, the refrigerator of the present invention can reduce the risk of items tipping over, improve the safety of lifting the two shelves, and is highly practical and easy to promote.

Description

Technical Field

[0001] The present invention relates to the field of refrigeration and freezing, and in particular to a refrigerator. Background Art

[0002] Typically, the temperature field in the refrigerator storage compartment often has a certain temperature difference. In order to accurately control the temperature of food, the prior art has developed a liftable shelf, which can be automatically or manually adjusted in height. However, the prior art shelf is single, which cannot fully utilize the storage compartment space and has a poor user experience. Summary of the Invention

[0003] An object of the present invention is to overcome at least one drawback of the prior art and to provide a refrigerator having two liftable shelves.

[0004] A further object of the present invention is to reduce the risk of items that span the two shelves and are located at the edge of the first shelf from falling over, thereby improving safety when the first shelf and the second shelf are raised or lowered.

[0005] Another further object of the present invention is to make the adjustment of the first rack and the second rack more reliable.

[0006] Another further object of the present invention is to enable the first rack and the second rack to not only be lifted and lowered smoothly but also to hover stably so as to carry items at different heights.

[0007] In particular, the present invention provides a refrigerator comprising: a body having a storage compartment;

[0008] A first shelf and a second shelf are arranged side by side in the storage room, and the first shelf and the second shelf are configured to be respectively raised and lowered in a vertical direction; an obstacle detection device is provided on an upper surface of the first shelf and located at an edge of the first shelf adjacent to the second shelf, and is configured to detect whether there is an obstacle at the edge of the first shelf when the height difference between the first shelf and the second shelf is less than a preset distance threshold;

[0009] The main control board is electrically connected to the obstacle detection device and is configured to prohibit the first rack and the second rack from being raised or lowered when the obstacle detection device detects the presence of an obstacle.

[0010] Optionally, the refrigerator also includes: two sets of driving mechanisms, used to drive the first shelf and the second shelf to rise and fall respectively, each set of driving mechanisms also includes a lifting motor; and the main control board is electrically connected to the two lifting motors respectively, and the main control board is configured to prohibit the two lifting motors from starting when the obstacle detection device detects the presence of an obstacle.

[0011] Optionally, each driving mechanism further includes: a lead screw, arranged in a vertical direction and connected to a lifting motor; a guide rod, arranged in a vertical direction; a lifting frame, which includes a connecting member and a support member for supporting the first shelf or the second shelf, the connecting member being slidably connected to the guide rod and threadedly connected to the screw of the lead screw, the support member being fixed to the connecting member, and the lifting frame being configured such that the connecting member is lifted and lowered along the guide rod under the drive of the lead screw, so that the support member drives the first shelf or the second shelf to lift and lower.

[0012] Optionally, the obstacle detecting device is an infrared sensor; and the obstacle detecting device is configured to emit infrared light from back to front to detect obstacles at the edge of the first rack using the infrared light.

[0013] Optionally, the height between the light-emitting portion of the obstacle detection device and the upper surface of the first rack is any value within the range of 0 to 3 cm.

[0014] Optionally, the preset distance threshold is configured to be any value within the range of 0 to 3 cm.

[0015] Optionally, the lifting motor is a stepping motor.

[0016] Optionally, the refrigerator further includes: a distance measuring device electrically connected to the main control board, configured to detect a height difference between the first shelf and the second shelf, and send the height difference value to the main control board.

[0017] Optionally, the distance measuring device is a Hall sensor.

[0018] Optionally, the refrigerator further comprises: a voice prompt device electrically connected to the main control board, configured to give a voice prompt when the first shelf and the second shelf are prohibited from being raised or lowered.

[0019] In the refrigerator of the present invention, the first shelf and the second shelf are arranged side by side in the storage compartment and can be raised and lowered. The obstacle detecting device is arranged on the first shelf and is located near the edge of the second shelf to detect whether there is an obstacle at the edge of the first shelf. When the obstacle detecting device detects the existence of an obstacle, the first shelf and the second shelf are prohibited from being raised or lowered. When the obstacle detecting device detects that there is no obstacle, the first shelf and the second shelf can be raised or lowered freely without restraint. This reduces the risk of items that span the two shelves and are located at the edge of the first shelf falling over, and improves the safety of the first shelf and the second shelf when they are raised or lowered.

[0020] Furthermore, in the refrigerator of the present invention, the prerequisite for the operation of the obstacle detection device is that the first shelf and the second shelf are less than a preset distance threshold, and the preset distance threshold can be set to any value within the range of 0 to 3 cm. That is to say, the prerequisite for the operation of the obstacle detection device is not that the first shelf and the second shelf are completely in a level state, but that there is a certain height difference. This can expand the range of conditions for detection by the obstacle detection device, making the adjustment of the first shelf and the second shelf more reliable and safer.

[0021] Furthermore, in the refrigerator of the present invention, the fixed end of the lifting motor can be fixed to the housing, the output shaft of the lifting motor can be connected to one end of the lead screw through a coupling, etc., the guide rod can be fixed to the housing in the vertical direction and is located on one side of the lead screw, a portion of the connecting member of the lifting frame is slidably connected to the guide rod, and the other portion is threadedly connected to the screw of the lead screw, and the support member of the lifting frame is fixed to the bottom surface of the first shelf and the connecting member of the lifting frame. During the lifting process, the lifting motor is started to drive the lead screw to rotate, and the lead screw drives the connecting member of the lifting frame to rise and fall, the guide rod can play a role in guiding and limiting the axial freedom of the connecting member, the connecting member drives the support member to rise and fall, and the support member can drive the first shelf (or the second shelf) to rise and fall, and the driving mechanism composed of the lifting motor, the lead screw, the guide rod and the lifting frame can make the first shelf (or the second shelf) not only rise and fall smoothly, but also hover stably, so as to carry items at different heights.

[0022] Based on the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will become more aware of the above and other objects, advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0024] Figure 1 is a schematic structural diagram of a first shelf, a second shelf and a driving mechanism thereof in a refrigerator according to one embodiment of the present invention;

[0025] Figure 2 is a schematic diagram of the positional relationship between a first shelf, a second shelf, and an obstacle detection device in a refrigerator according to one embodiment of the present invention;

[0026] Figure 3 1 is a block diagram of the working principle of a refrigerator according to an embodiment of the present invention. DETAILED DESCRIPTION

[0027] In the description of this embodiment, it should be understood that the terms "longitudinal," "transverse," "length," "width," "thickness," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "depth," and the like, indicating orientations or positional relationships, are based on the orientation of the refrigerator in normal use and can be determined with reference to the orientations or positional relationships shown in the accompanying drawings. For example, the orientation "front" refers to the side facing the user. This is merely for the convenience of describing the present invention and to simplify the description. It does not indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, it should not be construed as limiting the present invention.

[0028] The present invention provides a refrigerator, which may include a cabinet and a door. The cabinet may include an outer shell and one or more inner containers. The outer shell is located at the outermost side of the refrigerator to protect the entire refrigerator. The space between the inner container and the outer shell is filled with insulation material (forming a foam layer) to reduce heat dissipation from the inner container. Each inner container can define a storage compartment open to the front, and the storage compartment can be configured as a refrigerator, a freezer, a temperature-changing chamber, etc. The specific number and function of the storage compartments can be configured according to pre-determined requirements.

[0029] The door body can be set on the front side of the box body for opening and closing the storage compartment. The door body can be set on one side of the front of the box body in a hinged manner and open and close the storage compartment by pivoting. The number of door bodies can match the number of storage compartments, so that the storage compartments can be opened one by one.

[0030] The refrigerator can also be provided with cold capacity by a circulating refrigeration system, and the refrigeration system can be a refrigeration circulation system composed of a compressor, a condenser, a throttling device and an evaporator.

[0031] See also Figures 1 to 3 , Figure 1 1 is a schematic structural diagram of a first shelf 100, a second shelf 200 and a driving mechanism thereof in a refrigerator according to an embodiment of the present invention. Figure 2 1 is a schematic diagram showing the positional relationship between the first shelf 100, the second shelf 200, and the obstacle detection device 300 in a refrigerator according to an embodiment of the present invention. Figure 3The following is a block diagram of the operating principle of a refrigerator according to one embodiment of the present invention. In some embodiments, the refrigerator may include a first rack 100, a second rack 200, an obstacle detection device 300, and a main control board 400. The first rack 100 and the second rack 200 are arranged side by side within a storage compartment, and the first rack 100 and the second rack 200 can be independently controlled to rise and fall vertically. The obstacle detection device 300 is disposed on the upper surface of the first rack 100, at the edge of the first rack 100 near the second rack 200. When the height difference between the first rack 100 and the second rack 200 is less than a preset distance threshold, it detects whether there is an obstacle at the edge of the first rack 100. The main control board 400 is electrically connected to the obstacle detection device 300 and is configured to prohibit the first rack 100 and the second rack 200 from rising or falling if the obstacle detection device 300 detects the presence of an obstacle.

[0032] That is, the refrigerator of this embodiment has two liftable racks, namely the first rack 100 and the second rack 200, which can fully utilize the space of the storage compartment and achieve precise temperature control.

[0033] The first rack 100 and the second rack 200 can be set on the left or right side of the storage compartment. Figure 1 The first rack 100 is shown on the right and the second rack 200 is shown on the left. However, it is understood that the positions of the first rack 100 and the second rack 200 can also be interchanged. Figure 1 The arrangement shown is described as an example.

[0034] In this embodiment, the first rack 100 and the second rack 200 can be raised and lowered vertically either operatively or automatically. For example, a user can use a remote control, adjustment buttons, or the like to raise and lower the first rack 100 and the second rack 200 according to the size of the items to be stored. For another example, the first rack 100 and the second rack 200 can also be raised and lowered by voice control or automatic control to precisely control the temperature of the items.

[0035] The obstacle detection device 300 is located at the edge of the first rack 100 near the second rack 200. It detects whether there is an obstacle at the edge of the first rack 100 when the height difference between the first rack 100 and the second rack 200 is less than a preset distance threshold. The obstacle detection device 300 transmits the detection results to the main control board 400, which can then prohibit or allow the first rack 100 and the second rack 200 from being raised or lowered based on the detection results.

[0036] Specifically, when the height difference between the first rack 100 and the second rack 200 is greater than a preset distance threshold, the first rack 100 and the second rack 200 can be freely raised and lowered. Since there is a large height difference between the first rack 100 and the second rack 200 at this time, it can be determined that there is no obstacle between the first rack 100 and the second rack 200, and both can be allowed to rise and fall freely.

[0037] When the height difference between the first rack 100 and the second rack 200 is less than a preset distance threshold, since the height difference between the first rack 100 and the second rack 200 is small at this time, the user may place some large items across the first rack 100 and the second rack 200. At this time, once any shelf movement is controlled, there is a risk of items tipping over, especially for tall containers or open containers, which may easily cause liquid to flow out and pollute the storage compartment environment.

[0038] At this point, the obstacle detection device 300 begins to detect whether there is an obstacle at the edge of the first rack 100. If there is an obstacle at the edge of the first rack 100, it can be determined that there is an item between the first rack 100 and the second rack 200 or on the edge of the first rack 100. The obstacle detection device 300 can send this detection result to the main control board 400, which can prohibit the raising or lowering of either the first rack 100 or the second rack 200 to prevent items from falling. If the obstacle detection device 300 does not detect an obstacle, the first rack 100 and the second rack 200 can be raised or lowered freely without any constraints.

[0039] In this embodiment, since the obstacle detection device 300 is disposed on the first rack 100 and detects whether there is an obstacle near the edge of the second rack 200 on the first rack 100, the obstacle detection device 300 may detect the presence of an obstacle in two situations: first, the obstacle straddles the first rack 100 and the second rack 200; and second, the obstacle is at the edge of the first rack 100 but not on the second rack 200. The inventors have recognized that in the second situation, even though the detected "obstacle" does not straddle the first rack 100 and the second rack 200, once the first rack 100 and the second rack 200 are allowed to be raised or lowered, items may easily fall due to inertia and the shaking caused by the lifting. Therefore, in this embodiment, in the second situation, the main control board 400 still prohibits the lifting of the first rack 100 and the second rack 200, further reducing the risk of items falling and improving the safety of the first rack 100 and the second rack 200 during the lifting or lowering.

[0040] See also Figure 1 and Figure 3Furthermore, the refrigerator may also include two sets of driving mechanisms, which are used to drive the first shelf 100 and the second shelf 200 to rise and fall respectively. Each set of driving mechanisms may also include a lifting motor 510. The main control board 400 is electrically connected to the two lifting motors 510 respectively. The main control board 400 is configured to prohibit the two lifting motors 510 from starting when the obstacle detection device 300 detects the presence of an obstacle.

[0041] Specifically, the lifting motor 510 can also be provided with a protection circuit. The obstacle detection device 300 sends its detection results to the main control board 400. The main control board 400 sends instructions to the protection circuit according to the detection results, so that when an obstacle is detected, the protection circuit is used to prohibit the two lifting motors 510 from starting, and when no obstacle is detected, the two lifting motors 510 are allowed to start.

[0042] Furthermore, the refrigerator can also be provided with an indicator light to show the user in real time whether the starting conditions of the lifting motor 510 are met. For example, when the indicator light is green, it means that the starting conditions are met. When the indicator light is red, it means that the starting conditions are not met and the user needs to adjust the position of the item.

[0043] See also Figure 1 Furthermore, each driving mechanism may also include a lead screw 520, a guide rod 530 and a lifting frame 540. The lead screw 520 is arranged in the vertical direction and is connected to the lifting motor 510. The guide rod 530 is arranged in the vertical direction. The lifting frame 540 includes a connecting member 542 and a support member 544 for supporting the first rack 100 or the second rack 200. The connecting member 542 is slidably connected to the guide rod 530 and is threadedly connected to the screw 522 of the lead screw 520. The support member 544 is fixed to the connecting member 542. The lead screw 520 can drive the lower connecting member 542 to rise and fall along the guide rod 530, so that the support member 544 drives the first rack 100 or the second rack 200 to rise and fall.

[0044] The fixed end of the lifting motor 510 can be fixed on the box body, and the output shaft of the lifting motor 510 can be connected to one end of the screw 520 through a coupling, etc. The guide rod 530 can be fixed on the box body vertically and is located on one side of the screw 520. A part of the connecting piece 542 of the lifting frame 540 is slidably connected to the guide rod 530, and the other part is threadedly connected to the screw 522 of the screw rod. The support piece 544 of the lifting frame 540 is roughly triangular in shape, one side of which is fixed to the bottom surface of the first shelf 100 (or the second shelf 200), and the other side is fixed to the connecting piece 542 of the lifting frame 540.

[0045] During rotation, the lifting motor 510 starts and drives the screw 520 to rotate. The screw 520 drives the connecting member 542 of the lifting frame 540 to rise and fall. The guide rod 530 can guide and limit the axial freedom of the connecting member 542. The connecting member 542 drives the supporting member 544 to rise and fall. The supporting member 544 can drive the first rack 100 (or the second rack 200) to rise and fall.

[0046] Furthermore, the obstacle detection device 300 is an infrared sensor, and the obstacle detection device 300 can emit infrared light from back to front to detect whether there is an obstacle at the edge of the first rack 100 using the infrared light.

[0047] That is, the infrared sensor can be set on the back side of the first rack 100, which does not occupy the space in front of the first rack 100 and reduces the probability of the user accidentally touching the obstacle detection device 300, so that the detection angle of the infrared sensor will not deviate from the set angle.

[0048] Furthermore, the height between the light-emitting portion of the obstacle detection device 300 and the upper surface of the first rack 100 is any value within the range of 0 to 3 cm, such as 0, 1 cm, or 3 cm. This limitation ensures that the light-emitting portion of the obstacle detection device 300 is slightly higher than the upper surface of the first rack 100. This prevents light emitted by the light-emitting portion of the obstacle detection device 300 from interfering with the upper surface of the first rack 100, thereby reducing the probability of false detection.

[0049] In some embodiments, the preset distance threshold can be set to any value in the range of 0 to 3 cm, such as 0, 1 cm, or 3 cm.

[0050] That is, in this embodiment, the prerequisite for detecting whether there is an obstacle on the first rack 100 is not that the first rack 100 and the second rack 200 are completely flush. The invention recognizes that the flushing of the first rack 100 and the second rack 200 is actually a special state, and the user may also cross the first rack 100 and the second rack 200 to prevent items from being placed between the two when the height difference between the two is not large (the items can be balanced at this time). Therefore, the reliability of detecting obstacles only when the two are flush is not high. Therefore, the above-mentioned limitation can expand the scope of detection conditions, making the adjustment reliability of the first rack 100 and the second rack 200 better and safer.

[0051] In some embodiments, the lifting motor 510 is a stepper motor, which is an electric motor that converts an electrical pulse signal into a corresponding angular displacement or linear displacement. Before the refrigerator leaves the factory, the refrigerator's main control board 400 can also pre-store a preset angular displacement. After receiving the action instruction from the main control board 400, the lifting motor 510 rotates in units of the preset angular displacement.

[0052] See also Figure 3 In some embodiments, the refrigerator may further include a distance measuring device 600, which is electrically connected to the main control board 400. The distance measuring device 600 can detect the height difference between the first shelf 100 and the second shelf 200 and send the height difference value to the main control board 400.

[0053] In this embodiment, the distance measuring device 600 can be a Hall sensor, and the number of Hall sensors can be two. The two Hall sensors are electrically connected to the two lifting motors 510 respectively, and are used to detect the number of steps of the two lifting motors 510. Since the driving motor drives the lead screw 520 and the lead screw 520 drives the lifting frame 540 to rise and fall, which can be regarded as a linear relationship, the relationship between the number of steps of the stepper motor and the lifting distance can be pre-stored before the refrigerator leaves the factory, and then the height of each shelf is determined, and then the height difference between the first shelf 100 and the second shelf 200 is determined.

[0054] Of course, those skilled in the art can make corresponding modifications after knowing the solution of this embodiment, and can still detect the height difference between the first rack 100 and the second rack 200, for example, by using an infrared rangefinder and other devices, which are not listed here one by one.

[0055] See also Figure 3 In some embodiments, the refrigerator may further include a voice prompt device 700, which may be a speaker. The voice prompt device 700 may be electrically connected to the main control board 400. When the main control board 400 prohibits the two lifting motors 510 from starting, a prompt sound or a pre-stored prompt voice is issued to the user so that the user can adjust the position of the items in time.

[0056] In the refrigerator of the present invention, the first shelf 100 and the second shelf 200 are arranged side by side in the storage compartment and can be raised and lowered. The obstacle detecting device 300 is arranged on the first shelf 100 and is located near the edge of the second shelf 200 to detect whether there is an obstacle at the edge of the first shelf 100. When the obstacle detecting device 300 detects the existence of an obstacle, the first shelf 100 and the second shelf 200 are prohibited from being raised or lowered. When the obstacle detecting device 300 detects that there is no obstacle, the first shelf 100 and the second shelf 200 can be raised or lowered freely without restraint. This reduces the risk of items spanning the two shelves and located at the edge of the first shelf 100 from falling over, and improves the safety of the first shelf 100 and the second shelf 200 when they are raised or lowered.

[0057] Furthermore, in the refrigerator of the present invention, the prerequisite for the operation of the obstacle detection device 300 is that the distance between the first shelf 100 and the second shelf 200 is less than a preset distance threshold, and the preset distance threshold can be set to any value within the range of 0 to 3 cm. That is to say, the prerequisite for the operation of the obstacle detection device 300 is not that the first shelf 100 and the second shelf 200 are completely in a flush state, but that there is a certain height difference between them. This can expand the range of conditions for detection by the obstacle detection device 300, making the adjustment of the first shelf 100 and the second shelf 200 more reliable and safer.

[0058] Furthermore, in the refrigerator of the present invention, the fixed end of the lifting motor 510 can be fixed on the box body, the output shaft of the lifting motor 510 can be connected to one end of the screw 520 through a coupling, etc., the guide rod 530 can be fixed on the box body along the vertical direction and is located on one side of the screw 520, a part of the connecting piece 542 of the lifting frame 540 is slidably connected to the guide rod 530, and the other part is threadedly connected to the screw 522 of the screw, and the support piece 544 of the lifting frame 540 is fixed to the bottom surface of the first shelf 100 and the connecting piece 542 of the lifting frame 540 at the same time. During the lifting process, the lifting motor 510 is started, driving the screw 520 to rotate, and the screw 520 drives the connecting piece 542 of the lifting frame 540 to rise and fall. The guide rod 530 can guide and limit the axial freedom of the connecting piece 542. The connecting piece 542 drives the supporting piece 544 to rise and fall, and the supporting piece 544 can drive the first rack 100 (or the second rack 200) to rise and fall. The driving mechanism composed of the lifting motor 510, the screw 520, the guide rod 530 and the lifting frame 540 can make the first rack 100 (or the second rack 200) not only rise and fall smoothly, but also hover stably, so as to carry items at different heights.

[0059] At this point, those skilled in the art will recognize that, although a number of exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications consistent with the principles of the present invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and deemed to cover all such other variations or modifications.

Claims

1. A refrigerator, characterized in that include: A box body having a storage compartment; A first rack and a second rack are arranged side by side in the storage compartment, and the first rack and the second rack are configured to be respectively raised and lowered in a vertical direction; an obstacle detection device disposed on an upper surface of the first rack and located at an edge of the first rack near the second rack, configured to detect whether there is an obstacle at the edge of the first rack when the height difference between the first rack and the second rack is less than a preset distance threshold; a main control board electrically connected to the obstacle detection device and configured to prohibit the first rack and the second rack from being raised or lowered if the obstacle detection device detects the presence of an obstacle; a distance measuring device, electrically connected to the main control board, configured to detect a height difference between the first shelf and the second shelf, and send the height difference value to the main control board; The preset distance threshold is configured to be any value within the range of 0 to 3 cm.

2. The refrigerator according to claim 1, characterized in that Also includes: Two sets of driving mechanisms, used to respectively drive the first rack and the second rack to rise and fall, each set of the driving mechanisms further comprising a lifting motor; and The main control board is electrically connected to the two lifting motors respectively. The main control board is configured to prohibit the two lifting motors from starting when the obstacle detection device detects the presence of an obstacle.

3. The refrigerator according to claim 2, characterized in that Each set of the driving mechanism also includes: A lead screw is arranged in a vertical direction and connected to the lifting motor; A guide rod is arranged in a vertical direction; The lifting frame includes a connecting member and a support member for supporting the first shelf or the second shelf, the connecting member is slidably connected to the guide rod and is threadedly connected to the screw of the lead screw, the support member is fixed to the connecting member, and the lifting frame is configured such that the connecting member is lifted and lowered along the guide rod under the drive of the lead screw, so that the support member drives the first shelf or the second shelf to be lifted and lowered.

4. The refrigerator according to claim 1, characterized in that The obstacle detection device is an infrared sensor; and The obstacle detection device is configured to emit infrared light from back to front to detect obstacles at the edge of the first rack using infrared light.

5. The refrigerator according to claim 4, characterized in that The height between the light emitting portion of the obstacle detection device and the upper surface of the first rack is any value within the range of 0 to 3 cm.

6. The refrigerator according to claim 2, characterized in that The lifting motor is a stepping motor.

7. The refrigerator according to claim 1, characterized in that The distance measuring device is a Hall sensor.

8. The refrigerator according to claim 1, characterized in that Also includes: The voice prompt device is electrically connected to the main control board and is configured to give a voice prompt when the first rack and the second rack are prohibited from being raised or lowered.

Images