Buffering assistance mechanism, door opening and closing assembly and refrigerator

Abstract

The utility model relates to the technical field of assistance and buffering structures, in particular to a buffering assistance mechanism, a door opening and closing assembly and a refrigerator. The buffering power-assisted mechanism comprises a fixed part, a sliding part, an elastic piece and a crank. An annular guide groove is formed in the sliding part, and a first limiting position and a second limiting position are formed in the two ends, in the first direction, of the guide groove correspondingly; the elastic piece enables the sliding part to have the tendency of sliding in the direction from the second limiting position to the first limiting position; the free end of the crank is matched with the guide groove, and when the free end moves to the two ends of the guide groove in the first direction, the free end is located at the first limiting position or the second limiting position under the acting force of the elastic piece. In the door closing process, the sliding part is pushed to move and overcome the elastic reset force of the elastic piece, thrust borne by the sliding part is absorbed by the elastic piece, and therefore collision during door closing is reduced, and door closing noise is lowered; in the door opening process, the elastic reset force accumulated by the elastic piece in the door closing process can be fully utilized to achieve assisted door opening.

Description

Technical Field

[0001] The present application relates to the technical field of power assist and buffer structures, and in particular to a buffer power assist mechanism, a door opening and closing assembly, and a refrigerator. Background Art

[0002] French refrigerators originated in France. Their unique design and functions bring many conveniences to users. The door structure is a double-door refrigerator and freezer drawer. French refrigerators usually have a large freezer drawer at the bottom that is the same width as the refrigerator. This design allows users to store large-sized ingredients without disassembling them. As people's living standards improve, the volume of refrigerators is getting larger and larger, especially the popularity of French refrigerators. The convenience and practicality of using French refrigerators have boosted the sales of French refrigerators year by year.

[0003] A major drawback of traditional French refrigerators is that it is very difficult to pull out the large freezer drawer. In addition to overcoming the suction force of the door seal, the user also needs to overcome the following resistances when pulling out the drawer:

[0004] The resistance created by the weight of the drawer itself and the items inside it;

[0005] As the number of refrigerator door openings increases, negative pressure is likely to form inside the refrigerator compartment, which in turn creates door opening resistance;

[0006] The track of the freezer drawer guide rail on the cabinet is generally designed to be an inclined surface. The advantage of this design is that when the freezer drawer door is closed, a compression force is formed on the door seal, making the door seal better to prevent cold leakage. However, this inclined design undoubtedly makes the freezer drawer door more difficult to open. Utility Model Content

[0007] In order to solve the above technical problems, the present application provides a buffer assist mechanism, a door opening and closing assembly and a refrigerator.

[0008] In a first aspect, an embodiment of the present application provides a buffer assist mechanism, which includes:

[0009] Fixed part;

[0010] A sliding part, which can slide back and forth relative to the fixed part along a first direction, and an annular guide groove is formed on the sliding part, and two ends of the guide groove along the first direction respectively form a first limit position and a second limit position;

[0011] an elastic member, wherein the elastic member is disposed between the sliding portion and the fixing portion, and an elastic restoring force of the elastic member causes the sliding portion to have a tendency to slide in a direction from the second limit position to the first limit position;

[0012] A crank, the rotating end of the crank is rotatably connected to the fixed part, and the free end of the crank cooperates with the guide groove. When the free end moves to the two ends of the guide groove in the first direction, the free end is located at the first limit position or the second limit position at the lower limit of the force of the elastic member.

[0013] Further, the first limit position is a depression formed on the inner wall of the guide groove, the second limit position is a depression formed on the outer wall of the guide groove, and the rotating end of the crank is located on a side of the second limit position away from the first limit position.

[0014] Further, a line connecting the first limit position and the second limit position divides the guide groove into a first guide groove and a second guide groove, a first guide surface directly facing the first limit position is formed on an outer wall of the guide groove, and a second guide surface directly facing the second limit position is formed on an inner wall of the guide groove;

[0015] When the sliding portion slides close to the rotating end, the first guide surface is configured to guide the free end located at the first limit position into the first guide groove, and the second guide surface is configured to guide the free end located at the second limit position into the second guide groove.

[0016] Further, the first guide surface gradually moves away from the first limit position in the first direction as it gradually enters the first guide groove; and the second guide surface gradually moves away from the second limit position in the first direction as it gradually enters the second guide groove.

[0017] Furthermore, a third guide surface is provided on the outer wall of the first guide groove, and when the sliding portion slides away from the rotating end, the third guide surface is configured to guide the free end located in the first guide groove to enter the second limit position.

[0018] Furthermore, a third limit point is provided at one end of the second guide groove close to the first limit point, and the third limit point is a depression formed on the outer wall of the guide groove, and a fourth guide surface is formed on the inner wall of the guide groove to be opposite to the third limit point, and when the sliding part slides away from the rotating end, the fourth guide surface is configured to guide the free end located at the third limit point to enter the first limit point.

[0019] Furthermore, a fifth guide surface is provided on the outer wall of the second guide groove, and when the sliding portion slides close to the rotating end, the fifth guide surface is configured to guide the free end located in the second guide groove to enter the third limit position.

[0020] Furthermore, the sliding part is connected to a push rod, one end of the push rod is connected to the sliding part, and the other end of the push rod extends to the outside of the fixing part.

[0021] In a second aspect, an embodiment of the present application further provides a door opening and closing assembly, which includes a movable door and the buffer assist mechanism provided in the first aspect of the present application, and the movable door can trigger the sliding part during the opening and closing process.

[0022] In a third aspect, an embodiment of the present application further provides a refrigerator, which includes the switch door assembly provided in the second aspect of the present application.

[0023] When the buffer assist mechanism is applied to the process of opening and closing the door, during the process of closing the door, the thrust of closing the door pushes the sliding part to move and overcome the elastic restoring force of the elastic part, and the thrust received by the sliding part is absorbed by the elastic part, thereby reducing the collision during door closing and reducing the closing noise; during the process of opening the door, the elastic restoring force accumulated by the elastic part during the process of closing the door can be fully utilized to achieve assisted door opening. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings constituting a part of this application are used to provide a further understanding of this application, so that other features, purposes and advantages of this application become more obvious. The schematic embodiment drawings and their descriptions of this application are used to explain this application and do not constitute an improper limitation on this application. In the drawings:

[0025] Figure 1 A three-dimensional diagram of a buffer assist mechanism provided in an embodiment of the present application is schematically provided;

[0026] Figure 2 A connection diagram of some structures in the buffer assist mechanism provided in an embodiment of the present application is schematically provided;

[0027] Figure 3-10 The structure diagram of the buffer assist mechanism provided in the embodiment of the present application in different working states is schematically given;

[0028] Fig.11 The structure diagram of the refrigerator provided in the embodiment of the present application is schematically given;

[0029] Fig.12 A schematic diagram of the structure of the door opening and closing assembly of the refrigerator provided in the embodiment of the present application in the door closing state is provided;

[0030] Fig.13 A structural diagram of the door opening and closing assembly of the refrigerator provided in an embodiment of the present application in an open door state is schematically provided.

[0031] In the figure:

[0032] 100. Buffer assist mechanism;

[0033] 110, fixing portion; 111, fixing wing plate; 112, fixing bolt;

[0034] 120, sliding portion; 121, first limit position; 122, second limit position; 123, first guide surface; 124, second guide surface; 125, third guide surface; 126, third limit position; 127, fourth guide surface; 128, fifth guide surface;

[0035] 130, guide groove; 131, first guide groove; 132, second guide groove;

[0036] 140. Elastic parts;

[0037] 150, crank; 151, rotating end; 152, free end;

[0038] 160, ejector rod;

[0039] 200, movable door; 210, door body; 220, drawer; 230, roller;

[0040] 300, box body;

[0041] 400, guide rail;

[0042] 500. Seal. DETAILED DESCRIPTION

[0043] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0044] It should be noted that the terms "including" and "having" and any variations thereof in the specification and claims of the present application and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a system, product or device comprising a series of units is not necessarily limited to those units explicitly listed, but may include units that are not explicitly listed or inherent to these products or devices.

[0045] In this application, the directions or positional relationships indicated by the terms "upper", "lower", "inner", "middle", "outer", etc. are based on the directions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction.

[0046] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0047] In addition, the terms "disposed", "connected", and "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0048] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0049] The embodiment of the present application discloses a buffer assist mechanism 100, which can be applied to the door opening and closing components of various devices, preferably to devices with a push-pull drawer 220 structure, and specific application devices include but are not limited to cabinets, furniture, refrigerators, etc. The embodiment of the present application takes the application of the buffer assist mechanism 100 to a French refrigerator as an example for schematic description. Specifically, the buffer assist mechanism 100 is used to play a buffering role when the drawer 220 of the French refrigerator is closed and to play a boosting role when it is opened.

[0050] like Figure 1-10 As shown, the buffer assist mechanism 100 provided in the embodiment of the present application mainly includes a fixing portion 110 , a sliding portion 120 , an elastic member 140 and a crank 150 .

[0051] The fixing portion 110 serves as a mounting support carrier for various structures, is a basic component of the buffer assist mechanism 100 of the present application, and provides a mounting basis for at least some other components of the buffer assist mechanism 100 . The sliding portion 120 can slide back and forth along the first direction relative to the fixed portion 110, and an annular guide groove 130 is provided on the sliding portion 120, and the two ends of the guide groove 130 along the first direction respectively form a first limit position 121 and a second limit position 122; the elastic member 140 is arranged between the sliding portion 120 and the fixed portion 110, and the elastic restoring force of the elastic member 140 makes the sliding portion 120 have a tendency to slide along the direction from the second limit position 122 to the first limit position 121; the rotating end 151 of the crank 150 is rotatably connected to the fixed portion 110, and the free end 152 of the crank 150 cooperates with the guide groove 130. When the free end 152 moves to the two ends of the guide groove 130 in the first direction, the free end 152 is located at the first limit position 121 or the second limit position 122 at the lower limit of the force of the elastic member 140.

[0052] In the above embodiment, the fixed portion 110 is fixedly arranged relative to the device body to which it is applied. When no external force is applied to the sliding portion 120, the sliding portion 120 slides relative to the fixed portion 110 under the force of the elastic member 140, and the free end 152 of the crank 150 moves in the guide groove 130, and the rotating end 151 of the crank 150 rotates relative to the fixed portion 110 until the free end 152 of the crank 150 moves to the second limit position 122. The force of the elastic member 140 applied to the sliding block causes the free end 152 of the crank 150 to be limited to the second limit position 122, that is, as shown in FIG. Figure 3 When the door closing operation is required, the movable door 200 can push the sliding part 120 to overcome the elastic restoring force of the elastic member 140 before being completely closed, and slide relative to the fixed part 110, so that the free end 152 of the crank 150 escapes from the second limit position 122 and moves along the guide groove 130 until the free end 152 of the crank 150 moves along the guide groove 130 to the first limit position 121. At this time, the movable door 200 just completes the door closing operation, and the free end 152 of the crank 150 is limited at the first limit position 121, that is, as shown in FIG. Figure 8 The state shown; when the door opening operation is required, the sliding part 120 can be triggered by moving the movable door 200, so that the sliding part 120 disengages from the first limit position 121, and the elastic member 140 that accumulates the elastic reset force will drive the sliding part 120 to move in the reverse direction, so that the free end 152 of the crank 150 disengages from the first limit position 121 and moves along the guide groove 130, and the door opening operation is completed with the help of the elastic force of the elastic member 140.

[0053] When the buffer assist mechanism 100 is applied to the process of opening and closing a door, during the process of closing the door, the thrust of closing the door pushes the sliding part 120 to move and overcome the elastic restoring force of the elastic member 140, and the thrust received by the sliding part 120 is absorbed by the elastic member 140, thereby reducing the collision of the door body 210 when closing the door and reducing the closing noise; during the process of opening the door, the elastic restoring force accumulated by the elastic member 140 during the process of closing the door can be fully utilized to realize the assisted door opening, and the annular guide groove 130 can realize the reciprocating operation of the crank 150 and the sliding part 120, thereby realizing the continuity of the operation of the buffer assist mechanism 100.

[0054] In some embodiments, Figure 1-10 As shown, the first limit position 121 is a depression formed on the inner wall of the guide groove 130, the second limit position 122 is a depression formed on the outer wall of the guide groove 130, and the rotating end 151 of the crank 150 is located on the side of the second limit position 122 away from the first limit position 121. Since the direction of the elastic restoring force of the elastic member 140 is along the direction from the second limit position 122 to the first limit position 121, that is, the direction of the movement trend generated by the sliding part 120 under the action of the elastic member 140 is along the direction from the second limit position 122 to the first limit position 121.

[0055] The first limit position 121 is set as a depression on the inner wall of the guide groove 130, and the second limit position 122 is set as a depression on the outer wall of the guide groove 130, and the second limit position 122 is located between the rotating end 151 of the crank 150 and the first limit position 121, so that the free end 152 of the crank 150 can be stuck in the depression on the inner wall of the guide groove 130 after moving to the first limit position 121, and the free end 152 of the crank 150 can be stuck in the depression on the outer wall of the guide groove 130 after moving to the second limit position 122, so that the sliding part 120 can be limited by means of the relative position and action relationship between the elastic member 140, the sliding part 120 and the crank 150, ensuring that the crank 150 rotates within a predetermined range and the sliding part 120 slides within a predetermined range.

[0056] In some embodiments, Figure 2-10As shown, the line connecting the first limit position 121 and the second limit position 122 divides the guide groove 130 into a first guide groove 131 and a second guide groove 132, and a first guide surface 123 facing the first limit position 121 is formed on the outer wall of the guide groove 130, and a second guide surface 124 facing the second limit position 122 is formed on the inner wall of the guide groove 130; when the sliding part 120 slides close to the rotating end 151, the first guide surface 123 is configured to guide the free end 152 located at the first limit position 121 to enter the first guide groove 131, and the second guide surface 124 is configured to guide the free end 152 located at the second limit position 122 to enter the second guide groove 132. It should be noted that the term "facing" means that the two are arranged facing each other in the first direction.

[0057] When the movable door 200 is in the closed state, the sliding portion 120 abuts against the free end 152 of the crank 150 under the action of the elastic member 140. Figure 8 As shown, the free end 152 of the crank 150 is stuck and limited at the first limit position 121 on the inner wall of the guide groove 130. When the door opening operation is required, the sliding part 120 is continuously triggered to slide toward the rotating end 151 of the crank 150. At this time, the first limit position 121 on the inner wall of the sliding part 120 will be away from the free end 152 of the crank 150, and the free end 152 of the crank 150 will be released from the first limit position 121 and gradually abut against the first guide surface 123 on the outer wall of the guide groove 130, resulting in the following Fig. 9 The state shown in FIG. 1 is then no longer triggered by external force to slide the sliding portion 120 toward the rotating end 151 of the crank 150. Driven by the elastic member 140, the sliding portion 120 moves in a direction away from the rotating end 151 of the crank 150, as shown in FIG. Fig.10 As shown, the free end 152 of the crank 150 gradually moves toward the second limit position 122 in the first guide groove 131, and the door opening is assisted by the elastic force of the elastic member 140, and finally the following is obtained: Figure 3 When the movable door 200 is in the open state, the sliding portion 120 abuts against the free end 152 of the crank 150 under the action of the elastic member 140, and the free end 152 of the crank 150 is stuck and limited to the second limit position 122 on the outer wall of the guide groove 130, that is, Figure 3 In the state shown in FIG. 1 , when the door needs to be closed, the sliding portion 120 is triggered to slide toward the rotating end 151 of the crank 150. At this time, the second limit portion 122 of the outer wall of the sliding portion 120 gradually moves away from the free end 152 of the crank 150, and the free end 152 of the crank 150 is released from the second limit portion 122 and gradually abuts against the second guide surface 124 on the inner wall of the guide groove 130, that is, Figure 4In the state shown in FIG. 1 , driven by an external force, the sliding portion 120 continues to slide toward the rotating end 151 of the crank 150, and the free end 152 of the crank 150 enters the second guide groove 132 under the guidance of the second guide surface 124 and gradually moves toward the first limit position 121, that is, as shown in FIG. Figure 5 Status shown.

[0058] The first guide surface 123 is used to realize the transition of the free end 152 of the crank 150 from the first limit position 121 to the first guide groove 131, and the second guide surface 124 is used to realize the transition of the free end 152 of the crank 150 from the second limit position 122 to the second guide groove 132, thereby realizing the reciprocating operation of the crank 150 and the sliding part 120 and achieving the continuity of the operation of the buffer assist mechanism 100.

[0059] In some embodiments, the first guide surface 123 gradually moves away from the first limit position 121 in the first direction as it gradually enters the first guide groove 131; the second guide surface 124 gradually moves away from the second limit position 122 in the first direction as it gradually enters the second guide groove 132. During operation, when the free end 152 of the crank 150 gradually enters the first guide groove 131 along the first guide surface 123, since the extension direction of the first guide surface 123 gradually moves away from the first limit position 121, the free end 152 of the crank 150 will not be interfered by the first limit position 121 during the movement along the first guide surface 123; when the free end 152 of the crank 150 gradually enters the second guide groove 132 along the second guide surface 124, since the extension direction of the second guide surface 124 gradually moves away from the second limit position 122, the free end 152 of the crank 150 will not be interfered by the second limit position 122 during the movement along the second guide surface 124.

[0060] In some embodiments, Figure 2 , 3As shown in FIG. 10 , a third guide surface 125 is provided on the outer wall of the first guide groove 131 , and when the sliding portion 120 slides away from the rotating end 151 , the third guide surface 125 is configured to guide the free end 152 in the first guide groove 131 to enter the second limit position 122 . As the sliding portion 120 gradually moves away from the rotating end 151 of the crank 150 under the action of the elastic member 140, the free end 152 of the crank 150 moves in the first guide groove 131 and gradually approaches the second limit position 122. When the free end 152 of the crank 150 approaches the second limit position 122, it abuts against the outer wall of the first guide groove 131. With the help of the third guide surface 125 on the outer wall of the first guide groove 131, the free end 152 of the crank 150 can be smoothly guided to the second limit position 122 to complete the stuck limit, thereby realizing the transition of the free end 152 of the crank 150 from the first guide groove 131 to the second limit position 122, thereby improving the continuity of the operation of the buffer assist mechanism 100.

[0061] In some embodiments, Figure 2 As shown, a third limit position 126 is further provided at one end of the second guide groove 132 close to the first limit position 121, and the third limit position 126 is a depression formed on the outer wall of the guide groove 130, and a fourth guide surface 127 directly opposite to the third limit position 126 is formed on the inner wall of the guide groove 130, and when the sliding part 120 slides away from the rotating end 151, the fourth guide surface 127 is configured to guide the free end 152 located at the third limit position 126 to enter the first limit position 121. It should be noted that the term "directly opposite" means that the two are directly opposite to each other in the first direction.

[0062] When the buffer assist mechanism 100 is applied to the door opening and closing process, during the door closing process, Figure 5As shown, the sliding part 120 is pushed to move by the thrust of closing the door and overcomes the elastic restoring force of the elastic member 140, the sliding part 120 slides toward the rotating end 151 of the crank 150, and the free end 152 of the crank 150 moves in the second guide groove 132 and gradually approaches the first limit position 121, and when the free end 152 of the crank 150 moves to the vicinity of the first limit position 121, it will abut against the outer wall of the guide groove 130, but the first limit position 121 is located on the inner wall of the guide groove 130, and the third limit position 126 and the fourth guide surface 127 are for guiding the free end 152 of the crank 150 in the second guide groove 132 to the first limit position 121. Specifically, during the door closing process, the sliding portion 120 is pushed to move by the thrust of the door closing and overcomes the elastic restoring force of the elastic member 140, the sliding portion 120 slides toward the rotating end 151 of the crank 150, and the free end 152 of the crank 150 moves in the second guide groove 132 and enters the third limit position 126, and the free end 152 of the crank 150 is stuck at the third limit position 126. Figure 7 As shown, the external force can no longer push the sliding part 120 to move. At this time, after the external force is removed, the elastic restoring force of the elastic member 140 will push the sliding part 120 to slide in the direction away from the rotating end 151 of the crank 150, and the free end 152 of the crank 150 will leave the third limit position 126 and gradually abut against the fourth guide surface 127. As the elastic member 140 continues to push the sliding part 120, the free end 152 of the crank 150 gradually enters the first limit position 121 along the fourth guide surface 127 to complete the stuck limit position, and the result is as shown in FIG. Figure 8 The transition of the free end 152 of the crank 150 from the third limit position 126 to the first limit position 121 is achieved, thereby improving the continuity of the operation of the buffer assist mechanism 100.

[0063] In some embodiments, Figure 2 As shown, a fifth guide surface 128 is disposed on the outer wall of the second guide groove 132. When the sliding portion 120 slides close to the rotating end 151, the fifth guide surface 128 is configured to guide the free end 152 in the second guide groove 132 to enter the third limit position 126. Figure 6 and 7As shown, in the process that the sliding portion 120 gradually approaches the rotating end 151 of the crank 150 under the action of external force, the free end 152 of the crank 150 moves in the second guide groove 132 and gradually approaches the third limit position 126. When the free end 152 of the crank 150 approaches the third limit position 126, it abuts against the outer wall of the second guide groove 132. With the help of the fifth guide surface 128 on the outer wall of the second guide groove 132, the free end 152 of the crank 150 can be smoothly guided to the third limit position 126 to complete the locking limit, thereby realizing the transition of the free end 152 of the crank 150 from the second guide groove 132 to the third limit position 126, thereby improving the continuity of the operation of the buffer assist mechanism 100.

[0064] In some embodiments, Figure 1-10 As shown, the sliding part 120 is connected with a push rod 160, one end of which is connected to the sliding part 120, and the other end of which extends to the outside of the fixed part 110. The sliding part 120 is arranged in a sliding track inside the fixed part 110 to ensure that it can perform linear motion along a predetermined path. The push rod 160 is a component for transmitting motion or force, one end of which is firmly connected to the sliding part 120, and the other end of which extends to the outside of the fixed part 110. During operation, when the sliding part 120 slides along the fixed part 110, the push rod 160 will move accordingly and then transmit the motion to the external structure through the push rod 160. On the other hand, the motion of the external structure can also be converted into a force on the sliding part 120 through the push rod 160. This design allows the push rod 160 to generate a displacement corresponding to the sliding part 120 during the movement of the sliding part 120, thereby realizing the sliding part 120 pushing the external component or the external component pushing the sliding part 120. For example, when the buffer assist mechanism 100 is applied to the process of opening and closing a door, after the push rod 160 extends to the outside of the fixed part 110, it can interact with the movable door 200. When the sliding part 120 slides along the fixed part 110 in a direction away from the rotating end 151 of the crank 150, the push rod 160 will move accordingly and then transmit the movement to the external movable door 200 through the push rod 160, so as to realize the opening operation of the movable door 200. When the external movable door 200 is closed, it can press on the push rod 160, and the movement of closing the door is converted into a force on the sliding part 120 through the push rod 160, so that the sliding part 120 slides toward the rotating end 151 of the crank 150. The connection method between the push rod 160 and the sliding part 120 can be threaded connection, welding, plug-in, integrated molding or other suitable fixing methods, which are selected according to the needs of specific applications.

[0065] The present application also provides a refrigerator, which is preferably as follows Fig.11The French refrigerator shown includes a cabinet 300 and a door opening and closing assembly, wherein the door opening and closing assembly includes a movable door 200 and a buffer assist mechanism 100 provided in an embodiment of the present application, and the movable door 200 can trigger the sliding portion 120 of the buffer assist mechanism 100 during the opening and closing process.

[0066] Alternatively, if Fig.12 and 13 As shown, the movable door 200 of the refrigerator includes a door body 210, a drawer 220 and a roller 230, wherein the roller 230 is arranged at the rear of the drawer 220, and a guide rail 400 is arranged on the refrigerator body 300. When the movable door 200 of the refrigerator is pulled out, the roller 230 at the rear of the drawer 220 cooperates with the guide rail 400, and a seal 500 is arranged on the door body 210 to achieve sealing with the box body 300 after closing the door, thereby reducing cold leakage. When the movable door 200 is opened and closed, the roller 230 can trigger the sliding part 120 of the buffer assist mechanism 100, and when the buffer assist mechanism 100 includes a push rod 160, the roller 230 triggers the sliding part 120 by contacting the push rod 160.

[0067] In the above refrigerator, the fixing part 110 of the buffer assist mechanism 100 is fixed on the box body 300, and the fixing part 110 is preferably provided with a fixing wing plate 111, and a fixing hole is provided on the fixing wing plate 111. The fixing part 110 is installed on the box body 300 after the fixing bolt 112 passes through the fixing hole.

[0068] When the roller 230 of the refrigerator is not in contact with the top rod 160, the sliding portion 120 of the buffer assist mechanism 100 will not be subjected to external force, and the sliding portion 120 will slide relative to the fixed portion 110 under the action of the elastic member 140, and the free end 152 of the crank 150 will match and move in the guide groove 130, and the rotating end 151 of the crank 150 will rotate relative to the fixed portion 110 until the free end 152 of the crank 150 moves to the second limit position 122. The force of the elastic member 140 applied to the sliding block causes the free end 152 of the crank 150 to be limited to the second limit position 122.

[0069] When the door needs to be closed, the user pushes the door body 210 and the drawer 220 will slide toward the inside of the box body 300. The roller 230 at the rear of the drawer 220 will contact the top rod 160 and push the top rod 160 to move. The top rod 160 will push the sliding part 120 to overcome the elastic restoring force of the elastic member 140 and slide relative to the fixed part 110, so that the free end 152 of the crank 150 disengages from the second limit position 122 and moves along the guide groove 130 until the free end 152 of the crank 150 moves along the guide groove 130 to the first limit position 121. At this time, the door body 210 and the drawer 220 have just completed the door closing operation. The sliding part 120 abuts against the free end 152 of the crank 150 under the action of the elastic member 140, and the free end 152 of the crank 150 is stuck and limited to the first limit position 121 on the inner wall of the guide groove 130. During the sliding process of the sliding part 120, the thrust of the drawer 220 and the roller 230 applied to the sliding part 120 is offset by the elastic force of the elastic member 140, thereby reducing the rigid collision of the roller 230, the guide rail 400 and the top rod 160, and reducing the generation of the door closing noise.

[0070] When the door needs to be opened, the door body 210 is pushed inwardly, so that the door body 210 and the drawer 220 continue to move a small displacement into the box body 300, and the roller 230 triggers the sliding part 120 to slide toward the rotating end 151 of the crank 150 through the top rod 160. At this time, the first limit position 121 of the inner wall of the sliding part 120 will be away from the free end 152 of the crank 150, and the free end 152 of the crank 150 will be out of the first limit position 121 and gradually abut against the outer wall of the guide groove 130. The free end 152 of the crank 150 enters the first guide groove 131 under the guidance of the first guide surface 123, and then no longer pushes the door body 210 inward. The external force is removed, and driven by the elastic member 140, the sliding portion 120 moves in a direction away from the rotating end 151 of the crank 150, and the free end 152 of the crank 150 gradually moves in the first guide groove 131 toward the second limit position 122, thereby achieving the assistance of opening the door with the help of the elastic force of the elastic member 140.

[0071] In some embodiments, the elastic member 140 is preferably a coil spring disposed between the sliding portion 120 and the fixed portion 110. The coil spring is specifically located on the side of the sliding portion 120 away from the top rod 160. The coil spring acts on the sliding portion 120 with an elastic force after compression deformation. In the process of assisting the door opening, when the door body 210 is opened, it is necessary to first push the door body 210 inward. Under the action of this force, the free end 152 of the crank 150 slides out of the first limit position 121 and enters the first guide groove 131. Then, under the elastic force of the coil spring, the sliding portion 120 slides in the opposite direction to achieve assisting the door opening. In this process, the condition for the user to open the door is that the door opening force F generated by the coil spring needs to be greater than the sum of F1+F2+F3+F4, where:

[0072] F1 is the suction force in the first direction generated by the seal 500 on the door body 210 and the box body 300. When the size of the door body 210 is constant, F1 is a constant value;

[0073] F2 is the friction resistance generated by the gravity of the drawer 220 and the items therein, which can be set to the state of placing the most items during the specific calculation, wherein F2 is directly proportional to the gravity of the drawer 220 and the items therein, and the proportionality coefficient depends on the friction coefficient of the sliding surface;

[0074] F3 is the door opening resistance caused by negative pressure generated inside the refrigerator compartment as the number of times the refrigerator door is opened increases. This F3 is a variable and can be specifically set based on experience and experiments.

[0075] F4 is the resistance generated by the guide rail's 400° slope on the door opening. When the slope is a constant, the value of F4 is also a constant.

[0076] Through theoretical calculation, the minimum spring force required for a user to successfully open the door can be calculated. On the basis of the aforementioned resistances, it is also necessary to consider the national standard requirement for the refrigerator door opening force of 70N, which is the minimum elastic force that the coil spring needs to have, namely: F=F1+F2+F3+F4+70N.

[0077] The calculation formula of the elastic force of the coil spring is based on Hooke's law. The relationship between the coil spring elastic force F and the spring deformation x is as follows: F = kx. Among them, F is the elastic coefficient of the coil spring, and x is the deformation of the coil spring, that is, the length of the coil spring stretched or compressed. Under the range of F, the selection of the coil spring can be determined.

[0078] The refrigerator includes the buffer assist mechanism provided in the above embodiment of the present application, so the refrigerator with the buffer assist mechanism also has all the above technical effects, which will not be described in detail here. Other structures, principles and usage methods of the refrigerator are known to ordinary technicians in the field and will not be described in detail here.

[0079] Some embodiments in this specification are described in a progressive or parallel manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referenced to each other.

[0080] The above is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A buffer assist mechanism, characterized in that: include: Fixed part; A sliding part, which can slide back and forth relative to the fixed part along a first direction, and an annular guide groove is formed on the sliding part, and two ends of the guide groove along the first direction respectively form a first limit position and a second limit position; an elastic member, wherein the elastic member is disposed between the sliding portion and the fixing portion, and an elastic restoring force of the elastic member causes the sliding portion to have a tendency to slide in a direction from the second limit position to the first limit position; A crank, the rotating end of the crank is rotatably connected to the fixed part, and the free end of the crank cooperates with the guide groove. When the free end moves to the two ends of the guide groove in the first direction, the free end is located at the first limit position or the second limit position at the lower limit of the force of the elastic member.

2. The buffer assist mechanism according to claim 1, characterized in that: The first limit position is a depression formed on the inner wall of the guide groove, the second limit position is a depression formed on the outer wall of the guide groove, and the rotating end of the crank is located on a side of the second limit position away from the first limit position.

3. The buffer assist mechanism according to claim 1, characterized in that: The connecting line of the first limit position and the second limit position divides the guide groove into a first guide groove and a second guide groove, a first guide surface directly facing the first limit position is formed on the outer wall of the guide groove, and a second guide surface directly facing the second limit position is formed on the inner wall of the guide groove; When the sliding portion slides close to the rotating end, the first guide surface is configured to guide the free end located at the first limit position into the first guide groove, and the second guide surface is configured to guide the free end located at the second limit position into the second guide groove.

4. The buffer assist mechanism according to claim 3, characterized in that: As the first guide surface gradually enters the first guide groove, it gradually moves away from the first limit position in the first direction; as the second guide surface gradually enters the second guide groove, it gradually moves away from the second limit position in the first direction.

5. The buffer assist mechanism according to claim 3, characterized in that: A third guide surface is provided on the outer wall of the first guide groove, and when the sliding portion slides away from the rotating end, the third guide surface is configured to guide the free end located in the first guide groove to enter the second limit position.

6. The buffer assist mechanism according to claim 3, characterized in that: A third limit point is also provided at one end of the second guide groove close to the first limit point. The third limit point is a depression formed on the outer wall of the guide groove. A fourth guide surface opposite to the third limit point is formed on the inner wall of the guide groove. When the sliding part slides away from the rotating end, the fourth guide surface is configured to guide the free end located at the third limit point to enter the first limit point.

7. The buffer assist mechanism according to claim 6, characterized in that: A fifth guide surface is provided on the outer wall of the second guide groove, and when the sliding portion slides close to the rotating end, the fifth guide surface is configured to guide the free end located in the second guide groove to enter the third limit position.

8. The buffer assist mechanism according to any one of claims 1 to 7, characterized in that: The sliding part is connected with a push rod, one end of the push rod is connected to the sliding part, and the other end of the push rod extends to the outside of the fixing part.

9. A door opening and closing assembly, characterized in that: It comprises a movable door and a buffer assist mechanism as claimed in any one of claims 1 to 8, wherein the movable door can trigger the sliding part during the opening and closing process.

10. A refrigerator, characterized in that: It comprises the door opening and closing assembly as claimed in claim 9.

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