A refrigerator six-bar mechanism hinge limiting mechanism and a refrigerator with the same

Abstract

The present application relates to the technical field of household appliances, and more particularly to a refrigerator six-bar mechanism hinge limiting mechanism and a refrigerator with the same, comprising a cabinet and cabinet doors, a connecting groove is formed on the outside of the cabinet, a six-bar mechanism hinge limiting mechanism is fixedly installed in the connecting groove, and multiple cabinet doors are connected with the cabinet through the six-bar mechanism hinge limiting mechanism, the hinge limiting mechanism comprises a transmission mechanism, wherein the transmission mechanism comprises a first connecting rod, a second connecting rod, a third connecting rod, a fourth connecting rod and a mounting plate. The present application solves the problems in the prior art, such as that the layout of the hinge point is mostly based on the geometric symmetry principle, the trajectory planning is not flexible enough, the cabinet side wall is easily collided, the cabinet door cannot be completely locked when it is closed, and the "false closing" phenomenon easily occurs.

Description

Technical Field

[0001] This invention relates to the field of household appliance technology, and in particular to a six-bar linkage hinge limiting mechanism for a refrigerator and a refrigerator having the limiting mechanism. Background Technology

[0002] In the field of high-end built-in home appliances, the hinge mechanism of the refrigerator door is the core component that enables the refrigerator door to open at a large angle within extremely narrow gaps. Existing refrigerator hinge types mainly include single-axis hinges, four-bar hinges, and six-bar hinges. Among them, the six-bar hinge is widely used in high-end built-in refrigerator products because it can simultaneously achieve a compound motion of translational avoidance and rotational opening, and can effectively adapt to extremely small side gaps.

[0003] In existing domestic and international technologies, most six-bar hinges are based on standard Watt-type or Stephenson-type topologies. Existing hinges attempt to constrain the instantaneous center of motion of the door through a combination of links, guiding the door to first translate outwards to avoid the side wall of the cabinet before rotating and opening.

[0004] However, after in-depth engineering analysis and practical application verification, the existing technology still has the following technical problems: First, the requirements for the door movement trajectory vary in different installation scenarios. Because the layout of hinge points in existing mechanisms is mostly based on geometric symmetry, its trajectory planning is not flexible enough. In the initial stage of door opening, the insufficient lateral displacement of the existing mechanism makes it prone to collision with the side wall of the refrigerator. In the later stage of opening, the movement trajectory tends to expand excessively outward, requiring a sufficiently large space to ensure normal door opening. Furthermore, the mechanical properties of existing hinges are fixed at the end of the door's closing phase. When facing a heavy refrigerator door with strong sealing strip reaction force, the reduced transmission angle and drastic decrease in mechanical benefit during the final stage of closing the door result in insufficient self-closing force, easily causing the door to fail to lock completely, resulting in a "half-closed" phenomenon, seriously affecting cooling efficiency and operational safety.

[0005] Therefore, it is necessary to design a six-bar linkage hinge limiting mechanism for a refrigerator that can generate an outward movement trajectory and increase lateral avoidance displacement when the door is opened, and actively provide sufficient self-closing force when closed, and a refrigerator with such limiting mechanism, to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to address the problems in the prior art where the layout of hinge points is mostly based on the principle of geometric symmetry, the trajectory planning is not flexible enough, it is easy to collide with the side wall of the cabinet, and it is easy to have a "half-closed" phenomenon when the cabinet door is closed. Therefore, this invention proposes a six-bar mechanism hinge limiting mechanism for refrigerators and a refrigerator with such limiting mechanism.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a hinge limiting mechanism for a refrigerator six-bar linkage, comprising: A mounting bracket, used to connect to the refrigerator body, is L-shaped. Base, the base being used to connect to the refrigerator door; The transmission mechanism includes a first link, a second link, a third link, a fourth link, and a mounting plate. The first end of the first link is hinged to the middle part of the fixed base, the first end of the second link is hinged to the upper end of the fixed base, the first end of the third link is hinged to the middle part of the first link, the first end of the fourth link is hinged to the end of the first link, and the middle part of the fourth link is hinged to the end of the second link. The middle part of the mounting plate is hinged to the end of the third link, and the end of the mounting plate is hinged to the end of the fourth link. The top side of the mounting plate is fixedly connected to the inner surface of the base. In the above solution, the transmission mechanism, the fixed seat, and the base together form a six-bar linkage, which transforms the rotational motion of the refrigerator door into a complex compound motion. As the angle increases, the connecting rods push each transmission arm to unfold, causing the refrigerator door to move outward when it opens. Compared with the traditional six-bar linkage, this invention generates a longer lateral displacement when the refrigerator is opened through the interaction between the connecting rods, so that its motion trajectory will not interfere with the inner wall of the refrigerator. At the same time, the maximum opening angle of the refrigerator door can reach 115°, ensuring that the drawers and shelves inside the refrigerator can be fully pulled out, making it convenient for users to store and retrieve items without compromising its overall aesthetics.

[0008] The elastic limiting mechanism includes a spring, limiting blocks, limiting rods, and telescopic rods. Two limiting blocks are rotatably connected to the beginning ends of a third and fourth connecting rod, respectively. Both ends of the spring are fixed to adjacent sides of the two limiting blocks. The limiting rod is fixedly connected to the inner side of one of the limiting blocks. One end of the telescopic rod is fixedly connected to the inner side of the other limiting block, and the other end is slidably connected to the inner side of the limiting rod. In the above solution, the limiting mechanism in this invention has a pre-compression of 0.1mm at the initial position, and reaches maximum compression of 3.8mm when the hinge is opened to 33.8°. Afterward, the limiting mechanism begins to rebound, and the elastic mechanism returns to its original state when the hinge is opened to 81.5°. This setting ensures that in the initial stage of opening the door, pulling the door requires a certain amount of additional pulling force to compress the spring. This means that the door will not open automatically under external disturbances. Even if the refrigerator seal fails, the refrigerator door will close tightly under the influence of the limiting mechanism to prevent cold air leakage. Simultaneously, after pulling a certain distance, i.e., when the hinge opening angle is greater than 33.8°, the limiting mechanism will assist in opening the door, allowing the user to... Only a pulling force is needed at the beginning to open the refrigerator door to a sufficient angle. In normal use, since the user is standing directly in front of the refrigerator door, the latter part of the door's movement trajectory is where the user's arm is difficult to exert force. Usually, a second push from the inside of the door is required to fully open it. The aforementioned limiting mechanism assists in the opening process of the door, thus avoiding this problem. At the same time, when the hinge opens to 81.5°, the elastic mechanism returns to its original state. After that, the limiting mechanism no longer provides auxiliary pushing force, and the door continues to open to the maximum angle limited by the transmission mechanism under the user's operation. This prevents the opening angle from exceeding the expected range and colliding with other objects due to the continuous force applied by the elastic mechanism. Furthermore, in existing technologies, when the user closes the refrigerator door, the mechanical benefits decrease sharply in the final stage of closing due to the reduced transmission angle, leading to insufficient self-closing force. This results in most refrigerators experiencing a situation where, after prolonged use, the magnetic force within the sealing strip weakens, causing the door to be partially closed rather than fully shut if insufficient force is applied when closing. In contrast, this invention, by incorporating an elastic mechanism, actively provides a self-closing force to the refrigerator at the end of the door closure. Even after the refrigerator is fully closed, there remains a slight squeezing force to ensure the door is always tightly closed, rather than relying solely on the magnetic attraction within the sealing strip for sealing, as is the case with existing technologies.

[0009] Preferably, in the above-mentioned six-bar hinge limiting mechanism for a refrigerator, the bottom end of the fixed base is provided with multiple fixing holes, the upper end of the fixed base is provided with a first connecting hole, and the middle part of the fixed base is provided with a second connecting hole.

[0010] In the above scheme, multiple fixing holes allow the fixing seat to be firmly installed in the box connecting groove, which can distribute the force and improve the connection stability; the first connecting hole and the second connecting hole provide a precise positioning reference for the hinge of the connecting rod, ensuring accurate assembly and smooth movement of the transmission mechanism.

[0011] Preferably, in the above-mentioned six-bar linkage hinge limiting mechanism for a refrigerator, the first connecting rod has a third connecting hole at its first end, a fourth connecting hole in the middle part of the first connecting rod, and a fifth connecting hole at its end. The third connecting hole and the second connecting hole are rotatably connected to a first rivet, forming a hinged connection.

[0012] In the above scheme, a specific layout of connecting holes and rivet hinges enable the first connecting rod and the fixed seat to form a reliable low-friction rotating pair, which not only ensures the flexibility of movement, but also effectively improves the load-bearing capacity and transmission accuracy of the connecting rod.

[0013] Preferably, in the above-mentioned six-bar linkage hinge limiting mechanism for a refrigerator, the first end of the second connecting rod is provided with a sixth connecting hole, and the end of the second connecting rod is provided with a seventh connecting hole. The sixth connecting hole and the first connecting hole are rotatably connected with a second rivet to form a hinge connection.

[0014] In the above scheme, the second link is hinged to the upper end of the fixed seat, which can efficiently transmit the rotational torque of the box door to other links. This connection method has a simple structure, is easy to assemble, and can withstand large alternating loads, thus improving the service life of the mechanism.

[0015] Preferably, the first end of the third connecting rod has an eighth connecting hole, and the last end of the third connecting rod has a ninth connecting hole. The eighth connecting hole and the fourth connecting hole are rotatably connected to a third rivet to form a hinged connection.

[0016] In the above scheme, the third link is hinged to the middle part of the first link by a rivet, so that the two links are linked. This hinge point can accurately control the swing trajectory of the third link, and at the same time, it plays a constraining role in the opening angle to prevent the opening angle from being too large.

[0017] Preferably, in the above-mentioned hinge limiting mechanism of a refrigerator six-bar linkage, the first end of the fourth link is provided with a tenth connecting hole, the middle part of the fourth link is provided with an eleventh connecting hole, and the end of the fourth link is provided with a twelfth connecting hole. The tenth connecting hole and the fifth connecting hole are rotatably connected to a fourth rivet to form a hinge connection. The eleventh connecting hole and the seventh connecting hole are rotatably connected to a fifth rivet to form a hinge connection.

[0018] In the above scheme, the fourth link is hinged to the ends of the first link and the second link through multiple rivets, forming the core node of multi-link coordinated motion. This can synthesize the displacements of each link to generate the required composite motion trajectory, ensuring that the door obtains sufficient lateral avoidance displacement when it is opened.

[0019] Preferably, in the above-mentioned six-bar hinge limiting mechanism for a refrigerator, the first end of the mounting plate is provided with a thirteenth connecting hole, the last end of the mounting plate is provided with a fourteenth connecting hole, the thirteenth connecting hole and the ninth connecting hole are rotatably connected by a sixth rivet to form a hinge connection, and the fourteenth connecting hole and the twelfth connecting hole are rotatably connected by a seventh rivet to form a hinge connection.

[0020] In the above scheme, the mounting plate is hinged to the ends of the third and fourth links respectively by two rivets, which reliably connects the output end of the linkage mechanism to the base, ensuring the synchronization of motion transmission, enabling the door to open and close smoothly and accurately according to the predetermined trajectory, while enhancing the rigidity and torsional resistance of the overall mechanism.

[0021] Preferably, in the above-mentioned six-bar hinge limiting mechanism for a refrigerator, the upper end of the mounting plate is provided with multiple mounting holes, and bolts are threaded into the mounting holes.

[0022] Preferably, in the above-mentioned six-bar linkage hinge limiting mechanism for a refrigerator, the second rivet, the fourth rivet, the fifth rivet, the sixth rivet, and the seventh rivet are rotatably connected to the fixing block on their outer sides.

[0023] In the above scheme, rotating connection fixing blocks are set at multiple key hinge rivets, which can effectively limit the axial movement of the rivets, play a limiting role, reduce rotational wear and noise, improve the centering and movement smoothness of each member hinge, and extend the service life of the hinge mechanism.

[0024] Preferably, a refrigerator includes a cabinet and cabinet doors. The cabinet is divided into a refrigeration compartment and a freezer compartment. A connecting groove is provided on the outer side of the cabinet. A six-bar linkage hinge limiting mechanism is fixedly installed in the connecting groove. Multiple cabinet doors are connected to the cabinet through the six-bar linkage hinge limiting mechanism.

[0025] Compared with existing technologies, the advantages of this invention are: 1. This invention transforms the simple rotational motion of the refrigerator door into a combined motion of outward movement and rotation by setting a transmission mechanism. Lateral displacement occurs in the initial stage of door opening, actively avoiding obstruction from the side walls of the refrigerator and adjacent cabinets. At the same time, as the opening angle gradually increases, the door continues to move forward smoothly, allowing the maximum opening angle to reach 115°. This protects the refrigerator and cabinet structure while allowing the internal drawers and shelves to be fully pulled out, greatly improving the usability and convenience of retrieval for built-in refrigerators.

[0026] 2. This invention provides a self-closing force at the end of the refrigerator door closure by setting an elastic limiting mechanism, so that the door seal between the door and the cabinet is fully pressed together, and a weak and continuous squeezing force is maintained after the door is fully closed, ensuring that the door is continuously closed. This effectively solves the problem of door ajar caused by the weakening of the magnetic force of the sealing strip in the prior art, avoids cold air leakage, and ensures refrigeration efficiency and safety of use.

[0027] 3. This invention, through the mechanical design of the elastic limiting mechanism, provides moderate damping in the initial stage of opening the door to prevent the door from opening on its own due to external disturbances; when the opening angle reaches 33.8°, the spring is compressed to its limit and then rebounds, releasing the auxiliary thrust to provide assistance in the later stages of opening the door when the user's arm is unable to exert force, allowing the door to open easily to the required angle; when closing the door, the reverse rebound of the spring provides sufficient self-closing force to the refrigerator door, realizing intelligent switching between assistance and damping throughout the opening and closing process, making the user's operation feel light and smooth.

[0028] 4. This invention distributes the weight of the door evenly to multiple connecting rods and multiple hinge points by setting multiple hinge points in the transmission mechanism, which greatly reduces the maximum stress on the hinge points and ensures that the hinge itself is not prone to deformation or breakage under long-term repeated opening and closing of the door; at the same time, the multi-support structure of the connecting rod improves the overall fatigue resistance of the hinge, making its service life longer than that of traditional hinges, and enabling it to stably bear the weight of the refrigerator door for a long time. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of a refrigerator with a six-bar linkage hinge limiting mechanism and a refrigerator having the limiting mechanism, as proposed in this invention. Figure 2 for Figure 1 A magnified structural diagram of part A in the middle; Figure 3 This is an exploded view of the component structure of a hinge limiting mechanism for a refrigerator six-bar linkage proposed in this invention; Figure 4 This is a schematic diagram of the transmission mechanism structure of a six-bar linkage hinge limiting mechanism for a refrigerator proposed in this invention; Figure 5 This is a schematic diagram of the fixed seat structure of a hinge limiting mechanism for a refrigerator six-bar linkage proposed in this invention; Figure 6 This is a schematic diagram of the first link structure of a hinge limiting mechanism for a refrigerator six-bar linkage proposed in this invention; Figure 7 This is a schematic diagram of the second link structure of a hinge limiting mechanism for a refrigerator six-bar linkage proposed in this invention; Figure 8 This is a schematic diagram of the third link structure of a six-bar linkage hinge limiting mechanism for a refrigerator proposed in this invention; Figure 9 This is a schematic diagram of the fourth link structure of a six-bar linkage hinge limiting mechanism for a refrigerator proposed in this invention; Figure 10 This is a schematic diagram of the mounting plate and base structure of a hinge limiting mechanism for a refrigerator six-bar linkage proposed in this invention; Figure 11 This is a schematic diagram of the elastic limiting mechanism structure of a six-bar linkage hinge limiting mechanism for a refrigerator proposed in this invention; Figure 12 This is a side view of the transmission mechanism and elastic limiting mechanism structure of a refrigerator six-bar linkage hinge limiting mechanism proposed in this invention when the structure is opened to 33.8°. Figure 13 This is a side view of the transmission mechanism and elastic limiting mechanism structure of a refrigerator six-bar linkage hinge limiting mechanism proposed in this invention when the structure is opened to 81.5°. Figure 14 This is a side view of the transmission mechanism and elastic limiting mechanism structure of a refrigerator six-bar linkage hinge limiting mechanism proposed in this invention when it is opened to 115°.

[0030] In the diagram: 1. Box body; 11. Connecting groove; 2. Box door; 3. Fixing base; 31. Fixing hole; 4. Base; 5. Transmission mechanism; 51. First connecting rod; 52. Second connecting rod; 53. Third connecting rod; 54. Fourth connecting rod; 55. Mounting plate; 551. Mounting hole; 552. Bolt; 6. Elastic limiting mechanism; 61. Spring; 62. Limiting block; 63. Limiting rod; 64. Telescopic rod; 71. First connecting hole; 72. Second connecting hole; 73. Third connecting hole; 74. Fourth connecting hole; 75. Fifth connecting hole; 76. Sixth connecting hole; 77. Seventh connecting hole; 78. Eighth connecting hole; 79. Ninth connecting hole; 710. Tenth connecting hole; 711. Eleventh connecting hole; 712. Twelfth connecting hole; 713. Thirteenth connecting hole; 714. Fourteenth connecting hole; 81. First rivet; 82. Second rivet; 83. Third rivet; 84. Fourth rivet; 85. Fifth rivet; 86. Sixth rivet; 87. Seventh rivet; 9. Fixing block. Detailed Implementation

[0031] The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0032] refer to Figures 1-14 The above-mentioned six-bar linkage hinge limiting mechanism for a refrigerator includes: Fixing base 3, the fixing base 3 is used to connect the refrigerator body 1, the fixing base 3 is "L" shaped; Base 4, which is used to connect the refrigerator door 2; The transmission mechanism 5 includes a first connecting rod 51, a second connecting rod 52, a third connecting rod 53, a fourth connecting rod 54, and a mounting plate 55. The first end of the first connecting rod 51 is hinged to the middle part of the fixed base 3. The first end of the second connecting rod 52 is hinged to the upper end of the fixed base 3. The first end of the third connecting rod 53 is hinged to the middle part of the first connecting rod 51. The first end of the fourth connecting rod 54 is hinged to the end of the first connecting rod 51. The middle part of the fourth connecting rod 54 is hinged to the end of the second connecting rod 52. The middle part of the mounting plate 55 is hinged to the end of the third connecting rod 53. The end of the mounting plate 55 is hinged to the end of the fourth connecting rod 54. The top side of the mounting plate 55 is fixedly connected to the inner surface of the base 4. The transmission mechanism 5, the fixed base 3, and the base 4 together form a six-bar linkage, which transforms the rotational motion of the door 2 into a complex compound motion. As the angle increases, the connecting rods push each transmission arm to unfold, causing the door 2 to move outward when it opens. Compared with the traditional six-bar linkage, this invention generates a longer lateral displacement when the refrigerator is opened through the interaction between the connecting rods, so that its motion trajectory will not interfere with the inner wall of the refrigerator. At the same time, the maximum opening angle of the door 2 can reach 115°, ensuring that the drawers and shelves inside the refrigerator can be fully pulled out, making it convenient for users to store and retrieve items without compromising its overall aesthetics.

[0033] The elastic limiting mechanism 6 includes a spring 61, a limiting block 62, a limiting rod 63, and a telescopic rod 64. Two limiting blocks 62 are rotatably connected to the beginning ends of a third connecting rod 53 and a fourth connecting rod 54, respectively. Both ends of the spring 61 are fixed to adjacent sides of the two limiting blocks 62. The limiting rod 63 is fixedly connected to the inner side of one of the limiting blocks 62. One end of the telescopic rod 64 is fixedly connected to the inner side of the other limiting block 62, and the other end is slidably connected to the inner side of the limiting rod 63. The limiting mechanism in this invention has a pre-compression of 0.1mm in its initial position. It reaches maximum compression (3.8mm) when the hinge is opened to 33.8°. Afterward, the limiting mechanism begins to rebound, returning to its original state when the hinge is opened to 81.5°. This design ensures that, initially, pulling the door requires additional force to compress the spring 61. This means the door 2 will not open automatically due to external disturbances. Even if the refrigerator seal fails, the door 2 will remain tightly closed under the influence of the limiting mechanism, preventing cold air leakage. Furthermore, after a certain distance is opened, i.e., when the hinge opening angle exceeds 33.8°, the limiting mechanism assists in opening the door 2. This design allows the user to open the refrigerator door 2 to a sufficient angle simply by applying a pulling force at the beginning. During normal use, since the user is standing directly in front of the refrigerator door 2, the latter part of the door 2's movement trajectory is precisely where the user's arm is unlikely to exert force. Usually, a secondary push from the inside of the door 2 is required to fully open it. The aforementioned limiting mechanism assists in the opening process of the door, which solves this problem. At the same time, when the hinge opens to 81.5°, the elastic mechanism returns to its original state, and the limiting mechanism no longer works. The spring 61 no longer provides auxiliary pushing force. While ensuring that the door 2 opens to a sufficient angle, it can prevent the door 2 from opening too wide and colliding with other objects. Furthermore, in the final stage of closing the door 2, existing technologies suffer from insufficient self-closing force due to the reduced transmission angle and drastic decrease in mechanical strength. This results in the refrigerator's door 2 being partially closed rather than fully closed when insufficient force is applied during prolonged use. In contrast, this invention, by incorporating an elastic mechanism, actively provides a self-closing force to the refrigerator at the closing end of the door 2. Even after the refrigerator is fully closed, there remains a slight squeezing force to ensure the door 2 remains tightly closed, rather than relying solely on the magnetic attraction within the sealing strip as in existing technologies.

[0034] refer to Figure 5 In the above-mentioned six-bar hinge limiting mechanism for a refrigerator, the bottom end of the fixed base 3 is provided with a plurality of fixing holes 31, the upper end of the fixed base 3 is provided with a first connecting hole 71, and the middle part of the fixed base 3 is provided with a second connecting hole 72.

[0035] Multiple fixing holes 31 allow the fixing seat 3 to be firmly installed in the connecting groove 11 of the housing 1, which can distribute the force and improve the connection stability; the first connecting hole 71 and the second connecting hole 72 provide a precise positioning reference for the hinge of the connecting rod, ensuring that the transmission mechanism 5 is assembled accurately and moves smoothly.

[0036] refer to Figure 6In the above-mentioned hinge limiting mechanism of a refrigerator six-bar mechanism, the first connecting rod 51 has a third connecting hole 73 at its first end, a fourth connecting hole 74 in the middle part of the first connecting rod 51, and a fifth connecting hole 75 at its end. The third connecting hole 73 and the second connecting hole 72 are rotatably connected to a first rivet 81 to form a hinge connection.

[0037] Through a specific layout of connecting holes and rivet hinges, the first connecting rod 51 and the fixed seat 3 form a reliable low-friction rotating pair, which not only ensures the flexibility of movement, but also effectively improves the load-bearing capacity and transmission accuracy of the connecting rod.

[0038] refer to Figure 7 In the above-mentioned six-bar linkage limiting mechanism for a refrigerator, the first end of the second connecting rod 52 is provided with a sixth connecting hole 76, and the end of the second connecting rod 52 is provided with a seventh connecting hole 77. The sixth connecting hole 76 and the first connecting hole 71 are rotatably connected with a second rivet 82 to form a hinged connection.

[0039] The second link 52 is hinged to the upper end of the fixed base 3, which can efficiently transmit the rotational torque of the door 2 to other links. This connection method has a simple structure, is easy to assemble, and can withstand large alternating loads, thus improving the service life of the mechanism.

[0040] refer to Figure 8 The first end of the third connecting rod 53 is provided with an eighth connecting hole 78, and the last end of the third connecting rod 53 is provided with a ninth connecting hole 79. The eighth connecting hole 78 and the fourth connecting hole 74 are rotatably connected with a third rivet 83 to form a hinged connection.

[0041] The third link 53 is hinged to the middle part of the first link 51 by a rivet, so that the two links are linked. This hinge point can precisely control the swing trajectory of the third link 53, and at the same time, it plays a constraining role in the opening angle to prevent the opening angle from being too large.

[0042] refer to Figure 9 In the above-mentioned hinge limiting mechanism of a six-bar linkage for a refrigerator, the first end of the fourth link 54 is provided with a tenth connecting hole 710, the middle part of the fourth link 54 is provided with an eleventh connecting hole 711, and the end of the fourth link 54 is provided with a twelfth connecting hole 712. The tenth connecting hole 710 and the fifth connecting hole 75 are rotatably connected to a fourth rivet 84 to form a hinge connection. The eleventh connecting hole 711 and the seventh connecting hole 77 are rotatably connected to a fifth rivet 85 to form a hinge connection.

[0043] The fourth link 54 is hinged to the ends of the first link 51 and the second link 52 through multiple rivets, forming the core node of multi-link coordinated motion. It can synthesize the displacement of each link to generate the required composite motion trajectory, ensuring that the door 2 obtains sufficient lateral avoidance displacement when it is opened.

[0044] refer to Figure 10 In the above-mentioned hinge limiting mechanism of a refrigerator six-bar mechanism, the first end of the mounting plate 55 is provided with a thirteenth connecting hole 713, and the last end of the mounting plate 55 is provided with a fourteenth connecting hole 714. The thirteenth connecting hole 713 and the ninth connecting hole 79 are rotatably connected by a sixth rivet 86 to form a hinge connection. The fourteenth connecting hole 714 and the twelfth connecting hole 712 are rotatably connected by a seventh rivet 87 to form a hinge connection.

[0045] Mounting plate 55 is hinged to the ends of the third link 53 and the fourth link 54 by two rivets respectively, reliably connecting the output end of the linkage mechanism to the base 4, ensuring the synchronization of motion transmission, enabling the door 2 to open and close smoothly and accurately according to the predetermined trajectory, while enhancing the rigidity and torsional resistance of the overall mechanism.

[0046] refer to Figure 10 In the above-mentioned six-bar hinge limiting mechanism for a refrigerator, the upper end of the mounting plate 55 is provided with a plurality of mounting holes 551, and bolts 552 are threaded into the mounting holes 551.

[0047] refer to Figure 3 In the above-mentioned six-bar linkage hinge limiting mechanism for a refrigerator, the second rivet 82, the fourth rivet 84, the fifth rivet 85, the sixth rivet 86, and the seventh rivet 87 are rotatably connected to the fixing block 9 on their outer sides.

[0048] Setting rotating connection fixing blocks 9 at multiple key hinge rivets can effectively limit the axial movement of the rivets, play a limiting role, reduce rotational wear and noise, improve the centering and smoothness of movement at the hinge joints of each member, and extend the service life of the hinge mechanism.

[0049] refer to Figure 1-2 A six-bar linkage hinge limiting mechanism for a refrigerator and a refrigerator having the limiting mechanism are disclosed. The refrigerator includes a body 1 and doors 2. The body 1 is divided into a refrigeration compartment and a freezing compartment. A connecting groove 11 is provided on the outer side of the body 1. A six-bar linkage hinge limiting mechanism is fixedly installed in the connecting groove 11. Multiple doors 2 are connected to the body 1 through the six-bar linkage hinge limiting mechanism.

[0050] The working principle of this invention is as follows: Reference Figure 12-14In the initial state, the spring 61 of the elastic limiting mechanism 6 of the present invention is in a pre-compressed state with a pre-compression amount of 0.1 mm. At this time, the pre-tension provided by the spring 61 causes the two limiting blocks 62 to tend to move away from each other, thereby applying a torque to the transmission mechanism 5 through the third link 53 and the fourth link 54 to keep the door 2 closed, ensuring that the door 2 will not open on its own without external force.

[0051] When the user pulls the door 2 to open it, the door 2 moves the base 4. The base 4, through the mounting plate 55, moves the third link 53 and the fourth link 54, which in turn causes the first link 51 and the second link 52 to rotate around their respective hinge points. In the initial opening phase (0° to 33.8°), as the opening angle of the door 2 increases, the relative distance between the two limit blocks 62 gradually decreases, and the spring 61 is further compressed. During this process, the user needs to overcome the elastic force of the spring 61, so the door 2 has a certain damping feel in the initial opening phase and will not suddenly spring open due to slight disturbances. When the opening angle reaches 33.8°, the spring 61 is compressed to its maximum extent, with a compression of 3.8mm.

[0052] When the opening angle of the door 2 exceeds 33.8°, the spring 61 begins to gradually rebound from its maximum compression state, releasing energy. The rebound force of the spring 61 pushes the two limit blocks 62 away from each other, applying an auxiliary opening thrust to the transmission mechanism 5 through the third link 53 and the fourth link 54. At this time, even if the later part of the opening of the door 2 is a position where the user's arm cannot exert force, the rebound force of the spring 61 can still assist the door 2 to continue opening, allowing the user to easily open the door 2 to a larger angle without effort. When the opening angle of the door 2 reaches 81.5°, the spring 61 returns to its original length, after which the elastic limit mechanism 6 no longer provides thrust or resistance to the opening of the door 2.

[0053] As the door 2 continues to open to its maximum angle of 115°, the transmission mechanism 5 operates independently. Due to the special layout of the hinge points of each link in the transmission mechanism 5, the door 2 generates a significant outward composite motion trajectory during the opening process: initially, the door 2 moves outward horizontally, actively avoiding the side walls of the refrigerator body 1 and the obstruction of adjacent cabinets during built-in installation; as the opening angle increases, the door 2 continues to move forward smoothly and unfolds, reaching the maximum opening angle of 115°, at which point the door 2 has moved outward a sufficient distance, allowing the drawers and shelves inside the refrigerator to be fully pulled out for convenient access to items. Throughout the entire opening process, the movement trajectory of the door 2 is smooth and without jamming, and it does not collide with the refrigerator body 1 or the surrounding environment.

[0054] When the user closes door 2, the above process is reversed. During the closing process of door 2 from its maximum opening angle to 81.5°, the transmission mechanism 5 drives door 2 back along its original trajectory, and the elastic limit mechanism 6 does not participate. When door 2 closes to the range of 81.5° to 33.8°, spring 61 begins to be gradually compressed, absorbing the kinetic energy of door 2 and acting as a buffer to prevent door 2 from violently impacting the refrigerator body 1 due to excessive closing speed. When door 2 closes to the range of 33.8° to 0°, spring 61 is in a compressed state, and its rebound force is converted into torque through the transmission mechanism 5 to continue closing door 2, actively providing self-closing force to ensure door 2 can be completely closed. Even if the magnetic force inside the refrigerator seal weakens due to long-term use, the self-closing force provided by spring 61 can ensure that door 2 and refrigerator body 1 fit tightly together, preventing a "half-closed" phenomenon. When the door 2 is fully closed, the spring 61 still maintains a pre-compression of 0.1mm, continuously providing a slight squeezing force to ensure that the door 2 is always tightly closed and to prevent cold air leakage.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A hinge limiting mechanism for a six-bar linkage in a refrigerator, characterized in that, include: Fixing base (3), the fixing base (3) is used to fix and connect with the refrigerator body, the fixing base (3) is "L" shaped; Base (4), which is used to fix the refrigerator door; The transmission mechanism (5) includes a first connecting rod (51), a second connecting rod (52), a third connecting rod (53), a fourth connecting rod (54), and a mounting plate (55). The first end of the first connecting rod (51) is hinged to the middle part of the fixed base (3), the first end of the second connecting rod (52) is hinged to the upper end of the fixed base (3), the first end of the third connecting rod (53) is hinged to the middle part of the first connecting rod (51), and the first end of the fourth connecting rod (54) is hinged to the end of the first connecting rod (51); and the middle part of the fourth connecting rod (54) is hinged to the second connecting rod (55). 2) The ends of the rods are hinged to each other; the middle part of the mounting plate (55) is hinged to the end of the third link (53), and the end of the mounting plate (55) is hinged to the end of the fourth link (54). The top side of the mounting plate (55) is fixedly connected to the inner surface of the base (4). The transmission mechanism (5), the fixed seat (3) and the base (4) together form a six-bar linkage, which transforms the rotational motion of the box door (2) into a complex compound motion, so that the box door (2) generates an outward movement trajectory when it is opened, and at the same time, the maximum opening angle of the box door (2) can reach 115°. The elastic limiting mechanism (6) includes a spring (61), a limiting block (62), a limiting rod (63), and a telescopic rod (64). The two limiting blocks (62) are rotatably connected to the first ends of the third link (53) and the fourth link (54), respectively. The two ends of the spring (61) are fixed to the adjacent sides of the two limiting blocks (62), respectively. The limiting rod (63) is fixedly connected to the inside of one of the limiting blocks (62), and one end of the telescopic rod (64) is fixedly connected to the inside of the other limiting block (62), and the other end is slidably connected to the inside of the limiting rod (63). The elastic limiting mechanism (6) will provide sufficient self-closing force to the door (2) when the door (2) is closed.

2. The hinge limiting mechanism for a refrigerator six-bar linkage according to claim 1, characterized in that, The bottom end of the fixing base (3) is provided with multiple fixing holes (31), the upper end of the fixing base (3) is provided with a first connecting hole (71), and the middle part of the fixing base (3) is provided with a second connecting hole (72).

3. The hinge limiting mechanism of a refrigerator six-bar linkage according to claim 2, characterized in that, The first connecting rod (51) has a third connecting hole (73) at its head end, a fourth connecting hole (74) in the middle part of the first connecting rod (51), and a fifth connecting hole (75) at its end. The third connecting hole (73) and the second connecting hole (72) are rotatably connected to a first rivet (81) to form a hinged connection.

4. The hinge limiting mechanism of a refrigerator six-bar linkage according to claim 3, characterized in that, The first end of the second connecting rod (52) is provided with a sixth connecting hole (76), and the end of the second connecting rod (52) is provided with a seventh connecting hole (77). The sixth connecting hole (76) and the first connecting hole (71) are rotatably connected with a second rivet (82) to form a hinged connection.

5. The hinge limiting mechanism of a refrigerator six-bar linkage according to claim 4, characterized in that, The first end of the third link (53) is provided with an eighth connecting hole (78), and the last end of the third link (53) is provided with a ninth connecting hole (79). The eighth connecting hole (78) and the fourth connecting hole (74) are rotatably connected with a third rivet (83) to form a hinged connection.

6. The hinge limiting mechanism of a refrigerator six-bar linkage according to claim 5, characterized in that, The first end of the fourth link (54) is provided with a tenth connecting hole (710), the middle part of the fourth link (54) is provided with an eleventh connecting hole (711), and the end of the fourth link (54) is provided with a twelfth connecting hole (712). The tenth connecting hole (710) and the fifth connecting hole (75) are rotatably connected to a fourth rivet (84) to form a hinged connection. The eleventh connecting hole (711) and the seventh connecting hole (77) are rotatably connected to a fifth rivet (85) to form a hinged connection.

7. The hinge limiting mechanism for a refrigerator six-bar linkage according to claim 6, characterized in that, The mounting plate (55) has a thirteenth connecting hole (713) at its first end and a fourteenth connecting hole (714) at its last end. The thirteenth connecting hole (713) and the ninth connecting hole (79) are rotatably connected by a sixth rivet (86) to form a hinged connection. The fourteenth connecting hole (714) and the twelfth connecting hole (712) are rotatably connected by a seventh rivet (87) to form a hinged connection.

8. The hinge limiting mechanism of a refrigerator six-bar linkage according to claim 1, characterized in that, The mounting plate (55) has multiple mounting holes (551) at its upper end, and bolts (552) are threaded into the mounting holes (551).

9. A hinge limiting mechanism for a refrigerator six-bar linkage according to claim 7, characterized in that, The second rivet (82), the fourth rivet (84), the fifth rivet (85), the sixth rivet (86), and the seventh rivet (87) are rotatably connected to the fixing block (9) on the outside.

10. A refrigerator, characterized in that, The refrigerator includes a six-bar linkage hinge limiting mechanism as described in any one of claims 1-9. The refrigerator includes a cabinet (1) and cabinet doors (2). The cabinet (1) is divided into a refrigeration area and a freezing area. A connecting groove (11) is provided on the outer side of the cabinet (1). A six-bar linkage hinge limiting mechanism is fixedly installed in the connecting groove (11). Multiple cabinet doors (2) are connected to the cabinet (1) through the six-bar linkage hinge limiting mechanism.

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