Refrigerator door six-link rotating shaft and refrigerator

Abstract

The application discloses a refrigerator door six-rod rotating axis and a refrigerator, and relates to the technical field of household appliances. The refrigerator comprises a box body and a door body. The top end of the box body is provided with a six-rod rotating axis. The six-rod rotating axis is connected with the box body and the door body. The six-rod rotating axis comprises a box body fixing seat, a door body fixing seat and a hinge connecting rod transmission assembly. The hinge connecting rod transmission assembly comprises a first connecting rod, a second connecting rod, a third connecting rod, a fourth connecting rod, a fifth connecting rod and two fixing blocks. The application realizes the outward trajectory of the door body when the door body is opened by optimizing the spatial coordinates of the hinge connecting points of the six-rod mechanism, effectively solves the problem of door opening collision of the embedded refrigerator, realizes the reverse modulation of the mechanical benefit by optimizing the transmission angle in the closing terminal section, obtains the increasing sealing locking force, and makes the door seal completely closed. Meanwhile, the gravity of the door body is dispersed to multiple hinge connecting points, the local stress concentration is reduced, and the door body is prevented from sagging and deforming.

Description

Technical Field

[0001] This invention relates to the field of household appliance technology, and in particular to a six-bar rotating shaft for a refrigerator door and a refrigerator having the six-bar rotating shaft. Background Technology

[0002] In the high-end embedded home appliance sector, the performance of the hinge mechanism directly determines the user experience and installation compatibility of the product. As consumers increasingly demand integrated home design, refrigerator doors not only need to open at wide angles for easy access, but also require precise control of their movement trajectory during opening to accommodate extremely narrow side gaps. Currently, the mainstream high-performance solutions in the industry mainly rely on six-bar linkages, which use complex combinations of links to constrain the instantaneous center of motion of the door, thereby achieving a combined action of translational avoidance and rotational opening. Existing six-bar hinge technology, represented by products from domestic and international companies, is typically based on standard Watt-type or Stephenson-type topologies. These solutions attempt to optimize the door's movement path by arranging multiple links between the fixed base and the door connecting arm. However, after in-depth engineering analysis and practical application verification, existing technologies have significant performance bottlenecks.

[0003] The inherent defects of existing technologies are mainly reflected in the following aspects: First, the layout of their hinge points is mostly based on traditional geometric symmetry principles or empirical formulas, resulting in insufficient flexibility in the instantaneous velocity center trajectory planning of the mechanism. In the initial stage of door opening, the lateral avoidance displacement is insufficient, which easily leads to interference with the side wall of the refrigerator; while in the later stage of opening, the movement trajectory may expand excessively outward, wasting usable space. Second, existing mechanisms have obvious shortcomings in dynamic characteristics. In the final stage of door closing, due to the reduction of the transmission angle, the mechanical benefits decrease sharply, resulting in insufficient automatic closing force. For refrigerator doors that are heavy and have strong sealing strip reaction force, this can easily lead to the door not being able to lock completely, resulting in a "half-closed" phenomenon, which seriously affects refrigeration efficiency and safety. Finally, the adjustment mechanism of existing six-bar linkages often has a serious coupling effect, that is, when adjusting the door height, it will inevitably affect the front and rear depth or lateral clearance of the door, which brings great inconvenience to on-site installation and debugging, and reduces production and installation efficiency. Summary of the Invention

[0004] The purpose of this invention is to solve the problems of insufficient flexibility in the movement trajectory, insufficient sealing and locking force at the end of the closing stage, and serious coupling effect in the adjustment process of the refrigerator hinge mechanism in the prior art, and to propose a refrigerator door six-bar rotating shaft and refrigerator.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a six-bar rotating shaft for a refrigerator door, comprising: A cabinet mounting bracket, which is used to connect to the main body of the refrigerator; Door mounting bracket, which is used to connect to the refrigerator door body; A hinge linkage transmission assembly is connected between the housing fixing seat and the door fixing seat. The hinge linkage transmission assembly includes a first link, a second link, a third link, a fourth link, a fifth link, and two fixing blocks. The fixing blocks are set inside the housing fixing seat by pins. One end of the first link is hinged to the housing fixing seat and the other end is hinged to one end of the second link. The other end of the second link is hinged to the third link. One end of the fifth link is hinged to the fixing block and the other end is hinged to the middle section of the second link. The top of the third link is fixedly connected to the door fixing seat. The end of the third link is hinged to one end of the fourth link. The other end of the fourth link is hinged to the middle section of the first link. The first link to the fifth link form a six-bar linkage mechanism through their respective hinge points. The rotational movement of the door fixing seat relative to the housing fixing seat is constrained to a compound movement. The maximum opening angle of the door fixing seat reaches 115°.

[0006] In the aforementioned refrigerator door six-bar rotating shaft and refrigerator, the top of the cabinet fixing seat has several first mounting holes. A liner is installed on the inner wall of the cabinet fixing seat on the side with the first mounting holes. The liner has a third pin hole corresponding to the position of the first mounting holes. The two side walls of the cabinet fixing seat have symmetrical first pin holes. The ends of the side walls of the cabinet fixing seat have symmetrical second pin holes. Two fixing blocks are located on opposite sides of the second pin holes. A first pin is rotatably connected in the two second pin holes, and a second pin is rotatably connected in the two first pin holes.

[0007] In the aforementioned refrigerator door six-bar rotating shaft and refrigerator, a fourth pin hole and a fifth pin hole are respectively opened at both ends of the side wall of the first connecting rod, and a sixth pin hole is symmetrically opened on the side wall of the first connecting rod. The sixth pin hole is located between the fourth pin hole and the fifth pin hole. The fourth pin hole and the first pin hole are rotatably connected to a second pin to form a hinged connection. A third pin is rotatably connected in the fifth pin hole, and a fourth pin is rotatably connected in the sixth pin hole.

[0008] In the aforementioned refrigerator door six-bar rotating shaft and refrigerator, the second connecting rod has a seventh pin hole and an eighth pin hole respectively opened at both ends of its side wall. The second connecting rod has a ninth pin hole symmetrically opened on its side wall. The ninth pin hole is located between the seventh pin hole and the eighth pin hole. The seventh pin hole and the fifth pin hole are rotatably connected to a third pin to form a hinged connection. The eighth pin hole is rotatably connected to a fifth pin, and the ninth pin hole is rotatably connected to a sixth pin.

[0009] In the aforementioned refrigerator door six-bar rotating shaft and refrigerator, the middle section of the side wall of the third connecting rod is provided with a tenth pin hole, and the end of the side wall of the third connecting rod is provided with an eleventh pin hole. The tenth pin hole and the eighth pin hole are rotatably connected to the fifth pin, forming a hinged connection. The eleventh pin hole is rotatably connected to the seventh pin. The third connecting rod is connected to the top door fixing seat by bolts. The side wall of the door fixing seat is provided with multiple second mounting holes.

[0010] In the above-mentioned refrigerator door six-bar rotating shaft and refrigerator, the twelfth and thirteenth pin holes are respectively opened at both ends of the side wall of the fourth connecting rod. The twelfth pin hole and the eleventh pin hole are rotatably connected to the seventh pin to form a hinged connection. The thirteenth pin hole and the sixth pin hole are rotatably connected to the fourth pin to form a hinged connection.

[0011] In the above-mentioned refrigerator door six-bar rotating shaft and refrigerator, the five connecting rod sidewalls are respectively provided with a fourteenth pin hole and a fifteenth pin hole. The fourteenth pin hole is rotatably connected to the first pin in the fixing block and the second pin hole to form a hinged connection. The fifteenth pin hole is rotatably connected to the sixth pin in the ninth pin hole to form a hinged connection.

[0012] In the above-mentioned refrigerator door six-bar rotation axis and refrigerator, the hinge points of the first to fifth links are arranged according to preset spatial coordinates, and the door fixing seat generates an outward movement trajectory during the opening process; When the opening angle is 0°, each link of the linkage mechanism from the first link to the fifth link is in its most compact contracted state. As the opening angle increases from 0° to 115°, each link gradually unfolds. When the opening angle is 115°, each link is in its fully unfolded state.

[0013] In the above-mentioned refrigerator door six-bar rotating shaft and refrigerator, when the opening angle is 30°, the first to fifth links of the linkage mechanism begin to unfold and generate an initial lateral displacement, so that the door fixing seat avoids the side wall of the cabinet fixing seat. When the opening angle is 60°, the linkage mechanism from the first link to the fifth link reaches the middle extension position, and the door fixing seat obtains a significant forward displacement; When the opening angle is 90°, the linkage mechanism from the first link to the fifth link is in a fully extended state, and the door fixing seat opens with a quarter turn relative to the box fixing seat; The weight of the door fixing seat is distributed to multiple hinge points of the box fixing seat through the first to fifth links, reducing local stress concentration.

[0014] A refrigerator with a six-bar rotating shaft for the refrigerator door includes a cabinet and several doors. The cabinet is divided into an upper refrigeration compartment and a lower freezer compartment. The top of the cabinet has a mounting groove, and a six-bar rotating shaft is installed inside the mounting groove. The six-bar rotating shaft connects the cabinet and the doors. When the doors are opened, the six-bar linkage of the rotating shaft generates an outward movement trajectory to prevent interference between the door and the side wall of the cabinet. When the doors are closed, the six-bar linkage of the rotating shaft provides an increasing sealing and locking force, ensuring that the door seal between the door and the cabinet is completely closed.

[0015] Compared with existing technologies, the advantages of this invention are: 1. This invention utilizes a six-bar, multi-hinged-point force-distribution design to evenly distribute the weight of the door across multiple connecting rods and hinge points. A single hinge can stably support a 40kg heavy-duty refrigerator door, making it suitable for large-capacity, thick-foamed, and heavy-duty built-in refrigerators. This enhances the hinge's load-bearing limit. The multi-point force-distribution structure of the connecting rods significantly reduces stress concentration at single points, greatly reducing the maximum stress at the hinge points. Under repeated loads from long-term opening and closing, the hinge is less prone to plastic deformation, sagging, or breakage, resulting in a longer service life than traditional hinges. It is suitable for commercial-grade high-load applications.

[0016] 2. The refrigerator of this invention is equipped with a six-bar rotating axis. By optimizing the spatial coordinate layout of the five connecting rod hinge points, it completely changes the traditional single rotational motion mode of hinges, allowing the refrigerator door to form a unique outward composite motion trajectory when it opens. In the initial stage of door opening, the six-bar rotating axis structure can achieve lateral outward movement of the door within a 30° opening range, actively avoiding obstruction from the side wall of the refrigerator and adjacent cabinets. As the opening angle increases to 60° and 90°, the door continues to move forward smoothly and unfolds, with a maximum opening angle of up to 115°. The entire opening process is smooth and without any jamming or bumping, which not only protects the refrigerator and cabinet structure, but also allows the internal drawers and shelves to be fully pulled out, greatly improving the usability and convenience of retrieval of built-in refrigerators.

[0017] 3. This invention achieves reverse modulation of mechanical benefits by optimizing the transmission angle at the end of the closing phase through the six-bar rotating shaft, so that the closing force increases as the door approaches the closed position, and the door obtains an increasing sealing and locking force at the end of the closing phase, so that the door seal between the door and the box is completely closed, effectively solving the problem of the door being partially closed and unable to be fully locked in the prior art.

[0018] 4. Compared with traditional single-axis hinges, the six-bar rotating axis of this invention distributes the weight of the door to multiple hinge points, effectively preventing the door from sagging and deforming after long-term use, and improving the overall rigidity and fatigue resistance of the hinge.

[0019] 5. The six-bar linkage of this invention eliminates dead points and rigid impacts during movement through the spatial coordinate layout of the hinge points, resulting in a uniform force distribution at each hinge point, significantly reducing the wear rate, and improving the reliability and ease of installation of the product. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of a refrigerator including a six-bar rotating axis for the refrigerator door, as proposed in this invention. Figure 2 This is a schematic diagram of the overall structure of a refrigerator, including the six rotating shafts of the refrigerator door, from another perspective, as proposed in this invention. Figure 3 for Figure 2 A magnified structural diagram of part A in the middle; Figure 4 This is a schematic diagram of the overall structure of the six-bar rotating shaft of a refrigerator door proposed in this invention; Figure 5 This is an exploded view of the structure of the six-bar rotating shaft of a refrigerator door proposed in this invention; Figure 6 This is an exploded view of the structure of a refrigerator door six-bar rotation axis proposed in this invention from another perspective; Figure 7 This is a schematic diagram of the initial position of the six-bar rotation axis of a refrigerator door according to the present invention. Figure 8 This is a schematic diagram of a cross-sectional structure of the opening 30° position of the six-bar rotating axis of a refrigerator door, as proposed in this invention. Figure 9 This is a schematic cross-sectional view of the 60° opening position of the six-bar rotation axis of a refrigerator door, as proposed in this invention. Figure 10 This is a schematic diagram of the cross-sectional structure of the six-bar rotating shaft of a refrigerator door at the 90° opening position, as proposed in this invention. Figure 11 This is a schematic diagram of the cross-sectional structure of the six-bar rotation axis of a refrigerator door at the maximum angle of 115°, as proposed in this invention.

[0021] In the diagram: 1. Box body; 2. Door body; 3. Box body mounting base; 301. First mounting hole; 302. First pin hole; 303. Second pin hole; 4. Door body mounting base; 401. Second mounting hole; 5. First connecting rod; 501. Fourth pin hole; 502. Fifth pin hole; 503. Sixth pin hole; 6. Second connecting rod; 601. Seventh pin hole; 602. Eighth pin hole; 603. Ninth pin hole; 7. Third connecting rod; 701. 702, 703, 704, 705, 706, 707, 708, 709, 70 ... Detailed Implementation

[0022] The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0023] Example: Refer to Figures 1-11 A refrigerator with a six-bar rotating shaft for the refrigerator door includes a cabinet 1 and several doors 2. The cabinet 1 is divided into an upper refrigeration compartment and a lower freezer compartment, which can achieve separate refrigeration and freezing. A mounting groove is provided at the top of the cabinet 1, and a six-bar rotating shaft structure is fixedly installed inside the mounting groove. This dedicated six-bar rotating shaft enables the rotational connection between the cabinet 1 and the doors 2. Relying on the special six-bar linkage structure of the six-bar rotating shaft, the doors 2 can generate a dedicated outward movement trajectory during opening, effectively avoiding interference and collisions between the doors 2 and the side walls of the cabinet 1 or surrounding built-in cabinets. At the final closing stage, the doors 2 obtain increasing sealing and locking force through the six-bar linkage mechanism of the refrigerator door's six-bar rotating shaft, ensuring complete closure of the door seal between the doors 2 and the cabinet 1.

[0024] A six-bar rotating shaft for a refrigerator door mainly consists of a cabinet fixing seat 3, a door fixing seat 4, and a hinge linkage transmission assembly. The overall structure is precisely fitted and the transmission is stable. The cabinet fixing seat 3 is used to connect to the refrigerator cabinet 1, and the door fixing seat 4 is used to connect to the refrigerator door 2. The hinge linkage transmission assembly is assembled and connected between the cabinet fixing seat 3 and the door fixing seat 4, specifically including a first link 5, a second link 6, a third link 7, a fourth link 8, a fifth link 9, and two fixing blocks 10. The fixing blocks 10 are set inside the cabinet fixing seat 3 by pins. One end of the first link 5 is hinged to the cabinet fixing seat 3, and the other end is hinged to one end of the second link 6. The other end of the second link 6 is hinged to the third link 5. 7. The fifth link 9 is hinged at one end to the fixed block 10 and at the other end to the middle section of the second link 6. The top of the third link 7 is fixedly connected to the door fixing seat 4. The end of the third link 7 away from the second link 6 is hinged to one end of the fourth link 8. The other end of the fourth link 8 is hinged to the middle section of the first link 5. The first link 5 to the fifth link 9 form a six-bar linkage through their respective hinge points. Through the precise hinged cooperation of the above multi-link linkages, the first link 5 to the fifth link 9 together constitute a complete six-bar linkage, which constrains the single rotational motion of the door fixing seat 4 relative to the box fixing seat 3 into a compound motion trajectory. This can achieve a maximum opening angle of 115° for the door fixing seat 4, which is far superior to the traditional hinge structure.

[0025] The top of the housing mounting base 3 has several first mounting holes 301. A liner 11 is installed on the inner wall of the housing mounting base 3 on the side with the first mounting holes 301. The liner 11 has a third pin hole 111 corresponding to the position of the first mounting holes 301. The two side walls of the housing mounting base 3 have symmetrical first pin holes 302. The ends of the side walls of the housing mounting base 3 have symmetrical second pin holes 303. Two fixing blocks 10 are located on opposite sides of the second pin holes 303. The two second pin holes 303 are rotatably connected to the first pin holes 303. The two first pin holes 302 are rotatably connected to the second pin holes 13. The multiple sets of pin holes and pins rotatably connected ensure that the mechanism is subjected to balanced force and operates stably.

[0026] The first connecting rod 5 has a fourth pin hole 501 and a fifth pin hole 502 at both ends of its side wall. The first connecting rod 5 also has a sixth pin hole 503 symmetrically located between the fourth pin hole 501 and the fifth pin hole 502. The fourth pin hole 501 and the first pin hole 502 are rotatably connected to the second pin 13, forming a hinged connection. The fifth pin hole 502 is rotatably connected to the third pin 14, and the sixth pin hole 503 is rotatably connected to the fourth pin 15. The first connecting rod 5 achieves precise transmission and angle adjustment through multi-point hinge.

[0027] The second connecting rod 6 has a seventh pin hole 601 and an eighth pin hole 602 at both ends of its side wall. The second connecting rod 6 also has a ninth pin hole 603 symmetrically located between the seventh pin hole 601 and the eighth pin hole 602. The seventh pin hole 601 and the fifth pin hole 502 are rotatably connected to the third pin 14, which enables the second connecting rod 6 to be hinged to the first connecting rod 5, ensuring that the second connecting rod 6 can be smoothly transmitted synchronously with the overall mechanism. The eighth pin hole 602 is rotatably connected to the fifth pin 16, and the ninth pin hole 603 is rotatably connected to the sixth pin 17.

[0028] The third link 7 has a tenth pin hole 701 in the middle section of its side wall and an eleventh pin hole 702 at its end. The tenth pin hole 701 and the eighth pin hole 602 are rotatably connected to the fifth pin 16 to form a hinged connection. The eleventh pin hole 702 is rotatably connected to the seventh pin 18. The third link 7 is connected to the top door fixing seat 4 by bolts. The side wall of the door fixing seat 4 has multiple second mounting holes 401, which can be stably assembled and fixed with the refrigerator door 2 to achieve precise transmission of the link movement to the door opening and closing action.

[0029] The fourth link 8 has a twelfth pin hole 801 and a thirteenth pin hole 802 at both ends of its side wall. The twelfth pin hole 801 and the eleventh pin hole 702 are rotatably connected to the seventh pin 18 to form a hinged connection. The thirteenth pin hole 802 and the sixth pin hole 503 are rotatably connected to the fourth pin 15 to complete the overall assembly of the fourth link 8 and improve the six-link closed-loop transmission structure.

[0030] The five-link 9 has a fourteenth pin hole 901 and a fifteenth pin hole 902 at both ends of its side wall. The fourteenth pin hole 901 is rotatably connected to the first pin 12 in the fixed block 10 and the second pin hole 303, forming a hinge connection. The fifteenth pin hole 902 is rotatably connected to the sixth pin 17 in the ninth pin hole 603. Through multi-point linkage, the entire linkage mechanism is ensured to move synchronously and in coordination.

[0031] This mechanism precisely optimizes the spatial coordinate layout of the hinge points of the first to fifth links 5, allowing the door fixing seat 4 to form a controllable outward composite trajectory throughout the entire opening process, thus solving the problem of interference when opening small gaps in embedded refrigerators from a structural perspective. The entire six-bar linkage has a regular telescoping and unfolding characteristic. When the door is closed at an opening angle of 0°, the first to fifth links 9 are in their most compact contracted state, with each link tightly fitted and arranged, occupying minimal space and achieving the best door sealing and pressing effect. As the opening angle gradually increases from 0° to 115°, each link unfolds in an orderly and gradual manner. When the opening angle reaches its maximum stroke of 115°, all links are fully unfolded, achieving an ultra-large opening angle effect.

[0032] Reference Figure 7 This is a cross-sectional view of the six-bar linkage mechanism at its initial position of 0°. With the door closed, links 5 through 9 are in their most compact contracted state, with all links closely aligned. The door mounting base 4 and the cabinet mounting base 3 are in their closest position, and the door seal is fully compressed. At this time, the links are close together, occupying a relatively small space.

[0033] Reference Figure 8 This is a cross-sectional schematic diagram of the six-bar linkage mechanism at the 30° opening position. When the door begins to open and the opening angle reaches 30°, the second link 6 and the third link 7 begin to unfold and generate an initial lateral displacement, causing the door fixing seat 4 to avoid the side wall of the box fixing seat 3. In the initial stage of opening, the six-bar mechanism drives the door fixing seat 4 to move laterally away from the box fixing seat 3, generating an outward movement trajectory to avoid interference between the door and the box side wall.

[0034] Reference Figure 9 This is a cross-sectional view of the six-bar linkage mechanism at the 60° opening position. When the opening angle reaches 60°, the first link 5 and the third link 7 reach their intermediate extended positions, and the door fixing seat 4 experiences significant forward displacement. The links further extend, and the door moves smoothly along the optimized motion trajectory, resulting in a smooth and seamless opening process.

[0035] Reference Figure 10 This is a cross-sectional view of the six-bar hinge mechanism at the 90° open position. When the opening angle reaches 90°, the first to fifth links 5 are fully extended, and the door fixing seat 4 opens with a quarter turn relative to the cabinet fixing seat 3. The door is now completely away from the cabinet side wall and adjacent cabinets, allowing the drawers and shelves inside the refrigerator to be fully pulled out.

[0036] Reference Figure 11 This is a cross-sectional view of the six-bar linkage mechanism at its maximum opening angle of 115°. When the opening angle reaches 115°, links 5 to 9 are fully extended, and the door mounting base 4 reaches its maximum opening angle. This angle is significantly greater than that achievable with a traditional four-bar hinge, greatly improving the convenience for users to access items.

[0037] The design of the thickness of each link, hinge point, and pin on the six-bar rotating axis significantly improves the overall load-bearing capacity of the mechanism, enabling it to stably support a door weighing up to 40kg. Compared to traditional hinges, this structure is suitable for heavy refrigerator doors with multi-layered glass panels and built-in large shelves. Even under long-term, high-frequency opening and closing conditions, it can still keep the door from sagging and the connection from loosening, significantly extending the service life of the refrigerator and expanding the product's applicability.

[0038] In this invention, a refrigerator including a six-bar rotating shaft for the refrigerator door consists of a cabinet 1 and four doors 2. The cabinet 1 is equipped with refrigeration elements and dividers. The internal integrated elements control the upper layer to refrigerate and the lower layer to freeze. The four doors 2 are connected to the outside of the cabinet 1 and are rotatably connected along the edge of the cabinet 1. They are connected by a six-bar rotating shaft for high-strength rotation. The six-bar rotating shaft has a rated load capacity of up to 40kg, which is suitable for connecting the cabinet 1 and the doors 2 of a high-quality refrigerator.

[0039] The six-bar rotating shaft is composed of multiple connecting rods. Before installation, a groove is made in the housing 1. The housing fixing seat 3 is inserted into the groove and bolted in place. The liner 11 is placed on the inner wall of the housing fixing seat 3. The fixing bolts pass through the third pin hole 111 and the first mounting hole 301 and are threaded onto the housing 1. The housing fixing seat 3 and the housing 1 are then installed. The linkage mechanism is then assembled. The fourth pin hole 501 of the first connecting rod 5 is aligned with the first pin hole 302 of the housing fixing seat 3, and the second pin 13 is inserted into it. Then, the fifth pin hole 502 of the first connecting rod 5 is aligned with the seventh pin hole 601 of the second connecting rod 6, and the third pin 14 is inserted into it.

[0040] The fixing block 10 is placed on the side wall opposite to the second pin hole 303. The fourteenth pin hole 901 of the fifth link 9 is aligned with the fixing block 10 and the second pin hole 303, and the first pin 12 is inserted. Then, the second link 6 is rotated so that the fifteenth pin hole 902 of the fifth link 9 is aligned with the ninth pin hole 603 of the second link 6, and the sixth pin 17 is inserted therein.

[0041] Align the eighth pin hole 602 of the second link 6 with the tenth pin hole 701 of the third link 7, and insert the fifth pin 16 into them. The top of the third link 7 is fixedly connected to the door body fixing seat 4 by bolts. The fixing bolts pass through the second mounting hole 401 on the side wall of the door body fixing seat 4 and are inserted into the door body 2 for fixed connection.

[0042] Align the eleventh pin hole 702 of the third link 7 with the twelfth pin hole 801 of the fourth link 8, and insert the seventh pin 18 into them.

[0043] Adjust the rotation angle of the third link 7 so that the thirteenth pin hole 802 at the other end of the fourth link 8 is aligned with the sixth pin hole 503 of the first link 5, and insert the fourth pin 15 into it. This completes the assembly of the six-bar rotating shaft of the door. It should be noted that the six-bar rotating shaft can be assembled in advance before the formal installation of the box body 1 and the door body 2. In actual use, it is only necessary to connect the box body fixing seat 3 and the door body fixing seat 4 to the box body 1 and the door body 2 respectively.

[0044] The hinge points of the first to fifth links 9 of the six-bar rotating axis are arranged according to preset spatial coordinates, causing the door fixing seat 4 to move outward during opening. Initially, the door fixing seat 4 moves laterally away from the cabinet fixing seat 3 before opening along the rotational trajectory, effectively solving the problem of bumping when opening the door of an embedded refrigerator with minimal side clearance. The final closing stage of the door fixing seat 4 achieves reverse modulation of mechanical benefits through optimized transmission angle. During closing, as the door fixing seat 4 approaches the closed position, the transmission angle gradually increases, resulting in an increasing closing force. This provides the door 2 with an increasing sealing and locking force, ensuring complete closure of the door seal between the door 2 and the cabinet 1, effectively solving the problem of the door being partially ajar and unable to fully lock in existing technologies.

[0045] Furthermore, the weight of the door fixing seat 4 is distributed to multiple hinge points of the box fixing seat 3 through the first link 5 to the fifth link 9, effectively reducing local stress concentration and preventing sagging deformation of the door after long-term use. The spatial coordinate layout of the six-bar rotation axis through the hinge points eliminates dead points and rigid impacts during the movement, making the force on each hinge point evenly distributed and significantly reducing the wear rate.

[0046] The refrigerator door's six-bar rotating shaft has a mounting base 3 connected to the refrigerator body 1, and a door mounting base 4 connected to the refrigerator door's six-bar rotating shaft to the door body 2. The door body 2 opens and closes relative to the refrigerator body 1 within a range of 0° to 115° via the refrigerator door's six-bar rotating shaft. The refrigerator is a built-in refrigerator, and the side gap between the refrigerator body 1 and the adjacent cabinet is small. When the door body 2 opens, it moves outward via the six-bar linkage mechanism of the refrigerator door's six-bar rotating shaft. In the initial opening stage, it moves laterally away from the refrigerator body 1 to avoid interference with the side wall of the refrigerator body 1. In the final closing stage, the door body 2 obtains an increasing sealing and locking force through the mechanical reverse modulation of the linkage mechanism of the refrigerator door's six-bar rotating shaft, ensuring that the door seal between the door body 2 and the refrigerator body 1 is completely closed, guaranteeing the refrigerator's cooling efficiency and safety.

[0047] 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 six-bar rotating shaft for a refrigerator door, characterized in that, include: Box fixing seat (3), the box fixing seat (3) is used to connect to the main body of the refrigerator; Door fixing seat (4), the door fixing seat (4) is used to connect with the refrigerator door body; A hinge linkage transmission assembly is connected between the housing fixing seat (3) and the door fixing seat (4). The hinge linkage transmission assembly includes a first link (5), a second link (6), a third link (7), a fourth link (8), a fifth link (9), and two fixing blocks (10). The fixing blocks (10) are set inside the housing fixing seat (3) by pins. One end of the first link (5) is hinged to the housing fixing seat (3), and the other end is hinged to one end of the second link (6). The other end of the second link (6) is hinged to the third link (7). One end of the fifth link (9) is hinged to the third link (7). One end is hinged to the fixed block (10) and the other end is hinged to the middle section of the second link (6). The top of the third link (7) is fixedly connected to the door body fixing seat (4). The end of the third link (7) is hinged to one end of the fourth link (8). The other end of the fourth link (8) is hinged to the middle section of the first link (5). The first link (5) to the fifth link (9) form a six-bar linkage through their respective hinge points. The rotational motion of the door body fixing seat (4) relative to the box body fixing seat (3) is constrained to a compound motion. The maximum opening angle of the door body fixing seat (4) reaches 115°. The hinge points of the first link (5) to the fifth link (9) are arranged according to the preset spatial coordinates, and the door fixing seat (4) generates an outward trajectory during the opening process; When the opening angle is 0°, each link of the first link (5) to the fifth link (9) is in the most compact contracted state. As the opening angle increases from 0° to 115°, each link of the first link (5) to the fifth link (9) gradually unfolds. When the opening angle is 115°, each link is in the fully unfolded state. When the opening angle of the linkage mechanism of the first link (5) to the fifth link (9) is 30°, the first link (5) to the fifth link (9) begins to unfold and generate an initial lateral displacement, so that the door fixing seat (4) avoids the side wall of the box fixing seat (3); When the opening angle of the linkage mechanism of the first link (5) to the fifth link (9) is 60°, the first link (5) to the fifth link (9) reach the middle extension position, and the door fixing seat (4) obtains a significant forward displacement; When the opening angle of the linkage mechanism of the first link (5) to the fifth link (9) is 90°, the first link (5) to the fifth link (9) is in a large-scale unfolded state, and the door fixing seat (4) is opened by a quarter turn relative to the box fixing seat (3); The weight of the door fixing seat (4) is distributed to multiple hinge points of the box fixing seat (3) through the first link (5) to the fifth link (9) to reduce local stress concentration.

2. The refrigerator door six-bar rotating shaft according to claim 1, characterized in that, The top of the box fixing base (3) has several first mounting holes (301). A liner (11) is installed on the inner wall of the side of the box fixing base (3) with the first mounting holes (301). The liner (11) has a third pin hole (111) corresponding to the position of the first mounting holes (301). The two side walls of the box fixing base (3) are symmetrically provided with first pin holes (302). The end of the side wall of the box fixing base (3) is symmetrically provided with second pin holes (303). The two fixing blocks (10) are located on opposite sides of the second pin holes (303). The two second pin holes (303) are rotatably connected with first pins (12). The two first pin holes (302) are rotatably connected with second pins (13).

3. A refrigerator door six-bar rotating shaft according to claim 2, characterized in that, The first connecting rod (5) has a fourth pin hole (501) and a fifth pin hole (502) respectively opened at both ends of its side wall. The first connecting rod (5) has a sixth pin hole (503) symmetrically opened on its side wall. The sixth pin hole (503) is located between the fourth pin hole (501) and the fifth pin hole (502). The fourth pin hole (501) and the first pin hole (302) are rotatably connected to the second pin (13) to form a hinge connection. The fifth pin hole (502) is rotatably connected to the third pin (14), and the sixth pin hole (503) is rotatably connected to the fourth pin (15).

4. A refrigerator door six-bar rotating shaft according to claim 3, characterized in that, The second connecting rod (6) has a seventh pin hole (601) and an eighth pin hole (602) respectively opened at both ends of its side wall. The second connecting rod (6) has a ninth pin hole (603) symmetrically opened on its side wall. The ninth pin hole (603) is located between the seventh pin hole (601) and the eighth pin hole (602). The seventh pin hole (601) and the fifth pin hole (502) are rotatably connected to the third pin (14) to form a hinge connection. The eighth pin hole (602) is rotatably connected to the fifth pin (16), and the ninth pin hole (603) is rotatably connected to the sixth pin (17).

5. A refrigerator door six-bar rotating shaft according to claim 4, characterized in that, The third link (7) has a tenth pin hole (701) in the middle section of its side wall and an eleventh pin hole (702) at the end of its side wall. The tenth pin hole (701) and the eighth pin hole (602) are rotatably connected to the fifth pin (16) to form a hinged connection. The eleventh pin hole (702) is rotatably connected to the seventh pin (18). The third link (7) is connected to the top door fixing seat (4) by bolts. The side wall of the door fixing seat (4) has multiple second mounting holes (401).

6. A refrigerator door six-bar rotating shaft according to claim 5, characterized in that, The fourth link (8) has a twelfth pin hole (801) and a thirteenth pin hole (802) at both ends of its side wall. The twelfth pin hole (801) and the eleventh pin hole (702) are rotatably connected to the seventh pin (18) to form a hinged connection. The thirteenth pin hole (802) and the sixth pin hole (503) are rotatably connected to the fourth pin (15) to form a hinged connection.

7. A refrigerator door six-bar rotating shaft according to claim 6, characterized in that, The five connecting rod (9) has a fourteenth pin hole (901) and a fifteenth pin hole (902) at both ends of its side wall. The fourteenth pin hole (901) is rotatably connected to the first pin (12) in the fixing block (10) and the second pin hole (303) to form a hinged connection. The fifteenth pin hole (902) is rotatably connected to the sixth pin (17) in the ninth pin hole (603) to form a hinged connection.

8. A refrigerator comprising a six-bar rotating shaft for the refrigerator door as described in any one of claims 1-7, comprising a cabinet (1) and a plurality of doors (2), characterized in that, The cabinet (1) is divided into an upper refrigeration area and a lower freezing area. The top of the cabinet (1) has an installation groove and a six-bar rotating shaft is installed inside the installation groove. The six-bar rotating shaft connects the cabinet (1) and the door (2). When the door (2) is opened, the six-bar linkage of the six-bar rotating shaft generates an outward trajectory to avoid interference between the door (2) and the side wall of the cabinet (1). When the door (2) is closed, it obtains an increasing sealing and locking force through the six-bar linkage of the six-bar rotating shaft of the refrigerator door, so that the door seal between the door (2) and the cabinet (1) is completely closed.

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