Automatic return hinge device for refrigerator door

Abstract

An automatic return hinge device for a refrigerator door comprises a shell, a rotating shaft arranged in the shell, a hinge seat matched with the rotating shaft, a spring seat and a spring, a shaft core is formed in the middle of the rotating shaft, a hinge seat shaft is formed on one side of the hinge seat, and the shaft core is arranged in a shaft core hole of the hinge seat shaft. The rotating shaft is characterized in that a guide bump is formed at the joint of the rotating shaft body and the shaft core in a semi-surrounding mode, a guide groove matched with the guide bump is formed in the hinge seat body, a guide bump friction inclined plane is formed on the side, facing the hinge seat, of the guide bump, and a hinge seat friction inclined plane is formed on the side, facing the guide bump, of the hinge seat. The guide protruding block friction inclined face and the hinge seat friction inclined face are attached and slide in a matched mode, a rotating shaft arc face is formed between the guide protruding block friction inclined face and the circumferential face of the rotating shaft, and a hinge seat shaft arc face is formed between the hinge seat friction inclined face and the circumferential face of the hinge seat shaft. The refrigerator has the advantages that chippings are prevented from being generated, the service life of the refrigerator is prolonged, and abnormal sound cannot be generated in use.

Description

Technical Field

[0001] The utility model belongs to the technical field of kitchen appliances, and in particular relates to an automatic return hinge device for a refrigerator door. Background Art

[0002] Refrigerators are one of the indispensable electrical appliances in people's daily life, and they mainly play the role of refrigeration and heat preservation. At present, the development of refrigerators tends to energy conservation and emission reduction. Energy conservation not only depends on reducing energy consumption by the refrigeration system, but also makes the refrigerator more heat-insulated to reduce the working time of the refrigeration system. However, when the refrigerator door is opened, heat exchange occurs with the outside world, and the temperature inside the refrigerator rises rapidly. Some users often forget to close the refrigerator door. If it is not discovered for a long time, not only will the food in the refrigerator deteriorate, but the refrigeration system will also be in working state at all times, thus wasting a lot of energy. Therefore, some hinges that can automatically close the opened refrigerator door have appeared in the industry, but after long-term use, it is found that the rotating shaft and the hinge seat that cooperate with each other often produce a lot of debris due to mutual wear. The debris will make the door body unable to close tightly and greatly shorten the service life of the refrigerator. However, if metal parts are used to rotate together, noise will be generated, and rust will occur after long-term use, which also cannot meet the needs of consumers. After careful observation of the above problem, the applicant found that both the rotating shaft and the articulated seat have inclined surfaces that cooperate and guide each other, and the debris generated by friction mostly comes from the chamfers of the inclined surfaces and their respective components, and because the friction surfaces in contact with each other are worn, the chamfers will gradually approach the other rotating component and cause obstruction during the rotation process, and the obstructions will rub and collide with each other. This friction and collision is different from the wear between general friction surfaces, because the friction between general friction surfaces is flat friction that is close to each other, and the friction, wear and debris generated are negligible, while the friction and collision between obstructions will cause deformation, which can easily produce a large amount of granular debris.

[0003] In the prior art, as disclosed in the Chinese utility model authorization announcement number CN200968758Y, "an automatic closing structure for a large refrigerator door" includes a connecting piece and a hinge shaft, the hinge shaft is connected to the connecting piece, the door body automatic closing structure is arranged above and / or below the door body, the connecting piece has a rectangular structure, a first supporting wall with a through hole in the center, and a second supporting wall, a hinge shaft is arranged in the through hole, one end of the hinge shaft passes through the through hole, the other end of the hinge shaft is sequentially sleeved with a hinge and a spring, and finally one end of the spring is positioned and fixed by a spring plug. It adopts the structure of the above-mentioned inclined plane matching between the hinge shaft and the hinge, so it is easy to generate a lot of debris, thereby affecting the service life of the refrigerator.

[0004] In view of the above situation, it is necessary to design a refrigerator door automatic return hinge device with simple structure and greatly prolonging the service life of the rotating parts. To this end, the applicant has made a useful design, and the technical solution to be introduced below is produced under this background. Utility Model Content

[0005] The task of the utility model is to provide an automatic return hinge device for a refrigerator door, which helps to improve the rotation matching structure of the rotating shaft and the hinge seat so that the two will not cause mutual obstruction in local positions after long-term use, avoid the generation of a large amount of debris, thereby ensuring the normal use of the hinge, which is beneficial to extending the service life of the refrigerator.

[0006] The task of the utility model is accomplished in this way. An automatic return hinge device for a refrigerator door comprises a shell, a rotating shaft arranged in the shell and located at one end of the shell, a hinge seat arranged in the shell and matched with the rotating shaft, a spring seat arranged in the shell and fixed at the other end of the shell, and a spring arranged between the hinge seat and the spring seat. The rotating shaft is formed with an axis core in the middle part facing the hinge seat, and the hinge seat is formed with an articulated seat shaft on the side facing the rotating shaft. The articulated seat shaft is provided with an axis core hole that runs through the length direction of the articulated seat at a position corresponding to the axis core. The axis core is rotatably arranged in the axis core hole. The characteristic is that the rotating shaft body is in contact with the axis core. The connection is semi-enclosed to form a guide protrusion, and the articulated seat body is formed with a guide groove that fits with the guide protrusion at the installation position corresponding to the guide protrusion, and a guide protrusion friction slope is formed at a position of the guide protrusion facing the side of the articulated seat and close to the shaft core hole, and a articulated seat friction slope is formed at a position of the articulated seat facing the side of the guide protrusion and corresponding to the guide protrusion friction slope, the guide protrusion friction slope and the articulated seat friction slope are tightly fitted and slid in cooperation, a rotating shaft arc surface is formed between the guide protrusion friction slope and the circumferential surface of the rotating shaft, and an articulated seat shaft arc surface is formed between the articulated seat friction slope and the circumferential surface of the articulated seat shaft.

[0007] In a specific embodiment of the present utility model, a guide protrusion friction plane connected with the guide protrusion friction inclined surface is formed at the connection between the rotating shaft body and the shaft core, and a rotating shaft connecting arc surface connected with the rotating shaft arc surface is formed between the guide protrusion friction plane and the circumferential surface of the rotating shaft; the articulated seat shaft body is formed with an articulated seat friction plane connected with the articulated seat friction inclined surface at a position relative to the guide protrusion friction plane, and an articulated seat shaft connecting arc surface connected with the articulated seat shaft arc surface is formed between the articulated seat friction plane and the circumferential surface of the articulated seat shaft.

[0008] In another specific embodiment of the utility model, the middle of the shell is formed with a shell cavity opening toward one end, and the other end of the shell is provided with a door axis hole opposite to the rotating axis, and the door axis hole is communicated with the shell cavity; the shell is formed with a shell fixing plate vertically upward at the end where the door axis hole is provided, and a group of fixing holes are provided on the shell fixing plate.

[0009] In another specific embodiment of the present utility model, a square hole is opened on the end surface of the rotating shaft away from the axis core, and the square hole is arranged opposite to the door axis hole.

[0010] In another specific embodiment of the present invention, an end of the articulated seat away from the rotating axis is formed with an articulated seat spring connecting column, one end of the spring seat is formed with a spring seat connecting column, and the two ends of the spring are respectively mounted on the articulated seat spring connecting column and the spring seat connecting column.

[0011] In another specific embodiment of the utility model, the spring seat is provided with a spring seat fixing groove on a side surface away from the spring seat connecting column, and a plug plate is arranged in the spring seat fixing groove; the shell is provided with a pair of plug plate holes at the installation position corresponding to the plug plate, and the plug plate is inserted between the two plug plate holes and is located in the spring seat fixing groove, so as to limit the spring seat from falling off from the shell.

[0012] In a further specific embodiment of the present invention, the rotating shaft and the hinge seat are made of nylon.

[0013] After the utility model adopts the above structure, it has the beneficial effect: due to the close matching structure between the rotating friction inclined surface and the arc surface structure formed between the rotating friction inclined surface and the circumferential surface of the component between the rotating shaft and the hinge seat, the two will not cause mutual obstruction at local positions after being used together for a long time, avoiding the large amount of debris generated by friction and impact in the prior art to affect the normal use of the hinge, thereby effectively extending the service life of the refrigerator, and the hinge device will not produce abnormal noise during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a three-dimensional structure explosion diagram of an embodiment of the utility model;

[0015] Figure 2 It is a schematic diagram of the planar structure of the cooperation between the rotating shaft and the hinge seat of the utility model;

[0016] Figure 3 It is a structural schematic diagram of an application example of the utility model.

[0017] In the figure: 1. shell, 11. shell cavity, 12. shell fixing plate, 121. fixed installation hole, 13. door shaft hole, 14. plug plate hole; 2. rotating shaft, 21. shaft core, 22. square hole, 23. guide protrusion, 25. rotating shaft arc surface, 251. rotating shaft connection arc surface, 26. guide protrusion friction inclined surface, 261. guide protrusion friction plane; 3. hinge seat, 31. hinge seat shaft, 32. hinge seat spring connecting column, 33. shaft core hole, 34. hinge seat shaft arc surface, 341. hinge seat shaft connection arc surface, 35. guide groove, 36. hinge seat friction inclined surface, 361. hinge seat friction plane; 4. spring seat, 41. spring seat fixing groove, 42. spring seat connecting column, 43. plug plate; 5. spring; 6. refrigerator door. DETAILED DESCRIPTION

[0018] The specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings, but the description of the embodiments is not a limitation of the technical solution. Any changes in form rather than substance based on the concept of the present invention should be regarded as the protection scope of the present invention.

[0019] In the following description, all concepts related to up, down, left, right, front and back directions or orientations are based on Figure 1 The positions shown are for reference only and thus cannot be understood as a special limitation on the technical solution provided by the present utility model.

[0020] See also Figure 1 Combined with Figure 2 The utility model relates to an automatic return hinge device for a refrigerator door, comprising a housing 1, a rotating shaft 2 arranged in the housing 1 and located at one end of the housing 1, a hinge seat 3 arranged in the housing 1 and matched with the rotating shaft 2, a spring seat 4 arranged in the housing 1 and fixed at the other end of the housing 1, and a spring 5 arranged between the hinge seat 3 and the spring seat 4. The rotating shaft 2 is provided with an axis core 21 in the middle part facing the hinge seat 3, and the hinge seat 3 is provided with an axis core shaft 31 on the side facing the rotating shaft 2. The hinge seat shaft 31 is provided with an axis core hole 33 that runs through the length direction of the hinge seat 3 at a position corresponding to the axis core 21, and the axis core 21 is rotatably arranged in the axis core hole 33. The material of the rotating shaft 2 and the hinge seat 3 is not subject to any restrictions, and nylon is preferably used in this embodiment.

[0021] As the technical highlights of the utility model: the aforementioned rotating shaft 2 body is semi-enclosed at the connection with the shaft core 21 to form a guide protrusion 23, the aforementioned articulated seat 3 body is formed with a guide groove 35 that fits with the guide protrusion 23 at the installation position corresponding to the guide protrusion 23, the aforementioned guide protrusion 23 is formed with a guide protrusion friction slope 26 at a position facing the side of the articulated seat 3 and close to the shaft core hole 33, the aforementioned articulated seat 3 is formed with a articulated seat friction slope 36 at a position facing the side of the guide protrusion 23 and corresponding to the guide protrusion friction slope 26, the aforementioned guide protrusion friction slope 26 and the articulated seat friction slope 36 are tightly fitted with each other and slide in cooperation, a rotating shaft arc surface 25 is formed between the aforementioned guide protrusion friction slope 26 and the circumferential surface of the rotating shaft 2, and an articulated seat shaft arc surface 34 is formed between the aforementioned articulated seat friction slope 36 and the circumferential surface of the articulated seat shaft 31.

[0022] In this embodiment, the connection between the rotating shaft 2 body and the shaft core 21 is formed with a guide protrusion friction plane 261 connected with the guide protrusion friction slope 26, and a rotating shaft connecting arc surface 251 connected with the rotating shaft arc surface 25 is formed between the guide protrusion friction plane 261 and the circumferential surface of the rotating shaft 2; the articulated seat shaft 31 body is formed with a hinge seat friction plane 361 connected with the articulated seat friction slope 36 at a position relative to the guide protrusion friction plane 261, and an articulated seat shaft connecting arc surface 341 connected with the articulated seat shaft arc surface 34 is formed between the articulated seat friction plane 361 and the circumferential surface of the articulated seat shaft 31. A square hole 22 is opened on the end surface of the rotating shaft 2 away from the shaft core 21, and the square hole 22 is arranged opposite to the door shaft hole 13.

[0023] The middle of the housing 1 is formed with a housing cavity 11 which is open toward one end, and the other end of the housing 1 is provided with a door axis hole 13 which is opposite to the rotating shaft 2, and the door axis hole 13 is connected with the housing cavity 11; the housing 1 is formed with a housing fixing plate 12 which is vertically upward at the end where the door axis hole 13 is provided, and a group of fixing holes 121 are provided on the housing fixing plate 12. A square hole 22 is provided on the end face of the rotating shaft 2 which is away from the shaft core 21, and the square hole 22 is arranged opposite to the door axis hole 13.

[0024] Furthermore, the end of the aforementioned hinge seat 3 away from the rotating shaft 2 is formed with a hinge seat spring connecting column 32, and the end of the aforementioned spring seat 4 is formed with a spring seat connecting column 42, and the two ends of the aforementioned spring 5 are respectively sleeved on the hinge seat spring connecting column 32 and the spring seat connecting column 42. The aforementioned spring seat 4 is provided with a spring seat fixing groove 41 on a side surface away from the spring seat connecting column 42, and a plug plate 43 is arranged in the aforementioned spring seat fixing groove 41; the aforementioned housing 1 is provided with a pair of plug plate holes 14 at the installation position corresponding to the plug plate 43, and the aforementioned plug plate 43 is inserted between the two plug plate holes 14 and is located in the spring seat fixing groove 41, which is used to limit the spring seat 4 from coming off the housing 1.

[0025] See also Figure 3 Combined with Figure 1 , Figure 2 The hinge device is generally used in pairs up and down when in use, and is respectively installed at the door axis position of the refrigerator door 6. Specifically, one end of the housing 1 is buried in the refrigerator door 6, and one end with the housing fixing plate 12 protrudes from the surface of the refrigerator door 6 and is connected and fixed to the refrigerator door 6 by fasteners through the fixing installation hole 121. The refrigerator door axis passes through the door axis hole 13 and is inserted into the square hole 22. When the refrigerator door 6 is opened, the housing 1, the hinge seat 3, the spring seat 4 and the spring 5 are driven to rotate around the shaft core 21. During the rotation, the guide groove 35 is rotated out from the guide protrusion 23, and the friction slope 36 of the hinge seat and the friction slope 26 of the guide protrusion rub against each other. The hinge seat 3 continuously slides along the friction slope 26 of the protrusion to the side away from the rotating shaft 2 and compresses the spring 5 until the friction plane 361 of the hinge seat conflicts with the guide protrusion 23, and the hinge seat 3 can no longer compress the spring 5. When the user does not close the refrigerator door 6, the spring 5 releases its elastic force to push the hinge seat 3 toward the rotating shaft 2. During the movement of the hinge seat 3, the friction slope 36 of the hinge seat rotates along the direction of the guide protrusion friction slope 26, driving the shell 1, the hinge seat 3, the spring seat 4, the spring 5 and the refrigerator door 6 to rotate in the opposite direction around the axis core 21 until the guide groove 35 is re-matched with the guide protrusion 23. At this time, the protrusion friction slope 26 is completely and tightly fitted with the hinge seat friction slope 36, and the guide protrusion friction plane 261 is completely and tightly fitted with the hinge seat friction plane 361, thereby realizing the automatic closing of the refrigerator door 6. In the above-mentioned process of opening and closing the door, when the aforementioned hinge seat friction bevel 36 and the guide protrusion friction bevel 26 are worn, due to the existence of the aforementioned rotating shaft arc surface 25 and the hinge seat shaft arc surface 34, the area of ​​the hinge seat friction bevel 36 and the guide protrusion friction bevel 26 will only become larger and larger, and the positions of the aforementioned rotating shaft arc surface 25 and the hinge seat shaft arc surface 34 will not hinder the local parts of the hinge seat 3 and the rotating shaft 2 respectively, so that the debris in the existing technology will not be generated. This structure not only ensures the reliable automatic closing of the refrigerator door, but also greatly extends the service life.

Claims

1. An automatic return hinge device for a refrigerator door, comprising a housing (1), a rotating shaft (2) arranged in the housing (1) and located at one end of the housing (1), a hinge seat (3) arranged in the housing (1) and cooperating with the rotating shaft (2), a spring seat (4) arranged in the housing (1) and fixed to the other end of the housing (1), and a spring (5) arranged between the hinge seat (3) and the spring seat (4), wherein the rotating shaft (2) is provided with an axis core (21) in the middle part facing the hinge seat (3), the hinge seat (3) is provided with an axis core hole (33) penetrating the length direction of the hinge seat (3) at a position corresponding to the axis core (21), and the axis core (21) is rotatably arranged in the axis core hole (33), characterized in that: The rotating shaft (2) body is semi-enclosed at the connection with the shaft core (21) to form a guide protrusion (23); the hinge seat (3) body is formed with a guide groove (35) which fits with the guide protrusion (23) at the installation position corresponding to the guide protrusion (23); the guide protrusion (23) is formed with a guide protrusion friction slope (26) at a position close to the shaft core hole (33) and facing the guide protrusion (23) on one side of the hinge seat (3); ) is provided at one side of the guide protrusion friction slope (26) and at a position corresponding to the guide protrusion friction slope (26); the guide protrusion friction slope (26) and the articulated seat friction slope (36) are closely attached to each other and slide in cooperation; a rotating shaft arc surface (25) is formed between the guide protrusion friction slope (26) and the circumferential surface of the rotating shaft (2); and an articulated seat shaft arc surface (34) is formed between the articulated seat friction slope (36) and the circumferential surface of the articulated seat shaft (31).

2. The automatic return hinge device for a refrigerator door according to claim 1, characterized in that: A guide protrusion friction plane (261) connected to the guide protrusion friction slope (26) is formed at the connection between the rotating shaft (2) body and the shaft core (21); a rotating shaft connecting arc surface (251) connected to the rotating shaft arc surface (25) is formed between the guide protrusion friction plane (261) and the circumferential surface of the rotating shaft (2); an articulated seat friction plane (361) connected to the articulated seat friction slope (36) is formed on the articulated seat shaft (31) body at a position relative to the guide protrusion friction plane (261); an articulated seat shaft connecting arc surface (341) connected to the articulated seat shaft arc surface (34) is formed between the articulated seat friction plane (361) and the circumferential surface of the articulated seat shaft (31).

3. The automatic return hinge device for a refrigerator door according to claim 1, characterized in that: The shell (1) is provided with a shell cavity (11) in the middle thereof which is open toward one end, and the other end of the shell (1) is provided with a door axis hole (13) which is opposite to the rotating shaft (2), and the door axis hole (13) is communicated with the shell cavity (11); the shell (1) is provided with a shell fixing plate (12) which is vertically upward at one end where the door axis hole (13) is provided, and a group of fixing holes (121) are provided on the shell fixing plate (12).

4. The automatic return hinge device for a refrigerator door according to claim 1, characterized in that: A square hole (22) is provided on the end surface of the rotating shaft (2) away from the shaft core (21), and the square hole (22) is arranged opposite to the door shaft hole (13).

5. The automatic return hinge device for a refrigerator door according to claim 1, characterized in that: An end of the hinge seat (3) away from the rotating shaft (2) is formed with a hinge seat spring connecting column (32), and one end of the spring seat (4) is formed with a spring seat connecting column (42). The two ends of the spring (5) are respectively sleeved on the hinge seat spring connecting column (32) and the spring seat connecting column (42).

6. The automatic return hinge device for a refrigerator door according to claim 5, characterized in that: The spring seat (4) is provided with a spring seat fixing groove (41) on a side surface away from the spring seat connecting column (42), and a plug plate (43) is arranged in the spring seat fixing groove (41); the housing (1) is provided with a pair of plug plate holes (14) at installation positions corresponding to the plug plate (43), and the plug plate (43) is inserted between the two plug plate holes (14) and is located in the spring seat fixing groove (41), so as to prevent the spring seat (4) from coming off the housing (1).

7. The automatic return hinge device for a refrigerator door according to claim 1, characterized in that: The rotating shaft (2) and the hinge seat (3) are made of nylon.

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