A rotary damper

Abstract

The present invention relates to a rotary damper, comprising a housing and a rotor. A plurality of liquid reflux grooves are provided between the housing and the rotor, and a gap L is provided between the housing and the rotor to connect the liquid reflux grooves. The rotor and the housing form a sealed space through a sealing structure. The sealed space contains damping liquid. The rotor or the housing of the damper rotates in a fixed direction. Under the action of mechanical extrusion, the damping liquid flows in one direction of the liquid reflux groove through the gap L. When the damping liquid reaches the reflux groove position during the flow process, part of the liquid flows in the opposite direction to form a reflux, and at the same time forms a reaction force on the forward-flowing liquid, slowing down the flow speed of the forward-flowing damping liquid, thereby generating resistance to block the rotation of the rotor or the housing, thereby achieving the damping and buffering effect of the rotary damper. The size, shape, and number of the liquid reflux grooves determine the magnitude of the damping force of the rotary damper. This structure is simple to manufacture, low in cost, and stable in effect, and solves the defects of the existing damper, such as high manufacturing precision requirements, high cost, and unstable effect.

Description

Technical Field

[0001] The present invention relates to the technical field of buffer damping, and in particular to a rotation damper. The rotation damper is specifically applied to a furniture hinge. Background Art

[0002] Existing rotary cylinders, or rotary dampers, consist of a housing and a rotor. The rotor's outer surface is generally cylindrical, creating a gap between the rotor and the housing for the flow of damping fluid. As the rotor rotates, the damping fluid flows in this gap, coming into contact with the rotor's outer surface and creating a damping force that impedes the rotor's motion, achieving a buffering and damping effect. The damping force of this rotary damper is not adjustable, as this requires further improvement. Summary of the Invention

[0003] The purpose of the present invention is to provide a rotary damper, in which the rotor or shell of the damper rotates in a fixed direction. Under the action of mechanical extrusion, the damping fluid in the sealed space flows in one direction of the liquid reflux groove through the gap L between the shell and the rotor. During the flow of the damping fluid, when it reaches the position of the liquid reflux groove, part of the liquid flows in the opposite direction to form a reflux, and at the same time forms a reaction force on the damping fluid flowing in the forward direction, slowing down the flow speed of the damping fluid flowing in the forward direction, that is, the damping effect. The size, shape, and number of the liquid reflux grooves determine the size of the damping force of the rotary damper, thereby solving the problem that the damping force of the existing rotary damper cannot be adjusted.

[0004] A rotary damper designed for this purpose includes a shell and a rotor rotating in the shell. A plurality of liquid reflux grooves spaced apart from each other are provided at the rotating fitting between the shell and the rotor, and a gap L connecting the liquid reflux grooves is provided between the shell and the rotor. A fixed sealed space is formed between the rotor and the shell by a sealing structure, and damping liquid is provided in the sealed space. The rotor or shell of the damper rotates in a fixed direction. Under the action of mechanical extrusion, the damping liquid in the sealed space flows in one direction of the liquid reflux groove through the gap L between the shell and the rotor. During the flow of the damping liquid, when it reaches the position of the liquid reflux groove, part of the damping liquid flows in the opposite direction to form a reflux, and at the same time forms a reaction force on the damping liquid flowing in the forward direction, slowing down the flow speed of the damping liquid flowing in the forward direction, so as to generate resistance to block the rotation of the rotor or the shell, thereby achieving the damping and buffering effect of the rotary damper.

[0005] The capacity or cross-sectional area of each liquid reflux groove is different, so that the time for the damping liquid to reversely flow in each liquid reflux groove is different. Then, by changing the shape of each liquid reflux groove, the damping force of the rotary damper can be adjusted, thereby solving the problem that the damping force of the existing rotary damper cannot be adjusted.

[0006] The housing is provided with a first curved wall and a plurality of slots spaced apart from each other. The rotor is provided with a plurality of protruding teeth spaced apart from each other corresponding to the first curved wall. The rotor is provided with a second curved wall corresponding to each slot. A plurality of independently spaced liquid reflux grooves are formed between the first curved wall and the plurality of protruding teeth, and / or a plurality of independently spaced liquid reflux grooves are formed between the plurality of slots and the second curved wall. The independently spaced liquid reflux grooves ensure that the damping fluid in each reflux groove circulates independently of each other, and the small area of some liquid reflux grooves shortens the reverse flow time of some liquid.

[0007] The plurality of convex teeth on the rotor include a first convex tooth and a second convex tooth arranged end to end. A first liquid reflux groove is formed between one end of the first curved wall and one end of the first convex tooth, and a second liquid reflux groove is formed between the other end of the first curved wall and the second convex tooth. By adjusting the position of the rotor in the housing so that the first convex tooth and the second convex tooth are respectively close to or away from the end of the first curved wall, the liquid storage capacity of the first liquid reflux groove and the second liquid reflux groove can be adjusted, thereby adjusting the length of the circulating flow distance of the damping liquid, and / or adjusting the time for the damping liquid to form a reverse flow in the first liquid reflux groove and the second liquid reflux groove.

[0008] During the installation process, the rotor or the housing may be rotated to change the shape of the first liquid reflux groove or the second liquid reflux groove.

[0009] By changing the shape and / or number of several slots on the housing and / or changing the shape and / or number of several convex teeth on the rotor, the shape and / or number of several liquid reflux grooves can be changed, thereby adjusting the damping force of the rotary damper, thereby solving the problem that the damping force of the existing rotary damper cannot be adjusted.

[0010] A positioning column extending upward is provided on the inner bottom wall of the shell, and a positioning cavity is provided on the rotor corresponding to the positioning column. The positioning column in the shell is relatively inserted into the positioning cavity of the rotor. When the rotor rotates under the action of external force, the positioning column is relatively limited and rotated in the positioning cavity, so that the rotor is positioned and rotated in the shell.

[0011] The positioning column of the housing is provided with a first step portion, and the positioning cavity of the rotor is provided with a second step portion corresponding to the first step portion. The rotor is positioned up and down in the housing through the first step portion and the second step portion.

[0012] A first sealing groove for assembling a first sealing ring is formed between the first step portion and the second step portion. Side walls of the first step portion and the second step portion respectively form sealing contact with the first sealing ring to prevent the damping fluid from leaking therefrom.

[0013] The head of the rotor is provided with a second sealing groove for assembling a second sealing ring. When the rotor is inserted into the housing, the head of the rotor seals the opening of the housing cavity, and the second sealing ring forms a sealing contact with the inner wall of the housing to prevent the damping fluid from leaking there.

[0014] The rotor comprises a head and a rotor rod, and the head and the rotor rod are formed into an integral rotor by injection molding.

[0015] The present invention has the following beneficial effects:

[0016] A plurality of liquid reflux grooves spaced apart from each other are provided at the rotating fitting between the outer shell and the rotor, and a gap L connecting the liquid reflux grooves is provided between the outer shell and the rotor; the rotor or outer shell of the damper rotates in a fixed direction, and under the action of mechanical extrusion, the damping liquid in the sealed space flows in one direction of the liquid reflux groove through the gap L between the outer shell and the rotor. During the flow of the damping liquid, when it reaches the position of the liquid reflux groove, part of the liquid flows in the opposite direction to form a reflux, and at the same time forms a reaction force on the damping liquid flowing in the forward direction, slowing down the flow speed of the damping liquid flowing in the forward direction, that is, the damping effect. The size, shape, and number of the liquid reflux grooves determine the magnitude of the damping force of the rotary damper, thereby solving the problem that the damping force of the existing rotary damper cannot be adjusted.

[0017] The structure of the present invention is simple to manufacture, low in cost and stable in effect, and solves the defects of the existing damper such as high manufacturing precision requirement, high cost and unstable effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the cross-sectional structure of the liquid reflux groove between the housing and the rotor according to one embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram of the cross-sectional structure of the outer shell of an embodiment of the present invention.

[0020] Figure 3 This is a schematic diagram of a partial cross-sectional structure of a rotor according to an embodiment of the present invention.

[0021] Figure 4 This is a schematic diagram of the cross-sectional structure of another liquid reflux groove between the housing and the rotor of the present invention.

[0022] Figure 5 This is a schematic diagram of the exploded structure of the housing and rotor assembly according to one embodiment of the present invention.

[0023] Figure 6 This is a schematic diagram of the three-dimensional cross-sectional structure of the housing and rotor assembly according to one embodiment of the present invention.

[0024] Figure 7 Schematic diagram of the flow structure of the damping fluid according to an embodiment of the present invention. DETAILED DESCRIPTION

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0026] See also Figures 1-6 A rotary damper comprises a shell 1 and a rotor 2 rotating in the shell 1. A plurality of liquid reflux grooves 3 arranged at intervals from each other are provided at the rotating fitting between the shell 1 and the rotor 2, and a gap L connecting the liquid reflux groove 3 is provided between the shell 1 and the rotor 2; a fixed sealed space is formed between the rotor 2 and the shell 1 by a sealing structure, and a damping fluid is provided in the sealed space. The rotor 2 or the shell 1 of the damper rotates in a fixed direction. Under the action of mechanical extrusion, the damping fluid in the sealed space flows in one direction of the liquid reflux groove 3 through the gap L between the shell and the rotor. During the flow of the damping fluid, when it reaches the position of the liquid reflux groove 3, part of the damping fluid flows in the opposite direction to form a reflux, and at the same time forms a reaction force on the damping fluid flowing in the forward direction, slowing down the flow speed of the damping fluid flowing in the forward direction, so as to generate resistance to block the rotation of the rotor 2 or the shell 1, thereby realizing the damping and buffering effect of the rotary damper.

[0027] The capacity or cross-sectional area of each liquid reflux groove 3 is different, so that the time for the damping liquid to reversely flow in each liquid reflux groove 3 is different, and the damping force of the rotary damper can be adjusted by changing the shape of each liquid reflux groove 3.

[0028] A first curved wall 4 and a plurality of slots 5 spaced apart from each other are provided in the housing 1. A plurality of convex teeth 6 spaced apart from each other are provided on the rotor 2 corresponding to the first curved wall 4. A second curved wall 7 is provided on the rotor 2 corresponding to each slot 5. A plurality of independently spaced liquid reflux grooves 3 are formed between the first curved wall 4 and the plurality of convex teeth 6, and / or a plurality of independently spaced liquid reflux grooves 3 are formed between the plurality of slots 5 and the second curved wall 7.

[0029] The several protruding teeth 6 on the rotor 2 include a first protruding tooth 8 and a second protruding tooth 9 arranged end to end. A first liquid reflux groove 10 is formed between one end of the first curved wall 4 and one end of the first protruding tooth 8, and a second liquid reflux groove 11 is formed between the other end of the first curved wall 4 and the second protruding tooth 9. By adjusting the position of the rotor 2 in the housing 1 so that the first protruding tooth 8 and the second protruding tooth 9 are respectively close to or away from the end of the first curved wall 4, the liquid storage capacity of the first liquid reflux groove 10 and the second liquid reflux groove 11 can be adjusted, thereby adjusting the length of the circulating flow distance of the damping fluid, and / or adjusting the time for the damping fluid to form a reverse flow in the first liquid reflux groove 10 and the second liquid reflux groove 11.

[0030] In this embodiment, for example, when the rotor 2 rotates, the first protruding teeth 8 drive the damping fluid to flow toward one end of the first liquid reflux groove 10. When the damping fluid reaches one end of the first liquid reflux groove 10, one end of the first liquid reflux groove 10 blocks the damping fluid from continuing to flow, and the damping fluid can only flow in the reverse direction, that is, the damping fluid circulates in the first liquid reflux groove 10. The reflux of the damping fluid simultaneously forces the rotation of the rotor 2 to generate resistance, that is, the damping effect.

[0031] By changing the shape and / or number of the plurality of slots 5 on the housing 1 and / or the shape and / or number of the plurality of protruding teeth 6 on the rotor 2, the shape and / or number of the plurality of liquid reflux grooves 3 can be changed, thereby adjusting the damping force of the rotary damper.

[0032] A positioning post 12 extending upward is provided on the inner bottom wall of the housing 1, and a positioning cavity 13 is provided on the rotor 2 corresponding to the positioning post 12. The positioning post 12 in the housing 1 is relatively inserted into the positioning cavity 13 of the rotor 2. When the rotor 2 rotates under the action of external force, the positioning post 12 is relatively limited and rotated in the positioning cavity 13, so that the rotor 2 is positioned and rotated in the housing 1.

[0033] The positioning column 12 of the housing 1 is provided with a first step 14 , and the positioning cavity 13 of the rotor 2 is provided with a second step 15 corresponding to the first step 14 . The rotor 2 is positioned vertically in the housing 1 by the first step 14 and the second step 15 .

[0034] A first sealing groove for assembling the first sealing ring 16 is formed between the first step portion 14 and the second step portion 15 , and the side walls of the first step portion 14 and the second step portion 15 are in sealing contact with the first sealing ring 16 respectively.

[0035] The head of the rotor 2 is provided with a second sealing groove for assembling the second sealing ring 17 . The rotor 2 is inserted into the housing 1 , and the head of the rotor 2 seals the opening of the inner cavity of the housing 1 , and the second sealing ring 17 forms a sealing contact with the inner wall of the housing 1 .

[0036] In addition, a positioning step fitting portion is provided between the head of the rotor 2 and the inner cavity of the shell 1, and a positioning step fitting portion may also be provided between the bottom of the piston rod of the rotor 2 and the bottom wall of the inner cavity of the shell 1, so that the rotor 2 is positioned in the inner cavity of the shell 1.

[0037] The rotor 2 includes a head and a rotor rod, and the head and the rotor rod are provided as an integral rotor 2 by injection molding.

[0038] See also Figure 7The damping fluid circulates in the gap L between the housing 1 and the rotor 2. When the damping fluid flows to the liquid reflux groove 3, part of the damping fluid flows in a different direction (diverges), so that the damping fluid generates forward flow and reverse flow between the housing 1 and the rotor 2. The reverse flow of the damping fluid blocks the forward flow of the damping fluid and slows down the flow speed of the forward flow of the damping fluid, thereby generating resistance to block the rotation of the rotor 2 or the housing 1, thereby achieving the damping and buffering effect of the rotary damper.

[0039] The above is a preferred embodiment of the present invention, which illustrates and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A rotary damper comprising a housing (1) and a rotor (2) rotating within the housing (1), characterized in that: A plurality of liquid reflux grooves (3) spaced apart from each other are provided at the rotational engagement portion between the housing (1) and the rotor (2), and a gap L communicating with the liquid reflux grooves (3) is provided between the housing (1) and the rotor (2); a fixed sealed space is formed between the rotor (2) and the housing (1) by a sealing structure, and damping liquid is provided in the sealed space. The rotor (2) or the housing (1) of the damper rotates in a fixed direction. Under the action of mechanical extrusion, the damping liquid in the sealed space flows in one direction of the liquid reflux groove (3) through the gap L between the housing and the rotor. During the flow of the damping liquid, when it reaches the position of the liquid reflux groove (3), part of the damping liquid flows in the reverse direction to form a reflux, and at the same time forms a reaction force on the damping liquid flowing in the forward direction, slowing down the flow speed of the damping liquid flowing in the forward direction, thereby generating resistance to block the rotation of the rotor (2) or the housing (1), thereby achieving a damping and buffering effect of the rotary damper; A first arcuate wall (4) and a plurality of slots (5) spaced apart from each other are provided in the housing (1); a plurality of convex teeth (6) spaced apart from each other are provided on the rotor (2) corresponding to the first arcuate wall (4); a second arcuate wall (7) is provided on the rotor (2) corresponding to each slot (5); a plurality of independently spaced liquid reflux grooves (3) are formed between the first arcuate wall (4) and the plurality of convex teeth (6); and / or a plurality of independently spaced liquid reflux grooves (3) are formed between the plurality of slots (5) and the second arcuate wall (7); The plurality of protruding teeth (6) on the rotor (2) include a first protruding tooth (8) and a second protruding tooth (9) arranged end to end. A first liquid reflux groove (10) is formed between one end of the first arc-shaped wall (4) and one end of the first protruding tooth (8), and a second liquid reflux groove (11) is formed between the other end of the first arc-shaped wall (4) and the second protruding tooth (9). By adjusting the position of the rotor (2) in the housing (1), the first protruding tooth (8) and the second protruding tooth (9) are respectively moved closer to or farther away from the end of the first arc-shaped wall (4), so as to adjust the liquid storage capacity of the first liquid reflux groove (10) and the second liquid reflux groove (11), thereby adjusting the length of the circulating flow path of the damping liquid and / or adjusting the time for the damping liquid to form a reverse flow in the first liquid reflux groove (10) and the second liquid reflux groove (11).

2. The rotary damper according to claim 1, characterized in that: The capacity or cross-sectional area of each liquid reflux groove (3) is different, so that the time for the damping liquid to reversely flow in each liquid reflux groove (3) is different, and the damping force of the rotary damper is adjusted by changing the shape of each liquid reflux groove (3).

3. The rotary damper according to claim 1, characterized in that: By changing the shape and / or number of a plurality of slots (5) on the housing (1), and / or changing the shape and / or number of a plurality of protruding teeth (6) on the rotor (2), the shape and / or number of a plurality of liquid reflux grooves (3) are changed, thereby adjusting the damping force of the rotary damper.

4. The rotary damper according to claim 1, characterized in that: A positioning column (12) extending upward is provided on the inner bottom wall of the housing (1), and a positioning cavity (13) is provided in the rotor (2) corresponding to the positioning column (12). The positioning column (12) in the housing (1) is relatively inserted into the positioning cavity (13) of the rotor (2). When the rotor (2) rotates under the action of an external force, the positioning column (12) is relatively limited and rotated in the positioning cavity (13), so that the rotor (2) is positioned and rotated in the housing (1).

5. The rotary damper according to claim 4, characterized in that: A first step portion (14) is provided on the positioning column (12) of the housing (1), and a second step portion (15) is provided in the positioning cavity (13) of the rotor (2) corresponding to the first step portion (14). The rotor (2) is positioned vertically in the housing (1) via the first step portion (14) and the second step portion (15).

6. The rotary damper according to claim 5, characterized in that: A first sealing groove for assembling a first sealing ring (16) is formed between the first step portion (14) and the second step portion (15), and the side walls of the first step portion (14) and the second step portion (15) respectively form sealing contact with the first sealing ring (16).

7. The rotary damper according to claim 1, characterized in that: The head of the rotor (2) is provided with a second sealing groove for assembling a second sealing ring (17). The rotor (2) is inserted into the housing (1). The head of the rotor (2) seals the opening of the inner cavity of the housing (1), and the second sealing ring (17) forms a sealing contact with the inner wall of the housing (1).

8. The rotary damper according to claim 7, characterized in that: The rotor (2) comprises a head and a rotor rod, and the head and the rotor rod are provided as an integral rotor (2) by injection molding.

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