Damper and hinge thereof

Abstract

The invention discloses a damper which comprises a cylinder body provided with a guide inclined plane and a piston shaft arranged in a rotating mode. Piston assemblies are arranged at the lower ends of the piston shafts; the piston assembly comprises an upper piston and a lower piston. The lower end of the piston shaft is provided with a linkage shaft matched with the guide inclined face. The upper piston is provided with a first left oil passing hole and a first right oil passing hole in a spaced mode, and the lower piston is provided with a second left oil passing hole and a second right oil passing hole. A movable piston is movably arranged in the second left oil passing hole; a sealing assembly is movably arranged in the first right oil passing hole. According to the damper, the piston assembly can move up and down in the cylinder body by rotating the piston shaft, and the damping effect is achieved; the damping effect on the rotary motion can be directly realized by converting the rotary motion mode and the axial motion mode without additionally installing accessories; the application cost of the damper is reduced, and the production difficulty of products is effectively reduced; meanwhile, the damper is simple in structure and low in production cost.

Description

Technical Field

[0001] This invention relates to the field of damper technology, and more specifically, to a damper and its hinge. Background Technology

[0002] A damper is a device that provides resistance to motion and reduces the energy of motion. Dampers enable products to achieve smooth mechanical movement, improve product quality and lifespan, and are widely used in small flip covers, gift boxes, car window safety handles, floor sockets, hinges, etc. They can effectively reduce the noise generated during product use. When dampers are applied to hinges installed on doors, they can prevent the hinges from being opened violently or closed violently due to the door's own weight. By installing a damper at the rotating connection of the hinge, it can be opened or closed slowly.

[0003] A damper typically consists of a cylinder and a piston shaft with a piston. The piston shaft drives the piston to move up and down within the cylinder, and the damping oil within the cylinder resists the movement of the piston shaft, thus achieving a damping effect. In other words, the damping effect is generated through the axial movement of the piston shaft. However, in practical applications such as the aforementioned door hinges, which involve rotational motion, existing dampers cannot be used directly. It is necessary to use installation accessories to convert the rotational motion of the door hinges to drive the damper's piston shaft to move axially, thereby achieving the damping purpose. This increases the actual application cost of the damper and also increases the manufacturing difficulty of products such as damping hinges. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a damper.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A damper includes a cylinder and a piston shaft rotatably mounted on the cylinder, wherein the inner sidewall of the bottom of the cylinder is provided with an inclined guide surface;

[0007] The lower end of the piston shaft is provided with a piston assembly that divides the cylinder cavity into an upper oil chamber and a lower oil chamber, and the upper end of the piston assembly is fitted with a return spring that drives the piston assembly to move downward.

[0008] The piston assembly includes an upper piston and a lower piston, and the lower end of the piston shaft is provided with a linkage shaft that cooperates with the guide inclined surface;

[0009] The upper piston is provided with a first left oil passage hole and a first right oil passage hole at intervals, and the lower piston is provided with a second left oil passage hole and a second right oil passage hole that are opposite to the first left oil passage hole.

[0010] A movable piston that cooperates with the first left oil passage is movably disposed inside the second left oil passage, and a sealing component for sealing the second right oil passage is movably disposed inside the first right oil passage.

[0011] The piston shaft drives the piston assembly to rotate clockwise. The piston assembly moves downward along the guide slope under the drive of the return spring. The damping oil in the lower oil chamber pushes the moving piston upward from the second left oil passage. The upper end of the moving piston cooperates with the first left oil passage. The damping oil in the lower oil chamber pushes the sealing assembly upward from the second right oil passage and separates it from the second right oil passage.

[0012] The piston shaft drives the piston assembly to rotate counterclockwise. The piston assembly moves upward along the guide slope with the linkage shaft and compresses the return spring. The damping oil in the upper oil chamber pushes the moving piston downward from the first left oil passage hole, and the moving piston separates from the first left oil passage hole.

[0013] The present invention further comprises: the sealing assembly including a sealing steel ball and a compression spring, one end of the compression spring abutting against the bottom wall of the first right oil passage hole, and the other end abutting against the upper end face of the sealing steel ball, thereby driving the lower end face of the sealing steel ball to cooperate with the second right oil passage hole.

[0014] The present invention further comprises: a sealing gasket is provided between the upper piston and the lower piston, and the sealing gasket is provided with a third left oil passage hole and a third right oil passage hole;

[0015] The third left oil passage hole is arranged opposite to the first left oil passage hole and the second left oil passage hole, and the third right oil passage hole is arranged opposite to the first right oil passage hole and the second right oil passage hole;

[0016] The upper end of the movable piston passes through the third left oil passage and engages with the first left oil passage; the outer wall of the movable piston engages with the third left oil passage; and the lower end face of the sealing steel ball engages with the third right oil passage.

[0017] The present invention further provides that the lower end of the movable piston is provided with an annular anti-slip groove that cooperates with the sealing gasket.

[0018] The present invention further provides that: the upper end of the movable piston is provided with a flow-limiting protrusion adapted to the first left oil passage hole.

[0019] The present invention further provides that: the lower end face of the upper piston is provided with an annular oil passage groove, one end of the annular oil passage groove is connected to the first left oil passage hole, and the opening of the other end is connected to the lower oil chamber.

[0020] The present invention further comprises: the lower end of the piston shaft is a flat structure, and both the upper piston and the lower piston are provided with a flat hole in the middle; wherein the upper piston and the lower piston are sequentially sleeved on the lower end of the piston shaft from top to bottom.

[0021] The present invention further comprises: the upper piston and the lower piston are axially movable at the lower end of the piston shaft, so that when the piston shaft drives the upper piston and the lower piston to rotate, the upper piston and the lower piston move up and down relative to the piston shaft;

[0022] Alternatively, the upper and lower pistons can be fixedly mounted at the lower end of the piston shaft, so that when the piston shaft drives the upper and lower pistons to rotate, the piston shaft moves up and down in the cylinder along with the upper and lower pistons.

[0023] The present invention further comprises: a damper of any one of claims 1-8 is installed inside the door leaf bushing; a rotating shaft that cooperates with the piston shaft is provided on the door leaf; and the door leaf drives the piston shaft to rotate through the rotating shaft.

[0024] The present invention further includes: a reset torsion spring is built into the door leaf bushing, one end of the reset torsion spring abuts against the door leaf, and the other end abuts against the door frame leaf.

[0025] The beneficial effects of this invention are as follows: The inner sidewall of the cylinder bottom of the damper is inclined with a guide slope, and a piston assembly is provided at the lower end of the piston shaft, with a return spring sleeved on the upper end of the piston assembly to drive it to move downward; the piston assembly includes an upper piston with a first left oil passage hole and a first right oil passage hole spaced apart, and a lower piston with a second left oil passage hole and a second right oil passage hole; a movable piston for sealing the first left oil passage hole is movably disposed in the second left oil passage hole; and a sealing assembly for sealing the second right oil passage hole is movably disposed in the first right oil passage hole.

[0026] When the piston shaft drives the piston assembly to rotate clockwise, the piston assembly moves downward along the guide slope under the drive of the return spring. The damping oil in the lower oil chamber pushes the moving piston upward from the second left oil passage, and the upper end of the moving piston cooperates with the first left oil passage. The damping oil in the lower oil chamber pushes the sealing assembly upward from the second right oil passage and separates it from the second right oil passage. The damping oil in the lower oil chamber enters the upper oil chamber through the second right oil passage and the first right oil passage. During this process, the damping oil drives the moving piston to always be in contact with the first left oil passage.

[0027] When the piston shaft drives the piston assembly to rotate counterclockwise, the piston assembly moves upward along the guide slope with the linkage shaft and compresses the return spring; the damping oil in the upper oil chamber pushes the moving piston downward through the first left oil passage, and the moving piston separates from the first left oil passage; during this process, the damping oil in the upper oil chamber keeps the sealing component in the first right oil passage in contact with the second right oil passage, and the damping oil in the upper oil chamber enters the lower oil chamber through the first left oil passage and the second left oil passage; the damper can achieve the up and down movement of the piston assembly in the cylinder by rotating the piston shaft, thus achieving the damping effect; no additional accessories are required, and the damping effect of rotational motion can be directly achieved by switching between rotational and axial motion modes; the operating cost of the damper is reduced, and the production difficulty of the product is effectively reduced; at the same time, the damper has a simple structure and low production cost. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of a damper according to the present invention;

[0029] Figure 2 This is an exploded view of a damper according to the present invention;

[0030] Figure 3 This is a schematic diagram of the piston assembly.

[0031] Figure 4 Schematic diagram of the lower piston;

[0032] Figure 5 Schematic diagram of the sealing assembly;

[0033] Figure 6 This is a schematic diagram of the cylinder block structure;

[0034] Figure 7 Piston shaft structure diagram Figure 1 ;

[0035] Figure 8 Piston shaft structure diagram Figure 2 ;

[0036] Figure 9 Cross-sectional view of Example 1;

[0037] Figure 10 Exploded view of the piston assembly in Example 1;

[0038] Figure 11 A schematic diagram of the moving piston in Example 1;

[0039] Figure 12 Cross-sectional view of Example 2;

[0040] Figure 13 Exploded view of the piston assembly in Example 2;

[0041] Figure 14 Example 2: Diagram showing the fit between the piston and the sealing gasket;

[0042] Figure 15 A schematic diagram of the moving piston in Example 2;

[0043] Figure 16 This is a structural diagram of a hinge;

[0044] Figure 17 This is an exploded view of the hinge;

[0045] Explanation of reference numerals in the attached drawings: 1. Cylinder body; 11. Guide slope; 2. Piston shaft; 21. Piston assembly; 211. Upper piston; 2111. First left oil passage hole; 2112. First right oil passage hole; 2113. Sealing assembly; 21131. Sealing steel ball; 21132. Compression spring; 2114. Annular oil passage groove; 212. Lower piston; 2121. Second left oil passage hole; 2122. Second right oil passage hole; 2123. Linkage shaft; 2124. Moving piston; 21241. Flow limiting protrusion; 21242. Annular anti-slip groove; 213. Sealing gasket; 2131. Third left oil passage hole; 2132. Third right oil passage hole; 22. Return spring; 23. Flat structure; 3. Door leaf; 31. Rotating shaft; 32. Return torsion spring; 4. Door frame leaf. Detailed Implementation

[0046] See attached document Figures 1 to 17 The present invention provides a further detailed description of a damper and a hinge.

[0047] Example 1: A damper includes a cylinder body 1 and a piston shaft 2 rotatably mounted on the cylinder body 1, wherein a guide slope 11 is inclinedly provided on the inner side wall of the bottom of the cylinder body 1;

[0048] The lower end of the piston shaft 2 is provided with a piston assembly 21 that divides the cavity of the cylinder 1 into an upper oil chamber and a lower oil chamber, and the upper end of the piston assembly 21 is fitted with a return spring 22 that drives the piston assembly 21 to move downward.

[0049] The piston assembly 21 includes an upper piston 211 and a lower piston 212, and the lower end of the piston shaft 2 is provided with a linkage shaft 2123 that cooperates with the guide inclined surface 11.

[0050] The upper piston 211 is provided with a first left oil passage hole 2111 and a first right oil passage hole 2112 at intervals, and the lower piston 212 is provided with a second left oil passage hole 2121 and a second right oil passage hole 2122 that are opposite to the first left oil passage hole 2111 and opposite to the first right oil passage hole 2112.

[0051] A movable piston 2124 that cooperates with the first left oil passage 2111 is movably disposed in the second left oil passage 2121. A sealing assembly 2113 for sealing the second right oil passage 2122 is movably disposed in the first right oil passage 2112. The sealing assembly 2113 includes a sealing steel ball 21131 and a compression spring 21132. One end of the compression spring 21132 abuts against the bottom wall of the first right oil passage 2112, and the other end abuts against the upper end face of the sealing steel ball 21131, driving the lower end face of the sealing steel ball 21131 to cooperate with the second right oil passage 2122.

[0052] When the piston shaft 2 drives the piston assembly 21 to rotate clockwise, the piston assembly 21 moves downward along the guide slope 11 under the drive of the return spring 22. The damping oil in the lower oil chamber pushes the moving piston 2124 upward from the second left oil passage 2121. The second right oil passage 2122 is connected to the second left oil passage 2121. When the moving piston 2124 moves upward, its upper end engages with the first left oil passage 2111, closing the first left oil passage 2111. The lower end of the moving piston 2124 separates from the second left oil passage 2121, opening the second left oil passage 2121. This allows the damping oil in the lower oil chamber to enter the second right oil passage 2122 from the second left oil passage 2121, pushing the sealing assembly 2113 upward and separating it from the second right oil passage 2122.

[0053] The damping oil in the lower oil chamber enters the upper oil chamber through the second right oil passage 2122 and the first right oil passage 2112. During this process, the damping oil drives the moving piston 2124 to always be in contact with the first left oil passage 2111.

[0054] The lower end face of the upper piston 211 is provided with an annular oil passage groove 2114. One end of the annular oil passage groove 2114 is connected to the first left oil passage hole 2111, and the opening at the other end is connected to the lower oil chamber.

[0055] When the piston shaft 2 drives the piston assembly 21 to rotate counterclockwise, the piston assembly 21 moves upward along the guide slope 11 with the linkage shaft 2123 and compresses the return spring 22; causing the damping oil in the upper oil chamber to push the moving piston 2124 downward from the first left oil passage 2111. The second right oil passage 2122 is connected to the second left oil passage 2121. When the moving piston 2124 moves downward, its upper end separates from the first left oil passage 2111, opening the first left oil passage 2111. The lower end of the moving piston 2124 engages with the second left oil passage 2121, closing the second left oil passage 2121. During this process, the damping oil in the upper oil chamber... The sealing component 2113 in the first right oil passage 2112 is always engaged with the second right oil passage 2122. The damping oil in the upper oil chamber enters the lower oil chamber through the first left oil passage 2111 and the annular oil passage groove 2114, allowing the damping oil in the upper oil chamber to enter the lower oil chamber more smoothly. The damper can realize the up and down movement of the piston assembly 21 in the cylinder 1 by rotating the piston shaft 2, thereby achieving the damping effect. No additional accessories are required. The damping effect of the rotational motion can be directly achieved by switching between the rotational motion mode and the axial motion mode. This reduces the operating cost of the damper and effectively reduces the production difficulty of the product. At the same time, the damper has a simple structure and low production cost.

[0056] A sealing gasket 213 is provided between the upper piston 211 and the lower piston 212. The sealing gasket 213 has a third left oil passage hole 2131 and a third right oil passage hole 2132. The third left oil passage hole 2131 is opposite to the first left oil passage hole 2111 and the second left oil passage hole 2121, and the third right oil passage hole 2132 is opposite to the first right oil passage hole 2112 and the second right oil passage hole 2122. The lower end of the movable piston 2124 has an annular anti-slip groove 21242 that mates with the sealing gasket 213. The upper end of the movable piston 2124 passes through the third left oil passage hole 2131 and mates with the first left oil passage hole 2111. The outer wall of the movable piston 2124 mates with the third left oil passage hole 2131, and the lower end face of the sealing steel ball 21131 mates with the third right oil passage hole 2132. When the upper end of the moving piston 2124 engages with the first left oil passage 2111, the inner wall of the third left oil passage 2131 of the sealing gasket 213 is embedded in the annular anti-slip groove 21242, increasing the engagement force between the moving piston 2124 and the sealing gasket 213. Only when the damping oil pressure in the upper oil chamber is sufficient to overcome the engagement force between the moving piston 2124 and the sealing gasket 213 can the moving piston 2124 be pushed downward to open the first left oil passage 2111. That is, when the pressure of the damping oil in the upper oil chamber is large enough, the damper is in a stopped state. When a sufficiently large external force rotates the piston shaft 2, driving the piston assembly 21 to move upward, continuously compressing the damping oil in the upper oil chamber, and making the pressure in the upper oil chamber sufficient to push the moving piston 2124 downward, the first left oil passage 2111 is opened, so that the damper plays a stopping role.

[0057] The upper end of the movable piston 2124 is provided with a flow-limiting protrusion 21241 adapted to the first left oil passage 2111. The flow-limiting protrusion 21241 is inserted upward into the first left oil passage 2111 and plays a flow-limiting role in the first left oil passage 2111. That is, in the first period of the movable piston 2124 moving downward, the flow-limiting protrusion 21241 is always placed in the first left oil passage 2111 and plays a flow-limiting role in the damping oil flowing through the first left oil passage 2111. When the movable piston 2124 continues to move downward, the flow-limiting protrusion 21241 separates from the first left oil passage 2111, so that the first left oil passage 2111 is fully opened; thereby reducing the rotational speed of the piston shaft 2 and slowing down the upward movement speed of the piston assembly 21.

[0058] The lower end of the piston shaft 2 is a flat structure 23, and the upper piston 211 and the lower piston 212 are both provided with flat holes in the middle; the upper piston 211 and the lower piston 212 are sequentially sleeved on the lower end of the piston shaft 2 from top to bottom.

[0059] The upper piston 211 and lower piston 212 are axially movable and disposed at the lower end of the piston shaft 2, so that when the piston shaft 2 drives the upper piston 211 and piston to rotate, the upper piston 211 and lower piston 212 move up and down relative to the piston shaft 2; this structure is applied to piston shaft 2 only rotating relative to cylinder 1, without extending or retracting relative to cylinder 1.

[0060] Alternatively, the upper piston 211 and the lower piston 212 are fixedly installed at the lower end of the piston shaft 2, so that when the piston shaft 2 drives the upper piston 211 and the lower piston 212 to rotate, the piston shaft 2 moves up and down with the upper piston 211 and the lower piston 212 in the cylinder body 1; this structure is applied to the piston shaft 2, which rotates relative to the cylinder body 1 and also extends and retracts relative to the cylinder body 1.

[0061] Example 2: A damper includes a cylinder 1 and a piston shaft 2 rotatably mounted on the cylinder 1, wherein the inner sidewall of the bottom of the cylinder 1 is provided with an inclined guide surface 11;

[0062] The lower end of the piston shaft 2 is provided with a piston assembly 21 that divides the cavity of the cylinder 1 into an upper oil chamber and a lower oil chamber, and the upper end of the piston assembly 21 is fitted with a return spring 22 that drives the piston assembly 21 to move downward.

[0063] The piston assembly 21 includes an upper piston 211 and a lower piston 212, and the lower end of the piston shaft 2 is provided with a linkage shaft 2123 that cooperates with the guide inclined surface 11.

[0064] The upper piston 211 is provided with a first left oil passage hole 2111 and a first right oil passage hole 2112 at intervals, and the lower piston 212 is provided with a second left oil passage hole 2121 and a second right oil passage hole 2122 that are opposite to the first left oil passage hole 2111 and opposite to the first right oil passage hole 2112.

[0065] A movable piston 2124 that cooperates with the first left oil passage 2111 is movably disposed in the second left oil passage 2121. A sealing assembly 2113 for sealing the second right oil passage 2122 is movably disposed in the first right oil passage 2112. The sealing assembly 2113 includes a sealing steel ball 21131 and a compression spring 21132. One end of the compression spring 21132 abuts against the bottom wall of the first right oil passage 2112, and the other end abuts against the upper end face of the sealing steel ball 21131, driving the lower end face of the sealing steel ball 21131 to cooperate with the second right oil passage 2122.

[0066] When the piston shaft 2 drives the piston assembly 21 to rotate clockwise, the piston assembly 21 moves downward along the guide slope 11 under the drive of the return spring 22. The damping oil in the lower oil chamber pushes the moving piston 2124 upward from the second left oil passage 2121. The second right oil passage 2122 is connected to the second left oil passage 2121. When the moving piston 2124 moves upward, its upper end cooperates with the first left oil passage 2111, closing the first left oil passage 2111. The lower end of 124 is separated from the second left oil passage 2121. The second left oil passage 2121 is opened, so that the damping oil in the lower oil chamber enters the second right oil passage 2122 from the second left oil passage 2121 and pushes the sealing assembly 2113 upward to move upward and separate from the second right oil passage 2122. The damping oil in the lower oil chamber enters the upper oil chamber through the second right oil passage 2122 and the first right oil passage 2112. During this process, the damping oil drives the moving piston 2124 to always be with the first left oil passage 2111.

[0067] The lower end face of the upper piston 211 is provided with an annular oil passage groove 2114. One end of the annular oil passage groove 2114 is connected to the first left oil passage hole 2111, and the opening at the other end is connected to the lower oil chamber.

[0068] When the piston shaft 2 drives the piston assembly 21 to rotate counterclockwise, the piston assembly 21 moves upward along the guide slope 11 with the linkage shaft 2123 and compresses the return spring 22; causing the damping oil in the upper oil chamber to push the moving piston 2124 downward from the first left oil passage 2111. The second right oil passage 2122 is connected to the second left oil passage 2121. When the moving piston 2124 moves downward, its upper end separates from the first left oil passage 2111, opening... The lower end of the moving piston 2124 engages with the second left oil passage 2121 through the first left oil passage 2111, closing the second left oil passage 2121. During this process, the damping oil in the upper oil chamber ensures that the sealing assembly 2113 in the first right oil passage 2112 always engages with the second right oil passage 2122. The damping oil in the upper oil chamber enters the lower oil chamber through the first left oil passage 2111 and the annular oil passage groove 2114, allowing the damping oil in the upper oil chamber to enter the lower oil chamber more smoothly.

[0069] This damper allows the piston assembly 21 to move up and down within the cylinder 1 by rotating the piston shaft 2, thus achieving a damping effect. No additional accessories are required; simply switching between rotational and axial motion modes directly generates damping for rotational motion. This reduces the operating cost of the damper and effectively lowers the production difficulty of the product. At the same time, the damper has a simple structure and low production cost.

[0070] The upper end of the movable piston 2124 is provided with a flow-limiting protrusion 21241 adapted to the first left oil passage 2111. The flow-limiting protrusion 21241 is inserted upward into the first left oil passage 2111, which restricts the flow of the first left oil passage 2111. That is, during the initial period of downward movement of the movable piston 2124, the flow-limiting protrusion 21241 is always placed inside the first left oil passage 2111, and the damping oil in the upper oil chamber can only flow into the lower oil chamber through the gap between the first left oil passage 2111 and the flow-limiting protrusion 21241. It restricts the flow of damping oil flowing through the first left oil passage 2111. When the movable piston 2124 continues to move downward, the flow-limiting protrusion 21241 separates from the first left oil passage 2111, so that the first left oil passage 2111 is fully opened. This reduces the rotational speed of the piston shaft 2 and slows down the upward movement of the piston assembly 21.

[0071] The lower end of the piston shaft 2 is a flat structure 23, and the upper piston 211 and the lower piston 212 are both provided with flat holes in the middle; the upper piston 211 and the lower piston 212 are sequentially sleeved on the lower end of the piston shaft 2 from top to bottom.

[0072] The upper piston 211 and lower piston 212 are axially movable and disposed at the lower end of the piston shaft 2, so that when the piston shaft 2 drives the upper piston 211 and piston to rotate, the upper piston 211 and lower piston 212 move up and down relative to the piston shaft 2; this structure is applied to piston shaft 2 only rotating relative to cylinder 1, without extending or retracting relative to cylinder 1.

[0073] Alternatively, the upper piston 211 and the lower piston 212 are fixedly installed at the lower end of the piston shaft 2, so that when the piston shaft 2 drives the upper piston 211 and the lower piston 212 to rotate, the piston shaft 2 moves up and down with the upper piston 211 and the lower piston 212 in the cylinder body 1; this structure is applied to the piston shaft 2, which rotates relative to the cylinder body 1 and also extends and retracts relative to the cylinder body 1.

[0074] Example 3: A hinge including a door leaf 3 and a door frame 4. A damper of any type from Example 1 is installed inside the bushing of the door leaf 3. A rotating shaft 31, cooperating with a piston shaft 2, is provided on the door leaf 3. The door leaf 3 drives the piston shaft 2 to rotate via the rotating shaft 31. A return torsion spring 32 is built into the bushing of the door leaf 3. One end of the return torsion spring 32 abuts against the door leaf 3, and the other end abuts against the door frame 4. When the door leaf is opened, the door leaf 3 compresses the return torsion spring 32. After the door leaf is released, the return torsion spring 32 drives the door leaf 3 to rotate in the opposite direction, closing the door leaf. When the door leaf is opened, the piston assembly 21 inside the damper moves downward under the drive of the piston shaft 2 and the return spring 22. The damping oil in the lower oil chamber of the cylinder 1 pushes the sealing steel ball 21131 upward through the second right oil passage 2122 and enters the upper oil chamber through the first right oil passage 2112. When the door leaf is released, the door leaf... The damper is in a stopped state under its action. Only when pulled by an external force will the moving piston 2124 inside the damper separate from the first left oil passage 2111. The door leaf closes automatically under the drive of the return torsion spring 32. Initially, due to the large cooperation force between the moving piston 2124 and the sealing gasket 213, the piston assembly 21 stays in the corresponding position for a short time, preventing the door leaf 3 from closing directly, thus pausing the door. When an external force is applied, the piston assembly 21 moves upward, compressing the damping oil in the upper oil chamber and increasing the pressure in the upper oil chamber. When the pressure generated by the damping oil in the upper oil chamber is sufficient to overcome the cooperation force between the moving piston 2124 and the sealing gasket 213, the moving piston 2124 moves downward slowly, causing the damping oil in the upper oil chamber to flow downward and push the moving piston 2124 to completely separate from the first left oil passage 2111, thus pushing the door leaf to close. This serves to stop the door leaf in a certain position.

[0075] Example 4: A hinge including a door leaf 3 and a door frame 4. A damper of any type from Example 2 is installed inside the bushing of the door leaf 3. A rotating shaft 31, cooperating with a piston shaft 2, is provided on the door leaf 3. The door leaf 3 drives the piston shaft 2 to rotate via the rotating shaft 31. A return torsion spring 32 is built into the bushing of the door leaf 3. One end of the return torsion spring 32 abuts against the door leaf 3, and the other end abuts against the door frame 4. When the door leaf is opened, the door leaf 3 compresses the return torsion spring 32. After the door leaf is released, the return torsion spring 32 drives the door leaf 3 to rotate in the opposite direction, closing the door leaf. When the door leaf is opened, the piston assembly 21 inside the damper... Driven by the return spring 22, the piston shaft 2 moves downward. The damping oil in the lower oil chamber of the cylinder 1 pushes the sealing steel ball 21131 upward through the second right oil passage 2122 and enters the upper oil chamber through the first right oil passage 2112. When the door is released, the door closes under the action of the return torsion spring, which drives the moving piston 2124 in the damper to move downward. During this process, the flow-limiting protrusion 21241 of the moving piston 2124 moves downward. Before the flow-limiting protrusion 21241 leaves the first left oil passage 2111, it can control the flow rate of the damping oil in the first left oil passage 2111. That is, the damper has a large damping effect during this process, which slows down the closing of the door.

[0076] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A damper, characterized in that: It includes a cylinder body and a piston shaft rotatably mounted on the cylinder body, wherein the inner sidewall of the bottom of the cylinder body is inclined with a guide slope. The lower end of the piston shaft is provided with a piston assembly that divides the cylinder cavity into an upper oil chamber and a lower oil chamber, and the upper end of the piston assembly is fitted with a return spring that drives the piston assembly to move downward. The piston assembly includes an upper piston and a lower piston, and the lower end of the piston shaft is provided with a linkage shaft that cooperates with the guide inclined surface; The upper piston is provided with a first left oil passage hole and a first right oil passage hole at intervals, and the lower piston is provided with a second left oil passage hole and a second right oil passage hole that are opposite to the first left oil passage hole. A movable piston that cooperates with the first left oil passage is movably disposed inside the second left oil passage, and a sealing component for sealing the second right oil passage is movably disposed inside the first right oil passage. The piston shaft drives the piston assembly to rotate clockwise. The piston assembly moves downward along the guide slope under the drive of the return spring. The damping oil in the lower oil chamber pushes the moving piston upward from the second left oil passage. The upper end of the moving piston cooperates with the first left oil passage. The damping oil in the lower oil chamber pushes the sealing assembly upward from the second right oil passage and separates it from the second right oil passage. The piston shaft drives the piston assembly to rotate counterclockwise. The piston assembly moves upward along the guide slope with the linkage shaft and compresses the return spring. The damping oil in the upper oil chamber pushes the moving piston downward from the first left oil passage hole, and the moving piston separates from the first left oil passage hole.

2. A damper according to claim 1, characterized in that: The sealing assembly includes a sealing steel ball and a compression spring. One end of the compression spring abuts against the bottom wall of the first right oil passage hole, and the other end abuts against the upper end face of the sealing steel ball, driving the lower end face of the sealing steel ball to cooperate with the second right oil passage hole.

3. A damper according to claim 2, characterized in that: A sealing gasket is provided between the upper piston and the lower piston, and the sealing gasket is provided with a third left oil passage hole and a third right oil passage hole; The third left oil passage hole is arranged opposite to the first left oil passage hole and the second left oil passage hole, and the third right oil passage hole is arranged opposite to the first right oil passage hole and the second right oil passage hole; The upper end of the movable piston passes through the third left oil passage and engages with the first left oil passage; the outer wall of the movable piston engages with the third left oil passage; and the lower end face of the sealing steel ball engages with the third right oil passage.

4. A damper according to claim 3, characterized in that: The lower end of the movable piston is provided with an annular anti-slip groove that mates with the sealing gasket.

5. A damper according to claim 3, characterized in that: The upper end of the movable piston is provided with a flow-limiting protrusion that is adapted to the first left oil passage.

6. A damper according to claim 1, 2, 3, 4, or 5, characterized in that: The lower end face of the upper piston is provided with an annular oil passage groove. One end of the annular oil passage groove is connected to the first left oil passage hole, and the opening at the other end is connected to the lower oil chamber.

7. A damper according to claim 1, 2, 3, 4, or 5, characterized in that: The lower end of the piston shaft has a flat structure, and both the upper and lower pistons have a flat hole in the middle; the upper and lower pistons are sequentially fitted onto the lower end of the piston shaft from top to bottom.

8. A damper according to claim 7, characterized in that: The upper piston and lower piston are axially movable at the lower end of the piston shaft, so that when the piston shaft drives the upper piston and piston to rotate, the upper piston and lower piston move up and down relative to the piston shaft. Alternatively, the upper and lower pistons can be fixedly mounted at the lower end of the piston shaft, so that when the piston shaft drives the upper and lower pistons to rotate, the piston shaft moves up and down in the cylinder along with the upper and lower pistons.

9. A hinge comprising a door leaf hinge and a door frame hinge; characterized in that: The damper of any one of claims 1-8 is installed inside the door leaf bushing, and a rotating shaft that cooperates with the piston shaft is provided on the door leaf, and the door leaf drives the piston shaft to rotate through the rotating shaft.

10. A hinge according to claim 9, characterized in that: The door leaf bushing has a built-in return torsion spring, one end of which abuts against the door leaf and the other end against the door frame leaf.

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