Two-stage slow closing damper
By designing a two-stage slow-closing damper, the damping effect of the piston shaft's rapid retraction and slow closing is utilized to solve the impact force problem when the self-returning sliding door closes, thereby improving the lifespan of the sliding door and the shopping experience.
Patent Information
- Application Number
- CN202520563869.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-28
- Publication Date
- 2026-02-27
- Estimated Expiration
- 2035-03-28
AI Technical Summary
Ordinary self-returning sliding doors close quickly, resulting in a large impact force that affects the frame and the top accessories of the door hinge, reducing their service life.
Design a two-stage slow-closing damper that rapidly retracts the piston shaft and then slows down to a closed state after a certain distance. The damping effect is achieved by utilizing the gap and through-hole design between the inner and outer shells, thereby reducing the impact force on the sliding door.
It effectively reduces the pushing force of the sliding door on the top accessories of the door hinge, extends the service life of the sliding door, reduces impact noise, and improves the shopping experience.
Smart Images
Figure CN223952496U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of damper technology, and in particular to a two-stage slow-closing damper. Background Technology
[0002] Self-returning sliding doors are generally required for refrigerated display cases. Ordinary self-returning sliding doors close quickly, generating a significant impact on the frame and producing a knocking sound, negatively affecting the customer shopping experience. While damper limit control significantly reduces the impact on the frame, the damper directly presses against the door, impacting the components at the top of the door hinge, affecting their performance, and reducing the lifespan of the self-returning sliding door. Utility Model Content
[0003] To address the aforementioned technical deficiencies, this invention provides a two-stage slow-closing damper that enables the piston shaft to rapidly retract a certain distance before slowing down to a closed state, thus achieving two-stage slow-closing.
[0004] This utility model discloses a two-stage slow-closing damper, including an outer shell and an inner shell. The inner shell is disposed inside the outer shell. One end of the inner shell and the outer shell are closed and connected as a whole, while the other end of the inner shell and the outer shell are open, with a gap between them. A blocking block is provided at the open end of the outer shell to block the opening of both the outer shell and the inner shell. A shaft hole is provided at the center of the blocking block, through which a piston shaft is inserted. The piston shaft extends into the inner shell, and a piston is provided at the end of the piston shaft inside the inner shell. A gap exists between the piston and the inner wall of the inner shell. A spring is provided inside the inner shell, with its two ends abutting against the piston and the end of the inner shell, respectively. At least one through hole is provided on the side wall of the middle part of the inner shell, penetrating the side wall of the inner shell. An annular groove is provided at the end of the blocking block, and an oil seal is provided in the annular groove. A pressure cap is provided at the open end of the outer shell to restrict the position of the blocking block and the oil seal.
[0005] A cavity is provided at the end of the piston. An oil return channel is provided inside the piston shaft at the end connected to the piston. The oil return channel communicates with the cavity. An oil inlet is provided at the end of the oil return channel, extending towards the side wall of the piston shaft. The oil inlet is located outside the piston. A sealing ball is provided inside the cavity. A sealing plate is provided at the end of the cavity. The sealing plate is used to confine the sealing ball inside the cavity. The sealing plate has a hollow area for supplying oil into and out of the cavity.
[0006] When there are multiple through holes on the side wall of the inner housing, the distance between the two through holes with the furthest axial position must be less than the axial length of the part where the piston mates with the inner housing.
[0007] An annular groove is arranged on the side wall of the plug between the inner housing opening and the outer housing opening, a gap exists between the plug near the inner housing opening and the side wall of the outer housing, the gap is communicated with the annular groove, and the pressure storage cotton is arranged in the annular groove.
[0008] The two-stage slow closing damper can generate damping for a sliding door, realize fast closing by a certain angle and then slow closing until the sliding door is closed, effectively reduce the thrust on the top accessory of the door shaft of the sliding door, and prolong the service life of the sliding door. BRIEF DESCRIPTION OF DRAWINGS
[0009] Figure 1 It is a structural schematic view of the utility model;
[0010] Figure 2 It is a partial enlarged schematic view. Figure 1 DETAILED DESCRIPTION
[0011] In order to further illustrate the technical means and effects adopted by the utility model to achieve the predetermined utility model purposes, the specific embodiments, structures, features and effects according to the utility model are described in detail as follows by combining with the drawings and preferred embodiments.
[0012] Embodiment 1:
[0013] As shown in Figure 1 , Figure 2 The utility model discloses a two-stage slow closing damper, including outer housing 1 and inner housing 2, the inner housing 2 sets up in the inside of outer housing 1, the inner housing 2 and the one end of outer housing 1 are closed and are connected as a whole, and the other end of inner housing 2 and outer housing 1 are all in the open state, and there is a gap between inner housing 2 and outer housing 1. A plug 5 is arranged at the open end of the outer housing 1, the plug 5 is used for plugging the opening of the outer housing 1 and the opening of the inner housing 2, an axle hole is arranged at the center of the plug 5, a piston shaft 4 is arranged in the axle hole, the piston shaft 4 extends to the inside of the inner housing 2, a piston 3 is arranged at the end of the piston shaft 4 in the inner housing 2, there is a gap between the piston 3 and the inner wall of the inner housing 2, a spring 6 is arranged in the inner housing 2, the two ends of the spring 6 abut against the piston 3 and the end of the inner housing 2 respectively, at least one through hole 10 is arranged on the side wall of the middle part of the inner housing 2, the through hole 10 penetrates the side wall of the inner housing 2, an annular groove is arranged at the end of the plug 5, an oil seal 8 is arranged in the annular groove, a gland 9 is arranged at the open end of the outer housing 1, and the gland 9 is used for limiting the position of the plug 5 and the oil seal 8.
[0014] The inner housing 2 is preferably a cylindrical structure, the same end of the inner housing 2 and the outer housing 1 is closed, and after assembly, the closed ends of the two are fixedly connected, and the piston shaft 4 can be arranged in the inner housing 2 as Figure 1 As shown, fixed by bolts and the like, sealed by sealing rings at the bolts. The open ends of the inner shell 2 and the outer shell 1 are closed by the plug 5, which blocks the inside of the inner shell 2 to form an independent cavity, and blocks the inner shell 2 and the outer shell 1 to form an independent cavity. The two independent cavities are communicated through the through hole 10 provided on the side wall of the inner shell 2, which is basically located at the middle part of the axial direction of the inner shell 2, and the specific position can be designed according to the actual demand. The piston 3 inside the inner shell 2 is sliding with the inner shell 2, and there is a small gap between them, which is a conventional design between the piston 3 inside the oil cylinder and the cylinder wall, allowing hydraulic oil to slowly flow from the gap, thereby achieving damping effect. The annular groove is provided at the end of the plug 5, the oil seal 8 is provided inside, and the pressure cap 9 is provided for limiting, which can effectively improve the sealing performance between the piston shaft 4 and the plug 5, avoid the overflow of hydraulic oil from the gap between the piston shaft 4 and the plug 5, and ensure safety. The plug 5 and the outer shell 1 need to be sealed by a sealing ring. The spring 6 always provides an outward pushing force to the piston 3 and the piston shaft 4. The striker 7 can be provided at the end of the piston shaft 4.
[0015] In actual use, when the self-returning sliding door is automatically closed, it contacts the striker 7 at the end of the piston shaft 4. When the sliding door is quickly closed, the piston shaft 4 is subjected to a large pressure, thereby overcoming the spring force of the spring 6 to push the piston shaft 4 and the piston 3 inward. Since the piston 3 does not block the through hole 10 at this time, the hydraulic oil inside the inner shell 2 is pressed during the operation of the piston 3, and enters the cavity between the inner shell 2 and the outer shell 1 through the through hole 10, and part of the hydraulic oil passes through the gap between the piston 3 and the inner shell 2 to the other side of the piston 3. At this time, since the hydraulic oil flows through the through hole 10 and the gap outside the piston 3, the flow is large, so that the piston 3 can run inward relatively quickly until the piston 3 runs to the through hole 10, the through hole 10 is blocked by the piston 3, and the piston 3 continues to run. The hydraulic oil inside the inner shell 2 can only flow slowly to the other side of the piston 3 through the gap outside the piston 3, thereby achieving slow operation of the piston 3. Therefore, during the above operation process, when the self-returning sliding door is closed, the piston shaft 4 is subjected to a force and can run relatively quickly with the sliding door, and during this process, the speed of the sliding door is gradually reduced until the piston 3 blocks the through hole 10, and the sliding door runs slowly with the piston 3 to close the sliding door. Since the piston shaft 4 can run relatively quickly when subjected to the force of the sliding door, it will not cause excessive impact force to the sliding door and cause damage to the sliding door, thereby prolonging the service life of the sliding door.
[0016] A concave cavity 11 is arranged at the end of the piston 3, an oil return channel 12 is arranged inside the piston shaft 4 connected with the end of the piston 3, the oil return channel 12 is communicated with the concave cavity 11, an oil inlet 13 extending to the side wall of the piston shaft 4 is arranged at the end of the oil return channel 12, the oil inlet 13 is located outside the piston 3, a blocking ball 14 is arranged in the concave cavity 11, a blocking piece 15 is arranged at the end of the concave cavity 11, the blocking piece 15 is used to limit the blocking ball 14 in the concave cavity 11, and a hollow area for the oil to enter and exit the concave cavity 11 is arranged on the blocking piece 15. After the door is opened, the pressure on the piston shaft 4 is released, and the piston 3 needs to move to the opening end of the inner shell 2 as soon as possible under the action of the spring 6. However, the gap between the piston 3 and the inner shell 2 is limited, so that the hydraulic oil cannot flow quickly. Therefore, the concave cavity 11 is arranged at the end of the piston 3, the oil return channel 12 is arranged in the piston shaft 4, and the oil inlet 13 is arranged on the side wall of the piston shaft 4. When the piston 3 is reset, the hydraulic oil inlet 13 on the right side of the piston 3 enters the oil return channel 12, and then directly enters the inner shell 2 on the left side of the piston 3 through the oil return channel 12. The hydraulic oil flows quickly in this process, and the piston 3 can be quickly reset. In order to keep the piston 3 running slowly when the door is closed, it is necessary to block the oil return channel 12, so the blocking ball 14 is arranged in the concave cavity 11. When the piston 3 needs to run to the left, the hydraulic oil on the left side of the piston 3 is quickly compressed to generate a large pressure, which pushes the blocking ball 14 to the right, so that the blocking ball 14 blocks the connection port between the concave cavity 11 and the oil return channel 12, thereby realizing the function of one-way check valve. The blocking piece 15 limits the blocking ball 14 in the concave cavity 11, and does not affect the hydraulic oil passing through the blocking piece 15 to enter and exit the concave cavity 11.
[0017] When the through holes 10 on the side wall of the inner shell 2 are multiple, the distance between the two through holes 10 with the farthest axial position needs to be less than the axial length of the part matched with the piston 3 and the inner shell 2. The number of through holes 10 can be determined according to the diameter of the through hole 10 and the actual hydraulic oil flow rate requirement. Normally, 1-3 is enough, and it is preferred to arrange the through holes 10 on the same circumferential position at the same axial position, so that the through holes 10 can be blocked synchronously during the operation of the piston 3. Of course, a small amount of axial distance between the through holes 10 is also acceptable, as long as the axial length range of the part matched with the piston 3 and the inner shell 2 can be covered at the same time, that is, the piston 3 can quickly and timely cover all the through holes 10 during operation, to ensure the reliability of the deceleration of the piston 3.
[0018] An annular groove is arranged on the side wall of the plug 5 between the opening of the inner shell 2 and the opening of the outer shell 1, there is a gap between the plug 5 near the opening of the inner shell 2 and the side wall of the outer shell 1, the gap is communicated with the annular groove, and a pressure storage cotton 16 is arranged in the annular groove.
[0019] Through the design of the pressure-accumulating cotton 16, the oil pressure stability of the hydraulic oil kept inside the inner shell 2 and the outer shell 1 can be effectively increased, and the buffering effect can be improved.
[0020] In the description of the present application, it needs to be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly specified and limited.
[0021] In the description of the present application, it needs to be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection; it can be direct connection, or indirect connection through intermediate medium; it can be the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0022] In the present application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "above", "over" and "on" of the first feature to the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "under" and "under" of the first feature to the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.
[0023] The above merely describes preferred embodiments of the present application and is not intended to limit the present application in any form. Although the present application has been disclosed with preferred embodiments, it is not intended to limit the present application. Any person skilled in the art can make minor changes or modifications to the disclosed technical content to obtain equivalent embodiments with equivalent changes, as long as the changes or modifications do not deviate from the technical solution of the present application. Any simplification, modification, equivalent change or modification of the above embodiments based on the technical essence of the present application still falls within the scope of the technical solution of the present application.
Claims
1. A two-stage slow-closing damper, characterized in that: The device includes an outer shell and an inner shell, with the inner shell disposed inside the outer shell. Both the inner and outer shells are closed at one end and connected as a single unit, while their other ends are open, with a gap between them. A plug is provided at the open end of the outer shell to seal both the outer and inner shell openings. A shaft hole is provided at the center of the plug, through which a piston shaft extends into the inner shell. A piston is located at the end of the piston shaft within the inner shell, with a gap between the piston and the inner wall of the inner shell. A spring is provided inside the inner shell, with its two ends abutting against the piston and the end of the inner shell, respectively. At least one through hole is provided on the side wall of the middle portion of the inner shell, penetrating the side wall. An annular groove is provided at the end of the plug, with an oil seal located within the annular groove. A pressure cap is provided at the open end of the outer shell to restrict the position of the plug and the oil seal.
2. The two-stage slow-closing damper according to claim 1, characterized in that: A cavity is provided at the end of the piston. An oil return channel is provided inside the piston shaft at the end connected to the piston. The oil return channel communicates with the cavity. An oil inlet is provided at the end of the oil return channel, extending towards the side wall of the piston shaft. The oil inlet is located outside the piston. A sealing ball is provided inside the cavity. A sealing plate is provided at the end of the cavity. The sealing plate is used to confine the sealing ball inside the cavity. The sealing plate has a hollow area for supplying oil into and out of the cavity.
3. A two-stage slow-closing damper according to claim 1 or 2, characterized in that: When there are multiple through holes on the side wall of the inner housing, the distance between the two through holes with the furthest axial position must be less than the axial length of the part where the piston mates with the inner housing.
4. A two-stage slow-closing damper according to claim 3, characterized in that: in An annular groove is provided on the side wall of the block between the opening of the inner shell and the opening of the outer shell. There is a gap between the block near the opening of the inner shell and the side wall of the outer shell, and the gap connects to the annular groove. Pressure accumulating cotton is placed in the annular groove.