A damper

Abstract

The present application relates to a kind of damper, including cylinder, the piston assembly being arranged in the cylinder, and the piston rod being connected the piston assembly.Therein, the piston assembly is configured to be able to move relative to the piston rod in the first working condition, and it can be rigidly connected with the piston rod in the second working condition.In this way, the position on the piston rod is adjusted by the piston assembly in the first working condition of low-speed low-frequency vibration caused by temperature change, to avoid the stress on the piston rod due to the constraint of damping medium.And, it is also rigidly connected with the piston in the second working condition as high-speed high-frequency vibration by the piston assembly, to normally output damping force externally, so as to achieve the purpose of vibration reduction.In addition, the damper also realizes the one-way flow of damping medium through one-way valve, and cooperates with air bag to realize the quick reset of piston rod during vibration reduction, to improve the damping effect of damper.

Description

Technical Field

[0001] The present invention relates to the technical field of damping and vibration reduction, and in particular to a damper. Background Art

[0002] In engineering applications, structures expand or contract due to temperature fluctuations. When structural deformation is constrained, temperature stress is generated. This stress can negatively impact the strength and stiffness of the structure, reducing its lifespan. When low-speed, low-frequency vibrations occur between structures due to temperature fluctuations, the damping medium constrains the damper's piston rod, generating stress between the structures being damped. Over time, this stress can negatively impact the piston rod's strength and stiffness. Furthermore, deformation caused by the piston rod's own temperature fluctuations can further increase the stress on the rod. Summary of the Invention

[0003] In view of the above problems existing in the prior art, the present invention provides a damper that can effectively prevent the piston rod from being subjected to stress due to temperature changes.

[0004] The technical solution adopted by the present invention to solve the technical problem is to provide a damper, comprising:

[0005] Cylinder body;

[0006] A piston assembly is disposed in the cylinder; and

[0007] A piston rod, connecting the piston assembly,

[0008] The piston assembly is configured to be movable relative to the piston rod in a first working condition and to be rigidly connected to the piston rod in a second working condition.

[0009] Furthermore, the piston assembly includes a first piston disposed in the cylinder body, and a second piston connected to the piston rod in the first piston, wherein the second piston defines a first accommodating chamber and a second accommodating chamber in the first piston for accommodating a locking medium.

[0010] Furthermore, the second piston is configured to allow the locking medium to flow between the first accommodating chamber and the second accommodating chamber only under the first working condition, so that the first piston can move relative to the second piston and the piston rod under the first working condition, and remain stationary relative to the second piston and the piston rod under the second working condition.

[0011] Furthermore, the inner wall of the first piston and the second piston are clearance-matched, so that the locking medium can flow between the first accommodating chamber and the second accommodating chamber under the first working condition.

[0012] Furthermore, the first piston includes a cylinder, and sealing plates are provided at both ends of the cylinder to define a receiving cavity for accommodating the second piston and the locking medium in the cylinder.

[0013] Furthermore, a first end cover and a second end cover are provided at both ends of the cylinder body so as to define a cavity in the cylinder body for accommodating the piston assembly, the damping medium and the airbag.

[0014] Furthermore, a partition connected to the cylinder body is provided in the cavity, and the partition and the piston assembly together define a first chamber located between the first end cover and the piston assembly, a second chamber located between the piston assembly and the partition, and a third chamber located between the partition and the airbag in the cavity.

[0015] Furthermore, a damping hole is provided on the piston assembly, so that the damping medium in the second chamber can flow into the first chamber under the second working condition.

[0016] Furthermore, the cylinder body is provided with a first flow channel connecting the first chamber and the third chamber, and a first one-way valve is provided in the first flow channel. The first one-way valve only allows the damping medium to flow from the first chamber into the third chamber.

[0017] Furthermore, a second flow channel connecting the third chamber and the second chamber is provided on the partition, and a second one-way valve is provided in the second flow channel. The second one-way valve only allows the damping medium to flow from the third chamber into the second chamber.

[0018] The beneficial effects of the present invention are as follows: the present invention provides a damper, comprising a cylinder body, a piston assembly arranged in the cylinder body, and a piston rod connected to the piston assembly. The piston assembly is configured to be movable relative to the piston rod under a first working condition, and to be rigidly connected to the piston rod under a second working condition. In this way, the piston assembly adjusts its position on the piston rod under the first working condition of low-speed and low-frequency vibration caused by temperature changes, thereby avoiding the piston rod from being subjected to stress due to the constraint of the damping medium. Moreover, the piston assembly is rigidly connected to the piston under the second working condition of high-speed and high-frequency vibration to normally output the damping force to the outside, thereby achieving the purpose of vibration reduction. In addition, the damper also realizes the unidirectional flow of the damping medium through a one-way valve, and cooperates with the airbag to realize the rapid resetting of the piston rod during the vibration reduction process, thereby improving the vibration reduction effect of the damper. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below with reference to the accompanying drawings and examples.

[0020] Figure 1Shown is a structural cross-sectional view of a damper.

[0021] In the figures, reference numerals are as follows: 100, damper; 10, cylinder; 11, first end cover; 12, second end cover; 13, cavity; 131, first chamber; 132, second chamber; 133, third chamber; 14, partition; 15, first flow channel; 151, first one-way valve; 16, second flow channel; 161, second one-way valve; 17, airbag;

[0022] 20. Piston assembly; 201. Damping orifice; 21. First piston; 211. Cylinder; 212. Closing plate; 22. Second piston; 23. Accommodation chamber; 231. First accommodating chamber; 232. Second accommodating chamber;

[0023] 30. Piston rod; 31. Limiting part. DETAILED DESCRIPTION

[0024] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention is now described in detail with reference to the accompanying drawings. This figure is a simplified schematic diagram, which only illustrates the basic structure of the present invention in a schematic manner, and therefore only shows the components related to the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0025] refer to Figure 1 As shown, the present invention provides a damper 100 comprising a cylinder 10, a piston assembly 20 disposed within the cylinder 10, and a piston rod 30 connected to the piston assembly 20. A first end cap 11 and a second end cap 12 are provided at each end of the cylinder 10, respectively. The first end cap 11 and the second end cap 12 are sealedly connected to the cylinder 10, thereby defining a cavity 13 within the cylinder 10 for accommodating the piston assembly 20, the damping medium, and the airbag 17. One end of the piston rod 30 is connected to a first vibration source (not shown), while the other end of the piston rod 30 passes through the first end cap 11 and connects to the piston assembly 20. The end of the cylinder 10 facing the second end cap 12 is connected to a second vibration source (not shown). When the distance between the first and second vibration sources continuously changes due to vibration, the piston rod 30 causes the piston assembly 20 to continuously move axially within the cylinder 10, causing the damping medium to flow within the cavity 13 through the damping holes 201 in the piston assembly 20, thereby achieving vibration reduction.

[0026] The first vibration source and the second vibration source may be connected to the damper 100 by welding, bolting, hinged connection, etc. It should be understood that the first vibration source or the second vibration source may vibrate independently or simultaneously at different frequencies or amplitudes.

[0027] In some embodiments, a partition 14 connected to the cylinder body 10 is further disposed within the cavity 13. The partition 14 and the piston assembly 20 together divide the cavity 13 into a first chamber 131 located between the first end cap 11 and the piston assembly 20, a second chamber 132 located between the piston assembly 20 and the partition 14, and a third chamber 133 located between the partition 14 and the airbag 17. When the damper 100 is reducing vibration between the first vibration source and the second vibration source, the damping medium can flow between the second chamber 132 and the first chamber 131 through the damping hole 201 in the piston assembly 20 to generate a damping force for vibration reduction.

[0028] In some embodiments, the cylinder body 10 is provided with a first flow channel 15 connecting the first chamber 131 and the third chamber 133, and the partition plate 14 is provided with a second flow channel 16 connecting the second chamber 132 and the third chamber 133. Damping medium can flow between the first chamber 131, the second chamber 132, and the third chamber 133 through the first flow channel 15 and the second flow channel 16. Preferably, a first one-way valve 151 and a second one-way valve 161 are respectively provided in the first flow channel 15 and the second flow channel 16. The first one-way valve 151 allows the damping medium to flow only from the first chamber 131 through the first flow channel 15 into the third chamber 133, while the second one-way valve 161 allows the damping medium to flow only from the third chamber 133 through the second flow channel 16 into the second chamber 132.

[0029] In some embodiments, when the piston rod 30 of the damper 100 is compressed due to vibration damping, the piston rod 30 pushes the piston assembly 20 toward the second chamber 132, causing the volume of the second chamber 132 to decrease and the volume of the first chamber 131 to increase. Due to the restriction of the second one-way valve 161, the damping medium in the second chamber 132 can only flow into the first chamber 131 through the damping orifice 201 in the piston assembly 20, thereby generating a damping force for vibration reduction. During this process, the piston rod 30 continuously enters the cavity 13, causing the volume of the cavity 13 to decrease. Therefore, the damping medium in the first chamber 131 also flows into the third chamber 133 through the first one-way valve 151 in the first flow channel 15, causing the pressure in the third chamber 133 to increase. The damping medium entering the third chamber 133 compresses the airbag 17, causing the pressure inside the airbag 17 to increase. It is understood that the gas inside the airbag 17 may be nitrogen. The damping medium can be a shear-thinning fluid, such as methyl silicone oil.

[0030] In some embodiments, when the piston rod 30 of the damper 100 is pulled due to vibration reduction, the piston rod 30 drives the piston assembly 20 toward the first chamber 131, causing the volume of the first chamber 131 to decrease and the volume of the second chamber 132 to increase. The damping medium in the first chamber 131 flows into the third chamber 133 through the first one-way valve 151 in the first flow channel 15, and then flows into the second chamber 132 through the second one-way valve 161 in the second flow channel 16. During this process, the volume of the cavity 13 increases as the piston rod 30 continuously leaves the cavity 13. The pressure in the airbag 17 is released, prompting the damping medium in the third chamber 133 to flow rapidly into the second chamber 132, thereby allowing the piston assembly 20 and piston rod 30 to quickly reset during the vibration reduction process, thereby improving the vibration reduction effect.

[0031] refer to Figure 1 As shown, the piston assembly 20 is configured to be movable relative to the piston rod 30 under a first operating condition and to be rigidly connected to the piston rod 30 under a second operating condition. The first operating condition refers to low-speed and low-frequency vibrations occurring between the first vibration source and the second vibration source, such as when the distance between the first vibration source and the second vibration source changes at a low speed and low frequency due to temperature changes. The second operating condition refers to high-speed and high-frequency vibrations occurring between the first vibration source and the second vibration source, such as when the driving components such as the motor in the first vibration source and / or the second vibration source cause the distance between the first vibration source and the second vibration source to change at a high speed and high frequency during operation.

[0032] In some embodiments, the piston assembly 20 includes a first piston 21 disposed on a piston rod 30, and a second piston 22 connected to the piston rod 30 inside the first piston 21. The first piston 21 includes a cylinder 211 coaxially arranged with the cylinder body 10, and a sealing plate 212 disposed at both ends of the cylinder body 211. The sealing plate 212 and the cylinder body 211 together define a receiving chamber 23 for accommodating the second piston 22 and the locking medium. In this embodiment, the outer wall of the cylinder body 211 is sealed with the inner wall of the cylinder body 10. There is a clearance fit between the inner wall of the cylinder body 211 and the second piston 22, and the second piston 22 divides the receiving chamber 23 into a first receiving chamber 231 located on one side of the first chamber 131, and a second receiving chamber 232 located on one side of the second chamber 132. The damping hole 201 is disposed on the cylinder body 211 and passes through the cylinder body 211 in the axial direction.

[0033] In other embodiments, a clearance fit is formed between the outer wall of the barrel 211 and the inner wall of the cylinder 10 to prevent the damping medium from flowing between the first chamber 131 and the second chamber 132. The clearance between the barrel 211 and the cylinder 10 can serve as the damping hole 201 or be used in combination with the damping hole 201.

[0034] In some embodiments, the locking medium is a fluid with shear thickening property. Shear thickening refers to a non-Newtonian fluid behavior in which the viscosity of the system increases by orders of magnitude with increasing shear rate or shear stress.

[0035] In some embodiments, when the damper 100 is in the first working condition, the second piston 22 applies a small shear rate or shear stress to the locking medium. At this time, the locking medium has a low viscosity and good flowability. Therefore, the interaction force between the first piston 21 and the second piston 22 is small. As a result, the piston rod 30 can drive the second piston 22 to move relative to the first piston 21 in the axial direction, thereby adjusting the position of the piston assembly 20 on the piston rod 30. During this process, the locking medium in the accommodation cavity 23 can flow between the first accommodation cavity 231 and the second accommodation cavity 232 through the gap between the first piston 21 and the second piston 22.

[0036] In some embodiments, when the damper 100 is in the second working condition, the second piston 22 applies a large shear rate or shear stress to the locking medium. At this time, the viscosity of the locking medium increases exponentially, and the state of the locking medium approaches that of a solid, so that a rigid connection is formed between the first piston 21 and the second piston 22, i.e., the first piston 21 is stationary relative to the second piston 22 and the piston rod 30. Therefore, the piston rod 30 can drive the piston assembly 20 to move in the axial direction within the cylinder 10.

[0037] In some embodiments, the piston rod 30 penetrates through the end plates 212 at both ends of the cylinder body 211. The end of the piston rod 30 is provided with a limiting portion 31 to cooperatively define the movement range of the first piston 21 on the piston rod 30 with the second piston 22.

[0038] Again, referring to Figure 1 As shown, the working process of the damper 100 provided by the present application in the first working condition is as follows. Since the damper 100 is subjected to low-speed and low-frequency vibration in the first working condition, the locking medium in the piston assembly 20 has a low viscosity and good flowability, and can flow between the first accommodation cavity 231 and the second accommodation cavity 232 through the gap between the first piston 21 and the second piston 22. Therefore, the first piston 21 can move relative to the second piston 22 and the piston rod 30 in the axial direction in the first working condition to balance the forces on both sides of the first piston 21, thereby avoiding the piston rod 30 from bearing structural stress.

[0039] The working process of the damper 100 provided by the present application in the second working condition is as follows. Since the damper 100 is subjected to high-speed and high-frequency vibration in the second working condition, the locking medium in the piston assembly 20 approaches the state of a solid, so that a rigid connection is formed between the first piston 21 and the second piston 22.

[0040] When the piston rod 30 moves the second piston 22 toward the second chamber 132, the first piston 21 also moves toward the second chamber 132. The damping medium in the second chamber 132 can only flow into the first chamber 131 through the damping hole 201 in the first piston 21, thereby generating a damping force for vibration reduction. As the piston rod 30 continues to enter the cavity 13, the volume of the cavity 13 decreases. The damping medium in the first chamber 131 flows into the third chamber 133 through the first one-way valve 151 in the first flow channel 15, causing the pressure in the third chamber 133 to increase. The damping medium entering the third chamber 133 compresses the airbag 17, causing the pressure inside the airbag 17 to increase.

[0041] When the piston rod 30 causes the second piston 22 to move toward the first chamber 131, the second piston 22 also moves toward the first chamber 131. The damping medium in the first chamber 131 flows through the first one-way valve 151 in the first flow channel 15 into the third chamber 133, and then flows through the second one-way valve 161 in the second flow channel 16 into the second chamber 132. During this process, as the piston rod 30 continuously leaves the cavity 13, the volume of the cavity 13 increases. The pressure in the airbag 17 is released, and the damping medium in the third chamber 133 flows rapidly into the second chamber 132. This allows the piston assembly 20 and piston rod 30 to quickly reset during the vibration reduction process, thereby improving the vibration reduction effect of the damper 100.

[0042] When the first vibration source and the second vibration source stop vibrating, the damper 100 no longer bears the vibration load. Due to the presence of the piston rod 30, the effective cross-sectional area of ​​the piston assembly 20 and the piston rod 30 in the first chamber 131 is smaller than the effective cross-sectional area in the second chamber 132. Therefore, the force exerted by the damping medium in the second chamber 132 on the piston assembly 20 is greater than the force exerted by the damping medium in the first chamber 131 on the piston assembly 20. At this time, the piston assembly 20 and the piston rod 30 move toward the first end cover 11. At the same time, the pressure in the airbag 17 is continuously released, causing the damping medium in the third chamber 133 to flow rapidly into the second chamber 132 until the forces at both ends of the piston assembly 20 and the piston rod 30 are balanced. The damper 100 finally completes its reset.

[0043] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; they may refer to mechanical connections; they may refer to direct connections or indirect connections through an intermediate medium; they may refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0044] It should be understood that the terms "length", "width", "up", "down", "front and back", "left and right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0045] While the present invention has been described with reference to preferred embodiments, various modifications may be made and equivalent components may be substituted without departing from the scope of the present invention. In particular, the various technical features described in the various embodiments may be combined in any manner, provided no structural conflicts exist. The present invention is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. A damper comprising: A cylinder body (10), wherein both ends of the cylinder body (10) are provided with a first end cover (11) and a second end cover (12) so as to define a cavity (13) in the cylinder body (10) for accommodating a piston assembly (20), a damping medium and an air bag (17); The piston assembly (20) is disposed in the cylinder (10); and A piston rod (30) is connected to the piston assembly (20), one end of the piston rod (30) is connected to a first vibration source, and one end of the cylinder body (10) facing the second end cover (12) is connected to a second vibration source. in, The piston assembly (20) is configured to be movable relative to the piston rod (30) under a first operating condition and to be rigidly connected to the piston rod (30) under a second operating condition, wherein the first operating condition refers to low-speed and low-frequency vibrations occurring between the first vibration source and the second vibration source, and the second operating condition refers to high-speed and high-frequency vibrations occurring between the first vibration source and the second vibration source. The piston assembly (20) includes a first piston (21) arranged in the cylinder body (10), and a second piston (22) connected to the piston rod (30) in the first piston (21), wherein the second piston (22) defines a first accommodating chamber (231) and a second accommodating chamber (232) for accommodating a locking medium in the first piston (21), and the second piston (22) is configured to only allow the locking medium to flow between the first accommodating chamber (231) and the second accommodating chamber (232) under the first working condition, so that the first piston (21) can move relative to the second piston (22) and the piston rod (30) under the first working condition, and remain stationary relative to the second piston (22) and the piston rod (30) under the second working condition, and the inner wall of the first piston (21) and the second piston (22) are clearance-matched, so that the locking medium can flow between the first accommodating chamber (231) and the second accommodating chamber (232) under the first working condition.

2. The damper according to claim 1, characterized in that The first piston (21) comprises a cylinder (211), and sealing plates (212) are provided at both ends of the cylinder (211) so as to define a receiving chamber (23) for accommodating the second piston (22) and the locking medium within the cylinder (211).

3. The damper according to claim 1, characterized in that A partition (14) connected to the cylinder body (10) is provided in the cavity (13), and the partition (14) and the piston assembly (20) together define a first chamber (131) located between the first end cover (11) and the piston assembly (20), a second chamber (132) located between the piston assembly (20) and the partition (14), and a third chamber (133) located between the partition (14) and the airbag (17) in the cavity (13).

4. The damper according to claim 3, characterized in that The piston assembly (20) is provided with a damping hole (201) for enabling the damping medium in the second chamber (132) to flow into the first chamber (131) under a second working condition.

5. The damper according to claim 3, characterized in that The cylinder body (10) is provided with a first flow channel (15) communicating with the first chamber (131) and the third chamber (133). A first one-way valve (151) is provided in the first flow channel (15). The first one-way valve (151) only allows the damping medium to flow from the first chamber (131) into the third chamber (133).

6. The damper according to claim 5, characterized in that A second flow channel (16) communicating with the third chamber (133) and the second chamber (132) is provided on the partition (14). A second one-way valve (161) is provided in the second flow channel (16). The second one-way valve (161) only allows the damping medium to flow from the third chamber (133) into the second chamber (132).

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