Damper

Abstract

The invention relates to a damper which comprises a cylinder body, a piston assembly arranged in the cylinder body and a piston rod connected with the piston assembly. Wherein the piston assembly is configured to move relative to the piston rod under a first working condition, and can be rigidly connected with the piston rod under a second working condition. In this way, the position of the piston assembly on the piston rod is adjusted under the first working condition that low-speed and low-frequency vibration is caused by temperature changes, and the situation that the piston rod bears stress due to constraint of a damping medium is avoided. In addition, the piston assembly is in rigid connection with the piston under the second working condition of high-speed and high-frequency vibration to normally output damping force outwards, and therefore the purpose of vibration reduction is achieved. In addition, the damper achieves one-way flowing of the damping medium through a one-way valve and is matched with an air bag to achieve rapid resetting of the piston rod in the vibration reduction process, and the vibration reduction effect of the damper is improved.

Description

Technical Field

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

[0002] In engineering applications, due to changes in the temperature field, the structure will expand or contract. When the deformation of the structure is constrained, temperature stress will be generated. Temperature stress will have an adverse effect on the strength and stiffness of the structure, reducing the life of the structure. When low-speed and low-frequency vibrations occur between structures due to temperature changes, the piston rod of the damper will generate certain stress between the structures that are being damped due to the constraints of the damping medium. Such stress will have an adverse effect on the strength and stiffness of the piston rod under long-term action. In addition, the deformation caused by the temperature change of the piston rod itself will further increase the stress on the piston rod. Summary of the invention

[0003] Based on the above problems existing in the prior art, the present invention provides a damper which 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, connected to 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] Further, 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] Further, 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, a second one-way valve is provided in the second flow channel, and 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: a damper provided by the present invention comprises 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 able to move 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 preventing 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 in conjunction with the accompanying drawings and embodiments.

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

[0021] Among them, the reference numerals in the figure are: 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 hole; 21, first piston; 211, cylinder; 212, sealing plate; 22, second piston; 23, receiving chamber; 231, first receiving chamber; 232, second receiving 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 in conjunction with the accompanying drawings. This figure is a simplified schematic diagram, which only illustrates the basic structure of the present invention in a schematic manner, so it only shows the composition 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, a damper 100 provided by the present invention comprises a cylinder 10, a piston assembly 20 disposed in the cylinder 10, and a piston rod 30 connected to the piston assembly 20. The first end cover 11 and the second end cover 12 are respectively disposed at both ends of the cylinder 10, and the first end cover 11 and the second end cover 12 are sealed and connected to the cylinder 10, so as to define a cavity 13 for accommodating the piston assembly 20, the damping medium, and the airbag 17 in the cylinder 10. One end of the piston rod 30 is connected to a first vibration source (not shown in the figure), and the other end of the piston rod 30 passes through the first end cover 11 and is connected to the piston assembly 20. The end of the cylinder 10 facing the second end cover 12 is connected to a second vibration source (not shown in the figure). When the distance between the first vibration source and the second vibration source changes continuously due to vibration, the piston rod 30 causes the piston assembly 20 to continuously move in the axial direction in the cylinder 10, so that the damping medium flows through the damping hole 201 on the piston assembly 20 in the cavity 13, 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 separately, or both may vibrate simultaneously at different frequencies or amplitudes.

[0027] In some of the embodiments, a partition 14 connected to the cylinder body 10 is further provided in 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 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. When the damper 100 reduces 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 on the piston assembly 20 to generate a damping force for vibration reduction.

[0028] In some embodiments, a first flow channel 15 connecting the first chamber 131 and the third chamber 133 is provided on the cylinder body 10, and a second flow channel 16 connecting the second chamber 132 and the third chamber 133 is provided on the partition plate 14. The 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 check valve 151 and a second check valve 161 are respectively provided in the first flow channel 15 and the second flow channel 16. The first check valve 151 allows the damping medium to flow only from the first chamber 131 to the third chamber 133 through the first flow channel 15, and the second check valve 161 allows the damping medium to flow only from the third chamber 133 to the second chamber 132 through the second flow channel 16.

[0029] In some embodiments, when the piston rod 30 of the damper 100 is compressed due to vibration reduction, the piston rod 30 pushes the piston assembly 20 to move toward the second chamber 132, so that the volume of the second chamber 132 is reduced and the volume of the first chamber 131 is increased. 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 hole 201 on the piston assembly 20, thereby generating a damping force for vibration reduction. In this process, since the piston rod 30 continuously enters the cavity 13, the volume of the cavity 13 is reduced. Therefore, the damping medium in the first chamber 131 will also flow into the third chamber 133 through the first one-way valve 151 in the first flow channel 15, so that the pressure in the third chamber 133 increases. The damping medium entering the third chamber 133 will compress the airbag 17, so that the pressure inside the airbag 17 increases. It can be understood that the gas inside the airbag 17 can be nitrogen. The damping medium may 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 to move toward the first chamber 131, so that the volume of the first chamber 131 decreases and the volume of the second chamber 132 increases. 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. In this process, the volume of the cavity 13 increases because the piston rod 30 continuously leaves the cavity 13. The pressure in the airbag 17 is released and causes the damping medium in the third chamber 133 to flow quickly into the second chamber 132, so that the piston assembly 20 and the piston rod 30 can be quickly reset during the vibration reduction process to improve 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 in a first operating condition, and to be rigidly connected to the piston rod 30 in 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 the distance between the first vibration source and the second vibration source changing 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 the driving components such as the motor in the first vibration source and / or the second vibration source causing 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 penetrates the cylinder body 211 in the axial direction.

[0033] In some other embodiments, the outer wall of the barrel 211 is gap-matched with the inner wall of the cylinder 10 so that the damping medium flows between the first chamber 131 and the second chamber 132. The gap between the barrel 211 and the cylinder 10 can be used as the damping hole 201, or used in combination with the damping hole 201.

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

[0035] In some embodiments, when the damper 100 is in the first working condition, the shear rate or shear stress of the second piston 22 on the locking medium is small. At this time, the viscosity of the locking medium is low and the fluidity is good. Therefore, the interaction force between the first piston 21 and the second piston 22 is small. Therefore, the piston rod 30 can drive the second piston 22 to move in the axial direction relative to the first piston 21, thereby adjusting the position of the piston assembly 20 on the piston rod 30. In this process, the locking medium in the accommodating chamber 23 can flow between the first accommodating chamber 231 and the second accommodating chamber 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 shear rate or shear stress of the second piston 22 on the locking medium is relatively large. At this time, the viscosity of the locking medium increases exponentially, and the state of the locking medium is close to solid, so that a rigid connection is formed between the first piston 21 and the second piston 22, that is, 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 in the cylinder body 10.

[0037] In some embodiments, the piston rod 30 passes through the sealing plates 212 at both ends of the cylinder 211. The end of the piston rod 30 is provided with a limiting portion 31 so as to limit the movement range of the first piston 21 on the piston rod 30 together with the second piston 22.

[0038] Recombination Figure 1 As shown, the working process of the damper 100 provided by the present invention under the first working condition is as follows. Since the damper 100 is subjected to low-speed and low-frequency vibration under the first working condition, the locking medium in the piston assembly 20 has low viscosity and good fluidity, and can flow between the first accommodating chamber 231 and the second accommodating chamber 232 through the gap between the first piston 21 and the second piston 22. Therefore, the first piston 21 can move in the axial direction relative to the second piston 22 and the piston rod 30 under the first working condition, so as to balance the forces on both sides of the first piston 21, thereby preventing the piston rod 30 from being subjected to structural stress.

[0039] The working process of the damper 100 provided by the present invention 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 is close to 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 moves toward the second chamber 132 together. The damping medium in the second chamber 132 can only flow into the first chamber 131 through the damping hole 201 on the first piston 21, thereby generating a damping force for vibration reduction. As the piston rod 30 continuously enters the cavity 13, the volume of the cavity 13 decreases. The damping medium in the first chamber 131 will flow 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 will compress the airbag 17, causing the pressure inside the airbag 17 to increase.

[0041] When the piston rod 30 moves the second piston 22 toward the first chamber 131, the second piston 22 moves toward the first chamber 131 together. 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. In this process, the volume of the cavity 13 increases as the piston rod 30 continuously leaves the cavity 13. The pressure of the airbag 17 is released, and the damping medium in the third chamber 133 is caused to flow quickly into the second chamber 132, so that the piston assembly 20 and the piston rod 30 can be quickly reset during the vibration reduction process, so as to improve 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 the reset.

[0043] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, it can be a mechanical connection, it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front and back", "left and right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the 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 a limitation on the present invention.

[0045] Although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced by equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A damper comprising: Cylinder body (10); A piston assembly (20) is disposed in the cylinder body (10); as well as A piston rod (30) connected to the piston assembly (20), The piston assembly (20) is configured to be movable relative to the piston rod (30) under a first working condition, and to be rigidly connected to the piston rod (30) under a second working condition.

2. The damper according to claim 1, characterized in that The piston assembly (20) comprises 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) in the first piston (21) for accommodating a locking medium.

3. The damper according to claim 2, characterized in that: The second piston (22) is configured to allow only 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.

4. The damper according to claim 3, characterized in that: 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.

5. The damper according to claim 2, 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) in the cylinder (211) for accommodating the second piston (22) and the locking medium.

6. The damper according to any one of claims 1 to 5, characterized in that: A first end cover (11) and a second end cover (12) are provided at both ends of the cylinder body (10) so as to define a cavity (13) in the cylinder body (10) for accommodating the piston assembly (20), the damping medium and the air bag (17).

7. The damper according to claim 6, characterized in that A partition (14) connected to the cylinder body (10) is arranged in the cavity (13); the partition (14) and the piston assembly (20) together define in the cavity (13) 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).

8. The damper according to claim 7, 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.

9. The damper according to claim 7, 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).

10. The damper according to claim 9, characterized in that The partition plate (14) is provided with a second flow channel (16) connecting the third chamber (133) and the second chamber (132); 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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