A liquid damper with primary and secondary damping orifices

Abstract

This invention provides a liquid damper with primary and secondary damping orifices, comprising a first end cap and a second end cap, an oil injection plug disposed on the first end cap, a sealed chamber formed between the first and second end caps, and a partition component dividing the sealed chamber into a first chamber and a second chamber. The capacity of the first chamber can decrease as the capacity of the second chamber increases. The partition component is provided with a first damping orifice and a second damping orifice connecting the first and second chambers. The provision of the second damping orifice causes the fluid to generate greater viscous resistance and shear stress when passing through the partition component, thereby improving the overall damping effect without making significant modifications to the existing structure.

Description

Technical Field

[0001] This invention relates to the field of damper technology, and in particular to a liquid damper having primary and secondary damping orifices. Background Technology

[0002] Liquid dampers are increasingly widely used in vibration reduction and isolation. The working principle of a liquid damper is based on the viscosity and flow properties of liquids. It consists of a sealed cavity filled with liquid (usually oil). When external vibration or impact is applied, the liquid flows within the cavity. As the liquid flows through the damping orifice, relative motion occurs between the fluid layers, generating viscous resistance. This viscous resistance absorbs and dissipates energy, thereby reducing the vibration of the structure or system. Currently, liquid dampers all employ a single damping orifice design. To improve the damping value of liquid dampers, the damper structure needs to be redesigned. Summary of the Invention

[0003] The purpose of this invention is to solve the technical problem that existing liquid dampers all adopt a single damping orifice structure design, and that the structure of the damper needs to be redesigned in order to improve the damping value of the liquid damper.

[0004] To solve the above-mentioned technical problems, the present invention provides a liquid damper with main and secondary damping orifices, comprising: a first end cap and a second end cap, an oil injection plug disposed on the first end cap, a sealed chamber formed between the first end cap and the second end cap, a partition component dividing the sealed chamber into a first chamber and a second chamber, wherein the capacity of the first chamber can decrease as the capacity of the second chamber increases, and the partition component is provided with a first damping orifice and a second damping orifice connecting the first chamber and the second chamber.

[0005] Furthermore, the first end cap and the second end cap are positioned opposite each other, and the sealed chamber has a cylindrical structure.

[0006] Furthermore, the separating component is a flange disposed between the first end cover and the second end cover.

[0007] Furthermore, the first end cover and the second end cover are movably connected to the flange. The first end cover and the second end cover can be close to or away from the flange. When the first end cover is close to the flange, the second end cover is away from the flange.

[0008] Furthermore, it also includes a first bellows and a second bellows, with a first end cap sealingly connected to one end of the first bellows and the other end of the first bellows sealingly connected to one side of the flange, and a second end cap sealingly connected to one end of the second bellows and the other end of the second bellows sealingly connected to the other side of the flange.

[0009] Furthermore, connecting plates are fixedly installed on both sides of the flange, and the first and second bellows are sealed to the connecting plates, thereby sealing to the flange.

[0010] Furthermore, the diameters of the first damping orifice and the second damping orifice are different.

[0011] Furthermore, the radius of the second damping orifice is 0.64 times the radius of the first damping orifice.

[0012] As can be seen from the above technical solution, the beneficial effects of the present invention are as follows: the setting of the second damping orifice makes the fluid generate greater viscous resistance and shear stress when passing through the separating component, thereby improving the overall damping effect without making significant modifications to the existing structure. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the liquid damper with main and auxiliary damping orifices provided in this application.

[0014] Figure 2 This is a schematic diagram of the flow velocity distribution inside the damping orifice provided in this application.

[0015] Figure 3 This is a schematic diagram of the damper principle provided in this application.

[0016] The reference numerals in the attached drawings are explained as follows: 1. Oil plug; 2. First end cap; 3. First bellows; 31. Second bellows; 4. Connecting plate; 5. Flange; 6. First damping hole; 7. Second damping hole; 8. Second end cap. Detailed Implementation

[0017] Typical embodiments embodying the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various variations in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations herein are for illustrative purposes only and not intended to limit the present invention.

[0018] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0019] To further illustrate the principles and structure of the present invention, preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0020] Please see Figure 1-3 This embodiment provides a liquid damper with primary and secondary damping orifices, including a first end cap 2 and a second end cap 8, and a sealed chamber formed between the two end caps and filled with liquid. A partition component divides the sealed chamber into a first chamber and a second chamber. The partition component is provided with a first damping orifice 6 connecting the first chamber and the second chamber. When external vibration or impact force is applied, the liquid in the first chamber can flow to the second chamber through the first damping orifice 6, and the liquid in the second chamber can also flow to the first chamber through the first damping orifice 6. Taking the liquid flowing from the first chamber to the second chamber as an example, when the liquid in the first chamber flows to the second chamber, the capacity of the first chamber will decrease as the capacity of the second chamber increases.

[0021] The first end cap is provided with an oil filling plug 1, through which external liquid can be injected into the sealed chamber.

[0022] The separator is also provided with a second damping hole 7, which causes the fluid to generate greater viscous resistance and shear stress when passing through the separator, thereby improving the overall damping effect without making significant modifications to the existing structure.

[0023] Furthermore, the radius of the second damping hole 7 is smaller than the radius of the first damping hole 6, so that the damper can generate a larger viscous damping force during operation. The radius of the second damping hole 7 can be 0.6 times or 0.7 times the radius of the first damping hole 6. Preferably, the radius of the second damping hole 7 is 0.64 times the radius of the first damping hole 6. When the radius of the second damping hole 7 is 0.64 times the radius of the first damping hole 6, the maximum damping improvement effect can be achieved, that is, the damping is increased by 1.21 times.

[0024] In this embodiment of the invention, the first end cap 2 and the second end cap 8 are arranged opposite to each other. The sealed chamber has a cylindrical structure. The separating component divides the sealed chamber into a cylindrical first chamber and a second chamber. The separating component is a flange 5 disposed between the first end cap 2 and the second end cap 8. The flange 5 has a first damping hole 6 and a second damping hole 7. Of course, the separating component is not limited to the flange 5, but can also be other components suitable for use as separating components.

[0025] Furthermore, the first end cover 2 and the second end cover 8 are movably connected to the flange 5. The first end cover 2 and the second end cover 8 can be close to or away from the flange 5. When an external impact force is applied to the first end cover 2, the first end cover 2 moves closer to the flange 5, and the capacity of the first chamber decreases. At the same time, the second end cover 8 moves away from the flange 5, and the capacity of the second chamber increases. Conversely, when an external impact force is applied to the second end cover 8, the second end cover 8 moves closer to the flange 5, and the capacity of the second chamber decreases. At the same time, the first end cover 2 moves away from the flange 5, and the capacity of the first chamber increases.

[0026] To enable the first end cap 2 and the second end cap 8 to be movably connected to the flange 5, a first bellows 3 and a second bellows 31 are also included. The first end cap 2 is sealed to one end of the first bellows 3, and the other end of the first bellows 3 is sealed to one side of the flange 5. The second end cap 8 is sealed to one end of the second bellows 31, and the other end of the second bellows 31 is sealed to the other side of the flange 5 (the side away from the first end cap 2). The first end cap 2 and the second end cap 8 are movably connected to the flange 5 through the bellows. When an external impact force is applied to the first end cap 2, the first bellows 3 is compressed, the capacity of the first chamber decreases, and it plays a buffering role. At the same time, the second bellows 31 extends outward under the action of liquid pressure.

[0027] Furthermore, connecting plates 4 are detachably fixed on both sides of the flange 5. The first bellows 3 and the second bellows 31 are sealed to the connecting plates 4, and the connecting plates 4 are sealed to the flange 5. Thus, the first bellows 3 and the second bellows 31 are sealed to the flange 5. With the connecting plates 4, the corresponding first bellows 3 and the second bellows 31 can be removed from the flange 5 by removing the corresponding connecting plates 4, which facilitates the removal and installation of the first bellows 3 and the second bellows 31.

[0028] As another embodiment of the present invention, the liquid damper of the present invention can also be a common cylinder piston rod structure (not shown in the figure), including a cylinder with a sealed chamber formed inside, a first end cap and a second end cap located at both ends of the cylinder, a piston (separating component) located in the sealed chamber to divide the sealed chamber into a first chamber and a second chamber, and a push rod connected to the piston at one end and extending out of the cylinder body at the other end. The difference between this embodiment and the prior art is that the piston is provided with a first damping hole and a second damping hole to improve the viscous damping force when the piston moves, thereby improving the overall effect.

[0029] The damping generated by the fluid flowing through the first / second damping orifice is calculated as follows:

[0030] like Figure 2 As shown, the velocity distribution inside the circular pipe

[0031]

[0032] Let the diameter of the damping orifice be r1, the dynamic viscosity of the damping fluid be μ, and the average flow velocity inside the damping orifice be... The shear stress generated when the liquid flows through the damping orifice is of length l.

[0033] The viscous resistance generated when liquid flows through a damping orifice is F = τ·A

[0034] Surface area A = 2πr1l

[0035] Viscous resistance

[0036] Damping calculation when there is only one damping orifice:

[0037] Let the piston velocity be v, and the cross-sectional area of ​​the cavity be A. p Cavity diameter D, damping orifice diameter d, damping orifice radius r1

[0038] Flow rate through the damping orifice

[0039] Flow velocity within the cavity

[0040] Viscous resistance

[0041] Viscous damping

[0042] Damping calculation when there is a first / second damping orifice:

[0043] The pressure difference across the two damping orifices is equal.

[0044]

[0045] Let the second damping orifice be r2, the first damping orifice be r1, and r2 = mr1.

[0046]

[0047] Obtain the flow velocity relationship within the two damping orifices

[0048] Flow rate of the first damping orifice

[0049] Flow rate of the second damping orifice

[0050] Total flow

[0051] Total fluid damping value

[0052] Let the piston velocity be v, and the cavity volume be A. p

[0053] Total flow rate Q = v·A P

[0054] Total damping force

[0055] Total damping value with first / second damping orifice

[0056] The ratio of total damping with the first / second damping orifice to damping with only the first damping orifice;

[0057]

[0058] When m = 0.64, c2 = 1.21c1

[0059] As can be seen from the formula derivation, in the design of the first / second damping hole, the second damping hole can improve the damping of the structure. When the radius of the second damping hole is 0.64 times the radius of the first damping hole, the maximum damping improvement effect can be achieved, that is, the damping is improved by 1.21 times.

[0060] Although the invention has been described with reference to several typical embodiments, it should be understood that the terminology used is illustrative and exemplary, and not restrictive. Since the invention can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims. Therefore, all variations and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A liquid damper having primary and secondary damping orifices, characterized in that, Includes a first end cap and a second end cap, an oil filling plug disposed on the first end cap, a sealed chamber formed between the first end cap and the second end cap, a partition component dividing the sealed chamber into a first chamber and a second chamber, the capacity of the first chamber can decrease as the capacity of the second chamber increases, and the partition component is provided with a first damping hole and a second damping hole connecting the first chamber and the second chamber. The first damping orifice and the second damping orifice have different diameters; The radius of the second damping orifice is 0.64 times the radius of the first damping orifice.

2. The liquid damper with primary and secondary damping orifices according to claim 1, characterized in that, The first end cap and the second end cap are positioned opposite each other, and the sealed chamber has a cylindrical structure.

3. The liquid damper with primary and secondary damping orifices according to claim 1, characterized in that, The separating component is a flange disposed between the first end cover and the second end cover.

4. The liquid damper with primary and secondary damping orifices according to claim 3, characterized in that, The first end cover and the second end cover are movably connected to the flange. The first end cover and the second end cover can be close to or away from the flange. When the first end cover is close to the flange, the second end cover is away from the flange.

5. The liquid damper with primary and secondary damping orifices according to claim 4, characterized in that, It also includes a first bellows and a second bellows. The first end cap is sealed to one end of the first bellows, and the other end of the first bellows is sealed to one side of the flange. The second end cap is sealed to one end of the second bellows, and the other end of the second bellows is sealed to the other side of the flange.

6. The liquid damper with primary and secondary damping orifices according to claim 5, characterized in that, Connecting plates are fixedly installed on both sides of the flange. The first and second bellows are sealed to the connecting plates, thereby sealing to the flange.

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