Viscous damper

Abstract

The embodiment of the present invention provides a viscous damper, including: a piston, a piston rod, a cylindrical cylinder body, a front sealing sleeve and a rear sealing sleeve, wherein the front sealing sleeve is arranged at the mouth of the cylindrical cylinder body, the rear sealing sleeve is arranged in the cylindrical cylinder body, the piston rod passes through the front sealing sleeve and the rear sealing sleeve in sequence and is inserted into the cylindrical cylinder body, the piston is arranged on the rod body of the piston rod between the front sealing sleeve and the rear sealing sleeve, the sealing cavity between the front sealing sleeve and the rear sealing sleeve is divided into two chambers, the two chambers are filled with damping medium, and also includes a guide tube, the guide tube passes through the piston and is slidably sealed with the piston, the two ends of the guide tube are respectively fixed to the front sealing sleeve and the rear sealing sleeve, and a plurality of guide holes are spaced apart on the guide tube. The solution provided by the embodiment of the present invention is that as the piston moves, the damping force will gradually increase due to the decrease in the number of guide holes for the damping medium to flow into, thereby realizing variable damping effect; the size and number of the guide holes can also be adjusted to realize controllable damping effect.

Description

Technical Field

[0001] The invention relates to the technical field of shock absorption, in particular to a viscous damper. Background Art

[0002] As a commonly used energy-absorbing component, viscous dampers are widely used in energy dissipation and shock absorption projects. Common viscous dampers are mainly composed of pistons, piston rods, cylinders and seals. The piston divides the inner part of the cylinder into two chambers, and the two chambers are filled with viscous damping liquid as the damping medium. There are small holes on the piston or a gap between the piston and the cylinder to allow the damping medium to pass through; when the piston and the cylinder produce relative motion, the piston will squeeze the damping medium in the chamber on one side of its motion direction, and the squeezed damping medium will flow to the other side chamber through the small holes on the piston or the gap between the piston and the cylinder. The damping medium converts the mechanical energy transmitted from the structure into heat energy and dissipates it during high-speed flow, thereby playing a role in shock absorption, buffering and energy consumption.

[0003] As the magnitude of earthquake action varies, rare earthquake action is generally 5 to 6 times that of frequent earthquake action, and its energy consumption demand for the structure will also change. However, the damping effect of traditional viscous dampers is constant. Based on this, how to achieve variable and controllable damping effect of viscous dampers according to changes in earthquake action becomes an urgent need. Summary of the invention

[0004] In view of the above problems, an embodiment of the present invention provides a viscous damper.

[0005] One aspect of the present invention provides a viscous damper, including: a piston, a piston rod, a cylindrical cylinder body, a front sealing sleeve and a rear sealing sleeve, wherein the front sealing sleeve is arranged at the cylinder mouth of the cylindrical cylinder body, the rear sealing sleeve is arranged in the cylindrical cylinder body, the piston rod passes through the front sealing sleeve and the rear sealing sleeve in turn and is inserted into the cylindrical cylinder body, and is slidingly sealed with the front sealing sleeve and the rear sealing sleeve, the piston is arranged on the rod body of the piston rod between the front sealing sleeve and the rear sealing sleeve, and the sealing cavity between the front sealing sleeve and the rear sealing sleeve is divided into two chambers, the two chambers are filled with damping medium, and also includes a guide tube, the guide tube passes through the piston and is slidingly sealed with the piston, the two ends of the guide tube are respectively fixed to the front sealing sleeve and the rear sealing sleeve, and a plurality of guide holes are spaced apart on the guide tube.

[0006] Compared with the prior art, the beneficial effect of the present invention is that when the piston and the cylindrical cylinder body are relatively displaced, the piston squeezes the damping medium in the chamber on one side, and the damping medium in the chamber on the side flows into the guide tube through the guide hole under the action of pressure, and then flows along the guide tube through the guide hole in the chamber on the other side to enter the chamber on the other side, and the damping medium produces a pore shrinkage effect when flowing into and out of the guide hole, and a viscous friction effect when flowing in the guide tube, thereby converting kinetic energy into heat energy and dissipating it; and, as the piston moves, the number of guide holes for the damping medium to flow in gradually decreases, that is, the cross-sectional area of ​​the damping medium circulation decreases, and when the external force remains unchanged, the damping force will gradually increase as the number of guide holes for the damping medium to flow in decreases, thereby realizing variable damping effect; in addition, the size and number of the guide holes can be adjusted according to the damping force required for shock absorption to realize controllable damping effect.

[0007] Optionally, the guide tube is arranged around the piston rod with the axis of the piston rod as the center line.

[0008] Optionally, the piston is located between the front sealing sleeve and the rear sealing sleeve, and the guide holes on the guide pipe are symmetrically arranged on both sides of the piston.

[0009] Optionally, a front ear plate is provided at the end of the piston rod.

[0010] Optionally, a rear ear plate is provided at the bottom of the cylindrical cylinder body. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The drawings described herein are used to provide a further understanding of the present invention, constitute a part of the present application, and do not constitute a limitation of the present invention. In the drawings:

[0012] Figure 1 A schematic structural diagram of a viscous damper provided by an embodiment of the present invention;

[0013] Figure 2 A schematic structural diagram of a flow guide tube provided in an embodiment of the present invention;

[0014] Figure 3 Schematic diagrams of two types of flow guide pipe arrangements provided in embodiments of the present invention, wherein the left side A is the first type and the right side B is the second type;

[0015] Figure 4 A schematic diagram of the working principle of a viscous damper provided in an embodiment of the present invention Figure 1 ;

[0016] Figure 5 A schematic diagram of the working principle of a viscous damper provided in an embodiment of the present invention Figure 2 .

[0017] Among them, there are a piston 1, a piston rod 2, a cylindrical cylinder body 3, a front sealing sleeve 4, a rear sealing sleeve 5, a damping medium 6, a guide tube 7, a guide hole 8, a front ear plate 9, and a rear ear plate 10. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments and the accompanying drawings. Here, the illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0019] See also Figure 1 and Figure 2 A viscous damper provided by an embodiment of the present invention comprises: a piston 1, a piston rod 2, a cylindrical cylinder body 3, a front sealing sleeve 4 and a rear sealing sleeve 5, wherein the front sealing sleeve 4 is arranged at the barrel mouth of the cylindrical cylinder body 3, the rear sealing sleeve 5 is arranged in the cylindrical cylinder body 3, the piston rod 2 passes through the front sealing sleeve 4 and the rear sealing sleeve 5 in sequence and is inserted into the cylindrical cylinder body 3, and is slidably sealed with the front sealing sleeve 4 and the rear sealing sleeve 5, the piston 1 is arranged on the rod body of the piston rod 2 between the front sealing sleeve 4 and the rear sealing sleeve 5, the sealing cavity between the front sealing sleeve 4 and the rear sealing sleeve 5 is divided into two chambers, the two chambers are filled with damping medium 6, and also includes a guide tube 7, the guide tube 7 passes through the piston 1 and is slidably sealed with the piston 1, the two ends of the guide tube 7 are respectively fixed to the front sealing sleeve 4 and the rear sealing sleeve 5, the two ends of the guide tube 7 are sealed by the front sealing sleeve 4 and the rear sealing sleeve 5, and a plurality of guide holes 8 are spaced apart on the guide tube 7.

[0020] In practice, the damping force can be adjusted by changing the number and diameter of the guide tubes 7, and the aperture, position and spacing of the guide holes 8. When designing the product, the large, medium and small earthquake displacements and energy consumption requirements of the structure can be calculated in advance, and then the number and diameter of the guide tubes 7 and the aperture, position and spacing of the guide holes 8 can be designed to achieve the purpose of adjustable energy consumption capacity.

[0021] The guide tube 7 is arranged around the piston rod 2 with the axis of the piston rod 2 as the center line, see Figure 3 A schematic diagram of the arrangement of two groups of flow guide pipes provided in an embodiment of the present invention.

[0022] The piston 1 is located between the front sealing sleeve 4 and the rear sealing sleeve 5 , and the guide holes 8 on the guide pipe 7 are symmetrically arranged on both sides of the piston 1 .

[0023] A front ear plate 9 is provided at the end of the piston rod 2 .

[0024] A rear ear plate 10 is provided at the bottom of the cylindrical cylinder body 3 .

[0025] See also Figure 4 and Figure 5In the figure, the arrow at the position of the piston 1 indicates the direction of piston movement, and the arrow at the position of the guide tube 7 indicates the flow direction of the damping medium 6. The piston 1 moves relative to the cylindrical cylinder 3 and squeezes the damping medium 6 in the chamber on one side of the movement direction, so that a pressure difference is formed in the chambers on both sides of the piston 1. Under the action of the pressure difference, the damping medium 6 enters the guide tube 7 through the guide hole 8 in the chamber on the side, and then enters the chamber on the other side along the guide tube 7 through the guide hole 8 in the chamber on the other side. The damping medium 6 generates a pore contraction effect when flowing into and out of the guide hole 8, and a viscous friction effect when flowing in the guide tube 7, thereby converting kinetic energy into heat energy for dissipation;

[0026] Moreover, as the displacement of the piston 1 increases, the number of the guide holes 8 on the side of the displacement direction of the piston 1 gradually decreases, so that the pressure difference on both sides of the piston 1 increases, thereby increasing the damper output, forming an adaptive mechanism in which the damping force increases with the increase of the piston displacement.

[0027] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A viscous damper, comprising: A piston, a piston rod, a cylindrical cylinder body, a front sealing sleeve and a rear sealing sleeve, wherein the front sealing sleeve is arranged at the barrel mouth of the cylindrical cylinder body, the rear sealing sleeve is arranged in the cylindrical cylinder body, the piston rod passes through the front sealing sleeve and the rear sealing sleeve in sequence and is inserted into the cylindrical cylinder body, and is slidably sealed with the front sealing sleeve and the rear sealing sleeve, the piston is arranged on the rod body of the piston rod between the front sealing sleeve and the rear sealing sleeve, the sealing cavity between the front sealing sleeve and the rear sealing sleeve is divided into two chambers, the two chambers are filled with damping medium, and it is characterized in that it also includes a guide tube, the guide tube passes through the piston and is slidably sealed with the piston, the two ends of the guide tube are respectively fixed to the front sealing sleeve and the rear sealing sleeve, and a plurality of guide holes are spaced apart on the guide tube; The guide tube is arranged around the piston rod with the axis of the piston rod as the center line; The piston is located in the middle of the front sealing sleeve and the rear sealing sleeve, and the guide holes on the guide pipe are symmetrically arranged on both sides of the piston.

2. The viscous damper according to claim 1, characterized in that A front ear plate is arranged at the end of the piston rod.

3. The viscous damper according to claim 1, characterized in that A rear ear plate is arranged at the bottom of the cylindrical cylinder body.

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