CN214404471U

CN214404471U - Viscous damper for one-way non-return movement of liquid

Info

Publication number: CN214404471U
Application number: CN202120334617.2U
Authority: CN
Inventors: 付兴; 郭代恩瑞; 李宏男; 李钢; 刘慧娟; 董志骞
Original assignee: Dalian University of Technology
Current assignee: Dalian University of Technology
Priority date: 2021-02-05
Filing date: 2021-02-05
Publication date: 2021-10-15
Anticipated expiration: 2031-02-05

Abstract

The utility model provides a viscous damper of one-way contrary motion that ends of liquid belongs to civil engineering structure vibration control technical field, and this viscous damper includes cylinder, end cover, connecting piece, guide arm, sealing member, piston etc. wherein is filled with viscous damping liquid in the cylinder. The piston reciprocates along with the guide rod by external excitation, pressure difference is generated in the cylinder barrels on the left side and the right side of the piston, viscous fluid flows through the throttling hole and moves in the cavity in a one-way circulating mode, viscous damping force is generated, and the purposes of energy consumption and vibration reduction are achieved. The utility model discloses replace general straight-through orifice with ball check valve, when the piston moved left, upper portion ball check valve opened, and the fluid passes through the orifice by high pressure differential's left chamber and flows into right chamber. The utility model discloses simple structure has advantages such as the intensification is even, can passively adjust, speed index is controllable.

Description

Viscous damper for one-way non-return movement of liquid

Technical Field

The utility model belongs to the technical field of civil engineering structure vibration control, specifically indicate a viscous damper that can make the one-way circulation of fluid flow.

Background

Viscous dampers are velocity dependent dissipative vibration dampers that use the viscosity of a fluid to provide damping to dissipate vibrational energy. The energy-saving composite material has the characteristics of good energy consumption performance, no static rigidity, simplicity and convenience in construction, easiness in installation and the like, and is widely applied to actual engineering. The viscous damper is composed of a cylinder barrel, a piston, viscous fluid, a guide rod and the like. The cylinder is filled with viscous fluid, the piston can reciprocate in the cylinder, and the piston is provided with a proper amount of small holes. When the structure makes the cylinder barrel and the piston move relatively due to deformation, viscous fluid is forced to flow through the small hole, so that damping force is generated, vibration energy is eliminated through viscous consumption, and the purpose of vibration reduction is achieved. As a typical velocity-dependent damper, the flow rate of the viscous fluid is a key factor affecting performance. The energy dissipation component of the traditional viscous damper is mainly a through hole, and the adjustability and the designability of the speed index of the traditional viscous damper are poor. In order to reduce the wind vibration and the mechanical oscillation of engineering structure, the utility model discloses based on the characteristics of spherical check valve, provided one kind and can made liquid one-way motion's viscous damper, the device has the advantages such as the intensification is even, can passively adjust, speed index is controllable, will be favorable to promoting the security and the stability of structure, and market prospect is very wide.

SUMMERY OF THE UTILITY MODEL

The utility model provides a viscous damper for one-way non-return movement of liquid for vibration control of structure.

The technical scheme of the utility model:

a viscous damper for one-way non-return motion of liquid comprises a cylinder barrel 1, an end cover 2, a connecting piece 9, a guide rod 3, a sealing piece 4, a piston 5, viscous fluid 8 and a nitrogen accumulator 10;

embedded end covers 2 are arranged at two ends of the cylinder barrel 1, a connecting piece 9 is connected outside the end cover 2 at one end, and the three parts form a shell of the damping device;

a piston 5 is arranged in the cylinder barrel 1, and the guide rod 3 penetrates through the end cover 2 to be connected with the piston 5 to drive the piston 5 to axially move;

sealing elements 4 are arranged between the end cover 2 and the inner wall of the cylinder barrel 1, between the piston 5 and the inner wall of the cylinder barrel 1 and between the end cover 2 and the guide rod 3, so that liquid is prevented from overflowing;

the piston 5 comprises a throttle hole 6, a ball check valve 7 and a ball guide net; the ball-shaped check valve 7 is opened and closed by the short-stroke rolling of the small ball in the check valve cavity, and a ball guide net is arranged at the junction of the check valve cavity and the throttling hole 6 in order to ensure that the small ball can smoothly enter the cavity when the viscous fluid 8 flows; the orifice 6 is intersected with the cavity of the check valve, the angle of the orifice is determined according to the actual engineering requirement, and the diameter of the orifice is smaller than that of the cavity of the check valve; when the piston 5 moves to the left, the ball check valve 7 at the upper part of the piston 5 is opened, and the viscous fluid 8 flows from the left to the right; when the piston 5 moves rightward, the lower ball check valve 7 opens and the viscous fluid 8 flows from right to left;

the nitrogen accumulator 10 is a damper auxiliary adjusting device and is arranged in the cylinder barrel 1 to balance the pressure change in the rigid body.

The viscous fluid 8 material is suitable for meeting the conditions of stable performance, small environmental influence, high viscosity, good fluidity, no aging and air drying problems and the like, and can be used for viscous fluids such as methyl silicone oil, silicon-based adhesive and the like.

The utility model discloses a theory of operation:

when the damper guide rod is excited by the outside to generate a leftward movement trend, damping media in the left cavity of the damper can be extruded, so that the pressure of the left cavity is increased, the pressure of the right cavity is reduced, pressure difference is generated between two communicated cavities in the damper cylinder body, liquid has a trend of flowing from left to right, the upper spherical check valve is opened at the moment, and fluid flows into the low-pressure right cavity from the high-pressure left cavity through the throttling hole. The lower ball check valve is closed at this time, and the liquid is prevented from flowing from right to left; similarly, when the piston moves to the right, the upper ball check valve closes and the lower ball check valve opens, and liquid flows from right to left; the liquid circulates clockwise in the right cavity to generate viscous damping force, thereby playing the role of energy consumption and vibration reduction.

The utility model has the advantages that:

(1) the damper enables molecules of the viscous liquid to rub with each other through axial movement of the piston, input energy is converted into heat energy to be dissipated into air, the flowing speed of the viscous liquid is controlled in a mode of adjusting the weight of a ball body in the ball-shaped check valve and the slope of the cavity, the throttling hole is opened when the speed exceeds a certain threshold value, working energy consumption is achieved, and the requirement of controllable speed index is met.

(2) The damper adopts a spherical check valve to replace a common straight-through orifice, so that liquid circulates in the cavity in a one-way mode, and the temperature rise is more uniform.

(3) The damper can passively adjust the size of the throttling hole, avoids using electromagnetism to adjust the size of the throttling hole, does not depend on external power supply, and is higher in reliability.

(4) The damper can achieve the purpose of different tension and compression damping coefficients by controlling the diameter and the number of the throttling holes, and has strong applicability;

(5) the damper is simple in structure and convenient to install and detach, can be used for seismic resistance and wind resistance of a newly-built structure, and can be widely applied to seismic reinforcement or post-seismic repair engineering of an existing structure.

Drawings

Fig. 1 is a longitudinal sectional view of a viscous damper for one-way check motion of liquid according to an embodiment of the present invention;

fig. 2 is a cross-sectional view of a viscous damper for one-way check motion of liquid according to an embodiment of the present invention;

fig. 3(a) is a partial cross-sectional view of a closed state of a ball check valve of a viscous damper for one-way check motion of liquid according to an embodiment of the present invention;

fig. 3(b) is a partial sectional view of an opened state of a ball check valve of a viscous damper with one-way check motion of liquid according to an embodiment of the present invention;

in the figure: 1, a cylinder barrel; 2, end cover; 3, a guide rod; 4, a sealing element; 5, a piston; 6 orifice; 7 a ball check valve; 8 a viscous fluid; 9 connecting pieces; 10 nitrogen accumulator.

Detailed Description

In order to make the objects, features and advantages of the present invention more obvious and understandable, the drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solutions in the embodiments of the present invention, and obviously, the embodiments described below are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Referring to fig. 1 to 3(a) and 3(b), an embodiment of the viscous damper for one-way check motion of liquid according to the present invention includes a cylinder 1; 2, end cover; 3, a guide rod; 4, a sealing element; 5, a piston; 6 orifice; 7 a ball check valve; 8 a viscous fluid; 9 connecting pieces; 10 nitrogen accumulator.

In the embodiment, the cylinder barrel and the end cover jointly form the shell of the whole damping device, and the damper cavity is divided into a left part and a right part by the piston with the throttling hole;

a sealing element is arranged between the guide rod and the end cover to ensure the tightness of the damper and prevent viscous fluid in the cavity from flowing out, and the sealing element is arranged between the piston and the cylinder barrel to increase the tightness of the damper and ensure that the viscous fluid flows only through a throttling hole on the piston;

the top end of the guide rod is provided with a piston, a throttling hole is reserved on the piston, and a ball-shaped check valve is arranged in the hole, so that viscous fluid can flow only in a fixed direction, and meanwhile, in order to enable the small ball to roll smoothly, a ball guide net is arranged at the junction of the ball-shaped check valve and the throttling hole to guide the small ball to slide;

referring to fig. 3(a) and 3(b), the viscous fluid flowing along the set direction pushes the ball to slide into the cavity along the drainage net, so that the fluid can smoothly pass through the orifice.

When the structure vibration happens, the guide rod can be driven to axially slide, the movement enables the piston to move, so that the movement of the viscous fluid in the damper cavity is caused, the damper cavity is divided into two parts by the piston, the movement of the piston forms pressure difference between the two cavities, the viscous fluid flows between the two cavities through the throttling hole, and the liquid can only flow in a certain direction under the action of the spherical check valve, so the viscous fluid can only flow in the cavity in a specified direction, so that the heat generation is more uniform, and the energy dissipation is more uniform.

Design the utility model discloses the time need pay attention to: firstly, the number and the aperture size of the throttling holes on the damper piston can be adjusted according to actual requirements; secondly, the drainage net has the function that the small ball can smoothly enter the spherical check valve, the installation position is at the junction of the spherical check valve and the throttling hole, and the angle is the same as that of the check valve; thirdly, the small ball in the throttling hole can be solid or hollow, and the actual diameter of the specific material can be adjusted as required.

The above embodiments of the present invention are not right the utility model discloses the limited protection scope, the utility model discloses an embodiment is not limited to this, all kinds of basis according to the above-mentioned of the utility model discloses an under the above-mentioned basic technical thought prerequisite of the utility model, right according to ordinary technical knowledge and the conventional means in this field the modification, replacement or the change of other multiple forms that above-mentioned structure made all should fall within the protection scope of the utility model.

Claims

1. The viscous damper for the one-way non-return motion of the liquid is characterized by comprising a cylinder barrel (1), an end cover (2), a connecting piece (9), a guide rod (3), a sealing piece (4), a piston (5), viscous fluid (8) and a nitrogen accumulator (10);

embedded end covers (2) are arranged at two ends of the cylinder barrel (1), a connecting piece (9) is connected outside the end cover (2) at one end, and the embedded end covers, the end cover (2) and the connecting piece form a shell of the damping device;

a piston (5) is installed in the cylinder barrel (1), and the guide rod (3) penetrates through the end cover (2) to be connected with the piston (5) to drive the piston (5) to axially move;

sealing elements (4) are arranged between the end cover (2) and the inner wall of the cylinder barrel (1), between the piston (5) and the inner wall of the cylinder barrel (1), and between the end cover (2) and the guide rod (3) to prevent liquid from overflowing;

the piston (5) comprises a throttling hole (6), a ball check valve (7) and a ball guide net; the ball-shaped check valve (7) is opened and closed by the short-stroke rolling of the small ball in the check valve cavity, and a ball guide net is arranged at the junction of the check valve cavity and the throttling hole (6) in order to ensure that the small ball can smoothly enter the cavity when the viscous fluid (8) flows; the throttle hole (6) is intersected with the cavity of the check valve, the angle of the throttle hole is determined according to the actual engineering requirement, and the diameter of the throttle hole is smaller than that of the cavity of the check valve; when the piston (5) moves leftwards, the ball check valve (7) at the upper part of the piston (5) is opened, and the viscous fluid (8) flows from left to right; when the piston (5) moves to the right, the lower ball check valve (7) is opened, and the viscous fluid (8) flows from the right to the left;

the nitrogen accumulator (10) is an auxiliary damper adjusting device and is arranged in the cylinder barrel (1) to balance the pressure change in the rigid body.