An explosion-proof cavity viscous damper

Abstract

The present invention discloses an explosion-proof cavity viscous damper, belonging to the technical field of structural earthquake resistance and shock absorption. When an earthquake occurs, the structure will vibrate rapidly. The lower piston in the main cylinder of the viscous damper moves reciprocally left and right, squeezing the damping medium through the damping holes. However, due to the small cross-sectional area of the damping holes, it is difficult for the damping medium to quickly follow through the damping holes, resulting in a sharp increase in pressure in the left main cylinder and the right main cylinder, and explosion of the cavity may occur. The present invention provides a liquid passing pipe in the viscous damper to connect the left and right main cylinders, and an explosion-proof cavity shunt device is arranged in the liquid passing pipe. Within the allowable pressure range, the damper works normally; when the pressure exceeds the limit value, the damping medium squeezes the upper piston through the current-limiting pipe, controlling the connecting area of the liquid passing pipe, so that it automatically relieves pressure during the working process of the damper, preventing cylinder explosion. The structure of the present invention is simple, and the pressure is adjusted by mechanical principle, with good safety and durability, and good shock absorption and protection effect.

Description

Technical Field

[0001] The present invention relates to the technical field of dampers for structural earthquake resistance and shock absorption engineering, and particularly to an explosion-proof cavity viscous damper. Background Art

[0002] Earthquakes are one of the main natural disasters threatening the safety of major engineering structures. Therefore, structural shock absorption control has become an effective measure for disaster prevention and mitigation in civil engineering.

[0003] In the current field of structural shock absorption, viscous dampers are a very common shock absorption device. When the structure vibrates, the viscous damper drives the piston inside the structure to move, compressing the damping medium in the main cylinder to pass through the damping holes to generate throttling resistance, achieving the effect of shock absorption and energy dissipation. A viscous damper is an effective damping protection device for building structures and can effectively reduce the seismic response of the structure.

[0004] However, under earthquake action, the piston in the main cylinder will perform rapid reciprocating motion. Due to the small cross-sectional area of the damping holes, the pressure in the main cylinder will increase sharply, resulting in a potential safety hazard of cavity explosion. In this background environment, an explosion-proof cavity viscous damper has emerged. When the pressure in the main cylinder of the damper is too high, it allows the damping medium to pass through the liquid connecting pipe from the left main cylinder to the right main cylinder or from the right main cylinder to the left main cylinder to achieve the purpose of rapid pressure relief. At the same time, within the allowable pressure range, the damping medium passes through the damping holes to generate fluid resistance to achieve the effect of shock absorption and energy dissipation. Summary of the Invention

[0005] In order to solve the above technical problems, the present invention provides a viscous damper with a simple structure that can prevent the pressure of the damping medium from being too high. It can not only improve the effect of shock absorption and energy dissipation but also enhance the safety and durability of the structure. The present invention uses a flow-limiting pressure regulating device to connect the liquid connecting pipe when the pressure difference on both sides is too large, achieving the purpose of regulating the pressure and reducing the pressure difference in the main cylinder chamber.

[0006] The technical solution adopted by the present invention to solve the above technical problems is: an explosion-proof cavity viscous damper, mainly composed of a damping energy dissipation unit and an explosion-proof cavity shunt unit. Both the damping energy dissipation unit and the explosion-proof cavity shunt unit are made of steel such as Q235 and Q345.

[0007] An explosion-proof cavity viscous damper mainly includes a damping energy dissipation unit and an explosion-proof cavity shunt unit; the damping energy dissipation unit consists of a left connecting earring, a secondary cylinder, a piston rod, a right connecting earring, a lower piston, a left main cylinder, a right main cylinder, damping holes, and a blocking device; the explosion-proof cavity shunt unit consists of a liquid connecting pipe, a flow-limiting pipe, a flow-limiting switch, an upper piston, a limiting spring, and piston holes. The limiting spring, the upper piston, and the flow-limiting switch form a pressure control unit.

[0008] When the structure is subjected to earthquake and strong wind, the lower piston moves reciprocally left and right. To prevent the damper from experiencing excessive displacement, especially to prevent the lower piston from blocking the through holes of the liquid passage pipe and the left and right main cylinders, a blocking device is provided in the left and right main cylinders to limit the movement position of the lower piston.

[0009] The explosion-proof cavity shunt unit consists of a liquid passage pipe, a flow-limiting pipe, a flow-limiting switch, an upper piston, a limiting spring, a piston hole, and a pressure control unit. The liquid passage pipe is a steel round pipe, and the lower parts of both ends of the liquid passage pipe are welded to the left and right main cylinders respectively, enabling the left and right main cylinders to communicate. The flow-limiting pipe is a steel round pipe, which is connected to the liquid passage pipe and can shunt the damping medium entering the liquid passage pipe.

[0010] A limiting spring is provided in the pressure control unit. The limiting spring is connected to the upper piston, and the position of the upper piston can be adjusted by the compression of the limiting spring under force and its own deformation recoverability. A flow-limiting switch is provided in the flow-limiting pipe, and the flow-limiting switch will rotate left and right when squeezed by the damping medium.

[0011] A piston hole is provided on the upper piston. The upper piston is connected to the limiting spring, and the displacement of the upper piston is caused by the contraction of the limiting spring to control the area of communication of the liquid passage pipe.

[0012] The cross-sectional area of the liquid passage pipe is set to be three times or more of the cross-sectional area of the damping hole. After connection, the pressure in the left and right main cylinders can be quickly stabilized, ensuring the rapid passage of the damping medium, reducing the influence on the key parameters of the damper, and reducing the risk coefficient.

[0013] The length and model of the limiting spring can be selected according to the preset limit pressure in the left and right main cylinders. Through the length limit in the static state of the spring, the upper piston blocks the liquid passage pipe in the static state, ensuring that when the pressure is within the allowable range, the damping medium flows through the damping hole to achieve the shock absorption effect.

[0014] When the lower piston moves to the left, the lower piston moves to squeeze the damping medium through the damping hole to achieve the energy dissipation effect. At the same time, part of the damping medium enters the flow-limiting pipe, causing the flow-limiting switch to rotate to the left. If the pressure exceeds the pressure limit of the damper, Resistance the damping medium squeezes the limiting spring to push the upper piston, connecting the piston hole and the liquid passage pipe, enabling the damping medium to move from the left main cylinder to the right main cylinder through the liquid passage pipe, thereby quickly reducing the pressure in the single-side main cylinder and achieving the purpose of preventing cylinder explosion.

[0015] When the lower piston moves to the right, the lower piston moves to squeeze the damping medium through the damping holes, achieving the effect of energy dissipation. At the same time, part of the damping medium enters the flow-limiting tube, causing the flow-limiting switch to rotate to the right. If the pressure exceeds the pressure limit of the damper, the damping medium squeezes the limit spring to push the upper piston, connecting the piston hole and the liquid passage tube, so that the damping medium moves from the right main cylinder to the left main cylinder through the liquid passage tube, thus rapidly reducing the pressure of the single-sided main cylinder and achieving the purpose of preventing cylinder explosion.

[0016] Compared with the prior art, the advantages of the present invention are as follows: (1) An explosion-proof cavity viscous damper has a simple structure, can automatically adjust the pressure mechanically, and all components and accessories can be prefabricated and processed in the factory and can be replaced and repaired, which is economical and reasonable; (2) An explosion-proof cavity viscous damper is directly connected to the structure through the left and right connecting ear rings, and the construction is simple and convenient; (3) An explosion-proof cavity viscous damper can ensure the stability of the damper hysteresis curve, has a better shock absorption effect, a higher safety factor, and high structural durability, and can be used at low cost for a long time. Therefore, the explosion-proof cavity viscous damper of the present invention has the advantages of excellent performance, low cost, relatively simple structure, convenient maintenance and replacement, high safety factor, and high structural durability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 It is a schematic diagram of the overall explosion-proof cavity viscous damper;

[0019] Figure 2 It is a schematic diagram of the flow direction of the damping medium of the pressure regulating device and the movement of the upper piston when the lower piston moves to the left;

[0020] Figure 3 It is a schematic diagram of the flow direction of the damping medium of the pressure regulating device and the movement of the upper piston when the lower piston moves to the right;

[0021] Figure 4 It is a schematic elevation view of an explosion-proof cavity viscous damper;

[0022] Figure 5 It is a sectional view taken along line 1-1;

[0023] Figure 6 It is a sectional view of the blocking device.

[0024] Wherein: 1. Left connecting earring; 2. Auxiliary cylinder; 3. Piston rod; 4. Right connecting earring; 5. Lower piston; 6. Left main cylinder; 7. Right main cylinder; 8. Damping hole; 9. Blocking device; 10. Liquid passage pipe; 11. Flow-limiting pipe; 12. Flow-limiting switch; 13. Upper piston; 14. Limiting spring; 15. Piston hole; 16. Pressure control unit. Detailed implementation mode

[0025] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0026] Figure 1 It is a schematic diagram of the overall structure of an explosion-proof cavity viscous damper according to the present invention. As Figure 1 shown, the explosion-proof cavity viscous damper mainly includes a main cylinder, an auxiliary cylinder, a lower piston, a piston rod, a liquid passage pipe, and a pressure control device. The main cylinder is divided into a left main cylinder 6 and a right main cylinder 7, and the left main cylinder 6 and the right main cylinder 7 are filled with the same damping medium. There is a piston rod 3 in the main cylinder, and a lower piston 5 is welded on the piston rod 3. The piston rod 3 and the lower piston 5 can move back and forth along the axial direction of the left main cylinder 6 and the right main cylinder 7. However, under the action of an earthquake, the piston in the main cylinder will perform rapid reciprocating motion. Due to the small cross-sectional area of the damping hole, the pressure in the main cylinder will increase sharply, resulting in a potential safety hazard of explosion of the cavity. The present invention provides an improved method for a traditional viscous damper to achieve controllable adjustment of the pressure in the damper. Its characteristics are that the construction steps are as follows:

[0027] (1) As Figure 1 shown, weld the left side of the prefabricated main cylinder to the right side of the prefabricated auxiliary cylinder 2, weld a left connecting earring 1 to the left side of the auxiliary cylinder 2, weld a right connecting earring 4 to the right side of the piston rod 3, open holes in the upper parts of the left main cylinder 6 and the right main cylinder 7, and connect the liquid passage pipe 10 by seal welding. Sealing parts are provided at each gap or hole.

[0028] (2) As Figure 1 shown, the liquid passage pipe 10 is opened to connect to the flow-limiting pipe 11, and the liquid passage pipe 10 and the flow-limiting pipe 11 form a communication loop.

[0029] (3) As Figure 5 shown, weld the upper end of the limiting spring 14 to the upper side of the pressure control unit 16, and weld the lower end of the limiting spring 14 to the upper piston 13 together, so that the piston hole 15 blocks the liquid passage pipe 10, and a flow-limiting switch 12 that can rotate left and right is arranged in the flow-limiting pipe 11. The above-mentioned entirety constitutes an explosion-proof cavity shunt unit.

[0030] When an explosion-proof cavity viscous damper according to the present invention works, the piston will move back and forth in the main cylinder and the auxiliary cylinder, and the damping medium will generate viscous resistance when passing through the damping hole, thereby achieving the effect of earthquake resistance and damping reduction.

[0031] Those skilled in the art can easily understand that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The same applies to single-rod viscous dampers and other hydraulic shock absorbers. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. An explosion-proof cavity viscous damper mainly includes a damping energy dissipation unit and an explosion-proof cavity shunt unit; the damping energy dissipation unit consists of a left connecting earring (1), a secondary cylinder (2), a piston rod (3), a right connecting earring (4), a lower piston (5), a left main cylinder (6), a right main cylinder (7), and a damping hole (8). It is characterized in that: Blocking devices (9) are arranged on the inner walls of the left main cylinder (6) and the right main cylinder (7); the explosion-proof cavity shunt unit consists of a liquid conduction pipe (10), a flow limiting pipe (11), and a pressure control unit (16); the pressure control unit (16) includes a limiting spring (14), an upper piston (13), and a flow limiting switch (12); the limiting spring (14) is connected to the upper piston (13) by welding, a piston hole (15) is provided on the upper piston (13), and the flow limiting switch (12) is arranged in the flow limiting pipe (11); when the lower piston (5) moves to the left, the squeezed medium passes through the damping hole (8), and part of the medium enters the flow limiting pipe (11), causing the flow limiting switch (12) to rotate to the left to block the left side of the flow limiting pipe (11) and prevent the medium from passing through. When the pressure is too high, the limiting spring (14) is squeezed, causing the upper piston (13) to displace and connecting the piston hole (15) with the liquid conduction pipe (10); when the lower piston (5) moves to the right, the squeezed medium passes through the damping hole (8), and part of the medium enters the flow limiting pipe (11), causing the flow limiting switch (12) to rotate to the right to block the right side of the flow limiting pipe (11) and prevent the medium from passing through. When the pressure is too high, the limiting spring (14) is squeezed, causing the upper piston (13) to displace and connecting the piston hole (15) with the liquid conduction pipe (10).

2. An explosion-proof cavity viscous damper according to claim 1, It is characterized in that: When the lower piston (5) moves left and right, it collides with the blocking device (9), restricting the further displacement of the lower piston (5).

3. An explosion-proof cavity viscous damper according to claim 1, It is characterized in that: The liquid conduction pipe (10) is a circular pipe, and both ends are connected and communicated with the left main cylinder (6) and the right main cylinder (7) respectively.

4. An explosion-proof cavity viscous damper according to claim 1, It is characterized in that: The flow limiting pipe (11) is a circular pipe and is connected and communicated with the liquid conduction pipe (10).

5. An explosion-proof cavity viscous damper according to claim 1, It is characterized in that: The cross-sectional area of the liquid conduction pipe (10) is three times that of the damping hole (8).

6. An explosion-proof cavity viscous damper according to claim 1, It is characterized in that: The length and model of the limiting spring (14) can be selected according to the preset ultimate pressure in the left main cylinder (6) and the right main cylinder (7), and the upper piston (13) blocks the liquid conduction pipe (10) in the static state.

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