Damping device with adjustable damping force

Abstract

The damping device comprises an upper connecting plate connected with a pipe clamp accessory and a lower connecting plate connected with a fixed steel frame, the upper portion of the lower connecting plate is fixedly connected with a lower shell containing damping liquid, the lower portion of the upper connecting plate is fixedly connected with an upper shell, and a through hole is formed in the lower end of the upper shell. A sealing sleeve is connected between the upper shell and the lower shell, the lower portion of the upper shell is fixedly connected with a plunger which surrounds the through hole and extends into the damping liquid, an inner cavity of the upper shell is slidably connected with sealing partition plates which are oppositely arranged and connected with adjusting screw rods, and the two sealing partition plates are located on the two sides of the through hole. According to the viscous damper, the negative pressure in the cavity between the two sealing partition plates can be adjusted by adjusting the positions of the two sealing partition plates, so that the liquid level of damping liquid is changed, the contact area of the plunger and the damping liquid is changed, the damping force of the viscous damper is controlled, and the effect that the damping force is adjustable is achieved; and the damping effect of the pipeline is ensured.

Description

Technical Field

[0001] This utility model relates to the field of damper technology, and in particular to a vibration reduction device with adjustable damping force. Background Technology

[0002] Pipeline systems are mainly used in various industrial pipelines such as water supply, drainage, heating, gas supply, long-distance transportation of oil and natural gas, agricultural irrigation, and hydraulic engineering. During operation, sudden changes in the velocity and temperature of the liquid within the pipeline can cause rapid increases or decreases in pressure, resulting in pipeline vibration. Due to the complexity of pipeline systems, it is difficult to eliminate vibration at its source. Prolonged pipeline vibration significantly shortens the pipeline's service life; therefore, vibration damping is necessary to ensure the safe operation of the pipeline system. Viscous dampers are general-purpose devices for pipeline vibration reduction. The principle of viscous dampers is to dissipate the vibrational kinetic energy of the pipeline through the deformation of the damping fluid, converting the vibrational kinetic energy into the heat energy of the damping fluid, reducing the adverse effects of vibration on the pipeline, and ensuring the safe operation of the pipeline system.

[0003] The upper connecting plate of the viscous damper is connected to the pipeline, and the lower connecting plate is connected to the fixed steel frame. During pipeline operation, the viscous damper reduces vibration in real time, ensuring the normal operation of the pipeline. However, the damping force of a conventional viscous damper is basically constant. After being connected to the pipeline, due to different pipeline vibration conditions, the viscous damper may experience insufficient or over-damping during application, which is not conducive to pipeline vibration reduction. Utility Model Content

[0004] To address the technical problem that conventional viscous dampers in existing technologies have a basically constant damping force, and that viscous dampers may experience insufficient or excessive damping force during application, which is detrimental to pipeline vibration reduction, this utility model provides the following technical solution.

[0005] This utility model discloses a damping force adjustable vibration reduction device, comprising an upper connecting plate connected to a pipe clamp accessory and a lower connecting plate connected to a fixed steel frame. A lower housing containing damping fluid is fixedly connected to the upper part of the lower connecting plate, and an upper housing with a through hole at the lower end is fixedly connected to the lower part of the upper connecting plate. A sealing sleeve is connected between the upper housing and the lower housing. A plunger extending into the damping fluid and surrounding the through hole is fixedly connected to the lower part of the upper housing. A sealing partition plate with an adjusting screw is slidably connected to the inner cavity of the upper housing, and the two sealing partition plates are located on both sides of the through hole.

[0006] As a further technical solution, one side of the adjusting screw is threaded to the upper housing, and the end of the adjusting screw near the sealing partition is rotatably connected to the sealing partition through a bearing.

[0007] As a further technical solution, sealing rings are connected to both the upper and lower ends of the sealing partition.

[0008] As a further technical solution, a siphon tube located in the inner cavity of the plunger is fixedly connected to the lower end of the through hole, and the lower end of the siphon tube extends into the damping fluid.

[0009] As a further technical solution, the siphon tube is made of a rigid material.

[0010] As a further technical solution, the sealing sleeve is provided with a number of vent holes.

[0011] The beneficial effects of this utility model are as follows: Two opposing sealing partitions are provided inside the upper housing; a siphon tube connected to the upper housing via a through hole is provided inside the plunger; the lower end of the siphon tube extends into the damping fluid. By adjusting the position of the two sealing partitions, the negative pressure in the chamber between the two sealing partitions can be adjusted, causing a change in the level of the damping fluid and thus a change in the contact area between the plunger and the damping fluid. This controls the damping force of the viscous damper, achieving an adjustable damping force and ensuring the vibration reduction effect of the pipeline. Attached Figure Description

[0012] Figure 1 This is a cross-sectional schematic diagram of the damping force adjustable vibration reduction device of this utility model;

[0013] Figure 2 This is a cross-sectional view along the AA direction of the damping force adjustable vibration reduction device of this utility model;

[0014] In the diagram: 1-Upper connecting plate; 2-Adjusting screw; 3-Bearing; 4-Sealing partition; 5-Sealing ring; 6-Upper housing; 7-Ventilation hole; 8-Sealing sleeve; 9-Plunger; 10-Siphon tube; 11-Damping fluid; 12-Lower housing; 13-Lower connecting plate Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0016] In the description of this utility model, it should be understood that the terms "upper" and "lower" are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model 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 utility model. Furthermore, the terms "first," "second," etc., 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. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0017] like Figure 1 and Figure 2 As shown, this utility model discloses a vibration damping device with adjustable damping force, comprising an upper connecting plate 1 and a lower connecting plate 13 located below the upper connecting plate 1. The upper connecting plate 1 is connected to a pipe clamp accessory for receiving vibrations from the pipe, and the lower connecting plate 13 is connected to a fixed steel frame for supporting and fixing the pipe. A lower housing 12 is fixedly connected to the upper part of the lower connecting plate 13, and the inner cavity of the lower housing 12 contains damping fluid 11.

[0018] In a preferred embodiment, an upper housing 6 is fixedly connected to the lower part of the upper connecting plate 1. The upper housing 6 is a hollow cube structure, and a through hole 14 is provided at the center of the lower end of the upper housing 6. A plunger 9 is fixedly connected to the lower part of the upper housing 6, surrounding the through hole 14, and the lower part of the plunger 9 extends into the lower part of the damping fluid 11. Two opposing sealing partitions 4 are slidably connected to the inner cavity of the upper housing 6. The two sealing partitions 4 are located on both sides of the through hole 14, and each of the two sealing partitions 4 is connected to an adjusting screw 2. One side of the adjusting screw 2 is threaded to the outer wall of the upper housing 6, and the adjusting end of the adjusting screw 2 is located outside the upper housing 6. The end of the adjusting screw 2 near the sealing partition 4 is rotatably connected to the sealing partition 4 through a bearing 3.

[0019] Both the upper and lower ends of the sealing partition 4 are connected to sealing rings 5, which ensures that there is no air leakage between the two sealing partitions 4 and allows adjustment of the pressure between the two sealing partitions 4. Thus, by turning the adjusting screw 2, the two sealing partitions 4 can move closer or further apart, and the pressure between the two sealing partitions 4 will change, causing the cavity between the two sealing partitions 4 to draw in the damping fluid 11 under negative pressure or to expel the damping fluid 11 under positive pressure.

[0020] In a preferred embodiment, a siphon tube 10 located in the inner cavity of the plunger 9 is fixedly connected to the lower end of the through hole 14. The lower end of the siphon tube 10 extends into the damping fluid 11. The siphon tube 10 is made of a rigid material. When the cavity between the two sealing partitions 4 is under negative pressure, the siphon tube 10 can draw up the damping fluid 11 and send it to the cavity between the two sealing partitions 4. When the cavity between the two sealing partitions 4 is under positive pressure, the damping fluid 11 can flow from the cavity between the two sealing partitions 4 into the lower housing 12.

[0021] A sealing sleeve 8 is connected between the upper shell 6 and the lower shell 12. The sealing sleeve 8 is provided with several vent holes 7. The presence of the vent holes 7 facilitates the adjustment of the pressure of the cavity between the two sealing partitions 4 when they are relatively close or relatively far apart, so as to make it a negative pressure or a positive pressure, thereby absorbing or squeezing out the damping fluid 11.

[0022] The working principle of this utility model is as follows: When the damping force of the viscous damper is too large, the distance between the two sealing partitions 4 inside the upper housing 6 is widened by rotating the two adjusting screws 2, so that the inner cavity of the two sealing partitions 4 forms a negative pressure. At this time, the damping fluid 11 in the lower housing 12 will enter the upper housing 6 from the lower housing 12 under the siphon effect of the siphon tube 10. The liquid level of the damping fluid 11 in the lower housing 12 decreases. At this time, the depth of the plunger 9 immersed in the damping fluid 11 decreases, and the contact area between the plunger 9 and the damping fluid 11 decreases. At this time, the damping force generated by the damping fluid 11 on the plunger 9 decreases, thereby reducing the damping force of the viscous damper. When the damping force of the viscous damper is too small, the distance between the two sealing baffles 4 inside the upper housing 6 is reduced by rotating the two adjusting screws 2, so that the inner cavity of the two sealing baffles 4 forms a positive pressure, and the damping fluid 11 inside the upper housing 6 enters the lower housing 12, increasing the contact area between the plunger 9 and the damping fluid 11, thereby increasing its damping force.

[0023] The preferred embodiments and examples of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments and examples. Within the scope of knowledge possessed by those skilled in the art, various changes or equivalent substitutions can be made without departing from the concept of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A damping force adjustable vibration reduction device, comprising an upper connecting plate (1) connected to a pipe clamp accessory and a lower connecting plate (13) connected to a fixed steel frame, wherein a lower shell (12) containing damping fluid (11) is fixedly connected to the upper part of the lower connecting plate (13), characterized in that: The upper connecting plate (1) is fixedly connected to an upper housing (6) with a through hole (14) at the lower end. A sealing sleeve (8) is connected between the upper housing (6) and the lower housing (12). A plunger (9) extending into the damping fluid (11) is fixedly connected to the lower part of the upper housing (6) around the through hole (14). A sealing partition (4) with an adjusting screw (2) is slidably connected to the inner cavity of the upper housing (6). The two sealing partitions (4) are located on both sides of the through hole (14).

2. The damping force adjustable vibration reduction device according to claim 1, characterized in that: The adjusting screw (2) is threaded to the upper housing (6) on one side, and the end of the adjusting screw (2) near the sealing partition (4) is rotatably connected to the sealing partition (4) through the bearing (3).

3. The damping force adjustable vibration reduction device according to claim 1, characterized in that: The sealing partition (4) is connected to sealing rings (5) at both the upper and lower ends.

4. The damping force adjustable vibration reduction device according to claim 1, characterized in that: The lower end of the through hole (14) is fixedly connected to a siphon tube (10) located in the inner cavity of the plunger (9), and the lower end of the siphon tube (10) extends into the damping fluid (11).

5. The damping force adjustable vibration reduction device according to claim 4, characterized in that: The siphon (10) is made of a rigid material.

6. The damping force adjustable vibration reduction device according to claim 1, characterized in that: The sealing sleeve (8) is provided with several vent holes (7).

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