Single-rod viscous damper

Abstract

The single-rod viscous damper comprises a cylinder barrel, an upper end cover, a lower end cover, a piston and a piston rod, the upper end cover and the lower end cover are fixedly connected with the cylinder barrel, the piston and the piston rod are arranged in the cylinder barrel and divide an inner cavity of the cylinder barrel into a rod cavity and a rodless cavity, and the piston is fixedly connected with the piston rod. An energy accumulator and a Tesla valve are further arranged outside the cylinder barrel, the energy accumulator is connected to the lower end cover through a first pipeline, the Tesla valve is connected to the upper end cover and the lower end cover through a second pipeline, a first fluid channel is formed in the upper end cover, and a second fluid channel is formed in the lower end cover. The rodless cavity is communicated with the energy accumulator through the first pipeline, the rodless cavity is further communicated with the rod cavity through the second pipeline via the Tesla valve, by reasonably setting all size parameters of the V-shaped channel and the Tesla valve, the tension and pressure of the damper can be consistent, the Tesla valve and the energy accumulator have the compensation and pressure stabilization effects, and it is guaranteed that the performance of the damper is stable.

Description

Technical Field

[0001] The utility model relates to the technical field of dampers, in particular to a single-rod viscous damper. Background Art

[0002] Viscous dampers are made based on the principle that fluid movement, especially when fluid passes through a throttle hole, will produce viscous resistance. Viscous dampers are widely used in engineering, such as buildings, bridges, ships and other fields. Viscous dampers can effectively absorb and consume energy and reduce the vibration and deformation of the structure. Viscous dampers include pistons, piston rods, cylinders, viscous fluids and guide support structures. At present, the throttle hole of the viscous damper is usually set on the piston. When the piston reciprocates in the cylinder, the viscous fluid generates a damping force through the throttle hole, thereby consuming energy.

[0003] In the design of viscous dampers, double-rod viscous dampers and single-rod viscous dampers are two common structural forms. Double-rod viscous dampers have two piston rods, one on each side of the cylinder body. This structure allows the piston rods on both sides of the double-rod viscous damper to enter or exit the cylinder body at the same time when the piston moves, thereby maintaining the stability of the viscous medium volume in the rodless chamber. This design effectively avoids the compression of the medium volume or the "cavitation" phenomenon, so that the output of the damper during the stretching and compression process remains consistent. However, the double-rod viscous damper will increase the length of the damper, which makes it impossible to install in many cases; while the single-rod viscous damper only has a piston rod installed on one side of the piston, located on one side of the cylinder body. Compared with the double-rod viscous damper, the single-rod viscous damper has a larger stroke and a more compact structure. However, due to the structural characteristics of the single-rod viscous damper, when the piston moves, the viscous medium in the rodless chamber will produce volume compression or "cavitation" due to the entry or exit of the piston rod; therefore, the single-rod viscous damper usually requires A volume compensation device should be used to solve the structural problem and ensure the normal operation of the damper. After the volume compensation device was introduced, the problem of the single-rod viscous damper not being able to work normally due to the compression of the viscous medium was indeed solved. However, due to the presence of an airbag in the volume compensation device, when the viscous damper is under pressure, the airbag will be compressed. When the airbag moves in the compression direction, if its speed is required to remain consistent with the movement speed of the piston, the pressure acting on the fluid-solid interface needs to be greater and greater, and the damping output also needs to be greater and greater. On the contrary, when the viscous damper is pulled, the airbag will be released. When the airbag moves in the release direction, if its speed is required to be consistent with the movement speed of the piston, basically the negative pressure provided by the piston movement on the fluid-solid interface can ensure that the speeds of the two are consistent, which leads to inconsistent tension and compression outputs of the damper, thereby affecting the performance of the damper. Therefore, it is necessary to improve it. Utility Model Content

[0004] The purpose of the utility model is to provide a single-rod viscous damper in view of the defects and shortcomings of the prior art. The utility model has a simple and reasonable structure and is easy to operate. By reasonably setting the various dimensional parameters of the V-shaped channel and the Tesla valve, the tension and compression of the damper can be consistent. The Tesla valve and the accumulator have the functions of compensation and voltage stabilization, thereby ensuring the stable performance of the damper.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] The utility model discloses a single-rod viscous damper, comprising a cylinder, an upper end cover, a lower end cover, a piston and a piston rod. The upper end cover and the lower end cover are fixedly connected to the cylinder, the piston and the piston rod are arranged in the cylinder and divide the inner cavity of the cylinder into a rod cavity and a rodless cavity, the piston is fixedly connected to the piston rod, and a V-shaped channel connecting the rod cavity and the rodless cavity is provided on the piston. An accumulator and a Tesla valve are also provided outside the cylinder. The accumulator is connected to the lower end cover through a first pipeline, and the Tesla valve is respectively connected to the upper end cover and the lower end cover through a second pipeline. A first fluid channel connected to the rod cavity and the second pipeline is provided in the upper end cover, and a second fluid channel connected to the rodless cavity, the first pipeline and the second pipeline is provided in the lower end cover. The rodless cavity is connected to the accumulator through the first pipeline, and the rodless cavity is also connected to the rod cavity through the second pipeline via the Tesla valve.

[0007] Furthermore, the V-shaped channel is provided with a first flow channel hole connected to the rod chamber and a second flow channel hole connected to the rodless chamber, and the aperture of the first flow channel hole is smaller than the aperture of the second flow channel hole.

[0008] Furthermore, two V-shaped channels are provided and are symmetrically arranged along the center of the piston.

[0009] Furthermore, the Tesla valve is provided with a first inlet connected to the rod chamber and a second inlet connected to the rodless chamber, and the damping of the fluid flowing from the first inlet to the second inlet is smaller than the damping of the fluid flowing from the second inlet to the first inlet.

[0010] Furthermore, two Tesla valves are provided and are respectively located outside the two sides of the cylinder, and the second pipeline is arranged in a one-to-one correspondence with the Tesla valve.

[0011] Furthermore, both the rodless cavity and the rod cavity are filled with damping fluid.

[0012] Furthermore, the damping fluid is dimethyl silicone oil.

[0013] Furthermore, the upper end of the piston rod extends out of the upper end cover and is provided with a connecting piece.

[0014] Furthermore, a gap is formed between the upper end cover and the piston rod, and the rod cavity is connected with the first fluid channel through the gap.

[0015] Furthermore, a hole communicating with the rodless cavity and the second fluid channel is provided at the center of the lower end cover.

[0016] The beneficial effects of the utility model are as follows: the single-rod viscous damper described in the utility model, when the piston rod drives the piston to move downward, the pressure in the rodless chamber increases, and part of the damping fluid in the rodless chamber enters the rod chamber through the V-shaped channel, generating a viscous damping force, which plays a role in vibration reduction, and part of the damping fluid in the rodless chamber also enters the accumulator through the first pipeline, and causes the pressure in the accumulator chamber to increase, and the gas in the airbag is compressed, which plays a role in storing the damping fluid, and the piston rod is not prone to "sticking dead", and part of the damping fluid will enter the Tesla valve through the second pipeline and finally enter the rod chamber. At this time, the damping fluid flows from the second inlet of the Tesla valve to the first inlet, and this direction is the high-resistance direction of the fluid in the Tesla valve structure, and the damping generated is relatively large; when the piston rod drives the piston to move upward, the pressure in the rod chamber increases, and part of the damping fluid in the rod chamber enters the rodless chamber through the V-shaped channel, generating a viscous damping force, which plays a role in vibration reduction, The pressure in the rodless chamber decreases, and the pressure in the accumulator chamber decreases as well. The gas in the airbag expands, releasing the damping fluid, and replenishing the damping fluid to the rodless chamber. The external accumulator can avoid the mixing of the damping fluid and the compressible gas, thereby avoiding the generation of "cavitation" and "vacuum" phenomena, and compensates for the volume occupied by the piston rod in the cylinder when under pressure to adapt to changes in the system volume. Another part of the damping fluid will enter the Tesla valve through the second pipe and eventually enter the rodless chamber. At this time, the damping fluid flows from the first inlet to the second inlet of the Tesla valve. This direction is the low-resistance direction of the fluid in the Tesla valve structure, and the damping generated is small. The flow resistance in the two directions of the V-shaped channel and the Tesla valve is different. By reasonably setting the various dimensional parameters of the V-shaped channel and the Tesla valve, the tension and compression of the damper can be consistent. The Tesla valve and the accumulator have the functions of compensation and voltage stabilization, ensuring that the system will not have the phenomenon of excessive pressure, with high safety, and ensuring the stable performance of the damper. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 It is a schematic diagram of the cross-sectional structure of the utility model at a first viewing angle;

[0019] Figure 3 is a schematic diagram of the cross-sectional structure of the utility model at a second viewing angle;

[0020] Figure 4 It is a schematic diagram of the cross-sectional structure of the Tesla valve;

[0021] Figure 5 It is a schematic diagram of the cross-sectional structure of the connection between the upper end cover, the cylinder barrel and the second pipeline;

[0022] Figure 6 is a schematic diagram of the cross-sectional structure of the connection between the lower end cover, the cylinder barrel and the second pipeline;

[0023] Figure 7 It is a schematic diagram of the cross-sectional structure of the piston.

[0024] Figure 1-7 In: 1. Cylinder barrel; 2. Upper end cover; 3. Lower end cover; 4. Piston; 5. Piston rod; 6. Rod chamber; 7. Rodless chamber; 41. V-shaped channel; 8. Accumulator; 9. Tesla valve; 10. First pipeline; 11. Second pipeline; 21. First fluid channel; 31. Second fluid channel; 32. Orifice; 411. First flow channel hole; 412. Second flow channel hole; 91. First inlet; 92. Second inlet; 12. Connector; 13. Gap. DETAILED DESCRIPTION

[0025] The utility model is further described below in conjunction with the accompanying drawings.

[0026] like Figure 1-7 A single-rod viscous damper shown in the figure comprises a cylinder 1, an upper end cover 2, a lower end cover 3, a piston 4 and a piston rod 5. The upper end cover 2 and the lower end cover 3 are fixedly connected to the cylinder 1. The piston 4 and the piston rod 5 are arranged in the cylinder 1 and divide the inner cavity of the cylinder 1 into a rod cavity 6 and a rodless cavity 7. The piston 4 is fixedly connected to the piston rod 5. A V-shaped channel 41 is provided on the piston 4 to connect the rod cavity 6 and the rodless cavity 7. When the piston 4 moves, the damping fluid will pass through the V-shaped channel 41, thereby generating a viscous damping force to play a vibration reduction role. An accumulator 8 and a Tesla valve 9 are also provided outside the cylinder 1, which do not occupy the volume in the cylinder 1. The accumulator 8 is connected to the lower end cover 3 through a first pipeline 10, and the Tesla valve 9 is connected to the lower end cover 3 through a second pipeline 11. It is connected to the upper end cover 2 and the lower end cover 3. The upper end cover 2 is provided with a first fluid channel 21 connected with the rod chamber 6 and the second pipe 11. The lower end cover 3 is provided with a second fluid channel 31 connected with the rodless chamber 7, the first pipe 10 and the second pipe 11. The rodless chamber 7 is connected with the accumulator 8 through the first pipe 10. The rodless chamber 7 is also connected with the rod chamber 6 through the second pipe 11 via the Tesla valve 9, which is conducive to the recycling of the damping fluid. The accumulator 8 can provide additional damping fluid storage and release to achieve volume compensation, ensuring that the damper can operate normally under pressure and tension. The setting of the Tesla valve 9 can also increase the compensation performance. When the damping fluid passes through the Tesla valve 9, it will generate viscous damping force to play a vibration reduction role.

[0027] Specifically, the accumulator 8 includes a shell and an airbag. An inner cavity is formed inside the shell. The airbag is placed in the inner cavity. The compressibility of the airbag is used to store and release the damping fluid. When the piston rod 5 pushes the piston 4 downward, part of the damping fluid in the rodless chamber 7 enters the accumulator 8 through the first pipe 10. The piston rod 5 is not prone to being "stuck", and the pressure in the inner cavity of the accumulator 8 increases, and the gas in the airbag is compressed. When the pressure in the inner cavity decreases, the gas in the airbag expands, releasing the damping fluid, and replenishing the damping fluid to the rodless chamber 7. The external accumulator 8 can avoid the mixing of the damping fluid and the compressible gas, thereby avoiding the generation of "cavitation" and "vacuum" phenomena, and compensate for the volume occupied by the piston rod 5 in the cylinder 1 when under pressure to adapt to changes in the system volume.

[0028] Regarding the specific structure of the accumulator 8, reference may be made to a bladder accumulator disclosed in a Chinese patent application (publication number: CN114017399A) and a bladder accumulator disclosed in a Chinese patent application (publication number: CN106368991A). In view of the fact that the basic structure / principle of the accumulator 8 has been disclosed in detail in the prior art, it will not be described in detail in this embodiment.

[0029] Preferably, in this embodiment, refer to Figure 7 The V-shaped channel 41 is provided with a first flow channel hole 411 connected with the rod chamber 6 and a second flow channel hole 412 connected with the rodless chamber 7. The aperture of the first flow channel hole 411 is smaller than the aperture of the second flow channel hole 412. The aperture sizes of the first flow channel hole 411 and the second flow channel hole 412 are different, so that the tensile and compressive output forces are different. Reasonable setting of their sizes can achieve consistent tensile and compressive output forces of the single-rod viscous damper, making the performance of the damper more stable, thereby extending the service life of the damper.

[0030] Preferably, in this embodiment, two V-shaped channels 41 are provided and are symmetrically arranged along the center of the piston 4, which is beneficial to increase the contact area between the damping fluid and the surface of the piston 4, thereby improving the damping effect and playing a role in vibration reduction.

[0031] Preferably, in this embodiment, refer to Figure 4 The Tesla valve 9 is provided with a first inlet 91 connected to the rod chamber 6 and a second inlet 92 connected to the rodless chamber 7. The damping of the fluid flowing from the first inlet 91 to the second inlet 92 is less than the damping of the fluid flowing from the second inlet 92 to the first inlet 91. Since the flow resistance of the Tesla valve 9 in two directions is different, the tension and compression of the damper can be consistent by reasonably setting the various dimensional parameters of the Tesla valve 9.

[0032] Preferably, in this embodiment, two Tesla valves 9 are provided and are respectively located outside the two sides of the cylinder 1. The second pipeline 11 and the Tesla valve 9 are arranged in a one-to-one correspondence. The setting of two Tesla valves 9 can increase the compensation performance and improve the working efficiency. A single Tesla valve 9 may fail due to fatigue during long-term operation, thereby affecting the normal operation of the system. The setting of two Tesla valves 9 can solve this problem. When a single Tesla valve 9 fails, the other Tesla valve 9 can continue to work to ensure the normal operation of the system.

[0033] Regarding the specific structure of the Tesla valve 9, reference may be made to a speed-adjustable Tesla valve disclosed in a Chinese patent application (publication number: CN112197033A), and a one-way pipe, an internal combustion engine, and a damper disclosed in a Chinese patent application (publication number: CN218991754U). In view of the fact that the basic structure / principle of the Tesla valve 9 has been disclosed in detail in the prior art, it will not be described in detail in this embodiment.

[0034] Preferably, in this embodiment, the rodless cavity 7 and the rod cavity 6 are both filled with damping liquid. Preferably, the damping liquid is dimethyl silicone oil. Dimethyl silicone oil plays an important role in many fields with its unique physical and chemical properties, especially in the field of dampers. Dimethyl silicone oil exhibits excellent viscosity-temperature performance stability. Whether under high or low temperature conditions, the damping performance of dimethyl silicone oil can remain relatively stable, avoiding large fluctuations in damping performance caused by temperature fluctuations, thereby improving the service life and reliability of the damper; dimethyl silicone oil also has shear thinning properties and excellent compression resistance. Under the action of shear force, the viscosity of dimethyl silicone oil will decrease, which helps to improve the output efficiency of the damper, and under the action of compression force, the viscosity of dimethyl silicone oil will increase, which is conducive to enhancing the recovery resistance of the damper and maintaining the stability of its damping performance. At the same time, it also helps to improve the buffering capacity of the damper and reduce the impact of impact on the equipment.

[0035] Preferably, in this embodiment, the upper end of the piston rod 5 extends out of the upper end cover 2 and is provided with a connecting piece 12, which is connected to the external load through the connecting piece 12, so that the piston rod 5 can be effectively connected to the external load to ensure the stability and safety of the connection.

[0036] Preferably, in this embodiment, refer to Figure 5 A gap 13 is formed between the upper end cover 2 and the piston rod 5, and the rod cavity 6 is connected to the first fluid channel 21 through the gap 13; preferably, in this embodiment, refer to Figure 6 A hole 32 communicating with the rodless cavity 7 and the second fluid channel 31 is provided at the center of the lower end cover 3, thereby ensuring the flow circulation of the damping fluid.

[0037] The working principle of the utility model is as follows: when the piston rod 5 drives the piston 4 to move downward, the pressure in the rodless chamber 7 increases, and part of the damping fluid in the rodless chamber 7 enters the rod chamber 6 through the V-shaped channel 41, generating a viscous damping force, which plays a role in vibration reduction. Part of the damping fluid in the rodless chamber 7 also enters the accumulator 8 through the first pipe 10, and causes the pressure in the inner chamber of the accumulator 8 to increase, and the gas in the airbag is compressed, which plays a role in storing the damping fluid, and the piston rod 5 is not prone to "sticking". Another part of the damping fluid will enter the Tesla valve 9 through the second pipe 11 and finally enter the rod chamber 6. At this time, the damping fluid flows from the second inlet 92 of the Tesla valve 9 to the first inlet 91. This direction is the high-resistance direction of the fluid in the Tesla valve 9 structure, and the damping generated is relatively large; when the piston rod 5 drives the piston 4 to move upward, the pressure in the rod chamber 6 increases, and part of the damping fluid in the rod chamber 6 enters the rodless chamber 7 through the V-shaped channel 41, generating a viscous damping force, which plays a role in vibration reduction. The force is reduced, and the pressure in the inner cavity of the accumulator 8 is reduced. The gas in the airbag expands, releasing the damping fluid, and replenishing the damping fluid to the rodless cavity 7; the external accumulator 8 can avoid the mixing of the damping fluid and the compressible gas, thereby avoiding the generation of "cavitation" and "vacuum" phenomena, and compensates for the volume occupied by the piston rod 5 in the cylinder 1 when under pressure to adapt to the change in the system volume. Another part of the damping fluid will enter the Tesla valve 9 through the second pipe 11 and finally enter the rodless cavity 7. At this time, the damping fluid flows from the first inlet 91 of the Tesla valve 9 to the second inlet 92. This direction is the low-resistance direction of the fluid in the Tesla valve 9 structure, and the damping generated is small. The flow resistance in the two directions of the V-shaped channel 41 and the Tesla valve 9 is different. By reasonably setting the various dimensional parameters of the V-shaped channel 41 and the Tesla valve 9, the tension and compression of the damper can be consistent. The Tesla valve 9 and the accumulator 8 have the functions of compensation and voltage stabilization, ensuring that the system will not have the phenomenon of excessive pressure, with high safety, and ensuring the stable performance of the damper.

[0038] The above description is only a preferred embodiment of the present utility model, so all equivalent changes or modifications made according to the structure, features and principles described in the scope of the present utility model patent application are included in the scope of the present utility model patent application.

Claims

1. A single-rod viscous damper, comprising a cylinder (1), an upper end cover (2), a lower end cover (3), a piston (4) and a piston rod (5), wherein the upper end cover (2) and the lower end cover (3) are fixedly connected to the cylinder (1), the piston (4) and the piston rod (5) are arranged in the cylinder (1) and divide the inner cavity of the cylinder (1) into a rod cavity (6) and a rodless cavity (7), and the piston (4) and the piston rod (5) are fixedly connected, characterized in that: The piston (4) is provided with a V-shaped channel (41) connecting the rod chamber (6) and the rodless chamber (7). An accumulator (8) and a Tesla valve (9) are also provided outside the cylinder (1). The accumulator (8) is connected to the lower end cover (3) via a first pipe (10). The Tesla valve (9) is connected to the upper end cover (2) and the lower end cover (3) via a second pipe (11). The upper end cover (2) is provided with a first fluid channel (21) connected to the rod chamber (6) and the second pipe (11). The lower end cover (3) is provided with a second fluid channel (31) connected to the rodless chamber (7), the first pipe (10) and the second pipe (11). The rodless chamber (7) is connected to the accumulator (8) via the first pipe (10). The rodless chamber (7) is also connected to the rod chamber (6) via the second pipe (11) via the Tesla valve (9).

2. A single-rod viscous damper according to claim 1, characterized in that: The V-shaped channel (41) is provided with a first flow channel hole (411) connected to the rod chamber (6) and a second flow channel hole (412) connected to the rodless chamber (7); the aperture of the first flow channel hole (411) is smaller than the aperture of the second flow channel hole (412).

3. The single-rod viscous damper according to claim 2, characterized in that: Two V-shaped channels (41) are provided and are symmetrically arranged along the center of the piston (4).

4. The single-rod viscous damper according to claim 1, characterized in that: The Tesla valve (9) is provided with a first inlet (91) connected to the rod chamber (6) and a second inlet (92) connected to the rodless chamber (7), and the damping of the fluid flowing from the first inlet (91) to the second inlet (92) is smaller than the damping of the fluid flowing from the second inlet (92) to the first inlet (91).

5. The single-rod viscous damper according to claim 4, characterized in that: Two Tesla valves (9) are provided and are respectively located outside the two sides of the cylinder (1), and the second pipeline (11) and the Tesla valve (9) are arranged in a one-to-one correspondence.

6. The single-rod viscous damper according to claim 1, characterized in that: The rodless cavity (7) and the rod cavity (6) are both filled with damping fluid.

7. The single-rod viscous damper according to claim 6, characterized in that: The damping fluid is dimethyl silicone oil.

8. The single-rod viscous damper according to claim 1, characterized in that: The upper end of the piston rod (5) protrudes from the upper end cover (2) and is provided with a connecting piece (12).

9. The single-rod viscous damper according to claim 1, characterized in that: A gap (13) is formed between the upper end cover (2) and the piston rod (5), and the rod chamber (6) is connected to the first fluid channel (21) through the gap (13).

10. The single-rod viscous damper according to claim 1, characterized in that: A hole (32) communicating with the rodless cavity (7) and the second fluid channel (31) is provided at the center of the lower end cover (3).

Images