Single-out-rod viscous damper with additional limiting sliding block device

Abstract

The novel single-out-rod viscous damper with additional limiting sliding block device disclosed by the application comprises a main cylinder body, an air bag accumulator, a piston rod, a piston and a limiting sliding block device. A reserved communication hole is arranged on the front cover plate of the main cylinder body; the inner side of the rear cover plate is connected with the air bag accumulator, and the outer side is connected with a connecting piece; an annular limiter is arranged at the rear cover plate; the piston is connected with one end of the piston rod, and the piston is provided with a rectangular damping hole and the limiting sliding block device; the side surface of the limiting sliding block device is provided with a pipeline in communication with the atmosphere, and the bottom surface is provided with a movable sliding block; the movable sliding block is connected with the top surface of the limiting sliding block device through a steel cable and a spring; and a limiter is arranged between the movable sliding block and the top surface of the limiting sliding block device. The damper solves the volume compensation problem through the air bag accumulator and solves the inconsistent pull and pressure output problem through the limiting sliding block device on the piston, so that the damper can stably consume energy and output when in service.

Description

Technical Field

[0001] This invention belongs to the field of vibration control, and more specifically, relates to a single-rod viscous damper with an additional limiting slider device. Background Technology

[0002] In current engineering applications, single-output rod viscous dampers present two significant problems. First, the inconsistent working area of ​​the single-output rod viscous damper leads to malfunctions and operation, resulting in "vacuum" and "lock-in" phenomena. Second, to address these issues, a volume compensation device is required. However, this device affects the output and energy dissipation of the single-output rod viscous damper. When the damper is under compression, the output gradually increases with the compression of the accumulator, enhancing energy dissipation. Conversely, when the damper is under tension, the output gradually decreases with the release of the accumulator, reducing energy dissipation. Therefore, the introduction of a volume compensation device results in inconsistent tensile and compressive outputs, which is the fundamental reason for the unstable output and energy dissipation of single-output rod viscous dampers during operation.

[0003] In order to solve the construction problem of single-outlet viscous dampers without excessively increasing their size, many patents at home and abroad have various technical solutions. For example, patent number CN 106641084 B discloses a single-outlet damper with an elastic compensation chamber that can provide appropriate compensation stiffness and ultimately achieve shock and vibration reduction. However, the main cylinder of this device is too long and does not consider the impact of the introduction of the volume compensation device on the output performance of the damper. Summary of the Invention

[0004] The novel objective of this invention is to provide a single-rod viscous damper with an additional limiting slider device, in order to solve the problems mentioned in the background art, such as the current traditional single-rod viscous damper being not only bulky and not considering the influence of the introduction of a volume compensation device on the damper, but also having unstable tensile and compressive output and unstable energy dissipation capacity.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a single-rod viscous damper with an additional limiting slider device, comprising a main cylinder, an air accumulator, a piston rod, a piston, and a limiting slider device. Preferably, a connecting hole is provided in the front cover plate of the main cylinder, the inner side of the rear cover plate of the main cylinder is connected to the air accumulator, and the outer side is fixedly connected to the connecting member 2. An annular limiting device is provided near the rear cover plate. One end of the piston rod is on the outer side of the main cylinder and fixedly connected to the connecting member 1, and the other end extends into the rod cavity in the main cylinder through the connecting hole and is fixedly connected to the piston. A rectangular damping hole is provided on the piston, and a limiting slider device is installed in the rectangular damping hole. The limiting slider device has a ventilation pipe communicating with the atmosphere, a movable slider, a limiting device, a steel cable, and a spring.

[0006] Preferably, the main cylinder body is connected to the front cover plate, the annular limiter, and the rear cover plate by welding.

[0007] Preferably, the radius of the piston is equal to the radius of the main cylinder; the piston divides the main cylinder into two parts: a rod chamber and a rodless chamber; the piston has several elongated rectangular damping holes and a limiting slider device.

[0008] Preferably, a limiting slider device is installed in the middle of each rectangular damping hole, and a ventilation pipe communicating with the atmosphere is provided on the side of the limiting slider device. A movable slider is installed on the bottom surface of the limiting slider device, and the movable slider is connected to the top surface of the limiting slider device by a steel cable and a spring. A limiter is provided between the movable slider and the top surface of the limiting slider device.

[0009] Compared with the prior art, the novel beneficial effects of this invention are: This single-outlet rod viscous damper: (1) A pneumatic accumulator was adopted. The pneumatic accumulator is used to solve the "vacuum" and "blockage" phenomena that occur in the operation of the single-outlet viscous damper. While ensuring the stable output and energy consumption of the viscous damper, it also has the advantages of being more compact and easier to seal compared to other volume compensation methods.

[0010] (2) Install a limiting slider device in the rectangular damping hole on the piston. When the damper is under pressure, the viscous medium will flow into the damping channel and exert an impact force on the slider. The impact force acting on the inclined plane is perpendicular to the inclined plane. The force perpendicular to the inclined plane can be decomposed into two forces: a horizontal force and a vertical force. The vertical force can counteract the preload provided by the spring, causing the slider to move upward until the slider is blocked by the limiter in the slide. At this time, the area that actually works in the damping channel will be larger than the reserved area, which leads to a reduction in damping force. When the damper is under tension, viscous medium flows into the damping channel. This viscous medium exerts an impact force on the slider. However, since this impact force acts on a vertical surface, it does not directly affect the slider's motion. Furthermore, as the viscous medium flows across the slider, a negative pressure perpendicular to the slope is generated. This negative pressure can be decomposed, revealing a downward force on the slider. This downward force causes the slider to tend to move downwards, but due to the presence of the steel cable, the slider remains fixed in one position and does not move downwards. In this case, the damping force is unaffected. Therefore, the damper achieves equal tension and compression output, ensuring smooth operation and stable energy dissipation during operation. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the present invention.

[0012] Figure 2 This describes the installation of the limiting slider device of the present invention.

[0013] Figure 3 This describes the movement of the limiting slider device under tension according to the present invention.

[0014] Figure 4 This describes the movement of the limiting slider device under pressure according to the present invention.

[0015] In the diagram, 1-Connector 1; 2-Ventilation pipe; 3-Piston rod; 4-Front end cover; 5-Main cylinder body; 6-Rectangular damping hole; 7-Annular limiter; 8-Airbag accumulator; 9-Rear end cover; 10-Connector 2; 11-Rodless chamber; 12-Piston; 13-Limiting slider device; 14-Rod chamber; 15-Connecting hole; 16-Limiter; 17-Steel cable 1; 18-Spring; 19-Modible slider; 20-Steel cable 2. Detailed Implementation

[0016] The technical solutions of the novel embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the novel invention, and not all embodiments. Based on the embodiments of the novel invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the novel invention.

[0017] Please see Figure 1-4 This invention provides a novel single-rod viscous damper with an additional limiting slider device, comprising a main cylinder 5, an air accumulator 8, a piston rod 3, a piston 12, and a limiting slider device 13. The main cylinder 5 has a pre-drilled connecting hole 15 in its front cover plate 4; the inner side of the rear cover plate 9 of the main cylinder 5 is connected to the air accumulator 8, and the outer side is fixedly connected to a connecting piece 10; an annular limiting device 7 is provided near the rear cover plate 9; one end of the piston rod 3 is on the outer side of the main cylinder 5 and fixedly connected to a connecting piece 1, while the other end extends into the main cylinder 5 through the connecting hole 15 and is fixedly connected to the piston 12; the piston 12 has a rectangular damping hole 6, in which the limiting slider device 13 is installed. The limiting slider device 13 includes a ventilation pipe 2 communicating with the atmosphere, a movable slider 19, a limiting device 16, a steel cable 17, a steel cable 20, and a spring 18; the main cylinder 5 is filled with a viscous medium.

[0018] When the external structure connected to connector 1 moves, the external load is transmitted to piston rod 3 through connector 1 and further to piston 12. Piston 12 reciprocates according to the load direction: when the damper is compressed, the viscous medium is squeezed from rodless cavity 11 into rectangular damping hole 6 on piston 12; when the damper is stretched, the viscous medium flows from rod cavity 14 into rectangular damping hole 6 on piston 12; when the viscous medium enters and exits the rectangular damping hole 6, it generates damping force and dissipates energy due to throttling effect.

[0019] The function of the annular limiter 7 is to prevent the piston 12 from contacting the accumulator 8 when it moves.

[0020] When the damper is compressed, more of the piston rod 3 enters the main cylinder 5. At this time, the internal pressure in the main cylinder 5 increases. Since the bulk modulus of viscous media is generally large, the viscous media is not compressed. The pressure is transmitted to the contact surface between the air accumulator 8 and the viscous media, thereby squeezing the highly compressible gas in the air accumulator 8 to ensure that the pressure of the viscous media in the main cylinder 5 is constant and to play a role in volume compensation. When the damper is stretched, more of the piston rod retracts from the main cylinder 5. At this time, the compressed gas in the air accumulator 8 gradually expands to ensure that a "vacuum" does not appear in the main cylinder 5, thus ensuring the normal operation of the damper.

[0021] Each rectangular damping hole 6 has a limiting slider device 13 installed in the middle. The side of the limiting slider device 13 is provided with a ventilation pipe 2 that communicates with the atmosphere. The function of the ventilation pipe 2 is to prevent the air in the limiting slider device 13 from forming a gas spring under sealed conditions, which would prevent the movable slider 19 from moving normally.

[0022] A movable slider 19 is mounted on the bottom surface of the limiting slider device 13. The movable slider 19 and the groove of the limiting slider device 13 are engaged, allowing it to move up and down. The movable slider 19 is connected to the top surface of the limiting slider device 13 via steel cable 17, steel cable 20 and spring 18. The steel cables 17 and 20 limit the maximum downward movement distance of the movable slider 19. The spring 18 provides a downward force to the movable slider 19, which must be greater than the weight of the movable slider 19. A limiter 16 is provided between the movable slider 19 and the top surface of the limiting slider device 13. The limiter 16 limits the maximum upward movement distance of the movable slider 19.

[0023] When the damper is compressed, the viscous medium flows into the rectangular damping hole 6. The viscous medium exerts an impact force on the movable slider 19. The impact force acting on the inclined plane is perpendicular to the inclined plane. The force perpendicular to the inclined plane can be decomposed into two forces: a horizontal force and a vertical force. The vertical force can counteract the preload provided by the spring 18, causing the movable slider 19 to move upward until the movable slider 19 is stopped by the limiter 16 in the slide. At this time, the actual effective area in the rectangular damping hole 6 will be larger than the reserved area, which can lead to a reduction in the output force under pressure.

[0024] When the damper is under tension, the viscous medium flows into the rectangular damping hole 6. This viscous medium exerts an impact force on the movable slider 19. However, since this impact force acts on a vertical surface, it does not directly affect the motion of the movable slider 19. Furthermore, when the viscous medium flows across the inclined surface of the movable slider 19, a negative pressure perpendicular to the inclined surface is generated. This negative pressure can be decomposed, revealing a downward force on the movable slider 19. This downward force causes the movable slider 19 to tend to move downwards. However, due to the presence of steel cables 17 and 20, the movable slider 19 is fixed in one position and does not move downwards. In this case, the area actually functioning in the rectangular damping hole 6 is consistent with the reserved area, and the tensile force is unaffected. Therefore, the equal tensile and compressive forces of the damper are achieved, ensuring smooth operation and stable energy dissipation during operation.

[0025] Working principle

[0026] refer to Figure 3 When the damper is under tension, the piston 12 of the main cylinder 5 moves to the left. The viscous medium in the rod chamber 14 flows through the rectangular damping hole 6 to the rodless chamber 11. The movable slider 19 in the limiting slider device 13 installed on the piston 12 is attracted by the fluid and moves downward until it is fixed by the steel cable 17 and the steel cable 20. The output force of the damper remains unchanged. Part of the piston rod 3 exits the main cylinder 5. The pressure of the viscous medium in the main cylinder 5 decreases, causing the compressed gas in the air bag 7 to be released, providing power for the replenishment of the viscous medium and ensuring the normal operation of the damper.

[0027] refer to Figure 4 When the damper is compressed, the piston 12 of the main cylinder 5 moves to the right, and the viscous medium in the rodless chamber 11 flows to the rod chamber 14 through the rectangular damping hole 6. The movable slider 19 in the limiting slider device 13 installed on the piston 12 is pushed up by the fluid until it is fixed by the limiter 16, and the output force of the damper decreases. More of the piston rod 3 enters the main cylinder 5, the pressure of the viscous medium in the main cylinder 5 increases and squeezes the compressible gas in the air bladder accumulator 8, providing volume compensation for the viscous medium and ensuring the normal operation of the damper.

[0028] When the damper is running, its output force formula is: F D =F0+k(dv / V). Where: F D F0 is the output power of the damper, and F0 is the energy dissipation output power of the damper. k Let dv be the bulk modulus of the gas in the airbag accumulator 8, dv be the compressibility of the accumulator at any given time, and V be the total volume of the gas in the airbag accumulator 8. When the damper is compressed, the airbag accumulator 8 will be compressed, and the dv value will gradually increase. According to its output formula, as the dv value increases, the compressive output force of the damper will also increase. When the damper is stretched, the airbag accumulator 8 will be released, and the dv value will gradually decrease. According to its output formula, as the dv value decreases, the tensile output force of the damper will also decrease. Therefore, the compressive output force is greater than the tensile output force.

[0029] Since the energy dissipation output F0 of the damper is inversely proportional to the effective working area of ​​the rectangular damping orifice, when the damper is under pressure, the movable slider 19 in the limiting slider device 13 installed on the piston 12 is pushed up by the fluid until it is fixed by the limiter 16. This causes the effective working area of ​​the rectangular damping orifice 6 to increase, thereby reducing the output under pressure. When the damper is under tension, the movable slider 19 in the limiting slider device 13 installed on the piston 12 is attracted by the fluid until it is fixed by the steel cable 17 and the steel cable 20. This causes the effective working area of ​​the rectangular damping orifice 6 to remain unchanged, and the output under tension to remain basically unchanged, thus making the final output of the damper equal. Therefore, selecting a movable slider 19 of appropriate size, a steel cable 17 and a steel cable 20 of appropriate length, and a limiter 16 of appropriate position can counteract the process of the damper output increasing, so that the damper can achieve equal output under tension and compression, and achieve stable energy dissipation and output in practical applications.

[0030] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A single-rod viscous damper with an additional limiting slider device, comprising a main cylinder (5), an air accumulator (8), a piston rod (3), a piston (12), and a limiting slider device (13), characterized in that: A connecting hole (15) is reserved in the front cover plate (4) of the main cylinder (5). The inner side of the rear cover plate (9) of the main cylinder (5) is connected to the airbag accumulator (8), and the outer side is fixedly connected to the second connector (10). An annular limiter (7) is provided near the rear cover plate (9) to prevent the piston (12) from contacting the airbag accumulator (8). One end of the piston rod (3) is located outside the main cylinder (5) and fixedly connected to the first connector (1). The other end extends into the main cylinder (5) through the connecting hole (15) and is fixedly connected to the piston (12). The piston (12) The main cylinder (5) is divided into a rod chamber (14) and a rodless chamber (11); the piston (12) is provided with a rectangular damping hole (6) connecting the rod chamber (14) and the rodless chamber (11), and the limiting slider device (13) is installed in the middle of the rectangular damping hole (6); the side of the limiting slider device (13) is provided with a ventilation pipe (2) communicating with the atmosphere; the limiting slider device (13) includes a limiter (16), a steel cable one (17), a steel cable two (20), a spring (18), a movable slider (19) and a groove; the movable slider (19) can move up and down. The movable slider (19) is located within the groove and is connected to the top surface of the groove via steel cable one (17), steel cable two (20), and spring (18). The groove is equipped with a limiter (16). The movable slider (19) is a wedge-shaped block, with one end connected to steel cable one (17), steel cable two (20), and spring (18), and the other end extending into the rectangular damping hole. This end is provided with an inclined surface and a vertical surface. The flow direction of the inclined surface and the vertical surface relative to the rectangular damping hole (6) is set as follows: when the damper is compressed, the viscous medium flows from the rodless cavity (11) through the rectangular damping hole (6) to the rodless cavity (11). In the rod cavity (14), the viscous medium acts on the inclined plane and overcomes the preload of the spring (18), causing the movable slider (19) to move upward until it is limited by the limiter (16), thereby increasing the effective working area of ​​the rectangular damping hole (6) and reducing the pressure output. When the damper is under tension, the viscous medium flows from the rod cavity (14) through the rectangular damping hole (6) to the rodless cavity (11). The downward movement of the movable slider (19) is limited by the first steel cable (17) and the second steel cable (20), so that the effective working area of ​​the rectangular damping hole (6) remains unchanged.

2. The single-outlet viscous damper according to claim 1, characterized in that: The ventilation pipe (2) is used to connect the inside of the limiting slider device (13) with the atmosphere to prevent the air from forming a gas spring; the spring (18) applies a downward preload to the movable slider (19), and the preload is greater than the weight of the movable slider (19); the first steel cable (17) and the second steel cable (20) limit the maximum downward movement distance of the movable slider (19), and the limiter (16) limits the maximum upward movement distance of the movable slider (19).

3. The single-outlet viscous damper according to claim 1, characterized in that: When the damper is compressed, the air accumulator (8) is compressed to compensate for the increased volume caused by the piston rod (3) entering the main cylinder (5); when the damper is stretched, the air accumulator (8) expands to compensate for the reduced volume caused by the piston rod (3) exiting the main cylinder (5) and to prevent a vacuum from appearing in the main cylinder (5).

4. The single-outlet viscous damper according to claim 1, characterized in that: The dimensions of the movable slider (19), the lengths of the first steel cable (17) and the second steel cable (20), and the position of the limiter (16) are set such that the reduction in damping force corresponding to the increase in the effective working area of ​​the rectangular damping hole (6) caused by the movable slider (19) under pressure conditions compensates for the additional output force generated when the airbag accumulator (8) is compressed, so that the pressure output force and the tension output force of the damper tend to be consistent.

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