Damping device and hydraulic system

Abstract

The invention provides a damping device and a hydraulic system. The vibration damping device comprises a cylinder, an inner cavity of the cylinder is filled with damping liquid, and a via hole communicated with the inner cavity is formed in the first axial end of the cylinder; the piston mechanism comprises a piston plate and a piston rod, the piston plate is arranged in the inner cavity and connected to the inner circumferential wall of the barrel in a sealed and sliding mode, a channel penetrating through the two sides is formed in the piston plate in the thickness direction so that damping liquid can flow, the first end of the piston rod is connected with the piston plate, and the second end of the piston rod extends out of the barrel to support equipment to be damped; the elastic reset piece is arranged in an inner cavity of the cylinder body; the damping mechanism comprises a penetrating piece extending in the axial direction of the cylinder body, and the penetrating piece corresponds to the channel in the piston plate; according to the damping device provided by the invention, vibration energy can be converted into energy in other forms by arranging the piston mechanism, damping of the damping device can be regularly adjusted by arranging the channel in the piston mechanism and the insertion piece in the damping mechanism, the operation is simple, and the adjusting efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of vibration reduction technology, and more particularly to a vibration reduction device and hydraulic system. Background Technology

[0002] Vibration is generated during the operation of equipment to be vibration-damped (such as oil pumps). This vibration not only affects the required precision of the equipment, but may also cause problems such as loosening of multiple connections, fatigue damage of components, and in severe cases, even threaten the overall operational safety of the unit. Therefore, suppressing the vibration of the equipment to be vibration-damped is of paramount importance. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention provides a vibration damping device and a hydraulic system, wherein the vibration damping device can effectively suppress the vibration of the equipment to be damped.

[0004] Firstly, in order to achieve the above objectives, this application provides a vibration damping device, comprising: The cylinder has an inner cavity filled with damping fluid, and the first end of the cylinder in the axial direction has a through hole that connects to the inner cavity. The piston mechanism includes a piston plate and a piston rod. The piston plate is located in the inner cavity and is slidably connected to the inner circumferential wall of the cylinder. The piston plate has a channel that runs through both sides along the thickness direction to allow the damping fluid to flow. The piston rod is slidably inserted through the through hole along the axial direction of the cylinder. The first end of the piston rod is connected to the piston plate, and the second end extends out of the cylinder to support the device to be damped. An elastic reset member is disposed within the inner cavity of the cylinder; the first end of the elastic reset member is connected to the side of the piston plate opposite to the piston rod, and the second end is connected to the inner wall of the cylinder; and A damping mechanism is provided in the inner cavity of the cylinder and located on the side of the piston plate opposite to the piston rod. The damping mechanism includes a through-plug extending along the axial direction of the cylinder, and the through-plug corresponds to a channel on the piston plate. When the piston rod is subjected to an external force, causing the piston plate to move towards the second end of the cylinder in the axial direction, the insert is inserted into the channel to reduce the flow area of ​​the channel, and the piston plate squeezes the elastic reset member; when the piston rod is not subjected to an external force, the elastic reset member restores its deformation and pushes the piston plate and piston rod towards the second end of the cylinder in the axial direction away from the cylinder.

[0005] In one possible embodiment, the damping mechanism includes a first mounting rod and a second mounting rod. The first mounting rod is fixedly disposed inside the cylinder, and the second mounting rod is connected to the first mounting rod and extends radially along the cylinder. The through-hole consists of a plurality of inserts disposed on the second mounting rod, each insert extending axially along the cylinder. The channel includes a plurality of through holes corresponding one-to-one with the plurality of inserts. The diameter of each through hole is greater than or equal to the maximum radial dimension of the corresponding insert. The connection between the second mounting rod and the first mounting rod is located between the two ends of the second mounting rod. Multiple insert rods are distributed on both sides of the first mounting rod, and at least two insert rods are provided on each side of the first mounting rod. The height of all insert rods on the same side of the first mounting rod increases or decreases in steps from the direction closer to the first mounting rod to the direction farther away from the first mounting rod, and / or, the end of each insert rod near the piston plate is a conical structure.

[0006] In one possible embodiment, the damping mechanism further includes a connecting device and a pair of first limiting members spaced apart. One end of the first limiting member is connected to the side of the piston plate opposite to the piston rod, and the other end of the first limiting member extends axially away from the piston plate along the cylinder. A first mounting rod is disposed between the pair of first limiting members and extends axially along the cylinder. The outer wall of the first mounting rod is provided with external threads. The connecting device is sleeved on the outside of the first mounting rod and threadedly connected to the first mounting rod. A second mounting rod is installed on the connecting device. Among them, a pair of first limiting members are located on opposite sides of the connecting device to restrict the connecting device from rotating around the first mounting rod. The first mounting rod is rotatably disposed in the cylinder, and the end of the first mounting rod away from the piston plate extends out of the cylinder. The first mounting rod is configured to be rotatable to drive the connecting device to move axially along the cylinder.

[0007] In one possible embodiment, the damping mechanism further includes a pair of second limiting members spaced apart, one end of the second limiting member being fixed to the inner wall of the cylinder, and the other end of the second limiting member extending axially toward the piston plate along the cylinder. Among them, a pair of second limiting members correspond one-to-one with a pair of first limiting members, and each second limiting member slides in conjunction with the corresponding first limiting member.

[0008] In one possible embodiment, the vibration damping device further includes a rotating device and a mounting base; the mounting base is fixedly connected to the second end of the cylinder in the axial direction, the mounting base has an accommodating space, and the rotating device is located inside the accommodating space. The end of the first mounting rod away from the piston plate passes through the second end of the cylinder in the axial direction and the mounting base and is connected to the rotating device. The rotating device is used to drive the first mounting rod to rotate so as to adjust the height of the second mounting rod in the axial direction of the cylinder.

[0009] In one possible embodiment, the piston plate is provided with a one-way return flow structure, which includes an oil return hole and a cover plate. The oil return hole is a channel that runs through both sides of the piston plate. The cover plate is located on the side of the piston plate opposite to the piston rod and is rotatably connected to the piston plate. The cover plate covers the oil return hole. The opening and closing of the cover plate is affected by the flow direction of the damping fluid. When the piston plate moves toward the second end of the cylinder in the axial direction away from the cylinder, the cover plate opens to allow the damping fluid to pass through, allowing the damping fluid on the side of the piston plate connected to the piston rod to flow to the other side of the piston plate, accelerating the piston plate to reset under the action of the elastic reset member; when the piston plate moves toward the second end of the cylinder in the axial direction closes, the cover plate closes to prevent the damping fluid from passing through.

[0010] In one possible embodiment, the elastic reset member includes a spring member, and the number of spring members is one or more, with the spring members disposed around the damping mechanism. If there is only one spring component, it is fitted around the damping mechanism; if there are multiple spring components, they are arranged symmetrically around the damping mechanism.

[0011] In one possible embodiment, the piston mechanism further includes a support seat connected to the second end of the piston rod. The support seat is used to connect the device to be damped, and the axial position of the support seat relative to the piston rod is adjustable to adapt to the position of the device to be damped.

[0012] In one possible embodiment, the piston mechanism further includes an adjusting support rod and a locking structure. The locking structure is located at the second end of the piston rod. One end of the adjusting support rod is fixed to the support seat. An installation channel is formed at the end of the second end of the piston rod along the axial direction of the piston rod. The adjusting support rod is slidably inserted into the installation channel. The locking structure is used to fix the adjusting support rod to fix the height of the support seat in the axial direction of the piston rod.

[0013] In a second aspect, this application provides a hydraulic system comprising: an oil pump, an electric motor, and a vibration damping device as described in any of the first aspects; the oil pump is connected to the electric motor, and the second end of the piston rod in the vibration damping device is used to support the oil pump to reduce the vibration of the oil pump.

[0014] Compared with the prior art, the present invention has the following advantages: In the vibration damping device provided in this application, when the piston rod drives the piston plate to move under the vibration force of the device to be damped, the piston plate and the inner wall of the cylinder will generate friction, thereby consuming a portion of the vibration energy; furthermore, the elastic reset member squeezed by the piston plate undergoes elastic deformation, which not only plays a role in buffering and damping vibration, but also consumes a portion of the vibration energy; in addition, during the process of the piston plate squeezing the elastic reset member, the damping fluid located on the side of the piston plate opposite to the piston rod will flow to the other side of the piston plate through the channel on the piston plate. Due to the throttling effect of the channel, a certain damping force will be generated during the flow, which can further consume vibration energy. Therefore, the vibration damping device provided in this application can consume the vibration energy of the device to be damped in multiple ways, thereby effectively suppressing the vibration of the device to be damped.

[0015] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the background art, the accompanying drawings used in the embodiments of the present invention or the background art will be described below.

[0017] Figure 1 This is a three-dimensional schematic diagram of the overall structure of a vibration damping device provided in an embodiment of this application; Figure 2 This is a cross-sectional view of a vibration damping device provided in an embodiment of this application; Figure 3 This is a partial three-dimensional structural schematic diagram of a vibration damping device provided in an embodiment of this application; Figure 4 This is one of the embodiments provided in this application. Figure 3 Schematic diagram of part A in the middle; Figure 5 This is a partial front view of a vibration damping device according to an embodiment of this application; Figure 6 This is one of the embodiments proposed in this application. Figure 5 Schematic diagram of Part B; Figure 7 This is a schematic diagram of a hydraulic system for a turbine governor proposed in an embodiment of this application.

[0018] Explanation of key figure labels: 1000-Hydraulic system; 100-Vibration damping device; 10-Cylinder; 11-Through hole; 12-Mounting plate; 13-Oil change port; 14-Inner cavity; 20-Piston mechanism; 21-Piston plate; 211-Oil return hole; 212-Cover plate; 22-Piston rod; 23-Channel; 24-Support seat; 25-Adjusting support rod; 26-Locking structure; 27-Installation channel; 30-Elastic reset component; 40-Damping mechanism; 41-Through insert; 411-Insertion rod; 42-First mounting rod; 43-Second mounting rod; 44-Connecting device; 441-Moving block; 442-Connecting block; 45-First limiting component; 46-Second limiting component; 50-Rotating device; 60-Mounting base; 70-Equipment to be damped; 71-Oil pump; 711-Oil outlet pipe; 712-Oil inlet pipe; 72-Motor. Detailed Implementation

[0019] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0020] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0021] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0022] Please see Figure 1 and Figure 2 This application provides a vibration damping device 100, which includes a cylinder 10, a piston mechanism 20, an elastic reset member 30, and a damping mechanism 40. The inner cavity 14 of the cylinder 10 is filled with damping fluid, and the cylinder 10 has a first axial end (e.g., at the first end of the cylinder 10). Figure 2 The top of the cylinder 10 (as shown) has a through hole 11 connecting to the inner cavity 14; the piston mechanism 20 includes a piston plate 21 and a piston rod 22. The piston plate 21 is disposed in the inner cavity 14 and is slidably connected to the inner circumferential wall of the cylinder 10. The piston plate 21 also has a channel 23 through both sides along the thickness direction for the flow of damping fluid. The piston rod 22 is slidably inserted through the through hole 11 along the axial direction of the cylinder 10, and the first end of the piston rod 22 is connected to the piston plate 21, and the second end of the piston rod 22 extends out of the cylinder 10. Supports the device to be vibration damped; an elastic reset member 30 is disposed in the inner cavity 14 of the cylinder 10, and the first end of the elastic reset member 30 is connected to the side of the piston plate 21 opposite to the piston rod 22, and the second end of the elastic reset member 30 is connected to the inner wall of the cylinder 10; a damping mechanism 40 is disposed in the inner cavity 14 of the cylinder 10 and located on the side of the piston plate 21 opposite to the piston rod 22, and the damping mechanism 40 includes a through-plug 41 extending along the axial direction of the cylinder 10, and the through-plug 41 corresponds to the channel 23 on the piston plate 21.

[0023] When the piston rod 22 is subjected to an external force, it drives the piston plate 21 toward the second end of the cylinder 10 in the axial direction (e.g., Figure 2When the bottom end shown moves, the insert 41 is inserted into the channel 23 to reduce the flow area of ​​the channel 23, and the piston plate 21 squeezes the elastic reset member 30; when the piston rod 22 is not subjected to external force, the elastic reset member 30 restores its deformation and pushes the piston plate 21 and the piston rod 22 to move axially away from the second end of the cylinder 10.

[0024] The damping fluid is a fluid medium used in damping devices to consume vibration energy and slow down motion. Examples include commonly used damping fluids such as silicone oil, mineral oil / hydraulic oil, and polymer solutions. No limitation is made here, but hydraulic oil is preferred in this embodiment.

[0025] It is understood that in the vibration damping device 100 provided in the embodiments of this application, when the piston rod 22 drives the piston plate 21 to move under the vibration force of the device to be damped, the piston plate 21 and the inner wall of the cylinder 10 will generate friction, thereby consuming a portion of the vibration energy. Furthermore, the elastic reset member 30, which is squeezed by the piston plate 21, undergoes elastic deformation, which not only plays a role in buffering and damping but also consumes a portion of the vibration energy. In addition, during the process of the piston plate 21 squeezing the elastic reset member 30, the damping fluid on the side of the piston plate 21 facing away from the piston rod 22 will flow to the other side of the piston plate 21 through the channel 23 on the piston plate 21. Due to the throttling effect of the channel 23, a certain damping force will be generated during the flow, which can further consume the vibration energy. Therefore, the vibration damping device 100 provided in the embodiments of this application can consume the vibration energy of the device to be damped in multiple ways, thereby effectively suppressing the vibration of the device to be damped.

[0026] It should be noted that the vibration damping device 100 provided in the embodiments of this application also includes other components. The vibration damping device 100 provided in the embodiments of this application will be described in further detail below.

[0027] In one possible embodiment, please refer to Figure 3 and Figure 4The damping mechanism 40 includes a first mounting rod 42 and a second mounting rod 43. The first mounting rod 42 is fixedly disposed inside the cylinder 10, and the second mounting rod 43 is connected to the first mounting rod 42 and extends radially along the cylinder 10. The through-plug 41 consists of multiple inserts 411 disposed on the second mounting rod 43, each insert 411 extending axially along the cylinder 10. The channel 23 includes multiple through holes corresponding one-to-one with the multiple inserts 411. The diameter of each through hole is greater than or equal to the maximum radial diameter of the corresponding insert 411. The connection between the second mounting rod 43 and the first mounting rod 42 is located between the two ends of the second mounting rod 43. Multiple insert rods 411 are distributed on both sides of the first mounting rod 42, and at least two insert rods 411 are provided on each side of the first mounting rod 42. The height of all insert rods 411 on the same side of the first mounting rod 42 increases or decreases stepwise from the direction closer to the first mounting rod 42 to the direction away from the first mounting rod 42, and / or, the end of each insert rod 411 near the piston plate 21 is a conical structure.

[0028] The multiple insertion rods 411 can be evenly distributed on both sides of the first mounting rod 42, or they can be concentrated on both sides of the first mounting rod 42. For example, at least one insertion rod 411 can be provided at the end of both sides of the first mounting rod 42. The above-mentioned arrangement on both sides is preferably symmetrical. In some cases, it can also be asymmetrical. For example, N insertion rods 411 are provided on one side of the first mounting rod 42 and M insertion rods 411 are provided on the other side. N is not equal to M, and N is greater than or equal to 0 and M is greater than or equal to 0. The specific arrangement of the insertion rods 411 is not limited here.

[0029] The lengths of the multiple insert rods 411 can be the same or different, so as to achieve different damping effects at different positions during the axial movement of the piston plate 21 along the cylinder 10. In this embodiment, it is preferable that the lengths increase or decrease in a stepwise manner from the direction closer to the first mounting rod 42 to the direction farther away from the first mounting rod 42. Figure 3 The figure shows a step-decreasing pattern from the direction near the first mounting rod 42 to the direction away from the first mounting rod 42. The step-increasing pattern is not shown in the figure. The increment or decrement of the aforementioned step-increasing or step-decreasing patterns is not limited here. Optionally, the heights of the multiple insertion rods 411 can be different and not increase or decrease sequentially; alternatively, the lengths of the multiple insertion rods 411 can also be the same, but at least one insertion rod 411 has a tapered structure at the end near the piston plate 21 to achieve different damping effects at different positions during the axial movement of the piston plate 21 along the cylinder 10. Even when the lengths of the multiple insertion rods 411 are different, at least one insertion rod 411 can also be set to have a tapered structure at the end near the piston plate 21 (not shown in the figure), which is not specifically limited here.

[0030] At least one through hole on the piston plate 21 corresponds one-to-one with the position of the insertion rod 411 included in the aforementioned insert 41, such that when the piston plate 21 moves axially along the cylinder 10, each insertion rod 411 can be inserted into a corresponding through hole. Preferably, the shape of the through hole matches the shape of the insertion rod 411, and the diameter of each through hole is greater than or equal to the maximum radial dimension of the corresponding insertion rod 411; or, in some cases, the shapes do not match, but the diameter of each through hole is greater than or equal to the maximum radial dimension of the corresponding insertion rod 411. The insertion rod 411 can be a square prism, a circular prism, a prismatic cone, or a conical shape, etc., and its shape is not limited here.

[0031] In this embodiment, one end of the first mounting rod 42 is fixed inside the cylinder 10 along the axial direction. The first mounting rod 42 extends along the axial direction of the cylinder 10. The second mounting rod 43 is connected to the first mounting rod 42 and is arranged radially along the cylinder 10. Preferably, in this embodiment, the second mounting rod 43 is symmetrically arranged on both sides of the first mounting rod 42. In some possible cases, it may not be symmetrically arranged.

[0032] Optionally, one end of the second mounting rod 43 is connected to the first mounting rod 42, and the other end extends radially along the cylinder 10. In this case, the second mounting rod 43 is located on one side of the first mounting rod 42. The specific configuration is not limited here.

[0033] Thus, by setting the axially extending through-hole 41 to cooperate with the channel 23 on the piston plate 21, and designing the multiple inserts 411 included in the through-hole 41 to have different heights and / or conical ends, the passable area of ​​the channel 23 allowing the damping fluid to pass through decreases as the piston plate 21 moves axially toward the second end of the cylinder 10. This results in an increase in the damping force generated when the damping fluid flows through the channel 23 from the side of the piston plate 21 away from the piston rod 22 to the side closer to the piston rod 22, and a decrease in the damping force when the piston plate 21 moves axially toward the first end of the cylinder 10. In this way, the piston plate 21 can be moved axially at different distances according to the magnitude of the vibration energy of the device to be damped, thereby generating different magnitudes of damping force from the damping fluid, adapting to different usage requirements, and is simple to operate, convenient to use, and effectively improving adjustment efficiency.

[0034] In one possible embodiment, please refer to Figures 3 to 6The damping mechanism 40 also includes a connecting device 44 and a pair of first limiting members 45 spaced apart. One end of the first limiting member 45 is connected to the side of the piston plate 21 facing away from the piston rod, and the other end of the first limiting member 45 extends away from the piston plate 21 along the axial direction of the cylinder 10. The first mounting rod 42 is disposed between the pair of first limiting members 45 and extends along the axial direction of the cylinder 10. The outer wall of the first mounting rod 42 is provided with external threads. The connecting device 44 is sleeved on the outside of the first mounting rod 42 and threadedly connected to the first mounting rod 42. The second mounting rod 43 is installed on the connecting device 44.

[0035] Among them, a pair of first limiting members 45 are located on opposite sides of the connecting device 44 to restrict the connecting device 44 from rotating around the first mounting rod 42. The first mounting rod 42 is rotatably disposed inside the cylinder 10, and one end of the first mounting rod 42 away from the piston plate 21 extends out of the cylinder 10. The first mounting rod 42 is configured to be rotatable to drive the connecting device 44 to move axially along the cylinder 10.

[0036] The first limiting member 45 can be a tube, rod, or plate, as long as it can be clamped on the opposite sides of the connecting device 44 to restrict the connecting device 44 from rotating around the first mounting rod 42. There are no restrictions on this.

[0037] The connecting device 44 is sleeved on the outside of the first mounting rod 42 and threadedly connected to it. The second mounting rod 43 is fixedly connected to the connecting device 44 and connected to the first mounting rod 42 via the connecting device 44. The position of the connecting device 44 on the first mounting rod 42 is adjustable. A first limiting member 45 is disposed on the outside of the first mounting rod 42, and an opening is formed between a pair of spaced first limiting members 45 to allow the second mounting rod 43 connected to the connecting device 44 to extend outwards, thus restricting the position of the connecting device 44 and the second mounting rod 43, preventing them from rotating. In some cases, when the first mounting rod 42 rotates, the connecting device 44 is constrained by rotation, preventing it from rotating. Under the action of the threads, the connecting device 44 moves axially along the first mounting rod 42 to adjust the axial height of the second mounting rod 43 and the inserts 41 (i.e., multiple inserts 411) mounted on the second mounting rod 43 within the cylinder 10, thereby adjusting the axial distance between the piston plate 21 and the inserts 41 in the initial state. The initial state refers to the state of the vibration damping device 100 when the equipment to be damped is not vibrating. At this time, the piston plate 21 is relatively fixed inside the cylinder 10. It is easy to understand that by adjusting the axial distance between the piston plate 21 and the insert 41 in the initial state, the time when the insert 41 begins to insert into the channel 23 of the piston plate 21 when the piston plate 21 moves toward the second axial end of the cylinder 10 can be changed, that is, the time when the damping force generated by the damping mechanism 40 begins to increase can be adjusted. For example, when the axial distance between the piston plate 21 and the insert 41 decreases in the initial state, the time required for the piston plate 21 to move toward the second axial end of the cylinder 10 to the point where the insert 41 begins to insert into the channel 23 of the piston plate 21 also decreases, so that the time when the damping force generated by the damping mechanism 40 begins to increase also decreases, thereby quickly consuming the vibration energy of the equipment to be damped, and thus improving the efficiency of the vibration damping device 100 in suppressing the vibration of the equipment to be damped. Thus, in this application, the timing of the insertion of the insert 41 into the channel 23 of the piston plate 21 when the piston plate 21 begins to move can be adaptively adjusted according to the different magnitudes of vibration energy generated by the device to be damped, so as to adjust the time when the damping force of the damping mechanism 40 begins to increase, thereby improving the vibration suppression efficiency of the damping device 100.

[0038] The length of the first limiting member 45 is less than the maximum distance between the piston plate 21 and the cylinder 10 at the second end in the axial direction. The first limiting member 45 is also used to constrain the downward limit of the piston plate 21.

[0039] Thus, by providing a connecting device 44 and a first mounting rod 42 connected by threads, and restricting the connecting device 44 from rotating by a first limiting member 45, the first mounting rod 42 is rotated to drive the connecting device 44 to move axially along the cylinder 10, thereby adjusting the axial height of the second mounting rod 43 and the inserting member 41 within the cylinder 10, so as to adaptively adjust the timing of the inserting member 41 inserting into the channel 23 when the piston plate 21 starts to move according to the different magnitudes of vibration energy generated by the equipment to be vibration-damped, improve the efficiency of the vibration-damping device 100 in suppressing vibration, meet different usage requirements, have simple operation and convenient use, and effectively improve the adjustment efficiency. Moreover, providing the first limiting member 45 can also limit the maximum movement amplitude of the piston mechanism 20, improving the safety in use.

[0040] In a possible embodiment, refer to Figure 4 and Figure 6 , the connecting device 44 includes a movable block 441 and a connecting block 442; the movable block 441 is sleeved outside the first mounting rod 42 and is threadedly connected to the first mounting rod 42, the connecting block 442 is fixedly connected to the movable block 441 and is clamped between a pair of first limiting members 45, and the second mounting rod 43 is mounted on the connecting block 442. In a possible embodiment, refer to Figures 3 to 6 , the damping mechanism 40 further includes a pair of second limiting members 46 arranged at intervals, one end of each second limiting member 46 is fixed to the inner wall of the cylinder 10, and the other end of each second limiting member 46 extends axially along the cylinder 10 towards the piston plate.

[0041] Among them, the pair of second limiting members 46 corresponds to the pair of first limiting members 45 one by one, and each second limiting member 46 can be slidably mated with the corresponding first limiting member 45. Specifically, in the embodiments shown in Figure 4 and Figure 6 , both the first limiting member 45 and the second limiting member 46 are groove-shaped plates with a cross-section in the shape of a "C", and the second limiting member 46 is fitted with the corresponding first limiting member 45. In this embodiment, the position of the second limiting member 46 is closer to the first mounting rod 42 than the position of the corresponding first limiting member 45. It can be understood that the first limiting member 45 can be sleeved outside the second limiting member 46 when moving axially; in some possible cases, the position of the first limiting member 45 is closer to the first mounting rod 42, and it can be understood that the second limiting member 46 can be sleeved outside the first limiting member 45 when moving axially. Among them, in the embodiments shown in Figure 4 and Figure 6In the illustrated embodiment, the side of each second limiting member 46 near the first mounting rod 42 is flush with or recessed within the side of the corresponding first limiting member 45 near the first mounting rod 42, and the opening formed between a pair of second limiting members 46 communicates with the opening formed between a pair of first limiting members 45, so that the second mounting rod 43 connected to the connecting device 44 extends outward. The opposing "U"-shaped structure of the pair of first limiting members 45 or the pair of second limiting members 46 can engage and lock the connecting device 44 (or specifically, the connecting block 442) to restrict the position of the connecting device 44 and the second mounting rod 43, preventing the connecting device 44 and the second mounting rod 43 from rotating. Furthermore, since the first limiting members 45 and the second limiting members 46 engage with each other, the axial movement direction of the piston rod 22 and the piston plate 21 can be constrained in the axial direction, preventing deviation from the axial direction and reducing the occurrence of structural damage due to misalignment.

[0042] Of course, in other embodiments of this application, the first limiting member 45 and the second limiting member 46 may also be tubes, and the first limiting member 45 may be sleeved on the outside of the second limiting member 46, which is not limited.

[0043] In one possible embodiment, at least one of the first limiting member 45 and the second limiting member 46 is provided. When only the first limiting member 45 is provided, the highest position of the end of the first limiting member 45 away from the piston plate 21 is restricted to be lower than the lowest position of the second mounting rod 43, and the highest and lowest positions are defined relative to the first end of the cylinder 10 in the axial direction. That is, if only the first limiting member 45 is provided, the length of the first limiting member 45 is sufficient to prevent the connecting device 44 from rotating. When only the second limiting member 46 is provided, the lowest position of the end of the second limiting member 46 near the piston plate 21 is restricted to be higher than the highest position of the second mounting rod 43, and the highest and lowest positions are defined relative to the first end of the cylinder 10 in the axial direction. That is, if only the second limiting member 46 is provided, the length of the second limiting member 46 is sufficient to prevent the connecting device 44 from rotating.

[0044] Thus, by setting the first limiting member 45 and the second limiting member 46 that cooperate with each other, not only can the connecting device 44 be constrained from rotating, but the maximum range of movement of the piston mechanism 20 and the direction of axial movement can also be limited, thereby improving safety in use.

[0045] In one possible embodiment, please refer to Figure 1 , Figure 2 , Figure 3 , Figure 5The vibration damping device 100 also includes a rotating device 50 and a mounting base 60. The mounting base 60 is fixedly connected to the second end of the cylinder 10 in the axial direction. The mounting base 60 has an accommodating space, and the rotating device 50 is located inside the accommodating space. The end of the first mounting rod 42 away from the piston plate 21 passes through the second end of the cylinder 10 in the axial direction and the mounting base 60 and is connected to the rotating device 50. The rotating device 50 is used to drive the first mounting rod 42 to rotate, so as to adjust the height of the connecting device 44, the second mounting rod 43, and the insert 41 in the axial direction of the cylinder 10.

[0046] The rotating device 50 can be manually operated or connected to a motor. The motor allows for more precise adjustments, making the height adjustment of the second mounting rod 43 quantifiable and visible, and enabling more accurate adjustment. The motor can be any commercially available motor, and no limitation is made here.

[0047] In this embodiment, the rotating device 50 can be a turntable with a handle for rotation. The operator drives the turntable to rotate through the handle, thereby controlling the rotation of the first mounting rod 42.

[0048] Optionally, the mounting base 60 is also provided with at least two mounting holes for fixing. The mounting holes penetrate the mounting base 60, and the number of mounting holes is not limited here. They are symmetrically distributed on both sides of the mounting base 60. The mounting base 60 can be fixedly connected to the operating table or operating position through the mounting holes. Specifically, it can be fixed by means of plugs, screws, clips, etc., and the fixing method is not limited here.

[0049] Thus, by placing the rotating device 50 inside the accommodating space of the mounting base 60, the safety and stability of the rotating device 50 are ensured. This layout not only provides good protection for the rotating device 50, preventing it from being directly exposed to the external environment, but also effectively prevents the rotating device 50 from rotating unnecessarily due to accidental external impacts or collisions, thus affecting the vibration reduction effect in specific environments.

[0050] In one possible embodiment, please refer to Figure 2 , Figure 3 , Figure 5 The cylinder 10 also includes a mounting plate 12, which is disposed between the mounting base 60 and the cylinder 10, so that the cylinder 10 can be detached from the mounting base 60 and the mounting plate 12. Specifically, the second end of the cylinder 10 is sealed with the mounting plate 12, and the second end of the cylinder 10 is sealed by the mounting plate 12.

[0051] As can be understood, the cylinder 10 has a structure including a circumferential side surface and a bottom surface (first end), and the mounting plate 12 serves as the other bottom surface, making the cylinder 10 a sealed structure. The mounting plate 12 can be connected to the second end of the cylinder 10 by threads, facilitating the assembly and disassembly of the cylinder 10.

[0052] Thus, by setting up a detachable mounting plate 12, the assembly and replacement of the internal structure of the cylinder 10 becomes more convenient and faster, improving maintenance efficiency.

[0053] In one possible embodiment, please refer to Figure 2 The elastic reset member 30 includes a spring member, and the number of spring members is one or more. The spring members are located around the damping mechanism 40.

[0054] If there is only one spring component, the spring component is sleeved around the damping mechanism 40; if there are multiple spring components, the spring components are arranged symmetrically around the damping mechanism 40.

[0055] Among them, the elastic reset component may also be a metal bellows, etc., which is not limited here.

[0056] The first end of the elastic reset member 30 can be in contact with the side of the piston plate 21 facing away from the piston rod 22. For example, when the piston plate 21 moves axially toward the elastic reset member 30, the piston plate 21 contacts the elastic reset member 30 during the movement and applies pressure to the elastic reset member 30, causing the elastic reset member 30 to deform. The first end of the elastic reset member 30 and the side of the piston plate 21 facing away from the piston rod 22 can also be fixedly connected. The second end of the elastic reset member 30 is connected to the inner wall of the cylinder. Specifically, it can be connected to the side wall of the cylinder or the second end. The second end can be the inner wall of the cylinder itself or the aforementioned mounting plate 12.

[0057] In this embodiment, if the elastic reset member 30 includes at least two elastic elements, the elastic elements can be arranged circumferentially around the damping mechanism 40. For example, if there are two, they are symmetrically arranged on both sides; if there are three or more, they are symmetrically distributed around the damping mechanism 40. Preferably, in this embodiment, there is one elastic element, which is sleeved around the damping mechanism 40. This allows the elastic force provided by the elastic reset member 30 to be more evenly distributed on the piston plate 21.

[0058] Understandably, when the piston plate 21 moves downward, it exerts a squeezing effect on the elastic reset member 30. During this process, the damping fluid flows into the area where the piston plate 21 connects to the piston rod 22 through the channel 23 of the piston plate 21. Due to the cooperation between the channel 23 and the through-hole insert 41, a moving damping force is generated as the damping fluid flows through the channel 23, which can further consume the energy generated by the vibration and play a role in suppressing the vibration. During the vibration, the piston plate 21 reciprocates, and the moving damping force generated as the damping fluid flows through the channel 23 can further consume the energy generated by the vibration and play a role in suppressing the vibration. When the vibration ends, the elastic reset member 30 automatically resets, pushing the piston plate 21 to reset. During the reset process, the deformation of the elastic reset member 30 also further consumes the energy of the vibration, thereby ensuring that the vibration damping device 100 can quickly return to a stable state after the vibration ends; thus, the overall stability and operating efficiency of the system are improved.

[0059] Furthermore, when the vibration damping device 100 operates continuously for a long time, the piston plate 21 rubs against the inner wall of the cylinder 10, and the elastic reset member 30 generates heat during repeated compression and release. However, due to the thermal conductivity of the damping fluid, the energy generated by the friction between the piston plate 21 and the cylinder 10, as well as the energy generated by the compression and release of the elastic reset member 30, can be absorbed, thus avoiding excessively high operating temperature and extending the service life of the vibration damping device 100.

[0060] In one possible embodiment, please refer to Figure 2 and Figure 3 The piston plate 21 is provided with a one-way return structure, which includes an oil return hole 211 and a cover plate 212. The oil return hole 211 is a channel that runs through both sides of the piston plate 21. The cover plate 212 is located on the side of the piston plate 21 facing away from the piston rod 22 and is rotatably connected to the piston plate 21. The cover plate 212 covers the oil return hole 211. The opening and closing of the cover plate 212 is affected by the flow direction of the damping fluid. When the piston plate 21 moves toward the second end in the axial direction away from the cylinder 10, the cover plate 212 opens to allow the damping fluid to pass through, so that the damping fluid on the side of the piston plate 21 connected to the piston rod 22 flows to the other side of the piston plate 21, accelerating the piston plate 21 to reset under the action of the elastic reset member 30; when the piston plate 21 moves toward the second end in the axial direction closer to the cylinder 10, the cover plate 212 closes to prevent the damping fluid from passing through.

[0061] The cover plate 212 can be connected to the piston plate 21 by hinge or by torsion spring, so that the cover plate 212 can flip on the piston plate 21.

[0062] When the piston plate 21 moves axially toward the elastic reset member 30, the damping fluid on the side of the piston plate 21 near the damping mechanism 40 pushes the cover plate 212 to tightly adhere to the oil return hole 211, keeping the oil return hole 211 closed. At this time, the damping fluid on the side of the piston plate 21 near the damping mechanism 40 can only flow into the area of ​​the piston plate 21 near the piston rod 22 through the channel 23. When the piston plate 21 is reset under the action of the elastic reset member 30, the damping fluid in the area of ​​the piston plate 21 near the piston rod 22 pushes the cover plate 212 to flip open, keeping the oil return hole 211 unobstructed. At this time, the damping fluid can quickly flow back from the area near the piston rod 22 to the area of ​​the piston plate 21 near the damping mechanism 40, so as to improve the reset rate of the piston plate 21.

[0063] Optionally, the one-way reflux structure can also be a flexible valve (such as a duckbill valve or umbrella valve). The flexible valve is made entirely of elastic material, and its body or root has a specific thin-walled area or a pre-formed curved structure. This structure itself constitutes an elastic support, which can elastically deform and open under positive pressure difference, and return to its original position and close after the pressure difference disappears due to the elastic restoring force of the material itself. Alternatively, the one-way reflux structure can also be other forms of one-way valves or check valves. The aforementioned flexible valves, one-way valves, and check valves can be commercially available structures and are not limited here.

[0064] In one possible embodiment, please refer to Figure 1 , Figure 2 , Figure 5 The piston mechanism 20 also includes a support seat 24, which is connected to the second end of the piston rod 22. The support seat 24 is used to connect the device to be damped 70. The axial position of the support seat 24 relative to the piston rod 22 is adjustable to adapt to the position of the device to be damped 70.

[0065] The support seat 24 is used to connect the device to be vibration damped 70. When the support seat 24 is subjected to vibration from the device to be vibration damped, the support seat 24 drives the piston rod 22 and the piston plate 21 to move.

[0066] The support seat 24 is adjustable or fixed in height relative to the piston rod 22. The height of the support seat 24 can be adjusted by changing the structure of the piston rod 22, for example, by setting the piston rod 22 as a telescopic rod, so that the height of the support seat 24 is adjustable.

[0067] In one possible embodiment, please refer to Figure 5The piston mechanism 20 also includes an adjusting support rod 25 and a locking structure 26. The locking structure 26 is located at the second end of the piston rod 22. One end of the adjusting support rod 25 is fixed to the support seat 24. An installation channel 27 is opened at the end of the second end of the piston rod 22 along the axial direction of the piston rod 22. The adjusting support rod 25 is slidably inserted into the installation channel 27. The locking structure 26 is used to fix the adjusting support rod 25 to fix the height of the support seat 24 in the axial direction of the piston rod 22.

[0068] The piston rod 22 may have a threaded structure at its second end. A locking structure 26 is threadedly connected to the second end of the piston rod 22. Rotating the locking structure 26 tightens the second end of the piston rod 22, thereby fixing the position of the adjusting support rod 25. Optionally, the locking structure 26 may be at least one screw structure. Specifically, the screw structure penetrates the side wall of the second end of the piston rod 22 and is radially arranged along the piston rod 22. The first end of the screw structure is outside the piston rod 22, and the second end is inserted into the piston rod 22, contacting and connecting with the adjusting support rod 25. Rotating the first end of the screw structure can cause it to press against or loosen the side wall of the adjusting support rod 25, thus fixing the position of the adjusting support rod 25.

[0069] During operation, first tighten the locking structure 26 to release the limit on the adjusting support rod 25, then adjust the length of the adjusting support rod 25 so that the support seat 24 presses against the vibration damping device 70. Then tighten the locking structure 26 to limit the adjusting support rod 25 again, so that the adjusting support rod 25 and the support seat 24 remain stable.

[0070] Optionally, a retaining spring can be installed axially inside the installation channel 27 on the piston rod 22. The retaining spring pushes the adjusting support rod 25 and the support seat 24 axially to move and automatically press against the vibration damping device 70, thus making the operation process more convenient.

[0071] In one possible embodiment, please refer to Figure 2 The cylinder 10 is also provided with an oil change port 13, which is a channel connecting the inner cavity of the cylinder 10 with the outside.

[0072] When the internal damping fluid needs to be replaced, the damping fluid inside the cylinder 10 is replaced through the oil change port 13 to ensure that the performance of the damping fluid remains within a usable range. The oil change port 13 can be located at any position on the side wall of the cylinder 10. The number of oil change ports 13 is not limited here.

[0073] For example, the aforementioned vibration damping equipment can be devices in the hydraulic system of a turbine governor, specifically, such as oil pumps and motors. As a core auxiliary control device of a hydro-generator unit, the turbine governor's operational quality directly affects the safety and stability of the unit's operation, and reducing the governor's failure rate is a key means to improve the unit's operational reliability. In the turbine governor's hydraulic system, oil pump 71 undertakes the core function of transmitting pressurized oil through pipelines to the main guide vane system, the main blade system, and the auxiliary pressurized oil system. Through the precise control of the guide vane and blade openings by the main guide vane system and the main blade system, effective control of the unit's operating status is achieved. Oil pump 71 is prone to vibration during operation, and the return oil pressure suddenly increases at the moment of pump start-up and shutdown, causing severe vibration in the oil outlet pipeline. These vibrations not only affect the control accuracy of the hydraulic system but may also cause problems such as loosening of pipeline connections and fatigue damage of components, and in severe cases, even threaten the overall operational safety of the unit.

[0074] Please see Figure 7 This application also provides a hydraulic system 1000, including: an oil pump 71, a motor 72, and a vibration damping device 100 as described in one or more of the above embodiments; the oil pump 71 is connected to the motor 72, and the second end of the piston rod 22 in the vibration damping device 100 is used to support the oil pump 71 to reduce the vibration of the oil pump 71. In this application, the hydraulic system 1000 may be, but is not limited to, the above-described turbine governor hydraulic system, and may also be other hydraulic systems with vibration damping devices, without limitation.

[0075] The oil pump 71 is connected to an oil outlet pipe 711 and an oil inlet pipe 712.

[0076] The oil pump 71 is connected to the output end of the motor 72. One end of the oil inlet pipe 712 is connected to the output end of the oil pump 71, and the other end is connected to the input end of the return oil tank through a hose. One end of the oil outlet pipe 711 is connected to the input end of the oil pump 71, and the other end is connected to the output end of the return oil tank through a hose. During operation, at the moment when the oil pump 71 starts or stops, due to the rapid change in the internal pressure of the system, the return oil pressure will suddenly increase significantly, causing the oil outlet pipe 711 and the oil pump 71 to vibrate. In addition, the operation of the motor 72 will also cause the oil pump 71 to vibrate. These vibrations will be transmitted to the support seat 24 in the vibration damping device 100.

[0077] In this way, by setting up the vibration damping device 100, the vibration energy generated when the oil pump 71 is working is converted into other forms of energy, thereby effectively suppressing the vibration of the oil pump 71.

[0078] It should be noted that in the embodiments of the present invention, "multiple" refers to two or more.

[0079] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A vibration damping device, characterized in that, include: The cylinder has an inner cavity filled with damping fluid, and the cylinder has a through hole at the first axial end that communicates with the inner cavity; A piston mechanism includes a piston plate and a piston rod. The piston plate is disposed in the inner cavity and is slidably connected to the inner circumferential wall of the cylinder. The piston plate has a channel extending through both sides along the thickness direction for the damping fluid to flow. The piston rod is slidably inserted through the through hole along the axial direction of the cylinder. The first end of the piston rod is connected to the piston plate, and the second end extends out of the cylinder to support the vibration damping device. An elastic reset member is disposed within the inner cavity of the cylinder, wherein a first end of the elastic reset member is connected to the side of the piston plate opposite to the piston rod, and a second end is connected to the inner wall of the cylinder; and A damping mechanism is provided in the inner cavity of the cylinder and located on the side of the piston plate opposite to the piston rod. The damping mechanism includes a through-hole extending along the axial direction of the cylinder, and the through-hole corresponds to the channel on the piston plate. When the piston rod is subjected to an external force and drives the piston plate to move towards the second end of the cylinder in the axial direction, the insert is inserted into the channel to reduce the flow area of ​​the channel, and the piston plate squeezes the elastic reset member; when the piston rod is not subjected to the external force, the elastic reset member restores its deformation and pushes the piston plate and the piston rod to move away from the second end of the cylinder in the axial direction.

2. The vibration damping device according to claim 1, characterized in that, The damping mechanism includes a first mounting rod and a second mounting rod. The first mounting rod is fixedly disposed inside the cylinder, and the second mounting rod is connected to the first mounting rod and extends radially along the cylinder. The through-hole consists of a plurality of inserts disposed on the second mounting rod, each insert extending axially along the cylinder. The channel includes a plurality of through holes corresponding one-to-one with the plurality of inserts. The diameter of each through hole is greater than or equal to the maximum radial dimension of the corresponding insert. The connection between the second mounting rod and the first mounting rod is located between the two ends of the second mounting rod. The plurality of insert rods are distributed on both sides of the first mounting rod, and at least two insert rods are respectively provided on each side of the first mounting rod. The height of all the insert rods located on the same side of the first mounting rod increases or decreases in steps from the direction closer to the first mounting rod to the direction farther away from the first mounting rod, and / or, the end of each insert rod near the piston plate is a conical structure.

3. The vibration damping device according to claim 2, characterized in that, The damping mechanism further includes a connecting device and a pair of first limiting members spaced apart. One end of the first limiting member is connected to the side of the piston plate facing away from the piston rod, and the other end of the first limiting member extends away from the piston plate along the axial direction of the cylinder. The first mounting rod is disposed between the pair of first limiting members and extends along the axial direction of the cylinder. The outer wall of the first mounting rod is provided with external threads. The connecting device is sleeved on the outside of the first mounting rod and threadedly connected to the first mounting rod. The second mounting rod is installed on the connecting device. The pair of first limiting members are located on opposite sides of the connecting device to restrict the connecting device from rotating about the first mounting rod. The first mounting rod is rotatably disposed in the cylinder, and one end of the first mounting rod away from the piston plate extends out of the cylinder. The first mounting rod is configured to be rotatable to drive the connecting device to move axially along the cylinder.

4. The vibration damping device according to claim 3, characterized in that, The damping mechanism further includes a pair of second limiting members spaced apart, one end of the second limiting member being fixed to the inner wall of the cylinder, and the other end of the second limiting member extending toward the piston plate along the axial direction of the cylinder; The pair of second limiting members corresponds one-to-one with the pair of first limiting members, and each second limiting member slides in cooperation with the corresponding first limiting member.

5. The vibration damping device according to claim 3, characterized in that, The vibration damping device further includes a rotating device and a mounting base; the mounting base is fixedly connected to the second end of the cylinder in the axial direction, the mounting base has an accommodating space, and the rotating device is located inside the accommodating space. The end of the first mounting rod away from the piston plate passes through the second end of the cylinder in the axial direction and the mounting base and is connected to the rotating device. The rotating device is used to drive the first mounting rod to rotate so as to adjust the height of the second mounting rod in the axial direction of the cylinder.

6. The vibration damping device according to any one of claims 1-5, characterized in that, The piston plate is provided with a one-way reflux structure, which includes an oil return hole and a cover plate. The oil return hole is a channel that runs through both sides of the piston plate. The cover plate is located on the side of the piston plate facing away from the piston rod and is rotatably connected to the piston plate. The cover plate covers the oil return hole. The opening and closing of the cover plate is affected by the flow direction of the damping fluid. Specifically, when the piston plate moves toward the second end in the axial direction away from the cylinder, the cover plate opens to allow the damping fluid to pass through, allowing the damping fluid on the side of the piston plate connected to the piston rod to flow to the other side of the piston plate, accelerating the piston plate to reset under the action of the elastic reset member; when the piston plate moves toward the second end in the axial direction closer to the cylinder, the cover plate closes to prevent the damping fluid from passing through.

7. The vibration damping device according to any one of claims 1-5, characterized in that, The elastic reset component includes a spring component, and the number of the spring components is one or more, and the spring components are disposed around the damping mechanism. Wherein, if there is only one spring, the spring is sleeved around the damping mechanism; if there are multiple springs, the springs are arranged symmetrically around the damping mechanism.

8. The vibration damping device according to any one of claims 1-5, characterized in that, The piston mechanism further includes a support base connected to the second end of the piston rod. The support base is used to connect the device to be vibration damped. The axial position of the support base relative to the piston rod is adjustable to adapt to the position of the device to be vibration damped.

9. The vibration damping device according to claim 8, characterized in that, The piston mechanism further includes an adjusting support rod and a locking structure. The locking structure is located at the second end of the piston rod. One end of the adjusting support rod is fixed to the support seat. An installation channel is formed at the end of the second end of the piston rod along the axial direction of the piston rod. The adjusting support rod is slidably inserted into the installation channel. The locking structure is used to fix the adjusting support rod to fix the height of the support seat in the axial direction of the piston rod.

10. A hydraulic system, characterized in that, include: Oil pump, motor, and vibration damping device as described in any one of claims 1-9; The oil pump is connected to the motor, and the second end of the piston rod in the vibration damping device is used to support the oil pump to reduce the vibration of the oil pump.

Images