A one-way valve and a piston and variable stiffness viscous damper having the same

Abstract

The application discloses a one-way valve, a piston with the same and a variable stiffness viscous damper, relates to the technical field of bridge anti-seismic dampers and discloses the one-way valve which comprises a valve body, a connecting column, a deformable baffle and a stopper. The edge of the deformable baffle is sealed and attached to the inner side wall of the valve body, and the stopper is further arranged, so that the circulation and closure of liquid in the one-way valve are realized. The piston comprises a piston body. The piston body provides support for the device, and the flow rate and flow of liquid medium circulation can be controlled through the damping holes formed in the piston body. The variable stiffness viscous damper comprises a cylinder body, a partition plate, a piston rod, a reset spring, a head connecting ring and a tail connecting ring. The piston rod is pushed by the head connecting ring and the tail connecting ring connected with the bridge and the pier, so that the damping liquid in the cylinder body flows, and the earthquake impact is slowed down. In the application, the one-way valve is installed on the piston in the viscous damper, the stiffness is variable, and the viscous damper can be automatically reset to cope with different levels of earthquakes.

Description

Technical Field

[0001] This invention relates to the field of bridge seismic damping technology, and more specifically to a one-way valve and a piston and variable stiffness viscous damper having the same. Background Technology

[0002] Earthquakes and strong winds are both highly destructive natural disasters. These disasters are extremely damaging to large bridges and high-rise buildings, causing serious safety hazards and economic losses. Therefore, how to minimize the threat to human safety and economic damage posed by earthquake and wind disasters has become a very serious problem.

[0003] Traditional earthquake-resistant design relies on increasing the structural stiffness by adding weight and cross-section to piers or increasing reinforcement to resist earthquakes. This involves utilizing the plastic deformation and hysteretic energy dissipation of beams and columns to absorb energy generated by structural vibrations. However, this energy dissipation method, which comes at the cost of structural damage or even destruction, is undesirable. In recent years, energy dissipation devices have been installed on structures. These devices utilize the relative displacement and velocity generated during vibration to absorb the structure's vibrational energy, reducing its vibrational response and achieving vibration reduction and energy dissipation. Common vibration reduction and energy dissipation devices are classified as velocity-type and displacement-type. Metal dampers and friction dampers are displacement-type dampers; the energy they consume and the damping force they provide are related to the relative displacement during structural vibration. The greater the relative displacement, the better the energy dissipation and vibration reduction effect. Viscoelastic dampers and viscous dampers are velocity-type dampers; the greater the relative velocity during structural vibration, the greater the damping force these two types of dampers can provide.

[0004] However, the requirements for energy dissipation and damping devices differ depending on the magnitude of the earthquake. In the face of minor earthquakes or wind loads, the energy dissipation and damping devices need to provide the structure with initial stiffness to resist seismic and wind loads. Under medium- to high-intensity earthquakes, larger damping is required to dissipate the energy generated by the earthquake and reduce structural damage. However, viscous dampers themselves lack stiffness, making it difficult to achieve variable stiffness. Furthermore, viscous dampers do not have self-resetting capabilities, resulting in significant residual displacement in the structure and affecting post-earthquake traffic.

[0005] Therefore, how to provide a one-way valve that can provide both stiffness and damping and has a self-resetting function, as well as a piston and variable stiffness viscous damper with it, is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] In view of this, the present invention provides a one-way valve and a piston and a variable stiffness viscous damper having the same, aiming to solve the above-mentioned technical problems.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] This invention provides a one-way valve, comprising:

[0009] The valve body has an opening at its top and multiple flow channel holes at its bottom.

[0010] A connecting column, the bottom end of which is fixed at the center of the bottom surface of the valve body cavity, and an annular flow channel is formed between the connecting column and the side wall of the valve body, and the annular flow channel communicates with the flow channel hole;

[0011] A deformable baffle plate is fixed to the top of the connecting column, and the edge of the deformable baffle plate is sealed and fitted to the inner wall of the valve body;

[0012] A limiting part is fixed on the inner wall of the valve body and located between the deformable baffle and the top opening of the valve body.

[0013] Through the above technical solution, the present invention provides a one-way valve, wherein the connecting column is fixed at the center of the bottom surface of the valve body cavity, and an annular flow channel for liquid flow is formed between the connecting column and the side wall of the valve body. A deformable baffle is fixed at the top of the connecting column, and the edge of the deformable baffle is sealed and fitted to the side wall of the valve body. The opening and closing of the one-way valve can be realized by bending and resetting the deformable baffle. The bending and resetting of the deformable baffle is determined according to the pressure of the one-way valve. When the liquid pressure is low, it blocks; when the liquid pressure is high, it flows. This allows the device to realize the opening and closing of the valve according to the change of external pressure. The one-way valve in the present invention has wider applicability and can be used in many fields.

[0014] Preferably, in the above-mentioned one-way valve, the limiting part includes a plurality of stops fixed on the inner wall of the valve body, and the plurality of stops abut against the deformable baffle. Because the stops are fixed on the inner wall of the valve body and abut against the deformable baffle, when the liquid flows in the opposite direction, due to the presence of the stops, the one-way valve is in a closed state regardless of the pressure, thus ensuring the one-way flow of liquid through the one-way valve.

[0015] Preferably, in the aforementioned one-way valve, the deformable baffle is made of a plastically deformable metal material. Due to the unique material of the deformable baffle, it can be bent and reset multiple times to ensure the flow and blockage of the liquid medium. While ensuring the one-way flow of liquid in the one-way valve, it also extends the service life of the one-way valve.

[0016] The beneficial effects of the above technical solution are as follows: when the pressure on the check valve is different, the deformable baffle inside the check valve can change with the magnitude of the pressure. When the check valve is in the closed state, it provides rigidity to the device; when the check valve is in the flow state, the rigidity of the device is variable. Therefore, it is convenient to control the flow rate and accuracy of the check valve.

[0017] The present invention also provides a piston, including a piston body, wherein a plurality of damping holes are provided on the piston body, and each damping hole has one and only one end fixed with a one-way valve as described above; the valve bodies installed on both sides of the piston body are installed in opposite directions, and the number of valve bodies installed on both sides of the piston body is equal.

[0018] Through the above technical solution, when the piston body provided by the present invention generates relative displacement, the circulating liquid flows repeatedly in the holes opened on the piston body. Because the damping holes are equipped with one-way valves of equal number in opposite directions, the energy required to drive the piston body to reciprocate is the same, which ensures the balance of the piston body and improves the stability of the device.

[0019] Preferably, in the piston described above, a plurality of damping holes are evenly distributed in a ring on the piston body. The damping holes are used for the flow of liquid medium. Because the damping holes are evenly distributed in a ring, the loss of the piston body by the flowing liquid medium is low during the piston's work. Moreover, during the reciprocating motion of the piston body, the pressure on both sides of the piston can be changed, and the energy generated by the piston's work can be artificially adjusted by the number of damping holes. This allows the piston to no longer be limited to the currently known field and expands the applicable scenarios of the piston of this device.

[0020] Preferably, in the piston described above, multiple valve bodies on the same side of the piston body are spaced apart and mounted on multiple damping holes. The damping holes on one side are arranged at intervals and do not affect each other, further ensuring the balance of the piston body.

[0021] Preferably, in the aforementioned piston, a connecting hole is provided at the center of the piston body. The connecting hole is used to connect and fix the piston body to other structures, enhancing the overall integrity of the piston and improving the stability of the device.

[0022] The beneficial effects of the above technical solution are as follows: because the damping orifice is equipped with one-way valves of equal number in opposite directions, the one-way flow of the liquid medium is ensured. When the flow direction of the liquid medium is consistent with the installation direction of the one-way valve and a certain pressure is reached, the one-way valve opens, and the energy generated by the piston's work increases. Therefore, under the premise that the diameter of the damping orifice is the same, no matter how the piston body moves, the overall device provides the same stiffness and energy to the structure.

[0023] The present invention also provides a variable stiffness damper, comprising:

[0024] The cylinder body has a partition plate fixed inside, which divides the cylinder body into a first sealing cavity and a second sealing cavity. The piston described above is slidably connected in the second sealing cavity. The second sealing cavity is filled with a viscous damping medium.

[0025] A piston rod passes sequentially through the partition plate, the piston body, and the cylinder. The piston rod is fixedly connected to the piston body and is slidably and sealingly connected to the partition plate and the cylinder. A return spring is sleeved on the piston rod located in the first sealed cavity. The two ends of the return spring are fixedly connected between the end of the piston rod and the partition plate, respectively.

[0026] Through the above technical solution, this invention provides a variable stiffness damper. When the variable stiffness damper is subjected to external excitation, the piston begins to reciprocate. Since the volume of the piston rod entering the cylinder is constant, it will not affect the pressure of the liquid inside the cylinder. Therefore, a vacuum will not occur inside the cylinder, nor will the piston rod be blocked from moving freely due to excessive pressure inside the cylinder. The piston rod viscous damper has a symmetrical structure, stable damping force output under various working conditions, and the manufacturing process of the viscous damper is simple, with a full hysteresis curve and good energy dissipation capacity. In addition, one end of the return spring in this invention is fixed to one end of the piston rod, and the other end of the return spring is fixed to the partition plate. During an earthquake, the reciprocating motion of the piston rod will drive the return spring to stretch or compress, providing stiffness to the structure. It can also provide restoring force after the earthquake, allowing the piston to return to its pre-earthquake position and reducing residual displacement between the piers and beams.

[0027] Preferably, in the above-mentioned variable stiffness damper, a head connecting ring is fixed to the outer wall of the first sealing cavity, and a tail connecting ring is fixed to the end of the piston rod away from the first sealing cavity. The head connecting ring and the tail connecting ring allow for more accurate relative displacement of the damper caused by an earthquake; and facilitate smooth movement of the piston rod and piston during post-earthquake reset.

[0028] As can be seen from the above technical solution, compared with the prior art, the present invention discloses a one-way valve and a piston and variable stiffness viscous damper having the same, which has the following beneficial effects:

[0029] 1. The present invention ensures the one-way flow of liquid through the one-way valve device, reduces the number of working damping holes, increases the damping force, and can dissipate a large amount of seismic energy, thus effectively resisting earthquakes.

[0030] 2. The present invention, through the setting of the piston device, enables the overall device to change the stiffness and damping of the structure according to different external conditions, so as to adapt to wind loads and earthquakes of various levels.

[0031] 3. In addition to the above-mentioned technical effects, the present invention, through the setting of a variable stiffness damper device, can provide restoring force after the earthquake with the addition of a spring, so that the piston returns to its original position and reduces the residual displacement between the pier and the beam. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0033] Figure 1 The attached figure is a schematic diagram of the one-way valve in the closed state provided by the present invention;

[0034] Figure 2 The attached figure is a schematic diagram of the one-way valve provided by the present invention in the open state;

[0035] Figure 3 The attached figure is a structural schematic diagram of one side of the piston body provided by the present invention;

[0036] Figure 4 The attached figure is a schematic diagram of the structure of the other side of the piston body provided by the present invention;

[0037] Figure 5 The attached figure is a structural schematic diagram of the variable stiffness viscous damper provided by the present invention.

[0038] in:

[0039] 1-Valve body, 2-Flow channel hole, 3-Connecting column, 4-Annular flow channel, 5-Deformable baffle, 6-Limiting part, 7-Stop block, 8-Piston body, 9-Damping hole, 10-Connecting hole, 11-Cylinder body, 12-Divider plate, 13-First sealing cavity, 14-Second sealing cavity, 15-Piston rod, 16-Reset spring, 17-Head connecting ring, 18-Tail connecting ring. Detailed Implementation

[0040] The technical solutions of the 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 present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] Example 1:

[0042] See appendix Figure 1-2 This invention discloses a one-way valve, comprising:

[0043] Valve body 1, with an opening at the top and multiple flow channel holes 2 at the bottom;

[0044] The bottom end of the connecting column 3 is fixed at the center of the bottom surface of the inner cavity of the valve body 1. An annular flow channel 4 is formed between the connecting column 3 and the side wall of the valve body. The annular flow channel 4 is connected to the flow channel hole 2.

[0045] Deformable baffle 5 is fixed to the top of the connecting column 3, and the edge of the deformable baffle 5 is sealed and fitted to the inner wall of the valve body 1.

[0046] The limiting part 6 is fixed on the inner wall of the valve body 1 and is located between the deformable baffle 5 and the top opening of the valve body 1.

[0047] To further optimize the above technical solution, the limiting part 6 includes multiple blocks 7 on the inner wall of the fixed valve body 1, and the multiple blocks 7 abut against the deformable baffle 5; the blocks 7 restrict the deformation direction of the deformable baffle 5, so that the deformable baffle 5 can only bend inward to the valve body 7, thereby ensuring the one-way flow of the one-way valve.

[0048] To further optimize the above technical solution, the deformable baffle 5 is a plastically deformable metal material. Since the deformation and reset of the deformable baffle 5 are determined by the pressure on the one-way valve, the pressure inside the one-way valve will also change repeatedly. Since the deformable baffle 5 will be repeatedly subjected to forces in both positive and negative directions, the deformable baffle 5 is a plastically deformable metal material, such as hard aluminum alloy, sulfur, tin, lead alloy, etc.

[0049] The working process of this embodiment is as follows:

[0050] Before use, the bottom of the one-way valve in this invention is installed on the damping hole 9 of the piston body 8, with the opening of the one-way valve facing outward. When facing small earthquakes and wind loads, the pressure inside the cylinder is small, and the edge of the deformable baffle 5 is tightly attached to the baffle 7. At this time, the viscous damping fluid inside the cylinder cannot flow, providing rigidity for the overall device. When facing large earthquakes and wind loads, the pressure inside the cylinder is large, and the deformable baffle 5 bends inward toward the valve body 7. At this time, an annular flow channel 4 is formed between the connecting column 3 and the valve body 7, and the viscous damping medium flows through the flow channel hole 2 to provide greater damping for the device.

[0051] This embodiment provides a one-way valve that can ensure the stable flow of liquid media.

[0052] Example 2:

[0053] See appendix Figure 3 -Appendix Figure 4 The present invention discloses a piston, including: a piston body 8, a piston body 9 having multiple damping holes on the piston body 8, and each damping hole piston body 9 having a one-way valve of embodiment 1 fixed at one and only one end; the valve bodies 1 installed on both sides of the piston body 8 are installed in opposite directions, and the number of valve bodies 1 installed on both sides of the piston body 8 is equal.

[0054] To further optimize the above technical solution, multiple damping holes 9 are evenly distributed in a ring on the piston body 8; the piston body 8 in this invention has 6 damping holes 9, and three one-way valve devices are installed on each side of the piston body 8, as shown in the attached figure. Figure 3-4 As shown in the position arrangement, due to the one-way flow of the one-way valve, no matter whether the piston moves to the left or right, there will be three damping holes 9 on one side that can work. With the same hole diameter, the fewer the number of damping holes 9, the greater the damping force provided by the damper. If the number of damping holes 9 with the same cross-sectional area is reduced from six to three, the output energy will increase by about 30% when the piston body 8 moves at the same speed.

[0055] To further optimize the above technical solution, multiple valve bodies 1 on the same side of the piston body 8 are installed at intervals on multiple damping holes 9. The three damping holes 9 on one side are arranged at intervals, and each pair does not affect the other, further ensuring the stable flow of the liquid medium.

[0056] To further optimize the above technical solution, a connection hole 10 is provided at the center of the piston body 8.

[0057] This embodiment provides a piston that can increase output power and enhance the overall balance and stability of the device.

[0058] Example 3:

[0059] See appendix Figure 5 This invention discloses a variable stiffness viscous damper, comprising:

[0060] The cylinder body 11 has a partition plate 12 fixed inside it, which divides the cylinder body 11 into a first sealing cavity 13 and a second sealing cavity 14. The piston in the above embodiment 2 is slidably connected in the second sealing cavity 14. The second sealing cavity 14 is filled with liquid silicone oil.

[0061] The piston rod 15 passes sequentially through the partition plate 12, the piston body 8, and the cylinder 11. The piston rod 15 is fixedly connected to the piston body 8 and is slidably connected to the partition plate 12 and the cylinder 11. A return spring 16 is sleeved on the piston rod located in the first sealing cavity 13. The two ends of the return spring 16 are fixedly connected between the end of the piston rod 15 and the partition plate 12, respectively. Since the volume of the piston rod 15 entering the cylinder 11 is constant, the piston rod 15 will not affect the pressure of the liquid in the cylinder, and a vacuum will not occur in the cylinder 11. The piston rod 15 will not be blocked and unable to move freely due to excessive pressure in the cylinder 11.

[0062] To further optimize the above technical solution, a head connecting ring 17 is fixed on the outer wall of the first sealing cavity 13, and a tail connecting ring 18 is fixed at the end of the piston rod 15 away from the first sealing cavity 13. The head connecting ring 17 and the tail connecting ring 18 of the variable stiffness viscous damper provided in this embodiment are respectively connected to the pier and the bridge. When an earthquake occurs, a relative displacement occurs between the pier and the bridge, thereby generating a relative displacement between the head connecting ring 17 and the tail connecting ring 18, which makes the relative displacement generated by the damper due to the earthquake more accurate. During the post-earthquake reset, a reset spring can be used to help the piston rod 15 and the piston body 8 to complete the reset smoothly.

[0063] The working process of this embodiment is as follows:

[0064] During an earthquake, relative displacement occurs between the head connecting ring 17 and the tail connecting ring 18. The piston rod 15 moves left and right within the cylinder 11, causing the viscous damping medium to pass through the damping hole 9. The viscous damping medium rubs against the damping hole 9, converting the energy generated by the earthquake into heat energy, thus achieving the purpose of energy dissipation. Meanwhile, the return spring 16 is compressed or stretched accordingly as the piston rod 15 moves left and right. The return spring 16 can provide restoring force, causing the piston body 8 to return to the pre-earthquake position, reducing the residual displacement between the pier and the beam. Since the volume of the piston rod 15 entering the cylinder 11 is constant, the piston rod 15 will not affect the pressure of the liquid inside the cylinder, and a vacuum will not occur inside the cylinder. Furthermore, the piston rod 15 will not be blocked from moving freely due to excessive pressure inside the cylinder. Therefore, under small earthquakes or wind loads, the damping orifice 9 closes, providing structural stiffness to resist earthquake and wind loads. Under medium to high intensity earthquakes, the damping orifice 9 opens, the viscous damper operates, providing greater damping to the structure and dissipating earthquake energy. The one-way valve also determines whether to block the flow based on the direction of liquid flow; it allows flow when a certain pressure is reached in the forward flow and blocks flow in the reverse direction.

[0065] This embodiment provides a variable stiffness viscous damper that can dissipate a large amount of seismic energy, effectively resist earthquakes, provide restoring force after an earthquake to return the piston to its original position, and change the stiffness and damping of the structure according to different external conditions to adapt to wind loads and earthquakes of various magnitudes.

[0066] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0067] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A variable stiffness viscous damper, characterized in that, include: One-way valve, piston, cylinder and piston rod; The one-way valve includes a valve body (1), a connecting column (3), a deformable baffle (5), and a limiting part (6). The valve body (1) has an opening at the top and multiple flow channel holes (2) at the bottom. The bottom of the connecting column (3) is fixed at the center of the bottom surface of the inner cavity of the valve body (1). An annular flow channel (4) is formed between the connecting column (3) and the side wall of the valve body. The annular flow channel (4) communicates with the flow channel holes (2). The deformable baffle (5) is fixed at the top of the connecting column. The edge of the deformable baffle (5) is sealed and fitted to the inner side wall of the valve body (1). The limiting part (6) is fixed on the inner side wall of the valve body (1) and is located between the deformable baffle (5) and the opening at the top of the valve body (1). The piston includes a piston body (8), on which a plurality of damping holes (9) are provided, and each damping hole (9) has a one-way valve fixed at one end; the valve bodies (1) installed on both sides of the piston body (8) are installed in opposite directions, and the number of valve bodies (1) installed on both sides of the piston body (8) is equal. A partition plate (12) is fixed inside the cylinder (11), which divides the cylinder (11) into a first sealing cavity (13) and a second sealing cavity (14). The piston is slidably connected in the second sealing cavity (14). The second sealing cavity (14) is filled with a viscous damping medium. The piston rod (15) passes through the partition plate (12), the piston body (8) and the cylinder (11) in sequence. The piston rod (15) is fixedly connected to the piston body (8), and the piston rod (15) is slidably connected to the partition plate (12) and the cylinder (11). A return spring (16) is sleeved on the piston rod located in the first sealing cavity (13). The two ends of the return spring (16) are fixedly connected between the end of the piston rod (15) and the partition plate (12).

2. The variable stiffness viscous damper according to claim 1, characterized in that, The limiting part (6) includes a plurality of stops (7) fixed on the inner side wall of the valve body (1), and the plurality of stops (7) abut against the deformable baffle (5).

3. A variable stiffness viscous damper according to claim 1, characterized in that, The deformable baffle (5) is a plastically deformable metal material.

4. A variable stiffness viscous damper according to claim 1, characterized in that, Multiple damping holes (9) are evenly distributed in a ring on the piston body (8).

5. A variable stiffness viscous damper according to claim 1, characterized in that, Multiple valve bodies (1) on the same side of the piston body (8) are spaced apart and mounted on multiple damping holes (9).

6. A variable stiffness viscous damper according to claim 1, characterized in that, A connecting hole (10) is provided at the center of the piston body (8).

7. A variable stiffness viscous damper according to claim 1, characterized in that, A head connecting ring (17) is fixed on the outer wall of the first sealing cavity (13), and a tail connecting ring (18) is fixed at the end of the piston rod (15) away from the first sealing cavity (13).

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