An eddy current damping energy dissipation type elevator buffer

Abstract

This invention relates to the technical field of elevator buffers, and discloses an eddy current damping energy-dissipating elevator buffer. The invention includes an outer buffer tube and a mounting chamber formed within the outer buffer tube. This invention achieves the effect of a novel buffer through a stationary / moving component, making it suitable for elevators at any speed. Its damping force increases with speed, thereby improving the buffering effect. The eddy current damping characteristic enables a rebound-free buffering process. The eddy current damping force moves in the opposite direction to the moving component, preventing the moving component from rising again. Furthermore, the eddy current damping force itself is a dissipative damping force, preventing the generation of reaction force and achieving a smooth buffering process. A reset component ensures smooth buffer movement and post-movement reset. Simultaneously, the buffer stroke is short, and the pit depth is shallow, saving installation space.

Description

Technical Field

[0001] This invention relates to the technical field of elevator buffers, and in particular to an eddy current damping energy-dissipating elevator buffer. Background Technology

[0002] Eddy current dampers are damping systems based on the principle of electromagnetic induction. When a conductor moves in a magnetic field and cuts magnetic field lines, eddy currents are generated in the conductor, dissipating energy and generating eddy current damping force, which hinders the relative motion between the stator and the rotor. This type of damper has a simple structure and reliable operating characteristics, and it does not directly contact or rub against mechanical parts during operation, so its performance does not degrade over time. Currently, eddy current dampers are widely used in vibration isolation of suspension systems, structural vibration reduction of bridges and buildings, and recoil braking of weapon systems. In addition, because eddy current dampers adopt an all-metal structure, they have advantages such as good durability, high starting sensitivity, and low maintenance costs. Their service life can reach 50 years, and the amount of maintenance is relatively small. Therefore, eddy current dampers are a highly efficient vibration reduction device suitable for various scenarios that require vibration and impact control.

[0003] Elevator buffers are currently mainly divided into two categories. One type is the energy-storing buffer: mainly spring buffers, which are made of helical springs made of steel wire. They absorb the impact energy of the car or counterweight through the deformation of the spring. The advantages of this type of buffer are its simple structure, low price, and convenient maintenance. The disadvantage is that it can only be used in low-speed elevators with a rated speed of no more than 1.0 m / s, because the rebound effect of the spring will cause secondary impact on passengers and equipment. In addition, the buffer stroke is relatively long, requiring a large pit depth. The other type is the energy-dissipating buffer: mainly hydraulic buffers, which are composed of oil cylinders, plungers, return springs, etc. They dissipate the impact energy of the car or counterweight through the flow and compression of hydraulic oil. The advantages of this type of buffer are that it is suitable for elevators of any speed, the buffering process is smooth and continuous, there is no rebound effect, the buffer stroke is short, and it saves pit space. The disadvantages are that it has a complex structure, a higher price, and requires regular replacement of hydraulic oil and inspection of the oil cylinder's sealing.

[0004] Based on the advantages and disadvantages of the above two types of buffers, an eddy current damping energy dissipation type elevator buffer is proposed. The eddy current damping energy dissipation type elevator buffer is a new type of buffer that combines an eddy current damper and a spring buffer. Summary of the Invention

[0005] The technical problem to be solved by this invention is to address the issues of poor speed adaptability, poor rebound effect, excessive pit space occupation, and high maintenance costs of most existing elevator buffers. In order to overcome the above-mentioned problems, an eddy current damping energy-dissipating elevator buffer is provided, which solves the above-mentioned problems.

[0006] The technical problem solved by this invention is achieved through the following technical solution:

[0007] An eddy current damping energy-dissipating elevator buffer includes an outer buffer tube and an installation chamber within the outer buffer tube. The installation chamber contains a piston rod that slides vertically and horizontally. The piston rod has a stator assembly and a mover assembly on its exterior. The stator assembly includes an inner buffer tube for guiding and protecting the piston rod. A non-magnetic magnetic guide cylinder is located on the lower side of the inner buffer tube, with its bottom open. An air intake gap is formed between the non-magnetic magnetic guide cylinder and the side wall of the installation chamber. An insulating friction coating is uniformly coated on the inner wall of the non-magnetic magnetic guide cylinder. The mover assembly includes a permanent magnet sleeve disposed on the outer periphery of the piston rod's bottom for generating eddy currents. A certain gap is formed between the permanent magnet sleeve and the insulating friction coating. A reset element for sliding the piston rod back to its original position is also provided at the bottom of the piston rod. A protective element for protecting the piston rod is also provided between the outer periphery of the piston rod and the installation chamber.

[0008] Preferably, the reset component includes a reset spring disposed between the piston rod and the mounting chamber, with one end of the reset spring disposed at the bottom of the piston rod and the other end disposed on the bottom wall of the mounting chamber.

[0009] Preferably, the mounting chamber is located directly below the piston rod and is further provided with a buffer pad for protecting the piston rod, the buffer pad being located inside the return spring.

[0010] Preferably, the protective component includes a dustproof gasket disposed on the outer periphery of the piston rod, and the dustproof gasket is installed at the top opening of the mounting chamber.

[0011] Preferably, the lower side of the dustproof gasket is provided with an oil seal plug for protecting the piston rod.

[0012] Preferably, the material of the non-magnetic magnetic cylinder is a copper tube.

[0013] Preferably, the bottom of the outer tube of the buffer is provided with a plurality of air inlet holes that communicate with the air inlet gap.

[0014] Preferably, the piston rod is sleeved inside the inner tube of the buffer, and a bearing for horizontal rotation of the inner tube of the buffer is installed on the outer circumferential surface of the inner tube of the buffer, and the outer side of the bearing is located on the inner wall of the mounting chamber.

[0015] Preferably, the outer periphery of the inner tube of the buffer is further provided with a pressure-accumulating sponge for protecting the inner tube of the buffer.

[0016] The advantages and positive effects of this invention are as follows: The fixed / moving component achieves the effect of a novel buffer, applicable to elevators at any speed. Its damping force increases with speed, thus enhancing the buffering effect. Eddy current damping characteristics enable a rebound-free buffering process. The eddy current damping force moves in the opposite direction to the moving component, preventing the moving component from rising again. Furthermore, the eddy current damping force itself is a dissipative damping force, preventing the generation of reaction force and achieving a smooth buffering process. The reset component ensures smooth buffer movement and provides a post-movement reset effect. Simultaneously, the buffer stroke is short, and the pit depth is shallow, saving installation space. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a schematic diagram of the structure of the present invention;

[0019] Figure 2 yes Figure 1 Schematic diagram of the structure of AA;

[0020] Figure 3 yes Figure 2 A magnified structural diagram of B in the diagram;

[0021] Figure 4 yes Figure 2 A magnified structural diagram of C;

[0022] Figure 5 This is a diagram illustrating the effect of eddy current resistance.

[0023] The markings in the attached diagram are described below:

[0024] 1. Stator assembly; 11. Buffer outer tube; 111. Mounting chamber; 112. Air inlet; 1121. Air inlet gap; 12. Non-magnetic magnetic guide tube; 121. Insulator friction coating; 13. Permanent magnet sleeve; 14. Buffer inner tube;

[0025] 2. Moving part assembly; 21. Piston rod; 211. Protective sleeve; 22. Return spring;

[0026] 3. Protective components; 31. Dustproof gaskets; 32. Oil seal plugs; 33. Bearings; 34. Pressure accumulator sponges;

[0027] 4. Reset component; 41. Buffer pad; 42. Reset spring. Detailed Implementation

[0028] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention. The embodiments of the invention are further described in detail below with reference to the accompanying drawings:

[0029] Reference Figure 1 and Figure 2 As shown, most existing energy-storing buffers primarily use spring buffers, while energy-dissipating buffers mainly use hydraulic buffers. Both types of buffers have their own advantages and disadvantages, but both also have limitations. For example, spring buffers are only suitable for low-speed elevators with a rated speed not exceeding 1.0 m / s because the spring's rebound effect and long buffer stroke limit their application range. While hydraulic buffers are suitable for elevators of various speeds, they are complex in structure, expensive, and require regular hydraulic oil replacement and cylinder sealing checks, resulting in high maintenance costs. To address these issues, this embodiment... An eddy current damping energy-dissipating elevator buffer is proposed, comprising an outer buffer tube 11 and an installation chamber 111 formed within the outer buffer tube 11. The installation chamber 111 contains a piston rod 21 that slides vertically and horizontally. A stator assembly 1 and a mover assembly are provided outside the piston rod 21. The stator assembly 1 includes an inner buffer tube 14 for guiding and protecting the piston rod 21. A non-magnetic magnetic guide cylinder 12 is provided on the lower side of the inner buffer tube 14, with its bottom open. The non-magnetic magnetic guide cylinder 12 is connected to the installation chamber 111. An air intake gap 1121 is formed between the side walls. An insulating friction coating 121 is uniformly coated on the inner wall of the non-magnetic magnetic cylinder 12. The moving part assembly includes a permanent magnet sleeve 13 disposed on the outer periphery of the bottom of the piston rod 21 for generating eddy currents. A certain gap is formed between the permanent magnet sleeve 13 and the insulating friction coating 121. A reset member 4 is also provided at the bottom of the piston rod 21 for sliding and resetting the piston rod 21. A protective member 3 for protecting the piston rod 21 is also provided between the outer periphery of the piston rod 21 and the mounting chamber 111. The moving part assembly is connected to the stator assembly 1 and the moving part assembly 21. The sub-component 2 is designed to meet the requirements of a new type of buffer, which is applicable to elevators at any speed. Its damping force increases with speed, thereby improving the buffering effect. The reset component 4 enables a buffering process without rebound. The eddy current formed by the interaction between the insulating friction coating 121 and the permanent magnet sleeve 13 is opposite to the direction of movement of the moving sub-component 2, eliminating the upward force and spring reset force, and preventing the moving sub-component 2 from rebounding again. At the same time, the buffer stroke is short and the pit depth is shallow, thus saving installation space.

[0030] It should be noted that, referring to Figure 2 and Figure 5As shown, the above-mentioned damping energy dissipation process is as follows: When the moving part 2 is subjected to an impact, the magnetic cylinder generates an Ampere force that contracts toward the center of its cross-section due to Lenz's law, and the magnetic cylinder and permanent magnet sleeve 13 expand due to heat. At this time, the insulating friction coating 121 will come into frictional contact with the permanent magnet sleeve 13, thereby causing the buffer to exhibit a friction damping energy dissipation mechanism. The triggering of the friction damping energy dissipation mechanism and the magnitude of the friction force when the buffer is subjected to an impact can be controlled by adjusting the gap between the non-magnetic magnetic cylinder 12 and the permanent magnet sleeve.

[0031] It should also be noted that, regarding the nonlinear characteristics exhibited by eddy current damping, scholars have proposed different mathematical models to describe the relationship between eddy current damping force and velocity. Among them, Wouterse's model is widely accepted due to its clear physical meaning, and the formula is as follows:

[0032] In the above formula: Fw is the axial eddy current damping force, v is the velocity, Fmax is the peak value of the eddy current damping force, and vcr is the critical velocity corresponding to the peak value of the eddy current damping force. The parameters Fw and vcr can be obtained through experiments or finite element simulation.

[0033] When the elevator malfunctions or overspeeds, the car or counterweight will strike the top of the buffer, compressing the mover downwards. During its descent, the mover cuts the magnetic field generated by the stator, thereby inducing eddy currents in the stator. These eddy currents generate a damping force opposite to the direction of the mover's motion, reducing the mover's descent speed. At the same time, the mover's kinetic energy is dissipated by the eddy currents, the spring, and any friction. When the mover descends to a certain position, its speed stabilizes, the system reaches dynamic equilibrium, and it finally stabilizes on the buffer pad 41 below. Then, the car or counterweight is lifted to reset the buffer. The reset spring 42 pushes the mover to reset, generating an eddy current damping force opposite to that during the movement, making the reset process smooth.

[0034] The reset process of the aforementioned buffer is performed by the reset component 4. The specific structure of the reset component 4 is as follows: the reset component 4 includes a reset spring 42 disposed between the piston rod 21 and the mounting chamber 111. One end of the reset spring 42 is disposed at the bottom of the piston rod 21, and the other end is disposed on the bottom wall of the mounting chamber 111. By setting the reset spring 42, the rebound force accumulated by the reset spring 42 can drive the piston rod 21 to slide upward and reset after the impact disappears.

[0035] Furthermore, in order to prevent excessive impact force from causing the piston rod 21 to directly contact the inner part of the outer tube of the buffer and to prevent damage to the piston rod 21, in this embodiment, the mounting chamber 111 is located directly below the piston rod 21 and is also provided with a buffer pad 41 for protecting the piston rod 21. The buffer pad 41 is located inside the return spring 42. The buffer pad 41 can effectively protect the bottom of the piston rod 21.

[0036] It is also important to note that, referring to Figure 1 and Figure 2 As shown, since the elevator makes contact with the top of the piston rod 21 during the downward impact process, a protective sleeve 211 is also provided on the top of the piston rod 21 in this embodiment to protect the piston rod 21.

[0037] Additionally, refer to Figure 3 and Figure 4 As shown, during the entire buffering process, since the stroke space of the piston rod 21 in the installation chamber 111 is relatively sealed, the air will inevitably be compressed after the piston rod 21 is impacted. In order to ensure that the entire buffering process can proceed normally, the above requirements are achieved by setting the air intake gap 1121 in this embodiment. Furthermore, the bottom of the buffer outer tube 11 is provided with several air intake holes 112 that communicate with the air intake gap 1121. By setting several air intake holes 112, it is possible to ensure that after the buffering is completed, external air can enter the air intake gap 1121 along the air intake holes 112, and external air can also smoothly fill the low-pressure space generated during the reset process.

[0038] It is worth mentioning that the magnitude of the eddy current damping generated by the material used in the non-magnetic magnetic cylinder 12 is highly correlated with its material composition. In this embodiment, copper tubes are selected to make the non-magnetic magnetic cylinder 12. In addition to copper tubes, aluminum tubes or iron tubes can also be selected, but the performance will be further reduced.

[0039] Reference Figures 1 to 5 As shown, the specific structure of the above-mentioned protective component 3 is as follows: the protective component 3 includes a dustproof gasket 31 disposed on the outer periphery of the piston rod 21, and the dustproof gasket 31 is installed at the top opening of the mounting chamber 111; the dustproof gasket 31 can ensure that the mounting chamber 111 and the moving part of the piston rod 21 can be effectively sealed to prevent external dust from entering and affecting the sliding of the piston rod 21.

[0040] In addition, the dustproof gasket 31 is provided with an oil seal plug 32 on the lower side for protecting the piston rod 21; the oil seal plug 32 can achieve the purpose of isolating it from the outside air, ensuring better buffering effect of the buffer.

[0041] It should be noted that, in order to ensure more stable sliding of the piston rod 21 within the buffer, in this embodiment, the piston rod 21 is sleeved inside the inner tube 14 of the buffer, and a bearing 33 for horizontal rotation of the inner tube 14 is installed on the outer circumferential surface of the inner tube 14. The outer side of the bearing 33 is located on the inner wall of the mounting chamber 111. The bearing 33 is mainly used to support, guide, and center the piston rod 21, enabling it to slide smoothly within the inner tube 14 of the buffer. Furthermore, the material and precision of the bearing 33 will affect the performance and lifespan of the buffer.

[0042] Furthermore, in order to protect the inner tube 14 of the buffer, a pressure-accumulating sponge 34 is provided on the outer periphery of the inner tube 14 for protecting the inner tube 14; the setting of the pressure-accumulating sponge 34 can achieve the safety protection of the inner tube 14 of the buffer, ensuring its life and protection against external impact forces during operation.

[0043] It should also be noted that a mounting base is provided at the bottom of the outer tube 11 of the buffer to facilitate better installation of the buffer.

[0044] It should be emphasized that the embodiments described in this invention are illustrative rather than limiting. Therefore, this invention is not limited to the embodiments described in the specific implementation. Any other implementation methods derived by those skilled in the art based on the technical solutions of this invention also fall within the scope of protection of this invention.

Claims

1. An eddy current damping energy dissipation type elevator buffer, comprising a buffer outer tube (11) and a mounting chamber (111) opened in the buffer outer tube (11), characterized in that: The mounting chamber (111) contains a piston rod (21) that slides vertically and horizontally. A stator assembly (1) and a mover assembly (2) are located outside the piston rod (21). The stator assembly (1) includes a buffer inner tube (14) for guiding and protecting the piston rod (21). A non-magnetic magnetic guide cylinder (12) is located on the lower side of the buffer inner tube (14). The bottom of the non-magnetic magnetic guide cylinder (12) is open, and an air inlet gap (1121) is formed between the non-magnetic magnetic guide cylinder (12) and the side wall of the mounting chamber (111). The inner wall of the magnetic cylinder (12) is uniformly coated with an insulating friction coating (121). The moving part assembly (2) includes a permanent magnet sleeve (13) disposed on the outer periphery of the bottom of the piston rod (21) for generating eddy currents. A certain gap is formed between the permanent magnet sleeve (13) and the insulating friction coating (121). The bottom of the piston rod (21) is also provided with a reset member (4) for sliding and resetting the piston rod (21). A protective member (3) for protecting the piston rod (21) is also provided between the outer periphery of the piston rod (21) and the mounting chamber (111). When the moving component (2) is subjected to an impact, the non-magnetic magnetic cylinder (12) generates an Ampere force that contracts toward the center of its cross-section due to Lenz's law, and the non-magnetic magnetic cylinder (12) and the permanent magnet sleeve (13) expand due to heat. At this time, the insulating friction coating (121) will come into frictional contact with the permanent magnet sleeve (13), thereby causing the buffer to exhibit a friction damping energy dissipation mechanism. The friction damping energy dissipation mechanism and the magnitude of the friction force triggered by the buffer when subjected to an impact can be controlled by adjusting the gap between the non-magnetic magnetic cylinder (12) and the permanent magnet sleeve (13).

2. An eddy current damping energy dissipating elevator buffer according to claim 1, characterized in that The reset component (4) includes a reset spring (42) disposed between the piston rod (21) and the mounting chamber (111). One end of the reset spring (42) is disposed at the bottom of the piston rod (21), and the other end is disposed on the bottom wall of the mounting chamber (111).

3. An eddy current damping energy dissipating elevator buffer according to claim 2, characterized in that The mounting chamber (111) is located directly below the piston rod (21) and is also provided with a buffer pad (41) for protecting the piston rod (21). The buffer pad (41) is located inside the return spring (42).

4. An eddy current damping energy dissipating elevator buffer according to claim 1, characterized in that: The protective component (3) includes a dustproof gasket (31) disposed on the outer periphery of the piston rod (21), and the dustproof gasket (31) is installed at the top opening of the mounting chamber (111).

5. The eddy current damping energy-dissipating elevator buffer according to claim 4, characterized in that: The dustproof gasket (31) has an oil seal plug (32) on its lower side for protecting the piston rod (21).

6. The eddy current damping energy-dissipating elevator buffer according to claim 1, characterized in that: The material of the non-magnetic magnetic tube (12) is copper tube.

7. The eddy current damping energy-dissipating elevator buffer according to claim 1, characterized in that: The bottom of the buffer outer tube (11) is provided with a plurality of air inlet holes (112) that are connected to the air inlet gap (1121).

8. The eddy current damping energy-dissipating elevator buffer according to claim 1, characterized in that: The piston rod (21) is sleeved inside the inner tube (14) of the buffer, and a bearing (33) for horizontal rotation of the inner tube (14) is installed on the outer circumferential surface of the inner tube (14). The outer side of the bearing (33) is located on the inner wall of the mounting chamber (111).

9. The eddy current damping energy-dissipating elevator buffer according to claim 1, characterized in that: The outer periphery of the inner tube (14) of the buffer is also provided with a pressure-accumulating sponge (34) for protecting the inner tube (14).

Images