CN114838081B - Two-chamber long-stroke magnetorheological fluid damper capable of saving magnetorheological fluid - Google Patents

Two-chamber long-stroke magnetorheological fluid damper capable of saving magnetorheological fluid Download PDF

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Publication number
CN114838081B
CN114838081B CN202210608207.1A CN202210608207A CN114838081B CN 114838081 B CN114838081 B CN 114838081B CN 202210608207 A CN202210608207 A CN 202210608207A CN 114838081 B CN114838081 B CN 114838081B
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China
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cylinder body
chamber
magnetorheological fluid
cavity
piston
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CN114838081A (en
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刘嘉
叶艳秋
王佳庆
涂建维
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Wuhan University of Technology WUT
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Wuhan University of Technology WUT
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/53—Means for adjusting damping characteristics by varying fluid viscosity, e.g. electromagnetically
    • F16F9/535—Magnetorheological [MR] fluid dampers
    • F16F9/537—Magnetorheological [MR] fluid dampers specially adapted valves therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/10—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using liquid only; using a fluid of which the nature is immaterial
    • F16F9/14—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect
    • F16F9/16—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect involving only straight-line movement of the effective parts
    • F16F9/18—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect involving only straight-line movement of the effective parts with a closed cylinder and a piston separating two or more working spaces therein
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/3207—Constructional features
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/3207—Constructional features
    • F16F9/3214—Constructional features of pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/34—Special valve constructions; Shape or construction of throttling passages
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/43—Filling or drainage arrangements, e.g. for supply of gas

Abstract

The application relates to a two-chamber long-stroke magnetorheological fluid damper capable of saving magnetorheological fluid, which comprises an outer cylinder body, an inner cylinder body and a piston assembly, wherein the outer cylinder body is provided with a plurality of grooves; the outer cylinder body is provided with a first containing cavity; the inner cylinder body is movably arranged in the first containing cavity along the axial direction of the outer cylinder body, a communication channel is arranged between the first cavity and the second cavity, a first communication valve is arranged on the communication channel, and the inner cylinder body is provided with a second containing cavity; the piston assembly comprises a piston and a movable shaft, the piston is provided with an electromagnetic coil and is movably arranged in the second containing cavity along the axial direction of the outer cylinder body, a damping channel is arranged between the third cavity and the fourth cavity, a second communication valve is arranged on the damping channel, and the movable shaft is arranged along the axial direction of the outer cylinder body in an extending manner; the first chamber and the second chamber are internally provided with hydraulic oil, and the third chamber and the fourth chamber are internally provided with magnetorheological fluid. The scheme is suitable for temperature load and external load, and simultaneously can adopt low-cost hydraulic oil, so that the consumption of magnetorheological fluid is reduced, and the cost is greatly reduced.

Description

Two-chamber long-stroke magnetorheological fluid damper capable of saving magnetorheological fluid
Technical Field
The application relates to the technical field of magnetorheological fluid dampers, in particular to a two-chamber long-stroke magnetorheological fluid damper capable of saving magnetorheological fluid.
Background
The magnetorheological fluid damper is a controllable intelligent fluid damper with excellent performance, has the advantages of adjustable parameters and damping force, large output, simple structure and the like, can quickly change the mechanical properties of the magnetorheological fluid by adjusting the magnetic field strength, and is very suitable for vibration control of large civil engineering structures such as large-span bridges and the like.
For example, patent CN 102654167B discloses a magnetorheological damper capable of preventing precipitation of a magnetorheological fluid, which achieves vibration absorption by cooperation of the magnetorheological fluid and a piston. However, in the environment with larger day-night temperature difference, the displacement between bridge nodes of the large-span flexible bridge (suspension bridge, cable-stayed bridge and the like) is large, tens of centimeters less and 1-2 meters more under the action of temperature. The temperature-induced increase in the magnetorheological fluid damper is provided only to accommodate the shrinkage displacement caused by temperature, and is not provided to cope with external loads (earthquake, wind load, vehicle load, etc.). Thus, this stroke may be considered an ineffective stroke of the magnetorheological fluid damper. In order to adapt to the change of displacement between nodes caused by temperature action, the stroke of the magnetorheological fluid damper is correspondingly increased, so that the volume of the needed magnetorheological fluid is increased, the price of the magnetorheological fluid is very high, and the cost is greatly increased even if the domestic magnetorheological fluid is thousands of yuan per liter.
Disclosure of Invention
In view of the foregoing, it is necessary to provide a two-chamber long-stroke magnetorheological fluid damper capable of saving magnetorheological fluid, so as to solve the technical problem that the magnetorheological fluid damper in the prior art increases the stroke to cope with the temperature load, resulting in a substantial increase in cost.
The application provides a two-chamber long-stroke magnetorheological fluid damper capable of saving magnetorheological fluid, which comprises:
an outer cylinder body having a first cavity;
the inner cylinder body is movably arranged in the first containing cavity along the axial direction of the outer cylinder body and is used for separating the first containing cavity into a first cavity and a second cavity along the axial direction of the outer cylinder body, a communication channel is arranged between the first cavity and the second cavity, a first communication valve is arranged on the communication channel, and the inner cylinder body is provided with a second containing cavity; the method comprises the steps of,
the piston assembly comprises a piston and a movable shaft, one end of the movable shaft is connected with the piston, the piston is provided with an electromagnetic coil, the movable shaft is movably arranged in the second containing cavity along the axial direction of the outer cylinder body and is used for separating the second containing cavity into a third cavity and a fourth cavity along the axial direction of the outer cylinder body, a damping channel is arranged between the third cavity and the fourth cavity, a second communication valve is arranged on the damping channel, the movable shaft extends along the axial direction of the outer cylinder body, and one end far away from the piston extends out of the outer cylinder body from the second containing cavity;
the first chamber and the second chamber are internally provided with hydraulic oil, and the third chamber and the fourth chamber are internally provided with magnetorheological fluid.
Optionally, a gap is left between the outer periphery of the piston and the inner wall of the inner cylinder along the axial direction of the outer cylinder to form the damping channel.
Optionally, the second communication valve includes:
one side of the mounting seat is connected with one end of the piston in the axial direction; the method comprises the steps of,
the baffle is movably arranged on the periphery of the mounting seat along the radial direction of the inner cylinder body so as to have a movable stroke close to and far away from the mounting seat, the damping channel is communicated with the third chamber and the fourth chamber when the baffle is close to the mounting seat, and the baffle is used for isolating the damping channel when the baffle is far away from the mounting seat.
Optionally, an installation groove is concavely formed in the periphery of the installation seat along the radial direction, a fixed iron core is arranged at the bottom of the installation groove, and a spring is arranged between the bottom of the installation groove and the baffle plate;
the second communication valve further comprises a movable iron core arranged on one side of the baffle close to the mounting seat, and a metal coil is wound on the periphery of the movable iron core, so that the baffle moves towards the direction close to the mounting seat when the metal coil is electrified.
Optionally, the piston and the inner wall of the inner cylinder body are arranged at intervals along the radial direction so as to form the damping channel;
the baffle is provided with a plurality of baffles along the circumference of the installation seat at intervals.
Optionally, the piston comprises a piston body and a cover body which are sequentially arranged along the axial direction of the outer cylinder body, an accommodating cavity is formed between the piston body and the cover body in a matched mode, and an avoidance port communicated with the damping channel is formed in the inner wall of the accommodating cavity;
the second communication valve is arranged in the accommodating cavity, and the baffle plate can extend out of the damping channel from the avoidance port so as to isolate the damping channel.
Optionally, a second communication valve is respectively disposed on a side of the piston body opposite to the cover body.
Optionally, the outer cylinder body is provided with a first opening communicated with the first chamber and a second opening communicated with the second chamber, the first opening and the second opening are communicated through an external pipeline, and the external pipeline is positioned outside the first containing chamber;
the communication channel is the external pipeline.
Optionally, the first communication valve is a normally closed electromagnetic valve arranged on the external pipeline.
Optionally, a fixed shaft is arranged on one side of the outer cylinder body opposite to the movable shaft; and/or the number of the groups of groups,
an auxiliary shaft is arranged on one side of the piston, which is opposite to the movable shaft, and extends along the axial direction of the outer cylinder body and extends out of the outer cylinder body from the second containing cavity; and/or the number of the groups of groups,
the hydraulic oil is silicone oil.
Compared with the prior art, the two-chamber long-stroke magnetorheological fluid damper capable of saving the magnetorheological fluid has the advantages that when the two-chamber long-stroke magnetorheological fluid damper is used for coping with temperature loads, the first communication valve is controlled to be opened so that the first chamber is communicated with the second chamber, and the second communication valve is controlled to be closed so that the third chamber is not communicated with the fourth chamber. When the bridge node displacement caused by temperature load is handled, the piston can not move because the third chamber is not communicated with the fourth chamber; and because the first cavity is communicated with the second cavity, the inner cylinder body can move along the axial direction of the outer cylinder body so as to take the inner cylinder body as a piston of the outer cylinder body, and the function of resisting bridge node displacement is achieved.
When the external load is handled, the first communication valve is controlled to be closed so that the first chamber is not communicated with the second chamber; and controls the second communication valve to open so that the third chamber communicates with the fourth chamber. At this time, since the first chamber and the second chamber are not communicated, the inner cylinder body and the outer cylinder body are relatively stationary, that is, the inner cylinder body cannot move in the axial direction of the outer cylinder body. Meanwhile, the third chamber is communicated with the fourth chamber, so that the piston can move in the inner cylinder body along the axial direction, and the piston provided with the electromagnetic coil is matched with magnetorheological fluid to realize energy dissipation of external load. Therefore, the two-chamber long-stroke magnetorheological fluid damper capable of saving magnetorheological fluid can adopt low-cost hydraulic oil when being suitable for two conditions of temperature load and external load, and the consumption of magnetorheological fluid is reduced, so that the cost is greatly reduced.
The foregoing description is only an overview of the present application, and is intended to provide a better understanding of the present application, as it is embodied in the following description, with reference to the preferred embodiments of the present application and its details set forth in the accompanying drawings. Specific embodiments of the present application are given in detail by the following examples and the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:
FIG. 1 is a schematic diagram of an embodiment of a two-chamber long-stroke magnetorheological fluid damper for saving magnetorheological fluid according to the present application;
FIG. 2 is an enlarged schematic view of FIG. 1 at A;
FIG. 3 is a flow chart of operation of the two-chamber long-stroke magnetorheological fluid damper of FIG. 1 saving magnetorheological fluid;
FIG. 4 is a schematic cross-sectional view of the second communication valve (baffle in a position near the mounting seat) and the inner and outer cylinders of FIG. 1
FIG. 5 is a schematic view of the baffle in a position away from the mount;
reference numerals illustrate:
100-two-chamber long-stroke magnetorheological fluid damper saving magnetorheological fluid, 1-outer cylinder, 1 a-first containing cavity, 1a 1-first chamber, 1a 2-second chamber, 1 b-first opening, 1 c-second opening, 11-fixed shaft, 2-inner cylinder, 2 a-second containing cavity, 2a 1-third chamber, 2a 2-fourth chamber, 2 b-damping channel, 3-piston assembly, 31-piston, 311-piston body, 312-cover, 32-movable shaft, 33-electromagnetic coil, 34-auxiliary shaft, 4-first communicating valve, 5-second communicating valve, 51-mount, 511-threaded hole, 51 a-mounting groove, 52-baffle, 53-fixed core, 54-movable core, 55-spring, 56-metal coil, 6-external pipeline, 6 a-communicating channel.
Detailed Description
The following detailed description of preferred embodiments of the application is made in connection with the accompanying drawings, which form a part hereof, and together with the description of the embodiments of the application, are used to explain the principles of the application and are not intended to limit the scope of the application.
Referring to fig. 1 and 2, the two-chamber long-stroke magnetorheological fluid damper 100 for saving magnetorheological fluid includes an outer cylinder 1, an inner cylinder 2 and a piston assembly 3; the outer cylinder 1 has a first chamber 1a; the inner cylinder body 2 is movably arranged in the first containing cavity 1a along the axial direction of the outer cylinder body 1, and is used for separating the first containing cavity 1a into a first cavity 1a1 and a second cavity 1a2 along the axial direction of the outer cylinder body 1, a communication channel 6a is arranged between the first cavity 1a1 and the second cavity 1a2, a first communication valve 4 is arranged on the communication channel 6a, and the inner cylinder body 2 is provided with a second containing cavity 2a; the piston assembly 3 comprises a piston 31 and a movable shaft 32 with one end connected to the piston 31, the piston 31 is provided with an electromagnetic coil 33, and the movable shaft is movably arranged in a second containing cavity 2a along the axial direction of the outer cylinder body 1, so that the second containing cavity 2a is divided into a third cavity 2a1 and a fourth cavity 2a2 along the axial direction of the outer cylinder body 1, a damping channel 2b is arranged between the third cavity 2a1 and the fourth cavity 2a2, a second communication valve 5 is arranged on the damping channel 2b, the movable shaft 32 extends along the axial direction of the outer cylinder body 1, and one end far away from the piston 31 extends out of the outer cylinder body 1 from the second containing cavity 2a; the first chamber 1a1 and the second chamber 1a2 are internally provided with hydraulic oil, and the third chamber 2a1 and the fourth chamber 2a2 are internally provided with magnetorheological fluid.
The two-chamber long-stroke magnetorheological fluid damper 100 for saving magnetorheological fluid provided by the application controls the first communication valve 4 to be opened so as to enable the first chamber 1a1 to be communicated with the second chamber 1a2 and controls the second communication valve 5 to be closed so as to enable the third chamber 2a1 to be not communicated with the fourth chamber 2a2 when the two-chamber long-stroke magnetorheological fluid damper is used for coping with temperature load. So that the piston 31 is not movable due to the non-communication between the third chamber 2a1 and the fourth chamber 2a2 when the bridge node displacement caused by the temperature load is handled; and because the first chamber 1a1 is communicated with the second chamber 1a2, the inner cylinder body 2 can move along the axial direction of the outer cylinder body 1, so that the inner cylinder body 2 is used as a piston of the outer cylinder body 1 to play a role in resisting bridge node displacement. And when the external load is handled, the first communication valve 4 is controlled to be closed so that the first chamber 1a1 and the second chamber 1a2 are not communicated; and controls the second communication valve 5 to open so that the third chamber 2a1 communicates with the fourth chamber 2a 2. At this time, since the first chamber 1a1 and the second chamber 1a2 are not communicated, the inner cylinder 2 and the outer cylinder 1 are relatively stationary, that is, the inner cylinder 2 cannot move in the axial direction of the outer cylinder 1. Meanwhile, as the third chamber 2a1 is communicated with the fourth chamber 2a2, the piston 31 can move in the inner cylinder body 2 along the axial direction, and the piston 31 provided with the electromagnetic coil 33 is matched with magnetorheological fluid, so that energy dissipation of external load is realized. Therefore, the two-chamber long-stroke magnetorheological fluid damper 100 capable of saving magnetorheological fluid provided by the scheme can be suitable for both temperature load and external load, and meanwhile, low-cost hydraulic oil can be adopted, so that the consumption of magnetorheological fluid is reduced, and the cost is greatly reduced. Specifically, in one embodiment, the hydraulic oil is silicone oil.
It should be noted that, referring to fig. 3, the two-chamber long-stroke magnetorheological fluid damper 100 for saving magnetorheological fluid according to the present application is electrically connected to a control system, and the control system is also electrically connected to a collector and a sensor sequentially. The workflow diagram is specifically as follows: the two-chamber long-stroke magnetorheological fluid damper 100 for saving magnetorheological fluid is arranged at the bridge tower, and the sensor is arranged at the midspan part of the bridge. The sensor detects the bridge motion state and transmits the bridge motion state to the collector, the collector transmits data to the control system, and the control system controls the two single-pole double-throw switches to switch the two working modes of the application, wherein one of the two single-pole double-throw switches is used for controlling the opening and closing of the first communication valve 4, and the other is used for controlling the opening and closing of the second communication valve 5.
Further, a gap is left between the outer periphery of the piston 31 and the inner wall of the inner cylinder 2 in the axial direction of the outer cylinder 1 to form a damping passage 2b. According to the scheme, through the gap between the periphery of the piston 31 and the inner wall of the inner cylinder body 2, the communication between the third chamber 2a1 and the fourth chamber 2a2 is realized, so that the damage to the integrity of the inner cylinder body 2 or the piston 31 caused by the hole channel on the inner cylinder body 2 or the piston 31 is avoided, and the strength of the inner cylinder body 2 and the piston 31 is ensured.
Further, referring to fig. 4 and 5, the second communication valve 5 includes a mounting seat 51 and a baffle 52; one side of the mounting seat 51 is connected to one end of the piston 31 in the axial direction; the baffle plate 52 is movably arranged on the outer periphery of the mounting seat 51 along the radial direction of the inner cylinder body 2 so as to have a movable stroke approaching and separating from the mounting seat 51, when the baffle plate 52 approaches the mounting seat 51, the damping channel 2b is communicated with the third chamber 2a1 and the fourth chamber 2a2, and when the baffle plate 52 is separated from the mounting seat 51, the baffle plate 52 cuts off the damping channel 2b. The present embodiment realizes opening and closing of the damping passage 2b by the movement of the shutter 52, and has a simple structure. Meanwhile, the opening degree of the damping channel 2b can be easily controlled by controlling the movable stroke of the baffle plate 52, so as to control the flow rates of the magnetorheological fluid in the third chamber 2a1 and the fourth chamber 2a2, so that the application of the damper is more flexible. It will be appreciated that in this embodiment, the baffles 52 are arranged in an arc.
Specifically, an installation groove 51a is concavely formed in the outer periphery of the installation seat 51 in the radial direction, a fixed iron core 53 is arranged at the bottom of the installation groove 51a, and a spring 55 is arranged between the bottom of the installation groove 51a and the baffle plate 52; the second communication valve 5 further comprises a movable iron core 54 arranged on one side of the baffle plate 52 close to the mounting seat 51, and a metal coil 56 is wound on the periphery of the movable iron core 54, so that the baffle plate 52 moves towards the direction close to the mounting seat 51 when the metal coil 56 is electrified. The baffle plate 52 is controlled to move along the radial direction of the inner cylinder body 2 through the cooperation of the fixed iron core 53, the movable iron core 54 and the spring 55, and the structure is stable and reliable.
Further, in order to improve the flow efficiency of the magnetorheological fluid between the third chamber 2a1 and the fourth chamber 2a2, in the present embodiment, the piston 31 is disposed at a radial interval from the inner wall of the inner cylinder 2 to form a damping channel 2b; the baffle plates 52 are provided in plural at intervals along the circumferential direction of the mount 51. Thereby enabling the magnetorheological fluid to flow in the circumferential direction of the piston 31, and improving the flow efficiency of the magnetorheological fluid between the third chamber 2a1 and the fourth chamber 2a 2.
Further, in order to avoid the magnetorheological fluid from affecting the normal use of the second communication valve 5, in this embodiment, the piston 31 includes a piston body 311 and a cover 312 sequentially disposed along the axial direction of the outer cylinder 1, a receiving cavity is formed between the piston body 311 and the cover 312, and an avoidance port communicating with the damping channel 2b is formed in the inner wall of the receiving cavity; the second communication valve 5 is provided in the accommodation chamber, and the baffle plate 52 can protrude from the escape opening into the damping passage 2b to block the damping passage 2b. According to the scheme, the second communication valve 5 can be arranged in the accommodating cavity, so that the influence of magnetorheological fluid on the second communication valve 5 is reduced. In this embodiment, threaded holes 511 are respectively formed in the mounting seat 51, the piston body 311 and the cover 312, and the mounting seat 51 is respectively fixed to the piston body 311 or the cover 312 by sequentially penetrating corresponding threaded holes 511 through screw members.
Further, a second communication valve 5 is disposed on each side of the piston body 311 opposite to the cover 312. Specifically, in the present embodiment, two second communication valves 5 are each provided with two baffles 52, four baffles 52 are disposed at intervals along the circumferential direction of the inner cylinder 2, and projections of adjacent two baffles 52 on the mount 51 at least partially overlap. Correspondingly, two mounting grooves 51a of each mounting seat 51 are respectively provided, four mounting grooves 51a are arranged at intervals along the circumferential direction of the inner cylinder body 2, and in the embodiment, an included angle between two adjacent mounting grooves 51a is 90 °.
Further, in the present embodiment, the outer cylinder 1 is provided with a first opening 1b communicating with the first chamber 1a1 and a second opening 1c communicating with the second chamber 1a2, the first opening 1b and the second opening 1c are communicated through an external pipe 6, and the external pipe 6 is located outside the first accommodating chamber 1a; the communication channel 6a is an external pipeline 6. In this scheme, the communication channel 6a is disposed outside the first cavity 1a, so as to improve the space utilization rate of the first cavity 1 a. Specifically, the first communication valve 4 is a normally closed electromagnetic valve provided on the external pipe 6.
Further, in order to facilitate the installation of the two-chamber long-stroke magnetorheological fluid damper 100 for saving magnetorheological fluid, in the present embodiment, the side of the outer cylinder 1 opposite to the movable shaft 32 is provided with the fixed shaft 11. In addition, in order to make the volumes in the chambers relatively uniform under normal conditions, in the present embodiment, an auxiliary shaft 34 is provided on the side of the piston 31 opposite to the movable shaft 32, and the auxiliary shaft 34 is provided to extend in the axial direction of the outer cylinder 1 and to protrude from the second accommodation chamber 2a to the outside of the outer cylinder 1. Specifically, the movable shaft 32 and the auxiliary shaft 34 have the same diameter.
The present application is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present application are intended to be included in the scope of the present application.

Claims (7)

1. A two-chamber long-stroke magnetorheological fluid damper for conserving magnetorheological fluid, comprising:
an outer cylinder body having a first cavity;
the inner cylinder body is movably arranged in the first containing cavity along the axial direction of the outer cylinder body and is used for separating the first containing cavity into a first cavity and a second cavity along the axial direction of the outer cylinder body, a communication channel is arranged between the first cavity and the second cavity, a first communication valve is arranged on the communication channel, and the inner cylinder body is provided with a second containing cavity; the method comprises the steps of,
the piston assembly comprises a piston and a movable shaft, one end of the movable shaft is connected with the piston, the piston is provided with an electromagnetic coil, the movable shaft is movably arranged in the second containing cavity along the axial direction of the outer cylinder body and is used for separating the second containing cavity into a third cavity and a fourth cavity along the axial direction of the outer cylinder body, a damping channel is arranged between the third cavity and the fourth cavity, a second communication valve is arranged on the damping channel, the movable shaft extends along the axial direction of the outer cylinder body, and one end far away from the piston extends out of the outer cylinder body from the second containing cavity;
the first chamber and the second chamber are internally provided with hydraulic oil, and the third chamber and the fourth chamber are internally provided with magnetorheological fluid;
the first communication valve is opened when the temperature load is handled, the second communication valve is closed, and the first communication valve is closed and the second communication valve is opened when the external load is handled;
a gap is reserved between the periphery of the piston and the inner wall of the inner cylinder body along the axial direction of the outer cylinder body so as to form the damping channel;
the second communication valve includes:
one side of the mounting seat is connected with one end of the piston in the axial direction; the method comprises the steps of,
the baffle plate is movably arranged on the periphery of the mounting seat along the radial direction of the inner cylinder body so as to have a movable stroke close to and far away from the mounting seat, the damping channel is communicated with the third chamber and the fourth chamber when the baffle plate is close to the mounting seat, and the baffle plate cuts off the damping channel when the baffle plate is far away from the mounting seat;
the piston and the inner wall of the inner cylinder body are arranged at intervals along the radial direction so as to form the damping channel;
the baffle is provided with a plurality of baffles along the circumference of the installation seat at intervals.
2. The two-chamber long-stroke magnetorheological fluid damper for saving magnetorheological fluid according to claim 1, wherein the periphery of the mounting seat is provided with a mounting groove in a radially inward manner, the bottom of the mounting groove is provided with a fixed iron core, and a spring is arranged between the bottom of the mounting groove and the baffle plate;
the second communication valve further comprises a movable iron core arranged on one side of the baffle close to the mounting seat, and a metal coil is wound on the periphery of the movable iron core, so that the baffle moves towards the direction close to the mounting seat when the metal coil is electrified.
3. The two-chamber long-stroke magnetorheological fluid damper for saving magnetorheological fluid according to claim 1 or 2, wherein the piston comprises a piston body and a cover body which are sequentially arranged along the axial direction of the outer cylinder body, a containing cavity is formed between the piston body and the cover body in a matched manner, and an avoidance port communicated with the damping channel is formed in the inner wall of the containing cavity;
the second communication valve is arranged in the accommodating cavity, and the baffle plate can extend out of the damping channel from the avoidance port so as to isolate the damping channel.
4. A two-chamber long-stroke magnetorheological fluid damper for saving magnetorheological fluid according to claim 3, wherein the piston body is provided with a second communication valve on each side opposite to the cover.
5. The two-chamber long-stroke magnetorheological fluid damper for saving magnetorheological fluid according to claim 1, wherein the outer cylinder is provided with a first opening communicated with the first chamber and a second opening communicated with the second chamber, the first opening and the second opening are communicated through an external pipeline, and the external pipeline is positioned outside the first accommodating cavity;
the communication channel is the external pipeline.
6. The two-chamber long-stroke magnetorheological fluid damper of claim 5, wherein the first communication valve is a normally closed solenoid valve disposed in the external conduit.
7. The two-chamber long-stroke magnetorheological fluid damper for saving magnetorheological fluid according to claim 1, wherein the outer cylinder has a fixed shaft on a side opposite to the movable shaft; and/or the number of the groups of groups,
an auxiliary shaft is arranged on one side of the piston, which is opposite to the movable shaft, and extends along the axial direction of the outer cylinder body and extends out of the outer cylinder body from the second containing cavity; and/or the number of the groups of groups,
the hydraulic oil is silicone oil.
CN202210608207.1A 2022-05-31 2022-05-31 Two-chamber long-stroke magnetorheological fluid damper capable of saving magnetorheological fluid Active CN114838081B (en)

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CN1515809A (en) * 2003-01-02 2004-07-28 玲 邱 Electromagnetic rheopectic fluid piston component
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CN106122167A (en) * 2016-07-01 2016-11-16 江西科技学院 A kind of new type of valve control cylinder assembly using magnetic flow liquid
CN106594160A (en) * 2017-02-10 2017-04-26 哈尔滨工业大学 Foldable flowing magnetorheological damper with wide adjustable range
CN206600403U (en) * 2017-04-11 2017-10-31 华东交通大学 A kind of vehicle suspension Novel magneto-rheological damper for improving riding comfort
CN206802171U (en) * 2017-06-12 2017-12-26 华东交通大学 Using hydraulic oil and the bump leveller of magnetic flow liquid double work medium
CN208619581U (en) * 2018-07-23 2019-03-19 华东交通大学 A kind of vehicle suspension MR damper of integrated piezoelectric formula sensor
EP3771845A1 (en) * 2019-08-02 2021-02-03 BeijingWest Industries Co. Ltd. Magnetorheological hydraulic damper with passive damping chamber

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5404973A (en) * 1993-03-08 1995-04-11 Tokico Ltd. Damping force control type hydraulic shock absorber
CN1515809A (en) * 2003-01-02 2004-07-28 玲 邱 Electromagnetic rheopectic fluid piston component
CN201100358Y (en) * 2007-08-31 2008-08-13 中国南车集团株洲电力机车研究所 Damp varying oil pressure vibration reducer for engine car
CN101550981A (en) * 2008-03-31 2009-10-07 株式会社日立制作所 Damping force adjustment type buffer
CN106122167A (en) * 2016-07-01 2016-11-16 江西科技学院 A kind of new type of valve control cylinder assembly using magnetic flow liquid
CN106594160A (en) * 2017-02-10 2017-04-26 哈尔滨工业大学 Foldable flowing magnetorheological damper with wide adjustable range
CN206600403U (en) * 2017-04-11 2017-10-31 华东交通大学 A kind of vehicle suspension Novel magneto-rheological damper for improving riding comfort
CN206802171U (en) * 2017-06-12 2017-12-26 华东交通大学 Using hydraulic oil and the bump leveller of magnetic flow liquid double work medium
CN208619581U (en) * 2018-07-23 2019-03-19 华东交通大学 A kind of vehicle suspension MR damper of integrated piezoelectric formula sensor
EP3771845A1 (en) * 2019-08-02 2021-02-03 BeijingWest Industries Co. Ltd. Magnetorheological hydraulic damper with passive damping chamber

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