CN108180250A - A kind of built-in magnet valve improves the two-wire ring MR damper of damping capacity - Google Patents

Abstract

The invention discloses a double-coil magnetorheological damper with a built-in magnetic valve to improve damping performance, which mainly consists of a damper end cover, a damper cylinder body, a coil winding frame, an excitation coil, a valve body, a valve core, and a spring. , permanent magnets, and magnetic isolation cylinders. The annular gap between the coil bobbin and the damper cylinder forms the first liquid flow channel; the groove-shaped channel on the outer surface of the magnetic isolation cylinder and the circular through hole in the center of the valve body form the second liquid flow channel. The double-coil structure can adjust the output damping force in two stages, and can obtain a larger output damping force; the excitation coil at the rightmost end of the piston rod, the valve core, the permanent magnet, the valve body and the spring form the magnetic valve inside the damper. The normally open design of the valve enables the damper to obtain a small initial damping force. The combination of double-coil structure and built-in magnetic valve enables the damper to obtain a large output damping force and a wide adjustable range of damping force, which is especially suitable for various special and complex vibration reduction systems.

Description

A dual-coil magnetorheological damper with built-in magnetic valve to improve damping performance

technical field

The invention relates to a magnetorheological damper, in particular to a double-coil magnetorheological damper with a built-in magnetic valve to improve damping performance.

Background technique

The magnetorheological damper is a semi-active intelligent shock absorber made of the magnetorheological effect of magnetorheological fluid. Magnetorheological dampers have the advantages of large output damping force, continuous controllability and reversibility, and fast response speed. Therefore, it is widely used in various industrial vibration reduction fields, such as automobile suspension vibration reduction, housing construction vibration reduction, railway locomotive vibration reduction and heavy machinery vibration reduction, etc.

The traditional magneto-rheological damper winds a set of exciting coils on the built-in piston head, and passing current can generate magnetic lines of force perpendicular to the damping gap. The viscosity of the magnetorheological fluid changes under the action of a magnetic field, thereby generating an output damping force. Inputting different magnitudes of current can produce different magnitudes of output damping force.

The traditional single-coil magneto-rheological damper is widely used due to its simple structure, but due to structural limitations, it cannot generate a large output damping force. The emergence of the double-coil magneto-rheological damper effectively solves the problem of insufficient output damping force. However, due to the increase in the length of the damping gap, the initial damping force of the damper will also increase, so the adjustable range of the damper is greatly reduced. Small. Magneto-rheological dampers have further limited their industrial applications due to damping force and adjustable range. Therefore, it is urgent to design a magnetorheological damper with large output damping force and wide adjustable range to meet various working conditions.

Contents of the invention

In order to overcome the problems of the magneto-rheological damper described in the background technology and to meet the practical requirements of the magnetorheological damper, the present invention provides a double-coil magneto-rheological damper with a built-in magnetic valve to improve damping performance. The annular gap formed between the outer surface of the coil winding frame of the damper and the inner surface of the cylinder body of the damper constitutes the first liquid flow channel through which the magnetorheological fluid flows; the outer surface of the magnetic isolation cylinder is uniformly processed into four Groove, a circular through hole is machined in the center of the valve body. The slot-shaped channel on the outer surface of the magnetic isolation cylinder and the circular through hole in the center of the valve body constitute the second flow channel through which the magnetorheological fluid flows. The excitation coil Ⅰ and excitation coil Ⅱ are wound on the coil winding frame, which can form three damping gaps at the same time, which effectively increases the output damping force; The magnetic field lines of the coils cancel each other out, and the damper outputs a certain amount of damping force; when the excitation coil Ⅰ and the excitation coil Ⅱ are supplied with different directions of current, the magnetic force lines of the damping gap in the middle section of the coil are superimposed on each other, and the damper outputs a larger damping force; The coil structure enables the damper to adjust the damping force in two stages, and at the same time obtain a larger output damping force; the excitation coil III at the right end of the piston rod, the valve core, the permanent magnet at the left end of the valve core, the valve body and the spring form the inside of the damper magnetic valve. The ball at the rightmost end of the spool is on the same axis as the through hole of the valve body, and the spring between the spool and the magnetic isolation cylinder makes the second liquid flow channel in a normally open state, so that the damper can obtain a small initial damping force. The left end of the spool is inlaid with a permanent magnet, the left side of the permanent magnet is the N pole, and the right side is the S pole. Pass current to the excitation coil III at the rightmost end of the piston rod, and the excitation coil III generates an induced magnetic field with the S pole on the left and the N pole on the right. A repulsive force is generated between the excitation coil III and the permanent magnet of the spool, and then the spring is compressed to move the spool to the right, and the ball at the right end of the spool blocks the circular through hole in the center of the valve body. The greater the input current, the greater the displacement of the spool, and the greater the blocking degree of the through hole of the valve body. The built-in normally open magnetic valve can ensure that the initial damping force of the damper is a small value; the operation of the magnetic valve can close the second liquid flow channel, and the damper can obtain greater damping force, and finally increase the dynamic range of the damper ;The combination of double-coil structure and built-in magnetic valve makes the damper have a wider adjustable range of damping force while obtaining greater damping force. Compared with the magnetorheological damper of the traditional structure, the magnetorheological damper of the present invention has a larger output damping force and a wider adjustable range of damping force, superior damping performance, and is more suitable for various vibration reduction occasions .

The technical solution adopted by the present invention to solve the technical problem includes: left suspension ring (1), piston rod (2), damper left end cover (3), damper cylinder (4), coil winding frame (5), excitation Coil Ⅰ (6), excitation coil Ⅱ (7), right end cover of damper (8), right lifting ring (9), floating piston (10), valve body (11), spool (12), spring (13), The permanent magnet (14), the magnetic isolation cylinder (15) and the excitation coil III (16); the left lifting ring (1) and the piston rod (2) are fixedly connected by threads; the left end cover (3) of the damper is processed with a circular hole, the piston rod (2) is in clearance fit with the inner surface of the circular through hole of the left end cover of the damper (3), and is sealed by a sealing ring; the left end cover of the damper (3) is in clearance fit with the damper cylinder (4), and The sealing is performed by the sealing ring; the left end cover of the damper (3) is fixedly connected with the damper cylinder (4) by screws; the outer surface of the coil winding frame (5) and the inner surface of the damper cylinder (4) are formed The ring gap constitutes the first liquid flow channel through which the magnetorheological fluid flows; the outer surface of the magnetic isolation cylinder (15) is evenly processed with four grooves, and the center of the valve body (11) is processed with a circular through hole; The groove-shaped channel on the outer surface of the magnetic isolation cylinder (15) and the circular through hole in the center of the valve body (11) constitute the second liquid flow channel through which the magnetorheological fluid flows; the inner surface of the magnetic isolation cylinder (15) and the The outer surface of the right end of the piston rod (2) is interference fit; the right end of the piston rod (2) is processed with an annular groove, and the excitation coil III (16) is wound in the annular groove of the piston rod (2); the excitation coil III (16) The lead wire is drawn out through the lead groove and lead hole on the piston rod (2); the inner surface of the circumference of the coil winding frame (5) is in interference fit with the outer surface of the magnetic isolation cylinder (15); the outer circumference of the coil winding frame (5) The surface is processed with two annular grooves, and the excitation coil I (6) and the excitation coil II (7) are respectively wound in the two annular grooves of the coil bobbin (5); the excitation coil I (6) and the excitation coil II The lead wires of (7) are respectively drawn out through the lead wire groove of the coil winding frame (5) and the lead wire hole of the piston rod (2); The magnetic field lines in the damping gap in the middle section cancel each other out, and the damper outputs a certain amount of damping force; when the excitation coil Ⅰ (6) and the exciting coil Ⅱ (7) are fed with different directions of current, the magnetic field lines in the damping gap in the middle section of the coil are superimposed on each other, and the damping The damper outputs a relatively large damping force; the double-coil structure enables the damper to perform two-stage damping force adjustment, and at the same time obtains a relatively large output damping force; the outer surface of the valve body (11) and the coil winding frame (5) The inner surface of the circumference is interference fit; the flange on the right side of the valve body (11) is processed with screw holes, and the valve body (11) and the coil winding frame (5) are fastened and connected by screws; the valve core (12) is processed into a T Cylindrical, the right end of the spool (12) is provided with a ball, and the diameter of the sphere is greater than the diameter of the circular through hole in the center of the valve body (11); On the same axis; the outer circumference of the left end of the spool (12) The surface is matched with the inner surface of the magnetic isolation cylinder (15) in a gap, and is sealed by a sealing ring; the left end surface of the valve core (12) is processed with a circular groove, and the permanent magnet (14) is embedded in the groove, and the permanent magnet (14) The left side is the N pole, and the right side is the S pole; the left end of the spring (13) is connected to the spool (12), and the right end of the spring (13) is connected to the right end of the inner cavity of the magnetic isolation cylinder (15); the outer surface of the floating piston (10) The gap fits with the inner surface of the damper cylinder (4) and is sealed by a seal ring; the right end cover of the damper (8) is in clearance fit with the damper cylinder (4) and is sealed by a seal ring; the right end cover of the damper ( 8) It is fixedly connected with the damper cylinder (4) through screws; the right end cover of the damper (8) is fixedly connected with the right suspension ring (9) through threads; the excitation coil III (16), the valve core (12), the permanent magnet (14 ), the valve body (11) and the spring (13) constitute the magnetic valve inside the damper; the spring (13) between the valve core (12) and the magnetic isolation cylinder (15) makes the second liquid flow channel in a normally open state , so that the damper obtains a small initial damping force; when the current is applied to the excitation coil III (16), the excitation coil III (16) generates an induced magnetic field, and the left side is the S pole, and the right side is the N pole; the excitation A repulsive force is generated between the coil III (16) and the permanent magnet (14), and then the spring (13) is compressed to move the spool (12) to the right, and the ball at the right end of the spool (12) blocks the center circle of the valve body (11). The larger the input current, the greater the displacement of the valve core (12) to the right, and the greater the blocking degree of the circular through hole in the center of the valve body (11); the built-in normally open magnetic valve ensures initial damping The force is a small value; the operation of the magnetic valve can close the second liquid flow channel, and the damper obtains a greater damping force, and finally increases the adjustable range of the damping force.

Compared with the background technology, the present invention has the beneficial effects of:

(1) The annular gap formed between the outer surface of the coil winding frame of the present invention and the inner surface of the cylinder body of the damper constitutes the first liquid flow channel through which the magnetorheological fluid flows; the outer surface of the magnetic isolation cylinder is evenly processed There are four grooves, and a circular through hole is processed in the center of the valve body; the grooved channel on the outer surface of the magnetic isolation cylinder and the circular through hole in the center of the valve body constitute the second liquid flow channel through which the magnetorheological fluid flows. The composition of the first liquid flow channel and the second liquid flow channel can effectively increase the output damping force of the damper, and at the same time reduce the initial output damping force, so that the adjustable range of the damping force is wider.

(2) The excitation coil I and the excitation coil II are respectively wound on the coil winding frame of the present invention, and three damping gaps can be formed at the same time, which effectively increases the output damping force; when the excitation coil I and the excitation coil II are fed with the same direction current When , the magnetic lines of force in the damping gap in the middle section of the coil cancel each other out, and the damper outputs a certain amount of damping force; Larger damping force; the double-coil structure enables the damper of the present invention to adjust the damping force in two stages, and at the same time obtain a larger output damping force.

(3) The excitation coil III at the right end of the piston rod of the present invention, the valve core, the permanent magnet, the valve body and the spring form the magnetic valve inside the damper; the ball at the right end of the valve core is on the same axis as the circular through hole in the center of the valve body; the valve The spring between the core and the magnetic isolation cylinder makes the second liquid flow channel in a normally open state, so that the damper can obtain a small initial damping force; the left end of the valve core is embedded with a permanent magnet, the left side of the permanent magnet is N pole, and the right The side is the S pole; the current is passed to the excitation coil III at the rightmost end of the piston rod, and the excitation coil III generates an induced magnetic field, and the left side is the S pole, and the right side is the N pole; a repulsive force is generated between the excitation coil III and the permanent magnet of the valve core , and then compress the spring to move the valve core to the right, and the ball at the right end of the valve core blocks the circular through hole in the center of the valve body; the greater the input current, the greater the displacement of the valve core, and the greater the blocking degree of the through hole of the valve body ;The built-in normally open magnetic valve can ensure the initial damping force is a small value; the working of the magnetic valve can close the second liquid flow channel, and the damper can obtain greater damping force, and finally the damping force of the damper can be adjusted. increase.

(4) The combination of the double-coil structure of the present invention and the built-in magnetic valve enables the damper to have a wider adjustable range of damping force while obtaining greater damping force. Compared with the magneto-rheological damper of the traditional structure, the magnetorheological damper of the present invention has a larger output damping force and a wider adjustable range of damping force, superior damping performance, and is more suitable for various vibration reduction occasions .

Description of drawings

Fig. 1 is a schematic diagram of the structure of the present invention.

Fig. 2 is a schematic diagram of the structure of the built-in magnetic valve of the present invention.

Fig. 3 is a sectional view of the piston part A-A of the present invention.

Fig. 4 is a schematic diagram of the power supply of the magnetic valve of the present invention.

Fig. 5 is a schematic diagram of the distribution of magnetic lines of force when the excitation coil I and the excitation coil II of the present invention pass currents in opposite directions.

Fig. 6 is a schematic diagram of the magnetic field line distribution when the excitation coil I and the excitation coil II of the present invention pass current in the same direction.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

As shown in Figure 1, the present invention comprises: left lifting ring (1), piston rod (2), damper left end cover (3), damper cylinder (4), coil bobbin frame (5), excitation coil I ( 6), excitation coil II (7), right end cover of damper (8), right lifting ring (9), floating piston (10), valve body (11), valve core (12), spring (13), permanent magnet ( 14), magnetic isolation cylinder (15) and excitation coil III (16).

Fig. 2 is a schematic diagram of the built-in magnetic valve of the present invention. The rightmost end of the piston rod (2) is wound with the excitation coil III (16); the left end of the spool (12) is inlaid with a permanent magnet (14), and the left side of the permanent magnet (14) is the N pole, and the right side is the S pole; the spring (13) is installed Between the spools (12); the excitation coil III (16) at the rightmost end of the piston rod, the spool (12), the permanent magnet (14), the valve body (11) and the spring (13) constitute the magnetic field inside the damper. valve.

Figure 3 is a sectional view of the piston part A-A of the present invention. The annular gap formed between the outer circumferential surface of the coil winding frame (5) and the inner circumferential surface of the damper cylinder (4) constitutes the first liquid flow channel through which the magnetorheological fluid flows; Four grooves are evenly processed on the surface, and a circular through hole is processed in the center of the valve body (11); the groove-shaped channel on the outer surface of the magnetic isolation cylinder (15) and the circular through hole in the center of the valve body (11) constitute The second flow channel through which the magnetorheological fluid flows.

Fig. 4 is a schematic diagram of the power supply of the magnetic valve of the present invention. Pass current to the excitation coil III (16) at the rightmost end of the piston rod (2), and the excitation coil III (16) generates an induced magnetic field, and the left side is the S pole, and the right side is the N pole. A repulsive force is generated between the excitation coil III (16) and the permanent magnet (14), and then the spring (13) is compressed to move the spool (12) to the right, and the ball at the right end of the spool (12) blocks the center of the valve body (11) Circular through hole. The greater the input current, the greater the displacement of the spool (12) moving to the right, and the greater the blocking degree of the circular through hole in the center of the valve body (11). At the same time, the magnetic isolation cylinder (15) confines the magnetic field lines of the excitation coil III (16) inside the cylinder, which will not affect the magnetorheological fluid.

Fig. 5 is a schematic diagram of the distribution of magnetic lines of force when the excitation coil I and the excitation coil II of the present invention pass currents in opposite directions. Both the coil winding frame (5) and the damper cylinder (4) are made of No. 10 steel magnetically conductive material, and the magnetic field lines generated by the excitation coil I (6) and excitation coil II (7) due to electromagnetic effects pass through the coil winding frame in sequence (5) and the damper cylinder (4) form a closed loop. The opposite direction current is passed to the excitation coil I (6) and the excitation coil II (7), and the magnetic force lines at the damping gap in the middle section of the excitation coil I (6) and the excitation coil II (7) are superimposed on each other.

Fig. 6 is a schematic diagram of the magnetic field line distribution when the excitation coil I and the excitation coil II of the present invention pass current in the same direction. The current in the same direction is passed into the excitation coil I (6) and the excitation coil II (7), and the magnetic force lines at the damping gap in the middle section of the excitation coil I (6) and the excitation coil II (7) cancel each other out.

The working principle of the present invention is as follows:

When the excitation coil III (16) is not supplied with current, the spool (12) is supported by the spring (13) to keep the solenoid valve in a normally-on state, and the damper obtains a lower damping force; when the excitation coil I (6) and When the excitation coil II (7) is supplied with current, the magnetic lines of force generated by the excitation coil due to electromagnetic effects pass through the effective damping channel vertically. When the excitation coil Ⅰ (6) and the excitation coil Ⅱ (7) are fed with the same direction current, the magnetic lines of force in the damping gap in the middle section of the coil cancel each other; When , the magnetic field lines of the damping gap in the middle section of the coil are superimposed on each other; due to the action of the magnetic field, the viscosity of the magnetorheological fluid flowing through the first liquid flow channel will increase, and the yield stress will increase. When the magnetorheological fluid flows through the first fluid flow channel, it needs to overcome the force between molecules arranged in chains, thereby increasing the viscous damping force of the magnetorheological damper. By adjusting the current in the excitation coil I (6) and the excitation coil II (7), the yield stress of the magnetorheological fluid can be changed to achieve the required output damping force.

When the damper encounters a working condition that requires a greater damping force, current is passed to the excitation coil III (16), and the excitation coil III (16) generates an induced magnetic field, and the left side is the S pole, and the right side is the N pole. A repulsive force is generated between the excitation coil III (16) and the permanent magnet (14), and then the spring (13) is compressed to move the valve core (14) to the right, and the ball at the right end of the valve core blocks the circular passage in the center of the valve body (11). The hole further increases the output damping force. Excitation coil III (16) is supplied with different currents, and the circular through hole in the center of the valve body (11) is blocked in different degrees. Therefore, adjusting the current of excitation coil III (16) can further adjust the output damping force.

Claims (2)

1. a kind of built-in magnet valve improves the two-wire ring MR damper of damping capacity, it is characterised in that：Including left hanging ring (1), piston rod (2), damper left end cap (3), damper cylinder body (4), coil winding frame (5), magnet exciting coil I (6), excitation wire Enclose II (7), damper right end cap (8), right hanging ring (9), floating piston (10), valve body (11), spool (12), spring (13), forever Magnet (14), every magnetic cylinder (15) and magnet exciting coil III (16)；Left hanging ring (1) is threadably secured with piston rod (2) to be connect； Circular through hole is machined among damper left end cap (3), between piston rod (2) and damper left end cap (3) circular through hole inner surface Gap coordinates, and passes through sealing ring and be sealed；Damper left end cap (3) and damper cylinder body (4) clearance fit, and pass through sealing Circle is sealed；Damper left end cap (3) is fixedly connected with damper cylinder body (4) by screw；Outside coil winding frame (5) circumference The ring gap formed between surface and damper cylinder body (4) circumferential inner surface forms the first liquid stream that magnetorheological fluid flows through and leads to Road；Every magnetic cylinder (15) outer surface, uniformly there are four grooves for processing, and there are one circular through holes for the processing of valve body (11) centre；Every The grooved passageway of magnetic cylinder (15) outer surface and the circular through hole at valve body (11) center form the second liquid that magnetorheological fluid flows through Circulation road；It is interference fitted every magnetic cylinder (15) circumferential inner surface and piston rod (2) right end outer surface；Piston rod (2) right end is processed There are one annular groove, magnet exciting coil III (16) is wrapped in the annular groove of piston rod (2)；The lead of magnet exciting coil III (16) It is drawn by the wire lead slot on piston rod (2) and fairlead；Coil winding frame (5) circumferential inner surface with every magnetic cylinder (15) appearance Face is interference fitted；There are two annular groove, magnet exciting coil I (6) and magnet exciting coils II for the processing of coil winding frame (5) external peripheral surface (7) it is respectively wound around in two annular grooves of coil winding frame (5)；The lead of magnet exciting coil I (6) and magnet exciting coil II (7) It is drawn respectively by the fairlead of the wire lead slot of coil winding frame (5) and piston rod (2)；When magnet exciting coil I (6) and magnet exciting coil When II (7) are passed through same direction current, the magnetic line of force of coil interlude damping clearance is cancelled out each other, and damper exports a certain size resistance Buddhist nun's power；When magnet exciting coil I (6) and magnet exciting coil II (7) are passed through heterodrome, the magnetic line of force phase of coil interlude damping clearance Mutually superposition, damper export a larger damping force；Double-coil type structure makes damper that can carry out two-stage damping force adjusting, together When obtain a larger output damping force；Valve body (11) outer surface is interference fitted with coil winding frame (5) circumferential inner surface；Valve Body (11) right flange periphery is machined with screw hole, and valve body (11) is fastenedly connected with coil winding frame (5) by screw；Spool (12) processing is T-shaped cylindric, and spool (12) right end is equipped with a ball, and it is straight that ball diameter is more than valve body (11) central circular through hole Diameter；Spool (12) right end ball and valve body (11) central circular through hole are on the same axis；Spool (12) left end external peripheral surface With every magnetic cylinder (15) circumferential inner surface clearance fit, and passing through sealing ring and being sealed；Spool (12) left side is machined with circle Annular groove, inlays permanent magnet (14) in slot, for N poles, right side is S poles on the left of permanent magnet (14)；Spring (13) left end and spool (12) it connects, spring (13) right end is connect with every magnetic cylinder (15) inner cavity right end；Floating piston (10) outer surface and damper cylinder Body (4) internal surface gaps coordinate, and pass through sealing ring and be sealed；Damper right end cap (8) is matched with damper cylinder body (4) gap It closes, and passes through sealing ring and be sealed；Damper right end cap (8) is fixedly connected with damper cylinder body (4) by screw；Damper Right end cap (8) is threadably secured with right hanging ring (9) and connect.

2. a kind of built-in magnet valve according to claim 1 improves the two-wire ring MR damper of damping capacity, special Sign is：Inside magnet exciting coil III (16), spool (12), permanent magnet (14), valve body (11) and spring (13) composition damper Magnet valve；Spool (12) and the spring (13) between magnetic cylinder (15) make the second fluid course be in normal open state, so as to make Damper obtains smaller initial damping force；When being passed through electric current to magnet exciting coil III (16), magnet exciting coil III (16) generates sense Magnetic field is answered, and left side is S poles, right side is N poles；Repulsion is generated between magnet exciting coil III (16) and permanent magnet (14), and then is compressed Spring (13) makes spool (12) move right, orb blocks valve body (11) central circular through hole of spool (12) right end；Input electricity Stream is bigger, and the displacement that spool (12) moves right is also bigger, and it is bigger that valve body (11) central circular through hole blocks degree；It is built-in normal Open type magnet valve, it is a smaller value to ensure initial damping force；Magnet valve work can be closed the second fluid course, and damper obtains bigger Damping force, finally make damping force adjustable extent increase.