CN212690669U

CN212690669U - Double-valve-core magneto-rheological damper with adjustable damping gap

Info

Publication number: CN212690669U
Application number: CN202021021417.3U
Authority: CN
Inventors: 胡国良; 邵帅; 喻理梵; 曾礼平; 李辰龙; 李云昊
Original assignee: East China Jiaotong University
Current assignee: East China Jiaotong University
Priority date: 2020-06-06
Filing date: 2020-06-06
Publication date: 2021-03-12
Anticipated expiration: 2030-06-06

Abstract

The utility model discloses a damping clearance adjustable double-valve-core magneto-rheological damper, mainly by piston rod, end cover, cylinder body, piston head, yoke, case, separate magnetism bobbin, excitation coil etc. and constitute. Two sections of conical liquid flow channels are formed among the magnetic yoke, the magnetism isolating winding frame and the double valve cores, two sections of circular liquid flow channels are formed among gaps among the magnetic yoke, the magnetism isolating winding frame and the outer cylinder body, and eight sections of effective damping gaps connected in series are formed under the action of a magnetic field. The thickness of the damping gap can be changed by rotating the screw rod to adjust the positions of the double valve cores, and the effect of adjusting the magnitude of the damping force is achieved. When a certain amount of current is input to the two excitation coils, effective control of the damping force can be realized. The utility model discloses a serial-type liquid stream passageway has effectively increased liquid stream damping length, has guaranteed that the attenuator can export enough big and the wide damping force of adjustable range, and specially adapted railway, trade shock mitigation systems such as traffic.

Description

Double-valve-core magneto-rheological damper with adjustable damping gap

Technical Field

The utility model relates to a magnetic current becomes attenuator, especially relates to a damping clearance adjustable double-valve-core magnetic current becomes attenuator.

Background

The magneto-rheological damper has the characteristics of millisecond-level response speed, large control range and large damping force output, so that the magneto-rheological damper becomes an excellent semi-active execution device in the industrial application field. At present, the magnetorheological damper is widely applied to the fields of vibration reduction and earthquake resistance systems of buildings and bridges, vibration reduction of railway rolling stocks and automobile suspension systems and the like.

At present, the excitation coil of most of the magnetorheological dampers is wound in the circular groove of the piston head, and a liquid flow channel mostly flows through the annular gap formed between the outer surface of the piston and the inner surface of the cylinder body. When the magnetic field generator works, magnetorheological fluid flows in the annular gap, a magnetic field perpendicular to the flowing direction of the magnetorheological fluid is generated in the annular gap after the excitation coil is electrified, and controllable damping force is generated under the action of the magnetic field. The adjustment of the damping force of the magnetorheological damper is realized by changing the magnitude of the loading current and further changing the magnetic induction intensity. When the magnetic induction intensity in the damping gap reaches saturation, the output damping force of the damper reaches the maximum. The maximum damping force of the magnetorheological damper can be improved only by increasing the inner diameter of a damper cylinder body, changing the thickness of a damping gap, or adopting measures such as a multi-stage piston and the like. Therefore, limitations can be brought, for example, the increase of the inner diameter of a damper cylinder body can lead to the increase of the overall dimension of the damper, and the change of the thickness of a damping gap requires the adoption of magnetorheological dampers with different structures.

Disclosure of Invention

The utility model provides a damping clearance adjustable double-valve-core magneto-rheological damper mainly comprises piston rod, end cover, cylinder body, piston head, yoke, case, magnetism-isolating bobbin and excitation coil etc.. Two sections of conical liquid flow channels are formed among the magnetic yoke, the magnetic isolation winding frame and the double valve cores, two sections of circular liquid flow channels are formed among gaps among the magnetic yoke, the magnetic isolation winding frame and the outer cylinder body, the four liquid flow channels form the liquid flow channels which are connected in series, and eight sections of effective damping gaps which are connected in series are formed under the action of a magnetic field. The liquid flow channel formed among the magnetic yoke, the magnetism isolating winding frame and the double valve core can form a four-section conical effective damping gap, and the thickness of the damping gap can be changed by rotating the screw to adjust the position of the valve core, so that the effect of adjusting the damping force is achieved. When current is input to the two magnet exciting coils, the damping force can be effectively controlled by controlling the magnitude of the input current. The utility model discloses a serial-type liquid stream passageway has effectively increased liquid stream damping length, has guaranteed that the attenuator can export enough big and the wide damping force of adjustable range, and specially adapted railway, trade shock mitigation systems such as traffic.

The utility model provides a technical scheme that its technical problem adopted includes: the magnetic isolation type electromagnetic valve comprises a left lifting lug (1), a piston rod (2), a left end cover (3), an outer cylinder body (4), a left inner cylinder body (5), a piston head (6), a locking nut I (7), a screw rod (8), a locking nut II (9), a valve core I (10), a left magnetic yoke I (11), a magnetic isolation winding frame I (12), an excitation coil I (13), a right magnetic yoke I (14), a left magnetic yoke II (15), an excitation coil II (16), a magnetic isolation winding frame II (17), a right magnetic yoke II (18), a locking nut III (19), a right inner cylinder body (20), a valve core II (21), a locking nut IV (22), a right end cover (23) and a fixing nut (24); the piston rod (2) is fixedly connected with the left lifting lug (1) through threads; a circular through hole is processed in the middle of the left end cover (3), and the piston rod (2) is in clearance fit with the inner surface of the circular through hole of the left end cover (3) and is sealed by a sealing ring; the left end cover (3) is in transition fit with the inner surface of the left inner cylinder body (5) and is sealed by a sealing ring; the left end cover (3) is fixedly connected with the outer cylinder body (4) through a screw; the piston head (6) is provided with a central through hole, and the central through hole of the piston head (6) is in interference fit with the circumferential surface of the piston rod (2); a shaft shoulder is processed at the right end of the piston rod (2), and the left end surface of the piston head (6) is abutted against the right end surface of the shaft shoulder of the piston rod (2); the locking nut I (7) is fixedly connected with the right end part of the piston rod (2) through threads; the locking nut I (7) and the shaft shoulder of the piston rod (2) jointly axially fix the piston head (6); the outer surface of the piston head (6) is in clearance fit with the inner surface of the left inner cylinder body (5) and is sealed by a sealing ring; the left magnet yoke I (11) is in clearance fit with the left inner cylinder body (5) and is sealed through a sealing ring; the left magnetic yoke I (11) and the right magnetic yoke I (14) are in interference fit with the magnetism isolating winding frame I (12) respectively; a circular groove is defined by the right end face of the left magnetic yoke I (11), the left end face of the right magnetic yoke I (14) and the outer circumferential surface of the magnetism isolating winding frame I (12); the excitation coil I (13) is wound in the annular groove, and a lead of the excitation coil I is led out from a lead hole I (401) of the outer cylinder body (4); the right magnetic yoke II (18) is in transition fit with the outer surface of the right inner cylinder body (20) and is sealed through a sealing ring; the left magnetic yoke II (15) and the right magnetic yoke II (18) are respectively in interference fit with the magnetism isolating winding frame II (17); a circular groove is defined by the right end face of the left magnetic yoke II (15), the left end face of the right magnetic yoke II (18) and the outer circumferential surface of the magnetism isolating winding frame II (17); the excitation coil II (16) is wound in the annular groove, and a lead of the excitation coil II is led out from a lead hole II (402) of the outer cylinder body (4); a circular through hole is processed in the middle of the valve core I (10); the inner surface of the circular through hole of the valve core I (10) is in clearance fit with the outer surface of the circumference of the screw rod (8); the valve core I (10) and the screw rod (8) are axially fixed through a locking nut II (9) and a locking nut III (19); a circular through hole is processed in the middle of the valve core II (21); the inner surface of the circular through hole of the valve core II (21) is in clearance fit with the outer surface of the circumference of the screw rod (8); the valve core II (21) and the screw rod (8) are axially fixed through a locking nut III (19) and a locking nut IV (22); the outer circumferential surface of the right end of the right inner cylinder body (20) is in clearance fit with the inner circumferential surface of the outer cylinder body (4) and is sealed by a sealing ring; a circular through hole is processed in the middle of the right end cover (23), and the screw rod (8) is in clearance fit with the inner surface of the through hole of the right end cover (23) and is sealed by a sealing ring; the outer surface of the left end circumference of the right end cover (23) is in clearance fit with the inner surface of the circumference of the right inner cylinder body (20) and is sealed by a sealing ring; the right end cover (23) is fixedly connected with the outer cylinder body (4) through a set screw. 5 circular flow guide through holes are uniformly processed on the outer surface of the left side of the left inner cylinder body (5) in the circumferential direction; five circular flow guide through holes are uniformly processed on the outer surface of the right side of the right inner cylinder body (20); and a lead hole I (401) and a lead hole II (402) are processed on the lower right side of the outer cylinder body (4) along the same bus. The outer cylinder body (4), the left magnetic yoke I (11), the right magnetic yoke I (14), the left magnetic yoke II (15), the right magnetic yoke II (18), the valve core I (10) and the valve core II (21) are made of low-carbon magnetic conductive materials; the other parts are made of non-magnetic materials. A conical liquid flow channel A is formed among the valve core I (10), the magnetism isolating winding frame I (12), the left magnetic yoke I (11) and the right magnetic yoke I (14); the outer surfaces of the magnetic separation bobbin I (12), the left magnetic yoke I (11) and the right magnetic yoke I (14) and the inner surface of the outer cylinder body (4) adopt smooth cylindrical surface structures, the gap between the magnetic separation bobbin I (12), the left magnetic yoke I (11), the right magnetic yoke I (14) and the inner surface of the outer cylinder body (4) is 1mm, and a circular liquid flow channel B is formed by the gap between the outer surfaces of the magnetic separation bobbin I (12), the left magnetic yoke I (11) and the right magnetic yoke I (; a conical liquid flow channel C is formed among the left magnetic yoke II (15), the excitation bobbin II (17), the right magnetic yoke II (18) and the valve core II (21); a circular liquid flow channel D with a clearance of 1mm is formed between the outer surfaces of the left magnetic yoke II (15), the excitation bobbin II (17) and the right magnetic yoke II (18) and the inner surface of the outer cylinder body (4); the conical liquid flow channel A, the liquid flow channel C, the circular liquid flow channel D and the circular liquid flow channel B form a liquid flow channel structure connected in series; when excitation current with a certain magnitude is introduced into the excitation coil I (13), magnetic lines of force generated by electromagnetic induction reach the valve core I (10) through the outer cylinder body (4), the circular ring liquid flow channel B, the left magnetic yoke I (11) and the conical liquid flow channel A, and then return to the outer cylinder body (4) through the conical liquid flow channel A, the right magnetic yoke I (14) and the circular ring liquid flow channel B to form a closed loop; when the same-direction current is input to the excitation coil II (16), magnetic lines of force generated by electromagnetic induction reach the valve core II (21) through the outer cylinder body (4), the circular liquid flow channel D, the left magnetic yoke II (15) and the conical liquid flow channel C, and then return to the cylinder body (4) through the conical liquid flow channel C, the right magnetic yoke II (18) and the circular liquid flow channel D to form a closed loop. At the moment, eight sections of effective damping gaps I, II, III, IV, V, VI, VII and VIII are formed in the flow channels which are connected in series; the positions of the valve core I (10) and the valve core II (21) can be synchronously adjusted by rotating the screw rod (8), and the thickness of a damping gap between the conical liquid flow channel A and the conical liquid flow channel C is changed at the moment, so that the damping force of the magnetorheological fluid flowing through is adjusted, and the magnetorheological fluid can be fixed by a fixing screw (24) after the position is adjusted.

Compared with the background art, the utility model, the beneficial effect who has is:

(1) the utility model discloses magnetorheological damper adopts serial-type liquid flow channel structure, under the prerequisite that does not increase magnetorheological damper overall dimension, can obtain great controllable damping force under less exciting current effect. Compared with the magnetorheological damper with a single annular liquid flow channel, the dynamic damping force adjusting range is wider, and the magnetorheological damper is particularly suitable for vibration damping systems in railway, traffic and other industries.

(2) Compared with the conventional fixed and non-adjustable magnetorheological damper with the damping clearance, the tapered liquid flow channel A and the tapered liquid flow channel C which are formed between the two pairs of magnetic yokes, the winding frame and the valve core II of the magnetorheological damper can form four sections of tapered effective damping clearances; the position of the valve core can be adjusted by manually rotating the screw rod, and the gap between the two conical surfaces is changed, so that the damping gap can be adjusted, and the damping force adjusting range of the magnetorheological damper is further improved.

(3) The parts used by the magnetorheological damper of the utility model are made of low-carbon magnetic conductive materials, such as an outer cylinder body, a left magnetic yoke I, a right magnetic yoke I, a left magnetic yoke II, a right magnetic yoke II, a valve core I and a valve core II; the other parts are made of non-magnetic materials. The design can effectively ensure that magnetic lines of force are distributed in eight sections of effective damping gaps as intensively as possible, fully play the role of the vertical magnetic field on the magnetorheological fluid, improve the efficiency of the magnetorheological damper and effectively reduce the energy consumption of the magnetorheological damper.

Drawings

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

Fig. 2 is a cross-sectional view of the left end cap of the present invention.

Fig. 3 is a left side view of the left end cap of the present invention.

Fig. 4 is a cross-sectional view of the magnetic-isolating bobbin bracket of the present invention.

Fig. 5 is a cross-sectional view of the valve core I of the present invention.

Fig. 6 is a sectional view of the outer cylinder body of the present invention.

Fig. 7 is a left side view of the outer cylinder body of the present invention.

Fig. 8 is a cross-sectional view of the left inner cylinder body of the present invention.

Fig. 9 is a left side view a-a of fig. 8.

Fig. 10 is a cross-sectional view of the right inner cylinder body of the present invention.

Fig. 11 is a left side view B-B of fig. 10.

Fig. 12 is a magnetic line distribution diagram when two excitation coils of the present invention input the same direction current.

Fig. 13 is a magnetic line distribution diagram when two exciting coils of the present invention input reverse current.

Detailed Description

The invention will be further explained with reference to the following figures and examples:

fig. 1 is a schematic structural diagram of the present invention. Mainly include left lug 1, piston rod 2, left end lid 3, outer cylinder body 4, left side inner cylinder body 5, piston head 6, lock nut I7, screw rod 8, lock nut II 9, case I10, left yoke I11, separate magnetism bobbin I12, excitation coil I13, right yoke I14, left yoke II 15, excitation coil II 16, separate magnetism winding clamp 17 after, right yoke II 18, lock nut III 19, right side inner cylinder body 20, case II 21, lock nut IV 22, right-hand member lid 23 and fixation nut 24.

Fig. 2 is the left end cover cross-sectional view of the utility model, and fig. 3 is the left end cover left side view of the utility model. A circular through hole is processed in the center of the left end face of the left end cover 3 and is used for being in clearance fit with the outer surface of the piston rod 2. A sealing ring groove is processed on the inner surface of the circular through hole; the left end face of the left end cover 3 is provided with 6 threaded through holes, and the positioning connection with the outer cylinder body 4 can be achieved through screws.

Fig. 4 is a cross-sectional view of the magnetic-isolating bobbin bracket of the present invention. The left magnetic yoke I11 and the right magnetic yoke I14 are in interference fit with the magnetism isolating winding frame I12 respectively; a conical through hole is processed in the middle of the magnetic isolation winding frame I12.

Fig. 5 is a cross-sectional view of the valve core of the present invention. The valve core I is designed into a circular truncated cone shape, a circular through hole is formed in the center of the valve core I, and the valve core I is in clearance fit with the screw rod and is axially fixed by the locking nut.

Fig. 6 is a sectional view of the outer cylinder of the present invention, and fig. 7 is a left side view of the outer cylinder. The left end face and the right end face of the outer cylinder body are respectively provided with 5 threaded holes which are uniformly arranged in the circumferential direction and respectively correspond to 5 circular through holes formed in the left end cover 3 and the right end cover 23, and the threaded holes are fixed through screws. And a lead hole I401 and a lead hole II 402 are processed on the lower right side of the outer cylinder body 4 along the same bus.

FIG. 8 is a cross-sectional view of the left inner cylinder body of the present invention; fig. 9 is a left side view of the left inner cylinder of the present invention, 5 circular flow guiding through holes are evenly circumferentially opened on the left outer surface of the left inner cylinder 5, which plays a role of communicating the left cavity of the piston head 7 with the right cavity of the piston head 7.

FIG. 10 is a cross-sectional view of the right inner cylinder body of the present invention; fig. 11 is a left side view of the right inner cylinder body of the present invention, 5 circular flow guiding through holes are circumferentially and uniformly opened on the outer surface of the right side of the right inner cylinder body 20, and the flow guiding through holes serve to communicate the right cavity of the piston head 7 with the left cavity of the piston head 7.

Fig. 12 shows the magnetic force distribution diagram when two excitation coils of the utility model input the equidirectional current, the magnetic force line that excitation coil I13 electromagnetic induction produced reachs case I10 through outer cylinder body 4, ring flow channel B, left yoke I11, toper flow channel A, returns outer cylinder body 4 through toper flow channel A, right yoke I14, ring shape flow channel B again, forms closed loop. Magnetic force lines generated by the excitation coil II 16 reach the valve core II 21 through the outer cylinder body 4, the circular liquid flow channel D, the left magnetic yoke II 15 and the conical liquid flow channel C, and then return to the cylinder body 4 through the conical liquid flow channel C, the right magnetic yoke II 18 and the circular liquid flow channel D to form a closed loop. At the moment, eight sections of effective damping gaps I, II, III, IV, V, VI, VII and VIII are formed in the flow channels which are connected in series.

Fig. 13 shows the magnetic force distribution diagram when two excitation coils of the utility model input reverse current, magnetic force line that excitation coil I13 electromagnetic induction produced reachs case I10 through outer cylinder body 4, ring flow channel B, left yoke I11, toper flow channel A, returns outer cylinder body 4 through toper flow channel A, right yoke I14, ring shape flow channel B again, forms closed circuit. Magnetic force lines generated by the excitation coil II 16 reach the valve core II 21 through the outer cylinder body 4, the circular liquid flow channel D, the right magnetic yoke II 18 and the conical liquid flow channel C, then return to the cylinder body 4 through the conical liquid flow channel C, the left magnetic yoke II 15 and the circular liquid flow channel D to form a closed loop. At the moment, eight sections of effective damping gaps I, II, III, IV, V, VI, VII and VIII are formed in the flow channels which are connected in series.

The utility model discloses the theory of operation as follows:

the conical flow channel A, the conical flow channel C, the circular flow channel D and the circular flow channel B form a liquid flow channel structure in series. When the excitation coil I and the excitation coil II input current, the shear yield stress of the eight sections of effective damping gaps under the action of the magnetic field is increased, and larger damping force can be output.

Claims

1. The utility model provides a damping clearance adjustable double-valve core magnetic current becomes attenuator which characterized in that includes: the magnetic isolation type electromagnetic valve comprises a left lifting lug (1), a piston rod (2), a left end cover (3), an outer cylinder body (4), a left inner cylinder body (5), a piston head (6), a locking nut I (7), a screw rod (8), a locking nut II (9), a valve core I (10), a left magnetic yoke I (11), a magnetic isolation winding frame I (12), an excitation coil I (13), a right magnetic yoke I (14), a left magnetic yoke II (15), an excitation coil II (16), a magnetic isolation winding frame II (17), a right magnetic yoke II (18), a locking nut III (19), a right inner cylinder body (20), a valve core II (21), a locking nut IV (22), a right end cover (23) and a fixing nut (24); the piston rod (2) is fixedly connected with the left lifting lug (1) through threads; a circular through hole is processed in the middle of the left end cover (3), and the piston rod (2) is in clearance fit with the inner surface of the circular through hole of the left end cover (3) and is sealed by a sealing ring; the left end cover (3) is in transition fit with the inner surface of the left inner cylinder body (5) and is sealed by a sealing ring; the left end cover (3) is fixedly connected with the outer cylinder body (4) through a screw; the piston head (6) is provided with a central through hole, and the central through hole of the piston head (6) is in interference fit with the circumferential surface of the piston rod (2); a shaft shoulder is processed at the right end of the piston rod (2), and the left end surface of the piston head (6) is abutted against the right end surface of the shaft shoulder of the piston rod (2); the locking nut I (7) is fixedly connected with the right end part of the piston rod (2) through threads; the locking nut I (7) and the shaft shoulder of the piston rod (2) jointly axially fix the piston head (6); the outer surface of the piston head (6) is in clearance fit with the inner surface of the left inner cylinder body (5) and is sealed by a sealing ring; the left magnet yoke I (11) is in clearance fit with the left inner cylinder body (5) and is sealed through a sealing ring; the left magnetic yoke I (11) and the right magnetic yoke I (14) are in interference fit with the magnetism isolating winding frame I (12) respectively; a circular groove is defined by the right end face of the left magnetic yoke I (11), the left end face of the right magnetic yoke I (14) and the outer circumferential surface of the magnetism isolating winding frame I (12); the excitation coil I (13) is wound in the annular groove, and a lead of the excitation coil I is led out from a lead hole I (401) of the outer cylinder body (4); the right magnetic yoke II (18) is in transition fit with the outer surface of the right inner cylinder body (20) and is sealed through a sealing ring; the left magnetic yoke II (15) and the right magnetic yoke II (18) are respectively in interference fit with the magnetism isolating winding frame II (17); a circular groove is defined by the right end face of the left magnetic yoke II (15), the left end face of the right magnetic yoke II (18) and the outer circumferential surface of the magnetism isolating winding frame II (17); the excitation coil II (16) is wound in the annular groove, and a lead of the excitation coil II is led out from a lead hole II (402) of the outer cylinder body (4); a circular through hole is processed in the middle of the valve core I (10); the inner surface of the circular through hole of the valve core I (10) is in clearance fit with the outer surface of the circumference of the screw rod (8); the valve core I (10) and the screw rod (8) are axially fixed through a locking nut II (9) and a locking nut III (19); a circular through hole is processed in the middle of the valve core II (21); the inner surface of the circular through hole of the valve core II (21) is in clearance fit with the outer surface of the circumference of the screw rod (8); the valve core II (21) and the screw rod (8) are axially fixed through a locking nut III (19) and a locking nut IV (22); the outer circumferential surface of the right end of the right inner cylinder body (20) is in clearance fit with the inner circumferential surface of the outer cylinder body (4) and is sealed by a sealing ring; a circular through hole is processed in the middle of the right end cover (23), and the screw rod (8) is in clearance fit with the inner surface of the through hole of the right end cover (23) and is sealed by a sealing ring; the outer surface of the left end circumference of the right end cover (23) is in clearance fit with the inner surface of the circumference of the right inner cylinder body (20) and is sealed by a sealing ring; the right end cover (23) is fixedly connected with the outer cylinder body (4) through a set screw.

2. The dual-spool magnetorheological damper with the adjustable damping gap of claim 1, wherein: 5 circular flow guide through holes are uniformly processed on the outer surface of the left side of the left inner cylinder body (5) in the circumferential direction; five circular flow guide through holes are uniformly processed on the outer surface of the right side of the right inner cylinder body (20); and a lead hole I (401) and a lead hole II (402) are processed on the lower right side of the outer cylinder body (4) along the same bus.

3. The dual-spool magnetorheological damper with the adjustable damping gap of claim 1, wherein: the outer cylinder body (4), the left magnetic yoke I (11), the right magnetic yoke I (14), the left magnetic yoke II (15), the right magnetic yoke II (18), the valve core I (10) and the valve core II (21) are made of low-carbon magnetic conductive materials; the other parts are made of non-magnetic materials.