CN202851802U - Dual-rod magnetorheological fluid damper and seal structure thereof - Google Patents

Abstract

The utility model relates to a double-rod magneto-rheological fluid damper and its sealing structure. Tetrafluoro gaskets and copper gaskets are respectively arranged between the two ends of the cylinder body and the piston rod of the piston, and the inner surface of the tetrafluoro gaskets passes through the The copper gasket is close to the stepped surface of the end face of the cylinder body, and the outer surface is connected with the end cover. There is a groove at the joint between the PTFE gasket and the piston rod of the piston, and an O-shaped seal for sealing the piston rod is placed in the groove. lock up. The utility model adopts the combination sealing structure of O-ring embedded in the PTFE gasket, which has simple and compact structure, convenient operation and loading and unloading, low price, and excellent double sealing performance and effect, which can prolong the service life of magnetorheological fluid dampers and similar products. service life. The structure of pressing the sealing part through the copper sheet and the external end cover, and fastening with external screws can flexibly adjust the coaxiality of the magneto-rheological fluid damper, and the parallelism between the piston and the cylinder can further improve the magneto-rheological fluid damper. The performance of the rheological fluid damper can be used as a reference for the design of the current hydraulic damper.

Description

Double rod magneto-rheological fluid damper and its sealing structure

technical field

The utility model relates to a magnetorheological fluid damper with double outlet rods, in particular to a sealing structure in the magnetorheological fluid damper with double outlet rods. the

Background technique

The magnetorheological fluid damper is an adjustable damping device using magnetorheological fluid as the working fluid. The mechanical properties of the magnetorheological fluid damper can be continuously controlled by an external magnetic field. The working fluid is a magnetorheological fluid, which is mainly composed of carrier fluid, magnetic particles and additives. When there is no external magnetic field, the magnetic fluid exhibits the characteristics of a low-viscosity Newtonian fluid. Once an external magnetic field is added, it will appear as a high-viscosity fluid. Viscosity in a semi-solid state. Because magnetorheological fluid dampers have the advantages of wide adjustable range, fast response speed, low power consumption, and simple structure, they have broad application prospects in vibration control fields such as mechanical vibration, vehicles, and building structures. the

The current magneto-rheological fluid damper mainly adopts the structure in which the inside of the cylinder is completely filled with magnetorheological fluid. During the working process, the pressure inside the liquid is relatively high, so leakage problems are prone to occur, so it is necessary to design a sealing structure with excellent performance. At the same time, the current commonly used sealing method is to use a single O-ring. Under this design structure, during the frequent reciprocating motion of the piston, a large number of hard magnetic solid particles in the magnetorheological fluid enter the piston rod and the O-ring. In between, the O-ring and the piston rod are worn, making the seal of the magneto-rheological fluid damper invalid. the

In recent years, in practical engineering applications, due to the short service life of the magnetorheological fluid damper due to its sealing, researchers have conducted a lot of research on the surface finish of the piston rod and the performance of the magnetorheological fluid in order to extend The service life of the sealing part improves its performance, but this method greatly increases the price of the magneto-rheological fluid damper, thus making the technology of the magnetorheological fluid damper far from further use. the

Contents of the invention

In order to solve the technical problems of high cost, difficult sealing and short service life of traditional dampers, the utility model provides a double-rod magnetorheological fluid damper and its sealing structure, which is not only low in cost, but also economical and practical with long service life . the

In order to achieve the above object, the utility model adopts the following technical solutions:

A dual-rod magneto-rheological fluid damper and its sealing structure, including a cylinder body, an end cover, and a piston, characterized in that PTFE gaskets for sealing are respectively provided between the two ends of the cylinder body and the piston rod of the piston and copper gasket, and the inner surface of the PTFE gasket is close to the stepped surface of the end surface of the cylinder body through the copper gasket, the outer surface is connected with the end cover, and there is a groove at the joint between the PTFE gasket and the piston rod of the piston , O-rings for piston rod sealing are placed in the groove.

The end cover and the cylinder body are fixedly connected by four bolts and the compression screw holes on the end surface of the cylinder body, so that the end cover compresses the PTFE gasket. the

A bolt hole for supplementing the magnetorheological fluid injection is provided on the wall of the cylinder body. A central through hole is processed on the piston rod at one end of the piston, and the excitation coil wound around the middle part of the piston is led out from the central through hole through the coil wire for connecting an external power supply. the

The excitation coil is a copper coil, which is wound by a copper wire with a diameter of 1 mm. the

Compared with the prior art, the utility model has the following beneficial effects:

1) Adopt the combination sealing structure of O-ring embedded in PTFE gasket, simple and compact structure, convenient operation, loading and unloading, low price, and double sealing performance and effect are excellent, which can prolong the use of magnetorheological fluid dampers and similar products life.

2) The structure of pressing the sealing part through the copper sheet and the external end cover, and fastening with external screws can flexibly adjust the coaxiality of the magnetorheological fluid damper, and the parallelism between the piston and the cylinder can be further improved. It improves the performance of the magnetorheological fluid damper, and has a reference effect on the design of the current oil pressure damper. the

Description of drawings

Fig. 1 is a structural sectional view of the utility model. the

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is further described. the

As shown in Figure 1, the double-rod magnetorheological damper and its sealing structure of the present invention include a tetrafluoro gasket 1 with a groove inside, a copper gasket 2, a liquid injection bolt hole 3, a cylinder body 4, Press screw hole 5, end cover 6, piston 7, coil wire 8, O-ring 9, excitation coil 10. Among them, the PTFE gasket 1 is made of PTFE material, with a groove inside for placing the O-ring 9, the cylinder body 4 and the piston 7 are both cylindrical, and are made of high magnetic permeability material 20 steel; the end cover 6 Made for metals with low magnetic permeability such as copper. the

Between the two ends of the cylinder 4 and the piston rod of the piston 7, there are respectively a tetrafluoro gasket 1 and a copper gasket 2 for sealing, and the inner surface of the tetrafluoro gasket 1 is close to the end surface of the cylinder 4 through the copper gasket 2 On the step surface, the outer surface is connected with the end cover 6, and there is a groove at the connection between the PTFE gasket 1 and the piston rod of the piston 7, and an O-ring 9 for sealing the piston rod is placed in the groove. It adopts the structure of O-ring embedded in the PTFE gasket, and the copper gasket is added to prevent the deformation and failure of the PTFE gasket. the

A liquid injection bolt hole 3 is opened on the wall of the cylinder body 4 for supplementing the magnetorheological fluid; the cylinder body 4 and the end caps 6 at both ends are respectively fixed by four bolts through the compression screw holes 5, and the piston rod at one end of the piston 7 is machined There is a central through hole, and the excitation coil 10 wound around the middle part of the piston 7 is drawn out from the central through hole through the coil wire 8 for connecting an external power supply. The excitation coil 10 is a copper coil, which is wound with a copper wire with a diameter of 1 mm. the

Its assembly and working principle are as follows: first install the excitation coil 10 in the groove of the piston 7, and lead out the two ends of the excitation coil with the current-carrying wire 8 respectively; install the O-ring 9 into the PTFE gasket 1; Install the copper gasket 2 and the PTFE gasket with O-ring in turn; install the piston 7, copper gasket 2, and PTFE gasket 1 with O-ring into the cylinder body 4, and then at the other end Assemble according to the above steps; adjust the position through the end caps 6 at both ends and the screws at the compression screw holes 5, and finally inject an appropriate amount of magnetorheological fluid into the 3 bolt holes on the cylinder 4 with a syringe, and use the bolts Seal it up. the

In the absence of an external magnetic field, the magneto-rheological fluid damper works in the same way as the ordinary oil pressure damper; the excitation coil is energized through the current-carrying wire to generate a magnetic field. Under the action of a magnetic field, the magneto-rheological fluid damper will generate a shear force dozens of times that of the oil pressure damper, and the magnitude of the shear damping force will change with the change of the current in the excitation coil; once When the magnetic field is removed, the magneto-rheological fluid damper will return to the state of the original oil pressure damper. the

Claims (4)

1. A dual-rod magnetorheological fluid damper and its sealing structure, including a cylinder body (4), an end cover (6), and a piston (7), characterized in that: the two ends of the cylinder body (4) are connected to A PTFE gasket (1) and a copper gasket (2) are provided between the piston rods of the piston (7) for sealing, and the inner surface of the PTFE gasket (1) is closely attached to the On the stepped surface of the end surface of the cylinder body (4), the outer surface is connected with the end cover (6), and there is a groove at the connection between the PTFE gasket (1) and the piston rod of the piston (7). O-ring (9) for piston rod seal. 2. The double-rod magnetorheological fluid damper and its sealing structure according to claim 1, characterized in that four bolts and the cylinder (4) are connected between the end cover (6) and the cylinder (4) 4) The compression screw holes (5) on the end face are fixedly connected, so that the end cover (6) presses the PTFE gasket (1). 3. The double-rod magnetorheological fluid damper and its sealing structure according to claim 1, characterized in that: there is a bolt on the wall of the cylinder (4) for supplementing the magnetorheological fluid hole (3). 4. The double-rod magnetorheological fluid damper and its sealing structure according to claim 1, characterized in that: the piston rod at one end of the piston (7) is processed with a central through hole, which is wound in the middle of the piston (7) Part of the excitation coil (10) is led out from the central through hole through the coil wire (8), and is used for connecting an external power supply.

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