CN108916291B

CN108916291B - Bidirectional damper

Info

Publication number: CN108916291B
Application number: CN201810988457.6A
Authority: CN
Inventors: 请求不公布姓名
Original assignee: Ningbo Maxwit Technology Co ltd
Current assignee: Ningbo Maxwit Technology Co ltd
Priority date: 2018-08-28
Filing date: 2018-08-28
Publication date: 2023-10-13
Anticipated expiration: 2038-08-28
Also published as: CN108916291A

Abstract

The invention provides a bidirectional damper, which comprises a cylinder body, two piston rods, an elastic diaphragm and a fixed piston, wherein the two piston rods are respectively arranged at two ends of the cylinder body, the elastic diaphragm is fixed in the cylinder body between floating pistons at two sides and is oppositely arranged, and the fixed piston is fixed in the cylinder body between the elastic diaphragms at two sides; one end of each piston rod is inserted into the cylinder body in a guiding way through the sealing mechanism, floating pistons sliding in the cylinder body are respectively arranged at the insertion ends of each piston rod, the floating pistons are respectively provided with a first damping channel communicated with the two sides of the floating pistons, each elastic diaphragm forms isolation of the space in the cylinder body at the two sides of the elastic diaphragm, a second damping channel communicated with the two sides of the fixed piston is formed in the fixed piston, and damping liquid is filled in the cylinder body at the two sides of each elastic diaphragm. The bidirectional damper can simplify the damper structure, reduce the cost and has better practicability.

Description

Bidirectional damper

Technical Field

The invention relates to the technical field of dampers, in particular to a bidirectional damper.

Background

A damper is a device for consuming movement energy by providing resistance to movement, and a hydraulic damper is one of the most widely used dampers, and has been widely used in applications requiring vibration damping in industrial facilities, transportation machines, and the like due to its sensitivity to speed response. The existing hydraulic damper generally realizes damping effect by damping fluid energy consumption through the orifice, and the flow rate of the damping fluid can be changed by adjusting the aperture of the orifice so as to achieve the effect of adjusting the damping coefficient of the damper.

In order to avoid leakage of damping fluid and ensure normal operation of the hydraulic damper, a complex sealing structure is required to be designed in the structure of the hydraulic damper, which can certainly cause the increase of the manufacturing cost of the damper, and meanwhile, the service life of the sealing structure is generally shorter due to abrasion generated in the operation of the damper, which brings about high enterprise of use and maintenance cost. In addition, the relative movement of the piston and the cylinder body in the hydraulic damper is easy to cause the situation that the damping force is not obviously improved under the high-speed condition, and the use effect of the damper is also affected.

Disclosure of Invention

In view of the above, the present invention is directed to a bi-directional damper that can at least simplify the damper structure and reduce the cost thereof.

In order to achieve the above purpose, the technical scheme of the invention is realized as follows:

a bi-directional damper comprising a cylinder, further comprising:

the piston rods are respectively arranged at two ends of the cylinder body, one end of each piston rod is inserted into the cylinder body in a guiding way through the sealing mechanism, floating pistons sliding in the cylinder body are respectively arranged at the insertion ends of the piston rods, and a first damping channel communicated between two sides of the floating pistons is arranged on each floating piston;

elastic diaphragms, which are fixed in the cylinder body between the floating pistons at two sides and are arranged oppositely, wherein each elastic diaphragm forms isolation of the space in the cylinder body at two sides of the elastic diaphragm;

the fixed piston is fixed in the cylinder body between the elastic diaphragms at the two sides, and a second damping channel communicated with the two sides of the fixed piston is formed in the fixed piston;

and, in addition, the method comprises the steps of,

damping fluid is filled in the cylinder bodies at two sides of each elastic diaphragm.

Further, the first damping channel is a damping groove arranged on the peripheral wall of the floating piston.

Further, the damping grooves are arranged at intervals along the circumferential direction of the floating piston.

Further, the sealing mechanism comprises a sealing seat sleeved on the piston rod and fixed at the end part of the cylinder body, a sealing ring arranged between the sealing seat and the cylinder body, and an oil seal arranged on the sealing seat and sleeved on the piston rod at the port of the cylinder body.

Further, an oil return channel is formed in the sealing seat, and the oil return channel is communicated with the oil seal and the cylinder body space inside the sealing seat.

Further, a scraper ring which is arranged around the piston rod and a linear bearing which is sleeved on the piston rod are arranged in the sealing seat.

Further, the damping liquid filled in the elastic diaphragm and close to one side of the fixed piston is electrorheological liquid, and an electrode unit which is electrically connected with an external circuit and is used for forming an electric field in the second damping channel is arranged in the fixed piston in an insulating manner.

Further, the fixed piston comprises a piston seat fixed in the cylinder body, and the elastic diaphragms on two sides are clamped and fixed in the cylinder body through the piston seat; the second damping channel axially penetrates through the piston seat, the electrode unit is fixed in the piston seat through the insulating bush, and one side end face of the electrode unit stretches into the second damping channel.

Further, the electrode unit is electrically connected with the external circuit through a connecting component extending to the outside of the cylinder body along the radial direction of the cylinder body, and the connecting component comprises an insulating seat fixed on the piston seat and arranged between the piston seat and the electrode unit in a sealing way, and a connecting piece connected with the electrode unit through an elastic piece, and one end of the connecting piece is positioned outside the cylinder body.

Further, the damping fluid filled at the other side of the elastic diaphragm is hydraulic oil

Compared with the prior art, the invention has the following advantages:

according to the bidirectional damper, through the arrangement of the floating pistons at the two sides and the elastic diaphragm, when the floating piston at one side is compressed, the piston at the other side extends out, so that the volume in the cylinder body of the piston structure can be kept unchanged all the time, and a compensation air chamber commonly adopted in the existing damping structure can be omitted, so that the structure of the damper is simplified, and the reliability is improved.

In addition, the fixed piston with the damping channel is fixed in the cylinder body, relative motion between the fixed piston and the cylinder body is avoided, and the damping force can be obviously improved by the static state of the fixed piston in a high-speed state, so that the damping effect is improved.

In addition, the damper is provided with the damping channels communicated with the two sides of the floating piston, so that the pressure of damping liquid on the sealing structure during the movement of the floating piston can be reduced, the sealing effect can be ensured by adopting the sealing structure with a simpler structure, the effects of simplifying the structure, reducing the processing cost and the like can be achieved, and the damper has better practicability.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:

FIG. 1 is a schematic diagram of a bi-directional damper according to an embodiment of the present invention;

FIG. 2 is a schematic structural view of a sealing mechanism according to an embodiment of the present invention;

FIG. 3 is a schematic view of a right floating piston according to an embodiment of the present invention;

FIG. 4 is a schematic view of a fixed piston according to an embodiment of the present invention;

FIG. 5 is a schematic view of a structure of an end portion of a base body for inserting a screw according to an embodiment of the present invention;

reference numerals illustrate:

the hydraulic damper comprises a 1-cylinder body, a 2-left piston rod, a 3-left connector, a 4-left floating piston, a 5-right piston rod, a 6-right connector, a 7-right floating piston, a 71-mounting hole, a 72-damping groove, an 8-left elastic diaphragm, a 9-right elastic diaphragm, a 10-connecting piece, an 11-inner guide sleeve, a 111-oil return channel, a 12-outer guide sleeve, a 13-oil seal, a 14-sealing ring, a 15-oil scraper ring, a 16-linear bearing, a 17-retainer ring, a 18-seat body, a 181-through hole, a 19-insulating bush, a 20-electrode unit, a 21-sealing ring, a 22-cover plate, a 23-screw rod, a 24-nut, a 25-gasket, a 26-insulating seat, a 27-elastic piece and a 28-second damping channel.

Detailed Description

It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.

In addition, it should be noted that in the present embodiment, the positional or positional relationship indicated by the terms such as "upper", "lower", "left", "right", "inner", "back", and the like are based on the positional or positional relationship shown in the drawings, and are merely for convenience of description of the present embodiment, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present embodiment. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The invention will be described in detail below with reference to the drawings in connection with embodiments.

The embodiment relates to a bidirectional damper, which structurally comprises a cylinder body, two piston rods respectively arranged at two ends of the cylinder body, elastic diaphragms oppositely arranged between floating pistons at two sides and fixed in the cylinder body, and fixed pistons fixed in the cylinder body between the elastic diaphragms at two sides. Wherein, the floating pistons at two sides are respectively provided with a first damping channel communicated with the two sides of the floating piston, the fixed piston is also internally provided with a second damping channel communicated with the two sides of the fixed piston, and the cylinder bodies at two sides of each elastic diaphragm are filled with damping liquid.

Based on the above overall structure, an exemplary structure of the damper of the present embodiment is shown in fig. 1, in which piston rods at both ends of the cylinder 1 are referred to as a left piston rod 2 and a right piston rod 5, respectively, and floating pistons and elastic diaphragms at the respective both ends are also referred to as a left floating piston 4, a right floating piston 7, and a left elastic diaphragm 8 and a right elastic diaphragm 9, respectively, for convenience of description. The left connecting head 3 and the right connecting head 6 are respectively connected to one ends of the left piston rod 2 and the right piston rod 4, which are positioned outside the cylinder body 1, and the connecting heads at the two ends are respectively used for connecting the piston rods at the respective ends with an external structure body.

In this embodiment, the left floating piston 4 and the right floating piston 7 are sleeved on the piston rods at the corresponding ends, and then are fixed by locking nuts screwed on the end parts of the piston rods. While the structure of the sealing mechanism for guiding the respective piston rod and for achieving the sealing between the piston rod and the cylinder 1 is shown in fig. 2. Specifically, the sealing mechanisms at two ends have the same structure, and take the sealing mechanism at the right end of the cylinder body 1 as an example, the sealing mechanism structurally comprises a sealing seat sleeved on the right piston rod 5 and fixed at the end part of the cylinder body 1, a sealing ring 14 arranged between the sealing seat and the cylinder body 1, and an oil seal 13 arranged on the sealing seat at the port of the cylinder body 1 and sleeved on the right piston rod 5.

In detail, the oil seal 13 is made of the existing product, the sealing seat is composed of an inner guide sleeve 11 and an outer guide sleeve 12 which are sleeved on the right piston rod 5 side by side, the outer guide sleeve 12 is close to one side of the port of the cylinder body 1, an O-shaped sealing ring for sealing is clamped between the outer guide sleeve 12 and the inner guide sleeve 11, and the sealing ring 14 is arranged in a groove formed on the outer peripheral wall of the inner guide sleeve 11. In the fixing of the sealing seat in the cylinder 1, as also shown in fig. 2, the end of the inner guide sleeve 11, which is close to the inner side of the cylinder 1, is formed with a notch, corresponding to which a projection protruding into the notch is rolled on the cylinder 1, whereby the positioning of one end of the sealing seat is achieved via the cooperation of the projection and the notch.

For the positioning of the other end of the sealing seat, in this embodiment, the edge of the cylinder 1 is crimped on the outer guide sleeve 12 by riveting the edge of the port of the cylinder 1, so that the fixing of the integral sealing mechanism in the cylinder 1 is realized by the positioning structure of the two ends of the sealing seat.

In this embodiment, in order that the damping fluid entering the oil seal 13 can flow back into the cylinder 1 inside the seal seat when the right piston rod 5 is pressed into the cylinder 1, an oil return passage 111 is provided in the seal seat to communicate the space between the oil seal 13 and the cylinder 1 inside. The backflow channel 111 is specifically realized by drilling holes in the inner guide sleeve 11, one end of the backflow channel 111 is communicated with the interior of the cylinder body 1, and the other end of the backflow channel 111 is communicated with the oil seal 13 through a gap between the inner guide sleeve 11 and the outer guide sleeve 12.

In addition, in order to reduce the flow of the damping fluid to the oil seal 13, in this embodiment, an oil scraper ring 15 is disposed in the sealing seat, specifically in the inner guide sleeve 11, surrounding the right piston rod 5, and the oil scraper ring 15 is structurally composed of an outer rubber supporting ring and an inner oil scraper structure made of polytetrafluoroethylene and bronze, and can be practically used as a commercial product of the span company. In order to realize good support and guide of the movement of the right piston rod 5, in this embodiment, a linear bearing 16 sleeved on the right piston rod 5 is further disposed in the inner guide sleeve 11, and the linear bearing 16 can be achieved by adopting the existing sliding bearing structure, and the linear bearing is disposed in the inner guide sleeve 11 by a retainer ring 17 located at one end of the inner guide sleeve 11.

In this embodiment, taking the right floating piston 7 on the right side as an example, as shown in fig. 3, each floating piston may be specifically mounted to the piston rod through a mounting hole 71 at the center thereof, and the aforementioned first damping channel provided on the floating piston to communicate between both sides thereof, which is specifically a damping groove 72 provided on the outer peripheral wall of the floating piston. The damping groove 72 may be semicircular in cross section and it is also preferable that it is a plurality of grooves spaced apart along the outer circumference of the floating piston. Of course, the damping groove 72 may have other shapes such as square, semi-oval, etc. instead of the semicircular cross section, and it is also possible that the first damping passage is formed as a hole near the middle of the floating piston and penetrating between both sides of the floating piston, instead of being formed in the outer peripheral wall of the floating piston.

In this embodiment, for the damping fluid filled at both sides of each elastic diaphragm, for example, it may be ordinary hydraulic oil, and the second damping channel on the fixed piston may be only designed to pass through the damping holes at both sides of the fixed piston. At this time, by adjusting the aperture of the damping hole on the fixed piston, the damping force effect can be changed.

However, the above-mentioned damping channel structure designed only as a damping hole structure makes the damper of the present embodiment still be a conventional passive damper structure, which has many drawbacks in specific use. Based on this, as another better possible way, in this embodiment, the damping fluid filled in the side of the elastic diaphragm close to the fixed piston is electrorheological fluid, and the other side of the elastic diaphragm is still filled with hydraulic oil, and meanwhile, an electrode unit electrically connected with an external circuit is disposed in the fixed piston, so as to form an electric field in the second damping channel. Therefore, the damper of the embodiment can be made into a semi-active control type electrorheological damper, and the using effect of the damper can be further improved.

It should be noted that, besides using an electrorheological fluid as the damping fluid on one side, it is also possible to replace the electrorheological fluid with an existing magnetorheological fluid by providing an exciting coil structure in the fixed piston, and for the case of using the electrorheological fluid, reference may be made to the mature structure of the existing magnetorheological damper, which will not be described in detail in this embodiment.

When the electrorheological fluid is applied, the electrorheological fluid is used as an emerging intelligent material, the rheological properties such as electrorheological fluid viscosity, plasticity and the like can be changed sharply under the action of an external electric field, free flowing liquid can be changed into semisolid instantaneously, the controllable yield strength is presented, and the change is reversible along with the change of the electric field. The controlled parameter of the electrorheological fluid damper is mainly the viscosity of electrorheological fluid, and the electrorheological fluid can realize the viscosity value which is continuously changed along with the change of the electric field intensity, so that the continuously adjustable output damping force can be obtained, meanwhile, the electric field control in the damper is combined with the sensor and the controller, the semi-active control of the vibration reduction system can be realized, and the damping effect matched with the external vibration excitation can be obtained along with the change of the external vibration excitation, so that the electrorheological fluid damper has the advantages of adjustable damping force, strong controllability, good responsiveness and the like.

And in the structure of the fixed piston when electrorheological fluids are used, as shown in fig. 4 and 5, wherein fig. 4 is a schematic view at a section angle A-A in fig. 5. At this time, the fixed piston comprises a piston seat which is fixed in the cylinder 1 and is composed of a seat body 18 and a cover plate 22, wherein a screw 13 which is specifically penetrated in the seat body 18 and the cover plate 22 is fixedly connected with a gasket 25 and a nut 24 which are positioned on one side of the cover plate 22, and the seat body 18 is positioned in the cylinder 1 in the same way as the notch-bulge matching structure.

The left elastic diaphragm 8 and the right elastic diaphragm 9 positioned on two sides of the embodiment are directly clamped and fixed in the cylinder body 1 through the piston seat, so that the arrangement can simplify the elastic diaphragm fixing mode and save unnecessary fixing structures. Of course, other structures than the fixing of the elastic diaphragms on both sides by the piston seat are also possible. In this embodiment, the electrode unit 20 is fixed in the piston seat through the insulating bush 19, the second damping channel 28 axially penetrates the piston seat (the seat body 18 and the cover plate 22), one side end surface of the electrode unit 20 extends into the second damping channel 28, and the electrode unit 20 is electrically connected to an external circuit through a connection assembly radially arranged along the cylinder 1 and extending out of the cylinder 1.

In order to realize the sealing of the filled electrorheological fluid, the sealing ring 21 is clamped between the electrode unit 20 and the insulating bush 19 in the embodiment, and the elastic diaphragm is pressed on the inner wall of the cylinder body 1 through the piston seat, so that the sealing isolation between the spaces at two sides of the elastic diaphragm is realized. In this embodiment, as a possible way, the above-mentioned connection assembly for electrically connecting the electrode unit 20 specifically includes an insulating base 26 fixed on the piston base, specifically, the base 18, and a connection member 10 disposed in the insulating base 18 and connected to the electrode unit 20 through an elastic member 27, and having one end located outside the cylinder 1.

In order to extend the connecting piece 10 from the cylinder 1, holes are needed to be formed in the corresponding positions on the peripheral wall of the cylinder 1, the bottom end of the insulating seat 26 is embedded into the electrode unit 20, and sealing rings are arranged between the insulating seat 26 and the piston seat as well as between the insulating seat 26 and the electrode unit 20 to prevent the leakage of the electrorheological fluid to the outside of the cylinder 1.

In addition, in this embodiment, each sealing ring may be made of nitrile rubber, the electrode unit 20 is a copper electrode, the insulating bush 19 and the insulating seat 26 are made of polytetrafluoroethylene, the elastic member 27 is a spring, the connecting member 10 is a stud, and the elastic member 27 and the connecting member 10 are made of metal materials with good conductivity. The cylinder body, the piston rod, the floating piston, the sealing seat, the piston seat and other structures in the damper of the embodiment are all made of steel materials.

When the bidirectional damper of the embodiment is used, the connectors at the two ends of the damper are connected with the external component, and the connecting piece 10 is connected with the power output port of the external control device. In particular, the motion condition of the external component can be detected by the sensing device, and the appropriate voltage is output to the electrode unit 20 after being analyzed and processed by the control device. The electrode unit 20 forms an electric field of a corresponding intensity in the second damping channel 28 according to a voltage applied thereto, whereby real-time adjustment of the damping force and thus semi-active control of the damper can be achieved.

The damper of this embodiment can cancel the compensation air chamber that generally adopts in the current damping structure through the setting of both sides floating piston and elastic diaphragm, and makes the damper structure simplify to increase the reliability, simultaneously, through filling ordinary hydraulic oil in one side of elastic diaphragm, also can reduce the use of electrorheological fluid to can also reduce the cost of damper, and have better practicality.

The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.

Claims

1. A bi-directional damper comprising a cylinder (1), characterized in that it further comprises:

the piston rods are respectively arranged at two ends of the cylinder body (1), one end of each piston rod is inserted into the cylinder body (1) in a guiding way through a sealing mechanism, floating pistons sliding in the cylinder body (1) are respectively arranged at the insertion ends of the piston rods, and a first damping channel communicated between two sides of the floating pistons is arranged on each floating piston;

elastic diaphragms which are fixed in the cylinder body (1) between the floating pistons at two sides in a relative arrangement manner, and each elastic diaphragm forms isolation of the space in the cylinder body (1) at two sides of the elastic diaphragm;

a fixed piston fixed in the cylinder (1) between the elastic diaphragms at two sides, and a second damping channel (28) communicated with the two sides of the fixed piston is constructed in the fixed piston;

and, in addition, the method comprises the steps of,

damping fluid is filled in the cylinder body (1) at two sides of each elastic diaphragm;

the damping liquid filled in one side of the elastic diaphragm, which is close to the fixed piston, is electrorheological liquid, and an electrode unit (20) which is electrically connected with an external circuit and used for forming an electric field in the second damping channel (28) is arranged in the fixed piston in an insulating manner;

the fixed piston comprises a piston seat fixed in the cylinder body (1), the elastic diaphragms on two sides are clamped and fixed in the cylinder body (1) through the piston seat, the second damping channel (28) axially penetrates through the piston seat, the electrode unit (20) is fixed in the piston seat through an insulating bushing (19), and one side end face of the electrode unit (20) stretches into the second damping channel (28);

the electrode unit (20) is electrically connected with the external circuit through a connecting component which extends to the outside of the cylinder body (1) along the radial direction of the cylinder body (1), and the connecting component comprises an insulating seat (26) which is fixed on the piston seat and is sealed between the piston seat and the electrode unit (20), and a connecting piece (10) which is connected with the electrode unit (20) through an elastic piece (27) and one end of which is positioned outside the cylinder body (1).

2. The bi-directional damper according to claim 1, wherein: the first damping channel is a damping groove (72) arranged on the peripheral wall of the floating piston.

3. The bi-directional damper according to claim 2, wherein: the damping grooves (72) are arranged at intervals along the circumferential direction of the floating piston.

4. The bi-directional damper according to claim 1, wherein: the sealing mechanism comprises a sealing seat sleeved on the piston rod and fixed at the end part of the cylinder body (1), a sealing ring arranged between the sealing seat and the cylinder body (1), and an oil seal (13) arranged on the sealing seat at the port of the cylinder body (1) and sleeved on the piston rod.

5. The bi-directional damper of claim 4 wherein: an oil return channel (111) is formed in the sealing seat and is communicated with the oil seal (13) and the space of the cylinder body (1) inside the sealing seat.

6. The bi-directional damper of claim 4 wherein: and the sealing seat is internally provided with an oil scraper ring (15) which is arranged around the piston rod and a linear bearing (16) which is sleeved on the piston rod.

7. The bi-directional damper according to claim 1, wherein: the damping liquid filled at the other side of the elastic diaphragm is hydraulic oil.