阅读说明：本技术 一种活塞杆内置的流体惯容器 (Fluid inertial container with built-in piston rod ) 是由 杜甫 杨勇 韩小玲 徐梦岩 高晓东 聂维 王乐 徐龙 于 2021-08-03 设计创作，主要内容包括：本发明涉及减振隔振技术领域,公开一种活塞杆内置的流体惯容器,包括缸筒、活塞、第一活塞杆、第二活塞杆和铰链座；所述活塞活动设置所述缸筒的内腔,并与所述缸筒内壁相对的表面设置有凹槽,所述活塞相对的侧壁上分别设置第一活塞杆和第二活塞杆；所述第一活塞杆的一端置于所述活塞的内部,并与所述活塞之间形成与外部大气连通的空腔,另一端固定在所述缸筒的侧壁并连接有铰链座；所述第二活塞杆的一端固定在所述活塞的侧壁上,另一端穿过所述缸筒的侧壁也连接有铰链座。本发明在保持流体惯容器原有力学性质不变的情况下,能够减小流体惯容器的轴向尺寸,减少配合面的数量,降低整体的装配难度,使其结构更紧凑,空间利用率更高。(The invention relates to the technical field of vibration reduction and isolation, and discloses a fluid inerter with a built-in piston rod, which comprises a cylinder barrel, a piston, a first piston rod, a second piston rod and a hinge seat, wherein the cylinder barrel is provided with a piston rod; the piston is movably arranged in an inner cavity of the cylinder barrel, a groove is formed in the surface, opposite to the inner wall of the cylinder barrel, of the piston, and a first piston rod and a second piston rod are arranged on the side walls, opposite to the piston, of the piston respectively; one end of the first piston rod is arranged in the piston, a cavity communicated with the outside atmosphere is formed between the first piston rod and the piston, and the other end of the first piston rod is fixed on the side wall of the cylinder barrel and connected with a hinge seat; one end of the second piston rod is fixed on the side wall of the piston, and the other end of the second piston rod penetrates through the side wall of the cylinder barrel and is also connected with a hinge seat. The invention can reduce the axial size of the fluid inerter, reduce the number of matching surfaces and reduce the overall assembly difficulty under the condition of keeping the original mechanical property of the fluid inerter unchanged, thereby leading the structure to be more compact and the space utilization rate to be higher.)

1. A fluid inerter with a built-in piston rod is characterized in that: the cylinder barrel, the piston, the first piston rod, the second piston rod and the hinge seat are included;

the piston is movably arranged in an inner cavity of the cylinder barrel, a groove is formed in the surface, opposite to the inner wall of the cylinder barrel, of the piston, and a first piston rod and a second piston rod are arranged on the side walls, opposite to the piston, of the piston respectively; one end of the first piston rod is arranged in the piston, a cavity communicated with the outside atmosphere is formed between the first piston rod and the piston, and the other end of the first piston rod is fixed on the side wall of the cylinder barrel and connected with a hinge seat; one end of the second piston rod is fixed on the side wall of the piston, and the other end of the second piston rod penetrates through the side wall of the cylinder barrel and is also connected with a hinge seat.

2. The inerter with a built-in piston rod of claim 1, wherein: and a first sealing ring and a second sealing ring are respectively arranged between the first piston rod and the piston and between the second piston rod and the cylinder barrel for sealing.

3. The inerter with a built-in piston rod of claim 1, wherein: the grooves on the outer walls of the piston and the cylinder barrel opposite to each other are spiral grooves.

4. The inerter with a built-in piston rod of claim 3, wherein: the spiral grooves are symmetrically and uniformly distributed along the axis of the piston.

5. The inerter with a built-in piston rod of claim 1, wherein: and a third sealing ring is arranged in a groove on the outer wall of the piston and the cylinder barrel opposite to each other for sealing, and oil ports communicated with the inner cavity are respectively arranged on the cylinder barrel and positioned at two sides of the third sealing ring.

6. The inerter with a built-in piston rod of claim 1, wherein: and the second piston rod is axially provided with an air passage communicated with the inner cavity of the piston and is radially provided with a vent hole communicated with the air passage.

7. The inerter with a built-in piston rod of claim 6, wherein: the vent hole is positioned between the second movable sealing ring and the second hinge seat.

8. The inerter with a built-in piston rod of claim 1, wherein: the first and second piston rods are located on the axis of the cylinder and piston.

Technical Field

The invention relates to the technical field of vibration reduction and isolation, in particular to a fluid inerter with a built-in piston rod.

Background

Smith, Cambridge university in 2002, proposes the concept of Inerter, and thus a novel vibration isolation theoretical system of Inerter-spring-damping is constructed. The inerter helps to solve the common problem in the field of vibration and noise reduction, and is specifically represented as follows: the inertial container has excellent vibration damping performance in the field of vehicle suspension, and the average speed of a multi-axis off-road vehicle can be greatly increased; in the vibration reduction field when the super high-rise building is attacked by earthquake or typhoon, the inertial container has the potential to replace a mass damper weighing hundreds of tons, the weight is reduced to be within 10 tons, and consumables are greatly saved; ③ inertias are also extending to other technical areas, such as: steering compensation of high-performance motorcycles, resonance suppression of large-span cables and bridges, high-speed rail suspension, aerospace and the like.

International PCT patent 201080035037.8 firstly proposes the concept of fluid inerter and gives a derivation formula of the inerter coefficient, which uses the fluid in the slender tube as the inertia generating device, and the fluid in the hydraulic cylinder flows back and forth in the left and right chambers of the piston through the external spiral tube or the spiral groove on the piston, so as to output the inertia force of the fluid flow. The fluid inerter has the following advantages: the transmission ratio is large, and huge inertia 'virtual mass' (also called inertia mass coefficient) can be obtained by using smaller fluid mass; flexible connection of fluid, pipelines and the like is adopted, so that flexible arrangement can be realized; the gap is not formed, the abrasion is small, and the service life is long; fourthly, the structure is simple and the volume is small. Therefore, the fluid inerter has the potential of large-scale popularization and application.

In order to ensure that effective acting areas on two sides of a piston of a fluid inerter are equal, a double-rod oil cylinder is generally adopted as a generating oil cylinder of the fluid inerter in the prior art. This structure is simple, but has the main drawbacks: one end of the double-outlet rod is a force output end of the inertial container, but the other end of the double-outlet rod is only used for occupying the volume in the cylinder barrel, but space is reserved for a piston rod occupying the volume during engineering design, and the axial size is increased.

Disclosure of Invention

The invention aims to solve the technical problems in the prior art, and provides a fluid inerter with a built-in piston rod, which reduces the axial size of the fluid inerter, reduces the number of matching surfaces, reduces the overall assembly difficulty, and has a more compact structure and a higher space utilization rate under the condition of keeping the original mechanical properties of the fluid inerter unchanged.

In order to solve the problems proposed above, the technical scheme adopted by the invention is as follows:

the invention provides a fluid inerter with a built-in piston rod, which comprises a cylinder barrel, a piston, a first piston rod, a second piston rod and a hinge seat, wherein the piston rod is arranged in the cylinder barrel;

the piston is movably arranged in an inner cavity of the cylinder barrel, a groove is formed in the surface, opposite to the inner wall of the cylinder barrel, of the piston, and a first piston rod and a second piston rod are arranged on the side walls, opposite to the piston, of the piston respectively; one end of the first piston rod is arranged in the piston, a cavity communicated with the outside atmosphere is formed between the first piston rod and the piston, and the other end of the first piston rod is fixed on the side wall of the cylinder barrel and connected with a hinge seat; one end of the second piston rod is fixed on the side wall of the piston, and the other end of the second piston rod penetrates through the side wall of the cylinder barrel and is also connected with a hinge seat.

Furthermore, a first sealing ring and a second sealing ring are respectively arranged between the first piston rod and the piston and between the second piston rod and the cylinder barrel for sealing.

Furthermore, the grooves on the outer walls of the piston and the cylinder barrel opposite to each other are spiral grooves.

Furthermore, the spiral grooves are symmetrically and uniformly distributed along the axis of the piston.

Furthermore, a third sealing ring is arranged in a groove on the outer wall of the piston and the cylinder barrel opposite to each other for sealing, and oil ports communicated with the inner cavity are respectively arranged on the cylinder barrel and positioned on two sides of the third sealing ring.

Further, an air passage communicated with the inner cavity of the piston is axially arranged on the second piston rod, and a vent hole communicated with the air passage is radially arranged on the second piston rod.

Further, the vent hole is located between the second dynamic sealing ring and the second hinge base.

Further, the first piston rod and the second piston rod are located on the axis of the cylinder and the piston.

Compared with the prior art, the invention has the beneficial effects that:

according to the invention, the first piston rod and the second piston rod are arranged in the cylinder barrel and are respectively matched with the piston, when the piston reciprocates in the cylinder barrel, the effective acting areas of the left and right chambers of the piston are equal, compared with a double-rod oil cylinder, one end of the first piston rod is arranged at the inner side of the piston, and under the condition of keeping the original mechanical properties of the fluid inerter unchanged, the axial size of the fluid inerter can be reduced, the number of matching surfaces is reduced, the overall assembly difficulty is reduced, the structure is more compact, and the space utilization rate is higher.

Drawings

In order to illustrate the solution of the invention more clearly, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are some embodiments of the invention, and that other drawings may be derived from these drawings by a person skilled in the art without inventive effort. Wherein:

fig. 1 is a schematic structural diagram of a first embodiment of a fluid inerter with a built-in piston rod according to the present invention.

FIG. 2 is a schematic diagram illustrating the fluid inerter being compressed to the shortest length according to an embodiment of the present invention.

FIG. 3 is a hydraulic schematic diagram illustrating the fluid inerter stretched to the longest length according to an embodiment of the present invention.

Fig. 4 is a schematic structural diagram of a second embodiment of a fluid inerter with a built-in piston rod according to the present invention.

Fig. 5 is a schematic view illustrating the fluid inerter being compressed to the shortest length in the second embodiment of the present invention.

FIG. 6 is a hydraulic schematic diagram illustrating the fluid inerter stretched to the longest length according to the second embodiment of the present invention.

The reference numerals are explained below: 1-a second hinge mount; 2-a cylinder barrel; 3-a piston; 4-spiral groove; 5-a first hinge mount; 6-first sealing ring; 7-a first piston rod; 8-a second sealing ring; 9-a second piston rod; 10-a vent hole; 11-a first oil port; 12-a third sealing ring; 13-second oil port.

Detailed Description

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs; the terminology used in the description presented herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention, e.g., the terms "length," "width," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," "outer," etc., refer to an orientation or position based on that shown in the drawings, are for convenience of description only and are not to be construed as limiting of the present disclosure.

The terms "including" and "having," and any variations thereof, in the description and claims of this invention and the description of the above figures are intended to cover non-exclusive inclusions; the terms "first," "second," and the like in the description and in the claims, or in the drawings, are used for distinguishing between different objects and not necessarily for describing a particular sequential order. In the description and claims of the present invention and in the description of the above figures, when an element is referred to as being "fixed" or "mounted" or "disposed" or "connected" to another element, it may be directly or indirectly located on the other element. For example, when an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element.

Furthermore, reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the invention. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

Referring to fig. 1, the fluid inerter with a built-in piston rod comprises a cylinder 2, a piston 3, a first piston rod 7, a second piston rod 9 and a hinge seat.

The piston 3 is movably arranged in the inner cavity of the cylinder barrel 2, a groove is formed in the surface, opposite to the inner wall of the cylinder barrel 2, of the piston 3, and a first piston rod 7 and a second piston rod 9 are arranged on the side walls, opposite to the piston 3, respectively. One end of the first piston rod 7 penetrates through the side wall of the piston 3 and is arranged inside the piston 3, a cavity communicated with the outside atmosphere is formed between the first piston rod and the piston 3, and the other end of the first piston rod 7 is fixed on the side wall of the cylinder barrel 2 and is connected with a hinge seat. One end of the second piston rod 9 is fixed on the side wall of the piston 3, and the other end of the second piston rod penetrates through the side wall of the cylinder barrel 2 and is also connected with a hinge seat.

In this embodiment, an end of the first piston rod 7 is connected to the first hinge base 5, and an end of the second piston rod 9 is connected to the second hinge base 1. The second hinge base 1 and the first hinge base 5 are respectively connected with two parts which vibrate relatively. The piston 3 can drive the second piston rod 9 to do reciprocating linear motion in the cylinder barrel 2 along the axis, and a cavity is formed between the first piston rod 7 and the piston 3 and is communicated with the outside atmosphere.

Further, sealing rings are provided between the first piston rod 7 and the piston 3 and between the second piston rod 9 and the cylinder 2 for sealing. Specifically, a first sealing ring 6 is arranged between the first piston rod 7 and the cylinder barrel 2, and a second dynamic sealing ring 8 is arranged between the second piston rod 9 and the cylinder barrel 2, so that dynamic sealing between the first piston rod 7 and the piston 3 and between the second piston rod 9 and the cylinder barrel 2 is realized.

In an embodiment of the present invention, as shown in fig. 1, the grooves on the opposite outer walls of the piston 3 and the cylinder 2 are spiral grooves 4, and when two hinge bases, namely the second hinge base 1 and the first hinge base 5, move relatively, the piston 3 forces the fluid in the cylinder 2 to pass through the spiral grooves 4 and to flow back and forth at high speed on the left and right sides of the piston 3, thereby achieving encapsulation of the inertial force of the fluid.

Furthermore, the spiral grooves 4 are symmetrically and uniformly distributed along the axis of the piston 3, so that the piston 3 can reliably reciprocate.

Fig. 2 shows the state that the inerter is compressed to the shortest length in this embodiment, and the vent hole 10 is close to the side surface of the second seal ring 8 when the compressed to the shortest length, and the first piston rod 7 and the piston 3 do not generate motion interference.

Fig. 3 shows the fluid inerter in the present embodiment stretched to the longest position, which ensures that the first piston rod 7 is not disengaged from the piston 3.

In this embodiment, through set up the helicla flute on piston 3 to set up the one end of first piston rod 7 in piston 3's inside, utilized piston 3's axial dimensions, through the relative slip between first piston rod 7 and the piston 3, guarantee that the effective area of piston 3 both sides equals, improved holistic integrated level, reduced the quantity of fitting surface, reduced the technology degree of difficulty, also reduced overall structure's axial dimensions.

In another embodiment of the present invention, referring to fig. 4, a third sealing ring 12 is disposed in a groove on the outer wall of the piston 3 to realize dynamic sealing between the piston 3 and the cylinder 2. Oil ports, namely a first oil port 11 and a second oil port 13, which are communicated with the inner cavity are respectively arranged on the cylinder barrel 2 and positioned on two sides of the third sealing ring 12 on the piston 3.

Further, the first oil port 11 corresponds to the second piston rod 9, and the second oil port 13 corresponds to the first piston rod 7. An external spiral pipeline is adopted to connect the first oil port 11 and the second oil port 13, when two hinge bases, namely the second hinge base 1 and the first hinge base 5, move relatively, the piston 3 forces fluid in the cylinder barrel 2 to flow back and forth at high speed on the left side and the right side of the piston 3 through the first oil port 11, the second oil port 13 and the spiral pipeline between the first oil port and the second oil port, and therefore encapsulation of fluid inertia force is achieved.

Fig. 5 shows the state that the fluid inerter is compressed to the shortest in the present embodiment, and when the fluid inerter is compressed to the shortest, the leftmost side of the vent hole 10 is located at the left side of the cylinder 2, and the first piston rod 7 and the piston 3 do not have motion interference.

Fig. 6 shows the fluid inerter in this embodiment stretched to the longest position, which ensures that the first piston rod 7 is not disengaged from the piston 3.

In this embodiment, the third sealing ring 12 is arranged between the outer wall of the piston 3 and the cylinder barrel 2, and the oil ports are arranged on the cylinder barrel 2, so that the distance between the first oil port 11 and the second oil port 14 can be increased, and a larger space is reserved for the arrangement of an external pipeline.

Further, the second piston rod 9 is provided with an air passage communicated with the inner cavity of the piston 3 along the axial direction thereof, and is provided with a vent hole 10 communicated with the air passage along the radial direction, so that the cavity in the piston 3 is conveniently and reliably communicated with the external atmosphere.

Further, the vent hole 10 is located between the second sealing ring 8 and the second hinge base 1, so that the cavity in the piston 3 can be communicated with the external atmosphere.

Furthermore, the first piston rod 7 and the second piston rod 9 are located on the axes of the cylinder 2 and the piston 3, so that the first piston rod 7 and the second piston rod 9 can reliably drive the piston 3 to reciprocate.

Further, the first seal ring 6, the second seal ring 8 and the third seal ring 12 may be O-rings, combined seal rings or a series connection of various seal rings.

According to the fluid inerter with the built-in piston rod, one end of the first piston rod 7 is arranged in the piston 3, and the axial size of the piston 3 is utilized, so that the overall axial size of the fluid inerter is reduced. In addition, the other end of the first piston rod 7 is fixed on the side wall of the cylinder barrel 2, so that the matching surfaces between the piston 3 and the cylinder barrel 2 are changed from three matching surfaces (matching between the first piston rod 7, the second piston rod 9 and the two ends of the cylinder barrel 2 and matching between the piston 3 and the inner wall of the cylinder barrel 2) to two matching surfaces (matching between the second piston rod 9 and the cylinder barrel 2 and matching between the piston 3 and the inner wall of the cylinder barrel 2), the requirements on the coaxiality and the roundness of the matching surfaces between the piston 3 and the cylinder barrel 2 are reduced, the yield is also reduced, and the manufacturability is greatly improved.

The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.