CN113251101A

CN113251101A - Elliptical ring vibration isolator

Info

Publication number: CN113251101A
Application number: CN202110521171.9A
Authority: CN
Inventors: 牛牧青; 韩文举; 陆泽琦; 陈立群
Original assignee: Harbin Institute of Technology Shenzhen
Current assignee: Harbin Institute of Technology Shenzhen
Priority date: 2021-05-13
Filing date: 2021-05-13
Publication date: 2021-08-13

Abstract

The present application provides an elliptical ring vibration isolator, which includes an elastic vibration isolator and a guide mechanism. The elastic vibration isolator is an elliptical ring structure, and the parts on the elastic vibration isolator at both ends of the short axis of the ellipse are set as a free end and a fixed end, the free end is used to connect the vibration isolator, and the fixed Ends are used to connect the base. The guiding mechanism includes a moving piece that can move linearly, the moving piece is connected with the free end, and the movement track of the moving piece coincides with the short axis of the ellipse. Compared with the prior art, the elliptical ring vibration isolator in the present application has the advantages of simple structure, compactness and convenient installation. At the same time, the present application can adjust the elliptical eccentricity of the elastic vibration isolator. Effective vibration isolation in the low frequency region.

Description

Elliptical ring vibration isolator

Technical Field

The application relates to the technical field of vibration dampers, in particular to a nonlinear vibration isolator.

Background

Linear vibration isolators having an external excitation frequency greater than the natural frequency of the isolator

While providing good vibration isolation, the excitation (e.g. oscillation or vibration) involves dangerous low frequency componentsIn volume, the use of linear isolators would be limited. The nonlinear vibration isolator can achieve good low-frequency vibration suppression, but the existing nonlinear vibration isolator is complex in structure, and the size of the required vibration isolator is large when ultra-low-frequency vibration isolation is achieved.

Disclosure of Invention

The application provides an elliptical ring vibration isolator to solve among the prior art nonlinear vibration isolator structure more complicated, the problem that the volume ratio of required vibration isolator is great when realizing ultralow frequency vibration isolation.

In order to solve the above problems, the technical scheme provided by the application is as follows: an elliptical ring vibration isolator comprises an elastic vibration isolating piece and a guide mechanism. The elastic vibration isolation piece is of an elliptical ring-shaped structure, the parts, located at two ends of the elliptical short shaft, of the elastic vibration isolation piece are set to be a free end and a fixed end, the free end is used for being connected with a vibration-isolated object, and the fixed end is used for being connected with a foundation. The guide mechanism comprises a moving piece capable of moving linearly, the moving piece is connected with the free end, and the motion track of the moving piece is superposed with the elliptical short shaft.

When the elliptical ring vibration isolator is used, two ends of the elastic vibration isolating piece, namely a free end and a fixed end, are respectively connected to a vibration-isolated object and a foundation, the elastic vibration isolating piece supports the vibration-isolated object, the free end is driven to generate vertical vibration when the vibration-isolated object generates vertical vibration, and the elastic vibration isolating piece converts the vibration energy of the vibration-isolated object into the internal energy of the elastic vibration isolating piece which is emitted into the air in a heat mode, so that the energy consumption and vibration isolation effects are achieved; meanwhile, in order to ensure that the free end of the elastic vibration isolation piece only vibrates vertically so as to avoid the transverse deviation of the free end and prevent the free end from driving the vibration-isolated object to generate the transverse deviation, the additionally arranged guide mechanism can vertically guide the free end and the vibration-isolated object so that the vibration-isolated object only vibrates vertically to improve the stability of the vibration-isolated object; the elastic vibration isolation piece is of an elliptical ring-shaped structure, the ellipticity eccentricity can be changed, namely the ellipticity flattening degree is changed, the elastic vibration isolation piece is further adaptive to multi-range ultralow frequency vibration, and the application range is wide.

Compared with the prior art, the elliptical ring vibration isolator has the advantages of simple and compact structure, convenience in installation and the like, and meanwhile, effective vibration isolation can be realized in an ultralow frequency area contained in excitation through adjusting the elliptical eccentricity of the elastic vibration isolation piece.

In one possible design, the free end is connected to the vibration-isolated object through the moving part.

In a possible design, the free end is provided with a first connecting hole, and the moving member is inserted and fixed in the first connecting hole.

In one possible design, the moving member has a flange, and the flange is fixed to the vibration-isolated object by a bolt.

In a possible design, the guiding mechanism further includes a guiding rod, and the moving member is slidably sleeved on the guiding rod.

In one possible embodiment, the fastening end is connected to the base via the guide rod.

In a possible design, the second connecting hole is seted up to the stiff end, the guide bar have first screw rod portion and with the spacing platform that first screw rod portion is connected, wear to establish in the second connecting hole first screw rod portion, first screw rod portion is screwed up the nut in order with the stiff end compresses tightly extremely spacing bench.

In one possible embodiment, the guide rod has a second threaded portion for the threaded connection to the base.

In one possible embodiment, the displacement element is a sliding linear bearing or a ball linear bearing.

In a possible design, the material of the elastic vibration isolation member includes a metal or non-metal material.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

Fig. 1 is a sectional view of an elliptical ring vibration isolator according to an embodiment of the present invention;

fig. 2 is an exploded view of the elliptical ring vibration isolator according to an embodiment of the present invention.

Reference numerals: 10. an elastic vibration isolating member; 11. a free end; 12. a fixed end; 20. a guide mechanism; 21. a moving member; 211. a flange; 22. a guide bar; 221. a first screw section; 222. a limiting table; 223. a nut; 224. a second screw section; 30. an object to be isolated.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise. In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description of the present application, it is to be understood that the terms "inner," "outer," "upper," "bottom," "front," "back," and the like, when used in the orientation or positional relationship indicated in FIG. 1, are used solely for the purpose of facilitating a description of the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the present application.

It should be noted that the same reference numerals are used to denote the same components or parts in the embodiments of the present application, and for the same parts in the embodiments of the present application, only one of the parts or parts may be given the reference numeral, and it should be understood that the reference numerals are also applicable to the other same parts or parts.

Vibration isolation can be divided into two categories depending on the source of the vibration. For equipment which is itself a vibration source, in order to reduce its effect on surrounding machinery, equipment and buildings, it is isolated from the support in order to reduce the unbalanced inertial forces imparted to the support, known as active vibration isolation. Vibration isolation for water pumps, engines, hammer machines, and the like is a category. The positive vibration isolation coefficient indicates a positive vibration isolation effect; it is equal to the force imparted to the foundation after vibration isolation divided by the force imparted to the support without vibration isolation. In the case of vibration source from support vibration, in order to reduce the transmission of external vibration into the system, the system is installed on a vibration-isolated pedestal to isolate it from the ground, and this measure is called passive vibration isolation, also called passive vibration isolation. The vehicle seats, the installation of precise instruments, the packaging of environmental transportation, the vibration isolation of missile launcher on naval vessels and the like belong to the category. The passive vibration isolation factor represents the passive vibration isolation effect, which is equal to the amplitude of the machine equipment divided by the amplitude of the support motion after vibration isolation. This application pertains to passive vibration isolation.

According to the vibration isolation theory, the traditional linear vibration isolation system can better isolate medium-frequency and high-frequency vibration, but has poor capability of isolating low-frequency vibration, particularly ultra-low-frequency vibration. The nonlinear vibration isolator can realize good low-frequency vibration suppression, but the structure of the existing nonlinear vibration isolator is complex, and the volume of the required vibration isolator is large when ultralow-frequency vibration isolation is realized.

The embodiment provides an elliptical ring vibration isolator, which can solve the problem that the structure of a nonlinear vibration isolator is complex in the prior art, and the size of the vibration isolator is small when ultralow frequency vibration isolation is realized.

As shown in fig. 1-2, the technical solution provided in this embodiment is: an elliptical ring vibration isolator includes an elastic vibration isolator 10 and a guide mechanism 20. The elastic vibration isolation piece 10 is an elliptical ring-shaped structure, the parts of the elastic vibration isolation piece 10, which are positioned at two ends of the elliptical short axis, are set as a free end 11 and a fixed end 12, the free end 11 is used for connecting the object to be isolated 30, and the fixed end 12 is used for connecting the foundation. The guide mechanism 20 comprises a moving member 21 capable of moving linearly, the moving member 21 is connected with the free end 11, and the motion track of the moving member 21 is coincident with the minor axis of the ellipse.

The elastic vibration isolator 10 in this embodiment is made of a metal or non-metal material having elasticity and flexibility. Specifically, the strip-shaped metal plate or the polymer material plate is bent and then connected end to form the elliptical elastic vibration isolating member 10 in this embodiment.

The elliptical ring vibration isolator in the application is used, two ends of the elastic vibration isolation piece 10, namely the free end 11 and the fixed end 12, are respectively connected to the object to be subjected to vibration isolation 30 and the foundation, at the moment, the elastic vibration isolation piece 10 plays a supporting role on the object to be subjected to vibration isolation 30, when the object to be subjected to vibration isolation 30 generates vertical vibration, the free end 11 is driven to generate vertical vibration, at the moment, the elastic vibration isolation piece 10 converts the vibration energy of the object to be subjected to vibration isolation 30 into internal energy of the elastic vibration isolation piece 10, and the internal energy is dissipated into the air in a heat mode, so that the effects of energy consumption and vibration isolation are achieved; meanwhile, in order to make the free end 11 of the elastic vibration isolation member 10 vibrate only in the vertical direction, so as to avoid the transverse deviation of the free end 11 and prevent the free end 11 from driving the vibration isolated object 30 to generate the transverse deviation, the additional guide mechanism 20 can vertically guide the free end 11 and the vibration isolated object 30, so that the vibration isolated object 30 only vibrates in the vertical direction, and the stability of the vibration isolated object 30 is improved; the elastic vibration isolation piece 10 is an elliptical ring-shaped structure, and can adapt to multi-range ultralow frequency vibration by changing the eccentricity of an ellipse, namely changing the flattening degree of the ellipse, so that the application range is wide.

Wherein, the eccentricity of the ellipse refers to: eccentricity, which is defined as the ratio of the distance between two foci of an ellipse to the length of the major axis, is a measure of the degree of flattening of the ellipse, and can be understood visually as the degree to which two foci are off-center, provided the major axis of the ellipse is constant.

Compared with the prior art, the elliptical ring vibration isolator has the advantages of simple and compact structure, convenience in installation and the like, and meanwhile, effective vibration isolation can be realized in an ultralow frequency area contained in excitation through adjusting the elliptical eccentricity of the elastic vibration isolating piece 10.

As shown in fig. 1-2, in one embodiment, the free end 11 is connected to the object 30 via a moving member 21.

The free end 11 may be directly connected to the object 30 to be vibration-isolated, or may be indirectly connected to the object 30 to be vibration-isolated via the moving member 21.

The guide mechanism 20 in the present embodiment may be a linear bearing assembly, a linear guide assembly, a rack and pinion assembly, or the like that can perform linear motion. Thus, the moving member 21 may be a linear bearing, a slider, a gear, or the like.

It should be noted that, when the guiding mechanism 20 is a linear guide rail assembly, in order to avoid the unidirectional stress of the slider and the locking of the slider in the guide rail, two linear guide rail assemblies need to be symmetrically arranged, so that the stress of the free end 11 when being guided by the slider can be balanced, and the locking condition can be avoided, and the free end 11 and the vibration-isolated object 30 are connected between two oppositely arranged sliders during installation.

In addition, when the guide mechanism 20 is a rack and pinion assembly, the gear rotates while moving linearly along the longitudinal direction of the rack, and therefore, a bearing needs to be additionally provided at the connection point between the gear and the free end 11 or the vibration-damping object 30.

As shown in fig. 1-2, in one embodiment, the free end 11 defines a first connecting hole, and the first connecting hole is disposed through and fixed to the moving member 21.

As mentioned above, the free end 11 can be indirectly connected to the vibration isolator 30 through the moving member 21, the connection between the free end 11 and the moving member 21 can be various, and the edge of the free end 11 is connected to the moving member, or in this embodiment, the free end 11 is provided with a hole through which the moving member 21 is inserted. In this embodiment, the connection between the moving member 21 and the free end 11 is changed from "point connection" to "line connection" by the way of perforating the moving member 21, so that the connection strength between the two can be improved.

As shown in fig. 1-2, in one embodiment, the moving member 21 has a flange 211, and the flange 211 is fixed to the vibration insulator 30 by bolts.

The shape of the moving member 21 is similar to that of a flange part of a chemical pipeline, a plurality of mounting holes are formed in the flange 211 along the circumferential direction of the flange, a plurality of mounting holes are formed in the corresponding vibration isolator 30, the flange 211 and the vibration isolator 30 are fixedly connected through bolts, and then the moving member 21 is connected with the vibration isolator 30.

As shown in fig. 1-2, in one embodiment, the guiding mechanism 20 further includes a guiding rod 22, and the guiding rod 22 is slidably sleeved on the moving member 21.

As mentioned above, the guiding mechanism 20 may be a linear bearing assembly, so that the guiding mechanism 20 further includes a guiding rod 22, the moving member 21 is a linear bearing, and the outer portion of the guiding rod 22 is slidably sleeved on the moving member 21.

As shown in fig. 1-2, in one embodiment, the fixed end 12 is connected to the base by a guide rod 22.

The fixed end 12 may be directly connected to the base or indirectly connected to the base through the guide rod 22. In this embodiment, the fixed end 12 is connected to the base by a guide rod 22.

As shown in fig. 1-2, in one embodiment, the fixing end 12 is provided with a second connecting hole, the guide rod 22 has a first screw portion 221 and a limit stop 222 connected to the first screw portion 221, the first screw portion 221 is inserted into the second connecting hole, and the first screw portion 221 is screwed with a nut 223 to press the fixing end 12 onto the limit stop 222.

As mentioned above, the fixed end 12 is indirectly connected with the foundation through the guide rod 22, the connection mode between the fixed end 12 and the guide rod 22 can be various, and the edge of the fixed end 12 is connected with the guide rod 22, or in this embodiment, the fixed end 12 is provided with a hole through which the guide rod 22 passes. In this embodiment, the guide rod 22 is inserted through the hole, so that the connection between the guide rod 22 and the fixed end 12 is changed from "point connection" to "line connection", thereby improving the connection strength between the two.

Still further, the guide rod 22 has a first screw portion 221 and a limit stand 222 connected to the first screw portion 221, the first screw portion 221 is inserted into the second connecting hole, and the nut 223 is screwed on the first screw portion 221 to press the fixed end 12 onto the limit stand 222. Therefore, the connection position of the guide rod 22 and the fixed end 12 is changed from 'line connection' to 'surface connection', and the connection strength between the two is further improved.

As shown in fig. 1-2, in one embodiment, the guide bar 22 has a second screw portion 224 for threaded connection with a base.

The guide rod 22 and the foundation can be connected in various ways, such as welding, adhesive bonding, and the like, but the several ways are all non-detachable connection ways, so that maintenance and replacement of parts are not facilitated. Therefore, in order to solve this problem, the connection manner of the guide rod 22 and the foundation may be designed to be a detachable connection manner, specifically, the bottom of the guide rod 22 is provided with a second screw portion 224, the foundation is provided with a screw hole, and the guide rod 22 is screwed into the screw hole through the second screw portion 224.

In one embodiment, the moving member 21 is a sliding linear bearing or a ball linear bearing.

The ball linear bearing is a linear motion system for linear travel in cooperation with the guide rod 22. Because the bearing ball is in point contact with the bearing outer sleeve, the steel ball rolls with the minimum friction resistance, so that the linear bearing has small friction and is relatively stable, does not change along with the speed of the bearing, and can obtain stable linear motion with high sensitivity and high precision.

The sliding linear bearing is a linear motion system with self-lubricating property, and the biggest difference between the sliding linear bearing and the ball linear bearing is that the ball linear bearing is in rolling friction, and the bearing is in point contact with the guide rod 22; the sliding linear bearing is sliding friction, and the bearing is in surface contact with the guide rod 22.

Further, the sliding linear bearing can be classified into a hydrodynamic lubrication bearing (also called a hydrodynamic bearing) and a hydrostatic bearing (also called a hydrostatic bearing) according to the difference of the principle of forming the oil film on the two relatively moving surfaces of the sliding linear bearing. Fluid dynamic pressure lubricated bearings are commonly used which carry the load by bringing oil between the two surfaces by relative movement of the bearing and the guide rod 22 to form a sufficient pressure film to separate the two surfaces. Under the condition of liquid lubrication, the sliding surface is separated by lubricating oil without direct contact, the friction loss and the surface abrasion can be greatly reduced, and the oil film also has certain vibration absorption capacity. In addition to reducing the frictional resistance between the bearing and the guide rod 22 by the lubricating oil, the sliding linear bearing may be coated inside with a bearing alloy, wear-resistant cast iron, copper-and aluminum-based alloys, powder metallurgy materials, plastics, rubber, hardwood and carbon-graphite, polytetrafluoroethylene, modified polyoxymethylene, etc. to reduce the frictional resistance between the two by the self-lubricating material itself.

In one embodiment, the material of the resilient vibration isolator 10 includes a metallic or non-metallic material.

As mentioned above, the material of the elastic vibration isolating member 10 may be metal, such as copper, iron, aluminum, tin, silver, etc. The elliptical elastic vibration isolating piece 10 in the present application can be formed by casting and integral molding, and can also be formed by welding the bent metal plates end to end.

The material of the elastic vibration insulator 10 may be a non-metal material, such as High Density Polyethylene (HDPE), polyhexamethylene adipamide (nylon-66), polypropylene (PP), epoxy resin containing kevlar (82 vol%), epoxy resin containing glass fiber (73.3 vol%), or the like. The elliptical elastic vibration isolating piece 10 in the present application can be integrally formed by an injection molding process, and can also be formed by bonding the plates made of the non-metallic materials end to end after bending or by hot melting connection.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. An elliptical ring vibration isolator comprising:

the elastic vibration isolation piece (10) is of an elliptical ring-shaped structure, the parts, located at two ends of an elliptical short shaft, of the elastic vibration isolation piece (10) are set to be a free end (11) and a fixed end (12), the free end (11) is used for being connected with a vibration-isolated object (30), and the fixed end (12) is used for being connected with a foundation; the guide mechanism (20), but guide mechanism (20) includes moving member (21) of rectilinear motion, moving member (21) with free end (11) are connected, and the motion trail of moving member (21) with the ellipse minor axis coincidence.

2. The elliptical ring vibration isolator as claimed in claim 1, wherein said free end (11) is connected to said object (30) to be isolated by said moving member (21).

3. The elliptical ring vibration isolator according to claim 2, characterized in that the free end (11) is provided with a first connecting hole through which the moving member (21) is inserted and fixed.

4. The elliptical ring vibration isolator as claimed in claim 2, wherein the moving member (21) has a flange (211), and the flange (211) is fixed to the object (30) by bolts.

5. The elliptical ring vibration isolator according to claim 1, characterized in that the guide mechanism (20) further comprises a guide rod (22), and the guide rod (22) is slidably fitted over the moving member (21).

6. The elliptical ring vibration isolator of claim 5 wherein the fixed end (12) is connected to the base by the guide rod (22).

7. The elliptical ring vibration isolator according to claim 6, wherein the fixed end (12) is provided with a second connecting hole, the guide rod (22) has a first screw portion (221) and a limit table (222) connected with the first screw portion (221), the first screw portion (221) is arranged in the second connecting hole in a penetrating manner, and a nut (223) is screwed on the first screw portion (221) to press the fixed end (12) onto the limit table (222).

8. The elliptical ring vibration isolator according to claim 6, characterized in that the guide rod (22) has a second screw portion (224) for threaded connection with the foundation.

9. The elliptical ring vibration isolator according to claim 5, characterized in that the moving member (21) is a sliding linear bearing or a ball linear bearing.

10. The elliptical ring vibration isolator according to claim 1, characterized in that the material of the resilient vibration isolator (10) comprises a metallic or non-metallic material.