CN216242026U

CN216242026U - Vibration reduction limiting device and mechanical equipment with same

Info

Publication number: CN216242026U
Application number: CN202121962657.8U
Authority: CN
Inventors: 鲁涵锋; 张龙爱; 周江峰; 冯新园; 范风强
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2021-08-19
Filing date: 2021-08-19
Publication date: 2022-04-08
Anticipated expiration: 2031-08-19

Abstract

The utility model provides a vibration-damping limiting device and mechanical equipment with the same, relates to the technical field of vibration damping, and solves the technical problem that a vibration-isolating foot pad of the equipment cannot simultaneously give consideration to a good vibration-isolating effect and a good impact-resisting limiting function. The vibration reduction limiting device comprises a vibration isolation structure, a supporting structure, and a vertical limiting structure and a horizontal limiting structure which are arranged on the supporting structure. When the vibration isolation structure is used for reducing vibration, the vertical limiting structure and the horizontal limiting structure are limited, so that the vibration isolation structure has a good equipment limiting function when vibration or impact occurs in an installation environment, displacement is generated only in a set small range, and a pipeline system attached to equipment is prevented from being damaged due to overlarge relative displacement, so that the safety and the reliability of the operation of mechanical equipment are improved.

Description

Vibration reduction limiting device and mechanical equipment with same

Technical Field

The utility model relates to the technical field of vibration reduction, in particular to a vibration reduction limiting device and mechanical equipment with the same.

Background

Mechanical equipment always generates characteristic frequency vibration related to the working principle of the mechanical equipment during operation, such as the rotating frequency of a rotating machine and harmonic frequencies of the rotating machine. While a plurality of mechanical devices will have piping systems attached to them. Mechanical equipment is generally required to have low vibration transmissibility to the installation environment and good adaptability and reliability to environmental vibration and impact. Mechanical equipment generally adopts the damping of machine foot rubber pad, fixes the restraint to equipment in order to resist environmental vibration and impact through the support with unit frame rigid connection.

Taking a vehicle-mounted air conditioner compressor as an example, not only the vibration transmitted to an external shell by the compressor is reduced, but also the compressor cannot generate overlarge displacement in the vehicle-mounted vibration and impact environment so as to avoid damaging a pipeline system. In order to make the compressor have higher vibration isolation effect, the softer material is chooseed for use to the compressor rubber pad, but this can lead to the undercarriage rubber pad to the compressor at vehicle-mounted environmental vibration and impact condition under bracing not enough and the displacement great, and the pipeline takes place to destroy, perhaps the rubber pad self produces very fast wearing and tearing, short service life under the big displacement effect of compressor three directions.

In order to solve this problem, the prior art provides an elastic mounting foot pad for a compressor, which provides elastic support for the compressor by providing a mounting cavity filled with liquid or gas in the elastic foot pad to perform vibration isolation. However, the device can be only used in a steady-state environment to reduce the vibration transmission of the compressor to the installation environment, and when the installation environment (such as a vehicle) vibrates, the device does not have a limiting function on the compressor due to the lower supporting rigidity of the gas/liquid installation cavity. Meanwhile, liquid or gas is used in the device, the requirement on the sealing performance of the device is high, and the reliability is poor.

Therefore, the vibration isolation foot pad in the prior art cannot simultaneously give consideration to a good vibration isolation effect and an impact resistance limiting function.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a vibration reduction limiting device and mechanical equipment with the same, and at least solves the technical problem that a vibration isolation foot pad of equipment in the prior art cannot simultaneously give consideration to a good vibration isolation effect and a good impact resistance limiting function. The technical effects that can be produced by the preferred technical scheme in the technical schemes provided by the utility model are described in detail in the following.

In order to achieve the purpose, the utility model provides the following technical scheme:

the utility model provides a vibration damping limiting device, which comprises:

a support structure for securing the device to a mounting surface;

the vertical limiting structure is arranged on the supporting structure, and can perform inelastic collision with the machine leg on the upper side and the lower side of the machine leg of the equipment when vibration or impact occurs so as to limit the movement of the equipment vertical to the mounting surface;

the horizontal limiting structure is at least partially mounted on the supporting structure and can be arranged on the peripheral side of the equipment, and the horizontal limiting structure can limit the equipment to move parallel to the mounting surface when vibration or impact occurs;

the vibration isolation structure includes a rigid elastic member that absorbs vibration by elastic deformation.

Optionally, the support structure includes a support and a limiting seat which are arranged in a split manner, the vibration isolation structure is arranged on the upper side of the support, and the support is detachably connected with the machine leg through a stud.

Optionally, the vibration isolation structure further includes an adjustment device provided above the elastic member and capable of adjusting a deformation amount of the elastic member.

Optionally, the elastic component is a spring, and the adjusting device comprises a spring gland and a spring nut; the spring is sleeved on the stud, and the bottom end of the spring abuts against the bracket; the spring gland is arranged at the top end of the spring and is matched with the stud to realize compression and fixation through the spring nut.

Optionally, the vibration isolation structure further includes a sleeve, the spring is a coil spring, and the sleeve is sleeved on the stud and is filled in a gap between the coil spring and the stud.

Optionally, the bracket comprises two vertical faces perpendicular to each other, and an upper portion of each vertical face is bent inwards to form an upper flat plate parallel to the mounting surface.

Optionally, the bottom of each vertical face is bent outwards to form a lower flat plate parallel to the mounting surface.

Optionally, the vertical limiting structure comprises an upper limiting block and a lower limiting block, the upper limiting block is arranged on the support, the lower limiting block is arranged on the limiting seat, and the upper limiting block and the lower limiting block are respectively located on the upper side and the lower side of the machine leg.

Optionally, the upper limiting block is a stepped cylinder with a through hole penetrating through the center; the support is provided with an upper fixing hole, the excircle of the raised step of the upper limiting block is matched with the inner circle of the upper fixing hole, and the upper limiting block is in limiting connection with the stud through the through hole.

Optionally, the upper limiting block and/or the lower limiting block are made of damping materials.

Optionally, horizontal limit structure includes lantern ring and leaf spring, the leaf spring install in spacing seat, the lantern ring is used for installing in the equipment outside, just the excircle of lantern ring with the interior circle phase-match of leaf spring.

Optionally, the plate spring is a dual-stiffness plate spring, and includes a first plate spring and a second plate spring that are fixedly connected, and the stiffness of the first plate spring is different from the stiffness of the second plate spring.

Optionally, the curvature radius of the first plate spring piece and the curvature radius of the second plate spring piece are both in a gradual change manner

Optionally, the second plate spring piece is located close to the limiting seat, and the first plate spring piece is located far away from the limiting seat.

Optionally, at least an outer surface of the collar is manufactured from a damping material.

The utility model provides mechanical equipment which comprises any one of the vibration damping and limiting devices.

Optionally, the mechanical device is a compressor.

The utility model provides a vibration damping limiting device and mechanical equipment with the same. When the vibration isolation structure is used for reducing vibration, the vertical limiting structure and the horizontal limiting structure are limited, so that the vibration isolation structure has a good equipment limiting function when vibration or impact occurs in an installation environment, displacement is generated only in a set small range, and a pipeline system attached to equipment is prevented from being damaged due to overlarge relative displacement, so that the safety and the reliability of the operation of mechanical equipment are improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic perspective view of a mechanical apparatus with a vibration damping and limiting device according to an embodiment of the present invention;

FIG. 2 is a partially enlarged schematic view of the vibration damping and limiting device of FIG. 1;

FIG. 3 is a schematic diagram of a central cross-sectional structure of a mechanical device provided with a vibration damping and limiting device according to an embodiment of the present invention;

FIG. 4 is a partially enlarged schematic view of the vibration damping and limiting device in FIG. 3;

fig. 5 is a schematic structural diagram of a compressor according to an embodiment of the present invention, in which an explosion structure of the vibration damping and limiting device is shown.

In the figure, 100, a vibration-damping impact-resisting limiting device; 1. a base plate; 2. a support; 3. a nut is arranged on the bottom plate; 4. mounting bolts on the bottom plate; 5. a limiting seat; 6. a leaf spring screw; 7. a lower limiting block; 8. an upper limit block; 9. a coil spring; 10. a sleeve; 11. a spring gland; 12. a spring nut; 13. an elastic pad; 14. a foot stud; 15. a compressor; 16. a dual-stiffness leaf spring; 17. a collar.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the utility model, and not restrictive of the full scope of the utility model. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.

Example 1:

the utility model provides a vibration-damping impact-resistant limiting device 100, which comprises:

a support structure for securing the device to a mounting surface;

the horizontal limiting structure is at least partially mounted on the supporting structure and can be arranged on the peripheral side of the equipment to limit the equipment from moving parallel to the mounting surface when vibration or impact occurs;

Optionally, the support structure comprises a support 2 and a limiting seat 5 which are arranged in a split mode, the vibration isolation structure is arranged on the upper side of the support 2, and the support 2 is detachably connected with the machine leg through a stud.

When vibration or impact occurs, the vibration isolation structure absorbs the vibration, and meanwhile due to the limit of the vertical limit structure and the horizontal limit structure, when the vibration or impact occurs in the installation environment, the vibration isolation structure has a good equipment limit function, only generates displacement within a set small range, and ensures that a pipeline system attached to equipment is not damaged due to overlarge relative displacement, so that the safety and the reliability of the operation of mechanical equipment are improved.

Alternatively, the vibration isolation structure may further include an adjustment device provided above the elastic member and capable of adjusting a deformation amount of the elastic member. The compression capacity of each foot spring of length adjustment of accessible nut screw in bolt is guaranteed by the vertical or level of damping equipment gesture to reduce all directions vibration coupling, thereby stopped traditional rubber vibration isolation callus on the sole when equipment focus is eccentric, difficult rubber callus on the sole deflection of adjusting, thereby equipment gesture is bad (slope), easily causes the problem of the coupling of all directions vibration.

As an alternative embodiment, the elastic component is a spring, and the adjusting device comprises a spring gland 11 and a spring nut 12; the spring is sleeved on the stud, and the bottom end of the spring is propped against the bracket 2; the spring gland 11 is arranged at the top end of the spring and is pressed and fixed through the matching of the spring nut 12 and the stud.

As an optional implementation manner, the vibration isolation structure further includes a sleeve 10, the spring is a coil spring 9, and the sleeve 10 is sleeved on the stud and is stuffed in a gap between the coil spring 9 and the stud. The sleeve 10 can reduce the swing of the coil spring 9 to some extent without affecting the spring deformation.

As an alternative embodiment, the bracket 2 includes two vertical surfaces, and the upper portion of each vertical surface is bent inward to form an upper flat plate parallel to the mounting surface, so as to be conveniently connected with the upper limiting block 8 and the coil spring 9 in a matching manner.

As an optional embodiment, the bottom of each vertical face is bent outwards to form a lower flat plate parallel to the mounting face and used for being fixedly connected with the mounting face.

As an optional implementation manner, the vertical limiting structure includes an upper limiting block 8 and a lower limiting block 7, the upper limiting block 8 is disposed on the bracket 2, the lower limiting block 7 is disposed on the limiting seat 5, and the upper limiting block 8 and the lower limiting block 7 are respectively located at the upper side and the lower side of the machine leg, so as to perform a vertical limiting function on the machine leg.

As an optional embodiment, the upper limiting block 8 is a step-shaped cylinder with a through hole penetrating through the center; an upper fixing hole is formed in the support 2, the excircle of the protruding step of the upper limiting block 8 is matched with the inner circle of the upper fixing hole, and the upper limiting block 8 is in limiting connection with the stud through a through hole.

As an alternative embodiment, the upper and/or lower stop blocks 8, 7 are made of damping material, which increases the energy consumption in case of a collision.

As an alternative embodiment, the horizontal limiting structure comprises a collar 17 and a plate spring, the plate spring is mounted on the limiting seat 5, the collar 17 is used for being mounted on the outer side of the device, and the outer circle of the collar 17 is matched with the inner circle of the plate spring, so that the limiting effect is achieved when the mechanical device is displaced along the radial horizontal direction of the mechanical device.

As an optional embodiment, the plate spring is a double-rigidity plate spring 16, and includes a first plate spring and a second plate spring which are fixedly connected, and the rigidity of the first plate spring is different from that of the second plate spring, so as to perform a function of grading, buffering and limiting.

As an alternative embodiment, the second leaf spring piece is located close to the stopper seat 5 and the first leaf spring piece is located far from the stopper seat 5.

As an alternative embodiment, at least the outer surface of the collar 17 is made of damping material, so that the friction resistance when the collar is in collision contact with the double-rigidity plate spring 16 is increased, and the limiting effect is improved.

Example 2:

the utility model provides a compressor 15 comprising any one of the above vibration-damping impact-resistant limiting devices 100.

The vibration damping, impact resistant spacing device 100 is installed between a compressor to be vibration isolated and a mounting base structure (i.e., a mounting surface), as shown in fig. 1-5, and includes:

the base plate 1, base plate 1 pass through the bolt or weld and the mounting base (not shown in the figure) is fixed, has support 2 and spacing seat 5 on the base plate 1. The support 2 is connected with the bottom plate 1 through a bottom plate mounting bolt 4 and a bottom plate mounting nut 3, and an elastic gasket is arranged between the bottom plate mounting nut 3 and the bottom plate 1 to prevent the bolt from loosening. The limiting seat 5 and the bottom plate 1 can be connected through welding or screws from the lower part of the bottom plate.

The support 2 is formed by bending a sheet metal part with thicker thickness (such as 4mm), the vertical surface of the support 2 consists of two vertical plates, the two vertical plates of the support 2 are bent at 90 degrees, and the lower parts of the two vertical plates are respectively bent outwards and are parallel to the bottom plate 1; the upper part of one of the vertical plates is bent inwards by 90 degrees and is parallel to the bottom plate 1, and the upper part and the other vertical surface are welded at the intersection to form an upper flat plate of the bracket 2. The upper flat plate of the bracket 2 is provided with a round hole, and the lower side of the upper flat plate is glued with an upper limiting block 8. The upper surface of the upper limiting block 8 is provided with a convex annular structure excircle which is matched with the inner circle of the flat plate hole on the bracket 2. In order to increase the energy consumption in the event of an impact collision and to reduce the noise generated by the collision, the upper limiting block 8 is made of a material with a high damping capacity, such as nylon.

A metal spiral spring 9 is arranged on an upper flat plate of the bracket 2, and the spiral spring 9 penetrates through a machine leg stud 14. The lower part of the machine leg stud 14 is in a disc shape, and the edge of the machine leg stud is welded with the lower plane of the machine leg of the compressor 15. In order to prevent the coil spring 9 from large displacement play in the horizontal direction, a sleeve 10 is installed inside. The inner diameter of the sleeve 10 is slightly larger than the outer diameter of the machine foot stud 14, the outer diameter of the sleeve is slightly smaller than the inner diameter of the spiral spring 9, the influence on the deformation of the spring is small, and the sleeve 10 is made of self-lubricating materials such as PEEK materials.

The upper end of the spiral spring 9 is provided with a spring gland 11. The upper part of the spring gland 11 is provided with a first spring nut 12, an elastic gasket 13 is arranged on the spring nut 12, and a second spring nut is arranged on the elastic gasket 13. The elastic gasket 13 is in a compressed state, and can prevent the first spring nut and the second spring nut from loosening during vibration. When the gravity center and the geometric center of the compressor 15 do not coincide, the deformation of the spiral spring 9 corresponding to each machine leg can be adjusted by adjusting the screwing length of the spring nut 12 on the machine leg stud 14, so that the compressor 15 is ensured to have a good posture and to be in a vertical state, and the vibration coupling in each direction is reduced.

The top of the limiting seat 5 is stuck with a lower limiting block 7 which is made of the same material as the upper limiting block 8 and is made of nylon. The limiting seat 5 is drilled with a thread through hole which is parallel to the bottom plate 1. The double-rigidity plate spring 16 is fixed with the limiting seat 5 through a plate spring screw 6. The double-rate leaf spring 16 of (a) is made of spring steel sheets of different thicknesses and radii of curvature. The first plate spring piece is close to the compressor 15, and the second plate spring piece is close to the limiting seat 5. The first plate spring plate and the second plate spring plate are processed in a split mode and then are integrated in the middle through welding. The separate forming process is due to the need to design and process different thicknesses and radii of curvature. The middle position is welded to be integrated, so that bolt holes can be conveniently drilled, and the plate spring screws 6 which are convenient to mount subsequently are fixedly connected with the limiting seats. The first leaf spring has a smaller thickness and a smaller radius of curvature than the second leaf spring. The rigidity of the first plate spring piece is smaller than that of the second plate spring piece through different thickness designs, and the rigidity of the first plate spring piece and the rigidity of the second plate spring piece have the gradually hardening characteristic through the change of curvature radius. When the compressor generates horizontal vibration impact, the first plate reed of the double-rigidity plate spring 16 is firstly contacted with the lantern ring 17. The rigidity of the first plate spring is designed to be small, and buffering is carried out; the second leaf spring is designed to have higher rigidity, so that the first leaf spring is deformed to contact with the second leaf spring when the impact displacement of the compressor 15 is larger, and the displacement limit of the compressor is realized by the larger rigidity of the second leaf spring and the larger counter force generated by the second leaf spring. Is interference fitted to the lower part of the compressor 15. In order to reduce the noise and have larger friction damping when the collar 17 contacts the double-rigidity plate spring 16, the collar 17 is made of a composite material with a rough outer surface.

Various characteristic frequencies are generated during the operation of mechanical equipment, so that the rigidity of the vibration isolation element needs to be designed to be smaller in order to obtain higher vibration isolation efficiency. According to the utility model, through the model selection design of the parameters of the metal spiral spring, a lower natural frequency is obtained, and the vibration isolation effect can be achieved at a lower initial frequency. When the equipment installation environment (such as vehicle-mounted) generates vertical vibration or impact, the upper and lower limiting blocks perform inelastic collision with the machine leg of the compressor 15, and perform vertical (vertical) motion limiting. When the equipment installation environment (such as vehicle-mounted) generates vibration or impact in the horizontal direction, the horizontal direction is limited in the following two ways: 1. the machine foot stud 14 and the annular bulge of the upper limiting block 8 are collided and limited; 2. the dual-rigidity plate spring 16 collides with the collar 17 to perform horizontal one-way limiting. Wherein the plate spring plate rubs against the collar to provide additional damping and dissipate impact energy.

When the installation environment is static or quasi-static, the upper limit block 8, the lower limit block 7 and the plane of the machine leg of the compressor 15 are all at a small distance (1-2mm), and the double-rigidity plate spring 16 and the lantern ring 17 of the compressor are also at a small distance, so that the device can be ensured to slightly vibrate at the position where the spring is balanced, and the vibration isolation function is realized. When the installation environment vibrates or impacts are generated, the compressor foot and the upper and lower limiting blocks generate inelastic collision to vertically limit the compressor; the dual stiffness leaf spring 16 contacts the collar 17 to radially restrain the compressor. The key parts of the utility model are made of metal materials, and the utility model has the characteristics of stable performance, high reliability and strong environmental adaptability. The vibration reduction and impact resistance limiting device can be determined according to the number of the machine legs in one compressor, and usually three or four machine legs are uniformly distributed about the axis of the compressor.

The vibration-damping and impact-resisting device is provided with a vertical (vertical) and radial (horizontal) limiting structure. When vibration or impact occurs in an installation environment (such as a vehicle-mounted environment), the device limiting function is achieved, and a pipeline system attached to the device is prevented from being damaged due to overlarge relative displacement, so that the safety and the reliability of the operation of the device are improved. By using the metal spiral spring as the vibration isolation elastic element, the rigidity of the vibration isolation system can be accurately designed according to the vibration isolation requirement, the rigidity characteristic of the vibration isolation system is not changed along with the temperature and the service time, and the success rate of one-time design of the vibration isolation system is high. In addition, the metal helical spring type vibration isolation structure can adjust the posture of the equipment by adjusting the compression amount of the length adjusting spring by screwing the bolts corresponding to each machine leg of the equipment into the length adjusting spring, so that the vibration coupling in each direction is reduced.

In the description of the present invention, it is to be noted that "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing and simplifying the description, but do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus are not to be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood as appropriate to those of ordinary skill in the art.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention 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 invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A vibration damping and limiting device is characterized by comprising:

a support structure for securing the device to a mounting surface;

2. The vibration damping limiting device according to claim 1, wherein the supporting structure comprises a bracket and a limiting seat which are arranged in a split manner, the vibration isolating structure is arranged on the upper side of the bracket, and the bracket is detachably connected with the machine foot through a stud.

3. The vibration damping and limiting device according to claim 2, wherein the vibration damping structure further comprises an adjustment device provided on an upper side of the elastic member, the adjustment device being capable of adjusting a deformation amount of the elastic member.

4. The vibration damping and limiting device according to claim 3, wherein the elastic component is a spring, and the adjusting device comprises a spring gland and a spring nut; the spring is sleeved on the stud, and the bottom end of the spring abuts against the bracket; the spring gland is arranged at the top end of the spring and is matched with the stud to realize compression and fixation through the spring nut.

5. The vibration reduction and limiting device according to claim 4, wherein the vibration isolation structure further comprises a sleeve, the spring is a coil spring, and the sleeve is sleeved on the stud and is stuffed in a gap between the coil spring and the stud.

6. The vibration damping and limiting device according to claim 2, wherein the bracket comprises two vertical faces which are perpendicular to each other, and the upper part of each vertical face is bent inwards to form an upper flat plate which is parallel to the mounting surface.

7. The vibration damping and limiting device according to claim 6, wherein the bottom of each vertical surface is bent outwards to form a lower flat plate parallel to the mounting surface.

8. The vibration damping limiting device according to claim 2, wherein the vertical limiting structure comprises an upper limiting block and a lower limiting block, the upper limiting block is arranged on the support, the lower limiting block is arranged on the limiting seat, and the upper limiting block and the lower limiting block are respectively arranged at the upper side and the lower side of the machine leg.

9. The vibration damping limiting device according to claim 8, wherein the upper limiting block is a step-shaped cylinder with a through hole penetrating through the center; the support is provided with an upper fixing hole, the excircle of the raised step of the upper limiting block is matched with the inner circle of the upper fixing hole, and the upper limiting block is in limiting connection with the stud through the through hole.

10. The vibration damping and limiting device according to claim 8, wherein the upper limiting block and/or the lower limiting block are made of damping materials.

11. The vibration damping limiting device according to claim 2, wherein the horizontal limiting structure comprises a sleeve ring and a plate spring, the plate spring is installed on the limiting seat, the sleeve ring is used for being installed on the outer side of equipment, and the outer circle of the sleeve ring is matched with the inner circle of the plate spring.

12. The vibration damping and limiting device according to claim 11, wherein the plate spring is a double-rigidity plate spring and comprises a first plate spring piece and a second plate spring piece which are fixedly connected, and the rigidity of the first plate spring piece is different from that of the second plate spring piece.

13. The vibration damping and limiting device according to claim 12, wherein the radius of curvature of the first plate spring piece and the radius of curvature of the second plate spring piece are both in a gradual change manner.

14. The vibration dampening and limiting device according to claim 12, wherein the second leaf spring tab is located proximate to the limiting seat and the first leaf spring tab is located distal from the limiting seat.

15. The vibration damping and spacing device of claim 11 wherein at least the outer surface of the collar is made of a damping material.

16. A mechanical device comprising a vibration damping and spacing device as claimed in any of claims 1 to 15.

17. The mechanical apparatus of claim 16, wherein the mechanical apparatus is a compressor.