CN212177741U

CN212177741U - Damping device

Info

Publication number: CN212177741U
Application number: CN202020738497.8U
Authority: CN
Inventors: 伍继浩; 王金阵; 边星
Original assignee: Technical Institute of Physics and Chemistry of CAS
Current assignee: Technical Institute of Physics and Chemistry of CAS
Priority date: 2020-05-07
Filing date: 2020-05-07
Publication date: 2020-12-18
Anticipated expiration: 2030-05-07

Abstract

The utility model provides a damping device, including vacuum boundary, elastic component, tubular metal resonator, lead screw, permanent magnet and high magnetic conductivity alloy, when external interference impels the vacuum experiment device to take place the vibration, through the lead screw can drive the elastic component takes place to stretch out and draw back under the elastic component effect, the permanent magnet with relative motion takes place for the tubular metal resonator form the vortex in the tubular metal resonator, produces the lorentz power and hinders the vibration of permanent magnet makes the vacuum experiment device amplitude reduces gradually until being zero to avoided the damped rigidity of rubber big, damping coefficient is big, creep, influence vacuum scheduling problem, can be suitable for the requirement of the accurate physics experiment of high vacuum.

Description

Damping device

Technical Field

The utility model relates to a mechanical device's vibration and isolation technical field, in particular to damping device.

Background

In the precise vacuum physical measurement experiment, the vibration of the instrument and equipment can bring many problems to the experiment, especially in the case that the instrument and equipment needs to measure a specific frequency range, the vibration needs to be isolated to reduce the noise of the measurement. The main parameters of the damping structure include stiffness and damping coefficients, both of which affect the frequency of the vibrations, and the damping coefficient also determines the dissipation rate of the vibration energy. In high vacuum, gas damping is negligible.

The eddy current damper is a damping structure based on an electromagnetic principle, and the principle is that when a low-magnetism or non-magnetism material moves relative to a magnetic field, an eddy current field is formed in the material, so that the material is hindered from moving relative to the magnetic field by Lorentz force. The magnetic field may be generated by permanent magnets, energized wires, or the like. The eddy current damper has no pollution and no mechanical contact, and the dissipated heat can be quickly transferred out of the damping structure due to the high thermal conductivity of low-magnetism or non-magnetism materials such as copper, aluminum and the like. The eddy damping structure is passive and oilless, can be used for passive vibration isolation, and can meet the requirement of high vacuum.

The rubber is a common damping structure material, and has large damping coefficient and rigidity coefficient. However, the use of rubber also has its disadvantages. Firstly, the damping coefficient of rubber is too large, so that the over-damping condition is easily caused; secondly, the rubber has high rigidity, so that high vibration frequency is brought, and the requirement on the frequency of an instrument cannot be met; in addition, the rubber is subject to creep under long-term force, which is an unstable factor for the operation of precision mechanisms. Moreover, the rubber may have pores inside due to process problems, which may affect the vacuum degree of the high vacuum environment.

SUMMERY OF THE UTILITY MODEL

Therefore, it is necessary to provide a damping device which can avoid the problems of high rigidity, large damping coefficient, creep, influence on vacuum degree and the like of rubber damping in order to overcome the defects in the prior art.

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

the utility model provides a damping device, including vacuum boundary, elastic component, tubular metal resonator, lead screw, permanent magnet and high magnetic conductivity alloy, the one end of elastic component with the one end of lead screw is connected, the other end of lead screw is connected with outside vacuum experimental apparatus, permanent magnet and high magnetic conductivity alloy from top to bottom the interval cover establish on the lead screw, the permanent magnet reaches high magnetic conductivity alloy sets up in the tubular metal resonator is inside, the tubular metal resonator is nonmagnetic tubular metal resonator, the tubular metal resonator set up in the inside on vacuum boundary, the vacuum boundary with the vacuum experimental apparatus adopts the mode of high vacuum to connect;

when the vacuum experiment device vibrates, the elastic piece can be driven to stretch through the screw rod, under the action of the elastic piece, the permanent magnet and the metal pipe move relatively, eddy currents are formed in the metal pipe, Lorentz force is generated to block the vibration of the permanent magnet, and the amplitude of the vacuum experiment device is gradually reduced until the amplitude is zero.

In some preferred embodiments, the vacuum bellows is a solid of revolution, and the vacuum bellows includes a central rod disposed along a central line thereof, a bellows disposed around the central rod, and a housing enclosing the bellows, wherein the bellows can be elongated or shortened along a direction of the rotation axis, and the housing is connected to one end of the vacuum boundary by a high vacuum.

In some preferred embodiments, the corrugated pipe further comprises a knob, wherein an external thread is formed at one end of the central rod, which extends out of the corrugated pipe, and the external thread can be sleeved with an internal thread of a central through hole of the knob.

In some preferred embodiments, the knob is of a stepped truncated cone structure, the surface of the knob except for the central internal threaded hole is a smooth surface, and the height of the permanent magnet can be adjusted by rotating the knob.

In some preferred embodiments, the other end of the central rod is provided with a round hole, and the round hole is fixedly connected with one end of the elastic element.

In some preferred embodiments, both ends of the screw rod are provided with holes for connection, and the screw rod is respectively connected with the spring and the vacuum experiment device through the holes at both ends.

In some preferred embodiments, the surface of the screw rod is externally threaded, and two nuts are respectively disposed between two holes of the screw rod, through which the permanent magnet and the high-permeability alloy can be fixed on the screw rod.

In some preferred embodiments, the permanent magnet and the high-permeability alloy are both in a circular ring structure and at least one of the permanent magnet and the high-permeability alloy is arranged on the screw rod at intervals.

In some preferred embodiments, the elastic member is a spring, the metal tube is a tubular structure, the metal tube is copper or aluminum or copper aluminum alloy, and the inner diameter of the metal tube is adjustable.

In some preferred embodiments, the high permeability alloy is permalloy or silicon steel.

In some preferred embodiments, the high vacuum means connection comprises an adhesive seal or a mechanical seal.

The utility model adopts the above technical scheme's advantage is:

the utility model provides a damping device, when vibration takes place for external vacuum experiment device, through the lead screw can drive the elastic component takes place to stretch out and draw back under the elastic component effect, the permanent magnet with relative motion takes place for the tubular metal resonator form the vortex in the tubular metal resonator, produce the obstruction of lorentz force the vibration of permanent magnet makes vacuum experiment device amplitude reduces gradually until being zero to avoided rubber damped rigidity big, damping coefficient is big, creep, influence vacuum scheduling problem, can be suitable for the requirement of the accurate physics experiment of high vacuum.

Furthermore, the utility model provides a damping device can be at tubular metal resonator outer wall installation temperature regulating device, and the adjustment of damping coefficient is realized to the accurate control tubular metal resonator temperature.

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 structural diagram of a damping device according to an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a vacuum bellows according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Please refer to fig. 1, which is a schematic structural diagram of a damping device according to an embodiment of the present invention, including: a vacuum boundary 110, a spring 120, a metal tube 130, a lead screw 140, a permanent magnet 150, and a high permeability alloy 160.

Wherein: one end of the elastic member 120 is connected with one end of the screw rod 140, the other end of the screw rod 140 is connected with an external vacuum experiment device, the permanent magnets 150 and the high-permeability alloy 160 are sleeved on the screw rod 140 at intervals from top to bottom, the screw rod 140, the permanent magnets 150 and the high-permeability alloy 160 are arranged inside the metal tube 130, the metal tube 130 is a nonmagnetic metal tube, the metal tube 130 is arranged inside the vacuum boundary 110, the vacuum boundary 110 is connected with the vacuum experiment device in a high vacuum mode, and the high vacuum mode connection comprises glue sealing or mechanical sealing.

The utility model provides a damping device when the vacuum test device takes place to vibrate, through lead screw 140 can drive elastic component 120 takes place to stretch out and draw back under the effect of elastic component 120, permanent magnet 150 with the relative motion takes place for tubular metal resonator 130 form the vortex in the tubular metal resonator 130, produce the lorentz force and hinder permanent magnet 140's vibration, make the vacuum test device amplitude reduces gradually until being zero, and the energy accessible tubular metal resonator 130 that the vibration produced dissipates.

Referring to fig. 2, the damping device of the present invention further includes a vacuum bellows 170, wherein the vacuum bellows 170 includes a central rod 171 disposed along a central line thereof, a bellows 172 disposed around the central rod 171, and a housing 173 covering the bellows 172, and the housing 173 is connected to one end of the vacuum boundary 110 in a high vacuum manner.

It can be understood that when the vacuum experimental apparatus vibrates, the screw rod 140 can drive the elastic member 120 to expand and contract, and the bellows 172 can be extended or shortened along the rotation axis direction by the elastic member 120, and the damping apparatus can be applied to a vacuum environment.

Referring to fig. 1, the damping device may further include a knob 180, and an external thread (not shown) is formed at an end of the central rod 171 extending out of the corrugated tube 172, and the external thread may be engaged with an internal thread of a central through hole of the knob 180.

Further, the knob 180 has a stepped circular truncated cone structure, the other surfaces of the knob 180 except for the center of the internal threaded hole are smooth surfaces, and the height of the permanent magnet 150 can be adjusted by rotating the knob 180 to adjust the damping coefficient.

Specifically, the other end of the central rod 171 is opened with a circular hole, and the other end of the elastic member 120 can be fixedly connected with the circular hole. In the embodiment of the present invention, the elastic member 120 may be a spring or other elastic body.

It can be understood that the vibration frequency is only related to the rigidity and damping coefficient of the spring and the weight of the experimental device, and under the condition that the weight of the experimental device is determined, the required vibration frequency can be realized by selecting a proper spring and damping structure.

Referring to fig. 1 again, both ends of the wire 140 are provided with holes (not shown) for connection, and the screw 140 is respectively connected with the elastic member 120 and the vacuum experimental apparatus through the holes at both ends.

Furthermore, the surface of the screw rod 140 is provided with an external thread, two nuts 190 are respectively arranged between two holes of the screw rod 140, and the permanent magnet 150 and the high magnetic conductivity alloy 160 can be fixed on the screw rod 140 through the nuts 190.

Further, the permanent magnet 150 and the high-permeability alloy 160 are both in a circular ring structure and are at least one, and are arranged on the screw rod 140 at intervals.

It will be appreciated that by adjusting the number of permanent magnets 150 and high permeability alloy 160, and the magnetization direction of the permanent magnets, the damping can be increased to achieve different damping coefficients.

Referring to fig. 1 again, the metal tube 130 is a tubular structure, the metal tube 130 is made of a non-magnetic metal with high thermal conductivity, such as copper or aluminum or copper-aluminum alloy, the inner diameter of the metal tube 130 is adjustable, the damping coefficient can be adjusted by adjusting the inner diameter of the metal tube 130, and the alloy with high thermal conductivity is permalloy or silicon steel.

Furthermore, a temperature control device is installed on the outer wall of the metal tube, and the temperature control device can accurately control the temperature of the metal tube to realize the adjustment of the damping coefficient.

It can be understood that, when the damping device provided by the present invention is vertically arranged, when the elastic member 120 stretches, the elastic member 120, the lead screw 140, the permanent magnet 150, the high magnetic conductivity alloy 160 and the nut 190 do not have any contact with the metal tube 130, i.e. no mechanical contact can be realized; therefore, the utility model provides a damping device also can be applicable to the condition such as level, slope.

The utility model provides a damping device, when vibration takes place for external vacuum experiment device, through lead screw 140 can drive elastic component 120 takes place to stretch out and draw back under the effect of elastic component 120, permanent magnet 150 with tubular metal resonator 130 takes place relative motion form the vortex in the tubular metal resonator 130, produce the obstruction of lorentz force the vibration of permanent magnet 150 makes vacuum experiment device amplitude reduces gradually until being zero to avoided that rubber damping's rigidity is big, damping coefficient is big, creep, influence vacuum scheduling problem, this damping device can be used to the vacuum, and the frequency is adjustable, and the damping coefficient is adjustable, no mechanical contact, and the damping structure does not have oil, can be suitable for the requirement that high vacuum's accurate physics experiment can be suitable for the requirement of high vacuum's accurate physics experiment.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

Of course, the positive electrode material of the damping device of the present invention may have various changes and modifications, and is not limited to the specific structure of the above-described embodiments. In conclusion, the scope of the present invention should include those changes or substitutions and modifications which are obvious to those of ordinary skill in the art.

Claims

1. A damping device is characterized by comprising a vacuum boundary, an elastic part, a metal tube, a screw rod, a permanent magnet and a high-permeability alloy, wherein one end of the elastic part is connected with one end of the screw rod, the other end of the screw rod is connected with an external vacuum experiment device, the permanent magnet and the high-permeability alloy are sleeved on the screw rod from top to bottom at intervals, the screw rod, the permanent magnet and the high-permeability alloy are arranged in the metal tube, the metal tube is a non-magnetic metal tube, the metal tube is arranged in the vacuum boundary, and the vacuum boundary is connected with the vacuum experiment device in a high-vacuum mode;

2. The damper apparatus of claim 1, further comprising a vacuum bellows, the vacuum bellows comprising a center rod disposed along a center line thereof, a bellows disposed around the center rod, and a housing enclosing the bellows, the housing being connected to one end of the vacuum boundary by a high vacuum, the bellows being elongated or shortened in a direction of the rotation axis.

3. The damping device of claim 2, further comprising a knob, wherein an external thread is formed at one end of the central rod extending out of the corrugated pipe, and the external thread can be sleeved with an internal thread of the central through hole of the knob.

4. The damper device according to claim 3, wherein said knob is a stepped circular truncated cone structure, and the surface of said knob except for a central internal threaded hole is a smooth surface, and the height of said permanent magnet can be adjusted by rotating said knob.

5. The damping device as claimed in claim 4, wherein the other end of the central rod is provided with a circular hole, and is fixedly connected with the other end of the elastic member through the circular hole.

6. The damping device as claimed in claim 1, wherein the screw rod is provided with holes for connection at both ends thereof, and the screw rod is connected with the elastic member and the vacuum experiment device through the holes at both ends thereof, respectively.

7. The damping device of claim 6, wherein the surface of the screw is externally threaded, and two nuts are disposed between the two holes of the screw, respectively, through which the permanent magnet and the high permeability alloy are fixed to the screw.

8. The damping device of claim 7, wherein the permanent magnet and the high permeability alloy are both in a ring structure and at least one of the permanent magnet and the high permeability alloy is spaced apart from the lead screw.

9. The damper of claim 8, wherein the resilient member is a spring, the metal tube is a tubular structure, the metal tube is copper or aluminum or a copper aluminum alloy, the metal tube has an adjustable inner diameter, and the high permeability alloy is permalloy or silicon steel.

10. The damping device of claim 9, wherein a temperature control device is installed on the outer wall of the metal tube, and the temperature control device can precisely control the temperature of the metal tube to adjust the damping coefficient.