CN217207470U - Dynamic vibration absorber with adjustable frequency and direction - Google Patents

Abstract

The utility model discloses a frequency and direction adjustable dynamic vibration absorber, include: the vibration absorption device comprises a base, a plurality of connecting seats and a vibration absorption unit, wherein the connecting seats are detachably fixed on the base; the vibration absorption unit comprises a fixed column vertically arranged on the connecting seat, an elastic rod horizontally penetrates through the fixed column, and discs are arranged at two ends of the elastic rod. The utility model discloses can be used to the too big improvement of rotating equipment bearing shell and stator casing vibration, adjust the design parameter of bump leveller, make its natural frequency unanimous with structure resonance frequency to install the purpose that can the damping in the great place of casing vibration, enough solve current design technical shortcoming, this bump leveller can be in a plurality of directions, and a plurality of frequencies carry out the damping, have good practical prospect.

Description

Dynamic vibration absorber with adjustable frequency and direction

Technical Field

The utility model relates to a bump leveller technical field especially relates to a frequency and direction adjustable dynamic bump leveller.

Background

Excessive structural vibration is a common problem in large rotating machines. In the power generation industry, steam turbine generator units, frequency conversion auxiliary machines and the like mostly have the problems. The root cause of such problems is the coincidence of the excitation frequency generated by the rotor and the natural frequency of the bearing-support system, thereby inducing structural resonances. There are two main methods for dealing with such vibration faults in the field: (1) the influence of the rotor exciting force on the system is weakened through a refined dynamic balance technology; (2) the natural frequency of the supporting system is improved by reinforcing the rigidity of the supporting system, so that the resonant frequency interval is avoided. However, these two methods have not solved the problem of the origin of the vibration, and the unbalanced force still appears after the machine has been operated for a certain period. The latter strengthens the support, reduces the vibration of the mechanical shell, but also increases the impact (such as collision and friction and oil film instability) of the rotor on the bearing bush. Eventually leading to accelerated damage of the bearing shells. The dynamic vibration absorber is a device which is designed according to the resonance principle and can absorb the vibration energy of a main vibration system. When the primary vibration system vibrates in a certain direction at a certain frequency, the dynamic vibration absorber can generate a force opposite to the motion direction to 'weaken' the vibration. So relapse on can transferring the dynamic vibration absorber with vibration volume on the main vibration system, reach the purpose of damping, present bump leveller is to single direction more, and single resonant frequency administers, and in the engineering, rotary machine is in a plurality of directions, and a plurality of frequencies all can produce structural resonance, and this makes present bump leveller practical application very restricted.

SUMMERY OF THE UTILITY MODEL

The invention aims to provide a dynamic vibration absorber with adjustable frequency and direction, which aims to overcome the defects in the prior art.

In order to achieve the above purpose, the utility model adopts the following technical scheme: a frequency and direction adjustable dynamic vibration absorber comprising: the vibration absorption device comprises a base, a plurality of connecting seats and a vibration absorption unit, wherein the connecting seats are detachably fixed on the base;

the vibration absorption unit comprises a fixed column vertically arranged on the connecting seat, an elastic rod horizontally penetrates through the fixed column, and discs are arranged at two ends of the elastic rod.

As a further description of the above technical solution:

the base is provided with a plurality of groups of connecting screw holes, wherein each group of connecting screw holes comprises four connecting screw holes which are arranged in a rectangular array.

As a further description of the above technical solution:

the connecting seat includes the base, four corner positions department of base all the shaping have with a set of connect the fixed screw of screw adaptation, screw thread through connection has fixed screw on the fixed screw.

As a further description of the above technical solution:

the top center position department of base is provided with the butt joint cover, the fixed column rotates to be connected in the butt joint cover, and is provided with locking mechanism in the fixed column, locking mechanism is used for carrying out the locking with fixed column and butt joint cover and fixes.

As a further description of the above technical solution:

the two ends of the elastic rod are both provided with thread sections, and the disc threads are sleeved on the thread sections of the elastic rod.

As a further description of the above technical solution:

locking mechanism is including seting up multiunit locking groove and the locking screw at the butt joint cover inner wall, locking screw thread through connection is on the fixed column, the bottom horizontal slip of fixed column is provided with the locking round pin that cooperation locking groove used, the bottom of locking screw rotates and is connected with the regulation connecting rod, and the bottom of adjusting the connecting rod with the tail end rotation of locking round pin is connected.

The utility model provides a frequency and direction adjustable dynamic vibration absorber. The method has the following beneficial effects:

this frequency and direction adjustable dynamic vibration absorber can be used to the too big improvement of rotating equipment bearing shell and stator shell vibration, adjusts the design parameter of bump leveller, makes its natural frequency unanimous with structure resonance frequency to install the purpose that can the damping in the great place of casing vibration, enough solve current design technical shortcoming, this bump leveller can be in a plurality of directions, and the damping is carried out to a plurality of frequencies, has good practical prospect.

Drawings

Fig. 1 is a schematic view of an overall structure of a frequency and direction adjustable dynamic vibration absorber according to the present invention;

FIG. 2 is a schematic view of an assembly structure of the vibration absorbing unit and the connecting seat of the present invention;

FIG. 3 is a schematic view of the vibration absorbing unit and the connecting seat of the present invention;

FIG. 4 is a schematic structural view of the base of the present invention;

fig. 5 is a schematic structural diagram of the locking mechanism of the present invention.

Illustration of the drawings:

1. a base; 11. a connecting screw hole; 2. a connecting seat; 21. a base; 22. fixing screw holes; 23. fixing screws; 24. butting sleeves; 3. a vibration absorbing unit; 31. fixing a column; 32. an elastic rod; 33. a threaded section; 34. a disc; 41. locking the screw rod; 42. a locking pin; 43. adjusting the connecting rod; 44. and a locking groove.

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.

Referring to fig. 1-5, a frequency and direction adjustable dynamic vibration absorber includes: the vibration absorption device comprises a base 1, wherein a plurality of connecting seats 2 are detachably fixed on the base 1, and vibration absorption units 3 are arranged on the connecting seats 2; the vibration absorbing unit 3 comprises a fixed column 31 vertically arranged on the connecting seat 2, an elastic rod 32 horizontally penetrates through the fixed column 31, and discs 34 are arranged at two ends of the elastic rod 32. The embodiment provides a frequency and direction adjustable dynamic vibration absorber, which is used for inhibiting vibration of a rotating machine, when in use, a base 1 is installed at a position of a shell with large vibration quantity of the rotating machine, optionally, the shell is installed and fixed by welding, a plurality of connecting seats 2 are arranged on the base 2, a plurality of connecting seats 2 are all spirally fixed on the base 1, and vibration absorbing units 3 are installed on the connecting seats 2, wherein a fixed column 31 in the vibration absorbing units 3 is vertically fixed at the top center position of the connecting seats 2, an elastic rod 32 is horizontally arranged on the fixed column 31 in a penetrating manner, namely, a T-shaped structure is formed between the elastic rod 32 and the fixed column 31, discs 34 are arranged at both ends of the elastic rod 32, specifically, threaded sections 33 are arranged at both ends of the elastic rod 32, the discs 34 are in threaded sleeve connection with the threaded sections 33 of the elastic rod 32, so that the dynamic vibration absorber is formed by combining a plurality of vibration absorbing units 3, can select the unit 3 cooperation connecting seat 2 of shaking of different quantity to install according to actual need to and each shake the unit 3 and can adjust the direction installation through connecting seat 2, can change the disc 34 of different quality as required simultaneously and install, and adjust the rigidity in order to realize controlling the bump leveller through the distance of threaded section 33 to disc 34 apart from elastic rod 32 tip, in order to reach the purpose of a plurality of directions of simultaneous control and frequency, it is adjustable to realize shaking the shock attenuation rate of appraising.

The base 1 is provided with a plurality of groups of connecting screw holes 11, wherein each group of connecting screw holes 11 comprises four connecting screw holes 11 arranged in a rectangular array. Connecting seat 2 includes base 21, and the equal shaping of four corner positions department of base 21 has the fixed screw 22 with a set of connection screw 11 adaptation, and screw thread through connection has fixed screw 23 on the fixed screw 22. Base 1 sets up four connection screw holes 11 that become the configuration of rectangular array and is a set of, and four connection screw holes 11 of every group are located a circle promptly to be provided with the fixed screw hole 22 that the screw hole 11 was used is connected in the cooperation through four turnings at connecting seat 2, when installing unit 3 that shakes through connecting seat 2, can rotate connecting seat 2 and coordinate fixed screw 23 after 45 and fix, both can realize that a plurality of directions carry out the damping and realize that the damping direction of shaking unit 3 is adjustable.

The top center position department of base 21 is provided with docking sleeve 24, and fixed column 31 rotates to be connected in docking sleeve 24, and is provided with locking mechanism in the fixed column 31, and locking mechanism is used for carrying out the locking with fixed column 31 and docking sleeve 24 fixedly. The locking mechanism comprises a plurality of groups of locking grooves 44 and locking screws 41 which are formed in the inner wall of the butting sleeve 24, the locking screws 41 are in threaded penetrating connection on the fixing column 31, locking pins 42 which are matched with the locking grooves 44 and used are horizontally arranged at the bottom end of the fixing column 31 in a sliding mode, the bottom end of each locking screw 41 is rotatably connected with an adjusting connecting rod 43, and the bottom end of each adjusting connecting rod 43 is rotatably connected with the tail end of each locking pin 42. Specifically, four groups of locking grooves 44 are symmetrically arranged, the included angle between any two adjacent groups is 45 degrees, when the vibration absorbing unit 3 needs to be adjusted in the vibration damping direction of the vibration absorbing unit 3 after being fixed by the coupling housing 2, it is possible to raise the locking screw 41 by rotating the locking screw 41 in the reverse direction, then the locking screw 41 cooperates with the adjusting link 43 to drive the locking pin 42 to contract, so that the locking pin 42 is separated from the locking groove 44, then the fixed column 31 is adjusted in rotation, after the adjustment is finished, the locking screw 41 is rotated in the forward direction to enable the locking screw 41 to move downwards, the locking pin 42 is then protruded to be inserted into the locking groove 44 by the locking screw 41 in cooperation with the adjusting link 43, thereby it is fixed to realize rotating the locking to fixed column 31 axial, realizes just can adjusting the damping direction of the unit 3 that shakes to dismantling connecting seat 2, and it is more convenient to use.

The working principle is as follows: the base 1 is arranged at the position of a shell with larger vibration quantity of the rotary machine, the fixing screw holes 22 which are matched with the connecting screw holes 11 are arranged at the four corners of the connecting seat 2 to be used for fixing in a matching way with the fixing screws 23, and when the vibration absorption unit 3 is arranged through the connecting seat 2, the connecting seat 2 can be arranged after being rotated and adjusted for 45 degrees, thereby realizing vibration absorption in multiple directions and realizing the adjustment of the vibration absorption direction of the vibration absorption unit 3, further, different numbers of vibration absorption units 3 can be selected to be matched with the connecting seat 2 for installation according to actual requirements, each vibration absorption unit 3 can be arranged by adjusting the direction through the connecting seat 2, meanwhile, discs 34 with different qualities can be replaced according to requirements for installation, and the distance between the disc 34 and the end part of the elastic rod 32 is adjusted through the thread section 33 to realize the control of the rigidity of the vibration absorber, in order to reach the purpose of a plurality of directions of simultaneous control and frequency, it is adjustable to realize the bump leveller shock attenuation evaluation rate, when need adjusting the damping direction of unit 3 that shakes after unit 3 that shakes through connecting seat 2 is fixed, rotate fixed column 31 and adjust, adjust the completion back, it makes locking screw 41 move down to rotate locking screw 41 again, then adjust connecting rod 43 through locking screw 41 cooperation and drive the protruding stretching of locking round pin 42 in order to insert locking groove 44, thereby it is fixed to realize rotating the locking of fixed column 31 axial, the realization is just can adjusting the damping direction of unit 3 that shakes to dismantle connecting seat 2, and it is more convenient to use.

Claims (6)

1. A dynamic vibration absorber with adjustable frequency and direction, comprising: the vibration absorption device comprises a base (1), wherein a plurality of connecting seats (2) are detachably fixed on the base (1), and vibration absorption units (3) are arranged on the connecting seats (2);

the vibration absorption unit (3) comprises a fixed column (31) vertically arranged on the connecting seat (2), an elastic rod (32) horizontally penetrates through the fixed column (31), and discs (34) are arranged at two ends of the elastic rod (32).

2. The dynamic vibration absorber with adjustable frequency and direction according to claim 1, wherein said base (1) is provided with a plurality of sets of connection screw holes (11), wherein each set of connection screw holes (11) comprises four connection screw holes (11) arranged in a rectangular array.

3. The dynamic vibration absorber with adjustable frequency and direction according to claim 2, wherein said connecting base (2) comprises a base (21), each of four corners of said base (21) is formed with a fixing screw hole (22) matching with a set of said connecting screw holes (11), and said fixing screw hole (22) is threaded through with a fixing screw (23).

4. The adjustable frequency and direction dynamic vibration absorber according to claim 3, wherein a docking sleeve (24) is disposed at a top center position of the base (21), the fixed column (31) is rotatably connected in the docking sleeve (24), and a locking mechanism is disposed in the fixed column (31) and is used for locking and fixing the fixed column (31) and the docking sleeve (24).

5. The dynamic vibration absorber with adjustable frequency and direction as claimed in claim 1, wherein both ends of the elastic rod (32) are provided with threaded sections (33), and the disc (34) is threaded onto the threaded sections (33) of the elastic rod (32).

6. The dynamic vibration absorber with adjustable frequency and direction as claimed in claim 4, wherein the locking mechanism comprises a plurality of sets of locking grooves (44) formed in the inner wall of the butting sleeve (24) and locking screws (41), the locking screws (41) are connected to the fixed column (31) in a threaded manner, a locking pin (42) used for matching with the locking grooves (44) is horizontally slidably arranged at the bottom end of the fixed column (31), an adjusting link (43) is rotatably connected to the bottom end of the locking screws (41), and the bottom end of the adjusting link (43) is rotatably connected to the tail end of the locking pin (42).

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