Motor tuned vibration damping device

Abstract

A motor tuned vibration damping device is provided. The present invention includes a fixed structure and a vibration damping structure, the fixed structure is fitted to the outer periphery of the motor, and the vibration damping structure is provided around the outer periphery of the motor. The vibration damping structure is provided on the top of the fixed structure and includes a vibration damping block 1 including a metal connection block 11 and a damping block 12, and an annular mass block including a first mass block 2 and a second mass block 3, and a plurality of vibration damping blocks are provided on the bottom of the annular mass block in the circumferential direction, the plurality of vibration damping blocks are spaced apart, and the vibration damping blocks are fixedly connected to the fixed structure and the annular mass block, respectively. The fixed structure is fitted to the outer periphery of the motor, so that the entire motor-tuned vibration damping device can be connected to the motor, and the fixed structure can bear the weight of the mass device and the damping device.

Description

[Technical field]

[0001] The present invention relates to the technical field of motor manufacturing, and more particularly to a motor tuned vibration damping device. [Background technology]

[0002] Vertical pumps have the advantages of space saving and convenient pipe arrangement, so in nuclear power plants, vertical structures are widely used for large condensate pumps, low pressure feed water pumps, circulation pumps, industrial water pumps, etc. However, vertical pumps have a long shaft system and low support rigidity, so the operating speed is easily close to the structural resonance of the equipment. At the same time, the motor is located on the top of the vertical pump, and this structural form determines the characteristics of low structural natural frequency and large vibration response. Once the operating frequency (such as the failure frequency that occurs when a failure occurs) and the structural natural frequency approach or overlap, the vibration of the pump group, especially the motor body, will be high, which will have a serious impact on the safe and stable operation of the pump group.

[0003] In view of the problem of high vibration caused by the vertical pump unit, the current solution is mainly to change the structural rigidity of the pump unit and use dynamic balancing to reduce the exciting force and damp the vibration. The disadvantages of this solution are as follows: First, changing the rigidity of the pump unit mainly requires measures such as replacing the bracket, increasing the support, and even replacing the motor model, which are difficult to implement, costly, and bound by the objective conditions of the site, and may not be possible to implement on site. Second, reducing the excitation force and lowering the damping through the dynamic balancing method cannot fundamentally solve the high vibration problem and is often only a temporary solution. When there is a slight change in the operating conditions of the pump unit, high vibration failure may occur again, which brings about a hidden danger to the stability and reliability of the pump unit.

[0004] Therefore, there is a need for a motor tuned vibration damping device to solve the above technical problems. Summary of the Invention [Means for solving the problem]

[0005] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a motor tuned vibration damping device capable of damping vibrations generated during rotation of a motor.

[0006] In order to achieve the above object, the present invention adopts the following technical means: 1. A motor tuned vibration damping device comprising: a fixing structure fitted to an outer periphery of the motor; a vibration damping structure provided around the outer periphery of the motor; The vibration damping structure is provided on the top of a fixed structure, the vibration damping structure includes a vibration damping block and an annular mass block, a plurality of the vibration damping blocks are provided circumferentially on the bottom of the annular mass block, the plurality of vibration damping blocks are spaced apart, and the vibration damping blocks are fixedly connected to the fixed structure and the annular mass block, respectively.

[0007] In one preferred embodiment of the motor-tuned vibration damping device, the annular mass block includes a first mass block and a second mass block, the first mass block and the second mass block are spaced apart from each other, the first mass block and the second mass block are both provided above the fixed structure, and the vibration damping block is provided at the bottom of both the first mass block and the second mass block.

[0008] In one preferred embodiment of the motor-tuned vibration damping device, the vibration damping blocks are provided in the circumferential direction at bottoms of the first mass block and the second mass block.

[0009] In one preferred embodiment of the motor-tuned vibration damping device, the vibration damping block located at the bottom of the first mass block and the vibration damping block located at the bottom of the second mass block are provided so as to intersect with each other.

[0010] In one preferred embodiment of the motor tuned vibration damping device, the vibration damping block includes a metal connection block and a damping block, and the metal connection block is provided on both the top and bottom surfaces of the damping block.

[0011] In one preferred embodiment of the motor tuned vibration damping device, the annular mass block and the vibration damping block are fixedly connected by a connecting bolt.

[0012] In one preferred embodiment of the motor tuned vibration damping device, the annular mass block is provided with a rod-shaped hole, and the longitudinal extension direction of the rod-shaped hole in a cross section is the same as the diametric direction of the annular mass block.

[0013] In one preferred embodiment of the motor tuned vibration damping device, the fixed structure includes a plurality of steel strips and a plurality of expansion claws, each of which is connected to two different steel strip ends, and the plurality of steel strips are connected to the plurality of expansion claws to form a ring structure.

[0014] In one preferred embodiment of the motor tuned vibration damping device, a magnet is provided on the wall side of the expansion locking claw facing the motor. Effect of the Invention

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: The fixed structure is fitted to the outer periphery of the motor, so that the entire motor tuned vibration damping device can be connected to the motor, and the fixed structure can bear the weight of the mass device and the damping device. The vibration damping structure is surrounded by the outer periphery of the motor, and the vibration damping structure includes a plurality of vibration damping blocks, so that when the motor generates vibration during rotation, the vibration is absorbed by the vibration damping blocks provided on the outer periphery of the motor, and the vibration of the motor does not seriously affect the stable operation of the pump unit. [Brief description of the drawings]

[0016] In order to more clearly describe the technical aspects in the embodiments of the present invention, the following briefly describes the drawings that need to be used in the description of the embodiments of the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention, and those skilled in the art can obtain other drawings based on the content of the embodiments of the present invention and these drawings without creative labor. [Figure 1] 1 is a schematic diagram of the overall structure of a motor tuned vibration damping device provided in an embodiment of the present invention; [Diagram 2] 1 is a front view of the entire motor tuned vibration damping device provided in an embodiment of the present invention; [Diagram 3] 1 is a plan view of the entire motor tuned vibration damping device provided in an embodiment of the present invention; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] The present invention will be described in more detail below with reference to the drawings and examples. It is understood that the specific embodiments described in this specification are used only to explain the present invention, not to limit the present invention. For convenience of explanation, the drawings show only the parts related to the present invention, and not the entire configuration.

[0018] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connection", "connection" and "fixed" should be understood in a broad sense. For example, they may be fixedly connected, detachably connected, or integral. They may be mechanically connected, electrically connected, directly connected, indirectly connected via an intermediate medium, or an internal connection between two elements or an interactive relationship between two elements. Those skilled in the art can specifically understand the specific meaning of the above terms in the present invention.

[0019] In the present invention, unless otherwise expressly specified and limited, a first feature may be "above" or "below" a second feature, including direct contact between the first and second features, or may be contact with another feature passing between the first and second features, without direct contact. Also, the terms "above", "on" and "above" a first feature of a second feature only indicate that the first feature is directly above and diagonally above the second feature, or that the level of the first feature is higher than that of the second feature. The terms "below", "below" and "below" a first feature of a second feature only indicate that the first feature is directly below and diagonally below the second feature, or that the horizontal height of the first feature is smaller than that of the second feature.

[0020] In the description of the present embodiment, the terms "upper", "lower", "right", and the like orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are merely for the purpose of facilitating the description and simplifying the operation, and are not to be understood as limitations on the present invention, and the terms "first" and "second" are used only for distinction in the description, and have no special meaning.

[0021] In the conventional technology, the motor is placed on the top of the vertical pump. This type of structure determines the characteristics of the structure's low natural frequency and large vibration response. Once the operating frequency (e.g., the failure frequency that occurs when a failure occurs) approaches or overlaps with the natural frequency of the structure, the vibration of the pump group, especially the motor body, increases, which seriously affects the safe and stable operation of the pump group.

[0022] To solve the above technical problems, a motor tuned vibration damping device is needed.

[0023] As shown in FIG. 1, the motor-tuned vibration damping device includes a fixed structure and a vibration damping structure, and in order to connect the entire motor-tuned vibration damping device to the motor, the fixed structure is fitted onto the outer periphery of the motor, and the vibration damping structure is arranged around the outer periphery of the motor, and the vibration damping structure is arranged on the top of the fixed structure, and the vibration damping structure includes a vibration damping block 1 and an annular mass block, and in order to absorb vibrations generated when the motor rotates, a plurality of vibration damping blocks 1 are arranged circumferentially on the bottom of the annular mass block, the plurality of vibration damping blocks 1 are arranged at intervals, and the vibration damping blocks 1 are fixedly connected to the fixed structure and the annular mass block respectively.

[0024] The fixed structure is fitted to the outer periphery of the motor, so that the entire motor-tuned vibration damping device can be connected to the motor, and the fixed structure can withstand the weight of the mass device and the damping device. The vibration damping structure is surrounded by the outer periphery of the motor, and the vibration damping structure includes a plurality of vibration damping blocks, so that when the motor generates vibration during rotation, the vibration is absorbed by the vibration damping blocks 1 provided on the outer periphery of the motor, preventing the motor vibration from seriously affecting the stable operation of the pump unit.

[0025] The annular mass block is composed of multiple annular mass plates, which are stacked together to form an annular mass block. The annular mass block can be adjusted by combining different annular mass plates to adjust the overall mass of the annular mass block, thereby changing the structural mass and overall stiffness. Generally, the mass of a single annular mass plate does not exceed 3 kg.

[0026] Optionally, in this embodiment, as shown in FIG. 2, the annular mass block includes a first mass block 2 and a second mass block 3, the first mass block 2 and the second mass block 3 are spaced apart from each other, the first mass block 2 and the second mass block 3 are both disposed above the fixed structure, the first mass block 2 is disposed between the second mass block 3 and the fixed structure, and the bottoms of the first mass block 2 and the second mass block 3 are both provided with vibration damping blocks 1. The number of vibration damping blocks 1 provided at the bottoms of the first mass block 2 and the second mass block 3 is set according to the fault frequency of the pump unit to be actually offset, and the bottoms of the first mass block 2 and the second mass block 3 are provided with vibration damping blocks 1, and different numbers of vibration damping blocks 1 can be applied to absorbing vibrations caused by different fault frequencies. When the number of vibration damping blocks 1 provided corresponding to the first mass block 2 and the second mass block 3 is different, it can realize vibration absorption caused by two kinds of fault frequencies of the pump unit.

[0027] A vibration damping block 1 is provided in the circumferential direction at the bottom of the first mass block 2 and the second mass block 3. The vibration damping block 1 can connect the fixed structure, the first mass block 2, and the second mass block 3, and when vibration occurs in the motor, the vibration damping block 1 located in the circumferential direction of the motor can absorb the vibration.

[0028] As an option, in this embodiment, the vibration damping block 1 located at the bottom of the first mass block 2 and the vibration damping block 1 located at the bottom of the second mass block 3 are arranged to intersect. In this embodiment, it can be understood that vibrations due to different failure frequencies can be absorbed by arranging the vibration damping block 1 so that the projection of the vibration damping block 1 at the bottom of the first mass block 2 onto the horizontal plane and the projection of the vibration damping block 1 at the bottom of the second mass block 3 onto the horizontal plane do not completely overlap or do not overlap.

[0029] Optionally, in this embodiment, please continue to refer to FIG. 2, the vibration damping block 1 includes a metal connection block 11 and a damping block 12, and the top and bottom of the damping block 12 are both provided with a metal connection block 11. The metal connection block 11 can be used to connect the damping block 12 to a mass block, and the damping block 12 is made of rubber, so that it can absorb vibration when the motor generates vibration.

[0030] Furthermore, the annular mass block and the vibration damping block 1 are fixedly connected by connecting bolts 4. By connecting the annular mass block and the vibration damping block 1 by the connecting bolts 4, processing can be simplified and the connection effect between the annular mass block and the vibration damping block 1 can be improved.

[0031] If the circle formed by the annular mass block is not a standard circle due to processing factors, the screw holes of the vibration damping block 1 and the screw holes of the annular mass block may not be aligned when connecting the annular mass block and the vibration damping block 1 using the connecting bolt 4. Therefore, as shown in Fig. 3, the annular mass block in this embodiment is provided with a rod-shaped hole 5, and the longitudinal extension direction of the cross section of the rod-shaped hole 5 is the same as the diameter direction of the annular mass block. In this way, the connecting bolt 4 can move within the rod-shaped hole 5 to determine the screw hole provided in the vibration damping block 1, and the connection between the vibration damping block 1 and the annular mass block can be realized.

[0032] In this embodiment, still referring to Fig. 2, the fixing structure includes a plurality of steel strips 7 and a plurality of expansion claws 6, and each expansion claw 6 is respectively connected to two different steel strip 7 ends, that is, the expansion claws 6 serve the purpose of connecting the steel strips 7. The plurality of steel strips 7 are connected with the plurality of expansion claws 6 to form a ring structure, so that the fixing structure can be fitted to the outer periphery of the motor.

[0033] An attachment hole 61 is provided in the expansion locking claw 6, and the ends of two different steel strips 7 are provided in the attachment hole 61. An ejection bolt 9 is inserted through the expansion locking claw 6 and abuts against the ends of the two different steel strips 7, and the ejection bolt 9 is provided perpendicular to the steel strip 7.

[0034] A magnet 8 is provided on the wall side of the expansion locking claw 6 facing the motor. The magnet 8 can be attached to the surface of the motor, and this allows a strong cover to be provided on the outer periphery of the motor for the fixing structure, preventing the fixing structure from coming off the motor due to long-term vibration of the motor.

[0035] For example, the fixing structure includes eight steel strips 7, eight expansion locking claws 6, and eight magnets 8, each expansion locking claw 6 is provided with a magnet 8 on the wall side facing the motor, the expansion locking claw 6 is provided with an accommodation hole for fitting the magnet 8, and the magnet 8 is connected to the accommodation hole by interference fit. Of course, the magnet 8 can also be connected by pasting it into the accommodation hole.

[0036] The number of the first mass block 2 and the second mass block 3 is one each, and eight vibration damping blocks 1 are installed at the bottom of the first mass block 2 and the second mass block 3, the vibration damping blocks located under the first mass block 2 are uniformly distributed in the circumferential direction, and the vibration damping blocks located under the second mass block 3 are uniformly distributed in the circumferential direction. The first mass block 2 and the second mass block 3 are both provided with a plurality of rod-shaped holes 5, the rod-shaped holes 5 on the first mass block 2 are uniformly distributed in the circumferential direction of the first mass block 2, and the rod-shaped holes 5 on the second mass block 3 are uniformly distributed in the circumferential direction of the second mass block 3. The top and bottom of the first mass block 2 are fixedly connected to the vibration damping block 1, respectively.

[0037] The specific installation number of vibration damping blocks in the motor synchronous vibration damping device is determined by the process as follows: Step 1: collecting vibration data of a motor, analyzing the signal, determining a fault signal of the motor, and determining a fault frequency; Step 2: integrating the fault frequency to determine a tuning frequency of the tuned vibration damping device; Step 3 of designing a tuned vibration damping device including a fixed structure and a constant mass vibration damping structure; Step 4: Design a fixing structure that meets the requirements of fixing and mounting based on the actual dimensions and characteristics of the motor; Step 5: the vibration damping structure is composed of a plurality of vibration damping blocks 1, each of which is composed of two upper and lower metal connection blocks 11 and a middle vibration damping block 12, the upper and lower metal connection blocks 11 are connected to the middle vibration damping block 12, the vibration damping block 12 is made of rubber, and the vibration damping block 12 and the two metal connection blocks 11 are fixed by vulcanization to form a whole; Step 6: Design an annular mass plate with a certain weight based on the failure frequency, and the annular mass block can be composed of multiple annular mass plates, and the total mass does not exceed 20 kg; Step 7: combining the vibration damping block 1 with the annular mass block, connecting the fixing structure, and assembling the motor tuned vibration damping device; and step 8 of carrying out performance testing and installation verification of the motor tuned vibration damping device.

[0038] It should be noted that the above are only preferred embodiments and the operating technical principles of the present invention. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that those skilled in the art can make various obvious changes, adjustments, and substitutions without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail by the above embodiments, the present invention is not limited to the above embodiments, and can include many other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims. [Explanation of symbols]

[0039] 1, vibration damping block; 11, metal connection block; 12, damping block; 2, first mass block; 3, second mass block; 4, connection bottle; 5, rod hole; 6, expansion locking claw; 61, mounting hole; 7, steel strip; 8, magnet; 9, ejection bottle.

Claims

1. a fixing structure fitted to an outer periphery of the motor; a vibration damping structure provided around the outer periphery of the motor; A motor-tuned vibration damping device characterized in that the vibration damping structure is provided on the top of a fixed structure, the vibration damping structure includes a vibration damping block (1) and an annular mass block, a plurality of the vibration damping blocks (1) are provided circumferentially on the bottom of the annular mass block, the plurality of vibration damping blocks (1) are provided at intervals, and the vibration damping blocks (1) are fixedly connected to the fixed structure and the annular mass block, respectively.

2. 2. The motor tuned vibration damping device of claim 1, wherein the annular mass block includes a first mass block (2) and a second mass block (3), the first mass block (2) and the second mass block (3) are spaced apart from each other, the first mass block (2) and the second mass block (3) are both arranged above the fixed structure, and the vibration damping block (1) is arranged at the bottom of both the first mass block (2) and the second mass block (3).

3. 3. The motor tuned vibration damping device according to claim 2, characterized in that the vibration damping blocks (1) are provided in the circumferential direction at the bottoms of the first mass block (2) and the second mass block (3).

4. 4. The motor tuned vibration damping device according to claim 3, characterized in that the vibration damping block (1) located at the bottom of the first mass block (2) and the vibration damping block (1) located at the bottom of the second mass block (3) are arranged so as to intersect.

5. The motor tuned vibration damping device according to claim 3, characterized in that the vibration damping block (1) includes a metal connection block (11) and a damping block (12), and the metal connection block (11) is provided on both the top and bottom surfaces of the damping block (12).

6. 2. A motor tuned vibration damping device according to claim 1, characterized in that the annular mass block and the vibration damping block (1) are fixedly connected by connecting bolts (4).

7. 7. The motor tuned vibration damping device according to claim 6, characterized in that the annular mass block is provided with a rod-shaped hole (5), the longitudinal extension direction of the rod-shaped hole (5) being the same as the diametric direction of the annular mass block.

8. 8. The motor tuned vibration damping device of claim 7, wherein the fixing structure includes a plurality of steel strips (7) and a plurality of expansion claws (6), each of the expansion claws (6) being connected to two different ends of the steel strips (7), and the plurality of steel strips (7) are connected to the plurality of expansion claws (6) to form an annular structure.

9. 8. A motor tuned vibration damping device according to claim 7, characterized in that a magnet (8) is provided on the wall side of the expansion locking pawl (6) facing the motor.

Images