CN220629059U - A vibration reduction device for vertical water pump motors in thermal power plants - Google Patents

Abstract

The utility model belongs to the technical field of thermal power plant equipment, and discloses a vertical water pump motor vibration damper of a thermal power plant. The utility model provides a vertical water pump motor vibration damper of thermal power plant, including frame and guide shoe frame, still include: the first vibration reduction component and the second vibration reduction component are connected with each other and are arranged between the frame and the guide shoe frame; the first vibration reduction component comprises a connecting rod and a buffer spring sleeved on the connecting rod; the second vibration reduction component comprises a hydraulic cylinder main body and a piston plate arranged in the hydraulic cylinder main body; one end of the connecting rod is connected with one side of the guide shoe frame, which is close to the frame, and the other end of the connecting rod is connected with the piston plate; one end of the hydraulic cylinder main body far away from the connecting rod is connected with one side of the frame close to the guide shoe frame. According to the utility model, by arranging the two vibration reduction parts which are mutually cooperated, the device has better vibration reduction effect, more reliable performance and longer service life.

Description

A vibration reduction device for vertical water pump motors in thermal power plants

Technical field

The utility model belongs to the technical field of thermal power plant equipment, and specifically relates to a vibration reduction device for a vertical water pump motor in a thermal power plant.

Background technique

In the existing technology, vibration is an important factor affecting the safe operation of vertical water pump motors. Vertical water pump motors are affected by their own installation characteristics and are extremely prone to vibration during operation. When the vertical water pump motor is affected by factors such as mass imbalance and installation deviation, vibration is often reflected in the upper guide tiles of the motor. Vibration-absorbing treatment of the upper guide tile frame is an effective measure to alleviate its vibration on site.

The Chinese patent application number 202222751497.3 discloses a vertical pump motor guide frame for thermal power plants based on a vibration-damping structure, including an upper guide tile body. The circumferential exterior of the upper guide tile body passes through several evenly distributed connecting rods. The frame is connected to the upper frame, and the damping structure includes a rubber shell disposed between the upper frame and the upper guide shoe body. A bladder cavity filled with a predetermined pressure gas is provided inside the rubber shell. This solution does play a role in alleviating vibrations to a certain extent, but after long-term use, the high temperature generated by the rotation of the rotating shaft causes the rubber aging problem to become increasingly serious, causing the service life and actual vibration reduction effect of the device to increase with the use time. Speed decreases.

Therefore, there is an urgent need to provide a thermal power plant vertical water pump motor vibration reduction device with excellent vibration reduction effect and longer service life to overcome the above problems.

In view of this, the present utility model is proposed.

Utility model content

The technical problem to be solved by the utility model is to overcome the shortcomings of the existing technology, and the purpose is to provide a vibration reduction device for a vertical water pump motor in a thermal power plant with excellent vibration reduction effect and longer service life.

In order to solve the above technical problems, the basic concept of the technical solution adopted by this utility model is: a vibration damping device for a vertical water pump motor in a thermal power plant, which includes a frame and a tile guide frame, and also includes: a first vibration damping component and a second vibration damping device. components, the first damping component and the second damping component are connected to each other and arranged between the frame and the shoe guide frame.

Wherein, the first damping component includes a connecting rod and a buffer spring sleeved on the connecting rod; the second damping component includes a hydraulic cylinder body and a piston plate arranged in the hydraulic cylinder body; One end of the connecting rod is connected to the side of the shoe guide frame close to the frame, the other end of the connecting rod is connected to the piston plate; the end of the hydraulic cylinder body away from the connecting rod is connected to the machine The frame is connected close to the side of the shoe guide frame.

According to an embodiment of the present invention, the connecting rod includes a first section and a second section that are coaxially arranged and not connected.

One end of the first section is connected to the side of the shoe guide frame close to the frame, one end of the second section is connected to the piston plate; the other end of the first section is connected to the second The other end of the segment is set opposite.

According to an embodiment of the present invention, a buffer unit is provided at one end of the first section near the second section and/or at one end of the second section near the first section.

According to an embodiment of the present invention, one end of the buffer spring close to the first section is connected to a side of the shoe guide frame close to the frame, and the other end of the buffer spring is connected to the piston. The plate connection is connected close to the side of the connecting rod.

The buffer spring is a compression spring. In the initial state, the buffer spring is in a compressed state and provides thrust force to the frame and the shoe guide frame.

According to an embodiment of the present invention, the hydraulic cylinder body and the piston plate are surrounded by a receiving chamber, and the receiving chamber contains hydraulic oil;

The second shock-absorbing component also includes a communication pipe and an oil storage tank connected to the accommodation chamber through the communication pipe;

The oil storage tank is provided with an oil storage chamber whose volume changes according to the amount of oil contained therein.

According to an embodiment of the present invention, the first vibration damping component and the second vibration damping component are connected to form a set of vibration damping components, and the vibration damping device for a vertical water pump motor in a thermal power plant is provided with N groups of vibration damping components, N is an even number and N≥;

N groups of said damping components are arranged circumferentially along the side of the frame close to the tile guide frame;

The hydraulic cylinder bodies of the two sets of damping components arranged in the same diameter direction are connected through communication pipes.

According to an embodiment of the present invention, a throttling hole is provided on the side wall of the hydraulic cylinder body, one end of the communication tube is connected to a group of throttling holes of the vibration damping component, and the other end of the communication tube is connected to The throttling holes of the vibration damping components arranged in the same diameter direction of the group of damping components are connected to each other.

According to an embodiment of the present invention, an end of the hydraulic cylinder body away from the connecting rod is connected to a side of the frame close to the shoe guide frame through a first connecting component.

According to an embodiment of the present invention, the connecting rod is connected to a side of the shoe guide frame close to the frame through a second connecting component.

After adopting the above technical solution, the present utility model has the following beneficial effects compared with the existing technology.

(1) In this utility model, by arranging two mutually cooperating vibration damping components, the device has a better vibration damping effect, and at the same time overcomes the problem of accelerated aging of rubber at high temperatures. The performance of the device is more reliable and the service life is longer. long;

(2) In the present utility model, by arranging the buffer unit, the problem of noise caused by the collision between the first section and the second section is avoided, ensuring that the vibration damping device can realize the silent adjustment function, and at the same time, it also prevents the first section and the second section from causing noise. Friction damage occurs.

The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

Description of the drawings

The drawings, as part of the present utility model, are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model, but do not constitute an improper limitation of the present utility model. Obviously, the drawings in the following description are only some embodiments. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without exerting creative efforts. In the attached picture:

Figure 1 is a schematic structural top view of a vertical water pump motor vibration reduction device in a thermal power plant in an embodiment of the present invention;

Figure 2 is an enlarged schematic diagram of the top structure of some components of a vertical water pump motor vibration damping device in a thermal power plant according to an embodiment of the present invention.

Description of the main components in the figure:

1. Frame; 2. Shoe guide frame; 3. First damping component; 31. Connecting rod; 32. Buffer spring; 4. Second damping component; 40. Accommodating cavity; 41. Hydraulic cylinder body; 42. Piston plate; 43. Communication pipe; 44. Throttle hole; 5. First connecting component; 51. Flange; 52. Screws; 6. Second connecting component; 7. Blocking part.

It should be noted that these drawings and text descriptions are not intended to limit the scope of the present invention in any way, but are intended to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present utility model more clear, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the present utility model. The following examples are used for illustration. The utility model is not used to limit the scope of the utility model.

In the description of the present utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", and "outer" The indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. They are not intended to indicate or imply that the device or element referred to must have a specific orientation or a specific orientation. The orientation structure and operation of the invention cannot be construed as limitations of the present invention.

In the description of the present utility model, it should be noted that, unless otherwise clearly stated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection or a removable connection. Detachable connection, or integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

As shown in Figures 1 to 2, the utility model describes a vertical water pump motor vibration damping device in a thermal power plant (for convenience of expression, it will be referred to as a vibration damping device in the following), including a frame 1 and a tile guide frame 2 , also includes: a first damping component 3 and a second damping component 4. The first damping component 3 and the second damping component 4 are connected to each other and are arranged on the frame 1 and the guide shoe. between racks 2.

Among them, the first damping component 3 includes a connecting rod 31 and a buffer spring 32 sleeved on the connecting rod 31; the second damping component 4 includes a hydraulic cylinder body 41 and a hydraulic cylinder body 41. Piston plate 42 in 41;

One end of the connecting rod 31 is connected to the side of the shoe guide 2 close to the frame 1, and the other end of the connecting rod 31 is connected to the piston plate 42; the hydraulic cylinder body 41 is away from the connection. One end of the rod 31 is connected to the side of the frame 1 close to the shoe guide frame 2 .

Using the above solution, the device has better vibration damping effect through two cooperating vibration-damping components. At the same time, it overcomes the problem of accelerated aging of rubber at high temperatures. The performance of the device is more reliable and the service life is longer.

The guide bearings of vertical water pump motors in thermal power plants and similar large vertical motors are sliding bearings, referred to as guide shoes. The guide shoe is arranged around the motor rotor shaft and bears the radial mechanical unbalanced force and electromagnetic unbalanced force of the rotating part of the generator set. In this embodiment, the upper guide shoe is one of the components of the existing guide bearing/sliding bearing/guide shoe. It also includes a shoe guide frame 2. The upper guide shoe is installed between the frame 1 and the motor rotor shaft through the shoe guide frame 2. between. During operation, the energy generated by the vibration of the motor rotor can be effectively buffered and absorbed by the first vibration damping component 3 and the second vibration damping component 4, effectively reducing the vibration of the upper guide tile of the vertical water pump motor in the thermal power plant.

This embodiment provides a vibration damping device for a vertical water pump motor in a thermal power plant. When subjected to impact or vibration force, the spring (part of the first damping component 3) will deform, absorbing and converting part of the energy into elastic potential energy. . Subsequently, the spring will gradually release the stored energy, making the vibration process smoother. In this way, the spring reduces the peak impact force and mitigates the impact on the structure or system. By arranging the hydraulic mechanism (second damping component 4), the vibration impulse is effectively consumed and the stable output of the motor is ensured.

In a specific implementation of this embodiment, referring to Figure 1, the frame 1 and the shoe guide frame 2 are both an annular structure in the top view direction, and the vibration damping component (first damping component) The vibration component 3 and the second vibration reduction component 4) are arranged in the area between the two circular rings.

In a specific implementation of this embodiment, referring to FIG. 2 , the connecting rod 31 includes a first section and a second section that are coaxially arranged and not connected.

One end of the first section is connected to the side of the shoe guide frame 2 close to the frame 1, one end of the second section is connected to the piston plate 42; the other end of the first section is connected to the The other end of the second section is set opposite.

Using the above solution, by arranging the first section and the second section, the extreme compression position of the buffer spring 32 is limited to prevent the buffer spring from being damaged.

In a specific implementation of this embodiment, the distance between the first section and the second section is adjustable, which is achieved by selecting the first section and/or the second section of different lengths.

In a specific implementation of this embodiment, the buffer spring 32 is replaceable, and buffer springs 32 with different stiffnesses and different lengths can be replaced as needed.

In a specific implementation of this embodiment, the first section and/or the second section are made of elastic material, such as silicone. Of course, the first section and/or the second section can also be made of other materials. Parts made of elastic materials.

In a specific implementation of this embodiment, a buffer unit is provided at one end of the first section near the second section and/or at one end of the second section near the first section.

Using the above solution, by setting up the buffer unit, the problem of noise caused by the collision between the first section and the second section is avoided, ensuring that the vibration damping device achieves silent adjustment, and at the same time, it prevents friction damage between the first section and the second section. effect.

In a specific implementation of this embodiment, the buffer unit is a sound-absorbing sponge (polyurethane or polyester).

In a specific implementation of this embodiment, the buffer unit is a rubber sleeve with silica gel particles inside, and the rubber sleeve is replaceably mounted on the first section and/or the second section.

In a specific implementation of this embodiment, the buffer unit is a spring with smaller stiffness (relative to the buffer spring 32 ), and may be a spring with the same diameter as the end face of the first section/second section. The spring can also be a plurality of small springs (smaller than the diameter of the first section/second section) simultaneously arranged on the end surfaces of the first section/second section.

In a specific implementation of this embodiment, one end of the buffer spring 32 close to the first section is connected to a side of the shoe guide 2 close to the frame 1. The other end is connected to the side of the piston plate 42 close to the connecting rod 31 .

In a specific implementation of this embodiment, the buffer spring 32 is a compression spring; in the initial state, the buffer spring 32 is in a compressed state and provides a compression force to the frame 1 and the shoe guide frame 2 Thrust in directions away from each other.

In a specific implementation of this embodiment, the buffer spring 32 is a tension spring; in the initial state, the buffer spring 32 is in a stretched state and moves toward the frame 1 and the tile guide frame. 2 provides pulling force in the direction of approaching each other.

In a specific implementation of this embodiment, in the initial state, the buffer spring 32 is in a natural state.

It should be pointed out that the initial state refers to the state when the motor is not running, the vibration reduction device is not installed, or the motor does not vibrate during operation.

In a specific implementation of this embodiment, the hydraulic cylinder body 41 and the piston plate 42 are surrounded to form an accommodation cavity 40, and the accommodation cavity 40 contains hydraulic oil.

The second damping component 4 also includes a communication tube 43 and an oil storage tank (not shown in the figure) that communicates with the accommodation chamber 40 through the communication tube 43;

The oil storage tank is provided with an oil storage chamber whose volume changes according to the amount of oil contained therein.

In a specific implementation of this embodiment, multiple sets of second damping components 4 are provided. Multiple sets of second damping components 4 are respectively connected to their corresponding first damping components 3. Multiple sets of second damping components 4 are arranged along the inner side of the frame 1 (the frame 1 is close to the guide shoe). One side of the frame 2) is arranged circumferentially. Two second damping components 4 are arranged in the same diameter direction. The two second damping components 4 are arranged symmetrically about the axis of the frame 1 . The oil storage chambers of the two damping components 4 are connected with each other.

In a specific implementation of this embodiment, referring to Figure 1, the first vibration damping component 3 and the second vibration damping component 4 are connected to form a set of vibration damping components. The thermal power plant described The vertical water pump motor vibration damping device is equipped with N groups of vibration damping components, N is an even number and N≥4;

N groups of the vibration damping components are arranged circumferentially along the side of the frame 1 close to the shoe guide frame 2;

The hydraulic cylinder bodies 41 of the two sets of damping components arranged in the same diameter direction are connected through the communication pipe 43 .

Using the above solution, the accommodation cavities 40 arranged in the same diameter direction are connected with each other. When the vibration damping device on one side is squeezed to cause the second damping device 4 to operate, the accommodation cavity 40 on the other side is used to receive the squeeze. The hydraulic oil flows out without causing the other side to move (there is a distance between the first section and the second section), so there is no need to set up an additional oil storage tank, which reduces the volume of the vibration damping device.

In a specific implementation of this embodiment, the damping components (the first damping component 3 and the second damping component 4) are provided in four groups, and the four groups of the damping components are arranged on two In the diameter direction (the direct descending direction refers to the diameter direction of the frame 1/the shoe guide frame 2), that is, the two adjacent groups of vibration damping components are spaced 90 degrees apart.

In a specific implementation of this embodiment, the damping components (the first damping component 3 and the second damping component 4) are provided in eight groups, and the eight groups of the damping components are arranged on four diameters. direction, that is, the two adjacent groups of damping components are spaced 45 degrees apart.

In a specific implementation of this embodiment, referring to FIG. 2 , the second damping component 4 includes a blocking structure that limits the movement limit range of the piston plate. The blocking structure includes a blocking portion 7 that limits the upward limit distance of the piston plate 42 (in terms of the direction in Figure 2), and the component that limits the downward limit distance of the piston plate is the lower end wall of the hydraulic cylinder body 41 ( wall connected to the rack 1).

In a specific implementation of this embodiment, a throttling hole 44 is provided on the side wall of the hydraulic cylinder body 41, and one end of the communication pipe 43 is connected to the throttling hole 44 of a group of vibration damping components. The other end of the communication tube 43 is connected with the orifice 44 of the vibration damping component of the group of vibration damping components arranged in the same diameter direction.

Using the above solution, the flow rate of the hydraulic oil in the communication pipe 43 is controlled by arranging the orifice 44 , and at the same time, the second damping component 4 has greater rigidity.

In a specific implementation of this embodiment, the side wall of the hydraulic cylinder body 41 has a certain thickness, and the orifice 44 is a narrowed channel provided on the side wall of the hydraulic cylinder body 41 . It acts to limit the speed of fluid flow.

In a specific implementation of this embodiment, the end of the hydraulic cylinder body 41 away from the connecting rod 31 is connected to the side of the frame 1 close to the shoe guide frame 2 through the first connection assembly 5 .

In a specific implementation of this embodiment, referring to FIG. 2 , the first connection component 5 includes a flange 51 and screws 52 fastening the flange 51 .

In a specific implementation of this embodiment, referring to FIG. 1 , the first connection component 5 includes a fixed piece (not shown in the figure) provided at one end of the hydraulic cylinder body 41 close to the frame 1 ), the fixed piece and the corresponding position of the frame 1 are provided with threaded holes, and the fixed piece is fixed to the frame 1 through screws 52 .

In a specific implementation of this embodiment, the connecting rod 31 is connected to the side of the shoe guide frame 2 close to the frame 1 through the second connecting component 6

In a specific implementation of this embodiment, the second connection component 6 is a threaded connection or a snap connection, which is a conventional setting and will not be described again.

The application principle of the vibration damping device for a vertical water pump motor in a thermal power plant provided by this embodiment is as follows, see Figure 1 (the top, bottom, left and right are defined in Figure 1. It should be noted that Figure 1 is a top view, but for the convenience of description Expressed by the top, bottom, left and right sides of the view), specifically:

When the motor drives the shoe guide frame 2 to move toward the lower side, the buffer spring 32 of the first damping component 3 on the lower side is compressed, and the distance between the first section and the second section gradually shortens;

When the first section and the second section are in contact, the buffer spring 32 is compressed to the limit. If it cannot absorb all the vibration impulse, the second section of the first damping component 3 drives the piston of the second damping component 4. The plate 42 moves downward to offset the vibration impulse again, and the hydraulic oil in the lower second damping component 4 moves to the upper second damping component 4 through the communication tube 43;

After the vibration impulse is offset, because there is more hydraulic oil and greater pressure in the upper second damping component 4, the excess hydraulic oil in the upper second damping component 4 flows back to the lower second damping component. inside the receiving cavity 40 of the two damping components 4.

It should be pointed out that in the vibration damping device for a vertical water pump motor in a thermal power plant provided in this embodiment, the first damping component 3 is softer than the second damping component 4 (in comparison) When absorbing the same impulse, the first damping component 3 takes priority).

The vibration reduction device provided by this embodiment effectively alleviates the vibration problem of the vertical water pump motor caused by mass imbalance, installation deviation and other factors, and makes up for the difficulty in achieving the effect of on-site dynamic balancing and the period required for disassembly inspection. Not long enough.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form. Although the present utility model has been disclosed above in terms of preferred embodiments, they are not intended to limit the present invention. Any familiar Without departing from the scope of the technical solution of the present invention, those skilled in the patent can make some changes or modifications to equivalent embodiments with equivalent changes by using the technical content of the above tips. The implementations in the above embodiments can also be further combined. Or replace, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the technical content of the present utility model still fall within the scope of the present utility model.

Claims (9)

1. A vibration reduction device for a vertical water pump motor in a thermal power plant, including a frame (1) and a tile guide frame (2). It is characterized in that it also includes: A first damping component (3) and a second damping component (4). The first damping component (3) and the second damping component (4) are connected to each other and are arranged on the frame (1 ) and the shoe guide frame (2); Wherein, the first damping component (3) includes a connecting rod (31) and a buffer spring (32) sleeved on the connecting rod (31); the second damping component (4) includes a hydraulic cylinder The main body (41) and the piston plate (42) provided in the hydraulic cylinder main body (41); One end of the connecting rod (31) is connected to the side of the shoe guide frame (2) close to the frame (1), and the other end of the connecting rod (31) is connected to the piston plate (42); One end of the hydraulic cylinder body (41) away from the connecting rod (31) is connected to the side of the frame (1) close to the shoe guide frame (2). 2. A vibration damping device for a vertical water pump motor in a thermal power plant according to claim 1, characterized in that the connecting rod (31) includes a coaxially arranged first section and a second section that are not connected; One end of the first section is connected to the side of the shoe guide frame (2) close to the frame (1), and one end of the second section is connected to the piston plate (42); the first The other end of the segment is opposite to the other end of the second segment. 3. A vibration damping device for a vertical water pump motor in a thermal power plant according to claim 2, wherein the first section is close to one end of the second section and/or the second section is close to the second section. A buffer unit is provided at one end of a segment. 4. A vibration damping device for a vertical water pump motor in a thermal power plant according to claim 2, characterized in that one end of the buffer spring (32) close to the first section is close to the tile guide frame (2) One side of the frame (1) is connected, and the other end of the buffer spring (32) is connected to the side of the piston plate (42) close to the connecting rod (31); The buffer spring (32) is a compression spring; In the initial state, the buffer spring (32) is in a compressed state and provides thrust force to the frame (1) and the shoe guide frame (2). 5. A vibration damping device for a vertical water pump motor in a thermal power plant according to claim 1, characterized in that the hydraulic cylinder body (41) and the piston plate (42) are surrounded by an accommodation cavity (40), The accommodation cavity (40) contains hydraulic oil; The second damping component (4) also includes a communication pipe (43) and an oil storage tank connected to the accommodation chamber (40) through the communication pipe (43); The oil storage tank is provided with an oil storage chamber whose volume changes according to the amount of oil contained therein. 6. A vibration damping device for a vertical water pump motor in a thermal power plant according to claim 5, characterized in that the first damping component (3) and the second damping component (4) are connected to form a group Vibration damping components, the described vertical water pump motor vibration damping device in thermal power plants is provided with N groups of vibration damping components, N is an even number and N≥4; N groups of the vibration damping components are arranged circumferentially along the side of the frame (1) close to the shoe guide frame (2); The hydraulic cylinder bodies (41) of two sets of damping components arranged in the same diameter direction are connected through a communication pipe (43). 7. A vibration damping device for a vertical water pump motor in a thermal power plant according to claim 6, characterized in that a throttling hole (44) is provided on the side wall of the hydraulic cylinder body (41), and the communication pipe (43) One end is connected to the orifice (44) of a group of vibration damping components, and the other end of the communication tube (43) is connected to the orifice (44) of the vibration damping component arranged in the same diameter direction as the group of vibration damping components. Connected. 8. A thermal power plant vertical water pump motor vibration damping device according to any one of claims 1 to 7, characterized in that, one end of the hydraulic cylinder body (41) away from the connecting rod (31) passes through a third A connecting component (5) is connected to the side of the frame (1) close to the shoe guide frame (2). 9. A vibration damping device for a vertical water pump motor in a thermal power plant according to claim 8, characterized in that the connecting rod (31) is close to the tile guide frame (2) through the second connecting component (6) One side of the frame (1) is connected.