Variable frequency condensate pump damping device

Abstract

The utility model relates to condensate pump technical field discloses a variable frequency condensate pump damping device, including cylindrical sealing box, four square distribution's baffle are fixedly connected with in the cylindrical sealing box, be provided with four cuboid sealing space between four baffle, each baffle with the semicircle arc sealing space of cylindrical sealing box inner wall is provided with, the inside of four cuboid sealing space is filled with a plurality of glass beads, the baffle outer wall with the cylindrical sealing box inner wall all are provided with T -shaped sliding slot, T -shaped sliding slot inner wall slidingly connected with T -shaped sliding block, fixedly connected with semicircle arc iron sheet between similar two T -shaped sliding blocks, fill a large number of glass beads in semicircle arc sealing space and four cuboid sealing space inside, when vibration energy transmission, glass beads pass through intergranular impact, friction and the contact with the space inner wall, quickly convert vibration energy into heat energy consumption, weaken vibration intensity from the source.

Description

Technical Field

[0001] This utility model relates to the field of condensate pump technology, and in particular to a vibration damping device for a variable frequency condensate pump. Background Technology

[0002] In industrial production, variable frequency condensate pumps, as key equipment, are widely used in thermal systems of industries such as power, chemical, and metallurgy, undertaking the important responsibility of transporting condensate and maintaining stable system water levels. With the rapid development of industrial technology and the continuous expansion of production scale, higher requirements are placed on the performance and stability of variable frequency condensate pumps. However, in actual operation, due to various factors, variable frequency condensate pumps inevitably experience structural vibration problems.

[0003] Currently, dynamic vibration absorption technology is used as a vibration reduction device for variable frequency condensate pumps. However, thermal power plants must conduct a full-plant A-level overhaul of all equipment according to the number of operating hours or the number of years of operation. Condensate pumps need to be disassembled for overhaul, which inevitably damages the overall structural characteristics of the condensate pumps. Furthermore, due to the control of the overhaul process and the characteristics of the replaced components, the natural frequency of the condensate pump often shifts after reassembly, resulting in a change in the structural vibration frequency of the condensate pump. This reduces the vibration reduction effect of the original dynamic vibration absorption device, and in severe cases, it may even have a counterproductive effect, generating greater vibration. At the same time, the condensate pump itself has the characteristic of asymmetrical axial support stiffness, with different stiffness in the inlet and vertical inlet directions. These stiffnesses coincide with different operating speeds, resulting in structural vibration. Therefore, the structural vibration of condensate pumps generally has two resonance peaks, and the vibration reduction device needs to simultaneously control vibration in both directions.

[0004] Particle dampers are excellent vibration reduction devices. Their working principle is that when mechanical rotating equipment vibrates, the vibration is transmitted to the particle damper, and the particles inside the damper collide and rub against each other, thereby converting the vibration into heat energy and dissipating it, thus achieving the purpose of vibration reduction. They have advantages such as not needing to change the external structure of the equipment and being easy to install. However, the vibration frequency of the variable frequency condensate pump structure may change, and the particle damper is difficult to adapt to the problem of structural vibration control after the frequency change. Therefore, a vibration reduction device for variable frequency condensate pumps is proposed. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a variable frequency condensate pump vibration reduction device, which aims to improve the problem that the existing particulate damper is difficult to adapt to the structural vibration control after frequency change.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: a vibration damping device for a variable frequency condensate pump, comprising a cylindrical sealing box, wherein four square-shaped partitions are fixedly connected inside the cylindrical sealing box, and a cubic sealing space is provided between the four partitions. A semi-circular arc sealing space is provided between each partition and the inner wall of the cylindrical sealing box. Each cubic sealing space is filled with a plurality of glass microspheres. T-shaped grooves are provided on the outer wall of the partitions and the inner wall of the cylindrical sealing box. A T-shaped slider is slidably connected, and a semi-circular iron plate is fixedly connected between two adjacent T-shaped sliders. A Y-shaped sealing ring is fixedly connected to the bottom of the semi-circular iron plate. The upper part of the semi-circular iron plate is a filling cavity, and the lower part of the semi-circular iron plate is an air cavity. The filling cavity is filled with multiple glass microspheres. The two opposite semi-circular sealing spaces are connected by a connecting pipe. A first pressure adjustment component is provided at the bottom of two semi-circular sealing spaces, and a second pressure adjustment component is provided at the bottom of the other two semi-circular sealing spaces.

[0007] Preferably, the first pressure regulating component includes a pressure relief valve, which is installed on the bottom wall of the semi-circular sealed space. A pressure sensor is fixedly connected to the input end of the pressure relief valve, and a pressure relief pipe that penetrates the outer wall of the cylindrical sealed box is fixedly connected to the output end of the pressure relief valve.

[0008] Preferably, the second pressure regulating component includes a pressure pump pipeline, which is installed at the bottom of the semi-circular sealed space and passes through the inner wall of the cylindrical sealed box, and a solenoid valve is fixedly connected to the outer wall of the pressure pump pipeline.

[0009] Preferably, the outer wall of the semi-circular iron plate abuts against the inner wall of the semi-circular sealing space, and the outer wall of the Y-shaped sealing ring abuts against the inner wall of the semi-circular sealing space.

[0010] Preferably, the glass microspheres have a particle size of 0.03 mm to 5 mm.

[0011] Preferably, both of the connecting pipes are disposed at the bottom of the cubic sealed space.

[0012] This utility model has the following beneficial effects: In this invention, by filling the semi-circular arc sealed space and the cubic sealed space with a large number of glass microspheres, when vibration energy is transmitted, the glass microspheres quickly convert the vibration energy into heat energy through particle collisions, friction, and contact with the inner wall of the space, thus weakening the vibration intensity at the source. Simultaneously, through the first pressure adjustment component and the second pressure regulating component, the air chamber pressure can be adjusted in real time according to the pump vibration frequency, changing the gap between the glass microspheres, thereby achieving vibration control of the variable frequency condensate pump structure at various frequencies. Attached Figure Description

[0013] Figure 1 This is a perspective view of a vibration damping device for a variable frequency condensate pump proposed in this utility model; Figure 2 This is a cross-sectional view of the cylindrical sealing box of a variable frequency condensate pump vibration damping device proposed in this utility model; Figure 3 for Figure 2 Enlarged view of point A in the middle; Figure 4 for Figure 2 Enlarged view of section B in the middle.

[0014] Legend: 1. Cylindrical sealing box; 2. Partition plate; 3. Semi-circular arc sealing space; 4. T-shaped slide groove; 5. T-shaped slider; 6. Semi-circular arc iron plate; 7. Y-type sealing ring; 8. Connecting pipe; 9. Glass microspheres; 10. Pressure pump pipeline; 11. Solenoid valve; 12. Pressure relief valve; 13. Pressure sensor; 14. Pressure relief pipeline; 15. Quadrilateral sealing space. Detailed Implementation

[0015] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and examples.

[0016] Reference Figures 1-4This utility model provides an embodiment of a variable frequency condensate pump vibration damping device, comprising a cylindrical sealed box 1. The cylindrical sealed box 1 serves as the basic load-bearing structure of the device, housing all internal vibration damping components. Simultaneously, its sealed design isolates the device from dust, moisture, and corrosive substances in the external environment. Four square-shaped partitions 2 are fixedly connected inside the cylindrical sealed box 1. A cubic sealed space 15 is provided between the four partitions 2, serving as the central buffer area of ​​the vibration damping system. When the vibration energy of the variable frequency condensate pump is transmitted to this area, it is absorbed by the materials filling it. A semi-circular arc sealed space 3 is provided between each partition 2 and the inner wall of the cylindrical sealed box 1. The four semi-circular arc sealed spaces 3... As an edge buffer zone of the vibration reduction system, it further absorbs the vibration energy of the variable frequency condensate pump. The cubic sealed space 15 is filled with multiple glass microspheres 9. As the core vibration reduction medium, the granular structure of the glass microspheres 9 allows them to move freely within the filling cavity and the cubic sealed space 15. When vibration energy is transmitted into the space, the glass microspheres 9 convert the vibration energy into heat energy through mutual collision, friction, and contact with the inner wall of the space, thereby achieving vibration attenuation. T-shaped grooves 4 are provided on the outer wall of the partition 2 and the inner wall of the cylindrical sealed box 1. T-shaped sliders 5 are slidably connected to the inner wall of the T-shaped grooves 4. A semi-circular iron plate 6 is fixedly connected between two adjacent T-shaped sliders 5. By sliding the T-shaped sliders 5 on the inner wall of the T-shaped grooves 4, vibration attenuation can be achieved. The semi-circular iron plate 6 slides up and down inside the semi-circular sealed space 3, dividing the semi-circular sealed space 3 into upper and lower parts. The upper part of the semi-circular iron plate 6 is a filling cavity, which is filled with glass microspheres 9 to achieve a shock absorption effect. The lower part of the semi-circular iron plate 6 is an air cavity. The air cavity changes the vertical position of the semi-circular iron plate 6 by adjusting the air pressure, thereby changing the gap of the glass microspheres 9 inside the filling cavity to adapt to different vibration environments. The filling cavity is filled with multiple glass microspheres 9. Under normal atmospheric pressure, due to the weight of the semi-circular iron plate 6, the semi-circular iron plate 6 is stuck at the 1:3 ratio division of the air cavity and the filling cavity. A Y-shaped sealing ring 7 is fixedly connected to the bottom of the semi-circular iron plate 6. The two semi-circular sealed spaces 3 are connected by a connecting pipe 8. Two opposing semi-circular arc-shaped sealing spaces 3 are connected by a connecting pipe 8, so that the two opposing semi-circular arc-shaped sealing spaces 3 are in the same vibration reduction direction. A first pressure adjustment component is provided at the bottom of each of the two semi-circular arc-shaped sealing spaces 3. When the pressure in the air cavity exceeds the safety threshold, the first pressure adjustment component can quickly start a pressure relief operation to prevent excessive pressure in the air cavity from damaging the sealing structure and internal components. A second pressure adjustment component is provided at the bottom of each of the two semi-circular arc-shaped sealing spaces 3. The second pressure adjustment component is used to compensate for the pressure loss in the air cavity. When the pressure in the air cavity decreases, the component can replenish the pressure in the air cavity to ensure that the pressure in the air cavity is always maintained within a suitable vibration reduction range, thus ensuring the stability of the vibration reduction effect.

[0017] Reference Figure 4 The first pressure regulating component includes a pressure relief valve 12, which is installed on the bottom wall of the semi-circular sealed space 3. The pressure relief valve 12 is the core control element of the first pressure regulating component. When the pressure in the air cavity reaches the preset pressure relief threshold, the pressure relief valve 12 will automatically open the valve channel. When the pressure drops to a safe range, the valve will automatically close, realizing automatic pressure control. A pressure sensor 13 is fixedly connected to the input end of the pressure relief valve 12. The pressure sensor 13 is used to detect the air pressure in the air cavity in the semi-circular sealed space 3 in real time and transmit the detected air pressure data to the pressure relief valve 12, providing accurate basis for the opening and closing of the pressure relief valve 12, and ensuring timely and accurate pressure relief operation. A pressure relief pipe 14 is fixedly connected to the output end of the pressure relief valve 12, which penetrates the outer wall of the cylindrical sealed box 1. The pressure relief pipe 14 is used to guide the air discharged by the pressure relief valve 12 to the outside of the cylindrical sealed box 1, so as to avoid the discharged air accumulating inside the air cavity and affecting the normal operation of other components.

[0018] Reference Figure 2 The second pressure regulating component includes a pressure pump pipe 10, which is installed at the bottom of the semi-circular sealed space 3 and penetrates the inner wall of the cylindrical sealed box 1. The pressure pump pipe 10 is a channel connecting the external pressure supply equipment and the air cavity, and can stably deliver the pressure medium generated by the external pressure pump to the air cavity to replenish the pressure in the space. A solenoid valve 11 is fixedly connected to the outer wall of the pressure pump pipe 10. The solenoid valve 11 is used to control the on / off state of the pressure pump pipe 10. When it is necessary to replenish the pressure in the air cavity, the solenoid valve 11 is opened to allow the medium to enter the air cavity through the pipe. When the pressure is replenished to the preset value, the solenoid valve 11 is closed to prevent the medium from continuing to flow in and to prevent the pressure in the air cavity from becoming too high.

[0019] Reference Figure 2 The outer wall of the semi-circular iron plate 6 and the inner wall of the semi-circular sealed space 3 abut against each other, as does the outer wall of the Y-shaped sealing ring 7. When vibration energy is transmitted to the filling cavity, the glass microspheres 9 inside the cavity generate downward radial pressure due to mutual compression. Under the action of pressure, the upper lip of the Y-shaped sealing ring 7 deforms towards the inner wall of the semi-circular sealed space 3, and the contact area expands from the initial linear contact to surface contact. The contact pressure increases synchronously with the increase of the filling cavity pressure. When the air cavity needs to increase the air pressure to enhance the vibration reduction effect, external gas enters the air cavity through the pressure pump pipe 10, and the air pressure inside the cavity increases and acts on the lower lip of the Y-shaped sealing ring 7. Under the action of air pressure thrust, the lower lip is squeezed towards the inner wall of the semi-circular sealed space 3, forming a positive correlation between "pressure and sealing force" similar to that of the upper lip.

[0020] Reference Figure 2The particle size of the glass microspheres 9 is 0.03mm to 5mm. The particle size of the glass microspheres 9 is usually between 0.03mm and 5mm. Using glass microspheres 9 with a particle size of 0.03mm to 5mm has suitable volume and mass, which can maintain good fluidity in the filling cavity, ensure that collision and friction can occur quickly under vibration, and efficiently absorb vibration energy, while avoiding the medium filling in the space not being tight due to excessive particle size.

[0021] Reference Figure 2 Both connecting pipes 8 are located at the bottom of the cubic sealed space 15, keeping the connecting pipes 8 away from areas with strong vibration, reducing the direct impact of vibration on the connecting pipes 8, and lowering the risk of the connecting pipes 8 being damaged due to vibration fatigue.

[0022] This utility model also provides a design example: Vibration damping device external dimension design: When the upper dimension of the variable frequency condensate pump motor is 1340mm×1340mm and the end cover diameter is 1000mm, and the end cover is directly bolted to the motor body, the cylindrical vibration damping device is designed with a bottom diameter D=1000mm and a height H=500mm. After directly replacing the end cover bolts, new bolts are used to fasten it to the condensate pump motor body.

[0023] Vibration damping device parameter adjustment design: The variable frequency condensate pump typically operates between 750-1500 r / min, corresponding to a working frequency between 12.5Hz and 25Hz. Therefore, the adjustable frequency range of the vibration damping device is 12.5Hz to 25Hz. Common glass microspheres have a particle size between 0.03mm and 5mm. To improve the wear resistance of the glass microspheres, engineering plastic grade glass microspheres are selected as the internal particle filler of the vibration damping device. The particle size of the glass microspheres is chosen to be 1mm, and the filling rate of each cavity is selected to be 95%. The pressure pump's adjustable pressure range is 0.1MPa-0.2MPa, corresponding to the adjustable frequency range of 12.5Hz to 25Hz of the vibration damping device. That is, every 0.01MPa pressure change corresponds to a 1.25Hz change in vibration frequency.

[0024] Vibration damping device parameter adjustment process: Initial parameters of the vibration damping device: 0.1MPa pressure in the air cavity of the semi-circular sealed space 3, corresponding to a vibration frequency of 12.5Hz.

[0025] Working principle: The vibration information of the variable frequency condensate pump is collected by a velocity sensor, a key phase sensor, and a vibration spectrum analyzer. When the vibration amplitude of the variable frequency condensate pump exceeds 0.1 mm, it is considered that there is structural vibration. At this time, the integrated feedback device starts to work, converts the vibration peak value and the corresponding frequency into the pressure value that the corresponding vibration reduction device needs to adjust, and then transmits the execution command to the pressure pump or pressure relief valve 12. The pressure pump or pressure relief valve 12 starts to work, and the pressure sensor 13 starts to change. The pressure sensor 13 indication signal is fed back to the integrated feedback device. When the required pressure value is reached, the integrated feedback device sends an execution command to the pressure pump or pressure relief valve 12, and the pressure pump or pressure relief valve 12 stops working.

[0026] When the peak vibration of the variable frequency condensate pump is 0.12 mm and the vibration frequency is 20 Hz, the pressure sensor 13 needs to be adjusted to 0.175 MPa. At this time, the pressure pump starts to work, the solenoid valve 11 opens, and the semi-circular iron plate 6 begins to move upward. When the pressure sensor 13 reaches 0.175 MPa, the vibration damping device frequency is adjusted to 20 Hz, the solenoid valve 11 immediately closes, and the pressure pump stops working. When the variable frequency condensate pump is disassembled and repaired, the structural stiffness decreases, causing the vibration frequency to decrease. The peak vibration is 0.2 mm and the frequency is 19 Hz. At this time, the pressure sensor 13 needs to be adjusted to 0.165 MPa. At this time, the pressure relief valve 12 of the semi-circular sealed space 3 opens, and the semi-circular iron plate 6 begins to move downward. When the pressure sensor 13 reaches 0.165 MPa, the vibration damping device frequency is adjusted to 19 Hz.

Claims

1. A vibration damping device for a variable frequency condensate pump, comprising a cylindrical sealing box (1), characterized in that: The cylindrical sealing box (1) has four square-shaped partitions (2) fixedly connected inside. A cubic sealing space (15) is provided between the four partitions (2). A semi-circular arc sealing space (3) is provided between each partition (2) and the inner wall of the cylindrical sealing box (1). The cubic sealing space (15) is filled with multiple glass microspheres (9). T-shaped grooves (4) are provided on the outer wall of the partitions (2) and the inner wall of the cylindrical sealing box (1). T-shaped sliders (5) are slidably connected to the inner wall of the T-shaped grooves (4). A semi-circular iron plate (6) is fixedly connected between the sliders (5). A Y-shaped sealing ring (7) is fixedly connected to the bottom of the semi-circular iron plate (6). The upper part of the semi-circular iron plate (6) is a filling cavity, and the lower part of the semi-circular iron plate (6) is an air cavity. The filling cavity is filled with multiple glass microspheres (9). The two semi-circular sealing spaces (3) are connected by a connecting pipe (8). The bottom of the two semi-circular sealing spaces (3) is provided with a first pressure adjustment component, and the bottom of the other two semi-circular sealing spaces (3) is provided with a second pressure adjustment component.

2. The vibration damping device for a variable frequency condensate pump according to claim 1, characterized in that: The first pressure adjustment assembly includes a pressure relief valve (12), which is installed on the bottom wall of the semi-circular sealed space (3). A pressure sensor (13) is fixedly connected to the input end of the pressure relief valve (12), and a pressure relief pipe (14) that penetrates the outer wall of the cylindrical sealed box (1) is fixedly connected to the output end of the pressure relief valve (12).

3. The vibration damping device for a variable frequency condensate pump according to claim 1, characterized in that: The second pressure regulating component includes a pressure pump pipe (10), which is installed at the bottom of the semi-circular arc sealing space (3) and passes through the outer wall of the cylindrical sealing box (1). A solenoid valve (11) is fixedly connected to the outer wall of the pressure pump pipe (10).

4. The vibration damping device for a variable frequency condensate pump according to claim 1, characterized in that: The outer wall of the semi-circular arc iron plate (6) and the inner wall of the semi-circular arc sealing space (3) abut against each other, and the outer wall of the Y-shaped sealing ring (7) and the inner wall of the semi-circular arc sealing space (3) abut against each other.

5. The vibration damping device for a variable frequency condensate pump according to claim 1, characterized in that: The glass microspheres (9) have a particle size of 0.03 mm to 5 mm.

6. The vibration damping device for a variable frequency condensate pump according to claim 1, characterized in that: Both of the connecting pipes (8) are located at the bottom of the cubic sealed space (15).

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