Vertical condensate pump damping device and damping method

Abstract

The embodiment of the application discloses a vertical condensate pump damping device and damping method, and belongs to the technical field of fluid machinery damping, the device comprises a damping module, a detection module and a control module, the damping module comprises a stiffness unit, a mass unit and a damping unit, the stiffness unit, the mass unit and the damping unit are mechanically connected along a first direction and fixed on a driving motor at the upper part of the vertical condensate pump through a mounting platform; the detection module is mechanically connected with the mass unit, and the detection module is used for detecting the vibration signal when the mass unit moves with the driving motor during the working process of the driving motor; the control module is connected with the detection module and the damping unit, and the control module is used for outputting a current signal corresponding to the vibration signal to the damping unit according to the vibration signal detected by the detection module, controlling the damping value generated by the damping unit, and changing the damping value provided by the damping unit to the mass unit. The application can improve the self-adaptive ability and damping effect of the damping device.

Description

Technical Field

[0001] This invention relates to the field of vibration reduction technology for fluid machinery, and more particularly to a vibration reduction device and method for a vertical condensate pump. Background Technology

[0002] The function of condensate pumps in power plants is to transport water from the condenser to the deaerator, forming a crucial component in the power plant's thermal cycle and ensuring the stable operation of the thermal system. Condensate pumps deliver condensate at near-saturation. To prevent cavitation near the pump inlet, most power plant condensate pumps are vertically arranged, with the motor located directly above the pump, resulting in a relatively long shaft. Furthermore, condensate pumps are characterized by high speed and large head, making them highly susceptible to excessive vibration during operation. In addition, to save energy, large power plants often use variable frequency drives (VFDs) for their condensate pumps, with the rotational frequency varying with the load. This causes the vibration frequency to also change with the load, posing significant challenges to vibration reduction. Vibration not only leads to fatigue damage to pump components, mechanical seal leakage, and shortened bearing life, but also generates significant noise, seriously affecting safe production and impacting the condensate pump's load regulation capabilities.

[0003] To address the aforementioned issues, commonly used vibration reduction methods include: rubber pad vibration isolation, spring vibration damping, and hydraulic damper vibration reduction. Rubber pad vibration isolation involves adding rubber pads to the lower part of the motor mounting bracket. Utilizing the high internal friction and reversible large deformation of the rubber material, mechanical vibration energy is converted into heat energy and dissipated, while simultaneously reducing the structural resonance peak. Spring vibration damping involves adding push rods, springs, or stiffening plates to the four sides of the motor to raise the motor's resonance frequency, thus avoiding the system's natural frequency and resonance zone. Connecting several adjacent pumps together with a steel frame to increase the rigidity of the support system can also be considered a type of spring vibration damping. Hydraulic dampers dissipate energy through the viscous resistance generated when liquid (usually oil) flows in narrow channels (such as piston holes or valve gaps). When the piston moves, it forces the liquid through the small hole, creating a pressure difference and generating damping force. Kinetic energy is converted into heat energy and dissipated through the internal friction between liquid molecules. These passive vibration reduction structures have limited vibration reduction effects, and the vibration reduction frequency is fixed and cannot be adaptively adjusted. Unlike other mechanical equipment, vertical condensate pumps operate at a high frequency, and this frequency varies with the external load. To achieve optimal vibration reduction, the vibration damper must not only meet the high-frequency vibration reduction requirements, but the design frequency of the vibration damping device must also be able to change within a certain range with the load, possessing intelligent self-adjustment capabilities.

[0004] However, rubber pad vibration isolation methods have non-adjustable damping, are prone to aging, and have a short lifespan. Hydraulic dampers have complex structures, high sealing requirements, and are difficult to maintain. These two types of vibration dampers mainly rely on damping force for vibration reduction and are suitable for low-frequency vibration reduction needs. Although spring vibration dampers can reduce vibrations in the high-frequency range, their vibration reduction effect is poor and their vibration reduction bandwidth is narrow. All of the above devices belong to passive vibration reduction. After installation, the stiffness and damping parameters of passive vibration damping devices remain fixed, and they can only achieve a good vibration reduction effect at a specified frequency point. It is difficult to achieve optimal vibration reduction across the entire operating range and meet the vibration reduction needs of vertical condensate pumps under different operating conditions. Magnetorheological dampers are mainly used to provide damping and are suitable for low-frequency vibration isolation and reduction, but they do not meet the vibration reduction needs of high-frequency vibrations such as those in vertical condensate pumps. Therefore, the vibration damping devices provided by existing technologies have poor adaptability and limited vibration reduction effect. Summary of the Invention

[0005] This invention provides a vertical condensate pump vibration damping device and vibration damping method, so that the vertical condensate pump vibration damping device can automatically adjust the damping parameters according to the real-time operating status of the condensate pump, thereby improving the adaptive capability and vibration damping effect of the vibration damping device.

[0006] According to one aspect of the present invention, a vibration damping device for a vertical condensate pump is provided, comprising: The vibration reduction module includes a stiffness unit, a mass unit, and a damping unit. The stiffness unit, the mass unit, and the damping unit are mechanically connected along a first direction and fixed to the drive motor on the upper part of the vertical condensate pump via a mounting platform. The stiffness unit supports the mass unit and drives the mass unit to vibrate with the drive motor. A detection module is mechanically connected to the mass unit, and the detection module is used to detect the vibration signal of the mass unit when it moves with the drive motor during the operation of the drive motor; A control module is connected to the detection module and the damping unit. The control module is used to output a current signal corresponding to the vibration signal detected by the detection module to the damping unit, control the damping value generated by the damping unit, and change the damping value provided by the damping unit to the mass unit.

[0007] Optionally, the vibration damping module further includes a housing; the stiffness unit, the mass unit, and the damping unit are integrated within the housing; The damping unit includes: A first isolation component and a second isolation component are arranged along a second direction. The first end of the first isolation component is connected to a first side of the housing, and the first end of the second isolation component is connected to a second side of the housing. The first isolation component and the second isolation component are used to divide the interior of the housing into a first cavity and a second cavity along the first direction. The stiffness unit and the mass unit are located in the first cavity. The first direction and the second direction are perpendicular. The system includes a connecting component, a first sealing component, and a second sealing component. One end of the connecting component extends into the first cavity, and the other end of the connecting component extends into the second cavity. The first sealing component is disposed at the second end of the first isolating component and is mechanically connected to the connecting component. The second sealing component is disposed at the second end of the second isolating component and is mechanically connected to the connecting component. A magnetically conductive component is disposed in the second cavity, and a magnetorheological fluid is also disposed in the second cavity.

[0008] Optionally, the magnetically conductive component is a hollow thin-walled cylinder; the material of the hollow thin-walled cylinder is a magnetically conductive material.

[0009] Optionally, the detection module includes a vibration sensor, which is used to detect the vibration signal when the mass unit moves with the drive motor.

[0010] Optionally, the control module includes: A data conversion unit is connected to the detection module. The data conversion unit is used to calculate the frequency signal corresponding to the vibration signal collected by the detection module and convert the frequency signal into an analog voltage signal. A control algorithm unit is connected to the data conversion unit. The control algorithm unit is used to calculate a target current value based on the received analog voltage signal and the preset optimal damping value at different frequencies. The target current value is the current value that minimizes the error between the damping value generated by the damping unit and the optimal damping value required at the vibration reduction frequency point of the vibration reduction module. A current driving unit is connected to the control algorithm unit, and the current driving unit is used to generate an excitation current according to the target current value output by the control algorithm unit; An excitation coil is disposed on the first and second sides of the second cavity. The excitation coil is connected to the current driving unit and is used to change the magnetic field of the magnetorheological fluid according to the excitation current.

[0011] Optionally, the data conversion unit includes a frequency-voltage converter, the input of which is connected to the detection module, and the output of which is connected to the control algorithm unit.

[0012] Optionally, both the mass unit and the housing are cylindrical in shape.

[0013] According to another aspect of the present invention, a method for vibration reduction of a vertical condensate pump is provided for controlling the vibration reduction device of the vertical condensate pump provided in any embodiment of the present invention; The vibration reduction method for the vertical condensate pump includes: The detection module detects the vibration signal of the mass unit as it moves with the drive motor during the operation of the drive motor. The control module outputs a current signal corresponding to the vibration signal detected by the detection module to the damping unit, controls the damping value generated by the damping unit, and changes the damping value provided by the damping unit to the mass unit.

[0014] Optionally, the control module includes a data conversion unit, a control algorithm unit, a current drive unit, and an excitation coil; the data conversion unit is connected to the detection module, the control algorithm unit is connected to the data conversion unit, the current drive unit is connected to the control algorithm unit, and the excitation coil is connected to the current drive unit. The control module outputs a current signal corresponding to the vibration signal detected by the detection module to the damping unit, controls the damping value generated by the damping unit, and changes the damping value provided by the damping unit to the mass unit, including: The data conversion unit calculates the frequency signal corresponding to the vibration signal collected by the detection module and converts the frequency signal into an analog voltage signal; The control algorithm unit calculates the target current value based on the received analog voltage signal and the preset optimal damping value at different frequencies; wherein, the target current value is the current value that minimizes the error between the damping value generated by the damping unit and the optimal damping value required at the vibration reduction frequency point of the vibration reduction module. The current drive unit generates an excitation current based on the target current value output by the control algorithm unit; The excitation coil changes the damping value generated by the damping unit based on the excitation current, thereby changing the damping value provided by the damping unit to the mass unit.

[0015] Optionally, the damping unit comprises a magnetorheological fluid; The excitation coil changes the damping value generated by the damping unit based on the excitation current, including: The excitation coil generates a magnetic field based on the excitation current and acts on the magnetorheological fluid, causing the shear yield strength of the magnetorheological fluid to change, thereby changing the damping value generated by the damping unit. The formula for calculating the damping value of the mass element is as follows: ; Where c is the damping value required for the vibration reduction module to achieve the best vibration reduction effect; m is the mass of the mass unit; Ω is the operating frequency of the drive motor, i.e. the design frequency point of the vibration reduction module; and μ is the mass ratio of the mass of the mass unit to the mass of the drive motor.

[0016] The technical solution of this invention provides a vertical condensate pump vibration damping device comprising a damping module, a detection module, and a control module. The damping module includes a stiffness unit, a mass unit, and a damping unit. The detection module is connected to the mass unit, and the control module is connected to both the detection module and the damping unit. This allows the control module to sense the pump's vibration state in real time based on the vibration signal transmitted by the detection module and output a current signal related to the current vibration state. This dynamically adjusts the damping force generated by the damping unit and transmits it to the mass unit, thereby dynamically adjusting the dynamic parameters of the damping module. This ensures the vertical condensate pump vibration damping device always operates in the optimal damping state, achieving vibration suppression over a wide frequency range. In other words, the vertical condensate pump vibration damping device provided by this invention can automatically adjust its damping parameters according to the real-time operating state of the condensate pump, improving the device's adaptability and damping effect.

[0017] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of a vertical condensate pump vibration damping device provided in an embodiment of the present invention; Figure 2 A schematic diagram of another vertical condensate pump vibration damping device provided in an embodiment of the present invention; Figure 3 A flowchart of a vibration reduction method for a vertical condensate pump provided in an embodiment of the present invention; Figure 4 A flowchart of another vibration reduction method for a vertical condensate pump provided in an embodiment of the present invention. Detailed Implementation

[0020] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0021] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and their variations, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0022] This invention provides a vibration damping device for a vertical condensate pump. Figure 1 This is a schematic diagram of a vertical condensate pump vibration damping device provided in an embodiment of the present invention. (See attached diagram.) Figure 1 The vertical condensate pump vibration damping device includes a vibration damping module 200, a detection module 18, and a control module 13.

[0023] The vibration damping module 200 includes a stiffness unit 5, a mass unit 6, and a damping unit 20. The stiffness unit 5, mass unit 6, and damping unit 20 are mechanically connected along the first direction Z and fixed to the drive motor 2 on the upper part of the vertical condensate pump via the mounting platform 4. The stiffness unit 5 supports the mass unit 6 and drives the mass unit 6 to vibrate with the drive motor 2. The detection module 18 is mechanically connected to the mass unit 6 and is used to detect the vibration signal of the mass unit 6 moving with the drive motor 2 during operation. The control module 13 is connected to the detection module 18 and the damping unit 20. The control module 13 is used to output a current signal corresponding to the vibration signal to the damping unit 20 based on the vibration signal detected by the detection module 18, control the damping value generated by the damping unit 20, and change the damping value provided by the damping unit 20 to the mass unit 6 to change the damping characteristics of the vibration damping module 200.

[0024] The drive motor 2 is the object to be vibration damped, and the stiffness unit 5 can be a support rod, specifically a spring unit. The support rod can act as a spring; by changing the diameter and length of the support rod, the stiffness of the vibration damping module 200 can be changed, thus adjusting the design frequency point of the vibration damping module 200. The mounting platform 4 is fixed to the upper cover of the drive motor 2 by support legs.

[0025] Specifically, during the operation of the drive motor 2, when the mass unit 6 vibrates in the second direction (X) and the third direction (Y) horizontal directions, the detection module 18 detects the vibration signal of the mass unit 6 in real time and transmits it to the control module 13. The control module 13 outputs a current signal corresponding to the vibration signal to the damping unit 20. The damping unit 20 responds to the received current signal by generating a damping force and transmitting it to the mass unit 6, forming a damping force opposite to the direction of the mass unit 6's motion speed, which is provided to the vibration reduction module 200. That is, the magnitude of the damping force generated by the damping unit 20 is related to the magnitude of the input current signal. When the control module 13 does not output a current signal, the damping unit 20 is de-energized, and the vibration reduction module 200 is equivalent to a dynamic vibration absorber, mainly targeting vibration reduction at a single frequency point. When the control module 13 outputs a current signal, the damping unit 20 is energized. The damping coefficient of the damping unit 20 in the vibration reduction module 200 changes rapidly. The control module 13 adjusts the output current signal based on the detected vibration frequency, thereby controlling the damping force of the vibration reduction module 200 in real time to adapt to different external excitation frequencies. The second direction X is perpendicular to both the third direction Y and the first direction Z. For example, the first direction Z can be vertical, the second direction X can be horizontal (east-west), and the third direction Y can be north-south.

[0026] The technical solution of this invention provides a vertical condensate pump vibration damping device comprising a vibration damping module 200, a detection module 18, and a control module 13. The vibration damping module 200 includes a stiffness unit 5, a mass unit 6, and a damping unit 20. The detection module 18 is connected to the mass unit 6, and the control module 13 is connected to both the detection module 18 and the damping unit 20. This allows the control module 13 to sense the pump's vibration state in real time based on the vibration signal transmitted by the detection module 18 and output a current signal related to the current vibration state. This dynamically adjusts the damping force generated by the damping unit 20 and transmits it to the mass unit 6, thereby dynamically adjusting the dynamic parameters of the vibration damping module 200. This ensures the vertical condensate pump vibration damping device always operates in the optimal vibration damping state, achieving vibration suppression over a wide frequency range for the vertical condensate pump. In other words, the vertical condensate pump vibration damping device provided by this invention can automatically adjust its damping parameters according to the real-time operating state of the condensate pump, improving the device's adaptability and vibration damping effect.

[0027] See also Figure 1 Based on the above embodiments, optionally, the vibration damping module 200 further includes a housing 12; the stiffness unit 5, the mass unit 6, and the damping unit 20 are integrated within the housing 12, that is, each unit module in the vibration damping module 200 is enclosed within the housing 12 of the vibration damping module 200. The housing 12 of the vibration damping module 200 is fixed to the mounting platform 4 by connecting screws. For example, the housing 12 is made of 45# steel. The lower part of the mass unit 6 is connected to the stiffness unit 5, that is, one end of the stiffness unit 5 is connected to the mass unit 6, and the other end is connected to the bottom housing 12 of the vibration damping module 200.

[0028] Optionally, the detection module 18 includes a vibration sensor for detecting the vibration signal of the mass unit 6 as it moves with the drive motor 2. For example, the vibration sensor may employ a magnetoelectric principle, requiring no external power supply, and can directly convert the motion speed of the mass unit 6 into an AC voltage signal output. The vibration sensor's range can be 0-50 mm / s, and its frequency range can be 5-1000 Hz.

[0029] Figure 2 A schematic diagram of another vertical condensate pump vibration damping device provided in an embodiment of the present invention is shown below. Figure 2 Optionally, based on the above embodiments, both the mass unit 6 and the housing 12 are cylindrical in shape.

[0030] The mass unit 6 can be composed of several layers of stacked iron plates, which can be made of 45# steel. The weight of the mass unit 6 depends on the weight of the drive motor 2. According to the dynamic vibration absorption theory, the weight of the mass unit 6 can be taken as 1.5% to 3% of the drive motor 2, i.e., m = μM; where μ is the mass ratio, which can be taken as 1.5% to 3%. M and m are the mass of the drive motor 2 and the mass unit 6 in the vibration damping module 200, respectively.

[0031] Furthermore, according to the theory of dynamic vibration absorption, we can conclude that: ;in, These are the natural frequencies of the mass element 6 within the vibration damping module 200. The operating frequency of the drive motor 2 is the design frequency of the vibration damping module 200.

[0032] According to the theory of dynamic vibration absorption, in order to achieve the best vibration reduction effect, the mass element 6 system of the vibration reduction module 200 is required to have appropriate damping, that is: In the formula, c is the damping value required for the damping module 200 to achieve the best damping effect. When the mass m of the mass unit 6 is determined, the mass ratio μ is determined, and the damping frequency point... As the damping coefficient changes, the required damping coefficient also changes synchronously. Therefore, the damping coefficient of the vibration reduction module 200 is required to have an adaptive synchronization function.

[0033] Therefore, by setting the vibration damping device to include a damping unit 20 and a control module 13, the vibration damping device can realize that the damping coefficient of the vibration damping module 200 can change synchronously with the vibration damping frequency.

[0034] The specific structures of the damping unit 20 and the control module 13 are described below by way of example, but are not intended to limit the present invention.

[0035] See also Figure 2 Optionally, the damping unit 20 includes: a first isolation component 23, a second isolation component 8, a connecting component 7, a first sealing component 24, a second sealing component 9, and a magnetically conductive component 10.

[0036] The first isolation component 23 and the second isolation component 8 are arranged along the second direction X. The first end of the first isolation component 23 is connected to the first side of the housing 12, and the first end of the second isolation component 8 is connected to the second side of the housing 12. The first isolation component 23 and the second isolation component 8 divide the interior of the housing 12 into a first cavity 25 and a second cavity 11 along the first direction Z. The stiffness unit 5 and the mass unit 6 are located in the first cavity 25. The first direction Z and the second direction X are perpendicular. One end of the connecting component 7 extends to the first cavity 25, and the other end of the connecting component 7 extends to the second cavity 11. The first sealing component 24 is disposed at the second end of the first isolation component 23 and is mechanically connected to the connecting component 7. The second sealing component 9 is disposed at the second end of the second isolation component 8 and is mechanically connected to the connecting component 7. The magnetically conductive component 10 is disposed in the second cavity 11, and the second cavity 11 is also provided with a magnetorheological fluid.

[0037] The first isolation component 23 and the second isolation component 8 can be flat plates. For example, the magnetorheological fluid (magnetorheological fluid) can be carbonyl iron powder-based, with a solid content of 40% and a zero magnetic field viscosity of 500 mPas. The first sealing component 24 and the second sealing component 9 can be rubber seals, and the connecting component 7 can be a connecting rod. The second cavity 11 is a closed cavity.

[0038] Under the influence of an external magnetic field, the rheological properties of magnetorheological fluids, such as viscosity and yield stress, can undergo reversible, continuous, and controllable changes within milliseconds. Without a magnetic field, it is a low-viscosity Newtonian fluid; upon applying a magnetic field, it instantly transforms into a solid-like substance with high yield stress, and returns to its original state after the magnetic field is removed. This reversible "liquid-solid" transformation is entirely controlled by the magnetic field, thus achieving dynamic adjustment of the damping force.

[0039] Optionally, the magnetically conductive component 10 is a hollow thin-walled cylinder; the material of the hollow thin-walled cylinder is a magnetically conductive material.

[0040] Specifically, the vibration damping module 200 internally forms a first cavity 25 and a second cavity 11 through a first isolation component 23 and a second isolation component 8, respectively. The second cavity 11 is located at the upper part of the mass unit 6 and contains a magnetorheological fluid. A connecting component 7 is designed at the upper part of the mass unit 6, and the connecting component 7 is connected to the upper hollow thin-walled cylinder through the first isolation component 23 and the second isolation component 8. To prevent magnetorheological fluid leakage, a first sealing component 24 and a second sealing component 9 are designed where the connecting component 7 passes through the first isolation component 23 and the second isolation component 8.

[0041] When the mass unit 6 vibrates in the two horizontal directions, the second direction X and the third direction Y, the connecting component 7 drives the hollow thin-walled cylinder to move. The magnetorheological fluid filling the space between the hollow thin-walled cylinder and the second cavity 11 of the vibration damping module 200 generates a damping force that acts on the surface of the hollow thin-walled cylinder and is transmitted to the mass unit 6 through the connecting component 7, forming a damping force opposite to the direction of the mass unit 6's movement speed, which is then provided to the vibration damping module 200.

[0042] To provide damping force that adapts and changes synchronously with frequency, the vibration reduction device is also designed with a control module 13. The specific structure of the control module 13 is described below.

[0043] See Figure 2 Optionally, the control module 13 includes: a data conversion unit 14, a control algorithm unit 15, a current drive unit 16, and an excitation coil 17.

[0044] The data conversion unit 14 is connected to the detection module 18. The data conversion unit 14 calculates the frequency signal corresponding to the vibration signal collected by the detection module 18 and converts the frequency signal into an analog voltage signal. The control algorithm unit 15 is connected to the data conversion unit 14. The control algorithm unit 15 calculates the target current value based on the received analog voltage signal and preset optimal damping values ​​at different frequencies. The target current value is the current value that minimizes the error between the damping value generated by the damping unit and the optimal damping value required by the vibration reduction frequency point of the vibration reduction module. The current drive unit 16 is connected to the control algorithm unit 15. The current drive unit 16 generates an excitation current based on the target current value output by the control algorithm unit. The excitation coil 17 is disposed on the first and second sides of the second cavity 11 and is connected to the current drive unit 16. The excitation coil 17 is used to change the magnetic field of the magnetorheological fluid according to the excitation current.

[0045] The data conversion unit 14 can serve as an intermediate unit, and the excitation coil 17 can be wound with enameled copper wire. The data conversion unit 14 may include a frequency-to-voltage converter. The control algorithm module 15 can use an STM32F407 microcontroller with a built-in PID vibration reduction control algorithm. It employs optimal control algorithms such as fuzzy control and neural networks, using the vibration frequency as input, optimal damping as the target, and the excitation coil current as the output. The algorithm has a built-in optimization objective: to minimize the error between the actual damping value and the optimal damping value required at the vibration reduction frequency point.

[0046] The inner surface of the second cavity 11 of the vibration damping module 200 is provided with a coil slot, and the excitation coil 17 can be wound in the coil slot. The current driving unit 16 outputs a corresponding excitation current to the excitation coil 17. The excitation coil 17 generates a magnetic field that acts on the magnetorheological fluid, causing the shear yield strength of the magnetorheological fluid to change, thereby adjusting the stiffness and damping characteristics of the vibration damping device and realizing adaptive suppression of the vibration of the vertical condensate pump.

[0047] Based on the specific structure of each module, the specific working process of this vibration damping device is as follows: A vibration sensor is installed on mass unit 6. The output signal of the vibration sensor is connected to a frequency-to-voltage converter. The frequency-to-voltage converter obtains the frequency of the AC signal by counting the number of input pulses of the AC voltage signal per unit time, and converts it into an analog voltage output, realizing the frequency-to-voltage conversion. The control algorithm module 15 calculates the required optimal current value based on the voltage value output by the frequency-to-voltage converter and the preset optimal damping value at different frequencies. The current drive module 16 generates and outputs current to the excitation coil 17 based on the target value calculated by the control algorithm module 15. After the current in the excitation coil 17 changes, the strength of the external magnetic field changes, thereby changing the damping value provided by the magnetorheological fluid to mass unit 6. The entire adjustment process is automatically completed by the intelligent control module without manual intervention. The device has a fast response speed (millisecond level) and high adjustment accuracy, improving the reliability and intelligence level of the equipment.

[0048] Optionally, the drive motor 12 is fixed to the ground by the support cylinder 1, and the mounting platform 4 is fixed to the upper cover of the drive motor 2 by four support legs 3.

[0049] In summary, this invention provides an intelligent vibration damping device for a vertical condensate pump based on a combination of magnetorheological fluid and dynamic vibration absorption. By setting the vibration damping device to include a mass unit, a stiffness unit (spring unit), a magnetorheological fluid, an excitation coil, a vibration sensor (detection module), a control module, and auxiliary modules such as a power supply module and a mounting frame, it can solve the problems of existing passive vibration damping technologies for vertical condensate pumps, which cannot adaptively adjust the dynamic parameters of the vibration damping module and have poor vibration damping effect. Furthermore, by proposing an intelligent vibration damping device based on intelligent magnetorheological fluid material with adjustable damping, combining magnetorheological fluid with dynamic vibration absorption, the vibration damping device can sense the vibration state of the pump body in real time and dynamically adjust the dynamic parameters of the vibration damping module according to the operating conditions of the condensate pump through an intelligent control algorithm, so that the system always works in the optimal vibration damping state and achieves vibration suppression over a wide frequency range for the vertical condensate pump. Furthermore, magnetorheological fluids exhibit the characteristic of instantaneously changing their rheological properties under the influence of an external magnetic field, and their shear yield strength can be continuously adjusted with the magnetic field strength. Based on this characteristic, vibration damping devices possess advantages such as fast response speed and strong adaptability. They are currently used in the automotive, transportation, and construction industries. Further application to vertical condensate pump vibration damping allows for intelligent adjustment of the damping module's characteristic parameters, significantly improving the vibration damping capacity of vertical condensate pumps. Moreover, this vibration damping device has a compact structure, is easy to install, requires no large-scale modification to existing vertical condensate pumps, and has a wide range of applications.

[0050] This invention provides a method for vibration reduction of a vertical condensate pump, used to control the vibration reduction device of the vertical condensate pump provided in any of the above embodiments.

[0051] Figure 3 A flowchart of a vibration reduction method for a vertical condensate pump provided in an embodiment of the present invention is shown below. Figure 3 Vibration reduction methods for vertical condensate pumps include: S100, the detection module detects the vibration signal of the mass unit as it moves with the drive motor during the operation of the drive motor.

[0052] S200: The control module outputs a current signal corresponding to the vibration signal to the damping unit based on the vibration signal detected by the detection module, controls the damping value generated by the damping unit, and changes the damping value provided by the damping unit to the mass unit.

[0053] The technical solution of this invention allows the control module to sense the vibration state of the pump body in real time based on the vibration signal transmitted by the detection module, and output a current signal related to the current vibration state. This dynamically adjusts the damping force generated by the damping unit and transmits it to the mass unit, thereby dynamically adjusting the dynamic parameters of the vibration reduction module. This ensures that the vertical condensate pump vibration reduction device always operates in the optimal vibration reduction state, achieving vibration suppression over a wide frequency range for the vertical condensate pump. In other words, the vertical condensate pump vibration reduction device provided by this invention can automatically adjust damping parameters according to the real-time operating state of the condensate pump, improving the adaptive capability and vibration reduction effect of the device.

[0054] Figure 4 A flowchart of another vertical condensate pump vibration reduction method provided in this embodiment of the invention is shown below. Figure 4 Optionally, the control module includes a data conversion unit, a control algorithm unit, a current drive unit, and an excitation coil; the data conversion unit is connected to the detection module, the control algorithm unit is connected to the data conversion unit, the current drive unit is connected to the control algorithm unit, and the excitation coil is connected to the current drive unit.

[0055] Vibration reduction methods for vertical condensate pumps include: S201, The detection module detects the vibration signal of the mass unit when it moves with the drive motor during the operation of the drive motor.

[0056] Specifically, the mass unit vibrates, and the magnetoelectric vibration sensor outputs a vibration AC signal.

[0057] S202, the data conversion unit calculates the frequency signal corresponding to the vibration signal collected by the detection module and converts the frequency signal into an analog voltage signal.

[0058] Specifically, the frequency-to-voltage converter receives the AC vibration signal, calculates the frequency value of the AC signal, and converts it into a voltage output.

[0059] S203, the control algorithm unit calculates the target current value based on the received analog voltage signal and the preset optimal damping value at different frequencies; wherein, the target current value is the current value that minimizes the error between the damping value generated by the damping unit and the optimal damping value required by the vibration reduction frequency point of the vibration reduction module.

[0060] Specifically, the control algorithm unit receives the voltage output from the frequency-to-voltage converter and obtains the optimal damping value and its corresponding current value.

[0061] S204 The current drive unit generates excitation current based on the target current value output by the control algorithm unit.

[0062] Specifically, the current drive module generates the optimal current for the current state based on the received current value.

[0063] S205. The excitation coil changes the damping value generated by the damping unit based on the excitation current, thereby changing the damping value provided by the damping unit to the mass unit.

[0064] Specifically, the excitation coil responds to the current change and changes the magnetic field of the magnetorheological fluid, causing the variable magnetorheological fluid to change its damping and generate the optimal damping force to be transmitted to the mass element.

[0065] This embodiment provides a vibration reduction method for a vertical condensate pump through steps S201-S205, which is also the intelligent control process of the vibration reduction device. In short, after the system is powered on, the detection module continuously monitors the vibration. The control algorithm unit in the control module uses the vibration frequency as input and, through an embedded algorithm, calculates the current value in real time, outputting it to the excitation coil to change the magnetic field and achieve adaptive intelligent vibration reduction. This enables the vertical condensate pump vibration reduction device to automatically adjust damping parameters according to the real-time operating status of the condensate pump, improving the device's adaptability and vibration reduction effect.

[0066] Based on the above embodiments, the damping unit may optionally include a magnetorheological fluid; The excitation coil changes the damping value generated by the damping unit based on the excitation current, including: The excitation coil generates a magnetic field based on the excitation current, which acts on the magnetorheological fluid, causing the shear yield strength of the magnetorheological fluid to change, thereby changing the damping value generated by the damping unit. The formula for calculating the damping value of a mass element is: ; Where c is the damping value required for the vibration reduction module to achieve the best vibration reduction effect; m is the mass of the mass unit; Ω is the operating frequency of the drive motor, i.e. the design frequency point of the vibration reduction module; and μ is the mass ratio of the mass of the mass unit to the mass of the drive motor.

[0067] In short, the intelligent vibration reduction method for vertical condensate pumps provided in this embodiment of the invention combines magnetorheological fluid intelligent materials with dynamic vibration absorption technology. It utilizes the changes in the physical properties of magnetorheological materials under the action of current to intelligently adjust the damping of the vibration reduction module, thereby improving the vibration reduction effect and effective frequency band range of the vibration reduction module.

[0068] The upper enclosed cavity (second cavity) of the vibration damping module is filled with magnetorheological fluid, which is carbonyl iron powder-based. The mass unit is connected to a hollow thin-walled cylinder made of magnetically conductive material at the top via a connecting rod passing through the plate. When the mass unit vibrates in the east-west and north-south directions, the connecting component drives the hollow thin-walled cylinder to move. The magnetorheological fluid filling the space between the hollow thin-walled cylinder and the enclosed cavity of the vibration damping module generates a damping force that acts on the surface of the hollow thin-walled cylinder and is transmitted to the mass unit through the connecting component, forming a damping force opposite to the direction of the mass unit's velocity, which is then provided to the vibration damping module.

[0069] The control module includes a frequency-to-voltage converter, a control algorithm module, a current drive module, and an excitation coil. This allows the damping coefficient of the vibration reduction module to change synchronously with the vibration reduction frequency.

[0070] In summary, this invention can adjust the vibration reduction parameters in real time and intelligently according to the operating conditions of the condensate pump, achieve efficient vibration reduction across the entire operating range, effectively realize wide-frequency vibration reduction, and improve the stability and reliability of pump unit operation.

[0071] The beneficial effects of the technical solution of this invention are as follows: (1) By combining magnetorheological fluid material with dynamic vibration absorption theory, the damping of the vibration reduction device can be intelligently adjusted by utilizing the intelligent magnetic control material characteristics of magnetorheological fluid, adapting to the vibration frequency changes of vertical condensate pump under different working conditions, solving the problem that traditional passive vibration reduction modules cannot adapt to changes in working conditions, and the vibration reduction effect is better than that of traditional passive vibration reduction devices. (2) The entire adjustment process is automatically completed by the intelligent control module without human intervention. The device has a fast response speed (millisecond level) and high adjustment accuracy, which improves the reliability and intelligence level of the equipment.

[0072] (3) The condensate pump vibration damping device is compactly packaged, easy to install, and does not require large-scale modification of existing vertical condensate pumps, making it widely applicable.

[0073] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0074] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A vibration damping device for a vertical condensate pump, characterized in that, include: The vibration reduction module includes a stiffness unit, a mass unit, and a damping unit. The stiffness unit, the mass unit, and the damping unit are mechanically connected along a first direction and fixed to the drive motor on the upper part of the vertical condensate pump via a mounting platform. The stiffness unit supports the mass unit and drives the mass unit to vibrate with the drive motor. A detection module is mechanically connected to the mass unit, and the detection module is used to detect the vibration signal of the mass unit when it moves with the drive motor during the operation of the drive motor; A control module is connected to the detection module and the damping unit. The control module is used to output a current signal corresponding to the vibration signal detected by the detection module to the damping unit, control the damping value generated by the damping unit, and change the damping value provided by the damping unit to the mass unit.

2. The vertical condensate pump vibration damping device according to claim 1, characterized in that, The vibration reduction module also includes a housing; the stiffness unit, the mass unit, and the damping unit are integrated within the housing; The damping unit includes: A first isolation component and a second isolation component are arranged along a second direction. The first end of the first isolation component is connected to a first side of the housing, and the first end of the second isolation component is connected to a second side of the housing. The first isolation component and the second isolation component are used to divide the interior of the housing into a first cavity and a second cavity along the first direction. The stiffness unit and the mass unit are located in the first cavity. The first direction and the second direction are perpendicular. The system includes a connecting component, a first sealing component, and a second sealing component. One end of the connecting component extends into the first cavity, and the other end of the connecting component extends into the second cavity. The first sealing component is disposed at the second end of the first isolating component and is mechanically connected to the connecting component. The second sealing component is disposed at the second end of the second isolating component and is mechanically connected to the connecting component. A magnetically conductive component is disposed in the second cavity, and a magnetorheological fluid is also disposed in the second cavity.

3. The vertical condensate pump vibration damping device according to claim 2, characterized in that, The magnetically conductive component is a hollow thin-walled cylinder; the material of the hollow thin-walled cylinder is a magnetically conductive material.

4. The vertical condensate pump vibration damping device according to claim 1, characterized in that, The detection module includes a vibration sensor, which is used to detect the vibration signal of the mass unit when it moves with the drive motor.

5. The vertical condensate pump vibration damping device according to claim 2, characterized in that, The control module includes: A data conversion unit is connected to the detection module. The data conversion unit is used to calculate the frequency signal corresponding to the vibration signal collected by the detection module and convert the frequency signal into an analog voltage signal. A control algorithm unit is connected to the data conversion unit. The control algorithm unit is used to calculate a target current value based on the received analog voltage signal and the preset optimal damping value at different frequencies. The target current value is the current value that minimizes the error between the damping value generated by the damping unit and the optimal damping value required at the vibration reduction frequency point of the vibration reduction module. A current driving unit is connected to the control algorithm unit, and the current driving unit is used to generate an excitation current according to the target current value output by the control algorithm unit; An excitation coil is disposed on the first and second sides of the second cavity. The excitation coil is connected to the current driving unit and is used to change the magnetic field of the magnetorheological fluid according to the excitation current.

6. The vertical condensate pump vibration damping device according to claim 5, characterized in that, The data conversion unit includes a frequency-voltage converter, the input of which is connected to the detection module, and the output of which is connected to the control algorithm unit.

7. The vertical condensate pump vibration damping device according to claim 2, characterized in that, Both the mass unit and the shell are cylindrical in shape.

8. A method for vibration reduction of a vertical condensate pump, characterized in that, Vibration damping device for controlling the vertical condensate pump according to any one of claims 1-7; The vibration reduction method for the vertical condensate pump includes: The detection module detects the vibration signal of the mass unit as it moves with the drive motor during the operation of the drive motor. The control module outputs a current signal corresponding to the vibration signal detected by the detection module to the damping unit, controls the damping value generated by the damping unit, and changes the damping value provided by the damping unit to the mass unit.

9. The vibration reduction method for a vertical condensate pump according to claim 8, characterized in that, The control module includes a data conversion unit, a control algorithm unit, a current drive unit, and an excitation coil; the data conversion unit is connected to the detection module, the control algorithm unit is connected to the data conversion unit, the current drive unit is connected to the control algorithm unit, and the excitation coil is connected to the current drive unit. The control module outputs a current signal corresponding to the vibration signal detected by the detection module to the damping unit, controls the damping value generated by the damping unit, and changes the damping value provided by the damping unit to the mass unit, including: The data conversion unit calculates the frequency signal corresponding to the vibration signal collected by the detection module and converts the frequency signal into an analog voltage signal; The control algorithm unit calculates the target current value based on the received analog voltage signal and the preset optimal damping value at different frequencies; wherein, the target current value is the current value that minimizes the error between the damping value generated by the damping unit and the optimal damping value required at the vibration reduction frequency point of the vibration reduction module. The current drive unit generates an excitation current based on the target current value output by the control algorithm unit; The excitation coil changes the damping value generated by the damping unit based on the excitation current, thereby changing the damping value provided by the damping unit to the mass unit.

10. The vibration reduction method for a vertical condensate pump according to claim 9, characterized in that, The damping unit comprises a magnetorheological fluid; The excitation coil changes the damping value generated by the damping unit based on the excitation current, including: The excitation coil generates a magnetic field based on the excitation current and acts on the magnetorheological fluid, causing the shear yield strength of the magnetorheological fluid to change, thereby changing the damping value generated by the damping unit. The formula for calculating the damping value of the mass element is as follows: ； Where c is the damping value required for the vibration reduction module to achieve the best vibration reduction effect; m is the mass of the mass unit; Ω is the operating frequency of the drive motor, i.e. the design frequency point of the vibration reduction module; and μ is the mass ratio of the mass of the mass unit to the mass of the drive motor.

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