Reverse vibration reduction device and method for vertical condensate pump in power plant

Abstract

The present invention relates to the technical field of condensate pumps, and in particular to a reverse vibration reduction device and method for a vertical condensate pump in a power plant. The reverse vibration reduction device for the vertical condensate pump in a power plant comprises a main body shell, a main counterweight shell, a plurality of main mass blocks and two adjustable mass components; the adjustable mass components comprise a fixed component, a receiving component, a plurality of adjustable mass blocks and a plurality of springs, the fixed component is fixedly connected to the main counterweight shell, the receiving component is fixedly connected to the main body shell, and the plurality of adjustable mass blocks are detachably connected to the fixed component respectively; a plurality of springs are arranged between the main counterweight shell and the main body shell; after a mass ratio between a reverse vibration reduction device and the condensate pump is given, the spring stiffness is adjusted to meet the vibration reduction frequency point requirement; the damping of the reverse vibration reduction device is adjusted so that the exciting force of the reverse vibration reduction device acting on the condensate pump motor is opposite to the exciting force of the condensate pump itself, so as to achieve the goal of reducing the exciting force.

Description

Technical Field

[0001] The invention relates to the technical field of condensate pumps, and in particular to a reverse vibration reduction device and method for a vertical condensate pump in a power plant. Background Art

[0002] The condensate pump is an important auxiliary machine in a power plant. Its function is to transport the condensate in the condenser to the deaerator. In recent years, with the advancement of variable frequency speed regulation technology and the growing demand for energy conservation and consumption reduction, many power plants have begun to implement variable frequency transformation, that is, automatically adjusting the speed according to the flow rate to maintain a normal water level. This mode has good regulation performance and significant energy-saving effects. However, the condensate pump often vibrates during variable frequency operation, and the vibration is very large within a certain speed range. Since the condensate pump in the power plant adopts a vertical layout, the pump shaft and impeller are at the bottom, and the motor is at the top of the equipment, the maximum vibration is prominently manifested at the top of the motor. When the vibration problem occurs, it is difficult to deal with. At present, there is a lack of effective vibration reduction devices for the condensate pump, which affects the safe operation of the unit. Summary of the invention

[0003] The object of the present invention is to provide a reverse vibration reduction device and method for a vertical condensate pump in a power plant, which can reduce the vibration of the condensate pump.

[0004] To achieve the above-mentioned object, in a first aspect, the present invention provides a reverse vibration reduction device for a vertical condensate pump of a power plant, comprising a main body shell, a main counterweight shell, a plurality of main mass blocks and two regulating mass components;

[0005] The main counterweight shell is fixedly connected to the main body shell and is located inside the main body shell; the multiple main mass blocks are detachably connected to the main counterweight shell and are respectively located on the inner side of the main counterweight shell; the adjusting mass assembly includes a fixing member, a receiving member, a plurality of adjusting mass blocks and a plurality of springs; the fixing member is fixedly connected to the main counterweight shell and is located on the side of the main counterweight shell; the receiving member is fixedly connected to the main body shell and is located on the inner side of the main body shell; the plurality of adjusting mass blocks are detachably connected to the fixing member and are respectively located on the sides of the fixing member; the plurality of springs are respectively fixedly connected to the main counterweight shell and are respectively fixedly connected to the main body shell and are respectively located between the main counterweight shell and the main body shell, and the plurality of springs respectively penetrate the plurality of adjusting mass blocks; the two adjusting mass assemblies are mirror-imaged on both sides of the main counterweight shell.

[0006] Among them, the main counterweight shell includes a frame, a limit screw and a limit nut; the frame is fixedly connected to the main shell and is located on the inner side of the main shell; the limit screw is fixedly connected to the frame and is located on the inner side of the frame; the limit nut is threadedly connected to the limit screw and is located on the side of the limit screw.

[0007] Among them, the fixing component includes multiple fixing screws and multiple fixing nuts; the multiple fixing screws are respectively fixedly connected to the main shell, and respectively penetrate the multiple adjustment mass blocks, and are respectively located on the inner side of the main shell; the multiple fixing nuts are respectively threadedly connected to the multiple fixing screws, and are respectively located on the sides of the multiple fixing screws.

[0008] Among them, the receiving component includes multiple receiving screws and multiple receiving nuts; the multiple receiving screws are respectively fixedly connected to the frame and are respectively located on the sides of the frame; the multiple receiving nuts are respectively threadedly connected to the multiple receiving screws and are respectively located on the sides of the multiple receiving screws.

[0009] In a second aspect, the present invention further provides a method for reverse vibration reduction of a vertical condensate pump in a power plant, comprising:

[0010] Inject silicone oil into the gap between the spring and the main mass;

[0011] Testing the actual frequency of the reverse vibration reduction device of the vertical condensate pump of the power plant, and adjusting the number of the main mass block and the adjustment mass block until the actual frequency is the same as the preset frequency;

[0012] Testing the actual damping of the reverse vibration reduction device of the vertical condensate pump of the power plant, and adjusting the amount of silicone oil until the actual damping is the same as the preset damping;

[0013] The power plant vertical condensate pump reverse vibration reduction device is installed on the upper part of the condensate pump motor with the vibration reduction design direction as the installation direction.

[0014] The present invention provides a reverse vibration reduction device and method for a vertical condensate pump in a power plant. After a mass ratio between the reverse vibration reduction device and the condensate pump is given, the spring stiffness is adjusted to meet the vibration reduction frequency point requirement; the damping of the reverse vibration reduction device is adjusted so that the exciting force of the reverse vibration reduction device on the condensate pump motor is opposite to the exciting force of the condensate pump itself, thereby achieving the goal of reducing the exciting force. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a dynamic analysis model diagram of a reverse vibration reduction device for a vertical condensate pump in a power plant according to the present invention.

[0017] Figure 2It is a structural schematic diagram of a reverse vibration reduction device for a vertical condensate pump in a power plant according to the present invention.

[0018] Figure 3 The invention is a schematic structural diagram of a reverse vibration reduction device for a vertical condensate pump in a power plant, which does not include a sealing cover.

[0019] Figure 4 It is a front cross-sectional view of a reverse vibration reduction device for a vertical condensate pump in a power plant according to the present invention.

[0020] Figure 5 It is a top view cross-sectional view of a reverse vibration reduction device for a vertical condensate pump in a power plant according to the present invention.

[0021] Figure 6 It is a vibration response diagram of the main mass block of the present invention when being impacted.

[0022] Figure 7 The present invention is a flow chart of a reverse vibration reduction method for a vertical condensate pump in a power plant.

[0023] 1-main shell, 2-main counterweight shell, 3-main mass block, 4-adjusting mass component, 11-shell, 12-reinforcement plate, 13-sealing cover, 21-frame, 22-limiting screw, 23-limiting nut, 41-fixing member, 42-receiving member, 43-adjusting mass block, 44-spring, 411-fixing screw, 412-fixing nut, 421-receiving screw, 422-receiving nut. DETAILED DESCRIPTION

[0024] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0025] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, in the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0026] See also Figure 1 to Figure 7In a first aspect, the present invention provides a reverse vibration reduction device for a vertical condensate pump of a power plant, comprising a main housing 1, a main counterweight shell 2, a plurality of main mass blocks 3 and two regulating mass components 4;

[0027] The main counterweight shell 2 is fixedly connected to the main body shell 1 and is located inside the main body shell 1; multiple main mass blocks 3 are detachably connected to the main counterweight shell 2 and are respectively located on the inner side of the main counterweight shell 2; the adjustable mass assembly 4 includes a fixing member 41, a receiving member 42, multiple adjustable mass blocks 43 and multiple springs 44; the fixing member 41 is fixedly connected to the main counterweight shell 2 and is located on the side of the main counterweight shell 2; the receiving member 42 is fixedly connected to the main body shell 1 and is located on the inner side of the main body shell 1; multiple adjustable mass blocks 43 are detachably connected to the fixing member 41 and are respectively located on the sides of the fixing member 41; multiple springs 44 are respectively fixedly connected to the main counterweight shell 2 and are respectively fixedly connected to the main body shell 1 and are respectively located between the main counterweight shell 2 and the main body shell 1, and multiple springs 44 respectively penetrate multiple adjustable mass blocks 43; two adjustable mass assemblies 4 are mirror-imaged on both sides of the main counterweight shell 2.

[0028] In this embodiment, the reverse vibration reduction principle of the present invention is:

[0029] like Figure 1 As shown, the condensate pump is regarded as a pump consisting of mass m 1 、Spring 44k 1 and damping c 1 The system consists of a system with a displacement of x 1 , on which there is an exciting force f 1 (t) = F 1 e jωt , the amplitude is F 1 , the frequency is ω. A reverse vibration reduction device is designed above the condensate pump. The reverse vibration reduction device consists of a mass m 2 、Spring 44k 2 and damping c 2 The displacement of the reverse vibration damping device is x 2 .

[0030] After installing the reverse vibration reduction device, the motion equation of the condensate pump system is:

[0031]

[0032] Among them, f 2 (t) = F 2 e jωt F is the force exerted by the reverse vibration reduction device on the top of the condensate pump motor, 2 is the amplitude of the force acting on the reverse vibration reduction device.

[0033] The system vibration response can be written as:

[0034] x 2 =X 2 e jωt (2)

[0035] Among them, X 1 , X 2 is the response amplitude. After derivation, we can get:

[0036]

[0037]

[0038]

[0039] Introduce the following parameters:

[0040] Natural frequency of condensate pump system;

[0041] Natural frequency of the reverse vibration damping device;

[0042] ξ 1 =c 1 / (2m 1 ω 1 ): damping ratio of condensate pump system;

[0043] ξ 2 =c 2 / (2m 2 ω 2 ): Damping ratio of reverse vibration reduction device;

[0044] μ=m 2 / m 1 : The mass ratio of the reverse vibration reduction device to the condensate pump system;

[0045] γ=ω 2 / ω 1 : The natural frequency ratio of the reverse vibration reduction device and the condensate pump system;

[0046] s=ω / ω 1 : Forced vibration frequency ratio.

[0047] The above formula can be rewritten as:

[0048]

[0049] Given the frequency that needs to be damped, if the natural frequency of the reverse vibration damping device is adjusted to the frequency point that needs to be damped, at this time γ = s = 1, equation (4) becomes:

[0050]

[0051] The damping of the condensate pump system is relatively small and can be ignored. 1 =0, formula (5) can be further simplified as:

[0052]

[0053] remember:

[0054]

[0055] in, Represents the real and imaginary parts of a complex number respectively.

[0056] The angle α between the force of the reverse vibration reduction device on the motor and the original exciting force on the condensing pump is:

[0057]

[0058] It can be seen from equations (7) and (8) that by selecting appropriate coefficients μ (mass ratio of the reverse vibration reduction device to the condensate pump system) and ξ 2 (damping ratio of the reverse vibration reduction device) makes the force of the reverse vibration reduction device acting on the motor and the original exciting force on the condensing pump opposite to each other, thereby achieving the goal of reducing vibration.

[0059] The installation steps of the present invention are:

[0060] (1) Set the direction and frequency point where vibration reduction is required, denoted as ω 2 ;

[0061] (2) The mass of the main mass block 3 is set to m2, and the mass ratio of the reverse vibration reduction device to the condensate pump system is denoted as μ;

[0062] (3) Calculating the stiffness k2 of the spring 44: Select the number of groups of springs 44. Assuming that one of the regulating mass components 4 has 5 groups of springs 44, a total of 10 groups, the stiffness k of each group of springs 44 is calculated as follows:

[0063] k=k 2 / m

[0064] Wherein, m is the number of spring 44 groups.

[0065] (4) Calculate the damping required by the reverse vibration reduction device. Damping ξ 2 Take the value [0.01, 1.0], and calculate the angle α between the force of the reverse vibration reduction device on the motor and the original exciting force on the condensate pump under different damping conditions:

[0066]

[0067]

[0068] According to the principle of α=180°, select the damping ξ required by the reverse vibration reduction device 2 value.

[0069] (5) Silicone oil is injected into the gap between the spring 44 and the main mass block 3 inside the reverse vibration reduction device.

[0070] (6) Using a hammer to apply an impact force to the main mass block 3 along the vibration reduction direction, testing the vibration response of the main mass block 3 along the vibration reduction direction under the impact force, and using a dynamic signal analyzer to measure the signal spectrum to obtain the main frequency point in the signal, such as Figure 4 shown. Figure 4 The main frequency is 18.75Hz.

[0071] (7) If the main frequency point obtained by the test deviates from the design frequency point ω 2 , the deviation is △ω 2 , adjust the mass of the reverse vibration damping device to change the frequency. There are two modes to change the mass of the reverse vibration damping device. When making a large adjustment, the main mass block 3 can be removed from the fixing member 41 and moved to the receiving member 42; when making a small adjustment, the main mass block 3 can be increased or decreased in the column housing. Adjustment amount of reverse vibration damping device △m 2 The calculation method is as follows:

[0072]

[0073] (8) Use a hammer to apply an impact force to the main mass block 3 along the vibration reduction direction, and test the vibration response of the main mass block 3 along the vibration reduction direction under the impact force. Under the action of damping, the vibration response under impact excitation shows exponential decay, such as Figure 4 shown.

[0074] Calculate the damping ξ of the reverse vibration reduction device based on the attenuation response signal within n cycles 2 :

[0075]

[0076] (9) If the damping is too large, suck out some of the silicone oil; if the damping is too small, inject some silicone oil until the damping of the reverse vibration reduction device meets the requirements.

[0077] (10) Install the reverse vibration reduction device on the upper part of the condensate pump motor in the direction of vibration reduction design.

[0078] A reverse vibration reduction device for a vertical condensate pump in a power plant according to the present invention, wherein a plurality of through holes are provided on the adjusting mass block 43, wherein the aperture of the through holes is larger than the outer diameter of the spring 44, and the spring 44 can be extended and retracted after passing through the through holes of the adjusting mass block 43; by giving a mass ratio between the reverse vibration reduction device and the condensate pump, the stiffness of the spring 44 is adjusted to meet the vibration reduction frequency point requirement; the damping of the reverse vibration reduction device is adjusted so that the exciting force of the reverse vibration reduction device on the condensate pump motor is opposite to the exciting force of the condensate pump itself, thereby achieving the goal of reducing the exciting force.

[0079] Furthermore, the main counterweight shell 2 includes a frame 21, a limit screw 22 and a limit nut 23; the frame 21 is fixedly connected to the main shell 1 and is located on the inner side of the main shell 1; the limit screw 22 is fixedly connected to the frame 21 and is located on the inner side of the frame 21; the limit nut 23 is threadedly connected to the limit screw 22 and is located on the side of the limit screw 22.

[0080] In this embodiment, the main mass block 3 is provided with a through hole adapted to the limit screw 22. The main mass block 3 is placed on the limit screw 22, and the limit nut 23 is tightened on the limit screw 22, and the limit nut 23 is pressed against the main mass block 3, so that the main mass block 3 can be fixed. According to this method, the main mass block 3 can be increased or decreased; the number of the limit screw 22 and the limit nut 23 can be set to multiple to improve the fixing effect of the main mass block 3.

[0081] Furthermore, the fixing component 41 includes a plurality of fixing screws 411 and a plurality of fixing nuts 412; the plurality of fixing screws 411 are respectively fixedly connected to the main shell 1, and respectively penetrate the plurality of adjusting mass blocks 43, and are respectively located on the inner side of the main shell 1; the plurality of fixing nuts 412 are respectively threadedly connected to the plurality of fixing screws 411, and are respectively located on the sides of the plurality of fixing screws 411.

[0082] In this embodiment, the adjusting mass block 43 is provided with a through hole adapted to the fixing screw 411, and the position of the adjusting mass block 43 can be limited by the fixing nut 412. When the adjusting mass block 43 needs to be moved to the supporting member 42, the fixing nut 412 is unscrewed from the fixing nut 412 to release the fixation of the adjusting mass block 43.

[0083] Furthermore, the receiving component 42 includes a plurality of receiving screws 421 and a plurality of receiving nuts 422; the plurality of receiving screws 421 are respectively fixedly connected to the frame body 21 and are respectively located on the sides of the frame body 21; the plurality of receiving nuts 422 are respectively threadedly connected to the plurality of receiving screws 421 and are respectively located on the sides of the plurality of receiving screws 421.

[0084] In this embodiment, the outer diameter of the receiving screw 421 is the same as the outer diameter of the fixed screw 411. After the adjusting mass block 43 is removed from the fixed screw 411, the adjusting mass block 43 is slid along the spring 44 onto the receiving screw 421, and then the receiving nut 422 is screwed onto the receiving screw 421 so that the receiving nut 422 presses the adjusting mass block 43 tightly to complete the fixation.

[0085] Furthermore, the main shell includes a shell 11, two reinforcing plates 12 and a sealing cover 13; the two reinforcing plates 12 are respectively fixedly connected to the shell 11 and are respectively located inside the shell 11; the sealing cover 13 is respectively fixedly connected to the two reinforcing plates 12 and is located on the top of the two reinforcing plates 12.

[0086] In this embodiment, the shell 11 is used to provide support for the main counterweight shell and the adjustment mass assembly, the two reinforcing plates 12 enhance the strength of the shell 11 and support the spring at the same time, the sealing cover 13 and the reinforcing plate 12 are connected by bolts, and the sealing cover 13 is used to seal the shell 11.

[0087] In a second aspect, the present invention further provides a method for reverse vibration reduction of a vertical condensate pump in a power plant, comprising:

[0088] S1 injects silicone oil into the gap between the spring 44 and the main mass block 3;

[0089] First, set the direction and frequency point of vibration reduction, denoted as ω 2 ; Set the mass m2 of the main mass block 3, and record the mass ratio of the reverse vibration reduction device to the condensate pump system as μ; Calculate the stiffness k2 of the spring 44: Select the number of springs 44. Assume that one of the adjustment mass components 4 has 5 groups of springs 44, a total of 10 groups, and the stiffness k of each group of springs 44 is calculated as follows:

[0090] k=k 2 / m

[0091] Wherein, m is the number of spring 44 groups.

[0092] Calculate the required damping for the counter vibration reduction device. Damping ξ 2Take the value [0.01, 1.0], and calculate the angle α between the force of the reverse vibration reduction device on the motor and the original exciting force on the condensate pump under different damping conditions:

[0093]

[0094]

[0095] According to the principle of α=180°, select the damping ξ required by the reverse vibration reduction device 2 value.

[0096] Silicone oil is injected into the gap between the spring 44 and the main mass block 3 inside the reverse vibration damping device.

[0097] S2 tests the actual frequency of the power plant vertical condensate pump reverse vibration reduction device, and adjusts the number of the main mass block 3 and the adjustment mass block 43 until the actual frequency is the same as the preset frequency;

[0098] The actual frequency of the reverse vibration reduction device of the vertical condensate pump of the power plant is tested. An impact force is applied to the main mass block 3 along the vibration reduction direction by a hammer. The vibration response of the main mass block 3 along the vibration reduction direction under the impact force is tested. The signal spectrum is measured by a dynamic signal analyzer to obtain the main frequency point in the signal, such as Figure 4 shown. Figure 4 The main frequency is 18.75Hz. If the main frequency point obtained by the test deviates from the design frequency point ω 2 , the deviation is △ω 2 , adjust the mass of the reverse vibration damping device to change the frequency until the actual frequency is the same as the preset frequency. There are two modes to change the mass of the reverse vibration damping device. When making a large adjustment, the main mass block 3 can be removed from the fixing member 41 and moved to the receiving member 42; when making a small adjustment, the main mass block 3 can be increased or decreased in the cylindrical shell. Reverse vibration damping device adjustment amount △m 2 The calculation method is as follows:

[0099]

[0100] S3 tests the actual damping of the reverse vibration reduction device of the vertical condensate pump of the power plant, and adjusts the amount of silicone oil until the actual damping is the same as the preset damping;

[0101] To test the actual damping of the vertical condensate pump reverse vibration reduction device of the power plant, a hammer is used to apply an impact force to the main mass block 3 along the vibration reduction direction, and the vibration response of the main mass block 3 along the vibration reduction direction under the impact force is tested. Under the action of damping, the vibration response under impact excitation shows exponential decay, such as Figure 4 shown.

[0102] Calculate the damping ξ of the reverse vibration reduction device based on the attenuation response signal within n cycles 2 :

[0103]

[0104] If the damping is too large, some of the silicone oil is sucked out; if the damping is too small, some of the silicone oil is injected until the actual damping is the same as the preset damping.

[0105] S4: installing the power plant vertical condensate pump reverse vibration reduction device on the upper part of the condensate pump motor in the vibration reduction design direction as the installation direction;

[0106] Install the reverse vibration reduction device on the upper part of the condensate pump motor in the direction of vibration reduction design.

[0107] The present invention discloses a reverse vibration reduction method for a vertical condensate pump in a power plant. After the frequency point at which the condensate pump needs to be reduced and the vibration parameter mass of the condensate pump are given, a corresponding vibration reduction device is designed according to the method proposed by the present invention, which can have a better vibration reduction effect on the condensate pump.

[0108] What is disclosed above is only a preferred embodiment of the present invention, and it certainly cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made according to the claims of the present invention still fall within the scope of the invention.

Claims

1. A method for reverse vibration reduction of a vertical condensate pump in a power plant, applied to a reverse vibration reduction device of a vertical condensate pump in a power plant, characterized in that: The reverse vibration reduction device for the vertical condensate pump of a power plant comprises a main body shell, a main counterweight shell, a plurality of main mass blocks and two regulating mass components; The main counterweight shell is fixedly connected to the main body shell and is located inside the main body shell; The plurality of main mass blocks are detachably connected to the main counterweight shell and are respectively located on the inner side of the main counterweight shell; the adjusting mass assembly comprises a fixing member, a receiving member, a plurality of adjusting mass blocks and a plurality of springs; the fixing member is fixedly connected to the main counterweight shell and is located on the side of the main counterweight shell; the receiving member is fixedly connected to the main shell and is located on the inner side of the main shell; the plurality of adjusting mass blocks are detachably connected to the fixing member and are respectively located on the side of the fixing member; The plurality of springs are respectively fixedly connected to the main counterweight shell, and are respectively fixedly connected to the main body shell, and are respectively located between the main counterweight shell and the main body shell, and the plurality of springs respectively penetrate the plurality of regulating mass blocks; the two regulating mass components are mirror-imaged on both sides of the main counterweight shell; The condensate pump is regarded as a system consisting of mass m1, spring 44k1 and damping c1. The displacement of the system is x1, and the exciting force f1(t) = F1e acts on it. jωt , the amplitude is F1, the frequency is ω, and a reverse vibration reduction device is designed above the condensate pump. The reverse vibration reduction device consists of mass m2, spring 44k2 and damping c2. The displacement of the reverse vibration reduction device is x2. After installing the reverse vibration reduction device, the motion equation of the condensate pump system is: Where f2(t) = F2e jωt is the force of the reverse vibration reduction device acting on the top of the condensate pump motor, F2 is the amplitude of the force of the reverse vibration reduction device, The system vibration response is written as: x2=X2e jωt (2) Among them, X1 and X2 are the response amplitudes, which can be deduced as follows: Introduce the following parameters: Natural frequency of condensate pump system; Natural frequency of the reverse vibration damping device; ξ1=c1 / (2m1ω1): damping ratio of condensate pump system; ξ2=c2 / (2m2ω2): damping ratio of the reverse vibration reduction device; μ=m2 / m1: mass ratio of reverse vibration reduction device to condensate pump system; γ=ω2 / ω1:Ratio of natural frequency between reverse vibration reduction device and condensing pump system; s=ω / ω1:Forced vibration frequency ratio, The above formula can be rewritten as: Given the frequency that needs to be damped, if the natural frequency of the reverse vibration damping device is adjusted to the frequency point that needs to be damped, at this time γ = s = 1, equation (4) becomes: The damping of the condensate pump system is relatively small and can be ignored. At this time, ξ1=0, and equation (5) is further simplified to: remember: in, Represent the real and imaginary parts of a complex number, respectively. The angle α between the force of the reverse vibration reduction device on the motor and the original exciting force on the condensing pump is: From equations (7) and (8), it can be seen that by selecting appropriate coefficients μ, i.e., the mass ratio of the reverse vibration reduction device to the condensing pump system, and ξ2, i.e., the damping ratio of the reverse vibration reduction device, the force of the reverse vibration reduction device on the motor is opposite to the original exciting force on the condensing pump, and the vibration is reduced. The reverse vibration reduction method for a vertical condensate pump in a power plant comprises: Inject silicone oil into the gap between the spring and the main mass; Testing the actual frequency of the reverse vibration reduction device of the vertical condensate pump of the power plant, and adjusting the number of the main mass block and the adjustment mass block until the actual frequency is the same as the preset frequency; Testing the actual damping of the reverse vibration reduction device of the vertical condensate pump of the power plant, and adjusting the amount of silicone oil until the actual damping is the same as the preset damping; The power plant vertical condensate pump reverse vibration reduction device is installed on the upper part of the condensate pump motor with the vibration reduction design direction as the installation direction.

2. A method for reverse vibration reduction of a vertical condensate pump in a power plant according to claim 1, characterized in that: The main counterweight shell includes a frame, a limiting screw and a limiting nut; the frame is fixedly connected to the main shell and is located on the inner side of the main shell; the limiting screw is fixedly connected to the frame and is located on the inner side of the frame; the limiting nut is threadedly connected to the limiting screw and is located on the side of the limiting screw.

3. A method for reverse vibration reduction of a vertical condensate pump in a power plant according to claim 1, characterized in that: The fixing component includes a plurality of fixing screws and a plurality of fixing nuts; the plurality of fixing screws are respectively fixedly connected to the main shell, respectively penetrate the plurality of adjusting mass blocks, and are respectively located on the inner side of the main shell; the plurality of fixing nuts are respectively threadedly connected to the plurality of fixing screws, and are respectively located on the sides of the plurality of fixing screws.

4. A method for reverse vibration reduction of a vertical condensate pump in a power plant according to claim 2, characterized in that: The receiving component includes a plurality of receiving screws and a plurality of receiving nuts; the plurality of receiving screws are respectively fixedly connected to the frame and are respectively located at the sides of the frame; the plurality of receiving nuts are respectively threadedly connected to the plurality of receiving screws and are respectively located at the sides of the plurality of receiving screws.

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