Inerter particle damping dynamic vibration absorption system based on reciprocating pump and design method

Abstract

The invention discloses an inerter particle damping dynamic vibration absorption system based on a reciprocating pump and a design method. The inerter particle damping dynamic vibration absorption system comprises a spring, the reciprocating pump connected with the spring, a driving impeller unit arranged at the top of the reciprocating pump and a particle damping inerter stirring unit arranged at the top of the driving impeller unit. The reciprocating pump comprises a pump shell, a pump rod and a valve clack; the driving impeller unit comprises an impeller shell arranged at the top of the pump shell and a driving impeller arranged in the impeller shell; the particle damping inerter stirring unit comprises an inerter shell arranged at the top of the impeller shell, damping particles arranged in the inerter shell and a stirring impeller; the driving impeller and the stirring impeller are coaxially connected through an impeller rod; a liquid inlet pipe and a liquid outlet pipe are arranged between the pump shell and the impeller shell; working liquid is pressurized through the reciprocating pump and then drives the driving impeller to rotate, the coaxial stirring impeller is driven to stir the damping particles to rotate, the rotating motion of the damping particles except the up-down motion of the reciprocating pump is achieved, and therefore the vibration absorption effect is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of vibration absorption equipment, and more specifically, relates to an inertial particle damping dynamic vibration absorption system based on a reciprocating pump and a design method thereof. Background Art

[0002] A vibration absorber is a device that uses a resonance system to absorb the vibration energy of an object to reduce the vibration of the object. It attaches a mass-spring resonance system to the vibrating object, i.e., the main mass, and the reaction force generated during resonance can reduce the vibration of the vibrating object. When the frequency of the exciting force is equal to the natural frequency of the auxiliary mass-spring system, the amplitude of the main mass will become zero. At this time, the exciting force is completely converted into the vibration of the auxiliary mass-spring system, and the force of the auxiliary spring acting on the main mass is always equal to the magnitude of the exciting force and opposite in direction, so the resultant force on the main mass is zero, so that the main mass remains motionless. Traditional dynamic vibration absorbers are mainly spring mass blocks and cantilever beam mass blocks. Generally, the auxiliary mass is required to be one-tenth of the main mass in order to have a good narrow-band or even single-frequency vibration reduction effect. However, the actual frequency spectrum is rich, the frequency band range to be absorbed is wide, and the requirements for the additional mass are strict. Traditional dynamic vibration absorbers often cannot meet the requirements. In addition, traditional dynamic vibration absorbers are only effective within a very narrow range of natural frequencies, and are prone to resonance peaks in the adjacent frequency bands, which do not have the corresponding vibration reduction effect. Therefore, the natural frequency of the additional spring-mass system is very close to the frequency spectrum to be absorbed, which makes installation and adjustment difficult, further limiting the application of dynamic vibration absorbers.

[0003] Inertial vibration reduction is a new type of energy efficiency technology proposed in recent years. Inertial vibration reduction mainly uses racks and gears or ball screws to rotate the flywheel, thereby generating a virtual mass that is tens to thousands of times the physical mass. It is currently widely used in the field of building vibration reduction; however, the vibration amplitude on the surface of the power equipment is relatively small compared to the vibration amplitude of the building, and the vibration frequency is high. The flywheel has not yet accelerated to a higher speed and has to reverse or lose power input, which limits the application of inertial vibration reduction in power equipment. For ship environments, size and space restrictions are more stringent, and the vibrations that need to be controlled are concentrated in low frequencies, which means that the mass of the vibration absorber needs to be large to achieve a good vibration reduction and noise reduction effect, which also limits the application of vibration absorbers. Summary of the invention

[0004] In view of the above defects or improvement needs of the prior art, the present invention provides a reciprocating pump-based inertial particle damping dynamic vibration absorption system and design method, which drives the driving impeller to rotate after pressurizing the working fluid using the reciprocating pump, and the rotating driving impeller drives the coaxial stirring impeller to stir the damping particles, so that the damping particles rotate, thereby realizing the particle damping rotational motion in addition to the up and down motion of the reciprocating pump, thereby increasing the vibration absorption effect; it can solve the problems of wide-band absorption, difficult installation and adjustment, and application limitations of traditional vibration absorption systems in specific environments, thereby improving the performance and application range of the vibration absorption system.

[0005] In order to achieve the above-mentioned object, one aspect of the present invention provides a reciprocating pump-based inertial particle damping dynamic vibration absorption system, comprising a spring, a reciprocating pump connected to the spring, a driving impeller unit arranged at the top of the reciprocating pump, and a particle damping inertial stirring unit arranged at the top of the driving impeller unit; wherein,

[0006] The reciprocating pump comprises a pump housing, a pump rod and a valve disc arranged inside the pump housing; one end of the spring is fixed to the vibration force device to be absorbed, and the other end is connected to the bottom of the pump housing; one end of the pump rod is inserted into the interior of the spring and fixed to the vibration force device to be absorbed, and the other end extends into the interior of the pump housing from the bottom center of the pump housing;

[0007] The driving impeller unit comprises an impeller shell arranged at the top of the pump shell, and a driving impeller arranged inside the impeller shell; the particle damping inertial volume stirring unit comprises an inertial volume shell arranged at the top of the impeller shell, damping particles and a stirring impeller arranged inside the inertial volume shell; the driving impeller and the stirring impeller rotate coaxially and in the same direction through an impeller rod commonly arranged at the center to form a series inertial volume;

[0008] A liquid inlet pipe is provided between the bottom of one side of the pump housing and the side of the impeller housing; a liquid discharge pipe is provided between the bottom of the other side of the pump housing and the bottom of the impeller housing;

[0009] The working fluid is pressurized by a reciprocating pump to drive the driving impeller to rotate. The rotating driving impeller drives the coaxial stirring impeller to stir the damping particles, causing the damping particles to rotate, thereby realizing the rotational movement of the damping particles in addition to the up and down movement of the reciprocating pump, thereby increasing the vibration absorption effect.

[0010] Furthermore, an upper bearing is provided at the top center of the inertia housing;

[0011] A lower bearing is provided at the top center of the pump housing;

[0012] One end of the impeller rod is connected to the lower bearing, the middle passes through the top center of the impeller shell, and the other end is connected to the upper bearing.

[0013] Furthermore, a dynamic seal is provided at the connection between the pump rod and the pump housing;

[0014] A rotary dynamic seal is provided at the connection between the impeller rod and the impeller shell.

[0015] Furthermore, an outlet one-way valve is provided at the junction of the liquid inlet pipe and the pump housing; and a one-way inlet valve is provided at the junction of the liquid discharge pipe and the pump housing.

[0016] Furthermore, a tangential throttling nozzle is provided at the junction of the impeller housing and the liquid inlet pipe, which is used to spray the working fluid in the pump housing onto the driving impeller.

[0017] Furthermore, a cooler is connected to the liquid inlet pipe.

[0018] Furthermore, the impeller housing and the inertia casing, as well as the impeller housing and the pump housing are fixed and sealed to ensure that the working fluid circulates inside and prevent liquid leakage.

[0019] Furthermore, the particle size of the damping particles is 0.5 to 10 mm, and the space filling rate is 20% to 95%; the damping particles are spherical particles, elliptical particles or irregularly shaped particles.

[0020] Furthermore, the damping particles are made of stainless steel particles, iron particles, ceramic particles, copper particles, or tungsten carbide particles.

[0021] The second aspect of the present invention provides a design method of a reciprocating pump-based inertial particle damping dynamic vibration absorption system, which is implemented by using the reciprocating pump-based inertial particle damping dynamic vibration absorption system, and includes the following steps:

[0022] S1: Calculate the required stiffness of the vibration absorbing system according to the total static mass and initial static displacement of the vibration absorbing system allowed;

[0023] S2: Calculating the apparent mass of the vibration absorbing system according to the stiffness required by the vibration absorbing system and the excitation force frequency of the vibration absorbing device to be absorbed;

[0024] S3: Select the specifications and models of the existing tangential throttling nozzle and the mass flow rate of the reciprocating pump, and calculate the nozzle injection speed according to the caliber of the tangential throttling nozzle on the vibration absorption system;

[0025] S4: Based on the fact that the kinetic energy of the fluid ejected from the nozzle is equal to the kinetic energy and momentum of the damping particles rotating during the working process of the reciprocating pump 5, the driving impeller unit 7, and the particle damping inertia stirring unit 8, multiple combinations of damping particle mass, damping particle diameter, and filling rate are calculated by simulation means;

[0026] S5: Determine whether the total static mass of the vibration absorption system is greater than the mass of the damping particles, the mass flow of the reciprocating pump, and the sum of the static mass excluding the mass flow of the reciprocating pump and the mass of the damping particles; if so, the selection of the tangential throttling nozzle is completed, otherwise repeat steps S3 to S5, and reselect the flow of the reciprocating pump or the model of the tangential throttling nozzle until the requirements are met.

[0027] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0028] (1) The present invention is a reciprocating pump-based inertial particle damping dynamic vibration absorption system, in which the high-speed rotation of the driving impeller drives the coaxial stirring impeller to rotate at a high speed, thereby stirring the damping particles inside the inertial shell. Under the action of the stirring impeller, the damping particles move at a high speed, and the vibration energy is consumed by friction and collision between the particles; the up and down vibration energy to be absorbed is converted into the suction action of the reciprocating pump, and the throttling impact action of the high-pressure fluid is used to drive the driving impeller to drive the stirring impeller to stir the damping particles to consume the work; the vibration generated by the vibration force equipment to be absorbed is reduced by the periodic up and down motion of the reciprocating pump and the dynamic rotation of the damping particles.

[0029] (2) The present invention is an inertial particle damping dynamic vibration absorption system based on a reciprocating pump, wherein one end of a spring is fixed to the vibration force device to be absorbed, and the other end is connected to the bottom of the pump casing, one end of a pump rod is inserted into the interior of the spring and fixed to the vibration force device to be absorbed, and the other end extends from the bottom center of the pump casing into the interior of the pump casing and is fixed to the valve disc; an impeller shell is arranged at the top of the pump casing, a driving impeller is arranged inside the impeller shell, an inertial shell at the top of the impeller shell, and damping particles and a stirring impeller are arranged inside the inertial shell; the driving impeller and the stirring impeller rotate coaxially and in the same direction through an impeller rod arranged at the center to form a series inertial container; a liquid inlet pipe and a liquid discharge pipe are arranged between the pump casing and the impeller casing; the working liquid is pressurized by the reciprocating pump and then driven to rotate the driving impeller, and the rotating driving impeller drives the coaxial stirring impeller to stir the damping particles, so that the damping particles rotate, thereby realizing the rotational movement of the damping particles in addition to the up and down movement of the reciprocating pump, thereby increasing the vibration absorption effect. The present invention integrates the advantages of inertial volume type, particle damping type and traditional dynamic vibration absorber, with smaller mass and better vibration absorption effect; the present invention provides an outlet check valve at the junction of the liquid inlet pipe and the pump casing, a one-way inlet valve at the junction of the liquid discharge pipe and the pump casing, and a tangential throttling nozzle at the junction of the impeller shell and the liquid inlet pipe. By utilizing the working characteristics of the reciprocating pump, supplemented by a check valve and a throttling nozzle, the problem of reduced rotation speed of the rotating mass when the inertial volume is reversed or the vibration is reversed is avoided, thereby achieving the purpose of increasing the virtual mass of the inertial volume and making the virtual mass more stable; the present invention stirs the particle damping at high speed, so that the number of collisions between particles per unit time is increased, thereby increasing the consumption of vibration absorption energy and producing a higher vibration absorption effect; the present invention connects a cooler to the liquid inlet pipe, and the particle damping heat is taken away in time by the cooler to avoid excessive temperature rise of the vibration absorber, causing particle damping expansion, affecting the stirring effect, and then affecting the vibration absorption effect.

[0030] (3) The inertia particle damping dynamic vibration absorption system based on a reciprocating pump of the present invention has an integrated inertia container which is significantly different from the traditional spiral tube hydraulic inertia container. It no longer relies on the rotation of an external spiral tube to achieve speed amplification, but relies on a throttling nozzle to achieve it. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic structural diagram of a reciprocating pump-based inertial particle damping dynamic vibration absorption system according to an embodiment of the present invention;

[0032] Figure 2 This is a schematic diagram of the working principle of an inertial particle damping dynamic vibration absorption system based on a reciprocating pump according to an embodiment of the present invention;

[0033] Figure 3 The present invention is a flowchart of a method for designing an inertial particle damping dynamic vibration absorption system based on a reciprocating pump according to an embodiment of the present invention.

[0034] In all the drawings, the same reference numerals represent the same technical features, specifically: 1-spring, 2-dynamic seal, 3-one-way inlet valve, 4-discharge pipe, 5-reciprocating pump, 51-pump housing, 6-valve disc, 7-driving impeller unit, 71-impeller housing, 8-particle damping inertial mixing unit, 81-inertial mixing housing, 9-damping particles, 10-rotating dynamic seal, 11-upper bearing 12-impeller rod, 13-mixing impeller, 14-driving impeller, 15-tangential throttling nozzle, 16-lower bearing, 17-pump rod, 18-cooler, 19-inlet pipe, 20-outlet one-way valve, 21-working fluid. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0036] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, when an element is referred to as being "fixed to", "disposed on" or "provided on" another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or indirectly connected to the other element; the terms "installed", "connected", "connected" and "provided with" should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal connection of the two elements or the interaction relationship between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0037] like Figure 1As shown, one aspect of the present invention provides a reciprocating pump-based inertial particle damping dynamic vibration absorption system, comprising a spring 1, a reciprocating pump 5 connected to the spring 1, a driving impeller unit 7 arranged at the top of the reciprocating pump 5, and a particle damping inertial volume stirring unit 8 arranged at the top of the driving impeller unit 7; wherein the reciprocating pump 5 comprises a pump casing 51, a pump rod 17 arranged inside the pump casing 51, and a valve flap 6; one end of the spring 1 is fixed to the vibration force device to be absorbed, and the other end is connected to the bottom of the pump casing 51; one end of the pump rod 17 is inserted into the interior of the spring 1 and fixed to the vibration force device to be absorbed, and the other end extends into the interior of the pump casing 51 from the bottom center of the pump casing 51; the driving impeller unit 7 comprises an impeller casing 71 arranged at the top of the pump casing 51, and a driving impeller 14 arranged inside the impeller casing 71; the particle The damped inertial stirring unit 8 includes an inertial casing 81 arranged at the top of the impeller casing 71, damping particles 9 and a stirring impeller 13 arranged inside the inertial casing 81; the driving impeller 14 and the stirring impeller 13 rotate coaxially and in the same direction through an impeller rod 12 commonly arranged at the center to form a series inertial container; a liquid inlet pipe 19 is provided between the bottom of one side of the pump casing 51 and the side of the impeller casing 71; a liquid discharge pipe 4 is provided between the bottom of the other side of the pump casing 51 and the bottom of the impeller casing 71; the present invention drives the driving impeller 14 to rotate after pressurizing the working liquid 21 by using a reciprocating pump 5, and the rotating driving impeller 14 drives the coaxial stirring impeller 13 to stir the damping particles 9, so that the damping particles 9 rotate, thereby realizing the particle damping rotational motion in addition to the up and down motion of the reciprocating pump, thereby increasing the vibration absorption effect.

[0038] Furthermore, if Figure 1As shown, an upper bearing 11 is provided at the top center of the inertial volume casing 81; a lower bearing 16 is provided at the top center of the pump casing 51; one end of the impeller rod 12 is connected to the lower bearing 16, passes through the top center of the impeller casing 71 in the middle, and the other end is connected to the upper bearing 11; a dynamic seal 2 is provided at the connection between the pump rod 17 and the pump casing 51; a rotating dynamic seal 10 is provided at the connection between the impeller rod 12 and the impeller casing 71; the inertial volume casing 81 usually needs to have sufficient strength and rigidity to withstand internal dynamic pressure and external environmental influences. The pressure resistance, temperature resistance and corrosion resistance of the material should be considered during design; the design of the upper bearing 11 and the lower bearing 16 needs to take into account the supported load, speed, and operating environment; the impeller rod 12 connects the upper and lower bearings and needs to withstand the torque and axial force transmitted by the impeller. Its design should take into account the fatigue strength and torsion resistance of the material; the design of the pump casing 51 should take into account the fluid dynamic characteristics to reduce energy loss and improve efficiency. The material selection should consider corrosion resistance and pressure resistance; the dynamic seal 2 is used to control the leakage of fluid or gas, and needs to have good sealing performance and wear resistance; the rotary dynamic seal 10 is used to seal the rotating shaft, and the speed, pressure and temperature should be considered during the design. The rotary dynamic seal needs to have low friction, high wear resistance and good sealing performance.

[0039] Furthermore, if Figure 1 As shown, the liquid inlet pipe 19 is used to introduce the working liquid 21 from the pump housing 51 into the impeller housing 71 to ensure that the liquid can only flow in one direction; an outlet one-way valve 20 is provided at the junction of the liquid inlet pipe 19 and the pump housing 51 to prevent the working liquid 21 in the pump housing 51 from flowing back when the system is not working or the pressure drops, ensuring that the liquid can only flow out of the liquid inlet pipe 19 and cannot return, thereby maintaining the positive flow of the system liquid; a tangential throttling nozzle 15 is provided at the junction of the impeller housing 71 and the liquid inlet pipe 19 to spray the working liquid 21 in the pump housing 51 onto the driving impeller 14 , providing power for the system; the design of the tangential throttling nozzle 15 allows the working liquid 21 to be sprayed into the impeller housing 71 in a tangential manner, which can effectively transmit power and drive the driving impeller 14 to rotate; the function of the discharge pipe 4 is to guide the working liquid 21 in the impeller housing 71 back to the pump housing 51; a one-way inlet valve 3 is provided at the junction of the discharge pipe 4 and the pump housing 51, which is used to make the working liquid 21 in the impeller housing 71 only flow back to the pump housing 51 from the discharge pipe 4, and the working liquid 21 inside the pump housing 51 cannot flow from the discharge pipe to the impeller housing 71, ensuring that the liquid can only flow in one direction. The inlet pipe 19 is connected to a cooler 18, which is used to prevent the working liquid 21 from heating up due to long-term operation and affecting the life of the device; the cooler 18 reduces the liquid temperature through heat exchange to keep the system running within a suitable temperature range.

[0040] Furthermore, if Figure 1As shown, by fixing the pump rod 17 to the vibration force device to be absorbed, it is ensured that the movement of the reciprocating pump 5 can be directly transmitted to the vibration force device to be absorbed; one end of the spring 1 is fixed to the pump housing 51 of the reciprocating pump 5, and the other end is fixed to the vibration force device to be absorbed; the spring provides elastic force to help the vibration force device to be absorbed absorb and isolate vibration; the impeller shell 71 and the inertia shell 81, and the impeller shell 71 and the pump shell 51 are fixed and sealed to ensure that the working fluid 21 circulates inside to prevent liquid leakage; the particle size of the damping particles 9 is 0.5 to 10 mm, and the space filling rate is 20% to 95%; the damping particles 9 can be spherical particles, elliptical particles, and irregularly shaped particles; the material of the particles can be stainless steel particles, iron particles, ceramic particles, copper particles, and tungsten carbide particles; the liquid inlet pipe 19 and the liquid discharge pipe 4 are both flexible pipes, which help to reduce the vibration transmitted from the reciprocating pump 5 to the cooler 18, thereby protecting the cooler 18 from vibration and extending its service life.

[0041] The present invention provides a reciprocating pump-based inertial particle damping dynamic vibration absorption system. When the pump housing 51 of the reciprocating pump 5 vibrates downward with the vibration of the vibration force equipment to be absorbed, the pump rod 17 drives the valve flap 6 to move upward relative to the pump housing 51, so that the internal space of the pump housing 51 increases, and the working liquid in the impeller housing 71 is sucked, so that the working liquid 21 enters the pump housing 51 through the discharge pipe 4 and the one-way inlet valve 3; then the pump housing 51 moves upward, and the pump rod 17 drives the valve flap 6 to move downward relative to the pump housing 51, so that the working liquid 21 in the pump housing 51 is pressurized; the pressurized working liquid 21 enters the cooler 18 through the one-way outlet valve 20, and after the working liquid 21 is cooled by the cooler 18, it controls the liquid flow rate and pressure through the tangential throttling nozzle 15, and further After lowering the temperature of the liquid, it is sprayed toward the driving impeller 14, which drives the driving impeller 14 to rotate at a high speed, thereby converting the kinetic energy of the working liquid 21 into mechanical energy; the high-speed rotation of the driving impeller 14 drives the coaxial stirring impeller 13 to rotate at a high speed, thereby stirring the damping particles 9 inside the inertia shell 81, and the damping particles 9 move at a high speed under the action of the stirring impeller 13, and consume the vibration energy through friction and collision between particles; the present invention converts the up and down vibration energy to be absorbed into the suction action of the reciprocating pump, and utilizes the throttling impact action of the high-pressure fluid to drive the driving impeller 14 to drive the stirring impeller 13 to stir the damping particles 9 to consume the work; the vibration generated by the vibration force equipment to be absorbed is reduced through the periodic up and down movement of the reciprocating pump 5 and the dynamic rotation action of the damping particles 9.

[0042] like Figure 2As shown, it is a principle diagram of the vibration absorption system of the present invention, wherein K0 is the stiffness of the vibration absorption force device to be absorbed; M0 is the mass of the vibration absorption force device to be absorbed; K1 is the stiffness of the vibration absorption system itself; C1 is the stiffness damping of the vibration absorption system itself. When the damping C1 is 0, the amplitudes of the vibration absorption force device to be absorbed and the vibration absorption system are respectively expressed by formula (1) and formula (2):

[0043]

[0044] Among them, X st is the initial static displacement of the vibration absorbing system, f j is the excitation force frequency of the vibration force equipment to be absorbed; f1 is the natural frequency of the vibration absorption system without damping; f0 is the initial natural frequency of the vibration force equipment to be absorbed;

[0045] The natural frequency f1 of the vibration absorption system without damping is expressed by formula (3):

[0046]

[0047] Where M1 is the apparent mass of the vibration absorption system, which can be expressed by formula (4):

[0048] M1=m0+m1+m2 (4)

[0049] Among them, m0 is the static mass excluding the mass flow of the reciprocating pump and the mass of the damping particles; m1 is the apparent mass of the mass flow of the reciprocating pump; m2 is the apparent mass of the damping particles; the apparent mass of the vibration absorption system usually refers to the equivalent mass of the vibration absorption system under specific conditions;

[0050] The initial natural frequency f0 of the vibration-absorbing equipment is expressed by formula (5):

[0051]

[0052] When f1=f j When X0=0, X1 reaches the maximum value, producing the maximum vibration absorption effect;

[0053] The apparent mass of the vibration absorption system can also be expressed by formula (6):

[0054]

[0055] Among them, m 1静 is the mass flow rate of the reciprocating pump, m 2静 is the mass of the damping particles, is the acceleration of the working fluid in the reciprocating pump, is the average acceleration of the damping particles;

[0056] It can be seen from formula (6) that the apparent mass of the vibration absorption system is obtained by superimposing the product of the equivalent acceleration and mass of a single damping particle mass unit and a single working fluid unit;

[0057] It should be noted that the natural frequency of the vibration absorption system without damping refers to the frequency of the system's free vibration without external excitation; the natural frequency f1 of the vibration absorption system without damping is equal to the excitation force frequency f of the vibration absorption equipment to be absorbed. j When the reciprocating pump mass flow rate (working fluid mass flow rate) and the static mass of the damping particles are unchanged, the larger the apparent mass of the reciprocating pump mass flow rate and the apparent mass of the damping particles, and the smaller the reciprocating pump mass flow rate and the static mass of the damping particles are when the corresponding apparent masses are the same.

[0058] In some vibration absorption systems, especially those involving rotation or reciprocating motion, the working fluid or damping particles can generate virtual mass; virtual mass is the difference between the apparent mass and the static mass of a moving object. It is due to the inertial effect of rotation or reciprocating motion. It can increase the total inertia of the system, thereby affecting the dynamic response of the system; therefore, the virtual mass can be used to adjust the natural frequency of the vibration absorption system to achieve the purpose of vibration absorption; in the vibration absorption system, the actual mass on the spring refers to the mass directly connected to the spring, that is, the static mass excluding the mass flow of the reciprocating pump and the mass of the damping particles, which directly affects the stiffness and natural frequency of the vibration absorption system; the smaller the actual mass, the higher the natural frequency of the system; the static mass of the vibration absorption system refers to the total mass of the vibration absorption system when there is no motion; when designing a vibration absorption system, it is usually hoped to reduce the static mass to reduce the inertia of the system, improve the response speed and vibration absorption efficiency; when the natural frequency of the vibration absorption system matches the frequency of the excitation force, and the virtual mass of the system is large, the system can absorb vibration energy more effectively. This is because the virtual mass increases the inertia of the system, causing the system to produce greater acceleration under the action of the excitation force, thereby generating greater damping force. At the same time, if the actual mass on the spring is smaller, the stiffness of the system will be reduced, which helps improve the vibration absorption ability of the system.

[0059] When the pump housing 51 of the reciprocating pump 5 vibrates downward, the pump rod 17 drives the valve disc 6 to move upward, increasing the internal space of the pump housing 51 and sucking the working fluid 21 in the impeller housing 71; this process follows the law of conservation of momentum, because the flow of the liquid is caused by the pressure change inside the pump housing 51. Subsequently, when the pump housing 51 moves upward, the pump rod 17 drives the valve disc 6 to move downward, compressing the internal working fluid 21 and increasing the kinetic energy of the liquid. This process also follows the law of conservation of kinetic energy; according to the law of conservation of energy, in an ideal situation without external energy loss (such as friction loss, heat loss, etc.), the total energy of a closed system should remain unchanged; assuming that the vibration absorption system of the present invention does not take into account mechanical losses, and because the speed after impact is close to 0, the kinetic energy of the fluid impact, i.e., the sum of the kinetic energy of the fluid ejected from the nozzle and the kinetic energy of the damping particles rotating and the collision energy between the damping particles is equal, so:

[0060]

[0061] Among them, m 1静 is the mass flow rate of the reciprocating pump, v1 is the nozzle injection speed, m 2静 is the mass of the damping particles, is the average velocity of the damping particles, Q 碰 is the energy of the collision between damping particles.

[0062] like Figure 3 As shown, the second aspect of the present invention provides a design method of an inertial particle damping dynamic vibration absorption system based on a reciprocating pump, comprising the following steps:

[0063] S1: Calculate the required stiffness of the vibration absorbing system according to the total static mass and initial static displacement of the vibration absorbing system allowed;

[0064] S2: Calculating the apparent mass of the vibration absorbing system according to the stiffness required by the vibration absorbing system and the excitation force frequency of the vibration absorbing device to be absorbed;

[0065] S3: Select the specifications and models of the existing tangential throttling nozzle and the mass flow rate of the reciprocating pump, and calculate the nozzle injection speed according to the caliber of the tangential throttling nozzle on the vibration absorption system;

[0066] S4: Based on the fact that the kinetic energy of the fluid ejected from the nozzle is equal to the kinetic energy and momentum of the damping particles rotating during the working process of the reciprocating pump 5, the driving impeller unit 7, and the particle damping inertia stirring unit 8, multiple combinations of damping particle mass, damping particle diameter, and filling rate are calculated by simulation means;

[0067] S5: Determine whether the total static mass of the vibration absorption system is greater than the mass of the damping particles, the mass flow of the reciprocating pump, and the sum of the static mass excluding the mass flow of the reciprocating pump and the mass of the damping particles; if so, the selection of the tangential throttling nozzle is completed, otherwise repeat steps S3 to S5, and reselect the flow of the reciprocating pump or the model of the tangential throttling nozzle until the requirements are met.

[0068] Furthermore, in step S1, the total static mass mg and initial static displacement X of the vibration absorption system are allowed to be st is a known parameter; the stiffness required by the vibration absorption system is calculated by Hooke's law; as shown in formula (8):

[0069]

[0070] Further, in step S2, the excitation force frequency of the vibration force device to be absorbed is obtained by testing or numerical simulation; when calculating the apparent mass M1 of the vibration absorption system, let: the initial natural frequency f0 of the vibration force device to be absorbed and the excitation force frequency f j equal;

[0071] Furthermore, in step S3, the nozzle spray speed v1 is the spray speed of the working liquid 21; in step S4, according to formula (6), the momentum of the fluid sprayed from the nozzle during the operation of the reciprocating pump 5, the driving impeller unit 7, and the particle damping inertia stirring unit 8 is equal to the momentum of the damping particle rotation, which is expressed by the following formula:

[0072]

[0073] During the operation of the reciprocating pump 5, the driving impeller unit 7, and the particle damping inertia stirring unit 8, the kinetic energy of the fluid ejected from the nozzle is equal to the kinetic energy of the damping particle rotation, which is expressed by formula (7). According to formulas (6), (7), and (9), simulation is performed to solve the combination of multiple damping particle masses, damping particle diameters, and filling rates.

[0074] The present invention uses high-speed stirring particle damping to increase the number of collisions between particles per unit time, thereby increasing the consumption of vibration absorption energy and producing a higher vibration absorption effect; the present invention takes into account the efficiency of energy conversion and thermal management, and optimizes the temperature and pressure of the liquid through the design of the cooler and the throttling nozzle to ensure that the system operates in an efficient state; at the same time, an effective energy dissipation mechanism is provided through the introduction of damping particles, so that the system can adapt to different vibration environments and requirements. This inertial particle damping dynamic vibration absorption system based on a reciprocating pump has potential use value in industrial applications, especially in situations where precise vibration control is required.

[0075] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A dynamic vibration absorption system based on an inertial particle damping of a reciprocating pump, characterized in that: It comprises a spring (1), a reciprocating pump (5) connected to the spring (1), a driving impeller unit (7) arranged at the top of the reciprocating pump (5), and a particle damping inertial stirring unit (8) arranged at the top of the driving impeller unit (7); wherein: The reciprocating pump (5) comprises a pump housing (51), a pump rod (17) arranged inside the pump housing (51), and a valve flap (6); one end of the spring (1) is fixed to the vibration force device to be absorbed, and the other end is connected to the bottom of the pump housing (51); one end of the pump rod (17) is inserted into the interior of the spring (1) and fixed to the vibration force device to be absorbed, and the other end extends from the bottom center of the pump housing (51) into the interior of the pump housing (51); The driving impeller unit (7) comprises an impeller shell (71) arranged at the top of the pump shell (51) and a driving impeller (14) arranged inside the impeller shell (71); the particle damping inertial volume stirring unit (8) comprises an inertial volume shell (81) arranged at the top of the impeller shell (71), damping particles (9) and a stirring impeller (13) arranged inside the inertial volume shell (81); the driving impeller (14) and the stirring impeller (13) rotate coaxially and in the same direction through an impeller rod (12) arranged at the center to form a series inertial volume; A liquid inlet pipe (19) is provided between the bottom of one side of the pump housing (51) and the side of the impeller housing (71); a liquid discharge pipe (4) is provided between the bottom of the other side of the pump housing (51) and the bottom of the impeller housing (71); The working fluid (21) is pressurized by a reciprocating pump (5) to drive the driving impeller (14) to rotate. The rotating driving impeller (14) drives the coaxial stirring impeller (13) to stir the damping particles (9), so that the damping particles (9) rotate, thereby realizing the rotational movement of the damping particles (9) in addition to the up and down movement of the reciprocating pump (5), thereby increasing the vibration absorption effect.

2. According to claim 1, a reciprocating pump-based inertial particle damping dynamic vibration absorption system is characterized in that: An upper bearing (11) is provided at the top center of the inertia casing (81); A lower bearing (16) is provided at the top center of the pump housing (51); One end of the impeller rod (12) is connected to the lower bearing (16), the middle passes through the top center of the impeller shell (71), and the other end is connected to the upper bearing (11).

3. The inertial particle damping dynamic vibration absorption system based on a reciprocating pump according to claim 1 is characterized in that: A dynamic seal (2) is provided at the connection between the pump rod (17) and the pump housing (51); A rotating dynamic seal (10) is provided at the connection between the impeller rod (12) and the impeller shell (71).

4. A reciprocating pump-based inertial particle damping dynamic vibration absorption system according to any one of claims 1 to 3, characterized in that: An outlet one-way valve (20) is provided at the junction of the liquid inlet pipe (19) and the pump housing (51); and a one-way inlet valve (3) is provided at the junction of the liquid discharge pipe (4) and the pump housing (51).

5. A reciprocating pump-based inertial particle damping dynamic vibration absorption system according to any one of claims 1 to 3, characterized in that: A tangential throttling nozzle (15) is provided at the junction of the impeller housing (71) and the liquid inlet pipe (19) for spraying the working liquid (21) in the pump housing (51) onto the driving impeller (14).

6. A reciprocating pump-based inertial particle damping dynamic vibration absorption system according to any one of claims 1 to 3, characterized in that: The liquid inlet pipe (19) is connected to a cooler (18).

7. A reciprocating pump-based inertial particle damping dynamic vibration absorption system according to any one of claims 1 to 3, characterized in that: The impeller housing (71) and the inertia casing (81), and the impeller housing (71) and the pump housing (51) are all fixed and sealed to ensure that the working fluid (21) circulates inside and prevent fluid leakage.

8. A reciprocating pump-based inertial particle damping dynamic vibration absorption system according to any one of claims 1 to 3, characterized in that: The particle size of the damping particles (9) is 0.5 to 10 mm, and the space filling rate is 20% to 95%; the damping particles (9) are spherical particles, elliptical particles or irregularly shaped particles.

9. A reciprocating pump-based inertial particle damping dynamic vibration absorption system according to any one of claims 1 to 3, characterized in that: The material of the damping particles (9) is stainless steel particles, iron particles, ceramic particles, copper particles, or tungsten carbide particles.

10. A design method for a reciprocating pump-based inertial particle damping dynamic vibration absorption system, characterized in that: The method is implemented by using the inertial particle damping dynamic vibration absorption system based on a reciprocating pump as described in any one of claims 1 to 9, comprising the following steps: S1: Calculate the required stiffness of the vibration absorbing system according to the total static mass and initial static displacement of the vibration absorbing system allowed; S2: Calculating the apparent mass of the vibration absorbing system according to the stiffness required by the vibration absorbing system and the excitation force frequency of the vibration absorbing device to be absorbed; S3: Select the specifications and models of the existing tangential throttling nozzle and the mass flow rate of the reciprocating pump, and calculate the nozzle injection speed according to the caliber of the tangential throttling nozzle on the vibration absorption system; S4: Based on the fact that the kinetic energy of the fluid ejected from the nozzle is equal to the kinetic energy and momentum of the damping particles rotating during the working process of the reciprocating pump, the driving impeller unit, and the particle damping inertia stirring unit, multiple combinations of damping particle mass, damping particle diameter, and filling rate are calculated by simulation; S5: Determine whether the total static mass of the vibration absorption system is greater than the mass of the damping particles, the mass flow of the reciprocating pump, and the sum of the static mass excluding the mass flow of the reciprocating pump and the mass of the damping particles; if so, the selection of the tangential throttling nozzle is completed, otherwise repeat steps S3 to S5, and reselect the flow of the reciprocating pump or the model of the tangential throttling nozzle until the requirements are met.

Images