A structure, design method, device and storage medium for eliminating vibration and whistling of fluid proportional valve

Abstract

The present invention discloses a structure, design method, device and storage medium for eliminating vibration and whistling of a fluid proportional valve. The present invention introduces a damping force when the valve core oscillates by setting a conductive loop structure inside the fluid proportional valve, thereby eliminating the oscillation of the fluid proportional valve. By analyzing the force of the valve core movement, the dynamic equation of the valve core is established, and by solving the second-order non-homogeneous ordinary differential equation, when the characteristic equation has a real number solution, the valve core oscillation system will not oscillate; when the characteristic equation does not have a real number solution, the design guidance method is used to adjust the relevant parameters so that the system does not oscillate, thereby realizing the optimal design of vibration elimination.

Description

Technical Field

[0001] The invention belongs to the technical field of valve bodies, and relates to a structure, a design method, a device and a storage medium for eliminating vibration and whistling of a fluid proportional valve. Background Art

[0002] Fluid proportional control valves can achieve rapid and continuous regulation of flow and pressure, and can realize remote control and automated control of industrial processes. Due to its obvious advantages, proportional valves have been widely used in industrial automation, aerospace, medical health and other industries.

[0003] However, in the actual use of fluid proportional valves, due to vortex vibration, aerodynamic force and other factors, when the external disturbance is close to the natural frequency of the valve core, vibration and howling often occur, which changes the performance of the fluid proportional valve, reduces the system performance, and even causes spring breakage and system out of control. If this vibration is not eliminated, the product life will be reduced and the product performance will be affected.

[0004] Conventional vibration elimination methods include increasing spring stiffness, reducing fitting clearance, etc. Increasing spring stiffness can increase the natural frequency of the system itself and improve the pressure difference working range of the fluid proportional valve, but it cannot fundamentally solve the vibration howling problem; reducing the fitting clearance can eliminate vibration by increasing the friction damping effect of the system, but it will increase the hysteresis of the fluid proportional valve. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a structure, a design method, a device and a storage medium for eliminating vibration and whistling of a fluid proportional valve.

[0006] The first aspect of the present invention provides a structure for eliminating vibration and whistling of a fluid proportional valve. A conductive circuit structure is arranged inside the fluid proportional valve. The conductive circuit structure generates eddy current damping force when the valve core oscillates, thereby converting the mechanical energy of the vibration into heat energy and dissipating it.

[0007] Preferably, the conductive circuit is installed inside the coil frame of the fluid proportional valve and is integrally formed during the injection molding of the coil frame.

[0008] Preferably, the conductive loop structure is an enameled wire, a copper ring, an aluminum ring or other superconducting materials.

[0009] Preferably, the conductive loop is a multi-level conductive loop structure.

[0010] A second aspect of the present invention provides a design method for eliminating vibration and whistling of a fluid proportional valve, specifically:

[0011] S1: According to the valve core oscillation system to be matched with the vibration elimination design, the force analysis of the valve core oscillation system is carried out to establish the dynamic balance equation of the valve core movement;

[0012] S2: In the dynamic balance equation of the valve core movement, input the conductive circuit related structural parameters related to the generation of eddy current damping force; transform the dynamic balance equation into a second-order non-homogeneous ordinary differential equation, and obtain the corresponding characteristic equation;

[0013] S3: Solve the characteristic equation and determine whether the discriminant of the characteristic equation is greater than or equal to 0. If so, the design requirements are met and the valve core oscillation system will not produce vibration and howling; if not, readjust the relevant structural parameters of the conductive circuit until the vibration and howling are eliminated.

[0014] Preferably, the force analysis of the valve core oscillation system involves the combined effects of gravity, inertia force, eddy current force, friction force, spring force, electromagnetic force and air pressure.

[0015] Preferably, the conductive loop related structural parameters include the number of turns, resistance, length and quantity of the conductive loop.

[0016] Preferably, the second-order non-homogeneous ordinary differential equation is expressed as:

[0017]

[0018] Where m is the mass of the valve core system, x is the displacement of the valve core, t represents time, Q e is a constant, n is the number of turns of the conductive loop, N is the number of conductive loops, B is the magnetic induction intensity at the conductive loop, F m is the magnetomotive force generated by the excitation coil, L is the length of the conductive loop, R m (x) is the magnetic resistance of the valve core system due to the displacement of the valve core, R is the resistance of the conductive loop, k is the spring stiffness, F f F is the friction force on the valve core, e is the electromagnetic force, F gas is the air pressure and g is the acceleration due to gravity.

[0019] A third aspect of the present invention provides an electronic device, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the above-mentioned design method for eliminating vibration whistling of a fluid proportional valve when executing the program.

[0020] According to a fourth aspect of the present invention, a computer-readable storage medium is provided, wherein the storage medium stores a computer program for executing the above-mentioned design method for eliminating vibration and whistling of a fluid proportional valve.

[0021] The present invention has the following beneficial effects:

[0022] 1. The structure is simple. It only needs to add a conductive loop structure inside the coil frame without affecting other structures.

[0023] 2. Provide a design method for vibration elimination of fluid proportional valves, which has wide applicability.

[0024] 3. Improve the reliability and design accuracy of the fluid proportional valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the product of the embodiment of the present application.

[0026] Figure 2 This is a schematic diagram of the vortex generated when the valve core vibrates.

[0027] Figure 3 It is a schematic diagram of eddy currents generated inside a conductive loop.

[0028] Figure 4 It is the force analysis diagram of the valve core system.

[0029] Figure 5 It is a flow chart of the calculation method for valve core oscillation design.

[0030] Figure 6 It is a schematic diagram of the structure of an electronic device according to an embodiment of the present application. DETAILED DESCRIPTION

[0031] In order to make the objectives, technical solutions and advantages of the present disclosure more clearly understood, the present disclosure is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0032] The present invention provides an optimization guidance method for eliminating oscillation of a fluid proportional valve based on eddy current damping, specifically utilizing eddy currents generated by electromagnetic induction when a valve core vibrates to convert the mechanical energy of the vibration into internal energy for dissipation, thereby eliminating the vibration howling of the fluid proportional valve.

[0033] In the embodiments of the present disclosure, Figure 1 As shown, the conductive circuit 1 is installed inside the coil skeleton of the fluid proportional valve 3, and can be made of enameled wire, copper ring, aluminum ring or other superconducting materials, and can be a multi-stage conductive circuit structure. The more circuits there are, the more obvious the vibration elimination effect of eddy current damping is. In this embodiment, enameled wire is selected as the conductive circuit winding.

[0034] Furthermore, the conductive closed loop is installed inside the coil frame and is integrally formed during the injection molding of the coil frame, which will not affect the winding process.

[0035] In this embodiment, the coil is energized to generate a magnetic field, forming a closed magnetic induction loop. Under different currents, different electromagnetic forces are applied to the moving iron core, thereby controlling the opening of the moving iron core assembly to control the flow rate.

[0036] The working principle of this embodiment is described as follows:

[0037] like Figure 2 As a second-order spring oscillation system, the valve core system 2 has its own natural frequency. Due to the vortex shedding inside the fluid proportional valve and the influence of aerodynamic force, when the valve core spring oscillation system receives external disturbances and produces forced vibrations, and the valve core's natural frequency is the same as the excitation source frequency, resonance occurs at this time, the amplitude reaches the maximum, and the external manifestation is a sharp vibration whistling sound.

[0038] When the valve core vibrates up and down, the magnetic resistance of the closed magnetic circuit will change, which will cause the magnetic flux of the conductive circuit to change. According to the law of electromagnetic induction, induced electromotive force and eddy current will be generated in the closed conductive circuit, such as Figure 2 and Figure 3 The induced current will generate an induced magnetic field, which will hinder the oscillation of the moving iron core assembly and bring about a certain damping effect. The eddy current will heat the conductor and convert the mechanical energy of the vibration into heat energy and dissipate it.

[0039] The design parameters of the valve core system are as follows:

[0040]

[0041]

[0042] Based on the above valve core system design parameters, the embodiment of the present application provides a design method for eliminating vibration and whistling of a fluid proportional valve, specifically:

[0043] Step 1: According to the valve core oscillation system to be matched with the vibration elimination design, the force analysis of the valve core oscillation system is carried out to establish the dynamic equilibrium equation of the valve core movement.

[0044] According to the embodiment of the present disclosure, the valve core oscillation system is affected by gravity, inertia, eddy current, friction, spring force, electromagnetic force, and air pressure, and its oscillation condition is analyzed under the combined effect of these forces.

[0045] Going further, Figure 4 This is the force analysis diagram of the valve core system. Assume that the valve core oscillation system has a mass of m and an acceleration of g = 10 m / s 2 , the acceleration during movement is a, the spring stiffness is k, the displacement of the valve core oscillation system is x, and the friction force F on the valve core is f , electromagnetic force F e , gas pressure F gas , the eddy current force F generated by the conductive circuit on the valve core eddy .

[0046] According to the force analysis, the equilibrium equation is as follows:

[0047] ma+mg+F eddy +F f +kx=F e +F gas

[0048] Step 2: In the dynamic balance equation of the valve core movement, input the conductive circuit related structural parameters related to the generation of eddy current damping force, including the number of turns, resistance, length, and quantity information of the conductive circuit;

[0049] Assume that the resistance of the conductive loop is R, the number of turns is n, the number is N, the magnetic induction intensity at the conductive loop is B, the length of the conductive loop is L, the magnetic flux at the conductive loop is φ, the time is t, and the magnetomotive force F generated by the coil m The magnetic resistance of the valve core system due to the displacement of the valve core is R m (x), the induced electromotive force in the conductive circuit when the valve core oscillates is E, and the Ampere force on the conductive circuit is F A , there is the following derivation:

[0050] E = nΔφ / Δt = nφ′(t)

[0051]

[0052]

[0053]

[0054] When the valve core oscillates, the magnetic flux in the closed circuit changes, generating an induced electromotive force. The closed circuit is subjected to an Ampere force, and the eddy current generated in the closed circuit will further hinder the oscillation of the valve core. Here, the eddy current force F eddy It can be understood as F eddy =Q e F A , Q e For experience value.

[0055] The force balance equation of the valve core system can be simplified to a second-order non-homogeneous ordinary differential equation:

[0056]

[0057]

[0058] The characteristic equation is:

[0059]

[0060] Step 3: Solve the characteristic equation of the dynamic equation and determine whether the discriminant of the characteristic equation is greater than or equal to 0. If so, the design requirements are met and the valve core oscillation system will not produce periodic oscillations. If not, adjust the design parameters of the conductive circuit and return to S3.

[0061] is a particular solution of a second-order nonhomogeneous ordinary differential equation,

[0062] At this time, the characteristic equation discriminant

[0063] When the discriminant Δ>0, there are two different real roots r1 and r2, and the solution of the equation is:

[0064]

[0065] When the discriminant Δ=0, there is a repeated root r, and the solution of the equation is:

[0066] x=C1e rt +C2te rt +0.004

[0067] When the discriminant Δ<0, there are two complex roots, let The solution to the equation is:

[0068]

[0069] When the discriminant Δ≥0, the valve core oscillation system will not oscillate, and when the discriminant Δ<0, the valve core oscillation system will oscillate.

[0070] Therefore, in order to prevent the valve core oscillation system from generating periodic oscillations, when designing the conductive circuit, it is necessary to make Δ ≥ 0 as much as possible.

[0071] Step 4: The initial setting parameters of the conductive loop are as follows:

[0072] symbol meaning Numeric n Number of turns 200 turns N series Level 1 B Magnetic induction intensity at the conductive loop 1T L Conductive loop length 10m R Conductive loop resistance 10 ohm <![CDATA[F m ]]> Magnetomotive force 40A turns <![CDATA[R m ]]> Magnetic resistance <![CDATA[200H -1 ]]> <![CDATA[Q e ]]> Experience 0.2

[0073] R m (x) can be considered as a constant and substituted into the discriminant to obtain

[0074]

[0075] At this time, the valve core system may oscillate. As one of the preferred solutions, the conductive circuit level can be set to 2. At this time, the discriminant is greater than 0, and the valve core system will not produce periodic oscillations, meeting the design requirements.

[0076] like Figure 5The figure shows the design calculation flow chart of using eddy current damping to eliminate the vibration and whistling of the proportional valve. First, the dynamic equation of the valve core system is established, and the fluid proportional valve m, F are input. f , k, F e 、F gas , f parameter information, and then set the input conductive circuit n, N, B, L, R, F m , R m , Q e The relevant parameters of the parameter information are used to find out whether there is a real solution to the ordinary differential equation of the valve core oscillation motion. If there is a real solution to the ordinary differential equation, the valve core system will not oscillate. Otherwise, the relevant parameters need to be adjusted so that the valve core system will not oscillate, thereby achieving the optimal design of vibration elimination.

[0077] The present application also discloses an electronic device, such as Figure 6 As shown, it includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the above-mentioned design method for eliminating vibration and howling of a fluid proportional valve when executing the program.

[0078] The embodiment of the present application also discloses a computer-readable storage medium, wherein the storage medium stores a computer program, and the computer program is used to execute the above-mentioned design method for eliminating vibration and howling of a fluid proportional valve.

[0079] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory.

[0080] The non-volatile memory may include a read-only memory (ROM), a programmable ROM (PROM), an electrically programmable ROM (EPROM), an electrically erasable programmable ROM (EEPROM), or a flash memory. The volatile memory may include a random access memory (RAM) or an external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0081] The processor in the present application may include one or more processing cores. The processor calls the data stored in the memory by running or executing the instructions, programs, code sets or instruction sets stored in the memory, performs various functions of the present application and processes data. The processor can be at least one of an application-specific integrated circuit (ASIC), a digital signal processor (DSP), a digital signal processing device (DSPD), a programmable logic device (PLD), a field programmable gate array (FPGA), a central processing unit (CPU), a controller, a microcontroller and a microprocessor. It can be understood that for different devices, the electronic device used to realize the above-mentioned processor function can also be other, and the embodiments of the present application are not specifically limited.

[0082] Those skilled in the art can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example. In actual applications, the above-mentioned functions can be distributed and completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above.

[0083] The above are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

[0084] Finally, it should be noted that the above examples are only some specific embodiments of the present invention. Obviously, the present invention is not limited to the above examples, and there are many variations. All variations that can be directly derived or associated with the content disclosed by a person skilled in the art should be considered as the protection scope of the present invention.

Claims

1. A design method for eliminating vibration and whistling of a fluid proportional valve, wherein a conductive circuit structure is arranged inside the fluid proportional valve, and the conductive circuit structure generates eddy current damping force when the valve core oscillates, thereby converting the mechanical energy of the vibration into heat energy for dissipation, characterized in that: S1: According to the valve core oscillation system to be matched with the vibration elimination design, the force analysis of the valve core oscillation system is carried out to establish the dynamic balance equation of the valve core movement; S2: In the dynamic balance equation of the valve core movement, input the conductive circuit related structural parameters related to the generation of eddy current damping force; transform the dynamic balance equation into a second-order non-homogeneous ordinary differential equation, and obtain the corresponding characteristic equation, which is: Assume that the resistance of the conductive loop is R, the number of turns is n, the number is N, the magnetic induction intensity at the conductive loop is B, the length of the conductive loop is L, the magnetic flux at the conductive loop is φ, the time is t, and the magnetomotive force generated by the coil is F m The magnetic resistance of the valve core system due to the displacement of the valve core is R m (x), the induced electromotive force in the conductive circuit when the valve core oscillates is E, and the Ampere force on the conductive circuit is F A , there is the following derivation: E=n△φ / △t=nφ′(t) When the valve core vibrates up and down, the magnetic resistance of the closed magnetic circuit will change, which will cause the magnetic flux of the conductive circuit to change, generate an induced electromotive force, and the closed circuit will be subjected to the Ampere force. The eddy current generated in the closed circuit will further hinder the oscillation of the valve core. Here, the eddy current force F eddy =Q e F A , Q e is the experience value; S3: Solve the characteristic equation to determine whether the discriminant of the characteristic equation is greater than or equal to 0. If so, the design requirements are met and the valve core oscillation system will not produce periodic oscillations, i.e., vibration howling. If not, readjust the relevant structural parameters of the conductive circuit until the vibration howling is eliminated. The second-order non-homogeneous ordinary differential equation is expressed as: The discriminant of the characteristic equation is expressed as: Where m is the mass of the valve core system, x is the displacement of the valve core, t represents time, Q e is a constant, n is the number of turns of the conductive loop, N is the number of conductive loops, B is the magnetic induction intensity at the conductive loop, F m is the magnetomotive force generated by the excitation coil, L is the length of the conductive loop, R m (x) is the magnetic resistance of the valve core system due to the displacement of the valve core, R is the resistance of the conductive loop, k is the spring stiffness, F f F is the friction force on the valve core, e is the electromagnetic force, F gas is the air pressure, g is the acceleration due to gravity; The conductive loop related structural parameters include the number of turns, resistance, length and quantity of the conductive loop.

2. A design method for eliminating vibration and whistling of a fluid proportional valve according to claim 1, characterized in that: The force analysis of the valve core oscillation system involves the combined effects of gravity, inertia, eddy current, friction, spring force, electromagnetic force and air pressure.

3. According to claim 1, a design method for eliminating vibration and whistling of a fluid proportional valve is characterized by: The conductive loop is installed inside the coil frame of the fluid proportional valve and is integrally formed during the injection molding of the coil frame.

4. According to claim 3, a design method for eliminating vibration and whistling of a fluid proportional valve is characterized by: The conductive loop structure is an enameled wire, a copper ring or an aluminum ring.

5. A design method for eliminating vibration and whistling of a fluid proportional valve according to claim 3 or 4, characterized in that: The conductive loop is a multi-level conductive loop structure.

6. An electronic device, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, a design method for eliminating vibration and whistling of a fluid proportional valve as described in any one of claims 1 to 5 is implemented.

7. A computer-readable storage medium, characterized in that: The storage medium stores a computer program, and the computer program is used to execute a design method for eliminating vibration and whistling of a fluid proportional valve as described in any one of claims 1 to 5.

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