阅读说明：本技术 一种流体减压装置开孔度自动调节方法 (Automatic adjusting method for opening degree of fluid pressure reducing device ) 是由 李滔 李剑 张佳 李萍 李芳� 廖俊 于 2020-05-16 设计创作，主要内容包括：本发明提供一种流体减压装置的开孔度自动调节的方法,该流体减压装置,包括本体和扩散器,所述扩散器设置有流路,扩散器包括扩散盘,扩散盘的沉孔内设置有步进电机,步进电机的转轴上连接有转盘,所述转盘上均匀设置有半径逐渐变大的多个转盘通孔。通过BP神经网络控制器控制步进电机的转动,进而使得不同直径大小的转盘通孔与流路对齐,以实现流路开孔度的自动调节。该方案结构简单,适应性强且能实现智能化控制。(The invention provides a method for automatically adjusting the opening degree of a fluid pressure reducing device, which comprises a body and a diffuser, wherein the diffuser is provided with a flow path and comprises a diffusion disc, a stepping motor is arranged in a counter bore of the diffusion disc, a rotating shaft of the stepping motor is connected with a rotating disc, and a plurality of rotating disc through holes with gradually increased radius are uniformly arranged on the rotating disc. The BP neural network controller controls the rotation of the stepping motor, so that the turntable through holes with different diameters are aligned with the flow path, and the automatic adjustment of the opening degree of the flow path is realized. The scheme has the advantages of simple structure, strong adaptability and capability of realizing intelligent control.)

1. A method for automatically adjusting the opening degree of a fluid pressure reduction device, which is applied to the fluid pressure reduction device, and comprises the following steps: a body (4), said body (4) being internally hollow so as to define a fluid passage (6); the diffuser (5), the diffuser (5) is detachably mounted in the mounting area (2) of the body (4); the diffuser comprises a diffusion disc (3), a flow path (33) for reducing the pressure of fluid flowing through the fluid channel (6) is arranged on the diffusion disc (3), a stepping motor (53) is arranged in the diffusion disc (3), a rotating shaft of the stepping motor (53) is connected with a rotating disc (51), and 6 rotating disc through holes (511) with gradually-increased radius are uniformly arranged on the rotating disc (51); the central axis of each carousel throughbore (511) may coincide with the central axis of the flow passage (33) to effect alignment of one of the plurality of carousel throughbores (511) with the flow passage (33);

the adjusting method comprises the following steps:

(1) inputting fluid with density and flow rate, rotating the rotary disc (51) to enable the rotary disc through hole (511) with the diameter of the rotary disc (51) to be aligned with the flow path (33), collecting pressure intensities at the front end and the rear end of the diffusion disc (3) by using a sensor, and calculating to obtain the pressure intensities;

(2) repeating the step (1), inputting fluids with different densities and flow rates, aligning the through holes of the rotary discs with different diameters with the flow path, collecting the pressure at the two ends of the diffusion disc (3) by using a sensor, and calculating to obtain the pressure;

(3) training the BP neural network by using the data acquired in the step, wherein the data is used as input data of the BP neural network and output data of the BP neural network and is used as a group of training data to train the BP neural network;

(4) when the fluid pressure reducing device is used for reducing the pressure of fluid, the sensor automatically detects the density and the flow rate of the fluid, an expected pressure reduction value is input into the BP neural network controller (8), and after the BP neural network controller (8) calculates the output diameter, a pulse signal is sent to the stepping motor (53), so that the turntable through hole (511) matched with the output of the neural network is aligned with a flow path, and the automatic adjustment of the opening degree is realized.

2. The method for automatically adjusting the opening degree of a fluid pressure reduction device according to claim 1, wherein the distances from the centers of the plurality of the turntable through holes (511) to the center of the turntable (51) are equal, the diameter of the largest turntable through hole of the plurality of the turntable through holes (511) is equal to the diameter of the flow path (33), and the diameter of the smallest turntable through hole is larger than 0.

3. The method of claim 1, wherein a Levenberg-Marquardt algorithm is used to modify the connection weights of the BP neural network.

Technical Field

The invention belongs to a control method of a fluid pressure reducing device, and particularly relates to a method for automatically adjusting the opening degree of the fluid pressure reducing device.

Background

In process control systems, it is often necessary to reduce the pressure of the fluid. In some cases, the pressure of the fluid must be reduced significantly. In the case where a relatively high pressure drop is required, the ratio of the pressure drop resulting from dividing the pressure change by the input pressure may be quite high. Currently, flow restriction devices, such as diffusers, are commonly used to increase the flow rate of a fluid after it has passed through the fluid restriction device. From bernoulli's equation, as the fluid flow rate increases, the pressure decreases accordingly. However, the degree of opening of current fluid restriction devices cannot be adjusted.

Disclosure of Invention

The invention aims to provide a method for automatically adjusting the opening degree of a fluid pressure reduction device, which realizes automatic adjustment by utilizing the opening degree of a BP neural network on the fluid limiting device and has the advantages of simple adjustment, strong adaptability, intelligent control and the like.

In order to achieve the purpose, the invention adopts the technical scheme that: 1. a method of automatically adjusting a degree of openness of a fluid pressure reduction device, the fluid pressure reduction device comprising: the interior of the body is hollow so as to define a fluid channel; a diffuser removably mounted within the mounting region of the body; the diffuser comprises a diffusion disc, a flow path for reducing the pressure of fluid flowing through the fluid channel is arranged on the diffusion disc, a stepping motor is arranged in the diffusion disc, a rotating shaft of the stepping motor is connected with a rotating disc, and 6 rotating disc through holes with gradually-increased radiuses are uniformly arranged on the rotating disc; the central axis of each carousel throughbore may coincide with the central axis of the flow passage to effect alignment of one of the plurality of carousel throughbores with the flow passage; the adjusting method comprises the following steps:

(1) inputting fluid with density and flow rate, rotating the turntable to align the turntable through hole with the diameter to the flow path, collecting the pressure of the front and back ends of the diffusion disc with the sensor and calculating;

(2) repeating the step (1), inputting fluids with different densities and flow rates, aligning the through holes of the rotary discs with different diameters with the flow path, collecting the pressure at the two ends of the diffusion disc by using a sensor, and calculating to obtain the pressure;

(3) training the BP neural network by using the data acquired in the step, wherein the data is used as input data of the BP neural network and output data of the BP neural network and is used as a group of training data to train the BP neural network;

(4) when the fluid pressure reducing device is used for reducing the pressure of fluid, the sensor automatically detects the density and the flow rate of the fluid, an expected pressure reduction value is input into the BP neural network controller, and after the BP neural network controller calculates the output diameter, a pulse signal is sent to the stepping motor, so that the through hole of the turntable matched with the output of the neural network is aligned with the flow path, and the automatic adjustment of the opening degree is realized.

Furthermore, the distances from the circle centers of the plurality of turntable through holes to the circle center of the turntable are equal, the diameter of the largest turntable through hole in the plurality of turntable through holes is equal to the diameter of the flow path, and the diameter of the smallest turntable through hole is larger than 0.

Furthermore, a Levenberg-Marquardt algorithm is adopted to correct the connection weight of the BP neural network.

The invention has the advantages and positive effects that: the BP neural network is adopted to realize the intelligent control of the hole opening degree of the diffuser, and the method has the advantages of high control precision, strong adaptability, high intelligence and the like.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1;

fig. 3 is a cross-sectional view of the diffusion disc 3;

fig. 4 is a left side view of the diffusion disc 3;

fig. 5 is a front sectional view of the turntable 51;

fig. 6 is a left sectional view of the dial 51.

Detailed Description

The following description of the embodiments of the present invention, with reference to the accompanying drawings, will be made in detail with reference to the accompanying drawings, wherein the embodiments of the present invention are described in detail with reference to the following description of the embodiments, such as the shapes and structures of the respective members, the mutual positions and connection relationships between the respective portions, and the operation and working principles of the respective portions.

As shown in fig. 1 to 6, a method for automatically adjusting the opening degree of a fluid pressure reduction device includes an opening degree adjustable fluid pressure reduction device adapted to be disposed between a first pipe 1 and a second pipe 7, the fluid pressure reduction device including: a body 4, said body 4 being internally hollow so as to define a fluid passage 6; a diffuser 5, said diffuser 5 being removably mounted in the mounting area 2 of said body 4; the diffuser is provided with a flow path 33 for reducing the pressure of the fluid flowing through the fluid channel 6. The diffuser 5 comprises a diffusion disc 3, a counter bore 32 and a flow path 33 in the form of a through hole are arranged along the axial direction of the diffusion disc 3, an installation groove 31 is also arranged along the radial direction of the diffusion disc 3, wherein the counter bore 32 and the flow path 33 are communicated with the installation groove 31; a stepping motor 53 is arranged in the counter bore 32, a rotating shaft of the stepping motor 53 is connected with a rotating disc 51, the rotating disc 51 is arranged in the mounting groove 31, and 6 rotating disc through holes 511 with gradually-increased radiuses are uniformly arranged on the rotating disc 51; wherein the central axis of each of the turntable through holes 511 may coincide with the central axis of the flow path 33; a sealing end cover 52 is arranged outside the counter bore 32 to prevent the fluid from contacting the stepping motor 53 through the counter bore 32; a sealing ring 54 is further arranged in the mounting groove 31, the inner diameter of the sealing ring 54 is larger than or equal to the diameter of the flow path 33, the central axis of the sealing ring 54 is overlapped with the central axis of the flow path 33, one surface of the sealing ring 54 is attached to the rotary disc 51, and therefore fluid is prevented from entering the counter bore 32 through the flow path 33 and the mounting groove 31 and contacting the stepping motor 53; the stepping motor 53 is connected with the controller 8 through a lead 9, and the controller 8 controls the rotation angle of the stepping motor 53, so that the central axis of the turntable through hole 511 with different diameters is overlapped with the central axis of the flow path 33, and the opening degree of the flow path 33 is adjusted. The distances from the circle centers of the plurality of turntable through holes 511 to the circle center of the turntable (51) are equal, the diameter of the largest turntable through hole in the plurality of turntable through holes 511 is equal to the diameter of the flow path 33, and the diameter of the smallest turntable through hole is larger than 0.

Wherein, adopt the following steps to adjust the fluid pressure reduction device:

(1) inputting fluid with density and flow rate, rotating the rotary disc 51 to make the rotary disc through hole 511 with the diameter of the rotary disc 51 aligned with the flow path 33, collecting the pressure at the front end and the rear end of the diffusion disc 3 by using a sensor, and calculating to obtain the pressure;

(2) repeating the step (1), inputting fluids with different densities and flow rates, aligning the through holes of the rotary discs with different diameters with the flow path, collecting the pressure at the two ends of the diffusion disc 3 by using a sensor, and calculating to obtain the pressure;

(3) training the BP neural network by using the data acquired in the steps, taking the data as input data of the BP neural network and output data of the BP neural network as a group of training data to train the BP neural network, and correcting the connection weight of the BP neural network by adopting a Levenberg-Marquardt algorithm;

(4) when the fluid pressure reducing device is used for reducing the pressure of fluid, the sensor automatically detects the density and the flow rate of the fluid, an expected pressure reduction value is input into the BP neural network controller 8, and after the BP neural network controller 8 calculates the output diameter, a pulse signal is sent to the stepping motor 53, so that the turntable through hole 511 matched with the output of the neural network is aligned with a flow path, and the automatic adjustment of the opening degree is realized.