A valve resistance adaptive control optimization method and system based on flow change

Abstract

The application discloses a valve resistance self-adaptive control optimization method based on flow change, wherein a flow speed detector is arranged at the bottom end of a downward bending pipe section to detect the flow speed of fluid on the pipe; the fluid is discharged from a horizontal branch pipe connected with one side of the outlet of the bending pipe section, and the flow speed of the fluid is recorded after the fluid is discharged from the horizontal branch pipe; the outlet end of the bending pipe section is connected with a horizontal water outlet pipe section, and the water outlet pipe section is located above the horizontal branch pipe; when the fluid is discharged from the horizontal branch pipe, the horizontal branch pipe is immediately closed to make the fluid flow into the water outlet pipe section; a resistance regulator is further connected to the horizontal water outlet pipe section, and the resistance regulator is controlled by a controller; when the flow speed increases, the resistance regulator reduces the resistance to the fluid flowing therethrough, and the flow speed increases to increase the resistance. The application can simply and effectively realize the regulation of the fluid resistance at the valve.

Description

Technical Field

[0001] This invention relates to the field of fluid transport technology, and more specifically to a valve resistance adaptive control optimization method and system based on flow rate variation. Background Technology

[0002] When the main components of a pipeline system, such as pipes and valves, remain constant, the resistance curve within the pipe is a parabola based on changes in flow rate. This means that resistance increases rapidly with increasing flow rate. Therefore, in actual transport processes, the resistance at valves changes dramatically; the higher the flow velocity, the more significantly the resistance at the valve increases. A direct problem arising from this is the unpredictability or uncontrollability of fluid transport time and efficiency. For example, if the flow velocity is y and the transport time for a given fluid is t, then when it is necessary to increase the flow velocity to ny to accelerate transport efficiency, the subjectively required time is approximately t / n. However, in reality, because higher flow velocities result in greater resistance, the actual time taken is often much greater than t / n, making it difficult to predict the efficiency of distribution control. Summary of the Invention

[0003] The problem to be solved by the present invention is to provide a valve resistance adaptive control optimization method and system based on flow rate change to address the above-mentioned shortcomings of the prior art. This solves the problem that in the prior art, it is difficult to intuitively and flexibly control the fluid distribution efficiency at the valve and cannot control the increase in resistance caused by the increase in flow rate.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a valve resistance adaptive control optimization method based on flow rate variation, comprising the following steps:

[0005] A flow rate detector is installed on the pipe at the inlet end of the valve. The flow rate detector detects the fluid flow rate on the pipe. The flow rate detector is installed at the bottom end of a downward-curving pipe section. As the fluid begins to enter the pipe section, it is first discharged from a horizontal branch pipe connected to the outlet side of the pipe section. The flow rate of the fluid is only recorded after fluid is discharged from the horizontal branch pipe.

[0006] The outlet end of the bend is connected to a horizontal water outlet pipe section, which is located above the horizontal branch pipe. When fluid is released from the horizontal branch pipe, the horizontal branch pipe is immediately closed, allowing the fluid to flow into the water outlet pipe section.

[0007] A resistance regulator is also connected to the horizontal outlet pipe section. The resistance regulator is controlled by a controller and can adjust the resistance to fluid flow in the outlet pipe section according to the detection value of the flow velocity detector. The outlet of the resistance regulator is connected to a valve that needs to be controlled. If the flow velocity increases, the resistance regulator reduces the resistance to the fluid flowing through it; if the flow velocity decreases, it increases the resistance to the fluid flowing through it.

[0008] Specifically, the flow velocity detector used in this invention can be a flow velocity sensor. Alternatively, it can be detected by calculation. For example, the principle of the flow velocity detector is to first measure the flow rate k within a time period t, and the flow velocity v = k / t.

[0009] When the diameter of the pipe hole in the bend is less than 50mm, t is 15-18 seconds; when the diameter of the pipe hole in the bend is greater than 50mm but less than 100mm, t is 12-14 seconds; when the diameter of the pipe hole in the bend is greater than 100mm but less than 200mm, t is 9-12 seconds; and when the diameter of the pipe hole in the bend is greater than 200mm but not exceeding 350mm, t is 3-6 seconds.

[0010] The resistance regulator used adjusts resistance by changing the shape of its own flow path. When resistance needs to be increased, the curvature of the flow path increases, and when resistance needs to be decreased, the curvature of the flow path decreases. The flow path is the only path for the water to flow into the valve.

[0011] The flow path is wavy, and when the flow path changes, its cross-section does not change, or the rate of change does not exceed 5%.

[0012] Meanwhile, based on the above method, the present invention also proposes a valve resistance adaptive control system based on flow rate change, including a flow velocity detector, a bend section, a horizontal branch pipe, a controller, and a resistance regulator. The bend section is U-shaped, with both ends bent and extending horizontally. The flow velocity detector is installed at the bottom center of the bend section. The controller is connected to a drive element, which controls the movement of the resistance regulator.

[0013] The resistance regulator includes a double-threaded pipe, a housing, and an elastic flow channel component. The two ends of the double-threaded pipe are respectively threaded and sealed to a pipe connected to a bend section and to the housing. The elastic flow channel component is axially installed inside the housing. The elastic flow channel component is elastic and hollow inside, and its sidewall has an axially penetrating annular cross-section flow channel. The middle part of the flow channel bulges outward and bends into an arch shape, forming a flow path for fluid to flow through. After the end of the double-threaded pipe is screwed into the end of the housing, it can squeeze the end of the elastic flow channel component and make the bulge of its flow channel further arch.

[0014] The driving element includes a motor, which drives the gear fixedly sleeved on the outside of the double-threaded tube to rotate. The motor is connected to the controller.

[0015] The resistance regulator includes an S-shaped pipe section connected between the bend and the valve. An arc-shaped telescopic pipe is slidably fitted at the outlet end of the S-shaped pipe. The outlet end of the arc-shaped telescopic pipe extends into a groove connected to the valve inlet to supply fluid into the groove. The arc-shaped telescopic pipe is extended and retracted by a hydraulic rod connected to the controller.

[0016] Based on the above structure, the flow rate detector in this invention includes a flow meter, which includes several plates arranged in a ring array on the side wall of the rotating shaft. The flow meter is installed in a cylindrical receiving cavity at the bottom of the bend section. The rotating shaft is located in the center of the receiving cavity. A code disk is fixed to the top of the rotating shaft. A ring of magnetic poles is embedded in the code disk. A magnetic sensor is provided above the edge of the code disk. When the magnetic sensor is aligned with the magnetic pole, a count is performed.

[0017] Compared with the prior art, the present invention has the following beneficial effects: The present invention can flexibly adjust the resistance of fluid flowing through the valve when the flow rate changes significantly, and integrate it with the valve, which greatly reduces the adverse effects of the resistance increasing rapidly with the increase of flow rate. With the main components unchanged, the resistance can be kept relatively stable or changed slowly through automatic adjustment. Adaptive optimization control can improve the efficiency of the entire conveying and distribution system, and the conveying control rhythm can be initially estimated and controlled. Attached Figure Description

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

[0019] Figure 1 This is a schematic diagram illustrating the principle of the method described in this invention;

[0020] Figure 2 It is a diagram of a fluid path adjustment structure;

[0021] Figure 3 This is another adjustment structure diagram for the fluid path;

[0022] Figure 4 This is a cross-sectional view of the flow velocity detector at the bottom of the bend in the pipe section;

[0023] Figure 5This is a top view of the structure connecting the page plate and the pivot.

[0024] The reference numerals in the attached drawings are explained as follows: Valve 1, Bend Section 2, Flow Rate Detector 3, Resistance Regulator 4, Elastic Flow Channel Component 5, Raised Section 501, Double-Threaded Pipe 6, Gear 601, Arc-Shaped Telescopic Pipe 7, Tank 8, Rotating Shaft 9, Leaf Plate 10, Encoder 11, Magnetic Sensor 12, Housing 13, Flow Path 14, Hydraulic Rod 15, Horizontal Branch Pipe 16. Detailed Implementation

[0025] To make the technical means, creative features, achieved objectives, and functions of this invention clearer and easier to understand, the technical solution of this invention will be described in detail below. Those skilled in the art should understand that the embodiments described below are merely some specific implementation structures or methods of this invention, and not all embodiments; therefore, the scope of protection of this invention is not limited thereto.

[0026] See Figures 1-3 As shown, this embodiment discloses a valve resistance adaptive control optimization method based on flow rate changes. When performing regulation control, as follows... Figure 1 Specifically, a flow velocity detector 3 is installed on the pipe at the inlet end of valve 1 to detect the fluid velocity in the pipe. In this embodiment, the flow velocity detector 3 is installed at the bottom end of a downward-curving pipe section 2. As the fluid begins to enter the pipe section 2, it is first discharged from a horizontal branch pipe 16 connected to the outlet side of the pipe section 2. The fluid velocity is only recorded after fluid is discharged from the horizontal branch pipe 16. This ensures that the fluid flowing through the pipe section 2 fills the entire pipe, without any partial or insufficient flow. The collected flow velocity can more accurately correspond to the actual fluid flow, thereby allowing for the adjustment of the specific resistance.

[0027] like Figure 1 In this control optimization method, the outlet end of the bend section 2 is connected to a horizontal water outlet pipe section, which is located above the horizontal branch pipe 16. When fluid is released from the horizontal branch pipe 16, the horizontal branch pipe 16 is immediately closed, allowing the fluid to flow into the water outlet pipe section. That is, at the beginning, the flow rate error represented by the rotation of the flow rate detector 3 when the pipe is not full of fluid is avoided. The fluid is discharged from the horizontal branch pipe 16 in advance, thus filling the bend section 2. After the bend section 2 is filled, the fluid is output to the pipeline where valve 1 is located. Of course, it goes without saying that those skilled in the art should know that in order to fill the entire pipe hole in the pipeline where valve 1 is located, the corresponding pipe hole diameter should be smaller than the hole diameter of the bend section 2, and at least not larger than the hole diameter of the bend section 2.

[0028] In specific operation, a resistance regulator 4 is also connected to the outlet pipe section. The resistance regulator 4 is controlled by a controller and can adjust the resistance to fluid flow in the outlet pipe section according to the detection value of the flow rate detector 3. The outlet of the resistance regulator 4 is connected to the valve 1 that needs to be controlled. If the flow rate increases, the resistance regulator 4 reduces the resistance to the fluid flowing through it. If the flow rate decreases, it increases the resistance to the fluid flowing through it. This makes the amount of fluid passing through the valve 1 as consistent as possible with the flow rate. For example, if the flow rate is 20 cubic meters per hour and it takes 20 minutes to fill the rated container, then when the flow rate is adjusted to 40 cubic meters per hour, the filling time should be maintained at about 10 minutes. In this way, the operator can easily grasp the filling progress and schedule from the filling time.

[0029] As a recommended operation of this optimized control method, the flow velocity detector 3 can be a flow velocity sensor to directly measure the corresponding flow velocity, thereby relating it to the fluid resistance at the control valve 1. For more intuitive data acquisition and verification, this method can also employ calculation-based detection. For example, the principle of the flow velocity detector 3 is to first measure the flow rate k within the time interval t, and then calculate the flow velocity v = k / t, thus obtaining the flow velocity magnitude and providing a reference for adjusting the resistance at valve 1.

[0030] Specifically, for example, when the diameter of the pipe hole in bend section 2 is less than 50mm, t is taken as 15-18 seconds; when the diameter of the pipe hole in bend section 2 is greater than 50mm but less than 100mm, t is taken as 12-14 seconds; when the diameter of the pipe hole in bend section 2 is greater than 100mm but less than 200mm, t is taken as 9-12 seconds; and when the diameter of the pipe hole in bend section 2 is greater than 200mm but does not exceed 350mm, t is taken as 3-6 seconds. In this way, a relatively accurate flow velocity value can be obtained in a short time.

[0031] As a specific implementation detail, the resistance regulator 4 used in this invention adjusts resistance by changing the form of its own flow path 14. When resistance needs to be increased, the curvature of the flow path 14 increases, thus increasing the resistance encountered by the fluid. Therefore, the resistance of the corresponding pipeline increases before entering valve 1. Conversely, when resistance needs to be reduced, the curvature of the flow path 14 decreases, making the path smoother and naturally lowering the resistance. At the same time, the key point is that this flow path 14 is the only path into valve 1, which allows it to directly affect the resistance of the fluid before it passes through valve 1.

[0032] As a preferred implementation method, the flow path 14 is wavy, and when the flow path changes, its cross-section does not change, or the rate of change does not exceed 5%, while the resistance changes significantly.

[0033] Finally, this embodiment also specifically introduces a valve resistance adaptive control system based on flow rate variation, such as... Figure 1It mainly includes a flow velocity detector 3, a bend section 2, a horizontal branch pipe 16, a controller, and a resistance regulator 4. The bend section 2 is U-shaped, with both ends bent and extending horizontally, and a rounded transition at the horizontal position. The flow velocity detector 3 is installed at the bottom center of the bend section 2. The controller is connected to a drive element, which controls the movement of the resistance regulator 4 to change the resistance.

[0034] Specifically, such as Figure 2 The resistance regulator 4 includes a double-threaded pipe 6, a housing 13, and an elastic flow channel component 5. The two ends of the double-threaded pipe 6 are respectively threaded and sealed to the pipe connected to the bend section 2 and the housing 13. The housing 13 is generally a columnar structure or a tubular structure. The elastic flow channel component 5 is axially installed inside the housing 13. The elastic flow channel component 5 is elastic and hollow inside. Its sidewall has an axially penetrating annular flow channel. The middle part of the flow channel is raised outward and curved into an arch shape, forming a flow path 14 for the fluid to flow through. Of course, in actual manufacturing, only the raised part 501 can be elastic, while the rest of the parts are rigid, so as to concentrate on changing the curvature of the flow channel at the raised part 501. It can be achieved that within a certain elastic deformation range, the curvature of the flow channel is large while the change in cross-section is very limited, which is temporarily ignored. When the end of the double-threaded tube 6 is screwed into the end of the outer casing 13, it can compress the end of the elastic flow channel component 5, causing the raised portion 501 of its flow channel to arch further, changing the curvature of the path and adjusting the resistance. The driving element can include a motor that drives the gear 601 fixedly sleeved on the outside of the double-threaded tube 6 to rotate, thereby rotating the double-threaded tube 6. Essentially, one end of the double-threaded tube 6 that contacts the elastic flow channel component 5 is an external pipe thread, while the other end can be a smooth cylindrical surface rotatably installed inside the corresponding pipe, without threads. The motor is connected to a controller, and the flow rate detector 3 transmits the flow rate signal to the controller, which then controls the motor accordingly, thereby adjusting the curvature of the flow path 14 of the elastic flow channel component 5.

[0035] like Figure 3 The resistance regulator 4 includes an S-shaped pipe section connected between the bend section 2 and the valve 1. An arc-shaped telescopic pipe 7 is slidably installed at the outlet end of the S-shaped pipe. The outlet end of the arc-shaped telescopic pipe 7 extends into a groove 8 connected to the inlet of the valve 1 to supply fluid into the groove 8. The arc-shaped telescopic pipe 7 is driven by a hydraulic rod 15 to extend and retract. The hydraulic rod 15 is connected to a controller, and the drive also pushes the arc-shaped telescopic pipe 7 to extend, changing the extension length of the arc-shaped telescopic pipe 7, which serves as the flow path 14, i.e., changing the curvature.

[0036] like Figures 4-5The flow rate detector 3 in this invention includes a flow meter, which comprises several blades 10 arranged in a circular array on the side wall of a rotating shaft 9. The flow meter is installed in a cylindrical receiving cavity at the bottom of the bent pipe section 2, with the rotating shaft 9 located in the center of the receiving cavity. Each rotation causes adjacent blades 10 to discharge a certain amount of fluid to the outlet side of the bent pipe section 2. A code disk 11 is fixed to the top of the rotating shaft 9, and a ring of magnetic poles is embedded in the code disk 11. A magnetic sensor 12 is provided above the edge of the code disk 11. When the magnetic sensor 12 is aligned with the magnetic poles, it performs a count. The number of counts represents the angle through which the blades 10 have rotated, and thus represents the volume of fluid discharged. It should be noted again that in this invention, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Therefore, those skilled in the art should know that any technical solution that modifies or substitutes this embodiment based on the technical principles disclosed in this invention without departing from the technical spirit of this invention should be included within the protection scope of this invention.

Claims

1. A valve resistance adaptive control optimization method based on flow rate variation, characterized in that: Includes the following steps, S1. Install the flow rate detector (3) on the pipe at the inlet end of the valve (1). The flow rate detector (3) detects the flow rate of the fluid in the pipe. The flow rate detector (3) is installed at the bottom end of a downwardly curved section (2). As the fluid begins to enter the curved section (2), the fluid is first discharged from a horizontal branch pipe (16) connected to the outlet side of the curved section (2). The flow rate of the fluid is recorded only after the fluid is discharged from the horizontal branch pipe (16). S2. The outlet end of the bend section (2) is connected to a horizontal water outlet section. The water outlet section is located above the horizontal branch pipe (16). When fluid is released from the horizontal branch pipe (16), the horizontal branch pipe (16) is immediately closed, allowing the fluid to flow into the water outlet section. S3. A resistance regulator (4) is also connected to the horizontal outlet pipe section. The resistance regulator (4) is controlled by a controller and can adjust the resistance to fluid flow in the outlet pipe section according to the detection value of the flow velocity detector (3). The outlet of the resistance regulator (4) is connected to a valve (1) that needs to be controlled. If the flow velocity increases, the resistance regulator (4) reduces the resistance to the fluid flowing through it. If the flow velocity decreases, the resistance to the fluid flowing through it increases.

2. The valve resistance adaptive control optimization method based on flow rate variation according to claim 1, characterized in that: The flow rate detector (3) used is a flow rate sensor.

3. The valve resistance adaptive control optimization method based on flow rate variation according to claim 1, characterized in that: The principle of the flow velocity detector (3) used is to first measure the flow rate k in the time period t, and the flow velocity v = k / t.

4. The valve resistance adaptive control optimization method based on flow rate variation according to claim 3, characterized in that: When the diameter of the pipe hole in the bend section (2) is less than 50mm, t is 15-18 seconds; when the diameter of the pipe hole in the bend section (2) is greater than 50mm but less than 100mm, t is 12-14 seconds; when the diameter of the pipe hole in the bend section (2) is greater than 100mm but less than 200mm, t is 9-12 seconds; when the diameter of the pipe hole in the bend section (2) is greater than 200mm but not more than 350mm, t is 3-6 seconds.

5. The valve resistance adaptive control optimization method based on flow rate variation according to any one of claims 1-4, characterized in that: The resistance regulator (4) used adjusts the resistance by changing its own flow path (14). When the resistance needs to be increased, the curvature of the flow path (14) increases, and when the resistance needs to be reduced, the curvature of the flow path (14) decreases. The flow path (14) is the only path into the valve (1).

6. The valve resistance adaptive control optimization method based on flow rate variation according to claim 5, characterized in that: The flow path (14) is wavy, and when the flow path changes, its cross-section does not change, or the rate of change does not exceed 5%.

7. A valve resistance adaptive control system based on flow rate variation, characterized in that, It includes a flow rate detector (3), a bend (2), a horizontal branch pipe (16), a controller, and a resistance regulator (4). The bend (2) is U-shaped, with both ends bent and extending horizontally. The flow rate detector (3) is installed at the center of the bottom of the bend (2). The controller is connected to a drive element to control the movement of the resistance regulator (4).

8. The valve resistance adaptive control system based on flow rate variation according to claim 7, characterized in that: The resistance regulator (4) includes a double-threaded pipe (6), a housing (13), and an elastic flow channel component (5). The two ends of the double-threaded pipe (6) are respectively threaded and sealed to the pipe connected to the bend section (2) and the housing (13). The elastic flow channel component (5) is axially installed inside the housing (13). The elastic flow channel component (5) is elastic and hollow inside. Its sidewall has an axially penetrating flow channel with an annular cross-section. The middle part of the flow channel is raised outward and bent into an arch shape to form a flow channel path for fluid to flow through. After the end of the double-threaded pipe (6) is screwed into the end of the housing (13), it can squeeze the end of the elastic flow channel component (5) and make the raised part (501) of its flow channel further arch. The driving element includes a motor, which drives the gear (601) fixedly sleeved on the outside of the double-ended threaded tube (6) to rotate. The motor is connected to the controller.

9. The valve resistance adaptive control system based on flow rate variation according to claim 7, characterized in that: The resistance regulator (4) includes an S-shaped pipe section connected between the bend section (2) and the valve (1). An arc-shaped telescopic pipe (7) is slidably installed at the outlet end of the S-shaped pipe. The outlet end of the arc-shaped telescopic pipe (7) extends into a groove (8) connected to the inlet of the valve (1) to provide fluid into the groove (8). The arc-shaped telescopic pipe (7) is driven to extend and retract by a hydraulic rod (15), which is connected to the controller.

10. The valve resistance adaptive control system based on flow rate variation according to any one of claims 7-9, characterized in that: The flow rate detector (3) includes a flow meter, which includes several leaf plates (10) arranged in a ring array on the side wall of the rotating shaft (9). The flow meter is installed in a cylindrical cavity at the bottom of the bent pipe section (2). The rotating shaft (9) is located in the center of the cavity. A code disk (11) is fixed to the top of the rotating shaft (9). A ring of magnetic poles is embedded in the code disk (11). A magnetic sensor (12) is provided above the edge of the code disk (11). The magnetic sensor (12) performs a count when it is aligned with the magnetic pole.

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