Regulating valve self-correcting method

Abstract

The invention relates to the field of regulating valves, in particular to a self-correcting method for a regulating valve, and solves the technical problems that the opening degree of the regulating valve is uncertain and the regulating precision is difficult to control in the using process of the regulating valve at present. Comprising the steps that 1, a potentiometer and a pressure sensor are installed in the adjusting valve, the potentiometer is connected with a driving motor of the adjusting valve, the pressure sensor is used for monitoring pressure applied to a valve element by a valve rod, and another pressure sensor is installed on a pipeline where the adjusting valve is installed to monitor fluid pressure; 2, the first opening w1 (%) of the valve is obtained through potentiometer feedback data, and the second opening w2 (%) of the valve is obtained through pressure sensor data; 3, in the operation process, the first opening degree and the second opening degree of the adjusting valve are mutually verified so as to ensure that the adjusting valve is completely closed, the opening degree of the adjusting valve can be accurately confirmed, and it is ensured that the valve can be accurately closed and is not excessively closed.

Description

Technical Field

[0001] The present invention relates to the technical field of regulating valves, and in particular to a self-correcting method for regulating valves. Background Art

[0002] Control valves are widely used in industrial production to control the flow, pressure and temperature of fluids to ensure the stability of industrial processes. However, in practical applications, since there is no method to accurately measure the opening of control valves, the operator can only judge whether the control valve is fully opened or closed by the naked eye, which not only affects the stability of the entire production process, but also may cause energy waste and equipment damage.

[0003] The traditional control method of regulating valve opening mainly relies on valve stem position detection and flow detection, and accurately adjusts the position of the valve core by controlling the rotation of the drive motor. However, this method has the following problems: the specific position of the valve stem is uncertain, and it is unclear whether it is completely closed. At the same time, there is a lack of effective monitoring means, which will cause the regulating valve to be unable to adjust to the ideal opening position in time, affecting the control accuracy and stability of the system. Therefore, the development of a self-correcting regulating valve and its method that can comprehensively consider position, pressure and flow monitoring is of great significance to improving the accuracy and reliability of industrial process control. Summary of the invention

[0004] The purpose of the present invention is to provide a self-correcting method for a regulating valve, so as to solve the technical problems that the opening of the regulating valve is uncertain and the control accuracy is difficult to control during the use of the regulating valve.

[0005] The present invention provides a self-correction method for a regulating valve, comprising the following steps: step 1, installing a potentiometer and a pressure sensor in the regulating valve, wherein the potentiometer is connected to a driving motor of the regulating valve, the pressure sensor is used to monitor the pressure applied by a valve stem to a valve core, and another pressure sensor is installed on a pipeline where the regulating valve is installed to monitor fluid pressure; step 2, obtaining a first valve opening w1(%) through feedback data from the potentiometer, and obtaining a second valve opening w2(%) through data from the pressure sensor; step 3, during operation, the first opening and the second opening of the regulating valve are mutually verified to ensure that the regulating valve is completely closed.

[0006] According to one embodiment of the present invention, in step 2, the ratio of the number of rotations of the potentiometer to the total number of valve core travels is determined by the output voltage and input voltage of the potentiometer to obtain the first valve opening w1 (%).

[0007] According to one embodiment of the present invention, in step 2, the number of rotations of the potentiometer is n1, and the total number of valve core travels is N, then the first valve opening w1 is:

[0008] According to one embodiment of the present invention, in step 2, the output voltage of the potentiometer is V out , the input voltage of the potentiometer is V in , then the first valve opening is:

[0009] According to one embodiment of the present invention, in step 2, the data monitored by two pressure sensors are used to calculate the difference between the pressure applied by the valve stem to the valve core and the fluid pressure in the pipeline, and the pressure difference is compared with a preset pressure difference to obtain the second valve opening w2 (%).

[0010] According to one embodiment of the present invention, in step 2, the pressure applied by the valve to the valve core is F f , the pressure of the pipeline fluid acting on the valve core is F l , the second valve opening w2, the preset pressure difference is F, that is, the second valve opening w2 is:

[0011] According to one embodiment of the present invention, in step 2, the valve core sealing area S and the pipeline fluid pressure P, then the pressure F acting on the valve core by the pipeline fluid l For: F l =P*S.

[0012] According to one embodiment of the present invention, the preset pressure difference F in step 2 is set to 100N.

[0013] According to one embodiment of the present invention, during the closing operation of the regulating valve, if any one of the first opening and the second opening of the regulating valve does not reach 100%, the driving motor of the regulating valve continues to operate until both the first opening and the second opening are not less than 100% to ensure that the valve is completely closed.

[0014] The technical solution of the present invention has at least the following advantages and beneficial effects:

[0015] The present invention can accurately confirm the opening of the regulating valve and ensure that the valve can be accurately closed and not over-closed by installing a potentiometer and a pressure sensor in the regulating valve and using the data monitored by the two sensors for mutual verification. Specifically, the first opening of the valve can be calculated by monitoring the number of rotations of the valve stem and the input and output voltages of the drive motor through the potentiometer; the second opening of the valve can be calculated by the valve stem pressure and pipeline fluid pressure monitored by the two pressure sensors. Taking the two into consideration, the actual opening of the valve can be fully and accurately determined. During the operation of the regulating valve, the first opening and the second opening are continuously monitored. If any of the two openings does not reach 100%, the position of the valve stem will continue to be adjusted until both reach or exceed 100%, thereby ensuring that the valve is completely closed and not over-closed, and achieving the purpose of precise control. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 This is a flow chart of a self-correcting method for a regulating valve provided in Example 1 of the present invention.

[0018] Figure 2 This is a schematic structural diagram of a self-correcting regulating valve provided in Example 2 of the present invention.

[0019] Reference numerals:

[0020] 110, driving motor; 120, first gear shaft; 130, first gear; 140, second gear; 150, potentiometer;

[0021] 200, sleeve;

[0022] 300, annular pressure sensor;

[0023] 400, spring;

[0024] 500, valve body;

[0025] 610, motor base; 620, lower base. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0027] Example 1

[0028] Embodiment 1 of the present invention provides a self-correction method for a regulating valve, which can verify each other through monitoring data of a pressure sensor and a potentiometer to clarify the opening of the regulating valve.

[0029] See also Figure 1 The self-correction method of a regulating valve provided by an embodiment of the present invention comprises the following steps:

[0030] Step 1: Install a potentiometer and a pressure sensor in the regulating valve. The potentiometer is connected to the driving motor of the regulating valve. The pressure sensor is used to monitor the pressure applied by the valve stem to the valve core. Install another pressure sensor on the pipe where the regulating valve is installed to monitor the fluid pressure.

[0031] Step 2: Determine the ratio of the number of turns of the potentiometer to the total number of turns of the valve core through the output voltage and input voltage of the potentiometer to obtain the first valve opening w1 (%). Specifically, the number of turns of the potentiometer is n1, the total number of turns of the valve core is N, and the output voltage of the potentiometer is V out , the input voltage of the potentiometer is V in , then the first valve opening is: The data monitored by the two pressure sensors are used to calculate the difference between the pressure applied by the valve stem to the valve core and the pressure of the fluid in the pipeline, and the pressure difference is compared with the preset pressure difference to obtain the second valve opening w2 (%). Specifically, the pressure applied by the valve to the valve core is F f , the pressure of the pipeline fluid acting on the valve core is F l , the second valve opening w2, the preset pressure difference is F = 100N, the valve core sealing area S, the pipeline fluid pressure P, that is, the second valve opening w2 is:

[0032]

[0033] Step 3: During the closing operation of the regulating valve, if either the first opening or the second opening of the regulating valve does not reach 100%, continue to drive the driving motor of the regulating valve until both the first opening and the second opening are not less than 100% to ensure that the valve is completely closed.

[0034] Example 2

[0035] Embodiment 2 of the present invention provides a self-correcting regulating valve, which is used in the self-correcting method provided in Embodiment 1, so as to mutually verify the monitoring data of the pressure sensor and the potentiometer to clarify the opening of the regulating valve.

[0036] See also Figure 1 as well as Figure 2 , the self-correcting regulating valve provided in the embodiment of the present invention comprises a valve body 500, a driving component and a sensing component;

[0037] In this embodiment, the valve body 500 includes a valve core and a valve stem. The valve core is provided with a feed channel and a discharge channel. Either the valve stem or the valve core is provided with an abutting portion, and the other is provided with an abutting groove. Under the condition that the abutting portion abuts against the abutting groove, the feed channel and the discharge channel are spaced apart. In this embodiment, the valve core is provided with a receiving groove, and the receiving groove is used to accommodate the valve stem. The valve stem can reciprocate along the extension direction of the receiving groove to abut or be spaced against the bottom of the groove. The receiving groove is provided with a connected feed channel and a discharge channel. Under the condition that the valve stem abuts against the bottom of the groove, the feed channel and the discharge channel are spaced apart. Under the condition that the valve stem is spaced from the bottom of the groove, the feed channel and the discharge channel are connected.

[0038] In this embodiment, the driving assembly drives the valve stem to move so that the feed channel and the discharge channel are connected or isolated. In this embodiment, the valve stem and the valve core are threadedly connected so that the valve stem can be driven to rotate so that the valve stem can reciprocate along the extending direction of the receiving groove;

[0039] In this embodiment, the sensing assembly includes an annular pressure sensor 300 disposed between the driving assembly and the valve body 500 to detect the pressure applied by the driving assembly to the valve body 500. The annular pressure sensor 300 is sleeved on the valve stem.

[0040] In this embodiment, the valve stem includes a ring fixedly connected and sleeved on the valve stem, and the annular pressure sensor 300 is connected to the ring via a spring 400 to buffer the pressure applied by the drive assembly to the valve body 500 through the elastic action of the spring 400.

[0041] In this embodiment, the driving assembly includes a driving motor 110 and a driving motor shaft connected to each other, and the driving motor drives the motor 110 shaft to rotate.

[0042] In this embodiment, the valve stem is connected to the drive motor shaft through the sleeve 200. In this embodiment, the rotation of the drive motor shaft drives the valve stem to rotate, thereby driving the valve stem to reciprocate along the extension direction of the valve core accommodating groove.

[0043] In this embodiment, the drive assembly also includes a potentiometer 150, a first gear shaft 120, and a first gear 130 and a second gear 140 meshing with each other. The drive motor shaft is connected to the first gear shaft 120 through a coupling, and the potentiometer 150 is connected to the second gear 140. In this embodiment, the potentiometer 150 and the annular pressure sensor 300 are electrically connected to the central processing unit. In this embodiment, the drive assembly is connected to the control device, and the control device is electrically connected to the central processing unit. The central processing unit determines whether the valve body is completely closed by the self-correction method described in Example 1 through the data transmitted by the potentiometer and the annular pressure sensor. If any one of the first opening and the second opening does not reach 100%, the control device is continued to be driven, and then the drive motor of the regulating valve is driven to operate, and the drive assembly drives the valve stem to move to adjust to the desired position until the first opening and the second opening are not less than 100% to ensure that the valve is completely closed. In this embodiment, the stroke of the valve stem can be clearly determined through the continuous feedback of the potentiometer 150 and the annular pressure sensor, so that the position of the valve stem can be detected and fed back in real time, and the reciprocating position of the valve stem can be accurately controlled.

[0044] In this embodiment, it also includes a connected drive motor seat 610 and a lower base 620, which together form a first accommodating chamber, and the drive assembly and the valve body 500 are at least partially located in the accommodating chamber. In this embodiment, the potentiometer 150, the meshing first gear 130 and the second gear 140 are located in the accommodating chamber.

[0045] Example 3

[0046] Embodiment 3 of the present invention provides a self-correcting regulating valve, which can verify each other through monitoring data of a pressure sensor and a potentiometer to clarify the opening of the regulating valve.

[0047] The self-correcting regulating valve provided in the embodiment of the present invention is different from that in Embodiment 2 only in that, in the present embodiment, a flow meter is provided to monitor the flow in the discharge channel.

[0048] The embodiments of the present invention have at least the following advantages:

[0049] The self-correcting regulating valve and the self-correcting method provided by the present invention can accurately confirm the opening of the regulating valve by installing a potentiometer and a pressure sensor in the regulating valve and using the data monitored by the two sensors for mutual verification, so as to ensure that the valve can be accurately closed and not over-closed. Specifically, the first opening of the valve can be calculated by monitoring the number of rotations of the valve stem and the input and output voltages of the driving motor through the potentiometer; the second opening of the valve can be calculated by the valve stem pressure and the pipeline fluid pressure monitored by the two pressure sensors. Taking the two into consideration, the actual opening of the valve can be fully and accurately determined. During the operation of the regulating valve, the first opening and the second opening are continuously monitored. If any of the two openings does not reach 100%, the position of the valve stem will continue to be adjusted until both reach or exceed 100%, thereby ensuring that the valve is completely closed and not over-closed, and achieving the purpose of precise control. At the same time, the regulating valve monitors the flow of the discharge channel through the built-in flowmeter, further improving the control accuracy and stability of the regulating valve, and ensuring the accuracy of the fluid flow and the dual protection of the system safety.

[0050] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A self-correction method for a regulating valve, characterized in that: The following steps are involved: Step 1: Install a potentiometer and a pressure sensor in the regulating valve. The potentiometer is connected to the driving motor of the regulating valve. The pressure sensor is used to monitor the pressure applied by the valve stem to the valve core. Install another pressure sensor on the pipe where the regulating valve is installed to monitor the fluid pressure. Step 2: Obtain the first valve opening w1(%) through the potentiometer feedback data, and obtain the second valve opening w2(%) through the pressure sensor data; Step 3: During the operation, the first opening and the second opening of the regulating valve are checked against each other to ensure that the regulating valve is completely closed.

2. The self-correction method for a regulating valve according to claim 1, characterized in that: In step 2, the ratio of the number of turns of the potentiometer to the total number of turns of the valve core is determined by the output voltage and input voltage of the potentiometer to obtain the first valve opening w1 (%).

3. The self-correction method for a regulating valve according to claim 2, characterized in that: In step 2, the number of turns of the potentiometer is n1, and the total number of turns of the valve core is N. Then the first valve opening w1 is:

4. The self-correction method for a regulating valve according to claim 3, characterized in that: In step 2, the output voltage of the potentiometer is V out , the input voltage of the potentiometer is V in , then the first valve opening w1 is:

5. The self-correction method for a regulating valve according to any one of claims 1 to 4, characterized in that: In step 2, the data monitored by the two pressure sensors are used to calculate the difference between the pressure applied by the valve stem to the valve core and the fluid pressure in the pipeline, and the pressure difference is compared with the preset pressure difference to obtain the second valve opening w2 (%).

6. The self-correction method for a regulating valve according to claim 5, characterized in that: In step 2, the pressure applied by the valve to the valve core is F f , the pressure of the pipeline fluid acting on the valve core is F l , the second valve opening w2, the preset pressure difference is F, that is, the second valve opening w2 is:

7. The self-correction method for a regulating valve according to claim 6, characterized in that: In step 2, the valve core sealing area S, the pipeline fluid pressure P, and the pressure F acting on the valve core by the pipeline fluid l for: F l =P*S。 8. The self-correction method for a regulating valve according to claim 5, characterized in that: The preset pressure difference F in step 2 is set to 100N.

9. The self-correction method for a regulating valve according to any one of claims 1 to 4, characterized in that: During the closing operation of the regulating valve, if either the first opening or the second opening of the regulating valve does not reach 100%, the driving motor of the regulating valve continues to operate until both the first opening and the second opening are not less than 100% to ensure that the valve is completely closed.

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