A proportional control valve and control method thereof

Abstract

The present application discloses a proportional control valve and a control method thereof, comprising a valve body, a valve core, an inlet, an outlet, a valve seat, a bolt, a valve stem, a spring, a tension spring, a spring seat and a travel scale. The two ends of the valve body are respectively provided with an inlet and an outlet, the valve core is connected to a reducer, the valve seat is fixedly arranged on the upper part of the valve body by bolts, the valve stem is arranged inside the valve seat, the valve stem penetrates the valve seat and connects the valve core; one end of the valve stem is fixedly connected to the travel scale, the travel scale is fixedly connected to a liquid level detector, the upper end of the valve stem is connected to a spring seat, the upper end of the spring seat is fixedly provided with a spring, tension springs are arranged at both ends of the spring seat, the tension springs are fixedly connected to the housing by bolts, and the valve body and the inlet and outlet are an integrated structure. The proportional control valve is a valve for controlling the valve opening size, and the liquid level detector is used to control the stability of the liquid level.

Description

Technical Field

[0001] The present application belongs to the field of valve technology, and specifically relates to a proportional control valve and a control method thereof. Background Art

[0002] When treating patients in hospitals, drugs are often infused into the patient's body by intravenous injection. Infusion bottles are one of the commonly used packaging containers for intravenous injection. The liquid medicine for treating the disease will be stored in the infusion bottle. The filling of the liquid medicine into the infusion bottle needs to be done in a pharmaceutical manufacturer. When the injection liquid is filled into the infusion bottle, a rotary filling system is used. A liquid level sensor is required to detect the liquid level height and a switch valve is used to control the filling liquid level height. The amount of liquid filled into the infusion bottle is controlled by controlling the liquid level height and the opening time of the filling valve. The method currently used to solve the filling amount control on the market is mainly to control it by using a high and low liquid level method. Its disadvantage is that the pressure generated at high and low liquid levels is inconsistent, resulting in differences and fluctuations in the amount of filling. Combined with the limitations of the above methods, a device that can stabilize the liquid level is needed to solve the above problems.

[0003] Application Contents

[0004] The technical problem to be solved by the present application is that the pressures generated when the liquid level is high and when the liquid level is low are inconsistent, resulting in differences and fluctuations in the amount of liquid loaded.

[0005] In order to solve the above technical problems, the solution of the present application is: a proportional control valve, including a valve body, a valve core, an inlet, an outlet, a valve seat, bolts, a valve stem, a spring, a tension spring, a spring seat and a travel scale, wherein the two ends of the valve body are respectively provided with an inlet and an outlet, the valve core is connected to a reducer, the valve seat is fixedly arranged on the upper part of the valve body by bolts, the valve stem is arranged inside the valve seat, the valve stem passes through the valve seat and connects the valve core; one end of the valve stem is fixedly connected to the travel scale, the travel scale is fixedly connected to a liquid level detector, the upper end of the valve stem is connected to the spring seat, the upper end of the spring seat is fixedly provided with a spring, tension springs are arranged at both ends of the spring seat, the tension springs are fixedly connected to the shell by bolts, and the valve body and the inlet and outlet are an integrated structure.

[0006] Preferably, the regulating valve is an intelligent solenoid valve.

[0007] Preferably, the valve body is made of corrosion-resistant material.

[0008] Preferably, the valve core is made of wear-resistant material.

[0009] Preferably, the shape and size of the valve stem in the valve body are optimized to reduce fluid pressure loss.

[0010] Preferably, there are two springs.

[0011] A control method for a proportional control valve comprises the following steps:

[0012] 1) Real-time collection of flow, pressure, and liquid level detection device signals;

[0013] 2) According to the flow error, flow error change rate and pressure error, the control signal of the driving mechanism is calculated by an intelligent control method based on a combination of fuzzy logic and PID control;

[0014] 3) Send the control signal to the driving mechanism to drive the valve core to move and adjust the fluid flow.

[0015] Preferably, the fuzzy logic control is used to process the uncertainty and nonlinear factors in the system and determine the preliminary control quantity according to the fuzzy inference rules; the PID control is used to eliminate the steady-state error of the system and accurately adjust the control quantity.

[0016] Preferably, the method further includes communicating with a host computer through a communication module to realize remote monitoring and control, and the host computer can set control parameters of the valve and check the working status.

[0017] Preferably, it also includes dynamically adjusting the valve opening according to real-time flow and pressure data so that the system operates at an optimal working point to reduce energy consumption.

[0018] Compared with the prior art, the beneficial effects of the present application are as follows: the liquid level height detected by the liquid level detection device is linked to the proportional control valve by setting the required liquid level target value. When the detected liquid level height is lower than the target value, the proportional valve is gradually opened, and when the detected liquid level is higher than the target value, the proportional valve is gradually closed, so as to achieve liquid level stability and thus achieve filling stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a cross-sectional view of the present invention. DETAILED DESCRIPTION

[0020] The specific embodiments of the present application are further described below in conjunction with the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present application, but does not constitute a limitation of the present application. In addition, the technical features involved in the various embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0021] Reference Figure 1A proportional control valve comprises a valve body 1, a valve core 2, an inlet 3, an outlet 4, a valve seat 5, a bolt 6, a valve stem 7, a spring (8), a tension spring 9, a spring seat 10 and a travel scale 11, wherein the two ends of the valve body 1 are respectively provided with an inlet 3 and an outlet 4, the valve core 2 is connected to a reducer 21, the valve seat 5 is fixedly arranged on the upper part of the valve body 1 by means of a bolt 6, the valve stem 7 is arranged inside the valve seat 4, the valve stem 7 penetrates the valve seat 5 and is connected to the valve core 2; one end of the valve stem is fixedly connected to the travel scale 11, the travel scale 11 is fixedly connected to a liquid level detector 14, the upper end of the valve stem 7 is connected to the spring seat 10, the upper end of the spring seat 10 is fixedly provided with a spring 8, the two ends of the spring seat 10 are provided with tension springs 9, the tension springs 9 are fixedly connected to a housing 12 by means of bolts, and the valve body 1 and the inlet 3 and the outlet 4 are an integrated structure.

[0022] Specifically, the regulating valve is an intelligent solenoid valve. Using an intelligent solenoid valve can improve work efficiency and reliability.

[0023] Furthermore, the valve body 1 is made of corrosion-resistant material, thereby increasing the service life of the valve body 1.

[0024] Furthermore, the valve core 2 is made of wear-resistant material to increase the service life of the valve core.

[0025] Furthermore, the shape and size of the valve stem 7 in the valve body 1 are optimized to reduce fluid pressure loss.

[0026] Furthermore, there are two springs 8 to increase the stability of the regulating valve.

[0027] A control method for a proportional control valve comprises the following steps:

[0028] 1) Real-time collection of flow, pressure, and liquid level detection device signals;

[0029] 2) According to the flow error, flow error change rate and pressure error, the control signal of the driving mechanism is calculated by an intelligent control method based on a combination of fuzzy logic and PID control;

[0030] 3) Send the control signal to the driving mechanism to drive the valve core to move and adjust the fluid flow.

[0031] Furthermore, the fuzzy logic control is used to deal with the uncertainty and nonlinear factors in the system and determine the preliminary control quantity according to the fuzzy inference rules; the PID control is used to eliminate the steady-state error of the system and accurately adjust the control quantity.

[0032] Furthermore, the communication module communicates with the host computer to realize remote monitoring and control, and the host computer can set the control parameters of the valve and check the working status.

[0033] Furthermore, the valve opening is dynamically adjusted based on real-time flow and pressure data so that the system operates at the optimal working point to reduce energy consumption.

[0034] The working principle of the present application is: when the liquid level detected by the liquid level detector is lower than the target liquid level, the intelligent proportional control valve increases the opening of the proportional control valve by calculating the control signal of the driving mechanism through an intelligent control method based on a combination of fuzzy logic and PID control; when the liquid level detected by the liquid level height detection device is higher than the target liquid level, the opening of the proportional control valve decreases, so as to ensure that the liquid level is always stable at the target liquid level. The proportional control valve is a valve that controls the size of the valve opening, and the liquid level detector is used to control the stability of the liquid level.

[0035] The embodiments of the present application are described in detail above in conjunction with the accompanying drawings, but the present application is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions and variations of these embodiments are made without departing from the principles and spirit of the present application, and still fall within the scope of protection of the present application.

Claims

1. A proportional control valve, comprising a valve body (1), a valve core (2), an inlet (3), an outlet (4), a valve seat (5), a bolt (6), a valve stem (7), a spring (8), a tension spring (9), a spring seat (10) and a travel scale (11), characterized in that: The valve body (1) is provided with an inlet (3) and an outlet (4) at both ends respectively; the valve core (2) is connected to a reducer (21); the valve seat (5) is fixedly arranged on the upper part of the valve body (1) by means of bolts (6); the valve stem (7) is arranged inside the valve seat (4); the valve stem (7) penetrates the valve seat (5) and is connected to the valve core (2); one end of the valve stem is fixedly connected to a stroke scale (11); the stroke scale (11) is fixedly connected to a liquid level detector (14); the upper end of the valve stem (7) is connected to a spring seat (10); a spring (8) is fixedly arranged on the upper end of the spring seat (10); tension springs (9) are arranged at both ends of the spring seat (10); the tension springs (9) are fixedly connected to a housing (12) by means of bolts; the valve body (1) and the inlet (3) and the outlet (4) are an integrated structure.

2. The proportional control valve according to claim 1, characterized in that: The regulating valve is an intelligent solenoid valve.

3. The proportional control valve according to claim 1, characterized in that: The valve body (1) is made of corrosion-resistant material.

4. The proportional control valve according to claim 1, characterized in that: The valve core (2) is made of wear-resistant material.

5. The proportional control valve according to claim 1, characterized in that: The shape and size of the valve stem (7) in the valve body (1) are optimized to reduce fluid pressure loss.

6. The proportional control valve according to claim 1, characterized in that: There are two springs (8).

7. A control method for a proportional control valve, characterized in that: The following steps are involved: 1) Real-time collection of flow, pressure, and liquid level detection device signals; 2) According to the flow error, flow error change rate and pressure error, the control signal of the driving mechanism is calculated by an intelligent control method based on a combination of fuzzy logic and PID control; 3) Send the control signal to the driving mechanism to drive the valve core to move and adjust the fluid flow.

8. The control method of the proportional control valve according to claim 7, characterized in that: The fuzzy logic control is used to deal with the uncertainty and nonlinear factors in the system and determine the preliminary control quantity according to the fuzzy inference rules; the PID control is used to eliminate the steady-state error of the system and accurately adjust the control quantity.

9. The control method of the proportional control valve according to claim 7, characterized in that: It also includes communicating with the host computer through the communication module to achieve remote monitoring and control. The host computer can set the control parameters of the valve and view the working status.

10. The control method of the proportional control valve according to claim 7, characterized in that: It also includes dynamically adjusting valve opening according to real-time flow and pressure data so that the system operates at the optimal working point to reduce energy consumption.

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