CN114721444A - Pressure controller and control method thereof - Google Patents
Pressure controller and control method thereof Download PDFInfo
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- CN114721444A CN114721444A CN202210434381.9A CN202210434381A CN114721444A CN 114721444 A CN114721444 A CN 114721444A CN 202210434381 A CN202210434381 A CN 202210434381A CN 114721444 A CN114721444 A CN 114721444A
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- pressure
- fine adjustment
- outlet end
- adjustment unit
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D16/00—Control of fluid pressure
- G05D16/20—Control of fluid pressure characterised by the use of electric means
- G05D16/2006—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means
- G05D16/2013—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using throttling means as controlling means
Abstract
The invention discloses a pressure controller and a control method thereof, belongs to the technical field of pneumatic control, and can effectively shorten the pressure regulation time while ensuring the pressure regulation precision. The pressure controller comprises a control unit, and a pressure coarse adjustment unit, a pressure fine adjustment unit and a pressure measurement unit which are connected with the control unit; the pressure coarse adjustment unit and the pressure fine adjustment unit are arranged in parallel and connected in a gas transmission pipeline; the pressure measuring unit is arranged at the outlet end of the gas transmission pipeline and is used for measuring the pressure at the outlet end of the gas transmission pipeline in real time; the control unit is used for controlling the pressure coarse adjustment unit and the pressure fine adjustment unit to work simultaneously or controlling the pressure fine adjustment unit to work independently according to the difference degree between the outlet end pressure and the target pressure.
Description
Technical Field
The invention relates to a pressure controller and a control method thereof, belonging to the technical field of pneumatic control.
Background
A pressure controller is a specialized instrument that controls pressure in industrial process measurement and control systems, commonly referred to in the art as a pressure switch. It is an electrical switch that uses pressure as a control signal. A pressure controller is an electronic controller that automatically and quickly adjusts the output based on the supply pressure. Due to its high accuracy and control stability, the pressure controller is suitable for use as a pressure reference in production lines and laboratories for automatic testing and/or calibration of various sensors.
When the existing pressure controller works, an electromagnetic valve with a proper specification needs to be selected to work according to a target pressure value. If accurate pressure control is to be realized, an electromagnetic valve with high accuracy needs to be selected to work, and the electromagnetic valve with high accuracy has lower pressure regulating speed, so that the pressure regulating process can be completed within longer working time.
Disclosure of Invention
The invention provides a pressure controller and a control method thereof, which can effectively shorten the pressure regulation time while ensuring the pressure regulation precision.
The invention provides a pressure controller, which comprises a control unit, a pressure coarse adjustment unit, a pressure fine adjustment unit and a pressure measuring unit, wherein the pressure coarse adjustment unit, the pressure fine adjustment unit and the pressure measuring unit are connected with the control unit;
the pressure coarse adjustment unit and the pressure fine adjustment unit are arranged in parallel and connected in a gas transmission pipeline;
the pressure measuring unit is arranged at the outlet end of the gas transmission pipeline and is used for measuring the pressure at the outlet end of the gas transmission pipeline in real time;
the control unit is used for controlling the pressure coarse adjustment unit and the pressure fine adjustment unit to work simultaneously or controlling the pressure fine adjustment unit to work independently according to the difference degree between the outlet end pressure and the target pressure.
Optionally, the control unit is specifically configured to:
acquiring a fine adjustment pressure range according to the target pressure;
when the outlet end pressure is out of the fine adjustment pressure range, controlling the pressure coarse adjustment unit and the pressure fine adjustment unit to work simultaneously, and acquiring the outlet end pressure again after a preset time interval until the outlet end pressure is in the fine adjustment pressure range;
and when the outlet end pressure is within the fine adjustment pressure range, controlling the pressure fine adjustment unit to work independently until the outlet end pressure reaches the target pressure.
Optionally, the fine adjustment pressure range is (1-a) b to (1+ a) b;
wherein a is a preset percentage, and the value is between 10 and 20 percent; b is the target pressure.
Optionally, the control unit is specifically configured to:
when the outlet end pressure is smaller than the lower limit value of the fine adjustment pressure range, controlling the pressure coarse adjustment unit and the pressure fine adjustment unit to simultaneously perform pressure boosting work, and acquiring the outlet end pressure again after a preset time interval until the outlet end pressure is larger than or equal to the lower limit value of the fine adjustment pressure range;
when the outlet end pressure is larger than or equal to the lower limit value of the fine adjustment pressure range and is smaller than the target pressure, controlling the pressure fine adjustment unit to independently boost pressure until the outlet end pressure reaches the target pressure;
when the outlet end pressure is larger than the upper limit value of the fine adjustment pressure range, controlling the pressure coarse adjustment unit and the pressure fine adjustment unit to simultaneously reduce the pressure and obtain the outlet end pressure again after a preset time interval until the outlet end pressure is smaller than the upper limit value of the fine adjustment pressure range;
and when the outlet end pressure is greater than the target pressure and less than or equal to the upper limit value of the fine adjustment pressure range, controlling the pressure fine adjustment unit to independently reduce the pressure until the outlet end pressure reaches the target pressure.
Optionally, the pressure controller further comprises a pressure discharge unit, and the pressure discharge unit is electrically connected with the control unit;
the control unit is also used for controlling the pressure discharge unit to work when the difference value between the outlet end pressure and the target pressure is larger than zero until the difference value between the outlet end pressure and the target pressure is equal to zero.
Optionally, the control unit is further configured to control the working speeds of the pressure fine adjustment unit and the pressure coarse adjustment unit.
Optionally, the control unit is further configured to modify the target pressure and/or the preset percentage.
Optionally, the pressure measuring unit is a pressure sensor.
Optionally, the pressure coarse adjustment unit and the pressure fine adjustment unit are both solenoid valve pressure regulators.
The present invention also provides a control method of a pressure controller according to any one of the above, the control method including:
s1, acquiring a fine adjustment pressure range according to the target pressure;
s2, judging whether the outlet end pressure is out of the fine adjustment pressure range; if yes, go to S3; if not, go to S4;
s3, controlling the pressure coarse adjustment unit and the pressure fine adjustment unit to work simultaneously, and reacquiring the outlet end pressure after a preset time interval, and executing S2;
and S4, controlling the pressure fine adjustment unit to work independently until the outlet end pressure reaches the target pressure.
The invention can produce the beneficial effects that:
the pressure controller can control the pressure coarse adjustment unit and the pressure fine adjustment unit to simultaneously work to rapidly adjust the pressure or control the pressure fine adjustment unit to independently work to accurately adjust the pressure according to the difference degree between the pressure at the outlet end and the target pressure, so that the pressure adjustment time is effectively shortened while the pressure adjustment precision is ensured;
the pressure controller of the invention determines the fine adjustment pressure range according to the target pressure to be adjusted, controls the pressure coarse adjustment unit and the pressure fine adjustment unit to simultaneously and rapidly adjust the pressure outside the fine adjustment pressure range, and controls the pressure fine adjustment unit to independently work to accurately adjust the pressure within the fine adjustment pressure range, thereby ensuring the pressure adjustment precision and shortening the pressure adjustment time;
the pressure controller of the invention can realize the pressure control of medium and high pressure and high precision, realize the automatic pressure regulation of factories, reduce the errors caused by artificial pressure regulation, improve the quality and efficiency of pressure regulation and improve the safety performance of factory production.
Drawings
Fig. 1 is a schematic overall structure diagram of a pressure controller according to an embodiment of the present invention;
fig. 2 is a flowchart of a method of controlling a pressure controller according to an embodiment of the present invention.
List of parts and reference numerals:
1. a control unit; 2. a pressure coarse adjustment unit; 3. a pressure fine adjustment unit; 4. a pressure measuring unit; 5. a pressure discharge unit.
Detailed Description
The present invention will be described in detail with reference to examples, but the present invention is not limited to these examples.
The embodiment of the invention provides a pressure controller, which comprises a control unit 1, and a pressure coarse adjustment unit 2, a pressure fine adjustment unit 3 and a pressure measurement unit 4 which are connected with the control unit 1.
The pressure coarse adjustment unit 2 and the pressure fine adjustment unit 3 are arranged in parallel and connected in a gas transmission pipeline. Wherein, the pressure regulating speed of the pressure coarse regulating unit 2 is greater than that of the pressure fine regulating unit 3.
In this embodiment, the pressure adjusting rate of the pressure fine adjusting unit 3 is half of the pressure adjusting rate of the pressure coarse adjusting unit 2. The pressure coarse adjustment unit 2 and the pressure fine adjustment unit 3 are both solenoid valve pressure regulators, each solenoid valve pressure regulator comprises a plurality of solenoid valves, and the pressure of an outlet end is regulated by regulating the working pressure of the solenoid valves, the number of the solenoid valves and the drift diameter of the solenoid valves.
The electromagnetic valve is a zero-pressure starting direct-acting electromagnetic valve, the electromagnetic valve can execute frequent switching actions, the switching frequency per second is not less than 4 times, and the service life is not less than 10 ten thousand times.
The pressure measuring unit 4 is arranged at the outlet end of the gas transmission pipeline and used for measuring the pressure at the outlet end of the gas transmission pipeline in real time. The pressure measuring unit 4 may be, but is not limited to, a pressure measuring instrument, a pressure sensor, or the like. In this embodiment, the pressure measuring unit 4 is a pressure sensor.
The pressure measuring unit 4 may be integrated inside the pressure controller or may be arranged outside the pressure controller. When the pressure measuring unit 4 is disposed inside the pressure controller, the highest accuracy of the pressure controller can be up to 0.05%. When the load cell 4 is provided outside the pressure controller, the load cell 4 is a pressure sensor of a 4-20mA/1-5VDC signal system or a 4-20mA/0-10VDC signal system.
The control unit 1 is used for controlling the pressure coarse adjustment unit 2 and the pressure fine adjustment unit 3 to work simultaneously or controlling the pressure fine adjustment unit 3 to work independently according to the difference degree between the outlet end pressure and the target pressure.
The control unit 1 is specifically configured to:
acquiring a fine adjustment pressure range according to the target pressure;
when the outlet end pressure is out of the fine adjustment pressure range, controlling the pressure coarse adjustment unit 2 and the pressure fine adjustment unit 3 to work simultaneously, and obtaining the outlet end pressure again after a preset time interval until the outlet end pressure is in the fine adjustment pressure range;
and when the outlet end pressure is within the fine adjustment pressure range, controlling the pressure fine adjustment unit 3 to work independently until the outlet end pressure reaches the target pressure.
The invention shortens the pressure regulating time by shortening the working time of the pressure fine regulating unit 3.
Specifically, the fine adjustment pressure range is (1-a) b to (1+ a) b;
wherein a is a preset percentage, and the value is between 10 and 20 percent; b is the target pressure. Preferably, the preset percentage is 15%.
Specifically, when the outlet end pressure is smaller than the lower limit value of the fine adjustment pressure range, the pressure coarse adjustment unit 2 and the pressure fine adjustment unit 3 are controlled to simultaneously perform boosting operation, and the outlet end pressure is obtained again after a preset time interval until the outlet end pressure is larger than or equal to the lower limit value of the fine adjustment pressure range. The preset time period of the interval may be 1 second, 2 seconds, 5 seconds, and the like, and in this embodiment, the preset time period is 1 second.
And when the outlet end pressure is greater than or equal to the lower limit value of the fine adjustment pressure range and is less than the target pressure, controlling the pressure fine adjustment unit 3 to independently perform pressure boosting operation until the outlet end pressure reaches the target pressure.
When the outlet end pressure is larger than the upper limit value of the fine adjustment pressure range, the pressure coarse adjustment unit 2 and the pressure fine adjustment unit 3 are controlled to simultaneously reduce the pressure and obtain the outlet end pressure again after a preset time interval until the outlet end pressure is smaller than the upper limit value of the fine adjustment pressure range.
And when the outlet end pressure is greater than the target pressure and less than or equal to the upper limit value of the fine adjustment pressure range, controlling the pressure fine adjustment unit 3 to independently reduce the pressure until the outlet end pressure reaches the target pressure.
The control unit 1 is also used for controlling the working speed of the fine pressure regulating unit 3 and the coarse pressure regulating unit 2.
The control unit 1 is also used to modify the target pressure and/or the preset percentage.
The control unit 1 is also used for controlling the pressure coarse adjustment unit 2 to work independently.
The inlet air source of the pressure controller is dry and clean non-flammable, explosive and corrosive gases such as air, nitrogen and the like, and the maximum inlet pressure is 90 MPa.
The control unit 1 is a PLC controller, the working voltage of the control unit is 24V, and the control unit 1 controls the pressure coarse adjustment unit 2 and the pressure fine adjustment unit 3 to work through a pulse control method.
For example: when the preset percentage is 15% and the target pressure is 1000, the fine adjustment pressure range is 850-1150. When the outlet end pressure is less than 850, the control unit 1 controls the pressure coarse adjustment unit 2 and the pressure fine adjustment unit 3 to simultaneously boost pressure and work, and obtains the outlet end pressure again after 1 second interval until the outlet end pressure is greater than or equal to 850.
And when the outlet end pressure is larger than or equal to 850 and smaller than 1000, controlling the pressure fine adjustment unit 3 to independently perform boosting operation until the outlet end pressure reaches 1000.
When the outlet pressure is greater than 1150, the pressure coarse adjusting unit 2 and the pressure fine adjusting unit 3 are controlled to simultaneously reduce the pressure, and the outlet pressure is obtained again after 1 second interval until the outlet pressure is less than 1150.
When the outlet end pressure is greater than 1000 and less than or equal to 1150, the pressure fine adjustment unit 3 is controlled to independently reduce the pressure until the outlet end pressure reaches 1000.
The pressure controller also comprises a pressure discharge unit 5, and the pressure discharge unit 5 is electrically connected with the control unit 1. The inlet end of the pressure discharge unit 5 is connected with the gas transmission pipelines at one side of the outlet ends of the pressure coarse adjustment unit 2 and the pressure fine adjustment unit 3, and the outlet end of the pressure discharge unit 5 is connected with a gas collection system. The pressure discharge unit 5 is a solenoid valve pressure regulator,
the control unit 1 is further configured to control the pressure discharge unit 5 to operate when the difference between the outlet end pressure and the target pressure is greater than zero, until the difference between the outlet end pressure and the target pressure is equal to zero.
In one embodiment of the present invention, when the outlet pressure is greater than the target pressure and less than or equal to the upper limit of the fine adjustment pressure range, the pressure fine adjustment unit 3 is controlled to independently reduce the pressure and the pressure discharge unit 5 is controlled to discharge the excess pressure until the outlet pressure reaches the target pressure.
In another embodiment of the present invention, when the outlet pressure is greater than the target pressure and less than or equal to the upper limit of the fine adjustment pressure range, the pressure fine adjustment unit 3 is controlled to perform the pressure reduction operation alone until the outlet pressure reaches the target pressure. And then, acquiring outlet end pressure again after a preset time interval, and controlling the pressure discharge unit 5 to work until the difference between the outlet end pressure and the target pressure is zero when the difference between the outlet end pressure and the target pressure is greater than zero.
The pressure controller can control the pressure coarse adjustment unit 2 and the pressure fine adjustment unit 3 to work simultaneously to adjust the pressure quickly or control the pressure fine adjustment unit 3 to work independently to adjust the pressure accurately according to the difference degree between the pressure at the outlet end and the target pressure, so that the pressure adjustment time is effectively shortened while the pressure adjustment precision is ensured.
The pressure controller of the invention determines the fine adjustment pressure range according to the target pressure to be adjusted, controls the pressure coarse adjustment unit 2 and the pressure fine adjustment unit 3 to simultaneously and rapidly adjust the pressure outside the fine adjustment pressure range, controls the pressure fine adjustment unit 3 to independently work within the fine adjustment pressure range to accurately adjust the pressure, and can ensure the pressure adjustment precision and shorten the pressure adjustment time.
The pressure controller of the invention can realize the pressure control of medium and high pressure and high precision, realize the automatic pressure regulation of factories, reduce the errors caused by artificial pressure regulation, improve the quality and efficiency of pressure regulation and improve the safety performance of factory production.
An embodiment of the present invention provides a control method for a pressure controller in any one of the foregoing, where the control method includes:
s1, acquiring a fine adjustment pressure range according to the target pressure;
s2, judging whether the pressure at the outlet end is outside the fine adjustment pressure range; if yes, go to S3; if not, go to S4;
s3, controlling the pressure coarse adjustment unit 2 and the pressure fine adjustment unit 3 to work simultaneously, and acquiring outlet end pressure again after a preset time interval, and executing S2;
and S4, controlling the pressure fine adjustment unit 3 to work independently until the pressure at the outlet end reaches the target pressure.
Although the present application has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the application.
Claims (10)
1. A pressure controller is characterized by comprising a control unit, a pressure coarse adjustment unit, a pressure fine adjustment unit and a pressure measuring unit, wherein the pressure coarse adjustment unit, the pressure fine adjustment unit and the pressure measuring unit are connected with the control unit;
the pressure coarse adjustment unit and the pressure fine adjustment unit are arranged in parallel and connected in a gas transmission pipeline;
the pressure measuring unit is arranged at the outlet end of the gas transmission pipeline and is used for measuring the pressure at the outlet end of the gas transmission pipeline in real time;
the control unit is used for controlling the pressure coarse adjustment unit and the pressure fine adjustment unit to work simultaneously or controlling the pressure fine adjustment unit to work independently according to the difference degree of the outlet end pressure and the target pressure.
2. Pressure controller according to claim 1, characterized in that the control unit is specifically configured to:
acquiring a fine adjustment pressure range according to the target pressure;
when the outlet end pressure is out of the fine adjustment pressure range, controlling the pressure coarse adjustment unit and the pressure fine adjustment unit to work simultaneously, and acquiring the outlet end pressure again after a preset time interval until the outlet end pressure is in the fine adjustment pressure range;
and when the outlet end pressure is within the fine adjustment pressure range, controlling the pressure fine adjustment unit to work independently until the outlet end pressure reaches the target pressure.
3. A pressure controller according to claim 2, wherein the fine tuning pressure range is (1-a) b to (1+ a) b;
wherein a is a preset percentage, and the value is between 10 and 20 percent; b is the target pressure.
4. A pressure controller according to claim 2 or 3, characterized in that the control unit is specifically configured to:
when the outlet end pressure is smaller than the lower limit value of the fine adjustment pressure range, controlling the pressure coarse adjustment unit and the pressure fine adjustment unit to simultaneously perform pressure boosting work, and acquiring the outlet end pressure again after a preset time interval until the outlet end pressure is larger than or equal to the lower limit value of the fine adjustment pressure range;
when the outlet end pressure is larger than or equal to the lower limit value of the fine adjustment pressure range and is smaller than the target pressure, controlling the pressure fine adjustment unit to independently boost pressure until the outlet end pressure reaches the target pressure;
when the outlet end pressure is larger than the upper limit value of the fine adjustment pressure range, controlling the pressure coarse adjustment unit and the pressure fine adjustment unit to simultaneously reduce the pressure and obtain the outlet end pressure again after a preset time interval until the outlet end pressure is smaller than the upper limit value of the fine adjustment pressure range;
and when the outlet end pressure is greater than the target pressure and less than or equal to the upper limit value of the fine adjustment pressure range, controlling the pressure fine adjustment unit to independently reduce the pressure until the outlet end pressure reaches the target pressure.
5. The pressure controller of claim 1, further comprising a pressure venting unit electrically connected to the control unit;
the control unit is also used for controlling the pressure discharge unit to work when the difference value between the outlet end pressure and the target pressure is larger than zero until the difference value between the outlet end pressure and the target pressure is equal to zero.
6. The pressure controller of claim 1, wherein the control unit is further configured to control the operating speed of the fine pressure adjustment unit and the coarse pressure adjustment unit.
7. A pressure controller according to claim 3, characterised in that the control unit is also adapted to changing the target pressure and/or the preset percentage.
8. A pressure controller as claimed in claim 1, wherein the load cell is a pressure sensor.
9. The pressure controller of claim 1, wherein the coarse pressure regulation unit and the fine pressure regulation unit are both solenoid pressure regulators.
10. A control method of the pressure controller according to any one of claims 2 to 4, characterized by comprising:
s1, acquiring a fine adjustment pressure range according to the target pressure;
s2, judging whether the outlet end pressure is out of the fine adjustment pressure range; if yes, go to S3; if not, executing S4;
s3, controlling the pressure coarse adjustment unit and the pressure fine adjustment unit to work simultaneously, and reacquiring the outlet end pressure after a preset time interval, and executing S2;
and S4, controlling the pressure fine adjustment unit to work independently until the outlet end pressure reaches the target pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210434381.9A CN114721444A (en) | 2022-04-24 | 2022-04-24 | Pressure controller and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210434381.9A CN114721444A (en) | 2022-04-24 | 2022-04-24 | Pressure controller and control method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114721444A true CN114721444A (en) | 2022-07-08 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210434381.9A Pending CN114721444A (en) | 2022-04-24 | 2022-04-24 | Pressure controller and control method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114721444A (en) |
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2022
- 2022-04-24 CN CN202210434381.9A patent/CN114721444A/en active Pending
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