A method for intelligent control and oxygen supply equipment switching of a roots blower for oxygen supply in aquaculture

Abstract

The application discloses a kind of for breeding oxygen supply Roots blower intelligent control and oxygen supply equipment switching method.The method comprises the following steps: S1 identifies oxygen supply equipment type and matches strategy;S2 automatically controls Roots blower start-stop according to dissolved oxygen value;S3 when accessing multiple Roots blowers, control start-stop quantity by grade;S4 executes safety mutual exclusion switching process, first close target valve and interlock, ensure the operation safety when with liquid oxygen common pipeline.The application also provides a controller for implementing the method, with an encrypted communication module interface, which can be integrated into an intelligent aquaculture system.The application realizes intelligent grading control and safe switching of Roots blower, and is suitable for aquaculture farms equipped with multiple oxygen supply equipment.

Description

Technical Field

[0001] This invention relates to the field of oxygen supply control technology in aquaculture, specifically to an intelligent control method for a Roots blower, and a safe switching method and controller when sharing a pipeline with a liquid oxygen supply device. Background Technology

[0002] Roots blowers, as a highly efficient mechanical aeration device, have been widely used in medium- and high-density aquaculture. Currently, most Roots blowers on the market use manual start / stop or simple timer control, lacking the ability to automatically adjust start / stop and operating levels based on dissolved oxygen levels in the water, thus failing to achieve on-demand oxygen supply and energy-saving operation. Meanwhile, some farms are equipped with both liquid oxygen supply devices and Roots blowers, sharing a single oxygen supply pipeline. When switching from one oxygen supply method to the other, it usually requires manual operation: first, manually stop the current equipment and close the corresponding valve, then manually open the target equipment and its corresponding valve. This process is not only cumbersome but also poses a safety hazard—if the operator mistakenly opens both valves simultaneously, high-pressure liquid oxygen may leak into the Roots blower or low-pressure pipeline, causing equipment damage or even a safety accident. In the existing technology, there are some solutions for switching oxygen supply equipment, but most of them involve the macro-level scheduling of gas sources in multiple ponds. They lack specific technical solutions for how to safely, automatically, and mutually exclusively perform switching operations when Roots blowers and liquid oxygen share pipelines in the same pond. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a control method and controller that can automatically control the start-up, shutdown and phased operation of a Roots blower according to the dissolved oxygen value, and can safely switch when sharing a pipeline with a liquid oxygen supply device. To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A control method for a Roots blower used in aquaculture oxygen supply is applied to an aquaculture system including a Roots blower, a liquid oxygen supply device, a shared oxygen supply pipeline, and a control valve assembly. The method includes: S1 Equipment identification and strategy matching; when both a Roots blower and a liquid oxygen supply device are detected to be connected simultaneously, steps S2 to S4 are executed; S2 automatically controls the start and stop of the Roots blower according to a preset dissolved oxygen threshold; S3 When multiple Roots blowers are connected, they are opened in stages according to the degree of dissolved oxygen value deviation; S4 When switching oxygen supply equipment is required, a safe mutual exclusion switching procedure is executed—first, the control valve on the side of the currently operating equipment is closed, and after confirming complete closure, the control valve on the side of the target equipment is opened. During the switching process, mutual exclusion interlocks are provided between the two valves to prevent simultaneous opening. Compared with the prior art, the beneficial effects of the present invention are as follows: it realizes the automatic start-stop and graded control of the Roots blower on demand, achieving precise energy saving; it realizes safe and mutually exclusive switching when sharing pipelines with liquid oxygen, eliminating the risk of human error; and it reserves an encrypted communication module interface, which can be plugged and played into the intelligent aquaculture system. Attached Figure Description

[0004] Figure 1 This is a flowchart of the control method of the present invention. Figure 2 This is a schematic diagram of the hardware interface architecture of the controller of the present invention. Detailed Implementation

[0005] The preferred embodiments of the present invention will now be clearly and completely described with reference to the accompanying drawings. Example 1: Control Method Flow like Figure 1 As shown in the figure, this embodiment provides a Roots blower control method, the specific process of which is as follows: S1. The controller identifies the type of oxygen supply equipment connected to the gas supply network. When it identifies that both a Roots blower and a liquid oxygen supply device are connected at the same time, it executes the subsequent steps. S2. Receive dissolved oxygen data in real time. Start the Roots blower when the dissolved oxygen value is ≤4mg / L and stop the Roots blower when the dissolved oxygen value is ≥7mg / L. S3. When multiple Roots blowers are connected, control them according to the following grading rules: one or two blowers are turned on at 6mg / L, half of them are turned on at 5mg / L, and all Roots blowers are turned on at 4mg / L. S4. When switching from a Roots blower to liquid oxygen supply, or vice versa, the controller executes a safe switching procedure: First, a pre-switching self-check is performed to confirm the current equipment status, pipeline pressure, and valve status are normal; then, the control valve on the currently operating equipment side is closed, and after confirming complete closure, the control valve on the target equipment side is opened, and the gas supply pressure is slowly adjusted to the operating range; during the switching process, electrical and software interlocks are installed between the two valves, and simultaneous opening is strictly prohibited. One-way valves are installed on both the Roots blower side and the liquid oxygen side to prevent gas backflow, and the controller monitors the status of the one-way valves in real time. After each switch, the controller also monitors pipeline pressure changes through pipeline pressure sensors; if the pressure drops abnormally, it is judged as a leak and an alarm is triggered. Example 2: Controller Hardware Interface like Figure 2As shown, this embodiment provides a controller for implementing the above method, including a control chip, a signal input interface, a drive output interface, an encrypted communication module interface, and a protection module. The signal input interface is used to receive signals from the dissolved oxygen probe, pipeline pressure sensor, and equipment status monitoring module. The drive output interface is used to drive the Roots blower, liquid oxygen supply device, and various control valves. The encrypted communication module interface is used for pluggable installation of the intelligent control module. The controller internally integrates a wide-voltage power management circuit, a lightning surge protection circuit, and a fully sealed waterproof structure. It should be noted that the above embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any equivalent method modifications or system architecture modifications made based on the concept of the present invention are included within the scope of protection of the present invention.

Claims

1. A method for controlling a Roots blower for aquaculture oxygen supply, applied to an aquaculture system including a Roots blower, a liquid oxygen supply device, a shared oxygen supply pipeline, and a control valve assembly, characterized in that, Includes the following steps: S1. Equipment identification and strategy matching: The controller identifies the type of oxygen supply equipment connected to the current gas supply network and matches the corresponding oxygen supply strategy according to the identification result; when it is identified that a Roots blower and a liquid oxygen supply device are connected at the same time, S2 to S4 are executed. S2. Automatic control of Roots blower: The controller automatically controls the start and stop of the Roots blower according to the preset start and stop thresholds; when the dissolved oxygen value is lower than the preset start threshold, the Roots blower is started; when the dissolved oxygen value is higher than the preset stop threshold, the Roots blower is stopped. S3, Roots blower segmented control: When multiple Roots blowers are connected, the controller starts the Roots blowers in segments according to the degree to which the dissolved oxygen value deviates from the starting threshold; when the dissolved oxygen value reaches the starting threshold, all Roots blowers are turned on. When the dissolved oxygen level is higher than the start-up threshold, a portion of the Roots blowers will be activated proportionally. S4. Safe and mutually exclusive switching: When it is necessary to switch from Roots blower oxygen supply to liquid oxygen supply, or from liquid oxygen supply back to Roots blower oxygen supply, the controller executes a safe switching procedure: first, close the control valve on the side of the currently operating equipment, and after confirming that it is completely closed, open the control valve on the side of the target equipment; during the switching process, there is a mutual exclusive lock between the two control valves, and simultaneous opening is prohibited.

2. The method according to claim 1, characterized in that, In S2, the preset start-up threshold of the Roots blower is 4 mg / L, and the preset stop threshold is 7 mg / L.

3. The method according to claim 1, characterized in that, In S3, the tiered control rule is as follows: when the dissolved oxygen value is 6 mg / L, one or two Roots blowers are turned on; when the dissolved oxygen value is 5 mg / L, half of the Roots blowers are turned on; when the dissolved oxygen value is 4 mg / L, all Roots blowers are turned on.

4. The method according to claim 1, characterized in that, In step S4, a self-test is performed before switching: the controller detects the status of the currently operating equipment, pipeline pressure, and valve status, and can only perform the switching after confirming that the switching conditions are met.

5. The method according to claim 1, characterized in that, In S4, a one-way valve is installed on both the Roots blower side and the liquid oxygen side to prevent gas backflow; the controller monitors the status of the one-way valves and automatically alarms and stops switching when there is an abnormality.

6. The method according to claim 1, characterized in that, It also includes pipeline leak detection: after each switching operation, the controller monitors the pipeline pressure change through the pipeline pressure sensor; if the pressure drops more than the preset threshold within a preset time, it is judged as a pipeline leak, an alarm is issued and the relevant valves are closed.

7. The method according to claim 1, characterized in that, It also includes aerator coordination: when the Roots blower has been started but the dissolved oxygen value continues to drop to the preset linkage threshold, the controller sends a start command to the aerator through the intelligent control module to coordinate oxygenation.

8. A controller for implementing the method according to any one of claims 1 to 7, characterized in that, include: Multiple signal input terminals are used to receive signals from the dissolved oxygen probe, pipeline pressure sensor and equipment status monitoring module, respectively; Multiple drive outputs are used to drive the Roots blower, liquid oxygen supply device and various control valves respectively; An encrypted communication module interface is used for pluggable installation of intelligent control modules to enable network communication with external devices; A control chip is configured to perform the method according to any one of claims 1 to 7.

9. The controller according to claim 8, characterized in that, The control valve is a solenoid valve or an electric valve; there are electrical and software interlocks between the control valve on the Roots blower side and the control valve on the liquid oxygen side to ensure that the two valves will not open at the same time.

10. The controller according to claim 8, characterized in that, It also includes a wide-voltage power management circuit, a lightning surge protection circuit, and a fully sealed waterproof structure integrated inside the controller.

Images