A positive and negative pressure system, comprising a positive and negative pressure chamber, a suction pump, an inflation pump, a controller, and positive and negative pressure airflow load generation processors;
- wherein, the positive and negative pressure chamber comprises a chamber body, a chamber door, an mechanical airtight mechanism, and an internal and external communicating sealer;
- the mechanical airtight mechanism is arranged between the chamber body and the chamber door;
- the internal and external communicating sealer is fixedly arranged at a rear part of the positive and negative pressure chamber, and all pipelines and circuits getting in and out the chamber are connected to and pass through the internal and external communicating sealer so as to keep a sealing property of the positive and negative pressure chamber;
- the positive and negative pressure chamber is externally provided with the suction pump, the inflation pump, and the controller;
- an air suction pipeline is installed at an air inlet of the suction pump, a first solenoid valve is installed at a middle part of the air suction pipeline, and an end of the air suction pipeline that is not connected to the air inlet of the suction pump extends into the positive and negative pressure chamber to form an air suction and air return port;
- an exhaust pipeline is installed at an air outlet of the suction pump, an end of the exhaust pipeline that is not connected to the air outlet of the suction pump is open to the atmosphere;
- an inflation pipeline is installed at an air outlet of the inflation pump, a second solenoid valve is installed at a middle part of the inflation pipeline, an end of the inflation pipeline that is not connected to the air outlet of the inflation pump, extends into the positive and negative pressure chamber to form an inflatable air inlet thereof;
- an air intake pipeline is installed at an air inlet of the inflation pump, a third solenoid valve is installed at a middle part of the air intake pipeline, and an end of the air intake pipeline that is not connected to the air inlet of the inflation pump is open to the atmosphere;
- a circulating pipeline is connected to the third solenoid valve, a fourth solenoid valve is installed at a middle part of the circulating pipeline, and an end of the circulating pipeline that is not connected to the third solenoid valve is connected to the second solenoid valve, and extends into the positive and negative pressure chamber through the inflation pipeline to form a circulating air return port of the positive and negative chamber;
- an end of a modified atmosphere air intake pipeline is in communication with a part of the inflation pipeline that is positioned between the second solenoid valve and the air outlet of the inflation pump, a fifth solenoid valve is installed at a middle part of the modified atmosphere air intake pipeline, an other end of the modified atmosphere air intake pipeline is in communication with an end of a modified atmosphere air outlet pipeline, a sixth solenoid valve is installed at a middle part of the modified atmosphere air outlet pipeline, an other end of the modified atmosphere air outlet pipeline extends into the positive and negative pressure chamber to form a modified atmosphere air inlet thereof;
- the positive and negative pressure chamber is internally provided with the positive and negative pressure airflow load generation processors, comprising a super oxygen generator, a negative ion generator, an air catalyst controlled release device, and a humidifier;
- the positive and negative pressure chamber is internally provided with sensors, comprising a pressure sensor, a negative pressure sensor, a super oxygen sensor, a negative oxygen ion sensor, a chlorine dioxide sensor, a humidity sensor, an oxygen sensor, and a nitrogen sensor;
- the suction pump, the inflation pump, the super oxygen generator, the negative ion generator, the air catalyst controlled release device, the humidifier, the sensors and the first to sixth solenoid valves are all connected to the controller,
- the controller is configured to control the suction pump, the inflation pump, the positive and negative pressure airflow load generation processors and the first to sixth solenoid valves in real time to operate in following manners according to built-in procedures and pre-stored data and real-time feedback information of various sensors:
- I, the first solenoid valve is opened to open the air suction pipeline and the exhaust pipeline, and the suction pump is turned on, so as to vacuumize an interior of the positive and negative pressure chamber to a set negative pressure;
- II, the second solenoid valve and the third solenoid valve are opened to open the inflation pipeline and the air intake pipeline, and the inflation pump is turned on, so as to inflate the interior of the positive and negative pressure chamber to a set positive pressure;
- III, the positive and negative pressure airflow load generation processors are turned on until a number and staying time of airflow loads in the chamber reach set values;
- and
- IV, the fifth solenoid valve and the sixth solenoid valve are opened to open the modified atmosphere air intake pipeline and the modified atmosphere air outlet pipeline, the second solenoid valve, the third solenoid valve and the fourth solenoid valve are opened to open the inflation pipeline, the circulating pipeline and the air intake pipeline, and the inflation pump is turned on to enable gases inside the positive and negative pressure chamber to circulate,
- wherein, in each of manners I-IV, each of the solenoid valves that are not mentioned is in a closed state.