2results about How to "Stable differential pressure" patented technology

The application relates to the field of powder-liquid mixing production, and discloses a powder-liquid mixing and stirring device and a stirring method, wherein the powder-liquid mixing and stirring device comprises a stirrer, a stirring cavity is arranged in the stirrer, the stirring cavity is provided with a first connecting port, a second connecting port and a third connecting port, the height of the second connecting port is greater than that of the first connecting port, a liquid material metering tank is connected with the third connecting port in communication, the liquid material metering tank is used for providing liquid material, a powder metering tank is connected with the first connecting port in communication, the powder metering tank is provided with a first air pump, and a vacuum assembly is connected with the second connecting port of the stirring cavity in communication. According to the application, the powder in the powder metering tank enters the liquid material directly from the first connecting port by means of the positive pressure generated by the first air pump and the negative pressure generated by the negative pressure assembly, so that the dust raising phenomenon caused by the falling of the powder in the stirring cavity to the liquid material is avoided.

The application relates to a constant pressure variable air volume control method and related device for a barrier level laboratory animal room, which comprises the following steps: obtaining a current time and an indoor ammonia concentration, and selecting a mode based on the current time and the indoor ammonia concentration; wherein the selectable modes include a daytime mode and a nighttime mode; adjusting and setting a theoretical pressure difference of each functional area based on the nighttime mode, and adjusting a ventilation rate of each functional area, wherein the theoretical pressure difference of each functional area is set according to a preset pressure control gradient; calculating a theoretical air supply rate and a theoretical exhaust rate of each functional area based on the theoretical pressure difference and a functional area use condition; and adjusting a stroke time of each air supply damper based on the theoretical air supply rate and the theoretical exhaust rate. The application can adjust the working power of the system according to the day-night change and the activity level of animals, greatly saves energy while ensuring the ventilation quality, and has the advantages of green environmental protection.