5results about How to "Stable differential pressure" patented technology

Belonging to the field of petrochemical engineering, the invention discloses a catalytic slurry oil purification device, which comprises a tank body, and a feed end and a discharge end respectively arranged at two ends of the tank body. An upper partition plate and a lower partition plate are fixedly connected to the inner wall of the tank body, a discharging opening is formed in the upper partition plate, and a feeding opening is formed in the lower partition plate; the interior of the tank body is divided into three independent cavities by the upper partition plate and the lower partition plate; according to the scheme, the filter element is sleeved with the hollow cylinder, and the rotatable first spiral flow deflector is further arranged between the inner wall of the hollow cylinder and the outer wall of the filter element; a rotatable first spiral flow deflector is further arranged between the inner wall of the hollow cylinder and the outer wall of the filter element; a shear force generated by rotation of the first spiral flow deflector can prevent a filter cake on the surface of the filter element from forming a compact thick layer; a filter cake layer can be controlled within a relatively thin thickness range, and the rising speed of the pressure difference is delayed, so that the operation duration of a single filtering period is prolonged; and the single-time continuous treatment capacity of the device is greatly improved.

The application discloses a kind of dual fuel constant differential pressure valve and its differential pressure constant regulating method, belong to fluid pressure control technical field, the constant differential pressure valve includes outer shell, its inside is formed with first fuel high pressure chamber, first fuel low pressure chamber and second fuel high pressure chamber, first position is equipped in outer shell;Valve sealing assembly is set in outer shell, valve sealing assembly can be axially moved;Plunger assembly is set in outer shell, the bottom end of plunger assembly is used to bear the real-time pressure in second fuel high pressure chamber to axially move, the top end of plunger assembly is in abutment with valve sealing assembly;Spring is arranged in first fuel high pressure chamber, spring applies pre-tightening force to valve sealing assembly, and a kind of differential pressure constant regulating method of constant differential pressure valve is also disclosed.The application does not need external energy, sensor or controller, only by mechanical structure and fluid mechanics principle, realizes the independent, reliable and constant control of two kinds of independent fluid pressure difference that can be set.

The invention relates to the technical field of recovery systems, in particular to a fermented grain spreading cooling dead steam efficient recovery system and an intelligent control device thereof. According to the technical scheme, the waste steam collecting device comprises a gas collecting assembly, the gas collecting assembly comprises multiple sets of main gas pipes, multiple sets of connecting branch pipes are connected to the main gas pipes, one ends of the connecting branch pipes are connected with gas collecting hoods, and the multiple sets of gas collecting hoods are located above a fermented grain spreading and cooling machine, a steamer, a fermented grain turning position and a vinasse pouring position respectively and used for collecting waste steam generated at all positions; the condensing mechanism is connected to one end of the main air pipe and is used for condensing dead steam; and the intelligent resistance balance assemblies are respectively arranged on the fermented grain spreading and cooling machine branch and the steamer branch and are used for dynamically adjusting the resistance of each branch. The system can realize efficient capture and recovery of the dead steam in brewing production, reduces the operation energy consumption of the system, improves the response speed and the operation stability of the system to working condition fluctuation, and ensures efficient development of brewing production.

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.