79 results about "Mechanical ventilation" patented technology

The invention relates to the technical field of flame retardant property detection of fireproof materials, in particular to a detection device and a detection method for evaluating the flame retardant property of a facing type fireproof coating. According to the detection device, a combustion space close to an actual building environment is provided, on one hand, the state of the ventilation opening is adjusted through the electric louver, different ventilation conditions such as natural ventilation, mechanical ventilation or ventilation blocking when a fire occurs are simulated, and the coating is tested in various airflow environments; on the other hand, a heat radiation source is arranged to simulate a heat radiation environment around a material in a fire, non-uniform heat radiation intensity distribution is set to be similar to a real fire scene heat source complex condition, and the performance of the coating under different heat radiation conditions is tested. Besides, the gas mixer can dynamically adjust the oxygen concentration in the cabin according to the test requirement, so that the conventional oxygen index test is met, the oxygen content change in the fire process can be simulated, and the flame-retardant performance of the coating in the actual oxygen content fluctuation scene is explored.

The utility model discloses a constant-humidity cultural relic storage cabinet in the technical field of storage equipment, which comprises a cabinet body, a storage table is fixedly connected inside the lower end of the cabinet body, a cabinet door for sealing is mounted on the surface of the cabinet body, a humidifier is fixedly connected on the surface of the cabinet body, a humidifying pipe is mounted on the humidifier, and the cabinet door is fixedly connected with the humidifier. The humidifying pipe is inserted into the cabinet body and located below the storage table, and humidifying nozzles are uniformly distributed on the surface of the humidifying pipe; according to the scheme, the interior of the cabinet body can be humidified through the humidifier, when cultural relics are stored in a sealed environment in the cabinet body, the humidity in the cabinet body can be adjusted and controlled, and therefore safe storage of the cultural relics is effectively protected, meanwhile, the surface of the cabinet body is connected with the circulating pipe, and the two ends of the circulating pipe communicate with the upper side and the lower side of the cabinet body correspondingly; furthermore, the motor is started to drive the fan blades to rotate, and mechanical ventilation is formed in the cabinet body, so that the humidity in the cabinet body is kept uniform.

The utility model relates to the technical field of granary mechanical ventilation, and discloses a granary ventilation corner cage which comprises a supporting frame connected with the granary wall face in an installed mode, a ventilation hood is arranged at the end, away from the granary wall face, of the supporting frame, and the ventilation hood is detachably connected with the supporting frame. A vertically-through airflow channel is formed between the ventilation hood and the supporting frame, ventilation holes communicated with the airflow channel are formed in the ventilation hood, and a sealing part is arranged on the portion, on the top of the airflow channel, of the supporting frame. According to the utility model, the problem of ventilation dead angles at four corners of a warehouse can be solved, the probability of mildew of grain piles at wall corners is reduced, and the safety of grain storage is improved.

The present application relates to a kind of energy-saving and environment-friendly mechanical ventilation cooling tower, by optimizing the gap design of cooling fan blade and wind cover, using the negative pressure generated by blade rotation to suck in cooling air, and the hot water in heat dissipation assembly forms convection heat exchange, realizes efficient cooling.At the same time, the ascending airflow drives the blade with porous fiber bundle to rotate, on the one hand, the kinetic energy is recovered by wind power generator and converted into stable electric energy through control inverter unit, on the other hand, the water vapor in air is absorbed and condensed by porous fiber bundle, and water resources are recovered.The present application does not need to transform existing cooling tower, with simple structure, easy installation, energy saving, water saving and environmental protection effect, and significant economic benefit.

A process, a signal processing unit and to a ventilator automatically calculate a set point for a frequency, with which the ventilator performs ventilation strokes and thereby mechanically ventilates the patient. An alveolar or proximal minute volume is predefined. A lung time constant for the lungs of the patient is determined. The volume of a dead space in a fluid connection between the lungs and the ventilator is determined. A mandatory frequency set point (fset,mand) for the mandatory ventilation of the patient is calculated. An ideal frequency (fspon), with which the patient can achieve the minute volume by means of spontaneous breathing, is calculated. The ventilation frequency set point is calculated as a weighted average of the mandatory frequency set point (fset,mand) and of the ideal frequency (fspon). The averaging depends on a determined actual intensity of the spontaneous breathing of the patient.

The utility model discloses a box body of a skid-mounted prefabricated pump room, and mainly relates to the field of prefabricated pump rooms. Comprising a bottom frame, a bottom plate is fixed in the bottom frame, a box body vertically extending upwards is fixedly installed on the peripheral side of the bottom frame, exhaust fans are installed on the top side of the box body, at least half of the exhaust fans are located above the box body, and a top frame matched with the box body in a lifting mode is arranged above the box body. A top plate is fixed in the top frame, a lifting baffle is fixed to the peripheral side of the top frame, and the bottom side of the lifting baffle and the top side of the box body can cover each other. The ventilation system has the advantages that natural ventilation and mechanical ventilation can be combined and utilized, and the efficient ventilation effect of saving energy and reducing consumption is achieved.

The application relates to a ship air exhaust technology field, in particular to a control method of a cabin air intake and exhaust machine, frequency of the variable frequency air supply and exhaust mechanical ventilation is very high, the variable frequency control method is optimized, the requirements of the ship owner can be met, better market can be won, the air intake and exhaust amount of the cabin is controlled through the more optimized variable frequency control method, the problem that the low-frequency work of the variable frequency air supply machine cannot meet the required air consumption of the large load working condition of the main generator in the low-temperature environment of the cabin in winter is solved, and the method is suitable for the SOV ship type with small space and compact layout.

The utility model relates to the technical field of cooling towers, and provides a mechanical ventilation cooling tower water retaining device which comprises a tower body. The supporting table is fixedly connected to the upper end of the inner wall of the tower body; the rotating frame is fixedly connected to the top end of the sliding block; the limiting grooves are symmetrically formed in the inner wall of the rotating frame, water retaining frames are arranged in the rotating frame at equal angles, limiting strips are fixedly connected to the two sides of each water retaining frame, water retaining plates are fixedly connected to the inner walls of the water retaining frames at equal intervals, and a handle is fixedly connected to one side of each water retaining frame. A cover plate is clamped on one side of the tower body; through the arrangement of the mounting assembly, quick disassembly and assembly of the water fender are achieved, quick sliding disassembly and assembly between the water retaining frame and the rotating frame are facilitated through a handle, meanwhile, the sliding block can slide out of the supporting table through the notch, and then quick disassembly and assembly maintenance of the rotating frame and the water fender can be achieved; tedious and inconvenient disassembly and assembly caused by a traditional bolt fixing mode and the like are avoided, and the practicability is improved.

The invention relates to the technical field of circulating cooling equipment, in particular to a blast closed type mechanical ventilation cooling tower, a circulating cooling system and a using method. A blast closed type mechanical ventilation cooling tower comprises a tower body, the tower body is internally provided with a heat exchange space and a liquid collection space, the heat exchange space is communicated with the liquid collection space, and the first bottom face of the heat exchange space is higher than the second bottom face of the liquid collection space; the heat exchange assembly comprises a heat exchanger, the heat exchanger is arranged in the heat exchange space, and liquid to be cooled flows in the heat exchanger; and the cooling assembly comprises a cooling spray head and a cooling pipe, the cooling spray head is arranged in the heat exchange space, the cooling pipe is connected with the liquid collecting space and the cooling spray head, and cooling liquid is contained in the liquid collecting space. The invention provides a blast closed type mechanical ventilation cooling tower, a circulating cooling system and a using method, and aims to solve the problems that when a pipeline of a user cooling system is broken, cooling water is mixed with liquid releasing decay heat, and the liquid releasing decay heat is brought into the mechanical ventilation cooling tower by the cooling water.

The utility model relates to the technical field of fermentation tanks, and discloses a combined mechanical ventilation fermentation tank which comprises a base and a fermentation tank body fixedly mounted in the middle of the top of the base, a translation plate is arranged at the upper part, close to the left side, of the top of the fermentation tank body, and a hydraulic cylinder is fixedly mounted in the middle of the top of the translation plate; through the mutual cooperation of the side plates, the threaded rods, the threaded sleeves, the fixed rods, the driven gears, the driving gears and the servo motors A, the translation plates can be driven to move left and right back and forth above the fermentation tank, so that the follow-up material turning work is facilitated; through mutual cooperation of a protective shell, a rotating shaft, a belt, a material overturning disc, a transmission rod, a movable gear, fan blades and a fixed rack plate, the material overturning disc can be driven to move in the fermentation tank under the moving action of a translation plate, raw materials are overturned and better fermented, and the material overturning disc can be driven to rotate in the moving process, so that the material overturning effect is improved. And the material turning effect is better.

The utility model relates to the technical field of punching machines, and in particular to a punching machine for mechanical ventilation protective hoods. The utility model provides a punching machine for mechanical ventilation protective hoods that can adapt to protective hoods of different sizes. A punching machine for mechanical ventilation protective hoods, comprising a punching machine body, a bracket, a square block, a fixing assembly and an adjusting assembly; the front of the punching machine body is connected to a bracket, the upper side of the bracket is connected to a square block, the front of the punching machine body is provided with a fixing assembly for fixing the ventilation protective hood, the fixing assembly is provided with an adjusting assembly, and the adjusting assembly is used to adjust the fixing assembly to adapt to ventilation protective hoods of different sizes. The protective hood is placed on the square block, and the left and right splints move downward to press the left and right sides of the protective hood to fix it, and then punching is performed through the punching machine body. Under the cooperation of the screw and the nut, the position of the splint can be adjusted left and right to adapt to protective hoods of different sizes.

Automated System for Airway Secretion Management and Ventilation Synchronization The invention relates to an automated suctioning system (100) for simultaneous suctioning (in pulsatile mode) and ventilation of tracheal secretions, improving airway management in mechanically ventilated patients. It includes a vacuum pump (101), a modified multilumen endotracheal tube (102) with valves for suction control, an oral suction adopter (103), subglottic suction tubing (104), and a ventilation-suction switch (105) to synchronize suctioning and ventilation. A lumen obstruction detector (106) identifies obstructions, while an RTOS-based microcontroller (107) manages real-time tasks. Pressure sensors (108, 109) monitor suction levels and detect blockages, and a liquid dispensing system (110) delivers mucolytic agents. A user interface device (111) provides feedback and alerts. The system dynamically adjusts suction pressure, ensuring patient safety, reducing ventilation interruptions, and enhancing secretion management in critical care settings.

The invention relates to the technical field of mechanical cooling tower circulating cooling water saving, in particular to an opening adjustment design method of a demisting mesh enclosure, which comprises the following steps: S1, in order to ensure the cooling efficiency of a mechanical ventilation cooling tower and the energy balance of a system, the heat exchange enthalpy value of the cooling tower needs to be considered in the opening design of the demisting mesh enclosure; water is in contact with air for heat exchange, part of water evaporates to take away latent heat, and therefore the cooling effect is achieved, and in the enthalpy difference method, the basic thermodynamic calculation equation of the cooling tower is shown as # imgabs0 #. Wherein # imgabs 1 # is a cooling number or an exchange number and represents the cooling capacity of the cooling tower; # imgabs2 is the heat dissipating capacity of water, and kilowatt (kW) is taken as a unit; and # 3 imgabs3 is the air volume of the cooling tower, and kilogram per second (kg / s) is taken as the unit. By accurately calculating the heat dissipating capacity and the ventilation quantity of the cooling tower and considering the influence of the demisting mesh enclosure on the ventilation quantity, the method can ensure that the cooling efficiency of the cooling tower is kept unchanged after the demisting mesh enclosure is additionally arranged, so that the energy balance of the system is maintained.

The utility model provides a mechanical draft cooling tower, which relates to the technical field of cooling towers and comprises a cooling tower body, an air inlet filter is fixedly connected outside an air inlet of the cooling tower body, and a protective screen plate is mounted in front of the inside of the air inlet filter. The lower edge of the protective screen plate is hinged to the bottom of the interior of the air inlet filter through supporting shafts on the two sides, a driving motor is installed on the right surface of the air inlet filter through bolts, and after the cooling tower stops running, the protective screen plate shakes under the cooperation of the driving motor and a vibration rotating disc; impurities attached to the surface of the protective net plate can fall off under the shaking action of the protective net plate, so that the problem that the cooling efficiency of the cooling tower is influenced by air permeability reduction caused by the fact that the impurities block the protective net plate is avoided, efficient cleaning of the cooling tower is facilitated, and the problems that after a traditional protective net intercepts the impurities, part of the impurities are attached to the protective net and cannot fall off, and the cooling efficiency of the cooling tower is affected are solved. The air permeability of the protective net is reduced, the power consumption of the cooling tower is increased, and the cooling efficiency of the cooling tower is reduced.

The utility model relates to the technical field of outdoor articles, and discloses a refrigeration heat preservation tent with an air flowing function, which comprises an outer support and an outer tent, the outer tent is connected with the outer support, the outer support is used for supporting the outer tent, the inner tent is arranged on the inner side of the outer tent, and an inner support is further arranged on the surface of the inner tent. The inner support is used for supporting the inner tent, and the outer tent and the inner tent are spaced by a distance to form an air interlayer area; the air supply assembly is arranged on the surface of the outer tent and used for supplying air outside the outer tent into the air interlayer area so as to form air flow in the air interlayer area to isolate heat. According to the refrigeration and heat preservation tent with the air flowing function, the double-layer mechanical ventilation design is adopted for the tent, and a semi-conductive refrigeration material is combined, so that effective control over the temperature in the tent is achieved, and the comfort level of a user is improved.

The utility model provides a kind of clamping and fixing device of measuring cooling tower drift rate filter paper, located cooling tower air outlet pipe top, including support plate and clamping component, the end face of support plate away from cooling tower is placed with filter paper, and the through hole corresponding with filter paper is opened on support plate, and the through hole is completely covered by filter paper;Support plate is provided with multiple, and multiple support plates are interconnected to correspond different size cooling tower air outlet pipe;The clamping component is set to the end face of support plate away from cooling tower, and the clamping position of clamping filter paper is formed between clamping component and support plate.The utility model has beneficial effect: the clamping device designed in the present application is simple to disassemble, small in occupied volume, suitable for detection, ready-to-use and installation, and the device is more convenient to set, modular expansion is achieved, and various structures such as mechanical ventilation cooling tower, closed tower and the like are adapted.

The invention relates to an automated suctioning system (100) for simultaneous suctioning (in pulsatile mode) and ventilation of tracheal secretions, improving airway management in mechanically ventilated patients. It includes a vacuum pump (101), a modified multilumen endotracheal tube (102) with valves for suction control, an oral suction adopter (103), subglottic suction tubing (104), and a ventilation-suction switch (105) to synchronize suctioning and ventilation. A lumen obstruction detector (106) identifies obstructions, while an RTOS-based microcontroller (107) manages real-time tasks. Pressure sensors (108, 109) monitor suction levels and detect blockages, and a liquid dispensing system (110) delivers mucolytic agents. A user interface device (111) provides feedback and alerts. The system dynamically adjusts suction pressure, ensuring patient safety, reducing ventilation interruptions, and enhancing secretion management in critical care settings.

The application discloses a kind of based on mountain top geographical advantage sewage zero discharge spray evaporation method, belong to sewage advanced treatment and ultimate disposal technical field.The system will be wholely set in mountain top, ridge or other altitude significantly higher than the geographical position of pre-treatment unit and sensitive area.Spray evaporation field system includes with low-position clear water source connection high-pressure water supply system, atomizing nozzle array arranged in mountain top and intelligent control system.The method makes full use of the natural advantages of mountain top perennial wind, atmospheric diffusion condition is good, pre-treatment standard clear water is sprayed to high altitude by high-pressure atomization, realizes quick evaporation and zero liquid discharge.The core invention point is: by geographical high-position arrangement, natural ventilation evaporation efficiency is greatly strengthened, and mechanical ventilation energy consumption can be basically or completely saved;Utilize topographic relief to form natural environmental isolation zone, minimize the visual and odor impact of spray process on surrounding environment;And can realize intensive layout with the same built in mountain top biological treatment unit (such as three-dimensional natural ventilation biological membrane array tower) and potential energy sharing, build complete low-energy consumption mountainous area sewage zero discharge treatment system.

The invention discloses a mixed ventilation indirect cooling tower with a cross-shaped wind-break wall with a rotating shaft, relates to the field of power plants, and mainly aims to solve the problems that an existing indirect cooling tower is low in ventilation efficiency and large in energy consumption in a complex meteorological environment. The indirect cooling tower comprises a cooling tower body, a horizontal retaining wall, a cooling triangle, the cross-shaped wind-break wall, the rotating shaft and an axial flow fan; by combining two mixed ventilation modes of natural ventilation and mechanical ventilation, the air flowing path is optimized, and the ventilation efficiency is improved. The rotating shaft is arranged on the cross-shaped wind break wall of the indirect cooling tower, the angle of the wind break wall can be adjusted according to the wind speed and the wind direction, and therefore the speed and the flow direction of air entering the tower are controlled, and it is guaranteed that the indirect cooling tower efficiently runs under different weather conditions. The energy efficiency ratio of the indirect cooling tower can be remarkably increased, energy consumption is reduced, good ventilation performance can still be kept in the high-temperature and high-wind-speed environment, and the indirect cooling tower has wide application prospects and is particularly suitable for the fields of large industrial cooling systems and energy conservation and environmental protection.

The utility model relates to the technical field of cooling towers, in particular to an efficient mechanical draft cooling tower, which solves the problem of low heat exchange efficiency of a mechanical draft cooling tower in the prior art and comprises a shell, a wind power component, a cooling component and a flow guide plate, and the wind power component, the cooling component and the flow guide plate are positioned in the shell. An air outlet, an air inlet, a first through hole and a second through hole are formed in the shell, the wind power assembly is arranged at the air outlet of the shell, the cooling assembly is arranged below the wind power assembly and located at the upper end of the air inlet, and the flow guide plate is arranged at the air outlet of the shell and used for guiding air at the air outlet. The efficient mechanical draft cooling tower provided by the utility model is used for improving the cooling efficiency of the cooling tower.

The utility model relates to the technical field of punching machines, in particular to a mechanical ventilation protective cover punching machine. The utility model provides a mechanical ventilation protective cover punching machine which can adapt to protective covers of different sizes. A mechanical ventilation protective cover punching machine comprises a punching machine body, a support, a square block, a fixing assembly and an adjusting assembly. The front portion of the punching machine body is connected with a support, the upper side of the support is connected with a square block, the front portion of the punching machine body is provided with a fixing assembly used for fixing a ventilation protective cover, and the fixing assembly is provided with an adjusting assembly which is used for adjusting the fixing assembly to adapt to ventilation protective covers of different sizes. A protective cover is placed on the square block, the left clamping plate and the right clamping plate move downwards to press the left side and the right side of the protective cover to be fixed, then punching is conducted through the punching machine body, and under the cooperation effect of the screw and the nut, the positions of the clamping plates can be adjusted leftwards and rightwards to adapt to the protective covers of different sizes.

The invention provides a backwater system cleaning device, a mechanical ventilation cooling tower and a cleaning method. The backwater system cleaning device comprises a water collector, a plurality of backwater modules and a compressed air source, and a plurality of through holes are formed in the bottom of the water collector; each water return module comprises a water leakage pipe, an air guide pipe and a water return port cover, each water leakage pipe is of a cylindrical structure, a first opening and a second opening are formed in the two ends of each water leakage pipe, the multiple water leakage pipes are arranged at the bottom of the water collector, the first openings of the multiple water leakage pipes communicate with the multiple through holes in a one-to-one correspondence mode, and the water return port covers cover the second openings; the side wall of the water leakage pipe is provided with a water return port and an air guide pipe connector, the air guide pipe is provided with an air inlet and an air nozzle, and the air inlet penetrates through the air guide pipe connector to be arranged in the water leakage pipe. The compressed air source is connected with the air spraying opening and used for providing air with preset pressure. According to the technical scheme, the technical problems that in the prior art, water leakage holes are prone to being blocked by pollutants, and the cooling tower is inconvenient to maintain and prone to failure due to manual cleaning are solved.

A ventilation device for mechanically ventilating patients includes an operating device for setting at least one ventilation parameter. The operating device includes a manipulation element that can be manually operated by an operator to manually set the at least one ventilation parameter, and a control unit operable to automatically determine a target value for the at least one ventilation parameter on the basis of detected values of characteristic variables. The operating device is provided with a first haptic feedback unit configured to control the manipulation element in terms of a first haptic feedback to provide perceptible feedback, emphasizing the position of the manipulation element corresponding to the target value determined by the control unit.

The present application relates to a kind of mixed cross flow enhanced condensation mist eliminator, including vane unit in the main flow path of cooling tower, secondary air inlet unit is arranged on the outer side of the side wall of main flow path two sides, vane unit: by several arc vane of interval side by side, arc flow path of wet hot air flow is formed between adjacent arc vane, the top surface of the convex part of arc vane is provided with water hook facing the direction of airflow entering, the surface of arc vane is provided with spoiler rib, the dry cold air flow from the secondary air inlet unit is arranged with 30 °~60 ° oblique angle at the spoiler rib;Secondary air inlet unit: with secondary air inlet and louvre group, secondary air inlet is fixed in the outer part of the side wall of cooling tower, louvre group is located in the interior of secondary air inlet.The present application directly contacts and mixes saturated wet hot air and secondary dry cold air, realizes the function integration of temperature reduction, humidity reduction, water collection in limited space, makes the mist elimination and energy consumption performance of mechanical ventilation cooling tower synchronous promotion.

This invention discloses a variable-direction, double-sided packed, cross-flow mechanical ventilation cooling tower and its control method, relating to the field of heat exchange equipment technology. Based on the tower body as the basic structure, it is equipped with a sensing and monitoring unit, a controller, a power system, double-sided packing groups, a water distribution system, and a water collection system. The sensing and monitoring unit collects packing sensor data from the double-sided packing groups in real time and transmits it to the controller. The controller adjusts the power system's operating state based on this data to form a variable horizontal airflow. Packing groups are correspondingly arranged on the left and right sides of the power system. The top water distribution system supplies hot circulating water to the packing groups, and the bottom water collection system collects and outputs the cooled water. This achieves linkage and adaptation between the airflow direction and the packing conditions, solving the shortcomings of traditional cooling towers where the airflow direction is fixed and cannot be adaptively adjusted according to the packing conditions. The airflow direction can be dynamically adjusted according to the actual operating state of the packing, effectively avoiding heat exchange imbalance caused by local abnormalities in the packing.

The invention discloses a transmission device for assisting a small animal to autonomously breathe hyperpolarized gas, which is characterized in that a sealed breathing mask is used for replacing a trachea cannula, and stable pressure of atmospheric pressure at the breathing mask is used for replacing periodic pressure change under high-pressure forced ventilation at the cannula; the animal spontaneous respiration gas amount is used for replacing the manually set fixed gas amount, and the state of inhaled gas is controlled under spontaneous respiration to replace fully controlled mechanical ventilation in the respiration process; the invention further discloses a method for assisting the small animal in autonomously breathing the hyperpolarized gas, the device can supply the gas amount required by autonomously breathing to the experimental animal according to the self-breathing state of the experimental animal, and the gas amount inhaled by the experimental animal each time is determined by the self-breathing state, so that the experimental animal can autonomously breathe in a free state; lung expansion in an abnormal breathing state can be avoided, so that a more accurate ventilation function and qi-blood exchange function evaluation result is obtained.

The invention relates to a method for measuring the cooling capacity of a mechanical ventilation cooling tower group, which comprises the following steps of: acquiring the measured values of test parameters of the cooling tower group, and calculating the cooling capacity of cooling towers according to a cooling capacity formula; wherein the test parameters of the cooling tower group comprise atmospheric pressure, ambient air dry-bulb temperature, ambient air wet-bulb temperature, cooling tower group inlet air dry-bulb temperature, cooling tower group inlet air relative humidity, cooling tower group inlet water quantity, cooling tower group inlet water temperature, cooling tower group outlet water temperature, cooling tower group outlet air temperature and cooling tower group ventilation quantity. The test parameters of the cooling tower group are collected by taking the cooling tower group as a whole, and then the cooling capacity of the cooling tower group is measured, so that the situation of inaccurate measurement caused by the influence of the tower group effect on a single cooling tower can be avoided, and online real-time monitoring of the cooling capacity of the cooling tower group is realized.

The application relates to the technical field of cooling towers, and discloses a high-efficiency steam-driven mechanical ventilation cooling tower system and method, which comprises a tower body, a liquid conveying pipe fixedly arranged in the interior of the tower body, an impeller rotationally connected to the interior of the tower body, a rotating assembly fixedly arranged on the outer wall of the impeller, the rotating assembly comprising a second umbrella wheel, the outer wall of the second umbrella wheel being rotationally connected to the interior of the tower body, a first runner fixedly connected to the outer wall of the second umbrella wheel, a belt arranged on the outer wall of the first runner, a second runner arranged on the outer wall of the belt, a rotating column fixedly connected to the interior of the second runner, and the two ends of the rotating column being rotationally connected to the interior of the tower body. The fan blades are driven to rotate by the second bevel gear, so that the fan blades can be driven to rotate without a motor and a cable, the problem that the traditional driving mode is prone to electric leakage in a humid environment is solved, and the operation safety is improved.

The application discloses a circulating water intelligent sulfuric acid adding device and a control method thereof, which comprises a sulfuric acid storage tank, a cooling tower pool, a circulating water supplement water pipeline, a circulating water drainage pipeline, an intelligent wind speed, temperature and humidity measuring instrument and a mechanical ventilation cooling tower; the outlet of the sulfuric acid storage tank is communicated with the cooling tower pool, the circulating water supplement water pipeline is communicated with the cooling tower pool, a cooling tower pool liquid level meter is arranged in the cooling tower pool, the bottom outlet of the cooling tower pool is communicated with the circulating water drainage pipeline, the cooling tower pool is located below the mechanical ventilation cooling tower, and the intelligent wind speed, temperature and humidity measuring instrument is arranged at the side of the mechanical ventilation cooling tower. The device and the control method thereof can effectively control the pH and alkalinity of the circulating cooling water in the set value range under the automatic operation state, keep the circulating cooling water quality stable, and ensure the stability of the cooling tower pool liquid level.

A method for reducing the duration of mechanical ventilation in a premature infant at risk for developing bronchopulmonary dysplasia (BPD) includes administering an effective amount of recombinant human surfactant protein D (rhSP-D) to the infant. In further aspects a method for reducing the duration of days in a hospital in a premature infant at risk for developing BPD includes administering an effective amount of rhSP-D to the infant. In certain aspects a method for reducing a probability that a premature infant at risk for developing BPD will develop one or more secondary comorbidities of prematurity includes administering an effective amount of recombinant human surfactant protein D (rhSP-D) to the infant. Pharmaceutical compositions for use in the described methods and uses of a pharmaceutical composition are also described.