51 results about "Assisting ventilation" patented technology

The invention discloses a new energy ventilation and heat exchange device, and relates to the technical field of air conditioning devices.The device comprises a shell, a mounting barrel is fixedly connected to the interior of the shell, and a ventilation and heat exchange mechanism used for extracting high-temperature air in a workshop is arranged in the mounting barrel; an auxiliary mechanism for assisting the ventilation and heat exchange mechanism in extracting high-temperature air is further arranged in the mounting cylinder, air in the workshop can be extracted by changing the distance between a flow guide plate and fan blades and the included angle between a matching plate and the fan blades and rotating the fan blades, the ventilation and heat exchange effects are achieved, and the service life of the workshop is prolonged. And through linkage cooperation of the auxiliary mechanism and the gain mechanism, the heat production rule of'stage work 'of equipment in the workshop is adapted, efficient ventilation of'adjustment as needed' is achieved, the situation that high-temperature air in the workshop cannot be exhausted in time is avoided, and the stability of air adjustment in the workshop can be effectively improved.

A multi-channel air knife comprises a shell, a ventilation cavity is formed in the shell, a main ventilation cavity and an auxiliary ventilation cavity which are not communicated with each other are formed in the ventilation cavity, the main ventilation cavity is a high-speed airflow channel, and the auxiliary ventilation cavity is a low-speed airflow channel; the main ventilation cavity is provided with a main ventilation opening formed in the length direction of the ventilation cavity, and the auxiliary ventilation cavity is provided with a plurality of air uniformizing holes used for air outlet. An air nozzle communicated with the ventilation cavity is arranged at the bottom of the shell; compared with the prior art, through the physical isolation design of the main ventilation cavity and the auxiliary ventilation cavity, independent control over auxiliary uniform flow of high-speed airflow and low-speed airflow is achieved, the airflow speeds of different areas are accurately adjusted, and more flexible wind power distribution is achieved; and the start-stop or the air volume of the two channels of the main ventilation cavity and the auxiliary ventilation cavity is independently controlled according to actual requirements.

Devices and methods for allowing for improved assisted ventilation of a patient. The methods and devices provide a number of benefits over conventional approaches for assisted ventilation. For example, the methods and devices described herein permit blind insertion of a device that can allow ventilation regardless of whether the device is positioned within a trachea or an esophagus. In addition, the methods and device allow for timed delivery of ventilations based on a condition of a thoracic cavity to increase the amount and efficiency of blood flow during a resuscitation procedure.

This utility model discloses a dual-exhaust extended ground-level ventilation system, belonging to the field of ground-level ventilation technology. It includes a building and a ditch located beneath the building. The front wall of the building is equipped with a wet curtain for air intake, and the rear wall is equipped with an exhaust fan for exhausting air outwards. The floor of the building is fitted with a perforated plate connected to the ditch. Exhaust fans for exhausting air outwards are installed at both ends of the ditch. This dual-exhaust extended ground-level ventilation system has the following advantages: dual-end exhaust, suitable for long-distance ditches: avoids the wind speed attenuation of single-end exhaust, making the airflow within the ditch more uniform; complementary double-layer airflow, eliminating ventilation dead zones: the main ventilation of the building covers the upper and middle activity areas, while the auxiliary ventilation of the ditch specifically removes accumulated waste gas from the ground, with superimposed double-pathways eliminating ventilation blind spots.

The invention discloses a laboratory waste gas purification fume cupboard, and belongs to the technical field of fume cups.The laboratory waste gas purification fume cupboard comprises a cabinet, a workbench is installed at the top end of the cabinet, an auxiliary ventilation mechanism is arranged at the top end of the workbench, the auxiliary ventilation mechanism comprises a suction fan fixedly installed at the top end of the workbench, and supporting pipes are arranged on the two sides of the workbench; and the input end of the suction fan communicates with a filtering part for filtering waste gas, a gas collection cylinder is rotationally installed on the surface, close to the interior of the workbench, of the supporting pipe, the suction fan communicates with the interior of the gas collection cylinder through an air inlet assembly, and a gas suction assembly is arranged on the outer surface of the gas collection cylinder. The air inlet amount of the auxiliary air suction assembly can be dynamically adjusted according to the actual air pressure in the cabinet by combining accurate control of the air pressure valve on opening and closing of the ventilation pipeline, so that the air inlet amount is matched with the air draft amount of the fan in real time, the negative pressure value is stabilized in a safe interval, and the waste gas leakage risk is further eradicated.

The utility model discloses a painless endoscopic diagnosis and treatment bite block with jet ventilation and gas sampling functions, and relates to the technical field of medical auxiliary equipment. The painless endoscope diagnosis and treatment instrument solves the problem that the existing painless endoscope diagnosis and treatment instrument does not have auxiliary ventilation and end-expiratory carbon dioxide monitoring functions during endoscope operation. A tongue pressing pad is arranged below a mouth pad, the head end of the tongue pressing pad is fixedly connected with the inner side face of a fixing pad, and a jet ventilation hole channel and two anti-blocking gas sampling hole channels which are arranged in parallel and penetrate through the head end face and the tail end face of the tongue pressing pad are formed in the tongue pressing pad in the longitudinal direction. The two anti-blocking gas sampling hole channels are located on the left side and the right side of the jet ventilation hole channel, and a jet guide pipe connector and two anti-blocking gas sampling connectors which are in one-to-one correspondence with the jet ventilation hole channel and the two anti-blocking gas sampling hole channels and are communicated with the jet ventilation hole channel and the two anti-blocking gas sampling hole channels are formed in the fixing pad. The utility model is used for implementing assisted respiration and end-expiratory carbon dioxide monitoring technology for a patient under the condition of non-airtight airway management.

The invention relates to a building ventilation device for municipal engineering, and belongs to the technical field of building ventilation, the building ventilation device comprises a device main body, the outer wall of the device main body is fixedly connected with an air inlet pipe, the air inlet pipe is internally provided with a suction fan, and one side of the air inlet pipe is fixedly connected with a first conveying pipeline. According to the ventilation device, a sealing baffle is arranged, when the ventilation device assists ventilation of a building, in order to improve the ventilation path switching use effect and reduce the situation that when a filter screen is replaced, the whole ventilation device is in a shutdown state, and the ventilation efficiency of the ventilation device is affected, a first servo motor is started, and a swing rod rotates; and a sliding column is driven to synchronously slide along the inner walls of a limiting groove and a lifting groove, and a sealing baffle is driven to alternately close a first conveying pipeline and a second conveying pipeline, so that the first conveying pipeline and the second conveying pipeline alternately ventilate a ventilation device, and the continuous ventilation efficiency of the ventilation device is improved.

Title of the invention: Monitoring of a patient's intercostal muscle activity during assisted ventilation using a patch sensor. The invention relates to a monitoring system (1) for the respiratory muscle activity of a patient (P), in particular intercostal and / or diaphragmatic muscle activity, comprising a patch sensor (10) including mechanomyography measurement means (13) for performing successive measurements of the patient's muscle activity, and a medical ventilator (20) with control means (25) for processing the measurements performed by the mechanomyography measurement means (13). Display means (30) display an MMG curve (31) representing the patient's muscle activity, in particular intercostal and / or diaphragmatic muscle activity, over time (t) obtained from the processed measurements. Abstract figure: Figure 1

The utility model relates to a prone position body position pad for assisting ventilation of a premature infant, and belongs to the technical field of neonatal nursing tools. In order to solve the problem that an existing prone position pad cannot be used when a premature infant wears a breathing machine, the prone position pad is provided with a pad body part and a protection part, the pad body part is arranged in the protection part, the height of the pad body part is lower than that of the protection part, a face containing groove is formed in the pad body part, and the face containing groove corresponds to the head position of a newborn. The cavity is formed in the middle of the face containing groove, the opening is formed in the portion, corresponding to the cavity, of the protection part, and a pipeline for a newborn to wear the breathing machine extends to the outside through the cavity and the opening, so that the situation that a premature infant tilts towards one side or falls off when wearing the breathing machine is effectively avoided; meanwhile, the problem that breathing is affected due to the fact that a breathing machine presses the nasal septum of the child patient can be solved.

The invention discloses a double-exhaust type trench ventilation system and method based on environment control precision, and belongs to the technical field of trench ventilation. The system comprises a house and a trench arranged below the house; a wet curtain and a house exhaust fan are respectively mounted on the front gable wall and the rear gable wall of the house; a leakage plate is mounted on the ground of the house; trench exhaust fans for exhausting air to the outside of the trench are mounted at the front end and the rear end of the trench; the house exhaust fan and the trench exhaust fan are both electrically connected with the PLC control system, and the rotating speed of the fans is adjusted in real time through the PLC control system. According to the system, through a double-layer structure of house main ventilation and trench auxiliary ventilation, wet curtain air inlet, double-end air exhaust and structural optimization design are combined, and dead-corner-free ventilation in the house and trench long-distance uniform air exhaust are achieved; parameters such as temperature, humidity and waste gas concentration in the house are accurately controlled by combining sensing of multiple sensors and dynamic adjustment of a PLC (Programmable Logic Controller); the problems of ventilation dead angles, low air exhaust efficiency, low intelligent level and inaccurate environment control of a traditional system are solved.

The application discloses a plastic auxiliary ventilation mask for endoscopy and belongs to the technical field of medical devices, which comprises a mask body, an endoscope hole is arranged on the front surface of the mask body, and a plug-in pipe sleeve for inserting an endoscope is connected to the endoscope hole; the bottom of the plug-in pipe sleeve is connected with the mask body in communication, and a one-way valve sleeve is connected to the top of the plug-in pipe sleeve; a blocking air bag capable of being contracted or expanded is arranged in the plug-in pipe sleeve, the blocking air bag can block the gap between the endoscope and the plug-in pipe sleeve, a catheter for controlling the ventilation of the blocking air bag is arranged on the blocking air bag, the catheter is connected with the blocking air bag in communication, and the catheter extends to the outside of the mask body; an oxygen supply pipe and an annular memory sponge are arranged on the mask body. The application can ensure the airtightness during use, and the mask body will not leak air when the endoscope is used for examination.

The utility model discloses a head-mounted hearing aid, and relates to the hearing aid fitting technical field, the head-mounted hearing aid comprises a head-mounted support assembly, the head-mounted support assembly comprises an elastic clamping frame, the center of the surface of the elastic clamping frame is provided with an auxiliary groove, the surface of the elastic clamping frame is provided with an air transmission sleeve, the bottom of the air transmission sleeve is provided with an exhaust hole, and the air transmission sleeve is provided with an air outlet. The left end and the right end of the air conveying sleeve communicate with bending heads, air entraining fans are installed in inner cavities of the bending heads, the inner ring of the elastic clamping frame is fixedly connected with an anti-skid rubber strip, and a through groove is formed in the surface of the anti-skid rubber strip. The beneficial effects of the utility model are that through the arrangement of the head-mounted support assembly, the battery and the small controller, the helmet has the advantage of auxiliary ventilation, and when a person wears the helmet, the small controller can control the air entraining fan to work, so that air flows through the bending head, the air transmission sleeve, the exhaust hole and the through groove, and the purposes of ventilation and heat dissipation are achieved; and the wearing comfort of personnel is effectively improved.

The present invention relates to a ventilation device for a vehicle, which includes a main vent and an auxiliary vent, which are divided by a partition wall and combined in a single duct, a plurality of horizontal vanes installed at a position behind the main vent and the auxiliary vent, and a volume control vane included in the plurality of horizontal vanes for distributing a volume of air discharged to the inside of the vehicle through the main vent and a volume of air discharged to the inside of the vehicle through the auxiliary vent. The ventilation device can ensure an internal exhaust air volume, adjust an air direction, ensure a duct installation space, and redistribute an air leakage volume.

The invention discloses a pediatric patient anesthesia recovery state evaluation device and an evaluation method thereof, and relates to the field of intelligent medical treatment, the device comprises a double-gas-path module, the double-gas-path module comprises a main channel and an auxiliary channel, the main channel is used for collecting exhaled gas, and the auxiliary channel is used for providing low-flow oxygen to assist ventilation; the adjustable nose wing fixing clamp is connected with the double-gas-path module, the adjustable nose wing fixing clamp is used for being attached to the nasal septum of a monitored person, the miniature nasal cavity adaptive sensor module comprises a flexible silica gel substrate, a miniature infrared light source and a light-sensitive detector are integrated on the flexible silica gel substrate, and the miniature infrared light source and the light-sensitive detector are connected with the adjustable nose wing fixing clamp. The micro nasal cavity adaptive sensor module is arranged on the inner wall of the main channel; the airflow sampling module is arranged on the inner wall of the main channel. The invention provides a non-invasive, real-time, intelligent and high-precision solution for a high-risk and low-tolerance scene of postoperative anesthesia recovery of a pediatric patient.

The breathing filter with the temperature and humidity monitoring function comprises a breathing filter shell, an air inlet hole is formed in the bottom of the breathing filter shell, a connecting air pipe is fixedly connected to the interior of the air inlet hole, a supporting rod is fixedly connected to the interior of the breathing filter shell, a first mounting opening is formed in the supporting rod, and a second mounting opening is formed in the second mounting opening. A temperature and humidity sensor is fixedly connected into the first mounting opening and located in the breathing filtering shell. According to the breathing filter with the temperature and humidity monitoring function, when breathing filtering is provided for a patient, gas enters the breathing filtering shell through the connecting gas pipe at the moment, and meanwhile the temperature and humidity of the gas entering the breathing filtering shell are monitored in real time through the temperature and humidity sensor located on the supporting rod in the breathing filtering shell; therefore, the auxiliary ventilation quality of the patient is effectively judged, and clinical diagnosis and treatment activities are more convenient.

The utility model discloses a coal mine well vent pipe which comprises a vent pipe body, the right end of the vent pipe body is fixedly connected with an air inducing assembly, the air inducing assembly comprises a mounting plate, the right side face of the mounting plate is provided with a mounting groove, the inner wall of the mounting groove is provided with fan mounting screw holes which are annularly arranged, and the fan mounting screw holes are fixedly connected with the mounting plate. And two groups of fixing holes are formed in the right side surface of the mounting plate. According to the device, through the arrangement of the ventilation pipeline body, the air inducing assembly, the mounting groove, the fan mounting screw hole, the mounting plate and the fixing hole, fixing of the ventilation pipeline body can be assisted, mounting of an induced draft fan can be facilitated through the mounting groove and the fan mounting screw hole, and mounting operation of the air inducing device of the ventilation pipe is facilitated; and through arrangement of a mounting disc, clamping holes, a filtering assembly, a filtering net frame, a filtering net and a buckle, buckling mounting of the filtering assembly can be achieved, the filtering effect of the ventilation pipeline body is effectively improved, and the ventilation quality of the ventilation pipeline is conveniently guaranteed.

The present application relates to the technical field of water oxygenation, in particular to a water oxygenation system based on natural wind force and a design method, the design method comprising setting up ventilation corridors on both banks of a river section, designing the height, width and length of the ventilation corridors based on environmental basic parameters, verifying and optimizing the design of the ventilation corridors; setting up wind force guiding devices in the ventilation corridors, designing the size of the inclined plates in the wind force guiding devices according to the width and length of the ventilation corridors; setting up a plurality of auxiliary ventilation devices evenly between the banks of the river section, determining the number of the auxiliary ventilation devices according to the length of the river section. The present application guides and accelerates the flow of natural wind to perform oxygenation by setting up ventilation corridors on both banks of the river, fully utilizes the natural wind force resources, greatly reduces the dependence on external energy, avoids the high energy consumption problem caused by traditional mechanical oxygenation and chemical oxygenation, eliminates the potential pollution of chemical agents to the environment, and ensures the sustainability of the environment and the stability of the ecological system.

The utility model discloses auxiliary ventilation curtain wall glass and a glass curtain wall, and relates to the technical field of building structures, the auxiliary ventilation curtain wall glass comprises a mounting window frame, an air outlet assembly, a glass assembly and a control device; the mounting window frame comprises a first window frame and a second window frame which are oppositely arranged in the first direction, and a first mounting groove is formed in the inner side of the first window frame; the air outlet assembly comprises a fan installed on the second window frame. The glass assembly comprises a glass frame and a glass plate, and one side end of the glass frame is hinged to the second window frame; the control device comprises a first switch piece and a second switch piece which are connected to a power supply circuit of the fan in series, and the first switch piece comprises a conduction part installed in the first installation groove through an elastic piece; an abutting part is arranged on one side, corresponding to the first window frame, of the glass frame; according to the technical scheme, an operator is prevented from forgetting to close the fan synchronously when closing the mounting window.

The invention discloses indoor auxiliary ventilation equipment, and belongs to the technical field of air circulation auxiliary equipment. The indoor auxiliary ventilation equipment can be matched with a door body to be detachably installed at a gap of the door body, the fresh air function and the exhaust function are achieved through the fan assembly integrated in the equipment and the corresponding set of ventilation openings, and air in a target room can be purified in the fresh air function state; under the air exhaust function, air in a target room can be exhausted, and indoor air circulation is accelerated. Therefore, the indoor auxiliary ventilation equipment well utilizes specific spaces such as door slots, is installed on a door body without damaging and massively transforming an original building, and is wide in application scene and convenient and fast to install. In addition, through different operation states of the fan assembly, indoor air circulation can be rapidly and effectively accelerated, and the indoor air quality is improved.

A control system for a vehicle vent includes: a main vent located in a cabin and configured to discharge air; the auxiliary ventilation opening is located above the main ventilation opening; and a controller configured to drive the main vent, where the controller is configured to: determine thermal load data generated in the vehicle; adjusting the angle of the main ventilation opening; and adjusting the angle of the auxiliary vent based on the wind direction of the main vent.

The internal structure (22) of a nacelle (18) for a turbine (10), the internal structure being designed to surround at least a part of a chamber that can receive a gas generator (14) of the turbine (10), the internal structure (22) including a ventilation cavity (30) of the chamber, the ventilation cavity (30) being provided with a main ventilation outlet (32) and an auxiliary ventilation outlet (34) separate from the main ventilation outlet (32), the internal structure (22) including a closing member (40) that is movable relative to the ventilation cavity (30) between a flow position and a closed position, in the closed position, the closing member (40) closing the auxiliary ventilation outlet (34) to a greater extent than in the flow position.

The utility model discloses an environment-friendly ultra-low energy consumption curtain wall structure, which comprises a mounting frame, a movable plate is arranged on the front side of the mounting frame, an outer frame is arranged on the front side of the movable plate, a curtain wall panel is arranged on the inner side of the outer frame, a sleeve is bolted on the front side of the mounting frame, an inner side of the sleeve is slidably connected with an inner cylinder, the mounting frame is directly fixed to the outer side of a building, the outer frame is supported by the sleeve and the inner cylinder, and is fixed by connecting bolts, the outer frame is used for installing the curtain wall panel, the movable plate is fitted on the inner side of the outer frame to ensure the sealing of the structure, and the overall beauty of the structure is maintained, when structural ventilation is required, the movable plate can be pushed along the outer frame to be close to the mounting frame and no longer in contact with the outer frame, at this time, the airflow can enter from the gap between the movable plate and the outer frame between the curtain wall panel and the outer wall of the building to achieve the effect of auxiliary ventilation.

The invention relates to the technical field of auxiliary ventilation treatment equipment, and discloses auxiliary ventilation treatment equipment for a prone position patient, which comprises a base provided with a head support part, a neck support part and a chest and abdomen part with an inclined surface, and further comprises a lower body support area formed on the base; windows penetrating through the top surface of the base are formed in the head supporting part, the neck supporting part, the thoracic-abdominal part and the lower body supporting area; a breathable soft cushion, a supporting net, a supporting frame, an air cushion layer and a ventilation pipeline are arranged in each window; air outside the base is conveyed into the base through the air bellow and the ventilation pipeline and is emitted out from the ventilation soft cushion, ventilation airflow can be formed, the good ventilation and perspiration effects are achieved, and discomfort caused by long-time use is relieved; the multi-layer soft treatment pad is formed by the breathable soft pad, the supporting net and the air cushion layer, it is guaranteed that air in the ventilation pipeline can be effectively dissipated, the good pressure sore prevention effect is achieved, and long-time use is facilitated.

The invention belongs to the field of parking garages, and particularly relates to an intelligent temperature control and ventilation linkage device of an energy-saving two-wheeled electric vehicle stereo garage. A first rail groove is formed in the bottom of the garage, a plurality of first bottom plates are slidably connected to the first rail groove, and the first bottom plates can horizontally move on the first rail groove; a first ventilation structure is arranged at the top of the garage; a plurality of lifting assemblies are arranged on the rear transverse column; a third rail groove is formed in the side, facing the first bottom plate, of the lifting column, a second bottom plate is movably connected into the third rail groove, and frame bodies capable of being rotationally opened and closed are symmetrically arranged on the first bottom plate and the second bottom plate correspondingly. A temperature detection component used for detecting the temperature of a vehicle area, a smoke detection component used for detecting smoke of the vehicle area, a fire extinguishing component used for disposing a fire source and a ventilation basic component used for assisting ventilation in the garage are integrated on the frame body, and all the integrated components on the frame body cooperate with the first ventilation structure to conduct ventilation temperature control and safety protection.

The utility model belongs to the technical field of switch cabinets, and particularly relates to a low-voltage switch cabinet, which comprises a cabinet body, a plurality of groups of drawers are arranged on the cabinet body, the plurality of groups of drawers are linearly arranged along the outer side of the cabinet body from top to bottom, a plurality of groups of ventilation holes are arranged in the drawers, and a ventilation part is connected with the cabinet body to assist in ventilation and heat dissipation of the cabinet body. The outer side of the drawer is symmetrically connected with two groups of handles, the outer sides of the handles are coated with anti-skid sleeves, and the outer side of the cabinet body is provided with a plurality of groups of ventilation holes, when the switch cabinet is used by the arranged drawer, the drawer can be pulled out and slide in the cabinet body, and when electric power accessories need to be installed in the switch cabinet, the effect of more convenient replacement can be achieved; meanwhile, the driving motor drives the ventilation fan to work in the ventilation box and convey cold air into the switch cabinet, and the ventilation holes and the air inlets are arranged diagonally, so that the input cold air can enter from the bottom of the cabinet body and is output from the top of the cabinet body, and the ventilation effect is improved.

The invention relates to the technical field of respiratory medicine physiological research, and discloses a respiratory tract deposition distribution testing device and method for an inhalation preparation, the testing device comprises a respiratory tract model unit, the respiratory tract model unit comprises a sealed container, a pulmonary trachea model and a head model, the air inlet end of the pulmonary trachea model extends to the outside of the sealed container, and the air outlet end of the head model extends to the outside of the sealed container; the head model is connected with the air inlet end of the pulmonary trachea model; the breathing machine system comprises a breathing machine, a connecting pipeline and a medicine feeding device, and the end, away from the breathing machine, of the connecting pipeline is connected to the mouth and / or the nose of the head model; and the air bag unit comprises a filtering assembly and an air bag assembly, the filtering assembly is connected with the sealed container, and the air bag assembly comprises an air bag which adaptively expands and contracts when the breathing machine system works. Under the condition that a breathing machine system assists ventilation, the respiratory tract model adapts to the running parameters of the breathing machine, the function of assisting human body breathing of the bionic real breathing machine is achieved, and the deposition result of the bionic drug particles in the respiratory tract is accurately achieved.

The present invention discloses a hybrid ventilation high-level water collection cooling tower, which comprises a tower barrel, tower supports, a water splashing ring plate, a stepped conical hopper water tank and a tower core support; the tower barrel is supported by the tower supports, and the tower core is arranged inside the tower barrel; a water splashing ring plate is arranged at the lower part of the inner wall of the tower barrel; a stepped conical hopper water tank is arranged below the water splashing ring plate, and a water outlet shaft is arranged at the center of the stepped conical hopper water tank; the tower core support passes through the water outlet shaft; the stepped conical hopper water tank comprises a conical hopper water tank, a wind guide well, a water shielding cap and a fan, a plurality of through wind guide wells are arranged on the conical hopper water tank, the fan is arranged in the wind guide well, and the water shielding cap is arranged on the wind guide well. The hybrid cooling tower not only maintains the advantages of the high-level water collection cooling tower, such as energy saving, noise reduction, cold air can reach the center of the tower and can significantly reduce the cavitation of the water pump, but also realizes the automatic and uniform distribution of cold air, and at the same time has the function of the fan to assist ventilation.

Devices and methods for allowing for improved assisted ventilation of a patient. The methods and devices provide a number of benefits over conventional approaches for assisted ventilation. For example, the methods and devices described herein permit blind insertion of a device that can allow ventilation regardless of whether the device is positioned within a trachea or an esophagus. In addition, the methods and device allow for timed delivery of ventilations based on a condition of a thoracic cavity to increase the amount and efficiency of blood flow during a resuscitation procedure.

The present invention belongs to the technical field of tunnel ventilation, and particularly relates to an F-type push-in ventilation system with a three-way variable diameter curved air duct and its use method. The system includes a right tunnel and a left tunnel arranged in parallel, a transverse passage between the right and left tunnels, and a transverse tunnel. A transverse tunnel construction area ventilation module is provided within the transverse tunnel. The module includes a variable frequency axial flow fan II, a flexible air duct II with an F-shaped pipeline structure, a flexible air duct for the left tunnel, a flexible air duct for the transverse passage, and a flexible air duct for the right tunnel. A three-way rigid air duct connection structure is provided at the connection between the flexible air duct II and the soft air duct for the left tunnel, and a curved curved rigid air duct connection structure is provided at the connection between the flexible air duct for the transverse passage and the soft air duct for the right tunnel. The soft air duct for the left tunnel and the soft air duct for the right tunnel, respectively, face the tunnel face II. The present invention utilizes multiple transverse tunnels for auxiliary ventilation and adopts a curved rigid air duct connection structure, which can effectively reduce wind pressure loss, achieve good ventilation effects, and reduce ventilation costs.