5625results about "Ventilation systems" patented technology

The invention relates to the technical field of drying equipment, in particular to a low-consumption constant-temperature dehumidification device and a control method, and achieves an efficient and energy-saving constant-temperature dehumidification effect. The heat recovery module recovers heat in the condensation and regeneration process, the collaborative optimization module coordinates operation of all the modules, the energy utilization efficiency is remarkably improved, and energy consumption is reduced. The control system module dynamically adjusts the state of each module according to the real-time data of the temperature and humidity sensor, ensures the stability of the environment temperature and humidity, and further improves the control precision by adopting a dynamic decoupling control strategy. The regeneration module utilizes recovered heat energy to efficiently regenerate adsorbents and cooperates with novel composite adsorbents, the service life of the adsorbents is prolonged, and the dehumidification performance is improved. The air circulation module forms uniform airflow, and local temperature and humidity unevenness is avoided. A user can set parameters through the interaction unit, the system is controlled to automatically adjust the operation strategy, intelligent operation is achieved, and the system performance is optimized.

The invention discloses an outdoor workstation air quality monitoring and intelligent ventilation system and method, and belongs to the technical field of environment monitoring and intelligent ventilation control. The system is composed of an environment sensing module, an intelligent control unit and a ventilation execution device. And the environment sensing module realizes pollutant concentration field reconstruction through a multi-dimensional data fusion algorithm. The intelligent control unit constructs a dynamic ventilation model based on an improved fuzzy PID algorithm, and generates an optimal ventilation strategy in combination with meteorological prediction data and workstation structure parameters. And the ventilation execution device adopts a modular design to realize directional air supply and pollutant blocking. The method comprises four steps of real-time environment data acquisition, dynamic risk assessment, ventilation parameter optimization and execution mechanism linkage control, and remote intelligent regulation and control are realized through cooperation of edge computing and a cloud platform. According to the scheme, a passive response mode of a traditional ventilation system is broken through, and the technical advantages of accurate pollutant tracing, dynamic optimization of ventilation efficiency and intelligent adjustment of equipment energy consumption are achieved.

The invention provides an industrial air conditioner and waste heat recovery collaborative intelligent optimization control method and related equipment, and is applied to the technical field of data processing. Industrial air conditioner and waste heat recovery system data are fused through the Internet of Things and edge calculation, a standardized parameter sequence is generated through wavelet noise reduction and is converted into an energy flow network atlas, high-energy-consumption working conditions are subdivided through fuzzy clustering, and a dynamic energy efficiency coupling model is constructed. And based on the model, constructing an optimization equation by using an improved particle swarm algorithm, and obtaining the energy consumption of the key node in combination with an energy gradient utilization matrix. And an energy-saving potential coefficient is generated through the multi-dimensional feature matrix, a production plan grouping operation mode is combined, a self-adaptive optimization control model is constructed by using deep reinforcement learning, and finally a real-time regulation and control instruction and an energy efficiency scheme are generated to realize system collaborative optimization.

The invention provides a multifunctional heating ventilation air conditioner waste heat utilization method and system, and the method comprises the following steps: 1, obtaining multi-source data of an air conditioner system and an external heat source, carrying out the preprocessing, carrying out the grading collection and preliminary integration of the multi-source waste heat, and dividing the multi-source waste heat into high-temperature waste heat, medium-temperature waste heat and low-temperature waste heat; multi-source data of an air conditioning system and an external heat source are collected, condensation heat of a compressor, industrial waste heat and other multiple types of waste heat are integrated and subjected to staged treatment, and a high-temperature power generation-medium-temperature heat supply-low-temperature heat storage gradient utilization system is constructed; an LSTM neural network thermal load prediction model and an intelligent algorithm are combined to dynamically adjust a waste heat distribution path so as to realize self-adaptive switching of a refrigeration mode, a heating mode and a hot water mode, and meanwhile, a cascade system, photovoltaic energy, geothermal energy and the like are coupled through a direct-current micro-grid to construct a hybrid energy supply system. The problems that in the prior art, waste heat sources are single, energy efficiency is low due to the fact that gradient utilization is lacked, dynamic regulation and control are insufficient, and cooperation with renewable energy sources is not achieved are sequentially solved.

Ventilation members for venting and / or draining moisture in building structures include a base panel and at least a transversely extending panel. Vent or drain openings are provided through the transverse panel, and a holding clip extends from the transverse panel for holding a drainage mat in place.

The invention discloses an exhaust fan dynamic control method and system based on ventilation and exhaust adjustment, and relates to the technical field of data processing.The method comprises the steps that exhaust fan nodes are obtained, and a main trigger area and an auxiliary trigger area of the ith exhaust fan node are obtained; acquiring a preset time period, acquiring a processing window, acquiring a specified concentration data sequence of the ith exhaust fan node, and acquiring current specified concentration data of the ith exhaust fan node; acquiring an incremental trend value, an auxiliary demand value and a main demand value; if the incremental trend value exceeds a first preset threshold value, obtaining a first control strategy of the ith exhaust fan node according to a main demand value of the ith exhaust fan node; and if the progressive increase trend value does not exceed the first preset threshold value and the correction value exceeds a second preset threshold value, obtaining a second control strategy of the ith exhaust fan node according to the auxiliary demand value of the ith exhaust fan node. The method has the advantages of progressive pre-control, cooperative dynamic control and energy consumption reduction.

The invention relates to the technical field of constant temperature and humidity control, and discloses a multi-effect total heat recovery constant temperature and humidity system. A heat recovery distribution control module of the system analyzes the matching degree of heat recovery efficiency and energy stability and generates a heat recovery distribution control parameter set; the temperature and humidity balance optimization module adjusts the temperature and humidity distribution balance of the cavity and generates a temperature and humidity regulation and control optimization parameter set; the fresh air dynamic regulation module optimizes the fresh air input rate and path distribution and generates a fresh air dynamic regulation result; the abnormal working condition intervention module responds to temperature and humidity fluctuation and generates an abnormal intervention adjustment data set; and the environment parameter optimization module adjusts the target regulation and control path parameters and generates an environment temperature and humidity optimization data table. According to the system, through cooperative work of all the modules, efficient and accurate regulation and control over the environment temperature and humidity are achieved, the stability and adaptability of the system under complex working conditions are improved, and the requirements of modern industrial production and other scenes for high-precision environment control are met.

The invention relates to a liquid air energy storage and terrestrial heat coordinated underground space air regulation and control system and method. Comprising a first-stage compressor, a second-stage compressor, a third-stage compressor, an expansion refrigerator, a first-stage compression heat exchanger, a second-stage compression heat exchanger, a third-stage compression heat exchanger, a cold box, a separator, a liquid air storage tank, a cryogenic pump, an evaporator, a cold storage circulating pump, a cold storage box, a compression heat exchange circulating pump, a compression heat storage box, a first heater, a second heater and a third heater. The system comprises a first air expander, a second air expander, a third air expander and a generator. The regeneration heater is used for guiding the compression heat generated by the compressor into the regeneration heater for regeneration and / or guiding the geothermal energy output by the geothermal energy output end into the regeneration heater for regeneration; the rotary wheel dehumidification device is used for performing cryogenic drying on the wet air; the fresh air processing unit is composed of a fresh air filter, a regeneration fan, a regeneration filter and an air supply fan.

The invention relates to the technical field of building energy saving, and discloses an energy room intelligent control method and system facing the sunlight condition, and the method comprises the steps: obtaining the total solar radiation intensity and scattered radiation intensity through a distributed sensor disposed in an energy room; calculating a sunlight illumination component proportion based on the total solar radiation intensity and the scattered radiation intensity, and determining a sunlight type according to the sunlight illumination component proportion; according to the sunshine type, the influence of sunshine change on the indoor thermal environment is evaluated by adopting a prediction algorithm branch, and the indoor temperature and humidity change trend and the thermal load demand in the future time period are predicted; based on the indoor temperature and humidity change trend and the heat load requirement in the future time period, combined with the heat mass energy storage level of the energy house building, a comprehensive regulation and control instruction matched with the sunlight type is generated; and according to the comprehensive regulation and control instruction, regulating and controlling the heat mass storage and release of the sunshade device, the ventilation system and the building, monitoring the regulation and control effect in real time, and optimizing the prediction algorithm according to the regulation and control effect. And regulation and control of the energy house under the sunlight condition are realized.

A lightweight thermal barrier panel and anchor assembly for installation on a new or existing building envelope is disclosed. The system includes a modular panel with an infill barrier and structural anchors. The anchors are attached to the new or existing building envelope on at least one side of the building envelope to receive the thermal barrier panel to create an air cavity between the panel and the building envelope. The thermal barrier panel framing includes openings within rigid framing members to promote ventilation of the air cavity to the at least one side of the thermal barrier panel.

The invention provides an intelligent control system and method for a natural cooling heat exchange ventilation unit, and relates to the technical field of energy-saving fans. The optimal operation mode and the natural cooling availability of a target ventilation unit are determined firstly; the expected heat exchange amount of the natural cold side is determined according to the current indoor heat load demand characteristics and the natural cold available capacity, and then a static adjusting instruction of a natural cold side actuator is determined according to the expected heat exchange amount; according to the heat load demand characteristics and the expected heat exchange amount, the mechanical refrigeration demand cold capacity is determined, and then a dynamic adjusting instruction of a mechanical refrigeration side actuator is determined according to the heat exchange efficiency and the mechanical refrigeration demand cold capacity of the mechanical refrigeration unit under the current working condition; and performing coordination control on the actuators on the natural cooling side and the mechanical refrigeration side based on the static adjustment instruction and the dynamic adjustment instruction. According to the scheme, dynamic cooperative control over natural cooling and mechanical cooling of the natural cooling heat exchange ventilation unit under the variable working conditions can be achieved, and therefore the energy efficiency is optimized on the premise that the requirement for indoor thermal comfort is met.

The invention relates to the technical field of ventilation and dust removal, in particular to an energy-saving control method and system of a ventilation and dust removal system and a terminal.The method comprises the steps that the current operation condition of the ventilation and dust removal system is recognized through operation state parameters of all dust production devices; on the basis of the current operation condition and the working rhythm of each dust production device, predicting a dust production load change trend in a future time period; generating a header pipe air pressure value of the ventilation and dust removal system according to the dust production load change trend; according to the main pipe air pressure value, the fan operation frequency of the ventilation and dust removal system is adjusted, and the start-stop period of the ventilation and dust removal system is set, so that the technical problems of control response lag and energy waste caused by the fact that the dust production load change trend cannot be predicted by an existing energy-saving control method of the ventilation and dust removal system are effectively solved.

A ventilation system including a ventilator; and an outdoor unit, wherein the ventilator includes a housing including a first intake, a second intake, a first outlet and a second outlet, a plurality of dampers to change flow paths of air flowing through the housing, first and second air blowers, a heat exchanger in the housing, and a processor to control the dampers and first and second air blowers to form a first flow path in which outside air flows through the heat exchanger, or form a second flow path in which room air flows through the heat exchanger, to thereby form a flow path in the ventilator, while air flows through the flow path, control the outdoor unit to form frost on the heat exchanger, and control the outdoor unit to stop operating based on a preset frosting termination condition so that the frost melts to clean the heat exchanger.

The present application relates to the technical field of air conditioners, and particularly relates to an air conditioner control method and device, a multi-connected air conditioner and a storage medium, the present application determines the target heat recovery mode of the multi-connected air conditioner by judging the water tank temperature of the hot water tank, the heating energy demand and the total energy demand of each air conditioner indoor unit obtained when the multi-connected air conditioner simultaneously exists refrigeration and heating water demand, and then adjusts the communication state of the reversing device and the throttling element according to the target heat recovery mode, so as to achieve the purpose of simultaneously operating refrigeration and heating water by one heat pump system, and heat the water tank by the waste heat of air conditioner refrigeration, thereby avoiding the technical problem that the heating and heating water in the prior art multi-connected air conditioner are not simultaneously performed, and improving the use experience of the user.

The invention discloses a local space oxygen enrichment control system and method based on an oxygen selective permeable membrane, belongs to the technical field of air purification, environment control and membrane separation, and aims to solve the problems that the indoor oxygen concentration cannot be actively and efficiently increased and compact integration is difficult in the prior art. The system integrates an outdoor fresh air fan, a switching valve, an oxygen enrichment membrane device, an air pump, an indoor air return and supply fan, a gas monitoring control unit, an outdoor exhaust fan and the like, and a control unit dynamically regulates and controls a switching valve passage, the rotating speed of each fan and start and stop of the air pump according to the difference between oxygen sensor data and preset target oxygen concentration; air selectively passes through the oxygen-enriched membrane device to generate oxygen-enriched air or is fed into a room through a bypass air path, and the indoor oxygen concentration is actively stabilized at 21%-26%. The system is suitable for local spaces such as residences and offices, active oxygen enrichment and environment control can be achieved, the air quality is improved, and meanwhile low energy consumption, safety and comfort are taken into account.

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.

The invention provides a CFD optimization-based air volume matching and linkage control method and system for a smoke prevention and exhaust system of an underground powerhouse, and belongs to the technical field of underground smoke exhaust systems. The method comprises the following steps: performing physical modeling according to an actual underground powerhouse, and performing grid division, solver selection, boundary condition setting and airflow field change simulation to obtain an initial airflow field; cFD is adopted to simulate temperature changes, smoke concentration changes and airflow changes in different fire scenes, wind flow and smoke flow in the underground powerhouse are analyzed, the defects of an existing system are evaluated, and smoke exhaust pipeline arrangement and fan configuration are optimized according to the defects; the airflow change in the fire environment is dynamically calculated by combining the real-time monitoring system and the CFD, and the air volume of the pressurized air supply system, the smoke exhaust system and the air supplement system is adjusted. Efficient linkage of the system is achieved, while personnel evacuation safety is guaranteed, the smoke exhaust efficiency and the emergency response capacity are improved, energy consumption is reduced, and the dual goals of energy saving and efficiency improvement are achieved.

The invention discloses a positive pressure air supply device for a clean room, and relates to the technical field of clean room air supply. By arranging the pretreatment device, when air enters through the air inlet end of the air supply box, the air makes contact with a filter screen arranged in the middle of a connecting plate so as to achieve preliminary filtration and purification, through operation of a motor arranged in an air supply assembly, a rotating shaft can be driven by fan blades so as to increase the air inlet speed, and meanwhile the air inlet speed can be increased. The rotating shaft can further drive a connecting sleeve arranged outside in a sleeving mode to rotate synchronously and drive a scraping plate connected with the rear side to scrape and clean the filtering face of the filtering net and reduce the filtering blocking problem, meanwhile, the rotating shaft can meet linkage driving of the moving assembly, reciprocating movement of a connecting plate is achieved, the contact filtering effect of the spiral filtering net and air is improved, and meanwhile the rotating shaft can be driven by the rotating shaft to rotate synchronously. And the moving assembly can perform reciprocating spraying movement of the spraying assembly, so that entering air is subjected to reciprocating spraying sedimentation by the moving assembly, and the air pretreatment effect is enhanced.

The application relates to a hexagonal air flow plate for an intelligent fresh air system, a processing method thereof and a heat exchange core body, and belongs to the technical field of intelligent fresh air systems. The hexagonal air flow plate for the intelligent fresh air system comprises a hexagonal outer frame and a partition strip in the outer frame, characterized in that the partition strip is in a straight strip shape, and the partition strip is divided into a guide partition strip and a ventilation partition strip; the outer frame comprises two parallel sides and corner sides on the two sides of the parallel sides, the corner sides are four, two corner sides form a group, the corner sides in each group form a right angle, one group of opposite corner sides are provided with air holes, and the other group of opposite corner sides are in a closed structure; the guide partition strip is in a closed structure, air ducts are arranged on the two sides of the guide partition strip, and the two adjacent air ducts are not communicated; the ventilation partition strip is arranged in an angle intersecting with the guide partition strip, and the ventilation partition strip is provided with ventilation holes. The processing method of the hexagonal air flow plate and the core body made of the hexagonal air flow plate are simultaneously provided.

The invention provides an attenuator for ducted air flow systems such as heating, ventilation and air conditioning systems arranged to direct the airflow into the attenuator by reducing the airflow path geometry into a central channel surrounded by absorbing material to damp resonant modes to reduce noise more uniformly across the desired frequency spectrum than resistive attenuators.

The invention relates to the technical field of ventilation control, in particular to a multi-parameter real-time monitoring system of an indoor large ventilation system. The system uses a monitoring data acquisition module to acquire basic monitoring data. Kriging interpolation is carried out by using a spherical semi-variation function according to the collected temperature data to obtain an optimal unbiased estimated value under each coordinate, and an upflow tendency diagram is formed. And segmenting the real-time upflow tendency diagram to determine a plurality of connected domains, evaluating a pollution plume mode index of the current indoor environment by comparing particle concentration data and heat energy data, and further determining a control strategy mode. In each control strategy mode, regulation and control parameters can be determined according to the area of a connected domain or a pixel value in a real-time upflow tendency map. According to the embodiment of the invention, the real-time upflow tendency diagram is constructed through data monitoring and feature analysis, and indoor dynamic, low-disturbance and low-delay ventilation control of a large commercial room is realized.

The present application relates to air conditioning technology field, specifically relates to a kind of partition regulation formula refrigeration constant temperature and humidity air conditioning unit with air supply system, comprising: unit machine case;Constant temperature air supply structure for temperature regulation for air supply system air supply is equipped in the inside of unit machine case, and the air supply end of constant temperature air supply structure is connected with air duct for wind force transmission;The air duct is installed with constant humidity partition regulation structure for indoor partition regulation air supply in air outlet end.This application, in hot air heating mode, system can effectively deliver hot air to each partition by closing No. 1 and No. 3 electromagnetic valve, realize subarea heating, improve energy utilization efficiency, in cold air refrigeration mode, system is adjusted closed flap and starts compressor, so that cold air is delivered to each partition after refrigeration cycle, also realize subarea refrigeration, exhaust air and dust mode can extract indoor peculiar smell and dust, improve indoor air quality.

The utility model relates to the technical field of elevators, in particular to an elevator car ventilation device capable of adjusting ventilation quantity, which comprises a car, a plurality of air outlet holes a which are distributed at equal intervals front and back are arranged on the middle lower portions of the left side and the right side of the inner wall of the car, and a plurality of air outlet holes b which are distributed in a matrix are arranged on the left side and the right side of the inner wall of the car and located above the air outlet holes a. Adjusting assemblies are arranged on the left side and the right side of the inner wall of the lift car correspondingly, each adjusting assembly comprises two L-shaped fixing vertical plates which are symmetrically arranged front and back, a shielding plate is slidably connected between the two L-shaped fixing vertical plates, and the position, close to the middle of the top edge, of the outer side of the shielding plate is in threaded connection with a pressing bolt. According to the elevator car ventilation device capable of adjusting the ventilation quantity, the opening and closing states of the air outlet hole b can be flexibly adjusted through the baffle plate in the adjusting assembly, so that the air flow is controlled, passengers can adjust the ventilation intensity according to actual requirements, and the situation that passengers feel uncomfortable due to large air flow in winter or under other special conditions is avoided.

The invention discloses a method for improving the internal thermal environment of an air film, and the method comprises the steps: measuring the internal dimensions of an air film retaining wall and an air film material shed, selecting a severe stockpiling heating region in an operation region as a treatment region, selecting an air film retaining wall region as an attachment jet flow air supply unit installation position, constructing a middle air supply unit, and constructing a first air port structure. And air port configuration is conducted, the air speed and flow guide of the first air port structure are set, then the middle air supply unit is arranged, and the attached jet flow air supply unit is constructed. By means of the arrangement mode that the middle air supply unit and the attached jet flow air supply unit are matched, the attached jet flow air supply unit forms an air lake through the coanda effect, the middle air supply unit adopts a double air supply mode, and fresh air can be accurately conveyed to the operation areas on the two sides and the middle core area; the short-circuit effect and the top-layer heat island phenomenon of traditional ventilation are broken through, heat accumulation is prevented, the indoor temperature is remarkably reduced, and the overall thermal environment is improved.

The invention discloses an efficient and energy-saving production workshop ventilation system and method, and relates to the technical field of production workshop ventilation, the workshop ventilation system comprises an environment detection module, a quality evaluation module, a ventilation heat exchange module and an energy-saving regulation and control module, the environment detection module comprises an acquisition unit, the acquisition unit is used for acquiring air multi-dimensional detection data in the workshop main body and air temperature outside the workshop main body; the invention also discloses a workshop ventilation method, and the method comprises the steps: obtaining the air quality indexes and the temperature and humidity indexes of different regions in the workshop main body through separately monitoring the different regions of the workshop; and when the air quality index or the temperature and humidity index of a certain area reaches a critical value, an optimal ventilation and heat exchange regulation and control scheme with the highest ventilation and heat exchange efficiency and the least energy consumption is formulated for the area, so that the effect of improving the ventilation and heat exchange response rate and the energy utilization rate is achieved under the condition that the workshop air quality and the environment comfort degree are maintained. And the effects of saving energy and reducing the maintenance cost are achieved.

The invention relates to the technical field of dust prevention and ventilation, and particularly discloses a dust-proof ventilation structure for a clean room, the dust-proof ventilation structure comprises a supporting platform, a filtering structure, an air outlet pipeline, a cutoff structure and a cleaning device, the supporting platform can support the whole device to operate stably; the filtering structure is arranged at the rear end of the top surface of the supporting platform close to the center; the air outlet pipeline is arranged at an air outlet in the bottom of the right end of the filtering structure. The bottom of the filtering structure is fixedly connected with the supporting platform. The cutoff structure is arranged at the front end, close to the center, of the top surface of the supporting platform, the top of the cutoff structure extends into the center of the top of the separated air outlet pipeline, and the cutoff structure can cut off the air outlet pipeline; the cleaning device is arranged at one corner of the left end of the top face of the supporting platform. According to the device, pollution source input is blocked through mechanical cutoff and impurity collection of the cutoff structure, and internal dust sources generated by filter material dust accumulation are reduced through active dust removal of the cleaning device.

The utility model relates to the technical field of underground garage exhaust fans, and particularly discloses a multi-cavity assembly type electromechanical integrated air and smoke exhaust machine room for an underground garage, which comprises a body, an overhaul opening is arranged at the bottom of the body, one side of the overhaul opening is connected with an overhaul door, and one side of the body is provided with a carbon monoxide detector. An indicating lamp is arranged on one side of the body, a connecting frame is arranged at the top of the body, an air inlet is formed in one side of the body, an air inlet cavity is formed in one side of the interior of the body, a fan cavity is formed in the middle of the interior of the body, an air and smoke exhaust fan is arranged in the middle of the fan cavity, an air exhaust cavity is formed in one side of the interior of the body, and an electric cavity is formed in one side of the body. The two ends of the air and smoke exhaust fan are connected with the air inlet cavity and the air exhaust cavity.

This invention provides a fan wall, belonging to the technical field of air conditioning equipment, including a mounting frame, multiple axial flow fans, multiple air supply duct assemblies, and multiple drive devices. Each axial flow fan has four air supply duct assemblies on its outer side. Each air supply duct assembly includes two horizontally arranged ducts. Each drive device drives the outlet of one duct to move obliquely upwards away from the other duct to the rear side of the corresponding axial flow fan, and obliquely downwards away from the other duct to the rear side of the corresponding axial flow fan. The air supply duct assemblies generate and transport high-speed airflow, which is ejected from the outlet of the duct, improving the uniformity of airflow and air circulation speed of the fan wall. When an axial flow fan malfunctions, the drive device drives the outlet of the corresponding duct to move and deflect, blowing high-speed airflow towards the inlet of that axial flow fan. The high-speed airflow is blown out from the outlet of the axial flow fan along the fan's duct, preventing the formation of backflow at the stopped axial flow fan.

The invention discloses a clean storage system for a household breathing machine. The machine body is provided with a breathing machine placing area, a storage device, an air purification system and a display control component, an air outlet is at least formed in the breathing machine placing area or the part, close to the breathing machine placing area, of the machine body, the storage device is provided with a storage chamber, an exhaust port and a storage port capable of being opened and closed, and the storage chamber is communicated with an air supply device. The air purification system is provided with a fan, an air purification device, an air outlet and an air inlet, an airflow channel in the machine body in the air outlet direction of the air purification device is a clean air area, the air outlet communicates with the airflow channel, the breathing machine containing area forms the clean air area, and the air supply device sucks clean air. The household breathing machine platform has a special platform space for placing various types of household breathing machines, has an air source filtering and purifying function, and has the advantages that accessories / parts of the household breathing machines can be cleanly stored, indoor environment air can be purified, and the like.

An off-ridge roof ventilation device for placing on an opening of a roof deck. The ventilation device comprises an elongated main hood with a curved shape. The right end of the main hood is closed by a right-side panel, and the left end of the main hood is closed by a left-side panel. The main hood comprises a perforated top face and a venting opening on a bottom face. A throat panel is placed on the bottom face of the main hood in a manner to reduce the venting opening. A perforated interior panel is placed between the top face of the main hood and the throat panel to eliminate wind driven rain and / or snow even in high wind situations. The perforations are preferably designed as mini-louvers, wherein the mini-louvers of the main hood and the mini-louvers of the throat panel comprise the same shape and count the same number.