14996 results about "Indoor air" patented technology

An air flow system and method are provided which include a duct configured to mount either as an inlet or outlet duct to an electronics rack. When mounted to cover an air-intake side of the electronics rack, a supply air flow plenum is defined for directing conditioned air to the air-intake side. The duct includes a first air inlet at a first end for receiving the conditioned air, and is tapered from the first end to a second end thereof, with the supply plenum having a varying air flow cross-section. The duct further includes a second air inlet for providing supplemental room air to the plenum. The second inlet is disposed adjacent to the first inlet, thereby facilitating mixing of conditioned air with room air within the supply air flow plenum prior to delivery thereof to the air-intake side of the electronics rack.

A nasal cannula, for supplying a respiratory gas to a patient, comprising: a pair of spaced apart supply lines which each have a head at one end thereof with a discharge opening therein. The opposite end of each supply line is connectable to a respiratory gas source. Each head is sized to be snugly received and retained within one of the nasal cavities of the patient while forming a sufficient leakage passage, between a portion of inwardly facing nasal cavity skin of a patient and a portion of an exterior surface of the head, to facilitate exhausting of any excess respiratory gas supplied to the patient through the leakage passage and also facilitate inhalation of any room air required in excess of the respiratory gas to be supplied to the patient. The invention also relates to a respiratory therapy system incorporating the nasal cannula, a method of treating a patient with sleep disorder by using the nasal cannula, a diagnostic tool for measuring nasal cavity pressure of a patient, and a method of using the diagnostic tool for measuring nasal cavity pressure of a patient.

Disclosed herein is a vehicle seat with a cooling / heating device. The vehicle seat comprises electric fans respectively equipped in a lower portion of a seat cushion and a rear portion of a seat back to intake indoor air within the vehicle, cushion members respectively provided in the seat cushion and the seat back and formed with air-supply pathways to supply air induced from the seat cushion and the seat back to an upper portion of the seat cushion and to a front portion of the seat back, air-spreading layers respectively layered on an upper portion of the cushion member provided in the seat cushion and on a front portion of the cushion member provided in the seat back to spread air induced through each of the air-supply pathways, heating pads respectively layered on the air-spreading layers, with a heating line disposed therein, and with a plurality of ventilation holes punctured through each of the heating pads between serpentine sections of the heating line along the heating line, and seat covers respectively layered on the heating pads and having a plurality of air discharge openings formed on the surface of the seat cover.

The invention relates to a high-efficiency multifunctional modular interior air purification device. A device main body is cylindrical and consists of three cylindrical function modules which are combined and include a main l function module, a power control module and an additional function module from bottom top. The main function module with 360-degree omnibearing intake air design consists of a protective hood, a free rotating guide plate, a washable prefiltering glass fiber layer, an attached active carbon adsorption layer, an attached nano active carbon adsorption layer, a high-efficient PTFE filter layer, a load nano TiO2 porous ceramic sequentially from bottom top, as well as a UV lamp in the middle from the outside to the inside; the power control module consists of a power cord, a multifunctional power jack, a fan and a control panel; and the additional function module consists of a cylindrical guide plate, a guide protective hood and a solid essential oil dispersion box / negative ion generator / humidifier and the like. The high-efficiency multifunctional modular interior air purification device is compact in design structure, has no noise pollution, low energy consumption and an obvious purification effect, and is suitable for use in various interior places.

The invention provides a constant-temperature, constant-humidity and constant-cleanliness silent indoor air system, belongs to the field of indoor intelligent adjustment, and relates to multiple techniques including indoor air pressure control, indoor air purification, an indoor central dedusting system, supercharging and compensation functions for interlayers of double windows and double doors, an outdoor haze isolating system, an indoor air internal-circulation cleaning method, air heat exchange, air heating, refrigeration, dehumidification and the like. According to the constant-temperature, constant-humidity and constant-cleanliness silent indoor air system, the pressure of fresh air is made positive through the interlayers of the double doors and the double windows, the air pressure in the interlayers of the double doors and the double windows is made higher than outdoor air pressure, and outdoor air is prevented from invading indoor air; a small primary-efficiency, medium-efficiency and high-efficiency filtering system is used for filtration, various types of automatic adjustment and control including heating, refrigerating, dehumidifying and the like are conducted on air, pollutant dust generated indoors is removed through the central dedusting system, and the constant-temperature, constant-humidity and constant-cleanliness silent indoor air system is an omnidirectional intelligent air control system.

A ceiling paddle fan fixture for improving the quality of the air in the room and various methods of enhancing room air quality, with particular application in public spaces such as hospitals, health care institutions, dormitories, schools and offices. A UV-C source and an air mover are combined in a single fixture which uses a low intensity UV-C source and a paddle ceiling fan to significantly increase the mixing of the treated with the untreated room air. Sterilization of room air is achieved by the passage of a high volume of air at a relatively slow speed through a relatively low intensity UV-C field.

The invention discloses a method for automatic reminding of the cleanness of an air conditioner, which is realized through the following steps: firstly, detecting the running current when an indoor blower of the air conditioner runs; and secondly, comparing the running current with a preset reminding current, if the running current is smaller than or equal to the preset reminding current, a filter screen of the air conditioner can be judged to be dirty or blocked, and an user is reminded. The invention further provides a relevant device for automatic reminding of the cleanness of the air conditioner. The method and the device provided by the utility model for automatic reminding of the cleanness of the air conditioner can exactly reflect the dirty and blocked conditions of the filter screen of the air conditioner and remind the user to clean the filter screen timely, so that the air conditioner can keep sanitary and clean, the indoor air quality can be ensured and the cost is lowered.

The invention relates to interior wall putty powder with air humidity regulating function, which belongs to the field of building materials. The putty powder is composed of 10 to 50 weight portions of humidity regulating material, 15 to 50 weight portions of inorganic binding material, 15 to 50 weight portions of inorganic filler, and 1 to 5 weight portions of sub divisible rubber powder; the humidity regulating material comprises one type or more than one type of diatomite, sepiolite, attapulgite, vermiculite, zeolite powder, kaolin and bentonite. Because of the environment protection and humidity regulating functions, the multi-pore inorganic mineral material is taken as humidity regulating material and applied in the building interior wall putty powder. With water added in, the putty powder is mixed into lacquer putty and applied on the wall surface, which can effectively regulate the indoor air humidity, so that the indoor air humidity is controlled within the scope which is beneficial to the health of human body; meanwhile, the putty powder has no pollution, no VOC released and can be directly used for decoration.

A nasal cannula, for supplying a respiratory gas to a patient, comprising: a pair of spaced apart supply lines which each have a head at one end thereof with a discharge opening therein. The opposite end of each supply line is connectable to a respiratory gas source. Each head is sized to be snugly received and retained within one of the nasal cavities of the patient while forming a sufficient leakage passage, between a portion of inwardly facing nasal cavity skin of a patient and a portion of an exterior surface of the head, to facilitate exhausting of any excess respiratory gas supplied to the patient through the leakage passage and also facilitate inhalation of any room air required in excess of the respiratory gas to be supplied to the patient. The invention also relates to a respiratory therapy system incorporating the nasal cannula, a method of treating a patient with sleep disorder by using the nasal cannula, a diagnostic tool for measuring nasal cavity pressure of a patient, and a method of using the diagnostic tool for measuring nasal cavity pressure of a patient.

The invention relates to an electrospinning nano-fiber electret filtering material and its preparation method. The high-efficiency and low-resistsance nano-fiber electret filtering material having no interfibrous adhesion and having a fluffy three-dimensional netted intercommunication structure is prepared through controlling the component and the temperatures of a polymer solution in an electrospinning process and carrying out one-step forming in the nano-fiber forming rapid cooling process, wherein the gram weight of the above nanofiber layer is 0.01-70g / m<2>, and the porosity is not less than 80%. The surface electrostatic potential of the nano-fiber electret filtering material is 800-6000V, and the surface charges have lasting storage stability, the hydrophobic angle is greater than 150DEG, the filtering efficiency of the material to particles of 0.006-1[mu]m can reach above 99.999%, the piezoresistance is less than 20Pa, and the dust containing capacity is 300-3600g / m<2>. The preparation method is simple, and the filtering material has wide application prospects in the fields of individual protection mouth mask filtration, indoor air purification and filtration, and high efficiency / ultrahigh efficiency air filtration.

Porous-material-supported polymer sorbents and process for removal of undesirable gases such as H2S, COS, CO2, N2O, NO, NO2, SO2, SO3, HCl, HF, HCN, NH3, H2O, C2H5OH, CH3OH, HCHO, CHCl3, CH2Cl2, CH3Cl, CS2, C4H4S, CH3SH, and CH3—S—CH3 from various gas streams such as natural gas, coal / biomass gasification gas, biogas, landfill gas, coal mine gas, ammonia syngas, H2 and oxo-syngas, Fe ore reduction gas, reformate gas, refinery process gases, indoor air, fuel cell anode fuel gas and cathode air are disclosed. The sorbents have numerous advantages such as high breakthrough capacity, high sorption / desorption rates, little or no corrosive effect and are easily regenerated. The sorbents may be prepared by loading H2S—, COS—, CO2—, N2O, NO—, NO2—, SO2—, SO3—, HCl—, HF—, HCN—, NH3—, H2O—, C2H5OH—, CH3OH—, HCHO—, CHCl3—, CH2Cl2—, CH3Cl—, CS2—, C4H4S—, CH3SH—, CH3—S—CH3-philic polymer(s) or mixtures thereof, as well as any one or more of H2S—, COS—, CO2—, N2O, NO—, NO2—, SO2—, SO3—, HCl—, HF—, HCN—, NH3—, H2O—, C2H5OH—, CH3OH—, HCHO—, CHCl3—, CH2Cl2—, CH3Cl—, CS2—, C4H4S—, CH3SH—, CH3—S—CH3-philic compound(s) or mixtures thereof on to porous materials such as mesoporous, microporous or macroporous materials. The sorbents may be employed in processes such as one-stage and multi-stage processes to remove and recover H2S, COS, CO2, N2O, NO, NO2, SO2, SO3, HCl, HF, HCN, NH3, H2O, C2H5OH, CH3OH, HCHO, CHCl3, CH2Cl2, CH3Cl, CS2, C4H4S, CH3SH and CH3—S—CH3 from gas streams by use of, such as, fixed-bed sorbers, fluidized-bed sorbers, moving-bed sorbers, and rotating-bed sorbers.

A filter module for use with a room air-purifying system. The filter module includes a housing and a filter. The housing forms an air inlet, a first outlet port and a second outlet port. The outlet ports are configured for fluid connection to commercial ductwork. The filter is maintained by the housing and is configured to retain air-borne contaminants. During use, airflow passes from the filter to the outlet ports. By incorporating at least two outlet ports, the filter module preferably assumes a low-profile configuration, thereby facilitating installation of the filter module at any desired location relative to a room of interest.

The invention relates to an indoor decorative material, in particular to a diatom internal wall coating with humidity-regulating and air-purifying functions and a preparation process thereof, and aims at overcoming the defects existing in the prior art and providing the diatom internal wall coating and the preparation process thereof, wherein the diatom internal wall coating has an excellent indoor air humidity-regulating function, can eliminate peculiar smell, preserve heat, reduce noise, remove harmful gases including formaldehyde, toluene and the like in the air, can continuously release negative oxygen ions, has a lasting environmental-protection function, a humidity-regulating function and the air-purifying function, and is rich in colors, strong in texture and environment-friendly. The diatom internal wall coating with the humidity-regulating and air-purifying functions and the preparation process of the diatom internal wall coating have the advantages that ingredients can be used after screened, weighed, evenly mixed in a grading mode, checked out and packaged. When the diatom internal wall coating is used, water is added into the coating to prepare a pasty or milky coating, and texture shape construction can be performed in a batch-coating, blade-coating or wipe-coating mode or in a roll-coating, spraying or brush-coating mode. An appropriate construction process can be selected according to the decorative requirements.

The Reduced Oxygen Breathing Device (ROBD2) is an apparatus that dilutes the oxygen present in air to concentrations below 21% by mixing the air with nitrogen. The purpose of this dilution is to simulate the reduced oxygen concentration available as one ascends in altitude. The ROBD2 is unique and different from previous devices that reduce the concentration of oxygen in room air via dilution with nitrogen gas in that it uses sophisticated gas regulating devices known as mass flow controllers. The ROBD also employs a gas extraction device as an independent component of the system that can separate nitrogen gas from air for use in the device.

The invention discloses an ion wind indoor unit, an ion wind air conditioner system and a control method, and relates to the technical field of refrigerating and heating equipment. In order to solve the problems that an existing air conditioner indoor unit is large in occupation size, large in noise and the like, the ion wind indoor unit is designed. The ion wind indoor unit comprises a shell and an indoor heat exchanger arranged in the shell; an ion wind generator is arranged on the upwind side and / or downwind side of the indoor heat exchanger, and carries out corona on air entering the interior of the generator to generate ion wind and blow out the iron wind so as to achieve convection heat exchange of indoor air; and meanwhile, the ion wind air conditioner system with the ion wind indoor unit and the control method of the air conditioner system are provided. The ion wind indoor unit can reduce the starting noise of air and eliminate electromagnetic noise of a motor and vibration noise of a structural part; use comfort is greatly improved; and meanwhile, the indoor unit structure is simplified, the occupied size of the indoor unit is reduced, the attractiveness of the indoor unit is improved, and the production cost and the assembling cost are reduced.

This invention relates to a supported nanometer gold catalyst which is used for cleaning formaldehyde of room air, in addition to its preparing method. The method comprises the following steps: a) using cordierite honeycomb ceramics as the carrier; b) coating a layer of rare earth oxide or composite rare earth oxide in the carrier surface evenly; c) depositing 3-10nm golden grain in the rare earth oxide or composite rare earth oxide, wherein the weight of gold is 1%-3% of the coating. Said catalyst can clean the formaldehyde of the air and the formaldehyde has a high conversion ratio. Meanwhile, the catalytic activity of said catalyst is larger by a magnitude order compared with Mn, Co oxide or rare earth composite oxide catalyst.

The invention relates to adhesive for collecting formaldehyde and paint for collecting the formaldehyde, both of which use formaldehyde collecting agent as a composition of active components. The adhesive is used for adhesion of the outmost layer in a man-made board or adhesion and edge sealing at a kerf of the man-made board, can effectively absorb formaldehyde released by the man-made board, does not cause influence on the adhesive strength of the board, and is comparatively cheap. The paint is used for painting indoor walls, absorbs the formaldehyde in the indoor air, can also be used for painting the surface of the man-made board, seals and absorbs formaldehyde gas, and reduces the release amount of the formaldehyde. Compared with the prior art, the adhesive and the paint for collecting the formaldehyde have the advantages that the adhesive and the paint are cheap, can efficiently adsorb the formaldehyde and generate stable compounds, and do not re-decompose and release the formaldehyde, so the adhesive and the paint cannot generate other secondary pollutants.

An air conditioning apparatus is provided. The air conditioning apparatus includes a cover assembly having an indoor air suction hole, a filter assembly cleaning indoor air sucked through the indoor air suction hole, and a grill. The grill includes a discharge grill formed on a side for discharging the indoor air cleaned by the filter assembly to an indoor area, and an exhaust grill for discharging indoor air to an outdoor area. A fan assembly draws indoor or outdoor air toward the grill. A rear panel is coupled to the grill. The rear panel includes a suction hole formed in one side for introducing outdoor air and an exhaust hole formed beside the suction hole for discharging indoor air to the outdoor area.

The invention discloses a system for intelligently controlling an indoor environment based on thermal imaging technology, which comprises a thermal imaging sensor, a human-computer interaction interface device and an area controller, wherein the thermal imaging sensor acquires thermal imaging data of the indoor environment and identifies and analyzes the thermal imaging data so as to calculate a subjective radiation temperature; and the area controller adjusts the refrigerating and heating capacities at the tail end of an indoor air conditioner according to the subjective radiation temperature and the temperature set by the human-computer interaction interface device so as to perform optimized control on the indoor environment to achieve a temperature comfortable for indoor personnel. The system and a method for intelligently controlling the indoor environment based on the thermal imaging technology can adjust the temperature of the indoor environment, improve the personnel comfort level and work efficiency, reduce the energy consumption and improve the management level of an automatic control system of a building under the condition of acquiring comprehensive environment and personnel information.

The invention discloses a self-cleaning control method for an air conditioner. The self-cleaning control method includes the steps that the self-cleaning function is started; the real-time indoor unit coiled pipe temperature and the real-time indoor air humidity are continuously obtained, and the real-time frosting time and the real-time defrosting time which correspond to the real-time indoor air humidity are obtained; the indoor unit frosting control process is executed; timekeeping is started when the real-time indoor unit coiled pipe temperature is lowered to the first set coiled pipe temperature, and the time is used as the first timekeeping time; in the process of executing frosting control, if the real-time indoor unit coiled pipe temperature is larger than the second set coiled pipe temperature and the first timekeeping time reaches the real-time frosting time, the frosting control process is stopped and switched to the indoor unit defrosting control process; and in the process of executing defrosting control, if the real-time indoor unit coiled pipe temperature is small than the third set coiled pipe temperature and the defrosting time reaches the real-time defrosting time, the defrosting control process is stopped. By applying the self-cleaning control method, precise control over air conditioner self-cleaning is achieved.

The invention provides sustained-release chlorine dioxide gel comprising the following components by weight percent: 0.1% to 5.0% of chlorine dioxide precursor, 1.0% to 10.0% of gel, 0.01% to 2.0% of chelating agent, 0.1% to 10.0% of inclusion agent, 30% to 70% of activating agent, 0.1% to 5.0% of sustained-release agent, 0.1% to 5.0% of stabilizing agent and deionized water in balancing amount. The sustained-release chlorine dioxide gel of the invention is capable of conducting the stable sustained-release process at a certain rate for 3 to 6 months, so the sustained-release chlorine dioxidegel has the advantages of long release period, uniform and stable release rate and lasting effect; the sustained-release chlorine dioxide gel is capable of not only removing formaldehyde from indoor air in an effective, safe and lasting way and ensuring the high removal rate of formaldehyde, but also disinfecting and sterilizing the indoor air continuously and thoroughly purifying the indoor air;moreover, the invention dispenses with high-purity chlorine dioxide gas and further has the advantages of simple preparation method and convenient operation.

A cogeneration system is disclosed which includes a generator, a drive source for driving the generator, a waste heat supplying heat exchanger for enhancing the heating performance of a heat pump type air conditioner, an auxiliary heating heat exchanger using the waste heat of the drive source as a heat source for heating indoor air, and a regeneration heat supplying heat exchanger using the waste heat of the drive source as a heat source for regenerating a dehumidifier. The cogeneration system can use the waste heat of the drive source for diverse purposes in accordance with the indoor environment, and can have a maximal efficiency.

The invention provides an electric oven and an oil fume odor purification device control method. The electric oven comprises a cavity and an oil fume odor purification device which comprises a draughtfan and a filter screen used for filtering oil fume and odor, an exhaust port is formed in the cavity wall of the cavity, the filter screen is installed at the exhaust port, and the draught fan is installed near the filter screen and used for discharging the oil fume in the cavity out of the cavity from the exhaust port and makes the oil fume flow through the filter screen. According to the screen, the oil fume odor purification device of the electric oven comprises the draught fan and the filter screen, the filter screen is installed at the exhaust port of the cavity, in the food heating process of the electric oven, the draught fan works to make gas in the cavity pass through the exhaust port and the filter screen, the filter screen filters out the oil fume and odor in the gas, and filtered gas enters a room and cannot pollute indoor air, so that bad feeling cannot be brought to a user, and the degree of satisfaction of the user on products can be improved.

The invention discloses a thermostat dehumidification control method of an air conditioner. The air conditioner comprises a compressor, a condenser, an electronic expansion valve, an evaporator, a four-way reversing valve, an outdoor fan, an indoor fan, an indoor temperature sensor, an indoor humidity sensor and an outdoor temperature sensor; and the evaporator is divided into a heating section and a dehumidifying section by a dehumidifying electromagnetic valve. The dehumidifying operating mode of the air conditioner is divided into a cold room dehumidification control mode and a thermostat dehumidification control mode according to the difference between the temperature detected by the indoor temperature sensor and the temperature set by a remote controller. When the air conditioner is in the thermostat dehumidification control mode, the thermostat dehumidification control mode is further subdivided into three control areas according to the relative humidity detected by the indoor temperature sensor, thus the purposes of reducing the indoor temperature and keeping the temperature constant are achieved by controlling the frequency of the compressor, the rotation speed of the outdoor fan and various valves, and a conformable indoor environment is provided for the user.

A multipurpose aerosol medication delivery apparatus that includes a collapsible / expandable, or a fixed volume, or a combination of partially fixed volume and partially collapsible / expandable holding chamber for use with a metered dosed inhaler (MDI) and / or any standard small volume nebulizer. The holding chamber is designed to deliver-aerosol medication particles generated by an MDI; aerosol medication particles generated by a nebulizer; a single gas or a mixture of gases; a single gas or a mixture of gases that can yield a gas density that will enhance aerosol delivery of medication with both MDI and nebulizer; a single gas or a mixture of gases that will yield and deliver an oxygen concentration to a patient ranging from room air concentration to 100%. The device includes a reservoir that stores nebulized aerosol generated during exhalation to be inhaled during the next breath. The device also included a one way valve to prevent carbon dioxide generated during exhalation from rebreathing by not allowing the exhaled air from entering the holding chamber. The device includes an exit port with a second one way valve that allows the exhaled air to exit the device but closes during inhalation to prevent any entrainment of room air gas. The exit port may instead have a filter with one-way valve to trap the exhaled aerosol particles while allowing the exhaled gases to escape. The filter valve will similarly close during inhalation to prevent entrainment of room air gas. The holding chamber will allow a uniform mixture of aerosol medication and gases to flow together during inhalation to the patient via a mouthpiece or a facemask. The holding chamber is connected to a nebulizer chamber with a single or multiple connecting tubes that allow gas mixtures with varying density, viscosity, humidity and concentration of oxygen to flow into the holding chamber from the nebulizer chamber. The pattern of flow of the gas(es) does not disturb the flow of the nebulized medication from the nebulizer chamber to the holding chamber or interfere with the plume generated by an MDI. The device also serves as a facemask for delivering precise concentrations of oxygen or as a 100% non-rebreather mask. The device also serves to deliver precise concentrations of different density gases i.e. nitrogen, helium, oxygen, etc. This will allow varying fractions of inspired oxygen to deliver aerosol medication via MDI or a nebulizer. Thus, the device has the ability to deliver aerosol medication with an MDI or a nebulizer while retaining the ability to simultaneously deliver different density gas mixtures and varying fraction of inspired oxygen without interrupting one for the other.

A diagnostic monitoring system and method is employed for one or more vapor compression systems such as air conditioners and heat pumps having a compressor, an indoor air handler fan coil and an outdoor condensor. Temperature, voltage and current sensors are provided at the outdoor condensor to determine that at least one vapor compression system is operating properly. Data obtained from the sensors is wirelessly transmitted to a receiving-device for use by the systems' custodian or repair service provider and includes information concerning an occurrence of periods when one or more of the vapor compression systems are operating at an abnormal state.

The present invention harvests and utilizes fluidized bed drying technology and waste heat streams augmented by other available heat sources to dry feedstock or fuel. This method is useful in many industries, including coal-fired power plants. Coal is dried using the present invention before it goes to coal pulverizers and on to the furnace / boiler arrangement. Coal can be intercepted on current coal feed systems ahead of the pulverizers. Drying fuel, such as coal, is done to improve boiler efficiency and reduce emissions. A two-stage bed utilized in the process first “pre-dries and separates” the feed stream into desirable and undesirable feedstock. Then, it incrementally dries and segregates fluidizable and non-fluidizable material from the product stream. This is all completed in a low-temperature, open-air system. Elevation of fan room air temperature is also accomplished using waste heat, thereby making available to the plant system higher temperature media to enhance the feedstock drying process.

The invention provides an automatic indoor humidity adjusting coating, which comprises the following components in parts by weight: 15-40 parts of emulsion, 0-5 parts of inorganic filming substance, 0.4-1 part of coupling agent, 2-5 parts of propylene glycol, 0.2-0.5 part of dispersing agent, 0.3-0.8 part of anti-foaming agent, 15-20 parts of pigment and filler, 5-10 parts of photo-catalytic powder, 5-20 parts of humidity adjusting material and 0.5-1 part of flatting agent. Any artificial energy is not required to be consumed; the indoor air humidity can be automatically adjusted; chemical reaction can be performed on reactant of visible light by using the photo-catalytic powder, so that surrounding oxygen and water molecules are excited into OH- and O- free negative ions with extremely high oxidation capacity; sterilization and mildew prevention effects are achieved through strong oxidation of the coating; and the coating is environmentally-friendly, nontoxic and energy-saving, and has long effective service time and obvious economical benefit and social benefit.

The invention discloses a loaded reduced precious metal catalyst. The active component of the catalyst is one or more selected of reduced precious metal platinum, palladium, gold and silver, the active component accounts for 0.01-10% of the total weight of the catalyst, and the loaded reduced precious metal catalyst is prepared by adopting a low-temperature liquid phase reduction method. The invention also discloses a preparation method and application of the loaded reduced precious metal catalyst. The loaded reduced precious metal catalyst has high efficiency for removing formaldehyde in theair and can be widely applied to purification of formaldehyde in an industrial process and indoor air. The loaded reduced precious metal catalyst disclosed by the invention also has the advantages ofgood stability, simple preparation process, mild preparation and reaction conditions, low precious metal content, low use cost and the like.

The invention discloses a cabinet-type constant temperature and constant cleanliness fresh air purifying system. The fresh air purifying system comprises an indoor cabinet-type air-conditioner. The indoor cabinet-type air-conditioner is internally provided with an air adjusting unit and a fresh air purifying unit. The indoor cabinet-type constant temperature and constant cleanliness fresh air purifying system is sequentially provided with an air outlet, a heat exchanger, an air conditioning fan and a fresh air purifier from top to bottom. The indoor cabinet-type air-conditioner is provided with an indoor air inlet and an outdoor air inlet. The outdoor air inlet can independently correspond to the fresh air purifier to lead in and purify outdoor air and then exhaust the air indoors while the indoor cabinet-type air-conditioner completes cooling and heating of indoor gas. The cabinet-type constant temperature and constant cleanliness fresh air purifying system is convenient to use, the requirements of indoor refrigerating, heating and indoor air purification can be met at the same time, and meanwhile the fresh air function can be achieved; and purifying efficiency is high, the fresh air purifying system is suitable for indoor multi-space and large-area air purification, and due to arrangement of the fresh air system, the indoor air constant temperature and constant cleanliness and freshness in the long-term purifying process indoors can be kept.