5859results about "Noise suppression" patented technology

A noise reduction hood for attenuating the acoustic noise of cooling fans emanating from an electronic enclosure. The hood is comprised of a base that is constructed and arranged to be supported on the enclosure. The base has an air duct that is adapted to pass air therethrough in a first direction, and includes at least one noise reduction panel disposed in the air duct to attenuate acoustic noise emanating from the enclosure. In one embodiment, the noise reduction panel divides the air duct into a plurality of acoustical flow passages extending through the base. In another embodiment, the hood includes a cover, which may be detachable, that is adapted to divert the air from the first direction to a second direction. In a further embodiment, the hood includes a rim extending from the base for surrounding a portion of the enclosure to secure the hood to the enclosure. The hood may include a plurality of interlocking panels that are arranged in a grid pattern to form an array of acoustical flow passages.

The invention discloses an expansive type silencer and a fresh air system and relates to the technical field of indoor ventilating and exhausting equipment. The expansive type silencer and the fresh air system are invented for solving the problem that an existing expansive type silencer cannot be used for achieving broadband sound eliminating. The expansive type silencer comprises an expansion pipe. Connecting nozzles are arranged at the two ends of the expansion pipe. The area of the sections of the connecting nozzles is smaller than the area of the section of the expansion pipe. The expansion pipe comprises a fixed pipe section and a telescopic pipe section. The end, close to the fixed pipe section, of the telescopic pipe section is matched and connected with the fixed pipe section in a sleeving manner and can slide in the length direction of the fixed pipe section to adjust the length of the expansion pipe. The expansive type silencer is used for the fresh air system.

An active noise control (ANC) system may be implemented to both sides of a fan, such that both directions of the noise emitting are treated to reduce the overall noise. The impact on airflow is minimal, and the technique is very effective in a broad range of low frequencies. Passive sound-absorbing materials may be included for attenuation of high frequencies. The resulting quiet fan produces a low level of noise compared to any other device based on fan, which produces the same capacity of airflow. The quiet fan may be incorporated in any mechanical system which requires airflow induction such as: computers, air conditioners, machines, and more.

The invention relates to an intelligent air purification control system and method. No intelligent air purification control systems and methods with complete functions exist at present. The intelligent air purification control system comprises an air purification system, a fan system and a shell. The intelligent air purification control system is characterized by further comprising an air monitoring system, an android control system, a speed governor module, a loudspeaker, a display system, a network function module and a server. A TVOC sensor, an infrared sensor, an MIC sensor and an optical sensor are arranged in the air monitoring system. An APP extension module, a WIFI module and a data analysis module are arranged in the android control system, and the air monitoring system, the network function module, the display system, the loudspeaker, the server, the fan system and the speed governor module are connected with the android control system. The intelligent air purification control method is characterized by comprising an automatic mode, a sleep mode, a protection mode, a fierce wind mode and a manual mode. The intelligent air purification control system is reasonable in structure and complete in function.

The present disclosure relates generally to duct liner insulation products for curvilinear ducts, and more specifically relates to methods and materials to universally fit duct liner insulation for lining oval ducts in air conditioning, heating, and ventilating (HVAC) systems. A duct liner insulation for a curvilinear duct is provided that includes an insulation layer configured to line an interior surface of a curvilinear duct when installed within the curvilinear duct. The duct liner insulation also includes an elastically deformable layer configured to compress the insulation layer against the interior surface of the curvilinear duct when installed within the curvilinear duct such that the insulation layer extends substantially uniformly around an inner periphery of the curvilinear duct.

A whole house fan system and installation methods configured to reduce noise generated by the fan are provided. The system generally includes a fan, a register, and a flexible duct extending between the fan and the register. The flexible duct has acoustical insulation properties, which helps to reduce sound transmission from the fan to the register. The fan system is configured to be mounted in the attic space of a house. The fan motor is suspended in the attic so that it does not have direct contact with any part of the building structure.

A sound attenuating cover is adapted for intimate fitment to a compressor of a domestic air conditioner, and comprises an outer sleeve member and a generally circular top member which is releasably secured to the outer sleeve member. Hook and loop fasteners secure a first end of the outer sleeve member to a portion of the outer periphery of the sleeve member. When the closure member secures the top member to the outer sleeve member, and the hook and loop fasteners are secured, a cylindrical cover having a closed top end is formed having a diameter adapted for intimate fitment to a compressor of a domestic air conditioner. Each of the outer sleeve member and the circular top member comprises inner and outer cover sheeting material, and at least one layer of sound attenuating material which is typically glass fiber together with barium loaded vinyl.

In order to improve the heat-conducting connection between a contact element (3) and a ceiling panel (1) which are adhesively bonded to one another, the contact panel (5) of the contact element (3) is provided with an adhesive depression (10) in the contact surface (6), said depression taking up only part of said contact surface, while the remaining part of the latter rests directly against the upper side of the ceiling panel (1). The contact panel (5) may be elastically or plastically deformable, e.g. along a bending groove (9), with the result that it adapts more easily to irregularities, such as those caused, for example, by slight sagging of the ceiling panel (1). This permits larger widths of the contact panel (5) without impairing the thermal contact. In order to ensure close abutment of the parts of the contact surface (6) which are not adhesively bonded to the upper side of the ceiling panel (1), the contact panel (5) can be appropriately prestressed.

The invention discloses a method for controlling a mobile air conditioner. The method comprises the following steps that when the mobile air conditioner is started up and operates in a refrigeration mode, the initial indoor environment temperature t0 and the target indoor environment temperature tset are obtained; the temperature interval between the initial indoor environment temperature t0 and the target indoor environment temperature tset is divided into N+1 temperature grades; and the operating rotation speeds of an indoor fan, an outdoor fan and a splash motor are adjusted according to the temperature grade where the indoor environment temperature T is located, specifically, N is a positive integer. The invention further discloses a device for controlling the mobile air conditioner. Since the operating rotation speeds of the indoor fan, the outdoor fan and the splash motor are adjusted according to the temperature grade where the indoor environment temperature T is located, the electric power consumption is reduced, and operating noise of the mobile air conditioner is lowered.

The invention discloses a variable-frequency air conditioner control device and method and a variable-frequency air conditioner. The device comprises a setting module which is used for receiving the frequency adjusting speed and time range inputted by a user, a detecting and judging module which is used for obtaining the current time when the frequency of a compressor needs to be adjusted and judging whether the current time is within the time range or not, and a control module which is used for driving the compressor to increase / decrease the frequency at the frequency adjusting speed inputted by the user when the current time is within the time range, wherein the frequency adjusting speed is smaller than the reference frequency adjusting speed of the variable-frequency air conditioner. By means of the device, noise produced by the air conditioner in the frequency adjusting process is lowered, the requirements of some users sensitive to noise are met, and the interference which is caused by small noise to users in the rest stage particularly at the quiet night is reduced.

A fan array fan section in air-handling system includes a plurality of fan units arranged in a fan array. Each fan unit is positioned within a fan unit chamber / cell. Each fan unit chamber / cell has at least one acoustically absorptive insulation surface. The insulation surfaces of the fan unit chamber / cells together form a coplanar silencer. Sound waves from the fan units passing through the insulation surface at least partially dissipate as they pass therethrough. In one preferred embodiments the fan unit chamber / cell is a cell having a frame that supports the insulation surface.

A fan array fan section in an air-handling system includes a plurality of fan units arranged in a fan array. Each fan unit is positioned within a fan unit chamber / cell. Each fan unit chamber / cell has at least one acoustically absorptive insulation surface. The insulation surfaces of the fan unit chambers / cells together form a coplanar silencer. Sound waves from the fan units passing through the insulation surface at least partially dissipate as they pass therethrough. In one preferred embodiments the fan unit chamber / cell is a cell having a frame that supports the insulation surfaces.

The invention discloses a noise reduction control method for a VRV (Varied Refrigerant Volume) system. The VRV system comprises an outdoor unit and a plurality of indoor units, wherein every indoor unit comprises an indoor heat exchanger and an electric expansion valve. The noise reduction control method comprises the following steps of obtaining the condensate depression of the indoor units which are in stand by states; controlling the opening of the electric expansion valves which are corresponding to the indoor units which are in the stand by states according to the condensate depression of the indoor units which are in the stand by states to reduce the noise of the indoor units which are in the stand by states. The VRV system can reduce the noise of the standby indoor units and improves the user experience during heating. The invention also discloses a VRF system.

Mobile soundproof enclosure with changeable internal room shape and optional ventillation noise cancelling device consisting of a frame that can be assembled and disassembled by a single person without using tools and that in disassembled state is small enough to fit in a trunk of a car; a cover made with flexible sound absorbent sheet material creating completely enclosed room with double walls with air space in between, corner sound traps made with flexible sound absorptive sheet material that can be individually positioned to change internal shape of the room and an air vent noise cancelling device made with flexible sound absorbing sheet material having inlet portion, which enters a center portion at an angle, the center portion larger than the inlet portion and outlet portion which exits the center portion at an angle; the whole enclosure can be disassembled to compactly fold for easy storage or transportation.

The invention discloses a control method of a room air conditioner. The method comprises the following steps that a silent mode of the air conditioner is started; the practical environment noise of a located room of the air conditioner is detected; the target noise during the operation of the air conditioner is regulated according to the practical environment noise, wherein the practical environment noise is greater than the target noise. The control method of the room air conditioner has the advantages that the work capability and the noise of the air conditioner are considered, higher refrigeration / heating efficiency is realized, and meanwhile, the noise disturbing on users is avoided. The invention also provides a control system of the room air conditioner and an air conditioner.

PCT No. PCT / SG97 / 00040 Sec. 371 Date Jan. 30, 1998 Sec. 102(e) Date Jan. 30, 1998 PCT Filed Sep. 3, 1997A system of geometric guides and baffles is used for directing and diffusing external air drawn from a fan blower before distributing the flow evenly to the outlet of a fan filter unit. This arrangement not only reduces the turbulence within a fan filter unit but also maintains the particle count of air drawn through the same system. Furthermore, the present invention is implemented in dimensions substantially similar to that of the fan blower. As such, the present invention minimizes noise of a fan filter unit even in confined clean room facility.

Disclosed is air conditioner having an indoor part and an outdoor part as one unit. The air conditioner including: an indoor part for inhaling an indoor air to exchange heat with the inhaled air through an indoor heat exchanger, and again discharging the heat-exchanged air into an indoor space; an outdoor part for inhaling an outdoor air to exchange heat with the inhaled air through an outdoor heat exchanger, and again discharging the heat-exchanged air into an outdoor space; a base having parts constituting the indoor part and the outdoor part installed thereon; and a barrier integrated with the base, for partitioning an upper space of the base into the indoor part and the outdoor part.

A SRAM core cell for a light-emitting display applicable to a data driver of an organic electro-luminescence light-emitting display device includes thin film transistors as a data memory for a data driver of the light-emitting display. The SRAM core cell also includes switching transistors and data memory transistors. The switching transistors are coupled to a bit line and a word line to select data writing or reading. The data memory transistors are coupled to a power voltage or a ground voltage to enable data writing and reading. The bit line and the word line are formed in first and second directions. The channels of the switching transistors and the data memory transistors are formed in an oblique direction with respect to the first and second directions.

The present invention provides a ventilation system for improving air quality of an indoor space. The system includes sensors for measuring PM2.5 particle level P, CO2 level C, and TVOC level T in the indoor space. A control circuit is configured to receive P, C and T values and generate an output signal Vout according to a specific algorithm, which in turn controls speed-variable EC motors that drive ventilating fans. The invention exhibits numerous technical merits such as lower energy consumption, programmable operation, high efficiency, and lower noise, among others.

In order to provide sound absorbing structure capable of reducing the noise of electronic equipment while maintaining the cooling capability of the electronic equipment, there is provided sound absorbing structure in which a plurality of penetrating openings are provided by arranging a plurality of acoustic materials having a predetermined shape at predetermined intervals in a flow channel of cooling fluid from a blower, and the plurality of acoustic materials are arranged so that the sound vertically incident on a penetrating plane of the penetrating openings from the blower does not directly go out of the electronic equipment.

The invention discloses a wall-hanging type air conditioner, which comprises an indoor machine with a shell body, wherein a heat exchanger and a main air duct are formed inside the shell body; the shell body is provided with a main air inlet and a main air outlet; a main injection flow fan is formed inside the main air duct; a fisrt drainage air outlet is formed below the main air outlet on the shell body; a first drainage air duct separate from the main air duct is formed inside the shell body below the main air duct; the first drainage air duct is communicated with the first drainage air outlet; a first drainage flow fan is formed inside the first drainage air duct; the shell body is also provided with a second drainage air outlet; the second drainage air outlet is located on the outer side of the main air outlet next to an upper edge of the main air outlet; a second drainage air duct separate from the main air duct is also formed inside the shell body; the second drainage air duct is communicated with the second drainage air outlet; and a second drainage flow fan is formed inside the second drainage air duct. By adopting the wall-hanging type air conditioner provided herein, mixing ventilation can be realized on the basis that the main air duct is not changed.

The invention relates to a noise reduction structure of main noise resources of an urban indoor substation, belonging to the technical field of noise pollution control in environmental engineering. The noise reduction structure is mainly used for reducing the noise resources of the urban indoor substation, including noise radiated by a main transformer and a reactor 1. The noise reduction structure comprises a wall perforated plate resonance sound absorption structure 2, a sound isolation door 3, a ventilating shutter 4, a low-noise axial flow fan 5, an air intake silencer 6 and an air exhaust silencer 7, wherein the wall perforated plate resonance absorption structure 2 is located inside the wall and comprises a perforated gypsum plate and acrylic cotton; the sound isolation door 3 is filled with glass coated intermediate glass cotton fiber, and the gap of a door frame is filled with sealing strips; the ventilating shutter 4 and the low-noise axial flow fan 5 are used for ventilating and dissipating heat to ensure the safe and stable operation of the main transformer and the reactor; the air intake silencer 6 is installed on the outer part of the ventilating shutter 4, the upper part is a lighting sound-isolating window cover, and the lower part is an air flow channel covering the sound absorption material; and the air exhaust silencer 7 is installed outside a ventilating fan hole, and the interior is an air flow channel covering the sound absorption material.

This indoor unit for air conditioner comprises the cabinet in which a blower for forcing the flowing of air and a heat exchanger are set, the air suction ports provided on three surfaces of the cabinet to suck the indoor air into the cabinet, and the air discharge ports provided on three surfaces of the cabinet to discharge the indoor air heat-exchanged within the cabinet to three directions.

A ventilating device and an outdoor unit including the same are disclosed. More particularly, the present invention relates to a ventilating device including a counter-rotating fan having improved wind ventilation efficiency as well as minimized noise generated during the fan operation.

The invention provides an operation control method, a device, an air conditioner and a computer readable storage medium. The operation control method comprises the following steps: when the air conditioner is detected to operate in a heating mode and meets preset conditions, a coiler temperature of an outdoor condenser is obtained; and a rotating speed of an outdoor fan is adjusted according to acorresponding relation between the coiler temperature of the outdoor condenser and a preset temperature range, wherein the coiler temperature of the outdoor condenser is in negative correlation with the rotating speed of the outdoor fan. The operation control method effectively delays the frosting time, prolongs effective operation time length of the heating mode, reduces frequent frosting and defrosting problems of the air conditioner, prolongs the service life, and facilitates to improve the use experiences.

The invention discloses a wall-hanging type air conditioner indoor machine, which comprises a shell body, wherein a heat exchanger and a main air duct are formed inside the shell body; a main air inlet and a main air outlet that is communicated with the main air duct are formed on the shell body; a main injection air blower that is used to blow out the heat exchanged air after being exchanged by the heat exchanger from the main air outlet is formed inside the main air duct; a drainage air outlet is formed on the shell; the drainage air outlet is located at an outer side of the main air outlet next to an upper edge of the main air outlet; a drainage air duct separate from the main air duct is formed inside the shell body; the drainage air duct is communicated with the drainage air outlet; a drainage blower is formed inside the drainage air duct; and the drainage blower is used to lead the heat non-exchanged air to the drainage air duct and blow the heat non-exchanged air out from the drainage air outlet through the drainage air duct. By utilizing the wall-hanging type air conditioner provided herein, mixed air sending can be realized on the bases that the main air duct is not changed.

The invention discloses a combined air deflection assembly which comprises a mounting shell, at least one first air deflector, at least one second air deflector, at least one upper air deflector, at least one lower air deflector and a driving assembly, wherein the at least one first air deflector is arranged on the mounting shell along the left-and-right direction; the at least one second air deflector is arranged on the mounting shell along the left-and-right direction in a mode of synchronously swinging left and right; the at least one second air deflector is positioned in the front side of the at least one first air deflector and is staggered with the at least one first air deflector; the at least one upper air deflector is vertically arranged at the upper part of the corresponding first air deflector; each upper air deflector is inclined forwards and upwards and is at an included angle alpha with the horizontal plane; the at least one lower air deflector is vertically arranged at the lower part of the corresponding first air deflector; each lower air deflector is inclined forwards and downwards and is at an included angle beta with the horizontal plane; the driving assembly is used for driving the second air deflectors to swing synchronously. The combined air deflection assembly has high air deflection efficiency, low wind resistance and a large air supply range. The invention also discloses a vertical air conditioner.