187results about How to "Reduce flow noise" patented technology

A method and apparatus are disclosed that allow Conformal Vortex Generator art to improve energy efficiency and control capabilities at many points in a turbomachine or device processing aero / hydrodynamic Newtonian fluid-flows.

A flow sensor is provided having a substrate with a sensing element and flow channel aligned over the sensing element. The sensing element senses at least one property of a fluid. The flow channel is aligned by one or more guide elements formed in an alignment layer. The flow channel across the sensing area is accurately and precisely aligned due to the guide elements provided at the wafer-level, facilitating reliable, low-cost, and consistent results among multiple flow sensors. The flow sensor is adapted for use in harsh environments.

In a spray gun (1) for atomizing fluids, that can be actuated using a lever (15) mounted in a pivoting arrangement on a sleeve (11) which accommodates an atomizer nozzle (12) and in which the air flow can be generated by an air turbine (5) that is assigned to the spray gun (1), the air turbine (5) and its electric drive motor (4) are arranged substantially coaxially to the sleeve (11) on the opposite side of a handle (21) and the air flow is supplied from the air turbine (5) in a substantially straight line through the sleeve (11) of the atomizer nozzle (12). The air turbine (5) is provided with a muffler (6). Loud operating noise of the air turbine (5) does not have a disruptive effect and practically no flow noise is generated due to deflections of the air flow. The components of the spray gun (1) are arranged in such a way that no more than slight tilting torques are generated, permitting work over long periods without leading to fatigue.

A method and systems are disclosed for reducing fluid flow noise. The method and systems use a thermal mechanism to deploy a flap edge fence during landing and / or other operating conditions, and stow the flap edge fence during other operational conditions such as cruise. The flap edge fence is controlled passively by ambient temperature or actively by a controller based on temperature changes corresponding to various operating conditions.

The invention discloses a prepositioned flow adjuster of an ultrasonic flow meter, comprising an adjuster shell, a rectifying pore plate, a rectifying grid device and connecting flanges, wherein the rectifying pore plate and the rectifying grid device are arranged at an inlet end and an outlet end of the adjuster and are respectively sleeved into the two ends of the adjuster shell; the connecting flanges are fixedly connected at the two ends of the adjuster shell; the rectifying pore plate and the rectifying grid device are fixed on the adjuster shell through the connecting flanges; the connecting flange at the end of the adjusting pore plate is connected with a water flow pipeline to be an upstream of flowing the adjuster; and the connecting flange at the end of the rectifying grid device is connected with an inlet of the ultrasonic flow meter to be a downstream for flowing the adjuster. According to the prepositioned flow adjuster of the ultrasonic flow meter, the measurement accuracy and the stability of the ultrasonic flow meter can be effectively improved; and meanwhile, the prepositioned flow adjuster can be used for other flow measuring equipment or fluid transporting pipeline equipment.

A vehicle air conditioning apparatus includes a hot water valve for adjusting a flow amount of hot water flowing into a heating heat exchanger, a bypass passage through which air bypasses the heating heat exchanger, and a bypass door for opening and closing the bypass passage. In a high-temperature side area where temperature of air blown into the passenger compartment becomes higher, the temperature of air to be blown into the passenger compartment is adjusted by a hot-water flow adjustment of the hot water valve while the bypass door is operated at a fully closed position. On the other hand, in a low-temperature side area where temperature of air blown into the passenger compartment becomes lower, the temperature of air to be blown into the passenger compartment is adjusted by combining the hot-water flow adjustment of the hot water valve and the air flow adjustment of the bypass door. Thus, even in a minute flow area of hot water flowing into the heating heat exchanger, the temperature of air blown into the passenger compartment is accurately adjusted.

A horizontally installed muffler may include a housing, first and second tail pipes installed to front and rear ends of the housing through the housing, an introduction chamber formed inside the housing and to which an outlet of the exhaust pipe is connected, a first intermediate pipe fluid-connected to the introduction chamber and having a first discharge hole, a discharge chamber fluid-connected to the introduction chamber through the first discharge hole of the first intermediate pipe, wherein each end of the first and second tail pipes and the first discharge hole are disposed inside the discharge chamber, first and second resonance chambers formed inside the housing, a second intermediate pipe fluid-connected to the first and second resonance chambers through the discharge chamber and the introduction chamber and having an introduction hole disposed inside the introduction chamber and a second discharge hole disposed inside the discharge chamber.

The invention discloses a method for eliminating the abnormal sound of an air conditioner. The method comprises the steps that when an air conditioner starting command is detected, a compressor is controlled to start, and an electronic expansion valve is controlled to operate at an initial opening degree; and when the operation time of the compressor is shorter than the first preset time after the compressor starts, the initial opening degree is kept as the operation opening degree of the electronic expansion valve. The invention further discloses a device for eliminating the abnormal sound of the air conditioner. In the starting stage of the compressor, the initial opening degree is kept as the operation opening degree of the electronic expansion valve, and the abnormal flowing sound, caused by continuous adjustment of the electronic expansion valve, of a refrigerant in the refrigerant pressure balancing process can be effectively lowered.

Disclosed here is an air conditioner and the control method thereof comprising an outdoor unit having an outdoor heat exchanger for the heat exchanging of the outdoor air and refrigerant; at least one indoor unit corresponding to the outdoor unit and having indoor heat exchanger for the heat exchanging of the room air and refrigerant; an expansion valve installed on the refrigerant pipe connecting the outdoor heat exchanger and the indoor heat exchanger, and expanding the refrigerant; and a control device controlling the opening speed of the expansion valve in accordance with the operation modes of the indoor unit.

A flow sensor is provided having a substrate with a sensing element and flow channel aligned over the sensing element. The sensing element senses at least one property of a fluid. The flow channel is aligned by one or more guide elements formed in an alignment layer. The flow channel across the sensing area is accurately and precisely aligned due to the guide elements provided at the wafer-level, facilitating reliable, low-cost, and consistent results among multiple flow sensors. The flow sensor is adapted for use in harsh environments.

A medical functional device includes at least one first fluid system for receiving at least one medical fluid, at least one first conveying device for conveying the medical fluid, at least one second fluid system for receiving at least one operating fluid, and at least one second conveying device for operating the at least first conveying device, in which the first conveying device is arranged such as to be actuated by means of the operating fluid. A treatment apparatus and a method are also described.

The invention discloses a bionic resistance-reducing noise-reducing surface of a rigid and flexible structure. The bionic resistance-reducing noise-reducing surface of the rigid and flexible structure is formed by alternatively distributing rigid ribs and flexible strips on a rigid surface, the section of each rigid rib is semicircular or triangular or semielliptical or the like, each rigid rib is higher than each flexible strip by 0.2-5mm, the interval between the rigid ribs is 1-15mm, and the thickness of each flexible strip is 0.5-4mm. Middle grooves formed by the rigid ribs on the rigid surface can limit the extensible motion of a streamwise vortex, bursting intensity of turbulence on a wall surface is lowered, and frictional resistance of the wall surface is lowered. A flexible strip wall surface between every two rigid ribs can reduce pulse pressure generated by the turbulence on the wall surface, the frequency of falling of the vortex on the wall surface is suppressed, frictional resistance is further reduced, and flowing noise is reduced.

Disclosed is a device for reducing flow noise. In order to achieve a low flow noise, the device includes inlet apertures for receiving a fluid flow, chambers into which one or more inlet apertures open up, a cross-sectional area of a single chamber being larger than a combined flow cross-sectional area of the inlet apertures opening up thereto, and chamber-specific outlet apertures for forwarding the fluid flow from the chamber, a flow cross-sectional area of each outlet aperture being smaller than the cross-sectional area of the chamber, and the combined flow cross-sectional area of all outlet apertures of the single chamber being larger than the combined flow cross-sectional area of the inlet apertures opening up into said chamber.

An exhaust system of a turbo-charged engine includes an exhaust pipe connected to a turbo-charged engine, a front muffler, and a rear muffler disposed in the exhaust pipe in an order of the front muffler and the rear muffler in a direction of flow of exhaust gas. Each muffler of the front muffler and the rear muffler includes an inner pipe. The inner pipe extends straight and continuously from an inlet to an outlet of each muffler and is not throttled in diameter between the inlet and the outlet of each muffler. Each muffler does not include an enlarged chamber in each muffler. The front muffler includes a high-frequency resonance chamber outside the inner pipe. The rear muffler includes a high-frequency resonance chamber and a low-frequency resonance chamber outside the inner pipe.

The invention relates to a connecting structure of an evaporator and a capillary tube, wherein the capillary tube is provided with a liquid inlet and a liquid outlet; the evaporator comprises an evaporation tube provided with a liquid inlet end; a transition connecting tube is arranged between the evaporation tube and the capillary tube; the transition connecting tube is provided with a first connecting part and a second connecting part; the internal diameter of the transition connecting tube at a first connecting part is consistent with the external diameter of the capillary tube at the liquid outlet; the external diameter of the transition connecting tube at a second connecting part is consistent with the internal diameter of the evaporation tube at the liquid inlet end; the first connecting part is connected with the liquid outlet of the capillary tube; the second connecting part is connected with the liquid inlet end; the internal diameters of the transition connecting tube at the first connecting part and the second connecting part are same; and the central lines of the capillary tube, the transition connecting tube and the evaporation tube are positioned on the same straight line. The connecting structure provided by the invention can effectively reduce the noise of a refrigerant in the flowing process by additionally arranging the transition connecting tube.

An airflow circulating system for refrigerator comprises an air delivering apparatus, an air inlet and an air duct, the air delivering apparatus is an cross flow fan which is arranged on the upper part of the air duct and on the lower part of the air inlet, a volute tongue is provided on the air duct of the inner side of the cross flow fan, a volute casing is provided on the air duct of the outer side of the cross flow fan; the shaft line of the cross flow fan can be perpendicular to the lateral face of the refrigerator, the rotation direction of the cross flow fan directs to the air inlet; the volute casing is big arc-shaped and spiral line-shaped, the tip terminal shape of the volute tongue is circular arc-shaped; the cross flow fan comprises 2-6 impellers; each impeller comprises n blades with different centre angles and end sheets; the neighboring impellers are staggered with a certain angle along the circumferential direction. The airflow circulating system can be used for an wall hanging type air conditioner indoor set, an air curtain machine, an air heater and a dehumidifier. The invention has low flowing noise, is easy to be deposited inside of the air duct, can greatly reduce the refrigerator air duct dimension when applied to the refrigerator, thereby improving the refrigerator volume.

The gas turbine exhaust sound suppressor, or exhaust silencer, and method are for a gas turbine and reduce low frequency exhaust flow noise while avoiding the creation of additional acoustical standing waves, e.g. from wake shedding at certain predictable frequencies. A plurality of elongated flow obstruction members, e.g. pipes or airfoils, extend within the exhaust passage to reduce acoustic waves within the exhaust flow, and at least some of the elongated flow obstruction members have different widths. Each of the elongated flow obstruction members is positioned at a respective angle within a predetermined angular range transverse to the flow direction, with the predetermined angular range being greater than or equal to 10 degrees from normal to the flow direction.

A ventilator is provided. The ventilator includes blowers 60 and 70; ducts 62 and 72 that are connected to the blowers 60 and 70 to form a blow path having at least one bent part; and a sound-absorbing material 90 that is provided in the bent part of the blow path of the ducts 62 and 72 to absorb noise within the blow path thereof. Therefore, it is possible to remarkably reduce or prevent flow noise that is propagated to the inside of a room as noise of a flow passing through the ducts 62 and 72 is absorbed by the sound-absorbing material 90.

This invention relates to electronic valve controlling method of air conditioner. It includes: steps for all the indoor machines stop working; steps for compressor stops working and after certain times, the opening degree of all electronic valves that connect to indoor machines reach full-opening degree. This invention can decrease refrigerants flowing noise of electronic valve after compressor stopping working.

A fan (60) with a sound deadening box has in its body (3) a double inlet centrifugal fan (9) and an inlet-port sound absorber (11) formed between the fan (9) and a body air inlet (1). The fan (60) further includes a casing-inlet-port-side air passage (26) and triangular prism shaped first inlet-port-sound-absorber air passage (27). With this structure, the fan (60) has a low pressure loss, a low input, high static pressure, and a low level of airflow collision noise.

This invention concerns a control valve for a ventilation system of an automobile, with at least one edge over which air flows, which can be moved from at least a first into at least a second position. The control valve as per the invention is mainly two-dimensional and has in particular a changing cross-sectional profile in the area of the overflowed edge. Due to this cross-sectional profile, at least one sub area of the overflowing air is diverted into a number of flow directions deviating from the main flow direction.

An electromagnetic flow rate transducer of no insulated measurement tube consists of a rigid measurement tube with internal diameter of D to let fluid to be measured flow through and an excitation unit set on rigid measurement tube for generating magnetic field B vertical to fluid flowing direction. It is featured as generating induction potential E of fluid with flowing speed V in said tube under action of magnetic field B, setting a and B measuring points in action scope of magnetic field B to directly lead output signal X out for measuring.

The invention provides frames equipped on skylight, composing a drainage channel capable of preventing material and size enlargement because of instantaneous increment of stream. Frames (4) equipped on skylight comprise: a guide rail (11) supporting a slide panel (3) to freely move at front and back directions of vehicles; and a side drainage slot (12) extending at outer side of the guide rail along it. A hollow closed section (18) is extended at side part of the side drainage slot along it in frames equipped on skylight. A funnelled connection element (20) for connecting a drainage pipe (19) is mounted on a position facing to the hollow closed section and end surface of the side drainage slot.