174results about How to "Reduce noise value" patented technology

The present invention includes a turn-off signal modulating circuit that periodically varies a turn-off timing of a switching element 2 at a preset modulation time after a current detection by a drain current detecting circuit 15, and by modulating the peak of a current flowing through the switching element 2, diffuses switching noise while preventing concentration of an oscillating frequency at a constant frequency even under a constant input voltage and a constant load.

The invention discloses a control method of a natural wind air conditioner. The control method comprises the following steps that a noise value of current surrounding environment during operation of the natural wind air conditioner is collected in real time; according to the noise value of the current surrounding environment, a corresponding rotating speed threshold value is obtained; according to the rotating speed threshold value, the rotating speed of a fan during operation of the natural wind air conditioner is subjected to speed limiting processing, so that the noise value of the current surrounding environment is lowered. According to the control method of the natural wind air conditioner, the noise of the surrounding environment during operation of the natural wind air conditioner can be effectively controlled, the requirement of noise is met when a user enjoys natural wind, and the comfort of natural wind is further improved. The invention further discloses the natural wind air conditioner.

A tyre for a motor car includes a tread and two shoulders. The tread includes at least one circumferential row of blocks disposed between first and second circumferential grooves. Each of the blocks is delimited by a section of the first circumferential groove and by first and second transverse grooves that extend from the first circumferential groove and converge at a common vertex spaced from the second circumferential groove. The common vertex is separated from the second circumferential groove by a continuous circumferential tread rib. A second transverse groove that delimits a first block is separated from a first transverse groove that delimits a circumferentially adjacent block by a solid tread portion. The solid tread portion extends from the first circumferential groove to the circumferential tread rib and forms a single body with the circumferential tread rib, spacing the first block and the circumferentially adjacent block from each other.

It is intended to provide a memory control device and memory control method capable of reducing charge/discharge current consumed while various commands are inputted to a semiconductor memory device and reducing occurrence of power noises. During periods TT1, TT2, and TT3 which are parts of a period tCKE in which a clock enable signal CKE is in active state, supply of a control clock SD_CLK from a memory control device 1 to a synchronous-type semiconductor memory device 12 can be stopped. Furthermore, in case an input of a data input/output period of an external command and that of refresh operation period of a refresh command RCMD overlap and an access region of the external command and that of the refresh command RCMD do not coincide, those commands are converted to control command signal SD_CMD in parallel, whereby parallel conversion processing operation can be conducted.

The invention relates to a fluorescence detection method for trace tetracycline antibiotics. According to the method, by utilizing the combined action of tetracycline antibiotics molecules and the specificity of an aptamer thereof, an amplification action of a rolling ring amplification signal and high selection action of a graphene molecular beacon as well as combining a fluorescence spectrophotometer, the fluorescence signal of the graphene molecular beacon is obtained, so that quantitative detection of trace tetracycline antibiotics can be realized. According to the method, a plurality of defects of the prior art such as complexity in detection are overcome, the sensitivity and selectivity are improved, and a new method is provided for detection of other small molecule substances or pollutants.

The invention provides a noise reducing device, a manufacturing method thereof and a freezer and solves the problem of poor noise reducing effects in the prior art. According to the technical scheme, the noise reducing device comprises a tubular body, both ends of the tubular body are provided with necked openings, one of the necked opening is connected with a refrigerant inlet pipe, and the other necked opening is connected with a refrigerant outlet pipe; the inside of the tubular body is provided with at least one taper cap, the taper cap is provided with a plurality of silencing holes and at least two liquid separating holes. The invention also provides the manufacturing method of the noise reducing device and the freezer comprising the noise reducing device. The noise reducing device can fully release the pressure of jet flow of capillary pipes, diverse the jet flow through the taper cap to achieve gas-liquid separation, filter sound waves through the round holes in the taper cap, achieve reflection and attenuation of sound waves within a certain frequency band in a first chamber and a second chamber to effectively reduce noise, solve the problem of noise emission of the freezer system of a refrigerator and improve the auditory feeling of users.

The invention discloses a dual-membrane dual-core cascaded slightly-concentrated water reverse osmosis device and a control method thereof. The dual-membrane dual-core cascaded slightly-concentrated water reverse osmosis device comprises a water channel device and a circuit device. The water channel device comprises a municipal tap water inlet, a primary filter element, a secondary filter element, a tertiary filter element, a booster pump and a first reverse osmosis membrane component which are sequentially connected through a pipeline, a water inlet control valve is arranged on a pipeline between the tertiary filter element and the booster pump, the first reverse osmosis membrane component is communicated with a purified water channel and a concentrated water channel, the purified water channel comprises a Y-shaped three-way joint communicated with the first reverse osmosis membrane component through a pipeline, the Y-shaped three-way joint is communicated with a T-shaped three-way joint through a pipeline, one way of the T-shaped three-way joint is communicated with a pressure barrel through a high-pressure switch, another way of the T-shaped three-way joint is communicated with a water faucet through a rear activated carbon filter element, the concentrated water channel comprises a second reverse osmosis membrane component communicated with the Y-shaped three-way joint through a pipeline, and the second reverse osmosis membrane component is communicated with a drain pipe on which a combined wastewater electromagnetic valve is arranged.

The invention discloses a filter with a silencing function. The filter comprises a shell, wherein the shell is hollow and cylindrical and the two ends of the shell shrink inwards to form ports; filter screens and a silencing silk screen layer are arranged in the shell; and the silk screen layer is fixedly arranged between two layers of filter screens, perforated plates or slit plates. The silk screen layer which is made by pressing SUS (Stainless Steel) wires is additionally arranged in the filter of the air conditioner. Since the silk screen layer consists of extremely fine wires, fine communicating gaps exist among the wires. When noise passes through the gaps of the silk screen, the noise is subjected to friction with the silk screen to be converted into heat energy to reduce a noise value. On the other hand, when two phases of refrigerants pass through the silk screen layer, the cavitation noise can be greatly reduced because of a cutting effect of the small gaps of the silk screen. Thus, the high frequency noise such as air flow impact noise and cavitation noise can also be greatly reduced apart from that the filtering capacity of the filter is further improved, so that the comfort of the air conditioner is greatly improved.

The invention provides a noise control method and device, a fresh air conditioner and a readable storage medium. The noise control method comprises the step of enabling a control unit to reduce the rotating speed of an indoor fan and/or a fresh air fan according to a preset first relation table between the rotating speed of the indoor fan and a noise value and a second relation table between the rotating speed of the fresh air fan and the noise value when the total noise value of the indoor fan and the fresh air fan exceeds a preset threshold value, so that the total noise value of the indoorfan and/or the fresh air fan during simultaneous operation is reduced, the situations that the noise of the fresh air conditioner is too large and affects the comfort of users are avoided.

The invention discloses a control method of the air conditioner. A counter-rotating fan is arranged in an air duct of the air conditioner, and comprises two oppositely arranged wind wheels, the air conditioner is further provided with a noise sensor for detecting the noise value generated by the air conditioner, an air blocking part is arranged on an air inlet of the air conditioner, and the air blocking part can move relative to the air inlet to adjust the air inlet area of the air inlet. The control method of the air conditioner comprises the following steps that the noise value collected bythe noise sensor is collected in real time or at regular intervals; whether the noise value meets the noise lowering condition or not is judged; when the noise value meets the noise lowering condition, the air blocking part is driven to move relative to the air inlet to reduce the air inlet area of the air inlet, so that the noise value generated by the air conditioner is reduced, wherein the adjusted air inlet area of the air inlet is within a preset area section. The invention further discloses the air conditioner and a storage medium. According to the air conditioner, the problem of disturbing residents is solved on the premise of meeting user needs.

The exhaust silencer with variable exhaust pipe cross section of internal combustion engine includes one casing, one air inlet silencing pipe and one exhaust silencing pipe inside the casing cavity, three partition boards set inside the cavity to separate the cavity into four chambers and one intermediate silencing pipe. The air inlet silencing pipe has its closed end penetrating the front end cap, the first partition board and two chambers and combining with the second partition board. The exhaust silencing pipe includes two pipes of different lengths and sizes, their closed ends penetrate the back end cap and the last chamber and combine with the third partition board, and the large and short pipe has one exhaust control valve in the opened end. The intermediate silencing pipe has its opened end located inside the second chamber and the closed end inside the third chamber.

The invention provides a combined single-side air inlet cooling tower. The combined single-side air inlet cooling tower comprises a first tower body, a second tower body and a circulating water systemtower outer part, wherein the first tower body, the second tower body and the circulating water system tower outer part are abutted on the back; a first water remover, a first water distributor, a first packing layer and a first water collecting device are sequentially arranged in the first tower body from top to bottom, and a first water collecting tank is arranged at the lower part of the firstwater collecting device; a second water remover, a second water distributor, a second packing layer and a second water collecting device are sequentially arranged in the second tower body from top tobottom, and a second water collecting tank is arranged at the lower part of the second water collecting device; and the first water collecting tank and the second water collecting tank are simultaneously connected with a water collecting tank, the water collecting tank communicates with the circulating water system tower outer part, and the circulating water system tower outer part is respectively connected with the first water distributor and the second water distributor. The combined single-side air inlet cooling tower provided by the invention has the advantages of saving energy consumption and improving the economic and environmental friendliness of the cooling tower on the basis of ensuring the cooling efficiency and the ventilation effect of the cooling tower.

The invention provides an indoor unit of an air conditioner. A fresh air duct is connected with a main air duct and/or a purification air duct of the air conditioner indoor unit in series, wherein a fresh air module of an in-pipe fresh air fan is arranged in a fresh air pipe; and the adjacent distance between every two adjacent in-pipe fresh air fans is limited. According to the arrangement structure, when at least an air conditioner mode and a fresh air mode operate at the same time, the temperature of fresh air introduced into a room from the fresh air pipe is adjusted; on one hand, the temperature adjusting effect on the fresh air can be improved; on the other hand, the main air duct or the purification air duct can be effectively utilized for increasing the fresh air volume; in addition, due to the arrangement of the adjacent distance between every two adjacent in-pipe fresh air fans, turbo-charging airflow can be formed between every two adjacent in-pipe fresh air fans, the freshair volume introduced from the outside is remarkably increased, indoor fresh air noise is effectively controlled, and the noise value is obviously reduced; and furthermore, the in-pipe fresh air fansare arranged in the fresh air duct, the space of the air conditioner indoor unit does not need to be increased, and the overall performance of the air conditioner indoor unit is improved.

The invention discloses a design method of the profile of a volute of a centrifugal fan. According to the design method of the profile of the volute, R0 is the radius of an impeller of the centrifugal fan, and A is the opening of a spiral line. The method comprises steps as follows: 1) using CATIA software for establishing a group of points by the aid of polar coordinates in a CATIA software sketch, wherein the polar coordinates of the points are (R(theta), theta), R(theta)=R0*e<theta/K> is an equation I, e is a mathematical constant, equal to 1 plus 1/(1!)plus 1/(2!)plus 1/(3!) plus...plus1/(n!) and approximately equal to 2.71828, theta is any degree and is required to be converted into a radian unit, and K is a fixed constant and is calculated through A=R(360)-R0 and the equation I; 2) sequentially connecting all the points according to a spline command to establish a spline; 3) double-clicking the spline to pop up a 'spline definition' dialog box, defining all control points in the dialog box to be tangent, and finishing the establishment of the profile of the volute after definition. The noise value of the fan of an air conditioning system can be effectively deceased, and the efficiency of the centrifugal fan of the air conditioning system is improved.

The invention discloses an enzyme based electrochemical biosensing method applied to detection of trace mercury ions, belonging to the field of environment analysis. By virtue of specific actions of thymine and mercury ions and circle amplification function of nucleotide excision enzyme III, the trace mercury ions can be detected; probe DNA hybridizes with target DNA by capturing mercury ions to form double-chain DNA of a special structure; consequently, pDNA is digested by ExoIII, while tDNA is free and continues to hybridize with other pDNAs, and the process is repeated; the pDNA remained after digestion is in direct proportion to [Ru(NH3)6]<3+> electrical signal strength, so that mercury ions can be detected. The enzyme based electrochemical biosensing method has the characteristics of high sensitivity, high selectivity and low cost; the linear detection range of mercury ions is 0.01-500nM; the detection limit is 1pM.

The invention relates to a fresh air ventilator, in particular to an airflow direct connection wall hanging type fresh air ventilator, and belongs to the field of indoor ventilation and aeration equipment. The airflow direct connection wall hanging type fresh air ventilator comprises a power-assisted fan component, a main fan assembly and an external filtering layer, and the power-assisted fan component is buried in a wall hole of a room outer wall; the main fan assembly comprises an internal machine shell body installed at the inner side face of the room outer wall, a main fan and a fresh air outlet with an outlet valve, the main fan and the fresh air outlet are arranged in the internal machine shell body in the air supplying direction in sequence, a fresh air inlet connected with the air outlet end of the power-assisted fan component is formed in the back face of the internal machine shell body, and the impeller rotary plane of the main fan is parallel to the room outer wall. Compared with the prior art, the airflow path in front of a main fan inlet is directly connected, the airflow in front of a main fan outlet is directly connected to an indoor room, the airflow path is directly connected and free of a redundancy process, many technological measures for eliminating and reducing noise by arranging two fans, the hollow machine shell, the main fan on at the rear portion of the filtering layer and the like are mainly adopted, and the effects of small noise and a large air volume are achieved.

The invention discloses a control method of an air purifying device. The air purifying device comprises a purifying air duct and a purifying assembly, wherein the purifying assembly comprises a rotating body and a water pump; the rotating body is rotatably arranged in the purifying air duct and is used for throwing water outwards to purify particulate matter in air in the purifying air duct through rotating when the water output by the water pump is sprayed onto the rotating body; the control method of the air purifying device comprises the following steps of starting a purifying function of the air purifying device, and controlling the rotating body to be started; and after the rotating body operates, controlling the water pump to operate so as to spray the water to the rotating body. Theinvention further discloses the air purifying device. The air purifying device is small in value of generated noise.

The invention relates to an air cleaner structure for a motorcycle. The air cleaner comprises a body, a filter screen frame, an upper cover and a clapboard, wherein the body is provided with a connecting pipe which is connected with an engine, the filter screen frame is provided with a through hole and is provided with a filter screen, and the upper cover is provided with an air inlet. The side wall of the body is provided with a channel which can be embedded with the clapboard, the clapboard is arranged on the side wall of the body to avoid negative pressure which is caused by air suction ofthe engine, and the side wall of the body generates a resonance sound or a sucking sound because of vibration so as to achieve efficacy of reducing a noise value of the motorcycle.

The invention provides refrigerating equipment which comprises a shell, a compressor, a sound isolating cover and a viscoelastic film layer, wherein an accommodating space is formed in the shell; thecompressor is arranged in the shell; the sound isolating cover at least comprises a sound absorbing layer and micro perforation plates which are successively arranged from outside to inside, the soundabsorbing layer is provided with a plurality of first sound absorbing parts penetrating the sound absorbing layer, and at least one perforation plate is arranged and a plurality of second sound absorbing parts penetrating the micro perforation plate are arranged on the micro perforation plate; when the radiation noise frequency of the compressor reaches a first frequency, the viscoelastic film layer resonates to consume energy and drive air to fluctuate in a reciprocating manner between the first and second sound absorbing parts to rub to consume energy; when the radiation noise frequency ofthe compressor reaches a second frequency, an air column in the second sound absorbing part resonates, rubs with the second sound absorbing part to consume energy, and at least can drive the viscoelastic film layer in the second sound absorbing part to vibrate to consume energy an drive air in the first absorbing part to fluctuate to consume energy. The refrigerating equipment solves the problem that the refrigerating equipment in the prior art is poor in sound isolating effect to the compressor.