30results about How to "Constant air volume" patented technology

An exhaust system for exhausting air from a space includes a variable-volume exhaust air moving system having at least one fan having an inlet and an outlet. A duct is connected to the inlet and an outlet nozzle defining a variable cross-sectional outlet area is fluidly connected to the outlet. A selectively operable bypass damper is fluidly connected to the inlet. A sensor is located in the exhaust system for detecting at least one of a pressure condition and a flow condition therein. A control system controls the at least one fan, the outlet nozzle, and the bypass damper, based on a signal sent from the sensor.

The invention provides a method for determining remaining time of cleaning a filter screen in air feeding equipment. The air feeding equipment comprises the filter screen and an air feeding fan; and the filter screen is arranged on an air flue of the air feeding fan. The method comprises the following steps of regulating the rotation speed of the air feeding fan according to a current change condition of the air feeding fan, and enabling air quantity output of the air feeding equipment to be constant; and determining remaining time of cleaning the filter screen according to the rotation speed increase rate of the air feeding fan. The method provided by the invention can be used for detecting filth blockage degree of the filter screen in real time, so that remaining time is determined; and moreover, the rotation speed of the fan can be increased according to the filth blockage degree of the filter screen to ensure constant air quantity output by the system, and therefore, a comfortable environment is provided for a user. The invention further provides a control method for the air feeding equipment and the air feeding equipment.

The invention discloses a constant-air-volume motor drive control method for a fan. The constant-air-volume motor drive control method comprises the following steps: determining Duty 0, N0, I0 and CFM0, keeping Duty0 unchanged, and blocking the sectional area of an air flue opening; respectively obtaining Nx, Ix and CFMx under different Sx values while an initial sectional area is S0 and an effective ventilation sectional area is Sx; obtaining a stepless speed regulation datum reference curve; enabling the CFMX to be identically equal to CFM0 by regulating Dutyx, thereby obtaining current Nx, Ix and Dutyx; obtaining a constant-air-volume regulating datum curve; setting Dutyx as Duty0, and measuring Nx and Ix; according to the stepless speed regulation datum reference curve and the constant-air-volume regulating datum curve, correcting a duty ratio to be Dutyx, and enabling air volume CFMx of an air outlet to be identically equal to CFM0. In case of no sensor feedback, the control method realizes intelligent control of constant air volume of the fan, and improves the reliability of motor control.

The invention discloses a constant air volume control method of an air conditioner. The air conditioner comprises an air pressure sensor; the constant air volume control method of the air conditionerincludes steps of detecting current air pressure of an air outlet of the air conditioner through the air pressure sensor, acquiring the target air volume set by a user; calculating the current air volume according to current air pressure, and calculating the air volume differential value between the current air volume and the standard air volume; correspondingly controlling the motor rotate speedof the air conditioner according to the differential value of the air volume, thereby keeping the constant air volume of the air conditioner. The invention further discloses an air conditioner and a computer readable storage medium. According to the constant air volume control method of the air conditioner, the air conditioner and the computer readable storage medium, the constant air volume control of an indoor air conditioner is realized, and the cooling and heating effects of the air conditioner are improved.

To operate the air circulation and convey the stock flow of scrap material comminuted in the housing (1) of a hammer mill, the airflow generated by the blower effect of a rotor (2) and the stock flow passing through an upper classifying grate (4) are diverted by a deflector hood (8) and guided vertically downwards into a duct (6) that is separate from the housing (1). The stock flow is combined with the stock flow classified in the area of a lower classifying grate (5). The air flow is then guided in the circulating air and the combined stock flow is conveyed to a device (11) for further processing, sorting and / or conveyance.

Provided are an outdoor electronic newspaper stand and a fast cooling device of the outdoor electronic newspaper stand. The cooling device comprises a first face plate, a second face plate, a third face plate, a fourth face plate, an air supply opening, an air return opening, an air inlet, an air outlet and a heat exchange component. The first face plate and the second face plate are opposite, the third face plate and the fourth face plate are opposite, and the third face plate and the fourth face plate are adjacent to the first face plate and the second face plate. The air supply opening is formed in the first face plate and is close to the fourth face plate, the air return opening is formed in the first face plate and is close to the third face plate, the air inlet is formed in the second face plate and is close to the fourth face plate, the air outlet is formed in the second face plate, and the heat exchange component is arranged between the first face plate and the second face plate. According to the technical scheme, the fast cooling device is low in power consumption and low in cost, and a condensation phenomenon cannot occur when electronic equipment is cooled.

A method for controlling air volume of an electric device to be constant, the device being adapted to exhaust or supply air, the method including: A) establishing M constant air volume control functions Qi=F(n) corresponding to M air volume points CFMi in the microprocessor of the system controller; B) allowing the microprocessor to receive or preset a target air volume IN-CFM; C) starting the motor, when the motor operates in a stable state, comparing M air volume points CFMi with the target air volume IN-CFM, and ensuring that the target air volume IN-CFM falls within two known air volume points CFMi and CFMi−1; D) using the two known air volume points CFMi and CFMi−1 to calculate a constant air volume control function Q0=F(n) corresponding to the target air volume IN-CFM by interpolation method; and E) controlling a motor parameter Q0 and a rotational speed n.

The invention relates to an area control method, device and system and an air conditioning system. The area control method comprises the steps that when adjusting areas requiring for opening an air valve exist, an air valve controller can obtain the total length of air pipes corresponding to all the adjusting areas at the moment, and obtain the static pressure of an air pipe unit required for thesimultaneous supply of air in the current number of adjusting areas according to the total length of the air pipes; and a static pressure change value is obtained by analyzing the static pressure of the air pipe unit and the corresponding preset static pressure, and the static pressure change value is sent to the air pipe unit, so that the air pipe unit conveniently carries out air supply regulation and corrects the air supply quantity of the air pipe unit at the moment according to the static pressure change value, and realizes the operation of supplying air for a user with constant air quantity. According to the scheme, the air supply quantity of each adjusting area can be constant, the situation that the air supply quantity is increased or decreased due to the changes of the air pipes for supplying air of the air pipe unit is avoided, and the control reliability is high.

The invention discloses a device for controlling the air supply volume of a purification system of a clean area. The device comprises an air conditioning cabinet, a static pressure sensor, a high-efficiency filter and a PLC or DDC system, wherein the air conditioning cabinet comprises a variable-frequency fan and is used for regulating and controlling the air supply volume, the static pressure sensor is used for detecting static pressure of each clean room, the high-efficiency filter is used for filtering air entering each clean room; and the PLC or DDC system is in signal connection with the air conditioning cabinet and the static pressure sensor and is used for adjusting the frequency of the variable-frequency fan according to the static pressure, detected by the static pressure sensor, of each clean room so as to regulate and control the air supply volume. The invention further relates to a method for controlling the air supply volume of the purification system of the clean area. The method is characterized in that the method adopts the device; and return air of the clean room is constant, and the air supply volume of the purification system of the clean area is controlled by associating the static pressure of the clean room with the frequency of the variable-frequency fan of the air conditioning cabinet. The device and the method have the advantages that the air supply volume of the system can be simply and effectively constant; and the ventilation rate of each clean room and the relative pressure difference between the clean rooms can be stabilized.

The invention relates to a refrigeration unit, which comprising a box, a partition plate, a refrigeration mechanism and an air adjusting plate, wherein the box is internally provided with an accommodating cavity, the partition plate is arranged in the accommodating cavity and divides the accommodating cavity into a food storing cavity and an air guiding cavity communicating with the exterior, an air inlet enabling the food storing cavity and the air guiding cavity to communicate is formed in the partition plate, the refrigeration mechanism is used for delivering cold air into the air guiding cavity, and the air adjusting plate is movably assembled in the box relative to the air inlet; the refrigeration mechanism delivers first refrigeration air with the first air speed when the food storing cavity is at the initial temperature, and delivers second refrigeration air with the second air speed when the food storing cavity is at the set temperature; the initial temperature is higher than the set temperature, and the first air speed is greater than the second air speed; and the air inlet area of the air inlet is adjusted correspondingly by the air adjusting plate according to the firstrefrigeration air and the second refrigeration air, and it is ensured that the air inlet quantity of the air inlet is always constant. The air speed is small under the situation of ensuring the constant air inlet quantity, thus evaporation of food moisture is reduced, and the 'dry consumption' phenomenon is reduced.

The invention relates to an air purifying device and a control method thereof. The control method includes: acquiring an air volume value and a noise value; before the noise value is larger than a target noise value, controlling an air supply module according to the air volume value and a first target air volume value to keep the air volume at an air supply port at the first target air volume value; after the noise value is larger than a target noise value, controlling the air supply module according to the noise value and the target noise value to keep noise generated by the air purifying device at the target noise value, and judging whether the air volume value is smaller than a second target air volume value or not; if the air volume value is smaller than the second target air volume value, judging that a filter module loses a filtering function. The air supply volume of the air purifying device can be controlled according to the noise value, constant air supply volume of the air purifying device can be guaranteed as far as possible, noise increasing of the air purifying device is inhibited as far as possible under a high-noise condition while large air supply volume is realized, and accordingly a comfortable living and working environment can be provided for users.

The invention relates to a fan filter unit with fixed surface air speed and controllable area. The fan filter unit comprises a device casing, the bottom of the device casing is provided with an air outlet, the top of the device casing is provided with a circular air suction port, a fan is arranged below the circular air suction port, a filter is arranged below the fan, and an air speed sensor is arranged at the center below the filter and is connected with a controller through a lead, wherein the controller is arranged on the top of the device casing and used for controlling rotation speed of the fan. The fan filter unit breaks through the conventional method of controlling air quantity by changing air speed via area fixing type, senses and monitors the air speed of the air outlet by means of the sensor and timely feeds the air speed back to the controller, and the controller can immediately transmits signals to enable rotary shafts on two sides of a box to rotate in or out to adjust the area of a windward side, so that air quantity can be changed, air speed can be stabilized, and airflow distribution can be constant.

The invention relates to an air valve device. The air valve device is arranged in a ventilation pipeline, and is used for adjusting the sizes of the air volume and the air speed of the air entering an air inlet which is arranged at the front end of the ventilation pipeline, so the air speed and the air volume of the air delivered from an air delivery port which is arranged at the back end of the ventilation pipeline are constant. The air valve device is characterized in that the air valve device is provided with an air sensing part, an adjusting part, a connecting part and a limiting part, wherein the air sensing part is arranged at the air delivery port, and is used for sensing the air volume and the air speed, the air sensing part comprises a fixing framework, a limiting framework, an air sensing framework, a distance adjusting unit and a thrust component, the adjusting part is arranged at one side, near the air inlet, of the inside of the ventilation pipeline, and is used for adjusting the air volume and the air speed, the adjusting part comprises a first rotary shaft, a plurality of blade components, a blade driving rod, a support framework, an air retaining plate, a rotary gear, an adjusting component and a thrust component, the connecting part is used for connecting the air sensing part with the adjusting part, and comprises a second cable and a steering pulley block, and the limiting part comprises a first limiting table, a second limiting table and a third limiting table.

The invention discloses an air volume detecting and adjusting device which comprises a smoke outlet channel, an air pressure detecting device, a plain-end air pressure sampling nozzle and an inclined-end air pressure sampling nozzle, and the smoke outlet channel is provided with a vertical detecting section; the plain-end air pressure sampling nozzle is provided with a first air inlet end and a first air outlet end, the first air outlet end is connected with the air pressure detection device, the first air inlet end extends into the vertical detection section, and the first air inlet end is provided with a first air inlet; a bevel wind pressure sampling nozzle is provided with a second air inlet end and a second air outlet end, the second air outlet end is connected with the wind pressuredetection device, the second air inlet end extends into the vertical detection section, the second air inlet end is provided with a second air inlet, and the second air inlet and the first air inlet are formed in the same horizontal plane. The air volume detecting and adjusting device is adopted in the water heater, under the control of a constant air volume detecting and adjusting method, the influence of atmospheric pressure changes caused by different environments, altitudes and regions can be avoided, pressure changes in the smoke channel can be detected in real time, and the combustion working condition is adjusted according to the actual situation.

The invention discloses an air pumping / supplying device and a control method thereof, wherein, the control method calculates the current target value of the DC bus bar through the target air volume and the actual air volume of the air extraction / supply equipment, adjusts the actual value of the DC bus bar current through the current target value of the DC bus bar, and adjusts the motor of the airextraction / supply equipment so as to make the actual air volume approach to the target air volume. Adjusting the output of the motor with the actual air volume and the target air volume can stably guarantee the actual air volume of the equipment, keep the constant air volume of the equipment, and reduce the influence of the running state, the running environment and the performance of the equipment on the use effect.

The invention discloses an assembly line weighing and packaging table with a chain type plate scale. The assembly line weighing and packaging table comprises a support, a transmission mechanism, at least two groups of weighing mechanisms, and at least two groups of pressure maintaining assemblies, wherein the transmission mechanism is arranged on the support, the at least two groups of weighing mechanisms are arranged at the positions of the middle of the transmission mechanism, the weighing mechanisms weigh heavy objects on the transmission mechanism through air pressure change, and the at least two groups of pressure maintaining assemblies keep the air amount in the at least two groups of weighing mechanisms unchanged. The assembly line weighing and packaging table is scientific, reasonable and safe and convenient to use, the weighing mechanisms weigh the heavy objects through monitoring of the air pressure change through air pressure sensors, standby air pressure sensors are arranged on the weighing mechanisms, when the used air pressure sensors are damaged, the standby air pressure sensors are started for use immediately, when the two groups of sensors are replaced, the air amount in the weighing mechanisms is kept unchanged by the pressure maintaining assemblies, and weighing errors caused by reduction of the air amount in the replacing process are prevented.

The invention discloses a constant-air-volume motor drive control method for a fan. The constant-air-volume motor drive control method comprises the following steps: determining Duty 0, N0, I0 and CFM0, keeping Duty0 unchanged, and blocking the sectional area of an air flue opening; respectively obtaining Nx, Ix and CFMx under different Sx values while an initial sectional area is S0 and an effective ventilation sectional area is Sx; obtaining a stepless speed regulation datum reference curve; enabling the CFMX to be identically equal to CFM0 by regulating Dutyx, thereby obtaining current Nx, Ix and Dutyx; obtaining a constant-air-volume regulating datum curve; setting Dutyx as Duty0, and measuring Nx and Ix; according to the stepless speed regulation datum reference curve and the constant-air-volume regulating datum curve, correcting a duty ratio to be Dutyx, and enabling air volume CFMx of an air outlet to be identically equal to CFM0. In case of no sensor feedback, the control method realizes intelligent control of constant air volume of the fan, and improves the reliability of motor control.

A method for controlling air volume of an electric device to be constant, the device being adapted to exhaust or supply air, the method including: A) establishing M constant air volume control functions Qi=F(n) corresponding to M air volume points CFMi in the microprocessor of the system controller; B) allowing the microprocessor to receive or preset a target air volume IN-CFM; C) starting the motor, when the motor operates in a stable state, comparing M air volume points CFMi with the target air volume IN-CFM, and ensuring that the target air volume IN-CFM falls within two known air volume points CFMi and CFMi−1; D) using the two known air volume points CFMi and CFMi−1 to calculate a constant air volume control function Q0=F(n) corresponding to the target air volume IN-CFM by interpolation method; and E) controlling a motor parameter Q0 and a rotational speed n.

The invention relates to a noise-based control method for an air purification device and an air purification device. Specifically, the control method includes: using the noise detection module to detect the noise generated by the air purification device to obtain the noise value; and using the air volume detection module to detect the air volume at the air outlet to obtain the air volume value; after the noise value is greater than the target noise value for the Nth time , control the air supply module according to the air volume value and the Nth target air volume value, so that the air volume at the air supply port remains at the Nth target air volume value, N is a natural number greater than or equal to 1; and when N is greater than 1, the Nth target The air volume value is less than the N‑1th target air volume value. The air supply volume of the air purification device can be controlled according to the noise value, which can ensure a constant air supply volume of the air purification device as much as possible, and can make the noise generated by the air purification device lower, providing users with a comfortable living and working environment.

The invention relates to an air purifying device and a control method thereof. The control method includes: acquiring an air volume value and a noise value; before the noise value is larger than a target noise value, controlling an air supply module according to the air volume value and a first target air volume value to keep the air volume at an air supply port at the first target air volume value; after the noise value is larger than a target noise value, controlling the air supply module according to the noise value and the target noise value to keep noise generated by the air purifying device at the target noise value, and judging whether the air volume value is smaller than a second target air volume value or not; if the air volume value is smaller than the second target air volume value, judging that a filter module loses a filtering function. The air supply volume of the air purifying device can be controlled according to the noise value, constant air supply volume of the air purifying device can be guaranteed as far as possible, noise increasing of the air purifying device is inhibited as far as possible under a high-noise condition while large air supply volume is realized, and accordingly a comfortable living and working environment can be provided for users.

The invention discloses a ventilation system capable of achieving a constant air outlet state and a ventilation unit, and belongs to the technical field of ventilation systems. The ventilation system comprises a ventilation host, a fresh air inlet channel and a dirty air outlet channel are arranged on the two sides in the ventilation host respectively, draught fans are fixedly installed on the rear side in the fresh air inlet channel and the front side in the dirty air outlet channel respectively, a current detection unit which is used for detecting the current values of the draught fans and a control unit which is used for judging and adjusting the current values of the draught fans are further fixedly installed on one side of the ventilation host, and a plurality of filter screens are installed on the front side in the fresh air inlet channel at equal intervals through a lower filter screen installation frame and an upper filter screen installation frame and used for carrying out multiple filtering on impurities in fresh air. According to the ventilation system, the ventilation quantity of fresh air entering the plurality of filter screens in the channel is maintained through washing, the current values of the draught fans are detected and judged, then the power of the draught fans is adjusted to be constant, and finally the fresh air outlet quantity of the ventilation system is constant.

An outdoor electronic newspaper reading column and its rapid heat dissipation device, the heat dissipation device includes: a first panel and a second panel opposite, a third panel and a fourth panel opposite, and the third panel and the fourth panel are connected to the The first panel is adjacent to the second panel; the air outlet located on the first panel and close to the fourth panel and the return air outlet located on the first panel and close to the third panel; The second panel, the air inlet close to the fourth panel and the air outlet provided on the second panel; a heat exchange component arranged between the first panel and the second panel. The rapid heat dissipation device of the technical solution of the present invention has low power consumption and low cost, and no condensation phenomenon occurs when the electronic equipment is radiated.

The invention relates to a noise-based control method of an air purification device and an air purification device. Specifically, the control method comprises the following steps: detecting the noisegenerated by the air purification device by using a noise detection module to obtain a noise value; detecting the air volume at the air supply port by using an air volume detection module to obtain the air volume value; after the noise value is greater than the target noise value for the Nth time, controlling an air supply module according to the air volume value and the Nth target air volume value, so that the air volume at the air supply port is maintained at the Nth target air volume value, and N is a natural number greater than or equal to 1; and when N is greater than 1, the Nth target air volume value is less than the Nth-1 target air volume value. The air supply volume of the air purification device can be controlled according to the noise value, the air supply volume of the air purification device can be ensured to be constant as far as possible, the noise generated by the air purification device can be reduced, and a comfortable living and working environment can be provided for the user.

The invention relates to a negative feedback type air valve device. The negative feedback type air valve device is arranged in a ventilation pipeline, and is used for adjusting the sizes of the air volume and the air speed of air entering an air inlet which is arranged at the front end of the ventilation pipeline, so the air volume and the air speed of air delivered from an air delivery port which is arranged at the back end of the ventilation pipeline are constant. The negative feedback type air valve device is characterized in that the negative feedback type air valve device is provided with a first adjusting part, a push-pull part, an air sensing part and a guide part, wherein the first adjusting part is used for adjusting the air volume and the air speed, and comprises a plurality of blade components, a left mounting plate, a right mounting plate and a transmission plate, each blade component comprises a blade, two transmission shafts and a connecting rod, the push-pull part is used for pushing and pulling the transmission plate to drive the blade components to be simultaneously opened and closed, the air sensing part is used for sensing the air volume and the air speed of the air passing through the first adjusting part, and driving the push-pull part to push and pull the transmission plate, the air sensing part comprises a wing-shaped float and a float connecting component, and the guide part is used for enabling the float connecting rod to directionally move in the vertical direction.

A control method of constant-air-volume split fresh air comprises the following steps of (1) starting a fresh air fan, and setting a running air volume; (2) calculating a fresh air volume and an exhaust air volume ratio; (3) adjusting the rotating speed of each fan in a fresh air system according to the ratio of the fresh air volume; (4) inspecting, by the sensor, the cleanliness of a filter screen, wherein if the cleanliness of the filter screen meets a set value, the air inlet fan works normally; (5) detecting the air inlet amount of an air inlet fan, wherein if the set air volume is met, the fan of the fresh air works normally, and if the set air volume is not met, a signal is sent to an air feeder, and the rotating speed of the air feeder is adjusted; (6) if the cleanliness of the filter screen does not meet the set value in the step (4), adjusting the rotating speed of the air inlet fan and the rotating speed of the air feeder at the same time; and (7) adjusting the rotating speedof the exhaust fan according to the proportion of the exhaust air volume. The air volume can be more accurately controlled by the control method, and the power of a fresh air system can be effectively reduced.