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 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 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 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 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 an assembly line weighing and packaging platform with a chain plate scale. The assembly line weighing and packaging platform includes a bracket, a transmission mechanism, at least two groups of weighing mechanisms, and at least two groups of pressure maintenance components. Mechanism, at least two groups of weighing mechanisms are arranged in the middle of the transmission mechanism, and the weighing mechanism can realize the weighing of the heavy objects on the transmission mechanism through the change of air pressure, and at least two groups of the pressure maintenance components make at least two groups of the The air volume in the weighing mechanism remains unchanged. The present invention is scientific and reasonable, and is safe and convenient to use. The weighing mechanism realizes the weighing of heavy objects through the monitoring of air pressure changes by the air pressure sensor. The weighing mechanism is equipped with a spare air pressure sensor. When the used air pressure sensor is damaged, the spare air pressure sensor will be activated immediately. When the two sets of sensors are replaced, the pressure maintenance component will keep the air volume in the weighing mechanism constant, preventing weighing errors caused by the reduction of air volume during the replacement process. appear.

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.

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 an adjusting device of a fan coil, the fan coil and an adjusting method thereof, and relates to the technical field of air conditioning equipment. The problem that a fan of a fan coil and a water valve in the prior art need to be frequently started and stopped and the indoor temperature fluctuation range of an air conditioner room is large are solved. The adjusting device comprises a detection module, a calculation module, a judgment module and an adjustment module, wherein the detection module is used for detecting the real-time temperature of the air conditioner roomand sending the real-time temperature to the calculation module; the calculation module is used for comparing the real-time temperature with a set temperature and sending a comparison result to the judgment module; the judgment module judges whether the adjustment module is operated or not on the basis of the comparison result; and the adjustment module adjusts the refrigerating capacity and / or heating capacity of the fan coil on the basis of an instruction of the judgment module. The adjusting device adjusts the flow of the fan coil and / or the flow path of the fan coil to adjust the refrigerating capacity and / or heating capacity of the fan coil, so that the indoor temperature is kept constant, and the use comfort of a fan coil air conditioning system is improved.

This application relates to an area control method, device, system and air conditioning system. When there is an adjustment area that needs to open the damper, the damper controller can obtain the total length of the air duct corresponding to each adjustment area at this time, and according to the wind Total Duct Length Gets the static pressure of the duct unit required to deliver air to the current number of zones simultaneously. Then analyze the static pressure of the air duct unit and the corresponding preset static pressure to obtain the static pressure change value and send it to the air duct unit, so that the air duct unit can adjust the air supply according to the static pressure change value, and correct the air delivery of the air duct unit at this time. The air volume realizes the constant air volume air supply operation for the user. Through the above solution, the air supply volume to each area can be kept constant, and the air supply volume will not increase or decrease due to the change of the air supply duct of the air duct unit, which has the advantage of strong control reliability.