102 results about "Constant air volume" patented technology

The heat recovery fresh air conditioning unit comprises a total heat recovery fresh air conditioning unit body and a control cabinet, the total heat recovery fresh air conditioning unit body is formed by splicing an upper exhaust box body and a lower air supply box body, and an exhaust side bypass electric air valve and a heat recovery device are sequentially arranged in the upper exhaust box body in the flowing direction; a first pressure difference sensor assembly and an exhaust enthalpy value sensor are distributed in the upper exhaust box, a constant air volume device, a heat recovery device, an air supply side bypass electric air valve and an air feeder are arranged in the lower air supply box body in the flowing direction, and a second pressure difference sensor assembly, a fresh air enthalpy value sensor and a fresh air enthalpy value sensor after heat recovery are distributed in the lower box body. And the control cabinet realizes the operation states of the heat recovery device and the bypass electric air valve through judgment according to the pressure difference measured by the pressure difference sensor assembly and the enthalpy value measured by the enthalpy value sensor in combination with the frequency value and the electricity consumption of the fan. Compared with a traditional control method, the method is easier to implement, the energy-saving effect is better, and the indoor air quality is higher.

Electronic components related to constant air volume control are collected on a motor control substrate (18), which is a motor-side substrate, and a target air volume acquisition unit (27) belonging to a motor unit (6) and a target air volume switching unit (17) belonging to a power source unit (8) are connected by a connector (32) so as to be capable of communicating with each other. Provided is a blower device in which information relating to a target air volume Qs set by the target air volume switching unit (17) of the power source unit (8) is transmitted to the target air volume acquisition unit (27) of the motor unit (6) via the connector (32), whereby air volume constant control is made possible in the motor control substrate (18).

The invention provides a constant-air-volume operation method and device of an indoor fan, an air conditioner and a storage medium, the air pipe static pressure and the target air volume are obtained, the air pipe static pressure is the static pressure obtained based on the operation rotating speed and the operation power, the target rotating speed is obtained based on the air pipe static pressure and the target air volume, and the operation rotating speed is adjusted to be the target rotating speed. Thus, debugging personnel do not need to manually set the static pressure, the corresponding air pipe static pressure can be obtained based on the operation rotating speed and the operation power, equivalently, the air pipe static pressure can be automatically matched according to different air pipe lengths, manpower and time are saved, and errors caused by manual adjustment can be avoided. Therefore, the problem that the air outlet effect of the indoor fan is poor due to improper design or installation errors of an air pipe of the indoor fan can be avoided, it can be guaranteed that the indoor fan operates in a constant air volume mode under the condition that the target air volume is not changed, the air outlet effect of the indoor fan is guaranteed, and the use experience of a user is improved.

Provided is an air-conditioning indoor unit. The air-conditioning indoor unit includes a plurality of centrifugal wind wheels, a motor drivingly connected to the plurality of centrifugal wind wheels, an electric control box disposed in an axial direction of the plurality of centrifugal wind wheels, and an evaporator disposed in a radial direction of the plurality of centrifugal wind wheels and obliquely disposed relative to a height direction of the air-conditioning indoor unit. By providing the plurality of centrifugal wind wheels and driving the plurality of centrifugal wind wheels by a same motor, when a size of the air-conditioning indoor unit is large, a constant air volume may be outputted. The electric control box is located in the axial direction of the centrifugal wind wheel and far away from the evaporator, to prevent the electric control box from being splashed by condensed water. In addition, since there is a large space when the centrifugal wind wheel is provided, the electric control box is located in the axial direction of the centrifugal wind wheel to more facilitate an arrangement of the electric control box. The evaporator is disposed obliquely relative to the air-conditioning indoor unit. In this way, a thickness of the air-conditioning indoor unit can be reduced, and heat exchange efficiency can be improved.

The utility model relates to the technical field of workshop air conditioning systems, in particular to an air conditioning system for a printing workshop, which comprises an air conditioning unit and a controller, the air conditioning unit sequentially comprises a fresh air section, a primary filter section, a primary air return section, a surface cooling disc section, a secondary air return section, a fan section, a flow equalizing section, a medium-efficiency filter section and a humidifying air outlet section; the fresh air section is connected with a fresh air pipe, the fresh air pipe is provided with a first electric valve electrically connected with the controller, the humidification air outlet section communicates with the printing workshop through an air supply pipe, and a first pressure sensor electrically connected with the controller is arranged in the air supply pipe. A second pressure sensor electrically connected with the controller is arranged in the printing workshop, and the controller is used for controlling the air supply amount of the fan section to keep constant according to signals of the first pressure sensor and controlling the opening degree of the first electric valve on the fresh air pipe to keep constant pressure according to signals of the second pressure sensor. The combined type air conditioning unit can solve the technical problem that an existing combined type air conditioning unit is large in energy loss.

The invention relates to the technical field of air conditioners, particularly provides an air conditioner constant air volume control method, electronic equipment, an air conditioner and a storage medium, and aims to solve the technical problem of how to carry out constant air volume control on the air conditioner. In order to achieve the purpose, the method comprises the steps of obtaining the power and / or current of a fan, obtaining the actual air volume of an air outlet based on the power and / or current of the fan, judging whether the actual air volume is the same as the set air volume or not, and selectively adjusting the rotating speed of the fan based on the judgment result. Through the implementation mode, the air volume can be reversely checked according to the running power and / or current of the fan, and the air speed is timely adjusted when the actual air volume is different from the set air volume, so that the constant air volume control of the air conditioner is realized, and the use embodiment of a user is improved.

The invention discloses a constant air volume adjusting device for an air conditioner, and relates to the technical field of air conditioners, the constant air volume adjusting device comprises an air conditioner body, the front surface of the air conditioner body is fixedly connected with a dust baffle, the front surface of the air conditioner body is provided with an air outlet cylinder, and the front surface of the air outlet cylinder is provided with a shielding device; the front face of the shielding device is fixedly connected with an adjusting device and a sealing device. By arranging the shielding device, when the wind blocking blades are wound to a preset degree by the winding roller, the air outlet barrel is completely opened, if the air volume needs to be adjusted, a first motor only needs to be started reversely, the winding roller rotates reversely, a hinged plate is released, and the hinged plate drives the wind blocking blades to unfold while sliding in the shell; therefore, it is ensured that the air conditioner body can achieve maximum air volume output, the situation that the air speed is limited due to the influence of air resistance in a specific application scene is avoided, and the air supply capacity and the overall operation efficiency of equipment are improved.

The application belongs to the technical field of heating, ventilation and air conditioning, and particularly relates to a high-strength constant air volume composite air pipe system suitable for a power control room, which comprises a metal inner lining layer, a peripheral reinforcing layer and a gradient thermal expansion transition layer between the two, a sliding interface is embedded in the transition layer or the interface, the transition layer is composed of a high-molecular elastic matrix and radially non-uniformly distributed reinforcing fibers, a linear gradient transition of a thermal expansion coefficient is realized, the sliding interface contains arrayed friction-reducing microbeads, axial displacement compensation is allowed, the system is also integrated with a constant air volume control assembly to guarantee air volume accuracy, through the above structure, thermal stress concentration is effectively eliminated, cracks are inhibited, and air tightness and control stability are maintained.

The invention relates to a mining self-adaptive constant-air-volume control air supply device without sensor detection, which is characterized by comprising a main machine rear cover (2), a fan rear cover (4), a fan (3), a filter device (110) and a main machine front cover (1) which are sequentially connected together, a vibration motor (6) and an electric control board (8) are arranged on two sides of the fan (3), and the filter device (110) is arranged on the main machine front cover (1). The fan (3), the electric control board (7) and the vibration motor (6) are fixed in an internal space set by the main machine front cover (1) through screws; the LED light guide plate (5) is mounted at the top of the fan (3), and a display control plate (8) is further mounted on the LED light guide plate (5); a battery box cover (15), a lithium battery (16) and a battery box (14) are sequentially mounted at the bottom of the fan (3) downwards; a charging interface is formed in the side surface of the battery box (14); due to the design of high filtration, miniaturization, light weight and portability, the equipment is suitable for being worn by individual protection equipment, and is convenient and practical.

The invention discloses a constant air volume control method and device, air conditioning equipment and a medium, the method is applied to the air conditioning equipment which is provided with a fan and an air swing mechanism at an air outlet, and the method comprises the steps that a mapping relation is established for the current target air volume, the mapping relation represents the relation between the swing angle parameter under the current target air volume and the fan rotating speed; in the operation process of the air swinging mechanism, the current parameter value of the air swinging angle parameter is obtained according to a preset control period; obtaining a target rotating speed corresponding to the current parameter value according to the mapping relation; and adjusting the rotating speed of the fan to the target rotating speed. According to the invention, the technical problem of unstable constant air volume control caused by the operation of the air swinging mechanism at the air outlet of the air conditioning equipment is solved.

The present invention discloses a method for monitoring and controlling the air flow rate of a large-scale blast furnace blower unit, comprising a blower unit, an air supply duct, a blast furnace, a check valve, a flow monitor and an air supply valve. Two air supply temperature monitoring points A and B, two air supply pressure monitoring points C and D, and two air supply differential pressure monitoring points E and F arranged on the flow monitor are arranged on the air supply duct between the check valve and the flow monitor. The present invention is provided with a dual-loop measurement, wherein the measurement signal of one loop is used for air supply flow rate monitoring and constant air volume automatic control operation of the blower unit, and the measurement signal of the other loop is used for air supply flow rate monitoring and signal comparison with the control system. By setting a comparison difference control range, it is ensured that the instantaneous fluctuation amplitude of the air supply flow rate does not exceed 4% of the actual flow rate, which can effectively avoid the occurrence of large fluctuations in the blast furnace air supply and serious impact on production due to various abnormalities or failures of the air supply flow rate measurement circuit, thereby ensuring the stable operation of the blower unit and safe production of the blast furnace.

The utility model discloses a constant air volume valve, and relates to the technical field of constant air volume valves. The constant air volume valve comprises a connecting air duct and a quantitative assembly, the quantitative assembly comprises a mounting structure and an adjusting structure, the mounting structure is located on the adjusting structure, the adjusting structure comprises a mounting plate, a rotating shaft, a gear, a toothed plate and a micro push rod, the outer wall of the connecting air duct is fixedly connected with the mounting plate, the toothed plate is arranged on the mounting plate, and the rotating shaft is rotationally mounted on the mounting plate; the outer wall of the rotating shaft is fixedly sleeved with a gear, and the gear is meshed with the toothed plate. According to the device, air in the connecting air duct can be quantified, and compared with traditional manual adjustment, the adjustment work of the device is more accurate, the two hands of workers are liberated, the requirement for manual intervention is reduced, the automation level of the system is improved, the workload of operators is reduced, the stability of the air flow is ensured, and the working efficiency is improved. Therefore, the comfort of the indoor environment is improved.

The present invention provides a method and device for correcting the air volume of an indoor unit of an air conditioner and a multi-connected air conditioner unit. The method includes: presetting a preset rotation speed of the indoor unit of the air conditioner; setting a sampling rotation speed F s , collecting the corresponding sampling powers when the indoor unit of the air conditioner operates in different static pressure intervals at the sampling rotation speed F s and under the condition of a constant air volume, which are recorded as a sampling power data set W s ; operating the indoor unit of the air conditioner at the sampling rotation speed F s , and collecting in real time the actual power W s when the indoor unit of the air conditioner operates at the sampling rotation speed F s '; calculating the power deviation rate e of the indoor unit of the air conditioner according to the sampling power data set W s and the actual power W s '; comparing to obtain the minimum power deviation rate e min , and obtaining the actual static pressure value and the preset rotation speed F min corresponding to the actual static pressure value according to the sampling power corresponding to the minimum power deviation rate e x . The present invention can timely and accurately correct the final duct static pressure affected by various factors, adjust the fan rotation speed, improve the user experience, avoid energy waste, and achieve the purpose of energy saving.

This invention discloses an automatic fuel feeding control strategy for a biomass circulating fluidized bed boiler, solving the problem of how to automatically control the rational supply of biomass fuel in the furnace to ensure stable boiler operation. This invention uses changes in the oxygen content of the flue gas at the boiler tail end to infer changes in the furnace fuel feed. Under the premise of constant air volume, an increase in oxygen content indicates a decrease in biomass fuel feed, while a decrease in oxygen content indicates an increase in biomass fuel feed. A PID control module is established with the oxygen content of the flue gas at the boiler tail end as the input value. The output value of this PID control module is used to adjust the frequency of the fuel feed screw feeder in the biomass circulating fluidized bed boiler. Furthermore, considering the unstable characteristics of biomass fuel, when the oxygen content in the furnace reaches a limit, the feedforward control mode and the lockout function mode of the PID controller are fully utilized to achieve stable boiler operation.

The utility model belongs to the technical field of air conditioners, and particularly relates to an adjustable air supply outlet and an air conditioner. The adjustable air supply outlet comprises an air duct with an air outlet and flow guide pieces which are evenly arranged in the circumferential direction of the air duct and can be close to or away from the center of the air outlet. The flow guide piece can define a flow guide channel so as to guide airflow flowing out of the air outlet. When the flow guide piece does not shield the airflow flowing out of the air outlet, the air outlet channel is the inner wall of the air duct; when the flow guide piece moves to shield part of the air outlet, the air outlet channel is jointly composed of a flow guide channel defined by the inner wall of the air duct and the flow guide piece, and the flow guide channel is provided with a small tail end. The flow guide part is movably arranged, so that the shielding degree can be adjusted, namely, the flow guide channel is adjustable, and the air speed can be adjusted under the condition that the air volume is not changed.

This application belongs to the field of production control technology, specifically relating to an environmental control system, method, and storage medium for production spaces. It includes an air supply module, an indoor air treatment module, an exhaust module, and a control module. The air supply module provides fresh air to the production space; the indoor air treatment module handles the heat and humidity load of the circulating air within the production space; the exhaust module exhausts air from the production space; and the control module controls the air supply module to operate at a constant airflow, and adjusts the exhaust module's airflow by acquiring the actual supply and exhaust volumes to create a stable negative pressure within the production space. This system effectively solves the application bottlenecks of traditional technologies in special protection scenarios. The dual-system architecture significantly reduces reliance on large ducts and ventilation trenches, adapts to space constraints imposed by thick wall structures, and effectively prevents the leakage of potentially hazardous substances.

The application relates to the technical field of biosafety equipment control, and particularly provides a biosafety cabinet constant air volume intelligent control method and system, aiming to solve the technical problem of error control of an existing scheme under a shielding working condition. To this end, the biosafety cabinet constant air volume intelligent control method comprises the following steps: collecting an operation state signal of a biosafety cabinet; determining a multi-dimensional state feature vector based on the operation state signal; obtaining a working condition judgment result based on the state feature vector; and controlling the biosafety cabinet to maintain a constant working area air volume based on the working condition judgment result. In this way, the shielding working condition of the biosafety cabinet can be accurately identified without adding additional hardware sensors, so that low-cost constant air volume intelligent control is realized.

The present application relates to the technical field of range hood, and discloses a range hood wind speed self-adaptive adjusting method, a plurality of fan currents and a plurality of fan rotating speeds are one-to-one corresponding, in the working process, the range hood works under different fan currents; and the increasing trend of oil fume concentration is judged, and an oil fume concentration increasing threshold is set for the corresponding fan current, in the constant current working process of the fan, when the increasing value of the oil fume concentration relative to the reference oil fume concentration exceeds the oil fume concentration increasing threshold, the fan works under the next larger fan current for constant current. The range hood wind increasing of the present application can be divided into multiple stages, under each stage, the working mode of constant current and constant air volume within a certain range is realized, and the wind increasing model can be intelligently corrected along with the increasing trend of the oil fume concentration, the wind resistance sensitivity is effectively improved, and the smoke exhaust effect can be further improved when the exhaust pressure of the public flue is large and the smoke exhaust is not smooth or the flue pressure suddenly changes.

The present application relates to a kind of multifunctional constant air volume valve, including valve body, the adjusting blade being placed in valve body and the rotary filter drying structure being placed in the position of the inlet end of valve body;When air flow enters the inlet end of valve body, rotary filter drying structure is free circumferential rotation under the action of air flow, and rotary filter drying structure is mixed with the impurity and moisture of air flow and adsorbs its impurity and moisture, and the air flow after purification is discharged to the outlet end of valve body by adjusting blade;Rotary filter drying structure includes annular frame arranged in the inner wall of valve body, the air inlet end surface of annular frame has a plurality of equidistant circumferential distribution rotary guide fan blade, and there is sealed ball auxiliary rotating component between the outer wall of annular frame and the inner wall of valve body.The present application has the following advantages: improve purification quality, reduce the resistance of valve body front end, while avoiding affecting the opening degree of valve body blade, ensure the connection stability when constant air volume valve is used.

The invention discloses a pressure-independent type constant air volume valve and a design method thereof. The pressure-independent type constant air volume valve comprises a valve body of a tubular structure, a valve element shaft which is fixedly installed in the valve body and is concentric with the valve body, and a pre-tightening spring which is arranged on the periphery of the valve element shaft in a sliding and sleeving mode, wherein the end, close to an outlet of the valve body, of the pre-tightening spring is fixedly connected with the valve element shaft, and the pre-tightening force is adjustable. The valve element is installed on the periphery of the valve element shaft in a sliding mode, located on the side, close to an inlet of the valve body, of the pre-tightening spring and extruded by the acting force of fluid to push the pre-tightening spring, and the two baffles are symmetrically arranged relative to the valve element, located on the side, close to an outlet of the valve body, of the valve element and fixedly installed in the valve body. The valve element is of a hemispherical shell structure, and the arc convex face of the valve element faces the inlet of the valve body. According to the pressure-independent constant air volume valve, flow can be kept constant within a wide pressure difference range under the condition that no external source power exists, and the pressure difference range of the pressure-independent constant air volume valve can be adjusted by adjusting the pre-compression amount of the pre-tightening spring.

The utility model relates to an air handling unit which comprises a unit shell, an evaporator is arranged in the unit shell and divides the unit shell into a left part and a right part, a high-static-pressure air supply fan is installed in the unit shell located at the left part, and an air return filter screen is installed in the unit shell located at the left end part. The evaporator is responsible for heating or cooling air, the high-static-pressure air supply fan is responsible for uniformly supplying the heated or cooled air into a room, and the return air filter screen ensures that the air entering the unit is clean, further purifies the air and provides clean air for the evaporator; a constant-air-volume exhaust fan and a sensible heat exchanger on the left part of the unit shell are used for carrying out heat exchange treatment on exhausted air, part of heat or cold is recycled, and the energy utilization efficiency is improved; and the fresh air filter screen and the fresh air fan are responsible for introducing fresh air and carrying out the same heat exchange treatment on the fresh air, so that the indoor air quality is ensured.

The application relates to a constant air volume control method, device and equipment of an air conditioning unit and a computer readable medium. The method comprises the following steps: collecting a first real-time static pressure difference value before and after an evaporator of the air conditioning unit; in the case that the difference between the first real-time static pressure difference value and a first preset reference difference value exceeds a predetermined range, adjusting the real-time rotating speed of a fan of the air conditioning unit until the difference between the first real-time static pressure difference value and the first preset reference difference value is within the predetermined range, and maintaining the current rotating speed for constant air volume output, wherein the first preset reference difference value is set for the evaporator in advance. Through detection of the static pressure difference value before and after the evaporator and closed-loop adjustment of the rotating speed of the fan with the preset reference difference value as the target, the technical problem that the existing constant air volume control scheme cannot realize accurate and stable control of the circulating air volume of the air conditioner is solved.

The invention provides a stepless constant air volume control method and system, electronic equipment and a storage medium, is suitable for an air conditioner, and periodically collects a current power value and a current rotating speed of the air conditioner; determining a first air volume value group according to a preset air pressure value group and the current rotating speed; the preset air pressure value group comprises a plurality of preset air pressure values, and the first air volume value group comprises a first air volume value corresponding to each preset air pressure value; determining a second air volume value group according to a preset air pressure value group and the current power value; the second air volume value group comprises a second air volume value corresponding to each preset air pressure value; determining an actual air pressure value of the air conditioner according to the first air volume value and the second air volume value corresponding to each preset air pressure value, and determining an actual air volume value of the air conditioner according to the actual air pressure value; determining a target rotating speed of the air conditioner according to the actual air pressure value, the current actual air volume value and the target air volume value; and if the target rotating speed is not consistent with the current rotating speed, adjusting the rotating speed of the air conditioner according to the target rotating speed to enable the air volume value output by the air conditioner to approach the target air volume value.

The invention relates to the technical field of intelligent air conditioners, and discloses a method and device for controlling a duct type air conditioner, the air conditioner and a storage medium. The method comprises the steps that under the condition that it is determined that the ducted air conditioner operates in a constant air volume mode with the current set air volume, the initial static pressure of the ducted air conditioner is determined through one-time or multiple-time constant speed control over a fan module, and the set rotating speeds corresponding to the constant speed control are sequentially increased; determining a target rotating speed corresponding to the initial static pressure according to a current rotating speed static pressure fitting relation corresponding to the current set air volume; and according to the target rotating speed, a fan module of the ducted air conditioner is controlled to operate. Therefore, the application scene of constant air volume control of the ducted air conditioner is expanded, and the performance of the air conditioner is improved.

The utility model discloses a constant air volume valve adapting to multiple working conditions, which relates to the technical field of valves, and comprises a valve body, a valve core, a valve core and a valve core, the filter unit is arranged at the air outlet of the valve body and comprises C-shaped guide rails arranged below the inner walls of the two sides of the valve body, hinge rods arranged in the C-shaped guide rails, I-shaped blocks arranged on the C-shaped guide rails, a turnover frame arranged between the hinge rods, a filter screen arranged in the turnover frame and a locking assembly arranged on the surface of the upper end of the filter screen. The utility model has the beneficial effects that the filter screen can be completely disassembled and assembled efficiently and quickly, the opening and closing of the filter screen are time-saving and labor-saving, the use requirements of the filter screen under different environments and different working conditions are met, and the firmness of the filter screen under screw installation and the convenience in disassembly and assembly of a magnetic suction type filter screen are also considered.

This invention discloses an airflow control method, device, storage medium, and air conditioner, belonging to the field of air conditioner control technology. When the air conditioner is in swing mode, this invention obtains the current air outlet area of ​​the air conditioner; determines the air outlet area difference based on the current air outlet area and a preset air outlet area; determines the airflow difference based on the air outlet area difference; and adjusts the fan speed of the air conditioner based on the airflow difference. By determining the airflow difference through the air outlet area difference during the air conditioner's swing process and adjusting the fan speed based on the airflow, the airflow of the air conditioner during the swing process remains constant. This constant airflow ensures stable noise during the air conditioner's vertical swing, improving the user experience. Furthermore, regardless of whether it is cooling or heating mode, the vertical swing angle is twice as large as that of existing air conditioners, improving room temperature uniformity.

The present invention belongs to the field of system control, and provides a constant air volume control method and system for an air conditioner fan system. A first machine learning model is used to predict environmental parameters, and the environmental parameters include temperature, humidity, and duct pressure; PID controller parameters are determined based on the predicted environmental parameters; based on the current system error and the predicted PID controller parameters, the air conditioner control parameters are dynamically adjusted; the system state is monitored in real time, and a feedback mechanism adjusts the control signal to maintain the set air volume target. The above solution can efficiently perform constant air volume control of the air conditioner fan system.

The utility model discloses a fresh air machine with constant air volume, which relates to the technical field of fans and comprises a machine body, a support plate is arranged at the lower end of the machine body, an air outlet pipe is arranged at one end of the machine body, an adjusting pipe is fixedly arranged at one end of the air outlet pipe, and a mounting seat is fixedly arranged on the upper side of the outer surface of the adjusting pipe. The constant-air-volume fresh air ventilator comprises a mounting base, an adjusting box is detachably arranged at the upper end of the mounting base, a worm is rotationally arranged between the inner walls of the two sides of the adjusting box, a motor is arranged at one end of the adjusting box, the output end of the motor penetrates through the adjusting box and is fixedly connected with the worm, and the outer surface of the worm is connected with a worm gear in a meshed mode. The air volume can be accurately adjusted, more appropriate fresh air volume can be provided for different use scenes such as rooms with different areas and different air quality requirements, and energy waste is avoided while the indoor air quality is improved.

The application discloses a kind of based on target speed dynamic compensation blast motor control method and system, it is first to collect the original sampling data of blast motor, and extract out key features such as quadrature-axis current, real-time speed and bus voltage by characteristic decoupling.Then, based on the dynamics correlation of quadrature-axis current and real-time speed, dynamically inverse the real-time aerodynamic flow resistance coefficient of current gas path system.Subsequently, by comparing real-time and calibration flow resistance coefficient to determine resistance deviation ratio, and using the ratio to adaptively correct the reference speed set by user, obtain the compensation target speed to maintain constant air volume.Based on this, closed-loop operation is carried out in combination with speed deviation, and bus voltage feedforward compensation and space vector modulation are introduced to generate control signals for driving inverters.In this way, the influence of filter aging or damper switching on air duct resistance fluctuation can be effectively eliminated, and precise control of constant air volume of blast motor under variable load conditions can be realized.

The utility model discloses an integrated constant air volume pressure difference controller, including body mechanism and setting in body mechanism one side, through the way of clamping the communication cable close to the wiring terminal, reduce the cable body swing amplitude, guarantee the location mechanism of close degree of connection, the location mechanism includes the screw rod of screwing on the one side symmetry of casing and set, complete the clamping limit of cable body, finally will each compression ring respectively wear into the outside of limit rod bottom end, rotate compression ring and make it rise to push gasket fully extrude screw rod bottom's position, after fixing the height of each limit rod, clamping installation back seal plate, in the long time's use process, when communication cable shakes under external force, because the part of cable body close to the wiring terminal is pressed and clamped, its shaking degree will reduce greatly, thereby effectively reduce the situation that the communication cable is loose at the wiring terminal connection place due to the cable body shaking, guarantee the stability of communication.