181 results about "Constant air volume" patented technology

The invention discloses a system and a method for controlling a range hood capable of outputting constant air volume. The system comprises a controller; the controller is connected with a user control panel, a speed sensor, a current sensor and a storage, wherein the user control panel is used for enabling a user to input the initial air volume Qu; the speed sensor is used for detecting the actual speed n of a motor; the current sensor is used for detecting the actual current i of the motor; the storage is used for storing data such as the speed N, the current I, the static pressure P and air volume Q; the air volume is directly proportional to the speed; the static pressure is directly proportional to the square of the speed; the current is directly proportional to the cube of the speed. Through the judging whether the air volume Q is within the difference value delta Q range or not, the actual speed N is adjusted to change the air volume Q to achieve the purpose that the range hood can output constant air volume.

The invention discloses a constant-air volume control method and device for an indoor unit of an air conditioner and the indoor unit of the air conditioner. The constant-air volume control method includes that acquiring the real-time power of a motor of the indoor unit of the air conditioner under a certain rotating speed; in consideration of the influence of the current input voltage of the air conditioner on the motor power, correcting the real-time power of the motor to obtain a new power value; calculating the power difference between the corrected power value of the motor and a preset standard power value under the motor rotating speed corresponding to the corrected power value of the motor; calculating a target rotating speed of the motor needed for arriving at a preset constant air volume according to the power difference, and controlling the motor to run in the target rotating speed. The constant-air volume control method and device for the indoor unit of the air conditioner and the indoor unit of the air conditioner can precisely detect the air resistance and realize the constant air volume control for the indoor unit of the air conditioner, and meanwhile, the influence of the voltage factor of a power grid of the user is avoided, and the stable refrigerating or heating effect of the air conditioner is guaranteed.

The invention discloses a constant-air-volume control method for a range hood. According to the method, the number of all internally-arranged gears of an indoor unit is x, and the default initial gearof a high gear air volume interval [ Q1, Q2 ] is x / 2; when the operating gear of an indoor range hood is equal to x and the air volume is smaller than Q1, target air volume is reduced from [ Q1, Q2 ]to [ q1, q2 ], so that the gear is reduced, and noise is reduced; and when the target air volume is in the interval [ q1, q2 ], the number of the operating gear is smaller than x-2, the target air volume is changed from [ q1, q2 ] to [ Q1 and Q2 ], so that the air volume is increased, and the oil fume suction effect is improved. The method has the advantages that a constant-air-volume control method of the range hood is applied to a central flue system; from the point of reducing noise, when the start-up rate is extremely high, the air volume interval is properly reduced, a bit of the oil fume suction effect is sacrificed, so that the noise is reduced; the air exhaust amount of high floors is reduced, so that the flue exhaust power of low floors is increased, and the air exhaust volume ofthe low floors is increased; and meanwhile, the air volume of all the floors is ensured to be balanced and capable of meeting the flue exhaust requirement, so that the use experience of users is good.

The invention provides an automatic static pressure regulation control method and system for an air duct type indoor unit. The method includes the following steps that after being powered on, a direct-current motor of the indoor unit is controlled to run at the rotating speed corresponding to preset static pressure, a running current value is detected after the direct-current motor runs for a first period of time, whether the detected running current value is within a target current range corresponding to the preset static pressure is judged through comparison, and stable regulation control over static pressure is conducted according to judgment and comparison results. The rotating speed of the direct-current motor is automatically regulated by comparing the detected running current value with the target current range, so that the air duct type indoor unit keeps output of a constant air volume in the installing and using process all the time, and the requirement of users for use comfort is met.

The invention discloses a direct current fan control method and system. The method comprises the steps of obtaining the target air volume; obtaining the lower-limit air volume and the upper-limit air volume of a range within which the target air volume is located so that a proportionality coefficient can be obtained; collecting the current rotating speed and a torque current of a driving motor; according to the current rotating speed and the torque current, obtaining a low air volume torque current and a high air volume torque current through the lower-limit air volume and the upper-limit air volume; and according to the proportionality coefficient, the low air volume torque current and the high air volume torque current, obtaining a target torque current so that a direct current fan can be controlled to operate according to the target torque current. By means of the control method, the target torque current can be determined according to the target air volume, the current rotating speed and the torque current, and thus the direct current fan is controlled according to the target torque current; the purpose of constant air volume output is achieved; control precision is improved; and the direct current fan control method is simple and easy to implement.

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 provides a low noise fast response permanent magnet direct current brushless motor for controlling constant air volume, which comprises a shell, a stator and a rotor in the shell, wherein the stator comprises a stator iron core and a stator winding which are fixed on the inner wall of the shell, the rotor comprises a main shaft and a rotor iron core, the external circumferential direction of the rotor iron core is evenly fixed with rotor magnetic poles which comprise radial magnetized magnetic steel and tangential magnetized magnetic steel, the radial magnetized magnetic steel is a main magnetic pole, and the tangential magnetized magnetic steel which is arranged between adjacent main magnetic poles is a side magnetic pole. Or, the inner circumferential direction of the rotor iron core is evenly embedded with built-in radial magnetized rectangular strip magnetic steel which is the main magnetic pole, and the tangential magnetized magnetic steel which is arranged between adjacent main magnetic poles is the side magnetic pole. The low noise fast response permanent magnet direct current brushless motor gathers magnetic through two ways of radial and tangential direction, thereby observably increasing the air gap flux density, greatly reducing the mechanical time constant, increasing fast response, controlling the constant air volume in a high performance, which leads a motor to steadily operate in high efficiency, saving energy, low fluctuation, low noise, frequent starting and rapid response, and the low noise fast response permanent magnet direct current brushless motor can achieve the miniaturization and lightening of the motor.

The invention provides a parallel type draught fan power type variable air volume tail end device and a control method thereof. The parallel type draught fan power type variable air volume tail end device comprises a draught fan, a primary air valve connected with the draught fan in parallel, and a direct digital controller. The draught fan comprises a motor, and the draught fan further comprises a check valve with a baffle. The baffle is fixed to the position of a draught fan air outlet of the draught fan through a rotating shaft. When the draught fan is static, the baffle is kept vertical so that primary air can be prevented from entering the draught fan through the check valve; and when the draught fan works, at least part of the baffle is opened. According to the parallel type draught fan power type variable air volume tail end device, when the draught fan is static, the primary air can be prevented from entering the draught fan through the check valve, and when the draught fan works, the baffle can be opened. Through the test, the resistance losses of the baffle can almost be ignored when the draught fan runs, abnormal noise is not generated at the position of the baffle, and constant-air-volume running of the parallel type draught fan power type variable air volume tail end device can be achieved.

The invention discloses an air conditioner and a constant-air-volume control method, a control device and a control system of an indoor fan thereof. The constant-air-volume control method of the indoor fan of the air conditioner comprises the steps of: obtaining an air pressure characteristic curve and an initial air volume Q1 of the indoor fan under a D air gear; acquiring present operation parameters of the indoor fan under the D air gear; solving a present air volume Qn under the D air gear according to the present operation parameters and the air pressure characteristic curve; calculating change values of the initial air volume Q1 under the D air gear and the present air volume Qn; adopting an optimizing algorithm to determine a constant-air air gear matched with the initial air volume Q1 when the change values reach preset thresholds; and actuating an air gear adjusting instruction to adjust the indoor fan to the constant-air air gear. The air conditioner and the constant-air-volume control method, control device and control system of the indoor fan thereof can realize real-time air volume and the initial air volume of the indoor fan to approximate to or even achieve the effect of constant air volume as far as possible, have no need to adopt a constant-air-volume motor, are low in cost, and guarantee the use comfort of the air conditioner.