Fan unit, fan unit system, and air treatment system
A control load is reduced in a fan unit capable of controlling air flow volume. The rotation speed of a fan can be changed. An air flow volume detector detects air flow volume of the fan or equivalent air flow volume that is a physical quantity corresponding to the air flow volume of the fan. A unit casing houses, therein, the fan and the air flow volume detector. A fan controller, which is a controller, controls the rotation speed of the fan. The fan controller controls the rotation speed of the fan on the basis of a command value of the air flow volume of the fan given from outside the unit and a detected value of the air flow volume or the equivalent air flow volume detected by the air flow volume detector.
1. An air treatment system for applying predetermined treatment to air to be supplied to an air conditioned space, the air treatment system comprising:
a plurality of fan units that are capable of changing air flow volume of air to be supplied to the air conditioned space;
an air treatment unit that is connected to the plurality of fan units by a corresponding plurality of ducts, and includes a blower that sends treated air that has been subjected to predetermined treatment through the plurality of ducts to the corresponding plurality of fan units; and
a main controller, wherein
the air treatment unit includes
a use side air flow volume detection sensor that is connected to the main controller and detects air flow volume of the air sent by the blower through the plurality of ducts; and
a use side air temperature sensor that is connected to the main controller and detects a temperature of the air sent from the blower to the plurality of ducts,
each of the plurality of fan units includes
a fan with variable rotation speed;
an air flow volume detector that detects air flow volume of the fan or equivalent air flow volume that is a physical quantity corresponding to the air flow volume of the fan;
a unit casing that fully encloses the fan and the air flow volume detector, and has an intake port connected to one of the plurality of ducts, the air flow volume detector detecting the air flow passing through the unit casing via the intake port; and
a controller that controls a rotation speed of the fan, wherein
the main controller sends a command value of air flow volume to the controller of each of the plurality of fan units,
the controller of each of the plurality of fan units controls the rotation speed of the fan on a basis of a command value of the flow volume of the fan given from the main controller and a detected value of the air flow volume or the equivalent air flow volume detected by the air flow volume detector,
the controller of each of the plurality of fan units controls the rotation speed of the fan so that the air flow volume indicated in the detected value approaches the command value,
the controller of each of the plurality of fan units reduces the rotation speed of the fan in a first operation in which the air flow volume indicated in the detected value is greater than the command value, and
the controller of each of the plurality of fan units increases the rotation speed of the fan in a second operation in which the air flow volume indicated in the detected value is smaller than the command value.
2. The air treatment system according to claim 1 , wherein
in each of the plurality of fan units,
the fan is a centrifugal fan,
the centrifugal fan includes a fan casing, and
the fan casing is housed in the unit casing.
3. The air treatment system according to claim 1 , wherein
in each of the plurality of fan units,
the air flow volume detector includes at least one of a wind speed sensor for detecting a wind speed at a predetermined location in the unit casing, a pressure sensor for detecting a static pressure in the unit casing, a differential pressure sensor for detecting a differential pressure at a predetermined location in the unit casing, and an air flow volume sensor for detecting air flow volume of the fan.
4. The air treatment system according to claim 2 , wherein
in each of the plurality of fan units,
the air flow volume detector includes at least one of a wind speed sensor for detecting a wind speed at a predetermined location in the unit casing, a pressure sensor for detecting a static pressure in the unit casing, a differential pressure sensor for detecting a differential pressure at a predetermined location in the unit casing, and an air flow volume sensor for detecting air flow volume of the fan.
5. The air treatment system according to claim 1 , further comprising
a duct including a main pipe connected to the air treatment unit and a branch pipe that branches off from the main pipe, wherein
each of the plurality of fan units is connected to each of the plurality of branch pipes.
6. The air treatment system according to claim 5 , further comprising:
a plurality of indoor temperature sensors that detects a temperature of the air conditioned space; and
a plurality of remote controllers that inputs a set temperature of the air conditioned space, wherein
each of the plurality of fan units is associated with each of the plurality of indoor temperature sensors and each of the plurality of remote controllers, and
the main controller determines, on a basis of the set temperature of the plurality of remote controllers, the command value of the plurality of fan units according to an indoor temperature detected by the plurality of indoor temperature sensors.
7. The air treatment system according to claim 1 , further comprising:
a plurality of indoor temperature sensors that detects a temperature of the air conditioned space; and
a plurality of remote controllers that inputs a set temperature of the air conditioned space, wherein
each of the plurality of fan units is associated with each of the plurality of indoor temperature sensors and each of the plurality of remote controllers, and
the main controller determines, on a basis of the set temperature of the plurality of remote controllers, the command value of the plurality of fan units according to an indoor temperature detected by the plurality of indoor temperature sensors.
8. The air treatment system according to claim 2 , further comprising
a duct including a main pipe connected to the air treatment unit and a branch pipe that branches off from the main pipe, wherein
each of the plurality of fan units is connected to each of the plurality of branch pipes.
9. The air treatment system according to claim 3 , further comprising
a duct including a main pipe connected to the air treatment unit and a branch pipe that branches off from the main pipe, wherein
each of the plurality of fan units is connected to each of the plurality of branch pipes.