JPH10141747A - Duct type air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically suitably regulate an air volume by obtaining necessary operating power of a fan motor based on a detected result of the power of the motor, selecting the power as an actual control value of the motor, and operating the motor at the time of air conditioning in response to the selected control value. SOLUTION: Heat exchangers 11, 12 are provided at positions corresponding to air outlets 2, 3. Fans 13, 14 are provided at inside the exchangers 11, 12. The fan 13 is driven by a fan motor 1m corresponding to the exchanger 11 and air outlets 4, 5, and the fan 14 is driven by a fan motor 1m corresponding to the exchanger 12 and air outlets 6, 7. Necessary operating powers of the motors 1m, 1m to set the diffused air volumes of diffusing damper units 41 to 44 to rated air volume are obtained by a controller 15 based on the operating powers of the motors 1m, 1m at that time. Actual control values of the motors 1m, 1m are selected and operated by the obtained powers.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a duct-type air conditioner which draws air through a heat exchanger by operating a fan, guides the sucked air to a blowing unit by a duct, and blows the air into a room to be air-conditioned.

[0002]

2. Description of the Related Art There is a duct type air conditioner in which air is sucked through a heat exchanger by operation of a fan, the sucked air is guided to a blowing unit by a duct, and is blown from the blowing unit to a room to be air-conditioned.

[0003] The length and the degree of bending of the duct of the duct type air conditioner vary depending on the installation condition in the building. After installation, dust accumulates in the duct. Such a change in the length and the degree of bending, dust accumulation, and the like appear as a difference in ventilation resistance, and the difference in the ventilation resistance appears as a large “variation” in the amount of air blown to the room to be air-conditioned.

In order to eliminate such a large “variation” in the air flow, it is necessary to calculate the ventilation resistance of the duct by calculation and adjust the rotation speed of the fan according to the determined ventilation resistance. A static pressure changeover switch is provided for this adjustment, and any one of a strong wind speed, a weak wind speed, and a light wind speed can be set.

[0005]

The task of calculating the ventilation resistance of the duct by calculation and adjusting the number of rotations of the fan is very time-consuming and burdens the operator. It is possible to automatically adjust the number of rotations of the fan by detecting the pressure and wind speed in the duct with a sensor, but in that case the sensor becomes large and the same number of sensors as the number of ducts are prepared Must be done, resulting in a considerable increase in costs. There is also a problem that it takes time to attach the sensor and connect the wiring.

[0006] The present invention has been made in view of the above circumstances,
The aim is to provide a duct-type air conditioner that automatically adjusts the appropriate air volume in consideration of the ventilation resistance of the duct and obtains an appropriate air volume without the need for laborious work or large sensors. To provide.

[0007]

According to a first aspect of the present invention, a duct type air conditioner sucks air through a heat exchanger by operating a fan, guides the sucked air to a blowout unit by a duct, and blows the air into a room to be air-conditioned. Detecting means for detecting the operating power of the motor of the fan, and operating the motor at a constant rotation speed, and based on the detection result of the detecting means at that time, the blow-off air volume of the blow-off unit and the rated air flow. And a control means for operating the motor according to the control value selected by the selection means during air-conditioning. , Is provided.

In a duct type air conditioner according to a second aspect of the present invention, air is sucked through a heat exchanger by operating a fan, and the sucked air is guided to a plurality of blowing units by a plurality of ducts and blown out to a room to be air-conditioned. A blower for adjusting the air flow rate in each blowout unit, a detecting means for detecting the operating power of a fan motor, a motor operating at a constant rotation speed, and a damper for each blowout unit. When the damper is fully open, the operating power of the motor required to bring the blow air volume of each blowout unit to the rated air flow when the damper is fully open is set based on the detection result of the detection means when the damper is fully open. Selection means for selecting the largest operation power among these operation powers as the actual control value of the motor, and a system for operating the motor with the control value selected by the selection means during air conditioning. And means, the.

A third aspect of the present invention provides a duct type air conditioner,
In the invention, the detection means for detecting the operating power of the fan motor, the motor is started with a control value selected by the selection means, and the dampers of each blowout unit are fully opened one by one and the others are fully closed. Determining means for adjusting the opening of the fully opened damper so that the detection result of the detecting means falls within the control value, and determining the opening obtained by this adjustment as the maximum allowable opening of the damper; and Control means for controlling the damper opening of each blow-off unit up to the determined maximum allowable opening.

A fourth aspect of the present invention is a duct type air conditioner in which air is sucked through a heat exchanger by operation of a fan, the sucked air is guided to a blowing unit by a duct, and is blown into a room to be air-conditioned. Detecting means for detecting the operating power of the fan motor, and operating the motor at a constant rotation speed,
Based on the detection result of the detection unit at that time, a selection unit that determines the number of rotations of the motor required for setting the blown air volume of the blowout unit to the rated air volume and selects the rotation speed as an actual control value of the motor; And control means for operating the motor in accordance with the control value selected by the selection means.

In the duct type air conditioner according to the fifth aspect of the present invention, the air is sucked through the heat exchanger by the operation of the fan, and the sucked air is guided to a plurality of blowing units by a plurality of ducts and is blown out to the room to be air-conditioned. A damper for adjusting the air volume in each of the blowout units, a detecting means for detecting the operating power of the fan motor, the motor being operated at a constant rotation speed, and one damper for each of the blowout units. Based on the detection result of the detection means when the damper is fully open, the number of motor rotations required to reach the rated air flow when the damper is fully open is determined based on the detection result of the detection means when the damper is fully opened. Selection means for selecting the largest rotation speed among these rotation speeds as the actual control value of the motor, and control means for operating the motor with the control value selected by the selection means during air conditioning. Equipped with a.

According to a sixth aspect of the present invention, there is provided a duct type air conditioner comprising:
In the invention, the detection means for detecting the operating power of the fan motor, the motor is started with a control value selected by the selection means, and the dampers of each blowout unit are fully opened one by one and the others are fully closed. Determining means for adjusting the opening of the fully opened damper so that the detection result of the detecting means falls within the control value, and determining the opening obtained by this adjustment as the maximum allowable opening of the damper; and Control means for controlling the damper opening of each blow-off unit up to the determined maximum allowable opening.

According to a seventh aspect of the present invention, there is provided a duct type air conditioner comprising:
In any one of the sixth to sixth inventions, a plurality of fans are provided, and a plurality of ducts and a plurality of blowing units are provided for each of the fans.

According to an eighth aspect of the present invention, there is provided a duct type air conditioner comprising:
In any one of the sixth to sixth inventions, the fan motor is a DC motor whose operating power changes in accordance with the duty ratio of the applied voltage or the level control of the applied voltage, and the detecting means converts the operating power to the fan motor. From the duty ratio or the applied voltage level.

According to a ninth aspect of the present invention, there is provided a duct type air conditioner comprising:
In any one of the sixth to sixth inventions, the motor of the fan is an AC motor whose operating power changes according to the duty ratio based on the phase control, and the detecting means detects the operating power from the duty ratio of the fan motor.

A duct type air conditioner according to a tenth aspect of the present invention is the air conditioner according to any one of the first to sixth aspects, further comprising control means for executing processing of the selection means or the determination means at the start of air conditioning.

An air conditioner according to an eleventh aspect of the present invention is the air conditioner of any one of the first to sixth aspects, further comprising a control means for executing the processing of the selection means or the determination means when the power is turned on. The duct type air conditioner of the twelfth invention is the first type.
In any one of the sixth to sixth aspects, an operating means for executing the processing of the selecting means or the determining means is provided.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION

[1] First Embodiment Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 denotes an indoor unit, which has suction ports 2 and 3 at opposing positions on the outer periphery of a housing, and has two outlets 4, 5, 6, and 7 at different positions. Have. The outlets 4, 5, 6, and 7 also serve as duct connection portions.

The heat exchanger 1 is located at a position corresponding to the suction ports 2 and 3.
1 and 12 are provided, and fans 13 and 14 are provided inside the heat exchangers 11 and 12. The fan 13 corresponds to the heat exchanger 11 and the outlets 4 and 5, and the fan motor 13M
Driven by By this drive, the air in the place where the indoor unit 1 is installed is passed through the heat exchanger 11 to the indoor unit 1.
And the suction air is blown out from the outlets 4 and 5.

The fan 14 corresponds to the heat exchanger 12 and the outlets 6 and 7, and is driven by a fan motor 14M. By this driving, the air in the place where the indoor unit 1 is installed is sucked into the indoor unit 1 through the heat exchanger 12, and the sucked air is blown out from the outlets 6 and 7.

The fan motors 13M and 14M may be either DC motors (so-called DC motors) or AC motors (so-called AC motors). If it is a DC motor,
The operating power changes according to the duty ratio based on the duty control of the applied voltage or the level control of the applied voltage. In the case of an AC motor, the operating power changes according to the duty ratio based on the phase control.

The indoor unit 1 is provided with a controller 15. The controller 15 controls the entire air conditioner, and is connected to a commercial AC power supply 16. In the controller 15,
An outdoor unit 20 is connected via a power supply line 17 and a serial signal line 18. Further, a refrigerant pipe 21 is connected between the outdoor unit 20 and the heat exchangers 11 and 12 of the indoor unit 1. 22 is a drain pump.

Ducts 31, 32, 33, 34 of a predetermined length are connected to the outlets 4, 5, 6, 7, respectively, and blow units 41, 42, 43, 44 are connected to the ends of the ducts. The blowout units 41, 42, 43, and 44 have dampers 51, 52, 53, and 54 for adjusting the amount of blown air. The blowing unit is hereinafter referred to as a blowing damper unit.

The controller 15 has the following main functions (1) to (5). (1) Detection means for detecting the operating power of the fan motors 13M and 14M, respectively. If the fan motors 13M and 14M are DC motors, the detection is performed based on the duty ratio or the applied voltage level of the fan motor. Fan motor 13M, 14
If M is an AC motor, it is detected from the duty ratio of the fan motor.

(2) Detecting when the fan motor 13M is operated at a predetermined constant rotation speed, the dampers of the blow-out damper units 41, 42 are fully opened one by one, and the other dampers are fully closed, and the dampers are fully opened. Based on the detection result of the means and the predetermined air volume characteristics, the operating power of the fan motor 13M required to make the blowing air volume of the blowing damper units 41 and 42 the rated air volume when the damper is fully opened is obtained. Out of the fan motor 13
M is selected as the actual control value, the fan motor 14M is operated at a predetermined constant rotation speed, the dampers of the blow-out damper units 43 and 44 are fully opened one by one, and the other dampers are fully closed. Based on the detection result of the detection means when fully opened and a predetermined air volume characteristic, the operating electric power of the fan motor 14M required to make the blow air volume of the blow-out damper units 43 and 44 the rated air volume when the damper is fully opened, respectively. Selecting means for determining the largest operating power among the operating powers as the actual control value of the fan motor 14M.

(3) The fan motor 13M is started with the selected control value, and the blow-out damper units 41, 42
The damper is fully opened one by one and the other is fully closed. The opening of the fully opened damper is adjusted so that the operating power of the fan motor 13M falls within the control value, and the opening obtained by this adjustment is adjusted to the allowable value of the damper. The maximum opening is determined, the fan motor 14M is started with the selected control value, the dampers of the blow-out damper units 43 and 44 are fully opened one by one, and the other dampers are fully closed. Determining means for adjusting the degree so that the operating power of the fan motor 14M falls within the control value, and determining the opening obtained by this adjustment as the allowable maximum opening of the damper.

(4) Control means for executing the processing of the selection means and the determination means at the start of air conditioning. (5) At the time of air conditioning, the fan motors 13M, 14M are operated with the selected control values, and the blowout damper units 41, 42,
Control means for controlling the damper openings 43 and 44;

FIG. 4 shows the air volume characteristics used for selecting the control value by the selection means. This air volume characteristic shows an example where, when there are two ducts and two blowout damper units, the damper of one blowout damper unit is fully opened and the damper of the other blowout damper unit is fully closed. The standard value of the duty ratio of the fan motor is the ventilation resistance from the duct to the blow-out damper unit, the so-called outside resistance is standard, and the rotation speed when the rated air volume is obtained from the blow-out damper unit when all the dampers are fully opened, for example, 1300 rpm
Corresponding to When the fan motor is operated at a constant rotation speed, the duty ratio of the fan motor when one damper is fully opened and the other damper is fully closed is set as a standard value.

Next, the operation of the above configuration will be described. When air conditioning is started, first, the processing shown in the flowcharts of FIGS. 2 and 3 is executed.

As initial settings, fan number No = 1, fan number set value Nmax = 2, blowout damper unit number NoDo =
1. The blow damper unit number setting value NoDmax = 2 is set (steps 101 and 102).

The fan numbers No. are "1" and "2", and correspond to the fans 13 and 14, respectively. The blowout damper unit number NoDo ranges from "1" to "4", and corresponds to the blowout damper units 41, 42, 43, and 44, respectively.

(A) The duty ratio of the fan 13 system and the maximum allowable damper opening First, based on the fan number No = 1, the fan motor 13M
Is operated at a predetermined rotation speed, for example, constant at 1300 rpm (step 103). In this case, the rotation speed of the fan motor 13M is detected by a Hall element or the like, and the detected rotation speed is 1300 rp.
m, the duty ratio of the fan motor 13M is increased or decreased.

Further, the blowout damper unit number NoDo = 1
, The damper 51 of the blow-out damper unit 41 is fully opened, and the dampers of the other blow-out damper units are fully closed (step 104).

At this time, the duty ratio of the fan motor 13M is known, and the duty ratio is within the allowable range (± 5%) centered on the standard value, based on the comparison with the predetermined air volume characteristic of FIG. Is determined (step 105).

If the _duty ratio is within the allowable range centered on the standard value (step 105, Yes), the _duty ratio at that time is the reference _duty ratio T _{NODO with} respect to the ventilation resistance from the duct 31 to the blow-out damper unit 41. Is temporarily stored as (step 106).

If the ventilation resistance from the duct 31 to the blow-out damper unit 41 is large, the fan motor 13M
And load is reduced, the duty factor is as shifts to A ₁ point of the lower side than the standard value.

The duty factor of the A ₁ point is deviated below the allowable range around the standard value (NO in step 105),
Thus is multiplied by the numerical example, "1.2" which is predetermined with respect to duty ratio of A ₁ point, A ₁ to bring the airflow volume when the damper fully open the outlet damper unit 41 to the rated air volume '
The duty ratio of the point is determined. The _duty ratio at the point A ₁ ′ is temporarily stored as a reference _duty ratio T _NODO for the ventilation resistance from the duct 31 to the blow-out damper unit 41 (step 107).

If the external resistance from the duct 31 to the blow-out damper unit 41 is small, the fan motor 13M
Load is increased, the energization rate is shifted to C ₁ point higher side than the standard value.

The duty factor of C ₁ point is deviated above the allowable range around the standard value (NO in step 105),
Accordingly, a predetermined numerical value, for example, “0.8” is multiplied by the duty ratio of the point C ₁ , and C ₁ ′ is used to bring the blow-off air volume when the damper unit 41 is fully opened to the rated air flow.
The duty ratio of the point is determined. The _duty ratio at the point C ₁ ′ is temporarily stored as the reference _duty ratio T _NODO for the ventilation resistance from the duct 31 to the blow-out damper unit 41 (step 107).

Next, the blowing damper unit number NoDo is increased by "1" to "2" (step 108). When the blowout damper unit number NoDo = 2, the condition of NoDo ≦ NoDmax is satisfied (Yes in step 109).
The processing from step 104 to step 106 or the processing from step 104 to step 107 are repeated, and the reference duty ratio T for the ventilation resistance from the duct 32 to the blow-out damper unit 42 based on the operation of the fan 13
_NODO is requested and it is temporarily stored. Then, the blowout damper unit number NoDo is increased by "1" to "3" (step 108).

When the blow damper unit number NoDo becomes "3", the condition of NoDo≤NoDmax is not satisfied (No in step 109). Therefore, the temporarily stored ventilation resistance from the duct 31 to the blow damper unit 41 is not satisfied. a reference duty ratio T _nodo respect, a reference duty ratio T _nodo for ventilation resistance from the duct 32 toward the outlet damper unit 42, are compared with one another. The larger of the two reference _duty ratios T _NODO is selected (stored) as the actual control value (= _duty ratio) of the fan motor 13M (step 111).

Subsequently, the current blower damper unit number
"2" is subtracted from NoDo = 3, and the blowout damper unit number NoDo = 1 is set (step 112). Then, the fan motor 13M is first started with the selected control value (= reference duty ratio) (step 113).

Set blowout damper unit number NoDo =
1, the dampers 51 of the blow-out damper unit 41 are fully opened, and the dampers of the other blow-out damper units are fully closed (step 114).

The opening degree of the fully opened damper 51 is appropriately adjusted by several percent so that the operating power of the fan motor 13M falls within an allowable range (± 5%) around the control value, and the opening obtained by this adjustment is adjusted. Is determined (stored) as the maximum allowable opening of the damper 51 (steps 115, 116, 11).
7).

When the allowable maximum opening of the damper 51 in the blow-out damper unit 41 is determined in this way, the blow-out damper unit number NoDo is increased by "1" to "2" (step 118).

When the blowout damper unit number NoDo = 2,
Since the condition of NoDo ≦ NoDmax is satisfied (Yes in step 119), the process returns to step 114, and the dampers 52 of the blow-out damper unit 42 are fully opened, and the dampers of the other blow-out damper units are fully closed. And the fan motor 13M
The opening of the fully opened damper 52 is appropriately adjusted by several percent so that the operating power of the damper 52 falls within the allowable range (± 5%) centered on the control value. The maximum opening is determined (stored) (steps 115, 116, 117).

When the allowable maximum opening of the damper 52 in the blow-out damper unit 42 is determined in this way, the blow-out damper unit number NoDo is increased by "1" to "3" (step 118).

When the blowout damper unit number NoDo becomes "3", the condition of NoDo≤NoDmax is not satisfied (No in step 119), and the operation of the fan motor 13M is stopped (step 120).

(B) The duty ratio of the fan 14 and the damper 5
Allowable maximum opening of 3,54 After operation of fan motor 13M is stopped, fan number
No is increased by “1” to “2” (step 121)
).

If the fan number is No. = 2, since the condition of No.ltoreq.Nmax is satisfied (Yes in step 122), the blowout damper unit number set value NoDmax = 4 is set (step 123). Thereafter, the flow returns to step 103, and the fan motor 14M is operated at a constant 1300 rpm.

Since the outlet damper unit number NoDo is "3", the dampers 53 of the outlet damper unit 43 are fully opened and the dampers of the other outlet damper units are fully closed (step 104).

At this time, the duty ratio of the fan motor 14M is known, and the duty ratio is within the allowable range (± 5%) centered on the standard value by comparing it with the predetermined air volume characteristic of FIG. Is determined (step 105).

If the duty ratio is within the allowable range centered on the standard value (Yes in step 105), the duty ratio at that time is equal to the reference duty ratio T to the ventilation resistance from the duct 33 to the blow-out damper unit 43. _It is temporarily stored as _NODO (step 106).

If the duty ratio is outside the allowable range centered on the standard value (No in step 105), the duty ratio is multiplied by a numerical value "1.2", and when the damper of the blow-out damper unit 43 is fully opened. Is required to make the amount of air blown out of the air supply reach the rated air flow. This duty ratio is
_Is temporarily stored as a reference _duty ratio T _{NODO with} respect to the ventilation resistance from the outlet to the blowout damper unit 43 (step 10).
7).

If the duty ratio is out of the allowable range centered on the standard value (No in step 105), the duty ratio is multiplied by a numerical value "0.8", and when the damper of the blow-out damper unit 43 is fully opened. An energization rate for causing the blown air volume to reach the rated air volume is required. This duty ratio is
_Is temporarily stored as a reference _duty ratio T _{NODO with} respect to the ventilation resistance from the outlet to the blowout damper unit 43 (step 10).
7).

Next, the blowout damper unit number NoDo is increased by "1" to "4" (step 108). When the blowout damper unit number NoDo = 4, the condition of NoDo ≦ NoDmax is satisfied (Yes in step 109).
The processing of steps 104 to 106 or the processing of steps 104 to 107 described above is repeated, and based on the operation of the fan 14, the reference duty ratio T with respect to the ventilation resistance from the duct 34 to the blow-out damper unit 44
_NODO is requested and it is temporarily stored. Then, the blowout damper unit number NoDo is increased by "1" to "5" (step 108).

When the blowout damper unit number NoDo = 5,
The condition of NoDo ≦ NoDmax is no longer satisfied (step 109
No.) Therefore, the duct 3 which is temporarily stored in the above
The reference _duty ratio T _NODO with respect to the ventilation resistance from 3 to the blowing damper unit 43 and the reference _duty ratio T with respect to the ventilation resistance from the duct 34 to the blowing damper unit 44.
_NODO is compared with each other. These two reference duty ratios T
_The larger of the _NODOs is selected (stored) as the actual control value (= reference _duty ratio) of the fan motor 14M (step 111).

Subsequently, the current blower damper unit number
"2" is subtracted from NoDo = 5, and blowout damper unit number NoDo = 3 is set (step 112). Then, the fan motor 14M is controlled by the selected control value (= conductivity).
Is started first (step 113).

Set blowout damper unit number NoDo =
Based on 3, the dampers 53 of the blow-out damper unit 43 are fully opened, and the dampers of the other blow-out damper units are fully closed (step 114).

The opening degree of the fully opened damper 53 is appropriately adjusted by several percent so that the operating power of the fan motor 14M falls within an allowable range (± 5%) around the control value, and the opening obtained by this adjustment is adjusted. Is determined (stored) as the allowable maximum opening of the damper 53 (steps 115, 116, 11).
7).

When the allowable maximum opening of the damper 53 in the blow-out damper unit 43 is determined in this way, the blow-out damper unit number NoDo is increased by "1" to "4" (step 118).

When the blowout damper unit number NoDo = 4,
Since the condition of NoDo ≦ NoDmax is satisfied (Yes in step 119), the process returns to step 114, and the dampers 54 of the blow-out damper unit 44 are fully opened, and the dampers of the other blow-out damper units are fully closed. And the fan motor 14M
The opening of the fully opened damper 54 is appropriately adjusted by several percent so that the operating power of the damper 54 falls within the allowable range (± 5%) centered on the control value. The maximum opening is determined (stored) (steps 115, 116, 117).

When the allowable maximum openings of the dampers 53 and 54 are determined, the operation of the fan motor 14M is stopped (step 120), and the fan number No.
Is increased by "1" to "3" (step 121).

When the fan number is No. = 3, the condition of No ≦ Nmax is not satisfied (No in step 122), and the series of processes is completed. (C) In the actual air conditioning, the fan motors 13M and 14M are operated at the selected control value, that is, the reference duty ratio, and the blowout damper units 41, 42, and 4 are respectively operated.
The opening degrees of the dampers 51, 52, 53, 54 are controlled with the maximum allowable opening determined as a limit.

FIGS. 5 and 6 show an example in which the duty ratio is 50% and 40% when the fan motors 13M and 14M are DC motors.
Is shown in FIGS. 7 and 8 show examples of the duty ratio when the fan motors 13M and 14M are AC motors at 50% and 40%.

Therefore, the ducts 31, 3 at the time of installation are
Regardless of the difference in the ventilation resistance due to the length or the degree of bending of each of the blowout dampers 41, 42, 43, and 44, regardless of the difference in ventilation resistance due to the accumulation of dust in each duct. It is possible to uniformly set the blown air volume to an appropriate state close to the rated air volume.

As in the prior art, there is no need to calculate the ventilation resistance of the duct by calculation and adjust the number of revolutions of the fan, thereby reducing the burden on the operator. It is not necessary to detect the pressure and the wind speed in the duct with a large-scale sensor, so that it is possible to avoid an increase in cost, and it is possible to save time for mounting the sensor and connecting wires.

In the above embodiment, the process of selecting the duty ratio and the process of determining the allowable maximum opening are executed at the start of air conditioning. However, the present invention is not limited to this.
The control executed at the time of insertion of 6, or the control executed when a dedicated operation means is operated may be adopted.

[2] Second Embodiment A second embodiment of the present invention will be described. As shown in FIG. 9, two outlets 8, 9 also serving as duct connection portions are provided in the housing of the indoor unit 20. Ducts 35 and 36 are connected to the outlets 8 and 9, and outlet units 45 and 46 are provided at distal ends of the ducts 35 and 36. These blowout units do not have a damper for adjusting the air volume.

The controller 15 has the following (1) to (4) as main functional means. (1) Detection means for detecting the operating power of the fan motors 13M and 14M, respectively. (2) The fan motor required to operate the fan motor 13M at a predetermined constant rotation speed and to set the blowing air volume of the blowing unit 45 to the rated air volume based on the operating power (conductivity) of the fan motor 13M at that time. 13M operating power is obtained and selected as an actual control value of the fan motor 13M, and the fan motor 14M is operated at a predetermined constant rotation speed. Based on the operating power of the fan motor 14M at that time, the blowing unit is operated. The operating power of the fan motor 14M required to make the blowing air volume of 46 a rated air volume is obtained,
Selection means for selecting it as an actual control value of the fan motor 14M.

(3) Control means for executing the processing of the selection means at the start of air conditioning. (4) Control means for operating the fan motors 13M and 14M with the selected control values during air conditioning.

The other structure is the same as that of the first embodiment. The operation will be described. When air conditioning is started, the process shown in the flowchart of FIG. 10 is first executed.

As an initial setting, a fan number No. 1 and a fan number set value Nmax = 2 are set (step 201).
First, based on the fan number No = 1, the fan motor 13M
Is operated at a predetermined rotation speed, for example, constant at 1300 rpm (step 202). At this time, the duty ratio of the fan motor 13M is known, and it is determined whether the duty ratio is within an allowable range (± 5%) centered on the standard value (step 203).

If the duty ratio is within the allowable range centered on the standard value (Yes in step 203), the _duty ratio at that time is determined by the reference _duty ratio T _{NODO with} respect to the ventilation resistance from the duct 35 to the blowout unit 45. Is temporarily stored (step 204).

When the ventilation resistance is large, the fan motor 1
The 3M load decreases, and the duty ratio shifts to a side lower than the standard value. When the duty ratio falls outside the allowable range centered on the standard value (No in step 203), the duty ratio is multiplied by a predetermined numerical value, for example, "1.2", and the blowing air volume of the blowing unit 45 is rated. The duty factor for reaching the air volume is required. This _duty ratio is temporarily stored as a reference _duty ratio T _NODO for the ventilation resistance from the duct 35 to the blowout unit 45 (step 204).

If the ventilation resistance is small, the fan motor 1
The load of 3M increases, and the duty ratio shifts to a higher side than the standard value. If the duty ratio is outside the allowable range centered on the standard value (No in step 203), the duty ratio is multiplied by a predetermined numerical value, for example, "0.8", and the amount of air blown from the blow-out unit 45 is adjusted to the rated air volume. Is required. This _duty ratio is temporarily stored as a reference _duty ratio T _NODO for the ventilation resistance from the duct 35 to the blowout unit 45 (step 204).

Then, the operation of the fan motor 13M is stopped (step 206), and the fan number No is increased by "1" to "2" (step 207). If the fan number is No = 2, the condition of No ≦ Nmax is satisfied (Yes in step 208), and thereafter, the above-described processing from step 202 to step 204 or the processing from step 202 to step
The process of step 205 is repeated, and the reference _duty ratio T _NODO for the ventilation resistance from the duct 36 to the blowout unit 46 based on the operation of the fan 14 is obtained, and is temporarily stored.

Then, the operation of the fan motor 14M is stopped (step 206), and the fan number No is increased by "1" to "3" (step 207). When the fan number No. becomes "3", the condition of No.ltoreq.Nmax is not satisfied (No in step 208), and the series of processing is completed.

In actual air conditioning, fan motors 13M, 1
4M are operated at the selected control value, that is, the reference duty ratio. Therefore, the ducts 35, 3 at the time of installation are
6 regardless of the difference in ventilation resistance due to the length and the degree of bending, and regardless of the change in ventilation resistance due to accumulation of dust in each duct.
6 can be uniformly set to an appropriate state close to the rated air flow.

As in the prior art, there is no need to calculate the ventilation resistance of the duct by calculation and adjust the number of rotations of the fan, so that the burden on the operator is reduced. It is not necessary to detect the pressure and the wind speed in the duct with a large-scale sensor, so that it is possible to avoid an increase in cost and to save time for mounting the sensor and connecting wiring.

In the above-described embodiment, the process for selecting the duty ratio is executed at the start of air conditioning. However, the present invention is not limited to this. The control executed when the commercial AC power supply 16 is turned on, or a dedicated operating means is operated. May be adopted.

In each of the embodiments described above, the actual control value (duty ratio) of the fan motor is selected and the duty ratio of the fan motor is controlled to be equal to this control value during operation. It is also possible to replace the control value with the number of revolutions.

That is, the actual operating power (conduction rate) is compared with a standard value, and the reference power (reference conduction rate) is selected based on the comparison result, instead of selecting the fan speed (1300 rpm).
May be corrected to select a control value (the number of revolutions), and control the actual number of revolutions of the fan during operation to be the control value (the number of revolutions). In this case, it is possible to suppress a change in the fan rotation speed due to a power supply voltage change or the like. As another means, the selection of the actual control value (duty ratio) of the fan motor is left as it is, and after the selection, the fan rotation speed when the fan is operated at the duty ratio is detected and the actual operation value is determined. May be a method of using this rotation speed as a control value. Others
The present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the invention.

[0084]

As described above, according to the present invention, the fan motor is operated at a constant rotation speed, and the blowing air volume of the blowing unit is set to the rated air volume based on the operating power of the motor at that time. The required operating power of the motor is determined, and the operating power is selected as the actual control value of the motor.At the time of air conditioning, the motor is operated with the selected control value. It is possible to provide a duct-type air conditioner that can automatically perform appropriate air volume adjustment taking into account the ventilation resistance of a duct without requiring a sensor and without requiring fine current detection, and can obtain an appropriate blow air volume.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a first embodiment.

FIG. 2 is a flowchart for explaining the operation of the first embodiment.

FIG. 3 is a flowchart following FIG. 2;

FIG. 4 is a diagram showing air volume characteristics of a fan in each embodiment.

FIG. 5 is a diagram showing an example of the duty ratio when the fan motor of the first embodiment is a DC motor.

FIG. 6 is a diagram showing another example of the duty ratio when the fan motor of the first embodiment is a DC motor.

FIG. 7 is a diagram showing an example of the duty ratio when the fan motor of the first embodiment is an AC motor.

FIG. 8 is a diagram showing another example of the duty ratio when the fan motor of the first embodiment is an AC motor.

FIG. 9 is an overall configuration diagram of a second embodiment.

FIG. 10 is a flowchart for explaining the operation of the second embodiment.

[Explanation of symbols]

1 ... indoor unit, 2, 3 ... suction port, 4, 5, 6, 7, 8, 9
... Air outlets, 11, 12 ... Heat exchangers, 13,14 ... Fans, 13M, 14M ... Fan motors, 15 ... Controllers, 2
0 ... outdoor unit, 31, 32, 33, 34, 35, 36 ... duct, 41, 42, 43, 44 ... blowout damper unit,
45, 46 ... blowing unit, 51, 52, 53, 54 ...
damper

Claims (12)

[Claims] 1. A duct-type air conditioner in which air is sucked through a heat exchanger by operation of a fan, the sucked air is guided to a blowing unit by a duct, and is blown into a room to be air-conditioned. Detecting means for detecting, operating the motor at a constant rotation speed, and, based on the detection result of the detecting means at that time, determine the operating power of the motor required to make the blowing air volume of the blowing unit a rated air volume. Selection means for selecting the operation power as an actual control value of the motor; and control means for operating the motor in accordance with the control value selected by the selection means during air conditioning. Duct type air conditioner. 2. The operation of the fan sucks air through a heat exchanger, guides the sucked air to a plurality of blowing units by a plurality of ducts, and blows the air to a room to be air-conditioned.
In a duct-type air conditioner provided with a damper for adjusting the air flow rate in each blowout unit, a detecting means for detecting an operation power of a motor of the fan; a motor operating at a constant rotation speed; The dampers are fully opened one by one and the others are fully closed, and based on the detection result of the detection means when the dampers are fully opened, the motors necessary for adjusting the blow air volume of each blow unit to the rated air volume when the dampers are fully opened are provided. Selecting means for determining the operating power respectively and selecting the largest operating power among these operating powers as the actual control value of the motor; and controlling means for operating the motor with the control value selected by the selecting means during air conditioning. A duct-type air conditioner, comprising: 3. The duct-type air conditioner according to claim 2, wherein: a detecting means for detecting an operating power of a motor of the fan; and the motor is started with a control value selected by the selecting means, and The dampers of each blowout unit are fully opened one by one and the others are fully closed, and the opening of the fully opened damper is adjusted so that the detection result of the detection means falls within the control value, and the opening obtained by this adjustment is the same. Determining means for determining the allowable maximum opening of the damper; and control means for controlling the damper opening of each of the blow-off units up to the allowable maximum opening determined by the determining means during air conditioning. A duct type air conditioner characterized by the following. 4. A duct-type air conditioner in which air is sucked through a heat exchanger by operation of a fan, and the sucked air is guided to a blowing unit by a duct and blown out to a room to be air-conditioned. Detecting means for detecting, and operating the motor at a constant rotation speed, based on the detection result of the detecting means at that time, determine the rotation speed of the motor required to make the blowing air volume of the blowing unit a rated air volume. ,
Selecting means for selecting the number of revolutions as an actual control value of the motor; and control means for operating the motor in accordance with the control value selected by the selecting means during air conditioning. Type air conditioner. 5. The operation of the fan sucks air through the heat exchanger, guides the sucked air to a plurality of blow-off units by a plurality of ducts, and blows the air to a room to be air-conditioned.
In a duct-type air conditioner provided with a damper for adjusting the air flow rate in each blowout unit, a detecting means for detecting an operation power of a motor of the fan; a motor operating at a constant rotation speed; The dampers are fully opened one by one and the others are fully closed, and based on the detection result of the detection means when the dampers are fully opened, the motors necessary for adjusting the blow air volume of each blow unit to the rated air volume when the dampers are fully opened are provided. Find the number of rotations respectively,
Selection means for selecting the largest rotation speed among these rotation speeds as the actual control value of the motor; and control means for operating the motor with the control value selected by the selection means during air conditioning. Features a duct type air conditioner. 6. The duct type air conditioner according to claim 5, wherein a detecting means for detecting an operating power of a motor of the fan; and the motor is started with a control value selected by the selecting means; The dampers of each blowout unit are fully opened one by one and the others are fully closed, and the opening of the fully opened damper is adjusted so that the detection result of the detection means falls within the control value, and the opening obtained by this adjustment is the same. Determining means for determining the allowable maximum opening of the damper; and control means for controlling the damper opening of each of the blow-off units up to the allowable maximum opening determined by the determining means during air conditioning. A duct type air conditioner characterized by the following. 7. The duct-type air conditioner according to claim 1, wherein a plurality of fans are provided, and a plurality of ducts and a plurality of blowing units are provided for each of the fans. Features a duct type air conditioner. 8. The duct-type air conditioner according to claim 1, wherein the motor of the fan operates according to a duty ratio based on a duty control of the applied voltage or a level control of the applied voltage. Wherein the detecting means detects the operating power from a duty ratio of the motor of the fan or an applied voltage level. 9. The duct type air conditioner according to claim 1, wherein the fan motor is an AC motor whose operating power changes according to a duty factor based on phase control. The duct type air conditioner is characterized in that the means detects the operating power from the duty ratio of the motor of the fan. 10. The duct-type air conditioner according to claim 1, further comprising control means for executing processing of the selection means or the determination means at the start of air conditioning. Air conditioner. 11. The duct-type air conditioner according to claim 1, further comprising control means for executing processing of the selection means or the determination means when the power is turned on. Air conditioner. 12. The duct type air conditioner according to claim 1, further comprising an operation unit for executing a process of a selection unit or a determination unit. .