JP2953455B2 - Air conditioner fan control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fan control device for an air conditioner having a plurality of indoor fans installed in an indoor unit.

[0002]

2. Description of the Related Art For example, in Japanese Patent No. 2577374,
An indoor unit of a floor-mounted air conditioner in which a pair of upper and lower indoor fans is provided is disclosed. A configuration example of such an indoor unit will be described with reference to FIG. 3 which is an explanatory diagram of the present invention. In the main body casing 1, an upper outlet 2 is formed above a suction port 4 provided in the center of the front surface (left side surface in the figure), and a lower outlet 3 is formed below the main body casing 1. Are located on the upper side and the lower side behind the heat exchanger 6 located along the suction port 4,
An upper fan 7 and a lower fan 8 each comprising a cross flow fan are provided.

[0003] By driving these fans 7, 8, the room air sucked through the suction port 4 is heated or cooled when passing through the heat exchanger 6, and then is heated from the upper fan 7 and the lower fan 8 to the upper outlet. 2. The air is blown into the room from the upper outlet 2 and the lower outlet 3 through the upper outlet channel 10 and the lower outlet channel 14 respectively reaching the lower outlet 3.

In the illustrated indoor unit, a horizontal flap 11 for deflecting the blowing direction up and down is rotatably provided at an upper outlet port 2 and a lower outlet channel 1 is provided.
4, a shutter member 15 for opening and closing the flow path is provided. The horizontal flap 11 and the shutter member 15 are held at the fully closed positions F _CL and S _CL that respectively close the upper outlet 2 and the lower outlet passage 14 when the operation is stopped. The horizontal flap 11 and the shutter member 15 are opened at almost the same time as the start-up operation of the lower fan 8 up to each target rotation speed (about 1000 to 1400 rpm).

At this time, while the opening between the horizontal flap 11 and the shutter member 15 is small, the upper fan 7 and the lower fan 8
When the speed rises to the target speed, noise is generated. Therefore, for the upper fan 7, until the horizontal flap 11 reaches the limit release position F _VI set in advance between the fully closed position F _CL and the fully open position F _OP, and for the lower fan 8, the shutter until member 15 reaches the fully open position S _OP set as respective airflow restriction period, during which, holds the rotational speed of both the fan 7 and 8 at a low rotational speed (about 500～650Rpm, hereinafter referred to as the air volume limit rotational speed) It is supposed to.

[0006] Incidentally, rotation stroke up shutter member 15 reaches the fully open position S _OP from the fully closed position S _CL, rather than the stroke up to the horizontal flap 11 reaches the restriction release position F _VI from the fully closed position F _CL Because big, lower fan 8
Release occurs later than for the upper fan 7. And, conventionally, when the horizontal flap 11 has reached the above-mentioned restriction release position F _VI, to initiate the speed increasing from the upper fan 7 definitive air volume limit engine speed to the target rotational speed, then,
When the shutter member 15 reaches the fully open position _SOP , the lower fan 8 starts to increase the speed from the air volume limit rotation speed to the target rotation speed.

[0007]

However, as described above, the speed increase of each of the fans 7 and 8 from the air flow limit rotation speed to the target rotation speed is performed every time the air flow limit of the upper fan 7 and the lower fan 8 is released. However, if the sound is started independently, a problem arises in which an unpleasant sound such as a rustling sound (hereinafter referred to as a rustling sound) is generated.

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above problems, and has as its object to provide a fan control device for an air conditioner that can start each fan to a target rotation speed while suppressing the generation of rustling noise. It is in.

[0009]

According to a first aspect of the present invention, there is provided a fan control device for an air conditioner, wherein an inlet 4 and a plurality of outlets 2 are formed in a main body casing 1 of an indoor unit. In each of the outlet passages 10 and 14 extending from the space behind the heat exchanger 6 located along the inlet 4 to the outlets 2 and 3, respectively, the air flow restriction period maintained at a predetermined low-speed rotation state after startup. A fan control device for an air conditioner provided with indoor fans 7.8, each of which is accelerated to a target rotational speed through the air conditioner, when increasing the speed of each indoor fan 7.8 from a low-speed rotation state to a target rotational speed. So that the speed increase of the indoor fan 7 from which the air flow restriction has been released earlier occurs substantially in parallel with the indoor fan 8 whose air flow restriction has been released and the acceleration has started later.
It is characterized in that a start-up control means is provided for starting the speed increase of the indoor fan 7 from which the restriction on the air volume has been released earlier than the time when the restriction on the air volume for the indoor fan 7 is released.

[0010] The above-mentioned rumbling sound is generated by each indoor fan 7.
Occurs when the ratio of the amount of air passing through 8 greatly changes. For example, if the speed increase of the other indoor fan 8 is started after one indoor fan 7 has already reached the target rotation speed, the rotation speed ratio is large at the beginning of the speed increase, and
Therefore, the air volume ratio is large, and from this state,
The air volume ratio gradually decreases as the rotation speed of the other indoor fan 8 increases. As described above, when the air volume ratio largely changes, a rustling sound is generated.

Therefore, if there is a difference in releasing each air volume restriction when the indoor fans 7 and 8 are simultaneously started up, the indoor fan 7 whose air volume restriction has been released first must start increasing its speed. Rather than at the time of releasing the air volume restriction, the speed of the indoor fan 8 from which the air volume restriction is released is approached at the time of starting the speed increase, and each of the indoor fans 7 accompanying the speed increase of the fan
By causing the increase of the passing air volume at 8 in parallel with each other, it is possible to prevent a large change in the air volume ratio at this time. This makes it possible to raise each of the fans 7 and 8 to the target rotation speed without generating a rattling sound.

An air conditioner fan control device according to a second aspect of the present invention is an opening / closing member for opening and closing the flow passages in each of the blowout flow passages.
1 and 15 are provided, and a period from the closing position of each of the opening and closing members 11 and 15 to a predetermined opening degree is set as the air volume restriction period.

That is, as in the case of the horizontal flap and the shutter member described above, when the air-conditioning operation is stopped, the air flow path 10
In the air conditioner provided with the opening and closing members 11 and 15 for closing the opening 14, even if the indoor fans 7 and 8 are started almost simultaneously with the opening operation of the opening and closing members 11 and 15,
By keeping each of the indoor fans 7, 8 at a low rotation speed state, the noise generation at the time of starting is prevented by setting the indoor fan 7.8 at a low rotation speed state until the 15 reaches a predetermined opening degree. Since the generation of rustling noise when raising each of the indoor fans 7 and 8 up to a certain number can be suppressed, it is possible to perform startup without generating noise throughout.

According to a third aspect of the present invention, in the fan control device for an air conditioner, the start-up control means increases the speed of each of the indoor fans 7 and 8 from a low-speed rotation state to a target rotation speed.
· It is characterized in that it is started when all the air volume restrictions on 8 are released.

According to this, particularly when the rotational speeds of the indoor fans 7.8 are substantially the same as each other, when all of the air volume restrictions on the indoor fans 7.8 are released, each indoor fan 7.8 can be used. Since the speed increase is started at the same time, the speed at which the air volume increases is the same for each of the indoor fans 7, 8, and therefore, it is possible to increase the air speed ratio to the target rotation speed with almost no change in the air volume ratio. The generation of rustling noise is more reliably prevented.

[0016]

Next, an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 2 shows a floor-mounted indoor unit of the air conditioner according to this embodiment. A main casing 1 having a substantially rectangular cross section in the indoor unit is provided with an upper outlet 2 on an upper front side thereof and a lower outlet 3 on a lower front side thereof. A front grille 5 having an inlet 4 is mounted between the two outlets 2 and 3.

A heat exchange functioning as a condenser (during a heating operation) or an evaporator (during a cooling operation) in the refrigerant circuit is provided in the main body casing 1 at a position close to the front grille 5 from the rear side (right side in the figure). The vessel 6 is erected. The width direction of the main body casing 1 (the direction perpendicular to the plane of the paper) is provided on the upper end side and the lower end side behind the heat exchanger 6, respectively.
Upper indoor fan 7 and lower indoor fan 8 (hereinafter referred to as upper fan 7
The lower fan 8 is abbreviated.

Although not shown, a fan motor is directly coaxially connected to each of the fans 7, 8 on the front side of the drawing, and an electrical component box is arranged between the fan motors. An indoor control device including a microcomputer is housed in the electrical component box, and the fan 7 is controlled by the indoor control device as described later.
-The drive of 8 is controlled.

An upper scroll portion 1a is provided on the rear frame portion of the main casing 1 so as to smoothly curve upward from the rear region of the upper fan 7 to the front side and to reach the upper edge of the upper outlet 2. Below the front side of the upper scroll portion 1a, an upper partition plate 9 extending from a position close to and obliquely above the front side of the outer periphery of the upper fan 8 and beyond the heat exchanger 6 to the lower edge of the upper air outlet 2 is provided. Is provided.
Between the upper partition plate 9 and the upper scroll portion 1a, an upper outlet flow path 10 that is inclined from the upper fan 7 to the upper outlet 2 is formed.

The upper outlet 2 is provided with a horizontal flap 11 as a wind direction deflecting plate. This horizontal flap 1
1 is rotatably supported in the vicinity of the center in the plate width direction, and when the air-conditioning operation is stopped, the horizontal flap 11 is in a fully closed position F _CL where the upper outlet 2 is closed as shown by a solid line in the figure.
Is held. When the air-conditioning operation starts, the fully closed position F
From _CL, the half-open position shown in the figure F _VI (hereinafter, referred to as restriction release position) via, is rotated to a fully open position _OP along the flow direction of the top discharge flow path 10. Therefore, the horizontal flap 11 has a function as an opening / closing member that opens and closes the upper outlet passage 10. Incidentally, with respect to the horizontal flap 11, during air conditioning operation, it is also possible to user a position inclined to moderately vertically from the fully open position F _OP selects, thereby blowing the air-conditioned air through the upper outlet 2 The direction is adjusted up and down. Further, when the user specifies a swing operation, the horizontal flap 11 swings in a predetermined angle range around the fully open position _FOP .

Further, in producing the opening operation toward the fully closed position F _CL horizontal flap 11 is at the start of operation to the full open position F _OP, when the limit is reached the release position F _VI described above, a limit switch or the like (not shown) An airflow restriction release signal for the upper fan 7, which will be described later, is input to the indoor control device by the horizontal flap position detection sensor.

On the other hand, a lower scroll portion 1b which is smoothly curved from the rear area of the lower fan 8 to the front lower side is formed on the lower side of the rear frame portion of the main body casing 1. At the front end of the lower scroll portion 1b, a lower partition plate 12 reaching the lower edge of the lower outlet 3 is provided. Above the lower partition plate 12, the heat exchanger 6
A drain pan 13 is provided for receiving drain water generated and flowing down at the bottom wall 13 of the drain pan 13.
“a” is formed in a horizontal plate shape that reaches the upper edge of the lower outlet 3 from a position close to the outer periphery of the lower fan 8 obliquely downward on the front side. The lower fan 8 is disposed between the bottom wall 13a and the lower scroll portion 1b and the lower partition plate 12 described above.
A lower outlet passage 14 communicating with the lower outlet 3 is formed.

In the lower outlet passage 14, the passage 1
Shutter member (opening / closing member) 1 composed of a plate for opening and closing 4
5 are provided. The shutter member 15 is fully closed position S _CL and is pivotally supported at one end so as to be rotatable between a fully open position S _OP shown by a two-dot chain line, fully closed during air-conditioning operation is stopped as indicated by a solid line in FIG It is held at the position S _CL . Further, at the time of air conditioning operation, when the user specifies the upper and lower blowing mode described later, and opens the lower outlet passage 14 moves into the fully open position S _OP from the fully closed position S _CL. Further, when this opening operation occurs, when the full opening position _SOP is reached, a later-described airflow restriction release signal for the lower fan 8 is input to the indoor control device from a shutter member position detection sensor including a limit switch (not shown). It has become so.

In the air conditioner having the above-described structure, only the upper fan 7 is driven to blow conditioned air from the upper outlet 2 into the room, and the upper and lower fans 7.8 are driven to drive the upper fan. The user selects the up-down blowing mode in which the conditioned air is blown out from both the outlet 2 and the lower outlet 3, and the air-conditioning operation is performed. For example, when the operation is started in the upper blowing mode, the compressor in the outdoor unit (not shown) is started, and then the horizontal flap 11 is moved from the fully closed position _FCL to the fully opened position FCL.
_The operation of opening to the _OP is started, and the upper fan 7 is started.

At this time, the upper fan 7 sets the target rotation speed (1) according to the user-specified, for example, strong / medium / weak air volume setting.
(About 000 to 1300 rpm). In this process, reaches the air volume limit rotational speed rpm is preset above the fan 7 (e.g. 550 rpm), then until the horizontal flap 11 reaches the restriction release position F _VI, held in air volume limit rotation speed as described above Is done. And
When the horizontal flap 11 reaches the restriction release position F _VI and a restriction release signal is input from the horizontal flap position detection sensor to the indoor control device, the air flow restriction is released, and at this time, the air flow restriction rotation speed of the upper fan 7 is reduced. The speed increase up to the target rotation speed is started.

That is, until the horizontal flap 11 reaches the restriction release position _FVI , the area of the blow-out passage at this portion is small, and if the rotation speed of the upper fan 7 exceeds the speed corresponding to this passage area, noise is generated. Occur. For this reason, as described above, by providing the air flow restriction period in which the rotation speed is maintained at a low rotation speed until the horizontal flap 11 reaches the predetermined restriction release position F _VI , noise generation is prevented and the start-up of the fan 7 is started. Is performed.

When the upper fan 7 is driven in this manner, room air is sucked into the main body casing 1 through the suction port 4, and the drawn room air passes through the heat exchanger 6.
In the heating operation in which the heat exchanger 6 functions as a condenser of the refrigerant circuit, the heat exchanger 6 is heated, and in the cooling operation in which the heat exchanger 6 functions as an evaporator, it is cooled to be conditioned air. This is sucked by the upper fan 7 from the space behind the heat exchanger 6 and then sent to the upper outlet 2 through the upper outlet channel 10,
The air is blown into the room from the upper outlet 2 in a direction along the inclination direction of the horizontal flap 11.

On the other hand, particularly in the case of the heating operation, if the above-described up-down blowing mode is designated, the warm air is blown out from the lower outlet 3 even along the floor surface, thereby improving the immediate warming performance in the room. I do. When the heating operation is started by specifying such a vertical blowing mode, the compressor in the outdoor unit is started in the same manner as described above, and then, simultaneously with the start-up operation of the upper fan 7, the lower fan 8 It can be started up to the rotation speed.

The air volume for launch of the lower fan 8 until the shutter member 15 reaches the fully open position S _OP from the fully closed position S _CL and airflow restriction period, during which the rotational speed of the lower fan 8 which is set in advance Limit rotation speed (for example, 640 rpm
m). Then, when the shutter member 15 reaches the fully open position _SOP and the above-described airflow limit release signal is input to the indoor control device, the speed is increased from the airflow limit rotation speed to the target rotation speed (for example, about 1400 rpm). Details at the time of startup will be described later.

In the heating operation performed by driving both the fans 7 and 8 in this manner, the room air sucked into the main body casing 1 through the suction port 4 passes through the heat exchanger 6 and is heated. After the air becomes the conditioned air, the air is diverted up and down into a flow toward the upper fan 7 and a flow toward the lower fan 8 behind the heat exchanger 6. Through the upper outlet passage 10 to the upper outlet 2
From the room. On the other hand, the lower-side conditioned air sucked by the lower fan 8 is blown out substantially horizontally along the floor from the lower outlet 3 through the lower outlet passage 14 into the room.

In the present embodiment, each of the upper and lower fans 7 and 8 is constituted by a cross flow fan having substantially the same blowing capacity. When driven at the rotational speed, the air flows vertically through the fans 7 and 8 behind the heat exchanger 6 so as to diverge up and down to substantially the same air flow. The air volume ratio at this time is approximately 10:10. If the above-mentioned air volume ratio transiently changes to, for example, about 10: 7 when the fans 7 and 8 are raised from the air volume limited rotation speed to the target rotation speed, the above-mentioned rumbling sound is generated. I was

Therefore, in this embodiment, the whole air-conditioning operation is controlled while the indoor control device monitors an operation start signal, an operation mode switching signal, a room temperature detection signal, and the like from a remote controller operated by a user. Apart from the air-conditioning operation control unit, a fan start-up control unit (start-up control means) having a control function of raising both the upper and lower fans 7.8 to the target rotation speed without generating the above-mentioned humming noise is provided. Hereinafter, a specific control procedure in the start-up control unit will be described with reference to a control flowchart of FIG.

First, an example in which the air-conditioning operation is started in the above-described vertical blowing mode will be described. At the start of the air-conditioning operation, a start-up command for the upper fan 7 and the lower fan 8 is input from the air-conditioning operation control unit to the fan start-up control unit.

In this fan start-up control section, first, it is determined in step S1 that the above-mentioned start-up command for the upper fan 7 has been issued, and then in step S2
In the above, whether or not the upper fan 7 is in the air volume restriction state, that is, as described above, the horizontal flap 11 at which the opening operation is started almost simultaneously with the activation of the upper fan 7 is moved to the restriction release position F
_It is determined whether _VI has been reached. Immediately after the startup, the airflow is limited before the horizontal flap 11 reaches the restriction release position _FVI . Therefore, in this case, in step S3, the upper fan 7 is set to the airflow limited rotation speed, that is, this process is performed. The number of revolutions of the upper fan 7 is increased to the air volume limit rotation speed, and if the air volume limit rotation speed has already been reached, a process of maintaining the rotation speed is performed.

Next, in step S4, the lower fan 8
Therefore, it is determined that the start-up command has been issued also in step S5. In step S5, it is determined whether the lower fan 8 is in the air volume restriction state, that is, whether the shutter member 15 has reached the fully open position _SOP . No is determined. Immediately after startup,
In this case as well, the air flow is limited before the shutter member 15 reaches the fully open position _SOP . Therefore, the lower fan 8 is also subjected to the processing of setting the air flow limited rotation speed in step S6. Move to S1.

Therefore, the subsequent steps S1 and S4
In step S2 or S5, while confirming that the start-up command for the upper fan 7 and the lower fan 8 is continuously generated, the release of one of the air volume restrictions for the upper fan 7 and the lower fan 8 is performed. Until the determination is made, the processes of steps S3 and S6 are repeated, and the process of setting the upper and lower fans 7, 8 to the respective air volume limit rotation speeds is continued.

[0038] the duration of such processing, e.g., airflow limitation to the upper fan 7 is released horizontal flap 11 reaches the restriction release position F _VI, when it is determined in step S2, steps S2 S7 Transition. In this step S7, after confirming that the lower fan 8 is also operating simultaneously during startup, it is determined in step S8 whether or not the lower fan 8 is in the air flow restriction state. Until the restriction is also released, step S9
In, the process of setting the upper and lower fans 7.8 to each of the air volume limit rotation speeds is continued, and the process returns to step S8.

[0039] Then, the shutter member 15 reaches the fully open position S _OP, when that is released even airflow restriction with respect to the lower fan 8 is determined in step S8, the step S8
Then, the process proceeds from S10 to S10, in which the upper and lower fans 7.8 are raised from the respective air volume limit rotation speeds to the respective target rotation speeds, and the start-up of these fans 7.8 ends. At this point, the input state of the previous start command signal to the fan start control unit is stopped, and thereafter, the process returns to step S1 from step S10 to repeat the steps S1 and S4, that is, a new start. Waits for command input.

On the other hand, in the above description, the case in which the release of the air volume restriction is released before the upper fan 7 than the lower fan 8 has been described. Is released earlier than the upper fan 7, this is determined in step S5,
The process moves from step S5 to S11. In this step S11, after confirming that the upper fan 7 is also in the simultaneous operation during startup, it is determined in step S12 whether or not the upper fan 7 is in the air flow restriction state. Step S1 until the restriction is released.
In 3, the process of setting the upper and lower fans 7 and 8 to the respective air volume limit rotation speeds is continued. Then, when it is determined in step S12 that the air volume restriction on the upper fan 7 has also been released,
The process proceeds from step S12 to step S10,
At this time, the process of raising the upper and lower fans 7, 8 from the respective air volume limit rotation speeds to the respective target rotation speeds is performed, and the startup is completed.

When the air conditioning operation is started in the above-described upper blowing mode, only a start-up command for the upper fan 7 is issued. At this time, after the startup, the processes in steps S1 to S3 are performed in the same manner as described above, and then, since no startup command has been issued to the lower fan 8, the process returns from step S4 to S1 is performed. The process of setting the air volume limit rotation speed is continued. Then, when the horizontal flap 11 is opened to the restriction release position _FVI and the air volume restriction is released, the process proceeds from step S2 to step S7 in the same manner as described above. In this step, since it is determined that the start-up command for the lower fan 8 has not been issued, next, in step S14, the upper fan 7
Is increased to the target rotational speed, and the start-up operation at this time is terminated.

After the air-conditioning operation is started in the upper blowing mode, before the air volume restriction on the upper fan 7 is released,
In the case where the switching to the up-down blowing mode is performed by the user, the occurrence of a start-up command for the lower fan 8 is newly determined in step S4 during the repetition of steps S1 to S4. S4 to S6
And the process is switched to the control procedure for the simultaneous operation described above.

On the other hand, for example, when the air-conditioning operation is continued in the upper blowing mode, and the upper fan 7 is driven at the target speed, the user switches to the upper and lower blowing mode. Only a start command for the lower fan 8 is newly generated. At this time, first, the processes of steps S1 and S4 to S6 are repeated, and the rotation speed of the lower fan 8 is raised to and held at the air flow limit rotation speed. Then, when the shutter member 15 is opened to the fully open position _SOP and the air volume restriction is released, the process proceeds from step S5 to step S11, and in this step, the upper fan 7
It is determined that no start-up instruction has been issued for the lower fan 8. Next, in step S15, a process of raising the lower fan 8 to the target rotational speed is performed, and the start-up operation at this time ends.

FIG. 1 shows that the upper fan 7 is controlled by the above control.
7 shows a change in the rotation speed when the lower fan 8 and the lower fan 8 are simultaneously started. FIG. 5A shows control at the start of the air conditioning operation, in which the upper fan 7 and the lower fan 8 are started almost simultaneously,
Each of them immediately reaches the air volume limit rotation speed R _cU · R _cL and is held at these rotation speeds. Then, from the start, time to horizontal flap 11 with respect to the upper fan 7 reaches the restriction release position F _VI, the period until the shutter member 15 reaches the fully open position S _OP for lower fan 8, Each is set as the air volume restriction period. However, since the rotation stroke until the horizontal flap 11 reaches the restriction release position F _VI is smaller than the rotation stroke of the shutter member 15, the air flow to the upper fan 7 is normally Restrictions are lifted first. However, even if the air flow restriction on the upper fan 7 is released, the upper fan 7 is maintained at the air flow restriction rotation speed _RcU , and thereafter, when the air flow restriction on the lower fan 8 is also released, the upper fan 7 The lower fan 8 is controlled so as to simultaneously increase from the respective air volume limit rotation speeds R _cU and R _cL to the respective target rotation speeds R _tU and R _tL .

FIG. 3A shows that the upper fan 7 is controlled to rotate at the air flow rate limit R
Conventional control for increasing from _cU to the target rotation speed R _tU is indicated by a two-dot chain line arrow. At this time, during the period indicated by diagonal lines, the above-mentioned rustling sound was generated.

That is, in the case of the conventional control, the rotation speed of the upper fan 7 is increased first, so that, for example, when the air flow restriction on the lower fan 8 is released, the air flow passing through each fan 7.8 The ratio is as large as about 10: 6. At this time, the flow of air in the space behind the heat exchanger 6 is
According to the above-mentioned air volume ratio, most of the area except the lower side is a flow area toward the upper fan 7 side. Then, as the rotation speed of the lower fan 8 increases from this point, the air volume ratio becomes the ratio of the target rotation speeds R _tU and R _tL (for example, 10: 1).
0). That is, with the change in the air volume ratio in which the ratio toward the lower fan 8 side increases, behind the heat exchanger 6, the flow area that has been facing the upper fan 7 side at the center height area, The flow changes toward the flow region toward the fan 8, and the upper and lower branch lines move upward. As described above, mutual interference such as a change in the dividing boundary line occurs, and the flow passage area of the air particularly toward the upper fan 7 decreases. At this time, an increase in the amount of suction air into the upper fan 7 in accordance with an increase in the number of revolutions of the upper fan 7 does not occur smoothly. A sound is generated.

Therefore, in the present embodiment, the start of the speed increase from the air flow limit rotation speed R _cU of the upper fan 7 is delayed from the release of the air flow restriction to the upper fan 7 to the release of the air flow restriction to the lower fan 8. The speed increase is started simultaneously with the fan 8. As a result, each fan 7
8 increase in parallel with each other, and these fans 7
The air flow ratio increasing through 8 is kept substantially constant, and reaches the respective target rotation speeds R _tU and R _tL . In this process, a change in the position of the branch line in accordance with the air volume ratio behind the heat exchanger 6 is suppressed, and therefore, the flow path area for the up and down flows does not change, and the flow rate in each of these flow paths is reduced. Only by increasing, a stable shunt state is maintained without causing fluctuation due to mutual interference. As a result, the pressure state in each of the fans 7 and 8 is also stabilized, and as a result, each target rotation speed R _tU.
R _tL can be increased.

FIG. 1 (b) shows a change in the number of revolutions when switching from thermo OFF to thermo ON during the heating operation in the vertical blowing mode. At the time of the thermo-OFF, the horizontal flap 11 is held at the full open position F _OP , but for the upper fan 7, the thermo-OFF period is the air flow restriction period, and therefore, the air flow restriction rotation speed R _{cU is not exceeded.} The number of revolutions is reduced, and the blown air-conditioned air into the room is maintained in a state where it is suppressed. On the other hand, the lower fan 8 stops its rotation, and the shutter member 15
Is held at the fully closed position _SCL .

When the thermo switch is turned on in this state, a start-up command is issued to the upper and lower fans 7 and 8. At this time,
For upper fan 7, already exceeds the limit release position F _VI horizontal flap 11, also the switching of the thermo-ON,
The air flow restriction by the thermo ON / OFF is also released. Launch of this time, in FIG. 4, made from step S1 · S2 to the processing through the S7, then repeat steps S8 · S9, the shutter member 15 reaches the fully open position S _OP from the fully closed position S _CL, When the restriction on the air volume of the lower fan 8 is released, the process proceeds from step S8 to S10, and the upper and lower fans _7.8 are simultaneously _driven at the respective target rotational speeds R _tU and R _tL.
The operation of raising the height to the maximum is started.

Therefore, also in this case, as shown in FIG.
Control is performed so as to delay from the time of N to the time of releasing the air flow restriction on the lower fan 8, and the speed increase from the air flow restriction rotation speeds R _cU and R _{cL in} the upper fan 7 and the lower fan 8 is started simultaneously. Thus, also in this case, the same way without causing be dry sound, it is possible to increase both the fan 7 and 8 to each target rotational speed R _{tU-R tL.}

Although the specific embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and can be variously modified within the scope of the present invention. For example, in the above description, an example is shown in which the speed increase of the upper fan 7 is delayed until the air flow restriction of the lower fan 8 is released, thereby simultaneously increasing the speeds of the upper fan 7 and the lower fan 8. However, in the scope of claims 1 and 2 of the present invention, if the change in the air volume ratio falls within a predetermined range that does not cause rustling noise, the speed increase of the upper fan 7 is reduced to the lower fan 8.
It is also possible to have a configuration in which it is started slightly earlier than when the air volume restriction is released. In this case, for example, the lower fan 8
It is possible to roughly calculate the time required from the start of the operation to the release of the air volume restriction, and to increase the speed of the upper fan 7 when a predetermined time elapses from the start of the lower fan 8.

[0052] In the above embodiment, with respect to the upper fan 7, an example in which the to the horizontal flap 11 reaches the restriction release position F _VI and airflow restriction period, for example, a heat exchanger at the air-conditioning operation start 6 The present invention can also be applied to an air conditioner in which the air flow after the passage of the air reaches a predetermined temperature is defined as an air volume restriction period. Also, in the above,
An indoor unit of a floor-mounted air conditioner having upper and lower outlets 2 and 3 and two indoor fans, an upper fan 7 and a lower fan 8, has been described as an example. However, more outlets and indoor fans are required. The present invention can be applied to an air conditioner provided and configured.

[0053]

As described above, in the air conditioner fan control device according to the first aspect of the present invention, when increasing the speed of each indoor fan from the low-speed rotation state to the target rotation speed, the air volume restriction is released first. The start of the speed increase of the indoor fan is delayed later than the time when the air flow restriction for the indoor fan is released, and the speed is increased to the target rotation speed substantially in parallel with the indoor fan from which the air flow restriction is released later. In the process of increasing the speed, it is possible to suppress a large change in the passing air volume ratio of each indoor fan, and thereby, without generating a rustling sound,
Each fan can be raised to the target rotation speed.

In the fan control device for an air conditioner according to the second aspect, a period until the opening / closing member for opening / closing the outlet passage reaches a predetermined opening degree when the air conditioning operation is stopped is set as the air volume restriction period. Even if each indoor fan is started almost simultaneously with the opening operation of these opening / closing members, each indoor fan is held at a low rotation speed state until the opening / closing member reaches a predetermined opening degree, thereby preventing generation of noise at startup. In addition, since the occurrence of rustling noise when each indoor fan is raised from the low rotation speed state to the target rotation speed thereafter is also suppressed, noise-free startup can be performed throughout.

In the air conditioner fan control device according to the third aspect, the speed increase from the low speed rotation state of each indoor fan to the target rotation speed is started simultaneously when all the air volume restrictions on each indoor fan are released. Is controlled as
In particular, when the rotation speed increasing speeds of the indoor fans are substantially the same as each other, the increasing speed of the air volume is also substantially the same for each of the indoor fans, and therefore, the air flow ratio is increased to the target rotation speed with almost no change in the air volume ratio. Therefore, it is possible to more reliably prevent the generation of a rustling sound.

[Brief description of the drawings]

FIG. 1 shows an example of control performed by a fan control device for an air conditioner according to an embodiment of the present invention. FIG. 1 (a) shows that an upper fan and a lower fan are started simultaneously when an air conditioning operation is started. FIG. 4B is a time chart showing a change in the number of rotations of each fan when the fan is turned off.
6 is a time chart showing a change in the number of rotations of an upper fan and a lower fan when switching to N.

FIG. 2 is a perspective view showing an indoor unit of the air conditioner.

FIG. 3 is a longitudinal sectional view showing a configuration of the indoor unit.

FIG. 4 is a flowchart showing a specific control procedure in a fan start-up control unit in the fan control device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body casing 2 Upper outlet 3 Lower outlet 4 Inlet 6 Heat exchanger 7 Upper fan (indoor fan) 8 Lower fan (indoor fan) 10 Upper outlet channel 11 Horizontal flap (opening / closing member) 14 Lower outlet channel 15 Shutter member (opening / closing member)

Continuation of the front page (72) Inventor Atsushi Matsubara 1000-2 Oya, Okamotocho, Kusatsu-shi, Shiga Daikin Industries, Ltd. Shiga Works (56) References JP-A-4-240340 (JP, A) JP-A-61 -79933 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) F24F 11/04 F24F 11/02 102 F24F 11/047 F24F 11/053

Claims (3)

(57) [Claims] An inlet (4) and a plurality of outlets (2) (3) are formed in a main body casing (1) of an indoor unit,
From the space behind the heat exchanger (6) located along the suction port (4) in the main body casing (1), each outlet (2)
In each of the outlet flow paths (10) and (14) leading to (3),
After startup, an indoor fan (7) whose speed is increased to a target rotation speed through a flow rate restriction period maintained in a predetermined low-speed rotation state
An air conditioner fan control device provided with (8), wherein when increasing the speed of each of the indoor fans (7) and (8) from the low-speed rotation state to the target rotation speed, the indoor air flow restriction is released first. The indoor fan (7) whose air volume restriction has been released first is removed from the indoor fan (7) so that the speed increase of the fan (7) occurs almost in parallel with the indoor fan (8) whose air volume restriction is later released and acceleration is started. (7) A fan control device for an air conditioner, comprising start-up control means for starting the acceleration after delaying from the release of the air volume restriction. 2. Opening and closing members (11) and (15) for opening and closing the flow passages are provided in each of the outlet flow passages (10) and (14), respectively, and each of the opening and closing members (11) and (15) has a predetermined opening degree from a closed position. 2. The fan control device for an air conditioner according to claim 1, wherein a period until the airflow reaches the airflow limit period is set. 3. The start-up control means releases all air volume restrictions on the indoor fans (7) and (8) from increasing the speed of each of the indoor fans (7) and (8) from a low speed state to a target rotation speed. 2. The method according to claim 1, wherein the processing is started when the operation is performed.
Or the fan control device of the air conditioner of 2.